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Tabatabaei FS, Shafeghat M, Azimi A, Akrami A, Rezaei N. Endosomal Toll-Like Receptors intermediate negative impacts of viral diseases, autoimmune diseases, and inflammatory immune responses on the cardiovascular system. Expert Rev Clin Immunol 2024:1-13. [PMID: 39137281 DOI: 10.1080/1744666x.2024.2392815] [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: 04/30/2024] [Revised: 07/17/2024] [Accepted: 08/12/2024] [Indexed: 08/15/2024]
Abstract
INTRODUCTION Cardiovascular disease (CVD) is the leading cause of morbidity globally, with chronic inflammation as a key modifiable risk factor. Toll-like receptors (TLRs), pivotal components of the innate immune system, including TLR-3, -7, -8, and -9 within endosomes, trigger intracellular cascades, leading to inflammatory cytokine production by various cell types, contributing to systemic inflammation and atherosclerosis. Recent research highlights the role of endosomal TLRs in recognizing self-derived nucleic acids during sterile inflammation, implicated in autoimmune conditions like myocarditis. AREAS COVERED This review explores the impact of endosomal TLRs on viral infections, autoimmunity, and inflammatory responses, shedding light on their intricate involvement in cardiovascular health and disease by examining literature on TLR-mediated mechanisms and their roles in CVD pathophysiology. EXPERT OPINION Removal of endosomal TLRs mitigates myocardial damage and immune reactions, applicable in myocardial injury. Targeting TLRs with agonists enhances innate immunity against fatal viruses, lowering viral loads and mortality. Prophylactic TLR agonist administration upregulates TLRs, protecting against fatal viruses and improving survival. TLRs play a complex role in CVDs like atherosclerosis and myocarditis, with therapeutic potential in modulating TLR reactions for cardiovascular health.
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Affiliation(s)
- Fatemeh Sadat Tabatabaei
- School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
- Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | - Melika Shafeghat
- Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Tehran, Iran
- Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
- Research Center for Immunodeficiencies (RCID), Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Amirali Azimi
- School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Ashley Akrami
- Chicago College of Osteopathic Medicine, Midwestern University, Downers Grove, IL, USA
| | - Nima Rezaei
- Network of Immunity in Infection, Malignancy and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Tehran, Iran
- Research Center for Immunodeficiencies (RCID), Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
- Department of Immunology, School of Medicine, Tehran University of Medical Sciences (TUMS), Tehran, Iran
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2
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Wang K, Huang H, Zhan Q, Ding H, Li Y. Toll-like receptors in health and disease. MedComm (Beijing) 2024; 5:e549. [PMID: 38685971 PMCID: PMC11057423 DOI: 10.1002/mco2.549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 03/17/2024] [Accepted: 03/26/2024] [Indexed: 05/02/2024] Open
Abstract
Toll-like receptors (TLRs) are inflammatory triggers and belong to a family of pattern recognition receptors (PRRs) that are central to the regulation of host protective adaptive immune responses. Activation of TLRs in innate immune myeloid cells directs lymphocytes to produce the most appropriate effector responses to eliminate infection and maintain homeostasis of the body's internal environment. Inappropriate TLR stimulation can lead to the development of general autoimmune diseases as well as chronic and acute inflammation, and even cancer. Therefore, TLRs are expected to be targets for therapeutic treatment of inflammation-related diseases, autoimmune diseases, microbial infections, and human cancers. This review summarizes the recent discoveries in the molecular and structural biology of TLRs. The role of different TLR signaling pathways in inflammatory diseases, autoimmune diseases such as diabetes, cardiovascular diseases, respiratory diseases, digestive diseases, and even cancers (oral, gastric, breast, colorectal) is highlighted and summarizes new drugs and related clinical treatments in clinical trials, providing an overview of the potential and prospects of TLRs for the treatment of TLR-related diseases.
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Affiliation(s)
- Kunyu Wang
- Department of Head and Neck Oncology Surgery, State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengduChina
| | - Hanyao Huang
- Department of Oral and Maxillofacial Surgery, State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengduSichuanChina
| | - Qi Zhan
- Department of Head and Neck Oncology Surgery, State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengduChina
| | - Haoran Ding
- Department of Head and Neck Oncology Surgery, State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengduChina
| | - Yi Li
- Department of Head and Neck Oncology Surgery, State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral DiseasesWest China Hospital of StomatologySichuan UniversityChengduChina
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3
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Nishimoto S, Sata M, Fukuda D. Expanding role of deoxyribonucleic acid-sensing mechanism in the development of lifestyle-related diseases. Front Cardiovasc Med 2022; 9:881181. [PMID: 36176986 PMCID: PMC9513035 DOI: 10.3389/fcvm.2022.881181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 08/15/2022] [Indexed: 11/14/2022] Open
Abstract
In lifestyle-related diseases, such as cardiovascular, metabolic, respiratory, and kidney diseases, chronic inflammation plays a causal role in their pathogenesis; however, underlying mechanisms of sterile chronic inflammation are not well-understood. Previous studies have confirmed the damage of cells in these organs in the presence of various risk factors such as diabetes, dyslipidemia, and cigarette smoking, releasing various endogenous ligands for pattern recognition receptors. These studies suggested that nucleic acids released from damaged tissues accumulate in these tissues, acting as an endogenous ligand. Undamaged DNA is an integral factor for the sustenance of life, whereas, DNA fragments, especially those from pathogens, are potent activators of the inflammatory response. Recent studies have indicated that inflammatory responses such as the production of type I interferon (IFN) induced by DNA-sensing mechanisms which contributes to self-defense system in innate immunity participates in the progression of inflammatory diseases by the recognition of nucleic acids derived from the host, including mitochondrial DNA (mtDNA). The body possesses several types of DNA sensors. Toll-like receptor 9 (TLR9) recognizes DNA fragments in the endosomes. In addition, the binding of DNA fragments in the cytosol activates cyclic guanosine monophosphate (GMP)-adenosine monophosphate (AMP) synthase (cGAS), resulting in the synthesis of the second messenger cyclic GMP-AMP (cGAMP). The binding of cGAMP to stimulator of interferon genes (STING) activates NF-κB and TBK-1 signaling and consequently the production of many inflammatory cytokines including IFNs. Numerous previous studies have demonstrated the role of DNA sensors in self-defense through the recognition of DNA fragments derived from pathogens. Beyond the canonical role of TLR9 and cGAS-STING, this review describes the role of these DNA-sensing mechanism in the inflammatory responses caused by endogenous DNA fragments, and in the pathogenesis of lifestyle-related diseases.
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Affiliation(s)
- Sachiko Nishimoto
- Faculty of Clinical Nutrition and Dietetics, Konan Women’s University, Kobe, Japan
- Department of Cardiovascular Medicine, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Masataka Sata
- Department of Cardiovascular Medicine, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - Daiju Fukuda
- Department of Cardiovascular Medicine, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
- Department of Cardiovascular Medicine, Osaka Metropolitan University, Osaka, Japan
- *Correspondence: Daiju Fukuda, ,
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4
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Fukuda D, Pham PT, Sata M. Emerging Roles of the Innate Immune System Regulated by DNA Sensors in the Development of Vascular and Metabolic Diseases. J Atheroscler Thromb 2021; 29:297-307. [PMID: 34248111 PMCID: PMC8894111 DOI: 10.5551/jat.rv17059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Sterile chronic inflammation causes cardiometabolic disorders; however, the mechanisms are not fully understood. Previous studies have demonstrated the degradation of cells/tissues in the vasculature and metabolic organs in lifestyle-associated diseases, such as diabetes and hyperlipidemia, suggesting the release and/or accumulation of nucleic acids from damaged cells. DNA is indispensable for life; however, DNA fragments, especially those from pathogens, strongly induce inflammation by the activation of DNA sensors. Growing evidence suggests that DNA-sensing mechanisms, which are normally involved in self-defense against pathogens as the innate immune system, are associated with the progression of inflammatory diseases in response to endogenous DNA fragments. There are several types of DNA sensors in our bodies. Toll-like receptor 9 (TLR9)—one of the most studied DNA sensors—recognizes DNA fragments in endosome. In addition, stimulator of interferon genes (STING), which has recently been extensively investigated, recognizes cyclic GMP-AMP (cGAMP) generated from DNA fragments in the cytosol. Both TLR9 and STING are known to play pivotal roles in host defense as the innate immune system. However, recent studies have indicated that the activation of these DNA sensors in immune cells, such as macrophages, promotes inflammation leading to the development of vascular and metabolic diseases associated with lifestyle. In this review, we discuss recent advances in determining the roles of DNA sensors in these disease contexts. Revealing a novel mechanism of sterile chronic inflammation regulated by DNA sensors might facilitate clinical interventions for these health conditions.
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Affiliation(s)
- Daiju Fukuda
- Department of Cardiovascular Medicine, Tokushima University Graduate School of Biomedical Sciences
| | - Phuong Tran Pham
- Department of Cardiovascular Medicine, Tokushima University Graduate School of Biomedical Sciences
| | - Masataka Sata
- Department of Cardiovascular Medicine, Tokushima University Graduate School of Biomedical Sciences
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5
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Matsumoto M, Liu J, Iwata K, Ibi M, Asaoka N, Zhang X, Katsuyama M, Matsuda M, Nabe T, Schröder K, Yabe-Nishimura C. NOX1/NADPH oxidase is involved in the LPS-induced exacerbation of collagen-induced arthritis. J Pharmacol Sci 2021; 146:88-97. [PMID: 33941325 DOI: 10.1016/j.jphs.2021.01.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 01/19/2021] [Accepted: 01/25/2021] [Indexed: 11/20/2022] Open
Abstract
We investigate as yet an unidentified role of NOX1, a non-phagocytic isoform of the superoxide-generating NADPH oxidase, in immune responses using Nox1-knockout mice (Nox1-KO). The transcripts of NOX1 was expressed in lymphoid tissues, including the spleen, thymus, bone marrow, and inguinal lymphoid nodes. When antibody production after ovalbumin (OVA) immunization was examined, no significant differences were observed in serum anti-OVA IgG levels between wild-type mice (WT) and Nox1-KO. In the experimental asthma, the infiltration of eosinophils and the Th2 cytokine response after the induction of asthma with OVA were similar between the two genotypes. However, the severity and incidence of experimental collagen-induced arthritis (CIA) following the administration of a low dose of endotoxin (LPS) were significantly lower in Nox1-KO. While neither serum levels of autoantibodies nor in vitro cytokine responses were affected by Nox1 deficiency, NOX1 mRNA levels in the spleen significantly increased after the LPS challenge. Among the spleen cells, remarkable LPS-induced upregulation of NOX1 was demonstrated in both CD11b+ monocytes/macrophages and CD11c+ dendritic cells, suggesting that LPS-inducible NOX1 in monocytes/macrophages/dendritic cells may modulate the development of experimental CIA. Therapeutic targeting of NOX1 may therefore control the onset and/or severity of arthritis which is exacerbated by bacterial infection.
