Abstract
The nonenzymatic isoprostane pathway of lipid peroxidation of polyunsaturated fatty acids results in formation of products, termed isoprostanes, which have very large positional and stereo isomerism, possess various biological activities, produce adducts with proteins, and thus contribute to pathogeneses of the agedependent diseases. However, it was unclear what mechanism drives this type of lipid autoxidation, and why the products have very large isomerism. We propose a mechanism when perhydroxyl radicals (HO2•) react with polyunsaturated fatty acids in the hydrophobic milieu of membranes. In the membrane HO2• initiates a chain of reactions with formation first H2O2, which undergoes homolytic fission producing two •OH radicals, thus very rapidly abstracting three H atoms from a polyunsaturated fatty acid. As a result, the HO2• molecule is converted to two molecules of water, and the molecule of a polyunsaturated fatty acid loses two double bonds, becomes highly unstable and undergoes peroxidation and random intramolecular re-arrangements causing a very large isomerism of the final products. The extremely high reactivity of •HО2 with polyunsaturated fatty acids is the cause of very subtle and slow accumulation of damages in the membrane and membrane associated proteins, even though the concentration of •HО2 relative to superoxide radical may be very low.
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Abbreviations
- AA:
-
arachidonic acid
- DHA:
-
docosahexaenoic acid
- FLA2 :
-
Ca2+-independent phospholipase A2
- Е2-IsoК and D2-IsoК:
-
isoketals with rings Е2 and D2 correspondingly
- IsoLG:
-
isolevuglandins
- IsoTxA2 and IsoTxB2 :
-
isothromboxanes with ring А2 and В2
- IMM:
-
inner mitochondrial membrane
- IPPOL:
-
isoprostane type lipid peroxidation
- IsoP:
-
isoprostane
- LP:
-
lipid peroxidation
- OMM:
-
outer mitochondrial membrane
- PG:
-
prostaglandin
- PUFA:
-
polyunsaturated fatty acid
- ROS:
-
reactive oxygen species
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Panov, A. Perhydroxyl Radical (HO2•) as Inducer of the Isoprostane Lipid Peroxidation in Mitochondria. Mol Biol 52, 295–305 (2018). https://doi.org/10.1134/S0026893318020097
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DOI: https://doi.org/10.1134/S0026893318020097