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Granulosa Cells Promote Differentiation of Cortical Stromal Cells into Theca Cells in the Bovine Ovary¹

Departments of Obstetrics and Gynecology³ and Biochemistry,⁴ University of Fukui, Fukui 910-1193, Japan CREST,⁵ JST (Japan Science and Technology Agency), Saitama 322-0012, Japan Departments of Obstetrics & Gynecology⁶ and Cellular & Molecular Medicine,⁷ University of Ottawa, Ottawa Health Research Institute, Ottawa, Ontario, Canada K1Y 4E9

ABSTRACT

Formation of a theca cell (TC) layer is an important physiologic event that occurs during early follicular development. Nevertheless, little is known concerning the nature and regulation of the formation of the TC layer during follicular growth. Using an established coculture system in this study, we examined the hypothesis that stromal cells differentiate into TCs during early follicular development and that this process involves interaction with granulosa cells (GCs). Ovarian stromal cells from the bovine ovarian cortex (S_C) and medulla (S_M) were cultured with or without GCs from small antral follicles. The presence of GCs increased the number of lipid droplets and mitochondria, and it stimulated androstenedione production in S_C and S_M. However, luteinizing hormone/choriogonadotropin receptor (LHCGR) mRNA abundance and hCG-induced cAMP and androstenedione production were increased in S_C but not in S_M by the presence of GCs. The present results indicate that GCs are involved in the functional differentiation and the acquisition of LH responsiveness in stromal cells of the ovarian cortex. We suggest that GC-S_C interaction is important in the formation of the TC layer during early follicular development, although the nature of this interaction remains to be determined.

androgen, follicle, granulosa cells, LH receptor, ovary, theca cells

² Correspondence: FAX: 81 776 61 8117; kotsujif{at}fmsrsa.fukui-med.ac.jp

¹ Supported by the Ministry of Education, Culture, Sports, Science, and Technology, Japan and the Canadian Institutes of Health Research.

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