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- W2405247265 abstract "Abstract We report here experiments on the analysis of cellular signal transduction in a series of patients with chronic B cell disorders (B cell chronic lymphocytic leukemia [B-CLL] and prolymphocytic leukemia). We compared the response of the leukemic cells with primary external signals (interleukin 2 [IL-2] or B cell differentiation factors [BCDF or IL-6]) with their response to secondary inducers (the phorbol ester (12–O-tetradecanoylphorbol-13-acetate [TPA] or the calcium ionophore A23187) that circumvent the first part of the signal transduction pathway by directly activating the key enzyme protein kinase C. One BCDF was synthesized by mitogen-activated peripheral blood B lymphocytes; a second BCDF was constitutively produced by the human bladder carcinoma cell line T24. Changes in morphology, Tac (IL-2 receptor) expression, RNA synthesis measured by 3H-uridine uptake, and immunoglobulin production tested by enzyme-linked immunosorbent assay were used as parameters of successful signal transduction. TPA alone and TPA plus A23187 (synergistically) effectively initiated differentiation in all the leukemia cases. Neither IL-2 nor BCDF (singly or in combinations) caused equivalent responses. On the other hand, IL-2 and BCDF produced a substantial differentiation effect on normal B lymphocytes. Our data suggest that (a) B-CLL cells are able to respond to direct stimulation of the second messenger pathway (through protein kinase C) but not to the physiological stimuli IL-2 or BCDF; (b) the defect in signal transduction appears to be located upstream of protein kinase C (a possible candidate is a G protein); (c) malignant B cells may spontaneously or after treatment with inducers express the IL- 2 receptor (Tac antigen) in the absence of a functional differentiating response to IL-2; and (d) signs of proliferation/differentiation in B- CLL samples after incubation with IL-2 or BCDF might be due to contamination of the cell populations with residual normal B cells." @default.
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- W2405247265 date "1988-05-01" @default.
- W2405247265 modified "2023-10-07" @default.
- W2405247265 title "Analysis of signal transduction in B chronic lymphocytic leukemia cells" @default.
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- W2405247265 doi "https://doi.org/10.1182/blood.v71.5.1461.1461" @default.
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