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Pleckstrin homology domain-containing protein PHLDB3 supports cancer growth via a negative feedback loop involving p53.

ABSTRACT: The tumour suppressor p53 transactivates the expression of its target genes to exert its functions. Here, we identify a pleckstrin homology domain-containing protein (PHLDB3)-encoding gene as a p53 target. PHLDB3 overexpression increases proliferation and restrains apoptosis of wild-type p53-harboring cancer cells by reducing p53 protein levels. PHLDB3 binds to MDM2 (mouse double minute 2 homolog) and facilitates MDM2-mediated ubiquitination and degradation of p53. Knockdown of PHLDB3 more efficiently inhibits the growth of mouse xenograft tumours derived from human colon cancer HCT116 cells that contain wild type p53 compared with p53-deficient HCT116 cells, and also sensitizes tumour cells to doxorubicin and 5-Fluorouracil. Analysis of cancer genomic databases reveals that PHLDB3 is amplified and/or highly expressed in numerous human cancers. Altogether, these results demonstrate that PHLDB3 promotes tumour growth by inactivating p53 in a negative feedback fashion and suggest PHLDB3 as a potential therapeutic target in various human cancers.

SUBMITTER: Chao T 

PROVIDER: S-EPMC5196188 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature

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Pleckstrin homology domain-containing protein PHLDB3 supports cancer growth via a negative feedback loop involving p53.

Chao Tengfei T   Zhou Xiang X   Cao Bo B   Liao Peng P   Liu Hongbing H   Chen Yun Y   Park Hee-Won HW   Zeng Shelya X SX   Lu Hua H  

Nature communications 20161223

The tumour suppressor p53 transactivates the expression of its target genes to exert its functions. Here, we identify a pleckstrin homology domain-containing protein (PHLDB3)-encoding gene as a p53 target. PHLDB3 overexpression increases proliferation and restrains apoptosis of wild-type p53-harboring cancer cells by reducing p53 protein levels. PHLDB3 binds to MDM2 (mouse double minute 2 homolog) and facilitates MDM2-mediated ubiquitination and degradation of p53. Knockdown of PHLDB3 more effic  ...[more]

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