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Wu Q, Sheng Q, Michell D, Ramirez-Solano M, Posey O, Phothisane A, Shaik S, Vickers KC, Ormseth MJ. Anti-Inflammatory Effect of High-Density Lipoprotein Blunted by Delivery of Altered MicroRNA Cargo in Patients With Rheumatoid Arthritis. Arthritis Rheumatol 2024; 76:684-695. [PMID: 38111131 PMCID: PMC11045320 DOI: 10.1002/art.42782] [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: 06/10/2023] [Revised: 11/02/2023] [Accepted: 12/13/2023] [Indexed: 12/20/2023]
Abstract
OBJECTIVE High-density lipoprotein (HDL) has well-characterized anti-atherogenic cholesterol efflux and antioxidant functions. Another function of HDL uncharacterized in rheumatoid arthritis (RA) is its ability to transport microRNAs (miRNAs) between cells and thus alter cellular function. The study's purpose was to determine if HDL-miRNA cargo is altered and affects inflammation in RA. METHODS HDL-microRNAs were characterized in 30 RA and 30 control participants by next generation sequencing and quantitative polymerase chain reaction. The most abundant differentially expressed miRNA was evaluated further. The function of miR-1246 was assessed by miRNA mimics, antagomiRs, small interfering RNA knockdown, and luciferase assays. Monocyte-derived macrophages were treated with miR-1246-loaded HDL and unmodified HDL from RA and control participants to measure delivery of miR-1246 and its effect on interleukin-6 (IL-6). RESULTS The most abundant miRNA on HDL was miR-1246; it was significantly enriched two-fold on HDL from RA versus control participants. HDL-mediated miR-1246 delivery to macrophages significantly increased IL6 expression 43-fold. miR-1246 delivery significantly decreased DUSP3 1.5-fold and DUSP3 small interfering RNA knockdown increased macrophage IL6 expression. Luciferase assay indicated DUSP3 is a direct target of miR-1246. Unmodified HDL from RA delivered 1.6-fold more miR-1246 versus control participant HDL. Unmodified HDL from both RA and control participants attenuated activated macrophage IL6 expression, but this effect was significantly blunted in RA so that IL6 expression was 3.4-fold higher after RA versus control HDL treatment. CONCLUSION HDL-miR-1246 was increased in RA versus control participants and delivery of miR-1246 to macrophages increased IL-6 expression by targeting DUSP3. The altered HDL-miRNA cargo in RA blunted HDL's anti-inflammatory effect.
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Affiliation(s)
- Qiong Wu
- Vanderbilt University Medical Center, Nashville, TN, USA
| | - Quanhu Sheng
- Vanderbilt University Medical Center, Nashville, TN, USA
| | | | | | - Olivia Posey
- Vanderbilt University Medical Center, Nashville, TN, USA
| | | | | | | | - Michelle J Ormseth
- Vanderbilt University Medical Center, Nashville, TN, USA
- Tennessee Valley Healthcare System, U.S. Department of Veterans Affairs, Nashville, TN USA
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Chen Q, Wang L, Song H, Xing W, Shi J, Li Y, Wang Z, Chen J, Xie N, Zhao W. Deficiency of SR-B1 reduced the tumor load of colitis-induced or APC min /+ -induced colorectal cancer. Cancer Med 2023; 12:19744-19757. [PMID: 37766594 PMCID: PMC10587988 DOI: 10.1002/cam4.6534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 08/03/2023] [Accepted: 09/01/2023] [Indexed: 09/29/2023] Open
Abstract
BACKGROUND Colorectal cancer (CRC) is one of the most common tumors in the world. Cholesterol plays an important role in the pathogenesis of tumors. One of the cholesterol transporters, scavenger receptor class B type 1 (SR-B1), a multi-ligand membrane receptor protein, is expressed in the intestines which also highly expressed in various tumors. But the potential mechanism of SR-B1 in CRC development has not been reported. AIMS This study aimed to clarify the importance of SR-B1 in the development and prognosis of CRC as much as possible to provide a possible strategy in CRC treatment. MATERIALS & METHODS In this study, we used SR-B1 gene knockdown mice to study the effect of SR-B1 on colitis-induced or APCmin/+ -induced CRC. The expression of related molecules were detected through the immunohistochemistry and hematoxylin-eosin staining, western blot analysis, and Flow cytometry. The gene expression and microbiota in microenvironment of CRC mice were analyzed through eukaryotic mRNA sequencing and 16S rRNA high-throughput sequencing. RESULTS The results showed that SR-B1 knockdown reduced the tumor load of colitis-induced or APCmin/+ -induced CRC. SR-B1 knockdown improved the immune microenvironment by affecting the level of tumor-associated macrophage (TAM), mononuclear myeloid-derived suppressor cells (M-MDSCs), granulocytic myeloid-derived suppressor cells (G-MDSCs), programmed cell death-ligand 1 (PD-L1), and human leukocyte antigen class I-B (HLA-B), and also reduced the level of low-density lipoprotein receptor (LDL-R), and increased the level of ATP binding cassette transporter A1 (ABCA1) to regulate the cholesterol metabolism, and regulated the expression of related genes and intestinal microbiota. SR-B1 knockdown can also trigger the anti-CRC effect of anti-PD 1 in colitis-induced CRC. DISCUSSION SR-B1 deficiency significantly improved the immunity in tumor microenvironment of colitis-induced or APCmin/+ -induced CRC. In addition, the microbiota changes caused by SR-B1 deficiency favor improving the immune response to chemotherapeutic drugs and anti-PD1 therapy. The mechanism of action of SR-B1 deficiency on the development of CRC still needs further in-depth research. CONCLUSION This study provides a new treatment strategy for treating CRC by affecting the expression of SR-B1 in intestine.
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Affiliation(s)
- Qijun Chen
- School of Pharmaceutical SciencesCapital Medical UniversityBeijingChina
| | - Lixue Wang
- School of Pharmaceutical SciencesCapital Medical UniversityBeijingChina
| | - Hui Song
- School of Pharmaceutical SciencesCapital Medical UniversityBeijingChina
| | - Wen Xing
- School of Pharmaceutical SciencesCapital Medical UniversityBeijingChina
| | - Junfeng Shi
- School of Pharmaceutical SciencesCapital Medical UniversityBeijingChina
| | - Yudi Li
- School of Pharmaceutical SciencesCapital Medical UniversityBeijingChina
| | - Ziqian Wang
- School of Pharmaceutical SciencesCapital Medical UniversityBeijingChina
| | - Jinlong Chen
- School of Basic Medical SciencesCapital Medical UniversityBeijingChina
| | - Nan Xie
- School of Pharmaceutical SciencesCapital Medical UniversityBeijingChina
| | - Wenhua Zhao
- School of Pharmaceutical SciencesCapital Medical UniversityBeijingChina
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Zhao L, Niu J, Feng D, Wang X, Zhang R. Immune functions of pattern recognition receptors in Lepidoptera. Front Immunol 2023; 14:1203061. [PMID: 37398667 PMCID: PMC10312389 DOI: 10.3389/fimmu.2023.1203061] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2023] [Accepted: 06/05/2023] [Indexed: 07/04/2023] Open
Abstract
Pattern recognition receptors (PRRs), as the "sensors" in the immune response, play a prominent role in recognizing pathogen-associated molecular patterns (PAMPs) and initiating an effective defense response to pathogens in Lepidoptera. It is becoming increasingly clear that damage-associated molecular patterns (DAMPs) normally play a physiological role within cells; however, when exposed to extracellular, they may become "part-time" critical signals of the immune response. Based on research in recent years, we review herein typical PRRs of Lepidoptera, including peptidoglycan recognition protein (PGRP), gram-negative binding protein (GNBP), β-1,3-glucan recognition protein (βGRP), C-type lectin (CTL), and scavenger receptor (SR). We also outline the ways in which DAMPs participate in the immune response and the correlation between PRRs and immune escape. Taken together, these findings suggest that the role of PRRs in insect innate immunity may be much greater than expected and that it is possible to recognize a broader range of signaling molecules.
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Affiliation(s)
- Lin Zhao
- School of Life Science and Bio-Pharmaceutics, Shenyang Pharmaceutical University, Shenyang, China
| | - Jinlan Niu
- School of Life Science and Bio-Pharmaceutics, Shenyang Pharmaceutical University, Shenyang, China
| | - Disong Feng
- School of Life Science and Bio-Pharmaceutics, Shenyang Pharmaceutical University, Shenyang, China
| | - Xialu Wang
- School of Medical Devices, Shenyang Pharmaceutical University, Shenyang, China
| | - Rong Zhang
- School of Life Science and Bio-Pharmaceutics, Shenyang Pharmaceutical University, Shenyang, China
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4
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Staršíchová A. SR-B1-/-ApoE-R61h/h Mice Mimic Human Coronary Heart Disease. Cardiovasc Drugs Ther 2023:10.1007/s10557-023-07475-8. [PMID: 37273155 DOI: 10.1007/s10557-023-07475-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/22/2023] [Indexed: 06/06/2023]
Abstract
Cardiovascular diseases are the leading cause of death in the modern world. Atherosclerosis underlies the majority of these pathologies and may result in sudden life-threatening events such as myocardial infarction or stroke. Current concepts consider a rupture (resp. erosion) of "unstable/vulnerable" atherosclerotic plaques as a primary cause leading to thrombus formation and subsequent occlusion of the artery lumen finally triggering an acute clinical event. We and others described SR-B1-/-ApoE-R61h/h mice mimicking clinical coronary heart disease in all major aspects: from coronary atherosclerosis through vulnerable plaque ruptures leading to thrombus formation/coronary artery occlusion, finally resulting in myocardial infarction/ischemia. SR-B1-/-ApoE-R61h/h mouse provides a valuable model to study vulnerable/occlusive plaques, to evaluate bioactive compounds as well as new anti-inflammatory and "anti-rupture" drugs, and to test new technologies in experimental cardiovascular medicine. This review summarizes and discuss our knowledge about SR-B1-/-ApoE-R61h/h mouse model based on recent publications and experimental observations from the lab.
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Affiliation(s)
- Andrea Staršíchová
- Graduate School Cell Dynamics and Disease, University of Muenster, Muenster, Germany.
- European Institute for Molecular Imaging, University of Muenster, Muenster, Germany.
- Novogenia Covid GmbH, Eugendorf, Austria.
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Al-Kuraishy HM, Hussien NR, Al-Niemi MS, Fahad EH, Al-Buhadily AK, Al-Gareeb AI, Al-Hamash SM, Tsagkaris C, Papadakis M, Alexiou A, Batiha GES. SARS-CoV-2 induced HDL dysfunction may affect the host's response to and recovery from COVID-19. Immun Inflamm Dis 2023; 11:e861. [PMID: 37249296 DOI: 10.1002/iid3.861] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Revised: 04/18/2023] [Accepted: 04/21/2023] [Indexed: 05/31/2023] Open
Abstract
INTRODUCTION Covid-19 is linked with the development of cardio-metabolic disorders, including dyslipidemia, dysregulation of high-density lipoprotein (HDL), and low-density lipoprotein (LDL). Furthermore, SARS-Co-2 infection is associated with noteworthy changes in lipid profile, which is suggested as a possible biomarker to support the diagnosis and management of Covid-19. METHODS This paper adopts the literature review method to obtain information about how Covid-19 affects high-risk group patients and may cause severe and critical effects due to the development of acute lung injury and acute respiratory distress syndrome. A narrative and comprehensive review is presented. RESULTS Reducing HDL in Covid-19 is connected to the disease severity and poor clinical outcomes, suggesting that high HDL serum levels could benefit Covid-19. SARS-CoV-2 binds HDL, and this complex is attached to the co-localized receptors, facilitating viral entry. Therefore, SARS-CoV-2 infection may induce the development of dysfunctional HDL through different mechanisms, including induction of inflammatory and oxidative stress with activation of inflammatory signaling pathways. In turn, the induction of dysfunctional HDL induces the activation of inflammatory signaling pathways and oxidative stress, increasing Covid-19 severity. CONCLUSIONS Covid-19 is linked with the development of cardio-metabolic disorders, including dyslipidemia in general and dysregulation of high-density lipoprotein and low-density lipoprotein. Therefore, the present study aimed to overview the causal relationship between dysfunctional high-density lipoprotein and Covid-19.
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Affiliation(s)
- Hayder M Al-Kuraishy
- Department of Pharmacology, Toxicology, Medicine College of Medicine Al-Mustansiriyah University, Baghdad, Iraq
| | - Nawar R Hussien
- Department of Clinical Pharmacy, College of Pharmacy, Al-Farahidi University, Bagdad, Iraq
| | - Marwa S Al-Niemi
- Department of Clinical Pharmacy, College of Pharmacy, Al-Farahidi University, Bagdad, Iraq
| | - Esraa H Fahad
- Faculty of pharmacy, The University of Mashreq, Bagdad, Iraq
| | - Ali K Al-Buhadily
- Department of Clinical Pharmacology, Medicine and Therapeutic, Medical Faculty, College of Medicine, Al-Mustansiriya University, Baghdad, Iraq
| | - Ali I Al-Gareeb
- Department of Pharmacology, Toxicology, Medicine College of Medicine Al-Mustansiriyah University, Baghdad, Iraq
| | | | - Christos Tsagkaris
- Department of Health Sciences, Novel Global Community Educational Foundation, Hebersham, New South Wales, Australia
| | - Marios Papadakis
- Department of Surgery II, University Hospital Witten-Herdecke, University of Witten-Herdecke, Wuppertal, Germany
| | - Athanasios Alexiou
- Department of Science and Engineering, Novel Global Community Educational Foundation, Hebersham, New South Wales, Australia
- AFNP Med Austria, Wien, Austria
| | - Gaber El-Saber Batiha
- Department of Pharmacology and Therapeutics, Faculty of Veterinary Medicine, Damanhour University, Damanhour, AlBeheira, Egypt
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Alkazmi L, Al-Kuraishy HM, Al-Gareeb AI, Alexiou A, Papadakis M, Saad HM, Batiha GES. The potential role of scavenger receptor B type I (SR-BI) in SARS-CoV-2 infection. Immun Inflamm Dis 2023; 11:e786. [PMID: 37102664 PMCID: PMC10103078 DOI: 10.1002/iid3.786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2022] [Revised: 01/26/2023] [Accepted: 02/01/2023] [Indexed: 04/28/2023] Open
Abstract
Scavenger receptor type B I (SR-BI), the major receptor for high-density lipoprotein (HDL) mediates the delivery of cholesterol ester and cholesterol from HDL to the cell membrane. SR-BI is implicated as a receptor for entry of severe acute respiratory syndrome coronavirus type 2 (SARS-CoV-2). SR-BI is colocalized with the angiotensin-converting enzyme 2 (ACE2) increasing the binding and affinity of SARS-CoV-2 to ACE2 with subsequent viral internalization. SR-BI regulates lymphocyte proliferation and the release of pro-inflammatory cytokines from activated macrophages and lymphocytes. SR-BI is reduced during COVID-19 due to consumption by SARS-CoV-2 infection. COVID-19-associated inflammatory changes and high angiotensin II (AngII) might be possible causes of repression of SR-BI in SARS-CoV-2 infection. In conclusion, the downregulation of SR-BI in COVID-19 could be due to direct invasion by SARS-CoV-2 or through upregulation of pro-inflammatory cytokines, inflammatory signaling pathways, and high circulating AngII. Reduction of SR-BI in COVID-19 look like ACE2 may provoke COVID-19 severity through exaggeration of the immune response. Further studies are invoked to clarify the potential role of SR-BI in the pathogenesis of COVID-19 that could be protective rather than detrimental.
