Lymphocyte enrichment using CD81-targeted immunoaffinity matrix.

Area of Science:

• Immunology
• Biotechnology
• Data Science

Background:

• Accurate lymphocyte isolation is crucial for reproducible mass cytometry results.
• Current methods like Ficoll-Paque may not achieve optimal purity, impacting data acquisition and analysis.
• Novel cell isolation techniques are needed to enhance sample quality for high-dimensional cytometry.

Purpose of the Study:

• To evaluate the efficacy of CD81+ immune affinity chromatography (T-catch™) for purifying peripheral blood lymphocytes.
• To compare the purity and efficiency of T-catch™ against the traditional Ficoll-Paque density gradient method.
• To assess the impact of isolation methods on data acquisition time and the utility of unsupervised analysis (viSNE).

Main Methods:

• Peripheral blood lymphocytes were isolated using both Ficoll-Paque and CD81+ T-catch™ immune affinity chromatography.
• Samples were analyzed using mass cytometry with a 21-metal conjugated antibody panel.
• Unsupervised high-dimensional analysis (viSNE) and supervised manual gating were employed for comparative analysis.

Main Results:

• CD81+ T-catch™ isolation resulted in significantly purer lymphocyte suspensions compared to Ficoll-Paque (P=0.0156).
• T-catch™ reduced platelet contamination and decreased data acquisition time by 3.5-fold for 10^5 cells.
• viSNE analysis confirmed supervised gating, identified new cell subsets, and revealed inaccuracies in standard gating strategies.

Conclusions:

• CD81+ immune affinity chromatography is a superior method for lymphocyte isolation in mass cytometry.
• Effective impurity removal is essential for sensitive detection of rare cell populations, particularly in unsupervised analysis.
• Integrating unsupervised analysis with conventional gating provides a more comprehensive understanding of complex cellular data.