Regulatory T cells in human autoimmune diseases

Area of Science:

• Immunology
• Autoimmunity
• Cellular Biology

Background:

• Immune tolerance is a balance between autoreactive cells and regulatory mechanisms.
• Autoimmunity results from a shift towards autoreactive cells, while immunodeficiency may arise from excessive regulation.
• Regulatory T cells (TREG), especially CD4(+)CD25(+) TREG cells, are crucial for maintaining immune homeostasis.

Purpose of the Study:

• To review the current understanding of TREG cells' role in human autoimmune diseases.
• To explore human immunodeficiencies that serve as models for studying autoimmunity.
• To highlight the significance of FOXP3 in TREG development and function.

Main Methods:

• Review of existing literature on TREG cells, FOXP3, autoimmunity, and immunodeficiency.
• Analysis of human and mouse syndromes with FOXP3 mutations.
• Discussion of newly developed antibody reagents for identifying CD4(+)CD25(+) TREG cells.

Main Results:

• FOXP3 is a critical factor in the development and function of CD4(+)CD25(+) TREG cells.
• Mutations in FOXP3 lead to absence of TREG cells and provide insights into their role.
• New antibody reagents facilitate the identification and study of TREG cells in human diseases.

Conclusions:

• TREG cells, identified by FOXP3 expression, play a vital role in preventing autoimmunity.
• Understanding TREG cell function is crucial for developing treatments for autoimmune diseases and immunodeficiencies.
• FOXP3 mutations offer valuable models for dissecting the complexities of immune regulation.