Role of inward K+ channel located at carrot plasma membrane in signal cross-talking of cAMP with Ca2+ cascade.

Abstract:

:Treatment of cultured carrot cells with dibutyryl cAMP or forskolin resulted in the appreciable decrease in extracellular K+ concentration. This decrease was found to be transient and the concentration of the ion in the culture medium restored to the original level within few minutes. The cAMP-induced decrease in K+ level in the medium was almost completely inhibited when carrot cells were incubated in the presence of K+ channel blockers, CsCl and tetraethylammonium chloride. Appreciable amounts of 45Ca2+ were discharged from 45Ca2+-loaded inside-out vesicles of carrot plasma membrane by the stimulation with cAMP, however, the release of the ion was significantly inhibited in the presence of the K+ channel blockers. The release of 45Ca2+ from the vesicles was also observed when K+ current was evoked with an ionophore, valinomycin, even in the absence of cAMP. These results suggest that the gating of some of the inward K+ channels located at plasma membrane of cultured carrot cells is controlled by cytoplasmic concentration of cAMP and the inward K+ current across the plasma membrane induced by the nucleotide elicits Ca2+ influx into the cells possibly by the activation of voltage-dependent Ca2+ channels.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Kurosaki F

doi

10.1016/s0014-5793(97)00403-1

subject

Has Abstract

pub_date

1997-05-12 00:00:00

pages

115-9

issue

1

eissn

0014-5793

issn

1873-3468

pii

S0014-5793(97)00403-1

journal_volume

408

pub_type

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