Role of CXC Chemokine Receptor 3 Pathway in Renal Ischemic Injury
Paolo Fiorina*,
Mohammed Javeed Ansari*,
Mollie Jurewicz*,
Mark Barry*,
Vincent Ricchiuti,
Rex Neal Smith,
Susan Shea,
Terry K. Means,
Hugh Auchincloss, Jr.,
Andrew D. Luster,
Mohamed H. Sayegh* and
Reza Abdi*
* Transplantation Research Centre, Childrens Hospital and Brigham and Womens Hospital, and Endocrinology Core Lab, Brigham and Womens Hospital, Harvard Medical School, and Department of Pathology and Surgery, and Division of Rheumatology, Allergy and Immunology, Massachusetts General Hospital, Boston, Massachusetts
Address correspondence to: Dr. Reza Abdi, Transplantation Research Center, Childrens Hospital and Brigham and Womens Hospital, Harvard Medical School, 221 Longwood Avenue, Boston, MA 02115. Phone: 617-525-8003; Fax: 617-732-5254; E-mail: rabdi{at}rics.bwh.harvard.edu
Received for publication September 13, 2005.
Accepted for publication January 1, 2006.
Chemokines play a major role in the recruitment of leukocytesin inflammation and in the regulation of T helper 1 (Th1)/Th2immune responses. These mechanisms have been recognized to beimportant in the pathogenesis of renal ischemia-reperfusion(I/R) injury. The interaction of the CXC chemokine receptor3 (CXCR3) receptor with its ligands is a key pathogenic pathwayin promoting inflammation and in enhancing Th1 immune responses.After the induction of ischemia in the mouse model of renalischemia, an increase in intrarenal expression of CXCR3 andits ligands was observed. Compared with the wild-type (WT) mice,CXCR3-deficient mice (CXCR3/) had significantlylower serum creatinine levels, better survival rate, and significantlyless acute tubular necrosis and cellular infiltrates. In thekidney, intracellular staining of infiltrating cells that wererecovered from kidneys revealed a lower percentage of CD4+IFN-+cells in the CXCR3/ mice compared with the WTmice. Furthermore, adoptive transfer of WT CD3+ cells into CXCR3/mice before induction of I/R injury abrogated the protectionof CXCR3/ mice from I/R injury. It is concludedthat CXCR3 plays an important role in orchestrating the recruitmentof Th1 cells to the ischemic kidney and in mediating I/R injuryand therefore may serve as a novel target for the therapy ofI/R injury.
Ischemia-reperfusion (I/R) injury could lead to ischemic renalfailure, which is one of the most common forms of acute renalfailure of the native kidneys as well as of the renal allograft(15). Despite major advances in understanding the pathogenesisof I/R, no satisfactory therapy is available, and ischemic acuterenal failure remains a major cause of morbidity and mortality(6). I/R injury begins with tissue hypoperfusion/hypoxia andleads to depletion of cellular ATP and cytoskeletal damage (7,8).Restoration of blood flow is accompanied by reperfusion injury,which is characterized by production of a number of inflammatorymolecules such as cytokines, reactive oxygen species (ROS),activation of leukocyte and endothelial cells, and upregulationof adhesion molecules/chemokines. The interactions of activatedleukocytes with injured endothelial cells play a crucial rolein the pathogenesis of the disease (6,9,10). There is a growingbody of evidence indicating that ischemic renal failure is aninflammatory disease (6,11). Antineutrophil strategies, T celldepletion, and blockade of T cell CD28-B7 co-stimulation havebeen reported to be beneficial in protection against I/R injury(1215). Chemokines are 8- to 10-kd proteins that playa central role in inflammation. They regulate all of the stepsthat are necessary for the recruitment of leukocytes to thesites of inflammation, including leukocyte activation, adhesion,chemoattraction, and transmigration across the endothelial barrier(1618). Chemokines are also important regulators of Thelper 1 (Th1)/Th2 responses as Th1 chemokines selectively recruitTh1 cells to sites of inflammation (1923). A Th1 shifthas been shown to have a deleterious effect in the pathogenesisof I/R (24). The CXC chemokine receptor 3 (CXCR3) is expressedpredominantly on a majority of activated inflammatory Th1 cells.It binds three different ligands, CXCL9 (monokine induced byIFN- [MIG]), CXCL10 (IFN-induced protein-10 [IP-10]),and CXCL11 (IFN- inducible T cell chemoattractant [ITAC]) (16).A high expression of CXCR3 receptor and its ligands has beenreported in different models of inflammation, including rheumatoidarthritis, multiple sclerosis lesions, type 1 diabetes, andallograft rejection (2528). Anti-CXCR3 strategies toreduce inflammation have yielded promising results in thesedisease models (24,25,2933). The role of CXCR3 in thepathogenesis of I/R injury remains to be elucidated. Therefore,we tested the hypothesis that CXCR3 signaling plays a role inthe induction of inflammation through Th1 cell infiltration,mediating renal I/R injury.
