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Xu K, Sun G, Wang Y, Luo H, Wang Y, Liu M, Liu H, Lu X, Qin X. Mitigating radiation-induced brain injury via NLRP3/NLRC4/Caspase-1 pyroptosis pathway: Efficacy of memantine and hydrogen-rich water. Biomed Pharmacother 2024; 177:116978. [PMID: 38906028 DOI: 10.1016/j.biopha.2024.116978] [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: 04/10/2024] [Revised: 06/02/2024] [Accepted: 06/15/2024] [Indexed: 06/23/2024] Open
Abstract
Radiation-induced brain injury (RIBI) is a significant challenge in radiotherapy for head and neck tumors, impacting patients' quality of life. In exploring potential treatments, this study focuses on memantine hydrochloride and hydrogen-rich water, hypothesized to mitigate RIBI through inhibiting the NLRP3/NLRC4/Caspase-1 pathway. In a controlled study involving 40 Sprague-Dawley rats, divided into five groups including a control and various treatment groups, we assessed the effects of these treatments on RIBI. Post-irradiation, all irradiated groups displayed symptoms like weight loss and salivation, with notable variations among different treatment approaches. Particularly, hydrogen-rich water showed a promising reduction in these symptoms. Histopathological analysis indicated substantial hippocampal damage in the radiation-only group, while the groups receiving memantine and/or hydrogen-rich water exhibited significant mitigation of such damage. Molecular studies, revealed a decrease in oxidative stress markers and an attenuated inflammatory response in the treatment groups. Immunohistochemistry further confirmed these molecular changes, suggesting the effectiveness of these agents. Echoing recent scientific inquiries into the protective roles of specific compounds against radiation-induced damages, our study adds to the growing body of evidence on the potential of memantine and hydrogen-rich water as novel therapeutic strategies for RIBI.
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Affiliation(s)
- Kai Xu
- Shanxi Provincial Key Laboratory of Drug Toxicology and Radiation Damage Drugs, Department of Radiology and Environmental Medicine, Co-innovation Center for Radiation Medicine, China Institute for Radiation Protection, Taiyuan 030006, China
| | - Ge Sun
- Shanxi Provincial Key Laboratory of Drug Toxicology and Radiation Damage Drugs, Department of Radiology and Environmental Medicine, Co-innovation Center for Radiation Medicine, China Institute for Radiation Protection, Taiyuan 030006, China
| | - Yuhao Wang
- Shanxi Provincial Key Laboratory of Drug Toxicology and Radiation Damage Drugs, Department of Radiology and Environmental Medicine, Co-innovation Center for Radiation Medicine, China Institute for Radiation Protection, Taiyuan 030006, China
| | - Hao Luo
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy, Nankai University, Tianjin 300353, China
| | - Yong Wang
- Fenyang Hospital, Shanxi Province, Shanxi Medical University, Fenyang, Shanxi 032200, China
| | - Mengya Liu
- Shanxi Provincial Key Laboratory of Drug Toxicology and Radiation Damage Drugs, Department of Radiology and Environmental Medicine, Co-innovation Center for Radiation Medicine, China Institute for Radiation Protection, Taiyuan 030006, China
| | - Huan Liu
- Shanxi Provincial Key Laboratory of Drug Toxicology and Radiation Damage Drugs, Department of Radiology and Environmental Medicine, Co-innovation Center for Radiation Medicine, China Institute for Radiation Protection, Taiyuan 030006, China
| | - Xiaoyu Lu
- School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Xiujun Qin
- Shanxi Provincial Key Laboratory of Drug Toxicology and Radiation Damage Drugs, Department of Radiology and Environmental Medicine, Co-innovation Center for Radiation Medicine, China Institute for Radiation Protection, Taiyuan 030006, China.
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Wang X, Wu FP, Huang YR, Li HD, Cao XY, You Y, Meng ZF, Sun KY, Shen XY. Matrine suppresses NLRP3 inflammasome activation via regulating PTPN2/JNK/SREBP2 pathway in sepsis. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2023; 109:154574. [PMID: 36610161 DOI: 10.1016/j.phymed.2022.154574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Revised: 11/17/2022] [Accepted: 11/20/2022] [Indexed: 06/17/2023]
Abstract
BACKGROUND Sepsis is defined as life-threatening organ dysfunction caused by a dysregulated host response to infection. Abnormal activation of NOD-like receptor thermal protein domain associated protein 3 (NLRP3) inflammasome plays a vital role in the pathogenesis of sepsis. Matrine is proved to show good anti-inflammatory properties, whereas its effect and the underlying molecular machinery on sepsis remains unclear. PURPOSE The aim of this study is to evaluate the effect and mechanism of Matrine on sepsis. STUDY DESIGN THP-1 cells and J774A.1 cells were stimulated by lipopolysaccharide (LPS) with nigericin or adenosine triphosphate (ATP) to establish an in vitro model. Cecal ligation and puncture (CLP)-induced sepsis mouse model was used. Matrine was given by gavage. METHODS To investigate the NLRP3 inflammasome activation, phorbol myristate acetate (PMA)-induced THP-1 cells were first primed with LPS and then stimulated by matrine, followed by treatment with nigericin or ATP. The concentration of interleukin 1β (IL-1β) and interleukin 18 (IL-18) in the cell culture supernatant was detected. The mechanism was explored by cell death assay, immunoblots and immunofluorescence in vitro. C57BL/6 mice were intragastrically administered with matrine for 5 days before CLP. The therapeutic effect of matrine was evaluated by symptoms, pathological analysis, ELISA and RT-qPCR. RESULTS Our results revealed that matrine inhibited IL-1β and IL-18 secretion, suppressed caspase-1 activation, reduced cell death, and blocked ASC speck formation upon NLRP3 inflammasome activation. Furthermore, matrine restrains NLRP3 inflammasome activation as well as pyroptosis through regulating the protein tyrosine phosphatase non-receptor type 2 (PTPN2)/JNK/SREBP2 signaling. Matrine also prominently improved the symptoms and pathological changes with reduced levels of TNF-α, IL-1β, and IL-6 in the lung tissues and serum in a dose-dependent manner. CONCLUSION Matrine effectively alleviates the symptoms of CLP-induced sepsis in mice, restrains NLRP3 inflammasome activation by regulating PTPN2/JNK/SREBP2 signaling pathway, and may become a promising therapeutic agent for sepsis treatment.
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Affiliation(s)
- Xu Wang
- Minhang Hospital and Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, China
| | - Fu-Peng Wu
- Department of Emergency, Minhang Hospital, Fudan University, Shanghai, China
| | - Yu-Ran Huang
- Minhang Hospital and Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, China
| | - Hai-Dong Li
- Minhang Hospital and Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, China
| | - Xin-Yue Cao
- Minhang Hospital and Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, China
| | - Yan You
- Minhang Hospital and Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, China
| | - Zhe-Feng Meng
- Minhang Hospital, Fudan University, Shanghai, China.
| | - Ke-Yu Sun
- Department of Emergency, Minhang Hospital, Fudan University, Shanghai, China.
| | - Xiao-Yan Shen
- Minhang Hospital and Department of Pharmacology, School of Pharmacy, Fudan University, Shanghai, China.
