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Ahmad Z, Kahloan W, Rosen ED. Transcriptional control of metabolism by interferon regulatory factors. Nat Rev Endocrinol 2024; 20:573-587. [PMID: 38769435 PMCID: PMC11392651 DOI: 10.1038/s41574-024-00990-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 04/12/2024] [Indexed: 05/22/2024]
Abstract
Interferon regulatory factors (IRFs) comprise a family of nine transcription factors in mammals. IRFs exert broad effects on almost all aspects of immunity but are best known for their role in the antiviral response. Over the past two decades, IRFs have been implicated in metabolic physiology and pathophysiology, partly as a result of their known functions in immune cells, but also because of direct actions in adipocytes, hepatocytes, myocytes and neurons. This Review focuses predominantly on IRF3 and IRF4, which have been the subject of the most intense investigation in this area. IRF3 is located in the cytosol and undergoes activation and nuclear translocation in response to various signals, including stimulation of Toll-like receptors, RIG-I-like receptors and the cGAS-STING pathways. IRF3 promotes weight gain, primarily by inhibiting adipose thermogenesis, and also induces inflammation and insulin resistance using both weight-dependent and weight-independent mechanisms. IRF4, meanwhile, is generally pro-thermogenic and anti-inflammatory and has profound effects on lipogenesis and lipolysis. Finally, new data are emerging on the role of other IRF family members in metabolic homeostasis. Taken together, data indicate that IRFs serve as critical yet underappreciated integrators of metabolic and inflammatory stress.
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Affiliation(s)
- Zunair Ahmad
- School of Medicine, Royal College of Surgeons in Ireland, Medical University of Bahrain, Busaiteen, Bahrain
| | - Wahab Kahloan
- AdventHealth Orlando Family Medicine, Orlando, FL, USA
| | - Evan D Rosen
- Division of Endocrinology, Diabetes, and Metabolism, Beth Israel Deaconess Medical Center, Boston, MA, USA.
- Harvard Medical School, Boston, MA, USA.
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2
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Zeng F, Li Y, Zhang X, Feng J, Gu W, Shen L, Huang W. Arctium lappa L. roots inhibit the intestinal inflammation of dietary obese rats through TLR4/NF-κB pathway. Heliyon 2023; 9:e21562. [PMID: 38027866 PMCID: PMC10663856 DOI: 10.1016/j.heliyon.2023.e21562] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 10/19/2023] [Accepted: 10/24/2023] [Indexed: 12/01/2023] Open
Abstract
Long-term consumption of Arctium lappa L. roots can lead to weight loss. To explore the relationship between anti-obesity and anti-inflammation, the effects and mechanism of A. lappa L. root powder (ARP) on intestinal inflammation in obese rats were investigated. Dietary obese rats were successfully established by feeding a high-fat and high-sugar diet. The control group (n = 6) consumed a normal diet. The intestines were compared among the groups (each n = 6) with and without the administration of ARP (intragastric 7.5 g/kg·bw/d). Real-time quantitative reverse transcription-polymerase chain reaction and western blotting analysis revealed that ARP effectively inhibited the expression of pro-inflammatory and inflammatory cytokines in the colons of obese rats. These cytokines included interleukin (IL)-1β, IL-8, IL-6, tumor necrosis factor-α (TNF-α), monocyte chemoattractant protein-1, intercellular adhesion molecule-1, and vascular cell adhesion molecule-1. The inhibition rates for all these cytokines exceeded 88 %. Moreover, ARP demonstrated the ability to down-regulate key genes involved in Toll-like receptor 4 (TLR4) complexes, namely Tlr4, myeloid differentiation protein-2 (Md2), and myeloid differentiation factor 88 (Myd88), along with downstream signaling molecules such as tumor necrosis factor receptor associated factor 6 (TRAF6) and nuclear factor-κB (NF-κB), with inhibition rates over 81 %. Additionally, ARP was observed to inhibit protein levels of TLR4, NF-κB, IL-1β, and TNF-α in the colons of obese rats, with inhibition rates of 65.6 ± 10.9 %, 84.4 ± 19.9 %, 80.8 ± 14.4 %, and 68.4 ± 17.5 %, respectively. This study confirmed the effectiveness of ARP in inhibiting intestinal inflammation through the blockade of the TLR4/NF-κB signaling pathway. It also suggested that ARP holds potential in improving intestinal health in the context of obesity, implying its possible application in the prevention and treatment of obesity and related metabolic diseases.
