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CUTTING EDGE |
Department of Immunology, Schering-Plough Research Institute, Kenilworth, NJ 07033
| Abstract |
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inducible protein 10 and monokine induced
by IFN-
. Nonetheless, human 6Ckine has not been shown to bind
CXCR3 receptor or have angiostatic activity. In this study, we report
that human 6Ckine does not induce a calcium flux in either human CXCR3
or mouse CXCR3 transfected cells, although it is an equally potent
agonist as mouse 6Ckine and human macrophage inflammatory
protein-3ß in human CCR7 transfected cells. Mouse 6Ckine (but
not human 6Ckine) is capable of competing with radiolabeled IFN-
inducible protein 10 for human CXCR3. In addition, radiolabeled human
6Ckine does not bind to either human CXCR3 or mouse CXCR3. Together
these data suggest that human CC chemokine 6Ckine is not a ligand for
the human or mouse CXC chemokine receptor CXCR3. | Introduction |
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inducible protein 10 (IP-10) and
monokine induced by IFN-
(MIG), were initially identified
because of their dramatically enhanced expression in monocytes
activated by IFN-
or LPS (5). IP-10 and MIG have also been shown to
be strongly angiostatic (6). Recently, CXCR3 was identified to be the
receptor for IP-10 and MIG (7). By Northern blot analysis, the RNA for
CXCR3 is highly restricted to activated T cells and NK cells.
Therefore, IP-10 or MIG signaling appears to be an important mechanism
for selective homing of activated/effector cells, which are known to
accumulate preferentially at inflammatory sites (8), as well as in many
tumors. A novel CC chemokine, 6Ckine, with an unusual pattern of six conserved cysteines was identified using bioinformatics-based searches. Both mouse and human 6Ckine were cloned and are conserved between species (9). Recombinant mouse 6Ckine was expressed and shown to be chemotactic in vitro for thymocytes and activated T cells. Furthermore, mouse 6Ckine was shown to induce a calcium flux in mouse CXCR3-transfected cells, which was reported as an example of a CC chemokine binding to a CXC chemokine receptor (10). More importantly, mouse 6Ckine was also shown to have angiostatic activity, like IP-10 and MIG (known ligands for CXCR3 receptor). Nonetheless, human 6Ckine has not been shown to bind either human or mouse CXCR3 receptors.
With the interest in investigating the ligands that bind to and signal through human CXCR3, we have developed 293EBNA transfectants expressing high level of human CXCR3. Surprisingly, during testing of CXC and CC chemokines we have found and present here that human 6Ckine does not induce a calcium flux in human CXCR3 or mouse CXCR3 transfectants. It has little or no binding to human CXCR3 receptor from cross-competition with IP-10, although mouse 6Ckine has modest affinity. More convincingly, radiolabeled human 6Ckine does not bind to either human CXCR3 or mouse CXCR3 transfectants, although this radiolabeled chemokine binds its known receptor, human CCR7. Thus, 6Ckine may be an example of a chemokine whose receptor utilization exhibits species specificity, i.e., that mouse 6Ckine signals through CCR7 and CXCR3 but human 6Ckine binds to and signals solely through CCR7.
| Materials and Methods |
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All chemokines except human interferon-inducible T cell
chemoattractant (I-TAC) (from Peprotech, Rocky Hill, NJ) were obtained
from R & D Systems (Minneapolis, MN). Human 6Ckine was also obtained
from two other suppliers: Research Diagnostics (Flanders, NJ) and
Peprotech. Radiolabeled IP-10 was from NEN Life Science Products
(Boston, MA).
Cloning of human CXCR3
The cDNA encoding human CXCR3 was cloned by PCR using leukocyte cDNA (Clontech, Palo Alto, CA) as a template. The PCR primers were designed based on the published sequence (7) with incorporated restriction sites and a Kozak consensus sequence. The PCR product was digested with KpnI and NotI and ligated into similarly digested and linearized mammalian expression vector pCEP4 (Invitrogen, Carlsbad, CA). The nucleotide sequences of human CXCR3 were confirmed by automated sequencing using an Applied Biosystems 373A DNA sequencer (Applied Biosystems, Foster City, CA).
