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Circadian variation in testosterone, sex hormone-binding globulin, and calculated non-sex hormone-binding globulin bound testosterone in healthy young and elderly men
Circadian variation testosterone sex hormone-binding globulin healthy young and elderly men
2009/2/23
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...
Effect of immobilization stress on testosterone and inhibin in male rats
immobilization stress testosterone inhibin male rats
2009/2/23
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...
Testosterone dose-dependency of sexual and nonsexual behaviors in the gonadotropin-releasing hormone antagonist-treated male rat
Testosterone dose-dependency sexual nonsexual behaviors gonadotropin-releasing hormone male rat
2009/2/23
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 ...
Effects of prolactin on luteinizing hormone-stimulated testosterone secretion in isolated perfused rat testis
prolactin testes luteinizing hormone testosterone secretion
2009/2/23
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...
The pattern of LH release in the adult ram influences the testicular steroidogenic response to individual LH pulses and is regulated by testosterone negative feedback
LH release adult ram influences testicular steroidogenic individual LH pulses
2009/2/23
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...
Pituitary gonadotropin content in gonadectomized rats. Immunoassay measurements influenced by extraction solvent and testosterone replacement
Pituitary gonadotropin content gonadectomized rats Immunoassay measurements extraction solvent
2009/2/23
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...
Effects of chronic sulpiride-induced hyperprolactinemia on plasma testosterone and its responses to hCG in normal men
Effects of chronic sulpiride-induced hyperprolactinemia plasma testosterone hCG normal men
2009/2/23
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...
Pituitary-testicular reserve in men with low serum testosterone and normal serum luteinizing hormone
Pituitary-testicular reserve men with low serum testosterone normal serum luteinizing hormone
2009/2/23
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...
Serum levels of total testosterone and sex hormone binding globulin in hypothyroid patients and normal subjects treated with incremental doses of L-T4 or L-T3
testosterone SHBG thyroid hormone hypothyroidism
2009/2/23
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...
Serum testosterone response to desialylated human choriogonadotropin in man
Serum testosterone desialylated human choriogonadotropin man
2009/2/23
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 ...
Influence of photoperiod, ambient temperature and melatonin on testosterone synthesis and release during reproductive maturation in male deer mice
photoperiod ambient temperature melatonin testosterone synthesis reproductive maturation male deer mice
2009/2/23
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...
Steroidogenesis and testosterone metabolism in cultured principal cells from the ram epididymis
Steroidogenesis testosterone metabolism cultured principal cells ram epididymis
2009/2/23
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...
Appraising the instantaneous secretory rates of luteinizing hormone and testosterone in response to selective mu opiate receptor blockade in late pubertal boys
instantaneous secretory rates luteinizing hormone testosterone selective mu opiate receptor blockade late pubertal boys
2009/2/23
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...
Effect of adrenal steroids on testosterone and luteinizing hormone secretion in the ram
adrenal steroids testosterone luteinizing hormone secretion ram
2009/2/23
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...
Different testosterone and LH relationships in infertile men
Different testosterone LH relationships infertile men
2009/2/23
In both man and animals, changes in Leydig cell structure and function accompany seminiferous tubule damage. In this study of 1745 men attending an infertility clinic, 14% of men with elevated lev...