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Open Access 01-09-2021 | Antidepressant Drugs | Original Article

Sudden cessation of fluoxetine before alcohol drinking reinstatement alters microglial morphology and TLR4/inflammatory neuroadaptation in the rat brain

Authors: Jesús Aranda, María del Mar Fernández-Arjona, Francisco Alén, Patricia Rivera, Leticia Rubio, Inés Smith-Fernández, Francisco Javier Pavón, Antonia Serrano, Pedro J. Serrano-Castro, Fernando Rodríguez de Fonseca, Juan Suárez

Published in: Brain Structure and Function | Issue 7/2021

Abstract

Preclinical studies on the effects of abrupt cessation of selective serotonin reuptake inhibitors (SSRIs), a medication often prescribed in alcohol use disorder (AUD) patients with depression, results in alcohol consumption escalation after resuming drinking. However, a potential neuroinflammatory component on this escalation remains unexplored despite the immunomodulatory role of serotonin. Here, we utilized a rat model of 14-daily administration of the SSRI fluoxetine (10 mg/kg/day) along alcohol self-administration deprivation to study the effects of fluoxetine cessation on neuroinflammation after resuming alcohol drinking. Microglial morphology and inflammatory gene expression were analyzed in prelimbic cortex, striatum, basolateral amygdala and dorsal hippocampus. Results indicated that alcohol drinking reinstatement increased microglial IBA1 immunoreactivity and altered morphometric features of activated microglia (fractal dimension, lacunarity, density, roughness, and cell area, perimeter and circularity). Despite alcohol reinstatement, fluoxetine cessation modified microglial morphology in a brain region-specific manner, resulting in hyper-ramified (spatial complexity of branching), reactive (lower heterogeneity and circularity)-like microglia. We also found that microglial cell area correlated with changes in mRNA expression of chemokines (Cx3cl1/fractalkine, Cxcl12/SDF1α, Ccl2/MCP1), cytokines (IL1β, IL6, IL10) and the innate immune toll-like receptor 4 (TLR4) in dorsal hippocampus. Specifically, TLR4 correlated with microglial spatial complexity assessed by fractal dimension in striatum, suggesting a role in process branching. These findings suggest that alcohol drinking reinstatement after fluoxetine treatment cessation disturbs microglial morphology and reactive phenotype associated with a TLR4/inflammatory response to alcohol in a brain region-specific manner, facts that might contribute to alcohol-induced damage through the promotion of escalation of alcohol drinking behavior.

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Title: Sudden cessation of fluoxetine before alcohol drinking reinstatement alters microglial morphology and TLR4/inflammatory neuroadaptation in the rat brain
Authors: Jesús Aranda
María del Mar Fernández-Arjona
Francisco Alén
Patricia Rivera
Leticia Rubio
Inés Smith-Fernández
Francisco Javier Pavón
Antonia Serrano
Pedro J. Serrano-Castro
Fernando Rodríguez de Fonseca
Juan Suárez
Publication date: 01-09-2021
Publisher: Springer Berlin Heidelberg
Keywords: Antidepressant Drugs
Antidepressant Drugs
Fluoxetine
Published in: Brain Structure and Function / Issue 7/2021
Print ISSN: 1863-2653
Electronic ISSN: 1863-2661
DOI: https://doi.org/10.1007/s00429-021-02321-9

Keynote webinar | Spotlight on sleep in brain health

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Sudden cessation of fluoxetine before alcohol drinking reinstatement alters microglial morphology and TLR4/inflammatory neuroadaptation in the rat brain

Abstract

Keynote webinar | Spotlight on sleep in brain health

Springer Medicine

Abstract

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