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Elastogenesis Stimulation by Minoxidil or Nebivolol Reduces Premature Aging of the Aortic Wall in Diabetic Mice
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Edité par CCSD -
International audience. Background The approximately fifteen-year reduction in life expectancy observed in diabetic patients, compared to non-diabetic individuals, is believed to be attributed to the early onset of cardiovascular diseases. Among the molecular actors involved in the occurrence of cardiovascular complications, the remodeling of elastic fibers (EFs) in favor of degradation rather than neosynthesis is significant. Objective This study aims to modulate the elastogenesis/elastolysis balance in the arterial wall of diabetic db/db mice (a diabetic model where the leptin receptor is deficient) to limit the premature aging of their EFs and aortic stiffening. Methods Mice are treated with two antihypertensive agents: minoxidil (an ATP-sensitive potassium (KATP) channel opener) or nebivolol (a β-blocker also active on KATP channels). The degree of wear and functionality of EF are assessed after these treatments. We complement this analysis by identifying molecular actors from smooth muscle cell cultures. Results Our data show that by applying these antihypertensive agents in cultured vascular smooth muscle cells in vitro and in diabetic mice, we efficiently stimulate elastogenesis and inhibit elastolysis. Therefore, treatments restore functional EFs and limit their degradation. This brings blood pressure values of diseased mice close to normal ones (as in unaffected mice). Elastogenesis pathway stimulation and elastolysis inhibition are induced by the opening of sensitive KATP channels and the regulation of the forkhead box transcription factor (FOXO1). Conclusion Monitoring these two pathways could, therefore, be sufficient to limit the premature aging of the aorta and to reduce the occurrence of hypertension, atherosclerosis, and aneurysms in diabetic patients.
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