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Brief Reviews |
From The Donald W. Reynolds Cardiovascular Clinical Research Center, Cardiovascular Division, Department of Medicine (K.S., P.L.), and Department of Pathology (R.N.M.), Brigham and Womens Hospital, Harvard Medical School, Boston, Mass.
Correspondence to Koichi Shimizu, MD, PhD, Cardiovascular Division, Brigham and Womens Hospital, Harvard Medical School, 77 Avenue Louis Pasteur, NRB7, Boston, MA 02115. E-mail ksmz{at}rics.bwh.harvard.edu
Series Editor: Robert W. Thompson
Abdominal Aortic Aneurysms: Pathophysiological Mechanisms and Clinical Implications
ATVB In Focus
Previous Brief Reviews in this Series:
Powell JT, Brady AR. Detection, management, and prospects for the medical treatment of small abdominal aortic aneurysms. 2004;24:241245.
Daugherty A, Cassis LA. Mouse models of abdominal aortic aneurysms. 2004;24:429434.
Pasterkamp G, Galis ZS, de Kleijn DPV. Expansive arterial remodeling: location, location, location. 2004;24:650657.
| Abstract |
|---|
(IFN-
) signaling developed AAA correlating with skewed Th2 cytokine environments, suggesting important regulatory roles for Th1/Th2 cytokine balance in modulating matrix remodeling and important implications for the pathophysiology of aortic aneurysm and atherosclerosis. Further probing of their distinct aspects of immune and inflammatory responses in vascular diseases should continue to shed new light on the pathophysiologic mechanisms that give rise to aneurysmal versus occlusive manifestations and atherosclerosis. Th1/Th2 cytokine balance plays important regulatory roles in modulating matrix remodeling in vascular diseases. These distinct aspects of immune and inflammatory responses in vascular diseases should continue to shed new light on the pathophysiologic mechanisms that give rise to aneurysmal versus occlusive manifestations and atherosclerosis.
Key Words: aortic aneurysm atherosclerosis cytokine pathogenesis T-lymphocytes transplantation
| Introduction |
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Most AAA develop below the renal arteries and end above the bifurcation of the iliac arteries; they typically exhibit a fusiform morphology, with symmetrical circumferential enlargement involving all layers of the aortic wall. Less frequently, aneurysms have a saccular form, with aneurysmal degeneration affecting only part of the aortic circumference. The AAA wall usually becomes laminated with thrombus and its intraluminal diameter often appears relatively normal by angiography. Important histological features of aneurysms include chronic adventitial and medial inflammatory cell infiltration, elastin fragmentation and degeneration, and medial attenuation. Collagen (especially types I and III) in the media and adventitia provides tensile strength to the aortic wall. Collagen synthesis increases during the early stages of aneurysm formation, suggesting a repair process.4 However, in later stages, collagen degradation exceeds its synthesis (accompanied by excessive degradation of other extracellular matrix macromolecules, notably elastin), ultimately favoring AAA rupture. Indeed, AAA exhibit increased local production of enzymes capable of degrading collagen and elastin extracellular matrix proteins.57
In AAA, inflammatory cells (polymorphonuclear neutrophils, T cells, B cells, macrophages, mast cells, NK cells, etc) percolate through the luminal thrombus and all layers of the wall.8,9 These infiltrating cells secrete various humoral inflammatory factors, including cytokines, chemokines, leukotrienes, reactive oxygen species, and immunoglobulins. The vessels of the vasa vasorum form the pathways by which inflammatory cells access the aortic intima and media.10 Medial neovascularization and decreased vascular smooth muscle cells also characterize AAA lesions. The intraluminal thrombus may contribute to the process by causing a functional hypoxia at the luminal intima and inner media, thus inducing subsequent neovascularization and inflammation.11 Inflammatory cells in the thrombus also release active proteases such as matrix metalloproteinase (MMP)-9 and urokinase-type plasminogen activator (u-PA).12
Recent human studies indicate that human AAAs comprise an inflammatory disease characterized by the predominance of T helper cell type 2 (Th2) cytokine expression and the paucity of Th1 cytokines, especially interferon-
(IFN-
).13 This review focuses on the role of specific cytokines produced by inflammatory cells within AAA as well as the downstream pathways they induce to form aneurysmal lesions.
| Risk Factors of AAA |
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| Inflammatory Aneurysm and Atherosclerotic Aneurysm |
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Leukocyte recruitment and expression of pro-inflammatory cytokines characterize early atherogenesis.1 AAA typically arise in the setting of severe atherosclerosis,33 and several studies suggest that the aneurysmal disease may progress from occlusive disease.34 Because AAA frequently coexist with generalized atherosclerosis, they are frequently termed "atherosclerotic aneurysms."35,36 Nevertheless, the majority of patients with advanced atherosclerosis do not develop AAA; conversely, some patients lacking substantial atherosclerosis develop AAA.
