Acetylcholine blocks Ca++-induced closure of outward K+ currents in isolated patches of canine atrial myocyte sarcolemma.

Abstract:

:The patch clamp technique applied to canine atrial myocyte sarcolemma, showed that 2 types of K+ channels were differentially affected by Ach. The 2 channel types differed in conductance, responses to [Ca++], and sensitivity to membrane potential. Addition of Ach (10(-9) M to 10(-6) M) to pipette solutions increased outward K+ current through each channel type by a different mechanism. Atropine (10(-5) M) blocked all effects of Ach (10(-7) M). These results suggest that muscarinic receptors were linked to potassium channels without cytoplasmic intermediaries, since membrane patches were cell-free. These responses matched the time course and direction of the intact cell's response to Ach.

authors

Bubien JK,Woods WT Jr

doi

10.1016/0006-291x(87)91519-1

subject

Has Abstract

pub_date

1987-02-13 00:00:00

pages

1039-45

issue

3

eissn

0006-291X

issn

1090-2104

pii

0006-291X(87)91519-1

journal_volume

142

pub_type

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