Revisão Acesso aberto Revisado por pares

The Polymorphonuclear Leukocyte and the Abdominal Aortic Aneurysm

2005; Lippincott Williams & Wilkins; Volume: 112; Issue: 2 Linguagem: Inglês

10.1161/circulationaha.105.553370

ISSN

1524-4539

Autores

M.David Tilson,

Tópico(s)

Cardiac and Coronary Surgery Techniques

Resumo

HomeCirculationVol. 112, No. 2The Polymorphonuclear Leukocyte and the Abdominal Aortic Aneurysm Free AccessEditorialPDF/EPUBAboutView PDFView EPUBSections ToolsAdd to favoritesDownload citationsTrack citationsPermissions ShareShare onFacebookTwitterLinked InMendeleyReddit Jump toFree AccessEditorialPDF/EPUBThe Polymorphonuclear Leukocyte and the Abdominal Aortic AneurysmA Neglected Cell Type and a Neglected Disease M. David TilsonIII, MD M. David TilsonIIIM. David TilsonIII From the Departments of Surgery at Columbia University and St. Luke's Roosevelt Hospital, New York, New York. Originally published12 Jul 2005https://doi.org/10.1161/CIRCULATIONAHA.105.553370Circulation. 2005;112:154–156Companion reports in this issue of Circulation under the senior authorship of G.R. Upchurch1,2 address the possible roles of polymorphonuclear (PMN) cells in the pathogenesis of the nonspecific abdominal aortic aneurysm (AAA). As the authors observe, the AAA is the 10th leading cause of death in white men ages 65 to 74, according to the 2000 National Vital Statistics report, and there were 36 000 surgical repairs.See pp 232 and 241A study has addressed the state of National Institutes of Health (NIH) funding for research on specific diseases in relation to their burden on public health.3 The 3 leading causes of mortality (ischemic heart disease, lung cancer, and stroke; with a cumulative estimated 4877 "years of life lost") received ≈$500 million altogether in NIH research support in the year 1990. The 3 rank-ordered leaders in receipt in NIH funding (AIDS, breast cancer, and dementia; with a cumulative estimated 1504 "years of life lost") received ≈$21 billion dollars in NIH research support. Among the 29 diseases rank-ordered by NIH support, the AAA was not present. In the history of NIH funding for AAA research, there has been only one request for proposals. It is not immediately obvious why research on the causes and prevention of AAA has been so neglected.Perhaps the reason is the deeply embedded notion that the AAA is simply a late degenerative phase of atherosclerosis. Recent editions of major textbooks on pathology4 and medicine5 still offer the "atherosclerotic" explanation for AAA causation. A student of the editorialist has traced references for this explanation back to a treatise by Scarpa, written in Italian and translated into English in 1808. Vascular clinicians know from observation that AAA, or for that matter, lesions that begin as poststenotic dilatations (eg, an aneurysm of the subclavian artery distal to a cervical rib) will become atherosclerotic over time. Atherosclerotic degeneration of an aneurysm may be the result of boundary layer separations and turbulence at the flow surface6; there is also the circumstance of shared risk factors.Atherosclerotic occlusive disease (AOD) and AAA share 2 risk factors: smoking and hypertension.7 There is 1 risk factor that is divergently shared; diabetes mellitus is a positive risk factor for AOD and a negative risk factor for AAA. There has been little scientific evidence that the 2 positively shared risk factors operate through the same molecular mechanisms. When a probable cause has joint observable effects, the conclusion that one observable effect has caused the other has been called the "fallacy of spurious causation."8 The Joint Committee of the Society for Vascular Surgery and the North American Chapter of the International Cardiovascular Surgery on "Reporting Standards for Aortic Aneurysm" took the positive step in 1991 of recommending that the usual term "atherosclerotic aneurysm" be replaced by the term "nonspecific aneurysm" because there was so little evidence that atherosclerosis actually causes aneurysmal disease.9The