Prostanoids, Coronary Circulation and Coronary Artery Spasm in Open Chest Dogs and Miniature Pigs

Kensuke Egashira, Hiroaki Shimokawa, Hitonobu Tomoike, Motoomi Nakamura

    研究成果: Contribution to journalArticle査読

    5 被引用数 (Scopus)


    Effects of prostanoids on coronary circulation were studied in anesthetized open chest dogs with intact coronary arteries or in closed chest Gottingen miniature pigs with denuded vessels. In the latter model, coronary artery spasm was repeatedly provoked at the previously denuded area by histamine i.c. after pretreatment with cimetidine i.v. H2-blocker. In the canine model, prostacyclin (PGI2) dilated to a greater extent the diameter of the large epicardial coronary artery than did PGE2, and both equally reduced the total coronary resistance. Vasoconstrictive effects of carbocyclic thromboxane A2, a stable analogue of thromboxane A2 (TxA2) on the epicardial coronary artery was augmented from 1.1±0.3 to 6.5±1.3% (p<0.01) after pretreatment with cyclooxygenase inhibitors. In case of Göttingen miniature pigs 3 months after endothelial denudation and cholesterol freeding, neither PGI2 nor indomethacin prevented histamine-induced coronary artery spasm. Thiothromboxane A2, a stable analogue of TxA2, did not provoke coronary artery spasm in the animals. Therefore, prostanoids may not be crucial to the provocation or prevention of coronary artery spasm from which myocardial ischemia ensues.

    出版ステータス出版済み - 1987

    All Science Journal Classification (ASJC) codes

    • Physiology
    • Cardiology and Cardiovascular Medicine

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