title: Isozymes of amino acid naphthylamidase in human haematopoietic cell lines.
abstract: The occurrence of isozymes of the proteolytic enzyme amino acid naphthylamidase was investigated in a panel of 44 neoplastic and non-neoplastic haematopoietic cell lines by polyacrylamide gel electrophoresis. Two isozymes (A and C) were common for all lines, whereas different forms of a third isozyme with intermediate electrophoretic mobility (B) appeared in nine lines. Isozyme A seemed to be associated with cell proliferation and was not a marker for malignancy. The appearance of different B isozymes not present in normal peripheral blood lymphocytes, occurred in some Burkitt lymphoma lines and in two non-malignant lines maintained for a long time in culture. In three lines derived from myeloid leukaemia a variant of isozyme B seemed to be a marker for cell origin.
mesh_terms: D000626:Aminopeptidases / Q000378:metabolism*; D002460:Cell Line; D004591:Electrophoresis, Polyacrylamide Gel; D006412:Hematopoietic Stem Cells / Q000201:enzymology*; D006801:Humans; D007527:Isoenzymes / Q000378:metabolism*; D007938:Leukemia / Q000201:enzymology; D008223:Lymphoma / Q000201:enzymology
chemical_list: D007527:Isoenzymes; D000626:Aminopeptidases