A Hidden Reservoir of Insulin Cells Discovered in Type 1 Diabetes
In a breakthrough for diabetes research, scientists at Umeå University have created the first complete three-dimensional map of an entire human pancreas from a donor with late-onset type 1 diabetes. Using advanced imaging technologies at microscopic resolution, their findings challenge long-held assumptions about how the disease progresses.
Key Findings
The analysis revealed a striking anomaly. While the traditional islets of Langerhans were largely depleted of insulin-producing β-cells, a substantial number of insulin-positive cells remained outside the islet structures. These cells were primarily found as individual entities or small clusters scattered throughout the organ.
- Hundreds of thousands of insulin-positive objects were identified in total.
- The proportion of β-cells located outside the islets was inverted compared to non-diabetic subjects.
A New Interpretation
The presence of these extra-islet β-cells may indicate one of two possibilities, according to the researchers: either these cells are naturally resistant to the autoimmune destruction that characterizes type 1 diabetes, or they represent newly formed β-cells, suggesting a limited regenerative capacity.
"Our results suggest the pancreas can retain β cells in a way that has not previously been recognized."
— Ulf Ahlgren, Professor at the Department of Medical and Translational Biology, Umeå University
This discovery has significant implications for how we measure the disease. The study suggests that traditional, islet-focused analyses may significantly underestimate the number of surviving β-cells in type 1 diabetes.
What the Researchers Say
- Ulf Ahlgren: "The ability to study individual cells throughout an entire organ and from all angles has the potential to change how we think about β-cell loss."
- Doctoral student Joakim Lehrstrand: "This work shows that we must look beyond the islets when studying β-cell biology in type 1 diabetes."
Implications for Future Therapies
The researchers argue this hidden cellular reservoir could unlock new therapeutic strategies.
- Understanding the microenvironments that promote β-cell survival could help develop therapies to stabilize or expand remaining β-cells.
- These findings could lead to novel treatments targeting a previously overlooked cellular reservoir.
The research group believes whole-organ 3D imaging will become a key tool for studying type 1 diabetes, type 2 diabetes, and pancreatic cancer, enabling the identification and isolation of specific regions for molecular analyses.
Publication
The study was published in Science Advances.