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The anti-inflammatory effect of alginate oligosaccharides on LPS-induced RAW 264.7 cells was investigated at different time points (0-60 h). The alginate oligosaccharides were produced by an alginate-degrading enzyme from Shewanella oneidensis PKA1008. The alginate oligosaccharides decreased the production of nitric oxide and proinflammatory cytokines [tumor necrosis factor-, interleukin (IL)-, and IL-6] in a dose-dependent manner. The alginate oligosaccharides showed peak anti-inflammatory activity after 36 h of incubation; at that time point, reduced protein expression of NF- p65, iNOS, and COX-2 was detected. Furthermore, the alginate oligosaccharide treatment reduced the formation of ear edema at 36 h compared to samples examined at 0 h when the oligosaccharides were administered at 50 and 250 mg/kg body weight, as well as dermal thickness and mast cell numbers in a histological analysis. These results suggest that alginate oligosaccharides are a promising anti-inflammatory agent.

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Anti-Inflammatory Effect of Alginate Oligosaccharides Produced by an Alginate-Degrading Enzyme from Shewanella oneidensis PKA1008 on LPS-Induced RAW 264.7 Cells