Adenomatous polyposis coli localization is both cell type and cell context dependent

The adenomatous polyposis coli (APC) tumor suppressor protein is mutated in most colorectal carcinomas. In addition to its role in WNT signaling it is proposed to be involved in both cell migration and mitosis. Although a variety of studies have shown an APC localization along lateral membranes of a...

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Bibliographic Details
Published in:Cell motility and the cytoskeleton 2006-08, Vol.63 (8), p.483-492
Main Authors: Langford, K. J., Lee, T., Askham, J. M., Morrison, E. E.
Format: Article
Language:English
Subjects:
actin
Adenomatous Polyposis Coli Protein - metabolism
Alternative Splicing
Animals
APC
Cell Adhesion - physiology
Cell Line
Epithelial Cells - cytology
Epithelial Cells - metabolism
Fibroblasts - cytology
Fibroblasts - metabolism
junctions
microtubule
Microtubules - metabolism
Protein Isoforms
Rats
Spindle Apparatus - metabolism
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Summary:The adenomatous polyposis coli (APC) tumor suppressor protein is mutated in most colorectal carcinomas. In addition to its role in WNT signaling it is proposed to be involved in both cell migration and mitosis. Although a variety of studies have shown an APC localization along lateral membranes of adjacent epithelial cells the existence of a cortical APC localization in mammalian cells remains controversial. To address this we have used matched rat epithelial (NRK‐52E) and fibroblast (NRK‐49F) cell lines to investigate the localization of APC. Subconfluent cultures of NRK‐52E and ‐49F cells displayed microtubule‐associated APC populations by immunostaining. However, confluent NRK‐52E, but not ‐49F monolayers, exhibited a cortical APC distribution. Cortical APC localized in close proximity to a number of cell junction proteins in a microtubule‐independent manner while calcium switch experiments suggested that APC was recruited to the cortex only when junction assembly was complete. Confluent NRK‐49F and ‐52E cells also showed contrasting APC localizations in response to monolayer wounding. Our data suggests APC cortical localization is a feature of confluent epithelioid cells and that the subcellular distribution of APC is therefore dependent upon both cell type and context. Cell Motil. Cytoskeleton 2006. © 2006 Wiley‐Liss, Inc.
ISSN:0886-1544
1097-0169
DOI:10.1002/cm.20139