Fig. 2. IL-33/ST2 signal in OSCC regulates the expression of PD-L1.
a Knockdown effect of ST2 in HN6, Cal27 and Hsc3 by WB analysis. b Luciferase activity in CD274 promoter region after ST2 knockdown. c Transcriptome sequencing of ST2 knockdown cell lines. d ELISA showed an increased IL-33 level in medium from CAFs compared with NFs. e Overexpression of ST2 promoted IL-33-induced PD-L1 expression. f The expression and localization of PD-L1 and ST2 were analyzed by immunofluorescence staining. g The mRNA expression correlation between IL-33/ST2 and PD-L1 was analyzed by database (http://www.cbioportal.org/) and in 45 cases of oral squamous cell carcinoma. h The expression of ST2 and PD-L1 in 9 oral cancer cell lines detected by qPCR. i Expression of ST2 in PD-L1high and PD-L1Low sorting cell line detected by qPCR. Results are shown as mean ± SEM. *p < 0.05, **p < 0.01, ***p < 0.001. p = two-tailed t test.