Editorials |
From the Division of Surgical Science, Department of Surgery, College of Physicians & Surgeons, Columbia University, New York.
Correspondence to Ann Marie Schmidt, MD, Division of Surgical Science, Department of Surgery, Columbia University, 630 West 168th Street, P&S 17-501, New York, NY 10032. E-mail ams11{at}columbia.edu
| Introduction |
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See page 1032
| LigandRAGE Axis: Breaking the Cycle |
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B, a key signaling molecule and transcription factor linked to the inflammatory response, respectively, were reduced in sRAGE-treated mice.78 Importantly, these studies provided the first clue that RAGE-dependent inflammatory and tissue-perturbation mechanisms were not limited to the diabetic state. Administration of sRAGE to euglycemic apolipoprotein Enull mice with established atherosclerosis suppressed progression.7 In other studies, administration of sRAGE to diabetic rats subjected to carotid artery balloon injury diminished neointimal expansion, in parallel with decreased proliferation of smooth muscle cells in the expanding neointima.9 As in the case of lipid-driven atherosclerosis, these findings were not limited to the diabetic state. Acute denudation of the femoral artery in euglycemic C57BL/6 mice rapidly upregulated RAGE as well as ligands for the receptor in the injured vessel wall, such as AGEs and S100/calgranulins.10 Key roles for the ligandRAGE axis were shown by suppression of neointimal expansion in the presence of sRAGE. The target of sRAGE was indeed RAGE, as acute arterial injury in wild-type mice treated with antibodies to RAGE, in homozygous RAGE-null mice, or in transgenic mice expressing signal transduction mutant RAGE specifically in smooth muscle cells was significantly decreased compared with vehicle-treated animals or injured littermates.10
Taken together, these studies indicate that in rodent models, upregulation of the ligandRAGE axis contributed to glucose-, lipid- and/or physical stressinduced neointimal expansion.
| From Rodents to Humans? |
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In this issue of Arteriosclerosis, Thrombosis, and Vascular Biology, Falcone and colleagues take the next step in linking RAGE to human atherosclerosis. In two distinct populations of age-matched Italian male subjects without diabetes, these authors show that endogenously lower levels of sRAGE were associated with enhanced risk of coronary artery disease, as detected by angiography.12 The link between levels of sRAGE and coronary artery disease was "dose-dependent," as meticulous statistical analysis suggested that individuals with the very lowest levels of sRAGE displayed the greatest overall risk for disease. The chief limitation of this study is that using antibodies generated generically to RAGE, the authors were unable to distinguish whether the species detected by this assay represented soluble RAGEs, perhaps cleaved/released from full-length endogenous receptor on the cell surface by molecules such as MMPs, and/or novel splice variants of RAGE1315 (Figure 1). Although increased cell surface RAGE in diseased milieux might suggest that levels of sRAGE generated directly from this species should be higher in disease states, not lower, our present lack of understanding of the mechanisms by which sRAGE might be generated from full-length cell surface receptor does not allow us to make conclusions at this time. Further, future studies must delineate that levels of sRAGE are not lower in the diseased population because of sRAGE binding to circulating ligands, thereby diminishing antibody binding to the sRAGE species. This possibility is unlikely, however, given that a polyclonal antibody is included within the sandwich ELISA for detection of sRAGE.
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Furthermore, these studies do not delineate the specific cellular source(s) of sRAGE. In addition to endothelial cells, it is possible that smooth muscle cells and circulating inflammatory cells such as monocytes and lymphocytes, for example, may be generators of sRAGE. A further consideration arises from these possibilities: if there are distinct sRAGE species, is it possible that their affinity for the ligands of the receptor may differ? Irrespective of such caveats, the work of Falcone and colleagues mandates that antibodies and corresponding assays for detection of discrete splice variants of RAGE be developed to best address these hypotheses.
| RAGE & the Lipid Connection? |
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| RAGE & Disease: Is it Really a Multiple Hit Model? |
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| Soluble RAGE: Biomarker or Endogenous Protection Factor? |
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The work of Falcone and coworkers sets the stage for testing novel concepts in the biology of RAGE. Specifically, future studies must address the relationship of endogenous sRAGE to macro- and microvascular complications in human types 1 and 2 diabetes. Further, given that RAGE may play key roles in other inflammatory diseases, such as those triggered by immune stimuli,2,22 measurement of sRAGE in such settings may highlight disease activity and/or the response to therapeutic intervention. Is sRAGE the next CRP? How do levels of sRAGE correlate with other known indices of acute stress and vascular perturbation, such as circulating levels of interleukin (IL)-6, serum amyloid-A, soluble adhesion molecules, or soluble thrombomodulin? Long-term prospective clinical studies in both male and female subjects will be required to test this hypothesis.
