The cooperative effect of growth and differentiation factor-9 and bone morphogenetic protein (BMP)-15 on granulosa cell function is modulated primarily through BMP receptor II.
Growth and differentiation factor 9 (GDF9) and bone morphogenetic protein 15 (BMP15, GDF9B) are oocyte-derived proteins essential for the growth and function of ovarian follicles. Moreover, ovine (o) GDF9 and oBMP15 cooperate to increase both (3)H-thymidine incorporation and alpha-inhibin production and to inhibit progesterone production by rat or ovine granulosa cells. Although the receptors through which these proteins act individually have been determined, the receptor(s) involved in mediating the cooperative effects of GDF9 and BMP15 is (are) unknown. In this study, the effects of the extracellular domains of the types I and II TGFbeta receptors on (3)H-thymidine incorporation by rat granulosa cells stimulated by oGDF9 and oBMP15 were investigated. Stimulation of (3)H-thymidine incorporation was completely blocked by the BMP receptor II (BMPRII) extracellular domain but unaffected by any other type II or any type I receptor. These results suggest that the initial interaction of oGDF9 and oBMP15 is with BMPRII and that a type I receptor is either recruited or already associated with BMPRII to mediate the cooperative effects of these growth factors.
AgResearch, Invermay Agricultural Centre, Puddle Alley, Private Bag 50034, Mosgiel 9053, New Zealand.
Sara J
SJ
Edwards
Karen L
KL
Reader
Stan
S
Lun
Andrea
A
Western
Steve
S
Lawrence
Kenneth P
KP
McNatty
Jennifer L
JL
Juengel
D000818:Animals; D055430:Bone Morphogenetic Protein 15; D052005:Bone Morphogenetic Protein Receptors, Type I / Q000276:immunology / Q000378:metabolism; D052006:Bone Morphogenetic Protein Receptors, Type II / Q000276:immunology / Q000378:metabolism*; D049109:Cell Proliferation; D002478:Cells, Cultured; D005260:Female; D006107:Granulosa Cells / Q000378:metabolism* / Q000473:pathology; D055429:Growth Differentiation Factor 9; D006801:Humans; D007074:Immunoglobulin G / Q000276:immunology; D036341:Intercellular Signaling Peptides and Proteins / Q000378:metabolism*; D017434:Protein Structure, Tertiary / Q000502:physiology; D051381:Rats; D017207:Rats, Sprague-Dawley; D013936:Thymidine / Q000378:metabolism; D014316:Tritium / Q000378:metabolism
C525901:BMP15 protein, human; C525904:Bmp15 protein, rat; D055430:Bone Morphogenetic Protein 15; C525897:GDF9 protein, human; C525899:Gdf9 protein, rat; D055429:Growth Differentiation Factor 9; D007074:Immunoglobulin G; D036341:Intercellular Signaling Peptides and Proteins; D014316:Tritium; D052005:Bone Morphogenetic Protein Receptors, Type I; D052006:Bone Morphogenetic Protein Receptors, Type II; D013936:Thymidine