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Journal of Virology, April 2007, p. 3627-3631, Vol. 81, No. 7
0022-538X/07/$08.00+0 doi:10.1128/JVI.02786-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.
Influence of Coagulation Factor Zymogens on the Infectivity of Adenoviruses Pseudotyped with Fibers from Subgroup D
Alan L. Parker,1
John H. McVey,2
Jessica H. Doctor,1
Oscar Lopez-Franco,1
Simon N. Waddington,3
Menzo J. E. Havenga,4
Stuart A. Nicklin,1 and
Andrew H. Baker1*
British Heart Foundation Glasgow Cardiovascular Research Centre, Division of Cardiovascular and Medical Sciences, University of Glasgow, 126 University Place, Glasgow G12 8TA, United Kingdom,1
Haemostasis and Thrombosis, MRC Clinical Sciences Centre, Imperial College London, Du Cane Road, London W12 0NN, United Kingdom,2
Department of Haematology, Haemophilia Centre and Haemostasis Unit, Royal Free and University College Medical School, London NW3 2PF, United Kingdom,3
Crucell, P.O. Box 2048, 2301 CA Leiden, The Netherlands4
Received 18 December 2006/
Accepted 16 January 2007

ABSTRACT
Recent evidence supports a role for vitamin K-dependent coagulation
zymogens in adenovirus serotype 5 (Ad5, subgroup C) infection
of hepatocytes. Here, we assessed the effect of virus-zymogen
interaction on cellular transduction using a panel of fiber
(f)-pseudotyped viruses derived from subgroup D (f47, f33, f24,
f45, f17, f30). Each virus directly bound factor X (FX) as determined
by surface plasmon resonance, resulting in enhanced cell surface
binding. Infection of HepG2 cells was promoted by FX but not
by FVII or FIX, while transduction of CHO cells was blocked
in heparan sulfate proteoglycan-deficient cells. This suggests
a broad role for FX in adenovirus infectivity.

TEXT
Adenoviral vectors, particularly adenovirus serotype 5 (Ad5,
subgroup C virus), are used routinely for gene therapy in the
experimental setting and are being tested extensively in the
clinical setting. In vitro, Ad5 binds to cells predominantly
through primary interaction with the coxsackie virus and adenovirus
receptor (
3,
18) and internalization through integrin engagement
(
19). The profound in vivo infectivity of Ad5 for the liver
following systemic delivery, however, is dictated by the virus
binding to coagulation zymogens, including factor IX (FIX) (
16)
and FX (
15). This is particularly relevant for understanding
adenovirus infectivity following intravascular administration,
since the virus comes into immediate contact with blood cells
(
14) and circulating proteins. For efficient retargeting of
Ad5-based gene delivery vectors to alternate sites (e.g.,disseminated
cancers, alternate organs, and specific sites of disease that
lack medically achievable surgical access), it is likely that
modulation of this pathway will be required, since binding of
coagulation factors to the virus is efficient (
15). Previous
studies have suggested that the fiber is the major determinant
of FIX binding to the capsid (
16). A simple method, therefore,
to alter susceptibility to coagulation factor binding may be
to use fibers derived from alternate serotypes and pseudotyped
onto the Ad5 capsid. Shayakhmetov and coworkers demonstrated
that Ad5 capsids possessing the fiber of serotype 35 (subgroup
B) showed enhancement of cell infection mediated by FIX (
16).
Subgroup D-based Ads, either as pseudotyped viruses or as complete
serotype viruses, are being developed for a variety of clinical
applications, including targeted in vivo gene delivery and vaccination
(
5,
12). Additional virological importance may be assigned to
coagulation factor binding, since adenovirus infections are
relatively common (and heterogeneous with respect to adenovirus
subgroups, including subgroup D) in immunocompromised patients
(
13). Many of the receptors for adenoviruses from this subgroup
remain to be isolated, and those that have been characterized
often bind with relatively low affinity (
1,
2,
4,
5). Since
virus exposure to the blood and hence dissemination may occur
in a number of such applications, it is important to assess
coagulation factor binding capacity. We documented this capacity
by using a panel of luciferase-expressing Ad5 vectors pseudotyped
with fibers from subgroup D, including f17, f24, f30, f33, f45,
and f47 (see Fig.
1A for a phylogenetic depiction) (
7-
9).
We first screened viruses for coagulation factor binding by
using surface plasmon resonance. We used biosensor chips with
immobilized FX or FXI (negative control) (
15). All viruses bound
to FX but not to FXI (see Fig.
1B for Ad5/f45 as an example).
In each case, and consistent with previous data for Ad5 (
15),
no dissociation of virus from FX was observed until 3 mM EDTA
was added, indicating a strong and calcium-dependent interaction
with FX (see Fig.
1B for Ad5/f45 as an example). This demonstrates
that all viruses evaluated directly bind to FX.
We next sought to determine whether physiological concentrations of FX could influence HepG2 cell binding and transduction mediated by each pseudotyped adenovirus in vitro. Previously we have used this in vitro model as a reproducible model system to examine the effect of coagulation factors on human cell transduction (15). We exposed cells and viruses to physiological concentrations of FX (10 µg/ml, 1 IU/ml) in serum-free medium for 1 h at 4°C (for cell binding studies) or for 3 h at 37°C followed by incubation for 72 h (for transduction studies). All subgroup D fiber-pseudotyped vectors showed a significant increase in cell binding (Fig. 2A) and subsequent transgene expression (Fig. 2B) in HepG2 cells in the presence of FX, ranging from a 3.7-fold increase in transduction in the presence of FX for serotype Ad5/f30 to a 24.9-fold increase for Ad5/f33 (Fig. 2B). This demonstrates that physiological FX concentrations substantially enhance cell binding and transduction of HepG2 cells mediated by each subgroup D fiber-pseudotyped virus.
To further investigate the effect of other coagulation factors
with the

