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King JK, Tran TM, Paing MH, Yin Y, Jaiswal AK, Tso CH, Roy K, Casero D, Rao DS. Regulation of T-independent B-cell responses by microRNA-146a. Front Immunol 2022; 13:984302. [PMID: 36172375 PMCID: PMC9511149 DOI: 10.3389/fimmu.2022.984302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 08/19/2022] [Indexed: 11/18/2022] Open
Abstract
The microRNA, miR-146a, is a negative feedback regulator of the central immune transcription factor, nuclear factor kappa B (NFkB). MiR-146a plays important roles in the immune system, and miR-146a deficient mice show a complex phenotype with features of chronic inflammation and autoimmune disease. In this study, we examined the role of miR-146a in extrafollicular B-cell responses, finding that miR-146a suppresses cellular responses in vivo and in vitro. Gene expression profiling revealed that miR-146a-deficient B-cells showed upregulation of interferon pathway genes, including Traf6, a known miR-146a target. We next interrogated the role of TRAF6 in these B-cell responses, finding that TRAF6 is required for proliferation by genetic and pharmacologic inhibition. Together, our findings demonstrate a novel role for miR-146a and TRAF6 in the extrafollicular B-cell responses, which have recently been tied to autoimmune disease pathogenesis. Our work highlights the pathogenetic role of miR-146a and the potential of pharmacologic inhibition of TRAF6 in autoimmune diseases in which miR-146a is deregulated.
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Affiliation(s)
- Jennifer K. King
- Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, CA, United States
| | - Tiffany M. Tran
- Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, CA, United States
| | - May H. Paing
- Department of Medicine, David Geffen School of Medicine, University of California Los Angeles, CA, United States
| | - Yuxin Yin
- Department of Pathology & Laboratory Medicine, David Geffen School of Medicine, University of California Los Angeles, CA, United States
| | - Amit K. Jaiswal
- Department of Pathology & Laboratory Medicine, David Geffen School of Medicine, University of California Los Angeles, CA, United States
| | - Ching-Hsuan Tso
- Department of Pathology & Laboratory Medicine, David Geffen School of Medicine, University of California Los Angeles, CA, United States
| | - Koushik Roy
- Department of Pathology, University of Utah Salt Lake City, UT, United States
| | - David Casero
- F Widjaja Foundation Inflammatory Bowel and Immunobiology Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, United States
| | - Dinesh S. Rao
- Department of Pathology & Laboratory Medicine, David Geffen School of Medicine, University of California Los Angeles, CA, United States
- Jonsson Comprehensive Cancer Center, University of California Los Angeles, CA, United States
- Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California Los Angeles, CA, United States
- *Correspondence: Dinesh S. Rao,
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King JK, Ung NM, Paing MH, Contreras JR, Alberti MO, Fernando TR, Zhang K, Pellegrini M, Rao DS. Regulation of Marginal Zone B-Cell Differentiation by MicroRNA-146a. Front Immunol 2017; 7:670. [PMID: 28138326 PMCID: PMC5237642 DOI: 10.3389/fimmu.2016.00670] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 12/19/2016] [Indexed: 11/13/2022] Open
Abstract
B-cell development in the bone marrow is followed by specification into functional subsets in the spleen, including marginal zone (MZ) B-cells. MZ B-cells are classically characterized by T-independent antigenic responses and require the elaboration of distinct gene expression programs for development. Given their role in gene regulation, it is not surprising that microRNAs are important factors in B-cell development. Recent work demonstrated that deficiency of the NFκB feedback regulator, miR-146a, led to a range of hematopoietic phenotypes, but B-cell phenotypes have not been extensively characterized. Here, we found that miR-146a-deficient mice demonstrate a reduction in MZ B-cells, likely from a developmental block. Utilizing high-throughput sequencing and comparative analysis of developmental stage-specific transcriptomes, we determined that MZ cell differentiation was impaired due to decreases in Notch2 signaling. Our studies reveal miR-146a-dependent B-cell phenotypes and highlight the complex role of miR-146a in the hematopoietic system.
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Affiliation(s)
- Jennifer K King
- Division of Rheumatology and STAR Program, Department of Medicine, University of California Los Angeles, Los Angeles, CA, USA; Cellular and Molecular Pathology Ph.D.Program, Department of Pathology and Laboratory Medicine, University of California, Los Angeles, CA, USA
| | - Nolan M Ung
- Department of Pathology and Laboratory Medicine, University of California Los Angeles , Los Angeles, CA , USA
| | - May H Paing
- Department of Pathology and Laboratory Medicine, University of California Los Angeles , Los Angeles, CA , USA
| | - Jorge R Contreras
- Cellular and Molecular Pathology Ph.D.Program, Department of Pathology and Laboratory Medicine, University of California, Los Angeles, CA, USA; Department of Pathology and Laboratory Medicine, University of California Los Angeles, Los Angeles, CA, USA
| | - Michael O Alberti
- Department of Pathology and Laboratory Medicine, University of California Los Angeles , Los Angeles, CA , USA
| | - Thilini R Fernando
- Department of Pathology and Laboratory Medicine, University of California Los Angeles , Los Angeles, CA , USA
| | - Kelvin Zhang
- Department of Biological Chemistry, University of California Los Angeles, Los Angeles, CA, USA; Howard Hughes Medical Institute, University of California Los Angeles, Los Angeles, CA, USA
| | - Matteo Pellegrini
- Jonsson Comprehensive Cancer Center, University of California Los Angeles, Los Angeles, CA, USA; Molecular Cell and Developmental Biology, University of California Los Angeles, Los Angeles, CA, USA; Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California Los Angeles, Los Angeles, CA, USA
| | - Dinesh S Rao
- Department of Pathology and Laboratory Medicine, University of California Los Angeles, Los Angeles, CA, USA; Jonsson Comprehensive Cancer Center, University of California Los Angeles, Los Angeles, CA, USA; Eli and Edythe Broad Center of Regenerative Medicine and Stem Cell Research, University of California Los Angeles, Los Angeles, CA, USA
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