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Journal of Virology, April 2000, p. 3909-3917, Vol. 74, No. 8
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Cell-to-Cell Spread of Wild-Type Herpes Simplex Virus Type 1, but
Not of Syncytial Strains, Is Mediated by the Immunoglobulin-Like
Receptors That Mediate Virion Entry, Nectin1 (PRR1/HveC/HIgR) and
Nectin2 (PRR2/HveB)
Francesca
Cocchi,1
Laura
Menotti,1
Patrice
Dubreuil,2
Marc
Lopez,2 and
Gabriella
Campadelli-Fiume1,*
Department of Experimental Pathology, Section
on Microbiology and Virology, University of Bologna, 40126 Bologna,
Italy,1 and Institute of Cancerology and
Immunology, INSERM U.119, 13009 Marseille,
France2
Received 2 December 1999/Accepted 20 January 2000
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ABSTRACT |
The immunoglobulin-like receptors that mediate entry of herpes
simplex virus type 1 (HSV-1) into human cells were found to mediate the
direct cell-to-cell spread of wild-type virus. The receptors here
designated Nectin1
and -
and Nectin2
were originally designated HIgR, PRR1/HveC, and PRR2
/HveB, respectively. We report the following. (i) Wild-type HSV-1 spreads from cell to cell in J cells
expressing nectin1
or nectin1
but not in parental J cells that
are devoid of entry receptors. A monoclonal antibody to nectin1, which
blocks entry, also blocked cell-to-cell spread in nectin1-expressing J
cells. Moreover, wild-type virus did not spread from a
receptor-positive to a receptor-negative cell. (ii) The antibody to
nectin1 blocked transmission of wild-type virus in a number of human
cell lines, with varying efficiencies, suggesting that nectin1 is the
principal mediator of wild-type virus spread in a variety of human
cell lines. (iii) Nectin1 did not mediate cell fusion induced by the
syncytial strains HSV-1(MP) and HFEM-syn. (iv) Nectin2
could serve
as a receptor for spread of a mutant virus carrying the L25P
substitution in glycoprotein D, but not of wild-type virus,
in agreement with its ability to mediate entry of the mutant but not of
wild-type virus.
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TEXT |
In cell culture, herpes simplex
virus type 1 (HSV-1) infects cells through initial attachment and
subsequent fusion of the virion envelope with the plasma membrane, or
through contiguous cell-to-cell spread, by a mechanism as yet poorly
understood. A very similar situation probably occurs in human tissues.
At the time of primary infection, HSV replicates in mucosal tissues and
then enters nerve endings for retrograde transport to dorsal root
neurons. Upon reactivation from latency, the virus replicates in
neuronal cells and then is transported in an anterograde direction to
cells innervated by the neuron. The anterograde transport and subsequent lesions occur in the presence of neutralizing antibody. Cell-to-cell transmission represents, therefore, a major route for
virus spread to tissues. A central question is whether entry of virions
into cells and cell-to-cell spread of virus represent distinct pathways.
Relevant to this report are the following.
(i) The receptors for HSV entry broadly expressed in human cell lines
belong to an immunoglobulin family. For nomenclature, see the Appendix
and Table 1. Nectin1
, also named PRR1
(poliovirus receptor-related 1), or HveC (herpesvirus entry
mediator C), mediates entry of all HSV-1 and -2 strains tested
(15, 29, 50). Its splice variant isoform HIgR (herpesvirus
immunoglobulin-like receptor) (hereafter nectin1
) shares with
nectin1
the ectodomain, made of one V and two C2 domains
(7). Nectin1
and nectin1
interact with the virion
glycoprotein D (gD) (7, 15, 24). The region with
gD-binding activity and functional in HSV entry is located in the V
domain (6, 25). The C2 domain is involved in oligomerization (25). Nectin2
(also known as PRR2
or HveB) and
nectin2
(PRR2
) are homologs of nectin1 and are 32% identical to
nectin1 in the ectodomain region. They serve as low-efficiency
receptors for entry of HSV-1 mutants carrying substitutions in gD at
residues 25 to 27, but not of wild-type virus (4, 11, 27, 28, 50,
53). The cellular function of nectin1
, nectin2
, and nectin2
is that of intercellular adhesion molecules. They are anchored to the actin cytoskeleton and are recruited to cadherin-based adherens junctions through binding to L-afadin (27,
50).
(ii) There is evidence that molecules that mediate HSV attachment
to cells, and its entry, participate in cell-to-cell spread. Thus, heparan sulfate proteoglycan, a cell surface
glycoprotein carrying glycosaminoglycans, enhances
the initial attachment of HSV to cells (49) and enables the
spread of syncytial strains (46) but is dispensable
for spread of wild-type virus (17). Cells defective in entry
receptors do not allow cell-to-cell transmission of virus; this is
enabled by transfection of HveA (herpesvirus entry mediator A)
(34), a mediator of HSV entry that belongs to the tumor
necrosis factor receptor family (43, 51).
(iii) HSV strains may be divided into two groups with respect to the
mechanism of cell-to-cell transmission. Wild-type strains (also
designated syn+) spread across the junctions
between the membranes of adjacent cells and cause infected cells to
aggregate into clumps. Syncytial mutant strains
(syn
) spread by fusion of the infected
cell with adjacent uninfected cells and form multinucleated
polykaryocytes or syncytia (see references 42 and
48). Both strains enter cells by the same mechanisms
(7, 15). A key question is whether cell-to-cell spread of
cytoaggregating strains and cell fusion by syncytial strains involves
identical or different cellular functions.
(iv) The four virion glycoproteins required for virion
entry into the cells, gD, gB, gH, and gL, also participate in
cell-to-cell transmission. Thus, mutant viruses with deletions in each
glycoprotein are defective in both processes (3, 14,
26, 44). Antibodies to the glycoproteins block
both steps (16, 19, 21, 35, 38, 39). A case in point is gD.
Soluble forms of gD or anti-idiotypic antibodies mimicking gD
inhibit both virus entry and cell-to-cell transmission (21, 22,
36).
(v) The entry of free virion and cell-to-cell spread differ with
respect to the role of the two virion glycoproteins, gE and gI, which form a heterocomplex. The complex localizes to the cell-cell junctions and favors virus spread across the junctions in cell cultures
and in neurons in vivo (9, 10, 23). In its absence, the rate
of HSV entry into cells is not altered (8). Also for the
animal alphaherpesvirus pseudorabies virus (PrV), the gE-gI complex
mediates cell-to-cell spread and transmission to specific neuronal
circuits (5, 52, 54). Other HSV membrane proteins, gG, gM,
and UL45, appear to play a role in cell-to-cell spread of syncytial
strains but not in virion entry (2, 18, 31).
In these studies, we show that nectin1 mediates cell-to-cell spread of
wild-type HSV-1, but not of syncytial strains, both in cells expressing
the cDNA of the receptor as a transgene and in a variety of human cell
lines. Nectin2
serves for cell-to-cell spread of a mutant virus
carrying an L25P substitution in gD but not of wild-type virus.
Nectin1
and nectin1
mediate cell-to-cell spread of
HSV-1(F).
To investigate whether nectin1
and nectin1
play a
role in cell-to-cell transmission of HSV-1, we compared the abilities of HSV-1(F) (12) and its derivative R8102 (7) to
form plaques in cells defective in receptors for virus entry (J cells)
or in clonal derivatives of J cells, which constitutively express
nectin1
or nectin1
cDNA (designated as nectin1
or nectin1
cells) (7). Three series of experiments were performed. In
the first, since J cells cannot be infected with HSV-1 because of the
lack of receptors for entry, the DNA of HSV-1(F) was transfected into J
cells (1 µg of DNA/well of a six-well dish) and, for comparison, in
nectin1
cells. The cultures were monitored for plaque formation 2 to
3 days later by immunostaining with a polyclonal antibody to gM (1). The results in Fig. 1A
show that, in monolayers of J cells, infected cells consisted of single
cells or very small aggregates and plaques were not formed, whereas in
monolayers of nectin1
cells plaques were readily formed. In the
second experiment, nectin1
or nectin1
cells were infected with
R8102, which carries a lacZ gene under the
27 promoter.
Infection with this virus is readily monitored as
-galactosidase
(
-Gal) activity by X-Gal
(5-bromo-4-chloro-3-indolyl-
-D-galactoside) staining (34). In nectin1
or nectin1
cells,
plaques were readily formed (Fig. 1B) and were undistinguishable from
those formed in nectin1
cells transfected with the HSV-1(F)
DNA (compare panels b and e of Fig. 1). We note that throughout the
study we found a general agreement between results obtained with
wild-type virus and those obtained with the R8102 recombinant, whose
infection can be readily quantified as
-Gal activity. In the third
series of experiments, an infectious center assay was performed, as
described in reference 43. Nectin1
cells,
infected with R8102, were trypsinized 4 h after infection and
seeded onto recipient monolayers of J, CHO (also defective in entry
receptors) (34), or nectin1
cells. The seeded cells and
the recipient monolayers were constantly maintained in the presence of
pooled human gamma globulins, to block the infectivity of virions
possibly released and to ensure that the detected plaques were formed
only by cell-to-cell spread. The seeded cells became attached to the
monolayer within 5 h or less in these as well as in all subsequent
infectious center assays, with an efficiency estimated at >95%. The
results in Fig. 1A show that plaques were not formed when infected
nectin1
cells were seeded onto recipient monolayers of J or CHO
cells but were formed when they were seeded onto recipient monolayers
of nectin1
cells (data not shown). Taken together, these experiments
indicate that plaque formation does not ensue in cells defective in
virus entry receptors (J or CHO), that nectin1
or nectin1
can
mediate cell-to-cell spread of HSV-1, and that virus was not
transmitted from a receptor-positive to a receptor-negative cell. No
major difference was observed between cells expressing the
and
cells expressing the
isoform of nectin1.

