Tissue and subcellular distribution of CLIC1.

Tissue and subcellular distribution of CLIC1. Research Abstract Details 

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Tissue and subcellular distribution of CLIC1. Abstract Text:

Barbara Ulmasov,Jonathan Bruno,Philip G Woost,John C Edwards,

BACKGROUND: CLIC1 is a chloride channel whose cellular role remains uncertain. The distribution of CLIC1 in normal tissues is largely unknown and conflicting data have been reported regarding the cellular membrane fraction in which CLIC1 resides. RESULTS: New antisera to CLIC1 were generated and were found to be sensitive and specific for detecting this protein. These antisera were used to investigate the distribution of CLIC1 in mouse tissue sections and three cultured cell lines. We find CLIC1 is expressed in the apical domains of several simple columnar epithelia including glandular stomach, small intestine, colon, bile ducts, pancreatic ducts, airway, and the tail of the epididymis, in addition to the previously reported renal proximal tubule. CLIC1 is expressed in a non-polarized distribution in the basal epithelial cell layer of the stratified squamous epithelium of the upper gastrointesitinal tract and the basal cells of the epididymis, and is present diffusely in skeletal muscle. Distribution of CLIC1 was examined in Panc1 cells, a relatively undifferentiated, non-polarized human cell line derived from pancreatic cancer, and T84 cells, a human colon cancer cell line which can form a polarized epithelium that is capable of regulated chloride transport. Digitonin extraction was used to distinguish membrane-inserted CLIC1 from the soluble cytoplasmic form of the protein. We find that digitonin-resistant CLIC1 is primarily present in the plasma membrane of Panc1 cells. In T84 cells, we find digitonin-resistant CLIC1 is present in an intracellular compartment which is concentrated immediately below the apical plasma membrane and the extent of apical polarization is enhanced with forskolin, which activates transepithelial chloride transport and apical membrane traffic in these cells. The sub-apical CLIC1 compartment was further characterized in a well-differentiated mouse renal proximal tubule cell line. The distribution of CLIC1 was found to overlap that of megalin and the sodium-phosphate cotransporter, NaPi-II, which are markers of the apical endocytic/recycling compartment in proximal tubule. CONCLUSION: The cell and tissue specific patterns of CLIC1 expression suggest it may play distinct roles in different cell types. In certain polarized columnar epithelia, it may play a role in apical membrane recycling.

Tissue and subcellular distribution of CLIC1. Publishing Authors By Initials

B Ulmasov,J Bruno,PG Woost,JC Edwards,

For similar biochemical phenomena, metabolism, and nutrition: metabolism: pharmacokinetics: tissue distribution research abstracts see: biochemical phenomena, metabolism, and nutrition: metabolism: pharmacokinetics: tissue distribution research

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Tissue and subcellular distribution of CLIC1. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: BMC cell biology

VOLUME: 8

Page Numbers: 8

Journal Abbreviation: BMC Cell Biol.

ISSN: 1471-2121

DAY: 27

MONTH: 02

YEAR: 2007

Tissue and subcellular distribution of CLIC1. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 100966972

Tissue and subcellular distribution of CLIC1. Keywords Mesh Terms:

KEYWORDS: Tissue Distribution

MESH TERMS: metabolism

Chemical & Substance for Abstract: Tissue and subcellular distribution of CLIC1. Information

Substance Name: Chloride Channels

Registry Number: 0

Grant and Affiliation Information for Tissue and subcellular distribution of CLIC1.

AFFILIATION: Department of Internal Medicine, St. Louis University, St. Louis MO, USA. bulmasov@slu.edu <bulmasov@slu.edu>

Country: England

AGENCY: United States NIDDK

GRANT: R01 DK060551

ACRONYM: DK

MEDLINETA: BMC Cell Biol

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