NADPH oxidase 1 plays a key role in diabetes mellitus-accelerated atherosclerosis

Gray, S.P. et al. (2013) NADPH oxidase 1 plays a key role in diabetes mellitus-accelerated atherosclerosis. Circulation, 127(18), pp. 1888-1902. (doi:10.1161/CIRCULATIONAHA.112.132159)

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Abstract

Background—In diabetes mellitus, vascular complications such as atherosclerosis are a major cause of death. The key underlying pathomechanisms are unclear. However, hyperglycemic oxidative stress derived from NADPH oxidase (Nox), the only known dedicated enzyme to generate reactive oxygen species appears to play a role. Here we identify the Nox1 isoform as playing a key and pharmacologically targetable role in the accelerated development of diabetic atherosclerosis.

Methods and Results—Human aortic endothelial cells exposed to hyperglycemic conditions showed increased expression of Nox1, oxidative stress, and proinflammatory markers in a Nox1-siRNA reversible manner. Similarly, the specific Nox inhibitor, GKT137831, prevented oxidative stress in response to hyperglycemia in human aortic endothelial cells. To examine these observations in vivo, we investigated the role of Nox1 on plaque development in apolipoprotein E–deficient mice 10 weeks after induction of diabetes mellitus. Deletion of Nox1, but not Nox4, had a profound antiatherosclerotic effect correlating with reduced reactive oxygen species formation, attenuation of chemokine expression, vascular adhesion of leukocytes, macrophage infiltration, and reduced expression of proinflammatory and profibrotic markers. Similarly, treatment of diabetic apolipoprotein E–deficient mice with GKT137831 attenuated atherosclerosis development.

Conclusions—These studies identify a major pathological role for Nox1 and suggest that Nox1-dependent oxidative stress is a promising target for diabetic vasculopathies, including atherosclerosis.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Montezano, Dr Augusto and Touyz, Professor Rhian
Authors: Gray, S.P., Di Marco, E., Okabe, J., Szyndralewiez, C., Heitz, F., Montezano, A.C., de Haan, J.B., Koulis, C., El-Osta, A., Andrews, K.L., Chin-Dusting, J.P.F., Touyz, R.M., Wingler, K., Cooper, M.E., Schmidt, H.H.H.W., and Jandeleit-Dahm, K.A.
College/School:College of Medical Veterinary and Life Sciences > Institute of Cardiovascular and Medical Sciences
Journal Name:Circulation
Publisher:Lippincott Williams & Wilkins
ISSN:0009-7322
ISSN (Online):1524-4539

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