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Determination of thymic function directly from peripheral blood: a validated modification to an established method.

A R Lorenzi¹, A M Patterson, A Pratt

¹Musculoskeletal Research Group, Institute of Cellular Medicine, Newcastle University, Newcastle-upon-Tyne, NE2 4HH, UK.

Journal of Immunological Methods

|October 16, 2008

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This study validates a new assay to measure thymic function by quantifying T cell receptor excision circles (TREC) per milliliter of blood. This method offers a more accurate assessment of recent thymic emigrants, especially in children.

Area of Science:

Immunology
T cell biology
Clinical diagnostics

Background:

The thymus produces T cells throughout life, but its function declines with age.
Accurate measurement of thymic function is crucial after lymphoablative therapies.
T cell receptor excision circles (TREC) indicate recent thymic output, but TREC/cell counts can be skewed by peripheral proliferation.

Purpose of the Study:

To validate a novel assay for quantifying thymic function.
To establish a reproducible and robust method for measuring TREC/ml in whole blood.
To provide a clinically relevant tool for assessing thymic output, particularly in pediatric populations.

Main Methods:

Development of a novel assay to directly quantify TREC/ml from a small volume (300 microliters) of whole blood.

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Validation of the assay's reproducibility, robustness, and longitudinal stability.

Comparison of the novel assay's performance against established TREC quantification methods.

Main Results:

The novel assay accurately quantifies TREC/ml, reflecting thymic function.
The assay demonstrates reproducibility, robustness, and longitudinal stability.
The new method shows equivalent performance to standard assays.

Conclusions:

Quantifying TREC/ml in whole blood is a reliable measure of thymic function.
This validated assay is suitable for clinical use, especially in children and situations with limited tissue availability.
The assay provides a more accurate assessment of thymic output compared to TREC/cell counts.