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Zhang Z, Xu J, Liu J, Wang J, Lei L. SEC: A core hub during cell fate alteration. FASEB J 2024; 38:e23680. [PMID: 38758186 DOI: 10.1096/fj.202400514r] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 04/18/2024] [Accepted: 05/07/2024] [Indexed: 05/18/2024]
Abstract
Pol II pause release is a rate-limiting step in gene transcription, influencing various cell fate alterations. Numerous proteins orchestrate Pol II pause release, thereby playing pivotal roles in the intricate process of cellular fate modulation. Super elongation complex (SEC), a large assembly comprising diverse protein components, has garnered attention due to its emerging significance in orchestrating physiological and pathological cellular identity changes by regulating the transcription of crucial genes. Consequently, SEC emerges as a noteworthy functional complex capable of modulating cell fate alterations. Therefore, a comprehensive review is warranted to systematically summarize the core roles of SEC in different types of cell fate alterations. This review focuses on elucidating the current understanding of the structural and functional basis of SEC. Additionally, we discuss the intricate regulatory mechanisms governing SEC in various models of cell fate alteration, encompassing both physiological and pathological contexts. Furthermore, leveraging the existing knowledge of SEC, we propose some insightful directions for future research, aiming to enhance our mechanistic and functional comprehension of SEC within the diverse landscape of cell fate alterations.
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Affiliation(s)
- Zhijing Zhang
- College of Life Science, Northeast Agricultural University, Harbin, Heilongjiang Province, China
- Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Jingyi Xu
- Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Jiqiang Liu
- Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China
| | - Jiaqiang Wang
- College of Life Science, Northeast Agricultural University, Harbin, Heilongjiang Province, China
| | - Lei Lei
- Department of Histology and Embryology, Harbin Medical University, Harbin, Heilongjiang Province, China
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Qi J, Yan L, Sun J, Huang C, Su B, Cheng J, Shen L. SUMO-specific protease 1 regulates germinal center B cell response through deSUMOylation of PAX5. Proc Natl Acad Sci U S A 2024; 121:e2314619121. [PMID: 38776375 PMCID: PMC11145296 DOI: 10.1073/pnas.2314619121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 04/30/2024] [Indexed: 05/25/2024] Open
Abstract
Humoral immunity depends on the germinal center (GC) reaction where B cells are tightly controlled for class-switch recombination and somatic hypermutation and finally generated into plasma and memory B cells. However, how protein SUMOylation regulates the process of the GC reaction remains largely unknown. Here, we show that the expression of SUMO-specific protease 1 (SENP1) is up-regulated in GC B cells. Selective ablation of SENP1 in GC B cells results in impaired GC dark and light zone organization and reduced IgG1-switched GC B cells, leading to diminished production of class-switched antibodies with high-affinity in response to a TD antigen challenge. Mechanistically, SENP1 directly binds to Paired box protein 5 (PAX5) to mediate PAX5 deSUMOylation, sustaining PAX5 protein stability to promote the transcription of activation-induced cytidine deaminase. In summary, our study uncovers SUMOylation as an important posttranslational mechanism regulating GC B cell response.
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Affiliation(s)
- Jingjing Qi
- Center for Immune-Related Diseases at Shanghai Institute of Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai200025, China
- Department of Immunology and Microbiology, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai200025, China
| | - Lichong Yan
- Center for Immune-Related Diseases at Shanghai Institute of Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai200025, China
| | - Jiping Sun
- Center for Immune-Related Diseases at Shanghai Institute of Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai200025, China
- Department of Immunology and Microbiology, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai200025, China
| | - Chuanxin Huang
- Department of Immunology and Microbiology, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai200025, China
| | - Bing Su
- Center for Immune-Related Diseases at Shanghai Institute of Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai200025, China
- Department of Immunology and Microbiology, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai200025, China
| | - Jinke Cheng
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai200025, China
| | - Lei Shen
- Center for Immune-Related Diseases at Shanghai Institute of Immunology, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai200025, China
- Department of Immunology and Microbiology, Key Laboratory of Cell Differentiation and Apoptosis of Chinese Ministry of Education, Shanghai Jiao Tong University School of Medicine, Shanghai200025, China
- Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory of Tumor Microenvironment and Inflammation, Shanghai Jiao Tong University School of Medicine, Shanghai200025, China
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McNitt DH, Joosse BA, Thomas JW, Bonami RH. Productive Germinal Center Responses Depend on the Nature of Stimuli Received by Anti-Insulin B Cells in Type 1 Diabetes-Prone Mice. Immunohorizons 2023; 7:384-397. [PMID: 37261716 PMCID: PMC10448785 DOI: 10.4049/immunohorizons.2300036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Accepted: 05/09/2023] [Indexed: 06/02/2023] Open
Abstract
Islet autoantibodies, including those directed at insulin, predict type 1 diabetes (T1D) in mice and humans and signal immune tolerance breach by B lymphocytes. High-affinity insulin autoantibodies and T follicular helper cell involvement implicate germinal centers (GCs) in T1D. The VH125SD BCR transgenic model, in which 1-2% of peripheral B lymphocytes recognize insulin, enables direct study of insulin-binding B cells. Our prior studies showed that anti-insulin B cell receptor transgene site-directed to H chain locus mice fail to generate insulin Ab following T-dependent immunization, but it was unclear whether anti-insulin B cells were blocked for GC initiation, survival, or differentiation into Ab-secreting cells. Here, we show that insulin-binding B cells in T1D-prone anti-insulin B cell receptor transgene site-directed to H chain locus mice can spontaneously adopt a GC phenotype and undergo class switching to the IgG1 isotype, with little if any switching to IgG2b. T-dependent immunizations with insulin SRBC or insulin CFA drove anti-insulin B lymphocytes to adopt a GC phenotype, despite blunted insulin Ab production. Dual immunization against self (insulin) and foreign (4-hydroxy-3-nitrophenylacetyl hapten conjugated to keyhole limpet hemocyanin) Ags showed an anti-insulin (but not anti-4-hydroxy-3-nitrophenylacetyl) Ab block that tracked with increased expression of the apoptosis marker, activated caspase 3, in self-reactive GC B cells. Finally, T-independent immunization with insulin conjugated to Brucella abortus ring test Ag released immune tolerance to allow robust expansion of anti-insulin GC B cells and IgG-switched insulin Ab production. Overall, these data pinpoint GC survival and Ab-secreting cell differentiation as immune tolerance blocks that limit T-dependent, but not T-independent, stimulation of anti-insulin B cell responses.
