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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2007;27:655.)
© 2007 American Heart Association, Inc.

Atherosclerosis and Lipoproteins

Association Between Osteopontin and Human Abdominal Aortic Aneurysm

Jonathan Golledge; Juanita Muller; Neil Shephard; Paula Clancy; Linda Smallwood; Corey Moran; Anthony E. Dear; Lyle J. Palmer; Paul E. Norman

From the Vascular Biology Unit (J.G., J.M., P.C., C.M.), School of Medicine, James Cook University, Townsville; the Laboratory for Genetic Epidemiology (N.S., L.J.P.), Western Australian Institute for Medical Research and UWA Centre for Medical Research, University of Western Australia, Perth; the Department of Vascular Surgery (A.E.D.), Monash University, Box Hill Hospital, Box Hill, Melbourne; and the School of Surgery and Pathology (L.S., P.E.N.), University of Western Australia, Fremantle Hospital, Fremantle, Australia.

Correspondence to Professor Jonathan Golledge, Director, The Vascular Biology Unit, School of Medicine, James Cook University, Townsville, Queensland, 4811 Australia. E-mail Jonathan.Golledge{at}jcu.edu.au

Objectives— In vitro and animal studies have implicated osteopontin (OPN) in the pathogenesis of aortic aneurysm. The relationship between serum concentration of OPN and variants of the OPN gene with human abdominal aortic aneurysm (AAA) was investigated.

Methods and Results— OPN genotypes were examined in 4227 subjects in which aortic diameter and clinical risk factors were measured. Serum OPN was measured by ELISA in two cohorts of 665 subjects. The concentration of serum OPN was independently associated with the presence of AAA. Odds ratios (and 95% confidence intervals) for upper compared with lower OPN tertiles in predicting presence of AAA were 2.23 (1.29 to 3.85, P=0.004) for the population cohort and 4.08 (1.67 to 10.00, P=0.002) for the referral cohort after adjusting for other risk factors. In 198 patients with complete follow-up of aortic diameter at 3 years, initial serum OPN predicted AAA growth after adjustment for other risk factors (standardized coefficient 0.24, P=0.001). The concentration of OPN in the aortic wall was greater in patients with small AAAs (30 to 50 mm) than those with aortic occlusive disease alone. There was no association between five single nucleotide polymorphisms or haplotypes of the OPN gene and aortic diameter or AAA expansion.

Conclusions— Serum and tissue concentrations of OPN are associated with human AAA. We found no relationship between variation of the OPN gene and AAA. OPN may be a useful biomarker for AAA presence and growth.

In this study the association of osteopontin (OPN) with human AAA was investigated. Serum OPN concentrations were related to AAA presence and growth; however, 5 polymorphisms in the OPN gene were not associated with AAA. Serum OPN may be a useful biomarker for AAA.

Key Words: abdominal aortic aneurysm • genetic polymorphisms • osteopontin

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Mazen Shaheen and Neal L. Weintraub
Arterioscler. Thromb. Vasc. Biol. 2007 27: 439-441. [Full Text] [PDF]

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