This antibody stains non-cornifying squamous epithelium, cells in certain ciliated pseudo-stratified epithelia and ductal epithelia of various exocrine glands. In immunoblotting experiments, the antibody recognizes only keratin 4 (59kD) and does not show any cross-reactivity with other cytokeratins or with Vimentin, Desmin, GFAP or Neurofilament.
Cytokeratins are a subfamily of intermediate filament proteins and are characterized by a remarkable biochemical diversity, represented in human epithelial tissues by at least 20 different polypeptides. They range in molecular weight between approximately40 kDa and approximately68 kDa and isoelectric pH between 4. 9-7. 8. The individual human cytokeratins are numbered 1 to 20. The various epithelia in the human body usually express cytokeratins which are not only characteristic of the type of epithelium, but also related to the degree of maturation or differentiation within an epithelium. Cytokeratin subtype expression patterns are used to an increasing extent in the distinction of different types of epithelial malignancies. The cytokeratin antibodies are not only of assistance in the differential diagnosis of tumors using immunohistochemistry on tissue sections, but are also a useful tool in cytopathology and flow cytometric assays.
For Research Use Only. Not for use in diagnostic procedures. Not for resale without express authorization.
Protein Aliases: CK-4; cytokeratin 4; Cytokeratin-4; FLJ31692; K4; keratin 4, type II; Keratin, type II cytoskeletal 4; Keratin-4; Type-II keratin Kb4
Gene Aliases: CK-4; CK4; CYK4; K4; KRT4; WSN1
UniProt ID: (Human) P19013
Entrez Gene ID: (Human) 3851