Abstract
Rationale
Glibenclamide (GD) is a widely used medical drug; therefore, identifying the mechanisms underlying its pleiotropic effects in the central nervous system is urgent.
Objectives
The aim of this work was to determine the ability of GD to modulate serotonin (5-hydroxytryptamine, 5-HT) and dopamine (DA) transmission and to assess the dose-dependent effect of GD on cognitive function in rats during natural ageing.
Methods
In Experiment 1, rats received 10, 25, or 50 μg/kg GD intraperitoneally for 10 days. In Experiment 2, rats received 50 μg/kg GD intraperitoneally for 30 days. Spatial and working memory was assessed in the MWM and Y-maze tests, respectively. In both experiments, the levels of DA and 5-HT, their metabolites, and turnover rate were analysed by HPLC-ED in the rat hippocampus and striatum.
Results
Changes in DA and 5-HT levels occurred only with a dose of 50 μg/kg GD. Therefore, in the second experiment, we administered a dose of 50 μg/kg GD. At this dose, GD prevented the development of impairments in spatial and working memory. The hippocampal concentrations of DA and DOPAC decreased, and the striatal concentrations of DA, DOPAC, 5-HT, and 5-HIAA increased.
Conclusion
One of the possible mechanisms of the precognitive effect of GD is its ability to modulate monoamine transmission. Thus, in translating our results to humans, GD can be recommended as a prophylactic agent for natural ageing to reduce the risk of developing cognitive impairments.
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Data availability
The data that support the findings of this study are available from the corresponding author, D. S. Traktirov, upon reasonable request.
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This work was supported by the Russian Foundation for Basic Research under Grant 20–015-00168.
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Zubov, A., Ivleva, I., Pestereva, N. et al. Glibenclamide alters serotonin and dopamine levels in the rat striatum and hippocampus, reducing cognitive impairment. Psychopharmacology 239, 2787–2798 (2022). https://doi.org/10.1007/s00213-022-06159-9
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DOI: https://doi.org/10.1007/s00213-022-06159-9