Overexpression of Lymphocyte Activation Gene-3 Inhibits Regulatory T Cell Responses in Osteoarthritis

被引:19
作者
Xia, Junjie [1 ]
Ni, Zhiming [1 ]
Wang, Jian [2 ]
Zhu, Shu [1 ]
Ye, Hong [1 ]
机构
[1] PLA, Dept Orthoped, Hosp 117, 14 Lingyin Rd, Hangzhou 310013, Zhejiang, Peoples R China
[2] Pudong New Area Peoples Hosp, Dept Orthoped, Shanghai, Peoples R China
关键词
IL-10; LAG-3; regulatory T cell; osteoarthritis; EFFECTOR FUNCTION; SELF-TOLERANCE; IN-VITRO; LAG-3; EXPRESSION; DISEASE; CANCER; INFLAMMATION; RECEPTORS; PROTEIN;
D O I
10.1089/dna.2017.3771
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Lymphocyte activation gene-3 (LAG-3) is a CD4 homologue expressed on the surface of activated conventional T cells and regulatory T (Treg) cells. In conventional T cells, LAG-3 acts as an inhibitory receptor of T cell inflammation. However, the role of LAG-3 in Treg cells remains controversial. In this study, we investigated the effect of LAG-3 on Tregs in osteoarthritis (OA). We observed that the proportion of LAG-3-expressing cells in CD4(+)CD25(+/high) T cells and Foxp3(+)CD4(+)CD25(+/high) T cells were significantly upregulated in OA patients. The level of LAG-3-to-Foxp3 ratio was further increased in synovial fluid. Several aspects of Treg responses in LAG-3(+) and LAG-3(-) Treg cells were then examined. First, LAG-3(+) Treg cells demonstrated significantly lower proliferation than LAG-3(-) Treg cells. Second, the increase in interleukin (IL)-10 and transforming growth factor (TGF)- expression was significantly lower in LAG-3(+) Treg cells than that in LAG-3(-) Treg cells. Third, LAG-3(+) Treg cells were less capable of inhibiting the proliferation of CD4(+)CD25(-) conventional T cells than LAG-3(-) Treg cells. This study suggests that Treg cells in OA may be enriched with a LAG-3-expressing population that exhibits functional impairment, which limits their capacity in suppressing inflammation.
引用
收藏
页码:862 / 869
页数:8
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