Abstract |
Reactive oxygen or nitrogen species (ROS/RNS) generated endogenously or in response to environmental stress have long been implicated in tissue injury in the context of a variety of disease states. ROS/RNS can cause cell death by nonphysiological (necrotic) or regulated pathways (apoptotic). The mechanisms by which ROS/RNS cause or regulate apoptosis typically include receptor activation, caspase activation, Bcl-2 family proteins, and mitochondrial dysfunction. Various protein kinase activities, including mitogen-activated protein kinases, protein kinases-B/C, inhibitor-of-I-kappaB kinases, and their corresponding phosphatases modulate the apoptotic program depending on cellular context. Recently, lipid-derived mediators have emerged as potential intermediates in the apoptosis pathway triggered by oxidants. Cell death mechanisms have been studied across a broad spectrum of models of oxidative stress, including H2O2, nitric oxide and derivatives, endotoxin-induced inflammation, photodynamic therapy, ultraviolet-A and ionizing radiations, and cigarette smoke. Additionally ROS generated in the lung and other organs as the result of high oxygen therapy or ischemia/reperfusion can stimulate cell death pathways associated with tissue damage. Cells have evolved numerous survival pathways to counter proapoptotic stimuli, which include activation of stress-related protein responses. Among these, the heme oxygenase-1/ carbon monoxide system has emerged as a major intracellular antiapoptotic mechanism.
|
Authors | Stefan W Ryter, Hong Pyo Kim, Alexander Hoetzel, Jeong W Park, Kiichi Nakahira, Xue Wang, Augustine M K Choi |
Journal | Antioxidants & redox signaling
(Antioxid Redox Signal)
Vol. 9
Issue 1
Pg. 49-89
(Jan 2007)
ISSN: 1523-0864 [Print] United States |
PMID | 17115887
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't, Review)
|
Chemical References |
- Reactive Nitrogen Species
- Reactive Oxygen Species
- Carbon Monoxide
- Heme Oxygenase-1
|
Topics |
- Animals
- Apoptosis
- Carbon Monoxide
(metabolism, physiology)
- Cell Death
- Heme Oxygenase-1
(metabolism, physiology)
- Humans
- Models, Biological
- Oxidative Stress
- Photochemotherapy
- Radiation
- Reactive Nitrogen Species
(metabolism)
- Reactive Oxygen Species
(metabolism)
- Reperfusion Injury
(metabolism)
|