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Tropisetron Attenuated the Anxiogenic Effects of Social Isolation by Modulating Nitrergic System and Mitochondrial Function Publisher Pubmed



Amiri S1, 2 ; Aminikhoei H1, 2 ; Hajmirzaian A1, 2 ; Rahimibalaei M3 ; Naserzadeh P4 ; Dehpour A1, 2 ; Mehr SE1, 2 ; Hosseini MJ5, 6
Authors
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Authors Affiliations
  1. 1. Experimental Medicine Research Center, Tehran University of Medical Sciences, Tehran, Iran
  2. 2. Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
  3. 3. Department of Human Anatomy and Cell Science, College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
  4. 4. Faculty of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
  5. 5. Zanjan Applied Pharmacology Research Center, Zanjan University of Medical Sciences, Zanjan, Iran
  6. 6. Department of Pharmacology and Toxicology, Faculty of Pharmacy, Zanjan University of Medical Sciences, Zanjan, Iran

Source: Biochimica et Biophysica Acta - General Subjects Published:2015


Abstract

Background Early social isolation stress (SIS) is associated with the occurrence of anxiety behaviors. It seems interaction between the nitrergic system and mitochondrial function plays a role in mediating the anxiety-like behaviors. In this study, we aimed to investigate the anxiolytic effects of tropisetron in animal model of SIS and we try to illustrate the possible role of nitrergic system and mitochondrial function. Methods We applied early social isolation paradigm to male NMRI mice. Animals treated with various doses of tropisetron, nitric oxide agents or their combination and anxiety-like behaviors of animals were assessed using valid behavioral tests including elevated plus maze (EPM), open-field test (OFT) and hole-board test (HBT) in their adulthood. Effects of housing conditions and drug treatments on the mitochondrial function were investigated in the hippocampus by assessing the ATP, GSH, ROS and nitrite levels. Results Anxiogenic effects of early SIS were assessed in the EPM, OFT, and HBT. Also, SIS disrupted mitochondrial function and caused oxidative stress in the hippocampus of stressed animals. Tropisetron showed an anxiolytic effect in the stressed mice. Also, these effects were mediated by nitrergic system by affecting mitochondrial function and modulating the oxidative stress. L-arginine, a nitric oxide precursor, abolished the anxiolytic effects of tropisetron in the behavioral tasks and blocked the protective effects of it against mitochondrial and oxidative challenge. Conclusions and general significance Our results demonstrated tropisetron attenuated the anxiogenic effects of SIS by mitigation of the negative effects of nitric oxide on mitochondrial function. © 2015 Elsevier B.V.All rights reserved.
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