T cell functions and organ infiltration by leukemic T cells require cortactin

Area of Science:

• Immunology
• Cell Biology
• Hematology

Background:

• T cell acute lymphoblastic leukemia (T-ALL) is aggressive and often fatal.
• Cortactin's role in T-ALL pathogenesis is largely unknown.
• Cortactin influences CXCR4 localization and T cell migration.

Purpose of the Study:

• To investigate cortactin's function in normal T cell activation and migration.
• To determine cortactin's role in T-ALL development and organ infiltration.
• To evaluate cortactin as a potential therapeutic target for T-ALL.

Main Methods:

• Studied cortactin's role in normal T cells upon T cell receptor engagement.
• Assessed T cell activation, proliferation, and immune synapse formation in cortactin-depleted cells.
• Utilized xenotransplantation assays in NSG mice to model T-ALL organ infiltration.

Main Results:

• Cortactin is upregulated and recruited to the immune synapse in normal T cells.
• Cortactin depletion impairs T cell activation, IL-2 production, and migration.
• Leukemic T cells show higher cortactin levels correlating with increased migration.
• Cortactin-depleted T-ALL cells exhibit reduced bone marrow colonization and CNS infiltration in mice.

Conclusions:

• Cortactin is essential for T cell activation, immune synapse formation, and migration.
• Cortactin overexpression drives T-ALL organ infiltration and potentially relapse.
• Cortactin represents a promising therapeutic target for T-ALL.