Age-Related Gene Alteration in Naïve and Memory T cells Using Precise Age-Tracking Model

Area of Science:

• Immunology
• Gerontology
• Molecular Biology

Background:

• Age-related immune cell changes, particularly T cell deficiency, increase susceptibility to infections, tumors, and autoimmune diseases, and impair vaccine responses.
• Understanding gene expression in aged T cells is crucial for addressing age-related immune dysfunction.

Purpose of the Study:

• To investigate age-related changes in gene expression within aged T cell populations.
• To identify specific alterations in naïve and memory CD4+ and CD8+ T cells during aging.

Main Methods:

• Utilized a novel mouse model (TCRδR26) for tracking aged T cells.
• Performed genome-wide transcriptomic analysis on aged naïve and memory T cell populations.

Main Results:

• Identified significant gene expression alterations in aged CD4+ and CD8+ T cells.
• Aged naïve T cells exhibited decreased organelle function.
• Aged memory T cells showed increased lymphocyte activation genes, immunosuppressive markers, and immune checkpoints, indicating abnormal function.

Conclusions:

• Aging profoundly impacts T cell gene expression and signaling pathways, affecting immune function.
• Distinct apoptotic profiles were observed in aged CD4+ (pro-apoptotic) and CD8+ (anti-apoptotic) memory T cells.
• Findings offer potential for clinical interventions to improve immune health in older adults.