Article

L-arginine supplementation prevents the development of endothelial dysfunction in hyperglycaemia.

Institute of Pharmacology, University of Halle, Faculty of Medicine, Halle, Germany.
Pharmacology (Impact Factor: 1.58). 01/2006; 76(4):185-91. DOI: 10.1159/000091606
Source: PubMed

ABSTRACT Diabetes mellitus leads to the development of endothelial dysfunction which finally contributes to diabetic angiopathy. We investigated the effects of hyperglycaemia on nitric oxide (NO) liberation and a possible influence of L-arginine supplementation. Porcine endothelial aortic cells (PAEC) were cultured in Medium 199 containing 0.33 mmol/l L-arginine. During the entire third culture passage (= 4 days) cells were either exposed to 5 or 20 mmol/l D-glucose with or without additional 3 mmol/l L-arginine. For osmotic control, cells were exposed to 15 mmol/l mannitol. NO liberation was measured under basal conditions and after stimulation with 1 mmol/l ATP using the spectrophotometrical methemoglobin assay. Cells released 35 +/- 8 pmol NO/1 x 10(6) cells/10 min under basal conditions while hyperglycaemia led to a significant reduction in NO release to 16 +/- 6 pmol/1 x 10(6) cells/10 min. In osmotic control, NO release was unchanged (37 +/- 10 pmol/1 x 10(6) cells/10 min). Stimulation with 1 mmol/l ATP led to a significant increase in NO release to 103 +/- 11 pmol/1 x 10(6) cells/10 min (normoglycaemia) which was unchanged in osmotic controls. Under normoglycaemic conditions, additional L-arginine supplementation did not influence NO release from PAEC. In hyperglycaemia (0.33 mmol/l L-arginine) ATP stimulated NO release was reduced (48 +/- 8 pmol/1 x 10(6) cells/10 min, p < 0.05), which was completely prevented by 3 mmol/l L-arginine treatment (98 +/- 15 pmol/ 1 x 10(6) cells/10 min). Hyperglycaemia (but not enhanced osmotic pressure) leads to endothelial dysfunction with reduced NO release which is completely prevented by L-arginine. L-Arginine utilisation may be impaired in hyperglycaemia and L-arginine supplementation might be an interesting additional therapeutic tool in diabetic patients.

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