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DeWolf SE, Hawkes AA, Kurian SM, Gorial DE, Hepokoski ML, Almeida SS, Posner IR, McKay DB. Human pulmonary microvascular endothelial cells respond to DAMPs from injured renal tubular cells. Pulm Circ 2024; 14:e12379. [PMID: 38962184 PMCID: PMC11220341 DOI: 10.1002/pul2.12379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 04/23/2024] [Accepted: 04/23/2024] [Indexed: 07/05/2024] Open
Abstract
Acute kidney injury (AKI) causes distant organ dysfunction through yet unknown mechanisms, leading to multiorgan failure and death. The lungs are one of the most common extrarenal organs affected by AKI, and combined lung and kidney injury has a mortality as high as 60%-80%. One mechanism that has been implicated in lung injury after AKI involves molecules released from injured kidney cells (DAMPs, or damage-associated molecular patterns) that promote a noninfectious inflammatory response by binding to pattern recognition receptors (PRRs) constitutively expressed on the pulmonary endothelium. To date there are limited data investigating the role of PRRs and DAMPs in the pulmonary endothelial response to AKI. Understanding these mechanisms holds great promise for therapeutics aimed at ameliorating the devastating effects of AKI. In this study, we stimulate primary human microvascular endothelial cells with DAMPs derived from injured primary renal tubular epithelial cells (RTECs) as an ex-vivo model of lung injury following AKI. We show that DAMPs derived from injured RTECs cause activation of Toll-Like Receptor and NOD-Like Receptor signaling pathways as well as increase human primary pulmonary microvascular endothelial cell (HMVEC) cytokine production, cell signaling activation, and permeability. We further show that cytokine production in HMVECs in response to DAMPs derived from RTECs is reduced by the inhibition of NOD1 and NOD2, which may have implications for future therapeutics. This paper adds to our understanding of PRR expression and function in pulmonary HMVECs and provides a foundation for future work aimed at developing therapeutic strategies to prevent lung injury following AKI.
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Affiliation(s)
- Sean E. DeWolf
- Department of Pulmonary and Critical Care MedicineUniversity of California San DiegoSan DiegoCaliforniaUSA
- Department of ImmunologyThe Scripps Research InstituteLa JollaCaliforniaUSA
| | - Alana A. Hawkes
- Department of ImmunologyThe Scripps Research InstituteLa JollaCaliforniaUSA
| | - Sunil M. Kurian
- Scripps Clinic Bio‐Repository & Bio‐Informatics Core, Scripps HealthLa JollaCaliforniaUSA
- Department of SurgeryScripps Clinic and Green HospitalLa JollaCaliforniaUSA
| | - Diana E. Gorial
- Department of ImmunologyThe Scripps Research InstituteLa JollaCaliforniaUSA
| | - Mark L. Hepokoski
- Department of Pulmonary and Critical Care MedicineUniversity of California San DiegoSan DiegoCaliforniaUSA
- Department of Pulmonary and Critical Care MedicineVeterans AdministrationSan DiegoCaliforniaUSA
| | | | - Isabella R. Posner
- Department of ImmunologyThe Scripps Research InstituteLa JollaCaliforniaUSA
| | - Dianne B. McKay
- Department of ImmunologyThe Scripps Research InstituteLa JollaCaliforniaUSA
- Department of SurgeryScripps Clinic and Green HospitalLa JollaCaliforniaUSA
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2
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Liu Q, Dong Y, Escames G, Wu X, Ren J, Yang W, Zhang S, Zhu Y, Tian Y, Acuña‐Castroviejo D, Yang Y. Identification of PIK3CG as a hub in septic myocardial injury using network pharmacology and weighted gene co-expression network analysis. Bioeng Transl Med 2022; 8:e10384. [PMID: 36684068 PMCID: PMC9842026 DOI: 10.1002/btm2.10384] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 06/13/2022] [Accepted: 07/16/2022] [Indexed: 01/25/2023] Open
Abstract
Sepsis causes multiple organ injuries, among which the heart is one most severely damaged organ. Melatonin (MEL) alleviates septic myocardial injury, although a systematic and comprehensive approach is still lacking to understand the precise protective machinery of MEL. This study aimed to examine the underlying mechanisms of MEL on improvement of septic myocardial injury at a systematic level. This study integrated three analytic modalities including database investigations, RNA-seq analysis, and weighted gene co-expression network analysis (WCGNA), in order to acquire a set of genes associated with the pathogenesis of sepsis. The Drugbank database was employed to predict genes that may serve as pharmacological targets for MEL-elicited benefits, if any. A pharmacological protein-protein interaction network was subsequently constructed, and 66 hub genes were captured which were enriched in a variety of immune response pathways. Notably, PIK3CG, one of the hub genes, displayed high topological characteristic values, strongly suggesting its promise as a novel target for MEL-evoked treatment of septic myocardial injury. Importantly, molecular docking simulation experiments as well as in vitro and in vivo studies supported an essential role for PIK3CG in MEL-elicited effect on septic myocardial injury. This study systematically clarified the mechanisms of MEL intervention in septic myocardial injury involved multiple targets and multiple pathways. Moreover, PIK3CG-governed signaling cascade plays an important role in the etiology of sepsis and septic myocardial injury. Findings from our study provide valuable information on novel intervention targets for the management of septic myocardial injury. More importantly, this study has indicated the utility of combining a series of techniques for disease target discovery and exploration of possible drug targets, which should shed some light on elucidation of experimental and clinical drug action mechanisms systematically.
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Affiliation(s)
- Qiong Liu
- Key Laboratory of Resource Biology and Biotechnology in Western ChinaMinistry of Education, Faculty of life Science and Medicine, Northwest UniversityXi'anChina,Xi'an Key Laboratory of Cardiovascular and Cerebrovascular DiseasesXi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Faculty of life Science and Medicine, Northwest UniversityXi'anChina
| | - Yushu Dong
- Institute of Neuroscience, General Hospital of Northern Theater CommandShenyangChina
| | - Germaine Escames
- Biomedical Research Center, Health Sciences Technology ParkUniversity of GranadaGranadaSpain,Ibs. Granada, CIBERfesGranadaSpain,UGC of Clinical LaboratoriesUniversitu San Cecilio's HospitalGranadaSpain
| | - Xue Wu
- Key Laboratory of Resource Biology and Biotechnology in Western ChinaMinistry of Education, Faculty of life Science and Medicine, Northwest UniversityXi'anChina,Xi'an Key Laboratory of Cardiovascular and Cerebrovascular DiseasesXi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Faculty of life Science and Medicine, Northwest UniversityXi'anChina
| | - Jun Ren
- Department of CardiologyZhongshan Hospital, Fudan UniversityShanghaiChina,Shanghai Institute of Cardiovascular DiseasesShanghaiChina,Department of Laboratory Medicine and PathologyUniversity of WashingtonSeattleWashingtonUSA
| | - Wenwen Yang
- Key Laboratory of Resource Biology and Biotechnology in Western ChinaMinistry of Education, Faculty of life Science and Medicine, Northwest UniversityXi'anChina,Xi'an Key Laboratory of Cardiovascular and Cerebrovascular DiseasesXi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Faculty of life Science and Medicine, Northwest UniversityXi'anChina
| | - Shaofei Zhang
- Key Laboratory of Resource Biology and Biotechnology in Western ChinaMinistry of Education, Faculty of life Science and Medicine, Northwest UniversityXi'anChina,Xi'an Key Laboratory of Cardiovascular and Cerebrovascular DiseasesXi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Faculty of life Science and Medicine, Northwest UniversityXi'anChina
| | - Yanli Zhu
- Key Laboratory of Resource Biology and Biotechnology in Western ChinaMinistry of Education, Faculty of life Science and Medicine, Northwest UniversityXi'anChina,Xi'an Key Laboratory of Cardiovascular and Cerebrovascular DiseasesXi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Faculty of life Science and Medicine, Northwest UniversityXi'anChina
| | - Ye Tian
- Key Laboratory of Resource Biology and Biotechnology in Western ChinaMinistry of Education, Faculty of life Science and Medicine, Northwest UniversityXi'anChina,Xi'an Key Laboratory of Cardiovascular and Cerebrovascular DiseasesXi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Faculty of life Science and Medicine, Northwest UniversityXi'anChina
| | - Darío Acuña‐Castroviejo
- Biomedical Research Center, Health Sciences Technology ParkUniversity of GranadaGranadaSpain,Ibs. Granada, CIBERfesGranadaSpain,UGC of Clinical LaboratoriesUniversitu San Cecilio's HospitalGranadaSpain
| | - Yang Yang
- Key Laboratory of Resource Biology and Biotechnology in Western ChinaMinistry of Education, Faculty of life Science and Medicine, Northwest UniversityXi'anChina,Xi'an Key Laboratory of Cardiovascular and Cerebrovascular DiseasesXi'an No. 3 Hospital, The Affiliated Hospital of Northwest University, Faculty of life Science and Medicine, Northwest UniversityXi'anChina
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3
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The Yin and Yang of toll-like receptors in endothelial dysfunction. Int Immunopharmacol 2022; 108:108768. [DOI: 10.1016/j.intimp.2022.108768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 04/01/2022] [Accepted: 04/07/2022] [Indexed: 11/24/2022]
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4
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Zhang Q, Liang H, Longshaw M, Wang J, Ge X, Zhu J, Li S, Ren M. Effects of replacing fishmeal with methanotroph (Methylococcus capsulatus, Bath) bacteria meal (FeedKind®) on growth and intestinal health status of juvenile largemouth bass (Micropterus salmoides). FISH & SHELLFISH IMMUNOLOGY 2022; 122:298-305. [PMID: 35143988 DOI: 10.1016/j.fsi.2022.02.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 01/18/2022] [Accepted: 02/05/2022] [Indexed: 06/14/2023]
Abstract
A ten-week feeding trial evaluated the feasibility of methanotroph (Methylococcus capsulatus) bacteria meal (FeedKind®, FK) as a fishmeal substitute in largemouth bass (Micropterus salmoides) diets. Six isonitrogenous and isoenergetic diets with different inclusion levels of FK (0 (fishmeal group), 43, 86, 129, 172 and 215 g/kg) were formulated to replace 0, 50, 100, 150, 200 and 250 g/kg fishmeal, respectively. The results showed that FK inclusion level could reach 129 g/kg without significantly affecting growth or feed coefficient rate (P > 0.05), while growth performance was decreased and feed coefficient rate increased when FK inclusion levels exceeded 129 g/kg (P < 0.05). Increase in FK inclusion levels tended to reduce plasma total cholesterol and total triglyceride whilst plasma total protein, albumin, alanine aminotransferase and aspartate aminotransferase in FK treatment groups were unchanged compared with fishmeal group (P > 0.05). FK inclusion levels at 43 g/kg and 86 g/kg were not detrimental to intestinal morphology whilst it was unfavourable when FK inclusion levels exceeded 86 g/kg as the total length of intestinal wall thickness and villus height, villus height were obviously decreased compared with fishmeal group (P < 0.05). As regards to inflammatory cytokine genes, FK instead of fishmeal increased the expression levels of TLR2, RelA, TNF-α, IL-1β, IL-10 and TGF-β, 43 g/kg and 86 g/kg FK decreased the expression level of Caspase-3 (P < 0.05). In conclusion, 129 g/kg FK can replace 150 g/kg fishmeal without negative effects on the growth performance, and replacing 100 g/kg fishmeal with 86 g/kg FK is more beneficial to intestinal health.
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Affiliation(s)
- Qile Zhang
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi, 214081, China
| | - Hualiang Liang
- Key Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology, FreshwaterFisheries Research Center (FFRC), Chinese Academy of Fishery Sciences (CAFS), Wuxi, 214081, China
| | | | - Jia Wang
- Calysta, Inc., San Mateo, CA, USA
| | - Xianping Ge
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi, 214081, China; Key Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology, FreshwaterFisheries Research Center (FFRC), Chinese Academy of Fishery Sciences (CAFS), Wuxi, 214081, China
| | - Jian Zhu
- Key Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology, FreshwaterFisheries Research Center (FFRC), Chinese Academy of Fishery Sciences (CAFS), Wuxi, 214081, China
| | - Songlin Li
- Research Centre of the Ministry of Agriculture and Rural Affairs on Environmental Ecology and Fish Nutrition, Shanghai Ocean University, Shanghai, 20136, China
| | - Mingchun Ren
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi, 214081, China; Key Laboratory for Genetic Breeding of Aquatic Animals and Aquaculture Biology, FreshwaterFisheries Research Center (FFRC), Chinese Academy of Fishery Sciences (CAFS), Wuxi, 214081, China.
