1
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Mun SJ, Cho E, Kim HK, Gil WJ, Yang CS. Enhancing acute inflammatory and sepsis treatment: superiority of membrane receptor blockade. Front Immunol 2024; 15:1424768. [PMID: 39081318 PMCID: PMC11286478 DOI: 10.3389/fimmu.2024.1424768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2024] [Accepted: 07/03/2024] [Indexed: 08/02/2024] Open
Abstract
Conditions such as acute pancreatitis, ulcerative colitis, delayed graft function and infections caused by a variety of microorganisms, including gram-positive and gram-negative organisms, increase the risk of sepsis and therefore mortality. Immune dysfunction is a characterization of sepsis, so timely and effective treatment strategies are needed. The conventional approaches, such as antibiotic-based treatments, face challenges such as antibiotic resistance, and cytokine-based treatments have shown limited efficacy. To address these limitations, a novel approach focusing on membrane receptors, the initiators of the inflammatory cascade, is proposed. Membrane receptors such as Toll-like receptors, interleukin-1 receptor, endothelial protein C receptor, μ-opioid receptor, triggering receptor expressed on myeloid cells 1, and G-protein coupled receptors play pivotal roles in the inflammatory response, offering opportunities for rapid regulation. Various membrane receptor blockade strategies have demonstrated efficacy in both preclinical and clinical studies. These membrane receptor blockades act as early stage inflammation modulators, providing faster responses compared to conventional therapies. Importantly, these blockers exhibit immunomodulatory capabilities without inducing complete immunosuppression. Finally, this review underscores the critical need for early intervention in acute inflammatory and infectious diseases, particularly those posing a risk of progressing to sepsis. And, exploring membrane receptor blockade as an adjunctive treatment for acute inflammatory and infectious diseases presents a promising avenue. These novel approaches, when combined with antibiotics, have the potential to enhance patient outcomes, particularly in conditions prone to sepsis, while minimizing risks associated with antibiotic resistance and immune suppression.
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Affiliation(s)
- Seok-Jun Mun
- Department of Bionano Engineering, Hanyang University, Seoul, Republic of Korea
- Center for Bionano Intelligence Education and Research, Hanyang University, Ansan, Republic of Korea
| | - Euni Cho
- Department of Bionano Engineering, Hanyang University, Seoul, Republic of Korea
- Center for Bionano Intelligence Education and Research, Hanyang University, Ansan, Republic of Korea
| | - Hyo Keun Kim
- Center for Bionano Intelligence Education and Research, Hanyang University, Ansan, Republic of Korea
- Department of Molecular and Life Science, Hanyang University, Ansan, Republic of Korea
| | - Woo Jin Gil
- Center for Bionano Intelligence Education and Research, Hanyang University, Ansan, Republic of Korea
- Department of Molecular and Life Science, Hanyang University, Ansan, Republic of Korea
| | - Chul-Su Yang
- Center for Bionano Intelligence Education and Research, Hanyang University, Ansan, Republic of Korea
- Department of Molecular and Life Science, Hanyang University, Ansan, Republic of Korea
- Department of Medicinal and Life Science, Hanyang University, Ansan, Republic of Korea
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2
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Ahmed Fahmy ME, Abdel-Aal AA, Shalaby MA, Issa R, Badawi M, Fouly MA. Modulation of CXCL10 activity as a therapeutic target of ocular toxoplasmosis in diabetic mice. J Parasit Dis 2024; 48:33-45. [PMID: 38440758 PMCID: PMC10908887 DOI: 10.1007/s12639-023-01635-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Accepted: 11/09/2023] [Indexed: 03/06/2024] Open
Abstract
Ocular toxoplasmosis is likely the most common cause of infectious posterior uveitis worldwide. CXCL10 chemokine has an important role in the maintenance of the T-cell response and the control of Toxoplasma gondii in the eye during chronic infection. Drugs that can modulate the chemokine activity could be effective against the parasite. In this work, CXCL10 local retinal expression was investigated in a diabetic mouse model with ocular toxoplasmosis for the first time. In addition, the efficacy of naphthoquinones and quinolones was compared to spiramycin (SP) in treating the infection and modulating the chemokine expression. Our results revealed that chloroquine (CQ) achieved the best results regarding the reduction of cerebral cyst burden (84.36%), improving the retinal histopathological changes, cellular infiltrates, and vasculitis significantly (P < 0.005), and balancing the strong CXCL10 expression caused by the infection. Buparvaquone-treated mice showed a significant percentage of reduction of brain cysts (76.25%), moderate improvement of histopathology, and mild to moderate CXCL10 expression. While SP showed the least efficacy against the parasite in the eye in the form of mild improvement of histopathological changes and downregulation of retinal chemokine expression with the least reduction rate of cerebral parasitic burden (57%). In conclusion, Optimal control of pathogens probably needs a balanced immune response with an optimum expression of chemokines. So, targeting the modulation of retinal CXCL10 may eventually be beneficial in the management of ocular toxoplasmosis plus its potential to act as a marker for predictive local immunological response during the infection.
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Affiliation(s)
| | - Amany Ahmed Abdel-Aal
- Department of Medical Parasitology, Faculty of Medicine, Cairo University, Cairo, Egypt
- Department of Postgraduate Studies & Scientific Research, Armed Forces College of Medicine (AFCM), Cairo, Egypt
| | - Maisa Ahmed Shalaby
- Department of Medical Parasitology, Theodor Bilharz Research Institute (TBRI), Giza, Egypt
| | - Ragaa Issa
- Departement of Parasitology, Research Institute of Ophthalmology, Giza, Egypt
| | - Manal Badawi
- Departement of Pathology, National Research Center, Giza, Egypt
| | - Marwa A. Fouly
- Departement of Retina, Research Institute of Ophthalmology, Giza, Egypt
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3
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Villacampa A, Alfaro E, Morales C, Díaz-García E, López-Fernández C, Bartha JL, López-Sánchez F, Lorenzo Ó, Moncada S, Sánchez-Ferrer CF, García-Río F, Cubillos-Zapata C, Peiró C. SARS-CoV-2 S protein activates NLRP3 inflammasome and deregulates coagulation factors in endothelial and immune cells. Cell Commun Signal 2024; 22:38. [PMID: 38225643 PMCID: PMC10788971 DOI: 10.1186/s12964-023-01397-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Accepted: 11/12/2023] [Indexed: 01/17/2024] Open
Abstract
BACKGROUND Hyperinflammation, hypercoagulation and endothelial injury are major findings in acute and post-COVID-19. The SARS-CoV-2 S protein has been detected as an isolated element in human tissues reservoirs and is the main product of mRNA COVID-19 vaccines. We investigated whether the S protein alone triggers pro-inflammatory and pro-coagulant responses in primary cultures of two cell types deeply affected by SARS-CoV-2, such are monocytes and endothelial cells. METHODS In human umbilical vein endothelial cells (HUVEC) and monocytes, the components of NF-κB and the NLRP3 inflammasome system, as well as coagulation regulators, were assessed by qRT-PCR, Western blot, flow cytometry, or indirect immunofluorescence. RESULTS S protein activated NF-κB, promoted pro-inflammatory cytokines release, and triggered the priming and activation of the NLRP3 inflammasome system resulting in mature IL-1β formation in both cell types. This was paralleled by enhanced production of coagulation factors such as von Willebrand factor (vWF), factor VIII or tissue factor, that was mediated, at least in part, by IL-1β. Additionally, S protein failed to enhance ADAMTS-13 levels to counteract the pro-coagulant activity of vWF multimers. Monocytes and HUVEC barely expressed angiotensin-converting enzyme-2. Pharmacological approaches and gene silencing showed that TLR4 receptors mediated the effects of S protein in monocytes, but not in HUVEC. CONCLUSION S protein behaves both as a pro-inflammatory and pro-coagulant stimulus in human monocytes and endothelial cells. Interfering with the receptors or signaling pathways evoked by the S protein may help preventing immune and vascular complications driven by such an isolated viral element. Video Abstract.
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Affiliation(s)
- Alicia Villacampa
- Department of Pharmacology, School of Medicine, Universidad Autónoma de Madrid, Madrid, Spain
| | - Enrique Alfaro
- Respiratory Diseases Group, Respiratory Service, La Paz University Hospital, IdiPAZ, Madrid, Spain
- Biomedical Research Networking Center on Respiratory Diseases (CIBERES), Madrid, Spain
| | - Cristina Morales
- Department of Pharmacology, School of Medicine, Universidad Autónoma de Madrid, Madrid, Spain
| | - Elena Díaz-García
- Respiratory Diseases Group, Respiratory Service, La Paz University Hospital, IdiPAZ, Madrid, Spain
- Biomedical Research Networking Center on Respiratory Diseases (CIBERES), Madrid, Spain
| | - Cristina López-Fernández
- Respiratory Diseases Group, Respiratory Service, La Paz University Hospital, IdiPAZ, Madrid, Spain
| | - José Luis Bartha
- Department of Obstetrics and Gynecology, School of Medicine, Universidad Autónoma de Madrid, Madrid, Spain
- Gynecology and Obstetrics Service, La Paz University Hospital, Madrid, Spain
| | | | - Óscar Lorenzo
- Laboratory of Diabetes and Vascular pathology, IIS-Fundación Jiménez Díaz, Madrid, Spain
- Biomedical Research Networking Centre on Diabetes and Associated Metabolic Disorders (CIBERDEM), Madrid, Spain
- Department of Medicine, School of Medicine, Universidad Autónoma de Madrid, Madrid, Spain
| | - Salvador Moncada
- Department of Pharmacology, School of Medicine, Universidad Autónoma de Madrid, Madrid, Spain
| | - Carlos F Sánchez-Ferrer
- Department of Pharmacology, School of Medicine, Universidad Autónoma de Madrid, Madrid, Spain
- Vascular Pharmacology and Metabolism (FARMAVASM) group, IdiPAZ, Madrid, Spain
| | - Francisco García-Río
- Respiratory Diseases Group, Respiratory Service, La Paz University Hospital, IdiPAZ, Madrid, Spain
- Biomedical Research Networking Center on Respiratory Diseases (CIBERES), Madrid, Spain
- Department of Medicine, School of Medicine, Universidad Autónoma de Madrid, Madrid, Spain
| | - Carolina Cubillos-Zapata
- Respiratory Diseases Group, Respiratory Service, La Paz University Hospital, IdiPAZ, Madrid, Spain.
- Biomedical Research Networking Center on Respiratory Diseases (CIBERES), Madrid, Spain.
| | - Concepción Peiró
- Department of Pharmacology, School of Medicine, Universidad Autónoma de Madrid, Madrid, Spain.
- Vascular Pharmacology and Metabolism (FARMAVASM) group, IdiPAZ, Madrid, Spain.
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4
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Cicchinelli S, Pignataro G, Gemma S, Piccioni A, Picozzi D, Ojetti V, Franceschi F, Candelli M. PAMPs and DAMPs in Sepsis: A Review of Their Molecular Features and Potential Clinical Implications. Int J Mol Sci 2024; 25:962. [PMID: 38256033 PMCID: PMC10815927 DOI: 10.3390/ijms25020962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 12/31/2023] [Accepted: 01/08/2024] [Indexed: 01/24/2024] Open
Abstract
Sepsis is a serious organ dysfunction caused by a dysregulated immune host reaction to a pathogen. The innate immunity is programmed to react immediately to conserved molecules, released by the pathogens (PAMPs), and the host (DAMPs). We aimed to review the molecular mechanisms of the early phases of sepsis, focusing on PAMPs, DAMPs, and their related pathways, to identify potential biomarkers. We included studies published in English and searched on PubMed® and Cochrane®. After a detailed discussion on the actual knowledge of PAMPs/DAMPs, we analyzed their role in the different organs affected by sepsis, trying to elucidate the molecular basis of some of the most-used prognostic scores for sepsis. Furthermore, we described a chronological trend for the release of PAMPs/DAMPs that may be useful to identify different subsets of septic patients, who may benefit from targeted therapies. These findings are preliminary since these pathways seem to be strongly influenced by the peculiar characteristics of different pathogens and host features. Due to these reasons, while initial findings are promising, additional studies are necessary to clarify the potential involvement of these molecular patterns in the natural evolution of sepsis and to facilitate their transition into the clinical setting.
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Affiliation(s)
- Sara Cicchinelli
- Department of Emergency, S.S. Filippo e Nicola Hospital, 67051 Avezzano, Italy;
| | - Giulia Pignataro
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
| | - Stefania Gemma
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
| | - Andrea Piccioni
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
| | - Domitilla Picozzi
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
| | - Veronica Ojetti
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
| | - Francesco Franceschi
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
| | - Marcello Candelli
- Department of Emergency, Anesthesiological and Reanimation Sciences, Fondazione Policlinico Universitario Agostino Gemelli—IRRCS, Università Cattolica del Sacro Cuore, 00168 Roma, Italy; (G.P.); (S.G.); (A.P.); (D.P.); (V.O.); (F.F.)
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5
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Contreras-Méndez LA, Medrano JF, Thomas MG, Enns RM, Speidel SE, Luna-Nevárez G, López-Castro PA, Rivera-Acuña F, Luna-Nevárez P. The Anti-Müllerian Hormone as Endocrine and Molecular Marker Associated with Reproductive Performance in Holstein Dairy Cows Exposed to Heat Stress. Animals (Basel) 2024; 14:213. [PMID: 38254382 PMCID: PMC10812537 DOI: 10.3390/ani14020213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 12/30/2023] [Accepted: 01/05/2024] [Indexed: 01/24/2024] Open
Abstract
Anti-Müllerian hormone (AMH) is proposed as a biomarker for fertility in cattle, yet this associative relationship appears to be influenced by heat stress (HS). The objective was to test serum AMH and AMH-related single nucleotide polymorphisms (SNPs) as markers potentially predictive of reproductive traits in dairy cows experiencing HS. The study included 300 Holstein cows that were genotyped using BovineSNP50 (54,000 SNP). A genome-wide association study was then executed. Nine intragenic SNPs within the pathways that influence the AMH gene were found important with multiple comparisons adjustment tests (p < 1.09 × 10-6). A further validation study was performed in an independent Holstein cattle population, which was divided into moderate (MH; n = 152) and severe heat-stressed (SH; n = 128) groups and then subjected to a summer reproductive management program. Serum AMH was confirmed as a predictor of fertility measures (p < 0.05) in MH but not in the SH group. Cows were genotyped, which revealed four SNPs as predictive markers for serum AMH (p < 0.01), reproductive traits (p < 0.01), and additional physiological variables (p < 0.05). These SNPs were in the genes AMH, IGFBP1, LGR5, and TLR4. In conclusion, serum AMH concentrations and AMH polymorphisms are proposed as predictive markers that can be used in conjunction with genomic breeding value approaches to improve reproductive performance in Holstein cows exposed to summer HS conditions.
