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J. Virol., 10 1996, 7270-7274, Vol 70, No. 10
JM Hill, JB Maggioncalda, HH Garza Jr, YH Su, NW Fraser and TM Block
A rabbit ocular model of epinephrine-induced herpes simplex virus type 1
reactivation was employed to study the effect of a deletion in the
latency-associated transcript domain. A viral construct derived from
17Syn+, designated 17deltaSty, has a deletion of 370 nucleotides between
genomic positions 118880 and 119250. 17deltaSty has been shown to
reactivate with wild-type virus kinetics from explants of trigeminal
ganglia from latently infected mice. To determine the behavior of this
mutant in an in vivo, inducible reactivation system, rabbit corneas were
infected with 17Syn+, 17deltaSty, or its rescuant, 17detlaSty-Res. After
viral latency was established, transcorneal epinephrine iontophoresis was
performed. The rabbits latently infected with 17deltaSty exhibited a
significantly reduced ability to undergo adrenergically induced
reactivation, i.e., viral shedding in the tears, compared with rabbits
infected with either 17Syn+ or 17deltaSty-Res. However, quantitative PCR
demonstrated similar numbers of viral genomes in the trigeminal ganglia
from rabbits latently infected with all three viruses, and all three
viruses reactivated in vitro with wild-type kinetics in an explant
cocultivation assay. These studies indicate that the 370-bp region deleted
in the 17deltaSty construct plays a role in epinephrine-induced
reactivation.
Copyright © 1996, American Society for Microbiology
In vivo epinephrine reactivation of ocular herpes simplex virus type 1 in the rabbit is correlated to a 370-base-pair region located between the promoter and the 5' end of the 2.0 kilobase latency-associated transcript
LSU Eye Center, Louisiana State University Medical Center School of Medicine, New Orleans, Louisiana 70112-2234, USA.
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