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 Cancerjournal_title
International journal of cancerauthors
Huang RP,Fan Y,de Belle I,Niemeyer C,Gottardis MM,Mercola D,Adamson EDdoi
10.1002/(sici)1097-0215(19970703)72:1<102::aid-ijcsubject
Has Abstractpub_date
1997-07-03 00:00:00pages
102-9issue
1eissn
0020-7136issn
1097-0215pii
10.1002/(SICI)1097-0215(19970703)72:1<102::AID-IJCjournal_volume
72pub_type
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