ITT-5 Mechanisms of Spermatogenesis in Man

Summary

The purpose of this investigational drug study is to determine how much male hormone, testosterone, is needed to maintain sperm production in the testis.

Timeline

Start

2019-06

Primary completion

2021-12

Completion

2026-12

Publications

• Background Contraceptive efficacy of testosterone-induced azoospermia in normal men. World Health Organization Task Force on methods for the regulation of male fertility. Lancet. 1990 Oct 20;336(8721):955-9.
• Background Wu FC, Farley TM, Peregoudov A, Waites GM. Effects of testosterone enanthate in normal men: experience from a multicenter contraceptive efficacy study. World Health Organization Task Force on Methods for the Regulation of Male Fertility. Fertil Steril. 1996 Mar;65(3):626-36.
• Background Anawalt BD, Bebb RA, Bremner WJ, Matsumoto AM. A lower dosage levonorgestrel and testosterone combination effectively suppresses spermatogenesis and circulating gonadotropin levels with fewer metabolic effects than higher dosage combinations. J Androl. 1999 May-Jun;20(3):407-14.
• Background Zirkin BR, Santulli R, Awoniyi CA, Ewing LL. Maintenance of advanced spermatogenic cells in the adult rat testis: quantitative relationship to testosterone concentration within the testis. Endocrinology. 1989 Jun;124(6):3043-9. doi: 10.1210/endo-124-6-3043.
• Background Roth MY, Lin K, Amory JK, Matsumoto AM, Anawalt BD, Snyder CN, Kalhorn TF, Bremner WJ, Page ST. Serum LH correlates highly with intratesticular steroid levels in normal men. J Androl. 2010 Mar-Apr;31(2):138-45. doi: 10.2164/jandrol.109.008391. Epub 2009 Sep 24.
• Background Roth MY, Page ST, Lin K, Anawalt BD, Matsumoto AM, Snyder CN, Marck BT, Bremner WJ, Amory JK. Dose-dependent increase in intratesticular testosterone by very low-dose human chorionic gonadotropin in normal men with experimental gonadotropin deficiency. J Clin Endocrinol Metab. 2010 Aug;95(8):3806-13. doi: 10.1210/jc.2010-0360. Epub 2010 May 19.
• Background Trachtenberg J, Zadra J. Steroid synthesis inhibition by ketoconazole: sites of action. Clin Invest Med. 1988 Feb;11(1):1-5.
• Background Nashan D, Knuth UA, Weidinger G, Nieschlag E. The antimycotic drug terbinafine in contrast to ketoconazole lacks acute effects on the pituitary-testicular function of healthy men: a placebo-controlled double-blind trial. Acta Endocrinol (Copenh). 1989 May;120(5):677-81. doi: 10.1530/acta.0.1200677.
• Background Pont A, Graybill JR, Craven PC, Galgiani JN, Dismukes WE, Reitz RE, Stevens DA. High-dose ketoconazole therapy and adrenal and testicular function in humans. Arch Intern Med. 1984 Nov;144(11):2150-3.
• Background Van Tyle JH. Ketoconazole. Mechanism of action, spectrum of activity, pharmacokinetics, drug interactions, adverse reactions and therapeutic use. Pharmacotherapy. 1984 Nov-Dec;4(6):343-73. doi: 10.1002/j.1875-9114.1984.tb03398.x.
• Background Roth MY, Nya-Ngatchou JJ, Lin K, Page ST, Anawalt BD, Matsumoto AM, Marck BT, Bremner WJ, Amory JK. Androgen synthesis in the gonadotropin-suppressed human testes can be markedly suppressed by ketoconazole. J Clin Endocrinol Metab. 2013 Mar;98(3):1198-206. doi: 10.1210/jc.2012-3527. Epub 2013 Jan 24.
• Background Coviello AD, Matsumoto AM, Bremner WJ, Herbst KL, Amory JK, Anawalt BD, Sutton PR, Wright WW, Brown TR, Yan X, Zirkin BR, Jarow JP. Low-dose human chorionic gonadotropin maintains intratesticular testosterone in normal men with testosterone-induced gonadotropin suppression. J Clin Endocrinol Metab. 2005 May;90(5):2595-602. doi: 10.1210/jc.2004-0802. Epub 2005 Feb 15.

Drugs

Indications