Mol. Hum. Reprod. Advance Access originally published online on August 26, 2005
Molecular Human Reproduction 2005 11(8):537-542; doi:10.1093/molehr/gah203
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Expression and regulation of Sprouty-2 in the granulosa-lutein cells of the corpus luteum
1Department of Obstetrics and Gynecology, 2Department of Pathology, Hadassah University Medical Center and 3Department of Clinical Pharmacology, The Hebrew University, Jerusalem, Israel
4 To whom correspondence should be addressed at: Department of Obstetrics and Gynecology, The Division of Reproductive Endocrinology and Infertility, Hadassah Hebrew University Medical Center, Mt. Scopus, P.O.Box 24035, Jerusalem 91240, Israel. E-mail: hurwitz{at}cc.huji.ac.il
Growth factor signalling has important modulatory roles in the process of human follicular growth, oocyte maturation and corpus luteum (CL) formation. Recently, Sprouty-2, an inhibitor of receptor tyrosine kinase (RTK) signalling pathway was advocated as a marker of oocyte competence in the bovine ovary. We sought to study Sprouty-2 expression and regulation in the human ovary. RTPCR was used to detect Sprouty-2 mRNA in human granulosa-lutein cells (GLC) collected from follicular aspiration of IVF patients. The effect of epidermal and fibroblast growth factors (EGF and FGF) on Sprouty-2 mRNA expression in GLC was studied using quantitative real-time PCR. Immunohistochemistry was performed on cultured GLC, human CL and stimulated rat ovary sections. Sprouty-2 mRNA was expressed in human GLC. EGF and basic FGF, but not FGF4 and FGF10, increased Sprouty-2 mRNA expression in GLC. The Sprouty protein was localized to GLC of early and late human CL but not to the theca cell layer. Immunostaining of developing rat CL confirmed the temporal and spatial expression of Sprouty in humans. The detection of Sprouty-2 mRNA and protein in human GLC may suggest a role for Sprouty-2 during the final stages of follicle maturation and CL formation.
Key words: corpus luteum/follicle/granulosa/ovary/Sprouty
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