Comparison of Endothelium-Related Responses to Nucleotides of Dog and Monkey Cerebral Arteries

• Main Authors: Ayman Geddawy (Author), Takashi Shimosato (Author), Masashi Tawa (Author), Takeshi Imamura (Author), Tomio Okamura (Author)
• Format: Book
• Published: Elsevier, 2010-01-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.

Summary

We compared mechanical responses to uridine-5'triphosphate (UTP) and 2-(methylthio)adenosine-5'diphosphate (2MeSADP) of cerebral arteries isolated from dogs and monkeys. In the dog, UTP induced endothelium-independent contraction, whereas 2MeSADP induced endothelium-dependent relaxation that was abolished by NG-nitro-l-arginine (l-NA). In the monkey, both UTP and 2MeSADP induced endothelium-dependent relaxation.l-NA largely inhibited the UTP-induced relaxation whereas it partially inhibited the 2MeSADP-induced relaxation, and both remaining relaxations were abolished by charybdotoxin plus apamin. In conclusion, dog and monkey cerebral arteries respond differentially to UTP and similarly to 2MeSADP; however, involvement of endothelium-derived relaxing factor in the endothelium-dependent relaxation by 2MeSADP is quite different between the two species. Keywords:: cerebral artery, endothelium-dependent relaxation, nucleotide

Item Description

1347-8613
10.1254/jphs.09316SC