Agnirva Space Premier League - Expedition #31441: How Spaceflight Affects T Cells: Exploring Immune Memory in Microgravity

Our immune system relies on T cells to recognize and fight infections. But what happens when these cells develop in space? Dr. Millie Hughes-Fulford and her team at UCSF aimed to answer this question through an ISS experiment focused on CD4+ T cells, a crucial part of the adaptive immune system.

This experiment studied how spaceflight affects T cell priming and memory—processes that allow the immune system to 'remember' past invaders. The team found that microgravity alters how these cells become activated and form long-lasting immunity. Mice flown to the ISS were used to study antigen-specific T cell responses.

The results showed that in space, T cells struggle to activate properly, potentially reducing the effectiveness of vaccines and the body's response to infections. This research is key to understanding how long-duration space travel might impair immune function—and what countermeasures could keep astronauts healthy during deep space missions.

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