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Journal of Cell Science, Vol 93, Issue 1 107-122, Copyright © 1989 by Company of Biologists
JOURNAL ARTICLES |
S Citi, H Sabanay, J Kendrick-Jones and B Geiger
MRC Laboratory of Molecular Biology, Cambridge, UK.
Cingulin, a protein component associated with the tight junctions of chicken intestinal epithelium, has been purified to homogeneity by a new procedure and characterized. Purified cingulin is a heat-stable elongated dimer, composed of two polypeptides of Mr 108,000 (cingulin-108), with a Stokes' radius of approximately 15 nm, and a molecular length of 130 nm +/- 32 nm. Monoclonal antibodies were used to determine the tissue distribution and subcellular localization of cingulin in a variety of avian tissues and cultured cells. Indirect immunofluorescence analysis of semi-thin frozen sections demonstrated that cingulin is localized in the junctional complex of various polarized epithelia and in the endothelium, whereas it is essentially absent from mesenchymal and myogenic cells. In permeabilized and fixed cultured chick embryo kidney cells, the antibodies stained solely the regions of contacts between the epithelial cells. Double immunofluorescent labeling of these cells with anti-cingulin and anti-vinculin antibodies showed that cingulin is localized close to the vinculin-rich cytoskeletal belt associated with adherens junctions, but is absent from focal contacts and stress fibers. In cultured kidney cells, actin was detected mainly in stress fibers and in the peripheral junctional regions, where it showed a distribution similar to that of cingulin, suggesting that actin filaments may be part of the submembrane cytoskeleton at the level of the tight junction. Indirect immunoelectron microscopic labeling of ultrathin frozen sections of chicken intestine showed that cingulin is localized along the endofacial surfaces of the tight junction (zonula occludens), and is apparently excluded from the more basal zonula adhaerens, and from the desmosomes.
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