Forebrain projections of arcuate neurokinin b neurons demonstrated by anterograde tract-tracing and monosodium glutamate lesions in the rat

S. J. Krajewski, M. C. Burke, M. J. Anderson, N. T. Mcmullen, Naomi E Rance

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

Neurokinin B (NKB) and kisspeptin receptor signaling are essential components of the reproductive axis. A population of neurons resides within the arcuate nucleus of the rat that expresses NKB, kisspeptin, dynorphin, NK3 receptors and estrogen receptor α (ERα). Here we investigate the projections of these neurons using NKB-immunocytochemistry as a marker. First, the loss of NKB-immunoreactive (ir) somata and fibers was characterized after ablation of the arcuate nucleus by neonatal injections of monosodium glutamate. Second, biotinylated dextran amine was injected into the arcuate nucleus and anterogradely labeled NKB-ir fibers were identified using dual-labeled immunofluorescence. Four major projection pathways are described: (1) local projections within the arcuate nucleus bilaterally, (2) projections to the median eminence including the lateral palisade zone, (3) projections to a periventricular pathway extending rostrally to multiple hypothalamic nuclei, the septal region and BNST and dorsally to the dorsomedial nucleus and (4) Projections to a ventral hypothalamic tract to the lateral hypothalamus and medial forebrain bundle. The diverse projections provide evidence that NKB/kisspeptin/dynorphin neurons could integrate the reproductive axis with multiple homeostatic, behavioral and neuroendocrine processes. Interestingly, anterograde tract-tracing revealed NKB-ir axons originating from arcuate neurons terminating on other NKB-ir somata within the arcuate nucleus. Combined with previous studies, these experiments reveal a bilateral interconnected network of sexsteroid responsive neurons in the arcuate nucleus of the rat that express NKB, kisspeptin, dynorphin, NK3 receptors and ERα and project to GnRH terminals in the median eminence. This circuitry provides a mechanism for bilateral synchronization of arcuate NKB/kisspeptin/dynorphin neurons to modulate the pulsatile secretion of GnRH.

Original languageEnglish (US)
Pages (from-to)680-697
Number of pages18
JournalNeuroscience
Volume166
Issue number2
DOIs
StatePublished - Mar 17 2010

Fingerprint

Neurokinin B
Sodium Glutamate
Prosencephalon
Kisspeptins
Arcuate Nucleus of Hypothalamus
Neurons
Dynorphins
Median Eminence
Carisoprodol
Gonadotropin-Releasing Hormone
Estrogen Receptors
Neurokinin-3 Receptors
Lateral Hypothalamic Area
Medial Forebrain Bundle
Septum of Brain
Mediodorsal Thalamic Nucleus
Fluorescent Antibody Technique
Axons
Immunohistochemistry

Keywords

  • Dynorphin
  • Estrogen
  • GnRH
  • Kisspeptin
  • LH
  • Reproduction

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Forebrain projections of arcuate neurokinin b neurons demonstrated by anterograde tract-tracing and monosodium glutamate lesions in the rat. / Krajewski, S. J.; Burke, M. C.; Anderson, M. J.; Mcmullen, N. T.; Rance, Naomi E.

In: Neuroscience, Vol. 166, No. 2, 17.03.2010, p. 680-697.

Research output: Contribution to journalArticle

Krajewski, S. J. ; Burke, M. C. ; Anderson, M. J. ; Mcmullen, N. T. ; Rance, Naomi E. / Forebrain projections of arcuate neurokinin b neurons demonstrated by anterograde tract-tracing and monosodium glutamate lesions in the rat. In: Neuroscience. 2010 ; Vol. 166, No. 2. pp. 680-697.
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