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Bone Morphogenetic Protein 5 Expression in the Rat Ovary: Biological Effects on Granulosa Cell Proliferation and Steroidogenesis¹

Physiologie de la Reproduction et des Comportements, UMR 6175 INRA-CNRS-Université F. Rabelais de Tours Haras Nationaux, 37380 Nouzilly, France

ABSTRACT

Recently, the role of several elements of the bone morphogenetic protein (BMP) family has been studied in the ovary, some of them being crucial for ovarian function. In the present work, we have studied bone morphogenetic protein 5 (BMP5) expression and its biological role in the rat ovary. BMP5 is expressed by rat granulosa cells (GCs) and exerts specific biological effects on proliferation and steroidogenesis of these cells in an autocrine manner. These effects were shown to be associated with an increase in cyclin D2 protein level and a decrease in steroidogenic acute regulatory (StAR) protein expression in GCs in vitro. Ultimately, BMP5 actions were inhibited by follistatin. Overall, these data show that BMP5 is a novel element of the BMP family that might play a fully paracrine role in rodent ovarian folliculogenesis.

BMP5, follicle-stimulating hormone, granulosa cells, ovary, progesterone, rat

¹ Supported by Institut National de la Recherche Agronomique. A.P. was supported by a fellowship from Institut National de la Recherche Agronomique and Région Centre.

² Correspondence: Philippe Monget, Physiologie de la Reproduction et des Comportements, UMR 6175 INRA-CNRS-Université F. Rabelais de Tours Haras Nationaux, 37380 Nouzilly, France. FAX: 33 2 47 42 77 43; monget{at}tours.inra.fr

³ Deceased.

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