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CUTTING EDGE |

*
Pediatric Virology and Sealy Center for Vaccine Development, University of Texas Medical Branch, Galveston, TX 77555; and
Department of Microbiology, University of Western Australia, Queen Elizabeth II Medical Centre, Nedlands, Australia
| Abstract |
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| Introduction |
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| Materials and Methods |
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HSV-1, strain SC16 (3), was used throughout. The zosteriform model is described elsewhere (2). Briefly, mice are infected with 5 x 105 PFU by scarification. Experiments were approved by the Institutional Review Board.
Intra-NKC recombinant mice and speed congenics
Mice used included intra-NKC recombinant mice created previously
(4), with the aid of known microsatellite markers for the
distal arm of chromosome 6 (Fig. 1
). The
B6.BALB-Cmv1s and the B6.BALB-TC1
(Rhs1r) strains were produced using a
speed congenic approach, as described (4).
In vivo depletion of NK cells
Intraperitoneal injections of 100 µg of mAb PK136 (5), against the B6 NK cell surface product of Ly55c, were given every other day, commencing 2 days before infection.
Virus load and LD50 determinations
Virus titers in homogenized sensory nerve ganglia were measured as described previously (2). LD50 was determined by the method of Reed and Muench (6), following i.p. injection (100 µl) with 10-fold dilutions of virus suspension.
Detection of latently infected neurons
The proportion of neurons expressing HSV latency associated transcripts (LATs) was determined by in situ hybridization, using a digoxigenin-labeled riboprobe as described elsewhere (7).
| Results |
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The genetic basis for retardation of zosteriform spread of HSV by
B6 mice (compared with BALB/c) was used as a clinical correlate of
delayed onset of ganglionic infection. The phenotype of delayed
zosteriform rash was defined by absence of a zosteriform skin lesion 5
days after inoculation on the upper flank. F1,
F2, and F2 back-cross
analysis indicated that retardation of zosteriform spread is a dominant
trait controlled by multiple genes (Table I
), supporting prior data using B6 and
A/J parental strains. Our observations highlight the difficulties of
studying genetic resistance to a complex multisystem disease and
greatly increase the complexity of further analysis.
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We tested the ability of the congenic mice to retard zosteriform spread of HSV. Five days after flank inoculation, 11/11 BALB/c mice had zosteriform rashes compared with only 2/9 BALB.B6.Cmv1r (p < 0.01). From these data we concluded that the region of chromosome 6 transferred from B6 to BALB/c mice in the congenic strain is responsible for a substantial part of the ability of B6 mice to retard zosteriform spread.
BALB.B6.Cmv1r mice are resistant to lethal HSV challenge
Congenic mice were next used to study the effect of NK-linked genes on the potentially lethal encephalitis following i.p. inoculation of HSV-1 (1). The previously established difference of >1000-fold between B6 and BALB/c animals (1) was manifest early after infection such that, 7 days after inoculation, B6 and BALB.B6 congenic mice were found to survive a challenge with >107 PFU, in contrast with BALB/c, which had an LD50 of <104. Hence, resistance to lethal HSV challenge is encoded primarily by the B6 region transferred to BALB/c during construction of the congenic strain. According to convention, we have provisionally named the locus responsible for resistance Rhs1 and the B6 allele of the responsible gene Rhs1r.
Mapping of Rhs1
To determine the location of Rhs1, HSV
LD50 values were determined for a B6 background
strain, BALB.B6.Cmv1s, and a series of B6
and BALB/c background intra-NKC recombinant mice (Ref. 4 ,
Table II
). BALB.B6.TC1 and
BALB.B6.Cmv1s were both resistant to HSV
(LD50 > 107), whereas
BALB.B6.CT13 were susceptible (LD50 <<
104), which clearly distinguishes Rhs1
from Cmv1. A full strain distribution pattern of HSV
resistance in the intra-NKC recombinant strains showed BALB/c-like
susceptibility in BALB.B6.CT13 and .CT11 that, together with B6-like
resistance of BALB.B6.Cmv1r, places
Rhs1 between Ly55a (mNkrp1a) and
D6Mit108.