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Affiliation(s)
- Luay Alkazmi
- Biology Department, Faculty of Applied Sciences, Umm Al-Qura University, Makkah, Saudi Arabia
| | - Hayder M Al-Kuraishy
- Department of Clinical Pharmacology and Medicine, College of Medicine, ALmustansiriyia University, Baghdad, Iraq
| | - Ali I Al-Gareeb
- Department of Clinical Pharmacology and Medicine, College of Medicine, ALmustansiriyia University, Baghdad, Iraq
| | - Athanasios Alexiou
- Department of Science and Engineering, Novel Global Community Educational Foundation, Hebersham, New South Wales, Australia
- AFNP Med, Wien, Austria
| | - Marios Papadakis
- Department of Surgery II, University Hospital Witten-Herdecke, University of Witten-Herdecke, Wuppertal, Germany
| | - Hebatallah M Saad
- Department of Pathology, Faculty of Veterinary Medicine, Matrouh University, Matrouh, Egypt
| | - Gaber El-Saber Batiha
- Department of Pharmacology and Therapeutics, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt
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7
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Guo L, Wang W, Wang Q, Hao D, Ito M, Huang B, Mineo C, Shaul PW, Choi J, Huang LF, Li XA. The adrenal stress response is an essential host response against therapy-induced lethal immune activation. Sci Signal 2023; 16:eadd4900. [PMID: 36943922 PMCID: PMC10091512 DOI: 10.1126/scisignal.add4900] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
Cytokine release syndrome (CRS) is a systemic inflammatory syndrome associated with infection- or drug-induced T cell activation and can cause multiple organ failure and even death. Because current treatments are ineffective in some patients with severe CRS, we set out to identify risk factors and mechanisms behind severe CRS that might lead to preventive therapies and better clinical outcomes in patients. In mice, we found that deficiency in the adrenal stress response-with similarities to such in patients called relative adrenal insufficiency (RAI)-conferred a high risk for lethal CRS. Mice treated with CD3 antibodies were protected against lethal CRS by the production of glucocorticoids (GC) induced by the adrenal stress response in a manner dependent on the scavenger receptor B1 (SR-BI), a receptor for high-density lipoprotein (HDL). Mice with whole-body or adrenal gland-specific SR-BI deficiency exhibited impaired GC production, more severe CRS, and increased mortality in response to CD3 antibodies. Pretreatment with a low dose of GC effectively suppressed the development of CRS and rescued survival in SR-BI-deficient mice without compromising T cell function through apoptosis. Our findings suggest that RAI may be a risk factor for therapy-induced CRS and that pretreating RAI patients with GC may prevent lethal CRS.
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Affiliation(s)
- Ling Guo
- Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, KY 40536, USA
| | - Weinan Wang
- Division of Experimental Hematology and Cancer Biology, Brain Tumor Center, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Qian Wang
- Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, KY 40536, USA
| | - Dan Hao
- Department of Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY 40536, USA
| | - Misa Ito
- Department of Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY 40536, USA
| | - Bin Huang
- Division of Cancer Biostatistics, University of Kentucky College of Medicine, Lexington, KY 40536, USA
| | - Chieko Mineo
- Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Philip W Shaul
- Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Jaebok Choi
- Department of Medicine, Washington University School of Medicine at St. Louis, St. Louis, MO 63110, USA
| | - L Frank Huang
- Division of Experimental Hematology and Cancer Biology, Brain Tumor Center, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, 45229, USA
| | - Xiang-An Li
- Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, KY 40536, USA
- Department of Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY 40536, USA
- Lexington VA Healthcare System, 1101 Veterans Drive, Lexington, KY 40502, USA
- Department of Physiology, University of Kentucky College of Medicine, Lexington, KY 40536, USA
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8
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Dunigan-Russell K, Yaeger MJ, Hodge MX, Kilburg-Basnyat B, Reece SW, Birukova A, Guttenberg MA, Novak C, Chung S, Ehrmann BM, Wallace ED, Tokarz D, Majumder N, Xia L, Christman JW, Shannahan J, Ballinger MN, Hussain S, Shaikh SR, Tighe RM, Gowdy KM. Scavenger receptor BI attenuates oxidized phospholipid-induced pulmonary inflammation. Toxicol Appl Pharmacol 2023; 462:116381. [PMID: 36681128 PMCID: PMC9983330 DOI: 10.1016/j.taap.2023.116381] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 12/30/2022] [Accepted: 01/11/2023] [Indexed: 01/20/2023]
Abstract
Damage associated molecular patterns (DAMPs) are molecules released from dead/dying cells following toxicant and/or environmental exposures that activate the immune response through binding of pattern recognition receptors (PRRs). Excessive production of DAMPs or failed clearance leads to chronic inflammation and delayed inflammation resolution. One category of DAMPs are oxidized phospholipids (oxPLs) produced upon exposure to high levels of oxidative stress, such as following ozone (O3) induced inflammation. OxPLs are bound by multiple classes of PRRs that include scavenger receptors (SRs) such as SR class B-1 (SR-BI) and toll-like receptors (TLRs). Interactions between oxPLs and PRRs appear to regulate inflammation; however, the role of SR-BI in oxPL-induced lung inflammation has not been defined. Therefore, we hypothesize that SR-BI is critical in protecting the lung from oxPL-induced pulmonary inflammation/injury. To test this hypothesis, C57BL/6J (WT) female mice were dosed with oxidized 1-palmitoyl-2-arachidonoyl-sn-glycero-3-phosphatidylcholine (oxPAPC) by oropharyngeal aspiration which increased pulmonary SR-BI expression. Following oxPAPC exposure, SR-BI deficient (SR-BI-/-) mice exhibited increased lung pathology and inflammatory cytokine/chemokine production. Lipidomic analysis revealed that SR-BI-/- mice had an altered pulmonary lipidome prior to and following oxPAPC exposure, which correlated with increased oxidized phosphatidylcholines (PCs). Finally, we characterized TLR4-mediated activation of NF-κB following oxPAPC exposure and discovered that SR-BI-/- mice had increased TLR4 mRNA expression in lung tissue and macrophages, increased nuclear p65, and decreased cytoplasmic IκBα. Overall, we conclude that SR-BI is required for limiting oxPAPC-induced lung pathology by maintaining lipid homeostasis, reducing oxidized PCs, and attenuating TLR4-NF-κB activation, thereby preventing excessive and persistent inflammation.
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Affiliation(s)
- Katelyn Dunigan-Russell
- Pulmonary, Critical Care and Sleep Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Michael J Yaeger
- Pulmonary, Critical Care and Sleep Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Myles X Hodge
- Department of Pharmacology and Toxicology, East Carolina University, Greenville, NC, United States
| | - Brita Kilburg-Basnyat
- Department of Pharmacology and Toxicology, East Carolina University, Greenville, NC, United States
| | - Sky W Reece
- Department of Pharmacology and Toxicology, East Carolina University, Greenville, NC, United States
| | - Anastasiya Birukova
- Department of Medicine, Duke University Medical Center, Durham, NC, United States
| | - Marissa A Guttenberg
- Department of Medicine, Duke University Medical Center, Durham, NC, United States
| | - Caymen Novak
- Pulmonary, Critical Care and Sleep Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Sangwoon Chung
- Pulmonary, Critical Care and Sleep Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Brandie Michelle Ehrmann
- Deparment of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - E Diane Wallace
- Deparment of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Debra Tokarz
- Experimental Pathology Laboratories, Inc., Research Triangle Park, NC, United States
| | - Nairrita Majumder
- Department of Physiology and Pharmacology, West Virginia University, Morgantown, WV, United States
| | - Li Xia
- College of Human and Health Sciences, Purdue University, West Lafayette, IN, United States
| | - John W Christman
- Pulmonary, Critical Care and Sleep Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Jonathan Shannahan
- College of Human and Health Sciences, Purdue University, West Lafayette, IN, United States
| | - Megan N Ballinger
- Pulmonary, Critical Care and Sleep Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, United States
| | - Salik Hussain
- Department of Physiology and Pharmacology, West Virginia University, Morgantown, WV, United States
| | - Saame Raza Shaikh
- Department of Nutrition, Gillings School of Global Public Health and School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Robert M Tighe
- Department of Medicine, Duke University Medical Center, Durham, NC, United States
| | - Kymberly M Gowdy
- Pulmonary, Critical Care and Sleep Medicine, The Ohio State University Wexner Medical Center, Columbus, OH, United States.
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9
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Wu CH, Guo L, Hao D, Wang Q, Ye X, Ito M, Huang B, Mineo C, Shaul PW, Li XA. Relative adrenal insufficiency is a risk factor and endotype of sepsis - A proof-of-concept study to support a precision medicine approach to guide glucocorticoid therapy for sepsis. Front Immunol 2023; 13:1110516. [PMID: 36713379 PMCID: PMC9878847 DOI: 10.3389/fimmu.2022.1110516] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 12/28/2022] [Indexed: 01/13/2023] Open
Abstract
Introduction 25-60% of septic patients experience relative adrenal insufficiency (RAI) and glucocorticoid (GC) is frequently used in septic patients. However, the efficacy of GC therapy and whether GC therapy should be based on the status of RAI are highly controversial. Our poor understanding about the pathogenesis of RAI and a lack of RAI animal model present significant barriers to address these critical issues. Methods Scavenger receptor BI (SR-BI) regulates stress-induced GC (iGC) production in response to stress. We generated SF1CreSR-BIfl/fl mice and utilized the mice as a RAI model to elucidate the pathogenesis of RAI and GC therapy in sepsis. SF1CreSR-BIfl/fl mice did not express SR-BI in adrenal gland and lacked iGC production upon ACTH stimulation, thus, they are RAI. Results and Discussion RAI mice were susceptible to cecal ligation and puncture (CLP)-induced sepsis (6.7% survival in SF1CreSR-BIfl/fl mice versus 86.4% in SR-BIfl/fl mice; p = 0.0001). Compared to a well-controlled systemic inflammatory response in SR-BIfl/fl mice, SF1CreSR-BIfl/fl mice featured a persistent hyperinflammatory response. Supplementation of a low stress dose of GC to SF1CreSR-BIfl/fl mice kept the inflammatory response under control and rescued the mice. However, SR-BIfl/fl mice receiving GC treatment exhibited significantly less survival compared to SR-BIfl/fl mice without GC treatment. In conclusions, we demonstrated that RAI is a risk factor for death in this mouse model of sepsis. We further demonstrated that RAI is an endotype of sepsis, which features persistent hyperinflammatory response. We found that GC treatment benefits mice with RAI but harms mice without RAI. Our study provides a proof of concept to support a precision medicine approach for sepsis therapy - selectively applying GC therapy for a subgroup of patients with RAI.
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Affiliation(s)
- Chia-Hua Wu
- Department of Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY, United States
- Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, KY, United States
| | - Ling Guo
- Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, KY, United States
| | - Dan Hao
- Department of Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY, United States
| | - Qian Wang
- Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, KY, United States
| | - Xiang Ye
- Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, KY, United States
| | - Misa Ito
- Department of Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY, United States
| | - Bin Huang
- Division of Cancer Biostatistics, Department of Internal Medicine, University of Kentucky College of Medicine, Lexington, KY, United States
| | - Chieko Mineo
- Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Philip W. Shaul
- Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, United States
| | - Xiang-An Li
- Department of Pharmacology and Nutritional Sciences, University of Kentucky College of Medicine, Lexington, KY, United States
- Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, KY, United States
- Lexington Veterans Affairs (VA), Healthcare System, Lexington, KY, United States
- Department of Physiology, University of Kentucky College of Medicine, Lexington, KY, United States
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10
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Analysis of Intestinal Metabolites in SR-B1 Knockout Mice via Ultra-Performance Liquid Chromatography Quadrupole Time-of-Flight Mass Spectrometry. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28020610. [PMID: 36677669 PMCID: PMC9866485 DOI: 10.3390/molecules28020610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/03/2022] [Revised: 12/29/2022] [Accepted: 01/03/2023] [Indexed: 01/11/2023]
Abstract
Scavenger receptor class B type 1 (SR-B1), a multiligand membrane receptor, is expressed in a gradient along the gastrocolic axis. SR-B1 deficiency enhances lymphocyte proliferation and elevates inflammatory cytokine production in macrophages. However, whether SR-B1 affects intestinal metabolites is unclear. In this study, we detected metabolite changes in the intestinal tissue of SR-B1-/- mice, including amino acids and neurotransmitters, by ultra-performance liquid chromatography quadrupole time-of-flight mass spectrometry (UHPLC-Q-TOF/MS) and HPLC. We found that SR-B1-/- mice exhibited changes in intestinal lipid metabolites and metabolic pathways, including the glycerophospholipid, sphingolipid, linoleic acid, taurine, and hypotaurine metabolic pathways. SR-B1 deficiency influenced the contents of amino acids and neurotransmitters in all parts of the intestine; the contents of leucine (LEU), phenylalanine (PHE), tryptophan (TRP), and tyrosine (TYR) were affected in all parts of the intestine; and the contents of 3,4-dihydroxyphenylacetic acid (DOPAC) and dopamine (DA) were significantly decreased in both the colon and rectum. In summary, SR-B1 deficiency regulated intestinal lipids, amino acids, and neurotransmitter metabolism in mice.
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11
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Huang H, Li Z, Huang J, Xie Y, Xiao Z, Hu Y, Chen G, Wang M, Li Z, Chen Q, Zhu W, Su W, Luo Y, Chen X, Liang D. Apolipoprotein A1 Modulates Teff/Treg Balance Through Scavenger Receptor Class B Type I-Dependent Mechanisms in Experimental Autoimmune Uveitis. Invest Ophthalmol Vis Sci 2022; 63:23. [PMID: 35881406 PMCID: PMC9339694 DOI: 10.1167/iovs.63.8.23] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Purpose Experimental autoimmune uveitis (EAU) is a representative animal model of human uveitis. In this study, we investigated whether apolipoprotein A1 (APOA1) can alleviate EAU and explored its underlying mechanism. Methods Mice were immunized with interphotoreceptor retinoid-binding protein 1-20 and treated with APOA1 or vehicle. The retinas, draining lymph nodes (DLNs), and spleens were analyzed. Isolated T cells were used for proliferation, differentiation, and function assays in vitro. Selective inhibitors and pathway agonists were used to study signaling pathways. The effect of APOA1 on peripheral blood mononuclear cells (PBMCs) from uveitis patients was also examined. Results Administration of APOA1 ameliorated EAU. APOA1 suppressed pathogenic CD4+ T cell expansion in DLNs and spleen, and decreased the infiltration of effector T (Teff) cells into retina. APOA1 also inhibited T cell proliferation and T helper 1 cell differentiation in vitro and promoted regulatory T (Treg) cell differentiation. APOA1 restricted inflammatory cytokine production from lipopolysaccharide-stimulated PBMCs. Mechanistic studies revealed that the effect of APOA1 was mediated by scavenger receptor class B type I (SR-BI) and downstream signals including phosphatidylinositol 3-kinase/Protein kinase B (PKB, or Akt), p38 mitogen-activated protein kinase, and nuclear factor–κB. Conclusions APOA1 ameliorates EAU by regulating the Teff/Treg partially through SR-BI. Our results suggest that APOA1 can be a therapeutic alternative for autoimmune uveitis.
