Fig 2: Syntabulin affects ASIC2 expression levels and regulates neuronal toxicity.(A) Neurons were infected with syntabulin shRNA lentivirus as indicated at DIV5 and examined at DIV13. Syntabulin knockdown significantly increased total ASIC2 expression but reduced surface ASIC2 levels as compared with the levels in control and scrambled-shRNA control. (B) Quantification of normalized ASIC2/GAPDH ratio, total ASIC2/surface ASIC2 ratio and surface ASIC2 levels. One-way ANOVA and Sidak test; **P = 0.008, and P = 0.009 for Stb sh#1 Total ASIC2/GAPDH and Surface ASIC2/GAPDH compared to control respectively; *P = 0.044 and *P = 0.016 for Stb #1 total ASIC2/GAPDH and Surface/Total ASIC2 ratio compared to scrambled shRNA control respectively; *P = 0.020 for Stb #1 Surface/Total ASIC2 ratio compared to control; “ns” P > 0.05. n = 4 − 6 independent experiments. Error bars represent the SEM. (C,D) Hoechst staining of neurons after syntabulin knockdown, in pH 7.4 solution and pH6.0 solution. Knockdown of syntabulin significantly increased cell death as compared with controls in pH6.0. Scale bar = 20 μm. (E) Quantification of normalized total Hoechst intensity. One-way ANOVA and Sidak test; *P = 0.035 compared to control; *P = 0.043 compared to scrambled-shRNA control; “ns” P > 0.05; n = 6 independent experimental repeats. Error bars represent the SEM.