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Related Experiment Videos

Action of chlorogenic acid on the complement system.

R Ejzemberg1, M H Da Silva, L Pinto

  • 1Instituto de Microbiologia Prof. Paulo de Góes, UFRJ, Rio de Janeiro.

Anais Da Academia Brasileira De Ciencias
|July 21, 1999
PubMed
Summary

Chlorogenic acid, found in medicinal plants, inhibits the classical complement pathway. This compound did not affect the alternative complement pathway, showing specific anti-complementary action.

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Area of Science:

  • Pharmacology
  • Immunology
  • Biochemistry

Background:

  • Plants used in folk medicine contain compounds with antidotal properties against snake bites.
  • Chlorogenic acid (3-O-caffeoyl quinic acid) is a notable constituent with protein-binding capabilities via hydrophobic interactions and hydrogen bonds.

Purpose of the Study:

  • To investigate the preliminary anti-complementary activity of chlorogenic acid.
  • To determine the effect of chlorogenic acid on the classical and alternative complement pathways.

Main Methods:

  • Human and guinea pig sera treated with chlorogenic acid were used to assess the classical complement pathway's activation using a hemolytic system (sensitized sheep erythrocytes).
  • The alternative complement pathway's activation was studied using human serum treated with chlorogenic acid and zymosan.

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Main Results:

  • Chlorogenic acid demonstrated anti-complementary action on the classical pathway, evidenced by the inability of treated sera to lyse the indicator system.
  • The alternative complement pathway remained unaffected, as indicated by the presence of C3b fragments on zymosan-treated yeast cells.

Conclusions:

  • Chlorogenic acid exhibits specific inhibitory effects on the classical complement pathway.
  • The compound does not interfere with the activation of the alternative complement pathway.