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Journal of Virology, September 2000, p. 8207-8212, Vol. 74, No. 17
Program in Immunology, Fred Hutchinson Cancer
Research Center,1 and Department of
Pediatric Hematology and Oncology2 and
Departments of Immunology and Medicine,3
University of Washington, Seattle, Washington
Received 22 February 2000/Accepted 7 June 2000
The introduction of genes encoding T-cell receptor (TCR) chains
specific for human immunodeficiency virus into T cells of infected
patients represents a means to quantitatively and qualitatively improve
immunity to the virus. Our results demonstrate that the high level of
TCR expression required for physiologic functioning can be reproducibly
achieved with retroviral vectors encoding full-length unmodified TCR
chains under the control of a strong internal constitutive
phosphoglycerate kinase promoter.
The importance of the
CD8+ cytotoxic-T-lymphocyte (CTL) response for containment
of human immunodeficiency virus (HIV) infection has been suggested by
the temporal association of the emergence of the HIV-specific
CD8+ CTL response following primary infection with
clearance of viremia (7, 12, 25, 27, 37), the inverse
correlation between the magnitude of the HIV-specific CTL response
during the chronic phase and plasma viral load (28), and the
correlation between maintenance of the long-term nonprogressor state as
well as the asymptomatic phase of infection with the presence of a
strong CD8+ CTL response (4, 24). Direct
evidence has been provided in studies with macaques infected with
simian immunodeficiency virus in which in vivo depletion of
CD8+ T cells led to a burst of viremia followed by disease
progression (22, 38).
Our laboratory has used the adoptive transfer of CD8+ CTL
clones expanded ex vivo as a means of augmenting antiviral responses in
immunocompromised hosts to a magnitude not achievable by the damaged
endogenous immune system (33, 34, 35, 39). Transferred CD8+ T cells specific for HIV Gag migrate to areas of viral
infection in lymph nodes and mediate in vivo antiviral activity
(8, 9). However, there are several obstacles to the general
application of this approach. It is often difficult to isolate CTL from
individuals with advanced disease with expended CTL responses
(10), as well as individuals receiving prolonged therapy
with highly active antiretroviral therapy, due to the fall in precursor
frequency of CTL to HIV following the reduction in viral burden
(2). Additionally, the T cells that can be isolated from
infected individuals are often terminally differentiated and difficult
to expand and may fail to recognize HIV variants with escape mutations
no longer recognizable by the dominant CTL response (3, 10, 20,
21, 24, 30).
These problems have previously been addressed by genetically modifying
CD8+ T cells that are not HIV specific with chimeric
receptors using antibody ectodomains or CD4 receptor domains coupled to
the Introduction of full-length TCR chains specific for a desired HIV
antigen into primary CD8+ T cells represents an alternative
strategy to target selected viral epitopes that takes advantage of the
native affinity, MHC-peptide binding property, and intracellular
signaling qualities inherent in a correctly assembled TCR. A potential
obstacle to this approach has been the magnitude of TCR surface
expression required to deliver an effective signal, as the introduced
chains must not compete with the endogenous TCR chains for the
components of the TCR complex necessary for complete assembly and
export to the cell membrane.
A CD3+, CD4 The full-length V
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Transfer of Specificity for Human Immunodeficiency Virus Type
1 into Primary Human T Lymphocytes by Introduction of T-Cell
Receptor Genes


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chain. Such receptors universally recognize cells infected with HIV independent of major histocompatibility complex (MHC) phenotype (36, 40), but they have some disadvantages compared with
native T-cell receptor (TCR) recognition of MHC and peptide. These
disadvantages include delayed T-cell dissociation from bound gp120 HIV
envelope (Env) leading to apoptosis (16), binding of
circulating antigen shed from the membrane leading to blockage of
target recognition and/or inappropriate activation (6),
inclusion of murine antibody or novel fusion sequences which may lead
to an immune response targeted against the chimeric molecule, emergence
of viral mutations leading to decreased affinity to CD4
(23), and the lack of complete assembly of all the component
chains of the multimeric TCR complex, which may be essential for
delivery of fully competent activation and survival signals
(18).
, CD8+ HIV
Gag-specific T-cell clone, 52H8, bearing the TCR chains V
2.3 and
V
3.1 was cloned from the peripheral blood mononuclear cells of an
HLA A3+ HIV-seropositive volunteer by using previously
described methods (8). The A3-restricted epitope recognized
by 52H8 was localized to p17 Gag protein by screening targets
expressing each of the individual proteins comprising full-length HIV
Gag, and the peptide epitope was mapped by pulsing Epstein-Barr
virus-transformed B-lymphoblastoid cell (LCL) targets with synthetic
overlapping peptides corresponding to the sequence of p17 from the SF2
strain of HIV. The minimal epitope was demonstrated to be RLRPGGKKK
(amino acids 20 through 28 of p17) (data not shown).
