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Human C5a des Arg increases vascular permeability.

P J José, M J Forrest, T J Williams

    Journal of Immunology (Baltimore, Md. : 1950)
    |December 1, 1981
    PubMed
    Summary
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    Complement component 5a (C5a) and its des-arginine form (C5a des Arg) induce plasma leakage in vivo. This inflammatory response involves leukocyte-endothelial cell interactions and prostaglandin-mediated vasodilation.

    Area of Science:

    • Immunology
    • Inflammation research
    • Complement system biology

    Background:

    • The complement system plays a crucial role in innate immunity.
    • C5a is a potent anaphylatoxin and chemoattractant generated during complement activation.
    • Understanding C5a's role in inflammation is vital for developing targeted therapies.

    Purpose of the Study:

    • To investigate the in vivo effects of purified C5a and C5a des Arg on vascular permeability.
    • To elucidate the mechanisms underlying C5a-induced plasma leakage.
    • To explore the relationship between C5a's inflammatory activities and its interaction with prostaglandins and leukocytes.

    Main Methods:

    • Generation and purification of human C5a using zymosan and a carboxypeptidase B inhibitor.

    Related Experiment Videos

  • Assessing plasma leakage in rabbit skin induced by C5a and C5a des Arg, alone and in combination with prostaglandin E2 (PGE2).
  • Evaluating the effects of antihistamines and leukocyte depletion on C5a-induced responses.

    • Main Results:

    • Purified C5a induced significant plasma leakage in rabbit skin when co-administered with PGE2.
    • C5a des Arg also increased vascular permeability, independent of spasmogenic activity on the guinea-pig ileum.
    • The C5a-induced plasma leakage was not primarily mediated by histamine release and was abolished in leukocyte-depleted rabbits, suggesting a role for leukocyte-endothelial cell interactions.

    Conclusions:

    • Both C5a and C5a des Arg contribute to inflammatory edema by increasing vascular permeability in vivo.
    • The inflammatory response involves a synergistic effect between C5a-mediated leukocyte recruitment/activation and prostaglandin-induced vasodilation.
    • These findings highlight a dual mechanism in complement-driven inflammation, involving cellular interactions and vasoactive mediators.