-carboxyglutamic acid-epidermal growth factor-like
(EGF)-EGF-serine protease domain structure on virus transduction,
we transduced HepG2 cells with a subset of viruses, Ad5/f47,
Ad5/f33, and Ad5/f30, in the presence of physiological concentrations
of FVII, FIX, FX, or FXI (negative control) (Fig.
3). All reagents
were purified proteins obtained from Hematological Technologies,
Ltd., except FVII, which was recombinant (
15). All subgroup
D-pseudotyped viruses showed a substantial enhancement of HepG2
cell transduction in the presence of FX but not with FVII, FIX,
or FXI (Fig.
3). The lack of effect of FVII and FIX was surprising
based on previous observations for Ad5 (
15,
16) and for the
subgroup B Ad35 (
16). Although further experiments may be required
to assess direct interactions of individual coagulation factors
and each virus as well as recombinant forms of FIX, these data
do suggest potential subgroup-specific differences in fiber-coagulation
factor interactions.
We hypothesized that the increase in transduction mediated through
FX would be via an interaction with heparan sulfate proteoglycan
(HSPG), as observed for Ad5 (
15,
16); therefore, CHO cell infections
were performed for each virus. CHO-K1 cells (wild type) express
HSPGs, whereas CHO-pgsA745 cells have been genetically modified
to be deficient in polymerization of HSPGs and therefore have
no cell surface expression (
6). In each case, physiological
levels of FX enhanced transduction in CHO-K1 cells (Fig.
4).
However, this level was significantly reduced for CHO-pgsA745
cells (Fig.
4). Therefore, for subgroup D fiber-pseudotyped
viruses that show an enhancement in cell binding and transduction
through FX, the virus is targeted through HSPG, consistent with
the mechanism of retargeting of Ad5 (
15,
16). It is noteworthy
that the putative HSPG binding site in the third pseudorepeat
of the Ad5 fiber (
17) is not present in any of the pseudotypes
here. However, we recently demonstrated that Ad5 fibers mutated
at this site (KKTK motif) show efficient binding to FX (
11).
Taken together, these data suggest that Ad5 and subgroup D fiber-pseudotyped
Ads that are responsive to FX mediate enhanced cell transduction
through retargeting to HSPG on the cell surface. This suggests
that coagulation factors play a broad role in dictating adenovirus
tropism when exposure to blood occurs, since subgroup C- (
15,
16), subgroup B- (
16), and now subgroup D-based viruses are
all sensitive to FX binding. This is in contrast to a recent
finding that Ad5 (and other subgroup C viruses) but not representative
viruses from all other subgroups used lactoferrin as a bridge
for coxsackie virus and adenovirus receptor-independent transduction
of A549 cells (
10). This demonstrates that research into coagulation
factors and other proteins that can target the Ad capsid proteins
in vivo (either following localized exposure in the case of
tear fluid and lactoferrin [
10] or via exposure to the bloodstream)
is warranted, since this has fundamental implications for receptor
utilization and infectivity in vivo.

ACKNOWLEDGMENTS
This work was supported by the European Commission and Biotechnology
and Biophysical Research Council for funding support. The Haemostasis
and Thrombosis department is supported by the Medical Research
Council. S.N.W. is a Philip Gray Memorial Fellow, Katharine
Dormandy Trust.
We thank Nicola Britton and Gregor Aitchison for technical assistance.

FOOTNOTES
* Corresponding author. Mailing address: British Heart Foundation Glasgow Cardiovascular Research Centre, Division of Cardiovascular and Medical Sciences, University of Glasgow, 126 University Place, Glasgow G12 8TA, United Kingdom. Phone: 44 141 330 1977. Fax: 44 141 330 6997. E-mail:
ab11f{at}clinmed.gla.ac.uk.

Published ahead of print on 24 January 2007. 

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Journal of Virology, April 2007, p. 3627-3631, Vol. 81, No. 7
0022-538X/07/$08.00+0 doi:10.1128/JVI.02786-06
Copyright © 2007, American Society for Microbiology. All Rights Reserved.
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