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Research Article

Effects of adhesins from mannose-resistant Escherichia coli on mediator release from human lymphocytes, monocytes, and basophils and from polymorphonuclear granulocytes.

Y Ventur, J Scheffer, J Hacker, W Goebel, W König
Y Ventur
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J Scheffer
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J Hacker
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W Goebel
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W König
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ABSTRACT

We investigated the role of Escherichia coli expressing mannose-resistant hemagglutination and adhesins with regard to the induction of leukotrienes from a suspension of human lymphocytes, monocytes, and basophils (LMBs) compared with human polymorphonuclear granulocytes (PMNs). Genetically cloned E. coli strains expressing various types of mannose-resistant hemagglutination (MRH+) were phagocytosed to a higher degree by monocytes than the nonadherent E. coli strain. The various strains differed in their capacity to induce a chemiluminescence response, which showed the same pattern for LMBs and PMNs. Stimulation of LMBs with bacteria alone, unlike granulocytes, did not activate the cells for the release of leukotrienes. However, preincubation of LMBs with bacteria decreased subsequent leukotriene formation when the cells were stimulated with calcium ionophore. The inhibitory effect was dependent on the concentration of bacteria used for preincubation as well as on the preincubation temperature. The various bacterial strains differed in inhibitory potency for mediator release. Preincubation of LMBs with zymosan, opsonized zymosan, the bacterial peptide FMLP, and peptidoglycan had no inhibitory effect or even increased subsequent leukotriene formation. Opsonized bacteria were far less inhibitory than nonopsonized bacteria. In contrast to human LMBs, preincubation of human PMNs with mannose-resistant bacteria led to increased leukotriene B4 generation and reduced w-oxidation of leukotriene B4. Our data suggest that phagocytes (neutrophils, monocytes) respond in a different way for leukotriene formation after interaction with mannose-resistant E. coli.

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Effects of adhesins from mannose-resistant Escherichia coli on mediator release from human lymphocytes, monocytes, and basophils and from polymorphonuclear granulocytes.
Y Ventur, J Scheffer, J Hacker, W Goebel, W König
Infection and Immunity Jun 1990, 58 (6) 1500-1508; DOI:

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Effects of adhesins from mannose-resistant Escherichia coli on mediator release from human lymphocytes, monocytes, and basophils and from polymorphonuclear granulocytes.
Y Ventur, J Scheffer, J Hacker, W Goebel, W König
Infection and Immunity Jun 1990, 58 (6) 1500-1508; DOI:
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