Pubertal stage specific changes in T-cell subpopulations in healthy individuals

Area of Science:

• Immunology
• Developmental Biology
• Transplantation Science

Background:

• Adolescence is linked to worse kidney transplant outcomes.
• Puberty's impact on immune cell dynamics, particularly T-cells, is not fully understood.
• A shift towards a pro-inflammatory immune phenotype during puberty is hypothesized.

Purpose of the Study:

• To investigate the effect of puberty on T-cell subpopulations in healthy individuals.
• To correlate changes in T-cell profiles with pubertal maturation.
• To provide insights into immune system development during adolescence.

Main Methods:

• Assessed pubertal maturation using skeletal age and Tanner stage in 66 healthy individuals (aged 8-30y).
• Classified participants into four pubertal stages: pre-, early-, late-, and post-puberty.
• Quantified T-cell subtypes (CD4, CD8, TCRγδ) in peripheral blood via flow cytometry.

Main Results:

• Absolute counts of naive CD4 T-cells and recent thymic emigrant CD4 T-cells decreased with puberty (p=0.004, p=0.015).
• Absolute CD4 effector memory cell counts increased during puberty (p=0.002).
• Early-pubertal individuals had higher naive CD4 T-cell counts than post-pubertal individuals, independent of aging (p=0.19).

Conclusions:

• Pubertal maturation drives a significant developmental shift in T-cell composition.
• The immune system transitions from a naive T-cell profile to a more mature phenotype during puberty.
• These T-cell changes during puberty may underlie altered immune responses and transplant outcomes in adolescents.