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Affiliation(s)
- Misaki Matsumoto
- Department of Pharmacology, Kyoto Prefectural University of Medicine, Kyoto, Japan.
| | - Junjie Liu
- Department of Pharmacology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Kazumi Iwata
- Department of Pharmacology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Masakazu Ibi
- Department of Pharmacology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Nozomi Asaoka
- Department of Pharmacology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Xueqing Zhang
- Department of Pharmacology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Masato Katsuyama
- Radioisotope Center, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Masaya Matsuda
- Laboratory of Immunopharmacology, Faculty of Pharmaceutical Sciences, Setsunan University, Osaka, Japan
| | - Takeshi Nabe
- Laboratory of Immunopharmacology, Faculty of Pharmaceutical Sciences, Setsunan University, Osaka, Japan
| | - Katrin Schröder
- Institute for Cardiovascular Physiology, Goethe-University, Frankfurt, Germany
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6
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The Impact of the Ca 2+-Independent Phospholipase A 2β (iPLA 2β) on Immune Cells. Biomolecules 2021; 11:biom11040577. [PMID: 33920898 PMCID: PMC8071342 DOI: 10.3390/biom11040577] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 04/06/2021] [Accepted: 04/12/2021] [Indexed: 12/31/2022] Open
Abstract
The Ca2+-independent phospholipase A2β (iPLA2β) is a member of the PLA2 family that has been proposed to have roles in multiple biological processes including membrane remodeling, cell proliferation, bone formation, male fertility, cell death, and signaling. Such involvement has led to the identification of iPLA2β activation in several diseases such as cancer, cardiovascular abnormalities, glaucoma, periodontitis, neurological disorders, diabetes, and other metabolic disorders. More recently, there has been heightened interest in the role that iPLA2β plays in promoting inflammation. Recognizing the potential contribution of iPLA2β in the development of autoimmune diseases, we review this issue in the context of an iPLA2β link with macrophages and T-cells.
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7
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Hofeld BC, Puppala VK, Tyagi S, Ahn KW, Anger A, Jia S, Salzman NH, Hessner MJ, Widlansky ME. Lactobacillus plantarum 299v probiotic supplementation in men with stable coronary artery disease suppresses systemic inflammation. Sci Rep 2021; 11:3972. [PMID: 33597583 PMCID: PMC7889883 DOI: 10.1038/s41598-021-83252-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Accepted: 01/25/2021] [Indexed: 12/15/2022] Open
Abstract
Recent trials demonstrate that systemic anti-inflammatory therapy reduces cardiovascular events in coronary artery disease (CAD) patients. We recently demonstrated Lactobacillus plantarum 299v (Lp299v) supplementation improved vascular endothelial function in men with stable CAD. Whether this favorable effect is in part due to anti-inflammatory action remains unknown. Testing this hypothesis, we exposed plasma obtained before and after Lp299v supplementation from these subjects to a healthy donor's PBMCs and measured differences in the PBMC transciptome, performed gene ontological analyses, and compared Lp299v-induced transcriptome changes with changes in vascular function. Daily alcohol users (DAUs) (n = 4) had a significantly different response to Lp299v and were separated from the main analyses. Non-DAUs- (n = 15) showed improved brachial flow-mediated dilation (FMD) and reduced circulating IL-8, IL-12, and leptin. 997 genes were significantly changed. I.I.com decreased (1.01 ± 0.74 vs. 0.22 ± 0.51; P < 0.0001), indicating strong anti-inflammatory effects. Pathway analyses revealed downregulation of IL-1β, interferon-stimulated pathways, and toll-like receptor signaling, and an increase in regulator T-cell (Treg) activity. Reductions in GBP1, JAK2, and TRAIL expression correlated with improved FMD. In non-DAU men with stable CAD, post-Lp299v supplementation plasma induced anti-inflammatory transcriptome changes in human PBMCs that could benefit CAD patients. Future studies should delineate changes in circulating metabolites responsible for these effects.
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Affiliation(s)
- Benjamin C Hofeld
- Department of Medicine, Division of Cardiovascular Medicine, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Venkata K Puppala
- Department of Medicine, Division of Cardiovascular Medicine, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Sudhi Tyagi
- Department of Medicine, Division of Cardiovascular Medicine, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Kwang Woo Ahn
- Department of Biostatistics, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Amberly Anger
- Department of Medicine, Division of Cardiovascular Medicine, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Shuang Jia
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Nita H Salzman
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI, USA
- Department of Microbiology and Immunology, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Martin J Hessner
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI, USA
| | - Michael E Widlansky
- Department of Medicine, Division of Cardiovascular Medicine, Medical College of Wisconsin, Milwaukee, WI, USA.
- Division of Cardiovascular Medicine, Professor of Medicine and Pharmacology, Medical College of Wisconsin, Hub for Collaborative Medicine, 5th Floor A5743, 8701 W. Watertown Plank Road, Milwaukee, WI, 53226, USA.
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8
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Zaric BL, Radovanovic JN, Gluvic Z, Stewart AJ, Essack M, Motwalli O, Gojobori T, Isenovic ER. Atherosclerosis Linked to Aberrant Amino Acid Metabolism and Immunosuppressive Amino Acid Catabolizing Enzymes. Front Immunol 2020; 11:551758. [PMID: 33117340 PMCID: PMC7549398 DOI: 10.3389/fimmu.2020.551758] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 08/25/2020] [Indexed: 02/05/2023] Open
Abstract
Cardiovascular disease is the leading global health concern and responsible for more deaths worldwide than any other type of disorder. Atherosclerosis is a chronic inflammatory disease in the arterial wall, which underpins several types of cardiovascular disease. It has emerged that a strong relationship exists between alterations in amino acid (AA) metabolism and the development of atherosclerosis. Recent studies have reported positive correlations between levels of branched-chain amino acids (BCAAs) such as leucine, valine, and isoleucine in plasma and the occurrence of metabolic disturbances. Elevated serum levels of BCAAs indicate a high cardiometabolic risk. Thus, BCAAs may also impact atherosclerosis prevention and offer a novel therapeutic strategy for specific individuals at risk of coronary events. The metabolism of AAs, such as L-arginine, homoarginine, and L-tryptophan, is recognized as a critical regulator of vascular homeostasis. Dietary intake of homoarginine, taurine, and glycine can improve atherosclerosis by endothelium remodeling. Available data also suggest that the regulation of AA metabolism by indoleamine 2,3-dioxygenase (IDO) and arginases 1 and 2 are mediated through various immunological signals and that immunosuppressive AA metabolizing enzymes are promising therapeutic targets against atherosclerosis. Further clinical studies and basic studies that make use of animal models are required. Here we review recent data examining links between AA metabolism and the development of atherosclerosis.
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Affiliation(s)
- Bozidarka L. Zaric
- Department of Radiobiology and Molecular Genetics, “VINČA” Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Jelena N. Radovanovic
- Department of Radiobiology and Molecular Genetics, “VINČA” Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Zoran Gluvic
- Department of Endocrinology and Diabetes, Faculty of Medicine, University Clinical-Hospital Centre Zemun-Belgrade, University of Belgrade, Belgrade, Serbia
| | - Alan J. Stewart
- School of Medicine, University of St Andrews, St Andrews, United Kingdom
| | - Magbubah Essack
- Computer, Electrical and Mathematical Sciences and Engineering Division (CEMSE), Computational Bioscience Research Center, Computer (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Olaa Motwalli
- College of Computing and Informatics, Saudi Electronic University (SEU), Medina, Saudi Arabia
| | - Takashi Gojobori
- Computer, Electrical and Mathematical Sciences and Engineering Division (CEMSE), Computational Bioscience Research Center, Computer (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
- Biological and Environmental Sciences and Engineering Division (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Esma R. Isenovic
- Department of Radiobiology and Molecular Genetics, “VINČA” Institute of Nuclear Sciences - National Institute of the Republic of Serbia, University of Belgrade, Belgrade, Serbia
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Nishimoto S, Fukuda D, Sata M. Emerging roles of Toll-like receptor 9 in cardiometabolic disorders. Inflamm Regen 2020; 40:18. [PMID: 32714475 PMCID: PMC7374824 DOI: 10.1186/s41232-020-00118-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2020] [Accepted: 05/21/2020] [Indexed: 02/08/2023] Open
Abstract
Growing evidence suggests that damage-associated molecule patterns (DAMPs) and their receptors, pattern recognition receptors (PRRs), are associated with the progression of cardiometabolic disorders, including obesity-related insulin resistance and atherosclerosis. Cardiometabolic disorders share sterile chronic inflammation as a major cause; however, the exact mechanisms are still obscure. Toll-like receptor 9 (TLR9), one of the nucleic acid-sensing TLRs, recognizes DNA fragments derived from pathogens and contributes to self-defense by activation of the innate immune system. In addition, previous studies demonstrated that TLR9 recognizes DNA fragments released from host cells, accelerating sterile inflammation, which is associated with inflammatory diseases such as autoimmune diseases. In obese adipose tissue and atherosclerotic vascular tissue, various stresses release DNA fragments and/or nuclear proteins as DAMPs from degenerated adipocytes and vascular cells. Recent studies indicated that the activation of TLR9 in immune cells including macrophages and dendritic cells by recognition of these DAMPs promotes inflammation in these tissues, which causes cardiometabolic disorders. This review discusses recent advances in understanding the role of sterile inflammation associated with TLR9 and its endogenous ligands in cardiometabolic disorders. New insights into innate immunity may provide better understanding of cardiometabolic disorders and new therapeutic options for these major health threats in recent decades.
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Affiliation(s)
- Sachiko Nishimoto
- Department of Cardiovascular Medicine, Tokushima University Graduate School of Biomedical Sciences, 3-18-15, Kuramoto-cho, Tokushima, 770-8503 Japan
| | - Daiju Fukuda
- Department of Cardio-Diabetes Medicine, Tokushima University Graduate School of Biomedical Sciences, Tokushima, 770-8503 Japan
| | - Masataka Sata
- Department of Cardiovascular Medicine, Tokushima University Graduate School of Biomedical Sciences, 3-18-15, Kuramoto-cho, Tokushima, 770-8503 Japan
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Zhou Y, Little PJ, Downey L, Afroz R, Wu Y, Ta HT, Xu S, Kamato D. The Role of Toll-like Receptors in Atherothrombotic Cardiovascular Disease. ACS Pharmacol Transl Sci 2020; 3:457-471. [PMID: 32566912 PMCID: PMC7296543 DOI: 10.1021/acsptsci.9b00100] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Indexed: 02/06/2023]
Abstract
Toll-like receptors (TLRs) are dominant components of the innate immune system. Activated by both pathogen-associated molecular patterns and damage-associated molecular patterns, TLRs underpin the pathology of numerous inflammation related diseases that include not only immune diseases, but also cardiovascular disease (CVD), diabetes, obesity, and cancers. Growing evidence has demonstrated that TLRs are involved in multiple cardiovascular pathophysiologies, such as atherosclerosis and hypertension. Specifically, a trial called the Canakinumab Anti-inflammatory Thrombosis Outcomes Study showed the use of an antibody that neutralizes interleukin-1β, reduces the recurrence of cardiovascular events, demonstrating inflammation as a therapeutic target and also the research value of targeting the TLR system in CVD. In this review, we provide an update of the interplay between TLR signaling, inflammatory mediators, and atherothrombosis, with an aim to identify new therapeutic targets for atherothrombotic CVD.
