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a Department of Animal Science, Cornell University, Ithaca, New York 14853
Fas antigen is a receptor that triggers apoptosis when bound by Fas ligand (FasL). A role for Fas antigen in follicular atresia was studied in follicles obtained during the first wave of follicular development during the bovine estrous cycle (estrus is Day 0). Granulosa and theca cells were isolated from healthy dominant follicles and the two largest atretic subordinate follicles on Day 5, atretic dominant follicles on Days 10–12, and preovulatory follicles on Day 1. Fas antigen mRNA levels were highest in granulosa cells from subordinate as compared to other follicles, and lowest in theca cells from healthy Day 5 dominant as compared to other follicles. FasL alone had no effect on viability of granulosa or theca cells but became cytotoxic in the presence of interferon-
(IFN). IFN has been shown to induce responsiveness to Fas antigen-mediated apoptosis in other cell types. In the presence of IFN, killing of granulosa cells by FasL was greater in subordinate compared to healthy dominant follicles on Day 5, did not differ between healthy and atretic dominant follicles, and was similar in theca among all follicles. Granulosa cells from preovulatory follicles, which had been exposed to the LH surge in vivo, were completely resistant to FasL-induced killing. In summary, Fas antigen expression, and responsiveness to Fas antigen-mediated apoptosis, vary during follicular development.
1 This work was supported by grants from the USDA (98–35203–6220) and NIH (HD 32535).
2 Correspondence: Susan M. Quirk, 258 Morrison Hall, Cornell University, Ithaca, NY 14853. FAX: 607 255 9829; smq1{at}cornell.edu
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