Analyses and comparisons of telomerase activity and telomere length in human T and B cells: insights for epidemiology of telomere maintenance.
Level 4 - case-series / case-control
Cross-sectional comparative biomarker study in human donors
PubMed 19837074 · doi:10.1016/j.jim.2009.09.012
What was done
Investigators measured and compared telomerase activity and telomere length across isolated peripheral blood mononuclear cell (PBMC) subpopulations—CD4+, CD8+CD28+, and CD8+CD28- T cells, and B cells—as well as total PBMCs from the same donors in a cohort of healthy women.
What was found
B cells exhibited the highest telomerase activity and longest telomere length. CD4+ T cells had slightly higher telomerase activity than CD8+CD28+ T cells, while displaying similar telomere length. CD8+CD28- T cells had the lowest telomerase activity and shortest telomere length. A higher proportion of CD8+CD28- T cells correlated with shorter total PBMC telomere length (r = -0.26, p = 0.05). Telomerase activity levels in CD4+ and CD8+CD28+ T cells within the same donor were positively correlated (r = 0.55, p < 0.001).
Why it matters
Because clinical and epidemiological studies typically assess whole leukocyte populations, showing how telomere length and telomerase activity vary by cell subtype clarifies how immune cell composition shifts can influence aggregate telomere biomarker readouts.
Limits
The abstract does not report the sample size (n). The study was conducted only in healthy women, limiting generalizability to men or diseased populations. The cross-sectional design cannot evaluate longitudinal telomere attrition dynamics.
Cited by
- supports Telomerase activity measured in normal peripheral blood cells is associated with metabolic health and socioeconomic circumstances.