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Updated: Aug 13, 2026
09:47
Generation of Human Alloantigen-specific T Cells from Peripheral Blood
Published on: November 21, 2014
Functional avidity directs T-cell fate in autoreactive CD4+ T cells
Roberto Mallone1, Sharon A Kochik, Helena Reijonen
1Benaroya Research Institute at Virginia Mason, 1201 Ninth Ave, Seattle, WA 98101, USA.
Blood
|July 21, 2005
Summary
Two types of antigen-specific CD4+ T cells were found in type 1 diabetes. High-avidity T cells can become anergic and suppressive, offering potential therapeutic strategies for autoimmune diseases.
Area of Science:
- Immunology
- Autoimmunity
- T cell biology
Background:
- Type 1 diabetes involves autoimmune destruction of pancreatic beta cells by T cells.
- Understanding T cell behavior in autoimmunity is crucial for developing effective therapies.
Purpose of the Study:
- To characterize distinct populations of antigen-specific CD4+ T cells in type 1 diabetes.
- To investigate the functional fates and regulatory potential of these T cells.
Main Methods:
- Major histocompatibility complex (MHC) class II tetramer staining.
- Activation analysis of peripheral blood T cells.
- Assessment of apoptosis and anergy induction.
- Evaluation of regulatory T cell function.
Main Results:
- Two types of CD4+ T cells, differing in peptide-MHC ligand recognition avidity, were identified.
- High-avidity T cells, upon prolonged antigen exposure, acquired anergic and suppressive properties.
- Suppression was contact-dependent and involved down-regulation of antigen-presenting cell molecules.
- Apoptosis-resistant T cells, including high-avidity ones, persisted and exhibited regulatory functions.
Conclusions:
- High-avidity autoreactive T cells can be maintained in circulation by acquiring anergic and suppressive phenotypes.
- Regulation of antigen-presenting cell function represents a novel suppressive mechanism.
- These findings suggest potential therapeutic applications for peptide-MHC-based treatments in type 1 diabetes.
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