Reactions and reactivity of myeloperoxidase-derived oxidants: differential biological effects of hypochlorous and hypothiocyanous acids
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Reactions and reactivity of myeloperoxidase-derived oxidants : differential biological effects of hypochlorous and hypothiocyanous acids. / Pattison, David I; Davies, Michael Jonathan; Hawkins, Clare Louise.
In: Free Radical Research, Vol. 46, No. 8, 08.2012, p. 975-95.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Reactions and reactivity of myeloperoxidase-derived oxidants
T2 - differential biological effects of hypochlorous and hypothiocyanous acids
AU - Pattison, David I
AU - Davies, Michael Jonathan
AU - Hawkins, Clare Louise
PY - 2012/8
Y1 - 2012/8
N2 - Myeloperoxidase (MPO) is recognised to play important roles both in the immune system and during the development of numerous human pathologies. MPO is released by activated neutrophils, monocytes and some tissue macrophages, where it catalyses the conversion of hydrogen peroxide to hypohalous acids (HOX; X = Cl, Br, SCN) in the presence of halide and pseudo-halide ions. The major reactive species produced by MPO under physiological conditions are hypochlorous acid (HOCl) and hypothiocyanous acid (HOSCN), with the ratio of these oxidants critically dependent on the concentration of thiocyanate ions (SCN⁻). The reactivity and selectivity of HOCl and HOSCN for biological targets are markedly different, indicating that SCN⁻ ions have the potential to modulate both the extent and nature of oxidative damage in vivo. This article reviews recent developments in our understanding of the role of SCN⁻ in modulating the formation of MPO-derived oxidants, particularly in respect to the differences in reaction kinetics and targets of HOCl compared to HOSCN and the ability of these two oxidants to induce damage in biological systems.
AB - Myeloperoxidase (MPO) is recognised to play important roles both in the immune system and during the development of numerous human pathologies. MPO is released by activated neutrophils, monocytes and some tissue macrophages, where it catalyses the conversion of hydrogen peroxide to hypohalous acids (HOX; X = Cl, Br, SCN) in the presence of halide and pseudo-halide ions. The major reactive species produced by MPO under physiological conditions are hypochlorous acid (HOCl) and hypothiocyanous acid (HOSCN), with the ratio of these oxidants critically dependent on the concentration of thiocyanate ions (SCN⁻). The reactivity and selectivity of HOCl and HOSCN for biological targets are markedly different, indicating that SCN⁻ ions have the potential to modulate both the extent and nature of oxidative damage in vivo. This article reviews recent developments in our understanding of the role of SCN⁻ in modulating the formation of MPO-derived oxidants, particularly in respect to the differences in reaction kinetics and targets of HOCl compared to HOSCN and the ability of these two oxidants to induce damage in biological systems.
KW - Humans
KW - Hydrogen Peroxide
KW - Hypochlorous Acid
KW - Kinetics
KW - Oxidants
KW - Oxidation-Reduction
KW - Oxidative Stress
KW - Peroxidase
KW - Phagocytes
KW - Sulfhydryl Compounds
KW - Thiocyanates
U2 - 10.3109/10715762.2012.667566
DO - 10.3109/10715762.2012.667566
M3 - Journal article
C2 - 22348603
VL - 46
SP - 975
EP - 995
JO - Free Radical Research
JF - Free Radical Research
SN - 1071-5762
IS - 8
ER -
ID: 128975123