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Affiliation(s)
- Feng Zeng
- Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Medical College, Yangzhou University, Yangzhou, 225000, PR China
- Institute of Agro-Product Processing, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, PR China
| | - Ying Li
- Institute of Agro-Product Processing, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, PR China
| | - Xiaoxiao Zhang
- Institute of Agro-Product Processing, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, PR China
| | - Jin Feng
- Institute of Agro-Product Processing, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, PR China
| | - Wen Gu
- Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, PR China
| | - Li Shen
- Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Medical College, Yangzhou University, Yangzhou, 225000, PR China
| | - Wuyang Huang
- Jiangsu Key Laboratory of Integrated Traditional Chinese and Western Medicine for Prevention and Treatment of Senile Diseases, Medical College, Yangzhou University, Yangzhou, 225000, PR China
- Institute of Agro-Product Processing, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, PR China
- School of Food and Bioengineering, Jiangsu University, Zhenjiang, 212013, PR China
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3
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Liang F, Peng C, Luo X, Wang L, Huang Y, Yin L, Yue L, Yang J, Zhao X. A single-cell atlas of immunocytes in the spleen of a mouse model of Wiskott-Aldrich syndrome. Cell Immunol 2023; 393-394:104783. [PMID: 37944382 DOI: 10.1016/j.cellimm.2023.104783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 08/28/2023] [Accepted: 11/01/2023] [Indexed: 11/12/2023]
Abstract
Wiskott-Aldrich syndrome (WAS) is a disorder characterized by rare X-linked genetic immune deficiency with mutations in the Was gene, which is specifically expressed in hematopoietic cells. The spleen plays a major role in hematopoiesis and red blood cell clearance. However, to date, comprehensive analyses of the spleen in wild-type (WT) and WASp-deficient (WAS-KO) mice, especially at the transcriptome level, have not been reported. In this study, single-cell RNA sequencing (scRNA-seq) was adopted to identify various types of immune cells and investigate the mechanisms underlying immune deficiency. We identified 30 clusters and 10 major cell subtypes among 11,269 cells; these cell types included B cells, T cells, dendritic cells (DCs), natural killer (NK) cells, monocytes, macrophages, granulocytes, stem cells and erythrocytes. Moreover, we evaluated gene expression differences among cell subtypes, identified differentially expressed genes (DEGs), and performed enrichment analyses to identify the reasons for the dysfunction in these different cell populations in WAS. Furthermore, some key genes were identified based on a comparison of the DEGs in each cell type involved in specific and nonspecific immune responses, and further analysis showed that these key genes were previously undiscovered pathology-related genes in WAS-KO mice. In summary, we present a landscape of immune cells in the spleen of WAS-KO mice based on detailed data obtained at single-cell resolution. These unprecedented data revealed the transcriptional characteristics of specific and nonspecific immune cells, and the key genes were identified, laying a foundation for future studies of WAS, especially studies into novel and underexplored mechanisms that may improve gene therapies for WAS.
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Affiliation(s)
- Fangfang Liang
- Department of Rheumatism and Immunology, Children's Hospital of Chongqing Medical University, Chongqing, China; Department of Rheumatism and Immunology, Shenzhen Children's Hospital, Shenzhen, China
| | - Cheng Peng
- Department of Radiology, The Third People's Hospital of Shenzhen, Shenzhen, China
| | - Xianze Luo
- Department of Rheumatism and Immunology, Children's Hospital of Chongqing Medical University, Chongqing, China
| | - Linlin Wang
- Department of Rheumatism and Immunology, Shenzhen Children's Hospital, Shenzhen, China
| | - Yanyan Huang
- Department of Rheumatism and Immunology, Shenzhen Children's Hospital, Shenzhen, China
| | - Le Yin
- Department of Rheumatism and Immunology, Shenzhen Children's Hospital, Shenzhen, China
| | - Luming Yue
- Singleron Biotechnologies, Nanjing, Jiangsu, China
| | - Jun Yang
- Department of Rheumatism and Immunology, Shenzhen Children's Hospital, Shenzhen, China.
| | - Xiaodong Zhao
- Department of Rheumatism and Immunology, Children's Hospital of Chongqing Medical University, Chongqing, China; Ministry of Education Key Laboratory of Child Development and Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China; National Clinical Research Center for Child Health and Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China; China International Science and Technology Cooperation Base of Child Development and Critical Disorders, Children's Hospital of Chongqing Medical University, Chongqing, China; Chongqing Key Laboratory of Child Infection and Immunity, Children's Hospital of Chongqing Medical University, Chongqing, China.
