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- W2219005311 abstract "Stannin (Snn) is a highly conserved vertebrate protein that has been closely linked to trimethyltin (TMT) toxicity. We have previously demonstrated that Snn is required for TMT-induced cell death. Others have shown that TMT exposure results in tumor necrosis factor-alpha (TNFalpha) production and that TNFalpha treatment induces Snn gene expression in human umbilical vein endothelial cells (HUVECs). In this study, we investigated a signaling mechanism by which Snn gene expression is regulated by TMT and demonstrated that TNFalpha stimulates Snn gene expression in a protein kinase C epsilon-dependent manner in HUVECs in response to TMT exposure. Supporting this, we show that TMT-induced toxicity is significantly blocked by pretreatment with an anti-TNFalpha antibody in HUVECs. Using a quantitative real-time polymerase chain reaction assay, we also show that the level of Snn gene expression is significantly increased in HUVECs in response to either TMT or TNFalpha treatment. This TNFalpha-induced Snn gene expression is blocked when HUVECs were pretreated with bisindolylmaleimide I, an inhibitor of protein kinase C (PKC). In contrast, when HUVECs were treated with phorbol 12-myristate 13-acetate, a PKC activator, we observed a significant increase in Snn gene expression. Using isotype-specific siRNA against PKC, we further show that knockdown of PKC epsilon, but not PKC delta or PKC zeta, significantly blocked TNFalpha-induced Snn gene expression. Together, these results indicate that TNFalpha-induced, PKC epsilon-dependent Snn expression may be a critical factor in TMT-induced cytotoxicity." @default.
- W2219005311 created "2016-06-24" @default.
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- W2219005311 date "2005-03-29" @default.
- W2219005311 modified "2023-10-12" @default.
- W2219005311 title "Protein Kinase Cϵ Regulates Tumor Necrosis Factor-α-Induced Stannin Gene Expression" @default.
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- W2219005311 doi "https://doi.org/10.1124/jpet.105.084236" @default.
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