|
|
call loadScript javascripts\jsmol\core\package.js call loadScript javascripts\jsmol\core\core.z.js -- required by ClazzNode call loadScript javascripts\jsmol\J\awtjs2d\WebOutputChannel.js Jmol JavaScript applet jmolApplet0_object__224941541251618__ initializing getValue debug = null getValue logLevel = null getValue allowjavascript = null AppletRegistry.checkIn(jmolApplet0_object__224941541251618__) call loadScript javascripts\jsmol\core\corestate.z.js viewerOptions: { "name":"jmolApplet0_object","applet":true,"documentBase":"https://www.ebi.ac.uk/chebi/searchId.do?chebiId=CHEBI:27304","platform":"J.awtjs2d.Platform","fullName":"jmolApplet0_object__224941541251618__","display":"jmolApplet0_canvas2d","signedApplet":"true","appletReadyCallback":"Jmol._readyCallback","statusListener":"[J.appletjs.Jmol.MyStatusListener object]","codeBase":"https://www.ebi.ac.uk/chebi/javascripts/jsmol/","syncId":"224941541251618","bgcolor":"#000" } (C) 2012 Jmol Development Jmol Version: 13.2.7 $Date: 2013-10-01 11:35:15 -0500 (Tue, 01 Oct 2013) $ java.vendor: j2s java.version: 0.0 os.name: j2s Access: ALL memory: 0.0/0.0 processors available: 1 useCommandThread: false appletId:jmolApplet0_object (signed) starting HoverWatcher_1 getValue emulate = null defaults = "Jmol" getValue boxbgcolor = null getValue bgcolor = #000 backgroundColor = "#000" getValue ANIMFRAMECallback = null getValue APPLETREADYCallback = Jmol._readyCallback APPLETREADYCallback = "Jmol._readyCallback" getValue ATOMMOVEDCallback = null getValue CLICKCallback = null getValue ECHOCallback = null getValue ERRORCallback = null getValue EVALCallback = null getValue HOVERCallback = null getValue LOADSTRUCTCallback = null getValue MEASURECallback = null getValue MESSAGECallback = null getValue MINIMIZATIONCallback = null getValue PICKCallback = null getValue RESIZECallback = null getValue SCRIPTCallback = null getValue SYNCCallback = null getValue STRUCTUREMODIFIEDCallback = null getValue doTranslate = null language=en_US getValue popupMenu = null getValue script = null Jmol applet jmolApplet0_object__224941541251618__ ready call loadScript javascripts\jsmol\core\corescript.z.js call loadScript javascripts\jsmol\J\script\FileLoadThread.js starting QueueThread0_2 script 1 started starting HoverWatcher_3 starting HoverWatcher_4 The Resolver thinks Mol Marvin 02060821293D starting HoverWatcher_5 Time for openFile( Marvin 02060821293D 21 22 0 0 0 0 999 V2000 0.5614 1.8131 -1.0401 C 0 0 0 0 0 0 0 0 0 0 0 0 2.2747 -0.4028 -0.8135 C 0 0 0 0 0 0 0 0 0 0 0 0 2.6967 0.7462 -1.5015 C 0 0 0 0 0 0 0 0 0 0 0 0 1.8412 1.8537 -1.6151 C 0 0 0 0 0 0 0 0 0 0 0 0 0.9891 -0.4628 -0.2275 C 0 0 0 0 0 0 0 0 0 0 0 0 0.1166 0.6642 -0.3423 C 0 0 0 0 0 0 0 0 0 0 0 0 -0.7081 -1.6070 1.0135 C 0 0 0 0 0 0 0 0 0 0 0 0 -1.1560 0.5871 0.2456 C 0 0 0 0 0 0 0 0 0 0 0 0 -1.9183 1.5452 0.1570 O 0 0 0 0 0 0 0 0 0 0 0 0 0.5405 -1.5960 0.4652 C 0 0 0 0 0 0 0 0 0 0 0 0 1.2394 -2.5943 0.5990 O 0 0 0 0 0 0 0 0 0 0 0 0 -1.5537 -0.5526 0.9189 C 0 0 0 0 0 0 0 0 0 0 0 0 -2.8783 -0.6171 1.5239 C 0 0 0 0 0 0 0 0 0 0 0 0 -0.0368 2.6380 -1.1418 H 0 0 0 0 0 0 0 0 0 0 0 0 2.9218 -1.1929 -0.7485 H 0 0 0 0 0 0 0 0 0 0 0 0 3.6284 0.7738 -1.9192 H 0 0 0 0 0 0 0 0 0 0 0 0 2.1467 2.6906 -2.1154 H 0 0 0 0 0 0 0 0 0 0 0 0 -0.9943 -2.4290 1.4989 H 0 0 0 0 0 0 0 0 0 0 0 0 -3.0976 -1.5580 2.0323 H 0 0 0 0 0 0 0 0 0 0 0 0 -3.6360 -0.4817 0.7489 H 0 0 0 0 0 0 0 0 0 0 0 0 -2.9774 0.1822 2.2616 H 0 0 0 0 0 0 0 0 0 0 0 0 1 6 4 0 0 0 0 1 4 4 0 0 0 0 5 2 4 0 0 0 0 2 3 4 0 0 0 0 3 4 4 0 0 0 0 10 5 1 0 0 0 0 6 5 4 0 0 0 0 8 6 1 0 0 0 0 8 12 1 0 0 0 0 12 7 2 0 0 0 0 7 10 1 0 0 0 0 8 9 2 0 0 0 0 10 11 2 0 0 0 0 12 13 1 0 0 0 0 1 14 1 0 0 0 0 2 15 1 0 0 0 0 3 16 1 0 0 0 0 4 17 1 0 0 0 0 7 18 1 0 0 0 0 13 19 1 0 0 0 0 13 20 1 0 0 0 0 13 21 1 0 0 0 0 M END): 22 ms reading 21 atoms ModelSet: haveSymmetry:false haveUnitcells:false haveFractionalCoord:false 1 model in this collection. Use getProperty "modelInfo" or getProperty "auxiliaryInfo" to inspect them. Default Van der Waals type for model set to Babel 21 atoms created ModelSet: not autobonding; use forceAutobond=true to force automatic bond creation Script completed Jmol script terminated
|
| Menadione is a synthetic organic compound with the formula C6H4(CO)2C2H(CH3). It is an analog of 1,4-naphthoquinone with a methyl group in the 2-position. It is sometimes called vitamin K3. Use is allowed as a nutritional supplement in animal feed because of its vitamin K activity. |
|
Read full article at Wikipedia
|
| InChI=1S/C11H8O2/c1-7-6-10(12)8-4-2-3-5-9(8)11(7)13/h2-6H,1H3 |
| MJVAVZPDRWSRRC-UHFFFAOYSA-N |
| CC1=CC(=O)C2=C(C=CC=C2)C1=O |
|
|
Homo sapiens
(NCBI:txid9606)
|
Found in
urine
(BTO:0001419).
See:
PubMed
|
|
human urinary metabolite
Any metabolite (endogenous or exogenous) found in human urine samples.
EC 3.4.22.69 (SARS coronavirus main proteinase) inhibitor
An EC 3.4.22.* (cysteine endopeptidase) inhibitor that interferes with the action of SARS coronavirus main proteinase (EC 3.4.22.69).
mouse metabolite
Any mammalian metabolite produced during a metabolic reaction in a mouse (Mus musculus).
(via vitamin K )
fat-soluble vitamin (role)
Any vitamin that dissolves in fats and are stored in body tissues. Unlike the water-soluble vitamins, they are stored in the body for long periods of time and generally pose a greater risk for toxicity when consumed in excess.
