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http://dx.doi.org/10.5352/JLS.2022.32.7.491

Anti-inflammatory Efficacy of HK Shiitake Mushroom Mycelium in LPS-treated RAW 264.7 Cells Through Down-regulation of NF-κB Activation  

Song, Chae Yeong (HK Biotech. Co., Ltd.)
Oh, Tae Woo (Korea Institute of Oriental Medicine)
Kim, Hoon Hwan (College of Veterinary Medicine, Gyeongsang National University)
Lee, Yu Bin (HK Biotech. Co., Ltd.)
Kim, Jeong Ok (HK Biotech. Co., Ltd.)
Kim, Gon Sup (College of Veterinary Medicine, Gyeongsang National University)
Ha, Yeong Lae (HK Biotech. Co., Ltd.)
Publication Information
Journal of Life Science / v.32, no.7, 2022 , pp. 491-500 More about this Journal
Abstract
HK shiitake mushroom mycelium (HKSMM), containing 14% β-glucan, is a health functional food ingredient individually approved by the Korea Ministry of Food and Drug Safety for liver health. The anti-inflammatory effect of a 50% aqueous ethanol extract of HKSMM (designated HKSMM50) was studied in RAW 264.7 macrophage cells treated with lipopolysaccharide (LPS). An active hexose correlated compound (AHCC) was used as a positive control. LPS-activated RAW 264.7 cells were treated with HKSMM50 and AHCC (0, 20, 100, 500 ㎍/ml) and cultured for 24 hr. Inflammation-related elements in the supernatant were measured using enzyme-linked immunosorbent assay (ELISA) kits, and the expression of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) proteins in the cells was analyzed by Western blotting. The HKSMM50 lowered iNOS and COX-2 protein expressions, and nuclear factor-kappa B (NF-κB), nitric oxide (NO) and prostaglandin E2 (PGE2) contents in a concentration-dependent manner as compared to LPS treatment. Similarly, the HKSMM50 lowered the content of pro-inflammatory cytokines interleukin-1β (IL-1β), tumor necrosis factor-α (TNF-α), interleukin-4 (IL-4) and interleukin-6 (IL-6) contents and increased the activity of antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT). The efficacy of the AHCC treatment was similar to that of the HKSSM50 treatments. These results indicate that HKSMM50 showed an anti-inflammatory effect in LPS-treated RAW 264.7 cells by down-regulation of NF-κB signaling and suggest that HKSMM could be used as a health functional food ingredient to help improve immune function.
Keywords
COX-2; HK shiitake mushroom mycelium; iNOS; NF-${\kappa}B$; RAW 264.7 cells;
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