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NADPH-dependent electron transport chain in microsomes and lipid peroxidation catalyzed by metal ions

Wetzker, R.; Sobolev, A.S.

Acta Biologica et Medica Germanica 38(2-3): 435-442

1979

ISSN/ISBN: 0001-5318
PMID: 42249
Document Number: 151146
Like iron ions copper ions are also able to stimulate the NADPH-dependent lipid peroxidation in rat liver microsomes. This effect is strongly dependent on the concentration of Cu2+ added. Initial concentrations of Cu2+ above 50 microM completely inhibit the formation of malonaldehyde. The activator and inhibitor functions may be interpreted by a simultaneous participation of Cu+ ions formed in the chain branching and termination reaction of the free radical lipid peroxidation process. Inhibition studies with pCMB and the His-reagent diethyl pyrocarbonate indicate an essential role of cysteine and histidine residues in the Cu+-NADPH-dependent lipid peroxidation process.

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