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Cell Growth & Differentiation, Vol 8, Issue 7 773-778, Copyright © 1997 by American Association of Cancer Research


ARTICLES

Transcriptional defects underlie loss of E-cadherin expression in breast cancer

X Ji, AS Woodard, DL Rimm and ER Fearon
Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor 48109-0638, USA.

Decreased expression of E-cadherin (E-cad), a calcium-dependent cell adhesion molecule, has been seen in many different epithelial cancers. Although somatic mutations in the E-cad gene have been identified in a small subset of tumors, in the majority of cancers, the mechanisms underlying loss of E-cad expression are poorly understood. We have cloned the human E-cad promoter and defined its critical components in functional assays. In eight human breast cancer cell lines, there was a striking correlation between endogenous E-cad gene expression and E-cad promoter activity observed following the introduction of reporter gene constructs into the lines. These and other observations suggest that defects in trans-acting pathways regulation E-cad expression are the primary basis for the loss of its expression in most breast cancers. The results have significant implications for understanding the gene expression differences that underlie tumor heterogeneity and progression events in breast and other epithelial cancers.


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HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1997 by the American Association of Cancer Research.