Karyotypes in six leukaemia cell lines derived from patients with ALL

Karyotypic characterization of human T-cell lines immortalized by Herpesvirus saimiri

Herpesvirus saimiri subgroup-C strains transform non-neoplastic human T lymphocytes in vitro to antigen-independent continuous growth. The karyotypes of 8 of these T-cell lines, derived from peripheral blood or bone marrow, are analyzed here. In general, these lines showed a normal diploid karyotype, although one of them had acquired a clonal chromosomal rearrangement after 21 months in culture. Chromosomally aberrant cell clones were found more frequently in cell lines derived from blood lymphocytes of leukemia patients than in cultures from healthy donors. However, the observed aberrations, some of which were defined in detail using chromosome in situ suppression hybridization (CISS) with chromosome-specific recombinant DNA libraries, did not show any relation between the various cell lines nor to the respective types of leukemia.

The karyotype of the glucocorticoid-sensitive, lymphoblastic human T-cell line CCRF-CEM shows a unique deleted and inverted chromosome 9

Chromosome karyotypes were prepared from the highly glucocorticoid-sensitive clone C7 of the human acute lymphoblastic leukemia T-cell line CCRF-CEM. The modal number of chromosomes is 47, and one chromosome #9 has a pericentric inversion of the heterochromatin region (9qh) plus a deletion of the short arm. In most cells, there is an extra chromosome #20. All other chromosomes appear to be normal. Examination of the uncloned line CCRF-CEM (ATCC CCL 119), which was frozen away shortly after the line was originated and has undergone fewer passages than CEM C7, also revealed the same abnormality of chromosome #9. Each of 10 other clones isolated from CCRF-CEM in this laboratory also contained the abnormal chromosome #9.

Establishment and characterization of a B-cell line from a patient with acute lymphoblastic leukemia

A permanent lymphoblastoid cell line was established from the peripheral blood of a child with acute lymphoblastic leukemia. The cell line, designated SDK, grows in a stationary suspension culture, forming aggregates, in RPMI medium supplemented with 10% FCS, with a doubling time of 50-60 h. Immunologic markers and cytological features suggested that the SDK cells should be identified as being of B-cell origin. The cells failed to form rosettes with sheep erythrocytes, did not express T-cell antigens as defined by monoclonal antibodies, and exhibited surface and cytoplasmic immunoglobulin determinants. Chromosome analysis revealed the presence of three cell populations with (a) 46XY; (b) t(8q-; 14q+) or 2p-; 14q+) and (c) cells with unidentifiable markers. SDK demonstrated susceptibility to TPA-induced differentiation toward plasma cells.

Translocations involving chromosomes #3 and #12: hematologic diseases associated with abnormalities of these chromosomes

Two hematologic cases with translocations involving chromosomes #3 and #12 are described. The first case is that of a myeloproliferative disorder (preleukemia?) associated with a (3;12)(q29;q24) translocation in the bone marrow cells. No evidence of leukemic transformation has appeared to date. The second case is that of acute leukemia (AL) (M4 type) in which leukemic cells with t(3;12)(p14;q24) were seen. The roles of chromosomes #3 and #12 in hematopoiesis are considered, and the abnormalities affecting these chromosomes in various hematologic disorders have been tabulated and correlated. Abnormalities in chromosomes #3 and #12 appear to be common and nonrandom in hematologic diseases of a premalignant and a malignant type.

Establishment and cytological characteristics of two in vitro T-cell lines derived from a child with acute lymphatic leukemia and a man with adult T-cell leukemia in Japan

Two permanent T-cell leukemia lines designated KH-1 and KH-2 were established from the peripheral blood of a 9-year-old boy with acute lymphoblastic leukemia and a 47-year-old man with adult T-cell leukemia (ATL). No T-cell growth factor was used. KH-1 cells grew as single cells and KH-2 cells formed clusters in suspension culture. Erosette formation, the absence of immunoglobulin determinants and Epstein-Barr-virus-associated nuclear antigen, and the presence of T-cell antigens revealed by monoclonal antibodies were characteristics of these cell lines as in other established T-cell leukemia lines. Chromosome analysis at the beginning revealed mosaic presence of cells with 46, XY, t(8q+; 15q-) and 46, XY which was later completely replaced by the latter karyotype in KH-1, and abnormal karyotype, 47, XY, +3, t (8q-; 10p+) was maintained throughout the period of in vitro passage in KH-2. The donor patient of KH-2 formerly lived in the south-western part of Japan where ATL is considered endemic and numerous type-C virus particles were detected electron microscopically, in KH-2 cell pellets.