Institut für Virologie und Immunbiologie, Universität Würzburg, Verbacher Str. 7, 97078 Würzburg, Germany1
Author for correspondence: Jürgen Schneider-Schaulies. Fax +49 931 2013934. e-mail jss{at}vim.uni-wuerzburg.de
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Introduction |
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For most viruses, the receptor distribution in an individual is wider than the observed tissue tropism. Also, many virusreceptor interactions determine the host range and therefore constitute an interspecies barrier. Although mutations can accumulate rapidly, especially in RNA viruses, tolerable changes in the viral envelope proteins are constrained by the need to interact with a certain receptor. However, eventually, such changes may drastically alter the tropism and virulence of a virus. Furthermore, even in non-infected cells, the virusreceptor interaction may induce signal transduction, resulting in cytokine secretion, apoptosis, stimulation of the immune response, or, conversely, immunosuppression.
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Virus tropism and pathogenicity are multifactorial |
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The budding and the release of viruses can also have a decisive impact on pathogenesis by determining the parameters of virus spread. This is obvious for pantropic viruses such as influenza or Sendai. The uptake and release of these viruses in polarized epithelial cells of the respiratory tract is restricted to the apical side. This is an important factor in preventing systemic infection. In contrast, viruses that are released basolaterally may spread systemically (for a review, see Compans, 1995 ).
The primary infection usually involves a small initial dose of virus and leads to little impact for the host. Replication of virus within the initial site of infection will then lead to a substantial multiplication of virus particles and considerable damage in secondary target organs. For the spread of virus to different organs and cell types, the use of multiple receptors might be advantageous. Viruses may either have the intrinsic capacity to use more than one receptor, as found for complex viruses such as herpes viruses (Tufaro, 1997 ), or they may change their capacity to bind to receptors or co-receptors by mutation of their envelope proteins. Both mechanisms are observed during HIV infection.
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Receptor usage and the pathogenesis of HIV |
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The concept of consecutive conformational changes is valid for HIV entry. The most favoured current model proposes that the initial binding of gp120 to CD4 induces a conformational change in gp120 which enables it to interact with a co-receptor. This interaction is supposed to induce a further conformational change in the viral envelope which results in the activation of gp41 and the positioning of its fusion active peptide in close proximity to the membrane and finally in the insertion of the fusion peptide into the membrane of the target cell. The dramatic conformational changes of gp120 have been confirmed by X-ray crystallographic studies (for a review, see Berger et al., 1999 ). As with influenza virus HA, the native HIV envelope protein gp120/gp41 complex appears to be trapped in a metastable state until the receptor interaction induces the transition to an energetically more favourable state. This conclusion is also supported by the enhancement of the infection with low concentrations of soluble CD4 or neutralizing antibodies which can facilitate structural alterations (Allan et al., 1990
; Sullivan et al., 1995
), and the inhibition of infection or cellcell fusion by short peptides interacting with transiently exposed structures of the envelope proteins (Eckert et al., 1999
and references therein).
A major contribution to HIV pathogenesis (Fauci, 1993 , 1996
) is the presence of the attachment receptor, CD4, on cells central to the immune response, and its downregulation following infection (Aiken et al., 1994
; Jabbar et al., 1990
; Raja et al., 1994
). Target cells for HIV are T helper cells, dendritic cells, including Langerhans cells in the skin and in mucous membranes, and cells of the monocyte-macrophage lineage, including microglial cells in the brain. Dendritic cells present in the genital mucosa are now thought to be the first target cell in the host. They can transport the virus to lymph nodes and distribute it to contacting T cells possibly by circumventing co-receptor-dependent mechanisms (Hladik et al., 1999
). Moreover, dendritic cells lose their immunostimulatory functions upon infection, which is the first step to immunodeficiency (for a review, see Knight & Patterson, 1997
).
Glycoprotein 120 expressed on the surface of macrophages may induce apoptosis in lymphocytes via co-receptor interactions, which eventually contributes to the destruction of these immune cells (Herbein et al., 1998 ). In the CNS, receptors such as galactocerebroside (GalC; Bhat et al., 1991
, 1993
; Harouse et al., 1991
) or co-receptors alone can interact with soluble gp120 and influence pathogenesis. Glycoprotein 41 has also been found to induce a proliferative inhibition in lymphocytes (for reviews, see Denner, 1998
; Haraguchi et al., 1995
). Synthetic peptides containing 17 amino acids of the gp41 sequence inhibit the mitogen-stimulated and the IL-2-dependent proliferation of T cells, the mixed lymphocyte reaction, and the respiratory burst and chemotaxis of monocytes. Attempts to identify cellular receptors mediating the suppressive effects are in progress but the mechanism has not yet been elucidated.
