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. 1985 Nov;56(2):356–364. doi: 10.1128/jvi.56.2.356-364.1985

Effect of neuraminidase treatment of cells and effect of soluble glycoproteins on type 3 reovirus attachment to murine L cells.

J R Gentsch, A F Pacitti
PMCID: PMC252582  PMID: 4057353

Abstract

The effect of pretreatment of murine L cells with bacterial neuraminidases on type 3 reovirus attachment was examined. We observed that such treatments resulted in a 60 to 80% decrease of subsequent attachment of 35S-labeled type 3 reovirus in a time- and dose-dependent manner. This result was specific for removal of cell surface sialic acid residues since the specific neuraminidase inhibitor 2-deoxy-2,3-dehydro-n-acetyl neuraminic acid completely prevented the observed effect. Although the total amount of radiolabeled virus bound to neuraminidase-treated cells was greatly reduced, unlabeled reovirus competed only slightly less efficiently for the attachment of 35S-labeled reovirus to neuraminidase-treated versus mock-treated L cells, suggesting that the specificity of the virus interaction with cellular receptor sites was only slightly diminished. Saturation experiments with mock-treated cells or with cells treated with Vibrio cholerae or with V. cholerae plus Arthrobacter ureafaciens neuraminidases indicated that the number of specific cellular receptor sites for type 3 reovirus were reduced by about 47%. We determined that under the neuraminidase digestion conditions used in this experiment we were able to remove a maximum 75% of the total N-acetylneuraminic acid of L cells. Our results also demonstrated that glycoproteins bearing a large amount of sialic acid containing oligosaccharides as well as purified N-acetylneuraminic acid, N-glycolylneuraminic acid, and N-acetylneuraminyl lactose were inhibitors of attachment, while proteins containing no sialic acid or negligible amounts of sialic acid did not inhibit attachment. High concentrations of various monosaccharides and lactose had no effect on reovirus attachment, in agreement with the recent results of Armstrong and his collaborators (Armstrong et al., Virology, 138:37-48, 1984). These data are also supported by the observation that gangliosides are inhibitors of viral attachment (Armstrong et al., Virology, 138:37-48, 1984). Taken together, our results suggest that cell surface sialic acid-containing glycoconjugates are involved in type 3 reovirus binding to murine L cells.

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Selected References

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