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Júnior RFDA, Lira GA, Schomann T, Cavalcante RS, Vilar NF, de Paula RCM, Gomes RF, Chung CK, Jorquera-Cordero C, Vepris O, Chan AB, Cruz LJ. Retinoic acid-loaded PLGA nanocarriers targeting cell cholesterol potentialize the antitumour effect of PD-L1 antibody by preventing epithelial-mesenchymal transition mediated by M2-TAM in colorectal cancer. Transl Oncol 2023; 31:101647. [PMID: 36857852 PMCID: PMC9989692 DOI: 10.1016/j.tranon.2023.101647] [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: 08/06/2022] [Revised: 11/30/2022] [Accepted: 02/20/2023] [Indexed: 03/03/2023] Open
Abstract
Tumour-associated macrophages (TAMs) often promote cancer progression through immunosuppression in the tumour microenvironment (TME). However, the signalling pathways crosstalk responsible for this mechanism remain unclear. The aim of our study was to investigate whether the interaction between TAMs and colorectal cancer cells could be down-regulated by nanoparticles (NPs) loaded with retinoic acid (RA) and coated with cholesterol (CHO), in combination with an anti-PD-L1 immune checkpoint inhibitor. Tumours were evaluated by qRT-PCR and immunohistochemistry from allographic tumour growth model. In addition, human tumours were evaluated by Tissue Microarray (TMA) and immunohistochemistry. Complementary analysis of epithelial-mesenchymal transition, cell migration, and macrophage polarisation were evaluated in vitro. We showed that the IL-10R/IL-10 axis is involved in overstimulation of the STAT3 pathway as well as downregulation of the NF-κB signalling pathway, which supports a loop of immunosuppressive cytokines that induces the M2-TAM phenotype. Furthermore, our combined findings suggest that the upregulation of STAT3/NF-κB pathways crosstalk mediated by immunosuppressive cytokines, such as IL-10/PD-L1/TGF-β, via M2-TAMs in the TME, leads to immunosuppression and epithelial-mesenchymal-transition of the colorectal cancer for stimulating Vimentin, CXCL12 and CD163 in the primary tumours. Importantly, NPs holding RA and coated with CHO in combination with anti-PD-L1 were more efficient in blocking this signalling pathway. These results contribute to our understanding of the immunological mechanisms, especially the re-educating of TAMs, and provide a novel management strategy for aggressive colorectal cancers using anti-PD-L1-conjugated nanocarriers.
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Affiliation(s)
- Raimundo Fernandes de Araújo Júnior
- Cancer and Inflammation Research Laboratory, Department of Morphology, Federal University of Rio Grande do Norte Natal, RN 59072-970, Brazil; Post-Graduation Programme in Structural and Functional Biology, Federal University of Rio Grande do Norte, Natal, RN 59072-970, Brazil; Post-Graduation Programme in Health Science, Federal University of Rio Grande do Norte, Natal, RN 59072-970, Brazil; Percuros B.V., Leiden, CL 2333, the Netherlands; Translational Nanobiomaterials and Imaging, Department of Radiology, Leiden University Medical Center, Leiden, ZA 2333, the Netherlands.
| | - George A Lira
- Cancer and Inflammation Research Laboratory, Department of Morphology, Federal University of Rio Grande do Norte Natal, RN 59072-970, Brazil; Post-Graduation Programme in Health Science, Federal University of Rio Grande do Norte, Natal, RN 59072-970, Brazil; Translational Nanobiomaterials and Imaging, Department of Radiology, Leiden University Medical Center, Leiden, ZA 2333, the Netherlands; League Against Cancer from Rio Grande do Norte, Advanced Oncology Center, Natal 59075-740, Brazil
| | - Timo Schomann
- Percuros B.V., Leiden, CL 2333, the Netherlands; Translational Nanobiomaterials and Imaging, Department of Radiology, Leiden University Medical Center, Leiden, ZA 2333, the Netherlands
| | - Rômulo S Cavalcante
- Cancer and Inflammation Research Laboratory, Department of Morphology, Federal University of Rio Grande do Norte Natal, RN 59072-970, Brazil; Post-Graduation Programme in Health Science, Federal University of Rio Grande do Norte, Natal, RN 59072-970, Brazil
| | - Natalia Feitosa Vilar
- Cancer and Inflammation Research Laboratory, Department of Morphology, Federal University of Rio Grande do Norte Natal, RN 59072-970, Brazil
| | | | - Raelle Ferreira Gomes
- Post-Graduation Programme in Chemistry, Federal University of Ceará, Fortaleza, CE 60440-900, Brazil
| | - Chih Kit Chung
- Percuros B.V., Leiden, CL 2333, the Netherlands; Translational Nanobiomaterials and Imaging, Department of Radiology, Leiden University Medical Center, Leiden, ZA 2333, the Netherlands; JeNaCell GmbH, Winzerlaer Straße 2, Jena 07745, Germany
| | - Carla Jorquera-Cordero
- Percuros B.V., Leiden, CL 2333, the Netherlands; Department of Orthopedics, University Medical Center Utrecht, Heidelberglaan 100, Utrecht, CX 3584, the Netherlands
| | - Olena Vepris
- Translational Nanobiomaterials and Imaging, Department of Radiology, Leiden University Medical Center, Leiden, ZA 2333, the Netherlands
| | - Alan B Chan
- Percuros B.V., Leiden, CL 2333, the Netherlands
| | - Luis J Cruz
- Translational Nanobiomaterials and Imaging, Department of Radiology, Leiden University Medical Center, Leiden, ZA 2333, the Netherlands
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Wang Y, Wang D, Yang L, Zhang Y. Metabolic reprogramming in the immunosuppression of tumor-associated macrophages. Chin Med J (Engl) 2022; 135:2405-2416. [PMID: 36385099 PMCID: PMC9945195 DOI: 10.1097/cm9.0000000000002426] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Indexed: 11/18/2022] Open
Abstract
ABSTRACT Tumor-associated macrophages (TAMs) are an essential proportion of tumor-infiltrating immune cells in the tumor microenvironment (TME) and have immunosuppressive functions. The high plasticity and corresponding phenotypic transformation of TAMs facilitate oncogenesis and progression, and suppress antineoplastic responses. Due to the uncontrolled proliferation of tumor cells, metabolism homeostasis is regulated, leading to a series of alterations in the metabolite profiles in the TME, which have a commensurate influence on immune cells. Metabolic reprogramming of the TME has a profound impact on the polarization and function of TAMs, and can alter their metabolic profiles. TAMs undergo a series of metabolic reprogramming processes, involving glucose, lipid, and amino acid metabolism, and other metabolic pathways, which terminally promote the development of the immunosuppressive phenotype. TAMs express a pro-tumor phenotype by increasing glycolysis, fatty acid oxidation, cholesterol efflux, and arginine, tryptophan, glutamate, and glutamine metabolism. Previous studies on the metabolism of TAMs demonstrated that metabolic reprogramming has intimate crosstalk with anti-tumor or pro-tumor phenotypes and is crucial for the function of TAMs themselves. Targeting metabolism-related pathways is emerging as a promising therapeutic modality because of the massive metabolic remodeling that occurs in malignant cells and TAMs. Evidence reveals that the efficacy of immune checkpoint inhibitors is improved when combined with therapeutic strategies targeting metabolism-related pathways. In-depth research on metabolic reprogramming and potential therapeutic targets provides more options for anti-tumor treatment and creates new directions for the development of new immunotherapy methods. In this review, we elucidate the metabolic reprogramming of TAMs and explore how they sustain immunosuppressive phenotypes to provide a perspective for potential metabolic therapies.
