Yap suppresses T-cell function and infiltration in the tumor microenvironment

Area of Science:

• Immunology
• Cancer Biology
• Molecular Biology

Background:

• Solid tumors create an immunosuppressive environment, hindering effective cancer immunotherapy.
• Sustaining T-cell activation and tumor infiltration remains a significant challenge.

Purpose of the Study:

• To investigate the role of Yes-associated protein (Yap) in T-cell responses within the tumor microenvironment.
• To determine if targeting Yap can enhance anti-tumor immunity.

Main Methods:

• Analyzing Yap levels in activated CD4+ and CD8+ T cells.
• Evaluating T-cell activation, differentiation, and function following Yap deletion in T cells.
• Assessing in vivo tumor infiltration and repression by T cells lacking Yap.
• Performing gene expression analysis on tumor-infiltrating T cells.

Main Results:

• Yap levels increase upon T-cell activation and act as an immunosuppressive factor.
• Loss of Yap in T cells leads to enhanced activation, differentiation, and effector function.
• Yap deletion improves T-cell infiltration and tumor repression in vivo.
• Yap negatively regulates T-cell infiltration and patient survival across various cancers.

Conclusions:

• Yap is a critical regulator of T-cell biology and function in the context of cancer.
• Targeting Yap in T cells represents a promising strategy to enhance cancer immunotherapy efficacy.