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Apoptosis of rat granulosa cells after staurosporine and serum withdrawal is suppressed by adenovirus-directed overexpression of prohibitin.

Authors: Chowdhury, I  Xu, W  Stiles, JK  Zeleznik, A  Yao, X  Matthews, R  Thomas, K  Thompson, WE 
Citation: Chowdhury I, etal., Endocrinology. 2007 Jan;148(1):206-17. Epub 2006 Oct 12.
Pubmed: (View Article at PubMed) PMID:17038561
DOI: Full-text: DOI:10.1210/en.2006-0187

Prohibitin (Phb1) is a highly conserved mitochondrial protein that is associated with granulosa cell differentiation, atresia, and luteolysis. Although prohibitin has been implicated in the suppression of apoptosis in mammalian cells, its specific role in programmed cell death in granulosa cells is unknown. In the present study, we examined the role of prohibitin in mediating staurosporine (STS) and serum withdrawal induced apoptosis in undifferentiated rat granulosa cells. Treatment of granulosa cells isolated from immature rat ovaries with STS and/or serum withdrawal induced a rapid decrease in the transmembrane potential of mitochondria, resulting in increased prohibitin content and induced apoptosis in a time- and dose-dependent manner. Infection of granulosa cells with a Phb1 adenoviral construct resulted in overexpression of prohibitin that markedly attenuated the ability of STS and serum withdrawal to induce apoptosis via the intrinsic apoptotic pathway. To determine the site of action of Phb1, granulosa cells were transfected with a prohibitin-eGFP fusion construct, and the fusion protein expression patterns were analyzed by fluorescence microscopy and Western blot analysis of cell fractionated samples. These studies indicated that the prohibitin-eGFP fusion protein moved from the cytoplasm into the mitochondria. However, no prohibitin-eGFP fusion protein was observed in the nucleus in response to the STS-induced apoptotic stimulus. This result was corroborated by Western blot analysis with green fluorescent protein-specific antibody. Furthermore, the prohibitin-eGFP fusion protein also inhibited programmed cell death. These results provide evidence that prohibitin could serve an antiapoptotic role in undifferentiated granulosa cells.

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CRRD Object Information
CRRD ID: 1601308
Created: 2007-04-16
Species: All species
Last Modified: 2007-04-16
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.