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Journal of Virology, October 2005, p. 12125-12131, Vol. 79, No. 19
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.19.12125-12131.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

MINIREVIEW

Adenovirus Receptors

Division of Infectious Diseases, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania

	INTRODUCTION

Top Introduction References

 
In 1996, in a discussion of adenovirus biology in a standard virology textbook, it was noted that "the identity of the cellular receptor remains a mystery" (78). In the past few years, not just one but multiple adenovirus receptors have been identified, and new information has accumulated about the early events in adenovirus infection. The interest in receptors has been stimulated in large part by interest in using adenovirus vectors for therapeutic gene delivery to specific tissues. In this review, we will summarize our present understanding of adenovirus interaction with receptors and the role of receptors in virus entry and tissue tropism.

	Adenovirus structure and classification.

 
Adenovirus (Ad) is a nonenveloped, double-stranded DNA virus. Viral DNA and associated core proteins are encased in an icosahedral capsid, with 20 triangular faces composed largely of the major capsid protein, hexon (Fig. 1A) (reviewed in reference 68). An elongated fiber projects from each of the 12 fivefold capsid vertices. At its proximal end, the fiber is bound to a pentameric structure, the penton base; at its distal end, the fiber forms a globular "knob" domain (Fig. 1B). In general, the fiber knob functions as the major attachment site for cellular receptors, while the penton base is involved in secondary interactions that are required for virus entry into the cell. The detailed structures of hexon (64), fiber (94, 95), and penton base (105) have been determined by crystallographic methods; the overall virion structure (86) has been determined, at somewhat lower resolution, by cryoelectron microscopy and image reconstruction.

View larger version (19K): [in this window] [in a new window]   FIG. 1. Adenovirus structure. (A) Virion structure at 17-Å resolution. Each of the 20 triangular faces of the capsid is composed of 12 copies of the hexon trimer (blue). At each fivefold vertex, a fiber (green) emerges from the pentameric penton base (yellow). The hexon capsid and penton base structures are derived from a cryoelectron microscopic image reconstruction of human adenovirus 5. Fibers are modeled from the atomic structure of the Ad2 fiber (95). Figure provided by Carmen San Martin. (B) Penton base. Side and top views, showing flexible RGD loops projecting from the surface. The insertion sites for fiber are also shown. (The figure is reprinted from reference 68 with permission of the publisher.) (C) Fiber structure and receptor binding sites. The fiber is a trimer whose monomers are indicated in red, blue, and green; the shaft is a tightly wound triple spiral; the knob is a more bulbous trefoil. The figure is modified from reference 95 with permission of the publisher.

	Overview of virus entry.

	Integrins as entry receptors.

 
Many adenovirus serotypes display an RGD peptide within the penton base, which serves as a recognition site for several cellular integrins, members of a large family of heterodimeric (ß) adhesion receptors. The engagement of integrins by the penton base induces signals, including activation of PI3 kinase (46), p130^CAS (47), and Rho GTPases (45), that are important for rearrangements in the actin cytoskeleton and initiation of virus internalization. Interaction with integrins is also important for virus escape from the endosome (99).

Integrins known to facilitate adenovirus entry include the vitronectin receptors vß3 and vß5 (100), as well as vß1 (44), 3ß1 (70), and 5ß1 (19), all of which recognize RGD ligands. The role of integrins has been studied most extensively for Ads 2 and 5, whose primary receptor is CAR. However, integrin-RGD interactions are also involved in entry by viruses that bind to other primary receptors (52, 75), and—with the exception of the subgroup F viruses Ads 40 and 41 (1, 18)—all of the adenoviruses whose sequences have been determined have an RGD sequence within the penton base. It is important to note that mutation of the penton base RGD sequence slows, but does not prevent, virus internalization and infection (6). It is not clear whether this indicates that entry occurs by integrin-independent routes or whether some virus interactions with integrins are independent of the RGD motif. Internalization of RGD-deficient virus is more rapid in cells that express high levels of fiber receptor, suggesting that recruitment of multiple fiber receptors may compensate for the loss of penton-integrin interaction (27).

One consequence of the two-step entry mechanism is that adenoviruses can be quite flexible in their use of primary receptors. The major function of the fiber receptor is to hold the virion in close proximity to the cell surface, permitting interaction with an integrin molecule; a variety of cell surface molecules can serve this function.

