Oligosaccharide-derivatized dendrimers: Defined multivalent inhibitors of the adherence of the cholera toxin B subunit and the heat labile enterotoxin of E. coli to GM1

Jeffrey P. Thompson, Cara Lynne Schengrund

Research output: Contribution to journalArticlepeer-review

64 Scopus citations

Abstract

Poly(propylene imine) dendrimers having four or eight primary amino groups and a Starburst(TM) (PAMAM) dendrimer having eight primary amino groups were used as core molecules, to which phenylisothiocyanate derivatized (PITC) galβ1-3galNAcβ1-4[sialic acid α2-3]-galβ1-4glc (oligo-GM1) residues were covalently attached to yield multivalent oligosaccharides. The synthesis of the oligo-GM1-PITC derivatized dendrimers was monitored using high performance thin layer chromatography, infrared spectroscopy, sialic acid content, and mass spectroscopy. The ability of multivalent oligo-GM1-PITC dendrimers to inhibit the binding of 125I-labeled cholera toxin a subunit and the heat labile enterotoxin of E. coli to GM1-coated microtiter wells was determined. IC50s obtained for the oligo-GM1-PITC dendrimers, GM1, and the oligosaccharide moiety of GM1 indicated that the derivatized dendrimers inhibited binding of the choleragenoid and the heat labile enterotoxin to GM1-coated wells at a molar concentration five- to 15-fold lower than native GM1 and more than 1,000-fold lower than that of the free oligosaccharide.

Original languageEnglish (US)
Pages (from-to)837-845
Number of pages9
JournalGlycoconjugate Journal
Volume14
Issue number7
DOIs
StatePublished - Jan 1 1997

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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