Suppressive effect of bifemelane on lipid peroxidation in rat liver.
The effects of Bifemelane (BF) on lipid peroxidation, the activities of hepatic drug metabolizing enzymes, and the function of cell membranes were examined in rats. In the liver ischemia-reperfusion model, BF suppressed the elevation of the lipid peroxidation level during the period of reperfusion. BF did not exhibit a radical-trapping action using a stable free radical, 1,1-diphenyl-2-picrylhydrazyl (DPPH), which was estimated by electron spin resonance (ESR). BF remarkably inhibited NADPH-dependent lipid peroxidation in vitro. BF had no effect on the contents of cytochrome P-450 and b5 and the activities of NADPH cytochrome P-450 reductase and Cu,Zn-superoxide dismutase (SOD). BF suppressed phorbol myristate acetate (PMA)-induced superoxide formation of polymorphonuclear leukocytes (PMNs), protected hypotonic hemolysis of erythrocyte and inhibited platelet aggregation induced by adenosine diphosphate (ADP) and serum phospholipase A activity. These results suggest that BF has neither radical-trapping activity nor any influence on the drug metabolizing enzymes, but BF has a membrane-stabilizing action and it attributes to the suppressive effect of lipid peroxidation.
Nagai
T
T
Department of Pharmacology, Medical College of Oita, Japan.
Egashira
T
T
Yamanaka
Y
Y
D000818:Animals; D001559:Benzhydryl Compounds / Q000494:pharmacology*; D002462:Cell Membrane / Q000187:drug effects; D015227:Lipid Peroxidation / Q000187:drug effects*; D008099:Liver / Q000187:drug effects* / Q000378:metabolism; D008297:Male; D008315:Malondialdehyde / Q000032:analysis; D006899:Mixed Function Oxygenases / Q000032:analysis; D009249:NADP / Q000378:metabolism; D010974:Platelet Aggregation / Q000187:drug effects; D010975:Platelet Aggregation Inhibitors / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D013482:Superoxide Dismutase / Q000032:analysis; D013481:Superoxides / Q000378:metabolism
D001559:Benzhydryl Compounds; D010975:Platelet Aggregation Inhibitors; D013481:Superoxides; D008315:Malondialdehyde; D009249:NADP; D006899:Mixed Function Oxygenases; D013482:Superoxide Dismutase; C031906:bifemelane