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Originally published as JHC exPRESS on February 18, 2008.
doi:10.1369/jhc.2008.950592
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Journal of Histochemistry and Cytochemistry
Volume 56 (5): 495-509, 2008
Copyright ©The Histochemical Society, Inc.

Murine mCLCA6 Is an Integral Apical Membrane Protein of Non-goblet Cell Enterocytes and Co-localizes With the Cystic Fibrosis Transmembrane Conductance Regulator

Melanie K. Bothe, Josephine Braun, Lars Mundhenk and Achim D. Gruber

Department of Veterinary Pathology, Faculty of Veterinary Medicine, Freie Universität Berlin, Berlin, Germany

Correspondence to: Achim D. Gruber, Department of Veterinary Pathology, Freie Universität Berlin, Robert-von-Ostertag-Strasse 15, 14163 Berlin, Germany. E-mail: gruber.achim{at}vetmed.fu-berlin.de

The CLCA family of proteins consists of a growing number of structurally and functionally diverse members with distinct expression patterns in different tissues. Several CLCA homologs have been implicated in diseases with secretory dysfunctions in the respiratory and intestinal tracts. Here we present biochemical protein characterization and details on the cellular and subcellular expression pattern of the murine mCLCA6 using specific antibodies directed against the amino- and carboxy-terminal cleavage products of mCLCA6. Computational and biochemical characterizations revealed protein processing and structural elements shared with hCLCA2 including anchorage in the apical cell membrane by a transmembrane domain in the carboxy-terminal subunit. A systematic light- and electron-microscopic immunolocalization found mCLCA6 to be associated with the microvilli of non-goblet cell enterocytes in the murine small and large intestine but in no other tissues. The expression pattern was confirmed by quantitative RT-PCR following laser-capture microdissection of relevant tissues. Confocal laser scanning microscopy colocalized the mCLCA6 protein with the cystic fibrosis transmembrane conductance regulator CFTR at the apical surface of colonic crypt cells. Together with previously published functional data, the results support a direct or indirect role of mCLCA6 in transepithelial anion conductance in the mouse intestine. (J Histochem Cytochem 56:495–509, 2008)

Key Words: calcium-activated chloride channel • mCLCA6 • non-goblet cell enterocytes • mouse • intestine • cystic fibrosis • CFTR • membrane protein


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