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Affiliation(s)
- Ying Wang
- Biotherapy Center and Cancer Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
| | - Dan Wang
- Biotherapy Center and Cancer Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
| | - Li Yang
- Biotherapy Center and Cancer Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
- School of Life Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China
- Henan Key Laboratory for Tumor Immunology and Biotherapy, Zhengzhou, Henan 450052, China
- State Key Laboratory of Esophageal Cancer Prevention & Treatment, Zhengzhou University, Zhengzhou, Henan 450052, China
| | - Yi Zhang
- Biotherapy Center and Cancer Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, China
- School of Life Sciences, Zhengzhou University, Zhengzhou, Henan 450001, China
- Henan Key Laboratory for Tumor Immunology and Biotherapy, Zhengzhou, Henan 450052, China
- State Key Laboratory of Esophageal Cancer Prevention & Treatment, Zhengzhou University, Zhengzhou, Henan 450052, China
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Wculek SK, Dunphy G, Heras-Murillo I, Mastrangelo A, Sancho D. Metabolism of tissue macrophages in homeostasis and pathology. Cell Mol Immunol 2022; 19:384-408. [PMID: 34876704 PMCID: PMC8891297 DOI: 10.1038/s41423-021-00791-9] [Citation(s) in RCA: 129] [Impact Index Per Article: 64.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 09/25/2021] [Indexed: 02/06/2023] Open
Abstract
Cellular metabolism orchestrates the intricate use of tissue fuels for catabolism and anabolism to generate cellular energy and structural components. The emerging field of immunometabolism highlights the importance of cellular metabolism for the maintenance and activities of immune cells. Macrophages are embryo- or adult bone marrow-derived leukocytes that are key for healthy tissue homeostasis but can also contribute to pathologies such as metabolic syndrome, atherosclerosis, fibrosis or cancer. Macrophage metabolism has largely been studied in vitro. However, different organs contain diverse macrophage populations that specialize in distinct and often tissue-specific functions. This context specificity creates diverging metabolic challenges for tissue macrophage populations to fulfill their homeostatic roles in their particular microenvironment and conditions their response in pathological conditions. Here, we outline current knowledge on the metabolic requirements and adaptations of macrophages located in tissues during homeostasis and selected diseases.
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Affiliation(s)
- Stefanie K Wculek
- Immunobiology Laboratory, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Melchor Fernández Almagro 3, Madrid, 28029, Spain.
| | - Gillian Dunphy
- Immunobiology Laboratory, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Melchor Fernández Almagro 3, Madrid, 28029, Spain
| | - Ignacio Heras-Murillo
- Immunobiology Laboratory, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Melchor Fernández Almagro 3, Madrid, 28029, Spain
| | - Annalaura Mastrangelo
- Immunobiology Laboratory, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Melchor Fernández Almagro 3, Madrid, 28029, Spain
| | - David Sancho
- Immunobiology Laboratory, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Melchor Fernández Almagro 3, Madrid, 28029, Spain.
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Hoppstädter J, Dembek A, Höring M, Schymik HS, Dahlem C, Sultan A, Wirth N, Al-Fityan S, Diesel B, Gasparoni G, Walter J, Helms V, Huwer H, Simon M, Liebisch G, Schulz MH, Kiemer AK. Dysregulation of cholesterol homeostasis in human lung cancer tissue and tumour-associated macrophages. EBioMedicine 2021; 72:103578. [PMID: 34571364 PMCID: PMC8479395 DOI: 10.1016/j.ebiom.2021.103578] [Citation(s) in RCA: 44] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 08/18/2021] [Accepted: 09/01/2021] [Indexed: 12/20/2022] Open
Abstract
Background Based on reports on elevated cholesterol levels in cancer cells, strategies to lower cholesterol synthesis have been suggested as an antitumour strategy. However, cholesterol depletion has also been shown to induce tumour-promoting actions in tumour-associated macrophages (TAMs). Methods We performed lipidomic and transcriptomic analyses of human lung cancer material. To assess whether the TAM phenotype is shaped by secreted factors produced by tumour cells, primary human monocyte-derived macrophages were polarized towards a TAM-like phenotype using tumour cell-conditioned medium. Findings Lipidomic analysis of lung adenocarcinoma (n=29) and adjacent non-tumour tissues (n=22) revealed a significant accumulation of free cholesterol and cholesteryl esters within the tumour tissue. In contrast, cholesterol levels were reduced in TAMs isolated from lung adenocarcinoma tissues when compared with alveolar macrophages (AMs) obtained from adjacent non-tumour tissues. Bulk-RNA-Seq revealed that genes involved in cholesterol biosynthesis and metabolism were downregulated in TAMs, while cholesterol efflux transporters were upregulated. In vitro polarized TAM-like macrophages showed an attenuated lipogenic gene expression signature and exhibited lower cholesterol levels compared with non-polarized macrophages. A genome-wide comparison by bulk RNA-Seq confirmed a high similarity of ex vivo TAMs and in vitro TAM-like macrophages. Modulation of intracellular cholesterol levels by either starving, cholesterol depletion, or efflux transporter inhibition indicated that cholesterol distinctly shapes macrophage gene expression. Interpretation Our data show an opposite dysregulation of cholesterol homeostasis in tumour tissue vs. TAMs. Polarization of in vitro differentiated macrophages by tumour cell-conditioned medium recapitulates key features of ex vivo TAMs.