The prevalence of abdominal aortic atherosclerosis greatly exceeds that of AAA. AAA occurs in 48% of men older than 60 years,37 whereas only 4.3% to 7.7% of men aged 65 to 80 years have AAA.38 Thus, only 9% to 16% of patients with atherosclerotic abdominal aortas develop AAA. Consequently, atherosclerosis per se probably does not directly cause AAA but may provide the first inflammatory triggers to recruit inflammatory cells and direct their subsequent heightened elaboration of further mediators (eg, proteases, reactive oxygen species). Although aneurysmal and occlusive diseases demonstrate common pathologic features and share common risk factors, the specific pathogenesis of aortic aneurysm versus aortic occlusive disease remains ill- defined.
| Collagenases and Elastases Associate With Aortic Aneurysm Development |
|---|
50 years), loss of elastin in adults almost certainly results from increased elastolysis rather than insufficient synthesis.7,41 Nevertheless, elastogenesis in atherosclerosis may also be defective, producing poorly cross-linked immature elastin.42,43 Elastic fibers can degenerate and alter their structure through aging;44 elastolysis could also expose neoantigens that might provoke an autoimmune response. Tropoelastin and various elastin-derived peptides may also mediate neutrophil, fibroblast, and monocyte/macrophage chemotaxis.4547 MMP (MMP-1, -2, -3, -9, -12, and -13),6,41,4851 serine proteases (tissue-type plasminogen activator [t-PA]; u-PA; plasmin; and neutrophil elastase),35,5255 as well as cysteine proteases (cathepsin D, K, L, and S)5659 all localize in aneurysm walls at concentrations higher than occur in normal or stenotic atherosclerotic arteries. Endothelial cells (ECs), SMCs, fibroblasts, or macrophages can all produce these proteinases.35,57,59,60 CD40 ligation on inflammatory and vessel wall cells induces MMPs as well as neutrophil elastase from human vascular EC and monocyte/macrophages.54
MMPs are initially secreted as inactive zymogens (pro-MMP), requiring activation in the extracellular compartment. Similarly, 2 plasminogen activators (t-PA and u-PA) generate plasmin from the inactive precursor plasminogen. Plasmin, a serine proteinase with little direct elastolytic or collagenolytic activity, can indirectly induce ECM degradation by activating MMPs.61 Cathepsins S and K have potent elastolytic activity, and cathepsin L can degrade type IV and V collagen, laminin, elastin, and proteoglycans.59,62 Notably, levels of cystatin C (a major inhibitor of the cysteinyl elastases, cathepsins S and K) decrease in human AAA57; mice lacking cystatin C show increased elastic fragmentation with resulting ectasia in atherosclerotic aortas.63
| Immunologic Aspects of AAA |
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T cell recruitment with expression of pro-inflammatory Th1 cytokines typically characterizes early atherogenesis and stenotic atherosclerotic plaque.1,66 CD4+ T cells secrete IL-2, causing activation and proliferation of T and B cells.67 However, potential mechanistic differences in immune and inflammatory pathways in stenotic versus aneurysmal manifestations of atherosclerosis remain unexplained. Recent studies showed a shift toward Th2 responses in human AAA compared with stenotic atheromas.13
| Pattern of Cytokine Expression in Aortic Occlusive and Aneurysmal Disease |
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or IL-4 that drive opposing effects on a variety of biological processes. CD4+ Th1 cells and CD8+ T-cytotoxic type-1 (Tc1) cells characteristically produce IFN-
, IL-2, and tumor necrosis factor, whereas Th2 and Tc2 cells secrete IL-4, IL-5, IL-10, and IL-13. Th1 cytokines tend to drive cellular inflammatory responses including macrophage activation. The Th2 cytokines play important roles in distinct inflammatory processes, particularly in the pathogenesis of allergy, asthma, and atopic dermatitis; they also inhibit certain forms of autoimmunity.69 T cell responses polarize toward a Th1/Tc1 phenotype in the presence of IFN
, whereas IL-4 predisposes to Th2/Tc2 T cell responses.70 Because IL-4 and IL-13 have a similar 3-dimensional structure and share receptor complexes, they have overlapping but pleiotropic functions, including enhanced B cell proliferation and isotype-switching as well as antagonism of the effects of IFN-