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Affiliation(s)
- Ying Zhou
- School
of Pharmacy, University of Queensland, Pharmacy
Australia Centre of Excellence, Woolloongabba, Queensland 4102, Australia
| | - Peter J. Little
- School
of Pharmacy, University of Queensland, Pharmacy
Australia Centre of Excellence, Woolloongabba, Queensland 4102, Australia
- Department
of Pharmacy, Xinhua College of Sun Yat-Sen
University, Tianhe District, Guangzhou, Guangdong Province 510520, China
| | - Liam Downey
- School
of Pharmacy, University of Queensland, Pharmacy
Australia Centre of Excellence, Woolloongabba, Queensland 4102, Australia
| | - Rizwana Afroz
- School
of Pharmacy, University of Queensland, Pharmacy
Australia Centre of Excellence, Woolloongabba, Queensland 4102, Australia
| | - Yuao Wu
- Australian
Institute for Bioengineering and Nanotechnology, University of Queensland, Brisbane, St Lucia, Queensland 4072, Australia
| | - Hang T. Ta
- School
of Pharmacy, University of Queensland, Pharmacy
Australia Centre of Excellence, Woolloongabba, Queensland 4102, Australia
- Australian
Institute for Bioengineering and Nanotechnology, University of Queensland, Brisbane, St Lucia, Queensland 4072, Australia
| | - Suowen Xu
- Aab
Cardiovascular Research Institute, Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, New York 14642, United States
| | - Danielle Kamato
- School
of Pharmacy, University of Queensland, Pharmacy
Australia Centre of Excellence, Woolloongabba, Queensland 4102, Australia
- Department
of Pharmacy, Xinhua College of Sun Yat-Sen
University, Tianhe District, Guangzhou, Guangdong Province 510520, China
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11
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Signaling Pathways and Key Genes Involved in Regulation of foam Cell Formation in Atherosclerosis. Cells 2020; 9:cells9030584. [PMID: 32121535 PMCID: PMC7140394 DOI: 10.3390/cells9030584] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 02/22/2020] [Accepted: 02/25/2020] [Indexed: 02/07/2023] Open
Abstract
Atherosclerosis is associated with acute cardiovascular conditions, such as ischemic heart disease, myocardial infarction, and stroke, and is the leading cause of morbidity and mortality worldwide. Our understanding of atherosclerosis and the processes triggering its initiation is constantly improving, and, during the last few decades, many pathological processes related to this disease have been investigated in detail. For example, atherosclerosis has been considered to be a chronic inflammation triggered by the injury of the arterial wall. However, recent works showed that atherogenesis is a more complex process involving not only the immune system, but also resident cells of the vessel wall, genetic factors, altered hemodynamics, and changes in lipid metabolism. In this review, we focus on foam cells that are crucial for atherosclerosis lesion formation. It has been demonstrated that the formation of foam cells is induced by modified low-density lipoprotein (LDL). The beneficial effects of the majority of therapeutic strategies with generalized action, such as the use of anti-inflammatory drugs or antioxidants, were not confirmed by clinical studies. However, the experimental therapies targeting certain stages of atherosclerosis, among which are lipid accumulation, were shown to be more effective. This emphasizes the relevance of future detailed investigation of atherogenesis and the importance of new therapies development.
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12
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Poria cocos polysaccharides attenuated ox-LDL-induced inflammation and oxidative stress via ERK activated Nrf2/HO-1 signaling pathway and inhibited foam cell formation in VSMCs. Int Immunopharmacol 2020; 80:106173. [DOI: 10.1016/j.intimp.2019.106173] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 12/24/2019] [Accepted: 12/28/2019] [Indexed: 12/31/2022]
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13
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Yehualashet AS. Toll-like Receptors as a Potential Drug Target for Diabetes Mellitus and Diabetes-associated Complications. Diabetes Metab Syndr Obes 2020; 13:4763-4777. [PMID: 33311992 PMCID: PMC7724365 DOI: 10.2147/dmso.s274844] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 11/03/2020] [Indexed: 12/15/2022] Open
Abstract
Diabetes mellitus (DM) is a chronic endocrine disease distinguished by hyperglycemia due to disturbance in carbohydrate or lipid metabolism or insulin function. To date, diabetes, and its complications, is established as a global cause of morbidity and mortality. The intended aim during the management of diabetes is to maintain blood glucose close to normal because the majority of patients have poor control of their elevated blood glucose and are highly prone to severe macrovascular and microvascular complications. To decrease the burden of the disease and its complications, scientists from various disciplines are working intensively to identify novel and promising drug targets for diabetes and its complications. Increased and ongoing investigations on mechanisms relating to diabetes and associated complications could potentially consider inflammatory cascades as a promising component of the strategy in the prevention and control of diabetes and its complications. The potential of targeting mediators of inflammation like toll-like receptors (TLRs) are part of current investigation by the scientific community. Hence, the aim of the present review is to discuss the role of TLRs as a potential drug target for diabetes and diabetes associated complications.
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Affiliation(s)
- Awgichew Shewasinad Yehualashet
- Pharmacology and Toxicology Unit, Department of Pharmacy, College of Health Sciences, Debre Berhan University, Debre Berhan, Ethiopia
- Correspondence: Awgichew Shewasinad Yehualashet Pharmacology and Toxicology Unit, Department of Pharmacy, College of Health Sciences, Debre Berhan University, Debre Berhan, EthiopiaTel +251935450290 Email
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14
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Nelson AJ, Stephenson DJ, Cardona CL, Lei X, Almutairi A, White TD, Tusing YG, Park MA, Barbour SE, Chalfant CE, Ramanadham S. Macrophage polarization is linked to Ca 2+-independent phospholipase A 2β-derived lipids and cross-cell signaling in mice. J Lipid Res 2019; 61:143-158. [PMID: 31818877 DOI: 10.1194/jlr.ra119000281] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Revised: 11/27/2019] [Indexed: 12/27/2022] Open
Abstract
Phospholipases A2 (PLA2s) catalyze hydrolysis of the sn-2 substituent from glycerophospholipids to yield a free fatty acid (i.e., arachidonic acid), which can be metabolized to pro- or anti-inflammatory eicosanoids. Macrophages modulate inflammatory responses and are affected by Ca2+-independent phospholipase A2 (PLA2)β (iPLA2β). Here, we assessed the link between iPLA2β-derived lipids (iDLs) and macrophage polarization. Macrophages from WT and KO (iPLA2β-/-) mice were classically M1 pro-inflammatory phenotype activated or alternatively M2 anti-inflammatory phenotype activated, and eicosanoid production was determined by ultra-performance LC ESI-MS/MS. As a genotypic control, we performed similar analyses on macrophages from RIP.iPLA2β.Tg mice with selective iPLA2β overexpression in β-cells. Compared with WT, generation of select pro-inflammatory prostaglandins (PGs) was lower in iPLA2β-/- , and that of a specialized pro-resolving lipid mediator (SPM), resolvin D2, was higher; both changes are consistent with the M2 phenotype. Conversely, macrophages from RIP.iPLA2β.Tg mice exhibited an opposite landscape, one associated with the M1 phenotype: namely, increased production of pro-inflammatory eicosanoids (6-keto PGF1α, PGE2, leukotriene B4) and decreased ability to generate resolvin D2. These changes were not linked with secretory PLA2 or cytosolic PLA2α or with leakage of the transgene. Thus, we report previously unidentified links between select iPLA2β-derived eicosanoids, an SPM, and macrophage polarization. Importantly, our findings reveal for the first time that β-cell iPLA2β-derived signaling can predispose macrophage responses. These findings suggest that iDLs play critical roles in macrophage polarization, and we posit that they could be targeted therapeutically to counter inflammation-based disorders.
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Affiliation(s)
- Alexander J Nelson
- Department of Cell, Developmental, and Integrative Biology University of Alabama at Birmingham, Birmingham, AL 35294.,Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Daniel J Stephenson
- Department of Cell Biology, Microbiology, and Molecular Biology (CMMB), University of South Florida, Tampa, FL 33620
| | - Christopher L Cardona
- Department of Cell Biology, Microbiology, and Molecular Biology (CMMB), University of South Florida, Tampa, FL 33620
| | - Xiaoyong Lei
- Department of Cell, Developmental, and Integrative Biology University of Alabama at Birmingham, Birmingham, AL 35294.,Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Abdulaziz Almutairi
- Department of Cell, Developmental, and Integrative Biology University of Alabama at Birmingham, Birmingham, AL 35294.,Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Tayleur D White
- Department of Cell, Developmental, and Integrative Biology University of Alabama at Birmingham, Birmingham, AL 35294.,Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Ying G Tusing
- Department of Cell, Developmental, and Integrative Biology University of Alabama at Birmingham, Birmingham, AL 35294.,Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Margaret A Park
- Department of Cell Biology, Microbiology, and Molecular Biology (CMMB), University of South Florida, Tampa, FL 33620
| | - Suzanne E Barbour
- Department of Biochemistry and Molecular Biology, University of Georgia, Athens, GA 30602
| | - Charles E Chalfant
- Department of Cell Biology, Microbiology, and Molecular Biology (CMMB), University of South Florida, Tampa, FL 33620.,Research Service, James A. Haley Veterans Hospital, Tampa, FL 33612
| | - Sasanka Ramanadham
- Department of Cell, Developmental, and Integrative Biology University of Alabama at Birmingham, Birmingham, AL 35294 .,Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL 35294
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15
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Chistiakov DA, Kashirskikh DA, Khotina VA, Grechko AV, Orekhov AN. Immune-Inflammatory Responses in Atherosclerosis: The Role of Myeloid Cells. J Clin Med 2019; 8:jcm8111798. [PMID: 31717832 PMCID: PMC6912749 DOI: 10.3390/jcm8111798] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 10/24/2019] [Indexed: 01/28/2023] Open
Abstract
Inflammation plays a key role in the initiation and progression of atherosclerosis and can be caused by multiple agents, including increased concentration of circulating low-density lipoprotein (LDL) cholesterol. Areas of the arterial wall affected by atherosclerosis are enriched with lymphocytes and dendritic cells (DCs). Atherosclerotic plaques contain a variety of proinflammatory immune cells, such as macrophages, DCs, T cells, natural killer cells, neutrophils and others. Intracellular lipid accumulation in atherosclerotic plaque leads to formation of so-called foam cells, the cytoplasm of which is filled with lipid droplets. According to current understanding, these cells can also derive from the immune cells that engulf lipids by means of phagocytosis. Macrophages play a crucial role in the initial stages of atherogenesis by engulfing oxidized LDL (oxLDL) in the intima that leads to their transformation to foam cells. Dying macrophages inside the plaque form a necrotic core that further aggravates the lesion. Proinflammatory DCs prime differentiation of naïve T cells to proinflammatory Th1 and Th17 subsets. In this review, we discuss the roles of cell types of myeloid origin in atherosclerosis-associated inflammation.
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Affiliation(s)
- Dimitry A. Chistiakov
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, 125315 Moscow, Russia; (D.A.C.); (D.A.K.); (V.A.K.)
| | - Dmitry A. Kashirskikh
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, 125315 Moscow, Russia; (D.A.C.); (D.A.K.); (V.A.K.)
| | - Victoriya A. Khotina
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, 125315 Moscow, Russia; (D.A.C.); (D.A.K.); (V.A.K.)
| | - Andrey V. Grechko
- Federal Research and Clinical Center of Intensive Care Medicine and Rehabilitology, 109240 Moscow, Russia;
| | - Alexander N. Orekhov
- Laboratory of Angiopathology, Institute of General Pathology and Pathophysiology, 125315 Moscow, Russia; (D.A.C.); (D.A.K.); (V.A.K.)
- Institute of Human Morphology, Tsyrupa st. 3, 117418 Moscow, Russia
- Correspondence: ; Tel.: +7-903-169-08-66
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16
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Turk J, White TD, Nelson AJ, Lei X, Ramanadham S. iPLA 2β and its role in male fertility, neurological disorders, metabolic disorders, and inflammation. Biochim Biophys Acta Mol Cell Biol Lipids 2018; 1864:846-860. [PMID: 30408523 DOI: 10.1016/j.bbalip.2018.10.010] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Revised: 10/26/2018] [Accepted: 10/29/2018] [Indexed: 02/06/2023]
Abstract
The Ca2+-independent phospholipases, designated as group VI iPLA2s, also referred to as PNPLAs due to their shared homology with patatin, include the β, γ, δ, ε, ζ, and η forms of the enzyme. The iPLA2s are ubiquitously expressed, share a consensus GXSXG catalytic motif, and exhibit organelle/cell-specific localization. Among the iPLA2s, iPLA2β has received wide attention as it is recognized to be involved in membrane remodeling, cell proliferation, cell death, and signal transduction. Ongoing studies implicate participation of iPLA2β in a variety of disease processes including cancer, cardiovascular abnormalities, glaucoma, and peridonditis. This review will focus on iPLA2β and its links to male fertility, neurological disorders, metabolic disorders, and inflammation.
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Affiliation(s)
- John Turk
- Department of Medicine, Washington University School of Medicine, St. Louis, MO, United States of America
| | - Tayleur D White
- Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, United States of America; Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL, United States of America
| | - Alexander J Nelson
- Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, United States of America; Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL, United States of America
| | - Xiaoyong Lei
- Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, United States of America; Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL, United States of America
| | - Sasanka Ramanadham
- Department of Cell, Developmental, and Integrative Biology, University of Alabama at Birmingham, Birmingham, AL, United States of America; Comprehensive Diabetes Center, University of Alabama at Birmingham, Birmingham, AL, United States of America.
