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| Forskolin (coleonol) is a labdane diterpene produced by the plant Coleus barbatus (blue spur flower). Other names include pashanabhedi, Indian coleus, makandi, HL-362, mao hou qiao rui hua. As with other members of the large diterpene class of plant metabolites, forskolin is derived from geranylgeranyl pyrophosphate (GGPP). Forskolin contains some unique functional elements, including the presence of a tetrahydropyran-derived heterocyclic ring.
Forskolin is commonly used in laboratory research to increase levels of cyclic AMP by stimulation of adenylate cyclase. |
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Read full article at Wikipedia
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InChI=1S/C22H34O7/c1- 8-19(5)11-14(25)22(27)20(6)13(24)9-10-18(3,4)16(20)15(26)17(28-12(2)23)21(22,7)29-19/h8,13,15-17,24,26-27H,1,9-11H2,2-7H3/t13-,15-,16-,17-,19-,20-,21+,22-/m0/s1 |
| OHCQJHSOBUTRHG-KGGHGJDLSA-N |
| [H][C@@]12[C@H](O)[C@H](OC(C)=O)[C@@]3(C)O[C@](C)(CC(=O)[C@]3(O)[C@@]1(C)[C@@H](O)CCC2(C)C)C=C |
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plant metabolite
Any eukaryotic metabolite produced during a metabolic reaction in plants, the kingdom that include flowering plants, conifers and other gymnosperms.
anti-HIV agent
An antiviral agent that destroys or inhibits the replication of the human immunodeficiency virus.
protein kinase A agonist
A protein kinase agonist that selectively binds to and activates a protein kinase A receptor
adenylate cyclase agonist
Any agonist of one or more of the isoforms of adenylate cyclase (EC 4.6.1.1).
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antihypertensive agent
Any drug used in the treatment of acute or chronic vascular hypertension regardless of pharmacological mechanism.
platelet aggregation inhibitor
A drug or agent which antagonizes or impairs any mechanism leading to blood platelet aggregation, whether during the phases of activation and shape change or following the dense-granule release reaction and stimulation of the prostaglandin-thromboxane system.
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View more via ChEBI Ontology
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(3R,4aR,5S,6S,6aS,10S,10aR,10bS)-3-ethenyl-6,10,10b-trihydroxy-3,4a,7,7,10a-pentamethyl-1-oxododecahydro-1H-benzo[f]chromen-5-yl acetate
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colforsin
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ChemIDplus
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colforsina
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ChemIDplus
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colforsine
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ChemIDplus
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colforsinum
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ChemIDplus
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7β-acetoxy-8,13-epoxy-1α,6β,9α-trihydroxylabd-14-en-11-one
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ChemIDplus
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Coleonol
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KEGG COMPOUND
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Coleonolk
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KEGG COMPOUND
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Colforsin
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KEGG COMPOUND
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FORSKOLIN
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PDBeChem
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Forskolin
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KEGG COMPOUND
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C00003416
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KNApSAcK
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C09076
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KEGG COMPOUND
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D03584
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KEGG DRUG
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DB02587
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DrugBank
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DE2557784
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Patent
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FOK
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PDBeChem
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Forskolin
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Wikipedia
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US4088659
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Patent
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US4476140
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Patent
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| View more database links |
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4300863
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Reaxys Registry Number
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Reaxys
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66428-89-5
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CAS Registry Number
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ChemIDplus
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66575-29-9
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CAS Registry Number
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ChemIDplus
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Bodiwala HS, Sabde S, Mitra D, Bhutani KK, Singh IP (2009)
Anti-HIV diterpenes from Coleus forskohlii.
Natural product communications 4, 1173-1175 [PubMed:19831022]
[show Abstract]
Various extracts of the aerial parts of Coleus forskohlii (Labiatae) were prepared and evaluated at their non cytotoxic concentration against HIV-1 NL4-3. Chloroform, ethyl acetate and n-butanol extracts showed 45.6, 66.5 and 37.7% inhibition of HIV, respectively in CEM-GFP cells infected with HIV-1(NL4-3) at 5 microg/mL. Four diterpenes, 1-deoxyforskolin, 1,9-dideoxyforskolin, forskolin and isoforskolin were isolated from the chloroform extract and tested against the virus. Six semi-synthetic derivatives of forskolin have been prepared to study SAR. 1-Deoxyforskolin and forskolin were found to be active against HIV(NL4-3). This is first report of anti HIV activity of this plant and its isolated constituents. | Faherty S, Fitzgerald A, Keohan M, Quinlan LR (2007)
Self-renewal and differentiation of mouse embryonic stem cells as measured by Oct4 expression: the role of the cAMP/PKA pathway.