Interestingly, a natural co-receptor mutation exists which directly influences the interaction with HIV and which is of pathogenetic relevance. A 32 bp deletion in CCR5, which abolishes the virus site of interaction, may confer partial resistance to infection with macrophage-tropic HIV-1 to individuals who carry the mutation (Huang et al., 1996b ; Liu et al., 1996
; Samson et al., 1996
). Haplotype analyses indicate that the mutated allele originated quite recently, approximately 700 years ago in northeastern Europe. The timing and distribution of the mutation suggest that a former epidemic, which exerted enormous selective pressure against CCR5, might have facilitated the rapid distribution of the 32 bp deletion (Libert et al., 1998
; Stephens et al., 1998
). It has been suggested that in addition to the reduced levels of CCR5, high levels of the chemokines MIP-1
, MIP-1
and RANTES may contribute to the clinical resistance or the slow progression of the disease in certain individuals. These findings may be exploited therapeutically by designing substances which block the co-receptor interaction with HIV, or by removing co-receptors by somatic gene therapy (Berger et al., 1999
). Viruses expressing the cellular receptors CD4 and CXCR4 as envelope proteins have also been engineered to eliminate gp120-positive infected cells (Mebatsion et al., 1997
; Schnell et al., 1997
). Viruses bearing these molecules interact with HIV-1-infected cells in tissue culture and reduce HIV titres in infected T cell lines by a factor of 10000. However, the clinical application of such viruses appears questionable.
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Competition for the same receptors: coxsackie viruses and adenoviruses |
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In order to investigate the internalization mechanism, the three-dimensional structure of soluble recombinant v
5 molecules bound to adenovirus has been determined. The results suggest a precise spatial arrangement of the five arginine, glycine, asparagine (RGD)-containing protrusions on the penton base promoting integrin clustering and signalling events required for virus internalization (Chiu et al., 1999
). The interaction of integrins with RGD-containing peptides can induce caspases and apoptosis (Ruoslahti & Reed, 1999
and references therein). It is not known whether viruses also induce such signals via interaction with integrins.
Adenoviruses have the ability to infect a wide range of tissues and have been identified as the cause of diseases such as respiratory infections, epidemic keratoconjunctivitis, pneumonia, cryptic enteric infection and gastroenteritis (Wadell, 1990 ). As suggested earlier, the different tropisms of the adenoviruses probably result from differential receptor usage. Based on the recent findings, chimeric adenoviruses with exchanged fibres or fibre knobs have been constructed to target infections to certain tissues (Stevenson et al., 1997
).
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Poliovirus: species tropism, but not tissue tropism, is determined by receptors |
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In man, PVR proteins are expressed in many cells and tissues, including the small intestine, lung, liver, heart, neurons of the spinal cord and the motor end-plate of skeletal muscles (Freistadt, 1994 ; Leon-Monzon et al., 1995
; Nomoto et al., 1994
). Since liver, lung and heart are not normally considered to be replication sites of poliovirus, this observation indicates that the susceptibility of tissues to poliovirus is not determined merely by the distribution of PVR. The susceptibility of PVR-positive mononuclear cells in the blood may play a role in the eventual CNS invasion (Freistadt et al., 1993
). However, it remains to be investigated which of the PVR isoforms are expressed by which cell type and how the expression is correlated with infection during poliomyelitis. A mouse homologue of hPVR does not bind poliovirus, including those viruses adapted to mice. Thus, hPVR determines the species tropism of poliovirus (for a review, see Nomoto et al., 1994
).
In hPVR-transgenic mice, poliovirus induces neurological defects similar to those observed in man. This is a perfect animal model to test the neurovirulence of various poliovirus strains (Deatly et al., 1999 ; Koike et al., 1991
; Ren et al., 1990
). Neurons, and not glial cells, were found to be infected and paralysis is caused by direct destruction of motor neurons. Interestingly, in both man and transgenic mice, the neurotropism of poliovirus cannot be explained solely by the tissue distribution of the receptor. Molecular determinants of neurovirulence and attenuation have been located in the 5'-proximal 1122 nucleotides of the viral genome (Macadam et al., 1993
). Most mutations in this part of the genome do not alter the receptor usage, but they influence the interaction with intracellular factors. The internal ribosomal entry site within the 5' non-coding region significantly contributes to host range specificity and neurovirulence (Gromeier et al., 1999
; Shiroki et al., 1997
).
