Role of CD4+NKG2D+ T cells in the disease activity of juvenile idiopathic arthritis

WANG Jun-Yan; ZHU Xiao-Ping; ZHANG Yu; LUO Chong; TANG Xue-Mei; ZHOU Juan

doi:10.7499/j.issn.1008-8830.2208103

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Chinese Journal of Contemporary Pediatrics ›› 2023, Vol. 25 ›› Issue (2) : 166-171. DOI: 10.7499/j.issn.1008-8830.2208103

CLINICAL RESEARCH

Role of CD4⁺NKG2D⁺ T cells in the disease activity of juvenile idiopathic arthritis

WANG Jun-Yan, ZHU Xiao-Ping, ZHANG Yu, LUO Chong, TANG Xue-Mei, ZHOU Juan

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Abstract

Objective To study the expression levels of CD4⁺NKG2D⁺ T cells and NKG2D soluble ligands, the soluble MHC class I chain-related molecules A and B (sMICA/sMICB) in the active stage and stable stage of juvenile idiopathic arthritis (JIA) and their role in the disease activity of JIA. Methods Nineteen children with systemic JIA and 20 children with articular JIA who were diagnosed in Children's Hospital of Chongqing Medical University from November 2019 to December 2021 were enrolled in this prospective study. Six healthy children were enrolled as the control group. After peripheral blood samples were collected, ELISA was used to measure the levels of sMICA and sMICB, and flow cytometry was used to measure the percentage of CD4⁺NKG2D⁺ T cells. Systemic Juvenile Arthritis Disease Activity Score-27 (sJADAS-27)/Juvenile Arthritis Disease Activity Score-27 (JADAS-27) was used to evaluate the disease activity in children with JIA. The Pearson correlation analysis and the receiver operating characteristic (ROC) curve were used to assess the role of CD4⁺NKG2D⁺ T cells, sMICA and sMICB in the disease activity of JIA. Results The active systemic JIA and active articular JIA groups had a significant increase in the percentage of CD4⁺NKG2D⁺ T cells compared with the control group and their corresponding inactive JIA group (P<0.05). The JIA groups had significantly higher levels of sMICA and sMICB than the control group (P<0.05), and the active articular JIA group had a significantly higher level of sMICB than the stable articular JIA group (P<0.05). In the children with JIA, the percentage of CD4⁺NKG2D⁺ T cells and the levels of sMICA and sMICB were positively correlated with sJADAS-27/JADAS-27 disease activity scores (P<0.05). The ROC curve analysis showed that sMICB had an area under the curve of 0.755 in evaluating the disease activity of JIA, with a specificity of 0.90 and a sensitivity of 0.64. Conclusions The percentage of CD4⁺NKG2D⁺ T cells and the levels of sMICA and sMICB increase in children with JIA compared with healthy children and are positively correlated with the disease activity of JIA, suggesting that CD4⁺NKG2D⁺ T cells and NKG2D ligands can be used as potential biomarkers for evaluating the disease activity of JIA.

Key words

Juvenile idiopathic arthritis / Natural-killer group 2 member D / Disease activity / Child

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WANG Jun-Yan, ZHU Xiao-Ping, ZHANG Yu, LUO Chong, TANG Xue-Mei, ZHOU Juan. Role of CD4⁺NKG2D⁺ T cells in the disease activity of juvenile idiopathic arthritis[J]. Chinese Journal of Contemporary Pediatrics. 2023, 25(2): 166-171 https://doi.org/10.7499/j.issn.1008-8830.2208103

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