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Scavenging Effects of Echinacea purpurea Extract and Active Ingredient Against Peroxynitrite

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4 Author(s)
Yun-Jing Luo ; Coll. of Life Sci. & Bioeng., Beijing Univ. of Technol., Beijing, China ; Jing-Lin Pan ; Yan-Shu Pan ; Ru Gang Zhong

The present study was to investigate the protective effect of Echinacea, purpurea (E. purpurea) extract, a natural scavenger of peroxynitrite (ONOO-), on the biomolecules injury induced by ONOO- in vitro. The results showed that E. purpurea extract could prevent the ONOO--mediated damage in tyrosine nitration, low density lipoprotein (LDL) oxidation and DNA strand breaks. The ONOO- scavenging ability of E. purpurea in the process of 3-nitrotyrosine (3-NT) formation exhibited dose-dependent manner. The results of LDL oxidation assay indicated that the extract could inhibit LDL oxidation correlates with lipid hydroperoxide concentration. In addition, E. purpurea was able to inhibit ONOO'-induced DNA damage by 50% at a concentration of 150 mug/ml. For further study on the relationship of scavenging activity between the complex and the monomer, we isolated a unique component from E. purpurea, cichoric acid as an active constituent, which has stronger inhibition effects against ONOO--induced tyrosine nitration and DNA single strand breaks.

Published in:

2009 3rd International Conference on Bioinformatics and Biomedical Engineering

Date of Conference:

11-13 June 2009