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Cytokine signatures in human (pre-)diabetic pancreas

Subject Area Endocrinology, Diabetology, Metabolism
Term from 2018 to 2021
Project identifier Deutsche Forschungsgemeinschaft (DFG) - Project number 409226100
 
Final Report Year 2022

Final Report Abstract

We wished to explore the impact of anti-inflammatory cytokines IL4 and IL10 on a dynamic in vitro model of human T1D. Human islet microtissues and pancreatic islets were exposed to either a proinflammatory cytokine cocktail alone; activated and partially HLA-matched PBMC alone; or both. This resulted in an immune attack against the islet with a functional decline of beta cells, infiltration of PBMC into the islet, and an upregulation of HLA-I on beta cells (a known beta cell stress marker). To capture the dynamics of the immune attack and beta cell demise, we performed acute experiments in islets exposed to stressors for a few hours and chronic experiments in islets stressed for multiple days. Islets were preincubated with IL10 or IL4 to assess if either could protect the islets from stressor-mediated insult. Preincubation with IL4 or IL10 failed to protect the islets from loss of endocrine function assessed by GSIS. However, both cytokines successfully reduced the infiltration rates of activated T cells into the islet. They may thus protect the islet from the autoimmune attack and have beneficial effects in the context of T1D development. HLA-I expression on beta cells was upregulated in response to chronic proinflammatory cytokine-induced or PBMC-induced stress. This was not affected through preincubation with anti-inflammatory cytokines. However, HLA-I expression on beta cells was associated with infiltration of PBMC into the islets and both HLA-I expression and infiltration were associated with impaired insulin secretion. In summary, our results support the hypothesis that a loss of beta cell endocrine function intrinsically mediates an increase in the presentation of autoantigenic peptides associated with HLA-I. This may ultimately target them for CD8 T cell-mediated immune destruction.

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