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FIG. 1.
Cell-to-cell spread of HSV-1 occurs in
nectin1 - or nectin1 -expressing cells (B) but not in the
receptor-negative J or CHO cells (A). (a) Micrograph of J cells
transfected with HSV-1(F) DNA shows only singly infected cells or small
aggregates. (b) Micrograph of stable transformants of J cells
expressing nectin1 transfected with HSV-1(F) DNA shows presence of
plaques. (c and d) Infectious center assay. Monolayers of nectin1
cells infected with R8102 were trypsinized and seeded onto recipient
monolayers of J (c) or CHO (d) cells. Note the absence of plaques. (B)
Plaque formation in nectin1 or nectin1 cells infected with R8102
and inhibition by MAb R1.302. (e and f) Micrographs of
nectin1 -expressing J cells infected with R8102, unexposed (e) or
exposed to MAb R.1302 (f). (g and h) Micrographs of
nectin1 -expressing J cells infected with R8102, unexposed (g) or
exposed to MAb R1.302 (h). Note that plaque size is greatly reduced in
panels f and h relative to size in panel e or g. Infected cells were
detected by immunostaining with polyclonal antibody to gM (a and b) or
by X-Gal staining (c to h). Pictures were taken in an Axioplan Zeiss
microscope. All pictures are at the same magnification.
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Plaque formation in nectin1

