Molecular cloning of the human volume-sensitive chloride conductance regulatory protein, pICln, from ocular ciliary epithelium.

Abstract:

:Chloride channels in the ocular ciliary epithelium are believed to play a key role in aqueous humor formation. We isolated a cDNA clone from a lambda Uni-ZAP cDNA library of human nonpigmented ciliary epithelial (NPE) cells encoding the swelling-induced chloride channel/channel regulator pICln. The human clone contains an open reading frame of 237 amino acids (M(r) 26,293). The deduced human amino-acid sequence shows 90.2% and 92.7% identity with counterparts isolated from rat kidney and the canine kidney epithelial cell line MDCK. Human NPE cell lines exhibited significant levels of pICln transcripts. Complementary perforated-patch, whole-cell patch clamping demonstrated that swelling activates Cl- channels of the NPE cells, as suggested by ruptured-patch measurements. The results document the molecular isolation and identification of a human cDNA clone of a Cl- conductance regulator from ocular cells displaying volume-activated Cl-channels.

authors

Anguita J,Chalfant ML,Civan MM,Coca-Prados M

doi

10.1006/bbrc.1995.1309

subject

Has Abstract

pub_date

1995-03-08 00:00:00

pages

89-95

issue

1

eissn

0006-291X

issn

1090-2104

pii

S0006291X85713095

journal_volume

208

pub_type

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