Glycosylation is Required for Coronavirus TGEV to Induce an Efficient Production of IFNα by Blood Mononuclear Cells
- 1 April 1991
- journal article
- Published by Wiley in Scandinavian Journal of Immunology
- Vol. 33 (4), 435-440
- https://doi.org/10.1111/j.1365-3083.1991.tb01792.x
Abstract
Porcine peripheral blood mononuclear cells (PBMC) are induced to produce interferon alpha (IFN alpha) following in vitro exposure to coronavirus TGEV (transmissible gastroenteritis virus)-infected glutaraldehyde-fixed cell monolayers or to TGEV virions. In the present report, we examined the possibility that glycosylation of viral proteins could play a major role in interactions with PBMC leading to the production of IFN alpha. Con A pretreatment of TGEV-infected cell monolayers before fixation with glutaraldehyde and exposure to PBMC caused a dose-dependent inhibition of IFN alpha induction, implying that masking of carbohydrates at the surface of infected cells lowered IFN-alpha-induction. Similarly, inhibition of N-linked glycosylation by tunicamycin during viral infection of cell monolayers altered their ability to induce IFN alpha. In addition, complete cleavage of 'complex type' oligosaccharides by peptide-N-glycohydrolase F lowered the capacity of TGEV virions to induce IFN alpha. Thus, these findings strongly suggest that glycosylation of the viral proteins, and more precisely the presence of complex-type oligosaccharides, is an important requirement for a completely efficient interaction with PBMC leading to the production of IFN-alpha.Keywords
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