PuSH - Publication Server of Helmholtz Zentrum München: Expression of raf kinase inhibitor protein is down regulated in response to newcastle disease virus infection to promote viral replication.

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Yin, R.* ; Liu, X.* ; Bi, Y.* ; Xie, G.* ; Zhang, P.* ; Meng, X.* ; Ai, L.* ; Xu, R.* ; Sun, Y.* ; Stöger, T. ; Ding, Z.*

Expression of raf kinase inhibitor protein is down regulated in response to newcastle disease virus infection to promote viral replication.

J. Gen. Virol. 96, 2579-2586 (2015)

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Newcastle disease virus (NDV) causes a severe and economically significant disease affecting almost the entire poultry industry worldwide. However, factors that affect NDV replication in host cells are poorly understood. Raf kinase inhibitory protein (RKIP) is a physiological inhibitor of c-RAF kinase and NF-kB signalling, known for their functions in the control of immune response as well as tumour invasion and metastasis. In the present study, we investigated the consequences of overexpression of host RKIP during viral infection. We demonstrate that NDV infection represses RKIP expression thereby promoting virus replication. Experimental upregulation of RKIP in turn acts as a potential antiviral defence mechanism in host cells that restricts NDV replication by repressing the activation of Raf/MEK/ERK and IkBα/NF-kB signalling pathways. Our results not only extend the concept of linking NDV–host interactions, but also reveal RKIP as a new class of protein-kinase-inhibitor protein that affects NDV replication with therapeutic potential.

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