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Sex- and age-specific aspects of human peripheral T-cell dynamics

Journal Article · · Frontiers in Immunology
Background: The diversity of the antigenic T cell receptor (TCR) repertoire clonally expressed on T lymphocytes is a key element of the adaptive immune system protective functions. A decline in diversity in the older adults is associated with health deterioration. This diversity is generated by the rearrangement of TRB genes coding for TCR chains during lymphocyte differentiation in the thymus, but is essentially maintained by peripheral T lymphocytes proliferation for most of life. Deep sequencing of rearranged TRB genes from blood cells allows the monitoring of peripheral T cell repertoire dynamics. We analysed two aspects of rearranged TRB diversity, related to T lymphocyte proliferation and to the distribution of the T cell clone size, in a collection of repertoires obtained from 1 to 74 years-old donors. Results: Our results show that peripheral T lymphocytes expansion differs according to the recombination status of their TRB loci. Their proliferation rate changes with age, with different patterns in men and women. T cell clone size becomes more heterogeneous with time, and, in adults, is always more even in women. Importantly, a longitudinal analysis of TRB repertoires obtained at ten years intervals from individual men and women confirms the findings of this cross-sectional study. Conclusions: Peripheral T lymphocyte proliferation partially depends on their thymic developmental history. The rate of proliferation of T cells differing in their TRB rearrangement status is different in men and women before the age of 18 years old, but similar thereafter.
Research Organization:
Radiation Effects Research Foundation (RERF), Hiroshima (Japan)
Sponsoring Organization:
European Social Fund; LABEX PRIMES; Silesian University of Technology; USDOE
OSTI ID:
2470356
Journal Information:
Frontiers in Immunology, Journal Name: Frontiers in Immunology Vol. 14; ISSN 1664-3224
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English

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