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5
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Liu Q, Tian X, Maruyama D, Arjomandi M, Prakash A. Lung immune tone via gut-lung axis: gut-derived LPS and short-chain fatty acids' immunometabolic regulation of lung IL-1β, FFAR2, and FFAR3 expression. Am J Physiol Lung Cell Mol Physiol 2021; 321:L65-L78. [PMID: 33851870 DOI: 10.1152/ajplung.00421.2020] [Citation(s) in RCA: 58] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Microbial metabolites produced by the gut microbiome, e.g. short-chain fatty acids (SCFA), have been found to influence lung physiology and injury responses. However, how lung immune activity is regulated by SCFA is unknown. We examined fresh human lung tissue and observed the presence of SCFA with interindividual variability. In vitro, SCFA were capable of modifying the metabolic programming in LPS-exposed alveolar macrophages (AM). We hypothesized that lung immune tone could be defined by baseline detection of lung intracellular IL-1β. Therefore, we interrogated naïve mouse lungs with intact gut microbiota for IL-1β mRNA expression and localized its presence within alveolar spaces, specifically within AM subsets. We established that metabolically active gut microbiota, which produce SCFA, can transmit LPS and SCFA to the lung and thereby could create primed lung immunometabolic tone. To understand how murine lung cells sensed and upregulated IL-1β in response to gut microbiome-derived factors, we determined that, in vitro, AM and alveolar type II (AT2) cells expressed SCFA receptors, free fatty acid receptor 2 (FFAR2), free fatty acid receptor 3 (FFAR3), and IL-1β but with distinct expression patterns and different responses to LPS. Finally, we observed that IL-1β, FFAR2, and FFAR3 were expressed in isolated human AM and AT2 cells ex vivo, but in fresh human lung sections in situ, only AM expressed IL-1β at rest and after LPS challenge. Together, this translational study using mouse and human lung tissue and cells point to an important role for the gut microbiome and their SCFA in establishing and regulating lung immune tone.
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Affiliation(s)
- Qing Liu
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, California.,Department of Anesthesiology, Xuan Wu Hospital, Capital Medical University, Beijing, China
| | - Xiaoli Tian
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, California
| | - Daisuke Maruyama
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, California
| | - Mehrdad Arjomandi
- Department of Medicine, University of California, San Francisco, California.,Medical Service, San Francisco VA Medical Center, San Francisco, California
| | - Arun Prakash
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, California.,San Francisco General Hospital, San Francisco, California
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6
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Bian S, Cai H, Cui Y, Liu W, Xiao C. Nanomedicine-Based Therapeutics to Combat Acute Lung Injury. Int J Nanomedicine 2021; 16:2247-2269. [PMID: 33776431 PMCID: PMC7987274 DOI: 10.2147/ijn.s300594] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 02/27/2021] [Indexed: 12/11/2022] Open
Abstract
Acute lung injury (ALI) or its aggravated stage acute respiratory distress syndrome (ARDS) may lead to a life-threatening form of respiratory failure, resulting in high mortality of up to 30-40% in most studies. Although there have been decades of research since ALI was first described in 1967, the clinical therapeutic alternatives for ALI are still in a state of limited availability. Supportive treatment and mechanical ventilation still have priority. Despite some preclinical studies demonstrating the benefit of pharmacological interventions, none of these has been proved completely effective to date. Recent advances in nanotechnology may shed new light on the pharmacotherapy of ALI. Nanomedicine possesses targeting and synergistic therapeutic capability, thus boosting pharmaceutical efficacy and mitigating the side effects. Currently, a variety of nanomedicine with diverse frameworks and functional groups have been elaborately developed, in accordance with their lung targeting ability and the pathophysiology of ALI. The in-depth review of the current literature reveals that liposomes, polymers, inorganic materials, cell membranes, platelets, and other nanomedicine approaches have conferred attractive therapeutic benefits for ALI treatment. In this review, we explore the recent progress in the study of the nanomedicine-based therapy of ALI, presenting various nanomedical approaches, drug choices, therapeutic strategies, and outcomes, thereby providing insight into the trends.
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Affiliation(s)
- Shuai Bian
- Department of Thoracic Surgery, The First Hospital of Jilin University, Changchun, 130021, People’s Republic of China
| | - Hongfei Cai
- Department of Thoracic Surgery, The First Hospital of Jilin University, Changchun, 130021, People’s Republic of China
| | - Youbin Cui
- Department of Thoracic Surgery, The First Hospital of Jilin University, Changchun, 130021, People’s Republic of China
| | - Wanguo Liu
- Department of Orthopedic Surgery, China-Japan Union Hospital of Jilin University, Changchun, 130033, People’s Republic of China
| | - Chunsheng Xiao
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, People’s Republic of China
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7
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Wong E, Xu F, Joffre J, Nguyen N, Wilhelmsen K, Hellman J. ERK1/2 Has Divergent Roles in LPS-Induced Microvascular Endothelial Cell Cytokine Production and Permeability. Shock 2021; 55:349-356. [PMID: 32826812 PMCID: PMC8139579 DOI: 10.1097/shk.0000000000001639] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
ABSTRACT Endothelial cells play a major role in inflammatory responses to infection and sterile injury. Endothelial cells express Toll-like receptor 4 (TLR4) and are activated by LPS to express inflammatory cytokines/chemokines, and to undergo functional changes, including increased permeability. The extracellular signal-regulated kinase 1/2 (ERK1/2) mediates pro-inflammatory signaling in monocytes and macrophages, but the role of ERK1/2 in LPS-induced activation of microvascular endothelial cells has not been defined. We therefore studied the role of ERK1/2 in LPS-induced inflammatory activation and permeability of primary human lung microvascular endothelial cells (HMVEC). Inhibition of ERK1/2 augmented LPS-induced IL-6 and vascular cell adhesion protein (VCAM-1) production by HMVEC. ERK1/2 siRNA knockdown also augmented IL-6 production by LPS-treated HMVEC. Conversely, ERK1/2 inhibition abrogated permeability and restored cell-cell junctions of LPS-treated HMVEC. Consistent with the previously described pro-inflammatory role for ERK1/2 in leukocytes, inhibition of ERK1/2 reduced LPS-induced cytokine/chemokine production by primary human monocytes. Our study identifies a complex role for ERK1/2 in TLR4-activation of HMVEC, independent of myeloid differentiation primary response gene (MyD88) and TIR domain-containing adaptor inducing IFN-β (TRIF) signaling pathways. The activation of ERK1/2 limits LPS-induced IL-6 production by HMVEC, while at the same time promoting HMVEC permeability. Conversely, ERK1/2 activation promotes IL-6 production by human monocytes. Our results suggest that ERK1/2 may play an important role in the nuanced regulation of endothelial cell inflammation and vascular permeability in sepsis and injury.
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Affiliation(s)
- Erika Wong
- Department of Pediatrics, Division of Critical Care, UCSF Benioff Children’s Hospital, San Francisco, California, 94143
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, California, 94143
| | - Fengyun Xu
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, California, 94143
| | - Jérémie Joffre
- Medical Intensive Care Unit, Hôpital Saint-Antoine, Assistance Publique-Hôpitaux de Paris, 75571 Paris cedex 12, France
| | - Nina Nguyen
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, California, 94143
| | - Kevin Wilhelmsen
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, California, 94143
| | - Judith Hellman
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, California, 94143
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McCoy MG, Nascimento DW, Veleeparambil M, Murtazina R, Gao D, Tkachenko S, Podrez E, Byzova TV. Endothelial TLR2 promotes proangiogenic immune cell recruitment and tumor angiogenesis. Sci Signal 2021; 14. [PMID: 33986920 DOI: 10.1126/scisignal.abc5371] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Toll-like receptor 2 (TLR2) is implicated in various pathologies, mainly in terms of its function within innate immune cells. However, TLR2 is also present in endothelial cells. Here, we explored the physiological and pathophysiological roles of endothelial TLR2 signaling. We found that TLR2 was highly abundant in the endothelium within various tissues using TLR2-IRES-EGFP reporter mice and was required for proinflammatory endothelial cell function. Endothelial cells lacking TLR2 exhibited reduced proinflammatory potential at the protein, cell, and tissue levels. Loss of endothelial TLR2 blunted the inflammatory response to both exogenous and endogenous danger signals in endothelial cells in culture and in vivo. Endothelial TLR2 promoted tumor growth, angiogenesis, and protumorigenic immune cell recruitment in a mouse model of prostate cancer. Furthermore, the cell surface localization of P-selectin and the subsequent production of other critical cell adhesion molecules (such as E-selectin, ICAM-1 and VCAM-1) that recruit immune cells required endothelial TLR2. Our findings demonstrate that endothelial cells actively contribute to innate immune pathways and propose that endothelial TLR2 has a pathological role in proinflammatory conditions.
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Affiliation(s)
- Michael G McCoy
- Department of Neuroscience, Lerner Research Institute, Cleveland Clinic, OH, USA 44195
| | - Daniel W Nascimento
- Department of Neuroscience, Lerner Research Institute, Cleveland Clinic, OH, USA 44195
| | - Manoj Veleeparambil
- Department of Neuroscience, Lerner Research Institute, Cleveland Clinic, OH, USA 44195
| | - Rakhylia Murtazina
- Department of Neuroscience, Lerner Research Institute, Cleveland Clinic, OH, USA 44195
| | - Detao Gao
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, OH, USA 44195
| | - Svyatoslav Tkachenko
- Department of Quantitative Health Sciences, Lerner Research Institute, Cleveland Clinic, OH, USA 44195
| | - Eugene Podrez
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, OH, USA 44195
| | - Tatiana V Byzova
- Department of Neuroscience, Lerner Research Institute, Cleveland Clinic, OH, USA 44195
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Toll-Like Receptor 2 at the Crossroad between Cancer Cells, the Immune System, and the Microbiota. Int J Mol Sci 2020; 21:ijms21249418. [PMID: 33321934 PMCID: PMC7763461 DOI: 10.3390/ijms21249418] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 12/03/2020] [Accepted: 12/08/2020] [Indexed: 12/16/2022] Open
Abstract
Toll-like receptor 2 (TLR2) expressed on myeloid cells mediates the recognition of harmful molecules belonging to invading pathogens or host damaged tissues, leading to inflammation. For this ability to activate immune responses, TLR2 has been considered a player in anti-cancer immunity. Therefore, TLR2 agonists have been used as adjuvants for anti-cancer immunotherapies. However, TLR2 is also expressed on neoplastic cells from different malignancies and promotes their proliferation through activation of the myeloid differentiation primary response protein 88 (MyD88)/nuclear factor kappa-light-chain-enhancer of activated B cell (NF-κB) pathway. Furthermore, its activation on regulatory immune cells may contribute to the generation of an immunosuppressive microenvironment and of the pre-metastatic niche, promoting cancer progression. Thus, TLR2 represents a double-edge sword, whose role in cancer needs to be carefully understood for the setup of effective therapies. In this review, we discuss the divergent effects induced by TLR2 activation in different immune cell populations, cancer cells, and cancer stem cells. Moreover, we analyze the stimuli that lead to its activation in the tumor microenvironment, addressing the role of danger, pathogen, and microbiota-associated molecular patterns and their modulation during cancer treatments. This information will contribute to the scientific debate on the use of TLR2 agonists or antagonists in cancer treatment and pave the way for new therapeutic avenues.
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Kim SY, Shin JS, Chung KS, Han HS, Lee HH, Lee JH, Kim SY, Ji YW, Ha Y, Kang J, Rhee YK, Lee KT. Immunostimulatory Effects of Live Lactobacillus sakei K040706 on the CYP-Induced Immunosuppression Mouse Model. Nutrients 2020; 12:nu12113573. [PMID: 33266362 PMCID: PMC7700367 DOI: 10.3390/nu12113573] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 11/20/2020] [Accepted: 11/20/2020] [Indexed: 12/12/2022] Open
Abstract
Our previous studies have shown that heat-killed Lactobacillus sakei K040706 exerts immunostimulatory and anti-inflammatory activities in macrophages, cyclophosphamide (CYP)-treated mice, and dextran sulfate sodium–induced colitis mice. However, the immunostimulatory effects of live Lactobacillus sakei K040706 (live K040706) against CYP-induced immunosuppression and its underlying molecular mechanisms remain unknown. Therefore, we investigated the immunostimulatory effects of live K040706 (108 or 109 colony forming unit (CFU)/day, p.o.) in CYP-induced immunosuppressed mice. Oral administration of live K040706 prevented the CYP-induced decreases in body weight, thymus index, natural killer (NK) cell activity, T and B cell proliferation, and cytokine (interferon (IFN)-γ, interleukin (IL)-2, and IL-12) production. The administration of live K040706 also exerted positive effects on the gut microbiota of CYP-induced mice, resulting in a microbiota composition similar to that of normal mice. Moreover, live K040706 significantly enhanced IL-6 and granulocyte-macrophage colony-stimulating factor (GM-CSF) production in the splenocytes and Peyer’s patch (PP) cells of mice and increased bone marrow (BM) cell proliferation. Taken together, our data indicate that live K040706 may effectively accelerate recovery from CYP-induced immunosuppression, leading to activation of the immune system. Therefore, live K040706 may serve as a potential immunomodulatory agent against immunosuppression.
