Activation and control of self-reactive gammadelta T cells

Area of Science:

• Immunology
• Cell Biology

Background:

• Mammalian and avian CD3+ T cells differentiate into alphabeta T cells and gammadelta T cells, each expressing heterodimeric T-cell receptors (TCR).
• While distinct roles for both T cell types are recognized, the precise functions of gammadelta T cells remain incompletely understood.
• Emerging evidence suggests gammadelta T cells are involved in homeostatic control beyond early immune protection.

Purpose of the Study:

• To review the current understanding of gammadelta T cell functions.
• To discuss the specificity and effector properties of self-reactive gammadelta T cell subsets.
• To explore mechanisms regulating self-reactive gammadelta T cells.

Main Methods:

• Literature review of studies on T-cell subsets, particularly gammadelta T cells.
• Analysis of findings from transgenic models and studies on rodent and human T cells.
• Discussion of immunological mechanisms and cell properties.

Main Results:

• Gammadelta T cells are implicated in the homeostatic control of both immune and non-immune processes.
• Self-reactive gammadelta T cell subsets exist in various species, exhibiting specificities and effector functions.
• Mechanisms for controlling self-reactive gammadelta T cells while preserving their beneficial properties are being investigated.

Conclusions:

• Gammadelta T cells likely play essential, nonredundant roles in immune regulation and homeostasis.
• Understanding the balance between self-reactivity and regulatory function is key to harnessing gammadelta T cell potential.
• Further research is needed to fully elucidate the complex functions and therapeutic applications of gammadelta T cells.