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Alpha lipoic acid (ALA) effects on developmental competence of equine preantral follicles in short-term culture.
Theriogenology 2018 January 2
The effect of different concentrations of alpha lipoic acid (ALA) on the development and morphology of preantral follicles, as well as the proliferative activity of granulosa cells, was assessed after short-term culture. Ovaries (n = 5) of five seasonal anestrous mares were harvested in a local abattoir. At the laboratory, nine ovarian fragments (5 × 5 × 1 mm) from each animal were used. One fragment was immediately fixed in Bouin and subjected to histological and immunohistochemistry (proliferating cell nuclear antigen, PCNA) analyses (noncultured group; D0 = day 0). The other eight fragments were cultured in situ for two (D2) or six (D6) days in MEM+ or MEM+ plus ALA (50, 100, or 250 μM). After culture, fragments were subjected to histology and PCNA analyses. After two days of culture, ALA 50 and ALA 100 had the greatest (P < 0.05) percentage of normal primordial follicles (97.2 and 95.1%, respectively), when compared to other groups, and did not differ (P > 0.05) from the fresh noncultured control group. Furthermore, the total percentage of normal follicles was greater (P < 0.05) in the ALA 50 and ALA 100 than in the MEM-D2 group. After six days of culture, the highest (P < 0.05) proliferative activity of granulosa cells in developing follicles was observed for the groups MEM+ (92.9%), ALA 50 (100%), and ALA 100 (96.4%). In conclusion, the results of this study demonstrated that (1) ALA 50 and ALA 100 preserved the morphological integrity of equine primordial follicles for up two days of culture, and (2) granulosa cells of developing follicles enclosed in ovarian tissue and cultured for up to six days in MEM+ with or without ALA were highly stained by PCNA.
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