Lyophilized T Cell Reference Materials with Quantified Proportions of Subtypes

Area of Science:

• Biotechnology
• Immunology
• Analytical Chemistry

Background:

• Accurate quantification of T cell subtypes is crucial for biomanufacturing, diagnostics, and advanced therapies.
• Cell reference materials (RMs) are essential for reliable T cell quantification but developing practical and accurate RMs is challenging.

Purpose of the Study:

• To develop accurate and stable T cell reference materials (RMs) with certified subtype proportions.
• To establish a foundation for reliable and consistent T cell quantification globally.

Main Methods:

• Developed a quantitative flow cytometry method using calibrated polystyrene beads for accurate T cell subtype ratio determination.
• Implemented an innovative lyophilization technique for long-term preservation of T cell RMs.
• Validated RM integrity and stability through immunofluorescence, antigen characterization, and 12-month monitoring at 4 °C.

Main Results:

• Achieved low relative standard deviations (RSD) for T cell subtype quantification: 0.43% for CD3+, 0.64% for CD4+, and 1.31% for CD8+.
• Demonstrated excellent integrity of lyophilized T cell RMs, comparable to fresh cells, in terms of morphology and surface antigen expression.
• Confirmed 12-month stability at 4 °C for the developed T cell RMs.
• Successfully applied one RM for calibrating 54 flow cytometry instruments, showcasing its utility.

Conclusions:

• The developed T cell RMs offer accurate quantification and long-term stability, addressing a critical need in cell-based applications.
• These RMs have significant potential for quality control in multiparameter flow cytometry and validation of T cell assays.
• The study provides a robust solution for enhancing the reliability and consistency of T cell measurements worldwide.