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17
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PRR Function of Innate Immune Receptors in Recognition of Bacteria or Bacterial Ligands. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1112:255-280. [DOI: 10.1007/978-981-13-3065-0_18] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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18
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Teixeira G, Szyndralewiez C, Molango S, Carnesecchi S, Heitz F, Wiesel P, Wood JM. Therapeutic potential of NADPH oxidase 1/4 inhibitors. Br J Pharmacol 2017; 174:1647-1669. [PMID: 27273790 PMCID: PMC5446584 DOI: 10.1111/bph.13532] [Citation(s) in RCA: 118] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 05/23/2016] [Accepted: 05/23/2016] [Indexed: 12/16/2022] Open
Abstract
The NADPH oxidase (NOX) family of enzymes produces ROS as their sole function and is becoming recognized as key modulators of signal transduction pathways with a physiological role under acute stress and a pathological role after excessive activation under chronic stress. The seven isoforms differ in their regulation, tissue and subcellular localization and ROS products. The most studied are NOX1, 2 and 4. Genetic deletion of NOX1 and 4, in contrast to NOX2, has revealed no significant spontaneous pathologies and a pathogenic relevance of both NOX1 and 4 across multiple organs in a wide range of diseases and in particular inflammatory and fibrotic diseases. This has stimulated interest in NOX inhibitors for therapeutic application. GKT136901 and GKT137831 are two structurally related compounds demonstrating a preferential inhibition of NOX1 and 4 that have suitable properties for in vivo studies and have consequently been evaluated across a range of disease models and compared with gene deletion. In contrast to gene deletion, these inhibitors do not completely suppress ROS production, maintaining some basal level of ROS. Despite this and consistent with most gene deletion studies, these inhibitors are well tolerated and slow or prevent disease progression in a range of models of chronic inflammatory and fibrotic diseases by modulating common signal transduction pathways. Clinical trials in patients with GKT137831 have demonstrated excellent tolerability and reduction of various markers of chronic inflammation. NOX1/4 inhibition may provide a safe and effective therapeutic strategy for a range of inflammatory and fibrotic diseases. LINKED ARTICLES This article is part of a themed section on Redox Biology and Oxidative Stress in Health and Disease. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v174.12/issuetoc.
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Affiliation(s)
- G Teixeira
- Evotec International GmbHGoettingenGermany
| | | | - S Molango
- Genkyotex SAPlan les OuatesSwitzerland
| | | | - F Heitz
- Genkyotex SAPlan les OuatesSwitzerland
| | - P Wiesel
- Genkyotex SAPlan les OuatesSwitzerland
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19
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TLR3 and TLR4 as potential clinical biomarkers for in-stent restenosis in drug-eluting stents patients. Immunol Res 2016; 64:424-30. [PMID: 26318748 DOI: 10.1007/s12026-015-8685-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
In-stent restenosis is still a clinic trouble for percutaneous coronary intervention in drug-stent era. The molecular basis of restenosis is intensively associated with inflammation. TLR3 and TLR4 as innate immune factors have been proven to play a key role in atherosclerosis disease. The aim of this study is to study the TLR3 and TLR4 expressions and their downstream signaling proteins in the inflammatory process of restenosis after drug-stent therapy. mRNA and protein expression of TLR3 and TLR4 were detected in peripheral blood monocytes of primary group (n = 38), N-ISR group (n = 36) and ISR group (n = 33). Some inflammatory factors (including TLR3 and TLR4) were evaluated in serum of three groups. mRNA and protein expression of TLR3 and TLR4 and their downstream signaling proteins have shown a higher level in restenosis patients than non-restenosis patients and even primary patients who accepted first stent therapy. In serum, different from some nonspecific and downstream inflammatory factors, TLR3 and TLR4 also show a significantly higher level in ISR group compared with N-ISR group and primary group. This study provides a potential clinical biomarker for in-stent restenosis in drug-stent patients and some interesting data about the role of TLRs and their downstream signaling factors in the inflammatory process of in-stent restenosis. Compared with first stent therapy and non-restenosis patients, it is hopeful that TLR3 and TLR4 are potential noninvasive biomarkers in prognosis restenosis.
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20
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Grace PM, Gaudet AD, Staikopoulos V, Maier SF, Hutchinson MR, Salvemini D, Watkins LR. Nitroxidative Signaling Mechanisms in Pathological Pain. Trends Neurosci 2016; 39:862-879. [PMID: 27842920 PMCID: PMC5148691 DOI: 10.1016/j.tins.2016.10.003] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2016] [Revised: 10/18/2016] [Accepted: 10/20/2016] [Indexed: 12/14/2022]
Abstract
Tissue injury can initiate bidirectional signaling between neurons, glia, and immune cells that creates and amplifies pain. While the ability for neurotransmitters, neuropeptides, and cytokines to initiate and maintain pain has been extensively studied, recent work has identified a key role for reactive oxygen and nitrogen species (ROS/RNS; nitroxidative species), including superoxide, peroxynitrite, and hydrogen peroxide. In this review we describe how nitroxidative species are generated after tissue injury and the mechanisms by which they enhance neuroexcitability in pain pathways. Finally, we discuss potential therapeutic strategies for normalizing nitroxidative signaling, which may also enhance opioid analgesia, to help to alleviate the enormous burden of pathological pain.
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Affiliation(s)
- Peter M Grace
- Department of Psychology and Neuroscience, and the Center for Neuroscience, University of Colorado, Boulder, CO, USA; Current address: Department of Critical Care Research, University of Texas MD Anderson Cancer Center, Houston, TX, USA.
| | - Andrew D Gaudet
- Department of Psychology and Neuroscience, and the Center for Neuroscience, University of Colorado, Boulder, CO, USA
| | - Vasiliki Staikopoulos
- Discipline of Physiology, School of Medicine, and the Australian Research Council (ARC) Centre for Nanoscale BioPhotonics (CNBP), University of Adelaide, Adelaide, SA, Australia
| | - Steven F Maier
- Department of Psychology and Neuroscience, and the Center for Neuroscience, University of Colorado, Boulder, CO, USA
| | - Mark R Hutchinson
- Discipline of Physiology, School of Medicine, and the Australian Research Council (ARC) Centre for Nanoscale BioPhotonics (CNBP), University of Adelaide, Adelaide, SA, Australia
| | - Daniela Salvemini
- Department of Pharmacology and Physiology, Saint Louis University School of Medicine, St. Louis, MO, USA
| | - Linda R Watkins
- Department of Psychology and Neuroscience, and the Center for Neuroscience, University of Colorado, Boulder, CO, USA
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21
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Short JD, Downs K, Tavakoli S, Asmis R. Protein Thiol Redox Signaling in Monocytes and Macrophages. Antioxid Redox Signal 2016; 25:816-835. [PMID: 27288099 PMCID: PMC5107717 DOI: 10.1089/ars.2016.6697] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
SIGNIFICANCE Monocyte and macrophage dysfunction plays a critical role in a wide range of inflammatory disease processes, including obesity, impaired wound healing diabetic complications, and atherosclerosis. Emerging evidence suggests that the earliest events in monocyte or macrophage dysregulation include elevated reactive oxygen species production, thiol modifications, and disruption of redox-sensitive signaling pathways. This review focuses on the current state of research in thiol redox signaling in monocytes and macrophages, including (i) the molecular mechanisms by which reversible protein-S-glutathionylation occurs, (ii) the identification of bona fide S-glutathionylated proteins that occur under physiological conditions, and (iii) how disruptions of thiol redox signaling affect monocyte and macrophage functions and contribute to atherosclerosis. Recent Advances: Recent advances in redox biochemistry and biology as well as redox proteomic techniques have led to the identification of many new thiol redox-regulated proteins and pathways. In addition, major advances have been made in expanding the list of S-glutathionylated proteins and assessing the role that protein-S-glutathionylation and S-glutathionylation-regulating enzymes play in monocyte and macrophage functions, including monocyte transmigration, macrophage polarization, foam cell formation, and macrophage cell death. CRITICAL ISSUES Protein-S-glutathionylation/deglutathionylation in monocytes and macrophages has emerged as a new and important signaling paradigm, which provides a molecular basis for the well-established relationship between metabolic disorders, oxidative stress, and cardiovascular diseases. FUTURE DIRECTIONS The identification of specific S-glutathionylated proteins as well as the mechanisms that control this post-translational protein modification in monocytes and macrophages will facilitate the development of new preventive and therapeutic strategies to combat atherosclerosis and other metabolic diseases. Antioxid. Redox Signal. 25, 816-835.
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Affiliation(s)
- John D Short
- 1 Department of Pharmacology, University of Texas Health Science Center at San Antonio , San Antonio, Texas
| | - Kevin Downs
- 2 Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio , San Antonio, Texas
| | - Sina Tavakoli
- 3 Department of Radiology, University of Texas Health Science Center at San Antonio , San Antonio, Texas
| | - Reto Asmis
- 4 Department of Clinical Laboratory Sciences, University of Texas Health Science Center at San Antonio , San Antonio, Texas.,5 Department of Biochemistry, University of Texas Health Science Center at San Antonio , San Antonio, Texas
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22
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TRIF is a regulator of TLR2-induced foam cell formation. Mol Med Rep 2016; 14:3329-35. [PMID: 27572666 DOI: 10.3892/mmr.2016.5647] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 04/20/2016] [Indexed: 11/05/2022] Open
Abstract
The activation of toll-like receptor 2 (TLR2) stimulates foam cell formation, which is a key early event in the process of atherosclerosis. In the present study, the role of toll/interleukin-1 receptor-domain-containing adaptor-inducing interferon-β (TRIF) in TLR2-mediated foam cell formation was investigated, and the importance of monocyte chemoattractant protein‑1 (MCP‑1), tissue factor (TF) and lectin‑like oxidized low‑density lipoprotein receptor‑1 (Lox‑1) were examined. Treatment of Raw 264.7 cells with the TLR2 agonist. Pam3CSK4, increased the gene expression of TRIF in a time‑dependent manner (RT‑PCR). The induced gene expression of TRIF stimulated by TLR2 was not observed in TLR2‑knockout mice‑derived bone marrow‑derived macrophages (BMDMs). Pam3CSK4 increased the mRNA expression of TRIF in the wild‑type BMDMs, but not in the TLR2‑knockout BMDMs. Knockdown of the expression of TRIF using small interfering RNA decreased Pam3CSK4‑induced foam cell formation (combination of oil‑red O and hematoxylin staining), suggesting a role of TRIF. Stimulation of TLR2 increased the expression levels of various genes, which are known to control atherosclerosis, including MCP‑1, TF and Lox‑1. The knockdown of TRIF also attenuated the Pam3CSK4‑induced expression of these genes. In addition, a reduction in TRIF affected the Pam3CSK4‑induced protein expression of MCP‑1 (EIA). Taken together, the results of the present study suggested that TRIF regulated foam cell formation via regulation of the expression levels of MCP‑1, TF and Lox‑1.
