Characterisation of human pancreatic mesenchymal stromal cells in type 1 diabetes

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

• Level A · Stronger Clinical Evidence
• Level B · Emerging clinical evidence with positive signals
• Level C · Early human research exploring benefits
• Level D · Scientific groundwork from lab and animal studies
• Emerging · Emerging topic under active research

Abstract (original English)

Aims/hypothesis Culture-expanded mesenchymal stromal cells (MSCs) reduce immune cell activation and improve islet functional survival. However, little is known about human pancreatic MSCs (pMSCs) in health or how they are altered in type 1 diabetes. Here, we determined the number, density and islet-protective phenotype of pMSCs in situ in individuals with and without type 1 diabetes. Methods Multiplex immunohistochemistry was used to identify pMSCs (CD90 + /CD105 + /CD73 + /CD31 - /CD45 - /CD34 - ) in human pancreas sections from 38 donors (Network for Pancreatic Organ Donors with Diabetes and Exeter Archival Diabetes Biobank). Donors were categorised as either Results pMSCs were identified in situ in the human pancreas where they wrap around the islet periphery in an expected spindle-like morphology. ANXA1 was expressed by 33.2% of pMSCs and was expressed constitutively among individuals with or without diabetes. The density of both intraislet pMSCs and pMSCs within 10 µm of the islet periphery was increased for insulin-containing islets in individuals with type 1 diabetes compared with individuals without diabetes (p Conclusions/interpretation pMSCs express ANXA1 constitutively, suggesting an islet-protective role in health. The density of pMSCs was increased around insulin-containing islets and lost around insulin-deficient islets in individuals with type 1 diabetes which al

Evidence level

Evidence from laboratory and animal studies provides groundwork for understanding mechanisms and potential before human studies continue.

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