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. 2021 May 10;4:540. doi: 10.1038/s42003-021-02071-8

Fig. 4. FMRP promotes the IL-6-mediated translation of STAT3 mRNA.

Fig. 4

a Effect of STAT3 activator IL-6 (50 ng/mL) on the expression of STAT3. Q-PCR and Western blot analysis of the relative expression of STAT3 mRNA and protein after IL-6 treatment in the indicated time points. b Western blot of nuclear and cytoplasmic distribution of total STAT3 and pSTAT3 after the treatment of IL-6 in the indicated time points. c Immunofluorescence analysis of STAT3 expression after IL-6 treatment in the indicated time points. Scale bar: 25 μm. d Q-PCR and Western blot analysis of STAT3 expression in control and two FMRP-knockdown HCCLM3 cells. e Immunofluorescence analysis of STAT3 in control and FMRP-overexpressing HCCLM3 cells. Scale bar: 50 μm. f Western blot analysis of STAT3 expression in HCCLM3-Control and HCCLM3-sh-FMRP#1 cells treated with 100 μg/mL cycloheximide (CHX) and/or IL-6 (50 ng/mL). g Western blot analysis of the effects of wild-type FMRP (WT) and mutated FMRP on the IL-6-mediated STAT3 translation. IL-6 failed to enhance the expression of STAT3 when the S114 was mutated. The right panel is the quantification of the intensity relative to β-actin. The values in the graphs represent the mean of three biologically independent experiments. Error bars represent ±s.d. *P < 0.05, **P < 0.01, ***P < 0.001 by two-tailed Student’s t-test.