Cited by 186Stress Responses and CortisolNeuroscience and Neuropharmacology ResearchNeuropeptides and Animal Physiology

GABAergic innervation of corticotropin-releasing hormone (CRH)-secreting parvocellular neurons and its plasticity as demonstrated by quantitative immunoelectron microscopy

Miklós, I.H, Kovács, K.J·2002·Neuroscience

Abstract

GABA has been identified as an important neurotransmitter in stress-related circuitry mediating inhibitory effects on neurosecretory neurons that comprise the central limb of the hypothalamo-pituitary-adrenocortical axis. Using combinations of pre-embedding immunostaining and postembedding immunogold methods at the ultrastructural level, direct synaptic contacts were revealed between GABA-containing terminals and neurosecretory cells that were immunoreactive for corticotropin-releasing hormone (CRH) in the hypothalamic paraventricular nucleus (PVN). The vast majority of axo-dendritic GABA synapses was symmetric (inhibitory) type, and 46% of all synaptic boutons in the medial parvocellular subdivision of the PVN were immunoreactive to GABA. Using the disector method, an unbiased stereological method on serial ultrathin sections, the total calculated number of synaptic contacts within the medial parvocellular subdivision of the PVN was 55.4 x 10(6)/mm(3). On CRH-positive profiles 20.1 x 10(6) GABAergic synaptic boutons were detected per mm(3) in control, colchicine-treated rats. In the medial parvocellular subdivision, 79% of GABAergic boutons terminated on CRH neurons. Following adrenalectomy, which increases the synthetic and secretory activities of CRH neurons, the number of GABAergic synapses that terminate on CRH-positive profiles was increased by 55%. GABA-containing boutons appeared to be swollen, while the contact surfaces of cellular membranes between GABAergic boutons and CRH-positive profiles were shorter in adrenalectomized animals than in controls. Our data provide ultrastructural evidence for direct inhibitory GABAergic control of stress-related CRH neurons and suggest a pivotal role of GABA-containing inputs in the functional plasticity of parvocellular neurosecretory neurons seen in response to adrenalectomy.

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Crossref · 10.1016/s0306-4522(02)00147-1

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Authors
Miklós, I. H., & Kovács, K. J.
Affiliations
HUN-REN Institute of Experimental Medicine (HU)
Corresponding author
Kovács, K.J
Venue
Neuroscience
Publisher
Elsevier BV
Published
2002-09
Volume
113
Issue
3
Pages
581-592
ISSN
0306-4522 (ISSN-L)
OpenAlex
W2091326035
Cited by
182
References
62
Citations by year
2026: 6 · 2025: 4 · 2024: 4 · 2023: 8 · 2022: 5 · 2021: 7 · 2020: 8 · 2019: 9 · 2018: 11 · 2017: 3 · 2016: 5 · 2015: 10 · 2014: 9 · 2013: 12 · 2012: 7
FWCI
2.48
Type
journal article
Language
en
Open access
closed
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
GABAergic innervation, corticotropin-releasing factor, parvocellular neurons, paraventricular nucleus, hypothalamic-pituitary-adrenal axis, GABAergic synapses, synaptic plasticity, adrenalectomy, stress response, neurosecretory cells, colchicine
MeSH terms
Adrenalectomy, Animals, Corticotropin-Releasing Hormone, gamma-Aminobutyric Acid, Immunohistochemistry, Male, Neuronal Plasticity, Neurons, Paraventricular Hypothalamic Nucleus, Synapses, Microscopy, Immunoelectron, Rats, Wistar, Presynaptic Terminals, Rats

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