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Carbohydr Res. 2019 May 15;478:58-67. doi: 10.1016/j.carres.2019.04.007. Epub 2019 Apr 26.

Synthesis and characterization of α-d-Galp-(1 → 3)-β-d-Galp epitope-containing neoglycoconjugates for chagas disease serodiagnosis.

Author information

1
Universidad de Buenos Aires. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Hidratos de Carbono (CIHIDECAR). Facultad de Ciencias Exactas y Naturales. Departamento de Química Orgánica, Buenos Aires, Argentina.
2
Instituto de Investigaciones Biotecnológicas "Dr R. Ugalde", IIBIO, Universidad Nacional de San Martín (UNSAM) and CONICET, Buenos Aires, Argentina.
3
Universidad de Buenos Aires. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones en Hidratos de Carbono (CIHIDECAR). Facultad de Ciencias Exactas y Naturales. Departamento de Química Orgánica, Buenos Aires, Argentina. Electronic address: cmarino@qo.fcen.uba.ar.

Abstract

The immunodominant epitope α-d-Galp-(1 → 3)-β-d-Galp-(1 → 4)-d-GlcNAc, expressed in the mucins of the infective trypomastigote stage of Trypanosoma cruzi has been proposed for multiple clinical applications, from serodiagnosis of protozoan caused diseases to xenotransplantation or cancer vaccinology. It was previously shown that the analogue trisaccharide, with glucose in the reducing end instead of GlcNAc, was as efficient as the natural trisaccharide for recognition of chagasic antibodies. Here we describe the synthesis of α-d-Galp-(1 → 3)-β-d-Galp-(1 → 4)-d-Glcp functionalized as the 6-aminohexyl glycoside and its conjugation to BSA using the squarate method. The conjugate of 6-aminohexyl α-d-Galp-(1 → 3)-β-d-Galp was also prepared. Both neoglycoconjugates were recognized by serum samples of Trypanosoma cruzi-infected individuals and thus, are promising tools for the improvement of Chagas disease diagnostic applications.

KEYWORDS:

Anti α-Gal; Neoglycoconjugate; Squarate conjugation method; Trypanosoma cruzi

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