title: Time dependence for the protective effect of androgen from procarbazine-induced damage to rat spermatogenesis.
abstract: The protective effects of androgen pretreatment on the procarbazine-induced killing of spermatogonial stem cells in Wistar rats have been investigated. Using testosterone-filled Silastic implants (200 mm2) the degree of protection from four weekly doses of procarbazine (100 mg/kg) was found to be dependent upon the androgen pretreatment time interval as assessed by quantitative histology. No protective effect was seen until rats had received 4 wk of pretreatment with androgen, whereafter protection increased to a maximum (about 20 to 30% of tubule cross-sections exhibiting recovery) after 8 to 12 wk of pretreatment. In contrast, the same level of maximal protection could be obtained by 6 wk of pretreatment using testosterone enanthate, suggesting that differences in protection may be achieved using different modes of androgen administration.
mesh_terms: D000728:Androgens / Q000494:pharmacology*; D000818:Animals; D002784:Cholesterol / Q000494:pharmacology; D005640:Follicle Stimulating Hormone / Q000097:blood; D007986:Luteinizing Hormone / Q000097:blood; D008297:Male; D011344:Procarbazine / Q000633:toxicity*; D051381:Rats; D011919:Rats, Inbred Strains; D013091:Spermatogenesis / Q000187:drug effects*; D013093:Spermatogonia / Q000187:drug effects; D013737:Testis / Q000187:drug effects; D013739:Testosterone / Q000494:pharmacology; D013997:Time Factors
chemical_list: D000728:Androgens; D011344:Procarbazine; D013739:Testosterone; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D002784:Cholesterol