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- W2053407818 abstract "Manipulation of one ovary in prepubertal gilts treated with pregnant mare serum gonadotropin (PMSG) and human chorionic gonadotropin (hCG) results in cysts on the manipulated ovary and corpora lutea (CL) on the non-manipulated (control) ovary. Because tissue-type plasminogen activator (tPA) might play a role in follicular rupture and because relaxin might increase tPA production, concentrations of tPA and relaxin in manipulated and control follicles were measured at different stages of development. Prepubertal gilts were treated with 1000 IU PMSG followed by 750 IU hCG at 72 hr later. Follicles on one ovary in each gilt were manipulated at laparotomy 48 hr after PMSG administration. Gilts were ovariectomized at 72, 90, 108, 114, 144, and 216 hr after PMSG. Concentrations of tPA and relaxin were determined for follicular fluid from follicles dissected free of ovarian stroma and snap frozen in liquid nitrogen and media from follicles cultured for 48 hr. Relaxin did not differ between treatment groups (manipulated and control) at any time (P > 0.05); whereas, tPA was greater in control follicles at 114 hr after PMSG than in manipulated follicles (P < 0.01). The effect of pyrilamine, a histamine-1 receptor antagonist, on tPA concentrations was determined in manipulated and control follicles collected at 3, 12, 24, 42, and 66 hr after manipulation. Concentrations of tPA were similar in control and manipulated follicles for gilts treated with pyrilamine, but again control follicles had greater (P < 0.05) tPA concentrations at 114 hr after PMSG. Thus, tPA seems to be involved in ovulation, and blockage of ovulation and subsequent cyst formation results from inadequate tPA activity in manipulated follicles." @default.
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- W2053407818 date "1998-05-01" @default.
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- W2053407818 title "Concentrations of Tissue-Type Plasminogen Activator and Relaxin in Normal and Induced-Cystic Follicles of Gilts" @default.
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- W2053407818 doi "https://doi.org/10.1016/s0739-7240(98)00004-6" @default.
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