Summary
A recently discovered human plasma protein, tetrancetin (TN), which has previously been demonstrated immunohistochemically within various endocrine tissues, was in this study identified in an additional number of epithelial and mesenchymal cells by two polyclonal antibodies and one monoclonal using the conventional immunoperoxidase staining technique and a modification of the CLONO-GLAD procedure. TN was found in endothelial and epithelial tissues, particularly in cells with a high turn-over or storage function such as gastric parietal and zymogenic cells absorptive surface epithelium of the small intestine, ducts of exocrine glands and pseudostratified respiratory epithelium. Also mesenchymal cells produced a TN positive staining reaction, which was most conspicious in mast cells, but also present in some lymphocytes, plasma cells, macrophages, granulocytes, striated and smooth muscle cells and fibroblasts. SDS-PAGE and Western blotting analysis of cultured human embryonal fibroblasts (WI-38) showed that the cells besides TN contain another protein with a molecular weight of 82 000. As this protein, however, reacted with our affinity purified antibodies it probably represents a precussor of TN or a protein with a molecular weight of approximately 60 000, which is covalently linked to TN. This and the fact that TN shows amino acid sequence homologiess to the carboxyterminal part of the asialo-glycoprotein receptor and a cartilage proteoglycan core protein as well a binding affinity to plasminogen points to TN as being part of a larger molecule, which possibly has been cleaved by proteolysis at the cellular site and then passed into the blood, where it polymerizes into a tetramer.
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Christensen, L., Clemmensen, I. Tetranectin immunoreactivity in normal human tissues. Histochemistry 92, 29–35 (1989). https://doi.org/10.1007/BF00495012
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DOI: https://doi.org/10.1007/BF00495012