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Jin CJ, Engstler AJ, Ziegenhardt D, Bischoff SC, Trautwein C, Bergheim I. Loss of lipopolysaccharide-binding protein attenuates the development of diet-induced non-alcoholic fatty liver disease in mice. J Gastroenterol Hepatol 2017; 32:708-715. [PMID: 27404046 DOI: 10.1111/jgh.13488] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/04/2016] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND AIM It has been suggested in several studies that an increased translocation of bacterial lipopolysaccharide (LPS) and, subsequently, an activation of toll-like receptor (TLR)-dependent signaling pathways in the liver may contribute to the development of non-alcoholic fatty liver disease. METHODS Eight-week-old lipopolysaccharide-binding protein (LBP)-/- and wild-type (WT) mice were pair fed either a liquid diet rich in fat, fructose, and cholesterol (Western-style diet [WSD]) or a control liquid diet for 8 weeks. Parameters of liver injury, markers of TLR-4-dependent signaling pathway, and glucose/lipid metabolism were determined. RESULTS Despite similar total caloric intake, weight gain, fasting blood glucose levels, and liver-to-bodyweight ratio, indices of liver damage determined by liver histology and transaminases were markedly lower in WSD-fed LBP-/- mice than in WSD-fed WT animals. In line with these findings, number of neutrophils, F4/80 positive cells, and plasminogen activator inhibitor 1 were only found to be significantly increased in livers of WSD-fed WT mice. While mRNA expressions of TLR-4 and myeloid differentiation primary response 88 were similar between WSD-fed groups, concentrations of inducible nitric oxide synthase protein and 4-hydroxynonenal protein adducts were significantly higher in livers of WSD-fed WT mice than in WSD-fed LBP-/- animals. Markers of lipid metabolism, for example, sterol regulatory element-binding protein 1c and fatty acid synthase per se, were significantly lower in livers of LBP-/- mice; however, mRNA expressions did not differ between controls and WSD-fed mice within the respective mouse strain. CONCLUSION Taken together, our results suggest that LBP is a critical factor in the development of non-alcoholic fatty liver disease in mice.
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Affiliation(s)
- Cheng Jun Jin
- Institute of Nutritional Sciences, SD Model Systems of Molecular Nutrition, Friedrich-Schiller-University Jena, Jena, Germany
| | - Anna Janina Engstler
- Institute of Nutritional Sciences, SD Model Systems of Molecular Nutrition, Friedrich-Schiller-University Jena, Jena, Germany
| | - Doreen Ziegenhardt
- Institute of Nutritional Sciences, SD Model Systems of Molecular Nutrition, Friedrich-Schiller-University Jena, Jena, Germany
| | - Stephan C Bischoff
- Department of Nutritional Medicine, University of Hohenheim, Stuttgart, Germany
| | - Christian Trautwein
- Department of Gastroenterology, Metabolic Diseases and Internal Intensive Medicine (Med. Clinic III), University Hospital RWTH Aachen, Aachen, Germany
| | - Ina Bergheim
- Institute of Nutritional Sciences, SD Model Systems of Molecular Nutrition, Friedrich-Schiller-University Jena, Jena, Germany
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Liu H, Cheng WL, Jiang X, Wang PX, Fang C, Zhu XY, Huang Z, She ZG, Li H. Ablation of Interferon Regulatory Factor 3 Protects Against Atherosclerosis in Apolipoprotein E-Deficient Mice. Hypertension 2017; 69:510-520. [PMID: 28115514 DOI: 10.1161/hypertensionaha.116.08395] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 09/12/2016] [Accepted: 12/08/2016] [Indexed: 01/13/2023]
Abstract
The secretion of adhesion molecules by endothelial cells, as well as the subsequent infiltration of macrophages, determines the initiation and progression of atherosclerosis. Accumulating evidence suggests that IRF3 (interferon regulatory factor 3) is required for the induction of proinflammatory cytokines and for endothelial cell proliferation. However, the effect and underlying mechanism of IRF3 on atherogenesis remain unknown. Our results demonstrated a moderate-to-strong immunoreactivity effect associated with IRF3 in the endothelium and macrophages of the atherosclerotic plaques in patients with coronary heart disease and in hyperlipidemic mice. IRF3-/-ApoE-/- mice showed significantly decreased atherosclerotic lesions in the whole aorta, aortic sinus, and brachiocephalic arteries. The bone marrow transplantation further suggested that the amelioration of atherosclerosis might be attributed to the effects of IRF3 deficiency mainly in endothelial cells, as well as in macrophages. The enhanced stability of atherosclerotic plaques in IRF3-/-ApoE-/- mice was characterized by the reduction of necrotic core size, macrophage infiltration, and lipids, which was accompanied by increased collagen and smooth muscle cell content. Furthermore, multiple proinflammatory cytokines showed a marked decrease in IRF3-/-ApoE-/- mice. Mechanistically, IRF3 deficiency suppresses the secretion of VCAM-1 (vascular cell adhesion molecule 1) and the expression of ICAM-1 (intercellular adhesion molecule 1) by directly binding to the ICAM-1 promoter, which subsequently attenuates macrophage infiltration. Thus, our study suggests that IRF3 might be a potential target for the treatment of atherosclerosis development.
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Affiliation(s)
- Hui Liu
- From the Department of Cardiology, Renmin Hospital of Wuhan University, China (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li); and The Institute of Model Animals (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Medical Research Institute, School of Medicine (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Collaborative Innovation Center of Model Animal (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Cardiovascular Research Institute (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), and College of Life Science (Z.H.), Wuhan University, China
| | - Wen-Lin Cheng
- From the Department of Cardiology, Renmin Hospital of Wuhan University, China (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li); and The Institute of Model Animals (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Medical Research Institute, School of Medicine (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Collaborative Innovation Center of Model Animal (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Cardiovascular Research Institute (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), and College of Life Science (Z.H.), Wuhan University, China
| | - Xi Jiang
- From the Department of Cardiology, Renmin Hospital of Wuhan University, China (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li); and The Institute of Model Animals (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Medical Research Institute, School of Medicine (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Collaborative Innovation Center of Model Animal (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Cardiovascular Research Institute (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), and College of Life Science (Z.H.), Wuhan University, China
| | - Pi-Xiao Wang
- From the Department of Cardiology, Renmin Hospital of Wuhan University, China (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li); and The Institute of Model Animals (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Medical Research Institute, School of Medicine (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Collaborative Innovation Center of Model Animal (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Cardiovascular Research Institute (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), and College of Life Science (Z.H.), Wuhan University, China
| | - Chun Fang
- From the Department of Cardiology, Renmin Hospital of Wuhan University, China (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li); and The Institute of Model Animals (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Medical Research Institute, School of Medicine (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Collaborative Innovation Center of Model Animal (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Cardiovascular Research Institute (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), and College of Life Science (Z.H.), Wuhan University, China
| | - Xue-Yong Zhu
- From the Department of Cardiology, Renmin Hospital of Wuhan University, China (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li); and The Institute of Model Animals (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Medical Research Institute, School of Medicine (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Collaborative Innovation Center of Model Animal (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Cardiovascular Research Institute (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), and College of Life Science (Z.H.), Wuhan University, China
| | - Zan Huang
- From the Department of Cardiology, Renmin Hospital of Wuhan University, China (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li); and The Institute of Model Animals (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Medical Research Institute, School of Medicine (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Collaborative Innovation Center of Model Animal (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Cardiovascular Research Institute (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), and College of Life Science (Z.H.), Wuhan University, China
| | - Zhi-Gang She
- From the Department of Cardiology, Renmin Hospital of Wuhan University, China (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li); and The Institute of Model Animals (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Medical Research Institute, School of Medicine (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Collaborative Innovation Center of Model Animal (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Cardiovascular Research Institute (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), and College of Life Science (Z.H.), Wuhan University, China
| | - Hongliang Li
- From the Department of Cardiology, Renmin Hospital of Wuhan University, China (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li); and The Institute of Model Animals (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Medical Research Institute, School of Medicine (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Collaborative Innovation Center of Model Animal (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), Cardiovascular Research Institute (H. Liu, W.-L.C., X.J., P.-X.W., C.F., X.-Y.Z., Z.-G.S., H. Li), and College of Life Science (Z.H.), Wuhan University, China.
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Wallace CJK, Milev R. The effects of probiotics on depressive symptoms in humans: a systematic review. Ann Gen Psychiatry 2017; 16:14. [PMID: 28239408 PMCID: PMC5319175 DOI: 10.1186/s12991-017-0138-2] [Citation(s) in RCA: 231] [Impact Index Per Article: 33.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/29/2016] [Accepted: 02/16/2017] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Patients suffering from depression experience significant mood, anxiety, and cognitive symptoms. Currently, most antidepressants work by altering neurotransmitter activity in the brain to improve these symptoms. However, in the last decade, research has revealed an extensive bidirectional communication network between the gastrointestinal tract and the central nervous system, referred to as the "gut-brain axis." Advances in this field have linked psychiatric disorders to changes in the microbiome, making it a potential target for novel antidepressant treatments. The aim of this review is to analyze the current body of research assessing the effects of probiotics, on symptoms of depression in humans. METHODS A systematic search of five databases was performed and study selection was completed using the preferred reporting items for systematic reviews and meta-analyses process. RESULTS Ten studies met criteria and were analyzed for effects on mood, anxiety, and cognition. Five studies assessed mood symptoms, seven studies assessed anxiety symptoms, and three studies assessed cognition. The majority of the studies found positive results on all measures of depressive symptoms; however, the strain of probiotic, the dosing, and duration of treatment varied widely and no studies assessed sleep. CONCLUSION The evidence for probiotics alleviating depressive symptoms is compelling but additional double-blind randomized control trials in clinical populations are warranted to further assess efficacy.
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Affiliation(s)
- Caroline J K Wallace
- Department of Psychiatry, Queen's University, 752 King Street West, Kingston, ON K7L 4X3 Canada
| | - Roumen Milev
- Department of Psychiatry, Queen's University, 752 King Street West, Kingston, ON K7L 4X3 Canada
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154
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Glial and Neuroimmune Mechanisms as Critical Modulators of Drug Use and Abuse. Neuropsychopharmacology 2017; 42:156-177. [PMID: 27402494 PMCID: PMC5143481 DOI: 10.1038/npp.2016.121] [Citation(s) in RCA: 173] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/01/2016] [Revised: 06/24/2016] [Accepted: 06/28/2016] [Indexed: 12/26/2022]
Abstract
Drugs of abuse cause persistent alterations in synaptic plasticity that may underlie addiction behaviors. Evidence suggests glial cells have an essential and underappreciated role in the development and maintenance of drug abuse by influencing neuronal and synaptic functions in multifaceted ways. Microglia and astrocytes perform critical functions in synapse formation and refinement in the developing brain, and there is growing evidence that disruptions in glial function may be implicated in numerous neurological disorders throughout the lifespan. Linking evidence of function in health and under pathological conditions, this review will outline the glial and neuroimmune mechanisms that may contribute to drug-abuse liability, exploring evidence from opioids, alcohol, and psychostimulants. Drugs of abuse can activate microglia and astrocytes through signaling at innate immune receptors, which in turn influence neuronal function not only through secretion of soluble factors (eg, cytokines and chemokines) but also potentially through direct remodeling of the synapses. In sum, this review will argue that neural-glial interactions represent an important avenue for advancing our understanding of substance abuse disorders.
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155
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Castiglione F, Tieri P, Palma A, Jarrah AS. Statistical ensemble of gene regulatory networks of macrophage differentiation. BMC Bioinformatics 2016; 17:506. [PMID: 28155642 PMCID: PMC5260144 DOI: 10.1186/s12859-016-1363-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Macrophages cover a major role in the immune system, being the most plastic cell yielding several key immune functions. METHODS Here we derived a minimalistic gene regulatory network model for the differentiation of macrophages into the two phenotypes M1 (pro-) and M2 (anti-inflammatory). RESULTS To test the model, we simulated a large number of such networks as in a statistical ensemble. In other words, to enable the inter-cellular crosstalk required to obtain an immune activation in which the macrophage plays its role, the simulated networks are not taken in isolation but combined with other cellular agents, thus setting up a discrete minimalistic model of the immune system at the microscopic/intracellular (i.e., genetic regulation) and mesoscopic/intercellular scale. CONCLUSIONS We show that within the mesoscopic level description of cellular interaction and cooperation, the gene regulatory logic is coherent and contributes to the overall dynamics of the ensembles that shows, statistically, the expected behaviour.
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Affiliation(s)
- Filippo Castiglione
- Institute for Applied Computing, National Research Council of Italy, Via dei Taurini 19, Rome, 00185 Italy
| | - Paolo Tieri
- Institute for Applied Computing, National Research Council of Italy, Via dei Taurini 19, Rome, 00185 Italy
| | - Alessandro Palma
- Department of Biology, University of Tor Vergata, Via della ricerca scientifica 1, Rome, 00133 Italy
| | - Abdul Salam Jarrah
- Department of Mathematics and Statistics, American University of Sharjah, P.O.Box 26666, Sharjah, UAE
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156
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Beta Interferon Production Is Regulated by p38 Mitogen-Activated Protein Kinase in Macrophages via both MSK1/2- and Tristetraprolin-Dependent Pathways. Mol Cell Biol 2016; 37:MCB.00454-16. [PMID: 27795299 PMCID: PMC5192081 DOI: 10.1128/mcb.00454-16] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Accepted: 10/07/2016] [Indexed: 01/03/2023] Open
Abstract
Autocrine or paracrine signaling by beta interferon (IFN-β) is essential for many of the responses of macrophages to pathogen-associated molecular patterns. This feedback loop contributes to pathological responses to infectious agents and is therefore tightly regulated. We demonstrate here that macrophage expression of IFN-β is negatively regulated by mitogen- and stress-activated kinases 1 and 2 (MSK1/2). Lipopolysaccharide (LPS)-induced expression of IFN-β was elevated in both MSK1/2 knockout mice and macrophages. Although MSK1 and -2 promote the expression of the anti-inflammatory cytokine interleukin 10, it did not strongly contribute to the ability of MSKs to regulate IFN-β expression. Instead, MSK1 and -2 inhibit IFN-β expression via the induction of dual-specificity phosphatase 1 (DUSP1), which dephosphorylates and inactivates the mitogen-activated protein kinases p38 and Jun N-terminal protein kinase (JNK). Prolonged LPS-induced activation of p38 and JNK, phosphorylation of downstream transcription factors, and overexpression of IFN-β mRNA and protein were similar in MSK1/2 and DUSP1 knockout macrophages. Two distinct mechanisms were implicated in the overexpression of IFN-β: first, JNK-mediated activation of c-jun, which binds to the IFN-β promoter, and second, p38-mediated inactivation of the mRNA-destabilizing factor tristetraprolin, which we show is able to target the IFN-β mRNA.
