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Malik AA, Shariq M, Sheikh JA, Fayaz H, Srivastava G, Thakuri D, Ahuja Y, Ali S, Alam A, Ehtesham NZ, Hasnain SE. Regulation of Type I Interferon and Autophagy in Immunity against Mycobacterium Tuberculosis: Role of CGAS and STING1. Adv Biol (Weinh) 2024; 8:e2400174. [PMID: 38977406 DOI: 10.1002/adbi.202400174] [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: 03/27/2024] [Revised: 05/22/2024] [Indexed: 07/10/2024]
Abstract
Mycobacterium tuberculosis (M. tb) is a significant intracellular pathogen responsible for numerous infectious disease-related deaths worldwide. It uses ESX-1 T7SS to damage phagosomes and to enter the cytosol of host cells after phagocytosis. During infection, M. tb and host mitochondria release dsDNA, which activates the CGAS-STING1 pathway. This pathway leads to the production of type I interferons and proinflammatory cytokines and activates autophagy, which targets and degrades bacteria within autophagosomes. However, the role of type I IFNs in immunity against M. tb is controversial. While previous research has suggested a protective role, recent findings from cgas-sting1 knockout mouse studies have contradicted this. Additionally, a study using knockout mice and non-human primate models uncovered a new mechanism by which neutrophils recruited to lung infections form neutrophil extracellular traps. Activating plasmacytoid dendritic cells causes them to produce type I IFNs, which interfere with the function of interstitial macrophages and increase the likelihood of tuberculosis. Notably, M. tb uses its virulence proteins to disrupt the CGAS-STING1 signaling pathway leading to enhanced pathogenesis. Investigating the CGAS-STING1 pathway can help develop new ways to fight tuberculosis.
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Affiliation(s)
- Asrar Ahmad Malik
- Department of Life Sciences, Sharda School of Basic Sciences and Research, Sharda University, Knowledge Park III, Greater Noida, Uttar Pradesh, 201306, India
| | - Mohd Shariq
- ICMR-National Institute of Pathology, Ansari Nagar West, New Delhi, 110029, India
| | - Javaid Ahmad Sheikh
- Department of Biotechnology, School of Chemical and Life Sciences, Jamia Hamdard, Hamdard Nagar, New Delhi, 110062, India
| | - Haleema Fayaz
- Department of Life Sciences, Sharda School of Basic Sciences and Research, Sharda University, Knowledge Park III, Greater Noida, Uttar Pradesh, 201306, India
| | - Gauri Srivastava
- Department of Life Sciences, Sharda School of Basic Sciences and Research, Sharda University, Knowledge Park III, Greater Noida, Uttar Pradesh, 201306, India
| | - Deeksha Thakuri
- Department of Life Sciences, Sharda School of Basic Sciences and Research, Sharda University, Knowledge Park III, Greater Noida, Uttar Pradesh, 201306, India
| | - Yashika Ahuja
- Department of Life Sciences, Sharda School of Basic Sciences and Research, Sharda University, Knowledge Park III, Greater Noida, Uttar Pradesh, 201306, India
| | - Saquib Ali
- Department of Life Sciences, Sharda School of Basic Sciences and Research, Sharda University, Knowledge Park III, Greater Noida, Uttar Pradesh, 201306, India
| | - Anwar Alam
- Department of Life Sciences, Sharda School of Basic Sciences and Research, Sharda University, Knowledge Park III, Greater Noida, Uttar Pradesh, 201306, India
| | - Nasreen Z Ehtesham
- Department of Life Sciences, Sharda School of Basic Sciences and Research, Sharda University, Knowledge Park III, Greater Noida, Uttar Pradesh, 201306, India
| | - Seyed E Hasnain
- Department of Life Sciences, Sharda School of Basic Sciences and Research, Sharda University, Knowledge Park III, Greater Noida, Uttar Pradesh, 201306, India
- Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology, Delhi (IIT-D), Hauz Khas, New Delhi, 110 016, India
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Sorge M, Savoré G, Gallo A, Acquarone D, Sbroggiò M, Velasco S, Zamporlini F, Femminò S, Moiso E, Morciano G, Balmas E, Raimondi A, Nattenberg G, Stefania R, Tacchetti C, Rizzo AM, Corsetto P, Ghigo A, Turco E, Altruda F, Silengo L, Pinton P, Raffaelli N, Sniadecki NJ, Penna C, Pagliaro P, Hirsch E, Riganti C, Tarone G, Bertero A, Brancaccio M. An intrinsic mechanism of metabolic tuning promotes cardiac resilience to stress. EMBO Mol Med 2024:10.1038/s44321-024-00132-z. [PMID: 39271959 DOI: 10.1038/s44321-024-00132-z] [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: 05/22/2024] [Revised: 08/08/2024] [Accepted: 08/09/2024] [Indexed: 09/15/2024] Open
Abstract
