NASA runs DNA, health tests on ISS

The International Space Station is doing two kinds of medicine at once. One track looks tiny — DNA-like materials that might help build better cancer drugs. The other looks very human — what long missions do to astronauts’ eyes, hearts, and mental state. On May 8, NASA said Expedition 74 spent the week working across both tracks, which is the real story here: the ISS is acting as both a biotech lab and a crew health clinic. ### What actually happened this week? NASA’s latest station update said the crew closed out the week with DNA-mimicking materials research, eye exams, heart studies, and psychology work. The named astronauts in the U.S. segment included Jessica Meir, Jack Hathaway, and Chris Williams, with ESA astronaut Sophie Adenot also involved in some of the science work. This was part of Expedition 74’s regular research schedule, not a one-off stunt. (nasa.gov) ### What is the DNA experiment? The key payload is DNA Nano Therapeutics-3. Chris Williams and Sophie Adenot processed samples for it in the Kibo lab on April 22, and NASA said the experiment is testing DNA-inspired assembly techniques as a way to manufacture nano-therapies — including treatments in the chemotherapy and immunotherapy family — that could kill cancer cells and help activate the immune system. Samples get checked on station with a spectrophotometer, then sent back to Earth for deeper analysis. (nasa.gov) ### Why do this in space? Microgravity changes how materials assemble and how cells behave. That sounds abstract, but it matters because gravity on Earth constantly stirs fluids, pulls particles downward, and can mask delicate interactions. NASA has said the ISS gives cancer researchers a cleaner way to study 3D cell growth, gene expression, signaling, and protein crystal formation — all things that can shape how tumors grow and how drugs bind to targets. (nasa.gov) ### What do the eye tests look for? Spaceflight can change vision and eye structure, especially on longer missions. In the May 8 update, NASA highlighted real-time eye exams where doctors on the ground monitored an astronaut’s retina, lens, and cornea using optical coherence tomography hardware. Basically, they are looking for the kinds of changes that have shown up before in orbit and that matter a lot more if you want crews traveling far beyond low Earth orbit. (nasa.gov) ### What about the heart studies? NASA’s April 23 update filled in that side of the story. Jessica Meir processed samples involving heart stem cells and pneumonia-causing bacteria, with the goal of understanding how infectious disease can damage heart tissue in microgravity. Roscosmos cosmonauts also ran a separate heart experiment using chest and limb sensors to measure cardiac bioelectric activity in weightlessness. One study looks cellular. The other looks whole-body. (nasa.gov) Together they map how space changes cardiovascular function. ### Why mention psychology too? Because long missions are not just a bones-and-muscles problem. NASA’s May 8 post grouped psychology with the eye and heart investigations, which fits the agency’s broader human research approach: if astronauts are going to spend months or years away from Earth, mission planners need data on cognition, stress, behavior, and team function alongside the biology. The body and mind are part of the same system up there. (nasa.gov) ### Is this part of a bigger NASA push? Yes — and the cancer angle is bigger than one station week. NASA has tied some of its cancer work to the federal Cancer Moonshot, and it has been building orbital DNA capability for years. The ISS has already hosted in-space PCR, DNA sequencing, microbe identification, and even CRISPR gene editing. So this week’s work sits on top of a long effort to turn orbit into a usable molecular biology lab, not just a place to observe astronauts floating around. (nasa.gov) ### Bottom line? The ISS is useful here because it lets NASA test both the machinery of disease and the machinery of the human body in the same place. The cancer experiment could sharpen future drug design. The eye, heart, and psychology studies could make long-duration missions safer. And the overlap is the point — the same station that stresses the body also helps scientists learn how to protect it. (nasa.gov 1) (nasa.gov 2)