title: Testosterone suppresses spermatogenesis in juvenile spermatogonial depletion (jsd ) mice.
abstract: Male juvenile spermatogonial depletion (jsd/jsd) mice are sterile because of a failure of spermatogonial differentiation. We have previously reported the recovery of spermatogonial differentiation by suppressing the levels of gonadotropins and testosterone with Nal-Glu, a GnRH antagonist. To determine whether suppression of testosterone or the gonadotropins was responsible for spermatogenic recovery, we examined the effect of supplementation of LH or FSH along with Nal-Glu treatment. Systemic administration of flutamide, an androgen receptor antagonist, was also examined. LH supplementation elevated both serum and intratesticular testosterone levels and suppressed the recovery of spermatogonial differentiation in a dose-dependent manner. Supplementation with FSH did not affect either testosterone levels or spermatogonial differentiation. Furthermore, the mice treated with flutamide showed some recovery of spermatogonial differentiation. The overall findings revealed that testosterone action mediated by androgen receptors suppressed the spermatogonial differentiation in jsd/jsd mice and suggested that spermatogonial differentiation in the jsd mutant is highly sensitive to testosterone suppression.
authors.affiliation: Department of Urology, Osaka University Medical School, Suita, Osaka 565-0871, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Tohda
authors.forename: K
authors.initials: K
authors.lastname: Matsumiya
authors.forename: Y
authors.initials: Y
authors.lastname: Tadokoro
authors.forename: K
authors.initials: K
authors.lastname: Yomogida
authors.forename: Y
authors.initials: Y
authors.lastname: Miyagawa
authors.forename: K
authors.initials: K
authors.lastname: Dohmae
authors.forename: A
authors.initials: A
authors.lastname: Okuyama
authors.forename: Y
authors.initials: Y
authors.lastname: Nishimune
mesh_terms: D000726:Androgen Antagonists / Q000494:pharmacology; D059002:Androgen Receptor Antagonists; D000818:Animals; D002454:Cell Differentiation / Q000187:drug effects; D004151:Dipeptides / Q000494:pharmacology; D005485:Flutamide / Q000494:pharmacology; D005640:Follicle Stimulating Hormone / Q000494:pharmacology; D007987:Gonadotropin-Releasing Hormone / Q000037:antagonists & inhibitors; D007986:Luteinizing Hormone / Q000494:pharmacology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D011944:Receptors, Androgen / Q000502:physiology; D013091:Spermatogenesis / Q000187:drug effects*; D013093:Spermatogonia / Q000166:cytology*; D013739:Testosterone / Q000097:blood / Q000494:pharmacology*
chemical_list: C102118:2-naphthylalanyl-glutamic acid; D000726:Androgen Antagonists; D059002:Androgen Receptor Antagonists; D004151:Dipeptides; D011944:Receptors, Androgen; D007987:Gonadotropin-Releasing Hormone; D013739:Testosterone; D005485:Flutamide; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone