The mammalian COP9 signalosome (CSN) complex is involved in cell transformation, but its molecular mechanism remains undetermined. Here we show that disruption of the fifth component (CSN5) prevented the formation of tumors by p53-null cells transformed with an active form of Ras in subcutaneously injected mice. Depletion of CSN5 suppressed cell proliferation, and induced premature senescence characterized by upregulation of senescence-associated-β-galactosidase activity and increased expression of CDK inhibitors. CSN5-depleted cells exhibited enhanced activation of the PI3 kinase-Akt pathway, and chemical inhibition of this pathway reduced the level of senescence. Thus, CSN5 is suggested to be a novel target in cancer therapy and for drugs against tumor cells harboring mutated p53.
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