IFN-α induces a preferential long-lasting expression of MHC class I in human pancreatic beta cells.

Autor: Coomans de Brachène, Alexandra, Dos Santos, Reinaldo S., Marroqui, Laura, Colli, Maikel L., Marselli, Lorella, Mirmira, Raghavendra G., Marchetti, Piero, Eizirik, Decio L.
Zdroj: Diabetologia; Mar2018, Vol. 61 Issue 3, p636-640, 5p, 1 Color Photograph, 1 Graph
Abstrakt: Aims/hypothesis: IFN-α, a cytokine expressed in human islets from individuals affected by type 1 diabetes, plays a key role in the pathogenesis of diabetes by upregulating inflammation, endoplasmic reticulum (ER) stress and MHC class I overexpression, three hallmarks of islet histology in early type 1 diabetes. We tested whether expression of these mediators of beta cell loss is reversible upon IFN-α withdrawal or IFN-α pathway inhibition.Methods: IFN-α-induced MHC class I overexpression, ER stress and inflammation were evaluated by flow cytometry, immunofluorescence and real-time PCR in human EndoC-βH1 cells or human islets exposed to IFN-α with or without the presence of Janus kinase (JAK) inhibitors. Protein expression was evaluated by western blot.Results: IFN-α-induced expression of inflammatory and ER stress markers returned to baseline after 24–48 h following cytokine removal. In contrast, MHC class I overexpression at the cell surface persisted for at least 7 days. Treatment with JAK inhibitors, when added with IFN-α, prevented MHC class I overexpression, but when added 24 h after IFN-α exposure these inhibitors failed to accelerate MHC class I return to baseline.Conclusions/interpretation: IFN-α mediates a long-lasting and preferential MHC class I overexpression in human beta cells, which is not affected by the subsequent addition of JAK inhibitors. These observations suggest that IFN-α-stimulated long-lasting MHC class I expression may amplify beta cell antigen presentation during the early phase of type 1 diabetes and that IFN-α inhibitors might need to be used at very early stages of the disease to be effective. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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