Paradoxical effects of D-Trp6-luteinizing hormone-releasing hormone on the hypothalamic-pituitary-gonadal axis in immature female rats.

Abstract:

:The effect of administration of a superactive and long-acting analog of luteinizing hormone-releasing hormone (LH-RH), D-Trp6-LH-RH, in doses of 0.05 or 1 microgram/day for 10 days on the hypothalamic-pituitary-gonadal axis was studied in immature female rats. Treatment with a 0.05-microgram dose of analog produced few changes as compared with the control group. Treatment with 1 microgram of D-Trp6-LH-RH did not affect the body weight or the pituitary weight, but increased ovarian weight and decreased uterine weight; elevated serum gonadotropin levels; and lowered the pituitary LH content. This depletion of pituitary LH content was associated with a low pituitary responsiveness to LH-RH. Serum estradiol levels were not modified, suggesting that decreased uterine weight reflects a direct and extrapituitary effect of this analog. The hypothalamic LH-RH content was higher, indicating a possible inhibition of the release of endogenous LH-RH. A delay in vaginal opening was also observed. This indicates that large doses of D-Trp6-LH-RH may interfere with the process of puberty in rats. These findings extend other reports about the paradoxical antifertility effects of large doses of stimulatory analogs of LH-RH.

journal_name

Fertil Steril

journal_title

Fertility and sterility

authors

Vilchez-Martinez JA,Pedroza E,Arimura A,Schally AV

doi

10.1016/s0015-0282(16)44061-6

subject

Has Abstract

pub_date

1979-06-01 00:00:00

pages

677-82

issue

6

eissn

0015-0282

issn

1556-5653

pii

S0015-0282(16)44061-6

journal_volume

31

pub_type

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