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Affiliation(s)
- Jessica Hoppstädter
- Department of Pharmacy, Pharmaceutical Biology, Saarland University, Saarbrücken, Germany
| | - Anna Dembek
- Department of Pharmacy, Pharmaceutical Biology, Saarland University, Saarbrücken, Germany
| | - Marcus Höring
- Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Regensburg, Regensburg, Germany
| | - Hanna S Schymik
- Department of Pharmacy, Pharmaceutical Biology, Saarland University, Saarbrücken, Germany
| | - Charlotte Dahlem
- Department of Pharmacy, Pharmaceutical Biology, Saarland University, Saarbrücken, Germany
| | - Afnan Sultan
- Center for Bioinformatics, Saarland University, Saarbrücken, Germany
| | - Natalie Wirth
- Center for Bioinformatics, Saarland University, Saarbrücken, Germany
| | - Salma Al-Fityan
- Department of Pharmacy, Pharmaceutical Biology, Saarland University, Saarbrücken, Germany
| | - Britta Diesel
- Department of Pharmacy, Pharmaceutical Biology, Saarland University, Saarbrücken, Germany
| | - Gilles Gasparoni
- Department of Genetics/Epigenetics, Saarland University, Saarbrücken, Germany
| | - Jörn Walter
- Department of Genetics/Epigenetics, Saarland University, Saarbrücken, Germany
| | - Volkhard Helms
- Center for Bioinformatics, Saarland University, Saarbrücken, Germany
| | - Hanno Huwer
- Department of Cardiothoracic Surgery, Völklingen Heart Center, Völklingen, Germany
| | - Martin Simon
- Molecular Cell Biology and Microbiology, University of Wuppertal, Faculty of Mathematics and Natural Sciences, Wuppertal, Germany
| | - Gerhard Liebisch
- Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Regensburg, Regensburg, Germany
| | - Marcel H Schulz
- Institute for Cardiovascular Regeneration, Goethe University, Frankfurt am Main, Germany
| | - Alexandra K Kiemer
- Department of Pharmacy, Pharmaceutical Biology, Saarland University, Saarbrücken, Germany.
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5
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Mao Z, Huang R, Xu J, Guo R, Wei X. Liver X Receptor α in Sciatic Nerve Exerts an Alleviating Effect on Neuropathic Pain Behaviors Induced by Crush Injury. Neurochem Res 2021; 46:358-366. [PMID: 33200264 DOI: 10.1007/s11064-020-03171-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 11/05/2020] [Accepted: 11/09/2020] [Indexed: 11/29/2022]
Abstract
Peripheral nerve injury often leads to neuropathic pain. In the present study, we assessed the role of liver x receptor alpha (LXRα), an oxysterol regulated nuclear transcription factor that promotes reverse cholesterol transport and alternative (M2) macrophage activation, in the development of neuropathic pain. We found that compared to WT mice, in LXRα knockout mice the development of mechanical allodynia following sciatic nerve crush was accelerated and the duration was prolonged. Furthermore, the expression of M1-like macrophage marker iNOS and M1-like macrophages inducer hydrogen peroxide (H2O2) was increased, whereas expression of M2 macrophage marker arginase-1 (Arg-1) and interleukin-10 (IL-10) was reduced in the sciatic nerve of LXRα knockout mice. Moreover, peri-sciatic administration of LXRs agonist GW3965, immediately after the nerve crush, into wild type mice, suppressed the mechanical allodynia induced by crush injury. GW3965 also suppressed the expression of iNOS and production of H2O2 in the injured nerve and enhanced the expression of IL-10 and Arg-1. Importantly, peri-sciatic administration of IL-10 neutralization antibody prevented the alleviating effect of GW3965 on mechanical allodynia. Altogether, these results indicates that the lack of LXRα in the sciatic nerve results in an augmented inflammatory profile of macrophages, which ultimately speed up the development of neuropathic pain and dampen its recovery following nerve injury. Activation of LXRα by its agonist might rebalance the neuroprotective and neurotoxic macrophage phenotypes, and thus alleviate the neuropathic pain behavior.
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Affiliation(s)
- Zuchao Mao
- Department of Physiology and Pain Research Center, Zhongshan School of Medicine, Sun Yat-Sen University, 74 Zhongshan Road 2, Guangzhou, 510080, Guangdong, People's Republic of China
| | - Ruizhen Huang
- Department of Physiology and Pain Research Center, Zhongshan School of Medicine, Sun Yat-Sen University, 74 Zhongshan Road 2, Guangzhou, 510080, Guangdong, People's Republic of China
| | - Jing Xu
- Department of Physiology and Pain Research Center, Zhongshan School of Medicine, Sun Yat-Sen University, 74 Zhongshan Road 2, Guangzhou, 510080, Guangdong, People's Republic of China
- Center for Laboratory Medicine, the First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Ruixian Guo
- Department of Physiology and Pain Research Center, Zhongshan School of Medicine, Sun Yat-Sen University, 74 Zhongshan Road 2, Guangzhou, 510080, Guangdong, People's Republic of China.
| | - Xuhong Wei
- Department of Physiology and Pain Research Center, Zhongshan School of Medicine, Sun Yat-Sen University, 74 Zhongshan Road 2, Guangzhou, 510080, Guangdong, People's Republic of China.
- Guangdong Provincial Key Laboratory of Brain Function and Disease, Guangzhou, Guangdong, People's Republic of China.
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6
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Wilkinson H, Leonard H, Chen D, Lawrence T, Robson M, Goossens P, McVey JH, Dorling A. PAR-1 signaling on macrophages is required for effective in vivo delayed-type hypersensitivity responses. iScience 2021; 24:101981. [PMID: 33458623 PMCID: PMC7797913 DOI: 10.1016/j.isci.2020.101981] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 11/13/2020] [Accepted: 12/17/2020] [Indexed: 12/15/2022] Open
Abstract
Delayed-type hypersensitivity (DTH) responses underpin chronic inflammation. Using a model of oxazolone-induced dermatitis and a combination of transgenic mice, adoptive cell transfer, and selective agonists/antagonists against protease activated receptors, we show that that PAR-1 signaling on macrophages by thrombin is required for effective granuloma formation. Using BM-derived macrophages (BMMs) in vitro, we show that thrombin signaling induced (a) downregulation of cell membrane reverse cholesterol transporter ABCA1 and (b) increased expression of IFNγ receptor and enhanced co-localization within increased areas of cholesterol-rich membrane microdomains. These two key phenotypic changes combined to make thrombin-primed BMMs sensitive to M1 polarization by 1000-fold less IFNγ, compared to resting BMMs. We confirm that changes in ABCA1 expression were directly responsible for the exquisite sensitivity to IFNγ in vitro and for the impact on granuloma formation in vivo. These data indicate that PAR-1 signaling plays a hitherto unrecognized and critical role in DTH responses.