	ATTACHMENT RECEPTORS

 
CAR. The best-studied adenovirus receptor is CAR, a 46-kDa protein that also mediates infection by group B coxsackieviruses (9, 92). CAR is an immunoglobulin superfamily member with two immunoglobulin-like extracellular domains. It mediates homotypic cell adhesion (35) and is present in specialized intracellular junctions, including the cardiac intercalated disk (60) and the tight junction of polarized epithelial cells (14). Although CAR's tissue distribution in humans is not well defined, mRNA is present in a number of organs, including the heart, brain, pancreas, and intestine (92) as well as the lung, liver, and kidney (26). CAR-mediated signals have been proposed to suppress the proliferation of tumor cells (62), and CAR knockout animals have developmental abnormalities, including ventricular hyperplasia (12).

CAR expression on target cells permits virus attachment by selected viruses belonging to subgroups A (Ad12), C (Ad2, Ad5), E (Ad4), and F (Ad41); in addition, soluble CAR interacts with Ad31 (subgroup A) and Ads 9 and 19 (subgroup D) or with their isolated fibers (66). CAR also serves as a receptor for several animal Ads (15, 84, 89). These observations have sometimes been interpreted to mean that CAR is a receptor for all the viruses outside group B, but this need not be the case; subgroups may contain heterogeneous viruses, and even viruses within a serotype may differ in their receptor interactions.

Furthermore, results obtained with isolated fibers or soluble CAR may not reflect what happens when intact virus interacts with receptors on the cell surface. The crystal structure of fiber bound to CAR's N-terminal domain (D1) (28) reveals that CAR interacts with a site on the outer surface of the trimeric fiber knob (67). Alignments of knob sequences from CAR-binding viruses indicate that the contact residues are only partially conserved; the capacity to bind receptors is somehow maintained despite sequence variation resulting from immunologic pressures (37). The need for virus to engage CAR and integrins at the same time appears to impose geometric constraints on receptor interactions—evident in structural models (Fig. 2) —so that CAR-binding viruses require fibers that are both long (66, 77) and flexible (101). Although the very short fibers of Ad9 can bind to CAR, Ad9 interaction with cells is not CAR dependent—the penton base may interact directly with an integrin molecule (65). Although the Ad37 fiber binds to isolated CAR protein, Ad37 attachment to cells depends on other receptors (see below). It has been proposed that free adenovirus fibers may facilitate virus spread by disrupting CAR-dependent intercellular junctions (96); this could conceivably occur even with fibers whose length or rigidity does not permit CAR-dependent virus infection.

View larger version (43K): [in this window] [in a new window]   FIG. 2. Geometric constraints on receptor interaction. In panels A and B, attachment of a short fiber (green) to CAR on the cell surface does not permit the penton base protein to interact with a cell surface integrin molecule. In panel C, a virus with a long flexible fiber is able to interact with CAR and integrin at the same time. The figure is modified from Wu et al. (101) with permission.

CD46. Before any specific receptors had been identified, it was observed that Ad3, a group B virus, did not compete for an attachment site with Ads 2 or 5, suggesting that it bound to a different receptor from that used by these group C viruses (23, 85); consistent with this idea, none of the group B adenoviruses tested thus far—Ads 3, 7, 11, and 35—interacts with CAR (9, 66, 73). Further competition experiments suggest that group B viruses interact with at least two receptors. One of these appears to permit attachment by viruses from both groups B1 and B2; a second receptor is postulated to bind only those in group B2 (73).

In the past 2 years, many group B viruses have been shown to attach to CD46 (membrane cofactor protein), a complement regulatory protein expressed on all nucleated human cells (16). The evidence is strongest for Ads 11 (73, 74) and 35 (29), which have been shown to infect cells after attaching to CD46; for Ad3 (80) and the subgroup D virus Ad37 (93, 102), evidence for CD46-dependent infection comes from experiments with Ad5 vectors pseudotyped with Ad3 and Ad37 fibers. Ads 14, 16, 21, 35, and 50 bind to CD46, but infection has not been tested. Because their fibers are virtually identical to those of other CD46 binders, Ads 19a and 34 are also likely to interact with CD46. Both B1 and B2 viruses thus appear to bind to CD46, which may represent the common group B receptor postulated from competition experiments. It is interesting that CD46 functions as a receptor for a number of other pathogens, including measles virus (50), human herpesvirus 6 (71), Streptococcus pyogenes (61), and pathogenic Neisseria spp. (41).

Isolated knob domains block virus attachment to CD46, indicating that the attachment site resides within the knob rather than the fiber shaft (29, 74, 80). Ad35 fiber binds to a membrane-distal fragment of CD46 (30). However, the binding site is not well defined, and it is possible that different viruses attach to different sites within the molecule (74, 102).

