Search for specific markers of neoplastic epithelial duct and myoepithelial cell lines established from human salivary gland and characterization of their growth in vitro

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Abstract
The neoplastic epithelial duct cells human salivary gland (HSG) and myoepithelial cells human pleomorphic adenoma (HPA) established from human salivary gland were examined by the immunoperoxidase method for the presence of specific antigens such as carcioembryonic antigen (CEA), S-100 protein, secretory component (SC), lactoferrin (LF), and myosin. Isolation of the cells and their morphologic features were reported previously. Consequently, the presence of CEA, SC, and LF in the HSG cells was demonstrated. The HPA cells were identified to express the specific antigens reactive to anti-S-100 protein, anti-myosin and anti-CEA sera in addition to the presence of oxytocin receptor. When the two cell lines were co-cultured in monolayer culture or within the sponge matrix, a large number of ductlike or tubular structures were formed in an optimal ratio of 1:2 in HSG and HPA cells, whereas the cultures of HSG cells only grew with occasional formation of ductlike structure. In addition, in HSG and HPA cells in an area with their contact in the mixed cultures, CEA staining was intensified as compared with the culture of HSG or HPA cells only and further S-100 protein was detected in HSG cells, whereas S-100 protein was not detected in the culture of HSG cells only. These findings strongly suggest that the intercalated duct and myoepithelial cells from human salivary gland propagate with their interaction together in the expression of specific antigens such as CEA and S-100 protein or in the morphogenesis of salivary gland epithelial cells.