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4
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Ma W, Huang G, Wang Z, Wang L, Gao Q. IRF7: role and regulation in immunity and autoimmunity. Front Immunol 2023; 14:1236923. [PMID: 37638030 PMCID: PMC10449649 DOI: 10.3389/fimmu.2023.1236923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Accepted: 07/25/2023] [Indexed: 08/29/2023] Open
Abstract
Interferon regulatory factor (IRF) 7 was originally identified as master transcriptional factor that produced IFN-I and regulated innate immune response, subsequent studies have revealed that IRF7 performs a multifaceted and versatile functions in multiple biological processes. In this review, we provide a comprehensive overview on the current knowledge of the role of IRF7 in immunity and autoimmunity. We focus on the latest regulatory mechanisms of IRF7 in IFN-I, including signaling pathways, transcription, translation, and post-translational levels, the dimerization and nuclear translocation, and the role of IRF7 in IFN-III and COVID-19. In addition to antiviral immunity, we also discuss the role and mechanism of IRF7 in autoimmunity, and the further research will expand our understanding of IRF7.
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Affiliation(s)
- Wei Ma
- Department of Cell Biology, College of Basic Medical Sciences, Army Medical University (Third Military Medical University), Chongqing, China
- Department of Wound Infection and Drug, State Key Laboratory of Trauma, Burn and Combined Injury, Daping Hospital, Army Medical University (Third Military Medical University), Chongqing, China
| | - Gang Huang
- Department of Oncology, The Second Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China
| | - Zhi Wang
- Department of Cell Biology, College of Basic Medical Sciences, Army Medical University (Third Military Medical University), Chongqing, China
| | - Li Wang
- Department of Cell Biology, College of Basic Medical Sciences, Army Medical University (Third Military Medical University), Chongqing, China
| | - Qiangguo Gao
- Department of Cell Biology, College of Basic Medical Sciences, Army Medical University (Third Military Medical University), Chongqing, China
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5
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Huang LY, Chiu CJ, Hsing CH, Hsu YH. Interferon Family Cytokines in Obesity and Insulin Sensitivity. Cells 2022; 11:4041. [PMID: 36552805 PMCID: PMC9776768 DOI: 10.3390/cells11244041] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 12/09/2022] [Accepted: 12/12/2022] [Indexed: 12/15/2022] Open
Abstract
Obesity and its associated complications are global public health concerns. Metabolic disturbances and immune dysregulation cause adipose tissue stress and dysfunction in obese individuals. Immune cell accumulation in the adipose microenvironment is the main cause of insulin resistance and metabolic dysfunction. Infiltrated immune cells, adipocytes, and stromal cells are all involved in the production of proinflammatory cytokines and chemokines in adipose tissues and affect systemic homeostasis. Interferons (IFNs) are a large family of pleiotropic cytokines that play a pivotal role in host antiviral defenses. IFNs are critical immune modulators in response to pathogens, dead cells, and several inflammation-mediated diseases. Several studies have indicated that IFNs are involved in the pathogenesis of obesity. In this review, we discuss the roles of IFN family cytokines in the development of obesity-induced inflammation and insulin resistance.