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Members of the poliovirus receptor family are also used by ![]() |
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Heparan sulfate proteoglycans are used by several viruses as initial attachment receptors |
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As well as -herpesviruses, interaction with heparan sulfate has been demonstrated for HIV-1 (Mondor et al., 1998
), human cytomegalovirus (Compton et al., 1993
), foot and mouth disease virus (Jackson et al., 1996
), dengue virus (Chen et al., 1997
), Sindbis virus (Byrnes & Griffin, 1998
), vaccinia virus (Chung et al., 1998
) and adeno-associated virus type 2 (Summerford & Samulski, 1998
). It seems possible that heparan sulfate could help these viruses to adhere to a cell before further higher affinity receptors induce adhesion strengthening and mediate entry (Haywood, 1994
). This model is supported by results obtained using the flaviviruses, dengue virus and TBEV. Dengue virus binds first to heparan sulfate and then to a high affinity receptor, which induces endocytosis and subsequent cell membrane fusion (Chen et al., 1997
; Hung et al., 1999
; Putnak et al., 1997
). Thus, heparan sulfate proteoglycans on the cell surface can be used as initial attachment receptors by several viruses.
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The tropism of the ![]() |
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Interestingly, binding of EBV, or beads bearing the viral envelope proteins gp350/220, induce the capping and endocytosis of CD21 (Tanner et al., 1987 ; Tedder et al., 1986
). Thus, as found for viruses such as HIV and measles virus (MV), infection of cells with EBV leads to the downregulation of its receptor, CD21, from the cell surface. The normal function of CD21 is not completely understood, but it certainly plays an important role in antigen-specific B cell activation and differentiation, processes which are disturbed by the interaction with EBV. After the binding of ligands, CD21 and the antigen receptor become associated in the B cell membrane. In addition, further cell surface molecules, such as CD19 and CD81, associate with CD21 and form a multimolecular complex, which is probably involved in signal transduction. Antigen localization and the generation of B memory cells are largely dependent on the presence of the complement protein C3, and soluble CD21 fragments can suppress the immune response in mice.
EBV, the causative agent of infectious mononucleosis, is closely associated with Burkitts lymphoma and several benign and malignant lymphoproliferative diseases occurring in immunodeficient individuals. The cell tropism of EBV in these diseases can be explained by the use of CD21 as receptor. However, the EBV genome is also found in epithelial cell tumours such as nasopharyngeal and gastric carcinoma which do not express CD21. Therefore, the presence of a receptor other than CD21 on epitheloid gastric cells has been suggested (Hsu et al., 1996 ; Kasai et al., 1994
; Kim et al., 1998
; Yoshiyama et al., 1997
). A very efficient mode of infection with EBV, much more efficient (up to 800-fold) than infection with cell-free virus, is direct cell-to-cell spread (Imai et al., 1998
).
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Measles virus: also more than one receptor |
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As in the case of EBV and HIV, MV can induce the down-regulation of its receptor from the cell surface after infection or after the extracellular contact of cells with MV H protein (Krantic et al., 1995 ; Naniche et al., 1993
; Schneider-Schaulies et al., 1996
). Since the natural function of CD46 is to act as a co-factor for the cleavage of the complement factors C3b and C4b, and to protect cells from lysis by autologous complement (for a review, see Liszewski et al., 1991
), CD46-modulation by MV enhances the sensitivity of cultured cells to complement (Schnorr et al., 1995
). In vivo, this may cause a rapid clearing of infected cells and thus contribute to the attenuation of such downregulating MV strains. Different MV isolates vary considerably in their capacity to interact with CD46. In contrast to vaccine strains, a number of recent wild-type isolates do not downregulate CD46 (Schneider-Schaulies et al., 1995a
, b
). This capacity is closely related to amino acids at positions 451 and 481 in the H protein (Bartz et al., 1996
; Lecouturier et al., 1996
).
