Beyond TCR Signaling: Emerging Functions of Lck in Cancer and Immunotherapy

Area of Science:

• Immunology
• Molecular Biology
• Neuroscience

Background:

• Lymphocyte-specific protein tyrosine kinase (Lck) is a key regulator of T-cell functions, including T-cell receptor signaling, development, and homeostasis.
• Lck's role is critical in cancer immunotherapy, with strategies aimed at redirecting its activity to enhance chimeric antigen receptor (CAR) efficacy and T-cell responses.
• Emerging evidence indicates Lck expression and activity in the brain and tumor cells, influencing proliferation, survival, and memory.

Purpose of the Study:

• To review the emerging roles of Lck beyond its established functions in T cells.
• To highlight Lck as a novel druggable target for cancer and neurological diseases.

Main Methods:

• This review synthesizes findings from studies utilizing Lck knock-out mice and Lck-deficient T-cell lines.
• It integrates evidence from research on Lck's involvement in cancer immunotherapy and its newly identified roles in the brain and tumor cells.

Main Results:

• Lck is essential for initiating T-cell receptor signaling, T-cell development, and maintaining T-cell homeostasis.
• Lck activity modulation is a promising strategy for improving CAR-based cancer immunotherapy.
• Lck plays significant roles in cellular processes like proliferation, survival, and memory in both neuronal and tumor cells.

Conclusions:

• Lck is a versatile kinase with critical functions in T-cell immunity and emerging roles in cancer and neurological disease.
• Lck represents a novel and druggable target for therapeutic interventions in oncology and neurology.