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Deng Z, Lin B, Liu F, Zhao W. Role of Enterococcus faecalis in refractory apical periodontitis: from pathogenicity to host cell response. J Oral Microbiol 2023; 15:2184924. [PMID: 36891193 PMCID: PMC9987735 DOI: 10.1080/20002297.2023.2184924] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023] Open
Abstract
BACKGROUND Refractory apical periodontitis (RAP) is an oral infectious disease characterised by persistent inflammation, progressive alveolar bone destruction, and delayed bone healing. RAP has received increasing attention, because it cannot be cured after repeated root canal therapies. The aetiology of RAP is related to the complex interplay between the pathogen and its host. However, the exact pathogenesis of RAP remains unclarified and includes several factors, such as microorganism immunogenicity, host immunity and inflammation, and tissue destruction and repair. Enterococcus faecalis is the dominant pathogen involved in RAP, and has evolved multiple strategies to ensure survival, which cause persistent intraradicular and extraradicular infections. OBJECTIVE To review the crucial role of E. faecalis in the pathogenesis of RAP, and open new avenues for prevention and treatment of RAP. METHODS The PubMed and Web of Science databases were searched for pertinent publications, employing the search terms "Enterococcus faecalis", "refractory apical periodontitis", "persistent periapical periodontitis", "pathogenicity", "virulence", "biofilm formation", "dentine tubule", "immune cell", "macrophage", and "osteoblast". RESULTS AND CONCLUSION Besides its high pathogenicity due to various virulence mechanisms, E. faecalis modulates the macrophage and osteoblast responses, including regulated cell death, cell polarisation, cell differentiation, and inflammatory response. An in-depth understanding of the multifaceted host cell responses modulated by E. faecalis will help to design potential future therapeutic strategies and overcome the challenges of sustained infection and delayed tissue healing in RAP.
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Affiliation(s)
- Zilong Deng
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China.,School of Stomatology, Southern Medical University, Guangzhou, China
| | - Binbin Lin
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China.,School of Stomatology, Southern Medical University, Guangzhou, China
| | - Fan Liu
- School of Stomatology, Southern Medical University, Guangzhou, China
| | - Wanghong Zhao
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China.,School of Stomatology, Southern Medical University, Guangzhou, China
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Dai X, Ma R, Jiang W, Deng Z, Chen L, Liang Y, Shao L, Zhao W. Enterococcus faecalis-Induced Macrophage Necroptosis Promotes Refractory Apical Periodontitis. Microbiol Spectr 2022; 10:e0104522. [PMID: 35708336 PMCID: PMC9431707 DOI: 10.1128/spectrum.01045-22] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Accepted: 06/01/2022] [Indexed: 12/01/2022] Open
Abstract
The persistence of residual bacteria, particularly Enterococcus faecalis, contributes to refractory periapical periodontitis, which still lacks effective therapy. The role of receptor-interacting protein kinase 3 (RIPK3)- and mixed lineage kinase domain-like protein (MLKL)-mediated necroptosis, a highly proinflammatory form of regulated cell death, has recently drawn much attention. However, the role of necroptosis in the pathogenesis of refractory periapical periodontitis remains unclear. We investigated whether the RIPK3/MLKL signaling pathway was activated in periapical lesion specimens obtained from patients diagnosed with refractory periapical periodontitis. RIPK3-deficient mice were then used to determine the role of necroptosis under this condition in vivo. We found that the phosphorylation levels of RIPK3 and MLKL were elevated in periapical lesion specimens of patients with refractory periapical periodontitis. In addition, necroptosis was induced in an E. faecalis-infected refractory periapical periodontitis mouse model, in which inhibition of necroptosis by RIPK3 deficiency could markedly alleviate inflammation and bone destruction. Moreover, double-labeling immunofluorescence suggested that macrophage necroptosis may be involved in the development of refractory periapical periodontitis. Then, we established an in vitro macrophage infection model with E. faecalis. E. faecalis infection was found to induce necroptotic cell death in macrophages through the RIPK3/MLKL signaling pathway, which was markedly alleviated by the RIPK3- or MLKL-specific inhibitor. Our study revealed that RIPK3/MLKL-mediated macrophage necroptosis contributes to the development of refractory periapical periodontitis and suggests that inhibitors or treatments targeting necroptosis represent a plausible strategy for the management of refractory periapical periodontitis. IMPORTANCE Oral infectious diseases represent a major neglected global population health challenge, imposing an increasing burden on public health and economy. Refractory apical periodontitis (RAP), mainly caused by Enterococcus faecalis, is a representative oral infectious disease with considerable therapeutic challenges. The interplay between E. faecalis and the host often leads to the activation of programmed cell death. This study identifies an important role of macrophage necroptosis induced by E. faecalis in the pathogenesis of RAP. Manipulating RIPK3/MLKL-mediated necroptosis may represent novel therapeutic targets, not only for RAP but also for other E. faecalis-associated infectious diseases.
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Affiliation(s)
- Xingzhu Dai
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Rongyang Ma
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Weiyi Jiang
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Zilong Deng
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Lijuan Chen
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yuee Liang
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Longquan Shao
- Stomatology Hospital, Southern Medical University, Guangzhou, China
| | - Wanghong Zhao
- Department of Stomatology, Nanfang Hospital, Southern Medical University, Guangzhou, China
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Nrf2 in the Field of Dentistry with Special Attention to NLRP3. Antioxidants (Basel) 2022; 11:antiox11010149. [PMID: 35052653 PMCID: PMC8772975 DOI: 10.3390/antiox11010149] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/06/2022] [Accepted: 01/09/2022] [Indexed: 02/06/2023] Open
Abstract
The aim of this review article was to summarize the functional implications of the nuclear factor E2-related factor or nuclear factor (erythroid-derived 2)-like 2 (Nrf2), with special attention to the NACHT (nucleotide-binding oligomerization), LRR (leucine-rich repeat), and PYD (pyrin domain) domains-containing protein 3 (NLRP3) inflammasome in the field of dentistry. NLRP3 plays a crucial role in the progression of inflammatory and adaptive immune responses throughout the body. It is already known that this inflammasome is a key regulator of several systemic diseases. The initiation and activation of NLRP3 starts with the oral microbiome and its association with the pathogenesis and progression of several oral diseases, including periodontitis, periapical periodontitis, and oral squamous cell carcinoma (OSCC). The possible role of the inflammasome in oral disease conditions may involve the aberrant regulation of various response mechanisms, not only in the mouth but in the whole body. Understanding the cellular and molecular biology of the NLRP3 inflammasome and its relationship to Nrf2 is necessary for the rationale when suggesting it as a potential therapeutic target for treatment and prevention of oral inflammatory and immunological disorders. In this review, we highlighted the current knowledge about NLRP3, its likely role in the pathogenesis of various inflammatory oral processes, and its crosstalk with Nrf2, which might offer future possibilities for disease prevention and targeted therapy in the field of dentistry and oral health.
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Urusova DV, Merriman JA, Gupta A, Chen L, Mathema B, Caparon MG, Khader SA. Rifampin resistance mutations in the rpoB gene of Enterococcus faecalis impact host macrophage cytokine production. Cytokine 2022; 151:155788. [PMID: 35030469 DOI: 10.1016/j.cyto.2021.155788] [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: 06/11/2021] [Revised: 12/06/2021] [Accepted: 12/09/2021] [Indexed: 11/16/2022]
Abstract
Antibiotic-resistant bacteria in the genus Enterococcus are a major cause of nosocomial infections and are an emergent public health concern. Similar to a number of bacterial species, resistance to the antibiotic rifampicin (RifR) in enterococci is associated with mutations in the gene encoding the β subunit of RNA polymerase (rpoB). In Mycobacterium tuberculosis, RifRrpoB mutations alter mycobacterial surface lipid expression and are associated with an altered IL-1 cytokine response in macrophages upon infection. However, it is not clear if RifR mutations modulate host cytokine responses by other bacteria. To address this question, we utilized Enterococcus faecalis (E. faecalis). Here, we treated human monocyte-derived macrophages with heat-inactivated wild type or RifRrpoB mutants of E. faecalis and found that RifR mutations reduced IL-1β cytokine production. However, RifR mutations elicited other potent pro- and anti-inflammatory responses, indicating that they can impact other immune pathways beyond IL-1R1 signaling. Our findings suggest that immunomodulation by mutations in rpoB may be conserved across diverse bacterial species and that subversion of IL-1R1 pathway is shared by RifR bacteria.
