Cited by 286Neuroscience and Neuropharmacology ResearchNeurotransmitter Receptor Influence on BehaviorNeuropeptides and Animal Physiology

Increased probability of GABA release during withdrawal from morphine

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Bonci, Antonello, Williams, John T.·1997·The Journal of Neuroscience

Abstract

Opioid receptors located on interneurons in the ventral tegmental area (VTA) inhibit GABA A -mediated synaptic transmission to dopamine projection neurons. The resulting disinhibition of dopamine cells in the VTA is thought to play a pivotal role in drug abuse; however, little is known about how this GABA A synapse is affected after chronic morphine treatment. The regulation of GABA release during acute withdrawal from morphine was studied in slices from animals treated for 6–7 d with morphine. Slices containing the VTA were prepared and maintained in morphine-free solutions, and GABA A IPSCs were recorded from dopamine cells. The amplitude of evoked IPSCs and the frequency of spontaneous miniature IPSCs measured in slices from morphine-treated guinea pigs were greater than placebo-treated controls. In addition, activation of adenylyl cyclase, with forskolin, and cAMP-dependent protein kinase, with Sp-cAMPS, caused a larger increase in IPSCs in slices from morphine-treated animals. Conversely, the kinase inhibitors staurosporine and Rp-CPT-cAMPS decreased GABA IPSCs to a greater extent after drug treatment. The results indicate that the probability of GABA release was increased during withdrawal from chronic morphine treatment and that this effect resulted from an upregulation of the cAMP-dependent cascade. Increased transmitter release from opioid-sensitive synapses during acute withdrawal may be one adaptive mechanism that results from prolonged morphine treatment.

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Registry

Crossref · 10.1523/jneurosci.17-02-00796.1997

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  • Chronic opioid-induced cAMP-dependent increase in the probability of GABA release in the VTA would inhibit dopamine neurons.

    “A prominent observation is a chronic opioid-induced cAMP-dependent increase in the probability of GABA release in the VTA, which would inhibit dopamine neurons (Bonci and Williams, 1997).”

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Authors
Bonci, A., & Williams, J. T.
Affiliations
Oregon Health & Science University (US)
Venue
The Journal of Neuroscience
Published
1997-01-15
Volume
17
Issue
2
Pages
796-803
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2169322025
Cited by
286
References
45
Citations by year
2026: 4 · 2025: 8 · 2024: 3 · 2023: 12 · 2022: 7 · 2021: 11 · 2020: 6 · 2019: 10 · 2018: 10 · 2017: 9 · 2016: 10 · 2015: 8 · 2014: 15 · 2013: 5 · 2012: 12
FWCI
2.36
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
  • National Institutes of Health
  • National Institute on Drug Abuse (R01DA008163, DA-08163)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
morphine withdrawal, GABA release, ventral tegmental area, dopaminergic neurons, miniature IPSCs, opioid receptors, cAMP signaling, adenylate cyclase, protein kinase A, chronic morphine administration, synaptic plasticity, drug addiction
MeSH terms
Adenylyl Cyclase Inhibitors, Action Potentials, Cyclic AMP, Adenylyl Cyclases, Animals, Dopamine, Enzyme Activation, Enzyme Inhibitors, Colforsin, gamma-Aminobutyric Acid, Guinea Pigs, Interneurons, Morphine, Nerve Tissue Proteins, Organophosphorus Compounds, Picrotoxin, Receptors, GABA-A, Salicylamides, Serotonin, Strychnine, Substance Withdrawal Syndrome, Tegmentum Mesencephali, Thionucleotides, Phorbol 12,13-Dibutyrate, Signal Transduction, 2-Amino-5-phosphonovalerate, Cyclic AMP-Dependent Protein Kinases, Patch-Clamp Techniques, Dopamine Antagonists, Excitatory Amino Acid Antagonists, 6-Cyano-7-nitroquinoxaline-2,3-dione, GABA Antagonists, Staurosporine

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