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Affiliation(s)
- Ling-Yu Huang
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan
| | - Chiao-Juno Chiu
- Department of Medical Research, National Taiwan University Hospital, Taipei 100, Taiwan
| | - Chung-Hsi Hsing
- Department of Anesthesiology, Chi Mei Medical Center, Tainan 710, Taiwan
- Department of Medical Research, Chi Mei Medical Center, Tainan 710, Taiwan
| | - Yu-Hsiang Hsu
- Institute of Clinical Medicine, College of Medicine, National Cheng Kung University, Tainan 701, Taiwan
- Clinical Medicine Research Center, National Cheng Kung University Hospital, College of Medicine, National Cheng Kung University, Tainan 704, Taiwan
- Antibody New Drug Research Center, National Cheng Kung University, Tainan 701, Taiwan
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6
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Ragino Y, Polonskaya Y, Spiridonov A, Striukova E, Shcherbakova L, Khudiakova A, Shramko V, Stakhneva E, Kashtanova E. Adipokines, Metabolic Hormones and Their Associations with Abdominal Obesity against a Background of Hyper-LDL-C in Young People. J Pers Med 2022; 12:jpm12111823. [PMID: 36579566 PMCID: PMC9698834 DOI: 10.3390/jpm12111823] [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: 10/04/2022] [Revised: 10/21/2022] [Accepted: 10/31/2022] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND The present study was devoted to the search for possible associations between various adipokines/cytokines associated with the secretory activity of visceral adipocytes, elevated blood levels of LDL-C and abdominal obesity in people under 45 years. METHODS A population sample of Novosibirsk residents (n = 1415) was divided into deciles based on the levels of LDL-C. The study included 158 people, 87 men and 71 women, who had serum LDL-C levels of ≥4.2 mmol/L. Abdominal obesity was found in 50% of people (54% men, 45% women). By multiplex analysis using the human metabolic hormone V3 panel and the human adipokine magnetic bead panel, levels of adipokines and inflammatory markers were determined on a Luminex MAGPIX flow fluorimeter. RESULTS According to multivariate regression analysis (binary logistic regression), the most significant biomolecules, regardless of other factors, associated with the presence of AO against the background of hyper-LDL-C in young people were leptin (direct association) and lipocalin-2 (reverse association), leptin in young men (direct association), and leptin and TNF-alpha in women (direct association). CONCLUSIONS Thus, in young people under 45 years with the presence of two important, potentially atherogenic risk factors-hyper-LDL-C and abdominal obesity-a complex of adipokines and metabolic hormones were associated with the presence of these diseases.
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7
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Blencowe M, Chen X, Zhao Y, Itoh Y, McQuillen CN, Han Y, Shou BL, McClusky R, Reue K, Arnold AP, Yang X. Relative contributions of sex hormones, sex chromosomes, and gonads to sex differences in tissue gene regulation. Genome Res 2022; 32:807-824. [PMID: 35396276 PMCID: PMC9104702 DOI: 10.1101/gr.275965.121] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 03/29/2022] [Indexed: 11/25/2022]
Abstract
Sex differences in physiology and disease in mammals result from the effects of three classes of factors that are inherently unequal in males and females: reversible (activational) effects of gonadal hormones, permanent (organizational) effects of gonadal hormones, and cell-autonomous effects of sex chromosomes, as well as genes driven by these classes of factors. Often, these factors act together to cause sex differences in specific phenotypes, but the relative contribution of each and the interactions among them remain unclear. Here, we used the four core genotypes (FCG) mouse model with or without hormone replacement to distinguish the effects of each class of sex-biasing factors on transcriptome regulation in liver and adipose tissues. We found that the activational hormone levels have the strongest influence on gene expression, followed by the organizational gonadal sex effect, and last, sex chromosomal effect, along with interactions among the three factors. Tissue specificity was prominent, with a major impact of estradiol on adipose tissue gene regulation and of testosterone on the liver transcriptome. The networks affected by the three sex-biasing factors include development, immunity and metabolism, and tissue-specific regulators were identified for these networks. Furthermore, the genes affected by individual sex-biasing factors and interactions among factors are associated with human disease traits such as coronary artery disease, diabetes, and inflammatory bowel disease. Our study offers a tissue-specific account of the individual and interactive contributions of major sex-biasing factors to gene regulation that have broad impact on systemic metabolic, endocrine, and immune functions.