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Affiliation(s)
- Darya V Urusova
- Department of Molecular Microbiology, Washington University School of Medicine, Campus Box 8230, 660 S. Euclid Avenue, Saint Louis, MO 63110, United States
| | - Joseph A Merriman
- Department of Molecular Microbiology, Washington University School of Medicine, Campus Box 8230, 660 S. Euclid Avenue, Saint Louis, MO 63110, United States
| | - Ananya Gupta
- Department of Molecular Microbiology, Washington University School of Medicine, Campus Box 8230, 660 S. Euclid Avenue, Saint Louis, MO 63110, United States
| | - Liang Chen
- Hackensack Meridian Health, Center for Discovery and Innovation, Nutley, NJ 07110, United States
| | - Barun Mathema
- Department of Epidemiology, Columbia University Mailman School of Public Health, New York, NY 10032, United States
| | - Michael G Caparon
- Department of Molecular Microbiology, Washington University School of Medicine, Campus Box 8230, 660 S. Euclid Avenue, Saint Louis, MO 63110, United States
| | - Shabaana A Khader
- Department of Molecular Microbiology, Washington University School of Medicine, Campus Box 8230, 660 S. Euclid Avenue, Saint Louis, MO 63110, United States.
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7
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Hussein H, Kishen A. Proteomic profiling reveals engineered chitosan nanoparticles mediated cellular crosstalk and immunomodulation for therapeutic application in apical periodontitis. Bioact Mater 2021; 11:77-89. [PMID: 34938914 PMCID: PMC8665264 DOI: 10.1016/j.bioactmat.2021.09.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 08/22/2021] [Accepted: 09/13/2021] [Indexed: 12/18/2022] Open
Abstract
Macrophages (MQ) are major constituents of chronically inflamed periapical tissues in apical periodontitis. This study aimed to investigate the immunomodulatory effect of engineered bioactive chitosan-based nanoparticles (CSnp) antibiofilm medication on MQ cocultured with periodontal ligament fibroblasts (PdLF). Cells viability, spreading, PdLF migration, and intracellular CSnp uptake were characterized. Tandem Mass Tag-based proteomics was applied to analyze MQ global protein expression profiles after interaction with Enterococcus faecalis biofilm, CSnp-treated biofilm, and CSnp. Secreted inflammatory mediators were analyzed. Following bioinformatics analyses, candidate proteins were validated via targeted proteomics. CSnp maintained cells viability, increased MQ spreading, and PdLF migration (p < 0.05). Transmission electron micrographs demonstrated CSnp internalization via macropinocytosis, clathrin-mediated endocytosis, and phagocytosis. Proteomic analysis revealed that CSnp-treated biofilm upregulated proteins (>1.5-folds, p < 0.05) showed functional enrichment in the pathway of metal sequestration by antimicrobial proteins, while downregulated proteins showed enrichment in ferroptosis. CSnp upregulated proteins exhibiting antioxidant and immunoregulatory properties. Upregulation of SERPINB1 by CSnp (>1.5-folds, p < 0.05) was validated. CSnp-treated biofilm reduced pro-inflammatory IL-1β and nitric oxide but enhanced anti-inflammatory IL-10 and TGF-β1 (p < 0.05). Internalized engineered bioactive CSnp reprogrammed MQ proteomic and cytokine profiles to modulate biofilm-mediated inflammation, and prompted PdLF migration, emphasizing its potential to regulate healing process in the treatment of apical periodontitis. CSnp internalized via macropinocytosis, clathrin-mediated endocytosis, and phagocytosis. Enterococcus faecalis biofilm altered macrophage proteomic profile. Macrophage proteome upon CSnp-treated biofilm interaction was distinct from biofilm. CSnp upregulated proteins with immunoregulatory and antioxidant activities. CSnp reduced proinflammatory but increased anti-inflammatory mediators.
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Affiliation(s)
- Hebatullah Hussein
- The Kishen Lab, Dental Research Institute, University of Toronto, Toronto, ON M5G 1G6, Canada.,Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1G6, Canada.,Faculty of Dentistry, Ain Shams University, Endodontics Department, Cairo, Egypt
| | - Anil Kishen
- The Kishen Lab, Dental Research Institute, University of Toronto, Toronto, ON M5G 1G6, Canada.,Faculty of Dentistry, University of Toronto, Toronto, ON M5G 1G6, Canada.,School of Graduate Studies, University of Toronto, Toronto, ON M5G 1G6, Canada.,Department of Dentistry, Mount Sinai Health System, Mount Sinai Hospital, Toronto, ON M5G 1X5, Canada
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Chi D, Lin X, Meng Q, Tan J, Gong Q, Tong Z. Real-Time Induction of Macrophage Apoptosis, Pyroptosis, and Necroptosis by Enterococcus faecalis OG1RF and Two Root Canal Isolated Strains. Front Cell Infect Microbiol 2021; 11:720147. [PMID: 34513732 PMCID: PMC8427696 DOI: 10.3389/fcimb.2021.720147] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 08/12/2021] [Indexed: 01/03/2023] Open
Abstract
To investigate the effects of two Enterococcus faecalis root canal isolated strains (CA1 and CA2) and of the OG1RF strain on apoptosis, pyroptosis, and necroptosis in macrophages. The virulence factors of E. faecalis CA1 and CA2 pathogenic strains were annotated in the Virulence Factors Database (VFDB). E. faecalis CA1, CA2, and OG1RF strains were used to infect RAW264.7 macrophages (MOI, 100:1). We assessed the viability of intracellular and extracellular bacteria and of macrophages at 2, 6, and 12 h post-infection. We used a live cell imaging analysis system to obtain a dynamic curve of cell death after infection by each of the three E. faecalis strains. At 6 and 12 h post-infection, we quantified the mRNA expression levels of PANoptosis-related genes and proteins by RT-qPCR and western blot, respectively. We identified ultrastructural changes in RAW264.7 cells infected with E. faecalis OG1RF using transmission electron microscopy. We found 145 and 160 virulence factors in the CA1 and CA2 strains, respectively. The extracellular CA1 strains grew faster than the CA2 and OG1RF strains, and the amount of intracellular viable bacteria in the OG1RF group was highest at 6 and 12 h post-infection. The macrophages in the CA1 infection group were the first to reach the maximum PI-positivity in the cell death time point curve. We found the expressions of mRNA expression of caspase-1, GSDMD, caspase-3, MLKL, RIPK3, NLRP3, IL-1β and IL-18 and of proteins cleaved caspase-1, GSDMD, cleaved caspase-3 and pMIKL in the macrophages of the three infection groups to be upregulated (P<0.05). We detected ultrastructural changes of apoptosis, pyroptosis, and necroptosis in macrophages infected with E. faecalis. The three E. faecalis strains induced varying degrees of apoptosis, pyroptosis, and necroptosis that were probably associated with PANoptosis in macrophages. The E. faecalis CA1 strain exhibited faster growth and a higher real-time MOI, and it induced higher expression levels of some PANoptosis-related genes and proteins in the infected macrophages than the other strains tested.
