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Home > "E" Clinical Trials Conditions > Effects on the Brain of Lupron Induced Hypogonadotropic Hypogonadism with and without Testosterone Replacement  Effects on the Brain of Lupron Induced Hypogonadotropic Hypogonadism with and without Testosterone Replacement
Effects on the Brain of Lupron Induced Hypogonadotropic Hypogonadism with and without Testosterone Replacement
For Condition: Hypogonadism
Status: Completed
Sponsor(s): National Institute of Mental Health (NIMH) ,
Synopsis: There is evidence that suggests male sex hormones (androgens) play a significant role in brain (central nervous system) functioning. In studies conducted with animals, researchers have documented that male sex hormones (androgens) are associated with neurotransmitter (serotonin) function, sexual behavior, aggression, and other non-reproductive behavior. Similar findings have been seen in studies involving humans. Androgens are thought to be involved in some neurologic conditions. Tourette's syndrome which is seen more often in males than females has caused researchers to look more closely at the effects of androgens on the brain. This study is designed to examine the effects of testosterone on brain (CNS) activity by first stopping testosterone release and then replacing it. Researchers will evaluate mood, behavior, cognitive (mental) function, physiologic response to serotonergic agonists and regional cerebral blood flow (r-CBF). This study will attempt to answer the following questions; 1. Is a person's mental functioning a result of being male or female (gender) or a result of the hormonal condition 3. Does the decrease of blood flow (r-CBF) to specific areas of the brain (prefrontal cortex) in women whose ovaries are not releasing hormones (hypogonadal state) also occur in men 4. Will the mental rotation task better identify hormone (gonadal steroid) differences in r-CBF 5. Do hormones directly influence the responsiveness of the hypothalamic-pituitary-adrenal (HPA) axis 6. Does the hormonal state of a patient directly affect levels of chemicals and steroids in the cerebrospinal fluid (CSF).
Details: Several types of evidence suggest that androgens exert clinically significant effects on central nervous system (CNS) function. In animal studies, androgens modulate brain serotonin function, and regulate sexual behavior, aggression, and other non-reproductive behaviors. These actions reflect both organizational and activational effects of androgens. Several studies in humans also support the central modulatory capacity of androgens. Correlative studies have described relationships between plasma androgen levels and sexual interest/behavior and cognitive task performance. Androgens are believed to underlie gender related differences in the prevalence of certain neuropsychiatric disorders, resulting in trials of anti-androgens in at least one of these disorders (Tourette's syndrome). Finally, androgens are believed to possess psychotropic effects in humans, evidenced by purported antidepressant effects and reports of psychotic reactions following administration of androgens. In a recent study, we demonstrated that androgenic/anabolic steroids precipitated mood and behavioral state disturbances when administered in a double-blind, placebo-controlled fashion in normal volunteers. There are remarkably few studies that attempt to identify the CNS effects of androgens or the central systems that may mediate these effects. In this study we propose to examine directly the effects of testosterone on CNS activity by first suppressing and then, in a double-blind, placebo-controlled fashion, replacing physiological levels of testosterone. We will evaluate mood, behavior, cognitive function, physiologic response to serotonergic agonists and cerebral blood flow (separate protocols) during both pharmacologically controlled hormonal conditions: hypogonadism and hypogonadism with testosterone replacement. On the basis of prior findings from our group and from others, we will be asking the following questions: 1) Does cognitive function differ as a function of gender or of hormonal condition; 2) Is the decreased r-CBF that we observed in the prefrontal cortex during the hypogonadal state in women also demonstrable in men; 3) Do measures of hypothalamic-pituitary-adrenal axis responsivity differ as a function of gender or of hormonal condition; and 4) Do CSF neurochemistry and neurosteroid levels differ as a consequence of changing hormonal state. This protocol will not only provide much needed information about the behavioral and physiological effects of androgens but will serve as a companion study for NIMH protocol #92-M-172, "The Central Nervous System Effects of Pharmacologically Induced Hypogonadotropic Hypogonadism with and without Estrogen and Progressive Replacement."
Eligibility:
Study Type: Observational, Natural History
Minimum Age/Maximum Age: /
Genders: Male
Protocol Entry Criteria: Age 18-45. Males. No current mood symptoms. No past psychiatric history. Not taking ongoing medications. No medical illnesses.
Total Enrollment: 70
Location and Contact Information:
National Institute of Mental Health (NIMH)
Bethesda, Maryland, 20892
United States
Additional Information:
Study ID Numbers: 940037; 94-M-0037
Study Start Date: December 3, 1993
Record last reviewed: November 14, 2001
Additional information available at: clinicaltrials.gov
Clinicaltrials.gov Reference link: NCT00001412
Other Hypogonadism Studies:
1. Follicle Stimulating Hormone (FSH) to Improve Testicular Development in Men with Hypogonadism
2. Leuprolide in Determining the Cause of Gonadotropin Deficiency
3. Ovarian Follicle Function in Patients with Premature Ovarian Failure
4. Prevention of Osteoporosis in Men with Prostate Cancer
5. Leuprolide in Treating Adults With Hypogonadotropism
Related Studies:
Other Hypogonadism Clinical Trials
Other Maryland Clinical Trials
Other Bethesda Clinical Trials
Effects on the Brain of Lupron Induced Hypogonadotropic Hypogonadism with and without Testosterone Replacement
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