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Affiliation(s)
- Seo-Yeon Kim
- Department of Pharmaceutical Biochemistry, College of Pharmacy Kyung Hee University, Seoul 02447, Korea; (S.-Y.K.); (J.-S.S.); (K.-S.C.); (H.-S.H.); (H.-H.L.); (J.-H.L.); (S.-Y.K.)
- Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, Seoul 02447, Korea
| | - Ji-Sun Shin
- Department of Pharmaceutical Biochemistry, College of Pharmacy Kyung Hee University, Seoul 02447, Korea; (S.-Y.K.); (J.-S.S.); (K.-S.C.); (H.-S.H.); (H.-H.L.); (J.-H.L.); (S.-Y.K.)
| | - Kyung-Sook Chung
- Department of Pharmaceutical Biochemistry, College of Pharmacy Kyung Hee University, Seoul 02447, Korea; (S.-Y.K.); (J.-S.S.); (K.-S.C.); (H.-S.H.); (H.-H.L.); (J.-H.L.); (S.-Y.K.)
| | - Hee-Soo Han
- Department of Pharmaceutical Biochemistry, College of Pharmacy Kyung Hee University, Seoul 02447, Korea; (S.-Y.K.); (J.-S.S.); (K.-S.C.); (H.-S.H.); (H.-H.L.); (J.-H.L.); (S.-Y.K.)
- Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, Seoul 02447, Korea
| | - Hwi-Ho Lee
- Department of Pharmaceutical Biochemistry, College of Pharmacy Kyung Hee University, Seoul 02447, Korea; (S.-Y.K.); (J.-S.S.); (K.-S.C.); (H.-S.H.); (H.-H.L.); (J.-H.L.); (S.-Y.K.)
| | - Jeong-Hun Lee
- Department of Pharmaceutical Biochemistry, College of Pharmacy Kyung Hee University, Seoul 02447, Korea; (S.-Y.K.); (J.-S.S.); (K.-S.C.); (H.-S.H.); (H.-H.L.); (J.-H.L.); (S.-Y.K.)
- Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, Seoul 02447, Korea
| | - Su-Yeon Kim
- Department of Pharmaceutical Biochemistry, College of Pharmacy Kyung Hee University, Seoul 02447, Korea; (S.-Y.K.); (J.-S.S.); (K.-S.C.); (H.-S.H.); (H.-H.L.); (J.-H.L.); (S.-Y.K.)
- Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, Seoul 02447, Korea
| | - Yong Woo Ji
- Department of Ophthalmology, National Health Insurance Service Ilsan Hospital, Goyang 10444, Korea;
- Institute of Vision Research, Department of Ophthalmology, Yonsei University College of Medicine, Seoul 03722, Korea
| | - Yejin Ha
- NOVAREX Co. Ltd., 94, Gangni 1-gil, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do 363-885, Korea; (Y.H.); (J.K.)
| | - Jooyeon Kang
- NOVAREX Co. Ltd., 94, Gangni 1-gil, Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do 363-885, Korea; (Y.H.); (J.K.)
| | - Young Kyoung Rhee
- Korea Food Research Institute, Wanju-gun, Jeollabuk-do 55365, Korea;
| | - Kyung-Tae Lee
- Department of Pharmaceutical Biochemistry, College of Pharmacy Kyung Hee University, Seoul 02447, Korea; (S.-Y.K.); (J.-S.S.); (K.-S.C.); (H.-S.H.); (H.-H.L.); (J.-H.L.); (S.-Y.K.)
- Department of Life and Nanopharmaceutical Sciences, Graduate School, Kyung Hee University, Seoul 02447, Korea
- Correspondence: ; Tel.: +82-2-961-0860; Fax: +82-2-961-0356
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11
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Bryant AG, Hu M, Carlyle BC, Arnold SE, Frosch MP, Das S, Hyman BT, Bennett RE. Cerebrovascular Senescence Is Associated With Tau Pathology in Alzheimer's Disease. Front Neurol 2020; 11:575953. [PMID: 33041998 PMCID: PMC7525127 DOI: 10.3389/fneur.2020.575953] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Accepted: 08/12/2020] [Indexed: 12/21/2022] Open
Abstract
Alzheimer's Disease (AD) is associated with neuropathological changes, including aggregation of tau neurofibrillary tangles (NFTs) and amyloid-beta plaques. Mounting evidence indicates that vascular dysfunction also plays a key role in the pathogenesis and progression of AD, in part through endothelial dysfunction. Based on findings in animal models that tau pathology induces vascular abnormalities and cellular senescence, we hypothesized that tau pathology in the human AD brain leads to vascular senescence. To explore this hypothesis, we isolated intact microvessels from the dorsolateral prefrontal cortex (PFC, BA9) from 16 subjects with advanced Braak stages (Braak V/VI, B3) and 12 control subjects (Braak 0/I/II, B1), and quantified expression of 42 genes associated with senescence, cell adhesion, and various endothelial cell functions. Genes associated with endothelial senescence and leukocyte adhesion, including SERPINE1 (PAI-1), CXCL8 (IL8), CXCL1, CXCL2, ICAM-2, and TIE1, were significantly upregulated in B3 microvessels after adjusting for sex and cerebrovascular pathology. In particular, the senescence-associated secretory phenotype genes SERPINE1 and CXCL8 were upregulated by more than 2-fold in B3 microvessels after adjusting for sex, cerebrovascular pathology, and age at death. Protein quantification data from longitudinal plasma samples for a subset of 13 (n = 9 B3, n = 4 B1) subjects showed no significant differences in plasma senescence or adhesion-associated protein levels, suggesting that these changes were not associated with systemic vascular alterations. Future investigations of senescence biomarkers in both the peripheral and cortical vasculature could further elucidate links between tau pathology and vascular changes in human AD.
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Affiliation(s)
- Annie G Bryant
- Department of Neurology, Harvard Medical School, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Charlestown, MA, United States
| | - Miwei Hu
- Department of Neurology, Harvard Medical School, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Charlestown, MA, United States
| | - Becky C Carlyle
- Department of Neurology, Harvard Medical School, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Charlestown, MA, United States
| | - Steven E Arnold
- Department of Neurology, Harvard Medical School, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Charlestown, MA, United States
| | - Matthew P Frosch
- Department of Neurology, Harvard Medical School, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Charlestown, MA, United States.,Department of Pathology, Harvard Medical School, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Charlestown, MA, United States
| | - Sudeshna Das
- Department of Neurology, Harvard Medical School, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Charlestown, MA, United States
| | - Bradley T Hyman
- Department of Neurology, Harvard Medical School, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Charlestown, MA, United States
| | - Rachel E Bennett
- Department of Neurology, Harvard Medical School, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Charlestown, MA, United States
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12
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Bhagwani A, Thompson AAR, Farkas L. When Innate Immunity Meets Angiogenesis-The Role of Toll-Like Receptors in Endothelial Cells and Pulmonary Hypertension. Front Med (Lausanne) 2020; 7:352. [PMID: 32850883 PMCID: PMC7410919 DOI: 10.3389/fmed.2020.00352] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 06/12/2020] [Indexed: 01/16/2023] Open
Abstract
Toll-like receptors serve a central role in innate immunity, but they can also modulate cell function in various non-immune cell types including endothelial cells. Endothelial cells are necessary for the organized function of the vascular system, and part of their fundamental role is also the regulation of immune function and inflammation. In this review, we summarize the current knowledge of how Toll-like receptors contribute to the immune and non-immune functions of the endothelial cells.
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Affiliation(s)
- Aneel Bhagwani
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, Davis Heart & Lung Research Institute, The Ohio State University, Columbus, OH, United States
- Department of Physiology and Biophysics, Virginia Commonwealth University, Richmond, VA, United States
| | - A. A. Roger Thompson
- Department of Infection, Immunity & Cardiovascular Disease, Faculty of Medicine, Dentistry & Health, University of Sheffield, Sheffield, United Kingdom
| | - Laszlo Farkas
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, Davis Heart & Lung Research Institute, The Ohio State University, Columbus, OH, United States
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13
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Zhang R, Rai U, Ibrahim NBM, Amazouz Y, Soo J, Conroy AL, Namasopo S, Opoka RO, Bhargava R, Hawkes MT. Dysregulation of angiopoietin-Tie-2 axis in ugandan children hospitalized with pneumonia. Cytokine 2020; 133:155175. [PMID: 32599540 DOI: 10.1016/j.cyto.2020.155175] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 04/20/2020] [Accepted: 06/10/2020] [Indexed: 12/17/2022]
Abstract
OBJECTIVE Pneumonia is the leading cause of death in children under 5, with the highest burden in resource-limited countries. Endothelial activation occurs in pneumonia and can be assessed using quantitative levels of biomarkers angiopoietin (Ang)-1 and Ang-2. We examined admission levels of Ang-1 and Ang-2 in pediatric pneumonia and their association with disease severity and outcome. METHODS Prospective cohort study of children with hypoxemic pneumonia admitted to two hospitals in Uganda. Clinical, radiographic, and microbiologic characteristics were measured at admission. Disease severity was assessed using the Respiratory Index of Severity in Children (RISC). Plasma levels of Ang-1 and Ang-2 were quantified by enzyme-linked immunosorbent assay. Vital signs, oxygen supplementation, and mortality were assessed prospectively. RESULTS We included 65 patients (43% female) with median age 19 months (IQR 8-24). Admission Ang-2/Ang-1 ratio directly correlated with RISC (ρ = 0.32, p = 0.008) and lactate level (ρ = 0.48, p < 0.001). Ang-2/Ang-1 ratio was higher in pneumococcal pneumonia than viral RTI (0.19 [IQR: 0.076-0.54] vs. 0.078 [IQR: 0.027-0.11]; p = 0.03). Elevated Ang-2/Ang-1 ratio (>0.084) was associated with prolonged tachypnea (HR 0.50 (95%CI 0.29-0.87), p = 0.02), fever (HR 0.56 (95%CI 0.33 to 0.96), p = 0.02), longer duration of oxygen therapy (HR 0.59 (95%CI 0.35-0.99), p = 0.04), and hospital stay (HR 0.43 (95%CI 0.25-0.74), p = 0.001). The Ang-2/Ang-1 ratio at admission was higher in fatal cases relative to survivors (0.36 [IQR: 0.17-0.58] vs. 0.077 [IQR: 0.025-0.19]; p = 0.05) CONCLUSION: Endothelial activation in hypoxemic pediatric pneumonia, reflected by high plasma Ang-2/Ang-1 ratio, is associated with disease severity, prolonged recovery time, and mortality.
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Affiliation(s)
- Ran Zhang
- Department of Pediatrics, University of Alberta, Edmonton, Canada
| | - Urvi Rai
- Department of Pediatrics, University of Alberta, Edmonton, Canada
| | | | - Yanni Amazouz
- Department of Pediatrics, University of Alberta, Edmonton, Canada
| | - Jeremy Soo
- Department of Pediatrics, University of Alberta, Edmonton, Canada
| | - Andrea L Conroy
- Ryan White Center for Pediatric Infectious Diseases and Global Health, Indiana University School of Medicine, Indianapolis, USA
| | - Sophie Namasopo
- Department of Paediatrics, Jinja Regional Referral Hospital, Uganda
| | - Robert O Opoka
- Department of Paediatrics and Child Health, Mulago Hospital and Makerere University, Kampala, Uganda
| | - Ravi Bhargava
- Department of Radiology and Diagnostic Imaging, University of Alberta
| | - Michael T Hawkes
- Department of Pediatrics, University of Alberta, Canada; Department of Medical Microbiology and Immunology, University of Alberta, Edmonton, Canada; School of Public Health, University of Alberta, Edmonton, Canada; Distinguished Researcher, Stollery Science Lab, Canada; Member, Women and Children's Health Research Institute, Canada.