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Resistance was assessed by virus load in ganglia of groups of nine
mice 5 days after flank inoculation (Fig. 2
). Significantly less HSV was recovered
from B6 (1.5 x 104 PFU) than from BALB/c
mice (3 x 105 PFU). Virus load in
Cmv1r congenic mice (1.9 x
104 PFU) was similar to B6
(p < 0.01, ANOVA, Tukeys procedure). In
contrast with spinal ganglia, no consistent difference in viral loads
was detected in skin at the site of inoculation (not shown), leading us
to conclude that NKC-linked resistance is active primarily at the level
of the PNS.
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BALB.B6.Cmv1r mice were next used to
determine whether the effect of Rhs1 might be mediated by
NK1.1+ (NK or NK/T) cells. We compared virus
loads in ganglia of 10 BALB.B6.Cmv1r and
BALB/c (Rhs1s) mice, either with or
without treatment with a mAb (PK136) against the product of the B6
allele of Ly55 (NK1.1; Fig. 1
), a molecule expressed
exclusively by NK and NK/T cells. Four days after inoculation, mean
virus recovery from untreated
BALB.B6.Cmv1r mice was 3 x
102 PFU, whereas PK136 treatment (5)
increased mean virus load in congenic animals (2 x
103 PFU) to the same level as BALB/c controls
(2 x 103 PFU) (Fig. 3
; p < 0.01, ANOVA,
Tukeys procedure). In contrast, treatment of BALB/c animals with
PK136 had no effect. These data strongly implicate NK or NK/T cells as
mediators of the effects of
Rhs1r.
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After recovery from primary infection, HSV DNA persists in a
proportion of neurons in a latent state, forming a reservoir of
infection that can periodically reactivate. A limited region of the
viral genome is transcribed in latently infected neurons
(15). The LATs are retained in neuronal nuclei, providing
a means of quantifying sites of latency in situ. To determine whether
Rhs1 influences the magnitude of latent infection,
LAT+ neurons were quantified by in situ
hybridization (7) in ganglia of BALB/c and congenic
BALB.B6.Cmv1r/Rhs1r
mice 1 mo after flank inoculation. The proportion of
LAT+ neurons was five times greater in
Rhs1r mice than BALB/c (Fig. 4
), indicating that rapid innate
suppression of productive infection in the PNS encourages the
establishment of latency.
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| Discussion |
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cannot be excluded because
NK cells can produce this molecule. We speculate that NK or NK/T cells
recognize HSV-infected neurons before expression of productive cycle
genes and deliver a signal that inhibits initiation of virus
replication. Type 1 IFNs, which can be made by NK and NK/T cells, have
been linked with HSV innate resistance (13), raising the
possibility that Rhs1 could be a previously unrecognized IFN
regulatory locus. Interestingly, an immediate early gene product of HSV
has the capacity to shut off cell surface expression of class I MHC
molecules in infected cells (17), perhaps hindering their
immunologic destruction and allowing their recognition by IFN-producing
NK cells. In addition, HSV can up-regulate class I MHC expression in
neighboring uninfected neurons (18), potentially enabling
rapid presentation of virion structural proteins at the cell surface
for perusal by cells bearing TCRs (T or NK/T cells) before the onset of
viral gene expression.
In summary, a genetic locus,
Rhs1r, was responsible for
minimizing the magnitude of productive HSV infection in the sensory
nervous system. A consequence of Rhs1r
activity was increased establishment of neuronal latency. To our
knowledge, this is the first description of a genetic locus influencing
the magnitude of latent infection with any virus. The data predict the
location of a human locus syntenic with Rhs1, on human
chromosome 12 (Fig. 1
c). Finally, we have established an
important role for NK or NK/T cells in the nervous system. Their role
in controlling HSV infection in sensory ganglia of Rhs1
congenic mice strongly suggests that the effects of Rhs1 are
mediated by one or both of these cell types.
| Footnotes |
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2 Address correspondence and reprint requests to Dr. Anthony Simmons, Department of Pediatrics, University of Texas Medical Branch, 301 University Boulevard, Galveston, TX 77555-0373. ![]()
3 Abbreviations used in this paper: PNS, peripheral nervous system; NKC, NK complex; LAT, latency associated transcripts. ![]()
Received for publication February 21, 2001. Accepted for publication March 26, 2001.
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gene mRNA is prominent in latently infected neurons. Science 235:1056.This article has been cited by other articles:
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