(via vitamin K )
|
|
|
angiogenesis inhibitor
An agent and endogenous substances that antagonize or inhibit the development of new blood vessels.
antineoplastic agent
A substance that inhibits or prevents the proliferation of neoplasms.
nutraceutical
A product in capsule, tablet or liquid form that provide essential nutrients, such as a vitamin, an essential mineral, a protein, an herb, or similar nutritional substance.
|
|
View more via ChEBI Ontology
|
2-methylnaphthalene-1,4-dione
|
|
2-methyl-1,4-naphthalenedione
|
ChemIDplus
|
2-Methyl-1,4-naphthochinon
|
ChemIDplus
|
|
2-methyl-1,4-naphthoquinone
|
KEGG COMPOUND
|
|
2-methylnaphthoquinone
|
ChemIDplus
|
|
3-methyl-1,4-naphthoquinone
|
ChemIDplus
|
|
menadion
|
ChemIDplus
|
|
Menadione
|
KEGG COMPOUND
|
|
MENADIONE
|
PDBeChem
|
|
menadione
|
UniProt
|
|
menaphthon
|
ChemIDplus
|
|
menaphthone
|
ChemIDplus
|
|
menaquinone
|
ChemIDplus
|
|
menaquinone 0
|
ChemIDplus
|
|
vitamin K3
|
ChemIDplus
|
|
vitamin K3
|
ChEBI
|
|
Aquakay
|
ChemIDplus
|
|
Aquinone
|
ChemIDplus
|
|
Hemodal
|
ChemIDplus
|
|
Kappaxin
|
KEGG DRUG
|
|
1683
|
DrugCentral
|
|
3915
|
ChemSpider
|
|
C05377
|
KEGG COMPOUND
|
|
CPD-3766
|
MetaCyc
|
|
D02335
|
KEGG DRUG
|
|
DB00170
|
DrugBank
|
|
FDB000953
|
FooDB
|
|
HMDB0001892
|
HMDB
|
|
LSM-3755
|
LINCS
|
|
Menadione
|
Wikipedia
|
|
VK3
|
PDBeChem
|
| View more database links |
|
1908453
|
Reaxys Registry Number
|
Reaxys
|
|
58-27-5
|
CAS Registry Number
|
KEGG COMPOUND
|
|
58-27-5
|
CAS Registry Number
|
ChemIDplus
|
|
58-27-5
|
CAS Registry Number
|
NIST Chemistry WebBook
|
Xin Y, Guo W, Yang C, Huang Q, Zhang P, Zhang L, Jiang G (2021)
Photodynamic Effects of Vitamin K3 on Cervical Carcinoma Cells Activating Mitochondrial Apoptosis Pathways.
Anti-cancer agents in medicinal chemistry 21, 91-99 [PubMed:32798378]
[show Abstract]
BackgroundPhotodynamic Therapy (PDT) is a photoactivation or photosensitization process, wherein vitamin K3 (Vit K3) serves as a photosensitizer to produce Reactive Oxygen Species (ROS) against bacteria at appropriate wavelengths. In this study, we used Vit K3 treatment combined with Ultraviolet radiation A (UVA) to produce photodynamic effects on cervical cancer.MethodsThe dose-concentration relationship between Vit K3 treatment and UVA on tumor cells was analyzed through the Cell Counting Kit-8 method. Then, the morphological characteristics of apoptosis cells were observed through fluorescent staining and fluorescence microscopy. Apoptosis after treatment with Vit K3 treatment, UVA, and Vit K3 treatment plus UVA was further observed through Western blot analysis, flow cytometry, and TUNEL assay. The xenograft models from HeLa cells were established for the exploration of the photodynamic effect of Vit K3 treatment on cervical cancer in vivo.ResultsVit K3 treatment plus UVA reduced tumor cell viability in a dose-dependent manner. Further studies indicated that Vit K3 treatment plus UVA can inhibit tumor growth and enhance the apoptosis of cervical cancer cells. In the combination group, the expression levels of cleaved caspase-3, cleaved caspase-9, B-cell lymphoma- extra large (Bcl-xl), and cytochrome c (cyt-c) increased obviously, whereas the expression level of Bcell lymphoma 2 (Bcl-2) decreased relative to the expression levels of UVA- or Vit K3-treated cells. In the in vivo experiments, tumor growth was inhibited significantly in the VitK3 treatment plus UVA group. Additionally, we demonstrated that the combination therapy mediated an increase in cleaved caspase-3 and cleaved caspase-9 expression and decrease in Bcl-2 expression in vivo.ConclusionOur results showed that Vit K3 treatment combined with UVA exerted photodynamic effects on cervical cancer cells by activating mitochondrial apoptosis pathways. | Bik E, Mateuszuk L, Stojak M, Chlopicki S, Baranska M, Majzner K (2021)
Menadione-induced endothelial inflammation detected by Raman spectroscopy.
Biochimica et biophysica acta. Molecular cell research 1868, 118911 [PubMed:33227312]
[show Abstract]
In this work, the effect of an early oxidative stress on human endothelial cells induced by menadione was studied using a combined methodology of label-free Raman imaging and fluorescence staining. Menadione-induced ROS-dependent endothelial inflammation in human aorta endothelial cells (HAEC) was studied with focus on changes in cytochrome, proteins, nucleic acids and lipids content and their distribution in cells. Fluorescence staining (ICAM-1, VCAM-1, vWF, LipidTox, MitoRos and DCF) was used to confirm endothelial inflammation and ROS generation. The results showed that short time, exposure to menadione did not cause their apoptosis or necrosis (Annexin V Apoptosis Detection Kit) within the 3 h timescale of measurement. On the other hand, 3 h of incubation, did result in endothelial inflammation (ICAM-1, VCAM-1, vWF) that was associated with an increased ROS formation (MitoRos and DCF) suggesting the oxidative stress-mediated inflammation. Chemometric analysis of spectral data enabled the determination of spectroscopic markers of menadione-induced oxidative stress-mediated endothelial inflammation including a decrease of the bands intensity of cytochrome (604, 750, 1128, 1315 and 1585 cm-1), nucleic acids bands (785 cm-1), proteins (1005 cm-1) and increased intensity of lipid bands (722, 1085, 1265, 1303, 1445 and 1660 cm-1), without changes in the spectroscopic signature of the cell nucleus. In conclusion, oxidative stress resulting in endothelial inflammation was featured by significant alterations in the number of biochemical changes in mitochondria and other cellular compartments detected by Raman spectroscopy. Most of these, coexisted with results from fluorescence imaging, and most importantly occurred earlier than the detection of increased ROS or markers of endothelial inflammation. | Funk MI, Conde MA, Piwien-Pilipuk G, Uranga RM (2021)
Novel antiadipogenic effect of menadione in 3T3-L1 cells.
Chemico-biological interactions 343, 109491 [PubMed:33945810]
[show Abstract]
Inhibition of adipocyte differentiation can be used as a strategy for preventing adipose tissue expansion and, consequently, for obesity management. Since reactive oxygen species (ROS) have emerged as key modulators of adipogenesis, the effect of menadione (a synthetic form of vitamin K known to induce the increase of intracellular ROS) on 3T3-L1 preadipocyte differentiation was studied. Menadione (15 μM) increased ROS and lipid peroxidation, generating mild oxidative stress without affecting cell viability. Menadione drastically inhibited adipogenesis, accompanied by decreased intracellular lipid accumulation and diminished expression of the lipo/adipogenic markers peroxisome proliferator-activated receptor (PPAR)γ, fatty acid synthase (FAS), CCAAT/enhancer-binding protein (C/EBP) α, fatty acid binding protein (FABP) 4, and perilipin. Menadione treatment also increased lipolysis, as indicated by augmented glycerol release and reinforced by the increased expression of hormone-sensitive lipase (HSL). Additionally, menadione increased the inhibitory phosphorylation of acetyl-CoA-carboxylase (ACC), which results in the inhibition of fatty acid synthesis. As a consequence, triglyceride content was decreased. Menadione also inhibited the phosphatidylinositol 3-kinase (PI3K)/Akt pathway. Further, treatment with increased concentration of insulin, a potent physiological activator of the PI3K/Akt pathway, rescued the normal level of expression of PPARγ, the master regulator of adipogenesis, and overcame the restraining effect of menadione on the differentiation capacity of 3T3-L1 preadipocytes. Our study reveals novel antiadipogenic action for menadione, which is, at least in part, mediated by the PI3K/Akt pathway signaling and raises its potential as a therapeutic agent in the treatment or prevention of adiposity. | Chhour M, Perio P, Gayon R, Ternet-Fontebasso H, Ferry G, Nepveu F, Boutin JA, Sudor J, Reybier K (2021)
Association of NQO2 With UDP-Glucuronosyltransferases Reduces Menadione Toxicity in Neuroblastoma Cells.