Animals
CXCR3/ mice were generated in Craig Geraldslaboratory (30). C57BL/6 mice, purchased from Jackson Laboratory(Bar Harbor, ME), served as wild-type (WT) controls. All micewere weight (approximately 20 g) and sex matched in both groups.All procedures used in the animal experiments complied withthe standards set out in the Guidelines for the Care and Useof Laboratory Animals at Harvard University.
Uninephrectomized Renal I/R Injury Model
Mice were anesthetized by injection of 0.01 ml/g tribromoethanol,and a right flank incision was made. The right renal pediclewas divided between two ligatures, the right kidney was removed,and the wound was closed with staples. The mice were allowedto recover from anesthesia and surgery for 3 d. Then, the miceagain were anesthetized as above and placed on a heating padset to maintain the temperature of the mice at 37°C. A leftflank incision was made, the left renal pedicle was occludedwith a nontraumatic microvascular clamp, saline at 37°Cwas instilled in the intraperitoneal cavity, and the surgicalsite was covered with gauze soaked in warm saline. The micewere placed in a ventilated incubator set at 37°C. Fortyminutes after placement of the clamp, the organ was allowedto reperfuse by removal of the clamp, and the wound was closedwith staples. The animals then were allowed to recover fromanesthesia and surgery with free access to food and water. Adoptivetransfer experiments involved transfer of 20 million splenocytesfrom WT mice into CXCR3/ mice a day before inductionof I/R injury as described above. Sham operation was performedin a similar manner, except for clamping of the renal vessels.Renal tissues from mice were removed at 0, 6, 24, 48, and 72h after I/R for pathologic examination and for gene expression.Blood samples were taken from the retro-orbital vein at eachtime point to evaluate renal function by measurement of serumcreatinine levels by Modified Jaffé reaction using theCreatinine Reagent Kit (Pointe Scientific, Lincoln Park, MI).
Tissue Preparation
One third of the kidney was placed in OCT for immunohistology.One third was fixed in 10% buffered formalin followed by embeddingin paraffin and staining with hematoxylin and eosin as wellas periodic acid-Schiff reagent. The remaining third was snap-frozenfor real-time PCR. The histologic slides of renal tissue wereexamined and reported without knowledge of the experimentaldesign. The degree of interstitial infiltration was assessedby counting the number of labeled cells in 20 randomly selectedhigh-power fields (x400) of outer medulla. Tubular necrosiswas evaluated in a semiquantitative manner by determining thepercentage of tubules in the outer medulla in which epithelialnecrosis or necrotic debris was observed. A five-point scalewas used: 0, normal kidney; 0.5, <10%; 1, 10 to 25; 2, 25to 50%; 3, 50 to 75%; and 4, 75 to 100%.
RNA Extraction and Real-Time PCR
Total RNA was extracted from kidneys with Trizol reagent (LifeTechnologies, Gaithersburg, MD) according to the manufacturersprotocol. RNA was extracted to synthesize cDNA. Primers Expresssoftware was used to design the primers. The qPCR reaction consistedof 250 ng of cDNA, 10 µl of SYBR Green master mix (AppliedBiosystems, Foster City, CA), and 250 nmol of sense and antisenseprimer. The reaction conditions were as follows: 50°C for2 min, 95°C for 10 min, then 40 cycles of 95°C for 15s and 60°C for 1 min. Emitted fluorescence for each reactionwas measured during the annealing/extension phase. The calculatednumber of copies was divided by the number of copies of thehousekeeping gene glyceraldehyde-3-phosphate dehydrogenase.
Flow Cytometry and Intracellular Cytokine Staining
All mAb were purchased from BD Biosciences (San Jose, CA) oreBioscience (San Diego, CA). For intracellular cytokine staining,cells were washed in PBS that contained 2% FCS, fixed and permeabilizedwith Cytofix/Cytoperm solution (BD Biosciences) according tomanufacturers instructions, and incubated with PE-conjugatedIFN- or isotype control mAb for 30 min at 4°C. IFN- productionwas analyzed as percentage of cytokine positivity taking intoconsideration the negative staining defined by staining withisotype controls.
