Exogenous IL-6 reverses phenotype changes of TROP2-silenced glioblastoma cells. (A) Western blot analysis of JAK2Tyr1007/1008, total JAK2, STAT3Tyr705 and total STAT3 levels in control cells and TROP2-knockdown cells with or without IL-6 exposure. GAPDH was used as loading control. (B and C) Qualification of the data for migration and invasion assays in control cells and TROP2-knockdown cells with or without IL-6 exposure. (D) MTT assays were performed to examine cell viability of control cells and TROP2-knockdown cells with or without IL-6 exposure. (E) Representative images of colony formation assay for control cells and TROP2-knockdown cells with or without IL-6 exposure. All data are shown as the means ± SD; *P<0.05, **P<0.01. All P-values are based on control vs. treatment group. IL-6, interleukin 6; TROP2, trophoblast cell surface antigen 2.