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Affiliation(s)
- Luis A. Contreras-Méndez
- Departamento de Ciencias Agronómicas y Veterinarias, Instituto Tecnológico de Sonora, Ciudad Obregón 85000, Mexico
| | - Juan F. Medrano
- Department of Animal Science, University of California, Davis, CA 95616, USA
| | | | - R. Mark Enns
- Department of Animal Sciences, Colorado State University, Fort Collins, CO 80523, USA
| | - Scott E. Speidel
- Department of Animal Sciences, Colorado State University, Fort Collins, CO 80523, USA
| | - Guillermo Luna-Nevárez
- Departamento de Ciencias Agronómicas y Veterinarias, Instituto Tecnológico de Sonora, Ciudad Obregón 85000, Mexico
| | - Pedro A. López-Castro
- Departamento de Ciencias Agronómicas y Veterinarias, Instituto Tecnológico de Sonora, Ciudad Obregón 85000, Mexico
| | - Fernando Rivera-Acuña
- Departamento de Ciencias Agronómicas y Veterinarias, Instituto Tecnológico de Sonora, Ciudad Obregón 85000, Mexico
| | - Pablo Luna-Nevárez
- Departamento de Ciencias Agronómicas y Veterinarias, Instituto Tecnológico de Sonora, Ciudad Obregón 85000, Mexico
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6
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Yue L, Liu X, Wu C, Lai J, Wang J, Zhong H, Chen F. Toll-like receptor 4 promotes the inflammatory response in septic acute kidney injury by promoting p38 mitogen-activated protein kinase phosphorylation. J Bioenerg Biomembr 2023; 55:353-363. [PMID: 37605037 PMCID: PMC10556113 DOI: 10.1007/s10863-023-09972-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Accepted: 06/16/2023] [Indexed: 08/23/2023]
Abstract
Septic acute kidney injury (AKI) contributes to the mortality and morbidity of sepsis patients. Toll-like Receptor 4 (TLR4) has prominent roles in septic AKI. This study investigated the functions of TLR4 in septic AKI. A septic AKI mouse model was established by cecal ligation and puncture surgery. Mouse kidney function and kidney tissue lesion were examined using corresponding kits and H&E staining. The in vitro cell model of septic AKI was established by lipopolysaccharide induction. Cell viability, inflammatory factor (TNF-α, IL-6, IL-4, IL-1β, IL-18) levels, pyroptotic cell number changes, lactate dehydrogenase (LDH) activity, myeloperoxidase (MOP) concentration, and levels of pyroptosis-associated protein and MyD88, TRIF and p38 MAPK phosphorylation were determined by MTT, ELISA, FAM-FLICA Caspase-1 Detection kit, other corresponding kits, and Western blot. TLR4 was highly expressed in septic AKI mouse kidney tissues and human septic AKI cells. TLR4 knockdown alleviated kidney injury, increased cell viability, and reduced LDH activity and MPO concentration. TLR4 knockdown reduced cell pyroptosis by repressing p38 MAPK phosphorylation through MyD88/TRIF, suppressed pro-inflammatory factor (TNF-α, IL-6, IL-4, IL-1β, IL-18) levels, promoted anti-inflammatory factor (IL-4) level, and reduced inflammatory response, thus playing a protective role in septic AKI. Briefly, TLR4 promoted the inflammatory response in septic AKI by promoting p38 MAPK phosphorylation through MyD88/TRIF.
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Affiliation(s)
- Linlin Yue
- Department of Intensive care unit, The First Affiliated Hospital of Gannan Medical University, 128 Jinling Avenue, Zhanggong District, Ganzhou, Jiangxi Province, 341000, China
| | - Xin Liu
- Department of Intensive care unit, The First Affiliated Hospital of Gannan Medical University, 128 Jinling Avenue, Zhanggong District, Ganzhou, Jiangxi Province, 341000, China
| | - Chaoyu Wu
- Department of Intensive care unit, The First Affiliated Hospital of Gannan Medical University, 128 Jinling Avenue, Zhanggong District, Ganzhou, Jiangxi Province, 341000, China
| | - Jiying Lai
- Department of Intensive care unit, The First Affiliated Hospital of Gannan Medical University, 128 Jinling Avenue, Zhanggong District, Ganzhou, Jiangxi Province, 341000, China
| | - Jie Wang
- Department of Intensive care unit, The First Affiliated Hospital of Gannan Medical University, 128 Jinling Avenue, Zhanggong District, Ganzhou, Jiangxi Province, 341000, China
| | - Huifeng Zhong
- Department of Intensive care unit, The First Affiliated Hospital of Gannan Medical University, 128 Jinling Avenue, Zhanggong District, Ganzhou, Jiangxi Province, 341000, China
| | - Feng Chen
- Department of Pediatric Surgery, The First Affiliated Hospital of Gannan Medical University, 128 Jinling Avenue, Zhanggong District, Ganzhou, Jiangxi Province, 341000, China.
- Jiangxi Provincial Clinical Research Center for Vascular Anomalies, The First Affiliated Hospital of GanNan Medical University, Ganzhou, Jiangxi Province, 341000, China.
- Key Laboratory of Prevention and Treatment of Cardiovascular and Cerebrovascular Diseases, Ministry of Education, Gannan Medical University, Ganzhou, Jiangxi Province, 341000, China.
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7
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Cheng J, Zeng H, Chen H, Fan L, Xu C, Huang H, Tang T, Li M. Current knowledge of thrombocytopenia in sepsis and COVID-19. Front Immunol 2023; 14:1213510. [PMID: 37841241 PMCID: PMC10568455 DOI: 10.3389/fimmu.2023.1213510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 09/12/2023] [Indexed: 10/17/2023] Open
Abstract
Thrombocytopenia, characterized by a decrease in platelet count, is commonly observed in sepsis and COVID-19. In sepsis, thrombocytopenia can result from various mechanisms, including impaired platelet production in the bone marrow, accelerated platelet destruction due to increased inflammation, sequestration of platelets in the spleen, immune-mediated platelet destruction, or dysregulated host responses. Similarly, thrombocytopenia has been reported in COVID-19 patients, but the immune-related mechanisms underlying this association remain unclear. Notably, interventions targeting thrombocytopenia have shown potential for improving outcomes in both sepsis and COVID-19 patients. Understanding these mechanisms is crucial for developing effective treatments.
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Affiliation(s)
- Junjie Cheng
- Intensive Care Unit, The Fourth Affiliated Hospital, School of Medicine, Zhejiang University, Yiwu, China
| | - Hanhai Zeng
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Huaijun Chen
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Linfeng Fan
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Chaoran Xu
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Huaping Huang
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Tianchi Tang
- Department of Neurosurgery, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, China
| | - Min Li
- Intensive Care Unit, The Fourth Affiliated Hospital, School of Medicine, Zhejiang University, Yiwu, China
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8
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Cohen H, Wani NA, Ben Hur D, Migliolo L, Cardoso MH, Porat Z, Shimoni E, Franco OL, Shai Y. Interaction of Pexiganan (MSI-78)-Derived Analogues Reduces Inflammation and TLR4-Mediated Cytokine Secretion: A Comparative Study. ACS OMEGA 2023; 8:17856-17868. [PMID: 37251186 PMCID: PMC10210221 DOI: 10.1021/acsomega.3c00850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 04/28/2023] [Indexed: 05/31/2023]
Abstract
Antibiotic-resistant bacterial infections have increased the prevalence of sepsis and septic shock mortality worldwide and have become a global concern. Antimicrobial peptides (AMPs) show remarkable properties for developing new antimicrobial agents and host response modulatory therapies. A new series of AMPs derived from pexiganan (MSI-78) were synthesized. The positively charged amino acids were segregated at their N- and C-termini, and the rest of the amino acids created a hydrophobic core surrounded by positive charges and were modified to simulate the lipopolysaccharide (LPS). The peptides were investigated for their antimicrobial activity and LPS-induced cytokine release inhibition profile. Various biochemical and biophysical methods were used, including attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy, microscale thermophoresis (MST), and electron microscopy. Two new AMPs, MSI-Seg-F2F and MSI-N7K, preserved their neutralizing endotoxin activity while reducing toxicity and hemolytic activity. Combining all of these properties makes the designed peptides potential candidates to eradicate bacterial infection and detoxify LPS, which might be useful for sepsis treatment.
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Affiliation(s)
- Hadar Cohen
- Department
of Biomolecular Sciences, The Weizmann Institute
of Science, Rehovot 76100, Israel
| | - Naiem Ahmad Wani
- Department
of Biomolecular Sciences, The Weizmann Institute
of Science, Rehovot 76100, Israel
| | - Daniel Ben Hur
- Department
of Biomolecular Sciences, The Weizmann Institute
of Science, Rehovot 76100, Israel
| | - Ludovico Migliolo
- Departamento
de Engenharia Sanitária e Ambiental, Universidade Católica Dom Bosco, Campo Grande 79117-900, Brazil
| | - Marlon H. Cardoso
- S-Inova,
Programa de Pós-Graduação em Biotecnologia, Universidade Católica Dom Bosco, Campo Grande 79117900, MS, Brazil
- Centro
de
Análises Proteômicas e Bioquímicas, Pós-Graduação
em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília 70790160, DF, Brazil
- Instituto
de Biociências (INBIO), Universidade
Federal de Mato Grosso do Sul, Cidade Universitária, Campo Grande 79070900, Mato Grosso do Sul, Brazil
| | - Ziv Porat
- The
Department of Life Sciences Core Facilities, The Weizmann Institute of Science, Rehovot 76100, Israel
| | - Eyal Shimoni
- Department
of Chemical Research Support, The Weizmann
Institute of Science, Rehovot 76100, Israel
| | - Octavio Luiz Franco
- Departamento
de Engenharia Sanitária e Ambiental, Universidade Católica Dom Bosco, Campo Grande 79117-900, Brazil
- S-Inova,
Programa de Pós-Graduação em Biotecnologia, Universidade Católica Dom Bosco, Campo Grande 79117900, MS, Brazil
- Centro
de
Análises Proteômicas e Bioquímicas, Pós-Graduação
em Ciências Genômicas e Biotecnologia, Universidade Católica de Brasília, Brasília 70790160, DF, Brazil
| | - Yechiel Shai
- Department
of Biomolecular Sciences, The Weizmann Institute
of Science, Rehovot 76100, Israel
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9
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Cheng J, Ahmad B, Raza MA, Guo H, Ahmat M, Wei X, Zhang L, Li Z, Cheng Q, Zhang J, Wang J, Si D, Zhang Y, Zhang R. Yeast Expressed Hybrid Peptide CLP Abridged Pro-Inflammatory Cytokine Levels by Endotoxin Neutralization. Microorganisms 2023; 11:microorganisms11010131. [PMID: 36677423 PMCID: PMC9860938 DOI: 10.3390/microorganisms11010131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Revised: 12/28/2022] [Accepted: 12/28/2022] [Indexed: 01/06/2023] Open
Abstract
The aim of this study was to apply a strategy to express a recombinant CLP peptide and explore its application as a product derived from natural compounds. The amphiphilic CLP peptide was hybridized from three parent peptides (CM4, LL37, and TP5) and was considered to have potent endotoxin-neutralizing activity with minimal cytotoxic and hemolytic activity. To achieve high secretion expression, an expression vector of pPICZαA-HSA-CLP was constructed by the golden gate cloning strategy before being transformed into Pichia pastoris and integrated into the genome. The recombinant CLP was purified through the Ni-NTA affinity chromatography and analyzed by SDS-PAGE and mass spectrometry. The Limulus amebocyte lysate (LAL) test exhibited that the hybrid peptide CLP inhibited lipopolysaccharides (LPS) in a dose-dependent manner and was significantly (p < 0.05) more efficient compared to the parent peptides. In addition, it essentially diminished (p < 0.05) the levels of nitric oxide and pro-inflammatory cytokines (including TNF-α, IL6, and IL-1β) in LPS-induced mouse RAW264.7 macrophages. As an attendant to the control and the parental peptide LL37, the number of LPS-induced apoptotic cells was diminished compared to the control parental peptide LL37 (p < 0.05) with the treatment of CLP. Consequently, we concluded that the hybrid peptide CLP might be used as a therapeutic agent.
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Affiliation(s)
- Junhao Cheng
- Laboratory of Feed Biotechnology, State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Baseer Ahmad
- Laboratory of Feed Biotechnology, State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
- Faculty of Veterinary and Animal Sciences, Muhammad Nawaz Shareef University of Agriculture, Multan 2500, Pakistan
| | - Muhammad Asif Raza
- Faculty of Veterinary and Animal Sciences, Muhammad Nawaz Shareef University of Agriculture, Multan 2500, Pakistan
| | - Henan Guo
- Laboratory of Feed Biotechnology, State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Marhaba Ahmat
- Laboratory of Feed Biotechnology, State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Xubiao Wei
- School of Pharmaceutical Sciences, Tsinghua University, Beijing 100193, China
- Tsinghua-Peking Center for Life Sciences, Beijing 100193, China
| | - Lulu Zhang
- School of Pharmaceutical Sciences, Tsinghua University, Beijing 100193, China
- Tsinghua-Peking Center for Life Sciences, Beijing 100193, China
| | - Zhongxuan Li
- College of Bioengineering, Sichuan University of Science & Engineering, Chengdu 610017, China
| | - Qiang Cheng
- Laboratory of Feed Biotechnology, State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Jing Zhang
- Laboratory of Feed Biotechnology, State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Junyong Wang
- Laboratory of Feed Biotechnology, State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Dayong Si
- Laboratory of Feed Biotechnology, State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
| | - Yueping Zhang
- Laboratory of Feed Biotechnology, State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
- Correspondence: (Y.Z.); (R.Z.)
| | - Rijun Zhang
- Laboratory of Feed Biotechnology, State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, College of Veterinary Medicine, China Agricultural University, Beijing 100193, China
- Correspondence: (Y.Z.); (R.Z.)
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10
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Xu S, Guo L, Shao W, Liang L, Shu T, Zhang Y, Huang H, Guo G, Zhang Q, Sun P. Vagus nerve stimulation protects against cerebral injury after cardiopulmonary resuscitation by inhibiting inflammation through the TLR4/NF-κB and α7nAChR/JAK2 signaling pathways. World J Emerg Med 2023; 14:462-470. [PMID: 37969224 PMCID: PMC10632751 DOI: 10.5847/wjem.j.1920-8642.2023.102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 06/20/2023] [Indexed: 11/17/2023] Open
Abstract
BACKGROUND Our previous research proved that vagus nerve stimulation (VNS) improved the neurological outcome after cardiopulmonary resuscitation (CPR) by activating α7 nicotinic acetylcholine receptor (α7nAChR) in a rat model, but the underlying mechanism of VNS in neuroprotection after CPR remains unclear. METHODS In vivo, we established a mouse model of cardiac arrest (CA)/CPR to observe the survival rate, and the changes in inflammatory factors and brain tissue after VNS treatment. In vitro, we examined the effects of α7nAChR agonist on ischemia/reperfusion (I/R)-induced inflammation in BV2 cells under oxygen-glucose deprivation/reoxygenation (OGD/R) conditions. We observed the changes in cell survival rate, the levels of inflammatory factors, and the expressions of α7nAChR/Janus kinase 2 (JAK2) and toll-like receptor 4 (TLR4) /nuclear factor-κB (NF-κB). RESULTS In vivo, VNS preconditioning enhanced functional recovery, improved the survival rate, and reduced hippocampal CA1 cell damage, and the levels of inflammatory mediators after CA/CPR. The application of α7nAChR agonists provided similar effects against cerebral injury after the return of spontaneous circulation (ROSC), while α7nAChR antagonists reversed these neuroprotective impacts. The in vitro results mostly matched the findings in vivo. OGD/R increased the expression of tumor necrosis factor-alpha (TNF-α), TLR4 and NF-κB p65. When nicotine was added to the OGD/R model, the expression of TLR4, NF-κB p65, and TNF-α decreased, while the phosphorylation of JAK2 increased, which was prevented by preconditioning with α7nAChR or JAK2 antagonists. CONCLUSION The neuroprotective effect of VNS correlated with the activation of α7nAChR. VNS may alleviate cerebral IR injury by inhibiting TLR4/NF-κB and activating the α7nAChR/JAK2 signaling pathway.
