Aberrant Rheb-mediated mTORC1 activation and Pten haploinsufficiency are cooperative oncogenic events.

Genes & Development
Caterina NardellaPier Paolo Pandolfi

Abstract

The mammalian target of rapamycin (mTOR) represents a critical signaling crossroad where pathways commonly disrupted in cancer converge. We report here that Rheb GTPase, the upstream activator of the mTOR complex 1 (mTORC1) is amplified in human prostate cancers. We demonstrate that Rheb overexpression promotes hyperplasia and a low-grade neoplastic phenotype in the mouse prostate while eliciting a concomitant senescence response and a negative feedback loop limiting Akt activation. Importantly, we show that Pten haploinsufficiency cooperates with Rheb overexpression to markedly promote prostate tumorigenesis. We conclude that Rheb acts as a proto-oncogene in the appropriate genetic milieu and signaling context.

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