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HOP-3 Manipulation of the Intratesticular Hormonal Milieu With Exogenous Testosterone

Information source: University of Washington
ClinicalTrials.gov processed this data on August 23, 2015
Link to the current ClinicalTrials.gov record.

Condition(s) targeted: Healthy Males

Intervention: Acyline (Drug); placebo hCG (no active ingredient) (Other); hCG (human chorionic gonadotropin) (Drug); hCG (human chorionic gonadotropin) (Drug); hCG (human chorionic gonadotropin) (Drug); Testosterone gel (Drug)

Phase: Phase 1/Phase 2

Status: Completed

Sponsored by: University of Washington

Official(s) and/or principal investigator(s):
William Bremner, MD, PhD, Principal Investigator, Affiliation: University of Washington


The purpose of this investigational study is to determine how much male hormone, testosterone, is necessary to maintain sperm production in the testis. This knowledge will be used to help in the development of a safe male hormonal contraception.

Clinical Details

Official title: Manipulation of the Intratesticular Hormonal Milieu With Exogenous Testosterone (Short Title (HOP-3)

Study design: Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Open Label, Primary Purpose: Treatment

Primary outcome:

Serum Testosterone (T)

Serum Luteinizing Hormone (LH)

Serum Follicle Stimulating Hormone (FSH)

Intratesticular Testosterone (ITT-T)

Detailed description: Three study drugs will be used in this study: Testim (testosterone gel), Human Chorionic Gonadotropin (hCG) and acyline. Testosterone is a naturally occurring hormone in men. When given to normal men, testosterone gel will temporarily lower the amount of testosterone in the testes and lower sperm counts. hCG is a female hormone produced during pregnancy that is similar to and has the same actions as a male hormone, luteinizing hormone (LH). Like LH, hCG stimulates the testis to produce testosterone and sperm, and is used in the treatment of men who are deficient in LH. When hCG is given together with testosterone to normal men, the amount of testosterone in the testes will change, dependent on the amount of hCG received. Some participants will receive placebo hCG injections (no active medication). Acyline suppresses LH (luteinizing hormone) and FSH (follicle stimulating hormone), which are hormones made by the pituitary gland in the brain, thus blocking the signal from the brain that causes the testes to make testosterone. Therefore, acyline blocks testosterone production. Men may experience some side effects from the low levels of testosterone caused by acyline. Acyline is an experimental drug. Testosterone gel and hCG are approved for use in men with low testosterone levels. The U. S. Food and Drug Administration (FDA) allows testosterone gel, hCG and acyline to be given in combination for research to a small number of volunteers. Over 125 men have received acyline. Both Acyline and hCG will be given by injection. Acyline injections are formulated by subjects weight and may be given in multiple injections. Participation will last approximately 2 months. The study involves a minimum of 9 visits in Seattle, WA. Clinic visits at Screening, Day 1 and Day 10 will take about 1-1. 5 hours each. On Day 1 & 10 a fine needle aspiration of one testis will be performed. The Day 7, Day 17, and Day 40 visits will take approximately 30 minutes. The other visits will take about 15 minutes each time. Over the course of the study, which includes 5 separate blood draws, approximately 12 ounces (one and a half cups) of blood will be drawn. Some of the study drugs will be given by injection. One drug is a topical gel. This is NOT a trial of a male contraceptive, and the study medications will not prevent pregnancy. Subjects must use an acceptable form of birth control.


Minimum age: 18 Years. Maximum age: 50 Years. Gender(s): Male.


Inclusion Criteria:

- Males age 18-50

- Normal serum testosterone, LH and FSH

- PSA < 4. 0

- Agrees not to donate blood or participate in another research study during the study

- Informed consent

- In general good health based on normal screening evaluation (consisting of a medical

history, physical exam, normal sperm count, normal serum chemistry and hematology)

- Must be willing to use a reliable form of contraception during the study

Exclusion Criteria:

- Oligospermia (sperm count < 15 million/mL after 48 hours of abstinence) and/or

abnormal motility or morphology.

- Participation in a long-term male contraceptive study within the past three months

- History of testosterone or anabolic steroid abuse in the past

- Poor general health with significantly abnormal blood results

- History of or current testicular disease

- History of a bleeding disorder or need for anticoagulation

- History of sleep apnea and/or major psychiatric problems

- BMI > 32

- Subjects with a skin condition that might interfere or be exacerbated by testosterone

gel use

- Subject's with alcohol or drug use

Locations and Contacts

University of Washington, Seattle, Washington 98195, United States
Additional Information

Dedicated to basic and clinical research focused primarily on the male reproductive system

Related publications:

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.

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.

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.

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.

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. Epub 2005 Feb 15.

Coviello AD, Bremner WJ, Matsumoto AM, Herbst KL, Amory JK, Anawalt BD, Yan X, Brown TR, Wright WW, Zirkin BR, Jarow JP. Intratesticular testosterone concentrations comparable with serum levels are not sufficient to maintain normal sperm production in men receiving a hormonal contraceptive regimen. J Androl. 2004 Nov-Dec;25(6):931-8.

Awoniyi CA, Sprando RL, Santulli R, Chandrashekar V, Ewing LL, Zirkin BR. Restoration of spermatogenesis by exogenously administered testosterone in rats made azoospermic by hypophysectomy or withdrawal of luteinizing hormone alone. Endocrinology. 1990 Jul;127(1):177-84.

Chen H, Chandrashekar V, Zirkin BR. Can spermatogenesis be maintained quantitatively in intact adult rats with exogenously administered dihydrotestosterone? J Androl. 1994 Mar-Apr;15(2):132-8.

Meriggiola MC, Costantino A, Bremner WJ, Morselli-Labate AM. Higher testosterone dose impairs sperm suppression induced by a combined androgen-progestin regimen. J Androl. 2002 Sep-Oct;23(5):684-90.

Starting date: March 2009
Last updated: October 24, 2012

Page last updated: August 23, 2015

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