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H+-gradient-dependent active transport of tetraethylammonium cation in apical-membrane vesicles isolated from kidney epithelial cell line LLC-PK1.

Authors
  • Inui, K
  • Saito, H
  • Hori, R
Type
Published Article
Journal
The Biochemical journal
Publication Date
Apr 01, 1985
Volume
227
Issue
1
Pages
199–203
Identifiers
PMID: 2986603
Source
Medline
License
Unknown

Abstract

Transport of [3H]tetraethylammonium (NEt4+), an organic cation, has been studied by using apical-membrane vesicles isolated from cultured kidney epithelial cell line LLC-PK1. The uptake of NEt4+ by apical-membrane vesicles was osmotically sensitive, time-dependent and saturable. The presence of an H+ gradient ([H+]i greater than [H+]o) induced a marked stimulation of NEt4+ uptake against its concentration gradient (overshoot phenomenon), and this concentrative uptake was inhibited by HgCl2. These results suggest that apical membranes isolated from the LLC-PK1 cells retain the transport characteristics of NEt4+ similar to those observed in renal brush-border membranes.

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