期刊
JOURNAL OF MOLECULAR AND CELLULAR CARDIOLOGY
卷 51, 期 2, 页码 244-251出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.yjmcc.2011.05.003
关键词
Caspase-1; Cell death; Inflammation; NEW-Myocardial infarction; NEW-Remodeling
资金
- American Heart Association
- NIH [AI-15614]
- Juvenile Diabetes Research Foundation [2-2007-103]
- Israel Scientific Foundation [1027/07]
- [KL2RR031989-01]
Alpha-1-antitrypsin (AAT) possesses anti-inflammatory and tissue-protective properties. Here, we studied the effects of exogenously administered AAT on caspase-1 activity and on the outcome of ischemia-reperfusion injury (I/R) in a mouse model of acute myocardial infarction (AM!). Adult male mice underwent 30 min of coronary artery ligation followed by reperfusion and were randomly assigned to receive clinical-grade AAT or albumin at reperfusion. Infarct size was evaluated after 1 and 7 days. Caspase-1 activity was measured in homogenates of heart tissue. Left ventricular (LV) end-diastolic diameter (EDD) and end-systolic diameter (ESD) were measured and LV fractional shortening (FS) and ejection fraction (EF) were calculated using transthoracic echocardiography. The effect of AAT on caspase-1 activity was determined in cultures of mouse HL-1 cardiomyocytes stimulated with LPS and triggered with nigericin or when HL-1 cells were exposed to simulated ischemia. AAT-treated mice had significantly smaller infarct sizes (-30% day 1 and -55%day 7) compared with mice treated with albumin. AAT treatment resulted in >90% reduction in caspase-1 activity in homogenates of hearts 24 h after I/R. Seven days after AMI. AAT-treated mice exhibited a >90% smaller increase in LVEDD and LVESD and smaller reduction in LVEF. The increase in caspase-1 activity in HL-1 cells induced by LPS and nigericin or following exposure to simulated ischemia was reduced by >80% and AAT similarly reduced cell death by >50%. In conclusion, exogenous administration of clinical grade AAT reduces caspase-1 activity in the ischemic myocardium leading to preservation of viable myocardium and prevention of adverse cardiac remodeling. (C) 2011 Elsevier Ltd. All rights reserved.
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