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CUTTING EDGE |


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Department of Microbiology and Immunology, Walther Oncology Center, Indiana University School of Medicine, and Walther Cancer Institute, Indianapolis, IN 46208; and
Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109
| Abstract |
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, expression of these
chemokines is independent of Stat4. We further show that supernatants
from activated Th2 cells preferentially induce the chemotaxis of Th2
over Th1 cells, corresponding with Stat6-dependent expression of CCR4
and CCR8 in Th2 cells. These data provide the basis for restricted and
direct T cell-mediated cellular recruitment to sites of
inflammation. | Introduction |
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and mediate delayed-type
hypersensitivity and protection against intracellular pathogens. The
Th2 subset produces IL-4, IL-5, IL-10, and IL-13 and is implicated in
humoral and allergic responses. The differentiation of these Th subsets
is dependent on cytokine-stimulated genetic programs. IL-12-activated
Stat4 is required for the development of fully functional Th1 cells
(3, 4, 5). Similarly, IL-4-activated Stat6 is essential for
the differentiation of Th2 cells (6, 7, 8).
Although the exact nature of the STAT protein activated genetic program
is unknown, it has been demonstrated that genes other than cytokines
are differentially expressed between Th1 and Th2 cells. Several of
these are chemokine receptors including CXCR3, CCR5, and CCR7,
preferentially expressed in Th1 cells (9, 10, 11), and CCR3,
CCR4, and CCR8, which are preferentially expressed in Th2 cells
(9, 10, 12, 13). This provides a mechanism by which Th
subsets can be selectively recruited to sites of inflammation. Indeed,
Th1 cells selectively undergo chemotaxis to IFN-
-inducible protein
(IP-10), a ligand for CXCR3, and RANTES, macrophage inflammatory
protein 1
(MIP-1
)3 and
MIP-1ß, ligands for CCR5 (9, 14). Similarly, Th2 cells
selectively undergo chemotaxis to macrophage-derived chemokine (MDC), T
cell activation gene 3 (TCA3), and thymus- and activation-regulated
chemokine (TARC), chemokines that are ligands for CCR4 and CCR8
(9, 13, 15, 16, 17).
Because Th subsets are important in regulating inflammatory processes, it seemed likely that they would also secrete discrete patterns of chemokines to recruit restricted types of cells to sites of inflammation. Although chemokine receptor expression in Th subsets has been extensively described, restricted expression of chemokines between Th subsets has not been carefully examined. We have determined the expression patterns of 18 chemokines and shown that there is restricted expression of chemokines between Th1 and Th2 cells that is dependent on the function of Stat6 but not Stat4. We further demonstrate that Th2 supernatants preferentially recruit Th2 rather than Th1 cells.
| Materials and Methods |
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The generation of Stat4- and Stat6-deficient mice has been previously described (3, 6). Both strains have been backcrossed 10 generations to the BALB/c genetic background and were bred as homozygotes in the Indiana University Laboratory Animal Resource Center. Wild-type BALB/c mice were purchased from Harlan Bioproducts (Indianapolis, IN).
T cell differentiation
Total spleen cells were depleted of CD8+,
B220+, and FcR+ cells.
CD4+ cells were positively selected from the
resulting populations using magnetic beads from Miltenyi Biotec
(Auburn, CA) according to the manufacturers instructions. Final
CD4+ populations were >97%
CD4+ as determined by FACS analysis.
CD4+ T cells cultured at
106 cells/ml were then differentiated with 2
µg/ml plate-bound anti-CD3 (145-2C11) plus 1 µg/ml
anti-CD28 (PharMingen, San Diego CA) to Th1 (1 ng/ml IL-12
(Peprotech, Rocky Hill, NJ) and 10 µg/ml anti-IL-4 (11B11)) or
Th2 (10 ng/ml IL-4 (Peprotech) plus 10 µg/ml anti-IFN-
(R4/6A2)) populations. After 6 days, cells were restimulated with 2
µg/ml plate-bound anti-CD3 for the indicated times for RNA
analysis or for 24 h to recover supernatants.
Chemokine mRNA analysis
Total RNA samples were isolated from cell populations indicated
using Trizol (Life Technologies/BRL, Bethesda, MD). RNase protection
assays (RPA) were done according to the manufacturers instructions
(PharMingen). cDNA probes for monokine induced by IFN-
(MIG), TARC,
and CCR8 were generated by PCR, subcloned, and sequenced to confirm the
identity of the probes. The cDNA probes for MDC (a gift of Dr. Uli
Schindler, Tularik, South San Francisco, CA), Breast And Kidney,
Exodus-1, -2 and -3 (gifts of Dr. Rob Hromas, Indiana University,
Indianapolis, IN), and CCR4 (a gift of Dr. Byung Youn, Indiana
University, Indianapolis, IN), and PCR probes were labeled using random
decamers (Ambion, Austin, TX) and hybridized overnight in a formamide
hybridization buffer.
ELISAs
ELISAs for IL-4 and IFN-
were performed as described
previously (5, 6). Rabbit anti-murine MDC Abs were
prepared by multiple-site immunization of New Zealand White rabbits
with recombinant murine MDC (R&D Systems, Rochester, MN) in CFA.
