Exposure to space radiation triggers rapid genetic changes in the liver that mirror the biological processes of human aging, according to research published in GeroScience. By studying these accelerated markers, scientists aim to develop targeted therapies that could protect astronauts on long-duration missions and potentially address age-related diseases on Earth.
How does space travel accelerate the aging process?
Space environment exposure forces the body to undergo biological shifts at an accelerated pace, according to Masternak, a professor of medicine leading aging and space medicine research at the College of Medicine. His team observed that just 24 hours after radiation exposure, the liver—a key metabolic organ—exhibited genetic changes remarkably similar to those seen during natural aging.
These changes include increased cellular senescence, where cells stop dividing and lose function, alongside rising levels of inflammation and fibrosis. Left unaddressed, these cellular shifts can result in declining organ function. The research team validated these findings by comparing them with blood data from the NASA Twins Study and Inspiration4 mission participants, confirming that similar genetic signatures appear in human blood samples during spaceflight.
Researchers are testing “antagomirs,” a group of molecules that interact with the body’s microRNA to potentially block the genetic pathways responsible for inflammation and aging in space.
Why is the liver a focal point for space medicine?
The liver serves as a primary site for metabolic activity, making it an ideal focus for researchers. Masternak notes that because aging is a complex, cascading failure of multiple systems, the liver provides a window into where these processes begin. By identifying the molecular triggers in the liver, scientists hope to intervene before these systemic failures develop into chronic diseases.
This research offers a unique advantage: speed. On Earth, studying human aging takes decades. In space, the accelerated nature of these biological changes allows researchers to observe and understand aging processes faster, providing actionable data that would otherwise be inaccessible.
How are students contributing to space medicine?
The next generation of scientists is already integrating space medicine into clinical research. Md Tanjim Alam, a biomedical sciences Ph.D. student, transitioned from studying cancer biology to space medicine after processing samples from commercial space travelers. His work focuses on how extreme environments influence human health at a molecular level.
Similarly, Sarah S. Siddiqi, a biotechnology graduate student, emphasizes that this field shifts the focus of aging research. “When people think of aging, they think only about elderly populations,” Siddiqi says. Her work examines aging across different life stages and environments, aiming to identify disease markers earlier.
Frequently Asked Questions
Can space-related aging be reversed?
Researchers are currently investigating “antagomirs,” which are molecules capable of altering inflammatory genetic pathways. The goal is to use these to protect cells from the damaging effects of space radiation.
Is this research only for astronauts?
No. While the immediate goal is to protect space travelers, the findings provide insights into the fundamental mechanisms of human aging, which may lead to new therapies for age-related conditions on Earth.
How does the liver react to radiation?
Within 24 hours of exposure, the liver shows signs of cellular senescence, inflammation, and fibrosis—the same biological markers associated with the gradual decline of organ function during aging.
Follow the latest updates from the College of Medicine’s research labs to see how breakthroughs in space medicine are being translated into clinical applications for terrestrial healthcare.
This research was supported by the National Science Foundation (Award FAIN: 2317758), the Ed and Ethel Moore Alzheimer’s Disease Research Program, and the National Science Centre, Poland (UMO-2023/51/B/NZ5/00498).
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