FUNCTIONAL STATUS OF PROOXIDANT AND ANTIOXIDANT SYSTEMS IN THE LUNGS UNDER EXPERIMENTAL ALLERGIC ALVEOLITIS AND STRESS

Abstract

We have analysed the results of the study of alterations in indices of pro-oxidant (conjugated diene and malondialdehyde) and antioxidant (superoxide dismutase, ceruloplasmin, catalase) systems in guinea pigs’lungs in experimental allergic alveolitis in the dynamics of EAA development under the conditions of immobilization stress. The study included 62 female guinea pigs weighing 180-220 g, divided into 4 groups: 1 – intact guinea pigs (n=20); 2 – guinea pigs (n=14) with EAA under conditions of IS (1st day); 3 – guinea pigs (n=14) with EAA under conditions of IS (2nd day); 4 – guinea pigs (n=14) with EAA under conditions of IS (34th day). The results of the experimental study showed that a signifi cant increase in conjugated diene level in animal lungs was observed at all stages of EAA development under conditions of immobilization stress as compared to a control group, indicating the activation of this marker. The same changes occurred with MDA content, indicating excessive accumulation of this lipid peroxidation product in lung tissue. Intensive synthesis of free radical compounds caused activation of some components of the enzymatic system of antioxidant defence. In particular, a moderate decrease in superoxide dismutase activity in lung tissue is observed in response to an increased level of LOPs at early stages of EAA and immobilization stress development as compared to these indices in intact animals. The same situation is observed with catalase and ceruloplasmin activity in the lungs of guinea pigs with modelled AA and IS.

Keywords

• experimental allergic alveolitis, immobilization stress, peroxide lipid oxidation, anti- oxidant system