Effects of the flavonoids on the lead induced tissue damage

Oxidative stress refers to the undue oxidation of biomolecules leading to cellular damage, and it is carried out by reactive oxygen species (ROS). Oxidative damage contributes deleterious effects; it may affect the DNA, which can lead to nucleotide oxidation and dimerization and it may alter structural protein function or change the tertiary structure of enzymes. The ratio between generation and detoxification of ROS requires keeping fixed and there have been several defense systems in metabolism via function different mechanisms for this balance. Nevertheless, endogenous and exogenous triggers may cause the overproduction of ROS or the impairment of these antioxidant defense systems, therefore leading to oxidative stress.In this study, the roles of flavonoids, the delay of destruction and the removal of oxidative stress which will take place in the rats liver with the toxicity of Pb were investigated. In these inactivation mechanisms, superoxide dismutase, catalase, glutahtione peroxidase enzyme activities alterations which have antioxidative effects via removing of deleterious effects of free radicals and lipid peroxidation levels were determined.