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- W2000302362 abstract "Tissue slices taken from the cortex of bovine ovaries were perifused with medium-199 supplemented with 1) no hormones, 2) insulin (200 IU/l), 3) estradiol-17beta (E2 100 ng/ml), 4) insulin plus E2 or 5) insulin, E2 plus human chorionic gonadotropin (hCG; 0.1 IU/ml). After 0, 3, 24 and 48 h of perifusion, cortical slices were either incubated with 3H-thymidine to determine the amount of 3H-thymidine incorporated into DNA, or prepared for histology. Prior to perifusion, cortical slices incorporated 3H-thymidine at a rate of 17.5 +/- 2.5 cpm/mg/h and contained 22.2 +/- 4.4 primary and 11.3 +/- 3.9 preantral follicles/slice. 3H-thymidine incorporation remained at 0 h levels, but by 48 h of perifusion the number of primary follicles per slice was reduced to 2.5 +/- 2.2, 2.5 +/- 2.5 and 3.3 +/- 1.2 for cortical slices exposed to either no hormones, insulin or E2, respectively (P < 0.05). Exposure to either insulin and E2 or insulin, E2 plus hCG resulted in an increase in 3H-thymidine incorporation with the number of primary follicles decreasing at 24 h (P < 0.05) then increasing at 48 h of perifusion (P < 0.05). The addition of hCG increased both 3H-thymidine incorporation and the number of primary follicles present after 48 h compared to treatment with insulin and E2 alone (P < 0.05). The interstitium was well maintained if insulin was present in the medium. These results indicate that 1) insulin is essential for the maintenance of the interstitial cells, 2) a synergistic interaction between insulin and E2 stimulates primordial follicles to grow into primary follicles and 3) hCG facilitates the growth-promoting actions of insulin and E2." @default.
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- W2000302362 date "1988-09-01" @default.
- W2000302362 modified "2023-10-16" @default.
- W2000302362 title "Factors controlling the growth of bovine primary and preantral follicles in perifusion culture" @default.
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- W2000302362 doi "https://doi.org/10.1016/0093-691x(88)90203-8" @default.
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