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157
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Ren Y, Zhou BQ, Xu Y, Fu CC, Shen HJ, Ding ZX, Wu DP. [The clinical features of patients with lymphoplasmacytic diseases harboring MyD88 L265P mutation]. ZHONGHUA XUE YE XUE ZA ZHI = ZHONGHUA XUEYEXUE ZAZHI 2016; 37:1054-1059. [PMID: 28088969 PMCID: PMC7348489 DOI: 10.3760/cma.j.issn.0253-2727.2016.12.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Indexed: 12/03/2022]
Abstract
Objective: To explore the clinical features of lymphoplasmacytic diseases with MyD88 L265P mutation. Methods: To analyze the distribution of MYD88 L265P mutation in patients with lymphoplasmacytic diseases by using of ARMS PCR-CE. Results: There were 25(30.9%) MyD88 L265P mutated patients in 81 patients. The mutation was frequently observed in 14 patients with WM (77.8%, 14/18), 2 patients with lymphoplasmacytic lymphoma (66.7%, 2/3), 1 acute lymphocytic leukemia patient (50.0%, 1/2), 3 multiple myeloma patients (30.0%, 3/10), 1 patient with monoclonal gammopathy of undetermined significance (25%, 1/4), 3 patients with chronic lymphocytic leukemia (13.0%, 3/23) and 1 lymphoma patient (4.8%, 1/21). 20 (80%, 20/25) patients were identified with IgM subtype. Compared with wild-type group of 56 cases, mutated patients were older (median age: 67 years vs 55 years, P< 0.001), with lower WBC count (median count: 5.23 × 109/L vs 10.80 × 109/L, P=0.001), lower HGB level (median count: 85 g/L vs 119 g/L, P<0.001). Conclusion: MyD88 L265P mutation was mainly observed in patients with IgM subtype lymphoplasmacytic diseases, and Waldenstrom' s macroglobulinemia was the most common disease. Compared with the wild-type group, patients with MyD88 L265P mutation were older and had lower WBC count, lower level of HGB. However, further studies were needed to test the prognostic value of MyD88 L265P mutation.
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Affiliation(s)
- Y Ren
- First Affiliated Hospital of Soochow University, Jiangsu Institute of Hematology, Key Laboratory of Thrombosis and Hemostasis under Ministry of Health, Collaborative Innovation Center of Hematology, Institute of Blood and Marrow Transplantation, Soochow University, Suzhou 215006, China
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158
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Teng YTA. Protective and Destructive Immunity in the Periodontium: Part 2—T-cell-mediated Immunity in the Periodontium. J Dent Res 2016; 85:209-19. [PMID: 16498066 DOI: 10.1177/154405910608500302] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Based on the results of recent research in the field and Part 1 of this article (in this issue), the present paper will discuss the protective and destructive aspects of the T-cell-mediated adaptive immunity associated with the bacterial virulent factors or antigenic determinants during periodontal pathogenesis. Attention will be focused on: (i) osteoimmunology and periodontal disease; (ii) some molecular techniques developed and applied to identify critical microbial virulence factors or antigens associated with host immunity (with Actinobacillus actinomycetemcomitans and Porphyromonas gingivalis as the model species); and (iii) summarizing the identified virulence factors/antigens associated with periodontal immunity. Thus, further understanding of the molecular mechanisms of the host’s T-cell-mediated immune responses and the critical microbial antigens related to disease pathogenesis will facilitate the development of novel therapeutics or protocols for future periodontal treatments. Abbreviations used in the paper are as follows: A. actinomycetemcomitans ( Aa), Actinobacillus actinomycetemcomitans; Ab, antibody; DC, dendritic cells; mAb, monoclonal antibody; pAb, polyclonal antibody; OC, osteoclast; PAMP, pathogen-associated molecular patterns; P. gingivalis ( Pg), Porphyromonas gingivalis; RANK, receptor activator of NF-κB; RANKL, receptor activator of NF-κB ligand; OPG, osteoprotegerin; TCR, T-cell-receptors; TLR, Toll-like receptors.
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Affiliation(s)
- Y-T A Teng
- Laboratory of Molecular Microbial Immunity, Eastman Department of Dentistry, Eastman Dental Center, Box-683, 625 Elmwood Ave., Rochester, NY 14620, USA.
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159
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Rothschild DE, Zhang Y, Diao N, Lee CK, Chen K, Caswell CC, Slade DJ, Helm RF, LeRoith T, Li L, Allen IC. Enhanced Mucosal Defense and Reduced Tumor Burden in Mice with the Compromised Negative Regulator IRAK-M. EBioMedicine 2016; 15:36-47. [PMID: 27939424 PMCID: PMC5233813 DOI: 10.1016/j.ebiom.2016.11.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 11/30/2016] [Accepted: 11/30/2016] [Indexed: 12/27/2022] Open
Abstract
Aberrant inflammation is a hallmark of inflammatory bowel disease (IBD) and colorectal cancer. IRAK-M is a critical negative regulator of TLR signaling and overzealous inflammation. Here we utilize data from human studies and Irak-m-/- mice to elucidate the role of IRAK-M in the modulation of gastrointestinal immune system homeostasis. In human patients, IRAK-M expression is up-regulated during IBD and colorectal cancer. Further functional studies in mice revealed that Irak-m-/- animals are protected against colitis and colitis associated tumorigenesis. Mechanistically, our data revealed that the gastrointestinal immune system of Irak-m-/- mice is highly efficient at eliminating microbial translocation following epithelial barrier damage. This attenuation of pathogenesis is associated with expanded areas of gastrointestinal associated lymphoid tissue (GALT), increased neutrophil migration, and enhanced T-cell recruitment. Further evaluation of Irak-m-/- mice revealed a splice variant that robustly activates NF-κB signaling. Together, these data identify IRAK-M as a potential target for future therapeutic intervention.
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Affiliation(s)
- Daniel E Rothschild
- Department of Biomedical Sciences and Pathobiology, VA-MD College of Veterinary Medicine, Blacksburg, Virginia 24061, United States
| | - Yao Zhang
- Department of Biological Sciences, Virginia Polytechnic and State University, Blacksburg, Virginia 24061, United States
| | - Na Diao
- Department of Biological Sciences, Virginia Polytechnic and State University, Blacksburg, Virginia 24061, United States
| | - Christina K Lee
- Department of Biological Sciences, Virginia Polytechnic and State University, Blacksburg, Virginia 24061, United States
| | - Keqiang Chen
- Department of Biological Sciences, Virginia Polytechnic and State University, Blacksburg, Virginia 24061, United States
| | - Clayton C Caswell
- Department of Biomedical Sciences and Pathobiology, VA-MD College of Veterinary Medicine, Blacksburg, Virginia 24061, United States
| | - Daniel J Slade
- Department of Biochemistry, Virginia Polytechnic and State University, Blacksburg, Virginia 24061, United States
| | - Richard F Helm
- Department of Biochemistry, Virginia Polytechnic and State University, Blacksburg, Virginia 24061, United States
| | - Tanya LeRoith
- Department of Biomedical Sciences and Pathobiology, VA-MD College of Veterinary Medicine, Blacksburg, Virginia 24061, United States
| | - Liwu Li
- Department of Biological Sciences, Virginia Polytechnic and State University, Blacksburg, Virginia 24061, United States.
| | - Irving C Allen
- Department of Biomedical Sciences and Pathobiology, VA-MD College of Veterinary Medicine, Blacksburg, Virginia 24061, United States.
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Sun L, Pham TT, Cornell TT, McDonough KL, McHugh WM, Blatt NB, Dahmer MK, Shanley TP. Myeloid-Specific Gene Deletion of Protein Phosphatase 2A Magnifies MyD88- and TRIF-Dependent Inflammation following Endotoxin Challenge. THE JOURNAL OF IMMUNOLOGY 2016; 198:404-416. [PMID: 27872207 DOI: 10.4049/jimmunol.1600221] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 10/21/2016] [Indexed: 12/23/2022]
Abstract
Protein phosphatase 2A (PP2A) is a member of the intracellular serine/threonine phosphatases. Innate immune cell activation triggered by pathogen-associated molecular patterns is mediated by various protein kinases, and PP2A plays a counter-regulatory role by deactivating these kinases. In this study, we generated a conditional knockout of the α isoform of the catalytic subunit of PP2A (PP2ACα). After crossing with myeloid-specific cre-expressing mice, effective gene knockout was achieved in various myeloid cells. The myeloid-specific knockout mice (lyM-PP2Afl/fl) showed higher mortality in response to endotoxin challenge and bacterial infection. Upon LPS challenge, serum levels of TNF-α, KC, IL-6, and IL-10 were significantly increased in lyM-PP2Afl/fl mice, and increased phosphorylation was observed in MAPK pathways (p38, ERK, JNK) and the NF-κB pathway (IKKα/β, NF-κB p65) in bone marrow-derived macrophages (BMDMs) from knockout mice. Heightened NF-κB activation was not associated with degradation of IκBα; instead, enhanced phosphorylation of the NF-κB p65 subunit and p38 phosphorylation-mediated TNF-α mRNA stabilization appear to contribute to the increased TNF-α expression. In addition, increased IL-10 expression appears to be due to PP2ACα-knockout-induced IKKα/β hyperactivation. Microarray experiments indicated that the Toll/IL-1R domain-containing adaptor inducing IFN-β/ TNFR-associated factor 3 pathway was highly upregulated in LPS-treated PP2ACα-knockout BMDMs, and knockout BMDMs had elevated IFN-α/β production compared with control BMDMs. Serum IFN-β levels from PP2ACα-knockout mice treated with LPS were also greater than those in controls. Thus, we demonstrate that PP2A plays an important role in regulating inflammation and survival in the setting of septic insult by targeting MyD88- and Toll/IL-1R domain-containing adaptor inducing IFN-β-dependent pathways.
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Affiliation(s)
- Lei Sun
- Division of Critical Care Medicine, Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109;
| | - Tiffany T Pham
- Division of Critical Care Medicine, Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109
| | - Timothy T Cornell
- Division of Critical Care Medicine, Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109
| | - Kelli L McDonough
- Division of Critical Care Medicine, Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109
| | - Walker M McHugh
- Division of Critical Care Medicine, Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109
| | - Neal B Blatt
- Division of Pediatric Nephrology, Department of Pediatrics and Communicable Diseases, C.S. Mott Children's Hospital, University of Michigan Medical School, Ann Arbor, MI 48109; and
| | - Mary K Dahmer
- Division of Critical Care Medicine, Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109
| | - Thomas P Shanley
- Department of Pediatrics, Lurie Children's Hospital of Chicago, Feinberg School of Medicine, Northwestern University, Evanston, IL 60611
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161
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Zhang ZH, Liu XQ, Zhang C, He W, Wang H, Chen YH, Liu XJ, Chen X, Xu DX. Tlr4-mutant mice are resistant to acute alcohol-induced sterol-regulatory element binding protein activation and hepatic lipid accumulation. Sci Rep 2016; 6:33513. [PMID: 27627966 PMCID: PMC5024165 DOI: 10.1038/srep33513] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Accepted: 08/30/2016] [Indexed: 12/20/2022] Open
Abstract
Previous studies demonstrated that acute alcohol intoxication caused hepatic lipid accumulation. The present study showed that acute alcohol intoxication caused hepatic lipid accumulation in Tlr4-wild-type mice but not in Tlr4-mutant mice. Hepatic sterol-regulatory element binding protein (SREBP)-1, a transcription factor regulating fatty acid and triglyceride (TG) synthesis, was activated in alcohol-treated Tlr4-wild-type mice but not in Tlr4-mutant mice. Hepatic Fas, Acc, Scd-1 and Dgat-2, the key genes for fatty acid and TG synthesis, were up-regulated in alcohol-treated Tlr4-wild-type mice but not in Tlr4-mutant mice. Additional experiment showed that hepatic MyD88 was elevated in alcohol-treated Tlr4-wild-type mice but not in Tlr4-mutant mice. Hepatic NF-κB was activated in alcohol-treated Tlr4-wild-type mice but not in Tlr4-mutant mice. Moreover, hepatic GSH content was reduced and hepatic MDA level was elevated in alcohol-treated Tlr4-wild-type mice but not in Tlr4-mutant mice. Hepatic CYP2E1 was elevated in alcohol-treated Tlr4-wild-type mice but not in Tlr4-mutant mice. Hepatic p67phox and gp91phox, two NADPH oxidase subunits, were up-regulated in alcohol-treated Tlr4-wild-type mice but not in Tlr4-mutant mice. Alpha-phenyl-N-t-butylnitrone (PBN), a free radical spin-trapping agent, protected against alcohol-induced hepatic SREBP-1 activation and hepatic lipid accumulation. In conclusion, Tlr4-mutant mice are resistant to acute alcohol-induced hepatic SREBP-1 activation and hepatic lipid accumulation.