In vitro cellular & developmental biology. Animal 43, 37-47 [PubMed:17570033]
[show Abstract]
In this study we examined the role of the cAMP/protein kinase A (PKA) pathway in affecting IOUD2 ES cell self-renewal and differentiation, Oct4 expression, and cell proliferation. Forskolin, the adenylate cyclase agonist, alone had no effect on ES cell self-renewal. However, when cells were treated with the differentiation-inducing agent retinoic acid, forskolin significantly promoted ES cell self-renewal. Effectively, forskolin rescued cells from a pathway of differentiation. Culturing ES cells in the presence of the phosphodiesterase inhibitor IBMX had no effect on ES cell self-renewal but did increase cell proliferation. In the presence of 100 muM IBMX without LIF, 10 muM forskolin significantly increased ES cell self-renewal. The cell permeable cAMP analog 8-Br-cAMP (1 and 5 mM) promoted ES cell differentiation in the presence of LIF, while in the absence of LIF, it promoted ES cell self-renewal. The effect of the PKA specific inhibitors H89 and KT5720 on Oct4 expression was, again, LIF-dependent. In the presence of LIF, these inhibitors decreased Oct4 expression, while they increased Oct4 expression in the absence of LIF. In general, ES cells maintained on a self-renewal pathway through the presence of LIF show little effect from altered cAMP signaling except at higher levels. However, in strict contrast, when ES cell are on a differentiation pathway through exposure to retinoic acid or the removal of LIF, altering cAMP levels can rescue the self-renewal process promoting Oct4 expression. This study clearly shows that the cAMP/PKA pathway plays a role in ES cell self-renewal pathways. | Park YG, Kim YH, Kang SK, Kim CH (2006)
cAMP-PKA signaling pathway regulates bone resorption mediated by processing of cathepsin K in cultured mouse osteoclasts.
International immunopharmacology 6, 947-956 [PubMed:16644480]
[show Abstract]
Cathepsin K (Cat K) is the major cysteine protease expressed in osteoclast and is thought to play a key role in matrix degradation during bone resorption. It is shown that the intracellular maturation of Cat K was prevented by the cAMP antagonist, Rp-cAMP, and the protein kinase A (PKA) inhibitors of KT5720 and H89. In contrast, forskolin, an adenylate cyclase agonist, rather induced Cat K processing and maturation in osteoclast. Furthermore, to determine whether Cat K processing and maturation signaling involves protein kinase C (PKC), mouse total bone cells were treated with calphostin C, a specific inhibitor of PKC, however, no effect was observed, indicating that PKC calphostin C did not affect to osteoclast-mediated Cat K processing and maturation in osteoclast. Thus, it is indicated that the cAMP-PKA signaling pathway regulate Cat K maturation in osteoclast. Since secreted proenzymes have the potential to reenter the cell via M6P receptor, to prevent this possibility, we tested cAMP antagonist Rp-cAMP and the PKA inhibitors KT5720 and H89 in the absence or presence of M6P. Inhibition of Cat K processing by Rp-cAMP, KT5720 or H89 was observed in a dose-dependent manner. Furthermore, the addition of M6P resulted in enhanced potency of Rp-cAMP, KT5720 and H89, which dose-dependently inhibited in vitro bone resorption with potency similar to that observed for inhibition of Cat K processing. | Liang HM, Tang M, Liu CJ, Luo HY, Song YL, Hu XW, Xi JY, Gao LL, Nie B, Li SY, Lai LL, Hescheler J (2004)
Muscarinic cholinergic regulation of L-type calcium channel in heart of embryonic mice at different developmental stages.