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Affiliation(s)
- Hannah Wilkinson
- Department of Inflammation Biology, School of Immunology & Microbial Sciences, King's College London, Guy's Hospital, London SE1 9RT, UK
| | - Hugh Leonard
- Department of Inflammation Biology, School of Immunology & Microbial Sciences, King's College London, Guy's Hospital, London SE1 9RT, UK
| | - Daxin Chen
- Department of Inflammation Biology, School of Immunology & Microbial Sciences, King's College London, Guy's Hospital, London SE1 9RT, UK
| | - Toby Lawrence
- Centre for Inflammation Biology and Cancer Immunology, School of Immunology & Microbial Sciences, King's College London, London SE1 9RT, UK
| | - Michael Robson
- Department of Inflammation Biology, School of Immunology & Microbial Sciences, King's College London, Guy's Hospital, London SE1 9RT, UK
| | - Pieter Goossens
- Department of Pathology, Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, 6229HX Maastricht, the Netherlands
| | - John H McVey
- School of Bioscience & Medicine, Faculty of Health and Medical Sciences, University of Surrey, Guildford GU2 7XH, UK
| | - Anthony Dorling
- Department of Inflammation Biology, School of Immunology & Microbial Sciences, King's College London, Guy's Hospital, London SE1 9RT, UK
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Wu A, Wojtowicz K, Savary S, Hamon Y, Trombik T. Do ABC transporters regulate plasma membrane organization? Cell Mol Biol Lett 2020; 25:37. [PMID: 32647530 PMCID: PMC7336681 DOI: 10.1186/s11658-020-00224-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 05/05/2020] [Indexed: 12/29/2022] Open
Abstract
The plasma membrane (PM) spatiotemporal organization is one of the major factors controlling cell signaling and whole-cell homeostasis. The PM lipids, including cholesterol, determine the physicochemical properties of the membrane bilayer and thus play a crucial role in all membrane-dependent cellular processes. It is known that lipid content and distribution in the PM are not random, and their transversal and lateral organization is highly controlled. Mainly sphingolipid- and cholesterol-rich lipid nanodomains, historically referred to as rafts, are extremely dynamic “hot spots” of the PM controlling the function of many cell surface proteins and receptors. In the first part of this review, we will focus on the recent advances of PM investigation and the current PM concept. In the second part, we will discuss the importance of several classes of ABC transporters whose substrates are lipids for the PM organization and dynamics. Finally, we will briefly present the significance of lipid ABC transporters for immune responses.
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Affiliation(s)
- Ambroise Wu
- Faculty of Biotechnology, University of Wroclaw, Wroclaw, Poland
| | | | - Stephane Savary
- Lab. Bio-PeroxIL EA7270, University of Bourgogne Franche-Comté, Dijon, France
| | - Yannick Hamon
- Aix Marseille University, CNRS, INSERM, CIML, Centre d'Immunologie de Marseille-Luminy, Marseille, France
| | - Tomasz Trombik
- Faculty of Biotechnology, University of Wroclaw, Wroclaw, Poland
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8
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Abstract
The pro-tumoral diversion of macrophages remains an unresolved paradox of tumor immunology and a conceptual gap in the understanding of tumor biology. Goossens et al. (2019) identify a new level of cross-regulation by which tumors increase the membrane cholesterol efflux of macrophages to enhance their pro-tumoral activation in response to IL-4.
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Affiliation(s)
- Antonio Sica
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale "Amedeo Avogadro", via Bovio 6, Novara, Italy; Humanitas Clinical and Research Center, Via Manzoni 56, 20089 Rozzano, Milan, Italy.
| | - Augusto Bleve
- Department of Pharmaceutical Sciences, Università del Piemonte Orientale "Amedeo Avogadro", via Bovio 6, Novara, Italy; Center for Translational Research on Autoimmune and Allergic Diseases (CAAD), University of Piemonte Orientale, Novara, Italy
| | - Marina Chiara Garassino
- Thoracic Oncology Unit, Medical Oncology Department 1, Fondazione IRCCS Istituto Nazionale dei Tumori, Milan, Italy
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9
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Goossens P, Rodriguez-Vita J, Etzerodt A, Masse M, Rastoin O, Gouirand V, Ulas T, Papantonopoulou O, Van Eck M, Auphan-Anezin N, Bebien M, Verthuy C, Vu Manh TP, Turner M, Dalod M, Schultze JL, Lawrence T. Membrane Cholesterol Efflux Drives Tumor-Associated Macrophage Reprogramming and Tumor Progression. Cell Metab 2019; 29:1376-1389.e4. [PMID: 30930171 DOI: 10.1016/j.cmet.2019.02.016] [Citation(s) in RCA: 258] [Impact Index Per Article: 51.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 01/01/2019] [Accepted: 02/26/2019] [Indexed: 10/27/2022]
Abstract
Macrophages possess intrinsic tumoricidal activity, yet tumor-associated macrophages (TAMs) rapidly adopt an alternative phenotype within the tumor microenvironment that is marked by tumor-promoting immunosuppressive and trophic functions. The mechanisms that promote such TAM polarization remain poorly understood, but once identified, they may represent important therapeutic targets to block the tumor-promoting functions of TAMs and restore their anti-tumor potential. Here, we have characterized TAMs in a mouse model of metastatic ovarian cancer. We show that ovarian cancer cells promote membrane-cholesterol efflux and depletion of lipid rafts from macrophages. Increased cholesterol efflux promoted IL-4-mediated reprogramming, including inhibition of IFNγ-induced gene expression. Genetic deletion of ABC transporters, which mediate cholesterol efflux, reverts the tumor-promoting functions of TAMs and reduces tumor progression. These studies reveal an unexpected role for membrane-cholesterol efflux in driving TAM-mediated tumor progression while pointing to a potentially novel anti-tumor therapeutic strategy.