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Affiliation(s)
- Zhi-Hui Zhang
- Department of Toxicology, Anhui Medical University, Hefei, 230032, China
| | - Xiao-Qian Liu
- Department of Toxicology, Anhui Medical University, Hefei, 230032, China
| | - Cheng Zhang
- Department of Toxicology, Anhui Medical University, Hefei, 230032, China
| | - Wei He
- First Affiliated Hospital, Anhui Medical University, Hefei, 230032, China
| | - Hua Wang
- Department of Toxicology, Anhui Medical University, Hefei, 230032, China
| | - Yuan-Hua Chen
- Department of Toxicology, Anhui Medical University, Hefei, 230032, China
| | - Xiao-Jing Liu
- First Affiliated Hospital, Anhui Medical University, Hefei, 230032, China
| | - Xi Chen
- First Affiliated Hospital, Anhui Medical University, Hefei, 230032, China
| | - De-Xiang Xu
- Department of Toxicology, Anhui Medical University, Hefei, 230032, China
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162
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Takeda K. Evolution and integration of innate immune recognition systems: the Toll-like receptors. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519050110011101] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Toll-like receptors (TLRs) recognize specific components of micro-organisms and trigger the activation of innate immunity. TLR-mediated signaling pathways are now rapidly being elucidated. TLR signaling originates from the cytoplasmic Toll/IL-1 receptor (TIR) domain, which is conserved among all TLRs. Furthermore, TIR domain-containing adaptors, such as MyD88, TRIF, TIRAP and TRAM, play essential roles in TLR signaling. MyD88 is essential for inflammatory cytokine production via all TLRs, whereas TRIF is involved in TLR3- and TLR4-mediated MyD88-independent induction of IFN-β. Thus, innate immunity represents a skilful system that senses microbial invasion and initiates appropriate immune responses.
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Affiliation(s)
- Kiyoshi Takeda
- Department of Molecular Genetics, Medical Institute of Bioregulation, Kyushu University, Fukuoka, Japan, -u.ac.jp
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163
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Medvedev AE, Sabroe I, Hasday JD, Vogel SN. Invited review: Tolerance to microbial TLR ligands: molecular mechanisms and relevance to disease. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519060120030201] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Many host cell types, including endothelial and epithelial cells, neutrophils, monocytes, natural killer cells, dendritic cells and macrophages, initiate the first line of defense against infection by sensing conserved microbial structures through Toll-like receptors (TLRs). Recognition of microbial ligands by TLRs induces their oligomerization and triggers intracellular signaling pathways, leading to production of pro- and anti-inflammatory cytokines. Dysregulation of the fine molecular mechanisms that tightly control TLR signaling may lead to hyperactivation of host cells by microbial products and septic shock. A prior exposure to bacterial products such as lipopolysaccharide (LPS) may result in a transient state of refractoriness to subsequent challenge that has been referred to as `tolerance'. Tolerance has been postulated as a protective mechanism limiting excessive inflammation and preventing septic shock. However, tolerance may compromise the host's ability to counteract subsequent bacterial challenge since many septic patients exhibit an increased incidence of recurrent bacterial infection and suppressed monocyte responsiveness to LPS, closely resembling the tolerant phenotype. Thus, by studying mechanisms of microbial tolerance, we may gain insights into how normal regulatory mechanisms are dysregulated, leading ultimately to microbial hyporesponsivess and life-threatening disease. In this review, we present current theories of the molecular mechanisms that underlie induction and maintenance of `microbial tolerance', and discuss the possible relevance of tolerance to several infectious and non-infectious diseases.
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Affiliation(s)
- Andrei E. Medvedev
- Department of Microbiology and Immunology, University of Maryland, Baltimore (UMB), Baltimore, Maryland, USA,
| | - Ian Sabroe
- Academic Unit of Respiratory Medicine, Division of Genomic Medicine, University of Sheffield, Royal Hallamshire Hospital, Sheffield, UK
| | - Jeffrey D. Hasday
- Department of Medicine, University of Maryland, Baltimore (UMB), Baltimore, Maryland, USA
| | - Stefanie N. Vogel
- Department of Microbiology and Immunology, University of Maryland, Baltimore (UMB), Baltimore, Maryland, USA
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164
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Abstract
Toll-like receptors (TLRs) are essential for the recognition of distinct pathogen-associated molecular patterns (PAMPs). Activation of TLRs induces intracellular signaling pathways which lead to the production of pro-inflammatory cytokines, chemokines, and interferon (IFN)-inducible genes. TIR domain containing adaptor molecules in turn determine the signaling specificity of the response. Recent studies demonstrated that serine/threonine kinases IKK-i/TBK1 are critical for the regulation of IFN-β as well as IFN-inducible genes. In response to lipopolysaccharide (LPS), transfection of poly(I:C) and viral infection, embryonic fibroblasts (MEFs) derived from TBK1-deficient ( TBK1— /—) mice show impaired production of IFN-inducible genes, but not pro-inflammatory cytokines. Although IKK-i— /— mice show normal production of these genes, MEFs from IKK-i/ TBK1-doubly deficient mice were completely defective in the induction of IFN-β as well as IFN-inducible genes in response to poly(I:C) stimulation. Activation of IFN-regulatory factor (IRF) 3 in response to LPS and poly(I:C) was abolished in IKK-i/TBK1 doubly deficient cells. Interestingly, intracellular transduction of poly(I:C) initiates activation of IFN response in a TLR3-independent manner. These observations demonstrate that IKK-i/TBK1 signaling is essential for both TLR3-dependent and TLR3-independent viral and dsRNA-induced IFN responses.
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Affiliation(s)
- Osamu Takeuchi
- Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan, ERATO, Japan Science and Technology Agency, Osaka, Japan
| | - Hiroaki Hemmi
- Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan
| | - Shizuo Akira
- Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, Osaka, Japan, ERATO, Japan Science and Technology Agency, Osaka, Japan, -u.ac.jp
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165
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Durbin J, Doughty L, Nguyen K, Caligiuri M, Van Deusen J, Biron C. The role of STAT1 in viral sensitization to LPS. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519030090050701] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The phenomenon of endotoxin sensitization by virus infection is well documented but not yet well understood. Infection by virtually any viral agent will quickly induce expression of type I interferons (IFN-α/β), and type II IFN-γ production will follow as NK cells and T cells are activated. It has been well established that type II IFN pretreatment can intensify the effects of endotoxin. We have recently demonstrated that type I IFN induction by lymphocytic choriomeningitis virus (LCMV) infection dramatically increases TNF-α production following LPS treatment, and that this sensitization by type I IFN is STAT1 dependent. Taken together these data suggest that the STAT1-mediated, MyD88-independent, arm of the LPS signaling pathway plays an important role in endotoxin toxicity, and that this pathway mediates a major component of virus-enhanced LPS sensitization.
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Affiliation(s)
- Joan Durbin
- Department of Pediatrics, Columbus Children's Research Institute, The Ohio State University Columbus, Ohio, USA, -state.edu
| | - Leslie Doughty
- Department of Pediatrics, Rhode Island Hospital, Brown University School of Medicine, Providence, Rhode Island, USA
| | - Ken Nguyen
- Department of Microbiology and Immunology, Division of Biology and Medicine, Brown University, Providence, Rhode Island, USA
| | - Michael Caligiuri
- Department of Internal Medicine, Division of Hematology Oncology, The Ohio State University, Columbus, Ohio, USA
| | - Jeff Van Deusen
- Department of Internal Medicine, Division of Hematology Oncology, The Ohio State University, Columbus, Ohio, USA
| | - Christine Biron
- Department of Microbiology and Immunology, Division of Biology and Medicine, Brown University, Providence, Rhode Island, USA
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166
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O'Neill LA, Dunne A, Edjeback M, Gray P, Jefferies C, Wietek C. Mal and MyD88: adapter proteins involved in signal transduction by Toll-like receptors. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519030090010701] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Signal transduction processes activated by Toll-like receptors (TLRs) include the important transcription factor NF-κB and 2 MAP kinases, p38 and Jun N-terminal kinase. These signals ultimately give rise to increased expression of a multitude of pro-inflammatory proteins. Receptor-proximal proteins involved in signalling by all TLRs include the adapter MyD88, 3 IRAKs (IRAK-4, IRAK and IRAK-2), Tollip, Traf-6 and TAK-1. Differences between signals generated by TLRs are emerging, with both TLR4 and TLR2 signalling requiring an additional adapter termed MyD88-adapter-like (Mal; also known as TIRAP). MyD88 and Mal both have a homologous Toll/IL-1 receptor (TIR) domain although they differ in their N-termini, with MyD88 possessing a death domain. In addition, structural models reveal marked differences in surface charges which, when taken with surface charge differences between TLR2 and TLR4 TIR domains, may indicate that TLR4 but not TLR2 recruits Mal directly. Another difference is that Mal can become phosphorylated. Future studies on Mal will reveal specificities in signal transduction by different TLRs, which may ultimately provide molecular explanations for specificities in the innate immune response to infection.
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Affiliation(s)
- Luke A.J. O'Neill
- Department of Biochemistry, Trinity College Dublin, Dublin, Ireland,
| | - Aisling Dunne
- Department of Biochemistry, Trinity College Dublin, Dublin, Ireland
| | - Michael Edjeback
- Department of Biochemistry, Trinity College Dublin, Dublin, Ireland
| | - Pearl Gray
- Department of Biochemistry, Trinity College Dublin, Dublin, Ireland
| | | | - Claudia Wietek
- Department of Biochemistry, Trinity College Dublin, Dublin, Ireland
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167
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Toshchakov V, Jones BW, Lentschat A, Silva A, Perera PY, Thomas K, Cody MJ, Shuling Zhang, Williams BR, Major J, Hamilton TA, Fenton MJ, Vogel SN. TLR2 and TLR4 agonists stimulate unique repertoires of host resistance genes in murine macrophages: interferon-β-dependent signaling in TLR4-mediated responses. ACTA ACUST UNITED AC 2016. [DOI: 10.1177/09680519030090030501] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
That TLRs share a common MyD88-dependent signaling pathway which results in the generation of nuclear DNA-binding proteins, such as NF-κB, is a well-accepted paradigm. However, studies from our laboratories and others suggested that TLR4 agonists elicit a more diverse pattern of gene expression in murine macrophages than TLR2 agonists. The data presented show that activation of TLR4 by Escherichia coli LPS results in an MyD88-independent, TIRAP/Mal-dependent signaling pathway that, in turn, leads to early induction of interferon-β (IFN-β). IFN-β , in turn, acts in an autocrine/paracrine fashion on the macrophage to activate STAT1-containing DNA binding complexes that participate in the induction of genes not expressed in response to natural or synthetic TLR2 agonists. These data support the hypothesis that the host response to microbes is controlled by TLRs at two levels: (i) the `sensing' of differences in microbial structures through the TLR extracellular domain; and (ii) signaling pathways that are initiated via interactions through unique intracytoplasmic regions of different TLRs with adaptor proteins.
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Affiliation(s)
- Vladimir Toshchakov
- Department of Microbiology and Immunology, University of Maryland, Baltimore, Maryland, USA
| | - Bryan W. Jones
- The Pulmonary Center, Boston University Medical School, Boston, Massachusetts, USA
| | - Arnd Lentschat
- Department of Microbiology and Immunology, University of Maryland, Baltimore, Maryland, USA
| | | | - Pin-Yu Perera
- Department of Microbiology and Immunology, University of Maryland, Baltimore, Maryland, USA
| | - Karen Thomas
- Department of Microbiology and Immunology, University of Maryland, Baltimore, Maryland, USA
| | - M. Joshua Cody
- Department of Microbiology and Immunology, University of Maryland, Baltimore, Maryland, USA
| | - Shuling Zhang
- Department of Microbiology and Immunology, University of Maryland, Baltimore, Maryland, USA
| | | | | | | | - Matthew J. Fenton
- The Pulmonary Center, Boston University Medical School, Boston, Massachusetts, USA
| | - Stefanie N. Vogel
- Department of Microbiology and Immunology, University of Maryland, Baltimore, Maryland, USA,
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168
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Michel V, Duan Y, Stoschek E, Bhushan S, Middendorff R, Young JM, Loveland KL, Kretser DMD, Hedger MP, Meinhardt A. UropathogenicEscherichia colicauses fibrotic remodelling of the epididymis. J Pathol 2016; 240:15-24. [DOI: 10.1002/path.4748] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Revised: 04/28/2016] [Accepted: 05/20/2016] [Indexed: 01/26/2023]
Affiliation(s)
- Vera Michel
- Institute of Anatomy and Cell Biology; Justus-Liebig-University Giessen; Germany
| | - Yonggang Duan
- Centre of Reproductive Medicine and Andrology, First Affiliated Hospital of Shenzhen University; Shenzhen Second People's Hospital; People's Republic of China
| | - Elke Stoschek
- Institute of Anatomy and Cell Biology; Justus-Liebig-University Giessen; Germany
| | - Sudhanshu Bhushan
- Institute of Anatomy and Cell Biology; Justus-Liebig-University Giessen; Germany
| | - Ralf Middendorff
- Institute of Anatomy and Cell Biology; Justus-Liebig-University Giessen; Germany
| | - Julia M Young
- Hudson Institute of Medical Research; Melbourne Victoria Australia
| | - Kate L Loveland
- Department of Molecular and Translational Sciences; Monash University; Melbourne Victoria Australia
- Department of Anatomy and Developmental Biology; Monash University; Melbourne Victoria Australia
- Department of Biochemistry and Molecular Biology; Monash University; Melbourne Victoria Australia
| | - David M De Kretser
- Department of Anatomy and Developmental Biology; Monash University; Melbourne Victoria Australia
- Hudson Institute of Medical Research; Melbourne Victoria Australia
| | - Mark P Hedger
- Department of Anatomy and Developmental Biology; Monash University; Melbourne Victoria Australia
- Hudson Institute of Medical Research; Melbourne Victoria Australia
| | - Andreas Meinhardt
- Institute of Anatomy and Cell Biology; Justus-Liebig-University Giessen; Germany
- Department of Molecular and Translational Sciences; Monash University; Melbourne Victoria Australia
- Hudson Institute of Medical Research; Melbourne Victoria Australia
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169
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Han JW, Shim DW, Shin WY, Kim MK, Shim EJ, Sun X, Koppula S, Kim TJ, Kang TB, Lee KH. Juniperus rigida Sieb. extract inhibits inflammatory responses via attenuation of TRIF-dependent signaling and inflammasome activation. JOURNAL OF ETHNOPHARMACOLOGY 2016; 190:91-99. [PMID: 27260408 DOI: 10.1016/j.jep.2016.05.059] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Revised: 04/19/2016] [Accepted: 05/29/2016] [Indexed: 06/05/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Juniperus rigida Sieb. (J. rigida) is used for medicinal purposes in Asian countries to treat inflammation-related disorders, such as neuralgia, dropsy, and gout. AIM OF THE STUDY The anti-inflammatory effects of J. rigida extract (JR) and its underlying mechanisms were explored both in in vitro cell lines and in vivo metabolic disease models. MATERIAL AND METHODS Lipopolysaccharide (LPS)-stimulated RAW264.7 murine macrophages were used to study the changes in inflammatory responses in vitro. Bone marrow-derived macrophages (BMDMs) were used to study the regulatory effect of JR on inflammasome activation. The murine model for monosodium urate (MSU)-induced peritonitis and high-fat diet (HFD)-induced type 2 diabetes were employed to study the effect of JR on in vivo efficacy. RESULTS JR suppressed the MSU-induced in vivo inflammatory response by attenuation of proinflammatory cytokines, including interleukin (IL)-1β, IL-6, and tumor necrosis factor-alpha (TNF-α). In the in vitro study, JR suppressed IL-1β secretion via regulation of apoptosis-associated speck-like protein containing a CARD (ASC) oligomerization, leading to the inhibition of inflammasome activation. JR also inhibited the LPS-stimulated release of proinflammatory mediators, such as nitric oxide (NO), TNF-α, and IL-6 in RAW264.7 cells. The inhibitory effects of JR were mediated through the regulation of the TRIF-dependent signaling pathway from JAK1/STAT1 phosphorylation. Furthermore, JR showed inhibitory effects on HFD-induced type 2 diabetes in a mouse model through the regulation of blood glucose and serum IL-1β. CONCLUSIONS Our results indicate that JR attenuates both LPS-stimulated and danger-signal-induced inflammatory responses in macrophages via regulation of the key inflammatory mechanisms, providing scientific support for its traditional use in the treatment of various inflammation-related metabolic disorders.