, induction of dendritic cell differentiation, T cell proliferation and differentiation, and enhanced production of certain chemokines (eg, IL-8/CXCL8, MCP1/CCL2, and RANTES/CCL5) from ECs and SMCs.71 In addition to Th2 and Tc2 lymphocytes, various other cell types including B cells, NK cells, mast cells, basophils (IL-4 and IL-13), and endothelial cells as well as macrophages (IL-10) produce Th2-type cytokines.72,73 Besides the cytokine mediators already described, pluripotent eicosanoid lipid mediators including prostaglandins (PG) and leukotrienes may contribute to AAA. These mediators derive from arachidonic acid by action of cyclooxygenase and 5-lipoxygenase (5-LO) respectively and associate with a variety of inflammatory processes, including allergic reactions and atherosclerosis.7476 Interestingly, deficiency of 5-lipoxygenase attenuates aneurysm formation of atherosclerotic apolipoprotein E-deficient mice,77 suggesting a role for the 5-LO pathway in AAA formation. Significantly, the PG mediators can also modulate Th2 cytokine production; for example, a murine asthma model showed that PGD2 augments Th2 type inflammation by inducing macrophage-derived chemokine.78 Two receptors for PGD2 exist, namely the D prostanoid (DP) receptor (DP1 and DP2) and the chemoattractant receptor-homologous molecules that are expressed on Th2 cells (CRTH2). In humans, DP2 preferentially localizes on Th2 cells, eosinophils, and basophils and mediates chemotaxis in vitro, suggesting that DP2 promotes Th2-related inflammation.7981
Reactive oxygen species may also contribute to the pathogenesis of AAA. In humans, levels of superoxide anion (O2) significantly increased in AAA lesions compared with tissue from adjacent nonaneurysm or normal control aortas.82 In animal models, reactive oxygen species initiate Th2 type autoimmune responses; antioxidant treatment suppressed vasculitis and IgE production in this model.83
Th1 and/or Th2 cytokines produced by inflammatory cells conceivably could influence the outcome of arterial inflammation. Several studies demonstrated elevated circulating levels of IL-1, IL-6, tumor necrosis factor-
, or IFN-
in patients with AAA, and also specifically implicated these cytokines in AAA pathogenesis.84,85 Another human study demonstrated increased expression of IFN-
and undetectable Th2 cytokines in tissue extracted from ascending thoracic aortic aneurysms (TAA).86 DNA array analysis using human tissue showed that the altered pattern of gene expression observed in TAA is distinguishable from that observed in AAA, suggesting that TAA and AAA are fundamentally different pathophysiologic entities at a molecular level.87 Conversely, other human studies showed that Th2 type cytokines (IL-4, IL-5, or IL-10) predominate in human AAA lesions, whereas stenotic atherosclerotic lesions preferentially express Th1 cytokines (IL-2 and IFN-
).13,88 These apparently discordant findings may result from specimen sources (ethnic groups, postmortem material), sampling differences (eg, neck or center of aneurysm), stage of aneurysm formation (early stage <5.5 cm or late stage >5.5 cm in diameter), or tissue preservation conditions.
Such descriptive clinical observations make it difficult to interpret whether increased Th1 cytokines actually cause aneurysm development or simply associate with a precursor atherosclerotic injury. Indeed, Th1 responses might drive occlusive atherosclerosis, whereas a Th2 environment could favor aneurysm formation. Th1 cytokines might even protect against aneurysm development, because IFN-
depleted mice demonstrate markedly augmented inflammatory responses.89
| Cytokines Modulate MMP, Serine Protease, and Cathepsin Expression, and Correlate With AAA Development |
|---|
or IL-4) can induce or inhibit expression of specific MMPs,60 depending on the particular experimental conditions. Such variability requires consideration in determining the applicability of animal models to human AAA disease. For example, IFN-
induces MMP-9 from human melanoma cells,90 but inhibits MMP-991,92 and MMP-129395 production by murine and human macrophages. Th2 cytokines (eg, IL-4 or IL-10) inhibit MMP-1, -2, and -9 production by human macrophages,60,96 whereas IL-4 induces MMP-12 expression by murine macrophages.93 Others report that IL-13 potently induces MMP-2, -9, -12, -13, and -14, and cathepsins B, L, S, H, and K.97,98 IFN-
induces cathepsin S from vascular SMCs,57 whereas IL-4 and IL-13 augment cathepsin L secretion from glomerular visceral epithelial cells.99 IL-4 and/or IL-13 augment u-PA and t-PA expression from vascular ECs,100 SMCs,101,102 and monocyte/macrophages.103,104 With regard to extracellular matrix synthesis, IFN-
inhibits collagen production by SMCs, the principal source of collagen in the arterial wall.105 In all these cases, the isolated cytokine effects are measured in vitro, whereas the integration of effects in a given cytokine milieu in vivo may be distinctively different. Nevertheless, these results also demonstrated that blockade of IFN-
signaling associated with Th2 cytokine skewing alters local MMP and protease activity so as to result in aneurysm formation.
