Suppression Effect ofCinnamomum cassiaBark-Derived Component on Nitric Oxide Synthase

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Abstract

The inhibitory effects of Cinnamomum cassia bark-derived material on nitric oxide (NO) production in RAW 264.7 cells was determined through the evaluation of NO production and expression of inducible nitric oxide and compared to the effects of three commercially available compounds, cinnamyl alcohol, cinnamic acid, and eugenol. The biologically active constituents of C. cassia extract were characterized as trans-cinnamaldehyde by spectral analysis. The inhibitory effects varied with both chemical and concentration used. Potent inhibitory effects of cinnamaldehyde against NO production were 81.5 and 71.7% at 1.0 and 0.5 microg/microL, respectively, and a 41.2% inhibitory effect was revealed at 0.1 microg/microL. However, little or no activity was observed for cinnamic acid and eugenol. Suppression effects of cinnamaldehyde on inducible nitric oxide synthase expression were revealed by Western blot analysis. As a naturally occurring therapeutic agent, trans-cinnamaldehyde could be useful for developing new types of NO inhibitors.

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