Adoptive Transfer
We adoptively transferred 2 x 107 WT CD3+ cells that were extractedfrom WT splenocytes with magnetic beads (Miltenyi Inc., Auburn,CA) into CXCR3/ mice immediately after clamping.We then evaluated creatinine levels and kidney histology at24 h.
Statistical Analyses
Data are expressed as mean ± SEM. A one-way ANOVA, followedby an unpaired t test, was performed to compare the differencesbetween the two groups. Kaplan-Meier analysis was used for survivalanalysis. Statistical significance was set at P < 0.05. Analysisof data was performed using an SPSS statistical package forWindows (SPSS Inc., Chicago, IL).
Temporal Expression of CXCR3 and Its Ligands
To examine the role of CXCR3 and its ligands in I/R injury,we first tested their expression in the kidney after ischemiaat 6, 24, and 72 h after reperfusion. The induction of IP-10/CXCL10and MIG/CXCL9 expression was seen as early as 6 h after clampingwith a steady increase over time (Figure 1A). ITAC expressionwas detected at very low levels (data not shown). The inductionof CXCR3 expression was also noted at 6 h after clamping; itis interesting that its expression diminished later on. CXCR3downregulation could be explained through two pathways of rapiddesensitization of CXCR3 or by internalization (Figure 1B) (32).To address whether uninephrectomy before clamping affects thecontralateral kidney and contributes to the differences thatwe observed, we examined the expression of CXCR3 and its ligandsin the contralateral kidney. No increase in the expression ofCXCR3 receptor or its ligands was noted in the contralateralkidney, and the histology was also normal, without any signsof tubular injury (data not shown).
Figure 1. CXC chemokine receptor 3 (CXCR3) ligands (A) and CXCR3 receptor gene expression (B) in the sham kidney and in wild-type (WT) kidney after ischemia-reperfusion (I/R; n = 4 mice per groups). WT mice show a dramatic elevation of serum creatinine at 24 h (five-fold over sham) and at 72 h (six-fold over sham) after reperfusion (C). In the CXCR3/ mice, the levels of serum creatinine at 24 and 72 h after reperfusion were significantly lower than those in the WT mice (P = 0.01; D).
Absence of CXCR3 Provides Protection against Renal I/R Injury
To test the functional relevance of CXCR3, we induced renalI/R injury in WT and CXCR3/ mice. WT mice showeda significant elevation of serum creatinine at 24 h (five-foldover sham) and at 72 h (six-fold over sham) after reperfusion(Figure 1C). The levels of serum creatinine for the sham andWT groups at 24 h after reperfusion was 0.58 ± 0.11 and3.33 ± 0.80 mg/dl, respectively (P = 0.01). In the CXCR3/mice, the levels of serum creatinine were significantly lowerthan those in the WT mice at 24 and 72 h after reperfusion (Figure 1C).Although these levels were higher than those of the shamgroup, the difference was not statistically significant (datanot shown). The survival rates of CXCR3/ and WTgroups were also compared by monitoring the viability of themice in each group. CXCR3 deficiency was associated with a muchbetter survival rate than those in the WT (at 10 d: WT 41.6versus CXCR3/ 78.9%; P = 0.01; Figure 1D). Wealso examined the expression of CXCR3 ligands in the CXCR3/mice after clamping. The expression of IP-10/CXCL10 increasesat 6 h after clamping in the kidney of CXCR3/mice (Figure 2A). No expression of ITAC was noted. Althoughexpression of MIG was detected at 6 h, its expression decreasedat 24 h (data not shown).
Figure 2. CXCL10/IFN-induced protein-10 (IP-10) expression is upregulated in the CXCR3/ mice after clamping (A). Kidney histology at 24 h after adoptive transfer in CXCR3/ mice showed infiltration comparable to WT mice (B). Higher expression of IL-4 (C) and IL-10 (D) is noted in CXCR3/, compared with WT kidney, after clamping.
Adoptive Transfer
To confirm further that CXCR3 deficiency on leukocytes was responsiblefor affording protection against renal I/R injury, we adoptivelytransferred CD3+ cells that were extracted from WT splenocytesinto CXCR3/ mice. Transferring splenocytes restoredI/R injury in CXCR3/ mice, as indicated by a significantrise in the serum creatinine level (3.1 ± 0.3 mg/dl atD1 and 2.6 ± 1.0 mg/dl at D3). Creatinine levels in theadoptively transferred mice approached creatinine levels ofWT mice. After adoptive transfer, CXCR3/ miceshowed histologic injury similar to that of regular WT miceafter clamping, with a large amount of inflammation and acutetubular necrosis (ATN) (Figure 2B). As far as mortality, CXCR3/mice that received adoptively transferred WT CD3+ cells showeda mortality of 50% up to 10 d, approaching that of WT mice.
