JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Cytoplasmic ASPP1 inhibits apoptosis through the control of YAP.

Genes & Development 2010 November 2
The ASPP (apoptosis-stimulating protein of p53) family of proteins can function in the nucleus to modulate the transcriptional activity of p53, with ASPP1 and ASPP2 contributing to the expression of apoptotic target genes. In this study, we describe a new function for cytoplasmic ASPP1 in controlling YAP (Yes-associated protein)/TAZ. ASPP1 can inhibit the interaction of YAP with LATS1 (large tumor suppressor 1), a kinase that phosphorylates YAP/TAZ and promotes cytoplasmic sequestration and protein degradation. This function of ASPP1 therefore enhances nuclear accumulation of YAP/TAZ and YAP/TAZ-dependent transcriptional regulation. The consequence of YAP/TAZ activation by ASPP1 is to inhibit apoptosis, in part through the down-regulation of Bim expression, leading to resistance to anoikis and enhanced cell migration. These results reveal a potential oncogenic role for cytoplasmic ASPP1, in contrast to the tumor-suppressive activity described previously for nuclear ASPP1.

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