The mammalian UV response: c-Jun induction is required for exit from p53-imposed growth arrest - PubMed (original) (raw)

The mammalian UV response: c-Jun induction is required for exit from p53-imposed growth arrest

E Shaulian et al. Cell. 2000.

Free article

Abstract

The mammalian UV response results in rapid and dramatic induction of c-jun. Induction of a protooncogene, normally involved in mitogenic responses, by a genotoxic agent that causes growth arrest seems paradoxical. We now provide an explanation for the role of c-Jun in the UV response of mouse fibroblasts. c-Jun is necessary for cell-cycle reentry of UV-irradiated cells, but does not participate in the response to ionizing radiation. Cells lacking c-Jun undergo prolonged cell-cycle arrest, but resist apoptosis, whereas cells that express c-Jun constitutively do not arrest and undergo apoptosis. This function of c-Jun is exerted through negative regulation of p53 association with the p21 promoter. Cells lacking c-Jun exhibit prolonged p21 induction, whereas constitutive c-Jun inhibits UV-mediated p21 induction.

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The mammalian UV response: c-Jun induction is required for exit from p53-imposed growth arrest - PubMed (original) (raw)