[Prostaglandin and luteinized unruptured follicles: the follicles of gilts treated with the inhibitors of prostaglandin production (author's transl)].

The inhibitors of prostaglandin (PG) production (indomethacin, etc.) block ovulation. But little is known about how the inhibition of PG production effects cell function in the follicle. This study was done to clarify the morphological changes and steroidogenesis in the follicles treated with the inhibitor. Fifteen gilts treated with PMS and hCG were administered with indomethacin of 7.6 mg/kg (enough for a complete block) 24 hrs. after hCG. The morphological study of the follicles was done by serial section. The levels of estradiol-17 beta, testosterone, 17 alpha OH progesterone and progesterone were estimated by RIA in the follicular fluid, ovarian vein and peripheral blood. A histologic section of the treated follicles revealed the presence of entrapped oocytes surrounded by heavily luteinized granulosa-theca cells. No morphological changes were found in the luteal cells at any stage of the luteal phase except for retention of fluid in the central cavity of the corpus luteum. The life span of the corpus luteum (18 days) was not affected by indomethacin. No differences in steroid levels were detected in the peripheral and ovarian vein blood or in the follicular fluid at any time compared with the control. Inhibition of PG production results in the luteinized unruptured follicle without interference with steroidogenesis.