[The modification of the catalytic activity of mitochondrial monoaminoxidase and the suppression of the growth of experimental brain tumors].

A derivative of pyrazinocarbazole the antidepressant pyrazidol, whose inhibition of serotonin deaminase activity of the brain mitochondrial monoamine oxidase is attended by induction of the property of catalysing histamine oxidation, inhibits the growth of glial tumors in experiments. Another derivative of pyrazinocarbazole, which inhibits serotonin deamination but does not induce the appearance of histamine deaminase activity, produces no effect on the growth of glial tumors of the brain.