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The influence of Fe2+ ions and reduced glutathione (GSH) on the haemolysis of erythrocytes photosensitized (366 nm) by psoralen (PUVA haemolysis) was investigated. PUVA haemolysis was induced by the low fluence rate (24 W m-2) and high fluence (greater than 150 W m-2) of UV-A irradiation. It has been shown that Fe2+ ions and GSH activated PUVA haemolysis at both fluence rates of irradiation. PUVA haemolysis activation by Fe2+ ions was more pronounced than that by GSH. It is supposed that activation caused by Fe2+ ions and GSH is connected with their ability to reduce lipid peroxides or psoralen peroxides with the subsequent formation of free radicals. The regeneration of endogenous Fe2+ by reduced glutathione is also possible.
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