Decreased Egr-1 expression in human, mouse and rat mammary cells and tissues correlates with tumor formation.

Abstract:

:We have examined several types of tumor cell lines and shown that they invariably expressed little or no Egr-1, in contrast to their normal counterparts. We have previously shown that the expression of exogenous Egr-1 in human breast and other tumor cells markedly reduces transformed growth and tumorigenicity. We therefore hypothesized that the loss of Egr-1 expression plays a role in transformation. All human and mouse breast cancer cell lines and tumors examined had reduced Egr-1 expression compared with their normal counterparts. Reduced Egr-1 expression was also observed in 7,12-dimethylbenz(a)anthracene (DMBA)-induced rat mammary tumors, and this level increased to normal levels in tumors that regressed after tamoxifen treatment. We concluded, therefore, that loss of Egr-1 expression may play a role in the deregulation of normal growth in the tumorigenic process and that Egr-1 acts as a tumor suppressor gene.

journal_name

Int J Cancer

authors

Huang RP,Fan Y,de Belle I,Niemeyer C,Gottardis MM,Mercola D,Adamson ED

doi

10.1002/(sici)1097-0215(19970703)72:1<102::aid-ijc

subject

Has Abstract

pub_date

1997-07-03 00:00:00

pages

102-9

issue

1

eissn

0020-7136

issn

1097-0215

pii

10.1002/(SICI)1097-0215(19970703)72:1<102::AID-IJC

journal_volume

72

pub_type

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