Intracellular production of superoxide radical and of hydrogen peroxide by redox active compounds

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Abstract

Several compounds have been found capable of diverting the electron flow in Escherichia coli and thus causing increased intracellular production of O2 and H2O2. One indication of this electron-shunting action was increased cyanide-resistant respiration and one cellular response was increased biosynthesis of the manganese-containing superoxide dismutase and of catalase. Blocking cytochrome oxidase with cyanide or azide increased the electron flow available for reduction of paraquat and presumably of the other exogenous compounds tested and thus increased their biological effects. Paraquat, pyocyanine, phenazine methosulfate, streptonigrin, juglone, menadione, plumbagin, methylene blue, and azure C were all effective in elevating intracellular production of O2 and H2O2. The effect of alloxan appeared paradoxical in that it increased cyanide-resistant respiration without significantly increasing the cell content of the manganese-superoxide dismutase and with only a small effect on the level of catalase. The alloxan effect on cyanide-resistant respiration was artifactual and was due to an oxygen-consuming reaction between alloxan and cyanide, rather than to a diversion of the intracellular electron flow. With paraquat as a representative electron-shunting compound, the increase in biosynthesis of the manganese-superoxide dismutase was prevented by inhibitors of transcription or of translation, but not by an inhibitor of replication. The increase in this enzyme activity, caused by paraquat and presumably by the other compounds, was thus due to de novo enzyme synthesis activated or derepressed at the level of transcription.

References (25)

  • H.M. Hassan et al.

    J. Biol. Chem

    (1977)
  • H.M. Hassan et al.

    J. Biol. Chem

    (1978)
  • O.H. Lowry et al.

    J. Biol. Chem

    (1951)
  • J.M. McCord et al.

    J. Biol. Chem

    (1969)
  • C. Beauchamp et al.

    Anal. Biochem

    (1971)
  • R.F. Beers et al.

    J. Biol. Chem

    (1952)
  • A.G. Gornall et al.

    J. Biol. Chem

    (1949)
  • J.M. McCord et al.

    J. Biol. Chem

    (1970)
  • R.M. Archibald

    J. Biol. Chem

    (1945)
  • B.B. Keele et al.

    J. Biol. Chem

    (1970)
  • F.J. Yost et al.

    J. Biol. Chem

    (1973)
  • H. Dougherty et al.

    J. Biol. Chem

    (1978)
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    This work was supported by research grants from the National Institutes of Health, Bethesda, Md. (GM-10287), the United States Army Research Office, Research Triangle Park, N.C. (DRXRO-PR-P-15319-L), and from Merck, Sharp and Dohme, Rahway, N. J.

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