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Huggard D, Doherty DG, Molloy EJ. Immune Dysregulation in Children With Down Syndrome. Front Pediatr 2020; 8:73. [PMID: 32175298 PMCID: PMC7056667 DOI: 10.3389/fped.2020.00073] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Accepted: 02/14/2020] [Indexed: 12/12/2022] Open
Abstract
Down syndrome (DS) is the most common genetic syndrome associated with immune defects. The extent of immune dysregulation in DS is substantial, spanning the innate and adaptive systems and including anomalies in: T and B cells, monocytes, neutrophil chemotaxis, circulating cytokines, and suboptimal antibody responses which all contribute to an increased risk of infections, poorer clinical outcomes and chronic inflammation in this vulnerable cohort. Other aspects of innate immunity may also be abnormal and contribute to the increased morbidity and warrant further interrogation such as: gamma delta T cell function, the inflammasome, Toll-like receptors and their pathways. Pharmacotherapies such as pavilizumab, pneumococcal and influenza immunizations, as well as potential immunoprophylactic agents such as pidotimod, azithromycin and Broncho-Vaxom may help alleviate the infectious consequences. Children with DS need to be managed with a heightened sense of awareness and urgency in the setting of sepsis and signs of chronic inflammation need regular screening and appropriate follow up.
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Affiliation(s)
- Dean Huggard
- Paediatrics, Trinity College, The University of Dublin, Dublin, Ireland.,Trinity Translational Medicine Institute (TTMI), Trinity College Dublin, Dublin, Ireland.,Paediatrics, Children's Hospital Ireland at Crumlin and Tallaght, Dublin, Ireland.,National Children's Research Centre Dublin, Dublin, Ireland
| | - Derek G Doherty
- Paediatrics, Trinity College, The University of Dublin, Dublin, Ireland.,Trinity Translational Medicine Institute (TTMI), Trinity College Dublin, Dublin, Ireland
| | - Eleanor J Molloy
- Paediatrics, Trinity College, The University of Dublin, Dublin, Ireland.,Trinity Translational Medicine Institute (TTMI), Trinity College Dublin, Dublin, Ireland.,Paediatrics, Children's Hospital Ireland at Crumlin and Tallaght, Dublin, Ireland.,National Children's Research Centre Dublin, Dublin, Ireland.,Coombe Women and Infants University Hospital, Dublin, Ireland
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152
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Wu T, Liang X, Jiang Y, Chen Q, Zhang H, Zhang S, Zhang C, Lv Y, Xin J, Jiang J, Shi D, Chen X, Li J, Xu Y. Comprehensive Transcriptome Profiling of Peripheral Blood Mononuclear Cells from Patients with Sepsis. Int J Med Sci 2020; 17:2077-2086. [PMID: 32922168 PMCID: PMC7484663 DOI: 10.7150/ijms.46910] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Accepted: 07/14/2020] [Indexed: 01/23/2023] Open
Abstract
Background: Sepsis, as a clinical emergency, usually causes multiorgan dysfunction and can lead to high mortality. Establishment of specific and sensitive biomarkers for early diagnosis is critical to identify patients who would benefit from targeted therapy. In this study, we investigated this syndrome by analyzing the transcriptome of peripheral blood mononuclear cells (PBMCs) from patients with sepsis and identified sepsis-specific biomarkers. Methods: In this study, a total of 87 patients with sepsis and 40 healthy controls from a prospective multicenter cohort were enrolled. Samples from 44 subjects (24 patients with sepsis and 20 healthy controls) were sequenced and the remaining patients were included in the validation group. Using high-throughput sequencing, a gene expression profile of PBMCs from patients with sepsis was generated to elucidate the pathophysiology of sepsis and identify sepsis-specific biomarkers. Results: Principal component analysis (PCA) and unsupervised hierarchical cluster analysis showed that patients with sepsis separated from healthy controls. A total of 1639 differentially expressed genes (DEGs) were identified (|log2 fold change|>2, adjusted P value <0.05) between these two groups, with 1278 (78.0%) upregulated and 361 (22.0%) downregulated in patients with sepsis. Gene Ontology (GO) analysis of the upregulated DEGs identified 194 GO terms that were clustered into 27 groups, and analysis of the downregulated DEGs identified 20 GO terms that were clustered into 4 groups. Four unique genes were identified that could be predictive of patients with sepsis. External validation of the four genes using quantitative real-time polymerase chain reaction (qRT-PCR) was consistent with the results of mRNA sequencing, revealing their potential in sepsis diagnosis. Conclusions: The transcriptome characteristics of PBMCs, which were significantly altered in sepsis patients, provide new insights into sepsis pathogenesis. The four identified gene expression changes differentiated patients with sepsis from healthy subjects, which could serve as a convenient tool contributing to sepsis diagnosis.
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Affiliation(s)
- Tianzhou Wu
- Precision Medicine Center, Taizhou Central Hospital, Taizhou University Medical School, Taizhou, China
| | - Xi Liang
- Precision Medicine Center, Taizhou Central Hospital, Taizhou University Medical School, Taizhou, China
| | - Yongpo Jiang
- Department of intensive care unit, Taizhou Hospital of Zhejiang Province, Wenzhou Medical University, Taizhou, China
| | - Qi Chen
- Precision Medicine Center, Taizhou Central Hospital, Taizhou University Medical School, Taizhou, China
| | - Huaping Zhang
- Department of intensive care unit, Taizhou Central Hospital, Taizhou University Medical School, Taizhou, China
| | - Sheng Zhang
- Department of intensive care unit, Taizhou Hospital of Zhejiang Province, Wenzhou Medical University, Taizhou, China
| | - Chao Zhang
- Department of intensive care unit, Taizhou Enze Medical Center (Group) Enze Hospital, Taizhou, China
| | - Yuhang Lv
- Department of intensive care unit, Taizhou Central Hospital, Taizhou University Medical School, Taizhou, China
| | - Jiaojiao Xin
- Precision Medicine Center, Taizhou Central Hospital, Taizhou University Medical School, Taizhou, China.,State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine
| | - Jing Jiang
- Precision Medicine Center, Taizhou Central Hospital, Taizhou University Medical School, Taizhou, China.,State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine
| | - Dongyan Shi
- Precision Medicine Center, Taizhou Central Hospital, Taizhou University Medical School, Taizhou, China.,State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine
| | - Xin Chen
- Precision Medicine Center, Taizhou Central Hospital, Taizhou University Medical School, Taizhou, China.,Institute of Pharmaceutical Biotechnology, Zhejiang University School of Medicine, Hangzhou, China
| | - Jun Li
- Precision Medicine Center, Taizhou Central Hospital, Taizhou University Medical School, Taizhou, China.,State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, Collaborative National Clinical Research Center for Infectious Diseases, The First Affiliated Hospital, Zhejiang University School of Medicine
| | - Yinghe Xu
- Department of intensive care unit, Taizhou Central Hospital, Taizhou University Medical School, Taizhou, China
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153
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Wei ZM, Wang Z, Wan XJ, Li XJ, Li YX, Bai Y, Yang X, Yang Y, Jiao SC, Liu ZF. FcRγ deficiency improves survival in experimental sepsis by down-regulating TLR4 signaling pathway. Immunol Res 2019; 67:77-83. [PMID: 30552619 DOI: 10.1007/s12026-018-9039-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Fc receptor common γ signaling chain (FcRγ), a common subunit shared by Fc receptors (FcγRI, III, IV, FcαRI, and FcεRI), is an important immune regulator both in innate and adaptive immunity. Previous studies have shown that FcRγ was a potential target of inflammatory diseases, whereas the role of FcRγ in sepsis has been poorly understood. In this study, we found that deficiency of FcRγ resulted in increased survival in lipopolysaccharide (LPS)/D-galactosamine and E. coli-induced sepsis in mice. This protective effect was characterized by decreased TNF-α, IL-6, and IL-10. Further experiments in bone marrow-derived macrophages (BMDMs) in vitro also showed that FcRγ deficiency resulted in decreased production of TNF-α, IL-6, and IL-10 upon LPS stimulation. The mechanism study showed that FcRγ was physiologically associated with toll-like receptor 4 (TLR4), and tyrosine phosphorylation of FcRγ mediated TLR4 signaling pathway, followed by increased ERK phosphorylation upon LPS stimulation. Our results suggest that FcRγ might be a potential therapeutic target of sepsis.
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Affiliation(s)
- Zhi-Min Wei
- Department of Oncology, General Hospital of Chinese PLA, 28 Fuxing Road, Beijing, 100853, China
| | - Zhuo Wang
- State Key Laboratory of Natural Medicines, Center for New Drug Safety Evaluation and Research, China Pharmaceutical University, Nanjing, 211198, China.,School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing, 210023, China
| | - Xiao-Jian Wan
- Department of Anesthesiology and Intensive Care Medicine, Changhai Hospital, Second Military Medical University, 800 Xiangyin Rd, Yangpu Qu, Shanghai, China
| | - Xian-Jing Li
- State Key Laboratory of Natural Medicines, Center for New Drug Safety Evaluation and Research, China Pharmaceutical University, Nanjing, 211198, China
| | - Yi-Xing Li
- State Key Laboratory of Natural Medicines, Center for New Drug Safety Evaluation and Research, China Pharmaceutical University, Nanjing, 211198, China
| | - Yang Bai
- State Key Laboratory of Natural Medicines, Center for New Drug Safety Evaluation and Research, China Pharmaceutical University, Nanjing, 211198, China
| | - Xue Yang
- State Key Laboratory of Natural Medicines, Center for New Drug Safety Evaluation and Research, China Pharmaceutical University, Nanjing, 211198, China
| | - Yong Yang
- State Key Laboratory of Natural Medicines, Center for New Drug Safety Evaluation and Research, China Pharmaceutical University, Nanjing, 211198, China.
| | - Shun-Chang Jiao
- Department of Oncology, General Hospital of Chinese PLA, 28 Fuxing Road, Beijing, 100853, China.
| | - Zhe-Feng Liu
- Department of Oncology, General Hospital of Chinese PLA, 28 Fuxing Road, Beijing, 100853, China.
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154
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Salmonella enterica Serovar Typhimurium Uses PbgA/YejM To Regulate Lipopolysaccharide Assembly during Bacteremia. Infect Immun 2019; 88:IAI.00758-19. [PMID: 31611279 PMCID: PMC6921655 DOI: 10.1128/iai.00758-19] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Accepted: 10/01/2019] [Indexed: 12/14/2022] Open
Abstract
Salmonella enterica serovar Typhimurium (S Typhimurium) relies upon the inner membrane protein PbgA to enhance outer membrane (OM) integrity and promote virulence in mice. The PbgA transmembrane domain (residues 1 to 190) is essential for viability, while the periplasmic domain (residues 191 to 586) is dispensable. Residues within the basic region (residues 191 to 245) bind acidic phosphates on polar phospholipids, like for cardiolipins, and are necessary for salmonella OM integrity. S Typhimurium bacteria increase their OM cardiolipin concentrations during activation of the PhoPQ regulators. The mechanism involves PbgA's periplasmic globular region (residues 245 to 586), but the biological role of increasing cardiolipins on the surface is not understood. Nonsynonymous polymorphisms in three essential lipopolysaccharide (LPS) synthesis regulators, lapB (also known as yciM), ftsH, and lpxC, variably suppressed the defects in OM integrity, rifampin resistance, survival in macrophages, and systemic colonization of mice in the pbgAΔ191-586 mutant (in which the PbgA periplasmic domain from residues 191 to 586 is deleted). Compared to the OMs of the wild-type salmonellae, the OMs of the pbgA mutants had increased levels of lipid A-core molecules, cardiolipins, and phosphatidylethanolamines and decreased levels of specific phospholipids with cyclopropanated fatty acids. Complementation and substitution mutations in LapB and LpxC generally restored the phospholipid and LPS assembly defects for the pbgA mutants. During bacteremia, mice infected with the pbgA mutants survived and cleared the bacteria, while animals infected with wild-type salmonellae succumbed within 1 week. Remarkably, wild-type mice survived asymptomatically with pbgA-lpxC salmonellae in their livers and spleens for months, but Toll-like receptor 4-deficient animals succumbed to these infections within roughly 1 week. In summary, S Typhimurium uses PbgA to influence LPS assembly during stress in order to survive, adapt, and proliferate within the host environment.
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155
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Hesperetin ameliorates lipopolysaccharide-induced acute lung injury in mice through regulating the TLR4-MyD88-NF-κB signaling pathway. Arch Pharm Res 2019; 42:1063-1070. [PMID: 31802426 DOI: 10.1007/s12272-019-01200-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Accepted: 12/02/2019] [Indexed: 12/17/2022]
Abstract
Hesperetin, a major bioflavonoid in sweet oranges and lemons, exerts an anti-inflammatory effect in pulmonary diseases; however, its effect on lipopolysaccharide (LPS)-induced acute lung injury is unclear. This study investigated the effect of hesperetin on LPS-induced lung inflammatory response. Mice were intratracheally instilled with 5 mg/kg body weight LPS, and then were given hesperetin orally (10, 20, and 30 mg/kg body weight) 1 h later. Hesperetin dramatically suppressed the levels of interleukin-6 and tumor necrosis factor-α, as well as the number of inflammatory cells in bronchoalveolar lavage fluid. Besides, it reduced lung injury, wet weight/dry weight ratio, and myeloperoxidase and lactate dehydrogenase activities, and enhanced superoxide dismutase activity. In addition, hesperetin significantly downregulated the Toll-like receptor 4 (TLR4) and myeloid differentiation factor 88 (MyD88) protein expression and suppressed nuclear factor-kappa B (NF-κB) activation in lung tissue. Together, these results indicated that the anti-inflammatory effect of hesperetin is associated with the TLR4-MyD88-NF-κB pathway, and that hesperetin shows therapeutic potential for LPS-induced acute lung injury.
