Abstract:
:Endothelin (ET)-1 and big ET-1 both caused contraction of isolated porcine coronary arteries, but the potency of big ET-1 was 1/100-1/200 that of ET-1. These responses were independent of the vascular endothelium. Phosphoramidon blocked the vasoconstriction caused by 30 nM big ET-1, but was ineffective on the action of 0.3 nM ET-1. Also in vivo, phosphoramidon had no effect on the ET-1-induced pressor actions, but blocked the pressor and airway-contractile responses to big ET-1 in rats and/or guinea pigs. Thus, it is likely that the vascular responses to exogenous big ET-1 are at least in part due to its conversion to ET-1 by a phosphoramidon-sensitive ET converting enzyme(s) in the vascular smooth muscle in vitro and in vivo.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Fukuroda T,Noguchi K,Tsuchida S,Nishikibe M,Ikemoto F,Okada K,Yano Mdoi
10.1016/0006-291x(90)90685-gsubject
Has Abstractpub_date
1990-10-30 00:00:00pages
390-5issue
2eissn
0006-291Xissn
1090-2104pii
0006-291X(90)90685-Gjournal_volume
172pub_type
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