DOCK8 in immune cells: roles and mechanisms

Area of Science:

• Immunology
• Cell Biology
• Molecular Biology

Background:

• Dedicator of cytokinesis 8 (DOCK8) is an atypical guanine nucleotide exchange factor (GEF) that activates Rho GTPases, particularly Cdc42.
• DOCK8 plays a critical role in orchestrating cytoskeletal remodeling and integrating signaling pathways essential for immune cell function.
• Recent research highlights DOCK8 as a central regulator in both innate and adaptive immunity.

Purpose of the Study:

• To elucidate the multifaceted roles of DOCK8 across various immune cell types.
• To understand how DOCK8 integrates diverse signaling pathways to maintain immune cell integrity and function.
• To highlight the consequences of DOCK8 deficiency, including immunodeficiency and allergic manifestations.

Main Methods:

• Review and synthesis of existing literature on DOCK8 function in immune cells.
• Analysis of DOCK8's mechanistic roles in T cells, B cells, NK cells, dendritic cells, and macrophages.
• Examination of DOCK8's integration of signaling inputs from TCR, BCR, and Toll-like receptors.

Main Results:

• DOCK8 is vital for T cell migration, synapse assembly, and survival, supporting antiviral defense.
• In B cells, DOCK8 regulates BCR signaling, metabolic reprogramming, and germinal center reactions, underpinning humoral immunity.
• DOCK8 modulates NK cell cytotoxicity and localization, and regulates dendritic cell and macrophage migration and activation.

Conclusions:

• DOCK8 acts as a critical signaling hub, coordinating cell polarity, migration, and effector functions across diverse immune cells.
• DOCK8 deficiency results in a complex immunodeficiency syndrome with increased susceptibility to infections and allergic conditions.
• Further research is needed to fully elucidate DOCK8's integrated signaling networks and explore therapeutic interventions.