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Cutting Edge |


Laboratories of
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Tumor Immunology, and
Immunobiology, Pacific Northwest Research Institute, Seattle, WA 98122
| Abstract |
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| Introduction |
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To study CD83 function, we have constructed two fusion proteins of the extracytoplasmic domain of human CD83, one with a human IgG1 tail (4) and the other with a mouse IgG2a tail. We also retrotransfected mouse and human cell lines with human CD83. We now show that a soluble CD83-Ig fusion protein is immunosuppressive, both when tested with human cells in vitro and with mouse cells in vivo. We also demonstrate that CD83-Ig is costimulatory when coimmobilized with anti-CD3 and that cells from a mouse melanoma of low immunogenicity (K1735) transfected with CD83 induce a tumor rejection response against wild-type K1735 cells.
| Materials and Methods |
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Six- to 8-wk-old normal female C3H and DBA/2 mice were purchased from Harlan Sprague-Dawley (Indianapolis, IN).
C3H mice were implanted s.c., on one side of the back, with 2 x 106 wild-type K1735 cells (K1735-WT) or with K1735 cells retrotransfected to express CD83 (K1735-CD83). In some experiments, mice were implanted 4 wk later with 2 or 4 x 106 K1735-WT cells. Tumor growth was monitored daily and mice were sacrificed when the tumor surface reached 100 mm2.
DBA/2 mice were implanted s.c. on one side of the back with 107, 1 x 106, or 500 P815 cells and injected i.p. with 100 µg of CD83-murine Ig fusion protein (CD83-mIg), 1, 3, and 6 days after tumor implantation. Tumor growth was monitored daily and animals were sacrificed when the tumor surface reached 100 mm2. All in vivo experimental protocols were approved by the Pacific Northwest Research Institute Committee for Use and Care of Laboratory Animals (Seattle, WA). The Pacific Northwest Research Institute animal facilities are American Association of Laboratory Animal Care accredited.
Tumors and cell lines
For in vivo experiments, we used the highly immunogenic mouse mastocytoma P815 (DBA/2 origin) and the M2 clone of the poorly immunogenic mouse melanoma K1735 (C3H origin) (7), referred to in this study as K1735-WT. The K1735-WT cells were retrotransfected with human CD83 using previously described techniques (4) and are referred to as K1735-CD83.
For in vitro experiments, we used cells from human B lymphoblastoid line T51 (8) and T51 cells that had been retrotransfected with human CD83 as previously described (4) and referred to as T51-CD83. In addition, we used mouse EL4 (9) cells, as well as NK-sensitive human K562 (10) and mouse lymphoma YAC-1 cells (11).
Purification of PBMCs and T cells
A freshly harvested mouse spleen was minced and the suspended cells were filtered through a cell strainer (BD Biosciences, Franklin Lakes, NJ), after which the splenocytes were separated on Ficoll-Hypaque gradients (Lympholyte-M; Cedarlane Laboratories, Westbury, NY).
Human PBMC (510 x 107) were isolated as previously described (4). For experiments involving T cell activation, PBMCs were resuspended in RPMI medium and T cells were separated from APC by two rounds of adherence to nylon wool columns (12).
Flow cytometry, mAbs, fusion proteins, and CSFE labeling
Labeling for flow cytometry was conducted at 4°C in DMEM (Life Technologies, Grand Island, NY) supplemented with 5% FCS without azide (referred to as DMEM). Anti-human CD3 (64.1) (13), anti-human and mouse CD4, and anti-human and mouse CD8 mAbs were bought from BD PharMingen (Lexington, KY). A CD83-human Ig fusion protein (CD83-hIg) was made as previously described (4). A CD83-mIg was generated similarly to its human counterpart, by cloning a murine tail (14) in the place of the human one. CFSE was bought from Molecular Probes (Eugene, OR) and stored desiccated at -30°C in DMSO. Cells were incubated 15 min at 37°C before they were used for in vitro tests (15).
Proliferation assays
PBMC or spleen cells were cultured using a standard medium (referred to as "RPMI medium"), which consisted of RPMI 1640 (Life Technologies) supplemented with glutamine (1%; Life Technologies), penicillin/streptomycin (1%; Life Technologies), and 10% FCS (Atlanta Biologicals, Norcross, GA).
