Antioxidant, Anti-Inflammatory and Anti-Influenza Properties of Components from Chaenomeles speciosa
Institute of Materia Medica, Chinese Academy of Medical Sciences, Beijing 100050, China
State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, The Chinese Academy of Sciences, Kunming 650204, China
Author to whom correspondence should be addressed.
Molecules 2010, 15(11), 8507-8517; https://doi.org/10.3390/molecules15118507
Received: 1 November 2010 / Revised: 15 November 2010 / Accepted: 17 November 2010 / Published: 22 November 2010
(This article belongs to the Special Issue Antioxidants)
The fruit of Chaenomeles speciosa is a traditional Chinese medicine used for the treatment of dyspepsia and various inflammatory diseases. In the present study, we evaluated the potential radical scavenging capacity, and activity against nitrous oxide, inflammatory cytokines production and neuramindase (NA) of its isolates. The results showed that 3,4-dihydroxybenzoic acid (1) displayed higher inhibitory activities on DPPH and NA with IC50 values of 1.02 mg/mL and 1.27 mg/mL respectively, and quercetin (2) also showed significant inhibitory action on DPPH and NA, with IC50 values of 3.82 mg/mL and 1.90 mg/mL. Compounds 1, 2 and methyl 3-hydroxybutanedioic ester (3) could inhibit the production of TNF-a by 22.73%, 33.14% and 37.19% at 5 mg/mL (P < 0.05) compared with the control. In addition, compound 2 was found to be active on the release of IL-6 in RAW264.7 macrophage cells, with an inhibitory rate of 39.79% (P < 0.05). The anti-inflammatory effect of compound 3 is disclosed for the first time in this study. Avian influenza is usually accompanied by virus invasion followed by the occurrence of oxidative stress and serious inflammation, so the multiple effects of the isolates may play a cocktail-like role in the treatment of avian influenza, and C. speciosa components, especially quercetin, might be a potent source for anti-viral and anti-inflammatory agents.