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Wang P, Yang X, Zhang L, Sha S, Huang J, Peng J, Gu J, Pearson JA, Hu Y, Zhao H, Wong FS, Wang Q, Wen L. Tlr9 deficiency in B cells leads to obesity by promoting inflammation and gut dysbiosis. Nat Commun 2024; 15:4232. [PMID: 38762479 PMCID: PMC11102548 DOI: 10.1038/s41467-024-48611-8] [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: 08/02/2023] [Accepted: 05/02/2024] [Indexed: 05/20/2024] Open
Abstract
Toll-like receptor 9 (TLR9) recognizes bacterial, viral and self DNA and play an important role in immunity and inflammation. However, the role of TLR9 in obesity is less well-studied. Here, we generate B-cell-specific Tlr9-deficient (Tlr9fl/fl/Cd19Cre+/-, KO) B6 mice and model obesity using a high-fat diet. Compared with control mice, B-cell-specific-Tlr9-deficient mice exhibited increased fat tissue inflammation, weight gain, and impaired glucose and insulin tolerance. Furthermore, the frequencies of IL-10-producing-B cells and marginal zone B cells were reduced, and those of follicular and germinal center B cells were increased. This was associated with increased frequencies of IFNγ-producing-T cells and increased follicular helper cells. In addition, gut microbiota from the KO mice induced a pro-inflammatory state leading to immunological and metabolic dysregulation when transferred to germ-free mice. Using 16 S rRNA gene sequencing, we identify altered gut microbial communities including reduced Lachnospiraceae, which may play a role in altered metabolism in KO mice. We identify an important network involving Tlr9, Irf4 and Il-10 interconnecting metabolic homeostasis, with the function of B and T cells, and gut microbiota in obesity.
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Affiliation(s)
- Pai Wang
- Department of Gastrocolorectal Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
- Section of Endocrinology, Department of Internal Medicine, School of Medicine, Yale University, New Haven, CT, USA
| | - Xin Yang
- Section of Endocrinology, Department of Internal Medicine, School of Medicine, Yale University, New Haven, CT, USA
- Department of Food Science and Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Luyao Zhang
- Department of Gastrocolorectal Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
- Section of Endocrinology, Department of Internal Medicine, School of Medicine, Yale University, New Haven, CT, USA
| | - Sha Sha
- Section of Endocrinology, Department of Internal Medicine, School of Medicine, Yale University, New Haven, CT, USA
- Department of Nephrology, The First Affiliated Hospital of Shandong First Medical University, Jinan, Shandong, China
| | - Juan Huang
- Section of Endocrinology, Department of Internal Medicine, School of Medicine, Yale University, New Haven, CT, USA
| | - Jian Peng
- Section of Endocrinology, Department of Internal Medicine, School of Medicine, Yale University, New Haven, CT, USA
| | - Jianlei Gu
- Department of Biostatistics, Yale School of Public Health, New Haven, CT, USA
| | - James Alexander Pearson
- Section of Endocrinology, Department of Internal Medicine, School of Medicine, Yale University, New Haven, CT, USA
- Division of Infection and Immunity, School of Medicine and Systems Immunity University Research Institute, Cardiff University, Cardiff, UK
| | - Youjia Hu
- Section of Endocrinology, Department of Internal Medicine, School of Medicine, Yale University, New Haven, CT, USA
| | - Hongyu Zhao
- Department of Biostatistics, Yale School of Public Health, New Haven, CT, USA
| | - F Susan Wong
- Division of Infection and Immunity, School of Medicine and Systems Immunity University Research Institute, Cardiff University, Cardiff, UK
| | - Quan Wang
- Department of Gastrocolorectal Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China.
| | - Li Wen
- Section of Endocrinology, Department of Internal Medicine, School of Medicine, Yale University, New Haven, CT, USA.
