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Romero-Ramírez L, Mey J. Emerging Roles of Bile Acids and TGR5 in the Central Nervous System: Molecular Functions and Therapeutic Implications. Int J Mol Sci 2024; 25:9279. [PMID: 39273226 PMCID: PMC11395147 DOI: 10.3390/ijms25179279] [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: 07/31/2024] [Revised: 08/15/2024] [Accepted: 08/17/2024] [Indexed: 09/15/2024] Open
Abstract
Bile acids (BAs) are cholesterol derivatives synthesized in the liver and released into the digestive tract to facilitate lipid uptake during the digestion process. Most of these BAs are reabsorbed and recycled back to the liver. Some of these BAs progress to other tissues through the bloodstream. The presence of BAs in the central nervous system (CNS) has been related to their capacity to cross the blood-brain barrier (BBB) from the systemic circulation. However, the expression of enzymes and receptors involved in their synthesis and signaling, respectively, support the hypothesis that there is an endogenous source of BAs with a specific function in the CNS. Over the last decades, BAs have been tested as treatments for many CNS pathologies, with beneficial effects. Although they were initially reported as neuroprotective substances, they are also known to reduce inflammatory processes. Most of these effects have been related to the activation of the Takeda G protein-coupled receptor 5 (TGR5). This review addresses the new challenges that face BA research for neuroscience, focusing on their molecular functions. We discuss their endogenous and exogenous sources in the CNS, their signaling through the TGR5 receptor, and their mechanisms of action as potential therapeutics for neuropathologies.
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Affiliation(s)
- Lorenzo Romero-Ramírez
- Laboratorio de Regeneración Neuronal, Hospital Nacional de Parapléjicos, Servicio de Salud de Castilla-La Mancha, 45071 Toledo, Spain
| | - Jörg Mey
- Laboratorio de Regeneración Neuronal, Hospital Nacional de Parapléjicos, Servicio de Salud de Castilla-La Mancha, 45071 Toledo, Spain
- EURON Graduate School of Neuroscience, Maastricht University, 6229 ER Maastricht, The Netherlands
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2
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Wang J, Hashimoto Y, Hiemori-Kondo M, Nakamoto A, Sakai T, Ye W, Abe-Kanoh N. Resveratrol and piceid enhance efferocytosis by increasing the secretion of MFG-E8 in human THP-1 macrophages. Biosci Biotechnol Biochem 2024; 88:1090-1101. [PMID: 38830798 DOI: 10.1093/bbb/zbae079] [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: 03/19/2024] [Accepted: 05/26/2024] [Indexed: 06/05/2024]
Abstract
The process of apoptotic cell clearance by phagocytes, known as efferocytosis, plays an essential role in maintaining homeostasis. Defects in efferocytosis can lead to inflammatory diseases such as atherosclerosis and autoimmune disorders. Therefore, the maintenance and promotion of efferocytosis are considered crucial for preventing these diseases. In this study, we observed that resveratrol, a representative functional food ingredient, and its glycoside, piceid, promoted efferocytosis in both human THP-1 macrophages differentiated with phorbol 12-myristate 13-acetate and peritoneal macrophages from thioglycolate-elicited mice. Resveratrol and piceid significantly increased mRNA expression and protein secretion of MFG-E8 in THP-1 macrophages. Furthermore, the activation of efferocytosis and the increment in MFG-E8 protein secretion caused by resveratrol or piceid treatment were canceled by MFG-E8 knockdown in THP-1 macrophages. In conclusion, we have demonstrated for the first time that resveratrol and piceid promote efferocytosis through the upregulation of MFG-E8 excretion in human THP-1 macrophages.
