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Effects of Swim Stress and Fluoxetine on 5-HT1A Receptor Gene Expression and Monoamine Metabolism in the Rat Brain Regions

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Abstract

Changes in gene expression of the brain serotonin (5-HT) 1A receptors may be important for the development and ameliorating depression, however identification of specific stimuli that activate or reduce the receptor transcriptional activity is far from complete. In the present study, the forced swim test (FST) exposure, the first stress session of which is already sufficient to induce behavioral despair in rats, significantly increased 5-HT1A receptor mRNA levels in the brainstem, frontal cortex, and hippocampus at 24 h. In the brainstem and frontal cortex, the elevation in the receptor gene expression after the second forced swim session was not affected following chronic administration of fluoxetine, while in the cortex, both control and FST values were significantly reduced in fluoxetine-treated rats. In contrast to untreated rats, no increase in hippocampal 5-HT1A receptor mRNA was observed in response to FST in rats chronically treated with fluoxetine. Metabolism of 5-HT (5-HIAA/5-HT) in the brainstem was significantly decreased by fluoxetine and further reduced by swim stress, showing a certain degree of independence of these changes on 5-HT1A receptor gene expression that was increased in this brain region only after the FST, but not after fluoxetine. FST exposure also decreased the brainstem dopamine metabolism, which was unexpectedly positively correlated with 5-HT1A receptor mRNA levels in the frontal cortex. Together, these data suggest that the effects of the forced swim stress as well as fluoxetine involve brain region-dependent alterations in 5-HT1A receptor gene transcription, some of which may be interrelated with concomitant changes in catecholamine metabolism.

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Acknowledgments

This study was supported by RFBR grants N 09-04-00284 and N 12-04-01102.

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  1. Functional Neurogenomics Laboratory, Institute of Cytology and Genetics, Russian Academy of Science, Novosibirsk, Russia, 630090

    G. T. Shishkina, T. S. Kalinina & N. N. Dygalo

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  1. G. T. Shishkina
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  2. T. S. Kalinina
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Correspondence to G. T. Shishkina.

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Shishkina, G.T., Kalinina, T.S. & Dygalo, N.N. Effects of Swim Stress and Fluoxetine on 5-HT1A Receptor Gene Expression and Monoamine Metabolism in the Rat Brain Regions. Cell Mol Neurobiol 32, 787–794 (2012). https://doi.org/10.1007/s10571-012-9828-0

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