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Affiliation(s)
- Shuang Xu
- Department of Emergency Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Lang Guo
- Department of Urology, the Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510000, China
| | - Weijing Shao
- Department of Emergency Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Licai Liang
- Department of Emergency Medicine, the Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou 310009, China
| | - Tingting Shu
- Department of Intensive Care Unit, Wuhan Hospital of Traditional Chinese Medicine, Wuhan 430000, China
| | - Yuhan Zhang
- Department of Intensive Care Unit, Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science, Xiangyang 441021, China
| | - He Huang
- Department of Emergency, General Hospital of Central Theatre Command of the Chinese People’s Liberation Army, Wuhan 430070, China
| | - Guangqi Guo
- Department of Emergency Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Qing Zhang
- Department of Anesthesiology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Peng Sun
- Department of Emergency Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
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11
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Stephens M. The emerging potential of Aptamers as therapeutic agents in infection and inflammation. Pharmacol Ther 2022; 238:108173. [DOI: 10.1016/j.pharmthera.2022.108173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 03/10/2022] [Accepted: 03/15/2022] [Indexed: 10/18/2022]
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12
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Rosini AM, Teixeira SC, Milian ICB, Silva RJ, de Souza G, Luz LC, Gomes AO, Mineo JR, Mineo TWP, Ferro EAV, Barbosa BF. LPS-mediated activation of TLR4 controls Toxoplasma gondii growth in human trophoblast cell (BeWo) and human villous explants in a dependent-manner of TRIF, MyD88, NF-κB and cytokines. Tissue Cell 2022; 78:101907. [DOI: 10.1016/j.tice.2022.101907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Revised: 06/22/2022] [Accepted: 08/22/2022] [Indexed: 02/07/2023]
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13
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Beyoğlu D, Idle JR. The gut microbiota - a vehicle for the prevention and treatment of hepatocellular carcinoma. Biochem Pharmacol 2022; 204:115225. [PMID: 35998677 DOI: 10.1016/j.bcp.2022.115225] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2022] [Revised: 08/15/2022] [Accepted: 08/16/2022] [Indexed: 12/24/2022]
Abstract
Hepatocellular carcinoma (HCC) arises principally against a background of cirrhosis and these two diseases are responsible globally for over 2 million deaths a year. There are few treatment options for liver cirrhosis and HCC, so it is vital to arrest these pathologies early in their development. To do so, we propose dietary and therapeutic solutions that involve the gut microbiota and its consequences. Integrated dietary, environmental and intrinsic signals result in a bidirectional connection between the liver and the gut with its microbiota, known as the gut-liver axis. Numerous lifestyle factors can result in dysbiosis with a change in the functional composition and metabolic activity of the microbiota. A panoply of metabolites can be produced by the microbiota, including ethanol, secondary bile acids, trimethylamine, indole, quinolone, phenazine and their derivatives and the quorum sensor acyl homoserine lactones that may contribute to HCC but have yet to be fully investigated. Gram-negative bacteria can activate the pattern recognition receptor toll-like receptor 4 (TLR4) in the liver leading to nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) signaling, which can contribute to HCC initiation and progression. The goal in preventing HCC should be to ensure a healthy gut microbiota using probiotic supplements containing beneficial bacteria and prebiotic plant fibers such as oligosaccharides that stimulate their growth. The clinical development of TLR4 antagonists is urgently needed to counteract the pathological effects of dysbiosis on the liver and other organs. Further nutrigenomic studies are required to understand better how the diet influences the gut microbiota and its adverse effects on the liver.
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Affiliation(s)
- Diren Beyoğlu
- Arthur G. Zupko Institute for Systems Pharmacology and Pharmacogenomics, Arnold and Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, Brooklyn, New York 11201, USA
| | - Jeffrey R Idle
- Arthur G. Zupko Institute for Systems Pharmacology and Pharmacogenomics, Arnold and Marie Schwartz College of Pharmacy and Health Sciences, Long Island University, Brooklyn, New York 11201, USA.
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14
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Balan I, Aurelian L, Williams KS, Campbell B, Meeker RB, Morrow AL. Inhibition of human macrophage activation via pregnane neurosteroid interactions with toll-like receptors: Sex differences and structural requirements. Front Immunol 2022; 13:940095. [PMID: 35967446 PMCID: PMC9373802 DOI: 10.3389/fimmu.2022.940095] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 07/07/2022] [Indexed: 11/13/2022] Open
Abstract
We recently discovered that (3α,5α)3-hydroxypregnan-20-one (allopregnanolone) inhibits pro-inflammatory toll-like receptor (TLR) activation and cytokine/chemokine production in mouse macrophage RAW264.7 cells. The present studies evaluate neurosteroid actions upon TLR activation in human macrophages from male and female healthy donors. Buffy coat leukocytes were obtained from donors at the New York Blood Center (http://nybloodcenter.org/), and peripheral blood mononuclear cells were isolated and cultured to achieve macrophage differentiation. TLR4 and TLR7 were activated by lipopolysaccharide (LPS) or imiquimod in the presence/absence of allopregnanolone or related neurosteroids and pro-inflammatory markers were detected by ELISA or western blotting. Cultured human monocyte-derived-macrophages exhibited typical morphology, a mixed immune profile of both inflammatory and anti-inflammatory markers, with no sex difference at baseline. Allopregnanolone inhibited TLR4 activation in male and female donors, preventing LPS-induced elevations of TNF-α, MCP-1, pCREB and pSTAT1. In contrast, 3α,5α-THDOC and SGE-516 inhibited the TLR4 pathway activation in female, but not male donors. Allopregnanolone completely inhibited TLR7 activation by imiquimod, blocking IL-1-β, IL-6, pSTAT1 and pIRF7 elevations in females only. 3α,5α-THDOC and SGE-516 partially inhibited TLR7 activation, only in female donors. The results indicate that allopregnanolone inhibits TLR4 and TLR7 activation in cultured human macrophages resulting in diminished cytokine/chemokine production. Allopregnanolone inhibition of TLR4 activation was found in males and females, but inhibition of TLR7 signals exhibited specificity for female donors. 3α,5α-THDOC and SGE-516 inhibited TLR4 and TLR7 pathways only in females. These studies demonstrate anti-inflammatory effects of allopregnanolone in human macrophages for the first time and suggest that inhibition of pro-inflammatory cytokines/chemokines may contribute to its therapeutic actions.
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Affiliation(s)
- Irina Balan
- Department of Psychiatry, Department of Pharmacology, Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, United States
| | - Laure Aurelian
- Stanford University School of Medicine, Stanford, CA, United States
| | - Kimberly S. Williams
- Department of Neurology, University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, United States
| | - Brian Campbell
- Translational Sciences, Sage Therapeutics Inc., Cambridge, MA, United States
| | - Rick B. Meeker
- Department of Neurology, University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, United States
| | - A. Leslie Morrow
- Department of Psychiatry, Department of Pharmacology, Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, United States
- *Correspondence: A. Leslie Morrow,
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15
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Kingren MS, Starr ME, Saito H. Divergent Sepsis Pathophysiology in Older Adults. Antioxid Redox Signal 2021; 35:1358-1375. [PMID: 34210173 PMCID: PMC8905233 DOI: 10.1089/ars.2021.0056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Revised: 06/25/2021] [Accepted: 06/27/2021] [Indexed: 12/12/2022]
Abstract
Significance: Both incidence and mortality rates of sepsis significantly increase with advanced age, and the majority of sepsis patients are late middle-aged or older. With the proportion of older adults rapidly increasing in developed countries, age-dependent sepsis vulnerability is an urgent medical issue. Due to an increasing life expectancy, postsepsis complications and health care costs are expected to increase as well. Recent Advances: Older patients suffer from higher sepsis incidence and mortality rates, likely resulting from frequent comorbidities, increased coagulation, dysgylcemia, and altered immune responses. Critical Issues: Despite a large number of ongoing clinical and basic research studies, there is currently no effective therapeutic strategy targeting older patients with severe sepsis. The disparity between clinical and basic studies is a problem, and this is largely due to the use of animal models lacking clinical relevance. Although the majority of sepsis cases occur in older adults, most laboratory animals used for sepsis research are very young. Further, despite the wide use of combination fluid and antibiotic treatment in intensive care unit (ICU) patients, most animal research does not include such treatment. Future Directions: Because sepsis is a systemic disease with multiple organ dysfunction, combined therapy approaches, not those targeting single pathways or single organs, are essential. As for preclinical research, it is critical to confirm new findings using aged animal models with clinically relevant ICU-like medical treatments. Antioxid. Redox Signal. 35, 1358-1375.
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Affiliation(s)
- Meagan S. Kingren
- Aging and Critical Care Research Laboratory, Departments of University of Kentucky, Lexington, Kentucky, USA
- Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, Kentucky, USA
| | - Marlene E. Starr
- Aging and Critical Care Research Laboratory, Departments of University of Kentucky, Lexington, Kentucky, USA
- Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, Kentucky, USA
- Surgery, University of Kentucky, Lexington, Kentucky, USA
| | - Hiroshi Saito
- Aging and Critical Care Research Laboratory, Departments of University of Kentucky, Lexington, Kentucky, USA
- Pharmacology and Nutritional Sciences, University of Kentucky, Lexington, Kentucky, USA
- Surgery, University of Kentucky, Lexington, Kentucky, USA
- Physiology, University of Kentucky, Lexington, Kentucky, USA
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16
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Li WH, Liu YL, Lun JC, He YM, Tang LP. Heat stress inhibits TLR4-NF-κB and TLR4-TBK1 signaling pathways in broilers infected with Salmonella Typhimurium. INTERNATIONAL JOURNAL OF BIOMETEOROLOGY 2021; 65:1895-1903. [PMID: 34061266 PMCID: PMC8536552 DOI: 10.1007/s00484-021-02146-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 04/14/2021] [Accepted: 05/05/2021] [Indexed: 05/29/2023]
Abstract
With the global warming, the harm of heat stress (HS) to the breeding industry has become more common, which causes the decline of animal production performance and low immunity. This study aimed to analyze the effect of HS on the intestinal immune function of Salmonella-infected chickens. Fourteen-day-old broilers were divided into the following four groups of eight replicates: control (Control), heat stress (HS), Salmonella Typhimurium (ST), and heat stress + Salmonella Typhimurium (HS+ST). The broilers were subjected to a heat stress of 35 °C from 15 to 28 days of age. Salmonella Typhimurium (ST, 14028, 109 cfu/mL) was inoculated, via oral administration at 29 days of age, into ST and HS+ST group birds. On the 4th day after Salmonella Typhimurium administration, an increase in jejunum IgA levels was observed in chickens infected with Salmonella Typhimurium. Mechanistic regulation of TLR4-NFκB-NLRP3 and TLR4-TBK1 signaling by heat stress was evaluated in Salmonella Typhimurium-infected broilers. Heat stress markedly inhibited the expression of cytokines including TNF-α, IL-6, IL-1β, NLRP3, caspase-1, NF-κB-p65, and p-NF-κB-p65, and the TLR4-TBK1 cytokines IFN-α, IFN-γ, p-IRF3, and p-TBK1 in jejunum of broilers infected with Salmonella Typhimurium. Collectively, our results demonstrate that heat stress can inhibit intestinal immune response by downregulating the expression of TLR4-NFκB-NLRP3 and TLR4-TBK1 signaling pathways in broilers infected with Salmonella Typhimurium.
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Affiliation(s)
- Wei-Hao Li
- School of Life Science and Engineering, Foshan University, Foshan, 528225, China
| | - Yi-Lei Liu
- School of Life Science and Engineering, Foshan University, Foshan, 528225, China
| | - Jian-Chi Lun
- School of Life Science and Engineering, Foshan University, Foshan, 528225, China
| | - Yong-Ming He
- School of Life Science and Engineering, Foshan University, Foshan, 528225, China
| | - Lu-Ping Tang
- School of Life Science and Engineering, Foshan University, Foshan, 528225, China.
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17
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TLR4 and TNFR1 blockade dampen M1 macrophage activation and shifts them towards an M2 phenotype. Immunol Res 2021; 69:334-351. [PMID: 34235623 DOI: 10.1007/s12026-021-09209-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Accepted: 06/16/2021] [Indexed: 12/18/2022]
Abstract
The Gram-negative bacterial lipopolysaccharide (LPS)-induced sepsis has emerged as major concern worldwide due to the pressing need to develop its effective treatment strategies which is not available yet. LPS is the major causative agent in the pathogenesis of septic shock. In macrophages, LPS interacts with cell surface TLR4 leading to reactive oxygen species (ROS), TNF-α, IL-1β production, oxidative stress and markedly activated the MAPKs and NF-kB pathway. Post cell isolation, the macrophages were subjected to administration with neutralizing antibodies to TLR4 and TNFR1 either alone or in combination prior to LPS challenge. Subsequently, we performed flow cytometric analysis along with Western blots, reactive oxygen species production, and TNF-α, IL-1β release. Outcomes suggested that the dual blockade of TLR4 and TNFR1 was indeed beneficial in shifting the LPS-induced M1 polarization towards M2. Both TLR4 and TNFR1 exhibited dependency during LPS stimulation. Furthermore, the switch towards the M2 phenotype might be responsible for the decreased levels of TNF-α, IL-1β, NO, and superoxide anion and the simultaneous elevation in the activity level of anti-oxidant enzymes like SOD, CAT (catalase), and GSH content in the isolated peritoneal macrophages. Simultaneous blocking of both TLR4 and TNFR1 also showed reduced expression of NF-kB, JNK, and COX-2 by promoting TNFR2-mediated TNF-α signaling. The increased arginase activity further confirmed the polarization towards M2. Thus it may be inferred that dual blockade of TLR4 and TNFR1 might be an alternative therapeutic approach for regulating of sepsis in future.
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18
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AbdAllah NB, Toraih EA, Al Ageeli E, Elhagrasy H, Gouda NS, Fawzy MS, Helal GM. MYD88, NFKB1, and IL6 transcripts overexpression are associated with poor outcomes and short survival in neonatal sepsis. Sci Rep 2021; 11:13374. [PMID: 34183713 PMCID: PMC8238937 DOI: 10.1038/s41598-021-92912-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Accepted: 06/15/2021] [Indexed: 11/09/2022] Open
Abstract
Toll-like receptor (TLR) family signature has been implicated in sepsis etiopathology. We aimed to evaluate the genetic profile of TLR pathway-related key genes; the myeloid differentiation protein 88 (MYD88), IL1 receptor-associated kinase 1 (IRAK1), the nuclear factor kappa-B1 (NFKB1), and interleukin 6 (IL6) in the blood of neonates with sepsis at the time of admission and post-treatment for the available paired-samples. This case–control study included 124 infants with sepsis admitted to the neonatal intensive care unit and 17 controls. The relative gene expressions were quantified by TaqMan Real-Time qPCR and correlated to the clinic-laboratory data. MYD88, NFKB1, and IL6 relative expressions were significantly higher in sepsis cases than controls. Higher levels of MYD88 and IL6 were found in male neonates and contributed to the sex-based separation of the cases by the principal component analysis. ROC analysis revealed MYD88 and NFKB1 transcripts to be good biomarkers for sepsis. Furthermore, patients with high circulatory MYD88 levels were associated with poor survival, as revealed by Kaplan–Meier curves analysis. MYD88, NFKB1, and IL6 transcripts showed association with different poor-outcome manifestations. Clustering analysis split the patient cohort into three distinct groups according to their transcriptomic signature and CRP levels. In conclusion, the study TLR pathway-related transcripts have a gender-specific signature, diagnostic, and prognostic clinical utility in neonatal sepsis.
