Contribution of the Opioid System to the Antidepressant Effects of Fluoxetine.
Dentate gyrus
Depression
Enkephalin
Fluoxetine
Opioid
Selective serotonin reuptake inhibitors (SSRI)
Journal
Biological psychiatry
ISSN: 1873-2402
Titre abrégé: Biol Psychiatry
Pays: United States
ID NLM: 0213264
Informations de publication
Date de publication:
15 12 2022
15 12 2022
Historique:
received:
16
12
2020
revised:
17
05
2022
accepted:
18
05
2022
pubmed:
18
8
2022
medline:
22
11
2022
entrez:
17
8
2022
Statut:
ppublish
Résumé
Selective serotonin reuptake inhibitors such as fluoxetine have a limited treatment efficacy. The mechanism by which some patients respond to fluoxetine while others do not remains poorly understood, limiting treatment effectiveness. We have found the opioid system to be involved in the responsiveness to fluoxetine treatment in a mouse model for anxiety- and depressive-like behavior. We analyzed gene expression changes in the dentate gyrus of mice chronically treated with corticosterone and fluoxetine. After identifying a subset of genes of interest, we studied their expression patterns in relation to treatment responsiveness. We further characterized their expression through in situ hybridization and the analysis of a single-cell RNA sequencing dataset. Finally, we behaviorally tested mu and delta opioid receptor knockout mice in the novelty suppressed feeding test and the forced swim test after chronic corticosterone and fluoxetine treatment. Chronic fluoxetine treatment upregulates proenkephalin expression in the dentate gyrus, and this upregulation is associated with treatment responsiveness. The expression of several of the most significantly upregulated genes, including proenkephalin, is localized to an anatomically and transcriptionally specialized subgroup of mature granule cells in the dentate gyrus. We have also found that the delta opioid receptor contributes to some, but not all, of the behavioral effects of fluoxetine. These data indicate that the opioid system is involved in the antidepressant effects of fluoxetine, and this effect may be mediated through the upregulation of proenkephalin in a subpopulation of mature granule cells.
Sections du résumé
BACKGROUND
Selective serotonin reuptake inhibitors such as fluoxetine have a limited treatment efficacy. The mechanism by which some patients respond to fluoxetine while others do not remains poorly understood, limiting treatment effectiveness. We have found the opioid system to be involved in the responsiveness to fluoxetine treatment in a mouse model for anxiety- and depressive-like behavior.
METHODS
We analyzed gene expression changes in the dentate gyrus of mice chronically treated with corticosterone and fluoxetine. After identifying a subset of genes of interest, we studied their expression patterns in relation to treatment responsiveness. We further characterized their expression through in situ hybridization and the analysis of a single-cell RNA sequencing dataset. Finally, we behaviorally tested mu and delta opioid receptor knockout mice in the novelty suppressed feeding test and the forced swim test after chronic corticosterone and fluoxetine treatment.
RESULTS
Chronic fluoxetine treatment upregulates proenkephalin expression in the dentate gyrus, and this upregulation is associated with treatment responsiveness. The expression of several of the most significantly upregulated genes, including proenkephalin, is localized to an anatomically and transcriptionally specialized subgroup of mature granule cells in the dentate gyrus. We have also found that the delta opioid receptor contributes to some, but not all, of the behavioral effects of fluoxetine.
CONCLUSIONS
These data indicate that the opioid system is involved in the antidepressant effects of fluoxetine, and this effect may be mediated through the upregulation of proenkephalin in a subpopulation of mature granule cells.
Identifiants
pubmed: 35977861
pii: S0006-3223(22)01323-3
doi: 10.1016/j.biopsych.2022.05.030
pmc: PMC10426813
mid: NIHMS1907475
pii:
doi:
Substances chimiques
Fluoxetine
01K63SUP8D
Analgesics, Opioid
0
Corticosterone
W980KJ009P
Receptors, Opioid, delta
0
Antidepressive Agents
0
Serotonin Uptake Inhibitors
0
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Langues
eng
Sous-ensembles de citation
IM
Pagination
952-963Subventions
Organisme : NIDA NIH HHS
ID : U01 DA043098
Pays : United States
Organisme : HSRD VA
ID : CDP 13-003
Pays : United States
Organisme : NHLBI NIH HHS
ID : R21 HL083862
Pays : United States
Organisme : NIA NIH HHS
ID : R01 AG043688
Pays : United States
Organisme : NINDS NIH HHS
ID : R01 NS081203
Pays : United States
Organisme : NIMH NIH HHS
ID : R37 MH068542
Pays : United States
Organisme : NIMH NIH HHS
ID : R21 MH116462
Pays : United States
Organisme : NIMH NIH HHS
ID : R01 MH083862
Pays : United States
Commentaires et corrections
Type : CommentIn
Informations de copyright
Copyright © 2022 Society of Biological Psychiatry. Published by Elsevier Inc. All rights reserved.
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