and nectin1

cells was indeed
dependent upon expression of the receptors, as incubation of infected
cells with monoclonal antibody (MAb) R1.302 to nectin1 (
30),
from 4 h after infection till fixation, reduced the plaque size
to
small aggregates (Fig.
1B). An irrelevant MAb (MAb 6E2 to p48
of human
herpesvirus 6B), which does not cross-react to any cellular
or HSV
protein (
13), had almost no effect (data not shown).
As
expected, the number of plaques in nectin1

and nectin1

cells
exposed to MAb R1.302, scored by counting the single cells and
the
small aggregates, did not differ from the number of plaques
scored in
the cultures not treated or exposed to the irrelevant
MAb (data not
shown). The effect of MAb R1.302 was quantified
by exposing
R8102-infected nectin1

cells, grown in 96 wells,
to increasing
amounts of purified immunoglobulins G (IgGs) from
MAb R1.302, added at
4 h after infection. Plaque formation was
monitored 48 h
later as

-Gal expression, with ONPG
(
o-nitrophenyl-

-
D-galactopyranoside)
as
substrate (
34). Figure
2A
shows that MAb R1.302 inhibited
plaque formation in a dose-dependent
fashion; 50% inhibition occurred
at 0.08 mg/ml. At the same
concentration, the control pooled mouse
immunoglobulins had no
significant effect. We note that the MAb
concentrations required
to inhibit plaque formation were higher
than those required to block
HSV infectivity in the same cells
(
7). In replicate
samples, MAb R1.302 (ascites fluid, 1:25)
inhibited plaque
formation approximately to the same extent as
did purified IgGs at 0.32 mg/ml. The remaining experiments were
carried out under the former
conditions.

