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• W1980743210 abstract "Bacterial heat shock proteins (hsps) can have various effects on human cells. We investigated whether bacterial hsp60s can protect epithelial cells from cell death by affecting the mitogen-activated protein kinase (MAPK) signal pathways. Cell protection was studied by adding bacterial hsp60s to skin keratinocyte cultures (HaCaT cell line) before UV radiation. The results show that hsp60 significantly protected against UV radiation-induced cell death. Effects of UV radiation and exogenous hsp60 on phosphorylation of MAPKs and on activation of caspase 3 were examined by Western blot analysis. UV radiation strongly induced phosphorylation of p38 MAPK and formation of active caspase 3. A p38 inhibitor, SB 203580, totally blocked UV radiation-mediated activation of caspase 3. Preincubation with hsp60 strongly induced phosphorylation of ERK1/2 and inhibited UV radiation-mediated activation of caspase 3. PD 98059, a specific inhibitor of the ERK1/2 pathway, blocked this inhibitory effect of exogenous hsp60. Studies on the association between activity of MAPKs or caspase 3 and cell death showed that the ERK1/2 pathway inhibitor reversed protective effect of hsp60 while specific inhibition of p38 and caspase 3 reduced cell death. These results indicate that in HaCaT cells UV radiation mediates cell death through activation of p38 followed by caspase 3 activation. Exogenous hsp60 partially protects against UV radiation-mediated epithelial cell death through activation of ERK1/2, which inhibits caspase 3 activation." @default.
• W1980743210 created "2016-06-24" @default.
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• W1980743210 date "2004-01-01" @default.
• W1980743210 modified "2023-10-06" @default.
• W1980743210 title "Bacterial GroEL-like heat shock protein 60 protects epithelial cells from stress-induced death through activation of ERK and inhibition of caspase 3" @default.
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• W1980743210 doi "https://doi.org/10.1016/j.yexcr.2003.08.012" @default.
• W1980743210 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/14720522" @default.
• W1980743210 hasPublicationYear "2004" @default.
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