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14
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Bleuzé M, Auger JP, Lavagna A, Gisch N, Gottschalk M, Segura M. In vitro characterization of granulocyte-colony stimulating factor (G-CSF) production by dendritic cells and macrophages during Streptococcus suis infection. Immunobiology 2020; 225:151979. [PMID: 32747024 DOI: 10.1016/j.imbio.2020.151979] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 06/08/2020] [Accepted: 06/16/2020] [Indexed: 12/26/2022]
Abstract
Streptococcus suis serotype 2 is an important porcine bacterial pathogen and emerging zoonotic agent. Infections induce an exacerbated inflammation that can result in sudden death (septic shock) and meningitis. Though neutrophilic leukocytosis characterizes S. suis infection, the mediators involved are poorly understood. Among them, granulocyte-colony stimulating factor (G-CSF), a pro-inflammatory cytokine, triggers proliferation of neutrophil progenitors and neutrophil mobilization. However, the systemic production of G-CSF induced during S. suis infection, the cell types involved, and the underlying mechanisms remain unknown. In a S. suis serotype 2 mouse model of systemic infection, plasma levels of G-CSF rapidly increased after infection. S. suis activation of DCs and macrophages resulted in high (> 1000 pg/mL) and comparable production levels of G-CSF, as measured by ELISA. By using mutant strains deficient in capsular polysaccharide (CPS) or lipoprotein maturation in combination with purified lipoteichoic acid (LTA) from the latter mutant strain, it was showed that G-CSF production is mainly mediated by S. suis lipoproteins. The Toll-like receptor (TLR) pathway via myeloid differentiation primary response 88 (MyD88) is required for G-CSF production by DCs and macrophages following S. suis activation, with a partial involvement of TLR2. On the other hand, TLR2-independant G-CSF production induced by S. suis requires internalization and bacterial DNA might play a role in this pathway. Finally, these signals activated nuclear factor-kappa B (NF-κB) and mitogen-activated protein kinase (MAPK) pathways leading to G-CSF production. In conclusion, this study demonstrated for the first time that S. suis induces G-CSF production in vivo and DCs and macrophages are key cellular sources of this cytokine mediator, mainly via the binding of lipoproteins to TLR2. The CPS significantly reduced this activation, confirming the powerful role of this component in S. suis virulence. As such, this study contributes to better understand how DCs and macrophages produce G-CSF in response to S. suis, and potentially to other streptococci.
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Affiliation(s)
- Marêva Bleuzé
- Research Group on Infectious Diseases in Production Animals (GREMIP) & Swine and Poultry Infectious Diseases Research Center (CRIPA), Faculty of Veterinary Medicine, University of Montreal, Saint-Hyacinthe, J2S 2M2, QC, Canada
| | - Jean-Philippe Auger
- Research Group on Infectious Diseases in Production Animals (GREMIP) & Swine and Poultry Infectious Diseases Research Center (CRIPA), Faculty of Veterinary Medicine, University of Montreal, Saint-Hyacinthe, J2S 2M2, QC, Canada
| | - Agustina Lavagna
- Research Group on Infectious Diseases in Production Animals (GREMIP) & Swine and Poultry Infectious Diseases Research Center (CRIPA), Faculty of Veterinary Medicine, University of Montreal, Saint-Hyacinthe, J2S 2M2, QC, Canada
| | - Nicolas Gisch
- Division of Bioanalytical Chemistry, Priority Area Infections, Research Center Borstel, Leibniz Lung Center, Borstel, Germany
| | - Marcelo Gottschalk
- Research Group on Infectious Diseases in Production Animals (GREMIP) & Swine and Poultry Infectious Diseases Research Center (CRIPA), Faculty of Veterinary Medicine, University of Montreal, Saint-Hyacinthe, J2S 2M2, QC, Canada
| | - Mariela Segura
- Research Group on Infectious Diseases in Production Animals (GREMIP) & Swine and Poultry Infectious Diseases Research Center (CRIPA), Faculty of Veterinary Medicine, University of Montreal, Saint-Hyacinthe, J2S 2M2, QC, Canada.
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15
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Pretreatment with interleukin 35-engineered mesenchymal stem cells protected against lipopolysaccharide-induced acute lung injury via pulmonary inflammation suppression. Inflammopharmacology 2020; 28:1269-1281. [PMID: 32170527 PMCID: PMC7095386 DOI: 10.1007/s10787-020-00696-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Accepted: 02/17/2020] [Indexed: 12/19/2022]
Abstract
Acute lung injury (ALI)-triggered pulmonary injury has been associated with high mortality, despite advances in drug treatment and supportive therapy. Remarkable progress has been made in attenuating the inflammatory injury associated with ALI using mesenchymal stem cells (MSCs)-based cell and gene therapy. However, to date, the benefits of interleukin-35 (IL-35)-modified MSCs in ALI intervention have not been investigated. In the present study, adult male C57BL/6 mice randomly received intravenous infusion of adipose-derived mesenchymal stem cells (ADSCs) constitutively expressing IL-35 (IL-35-GFP-ADSCs) or GFP (GFP-ADSCs) via retrovirus-mediated transduction (8 × 105 cells per mice) or isotonic saline 7 days before ALI modeling to investigate the effect and related mechanism. ALI was performed by lipopolysaccharide (LPS) inhalation for 24 h. Normal mice served as the sham group. The results indicated that compared with GFP-ADSCs, IL-35-modified ADSCs significantly increased cellular and pulmonary IL-10 and IL-35 production. Pretreatment with IL-35-ADSCs markedly reduced body weight loss, pulmonary wet/dry weight ratio and pathological injury. The PO2 was rescued to normal levels in mice that received IL-35-ADSCs. IL-35-ADSCs infusion apparently inhibited IL-6 release, protein leakage and MPO activity but greatly elevated IL-35 level in the bronchoalveolar lavage fluid (BALF). Splenic regulatory T cells in IL-35-ADSCs-pretreated mice got effective increase. Moreover, IL-35-ADSCs pretreatment remarkably inhibited neutrophil and macrophage infiltration and greatly decreased IL-6, tumor necrosis factor α (TNF-α) and Toll-like receptor 4 (TLR4) expression. In conclusion, pretreatment with IL-35-engineered ADSCs provided effective protection against LPS-induced ALI through suppression of pulmonary inflammation and, thus, might be a promising strategy to improve outcomes after ALI. The enhanced paracrine and immunosuppressive capacity of IL-35-ADSCs might contribute to their beneficial effects. However, further studies are needed to illuminate the detailed mechanism.
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16
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Judith Hellman, M.D., Recipient of the 2019 Excellence in Research Award. Anesthesiology 2019. [DOI: 10.1097/aln.0000000000002903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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17
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Patra MC, Shah M, Choi S. Toll-like receptor-induced cytokines as immunotherapeutic targets in cancers and autoimmune diseases. Semin Cancer Biol 2019; 64:61-82. [PMID: 31054927 DOI: 10.1016/j.semcancer.2019.05.002] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Revised: 04/27/2019] [Accepted: 05/01/2019] [Indexed: 12/14/2022]
Abstract
Immune cells of the myeloid and lymphoid lineages express Toll-like receptors (TLRs) to recognize pathogenic components or cellular debris and activate the immune system through the secretion of cytokines. Cytokines are signaling molecules that are structurally and functionally distinct from one another, although their secretion profiles and signaling cascades often overlap. This situation gives rise to pleiotropic cell-to-cell communication pathways essential for protection from infections as well as cancers. Nonetheless, deregulated signaling can have detrimental effects on the host, in the form of inflammatory or autoimmune diseases. Because cytokines are associated with numerous autoimmune and cancerous conditions, therapeutic strategies to modulate these molecules or their biological responses have been immensely beneficial over the years. There are still challenges in the regulation of cytokine function in patients, even in those who take approved biological therapeutics. In this review, our purpose is to discuss the differential expression patterns of TLR-regulated cytokines and their cell type specificity that is associated with cancers and immune-system-related diseases. In addition, we highlight key structural features and molecular recognition of cytokines by receptors; these data have facilitated the development and approval of several biologics for the treatment of autoimmune diseases and cancers.
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Affiliation(s)
- Mahesh Chandra Patra
- Department of Molecular Science and Technology, Ajou University, Suwon, 16499, Republic of Korea
| | - Masaud Shah
- Department of Molecular Science and Technology, Ajou University, Suwon, 16499, Republic of Korea
| | - Sangdun Choi
- Department of Molecular Science and Technology, Ajou University, Suwon, 16499, Republic of Korea.
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18
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How Adhesion Molecule Patterns Change While Neutrophils Traffic through the Lung during Inflammation. Mediators Inflamm 2019; 2019:1208086. [PMID: 30944544 PMCID: PMC6421765 DOI: 10.1155/2019/1208086] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2018] [Revised: 12/13/2018] [Accepted: 12/20/2018] [Indexed: 02/06/2023] Open
Abstract
In acute pulmonary inflammation, polymorphonuclear cells (PMNs) pass a transendothelial barrier from the circulation into the lung interstitium followed by a transepithelial migration into the alveolar space. These migration steps are regulated differentially by a concept of adhesion molecules and remain-despite decades of research-incompletely understood. Current knowledge of changes in the expression pattern of adhesion molecules mainly derives from in vitro studies or from studies in extrapulmonary organ systems, where regulation of adhesion molecules differs significantly. In a murine model of lung inflammation, we determined the expression pattern of nine relevant neutrophilic adhesion molecules on their way through the different compartments of the lung. We used a flow cytometry-based technique that allowed describing spatial distribution of the adhesion molecules expressed on PMNs during their migration through the lung in detail. For example, the highest expression of CD29 was found in the intravascular compartment, highlighting its impact on the initial adhesion to the endothelium. CD47 showed its peak of expression on the later phase of transendothelial migration, whereas CD11b and CD54 expression peaked interstitial. A pivotal role for transepithelial migration was found for the adhesion molecule CD172a. Thereby, expression may correlate with functional impact for specific migration steps. In vitro studies further confirmed our in vivo findings. In conclusion, we are the first to determine the changes in expression patterns of relevant adhesion molecules on their migration through the different compartments of the lung. These findings may help to further understand the regulation of neutrophil trafficking in the lung.
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19
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Takehara M, Seike S, Sonobe Y, Bandou H, Yokoyama S, Takagishi T, Miyamoto K, Kobayashi K, Nagahama M. Clostridium perfringens α-toxin impairs granulocyte colony-stimulating factor receptor-mediated granulocyte production while triggering septic shock. Commun Biol 2019; 2:45. [PMID: 30729183 PMCID: PMC6355902 DOI: 10.1038/s42003-019-0280-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2018] [Accepted: 12/28/2018] [Indexed: 12/12/2022] Open
Abstract
During bacterial infection, granulocyte colony-stimulating factor (G-CSF) is produced and accelerates neutrophil production from their progenitors. This process, termed granulopoiesis, strengthens host defense, but Clostridium perfringens α-toxin impairs granulopoiesis via an unknown mechanism. Here, we tested whether G-CSF accounts for the α-toxin-mediated impairment of granulopoiesis. We find that α-toxin dramatically accelerates G-CSF production from endothelial cells in response to Toll-like receptor 2 (TLR2) agonists through activation of the c-Jun N-terminal kinase (JNK) signaling pathway. Meanwhile, α-toxin inhibits G-CSF-mediated cell proliferation of Ly-6G+ neutrophils by inducing degradation of G-CSF receptor (G-CSFR). During sepsis, administration of α-toxin promotes lethality and tissue injury accompanied by accelerated production of inflammatory cytokines in a TLR4-dependent manner. Together, our results illustrate that α-toxin disturbs G-CSF-mediated granulopoiesis by reducing the expression of G-CSFR on neutrophils while augmenting septic shock due to excess inflammatory cytokine release, which provides a new mechanism to explain how pathogenic bacteria modulate the host immune system.
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Affiliation(s)
- Masaya Takehara
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514 Japan
| | - Soshi Seike
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514 Japan
| | - Yuuta Sonobe
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514 Japan
| | - Hiroto Bandou
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514 Japan
| | - Saki Yokoyama
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514 Japan
| | - Teruhisa Takagishi
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514 Japan
| | - Kazuaki Miyamoto
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514 Japan
| | - Keiko Kobayashi
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514 Japan
| | - Masahiro Nagahama
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima, 770-8514 Japan
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20
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Yan X, Xie B, Wu G, Hu J, Wang D, Cai X, Li J. Interleukin-37: The Effect of Anti-Inflammatory Response in Human Coronary Artery Endothelial Cells. Mediators Inflamm 2019; 2019:2650590. [PMID: 30728750 PMCID: PMC6341264 DOI: 10.1155/2019/2650590] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 09/07/2018] [Accepted: 11/06/2018] [Indexed: 02/05/2023] Open
Abstract
Interleukin-37 (IL-37) is unique in the IL-1 family since it broadly suppresses innate immunity and elevates in humans with inflammatory and autoimmune diseases. IL-37 shows definite groups and transcripts for human IL37 gene, but it is still not completely understood the effect and mechanisms of inflammatory response in endothelial cells. It is well accepted that endothelial dysfunction caused by inflammation is a key initiating event in atherosclerotic plaque formation, which leads to the occurrence and development of the cardiovascular adverse events in clinical since the inflammatory responses of endothelial cells could induce and enhance the deposition of extensive lipid and the formation of atherosclerotic plaque in the intima. Thus, it is essential to investigate the role and potential mechanisms in endothelial inflammatory response to prevent the formation and development of many cardiovascular diseases including atherosclerosis. So far, the recent studies have revealed that IL-37 is able to inhibit inflammatory response by suppressing the TLR2-NF-κB-ICAM-1 pathway intracellularly in human coronary artery endothelial cells (HCAECs). Further, the role of IL-37 may be related to the IL-18 pathway extracellularly and involved in the adhesion and transmigration of neutrophils in HCAECs.
