Cited by 256Neurotransmitter Receptor Influence on BehaviorNeuropeptides and Animal PhysiologyNeuroscience and Neuropharmacology Research

Corticotropin‐releasing factor increases mouse ventral tegmental area dopamine neuron firing through a protein kinase C‐dependent enhancement of Ih

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Wanat, M. J., Hopf, F. W., Stuber, G. D., Phillips, P. E. M., Bonci, A.·2008·The Journal of Physiology

Abstract

Stress induces the release of the peptide corticotropin‐releasing factor (CRF) into the ventral tegmental area (VTA), and also increases dopamine levels in brain regions receiving dense VTA input. Therefore, stress may activate the mesolimbic dopamine system in part through the actions of CRF in the VTA. Here, we explored the mechanism by which CRF affects VTA dopamine neuron firing. Using patch‐clamp recordings from brain slices we first determined that the presence of Ih is an excellent predictor of dopamine content in mice. We next showed that CRF dose‐dependently increased VTA dopamine neuron firing, which was prevented by antagonism of the CRF receptor‐1 (CRF‐R1), and was mimicked by CRF‐R1 agonists. Inhibition of the phospholipase C (PLC)–protein kinase C (PKC) signalling pathway, but not the cAMP–protein kinase A (PKA) signalling pathway, prevented the increase in dopamine neuron firing by CRF. Furthermore, the effect of CRF on VTA dopamine neurons was not attenuated by blockade of IA,IK(Ca)or IKir, but was completely eliminated by inhibition of Ih. Although cAMP‐dependent modulation of Ih through changes in the voltage dependence of activation is well established, we surprisingly found that CRF, through a PKC‐dependent mechanism, enhanced Ih independent of changes in the voltage dependence of activation. Thus, our results demonstrated that CRF acted on the CRF‐R1 to stimulate the PLC–PKC signalling pathway, which in turn enhanced Ih to increase VTA dopamine neuron firing. These findings provide a cellular mechanism of the interaction between CRF and dopamine, which can be involved in promoting the avoidance of threatening stimuli, the pursuit of appetitive behaviours, as well as various psychiatric conditions.

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Authors
Wanat, M. J., Hopf, F. W., Stuber, G. D., Phillips, P. E. M., & Bonci, A.
Affiliations
  • University of California, San Francisco (US)
  • Ernest Gallo Clinic and Research Center (US)
  • University of Washington (US)
Corresponding author
Bonci, A.
Venue
The Journal of Physiology
Publisher
Wiley
Published
2008-04-14
Volume
586
Issue
8
Pages
2157-2170
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W2146291241
Cited by
256
References
74
Citations by year
2026: 2 · 2025: 8 · 2024: 4 · 2023: 10 · 2022: 18 · 2021: 6 · 2020: 5 · 2019: 16 · 2018: 20 · 2017: 20 · 2016: 18 · 2015: 14 · 2014: 17 · 2013: 24 · 2012: 17
FWCI
8.22
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (7r01da016782-09)
  • University of California, San Francisco
  • National Institute on Drug Abuse (F31 DA21464-01, F31DA021464, R01 DA016782-04, R01-DA016782)
  • USAF Phillips Laboratory
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
corticotropin-releasing factor, ventral tegmental area, dopaminergic neurons, protein kinase C, phospholipase C, CRF1 receptor, mesolimbic dopamine system, stress, neuronal firing, voltage dependence of activation
MeSH terms
Action Potentials, Animals, Corticotropin-Releasing Hormone, Dopamine, Dose-Response Relationship, Drug, Membrane Potentials, Mice, Inbred C57BL, Mice, Transgenic, Neurons, Protein Kinase C, Ventral Tegmental Area, Patch-Clamp Techniques, Mice

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