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Department of Molecular and Cellular Biology, Baylor College of Medicine (M.H., J.S.R.), Houston, Texas 77030; Research and Development, NV Organon (S.M.M.), 5340 BH Oss, The Netherlands; University of Western Australia School of Anatomy and Human Biology (A.D.), Crawley, Western Australia 6009, Australia; West Australian Institute of Medical Research, Sir Charles Gairdner Hospital (A.D.), Shenton Park, Western Australia 6009, Australia; and Department of Clinical Research, University of Bern (R.R.F.), CH-3010 Bern, Switzerland
Address all correspondence and requests for reprints to: Dr. JoAnne S. Richards, Department of Molecular and Cellular Biology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030. E-mail: joanner{at}bcm.tmc.edu.
Secreted frizzled-related protein-4 (sFRP-4) belongs to a family of soluble proteins that have a Frizzled-like cysteine-rich domain and function as modulators of Wnt-Frizzled (Fz) signals. As several Wnts and Fz are expressed at defined stages of follicular development in rodent ovaries, these studies were undertaken to evaluate the hormone-regulated expression and localization of sFRP-4. In the mouse ovary, the expression of sFRP-4 mRNA was up-regulated in granulosa cells of large antral follicles after human chorionic gonadotropin administration and was also elevated in corpora lutea, as determined by RT-PCR and in situ hybridization analyses. In hypophysectomized rat ovaries, sFRP-4 expression was similarly induced by human chorionic gonadotropin and further up-regulated by PRL. PRL also stimulated the secretion of sFRP-4 protein from luteinized rat granulosa cells in culture. Therefore, regulation of sFRP-4 by LH and PRL may be important for modulating Fz-1, which is known to be expressed in periovulatory follicles, and Wnt-4/Fz-4, which are expressed in corpora lutea.
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