(PA24) Suppression by Antioxidative Chelators of Toxic Effects of Iron Overload in Rats

Title Suppression by Antioxidative Chelators of Toxic Effects of Iron Overload in Rats
Year 1997
Author I.B. Afanas;ev;  E.A. Ostrachovich; E. Michal’ chik; L.G. Korkina
Publisher 8th International Conference: Oral Chelation in the Treatment of Thalassemia and other Diseases


L.B. Afanas’ev1, E.A. Ostrachovich1, E. Michal’chik2 and L.G. Korkina2

1Vitamin Research Institute, Moscow 117820, Russia
2 Russian Medical University, Moscow, Russia.

Iron overload (IOL) is a well-known origin of human and animal pathologies initiated or mediated by free radicals. To investigate the possibility of the inhibition of iron-initiated damaging processes by antioxidative chelators, we developed the animal models of IOL and studied the IOL effects on lipid peroxidation and oxygen radical production by neutrophils and macrophages. Iron overloading was achieved by feeding rats the diets supplemented with elemental iron for 42 days or infusing the animals interperitioneally with the FeSO4 solution for 3 days IOL resulted in the sharply enhanced levels of TBA-reactive products in liver microsomes and the macrophage plasmalemma and oxygen radical over production by professional phagocytes

(nonstimulated and PMA-stimulated peritoneal macrophages and blood leukocytes). To suppress iron-stimulated free radical processes, we administrated natural nontoxic substances possessing both chelating and antioxidant properties (bioflavonoid rutin, lipoic acid, and Bio-Normalizer, a natural Japanese food supplementation) to IOL rats, rutin and lipoic acid diminished free radical over production without diminishing iron levels in the blood probably due to the formation of iron-rutin or iron-lipoic acid complexes, which were unable to catalyzer free radical reactions. In contrast, Bio-Normalizer sharply decreased both the content of non-heme iron and lipid peroxidation in the plasmalemma of macrophages as well as the macrophage oxygen radical release. On these grounds we assumed that toxic effects of iron overload may be suppressed by antioxidative chelators via (1) scavenging of free radicals, (2) the enhanced excretion of iron, (3) the formation of inactive iron-chelator complexes incapable of catalyzing free radical reactions.

Person to whom correspondence should be addressed

Professor Afanas’ev Igor
Vitamin Research Institute, Nauchny pr. 14A, Moscow 117820, Russia
Tel/Fax 7095-434-7187; E-mail: iafan@dol.ru