Lastly, if the findings of Falcone and colleagues are borne out in such large-scale prospective trials, then sRAGE might, perhaps, be more than just a biomarker. Is it possible that efforts to burgeon endogenous production of sRAGE might provide a therapy for atherosclerosis and other inflammatory disorders linked to the ligand/RAGE axis? Alternatively, is it possible that bolstering levels of sRAGE pharmacologically may impart benefit in human subjects? Indeed, administration of sRAGE to mice and rats predisposed to exaggerated neointimal expansion significantly limited atherosclerosis and restenosis in these species. The importance of the work of Falcone and colleagues is that it takes the next steps in building the bridge from rodent to human in the biology of RAGE. The particular stepping stone shaped by these authors may set the stage for critical studies to address the question: sRAGE, biomarker or endogenous therapy? However it turns out, valuable insights into RAGE as cause or effector bothstand to be uncovered.
| Acknowledgments |
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| References |
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2. Hofmann MA, Drury S, Fu C, Qu W, Taguchi A, Lu Y, Avila C, Kambham N, Bierhaus A, Nawroth P, Neurath MF, Slattery T, Beach D, McClary J, Nagashima M, Morser J, Stern D, Schmidt AM. RAGE mediates a novel proinflammatory axis: a central cell surface receptor for S100/calgranulin polypeptides. Cell. 1999; 97: 889901.[CrossRef][Medline] [Order article via Infotrieve]
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4. Yan SD, Chen X, Fu J, Chen M, Zhu H, Roher A, Slattery T, Nagashima M, Morser J, Migheli A, Nawroth P, Godman G, Stern D, Schmidt AM. RAGE and amyloid-ß peptide neurotoxicity in Alzheimers disease. Nature. 1996; 382: 685691.[CrossRef][Medline] [Order article via Infotrieve]
5. Chavakis T, Bierhaus A, Al-Fakhri N, Schneider D, Witte S, Linn T, Nagashima M, Morser J, Arnold B, Preissner KT, Nawroth PP. The pattern recognition receptor (RAGE) is a counterreceptor for leukocyte integrins: a novel pathway for inflammatory cell recruitment. J Exp Med. 2003; 198: 15071515.
6. Park L, Raman KG, Lee KJ, Yan L, Ferran LJ, Chow WS, Stern D, Schmidt AM. Suppression of accelerated diabetic atherosclerosis by soluble receptor for AGE (sRAGE). Nat Med. 1998; 4: 10251031.[CrossRef][Medline] [Order article via Infotrieve]
7. Bucciarelli LG, Wendt T, Qu W, Lu Y, Lalla E, Rong LL, Goova MT, Moser B, Kislinger TK, Lee DC, Kashyap Y, Stern DM, Schmidt AM. RAGE blockade stabilizes established atherosclerosis in diabetic apolipoprotein E null mice. Circulation. 2002; 106: 28272835.
8. Kislinger T, Tanji N, Wendt T, Qu W, Lu Y, Ferran LJ, Jr., Taguchi A, Olson K, Bucciarelli L, Goova M, Hofmann MA, Cataldegirmen G, DAgati V, Pischetsrieder M, Stern DM, Schmidt AM. RAGE mediates inflammation and enhanced expression of tissue factor in the vasculature of diabetic apolipoprotein E null mice. Arterioscler Thromb Vasc Biol. 2001; 21: 905910.
9. Zhou Z, Wang K, Penn MS, Marso SP, Lauer MA, Forudi F, Zhou X, Qu W, Lu Y, Stern DM, Schmidt AM, Lincoff AM, Topol EJ. Receptor for AGE (RAGE) mediates neointimal formation in response to arterial injury. Circulation. 2003; 107: 22382243.