Aortic Aneurysm Formation Correlates With IFN- Signaling Blockade and Increased IL-4
|
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We hypothesized that the cytokine milieu created by specific inflammatory cells (Th1 or Th2 type cytokine-secreting cells) would affect whether an atherosclerotic lesion would become an aneurysmal lesion. To test this hypothesis, we used an immunologically driven model, ie, murine aortic transplantation, to focus local inflammation in allograft aortic segments. Transplantation into wild-type hosts specifically elicits IFN-
predominant responses in the allograft segment93; conversely, transplantation into hosts lacking the IFN-
receptor (GRKO) led to IL-4-dominated responses. Notably, death of medial SMCs caused by rejection does not itself suffice to cause aneurysm formation.109 Thus, although acute rejection causes virtually complete medial SMC death in aortic allografts of wild-type recipient, the transplanted aortas develop not aneurysms but rather intimal hyperplasia.109 In comparison, allografts in GRKO recipients developed profound aneurysmal dilation with medial elastin loss similar to that seen in human AAA. Moreover, in GRKO hosts, IL4 blockade using anti-IL4 antibodies or hosts concurrently lacking IL-4 reduced AAA formation in aortic allografts with associated decreases in elastic tissue fragmentation and in MMP-9 and MMP-12 expression.93 These results suggested important regulatory roles for Th1 and Th2 cytokines in modulating matrix remodeling, and have important implications for the pathophysiology of AAA and atherosclerosis.
The majority of inflammatory cells at early stages of AAA consist of macrophages that express the metalloelastase MMP-12. Macrophages cultured in vitro showed augmented expression of elastolytic MMP-12 in the presence of IL-4; IFN-
co-administration inhibited that effect. These findings and our immunologically driven model further support a central role for IL-4 in AAA formation and suggest that IFN-
attenuates collagenolytic and elastolytic activity. Such results provide new insights into the mechanisms of aneurysmal disease and suggest that IL-4 antagonism could attenuate the formation and/or expansion of arterial aneurysms.
| Triggers for a Cascade of Events Leading to Atherosclerosis and Aortic Aneurysm |
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) potentiate early atherosclerotic development.66 Conversely, Th2 type cytokines and chemokines localize in late stages of the human AAA disease.110 Although our recent study appears to contradict previous results suggesting that IFN-
participates critically in AAA development,111 we emphasize that Th1 cytokines may critically initiate the early accumulation of inflammatory cells. Attenuated production of IFN-
(or other Th1 cytokines) may diminish the early stages of atherosclerotic inflammatory cell recruitment, thus modulating subsequent protease activity and attenuating aneurysm formation. To integrate the current data regarding Th1 versus Th2 effects, we propose the model for AAA development depicted in the Figure. In familial AAA, patients with abnormal ECM components can develop AAA early without concomitant atherosclerosis. In sporadic AAA, however, aneurysmal lesions require initial inflammatory cell recruitment, particularly involving macrophages that will contribute to subsequent ECM degradation. In most cases, the default pathway will be a Th1-dominated obstructive lesion; however, when the local environment is skewed toward Th2 predominance, aneurysms will develop.
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The factors initiating Th2 predominance may associate with the known risk factors for aneurysm development. Aging is one of risk factors for AAA. Innate immune cells produce greater IL-4 with aging.112 Smoking is a potent risk factor of AAA,113 and chronic smoke exposure accelerates enlargement of experimental AAA.114 Interestingly, human peripheral blood mononuclear cells isolated from smokers have elevated IL-4 levels compared with those isolated from nonsmokers.115 Moreover, cigarette smoke induces IL-4 expression from human aortic ECs,116 and cigarette smoke extract inhibits IL-2 and IFN-
production by peripheral blood mononuclear cells.117 Other studies demonstrated that cigarette smoke induces MMP-1,116 MMP-9,118 and MMP-12119 from human endothelial cells, monocytes/macrophages, or epithelial cells. In patients with acute Kawasaki disease, another setting where inflammation potentially drives coronary arterial aneurysm formation, clinical studies report elevated IL-4 and IL-10 levels in the serum and peripheral blood mononuclear cells of these patients.120,121 Interestingly, genetic variation in IL-4 expression may help explain why aneurysm formation occurs in only
25% of Kawasaki disease patients.122,123
Based on these studies, we propose that secondary triggers, eg, smoking and/or genetic predilection, inhibit local IFN-
signaling and/or elicit Th2-dominant cytokine environments (inducing macrophage elastolytic activity) in a subset of patients with aortic atherosclerosis and ultimately result in AAA formation. We foresee elucidating and targeting the secondary triggers or blocking relevant Th2 cytokines, eg, IL-4, as promising strategies for prevention and therapy of AAA.
| Acknowledgments |
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Received September 1, 2005; accepted February 10, 2006.
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