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FIG. 2.
MAb R1.302 (A) and soluble nectin1 (B) inhibit
plaque formation in nectin1 -expressing J cells infected with R8102.
(A) Nectin1 -expressing J cells in 96 wells, infected with R8102,
were exposed to the indicated concentrations of purified IgGs from MAb
R1.302 ( ), control mouse IgG ( ), or R1.302 ascites fluid ( ),
from 4 h after infection. Infection was detected 48 h later
by permeabilization with 0.5% NP-40 and quantitative detection of
-galactosidase activity with ONPG, followed by reading of the
optical density (OD) at 405 nm in a Bio-Rad enzyme-linked
immunosorbent assay reader. The reading in untreated cultures was in
the linear range (around 1 optical density unit) and was made equal to
100%. Each point represents the average of triplicate samples. The
values in the abscissa represent the concentrations of purified IgGs
( and ) or dilution of ascites fluid ( ). (B)
Nectin1 -expressing J cells infected with R8102 in 96 wells were
exposed to the indicated concentrations of the soluble form of nectin1
containing the entire ectodomain fused to the Fc portion of human
IgG (VCC1-Fc) or containing the single V domain (V1-Fc) or to bovine
serum albumin (BSA), from 4 h after infection. The
soluble forms of nectin1 were described previously (6).
Infection was detected as described for panel A. The values in the
ordinate represent the optical densities (OD) at 405 nm (×100).
Each point represents the average of triplicate samples. (C)
Micrograph of R8102-infected J cells expressing a chimeric form
of nectin1 [V(HIgR)-PVR ] that contains the V domain of nectin1
fused to C domains and the transmembrane and cytoplasmic regions of
poliovirus receptor.
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The V domain of nectin1 is functional in cell-to-cell spread.
The region of nectin1
and nectin1
functional in binding to gD and
in virion entry is located in the V domain (6, 25). The
first evidence that the V domain of nectin1 also plays a key role in
the spread of the virus was provided by the inhibitory effect of MAb
R1.302, which recognizes an epitope located in the V domain
(6). Additional evidence was provided in two series of
experiments. First, cell-to-cell spread occurred in cells
which expressed a chimeric form of nectin1, originally named
V(HIgR)-PVR
(6), consisting of the V domain of
nectin1 fused to the C domains and transmembrane and cytoplasmic
regions of the poliovirus receptor (PVR; also CD155 or HveD)
(15, 32) (Fig. 2C). Second, a soluble form of nectin1
carrying the entire ectodomain (VCC1-Fc), or the single V domain
(V1-Fc) fused to the Fc portion of IgG (6), could compete
with cell-bound receptor and thereby block cell-to-cell spread of
virus. In this experiment, infected nectin1
cells
were incubated with VCC1-Fc or V1-Fc from 4 h after infection.
This caused a dose-dependent inhibition and about 50% reduction at the highest concentration used (600 nM) (Fig. 2B). Higher
concentrations of VCC1-Fc or V1-Fc were not tested, because of
limitations in the quantities of recombinant proteins that could be
produced. As noted above for MAb R1.302, the concentrations of
VCC1-Fc and V1-Fc which inhibit cell-to-cell spread were higher than
those required to inhibit virus infectivity in the same cells
(6). This may reflect a limited accessibility of the
antibodies, or soluble receptor, to receptors located at adherens
junctions, as opposed to full accessibility to receptors located in
regions of the plasma membrane not engaged in cell-cell junctions.
Nectin1
or nectin1
mediates cell-to-cell spread of wild-type
virus in a variety of human cell lines.
A variety of human cell
lines express nectin1 and are susceptible to HSV infection (7,
15). The pathway of entry is via nectin1, and infection is
inhibited by MAb R1.302 (7). The antibody could be expected
to block virus transmission, provided that nectin1 is the principal
receptor serving also for virus spread. The effect of antibody R1.302
on formation of plaques and infectious centers was assessed in a number
of human cell lines of different origin, namely, HEp-2 (epithelial
carcinoma), 143tk
(a derivative of human sarcoma), 5637 (epithelial bladder carcinoma), and Lan5 (neuroblastoma).
Representative results in Fig. 3A show that, in 143tk
and HEp-2 cells, R8102 plaques were
decreased in size, although to a lower extent in HEp-2 cells than in
the nectin1
cells or in 143tk
cells. The inhibitory
effect of MAb R1.302 was quantified in an infectious center assay.
Infected nectin1
cells were trypsinized at 4 h after infection
and seeded onto recipient monolayers of human cell lines in the
presence or absence of MAb R1.302. The number of stained cells in the
monolayer was determined by means of Photoshop software, as detailed in
the figure legend. This type of measure accounts for the overall number
of stained cells in a monolayer and was expressed as percentage
relative to the overall number of stained cells in the corresponding
monolayer not exposed to the antibody. As shown in Fig. 3B, the extent
of inhibition was 98% in recipient monolayers of nectin1
cells and ranged from 80 to 67% in the other recipient monolayers. While the
partial inhibition may reflect the concomitant activity of additional
receptors, the results clearly indicate that nectin1 is the principal
receptor available for virus transmission in a number of human cell
lines.

