Cited by 97Hypothalamic control of reproductive hormonesNeuropeptides and Animal PhysiologyNeuroendocrine regulation and behavior

Kisspeptin regulates prolactin release through hypothalamic dopaminergic neurons

Szawka, Raphael E., Ribeiro, Aline B., Leite, Cristiane M., Helena, Cleyde V. V., Franci, Celso R., Anderson, Greg M., Hoffman, Gloria E., Anselmo-Franci, Janete A.·2010·Endocrinology

Abstract

Prolactin (PRL) is tonically inhibited by dopamine (DA) released from neurons in the arcuate and periventricular nuclei. Kisspeptin plays a pivotal role in LH regulation. In rodents, kisspeptin neurons are found mostly in the anteroventral periventricular and arcuate nuclei, but the physiology of arcuate kisspeptin neurons is not completely understood. We investigated the role of kisspeptin in the control of hypothalamic DA and pituitary PRL secretion in adult rats. Intracerebroventricular kisspeptin-10 (Kp-10) elicited PRL release in a dose-dependent manner in estradiol (E2)-treated ovariectomized rats (OVX+E2), whereas no effect was found in oil-treated ovariectomized rats (OVX). Kp-10 increased PRL release in males and proestrous but not diestrous females. Associated with the increase in PRL release, intracerebroventricular Kp-10 reduced Fos-related antigen expression in tyrosine hydroxylase-immunoreactive (ir) neurons of arcuate and periventricular nuclei in OVX+E2 rats, with no effect in OVX rats. Kp-10 also decreased 3,4-dihydroxyphenylacetic acid concentration and 3,4-dihydroxyphenylacetic acid-DA ratio in the median eminence but not striatum in OVX+E2 rats. Double-label immunofluorescence combined with confocal microscopy revealed kisspeptin-ir fibers in close apposition to and in contact with tyrosine hydroxylase-ir perikarya in the arcuate. In addition, Kp-10 was not found to alter PRL release from anterior pituitary cell cultures regardless of E2 treatment. We provide herein evidence that kisspeptin regulates PRL release through inhibition of hypothalamic dopaminergic neurons, and that this mechanism is E2 dependent in females. These findings suggest a new role for central kisspeptin with possible implications for reproductive physiology.

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Crossref · 10.1210/en.2009-1414

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Authors
Szawka, R. E., Ribeiro, A. B., Leite, C. M., Helena, C. V. V., Franci, C. R., Anderson, G. M., Hoffman, G. E., & Anselmo-Franci, J. A.
Affiliations
  • Laboratório de Neuroendocrinologia (R.E.S., A.B.R., C.M.L., C.V.V.H., J.A.A.-F.), Departamento de Morfologia, Estomatologia e Fisiologia, Faculdade de Odontologia de Ribeirão Preto, 14040-904,
  • Universidade de São Paulo (BR)
  • University of Otago (NZ)
  • Morgan State University (US)
Venue
Endocrinology
Published
2010-04-21
Volume
151
Issue
7
Pages
3247-3257
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W2103812482
Cited by
97
References
63
Citations by year
2026: 2 · 2025: 4 · 2024: 4 · 2023: 3 · 2022: 5 · 2021: 4 · 2020: 9 · 2019: 9 · 2018: 5 · 2017: 3 · 2016: 7 · 2015: 11 · 2014: 7 · 2013: 8 · 2012: 5
FWCI
9.14
Type
journal article
Language
en
Open access
closed
Locations
  • Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
  • Scientific Electronic Library Online (São Paulo Research Foundation, Latin American and Caribbean Center on Health Sciences Information, Conselho Nacional de Desenvolvimento Científico e Tecnológico) (publishedVersion)
Funders
Universidade de São Paulo
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
Keywords
kisspeptin, prolactin secretion, arcuate nucleus, periventricular nucleus, tyrosine hydroxylase, Fos-related antigen, dopamine, kisspeptin-10, median eminence, ovariectomy, reproductive physiology
MeSH terms
Animals, Cells, Cultured, Chromatography, High Pressure Liquid, Dopamine, Female, Hypothalamus, Immunohistochemistry, Male, Neurons, Oligopeptides, Prolactin, Radioimmunoassay, Dinoprostone, Rats, Sprague-Dawley, Rats, Wistar, Rats, Kisspeptins

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