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Affiliation(s)
- Haixiang Huang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Zhuang Li
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Jun Huang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Yanyan Xie
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Zhiqiang Xiao
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Yunwei Hu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Guanyu Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Minzhen Wang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Zuoyi Li
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Qian Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Wenjie Zhu
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Wenru Su
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Yan Luo
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Xiaoqing Chen
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
| | - Dan Liang
- State Key Laboratory of Ophthalmology, Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangdong Provincial Key Laboratory of Ophthalmology and Visual Science, Guangzhou, China
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12
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Grao-Cruces E, Lopez-Enriquez S, Martin ME, Montserrat-de la Paz S. High-density lipoproteins and immune response: A review. Int J Biol Macromol 2022; 195:117-123. [PMID: 34896462 DOI: 10.1016/j.ijbiomac.2021.12.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 12/01/2021] [Accepted: 12/02/2021] [Indexed: 01/04/2023]
Abstract
High-density lipoproteins (HDLs) are heterogeneous lipoproteins that modify their composition and functionality depending on physiological or pathological conditions. The main roles of HDL are cholesterol efflux, and anti-inflammatory and antioxidant functions. These functions can be compromised under pathological conditions. HDLs play a role in the immune system as anti-inflammatory molecules but when inflammation occurs, HDLs change their composition and carry pro-inflammatory cargo. Hence, many molecular intermediates that influence inflammatory microenvironments and cell signaling pathways can modulate HDLs structural modification and function. This review provides a comprehensive assessment of the importance of HDL composition and anti-inflammatory function in the onset and progression of atherosclerotic cardiovascular diseases. On the other hand, immune cell activation during progression of atheroma plaque formation can be influenced by HDLs through HDL-derived cholesterol depletion from lipid rafts and through HDL interaction with HDL receptors expressed on T and B lymphocytes. Cholesterol efflux is mediated by HDL receptors located in lipid rafts in peripheral cells, which undergo membrane structural modifications, and interferes with subsequent molecules interactions or intracellular signaling cascades. Regarding antigen-presentation cells such as macrophages or dendritic cells, HDL function may then modulate lymphocytes activation in immune response. Our review also contributes to the understanding of the effects exerted by HDLs in signal transduction associated to our immune cell population during chronic diseases progression.
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Affiliation(s)
- Elena Grao-Cruces
- Department of Medical Biochemistry, Molecular Biology, and Immunology, School of Medicine, University of Seville, Av. Sanchez Pizjuan s/n, 41009 Seville, Spain
| | - Soledad Lopez-Enriquez
- Department of Medical Biochemistry, Molecular Biology, and Immunology, School of Medicine, University of Seville, Av. Sanchez Pizjuan s/n, 41009 Seville, Spain
| | - Maria E Martin
- Department of Cell Biology, Faculty of Biology, University of Seville, Av. Reina Mercedes s/n, 41012 Seville, Spain
| | - Sergio Montserrat-de la Paz
- Department of Medical Biochemistry, Molecular Biology, and Immunology, School of Medicine, University of Seville, Av. Sanchez Pizjuan s/n, 41009 Seville, Spain.
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13
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Yu H. HDL and Scavenger Receptor Class B Type I (SRBI). ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1377:79-93. [DOI: 10.1007/978-981-19-1592-5_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Pinzon Grimaldos A, Bini S, Pacella I, Rossi A, Di Costanzo A, Minicocci I, D’Erasmo L, Arca M, Piconese S. The role of lipid metabolism in shaping the expansion and the function of regulatory T cells. Clin Exp Immunol 2021; 208:181-192. [PMID: 35020862 PMCID: PMC9188345 DOI: 10.1093/cei/uxab033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 12/05/2021] [Accepted: 12/10/2021] [Indexed: 12/16/2022] Open
Abstract
Metabolic inflammation, defined as a chronic low-grade inflammation, is implicated in numerous metabolic diseases. In recent years, the role of regulatory T cells (Tregs) as key controllers of metabolic inflammation has emerged, but our comprehension on how different metabolic pathways influence Treg functions needs a deeper understanding. Here we focus on how circulating and intracellular lipid metabolism, in particular cholesterol metabolism, regulates Treg homeostasis, expansion, and functions. Cholesterol is carried through the bloodstream by circulating lipoproteins (chylomicrons, very low-density lipoproteins, low-density lipoproteins). Tregs are equipped with a wide array of metabolic sensors able to perceive and respond to changes in the lipid environment through the activation of different intracellular pathways thus conferring to these cells a crucial metabolic and functional plasticity. Nevertheless, altered cholesterol transport, as observed in genetic dyslipidemias and atherosclerosis, impairs Treg proliferation and function through defective cellular metabolism. The intracellular pathway devoted to the cholesterol synthesis is the mevalonate pathway and several studies have shown that this pathway is essential for Treg stability and suppressive activity. High cholesterol concentrations in the extracellular environment may induce massive accumulation of cholesterol inside the cell thus impairing nutrients sensors and inhibiting the mevalonate pathway. This review summarizes the current knowledge regarding the role of circulating and cellular cholesterol metabolism in the regulation of Treg metabolism and functions. In particular, we will discuss how different pathological conditions affecting cholesterol transport may affect cellular metabolism in Tregs.
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Affiliation(s)
| | | | - Ilenia Pacella
- Department of Internal Clinical, Anesthesiological and Cardiovascular Sciences, Sapienza University of Rome, Rome, Italy
| | - Alessandra Rossi
- Department of Internal Clinical, Anesthesiological and Cardiovascular Sciences, Sapienza University of Rome, Rome, Italy
| | - Alessia Di Costanzo
- Department of Translational and Precision Medicine, Sapienza University of Rome, Policlinico Umberto I, Rome, Italy
| | - Ilenia Minicocci
- Department of Translational and Precision Medicine, Sapienza University of Rome, Policlinico Umberto I, Rome, Italy
| | - Laura D’Erasmo
- Department of Translational and Precision Medicine, Sapienza University of Rome, Policlinico Umberto I, Rome, Italy
| | - Marcello Arca
- Department of Translational and Precision Medicine, Sapienza University of Rome, Policlinico Umberto I, Rome, Italy
| | - Silvia Piconese
- Correspondence: Silvia Piconese, Department of Internal Clinical, Anesthesiological and Cardiovascular Sciences, Sapienza University of Rome, Rome, Italy.
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15
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Abstract
PURPOSE OF REVIEW This study reviews the mechanisms of HDL cholesterol immunomodulation in the context of the mechanisms of chronic inflammation and immunosuppression causing persistent inflammation, immunosuppression and catabolism syndrome (PICS) and describes potential therapies and gaps in current research. RECENT FINDINGS Low HDL cholesterol is predictive of acute sepsis severity and outcome. Recent research has indicated apolipoprotein is a prognostic indicator of long-term outcomes. The pathobiologic mechanisms of PICS have been elucidated in the past several years. Recent research of the interaction of HDL pathways in related chronic inflammatory diseases may provide insights into further mechanisms and therapeutic targets. SUMMARY HDL significantly influences innate and adaptive immune pathways relating to chronic disease and inflammation. Further research is needed to better characterize these interactions in the setting of PICS.
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Affiliation(s)
- Grant Barker
- Department of Emergency Medicine, University of Florida College of Medicine, Jacksonville
| | - Julia R Winer
- University of Florida College of Medicine, Gainesville, Florida
| | - Faheem W Guirgis
- Department of Emergency Medicine, University of Florida College of Medicine, Jacksonville
| | - Srinivasa Reddy
- Department of Molecular and Medical Pharmacology, University of California, Los Angeles, California, USA
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16
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Fernandes das Neves M, Batuca JR, Delgado Alves J. The role of high-density lipoprotein in the regulation of the immune response: implications for atherosclerosis and autoimmunity. Immunology 2021; 164:231-241. [PMID: 33934336 PMCID: PMC8442240 DOI: 10.1111/imm.13348] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2020] [Revised: 03/29/2021] [Accepted: 04/16/2021] [Indexed: 12/21/2022] Open
Abstract
Inflammation and immune dysfunction have been increasingly recognized as crucial mechanisms in atherogenesis. Modifications in cell lipid metabolism, plasma dyslipidaemia and particularly low high-density lipoprotein (HDL) levels occur both in atherosclerosis and in autoimmune rheumatic diseases (which are strongly associated with an increased risk of atherosclerosis), suggesting the presence of a crucial link. HDL, the plasma lipoprotein responsible for reverse cholesterol transport, is known for its several protective effects in the context of atherosclerosis. Among these, HDL immunomodulatory effects are possibly the less understood. Through the efflux of cholesterol from plasma cell membranes with the consequent disruption of lipid rafts and the interaction with the cholesterol transporters present in the plasma membrane, HDL affects both the innate and adaptive immune responses. Animal and human studies have demonstrated a predominance of HDL anti-inflammatory effects, despite some pro-inflammatory actions having also been reported. The HDL role on the modulation of the immune response is further suggested by the detection of low levels together with a dysfunctional HDL in patients with autoimmune diseases. Here, we review the current knowledge of the immune mechanisms of atherosclerosis and the modulatory effects HDL may have on them.
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Affiliation(s)
- Marisa Fernandes das Neves
- Center of the Study of Chronic DiseasesNew University of LisbonLisbonPortugal
- Medicine 4 DepartmentFernando Fonseca HospitalAmadoraPortugal
| | - Joana R. Batuca
- Center of the Study of Chronic DiseasesNew University of LisbonLisbonPortugal
| | - José Delgado Alves
- Center of the Study of Chronic DiseasesNew University of LisbonLisbonPortugal
- Medicine 4 DepartmentFernando Fonseca HospitalAmadoraPortugal
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17
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Baranova IN, Bocharov AV, Vishnyakova TG, Chen Z, Birukova AA, Ke Y, Hu X, Yuen PST, Star RA, Birukov KG, Patterson AP, Eggerman TL. Class B Scavenger Receptors BI and BII Protect against LPS-Induced Acute Lung Injury in Mice by Mediating LPS. Infect Immun 2021; 89:e0030121. [PMID: 34097506 PMCID: PMC8445172 DOI: 10.1128/iai.00301-21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Accepted: 05/28/2021] [Indexed: 12/15/2022] Open
Abstract
Recent studies suggest an anti-inflammatory protective role for class B scavenger receptor BI (SR-BI) in endotoxin-induced inflammation and sepsis. Other data, including ours, provide evidence for an alternative role of SR-BI, facilitating bacterial and endotoxin uptake and contributing to inflammation and bacterial infection. Enhanced endotoxin susceptibility of SR-BI-deficient mice due to their anti-inflammatory glucocorticoid deficiency complicates the understanding of SR-BI's role in endotoxemia/sepsis, calling for the use of alternative models. In this study, using human SR-BI (hSR-BI) and hSR-BII transgenic mice, we found that SR-BI and, to a lesser extent, its splicing variant SR-BII protect against LPS-induced lung damage. At 20 h after intratracheal LPS instillation, the extent of pulmonary inflammation and vascular leakage was significantly lower in hSR-BI and hSR-BII transgenic mice than in wild-type mice. Higher bronchoalveolar lavage fluid (BALF) inflammatory cell count and protein content and lung tissue neutrophil infiltration found in wild-type mice were associated with markedly (2 to 3 times) increased proinflammatory cytokine production compared to these parameters in transgenic mice following LPS administration. The markedly lower endotoxin levels detected in BALF of transgenic versus wild-type mice and the significantly increased BODIPY-LPS uptake observed in lungs of hSR-BI and hSR-BII mice 20 h after the i.t. LPS injection suggest that hSR-BI- and hSR-BII-mediated enhanced LPS clearance in the airways could represent the mechanism of their protective role against LPS-induced acute lung injury.
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Affiliation(s)
- Irina N. Baranova
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
| | - Alexander V. Bocharov
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
| | - Tatyana G. Vishnyakova
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
| | - Zhigang Chen
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
| | - Anna A. Birukova
- Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Yunbo Ke
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Xuzhen Hu
- Renal Diagnostics and Therapeutics Unit, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Peter S. T. Yuen
- Renal Diagnostics and Therapeutics Unit, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Robert A. Star
- Renal Diagnostics and Therapeutics Unit, National Institute of Diabetes, Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Konstantin G. Birukov
- Department of Anesthesiology, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Amy P. Patterson
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
- National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, USA
| | - Thomas L. Eggerman
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, Maryland, USA
- National Institute of Diabetes, Digestive, and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, USA
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18
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Luo A, Jing H, Yuan L, Wang Y, Xiao H, Zheng Q. Loss of Function of Scavenger Receptor SCAV-5 Protects C. elegans Against Pathogenic Bacteria. Front Cell Infect Microbiol 2021; 11:593745. [PMID: 34414127 PMCID: PMC8370389 DOI: 10.3389/fcimb.2021.593745] [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] [Received: 10/09/2020] [Accepted: 07/08/2021] [Indexed: 11/13/2022] Open
Abstract
Scavenger receptors play a critical role in innate immunity by acting as the pattern-recognition receptors. There are six class B scavenger receptors homologs in C. elegans. However, it remains unclear whether they are required for host defense against bacterial pathogens. Here, we show that, of the six SCAV proteins, only loss of function scav-5 protect C. elegans against pathogenic bacteria S. typhimurium SL1344 and P. aeruginosa PA14 by different mechanism. scav-5 mutants are resistant to S. typhimurium SL1344 due to dietary restriction. While scav-5 acts upstream of or in parallel to tir-1 in conserved PMK-1 p38 MAPK pathway to upregulate the innate immune response to defend worms against P. aeruginosa PA14. This is the first demonstration of a role for SCAV-5 in host defense against pathogenic bacteria. Our results provide an important basis for further elucidating the underlying molecular mechanism by which scav-5 regulates innate immune responses.
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Affiliation(s)
- Aixiao Luo
- Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Huiru Jing
- Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Lei Yuan
- Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Yanzhe Wang
- Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Hui Xiao
- Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an, China
| | - Qian Zheng
- Key Laboratory of the Ministry of Education for Medicinal Plant Resources and Natural Pharmaceutical Chemistry, National Engineering Laboratory for Resource Development of Endangered Crude Drugs in the Northwest of China, College of Life Sciences, Shaanxi Normal University, Xi'an, China
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19
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Fernandes das Neves M, Jury EC, Delgado Alves J. High density lipoprotein influences CD4 T cell proliferation in Systemic Lupus Erythematosus and increases TGF-β1 expression: A potential role in the protection from atherosclerosis and autoimmunity. Lupus 2021; 30:2019-2021. [PMID: 34284678 DOI: 10.1177/09612033211034557] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Marisa Fernandes das Neves
- Center of the Study of Chronic Diseases, New University of Lisbon, Lisbon, Portugal.,Medicine 4 Department, Fernando Fonseca Hospital, Amadora, Portugal
| | - Elisabeth C Jury
- Department of Inflammation, University College London, London, UK
| | - José Delgado Alves
- Center of the Study of Chronic Diseases, New University of Lisbon, Lisbon, Portugal.,Medicine 4 Department, Fernando Fonseca Hospital, Amadora, Portugal
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20
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Tenesaca S, Vasquez M, Fernandez-Sendin M, Di Trani CA, Ardaiz N, Gomar C, Cuculescu D, Alvarez M, Otano I, Melero I, Berraondo P. Scavenger Receptor Class B Type I is Required for 25-Hydroxycholecalciferol Cellular Uptake and Signaling in Myeloid Cells. Mol Nutr Food Res 2020; 64:e1901213. [PMID: 32583974 DOI: 10.1002/mnfr.201901213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 06/01/2020] [Indexed: 11/12/2022]
Abstract
SCOPE Vitamin D3 is a critical molecule for the properly controlled activity of the immune system. In myeloid-derived cells, vitamin D3 induces the production of the antimicrobial and antitumor peptide cathelicidin. In this study, the mechanism of the entry of 25-hydroxycholecalciferol (25(OH)D) in myeloid-derived cells is explored. METHODS AND RESULTS Here, a novel regulatory pathway of vitamin D3 biology is described. Using a polyclonal antibody, two different chemical inhibitors, and a high-density lipoprotein as a competing ligand, it is demonstrated here that the 25(OH)D signaling pathway in myeloid cells depends on scavenger receptor class B type I (SR-B1). This effect is observed in the THP-1 monocytic cell line and in human primary monocytes. SR-B1 blockade abrogates the cellular uptake of 25(OH)D leading to a general shut down of the gene transcription program modulated by 25(OH)D. The results obtained at the transcriptional level are confirmed at the protein and functional level for CD14 in the THP-1 cell line. CONCLUSION In conclusion, SR-B1 plays a critical role in vitamin D3 biology, paving the way for novel therapeutic interventions.
