Division of Nephrology, New York University School of Medicine, New York, New York
Correspondence: Dr. Peter J. Nelson, Division of Nephrology, New York University School of Medicine, Smilow Research Center, 522 First Avenue, New York, NY 10016. Phone: 212-263-7681; Fax: 212-263-7683; E-mail: nelsop02{at}popmail.med.nyu.edu
Dendritic cells (DC) in nonlymphoid organs function at the crossroadsof innate and adaptive immunity, self-tolerance, and tissuehomeostasis. This review provides an overview of the study ofDC in the kidney, tracing its history leading to the currentknowledge of the origins, migration, and function of renal DC.Together, these studies suggest that renal DC play a criticalrole in the health and disease of the kidney, opening the wayto direct targeting of renal DC for therapeutic benefit.
Dendritic cells (DC) have been extensively studied in lymphoidand many nonlymphoid organs in the past three decades but havereceived comparatively little attention in the kidney. One reasonfor this disparity has been an apparent difficulty in identifying,isolating, and manipulating renal DC (rDC) in vitro and in vivoto gain a better understanding of their function in the kidney.These barriers to the study of rDC have fallen in recent years,and it is now clear that rDC exist in intimate communicationwith the entire renal parenchyma, constantly surveying for andresponding to local environmental cues. Here, we review thehistory of the identification of the rDC network; the originsand migration of rDC at steady state; and the function of rDCin innate and adaptive immunity, self-tolerance, and homeostasisof the renal parenchyma.
Ground-breaking studies in the 1970s by Steinman and colleagues1,2identified and functionally segregated "dendritic cells" fromother immunocytes in lymphoid organs. This led to the discoverythat splenic DC potently stimulated the proliferation of T lymphocytesin mixed leukocyte reactions and expressed surface Ia antigens,3identifying DC as MHC class II+. rDC in rat kidney were subsequentlyrecognized in 1981 by the existence of resident MHC class II+cells with stellate and "mononuclear phagocyte" morphology inthe renal interstitium4,5 and mesangium.6 These anatomic locationswere subsequently confirmed by electron microscopy7,8; however,proof that rDC alloactivate T lymphocytes, similar to DC isolatedfrom lymphoid tissues, was not reported until 19949 or substantiateduntil more recently,10–12 after the ability to isolaterDC via CD11c (the integrin x chain) expressed by differentiatedmouse DC.13 Similar to other DC, differentiated rDC were alsocharacterized as "immature" versus "mature" on the basis oftheir low versus high expression of co-stimulatory molecules,respectively.
Several functional subsets of DC have now been phenotyped,13–18and some of these subsets have been identified in the kidneyusing defined markers (Table 1). Within normal mouse kidneys,>90 to 95% of CD11c+ rDC are negative for CD8 and CD45RA(B220),10,12,19 indicating that the majority of mouse rDC areof the myeloid lineage and major constituents of the mononuclearphagocyte system within the kidney.19,20 Small numbers of lymphoid(CD11c+CD8+B220–; this subset has been identified in micebut not in humans13) and preplasmacytoid (CD11c+CD8–B220+)rDC have also been detected within mouse kidneys.10,19 Withinnormal human kidneys, myeloid (BDCA-1+DC-SIGN+ and BDCA-1+DC-SIGN–)and preplasmacytoid (BDCA-2+DC-SIGN–) rDC were recentlyidentified, and on the basis of the quantitative area of positivestaining for BDCA-1 versus BDCA-2 in thin sections, preplasmacytoidrDC represent a greater fraction of total rDC in normal humankidneys as compared with normal mouse kidneys (up to 20% versus<10%, respectively).10,19,21 Whether mouse or human kidneysharbor or recruit any of the most recently defined functionalDC, such as IFN-producing killer DC,22,23 inflammatory TNF-/induciblenitric oxide synthase–producing DC,24,25 and tolerogenicIDO-expressing DC,26–31 is unclear.
Table 1. Representative markers of rDC subsets at steady state10–12,19,21
Unequivocal evidence that rDC form a true anatomic surveillancenetwork within the renal parenchyma, rather than a random dispersionat steady state, was determined by examination of rDC in situin the kidneys of CX3CR1GFP/+ mice (Figure 1).19 Under intravitaland confocal microscopy from the capsule to the papilla of kidneysin CX3CR1GFP/+ mice, stellate-shaped myeloid rDC form a contiguousnetwork throughout the entire interstitium, encasing all nephrons.19Confirming previous studies,6,7 myeloid rDC that resemble pre-DC(analogous to the globular shape of resident preplasmacytoidDC15) are also present at low density within the mesangium ofCX3CR1GFP/+ mice.19 Importantly, recent studies indicated thata similar anatomic surveillance network of rDC exists throughoutthe interstitium and mesangium of normal human kidneys.21 Therefore,at steady state, rDC are positioned to respond immediately to"danger" or "tolerogenic" signals32 anywhere within the renalparenchyma, whether derived from self or nonself sources.
