Abstract
In this work, we showed that cell death induced by a recombinant (vAcNSs) Autographa californica multiple nucleopolyhedrovirus (AcMNPV) expressing the silencing suppressor (NSs) protein of Tomato spotted wilt virus (TSWV) was enhanced on permissive and semipermissive cell lines. The expression of a heterologous gene (firefly luciferase) during co-infection of insect cells with vAcNSs and a second recombinant baculovirus (vAgppolhfluc) was shown to increase when compared to single vAgppolhfluc infections. Furthermore, the vAcNSs mean time-to-death values were significantly lower than those for wild-type AcMNPV on larvae of Spodoptera frugiperda and Anticarsia gemmatalis. These results showed that the TSWV-NSs protein could efficiently increase heterologous protein expression in insect cells as well as baculovirus pathogenicity and virulence, probably by suppressing the gene-silencing machinery in insects.
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Acknowledgments
This work was supported by the Postdoctoral National Program (PNPD) and the University of Brasília, Graduate Program in Molecular Biology. It was financed by CAPES (Coordenacão de Aperfeiçoamento de Pessoal de Nível Superior) CNPq (Conselho Nacional de Desenvolvimento Científico e Tecnológico) and FAPDF (Fundação de Apoio à Pesquisa do Distrito Federal). We would like to thank Dra. Maria Elita Batista de Castro, Embrapa Recursos Genéticos e Biotecnologia-CENARGEN, Brasília-DF, for providing the A. gemmatalis and S. frugiperda larvae.
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de Oliveira, V.C., da Silva Morgado, F., Ardisson-Araújo, D.M.P. et al. The silencing suppressor (NSs) protein of the plant virus Tomato spotted wilt virus enhances heterologous protein expression and baculovirus pathogenicity in cells and lepidopteran insects. Arch Virol 160, 2873–2879 (2015). https://doi.org/10.1007/s00705-015-2580-2
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DOI: https://doi.org/10.1007/s00705-015-2580-2