Acta pharmacologica Sinica 25, 1450-1457 [PubMed:15525467]
[show Abstract]
AimTo investigate the muscarinic regulation of L-type calcium current (I(Ca-L)) during development.MethodsThe whole cell patch-clamp technique was used to record II(Ca-L) in mice embryonic cardiomyocytes at different stages (the early developmental stage, EDS; the intermediate developmental stage, IDS; and the late developmental stage, LDS). Carbachol (CCh) was used to stimulate M-receptor in the embryonic cardiomyocytes of mice.ResultsThe expression of I(Ca-L) density did not change in different developmental stages (P>0.05). There was no difference in the sensitivity of I(Ca-L) to CCh during development (P>0.05). This inhibitory action of CCh was mediated by inhibition of cyclic AMP since 8-bromo-cAMP completely reversed the muscarinic inhibitory action. IBMX, a non-selective inhibitor of phosphodiesterase (PDE), reversed the inhibitory action of M-receptor on I(Ca-L) current by 71.2 %+/-9.2 % (n=8) and 11.3 %+/-2.5 % (n=9) in EDS and LDS respectively. However forskolin, an agonist of adenylyl cyclase (AC), reversed the action of CCh by 14.5 %+/-3.5 % (n=5) and 82.7 %+/-10.4 % (n=7) in EDS and LDS respectively.ConclusionThe inhibitory action of CCh on I(Ca-L) current was mediated in different pathways: in EDS, the inhibitory action of M-receptor on I(Ca-L) channel mainly depended on the stimulation of PDE. However, in LDS, the regulation by M-receptor on I(Ca-L) channel mainly depended on the inactivation of AC. | Wu X, Walker J, Zhang J, Ding S, Schultz PG (2004)
Purmorphamine induces osteogenesis by activation of the hedgehog signaling pathway.
Chemistry & biology 11, 1229-1238 [PubMed:15380183]
[show Abstract]
Previously, a small molecule, purmorphamine, was identified that selectively induces osteogenesis in multipotent mesenchymal progenitor cells. In order to gain insights into the mechanism of action of purmorphamine, high-density oligonucleotide microarrays were used to profile gene expression in multipotent mesenchymal progenitor cells treated with either purmorphamine or bone morphogenetic protein-4 (BMP-4). In contrast to BMP-4 treatment, purmorphamine activates the Hedgehog (Hh) signaling pathway, resulting in the up- and downregulation of its downstream target genes, including Gli1 and Patched. Moreover, the known Hh signaling antagonists, cyclopamine and forskolin, completely block the osteogenesis and Glimediated transcription induced by purmorphamine. These results demonstrate that purmorphamine is a small molecule agonist of Hedgehog signaling, and it may ultimately be useful in the treatment of bone-related disease and neurodegenerative disease. | Park YG, Kang SK, Noh SH, Park KK, Chang YC, Lee YC, Kim CH (2004)
PGE2 induces IL-1beta gene expression in mouse osteoblasts through a cAMP-PKA signaling pathway.
International immunopharmacology 4, 779-789 [PubMed:15135319]
[show Abstract]
Prostaglandin E2 (PGE2), an abundant eicosanoid in bone, has been implicated in a number of pathological states associated with bone loss and is also known to stimulate matrix metalloproteinase-1 synthesis and secretion in rat and human osteoblast cells, although the intracellular reactions responsible for this remain unclear. Interleukin-1beta (IL-1beta) is a cytokine that plays a critical role in bone remodeling and appears to act as a downstream effector of most bone-resorbing agents. However, the issue of whether PGE2 regulates the expression of IL-1beta in mouse osteoblasts has not been resolved. In this work, we demonstrate that PGE2 is a potent inducer of IL-1beta production by fetal osteoblasts and show that PGE2 stimulates the activity of the IL-1beta promoter in osteoblasts, suggesting that PGE2 controls IL-1beta gene expression at least at the transcriptional level. PGE2 was found to induce IL-1beta mRNA expression in the cells within 4 h and the level of expression was maintained for 36 h. A dose-related increase in IL-1beta production was found with 0.1-2.0 microM PGE2. The induction of IL-1beta protein in the medium paralleled the induction of IL-1beta mRNA levels. The role of cAMP activation in PGE2-mediated IL-1beta production was examined by the effects of forskolin, an adenylyl cyclase (AC) activator and dideoxyadenosine (DDA), an AC inhibitor. Forskolin enhanced and DDA blocked the production of IL-1beta by PGE2. In addition, PGE2-mediated IL-1beta induction was completely inhibited by the cAMP antagonist, Rp-cAMP, and protein kinase A (PKA) inhibitors of KT5720 and H89. The PGE2-induced production of IL-1beta was also blocked by the PKA inhibitor PKI14-22. However, a specific inhibitor of protein kinase C, calphostin C, had no affect on PGE2-induced IL-1beta gene expression. Among the potential agonists, forskolin was a potent inducer of IL-1beta expression, while phorbol myristate acetate and serum had little effect. These findings indicate that PGE2 involves the cAMP-PKA signaling pathway in regulating IL-1beta gene expression in osteoblasts. | Luo XH, Liao EY, Su X, Wu XP (2004)
Parathyroid hormone inhibits the expression of membrane-type matrix metalloproteinase-1 (MT1-MMP) in osteoblast-like MG-63 cells.
