Researchers Discover Challenges in Using Tardigrade Protein for Space Radiation Protection

Research on the potential use of a protein from tardigrades to protect astronauts from cosmic radiation has revealed significant challenges. A team led by Corey Nislow at the University of British Columbia found that while the protein, known as Dsup (damage suppressor), provides considerable protection against various mutation-inducing agents, it also poses risks to cellular health.

Tardigrades, tiny creatures renowned for their resilience to extreme environments, have captured scientific interest due to their ability to survive harsh conditions, including radiation and the vacuum of space. In 2016, researchers identified Dsup as a critical factor in their survival capabilities. When human cells were genetically engineered to produce this protein, they demonstrated increased resistance to radiation without observable negative effects. This sparked the idea of using Dsup to shield astronauts from harmful cosmic rays during space missions.

However, Nislow’s recent studies on yeast cells modified to produce Dsup illuminated a more complex picture. While Dsup can effectively protect DNA by enveloping it, high concentrations of the protein can be detrimental to cell viability. His team discovered that excessive levels of Dsup could be fatal, and even lower levels hampered cell growth. As Nislow explained, “There’s a cost for every benefit that we’ve seen.”

In exploring how Dsup functions, researchers noted that its protective mechanism interferes with essential cellular processes. The protein’s presence can inhibit the access of other vital proteins needed for DNA replication and repair, leading to potential cellular damage.

James Byrne from the University of Iowa emphasized the need for a targeted approach. His research considers whether Dsup could aid healthy cells during radiation therapy for cancer. He asserted that continuous production of Dsup in all human cells could adversely affect health, but temporary production during critical periods might yield benefits.

Other scientists are also investigating Dsup’s potential. Simon Galas from the University of Montpellier pointed out that low levels of Dsup have been shown to extend the lifespan of nematode worms by protecting against oxidative stress. He acknowledged that further research is necessary to fully understand the protein’s effects.

In parallel, Jessica Tyler at Weill Cornell Medicine has also conducted experiments with yeast modified to produce Dsup. Her findings indicate that lower concentrations than those tested by Nislow appear to have beneficial effects without hindering growth. Tyler commented, “I do not agree that the protection provided by Dsup comes at a significant cost,” while also agreeing on the importance of maintaining appropriate levels of the protein.

The quest for effective methods to harness Dsup’s protective qualities continues, with Nislow expressing optimism about advancements in delivery systems. “There’s so much money and attention on delivery systems,” he stated. “It’s a problem that so many people in pharma are motivated to solve.”

As researchers delve deeper into the complexities of Dsup, the potential for its application in protecting astronauts and other organisms from radiation remains a tantalizing prospect, albeit one that requires careful consideration of the trade-offs involved.