Scientists find spaceflight affects immune genes, deforms brain, Pg10

Key Highlights:

• A study published in Science on January 2 revealed that the space environment significantly altered the gene expression of human immune cells, impacting heart function, the nervous system, and senses.
• Research published on January 12 in Proceedings of the National Academy of Sciences analyzed MRI scans of 26 astronauts, finding that different brain regions move and deform differently during spaceflight.
• Genes related to DNA repair and cell division became less effective in space, signaling potential long-term health risks for astronauts.
• The supplementary motor cortex in astronauts who spent a year in space shifted 2.52 mm upwards.

Detailed Insights:

• The January 2 study examined human immune cells (THP-1 monocytes) sent to the International Space Station, discovering that genes related to heart function, the nervous system, and senses became overactive, potentially explaining astronaut health issues.
• The January 12 study compared MRI scans of astronauts before and after missions to a control group undergoing a head-down tilt bed rest study to mimic weightlessness.
• Brain regions handling movement and sensation experienced the most significant shifts during spaceflight, with the degree of posterior insula shift correlating with balance test performance post-mission.
• Limitations of the brain study included a limited sample size, inability to capture changes within specific brain regions, varied post-mission testing times, and the tilt test's incomplete replication of microgravity's effects on the brain.
• These studies highlight the need to understand the effects of microgravity and radiation on astronauts' health as humans prepare for longer missions to the moon and Mars.

Scientific/Technical Concepts Involved:

• Gene Expression: The process by which information from a gene is used in the synthesis of a functional gene product, such as a protein.
• Microgravity: The condition of experiencing very little or no gravitational force.
• MRI (Magnetic Resonance Imaging): A medical imaging technique that uses magnetic fields and radio waves to create detailed images of the organs and tissues in the body.