Cited by 213Neuropeptides and Animal PhysiologyStress Responses and CortisolNeurotransmitter Receptor Influence on Behavior

Corticotropin-Releasing Factor Increases In Vitro Firing Rates of Serotonergic Neurons in the Rat Dorsal Raphe Nucleus: Evidence for Activation of a Topographically Organized Mesolimbocortical Serotonergic System

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Lowry, Christopher A., Rodda, Joanne E., Lightman, Stafford L., Ingram, Colin D.·2000·The Journal of Neuroscience

Abstract

In vivo studies suggest that the stress-related neuropeptide corticotropin-releasing factor (CRF) modulates serotonergic neurotransmission. To investigate the underlying mechanisms for this interaction, the present study examined the effects of CRF in vitro on dorsal raphe neurons that displayed electrophysiological and pharmacological properties consistent with a serotonergic phenotype. In the presence of either 1 or 2 mm Ca(2+), perfusion of ovine CRF or rat/human CRF rapidly and reversibly increased firing rates of a subpopulation (19 of 70, 27%) of serotonergic neurons predominantly located in the ventral portion of the dorsal raphe nucleus. For a given responsive neuron, the excitatory effects of CRF were reproducible, and there was no tachyphylaxis. Excitatory effects were dose-dependent (over the range of 0.1-1.6 micrometer) and were completely absent after exposure to the competitive CRF receptor antagonists alpha-helical CRF(9-41) or rat/human [d-Phe(12), Nle(21, 38), alpha-Me-Leu(37)]-CRF(12-41). Both the proportion of responsive neurons and the magnitude of excitatory responses to CRF in the ventral portion of the caudal dorsal raphe nucleus were markedly potentiated in slices prepared from animals previously exposed to isolation and daily restraint stress for 5 d. Immunohistochemical staining of the recorded slices revealed close associations between CRF-immunoreactive varicose axons and tryptophan hydroxylase-immunoreactive neurons in the area of the recordings, providing anatomical evidence for potential direct actions of CRF on serotonergic neurons. The electrophysiological properties and the distribution of responsive neurons within the dorsal raphe nucleus are consistent with the hypothesis that endogenous CRF activates a topographically organized mesolimbocortical serotonergic system.

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Crossref · 10.1523/jneurosci.20-20-07728.2000

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  • DRN 5-HT neurons in different subregions express different G protein-coupled receptors and vesicular transporters.

    “Although DRN 5-HT neurons share a common developmental lineage (Deneris and Gaspar, 2018; Jensen et al., 2008), DRN 5-HT neurons in different subregions express different G protein-coupled receptors and vesicular transporters, suggesting spatial clustering of functionally specialized neurons (Calizo et al., 2011; Fernandez et al., 2016; Lowry et al., 2000; Templin et al., 2012).”

    From Molecular and anatomical organization of the dorsal raphe nucleus (2019) · cites this paper as Lowry et al., 2000

  • Even bona fide DRN 5-HT neurons are molecularly, anatomically, and physiologically heterogeneous.

    “Even bona fide DRN 5-HT neurons are molecularly, anatomically, and physiologically heterogeneous.”

    From Molecular and anatomical organization of the dorsal raphe nucleus (2019) · cites this paper as Lowry et al., 2000

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Authors
Lowry, C. A., Rodda, J. E., Lightman, S. L., & Ingram, C. D.
Affiliations
University of Bristol (GB)
Venue
The Journal of Neuroscience
Published
2000-10-15
Volume
20
Issue
20
Pages
7728-7736
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2109594449
Cited by
211
References
113
Citations by year
2026: 2 · 2025: 2 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 6 · 2019: 4 · 2018: 5 · 2017: 4 · 2016: 5 · 2015: 7 · 2014: 8 · 2013: 5 · 2012: 8
FWCI
5.00
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Newcastle University ePrints (Newcastle Univesity)
Funders
Wellcome Trust (045843/Z/95/Z)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
corticotropin-releasing factor, dorsal raphe nucleus, serotonergic neurons, neuronal firing rate, CRF receptor antagonists, tryptophan hydroxylase, stress, isolation stress, restraint stress, topographic organization
MeSH terms
Action Potentials, Animals, Axons, Calcium, Corticotropin-Releasing Hormone, Dose-Response Relationship, Drug, Immunohistochemistry, Male, Microelectrodes, Synaptic Transmission, Neurons, Raphe Nuclei, Reaction Time, Restraint, Physical, Serotonin, Stress, Physiological, Tryptophan Hydroxylase, Rats, Wistar, Serotonin Receptor Agonists, Rats, In Vitro Techniques

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