Title : Inhibition of voltage-gated K+ current in rat intrapulmonary arterial myocytes by endothelin-1.

Pub. Date : 1998 May

PMID : 9612301






3 Functional Relationships(s)
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1 Using the whole cell patch-clamp technique in rat intrapulmonary arterial smooth muscle cells, we found that ET-1 and the voltage-dependent K+ (Kv)-channel antagonist 4-aminopyridine, but not the Ca(2+)-activated K(+)-channel antagonist charybdotoxin (ChTX), caused membrane depolarization. Charybdotoxin endothelin 1 Rattus norvegicus
2 Using the whole cell patch-clamp technique in rat intrapulmonary arterial smooth muscle cells, we found that ET-1 and the voltage-dependent K+ (Kv)-channel antagonist 4-aminopyridine, but not the Ca(2+)-activated K(+)-channel antagonist charybdotoxin (ChTX), caused membrane depolarization. Charybdotoxin endothelin 1 Rattus norvegicus
3 In the presence of 100 nM ChTX, ET-1 (10(-10) to 10(-7) M) caused a concentration-dependent inhibition of K+ current (56.2 +/- 3.8% at 10(-7) M) and increased the rate of current inactivation. Charybdotoxin endothelin 1 Rattus norvegicus