The space environment can significantly accelerate the aging of the body, and this is no longer just a hypothesis. An experiment recreating the conditions of interplanetary flight showed that within a single day, the same processes begin in the liver that normally unfold on Earth over years.
Laboratory Model of Deep Space
A team led by Professor Michal Masternak of the University of Central Florida created a laboratory environment close to the conditions of interplanetary flight. For fourteen days, animal models were kept under simulated microgravity while simultaneously receiving doses of galactic cosmic radiation and solar particles comparable to what a crew would experience during a journey to Mars.
The researchers chose the liver deliberately. This organ plays a central role in metabolism and is therefore highly sensitive to physiological stress, serving as an early indicator of broader changes in the body.
Genetic Changes Within a Day
Just twenty-four hours after irradiation, the liver showed a wave of genetic changes strikingly similar to those that accompany natural aging. Cellular senescence increased in the organ, meaning a state in which cells lose their normal function. At the same time, inflammation and fibrosis intensified.
If left unchecked, these processes can gradually lead to organ failure. In effect, within just a few days, the tissues developed changes that under Earth conditions usually take years to occur.
Confirmation by Real Data
The results of the laboratory experiment were compared with data from real space missions. For this, researchers used blood analyses from NASA’s well-known twin study involving Scott and Mark Kelly, as well as samples from participants in the civilian Inspiration4 mission. The genetic markers matched, Universe Today reports.
It was precisely this match between the laboratory model and the real biology of astronauts that convinced the team they had identified genuine biological targets rather than an experimental artifact.
First Steps Toward Protection
Michal Masternak’s team went further and identified a class of molecules called antagomirs. They can interact with the body’s microRNAs and influence genetic pathways associated with aging and inflammation. The work is still at an early stage, but it outlines a future in which crews on long-duration missions could receive targeted protection against accelerated cellular damage.
This same model of accelerated aging may also become valuable for medicine on Earth, since ordinary studies of age-related changes in humans require decades of observation, while space conditions compress this process into days and weeks, making it possible to test anti-aging therapies much faster.
Broader Significance for Medicine
Professor Michal Masternak emphasizes that aging is a far more complex process than external changes alone. He describes it as a gradual and cascading failure of many organs and systems at once. Understanding exactly where this cascade begins means moving closer to answering one of the key questions of modern medicine.
As crewed missions to the Moon and Mars draw nearer, studies like this are gaining dual importance. Michal Masternak and his colleagues already plan to expand the experiments to other organs and test whether antagomirs can slow the cascade of age-related changes not only in the liver.