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MESH Headings
- Adaptor Proteins, Vesicular Transport/metabolism
- Animals
- Anti-Inflammatory Agents/isolation & purification
- Anti-Inflammatory Agents/pharmacology
- Apoptosis Regulatory Proteins/metabolism
- Blood Glucose/drug effects
- Blood Glucose/metabolism
- CARD Signaling Adaptor Proteins
- Chromatography, High Pressure Liquid
- Cytokines/metabolism
- Diabetes Mellitus, Experimental/immunology
- Diabetes Mellitus, Experimental/metabolism
- Diabetes Mellitus, Experimental/prevention & control
- Diabetes Mellitus, Type 2/immunology
- Diabetes Mellitus, Type 2/metabolism
- Diabetes Mellitus, Type 2/prevention & control
- Diet, High-Fat
- Dose-Response Relationship, Drug
- Female
- Hypoglycemic Agents/isolation & purification
- Hypoglycemic Agents/pharmacology
- Inflammasomes/drug effects
- Inflammasomes/immunology
- Inflammasomes/metabolism
- Inflammation/immunology
- Inflammation/metabolism
- Inflammation/prevention & control
- Inflammation Mediators/metabolism
- Janus Kinase 1/metabolism
- Juniperus/chemistry
- Lipopolysaccharides/pharmacology
- Macrophages/drug effects
- Macrophages/immunology
- Macrophages/metabolism
- Mice
- Mice, Inbred C57BL
- NLR Family, Pyrin Domain-Containing 3 Protein/metabolism
- Peritonitis/chemically induced
- Peritonitis/immunology
- Peritonitis/metabolism
- Peritonitis/prevention & control
- Phosphorylation
- Phytotherapy
- Plant Extracts/isolation & purification
- Plant Extracts/pharmacology
- Plants, Medicinal
- RAW 264.7 Cells
- STAT1 Transcription Factor/metabolism
- Signal Transduction/drug effects
- Uric Acid
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Affiliation(s)
- Ji-Won Han
- Department of Biotechnology, College of Biomedical & Health Science, Research Institute of Inflammatory Diseases, Konkuk University, Chungju, South Korea
| | - Do-Wan Shim
- Department of Biotechnology, College of Biomedical & Health Science, Research Institute of Inflammatory Diseases, Konkuk University, Chungju, South Korea
| | - Woo-Young Shin
- Department of Biotechnology, College of Biomedical & Health Science, Research Institute of Inflammatory Diseases, Konkuk University, Chungju, South Korea
| | - Myong-Ki Kim
- Department of Food Science and Engineering, Seowon University, Cheongju, South Korea
| | - Eun-Jeong Shim
- Department of Biotechnology, College of Biomedical & Health Science, Research Institute of Inflammatory Diseases, Konkuk University, Chungju, South Korea
| | - Xiao Sun
- Department of Biotechnology, College of Biomedical & Health Science, Research Institute of Inflammatory Diseases, Konkuk University, Chungju, South Korea
| | - Sushruta Koppula
- Department of Biotechnology, College of Biomedical & Health Science, Research Institute of Inflammatory Diseases, Konkuk University, Chungju, South Korea
| | - Tack-Joong Kim
- Division of Biological Science and Technology, Institute of Biomaterials, Yonsei University, Wonju, South Korea
| | - Tae-Bong Kang
- Department of Biotechnology, College of Biomedical & Health Science, Research Institute of Inflammatory Diseases, Konkuk University, Chungju, South Korea
| | - Kwang-Ho Lee
- Department of Biotechnology, College of Biomedical & Health Science, Research Institute of Inflammatory Diseases, Konkuk University, Chungju, South Korea.
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170
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Zhou X, Ramke M, Chintakuntlawar AV, Lee JY, Rajaiya J, Chodosh J. Role of MyD88 in adenovirus keratitis. Immunol Cell Biol 2016; 95:108-116. [PMID: 27528076 PMCID: PMC5791738 DOI: 10.1038/icb.2016.73] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 07/25/2016] [Accepted: 08/09/2016] [Indexed: 12/29/2022]
Abstract
Pattern recognition receptors (PRRs) are critical to the early detection and innate immune responses to pathogens. In particular, the TLR system and its associated adaptor proteins play essential roles in early host responses to infection. Epidemic keratoconjunctivitis, caused by the human adenovirus, is a severe ocular surface infection associated with corneal inflammation (stromal keratitis). We previously showed that adenovirus capsid was a key molecular pattern in adenovirus keratitis, with viral DNA playing a lesser role. We have now investigated the role of the adaptor molecule MyD88 in a mouse model of adenovirus keratitis in which there is no viral replication. In MyD88−/− mice infected with human adenovirus type 37, clinical keratitis was markedly reduced, along with infiltration of CD45+ cells, and expression of inflammatory cytokines. Reduction of inflammatory cytokines was also observed in infected primary human corneal fibroblasts pretreated with a MyD88 inhibitory peptide. Keratitis similar to wild type mice was observed in TLR2, TLR9, and IL-1R knockout mice, but was reduced in TLR2/9 double knockout mice, consistent with synergy of TLR2 and TLR9 in the response to adenovirus infection. MyD88 co-immunoprecipitated with Src kinase in mice corneas and in human corneal fibroblasts infected with adenovirus, and MyD88 inhibitory peptide reduced Src phosphorylation, linking MyD88 activation to inflammatory gene expression through a signaling cascade previously shown to be directed by Src. Our findings reveal a critical role for the PRRs TLR2 and 9, and their adaptor protein MyD88, in corneal inflammation upon adenovirus infection.
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Affiliation(s)
- Xiaohong Zhou
- Howe Laboratory, Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
| | - Mirja Ramke
- Howe Laboratory, Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
| | - Ashish V Chintakuntlawar
- Howe Laboratory, Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
| | - Jeong Yoon Lee
- Howe Laboratory, Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
| | - Jaya Rajaiya
- Howe Laboratory, Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
| | - James Chodosh
- Howe Laboratory, Department of Ophthalmology, Massachusetts Eye and Ear Infirmary, Harvard Medical School, Boston, MA, USA
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171
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Yamane K, Leung KP. Rabbit M1 and M2 macrophages can be induced by human recombinant GM-CSF and M-CSF. FEBS Open Bio 2016; 6:945-53. [PMID: 27642558 PMCID: PMC5011493 DOI: 10.1002/2211-5463.12101] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 07/06/2016] [Accepted: 07/15/2016] [Indexed: 11/11/2022] Open
Abstract
Macrophages can change their phenotype in response to environmental cues. Polarized macrophages are broadly classified into two groups: classical activated M1 and alternative activated M2. Characterization of human macrophages has been widely studied, but polarized macrophages in rabbits have not been characterized. We characterized rabbit macrophages that were polarized using human recombinant GM-CSF and M-CSF. GM-CSF-treated macrophages had higher mRNA expression of proinflammatory cytokines (M1 phenotype) than did the M-CSF-treated counterpart. By contrast, high levels of TGF-β and IL-10 expression (M2 phenotype) were found in M-CSF-treated macrophages. The present study may be useful to understand roles of polarized macrophages in rabbit disease models.
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Affiliation(s)
- Kazuyoshi Yamane
- US Army Dental and Craniofacial Trauma Research and Tissue Regeneration Institute of Surgical Research Fort Sam Houston TX USA; Department of Bacteriology Osaka Dental University Hirakata-shi Osaka Japan
| | - Kai-Poon Leung
- US Army Dental and Craniofacial Trauma Research and Tissue Regeneration Institute of Surgical Research Fort Sam Houston TX USA
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172
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Hussner J, Sünwoldt J, Seibert I, Gliesche DG, Zu Schwabedissen HEM. Pimecrolimus increases the expression of interferon-inducible genes that modulate human coronary artery cells proliferation. Eur J Pharmacol 2016; 784:137-46. [PMID: 27212382 DOI: 10.1016/j.ejphar.2016.05.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Revised: 04/21/2016] [Accepted: 05/18/2016] [Indexed: 10/21/2022]
Abstract
The pharmacodynamics of the loaded compounds defines clinical failure or success of a drug-eluting device. Various limus derivatives have entered clinics due to the observed positive outcome after stent implantation, which is explained by their antiproliferative activity resulting from inhibition of the cytosolic immunophilin FK506-binding protein 12. Although pimecrolimus also binds to this protein, pimecrolimus-eluting stents failed in clinics. However, despite its impact on T lymphocytes little is known about the pharmacodynamics of pimecrolimus in cultured human coronary artery cells. We were able to show that pimecrolimus exerts antiproliferative activity in human smooth muscle and endothelial cells. Furthermore in those cells pimecrolimus induced transcription of interferon-inducible genes which in part are known to modulate cell proliferation. Modulation of gene expression may be part of an interaction between calcineurin, the downstream target of the pimecrolimus/FK506-binding protein 12-complex, and the toll-like receptor 4. In accordance are our findings showing that silencing of toll-like receptor 4 by siRNA in A549 a lung carcinoma cell line reduced the activation of interferon-inducible genes upon pimecrolimus treatment in those cells. Based on our findings we hypothesize that calcineurin inhibition may induce the toll-like receptor 4 mediated activation of type I interferon signaling finally inducing the observed effect in endothelial and smooth muscle cells. The crosstalk of interferon and toll-like receptor signaling may be a molecular mechanism that contributed to the failure of pimecrolimus-eluting stents in humans.
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Affiliation(s)
- Janine Hussner
- Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Juliane Sünwoldt
- Institute of Pharmacology, Center of Drug Absorption and Transport, University Medicine, Ernst Moritz Arndt University Greifswald, Felix-Hausdorff-Strasse 3, 17489 Greifswald, Germany
| | - Isabell Seibert
- Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Daniel G Gliesche
- Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
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173
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Viperin inhibits rabies virus replication via reduced cholesterol and sphingomyelin and is regulated upstream by TLR4. Sci Rep 2016; 6:30529. [PMID: 27456665 PMCID: PMC4960569 DOI: 10.1038/srep30529] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 07/05/2016] [Indexed: 01/06/2023] Open
Abstract
Viperin (virus inhibitory protein, endoplasmic reticulum-associated, IFN-inducible) is an interferon-inducible protein that mediates antiviral activity. Generally, rabies virus (RABV) multiplies extremely well in susceptible cells, leading to high virus titres. In this study, we found that viperin was significantly up-regulated in macrophage RAW264.7 cells but not in NA, BHK-21 or BSR cells. Transient viperin overexpression in BSR cells and stable expression in BHK-21 cells could inhibit RABV replication, including both attenuated and street RABV. Furthermore, the inhibitory function of viperin was related to reduce cholesterol/sphingomyelin on the membranes of RAW264.7 cells. We explored the up-stream regulation pathway of viperin in macrophage RAW264.7 cells in the context of RABV infection. An experiment confirmed that a specific Toll-like receptor 4 (TLR4) inhibitor, TAK-242, could inhibit viperin expression in RABV-infected RAW264.7 cells. These results support a regulatory role for TLR4. Geldanamycin, a specific inhibitor of interferon regulatory factor 3 (IRF3) (by inhibiting heat-shock protein 90 (Hsp90) of the IRF3 phosphorylation chaperone), significantly delayed and reduced viperin expression, indicating that IRF3 is involved in viperin induction in RAW264.7 cells. Taken together, our data support the therapeutic potential for viperin to inhibit RABV replication, which appears to involve upstream regulation by TLR4.
