Jenny Lehmann of Discover Magazine reports that Chinese researchers have developed a swallowable, bacteria-powered diagnostic pill that could one day replace invasive colonoscopies. The capsule contains engineered bacteria that detect gastrointestinal bleeding—an indicator of diseases like colitis—and emit a measurable glow once excreted. Encased in a protective hydrogel and embedded with magnetic particles for easy retrieval, the sensors accurately reflected disease severity in mouse models without causing side effects. The team says this fast, noninvasive, glow-based system could eventually help diagnose, monitor, and guide treatment for a range of gut disorders, pending future human trials. Lehmann writes:
There are many things people would rather endure than a colonoscopy. But when it comes to gut health, taking this physical approach by literally looking inside the intestines is still the established method. How great would it be if we could instead swallow a tiny pill that travels through our bowels, collects the information doctors need, and exits our bodies without us even noticing?
That’s exactly what a team of Chinese researchers has developed: a small sensor-in-a-pill that combines the power of bacteria and magnetism to create a less invasive but highly sensitive diagnostic tool for colitis. By reacting to gastrointestinal bleeding and producing a glow detectable later, bacteria once again show how surprisingly resourceful they can be in medical diagnostics. […]
To test the novel system, the team administered the bacterial sensors to mice showing different stages of colon inflammation (colitis). After the pill traveled through the gut and was excreted, it took only about 25 minutes to retrieve the microspheres from feces and measure their glowing signal, a huge improvement over the several hours it would take without encapsulation.
The results were striking: the light intensity increased in line with disease severity. In other words, the stronger the glow, the more blood was present, and the more advanced the colitis. […]
Human trials will be the next essential step, but the initial findings are promising. Beyond early diagnosis, the system could one day help guide treatment and track disease progression with a tool that’s fast, noninvasive, and unexpectedly powered by glowing bacteria.
Read more here.