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    doi:10.1152/advan.00063.201338:20-24, 2014.Advan in Physiol EduDaniel W. Trott and David G. HarrisonThe immune system in hypertension

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    Refresher Course

    The immune system in hypertension

    Daniel W. Trott and David G. Harrison

    Division of Clinical Pharmacology, Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee

    Submitted 13 June 2013; accepted in final form 20 December 2013

    Trott DW, Harrison DG. The immune system in hypertension. AdvPhysiol Educ 38: 20 24, 2014; doi:10.1152/advan.00063.2013.Whilehypertension has predominantly been attributed to perturbations of thevasculature, kidney, and central nervous system, research for almost50 yr has shown that the immune system also contributes to thisdisease. Inflammatory cells accumulate in the kidneys and vasculatureof humans and experimental animals with hypertension and likelycontribute to end-organ damage. We and others have shown that micelacking adaptive immune cells, including recombinase-activatinggene-deficient mice and rats and mice with severe combined immu-nodeficiency have blunted hypertension to stimuli such as ANG II,high salt, and norepinephrine. Adoptive transfer of T cells restores theblood pressure response to these stimuli. Agonistic antibodies to theANG II receptor, produced by B cells, contribute to hypertension in

    experimental models of preeclampsia. The central nervous systemseems important in immune cell activation, because lesions in theanteroventral third ventricle block hypertension and T cell activationin response to ANG II. Likewise, genetic manipulation of reactiveoxygen species in the subfornical organ modulates both hypertensionand immune cell activation. Current evidence indicates that theproduction of cytokines, including tumor necrosis factor-, interleu-kin-17, and interleukin-6, contribute to hypertension, likely via effectson both the kidney and vasculature. In addition, the innate immunesystem also appears to contribute to hypertension. We propose aworking hypothesis linking the sympathetic nervous system, immunecells, production of cytokines, and, ultimately, vascular and renaldysfunction, leading to the augmentation of hypertension. Studies ofimmune cell activation will clearly be useful in understanding thiscommon yet complex disease.

    T cell; cytokines; angiotensin; subfornical organ; costimulation

    IN THE1960S, a role for the immune system in the developmentof hypertension was first discovered. Several recent investiga-tions have further defined the role of immune system, partic-ularly the adaptive immune system, in hypertension, providednovel insights into the genesis of hypertension, and identifiednovel targets for the treatment of hypertension. The purpose ofthis review was to summarize recent discoveries by our labo-ratory and others on the role of the immune system in hyper-tension.

    Early Studies in Immunity and Hypertension

    The concept that the immune system contributes to hyper-tension had its genesis in the 1960s, when Grollman et al. (40,56) demonstrated that immunosuppression blunted hyperten-sion in a model of renal infarction and that transfer of lym-phocytes from rats with renal infarction induced hypertensionin previously nonhypertensive animals. Later, Svenson foundthat hypertension was not maintained in thymectiomized or

    athymic nude mice with renal infarction (46). In the 1980s, Baet al. (2) found that transplanting the thymus from a Wistar-Kyoto (WKY) rat to a spontaneously hypertensive rat (SHR)resulted in a decrease in blood pressure in the SHR (2). Bloodpressure was also lowered in SHRs with treatment by eitheranti-thymocyte serum or the immunosuppressive drug cyclo-phosphamide (5, 12). Nerve growth in the thymus of SHR wasfound to be greater than that of WKY rats, suggesting a neuralcomponent of immune cell activation in hypertension (42).Rodruiguez-Iturbe et al. (43) found that immunsupression withmycophenlate mofetil blunted salt-induced hypertension afterANG II infusion. In the early 2000s, Muller and Luft (35, 36,49) conducted a series of investigations showing that NF-B

    and ROS play roles in ANG II-induced end-organ damage.More recently, advances in genetic mouse models and knowl-edge of immunology prepared the way for discoveries thatwould lead to further understanding of the importance of theimmune system in hypertension.

