Cited by 104Neurotransmitter Receptor Influence on BehaviorStress Responses and CortisolTreatment of Major Depression

Dopamine Receptor D2 and Associated microRNAs Are Involved in Stress Susceptibility and Resistance to Escitalopram Treatment

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Zhang, Y., Wang, Y., Wang, L., Bai, M., Zhang, X., Zhu, X.·2015·International Journal of Neuropsychopharmacology

Abstract

BACKGROUND: Early life stress has been demonstrated to increase the risk of developing depression in adulthood. However, the roles and associated molecular mechanisms of stresses in the onset and relapse of depression have yet to be fully elucidated. METHODS: Depression-like behaviors were induced in rats by maternal deprivation and chronic unpredictable stress. Depression- and anxiety-like behaviors of rats, dopamine receptor D2 level, and microRNAs expression in rats' brain tissues were measured. RESULTS: Chronic unpredictable stress alone induced depression-like behaviors in rats, but maternal deprivation enhanced the effect of chronic unpredictable stress. Escitalopram significantly decreased depression-like behaviors in chronic unpredictable stress rats but was less effective in maternal deprivation with chronic unpredictable stress rats. Maternal deprivation increased dopamine receptor D2 messenger RNA expression and decreased microRNA-9 expression in the striatum. Chronic unpredictable stress increased dopamine receptor D2 mRNA and protein levels and decreased microRNA-9 expression in the nucleus accumbens. Furthermore, maternal deprivation enhanced the effect of chronic unpredictable stress on dopamine receptor D2 gene and microRNA-9 expression. Chronic unpredictable stress increased the expression of microRNA-326 in the nucleus accumbens but decreased it in the striatum, whereas maternal deprivation elevated microRNA-326 expression in the striatum. Escitalopram normalized microRNA-326 expression but had no effect on the expression of microRNA-9, dopamine receptor D2 mRNA, and dopamine receptor D2 protein in both the nucleus accumbens and striatum. The in vitro study showed that only microRNA-9 directly targeted the 3' untranslated region of dopamine receptor D2 mRNA and inhibited dopamine receptor D2 protein expression. CONCLUSION: Early life stress enhanced the susceptibility to late life stress and resistance to escitalopram treatment through decreasing microRNA-9 expression and subsequently upregulating dopamine receptor D2 expression in the nucleus accumbens. microRNA-326 may be a novel target of escitalopram.

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Authors
Zhang, Y., Wang, Y., Wang, L., Bai, M., Zhang, X., & Zhu, X.
Affiliations
University of Maryland, Baltimore (US)
Corresponding author
Zhu, X.
Venue
International Journal of Neuropsychopharmacology
Published
2015-03-03
Volume
18
Issue
8
Pages
pyv025-pyv025
ISSN
  • 1461-1457 (ISSN-L)
  • 1469-5111
OpenAlex
W2095128214
Cited by
104
References
29
Citations by year
2026: 5 · 2025: 5 · 2024: 11 · 2023: 17 · 2022: 12 · 2021: 14 · 2020: 5 · 2019: 11 · 2018: 6 · 2017: 10 · 2016: 7 · 2015: 1
FWCI
3.71
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
  • The International Journal of Neuropsychopharmacology (publishedVersion, cc-by-nc)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • National Natural Science Foundation of China (81071097)
  • Hunan Provincial Innovation Foundation for Postgraduate
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
Keywords
dopamine D2 receptor, miR-9, early life stress, maternal deprivation, chronic unpredictable mild stress, depression, escitalopram, antidepressant resistance, nucleus accumbens, striatum, 3' untranslated region, microRNA target regulation, depression-like behavior, anxiety-like behavior
MeSH terms
Animals, Chronic Disease, Corpus Striatum, Depressive Disorder, Disease Models, Animal, Drug Resistance, Male, Maternal Deprivation, Nucleus Accumbens, Random Allocation, RNA, Messenger, Stress, Psychological, Citalopram, Rats, Sprague-Dawley, Receptors, Dopamine D2, Antidepressive Agents, Second-Generation, Uncertainty, MicroRNAs, Depressive Disorder, Treatment-Resistant

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