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23
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Nishimoto S, Fukuda D, Higashikuni Y, Tanaka K, Hirata Y, Murata C, Kim-Kaneyama JR, Sato F, Bando M, Yagi S, Soeki T, Hayashi T, Imoto I, Sakaue H, Shimabukuro M, Sata M. Obesity-induced DNA released from adipocytes stimulates chronic adipose tissue inflammation and insulin resistance. SCIENCE ADVANCES 2016; 2:e1501332. [PMID: 27051864 PMCID: PMC4820373 DOI: 10.1126/sciadv.1501332] [Citation(s) in RCA: 167] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 02/11/2016] [Indexed: 05/08/2023]
Abstract
Obesity stimulates chronic inflammation in adipose tissue, which is associated with insulin resistance, although the underlying mechanism remains largely unknown. Here we showed that obesity-related adipocyte degeneration causes release of cell-free DNA (cfDNA), which promotes macrophage accumulation in adipose tissue via Toll-like receptor 9 (TLR9), originally known as a sensor of exogenous DNA fragments. Fat-fed obese wild-type mice showed increased release of cfDNA, as determined by the concentrations of single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA) in plasma. cfDNA released from degenerated adipocytes promoted monocyte chemoattractant protein-1 (MCP-1) expression in wild-type macrophages, but not in TLR9-deficient (Tlr9 (-/-) ) macrophages. Fat-fed Tlr9 (-/-) mice demonstrated reduced macrophage accumulation and inflammation in adipose tissue and better insulin sensitivity compared with wild-type mice, whereas bone marrow reconstitution with wild-type bone marrow restored the attenuation of insulin resistance observed in fat-fed Tlr9 (-/-) mice. Administration of a TLR9 inhibitory oligonucleotide to fat-fed wild-type mice reduced the accumulation of macrophages in adipose tissue and improved insulin resistance. Furthermore, in humans, plasma ssDNA level was significantly higher in patients with computed tomography-determined visceral obesity and was associated with homeostasis model assessment of insulin resistance (HOMA-IR), which is the index of insulin resistance. Our study may provide a novel mechanism for the development of sterile inflammation in adipose tissue and a potential therapeutic target for insulin resistance.
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Affiliation(s)
- Sachiko Nishimoto
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Daiju Fukuda
- Department of Cardiovascular Medicine, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
- Corresponding author. E-mail: (D.F.); (M.S.)
| | - Yasutomi Higashikuni
- Department of Cardiovascular Medicine, The University of Tokyo, Tokyo 113-8655, Japan
| | - Kimie Tanaka
- Division for Health Service Promotion, The University of Tokyo, Tokyo 113-8655, Japan
| | - Yoichiro Hirata
- Department of Pediatrics, The University of Tokyo Hospital, Tokyo 113-8655, Japan
| | - Chie Murata
- Department of Human Genetics, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Joo-ri Kim-Kaneyama
- Department of Biochemistry, Showa University School of Medicine, Tokyo 142-8555, Japan
| | - Fukiko Sato
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Masahiro Bando
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Shusuke Yagi
- Department of Cardiovascular Medicine, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Takeshi Soeki
- Department of Cardiovascular Medicine, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Tetsuya Hayashi
- Laboratory of Cardiovascular Pharmacotherapy and Toxicology, Osaka University of Pharmaceutical Sciences, Osaka 569-1094, Japan
| | - Issei Imoto
- Department of Human Genetics, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Hiroshi Sakaue
- Department of Nutrition and Metabolism, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
| | - Michio Shimabukuro
- Department of Cardio-Diabetes Medicine, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
- Diabetes and Lifestyle-Related Disease Center, Tomishiro Central Hospital, Okinawa 901-0243, Japan
| | - Masataka Sata
- Department of Cardiovascular Medicine, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima 770-8503, Japan
- Corresponding author. E-mail: (D.F.); (M.S.)
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24
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Krogmann AO, Lüsebrink E, Steinmetz M, Asdonk T, Lahrmann C, Lütjohann D, Nickenig G, Zimmer S. Proinflammatory Stimulation of Toll-Like Receptor 9 with High Dose CpG ODN 1826 Impairs Endothelial Regeneration and Promotes Atherosclerosis in Mice. PLoS One 2016; 11:e0146326. [PMID: 26751387 PMCID: PMC4709087 DOI: 10.1371/journal.pone.0146326] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 12/16/2015] [Indexed: 12/11/2022] Open
Abstract
Background Toll-like receptors (TLR) of the innate immune system have been closely linked with the development of atherosclerotic lesions. TLR9 is activated by unmethylated CpG motifs within ssDNA, but also by CpG motifs in nucleic acids released during vascular apoptosis and necrosis. The role of TLR9 in vascular disease remains controversial and we sought to investigate the effects of a proinflammatory TLR9 stimulation in mice. Methods and Findings TLR9-stimulation with high dose CpG ODN at concentrations between 6.25nM to 30nM induced a significant proinflammatory cytokine response in mice. This was associated with impaired reendothelialization upon acute denudation of the carotid and increased numbers of circulating endothelial microparticles, as a marker for amplified endothelial damage. Chronic TLR9 agonism in apolipoprotein E-deficient (ApoE-/-) mice fed a cholesterol-rich diet increased aortic production of reactive oxygen species, the number of circulating endothelial microparticles, circulating sca-1/flk-1 positive cells, and most importantly augmented atherosclerotic plaque formation when compared to vehicle treated animals. Importantly, high concentrations of CpG ODN are required for these proatherogenic effects. Conclusions Systemic stimulation of TLR9 with high dose CpG ODN impaired reendothelialization upon acute vascular injury and increased atherosclerotic plaque development in ApoE-/- mice. Further studies are necessary to fully decipher the contradictory finding of TLR9 agonism in vascular biology.
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Affiliation(s)
- Alexander O. Krogmann
- Medizinische Klinik und Poliklinik II, Universitätsklinikum Bonn, 53105, Bonn, Germany
- * E-mail:
| | - Enzo Lüsebrink
- Medizinische Klinik und Poliklinik II, Universitätsklinikum Bonn, 53105, Bonn, Germany
| | - Martin Steinmetz
- Medizinische Klinik und Poliklinik II, Universitätsklinikum Bonn, 53105, Bonn, Germany
| | - Tobias Asdonk
- Medizinische Klinik und Poliklinik II, Universitätsklinikum Bonn, 53105, Bonn, Germany
| | - Catharina Lahrmann
- Medizinische Klinik und Poliklinik II, Universitätsklinikum Bonn, 53105, Bonn, Germany
| | - Dieter Lütjohann
- Institut für klinische Chemie und klinische Pharmakologie, Universität Bonn, 53125, Bonn, Germany
| | - Georg Nickenig
- Medizinische Klinik und Poliklinik II, Universitätsklinikum Bonn, 53105, Bonn, Germany
| | - Sebastian Zimmer
- Medizinische Klinik und Poliklinik II, Universitätsklinikum Bonn, 53105, Bonn, Germany
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Yang X, Yao H, Chen Y, Sun L, Li Y, Ma X, Duan S, Li X, Xiang R, Han J, Duan Y. Inhibition of Glutathione Production Induces Macrophage CD36 Expression and Enhances Cellular-oxidized Low Density Lipoprotein (oxLDL) Uptake. J Biol Chem 2015; 290:21788-99. [PMID: 26187465 DOI: 10.1074/jbc.m115.654582] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Indexed: 01/30/2023] Open
Abstract
The glutathione (GSH)-dependent antioxidant system has been demonstrated to inhibit atherosclerosis. Macrophage CD36 uptakes oxidized low density lipoprotein (oxLDL) thereby facilitating foam cell formation and development of atherosclerosis. It remains unknown if GSH can influence macrophage CD36 expression and cellular oxLDL uptake directly. Herein we report that treatment of macrophages with l-buthionine-S,R-sulfoximine (BSO) decreased cellular GSH production and ratios of GSH to glutathione disulfide (GSH/GSSG) while increasing production of reactive oxygen species. Associated with decreased GSH levels, macrophage CD36 expression was increased, which resulted in enhanced cellular oxLDL uptake. In contrast, N-acetyl cysteine and antioxidant enzyme (catalase or superoxide dismutase) blocked BSO-induced CD36 expression as well as oxLDL uptake. In vivo, administration of mice with BSO increased CD36 expression in peritoneal macrophages and kidneys. BSO had no effect on CD36 mRNA expression and promoter activity but still induced CD36 protein expression in macrophages lacking peroxisome proliferator-activated receptor γ expression, suggesting it induced CD36 expression at the translational level. Indeed, we determined that BSO enhanced CD36 translational efficiency. Taken together, our study demonstrates that cellular GSH levels and GSH/GSSG status can regulate macrophage CD36 expression and cellular oxLDL uptake and demonstrate an important anti-atherogenic function of the GSH-dependent antioxidant system by providing a novel molecular mechanism.
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Affiliation(s)
- Xiaoxiao Yang
- From the State Key Laboratory of Medicinal Chemical Biology, Colleges of Life Sciences and
| | - Hui Yao
- From the State Key Laboratory of Medicinal Chemical Biology, Colleges of Life Sciences and
| | - Yuanli Chen
- From the State Key Laboratory of Medicinal Chemical Biology, Medicine, Collaborative Innovation Center of Biotherapy, Nankai University, Tianjin 300071, China and
| | - Lei Sun
- Colleges of Life Sciences and
| | - Yan Li
- Colleges of Life Sciences and
| | | | - Shengzhong Duan
- Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | | | - Rong Xiang
- From the State Key Laboratory of Medicinal Chemical Biology, Medicine
| | - Jihong Han
- From the State Key Laboratory of Medicinal Chemical Biology, Colleges of Life Sciences and Collaborative Innovation Center of Biotherapy, Nankai University, Tianjin 300071, China and
| | - Yajun Duan
- From the State Key Laboratory of Medicinal Chemical Biology, Colleges of Life Sciences and
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Ilhan F, Kalkanli ST. Atherosclerosis and the role of immune cells. World J Clin Cases 2015; 3:345-352. [PMID: 25879006 PMCID: PMC4391004 DOI: 10.12998/wjcc.v3.i4.345] [Citation(s) in RCA: 89] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/13/2014] [Revised: 06/30/2014] [Accepted: 01/20/2015] [Indexed: 02/05/2023] Open
Abstract
Atherosclerosis is a chronic inflammatory disease arising from lipids, specifically low-density lipoproteins, and leukocytes. Following the activation of endothelium with the expression of adhesion molecules and monocytes, inflammatory cytokines from macrophages, and plasmacytoid dendritic cells, high levels of interferon (IFN)-α and β are generated upon the activation of toll-like receptor-9, and T-cells, especially the ones with Th1 profile, produce pro-inflammatory mediators such as IFN-γ and upregulate macrophages to adhere to the endothelium and migrate into the intima. This review presents an exhaustive account for the role of immune cells in the atherosclerosis.
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Bernard MA, Han X, Inderbitzin S, Agbim I, Zhao H, Koziel H, Tachado SD. HIV-derived ssRNA binds to TLR8 to induce inflammation-driven macrophage foam cell formation. PLoS One 2014; 9:e104039. [PMID: 25090652 PMCID: PMC4121254 DOI: 10.1371/journal.pone.0104039] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Accepted: 07/04/2014] [Indexed: 01/12/2023] Open
Abstract
Even though combined anti-retroviral therapy (cART) dramatically improves patient survival, they remain at a higher risk of being afflicted with non-infectious complications such as cardiovascular disease (CVD). This increased risk is linked to persistent inflammation and chronic immune activation. In this study, we assessed whether this complication is related to HIV-derived ssRNAs inducing in macrophages increases in TNFα release through TLR8 activation leading to foam cell formation. HIV ssRNAs induced foam cell formation in monocyte-derived macrophages (MDMs) in a dose-dependent manner. This response was reduced when either endocytosis or endosomal acidification was inhibited by dynasore or chloroquine, respectively. Using a flow cytometry FRET assay, we demonstrated that ssRNAs bind to TLR8 in HEK cells. In MDMs, ssRNAs triggered a TLR8-mediated inflammatory response that ultimately lead to foam cell formation. Targeted silencing of the TLR8 and MYD88 genes reduced foam cell formation. Furthermore, foam cell formation induced by these ssRNAs was blocked by an anti-TNFα neutralizing antibody. Taken together in MDMs, HIV ssRNAs are internalized; bind TLR8 in the endosome followed by endosomal acidification. TLR8 signaling then triggers TNFα release and ultimately leads to foam cell formation. As this response was inhibited by a blocking anti-TNFα antibody, drug targeting HIV ssRNA-driven TLR8 activation may serve as a potential therapeutic target to reduce chronic immune activation and inflammation leading to CVD in HIV+ patients.
