Hijacking TYRO3 from Tumor Cells via Trogocytosis Enhances NK-cell Effector Functions and Proliferation

Area of Science:

• Immunology
• Cell Biology

Background:

• Trogocytosis is a cell-cell contact-dependent process for transferring membrane patches.
• Natural killer (NK) cells are crucial for innate immunity against tumors and infections.

Purpose of the Study:

• To investigate the trogocytosis of TYRO3 from tumor cells to NK cells.
• To determine the functional consequences of TYRO3 acquisition by NK cells.
• To explore the potential of TYRO3 transfer for NK cell-based therapies.

Main Methods:

• In vitro and in vivo studies of trogocytosis.
• Flow cytometry to detect TYRO3 expression on NK cells.
• Cytotoxicity assays and IFNγ production measurements.

Main Results:

• Activated NK cells acquired TYRO3 from tumor cells via trogocytosis.
• TYRO3-positive (TYRO3+) NK cells exhibited enhanced cytotoxicity and IFNγ production.
• TYRO3 transfer improved NK cell proliferation when K562 leukemia cells overexpressed TYRO3.

Conclusions:

• NK cell trogocytosis of TYRO3 enhances their anti-tumor functions.
• TYRO3 transfer can be leveraged to improve NK cell expansion and efficacy.
• This presents a novel strategy for engineering NK cells for cancer immunotherapy.