Simulated microgravity induced damage in human retinal pigment epithelial cells
Joan E Roberts1, Barbara M Kukielczak, Colin F Chignell
1Department of Natural Sciences, Fordham University, New York, NY 10023, USA. jroberts@fordham.edu
Molecular Vision
|June 9, 2006
Summary
Spaceflight’s simulated microgravity causes DNA damage and inflammation in retinal cells. Cysteine pretreatment reduced this damage, suggesting a potential treatment for astronauts to prevent vision loss.
Area of Science:
- Ophthalmology
- Space Medicine
- Cell Biology
Background:
- Spaceflight poses risks to astronaut health, including potential ocular damage.
- Understanding the effects of microgravity on the retina is crucial for long-duration missions.
Purpose of the Study:
- To investigate the impact of simulated microgravity on human retinal pigment epithelial (hRPE) cells.
- To assess DNA damage and inflammatory responses in retinal cells under microgravity conditions.
Main Methods:
- hRPE cells were cultured in a NASA-designed rotating wall bioreactor to simulate microgravity.
- DNA damage was quantified using the comet assay.
- Prostaglandin E2 (PGE2) production, an inflammatory marker, was measured post-exposure.
Main Results:
- Simulated microgravity induced unrepaired single-stranded DNA breaks in hRPE cells.
- A significant increase in PGE2 production indicated an inflammatory response.
- Cysteine pretreatment mitigated DNA damage and suppressed PGE2 release.
Conclusions:
- Microgravity induces retinal cell inflammation and DNA damage, establishing a novel in vitro model.
- This model can be used to test anti-inflammatory therapies for retinal conditions.
- Cysteine may serve as a prophylactic treatment to prevent vision impairment in astronauts.