Abstract：
:A megakaryoblastic cell line, termed T-33, was established from the peripheral blood of a patient with Philadelphia chromosome-positive chronic myelogenous leukemia in megakaryoblastic crisis. T-33 cells have been maintained in RPMI 1640 medium containing 10% fetal calf serum in a single cell suspension with a doubling time of 24-36 h for over 2 years. Giemsa-banded karyotypes were female hyperdiploid with a modal chromosomal number of 51, all cells including Philadelphia chromosome. The cells showed strong positivity for periodic acid-Schiff and alpha-naphthyl acetate esterase, and weak for alpha-naphthyl butyrate esterase, but were negative for myeloperoxidase. Flow cytometric analysis of cell surface markers showed the existence of HLA-DR, MY-7, MY-9, and a platelet antigen (Yukb), and no markers for T- or B-lymphocytes. Most of the cells fixed with acetone were positive for Factor VIII, platelet glycoprotein IIb-IIIa, IIIa (Yukb), and Ib, but negative for glycophorin A and hemoglobin. Ultrastructural platelet peroxidase was demonstrated in 2-3% of cells and the percentage of positive cells increased up to 20% after the treatment with 12-O-tetradecanoylphorbol-13-acetate. The cells contained small dense granules negative for platelet peroxidase, their number increasing threefold after 12-O-tetradecanoylphorbol-13-acetate treatment. Such treated cells frequently showed a complex of the demarcation membrane in the cytoplasm. T-33 responded thrombin to exhibit calcium influx. This cell line may be useful for the study of the early stage of megakaryocytic differentiation in human megakaryopoiesis.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Tange T,Nakahara K,Mitani K,Yamasaki I,Yasuda H,Tanaka F,Mizuguchi M,Oda H,Yatomi Y,Takanashi Rsubject
Has Abstract,Author List Incompletepub_date
1988-11-01 00:00:00pages
6137-44issue
21eissn
0008-5472issn
1538-7445journal_volume
48pub_type
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