contemporary period of AAA research may have been initiated by the editorialist in a publication in 1980, which compared profiles of 50 patients with AAA with 50 patients with AOD.10 The characteristics of these 2 populations were so divergent that the author speculated that AOD and AAA were 2 different disease processes. It was unwritten knowledge at the time that vessels that are aneurysm susceptible (eg, the internal iliac artery and the popliteal artery) are relatively AOD resistant, whereas vessels that are aneurysm resistant (eg, the external iliac artery) are highly AOD susceptible. It is interesting that aneurysm-susceptible versus aneurysm-resistant vessels have different embryological anlage, which has become a new subject for molecular aneurysm research. There are not only artery-specific antigenic proteins but also segment-specific arterial proteins.11 The conclusions of the editorialist in 1980 had been anticipated in an article by R.M. Greenhalgh and coworkers in 1975, who noted differences in the lipid profiles of patients with "atherosclerotic dilating" versus "atherosclerotic stenosing" disease12; however, these authors did not make the leap to considering the possibility that there might be fundamental differences in the pathogenesis of AOD versus AAA.Another anticipatory communication was the report by Clifton in 1977 that 3 brothers had died of ruptured AAAs.13 In the early 1980s, there were publications that took a more general approach to the possibility that there were genetic susceptibility factors for AAA. The editorialist initially reported 16 situations of familial clustering of AAA and then 50 more collected family histories.14 Shortly thereafter, there was a more rigorous report by Johanson and coauthors that left little doubt about the importance of genetic susceptibility factors. That study included a control group in which the families of patients with aortic AOD were also studied.15 A positive family history was 6 times more common among the AAA probands than among the AOD probands. The race was then on among several laboratories in the United States and abroad to find the "the aneurysm gene."As most readers know, there are 2 approaches to gene discovery in relation to diseases. The "reverse" approach is based on genome-wide screening in large kindreds who manifest the disease of interest at a young age or sibling-pair analysis in diseases of older age. One by one, chromosomes are ruled out, and then the focus narrows to the so-called hot spots on the chromosomes with the highest LOD scores. Helena Kuivaniemi and colleagues have been leaders in this field. Dr Kuivaniemi tells the editorialist that there may be 6 or more hot spots in the human genome for aneurysm susceptibility (H. Kuivaniemi, oral communication, November 2002). Recently, this group reported that a locus at chromosome 19q13.3 is a susceptibility factor for both cerebral aneurysm and AAA.16,17 This locus alone is neither necessary nor sufficient to cause either disease, but it may increase susceptibility for both. The gene at that locus is the ferritin light chain, and our research group has reported 3 nucleotide substitutions in the mRNA of the ferritin light chain (resulting in 2 codon changes) in a cDNA expression library derived from fibroblasts of an AAA surgical specimen (Genbank accession No. AY207005).The other method is the "candidate gene" approach, which is more feasible for a small laboratory like our own. The TIMP-1 gene was ruled out in 1993.18 Meanwhile, as several publications began to appear on the role of inflammation and autoimmune mechanisms in AAA,19–22 the laboratory of the editorialist made a preliminary communication on the possible role of HLA DR-2 as a risk factor.23 This candidate, presently known as HLA DR-B1-15, based on molecular typing, has been confirmed by 2 larger studies.24,25 Thus, if 2 candidates are tentatively identified, at least 4 more remain to be discovered.The companion articles in this issue of Circulation1,2 on the role of the PMN use the elastase-infusion