Abstract:
:Cutaneous arteries show enhanced contraction in response to cooling, which is suggested to be mediated via α2C-adrenoceptors. We have previously shown that α1-adrenoceptors are also involved in the enhanced contraction in cooling conditions. In the present study, we aimed to identify the α1-adrenoceptor subtype involved in the response. Phenylephrine-induced contraction was enhanced by cooling to 24 °C in isolated rat tail arteries but suppressed in iliac arteries and aorta. At 37 °C, RS100329 (3 nM), an α1A-adrenoceptor antagonist, shifted the concentration-response curve of phenylephrine to the right in tail and iliac arteries, but not in aorta, while BMY7378 (10 nM), an α1D-adrenoceptor antagonist, shifted them to the right in aorta and iliac arteries, but not in tail arteries. At 24 °C, RS100329 (3 nM) shifted the concentration-response curve of phenylephrine to the right and decreased the maximum contraction in tail arteries. The inhibitory effects of RS100329 (3 nM) were more pronounced at 24 °C, compared to at 37 °C, implying larger contribution of α1A-adrenoceptors at 24 °C. In tail arteries, the maximum contraction of A-61603, an α1A-adrenoceptor agonist, was larger at 24 °C than at 37 °C. In contrast, in iliac arteries, the maximum contraction of A-61603 was smaller and its EC50 was smaller at 24 °C than at 37 °C. Under the condition where α1D-adrenoceptors were blocked, phenylephrine-induced contraction of iliac arteries was rather enhanced by cooling to 24 °C. These results suggest that α1A-adrenoceptors contribute to the enhanced contraction of cutaneous arteries in cooling conditions.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Ishida H,Saito SY,Ishikawa Tdoi
10.1016/j.ejphar.2018.09.004subject
Has Abstractpub_date
2018-11-05 00:00:00pages
120-128eissn
0014-2999issn
1879-0712pii
S0014-2999(18)30517-Xjournal_volume
838pub_type
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