Defining the molecular mechanisms underlying cardiac resilience is crucial to find effective approaches to protect the heart. A physiologic level of ROS is produced in the heart by fatty acid oxidation, but stressful events can boost ROS and cause mitochondrial dysfunction and cardiac functional impairment. Melusin is a muscle specific chaperone required for myocardial compensatory remodeling during stress. Here we report that Melusin localizes in mitochondria where it binds the mitochondrial trifunctional protein, a key enzyme in fatty acid oxidation, and decreases it activity. Studying both mice and human induced pluripotent stem cell-derived cardiomyocytes, we found that Melusin reduces lipid oxidation in the myocardium and limits ROS generation in steady state and during pressure overload and doxorubicin treatment, preventing mitochondrial dysfunction. Accordingly, the treatment with the lipid oxidation inhibitor Trimetazidine concomitantly with stressful stimuli limits ROS accumulation and prevents long-term heart dysfunction. These findings disclose a physiologic mechanism of metabolic regulation in the heart and demonstrate that a timely restriction of lipid metabolism represents a potential therapeutic strategy to improve cardiac resilience to stress.
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Affiliation(s)
- Matteo Sorge
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy.
| | - Giulia Savoré
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Andrea Gallo
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Davide Acquarone
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Mauro Sbroggiò
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Silvia Velasco
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Federica Zamporlini
- Department of Agricultural, Food and Environmental Sciences, Polytechnic University of Marche, Ancona, 60121, Italy
| | - Saveria Femminò
- Department of Clinical and Biological Sciences, University of Turin, Orbassano, 10043, Italy
| | - Enrico Moiso
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Giampaolo Morciano
- Department of Medical Sciences, University of Ferrara, Ferrara, 44121, Italy
- Maria Cecilia Hospital, GVM Care and Research, Cotignola, 48033, Italy
| | - Elisa Balmas
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Andrea Raimondi
- Experimental Imaging Centre, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) San Raffaele Scientific Institute, Milan, 20132, Italy
| | - Gabrielle Nattenberg
- Departments of Mechanical Engineering, Bioengineering, and Laboratory Medicine and Pathology, Institute for Stem Cell and Regenerative Medicine, and Center for Cardiovascular Biology, University of Washington, Seattle, WA, 98109, USA
| | - Rachele Stefania
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Carlo Tacchetti
- Experimental Imaging Centre, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS) San Raffaele Scientific Institute, Milan, 20132, Italy
| | - Angela Maria Rizzo
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Milano, 20133, Italy
| | - Paola Corsetto
- Department of Pharmacological and Biomolecular Sciences, University of Milan, Milano, 20133, Italy
| | - Alessandra Ghigo
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Emilia Turco
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Fiorella Altruda
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Lorenzo Silengo
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Paolo Pinton
- Department of Medical Sciences, University of Ferrara, Ferrara, 44121, Italy
- Maria Cecilia Hospital, GVM Care and Research, Cotignola, 48033, Italy
| | - Nadia Raffaelli
- Department of Agricultural, Food and Environmental Sciences, Polytechnic University of Marche, Ancona, 60121, Italy
| | - Nathan J Sniadecki
- Departments of Mechanical Engineering, Bioengineering, and Laboratory Medicine and Pathology, Institute for Stem Cell and Regenerative Medicine, and Center for Cardiovascular Biology, University of Washington, Seattle, WA, 98109, USA
| | - Claudia Penna
- Department of Clinical and Biological Sciences, University of Turin, Orbassano, 10043, Italy
| | - Pasquale Pagliaro
- Department of Clinical and Biological Sciences, University of Turin, Orbassano, 10043, Italy
| | - Emilio Hirsch
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Chiara Riganti
- Department of Oncology, University of Turin, Torino, 10126, Italy
| | - Guido Tarone
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Alessandro Bertero
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy
| | - Mara Brancaccio
- Department of Molecular Biotechnologies and Health Sciences, Molecular Biotechnology Center "Guido Tarone", University of Turin, Turin, 10126, Italy.
