Abstract
We examined the interaction between the selective serotonin reuptake inhibitor, fluoxetine, and group-II metabotropic glutamate (mGlu) receptors using progenitor cells isolated from cultured cerebellar granule cells, considered as an in vitro model of antidepressant-drug induced neurogenesis. These cells expressed mGlu3 receptors negatively coupled to adenylyl cyclase. A 72-h treatment with either fluoxetine or low concentrations of mGlu2/3 receptor agonists (LY379268 or 2R,4R-APDC) enhanced cell proliferation. The action of fluoxetine was mediated by the activation of 5-HT1A receptors. We found a strong synergism between fluoxetine and LY379268 in enhancing cell proliferation and inhibiting cAMP formation. The increased cell proliferation induced by fluoxetine + LY379268 was abrogated by the cAMP analogue, 8-Br-cAMP, as well as by drugs that inhibit the mitogen-activated protein kinase and phosphatidyilinositol-3-kinase pathways. Interestingly, fluoxetine and LY379268 also acted synergistically in promoting neuronal differentiation when progenitor cells were incubated in the presence of serum. These data support the hypothesis that a combination between classical antidepressants and mGlu2/3 receptor agonists may be helpful in the experimental treatment of depression.
Original language | English (US) |
---|---|
Pages (from-to) | 428-437 |
Number of pages | 10 |
Journal | Neuropharmacology |
Volume | 54 |
Issue number | 2 |
DOIs | |
State | Published - Feb 1 2008 |
Keywords
- Cell proliferation
- Cerebellar progenitors
- Fluoxetine
- Neurogenesis
- mGlu3 receptors
ASJC Scopus subject areas
- Pharmacology
- Cellular and Molecular Neuroscience