Cited by 27Stress Responses and CortisolNeuropeptides and Animal PhysiologyTreatment of Major Depression

Effects of fluoxetine on CRF and CRF1 expression in rats exposed to the learned helplessness paradigm

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Fernández Macedo, Georgina Valeria, Cladouchos, María Laura, Sifonios, Laura, Cassanelli, Pablo Martín, Wikinski, Silvia·2013·Psychopharmacology

Abstract

Rationale Stress is a common antecedent reported by people suffering major depression. In these patients, extrahypothalamic brain areas, like the hippocampus and basolateral amygdala (BLA), have been found to be affected. The BLA synthesizes CRF, a mediator of the stress response, and projects to hippocampus. The main hippocampal target for this peptide is the CRF subtype 1 receptor (CRF1). Evidence points to a relationship between dysregulation of CRF/CRF1 extrahypothalamic signaling and depression.Objective Because selective serotonin reuptake inhibitors (SSRIs) are the first-line pharmacological treatment for depression, we investigated the effect of chronic treatment with the SSRI fluoxetine on long-term changes in CRF/CRF1 signaling in animals showing a depressive-like behavior.Methods Male Wistar rats were exposed to the learned helplessness paradigm (LH). After evaluation of behavioral impairment, the animals were treated with fluoxetine (10 mg/kg i.p.) or saline for 21 days. We measured BLA CRF expression with RT-PCR and CRF1 expression in CA3 and the dentate gyrus of the hippocampus with in situ hybridization. We also studied the activation of one of CRF1's major intracellular signaling targets, the extracellular signal-related kinases 1 and 2 (ERK1/2) in CA3.Results In saline-treated LH animals, CRF expression in the BLA increased, while hippocampal CRF1 expression and ERK1/2 activation decreased. Treatment with fluoxetine reversed the changes in CRF and CRF1 expressions, but not in ERK1/2 activation.Conclusion In animals exposed to the learned helplessness paradigm, there are long-term changes in CRF and CRF1 expression that are restored with a behaviorally effective antidepressant treatment.

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  • Antidepressant treatment normalizes expression of CRF and CRF1 receptors in association with remission of depression.

    “Interestingly, antidepressant treatment normalizes expression of CRF and CRF 1 receptors in association with remission of depression [329,344,346].”
  • CRF1 overexpression results in anxiogenic- and depressive-like profile in rodents and humans.

    “CRF 1 overexpression results in an anxiogenic-and depressive-like profile in rodents and humans [342][343][344][345][346].”

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Authors
Fernández Macedo, G. V., Cladouchos, M. L., Sifonios, L., Cassanelli, P. M., & Wikinski, S.
Affiliations
Consejo Nacional de Investigaciones Científicas y Técnicas (AR)
Venue
Psychopharmacology
Published
2012-09-08
Volume
225
Issue
3
Pages
647-659
ISSN
  • 0033-3158 (ISSN-L)
  • 1432-2072
OpenAlex
W2012909047
Cited by
27
References
120
Citations by year
2026: 1 · 2024: 1 · 2022: 2 · 2021: 5 · 2020: 1 · 2019: 4 · 2018: 1 · 2017: 4 · 2016: 2 · 2015: 2 · 2014: 2 · 2013: 2
FWCI
0.80
Type
journal article
Language
en
Open access
Licence
Locations
  • Psychopharmacology (publishedVersion)
  • PubMed (publishedVersion)
  • Conicet (publishedVersion, cc-by-nc-sa)
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
Keywords
fluoxetine, corticotropin-releasing factor, CRF1 receptor, learned helplessness, depression, selective serotonin reuptake inhibitors, basolateral amygdala, hippocampus, ERK signaling, antidepressant treatment, stress response
MeSH terms
CRF Receptor, Type 1, Amygdala, Animals, Behavior, Animal, Corticotropin-Releasing Hormone, Depression, Fluorescent Antibody Technique, Fluoxetine, Helplessness, Learned, Hippocampus, Male, Rats, Wistar, Selective Serotonin Reuptake Inhibitors, In Situ Hybridization, Receptors, Corticotropin-Releasing Hormone, Rats, Real-Time Polymerase Chain Reaction

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