Nanoparticle-Delivered siRNA Targeting NSUN4 Relieves Systemic Lupus Erythematosus through Declining Mitophagy-Mediated CD8+T Cell Exhaustion
Bincheng Ren , Kaini He , Ning Wei , Shanshan Liu , Xiaoguang Cui , Xin Yang , Xiaojing Cheng , Tian Tian , Ru Gu , Xueyi Li
MedComm ›› 2025, Vol. 6 ›› Issue (8) : e70311
Nanoparticle-Delivered siRNA Targeting NSUN4 Relieves Systemic Lupus Erythematosus through Declining Mitophagy-Mediated CD8+T Cell Exhaustion
5-Methylcytosine modification (m5C) is an important posttranscriptional regulatory mechanism of gene expression. Exhausted CD8+T cells contribute to the development of many major diseases; however, their exact role and relationship to m5C in systemic lupus erythematosus (SLE) remain unknown. In this study, we identified a CD7highCD74high CD8+T subgroup that were robustly expanded in SLE patients through single-cell transcriptome sequencing (scRNA-seq). CD7highCD74high CD8+T cells displayed exhausted features and exhibited a superior diagnostic value in SLE. Then, we explored the m5C landscape of SLE patients by performing m5C epitranscriptome sequencing (m5C-seq). ScRNA-seq and m5C-seq were conjointly analyzed to screen m5C-related therapeutic targets for SLE, and NOP2/Sun RNA methyltransferase 4 (NSUN4) was identified as a key regulator of SLE pathogenesis. Knockdown of NSUN4 downregulated CD74 expression via reduction of m5C and suppressed CD8+T cell exhaustion by declining CD44/mTOR (mechanistic target of rapamycin kinase)-mediated mitophagy. Finally, we verified that nanoparticle-delivered siRNA against Nusn4 decreased autoimmune reaction kidney damage in both spontaneous and pristane-induced SLE mouse models. In conclusion, we identify an exhausted CD7highCD74high CD8+T cell subset and propose the crucial role of NSUN4/CD74-induced dysregulation of mitophagy in SLE pathogenesis, and targeting NSUN4 is a promising treatment strategy for SLE patients.
CD8+T cell mitophagy and exhaustion / nanoparticle-delivered siRNA / NSUN4 / single-cell RNA sequencing and m5C sequencing / systemic lupus erythematosus
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2025 The Author(s). MedComm published by Sichuan International Medical Exchange & Promotion Association (SCIMEA) and John Wiley & Sons Australia, Ltd.
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