Frontiers in pharmacology 12, 660641 [PubMed:34040527]
[show Abstract]
The balance between detoxification and toxicity is linked to enzymes of the drug metabolism Phase I (cytochrome P450 or oxidoreductases) and phase II conjugating enzymes (such as the UGTs). After the reduction of quinones, the product of the reaction, the quinols-if not conjugated-re-oxidizes spontaneously to form the substrate quinone with the concomitant production of the toxic reactive oxygen species (ROS). Herein, we documented the modulation of the toxicity of the quinone menadione on a genetically modified neuroblastoma model cell line that expresses both the quinone oxidoreductase 2 (NQO2, E.C. 1.10.5.1) alone or together with the conjugation enzyme UDP-glucuronosyltransferase (UGT1A6, E.C. 2.4.1.17), one of the two UGT isoenzymes capable to conjugate menadione. As previously shown, NQO2 enzymatic activity is concomitant to massive ROS production, as previously shown. The quantification of ROS produced by the menadione metabolism was probed by electron-paramagnetic resonance (EPR) on cell homogenates, while the production of superoxide was measured by liquid chromatography coupled to mass spectrometry (LC-MS) on intact cells. In addition, the dysregulation of the redox homeostasis upon the cell exposure to menadione was studied by fluorescence measurements. Both EPR and LCMS studies confirmed a significant increase in the ROS production in the NQO2 overexpressing cells due to the fast reduction of quinone into quinol that can re-oxidize to form superoxide radicals. However, the effect of NQO2 inhibition was drastically different between cells overexpressing only NQO2 vs. both NQO2 and UGT. Whereas NQO2 inhibition decreases the amount of superoxide in the first case by decreasing the amount of quinol formed, it increased the toxicity of menadione in the cells co-expressing both enzymes. Moreover, for the cells co-expressing QR2 and UGT the homeostasis dysregulation was lower in presence of menadione than for the its counterpart expressing only QR2. Those results confirmed that the cooperation of the two enzymes plays a fundamental role during the cells' detoxification process. The fluorescence measurements of the variation of redox homeostasis of each cell line and the detection of a glucuronide form of menadiol in the cells co-expressing NQO2 and UGT1A6 enzymes further confirmed our findings. | Wang R, Hu Q, Wang H, Zhu G, Wang M, Zhang Q, Zhao Y, Li C, Zhang Y, Ge G, Chen H, Chen L (2021)
Identification of Vitamin K3 and its analogues as covalent inhibitors of SARS-CoV-2 3CLpro.
International journal of biological macromolecules 183, 182-192 [PubMed:33901557]
[show Abstract]
After the emergence of the pandemic, repurposed drugs have been considered as a quicker way of finding potential antiviral agents. SARS-CoV-2 3CLpro is essential for processing the viral polyproteins into mature non-structural proteins, making it an attractive target for developing antiviral agents. Here we show that Vitamin K3 screened from the FDA-Approved Drug Library containing an array of 1,018 compounds has potent inhibitory activity against SARS-CoV-2 3CLpro with the IC50 value of 4.78 ± 1.03 μM, rather than Vitamin K1, K2 and K4. Next, the time-dependent inhibitory experiment was carried out to confirm that Vitamin K3 could form the covalent bond with SARS-CoV-2 3CLpro. Then we analyzed the structure-activity relationship of Vitamin K3 analogues and identified 5,8-dihydroxy-1,4-naphthoquinone with 9.8 times higher inhibitory activity than Vitamin K3. Further mass spectrometric analysis and molecular docking study verified the covalent binding between Vitamin K3 or 5,8-dihydroxy-1,4-naphthoquinone and SARS-CoV-2 3CLpro. Thus, our findings provide valuable information for further optimization and design of novel inhibitors based on Vitamin K3 and its analogues, which may have the potential to fight against SARS-CoV-2. | Rozene J, Morkvenaite-Vilkonciene I, Bruzaite I, Zinovicius A, Ramanavicius A (2021)
Baker's Yeast-Based Microbial Fuel Cell Mediated by 2-Methyl-1,4-Naphthoquinone.
Membranes 11, 182 [PubMed:33800926]
[show Abstract]
Microbial fuel cell (MFC) efficiency depends on charge transfer capability from microbe to anode, and the application of suitable redox mediators is important in this area. In this study, yeast viability experiments were performed to determine the 2-methyl-1,4-naphthoquinone (menadione (MD)) influence on different yeast cell species (baker's yeast and Saccharomyces cerevisiae yeast cells). In addition, electrochemical measurements to investigate MFC performance and efficiency were carried out. This research revealed that baker's yeast cells were more resistant to dissolved MD, but the current density decreased when yeast solution concentration was incrementally increased in the same cell. The maximal calculated power of a designed baker's yeast-based MFC cell anode was 0.408 mW/m2 and this power output was registered at 24 mV. Simultaneously, the cell generated a 62-mV open circuit potential in the presence of 23 mM potassium ferricyanide and the absence of glucose and immobilized MD. The results only confirm that MD has strong potential to be applied to microbial fuel cells and that a two-redox-mediator-based system is suitable for application in microbial fuel cells. | Wellington KW, Hlatshwayo V, Kolesnikova NI, Saha ST, Kaur M, Motadi LR (2020)
Anticancer activities of vitamin K3 analogues.
Investigational new drugs 38, 378-391 [PubMed:31701430]
[show Abstract]
In a previous study we reported on the synthesis of 1,4-naphthoquinone-sulfides by thiolation of 1,4-naphthohydroquinones with primary aryl and alkyl thiols using laccase as catalyst. These compounds were synthesized as Vitamin K3 analogues. Vitamin K3 (VK3; 2-methyl-1,4-naphthoquinone; menadione) is known to have potent anticancer activity. This investigation reports on the anticancer activity of these VK3 analogues against TK10 renal, UACC62 melanoma, MCF7 breast, HeLa cervical, PC3 prostate and HepG2 liver cancer cell lines to evaluate their cytostatic effects. A 1,4-naphthohydroquinone derivative exhibited potent cytostatic effects (GI50 = 1.66-6.75 μM) which were better than that of etoposide and parthenolide against several of the cancer cell lines. This compound produces reactive oxygen species and disrupts the mitochondrial membrane potential in the MCF7 breast cancer cell line which is an indication that the cells undergo apoptosis. The 1,4-naphthoquinone sulfides also had potent cytostatic effects (GI50 = 2.82-9.79 μM) which were also better than that of etoposide, parthenolide and VK3 against several of the cancer cell lines. These compounds are generally more selective for cancer cells than for normal human lung fetal fibroblasts (WI-38). They also have moderate to weak cytostatic effects compared to etoposide, parthenolide and VK3 which have potent cytostatic effects against WI-38. One analogue induces apoptosis by activating caspases without arresting the cell cycle in the MCF7 breast cancer cell line. These results inspire further research for possible application in cancer chemotherapy. | Tintino SR, Souza VCA, Silva JMAD, Oliveira-Tintino CDM, Pereira PS, Leal-Balbino TC, Pereira-Neves A, Siqueira-Junior JP, da Costa JGM, Rodrigues FFG, Menezes IRA, da Hora GCA, Lima MCP, Coutinho HDM, Balbino VQ (2020)
Effect of Vitamin K3 Inhibiting the Function of NorA Efflux Pump and Its Gene Expression on Staphylococcus aureus.
Membranes 10, E130 [PubMed:32630491]
[show Abstract]
Resistance to antibiotics has made diseases that previously healed easily become more difficult to treat. Staphylococcus aureus is an important cause of hospital-acquired infections and multi-drug resistant. NorA efflux pump, present in bacteria S. aureus, is synthesized by the expression of the norA gene. Menadione, also known as vitamin K3, is one of the synthetic forms of vitamin K. Therefore, the aim of this study is to verify the menadione effect on efflux inhibition through NorA pump gene expression inhibition and assess the effects of menadione in bacterial membrane. The effect of menadione as an efflux pump inhibitor (EPI) was evaluated by the microdilution method, fluorimetry, electron microscopy, and by RT-qPCR to evaluate gene expression. In the molecular docking, association with menadione induces increased fluorescence intensity. Menadione was observed (100% of the clusters) interacting with residues ILE12, ILE15, PHE16, ILE19, PHE47, GLN51, ALA105, and MET109 from NorA. The results showed the norA gene had its expression significantly diminished in the presence of menadione. The simulation showed that several menadione molecules were able to go through the bilayer and allow the entry of water molecules into the hydrophobic regions of the bilayer. When present within membranes, menadione may have caused membrane structural changes resulting in a decline of the signaling pathways involved in norA expression. Menadione demonstrated to be an efflux pump inhibitor with dual mechanism: affecting the efflux pump by direct interaction with protein NorA and indirectly inhibiting the norA gene expression, possibly by affecting regulators present in the membrane altered by menadione. | Lencina AM, Koepke J, Preu J, Muenke C, Gennis RB, Michel H, Schurig-Briccio LA (2019)
Characterization and X-ray structure of the NADH-dependent coenzyme A disulfide reductase from Thermus thermophilus.
