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• W1978444841 abstract "Abstract Proteins of contractile and cytoskeletal elements have been studied in bovine lens-forming cells growing in culture as well as in bovine and murine lenses grown in situ by immunofluorescence microscopy using antibodies to the following proteins: actin, myosin, tropomyosin, α-actinin, tubulin, prekeratin, vimentin, and desmin. Lens-forming cells contain actin, myosin, tropomyosin, and α-actinin which in cells grown in culture are enriched in typical cable-like structures, i.e. microfilament bundles. Antibodies to tubulin stain normal, predominantly radial arrays of microtubules. In the epithelioid lens-forming cells of both monolayer cultures grown in vitro and lens tissue grown in situ intermediate-sized filaments of the vimentin type are abundant, whereas filaments containing prekeratin-like proteins (‘cytokeratins’) and desmin filaments have not been found. The absence of cytokeratin proteins observed by immunological methods is supported by gel electrophoretic analyses of cytoskeletal proteins, which show the prominence of vimentin and the absence of detectable amounts of cytokeratins and desmin. This also correlates with electron microscopic observations that typical desmosomes and tonofilament bundles are absent in lens-forming cells, as opposed to a high density of vimentin filaments. Our observations show that the epithelioid lens-forming cells have normal arrays of ( i ) microfilament bundles containing proteins of contractile structures; ( ii ) microtubules; and ( iii ) vimentin filaments, but differ from most true epithelial cells by the absence of cytokeratins, tonofilaments and typical desmosomes. The question of their relationship to other epithelial tissues is discussed in relation to lens differentiation during embryogenesis. We conclude that the lens-forming cells either represent an example of cell differentiation of non-epithelial cells to epithelioid morphology, or represent a special pathway of epithelial differentiation characterized by the absence of cytokeratin filaments and desmosomes. Thus two classes of tissue with epithelia-like morphology can be distinguished: those epithelia which contain desmosomes and cytokeratin filaments and those epithelioid tissues which do not contain these structures but are rich in vimentin filaments (lens cells, germ epithelium of testis, endothelium)." @default.
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• W1978444841 date "1980-06-01" @default.
• W1978444841 modified "2023-09-26" @default.
• W1978444841 title "Identification of the cytoskeletal proteins in lens-forming cells, a special epithelioid cell type" @default.
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• W1978444841 doi "https://doi.org/10.1016/0014-4827(80)90437-1" @default.
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