CD80 and CD86. Ad3, a virus that can interact with CD46, also enters cells after binding to either CD80 or CD86 (B7-1 and B7-2) (79), distantly related immunoglobulin superfamily members that are expressed on antigen-presenting cells and are best known for their important function in T-cell activation (32). Ad3-mediated transduction of isolated dendritic cells depends on interaction with CD80 and CD86 (79). Replication-defective adenoviruses are being developed as vaccine vectors, and viruses that target receptors expressed on dendritic cells (90) (including CD80/86 and CD46) may prove useful in eliciting strong immune responses. It is not yet known whether other Ad serotypes also interact with CD80 or CD86. Since Ad3 is a member of the B1 subgroup, CD80 and CD86 are unlikely to represent the putative B2-specific receptor, which remains to be identified.

Sialic acid. Several subgroup D viruses (Ads 37, 8, and 19a) (3-5) have been shown to infect cells after attachment to (2-3)-linked sialic acid (SA), a common carbohydrate component of glycoproteins and glycolipids. Crystallographic studies demonstrate that SA binds to a site at the very top of the fiber knob (10); residues potentially involved in SA interaction are conserved in the fibers of all group D viruses. The three viruses known to bind SA all cause conjunctivitis, but it is not clear how attachment to a ubiquitous cell surface molecule could account for a specific tropism for the conjunctiva. As mentioned above, Ad37 also interacts with CD46 (103), and there remains some controversy about whether SA, CD46, or both SA and CD46 contribute to attachment and infection.

Integrins Mß2 and Lß2. In some cases, virus attachment may depend on direct interaction between the penton base and a cell surface integrin, without the need for a primary fiber receptor. Fiber-deficient Ad2 virions can infect CAR-negative monocytic cells by a mechanism that involves a primary attachment to integrins Mß2 and Lß2, followed by an interaction with _v integrins that is needed for internalization (38).

Other protein and nonprotein receptors. The 2 domain of the class I major histocompatibility complex (MHC-I) has been reported to promote high-affinity interaction with Ad5 when expressed on an MHC-deficient human cell line (36). The putative fiber attachment site shows slight sequence similarity to the fiber binding site identified within CAR D1. However, when expressed on hamster cells, MHC-I shows little affinity for Ad5 fiber (20). The role of this ubiquitous protein in Ad infection remains unclear.

Ad5 has also been shown to attach to vascular cell adhesion molecule 1 (VCAM-1), a member of the immunoglobulin gene superfamily expressed on activated endothelial cells (17, 48, 69). Because VCAM-1 is more highly expressed on atherosclerotic endothelium than on normal endothelium, it has been suggested that VCAM-mediated infection may be useful for gene therapy of atherosclerosis (13).

Ad5 hexon interacts with dipalmitoyl phosphatidylcholine (DPPC), a component of pulmonary surfactant, and DPPC liposomes enhance virus uptake by a receptor-independent mechanism (7). It is not known whether interaction with surfactant plays a role in adenovirus infection in vivo.

	RECEPTORS AND TROPISM

 
Anatomic and functional barriers to virus-receptor interaction. Many factors may prevent virus from encountering a receptor on a target cell in vivo. The immune system is probably most important, because patients with immune deficiencies suffer disseminated infections that are rarely, if ever, seen in those with normal immunity (42). The endothelial junctions that constitute the blood-brain barrier may prevent virus from reaching receptors in the central nervous system. Interaction with heparan sulfate or sialic acid may trap virus within the extracellular matrix or within the cellular glycocalyx (63, 87). The precise subcellular location of the receptor may be critical. CAR, which is localized to intercellular junctions, is inaccessible to virus on the apical surface of polarized epithelial cells (14), so that infection of these cells may require disruption of junctions or attachment to another molecule.

Tropism in vivo. Clinical information suggests that specific adenoviruses have tropism for particular organ systems. Because human adenoviruses do not replicate in rodent models, most experimental data come from gene therapy experiments with replication-defective Ad2 and Ad5 vectors. In a typical experiment, a large virus dose (10¹⁰ to 10¹² virus particles) is administered intravenously; this is unlikely to mimic the process of natural infection, which begins when a small virus inoculum attaches to an epithelial surface, replicates locally, and then possibly spreads to the bloodstream.

