Abstract
Cancer thermotherapy and radiofrequency ablation (RFA) have been adopted as modalities for treating various kinds of cancer. We have previously demonstrated that bone morphogenetic protein-4 (BMP-4) is up-regulated in colonic adenocarcinoma. Here, we investigated whether an increase of BMP-4 expression changes cellular response to heat treatment in human colon cancer HCT116 cells. BMP-4 overexpressing HCT116 cells generated by stable transfection showed a significantly increased survival rate and a decreased apoptotic rate in comparison to empty vector controls after heat treatment at 45 degrees C for 20min. The expression levels and pattern of HSP90, HSP70, and HSP27 after heat treatment were similar between these two cell lines. There was no difference in expression levels of Bcl-2 and Bax in these two cell lines and their expression remained unchanged after heat treatment. Both activities of the extracellular signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK) were stimulated by heat in these cells. Comparatively, BMP-4 overexpressing cells had an intense and prolonged ERK activation, while a less intense and short JNK activation. Correspondingly, treatment of BMP-4 overexpressing cells with noggin, a BMP-4 antagonist, resulted in a reduction of heat-activated ERK but an increase of heat-activated JNK and significantly increased heat-induced apoptotic rate. These results indicate that BMP-4 can protect colon cancer cells from heat-induced apoptosis through enhancing the activation of ERK as well as inhibiting the activation of JNK.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adenocarcinoma / enzymology
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Adenocarcinoma / genetics
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Adenocarcinoma / metabolism
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Adenocarcinoma / therapy*
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Apoptosis* / drug effects
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Bone Morphogenetic Protein 4
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Bone Morphogenetic Proteins / genetics
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Bone Morphogenetic Proteins / metabolism*
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Carrier Proteins / metabolism
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Cell Survival
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Colonic Neoplasms / enzymology
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Colonic Neoplasms / genetics
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Colonic Neoplasms / metabolism
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Colonic Neoplasms / pathology
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Colonic Neoplasms / therapy*
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Extracellular Signal-Regulated MAP Kinases / antagonists & inhibitors
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Extracellular Signal-Regulated MAP Kinases / metabolism*
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Flavonoids / pharmacology
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HCT116 Cells
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HSP27 Heat-Shock Proteins
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HSP70 Heat-Shock Proteins / metabolism
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HSP90 Heat-Shock Proteins / metabolism
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Heat-Shock Proteins / metabolism
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Humans
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Hyperthermia, Induced*
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JNK Mitogen-Activated Protein Kinases / metabolism*
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Molecular Chaperones
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Neoplasm Proteins / metabolism
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Phosphorylation
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Protein Kinase Inhibitors / pharmacology
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Proto-Oncogene Proteins c-bcl-2 / metabolism
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Signal Transduction* / drug effects
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Time Factors
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Transfection
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Up-Regulation
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bcl-2-Associated X Protein / metabolism
Substances
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BAX protein, human
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BMP4 protein, human
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Bone Morphogenetic Protein 4
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Bone Morphogenetic Proteins
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Carrier Proteins
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Flavonoids
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HSP27 Heat-Shock Proteins
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HSP70 Heat-Shock Proteins
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HSP90 Heat-Shock Proteins
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HSPB1 protein, human
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Heat-Shock Proteins
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Molecular Chaperones
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Neoplasm Proteins
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Protein Kinase Inhibitors
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Proto-Oncogene Proteins c-bcl-2
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bcl-2-Associated X Protein
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noggin protein
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Extracellular Signal-Regulated MAP Kinases
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JNK Mitogen-Activated Protein Kinases
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2-(2-amino-3-methoxyphenyl)-4H-1-benzopyran-4-one