The effect of glutathione on the vitamin E requirement for inhibition of liver microsomal lipid peroxidation.
Vitamin E dependent inhibition of rat liver microsomal lipid peroxidation in an NADPH and ADP-Fe+3 containing system occurred at lower vitamin E concentrations in the presence of glutathione (GSH). Using microsomes from rats fed a vitamin E deficient diet, vitamin E was shown to be required for inhibition. Inhibition also required the presence of a storage labile microsomal component, since no inhibition was observed when using microsomes that had been stored for one month. This observation provides evidence that direct reduction of reversibly oxidized vitamin E by GSH does not appear to contribute significantly to inhibition of peroxidation. During GSH and vitamin E dependent inhibition of lipid peroxidation, vitamin E (reduced form) concentrations remained constant, indicating that GSH maintained vitamin E concentrations. Without GSH, vitamin E concentrations dropped rapidly. By adding vitamin E to microsomes, it was found that inhibition of lipid peroxidation in the presence of GSH occurred at about five-fold less vitamin E than in the absence of GSH. Inhibition at these lower levels of vitamin E was 85-90% complete. Results indicate that GSH can be used to maintain vitamin E (reduced form) concentrations, thereby lowering the concentration of vitamin E necessary to inhibit microsomal lipid peroxidation.
Leedle
R A
RA
Department of Pathology, Michigan State University, East Lansing.
Aust
S D
SD
D000244:Adenosine Diphosphate / Q000031:analogs & derivatives / Q000378:metabolism; D000818:Animals; D004305:Dose-Response Relationship, Drug; D005978:Glutathione / Q000494:pharmacology*; D015227:Lipid Peroxidation / Q000187:drug effects*; D008862:Microsomes, Liver / Q000201:enzymology / Q000378:metabolism*; D009249:NADP / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D013997:Time Factors; D014810:Vitamin E / Q000032:analysis / Q000502:physiology*
C029936:adenosine diphosphate-ferric chelate; D014810:Vitamin E; D009249:NADP; D000244:Adenosine Diphosphate; D005978:Glutathione