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Departments of Surgery, Anesthesiology, and Physiology, State University of New York Health Science Center, Syracuse, New York, 13210
Received 3 May 1996; accepted in final form 1 November 1996.
Hakim, Tawfic S., Lara Ferrario, Jeffrey C. Freedman, Robert
E. Carlin, and Enrico M. Camporesi. Segmental pulmonary vascular
responses to ATP in rat lungs: role of nitric oxide. J. Appl. Physiol. 82(3): 852-858, 1997.
ATP exhibits vascular pressor and depressor responses in a dose-
and tone-dependent manner. The vascular site of ATP-induced contraction
or dilation has not previously been characterized. Using the vascular
occlusion technique, we investigated the effects of ATP in isolated rat lungs perfused with autologous blood (hematocrit = 20%) and described its action during resting and elevated tone in terms of changes in
resistances of the small and large arteries and veins. During resting
tone, ATP (10
5
M)
purines; adenosine 5
-triphosphate; pulmonary vascular
resistance; thromboxane; segmental resistance; occlusion; hypoxia; endothelium-derived relaxing factor
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