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Journal of Virology, October 2003, p. 10537-10547, Vol. 77, No. 19
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.19.10537-10547.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Glycoprotein of Nonpathogenic Rabies Viruses Is a Key Determinant of Human Cell Apoptosis

Christophe Préhaud,1 Stéphanie Lay,1 Bernhard Dietzschold,2 and Monique Lafon1*

Unité de Neuroimmunologie Virale, Département de Neuroscience, Institut Pasteur, Paris, France,1 Center for Neurology, Department of Microbiology and Immunology, Thomas Jefferson University, Philadelphia, Pennsylvania2

Received 7 February 2003/ Accepted 20 June 2003

We showed that, unlike pathogenic rabies virus (RV) strain CVS, attenuated RV strain ERA triggers the caspase-dependent apoptosis of human cells. Furthermore, we observed that the induction of apoptosis is correlated with a particular virus antigen distribution: the overexpression of the viral G protein on the cell surface, with continuous localization on the cytoplasmic membrane, and large cytoplasmic inclusions of the N protein. To determine whether one of these two major RV proteins (G and N proteins) triggers apoptosis, we constructed transgenic Jurkat T-cell lines that drive tetracycline-inducible gene expression to produce the G and N proteins of ERA and CVS individually. The induction of ERA G protein (G-ERA) expression but not of ERA N protein expression resulted in apoptosis, and G-ERA was more efficient at triggering apoptosis than was CVS G protein. To test whether other viral proteins participated in the induction of apoptosis, human cells were infected with recombinant RV in which the G protein gene from the attenuated strain had been replaced by its virulent strain counterpart (CVS). Only RV containing the G protein from the nonpathogenic RV strain was able to trigger the apoptosis of human cells. Thus, the ability of RV strains to induce apoptosis is largely determined by the viral G protein.

* Corresponding author. Mailing address: Institut Pasteur, Unité de Neuroimmunologie Virale, 25 Rue du Dr. Roux, 75724 Paris Cedex 15, France. Phone: 33-1-45-68-87-52. Fax: 33-1-40-61-33-12. E-mail: mlafon{at}pasteur.fr.

Journal of Virology, October 2003, p. 10537-10547, Vol. 77, No. 19
0022-538X/03/$08.00+0     DOI: 10.1128/JVI.77.19.10537-10547.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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