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Affiliation(s)
- Xianfeng Yan
- Department of Cardiology, First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong 515041, China
| | - Bin Xie
- Department of Cardiology, First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong 515041, China
| | - Guihai Wu
- Department of Cardiology, First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong 515041, China
| | - Jing Hu
- Department of Cardiology, Jiangxi Provincial People's Hospital, Nanchang, Jiangxi 330006, China
| | - Di Wang
- Department of Dermatovenereology, Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong 515041, China
| | - Xiangna Cai
- Department of Plastic Surgery, First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong 515041, China
| | - Jilin Li
- Department of Cardiology, First Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong 515041, China
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Juan C, Torrens G, Barceló IM, Oliver A. Interplay between Peptidoglycan Biology and Virulence in Gram-Negative Pathogens. Microbiol Mol Biol Rev 2018; 82:e00033-18. [PMID: 30209071 PMCID: PMC6298613 DOI: 10.1128/mmbr.00033-18] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The clinical and epidemiological threat of the growing antimicrobial resistance in Gram-negative pathogens, particularly for β-lactams, the most frequently used and relevant antibiotics, urges research to find new therapeutic weapons to combat the infections caused by these microorganisms. An essential previous step in the development of these therapeutic solutions is to identify their potential targets in the biology of the pathogen. This is precisely what we sought to do in this review specifically regarding the barely exploited field analyzing the interplay among the biology of the peptidoglycan and related processes, such as β-lactamase regulation and virulence. Hence, here we gather, analyze, and integrate the knowledge derived from published works that provide information on the topic, starting with those dealing with the historically neglected essential role of the Gram-negative peptidoglycan in virulence, including structural, biogenesis, remodeling, and recycling aspects, in addition to proinflammatory and other interactions with the host. We also review the complex link between intrinsic β-lactamase production and peptidoglycan metabolism, as well as the biological costs potentially associated with the expression of horizontally acquired β-lactamases. Finally, we analyze the existing evidence from multiple perspectives to provide useful clues for identifying targets enabling the future development of therapeutic options attacking the peptidoglycan-virulence interconnection as a key weak point of the Gram-negative pathogens to be used, if not to kill the bacteria, to mitigate their capacity to produce severe infections.
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Affiliation(s)
- Carlos Juan
- Servicio de Microbiología and Unidad de Investigación, Hospital Son Espases, Instituto de Investigación Sanitaria de Baleares (IdISBa), Palma, Spain
| | - Gabriel Torrens
- Servicio de Microbiología and Unidad de Investigación, Hospital Son Espases, Instituto de Investigación Sanitaria de Baleares (IdISBa), Palma, Spain
| | - Isabel Maria Barceló
- Servicio de Microbiología and Unidad de Investigación, Hospital Son Espases, Instituto de Investigación Sanitaria de Baleares (IdISBa), Palma, Spain
| | - Antonio Oliver
- Servicio de Microbiología and Unidad de Investigación, Hospital Son Espases, Instituto de Investigación Sanitaria de Baleares (IdISBa), Palma, Spain
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22
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Zhao X, Yin L, Fang L, Xu L, Sun P, Xu M, Liu K, Peng J. Protective effects of dioscin against systemic inflammatory response syndromevia adjusting TLR2/MyD88/NF‑κb signal pathway. Int Immunopharmacol 2018; 65:458-469. [PMID: 30390593 DOI: 10.1016/j.intimp.2018.10.036] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 09/30/2018] [Accepted: 10/25/2018] [Indexed: 12/14/2022]
Abstract
Development of active compounds to control inflammation against systemic inflammatory response syndrome (SIRS) is critical important. Dioscin shows anti-inflammatory effects in our previous works. However, the action of the compound on SIRS still remained unknown. In the present paper, zymosan induced generalized inflammation (ZIGI) models in mice and rats, and PMA-differentiated THP‑1 cells stimulated by lipopolysaccharide (LPS) and Pam3-Cys-Ser-Lys4 (Pam3CSK4) were used. The results showed that dioscin significantly inhibited the proliferation of THP‑1 cells stimulated by LPS and Pam3CSK4, obviously reduced the soakage of inflammatory cells and necrosis in liver, kidney and intestine of rats and mice, and reduced peritoneal ascites fluid compared with ZIGI model groups. In addition, dioscin significantly declined the levels of alanine transaminase (ALT), aspartate transaminase (AST), creatinine (Cr), blood urea nitrogen (BUN), malondialdehyde (MDA) and myeloperoxidase (MPO), increased the levels of superoxide dismutase (SOD) in rats and mice. The migration of macrophages in tissues was also suppressed by dioscin. Mechanism investigation showed that dioscin significantly inhibited the expression levels of TLR2, MyD88, NF‑κb, HMGB‑1, increased the expression levels of IKBα, and decreased the mRNA levels of interleukin‑1 beta (IL‑1β), interleukin‑6 (IL‑6) and tumor necrosis factor‑alpha (TNF‑α) in liver, kidney, intestine tissues of rats and mice, and in PMA-differentiated THP‑1 cells, which were further confirmed by TLR2 siRNA silencing in vitro. In conclusion, our data confirmed that dioscin exhibited protective effects against SIRS via adjusting TLR2/MyD88 signal pathway, which should be developed as one potent candidate to treat SIRS in the future.
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Affiliation(s)
- Xuerong Zhao
- College of Pharmacy, Dalian Medical University, Western 9 Lvshun nan Road, Dalian 116044, China
| | - Lianhong Yin
- College of Pharmacy, Dalian Medical University, Western 9 Lvshun nan Road, Dalian 116044, China
| | - Lingling Fang
- College of Pharmacy, Dalian Medical University, Western 9 Lvshun nan Road, Dalian 116044, China
| | - Lina Xu
- College of Pharmacy, Dalian Medical University, Western 9 Lvshun nan Road, Dalian 116044, China
| | - Pengyuan Sun
- College of Pharmacy, Dalian Medical University, Western 9 Lvshun nan Road, Dalian 116044, China
| | - Ming Xu
- College of Pharmacy, Dalian Medical University, Western 9 Lvshun nan Road, Dalian 116044, China
| | - Kexin Liu
- College of Pharmacy, Dalian Medical University, Western 9 Lvshun nan Road, Dalian 116044, China
| | - Jinyong Peng
- College of Pharmacy, Dalian Medical University, Western 9 Lvshun nan Road, Dalian 116044, China.
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Gai X, Jiang Z, Liu M, Li Q, Wang S, Li T, Pan W, Yang X. Therapeutic Effect of a Novel Nano-Drug Delivery System on Membranous Glomerulonephritis Rat Model Induced by Cationic Bovine Serum. AAPS PharmSciTech 2018; 19:2195-2202. [PMID: 29725902 DOI: 10.1208/s12249-018-1034-z] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 04/23/2018] [Indexed: 01/10/2023] Open
Abstract
In order to explore a novel high efficacy drug delivery system for membranous glomerulonephritis (MGN), a complex chronic inflammation, methylprednisolone bovine serum albumin nanoparticles (ME BSA NPs) were designed. The nanoparticles were prepared by desolvation-chemical crosslinking method and its physicochemical characterizations were conducted. The experimental MGN rat models induced by cationic bovine serum albumin were established by a modified Border's method and applied in the pharmacodynamics study of ME BSA NPs. The results showed that the particle size, particle dispersion index, and entrapment efficiency of ME BSA NPs were 131.1 ± 3.4 nm, 0.159 ± 0.036, and 71.51 ± 1.74%, respectively. In addition, the image of transmission electron microscopy showed that the ME BSA NPs were the relatively uniform spherical particles. In the in vivo pharmacodynamics study, compared with saline group and SOLU-MEDROL® group, that the ME BSA NPs group was significantly reduced the levels of 24 h urinary protein (P < 0.01) and serum creatinine (P < 0.05). Consequently, these outcomes indicated that the nanoparticles we studied were a promising drug delivery system for the MGN disease, and it may be also useful for other complex chronic inflammations.
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Toll-like receptors in immunity and inflammatory diseases: Past, present, and future. Int Immunopharmacol 2018; 59:391-412. [PMID: 29730580 PMCID: PMC7106078 DOI: 10.1016/j.intimp.2018.03.002] [Citation(s) in RCA: 403] [Impact Index Per Article: 67.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Revised: 02/28/2018] [Accepted: 03/01/2018] [Indexed: 02/07/2023]
Abstract
The immune system is a very diverse system of the host that evolved during evolution to cope with various pathogens present in the vicinity of environmental surroundings inhabited by multicellular organisms ranging from achordates to chordates (including humans). For example, cells of immune system express various pattern recognition receptors (PRRs) that detect danger via recognizing specific pathogen-associated molecular patterns (PAMPs) and mount a specific immune response. Toll-like receptors (TLRs) are one of these PRRs expressed by various immune cells. However, they were first discovered in the Drosophila melanogaster (common fruit fly) as genes/proteins important in embryonic development and dorso-ventral body patterning/polarity. Till date, 13 different types of TLRs (TLR1-TLR13) have been discovered and described in mammals since the first discovery of TLR4 in humans in late 1997. This discovery of TLR4 in humans revolutionized the field of innate immunity and thus the immunology and host-pathogen interaction. Since then TLRs are found to be expressed on various immune cells and have been targeted for therapeutic drug development for various infectious and inflammatory diseases including cancer. Even, Single nucleotide polymorphisms (SNPs) among various TLR genes have been identified among the different human population and their association with susceptibility/resistance to certain infections and other inflammatory diseases. Thus, in the present review the current and future importance of TLRs in immunity, their pattern of expression among various immune cells along with TLR based therapeutic approach is reviewed. TLRs are first described PRRs that revolutionized the biology of host-pathogen interaction and immune response The discovery of different TLRs in humans proved milestone in the field of innate immunity and inflammation The pattern of expression of all the TLRs expressed by human immune cells An association of various TLR SNPs with different inflammatory diseases Currently available drugs or vaccines based on TLRs and their future in drug targeting along with the role in reproduction, and regeneration
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Wallet SM, Puri V, Gibson FC. Linkage of Infection to Adverse Systemic Complications: Periodontal Disease, Toll-Like Receptors, and Other Pattern Recognition Systems. Vaccines (Basel) 2018; 6:E21. [PMID: 29621153 PMCID: PMC6027258 DOI: 10.3390/vaccines6020021] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 03/25/2018] [Accepted: 03/30/2018] [Indexed: 12/13/2022] Open
Abstract
Toll-like receptors (TLRs) are a group of pattern recognition receptors (PRRs) that provide innate immune sensing of conserved pathogen-associated molecular patterns (PAMPs) to engage early immune recognition of bacteria, viruses, and protozoa. Furthermore, TLRs provide a conduit for initiation of non-infectious inflammation following the sensing of danger-associated molecular patterns (DAMPs) generated as a consequence of cellular injury. Due to their essential role as DAMP and PAMP sensors, TLR signaling also contributes importantly to several systemic diseases including cardiovascular disease, diabetes, and others. The overlapping participation of TLRs in the control of infection, and pathogenesis of systemic diseases, has served as a starting point for research delving into the poorly defined area of infection leading to increased risk of various systemic diseases. Although conflicting studies exist, cardiovascular disease, diabetes, cancer, rheumatoid arthritis, and obesity/metabolic dysfunction have been associated with differing degrees of strength to infectious diseases. Here we will discuss elements of these connections focusing on the contributions of TLR signaling as a consequence of bacterial exposure in the context of the oral infections leading to periodontal disease, and associations with metabolic diseases including atherosclerosis and type 2 diabetes.
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Affiliation(s)
- Shannon M Wallet
- Department of Oral Biology, College of Dental Medicine, University of Florida, Gainesville, FL 32610, USA.
| | - Vishwajeet Puri
- Department of Biomedical Sciences and Diabetes Institute, Ohio University, Athens, OH 45701, USA.
| | - Frank C Gibson
- Department of Oral Biology, College of Dental Medicine, University of Florida, Gainesville, FL 32610, USA.
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Sessile Innate Immune Cells. DAMAGE-ASSOCIATED MOLECULAR PATTERNS IN HUMAN DISEASES 2018. [PMCID: PMC7123606 DOI: 10.1007/978-3-319-78655-1_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In this chapter, sessile cells of the innate immune system are briefly introduced. Defined as cells equipped with diverse pattern recognition molecules capable of detecting MAMPs and DAMPs, they encompass cells such as epithelial cells, fibroblasts, vascular cells, chondrocytes, osteoblasts, and adipocytes. Located at the body surfaces, epithelial cells represent the first line of innate immune defense against invading microbial pathogens. They are significant contributors to innate mucosal immunity and generate various antimicrobial defense mechanisms. Also, epithelial cells critically contribute to tissue repair via the phenomenon of re-epithelialization. Fibroblasts operate as classical sentinel cells of the innate immune system dedicated to responding to MAMPs and DAMPs emitted upon any tissue injury. Typically, fibroblasts synthesize most of the extracellular matrix of connective tissues, thereby playing a crucial role in tissue repair processes. Vascular cells of the innate immune system represent an evolutionarily developed first-line defense against any inciting insult hitting the vessel walls from the luminal side including bacteria, viruses, microbial toxins, and chemical noxa such as nicotine. Upon such insults and following recognition of MAMPs and DAMPs, vascular cells react with an innate immune response to create an acute inflammatory milieu in the vessel wall aimed at curing the vascular injury concerned. Chondrocytes, osteoblasts, and osteoclasts represent other vital cells of the skeletal system acting as cells of the innate immune system in its wider sense. These cells mediate injury-promoted DAMP-induced inflammatory and regenerative processes specific for the skeletal systems. Finally, adipocytes are regarded as highly active cells of the innate immune system. As white, brown, and beige adipocytes, they operate as a dynamic metabolic organ that can secrete certain bioactive molecules which have endocrine, paracrine, and autocrine actions.
