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Parenchymal cells in immune and tolerance induction
1Molecular Immunology, Deutsches Krebsforschungszentrum DKFZ, Im Neuenheimer Feld 280, D-69121, Heidelberg, Germany. b.arnold@dkfz.de
Immunology Letters
|October 15, 2003
Summary
Parenchymal cells, not just dendritic cells, can induce T cell tolerance. These cells activate T cells before inducing tolerance, suggesting multiple parallel mechanisms are at play for therapeutic potential.
Area of Science:
- Immunology
- Cell Biology
- Transplantation Science
Background:
- Dendritic cells are known to induce T cell tolerance to tissue-specific antigens.
- Parenchymal cells were traditionally considered immunologically inert.
- Understanding immune tolerance is crucial for managing autoimmune diseases and organ transplantation.
Purpose of the Study:
- To summarize evidence that parenchymal cells can induce peripheral T cell tolerance.
- To explore the mechanisms underlying tolerance induction by tissue-specific cells.
- To identify potential therapeutic targets for autoimmune diseases and organ transplantation.
Main Methods:
- Review of studies investigating T cell tolerance induction.
- Analysis of antigen presentation by non-immune cells.
- Examination of T cell activation preceding tolerance.
Main Results:
- Tissue cells, including liver sinusoidal endothelial cells, hepatocytes, and skin keratinocytes, can induce peripheral T cell tolerance.
- Tolerance induction by these cells is often preceded by T cell activation.
- Multiple, parallel tolerance mechanisms appear to be operating.
Conclusions:
- Parenchymal cells play a significant role in inducing peripheral T cell tolerance.
- The interplay between T cell activation and tolerance induction is complex.
- Further research is needed to determine the most effective tolerance mechanisms for therapeutic intervention in transplantation and autoimmune diseases.