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Affiliation(s)
- Jing Wang
- Peking University Institute of Advanced Agricultural Sciences, Shandong Laboratory of Advanced Agricultural Sciences in Weifang, Weifang Key Laboratory of Grapevine Improvement and Utilization, Weifang, Shandong, China
| | - Yuki Hashimoto
- Department of Public Health and Applied Nutrition, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Miki Hiemori-Kondo
- Department of Nutrition, Faculty of Nutrition, University of Kochi, Kochi, Japan
| | - Akiko Nakamoto
- Department of Public Health and Applied Nutrition, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Tohru Sakai
- Department of Public Health and Applied Nutrition, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan
| | - Wenxiu Ye
- Peking University Institute of Advanced Agricultural Sciences, Shandong Laboratory of Advanced Agricultural Sciences in Weifang, Weifang Key Laboratory of Grapevine Improvement and Utilization, Weifang, Shandong, China
| | - Naomi Abe-Kanoh
- Department of Food, Life and Environmental Science, Faculty of Agriculture, Yamagata University, Tsuruoka, Yamagata, Japan
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Kim H, Kim B. Osteogenic Protection against Fine Dust with Erucic Acid-Induced Exosomes. J Funct Biomater 2024; 15:215. [PMID: 39194653 DOI: 10.3390/jfb15080215] [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: 06/25/2024] [Revised: 07/26/2024] [Accepted: 07/30/2024] [Indexed: 08/29/2024] Open
Abstract
Fine dust causes various disorders, including cardiovascular, neurological, renal, reproductive, motor, systemic, respiratory, and cancerous diseases. Therefore, it is essential to study functional materials to prevent these issues. This study investigated the beneficial effects of erucic acid against fine dust using methods such as miRNA profiling, quantitative PCR, flow cytometry, ELISA, and Alizarin O staining. Erucic acid effectively suppresses inflammation and upregulates osteogenic activators in fibroblasts exposed to fine dust. Additionally, erucic acid-induced exosomes (EIEs) strongly counteract the negative effects of fine dust on osteocytic differentiation and inflammation. Despite fine dust exposure, EIEs promoted osteocytic differentiation in adipose-derived stem cells (ASCs) and enhanced osteogenesis and phagocytosis in macrophages. The significant upregulation of RunX2 and BMP7 by EIEs indicates its strong role in osteocytic differentiation and protection against the effects of fine dust. EIEs also boosts immune activity and acts as an osteogenic trigger for macrophages. MicroRNA profiling revealed that EIEs dramatically upregulated miRNAs, including hsa-miRNA-1301-3p, hsa-miRNA-1908-5p, hsa-miRNA-423-5p, and hsa-miRNA-122-5p, which are associated with osteogenic differentiation and immunity. Therefore, EIEs show potential as biomaterials to prevent environment-borne diseases.
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Affiliation(s)
- Hyunjung Kim
- Department of Health and Safety Convergence Science, Korea University, Anam-ro 145, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Boyong Kim
- EVERBIO, 131, Jukhyeon-gil, Gwanghyewon-myeon, Jincheon-gun 27809, Republic of Korea
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Gibbings SL, Haist KC, Redente EF, Henson PM, Bratton DL. TNFα: TNFR1 signaling inhibits maturation and maintains the pro-inflammatory programming of monocyte-derived macrophages in murine chronic granulomatous disease. Front Immunol 2024; 15:1354836. [PMID: 38404573 PMCID: PMC10884288 DOI: 10.3389/fimmu.2024.1354836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Accepted: 01/24/2024] [Indexed: 02/27/2024] Open
Abstract
Introduction Loss of NADPH oxidase activity results in proinflammatory macrophages that contribute to hyperinflammation in Chronic Granulomatous Disease (CGD). Previously, it was shown in a zymosan-induced peritonitis model that gp91phox-/- (CGD) monocyte-derived macrophages (MoMacs) fail to phenotypically mature into pro-resolving MoMacs characteristic of wild type (WT) but retain the ability to do so when placed in the WT milieu. Accordingly, it was hypothesized that soluble factor(s) in the CGD milieu thwart appropriate programming. Methods We sought to identify key constituents using ex vivo culture of peritoneal inflammatory leukocytes and their conditioned media. MoMac phenotyping was performed via flow cytometry, measurement of efferocytic capacity and multiplex analysis of secreted cytokines. Addition of exogenous TNFα, TNFα neutralizing antibody and TNFR1-/- MoMacs were used to study the role of TNFα: TNFR1 signaling in MoMac maturation. Results More extensive phenotyping defined normal MoMac maturation and demonstrated failure of maturation of CGD MoMacs both ex vivo and in vivo. Protein components, and specifically TNFα, produced and released by CGD neutrophils and MoMacs into conditioned media was identified as critical to preventing maturation. Exogenous addition of TNFα inhibited WT MoMac maturation, and its neutralization allowed maturation of cultured CGD MoMacs. TNFα neutralization also reduced production of IL-1β, IL-6 and CXCL1 by CGD cells though these cytokines played no role in MoMac programming. MoMacs lacking TNFR1 matured more normally in the CGD milieu both ex vivo and following adoptive transfer in vivo. Discussion These data lend mechanistic insights into the utility of TNFα blockade in CGD and to other diseases where such therapy has been shown to be beneficial.
