Variation in peripheral blood T cell subsets in serial assays

Area of Science:

• Immunology
• Cell Biology
• Biotechnology

Background:

• Accurate T cell subset analysis is crucial for immunological research and clinical diagnostics.
• Variability in sample handling and analysis can impact the reliability of T cell subset data.
• Cryopreservation is a common method for preserving biological samples, but its effect on T cell subsets needs careful evaluation.

Purpose of the Study:

• To compare T cell subset profiles in fresh versus cryopread peripheral blood mononuclear cells (PBM).
• To assess the impact of serial versus simultaneous analysis on T cell subset variability.
• To provide recommendations for optimizing sample handling in longitudinal immunological studies.

Main Methods:

• Peripheral blood mononuclear cells (PBM) were obtained from six healthy donors.
• Samples were analyzed fresh or after cryopreservation.
• T cell subsets were quantified using Ortho monoclonal antibodies and fluorescence-activated cell sorting (FACS).

Main Results:

• No significant differences were observed in T cell subsets between fresh and cryopreserved PBM.
• Higher variability in T cell subset analysis was detected when cryopreserved samples were assayed serially.
• Simultaneous analysis of cryopreserved samples under identical conditions significantly reduced inter-assay variation.

Conclusions:

• Cryopreservation of PBM is a viable method for maintaining T cell subset integrity.
• Serial analysis of cryopreserved samples introduces significant variability, potentially confounding longitudinal study results.
• To minimize errors in longitudinal studies, cryopreserving samples and analyzing them together at a single time point is recommended.