Impaired ECM protein synthesis in infarcted area of S100a4cre+/− × Fstl1flox/flox mice Impaired ECM protein synthesis in infarcted area of S100a4cre+/−

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Impaired ECM protein synthesis in infarcted area of S100a4cre+/− × Fstl1flox/flox mice Impaired ECM protein synthesis in infarcted area of S100a4cre+/− × Fstl1flox/flox mice Transcript mRNA expression of Col1a1 and Fn1 in sham and post‐MI hearts. Hearts were obtained at day 7 after surgery. Error bars represent mean ± SEM (n = 13–16 for each group). Statistical analysis was performed by two‐way ANOVA. Post hoc test was performed by Tukey's test.Protein expression of collagen I, fibronectin and α‐SMA in the infarcted and sham hearts at day 7 after surgery, as assessed by Western blotting. Quantified values of proteins of interest were normalized relative to the tubulin band intensity. Error bars represent mean ± SEM. Statistical analysis was performed by unpaired t‐test (two‐tailed) for fibronectin and α‐SMA and nonparametric t‐test (two‐tailed) for collagen I (fibronectin and collagen: n = 5 per group, α‐SMA: n = 3 and 4 for WT‐IA and cfKO‐IA, respectively).α‐smooth muscle actin‐positive myofibroblasts (red) were stained in histological sections from infarcted hearts of WT and cfKO mice. Samples were harvested at day 7 after MI. Counter staining was performed by hematoxylin. Scale bar indicates 100 μm for top and middle images and 50 μm for bottom images. Error bars represent mean ± SEM. Statistical analysis was performed by Mann–Whitney U‐test (n = 16 for WT and n = 14 for cfKO).Representative images of Picrosirius red staining of infarcted heart at 7 days after MI surgery. Images were taken by standard light (top) and polarized light microscopes. Scale bar indicates 100 μm. Polarized collagen fibers were sorted to orange‐red (middle) and green‐yellow (bottom) fibers by ImageJ software. Error bars represent mean ± SEM. Statistical analysis was performed by unpaired t‐test (two‐tailed) (n = 11 for WT and n = 13 for cfKO). Source data are available online for this figure. Sonomi Maruyama et al. EMBO Mol Med. 2016;8:949-966 © as stated in the article, figure or figure legend