Journal of Applied Physiology
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J Appl Physiol 58: 1761-1766, 1985;
8750-7587/85 $5.00
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Journal of Applied Physiology, Vol 58, Issue 6 1761-1766, Copyright © 1985 by American Physiological Society

ARTICLES

Lung damage and pulmonary uptake of serotonin in intact dogs

C. A. Dawson, C. W. Christensen, D. A. Rickaby, J. H. Linehan and M. R. Johnston

We examined the influence of glass bead embolization and oleic acid, dextran, and imipramine infusion on the pulmonary uptake of trace doses of [3H]serotonin and the extravascular volume accessible to [14C]antipyrine in anesthetized dogs. Embolization and imipramine decreased serotonin uptake by 53 and 61%, respectively, but no change was observed with oleic acid or dextran infusion. The extravascular volume accessible to the antipyrine was reduced by 77% after embolization and increased by 177 and approximately 44% after oleic acid and dextran infusion, respectively. The results suggest that when the perfused endothelial surface is sufficiently reduced, as with embolization, the uptake of trace doses of serotonin will be depressed. In addition, decreases in serotonin uptake in response to imipramine in this study and in response to certain endothelial toxins in other studies suggest that serotonin uptake can reveal certain kinds of changes in endothelial function. However, the lack of a response to oleic acid-induced damage in the present study suggests that serotonin uptake is not sensitive to all forms of endothelial damage.


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