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Umeda K, Tanaka S, Ihara F, Yamagishi J, Suzuki Y, Nishikawa Y. Transcriptional profiling of Toll-like receptor 2-deficient primary murine brain cells during Toxoplasma gondii infection. PLoS One 2017; 12:e0187703. [PMID: 29136637 PMCID: PMC5685635 DOI: 10.1371/journal.pone.0187703] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Accepted: 10/24/2017] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND Toxoplasma gondii is capable of persisting in the brain, although it is efficiently eliminated by cellular immune responses in most other sites. While Toll-like receptor 2 (TLR2) reportedly plays important roles in protective immunity against the parasite, the relationship between neurological disorders induced by T. gondii infection and TLR2 function in the brain remains controversial with many unknowns. In this study, primary cultured astrocytes, microglia, neurons, and peritoneal macrophages obtained from wild-type and TLR2-deficient mice were exposed to T. gondii tachyzoites. To characterize TLR2-dependent functional pathways activated in response to T. gondii infection, gene expression of different cell types was profiled by RNA sequencing. RESULTS During T. gondii infection, a total of 611, 777, 385, and 1105 genes were upregulated in astrocytes, microglia, neurons, and macrophages, respectively, while 163, 1207, 158, and 1274 genes were downregulated, respectively, in a TLR2-dependent manner. Overrepresented Gene Ontology (GO) terms for TLR2-dependently upregulated genes were associated with immune and stress responses in astrocytes, immune responses and developmental processes in microglia, metabolic processes and immune responses in neurons, and metabolic processes and gene expression in macrophages. Overrepresented GO terms for downregulated genes included ion transport and behavior in astrocytes, cell cycle and cell division in microglia, metabolic processes in neurons, and response to stimulus, signaling and cell motility in macrophages. CONCLUSIONS To our knowledge, this is the first transcriptomic study of TLR2 function across different cell types during T. gondii infection. Results of RNA-sequencing demonstrated roles for TLR2 varied by cell type during T. gondii infection. Our findings facilitate understanding of the detailed relationship between TLR2 and T. gondii infection, and elucidate mechanisms underlying neurological changes during infection.
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Affiliation(s)
- Kousuke Umeda
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan
| | - Sachi Tanaka
- Division of Animal Science, Department of Agricultural and Life Sciences, Faculty of Agriculture, Shinshu University, Minamiminowa, Nagano, Japan
| | - Fumiaki Ihara
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan
| | - Junya Yamagishi
- Research Center for Zoonosis Control, Hokkaido University, Sapporo, Hokkaido, Japan
| | - Yutaka Suzuki
- Graduate School of Frontier Science, The University of Tokyo, Kashiwa, Chiba, Japan
| | - Yoshifumi Nishikawa
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido, Japan
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28
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Fan J, Yu L, Zhao J. Comparative transcriptome analysis reveals involvement of TLR-2 signaling in the pathogenesis of intracranial aneurysm. J Clin Neurosci 2017; 47:258-263. [PMID: 29066233 DOI: 10.1016/j.jocn.2017.07.016] [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: 10/06/2016] [Revised: 05/01/2017] [Accepted: 07/11/2017] [Indexed: 01/18/2023]
Abstract
In this study, we collected and analyzed 15 aneurysmal and 17 superficial temporal artery (STA) specimens from 32 Chinese patients with intracranial aneurysm. Total RNA was extracted and reverse transcribed to cDNA, and genome-wide expression profiling was performed by using the Affymetrix Human Genome U133 Plus 2.0 Array which allows a total number of 38,500 genes to be analyzed at the same time. Real-time RT-PCR was performed to verify the expression level of 8 selected genes. We found significant up-regulation of the TLR-2 gene. This result suggests that TLR-2 plays a key role in the formation of intracranial aneurysm in a Chinese population. To our knowledge, this study is the first to use the Human Genome U133 Plus 2.0 Array to analyze the gene expression profiles in Chinese patients with intracranial aneurysm.
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Affiliation(s)
- Jinghan Fan
- Department of Neurosurgery, Beijing Tiantan Hospital Affiliated to Capital Medical University, 6 Tiantan Xili, 100050 Beijing, China
| | - Lanbing Yu
- Department of Neurosurgery, Beijing Tiantan Hospital Affiliated to Capital Medical University, 6 Tiantan Xili, 100050 Beijing, China
| | - Jizong Zhao
- Department of Neurosurgery, Beijing Tiantan Hospital Affiliated to Capital Medical University, 6 Tiantan Xili, 100050 Beijing, China.
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Imhof BA, Jemelin S, Emre Y. Toll-like receptors elicit different recruitment kinetics of monocytes and neutrophils in mouse acute inflammation. Eur J Immunol 2017; 47:1002-1008. [PMID: 28299776 DOI: 10.1002/eji.201746983] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 03/03/2017] [Accepted: 03/13/2017] [Indexed: 01/21/2023]
Abstract
Leukocyte recruitment is an important process in combating pathogens. The largest class of circulating leukocytes are neutrophils, which rapidly invade inflamed tissue, followed by inflammatory Ly6C+ monocytes. Ly6Clow monocytes patrol the endothelial wall routinely in the steady state. We recently reported early luminal recruitment of Ly6Clow monocytes, which preceded and orchestrated neutrophil arrival and extravasation in response to TLR7/8-mediated vascular inflammation. Here we dissected the kinetics of recruitment of monocytes and neutrophils and examined the dynamics of Ly6Clow monocytes in response to several other Toll-like receptor (TLR) agonists, using intravital confocal microscopy. We observed two types of kinetics in mesenteric veins. TLR2, TLR5 and TLR9 agonists caused early monocyte and neutrophil influx whereas TLR3 and TLR4 agonists rapidly recruited neutrophils and caused Ly6Clow monocytes to arrive at low levels later on. All TLR agonists, except TLR9, led Ly6Clow monocytes to meticulously patrol the vascular wall. Finally, these monocytes released pro-inflammatory cytokines and chemokines implicated in neutrophil recruitment in response to TLR2, TLR4, and TLR9 stimulation but not to TLR3 and TLR5 agonists. These results refine our understanding of the early events in the leukocyte recruitment cascade, including the patrolling behavior of Ly6Clow monocytes, in TLR-mediated acute vascular inflammation.
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Affiliation(s)
- Beat A Imhof
- Department of Pathology and Immunology, University of Geneva, Switzerland
| | - Stephane Jemelin
- Department of Pathology and Immunology, University of Geneva, Switzerland
| | - Yalin Emre
- Department of Pathology and Immunology, University of Geneva, Switzerland
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30
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Takehara M, Seike S, Takagishi T, Kobayashi K, Nagahama M. Peptidoglycan accelerates granulopoiesis through a TLR2- and MyD88-dependent pathway. Biochem Biophys Res Commun 2017; 487:419-425. [PMID: 28419838 DOI: 10.1016/j.bbrc.2017.04.077] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 04/14/2017] [Indexed: 11/16/2022]
Abstract
Granulopoiesis is accelerated during Gram-negative bacterial infection through activation of toll-like receptor 4 (TLR4). In this study, we tested whether activation of TLR2 promotes granulopoiesis by using the well-known TLR2 agonist, peptidoglycan (PGN). Neutrophils in bone marrow and spleen, and plasma granulocyte colony-stimulating factor (G-CSF) were increased in mice that had received intraperitoneal PGN administration. Incorporation of BrdU into bone marrow neutrophils increased, demonstrating that PGN accelerated granulopoiesis. Treatment of bone marrow cells (BMCs) with PGN increased neutrophils in vitro and promoted the secretion of G-CSF from Ly-6G-Ly-6C+ monocytes. The accelerated granulopoiesis caused by PGN was not seen in TLR2-deficient and MyD88-deficient BMCs. Additionally, PGN induced G-CSF production in human umbilical vein endothelial cells. These findings demonstrate that PGN promotes the secretion of G-CSF from monocytes and endothelial cells, leading to the acceleration of granulopoiesis. Our results illustrate that bacterial recognition by TLR2 facilitates granulopoiesis during Gram-positive bacterial infection.
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Affiliation(s)
- Masaya Takehara
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan.
| | - Soshi Seike
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | - Teruhisa Takagishi
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | - Keiko Kobayashi
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan
| | - Masahiro Nagahama
- Department of Microbiology, Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Yamashiro-cho, Tokushima 770-8514, Japan.
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Potentiation and tolerance of toll-like receptor priming in human endothelial cells. Transl Res 2017; 180:53-67.e4. [PMID: 27567430 PMCID: PMC5253081 DOI: 10.1016/j.trsl.2016.08.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 07/29/2016] [Accepted: 08/01/2016] [Indexed: 11/21/2022]
Abstract
Repeated challenge of lipopolysaccharide (LPS) alters the response to subsequent LPS exposures via modulation of toll-like receptor 4 (TLR4). Whether activation of other TLRs can modulate TLR4 responses, and vice versa, remains unclear. Specifically with regards to endothelial cells, a key component of innate immunity, the impact of TLR cross-modulation is unknown. We postulated that TLR2 priming (via Pam3Csk4) would inhibit TLR4-mediated responses while TLR3 priming (via Poly I:C) would enhance subsequent TLR4-inflammatory signaling. We studied human umbilical vein endothelial cells (HUVECs) and neonatal human dermal microvascular endothelial cells (HMVECs). Cells were primed with a combination of Poly I:C (10 μg/ml), Pam3Csk4 (10 μg/ml), or LPS (100 ng/ml), then washed and allowed to rest. They were then rechallenged with either Poly I:C, Pam3Csk4 or LPS. Endothelial cells showed significant tolerance to repeated LPS challenge. Priming with Pam3Csk4 also reduced the response to secondary LPS challenge in both cell types, despite a reduced proinflammatory response to Pam3Csk4 in HMVECs compared to HUVECs. Poly I:C priming enhanced inflammatory and interferon producing signals upon Poly I:C or LPS rechallenge, respectively. Poly I:C priming induced interferon regulatory factor 7, leading to enhancement of interferon production. Finally, both Poly I:C and LPS priming induced significant changes in receptor-interacting serine/threonine-protein kinase 1 activity. Pharmacological inhibition of receptor-interacting serine/threonine-protein kinase 1 or interferon regulatory factor 7 reduced the potentiated phenotype of TLR3 priming on TLR4 rechallenge. These results demonstrate that in human endothelial cells, prior activation of TLRs can have a significant impact on subsequent exposures and may contribute to the severity of the host response.
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32
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Moreira V, Teixeira C, Borges da Silva H, D'Império Lima MR, Dos-Santos MC. The role of TLR2 in the acute inflammatory response induced by Bothrops atrox snake venom. Toxicon 2016; 118:121-8. [PMID: 27109323 DOI: 10.1016/j.toxicon.2016.04.042] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 04/16/2016] [Accepted: 04/20/2016] [Indexed: 01/04/2023]
Abstract
Envenomation by snakes of the species Bothrops atrox induces local and systemic effects. Local effects include drastic tissue damage and a marked inflammatory response as a result of the synthesis and release of a variety of protein and lipid mediators. Toll-like receptor (TLR) signaling pathways can play an important role in this response, leading to synthesis of these inflammatory mediators. This study investigated the influence of TLR2 on the acute inflammatory response induced by Bothrops atrox venom. Wild-type C57BL/6 mice (WT) and TLR2 gene knockout mice (TLR2(-/-)) were injected with Bothrops atrox venom (BaV), and the following responses to the venom were assessed in peritoneal exudate: leukocyte accumulation; release of mediators, including CCL-2, IL-10, IL-1β, IL-6 and LTB4; protein expression of COX-1 and COX-2; and quantification of their products PGE2 and TXA2. After injection with BaV, the TLR2(-/-) mice (TLR2(-/-)BaV) had higher levels of IL-6 and CCL-2 than WT animals kept under the same conditions (WTBaV), together with an accumulation of polymorphonuclear leukocytes (PMNs), inhibition of IL-1β and LTB4 and reduced mononuclear leukocyte influx. However, no significant differences in COX-2 protein expression or PGE2, TXA2 and IL-10 production between the TLR2(-/-)BaV and WTBav animals were observed. Together, these results indicate that the signaling pathway activated by TLR2 acts by modulating the induced inflammatory response to BaV through the direct action of venom-associated molecular patterns (VAMPs) or indirectly by forming damage-associated molecular patterns (DAMPs) and that this may have important therapeutic implications.