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Affiliation(s)
- Danlu Chi
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Xinwei Lin
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Qingzhen Meng
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Jiali Tan
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Qimei Gong
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Zhongchun Tong
- Hospital of Stomatology, Guanghua School of Stomatology, Sun Yat-sen University, Guangzhou, China.,Guangdong Provincial Key Laboratory of Stomatology, Sun Yat-sen University, Guangzhou, China
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9
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Jiang L, Luo S, Qiu T, Li Q, Jiang C, Sun X, Yang G, Zhang C, Liu X, Jiang L. Bidirectional role of reactive oxygen species during inflammasome activation in acrolein-induced human EAhy926 cells pyroptosis. Toxicol Mech Methods 2021; 31:680-689. [PMID: 34238121 DOI: 10.1080/15376516.2021.1953204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Acrolein, a known toxin in tobacco smoke, has been demonstrated to be associated with inflammatory cardiovascular diseases, such as atherosclerosis. However, the definite mechanism of acrolein-induced inflammation remains unclear. Here, we report that acrolein induces reactive oxygen species (ROS) production in EAhy926 cells. Additionally, acrolein induces EAhy926 cells' inflammatory response and pyroptosis by activating NOD-like receptor protein 3 (NLRP3) inflammasome. Also, acrolein-induced cytotoxicity could be attenuated by N-acetyl-L-cysteine (NAC). Furthermore, acrolein upregulates the level of autophagy which can be reversed by NAC. Notably, the present study also indicates that autophagy inhibited by inhibitor 3-methyladenine (3MA) and siAtg7 exacerbate acrolein-induced NLRP3 inflammasome activation and pyroptosis. In summary, acrolein induced cytotoxicity by ROS-mediated NLRP3 inflammasome activation, and ROS upregulates the level of autophagy to inhibit the NLRP3 inflammasome excessive activation, indicating the bidirectional role of ROS in acrolein-induced cellular inflammation. Our results may provide novel mechanistic insights into acrolein-induced cardiovascular toxicity.
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Affiliation(s)
- Liping Jiang
- Preventive Medicine Laboratory, College of Public Health, Dalian Medical University, Dalian, Liaoning, China
| | - Songsong Luo
- Department of Internal Medicine, The Affiliated Zhong Shan Hospital of Dalian University, Dalian, Liaoning, China
| | - Tianming Qiu
- Department of Occupational and Environmental Health, College of Public Health, Dalian Medical University, Dalian, Liaoning, China
| | | | - Chunteng Jiang
- Department of Internal Medicine, The Affiliated Zhong Shan Hospital of Dalian University, Dalian, Liaoning, China
| | - Xiance Sun
- Department of Occupational and Environmental Health, College of Public Health, Dalian Medical University, Dalian, Liaoning, China
| | - Guang Yang
- Department of Nutrition and Food Safety, College of Public Health, Dalian Medical University, Dalian, Liaoning, China
| | - Cong Zhang
- Department of Nutrition and Food Safety, College of Public Health, Dalian Medical University, Dalian, Liaoning, China
| | - Xiaofang Liu
- Department of Nutrition and Food Safety, College of Public Health, Dalian Medical University, Dalian, Liaoning, China
| | - Lijie Jiang
- Department of Internal Medicine, The Affiliated Zhong Shan Hospital of Dalian University, Dalian, Liaoning, China
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10
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Ran S, Huang J, Liu B, Gu S, Jiang W, Liang J. Enterococcus Faecalis activates NLRP3 inflammasomes leading to increased interleukin-1 beta secretion and pyroptosis of THP-1 macrophages. Microb Pathog 2021; 154:104761. [PMID: 33524566 DOI: 10.1016/j.micpath.2021.104761] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Revised: 01/23/2021] [Accepted: 01/24/2021] [Indexed: 12/17/2022]
Abstract
OBJECTIVES Enterococcus faecalis is the bacterial species closely related to persistent infection in root canals. Interleukin-1 beta (IL-1β) is the most commonly detected proinflammatory cytokine in periapical granulation tissue and plays a critical role in host defenses against microbial infection. The synthesis and secretion of IL-1β are mediated mainly by Toll-like receptors and inflammasome activation. The previous study found that the nucleotide-binding oligomerization domain-like receptor protein 3 (NLRP3) and the absent in Melanoma 2 (AIM2) inflammasomes are positively expressed in periapical granulation tissue. The aim of this study was to investigate the pathogenicity of E. faecalis and the molecular mechanisms of IL-1β secretion by THP-1 macrophages infected with E. faecalis. METHODS The IL-1β and lactate dehydrogenase (LDH) levels induced by E. faecalis were investigated with enzyme-linked immunosorbent assay (ELISA) kit and cytotoxicity assay kit, caspase-1 and inflammasome expression levels were investigated using real time PCR and Western blot analysis. Then the effect of caspase-1, NLRP3, adenosine triphosphate (ATP), and extracellular K+ on IL-1β and LDH secretion, Gasdermin-D (GSDMD) cleavage induced by E. faecalis were analyzed. RESULTS E. faecalis significantly increased IL-1β and LDH release, caspase-1 and GSDMD cleavage, and NLRP3 inflammasome activation. It also showed that IL-1β and LDH release, GSDMD cleavage required caspase-1 and NLRP3 activation. Furthermore, the expression and activation of caspase-1 and NLRP3 were blocked by oxidized ATP and extracellular K+. CONCLUSION E. faecalis infection activated caspase-1 and the NLRP3 inflammasome to induce IL-1β secretion and inflammatory cell death (pyroptosis). Furthermore, the activation and expression of NLRP3 induced by E. faecalis required P2X7R and K+ efflux. This study furthers our understanding of the inflammatory response mechanism induced by E. faecalis indicates that NLRP3 may be a potential target for treatment and prevention of persistent periodontitis caused by E. faecalis.
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Affiliation(s)
- Shujun Ran
- Department of Endodontics and Operative Dentistry, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Center of Stomatology, Shanghai, China
| | - Jing Huang
- Department of Endodontics and Operative Dentistry, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Center of Stomatology, Shanghai, China
| | - Bin Liu
- Department of Endodontics and Operative Dentistry, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Center of Stomatology, Shanghai, China
| | - Shensheng Gu
- Department of Endodontics and Operative Dentistry, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Center of Stomatology, Shanghai, China
| | - Wei Jiang
- Department of Endodontics and Operative Dentistry, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Center of Stomatology, Shanghai, China.
| | - Jingping Liang
- Department of Endodontics and Operative Dentistry, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology, National Clinical Research Center of Stomatology, Shanghai, China.
