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- W2096862983 abstract "It has been proposed that the ovarian medulla exerts an intra-ovarian inhibitory effect on primordial follicle activation in cattle. We tested this hypothesis using cortical ovarian explants and determined whether growth factors could alter follicle activation or primary follicle health. Ovaries were obtained from bovine fetuses, and cortical slices were cultured on Millicell culture inserts for up to 8 days. Within 2 d of culture, the proportion of primordial follicles decreased from 70.1±3.5 to 6.4±3.4% (P<0.05), and the proportion of primary follicles increased from 23.8±3.3 to 79.7+5.5% (P<0.05). The proportion of secondary follicles was relatively stable (6 to 13%). Morphological examination indicated that 91.9±3.7, 76.7±8.8, and 71.8±10.4% of primordial, primary, and secondary follicles, respectively, were considered to be healthy in slices of fresh tissue; these proportions were not altered by up to 8 d of culture (P>0.05). The proportion of all classes of follicles and their morphological health were not affected by the addition of medullary slices to the culture well, nor by the culture of cortico-medullary slices (P>0.05). The addition of FSH, insulin-like growth factor-I, epidermal growth factor, basic fibroblast growth factor, or transforming growth factor-β did not alter primordial follicle activation or the morphological health of primary or secondary follicles. The addition of transforming growth factor-α (TGFα) decreased the proportion of primary follicles that were healthy from 67.6±5.1 to 36.8±4.7% (P<0.05). In conclusion, these data do not support the existence of a medullary inhibitor of primary follicle activation but suggest a role for TGFα in the regulation of primary follicle development." @default.
- W2096862983 created "2016-06-24" @default.
- W2096862983 creator A5009348849 @default.
- W2096862983 creator A5030549611 @default.
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- W2096862983 date "2000-09-01" @default.
- W2096862983 modified "2023-10-14" @default.
- W2096862983 title "Effect of growth factors and CO-culture with ovarian medulla on the activation of primordial follicles in explants of bovine ovarian cortex" @default.
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- W2096862983 doi "https://doi.org/10.1016/s0093-691x(00)00374-5" @default.
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