1
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Rani A, Stadler JT, Marsche G. HDL-based therapeutics: A promising frontier in combating viral and bacterial infections. Pharmacol Ther 2024; 260:108684. [PMID: 38964560 DOI: 10.1016/j.pharmthera.2024.108684] [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: 02/26/2024] [Revised: 06/03/2024] [Accepted: 07/01/2024] [Indexed: 07/06/2024]
Abstract
Low levels of high-density lipoprotein (HDL) and impaired HDL functionality have been consistently associated with increased susceptibility to infection and its serious consequences. This has been attributed to the critical role of HDL in maintaining cellular lipid homeostasis, which is essential for the proper functioning of immune and structural cells. HDL, a multifunctional particle, exerts pleiotropic effects in host defense against pathogens. It functions as a natural nanoparticle, capable of sequestering and neutralizing potentially harmful substances like bacterial lipopolysaccharides. HDL possesses antiviral activity, preventing viruses from entering or fusing with host cells, thereby halting their replication cycle. Understanding the complex relationship between HDL and the immune system may reveal innovative targets for developing new treatments to combat infectious diseases and improve patient outcomes. This review aims to emphasize the role of HDL in influencing the course of bacterial and viral infections and its and its therapeutic potential.
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Affiliation(s)
- Alankrita Rani
- Division of Pharmacology, Otto Loewi Research Center, Medical University of Graz, Neue Stiftingtalstrasse 6, 8010 Graz, Styria, Austria
| | - Julia T Stadler
- Division of Pharmacology, Otto Loewi Research Center, Medical University of Graz, Neue Stiftingtalstrasse 6, 8010 Graz, Styria, Austria
| | - Gunther Marsche
- Division of Pharmacology, Otto Loewi Research Center, Medical University of Graz, Neue Stiftingtalstrasse 6, 8010 Graz, Styria, Austria; BioTechMed-Graz, Mozartgasse 12/II, 8010 Graz, Styria, Austria.
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2
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Lodge S, Litton E, Gray N, Ryan M, Millet O, Fear M, Raby E, Currie A, Wood F, Holmes E, Wist J, Nicholson JK. Stratification of Sepsis Patients on Admission into the Intensive Care Unit According to Differential Plasma Metabolic Phenotypes. J Proteome Res 2024; 23:1328-1340. [PMID: 38513133 PMCID: PMC11002934 DOI: 10.1021/acs.jproteome.3c00803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 02/15/2024] [Accepted: 03/07/2024] [Indexed: 03/23/2024]
Abstract
Delayed diagnosis of patients with sepsis or septic shock is associated with increased mortality and morbidity. UPLC-MS and NMR spectroscopy were used to measure panels of lipoproteins, lipids, biogenic amines, amino acids, and tryptophan pathway metabolites in blood plasma samples collected from 152 patients within 48 h of admission into the Intensive Care Unit (ICU) where 62 patients had no sepsis, 71 patients had sepsis, and 19 patients had septic shock. Patients with sepsis or septic shock had higher concentrations of neopterin and lower levels of HDL cholesterol and phospholipid particles in comparison to nonsepsis patients. Septic shock could be differentiated from sepsis patients based on different concentrations of 10 lipids, including significantly lower concentrations of five phosphatidylcholine species, three cholesterol esters, one dihydroceramide, and one phosphatidylethanolamine. The Supramolecular Phospholipid Composite (SPC) was reduced in all ICU patients, while the composite markers of acute phase glycoproteins were increased in the sepsis and septic shock patients within 48 h admission into ICU. We show that the plasma metabolic phenotype obtained within 48 h of ICU admission is diagnostic for the presence of sepsis and that septic shock can be differentiated from sepsis based on the lipid profile.
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Affiliation(s)
- Samantha Lodge
- Australian
National Phenome Center, Health Futures Institute, Murdoch University, Harry Perkins Building, Perth, WA6150, Australia
- Center
for Computational and Systems Medicine, Health Futures Institute, Murdoch University, Harry Perkins Building, Perth, WA 6150, Australia
| | - Edward Litton
- Intensive
Care Unit, Fiona Stanley Hospital, Murdoch, WA 6150, Australia
- Intensive
Care Unit, St John of God Hospital, Subiaco, WA 6009, Australia
- School
of Medicine, University of Western Australia, Crawley, WA 6009, Australia
| | - Nicola Gray
- Australian
National Phenome Center, Health Futures Institute, Murdoch University, Harry Perkins Building, Perth, WA6150, Australia
- Center
for Computational and Systems Medicine, Health Futures Institute, Murdoch University, Harry Perkins Building, Perth, WA 6150, Australia
| | - Monique Ryan
- Australian
National Phenome Center, Health Futures Institute, Murdoch University, Harry Perkins Building, Perth, WA6150, Australia
- Center
for Computational and Systems Medicine, Health Futures Institute, Murdoch University, Harry Perkins Building, Perth, WA 6150, Australia
| | - Oscar Millet
- Precision
Medicine and Metabolism Laboratory, CIC
bioGUNE, Parque Tecnológico
de Bizkaia, Bld. 800, Derio 48160, Spain
| | - Mark Fear
- Burn
Injury Research Unit, School of Biomedical Sciences, University of Western Australia, Perth, WA 6009, Australia
- Fiona
Wood Foundation, Perth, WA 6150, Australia
| | - Edward Raby
- Department
of Infectious Diseases, Fiona Stanley Hospital, Murdoch, WA 6150, Australia
| | - Andrew Currie
- School
of Medical, Molecular & Forensic Sciences, Murdoch University, Perth, WA 6150, Australia
- Centre
for Molecular Medicine & Innovative Therapeutics, Murdoch University, Perth, WA 6150, Australia
- Wesfarmers
Centre for Vaccines and Infectious Diseases, Telethon Kids Institute, University of Western Australia, Perth, WA 6009, Australia
| | - Fiona Wood
- Burn
Injury Research Unit, School of Biomedical Sciences, University of Western Australia, Perth, WA 6009, Australia
- Fiona
Wood Foundation, Perth, WA 6150, Australia
- Burns
service of Western Australia, WA Department
of Health, Murdoch, WA 6150, Australia
| | - Elaine Holmes
- Center
for Computational and Systems Medicine, Health Futures Institute, Murdoch University, Harry Perkins Building, Perth, WA 6150, Australia
- Institute
of Global Health Innovation, Faculty of Medicine, Imperial College London, Level 1, Faculty Building, South Kensington Campus, London SW7 2NA, U.K.
| | - Julien Wist
- Australian
National Phenome Center, Health Futures Institute, Murdoch University, Harry Perkins Building, Perth, WA6150, Australia
- Center
for Computational and Systems Medicine, Health Futures Institute, Murdoch University, Harry Perkins Building, Perth, WA 6150, Australia
- Chemistry
Department, Universidad del Valle, Cali 76001, Colombia
- Department of Metabolism, Digestion and
Reproduction, Faculty of Medicine, Imperial
College London, Sir Alexander
Fleming Building, South Kensington, London SW7 2AZ, U.K.
| | - Jeremy K. Nicholson
- Australian
National Phenome Center, Health Futures Institute, Murdoch University, Harry Perkins Building, Perth, WA6150, Australia
- Department of Metabolism, Digestion and
Reproduction, Faculty of Medicine, Imperial
College London, Sir Alexander
Fleming Building, South Kensington, London SW7 2AZ, U.K.
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3
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Wang Y, Fan Y, Jiang Y, Wang E, Song Y, Chen H, Xu F, Xie K, Yu Y. APOA2: New Target for Molecular Hydrogen Therapy in Sepsis-Related Lung Injury Based on Proteomic and Genomic Analysis. Int J Mol Sci 2023; 24:11325. [PMID: 37511084 PMCID: PMC10379236 DOI: 10.3390/ijms241411325] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 06/30/2023] [Accepted: 07/03/2023] [Indexed: 07/30/2023] Open
Abstract
Target biomarkers for H2 at both the protein and genome levels are still unclear. In this study, quantitative proteomics acquired from a mouse model were first analyzed. At the same time, functional pathway analysis helped identify functional pathways at the protein level. Then, bioinformatics on mRNA sequencing data were conducted between sepsis and normal mouse models. Differential expressional genes with the closest relationship to disease status and development were identified through module correlation analysis. Then, common biomarkers in proteomics and transcriptomics were extracted as target biomarkers. Through analyzing expression quantitative trait locus (eQTL) and genome-wide association studies (GWAS), colocalization analysis on Apoa2 and sepsis phenotype was conducted by summary-data-based Mendelian randomization (SMR). Then, two-sample and drug-target, syndrome Mendelian randomization (MR) analyses were all conducted using the Twosample R package. For protein level, protein quantitative trait loci (pQTLs) of the target biomarker were also included in MR. Animal experiments helped validate these results. As a result, Apoa2 protein or mRNA was identified as a target biomarker for H2 with a protective, causal relationship with sepsis. HDL and type 2 diabetes were proven to possess causal relationships with sepsis. The agitation and inhibition of Apoa2 were indicated to influence sepsis and related syndromes. In conclusion, we first proposed Apoa2 as a target for H2 treatment.
