MI during active phase (ZT13) leads to infarct expansion and reduced cardiac function MI during active phase (ZT13) leads to infarct expansion and reduced.

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Presentation transcript:

MI during active phase (ZT13) leads to infarct expansion and reduced cardiac function MI during active phase (ZT13) leads to infarct expansion and reduced cardiac function Permanent LAD occlusion was performed at ZT5 or ZT13. TTC staining (white, infarct; red, vital myocardium) and quantification of infarct size normalized to the left ventricle (LV). Student's t‐test; n = 4 mice for ZT5 and n = 5 for ZT13 MI; *P = 0.0041.Plasma troponin I levels 24 h after MI. Student's t‐test; n = 4 mice for ZT5 and n = 5 for ZT13 MI; *P = 0.0007.Flow cytometric analysis of dead cardiomyocytes (CD45−, Zombie+) 24 h after MI. Student's t‐test; n = 3 mice in both groups; *P = 0.0072.Survival rates after MI and cause of death. Log‐rank test; n = 87 mice in both groups; *P = 0.0006.Myofibroblasts within infarcts were quantified by alpha‐smooth muscle actin (αSMA) staining as ratio between stained and total area of random fields. Student's t‐test; n = 4 mice in both groups; *P = 0.0134.Masson's trichome staining of fibrosis (blue, collagen; red, vital myocardium) and quantification relative to total LV (*P = 0.0095) as well as LV anterior wall thickness (*P = 0.0068) 7 days after MI. Student's t‐test; n = 6 mice for ZT5 and n = 7 for ZT13 MI.Analysis of relative collagen type I content identified by Sirius Red staining 7 days after MI. Student's t‐test; n = 4 mice for ZT5 and n = 5 for ZT13 MI; *P = 0.0175.Echocardiographic assessment of ejection fraction (EF), end‐systolic volume (ESV), and end‐diastolic volume (EDV). Two‐way ANOVA; n = 6 mice for no MI for both groups, n = 6 for ZT5 and n = 9 for ZT13 at 72 h post‐MI, n = 8 for both groups at 7 days post‐MI, and n = 7 for ZT5 and n = 5 for ZT13 at 14 days post‐MI; ZT5 versus ZT13: *P = 0.0001 (EF, 3 days), *P = 0.0042 (EF, 7 days), *P = 0.0121 (EF, 14 days); *P = 0.0253 (ESV, 3 days), *P = 0.0421 (ESV, 7 days), *P = 0.0005 (ESV, 14 days); *P = 0.0053 (EDV, 14 days).Data information: All data are expressed as mean ± SEM. Maximilian J Schloss et al. EMBO Mol Med. 2016;emmm.201506083 © as stated in the article, figure or figure legend