PIEZO1 mechanically regulates the antitumour cytotoxicity of T lymphocytes

Area of Science:

• Immunology
• Cell Biology
• Biophysics

Background:

• Cytotoxic T cells are crucial for anti-tumor immunity.
• Their killing function can be modulated through biochemical and biophysical means.
• The role of mechanical sensors in T cell function is an emerging area of research.

Purpose of the Study:

• To investigate the role of the mechanical sensor PIEZO1 in T cell-mediated cytotoxicity.
• To explore PIEZO1 as a potential target for enhancing cancer immunotherapy.

Main Methods:

• Utilized cytotoxic T cells from murine tumor models and human cancer patients.
• Employed PIEZO1 antagonists to modulate T cell function.
• Analyzed changes in T cell traction forces, gene expression (GRHL3, RNF114), and actin dynamics.
• Assessed T cell infiltration and tumor growth in vivo.

Main Results:

• Blocking PIEZO1 in T cells increased their traction forces and augmented cytotoxicity against tumor cells.
• PIEZO1 upregulates GRHL3, which induces RNF114 expression.
• RNF114 downregulates and rearranges filamentous actin, reducing T cell traction forces.
• Treatment with a PIEZO1 antagonist enhanced T cell infiltration and reduced tumor growth in mice.

Conclusions:

• PIEZO1 acts as an immunomechanical regulator that dampens T cell cytotoxic function.
• Targeting PIEZO1 can enhance T cell-mediated anti-tumor immunity.
• PIEZO1 antagonism represents a promising strategy to improve cancer immunotherapy outcomes.