title: The development of kisspeptin circuits in the Mammalian brain.
abstract: The neuropeptide kisspeptin, encoded by the Kiss1 gene, is required for mammalian puberty and fertility. Examining the development of the kisspeptin system contributes to our understanding of pubertal progression and adult reproduction and sheds light on possible mechanisms underlying the development of reproductive disorders, such as precocious puberty or hypogonadotropic hypogonadism. Recent work, primarily in rodent models, has begun to study the development of kisspeptin neurons and their regulation by sex steroids and other factors at early life stages. In the brain, kisspeptin is predominantly expressed in two areas of the hypothalamus, the anteroventral periventricular nucleus and neighboring periventricular nucleus (pre-optic area in some species) and the arcuate nucleus. Kisspeptin neurons in these two hypothalamic regions are differentially regulated by testosterone and estradiol, both in development and in adulthood, and also display differences in their degree of sexual dimorphism. In this chapter, we discuss what is currently known and not known about the ontogeny, maturation, and sexual differentiation of kisspeptin neurons, as well as their regulation by sex steroids and other factors during development.
authors.affiliation: Department of Reproductive Medicine, University of California, La Jolla, CA 92093, USA. ssemaan@ucsd.edu
authors.forename: Sheila J
authors.initials: SJ
authors.lastname: Semaan
authors.forename: Kristen P
authors.initials: KP
authors.lastname: Tolson
authors.forename: Alexander S
authors.initials: AS
authors.lastname: Kauffman
mesh_terms: D000328:Adult; D000818:Animals; D020643:Anterior Thalamic Nuclei / Q000254:growth & development* / Q000378:metabolism; D001111:Arcuate Nucleus of Hypothalamus / Q000254:growth & development* / Q000378:metabolism; D004958:Estradiol / Q000378:metabolism; D005260:Female; D005786:Gene Expression Regulation / Q000502:physiology; D006801:Humans; D007006:Hypogonadism / Q000378:metabolism; D059648:Kisspeptins / Q000378:metabolism*; D008297:Male; D011627:Puberty / Q000502:physiology; D011629:Puberty, Precocious / Q000378:metabolism; D012098:Reproduction / Q000502:physiology; D012727:Sex Characteristics; D013739:Testosterone / Q000378:metabolism
chemical_list: C106628:KISS1 protein, human; D059648:Kisspeptins; D013739:Testosterone; D004958:Estradiol
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