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- W1967909531 endingPage "1853" @default.
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- W1967909531 abstract "Puberty in primates is timed by 2 hypothalamic events: during late infancy a decline in pulsatile GnRH release occurs, leading to a hypogonadotropic state that maintains quiescence of the prepubertal gonad; and in late juvenile development, pulsatile GnRH release is reactivated and puberty initiated, a phase of development that is dependent on kisspeptin signaling. In the present study, we determined whether the arrest of GnRH pulsatility in infancy was associated with a change in kisspeptin expression in the mediobasal hypothalamus (MBH). Kisspeptin was determined using immunohistochemistry in coronal hypothalamic sections from agonadal male rhesus monkeys during early infancy when GnRH release as reflected by circulating LH concentrations was robust and compared with that in juveniles in which GnRH pulsatility was arrested. The distribution of immunopositive kisspeptin neurons in the arcuate nucleus of the MBH of infants was similar to that previously reported for adults. Kisspeptin cell body number was greater in infants compared with juveniles, and at the middle to posterior level of the arcuate nucleus, this developmental difference was statistically significant. Neurokinin B in the MBH exhibited a similar distribution to that of kisspeptin and was colocalized with kisspeptin in approximately 60% of kisspeptin perikarya at both developmental stages. Intensity of GnRH fiber staining in the median eminence was robust at both stages. These findings indicate that the switch that shuts off pulsatile GnRH release during infancy and that guarantees the subsequent quiescence of the prepubertal gonad involves a reduction in a stimulatory kisspeptin tone to the GnRH neuronal network." @default.
- W1967909531 created "2016-06-24" @default.
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- W1967909531 date "2013-03-22" @default.
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- W1967909531 title "The Decline in Pulsatile GnRH Release, as Reflected by Circulating LH Concentrations, During the Infant-Juvenile Transition in the Agonadal Male Rhesus Monkey (Macaca mulatta) Is Associated With a Reduction in Kisspeptin Content of KNDy Neurons of the Arcuate Nucleus in the Hypothalamus" @default.
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- W1967909531 doi "https://doi.org/10.1210/en.2012-2154" @default.
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