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Parvekar P, Palaskar J, Metgud S, Maria R, Dutta S. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of silver nanoparticles against Staphylococcus aureus. Biomater Investig Dent 2020; 7:105-109. [PMID: 32939454 PMCID: PMC7470068 DOI: 10.1080/26415275.2020.1796674] [Citation(s) in RCA: 103] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2020] [Accepted: 07/09/2020] [Indexed: 12/13/2022] Open
Abstract
AIM To determine the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of silver nanoparticles against Staphylococcus aureus (S. aureus).Methodology: The antimicrobial efficacy of the silver nanoparticles was determined by the standard methods of Clinical and Laboratory Standards Institute (CLSI). Different concentrations of silver nanoparticles were prepared, and MIC was calculated by tube macro-dilution method. The MBC was determined by the lowest concentration that kills 99.9% of the initial bacterial population. The data were analyzed by ANOVA and Tukey's post hoc test using SPSS software. RESULTS The MIC and MBC of silver nanoparticles against S. aureus was found to be 0.625 mg/ml. CONCLUSION The result obtained from this study shows that silver nanoparticles have potential bactericidal effects against S. aureus at a concentration of 0.625 mg/ml. Silver nanoparticles can be incorporated in the root canal medicaments, sealers and irrigants as it possess potent antimicrobial efficacy against S. aureus.
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Affiliation(s)
- Prashik Parvekar
- Pacific Academy of Higher Education, Research University, Udaipur, India
| | - Jayant Palaskar
- Department of Prosthodontics, Sinhagad Dental College, Pune, India
| | - Sandeep Metgud
- Department of Endodontics, Pacific Dental College, Udaipur, India
| | - Rahul Maria
- Department of Endodontics, Bhabha College of Dental Sciences, Bhopal, India
| | - Smita Dutta
- Department of Endodontics, College of Dental Medicine, Qassim University, Kingdom of Saudi Arabia
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Kong DL, Kong FY, Liu XY, Yan C, Cui J, Tang RX, Zheng KY. Soluble egg antigen of Schistosoma japonicum induces pyroptosis in hepatic stellate cells by modulating ROS production. Parasit Vectors 2019; 12:475. [PMID: 31610797 PMCID: PMC6791022 DOI: 10.1186/s13071-019-3729-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 09/23/2019] [Indexed: 02/08/2023] Open
Abstract
BACKGROUND Inflammation-induced dysfunction of hepatic stellate cells (HSCs) is involved in schistosomiasis-associated liver fibrosis, and soluble egg antigen (SEA) is a crucial pathogen-associated molecular pattern associated with liver injury in schistosomiasis. In addition, numerous studies have shown that caspase-1-mediated pyroptosis participates in the development of multiple inflammation-related diseases. However, whether pyroptotic cell death of HSCs is involved in SEA-mediated liver damage is not well understood. METHODS Primary cultured HSCs and Schistosoma japonicum-infected mouse liver tissue were analysed for histological changes and caspase-1 activation, and the role of pyroptosis in the mechanisms underlying SEA-induced HSC death was investigated. Accumulation of reactive oxygen species (ROS) in infected livers and SEA-stimulated HSCs was measured by flow cytometry and immunofluorescence. RESULTS Caspase-1 activity was elevated in both liver tissues and HSCs of S. japonicum-infected mice. Furthermore, SEA stimulation increased the proportion of pyroptotic HSCs, as shown by lactate dehydrogenase (LDH) release assays and by flow cytometric analysis of propidium iodide (PI) and caspase-1 double staining in cells. In addition, ROS generation was elevated in infected liver tissues and SEA-stimulated HSCs, and ROS inhibition downregulated SEA-induced caspase-1 activation and pyroptosis in HSCs. CONCLUSIONS Our present study demonstrates that pyroptotic cell death in HSCs induced by SEA via ROS-mediated caspase-1 activation may serve as a significant mechanism to initiate the inflammatory response and thereby exacerbate liver injury during S. japonicum infection.
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Affiliation(s)
- De-Long Kong
- Jiangsu Key Laboratory of Immunity and Metabolism, Department of Pathogenic Biology and Immunology, Laboratory of Infection and Immunity, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, People's Republic of China
| | - Fan-Yun Kong
- Jiangsu Key Laboratory of Immunity and Metabolism, Department of Pathogenic Biology and Immunology, Laboratory of Infection and Immunity, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, People's Republic of China
| | - Xiang-Ye Liu
- Jiangsu Key Laboratory of Immunity and Metabolism, Department of Pathogenic Biology and Immunology, Laboratory of Infection and Immunity, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, People's Republic of China
| | - Chao Yan
- Jiangsu Key Laboratory of Immunity and Metabolism, Department of Pathogenic Biology and Immunology, Laboratory of Infection and Immunity, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, People's Republic of China
| | - Jie Cui
- Department of Physiology, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, People's Republic of China
| | - Ren-Xian Tang
- Jiangsu Key Laboratory of Immunity and Metabolism, Department of Pathogenic Biology and Immunology, Laboratory of Infection and Immunity, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, People's Republic of China.
| | - Kui-Yang Zheng
- Jiangsu Key Laboratory of Immunity and Metabolism, Department of Pathogenic Biology and Immunology, Laboratory of Infection and Immunity, Xuzhou Medical University, Xuzhou, 221004, Jiangsu, People's Republic of China.
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Li H, Zhong X, Chen Z, Li W. Suppression of NLRP3 inflammasome improves alveolar bone defect healing in diabetic rats. J Orthop Surg Res 2019; 14:167. [PMID: 31146750 PMCID: PMC6543640 DOI: 10.1186/s13018-019-1215-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/09/2019] [Accepted: 05/23/2019] [Indexed: 02/05/2023] Open
Abstract
Background Excessive inflammatory response under hyperglycemia can impair alveolar bone defect healing under diabetic conditions. NLRP3 (NACHT [nucleotide-binding oligomerization], LRR [leucine-rich repeat], and PYD [pyrin domain] domains-containing protein 3) inflammasome has been considered to play a crucial role in the inflammatory response, but its correlation with the impaired alveolar bone repair in diabetes still remains unclarified. The objective of the current study is to investigate the effect of NLRP3 inflammasome inhibition by a lentiviral short hairpin RNA (shRNA) targeting NLRP3 on alveolar bone defect healing in diabetic rats. Methods Diabetes was induced in rats by high-fat diet and streptozotocin injection, and alveolar bone defects in both maxillae were created by surgery. Then, the lentiviral shRNA targeting NLRP3 was applied in the defect. Eight weeks after surgery, the alveolar bone regeneration was examined using hematoxylin and eosin (H&E) staining, and the gene expression in the bone healing site was detected using quantitative real-time reverse transcription polymerase chain reaction (qRT-PCR) analysis and western blot analysis. Results H&E staining showed that treatment with lentiviral shRNA targeting NLRP3 could increase the bone regeneration score in the alveolar bone defect of diabetic rats. Additionally, qRT-PCR analysis and western blot analysis of the bone defect demonstrated that this shRNA inhibited the expression of NLRP3, apoptosis-associated speck-like protein containing a CARD, caspase-1, and proinflammatory cytokine interleukin-1β and increased the expression of osteogenic markers Runt-related transcription factor 2 and osteocalcin. Conclusions Our findings suggested that inhibition of NLRP3 inflammasome could improve alveolar bone defect healing in diabetic rats. The beneficial effect may correlate with reduced proinflammatory cytokine production and increased osteogenic gene expression in hyperglycemia. Electronic supplementary material The online version of this article (10.1186/s13018-019-1215-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Hao Li
- Department of Prosthodontics, The Affiliated Hospital of Stomatology, Guangxi Medical University, 10 Shuangyong Road, Nanning, 530021, People's Republic of China.