Transgenic animals in which CAR is broadly overexpressed show increased susceptibility to Ad-mediated transduction of many tissues (88). Tissue-specific CAR expression in transgenic animals markedly increases the susceptibility of skeletal muscle (58) and lymphocytes (40, 72, 97), which are normally CAR deficient and refractory to transduction. Although these results indicate that CAR can influence tropism in vivo, it is certainly not the sole determinant. Experiments with CAR knockout animals (or animals deficient in CD46 or B7) have not been reported, but mice deficient in integrin ß5 (39) or MHC-I (104) expression are susceptible to Ad5, indicating that these molecules are not essential for infection.

After intravenous administration, the vast majority of Ad2 or Ad5 is taken up rapidly by the liver (2, 43, 57, 81); Ad5 pseudotyped with fibers of Ad7 (31) or of subgroup D viruses (24) shows somewhat less hepatotropism. Although CAR is highly expressed in rodent liver, it does not appear that hepatotropism results primarily from virus interaction with CAR. Many investigators have observed that mutations in the fiber knob that reduce or ablate virus attachment to CAR, thus preventing transduction of primary hepatocytes in culture (51, 81), do not greatly affect hepatotropism in vivo (2, 43, 57, 81). In only one study was liver tropism of such a "detargeted" vector significantly reduced (25). Similarly, mutation of the penton base RGD sequence, which prevents interaction with integrins, does not prevent liver tropism. In contrast, mutation of the putative site for interaction with HS-GAG significantly reduces virus delivery to the liver; the results suggest that HS-GAG is more important for tropism than might have been expected from in vitro experiments.

Dual mutations, which are aimed at eliminating interactions with two or more of the receptors, may be more effective than single mutations in "detargeting" the liver. In a rat model, the elimination of the CAR and integrin binding sites together greatly reduced liver transduction (59); however, in some, but not all (25), experiments with mice, a similar combination of mutations had no effect (51, 59).

With multiple receptors and tissue-specific variation in receptor expression, the importance of particular receptors may vary as different tissues are examined and may depend on the route by which virus is administered. For example, when virus is injected into the brain, tropism for specific cell populations depends on interaction with CAR; little transduction is seen with vectors that bind neither CAR nor integrins (91). The complex results of gene therapy experiments suggest that each of the receptors is likely to play some role in vivo, but our present understanding of virus-receptor interaction does not permit us to predict with confidence whether a particular tissue will be efficiently transduced.

	WHERE WE ARE NOW

 
Because adenoviruses use different receptors for entry and internalization, attachment to any of a number of cell surface molecules may lead to virus infection. In the past few years, information about these receptor molecules has accumulated rapidly, but a number of important issues remain to be clarified. For many of the Ad serotypes, no specific receptor has yet been identified, and it is likely that additional receptors remain to be found. The structural details of how viruses interact with a number of the identified receptor molecules remain to be defined. We do not know whether virus interaction with receptors such as CD46 or B7 triggers signals that may be involved in pathogenesis.

A major focus of research in adenovirus-mediated gene therapy is the effort to design vectors that deliver genes to specific tissues or cell types (8, 98). Successful targeting will require reducing the toxicity of the available vectors, eliminating unwanted hepatotropism, and promoting interaction with alternative receptors whose tissue distribution is more limited than that of CAR, CD46, heparan sulfate, or sialic acid.

Ten years ago, it seemed that identification of the adenovirus receptor would put us well on our way toward targeted gene delivery, but the factors governing tissue tropism are quite complex. A virus may use different receptors or combinations of receptors in its interaction with various cell types or under different circumstances. For example, hematogenous spread to a tissue may involve different receptors from those needed for contiguous spread from cell to cell. Experiments using "detargeted" virus mutants, complemented by experiments with genetically modified animals, may be useful in teasing out the contributions of individual receptor molecules. However, given that human adenoviruses replicate poorly in animals, an understanding of the factors that govern tropism during a natural infection is likely to require new experimental approaches.

	ACKNOWLEDGMENTS

 
This work was supported by grants from the National Institutes of Health.

We thank Glen Nemerow for helpful comments on the manuscript. We also thank Carmen San Martin and Roger Burnett for providing the unpublished cryo-EM structure shown in Fig. 1A and Stephen Cusack and Glen Nemerow for permission to reproduce published figures.

	FOOTNOTES

 
* Corresponding author. Mailing address: ARC 1202E, 3615 Civic Center Boulevard, Philadelphia, PA 19104. Phone: (215) 590-3771. Fax: (215) 590-2025. E-mail: bergelson{at}email.chop.edu.

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