Publication
Title
Sialoadhesin and CD163 join forces during entry of the porcine reproductive and respiratory syndrome virus
Author
Abstract
The porcine reproductive and respiratory syndrome virus (PRRSV) shows a restricted tropism for subsets of porcine macrophages in vivo. To date, two PRRSV receptors have been identified on primary macrophages, heparan sulphate for binding and sialoadhesin for binding and internalization. However, additional factors are needed because the expression of both receptors in non-permissive cells results in virus internalization but not in virus uncoating and productive infection. Recently, CD163 was described as a PRRSV receptor on Marc-145 cells that renders non-permissive cells susceptible to PRRSV. Therefore, the potential role of CD163 in PRRSV entry in macrophages and its potential interplay with sialoadhesin were studied. Incubation of macrophages; at 37 degrees C with either sialoadhesin- or CD163-specific antibodies reduced PRRSV infection by up to 75%, while infection was completely blocked by a combination of both antibodies. When incubated at 4 degrees C, only sialoadhesin- and not CD163-specific antibodies reduced PRRSV infection. In addition, confocal analysis of PRRSV entry in non-permissive cells expressing only sialoadhesin showed PRRSV internalization but no uncoating. In contrast, when both sialoadhesin and CD163 were expressed, PRRSV was uncoated upon internalization, resulting in productive infection. Virus internalization was not observed when only CD163 was expressed; although, cells became productively infected. Thus, sialoadhesin is confirmed as a PRRSV internalization receptor and CD163 is shown to be involved in PRRSV entry, probably during uncoating. Co-expression of recombinant sialoadhesin and CD163 in non-permissive cells increased virus production 10-100 times compared with cells expressing only CD163, sustaining the requirement of both for efficient PRRSV infection.
Language
English
Source (journal)
Journal of general virology. - London
Publication
London : 2008
ISSN
0022-1317
Volume/pages
89(2008), p. 2943-2953
ISI
000261527800003
Full text (Publishers DOI)
Full text (open access)
UAntwerpen
Faculty/Department
Publication type
Subject
External links
Web of Science
Record
Identification
Creation 16.01.2015
Last edited 22.05.2017