PMID: 4964565Dec 1, 1967

Iodination of bacteria: a bactericidal mechanism

The Journal of Experimental Medicine
S J Klebanoff


Myeloperoxidase, iodide, and H(2)O(2) have a bactericidal effect on Escherichia coli. Myeloperoxidase can be replaced in this system by lactoperoxidase or by a guinea pig leukocyte particulate preparation, H(2)O(2) by an H(2)O(2)-generating system such as glucose and glucose oxidase, and iodide by thyroxine or triiodothyronine. The bactericidal effect was high at pH 5.0 and fell as the pH was increased. Preincubation of myeloperoxidase, iodide, and H(2)O(2) for 30 min before the addition of the bacteria largely prevented the bactericidal effect. Thus, the organisms must be present in the reaction mixture during iodide oxidation for maximum killing, which suggests the involvement of labile intermediates of iodide oxidation rather than the more stable end products of oxidation such as iodine. Iodination of the bacteria by the myeloperoxidase-iodide-H(2)O(2) system was demonstrated chemically and radioautographically. Iodination and the bactericidal effect were similarly affected by changes in experimental conditions in all the parameters tested (effect of preincubation, pH, and inhibitors). Phagocytosis of bacteria by guinea pig leukocytes was associated with the conversion of iodide to a trichloroacetic acid-precipitable form. I...Continue Reading


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