Figure 1. Surveillance of the renal parenchyma by the rDC network. The three panels shown are high-power views of the same location in the outer medulla of a normal kidney from a CX3CR1GFP/+ mouse captured by confocal microscopy. The resident rDC network (A) is an anatomically separate cellular compartment from the renal parenchyma that it surveys (B). This affords rDC the ability to respond rapidly to local environmental cues, to migrate apart from nephrons, and to communicate with other components of the immune system both within and outside the kidney. (C) Merge of A and B demonstrates the intimate relationship that exists between rDC and the renal parenchyma.
Similar to DC in other nonlymphoid organs,33–35 rDC constitutea heterogeneous population of bone marrow–derived hematopoieticcells that, unlike DC that function solely within lymphoid tissues(most of the DC in the thymus and spleen and approximately halfof the DC in lymph nodes), serve as sentinels within the kidneybefore trafficking to lymphoid organs.13–18 Because ofthe plasticity of FLT3+ common myeloid and common lymphoid DCprecursors to generate all DC subsets,16 local trophic cuesrather than the availability of DC precursors probably determinethe constituency of rDC at steady state. Notably, although administrationof the ligand for FLT3 to mice can mobilize rDC precursors andtransiently increase the total number of rDC, as it does forDC in other tissues,36 the proportion of each rDC subset isnot significantly altered when compared with the normal steadystate.10
Recent studies of myeloid rDC suggest a probable role of therenal microenvironment in stipulating the heterogeneity of rDC.Deriving from a shared clonogenic progenitor of the mononuclearphagocyte system37 along the long-lived "noninflammatory" CX3CR1highCCR2–monocyte lineage (also Ly6C–GR1– in mice; CD14lowCD16+in humans),19,38–41 myeloid rDC can express markers conventionallyassigned to macrophages (F4/80, CD68).10–12,19,42 Thisphenotypic overlap between myeloid rDC and macrophages20 isdifferential within normal kidneys; stellate-shaped CD11c+F4/80+rDC, for example, predominate in the medulla, whereas globular-shapedMHC class II+ pre-rDC reside in the mesangium.6,7,19,43 Thisfinding suggests that regional inductive factors shape the repertoireof rDC. It is interesting that engagement of the CSF-1 receptoris required for the differentiation and survival of myeloidDC,44 and constitutive expression of CSF-1 (i.e., M-CSF, a majorchemoattractant and growth factor for mononuclear phagocytes45)by renal epithelial cells seems to be more prominent in themedulla than in the cortex at steady state.46,47 Whether thisalone explains the heterogeneity of rDC is unclear. More likely,other differentially expressed trophic ligands (thymic stromallymphopoietin-like factors that may be elaborated by renal epithelialcells or interstitial stromal cell populations48,49) and extracellularmatrices within the kidney also contribute to the specificationof rDC.
