Interleukin-21 is a growth and survival factor for human myeloma cells

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Interleukin-21 is a growth and survival factor for human myeloma cells by Anne-Tove Brenne, Torstein Baade Ro, Anders Waage, Anders Sundan, Magne Borset, and Henrik Hjorth-Hansen Blood Volume 99(10):3756-3762 May 15, 2002 ©2002 by American Society of Hematology

IL-21 induced DNA synthesis in IL-6–dependent human myeloma cell lines IL-21 induced DNA synthesis in IL-6–dependent human myeloma cell lines.Cell lines IH-1, OH-2, and ANBL-6 were stimulated with IL-21 and IL-6 in concentrations as indicated for 72 hours, and cell lines U-266, JJN-3, and RMPI 8226 were stimulated with IL-21 i... IL-21 induced DNA synthesis in IL-6–dependent human myeloma cell lines.Cell lines IH-1, OH-2, and ANBL-6 were stimulated with IL-21 and IL-6 in concentrations as indicated for 72 hours, and cell lines U-266, JJN-3, and RMPI 8226 were stimulated with IL-21 in the same manner. DNA synthesis was measured by 3H-thymidine incorporation. Data shown are representative of at least 2 different experiments, and error bars represent ± 1 SD of triplicate data. Anne-Tove Brenne et al. Blood 2002;99:3756-3762 ©2002 by American Society of Hematology

IL-21 induced cell proliferation in the cell line OH-2 IL-21 induced cell proliferation in the cell line OH-2.Cells (1 × 106) were grown in RPMI–10% FCS with supplements of IL-21 (10 ng/mL) or IL-6 (1 ng/mL) or without supplement. IL-21 induced cell proliferation in the cell line OH-2.Cells (1 × 106) were grown in RPMI–10% FCS with supplements of IL-21 (10 ng/mL) or IL-6 (1 ng/mL) or without supplement. We counted the cells 3 times a week. Cell number on day 0 was normalized to 1. Data shown are representative of 3 different experiments, and error bars represent ± 1 SD of duplicate data. Anne-Tove Brenne et al. Blood 2002;99:3756-3762 ©2002 by American Society of Hematology

IL-21 protected myeloma cells from apoptosis IL-21 protected myeloma cells from apoptosis.Annexin V–FITC and propidium iodide binding were measured by flow cytometry in cell lines IH-1, OH-2, and ANBL-6 after incubation for 72 hours with IL-21 (20 ng/mL) or IL-6 (1 ng/mL). IL-21 protected myeloma cells from apoptosis.Annexin V–FITC and propidium iodide binding were measured by flow cytometry in cell lines IH-1, OH-2, and ANBL-6 after incubation for 72 hours with IL-21 (20 ng/mL) or IL-6 (1 ng/mL). Typical dot plots for the cell line IH-1 are shown in the upper panel. Percentages of viable cells, located in the lower left quadrant of dot plots, are shown in the lower panel. A patient sample (patient 5 in Table 1) is included in the lower panel. Data shown are representative of 3 different experiments, and error bars represent ± 1 SD of duplicate data. Anne-Tove Brenne et al. Blood 2002;99:3756-3762 ©2002 by American Society of Hematology

TNF stimulation increases IL-21 receptor expression in OH-2 cells TNF stimulation increases IL-21 receptor expression in OH-2 cells.Cells were stimulated with TNF (10 ng/mL) or IL-6 (1 ng/mL) for 18 hours before the addition of streptavidin–PE-conjugated antibodies against IL-21R. TNF stimulation increases IL-21 receptor expression in OH-2 cells.Cells were stimulated with TNF (10 ng/mL) or IL-6 (1 ng/mL) for 18 hours before the addition of streptavidin–PE-conjugated antibodies against IL-21R. Mean fluorescence intensities were 6.3 (control), 8.4 (no cytokine), 8.2 (IL-6), and 10.9 (TNF). Similar patterns were obtained in the cell line ANBL-6, and data shown are representative of 3 different experiments. Anne-Tove Brenne et al. Blood 2002;99:3756-3762 ©2002 by American Society of Hematology

IL-21 and TNF had a synergistic effect on DNA synthesis IL-21 and TNF had a synergistic effect on DNA synthesis.(A) OH-2 cells were incubated with increasing concentrations of IL-21 either alone, with IL-6 (1 ng/mL), or with TNF (10 ng/mL) for 72 hours. 3H-thymidine incorporation was measured. IL-21 and TNF had a synergistic effect on DNA synthesis.(A) OH-2 cells were incubated with increasing concentrations of IL-21 either alone, with IL-6 (1 ng/mL), or with TNF (10 ng/mL) for 72 hours. 3H-thymidine incorporation was measured. Similar results were obtained in the cell line IH-1, and the experiment was repeated twice. (B) A patient sample (patient 5 in Table 1) was incubated for 72 hours with IL-21 (40 ng/mL), IL-6 (1 ng/mL), or TNF (10 ng/mL), and 3H-thymidine incorporation was measured. Error bars in both panels represent ± 1 SD of triplicate data. Anne-Tove Brenne et al. Blood 2002;99:3756-3762 ©2002 by American Society of Hematology

IL-21 signaling was not mediated through IL-6 or gp-130 IL-21 signaling was not mediated through IL-6 or gp-130.OH-2 cells were incubated for 72 hours with IL-6 (1 ng/mL) or with IL-21 (40 ng/mL) in the presence or absence of anti-gp130, anti–IL-6, or soluble IL-21 receptor (sIL-21R). IL-21 signaling was not mediated through IL-6 or gp-130.OH-2 cells were incubated for 72 hours with IL-6 (1 ng/mL) or with IL-21 (40 ng/mL) in the presence or absence of anti-gp130, anti–IL-6, or soluble IL-21 receptor (sIL-21R). DNA synthesis was measured by3H-thymidine incorporation. Similar results were obtained in the cell line IH-1, and data shown are representative of 3 different experiments. Error bars represent ±1 SD of triplicate data. Anne-Tove Brenne et al. Blood 2002;99:3756-3762 ©2002 by American Society of Hematology

IL-21 activated Jak1, Stat3, and Erk1/2, but not Stat1 or NF-κB IL-21 activated Jak1, Stat3, and Erk1/2, but not Stat1 or NF-κB.(A) pYpY1022/1023 Jak1 was detected by Western blotting in the cell line OH-2 after stimulation with IL-6 (1 ng/mL) or IL-21 (40 ng/mL) for 5 and 20 minutes. IL-21 activated Jak1, Stat3, and Erk1/2, but not Stat1 or NF-κB.(A) pYpY1022/1023 Jak1 was detected by Western blotting in the cell line OH-2 after stimulation with IL-6 (1 ng/mL) or IL-21 (40 ng/mL) for 5 and 20 minutes. The same pattern was found in IH-1. (B) pY701 Stat1 and pY705 Stat3 were detected by Western blotting in the cell line OH-2 after stimulation with IL-6 or IL-21 for 10, 20, or 60 minutes. The filter was reblotted for total Stat3. The same pattern was found in IH-1 cells. (C) pT202/pY204-Erk1/2 was detected by Western blotting in the cell line IH-1 after stimulation with IL-6 or IL-21 for 20 minutes. (D) NF-κB activity was detected by ELISA in the cell line OH-2 after stimulation with IL-6 (1 ng/mL), IL-21 (50 ng/mL), or TNF (10 ng/mL). Similar results were obtained in the cell line IH-1. Anne-Tove Brenne et al. Blood 2002;99:3756-3762 ©2002 by American Society of Hematology