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The regulation of the proliferation and differentiation of rat Leydig cell precursor cells after EDS administration or daily HCG treatment
Leydig cell Leydig cell precursor LH hCG EDS proliferation
2009/2/23
The proliferation and differentiation of possible Leydig cell precursors in adult rats were studied after destruction of the existing Leydig cells with EDS or after daily treatment with hCG. After 2...
Regulation of gonadotropin secretion in the male: effect of an aromatization inhibitor in estradiol-implanted, orchidectomized dogs
gonadotropins testosterone estradiol aromatase aminoglutethim
2009/2/23
Testosterone is aromatized to estradiol in both peripheral tissues and the central nervous system. Various authors have suggested that this conversion in the male may be prerequisite for the regulat...
Evidence that estrogen regulation of testosterone secretion in adult rams is mediated by both indirect（gonadotropin dependent）and direct（gonadotropin independent）means
estrogen regulation testosterone secretion adult rams
2009/2/23
Involvement of endogenous estrogen in the regulation of gonadotropin and testosterone secretion was investigated in adult rams. Groups of four rams were either passively immunized against estradio...
The hormonal regulation of premeiotic steps of spermatogenesis in the newborn rat
mmature testis follicle stimulating hormone newborn rats testosterone propionate testicular
2009/2/20
the effect of high doses of testosterone propionate (TP) on the development of the first spermatogenic wave was systematically analyzed to determine the period of maximal susceptibility to testoster...
Regulation of rat caput epididymidis contractility by prostaglandins
epididymis sperm transport prostaglandins rat
2009/2/20
Mechanical activity of the rat caput epididymidis in vitro was recorded using a videomicrography system. The effects of prostaglandin (PG)F2 alpha, PGE2, and aspirin on caput epididymidis contractil...
Orchiectomy in young rats results in differential regulation of follicle-stimulating hormone and luteinizing hormone content
LH FSH synthesis regulation
2009/2/20
While it is generally accepted that GnRH stimulates release of pituitary gonadotropins, it is not clear what regulates synthesis. The orchiectomized immature rat, with sustained high plasma levels o...
Regulation of gonadotropin secretion in the male dog. Role of estradiol
gonadotropin secretion male dog
2009/2/19
Steroid regulation of pituitary LH and FSH secretion in the male may be mediated via the direct action of testosterone, or via the conversion of testosterone to either dihydrotestosterone (DHT) or e...
Regulation of testicular ornithine decarboxylase in vitro. Effect of age, follicle-stimulating hormone, and luteinizing hormone
rat testis omithine decarboxylase aging
2009/2/19
We have examined hormonal regulation of ornithine decarboxylase (ODC) activity in decapsulated rat testis, isolated testicular interstitial cells, and purified Leydig cells under defined conditions ...
The Regulation of Gonadotrophin Secretion in Immature Ethanol-Treated Male Rats
ethanol puberty gonadotrophin regulation LH
2009/2/19
Exposure of immature male rats to 5% (w/v) ethanol as the sole drinking fluid from weaning age (21 days of age) resulted in a delay in balanopreputial separation (41.3 ± 1.4 days versus 37.6 ± 2.0 d...
Aging in the AXC Rat：Androgen Regulation of Prostate Prolactin Receptors
aging rat prostate receptors prolactin
2009/2/18
Prolactin receptor content of ventral prostates of young mature (4-5-month-old), adult (12-13-month-old), and aged (24-27-month-old) untreated AXC rats was 677 ± 151, 826 ± 242, and 213 ± 59 (P < 0.01...
Testosterone Regulation of Follicle-stimulating Hormone Secretion in the Male Dog
testosterone FSH polydimethylsiloxane
2009/2/18
Studies were carried out to determine the effect of various numbers of testosterone-filled polydimethylsiloxane (PDS)capsules on plasma concentrations of testosterone and FSH in acutely orchidectomi...
Regional variation in macrophage antigen expression by murine epididymal basal cells and their regulation by testicular factors
Epididymis efferent duct ligation F4/80 Mac-i
2009/2/18
Factors controlling the appearance in the epididymis of basal cells and their expression of macrophage antigens were examined by ligating the efferent ducts to prevent the entry of spermatozoa in ad...
Regional variation in macrophage antigen expression by murine epididymal basal cells and their regulation by testicular factors
Epididymis efferent duct ligation F4/80 Mac-i
2009/2/18
Factors controlling the appearance in the epididymis of basal cells and their expression of macrophage antigens were examined by ligating the efferent ducts to prevent the entry of spermatozoa in ad...
Effect of N-acetylsphingosine (C2) and the ceramidase inhibitor (1S,2R)-D-erythro-2-（N-myristoylamino）-1-phenyl-1-propanol on the regulation of Sertoli cell function
N-acetylsphingosine (C2) (1S,2R)-D-erythro-2-（N-myristoylamino）-1-phenyl-1-propanol Sertoli cell function
2009/2/18
In the present study, a possible role of ceramide in the regulation of Sertoli cell function was investigated. Intracellular ceramide levels were increased by adding N-acetylsphingosine (C2) or by i...
Evidence for the role of heterotrimeric guanine nucleotide-binding regulatory proteins in the regulation of the mouse sperm adenylyl cyclase by the egg's zona pellucida
Pertussis toxin acrosome reaction mastoparan cyclic
2009/2/18
Sperm acrosomal exocytosis is the result of a complex set of signal transduction pathways activated physiologically by the egg's extracellular matrix, the zona pellucida. In the mouse, the zona pe...