{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,20]],"date-time":"2025-08-20T12:58:41Z","timestamp":1755694721660},"reference-count":38,"publisher":"The Endocrine Society","issue":"9","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2011,9,1]]},"abstract":"<jats:p>Why both testosterone (T) suppression and cryptorchidism reverse the block in spermatogonial differentiation in adult mice homozygous for the juvenile spermatogonial depletion (jsd) mutation has been a conundrum. To resolve this conundrum, we analyzed interrelations between T suppression, testicular temperature, and spermatogonial differentiation and used in vitro techniques to separate the effects of the two treatments on the spermatogonial differentiation block in jsd mice. Temporal analysis revealed that surgical cryptorchidism rapidly stimulated spermatogonial differentiation whereas androgen ablation treatment produced a delayed and gradual differentiation. The androgen suppression caused scrotal shrinkage, significantly increasing the intrascrotal temperature. When serum T or intratesticular T (ITT) levels were modulated separately in GnRH antagonist-treated mice by exogenous delivery of T or LH, respectively, the inhibition of spermatogonial differentiation correlated with the serum T and not with ITT levels. Thus, the block must be caused by peripheral androgen action. When testicular explants from jsd mice were cultured in vitro at 32.5 C, spermatogonial differentiation was not observed, but at 37 C significant differentiation was evident. In contrast, addition of T to the culture medium did not block the stimulation of spermatogonial differentiation at 37 C, and androgen ablation with aminoglutethimide and hydroxyflutamide did not stimulate differentiation at 32.5 C, suggesting that T had no direct effect on spermatogonial differentiation in jsd mice. These data show that elevation of temperature directly overcomes the spermatogonial differentiation block in adult jsd mice and that T suppression acts indirectly in vivo by causing scrotal regression and thereby elevating the testicular temperature.<\/jats:p>","DOI":"10.1210\/en.2011-0251","type":"journal-article","created":{"date-parts":[[2011,7,6]],"date-time":"2011-07-06T02:58:40Z","timestamp":1309921120000},"page":"3504-3514","source":"Crossref","is-referenced-by-count":10,"title":["Androgen Suppression-Induced Stimulation of Spermatogonial Differentiation in Juvenile Spermatogonial Depletion Mice Acts by Elevating the Testicular Temperature"],"prefix":"10.1210","volume":"152","author":[{"given":"Gunapala","family":"Shetty","sequence":"first","affiliation":[{"name":"Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Karen L.","family":"Porter","sequence":"first","affiliation":[{"name":"Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wei","family":"Zhou","sequence":"first","affiliation":[{"name":"Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shan H.","family":"Shao","sequence":"first","affiliation":[{"name":"Department of Experimental Radiation Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Connie C. 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