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Potentiation by sulfide of hydrogen peroxide-induced killing of Escherichia coli
Umeå University, Faculty of Medicine, Department of Odontology, Oral Microbiology.
Umeå University, Faculty of Medicine, Department of Odontology, Oral Microbiology.
1985 (English)In: Infection and Immunity, ISSN 0019-9567, E-ISSN 1098-5522, Vol. 49, no 3, p. 538-543Article in journal (Refereed) Published
Abstract [en]

L-Cysteine potentiates 100-fold the hydrogen peroxide-induced killing of a growing culture of Escherichia coli K-12 (Berglin et al., J. Bacteriol. 152:81-88). In the present study it is shown that hydrogen sulfide is formed from L-cysteine and that sodium sulfide could substitute for L-cysteine in the potentiation of hydrogen peroxide-induced killing of E. coli K-12. Addition of an amino acid, L-leucine, L-valine, or L-alanine, to an L-cysteine-containing medium with a growing culture of E. coli K-12 inhibited hydrogen sulfide formation and the potentiation of hydrogen peroxide-induced killing. These amino acids did not inhibit hydrogen sulfide formation from L-cysteine by a cell extract, and they did not inhibit the potentiation by sulfide of hydrogen peroxide-induced killing. This indicated that the amino acids protected the culture from L-cysteine-potentiated, hydrogen peroxide-induced killing by inhibiting the transport of L-cysteine into the cell. The potentiation by sodium sulfide of hydrogen peroxide-induced killing was abolished by the metal ion chelator 2,2'-bipyridyl. This indicated that metal ions, in addition to sulfide, were involved in the killing. Toxic effects of hydrogen peroxide are often presumed to be mediated by hydroxyl radicals formed in iron-catalyzed reactions. It was demonstrated that iron sulfide was more efficient than ferrous iron in catalyzing the formation of hydroxyl radicals from hydrogen peroxide. It was suggested that hydrogen sulfide formed in polymicrobial infections may play an important role in the host defense by potentiating the antimicrobial effect of hydrogen peroxide produced by phagocytic cells.

Place, publisher, year, edition, pages
American Society for Microbiology , 1985. Vol. 49, no 3, p. 538-543
National Category
Organic Chemistry
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URN: urn:nbn:se:umu:diva-151251ISI: A1985AQB9100014PubMedID: 3897055Scopus ID: 2-s2.0-0021871249OAI: oai:DiVA.org:umu-151251DiVA, id: diva2:1243179
Available from: 2018-08-30 Created: 2018-08-30 Last updated: 2018-11-07Bibliographically approved

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Berglin, Ewa H.

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