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Affiliation(s)
- Vanessa Moreira
- Pharmacology Laboratory, Butantan Institute, São Paulo, SP, Brazil
| | | | - Henrique Borges da Silva
- Immunology Department, Institute of Biomedical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | | | - Maria Cristina Dos-Santos
- Immunochemistry Laboratory, Parasitology Department, Institute of Biological Sciences, Federal University of Amazonas, Manaus, AM, Brazil.
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Abstract
Our understanding of sepsis and its resultant outcomes remains a paradox. On the one hand, we know more about the pathophysiology of sepsis than ever before. However, this knowledge has not been successfully translated to the bedside, as the vast majority of clinical trials for sepsis have been negative. Yet even in the general absence of positive clinical trials, mortality from sepsis has fallen to its lowest point in history, in large part due to educational campaigns that stress timely antibiotics and hemodynamic support. While additional improvements in outcome will assuredly result from further compliance with evidence based practices, a deeper understanding of the science that underlies the host response in sepsis is critical to the development of novel therapeutics. In this review, we outline immunopathologic abnormalities in sepsis, and then look at potential approaches to therapeutically modulate them. Ultimately, an understanding of the science underlying sepsis should allow the critical care community to utilize precision medicine to combat this devastating disease on an individual basis leading to improved outcomes.
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Affiliation(s)
- Kevin W McConnell
- Emory University School of Medicine, Emory Critical Care Center, Department of Surgery, Atlanta, GA, United States
| | - Craig M Coopersmith
- Emory University School of Medicine, Emory Critical Care Center, Department of Surgery, Atlanta, GA, United States.
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Salvador B, Arranz A, Francisco S, Córdoba L, Punzón C, Llamas MÁ, Fresno M. Modulation of endothelial function by Toll like receptors. Pharmacol Res 2016; 108:46-56. [PMID: 27073018 DOI: 10.1016/j.phrs.2016.03.038] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 03/30/2016] [Accepted: 03/30/2016] [Indexed: 12/23/2022]
Abstract
Endothelial cells (EC) are able to actively control vascular permeability, coagulation, blood pressure and angiogenesis. Most recently, a role for endothelial cells in the immune response has been described. Therefore, the endothelium has a dual role controlling homeostasis but also being the first line for host defence and tissue damage repair thanks to its ability to mount an inflammatory response. Endothelial cells have been shown to express pattern-recognition receptors (PRR) including Toll-like receptors (TLR) that are activated in response to stimuli within the bloodstream including pathogens and damage signals. TLRs are strategic mediators of the immune response in endothelial cells but they also regulate the angiogenic process critical for tissue repair. Nevertheless, endothelial activation and angiogenesis can contribute to some pathologies. Thus, inappropriate endothelial activation, also known as endothelial dysfunction, through TLRs contributes to tissue damage during autoimmune and inflammatory diseases such as atherosclerosis, hypertension, ischemia and diabetes associated cardiovascular diseases. Also TLR induced angiogenesis is required for the growth of some tumors, atherosclerosis and rheumatoid arthritis, among others. In this review we discuss the importance of various TLRs in modulating the activation of endothelial cells and their importance in immunity to infection and vascular disease as well as their potential as therapeutic targets.
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Affiliation(s)
| | - Alicia Arranz
- Centro de Biología Molecular "Severo Ochoa", Universidad Autónoma de Madrid, Madrid, Spain.
| | - Sara Francisco
- Diomune SL, Parque Científico de Madrid, Madrid, Spain; Centro de Biología Molecular "Severo Ochoa", Universidad Autónoma de Madrid, Madrid, Spain.
| | - Laura Córdoba
- Diomune SL, Parque Científico de Madrid, Madrid, Spain.
| | - Carmen Punzón
- Diomune SL, Parque Científico de Madrid, Madrid, Spain.
| | | | - Manuel Fresno
- Diomune SL, Parque Científico de Madrid, Madrid, Spain; Centro de Biología Molecular "Severo Ochoa", Universidad Autónoma de Madrid, Madrid, Spain.
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35
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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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Wilhelmsen K, Xu F, Farrar K, Tran A, Khakpour S, Sundar S, Prakash A, Wang J, Gray NS, Hellman J. Extracellular signal-regulated kinase 5 promotes acute cellular and systemic inflammation. Sci Signal 2015; 8:ra86. [PMID: 26307013 DOI: 10.1126/scisignal.aaa3206] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Inflammatory critical illness is a syndrome that is characterized by acute inflammation and organ injury, and it is triggered by infections and noninfectious tissue injury, both of which activate innate immune receptors and pathways. Although reports suggest an anti-inflammatory role for the mitogen-activated protein kinase (MAPK) extracellular signal-regulated kinase 5 (ERK5), we previously found that ERK5 mediates proinflammatory responses in primary human cells in response to stimulation of Toll-like receptor 2 (TLR2). We inhibited the kinase activities and reduced the abundances of ERK5 and MEK5, a MAPK kinase directly upstream of ERK5, in primary human vascular endothelial cells and monocytes, and found that ERK5 promoted inflammation induced by a broad range of microbial TLR agonists and by the proinflammatory cytokines interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α). Furthermore, we found that inhibitors of MEK5 or ERK5 reduced the plasma concentrations of proinflammatory cytokines in mice challenged with TLR ligands or heat-killed Staphylococcus aureus, as well as in mice that underwent sterile lung ischemia-reperfusion injury. Finally, we found that inhibition of ERK5 protected endotoxemic mice from death. Together, our studies support a proinflammatory role for ERK5 in primary human endothelial cells and monocytes, and suggest that ERK5 is a potential therapeutic target in diverse disorders that cause inflammatory critical illness.
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Affiliation(s)
- Kevin Wilhelmsen
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, CA 94143, USA.
| | - Fengyun Xu
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Katherine Farrar
- Graduate Program in Biomedical Sciences, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Alphonso Tran
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Samira Khakpour
- Graduate Program in Biomedical Sciences, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Shirin Sundar
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Arun Prakash
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Jinhua Wang
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Nathanael S Gray
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Dana-Farber Cancer Institute, Boston, MA 02215, USA
| | - Judith Hellman
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, San Francisco, CA 94143, USA. Division of Critical Care Medicine and Biomedical Sciences Program, University of California, San Francisco, San Francisco, CA 94143, USA
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Quillard T, Araújo HA, Franck G, Shvartz E, Sukhova G, Libby P. TLR2 and neutrophils potentiate endothelial stress, apoptosis and detachment: implications for superficial erosion. Eur Heart J 2015; 36:1394-404. [PMID: 25755115 DOI: 10.1093/eurheartj/ehv044] [Citation(s) in RCA: 252] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 02/01/2015] [Indexed: 12/12/2022] Open
Abstract
AIMS Superficial erosion of atheromata causes many acute coronary syndromes, but arises from unknown mechanisms. This study tested the hypothesis that Toll-like receptor-2 (TLR2) activation contributes to endothelial apoptosis and denudation and thus contributes to the pathogenesis of superficial erosion. METHODS AND RESULTS Toll-like receptor-2 and neutrophils localized at sites of superficially eroded human plaques. In vitro, TLR2 ligands (including hyaluronan, a matrix macromolecule abundant in eroded lesions) induced endothelial stress, characterized by reactive oxygen species production, endoplasmic reticulum (ER) stress, and apoptosis. Co-incubation of neutrophils with endothelial cells (ECs) potentiated these effects and induced EC apoptosis and detachment. We then categorized human atherosclerotic plaques (n = 56) based on morphologic features associated with superficial erosion, 'stable' fibrotic, or 'vulnerable' lesions. Morphometric analyses of the human atheromata localized neutrophils and neutrophil extracellular traps (NETs) near clusters of apoptotic ECs in smooth muscle cell (SMC)-rich plaques. The number of luminal apoptotic ECs correlated with neutrophil accumulation, amount of NETs, and TLR2 staining in SMC-rich plaques, but not in 'vulnerable' atheromata. CONCLUSION These in vitro observations and analyses of human plaques indicate that TLR2 stimulation followed by neutrophil participation may render smooth muscle cell-rich plaques susceptible to superficial erosion and thrombotic complications by inducing ER stress, apoptosis, and favouring detachment of EC.
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Affiliation(s)
- Thibaut Quillard
- Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA INSERM, UMR957, Université de Nantes, Nantes Atlantique Universités, EA3822, 1 Rue Gaston Veil, Nantes 44035, France
| | - Haniel Alves Araújo
- Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Gregory Franck
- Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Eugenia Shvartz
- Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Galina Sukhova
- Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
| | - Peter Libby
- Division of Cardiovascular Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA
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Watanabe T, Tanigawa T, Kobata A, Takeda S, Nadatani Y, Otani K, Yamagami H, Shiba M, Tominaga K, Fujiwara Y, Arakawa T. Toll-like receptor 2 mediates ischemia-reperfusion injury of the small intestine in adult mice. PLoS One 2014; 9:e110441. [PMID: 25329155 PMCID: PMC4199713 DOI: 10.1371/journal.pone.0110441] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2014] [Accepted: 09/18/2014] [Indexed: 02/06/2023] Open
Abstract
Toll-like receptor 2 (TLR2) recognizes conserved molecular patterns associated with both gram-negative and gram-positive bacteria, and detects some endogenous ligands. Previous studies demonstrated that in ischemia-reperfusion (I/R) injury of the small intestine, the TLR2-dependent signaling exerted preventive effects on the damage in young mice, but did not have a significant effect in neonatal mice. We investigated the role of TLR2 in adult ischemia-reperfusion injury in the small intestine. Wild-type and TLR2 knockout mice at 16 weeks of age were subjected to intestinal I/R injury. Some wild-type mice received anti-Ly-6G antibodies to deplete circulating neutrophils. In wild-type mice, I/R induced severe small intestinal injury characterized by infiltration by inflammatory cells, disruption of the mucosal epithelium, and mucosal bleeding. Compared to wild-type mice, TLR2 knockout mice exhibited less severe mucosal injury induced by I/R, with a 35%, 33%, and 43% reduction in histological grading score and luminal concentration of hemoglobin, and the numbers of apoptotic epithelial cells, respectively. The I/R increased the activity of myeloperoxidase (MPO), a marker of neutrophil infiltration, and the levels of mRNA expression of tumor necrosis factor-α (TNF-α), intercellular adhesion molecule-1 (ICAM-1), and cyclooxygenase-2 (COX-2) in the small intestine of the wild-type mice by 3.3-, 3.2-, and 13.0-fold, respectively. TLR2 deficiency significantly inhibited the I/R-induced increase in MPO activity and the expression of mRNAs for TNF-α and ICAM-1, but did not affect the expression of COX-2 mRNA. I/R also enhanced TLR2 mRNA expression by 2.9-fold. TLR2 proteins were found to be expressed in the epithelial cells, inflammatory cells, and endothelial cells. Neutrophil depletion prevented intestinal I/R injury in wild-type mice. These findings suggest that TLR2 may mediate I/R injury of the small intestine in adult mice via induction of inflammatory mediators such as TNF-α and ICAM-1.
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Affiliation(s)
- Toshio Watanabe
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan
- * E-mail:
| | - Tetsuya Tanigawa
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Atsushi Kobata
- Department of Pharmacology and Experimental Therapeutics, Kyoto Pharmaceutical University, Kyoto, Japan
| | - Shogo Takeda
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Yuji Nadatani
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Koji Otani
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Hirokazu Yamagami
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Masatsugu Shiba
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Kazunari Tominaga
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Yasuhiro Fujiwara
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan
| | - Tetsuo Arakawa
- Department of Gastroenterology, Osaka City University Graduate School of Medicine, Osaka, Japan
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Vielma SA, Klein RL, Levingston CA, Young MRI. Skewing of immune cell cytokine production by mediators from adipocytes and endothelial cells. Adipocyte 2014; 3:126-31. [PMID: 24719786 PMCID: PMC3979877 DOI: 10.4161/adip.28287] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Revised: 02/18/2014] [Accepted: 02/19/2014] [Indexed: 01/14/2023] Open
Abstract
Since adipose tissue is composed of adipocytes as well as other cell types including endothelial cells, this study sought to determine how mediators from adipocytes and from endothelial cells impact on immune cell production of cytokines. A minimalistic design was used in which media conditioned by adipocytes or by endothelial cells were added individually or as a mixture to normal spleen cells. Media from adipocytes or endothelial cells each stimulated spleen cell production of Th1 cytokines, Th2 cytokines, most of the measured inflammatory cytokines, and some chemokines. However, a mixture of media conditioned by adipocytes and by endothelial cells inhibited production of Th1 cytokines and skewed reactivity toward a Th2 and inflammatory phenotype. Adiponectin, but not leptin, was shown to contribute to the skewing of immune responsiveness to endothelial cell-derived mediators.
