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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2005;25:90.)
© 2005 American Heart Association, Inc.

Vascular Biology

Ceramide-Induced Impairment of Endothelial Function Is Prevented by CuZn Superoxide Dismutase Overexpression

Sean P. Didion; Frank M. Faraci

From the Departments of Internal Medicine (S.P.D., F.M.F.) and Pharmacology (F.M.F.), Cardiovascular Center, The University of Iowa Carver College of Medicine, Iowa City.

Correspondence to Sean P. Didion, PhD, Department of Internal Medicine, 2000 Medical Laboratories, The University of Iowa Carver College of Medicine, Iowa City, IA 52242. E-mail sean-didion{at}uiowa.edu

Objective— Ceramide is an important intracellular second messenger that may also increase superoxide. The goal of this study was to determine whether overexpression of CuZn superoxide dismutase (SOD) protects against ceramide-induced increases in vascular superoxide and endothelial dysfunction.

Methods and Results— Carotid arteries from CuZnSOD-transgenic (CuZnSOD-Tg) and nontransgenic littermates were examined in vitro. Immunohistochemistry confirmed that CuZnSOD protein was greater in carotid artery from CuZnSOD-Tg compared with nontransgenic mice. Ceramide (N-acetyl-D-sphingosine; 1 and 10 µmol/L) produced concentration-dependent impairment (P<0.05) of vasorelaxation in response to the endothelium-dependent agonist acetylcholine (ACh) in nontransgenic mice. For example, 100 µmol/L ACh relaxed arteries from nontransgenic mice by 96±4% and 52±5% in the presence of vehicle and 10 µmol/L ceramide, respectively. In contrast, ceramide (1 or 10 µmol/L) had no effect (P>0.05) on responses of carotid artery to ACh in CuZnSOD-Tg mice. Ceramide had no effect on nitroprusside- or papaverine-induced relaxation in CuZnSOD-Tg or nontransgenic mice. Ceramide increased superoxide in arteries from nontransgenic vessels, and this effect was prevented by polyethyleneglycol-SOD (50 U/mL) or overexpression of CuZnSOD.

Conclusions— These results suggest that ceramide-induced increases in superoxide impair endothelium-dependent relaxation, and that select overexpression of the CuZn isoform of SOD prevents ceramide-induced oxidative stress in vessels.

Ceramide, an important intracellular second messenger, has been found to increase superoxide. The results of the present study indicate that ceramide-induced increases in superoxide impairs endothelium-dependent relaxation and that select overexpression of the CuZn isoform of superoxide dismutase is very effective in preventing ceramide-induced oxidative stress in vessels.

Key Words: carotid artery • genetically altered mice • nitric oxide • reactive oxygen species • SOD1

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