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Hypothalamic Reproductive Endocrine Pulse Generator Activity Independent of Neurokinin B and Dynorphin Signaling.

Lippincott, MF, León, S, Chan, Y-M, Fergani, C, Talbi, R, Farooqi, IS, Jones, CM, Arlt, W, Stewart, SE, Cole, TR, Terasawa, E, Hall, JE, Shaw, ND, Navarro, VM and Seminara, SB (2019) Hypothalamic Reproductive Endocrine Pulse Generator Activity Independent of Neurokinin B and Dynorphin Signaling. Journal of Clinical Endocrinology & Metabolism, 104 (10). pp. 4304-4318. ISSN 0021-972X

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Open Access URL: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC67360... (Accepted version)

Abstract

CONTEXT: Kisspeptin-neurokinin B (NKB)-dynorphin neurons are critical regulators of the hypothalamic-pituitary-gonadal axis. NKB and dynorphin are hypothesized to influence the frequency of GnRH pulses, whereas kisspeptin is hypothesized to be a generator of the GnRH pulse. How these neuropeptides interact remains unclear. OBJECTIVE: To probe the role of NKB in GnRH pulse generation and to determine the interactions between NKB, kisspeptin, and dynorphin in humans and mice with a complete absence of NKB. DESIGN: Case/control. SETTING: Academic medical center. PARTICIPANTS: Members of a consanguineous family bearing biallelic loss-of-function mutations in the gene encoding NKB and NKB-deficient mice. INTERVENTIONS: Frequent blood sampling to characterize neuroendocrine profile and administration of kisspeptin, GnRH, and naloxone, a nonspecific opioid receptor antagonist used to block dynorphin. MAIN OUTCOME MEASURES: LH pulse characteristics. RESULTS: Humans lacking NKB demonstrate slow LH pulse frequency, which can be increased by opioid antagonism. Mice lacking NKB also demonstrate impaired LH secretion, which can be augmented with an identical pharmacologic manipulation. Both mice and humans with NKB deficiency respond to exogenous kisspeptin. CONCLUSION: The preservation of LH pulses in the absence of NKB and dynorphin signaling suggests that both peptides are dispensable for GnRH pulse generation and kisspeptin responsiveness. However, NKB and dynorphin appear to have opposing roles in the modulation of GnRH pulse frequency.

Item Type: Article
Uncontrolled Keywords: 1103 Clinical Sciences, 1114 Paediatrics and Reproductive Medicine
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Biological & Environmental Sciences (new Sep 19)
Publisher: Oxford University Press (OUP)
Related URLs:
Date Deposited: 16 Oct 2019 10:00
Last Modified: 16 Oct 2019 10:00
DOI or Identification number: 10.1210/jc.2019-00146
URI: http://researchonline.ljmu.ac.uk/id/eprint/11582

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