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Research Article

Envelope glycoprotein gp50 of pseudorabies virus is essential for virus entry but is not required for viral spread in mice.

B Peeters, J Pol, A Gielkens, R Moormann
B Peeters
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J Pol
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A Gielkens
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R Moormann
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ABSTRACT

Phenotypically complemented pseudorabies virus gp50 null mutants are able to produce plaques on noncomplementing cell lines despite the fact that progeny virions are noninfectious. To determine whether gp50 null mutants and gp50+gp63 null mutants are also able to replicate and spread in animals, mice were infected subcutaneously or intraperitoneally. Surprisingly, both gp50 mutants and gp50+gp63 double mutants proved to be lethal for mice. In comparison with the wild-type virus, gp50 mutants were still highly virulent, whereas the virulence of gp50+gp63 mutants was significantly reduced. Severe signs of neurological disorders, notably pruritus, were apparent in animals infected with the wild-type virus or a gp50 mutant but were much less pronounced in animals infected with a gp50+gp63 or gp63 mutant. Immunohistochemical examination of infected animals showed that all viruses were able to reach, and replicate in, the brain. Examination of visceral organs of intraperitoneally infected animals showed that viral antigen was predominantly present in peripheral nerves, suggesting that the viruses reached the central nervous system by means of retrograde axonal transport. Infectious virus could not be recovered from the brains and organs of animals infected with gp50 or gp50+gp63 mutants, indicating that progeny virions produced in vivo are noninfectious. Virions that lacked gp50 in their envelopes, and a phenotypically complemented pseudorabies virus gII mutant (which is unable to produce plaques in tissue culture cells), proved to be nonvirulent for mice. Together, these results show that gp50 is required for the primary infection but not for subsequent replication and viral spread in vivo. These results furthermore indicate that transsynaptic transport of the virus is independent of gp50. Since progeny virions produced by gp50 mutants are noninfectious, they are unable to spread from one animal to another. Therefore, such mutants may be used for the development of a new generation of safer (carrier) vaccines.

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Envelope glycoprotein gp50 of pseudorabies virus is essential for virus entry but is not required for viral spread in mice.
B Peeters, J Pol, A Gielkens, R Moormann
Journal of Virology Jan 1993, 67 (1) 170-177; DOI:

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Envelope glycoprotein gp50 of pseudorabies virus is essential for virus entry but is not required for viral spread in mice.
B Peeters, J Pol, A Gielkens, R Moormann
Journal of Virology Jan 1993, 67 (1) 170-177; DOI:
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