Polyclonal Abs were titered by direct ELISA and specifically verified
by the failure to cross-react to other chemokines. The IgG portion of
the serum was purified over a protein A column and used in a sandwich
ELISA. Goat anti-murine RANTES was made as previously described
(18). The levels of chemokines in cell-free supernatants
were measured by specific ELISA using a modification of a double-ligand
method as previously described (19).
Chemotaxis assay
Chemotaxis assays were performed in a Costar (Cambridge, MA) Transwell with a 3-µm pore filter. Assays were performed in chemotaxis buffer (RPMI 1640, 1% BSA, and 20 mM HEPES). Supernatants from the indicated Th population were diluted 1:2 with chemotaxis buffer in the lower chamber and 5 x 105 Th2 cells in the upper chamber. After 4 h, cells in the lower chamber were counted using trypan blue exclusion. Rabbit anti-MDC serum was purified using protein G and used in the assay at 10 µg/ml. Anti-TCA3 was purchased from PharMingen. Control Ig was purified by protein G from normal rabbit serum. Supernatants were incubated with anti-MDC for 1 h on ice before adding to Transwell culture.
| Results and Discussion |
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Because chemokines are known to recruit cells to sites of
inflammation, and because Th subsets mediate distinct types of
inflammation, we examined whether Th1 and Th2 cells secreted distinct
sets of chemokines. CD4+ T cells (>97% pure),
purified from wild-type spleen cells, were differentiated to Th1 or Th2
phenotypes. After 1 wk in culture, cells were restimulated with
anti-CD3. Restimulation of Th1 and Th2 cultures resulted in
secretion of IFN-
and IL-4, respectively (Fig. 1
A). RPA were used to assess
the expression of a panel of chemokines in cultures that were
unstimulated or activated for the time periods indicated with
anti-CD3. Expression of RANTES and lymphotactin was induced by
anti-CD3 specifically in Th1 populations (Fig. 1
B). By
contrast, Th2 cells selectively expressed TCA3 following stimulation
with anti-CD3. To determine whether expression of these chemokines
in Th subsets was dependent on the genetic programs activated by Stat4
and Stat6, we performed the differentiation described above with
CD4+ T cells from mice deficient in either Stat4
or Stat6. These cultures secreted cytokines as predicted from previous
results (Fig. 1
A). TCA3 expression was dependent on Stat6,
as Stat6-deficient CD4+ Th2 cultures did not
express TCA3 (Fig. 1
B). Surprisingly, and in contrast to
IFN-
, RANTES and lymphotactin were expressed in Stat4-deficient Th1
cultures (Fig. 1
B). This suggests that Stat4 is not required
for RANTES and lymphotactin expression in Th1 populations and also
correlates with the ability of Stat4-deficient lymphocytes to mediate
reduced but significant tissue inflammation (5).
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represses, MDC expression from
macrophages, dendritic cells and B cells (16, 20, 21) we
tested whether anti-CD3 induced cytokines were responsible for
Th2-restricted MDC expression. Wild-type Th2 cells restimulated with
anti-CD3 in the presence of anti-IL-4 showed that the absence
of IL-4 reduced but did not abrogate MDC expression (Fig. 2
were not inducible by
IL-4 (Fig. 2
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MIP-1
and MIP-1ß are often associated with Th1-mediated
inflammatory lesions (22, 23, 24). However, our RPA analysis
demonstrated that Th1 cells express only about 2-fold more RNA for
these chemokines than Th2 cells. Importantly, expression of both
MIP-1
and MIP-1ß was readily detectable in Th2 cells (Fig. 1
B). This difference was also reflected in ELISAs where
MIP-1
was readily detectable in supernatants of Th2 cells, but
accumulated in Th1 supernatants at 2- to 5-fold higher levels than in
Th2 supernatants (data not shown). Furthermore, the absence of either
Stat4 or Stat6 had only minor affects on the expression of MIP-1
and
MIP-1ß (Fig. 1
B) or the secretion of MIP-1
(data not
shown).
Other chemokines had undetectable expression in either Th1 or Th2
cells. These included chemokines that were analyzed by RPA in Fig. 1
B (eotaxin, monocyte chemoattractant protein-1 (MCP-1),
MIP-2, and IFN-
-inducible protein (IP-10)), Northern blot analysis
(MIG, TARC, Exodus-1 (LARC/MIP-3
), Exodus-2 (TCA4/SLC/6Ckine),
Exodus-3 (ELC/MIP-3ß/CKß11) and BRAK; data not shown), and ELISA
(C10 and MCP-3; data not shown).