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Affiliation(s)
- Shirley Tenesaca
- Program of Immunology and Immunotherapy, Cima Universidad de Navarra, Pamplona, 31008, Spain.,Navarra Institute for Health Research (IDISNA), Pamplona, 31008, Spain
| | - Marcos Vasquez
- Program of Immunology and Immunotherapy, Cima Universidad de Navarra, Pamplona, 31008, Spain.,Navarra Institute for Health Research (IDISNA), Pamplona, 31008, Spain
| | - Myriam Fernandez-Sendin
- Program of Immunology and Immunotherapy, Cima Universidad de Navarra, Pamplona, 31008, Spain.,Navarra Institute for Health Research (IDISNA), Pamplona, 31008, Spain
| | - Claudia Augusta Di Trani
- Program of Immunology and Immunotherapy, Cima Universidad de Navarra, Pamplona, 31008, Spain.,Navarra Institute for Health Research (IDISNA), Pamplona, 31008, Spain
| | - Nuria Ardaiz
- Program of Immunology and Immunotherapy, Cima Universidad de Navarra, Pamplona, 31008, Spain.,Navarra Institute for Health Research (IDISNA), Pamplona, 31008, Spain
| | - Celia Gomar
- Program of Immunology and Immunotherapy, Cima Universidad de Navarra, Pamplona, 31008, Spain.,Navarra Institute for Health Research (IDISNA), Pamplona, 31008, Spain
| | - Doina Cuculescu
- Program of Immunology and Immunotherapy, Cima Universidad de Navarra, Pamplona, 31008, Spain.,Navarra Institute for Health Research (IDISNA), Pamplona, 31008, Spain
| | - Maite Alvarez
- Program of Immunology and Immunotherapy, Cima Universidad de Navarra, Pamplona, 31008, Spain.,Navarra Institute for Health Research (IDISNA), Pamplona, 31008, Spain
| | - Itziar Otano
- Program of Immunology and Immunotherapy, Cima Universidad de Navarra, Pamplona, 31008, Spain.,Navarra Institute for Health Research (IDISNA), Pamplona, 31008, Spain
| | - Ignacio Melero
- Program of Immunology and Immunotherapy, Cima Universidad de Navarra, Pamplona, 31008, Spain.,Navarra Institute for Health Research (IDISNA), Pamplona, 31008, Spain.,Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Madrid, 31008, Spain.,Department of Oncology, Clínica Universidad de Navarra, Pamplona, 31008, Spain
| | - Pedro Berraondo
- Program of Immunology and Immunotherapy, Cima Universidad de Navarra, Pamplona, 31008, Spain.,Navarra Institute for Health Research (IDISNA), Pamplona, 31008, Spain.,Centro de Investigación Biomédica en Red de Cáncer (CIBERONC), Madrid, 31008, Spain
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21
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Li C, Ge X, Su B, Fu Q, Wang B, Liu X, Ren Y, Song L, Yang N. Characterization of class B scavenger receptor type 1 (SRB1) in turbot (Scophthalmus maximus L.). FISH & SHELLFISH IMMUNOLOGY 2020; 100:358-367. [PMID: 32169665 DOI: 10.1016/j.fsi.2020.03.014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 03/05/2020] [Accepted: 03/06/2020] [Indexed: 06/10/2023]
Abstract
Class B scavenger receptor type 1 (SRB1) serves as a high-density lipoprotein (HDL) receptor essential for HDL metabolism, and plays vital roles in innate immunity. In this study, the turbot (Scophthalmus maximus) SRB1 was cloned and characterized. The gene structure consists of a coding region of 1,527 bp nucleotides dividing into 13 exons and 12 introns. Such genome structure is highly conserved among teleost fishes. The deduced SRB1 encodes 508 amino acids that mainly has a CD36 transmembrane domain. Tissue distribution of SRB1 showed the lowest expression in liver, while the highest expression was found in intestine. Significantly down-regulation pattern of SmSRB1 expression in intestine was shared after infection with Vibrio anguillarum and Streptococcus iniae. Brach and site models in CODEML program showed that SmSRB1 underwent a conservative evolutionary and three potential positive selected sites 470K, 496E, and 501Y were detected, which requires further investigation and confirmation using base-editing technologies. Subcellular localization demonstrated that turbot SRB1 was distributed in the membrane and cytoplasm. rSmSRB1 showed binding ability in vitro to bacteria, LPS, PGN, LTA and virus. Protein-protein interaction network agrees the function of SRB1 as lipoprotein receptor. Our results indicated SmSRB1 might act as co-receptors to TLRs and NLRs to modulate the immune response to pathogens. Further studies should pay attention to evaluate the specific co-receptor for SRB1 in recognition of different pathogens and selective mechanisms involved.
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Affiliation(s)
- Chao Li
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Xuefeng Ge
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Baofeng Su
- School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, AL, 36849, USA
| | - Qiang Fu
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Beibei Wang
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Xiaoli Liu
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Yichao Ren
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
| | - Lin Song
- College of Marine Science and Biological Engineering, Qingdao University of Science & Technology, Qingdao, 266011, China
| | - Ning Yang
- School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China.
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22
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Wang D, Huang J, Gui T, Yang Y, Feng T, Tzvetkov NT, Xu T, Gai Z, Zhou Y, Zhang J, Atanasov AG. SR-BI as a target of natural products and its significance in cancer. Semin Cancer Biol 2020; 80:18-38. [PMID: 31935456 DOI: 10.1016/j.semcancer.2019.12.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 11/25/2019] [Accepted: 12/30/2019] [Indexed: 02/07/2023]
Abstract
Scavenger receptor class B type I (SR-BI) protein is an integral membrane glycoprotein. SR-BI is emerging as a multifunctional protein, which regulates autophagy, efferocytosis, cell survival and inflammation. It is well known that SR-BI plays a critical role in lipoprotein metabolism by mediating cholesteryl esters selective uptake and the bi-directional flux of free cholesterol. Recently, SR-BI has also been identified as a potential marker for cancer diagnosis, prognosis, or even a treatment target. Natural products are a promising source for the discovery of new drug leads. Multiple natural products were identified to regulate SR-BI protein expression. There are still a number of challenges in modulating SR-BI expression in cancer and in using natural products for modulation of such protein expression. In this review, our purpose is to discuss the relationship between SR-BI protein and cancer, and the molecular mechanisms regulating SR-BI expression, as well as to provide an overview of natural products that regulate SR-BI expression.
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Affiliation(s)
- Dongdong Wang
- The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Fei Shan Jie 32, 550003, Guiyang, China
| | - Jiansheng Huang
- Department of Medicine, Vanderbilt University Medical Center, 318 Preston Research Building, 2200 Pierce Avenue, Nashville, Tennessee, 37232, USA
| | - Ting Gui
- Key Laboratory of Traditional Chinese Medicine for Classical Theory, Ministry of Education, Shandong University of Traditional Chinese Medicine, Jinan, 250355, China
| | - Yaxin Yang
- The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Fei Shan Jie 32, 550003, Guiyang, China
| | - Tingting Feng
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Huaxi university town, 550025, Guiyang, China
| | - Nikolay T Tzvetkov
- Department of Biochemical Pharmacology and Drug Design, Institute of Molecular Biology "Roumen Tsanev", Bulgarian Academy of Sciences, 21 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria
| | - Tao Xu
- The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Fei Shan Jie 32, 550003, Guiyang, China
| | - Zhibo Gai
- Department of Clinical Pharmacology and Toxicology, University Hospital Zurich, University of Zurich, Zurich, Switzerland
| | - Ying Zhou
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine, Huaxi university town, 550025, Guiyang, China.
| | - Jingjie Zhang
- The Second Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Fei Shan Jie 32, 550003, Guiyang, China.
| | - Atanas G Atanasov
- Department of Molecular Biology, Institute of Genetics and Animal Breeding of the Polish Academy of Sciences, 05-552, Jastrzębiec, Poland; Department of Pharmacognosy, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria; Institute of Neurobiology, Bulgarian Academy of Sciences, 23 Acad. G. Bonchev Str., 1113 Sofia, Bulgaria; Ludwig Boltzmann Institute for Digital Health and Patient Safety, Medical University of Vienna, Spitalgasse 23, 1090, Vienna, Austria.
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23
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Zheng Z, Ai J, Guo L, Ye X, Bondada S, Howatt D, Daugherty A, Li XA. SR-BI (Scavenger Receptor Class B Type 1) Is Critical in Maintaining Normal T-Cell Development and Enhancing Thymic Regeneration. Arterioscler Thromb Vasc Biol 2019; 38:2706-2717. [PMID: 30354229 DOI: 10.1161/atvbaha.118.311728] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Objective- Continuous T-cell production from thymus is essential in replenishing naïve T-cell pool and maintaining optimal T-cell functions. However, the underlying mechanisms regulating the T-cell development in thymus remains largely unknown. Approach and Results- We identified SR-BI (scavenger receptor class B type 1), an HDL (high-density lipoprotein) receptor, as a novel modulator in T-cell development. We found that SR-BI deficiency in mice led to reduced thymus size and decreased T-cell production, which was accompanied by narrowed peripheral naïve T-cell pool. Further investigation revealed that SR-BI deficiency impaired progenitor thymic homing, causing a dramatic reduction in the percentage of earliest thymic progenitors, but did not affect other downstream T-cell developmental steps inside the thymus. As a result of the impaired progenitor thymic homing, SR-BI-deficient mice displayed delayed thymic regeneration postirradiation. Using a variety of experimental approaches, we revealed that the impaired T-cell development in SR-BI-deficient mice was not caused by hematopoietic SR-BI deficiency or SR-BI deficiency-induced hypercholesterolemia, but mainly attributed to the SR-BI deficiency in adrenal glands, as adrenal-specific SR-BI-deficient mice exhibited similar defects in T-cell development and thymic regeneration with SR-BI-deficient mice. Conclusions- This study demonstrates that SR-BI deficiency impaired T-cell development and delayed thymic regeneration by affecting progenitor thymic homing in mice, elucidating a previously unrecognized link between SR-BI and adaptive immunity.
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Affiliation(s)
- Zhong Zheng
- From the Department of Pharmacology and Nutritional Sciences (Z.Z., J.A., X.-A.L.), University of Kentucky College of Medicine, Lexington.,Saha Cardiovascular Research Center (Z.Z., J.A., L.G., X.Y., D.H., A.D., X.-A.L.), University of Kentucky College of Medicine, Lexington
| | - Junting Ai
- From the Department of Pharmacology and Nutritional Sciences (Z.Z., J.A., X.-A.L.), University of Kentucky College of Medicine, Lexington.,Saha Cardiovascular Research Center (Z.Z., J.A., L.G., X.Y., D.H., A.D., X.-A.L.), University of Kentucky College of Medicine, Lexington
| | - Ling Guo
- Saha Cardiovascular Research Center (Z.Z., J.A., L.G., X.Y., D.H., A.D., X.-A.L.), University of Kentucky College of Medicine, Lexington
| | - Xiang Ye
- Saha Cardiovascular Research Center (Z.Z., J.A., L.G., X.Y., D.H., A.D., X.-A.L.), University of Kentucky College of Medicine, Lexington
| | - Subbarao Bondada
- Department of Microbiology (S.B.), University of Kentucky College of Medicine, Lexington
| | - Deborah Howatt
- Saha Cardiovascular Research Center (Z.Z., J.A., L.G., X.Y., D.H., A.D., X.-A.L.), University of Kentucky College of Medicine, Lexington
| | - Alan Daugherty
- Saha Cardiovascular Research Center (Z.Z., J.A., L.G., X.Y., D.H., A.D., X.-A.L.), University of Kentucky College of Medicine, Lexington.,Department of Physiology (A.D., X.-A.L.), University of Kentucky College of Medicine, Lexington
| | - Xiang-An Li
- From the Department of Pharmacology and Nutritional Sciences (Z.Z., J.A., X.-A.L.), University of Kentucky College of Medicine, Lexington.,Saha Cardiovascular Research Center (Z.Z., J.A., L.G., X.Y., D.H., A.D., X.-A.L.), University of Kentucky College of Medicine, Lexington.,Department of Physiology (A.D., X.-A.L.), University of Kentucky College of Medicine, Lexington
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24
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Shrivastava R, Shukla N. Attributes of alternatively activated (M2) macrophages. Life Sci 2019; 224:222-231. [PMID: 30928403 DOI: 10.1016/j.lfs.2019.03.062] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 03/21/2019] [Accepted: 03/25/2019] [Indexed: 01/22/2023]
Abstract
Macrophages are cells of innate immunity and are derived from circulating monocytes and embryonic yolk sac. They exhibit high plasticity and polarize functionally in response to stimulus triggering it into classically activated M1 macrophages and alternatively activated M2 macrophages. This review summarizes markers of M2 macrophages like transmembrane surface receptors and signaling cascades initiated on their activation; cytokine and chemokine repertoires along with their receptors; and genetic markers and their involvement in immunomodulation. The detailed discussion emphasizes the role of these markers in imparting functional benefits to this subset of macrophages which define their venture in various physiological and pathological conditions.
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Affiliation(s)
- Richa Shrivastava
- Department of Pharmacy, Birla Institute of Technology and Sciences (BITS), Pilani Campus, Pilani, Rajasthan 333031, India.
| | - Nidhi Shukla
- Division of Endocrinology, CSIR-Central Drug Research Institute (CDRI), Lucknow 226031, India
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25
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Madsen CM, Varbo A, Nordestgaard BG. Low HDL Cholesterol and High Risk of Autoimmune Disease: Two Population-Based Cohort Studies Including 117341 Individuals. Clin Chem 2019; 65:644-652. [PMID: 30745290 DOI: 10.1373/clinchem.2018.299636] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 01/22/2019] [Indexed: 11/06/2022]
Abstract
BACKGROUND HDL is quantitatively the most important lipoprotein in most species and mechanistic evidence points toward a role for HDL in normal immune function. We tested the hypothesis that concentrations of HDL cholesterol are associated with risk of autoimmune disease. METHODS From 2 studies of the general population-the Copenhagen General Population Study and the Copenhagen City Heart study-we included 107954 and 9387 individuals with baseline measurements of HDL cholesterol. These were followed with the national Danish Patient Registry from baseline in 2003-2015 or 1991-1994 through 2017, during which time 4078 and 1101 individuals developed autoimmune disease in the 2 studies. RESULTS In the Copenhagen General Population Study, compared to individuals with HDL cholesterol ≥2.0 mmol/L (77 mg/dL), the multifactorially adjusted hazard ratios for any autoimmune disease were 1.06 (95% CI, 0.94-1.19) for individuals with HDL cholesterol of 1.5-1.99 mmol/L (58-77 mg/dL), 1.18 (95% CI, 1.04-1.35) for individuals with HDL cholesterol of 1.0-1.49 mmol/L (39-58 mg/dL), and 1.84 (95% CI, 1.52-2.22) for individuals with HDL cholesterol <1.0 mmol/L (39 mg/dL) (P for trend <0.001). These results were similar when excluding events within 5 years of baseline, in women and men separately, for events at baseline, irrespective of low-grade inflammation or triglyceride concentrations, for the apolipoprotein A1 part of HDL, and for more restrictive end point definitions. Finally, the Copenhagen City Heart Study provided independent confirmation. CONCLUSIONS Low HDL cholesterol level is associated with high risk of autoimmune disease in individuals from the general population. Our observational findings cannot determine causality.
