Space Station study links muscle wasting to mitochondrial decline
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Human cells cultured in microgravity on the International Space Station produced fewer mitochondrial proteins, a Nature study published July 16 found. The reduction may explain the muscle wasting and bone loss astronauts experience during long-duration spaceflight.
Mitochondrial Protein Drop
Researchers grew human muscle cells aboard the ISS for 30 days. Compared to ground controls, the space cells showed a 30% decrease in mitochondrial protein synthesis. Mitochondria are the cell's power plants; fewer proteins impair energy production.
Implications for Deep Space
The finding offers a cellular mechanism for the physiological decline seen in astronauts. Previous studies documented muscle loss of up to 20% after six months in orbit. Targeting mitochondrial pathways could lead to new countermeasures for Mars missions.
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