Every few seconds, your lungs expand and contract without you thinking about it. That rhythmic stretch happens in millions of microscopic air sacs, where oxygen slips into your blood and where invading bacteria try to establish a foothold. Recreating that motion in a lab has been nearly impossible—until now.
Researchers at the Francis Crick Institute and biotechnology company AlveoliX have built the first human lung-on-chip model where every single cell comes from one person. The device doesn’t just sit still under a microscope. Specialized machines pull and stretch a thin silicon membrane in three dimensions, mimicking the expansion and contraction of real breathing. That mechanical flexing coaxes the cells to grow tiny hair-like projections called microvilli, structures that increase surface area for gas exchange. The result is a vivid, microscopic landscape of air sac tissue that looks and behaves like the deepest parts of a human lung.
What makes this different from earlier lung chips is its genetic uniformity. Past models were cobbled together from cells donated by different people or pulled from commercial cell lines—genetic patchworks that couldn’t capture how one specific body might respond to disease. This time, scientists generated every component from a single donor’s stem cells: the epithelial cells lining the air sacs, the endothelial cells forming blood vessel walls, and the macrophages patrolling for invaders.
Tuberculosis Breaks Through in Five Days
To test whether this breathing chip could reveal hidden disease processes, the team introduced Mycobacterium tuberculosis, the bacterium behind TB. Tuberculosis is maddeningly slow in people, taking months before symptoms surface. By the time doctors see signs of infection, the earliest battle has long since played out.
Inside the chip, that battle became visible. Macrophages swarmed the bacteria and formed dense clusters. Within those clusters, necrotic cores developed—zones of dead immune cells surrounded by living ones, a hallmark of early TB pathology. Within five days, both the epithelial barrier protecting the air sacs and the endothelial lining of blood vessels collapsed entirely. The bacteria didn’t multiply explosively, but the immune response itself destroyed the lung’s architecture.
The researchers then engineered a version of the chip with a deliberate genetic flaw. They removed ATG14, a gene involved in autophagy, a cellular cleanup process. When they infected this modified chip with TB, the immune cells died faster even though bacterial numbers stayed the same. The blood vessel lining suffered worse damage. The gene, it turns out, doesn’t directly kill bacteria—it keeps our own cells alive during the fight.
“Composed of entirely genetically identical cells, the chips could be built from stem cells from people with particular genetic mutations. This would allow us to understand how infections like TB will impact an individual and test the effectiveness of treatments like antibiotics,” Maximiliano G. Gutierrez, principal group leader at the Crick, explains.
Why a Single Genetic Source Matters
Using cells from one donor transforms what these chips can reveal. Doctors could potentially take a patient’s stem cells, grow their lung on a chip, and screen which antibiotics work best for that person’s genetic makeup before prescribing anything. For diseases like TB that take months to show results in patients, that kind of precision could be life-saving.
The breathing motion itself proved crucial. Without the rhythmic stretch, the cells don’t develop microvilli or form proper barriers. It’s not enough to grow lung cells in a dish—they need the physical forces they’d experience inside a chest cavity to behave correctly.
The team isn’t stopping with tuberculosis. They’re adapting the system to study influenza, COVID-19, and lung cancer. By adding more cell types to the mix, they hope to build even more complete miniature lungs that could replace animal testing in early drug development. As non-animal technologies become more essential in research, these chips offer a way to study human lung biology directly rather than extrapolating from mice or other animals with different immune systems and lung structures.
The breakthrough is both mechanical and biological: a chip that breathes, built from a single person’s genetic blueprint, revealing disease processes that have remained invisible for as long as we’ve studied respiratory infections.
Science Advances: 10.1126/sciadv.aea9874
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