Growth differentiation factor 9 regulates expression of the bone morphogenetic protein antagonist gremlin.
Growth differentiation factor 9 (GDF9) is an oocyte-expressed member of the transforming growth factor beta (TGF-beta) superfamily and is required for normal ovarian follicle development and female fertility. GDF9 acts as a paracrine factor and affects granulosa cell physiology. Only a few genes regulated by GDF9 are known. Our microarray analysis has identified gremlin as one of the genes up-regulated by GDF9 in cultures of granulosa cells. Gremlin is a known member of the DAN family of bone morphogenetic protein (BMP) antagonists, but its expression and function in the ovary are unknown. We have investigated the regulation of gremlin in mouse granulosa cells by GDF9 as well as other members of the TGF-beta superfamily. GDF9 and BMP4 induce gremlin, but TGF-beta does not. In addition, in cultures of granulosa cells, gremlin negatively regulates BMP4 signaling but not GDF9 activity. The expression of gremlin in the ovary was also examined by in situ hybridization. A distinct change in gremlin mRNA compartmentalization occurs during follicle development and ovulation, indicating a highly regulated expression pattern during folliculogenesis. We propose that gremlin modulates the cross-talk between GDF9 and BMP signaling that is necessary during follicle development because both ligands use components of the same signaling pathway.
Pangas
Stephanie A
SA
Department of Pathology, Baylor College of Medicine, Houston, Texas 77030, USA.
Jorgez
Carolina J
CJ
Matzuk
Martin M
MM
D000818:Animals; D015152:Blotting, Northern; D055430:Bone Morphogenetic Protein 15; D002460:Cell Line; D016207:Cytokines; D015232:Dinoprostone / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005260:Female; D005786:Gene Expression Regulation; D006107:Granulosa Cells / Q000378:metabolism; D055429:Growth Differentiation Factor 9; D017403:In Situ Hybridization; D036341:Intercellular Signaling Peptides and Proteins / Q000378:metabolism*; D008024:Ligands; D051379:Mice; D008954:Models, Biological; D020411:Oligonucleotide Array Sequence Analysis; D010053:Ovary / Q000378:metabolism; D010060:Ovulation; D012313:RNA / Q000378:metabolism; D012333:RNA, Messenger / Q000378:metabolism; D011994:Recombinant Proteins / Q000737:chemistry; D020133:Reverse Transcriptase Polymerase Chain Reaction; D015398:Signal Transduction; D013997:Time Factors; D016212:Transforming Growth Factor beta / Q000378:metabolism; D015854:Up-Regulation
D055430:Bone Morphogenetic Protein 15; D016207:Cytokines; D015232:Dinoprostone; D055429:Growth Differentiation Factor 9; D036341:Intercellular Signaling Peptides and Proteins; D008024:Ligands; D012313:RNA; D012333:RNA, Messenger; D011994:Recombinant Proteins; D016212:Transforming Growth Factor beta; C525902:Bmp15 protein, mouse; C113178:Grem1 protein, mouse; C525898:Gdf9 protein, mouse