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Affiliation(s)
- Mark A. Bernard
- Division of Pulmonary, Critical Care, and Sleep Medicine; Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Xinbing Han
- Division of Pulmonary, Critical Care, and Sleep Medicine; Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Sonya Inderbitzin
- Division of Pulmonary, Critical Care, and Sleep Medicine; Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Ifunanya Agbim
- Division of Pulmonary, Critical Care, and Sleep Medicine; Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Hui Zhao
- Division of Pulmonary, Critical Care, and Sleep Medicine; Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America
- From Department of Respiratory Medicine, The Second Hospital of Shanxi Medical University, Taiyuan, PR China
| | - Henry Koziel
- Division of Pulmonary, Critical Care, and Sleep Medicine; Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America
| | - Souvenir D. Tachado
- Division of Pulmonary, Critical Care, and Sleep Medicine; Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, Massachusetts, United States of America
- * E-mail:
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Shao L, Zhang P, Zhang Y, Ma A. Inflammatory unbalance of TLR3 and TLR4 in PCI patients with or without type 2 diabetes mellitus. Immunol Lett 2014; 161:81-8. [PMID: 24845156 DOI: 10.1016/j.imlet.2014.05.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 04/28/2014] [Accepted: 05/07/2014] [Indexed: 02/02/2023]
Abstract
BACKGROUND Toll-like receptors, the most characterized innate immune receptors, have recently been demonstrated to play an important role in coronary atherosclerotic disease and diabetes mellitus (DM). TLR3 and TLR4 are known to act as anti-inflammatory and pro-inflammatory factors respectively in multi-factorial inflammatory disease states. However, there is less research about TLR3 and TLR4 expression in percutaneous transluminal coronary intervention (PCI) patients, particularly those with type 2 diabetes mellitus (DM2). METHODS We examined TLR3 and TLR4 expression and their downstream signaling pathway in PCI patients with (n=31) or without (n=32) DM2 compared with controls (n=35). RESULTS TLR3 and downstream anti-inflammatory factors (IRF-3, INF-β and IL-10) were significantly down-regulated in PCI patients with or without DM2 compared with controls, as determined by the quantification of both mRNA and protein. In contrast, TLR4 and downstream proinflammatory factors (MyD88 and TNF-α) were up-regulated in PCI patients with or without DM2 compared with controls. CONCLUSIONS Patients undergoing PCI were shown to have a TLR-dependent pro-inflammatory state, mediated by a downregulation of TLR3 pathway, and upregulation of TLR4. This occurred in both with or without type 2 diabetes mellitus compared with controls in this research. The inflammatory imbalance observed in PCI patients was exacerbated in patients with DM2, consistent with a likely contribution of DM2 to the inflammatory state of coronary atherosclerotic disease, via impact on the innate immune response. This data supports the potential of TLRs as a novel therapeutic target in diabetics with coronary atherosclerotic disease.
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Affiliation(s)
- Liang Shao
- Department of Cardiovascular Medicine, the First Affiliated Hospital of Medical School, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China; Institute of Cardiovascular Channelopathy, Key Laboratory of Environment and Genes Related to Diseases (Xi'an Jiaotong University), Ministry of Education, Shaanxi Province, No. 277 Yanta West Road, Xi'an, Shaanxi 710061, PR China; Key Laboratory of Molecular Cardiology, Shaanxi Province, No. 277 Yanta West Road, Xi'an, Shaanxi 710061, PR China
| | - Ping Zhang
- Department of Neurology, Union Hospital of Huazhong University of Science and Technology, Wuhan 430022, Hubei Province, PR China
| | - Yong Zhang
- First Department of Cardiology, Shaanxi Provincial People's Hospital, Third Affiliated Hospital of Medical College of Xi'an Jiaotong University, No. 256 Friendship Road, Xi'an, Shaanxi 710061, PR China
| | - Aiqun Ma
- Department of Cardiovascular Medicine, the First Affiliated Hospital of Medical School, Xi'an Jiaotong University, Xi'an, Shaanxi 710061, China; Institute of Cardiovascular Channelopathy, Key Laboratory of Environment and Genes Related to Diseases (Xi'an Jiaotong University), Ministry of Education, Shaanxi Province, No. 277 Yanta West Road, Xi'an, Shaanxi 710061, PR China; Key Laboratory of Molecular Cardiology, Shaanxi Province, No. 277 Yanta West Road, Xi'an, Shaanxi 710061, PR China.
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Yamagata K, Tusruta C, Ohtuski A, Tagami M. Docosahexaenoic acid decreases TNF-α-induced lectin-like oxidized low-density lipoprotein receptor-1 expression in THP-1 cells. Prostaglandins Leukot Essent Fatty Acids 2014; 90:125-32. [PMID: 24518001 DOI: 10.1016/j.plefa.2013.12.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Revised: 12/25/2013] [Accepted: 12/31/2013] [Indexed: 11/18/2022]
Abstract
Docosahexaenoic acid (DHA) prevents atherosclerosis and may decrease monocyte/macrophage activation by tumor necrosis factor (TNF)-α. Here, we sought to determine the protective effects of DHA against TNF-α-induced stimulation of lectin-like oxidized low-density lipoprotein (LDL) receptor-1 (LOX-1) expression, which is associated with atherosclerosis. Using reverse transcription polymerase chain reaction, we found that TNF-α induced the expression of LOX-1 (OLR1), NADPH oxidase 2 (Nox2), p47phox (NCF1), very late antigen-4 (ITGA4), and lymphocyte function-associated antigen (ITGAL) genes. Additionally, DHA attenuated TNF-α-induced acetylated (Ac)-LDL uptake and reactive oxygen species (ROS) production, as measured using fluorescently labeled LDL and H2DCFDA, respectively, and reduced the expression levels of these genes. Moreover, the PI3 kinase inhibitor LY294002 blocked these effects of DHA. These results indicated that DHA inhibited several events associated with redox regulation in a PI3K-dependent manner, thereby mediating the expression of LOX-1 in monocytes/macrophages.
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Affiliation(s)
- Kazuo Yamagata
- Laboratory of Molecular Health Science of Food, Department of Food Bioscience and Biotechnology, College of Bioresourse Science, Nihon University (NUBS), Japan; Advance Research Center on Food Function, College of Bioresourse Science, Nihon University (NUBS), Japan.
| | - Chiaki Tusruta
- Laboratory of Molecular Health Science of Food, Department of Food Bioscience and Biotechnology, College of Bioresourse Science, Nihon University (NUBS), Japan
| | - Akane Ohtuski
- Laboratory of Molecular Health Science of Food, Department of Food Bioscience and Biotechnology, College of Bioresourse Science, Nihon University (NUBS), Japan
| | - Motoki Tagami
- Department of Internal Medicine, Sanraku Hospital, Chiyoda-Ku, Tokyo, Japan
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Giunzioni I, Bonomo A, Bishop E, Castiglioni S, Corsini A, Bellosta S. Cigarette smoke condensate affects monocyte interaction with endothelium. Atherosclerosis 2014; 234:383-90. [PMID: 24747113 DOI: 10.1016/j.atherosclerosis.2014.03.029] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Revised: 03/12/2014] [Accepted: 03/24/2014] [Indexed: 12/24/2022]
Abstract
OBJECTIVE Circulating monocytes adhere to the endothelium and migrate into the intima contributing to atherosclerotic plaque growth. Cigarette smoke is a risk factor for atherosclerosis, but it is not completely known how it affects monocyte behavior in atherogenesis. METHODS We studied the effects of cigarette smoke condensate (CSC) on human monocytes (HM) chemotaxis and transmigration through an endothelial cell (EC) monolayer. RESULTS Pre-treatment with CSC caused a decrease in HM chemotaxis and transmigration (-55% and -18% vs control, p < 0.05, respectively), paralleled by a reduced expression of Rac 1 GTPase. On the contrary, direct exposure of both HM and EC to CSC increased (+23% vs control, p < 0.05) HM transmigration, paralleled by a strong stimulation of VCAM1 and ICAM1 expression by ECs, and by a slight increase in monocyte integrin expression. An enhancement of monocyte transmigration was obtained after the exposure of both HM and EC to medium conditioned by HM previously incubated with CSC (+265% vs control, p < 0.001). CSC showed a stimulatory effect on the expression by HM of TLR4, MCP1, IL8, IL1beta, and TNFalfa, which was ablated by pre treatment with PDTC. Incubation with neutralizing antibodies against both MCP1 or IL8 completely abolished the CSC-conditioned medium induced HM transmigration. CONCLUSIONS CSC induces HM to release chemotactic factor(s), which amplify the recruitment and transmigration of inflammatory cells through EC, but CSC may also reduce HM migratory capacity. Therefore, exposure to CSC affects monocyte behavior and interaction with the endothelium, thus potentially facilitating and/or further aggravating the atherogenic process.
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Affiliation(s)
- I Giunzioni
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, via Balzaretti 9, 20133 Milan, Italy
| | - A Bonomo
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, via Balzaretti 9, 20133 Milan, Italy
| | - E Bishop
- British American Tobacco Group Research & Development, Southampton, UK
| | - S Castiglioni
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, via Balzaretti 9, 20133 Milan, Italy
| | - A Corsini
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, via Balzaretti 9, 20133 Milan, Italy
| | - S Bellosta
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, via Balzaretti 9, 20133 Milan, Italy.
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31
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Gray SP, Jha JC, Di Marco E, Jandeleit-Dahm KA. NAD(P)H oxidase isoforms as therapeutic targets for diabetic complications. Expert Rev Endocrinol Metab 2014; 9:111-122. [PMID: 30743754 DOI: 10.1586/17446651.2014.887984] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The development of macro- and microvascular complications is accelerated in diabetic patients. While some therapeutic regimes have helped in delaying progression of complications, none have yet been able to halt the progression and prevent vascular disease, highlighting the need to identify new therapeutic targets. Increased oxidative stress derived from the NADPH oxidase (Nox) family has recently been identified to play an important role in the pathophysiology of vascular disease. In recent years, specific Nox isoforms have been implicated in contributing to the development of atherosclerosis of major vessels, as well as damage of the small vessels within the kidney and the eye. With the use of novel Nox inhibitors, it has been demonstrated that these complications can be attenuated, indicating that targeting Nox derived oxidative stress holds potential as a new therapeutic strategy.
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Affiliation(s)
| | - Jay C Jha
- a Diabetic Complications Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia
| | - Elyse Di Marco
- a Diabetic Complications Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia
| | - Karin Am Jandeleit-Dahm
- a Diabetic Complications Division, Baker IDI Heart and Diabetes Institute, Melbourne, Victoria, Australia
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Cole JE, Mitra AT, Monaco C. Treating atherosclerosis: the potential of Toll-like receptors as therapeutic targets. Expert Rev Cardiovasc Ther 2014; 8:1619-35. [DOI: 10.1586/erc.10.149] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Oxidized low-density lipoprotein-induced foam cell formation is mediated by formyl peptide receptor 2. Biochem Biophys Res Commun 2013; 443:1003-7. [PMID: 24361884 DOI: 10.1016/j.bbrc.2013.12.082] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2013] [Accepted: 12/16/2013] [Indexed: 11/24/2022]
Abstract
The increased level of LDL and its modification into oxLDL has been regarded as an important risk factor for the development of cardiovascular diseases such as atherosclerosis. Although some scavenger receptors including CD36 and RAGE have been considered as target receptors for oxLDL, involvement of other receptors should be investigated for oxLDL-induced pathological responses. In this study, we found that oxLDL-induced foam cell formation was inhibited by formyl peptide receptor 2 (FPR2) antagonist WRW(4). oxLDL also stimulated calcium signaling and chemotactic migration in FPR2-expressing RBL-2H3 cells but not in vector-expressing RBL-2H3 cells. Moreover, oxLDL stimulated TNF-α production, which was also almost completely inhibited by FPR2 antagonist. Our findings therefore suggest that oxLDL stimulates macrophages, resulting in chemotactic migration, TNF-α production, and foam cell formation via FPR2 signaling, and thus likely contributes to atherogenesis.
