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Biology of Reproduction, Vol 50, 1190-1202, Copyright © 1994 by Society for the Study of Reproduction
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H Vanderstichele, B Delaey, J de Winter, F de Jong, L Rombauts, G Verhoeven, C Dello, A van de Voorde and T Briers
Innogenetics N.V., Ghent, Belgium.
The expression and function of gonadotropin receptors, and the secretion of steroids, transferrin, and cytokines were investigated in three immortalized (single transfection with v-myc) mouse granulosa cell lines (GRM01, GRM01L, and GRM02). A dose-dependent increase in progesterone production was obtained in GRM01 and GRM02 cells after addition of LH, FSH, modulators of the adenylate cyclase enzyme system, and cAMP analogues. The LH-induced release of progesterone was already detectable in GRM02 cells after 8 h and was related to incubation time and cell number. Both epidermal growth factor (EGF) and transforming growth factor alpha (TGF alpha) induced the secretion of progesterone in GRM02 cells, while no effect was obtained with TGF beta. LH receptor concentration was highest in the GRM02 cell line. FSH receptor mRNA was visualized in GRM01 and GRM02 cells. Aromatase activity in GRM02 cells was induced by androgens and inhibited by aromatase inhibitors. Whereas all cell lines were able to secrete transferrin, only in GRM01 cells was transferrin secretion increased significantly by LH. FSH did not affect transferrin secretion in the three cell lines, in contrast to forskolin or 8-bromo-cAMP. The immortalized mouse granulosa cell lines were able to express and release several growth factors. The expression and secretion of activin, inhibin, TGF beta, EGF, TGF alpha, insulin- like growth factor II, fibroblast growth factor (acidic and basic), platelet-derived growth factor, and interleukin-6 suggest an autocrine or paracrine role for these factors in follicular differentiation and function. In conclusion, these cells, derived from mural granulosa cells and immortalized in a preovulatory state, can be used to study granulosa cell physiology or to study the role of granulosa cells and their derivatives in the process of follicular maturation, fertilization, and early embryonic development.
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