2.3 and V
3.1 TCR genes were cloned error-free
into retroviral plasmids derived from pLNSX (26) to generate pLN · PgkV
3.1 and pLH · PgkV
2.3, respectively (Fig.
1). The internal simian virus 40 (S)
promoter was replaced with a constitutive promoter derived from the
murine phosphoglycerate kinase (Pgk) gene (1), based upon
initial experiments demonstrating higher reporter gene expression in
primary T cells compared to the long terminal repeat (LTR) or internal
simian virus 40 and cytomegalovirus promoters (data not shown). The
plasmids contained either the neomycin phosphotransferase (N) gene
under the control of the LTR (L) or the hygromycin phosphotransferase
gene (H) to permit independent selection of the two inserted genes.

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FIG. 1.
Schematic of the approximately 6-kb proviral plasmids
pLH · PgkV
2.3 and pLN · PgkV
3.1 derived from the
Moloney leukemia retrovirus backbone. The V
2.3 and V
3.1 TCR
chains under the transcriptional control of an internal Pgk promoter
were cloned into a multiple cloning site (MCS) comprised of the unique
AvrII, HindIII, and ClaI (not
blocked by overlapping dam methylation) sites. The plasmids
contain either the hygromycin B (Hygro) or neomycin (Neo)
phosphotransferase genes expressed from the 5' LTR. The arrows indicate
the direction of transcription, pA indicates the polyadenylation
signal, and
+ indicates the packaging signal.
To facilitate transduction of human T cells, the proviral vectors were
packaged in PG13 cells, which express the gibbon ape leukemia virus
env gene, and clones of PG13 producing LN · PgkV
3.1 and LH · PgkV
2.3 virus at approximately
105 CFU/ml were selected. Peripheral blood mononuclear
cells from an HLA A3-positive HIV-seronegative volunteer were
stimulated with anti-CD3 (OKT3; Ortho Biotech, Raritan, N.J.)
(32) and transduced by cocultivation with PG13 cells
producing LH · PgkV
2.3 virus. Hygromycin B-resistant
CD8+ T cells were sorted for expression of V
2.3, and
high expressors were transduced with PG13 cells producing
LN · PgkV
3.1. T cells resistant to G418 were
stimulated with autologous irradiated LCL pulsed with the peptide
RLRPGGKKK to select T cells expressing a functional TCR. Wells
demonstrating growth in response to antigen were cloned by limiting
dilution. Twenty-four CD8+ T-cell clones were analyzed for
expression of the introduced TCR chains by staining with anti-V
2.3
and anti-V
3.1 monoclonal antibodies. In all clones the surface
expression of V
2.3 approximated the level observed in the parental
52H8 clone, whereas expression of V
3.1, which had not been used as a
selection criteria by flow cytometry, was heterogeneous. Several sets
of transduced T-cell clones expressing in comparison to the parental
clone 52H8 either equivalent (wild type), intermediate, or low surface
levels of the introduced TCR V
3.1 chain were selected for further
study (Fig. 2). The stability of TCR
surface expression in the different categories of clones in the absence
of selective pressure by specific antigen stimulation or drug selection
was assessed. Over a 21-week monitoring period, in which the cells were
stimulated every 14 to 21 days with anti-CD3, surface levels of V
2.3
and V
3.1 chains remained unchanged (data not shown).
|
The influence of the level of TCR expression in the panel of transduced
CD8+ T-cell clones on antigen recognition was assessed by
lysis of HLA A3+ LCL targets expressing the HIV Gag epitope
in a chromium release assay (CRA) (Fig.
3). The targets were exogenously loaded
with 5 µM RLRPGGKKK peptide or infected with vaccinia virus Gag or with a control vaccinia virus immediate-early recombinant expressing the 72-kDa immediate-early protein from cytomegalovirus
(19). Clones expressing levels of the introduced TCR chains
similar to the parental clone 52H8 exhibited near-equivalent lysis of targets presenting the Gag epitope. T cells expressing an intermediate level of the introduced TCR chains exhibited a reduction in the ability
to lyse targets expressing HIV Gag, which was further reduced in T
cells expressing low levels of the introduced TCR chain pairs. Since
T-cell accessory, adhesion, and signaling molecules can influence the
avidity and cytolytic activity of a T cell for its target, the
expression of CD28, CD11a, CD29, CD8, and TCR-
was determined by
flow cytometry with fluorescein-conjugated antibodies. The parental
clone, 52H8, and the transduced clones expressing variable levels of
the introduced TCR chains did not differ in expression of these
molecules (data not shown). To confirm that the specificity of the
transduced T cells was dependent on the expression of the
antigen-specific TCR, antibody specific for the TCR chains was used to
block target recognition. The lysis of HLA A3+ LCL targets
expressing the HIV Gag peptide was inhibited by antibody specific for
either the V
2.3 or V
3.1 chain, whereas an antibody against an
irrelevant V
8 chain had no effect (data not shown).
