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Synthesis of bodipy-labeled bacterial polysaccharides and their interaction with human dendritic cells

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Abstract

In this report, we describe the fluorescent labeling of bacterial polysaccharides (Escherichia coli O86:B7, Escherichia coli O19ab, Pseudomonas aeruginosa O10a10b, and Shigella flexneri 2b) at the “natural” amino group of their phosphoethanolamine moiety. Two protocols for labeling are compared: 1) on a scale of a few mg of the polysaccharide, with a dialysis procedure for purification from excessive reagents; and 2) on a scale of 0.1 mg of the polysaccharide, with a simple precipitation procedure instead of dialysis. The microscale version is sufficient for comfortable cytofluorometric analysis. The resulting probes were found to specifically bind to human dendritic cells in a dose-dependent manner. The used limited set of polysaccharides did not allow us even to get close to understanding which dendritic cell-associated lectins and which cognate polysaccharide epitopes are involved in recognition, but the proposed microscale protocol allows to generate a library of fluorescent probes for further mapping of the polysaccharide specificity of the dendritic cells.

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Abbreviations

BSA:

Bovine serum albumin

DC:

Dendritic cell

DMSO:

Dimethylsulfoxide

LPS:

Lipopolysaccharide

PBS:

Phosphate buffer saline

PBA:

PBS containing 0.2% BSA

PS:

Polysaccharide

Su:

Succinimide

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Acknowledgments

This work was generously supported by grant 20-63-47110 of theRussian Science Foundation, and in part by grant 16-04-01084 of the Russian Foundation for Basic Research.

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Correspondence to Nicolai V. Bovin.

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Tuzikov, A.B., Rapoport, E.M., Khaidukov, S.V. et al. Synthesis of bodipy-labeled bacterial polysaccharides and their interaction with human dendritic cells. Glycoconj J 38, 369–374 (2021). https://doi.org/10.1007/s10719-021-09993-9

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