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Affiliation(s)
- Nouran B AbdAllah
- Department of Pediatrics, Faculty of Medicine, Suez Canal University, Ismailia, Egypt
| | - Eman A Toraih
- Department of Surgery, School of Medicine, Tulane University, New Orleans, LA, USA.,Genetics Unit, Department of Histology and Cell Biology, Faculty of Medicine, Suez Canal University, Ismailia, Egypt
| | - Essam Al Ageeli
- Department of Clinical Biochemistry (Medical Genetics), Faculty of Medicine, Jazan University, Jazan, Saudi Arabia
| | - Hala Elhagrasy
- Department of Pediatrics, Faculty of Medicine, Suez Canal University, Ismailia, Egypt
| | - Nawal S Gouda
- Department of Medical Microbiology and Immunology, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Manal S Fawzy
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Suez Canal University, Ismailia, Egypt. .,Department of Biochemistry, Faculty of Medicine, Northern Border University, Arar, Kingdom of Saudi Arabia.
| | - Ghada M Helal
- Department of Medical Biochemistry, Faculty of Medicine, Mansoura University, Mansoura, Egypt
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Riese J, Gromann A, Lührs F, Kleinwort A, Schulze T. Sphingosine-1-Phosphate Receptor Type 4 (S1P 4) Is Differentially Regulated in Peritoneal B1 B Cells upon TLR4 Stimulation and Facilitates the Egress of Peritoneal B1a B Cells and Subsequent Accumulation of Splenic IRA B Cells under Inflammatory Conditions. Int J Mol Sci 2021; 22:ijms22073465. [PMID: 33801658 PMCID: PMC8037865 DOI: 10.3390/ijms22073465] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 03/16/2021] [Accepted: 03/25/2021] [Indexed: 02/08/2023] Open
Abstract
Background: Gram-negative infections of the peritoneal cavity result in profound modifications of peritoneal B cell populations and induce the migration of peritoneal B cells to distant secondary lymphoid organs. However, mechanisms controlling the egress of peritoneal B cells from the peritoneal cavity and their subsequent trafficking remain incompletely understood. Sphingosine-1-phosphate (S1P)-mediated signaling controls migratory processes in numerous immune cells. The present work investigates the role of S1P-mediated signaling in peritoneal B cell trafficking under inflammatory conditions. Methods: Differential S1P receptor expression after peritoneal B cell activation was assessed semi‑quantitatively using RT-PCR in vitro. The functional implications of differential S1P1 and S1P4 expression were assessed by transwell migration in vitro, by adoptive peritoneal B cell transfer in a model of sterile lipopolysaccharide (LPS)‑induced peritonitis and in the polymicrobial colon ascendens stent peritonitis (CASP) model. Results: The two sphingosine-1-phosphate receptors (S1PRs) expressed in peritoneal B cell subsets S1P1 and S1P4 are differentially regulated upon stimulation with the TLR4 agonist LPS, but not upon PMA/ionomycin or B cell receptor (BCR) crosslinking. S1P4 deficiency affects both the trafficking of activated peritoneal B cells to secondary lymphoid organs and the positioning of these cells within the functional compartments of the targeted organ. S1P4 deficiency in LPS-activated peritoneal B cells results in significantly reduced numbers of splenic innate response activator B cells. Conclusions: The S1P-S1PR system is implicated in the trafficking of LPS-activated peritoneal B cells. Given the protective role of peritoneal B1a B cells in peritoneal sepsis, further experiments to investigate the impact of S1P4-mediated signaling on the severity and mortality of peritoneal sepsis are warranted.
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Affiliation(s)
- Janik Riese
- Experimental Surgical Research Laboratory, Department of General Surgery, Visceral, Thoracic and Vascular Surgery, Universitätsmedizin Greifswald, 17475 Greifswald, Germany
| | - Alina Gromann
- Experimental Surgical Research Laboratory, Department of General Surgery, Visceral, Thoracic and Vascular Surgery, Universitätsmedizin Greifswald, 17475 Greifswald, Germany
| | - Felix Lührs
- Experimental Surgical Research Laboratory, Department of General Surgery, Visceral, Thoracic and Vascular Surgery, Universitätsmedizin Greifswald, 17475 Greifswald, Germany
| | - Annabel Kleinwort
- Experimental Surgical Research Laboratory, Department of General Surgery, Visceral, Thoracic and Vascular Surgery, Universitätsmedizin Greifswald, 17475 Greifswald, Germany
| | - Tobias Schulze
- Experimental Surgical Research Laboratory, Department of General Surgery, Visceral, Thoracic and Vascular Surgery, Universitätsmedizin Greifswald, 17475 Greifswald, Germany
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20
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Liu F, Sheng S, Shao D, Xiao Y, Zhong Y, Zhou J, Quek CH, Wang Y, Hu Z, Liu H, Li Y, Tian H, Leong KW, Chen X. A Cationic Metal-Organic Framework to Scavenge Cell-Free DNA for Severe Sepsis Management. NANO LETTERS 2021; 21:2461-2469. [PMID: 33686851 PMCID: PMC8320336 DOI: 10.1021/acs.nanolett.0c04759] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Circulating cell-free DNA (cfDNA) released by damaged cells causes inflammation and has been associated with the progression of sepsis. One proposed strategy to treat sepsis is to scavenge this inflammatory circulating cfDNA. Here, we develop a cfDNA-scavenging nanoparticle (NP) that consists of cationic polyethylenimine (PEI) of different molecular weight grafted to zeolitic imidazolate framework-8 (PEI-g-ZIF) in a simple one-pot process. PEI-g-ZIF NPs fabricated using PEI 1800 and PEI 25k but not PEI 600 suppressed cfDNA-induced TLR activation and subsequent nuclear factor kappa B pathway activity. PEI 1800-g-ZIF NPs showed greater inhibition of cfDNA-associated inflammation and multiple organ injury than naked PEI 1800 (lacking ZIF), and had greater therapeutic efficacy in treating sepsis. These results indicate that PEI-g-ZIF NPs acts as a "nanotrap" that improves upon naked PEI in scavenging circulating cfDNA, reducing inflammation, and reversing the progression of sepsis, thus providing a novel strategy for sepsis treatment.
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Affiliation(s)
- Feng Liu
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- Department of Biomedical Engineering, Columbia University, New York City, New York 10027, United States
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Shu Sheng
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Dan Shao
- Institutes for Life Sciences, School of Biomedical Sciences and Engineering, South China University of Technology, Guangzhou International Campus, Guangzhou 510006, China
| | - Yongqiang Xiao
- Department of Biomedical Engineering, Columbia University, New York City, New York 10027, United States
| | - Yiling Zhong
- Department of Biomedical Engineering, Columbia University, New York City, New York 10027, United States
| | - Jie Zhou
- Department of Biomedical Engineering, Columbia University, New York City, New York 10027, United States
| | - Chai Hoon Quek
- Department of Biomedical Engineering, Columbia University, New York City, New York 10027, United States
| | - Yanbing Wang
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- University of Science and Technology of China, Hefei 230026, China
| | - Zhiming Hu
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Heshi Liu
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Yanhui Li
- School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China
| | - Huayu Tian
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- University of Science and Technology of China, Hefei 230026, China
| | - Kam W Leong
- Department of Biomedical Engineering, Columbia University, New York City, New York 10027, United States
| | - Xuesi Chen
- Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- University of Science and Technology of China, Hefei 230026, China
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21
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Balan I, Aurelian L, Schleicher R, Boero G, O'Buckley T, Morrow AL. Neurosteroid allopregnanolone (3α,5α-THP) inhibits inflammatory signals induced by activated MyD88-dependent toll-like receptors. Transl Psychiatry 2021; 11:145. [PMID: 33637705 PMCID: PMC7909379 DOI: 10.1038/s41398-021-01266-1] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 01/21/2021] [Accepted: 02/02/2021] [Indexed: 02/08/2023] Open
Abstract
We have shown that endogenous neurosteroids, including pregnenolone and 3α,5α-THP inhibit toll-like receptor 4 (TLR4) signal activation in mouse macrophages and the brain of alcohol-preferring (P) rat, which exhibits innate TLR4 signal activation. The current studies were designed to examine whether other activated TLR signals are similarly inhibited by 3α,5α-THP. We report that 3α,5α-THP inhibits selective agonist-mediated activation of TLR2 and TLR7, but not TLR3 signaling in the RAW246.7 macrophage cell line. The TLR4 and TLR7 signals are innately activated in the amygdala and NAc from P rat brains and inhibited by 3α,5α-THP. The TLR2 and TLR3 signals are not activated in P rat brain and they are not affected by 3α,5α-THP. Co-immunoprecipitation studies indicate that 3α,5α-THP inhibits the binding of MyD88 with TLR4 or TLR7 in P rat brain, but the levels of TLR4 co-precipitating with TRIF are not altered by 3α,5α-THP treatment. Collectively, the data indicate that 3α,5α-THP inhibits MyD88- but not TRIF-dependent TLR signal activation and the production of pro-inflammatory mediators through its ability to block TLR-MyD88 binding. These results have applicability to many conditions involving pro-inflammatory TLR activation of cytokines, chemokines, and interferons and support the use of 3α,5α-THP as a therapeutic for inflammatory disease.
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Affiliation(s)
- Irina Balan
- Department of Psychiatry, Department of Pharmacology, Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, 27599, USA
| | - Laure Aurelian
- Stanford University School of Medicine, Stanford, CA, 94305, USA
| | - Riana Schleicher
- Department of Psychiatry, Department of Pharmacology, Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, 27599, USA
| | - Giorgia Boero
- Department of Psychiatry, Department of Pharmacology, Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, 27599, USA
| | - Todd O'Buckley
- Department of Psychiatry, Department of Pharmacology, Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, 27599, USA
| | - A Leslie Morrow
- Department of Psychiatry, Department of Pharmacology, Bowles Center for Alcohol Studies, University of North Carolina at Chapel Hill, School of Medicine, Chapel Hill, NC, 27599, USA.
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22
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Dolmatova EV, Wang K, Mandavilli R, Griendling KK. The effects of sepsis on endothelium and clinical implications. Cardiovasc Res 2021; 117:60-73. [PMID: 32215570 PMCID: PMC7810126 DOI: 10.1093/cvr/cvaa070] [Citation(s) in RCA: 97] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 02/03/2020] [Accepted: 03/20/2020] [Indexed: 12/15/2022] Open
Abstract
ABSTRACT Sepsis accounts for nearly 700 000 deaths in Europe annually and is caused by an overwhelming host response to infection resulting in organ failure. The endothelium is an active contributor to sepsis and as such represents a major target for therapy. During sepsis, endothelial cells amplify the immune response and activate the coagulation system. They are both a target and source of inflammation and serve as a link between local and systemic immune responses. In response to cytokines produced by immune cells, the endothelium expresses adhesion molecules and produces vasoactive compounds, inflammatory cytokines, and chemoattractants, thus switching from an anticoagulant to procoagulant state. These responses contribute to local control of infection, but systemic activation can lead to microvascular thrombosis, capillary permeability, hypotension, tissue hypoxia, and ultimately tissue damage. This review focuses on the role of the endothelium in leucocyte adhesion and transmigration as well as production of reactive oxygen and nitrogen species, microRNAs and cytokines, formation of signalling microparticles, and disseminated intravascular coagulation. We also discuss alterations in endothelial permeability and apoptosis. Finally, we review the diagnostic potential of endothelial markers and endothelial pathways as therapeutic targets for this devastating disease.
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Affiliation(s)
- Elena V Dolmatova
- Division of Cardiology, Department of Medicine, Emory University, 101 Woodruff Circle, Atlanta, GA 30322, USA
| | - Keke Wang
- Division of Cardiology, Department of Medicine, Emory University, 101 Woodruff Circle, Atlanta, GA 30322, USA
| | - Rohan Mandavilli
- Division of Cardiology, Department of Medicine, Emory University, 101 Woodruff Circle, Atlanta, GA 30322, USA
| | - Kathy K Griendling
- Division of Cardiology, Department of Medicine, Emory University, 101 Woodruff Circle, Atlanta, GA 30322, USA
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23
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Korgaonkar AA, Li Y, Sekhar D, Subramanian D, Guevarra J, Swietek B, Pallottie A, Singh S, Kella K, Elkabes S, Santhakumar V. Toll-like Receptor 4 Signaling in Neurons Enhances Calcium-Permeable α-Amino-3-Hydroxy-5-Methyl-4-Isoxazolepropionic Acid Receptor Currents and Drives Post-Traumatic Epileptogenesis. Ann Neurol 2020; 87:497-515. [PMID: 32031699 DOI: 10.1002/ana.25698] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2019] [Revised: 02/03/2020] [Accepted: 02/05/2020] [Indexed: 02/06/2023]
Abstract
OBJECTIVE Traumatic brain injury is a major risk factor for acquired epilepsies, and understanding the mechanisms underlying the early pathophysiology could yield viable therapeutic targets. Growing evidence indicates a role for inflammatory signaling in modifying neuronal excitability and promoting epileptogenesis. Here we examined the effect of innate immune receptor Toll-like receptor 4 (TLR4) on excitability of the hippocampal dentate gyrus and epileptogenesis after brain injury. METHODS Slice and in vivo electrophysiology and Western blots were conducted in rats subject to fluid percussion brain injury or sham injury. RESULTS The studies identify that TLR4 signaling in neurons augments dentate granule cell calcium-permeable α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor (CP-AMPAR) currents after brain injury. Blocking TLR4 signaling in vivo shortly after brain injury reduced dentate network excitability and seizure susceptibility. When blocking of TLR4 signaling after injury was delayed, however, this treatment failed to reduce postinjury seizure susceptibility. Furthermore, TLR4 signal blocking was less efficacious in limiting seizure susceptibility when AMPAR currents, downstream targets of TLR4 signaling, were transiently enhanced. Paradoxically, blocking TLR4 signaling augmented both network excitability and seizure susceptibility in uninjured controls. Despite the differential effect on seizure susceptibility, TLR4 antagonism suppressed cellular inflammatory responses after injury without impacting sham controls. INTERPRETATION These findings demonstrate that independently of glia, the immune receptor TLR4 directly regulates post-traumatic neuronal excitability. Moreover, the TLR4-dependent early increase in dentate excitability is causally associated with epileptogenesis. Identification and selective targeting of the mechanisms underlying the aberrant TLR4-mediated increase in CP-AMPAR signaling after injury may prevent epileptogenesis after brain trauma. ANN NEUROL 2020;87:497-515.
