Release of TEA blockade of maxi-K+ channels by isoproterenol.

Abstract:

:The outward K+ current induced by step depolarization of freshly dispersed myocytes of guinea-pig taenia coli decreased about 80% upon treatment with 3 mM tetraethylammonium chloride (TEA). Isoproterenol (ISO, 2-5 microM) restored it to a large extent. This restoration did not occur in the presence of propranolol (2 microM). In single-channel recordings from cell-attached patches, the activity of maxi-K+ channel is dominant. When 3 mM TEA is incorporated in the pipette solution, the dominant channel-openings observed had much smaller unitary conductance. On the addition of ISO (2 microM) to the bath solution, but not to the pipette solution, K(+)-channel openings with unitary conductance similar to that without TEA treatment appeared. Cyclic AMP incorporated into the cytoplasm through the pipette was ineffective. These results indicate that ISO release TEA decrease of maxi-K+ channel conductance through some intracellular second messenger system other than adenylyl cyclase-protein kinase A system.

authors

Fan SF,Wang S,Kao CY

doi

10.1006/bbrc.1994.1664

subject

Has Abstract

pub_date

1994-05-30 00:00:00

pages

24-9

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006291X84716640

journal_volume

201

pub_type

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