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156
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Feng D, Zou J, Su D, Mai H, Zhang S, Li P, Zheng X. Curcumin prevents high-fat diet-induced hepatic steatosis in ApoE -/- mice by improving intestinal barrier function and reducing endotoxin and liver TLR4/NF-κB inflammation. Nutr Metab (Lond) 2019; 16:79. [PMID: 31788011 PMCID: PMC6858759 DOI: 10.1186/s12986-019-0410-3] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 11/06/2019] [Indexed: 02/06/2023] Open
Abstract
Background Non-alcoholic fatty liver disease (NAFLD) is the most common chronic liver disease and has become a public health concern worldwide. The hallmark of NAFLD is hepatic steatosis. Therefore, there is an urgent need to develop new therapeutic strategies that are efficacious and have minimal side effects in hepatic steatosis and NAFLD treatment. The present study aimed to investigate the effect of dietary supplement of curcumin on high-fat diet (HFD)-induced hepatic steatosis and the underlying mechanism. Methods ApoE−/− mice were fed a normal diet, high-fat diet (HFD) or HFD supplemented with curcumin (0.1% w/w) for 16 weeks. Body and liver weight, blood biochemical. parameters, and liver lipids were measured. Intestinal permeability, hepatic steatosis and mRNA and protein expressions of TLR4-related inflammatory signaling molecule were analyzed. Results The administration of curcumin significantly prevented HFD-induced body weight gain and reduced liver weight. Curcumin attenuated hepatic steatosis along with improved serum lipid profile. Moreover, curcumin up-regulated the expression of intestinal tight junction protein zonula occluden-1 and occludin, which further improved gut barrier dysfunction and reduced circulating lipopolysaccharide levels. Curcumin also markedly down-regulated the protein expression of hepatic TLR4 and myeloid differentiation factor 88 (MyD88), inhibited p65 nuclear translocation and DNA binding activity of nuclear factor-κB (NF-κB) in the liver. In addition, the mRNA expression of hepatic tumour necrosis factor-α (TNF-α) and interleukin-1β (IL-1β) as well as the plasma levels of TNF-α and IL-1β were also lowered by curcumin treatment. Conclusion These results indicated that curcumin protects against HFD-induced hepatic steatosis by improving intestinal barrier function and reducing endotoxin and liver TLR4/NF-κB inflammation. The ability of curcumin to inhibit hepatic steatosis portrayed its potential as effective dietry intervention for NAFLD prevention.
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Affiliation(s)
- Dan Feng
- 1Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Preventive Medicine, School of Public Health, Sun Yat-sen University(Northern Campus), 74 Zhongshan Road 2, Guangzhou, 510080 Guangdong Province China
| | - Jun Zou
- 2Department of Cardiology, Affiliated Nanhai Hospital of Southern Medical University, Foshan, 528200 China
| | - Dongfang Su
- 3Department of Clinic Nutrition, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Sun Yat-sen University Cancer Center, Guangzhou, 510060 China
| | - Haiyan Mai
- 4Department of Clinic Nutrition, The First Affiliated Hospital, Sun Yat-sen University, Guangzhou, 510080 China
| | - Shanshan Zhang
- 1Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Preventive Medicine, School of Public Health, Sun Yat-sen University(Northern Campus), 74 Zhongshan Road 2, Guangzhou, 510080 Guangdong Province China
| | - Peiyang Li
- 1Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Preventive Medicine, School of Public Health, Sun Yat-sen University(Northern Campus), 74 Zhongshan Road 2, Guangzhou, 510080 Guangdong Province China
| | - Xiumei Zheng
- 1Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Preventive Medicine, School of Public Health, Sun Yat-sen University(Northern Campus), 74 Zhongshan Road 2, Guangzhou, 510080 Guangdong Province China
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157
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Zhang M, Zhao M, Qing Y, Luo Y, Xia G, Li Y. Study on immunostimulatory activity and extraction process optimization of polysaccharides from Caulerpa lentillifera. Int J Biol Macromol 2019; 143:677-684. [PMID: 31730975 DOI: 10.1016/j.ijbiomac.2019.10.042] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 09/27/2019] [Accepted: 10/03/2019] [Indexed: 12/24/2022]
Abstract
The process of extracting polysaccharides from the green algae Caulerpa lentillifera was studied by single factor experiments and response surface methodology. Additionally, the immunostimulatory activity of Caulerpa lentillifera polysaccharides (CLP) on RAW264.7 mouse macrophage was evaluated by in vitro cell experiments. The results showed that the optimal extraction conditions consisted of ultrasonification for 30 min, extraction time of 9 h, extraction temperature of 100 °C, and a ratio of water to raw material of 40:1. RAW264.7 macrophage exhibited enhanced phagocytosis with no toxic effects after treatment with CLP. In addition, CLP effectively increased the synthesis and secretion of cytokines (IL-6, TNF-α, IL-1β, and NO), whereby the secretion levels of IL-6, TNF-α, and IL-1β were 1,840.32 ± 21.03 pg/mL (50 μg/mL), 197.17 ± 3.13 ng/mL (50 μg/mL), and 1,178.35 ± 78.82 pg/mL (25 μg/mL), respectively. The polysaccharides contained in Caulerpa lentillifera have potential value for further development due to their immunological activity.
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Affiliation(s)
- Meijian Zhang
- Hainan Engineering Research Center of Aquatic Resources Efficient Utilization in South China Sea, Hainan University, Hainan 570228, China; College of Food Science and Technology, Hainan University, Hainan 570228, China
| | - Meihui Zhao
- Hainan Engineering Research Center of Aquatic Resources Efficient Utilization in South China Sea, Hainan University, Hainan 570228, China
| | - Yudie Qing
- College of Food Science and Technology, Hainan University, Hainan 570228, China
| | - Yuanyuan Luo
- College of Food Science and Technology, Hainan University, Hainan 570228, China
| | - Guanghua Xia
- Hainan Engineering Research Center of Aquatic Resources Efficient Utilization in South China Sea, Hainan University, Hainan 570228, China; Engineering Research Center of Utilization of Tropical Polysaccharide Resources, Ministry of Education, Hainan University, Hainan 570228, China; College of Food Science and Technology, Hainan University, Hainan 570228, China.
| | - Yongcheng Li
- Hainan Engineering Research Center of Aquatic Resources Efficient Utilization in South China Sea, Hainan University, Hainan 570228, China; College of Food Science and Technology, Hainan University, Hainan 570228, China.
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158
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van de Wouw M, Boehme M, Dinan TG, Cryan JF. Monocyte mobilisation, microbiota & mental illness. Brain Behav Immun 2019; 81:74-91. [PMID: 31330299 DOI: 10.1016/j.bbi.2019.07.019] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 07/12/2019] [Accepted: 07/18/2019] [Indexed: 12/13/2022] Open
Abstract
The gastrointestinal microbiome has emerged as a key player in regulating brain and behaviour. This has led to the strategy of targeting the gut microbiota to ameliorate disorders of the central nervous system. Understanding the underlying signalling pathways in which the microbiota impacts these disorders is crucial for the development of future therapeutics for improving CNS functionality. One of the major pathways through which the microbiota influences the brain is the immune system, where there is an increasing appreciation for the role of monocyte trafficking in regulating brain homeostasis. In this review, we will shed light on the role of monocyte trafficking as a relay of microbiota signals in conditions where the central nervous system is in disorder, such as stress, peripheral inflammation, ageing, traumatic brain injury, stroke, multiple sclerosis, Alzheimer's disease and Parkinson's disease. We also cover how the gastrointestinal microbiota is implicated in these mental illnesses. In addition, we aim to discuss how the monocyte system can be modulated by the gut microbiota to mitigate disorders of the central nervous system, which will lead to novel microbiota-targeted strategies.
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Affiliation(s)
| | - Marcus Boehme
- APC Microbiome Ireland, University College Cork, Cork, Ireland; Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland
| | - Timothy G Dinan
- APC Microbiome Ireland, University College Cork, Cork, Ireland; Department of Psychiatry and Neurobehavioral Science, University College Cork, Cork, Ireland
| | - John F Cryan
- APC Microbiome Ireland, University College Cork, Cork, Ireland; Department of Anatomy and Neuroscience, University College Cork, Cork, Ireland.
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159
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Benaoudia S, Martin A, Puig Gamez M, Gay G, Lagrange B, Cornut M, Krasnykov K, Claude J, Bourgeois CF, Hughes S, Gillet B, Allatif O, Corbin A, Ricci R, Henry T. A genome-wide screen identifies IRF2 as a key regulator of caspase-4 in human cells. EMBO Rep 2019; 20:e48235. [PMID: 31353801 PMCID: PMC6727027 DOI: 10.15252/embr.201948235] [Citation(s) in RCA: 52] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 07/01/2019] [Accepted: 07/10/2019] [Indexed: 12/12/2022] Open
Abstract
Caspase-4, the cytosolic LPS sensor, and gasdermin D, its downstream effector, constitute the non-canonical inflammasome, which drives inflammatory responses during Gram-negative bacterial infections. It remains unclear whether other proteins regulate cytosolic LPS sensing, particularly in human cells. Here, we conduct a genome-wide CRISPR/Cas9 screen in a human monocyte cell line to identify genes controlling cytosolic LPS-mediated pyroptosis. We find that the transcription factor, IRF2, is required for pyroptosis following cytosolic LPS delivery and functions by directly regulating caspase-4 levels in human monocytes and iPSC-derived monocytes. CASP4, GSDMD, and IRF2 are the only genes identified with high significance in this screen highlighting the simplicity of the non-canonical inflammasome. Upon IFN-γ priming, IRF1 induction compensates IRF2 deficiency, leading to robust caspase-4 expression. Deficiency in IRF2 results in dampened inflammasome responses upon infection with Gram-negative bacteria. This study emphasizes the central role of IRF family members as specific regulators of the non-canonical inflammasome.
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Affiliation(s)
- Sacha Benaoudia
- CIRI, Centre International de Recherche en InfectiologieInserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de LyonUniv LyonLyonFrance
| | - Amandine Martin
- CIRI, Centre International de Recherche en InfectiologieInserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de LyonUniv LyonLyonFrance
| | - Marta Puig Gamez
- Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC)Centre National de la Recherche Scientifique, UMR 7104Institut National de la Santé et de la Recherche Médicale U964Université de StrasbourgIllkirchFrance
- Laboratoire de Biochimie et de Biologie MoléculaireNouvel Hôpital CivilStrasbourgFrance
- Université de StrasbourgStrasbourgFrance
- INGESTEM National iPSC InfrastructureVillejuifFrance
| | - Gabrielle Gay
- CIRI, Centre International de Recherche en InfectiologieInserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de LyonUniv LyonLyonFrance
| | - Brice Lagrange
- CIRI, Centre International de Recherche en InfectiologieInserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de LyonUniv LyonLyonFrance
| | - Maxence Cornut
- CIRI, Centre International de Recherche en InfectiologieInserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de LyonUniv LyonLyonFrance
| | - Kyrylo Krasnykov
- CIRI, Centre International de Recherche en InfectiologieInserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de LyonUniv LyonLyonFrance
| | - Jean‐Baptiste Claude
- LBMC, Laboratoire de Biologie et Modélisation de la celluleUniversité Claude Bernard Lyon 1INSERM U1210, CNRS, UMR5239École Normale Supérieure de LyonUniv LyonLyonFrance
| | - Cyril F Bourgeois
- LBMC, Laboratoire de Biologie et Modélisation de la celluleUniversité Claude Bernard Lyon 1INSERM U1210, CNRS, UMR5239École Normale Supérieure de LyonUniv LyonLyonFrance
| | - Sandrine Hughes
- Sequencing PlatformInstitut de Génomique Fonctionnelle de Lyon (IGFL)Université Claude Bernard Lyon 1, CNRS, UMR5242École Normale Supérieure de LyonUniv LyonLyonFrance
| | - Benjamin Gillet
- Sequencing PlatformInstitut de Génomique Fonctionnelle de Lyon (IGFL)Université Claude Bernard Lyon 1, CNRS, UMR5242École Normale Supérieure de LyonUniv LyonLyonFrance
| | - Omran Allatif
- CIRI, Centre International de Recherche en InfectiologieInserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de LyonUniv LyonLyonFrance
- BIBS, Bioinformatic and Biostatic ServicesCIRILyonFrance
| | - Antoine Corbin
- CIRI, Centre International de Recherche en InfectiologieInserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de LyonUniv LyonLyonFrance
- BIBS, Bioinformatic and Biostatic ServicesCIRILyonFrance
| | - Romeo Ricci
- Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC)Centre National de la Recherche Scientifique, UMR 7104Institut National de la Santé et de la Recherche Médicale U964Université de StrasbourgIllkirchFrance
- Laboratoire de Biochimie et de Biologie MoléculaireNouvel Hôpital CivilStrasbourgFrance
- Université de StrasbourgStrasbourgFrance
- INGESTEM National iPSC InfrastructureVillejuifFrance
| | - Thomas Henry
- CIRI, Centre International de Recherche en InfectiologieInserm, U1111, Université Claude Bernard Lyon 1, CNRS, UMR5308, ENS de LyonUniv LyonLyonFrance
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160
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Yue X, Guidry JJ. Differential Protein Expression Profiles of Bronchoalveolar Lavage Fluid Following Lipopolysaccharide-Induced Direct and Indirect Lung Injury in Mice. Int J Mol Sci 2019; 20:ijms20143401. [PMID: 31373289 PMCID: PMC6679226 DOI: 10.3390/ijms20143401] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 07/01/2019] [Accepted: 07/10/2019] [Indexed: 12/29/2022] Open
Abstract
The pathogenic mechanisms of acute lung injury due to direct and indirect pulmonary insults are incompletely understood. Using an unbiased, discovery and quantitative proteomic approach, we examined bronchoalveolar lavage fluid (BALF) proteome following lipopolysaccharide (LPS)-induced direct and indirect lung injury in mice. A total of 1017 proteins were both identified and quantitated in BALF from control, intratracheal (I.T., direct) and intraperitoneal (I.P., indirect) LPS-treated mice. The two LPS groups shared 13 up-regulated and 22 down-regulated proteins compared to the control group. Ingenuity pathway analysis revealed that acute-phase response signaling was activated by both I.T. and I.P. LPS; however, the magnitude of activation was much greater in the I.T. LPS group. Intriguingly, two canonical signaling pathways, liver X receptor/retinoid X receptor activation, and the production of nitric oxide and reactive oxygen species in macrophages, were activated by I.T. but suppressed by I.P. LPS. Cxcl15 (also known as lungkine) was also up-regulated by I.T. but down-regulated by I.P. LPS. In conclusion, our quantitative discovery-based proteomic approach identified commonalities, as well as significant differences in BALF protein expression profiles between LPS-induced direct and indirect lung injury, and importantly, LPS-induced indirect lung injury resulted in suppression of select components of lung innate immunity.
