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Primary Lymphoid Organs

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Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...

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Related Experiment Video

Updated: Jun 10, 2026

Real Time In Vivo Tracking of Thymocytes in the Anterior Chamber of the Eye by Laser Scanning Microscopy

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Tracing thymic output in older individuals.

W A Mitchell¹, P O Lang, R Aspinall

¹Department of Immunology, Imperial College, London Translational Medicine Group, Cranfield University, Beds, UK.

Clinical and Experimental Immunology

|July 22, 2010

Summary

T cell production declines with age due to thymic atrophy. Signal-joint T cell receptor excision circles (sjTREC) analysis in over 200 adults reveals a significant decline in thymic output after age 90, suggesting sjTREC as a biomarker of aging.

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Last Updated: Jun 10, 2026

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Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays

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Published on: June 9, 2015

Area of Science:

Immunology
Gerontology
Biomarker Discovery

Background:

Age-associated thymic atrophy leads to decreased T cell production.
Existing models of T cell decline (exponential vs. biphasic) are based on limited data.
Understanding thymic output changes is crucial for assessing immune function in aging.

Purpose of the Study:

To investigate age-associated changes in thymic T cell output.
To determine the reliability of signal-joint T cell receptor excision circles (sjTREC) as a measure of thymic output.
To explore gender differences in thymic output across a wide age range.

Main Methods:

Analysis of blood samples from over 200 individuals aged 58-104 years across five European countries.
Quantification of T cells and sjTREC per microlitre of blood.
Statistical analysis to assess age- and gender-related changes in sjTREC/T cell levels.

Main Results:

Absolute T cell counts remained stable, but sjTREC levels showed significant age-associated decline.
Females exhibited higher thymic output than males across all decades.
A marked decrease in sjTREC/T cell levels was observed in individuals over 90 years old.

Conclusions:

Thymic output significantly declines in very old age (over 90 years).
sjTREC levels serve as a reliable indicator of age-related thymic output.
sjTREC analysis may function as a biomarker for effective aging and immune senescence.