THE PECULIARITIES OF MORPOLOGICAL CHANGES OF RATS’ OVARY AND BIOCHEMICAL STATE UNDER THE DAMAGE WITH DIFFERENT DOSES OF LEAD ACETATE

Abstract

The aim of the study was to study the effect of low and high doses of lead acetate on biochemical parameters and morphological status of rat ovaries in the experiment. Materials and methods: The study was performed on 36 nonlinear female rats weighing 180-210 g, aged 4 months, divided into 3 experimental groups: I - control (C), II - rats, which were given 30 days to drink a solution of lead acetate with at the rate of 0,05 mg / kg of animal weight, group III - rats, which were given for 30 days to drink a solution of lead acetate at the rate of 60 mg/kg of animal weight. Biochemical research methods were included determination of diene conjugate concentration in animals’ blood, concentration of TBA-active products, study of oxidative modification of proteins in blood plasma, determination of superoxide dismutase and catalase activities. Endogenous intoxication was assessed by the definition of medium-mass molecules, the content was expressed in units of extinction. The material for light microscopy investigation from the ovary was performed according to the generally accepted method. Results: Lead acetate causes activation of peroxidation of lipids and proteins in the body of female rats, which is directly dependent on the dose of lead. In response to the activation of free radical oxidation there are changes in the antioxidant system, which depend on the dose of lead acetate: at a dose of 0.05 mg / kg superoxide dismutase and catalase activity increase, at a dose of 60 mg / kg superoxide dismutase and catalase activity. Small doses of lead do not cause endogenous intoxication. Lead acetate causes the development of endogenous intoxication in animals only in large doses: increases the formation of toxic compounds, cell apoptosis, decreased excretory function of the kidneys, which is associated with multiorgan disorders. As a result of the action of lead acetate, morphological changes of the ovaries were observed, which increased with increasing dose of lead acetate. There was a dose-dependent decrease in massometric parameters, the number of follicles and changes in the thickness of the surface structures of the ovary, which is more pronounced at 60 mg/kg. Conclusions: Under the influence of small and large doses of lead acetate on biochemical changes in blood and morphological changes in the ovaries in male rats the oxidative stress is developed. Under the influence of small doses, the changes are adaptive, and under the influence of large doses - damaging.