[Pulmonary surfactant status in experimental dust-induced bronchitis based on the data from dynamic interphase tensiometry].

The disease was simulated by inhalation of dust containing 29% of free silica in Wistar male rats during 8 months. One group of the subjects was kept under 26-28 degrees C and other one--under 38-40 degrees C. Dynamic surface tension of lung tissue homogenate was studied by means of computer tensiometer MRT (Lauda, Germany). Interphase tensiometry precisely characterizes state of lung surfactant in experimental chronic dust bronchitis. Equilibrium surface tension and surface tension for 0.01 and 1 sec deteriorate during combined exposure to silica dust and heating microclimate. The studies demonstrated strong correlation between interphase tensiogram parameters and individual lipids content of lung surfactant. Surface tension is related to the state of lipids peroxidation in lungs and antioxidant systems.