当前位置： SCI文献检索 > REJUVENATION RESEARCH期刊下所有文献 > Homeostatic cytokines and expansion of regulatory T cells accompany thymic impairment in children with Down syndrome.

Homeostatic cytokines and expansion of regulatory T cells accompany thymic impairment in children with Down syndrome.

Abstract：

:Down syndrome (DS), the most common chromosomal abnormality in humans, is characterized by precocious immunologic aging that results, among other things, in alterations of B and T lymphocyte subsets and natural killer cells, defective phagocytosis, and chemotaxis of polymorphonuclear leukocytes. We studied 30 children affected by DS, compared them to 29 healthy controls, and evaluated the functionality of the thymus (by measuring the amount of lymphocytes that express the signal-joint T cell receptor rearrangement excision circles [sj-TREC+]), the plasma levels of interleukin (IL)-7 and IL-15, the proliferative T cell response to these cytokines, the expression of the alpha chain of the IL-7 receptor (CD127), the extrathymic differentiation of T lymphocytes, and the presence of natural regulatory T cells (Tregs) in peripheral blood. We found that DS children had a significantly lower number of sj-TREC+ lymphocytes, the levels of which were strongly correlated with age. We found higher plasma levels of IL-7 and IL-15 than in healthy controls, and a higher proliferative T cell response to IL-15. DS children also showed a lower percentage of CD4(+) cells and profound alterations of T cell differentiation, along with increased amount of Tregs and of cells expressing markers of apoptosis. We can thus hypothesize that the precocious thymic involution occurring in DS is mirrored by a high production of IL-7 and IL-15, which is crucial for cell survival and proliferation. The complex alterations present in the periphery are likely the result of a compensatory mechanism: the overproduction of homeostatic cytokines could be a reaction to the impaired intrathymic production of T lymphocytes and/or to the expansion of Treg in the periphery, and could be required to allow the survival of T cells.

journal_name

Rejuvenation Res

journal_title

Rejuvenation research

authors

Roat E,Prada N,Lugli E,Nasi M,Ferraresi R,Troiano L,Giovenzana C,Pinti M,Biagioni O,Mariotti M,Di Iorio A,Consolo U,Balli F,Cossarizza A

doi

10.1089/rej.2007.0648

subject

Has Abstract

pub_date

2008-06-01 00:00:00

pages

573-83

issue

eissn

1549-1684

issn

1557-8577

journal_volume

pub_type

杂志文章

在线工具

Homeostatic cytokines and expansion of regulatory T cells accompany thymic impairment in children with Down syndrome.