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Affiliation(s)
- Sophie L. Gibbings
- Department of Pediatrics, National Jewish Health, Denver, CO, United States
| | - Kelsey C. Haist
- Department of Pediatrics, National Jewish Health, Denver, CO, United States
| | - Elizabeth F. Redente
- Department of Pediatrics, National Jewish Health, Denver, CO, United States
- Department of Medicine, University of Colorado Denver, Aurora, CO, United States
| | - Peter M. Henson
- Department of Pediatrics, National Jewish Health, Denver, CO, United States
- Department of Medicine, University of Colorado Denver, Aurora, CO, United States
- Department of Immunology and Microbiology, University of Colorado Denver, Aurora, CO, United States
| | - Donna L. Bratton
- Department of Pediatrics, National Jewish Health, Denver, CO, United States
- Department of Pediatrics, University of Colorado Denver, Aurora, CO, United States
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5
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Fredman G, Khan S. Specialized pro-resolving mediators enhance the clearance of dead cells. Immunol Rev 2023; 319:151-157. [PMID: 37787174 DOI: 10.1111/imr.13278] [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] [Indexed: 10/04/2023]
Abstract
The failure to resolve inflammation underpins to several prevalent diseases, like atherosclerosis, and so identifying ways to boost resolution is unmet clinical needs. The resolution of inflammation is governed by several factors such as specialized pro-resolving mediators (SPMs) that counter-regulate pro-inflammatory pathways and promote tissue repair without compromising host defense. A major function of nearly all SPMs is to enhance the clearance of dead cells or efferocytosis. As such, phagocytes, such as macrophages, are essential cellular players in the resolution of inflammation because of their ability to rapidly and efficiently clear dead cells. This review highlights the role of SPMs in the clearance of apoptotic and necroptotic cells and offers insights into how targeting efferocytosis may provide new treatments for non-resolving diseases, like atherosclerosis.
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Affiliation(s)
- Gabrielle Fredman
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, New York, USA
| | - Sayeed Khan
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, New York, USA
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Hardesty JE, Warner JB, Song YL, Rouchka EC, McClain CJ, Warner DR, Kirpich IA. Resolvin D1 attenuated liver injury caused by chronic ethanol and acute LPS challenge in mice. FASEB J 2023; 37:e22705. [PMID: 36520060 PMCID: PMC9832974 DOI: 10.1096/fj.202200778r] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 11/28/2022] [Accepted: 12/01/2022] [Indexed: 12/23/2022]
Abstract
Alcohol-associated liver disease (ALD) is a major health problem with limited effective treatment options. Alcohol-associated hepatitis (AH) is a subset of severe ALD with a high rate of mortality due to infection, severe inflammation, and ultimately multi-organ failure. There is an urgent need for novel therapeutic approaches to alleviate the human suffering associated with this condition. Resolvin D1 (RvD1) promotes the resolution of inflammation and regulates immune responses. The current study aimed to test the therapeutic efficacy and mechanisms of RvD1-mediated effects on liver injury and inflammation in an experimental animal model that mimics severe AH in humans. Our data demonstrated that mice treated with RvD1 had attenuated liver injury and inflammation caused by EtOH and LPS exposure by limiting hepatic neutrophil accumulation and decreasing hepatic levels of pro-inflammatory cytokines. In addition, RvD1 treatment attenuated hepatic pyroptosis, an inflammatory form of cell death, via downregulation of pyroptosis-related genes such as GTPase family member b10 and guanylate binding protein 2, and reducing cleavage of caspase 11 and gasdermin-D. In vitro experiments with primary mouse hepatocytes and bone marrow-derived macrophages confirmed the effectiveness of RvD1 in the attenuation of pyroptosis. In summary, our data demonstrated that RvD1 treatment provided beneficial effects against liver injury and inflammation in an experimental animal model recapitulating features of severe AH in humans. Our results suggest that RvD1 may be a novel adjunct strategy to traditional therapeutic options for AH patients.