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FIG. 3.
(A) MAb R1.302 inhibits R8102 plaque formation
in HEp-2 and 143tk cells. Shown are micrographs of HEp-2
(a to c) and 143tk (d to f) cells infected with R8102,
unexposed (a and d) or exposed to MAb R1.302 (b and e) or to an
irrelevant MAb (c and f), from 4 to 48 h after infection. Plaques
were detected by X-Gal straining. (B) MAb R1.302 reduces infectious
center formation in human cell lines. Nectin1 cells infected with
R8102 were trypsinized at 4 h after infection and plated onto
monolayers of recipient cells in the absence (control) (left) or
presence (right) of MAb R1.302 in six-well plates. Recipient cells were
nectin1 cells, 143tk , HEp-2, 5637, and Lan5 cells.
Monolayers were stained with X-Gal. The stained six-well dishes were
scanned in an Agfa StudioStar scanner, equipped with incident light,
and the image was imported by means of Photoshop software. The number
of stained cells was determined by the histogram program. This measure
accounts for all the stained cells in the monolayer. The overall number
of stained cells in the monolayer treated with MAb R1.302 was expressed
as a percentage relative to the corresponding untreated monolayer. All
pictures are at the same magnification.
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Nectin1
and nectin1-
do not mediate cell fusion induced by
syncytial strains.
Nectin1
, 143tk
, and HEp-2
cells were infected with the syncytial strain HSV-1(MP) (20)
or HFEM-syn (55), and incubated with MAb R1.302, from 4 h after infection. Representative results illustrated in Fig.
4 show that the two syncytial strains
behaved quite differently from the wild-type virus. The antibody did
not significantly affect the plaque size of either virus in any of the
cells tested. The number of plaques was also not affected (data
not shown). The results indicate that cell fusion by HSV-1(MP) and
HFEM-syn is mostly independent of nectin1.

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FIG. 4.
MAb R1.302 does not reduce plaque formation by HSV-1(MP)
or HFEM-syn. Shown are micrographs of nectin1 (A and B) and
143tk (C and D) cells infected with HSV-1(MP) or
HFEM-syn, respectively, and unexposed (A and C) or exposed to MAb
R1.302 (B and D) from 4 h after infection till fixation. Plaques
were detected by immunostaining with polyclonal antibody to gM. All
pictures are at the same magnification.
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Nectin2
mediates cell-to-cell spread of an HSV-1 gD-mutant.
Nectin2
and nectin1
can serve as entry receptors for
gD-unrestricted mutants carrying substitutions in gD at residues 25 to
27, but not for wild-type virus (28, 53) (Table 1). To test
the ability of nectin2
to serve in cell-to-cell spread, nectin2
cells (28) were infected with HSV-1(U10), which carries the
L25P substitution in gD and can enter nectin2 cells (4, 28).
The infected cultures were incubated in the absence or presence of MAb
R2.525, a MAb to nectin2 which blocks HSV-1(U10) entry (28,
30). The results in Fig. 5 show
that HSV-1(U10) could form plaques in nectin2
cells. They were
reduced in size by MAb R2.525. These results were confirmed and
extended in an infectious center assay, where HSV-1(U10)-infected
nectin1
cells were trypsinized and seeded onto a monolayer of
nectin2
cells in the absence or presence of MAb R2.525. Plaques were
formed and were reduced in size by the antibody (data not shown). To ascertain whether nectin2 can serve as a receptor for the spread of
wild-type virus, nectin2
cells were transfected with the DNA of
HSV-1(F), to overcome the need for a receptor. This resulted in singly
infected cells or small aggregates but not in plaques (Fig. 5C). Taken
together, the results indicate that nectin2
can serve as a receptor
for cell-to-cell spread of HSV-1(U10) but not of wild-type HSV-1.