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Affiliation(s)
- Xinping Yue
- Department of Physiology, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA.
| | - Jessie J Guidry
- Department of Biochemistry and The Proteomic Core Facility, Louisiana State University Health Sciences Center, New Orleans, LA 70112, USA
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161
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Kubelkova K, Macela A. Innate Immune Recognition: An Issue More Complex Than Expected. Front Cell Infect Microbiol 2019; 9:241. [PMID: 31334134 PMCID: PMC6616152 DOI: 10.3389/fcimb.2019.00241] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 06/18/2019] [Indexed: 12/11/2022] Open
Abstract
Primary interaction of an intracellular bacterium with its host cell is initiated by activation of multiple signaling pathways in response to bacterium recognition itself or as cellular responses to stress induced by the bacterium. The leading molecules in these processes are cell surface membrane receptors as well as cytosolic pattern recognition receptors recognizing pathogen-associated molecular patterns or damage-associated molecular patterns induced by the invading bacterium. In this review, we demonstrate possible sequences of events leading to recognition of Francisella tularensis, present findings on known mechanisms for manipulating cell responses to protect Francisella from being killed, and discuss newly published data from the perspective of early stages of host-pathogen interaction.
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Affiliation(s)
- Klara Kubelkova
- Department of Molecular Pathology and Biology, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Czechia
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162
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Johnson DM, Andrew DJ. Role of tbc1 in Drosophila embryonic salivary glands. BMC Mol Cell Biol 2019; 20:19. [PMID: 31242864 PMCID: PMC6595604 DOI: 10.1186/s12860-019-0198-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Accepted: 05/17/2019] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND CG4552/tbc1 was identified as a downstream target of Fork head (Fkh), the single Drosophila member of the FoxA family of transcription factors and a major player in salivary gland formation and homeostasis. Tbc1 and its orthologues have been implicated in phagocytosis, the innate immune response, border cell migration, cancer and an autosomal recessive form of non-degenerative Pontocerebellar hypoplasia. Recently, the mammalian Tbc1 orthologue, Tbc1d23, has been shown to bind both the conserved N-terminal domains of two Golgins (Golgin-97 and Golgin-245) and the WASH complex on endosome vesicles. Through this activity, Tbc1d23 has been proposed to link endosomally-derived vesicles to their appropriate target membrane in the trans Golgi (TGN). RESULTS In this paper, we provide an initial characterization of Drosophila orthologue, we call tbc1. We show that, like its mammalian orthologue, Tbc1 localizes to the trans Golgi. We show that it also colocalizes with a subset of Rabs associated with both early and recycling endosomes. Animals completely missing tbc1 survive, but females have fertility defects. Consistent with the human disease, loss of tbc1 reduces optic lobe size and increases response time to mechanical perturbation. Loss and overexpression of tbc1 in the embryonic salivary glands leads to secretion defects and apical membrane irregularities. CONCLUSIONS These findings support a role for tbc1 in endocytic/membrane trafficking, consistent with its activities in other systems.
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Affiliation(s)
- Dorothy M Johnson
- The Department of Cell Biology, The Johns Hopkins University School of Medicine, 725 N. Wolfe St, Baltimore, MD, 21205, USA
| | - Deborah J Andrew
- The Department of Cell Biology, The Johns Hopkins University School of Medicine, 725 N. Wolfe St, Baltimore, MD, 21205, USA.
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163
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An endosomal LAPF is required for macrophage endocytosis and elimination of bacteria. Proc Natl Acad Sci U S A 2019; 116:12958-12963. [PMID: 31189603 DOI: 10.1073/pnas.1903896116] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Macrophages can internalize the invading pathogens by raft/caveolae and/or clathrin-dependent endocytosis and elicit an immune response against infection. However, the molecular mechanism for macrophage endocytosis remains elusive. Here we report that LAPF (lysosome-associated and apoptosis-inducing protein containing PH and FYVE domains) is required for caveolae-mediated endocytosis. Lapf -deficient macrophages have impaired capacity to endocytose and eliminate bacteria. Macrophage-specific Lapf-deficient mice are more susceptible to Escherichia coli (E. coli) infection with higher bacterial loads. Moreover, Lapf deficiency impairs TLR4 endocytosis, resulting in attenuated production of TLR-triggered proinflammatory cytokines. LAPF is localized to early endosomes and interacts with caveolin-1. Phosphorylation of LAPF by the tyrosine kinase Src is required for LAPF-Src-Caveolin complex formation and endocytosis and elimination of bacteria. Collectively, our work demonstrates that LAPF is critical for endocytosis of bacteria and induction of inflammatory responses, suggesting that LAPF and Src could be potential targets for the control of infectious diseases.
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164
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Cevey ÁC, Penas FN, Alba Soto CD, Mirkin GA, Goren NB. IL-10/STAT3/SOCS3 Axis Is Involved in the Anti-inflammatory Effect of Benznidazole. Front Immunol 2019; 10:1267. [PMID: 31214200 PMCID: PMC6558013 DOI: 10.3389/fimmu.2019.01267] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 05/17/2019] [Indexed: 12/11/2022] Open
Abstract
Anti-parasitic treatment for Chagas disease mainly relies on benznidazole, which is virtually the only drug available in the market. Besides its anti-parasitic effects, benznidazole has anti-inflammatory properties. In this work we studied the mechanisms involved in the latter, demonstrating the participation of the IL-10/STAT3/SOCS3 pathway. To achieve this goal, the anti-inflammatory properties of benznidazole were studied using an in vitro model of cardiomyocyte primary culture stimulated with LPS. LPS increased both SOCS3 expression and STAT3 phosphorylation. The addition of benznidazole increased their expression even further. Specific inhibition of STAT3 precluded this effect, suggesting a role for STAT3 in the increase of SOCS3 expression induced by benznidazole. To assess the participation of SOCS3 in the anti-inflammatory effect of benznidazole, we accomplished specific knockdown of SOCS3 with siRNA. Silencing of SOCS3 in cardiomyocytes precluded the inhibitory effects of benznidazole on TNF-α, IL-6, iNOS expression and NO release. Moreover, in the absence of SOCS3, benznidazole could neither prevent IKK phosphorylation nor IκBα degradation, supporting the notion that SOCS3 is required for the benznidazole-mediated inhibition of the NF-κB pathway. Previously, we demonstrated that IL-10 increases the expression of SOCS3 in cultured cardiomyocytes. Here, we found that benznidazole shows a trend to increased IL-10 expression. To evaluate whether benznidazole increased SOCS3 in an IL-10-dependent manner, cardiomyocytes from IL-10 knockout mice were pre-treated with benznidazole and stimulated with LPS. Benznidazole neither inhibited NO release nor avoid IKK phosphorylation or IκBα degradation, showing that IL-10 is required for benznidazole-mediated inhibition of NF-κB. Moreover, exogenous addition of IL-10 to IL-10 knockout cardiomyocytes restored the inhibitory effect of benznidazole on NO release. The results reported herein show, for the first time, that the IL-10/STAT3/SOCS3 axis is involved in the anti-inflammatory effects of benznidazole. These findings may add up to new therapeutic strategies for chronic Chagas disease given its inflammatory nature.
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Affiliation(s)
- Ágata C Cevey
- Facultad de Medicina, Instituto de Investigaciones Biomédicas en Retrovirus y SIDA (INBIRS), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Federico N Penas
- Facultad de Medicina, Instituto de Investigaciones Biomédicas en Retrovirus y SIDA (INBIRS), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Catalina D Alba Soto
- Facultad de Medicina, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Gerardo A Mirkin
- Facultad de Medicina, Instituto de Investigaciones en Microbiología y Parasitología Médica (IMPaM), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Nora B Goren
- Facultad de Medicina, Instituto de Investigaciones Biomédicas en Retrovirus y SIDA (INBIRS), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
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165
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Zou W, Yin P, Shi Y, Jin N, Gao Q, Li J, Liu F. A Novel Biological Role of α-Mangostin via TAK1-NF-κB Pathway against Inflammatory. Inflammation 2019; 42:103-112. [PMID: 30132203 DOI: 10.1007/s10753-018-0876-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The oxysterone α-mangostin is isolated from mangosteen husks and is widely used in the treatment of abdominal pain, diarrhea, and dysentery. In this study, we established a lipopolysaccharide (LPS)-induced inflammatory model of rat intestinal epithelial cells (IEC-6 cells), at the same time we used differently concentration α-mangostin to detect its anti-inflammatory activity. We applied doses of α-mangostin (2.5, 5, and 10 μM) and detected apoptosis by flow cytometry, and the Griess reagent and the enzyme-linked immunosorbent assay (ELISA) method detected inflammatory factors such as nitric oxide (NO), prostaglandin (PG) E2, interleukin (IL)-1β, IL-6, and tumor necrosis factor (TNF)-α. We also used quantitative real-time PCR (Q-PCR) to examine inflammatory factors and western blotting to examine the activation of transforming growth factor-activated kinase (TAK)-1-nuclear factor (NF)-κB signaling pathway-related proteins. Finally, we used laser confocal microscopy to detect the effect of the 10 μM α-mangostin on the nuclear import of NF-κB-p65. The results showed that α-mangostin treatment significantly reduced the apoptosis of LPS-stimulated IEC-6 cells, the production of inflammatory factors, the activation of TAK1-NF-κB signaling pathway-related proteins, and the entry of p65 into the nucleus. In conclusion, α-mangostin exerts its anti-inflammatory effects by inhibiting the activation of TAK1-NF-κB and it may be a potential choice for the treatment of inflammation diseases.
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Affiliation(s)
- Wenshu Zou
- College of Animal Science and Technology, Beijing University of Agriculture (BUA), Beijing, People's Republic of China
| | - Peng Yin
- Institute of Microbiology Chinese Academy of Sciences, NO.1 Beichen West Road, Beijing, People's Republic of China
| | - Yaran Shi
- College of Animal Science and Technology, Beijing University of Agriculture (BUA), Beijing, People's Republic of China
| | - Na Jin
- College of Animal Science and Technology, Beijing University of Agriculture (BUA), Beijing, People's Republic of China
| | - Qian Gao
- College of Animal Science and Technology, Beijing University of Agriculture (BUA), Beijing, People's Republic of China
| | - Jiandong Li
- College of Animal Science and Technology, Beijing University of Agriculture (BUA), Beijing, People's Republic of China
| | - Fenghua Liu
- College of Animal Science and Technology, Beijing University of Agriculture (BUA), Beijing, People's Republic of China.
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166
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Wang TC, Cochet F, Facchini FA, Zaffaroni L, Serba C, Pascal S, Andraud C, Sala A, Di Lorenzo F, Maury O, Huser T, Peri F. Synthesis of the New Cyanine-Labeled Bacterial Lipooligosaccharides for Intracellular Imaging and in Vitro Microscopy Studies. Bioconjug Chem 2019; 30:1649-1657. [DOI: 10.1021/acs.bioconjchem.9b00044] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Tung-Cheng Wang
- Biomolecular Photonics, Department of Physics, University of Bielefeld. Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Florent Cochet
- Department of Biotechnology and Biosciences, University of Milano-Bicocca. Piazza della Scienza, 2, 20126 Milano, Italy
| | - Fabio Alessandro Facchini
- Department of Biotechnology and Biosciences, University of Milano-Bicocca. Piazza della Scienza, 2, 20126 Milano, Italy
| | - Lenny Zaffaroni
- Department of Biotechnology and Biosciences, University of Milano-Bicocca. Piazza della Scienza, 2, 20126 Milano, Italy
| | - Christelle Serba
- Laboratoire de Chimie, ENS de Lyon, 46 Allée d’Italie, 69364 Lyon Cedex 07, France
| | - Simon Pascal
- Laboratoire de Chimie, ENS de Lyon, 46 Allée d’Italie, 69364 Lyon Cedex 07, France
| | - Chantal Andraud
- Laboratoire de Chimie, ENS de Lyon, 46 Allée d’Italie, 69364 Lyon Cedex 07, France
| | - Andrea Sala
- Laboratoire de Chimie, ENS de Lyon, 46 Allée d’Italie, 69364 Lyon Cedex 07, France
| | - Flaviana Di Lorenzo
- Department of Chemical Sciences, University of Naples, 80126, Naples, Italy
- Task Force on Microbiome Studies, University of Naples Federico II, 80126 Naples, Italy
| | - Olivier Maury
- Laboratoire de Chimie, ENS de Lyon, 46 Allée d’Italie, 69364 Lyon Cedex 07, France
| | - Thomas Huser
- Biomolecular Photonics, Department of Physics, University of Bielefeld. Universitätsstraße 25, 33615 Bielefeld, Germany
| | - Francesco Peri
- Department of Biotechnology and Biosciences, University of Milano-Bicocca. Piazza della Scienza, 2, 20126 Milano, Italy
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167
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Yousefi M, Mamipour M, Sokullu SE, Ghaderi S, Amini H, Rahbarghazi R. Toll-like receptors in the functional orientation of cardiac progenitor cells. J Cell Physiol 2019; 234:19451-19463. [PMID: 31025370 DOI: 10.1002/jcp.28738] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 04/04/2019] [Accepted: 04/11/2019] [Indexed: 12/17/2022]
Abstract
Cardiac progenitor cells (CPCs) have the potential to differentiate into several cell lineages with the ability to restore in cardiac tissue. Multipotency and self-renewal activity are the crucial characteristics of CPCs. Also, CPCs have promising therapeutic roles in cardiac diseases such as valvular disease, thrombosis, atherosclerosis, congestive heart failure, and cardiac remodeling. Toll-like receptors (TLRs), as the main part of the innate immunity, have a key role in the development and differentiation of immune cells. Some reports are found regarding the effect of TLRs in the maturation of stem cells. This article tried to find the potential role of TLRs in the dynamics of CPCs. By showing possible crosstalk between the TLR signaling pathways and CPCs dynamics, we could achieve a better conception related to TLRs in the regeneration of cardiac tissue.