    T Cells and Hypertension

    In 2007, our laboratory (18) published a study demonstratingthat T cells contribute to the development of hypertension. Inthis study, mice lacking recombinase-activating gene 1 (Rag-1/ mice) were used as these mice cannot generate functionalT cell receptors or B cell antibodies and thus lack both T andB lymphocytes. The increase in blood pressure caused by

    either ANG II or DOCA salt was significantly blunted inRag-1/ mice, suggesting that either T or B cells mediateovert hypertension. Rag-1/ mice did not exhibit increasedvascular superoxide production and endothelial dysfunction.The hypertensive response to ANG II was restored whenRag-1/ mice received adoptive transfer of T cells but not Bcells. In wild-type mice, ANG II increased circulating CD69,CCR5, and CD44high T cells, markers of effector memory Tcells. In addition, T cells accumulated in the perivascularadipose tissue of the aorta. The results of this study indicatethat T cells play a major role in hypertension. Supporting therole of T cells in hypertension, severe combined immunodefi-cieny mice have also been shown to be protected againsthypertension and exhibit reduced albuminuria and renal dam-age (10). Recently, Mattson et al. (32) deleted the Rag1 gene inDahl salt-sensitive rat using zinc finger nuclease technologyand have shown that this attenuates blood pressure, albumin-uria, and kidney damage. Thus, T cells seem to contribute tothe development of various forms of hypertension in differentstrains of mice and in rats.

    Role of the Central Nervous System in Immune-MediatedHypertension

    The blood vessels, kidney, and central nervous system(CNS) have all been shown to contribute to the development ofhypertension. Interestingly, T cells may represent a link be-

    Address for reprint requests and other correspondence: D. G. Harrison,Division of Clinical Pharmacology, Dept. of Medicine, Robinson ResearchBldg., Rm. 536, Vanderbilt Univ., Nashville, TN 37232-6602 (e-mail: [email protected]).

    Adv Physiol Educ 38: 2024, 2014;doi:10.1152/advan.00063.2013.

    20 1043-4046/14 Copyright 2014 The American Physiological Society

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    tween these tissues. Lymphoid tissues are rich in sympatheticnerves (14). Ganta et al. (17) have shown that intracerebroven-tricular infusion of ANG II increased sympathetic nerve activ-ity to the spleen and increased expression of multiple cytokinesin the spleen. Our laboratory has preformed a series of inves-tigations on the role of the CNS in mediating T cell activation.

    The circumventricular organs (CVO) are highly vascularized

    and have an incomplete blood-brain barrier and can thereforebe influenced by circulating hormones like ANG II. In addi-tion, the CVO, and in particular, the subfornical organ (SFO),are important in both sending and receiving central signals thatregulate cardiovascular function and electrolyte balance. De-letion of CVO extracellular (ec)SOD, using Cre-lox technol-ogy, provides a model to determine the role of central oxidativestress in hypertension. ecSOD deletion increased ROS levels inthe CVO, increased heart low-frequency to high-frequencyheart rate variability (indicative of increased sympathetic ner-vous activity), and elevated blood pressure (25). In addition,when mice with ecSOD deleted in the CVO were infused withANG II at a dose that does not cause hypertension in normalmice (140 ngkg1min1), blood pressure was significantlyelevated and was accompanied by aortic T cell infiltration.Interestingly, in a separate investigation, when ecSOD wasspecifically deleted in vascular smooth muscle, despite in-creases in vascular ROS, blood pressure and T cell responseswere not altered compared with controls (27).

    NADPH oxidases are major sources of superoxide anionproduction in mammalian cells. The subunit p22phox mediatestrafficking of NADPH oxidase catalytic subunits to the cellmembrane and is required for enzyme complex assembly and,ultimately, superoxide production. Complementing the studiesthat used deletion of ecSOD, our laboratory (26) also deletedp22phox in the SFO in a similar manner. Deletion of p22phox inthe SFO blunted the pressor response to ANG II and decreased

    sympathetic outflow as assessed by heart rate variability. Inaddition, p22phox deletion abolished ANG II-induced aortic Tcell infiltration. This study is in keeping with findings thatintracerebroventricular injections of a superoxide scavengerreduces sympathetic drive, blood pressure, and renal damage insalt-induced hypertension in rats (16).