| | - Xinghua Zhong
- Department of Prosthodontics, The Affiliated Hospital of Stomatology, Guangxi Medical University, 10 Shuangyong Road, Nanning, 530021, People's Republic of China
| | - Zhiyong Chen
- Department of Prosthodontics, The Affiliated Hospital of Stomatology, Guangxi Medical University, 10 Shuangyong Road, Nanning, 530021, People's Republic of China
| | - Wei Li
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, 14 3rd Section S Renmin Road, Chengdu, 610041, People's Republic of China
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Loss H, Aschenbach JR, Ebner F, Tedin K, Lodemann U. Effects of a pathogenic ETEC strain and a probiotic Enterococcus faecium strain on the inflammasome response in porcine dendritic cells. Vet Immunol Immunopathol 2018; 203:78-87. [DOI: 10.1016/j.vetimm.2018.08.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 07/18/2018] [Accepted: 08/12/2018] [Indexed: 01/27/2023]
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Ran S, Chu M, Gu S, Wang J, Liang J. Enterococcus faecalis
induces apoptosis and pyroptosis of human osteoblastic MG63 cells via the NLRP3 inflammasome. Int Endod J 2018; 52:44-53. [PMID: 29904931 DOI: 10.1111/iej.12965] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 06/12/2018] [Indexed: 01/17/2023]
Affiliation(s)
- S. Ran
- Department of Endodontics and Operative Dentistry; Ninth People's Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology; National Clinical Research Center of Stomatology; Shanghai China
| | - M. Chu
- Department of Endodontics and Operative Dentistry; Ninth People's Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology; National Clinical Research Center of Stomatology; Shanghai China
| | - S. Gu
- Department of Endodontics and Operative Dentistry; Ninth People's Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology; National Clinical Research Center of Stomatology; Shanghai China
| | - J. Wang
- Department of Endodontics and Operative Dentistry; Ninth People's Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology; National Clinical Research Center of Stomatology; Shanghai China
| | - J. Liang
- Department of Endodontics and Operative Dentistry; Ninth People's Hospital; Shanghai Jiao Tong University School of Medicine; Shanghai China
- Shanghai Key Laboratory of Stomatology & Shanghai Research Institute of Stomatology; National Clinical Research Center of Stomatology; Shanghai China
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Bullon P, Pavillard LE, de la Torre-Torres R. Inflammasome and Oral Diseases. EXPERIENTIA SUPPLEMENTUM (2012) 2018; 108:153-176. [PMID: 30536171 DOI: 10.1007/978-3-319-89390-7_7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
One of the main steps in the development of the life in the earth is multicellularity. It enables cell differentiation and the development of morphological structures within an organism and is an essential factor in how to recognize friendly cells that are part of the multicellular organism and which foreign organisms can be harmful. Recognition includes devices such as the major histocompatibility complex (MHC), and the pattern recognition receptors (PRRs). PRRs are a group of proteins expressed by cells of the innate immune system that identify two classes of products: pathogen-associated molecular patterns (PAMPs), related to microbial pathogens, and damage-associated molecular patterns (DAMPs), associated with cell components that are released during cell damage or death. All these activate the inflammasome, which is a multiprotein oligomer that includes caspase 1, PYCARD, NALP, and caspase 5 (also known as caspase 11 or ICH-3). It is responsible for activation of inflammatory processes and has been shown to induce cell pyroptosis, a programmed cell death distinct from apoptosis, and promotes the maturation of the inflammatory cytokines interleukin 1β (IL-1β) and interleukin 18 (IL-18). We review whether inflammasome is related to diseases that can occur in the oral cavity. The mouth is always a possible environment for the development of pathological conditions because of the wide variety of microorganisms. Small variations in the equilibrium of the oral flora can cause disorders that could affect the organism in a systemic form. We provide data on periodontal disease, candidiasis, herpes virus, oral cancer, caries, and other oral diseases. There are very few papers that study this issue; therefore, we need more investigation and publications about inflammatory molecular processes, and more specifically, related to the inflammasome complex.
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Affiliation(s)
- Pedro Bullon
- Departament Periodontology, Facultad de Odontología, Universidad de Sevilla, Sevilla, Spain.
| | - Luis E Pavillard
- Departament Periodontology, Facultad de Odontología, Universidad de Sevilla, Sevilla, Spain
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Wang L, Jin H, Ye D, Wang J, Ao X, Dong M, Niu W. Enterococcus faecalis Lipoteichoic Acid-induced NLRP3 Inflammasome via the Activation of the Nuclear Factor Kappa B Pathway. J Endod 2017; 42:1093-100. [PMID: 27325457 DOI: 10.1016/j.joen.2016.04.018] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 04/11/2016] [Accepted: 04/28/2016] [Indexed: 11/29/2022]
Abstract
INTRODUCTION We wished to examine the effects of the nucleotide-binding oligomerization domain-like receptor protein 3 (NLRP3) inflammasome on periapical periodontitis induced by Enterococcus faecalis and to investigate the molecular mechanisms of lipoteichoic acid (LTA) derived from E. faecalis on the expression of the NLRP3 inflammasome. METHODS A model of periapical periodontitis by sealing E. faecalis into the pulp chambers of rats was established. We then examined the relationship between the expression, location, distribution, and concentration of NLRP3, caspase-1, and interleukin 1β with the inflammatory progression by immunohistochemistry and undertook correlation analyses. RAW264.7 cells were cultured in the absence or presence of LTA together with or without nuclear factor kappa B (NF-κB) inhibitor BAY 11-7082; NLRP3 inflammasome expression was measured by Western blotting, the enzyme-linked immunosorbent assay, and real-time quantitative polymerase chain reaction. An immunofluorescence study was conducted to further detect whether NF-κB can be completely inhibited by BAY 11-7082 or activated by LTA. RESULTS An animal model of periapical periodontitis was established successfully. Expression of NLRP3, caspase-1, and interleukin 1β protein was observed in the inflamed area. The expression of these 3 proteins had a significant positive correlation (P < .05). Overall, our results showed that, compared with the negative control group, LTA could directly activate expression of messenger RNA and protein of the NLRP3 inflammasome (P < .05), whereas BAY 11-7082 inhibited it (P < .05). CONCLUSIONS Our results suggested that LTA can act as a directly stimulating factor associated with expression of the NLRP3 inflammasome during periapical periodontitis, which is mainly linked with the NF-κB signaling activation pathway.
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Affiliation(s)
- Lina Wang
- Department of Endodontics and Periodontics, College of Stomatology, Dalian Medical University, Dalian, Liaoning Province, China
| | - Haiwei Jin
- Department of Oral Basic Science, College of Stomatology, Dalian Medical University, Dalian, Liaoning Province, China
| | - Dandan Ye
- Department of Endodontics and Periodontics, College of Stomatology, Dalian Medical University, Dalian, Liaoning Province, China
| | - Jiaojiao Wang
- Department of Endodontics and Periodontics, College of Stomatology, Dalian Medical University, Dalian, Liaoning Province, China
| | - Xiang Ao
- Department of Endodontics and Periodontics, College of Stomatology, Dalian Medical University, Dalian, Liaoning Province, China
| | - Ming Dong
- Department of Endodontics and Periodontics, College of Stomatology, Dalian Medical University, Dalian, Liaoning Province, China
| | - Weidong Niu
- Department of Endodontics and Periodontics, College of Stomatology, Dalian Medical University, Dalian, Liaoning Province, China.
