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. 1994 Feb;62(2):398–404. doi: 10.1128/iai.62.2.398-404.1994

Septicemia-inducing Escherichia coli O115:K"V165"F165(1) resists killing by porcine polymorphonuclear leukocytes in vitro: role of F165(1) fimbriae and K"V165" O-antigen capsule.

M Ngeleka 1, B Martineau-Doizé 1, J M Fairbrother 1
PMCID: PMC186121  PMID: 7507891

Abstract

Escherichia coli O115:K"V165":F165(1) wild-type strain 5131 survives in the bloodstream of experimentally inoculated gnotobiotic pigs and induces septicemia, whereas its afimbriate (F165(1)-negative) TnphoA mutant M48 and its acapsular (K"V165"-negative) spontaneous mutant 5131a are both nonpathogenic. We evaluated the role of the mannose-resistant F165(1) fimbrial system and of the O-antigen K"V165" capsule in resistance to phagocytosis by porcine polymorphonuclear leucocytes (PMNLs) in vitro. F165(1)-positive strains (5131 and 5131a) attached to and were ingested by PMNLs at a significantly higher level than afimbrial mutant M48 (P < 0.001) after 1 h of incubation. During incubation of these strains with PMNLs for up to 6 h, parental strain 5131 resisted killing whereas afimbriate mutant M48 and acapsular mutant 5131a were gradually killed and were found at significantly lower numbers than the parental strain 5131 at 2 (P < 0.05) and 6 (P < 0.001) h. When bacteria were opsonized with normal pig serum, the afimbriate and acapsular mutants survived less well than when the bacteria were nonopsonized. Upon examination by electron microscopy of PMNLs after 2 h of incubation with bacteria, structurally normal bacteria were observed more often within phagosomes of PMNLs incubated with the parental strain than within phagosomes of PMNLs incubated with the afimbriate or the acapsular mutant. The extracellular oxidative response (as tested by release of hydrogen peroxide) of PMNLs stimulated by phorbol myristate acetate was completely inhibited by F165(1)-positive strains but only partially inhibited by the afimbriate mutant. These results suggest that the F165(1) fimbrial system may mediate adherence of E. coli O115 to PMNLs. Survival of the parental strain in the presence of PMNLs, which may be intracellular, is at least partially due to the presence of the F165(1) fimbrial system and of the O-antigen capsule K"V165". Furthermore, the presence of the F165(1) fimbrial system may contribute to the bacterial inhibition of the oxidative response of porcine PMNLs.

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Selected References

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