Cited by 96Neuroendocrine regulation and behaviorNeuroscience and Neuropharmacology ResearchNeuropeptides and Animal Physiology

Synaptic innervation to rat hippocampus by vasopressin-immuno-positive fibres from the hypothalamic supraoptic and paraventricular nuclei

Zhang, L., Hernández, V.S.·2013·Neuroscience

Abstract

The neuropeptide arginine vasopressin (AVP) exerts a modulatory role on hippocampal excitability through vasopressin V(1A) and V(1B) receptors. However, the origin and mode of termination of the AVP innervation of the hippocampus remain unknown. We have used light and electron microscopy to trace the origin, distribution and synaptic relationships of AVP-immuno-positive fibres and nerve terminals in the rat hippocampus. Immuno-positive fibres were present in all areas (CA1-3, dentate gyrus) of the whole septo-temporal extent of the hippocampus; they had the highest density in the CA2 region, strongly increasing in density towards the ventral hippocampus. Two types of fibres were identified, both establishing synaptic junctions. Type A had large varicosities packed with immuno-positive large-granulated peptidergic vesicles and few small clear vesicles forming type I synaptic junctions with pyramidal neuron dendrites, dendritic spines and with axonal spines. Type B had smaller varicosities containing mostly small clear vesicles and only a few large-granulated vesicles and established type II synaptic junctions mainly with interneuron dendrites. The AVP-positive axons in stratum oriens appeared to follow and contact metabotropic glutamate receptor 1α (mGluR1α)-immuno-positive interneuron dendrites. Fluoro-Gold injection into the hippocampus revealed retrogradely labelled AVP-positive somata in hypothalamic supraoptic and paraventricular nuclei. Hypothalamo-hippocampal AVP-positive axons entered the hippocampus mostly through a ventral route, also innervating the amygdala and to a lesser extent through the dorsal fimbria fornix, in continuation of the septal AVP innervation. Thus, it appears the AVP-containing neurons of the magnocellular hypothalamic nuclei serve as important sources for hippocampal AVP innervation, although the AVP-expressing neurons located in amygdala and bed nucleus of the stria terminalis reported previously may also contribute.

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Crossref · 10.1016/j.neuroscience.2012.10.010

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  • Oxytocin and vasopressin-expressing cells in the paraventricular and supraoptic nuclei send projections to the hippocampus, with the highest fiber density seen in the CA2 region for vasopressin and CA2/CA3 regions for oxytocin projections.

    “OXT and AVPexpressing cells in PVN and SON send projections to the hippocampus, with the highest fiber density seen in the CA2 region for AVP and CA2/CA3 regions for OXT projections (97-100).”

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Authors
Zhang, L., & Hernández, V. S.
Affiliations
Universidad Nacional Autónoma de México (MX)
Corresponding author
Zhang, L.
Venue
Neuroscience
Publisher
Elsevier BV
Published
2013-01
Volume
228
Pages
139-162
ISSN
0306-4522 (ISSN-L)
OpenAlex
W2024418933
Cited by
96
References
70
Citations by year
2026: 1 · 2025: 7 · 2024: 6 · 2023: 6 · 2022: 11 · 2021: 9 · 2020: 10 · 2019: 7 · 2018: 8 · 2017: 7 · 2016: 10 · 2015: 6 · 2014: 5 · 2013: 2 · 2012: 1
FWCI
6.74
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • CONACYT (79641, 127777)
  • PAPIIT-UNAM (IN218111)
Topics
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
vasopressin, hippocampus, supraoptic nucleus, paraventricular nucleus, magnocellular neurons, synaptic innervation, varicose axons, interneurons, pyramidal neurons, amygdala, bed nucleus of the stria terminalis, fimbria-fornix, retrograde tracing
MeSH terms
Animals, Arginine Vasopressin, Hippocampus, Hypothalamus, Anterior, Male, Nerve Fibers, Myelinated, Neural Pathways, Paraventricular Hypothalamic Nucleus, Synapses, Rats, Wistar, Rats

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