Abstract:
:Vasoconstrictor responses elicited by periarterial electrical nerve stimulation were analyzed pharmacologically in the canine isolated, perfused intermediate auricular artery. Phentolamine (10 microM) significantly inhibited the vasoconstrictor responses to stimulation at 5 Hz and over but not those to stimulation at frequencies below 5 Hz. Additionally administered alpha, beta-methylene ATP (1 microM) abolished the phentolamine-resistant vasoconstrictions at all frequencies used in this study. In contrast, suramin (100 microM) inhibited the vasoconstrictor responses to stimulation at 5 Hz and below but not those to stimulation at frequencies higher than 5 Hz. Phentolamine abolished the suramin-resistant vasoconstriction at all frequencies. Phentolamine and alpha, beta-methylene ATP selectively abolished the vasoconstrictor responses to exogenous noradrenaline and ATP, respectively. These results show that the co-transmission of noradrenaline and ATP exists at sympathetic nerve terminals in the canine intermediate auricular artery, and that purinergic transmission is mainly involved in the vasoconstrictor responses to low-frequency nerve stimulation.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Haniuda K,Nakane T,Chiba Sdoi
10.1016/s0014-2999(97)01121-7subject
Has Abstractpub_date
1997-08-27 00:00:00pages
163-8issue
2-3eissn
0014-2999issn
1879-0712pii
S0014-2999(97)01121-7journal_volume
333pub_type
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