Summary
Expression of tissue factor (TF), the cellular receptor of clotting factor VII/VIIa, is a feature of certain malignant tumours. The TF gene has been classified as an immediate early gene responsive to serum and cytokines. Thus, the regulation of TF gene expression seems to play a role in cell growth. Recently, we have shown that constitutive TF expression in MCF-7 breast cancer cells is modulated by such growth factors as EGF, TGFα, and IL-1. The present study deals with the immunocytochemically detectable cellular distribution of TF in human breast cancer cell lines MCF-7 and MaTu stimulated by EGF and TGFα. In MCF-7 cells growing logarithmically, stimulation led to a significant increase of TF mRNA after 2 h (in situ hybridization, Northern blot) and to maximum TF expression after 6 h (immunohistochemistry). When decorated by monoclonal antibodies, TF protein showed a pronounced localization at ruffled membrane areas, cell edges, and processes of spreading cells after 6 and 20 h. In more flattened cells TF was concentrated in peripheric lamellae and microspikes communicating with neighbouring cells. After epithelial colony pattern had established, TF was predominantly accumulated at the intercellular boundaries. The vary same distribution patterns as seen in MCF-7 cells were true for the stimulated MaTu cell line. The dynamics and cellular distribution patterns of stimulated TF expression support the hypothesis that TF could be of importance for morphogenic events associated with the growth and differentiation of breast cancer cells in culture.
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Müller, M., Flössel, C., Haase, M. et al. Cellular localization of tissue factor in human breast cancer cell lines. Virchows Archiv B Cell Pathol 64, 265–269 (1993). https://doi.org/10.1007/BF02915121
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DOI: https://doi.org/10.1007/BF02915121