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Redox survival signalling in retina-derived 661W cells
A M Mackey1, N Sanvicens, G Groeger
1Laboratory of Cell Development and Disease, Department of Biochemistry, Bioscience Research Institute, University College Cork, Cork, Ireland.
Cell Death and Differentiation
|April 12, 2008
Summary
Hydrogen peroxide (H2O2) acts as a pro-survival signal in retinal cells, rapidly activating AKT pathways to prevent cell death from apoptotic stimuli. Inhibiting this oxidant burst worsened cell death, confirming its protective role.
Area of Science:
- Cellular Biology
- Neuroscience
- Ophthalmology
Background:
- Reactive oxygen species (ROS) are linked to cellular damage and death, particularly in the eye.
- Oxidant species can also function as intracellular signaling molecules promoting cell survival.
- The role of ROS in retinal cell survival is not well understood.
Purpose of the Study:
- To investigate the role of hydrogen peroxide (H2O2) as a pro-survival signal in retinal cells.
- To elucidate the signaling pathways involved in H2O2-mediated retinal cell survival.
- To determine the impact of H2O2 signaling on apoptotic stimuli in the retina.
Main Methods:
- Utilized retina-derived 661W cells and RGC-5 cell lines.
- Investigated pro-survival and pro-death pathways under apoptotic stimuli (e.g., serum deprivation).
- Manipulated H2O2 levels (inhibition and exogenous application) to assess its effect on cell survival.
Main Results:
- Demonstrated rapid, transient generation of H2O2 in response to apoptotic stimuli in retinal cells.
- Showed that H2O2 activates the AKT survival pathway.
- Found that inhibiting the H2O2 burst exacerbated cell death, while exogenous H2O2 enhanced survival.
Conclusions:
- Hydrogen peroxide (H2O2) acts as a novel pro-survival signal in retinal cells.
- H2O2 mediates retinal cell survival by activating the AKT pathway in response to apoptotic stimuli.
- Understanding this mechanism offers potential therapeutic targets for retinal diseases.
