Fig 1: OSMR downregulation attenuates OSM effects on proliferation. (A,B) Immunoblot quantifying the shRNA-induced knockdown of Osmr (n = 4) and Lifr (n = 5) in (A) OP9 and (B) NIH/3T3 cells. The shRNAs Osmr 5 and Lifr 1 were used in subsequent experiments. Protein molecular weight is labeled in kDa. Relative protein quantities are indicated in red. (C) Relative quantification of S phase of OP9 and NIH/3T3 cells carrying a knockdown for either Osmr, Lifr, or a Renilla control in presence or absence of 10 ng/mL mOSM. Cell cycle analysis was performed as described before. One-way ANOVA and Bonferroni post-test. *** p < 0.001. ns = not significant. (D) Immunoblot quantifying the LIFR overexpression in OP9 and NIH/3T3 cells. Protein molecular weight is labeled in kDa. Relative protein quantities are indicated in red. (E) Lifr overexpressing OP9 and NIH/3T3 cells were examined for LIFR surface expression compared to cells carrying the mock control. (F) Relative quantification of S phase of OP9 and NIH/3T3 cells transduced with Lifr or empty vector (MiG). Cell cycle analysis was performed as described before. One-way ANOVA and Bonferroni post-test. * p < 0.05, ** p < 0.01, and *** p < 0.001.