U-bottom 96-well plates (Corning Glass, Corning, NY) were coated with 50 µl of 1 µg/ml of anti-CD3 (64.1), alone or in combination with 10 µg/ml of CD83-Ig or anti-CD28 (9.3) for 2 h at 37°C. Wells were washed with PBS and cells were plated in triplicate at 106, 5 x 105, 2.5 x 105, and 1.25 x 105 cells/ml. As controls, cells were incubated with medium only or with PHA 1 µg/ml (Sigma-Aldrich, St. Louis, MO).
After 3 days, the cells were pulsed with 1 µCi of tritiated thymidine for 7 h and the incorporated radiolabeling was counted with TopCount NXT counter (Packard Instrument, Meriden, CT).
Cytotoxicity assays
PBMC were first stimulated for 7 days in the presence of wild-type T51 (T51-WT) or T51-CD83. To prevent the proliferation of the stimulatory cells, both T51-WT and T51-CD83 were incubated with 100 µg/ml of mitomycin C (Sigma-Aldrich) for 1 h at 37°C in PBS. In some experiments, CD83-hIg 10 µg/ml was added after 3 days of incubation. Target cells were labeled 1 h at 37°C with 51Cr, washed two times, and plated at 1 x 104 cells/ml in V-bottom 96-well plates (Corning Glass). Effector cells were washed and incubated with the target cells at an E:T ratio of 1:100, 1:50, 1:25, and 1:12.5 for 4 h, in culture medium. Subsequently, 40 µl of supernatant was collected and 51Cr release was measured using chemoluminescence on a TopCount instrument. The percentage of lysis was calculated from the formula: 100 x (E-M)(T-M), where E is the experimental release, M is the spontaneous release in the presence of medium alone, and T is the maximum release in the presence of 2% Triton X-100.
| Results |
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Two sets of mouse experiments were first performed to explore
whether CD83 may have an immunoregulatory function in vivo. CD83-hIg
and CD83-mIg were tested for their ability to bind to mouse cells by
comparing the binding of PBMC, splenocytes, and lymphocytes from
lymph nodes by flow cytometry as previously described (4).
We found that CD83-Ig bound to 90% of monocytes in peripheral blood,
to <5% of lymphocytes from lymph nodes and to
15% of a non-T cell
population of splenocytes.
Based on this observation, two different approaches were taken. First,
we implanted immunogenic P815 tumor cells and subsequently injected
mice i.p. with CD83-mIg, as described in Material and
Methods. Fig. 1
A shows
that in groups receiving CD83-mIg, tumors were two times larger than
those in control mice (p < 0.05). In addition,
tumors in mice receiving CD83-mIg grew along the needle trajectory and
their draining lymph nodes were enlarged (data not shown). A repeat
experiment was performed in which 14 mice were implanted with
106 P815 cells, with 7 mice injected with
CD83-mIg (3 x 100 µg) and 7 mice injected with PBS as controls.
Also in this experiment, tumors grew approximately twice as fast in
mice given CD83-mIg. Fig. 1
B shows that lysis of P815 cells
by splenocytes from CD83-mIg-treated mice, harvested 15 days after the
onset of the experiment, was significantly lower
(p < 0.05) than lysis by splenocytes
from the PBS controls.
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To test whether immobilized CD83 could affect proliferation of
human T cells, fresh human PBMC were incubated at 37°C in plastic
wells onto which 10 µg/ml of CD83-Ig was coimmobilized with 1 µg/ml
of anti-CD3 mAb. CD83-Ig coimmobilized with anti-CD3 mAb
rapidly induced a strong proliferation of the PBMC, while anti-CD3
mAb alone induced a much lower proliferation, and CD83-Ig alone had no
effect (Fig. 3
A). When
adherent cells were removed from the PBMC population by passage through
a nylon wool column, PHA proliferation decreased 3-fold, while
proliferation in response to anti-CD3 plus anti-CD28 increased.
In contrast, no proliferation was observed in the presence of
coimmobilized anti-CD3 plus CD83-Ig (Fig. 3
B).