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Langyue H, Ying Z, Jianfeng J, Yue Z, Huici Y, Hongyan L. IRF4-mediated Treg phenotype switching can aggravate hyperoxia-induced alveolar epithelial cell injury. BMC Pulm Med 2024; 24:130. [PMID: 38491484 PMCID: PMC10941512 DOI: 10.1186/s12890-024-02940-y] [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: 11/11/2023] [Accepted: 03/01/2024] [Indexed: 03/18/2024] Open
Abstract
Bronchopulmonary dysplasia (BPD) is characterized by alveolar dysplasia, and evidence indicates that interferon regulatory factor 4 (IRF4) is involved in the pathogenesis of various inflammatory lung diseases. Nonetheless, the significance and mechanism of IRF4 in BPD remain unelucidated. Consequently, we established a mouse model of BPD through hyperoxia exposure, and ELISA was employed to measure interleukin-17 A (IL-17 A) and interleukin-6 (IL-6) expression levels in lung tissues. Western blotting was adopted to determine the expression of IRF4, surfactant protein C (SP-C), and podoplanin (T1α) in lung tissues. Flow cytometry was utilized for analyzing the percentages of FOXP3+ regulatory T cells (Tregs) and FOXP3+RORγt+ Tregs in CD4+ T cells in lung tissues to clarify the underlying mechanism. Our findings revealed that BPD mice exhibited disordered lung tissue structure, elevated IRF4 expression, decreased SP-C and T1α expression, increased IL-17 A and IL-6 levels, reduced proportion of FOXP3+ Tregs, and increased proportion of FOXP3+RORγt+ Tregs. For the purpose of further elucidating the effect of IRF4 on Treg phenotype switching induced by hyperoxia in lung tissues, we exposed neonatal mice with IRF4 knockout to hyperoxia. These mice exhibited regular lung tissue structure, increased proportion of FOXP3+ Tregs, reduced proportion of FOXP3+RORγt+ Tregs, elevated SP-C and T1α expression, and decreased IL-17 A and IL-6 levels. In conclusion, our findings demonstrate that IRF4-mediated Treg phenotype switching in lung tissues exacerbates alveolar epithelial cell injury under hyperoxia exposure.
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Affiliation(s)
- He Langyue
- Department of Pediatrics, Affiliated Hospital of Jiangsu University, Zhenjiang, 212000, Jiangsu, China
| | - Zhu Ying
- Department of Pediatrics, Affiliated Hospital of Jiangsu University, Zhenjiang, 212000, Jiangsu, China
| | - Jiang Jianfeng
- Department of Pediatrics, Affiliated Hospital of Jiangsu University, Zhenjiang, 212000, Jiangsu, China
| | - Zhu Yue
- Department of Pediatrics, Affiliated Hospital of Jiangsu University, Zhenjiang, 212000, Jiangsu, China
| | - Yao Huici
- Department of Pediatrics, Affiliated Hospital of Jiangsu University, Zhenjiang, 212000, Jiangsu, China
| | - Lu Hongyan
- Department of Pediatrics, Affiliated Hospital of Jiangsu University, Zhenjiang, 212000, Jiangsu, China.
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Ottens K, Schneider J, Satterthwaite AB. B-1a Cells, but Not Marginal Zone B Cells, Are Implicated in the Accumulation of Autoreactive Plasma Cells in Lyn-/- Mice. Immunohorizons 2024; 8:47-56. [PMID: 38189742 PMCID: PMC10835670 DOI: 10.4049/immunohorizons.2300089] [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: 10/10/2023] [Accepted: 12/22/2023] [Indexed: 01/09/2024] Open
Abstract
Mice deficient in Lyn, a tyrosine kinase that limits B cell activation, develop a lupus-like autoimmune disease characterized by the accumulation of splenic plasma cells and the production of autoantibodies. Lyn-/- mice have reduced numbers of marginal zone (MZ) B cells, a B cell subset that is enriched in autoreactivity and prone to plasma cell differentiation. We hypothesized that this is due to unchecked terminal differentiation of this potentially pathogenic B cell subpopulation. However, impairing MZ B cell development in Lyn-/- mice did not reduce plasma cell accumulation or autoantibodies, and preventing plasma cell differentiation did not restore MZ B cell numbers. Instead, Lyn-/- mice accumulated B-1a cells when plasma cell differentiation was impaired. Similar to MZ B cells, B-1a cells tend to be polyreactive or weakly autoreactive and are primed for terminal differentiation. Our results implicate B-1a cells, but not MZ B cells, as contributors to the autoreactive plasma cell pool in Lyn-/- mice.
