Document Detail

Differential regulation of two forms of gonadotropin-releasing hormone messenger ribonucleic acid by gonadotropins in human immortalized ovarian surface epithelium and ovarian cancer cells.
MedLine Citation:
PMID:  16728589     Owner:  NLM     Status:  MEDLINE    
Although gonadotropin-releasing hormone (GnRH) has been shown to play a role as an autocrine/ paracrine regulator of cell growth in ovarian surface epithelium and ovarian cancer, the factors which regulate the expression of GnRH and its receptor in these cells are not well characterized. In the present study, we employed real-time PCR to determine the potential regulatory effect of gonadotropins on the expression levels of GnRH I (the mammalian GnRH), GnRH II (a second form of GnRH) and their common receptor (GnRHR) in immortalized ovarian surface epithelial (IOSE-80 and IOSE-80PC) cells and ovarian cancer cell lines (A2780, BG-1, CaOV-3, OVCAR-3 and SKOV-3). The cells were treated with increasing concentrations (100 and 1000 ng/ml) of recombinant follicle-stimulating hormone (FSH) or luteinizing hormone (LH) for 24 h. Treatment with FSH or LH reduced GnRH II mRNA levels in both IOSE cell lines and in three out of five ovarian cancer cell lines (A2780, BG-1 and OVCAR-3). A significant decrease in GnRHR mRNA levels was observed in IOSE and ovarian cancer cells, except CaOV-3 cells, following treatment with FSH or LH. In contrast, treatment with either FSH or LH had no effect on GnRH I mRNA levels in these cells, suggesting that gonadotropins regulate the two forms of GnRH and its receptor differentially. In separate experiments, the effect of gonadotropins on the anti-proliferative action of GnRH I and GnRH II agonists in IOSE-80, OVCAR-3 and SKOV-3 cells was investigated. The cells were pretreated with FSH or LH (100 ng/ml) for 24 h after which they were treated with either GnRH I or GnRH II (100 ng/ml) for 2 days, and cell growth was assessed by the MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazoliumbromide] assay. Pretreatment of the cells with FSH or LH significantly reversed the growth inhibitory effect of GnRH I and GnRH II agonists in these cell types. These results provide the first demonstration of a potential interaction between gonadotropins and the GnRH system in the growth regulation of normal ovarian surface epithelium and its neoplastic counterparts.
Jung-Hye Choi; Kyung-Chul Choi; Nelly Auersperg; Peter C K Leung
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Endocrine-related cancer     Volume:  13     ISSN:  1351-0088     ISO Abbreviation:  Endocr. Relat. Cancer     Publication Date:  2006 Jun 
Date Detail:
Created Date:  2006-05-26     Completed Date:  2006-08-16     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9436481     Medline TA:  Endocr Relat Cancer     Country:  England    
Other Details:
Languages:  eng     Pagination:  641-51     Citation Subset:  IM    
Department of Obstetrics and Gynecology, British Columbia Children's and Women's Hospital, Child and Family Research Institute, University of British Columbia, 2H-30, 4490 Oak St, Vancouver, British Columbia, Canada, V6H 3V5.
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MeSH Terms
Epithelium / drug effects,  metabolism
Follicle Stimulating Hormone / pharmacology*,  physiology
Gene Expression Regulation / drug effects*
Gonadotropin-Releasing Hormone / genetics*
Gonadotropins / pharmacology,  physiology
Luteinizing Hormone / pharmacology*,  physiology
Ovarian Neoplasms / genetics*,  metabolism
Ovary / drug effects,  metabolism
RNA, Messenger / metabolism
RNA, Neoplasm / metabolism
Receptors, Neuropeptide / agonists,  genetics
Reverse Transcriptase Polymerase Chain Reaction
Tumor Cells, Cultured
Reg. No./Substance:
0/Gonadotropins; 0/RNA, Messenger; 0/RNA, Neoplasm; 0/Receptors, Neuropeptide; 33515-09-2/Gonadotropin-Releasing Hormone; 9002-67-9/Luteinizing Hormone; 9002-68-0/Follicle Stimulating Hormone

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