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Cross-Talk between Fas/Fas ligand system and nitric oxide in the pathway subserving granulosa cell apoptosis: a possible regulatory mechanism for ovarian follicle atresia.

Authors: Chen, Q  Yano, T  Matsumi, H  Osuga, Y  Yano, N  Xu, J  Wada, O  Koga, K  Fujiwara, T  Kugu, K  Taketani, Y 
Citation: Chen Q, etal., Endocrinology 2005 Feb;146(2):808-15. Epub 2004 Nov 4.
Pubmed: (View Article at PubMed) PMID:15528299
DOI: Full-text: DOI:10.1210/en.2004-0579

Recent studies have shown the involvement of Fas/Fas ligand (FasL) system and nitric oxide (NO) in ovarian follicle atresia. Here we asked whether Fas/Fas ligand system interacts with NO using rat granulosa cell culture. Soluble recombinant Fas ligand (rFasL), at 100 ng/ml, significantly decreased cell viability, as measured by 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)- 2H-tetrazolium, inner salt (MTS) assay, in the presence of 200 U/ml interferon-gamma, whereas the concurrent addition of a caspase inhibitor, Z-VAD-FMK, at 20 microm, significantly inhibited rFasL-induced cytotoxicity. Hoechst 33342 staining and flow cytometric analysis confirmed the induction of apoptosis in granulosa cells by 100 ng/ml rFasL in the presence of interferon-gamma, which was blocked by the concomitant addition of an NO donor, S-nitroso-N-acetylpenicillamine. Western blot analysis demonstrated that rFasL significantly up-regulated caspase-3, -8, and -9 activities in granulosa cells, which were attenuated by concurrent treatment with S-nitroso-N-acetylpenicillamine. Real-time quantitative RT-PCR revealed a significant decrease in inducible NO synthase mRNA levels in rFasL-induced apoptotic granulosa cells. In conclusion, we demonstrated the involvement of Fas/FasL system in inducing apoptosis through activation of a caspase-mediated cascade in rat granulosa cells, which is coupled with a decrease in inducible NO synthase expression. We further showed that NO inhibited Fas/FasL system-induced apoptosis by suppressing activation of the caspases, pointing to a cross-talk between Fas/FasL system-induced apoptosis pathway and NO-mediated antiapoptotic pathway in ovarian follicle atresia.

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RGD Object Information
RGD ID: 1358614
Created: 2005-06-18
Species: All species
Last Modified: 2005-06-18
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.