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Background: Andropause is the gradual reduction of the male sex hormone (testosterone) with increasing age. Its symptoms are sexual dysfunction, weakness, fatigue, insomnia, loss of motivation, mood d...
The circadian pattern in levels of serum total testosterone (T) in men becomes blunted with normal aging. However, because T not bound to sex hormone-binding globulin (non-SHBG-T) is felt to be a be...
Adult male Wistar rats were subjected to acute and chronic immobilization stress. Changes in plasma levels of LH, FSH and testosterone and in the content of testicular inhibin and testosterone wer...
The testosterone dose-dependency of several mating and nonmating behaviors was examined in the male rat, chemically castrated with a GnRH antagonist analog. Graded doses of testosterone enanthate ...
The direct peripheral effect of prolactin on LH-stimulated testosterone secretion was re-evaluated using the intact, isolated, perfused rat testis. In paired experiments, one testis was infused wi...
Two experiments were conducted with adult intact rams (approximately 58 kg in body weight) in the nonbreeding season to investigate interrelationships between LH and testosterone secretion. In Exp...
Increasing interest in events regulating gonadotropin synthesis and secretion led to the reexamination, by radioimmunoassay (RIA), of the pituitary content of luteinizing hormone (LH) and follicle s...
To elucidate the effects of sulpiride-induced (300 mg daily) long-term (64 days) hyperprolactinemia on basal and hCG-stimulated plasma testosterone (T), hCG was given to five normal men five times...
Men with low serum testosterone levels who do not have elevated serum LH levels are generally thought to have hypothalamic-pituitary dysfunction. To evaluate this concept, seven men with a combinati...
Plasma testosterone (T) and sex hormone binding globulin (SHBG) were assayed in normal controls (N = 9) and hypothyroid patients (N = 17) receiving increasing doses of L-T4 (0.2 mg, 0.4 mg for 30 da...
To assess the in vivo steroidogenic activity of desialylated human choriogonadotropin (hCG) in man, highly purified desialylated hCG was administered as a constant intravenous infusion over 6 hours ...
Four experiments were designed to investigate the influence of photoperiod and other environmental factors on androgen production and reproductive maturation in deer mice. Male prairie deer mice (Pe...
To determine if ram principal cells can synthesize or metabolize testosterone, or metabolize other steroids present in rete testis fluid, principal cells from the initial segment, central caput, and...
The pulsatile properties of gonadotropin and testosterone release were examined before and after chronic mu opiate receptor blockade with naltrexone, 50 mg every other day, in four normal boys in la...
The effects of adrenal steroids on testosterone and LH secretion and changes in serum cortisol levels in response to treatments were studied in the ram. Acute administration of synthetic ACTH (10 mi...

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