Anti-anxiety and Anti-depressant Like Effects of Murraya koenigii in Experimental Models of Anxiety and Depression.

Background: Presence of free radical scavenging activity in Murraya koenigii , commonly known as Curry leaves, has been shown in previous studies. Oxidative stress plays an important role in the development of various neurobehavioral disorders including anxiety and depression.

Aim: The present study aimed to evaluate the effects of Murraya koenigii in animal models of depression and anxiety.

Materials and Methods: The effect of incremental doses of Murraya koenigii aqueous leaf extract was evaluated on spontaneous motor activity (SMA), open arm incursions in elevated plus maze, and despair behaviour in forced swim (FST) and tail suspension (TST) tests as compared to control groups in Swiss albino mice.

Results: Murraya koenigii 300 mg/kg, p.o. (MK300) and 400 mg/kg, p.o. (MK400) reduced the SMA count from 754 ± 64.9 to 540 ± 29 and 295 ± 34 respectively, which was statistically significant. MK300 and MK400 reduced significantly the open arm count from 29 ± 8.6 to 16 ± 7 and 10 ± 3.9, respectively. On FST, MK400 reduced the duration of immobility from 145.5 ± 29 to 91 ± 17.3, which was statistically significant. On TST, MK produced a dose-dependent decrease in the duration of immobility; however, it was statistically significant only with MK400.

Conclusion: Murraya koenigii aqueous leaf extract reduced the despair behavior in experimental animal models, suggesting an anti-depressant like activity. Murraya koenigii extract also reduced spontaneous locomotor activity in a dose-dependent manner suggesting a sedative and/or anxiolytic effect though there wasn't any anxiolytic effect in the elevated plus maze test.