Table of Contents
ISRN Pharmacology
Volume 2014, Article ID 324063, 12 pages
Research Article

Antidepressant Effects of Mallotus oppositifolius in Acute Murine Models

1Department of Pharmacology, University of Ghana Medical School, College of Health Sciences, University of Ghana, Accra, Ghana
2Department of Pharmacology, Faculty of Pharmacy and Pharmaceutical Sciences, Kwame Nkrumah University of Science and Technology, Kumasi, Ghana
3Department of Biomedical and Forensic Sciences, School of Biological Science, University of Cape Coast, Cape Coast, Ghana

Received 25 November 2013; Accepted 18 December 2013; Published 12 March 2014

Academic Editors: P. S. D'Aquila, A. Fernandez-Guasti, and S. Mingmalairak

Copyright © 2014 Kennedy K. E. Kukuia et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Objective. Hydroalcoholic extract of leaves of Mallotus oppositifolius (MOE), a plant used for CNS conditions in Ghana, was investigated for acute antidepressant effects in the forced swimming (FST) and tail suspension tests (TST). Results. In both FST and TST, MOE (10, 30, and 100 mg kg−1) significantly decreased immobility periods and frequencies. A 3-day pretreatment with 200 mg kg−1, i.p., para-chlorophenylalanine (PCPA), a tryptophan hydroxylase inhibitor, reversed the decline in immobility and the increase of swimming score induced by MOE in the modified FST. Pretreatment with reserpine alone (1 mg kg−1), α-methyldopa alone (400 mg kg−1, i.p.), or a combination of both drugs failed to reverse the decline in immobility or the increase in swimming score caused by the extract in the modified FST. The extract potentiated the frequency of head twitch responses induced by 5-hydroxytryptamine. Pretreatment with d-serine (600 mg kg−1, i.p.), glycine/NMDA agonist, abolished the behavioural effects of MOE while d-cycloserine (2.5 mg kg−1, i.p.), a glycine/NMDA partial agonist, potentiated it in both TST and modified FST. Conclusion. The extract exhibited antidepressant effects in mice which is mediated by enhancement of serotoninergic neurotransmission and inhibition of glycine/NMDA receptor activation.