The AGE-Breaker ALT-711 Restores High Blood Flow–Dependent Remodeling in Mesenteric Resistance Arteries in a Rat Model of Type 2 Diabetes
- Mohamed L. Freidja,
- Kahena Tarhouni,
- Bertrand Toutain,
- Céline Fassot,
- Laurent Loufrani and
- Daniel Henrion⇓
- Department of Integrated Neurovascular Biology, INSERM U771, Centre National de la Recherche Scientifique UMR 6214, Université d’Angers, Angers, France
- Corresponding author: Daniel Henrion, .
M.L.F. and K.T. contributed equally to this work.
Flow-mediated remodeling of resistance arteries is essential for revascularization in ischemic diseases, but this is impaired in diabetes. We hypothesized that breaking advanced glycation end product (AGE) cross-links could improve remodeling in mesenteric resistance arteries in Zucker diabetic fatty (ZDF) rats compared with lean Zucker (LZ) rats. Arteries, exposed to high (HF) or normal (NF) blood flow after alternate arterial ligation in vivo, were collected after 2 weeks. In LZ rats, HF artery diameter was larger than for NF vessels, but this was not the case in ZDF rats. Endothelium-mediated dilation in ZDF rats, which was lower than in LZ rats, was further decreased in HF arteries. Treatment of rats with the AGE-breaker 4,5-dimethyl-3-phenacylthiazolium chloride (ALT-711) (3 mg/kg/day; 3 weeks) reversed diabetes-induced impairment of HF-dependent remodeling. ALT-711 also improved endothelium nitric oxide–dependent relaxation in mesenteric resistance arteries. Reactive oxygen species reduction restored relaxation in ZDF rats but not in LZ or ALT-711–treated rats. AGEs were reduced in ALT-711–treated ZDF rats compared with ZDF rats. Metalloproteinase activity, necessary for HF-dependent remodeling, was reduced in ZDF rats compared with LZ rats and restored by ALT-711. Thus, targeting AGE cross-links may provide a therapeutic potential for overcoming microvascular complications in ischemic disorders occurring in diabetes.
This article contains Supplementary Data online at http://diabetes.diabetesjournals.org/lookup/suppl/doi:10.2337/db11-0750/-/DC1.
- Received May 31, 2011.
- Accepted February 8, 2012.
- © 2012 by the American Diabetes Association.
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