Study finds that 30 percent of astronauts returning from two-week space shuttle missions were found to be suffering from eye problems. It also found that 60 percent who spent six months aboard the International Space Station also suffered the same problems.
Mice were flown aboard shuttle flights STS-133 in March 2011 and STS-135 in July 2011 as part of the Commercial Biomedical Testing Module-2 (CBTM-2) and CBTM-3 investigations into how space affects muscle and bones.
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These sets of mice found second life, contributing to other studies through a tissue-sharing program.
Two studies used eye tissue from the mice to provide the first direct evidence that spaceflight causes cellular-level damage that has the potential to cause long-term vision problems.
![Watery Eyes]( "Watery Eyes")
Excess tearing may cause a sensation of watery eyes or result in tears falling down the cheek. Obstruction of tear drainage path can lead to stasis and is also a reason for watery eyes.
Susana Zanello, Universities Space Research Association scientist at NASA's Johnson Space Center in Houston, examined eye tissue for changes in gene expression in the retina-the sensory tissue at the back of the eye.
Results from a study of mice from the second flight were detailed by Xiao W. Mao, MD, a researcher in the Division of Radiation Research at Loma Linda University and Medical Center in California, and her colleagues in "Spaceflight Environment Induces Mitochondrial Oxidative Damage in Ocular Tissue.
Both studies implicated oxidative stress in eye damage. Spaceflight exposes astronauts - and mice - to radiation, hypothermia, hypoxia and variations in gravity, all of which may play roles in tissue injury, and, in particular, oxidative stress.
In the STS-133 samples, Zanello found increased expression of genes involved in response to oxidative stress in retina tissue. "We saw this effect immediately after landing, which means it was a defensive increase in response to oxidative stress," she said.
Also notable was that a week after spaceflight, the response had decreased, indicating that the damage may be reversible. "That opens the door to the possibility of countermeasures, such as nutritional anti-oxidants," Zanello said.
The studies have been published in journal Gravitational and Space Research and in journal Radiation Research.
Source: ANI
Watery Eyes
Excess tearing may cause a sensation of watery eyes or result in tears falling down the cheek. Obstruction of tear drainage path can lead to stasis and is also a reason for watery eyes.
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Susana Zanello, Universities Space Research Association scientist at NASA's Johnson Space Center in Houston, examined eye tissue for changes in gene expression in the retina-the sensory tissue at the back of the eye.
Results from a study of mice from the second flight were detailed by Xiao W. Mao, MD, a researcher in the Division of Radiation Research at Loma Linda University and Medical Center in California, and her colleagues in "Spaceflight Environment Induces Mitochondrial Oxidative Damage in Ocular Tissue.
Both studies implicated oxidative stress in eye damage. Spaceflight exposes astronauts - and mice - to radiation, hypothermia, hypoxia and variations in gravity, all of which may play roles in tissue injury, and, in particular, oxidative stress.
In the STS-133 samples, Zanello found increased expression of genes involved in response to oxidative stress in retina tissue. "We saw this effect immediately after landing, which means it was a defensive increase in response to oxidative stress," she said.
Also notable was that a week after spaceflight, the response had decreased, indicating that the damage may be reversible. "That opens the door to the possibility of countermeasures, such as nutritional anti-oxidants," Zanello said.
The studies have been published in journal Gravitational and Space Research and in journal Radiation Research.
Source: ANI
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Researchers worldwide have discovered that eating fish regularly is good for health. Regular consumption of fish may reduce the risk of diseases such as asthma, prostate cancer and eyesight.
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