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Effects of Dextromethorphan on Depressive-and Cognitive-Associated Behaviors: A Sexually Dimorphic Study
Omamuyovwi Meashack Ijomone1,2, Ifechukwude Joachim Biose2
1Department of Anatomical Sciences, School of Health and Health Technology, Federal University of Technology Akure, Nigeria.
Introduction:
We investigated the sexually dimorphic effects of Dextromethorphan (DM) on cognitive and depression-like behaviors as well as on hippocampal histology in rats following acute administration.
Methods:
Wistar rats of both sexes were treated with 25 or 50 mg/kg of DM for 7 days via intraperitoneal injection. At the end of the administration, behavioral studies were performed on the Tail Suspension Test (TST) for depressive-like behaviors and the Y-maze for cognitive behaviors. The rats' brains were excised and processed for routine histological analysis.
Results:
Our results showed that DM significantly increased (P<0.05) immobility time in the TST in male rats but not female ones, and decreased percentage alternation (P<0.001) on the Y-maze in both male and female rats. Histological analysis revealed no morphological changes in the hippocampus following DM treatment.
Conclusion:
DM impairs cognitive functions in both male and female rats without histologic defects in the hippocampus. However, the induced depressive-like behaviors following DM administration may be sexually dependent.
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