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Fike AJ, Chodisetti SB, Wright NE, Bricker KN, Domeier PP, Maienschein-Cline M, Rosenfeld AM, Luckenbill SA, Weber JL, Choi NM, Luning Prak ET, Mandal M, Clark MR, Rahman ZSM. STAT3 signaling in B cells controls germinal center zone organization and recycling. Cell Rep 2023; 42:112512. [PMID: 37200190 PMCID: PMC10311431 DOI: 10.1016/j.celrep.2023.112512] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 03/05/2023] [Accepted: 05/01/2023] [Indexed: 05/20/2023] Open
Abstract
Germinal centers (GCs), sites of antibody affinity maturation, are organized into dark (DZ) and light (LZ) zones. Here, we show a B cell-intrinsic role for signal transducer and activator of transcription 3 (STAT3) in GC DZ and LZ organization. Altered zonal organization of STAT3-deficient GCs dampens development of long-lived plasma cells (LL-PCs) but increases memory B cells (MBCs). In an abundant antigenic environment, achieved here by prime-boost immunization, STAT3 is not required for GC initiation, maintenance, or proliferation but is important for sustaining GC zonal organization by regulating GC B cell recycling. Th cell-derived signals drive STAT3 tyrosine 705 and serine 727 phosphorylation in LZ B cells, regulating their recycling into the DZ. RNA sequencing (RNA-seq) and chromatin immunoprecipitation sequencing (ChIP-seq) analyses identified STAT3 regulated genes that are critical for LZ cell recycling and transiting through DZ proliferation and differentiation phases. Thus, STAT3 signaling in B cells controls GC zone organization and recycling, and GC egress of PCs, but negatively regulates MBC output.
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Affiliation(s)
- Adam J Fike
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Sathi Babu Chodisetti
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Nathaniel E Wright
- Department of Medicine, Section of Rheumatology and Gwen Knapp Center for Lupus and Immunology Research, University of Chicago, Chicago, IL 60637, USA
| | - Kristen N Bricker
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Phillip P Domeier
- Center for Fundamental Immunology, Benaroya Research Institute, Seattle, WA 98101, USA
| | | | - Aaron M Rosenfeld
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Sara A Luckenbill
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Julia L Weber
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Nicholas M Choi
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA
| | - Eline T Luning Prak
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Malay Mandal
- Department of Medicine, Section of Rheumatology and Gwen Knapp Center for Lupus and Immunology Research, University of Chicago, Chicago, IL 60637, USA
| | - Marcus R Clark
- Department of Medicine, Section of Rheumatology and Gwen Knapp Center for Lupus and Immunology Research, University of Chicago, Chicago, IL 60637, USA
| | - Ziaur S M Rahman
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA 17033, USA.
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Schell SL, Bricker KN, Fike AJ, Chodisetti SB, Domeier PP, Choi NM, Fasnacht MJ, Luckenbill SA, Ziegler SF, Rahman ZSM. Context-Dependent miR-21 Regulation of TLR7-Mediated Autoimmune and Foreign Antigen-Driven Antibody-Forming Cell and Germinal Center Responses. J Immunol 2021; 206:2803-2818. [PMID: 34039637 DOI: 10.4049/jimmunol.2001039] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Accepted: 04/01/2021] [Indexed: 01/03/2023]
Abstract
MicroRNAs (miRNAs) are involved in healthy B cell responses and the loss of tolerance in systemic lupus erythematosus (SLE), although the role of many miRNAs remains poorly understood. Dampening miR-21 activity was previously shown to reduce splenomegaly and blood urea nitrogen levels in SLE-prone mice, but the detailed cellular responses and mechanism of action remains unexplored. In this study, using the TLR7 agonist, imiquimod-induced SLE model, we observed that loss of miR-21 in Sle1b mice prevented the formation of plasma cells and autoantibody-producing Ab-forming cells (AFCs) without a significant effect on the magnitude of the germinal center (GC) response. We further observed reduced dendritic cell and monocyte numbers in the spleens of miR-21-deficient Sle1b mice that were associated with reduced IFN, proinflammatory cytokines, and effector CD4+ T cell responses. RNA sequencing analysis on B cells from miR-21-deficient Sle1b mice revealed reduced activation and response to IFN, and cytokine and target array analysis revealed modulation of numerous miR-21 target genes in response to TLR7 activation and type I IFN stimulation. Our findings in the B6.Sle1bYaa (Sle1b Yaa) spontaneous model recapitulated the miR-21 role in TLR7-induced responses with an additional role in autoimmune GC and T follicular helper responses. Finally, immunization with T-dependent Ag revealed a role for miR-21 in foreign Ag-driven GC and Ab, but not AFC, responses. Our data suggest a potential multifaceted, context-dependent role for miR-21 in autoimmune and foreign Ag-driven AFC and GC responses. Further study is warranted to delineate the cell-intrinsic requirements and mechanisms of miR-21 during infection and SLE development.
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Affiliation(s)
- Stephanie L Schell
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA; and
| | - Kristen N Bricker
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA; and
| | - Adam J Fike
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA; and
| | - Sathi Babu Chodisetti
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA; and
| | | | - Nicholas M Choi
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA; and
| | - Melinda J Fasnacht
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA; and
| | - Sara A Luckenbill
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA; and
| | | | - Ziaur S M Rahman
- Department of Microbiology and Immunology, Pennsylvania State University College of Medicine, Hershey, PA; and
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