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Steroid reduction during ovarian stimulation impairs oocyte fertilization, but not folliculogenesis, in rhesus monkeys.
Fertil Steril. 1994 Jun; 61(6):1147-55.FS

Abstract

OBJECTIVE

To test the hypothesis that steroids locally modulate and may be required for normal follicular function and gametogenesis in primates, the effects of steroid reduction during gonadotropin-stimulated folliculogenesis was studied in rhesus monkeys.

DESIGN

Animals received human FSH (hFSH; days 1 to 6) and hFSH+human LH (hLH; day 7) to promote multiple follicular growth, and then received hCG (day 8) for ovulatory maturation. Four animals received trilostane (3 beta-hydroxysteroid dehydrogenase inhibitor) on days 1 to 8 or no inhibitor (controls; n = 4). Follicles were aspirated 34 hours after hCG.

MAIN OUTCOME MEASURES

Follicular growth, serum E2, P, and pregnenolone, oocyte nuclear maturity, and IVF.

RESULTS

Trilostane markedly reduced E2 to levels as low as 7% of controls throughout the follicular phase. Pregnenolone was 66-fold greater during trilostane treatment relative to controls. In both groups, P was at baseline during follicular stimulation but was reduced for 72 hours after hCG in trilostane-treated animals. Despite E2 suppression, follicular growth and oocyte nuclear maturity were unaltered by trilostane. Trilostane hindered the fertilizability of metaphase II oocytes (15%) in three of four animals compared with controls (65%). Metaphase I oocytes that required > 8 hours to complete meiosis in vitro failed to fertilize in the same three of four receiving trilostane relative to controls (31%).

CONCLUSIONS

Follicular growth and oocyte meiosis did not require high or increasing E2 levels. Levels of follicular products other than E2 may be of value in determining the progress of ovarian stimulation protocols. However, the acquisition of oocyte competence for fertilization may require steroids.

Authors+Show Affiliations

Division of Reproductive Sciences, Oregon Regional Primate Research Center 97006.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, U.S. Gov't, P.H.S.

Language

eng

PubMed ID

8194632

Citation

Zelinski-Wooten, M B., et al. "Steroid Reduction During Ovarian Stimulation Impairs Oocyte Fertilization, but Not Folliculogenesis, in Rhesus Monkeys." Fertility and Sterility, vol. 61, no. 6, 1994, pp. 1147-55.
Zelinski-Wooten MB, Hess DL, Wolf DP, et al. Steroid reduction during ovarian stimulation impairs oocyte fertilization, but not folliculogenesis, in rhesus monkeys. Fertil Steril. 1994;61(6):1147-55.
Zelinski-Wooten, M. B., Hess, D. L., Wolf, D. P., & Stouffer, R. L. (1994). Steroid reduction during ovarian stimulation impairs oocyte fertilization, but not folliculogenesis, in rhesus monkeys. Fertility and Sterility, 61(6), 1147-55.
Zelinski-Wooten MB, et al. Steroid Reduction During Ovarian Stimulation Impairs Oocyte Fertilization, but Not Folliculogenesis, in Rhesus Monkeys. Fertil Steril. 1994;61(6):1147-55. PubMed PMID: 8194632.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Steroid reduction during ovarian stimulation impairs oocyte fertilization, but not folliculogenesis, in rhesus monkeys. AU - Zelinski-Wooten,M B, AU - Hess,D L, AU - Wolf,D P, AU - Stouffer,R L, PY - 1994/6/1/pubmed PY - 1994/6/1/medline PY - 1994/6/1/entrez SP - 1147 EP - 55 JF - Fertility and sterility JO - Fertil Steril VL - 61 IS - 6 N2 - OBJECTIVE: To test the hypothesis that steroids locally modulate and may be required for normal follicular function and gametogenesis in primates, the effects of steroid reduction during gonadotropin-stimulated folliculogenesis was studied in rhesus monkeys. DESIGN: Animals received human FSH (hFSH; days 1 to 6) and hFSH+human LH (hLH; day 7) to promote multiple follicular growth, and then received hCG (day 8) for ovulatory maturation. Four animals received trilostane (3 beta-hydroxysteroid dehydrogenase inhibitor) on days 1 to 8 or no inhibitor (controls; n = 4). Follicles were aspirated 34 hours after hCG. MAIN OUTCOME MEASURES: Follicular growth, serum E2, P, and pregnenolone, oocyte nuclear maturity, and IVF. RESULTS: Trilostane markedly reduced E2 to levels as low as 7% of controls throughout the follicular phase. Pregnenolone was 66-fold greater during trilostane treatment relative to controls. In both groups, P was at baseline during follicular stimulation but was reduced for 72 hours after hCG in trilostane-treated animals. Despite E2 suppression, follicular growth and oocyte nuclear maturity were unaltered by trilostane. Trilostane hindered the fertilizability of metaphase II oocytes (15%) in three of four animals compared with controls (65%). Metaphase I oocytes that required > 8 hours to complete meiosis in vitro failed to fertilize in the same three of four receiving trilostane relative to controls (31%). CONCLUSIONS: Follicular growth and oocyte meiosis did not require high or increasing E2 levels. Levels of follicular products other than E2 may be of value in determining the progress of ovarian stimulation protocols. However, the acquisition of oocyte competence for fertilization may require steroids. SN - 0015-0282 UR - https://www.unboundmedicine.com/medline/citation/8194632/Steroid_reduction_during_ovarian_stimulation_impairs_oocyte_fertilization_but_not_folliculogenesis_in_rhesus_monkeys_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0015-0282(16)56771-5 DB - PRIME DP - Unbound Medicine ER -