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Related Experiment Videos

Aggregate anaphylaxis and carboxypeptidase N.

J W Ryan, P Berryer, M A Hart

    Advances in Experimental Medicine and Biology
    |January 1, 1986
    PubMed
    Summary
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    Bradykinin (BK) does not appear to mediate anaphylaxis. Inhibiting carboxypeptidase N (CPN) drastically increases anaphylaxis mortality by potentiating anaphylatoxins, not kinins.

    Area of Science:

    • Immunology
    • Pharmacology
    • Pathophysiology

    Background:

    • Bradykinin (BK) is implicated in anaphylaxis pathogenesis.
    • Understanding anaphylaxis mediators is crucial for therapeutic development.

    Purpose of the Study:

    • To investigate the role of kininases in aggregate anaphylaxis.
    • To determine if BK is a mediator in early anaphylaxis.

    Main Methods:

    • Egg albumin-induced anaphylaxis in guinea pigs.
    • Administration of angiotensin-converting enzyme (ACE) and carboxypeptidase N (CPN) inhibitors.
    • Monitoring of blood pressure, lung weight, EKG, and mortality.

    Main Results:

    • ACE inhibitors did not alter anaphylaxis severity.

    Related Experiment Videos

  • CPN inhibition (2-MGP) increased mortality to 94% and lung weight by 180%.
  • CPN inhibition potentiated C3a anaphylatoxin effects, not BK effects.

    • Conclusions:

    • BK is not a primary or secondary mediator of aggregate anaphylaxis.
    • CPN inhibition's adverse effects are due to anaphylatoxin potentiation.
    • This suggests novel therapeutic targets in anaphylaxis management.