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Affiliation(s)
- Montgomery Blencowe
- Department of Integrative Biology and Physiology, University of California, Los Angeles, California 90095, USA
- Interdepartmental Program of Molecular, Cellular and Integrative Physiology, University of California, Los Angeles, California 90095, USA
| | - Xuqi Chen
- Department of Integrative Biology and Physiology, University of California, Los Angeles, California 90095, USA
- Laboratory of Neuroendocrinology of the Brain Research Institute, University of California, Los Angeles, California 90095, USA
| | - Yutian Zhao
- Department of Integrative Biology and Physiology, University of California, Los Angeles, California 90095, USA
- Interdepartmental Program of Molecular, Cellular and Integrative Physiology, University of California, Los Angeles, California 90095, USA
| | - Yuichiro Itoh
- Department of Integrative Biology and Physiology, University of California, Los Angeles, California 90095, USA
- Laboratory of Neuroendocrinology of the Brain Research Institute, University of California, Los Angeles, California 90095, USA
- Department of Neurology, David Geffen School of Medicine, University of California, Los Angeles, California 90095, USA
| | - Caden N McQuillen
- Department of Integrative Biology and Physiology, University of California, Los Angeles, California 90095, USA
| | - Yanjie Han
- Department of Integrative Biology and Physiology, University of California, Los Angeles, California 90095, USA
| | - Benjamin L Shou
- Department of Integrative Biology and Physiology, University of California, Los Angeles, California 90095, USA
| | - Rebecca McClusky
- Department of Integrative Biology and Physiology, University of California, Los Angeles, California 90095, USA
- Laboratory of Neuroendocrinology of the Brain Research Institute, University of California, Los Angeles, California 90095, USA
| | - Karen Reue
- Department of Human Genetics and Molecular Biology Institute, David Geffen School of Medicine, University of California, Los Angeles, California 90095, USA
| | - Arthur P Arnold
- Department of Integrative Biology and Physiology, University of California, Los Angeles, California 90095, USA
- Interdepartmental Program of Molecular, Cellular and Integrative Physiology, University of California, Los Angeles, California 90095, USA
- Laboratory of Neuroendocrinology of the Brain Research Institute, University of California, Los Angeles, California 90095, USA
| | - Xia Yang
- Department of Integrative Biology and Physiology, University of California, Los Angeles, California 90095, USA
- Interdepartmental Program of Molecular, Cellular and Integrative Physiology, University of California, Los Angeles, California 90095, USA
- Department of Human Genetics and Molecular Biology Institute, David Geffen School of Medicine, University of California, Los Angeles, California 90095, USA
- Institute for Quantitative and Computational Biosciences, University of California, Los Angeles, California 90095, USA
- Molecular Biology Institute, University of California, Los Angeles, California 90095, USA
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8
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Xu Z, Forno E, Acosta-Pérez E, Han YY, Rosser F, Manni ML, Canino G, Chen W, Celedón JC. Differential gene expression in nasal airway epithelium from overweight or obese youth with asthma. Pediatr Allergy Immunol 2022; 33:e13776. [PMID: 35470932 PMCID: PMC9047012 DOI: 10.1111/pai.13776] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 04/07/2022] [Accepted: 04/09/2022] [Indexed: 12/21/2022]
Abstract
BACKGROUND The mechanisms underlying the known link between overweight/obesity and childhood asthma are unclear. We aimed to identify differentially expressed genes and pathways associated with obesity-related asthma through a transcriptomic analysis of nasal airway epithelium. METHODS We compared the whole transcriptome in nasal airway epithelium of youth with overweight or obesity and asthma with that of youth of normal weight and asthma, using RNA sequencing data from a cohort of 235 Puerto Ricans aged 9-20 years (EVA-PR) and an independent cohort of 66 children aged 6-16 years in Pittsburgh (VDKA). Differential expression analysis adjusting for age, sex, sequencing plate number, and sample sorting protocol, and the first five principal components were performed independently in each cohort. Results from the two cohorts were combined in a transcriptome-wide meta-analysis. Gene enrichment and network analyses were performed on top genes. RESULTS In the meta-analysis, 29 genes were associated with obesity-related asthma at an FDR-adjusted p <.05, including pro-inflammatory genes known to be differentially expressed in adipose tissue of obese subjects (e.g., CXCL11, CXCL10, and CXCL9) and several novel genes. Functional enrichment analyses showed that pathways for interferon signaling, and innate and adaptive immune responses were down-regulated in overweight/obese youth with asthma, while pathways related to ciliary structure or function were up-regulated. Upstream regulatory analysis predicted significant inhibition of the IRF7 pathway. Network analyses identified "hub" genes like GBP5 and SOCS1. CONCLUSION Our transcriptome-wide analysis of nasal airway epithelium identified biologically plausible genes and pathways for obesity-related asthma in youth.