Th2 supernatants preferentially recruit Th2 cells
The chemokines that are preferentially expressed in Th2 cells are
also ligands for receptors that are differentially expressed between Th
subsets. The Th2 chemokines MDC and TCA3 signal through CCR4 and CCR8,
respectively, which are also expressed at greater levels in Th2 cells
than in Th1 cells and are expressed in a Stat6-dependent manner (Fig. 4
A). This led us to the
prediction that Th2-generated chemokines would be more effective at
stimulating the chemotaxis of Th2 cells. To test this, we used Th2
supernatants generated as above, in a standard, two-chamber migration
assay. As shown in Fig. 4
B, Th2 supernatants were
significantly more effective in stimulating chemotaxis in Th2 cells
than were Th1 supernatants or media alone (p <
0.01). Th2-induced chemotaxis could be inhibited by coincubation of the
supernatant with anti-MDC, demonstrating that Th2-derived MDC is an
important mediator of Th2 chemoattraction. Incubation with
anti-TCA3 did not significantly affect Th2 migration in response to
Th2 supernatants. Thus, Th2-derived chemokines can differentially
recruit Th subsets.
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,
MIP-1ß, and RANTES have also been shown to be both differentially and
similarly expressed in Th1 and Th2 populations (25, 28).
Some of these discrepancies may be simply explained by the use of
methods that were not quantitative enough to distinguish preferential
expression in Th subsets or by differences in cultured primary T cells
vs long-term T cell clones. Our report describes the systematic and
quantitative examination of the expression of 18 chemokines in primary,
polyclonally activated, and purified CD4+ cells
that have been polarized to the Th1 or Th2 phenotype.
The differential dependence on STAT proteins for the acquisition of
chemokine secreting phenotypes is distinct from that required for
cytokines. Although Stat6 appears to be necessary for the development
of Th2 cells and secretion of IL-4, MDC, and TCA3, there is not the
same requirement for Stat4. In the absence of Stat4, Th1 cells can
still acquire a chemokine-secreting phenotype that includes RANTES and
lymphotactin. We have previously suggested that Th1-like populations
can be generated in the absence of Stat4 (5). However,
this observation was complicated by the direct effects of Stat4 on
IFN-
expression, which served as the sole marker for Th1 cells
(3, 5). Using RANTES and lymphotactin as representative
chemokines of Th1 and not Th2 cells, we provide further evidence here
that cells with some characteristics of Th1 cells can develop in the
absence of Stat4. Thus, the differential expression of chemokines in
Th1 and Th2 cells offers additional markers for analysis of Th subsets
that may be important for tracking and detecting Th cells in vivo and
in vitro.
Our data also provide a novel view of the biology of Th1 and Th2 cells.
In many instances Th cells have been characterized as recruits rather
than recruiters to sites of inflammation. This study suggests that Th
cells can contribute to inflammation not simply by secretion of
cytokines such as IFN-
and IL-4, which regulate inflammatory
processes, but also by secreting specific subsets of chemokines to
recruit additional cells to an inflamed site. For example, both MDC and
Th2 cells are required for allergic airway hypersensitivity (17, 26, 29, 30), raising the possibility that Th2 cells may be a
relevant source of this chemokine during allergic inflammation.
Similarly, anti-RANTES decreases migration into sites of
Th1-mediated inflammation (31, 32, 33). Although lymphotactin
has reproducibly been identified in Th1 cells (Refs. 28
and 34 , and this report), the lymphotactin receptor, XCR1,
is expressed on CD8+ cells and equally on Th1 and
Th2 cells (Ref. 35 , and our unpublished results). Thus, in
Th1-regulated inflammation, lymphotactin may act primarily to recruit
CD8+ cytotoxic cells to inflamed sites. These
observations provide the basis for understanding specific T
cell-mediated recruitment of leukocytes to sites of inflammation. They
also suggest additional targets for modulating chemokine-mediated
inflammation in vivo.
| Acknowledgments |
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| Footnotes |
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2 Address correspondence and reprint requests to Dr. Mark H. Kaplan, Department of Microbiology and Immunology, Walther Oncology Center, Indiana University School of Medicine, 1044 West Walnut Street, Room 302, Indianapolis, IN 46202. ![]()
3 Abbreviations used in this paper: MIP, macrophage inflammatory protein; MDC, macrophage-derived chemokine; TARC, thymus- and activation-regulated chemokine; MIG, monokine induced by IFN-
; RPA, RNase protection assay. ![]()
Received for publication March 1, 2000. Accepted for publication May 1, 2000.
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M. J. Scott, C. J. Godshall, and W. G. Cheadle Jaks, STATs, Cytokines, and Sepsis Clin. Vaccine Immunol., November 1, 2002; 9(6): 1153 - 1159. [Full Text] [PDF] |
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K. Blease, J. M. Schuh, C. Jakubzick, N. W. Lukacs, S. L. Kunkel, B. H. Joshi, R. K. Puri, M. H. Kaplan, and C. M. Hogaboam Stat6-Deficient Mice Develop Airway Hyperresponsiveness and Peribronchial Fibrosis during Chronic Fungal Asthma Am. J. Pathol., February 1, 2002; 160(2): 481 - 490. [Abstract] [Full Text] [PDF] |
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B. F. Skinnider, A. J. Elia, R. D. Gascoyne, B. Patterson, L. Trumper, U. Kapp, and T. W. Mak Signal transducer and activator of transcription 6 is frequently activated in Hodgkin and Reed-Sternberg cells of Hodgkin lymphoma Blood, January 15, 2002; 99(2): 618 - 626. [Abstract] [Full Text] [PDF] |
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