Journal: The Journal of Biological Chemistry
Article Title: Engineered interleukin-6-derived cytokines recruit artificial receptor complexes and disclose CNTF signaling via the OSMR
doi: 10.1016/j.jbc.2024.107251
Figure Lengend Snippet: GIL-6 induces JAK/STAT signaling and cellular proliferation via non-natural cytokine receptor complexes. A , proliferation of Ba/F3-gp130, Ba/F3-IL-6R:gp130, Ba/F3-gp130:OSMR, Ba/F3-gp130:LIFR, Ba/F3-IL-6R:gp130:OSMR, Ba/F3-IL-6R:gp130:OSMR, Ba/F3-IL-6R:gp130:LIFR cells without cytokine (−), with 100 ng/ml HIL-6, 10 ng/ml IL-6, 10 ng/ml LIF, 10 ng/ml OSM, 100 ng/ml GIL-6, 100 ng/ml GIO-6 and 100 ng/ml IC7. Data represents mean±S.D. of three independent experiments. For statistics the treated groups were compared with the untreated group by two-way ANOVA including Dunnet’s test for correction in multiple comparison. B , STAT3 activation in Ba/F3, Ba/F3-gp130, Ba/F3-IL-6R:gp130, Ba/F3-gp130:OSMR, Ba/F3-gp130:LIFR, Ba/F3-IL-6R:gp130:OSMR, Ba/F3-IL-6R:gp130:LIFR cells without cytokine (−) and after stimulation with 100 ng/ml HIL-6, 10 ng/ml IL-6, 10 ng/ml LIF, 10 ng/ml OSM, 100 ng/ml GIL-6, 100 ng/ml GIO-6 and 100 ng/ml IC7 for 20 min. C , STAT1, STAT3, STAT5, ERK, and Akt activation in Ba/F3-IL-6R:gp130:LIFR cells with the same conditions as for the STAT3 activation. D , STAT3 activation in heart, liver, and spleen after injection of 20 μg GIL-6 or GIO-6. Mice were sacrificed 30 min after intraperitoneal cytokine injection. Equal amounts of proteins (50 μg/lane) were analyzed via specific antibodies detecting phospho-STAT3 and STAT3. Western blot data shows one representative experiment out of three. E , schematic illustration of IC7. Site 3 of IL-6 ( red ) comprising site 3-1, 3-2, and 3-3 was exchanged by site III of CNTF ( grey ) resulting in IC7. Consequently, IC7 forms tetrameric IC7:IL-6R:gp130:LIFR or IC7:IL-6R:gp130:OSMR complexes.
Article Snippet: Anti-OSMR (catalog no. BAF4389), LIFR (catalog no. BAF249) (R&D Systems) were diluted 1:2000.
Techniques: Comparison, Activation Assay, Injection, Western Blot