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Affiliation(s)
- Pieter Goossens
- CNRS, Aix Marseille University, INSERM, CIML, Marseille 13009, France; Department of Pathology, Cardiovascular Research Institute Maastricht, Maastricht University, 6229HX Maastricht, the Netherlands
| | - Juan Rodriguez-Vita
- CNRS, Aix Marseille University, INSERM, CIML, Marseille 13009, France; Vascular Signaling and Cancer (A270), German Cancer Research Center (DKFZ), Heidelberg 69120, Germany
| | - Anders Etzerodt
- CNRS, Aix Marseille University, INSERM, CIML, Marseille 13009, France; Department of Biomedicine, Aarhus University, Aarhus 8000, Denmark
| | - Marion Masse
- CNRS, Aix Marseille University, INSERM, CIML, Marseille 13009, France
| | - Olivia Rastoin
- CNRS, Aix Marseille University, INSERM, CIML, Marseille 13009, France
| | - Victoire Gouirand
- CNRS, Aix Marseille University, INSERM, CIML, Marseille 13009, France
| | - Thomas Ulas
- Genomics & Immunoregulation, Life and Medical Sciences Institute (LIMES), University of Bonn, Bonn 53115, Germany; PRECISE Platform for Single Cell Genomics and Epigenomics, German Center for Neurodegenerative Diseases and University of Bonn, Bonn 53127, Germany
| | - Olympia Papantonopoulou
- Genomics & Immunoregulation, Life and Medical Sciences Institute (LIMES), University of Bonn, Bonn 53115, Germany
| | - Miranda Van Eck
- Division of BioTherapeutics, Leiden Academic Centre for Drug Research, Universiteit Leiden, 2300 Leiden, the Netherlands
| | | | - Magali Bebien
- CNRS, Aix Marseille University, INSERM, CIML, Marseille 13009, France
| | | | | | - Martin Turner
- Laboratory of Lymphocyte Signaling and Development, The Babraham Institute, Cambridge CB22 3AT, UK
| | - Marc Dalod
- CNRS, Aix Marseille University, INSERM, CIML, Marseille 13009, France
| | - Joachim L Schultze
- Genomics & Immunoregulation, Life and Medical Sciences Institute (LIMES), University of Bonn, Bonn 53115, Germany; PRECISE Platform for Single Cell Genomics and Epigenomics, German Center for Neurodegenerative Diseases and University of Bonn, Bonn 53127, Germany
| | - Toby Lawrence
- CNRS, Aix Marseille University, INSERM, CIML, Marseille 13009, France; Centre for Inflammation Biology and Cancer Immunology, School of Immunology & Micriboal Sciences, King's College London, London SE1 1UL, UK; Henan Key Laboratory of Immunology and Targeted Therapy, School of Laboratory Medicine, Xinxiang Medical University, Xinxiang 453003, Henan Province, China.
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10
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Schulman IG. Liver X receptors link lipid metabolism and inflammation. FEBS Lett 2017; 591:2978-2991. [PMID: 28555747 DOI: 10.1002/1873-3468.12702] [Citation(s) in RCA: 136] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Accepted: 05/23/2017] [Indexed: 12/14/2022]
Abstract
The response of immune cells to pathogens is often associated with changes in the flux through basic metabolic pathways. Indeed, in many cases changes in metabolism appear to be necessary for a robust immune response. The Liver X receptors (LXRs) are members of the nuclear hormone receptor superfamily that regulate gene networks controlling cholesterol and lipid metabolism. In immune cells, particularly in macrophages, LXRs also inhibit proinflammatory gene expression. This Review will highlight recent studies that connect LXR-dependent control of lipid metabolism to regulation of the immune response.
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Affiliation(s)
- Ira G Schulman
- Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA, USA
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Yin K, You Y, Swier V, Tang L, Radwan MM, Pandya AN, Agrawal DK. Vitamin D Protects Against Atherosclerosis via Regulation of Cholesterol Efflux and Macrophage Polarization in Hypercholesterolemic Swine. Arterioscler Thromb Vasc Biol 2015; 35:2432-42. [PMID: 26381871 DOI: 10.1161/atvbaha.115.306132] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 09/03/2015] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Prevalence of vitamin D (VD) deficiency and its association with the risk of cardiovascular disease prompted us to evaluate the effect of VD status on lipid metabolism and atherosclerosis in hypercholesterolemic microswine. APPROACH AND RESULTS Yucatan microswine were fed with VD-deficient (0 IU/d), VD-sufficient (1000 IU/d), or VD-supplemented (3000 IU/d) high-cholesterol diet for 48 weeks. Serum lipids and 25(OH)-cholecalciferol levels were measured biweekly. Histology and biochemical parameters of liver and arteries were analyzed. Effect of 1,25(OH)2D3 on cholesterol metabolism was examined in human hepatocyte carcinoma cell line (HepG2) and human monocytic cell line (THP-1) macrophage-derived foam cells. VD deficiency decreased plasma high-density lipoprotein levels, expression of liver X receptors, ATP-binding membrane cassette transporter A1, and ATP-binding membrane cassette transporter G1 and promoted cholesterol accumulation and atherosclerosis in hypercholesterolemic microswine. VD promoted nascent high-density lipoprotein formation in HepG2 cells via ATP-binding membrane cassette transporter A1-mediated cholesterol efflux. Cytochrome P450 (CYP)27B1 and VD receptor were predominantly present in the CD206(+) M2 macrophage foam cell-accumulated cores in coronary artery plaques. 1,25(OH)2D3 increased the expression of liver X receptors, ATP-binding membrane cassette transporter A1, and ATP-binding membrane cassette transporter G1 and promoted cholesterol efflux in THP-1 macrophage-derived foam cells. 1,25(OH)2D3 decreased intracellular free cholesterol and polarized macrophages to M2 phenotype with decreased expression of tumor necrosis factor-α, interleukin-1β, interleukin-6 under lipopolysaccharide stimulation. 1,25(OH)2D3 markedly induced CYP27A1 expression via a VD receptor-dependent c-Jun N-terminal kinase (JNK) 1/2 signaling pathway and increased 27-hydroxycholesterol levels, which induced liver X receptors, ATP-binding membrane cassette transporter A1, and ATP-binding membrane cassette transporter G1 expression and stimulated cholesterol efflux that was inhibited by VD receptor antagonist and JNK1/2 signaling inhibitor in THP-1 macrophage-derived foam cell. CONCLUSIONS VD protects against atherosclerosis in hypercholesterolemic swine via controlling cholesterol efflux and macrophage polarization via increased CYP27A1 activation.
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Affiliation(s)
- Kai Yin
- From the Center for Clinical & Translational Science, Creighton University School of Medicine, Omaha, NE
| | - Yong You
- From the Center for Clinical & Translational Science, Creighton University School of Medicine, Omaha, NE
| | - Vicki Swier
- From the Center for Clinical & Translational Science, Creighton University School of Medicine, Omaha, NE
| | - Lin Tang
- From the Center for Clinical & Translational Science, Creighton University School of Medicine, Omaha, NE
| | - Mohamed M Radwan
- From the Center for Clinical & Translational Science, Creighton University School of Medicine, Omaha, NE
| | - Amit N Pandya
- From the Center for Clinical & Translational Science, Creighton University School of Medicine, Omaha, NE
| | - Devendra K Agrawal
- From the Center for Clinical & Translational Science, Creighton University School of Medicine, Omaha, NE.
