Differential expression of cell surface antigens of canine keratinocytes defined by monoclonal antibodies.

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Abstract
Nine monoclonal antibodies (MAb) directed against cell surface antigens of canine keratinocytes define distinct keratinocyte subpopulations owing to the differential expression of these antigens during the process of differentiation and depending on the tissue location of the cells. There was distinct antigenic heterogeneity between the different layers of stratified squamous epithelium and between stratified squamous epithelial of different tissue origin. Two MAb reacted only with antigens expressed by esophageal mucosa. Three MAb bound to antigens on keratinocytes of the suprabasilar and granular layers of stratified squamous epithelia, and they crossreacted with the transitional epithelial cells of the urinary tract. Two MAb reacted with antigens only expressed on differentiated cells, superficially located in the stratified squamous epithelium. The use of these MAb as markers for keratinocytes in studies on the characterization and differentiation of keratinocytes, as well as in tumor diagnosis and allograft transplantation, is discussed.

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