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Gastroenterology. 2012 Mar;142(3):572-81. doi: 10.1053/j.gastro.2011.11.041. Epub 2011 Dec 9.

β-catenin inhibits promyelocytic leukemia protein tumor suppressor function in colorectal cancer cells.

Author information

1
Division of Chemotherapy and Clinical Research, National Cancer Center Research Institute, Tokyo, Japan.

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 β-catenin expression on PML function in these cells.

RESULTS:

β-catenin specifically interacted with the product of PML transcript variant IV (PML-IV) through the armadillo repeat domain of β-catenin. Overexpression of β-catenin in colorectal cancer cells disrupted the subcellular compartmentalization of PML-IV, whereas knockdown of β-catenin restored formation of PML-NB. Modification of PML by the small ubiquitin-related modifier (SUMO) is required for proper assembly of PML-NB. β-catenin inhibited Ran-binding protein 2-mediated SUMOylation of PML-IV.

CONCLUSIONS:

β-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 β-catenin.

PMID:
22155184
DOI:
10.1053/j.gastro.2011.11.041
[Indexed for MEDLINE]

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