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The role of the innate immune cells in the development of type 1 diabetes
Date:12/19/2012

The researchers reveal the role of the innate immune cells, especially the dendritic cells, that cause the activation of the killer T-lymphocytes whose action is directed against the p pancreatic cells. The results obtained in mice make it possible to consider new ways of regulating the auto-immune reaction generated by the innate immune cells.

Type 1 diabetes, or insulin-dependent diabetes, is an auto-immune disease characterised by the destruction of insulin-producing pancreatic β cells that are present in the Islets of Langerhans which are themselves in the pancreas. The peculiarity of this type of diabetes lies in the fact that the cells are destroyed by T lymphocytes that kill the patient's immune system. This is an auto-immune reaction. Much of the research has highlighted the role of auto-reactive T lymphocytes in the pancreatic β cells. Yet the mechanisms involved in the initial activation of the immune system that triggers the sequence of events leading to the death of the cells are still ill-defined.

The work of the team working on "Immune mechanisms of Type 1 diabetes" (Inserm/Universit de Paris Descartes) in NOD (Non-obese diabetic) mice, the model used for studying Type 1 diabetes, reveals the essential role played by the cells of the innate immune system that were not hitherto considered to be involved in diabetes. These cells were known to play a role in other auto-immune diseases such as lupus and psoriasis. In this study, researchers managed to describe the mechanisms initiating the activation of T lymphocytes attaching themselves to the pancreatic β cells.

The innate immune system is normally activated when an infection occurs. This is when the mobilisation and activation of neutrophils and dendritic cells is observed, constituting the first stages of the immune response. Abnormally in NOD diabetic mice, the natural physiological death of pancreatic β cells, occurring as the process progresses, i
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Contact: Press Office
presse@inserm.fr
INSERM (Institut national de la sant et de la recherche mdicale)
Source:Eurekalert

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