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Affiliation(s)
- Akshata A Korgaonkar
- Department of Pharmacology, Physiology, and Neuroscience, Rutgers New Jersey Medical School, Newark, NJ
| | - Ying Li
- Department of Pharmacology, Physiology, and Neuroscience, Rutgers New Jersey Medical School, Newark, NJ
| | - Dipika Sekhar
- Department of Pharmacology, Physiology, and Neuroscience, Rutgers New Jersey Medical School, Newark, NJ.,Department of Molecular, Cell, and Systems Biology, University of California Riverside, Riverside, CA
| | - Deepak Subramanian
- Department of Pharmacology, Physiology, and Neuroscience, Rutgers New Jersey Medical School, Newark, NJ.,Department of Molecular, Cell, and Systems Biology, University of California Riverside, Riverside, CA
| | - Jenieve Guevarra
- Department of Pharmacology, Physiology, and Neuroscience, Rutgers New Jersey Medical School, Newark, NJ
| | - Bogumila Swietek
- Department of Pharmacology, Physiology, and Neuroscience, Rutgers New Jersey Medical School, Newark, NJ
| | - Alexandra Pallottie
- Department of Neurological Surgery, Rutgers New Jersey Medical School, Newark, NJ
| | - Sukwinder Singh
- Department of Pathology and Laboratory Medicine, Rutgers New Jersey Medical School, Newark, NJ
| | - Kruthi Kella
- Department of Pharmacology, Physiology, and Neuroscience, Rutgers New Jersey Medical School, Newark, NJ
| | - Stella Elkabes
- Department of Neurological Surgery, Rutgers New Jersey Medical School, Newark, NJ
| | - Vijayalakshmi Santhakumar
- Department of Pharmacology, Physiology, and Neuroscience, Rutgers New Jersey Medical School, Newark, NJ.,Department of Molecular, Cell, and Systems Biology, University of California Riverside, Riverside, CA
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24
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RM, a novel resveratrol derivative, attenuates inflammatory responses induced by lipopolysaccharide via selectively increasing the Tollip protein in macrophages: A partial mechanism with therapeutic potential in an inflammatory setting. Int Immunopharmacol 2020; 78:106072. [DOI: 10.1016/j.intimp.2019.106072] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 11/07/2019] [Accepted: 11/21/2019] [Indexed: 02/08/2023]
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25
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Zhong X, Xiao Q, Liu Z, Wang W, Lai CH, Yang W, Yue P, Ye Q, Xiao J. TAK242 suppresses the TLR4 signaling pathway and ameliorates DCD liver IRI in rats. Mol Med Rep 2019; 20:2101-2110. [PMID: 31257518 PMCID: PMC6691197 DOI: 10.3892/mmr.2019.10439] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Accepted: 04/30/2019] [Indexed: 12/20/2022] Open
Abstract
Ischemia-reperfusion injury (IRI) is a notable cause of tissue damage during surgical procedures and a major risk factor in graft dysfunction in liver transplantation. Livers obtained from donors after circulatory death (DCD) are prone to IRI and toll-like receptor 4 (TLR4) serves a prominent role in the inflammatory response associated with DCD liver IRI. The present study was designed to investigate whether TAK242, a specific TLR4 inhibitor, improves hepatic IRI following a DCD graft and to investigate its underlying protective mechanisms. Male Sprague-Dawley rats were randomized into 4 groups: Control, TAK242, DCD and DCD+TAK242 groups. Rats were pretreated with TAK242 or its vehicle for 30 min, then the livers were harvested without warm ischemia (control group and TAK242 group) or with warm ischemia in situ for 30 min. The livers were stored in cold University of Wisconsin solution for 24 h and subsequently perfused for 60 min with an isolated perfused rat liver system. Rat liver injury was evaluated thereafter. When compared with the DCD group, DCD livers with TAK242 pretreatment displayed significantly improved hepatic tissue injury and less tissue necrosis (P<0.05). Compared with DCD livers, mechanistic experiments revealed that TAK242 pretreatment alleviated mitochondrial dysfunction, reduced reactive oxygen species and malondialdehyde levels and inhibited apoptosis. Additionally, TAK242 significantly inhibited the IRI-associated inflammatory response, indicated by the decreased expression of TLR4, interleukin (IL)-1β, IL-6 and cyclooxygenase 2 at the mRNA and protein levels (P<0.05). TAK242 ameliorates DCD liver IRI via suppressing the TLR4 signaling pathway in rats. The results of the present study have revealed that TAK242 pretreatment harbors a potential benefit for liver transplantation.
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Affiliation(s)
- Xiang Zhong
- Department of General Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Qi Xiao
- Department of General Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
| | - Zhongzhong Liu
- Department of Hepatobiliary Diseases, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Wei Wang
- Department of Hepatobiliary Diseases, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Chin-Hui Lai
- Department of Hepatobiliary Diseases, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Wang Yang
- Department of Hepatobiliary Diseases, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Pengpeng Yue
- Department of Hepatobiliary Diseases, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Qifa Ye
- Department of Hepatobiliary Diseases, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China
| | - Jiansheng Xiao
- Department of General Surgery, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi 330006, P.R. China
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26
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Slomiany BL, Slomiany A. Syk: a new target for attenuation of Helicobacter pylori-induced gastric mucosal inflammatory responses. Inflammopharmacology 2019; 27:203-211. [PMID: 30820719 DOI: 10.1007/s10787-019-00577-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 02/19/2019] [Indexed: 02/07/2023]
Abstract
The magnitude of gastric mucosal inflammatory response to H. pylori relies primarily on the extent of its key endotoxin, LPS, engagement of Toll-like receptor-4 (TLR4) and the initiation of signal transduction events converging on mitogen-activated protein kinase (MAPK) and IκB complex (IKK) cascades. These cascades, in turn, exert their control over the assembly of transcription factors, NFκB and AP1, implicated in the induction of the expression of iNOS and COX-2 proinflammatory genes. The LPS-induced TLR4 activation and the ensuing phosphorylation of its intracellular tyrosine domain by Src-family kinases not only leads to recruitment to the cytoplasmic domain of TLR4 of adaptor molecules directly involved in propagation of the signaling cascades converging on MAPK and IKK, but also provides a propitious docking site for a non-receptor tyrosine kinase, spleen tyrosine kinase (Syk), the activation of which apparently leads to upregulation in the expression of proinflammatory genes. Here, we review the pathways engaged by H. pylori in the recruitment and interaction of Syk with TLR4 in gastric mucosa, and discuss the cascades involved in Syk-mediated amplification in proinflammatory signaling. We focus, moreover, on the potential role of drugs targeting Syk and TLR4 in the treatment of H. pylori-related gastric disease.
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Affiliation(s)
- Bronislaw L Slomiany
- Research Center, C855, Rutgers School of Dental Medicine, Rutgers, The State University of New Jersey, 110 Bergen Street, PO Box 1709, Newark, NJ, 07103-2400, USA.
| | - Amalia Slomiany
- Research Center, C855, Rutgers School of Dental Medicine, Rutgers, The State University of New Jersey, 110 Bergen Street, PO Box 1709, Newark, NJ, 07103-2400, USA
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27
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Das P, Panda SK, Agarwal B, Behera S, Ali SM, Pulse ME, Solomkin JS, Opal SM, Bhandari V, Acharya S. Novel Chitohexaose Analog Protects Young and Aged mice from CLP Induced Polymicrobial Sepsis. Sci Rep 2019; 9:2904. [PMID: 30814582 PMCID: PMC6393422 DOI: 10.1038/s41598-019-38731-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 12/31/2018] [Indexed: 02/06/2023] Open
Abstract
In Gram-negative bacterial sepsis, production of excess pro-inflammatory cytokines results in hyperinflammation and tissue injury. Anti-inflammatory cytokines such as IL-10 inhibit inflammation and enhance tissue healing. Here, we report a novel approach to treat septicemia associated with intra-abdominal infection in a murine model by delicately balancing pro- and anti-inflammatory cytokines. A novel oligosaccharide compound AVR-25 selectively binds to the TLR4 protein (IC50 = 0.15 µM) in human peripheral blood monocytes and stimulates IL-10 production. Following the cecal ligation and puncture (CLP) procedure, intravenous dosing of AVR-25 (10 mg/kg, 6-12 h post-CLP) alone and in combination with antibiotic imipenem protected both young adult (10-12 week old) and aged (16-18 month old) mice against polymicrobial infection, organ dysfunction, and death. Proinflammatory cytokines (TNF-α, MIP-1, i-NOS) were decreased significantly and restoration of tissue damage was observed in all organs. A decrease in serum C-reactive protein (CRP) and bacterial colony forming unit (CFU) confirmed improved bacterial clearance. Together, these findings demonstrate the therapeutic ability of AVR-25 to mitigate the storm of inflammation and minimize tissue injury with high potential for adjunctive therapy in intra-abdominal sepsis.
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Affiliation(s)
- Pragnya Das
- Department of Pediatrics, Division of Neonatology, Drexel University School of Medicine, Philadelphia, PA, 19102, USA
| | - Santosh K Panda
- School of Medicine, Washington University, St. Louis, MO, 63110, USA
| | | | - Sumita Behera
- AyuVis Research Inc, 1120 South Freeway, Fort Worth, TX, 76104, USA.,University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Syed M Ali
- Department of Biotechnology, Jamia Millia Islamia, New Delhi, 110025, India
| | - Mark E Pulse
- Preclinical Service, University of North Texas Health Science Center, Fort Worth, Texas, 76107, USA
| | - Joseph S Solomkin
- University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Steven M Opal
- The Warren Alpert Medical School, Brown University, Providence, RI, 02903, USA
| | - Vineet Bhandari
- Department of Pediatrics, Division of Neonatology, Drexel University School of Medicine, Philadelphia, PA, 19102, USA
| | - Suchismita Acharya
- AyuVis Research Inc, 1120 South Freeway, Fort Worth, TX, 76104, USA. .,Acceleration laboratory, University of North Texas Health Science Center, Fort Worth, Texas, 76107, USA.
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28
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Arora H, Wilcox SM, Johnson LA, Munro L, Eyford BA, Pfeifer CG, Welch I, Jefferies WA. The ATP-Binding Cassette Gene ABCF1 Functions as an E2 Ubiquitin-Conjugating Enzyme Controlling Macrophage Polarization to Dampen Lethal Septic Shock. Immunity 2019; 50:418-431.e6. [PMID: 30770245 DOI: 10.1016/j.immuni.2019.01.014] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2018] [Revised: 05/30/2018] [Accepted: 01/24/2019] [Indexed: 12/16/2022]
Abstract
Sepsis is a bi-phasic inflammatory disease that threatens approximately 30 million lives and claims over 14 million annually, yet little is known regarding the molecular switches and pathways that regulate this disease. Here, we have described ABCF1, an ATP-Binding Cassette (ABC) family member protein, which possesses an E2 ubiquitin enzyme activity, through which it controls the Lipopolysaccharide (LPS)- Toll-like Receptor-4 (TLR4) mediated gram-negative insult by targeting key proteins for K63-polyubiquitination. Ubiquitination by ABCF1 shifts the inflammatory profile from an early phase MyD88-dependent to a late phase TRIF-dependent signaling pathway, thereby regulating TLR4 endocytosis and modulating macrophage polarization from M1 to M2 phase. Physiologically, ABCF1 regulates the shift from the inflammatory phase of sepsis to the endotoxin tolerance phase, and modulates cytokine storm and interferon-β (IFN-β)-dependent production by the immunotherapeutic mediator, SIRT1. Consequently, ABCF1 controls sepsis induced mortality by repressing hypotension-induced renal circulatory dysfunction.
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Affiliation(s)
- Hitesh Arora
- Michael Smith Laboratories, University of British Columbia (UBC), 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada; The Vancouver Prostate Centre, 2660 Oak Street, Vancouver, BC V6H 3Z6, Canada; Department of Microbiology and Immunology, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada; Centre for Blood Research, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada; Djavad Mowafaghian Centre for Brain Health, 2215 Wesbrook Mall, Vancouver, BC V6T 2B5, Canada
| | - Sara Morgan Wilcox
- Michael Smith Laboratories, University of British Columbia (UBC), 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada; Department of Microbiology and Immunology, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada; Centre for Blood Research, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Laura Alexandra Johnson
- Michael Smith Laboratories, University of British Columbia (UBC), 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada; Centre for Blood Research, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada; Department of Zoology, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada
| | - Lonna Munro
- Michael Smith Laboratories, University of British Columbia (UBC), 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada; The Vancouver Prostate Centre, 2660 Oak Street, Vancouver, BC V6H 3Z6, Canada; Centre for Blood Research, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada; Djavad Mowafaghian Centre for Brain Health, 2215 Wesbrook Mall, Vancouver, BC V6T 2B5, Canada
| | - Brett Alexander Eyford
- Michael Smith Laboratories, University of British Columbia (UBC), 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada; Centre for Blood Research, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada; Djavad Mowafaghian Centre for Brain Health, 2215 Wesbrook Mall, Vancouver, BC V6T 2B5, Canada
| | - Cheryl Gurine Pfeifer
- Michael Smith Laboratories, University of British Columbia (UBC), 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada; The Vancouver Prostate Centre, 2660 Oak Street, Vancouver, BC V6H 3Z6, Canada; Centre for Blood Research, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada; Djavad Mowafaghian Centre for Brain Health, 2215 Wesbrook Mall, Vancouver, BC V6T 2B5, Canada
| | - Ian Welch
- Department of Pathology, UBC, 4145 Wesbrook Mall, Vancouver BC V6T 1W5, Canada
| | - Wilfred Arthur Jefferies
- Michael Smith Laboratories, University of British Columbia (UBC), 2185 East Mall, Vancouver, BC, V6T 1Z4, Canada; The Vancouver Prostate Centre, 2660 Oak Street, Vancouver, BC V6H 3Z6, Canada; Department of Microbiology and Immunology, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada; Centre for Blood Research, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada; Department of Zoology, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada; Department of Medical Genetics, UBC, 2350 Health Sciences Mall, Vancouver, BC, V6T 1Z3, Canada; Djavad Mowafaghian Centre for Brain Health, 2215 Wesbrook Mall, Vancouver, BC V6T 2B5, Canada.
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29
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NF-κB activation mediates LPS-or zymosan-induced hypotension and inflammation reversed by BAY61-3606, a selective Syk inhibitor, in rat models of septic and non-septic shock. Clin Exp Pharmacol Physiol 2019; 46:173-182. [DOI: 10.1111/1440-1681.13045] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 10/16/2018] [Accepted: 10/16/2018] [Indexed: 11/26/2022]
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30
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Ning Q. Main Complications of AECHB and Severe Hepatitis B (Liver Failure). ACUTE EXACERBATION OF CHRONIC HEPATITIS B 2019. [PMCID: PMC7498917 DOI: 10.1007/978-94-024-1603-9_2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Qin Ning
- Department of Infectious Disease, Tongji Hospital, Wuhan, China
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Wei S, Yang D, Yang J, Zhang X, Zhang J, Fu J, Zhou G, Liu H, Lian Z, Han H. Overexpression of Toll-like receptor 4 enhances LPS-induced inflammatory response and inhibits Salmonella Typhimurium growth in ovine macrophages. Eur J Cell Biol 2018; 98:36-50. [PMID: 30522781 DOI: 10.1016/j.ejcb.2018.11.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2018] [Revised: 11/06/2018] [Accepted: 11/28/2018] [Indexed: 12/15/2022] Open
Abstract
The Toll-like receptor 4 (TLR4) plays a crucial role in innate inflammatory responses, as it recognizes gram-negative bacteria (or their products) and contributes greatly to host defense against invading pathogens. Though TLR4 overexpressing transgenic sheep, resistant to certain diseases related with gram-negative bacteria, had been bred in our previous research, the effects of overexpression of TLR4 on innate immune response remained unclear. In this study, TLR4 overexpressing ovine macrophages were obtained from peripheral blood, and it was found that the overexpression of TLR4 initially promoted the production of proinflammatory cytokines TNFα and IL-6 by activating TLR4-mediated IRAK4-dependent NF-κB and MAPK (JNK and ERK1/2) signaling following LPS stimulation. However, this effect was later impaired due to increased internalization of TLR4 into endosomal compartment of the macrophages. Then the overexpression of TLR4 triggered TBK1-dependent interferon-regulatory factor-3 (IRF-3) expression, which in turn led to the induction of IFN-β and IFN-inducible genes (i.e.IP10, IRG1 and GARG16). Understandably, an increased IFN-β level facilitated phosphorylation of STAT1 to induce expression of innate antiviral genes Mx1 and ISG15, suggesting that TLR4 overexpressing macrophages were equipped better against viral infection. Correspondingly, the bacterial burden in these macrophages, after infection with live S. Typhimurium, was decreased significantly. In summary, the results indicated that overexpression of TLR4 could enhance innate inflammatory responses, initiate the innate antiviral immunity, and control effectively S. Typhimurium growth in ovine macrophages.
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Affiliation(s)
- Shao Wei
- Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China; National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Dongbing Yang
- Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China; National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Jifan Yang
- Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Xiaosheng Zhang
- Institute of Animal Science and Veterinary Medicine, Tianjin Academy of Agricultural Sciences, Tianjin, China
| | - Jinlong Zhang
- Institute of Animal Science and Veterinary Medicine, Tianjin Academy of Agricultural Sciences, Tianjin, China
| | - Juncai Fu
- State Key Laboratory of Animal Nutrition, China Agricultural University, Beijing, China
| | - Guangbin Zhou
- Farm Animal Genetic Resources Exploration and Innovation Key Laboratory of Sichuan Province, College of Animal Science and Technology, Sichuan Agricultural University, China
| | - Haijun Liu
- Institute of Animal Science and Veterinary Medicine, Tianjin Academy of Agricultural Sciences, Tianjin, China
| | - Zhengxing Lian
- Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China; National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Hongbing Han
- Beijing Key Laboratory for Animal Genetic Improvement, College of Animal Science and Technology, China Agricultural University, Beijing, China; National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China.