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12
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Mitchell AJ, Roediger B, Weninger W. Monocyte homeostasis and the plasticity of inflammatory monocytes. Cell Immunol 2014; 291:22-31. [PMID: 24962351 DOI: 10.1016/j.cellimm.2014.05.010] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2014] [Accepted: 05/27/2014] [Indexed: 12/13/2022]
Abstract
Monocytes are mononuclear myeloid cells that develop in the bone marrow and circulate within the bloodstream. Although they have long been argued to play a role in the repopulation of tissue-resident macrophages, this has been questioned by numerous recent studies, which has forced a reappraisal of their biology. Here we discuss monocyte development, as well as the homeostatic control of monocyte subpopulations within the blood. We also outline the known functions of monocyte subsets. Finally, we highlight the plastic nature of monocytes, which are capable of a remarkable range of phenotypic and functional changes that depend on signals from local microenvironments.
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Affiliation(s)
| | - Ben Roediger
- The Centenary Institute, Newtown, NSW 2042, Australia.
| | - Wolfgang Weninger
- The Centenary Institute, Newtown, NSW 2042, Australia; Discipline of Dermatology, University of Sydney, NSW, Australia; Department of Dermatology, Royal Prince Alfred Hospital, Camperdown, NSW, Australia.
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13
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Higham A, Lea S, Plumb J, Maschera B, Simpson K, Ray D, Singh D. The role of the liver X receptor in chronic obstructive pulmonary disease. Respir Res 2013; 14:106. [PMID: 24118845 PMCID: PMC3852990 DOI: 10.1186/1465-9921-14-106] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Accepted: 09/25/2013] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND There is a need for novel anti-inflammatory therapies to treat COPD. The liver X receptor (LXR) is a nuclear hormone receptor with anti-inflammatory properties. METHODS We investigated LXR gene and protein expression levels in alveolar macrophages and whole lung tissue from COPD patients and controls, the effect of LXR activation on the suppression of inflammatory mediators from LPS stimulated COPD alveolar macrophages, and the effect of LXR activation on the induction of genes associated with alternative macrophage polarisation. RESULTS The levels of LXR mRNA were significantly increased in whole lung tissue extracts in COPD patients and smokers compared to non-smokers. The expression of LXR protein was significantly increased in small airway epithelium and alveolar epithelium in COPD patients compared to controls. No differences in LXR mRNA and protein levels were observed in alveolar macrophages between patient groups. The LXR agonist GW3965 significantly induced the expression of the LXR dependent genes ABCA1 and ABCG1 in alveolar macrophage cultures. In LPS stimulated alveolar macrophages, GW3965 suppressed the production of CXCL10 and CCL5, whilst stimulating IL-10 production. CONCLUSIONS GW3965 did not significantly suppress the production of TNFα, IL-1β, or CXCL8. Our major finding is that LXR activation has anti-inflammatory effects on CXC10, CCL5 and IL-10 production from alveolar macrophages.
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Affiliation(s)
- Andrew Higham
- The University of Manchester, NIHR Translational Research Facility, University Hospital of South Manchester Foundation Trust, Southmoor Road, Manchester M23 9LT, UK
| | - Simon Lea
- The University of Manchester, NIHR Translational Research Facility, University Hospital of South Manchester Foundation Trust, Southmoor Road, Manchester M23 9LT, UK
| | - Jonathan Plumb
- The University of Manchester, NIHR Translational Research Facility, University Hospital of South Manchester Foundation Trust, Southmoor Road, Manchester M23 9LT, UK
| | - Barbara Maschera
- GlaxoSmithKline, Respiratory CEDD, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
| | - Karen Simpson
- GlaxoSmithKline, Respiratory CEDD, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, UK
| | - David Ray
- The University of Manchester, NIHR Translational Research Facility, University Hospital of South Manchester Foundation Trust, Southmoor Road, Manchester M23 9LT, UK
| | - Dave Singh
- The University of Manchester, NIHR Translational Research Facility, University Hospital of South Manchester Foundation Trust, Southmoor Road, Manchester M23 9LT, UK
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14
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Leitinger N, Schulman IG. Phenotypic polarization of macrophages in atherosclerosis. Arterioscler Thromb Vasc Biol 2013; 33:1120-6. [PMID: 23640492 DOI: 10.1161/atvbaha.112.300173] [Citation(s) in RCA: 204] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Macrophages orchestrate the inflammatory response in inflamed tissues, and recent work indicates that these cells can alter their phenotypes and functions accordingly in response to changes in the microenvironment. Initial work in models of cardiovascular disease used immunologic markers to characterize macrophage phenotypes present in atherosclerotic plaque, and these studies have lately been extended through the use of markers that are more specific for atherosclerosis and metabolic disease. Together, these studies have led to a novel view of the function of macrophages in the development of atherosclerosis that suggests dynamic plasticity. Understanding this plasticity and the ensuing macrophage heterogeneity could lead to novel strategies of pharmacological intervention to combat chronic inflammation in metabolic diseases. Most importantly, revealing the functional characteristics of individual macrophage phenotypes will lead to a better understanding of their contribution to lesion development and plaque stability.
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Affiliation(s)
- Norbert Leitinger
- Department of Pharmacology, University of Virginia, Charlottesville, VA 22908-0735, USA.
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15
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Ma L, Dong F, Zaid M, Kumar A, Zha X. ABCA1 protein enhances Toll-like receptor 4 (TLR4)-stimulated interleukin-10 (IL-10) secretion through protein kinase A (PKA) activation. J Biol Chem 2012; 287:40502-12. [PMID: 23055522 DOI: 10.1074/jbc.m112.413245] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND ABCA1 is known to suppress proinflammatory cytokines. RESULTS ABCA1 activates PKA and up-regulates anti-inflammatory cytokine IL-10. Elevated PKA transforms macrophages to M2-like phenotype. Disrupting lipid rafts by statins MCD, and filipin recuperates ABCA1 phenotype and likely functions downstream of ABCA1. CONCLUSION By modulating cholesterol, ABCA1 activates PKA. This generates M2-like macrophages. SIGNIFICANCE ABCA1 does not simply suppress inflammatory response. It promotes M2-like activation and facilitates resolution. Nonresolving inflammatory response from macrophages is a major characteristic of atherosclerosis. Macrophage ABCA1 has been previously shown to suppress the secretion of proinflammatory cytokine. In the present study, we demonstrate that ABCA1 also promotes the secretion of IL-10, an anti-inflammatory cytokine critical for inflammation resolution. ABCA1(+/+) bone marrow-derived macrophages secrete more IL-10 but less proinflammatory cytokines than ABCA1(-/-) bone marrow-derived macrophages, similar to alternatively activated (M2) macrophages. We present evidence that ABCA1 activates PKA and that this elevated PKA activity contributes to M2-like inflammatory response from ABCA1(+/+) bone marrow-derived macrophages. Furthermore, cholesterol lowering by statins, methyl-β-cyclodextrin, or filipin also activates PKA and, consequently, transforms macrophages toward M2-like phenotype. Conversely, cholesterol enrichment suppresses PKA activity and promotes M1-like inflammatory response. As the primary function of ABCA1 is cholesterol removal, our results suggest that ABCA1 activates PKA by regulating cholesterol. Indeed, forced cholesterol enrichment in ABCA1-expressing macrophages suppresses PKA activation and elicits M1-like response. Collectively, these findings reveal a novel protective process by ABCA1-activated PKA in macrophages. They also suggest cholesterol lowering in extra-hepatic tissues by statins as an anti-inflammation strategy.
