To elucidate cellular pathways involved in Jun-NH-terminal kinase (JNK) activation by different forms of stress, we have compared the effects of UV irradiation, heat shock, and HO. Using mouse fibroblast cells (3T3-4A) we show that while HO is ineffective, UV and heat shock (HS) are potent inducers of JNK. The cellular pathways that mediate JNK activation after HS or UV exposure are distinctly different as can be concluded from the following observations: (i) HO is a potent inhibitor of HS-induced but not of UV-induced JNK activation; (ii) Triton X-100-treated cells abolish the ability of UV, but not HS, to activate JNK; (iii) the free radical scavenger N-acetylcysteine inhibits UV- but not HS-mediated JNK activation; (iv) N-acetylcysteine inhibition is blocked by HO in a dose-dependent manner; (v) a Cockayne syndrome-derived cell line exhibits JNK activation upon UV exposure, but not upon HS treatment. The significance of Jun phosphorylation by JNK after treatment with UV, HS, or HO was evaluated by measuring Jun phosphorylation in vivo and also its binding activity in gel shifts. HS and UV, which are potent inducers of JNK, increased the level of c-Jun phosphorylation when this was measured by [P]orthophosphate labeling of 3T3-4A cultures. HO had no such effect. Although HO failed to activate JNK in vitro and to phosphorylate c-Jun in vivo, all three forms of stress were found to be potent inducers of binding to the AP1 target sequence. Overall, our data indicate that both membrane-associated components and oxidative damage are involved in JNK activation by UV irradiation, whereas HS-mediated JNK activation, which appears to be mitochondrial-related, utilizes cellular sensors.

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