Cited by 150Hypothalamic control of reproductive hormonesNeuropeptides and Animal PhysiologyRegulation of Appetite and Obesity

Regulation of Arcuate Neurons Coexpressing Kisspeptin, Neurokinin B, and Dynorphin by Modulators of Neurokinin 3 and κ-Opioid Receptors in Adult Male Mice

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Ruka, Kristen A., Burger, Laura L., Moenter, Suzanne M.·2013·Endocrinology

Abstract

Pulsatile GnRH release is essential to fertility and is modulated by gonadal steroids, most likely via steroid-sensitive afferents. Arcuate neurons coexpressing kisspeptin, neurokinin B (NKB), and dynorphin (KNDy neurons) are steroid-sensitive and have been postulated to both generate GnRH pulses and mediate steroid feedback on pulse frequency. KNDy neurons are proposed to interact with one another via NKB and dynorphin to activate and inhibit the KNDy network, respectively, and thus alter kisspeptin output to GnRH neurons. To test the roles of NKB and dynorphin on KNDy neurons and the steroid sensitivity of these actions, targeted extracellular recordings were made of Tac2(NKB)-GFP-identified neurons from castrate and intact male mice. Single-cell PCR confirmed most of these cells had a KNDy phenotype. The neurokinin 3 receptor (NK3R) agonist senktide increased action potential firing activity of KNDy neurons. Dynorphin reduced spontaneous KNDy neuron activity, but antagonism of κ-opioid receptors (KOR) failed to induce firing activity in quiescent KNDy neurons. Senktide-induced activation was greater in KNDy neurons from castrate mice, whereas dynorphin-induced suppression was greater in KNDy neurons from intact mice. Interactions of dynorphin with senktide-induced activity were more complex; dynorphin treatment after senktide had no consistent inhibitory effect, whereas pretreatment with dynorphin decreased senktide-induced activity only in KNDy neurons from intact but not castrate mice. These data suggest dynorphin-mediated inhibition of senktide-induced activity requires gonadal steroid feedback. Together, these observations support the hypotheses that activation of NK3R and KOR, respectively, excites and inhibits KNDy neurons and that gonadal steroids modulate these effects.

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Crossref · 10.1210/en.2013-1268

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Authors
Ruka, K. A., Burger, L. L., & Moenter, S. M.
Affiliations
University of Michigan (US)
Corresponding author
Moenter, Suzanne M.
Venue
Endocrinology
Published
2013-08-01
Volume
154
Issue
8
Pages
2761-2771
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W2001560124
Cited by
150
References
72
Citations by year
2026: 5 · 2025: 10 · 2024: 12 · 2023: 12 · 2022: 13 · 2021: 15 · 2020: 8 · 2019: 12 · 2018: 13 · 2017: 7 · 2016: 8 · 2015: 9 · 2014: 21 · 2013: 5
FWCI
17.37
Type
journal article
Language
en
Open access
Locations
  • Endocrinology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Eunice Kennedy Shriver National Institute of Child Health and Human Development (R01 HD34860, R01HD034860)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
Keywords
kisspeptin, neurokinin B, dynorphin, KNDy neurons, arcuate nucleus, neurokinin-3 receptor, kappa opioid receptor, senktide, gonadal steroid feedback, pulsatile GnRH release, neuronal firing, castration
MeSH terms
Animals, Arcuate Nucleus of Hypothalamus, Dynorphins, Gonadotropin-Releasing Hormone, Male, Membrane Potentials, Mice, Transgenic, Neurons, Orchiectomy, Peptide Fragments, Pyrrolidines, Substance P, Time Factors, Neurokinin B, Receptors, Opioid, kappa, Receptors, Neurokinin-3, Benzeneacetamides, Green Fluorescent Proteins, Mice, Kisspeptins

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