title: Establishment and characterization of a novel cell line, TK-6, derived from T cell blast crisis of chronic myelogenous leukemia, with the secretion of parathyroid hormone-related protein.
abstract: We established a novel T cell line, designated TK-6, from a patient with T cell lineage blast crisis of chronic myelogenous leukemia (CML) complicated by hypercalcemia. A surface marker study showed T cell phenotype, cluster designation (CD)4, CD5 and CD7. Light and electron microscopic examination revealed myeloperoxidase (MPO)-negative, however, ultrastructural examination under certain specific conditions demonstrated that some cells were MPO-positive. The TK-6 cell karyotype carried a t(9;22)(q34;q11) and additional chromosome aberrations, including a deletion of the long arm of chromosome 6 and the abnormality of chromosome 7. Southern blot analysis showed rearrangement of the T cell receptor beta-chain (TCR beta) gene and the major breakpoint cluster region (bcr) gene. Northern blot analysis detected the expression of the parathyroid hormone-related protein (PTHrP) gene, however, the proviral genome of human T cell leukemia virus type I (HTLV-I) was negative. This cell line will provide a valuable resource for the analysis of the relationship between T cell lineage crisis and myeloid differentiation and for the analysis of humoral hypercalcemia of malignancy (HHM) or leukemia.
mesh_terms: D000328:Adult; D001483:Base Sequence; D001752:Blast Crisis / Q000473:pathology*; D002118:Calcium / Q000378:metabolism; D002467:Cell Nucleus / Q000648:ultrastructure; D002869:Chromosome Aberrations / Q000473:pathology; D002871:Chromosome Banding; D025063:Chromosome Disorders; D016207:Cytokines / Q000378:metabolism; D017931:DNA Primers / Q000737:chemistry; D004279:DNA, Viral / Q000032:analysis; D015326:Gene Rearrangement, B-Lymphocyte, Heavy Chain; D015333:Gene Rearrangement, beta-Chain T-Cell Antigen Receptor; D005803:Genes, Immunoglobulin; D015368:Human T-lymphotropic virus 1 / Q000235:genetics; D006801:Humans; D016130:Immunophenotyping; D007621:Karyotyping; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000473:pathology*; D008297:Male; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000378:metabolism; D044162:Parathyroid Hormone-Related Protein; D011506:Proteins / Q000378:metabolism*; D013601:T-Lymphocytes / Q000166:cytology*; D014407:Tumor Cells, Cultured / Q000166:cytology*
chemical_list: D016207:Cytokines; D017931:DNA Primers; D004279:DNA, Viral; D009363:Neoplasm Proteins; C470121:PTHLH protein, human; D044162:Parathyroid Hormone-Related Protein; D011506:Proteins; D002118:Calcium