Journal of bone and mineral metabolism 22, 19-25 [PubMed:14691682]
[show Abstract]
Parathyroid hormone (PTH) can stimulate bone resorption by increasing the activity and the number of osteoclasts in bone tissue by several mechanisms. Recently, osteoblast-derived membrane-type matrix metalloproteinase-1 (MT1-MMP) has been implied to play an important role in the process of bone resorption by degrading bone matrix. In the present study, we observed the effects of PTH (1-34) on MT1-MMP production, and the role of the protein kinase A (PKA) and protein kinase C (PKC) pathways in the regulation of MT1-MMP in cultures of human osteoblast-like MG-63 cells. By Northern blot and Western immunoblot analysis, we found, unexpectedly, that PTH (1-34) inhibited MT1-MMP mRNA and protein expression in a dose- and time-dependent manner in MG-63 cells. The PKA antagonist H-89 blunted PTH (1-34)-mediated decreases in MT1-MMP protein synthesis. Forskolin, a PKA agonist, decreased MT1-MMP expression, which was similar to the action of PTH on MT1-MMP expression, in MG-63 cells. Staurosporine, a PKC inhibitor, also blocked the inhibition by PTH. We suggest that both the PKA and PKC pathways are involved in MT1-MMP downregulation by PTH. Furthermore, we found that PTH (1-34) induced the expression of receptor activator of nuclear factor (NF)-KappaB ligand (RANKL) mRNA in a dose- and time-dependent manner in MG-63 cells, and this effect of PTH on RANKL mRNA expression was nearly parallel to the effects of MT1-MMP downregulation, implying a correlation between MT1-MMP and RANKL expression. Our findings suggest that the decreased MT1-MMP expression induced by PTH may be involved in RANKL signaling in osteoblasts, and may play a role in the activation of bone resorption. | Tarpey SB, Sawmiller DR, Kelly C, Thompson WJ, Townsley MI (2003)
Phosphodiesterase 3 activity is reduced in dog lung following pacing-induced heart failure.
American journal of physiology. Lung cellular and molecular physiology 284, L766-73 [PubMed:12676767]
[show Abstract]
We hypothesized that decreases in expression and/or activity of cAMP-specific phosphodiesterases (PDE) contribute to protective adaptations observed in lung after heart failure. In this study, we compared PDE activity in lung parenchyma isolated from control dogs and those paced to heart failure by assaying cyclic nucleotide hydrolysis in fractions of homogenate supernatant eluted from DEAE-Trisacryl columns. Cyclic nucleotide hydrolysis due to PDE3, PDE4, and PDE5 isoforms was predominant in both control and paced groups. The ratio of PDE3 activity to total cAMP PDE activity was decreased in the paced group compared with control (P < 0.05), whereas PDE4 or PDE5 activity ratios were not different between the two groups. With the use of RT-PCR, message expression for PDE3A or PDE3B did not differ between the two groups. Cilostamide, a selective PDE3 inhibitor, and forskolin, a nonspecific agonist for adenylyl cyclase, both inhibited thapsigargin-induced increases in endothelial permeability in control lung. We conclude that PDE3 activity, but not mRNA expression, is reduced in lung from dogs paced to heart failure, a change that could contribute to heart failure-induced attenuation of the lung endothelial permeability response to injury. | Carruba G, Webber MM, Quader ST, Amoroso M, Cocciadiferro L, Saladino F, Trosko JE, Castagnetta LA (2002)
Regulation of cell-to-cell communication in non-tumorigenic and malignant human prostate epithelial cells.
The Prostate 50, 73-82 [PubMed:11816015]
[show Abstract]
BackgroundGap-junction-mediated intercellular communication (GJIC) is required for normal development and tissue homeostasis. However, the role of GJIC in human prostate carcinogenesis and progression remains ill-defined.MethodsThe ability of hormones, anti-hormones, and the anti-hypertensive drug, forskolin, to restore GJIC in non-tumorigenic (RWPE-1 and PWR-1E) and malignant (RWPE-2, LNCaP, DU-145) human prostate epithelial cell lines, was examined by Scrape-Loading/Dye Transfer (SL/DT) and Fluorescence Recovery After Photobleaching (FRAP) methods using an Ultima laser cytometer.ResultsResults from both assays show that PWR-1E, RWPE-2, LNCaP, and DU-145 cells have weak or absent GJIC activity. However, the non-tumorigenic RWPE-1 cells showed restoration of some GJIC (nearly 10%) after 1 hr in the FRAP assay. Forskolin and estrone, which increase intracellular cAMP levels, induced a significant and consistent increase (2.8- and 4.4-fold, respectively) in cell-to-cell communication only in the non-tumorigenic RWPE-1 cells. Furthermore, estrone induced a two-fold increase in connexin 43 (Cx43) and a 30% decrease in Cx32 expression, while forskolin caused a 50% reduction in Cx32 with no effect on Cx43 expression in RWPE-1 cells.ConclusionsThese data suggest that agents that increase Cx43:Cx32 ratio may be used to restore GJIC in junctionally-deficient, non-tumorigenic immortalized cells, thus providing insights into potential mechanisms responsible for the multistep carcinogenesis in the human prostate. | Guo H, Tittle TV, Allen H, Maziarz RT (1998)
Brefeldin A-mediated apoptosis requires the activation of caspases and is inhibited by Bcl-2.