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Affiliation(s)
- Dudley H. McNitt
- Division of Rheumatology and Immunology, Department of
Medicine, Vanderbilt University Medical Center, Nashville, TN
| | - Bryan A. Joosse
- Division of Rheumatology and Immunology, Department of
Medicine, Vanderbilt University Medical Center, Nashville, TN
| | - James W. Thomas
- Division of Rheumatology and Immunology, Department of
Medicine, Vanderbilt University Medical Center, Nashville, TN
- Department of Pathology, Microbiology and
Immunology, Vanderbilt University Medical Center, Nashville, TN
| | - Rachel H. Bonami
- Division of Rheumatology and Immunology, Department of
Medicine, Vanderbilt University Medical Center, Nashville, TN
- Department of Pathology, Microbiology and
Immunology, Vanderbilt University Medical Center, Nashville, TN
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Chernova I, Song W, Steach H, Hafez O, Al Souz J, Chen PM, Chandra N, Cantley L, Veselits M, Clark MR, Craft J. The ion transporter Na +-K +-ATPase enables pathological B cell survival in the kidney microenvironment of lupus nephritis. SCIENCE ADVANCES 2023; 9:eadf8156. [PMID: 36724234 PMCID: PMC9891690 DOI: 10.1126/sciadv.adf8156] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The kidney is a comparatively hostile microenvironment characterized by highsodium concentrations; however, lymphocytes infiltrate and survive therein in autoimmune diseases such as lupus. The effects of sodium-lymphocyte interactions on tissue injury in autoimmune diseases and the mechanisms used by infiltrating lymphocytes to survive the highsodium environment of the kidney are not known. Here, we show that kidney-infiltrating B cells in lupus adapt to elevated sodium concentrations and that expression of sodium potassium adenosine triphosphatase (Na+-K+-ATPase) correlates with the ability of infiltrating cells to survive. Pharmacological inhibition of Na+-K+-ATPase and genetic knockout of Na+-K+-ATPase γ subunit resulted in reduced B cell infiltration into kidneys and amelioration of proteinuria. B cells in human lupus nephritis biopsies also had high expression of Na+-K+-ATPase. Our study reveals that kidney-infiltrating B cells in lupus initiate a tissue adaption program in response to sodium stress and identifies Na+-K+-ATPase as an organ-specific therapeutic target.
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Affiliation(s)
- Irene Chernova
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA
- Corresponding author. (I.C.); (J.C.)
| | - Wenzhi Song
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Holly Steach
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Omeed Hafez
- Department of Pathology, Yale University School of Medicine, New Haven, CT, USA
| | - Jafar Al Souz
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Ping-Min Chen
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Nisha Chandra
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA
| | - Lloyd Cantley
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA
| | - Margaret Veselits
- Section of Rheumatology and Gwen Knapp Center for Lupus and Immunology Research, Departments of Medicine and Pathology, University of Chicago, Chicago, IL, USA
| | - Marcus R. Clark
- Section of Rheumatology and Gwen Knapp Center for Lupus and Immunology Research, Departments of Medicine and Pathology, University of Chicago, Chicago, IL, USA
| | - Joe Craft
- Department of Internal Medicine, Yale University School of Medicine, New Haven, CT, USA
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
- Corresponding author. (I.C.); (J.C.)
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Ageing-Associated Transcriptomic Alterations in Peri-Implantitis Pathology: A Bioinformatic Study. DISEASE MARKERS 2022; 2022:8456968. [PMID: 36267464 PMCID: PMC9578877 DOI: 10.1155/2022/8456968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 09/13/2022] [Indexed: 11/17/2022]
Abstract
Background Ageing is associated with increased incidence of peri-implantitis but the roles of ageing-associated biological mechanisms in the occurrence of peri-implantitis are not known. This study is aimed at performing integrative bioinformatic analysis of publically available datasets to uncover molecular mechanisms related to ageing and peri-implantitis. Methods Gene expression datasets related to ageing and peri-implantitis (PI) were sought, and differentially expressed genes (DEGs) were analysed. Ageing-related genes were also identified from the “Aging Atlas” database. Using intersection analysis, an age-related-PI gene set was identified. Functional enrichment analysis for enriched GO biological process and KEGG pathways, protein-protein interaction (PPI) network analysis, correlation analysis, and immune cell infiltration analysis to determine high-abundance immune cells were performed. Least absolute shrinkage and selection operator (LASSO) logistic regression identified key age-related-PI genes. Transcription factor-gene and drug-gene interactions and enriched KEGG pathways for the key age-related-PI genes were determined. Results A total of 52 genes were identified as age-related-PI genes and found enriched in several inflammation-associated processes including myeloid leukocyte activation, acute inflammatory response, mononuclear cell differentiation, B cell activation, NF-kappa B signalling, IL-17 signalling, and TNF signalling. LYN, CDKN2A, MAPT, BTK, and PRKCB were hub genes in the PPI network. Immune cell infiltration analysis showed activated dendritic cells, central memory CD4 T cells, immature dendritic cells, and plasmacytoid dendritic cells were highly abundant in PI and ageing. 7 key age-related PI genes including ALOX5AP, EAF2, FAM46C, GZMK, MAPT, RGS1, and SOSTDC1 were identified using LASSO with high predictive values and found to be enriched in multiple neurodegeneration-associated pathways, MAPK signalling, and Fc epsilon RI signalling. MAPT and ALOX5AP were associated with multiple drugs and transcription factors and interacted with other age-related genes to regulate multiple biological pathways. Conclusion A suite of bioinformatics analysis identified a 7-signature gene set highly relevant to cooccurrence of ageing and peri-implantitis and highlighted the role of neurodegeneration, autoimmune, and inflammation related pathways. MAPT and ALOX5AP were identified as key candidate target genes for clinical translation.
