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Anaphylatoxin formation in sepsis.

A Bengtson1, M Heideman

  • 1Department of Anesthesiology, Sahlgren's Hospital, University of Gothenburg, Sweden.

Archives of Surgery (Chicago, Ill. : 1960)
|May 1, 1988
PubMed
Summary

Sepsis patients showed elevated anaphylatoxins (C3a, C5a) upon admission. Successful treatment normalized these levels, while persistent elevation correlated with organ failure, suggesting anaphylatoxins as sepsis biomarkers.

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Area of Science:

  • Immunology
  • Critical Care Medicine
  • Biochemistry

Background:

  • Sepsis is a life-threatening condition characterized by a dysregulated host response to infection.
  • Complement activation and subsequent anaphylatoxin formation are implicated in sepsis pathogenesis.
  • Anaphylatoxins, such as C3a and C5a, are potent mediators of inflammation.

Purpose of the Study:

  • To investigate complement activation and anaphylatoxin levels in septic patients undergoing treatment.
  • To correlate anaphylatoxin concentrations with treatment outcomes and organ failure.
  • To explore the in vitro effects of corticosteroids on anaphylatoxin formation.

Main Methods:

  • Studied 27 septic patients, measuring plasma levels of complement components (C1INH, C3, C4, C5) and anaphylatoxins (C3a/C3adesArg, C5a/C5adesArg) on admission and weekly.
  • Correlated complement levels with treatment success, ongoing sepsis, and multisystem organ failure.
  • Conducted in vitro studies using Escherichia coli and fresh serum, with and without methylprednisolone.

Main Results:

  • Septic patients had low baseline complement components but elevated anaphylatoxins (C3a/C3adesArg, C5a/C5adesArg) on admission.
  • Successful treatment normalized anaphylatoxin levels within one week.
  • Nine patients with ongoing sepsis showed persistent anaphylatoxin elevation and developed multisystem organ failure.
  • In vitro, Escherichia coli induced dose-dependent anaphylatoxin formation, inhibited by methylprednisolone.

Conclusions:

  • Elevated anaphylatoxin levels (C3a, C5a) are indicative of active complement system involvement in sepsis.
  • Persistent anaphylatoxin elevation during treatment is associated with poor outcomes, including multisystem organ failure.
  • High-dose corticosteroids may mitigate sepsis-induced anaphylatoxin formation.

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