    Supporting the role of the central nervous system, lesions inthe anteroventral third cerebral ventricle (AV3V), a regionwhich includes the SFO, can prevent ANG II-induced hyper-tension (7, 30). In addition, AV3V lesions protect against Tcell activation and aortic infiltration in response to ANG II(30). This is of particular importance as it demonstrates thatANG II-induced T cell activation is not due to direct actions ofANG II on T cells but rather that central signals are required

    for T cell activation. Interestingly, mice infused with norepi-nephrine become hypertensive and exhibit T cell activation andaortic infiltration even after AV3V lesions. This supports theconcept that sympathetic drive, and its attendant release ofnorepinephrine, likely mediates T cell activation and hyperten-sion. In addition to the important role of the CNS, peripheralmechanisms appear to also contribute to T cell activation andvascular inflammation. Treatment with the vasodilator hydral-zine to normalize blood pressure prevents T cell activation andvascular inflammation induced by ANG II infusion (30). Thissuggests that T cells may respond to elevations in pressure andthat afferent nerves may activate central mechanisms in afeedforward manner to induce CVO oxidative stress, sympa-

    thetic outflow, further T cell activation, and overt hypertension.More recently, T cells have been shown to contribute tostress-induced hypertension (31). We exposed mice to 7 daysof stress using a combination of restraint and cage switching.This stress paradigm resulted in increased blood pressure,activation of circulating T cells, and aortic T cell infiltration.Rag-1/ mice were protected from stress-induced hyperten-

    sion, and adoptive transfer of T cells restored the hypertensiveresponse. These findings underscore the crucial role of theCNS in orchestrating the T cell response leading to hyperten-sion.

    T Cell Subtypes, Cytokines, and Mechanisms of Activation

    The above studies demonstrated that T cells contribute to thedevelopment of hypertension; however, they do not provideextensive insights into the subsets of T cells involved. CD4 Tcells have been generally classified as either T helper (Th)1 orTh2, depending on their activation markers and cytokine pro-duction (34). Th17 cells are a newly characterized subset of Tcells; these cells produce the cytokine IL-17 and contribute to

    numerous autoimmune diseases, obesity, and cardiovasculardisease (13, 48, 57). To investigate the role of IL-17 inhypertension, our group studied IL-17a/ mice. These miceexhibited a similar initial increase in blood pressure as wild-type mice in response to ANG II; however, after 7 days, bloodpressure dropped in IL-17a/ mice (28). The ANG II-inducedaortic T cell infiltration observed in wild-type mice was abol-ished in IL-17a/ mice, as were increases in vascular oxida-tive stress and endothelial dysfunction. Recent reports haveshown that direct infusion of IL-17a mediated hypertensionand endothelial dysfunction in mice (37) and that IL-17 medi-ated placental oxidative stress, resulting in hypertension duringpregnancy in rats (11).

    In addition to IL-17, other cytokines have been implicated inthe pathogenesis of hypertension. Etanrecept, a TNF- antag-onist, is effective in preventing hypertension (18, 50, 52). IL-6knockout mice are also protected from ANG II-induced hyper-tension (6, 24, 45). Interferon (IFN)- is upregulated in thekidneys of hypertensive mice (10), and inhibition of IFN-prevents ANG II-induced end-organ damage (29). Taken to-gether, these observations suggest that hypertension is medi-ated by multiple proinflammatory T cell subsets. In accordancewith this concept, T regulatory (Tregs) cells, which act torestrain proinflammatory T cells, attenuate hypertension-in-duced end-organ damage in mice (22) and blunt hypertensionin rats (53).

