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Zhou M, Dascani P, Ding C, Kos JT, Tieri D, Lin X, Caster D, Powell D, Wen C, Watson CT, Yan J. Integrin CD11b Negatively Regulates B Cell Receptor Signaling to Shape Humoral Response during Immunization and Autoimmunity. THE JOURNAL OF IMMUNOLOGY 2021; 207:1785-1797. [PMID: 34470858 DOI: 10.4049/jimmunol.2100070] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 07/29/2021] [Indexed: 11/19/2022]
Abstract
Our previous work has revealed the ability of CD11b to regulate BCR signaling and control autoimmune disease in mice. However, how CD11b regulates the immune response under normal conditions remains unknown. Through the use of a CD11b knockout model on a nonautoimmune background, we demonstrated that CD11b-deficient mice have an elevated Ag-specific humoral response on immunization. Deletion of CD11b resulted in elevated low-affinity and high-affinity IgG Ab and increases in Ag-specific germinal center B cells and plasma cells (PCs). Examination of BCR signaling in CD11b-deficient mice revealed defects in association of negative regulators pLyn and CD22 with the BCR, but increases in colocalizations between positive regulator pSyk and BCR after stimulation. Using a CD11b-reporter mouse model, we identified multiple novel CD11b-expressing B cell subsets that are dynamically altered during immunization. Subsequent experiments using a cell-specific CD11b deletion model revealed this effect to be B cell intrinsic and not altered by myeloid cell CD11b expression. Importantly, CD11b expression on PCs also impacts on BCR repertoire selection and diversity in autoimmunity. These studies describe a novel role for CD11b in regulation of the healthy humoral response and autoimmunity, and reveal previously unknown populations of CD11b-expressing B cell subsets, suggesting a complex function for CD11b in B cells during development and activation.
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Affiliation(s)
- Mingqian Zhou
- Division of Immunotherapy, The Hiram C. Polk, Jr. Department of Surgery, Immuno-Oncology Program, James Graham Brown Cancer Center, University of Louisville School of Medicine, Louisville, KY.,College of Basic Medical Sciences, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Paul Dascani
- Department of Microbiology and Immunology, University of Louisville School of Medicine, Louisville, KY
| | - Chuanlin Ding
- Division of Immunotherapy, The Hiram C. Polk, Jr. Department of Surgery, Immuno-Oncology Program, James Graham Brown Cancer Center, University of Louisville School of Medicine, Louisville, KY
| | - Justin T Kos
- Department of Biochemistry and Molecular Genetics, University of Louisville, Louisville, KY; and
| | - David Tieri
- Department of Biochemistry and Molecular Genetics, University of Louisville, Louisville, KY; and
| | - Xiaoying Lin
- Division of Immunotherapy, The Hiram C. Polk, Jr. Department of Surgery, Immuno-Oncology Program, James Graham Brown Cancer Center, University of Louisville School of Medicine, Louisville, KY.,College of Basic Medical Sciences, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Dawn Caster
- Department of Medicine, University of Louisville, Louisville, KY
| | - David Powell
- Department of Medicine, University of Louisville, Louisville, KY
| | - Chengping Wen
- College of Basic Medical Sciences, Zhejiang Chinese Medical University, Hangzhou, Zhejiang, China
| | - Corey T Watson
- Department of Biochemistry and Molecular Genetics, University of Louisville, Louisville, KY; and
| | - Jun Yan
- Division of Immunotherapy, The Hiram C. Polk, Jr. Department of Surgery, Immuno-Oncology Program, James Graham Brown Cancer Center, University of Louisville School of Medicine, Louisville, KY; .,Department of Microbiology and Immunology, University of Louisville School of Medicine, Louisville, KY
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Gold MR, Reth MG. Antigen Receptor Function in the Context of the Nanoscale Organization of the B Cell Membrane. Annu Rev Immunol 2019; 37:97-123. [DOI: 10.1146/annurev-immunol-042718-041704] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The B cell antigen receptor (BCR) plays a central role in the self/nonself selection of B lymphocytes and in their activation by cognate antigen during the clonal selection process. It was long thought that most cell surface receptors, including the BCR, were freely diffusing and randomly distributed. Since the advent of superresolution techniques, it has become clear that the plasma membrane is compartmentalized and highly organized at the nanometer scale. Hence, a complete understanding of the precise conformation and activation mechanism of the BCR must take into account the organization of the B cell plasma membrane. We review here the recent literature on the nanoscale organization of the lymphocyte membrane and discuss how this new information influences our view of the conformational changes that the BCR undergoes during activation.
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Affiliation(s)
- Michael R. Gold
- Department of Microbiology and Immunology, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
- Life Sciences Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
| | - Michael G. Reth
- BIOSS Centre for Biological Signaling Studies, University of Freiburg, 79104 Freiburg, Germany
- Department of Molecular Immunology, Institute of Biology III, Faculty of Biology, University of Freiburg, 79108 Freiburg, Germany
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