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Affiliation(s)
- Zhongli Xu
- Division of Pediatric Pulmonary Medicine, UPMC Children’s Hospital of Pittsburgh, and Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
- School of Medicine, Tsinghua University, Beijing, China
| | - Erick Forno
- Division of Pediatric Pulmonary Medicine, UPMC Children’s Hospital of Pittsburgh, and Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Edna Acosta-Pérez
- Behavioral Sciences Research Institute, University of Puerto Rico, San Juan, PR, USA
| | - Yueh-Ying Han
- Division of Pediatric Pulmonary Medicine, UPMC Children’s Hospital of Pittsburgh, and Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Franziska Rosser
- Division of Pediatric Pulmonary Medicine, UPMC Children’s Hospital of Pittsburgh, and Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Michelle L. Manni
- Division of Pediatric Pulmonary Medicine, UPMC Children’s Hospital of Pittsburgh, and Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Glorisa Canino
- Behavioral Sciences Research Institute, University of Puerto Rico, San Juan, PR, USA
| | - Wei Chen
- Division of Pediatric Pulmonary Medicine, UPMC Children’s Hospital of Pittsburgh, and Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Juan C. Celedón
- Division of Pediatric Pulmonary Medicine, UPMC Children’s Hospital of Pittsburgh, and Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
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9
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Dias AA, Silva CADME, da Silva CO, Linhares NRC, Santos JPS, Vivarini ADC, Marques MÂDM, Rosa PS, Lopes UG, Berrêdo-Pinho M, Pessolani MCV. TLR-9 Plays a Role in Mycobacterium leprae-Induced Innate Immune Activation of A549 Alveolar Epithelial Cells. Front Immunol 2021; 12:657449. [PMID: 34456901 PMCID: PMC8397448 DOI: 10.3389/fimmu.2021.657449] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 07/27/2021] [Indexed: 12/18/2022] Open
Abstract
The respiratory tract is considered the main port of entry of Mycobacterium leprae, the causative agent of leprosy. However, the great majority of individuals exposed to the leprosy bacillus will never manifest the disease due to their capacity to develop protective immunity. Besides acting as a physical barrier, airway epithelium cells are recognized as key players by initiating a local innate immune response that orchestrates subsequent adaptive immunity to control airborne infections. However, to date, studies exploring the interaction of M. leprae with the respiratory epithelium have been scarce. In this work, the capacity of M. leprae to immune activate human alveolar epithelial cells was investigated, demonstrating that M. leprae-infected A549 cells secrete significantly increased IL-8 that is dependent on NF-κB activation. M. leprae was also able to induce IL-8 production in human primary nasal epithelial cells. M. leprae-treated A549 cells also showed higher expression levels of human β-defensin-2 (hβD-2), MCP-1, MHC-II and the co-stimulatory molecule CD80. Furthermore, the TLR-9 antagonist inhibited both the secretion of IL-8 and NF-κB activation in response to M. leprae, indicating that bacterial DNA sensing by this Toll-like receptor constitutes an important innate immune pathway activated by the pathogen. Finally, evidence is presented suggesting that extracellular DNA molecules anchored to Hlp, a histone-like protein present on the M. leprae surface, constitute major TLR-9 ligands triggering this pathway. The ability of M. leprae to immune activate respiratory epithelial cells herein demonstrated may represent a very early event during infection that could possibly be essential to the generation of a protective response.
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Affiliation(s)
- André Alves Dias
- Laboratory of Cellular Microbiology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation (FIOCRUZ), Rio de Janeiro, Brazil
| | | | - Camila Oliveira da Silva
- Laboratory of Cellular Microbiology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation (FIOCRUZ), Rio de Janeiro, Brazil
| | | | - João Pedro Sousa Santos
- Laboratory of Cellular Microbiology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation (FIOCRUZ), Rio de Janeiro, Brazil
| | - Aislan de Carvalho Vivarini
- Laboratory of Molecular Parasitology, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Maria Ângela de Mello Marques
- Mycobacteria Research Laboratories, Department of Microbiology, Immunology and Pathology, Colorado State University (CSU), Fort Collins, CO, United States
| | | | - Ulisses Gazos Lopes
- Laboratory of Molecular Parasitology, Institute of Biophysics Carlos Chagas Filho, Federal University of Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
| | - Márcia Berrêdo-Pinho
- Laboratory of Cellular Microbiology, Oswaldo Cruz Institute, Oswaldo Cruz Foundation (FIOCRUZ), Rio de Janeiro, Brazil
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10
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Gessani S, Belardelli F. Type I Interferons as Joint Regulators of Tumor Growth and Obesity. Cancers (Basel) 2021; 13:cancers13020196. [PMID: 33430520 PMCID: PMC7827047 DOI: 10.3390/cancers13020196] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 12/31/2020] [Accepted: 01/01/2021] [Indexed: 02/07/2023] Open