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FIG. 5.
(a and b) Plaque formation in nectin2 -expressing
cells infected with HSV-1(U10) and inhibition by MAb R2.525. Shown are
micrographs of nectin2 cells, which harbor a lacZ gene
driven by the 27 promoter, infected with HSV-1(U10) and maintained
in the absence (a) or presence (b) of MAb R2.525 from 4 h after
infection. (c) Micrograph of nectin2 cells transfected with HSV-1(F)
DNA. Note singly infected cells or small aggregates and the absence of
plaques. (a and b) Infection was monitored as -Gal activity. (c)
Cells were stained with polyclonal antibody to gM.
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The results presented in this paper show the
following.
(i) They identify the immunoglobulin-like receptors nectin1

and
nectin1

as cellular functions involved in cell-to-cell transmission
of wild-type HSV-1, both in cells expressing nectin1 cDNA as a
transgene and in a variety of human cell lines. Cell-to-cell spread,
like entry, involved the V domain of nectin1. In addition, transmission
could not take place from receptor-positive to receptor-negative
cells.
Nectin1 is expressed in human tissues, including central
nervous system
and tissues of epithelial origin (
7). Taken
together, these
properties make this molecule a likely candidate
that mediates virus
spread to tissues that are the target of HSV
infection in humans. With
respect to the function of nectin1,
HSV differs from PrV. In the case
of PrV, which needs gD for virus
entry, but not for cell-to-cell
transmission (
40,
41,
45),
the human HveC/nectin

,
HveB/nectin2

, and HveD enabled entry
of virions into the resistant
CHO cells, but typical plaques were
not formed (
37). The
small clusters of infected cells formed
in cultures expressing these
receptors were similar to those formed
in CHO cells lacking receptors
(
37).
(ii) They identify nectin2

as a mediator of cell-to-cell
transmission for an HSV gD mutant carrying a substitution at residue
25, but not for wild-type virus. Nectin2

shows, therefore, the
same
restricted range as a mediator of virus transmission and
as a mediator
of virion entry (
28,
53). Both activities are
consistent
with its ability to interact physically with mutant
gD and failure to
interact with wild-type gD (
28).
(iii) They show that cell fusion induced by syncytial strains occurs
independently of nectin1. This was a surprising result,
in view of the
ability of the syncytial viruses to enter cells
via nectin1 (
7,
15). Syncytial and cell-aggregating strains
were reported to be
able to use HveA for cell-to-cell transmission
in cells transfected
with the cDNA of the mediator (
43,
51).
However, given that
its expression is limited to highly specific
cell lineages, this
molecule cannot represent the principal mediator
for transmission of
syncytial strains in the majority of human
cell lines. Recently,
3-O-sulfated heparan sulfate has been shown
to provide a binding site
for gD and initiate HSV entry (
47).
Whether human cell lines
can actually be infected with HSV through
this moiety has not been
determined. It remains also to be determined
whether it can mediate
cell fusion of syncytial strains. In the
past, it has been speculated
that cell fusion induced by syncytial
strains of HSV mimics and
represents a good model for the fusion
event between virion and plasma
membrane in the entry process.
The results presented here underscore a
notable difference between
the two activities and identify the usage of
cellular receptors
as yet another difference between the two processes.
Current findings
raise the possibility that cell fusion induced by the
syncytial
strains involves different cellular components than does the
spread
of wild-type cell-aggregating
HSV.
(iv) Nectin1