Biochimica et biophysica acta. Bioenergetics 1860, 148080 [PubMed:31520616]
[show Abstract]
The crystal structure of the enzyme previously characterized as a type-2 NADH:menaquinone oxidoreductase (NDH-2) from Thermus thermophilus has been solved at a resolution of 2.9 Å and revealed that this protein is, in fact, a coenzyme A-disulfide reductase (CoADR). Coenzyme A (CoASH) replaces glutathione as the major low molecular weight thiol in Thermus thermophilus and is maintained in the reduced state by this enzyme (CoADR). Although the enzyme does exhibit NADH:menadione oxidoreductase activity expected for NDH-2 enzymes, the specific activity with CoAD as an electron acceptor is about 5-fold higher than with menadione. Furthermore, the crystal structure contains coenzyme A covalently linked Cys44, a catalytic intermediate (Cys44-S-S-CoA) reduced by NADH via the FAD cofactor. Soaking the crystals with menadione shows that menadione can bind to a site near the redox active FAD, consistent with the observed NADH:menadione oxidoreductase activity. CoADRs from other species were also examined and shown to have measurable NADH:menadione oxidoreductase activity. Although a common feature of this family of enzymes, no biological relevance is proposed. The CoADR from T. thermophilus is a soluble homodimeric enzyme. Expression of the recombinant TtCoADR at high levels in E. coli results in a small fraction that co-purifies with the membrane fraction, which was used previously to isolate the enzyme wrongly identified as a membrane-bound NDH-2. It is concluded that T. thermophilus does not contain an authentic NDH-2 component in its aerobic respiratory chain. | Kishore C, Sundaram S, Karunagaran D (2019)
Vitamin K3 (menadione) suppresses epithelial-mesenchymal-transition and Wnt signaling pathway in human colorectal cancer cells.
Chemico-biological interactions 309, 108725 [PubMed:31238027]
[show Abstract]
Tumor recurrence and metastasis decrease the survival rate of colorectal cancer (CRC) patients. Menadione reduces the numbers and incidences of 1,2-dimethylhydrazine induced colon tumors in mouse but the mechanism of anticancer activity of menadione in colorectal cancer is not very clear. Since Wnt signaling is constitutively active in CRC and it aggravates the epithelial mesenchymal transition (EMT), the regulation of EMT and Wnt signaling by menadione (vitamin K3) was investigated in CRC cells. Menadione showed cytotoxicity against human CRC cells (SW480 and SW620) and human primary colon cancer cells but was relatively ineffective against the cells from human normal colon (CRL-1790) and human primary colon epithelial cells. Menadione suppressed invasion, migration and epithelial-mesenchymal transition in human CRC cells by upregulating the expression of E-cadherin (CDH1), ZO-1 and downregulating that of N-cadherin (CDH2), Vimentin (VIM), ZEB1, MMP2 and MMP9. Menadione decreased TOPFlash/FOPFlash luciferase activity and expression of several downstream targets of Wnt signaling and coactivators such as β-catenin (CTNNB1), TCF7L2, Bcl9l, p300 (EP300) and cyclin D1 (CCND1) was suppressed. Menadione induced differentiation and increased apoptotic cell population in SubG0 phase of cell cycle in SW480 and SW620 cells. The ability of menadione to suppress EMT, migration, invasion, Wnt signaling, cell proliferation and induce Sub G0 arrest, highlights its potential to be considered for intensive preclinical and clinical investigation in CRC. | Chatron N, Hammed A, Benoît E, Lattard V (2019)
Structural Insights into Phylloquinone (Vitamin K1), Menaquinone (MK4, MK7), and Menadione (Vitamin K3) Binding to VKORC1.
Nutrients 11, E67 [PubMed:30609653]
[show Abstract]
Vitamin K family molecules-phylloquinone (K1), menaquinone (K2), and menadione (K3)-act as γ-glutamyl carboxylase (GGCX)-exclusive cofactors in their hydroquinone state, activating proteins of main importance for blood coagulation in the liver and for arterial calcification prevention and energy metabolism in extrahepatic tissues. Once GGCX is activated, vitamin K is found in the epoxide state, which is then recycled to quinone and hydroquinone states by vitamin K epoxide reductase (VKORC1). Nevertheless, little information is available concerning vitamin K1, K2, or K3 tissue distribution and preferential interactions towards VKORC1. Here we present a molecular modeling study of vitamin K1, menaquinones 4, 7 (MK4, MK7), and K3 structural interactions with VKORC1. VKORC1 was shown to tightly bind vitamins K1 and MK4 in the epoxide and quinone states, but not in the hydroquinone state; five VKORC1 residues were identified as crucial for vitamin K stabilization, and two other ones were essential for hydrogen bond formation. However, vitamin MK7 revealed shaky binding towards VKORC1, induced by hydrophobic tail interactions with the membrane. Vitamin K3 exhibited the lowest affinity with VKORC1 because of the absence of a hydrophobic tail, preventing structural stabilization by the enzyme. Enzymatic activity towards vitamins K1, MK4, MK7, and K3 was also evaluated by in vitro assays, validating our in silico predictions: VKORC1 presented equivalent activities towards vitamins K1 and MK4, but much lower activity with respect to vitamin MK7, and no activity towards vitamin K3. Our results revealed VKORC1's ability to recycle both phylloquinone and some menaquinones, and also highlighted the importance of vitamin K's hydrophobic tail size and membrane interactions. | Xing G, Miller CJ, Ninh Pham A, Jones AM, Waite TD (2018)
Oxidant Generation Resulting from the Interaction of Copper with Menadione (Vitamin K3)-a Model for Metal-mediated Oxidant Generation in Living Systems.
Journal of inorganic biochemistry 188, 38-49 [PubMed:30119016]
[show Abstract]
The oxidation of hydroquinones is of interest both due to the generation of reactive oxygen species (ROS) and to the implications to trace metal redox state. Menadione (MNQ), a typical toxicant quinone used extensively for studying the mechanisms underlying oxidative stress, is known to be an effective source of exogenous ROS. In this study, the kinetics and mechanism of the oxidation of menadiol (MNH2Q, the reduced form of MNQ) in the absence and presence of copper (Cu) over the pH range 6.0-7.5 was examined. The autoxidation rate increased with increasing pH and concentration of O2 and also slightly increased with increasing concentration of MNH2Q and MNQ with Cu shown to play a significant role in catalysing the oxidation of MNH2Q. A kinetic model showed that the mono-deprotonated menadiol, MNHQ-, accounted for the pH dependence of the autoxidation rate. In this proposed mechanism, both MNH2Q and MNHQ- species were oxidized quickly by Cu(II), generating menadione semiquinone (MNSQ•-) and superoxide (O2•-) and the reduced form of Cu, Cu(I). Oxygen not only facilitated the catalytic role of Cu(II) by rapidly regenerating Cu(II) but also effectively removed MSNQ•-, generating the important chain-propagating species O2•-. The model demonstrated that Cu(I) was a significant sink of O2•- resulting in the generation of H2O2 with subsequent generation of highly oxidative intermediates including Cu(III). These results provide considerable insight into the clinical significance of the biological activation and detoxification of MNQ with the kinetic model developed of use in identifying key processes in the generation of harmful oxidants in living systems. | Keller AN, Eckle SB, Xu W, Liu L, Hughes VA, Mak JY, Meehan BS, Pediongco T, Birkinshaw RW, Chen Z, Wang H, D'Souza C, Kjer-Nielsen L, Gherardin NA, Godfrey DI, Kostenko L, Corbett AJ, Purcell AW, Fairlie DP, McCluskey J, Rossjohn J (2017)
Drugs and drug-like molecules can modulate the function of mucosal-associated invariant T cells.
Nature immunology 18, 402-411 [PubMed:28166217]
[show Abstract]
The major-histocompatibility-complex-(MHC)-class-I-related molecule MR1 can present activating and non-activating vitamin-B-based ligands to mucosal-associated invariant T cells (MAIT cells). Whether MR1 binds other ligands is unknown. Here we identified a range of small organic molecules, drugs, drug metabolites and drug-like molecules, including salicylates and diclofenac, as MR1-binding ligands. Some of these ligands inhibited MAIT cells ex vivo and in vivo, while others, including diclofenac metabolites, were agonists. Crystal structures of a T cell antigen receptor (TCR) from a MAIT cell in complex with MR1 bound to the non-stimulatory and stimulatory compounds showed distinct ligand orientations and contacts within MR1, which highlighted the versatility of the MR1 binding pocket. The findings demonstrated that MR1 was able to capture chemically diverse structures, spanning mono- and bicyclic compounds, that either inhibited or activated MAIT cells. This indicated that drugs and drug-like molecules can modulate MAIT cell function in mammals. | Moss JI, Pontes E, Hansen PJ (2009)
Insulin-like growth factor-1 protects preimplantation embryos from anti-developmental actions of menadione.