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Affiliation(s)
- Loretta Ma
- Ottawa Hospital Research Institute, University of Ottawa, Ottawa, Ontario, Canada
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16
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Finn AV, Nakano M, Polavarapu R, Karmali V, Saeed O, Zhao X, Yazdani S, Otsuka F, Davis T, Habib A, Narula J, Kolodgie FD, Virmani R. Hemoglobin directs macrophage differentiation and prevents foam cell formation in human atherosclerotic plaques. J Am Coll Cardiol 2011; 59:166-77. [PMID: 22154776 DOI: 10.1016/j.jacc.2011.10.852] [Citation(s) in RCA: 242] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Revised: 10/05/2011] [Accepted: 10/11/2011] [Indexed: 12/16/2022]
Abstract
OBJECTIVES The purpose of this study was to examine selective macrophage differentiation occurring in areas of intraplaque hemorrhage in human atherosclerosis. BACKGROUND Macrophage subsets are recognized in atherosclerosis, but the stimulus for and importance of differentiation programs remain unknown. METHODS We used freshly isolated human monocytes, a rabbit model, and human atherosclerotic plaques to analyze macrophage differentiation in response to hemorrhage. RESULTS Macrophages characterized by high expression of both mannose and CD163 receptors preferentially exist in atherosclerotic lesions at sites of intraplaque hemorrhage. These hemoglobin (Hb)-stimulated macrophages, M(Hb), are devoid of neutral lipids typical of foam cells. In vivo modeling of hemorrhage in the rabbit model demonstrated that sponges exposed to red cells showed an increase in mannose receptor-positive macrophages only when these cells contained Hb. Cultured human monocytes exposed to Hb:haptoglobin complexes, but not interleukin-4, expressed the M(Hb) phenotype and were characterized by their resistance to cholesterol loading and up-regulation of ATP-binding cassette (ABC) transporters. M(Hb) demonstrated increased ferroportin expression, reduced intracellular iron, and reactive oxygen species (ROS). Degradation of ferroportin using hepcidin increased ROS and inhibited ABCA1 expression and cholesterol efflux to apolipoprotein A-I, suggesting reduced ROS triggers these effects. Knockdown of liver X receptor alpha (LXRα) inhibited ABC transporter expression in M(Hb) and macrophages differentiated in the antioxidant superoxide dismutase. Last, LXRα luciferase reporter activity was increased in M(Hb) and significantly reduced by overnight treatment with hepcidin. Collectively, these data suggest that reduced ROS triggers LXRα activation and macrophage reverse cholesterol transport. CONCLUSIONS Hb is a stimulus for macrophage differentiation in human atherosclerotic plaques. A decrease in macrophage intracellular iron plays an important role in this nonfoam cell phenotype by reducing ROS, which drives transcription of ABC transporters through activation of LXRα. Reduction of macrophage intracellular iron may be a promising avenue to increase macrophage reverse cholesterol transport.
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Affiliation(s)
- Aloke V Finn
- Department of Internal Medicine, Emory University School of Medicine, Atlanta, Georgia, USA.
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17
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The mammalian ABC transporter ABCA1 induces lipid-dependent drug sensitivity in yeast. Biochim Biophys Acta Mol Cell Biol Lipids 2011; 1821:373-80. [PMID: 21787882 DOI: 10.1016/j.bbalip.2011.07.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2011] [Revised: 06/12/2011] [Accepted: 07/08/2011] [Indexed: 11/20/2022]
Abstract
ABCA1 belongs to the A class of ABC transporter, which is absent in yeast. ABCA1 elicits lipid translocation at the plasma membrane through yet elusive processes. We successfully expressed the mouse Abca1 gene in Saccharomyces cerevisiae. The cloned ABCA1 distributed at the yeast plasma membrane in stable discrete domains that we name MCA (membrane cluster containing ABCA1) and that do not overlap with the previously identified punctate structures MCC (membrane cluster containing Can1p) and MCP (membrane cluster containing Pma1p). By comparison with a nonfunctional mutant, we demonstrated that ABCA1 elicits specific phenotypes in response to compounds known to interact with membrane lipids, such as papuamide B, amphotericin B and pimaricin. The sensitivity of these novel phenotypes to the genetic modification of the membrane lipid composition was studied by the introduction of the cho1 and lcb1-100 mutations involved respectively in phosphatidylserine or sphingolipid biosynthesis in yeast cells. The results, corroborated by the analysis of equivalent mammalian mutant cell lines, demonstrate that membrane composition, in particular its phosphatidylserine content, influences the function of the transporter. We thus have reconstituted in yeast the essential functions associated to the expression of ABCA1 in mammals and characterized new physiological phenotypes prone to genetic analysis. This article is a part of a Special Issue entitled Advances in High Density Lipoprotein Formation and Metabolism: A Tribute to John F. Oram (1945-2010).