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Lu WL, Song DZ, Yue JL, Wang TT, Zhou XD, Zhang P, Zhang L, Huang DM. NLRP3 inflammasome may regulate inflammatory response of human periodontal ligament fibroblasts in an apoptosis-associated speck-like protein containing a CARD (ASC)-dependent manner. Int Endod J 2017; 50:967-975. [PMID: 27864974 DOI: 10.1111/iej.12722] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Accepted: 11/14/2016] [Indexed: 02/05/2023]
Affiliation(s)
- W. L. Lu
- Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
- Department of Conservative Dentistry; West China Hospital of Stomatology; Sichuan University; Chengdu China
| | - D. Z. Song
- Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
- Department of Conservative Dentistry; West China Hospital of Stomatology; Sichuan University; Chengdu China
| | - J. L. Yue
- Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
- Department of Conservative Dentistry; West China Hospital of Stomatology; Sichuan University; Chengdu China
| | - T. T. Wang
- Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
| | - X. D. Zhou
- Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
- Department of Conservative Dentistry; West China Hospital of Stomatology; Sichuan University; Chengdu China
| | - P. Zhang
- Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
- Department of Conservative Dentistry; West China Hospital of Stomatology; Sichuan University; Chengdu China
| | - L. Zhang
- Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
- Department of Conservative Dentistry; West China Hospital of Stomatology; Sichuan University; Chengdu China
| | - D. M. Huang
- Key Laboratory of Oral Diseases; West China Hospital of Stomatology; Sichuan University; Chengdu China
- Department of Conservative Dentistry; West China Hospital of Stomatology; Sichuan University; Chengdu China
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Verma V, Dhanda RS, Møller NF, Yadav M. Inflammasomes and Their Role in Innate Immunity of Sexually Transmitted Infections. Front Immunol 2016; 7:540. [PMID: 27994587 PMCID: PMC5136550 DOI: 10.3389/fimmu.2016.00540] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2016] [Accepted: 11/16/2016] [Indexed: 12/15/2022] Open
Abstract
Inflammasomes are multiprotein complexes present in the cytosol as pattern recognition receptors or as sensors of damage-associated molecular patterns. After recognition of microbe-associated molecular patterns or host-derived danger signals, nucleotide oligomerization domain-like receptors oligomerize to form inflammasomes. The activation of inflammasomes results in an alarm, which is raised to alert adjacent cells through the processing and release of a number of other substrates present in the cytosol. A wide array of inflammasomes and their adapter molecules have been identified in the host’s innate immune system in response to various pathogens. Components of specific pathogens activate different inflammasomes, which once activated in response to pathogen-induced infection, induce the activation of caspases, and the release of mature forms of interleukin-1β (IL-1β) and IL-18. Identifying the mechanisms underlying pathogen-induced inflammasome activation is important if we are to develop novel therapeutic strategies to target sexually transmitted infections (STIs) related pathogens. This information is currently lacking in literature. In this review, we have discussed the role of various inflammasomes in sensing different STIs, as well as the beneficial or detrimental effects of inflammasome signaling in host resistance. Additionally, we have discussed both canonical and non-canonical processing of IL-1β induced with respect to particular infections. Overall, these findings transform our understanding of both the basic biology and clinical relevance of inflammasomes.
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Affiliation(s)
- Vivek Verma
- Dr. B. R. Ambedkar Center for Biomedical Research, University of Delhi , New Delhi , India
| | - Rakesh Singh Dhanda
- Department of Translational and Regenerative Medicine, Post Graduate Institute of Medical Education and Research (PGIMER) , Chandigarh , India
| | | | - Manisha Yadav
- Dr. B. R. Ambedkar Center for Biomedical Research, University of Delhi, New Delhi, India; Department of Clinical Microbiology, Rigshospitalet, Copenhagen, Denmark
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Wu DD, Pan PH, Liu B, Su XL, Zhang LM, Tan HY, Cao Z, Zhou ZR, Li HT, Li HS, Huang L, Li YY. Inhibition of Alveolar Macrophage Pyroptosis Reduces Lipopolysaccharide-induced Acute Lung Injury in Mice. Chin Med J (Engl) 2016; 128:2638-45. [PMID: 26415803 PMCID: PMC4736856 DOI: 10.4103/0366-6999.166039] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Background: Pyroptosis is the term for caspase-1-dependent cell death associated with pro-inflammatory cytokines. The role of alveolar macrophage (AM) pyroptosis in the pathogenesis of the acute lung injury and acute respiratory distress syndrome (ALI/ARDS) remains unclear. Methods: C57BL/6 wild-type mice were assigned to sham, lipopolysaccharide (LPS) + vehicle, LPS + acetyl-tyrosyl-valyl- alanyl-aspartyl-chloromethylketone (Ac-YVAD-CMK) and LPS + Z-Asp-Glu-Val-Asp-fluoromethylketone groups. Mice were given intraperitoneal (IP) injections of LPS. Drugs were IP injected 1 h before LPS administration. Mice were sacrificed 16 h after LPS administration, and AMs were isolated. Western blot analysis for active caspase-1 and cleaved caspase-3, evaluation of lung injury and a cytokine release analysis were performed. AMs were treated with LPS and adenosine triphosphate (ATP); caspase-1-dependent cell death was evaluated using flow cytometry; the apoptosis-associated speck-like protein containing a caspase recruitment domain (ASC) pyroptosomes were examined by immunofluorescence. Results: The expression of activated caspase-1 in AMs was enhanced following LPS challenge compared with the sham group. In the ex vivo study, the caspase-1/propidium iodide-positive cells, caspase-1 specks and ASC pyroptosomes were up-regulated in AMs following LPS/ATP stimulation. The specific caspase-1 inhibitor Ac-YVAD-CMK inhibited the activation of caspase-1 and pyroptotic cell death. Ac-YVAD-CMK also reduced the lung injury, pulmonary edema and total protein in bronchoalveolar lavage fluid (BALF). In addition, Ac-YVAD-CMK significantly inhibited interleukin-β (IL-1β) release both in serum and BALF and reduced the levels of IL-18, tumor necrosis factor-α (TNF-α), High Mobility Group Box 1 (HMGB1) in BALF during LPS-induced ALI/ARDS. Conclusions: This study reported AM pyroptosis during LPS-induced ALI/ARDS in mice and has demonstrated that Ac-YVAD-CMK can prevent AM-induced pyroptosis and lung injury. These preliminary findings may form the basis for further studies to evaluate this pathway as a target for prevention or reduction of ALI/ARDS.
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Affiliation(s)
| | - Pin-Hua Pan
- Department of Pulmonary and Critical Care Medicine, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
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Chen H, Lu Y, Cao Z, Ma Q, Pi H, Fang Y, Yu Z, Hu H, Zhou Z. Cadmium induces NLRP3 inflammasome-dependent pyroptosis in vascular endothelial cells. Toxicol Lett 2016; 246:7-16. [PMID: 26809137 DOI: 10.1016/j.toxlet.2016.01.014] [Citation(s) in RCA: 118] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2015] [Revised: 01/18/2016] [Accepted: 01/19/2016] [Indexed: 12/18/2022]
Abstract
Cadmium (Cd) is an important and common environmental pollutant that has been linked to cardiovascular diseases, such as atherosclerosis and hypertension. Increasing evidence demonstrates that Cd impairs the cardiovascular system by targeting vascular endothelial cells, but the underlying mechanisms remain obscure. In human umbilical vein endothelial cells (HUVECs), we observed that Cd treatment led to cell death and the generation of inflammatory cytokines. The Cd-induced cell death was identified as pyroptosis, a novel pro-inflammatory form of cell death depending on caspase-1 activation. In addition, exposure of HUVECs to Cd resulted in NLRP3 inflammasome activation as evidenced by cleavage of caspase-1 and downstream interleukin (IL)-1β production. Moreover, knockdown of NLRP3 by small interfering RNA efficiently suppressed Cd-induced caspase-1 cleavage, IL-1β production and pyroptosis in HUVECs. Additional experiments demonstrated that treatment with Cd significantly increased the levels of mitochondrial reactive oxygen species (mtROS) and intracellular ROS in HUVECs. Accordingly, pre-treatment with mtROS scavenger or total ROS scavenger reduced Cd-induced activation of NLRP3 inflammasome and pyroptotic cell death. Taken together, our data suggest that NLRP3 inflammasome, activated by the generation of mtROS, mediates Cd-induced pyroptosis in HUVECs. Our results provide novel insights into Cd-induced cytotoxicity and the underlying mechanism by which Cd induces endothelial injury.
