Cited by 1,637Neurotransmitter Receptor Influence on BehaviorNeuropeptides and Animal PhysiologyNeuroscience and Neuropharmacology Research

Opioids excite dopamine neurons by hyperpolarization of local interneurons

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Johnson, SW, North, RA·1992·The Journal of Neuroscience

Abstract

Increased activity of dopamine-containing neurons in the ventral tegmental area is necessary for the reinforcing effects of opioids and other abused drugs. Intracellular recordings from these cells in slices of rat brain in vitro showed that opioids do not affect the principal (dopamine-containing) neurons but hyperpolarize secondary (GABA- containing) interneurons. Experiments with agonists and antagonists selective for opioid receptor subtypes indicated that the hyperpolarization of secondary cells involved the mu-receptor. Most principal cells showed spontaneous bicuculline-sensitive synaptic potentials when the extracellular potassium concentration was increased from 2.5 to 6.5 or 10.5 mM; these were prevented by TTX and assumed to result from action potentials arising in slightly depolarized local interneurons. The frequency of these synaptic potentials, but not their amplitudes, was reduced by opioids selective for mu-receptors. It is concluded that hyperpolarization of the interneurons by opioids reduces the spontaneous GABA-mediated synaptic input to the dopamine cells. In vivo, this would lead to excitation of the dopamine cells by disinhibition, which would be expected to contribute to the positive reinforcement seen with mu-receptor agonists such as morphine and heroin.

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Crossref · 10.1523/jneurosci.12-02-00483.1992

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  1. Mugnaini E, Oertel WH (1985) An atlas of the distribution of GA- BAergic neurons and terminals in the rat CNS as revealed by GAD immunohistochemistry. In: Handbook of chemical neuroanatomy, Vol 4 (Bjorklund A, Hokfelt T, eds), p 436. Amsterdam: Elsevier.

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Authors
Johnson, S., & North, R.
Affiliations
Oregon Health & Science University (US)
Venue
The Journal of Neuroscience
Published
1992-02-01
Volume
12
Issue
2
Pages
483-488
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2169863475
Cited by
1,637
References
40
Citations by year
2026: 37 · 2025: 47 · 2024: 48 · 2023: 47 · 2022: 55 · 2021: 54 · 2020: 62 · 2019: 60 · 2018: 61 · 2017: 51 · 2016: 76 · 2015: 55 · 2014: 71 · 2013: 54 · 2012: 77
FWCI
9.65
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Health and Human Services
  • National Institutes of Health (5r01mh040416-17, 5k08ns001423-05, 5r01da003161-12)
  • National Institute of Mental Health (MH 40416)
  • National Institute on Drug Abuse (DA03161)
  • National Institute of Neurological Disorders and Stroke (NS01423)
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
opioids, dopaminergic neurons, ventral tegmental area, local interneurons, GABAergic interneurons, mu-opioid receptor, disinhibition, synaptic inhibition, opioid reinforcement, morphine, heroin
MeSH terms
Analgesics, Opioid, Animals, Bicuculline, Dopamine, Enkephalin, Methionine, Enkephalins, Evoked Potentials, gamma-Aminobutyric Acid, Interneurons, Male, Membrane Potentials, Mesencephalon, Neurons, Pyrrolidines, Rats, Inbred Strains, Receptors, GABA-A, Synapses, 3,4-Dichloro-N-methyl-N-(2-(1-pyrrolidinyl)-cyclohexyl)-benzeneacetamide, (trans)-Isomer, Enkephalin, Ala(2)-MePhe(4)-Gly(5)-, Enkephalin, D-Penicillamine (2,5)-, Rats, In Vitro Techniques

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