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Affiliation(s)
- Yuanlin Wang
- Department of Anesthesiology, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Yan Fan
- Department of Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Yi Jiang
- Department of Anesthesiology, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Enquan Wang
- Department of Anesthesiology, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Yu Song
- Department of Anesthesiology, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Hongguang Chen
- Department of Anesthesiology, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Feier Xu
- Department of Anesthesiology, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Keliang Xie
- Department of Critical Care Medicine, Tianjin Medical University General Hospital, Tianjin 300052, China
| | - Yonghao Yu
- Department of Anesthesiology, Tianjin Medical University General Hospital, Tianjin 300052, China
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4
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Zhang X, Liu H, Hashimoto K, Yuan S, Zhang J. The gut–liver axis in sepsis: interaction mechanisms and therapeutic potential. Crit Care 2022; 26:213. [PMID: 35831877 PMCID: PMC9277879 DOI: 10.1186/s13054-022-04090-1] [Citation(s) in RCA: 31] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 07/09/2022] [Indexed: 12/20/2022] Open
Abstract
Sepsis is a potentially fatal condition caused by dysregulation of the body's immune response to an infection. Sepsis-induced liver injury is considered a strong independent prognosticator of death in the critical care unit, and there is anatomic and accumulating epidemiologic evidence that demonstrates intimate cross talk between the gut and the liver. Intestinal barrier disruption and gut microbiota dysbiosis during sepsis result in translocation of intestinal pathogen-associated molecular patterns and damage-associated molecular patterns into the liver and systemic circulation. The liver is essential for regulating immune defense during systemic infections via mechanisms such as bacterial clearance, lipopolysaccharide detoxification, cytokine and acute-phase protein release, and inflammation metabolic regulation. When an inappropriate immune response or overwhelming inflammation occurs in the liver, the impaired capacity for pathogen clearance and hepatic metabolic disturbance can result in further impairment of the intestinal barrier and increased disruption of the composition and diversity of the gut microbiota. Therefore, interaction between the gut and liver is a potential therapeutic target. This review outlines the intimate gut–liver cross talk (gut–liver axis) in sepsis.
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5
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Apolipoprotein A-II, a Player in Multiple Processes and Diseases. Biomedicines 2022; 10:biomedicines10071578. [PMID: 35884883 PMCID: PMC9313276 DOI: 10.3390/biomedicines10071578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/21/2022] [Accepted: 06/28/2022] [Indexed: 11/26/2022] Open
Abstract
Apolipoprotein A-II (apoA-II) is the second most abundant apolipoprotein in high-density lipoprotein (HDL) particles, playing an important role in lipid metabolism. Human and murine apoA-II proteins have dissimilar properties, partially because human apoA-II is dimeric whereas the murine homolog is a monomer, suggesting that the role of apoA-II may be quite different in humans and mice. As a component of HDL, apoA-II influences lipid metabolism, being directly or indirectly involved in vascular diseases. Clinical and epidemiological studies resulted in conflicting findings regarding the proatherogenic or atheroprotective role of apoA-II. Human apoA-II deficiency has little influence on lipoprotein levels with no obvious clinical consequences, while murine apoA-II deficiency causes HDL deficit in mice. In humans, an increased plasma apoA-II concentration causes hypertriglyceridemia and lowers HDL levels. This dyslipidemia leads to glucose intolerance, and the ensuing high blood glucose enhances apoA-II transcription, generating a vicious circle that may cause type 2 diabetes (T2D). ApoA-II is also used as a biomarker in various diseases, such as pancreatic cancer. Herein, we provide a review of the most recent findings regarding the roles of apoA-II and its functions in various physiological processes and disease states, such as cardiovascular disease, cancer, amyloidosis, hepatitis, insulin resistance, obesity, and T2D.
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Javadifar A, Ghezeldasht SA, Rahimi H, Valizadeh N, Borojerdi ZR, Vahidi Z, Rezaee SR. Possible deterioration of Apolipoproteins expression by HTLV-1 infection in favor of infected leukemic cells in adult T-cell leukemia/lymphoma (ATLL). GENE REPORTS 2022. [DOI: 10.1016/j.genrep.2022.101531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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7
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Billing F, Walter B, Fink S, Arefaine E, Pickarski L, Maier S, Kretz R, Jakobi M, Feuerer N, Schneiderhan-Marra N, Burkhardt C, Templin M, Zeck A, Krastev R, Hartmann H, Shipp C. Altered Proinflammatory Responses to Polyelectrolyte Multilayer Coatings Are Associated with Differences in Protein Adsorption and Wettability. ACS APPLIED MATERIALS & INTERFACES 2021; 13:55534-55549. [PMID: 34762399 DOI: 10.1021/acsami.1c16175] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
A full understanding of the relationship between surface properties, protein adsorption, and immune responses is lacking but is of great interest for the design of biomaterials with desired biological profiles. In this study, polyelectrolyte multilayer (PEM) coatings with gradient changes in surface wettability were developed to shed light on how this impacts protein adsorption and immune response in the context of material biocompatibility. The analysis of immune responses by peripheral blood mononuclear cells to PEM coatings revealed an increased expression of proinflammatory cytokines tumor necrosis factor (TNF)-α, macrophage inflammatory protein (MIP)-1β, monocyte chemoattractant protein (MCP)-1, and interleukin (IL)-6 and the surface marker CD86 in response to the most hydrophobic coating, whereas the most hydrophilic coating resulted in a comparatively mild immune response. These findings were subsequently confirmed in a cohort of 24 donors. Cytokines were produced predominantly by monocytes with a peak after 24 h. Experiments conducted in the absence of serum indicated a contributing role of the adsorbed protein layer in the observed immune response. Mass spectrometry analysis revealed distinct protein adsorption patterns, with more inflammation-related proteins (e.g., apolipoprotein A-II) present on the most hydrophobic PEM surface, while the most abundant protein on the hydrophilic PEM (apolipoprotein A-I) was related to anti-inflammatory roles. The pathway analysis revealed alterations in the mitogen-activated protein kinase (MAPK)-signaling pathway between the most hydrophilic and the most hydrophobic coating. The results show that the acute proinflammatory response to the more hydrophobic PEM surface is associated with the adsorption of inflammation-related proteins. Thus, this study provides insights into the interplay between material wettability, protein adsorption, and inflammatory response and may act as a basis for the rational design of biomaterials.
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Affiliation(s)
- Florian Billing
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Bernadette Walter
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Simon Fink
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Elsa Arefaine
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Luisa Pickarski
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Sandra Maier
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Robin Kretz
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Meike Jakobi
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Nora Feuerer
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
- Department of Biomedical Engineering, Eberhard Karls University Tübingen, 72076 Tübingen, Germany
| | | | - Claus Burkhardt
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Markus Templin
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Anne Zeck
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Rumen Krastev
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
- Faculty of Applied Chemistry, Reutlingen University, 72762 Reutlingen, Germany
| | - Hanna Hartmann
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
| | - Christopher Shipp
- NMI Natural and Medical Sciences Institute at the University of Tübingen, 72770 Reutlingen, Germany
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8
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Cho KH. Importance of Apolipoprotein A-I and A-II Composition in HDL and Its Potential for Studying COVID-19 and SARS-CoV-2. MEDICINES (BASEL, SWITZERLAND) 2021; 8:medicines8070038. [PMID: 34357154 PMCID: PMC8307872 DOI: 10.3390/medicines8070038] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2021] [Revised: 06/30/2021] [Accepted: 07/15/2021] [Indexed: 05/12/2023]
Abstract
The composition and properties of apolipoprotein (apo) A-I and apoA-II in high-density lipoproteins (HDL) might be critical to SARS-CoV-2 infection via SR-BI and antiviral activity against COVID-19. HDL containing native apoA-I showed potent antiviral activity, while HDL containing glycated apoA-I or other apolipoproteins did not. However, there has been no report to elucidate the putative role of apoA-II in the antiviral activity of HDL.