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Affiliation(s)
- Josiah E. Hardesty
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Louisville, Louisville, KY 40202, USA
| | - Jeffrey B. Warner
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Louisville, Louisville, KY 40202, USA
- Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY 40202, USA
| | - Ying L. Song
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Louisville, Louisville, KY 40202, USA
| | - Eric C. Rouchka
- Department of Computer Science and Engineering, Speed School of Engineering, University of Louisville, Louisville, KY 40292, USA
| | - Craig J. McClain
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Louisville, Louisville, KY 40202, USA
- Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY 40202, USA
- Robley Rex Veterans Medical Center, Louisville, KY 40206, USA
- University of Louisville Alcohol Center, University of Louisville School of Medicine, University of Louisville, Louisville, KY 40292, USA
- University of Louisville Hepatobiology & Toxicology Center, University of Louisville School of Medicine, University of Louisville, Louisville, KY 40292, USA
| | - Dennis R. Warner
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Louisville, Louisville, KY 40202, USA
| | - Irina A. Kirpich
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, University of Louisville, Louisville, KY 40202, USA
- Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY 40202, USA
- University of Louisville Alcohol Center, University of Louisville School of Medicine, University of Louisville, Louisville, KY 40292, USA
- University of Louisville Hepatobiology & Toxicology Center, University of Louisville School of Medicine, University of Louisville, Louisville, KY 40292, USA
- Department of Microbiology and Immunology, University of Louisville, Louisville, KY 40202, USA
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7
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Ji H, Zhang C, Xu F, Mao Q, Xia R, Chen M, Wang W, Lv S, Li W, Shi X. Inhaled Pro-Efferocytic Nanozymes Promote Resolution of Acute Lung Injury. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2022; 9:e2201696. [PMID: 35859230 PMCID: PMC9475552 DOI: 10.1002/advs.202201696] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Revised: 06/06/2022] [Indexed: 06/01/2023]
Abstract
Acute lung injury (ALI) is a significant contributor to the morbidity and mortality of sepsis. Characterized by uncontrolled inflammation and excessive inflammatory cells infiltration in lung, ALI has been exacerbated by impaired efferocytosis (clearance of apoptotic cells by macrophages). Through specific receptor recognition and activation of downstream signaling, efferocytic macrophages promote resolution of inflammation by efficiently engulfing dying cells, avoiding the consequent release of cellular inflammatory contents. Here, inspired by the intrinsic recovery mechanism of efferocytosis, an apoptotic cell membrane (ACM) coated antioxidant nanozyme (AOzyme) is engineered, thus obtaining an inhalable pro-efferocytic nanozyme (AOzyme@ACM). Notably, AOzyme@ACM can efficiently increase apoptotic cell removal by combing enhanced macrophages recognition of "eat me" signals through apoptotic body mimicking and scavenge of intracellular excessive reactive oxygen species (ROS), a significant barrier for efferocytosis. AOzyme@ACM can significantly inhibit inflammatory response, promote pro-resolving (M2) phenotype transition of macrophage, and alleviate ALI in endotoxemia mice compared with AOzyme group. By addressing the critical factor in the pathogenesis of sepsis-related ALI through restoring efferocytosis activity, the ACM-based antioxidant nanozyme in this study is envisioned to provide a promising strategy to treat this complex and challenging disease.
