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Alpha-1 antitrypsin inhibits caspase-1 and protects from acute myocardial ischemia–reperfusion injury
- Source :
-
Journal of Molecular & Cellular Cardiology . Aug2011, Vol. 51 Issue 2, p244-251. 8p. - Publication Year :
- 2011
-
Abstract
- Abstract: 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 (AMI). Adult male mice underwent 30min 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 7days. 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 24h 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. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00222828
- Volume :
- 51
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Journal of Molecular & Cellular Cardiology
- Publication Type :
- Academic Journal
- Accession number :
- 61918096
- Full Text :
- https://doi.org/10.1016/j.yjmcc.2011.05.003