Archives of toxicology 83, 1001-1007 [PubMed:19593550]
[show Abstract]
Menadione is a naphthoquinone used as a vitamin K source in animal feed that can generate reactive oxygen species (ROS) and cause apoptosis. Here, we examined whether menadione reduces development of preimplantation bovine embryos in a ROS-dependent process and tested the hypothesis that actions of menadione would be reduced by insulin-like growth factor-1 (IGF-1). Menadione caused a concentration-dependent decrease in the proportion of embryos that became blastocysts. All concentrations tested (1, 2.5, and 5.0 microM) inhibited development. Treatment with 100 ng/ml IGF-1 reduced the magnitude of the anti-developmental effects of the two lowest menadione concentrations. Menadione also caused a concentration-dependent increase in the percent of cells positive for the TUNEL reaction. The response was lower for IGF-1-treated embryos. The effects of menadione were mediated by ROS because (1) the anti-developmental effect of menadione was blocked by the antioxidants dithiothreitol and Trolox and (2) menadione caused an increase in ROS generation. Treatment with IGF-1 did not reduce ROS formation in menadione-treated embryos. In conclusion, concentrations of menadione as low as 1.0 muM can compromise development of bovine preimplantation embryos to the blastocyst stage of development in a ROS-dependent mechanism. Anti-developmental actions of menadione can be blocked by IGF-1 through effects downstream of ROS generation. | Qadri SM, Eberhard M, Mahmud H, Föller M, Lang F (2009)
Stimulation of ceramide formation and suicidal erythrocyte death by vitamin K(3) (menadione).
European journal of pharmacology 623, 10-13 [PubMed:19766112]
[show Abstract]
Vitamin K(3) is an essential micronutrient required for the activation of coagulation factors and thus hemostasis. Administration of vitamin K(3) analogues may cause anemia, which at least in theory could be due to stimulation of suicidal erythrocyte death or eryptosis characterized by cell shrinkage and phospholipid scrambling of the erythrocyte cell membrane leading to exposure of phosphatidylserine at the erythrocyte surface. Eryptosis is triggered by an increase in the cytosolic Ca(2+) activity, by ceramide and by energy depletion (decrease of cytosolic ATP). The present experiments explored, whether vitamin K(3) may influence eryptosis. Hemolysis was estimated from the supernatant hemoglobin concentration, phosphatidylserine-exposing erythrocytes from annexin V-binding in fluorescence-activated cell sorter (FACS) analysis, erythrocyte volume from forward scatter in FACS analysis, ceramide formation from binding of fluorescent antibodies, and erythrocyte ATP content from a luciferin-luciferase assay. As a result, vitamin K(3) (> or =1microM) caused lysis of an only small fraction of erythrocytes, but significantly increased ceramide formation, significantly increased the percentage of annexin V-binding erythrocytes, significantly decreased forward scatter and, at higher concentrations, significantly decreased the cellular ATP content. In conclusion, vitamin K(3) stimulates suicidal erythrocyte death, an effect at least partially due to ceramide formation and ATP depletion. | Matsubara K, Kayashima T, Mori M, Yoshida H, Mizushina Y (2008)
Inhibitory effects of vitamin K3 on DNA polymerase and angiogenesis.
International journal of molecular medicine 22, 381-387 [PubMed:18698499]
[show Abstract]
Vitamins play essential roles in cellular reactions and maintain human health. Recent studies have revealed that some vitamins including D3, B6 and K2 and their derivatives have an anti-cancer effect. As a mechanism, their inhibitory effect on cancer-related angiogenesis has been demonstrated. Vitamin K2 (menaquinones) has an anti-cancer effect in particular for hepatic cancer and inhibits angiogenesis. In the current study, we demonstrated that sole vitamin K3 (menadione) selectively inhibits the in vitro activity of eukaryotic DNA polymerase gamma, which is a mitochondrial DNA polymerase, and suppresses angiogenesis in a rat aortic ring model. The anti-angiogenic effect of vitamin K3 has been shown in angiogenesis models using human umbilical vein endothelial cells (HUVECs) with regard to HUVEC growth, tube formation on reconstituted basement membrane and chemotaxis. These results suggest that vitamin K3 may be a potential anti-cancer agent like vitamin K2. | Thijssen HH, Vervoort LM, Schurgers LJ, Shearer MJ (2006)
Menadione is a metabolite of oral vitamin K.
The British journal of nutrition 95, 260-266 [PubMed:16469140]
[show Abstract]
Phylloquinone is converted into menaquinone-4 and accumulates in extrahepatic tissues. Neither the route nor the function of the conversion is known. One possible metabolic route might be the release of menadione from phylloquinone by catabolic activity. In the present study we explored the presence of menadione in urine and the effect of vitamin K intake on its excretion. Menadione in urine was analysed by HPLC assay with fluorescence detection. Urine from healthy male volunteers was collected before and after administration of a single dose of K vitamins. Basal menadione excretion in non-supplemented subjects (n 6) was 5.4 (sd 3.2) microg/d. Urinary menadione excretion increased greatly after oral intake of the K vitamins, phylloquinone and menaquinone-4 and -7. This effect was apparent within 1-2 h and peaked at about 3 h after intake. Amounts of menadione excreted in 24 h after vitamin K intake ranged, on a molar basis, from 1 to 5 % of the administered dose, indicating that about 5-25 % of the ingested K vitamins had been catabolized to menadione. Menadione excretion was not enhanced by phylloquinone administered subcutaneously or by 2',3'-dihydrophylloquinone administered orally. In archived samples from a depletion/repletion study (Booth et al. (2001) Am J Clin Nutr 74, 783-790), urinary menadione excretion mirrored dietary phylloquinone intake. The present study shows that menadione is a catabolic product of K vitamins formed after oral intake. The rapid appearance in urine after oral but not subcutaneous administration suggests that catabolism occurs during intestinal absorption. The observations make it likely that part of the menaquinone-4 in tissues results from uptake and prenylation of circulating menadione. | Kwaśnicka-Crawford DA, Vincent SR (2005)
Role of a novel dual flavin reductase (NR1) and an associated histidine triad protein (DCS-1) in menadione-induced cytotoxicity.
Biochemical and biophysical research communications 336, 565-571 [PubMed:16140270]
[show Abstract]
Microsomal cytochrome P450 reductase catalyzes the one-electron transfer from NADPH via FAD and FMN to various electron acceptors, such as cytochrome P450s or to some anti-cancer quinone drugs. This results in generation of free radicals and toxic oxygen metabolites, which can contribute to the cytotoxicity of these compounds. Recently, a cytosolic NADPH-dependent flavin reductase, NR1, has been described which is highly homologous to the microsomal cytochrome P450 reductase. In this study, we show that over-expression of NR1 in human embryonic kidney cells enhances the cytotoxic action of the model quinone, menadione. Furthermore, we show that a novel human histidine triad protein DCS-1, which is expressed together with NR1 in many tissues, can significantly reduce menadione-induced cytotoxicity in these cells. We also show that DCS-1 binds NF1 and directly modulates its activity. These results suggest that NR1 may play a role in carcinogenicity and cell death associated with one-electron reductions. | Strunnikova N, Hilmer S, Flippin J, Robinson M, Hoffman E, Csaky KG (2005)
Differences in gene expression profiles in dermal fibroblasts from control and patients with age-related macular degeneration elicited by oxidative injury.
Free radical biology & medicine 39, 781-796 [PubMed:16109308]
[show Abstract]
The pathogenesis of age-related macular degeneration (AMD) is still unknown but there is growing evidence that a combination of both oxidative injury and genetic factors may play a role. One particle hypothesis proposes that dysregulation of multiple genes in response to an oxidative injury could contribute to the development of AMD. While direct examination of ocular cells from AMD patients is difficult, AMD also appears to have a systemic component. Therefore, as is the case with other central nervous diseases, peripheral sites may also manifest any underlying genetic abnormalities. For the present study, biopsy-derived fibroblasts from 4 patients with the early form and 4 patients with the late form of AMD and 3 age-matched control patients were grown in culture and treated with a nonlethal dose of the oxidative stimulus menadione. Gene expression patterns were quantitatively and qualitatively examined using Human Genome U95A GeneChips (Affymetrix) and verified by real-time PCR analysis. In response to the oxidative injury 755 genes were found to be upregulated at least twofold in one of the patients groups. Cluster analysis of expression profiles detected six patterns of dysregulation initiated by oxidative injury specific for the disease groups (98 genes total). Clusters of genes dysregulated by the sublethal oxidative injury in either early and/or late AMD groups were further categorized by overrepresentation of GO "biological process" categories using Expression Analysis Systematic Explorer (EASE) software. This approach demonstrated that four major functional gene groups including inflammatory/innate immune response, transcriptional regulation, cell cycle, and proliferation were significantly overrepresented (Fisher test ranging from 0.0393 to 0.00018) in both AMD patients groups in response to the oxidative injury. Despite the small number of patients in the study, specific biological and statistical differences in gene expression profiles between control and AMD patients were identified but only in the presence of an environmental stimulus. | Harrington DJ, Soper R, Edwards C, Savidge GF, Hodges SJ, Shearer MJ (2005)
Determination of the urinary aglycone metabolites of vitamin K by HPLC with redox-mode electrochemical detection.
