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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...
Altered testosterone feedback in pubertal male rats raised on reduced caloric intake
diet feedback FSH gonadotropins LH male nutrition
2009/2/23
A study was conducted to explore the hypothesis that reduced caloric intake increases the negative feedback efficacy of testosterone on gonadotropin secretion. Daily subcutaneous injections of testost...
Temporal Dissociation of Feedback and Direct Testicular Effects of Estradiol Benzoate in Male Rats
estradiol negative feedback direct testicular effects testicular incubations
2009/2/19
Studies were conducted to characterize the responses of the hypothalamic-pituitary-testicular axis to systemic injection of estradiol benzoate (EB) in the rat. Feedback effects of estrogens on the...
Significant role of 5 alpha-reductase on feedback effects of androgen in rat anterior pituitary cells demonstrated with a nonsteroidal 5 alpha-reductase inhibitor ONO-3805
Significant role 5 alpha-reductase androgen rat anterior pituitary cells
2009/2/12
A 5 alpha-reductase inhibitor with nonsteroidal structure, ONO-3805, has been used to study the role of 5 alpha-reductase on positive and negative feedback effects of androgen on gonadotropin secret...
Testosterone feedback on gonadotropin secretion and gene expression in transgenic mice expressing human growth hormone gene
Luteinizing hormone follicle-stimulating hormone
2009/2/12
To determine the effects of testosterone on the regulation of gonadotropins in metallothionein-1/human growth hormone (MT/hGH) transgenic mice, basal and gonadotropin-releasing hormone (GnRH)-stim...
Negative feedback regulation of pulsatile LH secretion during treatment with an LHRH antagonist in rams
LHRH antagonists steriod feedback hypothalamus pituitary gland testis testosterone
2009/2/6
Suppression of LH and testosterone secretion in sexually active rams by the short-term administration of an LHRH antagonist results in a compensatory increase in the release of LHRH from the hypot...
Feedback Inhibition of Gonadotropins by Testosterone in Men With Hypogonadotropic Hypogonadism: Comparison to the Intact Pituitary-Testicular Axis in Primary Hypogonadism
Gonadotropins Men Hypogonadotropic Hypogonadism Intact Pituitary-Testicular Axis Primary Hypogonadism
2008/12/24
Men with hypogonadotropic hypogonadism (HH) due to hypothalamic-pituitary disease present with low serum testosterone levels combined with undetectable, low, or normal gonadotropin levels. Treatment...