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- W1773847159 abstract "Gap junctions (GJs) play an important role in the regulation of cell response to many drugs. However, little is known about their mechanisms. Using an in vitro model of cytotoxicity induced by geneticin (G418), we explored the potential signalling mechanisms involved. Incubation of cells with G418 resulted in cell death, as indicated by the change in cell morphology, loss of cell viability and activation of caspase-3. Before the onset of cell injury, G418 induced reactive oxygen species (ROS) generation, activated oxidative sensitive kinase P38 and caused a shift of connexin 43 (Cx43) from non-phosphorylated form to hyperphosphorylated form. These changes were largely prevented by antioxidants, suggesting an implication of oxidative stress. Downregulation of Cx43 with inhibitors or siRNA suppressed the expression of thioredoxin-interacting protein (TXNIP), activated Akt and protected cells against the toxicity of G418. Further analysis revealed that inhibition of TXNIP with siRNA activated Akt and reproduced the protective effect of Cx43-inhibiting agents, whereas suppression of Akt sensitized cells to the toxicity of G418. Furthermore, interference of TXNIP/Akt also affected puromycin- and adriamycin-induced cell injury. Our study thus characterized TXNIP as a presently unrecognized molecule implicated in the regulatory actions of Cx43 on oxidative drug injury. Targeting Cx43/TXNIP/Akt signalling cascade might be a promising approach to modulate cell response to drugs." @default.
- W1773847159 created "2016-06-24" @default.
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- W1773847159 date "2015-07-08" @default.
- W1773847159 modified "2023-10-15" @default.
- W1773847159 title "A novel<scp>TXNIP</scp>‐based mechanism for Cx43‐mediated regulation of oxidative drug injury" @default.
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- W1773847159 doi "https://doi.org/10.1111/jcmm.12641" @default.
- W1773847159 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4594688" @default.
- W1773847159 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/26154105" @default.
- W1773847159 hasPublicationYear "2015" @default.
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