Abstract
Simple Summary The escalating global epidemic of overweight and obesity is a major public health and economic problem, as excess body weight represents a significant risk factor for several chronic diseases including cancer. Despite the strong scientific evidence for a link between obesity and cancer, the mechanisms involved in this interplay have not yet been fully understood. The aim of this review is to evaluate the role of type I interferons, a family of antiviral cytokines with key roles in the regulation of both obesity and cancer, highlighting how the dysregulation of the interferon system can differently affect these pathological conditions. Abstract Type I interferons (IFN-I) are antiviral cytokines endowed with multiple biological actions, including antitumor activity. Studies in mouse models and cancer patients support the concept that endogenous IFN-I play important roles in the control of tumor development and growth as well as in response to several chemotherapy/radiotherapy treatments. While IFN-I signatures in the tumor microenvironment are often considered as biomarkers for a good prognostic response to antitumor therapies, prolonged IFN-I signaling can lead to immune dysfunction, thereby promoting pathogen or tumor persistence, thus revealing the “Janus face” of these cytokines in cancer control, likely depending on timing, tissue microenvironment and cumulative levels of IFN-I signals. Likewise, IFN-I exhibit different and even opposite effects on obesity, a pathologic condition linked to cancer development and growth. As an example, evidence obtained in mouse models shows that localized expression of IFN-I in the adipose tissue results in inhibition of diet–induced obesity, while hyper-production of these cytokines by specialized cells such as plasmacytoid dendritic cells in the same tissue, can induce systemic inflammatory responses leading to obesity. Further studies in mouse models and humans should reveal the mechanisms by which IFN-I can regulate both tumor growth and obesity and to understand the role of factors such as genetic background, diet and microbioma in shaping the production and action of these cytokines under physiological and pathological conditions.
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Affiliation(s)
- Sandra Gessani
- Center for Gender-Specific Medicine, Istituto Superiore di Sanità, 00161 Rome, Italy
- Correspondence: (S.G.); (F.B.)
| | - Filippo Belardelli
- Institute of Translational Pharmacology, CNR, 00133 Rome, Italy
- Correspondence: (S.G.); (F.B.)
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Kawai T, Autieri MV, Scalia R. Adipose tissue inflammation and metabolic dysfunction in obesity. Am J Physiol Cell Physiol 2020; 320:C375-C391. [PMID: 33356944 DOI: 10.1152/ajpcell.00379.2020] [Citation(s) in RCA: 582] [Impact Index Per Article: 145.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Several lines of preclinical and clinical research have confirmed that chronic low-grade inflammation of adipose tissue is mechanistically linked to metabolic disease and organ tissue complications in the overweight and obese organism. Despite this widely confirmed paradigm, numerous open questions and knowledge gaps remain to be investigated. This is mainly due to the intricately intertwined cross-talk of various pro- and anti-inflammatory signaling cascades involved in the immune response of expanding adipose depots, particularly the visceral adipose tissue. Adipose tissue inflammation is initiated and sustained over time by dysfunctional adipocytes that secrete inflammatory adipokines and by infiltration of bone marrow-derived immune cells that signal via production of cytokines and chemokines. Despite its low-grade nature, adipose tissue inflammation negatively impacts remote organ function, a phenomenon that is considered causative of the complications of obesity. The aim of this review is to broadly present an overview of adipose tissue inflammation by highlighting the most recent reports in the scientific literature and summarizing our overall understanding of the field. We also discuss key endogenous anti-inflammatory mediators and analyze their mechanistic role(s) in the pathogenesis and treatment of adipose tissue inflammation. In doing so, we hope to stimulate studies to uncover novel physiological, cellular, and molecular targets for the treatment of obesity.
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Affiliation(s)
- Tatsuo Kawai
- The Cardiovascular Research Center and The Limole Center for Integrated Lymphatic Research, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania
| | - Michael V Autieri
- The Cardiovascular Research Center and The Limole Center for Integrated Lymphatic Research, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania
| | - Rosario Scalia
- The Cardiovascular Research Center and The Limole Center for Integrated Lymphatic Research, Lewis Katz School of Medicine, Temple University, Philadelphia, Pennsylvania
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