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Type I Diabetes II: Pathophysiology01:26

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Type 1 diabetes mellitus arises from an immune-mediated destruction of pancreatic β-cells, resulting in an absolute deficiency of insulin. This process develops in genetically susceptible individuals when autoimmunity, environmental exposures, and immunologic dysregulation converge to trigger a targeted attack on the insulin-producing cells of the pancreas. The β-cells are located within the islets of Langerhans and are essential for regulating blood glucose by facilitating cellular uptake of...
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Updated: May 17, 2026

Accelerated Type 1 Diabetes Induction in Mice by Adoptive Transfer of Diabetogenic CD4+ T Cells
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Carbon monoxide-treated dendritic cells decrease β1-integrin induction on CD8⁺ T cells and protect from type 1

Thomas Simon1, Sylvie Pogu, Virginie Tardif

  • 1ONIRIS, UMR_A 707 IECM, Nantes, France.

European Journal of Immunology
|October 16, 2012
PubMed
Summary
This summary is machine-generated.

Carbon monoxide (CO) treatment of dendritic cells (DCs) prevents autoimmune diabetes in mice. This novel immunotherapy strategy inhibits autoreactive CD8(+) T cells, offering a new approach to controlling autoimmune diseases.

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Area of Science:

  • Immunology
  • Autoimmune Diseases
  • Cell Therapy

Background:

  • Carbon monoxide (CO) is known to promote tolerance in autoimmune diseases.
  • The precise mechanisms underlying CO-mediated protective tolerance remain undefined.
  • Dendritic cells (DCs) play a crucial role in immune responses and tolerance induction.

Purpose of the Study:

  • To investigate the therapeutic potential of ex vivo gaseous CO (gCO)-treated DCs loaded with pancreatic β-cell peptides in a mouse model of autoimmune diabetes.
  • To elucidate the mechanism by which CO-treated DCs confer protection against autoimmune diabetes.

Main Methods:

  • Utilized a transgenic mouse model for autoimmune diabetes.
  • Treated dendritic cells (DCs) ex vivo with gaseous carbon monoxide (gCO).
  • Loaded gCO-treated DCs with pancreatic β-cell peptides for immunization.
  • Analyzed T cell responses, including CD4(+) and CD8(+) T cell function, accumulation in the pancreas, and β1-integrin expression.

Main Results:

  • gCO-treated DCs loaded with pancreatic β-cell peptides protected mice from autoimmune diabetes in a peptide-restricted manner.
  • Protection was independent of IL-10 secretion by DCs and CD4(+) T cells.
  • gCO-treated DCs inhibited the accumulation of autoreactive CD8(+) T cells in the pancreas.
  • Priming with gCO-treated DCs curtailed β1-integrin induction on CD8(+) T cells, impairing their islet-lysing capacity.

Conclusions:

  • Immunotherapy using CO-treated DCs is a novel strategy for controlling autoimmune diseases.
  • CO-treated DCs suppress autoimmune diabetes by inhibiting autoreactive CD8(+) T cell accumulation and function.
  • The mechanism involves reduced β1-integrin expression and impaired cytotoxic activity of CD8(+) T cells.