, nectin2

, and nectin2

are intercellular adhesion
molecules that act by homophilic interaction and are recruited
to
adherens junctions (
27,
50). Nectin1

differs from
nectin1

,
nectin2

, and nectin2

in that it does not carry the
conserved
C-terminal motif (A/ExYV) that binds the latter molecules to
the
PDZ domain of
L-afadin, an F-actin binding protein. It
is nonetheless
expressed at the cell surface and also at cell-cell
contact sites,
although at reduced efficiency (our unpublished
observations).
Consistently, engineered forms of nectin1

and
nectin2

that lack
the C-terminal motif maintain the ability to
localize at cell-cell
contact sites (
33,
50). Current
data indicate that nectin1
serves in cell-to-cell spread of HSV, as
does its isoform nectin1

.
Therefore, binding to
L-afadin
does not seem to be a prerequisite
to promote cell-to-cell spread
of HSV. Of note, the two viral
glycoproteins that play a
role in cell-to-cell transmission of
virus, but not in entry of free
virions, gE and gI, also localize
at cell-cell junctions
(
10). Previously, one of our laboratories
showed that
homophilic interaction of nectin2

, or nectin2

, correlates
with
the
cis dimerization of the molecules at the cell surface
and that this function requires a domain different from that functional
in HSV entry (
27,
28). It can be proposed that the
nectin1
and nectin1

and nectin2

and nectin1

molecules
promote cell-to-cell
spread by establishing the necessary intercellular
contacts between
juxtaposed cells, both by engaging in homophilic
interaction and
by interaction with viral gD, the viral ligand of
nectin1 and
nectin2. In turn, the viral gD that engages with nectin1,
or nectin2,
may be expressed at the surface of the infected cell and/or
in
progeny virions. The intercellular contacts created by nectin1,
or
nectin2, might contribute to encasing the progeny virus within
the
intercellular junctions and to shielding it, in part, from
molecules present in medium. These may be the human gamma
globulins
normally used to allow plaque formation or the molecules used
in this study, i.e., antibodies to nectin1 or nectin2 or soluble
forms
of nectin1. This hypothesis would explain why high concentrations
of
the antibodies or soluble receptor were necessary to exert
an
inhibitory
effect.
 |
APPENDIX |
HveC/PRR1, HIgR, HveB/PRR2
, and PRR2
are members of an
immunoglobulin family whose function has been recently identified as
that of intercellular adhesion molecules (27, 50). The molecules were renamed nectin1 and nectin2, replacing PRR1 and PRR2,
respectively (50). Knowledge of the natural function of these proteins may help in understanding the mechanism by which they
fulfill their function as viral receptors. Furthermore, receptor designations in virology should be comprehensible to broad audiences in
cell biology and not merely to the workers in the field. To this aim,
we propose to maintain, for the alphaherpesvirus immunoglobulin-like receptors, the designation that describes their biological function. Examples of this rule are numerous, e.g., intercellular adhesion molecule, vascular cell adhesion molecule 1, CD4, chemokine receptors CCR5 and CXCR4, integrins, amino acid transporter, carboxypeptidase D,
fibronectin, etc. Table 1 lists the names given to members of the
immunoglobulin subfamily and the viruses for which they serve as
receptors. The
and
suffixes are those used in the literature to
designate the different isoforms of poliovirus receptor. Where
appropriate, the prefixes h, m, etc., can be used to designate the
species of origin (human, murine, etc., respectively).
 |
ACKNOWLEDGMENTS |
We thank Elisabetta Romagnoli for invaluable assistance with cell
cultures. We thank N. S. Markovitz and B. Roizman (Chicago, Ill.)
for the gift of R8102.
The work done at the University of Bologna was supported by grants from
Target Project in Biotechnology/CNR, Telethon grant A141, MURST 40%,
University of Bologna 60%, and pluriannual plan. The studies at INSERM
U119, Marseille, were aided by INSERM, the Association pour la
Récherche Contre le Cancer (ARC), and the Ligue Nationale
Française Contre le Cancer (LNFCC).
 |
FOOTNOTES |
*
Corresponding author. Mailing address: Dipartimento di
Patologia Sperimentale, Sezione di Microbiologia e Virologia, Via San Giacomo, 12, 40126 Bologna, Italy. Phone: 39 51 2094733/34. Fax: 39 51 2094747. E-mail: campadel{at}alma.unibo.it.
 |
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