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Affiliation(s)
- Kyung-Hyun Cho
- Medical Innovation Complex, Korea Research Institute of Lipoproteins, Daegu 41061, Korea; ; Tel.: +82-53-964-1990; Fax: +82-53-965-1992
- LipoLab, Yeungnam University, Gyeongsan 712-749, Korea
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9
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Stasi A, Franzin R, Fiorentino M, Squiccimarro E, Castellano G, Gesualdo L. Multifaced Roles of HDL in Sepsis and SARS-CoV-2 Infection: Renal Implications. Int J Mol Sci 2021; 22:5980. [PMID: 34205975 PMCID: PMC8197836 DOI: 10.3390/ijms22115980] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 05/27/2021] [Accepted: 05/28/2021] [Indexed: 02/06/2023] Open
Abstract
High-density lipoproteins (HDLs) are a class of blood particles, principally involved in mediating reverse cholesterol transport from peripheral tissue to liver. Omics approaches have identified crucial mediators in the HDL proteomic and lipidomic profile, which are involved in distinct pleiotropic functions. Besides their role as cholesterol transporter, HDLs display anti-inflammatory, anti-apoptotic, anti-thrombotic, and anti-infection properties. Experimental and clinical studies have unveiled significant changes in both HDL serum amount and composition that lead to dysregulated host immune response and endothelial dysfunction in the course of sepsis. Most SARS-Coronavirus-2-infected patients admitted to the intensive care unit showed common features of sepsis disease, such as the overwhelmed systemic inflammatory response and the alterations in serum lipid profile. Despite relevant advances, episodes of mild to moderate acute kidney injury (AKI), occurring during systemic inflammatory diseases, are associated with long-term complications, and high risk of mortality. The multi-faceted relationship of kidney dysfunction with dyslipidemia and inflammation encourages to deepen the clarification of the mechanisms connecting these elements. This review analyzes the multifaced roles of HDL in inflammatory diseases, the renal involvement in lipid metabolism, and the novel potential HDL-based therapies.
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Affiliation(s)
- Alessandra Stasi
- Renal, Dialysis and Transplantation Unit, Department of Emergency and Organ Transplantation, University of Bari, 70124 Bari, Italy; (R.F.); (M.F.)
| | - Rossana Franzin
- Renal, Dialysis and Transplantation Unit, Department of Emergency and Organ Transplantation, University of Bari, 70124 Bari, Italy; (R.F.); (M.F.)
| | - Marco Fiorentino
- Renal, Dialysis and Transplantation Unit, Department of Emergency and Organ Transplantation, University of Bari, 70124 Bari, Italy; (R.F.); (M.F.)
| | - Enrico Squiccimarro
- Department of Emergency and Organ Transplant (DETO), University of Bari, 70124 Bari, Italy;
- Cardio-Thoracic Surgery Department, Heart & Vascular Centre, Maastricht University Medical Centre (MUMC), 6229HX Maastricht, The Netherlands
| | - Giuseppe Castellano
- Nephrology, Dialysis and Transplantation Unit, Advanced Research Center on Kidney Aging (A.R.K.A.), Department of Medical and Surgical Science, University of Foggia, 71122 Foggia, Italy;
| | - Loreto Gesualdo
- Renal, Dialysis and Transplantation Unit, Department of Emergency and Organ Transplantation, University of Bari, 70124 Bari, Italy; (R.F.); (M.F.)
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10
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Trakaki A, Marsche G. Current Understanding of the Immunomodulatory Activities of High-Density Lipoproteins. Biomedicines 2021; 9:biomedicines9060587. [PMID: 34064071 PMCID: PMC8224331 DOI: 10.3390/biomedicines9060587] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/17/2021] [Accepted: 05/19/2021] [Indexed: 02/06/2023] Open
Abstract
Lipoproteins interact with immune cells, macrophages and endothelial cells - key players of the innate and adaptive immune system. High-density lipoprotein (HDL) particles seem to have evolved as part of the innate immune system since certain HDL subspecies contain combinations of apolipoproteins with immune regulatory functions. HDL is enriched in anti-inflammatory lipids, such as sphingosine-1-phosphate and certain saturated lysophospholipids. HDL reduces inflammation and protects against infection by modulating immune cell function, vasodilation and endothelial barrier function. HDL suppresses immune cell activation at least in part by modulating the cholesterol content in cholesterol/sphingolipid-rich membrane domains (lipid rafts), which play a critical role in the compartmentalization of signaling pathways. Acute infections, inflammation or autoimmune diseases lower HDL cholesterol levels and significantly alter HDL metabolism, composition and function. Such alterations could have a major impact on disease progression and may affect the risk for infections and cardiovascular disease. This review article aims to provide a comprehensive overview of the immune cell modulatory activities of HDL. We focus on newly discovered activities of HDL-associated apolipoproteins, enzymes, lipids, and HDL mimetic peptides.
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11
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Kudinov VA, Alekseeva OY, Torkhovskaya TI, Baskaev KK, Artyushev RI, Saburina IN, Markin SS. High-Density Lipoproteins as Homeostatic Nanoparticles of Blood Plasma. Int J Mol Sci 2020; 21:E8737. [PMID: 33228032 PMCID: PMC7699323 DOI: 10.3390/ijms21228737] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Revised: 11/14/2020] [Accepted: 11/15/2020] [Indexed: 02/07/2023] Open
Abstract
It is well known that blood lipoproteins (LPs) are multimolecular complexes of lipids and proteins that play a crucial role in lipid transport. High-density lipoproteins (HDL) are a class of blood plasma LPs that mediate reverse cholesterol transport (RCT)-cholesterol transport from the peripheral tissues to the liver. Due to this ability to promote cholesterol uptake from cell membranes, HDL possess antiatherogenic properties. This function was first observed at the end of the 1970s to the beginning of the 1980s, resulting in high interest in this class of LPs. It was shown that HDL are the prevalent class of LPs in several types of living organisms (from fishes to monkeys) with high resistance to atherosclerosis and cardiovascular disorders. Lately, understanding of the mechanisms of the antiatherogenic properties of HDL has significantly expanded. Besides the contribution to RCT, HDL have been shown to modulate inflammatory processes, blood clotting, and vasomotor responses. These particles also possess antioxidant properties and contribute to immune reactions and intercellular signaling. Herein, we review data on the structure and mechanisms of the pleiotropic biological functions of HDL from the point of view of their evolutionary role and complex dynamic nature.
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Affiliation(s)
- Vasily A. Kudinov
- Laboratory of Cell Biology and Developmental Pathology, FSBSI Institute of General Pathology and Pathophysiology, 125315 Moscow, Russia;
- Experimental Drug Research and Production Department, Institute of Biomedical Chemistry, 119121 Moscow, Russia; (K.K.B.); (R.I.A.)
| | - Olga Yu. Alekseeva
- Cell Physiology Laboratory, Institute of Biomedical Problems, Russian Academy of Sciences, 123007 Moscow, Russia;
- Department of Biochemistry, People’s Friendship University (RUDN University), 117198 Moscow, Russia
| | - Tatiana I. Torkhovskaya
- Laboratory of Phospholipid Transport Systems and Nanomedicines, Institute of Biomedical Chemistry, 119121 Moscow, Russia;
| | - Konstantin K. Baskaev
- Experimental Drug Research and Production Department, Institute of Biomedical Chemistry, 119121 Moscow, Russia; (K.K.B.); (R.I.A.)
| | - Rafael I. Artyushev
- Experimental Drug Research and Production Department, Institute of Biomedical Chemistry, 119121 Moscow, Russia; (K.K.B.); (R.I.A.)
| | - Irina N. Saburina
- Laboratory of Cell Biology and Developmental Pathology, FSBSI Institute of General Pathology and Pathophysiology, 125315 Moscow, Russia;
| | - Sergey S. Markin
- Clinical Research Department, Institute of Biomedical Chemistry, 119121 Moscow, Russia;
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12
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Blauw LL, Wang Y, Willems van Dijk K, Rensen PCN. A Novel Role for CETP as Immunological Gatekeeper: Raising HDL to Cure Sepsis? Trends Endocrinol Metab 2020; 31:334-343. [PMID: 32033866 DOI: 10.1016/j.tem.2020.01.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2019] [Revised: 11/11/2019] [Accepted: 01/09/2020] [Indexed: 12/26/2022]
Abstract
Raising HDL using cholesteryl ester transfer protein (CETP) inhibitors failed to show a clinically relevant risk reduction of cardiovascular disease in clinical trials, inviting reconsideration of the role of CETP and HDL in human physiology. Based on solid evidence from studies with isolated macrophages, rodents, and humans, we propose that a major function of CETP may be to modulate HDL in order to help resolve bacterial infections. When gram-negative bacteria invade the blood, as occurs in sepsis, Kupffer cells lose their expression of CETP to increase HDL levels. This rise in HDL prevents systemic endotoxemia by binding lipopolysaccharide and induces a systemic proinflammatory response in macrophages to mediate bacterial clearance. This raises the interesting possibility to repurpose CETP inhibitors for the treatment of sepsis.
