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XB-ART-22815
J Biol Chem 1993 Feb 25;2686:3821-4.
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Molecular cloning of a chloride channel that is regulated by dehydration and expressed predominantly in kidney medulla.

Uchida S , Sasaki S , Furukawa T , Hiraoka M , Imai T , Hirata Y , Marumo F .


Abstract
Complementary DNA encoding a rat kidney chloride channel (CIC-K1) was isolated by a polymerase chain reaction (PCR) cloning strategy. We designed degenerate primers, based on the regions where previously cloned chloride channels (CIC-0, -1, and -2) possess significant amino acid identity, and performed reverse transcription PCR with whole kidney mRNA. The 686-amino acid protein encoded by CIC-K1 is about 40% identical to the previously cloned chloride channels and has a similar hydropathy profile. Expression of CIC-K1 in Xenopus oocytes induced Cl- currents that activate instantaneously upon hyperpolarization and depolarization, and displayed a slightly outwardly rectifying current-voltage relationship. The message for CIC-K1 was 2.4 kilobases and was found predominantly in kidney, especially in the inner medulla. Reverse transcription PCR technique using micro-dissected nephron segments revealed that the main site of expression in kidney was the thin ascending limb of Henle's loop, which has the highest Cl- permeability among the nephron segments and is thought to be involved in a counter-current system for urine concentration in the inner medulla. The abundance of CIC-K1 mRNA in kidney increased about 4-fold as rats became dehydrated by deprivation of water for 5 days. The site of expression and the regulation by dehydration suggest that CIC-K1 function may be important in urinary concentrating mechanisms.

PubMed ID: 7680033
Article link: J Biol Chem


Species referenced: Xenopus
Genes referenced: cic

References :
Uchida, Molecular cloning of a chloride channel that is regulated by dehydration and expressed predominantly in kidney medulla. 1994, Pubmed