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174
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Sirskyj D, Kumar A, Azizi A. Mechanisms Underlying the Immune Response Generated by an Oral Vibrio cholerae Vaccine. Int J Mol Sci 2016; 17:ijms17071062. [PMID: 27384558 PMCID: PMC4964438 DOI: 10.3390/ijms17071062] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 06/07/2016] [Accepted: 06/28/2016] [Indexed: 12/23/2022] Open
Abstract
Mechanistic details underlying the resulting protective immune response generated by mucosal vaccines remain largely unknown. We investigated the involvement of Toll-like receptor signaling in the induction of humoral immune responses following oral immunization with Dukoral, comparing wild type mice with TLR-2-, TLR-4-, MyD88- and Trif-deficient mice. Although all groups generated similar levels of IgG antibodies, the proliferation of CD4+ T-cells in response to V. cholerae was shown to be mediated via MyD88/TLR signaling, and independently of Trif signaling. The results demonstrate differential requirements for generation of immune responses. These results also suggest that TLR pathways may be modulators of the quality of immune response elicited by the Dukoral vaccine. Determining the critical signaling pathways involved in the induction of immune response to this vaccine would be beneficial, and could contribute to more precisely-designed versions of other oral vaccines in the future.
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Affiliation(s)
- Danylo Sirskyj
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada.
- Children's Hospital of Eastern Ontario (CHEO)-Research Institute, Ottawa, ON K1H 5B2, Canada.
| | - Ashok Kumar
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON K1H 8M5, Canada.
- Children's Hospital of Eastern Ontario (CHEO)-Research Institute, Ottawa, ON K1H 5B2, Canada.
- Department of Pathology and Laboratory Medicine, University of Ottawa, 451 Smyth Rd, Ottawa, ON K1H 8M5, Canada.
| | - Ali Azizi
- Department of Pathology and Laboratory Medicine, University of Ottawa, 451 Smyth Rd, Ottawa, ON K1H 8M5, Canada.
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175
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Legarda D, Justus SJ, Ang RL, Rikhi N, Li W, Moran TM, Zhang J, Mizoguchi E, Zelic M, Kelliher MA, Blander JM, Ting AT. CYLD Proteolysis Protects Macrophages from TNF-Mediated Auto-necroptosis Induced by LPS and Licensed by Type I IFN. Cell Rep 2016; 15:2449-61. [PMID: 27264187 DOI: 10.1016/j.celrep.2016.05.032] [Citation(s) in RCA: 75] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 03/23/2016] [Accepted: 05/05/2016] [Indexed: 01/08/2023] Open
Abstract
Tumor necrosis factor (TNF) induces necroptosis, a RIPK3/MLKL-dependent form of inflammatory cell death. In response to infection by Gram-negative bacteria, multiple receptors on macrophages, including TLR4, TNF, and type I IFN receptors, are concurrently activated, but it is unclear how they crosstalk to regulate necroptosis. We report that TLR4 activates CASPASE-8 to cleave and remove the deubiquitinase cylindromatosis (CYLD) in a TRIF- and RIPK1-dependent manner to disable necroptosis in macrophages. Inhibiting CASPASE-8 leads to CYLD-dependent necroptosis caused by the TNF produced in response to TLR4 ligation. While lipopolysaccharides (LPS)-induced necroptosis was abrogated in Tnf(-/-) macrophages, a soluble TNF antagonist was not able to do so in Tnf(+/+) macrophages, indicating that necroptosis occurs in a cell-autonomous manner. Surprisingly, TNF-mediated auto-necroptosis of macrophages requires type I IFN, which primes the expression of key necroptosis-signaling molecules, including TNFR2 and MLKL. Thus, the TNF necroptosis pathway is regulated by both negative and positive crosstalk.
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Affiliation(s)
- Diana Legarda
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Scott J Justus
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Graduate School of Biological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Rosalind L Ang
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Nimisha Rikhi
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Wenjing Li
- Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Thomas M Moran
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Global Health and Emerging Pathogens Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Jianke Zhang
- Department of Microbiology and Immunology, Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA 19107, USA
| | - Emiko Mizoguchi
- Department of Medicine, Gastrointestinal Unit, Massachusetts General Hospital, Boston, MA 02114, USA; Department of Medicine, Center for the Study of Inflammatory Bowel Disease, Massachusetts General Hospital, Boston, MA 02114, USA
| | - Matija Zelic
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - Michelle A Kelliher
- Department of Molecular, Cell and Cancer Biology, University of Massachusetts Medical School, Worcester, MA 01605, USA
| | - J Magarian Blander
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Graduate School of Biological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Microbiology, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Medicine, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA
| | - Adrian T Ting
- Immunology Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Graduate School of Biological Sciences, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA; Department of Medicine, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY 10029, USA.
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176
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Zhang H, Rodriguez S, Wang L, Wang S, Serezani H, Kapur R, Cardoso AA, Carlesso N. Sepsis Induces Hematopoietic Stem Cell Exhaustion and Myelosuppression through Distinct Contributions of TRIF and MYD88. Stem Cell Reports 2016; 6:940-956. [PMID: 27264973 PMCID: PMC4911503 DOI: 10.1016/j.stemcr.2016.05.002] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Revised: 05/06/2016] [Accepted: 05/08/2016] [Indexed: 12/29/2022] Open
Abstract
Toll-like receptor 4 (TLR4) plays a central role in host responses to bacterial infection, but the precise mechanism(s) by which its downstream signaling components coordinate the bone marrow response to sepsis is poorly understood. Using mice deficient in TLR4 downstream adapters MYD88 or TRIF, we demonstrate that both cell-autonomous and non-cell-autonomous MYD88 activation are major causes of myelosuppression during sepsis, while having a modest impact on hematopoietic stem cell (HSC) functions. In contrast, cell-intrinsic TRIF activation severely compromises HSC self-renewal without directly affecting myeloid cells. Lipopolysaccharide-induced activation of MYD88 or TRIF contributes to cell-cycle activation of HSC and induces rapid and permanent changes in transcriptional programs, as indicated by persistent downregulation of Spi1 and CebpA expression after transplantation. Thus, distinct mechanisms downstream of TLR4 signaling mediate myelosuppression and HSC exhaustion during sepsis through unique effects of MyD88 and TRIF. Activation of TLR4 by LPS causes HSC injury, myelosuppression, and neutropenia LPS-induced MYD88 activation leads to apoptosis and myelosuppression LPS causes HSC damage and exhaustion by TRIF activation HSC retain long-term memory of LPS injury
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Affiliation(s)
- Huajia Zhang
- Department of Medical and Molecular Genetics, School of Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA; Herman B Wells Center for Pediatric Research, School of Medicine, Indiana University School of Medicine, 1044 West Walnut, Indianapolis, IN 46202, USA
| | - Sonia Rodriguez
- Herman B Wells Center for Pediatric Research, School of Medicine, Indiana University School of Medicine, 1044 West Walnut, Indianapolis, IN 46202, USA
| | - Lin Wang
- Herman B Wells Center for Pediatric Research, School of Medicine, Indiana University School of Medicine, 1044 West Walnut, Indianapolis, IN 46202, USA
| | - Soujuan Wang
- Department of Microbiology, School of Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Henrique Serezani
- Department of Microbiology, School of Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Reuben Kapur
- Herman B Wells Center for Pediatric Research, School of Medicine, Indiana University School of Medicine, 1044 West Walnut, Indianapolis, IN 46202, USA
| | - Angelo A Cardoso
- Herman B Wells Center for Pediatric Research, School of Medicine, Indiana University School of Medicine, 1044 West Walnut, Indianapolis, IN 46202, USA
| | - Nadia Carlesso
- Department of Medical and Molecular Genetics, School of Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, USA; Herman B Wells Center for Pediatric Research, School of Medicine, Indiana University School of Medicine, 1044 West Walnut, Indianapolis, IN 46202, USA.
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177
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Greuter T, Shah VH. Hepatic sinusoids in liver injury, inflammation, and fibrosis: new pathophysiological insights. J Gastroenterol 2016; 51:511-9. [PMID: 26939970 DOI: 10.1007/s00535-016-1190-4] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Accepted: 02/16/2016] [Indexed: 02/04/2023]
Abstract
Changes of hepatic sinusoids are crucial in the pathogenesis of liver cirrhosis and portal hypertension. Liver injury leads to distinct morphological abnormalities such as loss of sinusoidal fenestration, vasoconstriction, and angiogenesis as well as molecular changes. Communication between the two key cells in this hepatic microenvironment-hepatic stellate cells (HSC) and sinusoidal endothelial cells (SEC)-has been studied for many years and several canonical pathways have been elucidated, such as decreased eNOS activity or increased PDGF and TGF-β production leading to activation and migration of HSC. In recent studies, alternative pathways of intercellular communication in liver diseases have been described such as cell-derived extracellular vesicles called exosomes, which deliver cell compounds to their target cells. Moreover, such extracellular vesicles may link injury to inflammation in alcoholic hepatitis. While inflammation leading to liver fibrosis has been studied in detail, in some circumstances pathways other than the known canonical inflammatory pathways may contribute to hepatic fibrogenesis. For example, in congestive hepatopathy, sinusoidal dilatation and fibrosis have been shown to be mediated by non-inflammatory mechanisms and associated with sinusoidal thrombi. A recently developed murine model further enables experimental studies of this disease entity. Increasing knowledge about these alternative disease pathways in liver injury, inflammation, and fibrosis may reveal possible target molecules for future therapies. This article builds upon a seminar given at the recent 3rd JSGE International Topic Conference in Sendai, Japan, and reviews the areas outlined above.
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Affiliation(s)
- Thomas Greuter
- Division of Gastroenterology and Hepatology, University Hospital Zurich, Zurich, Switzerland
| | - Vijay H Shah
- Gastroenterology Research Unit, Department of Gastroenterology and Hepatology, Mayo Clinic and Foundation, 200 First St. SW, Rochester, MN, 55905, USA.
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178
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Ahn SI, Kim JS, Shin HM, Kim AY, Gu GJ, Shim HJ, Kim YJ, Koh KO, Mang JY, Kim DY, Youn HS. Suppression of TLRs signaling pathways by 1-[5-methoxy-2-(2-nitrovinyl)phenyl]pyrrolidine. Int Immunopharmacol 2016; 35:193-200. [DOI: 10.1016/j.intimp.2016.03.042] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 03/18/2016] [Accepted: 03/28/2016] [Indexed: 01/09/2023]
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179
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Lai R, Liu H, Jakovlić I, Zhan F, Wei J, Yang P, Wang W. Molecular cloning and expression of toll-like receptor 4 (tlr4) in the blunt snout bream (Megalobrama amblycephala). DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2016; 59:63-76. [PMID: 26802439 DOI: 10.1016/j.dci.2016.01.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Revised: 01/05/2016] [Accepted: 01/19/2016] [Indexed: 06/05/2023]
Abstract
Toll-like receptors (TLRs) play a pivotal role in teleost innate immune system. In this study, Megalobrama amblycephala (ma) tlr4 gene was cloned, its putative polypeptide product characterized, and expression analysed. Matlr4 cDNA is 2862 bp long, with an open reading frame of 2364 bp encoding 787 amino acids. MaTlr4 is a typical TLR protein, including the extracellular part with nine leucine-rich repeat motifs, a transmembrane region and a cytoplasmic Toll/interleukin-1 receptor domain. MaTlr4 has the highest level of identity (94%) and similarity (97%) with the grass carp Tlr4.2 homolog. This was also corroborated by the phylogenetic analysis, which placed MaTlr4 in a cluster with other cyprinid homologs. Matlr4 mRNA was ubiquitously expressed in all examined tissues and during all sampled developmental stages. The observed peak in matlr4 mRNA expression during gastrula and somite stages is in good agreement with its proposed role in the development of the neural system. Temporal expression patterns of matlr4 and maMyD88 mRNAs and proteins were analyzed in liver, spleen, head kidney, trunk kidney and intestine after Aeromonas hydrophila infection. And mRNA expression varied between different time-points. Both MaTlr4 and MaMyD88 protein expressions at 12 hpi were significantly enhanced in head kidney and intestine. These results indicate that matlr4 is involved in the immune response in M. amblycephala, and that it is indeed a functional homologue of tlr4s described in other animal species.
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Affiliation(s)
- Ruifang Lai
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Han Liu
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Ivan Jakovlić
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Fanbin Zhan
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Jin Wei
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Pinhong Yang
- Collaborative Innovation Center for Efficient and Health Production of Fisheries in Hunan Province, Changde, 41500, China.
| | - Weimin Wang
- Key Lab of Agricultural Animal Genetics, Breeding and Reproduction of Ministry of Education, Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China.
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180
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Immunomodulatory Effects of a Bioactive Compound Isolated from Dryopteris crassirhizoma on the Grass Carp Ctenopharyngodon idella. J Immunol Res 2016; 2016:3068913. [PMID: 27294155 PMCID: PMC4884598 DOI: 10.1155/2016/3068913] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 04/26/2016] [Indexed: 11/22/2022] Open
Abstract
In the present study, we investigated effects of compound kaempferol 3-a-L-(4-O-acetyl)rhamnopyranoside-7-a-L-rhamnopyranoside (SA) isolated from Dryopteris crassirhizoma during immune-related gene expression in Ctenopharyngodon idella head kidney macrophages (CIHKM). The expression of immune-related genes (IL-1β, TNF-α, MyD88, and Mx1) were investigated using real-time PCR at 2 h, 8 h, 12 h, and 24 h after incubation with 1, 10, and 50 μg mL−1 of SA. Furthermore, fish were injected intraperitoneally with 100 μL of SA, and immune parameters such as lysozyme activity, complement C3, SOD, phagocytic activity, and IgM level were examined at 1, 2, and 3 weeks after injection. The differential expression of cytokines was observed after exposure to SA. IL-1β genes displayed significant expression at 2 and 8 h after exposure to 1–10 μg mL−1 of SA. SA also induced gene expression of cytokines such as MyD88, Mx1, and TNF-α. Furthermore, enhanced immune parameters in grass carp confirmed the immunomodulatory activity of SA. Interestingly, this compound has no toxic effect on CIHKM cells as tested by MTT assay. In addition, fish immunised with 10 μg mL−1 of SA exhibited maximum resistance against Aeromonas hydrophila infection. These results suggest that SA has the potential to stimulate immune responses in grass carp.
