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Related Experiment Videos

Complement-induced endothelial dysfunction in rabbits: mechanisms, recovery, and gender differences

P F Lennon1, C D Collard, M A Morrissey

  • 1Department of Anesthesia, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA.

The American Journal of Physiology
|June 1, 1996
PubMed
Summary

Human complement activation impairs blood vessel relaxation. This effect is concentration-dependent, reversible, and more pronounced in males, suggesting complement

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Area of Science:

  • Cardiovascular Physiology
  • Immunology
  • Endothelial Function

Background:

  • Complement activation and impaired endothelium-dependent relaxation are observed in various diseases.
  • Understanding the mechanisms linking complement and vascular dysfunction is crucial for therapeutic development.

Purpose of the Study:

  • To investigate the mechanisms of human complement activation and its impact on endothelium-dependent relaxation in rabbit aortic rings.
  • To determine the duration of this effect, and the influence of gender and serum concentration.

Main Methods:

  • Rabbit thoracic aortic rings were precontracted and exposed to varying concentrations of human serum (HS).
  • Endothelium-dependent relaxation was assessed using acetylcholine (ACh) and calcium ionophore A23187.
  • Experiments involved HS depleted of complement factors, heat-inactivated HS, complement inhibitors, and superoxide dismutase.

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Main Results:

  • Human serum concentration-dependently reduced relaxation to ACh and A23187.
  • This loss was attenuated by complement depletion (factor B, C2, C8), heat inactivation, and inhibitors (sCR1).
  • Superoxide dismutase had no effect; relaxation returned upon HS removal. Male aortic rings showed greater relaxation loss than females.

Conclusions:

  • Complement activation directly impairs endothelium-dependent relaxation via classical and alternative pathways, independent of superoxide.
  • The effect is concentration-dependent, reversible, and mediated by C5b-9 formation.
  • Male endothelial tissue is more susceptible to acute complement-mediated effects than female tissue.