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Gammaherpesvirus-mediated repression reveals EWSR1 to be a negative regulator of B cell responses. Proc Natl Acad Sci U S A 2022; 119:e2123362119. [PMID: 35921433 PMCID: PMC9371696 DOI: 10.1073/pnas.2123362119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The germinal center (GC) plays a central role in the generation of antigen-specific B cells and antibodies. Tight regulation of the GC is essential due to the inherent risks of tumorigenesis and autoimmunity posed by inappropriate GC B cell processes. Gammaherpesviruses such as Epstein-Barr virus (EBV) and murine gammaherpesvirus 68 (MHV68) utilize numerous armaments to drive infected naïve B cells, independent of antigen, through GC reactions to expand the latently infected B cell population and establish a stable latency reservoir. We previously demonstrated that the MHV68 microRNA (miRNA) mghv-miR-M1-7-5p represses host EWSR1 (Ewing sarcoma breakpoint region 1) to promote B cell infection. EWSR1 is a transcription and splicing regulator that is recognized for its involvement as a fusion protein in Ewing sarcoma. A function for EWSR1 in B cell responses has not been previously reported. Here, we demonstrate that 1) B cell-specific deletion of EWSR1 had no effect on generation of mature B cell subsets or basal immunoglobulin levels in naïve mice, 2) repression or ablation of EWSR1 in B cells promoted expansion of MHV68 latently infected GC B cells, and 3) B cell-specific deletion of EWSR1 during a normal immune response to nonviral antigen resulted in significantly elevated numbers of antigen-specific GC B cells, plasma cells, and circulating antibodies. Notably, EWSR1 deficiency did not affect the proliferation or survival of GC B cells but instead resulted in the generation of increased numbers of precursor GC B cells. Cumulatively, these findings demonstrate that EWSR1 is a negative regulator of B cell responses.
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Neuron-derived neuropeptide Y fine-tunes the splenic immune responses. Neuron 2022; 110:1327-1339.e6. [PMID: 35139365 DOI: 10.1016/j.neuron.2022.01.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Revised: 10/14/2021] [Accepted: 01/10/2022] [Indexed: 12/12/2022]
Abstract
The nervous and immune systems are closely entwined to maintain the immune balance in health and disease. Here, we showed that LPS can activate suprarenal and celiac ganglia (SrG-CG) neurons and upregulate NPY expression in rats. Single-cell sequencing analysis revealed that knockdown of the NPY gene in SrG-CG altered the proliferation and activation of splenic lymphocytes. In a neuron and splenocyte coculture system and in vivo experiments, neuronal NPY in SrG-CG attenuated the splenic immune response. Notably, we demonstrated that neuronal NPF in Drosophila exerted a conservative immunomodulatory effect. Moreover, numerous SNPs in NPY and its receptors were significantly associated with human autoimmune diseases, which was further supported by the autoimmune disease patients and mouse model experiments. Together, we demonstrated that NPY is an ancient language for nervous-immune system crosstalk and might be utilized to alleviate inflammatory storms during infection and to modulate immune balance in autoimmune diseases.
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Yang M, Yi P, Jiang J, Zhao M, Wu H, Lu Q. Dysregulated translational factors and epigenetic regulations orchestrate in B cells contributing to autoimmune diseases. Int Rev Immunol 2021; 42:1-25. [PMID: 34445929 DOI: 10.1080/08830185.2021.1964498] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
B cells play a crucial role in antigen presentation, antibody production and pro-/anti-inflammatory cytokine secretion in adaptive immunity. Several translational factors including transcription factors and cytokines participate in the regulation of B cell development, with the cooperation of epigenetic regulations. Autoimmune diseases are generally characterized with autoreactive B cells and high-level pathogenic autoantibodies. The success of B cell depletion therapy in mouse model and clinical trials has proven the role of B cells in pathogenesis of autoimmune diseases. The failure of B cell tolerance in immune checkpoints results in accumulated autoreactive naïve B (BN) cells with aberrant B cell receptor signaling and dysregulated B cell response, contributing to self-antibody-mediated autoimmune reaction. Dysregulation of translational factors and epigenetic alterations in B cells has been demonstrated to correlate with aberrant B cell compartment in autoimmune diseases, such as systemic lupus erythematosus, rheumatoid arthritis, primary Sjögren's syndrome, multiple sclerosis, diabetes mellitus and pemphigus. This review is intended to summarize the interaction of translational factors and epigenetic regulations that are involved with development and differentiation of B cells, and the mechanism of dysregulation in the pathogenesis of autoimmune diseases.
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Affiliation(s)
- Ming Yang
- Department of Dermatology, Second Xiangya Hospital, Central South University, Hunan Key Laboratory of Medical Epigenomics, Changsha, Hunan, China
| | - Ping Yi
- Department of Dermatology, Second Xiangya Hospital, Central South University, Hunan Key Laboratory of Medical Epigenomics, Changsha, Hunan, China
| | - Jiao Jiang
- Department of Dermatology, Second Xiangya Hospital, Central South University, Hunan Key Laboratory of Medical Epigenomics, Changsha, Hunan, China
| | - Ming Zhao
- Department of Dermatology, Second Xiangya Hospital, Central South University, Hunan Key Laboratory of Medical Epigenomics, Changsha, Hunan, China
| | - Haijing Wu
- Department of Dermatology, Second Xiangya Hospital, Central South University, Hunan Key Laboratory of Medical Epigenomics, Changsha, Hunan, China
| | - Qianjin Lu
- Department of Dermatology, Second Xiangya Hospital, Central South University, Hunan Key Laboratory of Medical Epigenomics, Changsha, Hunan, China.,Department of Dermatology, Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu, China
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Brym P, Wasilewska-Sakowska K, Mogielnicka-Brzozowska M, Mańkowska A, Paukszto Ł, Pareek CS, Kordan W, Kondracki S, Fraser L. Gene promoter polymorphisms in boar spermatozoa differing in freezability. Theriogenology 2021; 166:112-123. [PMID: 33735665 DOI: 10.1016/j.theriogenology.2021.02.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2020] [Revised: 01/23/2021] [Accepted: 02/22/2021] [Indexed: 01/13/2023]
Abstract
Single nucleotide polymorphisms (SNPs) in the 5'-flanking regulatory regions of genes could affect their expression levels. This is a follow-up study aimed to identify polymorphic variants in the 5'-flanking regulatory regions of genes expressed in boar spermatozoa, and to predict the interactions of such variants with transcription factors (TFs) on the gene promoter activity, using bioinformatics. Five and six boars were classified as having good and poor semen freezability (GSF and PSF, respectively) according to post-thaw (PT) assessment of sperm motility and membrane integrity characteristics. The 5'-flanking region sequences of the 14 genes (FOS, NFATC3, EAF2, FGF-14, BAMBI, RAB33B, CKS2, LARS2, SLC25A16, ACADM, CPT2, CCT3, DTD2 and CCDC85A) were PCR amplified and analyzed by Sanger sequencing method. A total of 32 polymorphic variants were identified in the 5'-flanking regions of the genes, including 4 insertion/deletion (indel) polymorphisms, and 8 unknown (novel) SNPs. Multiple sequence alignment analysis revealed a 26-bp indel variant in the 5'-flanking region of the LARS2 gene, which showed greater protein expression in spermatozoa from boars of the PSF group. It was found that 17 polymorphic variants, observed in the differentially expressed (DE) genes, showed significant allele frequency differences between the GSF and PSF groups. Polymorphic variants in the 5'-flanking regulatory regions of the genes contributed to the decrease or increase in the binding affinity for different testis-specific TFs, such as SMAD1, NF-1, FOXMI, RXRA, STAT4 and C/EBPβ. This study provides more insights into the mechanisms responsible for variations in transcriptional activity in promoters of genes expressed in boar spermatozoa. The allelic variants are promising genetic markers for predicting the freezability of boar spermatozoa.
