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Related Experiment Videos

Phospholipase A2-induced coagulation abnormalities after bee sting.

G Petroianu1, J Liu, U Helfrich

  • 1University of Heidelberg at Mannheim, Department of Pharmacology and Toxicology, Germany. petroia@rumms.uni-mannheim.de

The American Journal of Emergency Medicine
|February 16, 2000
PubMed
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Bee venom phospholipase A2 (PLA2) significantly impacts human blood coagulation, particularly affecting Factor II and prothrombin index (PTi). Clinically used noncompetitive PLA2 inhibitors do not counteract these effects in vitro.

Area of Science:

  • Toxicology
  • Biochemistry
  • Hematology

Background:

  • Bee venom contains phospholipase A2 (PLA2), an enzyme known to affect biological systems.
  • Bee stings can cause toxic or anaphylactic reactions, potentially involving coagulation abnormalities.
  • Understanding the specific effects of bee venom PLA2 on coagulation is crucial for clinical management.

Purpose of the Study:

  • To investigate the correlation between bee venom PLA2 concentrations and various human plasma coagulation parameters.
  • To evaluate the in vitro efficacy of clinically available noncompetitive PLA2 inhibitors against bee venom PLA2-induced anticoagulation.

Main Methods:

  • Bee venom PLA2 was added to human plasma at different concentrations (1.4, 2.7, 4.1 units).
  • Coagulation parameters including PTi, PTT, AT III, SFM, coagulation factors (I, II, V, VIII), and TEG were measured.

Related Experiment Videos

  • The influence of ketamine, lidocaine, magnesium, furosemide, and cromolyn on PLA2-induced effects was assessed.

    • Main Results:

    • Factor II (FII) activity and prothrombin index (PTi) showed a strong negative correlation with bee venom PLA2 concentration (r = -0.88 and -0.86, respectively).
    • Partial thromboplastin time (PTT) showed a positive correlation (r = 0.69), while Factor I, AT III, and SFM remained unchanged.
    • Noncompetitive PLA2 inhibitors tested did not reverse the anticoagulant effects of bee venom PLA2 in vitro.

    Conclusions:

    • Determination of FII activity and/or PTi is recommended for assessing coagulation abnormalities after bee stings.
    • Current noncompetitive PLA2 inhibitors are ineffective in correcting bee venom PLA2-induced anticoagulation in vitro.
    • Further research into competitive PLA2 inhibitors is warranted for potential therapeutic applications.