B Cell Subsets and Dysfunction of Regulatory B Cells in IgG4-related Diseases and Primary Sjögren's Syndrome: the Similarities and Differences
Overview
Authors
Affiliations
Introduction: IgG4-related disease (IgG4-RD) is a multisystem-involved autoimmune disease. Abnormally activated and differentiated B cells may play important roles. Regulatory B cells (Breg) are newly defined B cell subgroups with immunosuppressive functions. In this study, we investigated the differences of B cell subsets, the expressions of co-stimulatory molecules on B cells, and the function of Breg cells in patients with IgG4-RD, primary Sjögren's syndrome (pSS) as well as in healthy controls (HC).
Methods: Newly diagnosed IgG4-RD patients (n = 48) were enrolled, 38 untreated pSS patients and 30 healthy volunteers were recruited as disease and healthy controls. To analyze B cell subsets and B cell activity, PBMCs were surface stained and detected by flow cytometry. The function of Breg cells was tested by coculturing isolated CD19 + CD24(hi)CD38(hi) Breg cells with purified CD4 + CD25- T cells. Serum cytokines were measured by ELISA and cytometric bead array. Relationship between clinical data and laboratory findings were analyzed as well.
Results: Compared with pSS patients and HC, IgG4-RD patients had a lower frequency of peripheral Breg cells. Interestingly, CD19 + CD24-CD38(hi) B cell subsets were significantly higher in peripheral B cells from IgG4-RD patients than in pSS patients and HC, which correlated with serum IgG4 levels. The expression of BAFF-R and CD40 on B cells was significantly lower in IgG4-RD patients compared with those in pSS patients and HC. Unlike HC, Breg cells from pSS patients lacked suppressive functions.
Conclusions: B cells in patients with IgG4-RD and pSS display a variety of abnormalities, including disturbed B cell subpopulations, abnormal expression of key signaling molecules, co-stimulatory molecules, and inflammatory cytokines. In addition, a significantly increased B cell subset, CD19 + CD24-CD38(hi) B cells, may play an important role in the pathogenesis of IgG4-RD.
The role of autoantibodies in bridging obesity, aging, and immunosenescence.
Valentino T, Chen N, Makhijani P, Khan S, Winer S, Revelo X Immun Ageing. 2024; 21(1):85.
PMID: 39616399 PMC: 11607830. DOI: 10.1186/s12979-024-00489-2.
Allen E, Penkert R, Hankins J, Surman S, Van de Velde L, Cotton A Vaccines (Basel). 2024; 12(9).
PMID: 39340016 PMC: 11435734. DOI: 10.3390/vaccines12090984.
Chen J, Liu Y, Zhan P, Gao T, Zuo J, Li X Sex Med. 2024; 12(4):qfae062.
PMID: 39315306 PMC: 11416910. DOI: 10.1093/sexmed/qfae062.
Xing Y, Li B, Wei P, Hua H J Dent Sci. 2024; 19(3):1554-1563.
PMID: 39035330 PMC: 11259624. DOI: 10.1016/j.jds.2023.12.024.
Viral DNA in submandibular gland tissue with an inflammatory disorder.
Keski-Santti N, Waltimo E, Makitie A, Hagstrom J, Soderlund-Venermo M, Atula T J Oral Microbiol. 2024; 16(1):2345941.
PMID: 38711909 PMC: 11073405. DOI: 10.1080/20002297.2024.2345941.