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Cardiovascular Research 2003 58(3):689-695; doi:10.1016/S0008-6363(03)00294-3
© 2003 by European Society of Cardiology
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Copyright © 2003, European Society of Cardiology

Increased arterial expression of a glycosylated haptoglobin isoform after balloon dilation

Mirjam B Smeetsa,b, Joost P.G Sluijtera,b, Marjo M.P.C Donnersc, Evelyn Velemaa, Sylvia Heenemanc, Gerard Pasterkampa,b and Dominique P.V de Kleijna,b,*

aExperimental Cardiology Laboratory, University Medical Center, Utrecht, The Netherlands
bInteruniversity Cardiology Institute of the Netherlands, Utrecht, The Netherlands
cDepartment of Pathology, Cardiovascular Research Institute Maastricht, University of Maastricht, Maastricht, The Netherlands

d.dekleijn{at}hli.azu.nl

* Corresponding author. Experimental Cardiology Laboratory, University Medical Center, Heidelberglaan 100 (room G02.523), 3584 CX Utrecht, The Netherlands. Tel.: +31-30-250-7155; fax: +31-30-252-2693.

Objective: Haptoglobin is a novel cell migration factor that is expressed in arteries after sustained flow changes and involved in arterial restructuring. Arterial restructuring is the major determinant of arterial shrinkage after balloon dilation. Although the function of extrahepatic haptoglobin expression is not yet understood, local haptoglobin expression may provide the tissue with functionally different haptoglobin due to post-translational modifications. We hypothesized that haptoglobin expression is increased during arterial restructuring after balloon dilation and compared glycosylation patterns between arterial and liver haptoglobin. Methods: Arterial haptoglobin expression was studied in rabbits at 0, 2, 7, 14 and 28 days after balloon dilation (n = 36) using real-time polymerase chain reaction, Western blotting and in situ hybridization. Two-dimensional gel electrophoresis and lectin affinity blotting were used to identify liver and arterial haptoglobin glycoforms. Results: Arterial haptoglobin mRNA (5.7-fold, P = 0.01) and protein levels (1.4-fold, P = 0.01) were increased after balloon dilation whereas liver haptoglobin expression remained constant. Haptoglobin was expressed in the adventitia of balloon dilated rabbit arteries, which was confirmed in human atherosclerotic arteries. Comparison between liver and arterial haptoglobin demonstrated the expression of artery-specific haptoglobin glycoforms. Conclusions: This study demonstrates that arterial haptoglobin expression is increased early after balloon dilation whereas liver haptoglobin expression does not change. Furthermore, arterial haptoglobin consists of an unique set of glycoforms compared to haptoglobin produced in the liver.

KEYWORDS Angioplasty; Arteries; Remodeling; Restenosis


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