Experimental cell research 245, 57-68 [PubMed:9828101]
[show Abstract]
Brefeldin A (BFA) has recently been shown to induce apoptosis in human tumor cells in a p53-independent fashion. In this study, BFA-induced apoptosis was analyzed in the human Jurkat T-cell line. Apoptosis occurred 8 h after treatment with BFA and at concentrations as low as 10 ng/ml and increased with the duration of BFA exposure. Forskolin, an inhibitor of BFA-induced deaggregation of the Golgi-microtubular complex in some cell lines, failed to reverse BFA-mediated apoptosis. Further study of the mechanism of BFA-induced apoptosis was conducted by using a series of peptide protease inhibitors. Complete inhibition of cell death was achieved with benzyloxycarbonyl-Val-Ala-Asp-fluromethylketone, a peptide inhibitor of the caspase protease family, and Z-Asp-Glu-Val-Asp-FMK, a specific inhibitor of caspase-3. Both Acetyl-Tyr-Val-Ala-Asp-chloromethylketone and Acetyl-Tyr-Val-Ala-Asp-aldehyde, selective caspase-1 (interleukin-1beta converting enzyme) inhibitors, exerted only partial protection of cells from apoptosis at higher concentrations. Z-Phe-Ala-FMK, a cysteine protease inhibitor lacking aspartate at the P1 position, did not have any impact on BFA-induced apoptosis. Furthermore, Jurkat cells transfected with the proto-oncoprotein Bcl-2, which is able to block various apoptotic conditions, showed remarkable resistance to the apoptotic effect of BFA. Thus, the data indicate that BFA-induced apoptosis requires caspase(s) activation, primarily the activation of caspase-3, and is inhibited by overexpression of Bcl-2. | Mustafa SB, Olson MS (1998)
Expression of nitric-oxide synthase in rat Kupffer cells is regulated by cAMP.
The Journal of biological chemistry 273, 5073-5080 [PubMed:9478958]
[show Abstract]
Treatment of cultured rat Kupffer cells with lipopolysaccharide (LPS) resulted in a time-dependent increase in the expression of the inducible isoform of nitric-oxide synthase (iNOS). Agents that elevated intracellular cAMP levels (e.g. forskolin, dibutyryl cAMP, cholera toxin, and isoproterenol) markedly decreased nitrite production and iNOS protein formation by LPS-stimulated Kupffer cells. Furthermore, inhibition of LPS-induced nitrite formation and iNOS protein levels by these agents was enhanced in the presence of the phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine. Forskolin, the most potent inhibitor of LPS-induced nitrite formation by Kupffer cells, decreased iNOS mRNA levels in a time-dependent manner. Time course studies indicated that forskolin was most effective at inhibiting LPS-induced nitrite formation and iNOS mRNA levels by Kupffer cells when added before LPS. Message stability studies established that forskolin did not enhance the rate of decay of LPS-induced iNOS mRNA. Nuclear run-on assays revealed that forskolin decreased LPS-induced transcription of the iNOS gene. Treatment of Kupffer cells with LPS induced the translocation of the p65 subunit of nuclear factor kappaB (NF-kappaB) into the nucleus, and this process was abolished by forskolin. In addition, the LPS-dependent degradation of IkappaBalpha was not observed in forskolin-treated cells; the levels of the p65 subunit of NF-kappaB were minimal in the nucleus at the same time. Also, we observed that forskolin induced transcription of the IkappaBalpha gene in a time-dependent manner and in addition up-regulated LPS-induced IkappaBalpha mRNA levels. Taken together, this study indicates that the attenuation of LPS-induced iNOS formation in Kupffer cells by elevated intracellular cAMP levels occurs by preventing the degradation of IkappaBalpha which suppresses the activation of NF-kappaB and inhibits the onset of transcription of the iNOS gene. | Bruder JT, Kovesdi I (1997)
Adenovirus infection stimulates the Raf/MAPK signaling pathway and induces interleukin-8 expression.
