Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 418165
Title MDCK cell line with inducible allele B NS1 expression propagates deINS1 inflenza virus to high titres
Author(s) Wielink, R. van; Harmsen, M.M.; Martens, D.E.; Peeters, B.P.H.; Wijffels, R.H.; Moormann, R.J.M.
Source Vaccine 29 (2011)40. - ISSN 0264-410X - p. 6976 - 6985.
DOI http://dx.doi.org/10.1016/j.vaccine.2011.07.037
Department(s) Bioprocess Engineering
CVI Virology
Publication type Refereed Article in a scientific journal
Publication year 2011
Keyword(s) protein induces apoptosis - airway epithelial-cells - a virus - gene-expression - infected-cells - interferon - vaccine - rna - systems - ability
Abstract Influenza A viruses lacking the gene encoding the non-structural NS1 protein (delNS1) have potential use as live attenuated vaccines. However, due to the lack of NS1, virus replication in cell culture is considerably reduced, prohibiting commercial vaccine production. We therefore established two stable MDCK cell lines that show inducible expression of the allele B NS1 protein. Upon induction, both cell lines expressed NS1 to about 1000-fold lower levels than influenza virus-infected cells. Nevertheless, expression of NS1 increased delNS1 virus titres to levels comparable to those obtained with an isogenic virus strain containing an intact NS1 gene. Recombinant NS1 expression increased the infectious virus titres 244 to 544-fold and inhibited virus induced apoptosis. However, NS1 expression resulted in only slightly, statistically not significant, reduced levels of interferon-ß production. Thus, the low amount of recombinant NS1 is sufficient to restore delNS1 virus replication in MDCK cells, but it remains unclear whether this occurs in an interferon dependent manner. In contrast to previous findings, recombinant NS1 expression did not induce apoptosis, nor did it affect cell growth. These cell lines thus show potential to improve the yield of delNS1 virus for vaccine production.
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