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Molecular Endocrinology 13 (6): 1018-1034
Copyright © 1999 by The Endocrine Society

Molecular Characterization of the Follicle Defects in the Growth Differentiation Factor 9-Deficient Ovary

Julia A. Elvin, Changning Yan, Pei Wang, Katsuhiko Nishimori and Martin M. Matzuk

Department of Pathology (J.A.E., C.Y., P.W., M.M.M.) Department of Molecular and Human Genetics (J.A.E., M.M.M.), and Department of Cell Biology (M.M.M.) Baylor College of Medicine Houston, Texas 77030
Department of Applied Biochemistry (K.N.) Tohoku University Sendai, Miyagi, Japan 981-8555

Growth differentiation factor-9 (GDF-9), a secreted member of the transforming growth factor-ß superfamily, is expressed at high levels in the mammalian oocyte beginning at the type 3a primary follicle stage. We have previously demonstrated that GDF-9-deficient female mice are infertile because of an early block in folliculogenesis at the type 3b primary follicle stage. To address the molecular defects that result from the absence of GDF-9, we have analyzed the expression of several important ovarian marker genes. The major findings of our studies are as follows: 1) There are no detectable signals around GDF-9-deficient follicles for several theca cell layer markers [i.e. 17{alpha}-hydroxylase, LH receptor (LHR), and c-kit, the receptor for kit ligand]. This demonstrates that in the absence of GDF-9, the follicles are incompetent to emit a signal that recruits theca cell precursors to surround the follicle; 2) The primary follicles of GDF-9-deficient mice demonstrate an up-regulation of kit ligand and inhibin-{alpha}. This suggests that these two important secreted growth factors, expressed in the granulosa cells, may be directly regulated in a paracrine fashion by GDF-9. Up-regulation of kit ligand, via signaling through c-kit on the oocyte, may be directly involved in the increased size of GDF-9-deficient oocytes and the eventual demise of the oocyte; 3) After loss of the oocyte, the cells of the GDF-9-deficient follicles remain in a steroidogenic cluster that histologically resembles small corpora lutea. However, at the molecular level, these cells are positive for both luteal markers (e.g. LHR and P-450 side chain cleavage) and nonluteal markers (e.g. inhibin {alpha} and P-450 aromatase). This demonstrates that initially the presence of the oocyte prevents the expression of luteinized markers, but that the absence of GDF-9 at an early timepoint alters the differentiation program of the granulosa cells; and 4) As demonstrated by staining with either proliferating cell nuclear antigen (PCNA) or Ki-67 and TUNEL (terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling) labeling, the granulosa cells of GDF-9-deficient type 3b primary follicles fail to proliferate but also fail to undergo cell death. This suggests that granulosa cells of type 3b follicles require GDF-9 for continued growth and also to become competent to undergo apoptosis, possibly through a differentiation event. Thus, these studies have enlightened us as to the paracrine roles of GDF-9 as well as the normal steps of granulosa cell and theca cell growth and differentiation within ovarian follicles.




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