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Sponsors and Collaborators: |
University of Washington National Institute on Aging (NIA) ASCEND Therapeutics |
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Information provided by: | University of Washington |
ClinicalTrials.gov Identifier: | NCT00490022 |
The purpose of this research study is to understand the effects of a male hormone normally made in the body called Dihydrotestosterone (DHT) on the prostate gland that is located under the bladder. The knowledge gained from this study may be used to help in the future to develop a safe male hormonal contraceptive to prevent pregnancy, in the safe treatment of low male hormone levels in men, and in the treatment and prevention of diseases of the prostate.
The investigators will be giving DHT in a gel form, to be applied to the skin, or a placebo gel (with no active drug in it). The investigators want to see the effects of DHT on levels of hormones in the blood and in the prostate gland itself. In addition, the investigators will be studying the effects of DHT on the cells and genes expressed within the prostate.
The effect of DHT on the prostate is not known. Some studies suggest blocking production of DHT in the prostate helps growth of the gland with aging (a condition known as benign prostatic hyperplasia, or BPH for short) and may prevent prostate cancer. On the other hand, DHT administration may shrink the prostate, suggesting it may be beneficial for some men. Therefore, further studies looking at the effect of DHT on the prostate are needed.
Condition | Intervention | Phase |
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Healthy |
Drug: Dihydrotestosterone (DHT) gel (0.7%) Drug: Placebo gel |
Phase I Phase II |
Study Type: | Interventional |
Study Design: | Treatment, Randomized, Double Blind (Subject, Investigator), Placebo Control, Parallel Assignment, Pharmacokinetics/Dynamics Study |
Official Title: | The Effect of Dihydrotestosterone (DHT) on Prostate Tissue Androgen Concentrations and Inflammation in Normal Men |
Estimated Enrollment: | 40 |
Study Start Date: | June 2007 |
Estimated Study Completion Date: | January 2009 |
Estimated Primary Completion Date: | December 2008 (Final data collection date for primary outcome measure) |
Arms | Assigned Interventions |
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1: Active Comparator
DHT gel (70 mg/day) for one month
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Drug: Dihydrotestosterone (DHT) gel (0.7%)
DHT gel, 70 mg/day for one month
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2: Placebo Comparator
Placebo gel for one month
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Drug: Placebo gel
Placebo gel for one month
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In this study, we will examine the in vivo effects of DHT supplementation on the prostate and serum inflammatory markers at the molecular level. We hypothesize that increases in serum DHT will not increase intraprostatic DHT or prostate epithelial proliferation, and will be associated with decreases in markers of systemic inflammation. Normal, healthy, male study volunteers will be treated with either placebo gel (Group 1) or DHT gel (Group 2) for one month. Serum hormonal and inflammatory measurements will be assessed before, during, and after treatment, and the relationship between hormones and inflammatory markers associated with cardiovascular risk will be determined. Prostate biopsies will be taken after one month of treatment. Prostate tissue will be analyzed for changes in intraprostatic hormone levels as well as gene expression following treatment.
SPECIFIC AIMS:
We will test the hypothesis in normal men (rather than hypogonadal men) as a "proof of principle" investigation. A normal hypothalamic-pituitary-testicular axis and regulation, circulating T and DHT levels and intraprostatic androgen concentrations in healthy, normal men will permit optimal testing of the hypothesis. Exogenous DHT administration in normal men is expected to suppress endogenous gonadotropin and testosterone secretion, compared to more variable effects in hypogonadal men that depend on the degree of hypogonadism in these men and whether they have primary (testicular) or secondary (hypothalamic-pituitary) hypogonadism. Furthermore, intraprostatic T and DHT concentrations and 5 alpha-reductase activity (that is androgen-dependent) is expected to be more variable in hypogonadal men, depending on the degree of androgen deficiency and circulating T and DHT levels. If results in normal men support the hypothesis, subsequent studies could be performed in hypogonadal men. Because of the larger variability in circulating and probably intraprostatic androgen concentrations in hypogonadal men, these studies will require much larger numbers of subjects.
Ages Eligible for Study: | 35 Years to 55 Years |
Genders Eligible for Study: | Male |
Accepts Healthy Volunteers: | Yes |
Inclusion Criteria:
Exclusion Criteria:
Contact: Kymberley Anable | 206-616-0482 | kymmkatt@u.washington.edu |
Contact: Kathy Winter | 206-616-0484 | klwinter@u.washington.edu |
United States, Washington | |
University of Washington | Recruiting |
Seattle, Washington, United States, 98195 | |
Contact: Kymberley Anable 206-616-0482 kymmkatt@u.washington.edu | |
Contact: Kathy Winter 206-616-0484 klwinter@u.washington.edu | |
Sub-Investigator: John K Amory, MD, MPH | |
Sub-Investigator: Peter Nelson, MD | |
Sub-Investigator: Daniel Lin, MD | |
Sub-Investigator: Lawrence True, MD | |
Sub-Investigator: Elahe M Mostaghel, MD, PhD | |
Sub-Investigator: Bradley D Anawalt, MD | |
Sub-Investigator: William J Bremner, MD, PhD | |
Sub-Investigator: David Hess, PhD | |
Sub-Investigator: Christin Synder, MD | |
Sub-Investigator: Mara Y Roth, MD | |
Sub-Investigator: Alvin M Matsumoto, MD |
Principal Investigator: | Stephanie T Page, MD, PhD | University of Washington |
Responsible Party: | University of Washington ( Stephanie T Page, MD, PhD ) |
Study ID Numbers: | 07-5807-A, AGO27238-01 A1 |
Study First Received: | June 20, 2007 |
Last Updated: | October 24, 2008 |
ClinicalTrials.gov Identifier: | NCT00490022 |
Health Authority: | United States: Food and Drug Administration |
Dihydrotestosterone Androgen Prostate |
Dihydrotestosterone Healthy Inflammation |
Physiological Effects of Drugs Hormones, Hormone Substitutes, and Hormone Antagonists Hormones Pharmacologic Actions Androgens |