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Complement modulating activity of Rwandan medicinal plants.

P Cos1, N Hermans, B Van Poel

  • 1Faculty of Pharmaceutical Sciences, University of Antwerp, Belgium.

Phytomedicine : International Journal of Phytotherapy and Phytopharmacology
|April 2, 2002
PubMed
Summary

Ethanolic extracts from Rwandan medicinal plants were screened for their effects on the complement system. Three plant extracts demonstrated significant inhibitory activity against both the classical and alternative pathways of complement-mediated hemolysis.

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Area of Science:

  • Pharmacognosy
  • Immunology
  • Ethnobotany

Background:

  • The complement system is crucial in innate immunity and its dysregulation is implicated in various diseases.
  • Medicinal plants are a rich source of bioactive compounds with potential therapeutic applications.
  • Ethnomedicinal knowledge highlights plants used for infections and autoimmune conditions, suggesting potential immunomodulatory properties.

Purpose of the Study:

  • To investigate the complement inhibitory potential of Rwandan medicinal plants.
  • To identify plant extracts that modulate the classical and alternative pathways of the complement system.
  • To explore the mechanism of action of identified complement inhibitors.

Main Methods:

  • Ethanolic extracts of 36 Rwandan medicinal plants were prepared.

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  • Complement-mediated hemolysis assays were performed to assess activity against the classical and alternative pathways.
  • Mechanistic studies were conducted to rule out cation chelation or direct erythrocyte lysis.

    • Main Results:

    • Out of 42 extracts, 8 inhibited the classical pathway and 10 inhibited the alternative pathway.
    • Three extracts, Aspilia pluriseta, Coleus kilimandschari, and Macaranga kilimandscharica (leaves and stem), inhibited both pathways.
    • The observed complement inhibitory activity was independent of bivalent cation chelation or direct effects on erythrocytes.

    Conclusions:

    • Rwandan medicinal plants possess compounds that can modulate the complement system.
    • Aspilia pluriseta, Coleus kilimandschari, and Macaranga kilimandscharica are promising sources for novel complement inhibitors.
    • These findings support the ethnomedicinal use of these plants and warrant further investigation into their therapeutic potential for immune-related disorders.