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Serum opsonic capacity against Yersinia enterocolitica O:3 in yersiniosis patients with or without reactive arthritis.
Authors:R Tertti   K Granfors   R Lahesmaa-Rantala     A Toivanen
Affiliation:Department of Medical Microbiology, Turku University, Finland.
Abstract:The opsonic capacity of 45 sera from patients with reactive arthritis after Yersinia enterocolitica O:3 infection and of 45 matched sera from yersiniosis patients without post-infection complications was studied at 1-3 months, 5-8 months and 12-20 months after the onset of the infection. Antibody-mediated opsonization of virulence-plasmid-containing Y. enterocolitica O:3 was studied by measuring complement-fixation on opsonized bacteria and opsonophagocytic function of the polymorphonuclear leucocytes (PMN). The PMN response against bacteria pre-opsonized by heat-inactivated sera was measured by using a chemiluminescence (CL) assay. The fixation of complement Clq and C3 on bacteria was determined by flow cytometry using fluorescein-conjugated Clq- and C3c-antisera. All the sera were strongly opsonic at the onset of the infection, and this capacity persisted in most of the patients still at the end of the follow-up. No difference was observed in complement-fixing capacity between the sera of the two groups, but the sera from arthritic patients showed stronger augmentation of PMN CL response at the early phase of the infection (P = 0.005 in the presence of complement, P = 0.04 in the absence of complement). These results suggest that enhanced opsonic capacity may play a role in the development of Yersinia-triggered reactive arthritis by leading to strong activation of the PMN and, consequently, to release of inflammatory mediators.
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