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Sökning: WFRF:(Lux T) > (2010-2014)

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  • Gonzalez, Betina, et al. (författare)
  • Endogenously elevated androgens alter the developmental programming of the hypothalamic-pituitary axis in male mice.
  • 2011
  • Ingår i: Molecular and cellular endocrinology. - : Elsevier BV. - 1872-8057 .- 0303-7207. ; 332:1-2, s. 78-87
  • Tidskriftsartikel (refereegranskat)abstract
    • Transgenic male mice that express human chorionic gonadotropin (hCG) α and β subunits constitutively hypersecrete hCG and produce elevated levels of androgens. The aim of this study was to characterize the hypothalamic-pituitary function of these transgenic (hCGαβ+) males by focusing on FSH regulation. Serum FSH levels and pituitary mRNA expression of Fshb, Lhb, Cga, Gnrhr and Esr1 were reduced, whereas Fst expression was increased in prepubertal hCGαβ+ males as compared with wild-type. In the hypothalamus, Cyp19a1 expression, GnRH concentration and ex-vivo GnRH pulsatility were elevated in prepubertal hCGαβ+ mice, whereas Kiss1 expression was decreased prepubertally and Gad67 expression was elevated neonatally. The effect of androgens on the developmental programming of the hypothalamic-pituitary axis of hCGαβ+ males was evaluated by perinatal and prepubertal antiandrogen (flutamide) administration. Our studies identified a critical window between gestational day 18 and postnatal day 14, during which chronically elevated androgens and/or their locally produced metabolites activate the hypothalamus and concomitantly shut-down the gonadotropin axis.
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