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A reduced peripheral blood CD4(+) lymphocyte proportion is a consistent ageing phenotype.
Jichun Chen1, Kevin Flurkey, David E Harrison
1The Jackson Laboratory, Bar Harbor, ME 04609, USA.
Mechanisms of Ageing and Development
|November 24, 2001
Summary
Aging significantly reduces CD4(+) T lymphocytes in mice, a consistent finding across multiple strains. This age-related decline in immune cell proportions highlights key changes in the aging immune system.
Area of Science:
- Immunology
- Gerontology
- Cell Biology
Background:
- Aging is associated with significant alterations in immune cell populations.
- T lymphocytes play a crucial role in adaptive immunity and their age-related changes are of great interest.
Purpose of the Study:
- To investigate the hypothesis that aging leads to a decline in peripheral blood T lymphocyte proportions.
- To determine if this decline is consistent across different mouse strains.
Main Methods:
- Flow cytometry was used to analyze peripheral blood leukocyte composition in young, middle-aged, and old mice.
- Multiple inbred strains of Mus musculus (B6, BALB, A/J, CBA/CaJ, DBA/2J, DW/J) and a hybrid ((DWxC3H) F1) were studied.
Main Results:
- A significant, continuous decline in CD4(+) lymphocyte proportions was observed with increasing age in all tested strains.
- CD8(+) lymphocyte proportions showed a moderate decline, while B lymphocyte proportions remained largely unchanged.
- Naive T lymphocytes (CD44(low)) decreased with age, and granulocytes (Gr1(+)) increased significantly.
Conclusions:
- A reduced proportion of peripheral blood CD4(+) lymphocytes is a consistent aging phenotype in a wide range of Mus musculus strains.
- These findings underscore the impact of aging on T cell homeostasis and immune function.