@article{oai:niigata-u.repo.nii.ac.jp:00020750,
 author = {多賀, 紀一郎},
 issue = {9},
 journal = {新潟医学会雑誌, 新潟医学会雑誌},
 month = {Sep},
 note = {It has been well known that carbon dioxide (CO_2) has direct inhibitory effects on vascular smooth muscle and induces vasodilation in patients with CO_2 accumulation. However little information is available how CO_2 and endothelium modify the vascular tone induced by various agonists. Thus, I studied effects of high Pco_2 (pH=6.99, Pco_2=91±1mmHg, n=58) on the contractile responses of endothelium-intact and rubbed rat aorta to phenylephrine, potassium chloride (KCl) and human-porcine endothelin-1 (ET-1). High Pco_2 shifted the response of endothelium-intact preparations to phenylephrine to the right with attenuation of maximal response, whereas the pH matched acidotic solution with normal Pco_2 (pH=6.99, Pco_2=38±0 mmHg) shifted that to phenylephrine to the right without changing maximal contraction. The response of endothelium-intact preparations to KCl and ET-1 was not influenced by high Pco_2 and the pH matched acidotic solution with normal Pco_2. In endothelium-rubbed preparation, both high Pco_2 and the pH matched acidotic solution shifted the response to phenylephrine to the right without altering the maximal contraction. The response to KCl of endothelium-rubbed preparation was attenuated by high Pco2, while that to KCl was not influenced by the pH matched acidotic solution. The response to ET-1 of endothelium-rubbed preparation was not altered by high Pco_2. In the presence of cyclooxygenase inhibitors, indomethacin and aspirin, high Pco_2 attenuated the response of endothelium-intact preparations to KCl. The contractile responses of endothelium-intact and rubbed preparations to ET-1 were not influenced by high Pco_2. The findings suggest that the endothelial modulations of the effect of high Pco_2 on vascular smooth muscle contraction are different depending on the agonists. It appears that cyclooxygenase related eicosanoid(s) may be involved in the effects of high Pco_2 on the responses of endothelium-intact preparations to KCl.},
 pages = {836--843},
 title = {高炭酸ガスのラット大動脈収縮に及ぼす影響 : 血管内皮の役割},
 volume = {106},
 year = {1992}
}