Trafficking rDC precursors express several chemokine receptors(CCR)50–53 that are also involved in establishing andmaintaining the rDC network. Circulating immature mouse DC mobilizedby FLT3 ligand migrate in vitro to CCR ligands expressed atbasal levels within normal kidneys and, after adoptive transfer,traffic into the renal interstitium and mesangium in vivo.53In contrast, isolated immature mouse rDC fail to demonstratesimilar migration behavior despite expression of the same CCR.53This suggests that renal-derived chemokines recruit traffickingrDC precursors at steady state, but once in residence, differentiatingrDC precursors undergo CCR desensitization, possibly by moleculesother than chemokines.50,53–55 In addition, the lack ofredundant cellularity within the contiguous rDC network19 suggestsexquisite, reciprocal downregulation or sequestration of chemoattractantsdirectly at sites of occupancy by individual rDC.50
It is intriguing that self-renewal of rDC within the kidneymay also occur (analogous to DC in the skin56 and ovaries57),a possibility hinted at by the small population (<3%) ofresident CX3CR1highGR1– leukocytes in normal mouse kidneysthat lack phenotypic markers of differentiated DC.19 Becausepreliminary bromodeoxyuridine-labeling experiments in normalmice58 suggest an average half-life across all rDC subsets ofapproximately 35 d12 (Matthew Griffin, personal communication;Matthew Griffin, MD Associate Professor Mayo Clinic, Rochester,Minnesota, USA, Date of communication: 2/22/07), this latterpossibility, if true, will require innovative long-term studiesto capture. Approaches such as total body irradiation, longknown to be insufficient at fully ablating rDC,59,60 followedby bone marrow transplantation to reform the rDC network doesnot recapitulate normal rDC homeostasis and can lead to chimerismbetween donor and recipient rDC56
Innate Immunity
As sentinels of the immune system, rDC are positioned to integrateenvironmental cues and influence innate immune responses anywherewithin the kidney.19 This functional plasticity rests in theintrinsic ability of tissue-resident, surveying DC such as immaturerDC to sense and sample continually their immediate environment.This surveillance by rDC occurs by multiple mechanisms and includesthe following: Engagement of a broad repertoire of surface receptorssuch as Toll-like receptors,61,62 receptors for alarmins,63Fc receptors,64,65 complement receptors,65–67 C-type lectinreceptors,68–71 scavenger receptors,72,73 and cytokineand CCR; contact or paracrine-mediated signals from traffickinginnate immune cells such as neutrophils,74 natural killer cells,75,76natural killer T lymphocytes,75,77 and T lymphocytes75,78;contact or paracrine-mediated signals from trafficking adaptiveimmune cells79; and contact (e.g., via tunneling nanotubes19,80)or paracrine-mediated signals from adjacent resident rDC.81
In turn, the rapid integration of these external stimuli byrDC and their subsequent proinflammatory activation (if thestimuli are not tolerogenic) can prime and amplify innate immuneresponses. This occurs mainly through the secretion of cytokines(e.g., TNF-, type I IFN, IL-1, IL-2, IL-6, IL-12, IL-15) andchemokines by rDC that act on adjacent renal parenchymal cellsand innate immune cells,50,75,82 which includes resident preplasmacytoidDC as "professional type I IFN–producing" leukocytes.15For example, resident myeloid rDC were recently identified asthe predominant source of intrarenal TNF- produced during theearly "sterile" innate immune response to renal ischemia-reperfusioninjury,42 an insult that also induces the maturation and migrationof these resident myeloid rDC to lymphoid tissues.12 This initialcytokine response by resident rDC is separate from the cytokinessubsequently released by recruited "inflammatory" CX3CR1lowCCR2+rDC precursors (also Ly6C+GR1+ in mice; CD14hiCD16– inhumans).19,38–41 These latter cytokines contribute tosequelae of renal ischemia-reperfusion injury such as interstitialfibrosis,83 analogous to the cytokine response and egress versusinflux of rDC12,53,84versus rDC precursors,85 respectively,in response to LPS.
Adaptive Immunity
Not unexpected, rDC exhibit the hallmarks of well-equipped antigen-presentingcells of the adaptive immune system. Resident rDC at steadystate express MHC class I and class II molecules but bear lowlevels of co-stimulatory molecules (e.g., CD80, CD86, CD40).9–12,19Resident rDC probe their immediate environment (which may includethe lumen of the nephron)19 and capture self and nonself molecules,whether derived from within or outside the kidney, via phagocytosis,pinocytosis, and receptor-mediated endocytosis.12,19 In responseto the same "danger" signals that invoke innate immune responses,rDC also upregulate the expression of co-stimulatory moleculesand CCR7 (the CCR for ligands, CCL19, and CCL21, expressed bystromal cells in T lymphocyte–rich areas of lymph nodes86,87)and migrate to secondary lymphoid tissues bearing any moleculescaptured within the kidney (or generated within rDC) for processingand presentation to adaptive immune cells.9,10,12,53
These mature rDC potently stimulate T lymphocyte proliferation9–12and, depending on the nature of maturing stimuli,61,62,88 presumablysecrete cytokines that promote the differentiation of naiveT lymphocytes toward specific T helper (Th) effectors such asTh1, Th2, or Th17 lymphocytes89 (this has yet to be formallyreported). It is unclear, however, the degree to which environmentalcues that are unique to the kidney (e.g., Toll-like receptorrecognition of the kidney-restricted protein, Tamm-Horsfallglycoprotein90) "imprint" rDC to polarize preferentially naiveT lymphocytes and generate kidney-tropic Th effectors.91 Moreover,little is known regarding environmental cues that may retardthe egress of mature, antigen-presenting rDC out of the kidney(as recently shown in the bowel92), a recipe for inducing adaptiveimmune responses within the kidney itself and subsequently organizingpathogenic "nephron-associated lymphoid tissue."
