MICROBIOLOGY and IMMUNOLOGY
Online ISSN : 1348-0421
Print ISSN : 0385-5600
ISSN-L : 0385-5600
The Bactericidal Mechanisms of Polymorphonuclear Leukocytes against Bacteroides fragilis
Significance of the Oxygen-Dependent System
Toshiro NISHIMURAMasataka SASADAAkemi KUBOTokio KAKITAToshihiro MORIGUCHIHaruto UCHINO
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1987 Volume 31 Issue 4 Pages 357-366

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Abstract
The mechanism by which polymorphonuclear leukocytes (PMNs) kill ingested Bacteroides fragilis was examined using PMNs from patients with chronic granulomatous disease (CGD) which is an inherited disease characterized by the defect of their PMNs in oxygen-radical generation. The phagocytosis of B. fragilis by PMNs from CGD patients was comparable to that by normal PMNs. Although CGD cells killed B. fragilis to some extent, they did so less effectively than the normal PMNS. B. fragilis was killed by a xanthine oxidase system that generates oxygen radicals. When PMNs were incubated with opsonized B. fragilis, B. fragilis triggered the release of O2- and H2O2 from normal PMNs. Thus, normal PMNs appear to kill B. fragilis by both oxygen-dependent and oxygen-independent mechanisms.
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