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Affiliation(s)
- Mohammadreza Yousefi
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Research Center for Translational Medicine, Koç University, Istanbul, Turkey
| | - Mina Mamipour
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Research Center for Translational Medicine, Koç University, Istanbul, Turkey
| | - Sadiye E Sokullu
- Engineering Sciences, Bioengineering Department, Faculty of Engineering and Architecture, Izmir Katip Celebi University, Izmir, Turkey
| | - Shahrooz Ghaderi
- Department of System Physiology, Ruhr University, Bochum, Germany
| | - Hassan Amini
- Stem Cell Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of General and Vascular Surgery, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Reza Rahbarghazi
- Tuberculosis and Lung Disease Research Center, Tabriz University of Medical Sciences, Tabriz, Iran.,Department of Applied Cell Sciences, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
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168
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Chlamydia trachomatis Lipopolysaccharide Evades the Canonical and Noncanonical Inflammatory Pathways To Subvert Innate Immunity. mBio 2019; 10:mBio.00595-19. [PMID: 31015326 PMCID: PMC6479002 DOI: 10.1128/mbio.00595-19] [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] [Indexed: 12/14/2022] Open
Abstract
Chlamydia trachomatis is the most common bacterial cause of sexually transmitted infections (STI). C. trachomatis STI are commonly asymptomatic, implying a pathogenic strategy for the evasion of innate inflammatory immune responses, a paradox as the C. trachomatis outer membrane contains lipopolysaccharide (LPS), a known potent agonist of inflammatory innate immunity. Here, we found that C. trachomatis LPS is not capable of engaging the canonical TLR4/MD-2 or noncanonical caspase-11 inflammatory pathways. The inability of C. trachomatis LPS to trigger innate immunity inflammatory pathways is related to its unique fatty acid structure. Evolutionary modification of the LPS structure likely evolved as a pathogenic strategy to silence innate host defense mechanisms. The findings might explain the high incidence of asymptomatic chlamydial genital infection. Chlamydia trachomatis is the most common bacterial cause of sexually transmitted infections. C. trachomatis sexually transmitted infections are commonly asymptomatic, implying a pathogenic strategy for the evasion of innate inflammatory immune responses, a paradox as the C. trachomatis outer membrane contains lipopolysaccharide (LPS), a known potent agonist of inflammatory innate immunity. Here, we studied the ability of chlamydial LPS to activate the proinflammatory canonical and noncanonical inflammasome pathways in mouse bone marrow-derived macrophages (BMDM). We show, in comparison to Escherichia coli LPS, that C. trachomatis LPS-treated BMDM produce significantly less IL-6, TNF, and type I interferon mRNA, indicating that downstream signaling through the canonical TLR4 myddosome and triffosome pathways was blocked. We confirmed this in C. trachomatis LPS-treated BMDM by showing the lack of NF-κB and IRF3 phosphorylation, respectively. Interestingly, C. trachomatis LPS bound CD14 and promoted its endocytosis; however; it did not promote efficient TLR4/MD-2 dimerization or endocytosis, known requirements for myddosome and triffosome signaling pathways. We further found that transfection of BMDM with C. trachomatis LPS did not cause pyroptotic cell ballooning, cytotoxicity, or IL-1β secretion, all characteristic features of noncanonical inflammasome activation. Western blotting confirmed that cytosolic C. trachomatis LPS failed to signal through caspase-11, as shown by the lack of gasdermin D, caspase-1, or IL-1β proteolytic cleavage. We propose that chlamydiae evolved a unique LPS structure as a pathogenic strategy to avoid canonical and noncanonical innate immune signaling and conclude that this strategy might explain the high incidence of asymptomatic infections.
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169
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SN-38, the active metabolite of irinotecan, inhibits the acute inflammatory response by targeting toll-like receptor 4. Cancer Chemother Pharmacol 2019; 84:287-298. [DOI: 10.1007/s00280-019-03844-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Accepted: 04/16/2019] [Indexed: 12/27/2022]
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170
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Lu M, Zhu X, Yang Z, Zhang W, Sun Z, Ji Q, Chen X, Zhu J, Wang C, Nie S. E3 ubiquitin ligase tripartite motif 7 positively regulates the TLR4-mediated immune response via its E3 ligase domain in macrophages. Mol Immunol 2019; 109:126-133. [PMID: 30928727 DOI: 10.1016/j.molimm.2019.01.015] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 01/22/2019] [Accepted: 01/25/2019] [Indexed: 02/06/2023]
Abstract
Members of the tripartite motif (TRIM) family as E3 ubiquitin ligases have been regarded as critical regulators of innate immunity and antiviral response. However, the role of TRIM7 is still elusive. Here, we provide evidence for the importance of TRIM7 in regulation of the TLR4-mediated innate response. In detail, we find that TRIM7 is highly expressed in antigen-presenting cells like macrophages. Knockdown of TRIM7 clearly inhibits the LPS-induced production of IFN-β, TNF-α and IL-6 in macrophages. Conversely, forced expression of TRIM7 could exert an opposite effect on these pro-inflammatory cytokines. Further analysis indicates that such effect is mediated by the TLR4-associated signaling pathways including MAPKs, NF-κB and IRF3-involved pathways. Truncation of the E3 ligase domain on TRIM7 may reduce the production of pro-inflammatory cytokines, suggesting a critical role of this domain in the regulation of LPS-initiated innate response. Taken together, we report here that TRIM7 may facilitate the TLR4-mediated innate response via its E3 ligase domain in macrophages, which provides new insight into the mechanistic role of TRIM7 in innate immunity.
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Affiliation(s)
- Mingfeng Lu
- Department of Emergency Medicine, Jinling Clinical Medical College of Nanjing Medical University, Nanjing, China; Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, China; Department of Emergency Medicine, Northern Jiangsu People's Hospital Affiliated to Yangzhou University, Yangzhou, China
| | - Xuhui Zhu
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, China; Department of Epidemiology and Microbiology, Huadong Medical Institute of Biotechniques, Nanjing, China
| | - Zhizhou Yang
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Wei Zhang
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Zhaorui Sun
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Qijian Ji
- Department of Emergency Medicine, Jinling Clinical Medical College of Nanjing Medical University, Nanjing, China; Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Xin Chen
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, China
| | - Jin Zhu
- Department of Epidemiology and Microbiology, Huadong Medical Institute of Biotechniques, Nanjing, China
| | - Changjun Wang
- Department of Epidemiology and Microbiology, Huadong Medical Institute of Biotechniques, Nanjing, China
| | - Shinan Nie
- Department of Emergency Medicine, Jinling Clinical Medical College of Nanjing Medical University, Nanjing, China; Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, China.
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171
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Marongiu L, Gornati L, Artuso I, Zanoni I, Granucci F. Below the surface: The inner lives of TLR4 and TLR9. J Leukoc Biol 2019; 106:147-160. [PMID: 30900780 PMCID: PMC6597292 DOI: 10.1002/jlb.3mir1218-483rr] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 03/07/2019] [Accepted: 03/07/2019] [Indexed: 12/12/2022] Open
Abstract
TLRs are a class of pattern recognition receptors (PRRs) that detect invading microbes by recognizing pathogen-associated molecular patterns (PAMPs). Upon PAMP engagement, TLRs activate a signaling cascade that leads to the production of inflammatory mediators. The localization of TLRs, either on the plasma membrane or in the endolysosomal compartment, has been considered to be a fundamental aspect to determine to which ligands the receptors bind, and which transduction pathways are induced. However, new observations have challenged this view by identifying complex trafficking events that occur upon TLR-ligand binding. These findings have highlighted the central role that endocytosis and receptor trafficking play in the regulation of the innate immune response. Here, we review the TLR4 and TLR9 transduction pathways and the importance of their different subcellular localization during the inflammatory response. Finally, we discuss the implications of TLR9 subcellular localization in autoimmunity.
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Affiliation(s)
- Laura Marongiu
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Laura Gornati
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Irene Artuso
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Ivan Zanoni
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milan, Italy.,Harvard Medical School and Division of Gastroenterology, Boston Children's Hospital, Boston, Massachusetts, USA
| | - Francesca Granucci
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milan, Italy
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172
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Kumar V. Toll-like receptors in the pathogenesis of neuroinflammation. J Neuroimmunol 2019; 332:16-30. [PMID: 30928868 DOI: 10.1016/j.jneuroim.2019.03.012] [Citation(s) in RCA: 211] [Impact Index Per Article: 42.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 03/19/2019] [Accepted: 03/19/2019] [Indexed: 12/17/2022]
Abstract
Toll-like receptors (TLRs) are discovered as crucial pattern recognition receptors (PRRs) involved in the recognition of pathogen-associated molecular patterns (PAMPs). Later studies showed their involvement in the recognition of various damage/danger-associated molecular patterns (DAMPs) generated by host itself. Thus, TLRs are capable of recognizing wide-array of patterns/molecules derived from pathogens and host as well and initiating a proinflammatory immune response through the activation of NF-κB and other transcription factors causing synthesis of proinflammatory molecules. The process of neuroinflammation is seen under both sterile and infectious inflammatory diseases of the central nervous system (CNS) and may lead to the development of neurodegeneration. The present article is designed to highlight the importance of TLRs in the pathogenesis of neuroinflammation under diverse conditions. TLRs are expressed by various immune cells present in CNS along with neurons. However out of thirteen TLRs described in mammals, some are present and active in these cells, while some are absent and are described in detail in main text. The role of various immune cells present in the brain and their role in the pathogenesis of neuroinflammation depending on the type of TLR expressed is described. Thereafter the role of TLRs in bacterial meningitis, viral encephalitis, stroke, Alzheimer's disease (AD), Parkinson's disease (PD), and autoimmune disease including multiple sclerosis (MS) is described. The article is designed for both neuroscientists needing information regarding TLRs in neuroinflammation and TLR biologists or immunologists interested in neuroinflammation.
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Affiliation(s)
- V Kumar
- Children Health Clinical Unit, School of Clinical Medicine, Faculty of Medicine, Mater Research, University of Queensland, ST Lucia, Brisbane, Queensland 4078, Australia; School of Biomedical Sciences, Faculty of Medicine, University of Queensland, ST Lucia, Brisbane, Queensland 4078, Australia.
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173
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Pfalzgraff A, Weindl G. Intracellular Lipopolysaccharide Sensing as a Potential Therapeutic Target for Sepsis. Trends Pharmacol Sci 2019; 40:187-197. [DOI: 10.1016/j.tips.2019.01.001] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Revised: 12/20/2018] [Accepted: 01/07/2019] [Indexed: 12/22/2022]
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174
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Töpfer N, Müller MM, Dahms M, Ramoji A, Popp J, Slevogt H, Neugebauer U. Raman spectroscopy reveals LPS-induced changes of biomolecular composition in monocytic THP-1 cells in a label-free manner. Integr Biol (Camb) 2019; 11:87-98. [PMID: 31083720 DOI: 10.1093/intbio/zyz009] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 03/01/2019] [Accepted: 03/20/2019] [Indexed: 12/23/2022]
Abstract
The human innate immune system is able to recognize pathogen-associated molecular patterns like lipopolysaccharides (LPS) leading to the activation of signal cascades and the release of different cytokines. Activation of the immune cells can be assessed in different ways which are either indirect (ELISA of cytokine release), require staining protocols (flow cytometry) or lysis of the cells (mRNA analysis). Here, Raman spectroscopy as a non-destructive spectroscopic method is presented to enable direct and label-free monitoring of changes in cellular metabolism, biomolecular composition as well as morphology. Exemplarily, the potential of Raman spectroscopy is presented for the characterization of LPS-stimulation of monocytic THP-1 cells over a time course of 16 h. The cell culture stimulation model is characterized using gene transcription and expression of the two cytokines TNFα and IL-1β. After 1 h, 3 h, 8 h and 16 h specific Raman spectroscopic fingerprints are generated which encode cell activation pattern after TLR4 stimulation. Most prevalent changes in the spectra occur after 8 h, but slight differences are already detectable after 1 h. Spatially highly resolved Raman scans are used to generate false-color Raman images which provide spatial information of the biochemical state of the cells and changes over time. One of the most significant observed differences is an increase in Raman signal from DNA/RNA content in LPS-stimulated cells when compared to unstimulated cells. The systematic assignment of Raman spectroscopic profiles of LPS-activated cells to cellular activation assessed by cytokine gene transcription and expression opens new ways for label-free and direct immunological studies of specific pathogen recognizing receptors and their downstream signaling pathways.
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Affiliation(s)
- Natalie Töpfer
- Leibniz Institute of Photonic Technology, Jena, Germany
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany
| | - Mario M Müller
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany
- Host Septomics, Jena University Hospital, Jena, Germany
| | - Marcel Dahms
- Leibniz Institute of Photonic Technology, Jena, Germany
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany
- Institute for Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Jena, Germany
- InfectoGnostics Research Campus Jena, Reg. Assoc., Jena, Germany
| | - Anuradha Ramoji
- Leibniz Institute of Photonic Technology, Jena, Germany
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany
| | - Jürgen Popp
- Leibniz Institute of Photonic Technology, Jena, Germany
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany
- Institute for Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Jena, Germany
- InfectoGnostics Research Campus Jena, Reg. Assoc., Jena, Germany
| | - Hortense Slevogt
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany
- Host Septomics, Jena University Hospital, Jena, Germany
| | - Ute Neugebauer
- Leibniz Institute of Photonic Technology, Jena, Germany
- Center for Sepsis Control and Care, Jena University Hospital, Jena, Germany
- Institute for Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Jena, Germany
- InfectoGnostics Research Campus Jena, Reg. Assoc., Jena, Germany
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175
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Guo H, Xie M, Zhou C, Zheng M. The relevance of pyroptosis in the pathogenesis of liver diseases. Life Sci 2019; 223:69-73. [PMID: 30831126 DOI: 10.1016/j.lfs.2019.02.060] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Revised: 02/28/2019] [Accepted: 02/28/2019] [Indexed: 12/17/2022]
Abstract
Pyroptosis is a novel programmed cell death form which is distinct from other types of cell death. As an inherently inflammatory process, it plays a vital role in cellular lysis and release of pro-inflammatory cytokines when hosts defend against infections. Recent studies have reported that pyroptosis was involved in liver diseases and had important functions in the progress and development of liver diseases. Here, we addressed the potential role of pyroptosis in liver diseases on the basis of brief introduction of the morphological characteristics, molecular and pathophysiological mechanisms of pyroptosis.
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Affiliation(s)
- Huiting Guo
- The State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University. Hangzhou, 310000, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Hangzhou 310000, China
| | - Mingjie Xie
- The State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University. Hangzhou, 310000, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Hangzhou 310000, China
| | - Cheng Zhou
- The State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University. Hangzhou, 310000, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Hangzhou 310000, China.
| | - Min Zheng
- The State Key Laboratory for Diagnosis and Treatment of Infectious Diseases, The First Affiliated Hospital, Zhejiang University. Hangzhou, 310000, China; Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, Hangzhou 310000, China.
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176
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Whitney J, Haase B, Beatty J, Barrs VR. Breed-specific variations in the coding region of toll-like receptor 4 in the domestic cat. Vet Immunol Immunopathol 2019; 209:61-69. [PMID: 30885307 PMCID: PMC7126157 DOI: 10.1016/j.vetimm.2019.02.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Revised: 02/01/2019] [Accepted: 02/25/2019] [Indexed: 12/15/2022]
Abstract
Specific point mutations in the human toll-like receptor 4 (TLR4) confer altered risk for diverse diseases including sepsis, aspergillosis and inflammatory bowel disease. Some of these TLR4 polymorphisms are racially specific. We hypothesised that feline TLR4 polymorphisms might underlie an observed increased risk to infectious and inflammatory diseases in some cat breeds. The aim of this study was to identify breed-specific variations in the coding region of feline TLR4 and to model the effect of mutations on protein structure and function in silico. The entire coding region of TLR4 was sequenced in 8 groups (7 pure-bred, 1 crossbred) of domestic cats (Felis catus) comprising 158 individuals. Twenty-two single nucleotide polymorphisms (SNPs) were identified in TLR4, with 16 located in the coding region (11 non-synonymous) and four in the 3′UTR. Comparison of breed specific allelic frequencies indicated that Burmese and British shorthairs most commonly differed from other breeds. In silico analyses to predict the impact of the 11 non-synonymous variants indicated a deleterious effect on protein structure for one SNP (c.869 G > A), which was not associated with a specific breed. Overall, findings from this study do not support a role of TLR4 dysfunction in breed-predispositions to infectious diseases in domestic cats in Australia.