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Wilhelmsen K, Khakpour S, Tran A, Sheehan K, Schumacher M, Xu F, Hellman J. The endocannabinoid/endovanilloid N-arachidonoyl dopamine (NADA) and synthetic cannabinoid WIN55,212-2 abate the inflammatory activation of human endothelial cells. J Biol Chem 2014; 289:13079-100. [PMID: 24644287 DOI: 10.1074/jbc.m113.536953] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Although cannabinoids, such as Δ(9)-tetrahydrocannabinol, have been studied extensively for their psychoactive effects, it has become apparent that certain cannabinoids possess immunomodulatory activity. Endothelial cells (ECs) are centrally involved in the pathogenesis of organ injury in acute inflammatory disorders, such as sepsis, because they express cytokines and chemokines, which facilitate the trafficking of leukocytes to organs, and they modulate vascular barrier function. In this study, we find that primary human ECs from multiple organs express the cannabinoid receptors CB1R, GPR18, and GPR55, as well as the ion channel transient receptor potential cation channel vanilloid type 1. In contrast to leukocytes, CB2R is only minimally expressed in some EC populations. Furthermore, we show that ECs express all of the known endocannabinoid (eCB) metabolic enzymes. Examining a panel of cannabinoids, we demonstrate that the synthetic cannabinoid WIN55,212-2 and the eCB N-arachidonoyl dopamine (NADA), but neither anandamide nor 2-arachidonoylglycerol, reduce EC inflammatory responses induced by bacterial lipopeptide, LPS, and TNFα. We find that endothelial CB1R/CB2R are necessary for the effects of NADA, but not those of WIN55,212-2. Furthermore, transient receptor potential cation channel vanilloid type 1 appears to counter the anti-inflammatory properties of WIN55,212-2 and NADA, but conversely, in the absence of these cannabinoids, its inhibition exacerbates the inflammatory response in ECs activated with LPS. These data indicate that the eCB system can modulate inflammatory activation of the endothelium and may have important implications for a variety of acute inflammatory disorders that are characterized by EC activation.
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Williams AE, Chambers RC. The mercurial nature of neutrophils: still an enigma in ARDS? Am J Physiol Lung Cell Mol Physiol 2013; 306:L217-30. [PMID: 24318116 DOI: 10.1152/ajplung.00311.2013] [Citation(s) in RCA: 287] [Impact Index Per Article: 26.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The acute respiratory distress syndrome (ARDS) is a life-threatening lung condition resulting from direct and indirect insults to the lung. It is characterized by disruption of the endothelial-epithelial barrier, alveolar damage, pulmonary edema, and respiratory failure. A key feature of ARDS is the accumulation of neutrophils in the lung microvasculature, interstitium, and alveolar space. Despite a clear association between neutrophil influx into the lung and disease severity, there is some debate as to whether neutrophils directly contribute to disease pathogenesis. The primary function of neutrophils is to provide immediate host defense against pathogenic microorganisms. Neutrophils release numerous antimicrobial factors such as reactive oxygen species, proteinases, and neutrophil extracellular traps. However, these factors are also toxic to host cells and can result in bystander tissue damage. The excessive accumulation of neutrophils in ARDS may therefore contribute to disease progression. Central to neutrophil recruitment is the release of chemokines, including the archetypal neutrophil chemoattractant IL-8, from resident pulmonary cells. However, the chemokine network in the inflamed lung is complex and may involve several other chemokines, including CXCL10, CCL2, and CCL7. This review will therefore focus on the experimental and clinical evidence supporting neutrophils as key players in ARDS and the chemokines involved in recruiting them into the lung.
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Affiliation(s)
- Andrew E Williams
- Centre for Inflammation and Tissue Repair, Univ. College London, Rayne Institute, 5 Univ. St., London WC1E 6JF, UK.
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Wilhelmsen K, Farrar K, Hellman J. Quantitative in vitro assay to measure neutrophil adhesion to activated primary human microvascular endothelial cells under static conditions. J Vis Exp 2013:e50677. [PMID: 23995778 DOI: 10.3791/50677] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
The vascular endothelium plays an integral part in the inflammatory response. During the acute phase of inflammation, endothelial cells (ECs) are activated by host mediators or directly by conserved microbial components or host-derived danger molecules. Activated ECs express cytokines, chemokines and adhesion molecules that mobilize, activate and retain leukocytes at the site of infection or injury. Neutrophils are the first leukocytes to arrive, and adhere to the endothelium through a variety of adhesion molecules present on the surfaces of both cells. The main functions of neutrophils are to directly eliminate microbial threats, promote the recruitment of other leukocytes through the release of additional factors, and initiate wound repair. Therefore, their recruitment and attachment to the endothelium is a critical step in the initiation of the inflammatory response. In this report, we describe an in vitro neutrophil adhesion assay using calcein AM-labeled primary human neutrophils to quantitate the extent of microvascular endothelial cell activation under static conditions. This method has the additional advantage that the same samples quantitated by fluorescence spectrophotometry can also be visualized directly using fluorescence microscopy for a more qualitative assessment of neutrophil binding.
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Affiliation(s)
- Kevin Wilhelmsen
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, CA, USA.
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Lakota K, Mrak-Poljsak K, Bozic B, Tomsic M, Sodin-Semrl S. Serum amyloid A activation of human coronary artery endothelial cells exhibits a neutrophil promoting molecular profile. Microvasc Res 2013; 90:55-63. [PMID: 23938271 DOI: 10.1016/j.mvr.2013.07.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 07/25/2013] [Accepted: 07/29/2013] [Indexed: 10/26/2022]
Abstract
BACKGROUND Serum amyloid A (SAA) has been shown to be an active participant in atherosclerosis and cardiovascular diseases. SAA-stimulated human coronary artery endothelial cells (HCAEC) were reported to release pro-inflammatory cytokines, chemokines and adhesion molecules; however it remains unclear which putative SAA receptors are present in these cells and how they act. We investigated the effects of inflammatory stimuli on the expression of SAA receptors, signaling pathways and molecular profiles in HCAEC. METHODOLOGY/PRINCIPLE FINDINGS HCAEC were cultured in vitro and stimulated with SAA (1000nM) or IL-1β (1000pg/ml). Expression of mRNA was determined by qPCR, and expression and quantification of proteins were assessed by dot array blots and ELISA, respectively. Protein phosphorylation was determined by dot blot arrays and Western blots. We report that all potential SAA receptors tested (FPR2/ALX, RAGE, TANIS, TLR2, TLR4 and CLA-1/hSR-B1) are expressed in HCAEC. Importantly, IL-1β or SAA significantly increased solely the expression of the innate immune receptor TLR2. SAA upregulated the phosphorylation of ERK1/2, NF-κB (p65, p105) and JNK, as well as expression/release of IL-6, IL-8, G-CSF, GM-CSF, ICAM-1 and VCAM-1, all potent molecules involved in neutrophil-related activities. A TLR2-dependent positive feedback mechanism of SAA expression was found. CONCLUSION/SIGNIFICANCE SAA stimulated responses in HCAEC target neutrophil rather than monocyte/macrophage activation.
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Affiliation(s)
- Katja Lakota
- University Medical Centre, Department of Rheumatology, Ljubljana, Slovenia
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Alveolar macrophages and Toll-like receptor 4 mediate ventilated lung ischemia reperfusion injury in mice. Anesthesiology 2012; 117:822-35. [PMID: 22890118 DOI: 10.1097/aln.0b013e31826a4ae3] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND Ischemia-reperfusion (I-R) injury is a sterile inflammatory process that is commonly associated with diverse clinical situations such as hemorrhage followed by resuscitation, transient embolic events, and organ transplantation. I-R injury can induce lung dysfunction whether the I-R occurs in the lung or in a remote organ. Recently, evidence has emerged that receptors and pathways of the innate immune system are involved in recognizing sterile inflammation and overlap considerably with those involved in the recognition of and response to pathogens. METHODS The authors used a mouse surgical model of transient unilateral left pulmonary artery occlusion without bronchial involvement to create ventilated lung I-R injury. In addition, they mimicked nutritional I-R injury in vitro by transiently depriving cells of all nutrients. RESULTS Compared with sham-operated mice, mice subjected to ventilated lung I-R injury had up-regulated lung expression of inflammatory mediator messenger RNA for interleukin-1β, interleukin-6, and chemokine (C-X-C motif) ligand-1 and -2, paralleled by histologic evidence of lung neutrophil recruitment and increased plasma concentrations of interleukin-1β, interleukin-6, and high-mobility group protein B1 proteins. This inflammatory response to I-R required toll-like receptor-4 (TLR4). In addition, the authors demonstrated in vitro cooperativity and cross-talk between human macrophages and endothelial cells, resulting in augmented inflammatory responses to I-R. Remarkably, the authors found that selective depletion of alveolar macrophages rendered mice resistant to ventilated lung I-R injury. CONCLUSIONS The data reveal that alveolar macrophages and the pattern recognition receptor toll-like receptor-4 are involved in the generation of the early inflammatory response to lung I-R injury.
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Young MR. Endothelial cells in the eyes of an immunologist. Cancer Immunol Immunother 2012; 61:1609-16. [PMID: 22903347 DOI: 10.1007/s00262-012-1335-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Accepted: 07/31/2012] [Indexed: 12/11/2022]
Abstract
Endothelial cell activation in the process of tumor angiogenesis and in various aspects of vascular biology has been extensively studied. However, endothelial cells also function in other capacities, including in immune regulation. Compared to the more traditional immune regulatory populations (Th1, Th2, Treg, etc.), endothelial cells have received far less credit as being immune regulators. Their regulatory capacity is multifaceted. They are critical in both limiting and facilitating the trafficking of various immune cell populations, including T cells and dendritic cells, out of the vasculature and into tissue. They also can be induced to stimulate immune reactivity or to be immune inhibitory. In each of these parameters (trafficking, immune stimulation and immune inhibition), their role can be physiological, whereby they have an active role in maintaining health. Alternatively, their role can be pathological, whereby they contribute to disease. In theory, endothelial cells are in an ideal location to recruit cells that can mediate immune reactivity to tumor tissue. Furthermore, they can activate the immune cells as they transmigrate across the endothelium into the tumor. However, what is seen is the absence of these protective effects of endothelial cells and, instead, the endothelial cells succumb to the defense mechanisms of the tumor, resulting in their acquisition of a tumor-protective role. To understand the immune regulatory potential of endothelial cells in protecting the host versus the tumor, it is useful to better understand the other circumstances in which endothelial cells modulate immune reactivities. Which of the multitude of immune regulatory roles that endothelial cells can take on seems to rely on the type of stimulus that they are encountering. It also depends on the extent to which they can be manipulated by potential dangers to succumb and contribute toward attack on the host. This review will explore the physiological and pathological roles of endothelial cells as they regulate immune trafficking, immune stimulation and immune inhibition in a variety of conditions and will then apply this information to their role in the tumor environment. Strategies to harness the immune regulatory potential of endothelial cells are starting to emerge in the non-tumor setting. Results from such efforts are expected to be applicable to being able to skew endothelial cells from having a tumor-protective role to a host-protective role.
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Affiliation(s)
- M Rita Young
- Research Services, Ralph H. Johnson Veterans Affairs Medical Center, Charleston, SC 29401, USA.
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Wilhelmsen K, Mesa KR, Lucero J, Xu F, Hellman J. ERK5 protein promotes, whereas MEK1 protein differentially regulates, the Toll-like receptor 2 protein-dependent activation of human endothelial cells and monocytes. J Biol Chem 2012; 287:26478-94. [PMID: 22707717 DOI: 10.1074/jbc.m112.359489] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Endothelial cell (EC) Toll-like receptor 2 (TLR2) activation up-regulates the expression of inflammatory mediators and of TLR2 itself and modulates important endothelial functions, including coagulation and permeability. We defined TLR2 signaling pathways in EC and tested the hypothesis that TLR2 signaling differs in EC and monocytes. We found that ERK5, heretofore unrecognized as mediating TLR2 activation in any cell type, is a central mediator of TLR2-dependent inflammatory signaling in human umbilical vein endothelial cells, primary human lung microvascular EC, and human monocytes. Additionally, we observed that, although MEK1 negatively regulates TLR2 signaling in EC, MEK1 promotes TLR2 signaling in monocytes. We also noted that activation of TLR2 led to the up-regulation of intracellularly expressed TLR2 and inflammatory mediators via NF-κB, JNK, and p38-MAPK. Finally, we found that p38-MAPK, JNK, ERK5, and NF-κB promote the attachment of human neutrophils to lung microvascular EC that were pretreated with TLR2 agonists. This study newly identifies ERK5 as a key regulator of TLR2 signaling in EC and monocytes and indicates that there are fundamental differences in TLR signaling pathways between EC and monocytes.
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Affiliation(s)
- Kevin Wilhelmsen
- Department of Anesthesia and Perioperative Care, University of California, San Francisco, California 94143,USA.
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