Evaluating ocular response in the retina and optic nerve head after single and fractionated high-energy protons

This research paper explores how exposure to space radiation could affect astronauts' health during long missions on the moon and Mars. Scientists used mice as a model for humans because they share many biological similarities, which helps them understand potential human responses better. They found that when these young male mice were exposed to high-energy particles from outer space (similar to what astronauts might encounter), it caused damage in their eyes and brains-specifically affecting the retina, optic nerve head, blood vessels of the eye's surface layer, a protein called 4-HNE that can harm cells when present at high levels, water channels essential for cell function (AQP-4), an immune system molec01 and communication between endothelial cells lining blood vessels. The study suggests these damages could lead to vision problems or even blindness in astronauts on long space missions due to the continuous exposure to cosmic rays, which are a mix of particles from outer space that can be harmful when absorbed by living tissues.

This research paper investigates the effects of space radiation on biomarkers in retinal and optic nerve head (ONH) tissues using a fractionated irradiation approach with single-event upset (SEU)-sensitive assays. The study utilized six-month-old C57BL/6 male mice as the model organism, which were either sham-irradiated or subjected to whole-body exposure using a proton beam in an irradiation facility at Loma Linda University (LLU). The key findings of this study revealed that radiation exposure led to significant damage and alterations in biomarkers within the retina, ONH tissue, and blood vessels. The fractionated doses resulted in a dose-dependent increase in single "fractionated" Single$< fractionated" 4-HNE (hydroxynonenal) levels, indicating oxidative stress induced by radiation exposure.