Evidence of spaceflight-induced adverse effects on photoreceptors and retinal function in the mouse eye.

This research study aimed to understand how space travel affects eye health, specifically looking at the retina and vision in mice. The scientists sent ten-week-old male mice into space for a month onboard the International Space Station (ISS). They wanted to see if being in space would cause changes similar to those experienced by astronauts when they return home-a condition known as "spaceflight-associated neuro-ocular syndrome" or SANS. To help protect against these potential eye problems, the mice were given an antioxidant treatment before and during their space journey to reduce damage from harmful molecules called reactive oxygen species (ROS). ROS can cause cell damage in our eyes when they build up too much-something that might happen more easily in space. After returning safely back to Earth, the researchers studied how well these mice could see and checked their retinas for any signs of disease or changes caused by being in space. They compared this data with a control group of mice who stayed on Earth under similar conditions as much as possible (but obviously without going into space).

This research paper investigates retinal function and oxidative stress in adult C57BL/6 male mice following exposure to microgravity conditions aboard the International Space Station (ISS) for a duration of 35 days. The study aimed at understanding spaceflight-induced neuro-ocular syndrome (SANS), which can lead to long-term visual impairments in astronauts, by examining retinal changes and assessing the efficacy of an antioxidant treatment using a superoxide dismutase mimic. Methodology: Ten C57BL/6 male mice were flown on SpaceX 24 to ISS for ten weeks (35 days). Prior to launch, all animals received weekly injections of MnTnBuOE-2-PyP 5+ (BuOE), a superoxide dismutase mimic. Ground control groups were maintained on Earth under identical environmental conditions without spaceflight exposure and antioxidant treatment for the same duration as their counterparts in orbit to serve as comparative controls.