Space travel can alter gene expression in white blood cells, weakening our immune system

Exposure to microgravity causes changes to the human immune system:

"Here we show that the expression of many genes related to immune functions rapidly decreases when astronauts reach space, while the opposite happens when they return to Earth after six months aboard the ISS," said Dr. Odette Laneuville, an associate professor at the Department of Biology of the University of Ottawa, leading author of a new study in Frontiers in Immunology.

doi: https://dx.doi.org/10.3389/fimmu.2023.1171103