title: Nitrite reduces the effects of HOCl on unsaturated phosphatidylcholines--a MALDI-TOF MS study.
abstract: The concentration of nitrite (NO2-) increases under inflammatory conditions. However, the physiological role of nitrite is so far controversial discussed: it was reported that effects of HOCl (an important inflammation mediator) on phospholipids (PL) may be enhanced but also reduced in the presence of nitrite. In this paper a simple model system was used: unsaturated phosphatidylcholine (PC) vesicles were treated with HOCl in the presence of varying NaNO2 concentrations and the yield of reaction products was determined by MALDI-TOF MS: the extent of chlorohydrin generation was significantly reduced in the presence of NaNO2 because HOCl is consumed by the oxidation of NO2- to NO3-. Similar results were obtained when HOCl was generated by the myeloperoxidase (MPO)/H2O2/Cl- system or the experiments were carried out in the presence of a simple peptide. It is concluded that the transient products of the reaction between HOCl and NO2- do not have a sufficient reactivity to modify PL.
authors.affiliation: Institute of Medical Physics and Biophysics, Faculty of Medicine, University of Leipzig, Härtelstr. 16-18, D-04107 Leipzig, Germany.
authors.forename: Michaela
authors.initials: M
authors.lastname: Fitzl
authors.forename: Rosmarie
authors.initials: R
authors.lastname: Süss
authors.forename: Klaus
authors.initials: K
authors.lastname: Arnold
authors.forename: Jürgen
authors.initials: J
authors.lastname: Schiller
mesh_terms: D055598:Chemical Phenomena; D002627:Chemistry, Physical; D006997:Hypochlorous Acid / Q000737:chemistry*; D015394:Molecular Structure; D009573:Nitrites / Q000737:chemistry*; D010713:Phosphatidylcholines / Q000737:chemistry*; D012680:Sensitivity and Specificity; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods*
chemical_list: D009573:Nitrites; D010713:Phosphatidylcholines; D006997:Hypochlorous Acid