|
The amount of HIV antigen presented by HIV-infected cells can vary,
particularly since HIV infection results in down-regulation of class I
MHC molecules (15; D. A. Lewinsohn, S. R. Riddell, P. D. Greenberg, M. Emerman, and S. R. Bartz,
unpublished data). To examine recognition of target cells with
different antigen densities, HLA A3+ LCL were coated with a
range of concentrations of the HIV Gag peptide. At all antigen
densities the cytolytic activity of the transduced T-cell clones
correlated with the level of TCR surface expression (Fig.
4). Transduced CD8+ T cells
which expressed levels of the introduced TCR chains equivalent to the
parental clone exhibited similar lytic activity even at the lowest
peptide concentrations. T cells expressing diminished levels of the
introduced TCR chains exhibited reduced capacity to lyse targets, which
became increasingly prominent when the target antigen density was
reduced.
|
Vaccinia virus infection or peptide loading of targets might provide
higher levels of epitope presentation than those obtained with HIV
infection. Thus, recognition of HIV-infected targets by transduced CTL
and clone 52H8 was directly assessed by infecting HLA A3+
CD4+ Jurkat cells with an env-deleted HIV-1
provirus (pBru3
env) pseudotyped with the vesicular stomatitis virus
envelope glycoprotein (5) to achieve infection of a high
proportion of Jurkat cells. The parental clone 52H8 and CTL clones
expressing the introduced TCR genes lysed Jurkat cells infected with
HIV type 1 but did not lyse uninfected Jurkat cells (Fig.
5). The level of surface expression of
the introduced TCR chains again correlated with lytic activity, with
clones expressing wild-type levels of the TCR chains demonstrating activity equivalent to that of the parental clone.
|
TCR chains have previously been successfully introduced into hybridomas (14, 31), and recently TCR chains specific for a melanoma antigen were transferred into human peripheral blood lymphocytes (13). However, a large fraction of these genetically altered melanoma-specific T cells recognized peptide-loaded targets but failed to recognize melanoma tumor cells. Our results suggest that this discrepancy in target recognition is likely the consequence of variable levels of TCR expression and a predictably lower epitope density on tumor targets than peptide-loaded targets. Moreover, by employing a strong constitutive promoter, such as Pgk, wild-type levels of TCR expression can be reproducibly achieved.
Expression of the introduced receptors is apparently not substantially
limited by endogenous
chain expression required for assembly of the
multimeric TCR complex and export to the cell surface. This result is
supported by recent studies with mice in which two functional
transgenic TCRs were expressed in mature T cells (17).
However, it is possible that some of the surface expression of the
introduced TCR chains reflects alternative pairing with the reciprocal
endogenous TCR chains. Such receptors would not have been subjected to
developmental selection and could rarely be autoreactive. Our detection
of clones expressing higher levels of the introduced V
than V
confirms that such alternative pairing does occur. This problem could
potentially be overcome either by transducing clones that do not
express the V
or V
chain when inserted alone or by modifying the
TCR chains to contain tails with heterodimeric leucine zipper motifs to
promote pairing (11, 29).
The potential to transfer TCRs with known specificity for HIV epitopes into autologous primary T cells offers a means of providing desired effector CD8+ T-cell responses to a broad range of individuals. Improved understanding of the molecular virology of HIV and increased mapping of T-cell epitopes should make it possible to ultimately provide potent T-cell responses targeting portions of the HIV genome that are essential to the virus and cannot mutate and lead to escape variants.
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ACKNOWLEDGMENTS |
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This work was supported in part by grants from the National Institutes of Health (CA18029, AI43650, CA33084, AI27757, and HD28834) and fellowship support from the Leukemia and Lymphoma Society of America (L.J.N.C.), by NIH training grant CA09351 (L.J.N.C.), and by the Cancer Research Institute (M.K.).
We thank Jenny Joyce and Brian Macintosh for technical assistance.
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FOOTNOTES |
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* Corresponding author. Mailing address: Fred Hutchinson Cancer Research Center, D3-100, 1100 Fairview Ave. North, P.O. Box 19024, Seattle, WA 98109-1024. Phone: (206) 667-3428. Fax: (206) 667-7983. E-mail: lcooper{at}fhcrc.org.
Present address: Corixa Corporation, Seattle, WA 98104.
Present address: Department of Pediatrics, Oregon Health Sciences
University, Portland, OR 97201.
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