Tissue and subcellular distribution of CLIC1
Barbara Ulmasov1, Jonathan Bruno, Philip G Woost
1Department of Internal Medicine, St. Louis University, St. Louis MO, USA. bulmasov@slu.edu <bulmasov@slu.edu>
BMC Cell Biology
|March 1, 2007
Summary
This study maps the distribution of chloride channel CLIC1 (chloride intracellular channel 1) in mouse tissues and cell lines. CLIC1 is found in specific epithelial domains, suggesting distinct cellular roles, potentially in apical membrane recycling.
Area of Science:
- Cell Biology
- Molecular Biology
- Physiology
Background:
- The cellular role and tissue distribution of chloride channel CLIC1 (chloride intracellular channel 1) remain largely undetermined.
- Conflicting data exist regarding the specific cellular membrane fraction where CLIC1 resides.
Purpose of the Study:
- To investigate the precise tissue and cellular distribution of CLIC1 in mouse models.
- To determine the membrane localization of CLIC1 in both polarized and non-polarized cell lines.
Main Methods:
- Generation of sensitive and specific antisera for CLIC1 detection.
- Immunohistochemical analysis of CLIC1 distribution in mouse tissue sections.
- Digitonin extraction to differentiate membrane-bound from soluble CLIC1 in cultured cell lines (Panc1 and T84).
Main Results:
- CLIC1 is localized to the apical domains of simple columnar epithelia (e.g., stomach, intestine, colon, airway) and renal proximal tubules.
- Non-polarized CLIC1 expression observed in basal epithelial cells and skeletal muscle.
- In polarized T84 cells, CLIC1 localizes to a sub-apical intracellular compartment, enhanced by forskolin, and overlaps with apical endocytic markers in proximal tubule cells.
Conclusions:
- Cell and tissue-specific expression patterns of CLIC1 suggest diverse cellular functions.
- CLIC1 may play a role in apical membrane recycling in specific polarized columnar epithelia.
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