Home Acta Virologica 2016 Acta Virologica Vol.60, No.3, p.290-297, 2016

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ISSN 0001-723X
E-ISSN 1336-2305

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Acta Virologica Vol.60, No.3, p.290-297, 2016

Title: Recombinant beta interferon could clear the low-dose infected porcine reproductive and respiratory syndrome virus (PRRSV) in MARC-145 cells
Author: X. SHI, X. ZHANG, L. WANG, W. LI, B. JIANG, R. DENG, A. WANG, G. ZHANG

Abstract: Porcine reproductive and respiratory syndrome virus (PRRSV) causes one of the most economically devastating and pandemic porcine diseases. Previous study has shown that MARC-145 cells pretreated with recombinant IFN-β (rIFN-β) couldn't develop cytopathic effect (CPE) of PRRSV. However, up to date, it is not clear whether MARC-145 cells post-treated with rIFN-β could develop CPE of PRRSV. The present work showed that the MARC-145 cells didn't develop the CPE at 120 hr post-infection (p.i.) with low-dose of PRRSV when the cells were pre-treated with rIFN-β (Group 1), post-treated with rIFN-β at 4 hr p.i. (Group 2), or post-treated with rIFN-β at 8 hr p.i. (Group 3), while the MARC-145 cells could develop CPE when the cells were infected with high-dose PRRSV and then treated with rIFN-β at 24 hr p.i.. Furthermore, the indirect immunofluorescence assay confirmed that there were a few N protein-positive cells in the high-dose infected cells in Group 1, Group 2 and Group 3, while there were no N protein-positive cells in the low-dose infected cells in all rIFN-β treatment groups. In addition, the numbers of N protein-positive cells in high-dose infected cells (MOI = 10) in Group 1 were lower than that in Group 2 and Group 3. The results above demonstrated that both pre-treatment with rIFN-β and an earlier post-treatment with rIFN-β could inhibit the PRRSV replication and could clear the low-dose infected PRRSV, which indicated that the rIFN-β had efficient antiviral activities when the cells have been infected with PRRSV.

Keywords: PRRSV; recombinant IFN-β
Published online: 13-Sep-2016
Year: 2016, Volume: 60, Issue: 3 Page From: 290, Page To: 297
doi:10.4149/av_2016_03_290


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