Sleep restriction after myocardial infarction in rats worsened echocardiographic indexes, increased oxidative stress, and upregulated markers of myocardial damage (p<0.05).
RCT (n=40)
randomly assigned
Does sleep restriction after myocardial infarction worsen cardiac remodeling and function in a rat model?
Sleep restriction after myocardial infarction in rats exacerbates cardiac remodeling, oxidative stress, and ubiquitin-proteasome system imbalance, leading to worsened cardiac dysfunction.
p-value: p=<0.05
Sleep disruption after myocardial infarction (MI) by affecting ubiquitin-proteasome system (UPS) is thought to contribute to myocardial remodeling and progressive worsening of cardiac function. The aim of current study was to test the hypothesis about the increased risk of developing heart failure due to experience of sleep restriction (SR) after MI. Male Wistar rats (n = 40) were randomly assigned to four experimental groups: (1) Sham, (2) MI, (3) MI and SR (MI + SR) (4) Sham and SR (Sham + SR). MI was induced by permanent ligation of left anterior descending coronary artery. Twenty-four hours after surgery, animals were subjected to chronic SR paradigm. Blood sampling was performed at days 1, 8 and 21 after MI for determination of serum levels of creatine kinase-MB (CK-MB), corticosterone, malondialdehyde (MDA) and nitric oxide (NO). Finally, at 21 days after MI, echocardiographic parameters and expression of MuRF1, MaFBx, A20, eNOS, iNOS and NF-kB in the heart were evaluated. We used H&E staining to detect myocardial hypertrophy. We found out that post infarct SR increased corticosterone levels. Our results highlighted deteriorating effects of post-MI SR on NO production, oxidative stress, and echocardiographic indexes (p < 0.05). Moreover, its detrimental effects on myocardial damage were confirmed by overexpression of MuRF1, MaFBx, iNOS and NF-kB (p < 0.001) in left ventricle and downregulation of A20 and eNOS (p < 0.05). Furthermore, histological examination revealed that experience of SR after MI increased myocardial diameter as compared to Sham subjects (p < 0.05). Our data suggest that SR after MI leads to an enlargement of the heart within 21 days, marked by an increase in oxidative stress and NO production as well as an imbalance in UPS that ultimately results in cardiac dysfunction and heart failure.
Aghajani et al. (Fri,) conducted a rct in Myocardial infarction (n=40). Sleep restriction vs. Sham or MI without sleep restriction was evaluated on Echocardiographic indexes, oxidative stress, NO production, and myocardial damage markers (p=<0.05). Sleep restriction after myocardial infarction in rats worsened echocardiographic indexes, increased oxidative stress, and upregulated markers of myocardial damage (p<0.05).
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