Journal
JOURNAL OF CELL BIOLOGY
Volume 170, Issue 7, Pages 1079-1090Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1083/jcb.200505022
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Funding
- NHLBI NIH HHS [HL-60290] Funding Source: Medline
- NIDDK NIH HHS [R01 DK034804, DK-34804] Funding Source: Medline
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Reactive oxygen species (ROS) play a divergent role in both cell survival and cell death during ischemia/reperfusion (I/R) injury and associated inflammation. In this study, ROS generation by activated macrophages evoked an intracellular Ca2+ ([Ca2+](i)) transient in endothelial cells that was ablated by a combination of superoxide dismutase and an anion channel blocker. [Ca2+](i) store depletion, but not extracellular Ca2+ chelation, prevented [Ca2+](i) elevation in response to O-2(.-) that was inositol 1,4,5- trisphosphate (InsP(3)) dependent, and cells lacking the three InsP(3) receptor (InsP(3)R) isoforms failed to display the [Ca2+](i) transient. Importantly, the O-2(.-)-triggered Ca2+ mobilization preceded a loss in mitochondrial membrane potential that was independent of other oxidants and mitochondrially derived ROS. Activation of apoptosis occurred selectively in response to O-2(.-) and could be prevented by [Ca2+](i) buffering. This study provides evidence that O-2(.-) facilitates an InsP(3)R-linked apoptotic cascade and may serve a critical function in I/R injury and inflammation.
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