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Cancer Cell International
Published in: Cancer Cell International 1/2012

Open Access 01-12-2012 | Primary research

Caveolin-1 expression is elevated in claudin-low mammary tumor cells

Authors: Devan E Thompson, Megan D Siwicky, Roger A Moorehead

Published in: Cancer Cell International | Issue 1/2012

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Abstract

Background

Caveolin-1 is a scaffolding protein found in plasma membrane invaginations known as caveolae. Caveolin-1 can regulate a number of intracellular processes such as signal transduction, cholesterol metabolism and vesicular transport. With respect to breast cancer caveolin-1 has been observed in both tumor cells and stromal cells surrounding tumors however most of the recent research has focused on how the loss of caveolin-1 in the stromal cells surrounding the tumor alters the tumor microenvironment.

Methods

Caveolin-1 expression was evaluated in (1) mammary tumors induced by the transgenic overexpression of the type I insulin-like growth factor receptor (IGF-IR), (2) mammary tumors that became independent of IGF-IR signalling and acquired a claudin-low genotype, (3) two murine mammary epithelial tumor cell lines and (4) two murine mammary claudin-low tumor cell lines.

Results

We found that mammary tumors induced by IGF-IR overexpression expressed low levels of caveolin-1 while mammary tumors that became independent of IGF-IR signalling expressed considerably higher levels of caveolin-1. Interestingly, pockets of caveolin-1 positive cells could be observed in some of the IGF-IR-induced mammary tumors and these caveolin-1 positive cells were associated with tumor cells that expressed basal cytokeratins (cytokeratins 5 and 14). This caveolin-1 expression pattern was maintained in the murine mammary tumor cell lines in that the epithelial mammary tumor cell lines expressed little or no caveolin-1 while the claudin-low cell lines expressed caveolin-1.

Conclusions

Our model indicates that mammary tumor cells with epithelial characteristics lack caveolin-1 while mesenchymal tumor cells express caveolin-1 suggesting that caveolin-1 may serve as a marker of mammary tumor cells with mesenchymal characteristics such as claudin-low breast tumors.
Appendix
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Metadata
Title
Caveolin-1 expression is elevated in claudin-low mammary tumor cells
Authors
Devan E Thompson
Megan D Siwicky
Roger A Moorehead
Publication date
01-12-2012
Publisher
BioMed Central
Published in
Cancer Cell International / Issue 1/2012
Electronic ISSN: 1475-2867
DOI
https://doi.org/10.1186/1475-2867-12-6

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