Fig. 6. ID1 interacts with STAT1 to inhibit the transcription of CCL4 and SerpinB2.
a Screening for ID1-interacting transcription factors responsible for CCL4 and SerpinB2 transcription. b Co-immunoprecipitation (Co-IP) of ID1 with STAT1 in HEK 293T cells transfected with STAT1-DDK and ID1-GFP expressing plasmids. n = 1 biologically independent sample. c Immunofluorescent staining of Id1 and Stat1 in TAM-like RAW264.7 cells. Scale bar, 10 μm, n = 3 biologically independent samples. d Proximity ligation assay (PLA) for defining the interaction between Id1 and Stat1 in TAM-like RAW264.7 cells. Scale bar, 10 μm, n = 10 biologically independent samples. e Immunofluorescence staining of ID1, STAT1 and CD68 in tumor tissue from CRC patients. Scale bar, 20 μm, n = 3 biologically independent samples. f Analysis of the luciferase activity of truncated promoter sequences of Ccl4 and Serpinb2 in Ctrl or Id1OE RAW264.7 cells, n = 3 biologically independent samples, Student’s t-test. g Effects of Id1 on Stat1 and p-Stat1 subcellular localization under IFN-γ stimulation in RAW264.7 cells, n = 3 biologically independent samples. h The effects of ID1 on the interaction between STAT1 and CRM1, n = 3 biologically independent samples. i Representative images of PLA and the statistical data showing the protein interaction between STAT1 and CRM1 with ID1 ectopic expression or not, n = 20 biologically independent cells. Scale bar, 5 μm. j Representative images of PLA showing the effects of ID1 on the dimerization and subcellular localization of STAT1 under the treatment of leptomycin B (100 nM), Scale bar, 5 μm, n = 3 biologically independent samples. Source data are provided as a Source Data file.