TY - JOUR
T1 - Follicle-stimulating hormone blocks estrogen-positive feedback during the early follicular phase in monkeys
AU - Schenken, R. S.
AU - Hodgen, G. D.
N1 - Funding Information:
Received August 29, 1985; revised and accepted January 22, 1986. *Presented in part at the Thirty-Second Annual Meeting of the Society for Gynecologic Investigation, 1985. Supported in part by NIH Center grant P30-10202 (Bioassay and Radioimmunoassay Cores) and Ford Foundation grant 810-0293. tDepartment of Obstetrics and Gynecology, Division of Human Reproduction, The University of Texas Health Science Center at San Antonio. *Reprint requests: Robert S. Schenken, M.D., Department of Obstetrics and Gynecology, Division of Human Reproduction, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, San Antonio, Texas 78284. §The Jones Institute for Reproductive Medicine, Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Norfolk, Virginia.
PY - 1986
Y1 - 1986
N2 - Normally cycling rhesus monkeys were treated with 12.5 IU of follicle-stimulating hormone (FSH; n = 9) or saline (n = 9) on cycle days 1 to 4, 1 to 6, or 1 to 8 and 50 μg/kg estradiol benzoate (E2B, intramuscularly) on day 1, 3, or 5, respectively. Blood was collected daily, then every 8 hours for 96 hours after E2B treatment. Serum was assayed for FSH and luteinizing hormone (LH) by radioimmunoassay. Laparoscopy and serum E2 levels were used to assess ovarian follicular development. Eight of nine FSH-treated monkeys failed to demonstrate typical LH surges in response to E2B. One monkey treated with E2B on day 1 had an attenuated LH surge. All nine control monkeys demonstrated typical threefold LH increases within 72 hours after E2B treatment. Supraphysiologic ovarian stimulation was not visibly evident until 5 days after initiation of FSH treatment. These results suggest that the FSH-induced blockade of estrogen-positive feedbac for the LH surge antecedes overt ovarian hyperstimulation.
AB - Normally cycling rhesus monkeys were treated with 12.5 IU of follicle-stimulating hormone (FSH; n = 9) or saline (n = 9) on cycle days 1 to 4, 1 to 6, or 1 to 8 and 50 μg/kg estradiol benzoate (E2B, intramuscularly) on day 1, 3, or 5, respectively. Blood was collected daily, then every 8 hours for 96 hours after E2B treatment. Serum was assayed for FSH and luteinizing hormone (LH) by radioimmunoassay. Laparoscopy and serum E2 levels were used to assess ovarian follicular development. Eight of nine FSH-treated monkeys failed to demonstrate typical LH surges in response to E2B. One monkey treated with E2B on day 1 had an attenuated LH surge. All nine control monkeys demonstrated typical threefold LH increases within 72 hours after E2B treatment. Supraphysiologic ovarian stimulation was not visibly evident until 5 days after initiation of FSH treatment. These results suggest that the FSH-induced blockade of estrogen-positive feedbac for the LH surge antecedes overt ovarian hyperstimulation.
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U2 - 10.1016/s0015-0282(16)49287-3
DO - 10.1016/s0015-0282(16)49287-3
M3 - Article
C2 - 3082684
AN - SCOPUS:0022574193
VL - 45
SP - 556
EP - 560
JO - Fertility and Sterility
JF - Fertility and Sterility
SN - 0015-0282
IS - 4
ER -