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Am J Physiol Lung Cell Mol Physiol (January 18, 2008). doi:10.1152/ajplung.00262.2007
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Submitted on July 6, 2007
Accepted on January 14, 2008

Acute Lung Injury and Cell Death: How Many Ways Can Cells Die?

Peter Shih-Yi Tang1, Marco Mura2, Rashmi Seth2, and Mingyao Liu2*

1 Institute of Medical Science, University of Toronto, Toronto, Canada
2 Surgery, University of Toronto, Toronto, Canada

* To whom correspondence should be addressed. E-mail: mingyao.liu{at}utoronto.ca.

Apoptosis has been considered as an underlying mechanism in acute lung injury/acute respiratory distress syndrome and multi-organ dysfunction syndrome. Recently, several alternative pathways for cell death (such as caspase-independent cell death, oncosis, and autophagy) have been discovered. Evidence of these pathways in the pathogenesis of acute lung injury has also come into light. In this article, we briefly introduce cell death pathways, and then focus on studies related to lung injury. The different types of cell death that occur and the underlying mechanisms utilized depend on both experimental and clinical conditions. Lipopolysaccharide-induced acute lung injury is associated with apoptosis via Fas/Fas ligand mechanisms. Hyperoxia and ischemia-reperfusion injury generate reactive oxidative species, which induce complex cell death patterns composed of apoptosis, oncosis, and necrosis. Prolonged over-expression of inflammatory mediators results in increased production and activation of proteases, especially cathepsins. Activation and resistance to death of neutrophils also plays an important role in promoting parenchymal cell death. Knowledge of the co-existing multiple cell death pathways and awareness of the pharmacological inhibitors targeting different proteases critical to cell death, may lead to the development of novel therapies for acute lung injury.




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