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Affiliation(s)
- Lisanne L Blauw
- Department of Internal Medicine, Division of Endocrinology, and Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands.
| | - Yanan Wang
- Department of Internal Medicine, Division of Endocrinology, and Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands
| | - Ko Willems van Dijk
- Department of Internal Medicine, Division of Endocrinology, and Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands; Department of Human Genetics, Leiden University Medical Center, Leiden, The Netherlands
| | - Patrick C N Rensen
- Department of Internal Medicine, Division of Endocrinology, and Einthoven Laboratory for Experimental Vascular Medicine, Leiden University Medical Center, Leiden, The Netherlands
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13
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Meilhac O, Tanaka S, Couret D. High-Density Lipoproteins Are Bug Scavengers. Biomolecules 2020; 10:biom10040598. [PMID: 32290632 PMCID: PMC7226336 DOI: 10.3390/biom10040598] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2020] [Revised: 04/04/2020] [Accepted: 04/06/2020] [Indexed: 12/11/2022] Open
Abstract
Lipoproteins were initially defined according to their composition (lipids and proteins) and classified according to their density (from very low- to high-density lipoproteins—HDLs). Whereas their capacity to transport hydrophobic lipids in a hydrophilic environment (plasma) is not questionable, their primitive function of cholesterol transporter could be challenged. All lipoproteins are reported to bind and potentially neutralize bacterial lipopolysaccharides (LPS); this is particularly true for HDL particles. In addition, HDL levels are drastically decreased under infectious conditions such as sepsis, suggesting a potential role in the clearance of bacterial material and, particularly, LPS. Moreover, "omics" technologies have unveiled significant changes in HDL composition in different inflammatory states, ranging from acute inflammation occurring during septic shock to low-grade inflammation associated with moderate endotoxemia such as periodontal disease or obesity. In this review, we will discuss HDL modifications associated with exposure to pathogens including bacteria, viruses and parasites, with a special focus on sepsis and the potential of HDL therapy in this context. Low-grade inflammation associated with atherosclerosis, periodontitis or metabolic syndrome may also highlight the protective role of HDLs in theses pathologies by other mechanisms than the reverse transport of cholesterol.
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Affiliation(s)
- Olivier Meilhac
- Université de la Réunion, Inserm, UMR 1188 Diabète athérothrombose Thérapies Réunion Océan Indien (DéTROI), F-97490 Sainte-Clotilde, France; (S.T.); (D.C.)
- CHU de La Réunion, Centre d’Investigations Clinique 1410, 97410 Saint-Pierre, France
- Correspondence: ; Tel.: +33-262-93-88-11
| | - Sébastien Tanaka
- Université de la Réunion, Inserm, UMR 1188 Diabète athérothrombose Thérapies Réunion Océan Indien (DéTROI), F-97490 Sainte-Clotilde, France; (S.T.); (D.C.)
- AP-HP, Service d’Anesthésie-Réanimation, CHU Bichat-Claude Bernard, 75018 Paris, France
| | - David Couret
- Université de la Réunion, Inserm, UMR 1188 Diabète athérothrombose Thérapies Réunion Océan Indien (DéTROI), F-97490 Sainte-Clotilde, France; (S.T.); (D.C.)
- CHU de La Réunion, Neurocritical Care Unit, 97410 Saint-Pierre, France
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14
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The Association of Vitamin D Status with Lipid Profile and Inflammation Biomarkers in Healthy Adolescents. Nutrients 2020; 12:nu12020590. [PMID: 32102427 PMCID: PMC7071498 DOI: 10.3390/nu12020590] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 02/20/2020] [Accepted: 02/21/2020] [Indexed: 01/19/2023] Open
Abstract
Background: The association between vitamin D status and inflammatory biomarkers and lipid profile is not well known, especially in adolescents. Therefore, the aim of the current study is to investigate the association of vitamin D status with serum lipids and inflammatory biomarkers, including IL-10, IL-6, hsCRP, and TNFR-2, in male adolescents. Methods and materials: A sample of seventy-one high school male students, aged 17 years old, from a high school in Tehran were enrolled in the study. They were divided into four groups including group with serum vitamin D below 25 (ng/mL) (SVD < 25; n = 36), 25 and above (ng/mL) (SVD ≥ 25; n = 35), negative-hsCRP (n = 48), and positive-hsCRP (n = 23). Weight, height, body mass index, dietary intake, serum lipids, and inflammatory biomarkers, including IL-10, IL-6, hsCRP, and TNFR-2, were measured. Results: In the (SVD < 25) group, the serum level of TNFR-2 was significantly higher compared to that in the (SVD ≥ 25) group. There was a significant negative association between serum TNFR-2 and vitamin D levels in the whole sample. We found significant lower levels of IL-10 in positive-hsCRP group compared to the negative-hsCRP group. In addition, there was a significant negative correlation between the serum vitamin D level and hsCRP in both hsCRP groups. The HDL level was lower in the (SVD < 25) group compared to that in the (SVD ≥ 25) group. Finally, there was a negative correlation between the serum HDL and hsCRP levels in the positive-hsCRP subjects. Conclusion: Based on the findings it can be concluded that serum vitamin D affects HDL and inflammation status. Although serum levels of HDL and inflammation status are both predictors of metabolic syndrome and cardiovascular disease, further studies are needed to prove it, especially in adolescents.
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15
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Yu Y, Song G. Lipopolysaccharide-Binding Protein and Bactericidal/Permeability-Increasing Protein in Lipid Metabolism and Cardiovascular Diseases. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1276:27-35. [PMID: 32705592 DOI: 10.1007/978-981-15-6082-8_3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Lipopolysaccharide-binding protein (LBP) and bactericidal/permeability-increasing protein (BPI) are the main members of BPI-like family based on the similar protein structure and conserved gene homology. Both LBP and BPI participate in lipid metabolism and thereby involve in pathogenesis of certain cardiovascular diseases. This chapter describes four aspects: (1) the loci of BPI and LBP in genome, (2) the characteristics of the cDNAs and expression patterns of LBP and BPI, (3) the structures and functions of LBP and BPI, and (4) the LBP and BPI in lipid metabolism and cardiovascular research.