Journal of lipid research 46, 1053-1060 [PubMed:15722567]
[show Abstract]
We describe a method for the determination of the two major urinary metabolites of vitamin K as the methyl esters of their aglycone structures, 2-methyl-3-(3'-3'-carboxymethylpropyl)-1,4-naphthoquinone (5C-aglycone) and 2-methyl-3-(5'-carboxy-3'-methyl-2'-pentenyl)-1,4-naphthoquinone (7C-aglycone), by HPLC with electrochemical detection (ECD) in the redox mode. Urinary salts were removed by reversed-phase (C18) solid-phase extraction (SPE), and the predominantly conjugated vitamin K metabolites were hydrolyzed with methanolic HCl. The resulting carboxylic acid aglycones were quantitatively methylated with diazomethane and fractionated by normal-phase (silica) SPE. Final analysis was by reversed-phase (C18) HPLC with a methanol-aqueous mobile phase. Metabolites were detected by amperometric, oxidative ECD of their quinol forms, which were generated by postcolumn coulometric reduction at an upstream electrode. The assay gave excellent linearity (typically, r2 > or = 0.999) and high sensitivity with an on-column detection limit of < 3.5 fmol (< 1 pg). The interassay precision was typically 10%. Metabolite recovery was compared with that of an internal standard [2-methyl-3-(7'-carboxy-heptyl)-1,4-naphthoquinone] added to urine samples just before analysis. Using this methodology, we confirmed that the 5C- and 7C-aglycones were major catabolites of both phylloquinone (vitamin K1) and menaquinones (vitamin K2) in humans. We propose that the measurement of urinary vitamin K metabolite excretion is a candidate noninvasive marker of total vitamin K status. | Adams MA, Jia Z (2005)
Structural and biochemical evidence for an enzymatic quinone redox cycle in Escherichia coli: identification of a novel quinol monooxygenase.
The Journal of biological chemistry 280, 8358-8363 [PubMed:15613473]
[show Abstract]
Naturally synthesized quinones perform a variety of important cellular functions. Escherichia coli produce both ubiquinone and menaquinone, which are involved in electron transport. However, semiquinone intermediates produced during the one-electron reduction of these compounds, as well as through auto-oxidation of the hydroxyquinone product, generate reactive oxygen species that stress the cell. Here, we present the crystal structure of YgiN, a protein of hitherto unknown function. The three-dimensional fold of YgiN is similar to that of ActVA-Orf6 monooxygenase, which acts on hydroxyquinone substrates. YgiN shares a promoter with "modulator of drug activity B," a protein with activity similar to that of mammalian DT-diaphorase capable of reducing mendione. YgiN was able to reoxidize menadiol, the product of the "modulator of drug activity B" (MdaB) enzymatic reaction. We therefore refer to YgiN as quinol monooxygenase. Modulator of drug activity B is reported to be involved in the protection of cells from reactive oxygen species formed during single electron oxidation and reduction reactions. The enzymatic activities, together with the structural characterization of YgiN, lend evidence to the possible existence of a novel quinone redox cycle in E. coli. | Habu D, Shiomi S, Tamori A, Takeda T, Tanaka T, Kubo S, Nishiguchi S (2004)
Role of vitamin K2 in the development of hepatocellular carcinoma in women with viral cirrhosis of the liver.
JAMA 292, 358-361 [PubMed:15265851]
[show Abstract]
ContextPrevious findings indicate that vitamin K2 (menaquinone) may play a role in controlling cell growth.ObjectiveTo determine whether vitamin K2 has preventive effects on the development of hepatocellular carcinoma in women with viral cirrhosis of the liver.Design, setting, and participantsForty women diagnosed as having viral liver cirrhosis were admitted to a university hospital between 1996 and 1998 and were randomly assigned to the treatment or control group. The original goal of the trial was to assess the long-term effects of vitamin K2 on bone loss in women with viral liver cirrhosis. However, study participants also satisfied criteria required for examination of the effects of such treatment on the development of hepatocellular carcinoma.InterventionsThe treatment group received 45 mg/d of vitamin K2 (n = 21). Participants in the treatment and control groups received symptomatic therapy to treat ascites, if necessary, and dietary advice.Main outcome measureCumulative proportion of patients with hepatocellular carcinoma.ResultsHepatocellular carcinoma was detected in 2 of the 21 women given vitamin K2 and 9 of the 19 women in the control group. The cumulative proportion of patients with hepatocellular carcinoma was smaller in the treatment group (log-rank test, P =.02). On univariate analysis, the risk ratio for the development of hepatocellular carcinoma in the treatment group compared with the control group was 0.20 (95% confidence interval [CI], 0.04-0.91; P =.04). On multivariate analysis with adjustment for age, alanine aminotransferase activity, serum albumin, total bilirubin, platelet count, alpha-fetoprotein, and history of treatment with interferon alfa, the risk ratio for the development of hepatocellular carcinoma in patients given vitamin K2 was 0.13 (95% CI, 0.02-0.99; P =.05).ConclusionThere is a possible role for vitamin K2 in the prevention of hepatocellular carcinoma in women with viral cirrhosis. | Osman AM, Rotteveel S, den Besten PJ, van Noort PC (2004)
In vivo exposure of Dreissena polymorpha mussels to the quinones menadione and lawsone: menadione is more toxic to mussels than lawsone.
Journal of applied toxicology : JAT 24, 135-141 [PubMed:15052609]
[show Abstract]
The principal aim of this study was to assess whether the two quinones, menadione (2-methyl-1,4-naphthoquinone) and lawsone (2-hydroxy-1,4-naphthoquinone), elicit differential toxicity in mussels as has been reported for higher organisms. Therefore, the effects of short-term (48 h) and long-term (20 days) exposure of the two quinones at concentrations of 0.56 and 1 mg l(-1) to zebra mussels, Dreissena polymorpha, under laboratory conditions were studied. After the short-term exposure, the specific activities of the two-electron quinone oxidoreductase (DT-diaphorase) and the one-electron catalysing quinone reductases NADPH-cytochrome c reductase and NADH-cytochrome c reductase were determined in the gills and the rest of the soft tissues (soft mussel tissues minus the gills) of both treated and control mussels. At the higher concentrations of menadione and lawsone used, a significant reduction of the activity of NADPH-cytochrome c reductase in the gills and in the rest of the soft mussel tissues (by 33-34% and 31-43%, respectively) was observed. The activities of DT-diaphorase and NADH-cytochrome c reductase were not significantly affected. Interestingly, DT-diaphorase was observed in the gills, an organ requiring protection against antioxidants. Furthermore, a single-cell electrophoretic assay (comet assay) performed with gill cells to assess DNA damage by the quinones did not show any significant difference between the treated and the control organisms. This indicates that the formation of reactive species by the quinone metabolism in vivo in the mussels was possibly suppressed through the concerted action of DT-diaphorase and antioxidant enzymes. The results of in vitro experiments with gill extracts confirmed the protective role of DT-diaphorase. The rate of the two-electron quinone reduction was found to be five times that of the one-electron quinone reduction. The results of the long-term exposure unambiguously demonstrated that in mussels menadione, unlike in higher organisms, is more toxic than lawsone. The lack of detectability of xanthine oxidase in the mussel tissues could explain the comparatively lower toxicity of lawsone in the invertebtrate, lending support to a previous suggestion that xanthine oxidase might be responsible for the mechanism of toxicity of lawsone in higher organisms in vivo. | Lasalvia-Prisco E, Cucchi S, Vázquez J, Lasalvia-Galante E, Golomar W, Gordon W (2003)
Serum markers variation consistent with autoschizis induced by ascorbic acid-menadione in patients with prostate cancer.
Medical oncology (Northwood, London, England) 20, 45-52 [PubMed:12665684]
[show Abstract]
In vitro exposure of malignant prostate cell lines to ascorbic acid-menadione showed that tumor cells were killed through a mechanism named autoschizis. Experimental animal studies showed that autoschizis is also evident when ascorbic acid-menadione is administered to nude mice with implanted human prostate tumors. Prostate-specific antigen (PSA) is a known serum marker of prostate tumor cells specific activity. Recently, total serum homocysteine has been identified as a marker of tumor cell numbers with sensitivity for early detection of tumor cell death induced by treatments. A clinical trial with prostate cancer patients submitted to the association of ascorbic acid-menadione was performed and PSA/homocysteine was assessed in the follow- up. The early response in serum PSA and homocysteine levels was reported. The results showed that ascorbic acid-menadione produced an immediate drop in tumor cell numbers as assessed by homocysteine levels. Serum PSA levels showed an early rise and later dropped. These results suggest that autoschizis can also be induced by this pharmacological association at the clinical level in prostate cancer patients. Further studies are being performed in order to research if these results can be found with other primary tumors as it was shown in in vitro and experimental models. Ascorbic acid-menadione could be emerging as a new antitumoral chemotherapy. | Snider BJ, Moss JL, Revilla FJ, Lee CS, Wheeler VC, Macdonald ME, Choi DW (2003)
Neocortical neurons cultured from mice with expanded CAG repeats in the huntingtin gene: unaltered vulnerability to excitotoxins and other insults.
