Effects of Nitrosyl Iron Complexes with Thiol, Phosphate, and Thiosulfate Ligands on Hemoglobin

• Published in: International journal of molecular sciences Vol. 25; no. 13; p. 7194
• Main Authors: Kosmachevskaya, Olga V, Nasybullina, Elvira I, Pokidova, Olesya V, Sanina, Natalia A, Topunov, Alexey F
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 01.07.2024
• Subjects: Amino acids; Analysis; Animals; Antioxidants; Antioxidants - pharmacology; Blood pressure; Enzymes; Free radicals; Glutathione - metabolism; Heme; Hemoglobin; Hemoglobins - chemistry; Hemoglobins - metabolism; Hypertension; Iron - chemistry; Iron - metabolism; Ischemia; Ligands; Nitric oxide; Nitrogen Oxides - chemistry; Nitrogen Oxides - metabolism; Nitrogen Oxides - pharmacology; nitrosyl iron complexes; Oxidation; Oxidation-Reduction - drug effects; oxidative modification; peroxidation; Phosphates; Phosphates - chemistry; Phosphates - metabolism; Physiology; Proteins; Sulfhydryl Compounds - chemistry; Sulfhydryl Compounds - metabolism; tert-butyl hydroperoxide; Thiols; Thiosulfates - chemistry; Thiosulfates - pharmacology; nitric oxide; tert-butyl hydroperoxide; peroxidation; antioxidant effect; nitrosyl iron complexes; oxidative modification; hemoglobin
• ISSN: 1422-0067; 1661-6596; 1422-0067
• DOI: 10.3390/ijms25137194

Nitrosyl iron complexes are remarkably multifactorial pharmacological agents. These compounds have been proven to be particularly effective in treating cardiovascular and oncological diseases. We evaluated and compared the antioxidant activity of tetranitrosyl iron complexes (TNICs) with thiosulfate ligands and dinitrosyl iron complexes (DNICs) with glutathione (DNIC-GS) or phosphate (DNIC-PO ) ligands in hemoglobin-containing systems. The studied effects included the production of free radical intermediates during hemoglobin (Hb) oxidation by -butyl hydroperoxide, oxidative modification of Hb, and antioxidant properties of nitrosyl iron complexes. Measuring luminol chemiluminescence revealed that the antioxidant effect of TNICs was higher compared to DNIC-PO . DNIC-GS either did not exhibit antioxidant activity or exerted prooxidant effects at certain concentrations, which might have resulted from thiyl radical formation. TNICs and DNIC-PO efficiently protected the Hb heme group from decomposition by organic hydroperoxides. DNIC-GS did not exert any protective effects on the heme group; however, it abolished oxoferrylHb generation. TNICs inhibited the formation of Hb multimeric forms more efficiently than DNICs. Thus, TNICs had more pronounced antioxidant activity than DNICs in Hb-containing systems.