Journal of virology 71, 398-404 [PubMed:8985363]
[show Abstract]
Previous studies have shown that airway administration of adenovirus or adenovirus vectors results in a dose-dependent inflammatory response which limits the duration of transgene expression. We explored the possibility that adenovirus infection triggers signal transduction pathways that induce the synthesis of cytokines and thus contribute to the early inflammatory response. Since stimulation of the Raf/mitogen-activated protein kinase (MAPK) pathway activates transcription factors that control the expression of inflammatory cytokines, we examined the activation of this pathway following adenovirus infection. Adenovirus infection induced the rapid activation of Raf-1 and a transient increase in the tyrosine phosphorylation and activation of p42mapk at early times postinfection. Activation of the Raf/MAPK pathway by adenovirus is likely triggered by the infection process, since it occurred rapidly and with various mutant adenoviruses and adenovirus vectors. Moreover, interleukin-8 (IL-8) mRNA accumulation was evident at 20 min postinfection and was induced even in the presence of cycloheximide. Both MAPK activation and IL-8 production were inhibited by forskolin, a potent inhibitor of Raf-1. These results suggest that adenovirus-induced Raf/MAPK activation contributes to IL-8 production. Adenovirus-induced activation of the Raf/MAPK signaling pathway and IL-8 production may play critical roles in the inflammation observed following in vivo administration of adenovirus vectors for gene therapy. | Sethi R, Dhalla NS (1995)
Inotropic responses to isoproterenol in congestive heart failure subsequent to myocardial infarction in rats.
Journal of cardiac failure 1, 391-399 [PubMed:12836714]
[show Abstract]
It is well known that the positive inotropic effect of catecholamines is mediated through the activation of adrenergic receptors and the formation of cyclic adenosine monophosphate (AMP) in the cardiac cell. Although attenuated responses of failing hearts to catecholamines are commonly seen in patients and experimental animals with coronary artery disease, their mechanisms are poorly understood. To examine the status of beta-adrenergic receptors and postadrenergic receptor mechanisms in congestive heart failure due to myocardial infarction, the left coronary artery in rats was ligated for 4 and 8 weeks before studying the hemodynamic and biochemical changes due to isoproterenol, a beta-adrenoceptor agonist, or forskolin, a postreceptor agonist. Isolated perfused rat heart preparations were also used for studying changes in contractile function and cyclic AMP content. The hemodynamic actions and changes in the left ventricular cyclic AMP content in the experimental animals were depressed, not only in response to isoproterenol but also to forskolin. The density of beta-adrenoceptors was also decreased in the failing myocardium. In isolated perfused hearts from the 8-week experimental animals, isoproterenol-induced as well as forskolin-induced increases in both contractile force and cyclic AMP content in the left ventricle were depressed. These data suggest that defects in both beta-adrenergic receptor and postreceptor sites may be involved in attenuating the response of infarcted hearts to catecholamines. | Yoshizawa J, Yoshida K, Fujikawa T, Tanabe A, Sakurai K (1995)
[Inhibitory effects of Forskolin on hepatic metastasis from human colon cancer in nude mice].
Nihon Geka Gakkai zasshi 96, 26-30 [PubMed:7898427]
[show Abstract]
Platelet aggregation has been believed to play an important role in implantation of tumor cells into the target organ during the early phase of tumor metastasis. In the present study, the effects of Forskolin, a strong platelet aggregation inhibitor, on experimental hepatic metastasis from human colon cancer (HT29LMM) in nude mice and inhibitory effects of Forskolin on platelet aggregation in the presence of tumor cells were evaluated. A hepatic metastasis model was established by intrasplenic implantation of 3-4 x 10(6) of HT29LMM human colon cancer cells in nude mice. Intraperitoneally 10mg/kg of Forskolin was given 30 minutes before and 24 hours, after implantation of tumor cells, respectively. The control group received saline instead of Forskolin. Phase of hepatic metastasis has been compared for the total weight of hepatic metastatic lesions and the occupied rate between the Forskolin-given group and the control group. The total weight of hepatic metastasis lesions (0.36 +/- 0.33g (SD) vs 3.36 +/- 1.31g) and the occupied rate (8.22 +/- 7.91% vs 67.9 +/- 23.2%) were significantly low in the Forskolin-given group compared with the control group. In vitro inhibitory effects of Forskolin on platelet aggregation was recognized under the presence of HT291LMM. This study suggests that the platelet aggregation inhibitor drug. Forskolin, inhibits hepatic metastasis from human colon cancer by preventing platelet aggregation during the metastatic tumor formation. | Martin GE, Rutherford NG, Henderson PJ, Walmsley AR (1995)
Kinetics and thermodynamics of the binding of forskolin to the galactose-H+ transport protein, GalP, of Escherichia coli.
