AUTHOR=Lu Fang , Chen Si , Guo Honglei , Li Qing , Wu Lin , Pan Ying , Wu Yangfan , Shu Hua , Liu Simeng , Zhang Bo , Mao Huijuan , Xing Changying , Liang Hongwei , Duan Suyan , Yuan Yanggang 

TITLE=Exploring immunological alterations of B cells in peripheral immunity via single-cell RNA sequencing: insights into primary membranous nephropathy

JOURNAL=Frontiers in Immunology

VOLUME=Volume 16 - 2025

YEAR=2025

URL=https://www.frontiersin.org/journals/immunology/articles/10.3389/fimmu.2025.1622395

DOI=10.3389/fimmu.2025.1622395

ISSN=1664-3224

ABSTRACT=BackgroundPrimary Membranous Nephropathy (PMN) is characterized by dysregulated immune responses, with B cells playing critical roles in disease pathogenesis. However, the immunopathogenic mechanisms underlying B cell involvement in PMN remain elusive.MethodsWe employed single-cell RNA sequencing on peripheral blood mononuclear cell samples (PBMC) obtained from 6 patients with PMN and 3 healthy controls (NC) to explore the transformation of B cells and their interaction with immune cells.ResultsCompared with NC, the most significant alterations were in plasma cells and regulatory B (Breg) cells in PMN patients. Within plasma cells, Subcluster 0 was increased in PMN patients and exhibited enhanced autoimmunity. Breg subset B10 cells were elevated in PMN patients and displayed increased immune regulatory capacity, marked by enhanced cytokine and interleukin-10 production. B cell activating factor (BAFF) and galectin-9, which were secreted by CD14 monocyte, as potential regulators of plasma and Breg cells activity. Additionally, serum galectin-9 levels increased in PMN patients and showed a correlation with proteinuria and renal function in PMN.ConclusionsWe reveal novel insights into the heterogeneity and functional diversity of B cells in patients with PMN. And revealed distinct roles for subgroup 0 plasma cells and B10 Breg cells in the pathogenesis of PMN. Furthermore, targeting B cells, such as galectin-9, presents promising opportunities for modulating the immune response in patients with PMN.