Spaceflight Altered DNA and RNA Levels in Rat Immune Organs

This 1982 study looked at how spaceflight affects genetic material in the body's tissues, not at skincare or wound healing. Misŭrova and colleagues, writing in Kosmicheskaia biologiia i aviakosmicheskaia meditsina, measured levels of polydeoxyribonucleotides (chains of DNA building blocks) and nucleic acids (DNA and RNA) in the spleen, thymus, liver, bone marrow and blood of rats that spent 18.5 days aboard the Cosmos-1129 biosatellite.

The animal experiment found that the polydeoxyribonucleotide content rose in the thymus, an organ central to immune function, while DNA and RNA concentrations fell in both the spleen and thymus. By six days after landing, these changes had returned to normal levels, suggesting the effects were temporary.

The abstract gives no numeric values, no comparison group details beyond the implied control, and no explanation of mechanism. As a short, decades-old abstract without methodological detail, it cannot tell us whether these molecular shifts had any functional consequence for the animals, nor whether similar effects would occur in other species or under different stress conditions.