PtdIns(3,4,5)P₃-dependent Rac exchanger 1 (P-Rex1) promotes mammary tumor initiation and metastasis.

ABSTRACT: The Rac-GEF, P-Rex1, activates Rac1 signaling downstream of G protein-coupled receptors and PI3K. Increased P-Rex1 expression promotes melanoma progression; however, its role in breast cancer is complex, with differing reports of the effect of its expression on disease outcome. To address this we analyzed human databases, undertook gene array expression analysis, and generated unique murine models of P-Rex1 gain or loss of function. Analysis of PREX1 mRNA expression in breast cancer cDNA arrays and a METABRIC cohort revealed that higher PREX1 mRNA in ER^+ve/luminal tumors was associated with poor outcome in luminal B cancers. Prex1 deletion in MMTV-neu or MMTV-PyMT mice reduced Rac1 activation in vivo and improved survival. High level MMTV-</

SUBMITTER: Srijakotre N 

PROVIDER: S-EPMC7668035 | biostudies-literature | 2020 Nov

REPOSITORIES: biostudies-literature