Neuroscience 120, 617-625 [PubMed:12895502]
[show Abstract]
Glutamate-mediated excitotoxicity might contribute to the pathogenesis of Huntington's disease and other polyglutamine repeat disorders. We used murine neocortical cultures derived from transgenic and knock-in mice to test the effect of expression of expanded polyglutamine-containing huntingtin on neuronal vulnerability to excitotoxins or other insults. Neurons cultured from mice expressing either a normal length (Hdh(Q20)) or expanded (Hdh(Q111)) CAG repeat as a knock-in genetic alteration in exon one of the mouse Hdh gene [Hum Mol Genet 8 (1999) 115] had similar vulnerability to N-methyl-D-aspartate (NMDA) and kainate-mediated excitotoxicity. These neurons also exhibited similar vulnerability to oxidative stress (24 h exposure to 10-100 microM paraquat or 1-10 microM menadione), apoptosis (48 h exposure to 30-100 nM staurosporine or 1 microM dizocilpine maleate (MK-801) and proteasome inhibition (48 h exposure to 0.3-3 microM MG-132). Neocortical neurons cultured from mice transgenic for an expanded CAG repeat-containing exon 1 of the human HD gene (Mangiarini et al., 1996, R6/2 line) and non-transgenic littermate controls also had similar vulnerability to NMDA and kainate-mediated excitotoxicity. These observations suggest that expression of expanded polyglutamine-containing huntingtin does not acutely alter the vulnerability of cortical neurons to excitotoxic, oxidative or apoptotic insults. | Suzuki S, Iwata G, Sutor AH (2001)
Vitamin K deficiency during the perinatal and infantile period.
Seminars in thrombosis and hemostasis 27, 93-98 [PubMed:11372776]
[show Abstract]
Coagulation-related plasma proteins develop slowly during the gestational period and are still markedly lower than normal at birth. Great interest exists in the status of the vitamin K-dependent procoagulant factors (factors II, VII, IX and X) because a number of healthy newborns develop postpartum a bleeding tendency that is due to vitamin K deficiency. The most serious cases involve intracranial bleeding with convulsions, coma and potential death. Typically, these infants have markedly prolonged prothrombin times that shorten following the administration of vitamin K. A common feature of these infants is that they are breast-fed, although other factors, especially hepatobiliary diseases, contribute to this disorder. Vitamin K deficiency bleeding can develop as early as in the first 24 hours after birth, but most infants are diagnosed between days 2 and 7 postpartum. Late forms (> 1 week and up to 6 months) are also noted. This deficiency can be compensated for by prophylactically administering vitamin K to the newborns or by bottle-feeding. Although vitamin K2 may pass in small quantities through the placenta, it is insufficient to make up for the deficit. The first dose of vitamin K can also be given orally to the newborn after one or two regular feedings, and the second dose can be administered upon discharge from the hospital. A problem that remains to be solved is the late development of vitamin K deficiency in spite of prophylaxis at birth. | Foster CE, Bianchet MA, Talalay P, Zhao Q, Amzel LM (1999)
Crystal structure of human quinone reductase type 2, a metalloflavoprotein.
Biochemistry 38, 9881-9886 [PubMed:10433694]
[show Abstract]
In mammals, two separate but homologous cytosolic quinone reductases have been identified: NAD(P)H:quinone oxidoreductase type 1 (QR1) (EC 1.6.99.2) and quinone reductase type 2 (QR2). Although QR1 and QR2 are nearly 50% identical in protein sequence, they display markedly different catalytic properties and substrate specificities. We report here two crystal structures of QR2: in its native form and bound to menadione (vitamin K(3)), a physiological substrate. Phases were obtained by molecular replacement, using our previously determined rat QR1 structure as the search model. QR2 shares the overall fold of the major catalytic domain of QR1, but lacks the smaller C-terminal domain. The FAD binding sites of QR1 and QR2 are very similar, but their hydride donor binding sites are considerably different. Unexpectedly, we found that QR2 contains a specific metal binding site, which is not present in QR1. Two histidine nitrogens, one cysteine thiol, and a main chain carbonyl group are involved in metal coordination. The metal binding site is solvent-accessible, and is separated from the FAD cofactor by a distance of about 13 A. | Chen Q, Cederbaum AI (1997)
Menadione cytotoxicity to Hep G2 cells and protection by activation of nuclear factor-kappaB.
Molecular pharmacology 52, 648-657 [PubMed:9380028]
[show Abstract]
Menadione (vitamin K-3,2-methyl-1,4-naphthoquinone), a redox cycling reagent, generates reactive oxygen intermediates and causes oxidative injury. The addition of menadione to Hep G2 cells produced a time- and concentration-dependent loss of cell viability. Preincubation of Hep G2 cells with low, nontoxic concentrations of menadione increased the viability of the cells against toxic doses of menadione or H2O2. Maximum protection was found with menadione concentrations of approximately 3 microM and preincubation times of approximately 45 min. This protective effect could be blocked by the protein synthesis inhibitor cycloheximide and by a variety of antioxidants. The transcription factor nuclear factor-kappaF (NF-kappaB) is known to be activated by many compounds, including reactive oxygen intermediates. Menadione activated NF-kappaB as determined by electrophoretic mobility shift assays. This activation was prevented by the same antioxidants that blocked protection against cytotoxicity produced by preincubation with menadione. Anti-p50 IgG prevented the menadione-stimulated binding of NF-kappaB to the oligonucleotide probe, whereas anti-p65 IgG produced a supershift of the NF-kappaB/oligonucleotide complex. Salicylate prevented the activation of NF-kappaB by menadione, and under these conditions, salicylate potentiated the cytotoxicity of menadione or H2O2. Transfection with a plasmid containing cDNA encoding mouse IkappaBbeta, an inhibitor of NF-kappaB, resulted in increased toxicity by menadione. Furthermore, when protein kinase C was down-regulated by prolonged treatment with active phorbol ester (phorbol-12-myristate-13-acetate), the Hep G2 cells became more sensitive to menadione treatment. However, short term treatment with PMA, which activated NF-kappaB, resulted in protection against menadione cytotoxicity. Menadione cytotoxicity was enhanced when the Hep G2 cells were depleted of GSH. An increased level of GSH was observed after menadione pretreatment; this increase was blocked by salicylate, thereby linking the GSH increase to activation of NF-kappaB by menadione. The results of the current study suggest that menadione pretreatment protects Hep G2 cells from oxidative injury through an NF-kappaB-related mechanism, which may involve, in part, increased production of GSH. | Price RJ, Mistry H, Wield PT, Renwick AB, Beamand JA, Lake BG (1996)
Comparison of the toxicity of allyl alcohol, coumarin and menadione in precision-cut rat, guinea-pig, cynomolgus monkey and human liver slices.
Archives of toxicology 71, 107-111 [PubMed:9010592]
[show Abstract]
The toxicity of allyl alcohol, coumarin and menadione has been studied in precision-cut liver slice cultures. Liver slices were prepared from male Sprague-Dawley rats, male Dunkin-Hartley guinea-pigs and from samples of Cynomolgus monkey and human liver using a Krumdieck tissue slicer. The liver slices were cultured with the test compounds for 24 h in a dynamic organ culture system. Toxicity was assessed by measurement of protein synthesis, potassium content and the MTT assay. At the concentrations examined, menadione produced marked toxicity in liver slices from all four species, whereas rat liver slices were less susceptible to allyl alcohol toxicity. Coumarin produced concentration-dependent toxic effects in rat and guinea-pig liver slices, whereas Cynomolgus monkey and human liver slices were relatively resistant, especially at low coumarin concentrations. At some concentrations of the test compounds examined, the MTT assay appeared to be a less sensitive indicator of toxicity than either protein synthesis or potassium content. These results demonstrate the usefulness of precision-cut liver slices for assessing species differences in xenobiotic-induced toxicity. | Thijssen HH, Drittij-Reijnders MJ (1996)
Vitamin K status in human tissues: tissue-specific accumulation of phylloquinone and menaquinone-4.