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Mai CW, Kang YB, Hamzah AS, Pichika MR. Comparative efficacy of vanilloids in inhibiting toll-like receptor-4 (TLR-4)/myeloid differentiation factor (MD-2) homodimerisation. Food Funct 2018; 9:3344-3350. [PMID: 29808897 DOI: 10.1039/c8fo00136g] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Vanilloid (4-hydroxy-3-methoxyphenyl benzenoid) containing foods are reported to possess many biological activities including anti-inflammatory properties. Homodimerisation of the Toll-like receptor-4 (TLR-4)/Myeloid differentiation factor 2 (MD-2) complex results in life-threatening complications in inflammatory disorders. In this study, we report activity of vanilloids in inhibition of TLR-4/MD-2 homodimersization and their molecular interactions with the receptor. The inhibitory activities of vanilloids were assessed in vitro by determining their antagonistic actions of lipopolysaccharide from Escherichia coli (LPSEc) in activation of TLR-4/MD-2 homodimerisation in TLR-4/MD-2/CD-14 transfected HEK-293 cells. The in vitro anti-inflammatory activity of vanilloids was also determined using RAW 264.7 cells. All the vanilloids were found to be active in the inhibition of TLR-4/MD-2 homodimersiation and nitric oxide production in RAW 264.7 cells. Rigid and flexible molecular docking studies were performed to gain insight into interactions between vanilloids and the binding site of the TLR-4/MD-2 complex.
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Affiliation(s)
- Chun-Wai Mai
- Department of Pharmaceutical Chemistry, School of Pharmacy, International Medical University (IMU), Bukit Jalil, 57000, Kuala Lumpur, Malaysia.
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Nath KA, Belcher JD, Nath MC, Grande JP, Croatt AJ, Ackerman AW, Katusic ZS, Vercellotti GM. Role of TLR4 signaling in the nephrotoxicity of heme and heme proteins. Am J Physiol Renal Physiol 2018; 314:F906-F914. [PMID: 28978536 PMCID: PMC6031913 DOI: 10.1152/ajprenal.00432.2017] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 09/29/2017] [Accepted: 10/01/2017] [Indexed: 12/23/2022] Open
Abstract
Destabilized heme proteins release heme, and free heme is toxic. Heme is now recognized as an agonist for the Toll-like receptor-4 (TLR4) receptor. This study examined whether the TLR4 receptor mediates the nephrotoxicity of heme, specifically, the effects of heme on renal blood flow and inflammatory responses. We blocked TLR4 signaling by the specific antagonist TAK-242. Intravenous administration of heme to mice promptly reduced renal blood flow, an effect attenuated by TAK-242. In vitro, TAK-242 reduced heme-elicited activation of NF-κB and its downstream gene monocyte chemoattractant protein-1(MCP-1); in contrast, TAK-242 failed to reduce heme-induced activation of the anti-inflammatory transcription factor Nrf2 and its downstream gene heme oxygenase-1 (HO-1). TAK-242 did not reduce heme-induced renal MCP-1 upregulation in vivo. TAK-242 did not reduce dysfunction and histological injury in the glycerol model of heme protein-induced acute kidney injury (AKI), findings corroborated by studies in TLR4+/+ and TLR4-/- mice. We conclude that 1) acute heme-mediated renal vasoconstriction occurs through TLR4 signaling; 2) proinflammatory effects of heme in renal epithelial cells involve TLR4 signaling, whereas the anti-inflammatory effects of heme do not; 3) TLR4 signaling does not mediate the proinflammatory effects of heme in the kidney; and 4) major mechanisms underlying glycerol-induced, heme protein-mediated AKI do not involve TLR4 signaling. These findings in the glycerol model are in stark contrast with findings in virtually all other AKI models studied to date and emphasize the importance of TLR4-independent pathways of heme protein-mediated injury in this model. Finally, these studies urge caution when using observations derived in vitro to predict what occurs in vivo.
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Affiliation(s)
- Karl A Nath
- Division of Nephrology and Hypertension, Mayo Clinic , Rochester, Minnesota
| | - John D Belcher
- Division of Hematology, Oncology and Transplantation, University of Minnesota , Minneapolis, Minnesota
| | - Meryl C Nath
- Department of Pathology, Mayo Clinic , Rochester, Minnesota
| | | | - Anthony J Croatt
- Division of Nephrology and Hypertension, Mayo Clinic , Rochester, Minnesota
| | - Allan W Ackerman
- Division of Nephrology and Hypertension, Mayo Clinic , Rochester, Minnesota
| | | | - Gregory M Vercellotti
- Division of Hematology, Oncology and Transplantation, University of Minnesota , Minneapolis, Minnesota
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Schwinté P, Mariotte A, Anand P, Keller L, Idoux-Gillet Y, Huck O, Fioretti F, Tenenbaum H, Georgel P, Wenzel W, Irusta S, Benkirane-Jessel N. Anti-inflammatory effect of active nanofibrous polymeric membrane bearing nanocontainers of atorvastatin complexes. Nanomedicine (Lond) 2017; 12:2651-2674. [DOI: 10.2217/nnm-2017-0198] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: We developed polymeric membranes for local administration of nonsoluble anti-inflammatory statin, as potential wound patch in rheumatic joint or periodontal lesions. Methods: Electrospun polycaprolactone membranes were fitted with polysaccharide-atorvastatin nanoreservoirs by using complexes with poly-aminocyclodextrin. Characterization methods are UV-Visible and X-ray photoelectron spectroscopy, molecular dynamics, scanning and transmission electron microscopy. In vitro, membranes were seeded with macrophages, and inflammatory cytokine expression were monitored. Results & conclusion: Stable inclusion complexes were formed in solution (1:1 stability constant 368 M- 1, -117.40 kJ mol- 1), with supramolecular globular organization (100 nm, substructure 30 nm). Nanoreservoir technology leads to homogeneous distribution of atorvastatin calcium trihydrate complexes in the membrane. Quantity embedded was estimated (70–90 μg in 30 μm × 6 mm membrane). Anti-inflammatory effect by cell contact-dependent release reached 60% inhibition for TNF-α and 80% for IL-6. The novelty resides in the double protection offered by the cyclodextrins as drug molecular chaperones, with further embedding into biodegradable nanoreservoirs. The strategy is versatile and can target other diseases.
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Affiliation(s)
- Pascale Schwinté
- INSERM (French National Institute of Health & Medical Research), UMR 1109, “Osteoarticular & Dental Regenerative Nanomedicine”, Faculté de Médecine, 11 rue Humann, FMTS, Strasbourg, F-67085, France
| | - Alexandre Mariotte
- INSERM UMR 1109, Molecular ImmunoRheumatology, LabEx TRANSPLANTEX, Faculté de Médecine, Center de Recherche d'Immunologie et d'Hématologie, 4 rue Kirschleger, FMTS, Université de Strasbourg, Strasbourg, F-67085, France
| | - Priya Anand
- Institute of Nanotechnology, Karlsruhe Institute of Technology, KIT Campus North, Hermann-von-Helmholtz-Platz 1, Building 640, Eggenstein-Leopoldshafen, D-76344, Germany
| | - Laetitia Keller
- INSERM (French National Institute of Health & Medical Research), UMR 1109, “Osteoarticular & Dental Regenerative Nanomedicine”, Faculté de Médecine, 11 rue Humann, FMTS, Strasbourg, F-67085, France
| | - Ysia Idoux-Gillet
- INSERM (French National Institute of Health & Medical Research), UMR 1109, “Osteoarticular & Dental Regenerative Nanomedicine”, Faculté de Médecine, 11 rue Humann, FMTS, Strasbourg, F-67085, France
| | - Olivier Huck
- INSERM (French National Institute of Health & Medical Research), UMR 1109, “Osteoarticular & Dental Regenerative Nanomedicine”, Faculté de Médecine, 11 rue Humann, FMTS, Strasbourg, F-67085, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, 1 place de l'Hôpital, Strasbourg F-67085, France
| | - Florence Fioretti
- INSERM (French National Institute of Health & Medical Research), UMR 1109, “Osteoarticular & Dental Regenerative Nanomedicine”, Faculté de Médecine, 11 rue Humann, FMTS, Strasbourg, F-67085, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, 1 place de l'Hôpital, Strasbourg F-67085, France
| | - Henri Tenenbaum
- Faculté de Chirurgie Dentaire, Université de Strasbourg, 1 place de l'Hôpital, Strasbourg F-67085, France
| | - Philippe Georgel
- INSERM UMR 1109, Molecular ImmunoRheumatology, LabEx TRANSPLANTEX, Faculté de Médecine, Center de Recherche d'Immunologie et d'Hématologie, 4 rue Kirschleger, FMTS, Université de Strasbourg, Strasbourg, F-67085, France
| | - Wolfgang Wenzel
- Institute of Nanotechnology, Karlsruhe Institute of Technology, KIT Campus North, Hermann-von-Helmholtz-Platz 1, Building 640, Eggenstein-Leopoldshafen, D-76344, Germany
| | - Silvia Irusta
- Department of Chemical Engineering & Aragon Nanoscience Institute, University of Zaragoza, C/Mariano Esquillor, s/n, Zaragoza, 50018, Spain
| | - Nadia Benkirane-Jessel
- INSERM (French National Institute of Health & Medical Research), UMR 1109, “Osteoarticular & Dental Regenerative Nanomedicine”, Faculté de Médecine, 11 rue Humann, FMTS, Strasbourg, F-67085, France
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Ko HHT, Lareu RR, Dix BR, Hughes JD. Statins: antimicrobial resistance breakers or makers? PeerJ 2017; 5:e3952. [PMID: 29085751 PMCID: PMC5659212 DOI: 10.7717/peerj.3952] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Accepted: 10/02/2017] [Indexed: 12/14/2022] Open
Abstract
Introduction The repurposing of non-antibiotic drugs as adjuvant antibiotics may help break antimicrobial resistance (AMR). Statins are commonly prescribed worldwide to lower cholesterol. They also possess qualities of AMR “breakers”, namely direct antibacterial activity, synergism with antibiotics, and ability to stimulate the host immune system. However, statins’ role as AMR breakers may be limited. Their current extensive use for cardiovascular protection might result in selective pressures for resistance, ironically causing statins to be AMR “makers” instead. This review examines statins’ potential as AMR breakers, probable AMR makers, and identifies knowledge gaps in a statin-bacteria-human-environment continuum. The most suitable statin for repurposing is identified, and a mechanism of antibacterial action is postulated based on structure-activity relationship analysis. Methods A literature search using keywords “statin” or “statins” combined with “minimum inhibitory concentration” (MIC) was performed in six databases on 7th April 2017. After screening 793 abstracts, 16 relevant studies were identified. Unrelated studies on drug interactions; antifungal or antiviral properties of statins; and antibacterial properties of mevastatin, cerivastatin, antibiotics, or natural products were excluded. Studies involving only statins currently registered for human use were included. Results Against Gram-positive bacteria, simvastatin generally exerted the greatest antibacterial activity (lowest MIC) compared to atorvastatin, rosuvastatin, and fluvastatin. Against Gram-negative bacteria, atorvastatin generally exhibited similar or slightly better activity compared to simvastatin, but both were more potent than rosuvastatin and fluvastatin. Discussion Statins may serve as AMR breakers by working synergistically with existing topical antibiotics, attenuating virulence factors, boosting human immunity, or aiding in wound healing. It is probable that statins’ mechanism of antibacterial activity involves interference of bacterial cell regulatory functions via binding and disrupting cell surface structures such as wall teichoic acids, lipoteichoic acids, lipopolysaccharides, and/or surface proteins. The widespread use of statins for cardiovascular protection may favor selective pressures or co-selection for resistance, including dysbiosis of the human gut microbiota, sublethal plasma concentrations in bacteremic patients, and statin persistence in the environment, all possibly culminating in AMR. Conclusion Simvastatin appears to be the most suitable statin for repurposing as a novel adjuvant antibiotic. Current evidence better supports statins as potential AMR breakers, but their role as plausible AMR makers cannot be excluded. Elucidating the mechanism of statins’ antibacterial activity is perhaps the most important knowledge gap to address as this will likely clarify statins’ role as AMR breakers or makers.
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Affiliation(s)
- Humphrey H T Ko
- School of Pharmacy, Faculty of Health Sciences, Curtin University, Perth, Western Australia, Australia.,Curtin Health Innovation Research Institute (CHIRI) Biosciences Research Precinct, Curtin University, Perth, Western Australia, Australia
| | - Ricky R Lareu
- School of Pharmacy, Faculty of Health Sciences, Curtin University, Perth, Western Australia, Australia.,Curtin Health Innovation Research Institute (CHIRI) Biosciences Research Precinct, Curtin University, Perth, Western Australia, Australia
| | - Brett R Dix
- School of Pharmacy, Faculty of Health Sciences, Curtin University, Perth, Western Australia, Australia
| | - Jeffery D Hughes
- School of Pharmacy, Faculty of Health Sciences, Curtin University, Perth, Western Australia, Australia
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TLR4 Signaling Pathway Modulators as Potential Therapeutics in Inflammation and Sepsis. Vaccines (Basel) 2017; 5:vaccines5040034. [PMID: 28976923 PMCID: PMC5748601 DOI: 10.3390/vaccines5040034] [Citation(s) in RCA: 356] [Impact Index Per Article: 50.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 09/29/2017] [Accepted: 10/01/2017] [Indexed: 02/06/2023] Open
Abstract
Toll-Like Receptor 4 (TLR4) signal pathway plays an important role in initiating the innate immune response and its activation by bacterial endotoxin is responsible for chronic and acute inflammatory disorders that are becoming more and more frequent in developed countries. Modulation of the TLR4 pathway is a potential strategy to specifically target these pathologies. Among the diseases caused by TLR4 abnormal activation by bacterial endotoxin, sepsis is the most dangerous one because it is a life-threatening acute system inflammatory condition that still lacks specific pharmacological treatment. Here, we review molecules at a preclinical or clinical phase of development, that are active in inhibiting the TLR4-MyD88 and TLR4-TRIF pathways in animal models. These are low-molecular weight compounds of natural and synthetic origin that can be considered leads for drug development. The results of in vivo studies in the sepsis model and the mechanisms of action of drug leads are presented and critically discussed, evidencing the differences in treatment results from rodents to humans.
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Fang Q, Wang J, Zhang Y, Wang L, Li W, Han J, Huang W, Liang G, Wang Y. Inhibition of myeloid differentiation factor-2 attenuates obesity-induced cardiomyopathy and fibrosis. Biochim Biophys Acta Mol Basis Dis 2017; 1864:252-262. [PMID: 28965884 DOI: 10.1016/j.bbadis.2017.09.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2017] [Revised: 09/21/2017] [Accepted: 09/27/2017] [Indexed: 02/06/2023]
Abstract
Obesity causes cardiovascular diseases, including cardiac hypertrophy and remodeling, via chronic tissue inflammation. Myeloid differentiation factor-2 (MD2), a binding protein of lipopolysaccharide, is functionally essential for the activation of proinflammatory pathways in endotoxin-induced acute inflammatory diseases. Here we tested the hypothesis that MD2 plays a central role in obesity-induced cardiomyopathy. Wildtype or MD2 knockout mice were fed with a high fat diet (HFD) or normal diet (Control) for total 16weeks, and MD2 inhibitor L6H21 (20mg/kg) or vehicle (1% CMC-Na) were administered from the beginning of the 9th week. HFD induced significant weight gain and cardiac hypertrophy, with increased cardiac fibrosis and inflammation. L6H21 administration or MD2 knockout attenuated HFD-induced obesity, inflammation and cardiac remodeling. In vitro exposure of H9C2 cells to high lipids induced cell hypertrophy with activated JNK/ERK and NF-κB pathways, which was abolished by pretreatment of MD2 inhibitor L6H21. Our results demonstrate that MD2 is essential to obesity-related cardiac hypertrophy through activating JNK/ERK and NF-κB-dependent cardiac inflammatory pathways. Targeting MD2 would be a therapeutic approach to prevent obesity-induced cardiac injury and remodeling.