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181
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Ullah MO, Sweet MJ, Mansell A, Kellie S, Kobe B. TRIF-dependent TLR signaling, its functions in host defense and inflammation, and its potential as a therapeutic target. J Leukoc Biol 2016; 100:27-45. [PMID: 27162325 DOI: 10.1189/jlb.2ri1115-531r] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2015] [Accepted: 04/04/2016] [Indexed: 12/16/2022] Open
Abstract
Toll/IL-1R domain-containing adaptor-inducing IFN-β (TRIF)-dependent signaling is required for TLR-mediated production of type-I IFN and several other proinflammatory mediators. Various pathogens target the signaling molecules and transcriptional regulators acting in the TRIF pathway, thus demonstrating the importance of this pathway in host defense. Indeed, the TRIF pathway contributes to control of both viral and bacterial pathogens through promotion of inflammatory mediators and activation of antimicrobial responses. TRIF signaling also has both protective and pathologic roles in several chronic inflammatory disease conditions, as well as an essential function in wound-repair processes. Here, we review our current understanding of the regulatory mechanisms that control TRIF-dependent TLR signaling, the role of the TRIF pathway in different infectious and noninfectious pathologic states, and the potential for manipulating TRIF-dependent TLR signaling for therapeutic benefit.
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Affiliation(s)
- M Obayed Ullah
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia; Institute for Molecular Bioscience, Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, Queensland, Australia
| | - Matthew J Sweet
- Institute for Molecular Bioscience, Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, Queensland, Australia; Institute for Molecular Bioscience, Centre for Inflammation and Disease Research, The University of Queensland, Brisbane, Queensland, Australia; and
| | - Ashley Mansell
- Centre for Innate Immunity and Infectious Diseases, Hudson Institute of Medical Research, Monash University, Melbourne, Victoria, Australia
| | - Stuart Kellie
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia; Institute for Molecular Bioscience, Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, Queensland, Australia
| | - Bostjan Kobe
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, Queensland, Australia; Institute for Molecular Bioscience, Australian Infectious Diseases Research Centre, The University of Queensland, Brisbane, Queensland, Australia;
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182
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Wang Q, Shu Z, Xing N, Xu B, Wang C, Sun G, Sun X, Kuang H. A pure polysaccharide from Ephedra sinica treating on arthritis and inhibiting cytokines expression. Int J Biol Macromol 2016; 86:177-88. [DOI: 10.1016/j.ijbiomac.2016.01.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 01/01/2016] [Accepted: 01/03/2016] [Indexed: 10/22/2022]
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183
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Hirohata Y, Kato A, Oyama M, Kozuka-Hata H, Koyanagi N, Arii J, Kawaguchi Y. Interactome analysis of herpes simplex virus 1 envelope glycoprotein H. Microbiol Immunol 2016; 59:331-7. [PMID: 25808324 DOI: 10.1111/1348-0421.12255] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2015] [Revised: 03/10/2015] [Accepted: 03/17/2015] [Indexed: 12/21/2022]
Abstract
Herpes simplex virus 1 (HSV-1) envelope glycoprotein H (gH) is important for viral entry into cells and nuclear egress of nucleocapsids. To clarify additional novel roles of gH during HSV-1 replication, host cell proteins that interact with gH were screened for by tandem affinity purification coupled with mass spectrometry-based proteomics in 293T cells transiently expressing gH. This screen identified 123 host cell proteins as potential gH interactors. Of these proteins, general control nonderepressive-1 (GCN1), a trans-acting positive effector of GCN2 kinase that regulates phosphorylation of the α subunit of translation initiation factor 2 (eIF2α), was subsequently confirmed to interact with gH in HSV-1-infected cells. eIF2α phosphorylation is known to downregulate protein synthesis, and various viruses have evolved mechanisms to prevent the accumulation of phosphorylated eIF2α in infected cells. Here, it was shown that GCN1 knockdown reduces phosphorylation of eIF2α in HSV-1-infected cells and that the gH-null mutation increases eIF2α in HSV-1-infected cells, whereas gH overexpression in the absence of other HSV-1 proteins reduces eIF2α phosphorylation. These findings suggest that GCN1 can regulate eIF2α phosphorylation in HSV-1-infected cells and that the GCN1-binding viral partner gH is necessary and sufficient to prevent the accumulation of phosphorylated eIF2α. Our database of 123 host cell proteins potentially interacting with gH will be useful for future studies aimed at unveiling further novel functions of gH and the roles of cellular proteins in HSV-1-infected cells.
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Affiliation(s)
- Yoshitaka Hirohata
- Division of Molecular Virology, Department of Microbiology and Immunology.,Department of Infectious Disease Control, International Research Center for Infectious Diseases
| | - Akihisa Kato
- Division of Molecular Virology, Department of Microbiology and Immunology.,Department of Infectious Disease Control, International Research Center for Infectious Diseases
| | - Masaaki Oyama
- Medical Proteomics Laboratory, Institute of Medical Science, University of Tokyo, Minato-ku, Tokyo 108-8639, Japan
| | - Hiroko Kozuka-Hata
- Medical Proteomics Laboratory, Institute of Medical Science, University of Tokyo, Minato-ku, Tokyo 108-8639, Japan
| | - Naoto Koyanagi
- Division of Molecular Virology, Department of Microbiology and Immunology.,Department of Infectious Disease Control, International Research Center for Infectious Diseases
| | - Jun Arii
- Division of Molecular Virology, Department of Microbiology and Immunology.,Department of Infectious Disease Control, International Research Center for Infectious Diseases
| | - Yasushi Kawaguchi
- Division of Molecular Virology, Department of Microbiology and Immunology.,Department of Infectious Disease Control, International Research Center for Infectious Diseases
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184
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Ho CC, Luo YH, Chuang TH, Lin P. Quantum dots induced interferon beta expression via TRIF-dependent signaling pathways by promoting endocytosis of TLR4. Toxicology 2016; 344-346:61-70. [PMID: 26925925 DOI: 10.1016/j.tox.2016.02.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2015] [Revised: 02/22/2016] [Accepted: 02/25/2016] [Indexed: 02/06/2023]
Abstract
Quantum dots (QDs) are nano-sized semiconductors. Previously, intratracheal instillation of QD705s induces persistent inflammation and remodeling in the mouse lung. Expression of interferon beta (IFN-β), involved in tissue remodeling, was induced in the mouse lung. The objective of this study was to understand the mechanism of QD705 induced interferon beta (IFN-β) expression. QD705-COOH and QD705-PEG increased IFN-β and IP-10 mRNA levels during day 1 to 90 post-exposure in mouse lungs. QD705-COOH increased IFN-β expression via Toll/interleukin-1 receptor domain-containing adapter protein (TRIF) dependent Toll-like receptor (TLR) signaling pathways in macrophages RAW264.7. Silencing TRIF expression with siRNA or co-treatment with a TRIF inhibitor tremendously abolished QD705s-induced IFN-β expression. Co-treatment with a TLR4 inhibitor completely prevented IFN-β induction by QD705-COOH. QD705-COOH readily entered cells, and co-treatment with either inhibitors of endocytosis or intracellular TLRs prevented IFN-β induction. Thus, activation of the TRIF dependent TLRs pathway by promoting endocytosis of TLR4 is one of the mechanisms for immunomodulatory effects of nanoparticles.
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Affiliation(s)
- Chia-Chi Ho
- National Institutes of Environmental Health Sciences, National Health Research Institutes, Zhunan, Taiwan, ROC
| | - Yueh-Hsia Luo
- National Institutes of Environmental Health Sciences, National Health Research Institutes, Zhunan, Taiwan, ROC
| | - Tsung-Hsien Chuang
- Immunology Research Center, National Health Research Institutes, Zhunan, Taiwan, ROC
| | - Pinpin Lin
- National Institutes of Environmental Health Sciences, National Health Research Institutes, Zhunan, Taiwan, ROC.
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185
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Tallam A, Perumal TM, Antony PM, Jäger C, Fritz JV, Vallar L, Balling R, del Sol A, Michelucci A. Gene Regulatory Network Inference of Immunoresponsive Gene 1 (IRG1) Identifies Interferon Regulatory Factor 1 (IRF1) as Its Transcriptional Regulator in Mammalian Macrophages. PLoS One 2016; 11:e0149050. [PMID: 26872335 PMCID: PMC4752512 DOI: 10.1371/journal.pone.0149050] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 01/25/2016] [Indexed: 01/28/2023] Open
Abstract
Immunoresponsive gene 1 (IRG1) is one of the highest induced genes in macrophages under pro-inflammatory conditions. Its function has been recently described: it codes for immune-responsive gene 1 protein/cis-aconitic acid decarboxylase (IRG1/CAD), an enzyme catalysing the production of itaconic acid from cis-aconitic acid, a tricarboxylic acid (TCA) cycle intermediate. Itaconic acid possesses specific antimicrobial properties inhibiting isocitrate lyase, the first enzyme of the glyoxylate shunt, an anaplerotic pathway that bypasses the TCA cycle and enables bacteria to survive on limited carbon conditions. To elucidate the mechanisms underlying itaconic acid production through IRG1 induction in macrophages, we examined the transcriptional regulation of IRG1. To this end, we studied IRG1 expression in human immune cells under different inflammatory stimuli, such as TNFα and IFNγ, in addition to lipopolysaccharides. Under these conditions, as previously shown in mouse macrophages, IRG1/CAD accumulates in mitochondria. Furthermore, using literature information and transcription factor prediction models, we re-constructed raw gene regulatory networks (GRNs) for IRG1 in mouse and human macrophages. We further implemented a contextualization algorithm that relies on genome-wide gene expression data to infer putative cell type-specific gene regulatory interactions in mouse and human macrophages, which allowed us to predict potential transcriptional regulators of IRG1. Among the computationally identified regulators, siRNA-mediated gene silencing of interferon regulatory factor 1 (IRF1) in macrophages significantly decreased the expression of IRG1/CAD at the gene and protein level, which correlated with a reduced production of itaconic acid. Using a synergistic approach of both computational and experimental methods, we here shed more light on the transcriptional machinery of IRG1 expression and could pave the way to therapeutic approaches targeting itaconic acid levels.
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Affiliation(s)
- Aravind Tallam
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Thaneer M. Perumal
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Paul M. Antony
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Christian Jäger
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Joëlle V. Fritz
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Laurent Vallar
- Genomics Research Laboratory, Luxembourg Institute of Health, Luxembourg, Luxembourg
| | - Rudi Balling
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Antonio del Sol
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Alessandro Michelucci
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
- NORLUX Neuro-Oncology Laboratory, Luxembourg Institute of Health, Luxembourg, Luxembourg
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186
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Zeuner MT, Patel K, Denecke B, Giebel B, Widera D. Paracrine effects of TLR4-polarised mesenchymal stromal cells are mediated by extracellular vesicles. J Transl Med 2016; 14:34. [PMID: 26838370 PMCID: PMC4735950 DOI: 10.1186/s12967-016-0794-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Accepted: 01/20/2016] [Indexed: 12/17/2022] Open
Abstract
Mesenchymal stromal cells (MSCs) are adult stem cells able to give rise to bone, cartilage and fat cells. In addition, they possess immunomodulatory and immunosuppressive properties that are mainly mediated through secretion of extracellular vesicles (EVs). In a previous issue of Journal of Translational Medicine, Ti and colleagues demonstrated that preconditioning of MSCs with bacterial lipopolysaccharides results in secretion of EVs that can polarise macrophages towards anti-inflammatory M2 phenotype. Moreover, the authors suggest that EVs of lipopolysaccharide (LPS)-treated MSCs are superior to EVs of untreated MSCs concerning their ability to support wound healing. Our commentary critically discusses parallel efforts of other laboratories to generate conditioned media from stem cells for therapeutic applications, and highlights impact and significance of the study of Ti et al. Finally, we summarise its limitations and spotlight areas that need to be addressed to better define the underlying molecular mechanisms.
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Affiliation(s)
- Marie-Theres Zeuner
- Stem Cell Biology and Regenerative Medicine Group, Reading School of Pharmacy, University of Reading, Whiteknights Campus, PO Box 226, Reading, RG6 6AP, UK.
| | - Ketan Patel
- School of Biological Sciences, University of Reading, Whiteknights Campus, Reading, UK. .,Freiburg Institute for Advanced Studies (FRIAS), University of Freiburg, Albertstr. 19, 79104, Freiburg, Germany.
| | - Bernd Denecke
- Interdisciplinary Center for Clinical Research Aachen (IZKF Aachen), RWTH Aachen University, Aachen, Germany.
| | - Bernd Giebel
- Institute for Transfusion Medicine, University Hospital Essen, University Duisburg-Essen, Essen, Germany.
| | - Darius Widera
- Stem Cell Biology and Regenerative Medicine Group, Reading School of Pharmacy, University of Reading, Whiteknights Campus, PO Box 226, Reading, RG6 6AP, UK.
