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Activation of the signaling pathways leading to gene expression regulation is critical in the carcinogenic effects of nickel exposure. In the present study, we found nickel exposure could induce cyclooxygenase-2 (COX-2) expression at transcriptional and protein levels in both human bronchoepithelial cells (Beas-2B) and murine embryonic fibroblasts (MEFs). We further provided direct evidence for the specific involvement of the JNK1 signaling pathway in the COX-2 induction using specific gene knockout approaches. Our results demonstrated that COX-2 induction by nickel was impaired in JNK1(-/-) MEFs, but not in JNK2(-/-) MEFs. Moreover, re-constitutional expression of JNK1 restored COX-2 induction, confirming the specific requirement of JNK1 in COX-2 induction. Further investigation revealed that JNK1 mediated the nickel-induced COX-2 expression in a c-Jun/AP-1-dependent manner. Ectopic expression of TAM67, a c-Jun dominant negative mutant, also suppressed the COX-2 induction. Our results demonstrate that the JNK1/c-Jun/AP-1 pathway, but not the JNK2 pathway, plays a critical role in nickel-induced COX-2 expression.

JNK1, but not JNK2, is required for COX-2 induction by nickel compounds