technique for initiating aortic injury in small animals (rats and mice), which is often referred to as the Anidjar/Dobrin model. The initial invasive insult leads to AAA formation, which develops over a period of 4 days to 4 weeks, dependent on experimental conditions. A cascade of inflammatory events with multiple molecular messages (some of which are known, whereas others remain unknown) results in the failure of adventitial collagen and permits enlargement to aneurysmal dimensions. The importance of the adventitial collagen in preventing aortic ballooning, even after nearly complete destruction of the integrity of the media (by either surgical endarterectomy or enzymatic elastolytic activity) is supported by clinical experience and experimental evidence. Although little elastin is detectable by histochemical techniques within 24 hours after elastase-infusion treatment, the time period for aneurysmal dilatation is generally ≈1 week.26As in the case of the adventitial fibroblast and its collagen products, the role of PMN has been neglected in research on the pathogenesis of the AAA. The importance of the aneurysm-infiltrating macrophage cell has been recognized for more than a decade, in particular for its production of the elastin-destructive enzyme matrix metalloproteinase-9.27,28The present communications in this issue of Circulation lift the level of the discourse on the role of PMN to a new plateau. l-Selectin–knockout mice were significantly more AAA resistant than were wild-type controls.2 Fewer macrophages appear to have been recruited to the injured aorta, and aortic dilation was either prevented or delayed. Convergent conclusions may be drawn from the companion contribution.1 PMN depletion in C57BL6 mice by pretreatment with an anti-PMN antibody induced neutropenia and also conferred AAA resistance in the Anidjar/Dobrin model. For reasons that are unclear, there was also the surprising finding that there were no differences in matrix metalloproteinase-2 or matrix metalloproteinase-9 mRNA expression, protein levels, or immunostaining patterns.Although we still see through the glass darkly, the view is slowly becoming less opaque. PMN has become an exciting subject of renewed interest in the pathobiology of AAA, and further studies of its role may add important new pieces to the puzzle. As other investigators are intensifying the search for AAA susceptibility genes in humans, the regulation of PMN recruitment becomes a new candidate for molecular analysis. For example, if there is heterogeneity for l-selectin in the genome or if there are tissue-specific splicing events for variants of l-selectin), allowing some PMNs to bind more avidly to the aorta than others, then another aspect of the AAA enigma may come to light.The opinions expressed in this article are not necessarily those of the editors or of the American Heart Association.FootnotesCorrespondence to Dr M. David Tilson, St. Luke's Roosevelt Hospital Center, 1000 Tenth Ave, New York, NY 10019. E-mail [email protected] References 1 Eliason JL, Hannawa KK, Ailawadi G, Sinha I, Ford JW, Deogracias MP, Roelofs KJ, Woodrum DT, Ennis TL, Henke PK, Stanley JC, Thompson RW, Upchurch GR Jr. Neutrophil depletion inhibits experimental abdominal aortic aneurysm formation. Circulation. 2005; 112: 232–240.LinkGoogle Scholar2 Hannawa KK, Eliason JL, Woodrum DT, Pearce CG, Roelofs KJ, Grigoryants V, Eagleton MJ, Henke PK, Wakefield TW, Myers DD, Stanley JC, Upchurch GR Jr. l-Selectin-mediated neutrophil recruitment in experimental rodent aneurysm formation. Circulation. 2005; 112: 241–247.LinkGoogle Scholar3 Gross CP, Anderson GF, Powe NR. The relation between funding by the National Institutes of Health and the burden of disease. N Engl J Med. 1999; 340: 1881–1887.CrossrefMedlineGoogle Scholar4 Schoen FJ. The blood vessels. In: Kumar VR, Abbas AK, Fausto N, eds. Robbins and Cotran's Pathologic Basis of Disease. 7th ed. Philadelphia, Pa: W.B. Saunders; 2004: 531–532.Google Scholar5 Isselbacker EM. Diseases of the aorta. In: Goldman L, Ausiello D, eds. Cecil Textbook of Medicine. 