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Affiliation(s)
- Yang Yu
- Institute of Atherosclerosis, Shandong First Medical University, Shandong, China.
| | - Guohua Song
- Institute of Atherosclerosis, Shandong First Medical University, Shandong, China
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16
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Bakker GJ, Schnitzler JG, Bekkering S, de Clercq NC, Koopen AM, Hartstra AV, Meessen ECE, Scheithauer TP, Winkelmeijer M, Dallinga‐Thie GM, Cani PD, Kemper EM, Soeters MR, Kroon J, Groen AK, van Raalte DH, Herrema H, Nieuwdorp M. Oral vancomycin treatment does not alter markers of postprandial inflammation in lean and obese subjects. Physiol Rep 2019; 7:e14199. [PMID: 31423751 PMCID: PMC6698488 DOI: 10.14814/phy2.14199] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Accepted: 07/14/2019] [Indexed: 12/30/2022] Open
Abstract
Intake of a high-fat meal induces a systemic inflammatory response in the postprandial which is augmented in obese subjects. However, the underlying mechanisms of this response have not been fully elucidated. We aimed to assess the effect of gut microbiota modulation on postprandial inflammatory response in lean and obese subjects. Ten lean and ten obese subjects with metabolic syndrome received oral vancomycin 500 mg four times per day for 7 days. Oral high-fat meal tests (50 g fat/m2 body surface area) were performed before and after vancomycin intervention. Gut microbiota composition, leukocyte counts, plasma lipopolysaccharides (LPS), LPS-binding protein (LBP), IL-6 and MCP-1 concentrations and monocyte CCR2 and cytokine expression were determined before and after the high-fat meal. Oral vancomycin treatment resulted in profound changes in gut microbiota composition and significantly decreased bacterial diversity in both groups (phylogenetic diversity pre- versus post-intervention: lean, 56.9 ± 7.8 vs. 21.4 ± 6.6, P < 0.001; obese, 53.9 ± 7.8 vs. 21.0 ± 5.9, P < 0.001). After intervention, fasting plasma LPS significantly increased (lean, median [IQR] 0.81 [0.63-1.45] EU/mL vs. 2.23 [1.33-3.83] EU/mL, P = 0.017; obese, median [IQR] 0.76 [0.45-1.03] EU/mL vs. 1.44 [1.11-4.24], P = 0.014). However, postprandial increases in leukocytes and plasma LPS were unaffected by vancomycin in both groups. Moreover, we found no changes in plasma LBP, IL-6 and MCP-1 or in monocyte CCR2 expression. Despite major vancomycin-induced disruption of the gut microbiota and increased fasting plasma LPS, the postprandial inflammatory phenotype in lean and obese subjects was unaffected in this study.
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Affiliation(s)
- Guido J. Bakker
- Department of Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Johan G. Schnitzler
- Department of Experimental Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Siroon Bekkering
- Department of Experimental Internal MedicineRadboud University Medical CentreNijmegenThe Netherlands
| | - Nicolien C. de Clercq
- Department of Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Annefleur M. Koopen
- Department of Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Annick V. Hartstra
- Department of Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Emma C. E. Meessen
- Department of Endocrinology and MetabolismAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Torsten P. Scheithauer
- Department of Internal Medicine, Diabetes CenterAmsterdam UMC, Location VUMC at Vrije Universiteit AmsterdamAmsterdamThe Netherlands
| | - Maaike Winkelmeijer
- Department of Experimental Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Geesje M. Dallinga‐Thie
- Department of Experimental Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Patrice D. Cani
- WELBIO – Walloon Excellence in Life Sciences and Biotechnology, Metabolism and NutritionLouvain Drug Research Institute, Université Catholique de LouvainBrusselsBelgium
| | - Elles Marleen Kemper
- Department of Clinical PharmacyAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Maarten R. Soeters
- Department of Endocrinology and MetabolismAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Jeffrey Kroon
- Department of Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
- Department of Experimental Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Albert K. Groen
- Department of Experimental Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Daniël H. van Raalte
- Department of Internal Medicine, Diabetes CenterAmsterdam UMC, Location VUMC at Vrije Universiteit AmsterdamAmsterdamThe Netherlands
- Amsterdam UMC, ICar at Vrije Universiteit AmsterdamAmsterdamThe Netherlands
| | - Hilde Herrema
- Department of Experimental Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
| | - Max Nieuwdorp
- Department of Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
- Department of Experimental Vascular MedicineAmsterdam UMC, Location AMC at University of AmsterdamAmsterdamThe Netherlands
- Department of Internal Medicine, Diabetes CenterAmsterdam UMC, Location VUMC at Vrije Universiteit AmsterdamAmsterdamThe Netherlands
- Amsterdam UMC, ICar at Vrije Universiteit AmsterdamAmsterdamThe Netherlands
- Department of Molecular and Clinical Medicine, Wallenberg LaboratorySahlgrenska Academy, University of GothenburgGothenburgSweden
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17
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Bagdade JD, Jilma B, Hudgins LC, Alaupovic P, McCurdy CE. LpA-II:B:C:D:E: a new immunochemically-defined acute phase lipoprotein in humans. Lipids Health Dis 2018; 17:127. [PMID: 29807532 PMCID: PMC5972402 DOI: 10.1186/s12944-018-0769-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Accepted: 05/04/2018] [Indexed: 11/25/2022] Open
Abstract
Background Previous studies of lipoproteins in patients with sepsis have been performed on density fractions isolated by conventional ultracentrifugation that are heterogeneous and provide no information about the cargo of apoproteins present in the immunochemically distinct subclasses that populate the density classes. Since apoproteins are now known to have important roles in host defense, we have separated these subclasses according to their apoprotein content and characterized their changes during experimental endotoxemia in human volunteers. Methods We have studied apoB- and apoA containing lipoprotein subclasses in twelve healthy male volunteers before and for 8 h after a single dose of endotoxin (ET; 2 μg/kg) to stimulate inflammation. Results After endotoxin, TG, TC, apoB and the apoB-containing lipoprotein cholesterol-rich subclass LpB and two of the three triglyceride-rich subclasses (TGRLP: Lp:B:C, LpB:C:E+ LpB:E) all declined. In contrast, the third TGRLP, LpA-II:B:C:D:E (“complex particle”), after reaching a nadir at 4 h rose 49% above baseline, p = .006 at 8 h and became the dominant particle in the TGRLP pool. This increment exceeds the threshold of > 25% change required for designation as an acute phase protein. Simultaneous decreases in LpA-I:A-II and LpB:C:E + LpB:E suggest that these subclasses undergo post-translational modification and contribute to the formation of new LpA-II:B:C:D:E particles. Conclusions We have identified a new acute phase lipoprotein whose apoprotein constituents have metabolic and immunoregulatory properties applicable to host defense that make it well constituted to engage in the APR.
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Affiliation(s)
- John D Bagdade
- Department of Human Physiology, University of Oregon, 122c Esslinger Hall, Eugene, OR, 97403, USA.
| | - Bernd Jilma
- Department of Medicine and Pharmacology, Medical University of Vienna, 1090, Vienna, Austria
| | - Lisa C Hudgins
- Department of Medicine, Weill Cornell Medical College and the Rogosin Institute, New York, NY, 10065, USA
| | - Petar Alaupovic
- Lipid and Lipoprotein Laboratory, Oklahoma Medical Research Foundation, Oklahoma City, OK, 73104, USA
| | - Carrie E McCurdy
- Department of Human Physiology, University of Oregon, 122c Esslinger Hall, Eugene, OR, 97403, USA
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18
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Difference in the Vitreal Protein Profiles of Patients with Proliferative Diabetic Retinopathy with and without Intravitreal Conbercept Injection. J Ophthalmol 2018; 2018:7397610. [PMID: 29850212 PMCID: PMC5932980 DOI: 10.1155/2018/7397610] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Accepted: 03/25/2018] [Indexed: 11/22/2022] Open
Abstract
Purpose To examine the difference in the vitreal protein profiles of patients with proliferative diabetic retinopathy (PDR) with and without preoperative intravitreal conbercept (IVC) treatment. Methods Liquid chromatography-tandem mass spectrometry- (LC-MS/MS-) based proteomic methods were used to determine the protein profiles of the vitreous humor in patients with PDR treated with (IVC group; n = 9) and without (PDR group; n = 8) preoperative IVC. Gene ontology (GO) annotation and REACTOME pathway analysis were obtained to overview differentially expressed proteins between each group. Intravitreal levels of apolipoprotein A-II (APOA2) and ceruloplasmin (CP) were measured using enzyme-linked immunosorbent assays. Results 307 proteins were expressed differentially between PDR and IVC groups, including 218 proteins downregulated in response to IVC. The most notable GO annotations in level 3 and REACTOME pathways describing the differentially expressed proteins were “innate immune response” and “platelet degranulation.” The intravitreal levels of APOA2 and CP were lower in the IVC group than in the PDR group (p < 0.01). Conclusions In addition to decreasing the intravitreal vascular endothelial growth factor level, IVC may alter the vitreal protein profile in patients with PDR, with the differentially regulated proteins involved in the immune response, platelet degranulation, complement activation, and inflammation.