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Yang Y, Ren C, Xu X, Yang X, Shao W. Decoding the connection between SLE and DNA Sensors: A comprehensive review. Int Immunopharmacol 2024; 137:112446. [PMID: 38878488 DOI: 10.1016/j.intimp.2024.112446] [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: 04/05/2024] [Revised: 06/06/2024] [Accepted: 06/06/2024] [Indexed: 07/11/2024]
Abstract
Systemic lupus erythematosus (SLE) is recognized as a prevalent autoimmune disorder characterized by a multifaceted pathogenesis potentially influenced by a combination of environmental factors, genetic predisposition, and hormonal regulation. The continuous study of immune system activation is especially intriguing. Analysis of blood samples from individuals with SLE reveals an abnormal increase in interferon levels, along with the existence of anti-double-stranded DNA antibodies. This evidence suggests that the development of SLE may be initiated by innate immunity. The presence of abnormal dsDNA fragments can activate DNA sensors within cells, particularly immune cells, leading to the initiation of downstream signaling cascades that result in the upregulation of relevant cytokines and the subsequent initiation of adaptive immune responses, such as B cell differentiation and T cell activation. The intricate pathogenesis of SLE results in DNA sensors exhibiting a wide range of functions in innate immune responses that are subject to variation based on cell types, developmental processes, downstream effector signaling pathways and other factors. The review aims to reorganize how DNA sensors influence signaling pathways and contribute to the development of SLE according to current studies, with the aspiration of furnishing valuable insights for future investigations into the pathological mechanisms of SLE and potential treatment approaches.
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Affiliation(s)
- Yuxiang Yang
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China; Medical School of Tianjin University, Tianjin, China; School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
| | - Changhuai Ren
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China; Medical School of Tianjin University, Tianjin, China
| | - Xiaopeng Xu
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China; Medical School of Tianjin University, Tianjin, China
| | - Xinyi Yang
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China; Medical School of Tianjin University, Tianjin, China; School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
| | - Wenwei Shao
- Academy of Medical Engineering and Translational Medicine, Tianjin University, Tianjin, China; Medical School of Tianjin University, Tianjin, China; State Key Laboratory of Advanced Medical Materials and Devices, Tianjin University, Tianjin, China.
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Vejvisithsakul PP, Thumarat C, Leelahavanichkul A, Hirankan N, Pisitkun T, Paludan SR, Pisitkun P. Elucidating the function of STING in systemic lupus erythematosus through the STING Goldenticket mouse mutant. Sci Rep 2024; 14:13968. [PMID: 38886451 PMCID: PMC11183220 DOI: 10.1038/s41598-024-64495-6] [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: 12/09/2023] [Accepted: 06/09/2024] [Indexed: 06/20/2024] Open
Abstract
The complexity of systemic lupus erythematosus (SLE) arises from intricate genetic and environmental interactions, with STING playing a pivotal role. This study aims to comprehend the function of STING using the pristane-induced lupus (PIL) model in Sting missense mutant mice (Goldenticket or StingGt), which contrasts with previous research using Sting knockout mice. Investigating two-month-old StingGt mice over six months post-PIL induction, we observed a profound reduction in autoimmune markers, including antinuclear and anti-dsDNA antibodies, germinal center B cells, and plasma cells, compared to their wild-type counterparts. A pivotal finding was the marked decrease in IL-17-producing T cells. Notably, the severity of lupus nephritis and pulmonary hemorrhages was significantly diminished in StingGt mice. These findings demonstrate that different genetic approaches to interfere with STING signaling can lead to contrasting outcomes in SLE pathogenesis, which highlights the need for a nuanced understanding of the role of STING in drug development for SLE. In summary, the loss of Sting function in Goldenticket mutant mice rescued autoimmune phenotypes in PIL. This study reveals the critical nature of STING in SLE, suggesting that the method of STING modulation significantly influences disease phenotypes and should be a key consideration in developing targeted therapies.
