Comprehensive Receptor Repertoire and Functional Analysis of Peripheral NK Cells in Soft Tissue Sarcoma Patients

Area of Science:

• Immunology
• Oncology
• Cancer Research

Background:

• Soft tissue sarcomas (STSs) are rare mesenchymal tumors with poor therapeutic response, especially in advanced stages.
• STSs were traditionally viewed as 'cold' tumors with low immune infiltration, but recent studies suggest a role for the immune system.
• Previous research indicated impaired natural killer (NK) cell activity in STS patients.

Purpose of the Study:

• To conduct an in-depth characterization of peripheral NK cells in STS patients.
• To further investigate the functional status and receptor expression of NK cells in the context of STS.

Main Methods:

• Analysis of peripheral blood samples from STS patients and healthy donors.
• Assessment of NK cell degranulation, interferon-gamma (IFNγ) production, and receptor repertoire.
• Utilized Principal Component Analysis (PCA) and Receiver Operating Characteristic (ROC) curve analysis for marker identification.

Main Results:

• STS patients displayed significantly reduced NK cell degranulation and IFNγ production compared to healthy controls.
• Dysregulated expression of activating and inhibitory NK cell receptors was observed in STS patients.
• CD27 and NKp44 were identified as key markers distinguishing STS patients, with increased CD27 correlating with reduced NK cell function.

Conclusions:

• STS patients exhibit impaired NK cell function, characterized by reduced cytotoxicity and altered receptor expression.
• A shift towards a more regulatory NK cell phenotype, indicated by increased CD27 expression, was observed in STS.
• CD27 and NKp44 show potential as biomarkers for distinguishing STS patients based on NK cell profiles.