PŘECHODNÉ PRVKY A VOLNÉ RADIKÁLY

Transitive Elements and Free Radicals

Iron and copper are essential trace elements, which in certain conditions, namely in the ionised form or inlow-molecular complexes, can participate in single electron reactions and catalyse formation of free radicals,including the dangerous hydroxyl radical. Similar behavior have also some other transitive metals. Our overview isaimed on the role of transitive elements in the formation of free radicals and on the mechanisms that organisms haveto prevent it. The highest attendance is given to the metabolism of iron and cooper. Consistent protection againstfree transitive metals (by binding with proteins, by oxidation or sequestration in a special compartment) enablesorganism to use their beneficial and required features without impairment of cell. Knowledge of these mechanismsprovides the means to predict and effectively prevent the brake down of such defend systems in situations of theintravascular hemolysis, hemodialysis, administration of iron, impairments of the iron and copper metabolism,intoxication by oxidising substances etc.

Key words:
transitive metals, copper, iron, free radicals, Fenton’s reaction.