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Shao L, Zhang P, Zhang Y, Lu Q, Ma A. TLR3 and TLR4 as potential clinically biomarkers of cardiovascular risk in coronary artery disease (CAD) patients. Heart Vessels 2013; 29:690-8. [PMID: 24146036 DOI: 10.1007/s00380-013-0421-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Accepted: 09/27/2013] [Indexed: 11/26/2022]
Abstract
Coronary artery disease (CAD), as a lipid-driven and inflammation-driven disease, has threatened thousands of patients' lives. Toll-like receptors, the most characterized innate immune receptors, have recently been demonstrated to play a key role in coronary artery disease, particularly Toll-like receptor (TLR) 3 and TLR4. We examined TLR3, TLR4, and associated inflammatory factors expression in monocytes and their signaling pathway proteins in patients with varying degrees of coronary artery atherosclerosis [group S (single diseased vessel), n = 36; group D (double diseased vessels), n = 36; group T (three diseased vessels), n = 33 compared with controls (n = 35)]. In mononuclear cells, TLR3 mRNA and protein, and IRF-3 were significantly down-regulated as the coronary arteries stenosis number increased. However, TLR4 mRNA and protein, and MyD88 were significantly increased in patients with coronary artery stenosis compared with controls, and were associated with the number of stenoses. In serum, there was significant up-regulation in TNF-α, IL-8, and MCP-1 and obvious down-regulation in INF-β and IP-10 with severity of CAD. This study demonstrates differential expression of TLR3 and TLR4 at both the mRNA and protein level in both mononuclear cells and downstream serum readouts of patients with CAD compared with the control. The expression of TLR4 and TLR3 closely correlated with the severity of coronary artery disease as reflected by the number of coronary artery stenoses. TLR3 and TLR4 have the potential to be a clinically useful biomarker of cardiovascular risk.
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Affiliation(s)
- Liang Shao
- Department of Cardiovascular Medicine, First Affiliated Hospital of Medical College of Xi'an Jiaotong University, No. 277 Yanta West Road, Xi'an, 710061, Shaanxi, People's Republic of China,
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35
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Lin YT, Verma A, Hodgkinson CP. Toll-like receptors and human disease: lessons from single nucleotide polymorphisms. Curr Genomics 2013; 13:633-45. [PMID: 23730203 PMCID: PMC3492803 DOI: 10.2174/138920212803759712] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2012] [Revised: 10/08/2012] [Accepted: 10/08/2012] [Indexed: 12/13/2022] Open
Abstract
Toll-like receptors (TLRs), a large group of proteins which recognize various pathogen-associated molecular patterns, are critical for the normal function of the innate immune system. Following their discovery many single nucleotide polymorphisms within TLRs and components of their signaling machinery have been discovered and subsequently implicated in a wide range of human diseases including atherosclerosis, sepsis, asthma, and immunodeficiency. This review discusses the effect of genetic variation on TLR function and how they may precipitate disease.
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Affiliation(s)
- Yi-Tzu Lin
- Department of Medicine, Duke University Medical Center & Mandel Center for Hypertension and Atherosclerosis Research, Durham, NC 27710, USA
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36
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Lee HY, Kim SD, Baek SH, Choi JH, Bae YS. Role of formyl peptide receptor 2 on the serum amyloid A-induced macrophage foam cell formation. Biochem Biophys Res Commun 2013; 433:255-9. [DOI: 10.1016/j.bbrc.2013.03.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2013] [Accepted: 03/01/2013] [Indexed: 02/04/2023]
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Abstract
Atherosclerosis underlies coronary artery disease (CAD) and cerebrovascular disease, which are the most common forms of life-threatening cardiovascular disorders. To minimize the risk of atherosclerotic complications, primary and secondary prevention strategies seek to control risk factors. Reducing low-density lipoprotein (LDL) cholesterol through lipid-lowering drugs, such as statins, in particular yields a proportional decrease in cardiovascular disease risk. Atherosclerosis is considered to be a complex chronic inflammatory process triggered by cardiovascular risk factors which cause endothelial dysfunction and inflammatory cell infiltration within the artery wall. In this review, we summarize the current understanding of the underling molecular mechanisms of the immune signals in the development and progression of atherosclerosis. Among various molecular mechanisms, toll like receptors (TLRs) are potent proinflammatory cytokines that operate to induce inflammation play an important role in the pathogenesis of atherosclerosis. Moreover, we discuss current knowledge regarding monocyte/macrophage biology that contributes to the progression of atherosclerosis, including macrophage polarization and heterogeneity. Understanding the molecular mechanisms in conjunction with orchestration of monocyte/macrophage biology should provide a basis for novel treatment strategies to prevent the development and progression of atherosclerosis.
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Affiliation(s)
- Hiroshi Iwata
- Brigham and Women's Hospital, Department of Medicine, Cardiovascular Division, Center for Interdisciplinary Cardiovascular Sciences, 3 Blackfan Street, 17th Floor, Boston, MA 02115, USA.
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Moghimpour Bijani F, Vallejo JG, Rezaei N. Toll-like receptor signaling pathways in cardiovascular diseases: challenges and opportunities. Int Rev Immunol 2013; 31:379-95. [PMID: 23083347 DOI: 10.3109/08830185.2012.706761] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Toll-like receptors (TLRs), a family of surface molecules, are involved in innate immune responses. Recent studies indicated that TLRs play a critical role in inflammatory responses to exogenous and endogenous triggers. This article focuses on probable effects of TLRs in the morbidity of cardiovascular events, e.g., ischemic reperfusion (I/R) injury and atherosclerosis. TLR2 and TLR4 have been shown to have the most fundamental role in promoting cytokine production and subsequent inflammatory damages in these states. Blockade of these receptors may be beneficial in both preventing the occurrence and decreasing the complications in cardiovascular events. However, controversies exist on the certainty of this beneficial effect; therefore, additional studies are needed.
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Affiliation(s)
- Faezeh Moghimpour Bijani
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
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Lee HY, Kim SD, Baek SH, Choi JH, Cho KH, Zabel BA, Bae YS. Serum amyloid A stimulates macrophage foam cell formation via lectin-like oxidized low-density lipoprotein receptor 1 upregulation. Biochem Biophys Res Commun 2013; 433:18-23. [PMID: 23454129 DOI: 10.1016/j.bbrc.2013.02.077] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Accepted: 02/14/2013] [Indexed: 12/30/2022]
Abstract
Elevated levels of serum amyloid A (SAA) is a risk factor for cardiovascular diseases, however, the role of SAA in the pathophysiology of atherosclerosis remains unclear. Here we show that SAA induced macrophage foam cell formation. SAA-stimulated foam cell formation was mediated by c-jun N-terminal kinase (JNK) signaling. Moreover, both SAA and SAA-conjugated high density lipoprotein stimulated the expression of the important scavenger receptor lectin-like oxidized low-density lipoprotein receptor 1 (LOX1) via nuclear factor-κB (NF-κB). A LOX1 antagonist carrageenan significantly blocked SAA-induced foam cell formation, indicating that SAA promotes foam cell formation via LOX1 expression. Our findings therefore suggest that SAA stimulates foam cell formation via LOX1 induction, and thus likely contributes to atherogenesis.
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Affiliation(s)
- Ha Young Lee
- Department of Biological Science, Sungkyunkwan University, Suwon 440-746, South Korea.
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40
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Park DW, Lee HK, Lyu JH, Chin H, Kang SW, Kim YJ, Bae YS, Baek SH. TLR2 stimulates ABCA1 expression via PKC-η and PLD2 pathway. Biochem Biophys Res Commun 2013; 430:933-7. [DOI: 10.1016/j.bbrc.2012.11.135] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Accepted: 11/28/2012] [Indexed: 11/26/2022]
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Stanic B, Pandey D, Fulton DJ, Miller FJ. Increased epidermal growth factor-like ligands are associated with elevated vascular nicotinamide adenine dinucleotide phosphate oxidase in a primate model of atherosclerosis. Arterioscler Thromb Vasc Biol 2012; 32:2452-60. [PMID: 22879585 DOI: 10.1161/atvbaha.112.256107] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVE To characterize the relationship between the expression of epidermal growth factor (EGF)-like ligands and vascular nicotinamide adenine dinucleotide phosphate (NADPH) oxidase expression and activity in a primate model of atherosclerosis. METHODS AND RESULTS Adult male Cynomolgus monkeys were fed a normal or atherogenic (AS) diet for 45 months, after which animals from the AS group were placed on a normal diet for 8 months (regression). The expression of membrane-associated EGF-like ligands was increased in arteries from animals on the AS diet and normalized in the regression group. EGF-like ligands were distributed throughout atherosclerotic vessels but predominantly colocalized with macrophages. Consistent with ligand shedding, circulating heparin-bound EGF was elevated in the plasma of AS monkeys but not in those on regression diet. Atherosclerosis was associated with the activation of EGF receptor signaling. Expression of NADPH oxidase subunits Nox1 and Nox2 but not Nox4 or Nox5 was increased in arteries from monkeys on the AS diet and returned to normal with regression. Levels of Nox1 and Nox2 positively correlated with EGF-like ligands. In cultured monkey smooth muscle cells, treatment with EGF-like ligands increased Nox1 expression and activity. CONCLUSIONS These data identify EGF-like ligands as potential modulators of atherogenesis, resulting in part from increased vascular NADPH oxidase activity.
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Affiliation(s)
- Bojana Stanic
- Department of Internal Medicine The University of Iowa, Iowa City, IA 52242, USA
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Karper JC, Ewing MM, Habets KLL, de Vries MR, Peters EAB, van Oeveren-Rietdijk AM, de Boer HC, Hamming JF, Kuiper J, Kandimalla ER, La Monica N, Jukema JW, Quax PHA. Blocking toll-like receptors 7 and 9 reduces postinterventional remodeling via reduced macrophage activation, foam cell formation, and migration. Arterioscler Thromb Vasc Biol 2012; 32:e72-80. [PMID: 22628437 DOI: 10.1161/atvbaha.112.249391] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
OBJECTIVE The role of toll-like receptors (TLRs) in vascular remodeling is well established. However, the involvement of the endosomal TLRs is unknown. Here, we study the effect of combined blocking of TLR7 and TLR9 on postinterventional remodeling and accelerated atherosclerosis. METHODS AND RESULTS In hypercholesterolemic apolipoprotein E*3-Leiden mice, femoral artery cuff placement led to strong increase of TLR7 and TLR9 presence demonstrated by immunohistochemistry. Blocking TLR7/9 with a dual antagonist in vivo reduced neointimal thickening and foam cell accumulation 14 days after surgery by 65.6% (P=0.0079). Intima/media ratio was reduced by 64.5% and luminal stenosis by 62.8%. The TLR7/9 antagonist reduced the arterial wall inflammation, with reduced macrophage infiltration, decreased cytoplasmic high-mobility group box 1 expression, and altered serum interleukin-10 levels. Stimulation of cultured macrophages with TLR7 and TLR9 ligands enhanced tumor necrosis factor-α expression, which is decreased by TLR7/9 antagonist coadministration. Additionally, the antagonist abolished the TLR7/9-enhanced low-density lipoprotein uptake. The antagonist also reduced oxidized low-density lipoprotein-induced foam cell formation, most likely not via decreased influx but via increased efflux, because CD36 expression was unchanged whereas interleukin-10 levels were higher (36.1 ± 22.3 pg/mL versus 128.9 ± 6.6 pg/mL; P=0.008). CONCLUSIONS Blocking TLR7 and TLR9 reduced postinterventional vascular remodeling and foam cell accumulation indicating TLR7 and TLR9 as novel therapeutic targets.
