Journal
JOURNAL OF BIOLOGICAL CHEMISTRY
Volume 278, Issue 2, Pages 1248-1258Publisher
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M208419200
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Funding
- NHLBI NIH HHS [HL-60234, HL-55330] Funding Source: Medline
- NIAID NIH HHS [AI-42365] Funding Source: Medline
- NIDDK NIH HHS [DK-43135] Funding Source: Medline
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Carbon monoxide (CO), a reaction product of the cytoprotective gene heme oxygenase, has been shown to be protective against organ injury in a variety of models. One potential mechanism whereby CO affords cytoprotection is through its anti-apoptotic properties. Our studies show that low level, exogenous CO attenuates anoxiareoxygenation (A-R)-induced lung endothelial cell apoptosis. Exposure of primary rat pulmonary artery endothelial cells to minimal levels of CO inhibits apoptosis and enhances phospho-p38 mitogen-activated protein kinase (MAPK) activation in A-R. Transfection of p38alpha dominant negative mutant or inhibition of p38 MAPK activity with SB203580 ablates the anti-apoptotic effects of CO in A-R. CO, through p38 MAPK indirectly modulates caspase 3. Furthermore, we correlate our in vitro apoptosis model with an in vivo model of A-R by showing that CO can attenuate I-R injury of the lung. Taken together, our data are the first to demonstrate in models of A-R that the anti-apoptotic effects of CO are via modulation of p38 MAPK and caspase 3.
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