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Affiliation(s)
- Paweł Brym
- Department of Animal Genetics, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, 10-719, Olsztyn, Poland
| | | | - Marzena Mogielnicka-Brzozowska
- Department of Animal Biochemistry and Biotechnology, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, 10-719, Olsztyn, Poland
| | - Anna Mańkowska
- Department of Animal Biochemistry and Biotechnology, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, 10-719, Olsztyn, Poland
| | - Łukasz Paukszto
- Department of Plant Physiology, Genetics and Biotechnology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, 10-719, Olsztyn, Poland
| | - Chandra S Pareek
- Institute of Veterinary Medicine, Faculty of Biological and Veterinary Sciences, Nicolaus Copernicus University, 87-100, Toruń, Poland
| | - Władysław Kordan
- Department of Animal Biochemistry and Biotechnology, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, 10-719, Olsztyn, Poland
| | - Stanisław Kondracki
- Faculty of Agrobioengineering and Animal Husbandry, Siedlce University of Natural Sciences and Humanities, 08-110, Siedlce, Poland
| | - Leyland Fraser
- Department of Animal Biochemistry and Biotechnology, Faculty of Animal Bioengineering, University of Warmia and Mazury in Olsztyn, 10-719, Olsztyn, Poland.
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Han W, Shen GL. Systematic expression analysis of EAF family reveals the importance of EAF2 in melanoma. Int Immunopharmacol 2020; 88:106958. [PMID: 33182068 DOI: 10.1016/j.intimp.2020.106958] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 08/13/2020] [Accepted: 08/28/2020] [Indexed: 10/23/2022]
Abstract
BACKGROUND Skin cutaneous melanoma (SKCM) accounts for over 75% of skin cancer-related deaths each year. EAF2, as a member of EAF family, has been found in several cancers, however, the role of EAF2 in SKCM is rarely studied. METHODS In this study, we utilized multiple bioinformatics tools to systematically analyze the expression of EAF family and investigate the prognostic value of EAF2 in melanoma. RESULTS We found both transcriptional and proteomics expression expressions of EAF2 were elevated in SKCM. Survival analysis and ROC curves showed significant diagnostic and prognostic ability of EAF2. Importantly, EAF2 expression was closely associated with the immune-infiltrating levels of B cells, CD4+ T, CD8+ T, neutrophils, macrophages and dendritic cells. Co-expression analysis showed EAF2 has a strong positive correlation with CD19, implying they may be functional partners in the immune response of SKCM. CONCLUSIONS In summary, our study is the first to reveal that increased expression of EAF2 is significantly correlated with tumor progression and better prognosis in SKCM patients. The role of EAF2 in SKCM demonstrated that it might be a potential and promising biomarker for the diagnosis and prediction of prognosis in patients with SKCM.
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Affiliation(s)
- Wei Han
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Soochow University, Suzhou 215000, PR China; Department of Surgery, Soochow University, Suzhou 215000, PR China.
| | - Guo-Liang Shen
- Department of Burn and Plastic Surgery, The First Affiliated Hospital of Soochow University, Suzhou 215000, PR China; Department of Surgery, Soochow University, Suzhou 215000, PR China.
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Sugimoto-Ishige A, Harada M, Tanaka M, Terooatea T, Adachi Y, Takahashi Y, Tanaka T, Burrows PD, Hikida M, Takemori T. Bim establishes the B cell repertoire from early to late in the immune response. Int Immunol 2020; 33:79-90. [PMID: 32889526 DOI: 10.1093/intimm/dxaa060] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 09/03/2020] [Indexed: 12/27/2022] Open
Abstract
In T cell-dependent antibody responses, some of the activated B cells differentiate along extrafollicular pathways into low-affinity memory and plasma cells, whereas others are involved in subsequent GC formation in follicular pathways, in which somatic hypermutation and affinity maturation occur. The present study demonstrated that Bim, a proapoptotic BH3-only member of the Bcl-2 family, contributes to the establishment of the B cell repertoire from early to late stages of immune responses to T-cell dependent antigens. Extrafollicular plasma cells grew in the spleen during the early immune response, but their numbers rapidly declined with the appearance of GC-derived progeny in wild type mice. By contrast, conditional Bim deficiency in B cells resulted in expansion of extrafollicular IgG1 + antibody-forming cells (AFCs) and this expansion was sustained during the late response, which hampered the formation of GC-derived high-affinity plasma cells in the spleen. Approximately 10% of AFCs in mutant mice contained mutated VH genes, thus Bim deficiency appears not to impede the selection of high-affinity AFC precursor cells. These results suggest that Bim contributes to the replacement of low affinity antibody by high affinity antibody as the immune response progresses.
