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This study evaluated the antioxidant and anti-inflammatory effects of the hot-water extract of Allium wakegi Araki roots (ARE). The extract was prepared by reflux extraction, concentration, and freeze-drying. Total polyphenol content (TPC) was measured using the Folin–Ciocalteu method and antioxidant activity was assessed by the DPPH radical scavenging assay. ARE showed dose- dependent scavenging activity reaching 62.26±0.95% at 20 mg/mL. RAW 264.7 macrophages were used to examine anti-inflammatory activity. ARE did not exhibit cytotoxicity at concentrations ≤100 μg/mL. Lipopolysaccharide (LPS)-induced nitric oxide (NO) production was significantly reduced by ARE in a dose-dependent manner with the highest inhibition observed at 100, 200 μg/mL. qRT-PCR analysis revealed that ARE suppressed the mRNA expression of iNOS (Nos2) and COX-2 (Ptgs2). Western blot analysis further showed that ARE inhibited LPS-induced p-ERK phosphorylation and reduced the protein levels of iNOS and TNF-α. These results indicate that ARE possesses antioxidant capacity and effectively attenuates inflammation by inhibiting NO production, suppressing pro-inflammatory gene expression, and modulating MAPK signaling. Therefore, ARE may serve as a promising natural ingredient for functional foods targeting oxidative stress and inflammation.

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