STUDY OF COPPER COMPLEXES [Cu(LCF3)2] AND [Cu(Lcur)2]H2O AS RADIOPROTECTIVE COMPOUNDS

One of the first and direct signs of the impact of ionizing radiation (IR) on a cell is the destabilization of chromosomes. Radiation-induced damage to the karyotype is an important indicator both for biological indication of the severity of radiation injuries and for predicting the development of long-term adverse effects of IR. The search for new, effective radioprotective compounds is a priority task of modern radiobiology. In this area, metal-based compounds with high antioxidant activity are of particular interest. The purpose of this work is to determine the possible radioprotective properties of Cu(II) complexes, [Сu(LCF3)2] and [Cu(Lcur)2]H2O, supported by the anions of the β-diketone ligands 1,1,1,5,5,5-hexafluoro-2,4-pentanedione (HLCF3) and 1,7-bis(4-hydroxy-3-methoxyphenyl)-1,6-heptadiene-3,5-dione or curcumin (HLcur). In this research work we determined survival, life expectancy and cytogenetic parameters: mitotic index, chromosome aberrations and % of polyploid cells in the bone marrow cells of the femur (count in 1000 cells in each preparation). Group I included intact animals; Group II consisted of animals exposed to the radioisotope technetium; Group III consisted of animals that were intraperitoneally injected with copper complex [Cu(LCF3)2] at a dose of 50 mg/kg in a volume of 2 mL one hour before the administration of the Tc isotope (“irradiation + copper compound [Cu(LCF3)2]); Group IV included animals that received the compound [Cu(Lcur)2]H2O before irradiation. The groups with the injection of [Cu(LCF3)2] complex had the highest survival. In terms of chromosomal aberrations and number of polyploid cells, as indicators, a significant difference was found in those irradiated compared with the “irradiation + [Cu(LCF3)2]” group (both after 15 and after 30 days), which indicates the radioprotective property of the compound. In terms of the mitotic index, a tendency towards normalization was noted after 15 days and a significant difference between Groups 2 and 3 by the end of the study (after 30 days), which also proves the beneficial effect of this compound. Analysis of survival and changes in cytogenetic parameters multiregression analysis using both complexes confirms the greatest efficiency of the [Cu(LCF3)2] complex with respect to [Cu(Lcur)2]H2O, because when using [Cu(Lcur)2]H2O in Group IV and comparing it with “pure irradiation” only a tendency toward normalization of cytogenetic parameters was observed. Multiregression analysis of cytogenetic parameters also confirmed the highest efficiency of the [Cu(LCF3)2] compound in comparison with [Cu(Lcur)2]H2O. The results of the research indicate the need to continue work in the direction of searching for agents that have a therapeutic effect in radiation injuries.