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Recombinant lentogenic Newcastle disease virus expressing Ebola virus GP infects cells independently of exogenous trypsin and uses macropinocytosis as the major pathway for cell entry

Zhiyuan Wen, Bolin Zhao, Kun Song, Xule Hu, Weiye Chen, Dongni Kong, Jinying Ge and Zhigao Bu*

  • * Corresponding author: Zhigao Bu zgbu@yahoo.com

  • † Equal contributors

Author Affiliations

State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 427 Maduan Street, Harbin 150001, People’s Republic of China

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Virology Journal 2013, 10:331  doi:10.1186/1743-422X-10-331

Published: 9 November 2013

Abstract

Background

Using reverse genetics, we generated a recombinant low-pathogenic LaSota strain Newcastle disease virus (NDV) expressing the glycoprotein (GP) of Ebola virus (EBOV), designated rLa-EBOVGP, and evaluated its biological characteristic in vivo and in vitro.

Results

The introduction and expression of the EBOV GP gene did not increase the virulence of the NDV vector in poultry or mice. EBOV GP was incorporated into the particle of the vector virus and the recombinant virus rLa-EBOVGP infected cells and spread within them independently of exogenous trypsin. rLa-EBOVGP is more resistant to NDV antiserum than the vector NDV and is moderately sensitive to EBOV GP antiserum. More importantly, infection with rLa-EBOVGP was markedly inhibited by IPA3, indicating that rLa-EBOVGP uses macropinocytosis as the major internalization pathway for cell entry.

Conclusions

The results demonstrate that EBOV GP in recombinant NDV particles functions independently to mediate the viral infection of the host cells and alters the cell-entry pathway.

Keywords:
Recombinant Newcastle disease virus; Ebola virus; Glycoprotein; Virus entry; Macropinocytosis