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Affiliation(s)
- Kristina Ottens
- Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX
| | - Jalyn Schneider
- Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX
| | - Anne B. Satterthwaite
- Department of Internal Medicine, UT Southwestern Medical Center, Dallas, TX
- Department of Immunology, UT Southwestern Medical Center, Dallas, TX
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Li F, Chen D, Zeng Q, Du Y. Possible Mechanisms of Lymphopenia in Severe Tuberculosis. Microorganisms 2023; 11:2640. [PMID: 38004652 PMCID: PMC10672989 DOI: 10.3390/microorganisms11112640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 10/20/2023] [Accepted: 10/24/2023] [Indexed: 11/26/2023] Open
Abstract
Tuberculosis (TB) is a chronic infectious disease caused by Mycobacterium tuberculosis (M. tuberculosis). In lymphopenia, T cells are typically characterized by progressive loss and a decrease in their count results. Lymphopenia can hinder immune responses and lead to systemic immunosuppression, which is strongly associated with mortality. Lymphopenia is a significant immunological abnormality in the majority of patients with severe and advanced TB, and its severity is linked to disease outcomes. However, the underlying mechanism remains unclear. Currently, the research on the pathogenesis of lymphopenia during M. tuberculosis infection mainly focuses on how it affects lymphocyte production, survival, or tissue redistribution. This includes impairing hematopoiesis, inhibiting T-cell proliferation, and inducing lymphocyte apoptosis. In this study, we have compiled the latest research on the possible mechanisms that may cause lymphopenia during M. tuberculosis infection. Lymphopenia may have serious consequences in severe TB patients. Additionally, we discuss in detail potential intervention strategies to prevent lymphopenia, which could help understand TB immunopathogenesis and achieve the goal of preventing and treating severe TB.
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Affiliation(s)
- Fei Li
- Institute of Pathogen Biology, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China; (D.C.); (Q.Z.); (Y.D.)
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Wittner J, Schuh W. Krüppel-like factor 2: a central regulator of B cell differentiation and plasma cell homing. Front Immunol 2023; 14:1172641. [PMID: 37251374 PMCID: PMC10213221 DOI: 10.3389/fimmu.2023.1172641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 04/06/2023] [Indexed: 05/31/2023] Open
Abstract
The development of B cells, their activation and terminal differentiation into antibody-producing plasma cells are characterized by alternating phases of proliferation and quiescence that are controlled by complex transcriptional networks. The spatial and anatomical organization of B cells and plasma cells inside lymphoid organs as well as their migration within lymphoid structures and between organs are prerequisites for the generation and the maintenance of humoral immune responses. Transcription factors of the Krüppel-like family are critical regulators of immune cell differentiation, activation, and migration. Here, we discuss the functional relevance of Krüppel-like factor 2 (KLF2) for B cell development, B cell activation, plasma cell formation and maintenance. We elaborate on KLF2-mediated regulation of B cell and plasmablast migration in the context of immune responses. Moreover, we describe the importance of KLF2 for the onset and the progression of B cell-related diseases and malignancies.
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Pilcher W, Thomas BE, Bhasin SS, Jayasinghe RG, Yao L, Gonzalez-Kozlova E, Dasari S, Kim-Schulze S, Rahman A, Patton J, Fiala M, Cheloni G, Kourelis T, Dhodapkar MV, Vij R, Mehr S, Hamilton M, Cho HJ, Auclair D, Avigan DE, Kumar SK, Gnjatic S, Ding L, Bhasin M. Cross center single-cell RNA sequencing study of the immune microenvironment in rapid progressing multiple myeloma. NPJ Genom Med 2023; 8:3. [PMID: 36702834 PMCID: PMC9879959 DOI: 10.1038/s41525-022-00340-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Accepted: 11/18/2022] [Indexed: 01/27/2023] Open
Abstract
Despite advancements in understanding the pathophysiology of Multiple Myeloma (MM), the cause of rapid progressing disease in a subset of patients is still unclear. MM's progression is facilitated by complex interactions with the surrounding bone marrow (BM) cells, forming a microenvironment that supports tumor growth and drug resistance. Understanding the immune microenvironment is key to identifying factors that promote rapid progression of MM. To accomplish this, we performed a multi-center single-cell RNA sequencing (scRNA-seq) study on 102,207 cells from 48 CD138- BM samples collected at the time of disease diagnosis from 18 patients with either rapid progressing (progression-free survival (PFS) < 18 months) or non-progressing (PFS > 4 years) disease. Comparative analysis of data from three centers demonstrated similar transcriptome profiles and cell type distributions, indicating subtle technical variation in scRNA-seq, opening avenues for an expanded multicenter trial. Rapid progressors depicted significantly higher enrichment of GZMK+ and TIGIT+ exhausted CD8+ T-cells (P = 0.022) along with decreased expression of cytolytic markers (PRF1, GZMB, GNLY). We also observed a significantly higher enrichment of M2 tolerogenic macrophages in rapid progressors and activation of pro-proliferative signaling pathways, such as BAFF, CCL, and IL16. On the other hand, non-progressive patients depicted higher enrichment for immature B Cells (i.e., Pre/Pro B cells), with elevated expression for markers of B cell development (IGLL1, SOX4, DNTT). This multi-center study identifies the enrichment of various pro-tumorigenic cell populations and pathways in those with rapid progressing disease and further validates the robustness of scRNA-seq data generated at different study centers.