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19
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Yang M, Liu Y, Dai J, Li L, Ding X, Xu Z, Mori M, Miyahara H, Sawashita J, Higuchi K. Apolipoprotein A-II induces acute-phase response associated AA amyloidosis in mice through conformational changes of plasma lipoprotein structure. Sci Rep 2018; 8:5620. [PMID: 29618729 PMCID: PMC5884826 DOI: 10.1038/s41598-018-23755-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 03/16/2018] [Indexed: 12/25/2022] Open
Abstract
During acute-phase response (APR), there is a dramatic increase in serum amyloid A (SAA) in plasma high density lipoproteins (HDL). Elevated SAA leads to reactive AA amyloidosis in animals and humans. Herein, we employed apolipoprotein A-II (ApoA-II) deficient (Apoa2 -/- ) and transgenic (Apoa2Tg) mice to investigate the potential roles of ApoA-II in lipoprotein particle formation and progression of AA amyloidosis during APR. AA amyloid deposition was suppressed in Apoa2 -/- mice compared with wild type (WT) mice. During APR, Apoa2 -/- mice exhibited significant suppression of serum SAA levels and hepatic Saa1 and Saa2 mRNA levels. Pathological investigation showed Apoa2 -/- mice had less tissue damage and less inflammatory cell infiltration during APR. Total lipoproteins were markedly decreased in Apoa2 -/- mice, while the ratio of HDL to low density lipoprotein (LDL) was also decreased. Both WT and Apoa2 -/- mice showed increases in LDL and very large HDL during APR. SAA was distributed more widely in lipoprotein particles ranging from chylomicrons to very small HDL in Apoa2 -/- mice. Our observations uncovered the critical roles of ApoA-II in inflammation, serum lipoprotein stability and AA amyloidosis morbidity, and prompt consideration of therapies for AA and other amyloidoses, whose precursor proteins are associated with circulating HDL particles.
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Affiliation(s)
- Mu Yang
- Department of Aging Biology, Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine, Matsumoto, 290-8621, Japan. .,Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, 77030, USA.
| | - Yingye Liu
- Department of Aging Biology, Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine, Matsumoto, 290-8621, Japan.,Institute of Pediatric Research, Children's Hospital of Hebei Province, Shijiazhuang, 050031, China
| | - Jian Dai
- Department of Aging Biology, Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine, Matsumoto, 290-8621, Japan
| | - Lin Li
- Department of Aging Biology, Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine, Matsumoto, 290-8621, Japan
| | - Xin Ding
- Department of Aging Biology, Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine, Matsumoto, 290-8621, Japan
| | - Zhe Xu
- Department of Aging Biology, Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine, Matsumoto, 290-8621, Japan
| | - Masayuki Mori
- Department of Aging Biology, Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine, Matsumoto, 290-8621, Japan.,Department of Advanced Medicine for Health Promotion, Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Matsumoto, 290-8621, Japan
| | - Hiroki Miyahara
- Department of Aging Biology, Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine, Matsumoto, 290-8621, Japan
| | - Jinko Sawashita
- Department of Aging Biology, Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine, Matsumoto, 290-8621, Japan.,Department of Biological Science for Intractable Neurological Disease, Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Matsumoto, 390-8621, Japan
| | - Keiichi Higuchi
- Department of Aging Biology, Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine, Matsumoto, 290-8621, Japan.,Department of Biological Science for Intractable Neurological Disease, Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research, Shinshu University, Matsumoto, 390-8621, Japan
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20
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Yang M, Liu Y, Li L, Miyahara H, Ding X, Dai J, Sawashita J, Mori M, Higuchi K. Apolipoprotein A-II accelerates reactive AA amyloidosis. Amyloid 2017; 24:147-148. [PMID: 28434311 DOI: 10.1080/13506129.2017.1295949] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Mu Yang
- a Department of Aging Biology , Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine , Matsumoto , Japan
| | - Yingye Liu
- a Department of Aging Biology , Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine , Matsumoto , Japan
| | - Lin Li
- a Department of Aging Biology , Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine , Matsumoto , Japan
| | - Hiroki Miyahara
- a Department of Aging Biology , Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine , Matsumoto , Japan
| | - Xin Ding
- a Department of Aging Biology , Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine , Matsumoto , Japan
| | - Jian Dai
- a Department of Aging Biology , Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine , Matsumoto , Japan
| | - Jinko Sawashita
- a Department of Aging Biology , Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine , Matsumoto , Japan.,b Department of Biological Sciences for Intractable Neurological Diseases , Shinshu University , Matsumoto , Japan , and
| | - Masayuki Mori
- a Department of Aging Biology , Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine , Matsumoto , Japan.,c Department of Advanced Medicine for Health Promotion , IBS-ICCER, Shinshu University , Matsumoto , Japan
| | - Keiichi Higuchi
- a Department of Aging Biology , Institute of Pathogenesis and Disease Prevention, Shinshu University Graduate School of Medicine , Matsumoto , Japan.,b Department of Biological Sciences for Intractable Neurological Diseases , Shinshu University , Matsumoto , Japan , and
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21
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Molecular Characterization of Lipopolysaccharide Binding to Human α-1-Acid Glycoprotein. J Lipids 2012; 2012:475153. [PMID: 23316371 PMCID: PMC3539403 DOI: 10.1155/2012/475153] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Revised: 08/22/2012] [Accepted: 08/30/2012] [Indexed: 11/18/2022] Open
Abstract
The ability of AGP to bind circulating lipopolysaccharide (LPS) in plasma is believed to help reduce the proinflammatory effect of bacterial lipid A molecules. Here, for the first time we have characterized human AGP binding characteristics of the LPS from a number of pathogenic Gram-negative bacteria: Escherichia coli, Salmonella typhimurium, Klebsiella pneumonia, Pseudomonas aeruginosa, and Serratia marcescens. The binding affinity and structure activity relationships (SAR) of the AGP-LPS interactions were characterized by surface plasma resonance (SPR). In order to dissect the contribution of the lipid A, core oligosaccharide and O-antigen polysaccharide components of LPS, the AGP binding affinity of LPS from smooth strains, were compared to lipid A, Kdo2-lipid A, Ra, Rd, and Re rough LPS mutants. The SAR analysis enabled by the binding data suggested that, in addition to the important role played by the lipid A and core components of LPS, it is predominately the unique species- and strain-specific carbohydrate structure of the O-antigen polysaccharide that largely determines the binding affinity for AGP. Together, these data are consistent with the role of AGP in the binding and transport of LPS in plasma during acute-phase inflammatory responses to invading Gram-negative bacteria.
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22
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Oztug M, Martinon D, Weers PMM. Characterization of the apoLp-III/LPS complex: insight into the mode of binding interaction. Biochemistry 2012; 51:6220-7. [PMID: 22779761 DOI: 10.1021/bi300619a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Apolipoproteins are able to associate with lipopolysaccharides (LPS), potentially providing protection against septic shock. To gain insight into the molecular details of this binding interaction, apolipophorin III (apoLp-III) from Galleria mellonella was used as a model. The binding of apoLp-III to LPS was optimal around 37-40 °C, close to the LPS phase transition temperature. ApoLp-III formed complexes with LPS from E. coli (serotype O55:B5) with a diameter of ~20 nm and a molecular weight of ~390 kDa, containing four molecules of apoLp-III and 24 molecules of LPS. The LPS-bound form of the protein was substantially more resistant to guanidine-induced denaturation compared to unbound protein. The denaturation profile displayed a multiphase character with a steep drop in secondary structure between 0 and 1 M guanidine-HCl and a slower decrease above 1 M guanidine-HCl. In contrast, apoLp-III bound to detoxified LPS was only slightly more resistant to guanidine-HCl induced denaturation compared to unbound protein. Analysis of size-exclusion FPLC elution profiles of mixtures of apoLp-III with LPS or detoxified LPS indicated a much weaker binding interaction with detoxified LPS compared to intact LPS. These results indicate that apoLp-III initially interacts with exposed carbohydrate regions, but that the lipid A region is required for a more stable LPS binding interaction.
