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Structural characterization and immune enhancement activity of a novel polysaccharide from Moringa oleifera leaves.
Carbohydrate Polymers ( IF 10.7 ) Pub Date : 2020-01-27 , DOI: 10.1016/j.carbpol.2020.115897
Chao Li 1 , Zhuping Dong 2 , Bin Zhang 1 , Qiang Huang 1 , Guang Liu 3 , Xiong Fu 1
Affiliation  

A novel polysaccharide, designated as MOP-3, was extracted and isolated from the leaves of Moringa oleifera. Structural characterization showed that MOP-3 had a molecular weight (MW) of 4.033 × 106 Da and was composed of arabinose, glucose and galactose with a molar ratio of 47.73:1.00:57.65. Methylation and nuclear magnetic resonance (NMR) analysis revealed that the main glycosidic linkage types of MOP-3 were (1→3,6)-β-D-Galp, (1→6)-β-D-Galp, (1→5)-α-L-Araf, and T-α-L-Araf. MOP-3 containing no lipopolysaccharides showed no direct cytotoxicity to the macrophage RAW 264.7 cells within the tested concentrations. The immunomodulatory assay suggested that MOP-3 could significantly enhance pinocytic capacity and increase the secretion of reactive oxygen species (ROS), nitric oxide (NO), interleukin-6 (IL-6), and tumor necrosis factor-α (TNF-α) by up-regulating the corresponding mRNA expression levels in RAW 264.7 cells. Our findings demonstrated that MOP-3 could potentially be used as a functional food for the hypoimmunity therapies.

中文翻译:

一种来自辣木叶的新型多糖的结构表征和免疫增强活性。

从辣木的叶子中提取并分离出一种称为MOP-3的新型多糖。结构表征表明,MOP-3的分子量(MW)为4.033×106 Da,由阿拉伯糖,葡萄糖和半乳糖组成,摩尔比为47.73:1.00:57.65。甲基化和核磁共振(NMR)分析显示,MOP-3的主要糖苷键类型为(1→3,6)-β-D-Galp,(1→6)-β-D-Galp,(1→ 5)-α-L-Araf和T-α-L-Araf。在测试浓度下,不含脂多糖的MOP-3对巨噬细胞RAW 264.7细胞没有直接的细胞毒性。免疫调节试验表明,MOP-3可以显着增强胞吞能力,并增加活性氧(ROS),一氧化氮(NO),白介素6(IL-6),通过上调RAW 264.7细胞中相应的mRNA表达水平来调节肿瘤坏死因子-α(TNF-α)的表达。我们的研究结果表明,MOP-3可以潜在地用作免疫功能低下疗法的功能性食品。
更新日期:2020-01-27
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