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Affiliation(s)
- Akiko Sugimoto-Ishige
- Deparment of Life Science, Graduate School of Engineering Science, Akita University, Tegatagauencho, Akita City, Akita, Japan.,Drug Discovery Antibody Platform Unit, RIKEN Research Center for Integrative Medical Sciences, Suehiro-cho, Tsurumi, Yokohama, Kanagawa, Japan.,Laboratory for Inflammatory Regulation, RIKEN Research Center for Integrative Medical Sciences, Suehiro-cho, Tsurumi, Yokohama, Kanagawa, Japan
| | - Michishige Harada
- Drug Discovery Antibody Platform Unit, RIKEN Research Center for Integrative Medical Sciences, Suehiro-cho, Tsurumi, Yokohama, Kanagawa, Japan
| | - Miho Tanaka
- Drug Discovery Antibody Platform Unit, RIKEN Research Center for Integrative Medical Sciences, Suehiro-cho, Tsurumi, Yokohama, Kanagawa, Japan
| | - Tommy Terooatea
- Laboratory for Cellular Epigenomics, RIKEN Research Center for Integrative Medical Sciences, Suehiro-cho, Tsurumi, Yokohama, Kanagawa, Japan
| | - Yu Adachi
- Department of Immunology, National Institute of Infectious Diseases, Toyama, Shinjuku-ku Tokyo, Japan
| | - Yoshimasa Takahashi
- Department of Immunology, National Institute of Infectious Diseases, Toyama, Shinjuku-ku Tokyo, Japan
| | - Takashi Tanaka
- Laboratory for Inflammatory Regulation, RIKEN Research Center for Integrative Medical Sciences, Suehiro-cho, Tsurumi, Yokohama, Kanagawa, Japan
| | - Peter D Burrows
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Masaki Hikida
- Deparment of Life Science, Graduate School of Engineering Science, Akita University, Tegatagauencho, Akita City, Akita, Japan
| | - Toshitada Takemori
- Drug Discovery Antibody Platform Unit, RIKEN Research Center for Integrative Medical Sciences, Suehiro-cho, Tsurumi, Yokohama, Kanagawa, Japan.,Laboratory for Inflammatory Regulation, RIKEN Research Center for Integrative Medical Sciences, Suehiro-cho, Tsurumi, Yokohama, Kanagawa, Japan
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12
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Hong R, Lai N, Xiong E, Ouchida R, Sun J, Zhou Y, Tang Y, Hikida M, Tsubata T, Tagawa M, Wang Y, Wang JY. Distinct roles of BCNP1 in B-cell development and activation. Int Immunol 2020; 32:17-26. [PMID: 31412363 DOI: 10.1093/intimm/dxz055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Accepted: 08/11/2019] [Indexed: 11/13/2022] Open
Abstract
B-cell novel protein 1 (BCNP1) has recently been identified as a new B-cell receptor (BCR) signaling molecule but its physiological function remains unknown. Here, we demonstrate that mice deficient in BCNP1 exhibit impaired B-cell maturation and a reduction of B-1a cells. BCNP1-deficient spleen B cells show enhanced survival, proliferation and Ca2+ influx in response to BCR cross-linking as compared with wild-type spleen B cells. Consistently, mutant B cells show elevated phosphorylation of SYK, B-cell linker protein (BLNK) and PLCγ2 upon BCR cross-linking. In vivo, BCNP1-deficient mice exhibit enhanced humoral immune responses to T-independent and T-dependent antigens. Moreover, aged mutant mice contain elevated levels of serum IgM and IgG3 antibodies and exhibit polyclonal and monoclonal B-cell expansion in lymphoid organs. These results reveal distinct roles for BCNP1 in B-cell development, activation and homeostasis.
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Affiliation(s)
- Rongjian Hong
- Department of Immunology, School of Basic Medical Sciences.,Department of Integrative Medicine and Neurobiology, School of Basic Medical Sciences, State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Collaborative Innovation Center for Brain Science, Fudan University, Shanghai 200032, China
| | - Nannan Lai
- Department of Immunology, School of Basic Medical Sciences
| | - Ermeng Xiong
- Department of Immunology, School of Basic Medical Sciences
| | - Rika Ouchida
- Division of Mucosal Immunology, The Institute of Medical Science, The University of Tokyo, Tokyo, Japan
| | - Jiping Sun
- Department of Immunology, School of Basic Medical Sciences
| | - Yang Zhou
- Department of Immunology, School of Basic Medical Sciences.,Department of Integrative Medicine and Neurobiology, School of Basic Medical Sciences, State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Collaborative Innovation Center for Brain Science, Fudan University, Shanghai 200032, China
| | - Yue Tang
- Department of Immunology, School of Basic Medical Sciences
| | - Masaki Hikida
- Faculty of Engineering Science, Graduate School of Engineering Science, Akita University, Akita, Japan
| | - Takeshi Tsubata
- Department of Immunology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | - Masatoshi Tagawa
- Division of Pathology and Cell Therapy, Chiba Cancer Center Research Institute, Chiba, Japan
| | - Yanqing Wang
- Department of Integrative Medicine and Neurobiology, School of Basic Medical Sciences, State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Collaborative Innovation Center for Brain Science, Fudan University, Shanghai 200032, China
| | - Ji-Yang Wang
- Department of Immunology, School of Basic Medical Sciences.,Department of Integrative Medicine and Neurobiology, School of Basic Medical Sciences, State Key Laboratory of Medical Neurobiology, Institutes of Brain Science, Collaborative Innovation Center for Brain Science, Fudan University, Shanghai 200032, China.,Department of Immunology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
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13
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Mitchell S. What Will B Will B: Identifying Molecular Determinants of Diverse B-Cell Fate Decisions Through Systems Biology. Front Cell Dev Biol 2020; 8:616592. [PMID: 33511125 PMCID: PMC7835399 DOI: 10.3389/fcell.2020.616592] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 12/02/2020] [Indexed: 12/25/2022] Open
Abstract
B-cells are the poster child for cellular diversity and heterogeneity. The diverse repertoire of B lymphocytes, each expressing unique antigen receptors, provides broad protection against pathogens. However, B-cell diversity goes beyond unique antigen receptors. Side-stepping B-cell receptor (BCR) diversity through BCR-independent stimuli or engineered organisms with monoclonal BCRs still results in seemingly identical B-cells reaching a wide variety of fates in response to the same challenge. Identifying to what extent the molecular state of a B-cell determines its fate is key to gaining a predictive understanding of B-cells and consequently the ability to control them with targeted therapies. Signals received by B-cells through transmembrane receptors converge on intracellular molecular signaling networks, which control whether each B-cell divides, dies, or differentiates into a number of antibody-secreting distinct B-cell subtypes. The signaling networks that interpret these signals are well known to be susceptible to molecular variability and noise, providing a potential source of diversity in cell fate decisions. Iterative mathematical modeling and experimental studies have provided quantitative insight into how B-cells achieve distinct fates in response to pathogenic stimuli. Here, we review how systems biology modeling of B-cells, and the molecular signaling networks controlling their fates, is revealing the key determinants of cell-to-cell variability in B-cell destiny.
