Paraquat and NADPH-dependent lipid peroxidation in lung microsomes.

Since there exists some controversy in the literature as to whether paraquat augments microsomal lipid peroxidation via superoxide anion (O2-), the role of paraquat and active oxygen species in NADPH-dependent lung microsomal lipid peroxidation was investigated. Incubation of buffered aerobic mixture of bovine lung microsome and NADPH, in the presence or absence of exogenously added iron, resulted in a progressive formation of lipid peroxides whose accumulation could be followed at 535 nm as malondialdehyde. Paraquat strongly inhibited this lipid peroxidation. Thus, malondialdehyde formation was 50% inhibited by 4 X 10(-5) M paraquat in the reaction mixture. The malondialdehyde color development by lipid peroxides was not affected by this concentration of paraquat. Lipid peroxidation was also strongly inhibited by singlet oxygen scavengers, e.g. dimethylfuran and diphenylfuran, and by catalase. Hydroxyl radical scavengers, e.g. mannitol, benzoate, and ethanol, had little effect in malondialdehyde production. Superoxide dismutase, which removes O2- efficiently, did not inhibit malondialdehyde production by lung microsomes and rather enhanced its formation. A scheme in which paraquat and active O2 species may be involved with microsomal lipid peroxidation is presented.

• Publication year

  1981

• Venue

  Journal of Biological Chemistry

• Publication date

  1981-10-10

• Fields of study

  Medicine, Chemistry, Environmental Science

• Identifiers
  DOI 10.1016/s0021-9258(19)68729-6PMID 7275991
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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