Expression of human CXCR3 in 293EBNA cells
293EBNA cells (Invitrogen) were transfected with 10 µg of DNA using a standard calcium phosphate procedure (Stratagene, La Jolla, CA) according manufacturers recommendation. The transfected cells were under selection with 300 µg/ml hygromycin (Boehringer Mannheim, Indianapolis, IN). After 7 days, the surviving colonies were pooled and continued with hygromycin selection. CXCR3 expression was verified by specific binding of radiolabeled IP-10. Fourteen days after the selection, the population was confirmed to be homogenous by FACS using anti-human CXCR3 mAb (R & D Systems). For comparison, 293 cells expressing mouse CXCR3 were obtained from Soto et al. (10).
Radiolabeled IP-10 binding assay
293EBNA cells (200,000 cells/point) expressing human CXCR3 were resuspended in binding buffer (50 mM HEPES, 1 mM CaCl2, 5 mM MgCl2, 0.5% BSA) and incubated with 0.1 nM of radiolabeled human IP-10 in the presence of unlabeled chemokines in 96-well plates. After 2 h at room temperature, plates were spun down and cell pellets were resuspended in binding buffer supplemented with 0.5 M NaCl. Cells were spun through 10% glycerol in binding buffer with 0.5 M NaCl. Cell pellets were frozen in liquid nitrogen, clipped, and counted.
Radiolabeled human 6Ckine binding assay
Radiolabeled human 6Ckine binding assay was performed similarly as described above for radiolabeled IP-10 binding assay with the following modification. A total of 400,000 cells/point were resuspended in binding buffer and incubated with either 0.1 nM or 0.5 nM of radiolabeled human 6Ckine. Similar results were obtained when using radiolabeled human 6Ckine from two different suppliers (NEN and Amersham, Arlington Heights, IL).
Measuring intracellular calcium using the FLIPR system
Parental 293EBNA cells and 293EBNA cells stably transfected with either human CXCR3 or human CCR7 were plated at a density of 80,000 cells per well in 96-well plates 24 h before assay. At the day of the assay, cells were loaded with the dye Fluo-3 in growth media and incubated for 1 h at 37°C. Cells were washed three to four times with HBSS supplemented with 20 mM HEPES and 1% BSA (FLIPR buffer; Molecular Devices, Palo Alto, CA) and left in a final volume of 100 µl of the same solution. A separate plate containing the chemokines at 3x concentrations in FLIPR buffer was put in one chamber of the FLIPR. All FLIPR experiments were conducted with the following conditions: chamber temperature, 35.7°C; laser power, 300500 mW; exposure of 0.4 s; sample addition after data point ten. Data points were collected as follow: 60 samples at 1-s intervals followed by 20 samples at 6-s intervals.
| Results and Discussion |
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Because IP-10, MIG, and mouse 6Ckine were identified as ligands for
CXCR3 by determining their abilities to induce calcium flux, we
examined the ability of these CC and CXC chemokines to mobilize calcium
in our human CXCR3 transfectant pool. Untransfected 293EBNA cells do
not respond to any of chemokines tested in this experiment. Fig. 1
shows that both human IP-10 and MIG
induced a calcium flux in a dose-dependent manner through human CXCR3,
with significant flux detected as low as 100 pM for IP-10. Mouse 6Ckine
weakly induced a calcium flux detectable at 10 nM chemokine.
Recombinant human I-TAC, which has become available recently, was
confirmed to be a functional ligand (data not shown) as reported (11).
Unexpectedly, repeated experimentation has revealed that human 6Ckine
does not induce flux through human CXCR3 up to 100 nM. The same results
were observed when using human 6Ckine obtained from three commercial
suppliers. In addition, human 6Ckine from one major supplier was
confirmed to be authentic by N-terminal protein sequencing.
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Moreover, there are human chemokines for which there are no known mouse
homologues (e.g., IL-8, monocyte chemoattractant protein
(MCP)-2, and MCP-4); there are mouse chemokines for which there
are no known human homologues (e.g., MCP-5, C10, and MIP-1
). It is
possible that more functional homologues of these mouse and human
chemokines remain to be discovered. Nonetheless, we cannot assume that
the function of chemokines identified so far will cross species
barriers. The potential lack of correlation between some mouse and
human chemokines, and the first report here of apparently homologous
chemokines utilizing different receptors in mouse and humans, raises a
note of caution for predicting human biology from data obtained for
chemokines and their receptors in the mouse.
| Acknowledgments |
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| Footnotes |
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2 Abbreviations used in this paper: ELR, Glu-Leu-Arg; IP-10, IFN-
inducible protein 10; MIG, monokine induced by IFN-
; MIP3ß, macrophage inflammatory protein-3ß. ![]()
Received for publication November 10, 1998. Accepted for publication January 25, 1999.
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