The Multifaceted Roles of B Cells: From Antibody Secretion to Cytokine-Mediated Immune Regulatory Networks

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This article systematically elucidates the multifaceted roles of B cells in antibody-independent functions, focusing on their secretion of various cytokines to participate in secondary lymphoid organ development, regulation of CD4+ T cell responses, and immune negative regulation. It analyzes the critical contributions of B cell-derived cytokines such as lymphotoxin, IL-6, IFN-γ, GM-CSF, and IL-10 in maintaining tissue homeostasis and modulating inflammatory responses.

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The Multifaceted Roles of B Cells: From Antibody Secretion to Cytokine-Mediated Immune Regulatory Networks

Abstract
This article focuses on the central role of B cells in antibody-independent functions, systematically elaborating their multi-layered roles in secondary lymphoid organ development, CD4⁺ T cell response regulation, and immune negative regulation through the secretion of various cytokines. It analyzes the key contributions of B cell-derived cytokines such as lymphotoxin, IL-6, IFN-γ, GM-CSF, and IL-10 in tissue homeostasis and inflammatory regulation.

I. Traditional and Expanded Understanding of B Cell Functions

B cells are a core component of the adaptive immune system, with their most classic function being differentiation into plasma cells and secretion of specific antibodies to mediate humoral immune responses. However, the functions of B cells extend far beyond this. As professional antigen-presenting cells, B cells can efficiently uptake antigens via B cell receptors and present them to T cells, participating in T cell activation. More importantly, B cells are also a significant source of various cytokines. Through these cytokines, B cells play an irreplaceable regulatory role in secondary lymphoid organ development, T cell response polarization, inflammatory regulation, and tissue repair.

II. The Critical Role of B Cells in Lymphoid Tissue Development and Remodeling

The normal development of secondary lymphoid organs (including the spleen, lymph nodes, and Peyer's patches) relies on signal interactions between lymphoid tissue inducer cells and stromal cells, with B cells playing an indispensable role in this process. B cells provide lymphotoxin α1β2 (LTα1β2) and tumor necrosis factor, driving the development of follicular dendritic cells and the formation of T cell zone stroma. In the spleen, B cells are the first lymphocytes to colonize, and the LTα1β2 and TNF they provide are essential for FDC development. B cells also play a crucial role in the maturation of Peyer's patches and isolated lymphoid follicles, with mechanisms differing from those in the spleen. B cells express TNF rather than LTα1β2. In the formation of tertiary lymphoid tissues, LTα1β2-expressing B cells localized at ectopic sites are sufficient to trigger the formation of lymphoid structures with organized B and T cell zones. In tissue repair, B cells play a key role in mouse prostate regeneration by providing LTα1β2.

III. Regulation of Effector CD4⁺ T Cell Responses by B Cell-Derived Cytokines

B cells profoundly influence the differentiation and function of CD4⁺ T cells through the secretion of various cytokines. In terms of pro-inflammatory cytokine secretion, B cells promote Th1 cell differentiation via TNF and CCL3, while IFN-γ-producing B cells support Th1 and macrophage responses, and GM-CSF-producing B cells enhance dendritic cell IL-12 production. In humoral immune support, B cell-derived IL-2 supports Th2 cell responses and memory formation, while IL-6 supports TFH, Th1, and Th17 cell responses. Additionally, in specific infection models, B cell-derived IL-17 can promote the accumulation of IL-10-producing neutrophils, suggesting that B cells may indirectly influence the inflammatory regulatory functions of innate immune cells through cytokine networks.

IV. Immune Negative Regulatory Functions of B Cells

B cells exert negative regulatory effects in various inflammatory and autoimmune diseases by secreting inhibitory cytokines such as IL-10 and IL-35. Regulatory B cells are the primary source of these inhibitory cytokines, suppressing pathogenic T cell responses through IL-10-dependent or independent mechanisms. In experimental autoimmune encephalomyelitis, CD1dhi B cells activated in vitro produce IL-10 and protect mice from EAE in an IL-10-dependent manner upon adoptive transfer. Under co-stimulation of BCR and CD40 signals, naive B cells can express IL-35, a heterodimeric cytokine closely associated with immune suppression.

V. Conclusion

As multifunctional regulators of the immune system, B cells have far surpassed the traditional scope of antibody-secreting cells. Through LTα1β2 and TNF, B cells participate in the development and remodeling of lymphoid tissues. Through cytokines such as IL-6, IFN-γ, and GM-CSF, they regulate the polarization and memory formation of CD4⁺ T cell responses. Through IL-10 and IL-35, they mediate immune negative regulation to limit excessive inflammation, also playing significant roles in tissue repair and the tumor microenvironment. A deeper understanding of the B cell-derived cytokine network will provide new theoretical foundations and intervention strategies for autoimmune diseases, inflammatory diseases, and vaccine development.

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This article is reviewed and published by the technical expert team of UA

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