Synthesis of a biotinylated analog of the carbohydrate portion of a glycosphingolipid from the parasite Echinococcus multilocularis has been achieved. We synthesized β-D-Galp-(1→6)-β-D-Galp-(1→6)-[α-L-Fucp-(1→3)]-β-D-Galp-(1→R: biotin probe) (1) and compared the antigenicity by an enzyme linked immunosorbent assay (ELISA) with biotinylated trisaccharide α-D-Galp-(1→4)-β-D-Galp-(1→3)-α-D-Galp-(1→R: biotin probe) (F), which has been shown to have significant antigenicity. Both of the oligosaccharides reacted with sera of alveolar echinococcosis (AE) patients, but showed different reactivity. Among the 60 sera of AE patients, more sera reacted with the linear sequence Galα1→4Galβ1→3GalNAcα1→R of oligosaccharide (F) than for branched compound 1. Some sera showed high specificity to one of the compound, indicating that the antibodies in the sera of AE patients differ in their specificity to recognize carbohydrate sequences of glycosphingolipids. Our results demonstrate that both of the biotinylated oligosaccharides 1 and F have good serodiagnostic potential and are complementary to detect infections caused by the parasite Echinococcus multilocularis.
我们成功合成了一种
生物素化的类似物,这种类似物来自多角棘球蚴寄生虫的一种糖鞘脂的
碳水化合物部分。We synthesized β-D-Galp-(1→6)-β-D-Galp-(1→6)-[α-L-Fucp-(1→3)]-β-D-Galp-(1→R:1),并通过酶联免疫吸附试验(ELI
SA)与
生物素化的α-D-Galp-(1→4)-β-D-Galp-(1→3)-α-D-Galp-(1→R:
生物素探针)三糖(F)比较其抗原性,后者已被证明具有显著的抗原性。这两种
寡糖都能与肺泡棘球蚴病(AE)患者的血清发生反应,但表现出不同的反应性。在60份AE患者血清中,与
寡糖(F)的线性序列Galα1→4Galβ1→3GalNAcα1→R相比,更多的血清与支链化合物1发生反应。 一些血清对其中一种化合物表现出高度特异性,这表明AE患者血清中的
抗体识别糖
磷脂碳水化合物序列的特异性不同。我们的研究结果表明,
生物素化
寡糖 1 和 F 都具有良好的血清诊断潜力,在检测由多棘球蚴寄生虫引起的感染方面具有互补性。