Recently, B cell lines have been used to isolate a number of MV strains which obviously do not interact with CD46 (Bartz et al., 1998 ; Hsu et al., 1998
; Tanaka et al., 1998
). MV isolates that do not interact with CD46 have a preferred tropism for lymphoid cells. Studies using recombinant MVs (Radecke et al., 1995
) with defined envelope proteins have confirmed these findings (Johnston et al., 1999
). It remains to be seen whether MVs present during the acute disease in vivo interact with CD46, and what consequences the differential receptor usage might have for the pathogenicity of acute and persistent MV infections.
The most intriguing question at present is how cellular receptors are involved in MV-induced immunosuppression. During immunosuppression, the number of peripheral blood lymphocytes is reduced and activated T cells are depleted from the circulation (Nanan et al., 1999 ; for reviews, see Griffin, 1995
; Schneider-Schaulies & ter Meulen, 1999
). Ex vivo, the proliferative response of peripheral blood lymphocytes to antigens or mitogens is strongly inhibited. The MV-induced immunosuppression is a multi-factorial process which may be influenced by soluble factors such as IL-12 (Karp et al., 1996
) and the direct contact of the viral HF glycoprotein complex and the surface of lymphocytes (Schlender et al., 1996
). The contact requirements for the proliferative inhibition of lymphocytes have been defined by using recombinant viral glycoproteins and recombinant viruses, and CD46 appears not to be required (Niewiesk et al., 1997a
; Schlender et al., 1996
). Recent data indicate that although a native HF complex is obligatory, the process of membrane fusion is not required for inhibition of T cell proliferation (Weidmann et al., 2000
). As in the case of HIV gp41, cellular receptors involved in the proliferative inhibition of lymphocytes have not yet been identified.
MV-induced CNS diseases and the mechanisms supporting virus persistence have been studied extensively (for a review, see Schneider-Schaulies et al., 1999 ). The influence of the virus attachment protein H on neurovirulence was investigated using antibody escape mutants in rats (Liebert et al., 1994
) and in a mouse model using a recombinant MV in which the H gene of the Edmonston strain was replaced by the H gene of the rodent-adapted neurovirulent MV strain CAM (Duprex et al., 1999a
). After intracerebral injection into suckling mice only the recombinant virus bearing CAM-H, and not the virus with the Edmonston-H, induced a neurological disease. However, the neurovirulence of the recombinant virus was reduced compared to the wild-type CAM strain, indicating that other viral genes also contribute to CAM-induced pathogenicity.
Recently, CD46-transgenic mice have been used to define the role of the cellular receptor for the neurotropism and virulence of MV. In such animals the normally apathogenic Edmonston strain is able to cause widespread neuronal infection and death in neonates, and scattered infection of neurons of adult mice (Rall et al., 1997 ). These findings clearly demonstrate that expression of a suitable receptor on neurons can mediate neurovirulence. However, in the periphery of adult CD46-transgenic mice or rats, receptor expression did not lead to a significant increase of susceptibility for MV, suggesting an intracellular block of virus replication (Blixenkrone-Moller et al., 1998
; Horvat et al., 1996
; Niewiesk et al., 1997b
). In contrast, a different line of CD46-transgenic mice seems to be more generally susceptible to MV infection (Oldstone et al., 1999
). Clearly, these differences in the susceptibility of different CD46 transgenic mice need to be further investigated. In interferon-
/
-receptor-deficient mice expressing a CD46 transgene, intracerebral inoculation of adult animals with low doses of MV caused encephalitis (Mrkic et al., 1998
). These findings underline the importance of the interferon system and associated intracellular factors for the virulence of this virus.
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Receptor interactions of lymphocytic choriomeningitis virus (LCMV) strains determine pathogenesis |
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Persistent infection of C3H/St mice with certain clones of LCMV strain WE can cause growth hormone deficiency syndrome (GHDS). Reassortant studies indicate that a single amino acid exchange at position 153 in the viral envelope protein G1 is sufficient to allow infection of the growth hormone-producing cells and cause GHDS (Teng et al., 1996 ). It is not yet known whether this change in the virus tropism and pathogenicity is due to alterations in receptor usage of such clones. Another pair of LCMV strains, strain Armstrong and clone 13, have been found to cause differential immunosuppressive effects in mice (Borrow et al., 1995
). Mice infected with LCMV Armstrong rapidly clear the infection, whereas mice infected with clone 13 develop a generalized immunosuppression associated with loss of interdigitating dendritic cells and failure to stimulate the proliferation of T cells. These two strains differ in only two amino acids, at positions 260 in the G1 protein and 1079 in the RNA polymerase. A difference in the tropism of the two strains has been found, which is probably caused by a stronger binding affinity of clone 13 to the LCMV receptor. This could enable clone 13 to infect cells expressing limited amounts of
-dystroglycan, or to infect cells more effectively than the Armstrong strain. These findings suggest an association between receptor usage and pathogenicity.
