Hypothalamic-Pituitary-Gonadal Interactions during Spontaneous Testicular Recrudescence in Golden Hamsters
نویسندگان
چکیده
منابع مشابه
Spontaneous testicular recrudescence of Syrian hamsters: role of stimulatory photoperiods.
The gonads of hamsters maintained in short photoperiods first undergo regression and then spontaneous recrudescence. The latter is indicative of refractoriness of the neuroendocrine axis to short day lengths. We tested the hypothesis that the absence of long-day stimulation contributes to the development of refractoriness to short photoperiods. Male Syrian hamsters were maintained for 26 weeks ...
متن کاملCrossover of the Hypothalamic Pituitary–Adrenal/Interrenal, –Thyroid, and –Gonadal Axes in Testicular Development
Besides the well-known function of thyroid hormones (THs) for regulating metabolism, it has recently been discovered that THs are also involved in testicular development in mammalian and non-mammalian species. THs, in combination with follicle stimulating hormone, lead to androgen synthesis in Danio rerio, which results in the onset of spermatogenesis in the testis, potentially relating the hyp...
متن کاملTesticular apoptosis is down-regulated during spontaneous recrudescence in white-footed mice (Peromyscus leucopus).
Among individuals of many nontropical species, seasonal breeding is timed by tracking changes in the daily photoperiod. Transfer of rodents to short (< 12 h of light/day) day lengths for 6 to 14 weeks can induce regression of the testes mediated by apoptosis. After 16 to 20 weeks of short day exposure, reproductive function is "spontaneously" initiated, and testicular recrudescence is observed....
متن کاملThe Perinatal Effects of Lithium Carbonate on Hypothalamic-Pituitary-Gonadal in Adult Female Wistar Rats
Background & Objectives: Lithium is the metal used in bipolar disorder treatment. As for the prevalence of the disorder infertility (childbearing) age and the use of lithium, this study aimed at studying the effects of drugs on histological changes, and the ovarian function in the first generation of adult female offspring was performed. Materials & Methods: In this experimental study, 40 pre...
متن کاملActivation of the hypothalamic-pituitary-gonadal axis in infancy: minipuberty.
The hypothalamic-pituitary-gonadal (HPG) axis is active in the midgestational foetus but silenced towards term because of the negative feedback effects mediated by the placental hormones. This restraint is removed at birth, leading to reactivation of the axis and an increase in gonadotrophin levels. Gonadotrophin levels are high during the first 3 months of life but decrease towards the age of ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Biology of Reproduction
سال: 1979
ISSN: 0006-3363,1529-7268
DOI: 10.1095/biolreprod20.4.739