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J Virol, February 1998, p. 1235-1243, Vol. 72, No. 2
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Virus-Induced Cell Motility

Christopher M. Sanderson,1 Michael Way,2 and Geoffrey L. Smith1,*

Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, United Kingdom,1 and European Molecular Biology Laboratory, Heidelberg D69117, Germany2

Received 11 September 1997/Accepted 4 November 1997

Many viruses induce profound changes in cell metabolism and function. Here we show that vaccinia virus induces two distinct forms of cell movement. Virus-induced cell migration was demonstrated by an in vitro wound healing assay in which infected cells migrated independently into the wound area while uninfected cells remained relatively static. Time-lapse microscopy showed that the maximal rate of migration occurred between 9 and 12 h postinfection. Virus-induced cell migration was inhibited by preinactivation of viral particles with trioxsalen and UV light or by the addition of cycloheximide but not by addition of cytosine arabinoside or rifampin. The expression of early viral genes is therefore necessary and sufficient to induce cell migration. Following migration, infected cells developed projections up to 160 µm in length which had growth-cone-like structures and were frequently branched. Time-lapse video microscopy showed that these projections were formed by extension and condensation of lamellipodia from the cell body. Formation of extensions was dependent on late gene expression but not the production of intracellular enveloped (IEV) particles. The requirements for virus-induced cell migration and for the formation of extensions therefore differ from each other and are distinct from the polymerization of actin tails on IEV particles. These data show that poxviruses encode genes which control different aspects of cell motility and thus represent a useful model system to study and dissect cell movement.

* Corresponding author. Mailing address: Sir William Dunn School of Pathology, University of Oxford, South Parks Rd., Oxford OX1 3RE, United Kingdom. Phone: 44-1865-275521. Fax: 44-1865-275501. E-mail: glsmith{at}molbiol.ox.ac.uk.




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J. Bacteriol. Mol. Cell. Biol. Microbiol. Mol. Biol. Rev.
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Copyright © 1998 by the American Society for Microbiology. All rights reserved.