Effects of low-dose L-arginine on insulin-mediated vasodilatation and insulin sensitivity

T. C. Wascher, W. F. Graier, P. Dittrich, M. A. Hussain, B. Bahadori, S. Wallner, H. Toplak

Research output: Contribution to journalArticle

Abstract

The present study was carded out to evaluate the effect of a low-dose intravenous supplementation of L-arginine on insulin-mediated vasodilatation and insulin sensitivity. The study was performed in healthy subjects (n = 7) and patients with obesity (n = 9) and non-insulin-dependent diabetes mellitus (NIDDM) (n = 9). Insulin-mediated vasodilatation was measured by venous occlusion plethysmography during the insulin suppression test, evaluating insulin sensitivity. Experiments were performed twice in each subject in the presence or absence of a concomitant infusion of L-arginine (0.52 mg kg-1 min-1). L-Arginine restored the impaired insulin-mediated vasodilatation observed in obesity (22.4 ± 4.1%, P < 0.01 vs. without L-arginine) and NIDDM (20.3 ± 3.2%, P < 0.01 vs. without L-arginine). In healthy subjects, no effect on insulin mediated-vasodilatation was observed (24.8 ± 3.1% vs. 21.4 ± 3.1%). Insulin sensitivity was improved significantly (P < 0.001) in all three groups by infusion of L-arginine. No effect of L-arginine was observed on insulin, insulin-like growth factor I (IGF-I), free fatty acids (FFAs) or C-peptide levels during the insulin suppression test. Our data indicate that defective insulin-mediated vasodilatation in obesity and NIDDM can be normalized by intravenous L-arginine. Furthermore, L-arginine improves insulin sensitivity in obese patients and NIDDM patients as well as in healthy subjects, indicating a possible mechanism that is different from the restoration of insulin-mediated vasodilatation.

Original languageEnglish (US)
Pages (from-to)690-695
Number of pages6
JournalEuropean Journal of Clinical Investigation
Volume27
Issue number8
DOIs
StatePublished - 1997

Keywords

  • Endothelial dysfunction
  • Insulin sensitivity
  • Insulin-mediated vasodilatation
  • L-Arginine

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry

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