The British journal of nutrition 75, 121-127 [PubMed:8785182]
[show Abstract]
We measured the vitamin K status in postmortem human tissues (brain, heart, kidney, liver, lung, pancreas) to see if there is a tissue-specific distribution pattern. Phylloquinone (K1) was recovered in all tissues with relatively high levels in liver, heart and pancreas (medians, 10.6 (4.8), 9.3 (4.2), 28.4 (12.8) pmol(ng)/g wet weight tissue); low levels (< 2 pmol/g) were found in brain, kidney and lung. Menaquinone-4 (MK-4) was recovered from most of the tissues; its levels exceeded the K1 levels in brain and kidney (median, 2.8 ng/g) and equalled K1 in pancreas. Liver, heart and lung were low in MK-4. The higher menaquinones, MK-6-11, were recovered in the liver samples (n 6), traces of MK-6-9 were found in some of the heart and pancreas samples. The results show that in man there are tissue-specific, vitamin-K distribution patterns comparable to those in the rat. Furthermore, the accumulation of vitamin K in heart, brain and pancreas suggests a hitherto unrecognized physiological function of this vitamin. | Iioka H, Moriyama IS, Morimoto K, Akada S, Hisanaga H, Ishihara Y, Ichijo M (1991)
Pharmacokinetics of vitamin K in mothers and children in the perinatal period: transplacental transport of vitamin K2 (MK-4).
Asia-Oceania journal of obstetrics and gynaecology 17, 97-100 [PubMed:2064595]
[show Abstract]
In order to examine the pharmacokinetics of vitamin K2, vitamin K2 (MK-4) was intravenously injected into mothers, and its transfer to placental tissue and the fetuses was examined. While incorporation of vitamin K2 into placental tissue was relatively active, transfer of vitamin K2 to fetal blood (cord blood) was small. So it was indicated that vitamin K2 incorporated into placental tissue from maternal blood is initially stored in the placenta and then gradually released into the fetal blood. Since vitamin K deficiency has been pointed out, release of vitamin K2 into milk was also examined. When vitamin K2 (MK-4) was injected into mothers, the release of vitamin K2 into milk increased with time even after the plasma vitamin K2 concentration in maternal blood decreased. So the presence of a vitamin K2 concentrating mechanism in the mammary tissue was indicated. | Varga JM, Kalchschmid G, Klein GF, Fritsch P (1991)
Mechanism of allergic cross-reactions--I. Multispecific binding of ligands to a mouse monoclonal anti-DNP IgE antibody.
Molecular immunology 28, 641-654 [PubMed:1650428]
[show Abstract]
A recently developed solid-phase binding assay was used to investigate the specificity of ligand binding to a mouse monoclonal anti-dinitrophenyl IgE [IgE(aDNP)]. All DNP-amino acids, that were tested, inhibited the binding of radio-labeled IgE(aDNP) to DNP covalently attached to polystyrene microtiter plates; however, the concentration for 50% inhibition varied within four orders of magnitude, DNP-L-serine being the most, DNP-proline the least potent inhibitor. In addition to DNP analogues a large number (2074) of drugs and other compounds were tested for their ability to compete with DNP for the binding site of IgE(aDNP). At the concentrations used for screening 59% of the compounds had no significant inhibition; 19% inhibited the binding of IgE(aDNP) more than 50%. Several families of compounds (tetracyclines, polymyxines, phenotiazines, salicylates and quinones) of effective competitors were found. Within these families change in the functional groups attached to the "family stem" had major effects on the affinity of ligand binding. The occurrence frequencies of interactions of ligands with IgE(aDNP) is in good agreement with a semi-empirical model for multispecific antibody-ligand interactions. | Robertson DG, Bailey DL, Martin RA (1991)
Species differences in response to photohemolytic agents.
Photochemistry and photobiology 53, 455-461 [PubMed:1857739]
[show Abstract]
Species differences in red blood cell susceptibility to the photohemolytic agents chlorpromazine, menadione and tetracycline were examined in mouse, rat, dog, and human blood. Menadione and tetracycline (25 microM) hemolyzed mouse but not dog, rat, or human red blood cells (RBC) when irradiated with UV light but not in the dark. Chlorpromazine (25 microM) produced a photohemolytic response in all four species with mouse and rat RBC lysing fastest followed by human then dog cells. Investigations into the nature of these species differences suggested that the size of mouse RBC may contribute to its high sensitivity to photohemolytic agents. An investigation of the effect of UV light on key antioxidant enzymes revealed species differences in enzyme inactivation. These data suggest that mouse RBC may be particularly vulnerable to phototoxic agents, especially those compounds which produce active oxygen species and, therefore, may prove more useful than human RBC as a model for predicting phototoxic potential of some chemical entities. | Usui Y, Tanimura H, Nishimura N, Kobayashi N, Okanoue T, Ozawa K (1990)
Vitamin K concentrations in the plasma and liver of surgical patients.
The American journal of clinical nutrition 51, 846-852 [PubMed:2333843]
[show Abstract]
Vitamin K deficiency has been reported in patients who were treated with antibiotics and placed on poor diets after surgery. High-performance liquid chromatography (HPLC) was used to study the influence of dietary intake on vitamin K concentrations in surgical patients (n = 22). Plasma phylloquinone decreased rapidly from 1.19 +/- 0.16 to 0.47 +/- 0.12 nmol/L (means +/- SEM, n = 11) on a low-phylloquinone diet and from 1.16 +/- 0.12 to 0.36 +/- 0.07 nmol/L (n = 11) by postoperative fasting. A small amount of phylloquinone and a large amount of menaquinone were found in liver tissue. Phylloquinone concentration was 28.0 +/- 4.3 pmol/g liver (wet weight) on the standard diet (n = 7) whereas it was 6.8 +/- 1.1 pmol/g on the low-phylloquinone diet after 3 d (n = 8). Because phylloquinone is rapidly depleted by fasting, it may be difficult to prevent vitamin K deficiency by dietary phylloquinone alone during long-term fasting after surgery. | Ono M, Ohta H, Ohhira M, Sekiya C, Namiki M (1990)
Measurement of immunoreactive prothrombin, des-gamma-carboxy prothrombin, and vitamin K in human liver tissues: overproduction of immunoreactive prothrombin in hepatocellular carcinoma.
The American journal of gastroenterology 85, 1149-1154 [PubMed:1697141]
[show Abstract]
Des-gamma-carboxy prothrombin is an abnormal prothrombin which increases in the plasma of patients with hepatocellular carcinoma. To clarify the process of des-gamma-carboxy prothrombin synthesis, immunoreactive prothrombin, des-gamma-carboxy prothrombin, and vitamin K (phylloquinone and menaquinone) concentrations were determined in human liver tissue, including hepatocellular carcinoma. In the patients with elevated plasma des-gamma-carboxy prothrombin levels, both immunoreactive prothrombin and des-gamma-carboxy prothrombin significantly increased in hepatoma tissues compared with non-cancerous liver tissue. On the other hand, no significant difference was observed in the endogenous vitamin K (K1, MK-4, MK7) concentrations between hepatoma and noncancerous portions, in either the cases with or without increase of plasma des-gamma-carboxy prothrombin. These data strongly suggested that in the patients with an increase of plasma des-gamma-carboxy prothrombin, overproduction of prothrombin in hepatoma plays in important role in the synthesis of des-gamma-carboxy prothrombin. | Wermuth B, Platts KL, Seidel A, Oesch F (1986)
Carbonyl reductase provides the enzymatic basis of quinone detoxication in man.
Biochemical pharmacology 35, 1277-1282 [PubMed:3083821]
[show Abstract]
Enzymes catalyzing the two-electron reduction of quinones to hydroquinones are thought to protect the cell against quinone-induced oxidative stress. Using menadione as a substrate, carbonyl reductase, a cytosolic, monomeric oxidoreductase of broad specificity for carbonyl compounds, was found to be the main NADPH-dependent quinone reductase in human liver, whereas DT-diaphorase, the principal two-electron transferring quinone reductase in rat liver, contributed a very minor part to the quinone reductase activity of human liver. Carbonyl reductase from liver was indistinguishable from carbonyl reductase previously isolated from brain (B. Wermuth, J. biol. Chem. 256, 1206 (1981] on the basis of molecular weight, isoelectric point, immunogenicity, substrate specificity and inhibitor sensitivity. The purified enzyme from liver catalyzed the reduction of a great variety of quinones. The best substrates were benzo- and naphthoquinones with short substituents, and the K-region orthoquinones of phenanthrene, benz(a)anthracene, pyrene and benzo(a)pyrene. A long hydrophobic side chain in the 3-position of the benzo- and naphthoquinones and the vicinity of a bay area or aliphatic substituent (pseudo bay area) to the oxo groups of the polycyclic compounds decreased or abolished the ability of the quinone to serve as a substrate. Non-k-region orthoquinones of polycyclic aromatic hydrocarbons were more slowly reduced than the corresponding K-region derivatives. The broad specificity of carbonyl reductase for quinones is in keeping with a role of the enzyme as a general quinone reductase in the catabolism of these compounds. | ULBRICH AP (1961)
Topical application of menadione, a synthetic vitamin K: preliminary report.
The Journal of the American Osteopathic Association 60, 370-374 [PubMed:13779073] |
|
