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- W2023353332 abstract "Exposure to chronic stressors results in dysregulation of the hypothalamic-pituitary-adrenal axis and a disruption in reproduction. CRH, the principal regulator of the hypothalamic-pituitary-adrenal axis induces the secretion of ACTH from the pituitary, which stimulates adrenal steroidogenesis via the specific cell-surface melanocortin 2 receptor (MC2R). Previously, we demonstrated that MC2R−/− mice had undetectable levels of corticosterone despite high ACTH levels. Here, we evaluated the reproductive functions of female MC2R−/− mice and analyzed the mechanism of the disrupted cyclicity of these mice. The expression of CRH in the paraventricular nucleus was significantly increased in MC2R−/− mice under nonstressed conditions. Although MC2R−/− females were fertile, they showed a prolonged estrous cycle. After hormonal stimulation, MC2R−/− females produced nearly-normal numbers of eggs, but slightly less than MC2R+/− females, and showed near-normal ovarian histology. During diestrus, the number of GnRH-positive cells in the medial preoptic area was significantly reduced in MC2R−/− females. CRH type 1 receptor antagonist restored estrous cyclicity in MC2R−/− females. Kisspeptin-positive areas in the arcuate nucleus were comparable, whereas kisspeptin-positive areas in the anteroventral periventricular nucleus in MC2R−/− females were significantly reduced compared with MC2R+/− females, suggesting that arcuate nucleus kisspeptin is not involved, but anteroventral periventricular nucleus kisspeptin may be involved, in the maintenance of estrous cyclicity. Our findings show that high levels of hypothalamic CRH disturb estrous cyclicity in the female animals and that the MC2R−/− female is a unique animal model of functional hypothalamic amenorrhea." @default.
- W2023353332 created "2016-06-24" @default.
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- W2023353332 date "2010-09-29" @default.
- W2023353332 modified "2023-10-05" @default.
- W2023353332 title "Functional Hypothalamic Amenorrhea Due to Increased CRH Tone in Melanocortin Receptor 2-Deficient Mice" @default.
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- W2023353332 doi "https://doi.org/10.1210/en.2010-0687" @default.
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