T cell CD3ζ deficiency enables multiorgan tissue inflammation.

Area of Science:

• Immunology
• Pathogenesis Research

Background:

• CD3ζ chain deficiency is observed in T cells across various diseases, including autoimmune disorders, cancer, and infections.
• The specific role of CD3ζ chain deficiency in disease pathogenesis and organ injury remains largely undetermined.

Purpose of the Study:

• To investigate the contribution of CD3ζ chain deficiency to organ tissue inflammation.
• To elucidate the mechanisms by which CD3ζ deficiency influences T cell behavior and promotes inflammation.

Main Methods:

• Utilized CD3ζ-deficient (CD3ζ(-/-)) mice to model T cell CD3ζ deficiency.
• Administered polyinosinic:polycytidylic acid and allogeneic cells to assess accelerated inflammation.
• Analyzed T cell expression of adhesion molecules (CD44, CCR2) and cytokine production (IFN-γ).

Main Results:

• CD3ζ(-/-) mice spontaneously developed significant organ inflammation.
• Inflammation was accelerated by polyinosinic:polycytidylic acid or graft-versus-host conditions.
• T cells from CD3ζ(-/-) mice showed increased CD44 and CCR2 expression and produced more IFN-γ.
• IFN-γ blockade mitigated tissue inflammation, indicating its role in the process.

Conclusions:

• CD3ζ deficiency enhances T cell infiltration into tissues, driving inflammation and organ damage.
• Reduced CD3ζ expression is an independent contributor to tissue inflammation and organ injury in various diseases.
• Restoring surface T cell CD3ζ expression presents a potential therapeutic strategy to reduce tissue inflammation.