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Effect of aging on the expression of CD4+CD25+Foxp3+ regulatory T cells, CD4+T cells and cytokines in peripheral blood
YANG Xiang, WAN Wen-hui, GONG Ge, ZHANG Yuan, CHEN Yang-xi, LIU Yu, ZHANG Xing-hu, LUO Jie, LI Han-qing
2021, 35 (4):
354-357.
doi: 10.3969/j.issn.1003-9198.2021.04.009
Objective To investigate the effects of aging on the expression of CD4+CD25+Foxp3+ regulatory T cells (Treg), CD4+T cells in human peripheral blood and the levels of cytokines. Methods The absolute counts of CD4+T cells and CD4+CD25+Foxp3+ Treg, and the levels of interleukin-2 (IL-2), interferon-γ (IFN-γ), tumor necrosis factor-α (TNF-α), IL-10 and IL-17 were measured respectively in peripheral blood of 40 young persons (20-45 years old), 40 middle-aged persons (50-75 years old) and 40 elderly persons (above 80 years old), and also the percentage of CD4+CD25+Foxp3+Treg in CD4+T cells in peripheral blood of the three groups was calculated. The differences among the three groups were compared. Results The absolute count of CD4+T cells in peripheral blood decreased significantly in the elderly group than those in the young group and the middle-aged group(P<0. 05). The absolute count of CD4+CD25+Foxp3+Treg was significantly higher in peripheral blood in the elderly group and the middle-aged group than that in the young group(P<0. 05). The percentage of CD4+CD25+Foxp3+Treg in CD4+T cells was the highest in the elderly group, followed by the middle-aged group and the young group (P<0. 05). The levels of IL-2, IFN-γ and IL-17 in the elderly group were significantly lower than those in the young group and the middle-aged group (P<0. 05), and the level of IL-2 in the middle-aged group was significantly lower than that in the young group (P<0. 05). The level of IL-10 in the elderly group was significantly higher than that in the young group and the middle-aged group (P<0. 05), and the level of TNF-α among the three groups showed no significant difference (P>0. 05). Conclusions The absolute count of CD4+CD25+Foxp3+Treg in peripheral blood increases significantly after middle-age. With the increase of age, the ratio of CD4+CD25+Foxp3+Treg/CD4+T cells increases significantly. In the elderly, the absolute count of CD4+T cells and the levels of IL-2, IFN-γ, IL-17 decrease significantly, while the level of IL-10 significantly increases, indicating that the immune function of the elderly further decreases and the microenvironment is changed.
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