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14
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Li S, Liu J, Min Q, Ikawa T, Yasuda S, Yang Y, Wang YQ, Tsubata T, Zhao Y, Wang JY. Kelch-like protein 14 promotes B-1a but suppresses B-1b cell development. Int Immunol 2019; 30:311-318. [PMID: 29939266 DOI: 10.1093/intimm/dxy033] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Accepted: 06/12/2018] [Indexed: 11/14/2022] Open
Abstract
B-1 cells are innate-like B-cell population and produce natural antibodies that contribute to the first line of host defense. There are two subsets of B-1 cells: B-1a and B-1b. B-1a cells are the main producer of poly-reactive and autoreactive natural IgM antibodies, whereas B-1b cells can respond specifically to T-cell-independent antigens. Despite the functional significance of B-1a and B-1b cells, little information is available about what regulates the development of these two subsets. We found that Kelch-like protein 14 (KLHL14) was expressed at high levels in B cells but only at low levels in a few non-lymphoid tissues. Although mice lacking KLHL14 died right after birth, the heterozygotes developed normally with no gross abnormalities by appearance. B-cell development in the bone marrow and maturation and activation in the spleen were not affected in the heterozygous mice. However, the number of peritoneal B-1a cells was significantly reduced while B-1b cells were increased in Klhl14 heterozygous mice compared with wild-type (WT) mice. Consistently, Rag1-/- mice reconstituted with Klhl14-/- fetal liver cells had a more severe reduction of B-1a and an increase of B-1b cells in the peritoneal cavity. KLHL14 did not affect the turnover or apoptosis of B-1a and B-1b cells in vivo. Moreover, Klhl14-/- fetal liver contained a similar proportion and absolute numbers of the B-1 progenitor cells as did WT fetal liver. These results suggest that KLHL14 promotes B-1a development in mice.
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Affiliation(s)
- Shuyin Li
- Department of Immunology, School of Basic Medical Sciences, Fudan University, Shanghai, China.,State Key Laboratory of AgroBiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China
| | - Jun Liu
- Department of Immunology, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Qing Min
- Department of Immunology, School of Basic Medical Sciences, Fudan University, Shanghai, China
| | - Tomokatsu Ikawa
- Laboratory for Immune Regeneration, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan
| | - Shoya Yasuda
- Department of Computational Intelligence and Systems Science, Tokyo Institute of Technology, Yokohama, Japan
| | - Yang Yang
- Department of Genetics, Stanford University School of Medicine, Stanford, CA, USA
| | - Yan-Qing Wang
- Department of Integrative Medicine and Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai, China.,Institute of Acupuncture and Moxibustion, Fudan Institutes of Integrative Medicine, Fudan University, Shanghai, China
| | - Takeshi Tsubata
- Department of Immunology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan
| | - Yaofeng Zhao
- State Key Laboratory of AgroBiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China
| | - Ji-Yang Wang
- Department of Immunology, School of Basic Medical Sciences, Fudan University, Shanghai, China.,Department of Integrative Medicine and Neurobiology, School of Basic Medical Sciences, Fudan University, Shanghai, China.,Institute of Acupuncture and Moxibustion, Fudan Institutes of Integrative Medicine, Fudan University, Shanghai, China
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15
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MZB1 promotes the secretion of J-chain-containing dimeric IgA and is critical for the suppression of gut inflammation. Proc Natl Acad Sci U S A 2019; 116:13480-13489. [PMID: 31127044 DOI: 10.1073/pnas.1904204116] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
IgA is the most abundantly produced antibody in the body and plays a crucial role in gut homeostasis and mucosal immunity. IgA forms a dimer that covalently associates with the joining (J) chain, which is essential for IgA transport into the mucosa. Here, we demonstrate that the marginal zone B and B-1 cell-specific protein (MZB1) interacts with IgA through the α-heavy-chain tailpiece dependent on the penultimate cysteine residue and prevents the intracellular degradation of α-light-chain complexes. Moreover, MZB1 promotes J-chain binding to IgA and the secretion of dimeric IgA. MZB1-deficient mice are impaired in secreting large amounts of IgA into the gut in response to acute inflammation and develop severe colitis. Oral administration of a monoclonal IgA significantly ameliorated the colitis, accompanied by normalization of the gut microbiota composition. The present study identifies a molecular chaperone that promotes J-chain binding to IgA and reveals an important mechanism that controls the quantity, quality, and function of IgA.
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16
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Zhong M, Pascal LE, Cheng E, Masoodi KZ, Chen W, Green A, Cross BW, Parrinello E, Rigatti LH, Wang Z. Concurrent EAF2 and ELL2 loss phenocopies individual EAF2 or ELL2 loss in prostate cancer cells and murine prostate. AMERICAN JOURNAL OF CLINICAL AND EXPERIMENTAL UROLOGY 2018; 6:234-244. [PMID: 30697579 PMCID: PMC6334201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Accepted: 11/12/2018] [Indexed: 06/09/2023]
Abstract
Elongation factor for RNA polymerase II 2 (ELL2) and ELL-associated factor 2 (EAF2) are two functionally related androgen responsive gene-encoded proteins with prostate tumor suppressor characteristics. EAF2 and ELL2 have both been shown to be down-regulated in advanced prostate cancer, and mice with either Eaf2 or Ell2 deficiency developed murine prostatic intraepithelial neoplasia (mPIN), increased cellular proliferation and increased vascularity. Functional studies have revealed that EAF2 and ELL2 can bind to each other and have similar roles in regulating cell proliferation, angiogenesis and prostate homeostasis. Here, cell line experiments showed that knockdown of EAF2 or ELL2 induced an increase in proliferation and migration in C4-2 and 22Rv1 prostate cancer cells. Concurrent knockdown of EAF2 and ELL2 increased proliferation and migration similarly to the loss of EAF2 or ELL2 alone. Mice with homozygous deletion of Ell2 or heterozygous deletion of Eaf2 developed mPIN lesions characterized by increased epithelial proliferation, intraductal microvessel density, and infiltrating intraductal CD3-positive T-cells compared to wild-type controls. Mice with combined heterozygous deletion of Eaf2 and Ell2 developed mPIN lesions that were similar to those observed in mice with deficiency in Eaf2 or Ell2 alone. These results suggest that EAF2 and ELL2 have similar functions and are likely to require each other in their regulation of prostate epithelial cell proliferation and migration in prostate cancer cells as well as their tumor suppressive properties in the murine prostate.