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Affiliation(s)
- William Pilcher
- Aflac Cancer and Blood Disorders Center, Atlanta, GA, USA
- Coulter Department of Biomedical Engineering, Emory University, Atlanta, GA, USA
| | - Beena E Thomas
- Aflac Cancer and Blood Disorders Center, Atlanta, GA, USA
- Department of Pediatrics, Emory School of Medicine, Atlanta, GA, USA
| | - Swati S Bhasin
- Aflac Cancer and Blood Disorders Center, Atlanta, GA, USA
- Department of Pediatrics, Emory School of Medicine, Atlanta, GA, USA
| | - Reyka G Jayasinghe
- Department of Medicine, Washington University School of Medicine, Saint Louis, MO, USA
| | - Lijun Yao
- Department of Medicine, Washington University School of Medicine, Saint Louis, MO, USA
| | - Edgar Gonzalez-Kozlova
- Human Immune Monitoring Center, Icahn School of Medicine at Mt. Sinai, New York, NY, USA
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Surendra Dasari
- Division of Biomedical Statistics & Informatics, Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN, USA
| | - Seunghee Kim-Schulze
- Human Immune Monitoring Center, Icahn School of Medicine at Mt. Sinai, New York, NY, USA
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Adeeb Rahman
- Human Immune Monitoring Center, Icahn School of Medicine at Mt. Sinai, New York, NY, USA
- Department of Genetics and Genomic Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | | | - Mark Fiala
- Department of Medicine, Washington University School of Medicine, Saint Louis, MO, USA
| | - Giulia Cheloni
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | | | - Madhav V Dhodapkar
- Department of Hematology/Medical Oncology Emory University School of Medicine, Atlanta, GA, USA
- Winship Cancer Institute, Emory University, Atlanta, GA, USA
| | - Ravi Vij
- Washington University School of Medicine, St Louis, MO, USA
| | - Shaadi Mehr
- Multiple Myeloma Research Foundation (MMRF), Norwalk, CT, USA
| | - Mark Hamilton
- Multiple Myeloma Research Foundation (MMRF), Norwalk, CT, USA
| | - Hearn Jay Cho
- Human Immune Monitoring Center, Icahn School of Medicine at Mt. Sinai, New York, NY, USA
- Multiple Myeloma Research Foundation (MMRF), Norwalk, CT, USA
| | - Daniel Auclair
- Multiple Myeloma Research Foundation (MMRF), Norwalk, CT, USA
| | - David E Avigan
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Shaji K Kumar
- Mayo Clinic Rochester, Division of Hematology, Rochester, MN, USA
| | - Sacha Gnjatic
- Human Immune Monitoring Center, Icahn School of Medicine at Mt. Sinai, New York, NY, USA
- Department of Oncological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Li Ding
- Department of Medicine, Washington University School of Medicine, Saint Louis, MO, USA
| | - Manoj Bhasin
- Aflac Cancer and Blood Disorders Center, Atlanta, GA, USA.
- Coulter Department of Biomedical Engineering, Emory University, Atlanta, GA, USA.
- Department of Pediatrics, Emory School of Medicine, Atlanta, GA, USA.
- Winship Cancer Institute, Emory University, Atlanta, GA, USA.
- Department of Biomedical Informatics, Emory School of Medicine, Atlanta, GA, USA.
