Lipid rafts remodeling in estrogen receptor-negative breast cancer is reversed by histone deacetylase inhibitor

Molecular Cancer Therapeutics
Anna OstapkowiczJozef Spychala

Abstract

Recently, we have found dramatic overexpression of ecto-5'-nucleotidase (or CD73), a glycosylphosphatidylinositol-anchored component of lipid rafts, in estrogen receptor-negative [ER-] breast cancer cell lines and in clinical samples. To find out whether there is a more general shift in expression profile of membrane proteins, we undertook an investigation on the expression of selected membrane and cytoskeletal proteins in aggressive and metastatic breast cancer cells. Our analysis revealed a remarkably uniform shift in expression of a broad range of membrane, cytoskeletal, and signaling proteins in ER- cells. A similar change was found in two in vitro models of transition to ER- breast cancer: drug-resistant Adr2 and c-Jun-transformed clones of MCF-7 cells. Interestingly, similar expression pattern was observed in normal fibroblasts, suggesting the commonality of membrane determinants of invasive cancer cells with normal mesenchymal phenotype. Because a number of investigated proteins are components of lipid rafts, our results suggest that there is a major remodeling of lipid rafts and underlying cytoskeleton in ER- breast cancer. To test whether this broadly defined ER- phenotype could be reversed by treatment with differenti...Continue Reading

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Citations

Jun 26, 2007·Clinical & Experimental Metastasis·Xiuling ZhiLianhua Yin
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