首页> 外文期刊>Journal of Molecular Biochemistry >Leishmania Donovani Cell Surface Sialoglycans Regulate Susceptibility for Siglec Mediated Macrophage Invasion and Parasite Survival
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Leishmania Donovani Cell Surface Sialoglycans Regulate Susceptibility for Siglec Mediated Macrophage Invasion and Parasite Survival

机译:利什曼原虫Donovani细胞表面唾液聚糖调节Siglec介导巨噬细胞入侵和寄生虫生存的易感性。

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Glycoconjugates play a pivotal role in the survival of Leishmania parasites in destructive surroundings. An important constituent present on many glycoconjugates is sialic acid. By virtue of their peripheral position on oligosaccharide chains of glycoconjugates, sialic acids are well suited as molecular determinants of specific biological processes, including the interaction of pathogenic microorganisms with sialylated cellular receptors. Differences in a2,3- and a2,6-sialoglycan patterns detected in clonal virulent Leishmania donovani promastigotes, correlated with the level of a2,3- and a2,6-sialyltransferase activity present in these parasites. The role of macrophage sialic acid-receptors in uptake and survival of L.donovani was studied in the murine macrophage cell line raw 264.7. Macrophage invasion was dependent on the binding to Siglec-1, while suppression of MAPK signaling was mediated through Siglec-5. Sialic acid removal by neuraminidase treatment reduced parasite infectivity. The presence of trypsin resistant sialic acid residues in the neuraminidase treated parasites grown in a serum free medium in presence of sialoglycoconjugates indicated that the parasites could salvage sialic acid from exogenous sialoglycans and reutilize it for de novo glycoprotein sialylation in L.donovani parasites. Thus, our results demonstrate the involvement of sialoglycans in the invasion as well as the survival process of L.donovani parasites.
机译:糖缀合物在破坏性环境中在利什曼原虫寄生虫的存活中起关键作用。存在于许多糖缀合物上的重要成分是唾液酸。由于唾液酸在糖缀合物的寡糖链上的外围位置,非常适合作为特定生物学过程的分子决定因素,包括病原微生物与唾液酸化细胞受体的相互作用。在无毒力的利什曼原虫多鞭毛体前鞭毛体中检测到的a2,3-和a2,6-唾液酸模式的差异与这些寄生虫中a2,3-和a2,6-唾液酸转移酶活性的水平相关。在鼠巨噬细胞原始264.7细胞系中研究了巨噬细胞唾液酸受体在L.donovani摄取和存活中的作用。巨噬细胞的入侵取决于与Siglec-1的结合,而MAPK信号的抑制则通过Siglec-5介导。通过神经氨酸酶处理去除唾液酸降低了寄生虫的传染性。在无血清培养基中存在唾液酸糖共轭物的情况下生长的神经氨酸酶处理过的寄生虫中存在胰蛋白酶抗性唾液酸残基,这表明该寄生虫可以从外源唾液聚糖中挽救唾液酸,并将其重新用于donovani寄生虫的从头糖蛋白唾液酸化。因此,我们的结果表明唾液聚糖参与了L.donovani寄生虫的侵袭和生存过程。

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