    Classically, T cells require two signals for activation: 1) interaction

    of the T cell receptor with an antigen presented in the contextof a major histocompatibilty complex and 2) stimulation ofcostimulatory molecules on the T cell by ligands on theantigen-presenting cell (1). A major costimulatory molecule onT cells is CD28, which is bound by the B7 ligands CD80 andCD86 of the antigen-presenting cell. Ligation of the T cellreceptor in the absence of costimulation leads to T cell apo-ptosis (15). The pharmacological agent CTLA4-Ig inhibitscostimulation by binding to B7 ligands on antigen-presentingcells. To determine whether costimulation plays a role inhypertension, our laboratory used both pharmacological inhi-bition of costimulation with CTLA4-Ig and a genetic approachwith B7-deficient (B7/) mice. CTLA4-Ig treatment blunted

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    blood pressure, T cell activation, and vascular infiltration inboth ANG II- and DOCA salt-induced hypertension (54).CTLA4-Ig treatment also abolished T cell production ofTNF- and IFN- induced by ANG II. Similar results wereobserved in B7/ mice, which lack B7 ligands. These obser-vations suggest that T cell receptor ligation and costimulationare necessary for T cell activation in hypertension.

    The Innate Immune System and Hypertension

    The role of the adaptive immune system in experimentalhypertension has been well characterized; however, less isknown about the role of the innate immune system. Recently,Abboud et al. (19) demonstrated that, in WKY rats, the chole-neric agonist nicotine results in an anti-inflammatory responsein splenic macrophages; in contrast, nicotine induced a proin-flammatory response in macrophages from SHRs and enhancedToll-like receptor-mediated cytokine release. In addition,perivascular macrophage infiltration has been observed in ex-perimental hypertension in mice (3). Inflammatory cytokines,IL-1, and IL-6 are elevated in SHRs compared with WKY

    rats; this can be reversed by treatment with an angiotensin-converting enzyme inhibitor (33). Similarly, ANG II receptorblockade prevented lipopolysaccharide-induced inflammatoryresponses of innate immune cells in the rat spleen (44). Inhumans, white blood cells from essential hypertensive patientsproduced more IL-1and IL-6 when stimulated with lipopoly-saccharide compared with controls (41). These observationsare consistent with monocyte activation in hypertension. Howthe innate and adaptive immune systems interact in the devel-opment of hypertension is not well understood and is animportant topic for future study.

    The Immune System and Preeclampsia

    Preeclampsia is characterized by the onset of hypertensionduring pregnancy accompanied by proteinuriea. Preeclampsiais associated with the production of autoantibodies that stim-ulate the ANG II type 1 (AT1) receptor (55), and infusion ofthese antibodies can induce preeclampsia-like symptomps inpregnant mice (60). More recently, it has been shown that aspecific subset of B cells produces these antibodies (21).Depletion of B cells using the anti-CD20 antibody rituximabblunts the blood pressure response in the reduced uterineperfusion pressure rat model of preeclampsia (23). Adoptivetransfer of CD4 T cells from reduced uterine perfusionpressure rats to normal pregnant rats results in increased bloodpressure (39). This response is blunted by either rituximab orAT1 antagonism, suggesting an important role of cross-talk

    between T and B cells in preeclampsia. Supporting the role ofT cells in preeclampsia, mice deficient in the cytokines IL-4 orIL-10, which skew T cells to an anti-inflammatory phenotype,develop preeclampsia-like symptoms when pregnant (8, 9).The proinflammatory cytokine IL-17 mediates placental oxi-dative stress and increases in blood pressure in pregnant rats(11). Together, these observations support a role for the adap-tive immune system in preeclampsia where T and B cells act ina synergistic manner.

    Pulmonary Hypertension and the Immune System

    It has long been postulated that autoimmunity and inflam-mation is involved in pulmonary hypertension (38). In addi-

    tion, T cells, B cells, and macrophages are present in the lungsof patients with pulmonary hypertension (51). Recently, a roleof anti-inflammatory Tregs cells has been indentified in exper-imental pulmonary hypertension (47). In this study, in responseto VEGF receptor 2 antagonism, athymic rats, which lack Tcells, developed perivascular inflammation, including infiltra-tion of B cells and macrophages in the lung and pulmonary

    hypertension. The authors then reconstituted different T cellsubsets in these animals and found that CD4 Tregscells actedto blunt pulmonary vascular inflammation and the developmentof pulmonary hypertension. In a similar manner, Tregs cellsappear to act to restrain experimental systemic hypertension inboth mice and rats (3, 22, 53).