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187
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Dong H, Zhang Y, Song L, Kim DS, Wu H, Yang L, Li S, Morgan KA, Adams DB, Wang H. Cell-Permeable Peptide Blocks TLR4 Signaling and Improves Islet Allograft Survival. Cell Transplant 2016; 25:1319-29. [PMID: 26771084 DOI: 10.3727/096368916x690449] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Toll-like receptor 4 (TLR4) activation in pancreatic β cells activates aberrant islet graft cellular pathways and contributes to immune rejection in allogeneic islet transplantation. As an approach to overcoming this problem, we determined the capacity of a 33-amino acid peptide consisting of a protein transduction domain (PTD) from the Hph-1 virus and a fragment of the intracellular domain of TLR4 from the C3H mice (PTD-dnTLR4) to block TLR4 signaling and improve allogeneic islet survival in vitro and after transplantation. The efficacy of PTD-dnTLR4 in blocking TLR4 signaling was assessed in the Raw264.7 macrophage line, in the islets, and the βTC3 cell line. In Raw264.7 cells, preculture with the peptide reduced LPS-induced NF-κB activation and production of proinflammatory cytokines (IL-1β, TNF-α, iNOS, and IL-6). In islets and β cells, preincubation with PTD-dnTLR4 suppressed LPS-induced TNF-α expression via inhibition of NF-κB activation and protected them from stress-induced cell death. In vivo, preincubation of BALB/c (H-2(d)) islets with PTD-dnTLR4 resulted in significantly longer survival than control islets in a streptozotocin-induced diabetes model (two of seven grafts survived long term >100 days). PTD-dnTLR4-treated grafts exhibited reduced expression of TNF-α and iNOS and reduced macrophage infiltration posttransplant. The data indicate that PTD-dnTLR4 blocked TLR4 signaling in both macrophages and β cells, and prolonged allograft survival at least in part by suppressing inflammation and macrophage infiltration. This strategy for blocking TLR4 activity has potential utilization in the treatment of diseases where excessive TLR4 activation contributes to the pathologic cellular pathways such as islet transplantation.
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Affiliation(s)
- Huansheng Dong
- Department of Surgery, Medical University of South Carolina, Charleston, SC, USA
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188
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Ahn SI, Kim JS, Hong CY, Gu GJ, Shin HM, Jeong HJ, Koh KO, Mang JY, Kim DY, Youn HS. 1-[4-Fluoro-2-(2-nitrovinyl)phenyl]pyrrolidine Suppresses Toll-Like Receptor 4 Dimerization Induced by Lipopolysaccharide. J Immunoassay Immunochem 2016; 37:307-15. [PMID: 26744907 DOI: 10.1080/15321819.2015.1135162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Toll-like receptor 4 (TLR4) recognizes LPS and triggers the activation of the myeloid differential factor 88 (MyD88)- and toll-interleukin-1 receptor domain-containing adapter, inducing interferon-β (TRIF)-dependent major downstream signaling pathways. Previously, we presented biochemical evidence that 1-[4-Fluoro-2-(2-nitrovinyl)phenyl]pyrrolidine (FPP), which was synthesized in our laboratory, inhibits NF-κB activation induced by LPS. Here, we investigated whether FPP modulates the TLR4 downstream signaling pathways and what anti-inflammatory target in TLR4 signaling is regulated by FPP. FPP inhibited LPS-induced NF-κB activation by targeting TLR4 dimerization. These results suggest that FPP can modulate the TLR4 signaling pathway at the receptor level to decrease inflammatory gene expression.
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Affiliation(s)
- Sang-Ii Ahn
- a Department of Medical Science , College of Medical Sciences, SoonChunHyang University , Asan-Si , Chungnam , Republic of Korea
| | - Ji-Soo Kim
- a Department of Medical Science , College of Medical Sciences, SoonChunHyang University , Asan-Si , Chungnam , Republic of Korea
| | - Chae-Yeon Hong
- b Department of Biomedical Laboratory Science , College of Medical Sciences, SoonChunHyang University , Asan-Si , Chungnam , Republic of Korea
| | - Gyo-Jeong Gu
- a Department of Medical Science , College of Medical Sciences, SoonChunHyang University , Asan-Si , Chungnam , Republic of Korea
| | - Hyeon-Myeong Shin
- b Department of Biomedical Laboratory Science , College of Medical Sciences, SoonChunHyang University , Asan-Si , Chungnam , Republic of Korea
| | - Hyun Jung Jeong
- c Department of Chemistry , College of Natural Sciences, SoonChunHyang University , Asan-Si , Chungnam , Republic of Korea
| | - Kwang Oh Koh
- c Department of Chemistry , College of Natural Sciences, SoonChunHyang University , Asan-Si , Chungnam , Republic of Korea
| | - Joo Yang Mang
- c Department of Chemistry , College of Natural Sciences, SoonChunHyang University , Asan-Si , Chungnam , Republic of Korea
| | - Dae Young Kim
- c Department of Chemistry , College of Natural Sciences, SoonChunHyang University , Asan-Si , Chungnam , Republic of Korea
| | - Hyung-Sun Youn
- a Department of Medical Science , College of Medical Sciences, SoonChunHyang University , Asan-Si , Chungnam , Republic of Korea.,b Department of Biomedical Laboratory Science , College of Medical Sciences, SoonChunHyang University , Asan-Si , Chungnam , Republic of Korea
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189
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Abstract
For many years innate immunity was regarded as a relatively nonspecific set of mechanisms serving as a first line of defence to contain infections while the more refined adaptive immune response was developing. The discovery of pattern recognition receptors (PRRs) revolutionised the prevailing view of innate immunity, revealing its intimate connection with adaptive immunity and generation of effector and memory T- and B-cell responses. Among the PRRs, families of Toll-like receptors (TLRs), C-type lectin receptors (CLR), retinoic acid-inducible gene-I (RIG-I)-like receptors (RLRs) and nucleotide-binding domain, leucine-rich repeat-containing protein receptors (NLRs), along with a number of cytosolic DNA sensors and the family of absent in melanoma (AIM)-like receptors (ALRs), have been characterised. NLR sensors have been a particular focus of attention, and some NLRs have emerged as key orchestrators of the inflammatory response through the formation of large multiprotein complexes termed inflammasomes. However, several other functions not related to inflammasomes have also been described for NLRs. This chapter introduces the different families of PRRs, their signalling pathways, cross-regulation and their roles in immunosurveillance. The structure and function of NLRs is also discussed with particular focus on the non-inflammasome NLRs.
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190
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Liu L, Zhao XW, Song YM, Li QH, Li P, Liu RR, Zheng MQ, Wen J, Zhao GP. Difference in resistance to Salmonella enteritidis infection among allelic variants of TLR4 (903, 1832) in SPF chickens. J Appl Genet 2015; 57:389-96. [PMID: 26631064 DOI: 10.1007/s13353-015-0324-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Revised: 06/14/2015] [Accepted: 10/14/2015] [Indexed: 11/25/2022]
Affiliation(s)
- L Liu
- Key Laboratory of Genetics Resources and Utilization of Livestock, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
- Animal Genetic Resources Laboratory, College of Animal Science and Technology, Yangzhou University, Yangzhou, Jiangsu, 225009, China
| | - X W Zhao
- Key Laboratory of Genetics Resources and Utilization of Livestock, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Y M Song
- Key Laboratory of Genetics Resources and Utilization of Livestock, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - Q H Li
- Key Laboratory of Genetics Resources and Utilization of Livestock, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - P Li
- Key Laboratory of Genetics Resources and Utilization of Livestock, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - R R Liu
- Key Laboratory of Genetics Resources and Utilization of Livestock, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - M Q Zheng
- Key Laboratory of Genetics Resources and Utilization of Livestock, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - J Wen
- Key Laboratory of Genetics Resources and Utilization of Livestock, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China
| | - G P Zhao
- Key Laboratory of Genetics Resources and Utilization of Livestock, Institute of Animal Science, Chinese Academy of Agricultural Sciences, Beijing, 100193, China.
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191
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Saric A, Hipolito VEB, Kay JG, Canton J, Antonescu CN, Botelho RJ. mTOR controls lysosome tubulation and antigen presentation in macrophages and dendritic cells. Mol Biol Cell 2015; 27:321-33. [PMID: 26582390 PMCID: PMC4713134 DOI: 10.1091/mbc.e15-05-0272] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 11/13/2015] [Indexed: 01/09/2023] Open
Abstract
Macrophages and dendritic cells exposed to lipopolysaccharide (LPS) convert their lysosomes from small, punctate organelles into a network of tubules. Tubular lysosomes have been implicated in phagosome maturation, retention of fluid phase, and antigen presentation. There is a growing appreciation that lysosomes act as sensors of stress and the metabolic state of the cell through the kinase mTOR. Here we show that LPS stimulates mTOR and that mTOR is required for LPS-induced lysosome tubulation and secretion of major histocompatibility complex II in macrophages and dendritic cells. Specifically, we show that the canonical phosphatidylinositol 3-kinase-Akt-mTOR signaling pathway regulates LPS-induced lysosome tubulation independently of IRAK1/4 and TBK. Of note, we find that LPS treatment augmented the levels of membrane-associated Arl8b, a lysosomal GTPase required for tubulation that promotes kinesin-dependent lysosome movement to the cell periphery, in an mTOR-dependent manner. This suggests that mTOR may interface with the Arl8b-kinesin machinery. To further support this notion, we show that mTOR antagonists can block outward movement of lysosomes in cells treated with acetate but have no effect in retrograde movement upon acetate removal. Overall our work provides tantalizing evidence that mTOR plays a role in controlling lysosome morphology and trafficking by modulating microtubule-based motor activity in leukocytes.
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Affiliation(s)
- Amra Saric
- Molecular Science Program and Department of Chemistry and Biology, Ryerson University, Toronto, ON M5B 2K3, Canada
| | - Victoria E B Hipolito
- Molecular Science Program and Department of Chemistry and Biology, Ryerson University, Toronto, ON M5B 2K3, Canada
| | - Jason G Kay
- Department of Oral Biology, University at Buffalo, Buffalo, NY 14214
| | - Johnathan Canton
- Program in Cell Biology, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada
| | - Costin N Antonescu
- Molecular Science Program and Department of Chemistry and Biology, Ryerson University, Toronto, ON M5B 2K3, Canada
| | - Roberto J Botelho
- Molecular Science Program and Department of Chemistry and Biology, Ryerson University, Toronto, ON M5B 2K3, Canada
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192
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Hwang EH, Kim TH, Oh SM, Lee KB, Yang SJ, Park JH. Toll/IL-1 domain-containing adaptor inducing IFN-β (TRIF) mediates innate immune responses in murine peritoneal mesothelial cells through TLR3 and TLR4 stimulation. Cytokine 2015; 77:127-34. [PMID: 26579632 PMCID: PMC7128242 DOI: 10.1016/j.cyto.2015.11.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 10/22/2015] [Accepted: 11/05/2015] [Indexed: 01/27/2023]
Abstract
TRIF is involved in cytokines and chemokines production by poly I:C and LPS in PMCs. TRIF mediates iNOS expression and NO production by poly I:C or LPS in PMCs. TRIF is required for IFN-β gene expression in PMCs stimulated by poly I:C or LPS. TRIF is essential for optimal production of IL-6, CXCL1, and CCL2 by live G-bacteria.
Mesothelial cells are composed of monolayer of the entire surface of serosal cavities including pleural, pericardial, and peritoneal cavity. Although mesothelial cells are known to express multiple Toll-like receptors (TLRs) which contribute to trigger innate immune responses against infections, the precise molecular mechanism remains still unclear. In the present study, we investigated the role of Toll/IL-1 domain-containing adaptor inducing IFN-β (TRIF), one of the two major TLRs–adaptor molecules, on innate immune response induced by TLR3 and TLR4 stimulation in murine peritoneal mesothelial cells (PMCs). TRIF was strongly expressed in PMCs and its deficiency led to impaired production of cytokines and chemokines by poly I:C and LPS in the cells. Activation of NF-κB or MAPKs through poly I:C and LPS stimulation was reduced in TRIF-deficient PMCs as compared to the WT cells. TRIF was also necessary for optimal nitric oxide synthesis and gene expression of inducible nitric oxide synthase (iNOS) and IFN-β in PMCs in response to poly I:C and LPS. Furthermore, both Escherichia coli and Pseudomonas aeruginosa induced high level of IL-6, CXCL1, and CCL2 production in PMCs, which was significantly impaired by TRIF deficiency. These results demonstrated that TRIF is required for optimal activation of innate immune responses in mesothelial cells against microbial infections.
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Affiliation(s)
- Eun-Ha Hwang
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon 302-718, Republic of Korea
| | - Tae-Hyoun Kim
- BK21 PLUS Program for Creative Veterinary Science Research, College of Veterinary Medicine, Seoul National University, Seoul 151-742, Republic of Korea
| | - Sang-Muk Oh
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon 302-718, Republic of Korea
| | - Kyung-Bok Lee
- Department of Biochemistry, College of Medicine, Konyang University, Daejeon 302-718, Republic of Korea
| | - Soo-Jin Yang
- School of Bioresources and Bioscience, Chung-Ang University, Anseong 456-756, Republic of Korea
| | - Jong-Hwan Park
- Laboratory Animal Medicine, College of Veterinary Medicine, Chonnam National University, Gwangju 500-757, Republic of Korea.
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193
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Lampiasi N, Montana G. The molecular events behind ferulic acid mediated modulation of IL-6 expression in LPS-activated Raw 264.7 cells. Immunobiology 2015; 221:486-93. [PMID: 26612455 DOI: 10.1016/j.imbio.2015.11.001] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Revised: 10/30/2015] [Accepted: 11/02/2015] [Indexed: 12/31/2022]
Abstract
Identification of new antioxidant and anti-inflammatory bioactive molecules is an important tool for selecting effective formulations for the treatment of inflammation. The mouse macrophage cell line RAW 264.7, lipopolysaccharide (LPS)-activated, is associated with an inflammation response. Activated macrophages produce reactive oxygen species (ROS), nitric oxide (NO) and inflammatory cytokines such as IL-6, TNF-α and IL-10. In the present study we have showed that pre-treatment with Ferulic Acid (FA) reduces NO accumulation in the culture medium of LPS-induced macrophage cells. Moreover, real-time experiments have revealed that FA has an inhibitory effect at the transcriptional level on the expression of some inflammatory mediators such as IL-6, TNF-α and iNOS and an activation effect on the expression of some antioxidant molecules such as Metallothioneins (MT-1, MT-2). Importantly, we have found that FA reduced the translocation of NF-E2-related factor 2 (Nrf2) and nuclear transcription factor-κB (NF-κB) into the nuclei through a reduction of the expression of phosphorylated IKK and consequently inhibited IL-6 and NF-κB promoter activity in a luciferase assay. Our data clearly suggest that FA anti-inflammatory effects are mainly mediated through IKK/NF-κB signalling pathway. Therefore, FA could represent a new natural drug extremely useful to improve anti-inflammatory treatment.
