Fig. 2

miR-27a/b suppress human PINK1 expression. a Schematic diagram of the conserved target sites of miR-27a/b in the 3′UTR of human PINK1 mRNA. Seed sequences were indicated in red. Asterisks (*) indicate the conserved nucleotides. b Schematic diagram of the luciferase reporter plasmids. The reporter constructs contain the full-length 3′UTR of human PINK1 mRNA with wild-type (WT) or mutated (Mut) seed match sites downstream of Renilla luciferase gene. c Overexpression of miR-27a/b decreased luciferase activities in HeLa cells. Cells were transfected with miR-27a/b or negative control (Ctl) along with reporter constructs as indicated. 48 h post-transfection, luciferase activities were measured (n = 4, one-way ANOVA). Renilla luciferase activity was normalized to the corresponding firefly luciferase activity. d-g Overexpression of miR-27a/b decreased PINK1 protein levels in HeLa (D-E) and M17 cells (F-G). Cells were transfected with miR-27a/b or negative control (Ctl). 48 h post-transfection, cells were harvested for Western blot (n = 4, t-test). PINK1 protein level was normalized to corresponding GAPDH level and quantified as a percentage of control. Data are shown as a percentage of control. Values are mean ± SEM (n.s. = non-significant, **p < 0.01, ***p < 0.001)