title: Differentiation of myeloid cells is accompanied by increased levels of pp60c-src protein and kinase activity.
abstract: We have detected a significant increase in the levels of pp60c-src kinase activity associated with the differentiation of myeloid cell lines HL-60 and U-937. The induction of pp60c-src kinase activity becomes apparent approximately 14 hr after the addition of phorbol 12-myristate 13-acetate and increases 20-fold by 72 hr. The enhanced kinase activity can be accounted for by elevated levels of c-src protein in the differentiated cells. When nonleukemic bone marrow cells were examined, myeloid progenitor cells exhibited a low level of pp60c-src kinase activity. As these cells are allowed to differentiate in culture, the resulting adherent monocytes are as high in pp60c-src kinase activity as HL-60 cells induced to differentiate into monocytes. A strong correlation is found between the levels of pp60c-src kinase activity and the degree of monocytic differentiation of the cells from patients with acute myeloid leukemia. Our findings suggest that the activation of pp60c-src kinase activity is a normal physiological event associated with myeloid differentiation.
mesh_terms: D002454:Cell Differentiation / Q000187:drug effects; D002460:Cell Line; D006801:Humans; D007948:Leukemia, Monocytic, Acute / Q000473:pathology*; D015470:Leukemia, Myeloid, Acute / Q000473:pathology*; D008297:Male; D009000:Monocytes / Q000473:pathology; D009363:Neoplasm Proteins / Q000378:metabolism; D010766:Phosphorylation; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D011518:Proto-Oncogene Proteins / Q000378:metabolism*; D016392:Proto-Oncogene Proteins pp60(c-src); D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
chemical_list: D009363:Neoplasm Proteins; D011518:Proto-Oncogene Proteins; D011505:Protein-Tyrosine Kinases; D016392:Proto-Oncogene Proteins pp60(c-src); D013755:Tetradecanoylphorbol Acetate