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Affiliation(s)
- Nadia Lampiasi
- Istituto di Biomedicina e Immunologia Molecolare "Alberto Monroy", Consiglio Nazionale delle Ricerche, Via Ugo La Malfa 153, 90146 Palermo, Italy
| | - Giovanna Montana
- Istituto di Biomedicina e Immunologia Molecolare "Alberto Monroy", Consiglio Nazionale delle Ricerche, Via Ugo La Malfa 153, 90146 Palermo, Italy.
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194
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Yamaba S, Yamada S, Kajikawa T, Awata T, Sakashita H, Tsushima K, Fujihara C, Yanagita M, Murakami S. PLAP-1/Asporin Regulates TLR2- and TLR4-induced Inflammatory Responses. J Dent Res 2015; 94:1706-14. [PMID: 26399972 DOI: 10.1177/0022034515606859] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Periodontal ligament-associated protein 1 (PLAP-1)/asporin is an extracellular matrix protein preferentially expressed in periodontal ligaments. PLAP-1/asporin inhibits the cytodifferentiation and mineralization of periodontal ligament cells and has important roles in the maintenance of periodontal tissue homeostasis. However, the involvement of PLAP-1/asporin in inflammatory responses during periodontitis is poorly understood. This study hypothesized that PLAP-1/asporin might affect the pathogenesis of periodontitis by regulating periodontopathic bacteria-induced inflammatory responses. Proinflammatory cytokine expression induced by Toll-like receptor 2 (TLR2) and TLR4 was significantly downregulated when PLAP-1/asporin was overexpressed in periodontal ligament cells. Similarly, recombinant PLAP-1/asporin inhibited TLR2- and TLR4-induced proinflammatory cytokine expression in macrophages. We also confirmed that NF-κB activity induced by TLR2 and TLR4 signaling was suppressed by the addition of recombinant PLAP-1/asporin. Furthermore, IκB kinase α degradation induced by TLR4 was reduced by PLAP-1/asporin. Immunoprecipitation assays demonstrated the binding abilities of PLAP-1/asporin to both TLR2 and TLR4. Taken together, PLAP-1/asporin negatively regulates TLR2- and TLR4-induced inflammatory responses through direct molecular interactions. These findings indicate that PLAP-1/asporin has a defensive role in periodontitis lesions by suppressing pathophysiologic TLR signaling and that the modulating effects of PLAP-1/asporin might be useful for periodontal treatments.
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Affiliation(s)
- S Yamaba
- Department of Periodontology, Osaka University Graduate School, Suita, Osaka, Japan
| | - S Yamada
- Department of Periodontology, Osaka University Graduate School, Suita, Osaka, Japan
| | - T Kajikawa
- Department of Periodontology, Osaka University Graduate School, Suita, Osaka, Japan
| | - T Awata
- Department of Periodontology, Osaka University Graduate School, Suita, Osaka, Japan
| | - H Sakashita
- Department of Periodontology, Osaka University Graduate School, Suita, Osaka, Japan
| | - K Tsushima
- Department of Periodontology, Osaka University Graduate School, Suita, Osaka, Japan
| | - C Fujihara
- Department of Periodontology, Osaka University Graduate School, Suita, Osaka, Japan
| | - M Yanagita
- Department of Periodontology, Osaka University Graduate School, Suita, Osaka, Japan
| | - S Murakami
- Department of Periodontology, Osaka University Graduate School, Suita, Osaka, Japan
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195
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Khakpour S, Wilhelmsen K, Hellman J. Vascular endothelial cell Toll-like receptor pathways in sepsis. Innate Immun 2015; 21:827-46. [DOI: 10.1177/1753425915606525] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2015] [Accepted: 08/11/2015] [Indexed: 12/20/2022] Open
Abstract
The endothelium forms a vast network that dynamically regulates vascular barrier function, coagulation pathways and vasomotor tone. Microvascular endothelial cells are uniquely situated to play key roles during infection and injury, owing to their widespread distribution throughout the body and their constant interaction with circulating blood. While not viewed as classical immune cells, endothelial cells express innate immune receptors, including the Toll-like receptors (TLRs), which activate intracellular inflammatory pathways mediated through NF-κB and the MAP kinases. TLR agonists, including LPS and bacterial lipopeptides, directly upregulate microvascular endothelial cell expression of inflammatory mediators. Intriguingly, TLR activation also modulates microvascular endothelial cell permeability and the expression of coagulation pathway intermediaries. Microvascular thrombi have been hypothesized to trap microorganisms thereby limiting the spread of infection. However, dysregulated activation of endothelial inflammatory pathways is also believed to lead to coagulopathy and increased vascular permeability, which together promote sepsis-induced organ failure. This article reviews vascular endothelial cell innate immune pathways mediated through the TLRs as they pertain to sepsis, highlighting links between TLRs and coagulation and permeability pathways, and their role in healthy and pathologic responses to infection and sepsis.
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Affiliation(s)
- Samira Khakpour
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
- Biomedical Sciences and Immunology Programs, University of California, San Francisco, CA, USA
| | - Kevin Wilhelmsen
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
| | - Judith Hellman
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA
- Biomedical Sciences and Immunology Programs, University of California, San Francisco, CA, USA
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196
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Ahn SI, Kim JS, Hong CY, Gu GJ, Shin HM, Paek JH, Kim S, Lim SS, Youn HS. Eupatorium makinoisuppresses toll-like receptor signaling pathways. FOOD AGR IMMUNOL 2015. [DOI: 10.1080/09540105.2015.1086315] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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197
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Liang KC, Patil A, Nakai K. Discovery of Intermediary Genes between Pathways Using Sparse Regression. PLoS One 2015; 10:e0137222. [PMID: 26348038 PMCID: PMC4562633 DOI: 10.1371/journal.pone.0137222] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Accepted: 08/14/2015] [Indexed: 01/18/2023] Open
Abstract
The use of pathways and gene interaction networks for the analysis of differential expression experiments has allowed us to highlight the differences in gene expression profiles between samples in a systems biology perspective. The usefulness and accuracy of pathway analysis critically depend on our understanding of how genes interact with one another. That knowledge is continuously improving due to advances in next generation sequencing technologies and in computational methods. While most approaches treat each of them as independent entities, pathways actually coordinate to perform essential functions in a cell. In this work, we propose a methodology based on a sparse regression approach to find genes that act as intermediary to and interact with two pathways. We model each gene in a pathway using a set of predictor genes, and a connection is formed between the pathway gene and a predictor gene if the sparse regression coefficient corresponding to the predictor gene is non-zero. A predictor gene is a shared neighbor gene of two pathways if it is connected to at least one gene in each pathway. We compare the sparse regression approach to Weighted Correlation Network Analysis and a correlation distance based approach using time-course RNA-Seq data for dendritic cell from wild type, MyD88-knockout, and TRIF-knockout mice, and a set of RNA-Seq data from 60 Caucasian individuals. For the sparse regression approach, we found overrepresented functions for shared neighbor genes between TLR-signaling pathway and antigen processing and presentation, apoptosis, and Jak-Stat pathways that are supported by prior research, and compares favorably to Weighted Correlation Network Analysis in cases where the gene association signals are weak.
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Affiliation(s)
- Kuo-ching Liang
- Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Ashwini Patil
- Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Kenta Nakai
- Institute of Medical Science, The University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
- * E-mail:
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198
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Lee HR, Jeon JH, Park OK, Chun JH, Park J, Rhie GE. The poly-γ-d-glutamic acid capsule surrogate of the Bacillus anthracis capsule induces nitric oxide production via the platelet activating factor receptor signaling pathway. Mol Immunol 2015; 68:244-52. [PMID: 26350415 DOI: 10.1016/j.molimm.2015.08.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 08/27/2015] [Accepted: 08/29/2015] [Indexed: 01/01/2023]
Abstract
The poly-γ-d-glutamic acid (PGA) capsule, a major virulence factor of Bacillus anthracis, confers protection of the bacillus from phagocytosis and allows its unimpeded growth in the host. PGA capsules released from B. anthracis are associated with lethal toxin in the blood of experimentally infected animals and enhance the cytotoxic effect of lethal toxin on macrophages. In addition, PGA capsule itself activates macrophages and dendritic cells to produce proinflammatory cytokine such as IL-1β, indicating multiple roles of PGA capsule in anthrax pathogenesis. Here we report that PGA capsule of Bacillus licheniformis, a surrogate of B. anthracis capsule, induces production of nitric oxide (NO) in RAW264.7 cells and bone marrow-derived macrophages. NO production was induced by PGA in a dose-dependent manner and was markedly reduced by inhibitors of inducible NO synthase (iNOS), suggesting iNOS-dependent production of NO. Induction of NO production by PGA was not observed in macrophages from TLR2-deficient mice and was also substantially inhibited in RAW264.7 cells by pretreatment of TLR2 blocking antibody. Subsequently, the downstream signaling events such as ERK, JNK and p38 of MAPK pathways as well as NF-κB activation were required for PGA-induced NO production. In addition, the induced NO production was significantly suppressed by treatment with antagonists of platelet activating factor receptor (PAFR) or PAFR siRNA, and mediated through PAFR/Jak2/STAT-1 signaling pathway. These findings suggest that PGA capsule induces NO production in macrophages by triggering both TLR2 and PAFR signaling pathways which lead to activation of NF-kB and STAT-1, respectively.
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Affiliation(s)
- Hae-Ri Lee
- Division of High-Risk Pathogen Research, Center for Infectious Diseases, Korea National Institute of Health, Cheongju-si, Chungcheongbuk-do 363-951, South Korea
| | - Jun Ho Jeon
- Division of High-Risk Pathogen Research, Center for Infectious Diseases, Korea National Institute of Health, Cheongju-si, Chungcheongbuk-do 363-951, South Korea
| | - Ok-Kyu Park
- Division of High-Risk Pathogen Research, Center for Infectious Diseases, Korea National Institute of Health, Cheongju-si, Chungcheongbuk-do 363-951, South Korea
| | - Jeong-Hoon Chun
- Division of High-Risk Pathogen Research, Center for Infectious Diseases, Korea National Institute of Health, Cheongju-si, Chungcheongbuk-do 363-951, South Korea
| | - Jungchan Park
- Department of Bioscience and Biotechnology, Yongin 449-791, South Korea; Protein Research Center for Bioindustry, Hankuk University of Foreign Studies, Yongin 449-791, South Korea
| | - Gi-Eun Rhie
- Division of High-Risk Pathogen Research, Center for Infectious Diseases, Korea National Institute of Health, Cheongju-si, Chungcheongbuk-do 363-951, South Korea.
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199
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Lipopolysaccharide of Aggregatibacter actinomycetemcomitans induces the expression of chemokines MCP-1, MIP-1α, and IP-10 via similar but distinct signaling pathways in murine macrophages. Immunobiology 2015; 220:1067-74. [DOI: 10.1016/j.imbio.2015.05.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Revised: 03/18/2015] [Accepted: 05/01/2015] [Indexed: 11/23/2022]
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200
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Neuman MG, Maor Y, Nanau RM, Melzer E, Mell H, Opris M, Cohen L, Malnick S. Alcoholic Liver Disease: Role of Cytokines. Biomolecules 2015; 5:2023-34. [PMID: 26343741 PMCID: PMC4598786 DOI: 10.3390/biom5032023] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Revised: 08/21/2015] [Accepted: 08/24/2015] [Indexed: 02/07/2023] Open
Abstract
The present review spans a broad spectrum of topics dealing with alcoholic liver disease (ALD), including clinical and translational research. It focuses on the role of the immune system and the signaling pathways of cytokines in the pathogenesis of ALD. An additional factor that contributes to the pathogenesis of ALD is lipopolysaccharide (LPS), which plays a central role in the induction of steatosis, inflammation, and fibrosis in the liver. LPS derived from the intestinal microbiota enters the portal circulation, and is recognized by macrophages (Kupffer cells) and hepatocytes. In individuals with ALD, excessive levels of LPS in the liver affect immune, parenchymal, and non-immune cells, which in turn release various inflammatory cytokines and recruit neutrophils and other inflammatory cells. In this review, we elucidate the mechanisms by which alcohol contributes to the activation of Kupffer cells and the inflammatory cascade. The role of the stellate cells in fibrogenesis is also discussed.
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Affiliation(s)
- Manuela G Neuman
- In Vitro Drug Safety and Biotechnology, University of Toronto, Toronto, ON M5G 0A3, Canada.
- Department of Pharmacology and Toxicology, Faculty of Medicine, University of Toronto, Toronto, ON M5G 0A3, Canada.
| | - Yaakov Maor
- Division of Gastroenterology, Kaplan Health Sciences Centre, Department of Medicine, Faculty of Medicine, Hebrew University, Rehovot 76100, Israel.
| | - Radu M Nanau
- In Vitro Drug Safety and Biotechnology, University of Toronto, Toronto, ON M5G 0A3, Canada.
| | - Ehud Melzer
- Division of Gastroenterology, Kaplan Health Sciences Centre, Department of Medicine, Faculty of Medicine, Hebrew University, Rehovot 76100, Israel.
| | - Haim Mell
- Israel Anti-Drug Authority, Jerusalem 91039, Israel.
| | - Mihai Opris
- In Vitro Drug Safety and Biotechnology, University of Toronto, Toronto, ON M5G 0A3, Canada.
- Casa de Ajutor Reciproc, Bucharest 031621, Romania.
| | - Lawrence Cohen
- Sunnybrook Health Sciences Centre and Department of Internal Medicine, University of Toronto, Toronto, ON M5G 0A3, Canada.
| | - Stephen Malnick
- Division of Gastroenterology, Kaplan Health Sciences Centre, Department of Medicine, Faculty of Medicine, Hebrew University, Rehovot 76100, Israel.
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