© 1971 American Heart Association, Inc.
Histamine and interstitial Pulmonary Edema in the Dog
1 Division of Pathologic Anatomy, Department of Pathology and the Cardiovascular-Pulmonary Division, Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104
Histamine, administered to dogs by various routes, produced peribronchial interstitial edema. Using colloidal carbon as an electron-dense tracer, it was shown that bronchial venules had become leaky at the same time that the minute blood vessels of the pulmonary circulation remained unaffected by the histamine. The effect of histamine was rapid and brief in duration: wide interendothelial gaps appeared in the walls of bronchial venules through which blood and tracer escaped into the interstitium. This action of histamine seemed to be related to the presence in the bronchial venular endothelium of abundant cytoplasmic fibrils that presumably have contractile capacity. Water content of the lungs was consistent with morphologic evidence that histamine promoted the accumulation of fluid in the lungs. The same pattern of response was observed after bradykinin or compound 48/80, a mast cell degranulator. In contrast to these three agents, serotonin did not affect bronchial venular permeability to colloidal carbon. Consideration of these observations in the light of the large extent of the bronchial venular plexus, raises the possibility that the bronchial venular system may play an important reabsorptive role under normal circumstances and that it may also be involved in the genesis of certain types of interstitial pulmonary edema.
Key Words: serotonin • bradykinin • 48/80 • permeability • bronchial circulation • endothelial contraction • electron microscopy • colloidal carbon
Submitted on February 4, 1971
Accepted on August 10, 1971
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