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To determine what cell population(s) proliferated at an increased
level by coimmobilized anti-CD3 and CD83-Ig, human PBMC were
labeled with CFSE before stimulation. Fig. 4
shows that the ratio of
CD8+ T cells to CD4+ T
cells increased by 2.5 when CD83-Ig was coimmobilized with
anti-CD3. In addition, CD8+ T cells were
engaged in more cell cycles than CD4+ T cells
during an anti-CD3/CD83-Ig stimulation as compared with an
anti-CD3 stimulation alone.
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To further explore CD83 costimulatory signals, CD83 was expressed
at the surface of cells from the T51 lymphoblastoid B cell line as
demonstrated in Fig. 5
A;
T51-WT cells did not express CD83. Both T51-WT and T51-CD83 expressed
high levels of MHC class I and II and CD80 and CD86 (data not shown).
T51-WT and T51-CD83 cells were compared for their ability to stimulate
allogeneic PBMC in a MLR. Fig. 5
B shows that exposure of
PBMC to T51-CD83 dramatically increased their proliferation, as
compared with exposure to T51-WT cells.
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| Discussion |
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We first observed that soluble CD83-mIg significantly enhanced the growth of transplanted P815 tumor cells in mice and decreased the cytotoxicity of spleen cells from mice injected with CD83-mIg against P815 cells. We also found that expression of (human) CD83 at the surface of cells from mouse melanoma K1735, whose immunogenicity is very low, prevented their ability to form tumors and made them capable of inducing an immune response causing the rejection of transplanted K1735-WT cells in five of eight mice and slowing the tumor growth rate in two other mice. We tentatively conclude that interaction between CD83 and its ligand(s) may be involved in regulation of immune response to tumor.
To study the functional aspects of CD83-ligand interaction we also performed a series of in vitro experiments with human PBMC. We first demonstrated that coimmobilization of CD83-Ig with anti-CD3 induced a proliferative response, particularly by CD8+ T cells, and that removal of host cells adherent to nylon wool (most likely monocytes) obliterated this response while it slightly increased proliferation of the T cells in the presence of coimmobilized anti-CD3/anti-CD28 mAbs.
In a second set of experiments, we transfected cells from the B lymphoblastoid T51 line to express CD83 at their surface. This line was chosen because it expresses a high level of MHC class I and II, as well as CD80 and CD86. T51 cells expressing CD83, when compared with T51-WT cells, preferentially induced proliferation of CD8+ T cells and significantly increased the generation of a cytolytic response to T51 cells when combined in MLR cultures. Notably, the addition of soluble CD83-Ig during the incubation of the PBMC with the T51-CD83 abrogated the generation of cytotoxicity.
CD83-Ig does not bind to human resting T cells (4), while it binds to monocytes. Therefore, it is not surprising that when adherent cells were removed from PBMC, the combination of anti-CD3 with CD83-Ig did not induce T cell proliferation, while removal of the adherent cells increased the proliferation triggered by immobilized anti-CD3 and anti-CD28 and decreased the PHA proliferation by a factor of 3, which is in agreement with published data (16, 17, 18). The in vitro activity of immobilized CD83 thus depends on the presence of adherent cells, most likely monocytes. We conclude that an interaction between CD83 and its ligand(s), primarily expressed on resting monocytes, plays an important role in the generation of cell-mediated immune responses. We speculate that this interaction facilitates the differentiation of monocytes into functional APC.
Interestingly, we have noticed in the presence of immobilized CD83-hIg, a down-regulation of CD14 expression by adherent cells and the appearance of collagen-positive, fibroblast-like cells with morphology reminiscent of fibrocytes (19, 20) (N. Scholler, unpublished observations). The regulatory processes that govern the differentiation of blood-borne fibrocytes are still unclear (21) and our data suggest that binding of CD83 to monocytes may facilitate their differentiation into fibrocytes (and maybe other cells that can present Ag, including DC); this will be the subject of further studies.
| Footnotes |
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2 Address correspondence and reprint requests to Dr. Nathalie Scholler at the current address: Seattle Genetics, 21823 30th Drive SE, Bothell, WA 98021. E-mail address: nscholler{at}seagen.com ![]()
3 Abbreviations used in this paper: DC, dendritic cell; CD83-mIg, CD83-murine Ig fusion protein; CD83-hIg, CD83-human Ig fusion protein. ![]()
Received for publication December 19, 2001. Accepted for publication January 28, 2002.
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