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Affiliation(s)
- J Whitney
- Sydney School of Veterinary Science, Faculty of Science, University of Sydney, NSW 2006, Australia.
| | - B Haase
- Sydney School of Veterinary Science, Faculty of Science, University of Sydney, NSW 2006, Australia.
| | - J Beatty
- Sydney School of Veterinary Science, Faculty of Science, University of Sydney, NSW 2006, Australia; Marie Bashir Institute of Infectious Diseases and Biosecurity, University of Sydney, NSW 2006, Australia.
| | - V R Barrs
- Sydney School of Veterinary Science, Faculty of Science, University of Sydney, NSW 2006, Australia; Marie Bashir Institute of Infectious Diseases and Biosecurity, University of Sydney, NSW 2006, Australia.
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177
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Increased TLR4 Expression Aggravates Sepsis by Promoting IFN- γ Expression in CD38 -/- Mice. J Immunol Res 2019; 2019:3737890. [PMID: 30915370 PMCID: PMC6399547 DOI: 10.1155/2019/3737890] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 11/07/2018] [Accepted: 12/02/2018] [Indexed: 12/23/2022] Open
Abstract
Gram-negative bacterial sepsis accounts for up to 50% worldwide sepsis that causes hospital mortality. Acute kidney injury (AKI), a common complication of Gram-negative bacterial sepsis, is caused by Toll-like receptor 4 (TLR4) activation. Lipopolysaccharide (LPS) is an endotoxin in Gram-negative bacteria and is recognized specifically by TLR4, which initiates innate immune response. Also, TLR4 signaling pathway activation is essential in response to LPS infection. CD38 is one of the well-known regulators of innate immunity, whose dysregulation contributes to sepsis. Many studies have proven that an attenuated Gram-positive bacterium induces sepsis in a CD38-blocking model. However, the pathogenesis of Gram-negative bacteria-induced sepsis in a CD38−/− mouse model remains unclear. The aim of this study is to investigate whether kidney injury is still attenuated in a LPS-induced CD38−/− sepsis model and identify the potential mechanism. We assess the severity of kidney injury related to proinflammatory cytokine expressions (IFN-γ, TNF-α, IL-1β, and IL-6) in WT and CD38−/− mice. Our results showed more aggravated kidney damage in CD38−/− mice than in WT mice, accompanied with an increase of proinflammatory cytokine expression. In addition, compared with CD38−/−TLR4mut mice, we found an increase of TLR4 expression and mRNA expression of these cytokines in the kidney of CD38−/− mice, although only increased IFN-γ level was detected in the serum. Taken together, these results demonstrated that an increased TLR4 expression in CD38−/− mice could contribute to the aggravation of AKI through boosting of the production of IFN-γ.
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178
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Cai B, Seong KJ, Bae SW, Kook MS, Chun C, Lee JH, Choi WS, Jung JY, Kim WJ. Water-Soluble Arginyl–Diosgenin Analog Attenuates Hippocampal Neurogenesis Impairment Through Blocking Microglial Activation Underlying NF-κB and JNK MAPK Signaling in Adult Mice Challenged by LPS. Mol Neurobiol 2019; 56:6218-6238. [DOI: 10.1007/s12035-019-1496-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 01/15/2019] [Indexed: 12/20/2022]
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179
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Chang YY, Lin TY, Kao MC, Chen TY, Cheng CF, Wong CS, Huang CJ. Magnesium sulfate inhibits binding of lipopolysaccharide to THP-1 cells by reducing expression of cluster of differentiation 14. Inflammopharmacology 2019; 27:249-260. [PMID: 30721372 DOI: 10.1007/s10787-019-00568-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 01/18/2019] [Indexed: 12/28/2022]
Abstract
We investigated effects of magnesium sulfate (MgSO4) on modulating lipopolysaccharide (LPS)-macrophage binding and cluster of differentiation 14 (CD14) expression. Flow cytometry data revealed that the mean levels of LPS-macrophage binding and membrane-bound CD14 expression (mCD14) in differentiated THP-1 cells (a human monocytic cell line) treated with LPS plus MgSO4 (the LPS + M group) decreased by 28.2% and 25.3% compared with those THP-1 cells treated with LPS only (the LPS group) (P < 0.001 and P = 0.037), indicating that MgSO4 significantly inhibits LPS-macrophage binding and mCD14 expression. Notably, these effects of MgSO4 were counteracted by L-type calcium channel activation. Moreover, the mean level of soluble CD14 (sCD14; proteolytic cleavage product of CD14) in the LPS + M group was 25.6% higher than in the LPS group (P < 0.001), indicating that MgSO4 significantly enhances CD14 proteolytic cleavage. Of note, serine protease inhibition mitigated effects of MgSO4 on both decreasing mCD14 and increasing sCD14. In conclusion, MgSO4 inhibits LPS-macrophage binding through reducing CD14 expression. The mechanisms may involve antagonizing L-type calcium channels and activating serine proteases.
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Affiliation(s)
- Ya-Ying Chang
- Institute of Medical Sciences, College of Medicine, Tzu Chi University, Hualien, Taiwan.,Department of Anesthesiology, Far Eastern Memorial Hospital, New Taipei City, Taiwan
| | - Tzu-Yu Lin
- Department of Anesthesiology, Far Eastern Memorial Hospital, New Taipei City, Taiwan.,Department of Mechanical Engineering, Yuan Ze University, Taoyüan, Taiwan
| | - Ming-Chang Kao
- Department of Anesthesiology, Taipei Tzu Chi Hospital, New Taipei City, Taiwan.,School of Medicine, College of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Tsung-Ying Chen
- School of Medicine, College of Medicine, Tzu Chi University, Hualien, Taiwan.,Departments of Anesthesiology, Hualien Tzu Chi Hospital, Hualien, Taiwan
| | - Ching-Feng Cheng
- Institute of Medical Sciences, College of Medicine, Tzu Chi University, Hualien, Taiwan.,Department of Pediatrics, Hualien Tzu Chi Hospital, Hualien, Taiwan
| | - Chih-Shung Wong
- Department of Anesthesiology, Cathay General Hospital, Taipei, Taiwan
| | - Chun-Jen Huang
- Department of Anesthesiology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan. .,Graduate Institute of Clinical Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.
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180
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Palikhe S, Ohashi W, Sakamoto T, Hattori K, Kawakami M, Andoh T, Yamazaki H, Hattori Y. Regulatory Role of GRK2 in the TLR Signaling-Mediated iNOS Induction Pathway in Microglial Cells. Front Pharmacol 2019; 10:59. [PMID: 30778300 PMCID: PMC6369205 DOI: 10.3389/fphar.2019.00059] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Accepted: 01/18/2019] [Indexed: 12/31/2022] Open
Abstract
G protein-coupled receptor kinase 2 (GRK2) is a ubiquitous member of the GRK family that restrains cellular activation by G protein-coupled receptor (GPCR) phosphorylation leading to receptor desensitization and internalization, but has been identified to regulate a variety of signaling molecules, among which may be associated with inflammation. In this study, we attempted to establish the regulatory role of GRK2 in the Toll-like receptor (TLR) signaling pathway for inducible nitric oxide synthase (iNOS) expression in microglial cells. When mouse MG6 cells were stimulated with the TLR4 ligands lipopolysaccharide (LPS) and paclitaxel, we found that interferon regulatory factor 1 (IRF1) protein expression and activation was upregulated, transcription of interferon-β (IFN-β) was accelerated, induction/activation of STAT1 and activation of STAT3 were promoted, and subsequently iNOS expression was upregulated. The ablation of GRK2 by small interfering RNAs (siRNAs) not only eliminated TLR4-mediated upregulation of IRF1 protein expression and nuclear translocation but also suppressed the activation of the STAT pathway, resulting in negating the iNOS upregulation. The TLR3-mediated changes in IRF1 and STAT1/3, leading to iNOS induction, were also abrogated by siRNA knockdown of GRK2. Furthermore, transfection of GRK2 siRNA blocked the exogenous IFN-β supplementation-induced increases in phosphorylation of STAT1 as well as STAT3 and abrogated the augmentation of iNOS expression in the presence of exogenous IFN-β. Taken together, our results show that GRK2 regulates the activation of IRF1 as well as the activation of the STAT pathway, leading to upregulated transcription of iNOS in activated microglial cells. Modulation of the TLR signaling pathway via GRK2 in microglia may be a novel therapeutic target for treatment of neuroinflammatory disorders.
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Affiliation(s)
- Sailesh Palikhe
- Department of Molecular and Medical Pharmacology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Wakana Ohashi
- Department of Molecular and Medical Pharmacology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Takuya Sakamoto
- Department of Molecular and Medical Pharmacology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Kohshi Hattori
- Department of Anesthesiology and Pain Relief Center, The University of Tokyo Hospital, Tokyo, Japan
| | - Masaaki Kawakami
- Department of Molecular and Medical Pharmacology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Tsugunobu Andoh
- Department of Applied Pharmacology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - Hiromi Yamazaki
- Faculty of Nursing Science, Tsuruga Nursing University, Tsuruga, Japan
| | - Yuichi Hattori
- Department of Molecular and Medical Pharmacology, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
- The Research Institute of Cancer Prevention, Health Sciences University of Hokkaido, Tobetsu, Japan
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181
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Xiao Q, Zhu X, Yang S, Wang J, Yin R, Song J, Ma A, Pan X. LPS induces CXCL16 expression in HUVECs through the miR-146a-mediated TLR4 pathway. Int Immunopharmacol 2019; 69:143-149. [PMID: 30710793 DOI: 10.1016/j.intimp.2019.01.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Revised: 12/23/2018] [Accepted: 01/08/2019] [Indexed: 02/08/2023]
Abstract
Endothelial inflammation characterizes the early stages of atherosclerosis. CXCL16 is a protein that functions as both a chemokine and adhesion molecule, playing a crucial role in the pathogenesis of atherosclerosis. However, it is uncertain if LPS, a major inducer of inflammation, affects CXCL16 expression in endothelial cells and whether miR-146a, a negative regulator of atherosclerosis, participates in this process. The present study showed that exposure of human umbilical vein endothelial cells (HUVECs) to LPS induced the overexpression of CXCL16, TLR4 and NF-κB, and this induction was blocked by the TLR4 inhibitor TAK-242. In addition, LPS induced the upregulation of miR-146a in HUVECs. Overexpression or inhibition of miR-146a either inhibited or increased the LPS-induced expression CXCL16, TLR4 and NF-κB protein production, respectively. Additionally, miR-146a-induced CXCL16 expression was blocked by TAK-242. Thus, in this study, we demonstrate that LPS stimulates CXCL16 expression via the TLR4/NF-κB signaling pathway, and simultaneously, miR-146 negatively regulates LPS-induced CXCL16 expression through a TLR4-dependent mechanism.
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Affiliation(s)
- Qi Xiao
- Department of Neurology, The Affiliated Hospital of the Qingdao University, Medical School of Qingdao University, Qingdao, Shandong Province 266100, China
| | - Xiaoyan Zhu
- Department of Neurology, The Affiliated Hospital of the Qingdao University, Medical School of Qingdao University, Qingdao, Shandong Province 266100, China
| | - Shaonan Yang
- Department of Neurology, The Affiliated Hospital of the Qingdao University, Medical School of Qingdao University, Qingdao, Shandong Province 266100, China
| | - Jing Wang
- Department of Neurology, The Affiliated Hospital of the Qingdao University, Medical School of Qingdao University, Qingdao, Shandong Province 266100, China
| | - Ruihua Yin
- Department of Neurology, The Affiliated Hospital of the Qingdao University, Medical School of Qingdao University, Qingdao, Shandong Province 266100, China
| | - Jinyang Song
- Department of Neurology, The Affiliated Hospital of the Qingdao University, Medical School of Qingdao University, Qingdao, Shandong Province 266100, China
| | - Aijun Ma
- Department of Neurology, The Affiliated Hospital of the Qingdao University, Medical School of Qingdao University, Qingdao, Shandong Province 266100, China.
| | - Xudong Pan
- Department of Neurology, The Affiliated Hospital of the Qingdao University, Medical School of Qingdao University, Qingdao, Shandong Province 266100, China.
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182
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Barker JH, Weiss JP. Detecting lipopolysaccharide in the cytosol of mammalian cells: Lessons from MD-2/TLR4. J Leukoc Biol 2019; 106:127-132. [PMID: 30694581 DOI: 10.1002/jlb.3mir1118-434r] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Revised: 01/09/2019] [Accepted: 01/12/2019] [Indexed: 12/21/2022] Open
Abstract
Proinflammatory immune responses to Gram-negative bacterial lipopolysaccharides (LPS) are crucial to innate host defenses but can also contribute to pathology. How host cells sensitively detect structural features of LPS was a mystery for years, especially given that a portion of the molecule essential for its potent proinflammatory properties-lipid A-is buried in the bacterial membrane. Studies of responses to extracellular and vacuolar LPS revealed a crucial role for accessory proteins that specifically bind LPS-rich membranes and extract LPS monomers to generate a complex of LPS, MD-2, and TLR4. These insights provided means to understand better both the remarkable host sensitivity to LPS and the means whereby specific LPS structural features are discerned. More recently, the noncanonical inflammasome, consisting of caspases-4/5 in humans and caspase-11 in mice, has been demonstrated to mediate responses to LPS that has reached the host cytosol. Precisely how LPS gains access to cytosolic caspases-and in what form-is not well characterized, and understanding this process will provide crucial insights into how the noncanonical inflammasome is regulated during infection. Herein, we briefly review what is known about LPS detection by cytosolic caspases-4/5/11, focusing on lessons derived from studies of the better-characterized TLR4 system that might direct future mechanistic questions.
