Normal Healthy Volunteers
Conditions
Brief summary
Repletion of testosterone (T) in older men drives Growth Hormone secretion after its aromatization to estradiol (E2) by potentiating endogenous GH drive.
Detailed description
Systemic concentrations of Te, E2, GH, Insulin-like Growth Factor-I and IGFBP-3 decline in healthy aging men. Relative sex-steroid deprivation accentuates GH and IGF-I depletion, since Te stimulates GH and IGF-I production in older men, hypogonadal males of all ages, and patients undergoing (genotypic female-to-male) gender reassignment. Tamoxifen blocks this effect of Te, suggesting involvement of E2 in GH's stimulation in men. E2 per se stimulates GH secretion in women. Because Te is converted to E2 by aromatization in the body, we postulate that E2 is the active moiety in men also. Moreover, we hypothesize that the decline of E2 in older men contributes to the fall in GH output. This has never been tested. From a clinical vantage, understanding the mechanistic basis of Te's drive of the somatotropic axis is especially relevant in boys with pubertal failure, adults with primary hypogonadism and men with aging-related hypoandrogenemia. In relation to aging in the male, testosterone and E2 bioavailabilities fall by 35-50% in the eighth compared with third decade of life. From a medical perspective, aging is accompanied by progressive osteopenia, sarcopenia and intra-abdominal obesity. These adverse outcomes are remediable by short-term replacement with Te and/or recombinant GH, thus linking GH/Te/E2 availability with key body-compositional features.
Interventions
Sponsors
Mayo Clinic
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
BASIC_SCIENCE
Masking
TRIPLE (Subject, Caregiver, Investigator)
Eligibility
Sex/Gender
MALE
Age
60 Years to 80 Years
Healthy volunteers
Yes
Inclusion criteria
Inclusion: * 60 healthy men (ages 60 to 80 y); * BMI 18-30 kg/m2 * Community dwelling; and voluntarily consenting Exclusion: * Recent use of psychotropic or neuroactive drugs (within five biological half-live); * Obesity (outside weight range above); * Laboratory test results not deemed physician acceptable, cholesterol \>250, triglycerides \> 300, BUN \>30 or creatinine \> 1.5 mg/dL, liver functions tests twice upper limit of normal, electrolyte abnormality, anemia; hemoglobin \<12.0 gm/dL * Drug or alcohol abuse, psychosis, depression, mania or severe anxiety; * Acute or chronic organ-system disease; * Endocrinopathy, other than primary thyroidal failure receiving replacement; untreated osteoporosis * Nightshift work or recent transmeridian travel (exceeding 3 time zones within 7 days of admission); * Acute weight change (loss or gain of \> 2 kg in 6 weeks); * Allergy to peanut oil (used in some injectable Te preparations) * Unwillingness to provide written informed consent. * PSA \> 4.0 ng/mL * History or suspicion of prostatic disease (elevated PSA, indeterminate nodule or mass, obstructive uropathy. * History of carcinoma (excluding localized basal cell carcinoma removed or surgically treated with no recurrence. * History of thrombotic arterial disease (stroke, TIA, MI, angina) or deep vein thrombophlebitis. * History of CHF, cardiac arrhythmias, congential QT prolongation, and medications used to treat cardiac arrhythmias * Gynecomastia \> 2 cm, untreated * Untreated gallbladder disease * History of smoking greater than one ppd.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| BioStatistical Analysis | Subjects will undergo 15-h overnight (2200 - 1300 h) fasting, 10-min blood sampling | The primary analytical outcome is the summed mass of GH secreted in pulses over the 15 h of overnight blood sampling. The outcome measure is relevant, since sex-steroid hormones and regulatory peptides uniquely control GH secretory-burst mass. |
Countries
United States
Outcome results
None listed