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Antibodies against a surface protein of Streptococcus pyogenes promote a pathological inflammatory response.

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Author

Summary, in English

Streptococcal toxic shock syndrome (STSS) caused by Streptococcus pyogenes is a clinical condition with a high mortality rate despite modern intensive care. A key feature of STSS is excessive plasma leakage leading to hypovolemic hypotension, disturbed microcirculation and multiorgan failure. Previous work has identified a virulence mechanism in STSS where M1 protein of S. pyogenes forms complexes with fibrinogen that activate neutrophils to release heparin-binding protein (HBP), an inducer of vascular leakage. Here, we report a marked inter-individual difference in the response to M1 protein-induced HBP release, a difference found to be related to IgG antibodies directed against the central region of the M1 protein. To elicit massive HBP release, such antibodies need to be part of the M1 protein-fibrinogen complexes. The data add a novel aspect to bacterial pathogenesis where antibodies contribute to the severity of disease by promoting a pathologic inflammatory response.

Publishing year

2008

Language

English

Publication/Series

PLoS Pathogens

Volume

4

Issue

9

Document type

Journal article

Publisher

Public Library of Science (PLoS)

Topic

  • Microbiology in the medical area

Status

Published

Research group

  • epIgG

ISBN/ISSN/Other

  • ISSN: 1553-7366