Preserved Renal Histology in CXCR3/ Mice
We then examined the extent of ATN at different time pointsafter I/R. In WT mice, early stage of ATN was noted in outermedulla as early as 6 h. At 6 h, the semiquantitative scorefor tubular injury was 1.4 for the WT and 0.6 for the CXCR3/mice (P = 0.02). The average number of infiltrating CD3+ cellsper 20 high-powered fields was 12 for WT and five for the CXCR3/mice (P = 0.03).
The pathologic features of acute tubular necrosis worsened at24 h after I/R with massive amounts of hyaline and granularcasts (Figure 3A). In contrast, the degree of ATN in CXCR3/mice was markedly reduced as compared with that of WT mice at6 and 24 h after I/R (Figure 3B). No evidence of ATN was seenin the kidneys of sham-operated animals (data not shown). At6 h after reperfusion, immunohistology of the kidneys of WTgroup showed an increasing number of CD3+ and macrophages (datanot shown) over time and much less infiltration in CXCR3/mice (Figure 3, C and D, respectively).
Figure 3. Acute tubular injury (arrows) in WT (A) and CXCR3 KO (B) is identified as pink casts and absence of tubular epithelia. The injury is much worse in the WT group. Compared with the CXCR3/ mice, kidney immunohistochemistry of WT mice showed a significantly higher number of CD3+ infiltrating cells (C and D).
Preferential Recruitment of Th2 Cells in CXCR3/ Mice
Given the importance of Th1/Th2 cytokines in the pathogenesisof I/R injury and that CXCR3 is expressed primarily by Th1 cells,we assessed the status of Th1/Th2 immune responses by evaluatingintracellular cytokine staining of infiltrating cells that wereextracted from the kidneys after reperfusion. The percentageof IFN+CD4+ cells at 6 h was much higher in the WT (79.1%) thanthose in CXCR3/ (25.9%) mice (Figure 4, A andB). We also investigated the expression of Th2 cytokines, IL-4,and IL-10 between two groups. The IL-4 and IL-10 gene expressionwas higher in the CXCR3/ kidneys (Figure 2, Cand D).
Figure 4. Flow cytometry with intracellular staining showed a shift toward Th1 response in WT compared with CXCR3/ mice (A and B). Real-time PCR showed an increase in expression of proapoptotic gene caspase-3 (C) and downregulation of antioxidant genes (heme oxygenase [HO-1] and superoxide dismutase [SOD]), in WT mice compared with CXCR3/ (n = 4 mice per groups; D and E).
Lower Expression of Proapoptotic/Antioxidant Genes in CXCR3/ Mice
To explore protective mechanisms in CXCR3/ mice,we examined and compared the change in level of expression ofproapoptotic gene caspase-3 and of antioxidant genes superoxidedismutase (SOD) and heme oxygenase (HO-1) between the sham andischemic kidneys (at 24 h) in each group. Whereas the levelof caspase-3 expression was unchanged in the CXCR3/group, a significant increase was noted in the WT group; thiswas associated with marked increase in HO-1 gene expressionin the CXCR3/ group but not in the WT group (Figure 4,C through E). SOD expression was decreased in the WT groupcompared with no change in the CXCR3/ group. BothHO-1 and SOD have been shown to be important in decreasing theproduction of ROS and attenuating ischemia (8,33).
I/R injury is the most common cause of acute renal failure.With the increasing number of critically ill patients, I/R injuryremains one of the main reasons for patients death inintensive care units. In transplantation, I/R injury is theprimary cause of delayed graft function, which significantlycontributes to morbidity and mortality in organ transplantation.Other than supportive care, there is no satisfactory therapyfor this type of acute renal failure (6).
