beta-catenin inhibits promyelocytic leukemia protein tumor suppressor function in colorectal cancer cells.
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Satow R, Shitashige M, Jigami T, Fukami K, Honda K, Kitabayashi I, Yamada T
beta-catenin inhibits promyelocytic leukemia protein tumor suppressor function in colorectal cancer cells.
Gastroenterology. 2012 Mar;142(3):572-81. doi: 10.1053/j.gastro.2011.11.041. Epub 2011 Dec 9.
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- 22155184 [ View in PubMed]
- Abstract
BACKGROUND & AIMS: Loss of promyelocytic leukemia protein (PML) nuclear body (NB) formation has been reported in colorectal and other solid tumors. However, genetic alteration of PML is rarely observed in these tumors; the exact mechanisms that mediate loss of PML function are not known. METHODS: We previously used a comprehensive shotgun mass spectrometry approach to identify PML as 1 of 70 proteins that coimmunoprecipitate with anti-T-cell factor 4 in DLD-1 and HCT116 colorectal cancer cell lines; we investigated the effects of altered beta-catenin expression on PML function in these cells. RESULTS: beta-catenin specifically interacted with the product of PML transcript variant IV (PML-IV) through the armadillo repeat domain of beta-catenin. Overexpression of beta-catenin in colorectal cancer cells disrupted the subcellular compartmentalization of PML-IV, whereas knockdown of beta-catenin restored formation of PML-NB. Modification of PML by the small ubiquitin-related modifier (SUMO) is required for proper assembly of PML-NB. beta-catenin inhibited Ran-binding protein 2-mediated SUMOylation of PML-IV. CONCLUSIONS: beta-catenin interacts with PML isoform IV and disrupts PML-IV function and PML-NB formation by inhibiting Ran-binding protein 2-mediated SUMO modification of PML-IV. These findings indicate the involvement of a posttranslational mechanism in disruption of PML-NB organization in cancer cells and provide more information about the oncogenic functions of beta-catenin.