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Am J Physiol Lung Cell Mol Physiol (January 24, 2003). doi:10.1152/ajplung.00402.2002
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Submitted on November 25, 2002
Accepted on January 15, 2003

What leads to different mediators of alkalosis-induced vasodilation in isolated and in-situ pulmonary vessels?

John B. Gordon1*, Michele A. VanderHeyden1, Ted R. Halla1, Edmundo P. Cortez1, Guillermo Hernandez1, Steven T. Haworth2, Christopher A. Dawson2, and Jane A. Madden3

1 Department of Pediatrics, Medical College of Wisconsin and Zablocki Veterans Administration Medical Center, Milwaukee, WI, USA
2 Department of Physiology, Medical College of Wisconsin and Zablocki Veterans Administration Medical Center, Milwaukee, WI, USA
3 Department of Neurology, Medical College of Wisconsin and Zablocki Veterans Administration Medical Center, Milwaukee, WI, USA

* To whom correspondence should be addressed. E-mail: jgordon{at}mcw.edu.

We previously found that nitric oxide synthase (NOS) inhibition fully blocked alkalosis-induced relaxation of piglet pulmonary artery and vein rings. In contrast, NOS inhibition alone had no effect on alkalosis-induced pulmonary vasodilation in isolated piglet lungs. This study sought to identify factors contributing to the discordance between isolated and in-situ pulmonary vessels. The role of pressor stimulus (hypoxia vs the thromboxane mimetic, U46619), perfusate composition (blood vs physiological salt solution), and flow were assessed. Effects of NOS inhibition on alkalosis-induced dilation were also directly compared in 150 - 350 µm diameter cannulated arteries and 150 - 900 µm diameter, angiographically visualized, in-situ arteries. Finally, effects of NOS inhibition on alkalosis-induced vasodilation were measured in intact piglets. NOS inhibition with N{omega}-nitro-L-arginine (LNA) fully abolished alkalosis-induced vasodilation in all cannulated arteries, but failed to alter alkalosis-induced vasodilation in intact lungs. The results indicate that investigation of other factors such as perivascular tissue (e.g. adventitia and parenchyma) and remote signaling pathways will need to be carried out to reconcile this discordance between isolated and in-situ arteries.




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