PMID: 2503523Aug 1, 1989Paper

Adducin: Ca++-dependent association with sites of cell-cell contact

The Journal of Cell Biology
H W KaiserV Bennett

Abstract

Adducin is a protein recently purified from erythrocytes and brain that has properties in in vitro assays suggesting a role in assembly of a spectrin-actin lattice. This report describes the localization of adducin to plasma membranes of a variety of tissues and the discovery that adducin is concentrated at sites of cell-cell contact in the epithelial tissues where it is expressed. Adducin in tissues and cultured cells always was observed in association with spectrin and actin, although spectrin and actin were evident in the absence of adducin. In sections of intestinal epithelial cells spectrin was present on all plasma membrane surfaces while adducin was restricted to the lateral cell borders. Adducin also was not detected in association with actin stress fibers in cultured cells. The presence of adducin at cell-cell contact sites of cultured epithelial cells requires extracellular Ca++ and occurs within 15 min of addition of 0.3 mM Ca++. Redistribution of adducin after addition of extracellular Ca++ is independent of formation of desmosomal and adherens junctions since assembly of adducin at contact sites requires lower concentrations of Ca++ and occurs more rapidly than redistribution of desmoplakin or vinculin. Treatment o...Continue Reading

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