Abstract
There is ample experimental evidence supporting the hypothesis that the brain serotonergic system is involved in the control of chronic social defeat stress (CSDS), depression, and anxiety. The study aimed to analyze mRNA levels of the serotonergic genes in the raphe nuclei of midbrain that may be associated with chronic social defeats consistently shown by male mice in special experimental settings. The serotonergic genes were the Tph2, Sert, Maoa, and Htr1a. The Bdnf and Creb genes were also studied. The experimental groups were composed of male mice with experience of defeats in 21 daily encounters and male mice with the same track record of defeats followed by a no-defeat period without agonistic interactions (relative rest for 14 days). It has been shown that mRNA levels of the Tph2, Maoa, Sert, Htr1a, Bdnf, and Creb genes in the raphe nuclei of defeated mice are decreased as compared with the controls. The expression of the serotonergic genes as well as the Creb gene is not restored to the control level after the 2 weeks of relative rest. mRNA levels of Bdnf gene are not recovered to the control levels, although some upregulation was observed in rested losers. CSDS experience inducing the development of mixed anxiety/depression-like state in male mice downregulates the expression of serotonergic genes associated with the synthesis, inactivation, and reception of serotonin. The Bdnf and Creb genes in the midbrain raphe nuclei are also downregulated under CSDS. Period of relative rest is not enough for most serotonergic genes to recover expression to the control levels.
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This work was supported partly by Research Program from the Russian Academy of Sciences “Molecular and Cellular Biology” grant А.II.6.16 and “Russian Foundation for Basic Research” grant 10-04-00083-а.
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Boyarskikh, U.A., Bondar, N.P., Filipenko, M.L. et al. Downregulation of Serotonergic Gene Expression in the Raphe Nuclei of the Midbrain Under Chronic Social Defeat Stress in Male Mice. Mol Neurobiol 48, 13–21 (2013). https://doi.org/10.1007/s12035-013-8413-y
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DOI: https://doi.org/10.1007/s12035-013-8413-y