Factors involved in the depression of hepatic mixed function oxidase during infections with Listeria monocytogenes.
A number of infections are capable of depressing the capacity of the liver to metabolize drugs. We have studied a number of factors which could be involved in the depression of cytochrome P-450 and related drug biotransformation enzymes during infections with Listeria monocytogenes. During the course of the infection, drug metabolism and heme content of hepatic microsomes were depressed but heme oxygenase was elevated. A free radical scavenger alpha-tocopherol did not prevent the loss and xanthine oxidase activities did not correlate with the time course of the loss. Infections in susceptible (balb/c) mice produced a larger loss in drug metabolism than in resistant (C57BL/6) mice, and an avirulent strain of the bacteria was without effect. A preparation of hemolysin isolated from Listeria monocytogenes produced a dose-dependent loss of cytochrome P-450 in isolated hepatocytes. These experiments indicate that the loss of drug metabolism during Listeria infections is most likely due to hemolysin released by the bacteria.
Azri
S
S
Department of Pharmacology, Dalhousie University, Halifax, Nova Scotia, Canada.
Renton
K W
KW
D000818:Animals; D001711:Biotransformation; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism; D005609:Free Radicals; D006418:Heme / Q000378:metabolism; D006419:Heme Oxygenase (Decyclizing) / Q000378:metabolism; D015227:Lipid Peroxidation; D008088:Listeriosis / Q000378:metabolism*; D008099:Liver / Q000378:metabolism*; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D006899:Mixed Function Oxygenases / Q000378:metabolism*; D015262:Xenobiotics / Q000493:pharmacokinetics
D005609:Free Radicals; D015262:Xenobiotics; D006418:Heme; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D006419:Heme Oxygenase (Decyclizing)