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Spaceflight Accelerates Human Stem Cell Aging, Researchers Find

The study found spaceflight causes blood stem cells to age faster by accumulating DNA damage and losing regenerative function, posing risks for long-term astronaut health, researchers said.

Summary by Phys.org
Researchers from the University of California San Diego Sanford Stem Cell Institute have discovered that spaceflight accelerates the aging of human hematopoietic stem and progenitor cells (HSPCs), which are vital for blood and immune system health.

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A study led by the University of California in San Diego, United States, found that space flights accelerate the aging of human stem cells and hematopoietic progenitors, which are vital to the health of blood and the immune system. According to the results, stem cells lost part of their ability to produce new healthy cells, became more prone to DNA damage, and showed signs of faster aging at the ends of their chromosomes after space flight, all …

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Phys.org broke the news in United Kingdom on Thursday, September 4, 2025.
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