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- W2006091256 abstract "Kisspeptins, derived from the Kiss1 gene play a central role in activation of the hypothalamo-pituitary gonadal (HPG) axis via stimulation of GnRH neurons. Both Kiss1 and Kiss1R (receptor) mRNA levels are found to be low in pre-pubertal rats, but whether an increase in kisspeptin and/or its receptor is the primary component in the initiation of puberty and where in the hypothalamus regulation of the kisspeptin/Kiss1R system occurs is unresolved. Using immunohistochemistry and in situ hybridization, we analyzed the level of Kiss1 mRNA and kisspeptin-immunoreactivity in the anteroventral periventricular nucleus (AVPV) and the arcuate nucleus of male rats along pubertal development. Neurons expressing Kiss1 mRNA were first detected at PND15, but increased significantly around puberty, and declined again in the adult rat. While virtually no immunoreactive cell bodies were detectable in the AVPV at any age, numerous kisspeptin-positive neurons in the arcuate nucleus were detected in the adult rat. Increasing doses of kisspeptin-54 given peripherally to male rats at PND15, 30, 45, and 60 evoked roughly similar effects, as revealed by the induction of c-Fos in the pituitary and secretion of LH and testosterone. These results show that both Kiss1 mRNA and the peptide increase in arcuate nucleus along pubertal maturation. Since kisspeptin signaling is potentially functional, even for peripheral activation, and well before the kisspeptin neuronal system is fully matured, our data support that the regulation of kisspeptin synthesis and release are key events in puberty onset in the male rat." @default.
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- W2006091256 date "2010-02-01" @default.
- W2006091256 modified "2023-10-06" @default.
- W2006091256 title "Maturation of kisspeptinergic neurons coincides with puberty onset in male rats" @default.
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- W2006091256 doi "https://doi.org/10.1016/j.peptides.2009.11.017" @default.
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