Preparation and property of a biantenna macromolecule based on polysialic acid.

Abstract:

:Polysialic acid (PSA), an acidic polysaccharide usually exists as a double-chain structure on cell adhesion molecules in vertebrates. The available PSA produced from Escherichia coli fermentation, however, is monochain PSA. In this work, a biomimetic biantenna type PSA (biPSA) was synthesized in vitro under mild conditions, and the terminal nonreducing ends of sialic acid residue were retained. The structure of biPSA was characterized through infrared spectroscopy, and NMR, and the double-chain structure of biPSA was confirmed by the doubled molecular weight and particle size of biPSA. Analysis through circular dichroism, isothermal titration calorimetry, and thermostability experiments revealed that the obtained biPSA was more stable in aqueous solution than PSA, especially after complexation with Ca2+, which increased the variation in enthalpy and entropy. However, the addition of Cu2+ had a negligible effect on configuration of PSA and biPSA. The addition of Ca2+ promoted cell proliferation in a culture of microglia BV-2 cells with biPSA in medium. By contrast, the addition of Cu2+ had toxic effects. Supplementation with biPSA can maintain cell viability for a longer period than supplementation with monochain PSA. This work indicates that biPSA is a potential substitute for monochain PSA in practical applications.

journal_name

Int J Biol Macromol

authors

Lei Y,Wu M,Wang J,Zhang H,Zhan X,Sun Z,Wu J

doi

10.1016/j.ijbiomac.2019.11.107

subject

Has Abstract

pub_date

2020-07-15 00:00:00

pages

1342-1349

eissn

0141-8130

issn

1879-0003

pii

S0141-8130(19)36548-1

journal_volume

155

pub_type

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