Insulin-induced peroxynitrite production in human platelet-rich plasma

I. Wittmann, T. Köszegi, L. Wagner, Z. Wagner, I. Mazák, J. Nagy

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Recent data support the possible role of nitric oxide (NO·) in the development of insulin signalling. The aim of this study was to examine the effect of insulin on NO· production by platelets. The chemiluminescence of platelet-rich plasma prepared from the blood of healthy volunteers was measured in the presence of luminol. Indirect detection of NO· by luminol is possible in the form of peroxynitrite produced in the reaction of NO· with a superoxide free radical. Luminol oxidation induced by hydroxyl free radical and lipid peroxidation was prevented by 150 μmol/l of desferrioxamine mesylate. Insulin, in the range of 0.084-840 nmol/l, induced a concentration-dependent increase in chemiluminescence, which was inhibited both by the competitive antagonist of the NO· synthase enzyme, Nω-nitro-L-arginine methyl ester (at concentrations of 2.0-4.0 mmol/l, P <0.001), and by the elimination of superoxide free radicals using superoxide dismutase (72-144 IU/ml, P <0.001). In conclusion, we assume that the insulin-induced increase in chemiluminescence of platelet-rich plasma was due to increased production of NO· and superoxide free radicals forming peroxynitrite. The data are consistent with production of peroxynitrite from human platelets under insulin stimulation.

Original languageEnglish
Pages (from-to)251-255
Number of pages5
JournalRedox Report
Issue number4
Publication statusPublished - Oct 24 2001


ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Clinical Biochemistry
  • Cell Biology
  • Biochemistry, medical

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