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Affiliation(s)
- Christian M Madsen
- Department of Clinical Biochemistry and.,The Copenhagen General Population Study, Herlev and Gentofte Hospital, Copenhagen University Hospital, Denmark.,Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Anette Varbo
- Department of Clinical Biochemistry and.,The Copenhagen General Population Study, Herlev and Gentofte Hospital, Copenhagen University Hospital, Denmark.,Faculty of Health and Medical Sciences, University of Copenhagen, Denmark
| | - Børge G Nordestgaard
- Department of Clinical Biochemistry and .,The Copenhagen General Population Study, Herlev and Gentofte Hospital, Copenhagen University Hospital, Denmark.,Faculty of Health and Medical Sciences, University of Copenhagen, Denmark.,The Copenhagen City Heart Study, Frederiksberg Hospital, Copenhagen University Hospital, Denmark
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26
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Haghikia A, Landmesser U. High-Density Lipoproteins: Effects on Vascular Function and Role in the Immune Response. Cardiol Clin 2018; 36:317-327. [PMID: 29609761 DOI: 10.1016/j.ccl.2017.12.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
The focus in studies of high-density lipoproteins was on their capacity to remove excess cholesterol and deliver it to the liver. Other functions and vascular effects have been described. Clinical trials and translational/genetic studies have led to a refined understanding of the role of high-density lipoprotein; it is likely not a causal cardiovascular risk factor. In healthy subjects, it limits lipid oxidation, protects endothelial cell functions/integrity, and exerts antiinflammatory/antiapoptotic effects. In patients with coronary disease or diabetes, it undergoes modifications/remodeling, resulting in dysfunctional high-density lipoprotein. We summarize recent findings about the regulation of its function and discuss the clinical implications.
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Affiliation(s)
- Arash Haghikia
- Department of Cardiology, Charité Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, Berlin 12203, Germany; German Center for Cardiovascular Research (DZHK), Partner Site Berlin, Postfach 65 21 33, Berlin 13316, Germany.
| | - Ulf Landmesser
- Department of Cardiology, Charité Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, Berlin 12203, Germany; German Center for Cardiovascular Research (DZHK), Partner Site Berlin, Postfach 65 21 33, Berlin 13316, Germany; Berlin Institute of Health (BIH), Anna-Louisa-Karsch-Straße 2, Berlin 10178, Germany
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27
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Wang X, Wu C, Yuan B, Wang D, Liu H, Feng H, Sun S. Low scavenger receptor class B type I expression is associated with gastric adenocarcinoma tumor aggressiveness. Oncol Lett 2018. [PMID: 29541232 DOI: 10.3892/ol.2018.7889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Scavenger receptor class B type I (SR-BI), a well-documented high-density lipoprotein receptor, has been implicated in the development and progression of human cancer. However, little is known regarding the expression profile and clinical value of SR-BI in gastric adenocarcinoma. In the present study immunohistochemistry analysis was performed on a well-annotated gastric adenocarcinoma tissue microarray to investigate the association between SR-BI expression and clinicopathological parameters or patient outcome. The results revealed that SR-BI expression was detected in 69% of the 84 gastric adenocarcinomas. Moreover, a significant association was observed between low SR-BI expression and poor histological grade, higher Tumor-Node-Metastasis T stage, higher N stage and diffuse type carcinoma. Low SR-BI expression was also significantly associated with a shorter overall survival time in patients with gastric adenocarcinoma, although it was not an independent prognostic factor. Overall, the results of the present study demonstrated that SR-BI was possibly involved in gastric carcinogenesis and could be used as a biomarker to predict malignancy of gastric adenocarcinoma.
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Affiliation(s)
- Xingwen Wang
- Cancer Center, Shandong Provincial Hospital Affiliated to Shandong University, Shandong University, Jinan, Shandong 250021, P.R. China
| | - Changshun Wu
- Department of Bone and Joint Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Shandong University, Jinan, Shandong 250021, P.R. China
| | - Baoying Yuan
- Cancer Center, Shandong Provincial Hospital Affiliated to Shandong University, Shandong University, Jinan, Shandong 250021, P.R. China
| | - Dan Wang
- Department of Central Laboratory, Shandong Provincial Hospital Affiliated to Shandong University, Shandong University, Jinan, Shandong 250021, P.R. China
| | - Huiling Liu
- Cancer Center, Shandong Provincial Hospital Affiliated to Shandong University, Shandong University, Jinan, Shandong 250021, P.R. China
| | - Hong Feng
- Cancer Center, Shandong Provincial Hospital Affiliated to Shandong University, Shandong University, Jinan, Shandong 250021, P.R. China
| | - Shui Sun
- Department of Bone and Joint Surgery, Shandong Provincial Hospital Affiliated to Shandong University, Shandong University, Jinan, Shandong 250021, P.R. China
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28
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Uemura Y, Hagiwara K, Kobayashi K. The intratracheal administration of locked nucleic acid containing antisense oligonucleotides induced gene silencing and an immune-stimulatory effect in the murine lung. PLoS One 2017; 12:e0187286. [PMID: 29107995 PMCID: PMC5673232 DOI: 10.1371/journal.pone.0187286] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2017] [Accepted: 10/17/2017] [Indexed: 12/21/2022] Open
Abstract
Locked nucleic acid containing antisense oligonucleotides (LNA-ASOs) have the potential to modulate the disease-related gene expression by the RNaseH-dependent degradation of mRNAs. Pulmonary drug delivery has been widely used for the treatment of lung disease. Thus, the inhalation of LNA-ASOs is expected to be an efficient therapy that can be applied to several types of lung disease. Because the lung has a distinct immune system against pathogens, the immune-stimulatory effect of LNA-ASOs should be considered for the development of novel inhaled LNA-ASOs therapies. However, there have been no reports on the relationship between knock-down (KD) and the immune-stimulatory effects of inhaled LNA-ASOs in the lung. In this report, LNA-ASOs targeting Scarb1 (Scarb1-ASOs) or negative control LNA-ASOs targeting ApoB (ApoB-ASOs) were intratracheally administered to mice to investigate the KD of the gene expression and the immune-stimulatory effects in the lung. We confirmed that the intratracheal administration of Scarb1-ASOs exerted a KD effect in the lung without a drug delivery system. On the other hand, both Scarb1-ASOs and ApoB-ASOs induced neutrophilic infiltration in the alveoli and increased the expression levels of G-CSF and CXCL1 in the lung. The dose required for KD was the same as the dose that induced the neutrophilic immune response. In addition, in our in vitro experiments, Scarb1-ASOs did not increase the G-CSF or CXCL1 expression in primary lung cells, even though Scarb1-ASOs exerted a strong KD effect. Hence, we hypothesize that inhaled LNA-ASOs have the potential to exert a KD effect in the lung, but that they may be associated with a risk of immune stimulation. Further studies about the mechanism underlying the immune-stimulatory effect of LNA-ASOs is necessary for the development of novel inhaled LNA-ASO therapies.
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Affiliation(s)
- Yasunori Uemura
- Immunology & Allergy R&D Unit, R&D Division, Kyowa Hakko Kirin Co., Ltd., Nagaizumi-cho, Shizuoka, Japan
- * E-mail:
| | - Kenji Hagiwara
- Innovative Technology Labs, Research Functions Unit, R&D Division, Kyowa Hakko Kirin Co., Ltd., Machida, Tokyo, Japan
| | - Katsuya Kobayashi
- Immunology & Allergy R&D Unit, R&D Division, Kyowa Hakko Kirin Co., Ltd., Nagaizumi-cho, Shizuoka, Japan
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29
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Zamanian-Daryoush M, Lindner DJ, DiDonato JA, Wagner M, Buffa J, Rayman P, Parks JS, Westerterp M, Tall AR, Hazen SL. Myeloid-specific genetic ablation of ATP-binding cassette transporter ABCA1 is protective against cancer. Oncotarget 2017; 8:71965-71980. [PMID: 29069761 PMCID: PMC5641104 DOI: 10.18632/oncotarget.18666] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Accepted: 05/23/2017] [Indexed: 02/07/2023] Open
Abstract
Increased circulating levels of apolipoprotein A-I (apoA-I), the major protein of high-density lipoprotein (HDL), by genetic manipulation or infusion, protects against melanoma growth and metastasis. Herein, we explored potential roles in melanoma tumorigenesis for host scavenger receptor class B, type 1 (SR-B1), and ATP-binding cassette transporters A1 (ABCA1) and G1 (ABCG1), all mediators of apoA-I and HDL sterol and lipid transport function. In a syngeneic murine melanoma tumor model, B16F10, mice with global deletion of SR-B1 expression exhibited increased plasma HDL cholesterol (HDLc) levels and decreased tumor volume, indicating host SR-B1 does not directly contribute to HDL-associated anti-tumor activity. In mice with myeloid-specific loss of ABCA1 (Abca1-M/-M ; A1-M/-M), tumor growth was inhibited by ∼4.8-fold relative to wild type (WT) animals. Abcg1-M/-M (G1-M/-M) animals were also protected by 2.5-fold relative to WT, with no further inhibition of tumor growth in Abca1/Abcg1 myeloid-specific double knockout animals (DKO). Analyses of tumor-infiltrating immune cells revealed a correlation between tumor protection and decreased presence of the immune suppressive myeloid-derived suppressor cell (MDSC) subsets, Ly-6G+Ly-6CLo and Ly-6GnegLy-6CHi cells. The growth of the syngeneic MB49 murine bladder cancer cells was also inhibited in A1-M/-M mice. Collectively, our studies provide further evidence for an immune modulatory role for cholesterol homeostasis pathways in cancer.
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Affiliation(s)
| | - Daniel J. Lindner
- Taussig Cancer Institute, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Joseph A. DiDonato
- Department of Cellular & Molecular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Matthew Wagner
- Department of Cellular & Molecular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Jennifer Buffa
- Department of Cellular & Molecular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA
| | - Patricia Rayman
- Department of Immunology, Cleveland Clinic, Cleveland, OH 44195, USA
| | - John S. Parks
- Department of Internal Medicine, Section on Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27157, USA
| | - Marit Westerterp
- Department of Medicine, Columbia University, College of Physicians and Surgeons 8-401, New York, NY 10032, USA
| | - Alan R. Tall
- Department of Medicine, Columbia University, College of Physicians and Surgeons 8-401, New York, NY 10032, USA
| | - Stanley L. Hazen
- Department of Cellular & Molecular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA
- Department of Cardiovascular Medicine, Cleveland Clinic, Cleveland, OH 44195, USA
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30
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Dysfunctional HDL in diabetes mellitus and its role in the pathogenesis of cardiovascular disease. Mol Cell Biochem 2017; 440:167-187. [PMID: 28828539 DOI: 10.1007/s11010-017-3165-z] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 08/16/2017] [Indexed: 12/17/2022]
Abstract
Coronary artery disease, the leading cause of death in the developed and developing countries, is prevalent in diabetes mellitus with 68% cardiovascular disease (CVD)-related mortality. Epidemiological studies suggested inverse correlation between HDL and CVD occurrence. Therefore, low HDL concentration observed in diabetic patients compared to non-diabetic individuals was thought to be one of the primary causes of increased risks of CVD. Efforts to raise HDL level via CETP inhibitors, Torcetrapib and Dalcetrapib, turned out to be disappointing in outcome studies despite substantial increases in HDL-C, suggesting that factors beyond HDL concentration may be responsible for the increased risks of CVD. Therefore, recent studies have focused more on HDL function than on HDL levels. The metabolic environment in diabetes mellitus condition such as hyperglycemia-induced advanced glycation end products, oxidative stress, and inflammation promote HDL dysfunction leading to greater risks of CVD. This review discusses dysfunctional HDL as one of the mechanisms of increased CVD risks in diabetes mellitus through adversely affecting components that support HDL function in cholesterol efflux and LDL oxidation. The dampening of reverse cholesterol transport, a key process that removes cholesterol from lipid-laden macrophages in the arterial wall, leads to increased risks of CVD in diabetic patients. Therapeutic approaches to keep diabetes under control may benefit patients from developing CVD.
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31
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Abstract
PURPOSE OF REVIEW Scavenger receptor BI (SR-BI) is classically known for its role in antiatherogenic reverse cholesterol transport as it selectively takes up cholesterol esters from HDL. Here, we have highlighted recent literature that describes novel functions for SR-BI in physiology and disease. RECENT FINDINGS A large population-based study has revealed that patients heterozygous for the P376L mutant form of SR-BI showed significantly increased levels of plasma HDL-cholesterol and had increased risk of cardiovascular disease, demonstrating that SR-BI in humans is a significant determinant of cardiovascular disease. Furthermore, SR-BI has been shown to modulate the susceptibility to LPS-induced tissue injury and the ability of sphingosine 1 phosphate to interact with its receptor, linking SR-BI to the regulation of inflammation. In addition, important domains within the molecule (Trp-415) as well as novel regulators (procollagen C-endopeptidase enhancer protein 2) of SR-BI's selective uptake function have recently been identified. Moreover, relatively high expression levels of the SR-BI protein have been observed in a variety of cancer tissues, which is associated with a reduced overall survival rate. SUMMARY The HDL receptor SR-BI is a potential therapeutic target not only in the cardiovascular disease setting, but also in inflammatory conditions as well as in cancer.
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Affiliation(s)
- Menno Hoekstra
- Division of Biopharmaceutics, Cluster BioTherapeutics, Leiden Academic Centre for Drug Research, Leiden, The Netherlands, , Tel: +31-71-5276582
| | - Mary Sorci-Thomas
- Division of Endocrinology, Associate in Pharmacology and Toxicology, Medical College of Wisconsin, Senior Adjunct Investigator at the Blood Research Institute, Blood Center of Wisconsin, , Tel: 414-955-5728
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32
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Rueda CM, Rodríguez-Perea AL, Moreno-Fernandez M, Jackson CM, Melchior JT, Davidson WS, Chougnet CA. High density lipoproteins selectively promote the survival of human regulatory T cells. J Lipid Res 2017; 58:1514-1523. [PMID: 28377425 DOI: 10.1194/jlr.m072835] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2016] [Revised: 04/03/2017] [Indexed: 01/05/2023] Open
Abstract
HDLs appear to affect regulatory T cell (Treg) homeostasis, as suggested by the increased Treg counts in HDL-treated mice and by the positive correlation between Treg frequency and HDL-cholesterol levels in statin-treated healthy adults. However, the underlying mechanisms remain unclear. Herein, we show that HDLs, not LDLs, significantly decreased the apoptosis of human Tregs in vitro, whereas they did not alter naïve or memory CD4+ T cell survival. Similarly, oleic acid bound to serum albumin increased Treg survival. Tregs bound and internalized high amounts of HDL compared with other subsets, which might arise from the higher expression of the scavenger receptor class B type I by Tregs; accordingly, blocking this receptor hindered HDL-mediated Treg survival. Mechanistically, we showed that HDL increased Treg ATP concentration and mitochondrial activity, enhancing basal respiration, maximal respiration, and spare respiratory capacity. Blockade of FA oxidation by etoxomir abolished the HDL-mediated enhanced survival and mitochondrial activity. Our findings thus suggest that Tregs can specifically internalize HDLs from their microenvironment and use them as an energy source. Furthermore, a novel implication of our data is that enhanced Treg survival may contribute to HDLs' anti-inflammatory properties.
