Abstract
The cytokeratins 8, 18, and 19, expressed in many normal and malignant epithelial cells, were purified from human gastrointestinal tumors and used as immunogen for hybridoma generation. The reactivity pattern of five of the generated ten monoclonal antibodies (MAb) was characterized biochemically and immunohistochemically. All of the generated MAb were reactive with the central rod portion of the cytokeratins, as determined after partial enzymatic degradation, and displayed characteristic reactivity patterns. MAb TS 4 exhibits pan-epithelial immunohistochemical reactivity staining of all epithelial structures, including all layers of epidermis and non-keratinizing squamous epithelium and myoepithelial cells. The determinant involved is present on several different cytokeratins, i.e., nos. 1, 5, 7, 8, and 15, as determined by immunoblotting experiments from different tissues and cell lines. MAb TS 1, TS 3, and TS 7 reveal pluri-epithelial reactivity pattern immunohistochemically, similar to TS 4, but they are unreactive with whole epidermis and with superficial cell layers of non-keratinizing squamous cells. MAb TS 1 was found to be highly specific and reactive only with cytokeratin 8. Furthermore, the TS 1 MAb alone can precipi...Continue Reading
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