10. Sakaguchi T, Yan SF, Yan SD, Rong LL, Sousa M, Belov D, Andrassy M, Marso SP, Duda S, Arnold B, Liliensiek B, Nawroth PP, Stern DM, Schmidt AM, Naka Y. Arterial restenosis: central role of RAGE-dependent neointimal expansion. J Clin Invest. 2003; 111: 959972.[CrossRef][Medline] [Order article via Infotrieve]
11. Cipollone F, Iezzi A, Fazia M, Zucchelli M, Pini B, Cuccurullo C, De Cesare D, De Blasis G, Muraro R, Bei R, Chiarelli F, Schmidt AM, Cuccurullo F, Mezzetti A. The receptor RAGE as a progression factor amplifying arachidonate-dependent inflammatory and proteolytic response in human atherosclerotic plaques: role of glycemic control. Circulation. 2003; 108: 10701077.
12. Falcone C, Emanuele E, DAngelo A, Buzzi MP, Belvito C, Cuccia M, Geroldi D. Plasma levels of soluble receptor for advanced glycation end products and coronary artery disease in nondiabetic men. Arterioscler Thromb Vasc Biol. 2005; 25: 10321037.
13. Yonekura H, Yamamoto Y, Sakurai S, Petrova RG, Abedin MJ, Li H, Yasui K, Takeuchi M, Makita Z, Takasawa S, Okamoto H, Watanabe T, Yamamoto H. Novel splice variants of the receptor for advanced glycation endproducts expressed in human vascular endothelial cells and pericytes, and their putative roles in diabetes-induced vascular injury. Biochem J. 2003; 370: 10971109.[CrossRef][Medline] [Order article via Infotrieve]
14. Schlueter C, Hauke S, Flohr AM, Rogalla P, Bullerdiek J. Tissue specific expression patterns of RAGE receptor and its soluble forms- a result of regulated alternative splicing? Biochim Biophys Acta. 2003; 1630: 16.[Medline] [Order article via Infotrieve]
15. Park IH, Yeon SI, Youn JH, Choi JE, Sasaki N, Choi IH, Shin JS. Expression of a novel secreted splice variant of the receptor for advanced glycation endproducts (RAGE) in human brain astrocytes and peripheral blood mononuclear cells. Mol Immunol. 2004; 40: 12031211.[CrossRef][Medline] [Order article via Infotrieve]
16. Petersson-Fernholm K, Forsblom C, Hudson BI, Periola M, Grant PJ, Groop PH, Finn-Diane Study Group. The functional -374 T/A RAGE gene polymorphism is associated with proteinuria and cardiovascular disease in type 1 diabetic patients. Diabetes. 2003; 52: 891894.
17. Falcone C, Campo I, Emanuele E, Buzzi MP, Zorzetto M, Sbarsi I, Cuccia M. Relationship between the 374 T/A RAGE gene polymorphism and angiographic coronary artery disease. Int J Mol Med. 2004; 14: 10611064.[Medline] [Order article via Infotrieve]
18. Falcone C, Campo I, Emanuele E, Buzzi MP, Geroldi D, Belvito C, Zorzetto M, Sbarsi I, Cuccia M. 374 T/A polymorphism of the RAGE gene promoter in relation to severity of coronary atherosclerosis. Clin Chim Acta. 2005; 354: 111116.[CrossRef][Medline] [Order article via Infotrieve]
19. Hudson BI, Stickland MH, Futers TS, Grant PJ. Study of the 429T/C and 374T/A receptor for advanced glycation end products polymorphisms in diabetic and nondiabetic subjects with macrovascular disease. Diabetes Care. 2001; 24: 2004. Letter.
20. Kirbis J, Milutinovic A, Steblovnik K, Teran N, Terzic R, Zorc M. The 429 T/C and 374 T/A gene polymorphisms of the receptor for advanced glycation endproducts gene (RAGE) are not risk factors for coronary artery disease in Slovene population with type 2 diabetes. Coll Antropol. 2004; 28: 611616.[Medline] [Order article via Infotrieve]
21. Libby P, Ridker PM. Inflammation and atherosclerosis: role of C-reactive protein in risk assessment. Am J Med. 2004; 22: 116 (suppl 6A): 9S16S.[CrossRef]
22. Chen Y, Yan SS, Colgan J, Zhang HP, Luban J, Schmidt AM, Stern D, Herold KC. Blockade of late stages of autoimmune diabetes by inhibition of the receptor for advanced glycation end products. J Immunol. 2004; 173: 13991405.
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