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Subcritical water-hydrolyzed fish collagen ameliorates survival of endotoxemic mice by inhibiting HMGB1 release in a HO-1-dependent manner.
Biomedicine & Pharmacotherapy 2017 September
To investigate potential mechanisms underlying the bioactivity of hydrolyzed fish collagen, we examined the anti-inflammatory actions of subcritical water-hydrolyzed fish collagen (SWFC) in lipopolysaccharide (LPS)-triggered inflammation and endotoxemia. SWFC markedly inhibited LPS-stimulated release of high mobility group box 1 (HMGB1) in murine RAW264.7 macrophages, along with decreased cytosolic translocation of HMGB1. Both the protein and mRNA levels of heme oxygenase-1 (HO-1) were significantly upregulated in SWFC-treated RAW 264.7 cells in an Nrf2-dependent manner. In line with these effects of SWFC, both HO-1 siRNA and ZnPPIX (zinc protoporphyrin IX) actually attenuated the effects of SWFC on HMGB1 release stimulated by LPS, indicating a possible mechanism by which SWFC modulates HMGB1 release through HO-1 signaling. Notably, administration of SWFC improved the survival rates of LPS-injected endotoxemic mice, in which the serum level of HMGB1 was significantly reduced. Taken together, these results indicate that the anti-inflammatory activities of SWFC are achieved by inhibiting HMGB1 release induced by LPS in a HO-1-sensitive manner.
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