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Insulin therapy may help repair atherosclerotic lesions in diabetic patients
Date:1/9/2012

y insulin is executed through two parallel mechanisms: the initiation of elastin gene expression and the enhancement of tropoelastin secretion.

Importantly, the experimental data suggest that insulin-dependent initiation of the elastin gene transcription occurs after dissociation of the FoxO1 transcription factor from the specific domain identified within the elastin gene promoter. The researchers also demonstrated that insulin may facilitate the transportation of tropoelastin into the secretory endosomes, where it can associate with S-GAL/EBP, the "chaperone" protein that enhances secretion.

"We believe that our discovery of the elastogenic action of insulin allows for better understanding of the pathologic mechanisms in which the lack of insulin, in diabetes type I, or insulin resistance, in diabetes type II, contribute to the development of hypertension and the rapid progression of atherosclerosis," concluded Dr. Hinek.

Dr. Hinek further elaborated on the far-reaching effects these data provide: "Importantly, our newest results indicate that the discovered elastogenic effect of low concentrations (0.5-10 nM) of insulin is not restricted to the arterial smooth muscle cells. Thus, insulin also stimulates formation of elastic fibers by human skin fibroblasts and by myofibroblasts isolated from human hearts. These observations constitute a real novelty in the field of regenerative medicine and endorse 1) local application of small doses of insulin for ameliorating difficult healing of dermal wounds in diabetic patients and 2) systemic administration of insulin in patients after heart infarctions, in hope that insulin-induced elastic fiber deposition may alleviate formation of maladaptive collagenous scars in the myocardium."


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Contact: David Sampson
ajpmedia@elsevier.com
215-239-3171
Elsevier Health Sciences
Source:Eurekalert

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