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a Department of Animal Science, Cornell University, Ithaca, New York 14853
The Fas antigen is a cell surface receptor that triggers apoptosis when bound to Fas ligand (FasL). Studies were undertaken to determine whether the cow provides a suitable model to study the role of the Fas pathway in inducing apoptosis of ovarian cells during follicular atresia. Expression of Fas antigen mRNA and responsiveness to FasL-induced killing in vitro were measured. Effects of the cytokines tumor necrosis factor (TNF)-
and interferon-
(IFN) were studied because of previous demonstrations of their role in Fas-mediated apoptosis in other cell types. Fas antigen mRNA was detectable in cultured granulosa and theca cells, and expression was increased by treatment with IFN but not TNF. Granulosa and theca cells were resistant to FasL-induced killing unless pretreated with IFN. TNF had no effect on FasL-induced killing. Granulosa and theca cell cultures in which killing occurred in response to FasL stained positively for annexin V, an early marker for cells undergoing apoptosis. These results provide a basis for further studies using the bovine ovary to examine the role of the Fas antigen in follicular atresia.
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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