STZ-induced diabetes resulted in the significant depressive phenotypes in mice.
4i, a novel 5HT3 receptor antagonist prevented diabetes-induced depressive phenotypes in mice.
4i normalized reduced serotonin levels in mid brain, prefrontal cortex and cerebellum.
mCPBG, a selective 5HT3 receptor agonist abolished 4i responses in diabetic mice.
Antidepressant effect of 4i may be mediated by 5HT3 receptor antagonism and increase in serotonin levels.