The AGE cross-link breaker ALT-711 restored LV ejection fraction (which had fallen by 25% due to diabetes), reduced aortic stiffness, and reversed collagen upregulation in aged diabetic dogs.
Does the AGE cross-link breaker phenyl-4,5-dimethylthazolium chloride (ALT-711) improve left ventricular function and reduce myocardial collagen in aging dogs with alloxan-induced diabetes mellitus?
The AGE cross-link breaker ALT-711 improves LV function and reduces myocardial collagen and aortic stiffness in an aging diabetic dog model, suggesting potential therapeutic value for aged diabetic patients.
Aging and diabetes mellitus (DM) both affect the structure and function of the myocardium, resulting in increased collagen in the heart and reduced cardiac function. As part of this process, hyperglycemia is a stimulus for the production of advanced glycation end products (AGEs), which covalently modify proteins and impair cell function. The goals of this study were first to examine the combined effects of aging and DM on hemodynamics and collagen types in the myocardium in 12 dogs, 9-12 yr old, and second to examine the effects of the AGE cross-link breaker phenyl-4,5-dimethylthazolium chloride (ALT-711) on myocardial collagen protein content, aortic stiffness, and left ventricular (LV) function in the aged diabetic heart. The alloxan model of DM was utilized to study the effects of DM on the aging heart. DM induced in the aging heart decreased LV systolic function (LV ejection fraction fell by 25%), increased aortic stiffness, and increased collagen type I and type III protein content. ALT-711 restored LV ejection fraction, reduced aortic stiffness and LV mass with no reduction in blood glucose level (199 +/- 17 mg/dl), and reversed the upregulation of collagen type I and type III. Myocardial LV collagen solubility (%) increased significantly after treatment with ALT-711. These data suggest that an AGE cross-link breaker may have a therapeutic role in aged patients with DM.
Liu et al. (Mon,) conducted a other in Aging and diabetes mellitus (n=12). Phenyl-4,5-dimethylthazolium chloride (ALT-711) vs. Untreated diabetic state was evaluated on Myocardial collagen protein content, aortic stiffness, and left ventricular function. The AGE cross-link breaker ALT-711 restored LV ejection fraction (which had fallen by 25% due to diabetes), reduced aortic stiffness, and reversed collagen upregulation in aged diabetic dogs.