In this report, we have evaluated the role of CXCR3 receptorpathway in I/R kidney injury in mice to establish novel therapeuticstrategies for I/R injury. We have studied the expression ofCXCR3 and its ligands MIG/CXCL9 and IP-10/CXCL10 after inductionof ischemia. Lack of CXCR3 signaling offered protection againstI/R injury. Compared with the WT mice, CXCR3/mice had significantly lower serum creatinine levels, bettersurvival, and significantly less histologic evidence of acutetubular necrosis. Inflammation has increasingly been recognizedto contribute substantially to the pathogenesis of I/R injury.During the course of reperfusion, there is a cascade of inflammatoryresponses, consisting of recruitment of peripheral leukocytesand leukocyteendothelial cell interactions (34). In thisregard, Fairchild et al. (35) showed the importance of IL-8and macrophage inflammatory protein-2 chemokines in the recruitmentof neutrophils that mediate injury after ischemia. Recent studiesthat examined the role of T cells in the pathogenesis of I/Rsuggested a crucial role of T cells as the key mediators inI/R injury (14,36,37). In our study, at 6 h after reperfusion,we noted the accumulation of T cells and macrophages in theWT mice. Cellular infiltrates in the CXCR3/ micewere less than that in WT mice at 6 h. Restoration of renalinjury in CXCR3/ mice after adoptive transferof WT splenocytes into CXCR3/ mice highlightsthe primary role of CXCR3 signaling in recruiting T cells intokidneys shortly after the induction of ischemia and mediatingrenal injury. The recruitment of WT CD3+ cells to the kidneyin the CXCR3/ mice after adoptive transfer maybe mediated by the increase in IP-10/CXCL10 expression in thekidney. That blockade of co-stimulatory pathways was also associatedwith attenuation of I/R injury may suggest that T and dendriticcell interactions play an important role in I/R injury (13,38,39).The damaged tubular epithelial cells were shown to express MHCclass II antigens, which could be picked up and presented byrecruited dendritic cells to autoreactive CD4+ T cells, signifyingthe importance of autoreactive cellular immunity in I/R injury(40). The other aspect of our study is to examine the importanceof Th1/Th2 immune response in I/R injury. Current data suggestthat the Th1 immune response could be injurious, whereas theTh2 phenotype could be protective against I/R injury (26). Theproinflammatory cytokine IFN- (a Th1 cytokine) has been shownto generate a number of detrimental changes, including disruptionof cell-matrix adhesion, inducing cell shedding into the lumen,and upregulating adhesion molecules and selectins (14,41). CD4+T cells were reported to require IFN- to be able to generateinjury (42). Data from the studies that used STAT6- and STAT4-deficientmice were consistent with the protective effect of Th2 T cellphenotype (26). The significance of chemokines in I/R injurycould be highlighted by their importance in regulating the Th1/Th2immune responses. Th1 cells selectively undergo chemotaxis toIP-10/ CXCL10 and MIG/CXCL9, ligands for CXCR3 (43). The expressionof chemokine receptors depends on the state of activation ordifferentiation of a T cell. CXCR3 and CCR5 are expressed onactivated Th1 cells, whereas CCR3, CCR4, and CCR8 expressioncharacterizes Th2 cells. Within a few minutes after I/R, overexpressionof chemokines from ischemic tissue should recruit inflammatorycells to establish early injuries. Enhanced expression of theTh1 chemokine/receptors CXCR3 will be associated with increasingmonocyte/macrophage infiltrates and a Th1 response, aggravatinginitial injuries. Our data, consistent with previous studies,demonstrate a reduced recruitment of Th1 cells in the CXCR3/mice.
The release of ROS and consequent activation of apoptotic genessuch as caspase-3 that occur in the reperfusion phase of I/Rhave been shown to be the common downstream pathway that leadsto tissue injury (4446). Injury that is caused by oxidativestress occurs when the generation of ROS exceeds the capacityof the antioxidant defenses.
In such a situation, there may be indiscriminate damage to lipids,proteins, and DNA, leading to cell dysfunction and tissue damage(8,33,47,48). Such pattern is noted in the WT group reportedhere. It was shown recently that specific subsets of infiltratingcells could be beneficial by overproduction of HO-1 (2). Whetherthere is a direct correlation between the CXCR3 signaling andsuch pathways is an interesting concept that could be a subjectof future studies.
Despite the protection against I/R injuries in the CXCR3/group, we noted some mortality at early time courses after clamping,a rise in serum creatinine, and some degree of ATN in the CXCR3/kidneys. These highlight the probability that other chemokine/chemokinereceptor pairs play a compensatory role in promoting I/R injuries.Identifying candidate chemokine receptors that are overexpressedand demonstrating their functional importance in I/R injuriesare the subjects of our future studies.
Our data suggest that CXCR3-mediated recruitment of Th1 inflammatorycells could play an important role in renal injury that is inducedby I/R. Therefore, anti-CXCR3 strategies could yield promisingresults in preventing the renal I/R injury.
Acknowledgments
R.A. is a recipient of a Juvenile Diabetes Research FoundationCareer Development Award. M.J.A is supported by The AmericanSociety of Transplantation, Juvenile Diabetes Research Foundation(AST-JDRF) Joint Fellowship Grant.
Footnotes
Published online ahead of print. Publication date availableat www.jasn.org.
P.F. and M.J.A. contributed equally to this work.
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