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Related Experiment Video

Updated: Dec 13, 2025

Isolation and Transplantation of Different Aged Murine Thymic Grafts.

Isolation and Transplantation of Different Aged Murine Thymic Grafts.

Published on: May 13, 2015

Human Thymic Involution and Aging in Humanized Mice.

Qing-Yue Tong^1,2, Jue-Chao Zhang^1,2, Jing-Long Guo^1,2

¹Key Laboratory of Organ Regeneration & Transplantation of the Ministry of Education, The First Hospital of Jilin University, Changchun, China.

Frontiers in Immunology

|August 1, 2020

Summary

This summary is machine-generated.

Human thymus aging (involution) was studied in humanized mice. This model reveals intrinsic aging mechanisms and stress susceptibility, aiding research into immune system aging.

Keywords:

aging human humanized mouse recent thymic emigrants thymus involution

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Area of Science:

Immunology
Aging Research
Transplantation Biology

Background:

Thymic involution significantly contributes to immune system aging.
Human thymic aging is poorly understood due to limited longitudinal study models.
Existing knowledge primarily relies on mouse models, which may not fully represent human processes.

Purpose of the Study:

To investigate human thymic involution using a humanized mouse model.
To explore the potential of this model for studying age-related changes in the human thymus.
To assess the utility of this model for testing therapeutic interventions for thymic aging.

Main Methods:

Construction of humanized mice by transplanting fetal human thymus and CD34+ hematopoietic stem/progenitor cells into immunodeficient mice.
Longitudinal observation of thymic grafts for signs of involution.
Analysis of thymic epithelial cells, recent thymic emigrants, adipose tissue mass, and gene expression (FOXN1, AIRE).

Main Results:

Human thymic grafts exhibited acute, recoverable involution post-transplantation, followed by chronic, age-related involution.
Both involution types decreased thymic epithelial cells and recent thymic emigrants.
Age-related involution was uniquely associated with increased thymic adipose tissue and reduced FOXN1/AIRE expression.

Conclusions:

Human thymus possesses intrinsic aging mechanisms and is susceptible to stress-induced involution.
The humanized mouse model effectively recapitulates key features of human thymic involution.
This model provides a valuable platform for in vivo studies of human thymic aging and therapeutic strategies.