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Coronaviruses: receptors determine the host range |
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Coronaviruses of serogroup 1 interact species-specifically with aminopeptidase-N (APN) as the attachment receptor (Delmas et al., 1992 ; Kolb et al., 1996
; Yeager et al., 1992
). APN is a type II transmembrane glycoprotein and belongs to the family of membrane-bound metallopeptidases (Ashmun et al., 1992
). The protein is found in large amounts on the microvillar membrane of the small intestine and is also present on renal proximal tubule epithelium, synaptic membranes of the CNS and cells of the granulocytic and monocytic lineage (Delmas et al., 1994
; Look et al., 1989
; Olsen et al., 1988
). Human APN (CD13) is used as a receptor by HCV 229E not only for infection of lung fibroblasts but also for infection of neuronal and glial tissue culture cells (Lachance et al., 1998
). Interestingly, the host range of coronaviruses is associated with receptor usage, while the disease type is not (Hegyi & Kolb, 1998
; Tresnan & Holmes, 1998
).
The receptor for MHV was initially identified as the biliary glycoprotein Bgp1a, a member of the carcinoembryonic antigen (CEA) family of cell surface proteins (Dveksler et al., 1991 ; Williams et al., 1991
). Bgp1a consists of four immunoglobulin-like extracellular domains, a transmembrane domain, and either a long or a short cytoplasmic tail. It is expressed at the sites of virus entry such as the apical membranes of respiratory and intestinal epithelial cell layers, the luminal surfaces of endothelial cells, on hepatocytes, B lymphocytes and macrophages (Coutelier et al., 1994
; Godfraind et al., 1995
). In the liver, Bgp1a expression correlates with infection of hepatocytes and endothelial cells, leading to the development of hepatitis. However, other cells expressing this molecule, such as endothelial cells of the CNS, are not infected (Godfraind & Coutelier, 1998
). Although the molecular basis for this observation is not known, it may explain how the bloodbrain barrier prevents dissemination of MHV A59 into the brain.
MHV A59 binds only to Bgp1a on intestinal brush border membranes of susceptible mice, and not to membranes from humans, cats, dogs, pigs, cows, rabbits, rats, cotton rats or chickens (Compton et al., 1992 ). Other members of the CEA family in addition to Bgp1a, namely Bgp1b (Dveksler et al., 1993a
, b
; Yokomori & Lai, 1992
), Bgp2 (Nedellec et al., 1994
) and brain CEA (Chen et al., 1995
) may also serve as receptors, with different binding efficiencies (Zelus et al., 1998
). Bgp1a is the major receptor for MHV in susceptible mice, whereas Bgp1b, which is used less efficiently as a receptor, is expressed homozygously by resistant SJL mice (Williams et al., 1990
).
A change of receptor usage may be associated with the transition of the host range of coronaviruses from one species to the other. Conversely, experimental interspecies transfer of MHV also changed the receptor usage (Hensley et al., 1998 ). The S protein of MHV has recently been exchanged by targeted RNA recombination for the S protein of FIPV (Kuo et al., 2000
). The resulting chimeric virus acquired the ability to infect feline cells and lost the ability to infect murine cells, supporting the view that the host range of coronavirus infections is mainly determined by receptor usage.
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Do the known receptors for hepatitis viruses explain their liver tropism? |
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Human hepatitis B virus (HBV), an enveloped hepadnavirus with a partially double-stranded DNA genome of approximately 3200 nucleotides in length, binds to a 50 kDa binding factor (HBV BF) present in serum and on the surface of cells (Budkowska et al., 1993 ). HBV BF is a neutral metalloproteinase which shares substrate specificity with a family of membrane-type matrix metalloproteinases. Treatment of HBV with the metalloproteinase results in cleavage of the N-terminal part of the pre-S2 envelope protein, and probably induces a conformational change in the pre-S1 domain that enables cell membrane attachment and virus entry into T lymphocytes (Budkowska et al., 1997
). Since an inhibitor of the metalloproteinase blocked both processes, the host-dependent proteolytic activation of the envelope proteins seems to be essential for HBV entry into cells. The tissue tropism of HBV may be determined by this process of envelope activation and not by cellular receptors, which might be expressed ubiquitously (Budkowska et al., 1997
; Köck et al., 1996
).
