title: Thiolate-based dinitrosyl iron complexes: Decomposition and detection and differentiation from S-nitrosothiols.
abstract: Dinitrosyl iron complexes (DNIC) spontaneously form in aqueous solutions of Fe(II), nitric oxide (NO), and various anions. They exist as an equilibrium between diamagnetic, dimeric (bi-DNIC) and paramagnetic, monomeric (mono-DNIC) forms. Thiolate groups (e.g., on glutathione or protein cysteine residues) are the most biologically relevant anions to coordinate to Fe(II). Low molecular weight DNIC have previously been suggested to be important mediators of NO biology in cells, and emerging literature supports their role in the control of iron-dependent cellular processes. Recently, it was shown that DNIC may be one of the most abundant NO-derived products in cells and may serve as intermediates in the cellular formation of S-nitrosothiols. In this work, we examined the stability of low molecular weight DNIC and investigated issues with their detection in the presence of other NO-dependent metabolites such as S-nitrosothiols. By using spectrophotometric, Electron Paramagnetic Resonance, ozone-based chemiluminesence, and HPLC techniques we established that at neutral pH, bi-DNIC remain stable for hours, whereas excess thiol results in decomposition to form nitrite. NO was also detected during the decomposition, but no S-nitrosothiol formation was observed. Importantly, mercury chloride accelerated the degradation of DNIC; thus, the implications of this finding for the diagnostic use of mercury chloride in the detection of S-nitrosothiols were determined in simple and complex biological systems. We conclude S-nitrosothiol levels may have been substantially overestimated in all methods where mercury chloride has been used.
authors.affiliation: Department of Biophysics and Redox Biology Program, Medical College of Wisconsin, Milwaukee, WI 53226, United States.
authors.forename: Agnes
authors.initials: A
authors.lastname: Keszler
authors.affiliation: Department of Biophysics and Redox Biology Program, Medical College of Wisconsin, Milwaukee, WI 53226, United States.
authors.forename: Anne R
authors.initials: AR
authors.lastname: Diers
authors.affiliation: Department of Biophysics and Redox Biology Program, Medical College of Wisconsin, Milwaukee, WI 53226, United States.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Ding
authors.affiliation: Department of Biophysics and Redox Biology Program, Medical College of Wisconsin, Milwaukee, WI 53226, United States. Electronic address: nhogg@mcw.edu.
authors.forename: Neil
authors.initials: N
authors.lastname: Hogg
mesh_terms: D000818:Animals; D003545:Cysteine / Q000031:analogs & derivatives / Q000737:chemistry / Q000494:pharmacology; D005296:Ferrous Compounds / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism; D005978:Glutathione / Q000032:analysis / Q000737:chemistry; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008070:Lipopolysaccharides / Q000494:pharmacology; D049449:Luminescence; D061986:MCF-7 Cells; D051379:Mice; D009569:Nitric Oxide / Q000032:analysis / Q000378:metabolism; D009573:Nitrites / Q000032:analysis / Q000138:chemical synthesis; D000067996:RAW 264.7 Cells; D026403:S-Nitrosothiols / Q000032:analysis* / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D013096:Spermine / Q000031:analogs & derivatives / Q000494:pharmacology
chemical_list: D005296:Ferrous Compounds; D008070:Lipopolysaccharides; D009573:Nitrites; D026403:S-Nitrosothiols; C091861:spermine nitric oxide complex; D013096:Spermine; D009569:Nitric Oxide; C021315:S-nitrosocysteine; D005978:Glutathione; D003545:Cysteine
keywords: DNIC; NO-dependent chemiluminescence; Nitric oxide; S-nitrosothiols