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Affiliation(s)
- Qilu Fang
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Jingying Wang
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Yali Zhang
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Lintao Wang
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Weixin Li
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Jibo Han
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China; Department of Cardiology, the First Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Weijian Huang
- Department of Cardiology, the First Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Guang Liang
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China.
| | - Yi Wang
- Chemical Biology Research Center, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China.
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Shi X, Li M, Huang K, Zhou S, Hu Y, Pan S, Gu Y. HMGB1 binding heptamer peptide improves survival and ameliorates brain injury in rats after cardiac arrest and cardiopulmonary resuscitation. Neuroscience 2017; 360:128-138. [PMID: 28778700 DOI: 10.1016/j.neuroscience.2017.07.052] [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: 04/01/2017] [Revised: 07/18/2017] [Accepted: 07/20/2017] [Indexed: 01/09/2023]
Abstract
Excessive inflammatory response produced after cardiac arrest and cardiopulmonary resuscitation (CA/CPR) is one of major causes of cerebral injury. High mobility group box 1 (HMGB1) is a pro-inflammatory cytokine and its role in brain injury after CA/CPR is unclear. Herein we investigated whether blocking HMGB1 signaling could ease brain injury after CA/CPR. Male Sprague-Dawley rats (n=181) were subjected to 8-min Asphyxia CA model or Sham operation. The ELISA data revealed both resuscitated patients and animals had elevated HMGB1 level in sera, compared with the healthy volunteers or Sham operative rats, respectively (P<0.01). Rats successfully resuscitated from CA were then randomly treated with either membrane permeable (TAT-fused) HMGB1 binding heptamer peptide (HBHP) or Scramble peptide. Results showed that HBHP treatment markedly improved 7-day survival rate, reduced neurological deficit scores, and prevented neuronal and dendrite loss in hippocampal CA1 region. Moreover, HBHP inhibited the activation of microglia and astrocytes and downregulated the mRNA and protein expressions of proinflammatory factors. We finally blocked toll-like receptor-4 (TLR4, one of HMGB1 receptors) with a specific antagonist TAK-242 before CA induction to confirm the detrimental effect of HMGB1 signaling and found blocking TLR4 could also attenuate the neuronal degeneration, as well as reduce NF-κB-mediated inflammatory signaling. Our findings indicate that CA/CPR can induce HMGB1 release to serum, while blocking HMGB1 signaling with peptide may improve the survival and attenuate post-resuscitation brain injury in the rat model of CA/CPR. TLR4 antagonist may also offer neuroprotective effects through weakening HMGB1-mediated proinflammatory reactions.
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Affiliation(s)
- Xue Shi
- Department of Neurology, Nanfang Hospital, Southern Medical University Guangzhou, Guangdong 510515, China
| | - Miaodan Li
- Department of Neurology, Nanfang Hospital, Southern Medical University Guangzhou, Guangdong 510515, China
| | - Kaibin Huang
- Department of Neurology, Nanfang Hospital, Southern Medical University Guangzhou, Guangdong 510515, China
| | - Shiming Zhou
- Department of Neurology, Nanfang Hospital, Southern Medical University Guangzhou, Guangdong 510515, China
| | - Yafang Hu
- Department of Neurology, Nanfang Hospital, Southern Medical University Guangzhou, Guangdong 510515, China
| | - Suyue Pan
- Department of Neurology, Nanfang Hospital, Southern Medical University Guangzhou, Guangdong 510515, China.
| | - Yong Gu
- Department of Neurology, Nanfang Hospital, Southern Medical University Guangzhou, Guangdong 510515, China.
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Ramos-Benítez MJ, Ruiz-Jiménez C, Aguayo V, Espino AM. Recombinant Fasciola hepatica fatty acid binding protein suppresses toll-like receptor stimulation in response to multiple bacterial ligands. Sci Rep 2017; 7:5455. [PMID: 28710478 PMCID: PMC5511235 DOI: 10.1038/s41598-017-05735-w] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2017] [Accepted: 06/02/2017] [Indexed: 01/07/2023] Open
Abstract
Recently, we reported that a native Fasciola hepatica fatty acid binding protein (FABP) termed Fh12 is a powerful anti-inflammatory protein capable of suppressing the LPS-induced expression of inflammatory markers in vivo and in vitro. Because the purification of a protein in native form is, in many situations not cost-beneficial and unsuitable for industrial grade scale-up, this study accomplished the task of optimizing the expression and purification of a recombinant form of FABP (Fh15). Additionally, we ascertained whether this molecule could exhibit a similar suppressive effect on TLR-stimulation and inflammatory cytokine expression from macrophages than those previously demonstrated for the native molecule. Results demonstrated that Fh15 suppresses the expression of IL-1β and TNFα in murine macrophages and THP1 Blue CD14 cells. Additionally, Fh15 suppress the LPS-induced TLR4 stimulation. This effect was not impaired by a thermal denaturing process or blocked by the presence of anti-Fh12 antibodies. Fh15 also suppressed the stimulation of various TLRs in response to whole bacteria extracts, suggesting that Fh15 could have a broad spectrum of action. These results support the possibility of using Fh15 as an excellent alternative for an anti-inflammatory drug in preclinical studies in the near future.
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Affiliation(s)
- Marcos J Ramos-Benítez
- University of Puerto Rico, Medical Sciences Campus, Department of Microbiology, PO BOX 365067, San Juan, Puerto Rico, 00936, USA
| | - Caleb Ruiz-Jiménez
- University of Puerto Rico, Medical Sciences Campus, Department of Microbiology, PO BOX 365067, San Juan, Puerto Rico, 00936, USA
| | - Vasti Aguayo
- University of Puerto Rico, Medical Sciences Campus, Department of Microbiology, PO BOX 365067, San Juan, Puerto Rico, 00936, USA
| | - Ana M Espino
- University of Puerto Rico, Medical Sciences Campus, Department of Microbiology, PO BOX 365067, San Juan, Puerto Rico, 00936, USA.
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Hoshino K, Kitamura T, Nakamura Y, Irie Y, Matsumoto N, Kawano Y, Ishikura H. Usefulness of plasminogen activator inhibitor-1 as a predictive marker of mortality in sepsis. J Intensive Care 2017; 5:42. [PMID: 28702197 PMCID: PMC5504563 DOI: 10.1186/s40560-017-0238-8] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 07/02/2017] [Indexed: 01/30/2023] Open
Abstract
Background Sepsis is one of the most significant causes of mortality in intensive care units. It indicates crosstalk between inflammation and coagulation. In this study, we aimed to identify prognostic markers among sepsis biomarkers and coagulation/fibrinolysis markers. Methods Patients with sepsis according to the Sepsis-3 criteria were enrolled from January 2013 to September 2015. Univariate and multivariate logistic regression analyses were performed to identify an independent predictive marker of 28-day mortality among sepsis biomarkers and coagulation/fibrinolysis markers on ICU admission. Receiver operating characteristic analysis was performed; the optimal cutoff value of 28-day mortality was calculated using the predictive marker. Patients were classified into two groups according to the cutoff level of the predictive marker. Patient characteristics were compared between the groups. Results A total of 186 patients were enrolled in this study; the 28-day mortality was 19.4% (36/186). PAI-1 was identified as the only independent predictive marker of 28-day mortality by univariate and multivariate logistic regression. The area under the curve was 0.72; the optimal cutoff level was 83 ng/ml (sensitivity, 75%; specificity, 61%). Patients were classified into a higher group (PAI-1 level ≥83 ng/ml; n = 85) and a lower group (PAI-1 level <83 ng/ml; n = 101). All disseminated intravascular coagulation (DIC) scores and Sequential Organ Failure Assessment score were significantly higher in the higher group than in the lower group. Conclusions PAI-1 can predict prognosis in sepsis patients. PAI-1 reflects DIC with suppressed fibrinolysis and organ failure, with microthrombi leading to microcirculatory dysfunction.
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Affiliation(s)
- Kota Hoshino
- Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180 Japan
| | - Taisuke Kitamura
- Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180 Japan
| | - Yoshihiko Nakamura
- Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180 Japan
| | - Yuhei Irie
- Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180 Japan
| | - Norihiko Matsumoto
- Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180 Japan
| | - Yasumasa Kawano
- Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180 Japan
| | - Hiroyasu Ishikura
- Department of Emergency and Critical Care Medicine, Faculty of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180 Japan
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Lee SC, Wang SY, Li CC, Liu CT. Anti-inflammatory effect of cinnamaldehyde and linalool from the leaf essential oil of Cinnamomum osmophloeum Kanehira in endotoxin-induced mice. J Food Drug Anal 2017; 26:211-220. [PMID: 29389558 PMCID: PMC9332676 DOI: 10.1016/j.jfda.2017.03.006] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2017] [Revised: 03/16/2017] [Accepted: 03/17/2017] [Indexed: 12/22/2022] Open
Abstract
Cinnamomum osmophloeum Kanehira is a Taiwan native plant that belongs to genus Cinnamomum and is also known as pseudocinnamomum or indigenous cinnamon. Its leaf is traditionally used by local people in cooking and as folk therapy. We previously demonstrated the chemical composition and anti-inflammatory effect of leaf essential oil of Cinnamomum osmophloeum Kanehira of linalool chemotype in streptozotocin-induced diabetic rats and on endotoxin-injected mice. The aim of the present study is to evaluate whether cinnamaldehyde and linalool the active anti-inflammatory compounds in leaf essential oil of Cinnamomum osmophloeum Kanehira. Before the injection of endotoxin, C57BL/6 mice of the experimental groups were administered cinnamaldehyde (0.45 or 0.9 mg/kg body weight) or linalool (2.6 or 5.2 mg/kg body weight), mice of the positive control group were administered the leaf essential oil (13 mg/kg body weight), and mice of the negative group were administered vehicle (corn oil, 4 mL/kg body weight) by gavage every other day for two weeks. All mice received endotoxin (i.p. 10 mg/mL/kg body weight) the next day after the final administration and were killed 12 h after the injection. Normal control mice were pretreated with vehicle followed by the injection with saline. None of the treatment found to affect body weight or food or water intake of mice before the injection of endotoxin. Cinnamaldehyde and linalool were found significantly reversed endotoxin-induced body weight loss and lymphoid organ enlargement compared with vehicle (P < 0.05). Both compounds also significantly lowered endotoxin-induced levels of peripheral nitrate/nitrite, interleukin (IL)-1β, IL-18, tumor necrosis factor (TNF)-α, interferon (IFN)-γ, and High-mobility group box 1 protein (HMGB-1), and levels of nitrate/nitrite, IL-1β, TNF-α, and IFN-γ in spleen and mesenteric lymph nodes (MLNs) (P < 0.05). Endotoxin-induced expression of toll-like receptor 4 (TLR4), Myeloid differentiation primary response gene 88 (MyD88), myeloid differentiation protein 2 (MD2), Nod-like receptor family, pyrin domain containing 3 (NLRP3), apoptosis-associated speck-like protein containing a caspase-recruitment domain (ASC), and caspase-1 in spleen and mesenteric lymph nodes (MLNs) were inhibited by all tested doses of cinnamaldehyde and linalool (P < 0.05). Subsequently, the activation of nuclear factor (NF)-κB and the activity of caspase-1 in spleen and MLNs were also suppressed by these two compounds (P < 0.05). In addition, cinnamaldehyde and linalool at the dose equivalent to their corresponding content in the tested dose of the leaf essential oil, which was 0.9 mg/kg and 5.2 mg/kg, respectively, showed similar or slightly less inhibitory activity for most of these inflammatory parameters compared with that of the leaf essential oil. Our data confirmed the potential use of leaf essential oil of Cinnamomum osmophloeum Kanehira as an anti-inflammatory natural product and provide evidence for cinnamaldehyde and linalool as two potent agents for prophylactic use in health problems associated with inflammations that being attributed to over-activated TLR4 and/or NLRP3 signaling pathways.
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Affiliation(s)
- Shih-Chieh Lee
- Department of BioIndustry Technology, Da-Yeh University, No. 168, University Rd., Dacun, Changhua, Taiwan, Republic of China
| | - Shih-Yun Wang
- School of Nutrition, Chung Shan Medical University, No. 110, Sec. 1, Chien Kuo N. Rd., Taichung, Taiwan, Republic of China
| | - Chien-Chun Li
- School of Nutrition, Chung Shan Medical University, No. 110, Sec. 1, Chien Kuo N. Rd., Taichung, Taiwan, Republic of China
| | - Cheng-Tzu Liu
- School of Nutrition, Chung Shan Medical University, No. 110, Sec. 1, Chien Kuo N. Rd., Taichung, Taiwan, Republic of China; Department of Nutrition, Chung Shan Medical University Hospital, No. 110, Sec. 1, Chien Kuo N. Rd., Taichung, Taiwan, Republic of China.
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LOX-1 and TLR4 affect each other and regulate the generation of ROS in A. fumigatus keratitis. Int Immunopharmacol 2016; 40:392-399. [PMID: 27694040 DOI: 10.1016/j.intimp.2016.09.027] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2016] [Revised: 08/29/2016] [Accepted: 09/27/2016] [Indexed: 11/24/2022]
Abstract
PURPOSE To explore the relationship between LOX-1 and TLR4 in Aspergillus fumigatus (A. fumigatus) keratitis. To determine LOX-1 and TLR4 can affect each other and regulate inflammation through regulation of the generation of reactive oxygen species (ROS) in A. fumigatus keratitis. METHODS The cornea and abdominal cavity extracted neutrophils of susceptible C57BL/6 mice were infected with A. fumigatus. The cornea and neutrophils were pretreated with LOX-1 neutralizing antibody, Polyinosinic acid (Poly(I)) (the inhibitor of LOX-1) or CLI-095 (the inhibitor of TLR4) separately before infection. LOX-1, TLR4 and IL-1β expression were detected in normal and infected cornea by PCR and Western Blot, while ROS was detected in the neutrophils by flow cytometry. RESULTS LOX-1, TLR4, IL-1β mRNA and protein levels were up-regulated in C57BL/6 cornea after infection. LOX-1 neutralizing antibody or Poly(I) pretreatment decreased the expression of LOX-1, TLR4 and IL-1β in C57BL/6 cornea after infection and CLI-095 pretreatment decreased the expression of LOX-1, TLR4 and IL-1β in C57BL/6 cornea after infection. ROS generation was increased in C57BL/6 neutrophils after infection, however, ROS generation was decreased in C57BL/6 neutrophils after infection by LOX-1 neutralizing antibody or Poly(I) or CLI-095 pretreatment. CONCLUSION LOX-1, TLR4 and IL-1β expression and ROS generation are increased after infection. LOX-1 and TLR4 can affect each other and regulate the generation of ROS in A. fumigatus keratitis. Inhibition of LOX-1 and TLR4 can reduce ROS generation.