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Affiliation(s)
- Merve Oztug
- Department of Chemistry and Biochemistry, California State University Long Beach, 1250 Bellflower Blvd., Long Beach, CA 90840, USA
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23
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Corsetti JP, Bakker SJL, Sparks CE, Dullaart RPF. Apolipoprotein A-II influences apolipoprotein E-linked cardiovascular disease risk in women with high levels of HDL cholesterol and C-reactive protein. PLoS One 2012; 7:e39110. [PMID: 22723940 PMCID: PMC3377620 DOI: 10.1371/journal.pone.0039110] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2012] [Accepted: 05/17/2012] [Indexed: 11/19/2022] Open
Abstract
Background In a previous report by our group, high levels of apolipoprotein E (apoE) were demonstrated to be associated with risk of incident cardiovascular disease in women with high levels of C-reactive protein (CRP) in the setting of both low (designated as HR1 subjects) and high (designated as HR2 subjects) levels of high-density lipoprotein cholesterol (HDL-C). To assess whether apolipoprotein A-II (apoA-II) plays a role in apoE-associated risk in the two female groups. Methodology/Principal Outcome event mapping, a graphical data exploratory tool; Cox proportional hazards multivariable regression; and curve-fitting modeling were used to examine apoA-II influence on apoE-associated risk focusing on HDL particles with apolipoprotein A-I (apoA-I) without apoA-II (LpA-I) and HDL particles with both apoA-I and apoA-II (LpA-I:A-II). Results of outcome mappings as a function of apoE levels and the ratio of apoA-II to apoA-I revealed within each of the two populations, a high-risk subgroup characterized in each situation by high levels of apoE and additionally: in HR1, by a low value of the apoA-II/apoA-I ratio; and in HR2, by a moderate value of the apoA-II/apoA-I ratio. Furthermore, derived estimates of LpA-I and LpA-I:A-II levels revealed for high-risk versus remaining subjects: in HR1, higher levels of LpA-I and lower levels of LpA-I:A-II; and in HR2 the reverse, lower levels of LpA-I and higher levels of LpA-I:A-II. Results of multivariable risk modeling as a function of LpA-I and LpA-I:A-II (dichotomized as highest quartile versus combined three lower quartiles) revealed association of risk only for high levels of LpA-I:A-II in the HR2 subgroup (hazard ratio 5.31, 95% CI 1.12–25.17, p = 0.036). Furthermore, high LpA-I:A-II levels interacted with high apoE levels in establishing subgroup risk. Conclusions/Significance We conclude that apoA-II plays a significant role in apoE-associated risk of incident CVD in women with high levels of HDL-C and CRP.
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Affiliation(s)
- James P Corsetti
- Department of Pathology and Laboratory Medicine, University of Rochester School of Medicine and Dentistry, Rochester, New York, USA.
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Charles MA, Kane JP. New molecular insights into CETP structure and function: a review. J Lipid Res 2012; 53:1451-8. [PMID: 22679067 DOI: 10.1194/jlr.r027011] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Cholesteryl ester transfer protein (CETP) is important clinically and is the current target for new drug development. Its structure and mechanism of action has not been well understood. We have combined current new structural and functional methods to compare with relevant prior data. These analyses have led us to propose several steps in CETP's function at the molecular level, in the context of its interactions with lipoproteins, e.g., sensing, penetration, docking, selectivity, ternary complex formation, lipid transfer, and HDL dissociation. These new molecular insights improve our understanding of CETP's mechanisms of action.
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Affiliation(s)
- M Arthur Charles
- Department of Medicine University of California, San Francisco, CA 94158, USA.
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25
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Azzam KM, Fessler MB. Crosstalk between reverse cholesterol transport and innate immunity. Trends Endocrinol Metab 2012; 23:169-78. [PMID: 22406271 PMCID: PMC3338129 DOI: 10.1016/j.tem.2012.02.001] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 01/30/2012] [Accepted: 02/01/2012] [Indexed: 02/06/2023]
Abstract
Although lipid metabolism and host defense are widely considered to be very divergent disciplines, compelling evidence suggests that host cell handling of self- and microbe-derived (e.g. lipopolysaccharide, LPS) lipids may have common evolutionary roots, and that they indeed may be inseparable processes. The innate immune response and the homeostatic network controlling cellular sterol levels are now known to regulate each other reciprocally, with important implications for several common diseases, including atherosclerosis. In the present review we discuss recent discoveries that provide new insight into the bidirectional crosstalk between reverse cholesterol transport and innate immunity, and highlight the broader implications of these findings for the development of therapeutics.
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Affiliation(s)
- Kathleen M Azzam
- Laboratory of Respiratory Biology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709, USA
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26
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Gump BB, MacKenzie JA, Dumas AK, Palmer CD, Parsons PJ, Segu ZM, Mechref YS, Bendinskas KG. Fish consumption, low-level mercury, lipids, and inflammatory markers in children. ENVIRONMENTAL RESEARCH 2012; 112:204-211. [PMID: 22030286 PMCID: PMC3267839 DOI: 10.1016/j.envres.2011.10.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2011] [Revised: 10/01/2011] [Accepted: 10/05/2011] [Indexed: 05/29/2023]
Abstract
There is considerable evidence that consuming fish has numerous health benefits, including a reduced risk of cardiovascular disease. However, fish is also the primary source of human exposure to mercury (Hg). In a cross-sectional study of 9-11 year old children (N=100), we measured fish consumption, blood lipids, total blood Hg, diurnal salivary cortisol (4 samples collected throughout the day), and performed a proteomic analysis of serum proteins using spectral count shotgun proteomics. Children who consumed fish had a significantly more atheroprotective lipid profile but higher levels of blood Hg relative to children that did not consume fish. Although the levels of blood Hg were very low in these children (M=0.77 μg/L; all but 1 participant had levels below 3.27 μg/L), increasing blood Hg was significantly associated with blunted diurnal cortisol levels. Blood Hg was also significantly associated with acute-phase proteins suggesting systemic inflammation, and several of these proteins were found to significantly reduce the association between Hg and diminished cortisol when included in the model. This study of a pediatric population is the first to document an association between blood Hg, systemic inflammation, and endocrine disruption in humans. Without a better understanding of the long-term consequences of an atheroprotective lipid profile relative to blunted diurnal cortisol and systemic inflammation, a determination of the risk-benefit ratio for fish consumption by children is not possible.
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Affiliation(s)
- Brooks B Gump
- Department of Public Health, Food Studies, and Nutrition, Syracuse University, Syracuse, NY 13244, USA.
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Kirk PDW, Witkover A, Courtney A, Lewin AM, Wait R, Stumpf MPH, Richardson S, Taylor GP, Bangham CRM. Plasma proteome analysis in HTLV-1-associated myelopathy/tropical spastic paraparesis. Retrovirology 2011; 8:81. [PMID: 21992623 PMCID: PMC3210102 DOI: 10.1186/1742-4690-8-81] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2011] [Accepted: 10/12/2011] [Indexed: 11/13/2022] Open
Abstract
Background Human T lymphotropic virus Type 1 (HTLV-1) causes a chronic inflammatory disease of the central nervous system known as HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM) which resembles chronic spinal forms of multiple sclerosis (MS). The pathogenesis of HAM remains uncertain. To aid in the differential diagnosis of HAM and to identify pathogenetic mechanisms, we analysed the plasma proteome in asymptomatic HTLV-1 carriers (ACs), patients with HAM, uninfected controls, and patients with MS. We used surface-enhanced laser desorption-ionization (SELDI) mass spectrometry to analyse the plasma proteome in 68 HTLV-1-infected individuals (in two non-overlapping sets, each comprising 17 patients with HAM and 17 ACs), 16 uninfected controls, and 11 patients with secondary progressive MS. Candidate biomarkers were identified by tandem Q-TOF mass spectrometry. Results The concentrations of three plasma proteins - high [β2-microglobulin], high [Calgranulin B], and low [apolipoprotein A2] - were specifically associated with HAM, independently of proviral load. The plasma [β2-microglobulin] was positively correlated with disease severity. Conclusions The results indicate that monocytes are activated by contact with activated endothelium in HAM. Using β2-microglobulin and Calgranulin B alone we derive a diagnostic algorithm that correctly classified the disease status (presence or absence of HAM) in 81% of HTLV-1-infected subjects in the cohort.
