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• W253133065 abstract "Abstract Two receptors for tumor necrosis factor (TNF) with different molecular weight (75-Kd and 55-Kd) and binding affinity have been recently discovered. To investigate the distribution and the functional role of these receptors on leukemic B cells from hairy cell leukemia (HCL) and B-cell chronic lymphocytic leukemia (B-CLL) patients, we evaluated: (1) the cytofluorimetric pattern of uncultured and cultured leukemic B cells incubated with utr-1 and htr-9 monoclonal antibodies (MoAbs), which specifically recognize the 75-Kd and 55-Kd TNF receptors (TNFR), respectively; (2) the effect of TNF-alpha and TNF-beta on leukemic B cells in an in vitro proliferation assay; (3) the role of anti-TNFR MoAbs on TNF-alpha and TNF-beta-driven B-cell growth; and (4) the proliferative effect of utr-1 and htr-9 MoAbs on in vitro cultured leukemic cells. Our study shows that the high affinity (75-Kd) but not the low affinity (55-Kd) TNFR molecules are expressed on freshly isolated leukemic B cells recovered from HCL and B-CLL patients. The expression of these receptors was neither upregulated nor downregulated by different stimuli, including TNF-alpha, TNF-beta, B-cell growth factor, and interleukin-2. TNF-alpha efficiently triggers the proliferation of HC and, to a lesser extent, the growth of B-CLL cells. TNF-beta was also able to transduce the proliferative signal in HCL, but not in B-CLL patients. TNF-alpha- and TNF-beta-driven B-cell proliferation was inhibited by the preincubation of leukemic B cells with utr-1 but not htr-9 MoAb. Moreover, anti-75-Kd, but not anti-55-Kd TNFR MoAb, was able to trigger the proliferation of leukemic B cells, and in particular of HC. These results show that leukemic B cells from patients with HCL and B-CLL are equipped with a fully functional high affinity TNFR." @default.
• W253133065 created "2016-06-24" @default.
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• W253133065 date "1993-02-01" @default.
• W253133065 modified "2023-09-27" @default.
• W253133065 title "Expression and functional role of tumor necrosis factor receptors on leukemic cells from patients with type B chronic lymphoproliferative disorders" @default.
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• W253133065 doi "https://doi.org/10.1182/blood.v81.3.752.752" @default.
• W253133065 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/8381309" @default.
• W253133065 hasPublicationYear "1993" @default.
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