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Affiliation(s)
- Mingming Zhong
- Department of Urology, School of Medicine, University of PittsburghPittsburgh, PA, USA
| | - Laura E Pascal
- Department of Urology, School of Medicine, University of PittsburghPittsburgh, PA, USA
| | - Erdong Cheng
- Department of Urology, School of Medicine, University of PittsburghPittsburgh, PA, USA
| | - Khalid Z Masoodi
- Department of Urology, School of Medicine, University of PittsburghPittsburgh, PA, USA
- Transcriptomics Lab, Division of Plant BiotechnologySKUAST-K, Shalimar, Srinagar, J&K, India
| | - Wei Chen
- Department of Urology, School of Medicine, University of PittsburghPittsburgh, PA, USA
| | - Anthony Green
- Department of Pathology, Pitt Biospecimen Core, School of Medicine, University of PittsburghPittsburgh, PA, USA
| | - Brian W Cross
- Department of Urology, School of Medicine, University of PittsburghPittsburgh, PA, USA
| | - Erica Parrinello
- Department of Urology, School of Medicine, University of PittsburghPittsburgh, PA, USA
| | - Lora H Rigatti
- Division of Laboratory Animal Resources, School of Medicine, University of PittsburghPittsburgh, PA, USA
| | - Zhou Wang
- University of Pittsburgh Cancer Institute, School of Medicine, University of PittsburghPittsburgh, PA, USA
- Department of Urology, School of Medicine, University of PittsburghPittsburgh, PA, USA
- Department of Pharmacology and Chemical Biology, School of Medicine, University of PittsburghPittsburgh, PA, USA
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17
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Hjorton K, Hagberg N, Israelsson E, Jinton L, Berggren O, Sandling JK, Thörn K, Mo J, Eloranta ML, Rönnblom L. Cytokine production by activated plasmacytoid dendritic cells and natural killer cells is suppressed by an IRAK4 inhibitor. Arthritis Res Ther 2018; 20:238. [PMID: 30355354 PMCID: PMC6235225 DOI: 10.1186/s13075-018-1702-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 08/16/2018] [Indexed: 11/10/2022] Open
Abstract
Background In systemic lupus erythematosus (SLE), immune complexes (ICs) containing self-derived nucleic acids trigger the synthesis of proinflammatory cytokines by immune cells. We asked how an interleukin (IL)-1 receptor-associated kinase 4 small molecule inhibitor (IRAK4i) affects RNA-IC-induced cytokine production compared with hydroxychloroquine (HCQ). Methods Plasmacytoid dendritic cells (pDCs) and natural killer (NK) cells were isolated from peripheral blood mononuclear cells (PBMCs) of healthy individuals. PBMCs from SLE patients and healthy individuals were depleted of monocytes. Cells were stimulated with RNA-containing IC (RNA-IC) in the presence or absence of IRAK4i I92 or HCQ, and cytokines were measured by immunoassay or flow cytometry. Transcriptome sequencing was performed on RNA-IC-stimulated pDCs from healthy individuals to assess the effect of IRAK4i and HCQ. Results In healthy individuals, RNA-IC induced interferon (IFN)-α, tumor necrosis factor (TNF)-α, IL-6, IL-8, IFN-γ, macrophage inflammatory protein (MIP)1-α, and MIP1-β production in pDC and NK cell cocultures. IFN-α production was selective for pDCs, whereas both pDCs and NK cells produced TNF-α. IRAK4i reduced the pDC and NK cell-derived cytokine production by 74–95%. HCQ interfered with cytokine production in pDCs but not in NK cells. In monocyte-depleted PBMCs, IRAK4i blocked cytokine production more efficiently than HCQ. Following RNA-IC activation of pDCs, 975 differentially expressed genes were observed (false discovery rate (FDR) < 0.05), with many connected to cytokine pathways, cell regulation, and apoptosis. IRAK4i altered the expression of a larger number of RNA-IC-induced genes than did HCQ (492 versus 65 genes). Conclusions The IRAK4i I92 exhibits a broader inhibitory effect than HCQ on proinflammatory pathways triggered by RNA-IC, suggesting IRAK4 inhibition as a therapeutic option in SLE. Electronic supplementary material The online version of this article (10.1186/s13075-018-1702-0) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Karin Hjorton
- Department of Medical Sciences, Rheumatology, Science for Life Laboratory, Uppsala University, Rudbecklaboratoriet, Dag Hammarskjölds v 20, C11, 751 85, Uppsala, Sweden.
| | - Niklas Hagberg
- Department of Medical Sciences, Rheumatology, Science for Life Laboratory, Uppsala University, Rudbecklaboratoriet, Dag Hammarskjölds v 20, C11, 751 85, Uppsala, Sweden
| | - Elisabeth Israelsson
- Respiratory, Inflammation and Autoimmunity, IMED Biotech Unit, AstraZeneca, Gothenburg, Sweden
| | - Lisa Jinton
- Respiratory, Inflammation and Autoimmunity, IMED Biotech Unit, AstraZeneca, Gothenburg, Sweden
| | - Olof Berggren
- Department of Medical Sciences, Rheumatology, Science for Life Laboratory, Uppsala University, Rudbecklaboratoriet, Dag Hammarskjölds v 20, C11, 751 85, Uppsala, Sweden
| | - Johanna K Sandling
- Department of Medical Sciences, Rheumatology, Science for Life Laboratory, Uppsala University, Rudbecklaboratoriet, Dag Hammarskjölds v 20, C11, 751 85, Uppsala, Sweden
| | - Kristofer Thörn
- Respiratory, Inflammation and Autoimmunity, IMED Biotech Unit, AstraZeneca, Gothenburg, Sweden
| | - John Mo
- Respiratory, Inflammation and Autoimmunity, IMED Biotech Unit, AstraZeneca, Gothenburg, Sweden
| | | | - Maija-Leena Eloranta
- Department of Medical Sciences, Rheumatology, Science for Life Laboratory, Uppsala University, Rudbecklaboratoriet, Dag Hammarskjölds v 20, C11, 751 85, Uppsala, Sweden
| | - Lars Rönnblom
- Department of Medical Sciences, Rheumatology, Science for Life Laboratory, Uppsala University, Rudbecklaboratoriet, Dag Hammarskjölds v 20, C11, 751 85, Uppsala, Sweden
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18
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Weber TS. Cell Cycle-Associated CXCR4 Expression in Germinal Center B Cells and Its Implications on Affinity Maturation. Front Immunol 2018; 9:1313. [PMID: 29951060 PMCID: PMC6008520 DOI: 10.3389/fimmu.2018.01313] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Accepted: 05/28/2018] [Indexed: 11/13/2022] Open
Abstract
Adaptation of antibody-mediated immunity occurs in germinal centers (GC). It is where affinity maturation, class switching, memory and plasma cell differentiation synergize to generate specific high-affinity antibodies that aid both to clear and protect against reinfection of invading pathogens. Within GCs, light and dark zone are two compartments instrumental in regulating this process, by segregating T cell-dependent selection and differentiation from generation of GC B cells bearing hypermutated antigen receptors. Spatial segregation of GC B cells into the two zones relies on the chemokine receptor CXCR4, with textbooks attributing high and low expression to a dark and light zone phenotype. Interestingly, this bipolarity is not reflected in the CXCR4 expression profile of GC B cells, which is highly variable and unimodal, indicating a continuum of intermediate CXCR4 levels rather than a binary dark or light zone phenotype. Here, analysis of published BrdU pulse-chase data reveals that throughout cell cycle, average CXCR4 expression in GC B cells steadily increases close to twofold, scaling with cell surface area. CXCR4 expression in recently divided GC B cells in G0/G1 or early S phase shows intermediate levels compared to cells in G2M phase, consistent with their smaller size. The lowest number of CXCR4 receptors are displayed by relatively aged GC B cells in G0/G1 or early S phase. The latter, upon progressing through S phase, however, ramp up relative CXCR4 expression twice as much as recently divided cells. Twelve hours after the BrdU pulse, labeled GC B cells, while initially in S phase, are desynchronized in terms of cell cycle and match the CXCR4 profile of unlabeled cells. A model is discussed in which CXCR4 expression in GC B cell increases with cell cycle and cell surface area, with highest levels in G2 and M phase, coinciding with GC B cell receptor signaling in G2 and immediately preceding activation-induced cytidine deaminase (AID) activity in early G1. In the model, GC B cells compete for CXCL12 expression on the basis of their CXCR4 expression, gaining a relative advantage as they progress in cell cycle, but loosing the advantage at the moment they divide.
