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Isolation and characterization of a monoclonal antibody specific for epithelial cells

Isolation and characterization of a monoclonal antibody specific for epithelial cells

Cancer Research 45(2): 783-790

Monoclonal antibodies were generated to antigens on human foreskin keratinocytes to identify epithelial-specific molecules. Spleen cells from BALB/c mice, immunized with membrane preparations from primary explants of foreskin epithelial cells, were fused with the NS-1 mouse myeloma line. Hybridoma supernatants were screened for the desired immunological reactivity using enzyme-linked immunosorbant binding assays. Hybridomas secreting antibodies reacting with epithelial cells, but not fibroblasts or lymphocytes, were cloned by limiting dilution and 2 stable clones producing immunoglobulin MK antibodies were selected for study. Evaluation of fixed paraffin-embedded human tissue by an indirect immunoperoxidase technique revealed that the antibodies bound most strongly to normal stratified squamous and transitional epithelium, squamous and transitional cell carcinomas. Antibodies from the cloned hybridomas also reacted with primary cell cultures of foreskin keratinocytes, pulmonary epithelium, fetal liver and amnion cells, but not with primary cultures of nonepithelial cells. Further testing by enzyme-linked immunosorbent assays revealed that the antibodies reacted with some long-term cell lines derived from epithelial tumors. Nonepithelial cell lines were not stained by the antibodies. Indirect immunofluorescent studies indicated that staining was confined to the cell surface. These antibodies may prove useful in studies of differentiation markers of human epithelial cells [and carcinogenesis].

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Accession: 005761331

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PMID: 2578308

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