Immunoneutralization of gonadotropin-releasing hormone and subsequent treatment with testosterone Silastic implants in rats: an approach toward developing a male contraceptive.

Abstract:

STUDY OBJECTIVE:To determine the extent to which increasing doses of exogenous testosterone (T) administered via Silastic implants can restore spermatogenesis and fertility to rats made azoospermic by active immunization against gonadotropin-releasing hormone (GnRH). DESIGN:Male rats were made azoospermic by active immunization against GnRH. Increasing doses of exogenously administered T (via Silastic implants) were administered for 8 weeks, and testicular sperm concentration and ability to impregnate female rats were evaluated. SETTING:Reproductive Endocrinology Laboratory, Department of Obstetrics and Gynecology, University of Colorado Health Sciences Center, Denver, Colorado. ANIMALS:Sexually mature male Sprague Dawley rats (SASCO, Omaha, NE). RESULTS:Suppression of gonadotropins and azoospermia was achieved by actively immunizing rats against GnRH. Testosterone was capable of restoring quantitatively complete spermatogenesis and fertility in GnRH-immunized azoospermic rats. This relationship was dose-dependent, as evidenced by the partial restoration of spermatogenesis and fertility observed in animals replaced with smaller T Silastic implants. CONCLUSION:Gonadotropin-releasing hormone immunization and T-filled Silastic implants may provide a model to study isolated gonadotropin deficiency and for the development of a reversible male contraceptive.

journal_name

Fertil Steril

journal_title

Fertility and sterility

authors

Awoniyi CA,Kim WK,Hurst BS,Schlaff WD

doi

10.1016/s0015-0282(16)55192-9

keywords:

subject

Has Abstract

pub_date

1992-08-01 00:00:00

pages

403-8

issue

2

eissn

0015-0282

issn

1556-5653

pii

S0015-0282(16)55192-9

journal_volume

58

pub_type

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