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• W1998802606 abstract "It has been shown that granulocyte/macrophage colony stimulating factor (GM-CSF) is able to support myeloma cell propagation in cooperation with interleukin (IL)-6, the major growth factor for malignant plasma cells, although the biological mechanisms involved remain unknown. Therefore we investigated (i) the expression levels of the GM-CSF receptor (GM-CSFR) constituents in three malignant plasma cell lines and in native malignant plasma cells, (ii) the ability of the receptor to mediate common signalling pathways regulating proliferation and cell survival in malignant plasma cell lines, and (iii) the effects of GM-CSF on tumour cell biology. The GM-CSFRalpha subunit was detected in the malignant plasma cell lines RPMI-8226, MC/CAR, IM-9 as well as 6/6 native myeloma cell samples derived from the bone marrow of patients with overt disease. Furthermore, GM-CSFR expression was also detected in the CD19+ fraction from 2/3 bone marrow samples and 5/8 peripheral blood samples derived from patients with malignant plasma cell disorders, but not in the CD19+ fraction of peripheral blood from healthy donors. The expressed cytokine receptor alpha-subunit was able to constitute a functional signalling complex with the ubiquitously expressed GM-CSFRbeta subunit, as demonstrated by the fact that GM-CSF induced the p21-ras/mitogen-activated protein kinase (MAPK) signalling cascade in malignant plasma cell lines. Since this signalling cascade plays an essential role in the mediation of both proliferation and cell survival, we investigated the impact of GM-CSF on these two events. Application of GM-CSF led to an increase of DNA-synthesis in MC/CAR, IM-9 and RPMI-8226 cells. Furthermore, it increased longevity of these malignant plasma cell lines by reducing the rates of spontaneous apoptosis. We conclude that (i) the functional GM-CSFR is commonly expressed on malignant plasma cells and that (ii) GM-CSF promotes the clonal expansion of myeloma cells by inhibiting spontaneous apoptosis and promoting DNA synthesis." @default.
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• W1998802606 date "1998-09-01" @default.
• W1998802606 modified "2023-09-26" @default.
• W1998802606 title "Functional granulocyte/macrophage colony stimulating factor receptor is constitutively expressed on neoplastic plasma cells and mediates tumour cell longevity" @default.
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• W1998802606 doi "https://doi.org/10.1046/j.1365-2141.1998.00880.x" @default.
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