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Affiliation(s)
- Tom S Weber
- Molecular Medicine Division, Walter and Eliza Hall Institute for Medical Research, Parkville, VIC, Australia.,Department of Medical Biology, The University of Melbourne, Parkville, VIC, Australia
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19
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Alsughayyir J, Pettigrew GJ, Motallebzadeh R. Spoiling for a Fight: B Lymphocytes As Initiator and Effector Populations within Tertiary Lymphoid Organs in Autoimmunity and Transplantation. Front Immunol 2017; 8:1639. [PMID: 29218052 PMCID: PMC5703719 DOI: 10.3389/fimmu.2017.01639] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Accepted: 11/09/2017] [Indexed: 12/13/2022] Open
Abstract
Tertiary lymphoid organs (TLOs) develop at ectopic sites within chronically inflamed tissues, such as in autoimmunity and rejecting organ allografts. TLOs differ structurally from canonical secondary lymphoid organs (SLOs), in that they lack a mantle zone and are not encapsulated, suggesting that they may provide unique immune function. A notable feature of TLOs is the frequent presence of structures typical of germinal centers (GCs). However, little is known about the role of such GCs, and in particular, it is not clear if the B cell response within is autonomous, or whether it synergizes with concurrent responses in SLOs. This review will discuss ectopic lymphoneogenesis and the role of the B cell in TLO formation and subsequent effector output in the context of autoimmunity and transplantation, with particular focus on the contribution of ectopic GCs to affinity maturation in humoral immune responses and to the potential breakdown of self-tolerance and development of humoral autoimmunity.
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Affiliation(s)
- Jawaher Alsughayyir
- School of Clinical Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Gavin J Pettigrew
- School of Clinical Medicine, University of Cambridge, Cambridge, United Kingdom
| | - Reza Motallebzadeh
- Division of Surgery and Interventional Science, University College London, London, United Kingdom.,Institute of Immunity and Transplantation, University College London, London, United Kingdom.,Department of Nephrology, Urology and Transplantation, Royal Free Hospital, London, United Kingdom
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20
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Chen J, Cai Z, Zhang L, Yin Y, Chen X, Chen C, Zhang Y, Zhai S, Long X, Liu X, Wang X. Lis1 Regulates Germinal Center B Cell Antigen Acquisition and Affinity Maturation. THE JOURNAL OF IMMUNOLOGY 2017; 198:4304-4311. [PMID: 28446568 DOI: 10.4049/jimmunol.1700159] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 03/27/2017] [Indexed: 01/07/2023]
Abstract
The germinal center (GC) is the site where activated B cells undergo rapid expansions, somatic hypermutation, and affinity maturation. Affinity maturation is a process of Ag-driven selection. The amount of Ag acquired and displayed by GC B cells determines whether it can be positively selected, and therefore Ag acquisition has to be tightly regulated to ensure the efficient affinity maturation. Cell expansion provides sufficient quantity of GC B cells and Abs, whereas affinity maturation improves the quality of Abs. In this study, we found that Lis1 is a cell-intrinsic regulator of Ag acquisition capability of GC B cells. Lack of Lis1 resulted in redistribution of polymerized actin and accumulation of F-actin at uropod; larger amounts of Ags were acquired and displayed by GC B cells, which presumably reduced the selection stringency. Affinity maturation was thus compromised in Lis1-deficient mice. Consistently, overexpression of Lis1 in GC B cells led to less Ag acquisition and display. Additionally, Lis1 is required for GC B cell expansion, and Lis1 deficiency blocked the cell cycle at the mitotic phase and GC B cells were prone to apoptosis. Overall, we suggest that Lis1 is required for GC B cell expansion, affinity maturation, and maintaining functional intact GC response, thus ensuring both the quantity and quality of Ab response.
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Affiliation(s)
- Jingjing Chen
- Department of Immunology, State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China; and
| | - Zhenming Cai
- Department of Immunology, State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China; and
| | - Le Zhang
- Department of Immunology, State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China; and
| | - Yuye Yin
- Department of Immunology, State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China; and
| | - Xufeng Chen
- State Key Laboratory of Cell Biology, Chinese Academy of Sciences Center for Excellence in Molecular Cell Science, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Chao Chen
- Department of Immunology, State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China; and
| | - Yang Zhang
- Department of Immunology, State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China; and
| | - Sulan Zhai
- Department of Immunology, State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China; and
| | - Xuehui Long
- Department of Immunology, State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China; and
| | - Xiaolong Liu
- State Key Laboratory of Cell Biology, Chinese Academy of Sciences Center for Excellence in Molecular Cell Science, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Xiaoming Wang
- Department of Immunology, State Key Laboratory of Reproductive Medicine, Nanjing Medical University, Nanjing, Jiangsu 211166, China; and
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21
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Sharma N. Regulation of RNA polymerase II-mediated transcriptional elongation: Implications in human disease. IUBMB Life 2016; 68:709-16. [DOI: 10.1002/iub.1538] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Accepted: 07/14/2016] [Indexed: 01/03/2023]
Affiliation(s)
- Nimisha Sharma
- University School of Biotechnology, G.G.S. Indraprastha University; Dwarka New Delhi 110078 India
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