Cited by 258Connexins and lens biologyTreatment of Major DepressionNeuroscience and Neuropharmacology Research

Gap Junction Dysfunction in the Prefrontal Cortex Induces Depressive-Like Behaviors in Rats

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Sun, Jian-Dong, Liu, Yan, Yuan, Yu-He, Li, Jing, Chen, Nai-Hong·2012·Neuropsychopharmacology

Abstract

Growing evidence has implicated glial anomalies in the pathophysiology of major depression disorder (MDD). Gap junctional communication is a main determinant of astrocytic function. However, it is unclear whether gap junction dysfunction is involved in MDD development. This study investigates changes in the function of astrocyte gap junction occurring in the rat prefrontal cortex (PFC) after chronic unpredictable stress (CUS), a rodent model of depression. Animals exposed to CUS and showing behavioral deficits in sucrose preference test (SPT) and novelty suppressed feeding test (NSFT) exhibited significant decreases in diffusion of gap junction channel-permeable dye and expression of connexin 43 (Cx43), a major component of astrocyte gap junction, and abnormal gap junctional ultrastructure in the PFC. Furthermore, we analyzed the effects of typical antidepressants fluoxetine and duloxetine and glucocorticoid receptor (GR) antagonist mifepristone on CUS-induced gap junctional dysfunction and depressive-like behaviors. The cellular and behavioral alterations induced by CUS were reversed and/or blocked by treatment with typical antidepressants or mifepristone, indicating that the mechanism of their antidepressant action may involve the amelioration of gap junction dysfunction and the cellular changes may be related to GR activation. We then investigated the effects of pharmacological gap junction blockade in the PFC on depressive-like behaviors. The results demonstrate that carbenoxolone (CBX) infusions induced anhedonia in SPT, and anxiety in NSFT, and Cx43 mimetic peptides Gap27 and Gap26 also induced anhedonia, a core symptom of depression. Together, this study supports the hypothesis that gap junction dysfunction contributes to the pathophysiology of depression.

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  • Chronic treatment with duloxetine increases the expression of connexin 43 in the rat prefrontal cortex, preventing chronic unpredictable stress-induced dysfunction of astrocyte gap junctions and reversing depressive-like behaviors caused by gap junction inhibition.

    “Chronic treatment with DXT increases the expression of connexin 43 (Cx43), a crucial component of astrocyte gap junctions, in the rat PFC, preventing chronic unpredictable stress-induced dysfunction of astrocyte gap junctions and reversing the depressive-like behaviors caused by gap junction inhibition. 71”

    From Major depressive disorder: hypothesis, mechanism, prevention and treatment (2024) · cites this paper as [71]

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  • Chronic treatment with fluoxetine increases the expression of Cx43 in the rat PFC, prevents dysfunction of astrocytic gap junctions induced by CUS, and reverses depressive-like behaviors caused by gap junction blockade.

    “Chronic treatment with fluoxetine has been shown to increase the expression of Cx43 in the rat PFC, which further prevents the dysfunction of astrocytic gap junctions induced by CUS and reverses the depressive-like behaviors caused by gap junction blockade. 71”

    From Major depressive disorder: hypothesis, mechanism, prevention and treatment (2024) · cites this paper as [71]

    The Discussion reports that chronic fluoxetine increased Cx43 protein in the rat PFC and prevented or reversed CUS-induced astrocytic gap-junction dysfunction. It separately reports that gap-junction blockade induced depressive-like behaviors, but does not say fluoxetine reversed behaviors caused by that blockade. Page numbers are unavailable in our copy. (LLM, conf=0.89)

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Authors
Sun, J.-D., Liu, Y., Yuan, Y.-H., Li, J., & Chen, N.-H.
Affiliations
Chinese Academy of Medical Sciences & Peking Union Medical College (CN)
Corresponding author
Chen, Nai-Hong
Venue
Neuropsychopharmacology
Published
2011-12-21
Volume
37
Issue
5
Pages
1305-1320
ISSN
  • 0893-133X (ISSN-L)
  • 1740-634X
OpenAlex
W2060938551
Cited by
258
References
68
Citations by year
2026: 10 · 2025: 25 · 2024: 20 · 2023: 27 · 2022: 20 · 2021: 25 · 2020: 18 · 2019: 23 · 2018: 12 · 2017: 15 · 2016: 16 · 2015: 20 · 2014: 12 · 2013: 10 · 2012: 5
FWCI
3.50
Type
journal article
Language
en
Open access
Locations
  • Neuropsychopharmacology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Academy of Medical Sciences
  • National Natural Science Foundation of China (81073078, 30973887, 2012ZX09301002-004, U832008)
  • Chinese Academy of Sciences
  • Chinese Academy of Medical Sciences
  • Peking Union Medical College
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Connexins and lens biology
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
astrocytes, prefrontal cortex, major depressive disorder, chronic unpredictable mild stress, connexin 43, glucocorticoid receptor, mifepristone, fluoxetine, duloxetine, carbenoxolone, Gap27, anhedonia, anxiety, antidepressant mechanism, glial dysfunction
MeSH terms
Duloxetine Hydrochloride, Analysis of Variance, Animals, Carbenoxolone, Disease Models, Animal, Electroshock, Exploratory Behavior, Fluoxetine, Food Deprivation, Food Preferences, Gene Expression Regulation, Glial Fibrillary Acidic Protein, Hormone Antagonists, Inhibition, Psychological, Isoquinolines, Male, Restraint, Physical, RNA, Messenger, Social Isolation, Stress, Psychological, Sucrose, Sweetening Agents, Swimming, Thiophenes, Mifepristone, Rats, Sprague-Dawley, Selective Serotonin Reuptake Inhibitors, Prefrontal Cortex, Gap Junctions, Connexin 43, Microscopy, Electron, Transmission, Rats

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