Self-Tolerance
DC in peripheral tissues contribute to self-tolerance by supplementingcentral tolerance.93–96 Preliminary studies indicate thatrDC also play an important role in maintaining self-tolerancewithin the kidney. Immature rDC induce the expansion of T regulatorylymphocytes (Treg) in mixed leukocyte reactions and suppressallorecognition in vivo.10 These findings suggest that rDC maybe tolerogenic if engaged by T lymphocytes that have escapedthymic selection and are reactive to self-antigens within thekidney. Moreover, cross-presentation of self-antigens derivedwithin the kidney by rDC deletes autoreactive T lymphocytesin vivo by a Fas-mediated mechanism.97–99 These observationsare intriguing because several tissue-specific self-antigensdemonstrate low or no expression in the thymus and, thus, relyon peripheral mechanisms to help maintain tolerance.100 Thisis a potential confounder of many experimental kidney-restrictedpromoter systems that is often ignored. For example, failureto regulate or delete autoreactive T lymphocytes generated duringaccelerated apoptosis of renal parenchyma, an instigator ofautoimmunity,101,102 may explain why CD8+ T lymphocytes directedagainst kidney antigens, presumably presented by rDC, can developin kd/kd mice.103,104
The ability of DC to process and present antigen can also besuppressed after contact with Treg,105,106 raising the possibilitythat resident rDC themselves are targets for trafficking Treg.Notably, Treg ameliorate both the acute and chronic phases ofrenal disease in disparate models of immune-mediated renal injury,107–109although rDC–Treg interactions have not been studied inthese experiments. This possible interaction is an excitingarea of future inquiry, as is the potential to manipulate thereciprocal relationship between rDC and Treg to suppress immuneresponses that may be coordinated by rDC.110
Immunologic Homeostasis of the Renal Parenchyma
Surveillance by DC resident in tissues may mediate self-toleranceto and regeneration of dying parenchymal cells.102,111,112 Thereis mounting evidence that the rDC network may fulfill this crucialrole within the kidney. In mice, "alternatively" activated mononuclearphagocytes (i.e., an anti-inflammatory tolerogenic state incontrast to the "classically" activated proinflammatory state113)clear apoptotic cells within the developing kidney as earlyas embryonic day 12, and challenge of embryonic kidney explantswith M-CSF rapidly accelerates ureteric branching and nephroninduction114 (David Hume, personal communication; David Hume,PhD Professor University of Queensland, Brisbane, Australia,Date of communication: 2/20/07). This suggests the establishmentof mechanisms of apoptotic clearance during nephrogenesis thatare coupled to paracrine growth loops115,116 between rDC andthe renal parenchyma that persist in the mature kidney. It isinteresting that hepatocyte growth factor, an important growthfactor for renal epithelial cells,117 also alternatively activatesDC,118 and DC that are matured in the presence of anti-inflammatoryfactors selectively express angiogenic isoforms of vascularendothelial growth factor.119 Although preliminary, these studiescollectively suggest that rDC may participate in a coordinatedprogram to control growth and maintain the homeostatic functionof the renal parenchyma.
In this brief review, we have discussed the current knowledgesurrounding rDC. rDC function in the fundamental immunologicparadigm of continual surveillance. This is evidenced by theanatomic availability and intrinsic ability of rDC to respondrapidly to environmental cues anywhere within the kidney. rDCmigrate and communicate these cues to both arms of the immunesystem and to the renal parenchyma and renew to maintain a contiguousnetwork. In many respects, our understanding of rDC in the healthand disease of the kidney is very rudimentary, spawned in partby the considerable lag in research on rDC compared with DCin other organs and tissues. Fortuitously, much is now knownabout the biology of DC in general. Application of this knowledgeshould yield rapid and important advances in deciphering thecontribution of rDC to the pathogenesis, such as their rolein HIV infection in the kidney,120,121 and treatment, such astheir targeting by CDK/GSK-3 inhibitors,122,123 of many renaldiseases. This inquiry promises to be revealing in the yearsimmediately ahead.
P.J.N. is supported by National Institutes of Health grantsDK065498 and DK079498.
We thank Matthew Griffin for critical reading of the manuscriptand David Hume for helpful discussions on the role of mononuclearphagocytes in nephrogenesis. Rohan John was a visiting fellowat the NYU School of Medicine.
Footnotes
Published online ahead of print. Publication date availableat www.jasn.org.
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