Key Takeaways
- Biochemists at UW–Madison studied phage-bacteria interactions in microgravity to understand their impact on the gut microbiome and potential treatments for antibiotic-resistant infections.
- Experiments conducted on the International Space Station revealed novel mutations in phages and bacteria, differing from those observed on Earth.
- The findings suggested that space conditions may mimic stressors faced by bacteria, offering new insights for developing effective phage therapies against infections such as urinary tract infections (UTIs).
In September 2020, researchers from the University of Wisconsin–Madison launched a small box containing bacteria and phages (viruses that infect bacteria) into space. This experiment aimed to investigate how these microorganisms behave under unique space conditions, particularly concerning the gut microbiome and addressing antibiotic resistance on Earth. The research results were published in the journal PLOS Biology.
Vatsan Raman, a biochemistry professor leading the project, highlighted the significance of the research, stating, “Our experiment was about more than learning what happens when bacteria and phages travel in outer space. We are asking questions about how mutations acquired in space might be relevant on Earth.” The interactions between bacteria and phages are crucial for maintaining a healthy gut microbiome, where bacteria evolve to resist infection, prompting phages to adapt accordingly.
As space travel becomes more common, understanding the effects of microgravity on microbial evolution is increasingly important. Sustained microgravity is challenging to simulate on Earth, making the International Space Station (ISS) an ideal setting for this research. Philip Huss, a postdoctoral researcher and lead author, noted the need to explore how phages interact with bacteria in microgravity, as these conditions differ significantly from those on Earth.
The team partnered with Rhodium Scientific to ensure that the samples met safety standards for space travel. Over a 25-day period aboard the ISS, various combinations of bacteria and phages were incubated, and similar experiments were conducted on Earth for comparison.
Upon analyzing the results, researchers discovered key differences between the samples grown in space and those grown on Earth. Notably, the bacterial surface proteins and the phages mutated in novel ways, allowing for unique interactions not typically observed on Earth. This raised the question of how these mutations could inform phage therapies aimed at addressing bacterial infections.
The lab then tested the engineered phages against pathogens responsible for urinary tract infections, finding that these novel combinations were surprisingly effective. Raman expressed wonder at the outcomes, suggesting, “One of our hypotheses is that the environmental factors stressing UTI bacteria somehow mimic the stress bacteria experience in microgravity, making their surface proteins similar.” Currently, over 90% of UTI-causing bacteria are resistant to at least one antibiotic, emphasizing the urgency for new treatments.
Building on the knowledge gained from this first experiment, the team plans to conduct more complex studies in future space flights, examining how various phages and bacteria interact in conditions that mirror the human microbiome. Huss remarked on their progress, stating, “Now, we’re ready to study systems of multiple phages and bacteria that more closely represent the complexity of the human microbiome. What novel interactions occur in space, and what can we learn from them here on Earth?”
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