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Woller SA, Ravula SB, Tucci FC, Beaton G, Corr M, Isseroff RR, Soulika AM, Chigbrow M, Eddinger KA, Yaksh TL. Systemic TAK-242 prevents intrathecal LPS evoked hyperalgesia in male, but not female mice and prevents delayed allodynia following intraplantar formalin in both male and female mice: The role of TLR4 in the evolution of a persistent pain state. Brain Behav Immun 2016; 56:271-80. [PMID: 27044335 PMCID: PMC4917460 DOI: 10.1016/j.bbi.2016.03.026] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2015] [Revised: 03/22/2016] [Accepted: 03/31/2016] [Indexed: 01/08/2023] Open
Abstract
OBJECTIVE Pain resulting from local tissue injury or inflammation typically resolves with time. Frequently, however, this pain may unexpectedly persist, becoming a pathological chronic state. Increasingly, the innate and adaptive immune systems are being implicated in the initiation and maintenance of these persistent conditions. In particular, Toll-like receptor 4 (TLR4) signaling has been shown to mediate the transition to a persistent pain state in a sex-dependent manner. In the present work, we explored this contribution using the TLR4 antagonist, TAK-242. METHODS Male and female C57Bl/6 mice were given intravenous (IV), intrathecal (IT), or intraperitoneal (IP) TAK-242 prior to IT delivery of lipopolysaccharide (LPS), and tactile reactivity was assessed at regular intervals over 72-h. Additional groups of mice were treated with IP TAK-242 prior to intraplantar formalin, and flinching was monitored for 1-h. Tactile reactivity was assessed at 7-days after formalin delivery. RESULTS LPS evoked TNF release from male and female macrophages and RAW267.4 cells, which was blocked in a concentration dependent fashion by TAK-242. In vivo, IT LPS evoked tactile allodynia to a greater degree in male than female mice. TAK-242, given by all routes, prevented development of IT LPS-induced tactile allodynia in male animals, but did not reverse their established allodynia. TLR4 deficiency and TAK-242 treatment attenuated IT LPS-induced allodynia in male, but not female mice. In the formalin model, pre-treatment with TAK-242 did not affect Phase 1 or Phase 2 flinching, but prevented the delayed tactile allodynia in both male and unexpectedly in female mice (Phase 3). CONCLUSIONS Together, these results suggest that TAK-242 is a TLR4 antagonist that has efficacy after systemic and intrathecal delivery and confirms the role of endogenous TLR4 signaling in triggering the development of a delayed allodynia in both male and female mice.
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Affiliation(s)
- Sarah A Woller
- Department of Anesthesiology, University of California San Diego, La Jolla, CA, USA; Department of Medicine, Division of Rheumatology, Allergy, and Immunology, University of California San Diego, La Jolla, CA, USA.
| | - Satheesh B Ravula
- Epigen Biosciences Inc., 10225 Barnes Canyon Road, Suite A104, San Diego, CA 92121, USA.
| | - Fabio C Tucci
- Epigen Biosciences Inc., 10225 Barnes Canyon Road, Suite A104, San Diego, CA 92121, USA.
| | - Graham Beaton
- Epigen Biosciences Inc., 10225 Barnes Canyon Road, Suite A104, San Diego, CA 92121, USA.
| | - Maripat Corr
- Department of Medicine, Division of Rheumatology, Allergy, and Immunology, University of California San Diego, La Jolla, CA, USA.
| | - R Rivkah Isseroff
- Department of Dermatology, School of Medicine, University of California, Davis, CA, USA.
| | - Athena M Soulika
- Department of Dermatology, School of Medicine, University of California, Davis, CA, USA; Shriners Hospital for Children, Northern California, Sacramento, CA, USA.
| | - Marianne Chigbrow
- Department of Dermatology, School of Medicine, University of California, Davis, CA, USA.
| | - Kelly A Eddinger
- Department of Anesthesiology, University of California San Diego, La Jolla, CA, USA.
| | - Tony L Yaksh
- Department of Anesthesiology, University of California San Diego, La Jolla, CA, USA.
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Effect of Toll-Like Receptor 4 on Synovial Injury of Temporomandibular Joint in Rats Caused by Occlusal Interference. Mediators Inflamm 2016; 2016:7694921. [PMID: 27413256 PMCID: PMC4931072 DOI: 10.1155/2016/7694921] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2016] [Revised: 05/09/2016] [Accepted: 05/25/2016] [Indexed: 12/15/2022] Open
Abstract
Synovitis is an important disease that causes intractable pain in TMJ. Some investigations suggested that the increasing expression of IL-1β secreted by synovial lining cells plays an important role in synovial inflammation and cartilage destruction in TMJ. In our previous research, the results demonstrated that TLR4 is involved in the expression of IL-1β in SFs from TMJ with lipopolysaccharide stimulation. However, the inflammatory response that occurred in synovial membrane is not caused by bacterial infection. In the current study, we investigated whether or not TLR4 participates in the inflammatory responses and the expression of IL-1β in synovial membrane of rats induced by occlusal interference. The results showed that obvious inflammation changes were observed in the synovial membranes and the expression of TLR4 and IL-1β was increased at both mRNA and protein levels in the occlusal interference rats. In addition, the inflammation reactions and the increased expression of IL-1β could be restrained by treatment with TAK-242, a blocker of TLR4 signaling. The results prompted us that the activation of TLR4 may be involved in the inflammatory reactions and increased expression of IL-1β in patients with synovitis and participate in the mechanisms of the initiation and development of synovial injury by regulating the expression of inflammatory mediators like IL-1β in synovial membranes.
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Haji-Ghassemi O, Müller-Loennies S, Rodriguez T, Brade L, Grimmecke HD, Brade H, Evans SV. The Combining Sites of Anti-lipid A Antibodies Reveal a Widely Utilized Motif Specific for Negatively Charged Groups. J Biol Chem 2016; 291:10104-18. [PMID: 26933033 DOI: 10.1074/jbc.m115.712448] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Indexed: 01/29/2023] Open
Abstract
Lipopolysaccharide dispersed in the blood by Gram-negative bacteria can be a potent inducer of septic shock. One research focus has been based on antibody sequestration of lipid A (the endotoxic principle of LPS); however, none have been successfully developed into a clinical treatment. Comparison of a panel of anti-lipid A antibodies reveals highly specific antibodies produced through distinct germ line precursors. The structures of antigen-binding fragments for two homologous mAbs specific for lipid A, S55-3 and S55-5, have been determined both in complex with lipid A disaccharide backbone and unliganded. These high resolution structures reveal a conserved positively charged pocket formed within the complementarity determining region H2 loops that binds the terminal phosphates of lipid A. Significantly, this motif occurs in unrelated antibodies where it mediates binding to negatively charged moieties through a range of epitopes, including phosphorylated peptides used in diagnostics and therapeutics. S55-3 and S55-5 have combining sites distinct from anti-lipid A antibodies previously described (as a result of their separate germ line origin), which are nevertheless complementary both in shape and charge to the antigen. S55-3 and S55-5 display similar avidity toward lipid A despite possessing a number of different amino acid residues in their combining sites. Binding of lipid A occurs independent of the acyl chains, although the GlcN-O6 attachment point for the core oligosaccharide is buried in the combining site, which explains their inability to recognize LPS. Despite their lack of therapeutic potential, the observed motif may have significant immunological implications as a tool for engineering recombinant antibodies.
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Affiliation(s)
- Omid Haji-Ghassemi
- From the Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia V8P 3P6, Canada and
| | - Sven Müller-Loennies
- the Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Parkallee 22, Borstel D-23845, Germany
| | - Teresa Rodriguez
- From the Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia V8P 3P6, Canada and
| | - Lore Brade
- the Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Parkallee 22, Borstel D-23845, Germany
| | - Hans-Dieter Grimmecke
- the Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Parkallee 22, Borstel D-23845, Germany
| | - Helmut Brade
- the Research Center Borstel, Leibniz-Center for Medicine and Biosciences, Parkallee 22, Borstel D-23845, Germany
| | - Stephen V Evans
- From the Department of Biochemistry and Microbiology, University of Victoria, Victoria, British Columbia V8P 3P6, Canada and
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Lee YS, Park JS, Jung SM, Kim SD, Kim JH, Lee JY, Jung KC, Mamura M, Lee S, Kim SJ, Bae YS, Park SH. Inhibition of lethal inflammatory responses through the targeting of membrane-associated Toll-like receptor 4 signaling complexes with a Smad6-derived peptide. EMBO Mol Med 2016; 7:577-92. [PMID: 25766838 PMCID: PMC4492818 DOI: 10.15252/emmm.201404653] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
We have previously reported that Smad6, one of the inhibitory Smads of transforming growth factor-β (TGF-β)/bone morphogenetic protein (BMP) signaling, inhibits Toll-like receptor (TLR) 4 signaling by disrupting the Pellino-1-mediated TLR4 signaling complex. Here, we developed Smaducin-6, a novel membrane-tethered palmitic acid-conjugated Smad6-derived peptide composed of amino acids 422–441 of Smad6. Smaducin-6 interacted with Pellino-1, located in the inner membrane, thereby disrupting the formation of IRAK1-, RIP1-, IKKε-mediated TLR4 signaling complexes. Systemic administration of Smaducin-6 showed a significant therapeutic effect on mouse TLR4-mediated inflammatory disease models, cecal-ligation–puncture (CLP)-induced sepsis, and lipopolysaccharide-induced endotoxemia, by inhibiting pro-inflammatory cytokine production and apoptosis while enhancing neutrophil migration and bacterial clearance. Our findings provide clues to develop new peptide-based drugs to target Pellino-1 protein in TLR4 signaling pathway for the treatment of sepsis.
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Affiliation(s)
- Youn Sook Lee
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Korea
| | - Jin Seok Park
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Korea
| | - Su Myung Jung
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Korea
| | - Sang-Doo Kim
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Korea
| | - Jun Hwan Kim
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Korea
| | - Jae Young Lee
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Korea
| | - Kyeong Cheon Jung
- Department of Pathology, College of Medicine, Seoul National University, Seoul, Korea
| | - Mizuko Mamura
- Department of Molecular Pathology, Tokyo Medical University, Tokyo, Japan Department of Internal Medicine, Kyungpook National University School of Medicine, Daegu, Korea
| | - Sangho Lee
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Korea
| | | | - Yoe-Sik Bae
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Korea Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Korea
| | - Seok Hee Park
- Department of Biological Sciences, Sungkyunkwan University, Suwon, Korea Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Korea
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Hu Z, Murakami T, Suzuki K, Tamura H, Reich J, Kuwahara-Arai K, Iba T, Nagaoka I. Antimicrobial cathelicidin peptide LL-37 inhibits the pyroptosis of macrophages and improves the survival of polybacterial septic mice. Int Immunol 2016; 28:245-53. [PMID: 26746575 DOI: 10.1093/intimm/dxv113] [Citation(s) in RCA: 50] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 12/24/2015] [Indexed: 01/21/2023] Open
Abstract
LL-37 is the only known member of the cathelicidin family of antimicrobial peptides in humans. In addition to its broad spectrum of antimicrobial activities, LL-37 can modulate various inflammatory reactions. We previously revealed that LL-37 suppresses the LPS/ATP-induced pyroptosis of macrophages in vitro by both neutralizing the action of LPS and inhibiting the response of P2X7 (a nucleotide receptor) to ATP. Thus, in this study, we further evaluated the effect of LL-37 on pyroptosis in vivo using a cecal ligation and puncture (CLP) sepsis model. As a result, the intravenous administration of LL-37 improved the survival of the CLP septic mice. Interestingly, LL-37 inhibited the CLP-induced caspase-1 activation and pyroptosis of peritoneal macrophages. Moreover, LL-37 modulated the levels of inflammatory cytokines (IL-1β, IL-6 and TNF-α) in both peritoneal fluids and sera, and suppressed the activation of peritoneal macrophages (as evidenced by the increase in the intracellular levels of IL-1β, IL-6 and TNF-α). Finally, LL-37 reduced the bacterial burdens in both peritoneal fluids and blood samples. Together, these observations suggest that LL-37 improves the survival of CLP septic mice by possibly suppressing the pyroptosis of macrophages, and inflammatory cytokine production by activated macrophages and bacterial growth. Thus, the present findings imply that LL-37 can be a promising candidate for sepsis because of its many functions, such as the inhibition of pyroptosis, modulation of inflammatory cytokine production and antimicrobial activity.
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Affiliation(s)
- Zhongshuang Hu
- Department of Host Defense and Biochemical Research, Juntendo University, Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Taisuke Murakami
- Department of Host Defense and Biochemical Research, Juntendo University, Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Kaori Suzuki
- Department of Host Defense and Biochemical Research, Juntendo University, Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Hiroshi Tamura
- Department of Host Defense and Biochemical Research, Juntendo University, Graduate School of Medicine, Tokyo 113-8421, Japan Laboratory Program Support (LPS) Consulting Office, Tokyo 160-0023, Japan
| | - Johannes Reich
- Institute of Physical and Theoretical Chemistry, University of Regensburg 93040, Regensburg, Germany
| | - Kyoko Kuwahara-Arai
- Department of Bacteriology, Juntendo University, Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Toshiaki Iba
- Department of Emergency and Disaster Medicine, Juntendo University, Graduate School of Medicine, Tokyo 113-8421, Japan
| | - Isao Nagaoka
- Department of Host Defense and Biochemical Research, Juntendo University, Graduate School of Medicine, Tokyo 113-8421, Japan
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HU ZHONGSHUANG, NAGAOKA ISAO. Modulation of Macrophage Cell Death, Pyroptosis by Host Defense Peptide LL-37. JUNTENDO IJI ZASSHI 2016. [DOI: 10.14789/jmj.62.98] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- ZHONGSHUANG HU
- Department of Host Defense and Biochemical Research, Juntendo University Graduate School of Medicine
| | - ISAO NAGAOKA
- Department of Host Defense and Biochemical Research, Juntendo University Graduate School of Medicine
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49
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Balancing Innate Immunity and Inflammatory State via Modulation of Neutrophil Function: A Novel Strategy to Fight Sepsis. J Immunol Res 2015; 2015:187048. [PMID: 26798659 PMCID: PMC4699010 DOI: 10.1155/2015/187048] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Revised: 11/16/2015] [Accepted: 12/02/2015] [Indexed: 12/29/2022] Open
Abstract
Sepsis and SIRS (systemic inflammatory response syndrome) belong to a severe disease complex characterized by infection and/or a whole-body inflammatory state. There is a growing body of evidence that neutrophils are actively involved in sepsis and are responsible for both release of cytokines and phagocytosis of pathogens. The neutrophil level is mainly regulated by G-CSF, a cytokine and drug, which is widely used in the septic patient with neutropenia. This review will briefly summarize the role of neutrophils and the therapeutic effect of G-CSF in sepsis. We further suggest that targeting neutrophil function to modulate the balance between innate immunity and inflammatory injury could be a worthwhile therapeutic strategy for sepsis.
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50
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Toll-Like Receptor 4 Promotes NO Synthesis by Upregulating GCHI Expression under Oxidative Stress Conditions in Sheep Monocytes/Macrophages. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:359315. [PMID: 26576220 PMCID: PMC4630417 DOI: 10.1155/2015/359315] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 02/26/2015] [Indexed: 12/14/2022]
Abstract
Many groups of Gram-negative bacteria cause diseases that are harmful to sheep. Toll-like receptor 4 (TLR4), which is critical for detecting Gram-negative bacteria by the innate immune system, is activated by lipopolysaccharide (LPS) to initiate inflammatory responses and oxidative stress. Oxidation intermediates are essential activators of oxidative stress, as low levels of free radicals form a stressful oxidative environment that can clear invading pathogens. NO is an oxidation intermediate and its generation is regulated by nitric oxide synthase (iNOS). Guanosine triphosphate cyclohydrolase (GCHI) is the rate-limiting enzyme for tetrahydrobiopterin (BH4) synthesis, which is essential for the production of inducible iNOS. Previously, we made vectors to overexpress the sheep TLR4 gene. Herein, first generation (G1) of transgenic sheep was stimulated with LPS in vivo and in vitro, and oxidative stress and GCHI expression were investigated. Oxidative injury caused by TLR4 overexpression was tightly regulated in tissues. However, the transgenic (Tg) group still secreted nitric oxide (NO) when an iNOS inhibitor was added. Furthermore, GCHI expression remained upregulated in both serum and monocytes/macrophages. Thus, overexpression of TLR4 in transgenic sheep might accelerate the clearance of invading microbes through NO generation following LPS stimulation. Additionally, TLR4 overexpression also enhances GCHI activation.
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