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Affiliation(s)
- Paul D W Kirk
- Department of Immunology, Wright-Fleming Institute, Imperial College, London W2 1PG, UK
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Wang Y, Sawashita J, Qian J, Zhang B, Fu X, Tian G, Chen L, Mori M, Higuchi K. ApoA-I deficiency in mice is associated with redistribution of apoA-II and aggravated AApoAII amyloidosis. J Lipid Res 2011; 52:1461-70. [PMID: 21622630 DOI: 10.1194/jlr.m013235] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Apolipoprotein A-II (apoA-II) is the second major apolipoprotein following apolipoprotein A-I (apoA-I) in HDL. ApoA-II has multiple physiological functions and can form senile amyloid fibrils (AApoAII) in mice. Most circulating apoA-II is present in lipoprotein A-I/A-II. To study the influence of apoA-I on apoA-II and AApoAII amyloidosis, apoA-I-deficient (C57BL/6J.Apoa1⁻/⁻) mice were used. Apoa1⁻/⁻ mice showed the expected significant reduction in total cholesterol (TC), HDL cholesterol (HDL-C), and triglyceride (TG) plasma levels. Unexpectedly, we found that apoA-I deficiency led to redistribution of apoA-II in HDL and an age-related increase in apoA-II levels, accompanied by larger HDL particle size and an age-related increase in TC, HDL-C, and TG. Aggravated AApoAII amyloidosis was induced in Apoa1⁻/⁻ mice systemically, especially in the heart. These results indicate that apoA-I plays key roles in maintaining apoA-II distribution and HDL particle size. Furthermore, apoA-II redistribution may be the main reason for aggravated AApoAII amyloidosis in Apoa1⁻/⁻ mice. These results may shed new light on the relationship between apoA-I and apoA-II as well as provide new information concerning amyloidosis mechanism and therapy.
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Affiliation(s)
- Yaoyong Wang
- Department of Aging Biology, Institute on Aging and Adaptation, Graduate School of Medicine, Shinshu University, Matsumoto, Japan
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29
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Gill C, Parkinson E, Church MK, Skipp P, Scott D, White AJ, O'Connor CD, Clough GF. A qualitative and quantitative proteomic study of human microdialysate and the cutaneous response to injury. AAPS JOURNAL 2011; 13:309-17. [PMID: 21494910 DOI: 10.1208/s12248-011-9269-6] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Accepted: 03/07/2011] [Indexed: 01/16/2023]
Abstract
The extracellular fluid space is the site of intercellular communication and represents an important source of mediators that can shed light on the parenchymal environment. Sampling of this compartment using continuous microdialysis allows assessment of the temporal changes in extracellular mediators involved in tissue homeostasis and disease processes. However, novel biomarker identification is limited by the current need to utilize specific, targeted molecular assays. The aim of our study was to explore the use of qualitative and quantitative proteomic approaches to define the protein content of dermal dialysate. Timed dermal dialysate samples were collected from healthy human volunteers for 5 h following probe insertion, using a 3,000-kDa MWCO membrane perfused at a rate of 3 μl/min. Dialysate proteins were identified using GeLC-MS/MS and iTRAQ approaches and functions assigned according to the Gene Ontology classification system. More than 80 proteins (size range 11-516 kDa) originating from both extracellular and intracellular fluid space were identified using the qualitative approach of GeLC-MS/MS. Quantitative iTRAQ data were obtained for 27 proteins with relative change ratios between consecutive timed samples showing changes of >1.5-fold. Interstitial proteins can be identified and measured using shotgun proteomic techniques and changes detected during the acute inflammatory response. Our findings provide a platform from which to explore novel protein biomarkers and their modulation in health and disease.
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Affiliation(s)
- Carolyn Gill
- Centre for Proteomic Research, School of Biological Sciences, University of Southampton, UK
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Blomkalns AL, Stoll LL, Shaheen W, Romig-Martin SA, Dickson EW, Weintraub NL, Denning GM. Low level bacterial endotoxin activates two distinct signaling pathways in human peripheral blood mononuclear cells. JOURNAL OF INFLAMMATION-LONDON 2011; 8:4. [PMID: 21352551 PMCID: PMC3056742 DOI: 10.1186/1476-9255-8-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Accepted: 02/25/2011] [Indexed: 01/11/2023]
Abstract
BACKGROUND Bacterial endotoxin, long recognized as a potent pro-inflammatory mediator in acute infectious processes, has more recently been identified as a risk factor for atherosclerosis and other cardiovascular diseases. When endotoxin enters the bloodstream, one of the first cells activated is the circulating monocyte, which exhibits a wide range of pro-inflammatory responses. METHODS We studied the effect of low doses of E. coli LPS on IL-8 release and superoxide formation by freshly isolated human peripheral blood mononuclear cells (PBMC). RESULTS IL-8 release was consistently detectable at 10 pg/ml of endotoxin, reaching a maximum at 1 ng/ml, and was exclusively produced by monocytes; the lymphocytes neither produced IL-8, nor affected monocyte IL-8 release. Superoxide production was detectable at 30 pg/ml of endotoxin, reaching a maximum at 3 ng/ml. Peak respiratory burst activity was seen at 15-20 min, and superoxide levels returned to baseline by 1 h. IL-8 release was dependent on both membrane-associated CD14 (mCD14) and Toll-like receptor 4 (TLR4. Superoxide production was dependent on the presence of LBP, but was not significantly affected by a blocking antibody to TLR4. Moreover, treatment with lovastatin inhibited LPS-dependent IL-8 release and superoxide production. CONCLUSIONS These findings suggest that IL-8 release and the respiratory burst are regulated by distinct endotoxin-dependent signaling pathways in PBMC in low level of endotoxin exposure. Selectively modulating these pathways could lead to new approaches to treat chronic inflammatory diseases, such as atherosclerosis, while preserving the capacity of monocytes to respond to acute bacterial infections.
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Affiliation(s)
- Andra L Blomkalns
- Department of Emergency Medicine, University of Cincinnati, Cincinnati, OH USA
| | - Lynn L Stoll
- Department of Emergency Medicine, Roy J. And Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Wassim Shaheen
- The Department of Internal Medicine, Division of Cardiovascular Diseases, Roy J. And Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Sara A Romig-Martin
- Department of Emergency Medicine, Roy J. And Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA, USA
| | - Eric W Dickson
- Department of Emergency Medicine, University of Massachusetts Medical School, Worcester, MA, USA
| | - Neal L Weintraub
- Department of Internal Medicine, Division of Cardiovascular Diseases, University of Cincinnati, Cincinnati, OH, USA
| | - Gerene M Denning
- Department of Emergency Medicine, Roy J. And Lucille A. Carver College of Medicine, University of Iowa, Iowa City, IA, USA
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Abstract
Plasma lipoproteins (VLDL, LDL, Lp[a] and HDL) function primarily in lipid transport among tissues and organs. However, cumulative evidence suggests that lipoproteins may also prevent bacterial, viral and parasitic infections and are therefore a component of innate immunity. Lipoproteins can also detoxify lipopolysaccharide and lipoteichoic acid. Infections can induce oxidation of LDL, and oxLDL in turn plays important anti-infective roles and protects against endotoxin-induced tissue damage. There is also evidence that apo(a) is protective against pathogens. Taken together, the evidence suggests that it might be valuable to introduce the concept that plasma lipoproteins belong in the realm of host immune response.
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Affiliation(s)
- Runlin Han
- Research Center of Plasma Lipoprotein Immunology, College of Animal Medicine, Inner Mongolia Agricultural University, 306 Zhaowuda Road, Huhhot, 010018, China.
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32
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Abstract
Plasma lipoproteins (VLDL, LDL, Lp[a] and HDL) function primarily in lipid transport among tissues and organs. However, cumulative evidence suggests that lipoproteins may also prevent bacterial, viral and parasitic infections and are therefore a component of innate immunity. Lipoproteins can also detoxify lipopolysaccharide and lipoteichoic acid. Infections can induce oxidation of LDL, and oxLDL in turn plays important anti-infective roles and protects against endotoxin-induced tissue damage. There is also evidence that apo(a) is protective against pathogens. Taken together, the evidence suggests that it might be valuable to introduce the concept that plasma lipoproteins belong in the realm of host immune response.
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Affiliation(s)
- Runlin Han
- Research Center of Plasma Lipoprotein Immunology, College of Animal Medicine, Inner Mongolia Agricultural University, 306 Zhaowuda Road, Huhhot, 010018, China.
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Danielsen M, Codrea MC, Ingvartsen KL, Friggens NC, Bendixen E, Røntved CM. Quantitative milk proteomics - Host responses to lipopolysaccharide-mediated inflammation of bovine mammary gland. Proteomics 2010; 10:2240-9. [DOI: 10.1002/pmic.200900771] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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