22nd ed. Philadelphia, Pa: W.B. Saunders; 2004: 460–462.Google Scholar6 Tilson MS, Sumpio BE. Do aneurysms cause atherosclerosis? 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Differences in results for aneurysm vs. occlusive disease after bifurcation grafts: results of 100 elective grafts. Arch Surg. 1980; 115: 1173–1175.CrossrefMedlineGoogle Scholar11 Chew DK, Knoetgen J III, Xia S, Gaetz HP, Tilson MD. Regional distribution in humans of a novel aortic collagen-associated microfibrillar protein. Exp Mol Pathol. 1999; 66: 59–65.CrossrefMedlineGoogle Scholar12 Greenhalgh RM, Taylor GW, Kaye J. A comparison of fasting serum lipid concentrations and lipoprotein patterns in patients with stenosing and dilating forms of peripheral arterial disease. J Cardiovasc Surg (Torino). 1975; 16: 150–151.MedlineGoogle Scholar13 Clifton MA. Familial abdominal aortic aneurysms. Br J Surg. 1997; 63: 765–766.Google Scholar14 Tilson MD, Seashore MR. Fifty families with abdominal aortic aneurysms in two or more first-order relatives. Am J Surg. 1984; 147: 551–553.CrossrefMedlineGoogle Scholar15 Johansen K, Koepsell T. Familial tendency for abdominal aortic aneurysms. JAMA. 1986; 256: 1934–1936.CrossrefMedlineGoogle Scholar16 Shibamura H, Olson JM, van Vlijmen-Van Keulen C, Buxbaum SG, Dudek DM, Tromp G, Ogata T, Skunca M, Sakalihasan N, Pals G, Limet R, MacKean GL, Defawe O, Verloes A, Arthur C, Lossing AG, Burnett M, Sueda T, Kuivaniemi H. Genome scan for familial abdominal aortic aneurysm using sex and family history as covariates suggests genetic heterogeneity and identifies linkage to chromosome 19q13. Circulation. 2004; 109: 2103–2108.LinkGoogle Scholar17 Wills S, Ronkainen A, van der Voet M, Kuivaniemi H, Helin K, Leinonen E, Frosen J, Niemela M, Jaaskelainen J, Hernesniemi J, Tromp G. Familial intracranial aneurysms: an analysis of 346 multiplex Finnish families. Stroke. 2003; 34: 1370–1374.LinkGoogle Scholar18 Tilson MD, Reilly JM, Brophy CM, Webster EL, Barnett TR. Expression and sequence of the gene for tissue inhibitor of metalloproteinases in patients with abdominal aortic aneurysms. J Vasc Surg. 1993; 18: 266–270.CrossrefMedlineGoogle Scholar19 Rizzo RJ, McCarthy WJ, Dixit SN, Lilly MP, Shively VP, Flinn WR, Yao JS. Collagen types and matrix protein content in human abdominal aortic aneurysms. J Vasc Surg. 1989; 10: 365–373.CrossrefMedlineGoogle Scholar20 Brophy CM, Reilly JM, Smith GJ, Tilson MD. The role of inflammation in non-specific abdominal aortic aneurysm disease. Ann Vasc Surg. 1991; 5: 229–233.CrossrefMedlineGoogle Scholar21 Koch AE, Haines GK, Rizzo RJ, Radosevich JA, Pope RM, Robinson PG, Pearce WH. Human abdominal aortic aneurysms: immunophenotypic analysis suggesting an immune-mediated response. Am J Pathol. 1990; 137: 1199–1213.MedlineGoogle Scholar22 Gregory AK, Yin NX, Capella J, Xia S, Newman KM, Tilson MD. Features of autoimmunity in the abdominal aortic aneurysm. Arch Surg. 1996; 131: 85–88.CrossrefMedlineGoogle Scholar23 Tilson MD, Ozsvath KJ, Hirose H, Xia S. A genetic basis for autoimmune manifestations in the abdominal aortic aneurysm resides in the MHC class II locus DR-beta-1. Ann N Y Acad Sci. 1996; 800: 208–215.CrossrefMedlineGoogle Scholar24 Hirose H, Takagi M, Miyagawa N, Hashiyada H, Noguchi M, Tada S, Kugimiya T, Tilson MD. Genetic risk factor for abdominal aortic aneurysm: HLA-DR2(15), a Japanese study. J Vasc Surg. 1998; 27: 500–503.CrossrefMedlineGoogle Scholar25 Rasmussen TE, Hallett JW Jr, Schulte S, Harmsen WS, O'Fallon WM, Weyand CM. Genetic similarity in inflammatory and degenerative abdominal aortic aneurysms: a study of human leukocyte antigen class II disease risk genes. J Vasc Surg. 2001; 34: 84–89.CrossrefMedlineGoogle Scholar26 Halpern VJ, Nackman GB, Gandhi RH, Irizarry E, Scholes JV, Ramey WG, Tilson MD. The elastase infusion model of experimental aortic aneurysms: synchrony of induction of endogenous proteinases with matrix destruction and inflammatory cell response. 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