• Kang-Yi Su, Chao Yuan Yu, Ya-Ping Chen, Kuo-Feng Hua, and Yi-Lin Sophia Chen.
• Department of Biotechnology and Animal Science, National Ilan University, Shen-Lung Road, Ilan 260, Taiwan. a221865880@yahoo.com.tw.
• Bmc Complem Altern M. 2014 Jan 13; 14: 21.

BackgroundSaussurea involucrata (Kar. et Kir.) (S. involucrate), is a rare traditional Chinese medicinal herb. Rutin and hispidulin as well as their metabolites are flavonoids of the flavonol type that abound in S. involucrata, which has been reported to inhibit nonoxidative advanced glycation end products which was involved in physiological inflammation. This study aims to investigate the role of 3,4-dihydroxytoluene (DHT), a metabolite of rutin, in inflammatory inhibition and its involved mechanism.MethodsThis study utilized lipopolysaccharide (LPS) stimulated murine macrophage cell line RAW 264.7 as inflammatory model. The inhibitory effects of DHT were evaluated by the expression level of several inflammation markers such as inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) in RAW264.7 after LPS treatment. In addition, underlying mechanisms, the activation of mitogen-activated protein kinases (MAPKs) and NF-κB, were also investigated.ResultsOur results showed that DHT significantly suppressed the LPS-induced production of nitric oxide (NO), iNOS, and COX-2 in a dose-dependent manner without cytotoxicity. DHT also reduced the generation of proinflammatory cytokines majorly in tumor necrosis factor (TNF)-α and minor in interleukin (IL)-1β and IL-6. In addition, LPS-stimulated I-κBα phosphorylation and degradation followed by translocation of the nuclear factor κB (NF-kB)-p65 from the cytoplasm to the nucleus were attenuated after DHT treatment.ConclusionsCombined, the results suggest that DHT might exert anti-inflammatory effects in vitro in LPS stimulated RAW 264.7 macrophages and is potential in adjuvant treatment in inflammation disease.

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