{"title":"一种产自海鲂幼虫的酸性异聚糖的结构特征和免疫增强特性","authors":"","doi":"10.1016/j.fufo.2024.100439","DOIUrl":null,"url":null,"abstract":"<div><p>Edible insects are a promising source of bioactive compounds with diverse health benefits. This study investigated the immunomodulatory properties of polysaccharides isolated from <em>Protaetia brevitarsis seulensis</em> larvae (PBSL). Polysaccharides were fractionated using a molecular weight cutoff membrane, and among these fractions, the higher molecular weight fraction (H-PBSL, 666.84 kDa) demonstrated significant immunomodulatory activity. Methylation and NMR structural analyses revealed H-PBSL to be an acidic heteroglycan with a complex structure, consisting of a backbone of repeating (1→4)-linked α-glucan units highly branched at <em>O</em>-6 positions with T-α-Glc<em>p</em>, T-α-Glc<em>p</em>A, and T-β-Gal<em>p</em>. The immunomodulatory effects of H-PBSL were evaluated using RAW264.7 macrophage cells. H-PBSL treatment enhanced phagocytic activity and increased the expression of immune modulators and macrophage activation surface molecules. In addition, H-PBSL activated the NF-κB signaling pathway, evidenced by increased phosphorylation of IκB and NF-κB, and translocation of NF-κB from cytosol to nucleus. Moreover, inhibition of Toll-like receptor 4 (TLR4) reduced H-PBSL-induced nitric oxide synthesis, indicating TLR4′s pivotal role in H-PBSL-mediated macrophage activation. These findings highlight the potential of H-PBSL as a novel immunomodulatory agent derived from an edible insect, with possible applications in functional foods and nutraceuticals.</p></div>","PeriodicalId":34474,"journal":{"name":"Future Foods","volume":null,"pages":null},"PeriodicalIF":7.2000,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S266683352400145X/pdfft?md5=213001bc7d1eabdc758aadbbfa0c119f&pid=1-s2.0-S266683352400145X-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Structural characterization and immune-enhancing properties of an acidic heteroglycan from Protaetia brevitarsis seulensis larvae\",\"authors\":\"\",\"doi\":\"10.1016/j.fufo.2024.100439\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Edible insects are a promising source of bioactive compounds with diverse health benefits. This study investigated the immunomodulatory properties of polysaccharides isolated from <em>Protaetia brevitarsis seulensis</em> larvae (PBSL). Polysaccharides were fractionated using a molecular weight cutoff membrane, and among these fractions, the higher molecular weight fraction (H-PBSL, 666.84 kDa) demonstrated significant immunomodulatory activity. Methylation and NMR structural analyses revealed H-PBSL to be an acidic heteroglycan with a complex structure, consisting of a backbone of repeating (1→4)-linked α-glucan units highly branched at <em>O</em>-6 positions with T-α-Glc<em>p</em>, T-α-Glc<em>p</em>A, and T-β-Gal<em>p</em>. The immunomodulatory effects of H-PBSL were evaluated using RAW264.7 macrophage cells. H-PBSL treatment enhanced phagocytic activity and increased the expression of immune modulators and macrophage activation surface molecules. In addition, H-PBSL activated the NF-κB signaling pathway, evidenced by increased phosphorylation of IκB and NF-κB, and translocation of NF-κB from cytosol to nucleus. Moreover, inhibition of Toll-like receptor 4 (TLR4) reduced H-PBSL-induced nitric oxide synthesis, indicating TLR4′s pivotal role in H-PBSL-mediated macrophage activation. These findings highlight the potential of H-PBSL as a novel immunomodulatory agent derived from an edible insect, with possible applications in functional foods and nutraceuticals.</p></div>\",\"PeriodicalId\":34474,\"journal\":{\"name\":\"Future Foods\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":7.2000,\"publicationDate\":\"2024-08-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"https://www.sciencedirect.com/science/article/pii/S266683352400145X/pdfft?md5=213001bc7d1eabdc758aadbbfa0c119f&pid=1-s2.0-S266683352400145X-main.pdf\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Future Foods\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S266683352400145X\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"FOOD SCIENCE & TECHNOLOGY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Future Foods","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S266683352400145X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"FOOD SCIENCE & TECHNOLOGY","Score":null,"Total":0}
Structural characterization and immune-enhancing properties of an acidic heteroglycan from Protaetia brevitarsis seulensis larvae
Edible insects are a promising source of bioactive compounds with diverse health benefits. This study investigated the immunomodulatory properties of polysaccharides isolated from Protaetia brevitarsis seulensis larvae (PBSL). Polysaccharides were fractionated using a molecular weight cutoff membrane, and among these fractions, the higher molecular weight fraction (H-PBSL, 666.84 kDa) demonstrated significant immunomodulatory activity. Methylation and NMR structural analyses revealed H-PBSL to be an acidic heteroglycan with a complex structure, consisting of a backbone of repeating (1→4)-linked α-glucan units highly branched at O-6 positions with T-α-Glcp, T-α-GlcpA, and T-β-Galp. The immunomodulatory effects of H-PBSL were evaluated using RAW264.7 macrophage cells. H-PBSL treatment enhanced phagocytic activity and increased the expression of immune modulators and macrophage activation surface molecules. In addition, H-PBSL activated the NF-κB signaling pathway, evidenced by increased phosphorylation of IκB and NF-κB, and translocation of NF-κB from cytosol to nucleus. Moreover, inhibition of Toll-like receptor 4 (TLR4) reduced H-PBSL-induced nitric oxide synthesis, indicating TLR4′s pivotal role in H-PBSL-mediated macrophage activation. These findings highlight the potential of H-PBSL as a novel immunomodulatory agent derived from an edible insect, with possible applications in functional foods and nutraceuticals.