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• W2048694820 abstract "High-mobility group A1 (HMGA1) overexpression and gene rearrangement are frequent events in human cancer, but the molecular basis of HMGA1 oncogenic activity remains unclear. Here we describe a mechanism through which HMGA1 inhibits p53-mediated apoptosis by counteracting the p53 proapoptotic activator homeodomain-interacting protein kinase 2 (HIPK2). We found that HMGA1 overexpression promoted HIPK2 relocalization in the cytoplasm and inhibition of p53 apoptotic function, while HIPK2 overexpression reestablished HIPK2 nuclear localization and sensitivity to apoptosis. HIPK2 depletion by RNA interference suppressed the antiapoptotic effect of HMGA1, which indicates that HIPK2 is the target required for HMGA1 to repress the apoptotic activity of p53. Consistent with this process, a strong correlation among HMGA1 overexpression, HIPK2 cytoplasmic localization, and low spontaneous apoptosis index (comparable to that observed in mutant p53–carrying tumors) was observed in WT p53–expressing human breast carcinomas. Hence, cytoplasmic relocalization of HIPK2 induced by HMGA1 overexpression is a mechanism of inactivation of p53 apoptotic function that we believe to be novel." @default.
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• W2048694820 date "2007-03-01" @default.
• W2048694820 modified "2023-10-16" @default.
• W2048694820 title "High-mobility group A1 inhibits p53 by cytoplasmic relocalization of its proapoptotic activator HIPK2" @default.
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• W2048694820 doi "https://doi.org/10.1172/jci29852" @default.
• W2048694820 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3809819" @default.
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