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Chen, Wei; Jin, Bei; Cheng, Cheng; Peng, Huajing; Zhang, Xinxin; Tan, Weiping; Tang, Ruihan; Lian, Xingji; Diao, Hui; Luo, Ning; Li, Xiaoyan; Fan, Jinjin; Shi, Jian; Yin, Changjun; Wang, Ji; Peng, Sui; Yu, Li; Li, Jun; Wu, Rui-Qi; Kuang, Dong-Ming; Shi, Guo-Ping; Zhou, Yi; Wang, Fang; Jiang, Xiaoyun
Annals of the rheumatic diseases, 05/2024, Volume: 83, Issue: 5Journal Article
The current work aimed to provide a comprehensive single-cell landscape of lupus nephritis (LN) kidneys, including immune and non-immune cells, identify disease-associated cell populations and unravel their participation within the kidney microenvironment. Single-cell RNA and T cell receptor sequencing were performed on renal biopsy tissues from 40 patients with LN and 6 healthy donors as controls. Matched peripheral blood samples from seven LN patients were also sequenced. Multiplex immunohistochemical analysis was performed on an independent cohort of 60 patients and validated using flow cytometric characterisation of human kidney tissues and in vitro assays. We uncovered a notable enrichment of CD163 dendritic cells (DC3s) in LN kidneys, which exhibited a positive correlation with the severity of LN. In contrast to their counterparts in blood, DC3s in LN kidney displayed activated and highly proinflammatory phenotype. DC3s showed strong interactions with CD4 T cells, contributing to intrarenal T cell clonal expansion, activation of CD4 effector T cell and polarisation towards Th1/Th17. Injured proximal tubular epithelial cells (iPTECs) may orchestrate DC3 activation, adhesion and recruitment within the LN kidneys. In cultures, blood DC3s treated with iPTECs acquired distinct capabilities to polarise Th1/Th17 cells. Remarkably, the enumeration of kidney DC3s might be a potential biomarker for induction treatment response in LN patients. The intricate interplay involving DC3s, T cells and tubular epithelial cells within kidneys may substantially contribute to LN pathogenesis. The enumeration of renal DC3 holds potential as a valuable stratification feature for guiding LN patient treatment decisions in clinical practice.
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