    The Immune System in Human Hypertension

    Although the majority of studies implicating the immunesystem in hypertension have been performed in experimentalanimals, a limited number of investigations have examined therole of the immune system in human hypertension. IL-6 andTNF- are positively correlated with blood pressure in humans

    (4). In a small study, patients with either rheumatoid arthritis orpsoriasis who also had essential hypertension were treated withmycophenlate mofetil, resulting in significantly lowered sys-tolic and diastolic blood pressure (20). Recently, circulatingproinflammatory CD8 T cells have been indentified in hyper-tensive patients (58). These cells generate IFN- and TNF-and exhibit loss of CD28 and gain of CD57, which is consistentwith a proinflammatory, senescent T cell phenotype. Thesepatients also exhibited increased circulating chemokines,which serve as T cell attractants.

    Conclusions and Future Directions

    In summary, it has been known for almost 50 yr that immunecells contribute to hypertension; in the last several years,investigations from our group and others have demonstratedthe importance of T cells in the development of hypertension.In light of the data discussed here, we have formulated aworking hypothesis for the development of overt hypertension.As shown in Fig. 1, hypertensive stimuli, such as ANG II orsalt, leads to an initial elevation in blood pressure, consistent

    T cell

    Hypertensive stimuli

    ANG II, salt, stress, aldosterone

    CNS inflammation and

    oxidative stress

    Vasoconstriction

    Vascular hypertrophy

    Sympathetic outflow

    Sodium

    Volume Retention

    Pre-hypertension - Barotrauma

    Neoantigen formation and

    presentation by dendritic cells

    Severe hypertension

    Fig. 1. Working hypothesis describing the role of immune cells in hyperten-sion. CNS, central nervous system.

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    with clinical prehypertension, which results in protein mod-ifications, possibly due to oxidative modifications. These al-tered proteins serve as neoantigens that no longer recognized asself, are processed and presented by dendritic cells, and pro-mote T cell activation. In concert, afferent signals to the CNSresult in increased sympathetic outflow contributing to T cellactivation. Activated T cells infiltrate the kidney and vascula-

    ture and produce cytokines that promote renal Na

    and waterretention and, in the vasculature, vasoconstriction and remod-eling. Together, these alterations result in overt hypertension.The observation that hydralizine treatment abolished the T cellresponse suggests that signals from the periphery operate in afeedforward manner to signal the CNS to increase centralsympathetic drive and mediate overt hypertension. An impor-tant point is that the T cell response is independent of themodel of experimental hypertension, T cell responses havebeen observed in mice in response to ANG II, DOCA salt, andnorepinephrine. In rats, this response has been observed in bothsalt-sensitive and genetic models. Emphasizing this point is therecent study of Zhang et al. (59), where ANG II receptors werespecifically deleted in mouse T cells using Cre-lox technology.These mice were not protected against ANG II-induced hyper-tension, and, surprisingly, kidney damage in response to ANGII was exacerbated (59). These observations indicate that the Tcell response in hypertension is independent of direct actions ofANG II on T cells. We believe, based on the studies of theCNS, that central signals mediate T cell activation in a varietyof hypertension models. Recent observations by Abboud et al.(19) have suggested that central signals regulate the innateimmune system in hypertension as well. It should be noted thatthe model for the immue system in hypertension outlined hereis a working hypothesis; the precise mechanisms, particularlythe initiating factors in the development of hypertension, are asyet unknown. Our hypothesis will almost certainly require

    refinement as new information comes available.

    DISCLOSURES

    No conflicts of interest, financial or otherwise, are declared by the author(s).

    AUTHOR CONTRIBUTIONS

    Author contributions: D.W.T. and D.G.H. conception and design of re-search; D.W.T. and D.G.H. prepared figures; D.W.T. and D.G.H. draftedmanuscript; D.W.T. and D.G.H. approved final version of manuscript.

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