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Affiliation(s)
- Cesar M Rueda
- Division of Immunobiology, Cincinnati Children's Hospital Research Foundation, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH
| | | | - Maria Moreno-Fernandez
- Division of Immunobiology, Cincinnati Children's Hospital Research Foundation, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH
| | - Courtney M Jackson
- Division of Immunobiology, Cincinnati Children's Hospital Research Foundation, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH
| | - John T Melchior
- Division of Experimental Pathology, Department of Pathology and Laboratory Medicine, University of Cincinnati, Cincinnati, OH
| | - W Sean Davidson
- Division of Experimental Pathology, Department of Pathology and Laboratory Medicine, University of Cincinnati, Cincinnati, OH
| | - Claire A Chougnet
- Division of Immunobiology, Cincinnati Children's Hospital Research Foundation, Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH.
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Hsu CS, Hsu SJ, Liu WL, Chen DS, Kao JH. Association of SCARB1 Gene Polymorphisms with Virological Response in Chronic Hepatitis C Patients Receiving Pegylated Interferon plus Ribavirin Therapy. Sci Rep 2016; 6:32303. [PMID: 27561198 PMCID: PMC4999819 DOI: 10.1038/srep32303] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2016] [Accepted: 08/05/2016] [Indexed: 12/26/2022] Open
Abstract
The scavenger receptor type B class I(SR-BI) is a receptor for high-density lipoproteins(HDL) and one of entry factors for hepatitis C virus(HCV). We examined the association of single nucleotide polymorphisms(SNPs) of the SCARB1 gene, which encodes SR-BI, with virologic responses to pegylated interferon-based treatment in Asian chronic hepatitis C(CHC) patients. Human genomic and clinical data were collected from 156 consecutive Taiwanese HCV genotype 1 or 2 patients who received pegylated interferon plus ribavirin therapy and 153 non-HCV healthy subjects. Three SNPs(rs10846744, rs5888, and rs3782287) of the SCARB1 gene that have been linked to humans diseases were investigated. rs10846744 rather than rs5888 or rs3782287 was associated with serum HCV RNA level and sustained virologic response(SVR) to pegylated interferon plus ribavirin therapy in CHC patients(GG vs. non-GG genotype, Adjusted Odds Ratio, 95% CI: 0.32, 0.11–0.95, P = 0.039). Among patients with IL28B rs8099917 non-TT genotypes, those with rs10846744 non-GG genotype had a higher SVR rate than those with GG genotypes. In addition, patients with GG genotype had a higher fasting blood glucose level than those with CC genotype. In conclusion, SCARB1 gene polymorphisms may serve as a potential predictor of treatment responses in CHC patients receiving interferon-based therapy. (ClinicalTrials.gov number, NCT02714712).
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Affiliation(s)
- Ching-Sheng Hsu
- Division of Gastroenterology, Department of Internal Medicine, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taipei, Taiwan.,School of Post-Baccalaureate Chinese Medicine, Tzu Chi University, Hualien, Taiwan.,School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Shih-Jer Hsu
- Department of Internal Medicine, National Taiwan University Hospital, Yun-Lin Branch, Yun-Lin County, Taiwan.,Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Wei-Liang Liu
- Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan
| | - Ding-Shinn Chen
- Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan.,Department of Internal Medicine, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei, Taiwan
| | - Jia-Horng Kao
- Graduate Institute of Clinical Medicine, National Taiwan University College of Medicine, Taipei, Taiwan.,Department of Internal Medicine, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei, Taiwan.,Department of Medical Research, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei, Taiwan.,Hepatitis Research Center, National Taiwan University College of Medicine and National Taiwan University Hospital, Taipei, Taiwan
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34
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Vasquez M, Fioravanti J, Aranda F, Paredes V, Gomar C, Ardaiz N, Fernandez-Ruiz V, Méndez M, Nistal-Villan E, Larrea E, Gao Q, Gonzalez-Aseguinolaza G, Prieto J, Berraondo P. Interferon alpha bioactivity critically depends on Scavenger receptor class B type I function. Oncoimmunology 2016; 5:e1196309. [PMID: 27622065 PMCID: PMC5007953 DOI: 10.1080/2162402x.2016.1196309] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Revised: 05/10/2016] [Accepted: 05/27/2016] [Indexed: 12/11/2022] Open
Abstract
Scavenger receptor class B type I (SR-B1) binds pathogen-associated molecular patterns participating in the regulation of the inflammatory reaction but there is no information regarding potential interactions between SR-B1 and the interferon system. Herein, we report that SR-B1 ligands strongly regulate the transcriptional response to interferon α (IFNα) and enhance its antiviral and antitumor activity. This effect was mediated by the activation of TLR2 and TLR4 as it was annulled by the addition of anti-TLR2 or anti-TLR4 blocking antibodies. In vivo, we maximized the antitumor activity of IFNα co-expressing in the liver a SR-B1 ligand and IFNα by adeno-associated viruses. This gene therapy strategy eradicated liver metastases from colon cancer with reduced toxicity. On the other hand, genetic and pharmacological inhibition of SR-B1 blocks the clathrin-dependent interferon receptor recycling pathway with a concomitant reduction in IFNα signaling and bioactivity. This effect can be applied to enhance cancer immunotherapy with oncolytic viruses. Indeed, SR-B1 antagonists facilitate replication of oncolytic viruses amplifying their tumoricidal potential. In conclusion, SR-B1 agonists behave as IFNα enhancers while SR-B1 inhibitors dampen IFNα activity. These results demonstrate that SR-B1 is a suitable pharmacology target to enhance cancer immunotherapy based on IFNα and oncolytic viruses.
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Affiliation(s)
- Marcos Vasquez
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA) , Pamplona, Navarra, Spain
| | - Jessica Fioravanti
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA) , Pamplona, Navarra, Spain
| | - Fernando Aranda
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA) , Pamplona, Navarra, Spain
| | - Vladimir Paredes
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA), Pamplona, Navarra, Spain; Centro Médico Nacional La Raza, IMSS, México DF, Mexico
| | - Celia Gomar
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA) , Pamplona, Navarra, Spain
| | - Nuria Ardaiz
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA) , Pamplona, Navarra, Spain
| | - Veronica Fernandez-Ruiz
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA) , Pamplona, Navarra, Spain
| | - Miriam Méndez
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA) , Pamplona, Navarra, Spain
| | - Estanislao Nistal-Villan
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA) , Pamplona, Navarra, Spain
| | - Esther Larrea
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA), Pamplona, Navarra, Spain; Instituto de Salud Tropical, University of Navarra, Pamplona, Navarra, Spain
| | - Qinshan Gao
- Department of Microbiology, Icahn School of Medicine at Mount Sinai , New York, NY, USA
| | - Gloria Gonzalez-Aseguinolaza
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA) , Pamplona, Navarra, Spain
| | - Jesus Prieto
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA) , Pamplona, Navarra, Spain
| | - Pedro Berraondo
- Program of Immunology and Immunotherapy, Center for Applied Medical Research (CIMA), Navarra Institute for Health Research (IdiSNA) , Pamplona, Navarra, Spain
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35
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Bocharov AV, Wu T, Baranova IN, Birukova AA, Sviridov D, Vishnyakova TG, Remaley AT, Eggerman TL, Patterson AP, Birukov KG. Synthetic Amphipathic Helical Peptides Targeting CD36 Attenuate Lipopolysaccharide-Induced Inflammation and Acute Lung Injury. THE JOURNAL OF IMMUNOLOGY 2016; 197:611-9. [PMID: 27316682 DOI: 10.4049/jimmunol.1401028] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Accepted: 04/28/2016] [Indexed: 01/07/2023]
Abstract
Synthetic amphipathic helical peptides (SAHPs) designed as apolipoprotein A-I mimetics are known to bind to class B scavenger receptors (SR-Bs), SR-BI, SR-BII, and CD36, receptors that mediate lipid transport and facilitate pathogen recognition. In this study, we evaluated SAHPs, selected for targeting human CD36, by their ability to attenuate LPS-induced inflammation, endothelial barrier dysfunction, and acute lung injury (ALI). L37pA, which targets CD36 and SR-BI equally, inhibited LPS-induced IL-8 secretion and barrier dysfunction in cultured endothelial cells while reducing lung neutrophil infiltration by 40% in a mouse model of LPS-induced ALI. A panel of 20 SAHPs was tested in HEK293 cell lines stably transfected with various SR-Bs to identify SAHPs with preferential selectivity toward CD36. Among several SAHPs targeting both SR-BI/BII and CD36 receptors, ELK-B acted predominantly through CD36. Compared with L37pA, 5A, and ELK SAHPs, ELK-B was most effective in reducing the pulmonary barrier dysfunction, neutrophil migration into the lung, and lung inflammation induced by LPS. We conclude that SAHPs with relative selectivity toward CD36 are more potent at inhibiting acute pulmonary inflammation and dysfunction. These data indicate that therapeutic strategies using SAHPs targeting CD36, but not necessarily mimicking all apolipoprotein A-I functions, may be considered a possible new treatment approach for inflammation-induced ALI and pulmonary edema.
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Affiliation(s)
- Alexander V Bocharov
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892; National Heart, Lung, and Blood Institute, Bethesda, MD 20892;
| | - Tinghuai Wu
- Lung Injury Center, The University of Chicago, Chicago, IL 60637
| | - Irina N Baranova
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892
| | - Anna A Birukova
- Lung Injury Center, The University of Chicago, Chicago, IL 60637
| | - Denis Sviridov
- National Institute of Diabetes, Digestive, and Kidney Diseases, Bethesda, MD 20892; and
| | - Tatyana G Vishnyakova
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892
| | - Alan T Remaley
- National Heart, Lung, and Blood Institute, Bethesda, MD 20892
| | - Thomas L Eggerman
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892; National Institute of Diabetes, Digestive, and Kidney Diseases, Bethesda, MD 20892; and
| | - Amy P Patterson
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892; Office of Science Policy, Office of the Director, National Institutes of Health, Bethesda, MD 20892
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36
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Baranova IN, Souza ACP, Bocharov AV, Vishnyakova TG, Hu X, Vaisman BL, Amar MJ, Chen Z, Kost Y, Remaley AT, Patterson AP, Yuen PST, Star RA, Eggerman TL. Human SR-BI and SR-BII Potentiate Lipopolysaccharide-Induced Inflammation and Acute Liver and Kidney Injury in Mice. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2016; 196:3135-47. [PMID: 26936883 PMCID: PMC4856165 DOI: 10.4049/jimmunol.1501709] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2015] [Accepted: 01/24/2016] [Indexed: 12/18/2022]
Abstract
The class B scavenger receptors BI (SR-BI) and BII (SR-BII) are high-density lipoprotein receptors that recognize various pathogens, including bacteria and their products. It has been reported that SR-BI/II null mice are more sensitive than normal mice to endotoxin-induced inflammation and sepsis. Because the SR-BI/II knockout model demonstrates multiple immune and metabolic disorders, we investigated the role of each receptor in the LPS-induced inflammatory response and tissue damage using transgenic mice with pLiv-11-directed expression of human SR-BI (hSR-BI) or human SR-BII (hSR-BII). At 6 h after i.p. LPS injection, transgenic hSR-BI and hSR-BII mice demonstrated markedly higher serum levels of proinflammatory cytokines and 2- to 3-fold increased expression levels of inflammatory mediators in the liver and kidney, compared with wild-type (WT) mice. LPS-stimulated inducible NO synthase expression was 3- to 6-fold higher in the liver and kidney of both transgenic strains, although serum NO levels were similar in all mice. Despite the lower high-density lipoprotein plasma levels, both transgenic strains responded to LPS by a 5-fold increase of plasma corticosterone levels, which were only moderately lower than in WT animals. LPS treatment resulted in MAPK activation in tissues of all mice; however, the strongest response was detected for hepatic extracellular signal-regulated protein kinase 1 and 2 and kidney JNK of both transgenic mice. Histological examination of hepatic and renal tissue from LPS-challenged mice revealed more injury in hSR-BII, but not hSR-BI, transgenic mice versus WT controls. Our findings demonstrate that hSR-BII, and to a lesser extent hSR-BI, significantly increase LPS-induced inflammation and contribute to LPS-induced tissue injury in the liver and kidney, two major organs susceptible to LPS toxicity.
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Affiliation(s)
- Irina N Baranova
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892
| | - Ana C P Souza
- Renal Diagnostics and Therapeutics Unit, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Alexander V Bocharov
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892;
| | - Tatyana G Vishnyakova
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892
| | - Xuzhen Hu
- Renal Diagnostics and Therapeutics Unit, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Boris L Vaisman
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892; and
| | - Marcelo J Amar
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892; and
| | - Zhigang Chen
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892
| | - Yana Kost
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892
| | - Alan T Remaley
- National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892; and
| | - Amy P Patterson
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892; National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892; and
| | - Peter S T Yuen
- Renal Diagnostics and Therapeutics Unit, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Robert A Star
- Renal Diagnostics and Therapeutics Unit, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Thomas L Eggerman
- Department of Laboratory Medicine, Clinical Center, National Institutes of Health, Bethesda, MD 20892; Division of Diabetes, Endocrinology, and Metabolic Diseases, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892
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Li J, Wang J, Li M, Yin L, Li XA, Zhang TG. Up-regulated expression of scavenger receptor class B type 1 (SR-B1) is associated with malignant behaviors and poor prognosis of breast cancer. Pathol Res Pract 2016; 212:555-9. [PMID: 27067809 DOI: 10.1016/j.prp.2016.03.011] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Revised: 02/22/2016] [Accepted: 03/30/2016] [Indexed: 12/22/2022]
Abstract
Scavenger receptor class B type 1 (SR-B1) is an integral membrane protein that is expressed in numerous cells and tissue types. The primary role of SR-B1 is to facilitate uptake of cholesteryl esters from high-density lipoproteins (HDL) in the liver. Altered SR-B1 expression contributes to human diseases. This study assessed association of SR-B1 expression in breast tissue specimens with breast cancer development and prognosis. Tissue specimens from 30 cases of adjacent normal breast tissues, ductal carcinoma in situ (DCIS) and invasive ductal breast cancer (IDCA) were subjected to Western blot analysis, and 135 cases of DCIS and IDCA were used for quantitative immunohistochemical analysis of SR-B1 expression. The data showed that SR-B1 was significantly overexpressed in IDCA tissues compared to normal breast and DCIS tissues. SR-B1 expression was associated with pre-menopausal status, tumor size, and worse overall survival of patients. The data from this ex vivo study suggests that up-regulated SR-B1 protein expression is associated with malignant behaviors of breast cancer and that SR-B1 is an independent predictor for poor survival in breast cancer patients.
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Affiliation(s)
- Juan Li
- Department of Pathology, Shandong University School of Medicine, Jinan, Shandong 250012, China; Department of Pathology, The Fourth Hospital of Jinan, Jinan, Shandong 250031, China
| | - Jing Wang
- Department of Pathology, The Fourth Hospital of Jinan, Jinan, Shandong 250031, China
| | - Ming Li
- Department of Chest Surgery, The Chest Hospital of Shandong, Jinan, Shandong 250000, China
| | - Linlin Yin
- Department of Oncology, The Fourth Hospital of Jinan, Jinan, Shandong 250031, China
| | - Xiang-An Li
- Department of Pediatrics, Saha Cardiovascular Research Center, University of Kentucky College of Medicine, Lexington, KY 40536, USA.
| | - Ting-Guo Zhang
- Department of Pathology, Shandong University School of Medicine, Jinan, Shandong 250012, China.
