Effect of antidepressant drug on semicarbazide-sensitive amine oxidase (SSAO) in dog brain.

The present study examined whether or not other cyclic antidepressants, such as the dicyclic drug zimeldine, the tricyclic drug imipramine, and tetracyclic drug maprotiline, and the noncyclic drug nomifensine, inhibit semicarbazide-sensitive amine oxidase (SSAO) activity in dog brain. After treatment with 100 nM clorgyline and 100 nM deprenyl, all four antidepressant drugs inhibit SSAO activity in dog brain. The most potent of inhibition was observed by imipramine, followed by maprotiline, zimeldine and nomifensine. All four drugs are noncompetitive inhibitor of SSAO in dog brain. We found the tricyclic antidepressant drug imipramine to be the most selective inhibitors of SSAO activity in dog brain, as compared with other type of antidepressant drugs.