An interesting mechanism has been proposed for the specific uptake of duck hepatitis B virus (DHBV) into hepatocytes using carboxypeptidase D (gp180) as a cellular receptor (Breiner et al., 1998 ; Kuroki et al., 1995
; Tong et al., 1999
; Urban et al., 1998
). This peptidase is a Golgi-resident protein which is found only to a limited extent at the external cell surface. It cycles to and from the plasma membrane and in doing so, it may function as a carrier leading to the endocytosis of DHBV (Breiner et al., 1998
). In spite of the high affinity binding of the DHBV surface protein to gp180, expression of gp180 in heterologous cells did not render them permissive to infection, suggesting that a species-specific co-receptor or co-factor is required for virus entry (Breiner et al., 1998
). The highly specific infection of the liver by DHBV does not correlate with the ubiquitous gp180 expression, suggesting other mechanisms for targeting the virus to the liver.
Suramin, a polyanionic compound similar to heparin, was found to block HCV binding to human hepatoma cells at a concentration similar to that reported to be effective against dengue virus, suggesting an interaction of HCV with glycosaminoglycans on the cell surface (Chen et al., 1997 ; Garson et al., 1999
). In addition, it was recently found that the E2 glycoprotein of HCV binds specifically to CD81, a transmembrane protein of the tetraspanin family (Pileri et al., 1998
). It is not yet clear whether CD81 acts as a cellular receptor for attachment and entry of HCV into target cells. CD81 is involved in a number of biological responses including cell adhesion, proliferation and differentiation of T and B lymphocytes (Levy et al., 1998
). Interestingly, the HCV E2 protein, after binding to CD81, induced aggregation of lymphoid cells and inhibited the proliferation of a B cell line (Flint et al., 1999
). This might have important consequences for the pathogenesis of HCV. Since glycosaminoglycans and CD81 are expressed by a wide variety of cells, additional specific factors must determine the liver tropism of HCV.
Taken together, there is no obvious common receptor-mediated pathway for hepatic viruses and none of the cellular receptors known so far can explain the specific liver tropism and pathogenesis caused by these viruses. Interestingly, a receptor for Marburg virus, the asialoglycoprotein, is expressed specifically on liver cells, although this virus has a quite different tropism (Becker et al., 1995 ). Marburg and Ebola viruses infect a wide spectrum of cells including neutrophils, mononuclear cells, endothelial cells, fibroblasts and hepatocytes, and cause fulminant haemorrhagic fevers. Thus, this liver-specific receptor is used by a virus with a much broader tropism. The viral glycoprotein gene encodes three forms of the G protein: two secreted soluble forms, sGP and GP1, and the membrane bound GP1/2, which are involved in the virus-specific pathogenesis (for a review, see Klenk et al., 1998
). The asialoglycoprotein receptor on hepatocytes may serve as a liver-specific receptor for Marburg virus, thereby explaining its liver tropism. However additional receptor molecules on other target cells must be postulated. The asialoglycoprotein receptor might be an attractive tool to target recombinant viruses as chemotherapeutic agents to the liver (Bitzer et al., 1997
).
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Cell-to-cell spread of viruses contributes to pathogenesis, but may not depend on cellular receptors |
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The cellular fusion-regulating proteins (FRP)-1 and -2 play a role in cellcell fusion. These proteins were initially found with monoclonal antibodies that stimulate the Newcastle disease virus (NDV)-induced cellcell fusion (Ito et al., 1987 , 1992
; Ohgimoto et al., 1995
). Interestingly, antibodies to FRP-1 stimulate NDV-induced and inhibit parainfluenza virus-induced cell fusion (Okamoto et al., 1997
). Recent data indicate that HIV-induced cell fusion is also regulated by FRP-1, integrins and the activation of tyrosine kinases (Ohta et al., 1994
; Tabata et al., 1998
). In addition, HIV DNA may also spread from cell to cell in a CD4-independent fashion via apoptotic bodies (Spetz et al., 1999
). Also, the syncytium formation of human T cell leukaemia virus type 1 is regulated in a cell-type-specific manner by ICAM-1, ICAM-3 and VCAM-1 and can be inhibited by antibodies to integrin
2 or
7 (Daenke et al., 1999
).
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Conclusions |
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Acknowledgments |
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