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Affiliation(s)
- Jason H Barker
- Inflammation Program and the Departments of Internal Medicine and Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA.,The Veterans Affairs Medical Center, Iowa City, Iowa, USA
| | - Jerrold P Weiss
- Inflammation Program and the Departments of Internal Medicine and Microbiology, Carver College of Medicine, University of Iowa, Iowa City, Iowa, USA.,The Veterans Affairs Medical Center, Iowa City, Iowa, USA
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183
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Awasthi S, Singh B, Ramani V, Xie J, Kosanke S. TLR4-interacting SPA4 peptide improves host defense and alleviates tissue injury in a mouse model of Pseudomonas aeruginosa lung infection. PLoS One 2019; 14:e0210979. [PMID: 30689633 PMCID: PMC6349318 DOI: 10.1371/journal.pone.0210979] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2018] [Accepted: 01/04/2019] [Indexed: 11/18/2022] Open
Abstract
Interaction between surfactant protein-A (SP-A) and toll-like receptor (TLR)4 plays a critical role in host defense. In this work, we studied the host defense function of SPA4 peptide (amino acids GDFRYSDGTPVNYTNWYRGE), derived from the TLR4-interacting region of SP-A, against Pseudomonas aeruginosa. We determined the binding of SPA4 peptide to live bacteria, and its direct antibacterial activity against P. aeruginosa. Pro-phagocytic and anti-inflammatory effects were investigated in JAWS II dendritic cells and primary alveolar macrophages. The biological relevance of SPA4 peptide was evaluated in a mouse model of acute lung infection induced by intratracheal challenge with P. aeruginosa. Our results demonstrate that the SPA4 peptide does not interact with or kill P. aeruginosa when cultured outside the host. The SPA4 peptide treatment induces the uptake and localization of bacteria in the phagolysosomes of immune cells. At the same time, the secreted amounts of TNF-α are significantly reduced in cell-free supernatants of SPA4 peptide-treated cells. In cells overexpressing TLR4, the TLR4-induced phagocytic response is maintained, but the levels of TLR4-stimulated TNF-α are reduced. Furthermore, our results demonstrate that the therapeutic administration of SPA4 peptide reduces bacterial burden, inflammatory cytokines and chemokines, intracellular signaling, and lactate levels, and alleviates lung edema and tissue damage in P. aeruginosa-infected mice. Together, our results suggest that the treatment with SPA4 peptide can help control the bacterial burden, inflammation, and tissue injury in a P. aeruginosa lung infection model.
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Affiliation(s)
- Shanjana Awasthi
- Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center (OUHSC), Oklahoma City, Oklahoma, United States of America
- * E-mail:
| | - Bhupinder Singh
- Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center (OUHSC), Oklahoma City, Oklahoma, United States of America
| | - Vijay Ramani
- Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center (OUHSC), Oklahoma City, Oklahoma, United States of America
| | - Jun Xie
- Department of Pharmaceutical Sciences, University of Oklahoma Health Sciences Center (OUHSC), Oklahoma City, Oklahoma, United States of America
| | - Stanley Kosanke
- Department of Pathology, OUHSC, Oklahoma City, Oklahoma, United States of America
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184
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Startek JB, Boonen B, Talavera K, Meseguer V. TRP Channels as Sensors of Chemically-Induced Changes in Cell Membrane Mechanical Properties. Int J Mol Sci 2019; 20:E371. [PMID: 30654572 PMCID: PMC6359677 DOI: 10.3390/ijms20020371] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Revised: 01/11/2019] [Accepted: 01/12/2019] [Indexed: 12/19/2022] Open
Abstract
Transient Receptor Potential ion channels (TRPs) have been described as polymodal sensors, being responsible for transducing a wide variety of stimuli, and being involved in sensory functions such as chemosensation, thermosensation, mechanosensation, and photosensation. Mechanical and chemical stresses exerted on the membrane can be transduced by specialized proteins into meaningful intracellular biochemical signaling, resulting in physiological changes. Of particular interest are compounds that can change the local physical properties of the membrane, thereby affecting nearby proteins, such as TRP channels, which are highly sensitive to the membrane environment. In this review, we provide an overview of the current knowledge of TRP channel activation as a result of changes in the membrane properties induced by amphipathic structural lipidic components such as cholesterol and diacylglycerol, and by exogenous amphipathic bacterial endotoxins.
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Affiliation(s)
- Justyna B Startek
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven; VIB Center for Brain & Disease Research, Herestraat 49, Campus Gasthuisberg O&N1 bus 802, 3000 Leuven, Belgium.
| | - Brett Boonen
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven; VIB Center for Brain & Disease Research, Herestraat 49, Campus Gasthuisberg O&N1 bus 802, 3000 Leuven, Belgium.
| | - Karel Talavera
- Laboratory of Ion Channel Research, Department of Cellular and Molecular Medicine, KU Leuven; VIB Center for Brain & Disease Research, Herestraat 49, Campus Gasthuisberg O&N1 bus 802, 3000 Leuven, Belgium.
| | - Victor Meseguer
- Instituto de Neurociencias de Alicante, Universidad Miguel Hernández y CSIC, E-03550 Alicante , Spain.
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185
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Affiliation(s)
- Didier Payen
- UMR Inserm 1160, Université Paris 7 Denis-Diderot, Paris Cité Sorbone, France.
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186
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Lee AH, Ledderose C, Xiaoou L, Slubowski CJ, Sueyoshi K, Staudenmaier L, Bao Y, Zhang J, Junger WG. Adenosine Triphosphate Release is Required for Toll-Like Receptor-Induced Monocyte/Macrophage Activation, Inflammasome Signaling, Interleukin-1β Production, and the Host Immune Response to Infection. Crit Care Med 2018; 46:e1183-e1189. [PMID: 30247270 PMCID: PMC6239954 DOI: 10.1097/ccm.0000000000003446] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
OBJECTIVES Monocytes and macrophages produce interleukin-1β by inflammasome activation which involves adenosine triphosphate release, pannexin-1 channels, and P2X7 receptors. However, interleukin-1β can also be produced in an inflammasome-independent fashion. Here we studied if this mechanism also involves adenosine triphosphate signaling and how it contributes to inflammasome activation. DESIGN In vitro studies with human cells and randomized animal experiments. SETTING Preclinical academic research laboratory. SUBJECTS Wild-type C57BL/6 and pannexin-1 knockout mice, healthy human subjects for cell isolation. INTERVENTIONS Human monocytes and U937 macrophages were treated with different inhibitors to study how purinergic signaling contributes to toll-like receptor-induced cell activation and interleukin-1β production. Wild-type and pannexin-1 knockout mice were subjected to cecal ligation and puncture to study the role of purinergic signaling in interleukin-1β production and host immune defense. MEASUREMENTS AND MAIN RESULTS Toll-like receptor agonists triggered mitochondrial adenosine triphosphate production and adenosine triphosphate release within seconds. Inhibition of mitochondria, adenosine triphosphate release, or P2 receptors blocked p38 mitogen-activated protein kinase and caspase-1 activation and interleukin-1β secretion. Mice lacking pannexin-1 failed to activate monocytes, to produce interleukin-1β, and to effectively clear bacteria following cecal ligation and puncture. CONCLUSIONS Purinergic signaling has two separate roles in monocyte/macrophage activation, namely to facilitate the initial detection of danger signals via toll-like receptors and subsequently to regulate nucleotide-binding oligomerization domain, leucine rich repeat and pyrin domain containing 3 inflammasome activation. Further dissection of these mechanisms may reveal novel therapeutic targets for immunomodulation in critical care patients.
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Affiliation(s)
- Albert H. Lee
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Carola Ledderose
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Li Xiaoou
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
- Department of Respiratory Medicine, West China Hospital, West China School of Medicine, Sichuan University, Chengdu, Sichuan, China
| | - Christian J. Slubowski
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Koichiro Sueyoshi
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Laura Staudenmaier
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Yi Bao
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Jingping Zhang
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Wolfgang G. Junger
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
- Ludwig Boltzmann Institute for Traumatology, Vienna, A-1200 Austria
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187
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Luo X, Zhang X, Gan L, Zhou C, Zhao T, Zeng T, Liu S, Xiao Y, Yu J, Zhao F. The outer membrane protein Tp92 of Treponema pallidum induces human mononuclear cell death and IL-8 secretion. J Cell Mol Med 2018; 22:6039-6054. [PMID: 30596396 PMCID: PMC6237608 DOI: 10.1111/jcmm.13879] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Accepted: 07/30/2018] [Indexed: 12/19/2022] Open
Abstract
Treponema pallidum is the pathogen that causes syphilis, a sexually transmitted disease; however, the pathogenic mechanism of this organism remains unclear. Tp92 is the only T. pallidum outer membrane protein that has structural features similar to the outer membrane proteins of other Gram-negative bacteria, but the exact functions of this protein remain unknown. In the present study, we demonstrated that the recombinant Tp92 protein can induce human mononuclear cell death. Tp92 mediated the human monocytic cell line derived from an acute monicytic leukemia patient (THP-1) cell death by recognizing CD14 and/or TLR2 on cell surfaces. After the stimulation of THP-1 cells by the Tp92 protein, Tp92 may induce atypical pyroptosis of THP-1 cells via the pro-caspase-1 pathway. Meanwhile, this protein caused the apoptosis of THP-1 cells via the receptor-interacting protein kinase 1/caspase-8/aspase-3 pathway. Tp92 reduced the number of monocytes among peripheral blood mononuclear cells. Interestingly, further research showed that Tp92 failed to increase the tumour necrosis factor-α, interleukin (IL)-1β, IL-6, IL-10, IL-18 and monocyte chemotactic protein 1 (MCP)-1 levels but slightly elevated the IL-8 levels via the Nuclear Factor (NF)-κB pathway in THP-1 cells. The data suggest that Tp92 recognizes CD14 and TLR2, transfers the signal to a downstream pathway, and activates NF-κB to mediate the production of IL-8. This mechanism may help T. pallidum escape recognition and elimination by the host innate immune system.
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MESH Headings
- Antigens, Surface/genetics
- Bacterial Proteins/genetics
- Caspase 1/genetics
- Cell Death/genetics
- Cell Line, Tumor
- Cytokines/genetics
- Host-Pathogen Interactions/genetics
- Humans
- Interleukin-8/genetics
- Leukemia, Monocytic, Acute/genetics
- Leukemia, Monocytic, Acute/microbiology
- Leukemia, Monocytic, Acute/pathology
- Leukocytes, Mononuclear/microbiology
- Leukocytes, Mononuclear/pathology
- Lipopolysaccharide Receptors/genetics
- NF-kappa B/genetics
- Recombinant Proteins/genetics
- Signal Transduction/genetics
- Syphilis/genetics
- Syphilis/microbiology
- Syphilis/pathology
- Toll-Like Receptor 2/genetics
- Treponema pallidum/genetics
- Treponema pallidum/pathogenicity
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Affiliation(s)
- Xi Luo
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan ProvinceCollaborative Innovation Center for New Molecular Drug ResearchUniversity of South ChinaHengyangChina
| | - Xiaohong Zhang
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan ProvinceCollaborative Innovation Center for New Molecular Drug ResearchUniversity of South ChinaHengyangChina
- Department of Histology and EmbryologySchool of MedicineUniversity of South ChinaHengyangChina
| | - Lin Gan
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan ProvinceCollaborative Innovation Center for New Molecular Drug ResearchUniversity of South ChinaHengyangChina
| | - Chenglong Zhou
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan ProvinceCollaborative Innovation Center for New Molecular Drug ResearchUniversity of South ChinaHengyangChina
| | - Tie Zhao
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan ProvinceCollaborative Innovation Center for New Molecular Drug ResearchUniversity of South ChinaHengyangChina
| | - Tiebing Zeng
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan ProvinceCollaborative Innovation Center for New Molecular Drug ResearchUniversity of South ChinaHengyangChina
| | - Shuangquan Liu
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan ProvinceCollaborative Innovation Center for New Molecular Drug ResearchUniversity of South ChinaHengyangChina
- Department of Clinical LaboratoryThe First Affiliated Hospital of University of South ChinaHengyangChina
| | - Yongjian Xiao
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan ProvinceCollaborative Innovation Center for New Molecular Drug ResearchUniversity of South ChinaHengyangChina
- Department of Clinical LaboratoryThe Second Affiliated Hospital of University of South ChinaHengyangChina
| | - Jian Yu
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan ProvinceCollaborative Innovation Center for New Molecular Drug ResearchUniversity of South ChinaHengyangChina
| | - Feijun Zhao
- Institute of Pathogenic Biology and Key Laboratory of Special Pathogen Prevention and Control of Hunan ProvinceCollaborative Innovation Center for New Molecular Drug ResearchUniversity of South ChinaHengyangChina
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188
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Lu XJ, Ning YJ, Liu H, Nie L, Chen J. A Novel Lipopolysaccharide Recognition Mechanism Mediated by Internalization in Teleost Macrophages. Front Immunol 2018; 9:2758. [PMID: 30542348 PMCID: PMC6277787 DOI: 10.3389/fimmu.2018.02758] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 11/09/2018] [Indexed: 01/02/2023] Open
Abstract
Macrophages in teleosts are less sensitive to lipopolysaccharide (LPS) compared to mammals. The functional equivalent of the mammalian LPS surface receptor in teleost macrophages for the pro-inflammatory response is either non-existent or replaced by negative regulation. LPS signaling in teleost macrophages remains unclear. Here, we found a scavenger receptor class B 2a (PaSRB2a) that played a crucial role in LPS signaling in teleost macrophages. The internalization of LPS and subsequent pro-inflammatory responses in macrophages were mediated by PaSRB2a, which is a novel isoform of the mammalian SRB2 gene. LPS internalization by PaSRB2a is dependent on its C-terminal intracellular domain. Following LPS internalization, it interacts with the ayu intracellular receptors nucleotide-binding oligomerization domain protein 1 (PaNOD1) and PaNOD2. Moreover, LPS pre-stimulation with sub-threshold concentrations reduced the effect of secondary LPS treatment on pro-inflammatory responses that were mediated by PaSRB2a. The pro-inflammatory responses in LPS-treated ayu were down-regulated upon PaSRB2a knockdown by lentivirus siRNA delivery. In grass carp and spotted green pufferfish, SRB2a also mediated LPS internalization and pro-inflammatory responses. Our work identifies a novel LPS signaling pathway in teleosts that differs from those in mammals, and contributes to our understanding of the evolution of pathogen recognition in vertebrates.
