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Publication : In CD4+ T-cell-induced diabetes, macrophages are the final effector cells that mediate islet beta-cell killing: studies from an acute model.

First Author  Calderon B Year  2006
Journal  Am J Pathol Volume  169
Issue  6 Pages  2137-47
PubMed ID  17148676 Mgi Jnum  J:116218
Mgi Id  MGI:3693180 Doi  10.2353/ajpath.2006.060539
Citation  Calderon B, et al. (2006) In CD4+ T-cell-induced diabetes, macrophages are the final effector cells that mediate islet beta-cell killing: studies from an acute model. Am J Pathol 169(6):2137-47
abstractText  To understand better how diabetogenic CD4+ T cells induce islet beta-cell death and cause diabetes, a transfer model of acute diabetes using the diabetogenic CD4+ BDC2.5 T-cell clone was established. Transfer of activated BDC T cells into NOD.scid mice resulted in diabetes within a week, characterized by strong inflammatory reaction. Electron micrographs of pancreas depicted macrophages in close contact with beta cells that exhibited signs of apoptosis. Transfer into irradiated recipients inhibited inflammation and the development of diabetes, demonstrating an obligatory role for leukocytes. Selective depletion of neutrophils or natural killer cells had no effect on diabetes induced by BDC2.5 T cells. In contrast, in vivo depletion of phagocytic cells by injection of liposomes containing clodronate abolished diabetes, although inflammation remained present and was characterized mainly by neutrophil infiltration. Treatment with clodronate-liposomes did not affect the antigen-presenting cells within the pancreas. Last, activated macrophages isolated from infiltrated pancreas exhibited cytolytic activity toward primary islet beta cells. Taken together, these results demonstrate that activated macrophages are the key cells mediating islet beta-cell death induced by activated CD4+ T cells.
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