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Protein kinase Mζ is involved in the modulatory effect of fluoxetine on hippocampal neurogenesis in vitro
- Source :
- The international journal of neuropsychopharmacology. 17(9)
- Publication Year :
- 2014
-
Abstract
- The efficacy of chronic selective serotonin reuptake inhibitors (SSRIs) on depression is paralleled by the recovery of deficits in hippocampal neurogenesis related to sustained stress and elevated glucocorticoids. Previous studies have shown that atypical protein kinase C (aPKC) is implicated in the regulation of neurogenesis and the antidepressant response. Whether the specific aPKC isoforms (PKCζ, PKMζ and PKCι) are involved in SSRI-induced hippocampal neurogenesis and the underlying mechanisms is unknown. The present study shows that PKMζ and PKCι but not PKCζ are expressed in rat embryonic hippocampal neural stem cells (NSCs), whereas PKMζ but not PKCι expression is increased by the SSRI fluoxetine both in the absence and presence of the glucocorticoid receptor agonist dexamethasone. PKMζ shRNA significantly decreased neuronal proliferation and neuron-oriented differentiation, increased NSC apoptosis, and blocked the stimulatory effect of fluoxetine on NSC neurogenesis. Fluoxetine significantly increased PKMζ expression in hippocampal NSCs in a 5-hydroxytryptamine-1A (5-HT1A) receptor-dependent manner in both the absence and presence of dexamethasone. The PKMζ peptide blocker ZIP and MEK inhibitor U0126 significantly inhibited the increase in extracellular signal-regulated kinase 1/2 and cyclic adenosine monophosphate response element binding protein phosphorylation in the mitogen-activated protein kinase (MAPK) pathway and hippocampal NSC neurogenesis in response to fluoxetine and the 5-HT1A receptor agonist 8-OH DPAT. Collectively, our results suggest that the SSRI fluoxetine increases hippocampal NSC neurogenesis via a PKMζ-mediated mechanism that links 5-HT1A receptor activation with the phosphorylation of the downstream MAPK signaling pathway.
- Subjects :
- MAPK/ERK pathway
Serotonin
Pyridines
Neurogenesis
Hippocampal formation
Biology
Pharmacology
Hippocampus
Dexamethasone
Piperazines
Rats, Sprague-Dawley
chemistry.chemical_compound
Glucocorticoid receptor
Neural Stem Cells
Fluoxetine
Animals
Pharmacology (medical)
Cyclic adenosine monophosphate
Enzyme Inhibitors
Protein kinase A
Glucocorticoids
Cells, Cultured
Protein Kinase C
MEK inhibitor
Cell Differentiation
Embryo, Mammalian
Neural stem cell
Rats
Psychiatry and Mental health
nervous system
chemistry
Gene Expression Regulation
Receptor, Serotonin, 5-HT1A
Antidepressive Agents, Second-Generation
Serotonin Antagonists
Signal Transduction
Subjects
Details
- ISSN :
- 14695111
- Volume :
- 17
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- The international journal of neuropsychopharmacology
- Accession number :
- edsair.doi.dedup.....7503e9ac4d767b8b37d82b9b1cae567c