Regulatory T cells and autoimmune disease

Area of Science:

• Immunology
• Cell Biology

Background:

• Autoreactive T cells persist in the periphery despite central tolerance mechanisms.
• Regulatory T cells (Tregs) are a CD4(+)CD25(+) subpopulation implicated in suppressing autoreactivity.

Purpose of the Study:

• To review the role of cytokines and costimulatory molecules in Treg generation, maintenance, and function.
• To summarize Treg involvement in autoimmune diseases.
• To discuss the role of B7 on T-effector cells as a target for Treg-mediated suppression.

Main Methods:

• Literature review of Treg function and autoimmune disease involvement.
• Discussion of molecular mechanisms of Treg-mediated suppression, focusing on B7-CD28 interactions.

Main Results:

• Tregs play a critical role in controlling autoimmune diseases like type 1 diabetes, experimental autoimmune encephalomyelitis, and inflammatory bowel disease.
• B7 expressed on activated T-effector cells can serve as a target for Treg-dependent suppression.
• Engagement of B7 on effector T cells transmits inhibitory signals, attenuating effector T-cell function.

Conclusions:

• Tregs are vital for immune homeostasis and preventing autoimmunity.
• The B7-dependent suppression pathway offers a novel target for therapeutic intervention in autoimmune disorders.
• Further research is needed to fully elucidate the complex regulatory networks involving Tregs.