Insulin stimulates arterial neointima formation in normal rats after balloon injury

Diabetes, Obesity & Metabolism
E FosterAndrew M Kahn

Abstract

Insulin resistance in patients is associated with increased atherosclerosis and arterial restenosis. It is thought that the concomitant hyperinsulinaemia exacerbates vascular disease because resistance to insulin-induced glucose disposal is associated with resistance to certain effects of insulin which inhibit, but with no resistance to other effects which promote, neointimal hyperplasia. We sought to determine the net effect of hyperinsulinaemia on neointimal hyperplasia in normal animals. Rats were infused with or without insulin for 16 days and the carotid artery injured by balloon catheter on day 2. Steady-state serum insulin concentrations were 0.56 +/- 0.04 and 1.25 +/- 0.05 nm for control and hyperinsulinaemic rats respectively (p < 0.01). Systolic blood pressures, weights and serum glucose levels were not affected by hyperinsulinaemia. Fourteen days after injury, the neointima-to-media area ratio was 0.72 +/- 0.07 and 1.39 +/- 0.15 for control and hyperinsulinaemic rats respectively (p < 0.05). Media area was unaffected by hyperinsulinaemia. The effects of hyperinsulinaemia which promote neointimal hyperplasia after balloon injury of rat carotid artery predominate over the effects which inhibit it even in normal animals.

References

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Citations

Dec 31, 2008·EuroIntervention : Journal of EuroPCR in Collaboration with the Working Group on Interventional Cardiology of the European Society of Cardiology·Emanuele MeligaPatrick W Serruys
Dec 3, 2013·Canadian Journal of Physiology and Pharmacology·Simon ChiangAdria Giacca
Sep 19, 2012·Diabetes/metabolism Research and Reviews·A RajwaniS B Wheatcroft
Apr 11, 2009·Arteriosclerosis, Thrombosis, and Vascular Biology·Danna M BreenAdria Giacca
Oct 18, 2007·Current Opinion in Endocrinology, Diabetes, and Obesity

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