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- Title
Density-dependent location and interactions of truncated APC and ß-catenin.
- Authors
Davies, Melanie L.; Roberts, Gwyndaf T.; Spiller, David G.; Wakeman, Jane A.
- Abstract
Adenomatous polyposis coli (APC) is a multifunctional tumour suppressor protein, central to development and the mature organism. It is mutated in most cases of colorectal cancer, rendering it ineffective in mediating ß-catenin degradation. We show that localization of full-length APC in colon carcinoma and noncancer cell lines is independent of cell density. However, the location of truncated APC is a function of cell density and in high-density cells truncated APC is predominantly not nuclear. Although the distribution of truncated APC and ß-catenin is closely linked in subconfluent SW480 cells, at high cell density they are not colocalized. We postulated that in this cell line this could be due to an increase in ß-catenin bound to E-cadherin with formation of adherens junctions at high cell density. However, while in coimmunoprecipitation assays we observe an increase in binding between ß-catenin and E-cadherin and a corresponding decrease in binding between ß-catenin and APC at high cell density, we did not observe a strict colocalization of ß-catenin and E-cadherin at the membrane of all cells.Oncogene (2004) 23, 1412-1419. doi:10.1038/sj.onc.1207266 Published online 1 December 2003
- Subjects
TUMOR suppressor proteins; CANCER invasiveness; AFFERENT pathways; CELL lines; CELL adhesion; PHYSIOLOGY
- Publication
Oncogene, 2004, Vol 23, Issue 7, p1412
- ISSN
0950-9232
- Publication type
Article
- DOI
10.1038/sj.onc.1207266