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Effect of Melia azedarach L. leaf extracts on human complement and polymorphonuclear leukocytes
F Benencia1, M C Courrèges, E J Massouh
1Laboratory of Virology, Facultad de Ciencias Exactas y Naturales, University of Buenos Aires, Argentina.
Journal of Ethnopharmacology
|January 1, 1994
Summary
The water extract of Melia azedarach leaves strongly inhibits human complement activity, particularly the classical pathway. It does not impact polymorphonuclear leukocyte functions like phagocytosis or respiratory burst.
Area of Science:
- Immunology
- Pharmacology
- Ethnobotany
Background:
- The human complement system is crucial for innate immunity.
- Polymorphonuclear leukocytes (PMNs) are key immune cells involved in inflammation and pathogen clearance.
- Melia azedarach L. (Meliaceae) is a plant with traditional medicinal uses.
Purpose of the Study:
- To investigate the in vitro effects of Melia azedarach leaf water extract on human complement.
- To evaluate the extract's impact on polymorphonuclear leukocyte (PMN) functions.
Main Methods:
- Complement activity was assessed using classical pathway assays.
- PMN phagocytic activity was measured.
- Respiratory burst in PMNs was evaluated using the nitro blue tetrazolium (NBT) reduction assay.
Main Results:
- The Melia azedarach leaf extract exhibited significant anticomplementary activity.
- This inhibitory effect was more pronounced in the classical complement pathway.
- The extract did not inhibit PMN phagocytosis or respiratory burst.
Conclusions:
- Melia azedarach leaf water extract possesses potent anticomplementary properties.
- The extract selectively targets the complement system without affecting key PMN functions.
- These findings suggest potential therapeutic applications for Melia azedarach in complement-mediated inflammatory conditions.