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DOI: 10.1055/s-2001-14938
Gene Amplification and Expression of the Steroid Receptor Coactivator SRC3 (AIB1) in Sporadic Breast and Endometrial Carcinomas
Publication History
Publication Date:
31 December 2001 (online)
Steroid receptor coactivator 3 (SRC3) functions as a coactivator for nuclear receptor mediated transcriptional activation. It binds to nuclear receptors in a ligand-dependent fashion and recruits other factors such as CBP and p300 to the transactivation complex. Due to its function as activator of nuclear receptors, overexpression of SRC3 might enhance their effects. Gene amplification is a common mechanism that causes overexpression, already described for oncogenes like c-erbB2, c-myc and int2. In this study, SRC3 gene amplification and expression levels were analyzed in 127 sporadic breast carcinomas, 30 endometrial carcinomas and different cell lines (MCF7, HeLa, Ishikawa, T47D, BT-20, SK-BR-3, HEC-1a, RL 95 - 2, OVCAR3 and A-431). To determine gene amplification and mRNA expression levels, quantitative differential PCR and RT-PCR were performed in combination with fluorescent DNA technology. Gene amplification was not found in any of the breast and endometrial carcinomas, but was found in the carcinoma cell lines MCF7 (10-fold) and HeLa (3-fold). SRC3 overexpression was detected in 13 % (3/23) of breast carcinomas and 17 % (5/30) of endometrial carcinomas, as well as in MCF7 and HeLa cells. Thus, SRC3 overexpression found in breast and endometrial tumors is not caused by SRC3 gene amplification. A carcinogenic potential provided by SRC3 overexpression has to be elucidated in further studies.
Key words:
Estrogen Receptor - Progesterone Receptor - Overexpression - pdPCR - Transcription Activation
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Dr. D. Niederacher
Department of Gynecology and Obstetrics
Heinrich-Heine-University
Molekulargenetisches Labor
Moorenstrasse 5
40225 Duesseldorf
Germany
Phone: Phone:+ 49 (211) 81-15319
Fax: Fax:+ 49 (211) 81-15319
Email: E-mail:niederac@uni-duesseldorf.de