Histidine-Bound Dinitrosyl Iron Complexes: Antioxidant and Antiradical Properties

Area of Science:

• Biochemistry
• Free Radical Chemistry
• Oxidative Stress Research

Background:

• Dinitrosyl iron complexes (DNICs) are key nitric oxide derivatives with significant biological activities.
• Antioxidant and antiradical properties of DNICs are of major physiological importance.
• Understanding DNIC interactions with prooxidants under oxidative stress is crucial.

Purpose of the Study:

• To investigate the antioxidant and antiradical activities of DNICs bound to L-carnosine and serum albumin.
• To elucidate the mechanisms by which these DNICs interact with various reactive oxygen and nitrogen species.
• To assess the protective effects of DNICs against oxidative damage in biological systems.

Main Methods:

• Studied DNIC interactions with prooxidants (tert-butyl hydroperoxide, iron ions, Angeli's salt) using L-carnosine and bovine serum albumin as ligands.
• Assessed radical scavenging activity against piperazine radicals and superoxide anion radicals (xanthine/xanthine oxidase system).
• Evaluated the effect on oxoferryl myoglobin and oxidative degradation of coenzymes Q9/Q10 in rat myocardial homogenate.

Main Results:

• Carnosine-bound DNICs effectively reduced piperazine free radicals and reacted with superoxide radicals.
• Carnosine DNICs reduced the oxoferryl form of myoglobin.
• Serum albumin-bound DNICs, though less stable, inhibited oxidative degradation of coenzymes Q9 and Q10.

Conclusions:

• DNICs, particularly those with L-carnosine, exhibit potent antioxidant and antiradical properties.
• Both carnosine and albumin DNICs demonstrate protective effects against oxidative damage, albeit through different mechanisms and stabilities.
• These findings highlight the multifaceted role of DNICs in managing reactive species and mitigating oxidative stress.