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Related Experiment Videos

Complement activation by diesel exhaust particles (DEP)

H Kanemitsu1, S Nagasawa, M Sagai

  • 1Department of Immunology and Microbiology, Faculty of Pharmaceutical Sciences, Health Sciences University of Hokkaido, Japan.

Biological & Pharmaceutical Bulletin
|March 26, 1998
PubMed
Summary
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Diesel exhaust particles (DEP) activate the alternative pathway of the human complement system. This activation reduces hemolytic complement activity and produces inflammatory mediators, potentially impacting lung health.

Area of Science:

  • Immunology
  • Environmental Health
  • Toxicology

Background:

  • Diesel exhaust particles (DEP) are common environmental pollutants.
  • The human complement system is crucial for immune defense.
  • The interaction between DEP and the complement system is not fully understood.

Purpose of the Study:

  • To investigate the effect of DEP on human serum complement activity.
  • To determine which complement pathway is affected by DEP.

Main Methods:

  • Human serum was incubated with DEP extracts at different temperatures and in the presence of specific chelators (EGTA/Mg, EDTA).
  • Hemolytic activity of complement was measured.
  • Cleavage of the third component of complement (C3) was analyzed using immunoelectrophoresis.

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Main Results:

  • DEP extracts dose-dependently decreased complement's hemolytic activity at 37°C but not at 4°C.
  • Evidence indicated activation of the alternative complement pathway by DEP extracts.
  • Cleavage of C3 to C3b was observed, confirming alternative pathway activation.

Conclusions:

  • DEP activates the alternative pathway of the human complement system.
  • This activation leads to reduced hemolytic activity and the generation of bioactive complement fragments.
  • Potential implications for inflammatory responses in the alveoli, such as neutrophil influx, are discussed.