The effects of potassium channel blockers on progesterone-induced suppression of rat portal vein contractility.
The suppression of contractility of rat portal vein caused by progesterone appears to be due to the potassium (K+) channel opening effect of this hormone. The identity of the specific K+ channels involved has been investigated using a variety of K+ channel blockers. Incubation with 100 nM iberiotoxin antagonised the progesterone-induced inhibition of spontaneous and 20 mM K+-induced phasic activity of the portal vein such that the contractions resembled those of the non-progesterone, non-iberiotoxin control tissues treated with the corresponding solvent vehicles. Incubation with barium chloride (20 and 100 microM), 4-aminopyridine (1 mM), tetraethylammonium chloride (1 mM), glibenclamide (1 microM) or apamin (1 microM) did not, however, have the same antagonistic effect. These results suggest that progesterone's selective suppression of rat portal vein contractility is mediated by the opening of BKCa channels.
Mukerji
M S
MS
Department of Nursing Studies, St. Martin's College, Lancaster, UK.
Leathard
H L
HL
Huddart
H
H
D015761:4-Aminopyridine / Q000494:pharmacology; D000818:Animals; D017609:Barium Compounds / Q000494:pharmacology; D002712:Chlorides / Q000494:pharmacology; D005905:Glyburide / Q000494:pharmacology; D007004:Hypoglycemic Agents / Q000494:pharmacology; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009131:Muscle, Smooth, Vascular / Q000187:drug effects*; D010455:Peptides / Q000494:pharmacology; D011169:Portal Vein; D026902:Potassium Channel Blockers; D011374:Progesterone / Q000037:antagonists & inhibitors*; D051381:Rats; D017208:Rats, Wistar
D017609:Barium Compounds; D002712:Chlorides; D007004:Hypoglycemic Agents; D010455:Peptides; D026902:Potassium Channel Blockers; C024986:barium chloride; D011374:Progesterone; C064719:iberiotoxin; D015761:4-Aminopyridine; D005905:Glyburide