Low-conductance chloride channel activated by cAMP in the epithelial cell line T84.

Abstract:

:We have studied the modulation and pharmacological properties of two anion channels in T84 cells by recording single channel and transepithelial currents. One channel had an outwardly rectifying current-voltage I/V curve, was rarely active in cell-attached patches, and was unaffected by cAMP. The other channel had lower conductance (8.7 pS at 37 degrees C) and a more ohmic I/V relationship. Exposure to cAMP increased the probability of observing low-conductance channel activity in cell-attached patches greater than 6-fold. Extracellular DIDS (4,4'-diisothiocyanatostilbene-2,2'-disulfonic acid) or [IAA-94 (an indanyloxyacetic acid) inhibited the outward rectifier but did not affect the low-conductance channel or cAMP-stimulated transepithelial current. These results suggest the low-conductance Cl channel may contribute to apical membrane conductance during cAMP-stimulated secretion.

journal_name

FEBS Lett

journal_title

FEBS letters

authors

Tabcharani JA,Low W,Elie D,Hanrahan JW

doi

10.1016/0014-5793(90)81257-o

subject

Has Abstract

pub_date

1990-09-17 00:00:00

pages

157-64

issue

1-2

eissn

0014-5793

issn

1873-3468

pii

0014-5793(90)81257-O

journal_volume

270

pub_type

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