Fig. 5

DPP4 facilitated HG-induced HK-2 cell pyroptosis by activating JNK and suppressing SIRT3 and FGFR1. A and B Western blot analyses. A and quantitative data (B) showed that knocking down by siRNA diminished HG-induced DPP4 expression and phosphorylated JNK, and restored HG-reduced SIRT3 and FGFR1 abundance. (n = 3). C and D Flow cytometry analysis showed that knocking down DPP4 reduced HG increased active Caspase1⁺PI⁺ HK-2 cells (C) and quantitative data (D) (n = 3). E DPP4 was ablated in HG stimulated HK-2 cells, and the Caspase1 activity in cell lysis was determined by kits. F and G Western blot analyses (F) and quantitative data (G) showed that DPP4 siRNA attenuated HG-induced NLRP3, cleaved-Caspase1, GSDMD-N, IL-1β and IL-18 expression in HK-2 cells (n = 3). ( Hand I) DPP4 was knocked down in HG treated HK-2 cells, and the IL-1β (H), IL-18 (I) or IL-6 (J) concentration in the culture medium was determined by ELISA, and then normalized by protein concentration in cell lysates (n = 3). Data are presented as mean ± SEM of biologically independent samples. ∗ P < 0.05, ∗∗ P < 0.01. One-way ANOVA was used to analyze the data among multiple groups, followed by Tukey’s post hoc test