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Related Experiment Videos

Complement-dependent immune complex-induced bronchial inflammation and hyperreactivity.

N W Lukacs1, M M Glovsky, P A Ward

  • 1Department of Pathology, University of Michigan Medical School, Ann Arbor, Michigan 48109-0602, USA. nlukacs@umich.edu

American Journal of Physiology. Lung Cellular and Molecular Physiology
|February 13, 2001
PubMed
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Immune complex deposition causes airway hyperreactivity in mice. Complement system activation, particularly C5a, drives this response, highlighting its role in acute lung injury and asthma-like symptoms.

Area of Science:

  • Immunology
  • Pulmonary Medicine
  • Pathophysiology

Background:

  • Airway hyperreactivity is a key feature of asthma, often triggered by various insults.
  • Immune complex deposition in the lungs can lead to acute lung injury and airway dysfunction.

Purpose of the Study:

  • To investigate the role of the complement system in IgG immune complex-induced airway hyperreactivity in a mouse model.
  • To determine the specific involvement of complement component 5 (C5) and its cleavage product C5a in this airway response.

Main Methods:

  • Induction of acute lung injury via IgG immune complex deposition in mice.
  • Complement depletion using cobra venom factor (CVF).
  • Administration of C5a-specific antisera for blockade.
  • Assessment of airway hyperreactivity, tumor necrosis factor, and histamine levels.

Related Experiment Videos

  • Comparison of responses in C5-sufficient and C5-deficient mice.

    • Main Results:

    • IgG immune complex deposition caused severe airway hyperreactivity peaking at 1 hour.
    • Complement depletion with CVF significantly reduced airway hyperreactivity.
    • Blockade of C5a also markedly reduced airway hyperreactivity.
    • CVF treatment decreased tumor necrosis factor and histamine levels in bronchoalveolar lavage fluid.
    • Airway hyperreactivity was partially reduced in C5-deficient mice, with diminished effects of CVF treatment.

    Conclusions:

    • Acute lung injury induced by IgG immune complexes results in airway hyperreactivity.
    • This airway hyperreactivity is dependent on the complement system, specifically C5 and C5a.
    • The findings suggest a critical role for complement activation pathways in the pathogenesis of asthma-like airway responses.