title: Neuroanatomy of the kisspeptin signaling system in mammals: comparative and developmental aspects.
abstract: Our understanding of kisspeptin and its actions depends, in part, on a detailed knowledge of the neuroanatomy of the kisspeptin signaling system in the brain. In this chapter, we will review our current knowledge of the distribution of kisspeptin cells, fibers, and receptors in the mammalian brain, including the development, phenotype, and projections of different kisspeptin subpopulations. A fairly consistent picture emerges from this analysis. There are two major groups of kisspeptin cell bodies: a large number in the arcuate nucleus (ARC) and a smaller collection in the rostral periventricular area of the third ventricle (RP3V) of rodents and preoptic area (POA) of non-rodents. Both sets of neurons project to GnRH cell bodies, which contain Kiss1r, and the ARC kisspeptin population also projects to GnRH axons in the median eminence. ARC kisspeptin neurons contain neurokinin B and dynorphin, while a variable percentage of those cells in the RP3V of rodents contain galanin and/or dopamine. Neurokinin B and dynorphin have been postulated to contribute to the control of GnRH pulses and sex steroid negative feedback, while the role of galanin and dopamine in rostral kisspeptin neurons is not entirely clear. Kisspeptin neurons, fibers, and Kiss1r are found in other areas, including widespread areas outside the hypothalamus, but their physiological role(s) in these regions remains to be determined.
authors.affiliation: Department of Neurobiology and Anatomical Sciences, University of Mississippi Medical Center, Jackson, MS, USA. mlehman@umc.edu
authors.forename: Michael N
authors.initials: MN
authors.lastname: Lehman
authors.forename: Stanley M
authors.initials: SM
authors.lastname: Hileman
authors.forename: Robert L
authors.initials: RL
authors.lastname: Goodman
mesh_terms: D000818:Animals; D001111:Arcuate Nucleus of Hypothalamus / Q000033:anatomy & histology / Q000196:embryology*; D001369:Axons / Q000378:metabolism; D004399:Dynorphins / Q000378:metabolism; D019004:Galanin / Q000378:metabolism; D007987:Gonadotropin-Releasing Hormone / Q000378:metabolism; D006801:Humans; D059648:Kisspeptins / Q000378:metabolism*; D015287:Neurokinin B / Q000378:metabolism; D011301:Preoptic Area / Q000033:anatomy & histology / Q000196:embryology*; D043562:Receptors, G-Protein-Coupled / Q000378:metabolism*; D000074502:Receptors, Kisspeptin-1; D015398:Signal Transduction / Q000502:physiology*; D020542:Third Ventricle / Q000033:anatomy & histology / Q000196:embryology*
chemical_list: C106628:KISS1 protein, human; C118688:KISS1R protein, human; D059648:Kisspeptins; D043562:Receptors, G-Protein-Coupled; D000074502:Receptors, Kisspeptin-1; D007987:Gonadotropin-Releasing Hormone; D004399:Dynorphins; D015287:Neurokinin B; D019004:Galanin
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