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J Appl Physiol 65: 1710-1715, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 65, Issue 4 1710-1715, Copyright © 1988 by American Physiological Society

ARTICLES

Inhibition by colchicine of phospholipid secretion induced by lung distension

A. J. Corbet, R. M. Voelker, F. M. Murphy and M. L. Owens
Department of Pediatrics, Baylor College of Medicine, Houston, Texas 77030.

The effect of colchicine, a microtubule disruptor, on phospholipid secretion stimulated by distension of fetal rabbit lungs was investigated. After colchicine injection and breathing for 45 min, pups were killed and their lungs were lavaged with colchicine. Controls were injected and lavaged with saline. All lungs were given static air inflation and a final lavage, and the returns were analyzed for phospholipid DNA, and lactate dehydrogenase. The first lavage after breathing yielded 33% less phospholipid with colchicine, 3.83 compared with 5.72 mg/g dry lung wt (P less than 0.05). The postinflation phospholipid yield was also significantly reduced with colchicine from 1.04 to 0.70 mg/g dry lung wt (P less than 0.05). The postinflation DNA was significantly reduced with colchicine, from 1.26 to 0.44 micrograms (P less than 0.01), suggesting reduced alveolar macrophages. Colchicine did not change the recovery by lavage of exogenous radioactive phospholipid. As reflected by ATP and lactate levels, tissue metabolism was well maintained. The results are interpreted to mean that colchicine reduced simultaneously lavage-associated phospholipid secretion, inflation-produced phospholipid secretion, and macrophage migration.


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