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Affiliation(s)
- Pichpisith Pierre Vejvisithsakul
- Program in Translational Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Chisanu Thumarat
- Program in Translational Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand
| | - Asada Leelahavanichkul
- Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
- Translational Research in Inflammation and Immunology Research Unit (TRIRU), Department of Microbiology, Chulalongkorn University, Bangkok, Thailand
| | - Nattiya Hirankan
- Centre of Excellent in Immunology and Immune-Mediated Diseases, Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Trairak Pisitkun
- Center of Excellence in Systems Biology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | | | - Prapaporn Pisitkun
- Program in Translational Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
- Division of Allergy, Immunology, and Rheumatology, Department of Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
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5
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Alee I, Chantawichitwong P, Leelahavanichkul A, Paludan SR, Pisitkun T, Pisitkun P. The STING inhibitor (ISD-017) reduces glomerulonephritis in 129.B6.Fcgr2b-deficient mice. Sci Rep 2024; 14:11020. [PMID: 38745067 PMCID: PMC11094069 DOI: 10.1038/s41598-024-61597-z] [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: 12/17/2023] [Accepted: 05/07/2024] [Indexed: 05/16/2024] Open
Abstract
The absence of stimulator of interferon genes (STING) in 129.B6.Fcgr2b-deficient mice rescue lupus phenotypes. The administration of a STING inhibitor (ISD017) into the young 129.B6.Fcgr2b-deficient mice prevents lupus nephritis development. This study mainly aimed to evaluate the effects of STING inhibition (ISD107) on established SLE in mice to prove that ISD017 could be a good therapeutic drug to reverse the already set-up autoimmunity and kidney impairment. Twenty-four-week-old Fcgr2b-deficient mice were treated with cyclophosphamide (25 mg/kg, intraperitoneal, once per week), ISD017 (10 mg/kg, intraperitoneal, three times per week), or control vehicle for 8 weeks, and were analyzed for phenotypes. Both ISD017 and cyclophosphamide treatment increased long-term survival and reduced the severity of glomerulonephritis in Fcgr2b-deficient mice. While cyclophosphamide reduced activated B cells (B220+GL-7+), ISD017 decreased activated T cells (CD4+CD69+) and neutrophils (Ly6c+Ly6g+) in Fcgr2b-deficient mice. In addition, ISD017 reduced IL-1β and interferon-inducible genes. In summary, ISD017 treatment in symptomatic 129.B6.Fcgr2b-deficient mice reduced the severity of glomerulonephritis and increased long-term survival. ISD017 worked comparably to cyclophosphamide for treating lupus nephritis in 129.B6.Fcgr2b-deficient mice. ISD017 reduced activated T cells and neutrophils, while cyclophosphamide targeted activated B cells. These results suggested that STING inhibitors can potentially be a new therapeutic drug for treating lupus.
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Affiliation(s)
- Isara Alee
- Center of Excellence in Systems Biology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
- Medical Sciences Program, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Papasara Chantawichitwong
- Center of Excellence in Systems Biology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
- Graduated Program in Molecular Medicine, Faculty of Science, Mahidol University, Salaya, Thailand
| | - Asada Leelahavanichkul
- Center of Excellence in Translational Research in Inflammation and Immunology (CETRII), Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
- Department of Microbiology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Søren R Paludan
- Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Trairak Pisitkun
- Center of Excellence in Systems Biology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
- Epithelial Systems Biology Laboratory, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA.
| | - Prapaporn Pisitkun
- Division of Allergy, Immunology, and Rheumatology, Department of Medicine, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand.