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Affiliation(s)
- Haiyan Chen
- Department of Cardiovasology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan, China
| | - Yonghui Lu
- Department of Occupational Health, Third Military Medical University, Chongqing 400038, China
| | - Zhengwang Cao
- Department of Occupational Health, Third Military Medical University, Chongqing 400038, China
| | - Qinlong Ma
- Department of Occupational Health, Third Military Medical University, Chongqing 400038, China
| | - Huifeng Pi
- Department of Occupational Health, Third Military Medical University, Chongqing 400038, China
| | - Yiliang Fang
- Department of Occupational Health, Third Military Medical University, Chongqing 400038, China
| | - Zhengping Yu
- Department of Occupational Health, Third Military Medical University, Chongqing 400038, China
| | - Houxiang Hu
- Department of Cardiovasology, Affiliated Hospital of North Sichuan Medical College, Nanchong 637000, Sichuan, China.
| | - Zhou Zhou
- Department of Occupational Health, Third Military Medical University, Chongqing 400038, China.
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22
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Zhang L, Wang T, Lu Y, Zheng Q, Gao Y, Zhou X, Huang D. Tumor Necrosis Factor Receptor-associated Factor 6 Plays a Role in the Inflammatory Responses of Human Periodontal Ligament Fibroblasts to Enterococcus faecalis. J Endod 2015; 41:1997-2001. [PMID: 26454720 DOI: 10.1016/j.joen.2015.08.028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Revised: 07/22/2015] [Accepted: 08/29/2015] [Indexed: 01/12/2023]
Abstract
INTRODUCTION Enterococcus faecalis is a frequently isolated microorganism in persistent periapical lesion or secondary infection. However, no evidence has demonstrated that E. faecalis induced inflammation directly in the apical area. This study aimed to explore the mechanism of the inflammatory responses of human periodontal ligament fibroblasts (PDLs) to E. faecalis. METHODS PDLs were stimulated with heat-killed E. faecalis (HKEF) or lipoteichoic acid from E. faecalis (LTA) with or without silencing of tumor necrosis factor receptor-associated factor 6 (TRAF6). The expressions of toll-like receptor 2/4, nucleotide-binding oligomerization domain 1/2, and TRAF6 were detected by using quantitative real-time polymerase chain reaction and Western blot. The secretions of proinflammatory cytokines, including interleukin-1β, interleukin-6, interleukin-8, and tumor necrosis factor-α, were determined in the cell supernatants with enzyme-linked immunosorbent assay. RESULTS Both HKEF and LTA stimulated the expression of toll-like receptor 2 and TRAF6 in a time-dependent manner. The secretions of proinflammatory cytokines were also increased. After silencing TRAF6, the upregulations of proinflammatory cytokines induced by HKEF or LTA were attenuated. CONCLUSIONS TRAF6 plays a pivotal role in inflammation induced by E. faecalis or its LTA in PDLs.
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Affiliation(s)
- Lan Zhang
- Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, China; Department of Conservative Dentistry, West China College of Stomatology, Sichuan University, Chengdu, China
| | - Tingting Wang
- Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, China
| | - Yu Lu
- Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, China
| | - Qinghua Zheng
- Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, China
| | - Yuan Gao
- Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, China; Department of Conservative Dentistry, West China College of Stomatology, Sichuan University, Chengdu, China
| | - Xuedong Zhou
- Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, China; Department of Conservative Dentistry, West China College of Stomatology, Sichuan University, Chengdu, China
| | - Dingming Huang
- Key Laboratory of Oral Diseases, West China College of Stomatology, Sichuan University, Chengdu, China; Department of Conservative Dentistry, West China College of Stomatology, Sichuan University, Chengdu, China.
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23
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Schachter J, Delgado KV, Barreto-de-Souza V, Bou-Habib DC, Persechini PM, Meyer-Fernandes JR. Inhibition of ecto-ATPase activities impairs HIV-1 infection of macrophages. Immunobiology 2014; 220:589-96. [PMID: 25577295 DOI: 10.1016/j.imbio.2014.12.004] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 11/29/2014] [Accepted: 12/10/2014] [Indexed: 12/21/2022]
Abstract
Nucleotides and nucleosides are secreted into extracellular media at different concentrations as a consequence of different physiologic and pathological conditions. Ecto-nucleotidases, enzymes present on the surface of most cells, hydrolyze these extracellular nucleotides and reduce the concentration of them, thus affecting the activation of different nucleotide and nucleoside receptors. Also, ecto-nucleotidases are present in a number of microorganisms and play important roles in host-pathogen interactions. Here, we characterized the ecto-ATPase activities present on the surface of HIV-1 particle and human macrophages as well. We found that the kinetic properties of HIV-1 and macrophage ecto-ATPases are similar, suggesting that the enzyme is the same. This ecto-ATPase activity was increased in macrophages infected in vitro with HIV-1. Using three different non-related ecto-ATPase inhibitors-POM-1, ARL67156 and BG0-we showed that the inhibition of these macrophage and viral ecto-ATPase activities impairs HIV-1 infection. In addition, we also found that elevated extracellular concentrations of ATP inhibit HIV-1 production by infected macrophages.
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Affiliation(s)
- Julieta Schachter
- Campus de Xerem, Universidade Federal do Rio de Janeiro - UFRJ, Rio de Janeiro, RJ, Brazil; Instituto Nacional de Ciência e Tecnologia para Pesquisa Translacional em Saúde e Ambiente na Região Amazônica (INPeTAm), Conselho Nacional de Desenvolvimento Científico e Tecnológico, Rio de Janeiro, RJ, Brazil.
| | - Kelly Valcárcel Delgado
- Instituto Nacional de Ciência e Tecnologia para Pesquisa Translacional em Saúde e Ambiente na Região Amazônica (INPeTAm), Conselho Nacional de Desenvolvimento Científico e Tecnológico, Rio de Janeiro, RJ, Brazil; Instituto de Biofísica, Carlos Chagas Filho (IBCCF), Universidade Federal do Rio de Janeiro - UFRJ, Rio de Janeiro, RJ, Brazil
| | - Victor Barreto-de-Souza
- Laboratório de Pesquisa sobre o Timo, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Dumith Chequer Bou-Habib
- Laboratório de Pesquisa sobre o Timo, Instituto Oswaldo Cruz, Fundação Oswaldo Cruz, Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Pedro Muanis Persechini
- Instituto Nacional de Ciência e Tecnologia para Pesquisa Translacional em Saúde e Ambiente na Região Amazônica (INPeTAm), Conselho Nacional de Desenvolvimento Científico e Tecnológico, Rio de Janeiro, RJ, Brazil; Instituto de Biofísica, Carlos Chagas Filho (IBCCF), Universidade Federal do Rio de Janeiro - UFRJ, Rio de Janeiro, RJ, Brazil
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