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- W2073123054 abstract "The purpose of this study was to investigate the antioxidant and anti-inflammatory effects of a glycoprotein isolated from the alga Porphyra yezoensis in LPS-stimulated RAW 264.7 mouse macrophages. First, we extracted a novel material with antioxidant activity from P. yezoensis, confirmed by SDS-PAGE to be a glycoprotein, which we named P. yezoensis glycoprotein (PGP). PGP inhibited the production of NO and ROS and expression of iNOS, COX-2, TNF-α and IL-1β, which are involved in the pathogenesis of many inflammation-associated human diseases, including septic shock, hemorrhagic shock and rheumatoid arthritis. Next, we determined the mechanisms behind the antioxidant and anti-inflammatory activities of PGP. We focused on the Toll-like receptor 4 (TLR4) signaling pathway because it is well-known to induce the pro-inflammatory proteins that trigger MAPK and NF-κB activation in lipopolysaccharide (LPS)-induced oxidative events. PGP treatment reduced the formation of the TLR4-IRAK4 and TLR4-TRIF binding complexes in response to LPS. Moreover, it inhibited LPS-induced activation and nuclear translocation of NF-κB by abrogating IκB phosphorylation. PGP also suppressed the phosphorylation of ERK1/2 and JNK in a dose-dependent manner. These results suggest that PGP exerts its anti-inflammatory effects by modulating TLR4 signaling and thus inhibiting the activation of NF-κB and MAP kinases." @default.
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- W2073123054 date "2011-06-23" @default.
- W2073123054 modified "2023-10-16" @default.
- W2073123054 title "A glycoprotein from Porphyra yezoensis produces anti-inflammatory effects in liposaccharide-stimulated macrophages via the TLR4 signaling pathway" @default.
- W2073123054 doi "https://doi.org/10.3892/ijmm.2011.729" @default.
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