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Affiliation(s)
- Jacco C Karper
- Einthoven Laboratory of Vascular Medicine, Department of Surgery, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, the Netherlands
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Lassègue B, San Martín A, Griendling KK. Biochemistry, physiology, and pathophysiology of NADPH oxidases in the cardiovascular system. Circ Res 2012; 110:1364-90. [PMID: 22581922 PMCID: PMC3365576 DOI: 10.1161/circresaha.111.243972] [Citation(s) in RCA: 610] [Impact Index Per Article: 50.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Accepted: 03/09/2012] [Indexed: 02/07/2023]
Abstract
The NADPH oxidase (Nox) enzymes are critical mediators of cardiovascular physiology and pathophysiology. These proteins are expressed in virtually all cardiovascular cells, and regulate such diverse functions as differentiation, proliferation, apoptosis, senescence, inflammatory responses and oxygen sensing. They target a number of important signaling molecules, including kinases, phosphatases, transcription factors, ion channels, and proteins that regulate the cytoskeleton. Nox enzymes have been implicated in many different cardiovascular pathologies: atherosclerosis, hypertension, cardiac hypertrophy and remodeling, angiogenesis and collateral formation, stroke, and heart failure. In this review, we discuss in detail the biochemistry of Nox enzymes expressed in the cardiovascular system (Nox1, 2, 4, and 5), their roles in cardiovascular cell biology, and their contributions to disease development.
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Affiliation(s)
- Bernard Lassègue
- Division of Cardiology, Department of Medicine, Emory University, Atlanta, GA 30322, USA
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Leow KY, Goh WWB, Heng CK. Effect of serum amyloid A1 treatment on global gene expression in THP-1-derived macrophages. Inflamm Res 2012; 61:391-8. [PMID: 22228103 DOI: 10.1007/s00011-011-0424-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2011] [Revised: 11/29/2011] [Accepted: 12/19/2011] [Indexed: 12/14/2022] Open
Abstract
OBJECTIVE To investigate the effect of serum amyloid A1 (SAA1) on global gene expression in macrophages derived from THP-1 monocytes. MATERIALS AND METHODS Global genetic expression in THP-1-derived macrophages was determined using Illumina HT-12 microarray chips and the results were validated by real-time PCR. Cytokine levels in cellular supernatant were quantified by ELISA. RESULTS In total, 55 genes were upregulated with fold difference greater than two when THP-1-derived macrophages were incubated with SAA1 for 8 h. SAA1 is a strong cytokine inducer with significant upregulation of chemokines CCL1, CCL3, and CCL4 and this was confirmed by both real-time PCR and ELISA quantification. SAA1 also promotes the upregulation of genes involved in phagocytosis, anti-apoptosis, and tissue remodeling. CONCLUSIONS SAA1 appears to play an important role during the immune response and in chronic inflammatory diseases through the stimulation of genes involved in cytokine production, phagocytosis, and anti-apoptosis.
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Affiliation(s)
- Koon-Yeow Leow
- Department of Paediatrics, Yong Loo Lin School of Medicine, National University of Singapore, 1E, Kent Ridge Road, Singapore 119228, Singapore
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Seneviratne AN, Sivagurunathan B, Monaco C. Toll-like receptors and macrophage activation in atherosclerosis. Clin Chim Acta 2011; 413:3-14. [PMID: 21884686 DOI: 10.1016/j.cca.2011.08.021] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Revised: 07/29/2011] [Accepted: 08/12/2011] [Indexed: 12/29/2022]
Abstract
Atherosclerosis is a multi-factorial inflammatory disease and is the primary initiator of coronary artery and cerebrovascular disease. Initially believed to be exclusively lipid-driven, recent evidence demonstrates that inflammation is a significant driving force of the disease. Cellular components of innate immunity, for example monocytes and macrophages, play a predominant role in atherosclerosis. Toll-like receptors (TLRs) are the most characterised innate immune receptors and recent evidence demonstrates an important role in atherogenesis. Engagement of TLRs results in the transcription of pro-inflammatory cytokines, foam cell formation and activation of adaptive immunity. Recently they have also been implicated in protection from vascular disease. In this review, we detail the role of the innate immune system, specifically macrophages and TLR signalling, in atherosclerosis and acute cardiovascular complications, and thereby identify the potential of TLRs to act as therapeutic targets.
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Affiliation(s)
- Anusha N Seneviratne
- Kennedy Institute of Rheumatology, Faculty of Medicine, Imperial College, London, United Kingdom
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Lee H, Bae S, Choi BW, Yoon Y. WNT/β-catenin pathway is modulated in asthma patients and LPS-stimulated RAW264.7 macrophage cell line. Immunopharmacol Immunotoxicol 2011; 34:56-65. [PMID: 21699440 DOI: 10.3109/08923973.2011.574704] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In the present study, we investigated the possibility that the WNT/β-catenin pathway plays a role in inflammatory responses both in an human inflammatory condition and in an in vitro inflammation model. First, we analyzed gene expression patterns of the peripheral blood cells from asthma patients compared with those from normal subjects using microarray analyses. We found that intracellular signaling molecules of the WNT/β-catenin pathway were significantly changed in asthma patients compared with the levels in the controls. Next, we determined whether major components of the WNT/β-catenin pathway were involved in the lipopolysaccharide (LPS)-induced inflammatory response of the RAW264.7 macrophage cell line. Among the members of WNT/β-catenin pathway, the protein levels of low-density lipoprotein receptor-related protein (LRP) 6, dishevelled (DVL) 2, and AXIN1, which were measured using western blotting, did not significantly change in the presence of LPS. In contrast, the LPS induced a rapid phosphorylation of glycogen synthase kinase (GSK) 3β and accumulation of β-catenin protein. It was found that β-catenin plays a significant role in the LPS-induced inflammatory response through the performance of small interfering RNA (siRNA) transfection experiments. The mRNA level of IL-6 was significantly elevated in β-catenin siRNA-transfected cells compared with that in control siRNA-transfected cells after LPS treatment. Furthermore, nuclear factor-κB (NF-κB) activity was also significantly increased in β-catenin siRNA-transfected cells compared with the level seen in control siRNA-transfected cells. Taken together, these results suggest that β-catenin plays a role as a negative regulator, preventing the overproduction of inflammatory cytokines such as IL-6 in LPS-induced inflammatory responses.
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Affiliation(s)
- Haeyong Lee
- Department of Microbiology, Chung-Ang University College of Medicine, Seoul, Republic of Korea
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Monaco C, Terrando N, Midwood KS. Toll-like receptor signaling: common pathways that drive cardiovascular disease and rheumatoid arthritis. Arthritis Care Res (Hoboken) 2011; 63:500-11. [PMID: 21452263 DOI: 10.1002/acr.20382] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Claudia Monaco
- Kennedy Institute of Rheumatology, Imperial College, London, UK.
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Shalhoub J, Falck-Hansen MA, Davies AH, Monaco C. Innate immunity and monocyte-macrophage activation in atherosclerosis. JOURNAL OF INFLAMMATION-LONDON 2011; 8:9. [PMID: 21526997 PMCID: PMC3094203 DOI: 10.1186/1476-9255-8-9] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2010] [Accepted: 04/28/2011] [Indexed: 12/25/2022]
Abstract
Innate inflammation is a hallmark of both experimental and human atherosclerosis. The predominant innate immune cell in the atherosclerotic plaque is the monocyte-macrophage. The behaviour of this cell type within the plaque is heterogeneous and depends on the recruitment of diverse monocyte subsets. Furthermore, the plaque microenvironment offers polarisation and activation signals which impact on phenotype. Microenvironmental signals are sensed through pattern recognition receptors, including toll-like and NOD-like receptors - the latter of which are components of the inflammasome - thus dictating macrophage behaviour and outcome in atherosclerosis. Recently cholesterol crystals and modified lipoproteins have been recognised as able to directly engage these pattern recognition receptors. The convergent role of such pathways in terms of macrophage activation is discussed in this review.
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Affiliation(s)
- Joseph Shalhoub
- Cytokine Biology of Atherosclerosis, Kennedy Institute of Rheumatology, Faculty of Medicine, Imperial College London, UK.
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NADPH oxidase-derived reactive oxygen species: involvement in vascular physiology and pathology. Cell Tissue Res 2010; 342:325-39. [PMID: 21052718 DOI: 10.1007/s00441-010-1060-y] [Citation(s) in RCA: 117] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2010] [Accepted: 09/13/2010] [Indexed: 02/06/2023]
Abstract
Reactive oxygen species (ROS) are essential mediators of normal cell physiology. However, in the last few decades, it has become evident that ROS overproduction and/or alterations of the antioxidant system associated with inflammation and metabolic dysfunction are key pathological triggers of cardiovascular disorders. NADPH oxidases (Nox) represent a class of hetero-oligomeric enzymes whose primary function is the generation of ROS. In the vasculature, Nox-derived ROS contribute to the maintenance of vascular tone and regulate important processes such as cell growth, proliferation, differentiation, apoptosis, cytoskeletal organization, and cell migration. Under pathological conditions, excessive Nox-dependent ROS formation, which is generally associated with the up-regulation of different Nox subtypes, induces dysregulation of the redox control systems and promotes oxidative injury of the cardiovascular cells. The molecular mechanism of Nox-derived ROS generation and the means by which this class of molecule contributes to vascular damage remain debatable issues. This review focuses on the processes of ROS formation, molecular targets, and neutralization in the vasculature and provides an overview of the novel concepts regarding Nox functions, expression, and regulation in vascular health and disease. Because Nox enzymes are the most important sources of ROS in the vasculature, therapeutic perspectives to counteract Nox-dependent oxidative stress in the cardiovascular system are discussed.
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Gu JQ, Wang DF, Yan XG, Zhong WL, Zhang J, Fan B, Ikuyama S. A Toll-like receptor 9-mediated pathway stimulates perilipin 3 (TIP47) expression and induces lipid accumulation in macrophages. Am J Physiol Endocrinol Metab 2010; 299:E593-600. [PMID: 20628022 DOI: 10.1152/ajpendo.00159.2010] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Excessive accumulation of lipids in macrophages results in formation of foam cells and is a hallmark of atherosclerosis. The PAT family of proteins has been implicated in this process, but details of their involvement in foam cell formation have not been fully elucidated. One of dominant members of the PAT proteins, perilipin 3 (TIP47), is likely to be involved in such a regulatory mechanism. In this study, we demonstrated that the Toll-like receptor 9 (TLR9)-mediated pathway stimulates perilipin 3 expression and accumulation of lipids, especially triglycerides, in macrophages. Oligodeoxynucleotide (ODN) 1826, a ligand of TLR9, significantly enhanced perilipin 3 expression in RAW264.7 cells, and chloroquine, a TLR9 inhibitor, almost completely inhibited ODN1826-induced perilipin 3 expression. The inhibitors of c-jun NH2-terminal kinase and PI 3-kinase suppressed the level of perilipin 3 mRNA induced by ODN1826. ODN1826 induced the expression of IL-1α and IFNβ, both of which increased perilipin 3 expression. Antibodies against these cytokines suppressed the ODN1826-induced perilipin 3 mRNA levels. These results suggest that the expression of perilipin 3 in macrophages is in part regulated through the TLR9-mediated mechanism. Furthermore, ODN1826 increased intracellular lipid accumulation in the presence of oxLDL, which was reduced by perilipin 3 siRNA. Perilipin 3 expression was not stimulated by oxLDL. Depletion of perilipin 3 by siRNA specifically reduced triglyceride content in the cells but not cholesterol content, indicating that perilipin 3 is involved mainly in triglyceride accumulation. In conclusion, the TLR9-mediated pathway facilitates foam cell formation in part through increased expression of perilipin 3.
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Affiliation(s)
- Jian-Qiu Gu
- Dept. of Endocrinology and Metabolism, The First Affiliated Hospital of China Medical University, No. 155, North Nanjing St., Heping District, Shenyang 110001, China.
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