Title : The nitric oxide congener nitrite inhibits myeloperoxidase/H2O2/ Cl- -mediated modification of low density lipoprotein.

Pub. Date : 2001 Jan 19

PMID : 11054430






7 Functional Relationships(s)
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1 The nitric oxide congener nitrite inhibits myeloperoxidase/H2O2/ Cl- -mediated modification of low density lipoprotein. Nitrites myeloperoxidase Homo sapiens
2 Recent studies have shown that myeloperoxidase (MPO), an abundant heme protein released by activated leukocytes, can oxidize nitrite (NO(2-)) to a radical species, most likely nitrogen dioxide. Nitrites myeloperoxidase Homo sapiens
3 Recent studies have shown that myeloperoxidase (MPO), an abundant heme protein released by activated leukocytes, can oxidize nitrite (NO(2-)) to a radical species, most likely nitrogen dioxide. Nitrites myeloperoxidase Homo sapiens
4 Furthermore, hypochlorous acid (HOCl), the major strong oxidant generated by MPO in the presence of physiological concentrations of chloride ions, can also react with nitrite, forming the reactive intermediate nitryl chloride. Nitrites myeloperoxidase Homo sapiens
5 Interestingly, nitrite concentrations as low as 12.5 and 25 microm significantly decreased MPO/H2O2)/Cl- -induced modification of apoB lysine residues, formation of N-chloramines, and increases in the relative electrophoretic mobility of LDL. Nitrites myeloperoxidase Homo sapiens
6 Furthermore, experiments using ascorbate (12.5-200 microm) and the tyrosine analogue 4-hydroxyphenylacetic acid (12.5-200 microm), which are both substrates of MPO, indicated that nitrite inhibits MPO-mediated LDL modifications by trapping the enzyme in its inactive compound II form. Nitrites myeloperoxidase Homo sapiens
7 Furthermore, experiments using ascorbate (12.5-200 microm) and the tyrosine analogue 4-hydroxyphenylacetic acid (12.5-200 microm), which are both substrates of MPO, indicated that nitrite inhibits MPO-mediated LDL modifications by trapping the enzyme in its inactive compound II form. Nitrites myeloperoxidase Homo sapiens