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18
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Zhao Y, Van Berkel TJ, Van Eck M. Relative roles of various efflux pathways in net cholesterol efflux from macrophage foam cells in atherosclerotic lesions. Curr Opin Lipidol 2010; 21:441-53. [PMID: 20683325 DOI: 10.1097/mol.0b013e32833dedaa] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE OF REVIEW Cholesterol efflux mechanisms are essential for macrophage cholesterol homeostasis. HDL, an important cholesterol efflux acceptor, comprises a class of heterogeneous particles that induce cholesterol efflux via distinct pathways. This review focuses on the understanding of the different cholesterol efflux pathways and physiological acceptors involved, and their regulation in atherosclerotic lesions. RECENT FINDINGS The synergistic interactions of ATP-binding cassette transporters A1 and G1 as well as ATP-binding cassette transporter A1 and scavenger receptor class B type I are essential for cellular cholesterol efflux and the prevention of macrophage foam cell formation. However, the importance of aqueous diffusion should also not be underestimated. Significant progress has been made in understanding the mechanisms underlying ATP-binding cassette A1-mediated cholesterol efflux and regulation of its expression and trafficking. Conditions locally in the atherosclerotic lesion, for example, lipids, cytokines, oxidative stress, and hypoxia, as well as systemic factors, including inflammation and diabetes, critically influence the expression of cholesterol transporters on macrophage foam cells. Furthermore, HDL modification and remodeling in atherosclerosis, inflammation, and diabetes impairs its function as an acceptor for cellular cholesterol. SUMMARY Recent advances in the understanding of the regulation of cholesterol transporters and their acceptors in atherosclerotic lesions indicate that HDL-based therapies should aim to enhance the activity of cholesterol transporters and improve both the quantity and quality of HDL.
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Affiliation(s)
- Ying Zhao
- Division of Biopharmaceutics, Leiden/Amsterdam Center for Drug Research, University of Leiden, Leiden, The Netherlands
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Mitchell AJ, Pradel LC, Chasson L, Van Rooijen N, Grau GE, Hunt NH, Chimini G. Technical advance: autofluorescence as a tool for myeloid cell analysis. J Leukoc Biol 2010; 88:597-603. [PMID: 20534703 DOI: 10.1189/jlb.0310184] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Cellular AF is usually considered a hindrance to flow cytometric analysis. Here, we incorporate AF into analysis of complex mixtures of leukocytes. Using a mouse model, we examined cellular AF at multiple excitation and emission wavelengths, and populations with discrete patterns were gated and examined for surface marker expression. In the spleen, all major myeloid populations were identified. In particular, the approach allowed simultaneous characterization of RPM and resident monocytes. When monocytes and RPM were compared, RPM exhibited a phenotype that was consistent with involvement in physiological processes, including expression of genes involved in lipid and iron metabolism. The presence of large amounts of stored ferric iron within RPM enabled purification of these cells using a magnetic-based approach. When adapted for use on leukocytes isolated from a range of other organs, incorporation of AF into analysis allowed identification and isolation of biologically important myeloid populations, including subsets that were not readily identifiable by conventional cytometric analysis.
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Affiliation(s)
- Andrew J Mitchell
- Centre d'Immunologie de Marseille-Luminy, INSERM-CNRS-Université de La Méditerranée, Marseille, France.
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20
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Thompson PA, Gauthier KC, Varley AW, Kitchens RL. ABCA1 promotes the efflux of bacterial LPS from macrophages and accelerates recovery from LPS-induced tolerance. J Lipid Res 2010; 51:2672-85. [PMID: 20472936 DOI: 10.1194/jlr.m007435] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Macrophages play important roles in both lipid metabolism and innate immunity. We show here that macrophage ATP-binding cassette transporter A1 (ABCA1), a transporter known for its ability to promote apolipoprotein-dependent cholesterol efflux, also participates in the removal of an immunostimulatory bacterial lipid, lipopolysaccharide (LPS). Whereas monocytes require an exogenous lipoprotein acceptor to remove cell-associated LPS, macrophages released LPS in the absence of an exogenous acceptor by a mechanism that was driven, in part, by endogenous apolipoprotein E (apoE). Agents that increased ABCA1 expression increased LPS efflux from wild-type but not ABCA1-deficient macrophages. Preexposure of peritoneal macrophages to LPS for 24 h increased the expression of ABCA1 and increased LPS efflux with a requirement for exogenous apolipoproteins due to suppression of endogenous apoE production. In contrast, LPS preconditioning of ABCA1-deficient macrophages significantly decreased LPS efflux and led to prolonged retention of cell-surface LPS. Although the initial response to LPS was similar in wild-type and ABCA1-deficient macrophages, LPS-induced tolerance was greater and more prolonged in macrophages that lacked ABCA1. Our results define a new role for macrophage ABCA1 in removing cell-associated LPS and restoring normal macrophage responsiveness.
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Affiliation(s)
- Patricia A Thompson
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX, USA
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Yin K, Liao DF, Tang CK. ATP-binding membrane cassette transporter A1 (ABCA1): a possible link between inflammation and reverse cholesterol transport. Mol Med 2010; 16:438-49. [PMID: 20485864 DOI: 10.2119/molmed.2010.00004] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2010] [Accepted: 05/11/2010] [Indexed: 12/12/2022] Open
Abstract
Atherosclerosis is characterized by a chronic inflammatory condition that involves numerous cellular and molecular inflammatory components. A wide array of inflammatory mediators, such as cytokines and proteins produced by macrophages and other cells, play a critical role in the development and progression of the disease. ATP-binding membrane cassette transporter A1 (ABCA1) is crucial for cellular cholesterol efflux and reverse cholesterol transport (RCT) and is also identified as an important target in antiatherosclerosis treatment. Evidence from several recent studies indicates that inflammation, along with other atherogenic-related mediators, plays distinct regulating roles in ABCA1 expression. Proatherogenic cytokines such as interferon (IFN)-γ and interleukin (IL)-1β have been shown to inhibit the expression of ABCA1, while antiatherogenic cytokines, including IL-10 and transforming growth factor (TGF)-β1, have been shown to promote the expression of ABCA1. Moreover, some cytokines such as tumor necrosis factor (TNF)-α seem to regulate ABCA1 expression in species-specific and dose-dependent manners. Inflammatory proteins such as C-reactive protein (CRP) and cyclooxygenase (COX)-2 are likely to inhibit ABCA1 expression during inflammation, and inflammation induced by lipopolysaccharide (LPS) was also found to block the expression of ABCA1. Interestingly, recent experiments revealed ABCA1 can function as an antiinflammatory receptor to suppress the expression of inflammatory factors, suggesting that ABCA1 may be the molecular basis for the interaction between inflammation and RCT. This review aims to summarize recent findings on the role of inflammatory cytokines, inflammatory proteins, inflammatory lipids, and the endotoxin-mediated inflammatory process in expression of ABCA1. Also covered is the current understanding of the function of ABCA1 in modulating the immune response and inflammation through its direct and indirect antiinflammatory mechanisms including lipid transport, high-density lipoprotein (HDL) formation and apoptosis.
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Affiliation(s)
- Kai Yin
- Institute of Cardiovascular Research, Key Laboratory for Atherosclerology of Hunan Province, Life Science Research Center, University of South China, Hengyang, China
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