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Yi YS. Roles of the Caspase-11 Non-Canonical Inflammasome in Rheumatic Diseases. Int J Mol Sci 2024; 25:2091. [PMID: 38396768 PMCID: PMC10888639 DOI: 10.3390/ijms25042091] [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: 01/13/2024] [Revised: 02/07/2024] [Accepted: 02/07/2024] [Indexed: 02/25/2024] Open
Abstract
Inflammasomes are intracellular multiprotein complexes that activate inflammatory signaling pathways. Inflammasomes comprise two major classes: canonical inflammasomes, which were discovered first and are activated in response to a variety of pathogen-associated molecular patterns (PAMPs) and danger-associated molecular patterns (DAMPs), and non-canonical inflammasomes, which were discovered recently and are only activated in response to intracellular lipopolysaccharide (LPS). Although a larger number of studies have successfully demonstrated that canonical inflammasomes, particularly the NLRP3 inflammasome, play roles in various rheumatic diseases, including rheumatoid arthritis (RA), infectious arthritis (IR), gouty arthritis (GA), osteoarthritis (OA), systemic lupus erythematosus (SLE), psoriatic arthritis (PA), ankylosing spondylitis (AS), and Sjögren's syndrome (SjS), the regulatory roles of non-canonical inflammasomes, such as mouse caspase-11 and human caspase-4 non-canonical inflammasomes, in these diseases are still largely unknown. Interestingly, an increasing number of studies have reported possible roles for non-canonical inflammasomes in the pathogenesis of various mouse models of rheumatic disease. This review comprehensively summarizes and discusses recent emerging studies demonstrating the regulatory roles of non-canonical inflammasomes, particularly focusing on the caspase-11 non-canonical inflammasome, in the pathogenesis and progression of various types of rheumatic diseases and provides new insights into strategies for developing potential therapeutics to prevent and treat rheumatic diseases as well as associated diseases by targeting non-canonical inflammasomes.
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Affiliation(s)
- Young-Su Yi
- Department of Life Sciences, Kyonggi University, Suwon 16227, Republic of Korea
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Thongboontho R, Petcharat K, Munkong N, Khonthun C, Boondech A, Phromnoi K, Thim-uam A. Effects of Pogonatherum paniceum (Lamk) Hack extract on anti-mitochondrial DNA mediated inflammation by attenuating Tlr9 expression in LPS-induced macrophages. Nutr Res Pract 2023; 17:827-843. [PMID: 37780212 PMCID: PMC10522809 DOI: 10.4162/nrp.2023.17.5.827] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 05/10/2023] [Accepted: 05/19/2023] [Indexed: 10/03/2023] Open
Abstract
BACKGROUND/OBJECTIVES Mitochondrial DNA leakage leads to inflammatory responses via endosome activation. This study aims to evaluate whether the perennial grass water extract (Pogonatherum panicum) ameliorate mitochondrial DNA (mtDNA) leakage. MATERIALS/METHODS The major bioactive constituents of P. paniceum (PPW) were investigated by high-performance liquid chromatography, after which their antioxidant activities were assessed. In addition, RAW 264.7 macrophages were stimulated with lipopolysaccharide, resulting in mitochondrial damage. Quantitative polymerase chain reaction and enzyme-linked immunosorbent assay were used to examine the gene expression and cytokines. RESULTS Our results showed that PPW extract-treated activated cells significantly decrease reactive oxygen species and nitric oxide levels by reducing the p22phox and iNOS expression and lowering cytokine-encoding genes, including IL-6, TNF-α, IL-1β, PG-E2 and IFN-γ relative to the lipopolysaccharide (LPS)-activated macrophages. Furthermore, we observed that LPS enhanced the mtDNA leaked into the cytoplasm, increasing the transcription of Tlr9 and signaling both MyD88/Irf7-dependent interferon and MyD88/NF-κb p65-dependent inflammatory cytokine mRNA expression but which was alleviated in the presence of PPW extract. CONCLUSIONS Our data show that PPW extract has antioxidant and anti-inflammatory activities by facilitating mtDNA leakage and lowering the Tlr9 expression and signaling activation.
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Affiliation(s)
- Rungthip Thongboontho
- Division of Biochemistry, School of Medical Sciences, University of Phayao, Mae Ka 56000, Thailand
| | - Kanoktip Petcharat
- Division of Biochemistry, School of Medical Sciences, University of Phayao, Mae Ka 56000, Thailand
| | - Narongsuk Munkong
- Department of Pathology, School of Medicine, University of Phayao, Mae Ka 56000, Thailand
| | - Chakkraphong Khonthun
- Division of Biochemistry, School of Medical Sciences, University of Phayao, Mae Ka 56000, Thailand
| | - Atirada Boondech
- Biology Program, Faculty of Science and Technology, Kamphaeng Phet Rajabhat University, Nakhon Chum 65000, Thailand
| | - Kanokkarn Phromnoi
- Division of Biochemistry, School of Medical Sciences, University of Phayao, Mae Ka 56000, Thailand
| | - Arthid Thim-uam
- Division of Biochemistry, School of Medical Sciences, University of Phayao, Mae Ka 56000, Thailand
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