The Biochemical journal 308 ( Pt 1), 261-268 [PubMed:7755573]
[show Abstract]
The binding of the transport inhibitor, forskolin, to the galactose-H+ symporter, GalP, of Escherichia coli was evaluated by equilibrium and time-resolved fluorescence measurements. A quench in protein fluorescence of 8-12% was observed upon the binding of forskolin. The overall dissociation constant (Kd) for forskolin determined by fluorescence titration ranged between 1.2 and 2.2 microM, which is similar to that reported from equilibrium dialysis measurements of the binding of [3H]forskolin (Kd = 0.9-1.4 microM). The kinetics of forskolin binding were measured by stopped-flow fluorescence methods. The protein fluorescence was quenched in a biphasic manner; the faster of these two rates was dependent on the concentration of forskolin and was interpreted as the initial binding step from which both the association (kon) and dissociation (koff) rate constants were determined. The association and dissociation rate constants were 5.4-6.2 microM-1.s-1 and 5.1-11.5 s-1 respectively, and the Kd was calculated to be 1.5 microM. The binding of forskolin was inhibited by D-galactose, but not by L-galactose, and displacement by sugar provided an additional method to calculate the dissociation rate constant for forskolin (koff = 12.4-13.0 s-1). The rate of the slow change in protein fluorescence (3-5 s-1) was independent of the forskolin concentration, indicating an isomerization of the transporter between different conformations, possibly outward- and inward-facing forms. These kinetic parameters were determined at a series of temperatures, so that the thermodynamics of forskolin binding and transporter re-orientation could be analysed. The binding process was entropically driven (delta S = 83.7 J.K-1.mol-1; delta H = 8.25 kJ.mol-1), similar to that for cytochalasin B, which is also an inhibitor of GalP. Measurements of the binding of [3H]forskolin by equilibrium dialysis revealed competitive displacement of bound forskolin by cytochalasin B, possibly suggesting that the sugar, forskolin and cytochalasin B binding sites are overlapping; the Kds for forskolin and cytochalasin B were calculated to be 0.85 microM and 4.77 microM respectively, and the concentration of binding sites was 10.2 nmol.mg-1. | Anfossi G, Massucco P, Mularoni E, Cavalot F, Mattiello L, Trovati M (1994)
Effects of forskolin and organic nitrate on aggregation and intracellular cyclic nucleotide content in human platelets.
General pharmacology 25, 1093-1100 [PubMed:7875530]
[show Abstract]
1. The present study investigated the effect of a combination between forskolin, a naturally occurring diterpene which directly activates adenylyl cyclase, and glyceryl trinitrate (GTN), which enhances intraplatelet cyclic guanosine monophosphate levels, on human platelet aggregation and intracellular content of cyclic nucleotides 3',5'-cyclic adenosine monophosphate (cAMP) and 3',5'-cyclic guanosine monophosphate (cGMP). 2. Forskolin inhibited, in a dose-dependent way, platelet aggregation in response to collagen and adrenaline in platelet-rich plasma. In whole blood samples, forskolin inhibited collagen-stimulated aggregation. In presence of forskolin the intraplatelet cAMP levels were significantly increased. 3. GTN directly decreased the platelet response to collagen in whole blood samples (IC50 = 122 mumol/l) and it increased the intraplatelet levels of both cGMP and cAMP. 4. GTN at 20 and 40 mumol potentiated the inhibitory effects of forskolin on platelet aggregation in both platelet-rich plasma and whole blood. 5. Our results suggest a synergistic effect of the simultaneous increase of both cAMP and cGMP on the biochemical steps involved in the inhibition of the platelet response. | Martin GE, Seamon KB, Brown FM, Shanahan MF, Roberts PE, Henderson PJ (1994)
Forskolin specifically inhibits the bacterial galactose-H+ transport protein, GalP.