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Affiliation(s)
- Xin-Jiang Lu
- Laboratory of Biochemistry and Molecular Biology, Ningbo University, Ningbo, China.,Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Ningbo University, Ningbo, China
| | - Ying-Jun Ning
- Laboratory of Biochemistry and Molecular Biology, Ningbo University, Ningbo, China
| | - He Liu
- Laboratory of Biochemistry and Molecular Biology, Ningbo University, Ningbo, China
| | - Li Nie
- Laboratory of Biochemistry and Molecular Biology, Ningbo University, Ningbo, China.,Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Ningbo University, Ningbo, China
| | - Jiong Chen
- Laboratory of Biochemistry and Molecular Biology, Ningbo University, Ningbo, China.,Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Ningbo University, Ningbo, China
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189
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Li P, Wu YH, Zhu YT, Li MX, Pei HH. Requirement of Rab21 in LPS-induced TLR4 signaling and pro-inflammatory responses in macrophages and monocytes. Biochem Biophys Res Commun 2018; 508:169-176. [PMID: 30471852 DOI: 10.1016/j.bbrc.2018.11.074] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 11/12/2018] [Indexed: 12/13/2022]
Abstract
Lipopolysaccharide (LPS) induces macrophage/monocyte activation and pro-inflammatory cytokines production by activating Toll-like receptor 4 (TLR-4) signaling. Rab GTPase 21 (Rab21) is a member of the Rab GTPase subfamily. In the present study, we show that LPS induced TLR4 and Rab21 association and endosomal translocation in murine bone marrow-derived macrophages (BMDMs) and primary human peripheral blood mononuclear cells (PBMCs). In BMDMs, shRNA-mediated stable knockdown of Rab21 inhibited LPS-induced expression and production of pro-inflammatory cytokines (IL-1β, IL-6 and TNF-α). Conversely, forced overexpression of Rab21 by an adenovirus construct potentiated LPS-induced IL-1β, IL-6 and TNF-α production in BMDMs. Further studies show that LPS-induced TLR4 endosomal traffic and downstream c-Jun and NFκB (nuclear factor-kappa B) activation were significantly inhibited by Rab21 shRNA, but intensified with Rab21 overexpression in BMDMs. Finally, in the primary human PBMCs, siRNA-induced knockdown of Rab21 significantly inhibited LPS-induced IL-1β, IL-6 and TNF-α production. Taken together, we suggest that Rab21 regulates LPS-induced pro-inflammatory responses by promoting TLR4 endosomal traffic and downstream signaling activation.
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Affiliation(s)
- Ping Li
- Department of Emergency, The Second Affiliated Hospital of Xi'an Jiao Tong University, Xi'an, China
| | - Yong-Hong Wu
- Lab of Clinical Immunology and Pathogen Detection, Xi'an Medical University, Xi'an, China
| | - Yan-Ting Zhu
- Department of Respiration, The First Affiliated Hospital of Xi'an Jiao Tong University, Xi'an, China
| | - Man-Xiang Li
- Department of Respiration, The First Affiliated Hospital of Xi'an Jiao Tong University, Xi'an, China.
| | - Hong-Hong Pei
- Department of Emergency, The Second Affiliated Hospital of Xi'an Jiao Tong University, Xi'an, China.
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190
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Huggard D, McGrane F, Lagan N, Roche E, Balfe J, Leahy TR, Franklin O, Moreno A, Melo AM, Doherty DG, Molloy EJ. Altered endotoxin responsiveness in healthy children with Down syndrome. BMC Immunol 2018; 19:31. [PMID: 30390640 PMCID: PMC6215672 DOI: 10.1186/s12865-018-0270-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Accepted: 10/18/2018] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Down syndrome (DS) is the most common syndromic immunodeficiency with an increased risk of infection, mortality from sepsis, and autoinflammation. Innate immune function is altered in DS and therefore we examined responses in CD11b and Toll like receptor 4 (TLR-4), which are important immune cell surface markers upregulated in response to Lipopolysaccharide (LPS) endotoxin, and the immunomodulator melatonin. Neutrophil and monocyte responses to LPS and melatonin in children with Down syndrome (DS) who were clinically stable were compared to age-matched controls. Whole blood was incubated with LPS and melatonin and the relative expression of CD11b and TLR-4 evaluated by flow cytometry. RESULTS Children with DS had an increased response to LPS in neutrophils and intermediate monocytes, while also having elevated TLR-4 expression on non-classical monocytes compared to controls at baseline. Melatonin reduced CD11b expression on neutrophils, total monocytes, both classical and intermediate sub-types, in children with DS and controls. CONCLUSION Melatonin could represent a useful clinical adjunct in the treatment of sepsis as an immunomodulator. Children with DS had increased LPS responses which may contribute to the more adverse outcomes seen in sepsis.
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Affiliation(s)
- Dean Huggard
- Paediatrics, Trinity College, the University of Dublin, Dublin, Ireland. .,Trinity Translational Medicine Institute (TTMI), Trinity College Dublin, Dublin, Ireland. .,Paediatrics, Tallaght Hospital, Dublin, Ireland. .,National Children's Research Centre, Our Lady's Children's Hospital, Crumlin, Dublin, Ireland. .,Department of Paediatrics, Trinity Centre for Health Sciences, Tallaght Hospital, Dublin, 24, Ireland.
| | - Fiona McGrane
- Paediatrics, Trinity College, the University of Dublin, Dublin, Ireland.,Paediatrics, Tallaght Hospital, Dublin, Ireland
| | - Niamh Lagan
- Paediatrics, Trinity College, the University of Dublin, Dublin, Ireland.,Paediatrics, Tallaght Hospital, Dublin, Ireland
| | - Edna Roche
- Paediatrics, Trinity College, the University of Dublin, Dublin, Ireland.,Paediatrics, Tallaght Hospital, Dublin, Ireland
| | - Joanne Balfe
- Paediatrics, Trinity College, the University of Dublin, Dublin, Ireland.,Paediatrics, Tallaght Hospital, Dublin, Ireland
| | - Timothy Ronan Leahy
- Paediatrics, Trinity College, the University of Dublin, Dublin, Ireland.,Immunology, Our Lady's Children's Hospital, Crumlin, Dublin, Ireland
| | - Orla Franklin
- Paediatrics, Trinity College, the University of Dublin, Dublin, Ireland.,Cardiology, Our Lady's Children's Hospital, Crumlin, Dublin, Ireland
| | - Ana Moreno
- Paediatrics, Trinity College, the University of Dublin, Dublin, Ireland.,Trinity Translational Medicine Institute (TTMI), Trinity College Dublin, Dublin, Ireland
| | - Ashanty M Melo
- Paediatrics, Trinity College, the University of Dublin, Dublin, Ireland.,Trinity Translational Medicine Institute (TTMI), Trinity College Dublin, Dublin, Ireland
| | - Derek G Doherty
- Paediatrics, Trinity College, the University of Dublin, Dublin, Ireland.,Trinity Translational Medicine Institute (TTMI), Trinity College Dublin, Dublin, Ireland
| | - Eleanor J Molloy
- Paediatrics, Trinity College, the University of Dublin, Dublin, Ireland.,Trinity Translational Medicine Institute (TTMI), Trinity College Dublin, Dublin, Ireland.,Paediatrics, Tallaght Hospital, Dublin, Ireland.,Coombe Women and Infants University Hospital, Dublin, Ireland.,Neonatology, Our Lady's Children's Hospital, Crumlin, Dublin, Ireland.,National Children's Research Centre, Our Lady's Children's Hospital, Crumlin, Dublin, Ireland
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191
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Järver P, Dondalska A, Poux C, Sandberg A, Bergenstråhle J, Sköld AE, Dereuddre-Bosquet N, Martinon F, Pålsson S, Zaghloul E, Brodin D, Sander B, Lennox KA, Behlke MA, El-Andaloussi S, Lehtiö J, Lundeberg J, LeGrand R, Spetz AL. Single-Stranded Nucleic Acids Regulate TLR3/4/7 Activation through Interference with Clathrin-Mediated Endocytosis. Sci Rep 2018; 8:15841. [PMID: 30367171 PMCID: PMC6203749 DOI: 10.1038/s41598-018-33960-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 09/26/2018] [Indexed: 12/19/2022] Open
Abstract
Recognition of nucleic acids by endosomal Toll-like receptors (TLR) is essential to combat pathogens, but requires strict control to limit inflammatory responses. The mechanisms governing this tight regulation are unclear. We found that single-stranded oligonucleotides (ssON) inhibit endocytic pathways used by cargo destined for TLR3/4/7 signaling endosomes. Both ssDNA and ssRNA conferred the endocytic inhibition, it was concentration dependent, and required a certain ssON length. The ssON-mediated inhibition modulated signaling downstream of TLRs that localized within the affected endosomal pathway. We further show that injection of ssON dampens dsRNA-mediated inflammatory responses in the skin of non-human primates. These studies reveal a regulatory role for extracellular ssON in the endocytic uptake of TLR ligands and provide a mechanistic explanation of their immunomodulation. The identified ssON-mediated interference of endocytosis (SOMIE) is a regulatory process that temporarily dampens TLR3/4/7 signaling, thereby averting excessive immune responses.
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Affiliation(s)
- Peter Järver
- Department of Molecular Biosciences, Wenner-Gren Institute, Stockholm University, 106 91, Stockholm, Sweden.
| | - Aleksandra Dondalska
- Department of Molecular Biosciences, Wenner-Gren Institute, Stockholm University, 106 91, Stockholm, Sweden
| | - Candice Poux
- Department of Molecular Biosciences, Wenner-Gren Institute, Stockholm University, 106 91, Stockholm, Sweden
| | - AnnSofi Sandberg
- Cancer Proteomics Mass Spectrometry, Department of Oncology-Pathology, Science for Life Laboratory, Karolinska Institutet, 171 65, Stockholm, Sweden
| | - Joseph Bergenstråhle
- Department of Gene Technology, Science for Life Laboratory, Royal Institute of Technology, 171 65, Solna, Sweden
| | - Annette E Sköld
- Department of Molecular Biosciences, Wenner-Gren Institute, Stockholm University, 106 91, Stockholm, Sweden
| | - Nathalie Dereuddre-Bosquet
- CEA, -Université Paris Sud-Inserm U1184, IDMIT Department, Institut de Biologie Francois Jacob (IBFJ), 922 60, Fontenay-aux-Roses, France
| | - Fréderic Martinon
- CEA, -Université Paris Sud-Inserm U1184, IDMIT Department, Institut de Biologie Francois Jacob (IBFJ), 922 60, Fontenay-aux-Roses, France
| | - Sandra Pålsson
- Department of Molecular Biosciences, Wenner-Gren Institute, Stockholm University, 106 91, Stockholm, Sweden
| | - Eman Zaghloul
- Clinical Research Center, Department of Laboratory Medicine, Karolinska Institutet, 141 86, Stockholm, Sweden
| | - David Brodin
- Bioinformatics and Expression Analysis core facility, Department of Biosciences and Nutrition, Karolinska Institutet, 141 83, Stockholm, Sweden
| | - Birgitta Sander
- Division of Pathology, Department of Laboratory Medicine, Karolinska Institutet, 141 86, Stockholm, Sweden
| | - Kim A Lennox
- Integrated DNA Technologies Inc, Coralville, 52241, Iowa, USA
| | - Mark A Behlke
- Integrated DNA Technologies Inc, Coralville, 52241, Iowa, USA
| | - Samir El-Andaloussi
- Clinical Research Center, Department of Laboratory Medicine, Karolinska Institutet, 141 86, Stockholm, Sweden.,Department of Physiology, Anatomy and Genetics, University of Oxford, OX1 3PT, Oxford, UK
| | - Janne Lehtiö
- Cancer Proteomics Mass Spectrometry, Department of Oncology-Pathology, Science for Life Laboratory, Karolinska Institutet, 171 65, Stockholm, Sweden
| | - Joakim Lundeberg
- Department of Gene Technology, Science for Life Laboratory, Royal Institute of Technology, 171 65, Solna, Sweden
| | - Roger LeGrand
- CEA, -Université Paris Sud-Inserm U1184, IDMIT Department, Institut de Biologie Francois Jacob (IBFJ), 922 60, Fontenay-aux-Roses, France
| | - Anna-Lena Spetz
- Department of Molecular Biosciences, Wenner-Gren Institute, Stockholm University, 106 91, Stockholm, Sweden.
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192
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Zakeri A, Hansen EP, Andersen SD, Williams AR, Nejsum P. Immunomodulation by Helminths: Intracellular Pathways and Extracellular Vesicles. Front Immunol 2018; 9:2349. [PMID: 30369927 PMCID: PMC6194161 DOI: 10.3389/fimmu.2018.02349] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2018] [Accepted: 09/21/2018] [Indexed: 12/13/2022] Open
Abstract
Helminth parasites are masters at manipulating host immune responses, using an array of sophisticated mechanisms. One of the major mechanisms enabling helminths to establish chronic infections is the targeting of pattern recognition receptors (PRRs) including toll-like receptors, C-type lectin receptors, and the inflammasome. Given the critical role of these receptors and their intracellular pathways in regulating innate inflammatory responses, and also directing adaptive immunity toward Th1 and Th2 responses, recognition of the pathways triggered and/or modulated by helminths and their products will provide detailed insights about how helminths are able to establish an immunoregulatory environment. However, helminths also target PRRs-independent mechanisms (and most likely other yet unknown mechanisms and pathways) underpinning the battery of different molecules helminths produce. Herein, the current knowledge on intracellular pathways in antigen presenting cells activated by helminth-derived biomolecules is reviewed. Furthermore, we discuss the importance of helminth-derived vesicles as a less-appreciated components released during infection, their role in activating these host intracellular pathways, and their implication in the development of new therapeutic approaches for inflammatory diseases and the possibility of designing a new generation of vaccines.
