Potentiation by sulfide of hydrogen peroxide-induced killing of Escherichia coli

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Berglin, Ewa H.,MD, PhD,1955-Umeå universitet,Oral mikrobiologi (författare)

Potentiation by sulfide of hydrogen peroxide-induced killing of Escherichia coli

Artikel/kapitelEngelska1985

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American Society for Microbiology,1985
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LIBRIS-ID:oai:DiVA.org:umu-151251
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-151251URI

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Språk:engelska
Sammanfattning på:engelska

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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.

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NATURVETENSKAP Kemi Organisk kemi hsv//swe
NATURAL SCIENCES Chemical Sciences Organic Chemistry hsv//eng

Biuppslag (personer, institutioner, konferenser, titlar ...)

Carlsson, JanUmeå universitet,Oral mikrobiologi (författare)
Umeå universitetOral mikrobiologi (creator_code:org_t)

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Ingår i:Infection and Immunity: American Society for Microbiology49:3, s. 538-5430019-95671098-5522

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Infection and Immunity (Sök värdpublikationen i LIBRIS)

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Av författaren/redakt...: Berglin, Ewa H., ...; Carlsson, Jan

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NATURVETENSKAP: NATURVETENSKAP; och Kemi; och Organisk kemi

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Av lärosätet: Umeå universitet

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