When Ulf Ahlgren and his team at Umeå University created the first complete three-dimensional map of an entire human pancreas from a person living with type 1 diabetes, they glimpsed something the field had been missing for decades: insulin-producing cells are far more resilient than anyone realized.
The discovery reframes a disease that has long been understood as straightforward cellular destruction. Type 1 diabetes has typically been portrayed as the body's immune system systematically eliminating the insulin-producing beta cells clustered in structures called islets of Langerhans. But Ahlgren's research, published in Science Advances, reveals a more nuanced reality. Even in late-onset type 1 diabetes, when islet structures have been largely stripped of beta cells, hundreds of thousands of insulin-producing cells persist throughout the pancreas—most of them hiding outside the islets entirely, scattered as individual cells or small clusters in regions never before systematically studied.
This matters because it suggests therapeutic hope where conventional understanding suggested only decline. "Our results suggest the pancreas can retain β cells in a way that has not previously been recognized," Ahlgren explains. The insulin-producing cells that survive outside the islet structures appear in an inverted pattern compared to healthy pancreases, where beta cells are primarily concentrated in islets. The fact that extra-islet cells are more numerous than the remaining islet-associated beta cells points to a cellular reservoir that researchers had been systematically overlooking.
The breakthrough hinges on technological capability. Using advanced three-dimensional imaging at microscopic resolution, the research team—which includes doctoral student Joakim Lehrstrand—could study individual cells throughout an entire organ from all angles. "This work shows that we must look beyond the islets when studying β-cell biology in type 1 diabetes," Lehrstrand emphasizes. Traditional pancreas research has necessarily focused on the islets, the most obvious and accessible structures. But in doing so, researchers were missing the fuller picture of how the disease actually progresses.
The implications extend beyond incremental knowledge. These surviving beta cells may either possess resistance to immune destruction—a trait that could be studied and potentially harnessed—or the pancreas may be generating new beta cells in response to ongoing loss. Either scenario opens avenues for therapeutic intervention that seemed closed when the disease was understood as purely degenerative. Understanding the microenvironments where these cells survive could eventually guide the development of treatments that stabilize or even expand the remaining insulin-producing cells in type 1 diabetes.
The research team believes whole-organ three-dimensional imaging will become fundamental to future pancreas research, not only in type 1 diabetes but in type 2 diabetes and pancreatic cancer as well. These high-resolution maps can identify specific cellular neighborhoods and regions throughout the entire organ, which can then be isolated and analyzed at the molecular level—something that was "extremely difficult using conventional techniques," according to Ahlgren.
The finding transforms type 1 diabetes from a story of irreversible loss into one of cellular complexity. Those hundreds of thousands of surviving insulin-producing cells represent not just remaining function but a pathway forward, if researchers can understand what allows them to endure.