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Affiliation(s)
- Amin Zakeri
- Department of Clinical Medicine, Faculty of Health, Aarhus University, Aarhus, Denmark
| | - Eline P. Hansen
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Sidsel D. Andersen
- Department of Clinical Medicine, Faculty of Health, Aarhus University, Aarhus, Denmark
| | - Andrew R. Williams
- Department of Veterinary and Animal Sciences, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg, Denmark
| | - Peter Nejsum
- Department of Clinical Medicine, Faculty of Health, Aarhus University, Aarhus, Denmark
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193
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Righetti RF, Dos Santos TM, Camargo LDN, Aristóteles LRCRB, Fukuzaki S, de Souza FCR, Santana FPR, de Agrela MVR, Cruz MM, Alonso-Vale MIC, Genaro IS, Saraiva-Romanholo BM, Leick EA, Martins MDA, Prado CM, Tibério IDFLC. Protective Effects of Anti-IL17 on Acute Lung Injury Induced by LPS in Mice. Front Pharmacol 2018; 9:1021. [PMID: 30337870 PMCID: PMC6180195 DOI: 10.3389/fphar.2018.01021] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 08/23/2018] [Indexed: 12/20/2022] Open
Abstract
Introduction: T helper 17 (Th17) has been implicated in a variety of inflammatory lung and immune system diseases. However, little is known about the expression and biological role of IL-17 in acute lung injury (ALI). We investigated the mechanisms involved in the effect of anti-IL17 in a model of lipopolysaccharide (LPS)-induced acute lung injury (ALI) in mice. Methods: Mice were pre-treated with anti-IL17, 1h before saline/LPS intratracheal administration alongside non-treated controls and levels of exhaled nitric oxide (eNO), cytokine expression, extracellular matrix remodeling and oxidative stress, as well as immune cell counts in bronchoalveolar lavage fluid (BALF), and respiratory mechanics were assessed in lung tissue. Results: LPS instillation led to an increase in multiple cytokines, proteases, nuclear factor-κB, and Forkhead box P3 (FOXP3), eNO and regulators of the actomyosin cytoskeleton, the number of CD4+ and iNOS-positive cells as well as the number of neutrophils and macrophages in BALF, resistance and elastance of the respiratory system, ARG-1 gene expression, collagen fibers, and actin and 8-iso-PGF2α volume fractions. Pre-treatment with anti-IL17 led to a significant reduction in the level of all assessed factors. Conclusions: Anti-IL17 can protect the lungs from the inflammatory effects of LPS-induced ALI, primarily mediated by the reduced expression of cytokines and oxidative stress. This suggests that further studies using anti-IL17 in a treatment regime would be highly worthwhile.
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Affiliation(s)
- Renato Fraga Righetti
- Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, Brazil.,Hospital Sírio-Libanês, São Paulo, Brazil
| | - Tabata Maruyama Dos Santos
- Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, Brazil.,Hospital Sírio-Libanês, São Paulo, Brazil
| | | | | | - Silvia Fukuzaki
- Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, Brazil
| | | | | | | | - Maysa Mariana Cruz
- Universidade Federal de São Paulo, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Departamento de Ciências Biológicas, Diadema, São Paulo, Brazil
| | - Maria Isabel Cardoso Alonso-Vale
- Universidade Federal de São Paulo, Instituto de Ciências Ambientais, Químicas e Farmacêuticas, Departamento de Ciências Biológicas, Diadema, São Paulo, Brazil
| | - Isabella Santos Genaro
- Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, Brazil.,Public Employee of São Paulo Hospital (IAMSPE), São Paulo, Brazil
| | | | | | | | - Carla Máximo Prado
- Department of Bioscience, Federal University of São Paulo, Santos, São Paulo, Brazil
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194
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Glushkova OV, Parfenyuk SB, Novoselova TV, Khrenov MO, Lunin SM, Novoselova EG. The Role of p38 and CK2 Protein Kinases in the Response of RAW 264.7 Macrophages to Lipopolysaccharide. BIOCHEMISTRY (MOSCOW) 2018; 83:746-754. [PMID: 30195331 DOI: 10.1134/s0006297918060123] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The role of protein kinases p38 and CK2 (casein kinase II) in the response of RAW 264.7 macrophages to the lipopolysaccharide (LPS) from gram-negative bacteria was studied. Using specific p38 and CK2 inhibitors (p38 MAP kinase Inhibitor XI and casein kinase II Inhibitor III, respectively), we investigated the effects of these protein kinases on (i) LPS-induced activation of signaling pathways involving nuclear factor κB (NF-κB), stress-activated protein kinase/c-Jun N-terminal kinase (SAPK/JNK), p38, and interferon regulatory factor 3 (IRF3); (ii) expression of Toll-like receptor 4 (TLR4) and inducible heat-shock proteins HSP72 and HSP90; and (iii) production of interleukins IL-1α, IL-1β, IL-6, tumor necrosis factor α, and IL-10. Activation of the proapoptotic signaling in the macrophages was evaluated from the ratio between the active and inactive caspase-3 forms and p53 phosphorylation. Six hours after LPS addition (2.5 μg/ml) to RAW 264.7 cells, activation of the TLR4 signaling pathways was observed that was accompanied by a significant increase in phosphorylation of IκB kinase α/β, NF-κB (at both Ser536 and Ser276), p38, JNK, and IRF3. Other effects of macrophage incubation with LPS were an increase in the contents of TLR4, inducible heat-shock proteins (HSPs), and pro- and anti-inflammatory cytokines, as well as slight activation of the pro-apoptotic signaling in the cells. Using inhibitor analysis, we found that during the early response of macrophages to the LPS, both CK2 and p38 modulate activation of MAP kinase and NF-κB signaling pathways and p65 phosphorylation at Ser276/Ser536 and cause accumulation of HSP72, HSP90 and the LPS-recognizing receptor TLR4. Suppression of the p38 MAP kinase and CK2 activities by specific inhibitors (Inhibitor XI and Inhibitor III, respectively) resulted in the impairment of the macrophage effector function manifested as a decrease in the production of the early-response proinflammatory cytokines and disbalance between the pro- and anti-apoptotic signaling pathways leading presumably to apoptosis development. Taken together, our data indicate the inefficiency of therapeutic application of p38 and CK2 inhibitors during the early stages of inflammatory response.
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Affiliation(s)
- O V Glushkova
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia.
| | - S B Parfenyuk
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
| | - T V Novoselova
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
| | - M O Khrenov
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
| | - S M Lunin
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
| | - E G Novoselova
- Institute of Cell Biophysics, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
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Schweikl H, Gallorini M, Pöschl G, Urmann V, Petzel C, Bolay C, Hiller KA, Cataldi A, Buchalla W. Functions of transcription factors NF-κB and Nrf2 in the inhibition of LPS-stimulated cytokine release by the resin monomer HEMA. Dent Mater 2018; 34:1661-1678. [PMID: 30196988 DOI: 10.1016/j.dental.2018.08.292] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2018] [Revised: 08/22/2018] [Accepted: 08/27/2018] [Indexed: 12/28/2022]
Abstract
OBJECTIVE Resin monomers like 2-hydroxyethyl methacrylate (HEMA) interfere with effects induced by stressors such as lipopolysaccharide (LPS) released from cariogenic microorganisms. In this study, mechanisms underlying monomer-induced inhibition of the LPS-stimulated secretion of inflammatory cytokines from immunocompetent cells were investigated. METHODS Secretion of pro-inflammatory cytokines TNF-α, IL-6 and the anti-inflammatory IL-10 from RAW264.7 mouse macrophages exposed to LPS and HEMA (0-6-8mM) was determined by ELISA. The formation of reactive oxygen (ROS) and nitrogen species (RNS) was determined by flow cytometry (FACS) after staining of cells with specific fluorescent dyes. Cell viability was analyzed by FACS, and protein expression was detected by Western blotting. RESULTS Secretion of TNF-α, IL-6 and IL-10 from LPS-stimulated cells increased after a 24h exposure. A HEMA-induced decrease in cytokine secretion resulted from the inhibition of LPS-stimulated NF-κB activation. Nuclear translocation of NF-κB was inhibited possibly as a result of enhanced levels of hydrogen peroxide (H2O2) and nitric oxide (NO) in HEMA-exposed cells. Oxidative stress caused by HEMA-induced formation of H2O2 and LPS-stimulated peroxynitrite (ONOO) also enhanced nuclear expression of Nrf2 as the major regulator of redox homeostasis, as well as Nrf2-controlled stress protein HO-1 to inhibit NF-κB activity. HEMA inhibited the LPS-stimulated expression of NOS (nitric oxide synthase) to produce NO but counteracted the expression of Nox2, which forms superoxide anions that combine with NO to peroxynitrite. CONCLUSIONS Resin monomers like HEMA inhibit LPS-stimulated NF-κB activation essential for cytokine release as a crucial response of immunocompetent cells of the dental pulp to invading cariogenic pathogens.
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Affiliation(s)
- Helmut Schweikl
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, University of Regensburg, D-93042 Regensburg, Germany.
| | - Marialucia Gallorini
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, University of Regensburg, D-93042 Regensburg, Germany; Department of Pharmacy, University "G. d'Annunzio" Chieti-Pescara, Via dei Vestini 31, 66100 Chieti, Italy
| | - Gerd Pöschl
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, University of Regensburg, D-93042 Regensburg, Germany
| | - Vera Urmann
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, University of Regensburg, D-93042 Regensburg, Germany
| | - Christine Petzel
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, University of Regensburg, D-93042 Regensburg, Germany
| | - Carola Bolay
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, University of Regensburg, D-93042 Regensburg, Germany
| | - Karl-Anton Hiller
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, University of Regensburg, D-93042 Regensburg, Germany
| | - Amelia Cataldi
- Department of Pharmacy, University "G. d'Annunzio" Chieti-Pescara, Via dei Vestini 31, 66100 Chieti, Italy
| | - Wolfgang Buchalla
- Department of Conservative Dentistry and Periodontology, University Hospital Regensburg, University of Regensburg, D-93042 Regensburg, Germany
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196
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Early TLR4 Blockade Attenuates Sterile Inflammation-mediated Stress in Islets During Isolation and Promotes Successful Transplant Outcomes. Transplantation 2018; 102:1505-1513. [DOI: 10.1097/tp.0000000000002287] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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197
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Hepatic Rac1 GTPase contributes to liver-mediated basal immune homeostasis and LPS-induced endotoxemia. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2018; 1865:1277-1292. [DOI: 10.1016/j.bbamcr.2018.06.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 05/30/2018] [Accepted: 06/17/2018] [Indexed: 12/16/2022]
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198
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Chanzyme TRPM7 Mediates the Ca 2+ Influx Essential for Lipopolysaccharide-Induced Toll-Like Receptor 4 Endocytosis and Macrophage Activation. Immunity 2018; 48:59-74.e5. [PMID: 29343440 DOI: 10.1016/j.immuni.2017.11.026] [Citation(s) in RCA: 166] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 09/08/2017] [Accepted: 11/29/2017] [Indexed: 02/07/2023]
Abstract
Toll-like receptors (TLRs) sense pathogen-associated molecular patterns to activate the production of inflammatory mediators. TLR4 recognizes lipopolysaccharide (LPS) and drives the secretion of inflammatory cytokines, often contributing to sepsis. We report that transient receptor potential melastatin-like 7 (TRPM7), a non-selective but Ca2+-conducting ion channel, mediates the cytosolic Ca2+ elevations essential for LPS-induced macrophage activation. LPS triggered TRPM7-dependent Ca2+ elevations essential for TLR4 endocytosis and the subsequent activation of the transcription factor IRF3. In a parallel pathway, the Ca2+ signaling initiated by TRPM7 was also essential for the nuclear translocation of NFκB. Consequently, TRPM7-deficient macrophages exhibited major deficits in the LPS-induced transcriptional programs in that they failed to produce IL-1β and other key pro-inflammatory cytokines. In accord with these defects, mice with myeloid-specific deletion of Trpm7 are protected from LPS-induced peritonitis. Our study highlights the importance of Ca2+ signaling in macrophage activation and identifies the ion channel TRPM7 as a central component of TLR4 signaling.
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199
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Chen S, Yang D, Wen Y, Jiang Z, Zhang L, Jiang J, Chen Y, Hu T, Wang Q, Zhang Y, Liu Q. Dysregulated hemolysin liberates bacterial outer membrane vesicles for cytosolic lipopolysaccharide sensing. PLoS Pathog 2018; 14:e1007240. [PMID: 30138458 PMCID: PMC6124777 DOI: 10.1371/journal.ppat.1007240] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 09/05/2018] [Accepted: 07/25/2018] [Indexed: 01/22/2023] Open
Abstract
Inflammatory caspase-11/4/5 recognize cytosolic LPS from invading Gram-negative bacteria and induce pyroptosis and cytokine release, forming rapid innate antibacterial defenses. Since extracellular or vacuole-constrained bacteria are thought to rarely access the cytoplasm, how their LPS are exposed to the cytosolic sensors is a critical event for pathogen recognition. Hemolysin is a pore-forming bacterial toxin, which was generally accepted to rupture cell membrane, leading to cell lysis. Whether and how hemolysin participates in non-canonical inflammasome signaling remains undiscovered. Here, we show that hemolysin-overexpressed enterobacteria triggered significantly increased caspase-4 activation in human intestinal epithelial cell lines. Hemolysin promoted LPS cytosolic delivery from extracellular bacteria through dynamin-dependent endocytosis. Further, we revealed that hemolysin was largely associated with bacterial outer membrane vesicles (OMVs) and induced rupture of OMV-containing vacuoles, subsequently increasing LPS exposure to the cytosolic sensor. Accordingly, overexpression of hemolysin promoted caspase-11 dependent IL-18 secretion and gut inflammation in mice, which was associated with restricting bacterial colonization in vivo. Together, our work reveals a concept that hemolysin promotes noncanonical inflammasome activation via liberating OMVs for cytosolic LPS sensing, which offers insights into innate immune surveillance of dysregulated hemolysin via caspase-11/4 in intestinal antibacterial defenses. Sensing of lipopolysaccharide (LPS) in the cytosol triggers non-canonical inflammasome-mediated innate responses. Recent work revealed that bacterial outer membrane vesicles (OMVs) enables LPS to access the cytosol for extracellular bacteria. However, since intracellular OMVs are generally constrained in endosomes, how OMV-derived LPS gain access to the cytosol remains unknown. Here, we reported that hemolysin largely bound with OMVs and entered cells through dynamin-dependent endocytosis. Intracellular hemolysin significantly impaired OMVs-constrained vacuole integrity and increased OMV-derived LPS exposure to the cytosolic sensor, which promoted non-canonical inflammasome activation and restricted bacterial gut infections. This work reveals that dysregulated hemolysin promotes non-canonical inflammasome activation and alerts host immune recognition, providing insights into the more sophisticated biological functions of hemolysin upon infection.
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Affiliation(s)
- Shouwen Chen
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Dahai Yang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
- Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, China
| | - Ying Wen
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Zhiwei Jiang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Lingzhi Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
- Department of Pathology and Comprehensive Cancer Center, University of Michigan, Ann Arbor, Michigan, United States of America
| | - Jiatiao Jiang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Yaozhen Chen
- Department of Transfusion Medicine, Xijing hospital, Xi’an, China
| | - Tianjian Hu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
| | - Qiyao Wang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
- Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, China
| | - Yuanxing Zhang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
- Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, China
| | - Qin Liu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, China
- Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, China
- Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
- * E-mail:
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Abstract
After LPS recognition, the MyD88-dependent and the TRIF-dependent pathways are consecutively activated in macrophages. Schappe et al. (2018) show that the chanzyme TRPM7 is required for an efficient LPS receptor complex endosomal relocation and the activation of the TRIF pathway.
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Affiliation(s)
- Francesca Granucci
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy.
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