title: Possible melatonin involvement in the hypotensive effect of MAO inhibitors.
abstract: Effect of selective inhibitors of MAO-A and B isoenzymes on pineal melatonin (and related indoles), arterial blood pressure and brain MAO-A and B activities has been evaluated in intact, pinealectomized and sham-operated rats. Selective inhibition of MAO-A but not MAO-B activity stimulated pineal melatonin synthesis and decreased arterial blood pressure in intact and sham-operated animals. Pinealectomy attenuated the hypotensive effect of MAO-A inhibition. The possible melatonin contribution to both antidepressive and hypotensive effects of MAO inhibitors is discussed.
mesh_terms: D000818:Animals; D001794:Blood Pressure / Q000187:drug effects*; D003010:Clorgyline / Q000494:pharmacology; D007527:Isoenzymes / Q000037:antagonists & inhibitors; D008297:Male; D008550:Melatonin / Q000096:biosynthesis*; D008996:Monoamine Oxidase Inhibitors / Q000494:pharmacology*; D010293:Pargyline / Q000494:pharmacology; D010870:Pineal Gland / Q000187:drug effects*; D051381:Rats; D011919:Rats, Inbred Strains; D012642:Selegiline / Q000494:pharmacology
chemical_list: D007527:Isoenzymes; D008996:Monoamine Oxidase Inhibitors; D012642:Selegiline; D010293:Pargyline; D008550:Melatonin; D003010:Clorgyline