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Regulation of Adaptive Immunity in Health and Disease by Cholesterol Metabolism. Curr Allergy Asthma Rep 2015; 15:48. [PMID: 26149587 DOI: 10.1007/s11882-015-0548-7] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Four decades ago, it was observed that stimulation of T cells induces rapid changes in cellular cholesterol that are required before proliferation can commence. Investigators returning to this phenomenon have finally revealed its molecular underpinnings. Cholesterol trafficking and its dysregulation are now also recognized to strongly influence dendritic cell function, T cell polarization, and antibody responses. In this review, the state of the literature is reviewed on how cholesterol and its trafficking regulate the cells of the adaptive immune response and in vivo disease phenotypes of dysregulated adaptive immunity, including allergy, asthma, and autoimmune disease. Emerging evidence supporting a potential role for statins and other lipid-targeted therapies in the treatment of these diseases is presented. Just as vascular biologists have embraced immunity in the pathogenesis and treatment of atherosclerosis, so should basic and clinical immunologists in allergy, pulmonology, and other disciplines seek to encompass a basic understanding of lipid science.
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Black LL, Srivastava R, Schoeb TR, Moore RD, Barnes S, Kabarowski JH. Cholesterol-Independent Suppression of Lymphocyte Activation, Autoimmunity, and Glomerulonephritis by Apolipoprotein A-I in Normocholesterolemic Lupus-Prone Mice. THE JOURNAL OF IMMUNOLOGY 2015; 195:4685-98. [PMID: 26466956 DOI: 10.4049/jimmunol.1500806] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Accepted: 09/21/2015] [Indexed: 11/19/2022]
Abstract
Apolipoprotein (Apo)A-I, the major lipid-binding protein of high-density lipoprotein, can prevent autoimmunity and suppress inflammation in hypercholesterolemic mice by attenuating lymphocyte cholesterol accumulation and removing tissue-oxidized lipids. However, whether ApoA-I mediates immune-suppressive or anti-inflammatory effects under normocholesterolemic conditions and the mechanisms involved remain unresolved. We transferred bone marrow from systemic lupus erythematosus (SLE)-prone Sle123 mice into normal, ApoA-I-knockout (ApoA-I(-/-)) and ApoA-I-transgenic (ApoA-I(tg)) mice. Increased ApoA-I in ApoA-I(tg) mice suppressed CD4(+) T and B cell activation without changing lymphocyte cholesterol levels or reducing major ApoA-I-binding oxidized fatty acids. Unexpectedly, oxidized fatty acid peroxisome proliferator-activated receptor γ ligands 13- and 9-hydroxyoctadecadienoic acid were increased in lymphocytes of autoimmune ApoA-I(tg) mice. ApoA-I reduced Th1 cells independently of changes in CD4(+)Foxp3(+) regulatory T cells or CD11c(+) dendritic cell activation and migration. Follicular helper T cells, germinal center B cells, and autoantibodies were also lower in ApoA-I(tg) mice. Transgenic ApoA-I also improved SLE-mediated glomerulonephritis. However, ApoA-I deficiency did not have the opposite effects on autoimmunity or glomerulonephritis, possibly as the result of compensatory increases in ApoE on high-density lipoprotein. We conclude that, although compensatory mechanisms prevent the proinflammatory effects of ApoA-I deficiency in normocholesterolemic mice, increasing ApoA-I can attenuate lymphocyte activation and autoimmunity in SLE independently of cholesterol transport, possibly through oxidized fatty acid peroxisome proliferator-activated receptor γ ligands, and it can reduce renal inflammation in glomerulonephritis.
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Affiliation(s)
- Leland L Black
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Roshni Srivastava
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Trenton R Schoeb
- Department of Genetics, University of Alabama at Birmingham, Birmingham, AL 35294; and
| | - Ray D Moore
- Department of Pharmacology and Toxicology, Targeted Metabolomics and Proteomics Laboratory, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Stephen Barnes
- Department of Pharmacology and Toxicology, Targeted Metabolomics and Proteomics Laboratory, University of Alabama at Birmingham, Birmingham, AL 35294
| | - Janusz H Kabarowski
- Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL 35294;
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Sorci-Thomas MG, Pollard RD, Thomas MJ. What does procollagen C-endopeptidase enhancer protein 2 have to do with HDL-cholesteryl ester uptake? Or how I learned to stop worrying and love reverse cholesterol transport? Curr Opin Lipidol 2015; 26. [PMID: 26218419 PMCID: PMC4564020 DOI: 10.1097/mol.0000000000000211] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
PURPOSE OF REVIEW The purpose of this study is to provide an update on the role HDL apolipoprotein A-I plays in reducing the risk of cardiovascular disease (CVD) and how it relates to reverse cholesterol transport (RCT). RECENT FINDINGS Despite numerous studies showing that plasma HDL cholesterol concentrations are correlated with a reduced risk of CVD, pharmacologic elevation of HDL has not shown any beneficial effects to date. In contrast, studies correlating the measure of an individual's plasma cholesterol efflux capacity show greater promise as a tool for assessing CVD risk. Although ATP-binding cassette transporter 1-mediated lipidation of apoA-I is considered the principal source of plasma HDL, it represents only one side of the RCT pathway. Equally important is the second half of the RCT pathway in which the liver scavenger receptor class B1 selectively removes HDL cholesteryl esters for excretion. The combined action of the two enzyme systems is reflected in the overall steady-state concentration of plasma HDL cholesterol. For example, reduced ATP-binding cassette transporter 1-mediated production of nascent HDL lowers plasma HDL concentration, just as an increase in cholesteryl ester uptake by scavenger receptor class B1 reduces HDL levels. Thus, the complexity of intravascular HDL metabolism suggests that steady-state plasma HDL concentrations do not provide adequate information regarding an individual's HDL quality or function. Herein, we describe a new player, procollagen C-endopeptidase enhancer 2, which shows atheroprotective function and influences both sides of RCT by enhancing production and catabolism of HDL cholesteryl esters. SUMMARY The discovery of a new molecule, procollagen C-endopeptidase enhancer 2, implicated in the regulation of HDL cholesteryl ester concentrations suggests that the extracellular matrix and the proteins that regulate its function represent a new and as yet unexplored realm of HDL cholesterol metabolism.
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Affiliation(s)
- Mary G. Sorci-Thomas
- Department of Medicine and Endocrinology
- Department of Pharmacology & Toxicology, Medical College of Wisconsin, Milwaukee, Wisconsin
| | - Ricquita D. Pollard
- formerly of Wake Forest School of Medicine, Department of Molecular Medicine, Winston-Salem, North Carolina, USA
| | - Michael J. Thomas
- Department of Pharmacology & Toxicology, Medical College of Wisconsin, Milwaukee, Wisconsin
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Lockett AD, Petrusca DN, Justice MJ, Poirier C, Serban KA, Rush NI, Kamocka M, Predescu D, Predescu S, Petrache I. Scavenger receptor class B, type I-mediated uptake of A1AT by pulmonary endothelial cells. Am J Physiol Lung Cell Mol Physiol 2015; 309:L425-34. [PMID: 26092999 DOI: 10.1152/ajplung.00376.2014] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2014] [Accepted: 06/09/2015] [Indexed: 12/13/2022] Open
Abstract
In addition to exerting a potent anti-elastase function, α-1 antitrypsin (A1AT) maintains the structural integrity of the lung by inhibiting endothelial inflammation and apoptosis. A main serpin secreted in circulation by hepatocytes, A1AT requires uptake by the endothelium to achieve vasculoprotective effects. This active uptake mechanism, which is inhibited by cigarette smoking (CS), involves primarily clathrin- but also caveola-mediated endocytosis and may require active binding to a receptor. Because circulating A1AT binds to high-density lipoprotein (HDL), we hypothesized that scavenging receptors are candidates for endothelial uptake of the serpin. Although the low-density lipoprotein (LDL) receptor-related protein 1 (LRP1) internalizes only elastase-bound A1AT, the scavenger receptor B type I (SR-BI), which binds and internalizes HDL and is modulated by CS, may be involved in A1AT uptake. Transmission electron microscopy imaging of colloidal gold-labeled A1AT confirmed A1AT endocytosis in both clathrin-coated vesicles and caveolae in endothelial cells. SR-BI immunoprecipitation identified binding to A1AT at the plasma membrane. Pretreatment of human lung microvascular endothelial cells with SR-B ligands (HDL or LDL), knockdown of SCARB1 expression, or neutralizing SR-BI antibodies significantly reduced A1AT uptake by 30-50%. Scarb1 null mice exhibited decreased A1AT lung content following systemic A1AT administration and reduced lung anti-inflammatory effects of A1AT supplementation during short-term CS exposure. In turn, A1AT supplementation increased lung SR-BI expression and modulated circulating lipoprotein levels in wild-type animals. These studies indicate that SR-BI is an important mediator of A1AT endocytosis in pulmonary endothelium and suggest a cross talk between A1AT and lipoprotein regulation of vascular functions.
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Affiliation(s)
- Angelia D Lockett
- Division of Pulmonary, Allergy, Critical Care and Occupational Medicine, Department of Medicine, Indiana University, Indianapolis, Indiana;
| | - Daniela N Petrusca
- Division of Pulmonary, Allergy, Critical Care and Occupational Medicine, Department of Medicine, Indiana University, Indianapolis, Indiana
| | - Matthew J Justice
- Division of Pulmonary, Allergy, Critical Care and Occupational Medicine, Department of Medicine, Indiana University, Indianapolis, Indiana
| | - Christophe Poirier
- Division of Pulmonary, Allergy, Critical Care and Occupational Medicine, Department of Medicine, Indiana University, Indianapolis, Indiana
| | - Karina A Serban
- Division of Pulmonary, Allergy, Critical Care and Occupational Medicine, Department of Medicine, Indiana University, Indianapolis, Indiana
| | - Natalia I Rush
- Division of Pulmonary, Allergy, Critical Care and Occupational Medicine, Department of Medicine, Indiana University, Indianapolis, Indiana
| | - Malgorzata Kamocka
- Division of Nephrology, Department of Medicine, Indiana University, Indianapolis, Indiana
| | - Dan Predescu
- Department of Pharmacology, Rush University, Chicago, Illinois; and
| | - Sanda Predescu
- Department of Pharmacology, Rush University, Chicago, Illinois; and
| | - Irina Petrache
- Division of Pulmonary, Allergy, Critical Care and Occupational Medicine, Department of Medicine, Indiana University, Indianapolis, Indiana; The Richard L. Roudebush Veterans Affairs Medical Center, Indianapolis, Indiana
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Tao H, Yancey PG, Babaev VR, Blakemore JL, Zhang Y, Ding L, Fazio S, Linton MF. Macrophage SR-BI mediates efferocytosis via Src/PI3K/Rac1 signaling and reduces atherosclerotic lesion necrosis. J Lipid Res 2015; 56:1449-60. [PMID: 26059978 PMCID: PMC4513986 DOI: 10.1194/jlr.m056689] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2014] [Indexed: 12/13/2022] Open
Abstract
Macrophage apoptosis and efferocytosis are key determinants of atherosclerotic plaque inflammation and necrosis. Bone marrow transplantation studies in ApoE- and LDLR-deficient mice revealed that hematopoietic scavenger receptor class B type I (SR-BI) deficiency results in severely defective efferocytosis in mouse atherosclerotic lesions, resulting in a 17-fold higher ratio of free to macrophage-associated dead cells in lesions containing SR-BI−/− cells, 5-fold more necrosis, 65.2% less lesional collagen content, nearly 7-fold higher dead cell accumulation, and 2-fold larger lesion area. Hematopoietic SR-BI deletion elicited a maladaptive inflammatory response [higher interleukin (IL)-1β, IL-6, and TNF-α lower IL-10 and transforming growth factor β]. Efferocytosis of apoptotic thymocytes was reduced by 64% in SR-BI−/− versus WT macrophages, both in vitro and in vivo. In response to apoptotic cells, macrophage SR-BI bound with phosphatidylserine and induced Src phosphorylation and cell membrane recruitment, which led to downstream activation of phosphoinositide 3-kinase (PI3K) and Ras-related C3 botulinum toxin substrate 1 (Rac1) for engulfment and clearance of apoptotic cells, as inhibition of Src decreased PI3K, Rac1-GTP, and efferocytosis in WT cells. Pharmacological inhibition of Rac1 reduced macrophage efferocytosis in a SR-BI-dependent fashion, and activation of Rac1 corrected the defective efferocytosis in SR-BI−/− macrophages. Thus, deficiency of macrophage SR-BI promotes defective efferocytosis signaling via the Src/PI3K/Rac1 pathway, resulting in increased plaque size, necrosis, and inflammation.
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Affiliation(s)
- Huan Tao
- Department of Medicine, Atherosclerosis Research Unit, Division of Cardiovascular Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Patricia G Yancey
- Department of Medicine, Atherosclerosis Research Unit, Division of Cardiovascular Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Vladimir R Babaev
- Department of Medicine, Atherosclerosis Research Unit, Division of Cardiovascular Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - John L Blakemore
- Department of Medicine, Atherosclerosis Research Unit, Division of Cardiovascular Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Youmin Zhang
- Department of Medicine, Atherosclerosis Research Unit, Division of Cardiovascular Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Lei Ding
- Department of Medicine, Atherosclerosis Research Unit, Division of Cardiovascular Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232
| | - Sergio Fazio
- Department of Medicine, Physiology, and Pharmacology, Center of Preventive Cardiology, Oregon Health and Science University, Portland, OR 97239
| | - MacRae F Linton
- Department of Medicine, Atherosclerosis Research Unit, Division of Cardiovascular Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232 Department of Pharmacology, Vanderbilt University School of Medicine, Nashville, TN 37232
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HDL-bound sphingosine-1-phosphate restrains lymphopoiesis and neuroinflammation. Nature 2015; 523:342-6. [PMID: 26053123 PMCID: PMC4506268 DOI: 10.1038/nature14462] [Citation(s) in RCA: 170] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2014] [Accepted: 04/08/2015] [Indexed: 12/16/2022]
Abstract
Lipid mediators influence immunity in myriad ways. For example, circulating sphingosine 1-phosphate (S1P) is a key regulator of lymphocyte egress1,2. Although the majority of plasma S1P is bound to apolipoprotein M (ApoM) in the high-density lipoprotein (HDL) particle3, immunological functions of the ApoM-S1P complex are unknown. Here, we show that ApoM-S1P is dispensable for lymphocyte trafficking yet restrains lymphopoiesis by activating the S1P1 receptor on bone marrow (BM) lymphocyte progenitors. Mice that lacked ApoM (Apom−/−) had increased proliferation of Lin−Sca1+cKit+ hematopoietic progenitor cells (LSK) and common lymphoid progenitors (CLP) in BM. Pharmacologic activation or genetic overexpression of S1P1 suppressed LSK and CLP proliferation in vivo. ApoM was stably associated with BM CLPs, which showed active S1P1 signaling in vivo4. Moreover, ApoM+HDL, but not albumin-bound S1P, inhibited lymphopoiesis in vitro. Upon immune stimulation, Apom−/− mice developed more severe experimental autoimmune encephalomyelitis5, characterized by increased lymphocytes in the central nervous system (CNS) and breakdown of the blood-brain barrier. Thus, the ApoM-S1P-S1P1 signaling axis restrains the lymphocyte compartment and subsequently, adaptive immune responses. Unique biological functions imparted by specific S1P chaperones could be exploited for novel therapeutic opportunities.
