VPS25 Promotes an Immunosuppressive Microenvironment in Head and Neck Squamous Cell Carcinoma

Area of Science:

• Oncology
• Molecular Biology
• Immunology

Background:

• The endosomal sorting complex required for transport (ESCRT) machinery is crucial for cellular functions.
• The role of ESCRT, specifically VPS25, in head and neck squamous cell carcinoma (HNSCC) remains largely unexplored.

Purpose of the Study:

• To investigate the expression and clinical significance of VPS25 in HNSCC.
• To elucidate the biological functions of VPS25 in HNSCC progression and immune evasion.
• To evaluate VPS25 as a predictive biomarker for immunotherapy response.

Main Methods:

• Analysis of The Cancer Genome Atlas (TCGA) datasets for ESCRT gene expression.
• Evaluation of VPS25 expression using bulk RNA-sequencing and HNSCC tissue microarrays (TMAs).
• Investigation of VPS25 function via single-cell RNA sequencing and VPS25 knockdown experiments.
• Assessment of immune suppression and biomarker potential using immunohistochemistry, spatial transcriptomics, and immunotherapy datasets.

Main Results:

• VPS25 was significantly overexpressed in HNSCC tissues, correlating with poor clinical outcomes.
• VPS25 promoted tumor cell proliferation and migration while decreasing immune cell infiltration in the tumor microenvironment (TME).
• VPS25 upregulated PVR expression, activating the immunosuppressive PVR-TIGIT axis and facilitating immune evasion.

Conclusions:

• VPS25 is a key regulator of tumor progression and immune evasion in HNSCC.
• VPS25 overexpression contributes to a suppressive tumor microenvironment and facilitates immune escape.
• VPS25 shows promise as a predictive biomarker for immunotherapy response in HNSCC and a potential therapeutic target.