Figure 6: MiR-212 and miR-132 inhibit starvation-induced autophagy in vivo.
From: The miRNA-212/132 family regulates both cardiac hypertrophy and cardiomyocyte autophagy
(a) Schematic representation of starvation experiment in mice. The white and grey parts on the time line represent the day and night phases, respectively. The arrow shows the start and duration of the starvation and the indicated time points of starvation are when animals are scored for body conditioning index. (b) LC3II to LC3I ratios in wild-type (WT) mice fed with normal diet and WT, miR-212/132−/− null and α-MHC miR-212/132 transgenic (TG) mice under starvation for 31 h (n=4). (c) Electron micrographs from ultrathin sections of resin-embedded heart biopsies of fed and starved WT, miR-212/132 null (KO) and cardiomyocyte-specific miR-212/132-overexpressing (TG) mice. White spots around the mitochondria (dark grey structures) are autophagic vacuoles. The electron-dense black spots shown with white arrows are autophagosomes. Scale bars, 4 μm. (d) p-mTOR/mTOR ratios in WT and miR-212/132 TG H9c2 cells 24 h after normal and starvation (serum/glucose-deprived) conditions (n=6). (e) p-mTOR/mTOR ratios in hearts of WT and α-MHC miR-212/132 TG mice fed with normal diet or 31 h after starvation (n=4). M, size marker. All values represent mean±s.e.m. **P<0.01; ***P<0.005; #P=0.11.
