Cited by 140Neurotransmitter Receptor Influence on BehaviorNeuroscience and Neuropharmacology ResearchMemory and Neural Mechanisms

Drugs of abuse and stress impair LTP at inhibitory synapses in the ventral tegmental area

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Niehaus, Jason L., Murali, Manjari, Kauer, Julie A.·2010·European Journal of Neuroscience

Abstract

Synaptic plasticity in the ventral tegmental area (VTA) is modulated by drugs of abuse and stress and is hypothesized to contribute to specific aspects of addiction. Both excitatory and inhibitory synapses on dopamine neurons in the VTA are capable of undergoing long‐term changes in synaptic strength. While the strengthening or weakening of excitatory synapses in the VTA has been widely examined, the role of inhibitory synaptic plasticity in brain reward circuitry is less established. Here, we investigated the effects of drugs of abuse, as well as acute stress, on long‐term potentiation of GABAergic synapses onto VTA dopamine neurons (LTP GABA). Morphine (10 mg/kg i.p.) reduced the ability of inhibitory synapses in midbrain slices to express LTP GABA both at 2 and 24 h after drug exposure but not after 5 days. Cocaine (15 mg/kg i.p.) impaired LTP GABA 24 h after exposure, but not at 2 h. Nicotine (0.5 mg/kg i.p.) impaired LTP GABA 2 h after exposure, but not after 24 h. Furthermore, LTP GABA was completely blocked 24 h following brief exposure to a stressful stimulus, a forced swim task. Our data suggest that drugs of abuse and stress trigger a common modification to inhibitory plasticity, synergizing with their collective effect at excitatory synapses. Together, the net effect of addictive substances or stress is expected to increase excitability of VTA dopamine neurons, potentially contributing to the early stages of addiction.

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Crossref · 10.1111/j.1460-9568.2010.07256.x

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  • Exposure to a single acute stressor can promote long-lasting neuroplastic changes in VTA dopamine neurons in a manner similar to exposure to recreational drugs.

    “Exposure to a single acute stressor can also promote long-lasting neuroplastic changes in VTA dopamine neurons in a manner similar to exposure to recreational drugs (Dong et al., 2004; Graziane et al., 2013; Niehaus et al., 2010; Saal et al., 2003).”

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  1. Malenka RC Bear MF LTP and LTD: an embarrassment of riches Neuron 2004 44 5 21 15450156

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Authors
Niehaus, J. L., Murali, M., & Kauer, J. A.
Affiliations
Brown University (US)
Corresponding author
Kauer, Julie A.
Venue
European Journal of Neuroscience
Publisher
Wiley
Published
2010-07
Volume
32
Issue
1
Pages
108-117
ISSN
  • 0953-816X (ISSN-L)
  • 1460-9568
OpenAlex
W2164154357
Cited by
140
References
53
Citations by year
2026: 5 · 2025: 5 · 2024: 5 · 2023: 6 · 2022: 9 · 2021: 6 · 2020: 14 · 2019: 5 · 2018: 8 · 2017: 12 · 2016: 4 · 2015: 14 · 2014: 12 · 2013: 8 · 2012: 8
FWCI
4.53
Type
journal article
Language
en
Open access
Locations
  • European Journal of Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • Brown University
  • National Institutes of Health
  • National Institute on Drug Abuse (F32DA024527, DA011289, R01DA011289, DA024527)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
drugs of abuse, acute stress, long-term potentiation, inhibitory synapses, ventral tegmental area, dopaminergic neurons, GABAergic synapses, synaptic plasticity, morphine, cocaine, nicotine, addiction, brain reward system
MeSH terms
Analgesics, Opioid, Animals, Cocaine, Dopamine, gamma-Aminobutyric Acid, Morphine, Neurons, Nicotine, Receptors, Glucocorticoid, Illicit Drugs, Stress, Physiological, Synapses, Rats, Sprague-Dawley, Ventral Tegmental Area, Long-Term Potentiation, Patch-Clamp Techniques, Nicotinic Agonists, Dopamine Uptake Inhibitors, Rats

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