Cited by 131Neurotransmitter Receptor Influence on BehaviorStress Responses and CortisolNeuroscience and Neuropharmacology Research

Different stressors produce excitation or inhibition of mesolimbic dopamine neuron activity: response alteration by stress pre‐exposure

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Valenti, Ornella, Gill, Kathryn M., Grace, Anthony A.·2012·European Journal of Neuroscience

Abstract

Stressors can exert a wide variety of responses, ranging from adaptive responses to pathological changes; moreover, recent studies suggest that mild stressors can attenuate the response of a system to major stressful events. We have previously shown that 2‐week exposure to cold, a comparatively mild inescapable stressor, induced a pronounced reduction in ventral tegmental area (VTA) dopamine (DA) neuron activity, whereas restraint stress increases DA neuron activity. However, it is not known if these stressors differentially impact the VTA in a region‐specific manner, if they differentially impact behavioral responses, or whether the effects of such different stressors are additive or antagonistic with regard to their impact on DA neuron firing. To address these questions, single‐unit extracellular recordings were performed in anesthetized control rats and rats exposed to chronic cold, and tested after delivery of a 2‐h restraint session. Chronic cold stress strongly attenuated the number of DA neurons firing in the VTA, and this effect occurred primarily in the medial and central VTA regions that preferentially project to reward‐related ventral striatal regions. Chronic cold exposure also prevented the pronounced increase in DA neuron population activity without affecting the behavioral sensitization to amphetamine produced by restraint stress. Taken together, these data show that a prolonged inescapable mild stressor can induce plastic changes that attenuate the DA system response to acute stress.

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Crossref · 10.1111/j.1460-9568.2012.08038.x

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  1. Willner P Bloom FE Kupfer DJ 1995 Dopamine mechanisms in depression and mania Psychopharmacology: The Fourth Generation of Progress Raven Press New York 921 932

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Authors
Valenti, O., Gill, K. M., & Grace, A. A.
Affiliations
University of Pittsburgh (US)
Venue
European Journal of Neuroscience
Publisher
Wiley
Published
2012-04
Volume
35
Issue
8
Pages
1312-1321
ISSN
  • 0953-816X (ISSN-L)
  • 1460-9568
OpenAlex
W2104293622
Cited by
131
References
83
Citations by year
2026: 5 · 2025: 7 · 2024: 4 · 2023: 7 · 2022: 6 · 2021: 12 · 2020: 11 · 2019: 11 · 2018: 14 · 2017: 13 · 2016: 12 · 2015: 8 · 2014: 4 · 2013: 12 · 2012: 4
FWCI
3.69
Type
journal article
Language
en
Open access
Locations
  • European Journal of Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute of Mental Health (R37MH057440)
  • National Institute on Drug Abuse (DA 15408, R56DA015408, R01DA015408)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
mesolimbic dopamine system, ventral tegmental area, chronic cold stress, restraint stress, stress adaptation, amphetamine sensitization, ventral striatum, single-unit recording, stressor specificity
MeSH terms
Action Potentials, Afferent Pathways, Amphetamine, Analysis of Variance, Animals, Cold Temperature, Disease Models, Animal, Male, Motor Activity, Neural Inhibition, Restraint, Physical, Stress, Psychological, Time Factors, Dopamine Agents, Rats, Sprague-Dawley, Prefrontal Cortex, Ventral Tegmental Area, Rats, Dopaminergic Neurons

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