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Lipid intermediates which are generated by ROS have drawn more attention after it was found that lipid peroxidation and lipid-radical cycles are two alternative processes. In biological membranes alpha-tocopherol and cytochrome b5, as known, act synergistically to overcome free radical injury and to form lipid-radical cycles. These cycles activate membrane… (More)
Polyunsaturated fatty acids (PUFA) and alpha-tocopherol (alpha-TOH) are the most oxygen-sensitive constituents of cells. alpha-TOH is a member of the vitamin E family that is considered the most important lipophilic antioxidant in cell membranes. Its importance is emphasized by the involvement of oxidative stress in injury to the central nervous system and… (More)
292 It is known that the respiration rate and ATP synn thesis in the mitochondria isolated from ischemic carr diac tissue is fairly low. Oneeelectron oxygen reduction leads to the generation of superoxide and other reacc tive oxygen species (ROS), which occurs in different parts of the respiratory chain . The events that take place in the mitochondria… (More)
The existence of lipid-radical cycles in membranes as an LPO alternative has been proven. Cytochrome b5 seems to play the key role in the formation of these cycles. The functional role of lipid-radical cycles in cell metabolism, including the positive effect on microsomal and mitochondrial oxidation, is discussed.