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Cassia tora L. have been used as a folk medicine in Korea. This study investigated anti-inflammatory effect of aurantio-obtusin isolated from C. tora. We isolated aurantio-obtusin from 50% ethanol extracts of C. tora L. We investigated the anti-inflammatory effects of aurantio-obtusin on the lipopolysaccharide (LPS)-stimulated inflammatory response in murine macrophage cell line (Raw 264.7). To investigate the cytotoxicity of aurantio-obtusin on RAW 264.7 cells, MTS assay was performed. RAW 264.7 cells were treated with aurantio-obtusin at different concentrations (12.5, 25, 50, 100 μM) for 30 h. The result showed that aurantio-obtusin had no cytotoxic effect in a concentration range of 12.5 - 100 μM. To determine the effect of aurantio-obtusin on LPS-induced NO production, the NO concentration measurement was performed. RAW 264.7 cells were treated with aurantio-obtusin at 12.5, 25, 50 and 100 μM for 24 h, and the results showed that the NO production of aurantioobtusin- treated cells compared to LPS alone treated group was significantly decreased in a dose-dependent manner. Pretreatment of aurantio-obtusin inhibited LPS-induced NO production in a dose-dependent manner. To find out inhibitory mechanisms of aurantio-obtusin on inflammatory mediators, we examined the PGE₂ pathways. As a result, PGE₂ were decreased in a dose-dependent manner by aurantio-obtusin. The release of interleukin-1β (IL-1β) and IL-6 were also reduced. Moreover, aurantio-obtusin suppressed LPL-induced IκB-α degradation. These results suggest that the down regulation of NO, PGE₂, IL- 1β and IL-6 expression by aurantio-obtusin are achieved by the downregulation of NF-κB activity.

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UCI(KEPA) : I410-ECN-0101-2023-518-000070889