Journal: Molecular Cancer
Article Title: STAT3/LKB1 controls metastatic prostate cancer by regulating mTORC1/CREB pathway
doi: 10.1186/s12943-023-01825-8
Figure Lengend Snippet: STAT3 and LKB1 cooperate to suppress mTORC1. A Western blot analysis of STAT3 and LKB1 in 22Rv1 cells transfected with non-targeting (NT) or shRNAs specific for STAT3 and/or LKB1. B qRT–PCR analysis of STAT3 and STK11 in 22Rv1 cells transfected with NT or shRNA specific for STAT3 ( n = 3 each). C ChIP analysis of STAT3 binding to LKB1 (STK11) promoter. 22Rv1 cells harboring NT or two different shSTAT3 constructs were stimulated with IL-6 and immunoprecipated with STAT3 antibody or IgG as a negative control. Bars represent mean ± s.d. from 2 technical replicates. Precipitated DNA is presented as % of input. D IHC analysis of p-4E-BP1, 4E-BP1, p-S6 in prostates from 19-week-old WT, Pten pc−/− , Pten pc−/− Stat3 pc−/− and Pten pc−/− Stat3 C/ + mice. Scale bars, 100 μm. E Western blots analysis of p-4E-BP1, 4E-BP1, p-S6 and S6 expression in prostates from 19-week-old WT, Pten pc−/− , Pten pc−/− Stat3 pc−/− and Pten pc−/− Stat3 C/ + mice. β-actin serves as a loading control. F H&E and IHC analyses of Stat3, p-S6 and p-4E-BP1 in prostates and lung metastases from Pten pc + /− and Pten pc + /− Stk11 pc−/− mice, scale bars, 100 μm. Quantification of cells positive for STAT3 and p-4E-BP1 in 19-week-old Pten pc + /− and Pten pc + /− Stk11 pc−/− prostate tissue or lung metastases using HistoQuest software ( n = 3). Data were analyzed by Student’s t -test and are shown as mean ± s.d
Article Snippet: For the knockdown of STAT3 in 22Rv1 and LNCaP cells, the following short hairpin RNA (shRNA) constructs from the Mission TRC shRNA library (Sigma) were used: scrambled control shRNA (SHC002), shSTAT3#456 (TRCN0000071456), shSTAT3#843 (TRCN000002084310.1002/ijc.31724).
Techniques: Western Blot, Transfection, Quantitative RT-PCR, shRNA, Binding Assay, Construct, Negative Control, Paraffin-embedded Immunohistochemistry, Expressing, Control, Software