Activation of NF-kappaB by antineoplastic agents. Role of protein kinase C.

The Journal of Biological Chemistry
K C Das, C W White

Abstract

Paclitaxel can induce tumor necrosis factor (TNF) and interleukin-1 gene expression, similar to lipopolysaccharides. Since lipopolysaccharide-induced expression of TNF is related to activation of NF-kappaB, we determined whether NF-kappaB could be activated by paclitaxel. In the human lung adenocarcinoma cell line A549, paclitaxel activated NF-kappaB in a dose-dependent manner with maximal activation after 2-4 h. Since paclitaxel could up-regulate TNF and interleukin-1 secretion and subsequent NF-kappaB activation could be caused by these cytokines, the effect of two other groups of anticancer drugs including vinca alkaloids (vinblastine and vincristine) and anthracyclines (daunomycin and doxorubicin), neither of which induce TNF or interleukin-1 gene expression, were examined. Like paclitaxel, vinblastine, vincristine, daunomycin, and doxorubicin each caused activation of NF-kappaB. Therefore, it is unlikely that activation of NF-kappaB caused by these agents or by paclitaxel is mediated via cytokine up-regulation. Furthermore, actinomycin D and cycloheximide, inhibitors of transcription and translation, respectively, did not inhibit paclitaxel-induced NF-kappaB activation. Several other transcription factors such as AP-1, AP-...Continue Reading

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