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Maffei R, Fiorcari S, Atene CG, Martinelli S, Mesini N, Pilato F, Lagreca I, Barozzi P, Riva G, Nasillo V, Paolini A, Forghieri F, Potenza L, Trenti T, Tagliafico E, Luppi M, Marasca R. The dynamic functions of IRF4 in B cell malignancies. Clin Exp Med 2022:10.1007/s10238-022-00968-0. [PMID: 36495369 PMCID: PMC10390622 DOI: 10.1007/s10238-022-00968-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 11/30/2022] [Indexed: 12/14/2022]
Abstract
AbstractThe trajectory of B cell development goes through subsequent steps governed by complex genetic programs, strictly regulated by multiple transcription factors. Interferon regulatory factor 4 (IRF4) regulates key points from pre-B cell development and receptor editing to germinal center formation, class-switch recombination and plasma cell differentiation. The pleiotropic ability of IRF4 is mediated by its “kinetic control”, allowing different IRF4 expression levels to activate distinct genetic programs due to modulation of IRF4 DNA-binding affinity. IRF4 is implicated in B cell malignancies, acting both as tumor suppressor and as tumor oncogene in different types of precursors and mature B cell neoplasia. Here, we summarize the complexity of IRF4 functions related to different DNA-binding affinity, multiple IRF4-specific target DNA motif, and interactions with transcriptional partners. Moreover, we describe the unique role of IRF4 in acute leukemias and B cell mature neoplasia, focusing on pathogenetic implications and possible therapeutic strategies in multiple myeloma and chronic lymphocytic leukemia.
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Yuan J, Liu Z, Wu Z, Yang J, Yang J. Construction and validation of an IRF4 risk score to predict prognosis and response to immunotherapy in hepatocellular carcinoma. Int Immunopharmacol 2022; 113:109411. [DOI: 10.1016/j.intimp.2022.109411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 09/29/2022] [Accepted: 10/29/2022] [Indexed: 11/09/2022]
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Pan J, Hu S, Ren X, Hu H, Deng X, Yu B, Cobos I, Chen X, Zhang W. Whole-Transcriptome Profiling and circRNA-miRNA-mRNA Regulatory Networks in B-Cell Development. Front Immunol 2022; 13:812924. [PMID: 35386709 PMCID: PMC8978327 DOI: 10.3389/fimmu.2022.812924] [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] [Received: 11/10/2021] [Accepted: 02/11/2022] [Indexed: 11/13/2022] Open
Abstract
The generation and differentiation of B lymphocytes (B cells) is a flexible process with many critical regulatory factors. Previous studies indicated that non-coding RNAs play multiple roles in the development of lymphocytes. However, little has been known about the circular RNA (circRNA) profiles and their competing endogenous RNA (ceRNA) networks in B-cell development and differentiation. Here, four B-cell subsets were purified from single-cell suspensions of mouse bone marrow. Then RNA sequencing (RNA-Seq) was used to display expression profiles of circRNAs, miRNAs and mRNAs during B-cell differentiation. 175, 203, 219 and 207 circRNAs were specifically expressed in pro-B cells, pre-B cells, immature B cells and mature B cells, respectively. The circRNA-associated ceRNA networks constructed in two sequential stages of B-cell differentiation revealed the potential mechanism of circRNAs in these processes. This study is the first to explore circRNA profiles and circRNA-miRNA-mRNA networks in different B-cell developmental stages of mouse bone marrow, which contribute to further research on their mechanism in B-cell development and differentiation.
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Affiliation(s)
- Jie Pan
- Biomedical Research Institute, Shenzhen Peking University - The Hong Kong University of Science and Technology Medical Center, Shenzhen, China.,Department of Pathology, Stanford University School of Medicine, Palo Alto, CA, United States
| | - Saineng Hu
- Biomedical Research Institute, Shenzhen Peking University - The Hong Kong University of Science and Technology Medical Center, Shenzhen, China
| | - Xuanyao Ren
- Biomedical Research Institute, Shenzhen Peking University - The Hong Kong University of Science and Technology Medical Center, Shenzhen, China
| | - Hao Hu
- Biomedical Research Institute, Shenzhen Peking University - The Hong Kong University of Science and Technology Medical Center, Shenzhen, China
| | - Xiaoying Deng
- Biomedical Research Institute, Shenzhen Peking University - The Hong Kong University of Science and Technology Medical Center, Shenzhen, China
| | - Bo Yu
- Department of Dermatology, Peking University Shenzhen Hospital, Shenzhen, China
| | - Inma Cobos
- Department of Pathology, Stanford University School of Medicine, Palo Alto, CA, United States
| | - Xiaofan Chen
- Biomedical Research Institute, Shenzhen Peking University - The Hong Kong University of Science and Technology Medical Center, Shenzhen, China
| | - Wei Zhang
- Biomedical Research Institute, Shenzhen Peking University - The Hong Kong University of Science and Technology Medical Center, Shenzhen, China.,Greater Bay Biomedical Innocenter, Shenzhen Bay Laboratory, Shenzhen, China
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