Role of peroxynitrite in the protein oxidation and apoptotic DNA fragmentation in vascular smooth muscle cells stimulated with bacterial lipopolysaccharide and interferon-γ

Michael O’Connor, Andrew L. Salzman, Csaba Szabö

    Research output: Contribution to journalArticle

    25 Scopus citations


    In the present study, we investigated the role of endogenous and exogenous peroxynitrite in the process of DNA fragmentation and protein oxidation in cultured rat aortic smooth muscle cells. Peroxynitrite induced DNA fragmentation over a 24 hr period. The effect of peroxynitrite was unaffected by pretreatment with 3-aminobenzamide, an inhibitor of the nuclear enzyme poly (ADP-ribose) synthetase (PARS). Stimulation of the smooth muscle cells with bacterial lipopolysaccharide and interferon-γ produced nitric oxide and peroxynitrite, and resulted in a significant degree of apoptotic DNA fragmentation. The nitric oxide synthase inhibitor NG-methyl-L-arginine (3 mM), but not the PARS inhibitor 3-aminobenzamide (1 mM), reduced the DNA fragmentation. Stimulation with bacterial lipopolysaccharide and interferon-γ also caused a marked oxidation of proteins in the smooth muscle cells, which was inhibited by NG-methyl-L- arginine, as well as by the superoxide dismutase mimetic Mn(lll)tetrakis (4-benzoic acid) porphyrin. Based on these data, we propose a role for peroxynitrite-mediated, PARS-independent pathways in the apoptotic process and in the protein oxidation in bacterial lipopolysaccharide and interferon-γ-stimulated smooth muscle cells.

    Original languageEnglish (US)
    Pages (from-to)439-443
    Number of pages5
    Issue number6
    StatePublished - Dec 1997


    ASJC Scopus subject areas

    • Emergency Medicine
    • Critical Care and Intensive Care Medicine

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