title: Calcium-binding proteins in human carcinoma cell lines.
abstract: Elevated levels of Ca2+-binding proteins are reported in transformed cells and thought to be involved in their uncontrolled proliferation and often increased motility. Therefore, three cell lines [LICR(Lond)-HN 1, -HN 2, and -HN 6] derived from human carcinomas displaying various degrees of locomotive activity were investigated for the presence of parvalbumin and related Ca2+-binding proteins. By applying different immunohistochemical methods in conjunction with a monospecific anti-parvalbumin antiserum, an intense staining was seen in cells displaying translocative motility. Often in these cells, an association with filamentous structures located in the nuclear region was observed. Unique Ca2+-binding proteins, absent from comparable normal tissue, were found in the malignant cell lines when analyzed by two-dimensional polyacrylamide gel electrophoresis and high-performance liquid chromatography. From these tumor cells a protein (Mr, 12,000; pI, 4.8) was isolated that crossreacted with antiparvalbumin antiserum. Peptide maps of this protein revealed a further structural homology to parvalbumin (Mr, 12,000; pI, 4.9). In analogy to muscle, where there is evidence for a regulatory role of parvalbumin in the contraction-relaxation cycle, we speculate that this protein is tumor-associated and connected to the motile behavior of carcinoma cells.
mesh_terms: D002135:Calcium-Binding Proteins / Q000378:metabolism*; D002147:Calmodulin / Q000378:metabolism; D002294:Carcinoma, Squamous Cell / Q000378:metabolism*; D002460:Cell Line; D002851:Chromatography, High Pressure Liquid; D004591:Electrophoresis, Polyacrylamide Gel; D005455:Fluorescent Antibody Technique; D006651:Histocytochemistry; D006801:Humans; D007124:Immunoenzyme Techniques; D007822:Laryngeal Neoplasms / Q000378:metabolism*; D010320:Parvalbumins / Q000378:metabolism; D014062:Tongue Neoplasms / Q000378:metabolism*
chemical_list: D002135:Calcium-Binding Proteins; D002147:Calmodulin; D010320:Parvalbumins; C034733:oncomodulin