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Immunocytochemical localization of the cystic fibrosis gene product CFTR.

Authors
Type
Published Article
Journal
Proceedings of the National Academy of Sciences
0027-8424
Publisher
Proceedings of the National Academy of Sciences
Publication Date
Volume
88
Issue
20
Pages
9262–9266
Identifiers
PMID: 1718002
Source
Medline

Abstract

Antisera against two peptides, corresponding to different domains of the cystic fibrosis gene product CFTR, have been raised and extensively characterized. Both antisera recognize CFTR as a 165-kDa polypeptide in Western analysis of cells transfected with CFTR cDNA as well as in epithelial cell lines. The cell and tissue distribution of CFTR has been studied by immunocytochemistry. CFTR is abundant in epithelial cells, including those lining sweat ducts, small pancreatic ducts, and intestinal crypts. Unexpectedly, the level of CFTR in lung epithelia is relatively low, while it is abundant in the epithelia of kidney tubules. The protein appears to be restricted to the apical, rather than basolateral, regions of epithelial cells and at least a proportion is associated with the plasma membrane. The cell and tissue distributions of CFTR are consistent with a function for this protein as a chloride channel or as a regulator of channel activity.

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