The Journal of biological chemistry 269, 24870-24877 [PubMed:7929167]
[show Abstract]
Forskolin is a potent inhibitor of mammalian passive glucose transporters. Here we show that forskolin is a remarkably specific inhibitor of energized D-galactose transport by the GalP sugar-H+ symport protein of Escherichia coli. Surprisingly, it does not inhibit transport of L-arabinose or D-xylose by the related E. coli AraE and XylE transporters, even though the amino acid sequences of their proteins are 30-64% identical to GalP and to the mammalian GLUT family. However, unlike GLUT1, photoactivation of the [3H]forskolin-GalP complex fails to incorporate radioactivity covalently into the protein, in contrast to the effective incorporation of radioactivity from [3H]cytochalasin B into both proteins. However, 3-[125I]iodo-4-azidophenethylamido-7-O-succinyldesacetylforskol in ([125I]APS-forskolin), which labels GLUT1, is a potent labeling reagent for GalP and, to a lesser extent, for AraE. The appropriate sugar substrates of each transporter protect it against the [125I]APS-forskolin. Equilibrium binding studies using membranes from an E. coli strain that overexpresses GalP reveal a single set of high affinity binding sites for [3H]forskolin with a Kd of 1.3-1.4 microM, probably forming a 1:1 complex, compared with a value of 7.5 microM for GLUT1. Sugar substrates of GalP and cytochalasin B displace forskolin from the protein. The nonhomologous sugar-H+ symporters for L-rhamnose (RhaT), L-fucose (FucP) and lactose (LacY) in E. coli are insensitive to forskolin. Forskolin and [125I]APS-forskolin, therefore, constitute novel probes for exploring the structure-activity relationship of the bacterial GalP protein. GalP will provide an excellent model for the human glucose transporters and for elucidating the molecular basis of subtle differences in substrate and inhibitor recognition by individual members of this widespread family of transport proteins. | Katagiri H, Asano T, Ishihara H, Lin JL, Inukai K, Shanahan MF, Tsukuda K, Kikuchi M, Yazaki Y, Oka Y (1993)
Role of tryptophan-388 of GLUT1 glucose transporter in glucose-transport activity and photoaffinity-labelling with forskolin.
The Biochemical journal 291 ( Pt 3), 861-867 [PubMed:8489512]
[show Abstract]
GLUT1 glucose-transporter cDNA was modified to substitute leucine for Trp-388 and transfected into Chinese hamster ovary cells using the expression vector termed pMTHneo. This tryptophan residue is conserved among most of the facilitative glucose-transporter isoforms and has been proposed to be the photolabelling site of forskolin, a competitive inhibitor of glucose transport. In addition, this residue is located on membrane-spanning helix 10 which is suggested to contain the dynamic segment of the transporter. The mutated glucose transporter was expressed and inserted into the plasma membrane in a fashion similar to the wild-type. Unexpectedly, this mutation did not abolish photolabelling with forskolin. However, the mutation induced a marked decrease in 2-deoxyglucose uptake with a 4-fold decrease in turnover number and a 1.25-fold increase in Km compared with the wild-type GLUT1. A similar decrease in zero-trans influx activity was also observed for 3-O-methylglucose. In contrast, no apparent decrease was observed in zero trans efflux activity for 3-O-methylglucose. The mutation decreased the turnover number of the glucose transporter in equilibrium exchange influx for 3-O-methylglucose by 33% without any change in Km. These results indicate that (1) Trp-388 is not the photolabelling site for forskolin, if we assume that the labelling occurs at a single site and (2) Trp-388 is more likely to be involved in interconversion between the inward-facing and outward-facing conformers of GLUT1 than binding of glucose, and thus, substitution of leucine for Trp-388 in this dynamic segment would decrease the rate of alternating conformation, which would preferentially affect the influx activity. | Arata Y, Tada S, Ui M (1992)
Probable occurrence of toxin-susceptible G proteins in the nematode Caenorhabditis elegans.
FEBS letters 300, 73-76 [PubMed:1547891]
[show Abstract]
Pertussis toxin, islet-activating protein (IAP), and cholera toxin ADP-ribosylated 40 kDa and 45 kDa proteins in membrane preparations from Caenorhabditis elegans. Proteins with the same molecular weights were recognized in the same membranes by an antibody that had been raised against a peptide common to alpha-subunits of mammalian alpha beta gamma-heterotrimeric G proteins. The antibody produced immunoprecipitation with the 40 kDa protein 32P-labeled by IAP. A 35 kDa protein immunochemically indistinguishable from the beta-component of mammalian G proteins was also found in C. elegans membranes. The membranes displayed adenylate cyclase activity which was highly sensitive to forskolin and GTP analogues, whose action was antagonized by GDP beta S. Receptor-coupled regulation of adenylate cyclase thus appears to be mediated by mammalian-type G proteins in C. elegans as well. |
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