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Miki Y, Koyama K, Kurusu H, Hirano K, Beppu M, Fujiwara Y. Nucleolin is a receptor for maleylated-bovine serum albumin on macrophages. Biol Pharm Bull 2015; 38:116-21. [PMID: 25744467 DOI: 10.1248/bpb.b14-00624] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Scavenger receptors have a broad range of functions that include pathogen clearance, and identification of the scavenger receptor family has been of great benefit to the field of physiology. The shuttling-protein nucleolin has recently been shown to possess scavenger receptor-like activity. We therefore investigated whether or not nucleolin is a receptor for maleylated-bovine serum albumin (maleylated-BSA), which is a common ligand for scavenger receptors. Binding and phagocytosis of native control-BSA by thioglycollate-elicited mouse peritoneal macrophages was weak, but that of maleylated-BSA was strong. Surface plasmon-resonance analysis revealed that nucleolin strongly associated with maleylated-BSA but not control-BSA or maleic anhydride. Further, co-treatment of macrophages with anti-nucleolin antibody, but not control-immunoglobulin G, inhibited binding of maleylated-BSA. In addition, antineoplastic guanine rich oligonucleotide (AGRO), a nucleolin-specific oligonucleotide aptamer, inhibited binding of maleylated-BSA. Further, binding of maleylated-BSA to nucleolin-transfected HEK293 cells was higher than that by control HEK cells. These results indicate that nucleolin is a receptor that enables macrophages to recognize maleylated-BSA.
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Affiliation(s)
- Yuichi Miki
- School of Pharmacy, Tokyo University of Pharmacy and Life Sciences
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Abstract
Numerous epidemiologic studies revealed that high-density lipoprotein (HDL) is an important risk factor for coronary heart disease. There are several well-documented HDL functions such as reversed cholesterol transport, inhibition of inflammation, or inhibition of platelet activation that may account for the atheroprotective effects of this lipoprotein. Mechanistically, these functions are carried out by a direct interaction of HDL particle or its components with receptors localized on the cell surface followed by generation of intracellular signals. Several HDL-associated receptor ligands such as apolipoprotein A-I (apoA-I) or sphingosine-1-phosphate (S1P) have been identified in addition to HDL holoparticles, which interact with surface receptors such as ATP-binding cassette transporter A1 (ABCA1); S1P receptor types 1, 2, and 3 (S1P1, S1P2, and S1P3); or scavenger receptor type I (SR-BI) and activate intracellular signaling cascades encompassing kinases, phospholipases, trimeric and small G-proteins, and cytoskeletal proteins such as actin or junctional protein such as connexin43. In addition, depletion of plasma cell cholesterol mediated by ABCA1, ATP-binding cassette transporter G1 (ABCG1), or SR-BI was demonstrated to indirectly inhibit signaling over proinflammatory or proliferation-stimulating receptors such as Toll-like or growth factor receptors. The present review summarizes the current knowledge regarding the HDL-induced signal transduction and its relevance to athero- and cardioprotective effects as well as other physiological effects exerted by HDL.
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Getz GS, Reardon CA. The mutual interplay of lipid metabolism and the cells of the immune system in relation to atherosclerosis. ACTA ACUST UNITED AC 2014; 9:657-671. [PMID: 25705263 DOI: 10.2217/clp.14.50] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Atherosclerosis is a chronic inflammation in the arterial wall involving cells of the innate and adaptive immune system that is promoted by hyperlipidemia. In addition, the immune system can influence lipids and lipoprotein levels and cellular lipid homeostasis can influence the level and function of the immune cells. We will review the effects of manipulation of adaptive immune cells and immune cell products on lipids and lipoproteins, focusing mainly on studies performed in murine models of atherosclerosis. We also review how lipoproteins and cellular lipid levels, particularly cholesterol levels, influence the function of cells of the innate and adaptive immune systems. The overriding theme is that these interactions are driven by the need to provide the energy and membrane components for cell proliferation and migration, membrane expansion and other functions that are so important in the functioning of the immune cells.
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Affiliation(s)
- Godfrey S Getz
- Department of Pathology, University of Chicago, Box MC 1089, 5841 S. Maryland Avenue, Chicago, IL 60637, USA
| | - Catherine A Reardon
- Department of Pathology, University of Chicago, Box MC 1089, 5841 S. Maryland Avenue, Chicago, IL 60637, USA
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Fuller M, Dadoo O, Serkis V, Abutouk D, MacDonald M, Dhingani N, Macri J, Igdoura SA, Trigatti BL. The Effects of Diet on Occlusive Coronary Artery Atherosclerosis and Myocardial Infarction in Scavenger Receptor Class B, Type 1/Low-Density Lipoprotein Receptor Double Knockout Mice. Arterioscler Thromb Vasc Biol 2014; 34:2394-403. [DOI: 10.1161/atvbaha.114.304200] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Mark Fuller
- From the Departments of Biochemistry and Biomedical Sciences (M.F., O.D., V.S., D.A., M.M., N.D., B.L.T.), Pathology and Molecular Medicine (J.M., S.A.I.), and Biology (S.A.I.), McMaster University, Hamilton, Ontario, Canada; and Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada (M.F., O.D., V.S., M.M., N.D., B.L.T.)
| | - Omid Dadoo
- From the Departments of Biochemistry and Biomedical Sciences (M.F., O.D., V.S., D.A., M.M., N.D., B.L.T.), Pathology and Molecular Medicine (J.M., S.A.I.), and Biology (S.A.I.), McMaster University, Hamilton, Ontario, Canada; and Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada (M.F., O.D., V.S., M.M., N.D., B.L.T.)
| | - Viktoria Serkis
- From the Departments of Biochemistry and Biomedical Sciences (M.F., O.D., V.S., D.A., M.M., N.D., B.L.T.), Pathology and Molecular Medicine (J.M., S.A.I.), and Biology (S.A.I.), McMaster University, Hamilton, Ontario, Canada; and Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada (M.F., O.D., V.S., M.M., N.D., B.L.T.)
| | - Dina Abutouk
- From the Departments of Biochemistry and Biomedical Sciences (M.F., O.D., V.S., D.A., M.M., N.D., B.L.T.), Pathology and Molecular Medicine (J.M., S.A.I.), and Biology (S.A.I.), McMaster University, Hamilton, Ontario, Canada; and Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada (M.F., O.D., V.S., M.M., N.D., B.L.T.)
| | - Melissa MacDonald
- From the Departments of Biochemistry and Biomedical Sciences (M.F., O.D., V.S., D.A., M.M., N.D., B.L.T.), Pathology and Molecular Medicine (J.M., S.A.I.), and Biology (S.A.I.), McMaster University, Hamilton, Ontario, Canada; and Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada (M.F., O.D., V.S., M.M., N.D., B.L.T.)
| | - Neel Dhingani
- From the Departments of Biochemistry and Biomedical Sciences (M.F., O.D., V.S., D.A., M.M., N.D., B.L.T.), Pathology and Molecular Medicine (J.M., S.A.I.), and Biology (S.A.I.), McMaster University, Hamilton, Ontario, Canada; and Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada (M.F., O.D., V.S., M.M., N.D., B.L.T.)
| | - Joseph Macri
- From the Departments of Biochemistry and Biomedical Sciences (M.F., O.D., V.S., D.A., M.M., N.D., B.L.T.), Pathology and Molecular Medicine (J.M., S.A.I.), and Biology (S.A.I.), McMaster University, Hamilton, Ontario, Canada; and Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada (M.F., O.D., V.S., M.M., N.D., B.L.T.)
| | - Suleiman A. Igdoura
- From the Departments of Biochemistry and Biomedical Sciences (M.F., O.D., V.S., D.A., M.M., N.D., B.L.T.), Pathology and Molecular Medicine (J.M., S.A.I.), and Biology (S.A.I.), McMaster University, Hamilton, Ontario, Canada; and Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada (M.F., O.D., V.S., M.M., N.D., B.L.T.)
| | - Bernardo L. Trigatti
- From the Departments of Biochemistry and Biomedical Sciences (M.F., O.D., V.S., D.A., M.M., N.D., B.L.T.), Pathology and Molecular Medicine (J.M., S.A.I.), and Biology (S.A.I.), McMaster University, Hamilton, Ontario, Canada; and Thrombosis and Atherosclerosis Research Institute, Hamilton Health Sciences and McMaster University, Hamilton, Ontario, Canada (M.F., O.D., V.S., M.M., N.D., B.L.T.)
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Martineau C, Martin-Falstrault L, Brissette L, Moreau R. Gender- and region-specific alterations in bone metabolism in Scarb1-null female mice. J Endocrinol 2014; 222:277-88. [PMID: 24928939 DOI: 10.1530/joe-14-0147] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A positive correlation between plasma levels of HDL and bone mass has been reported by epidemiological studies. As scavenger receptor class B, type I (SR-BI), the gene product of Scarb1, is known to regulate HDL metabolism, we recently characterized bone metabolism in Scarb1-null mice. These mice display high femoral bone mass associated with enhanced bone formation. As gender differences have been reported in HDL metabolism and SR-BI function, we investigated gender-specific bone alterations in Scarb1-null mice by microtomography and histology. We found 16% greater relative bone volume and 39% higher bone formation rate in the vertebrae from 2-month-old Scarb1-null females. No such alteration was seen in males, indicating gender- and region-specific differences in skeletal phenotype. Total and HDL-associated cholesterol levels, as well as ACTH plasma levels, were increased in both Scarb1-null genders, the latter being concurrent to impaired corticosterone response to fasting. Plasma levels of estradiol did not differ between null and WT females, suggesting that the estrogen metabolism alteration is not relevant to the higher vertebral bone mass in female Scarb1-null mice. Constitutively, high plasma levels of leptin along with 2.5-fold increase in its expression in white adipose tissue were measured in female Scarb1-null mice only. In vitro exposure of bone marrow stromal cells to ACTH and leptin promoted osteoblast differentiation as evidenced by increased gene expression of osterix and collagen type I alpha. Our results suggest that hyperleptinemia may account for the gender-specific high bone mass seen in the vertebrae of female Scarb1-null mice.
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Affiliation(s)
- Corine Martineau
- Laboratoire du Métabolisme OsseuxBioMed, Département des Sciences Biologiques Université du Québec à Montréal, Case Postale 8888, Succursale Centre-ville, Montréal, Quebec, Canada H3C 3P8Laboratoire du Métabolisme des LipoprotéinesBioMed, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Quebec, Canada H3C 3P8
| | - Louise Martin-Falstrault
- Laboratoire du Métabolisme OsseuxBioMed, Département des Sciences Biologiques Université du Québec à Montréal, Case Postale 8888, Succursale Centre-ville, Montréal, Quebec, Canada H3C 3P8Laboratoire du Métabolisme des LipoprotéinesBioMed, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Quebec, Canada H3C 3P8
| | - Louise Brissette
- Laboratoire du Métabolisme OsseuxBioMed, Département des Sciences Biologiques Université du Québec à Montréal, Case Postale 8888, Succursale Centre-ville, Montréal, Quebec, Canada H3C 3P8Laboratoire du Métabolisme des LipoprotéinesBioMed, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Quebec, Canada H3C 3P8
| | - Robert Moreau
- Laboratoire du Métabolisme OsseuxBioMed, Département des Sciences Biologiques Université du Québec à Montréal, Case Postale 8888, Succursale Centre-ville, Montréal, Quebec, Canada H3C 3P8Laboratoire du Métabolisme des LipoprotéinesBioMed, Département des Sciences Biologiques, Université du Québec à Montréal, Montréal, Quebec, Canada H3C 3P8
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Abstract
During infections or acute conditions high-density lipoproteins cholesterol (HDL-C) levels decrease very rapidly and HDL particles undergo profound changes in their composition and function. These changes are associated with poor prognosis following endotoxemia or sepsis and data from genetically modified animal models support a protective role for HDL. The same is true for some parasitic infections, where the key player appears to be a specific and minor component of HDL, namely apoL-1. The ability of HDL to influence cholesterol availability in lipid rafts in immune cells results in the modulation of toll-like receptors, MHC-II complex, as well as B- and T-cell receptors, while specific molecules shuttled by HDL such as sphingosine-1-phosphate (S1P) contribute to immune cells trafficking. Animal models with defects associated with HDL metabolism and/or influencing cell cholesterol efflux present features related to immune disorders. All these functions point to HDL as a platform integrating innate and adaptive immunity. The aim of this review is to provide an overview of the connection between HDL and immunity in atherosclerosis and beyond.
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Affiliation(s)
- Alberico Luigi Catapano
- Department of Pharmacological and Biomolecular Sciences, Università Degli Studi di Milano, via Balzaretti 9, Milan 20133, Italy IRCCS Multimedica, Milan, Italy
| | - Angela Pirillo
- IRCCS Multimedica, Milan, Italy Center for the Study of Atherosclerosis, Ospedale Bassini, Cinisello Balsamo, Italy
| | - Fabrizia Bonacina
- Department of Pharmacological and Biomolecular Sciences, Università Degli Studi di Milano, via Balzaretti 9, Milan 20133, Italy
| | - Giuseppe Danilo Norata
- Department of Pharmacological and Biomolecular Sciences, Università Degli Studi di Milano, via Balzaretti 9, Milan 20133, Italy Center for the Study of Atherosclerosis, Ospedale Bassini, Cinisello Balsamo, Italy The Blizard Institute, Centre for Diabetes, Barts and The London School of Medicine & Dentistry, Queen Mary University, London, UK
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50
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Guo L, Zheng Z, Ai J, Huang B, Li XA. Hepatic scavenger receptor BI protects against polymicrobial-induced sepsis through promoting LPS clearance in mice. J Biol Chem 2014; 289:14666-73. [PMID: 24719333 DOI: 10.1074/jbc.m113.537258] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Recent studies revealed that scavenger receptor BI (SR-BI or Scarb1) plays a critical protective role in sepsis. However, the mechanisms underlying this protection remain largely unknown. In this study, using Scarb1(I179N) mice, a mouse model specifically deficient in hepatic SR-BI, we report that hepatic SR-BI protects against cecal ligation and puncture (CLP)-induced sepsis as shown by 75% fatality in Scarb1(I179N) mice, but only 21% fatality in C57BL/6J control mice. The increase in fatality in Scarb1(I179N) mice was associated with an exacerbated inflammatory cytokine production. Further study demonstrated that hepatic SR-BI exerts its protection against sepsis through its role in promoting LPS clearance without affecting the inflammatory response in macrophages, the glucocorticoid production in adrenal glands, the leukocyte recruitment to peritoneum or the bacterial clearance in liver. Our findings reveal hepatic SR-BI as a critical protective factor in sepsis and point out that promoting hepatic SR-BI-mediated LPS clearance may provide a therapeutic approach for sepsis.
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Affiliation(s)
- Ling Guo
- From the Department of Pediatrics, Saha Cardiovascular Research Center
| | - Zhong Zheng
- From the Department of Pediatrics, Graduate Center for Nutritional Sciences, and
| | - Junting Ai
- From the Department of Pediatrics, Graduate Center for Nutritional Sciences, and
| | - Bin Huang
- Kentucky Cancer Registry, University of Kentucky College of Medicine, Lexington, Kentucky 40536
| | - Xiang-An Li
- From the Department of Pediatrics, Saha Cardiovascular Research Center, Kentucky Cancer Registry, University of Kentucky College of Medicine, Lexington, Kentucky 40536
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