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Sodium cholate interactions with rabbit's pulmonary surfactant.

In order to assay the possibility that sodium cholate interacts with pulmonary surfactant, we obtained bronchoalveolar lavage fluid from lungs of adult rabbits and measured the hysteresis area of surface tension-area loops of the bronchoalveolar lavage fluid in a Wilhelmy surface tension balance, before and after the addition of sodium cholate to reach different concentrations. We observed a biphasic behavior: at a low concentration of sodium cholate (1.5 x 10(5) mol/l; n = 6) the hysteresis area increased (p less than 0.05) as compared to its control (initial) area, meanwhile at a higher concentration (5 x 10(-5) mol/l; n = 6) the hysteresis area decreased (p less than 0.025), revealing a likely interaction of sodium cholate with pulmonary surfactant. We conclude that sodium cholate is able to interact in vitro with lung surfactant.