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

Kensuke Egashira, Hiroaki Shimokawa, Hitonobu Tomoike, Motoomi Nakamura

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)459-461
    Number of pages3
    JournalJAPANESE CIRCULATION JOURNAL
    Volume51
    Issue number4
    DOIs
    Publication statusPublished - 1987

    All Science Journal Classification (ASJC) codes

    • Physiology
    • Cardiology and Cardiovascular Medicine

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