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Affiliation(s)
- Haiying Ji
- Department of Anesthesiology and Intensive Care UnitXinhua HospitalSchool of MedicineShanghai Jiaotong UniversityShanghai200092China
| | - Chengmi Zhang
- Department of Anesthesiology and Intensive Care UnitXinhua HospitalSchool of MedicineShanghai Jiaotong UniversityShanghai200092China
| | - Fengying Xu
- Department of AnesthesiologyNo. 971 Hospital of People's Liberation Army NavyQingdao266000China
| | - Qianyun Mao
- Department of EndocrinologyXinhua HospitalSchool of MedicineShanghai Jiaotong UniversityShanghai200092China
| | - Ran Xia
- Department of Anesthesiology and Intensive Care UnitXinhua HospitalSchool of MedicineShanghai Jiaotong UniversityShanghai200092China
| | - Muqiao Chen
- Department of Anesthesiology and Intensive Care UnitXinhua HospitalSchool of MedicineShanghai Jiaotong UniversityShanghai200092China
| | - Wei Wang
- Department of Anesthesiology and Intensive Care UnitXinhua HospitalSchool of MedicineShanghai Jiaotong UniversityShanghai200092China
| | - Shunan Lv
- Department of Anesthesiology and Intensive Care UnitXinhua HospitalSchool of MedicineShanghai Jiaotong UniversityShanghai200092China
| | - Weiwei Li
- Department of Anesthesiology and Intensive Care UnitXinhua HospitalSchool of MedicineShanghai Jiaotong UniversityShanghai200092China
| | - Xueyin Shi
- Department of Anesthesiology and Intensive Care UnitXinhua HospitalSchool of MedicineShanghai Jiaotong UniversityShanghai200092China
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8
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Efferocytosis in lung mucosae: implications for health and disease. Immunol Lett 2022; 248:109-118. [PMID: 35843361 DOI: 10.1016/j.imlet.2022.07.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Revised: 05/15/2022] [Accepted: 07/11/2022] [Indexed: 11/21/2022]
Abstract
Efferocytosis is imperative to maintain lung homeostasis and control inflammation. Populations of lung macrophages are the main efferocytes in this tissue, responsible for controlling immune responses and avoiding unrestrained inflammation and autoimmunity through the expression of a plethora of receptors that recognize multiple 'eat me' signals on apoptotic cells. Efferocytosis is essentially anti-inflammatory and tolerogenic. However, in some situations, apoptotic cells phagocytosis can elicit inflammatory and immunogenic immune responses. Here, we summarized the current knowledge of the mechanisms of efferocytosis, and how any abnormality in this process may have an important contribution to the lung pathophysiology of many chronic inflammatory lung diseases such as asthma, acute lung injury, chronic obstructive pulmonary disease, and cystic fibrosis. Further, we consider the consequences of the dual role of efferocytosis on the susceptibility or resistance to pulmonary microbial infections. Understanding how efferocytosis works in different contexts will be useful to the development of new and more effective strategies to control the diversity of lung diseases.
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Baicalin clears inflammation by enhancing macrophage efferocytosis via inhibition of RhoA/ROCK signaling pathway and regulating macrophage polarization. Int Immunopharmacol 2022; 105:108532. [DOI: 10.1016/j.intimp.2022.108532] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2021] [Revised: 12/28/2021] [Accepted: 01/06/2022] [Indexed: 12/29/2022]
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10
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Mao QY, He SY, Hu QY, Lu Y, Niu YX, Li XY, Zhang HM, Qin L, Su Q. Advanced Glycation End Products (AGEs) Inhibit Macrophage Efferocytosis of Apoptotic β Cells through Binding to the Receptor for AGEs. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2022; 208:1204-1213. [PMID: 35173034 DOI: 10.4049/jimmunol.2100695] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 12/17/2021] [Indexed: 06/14/2023]
Abstract
Pancreatic β cell apoptosis is important in the pathogenesis of type 2 diabetes mellitus (T2DM). Generally, apoptotic β cells are phagocytosed by macrophages in a process known as "efferocytosis." Efferocytosis is critical to the resolution of inflammation and is impaired in T2DM. Advanced glycation end products (AGEs), which are increased in T2DM, are known to suppress phagocytosis function in macrophages. In this study, we found that AGEs inhibited efferocytosis of apoptotic β cells by primary peritoneal macrophages in C57BL/6J mice or mouse macrophage cell line Raw264.7. Mechanistically, AGEs inhibit efferocytosis by blocking Ras-related C3 botulinum toxin substrate 1 activity and cytoskeletal rearrangement through receptor for advanced glycation end products/ras homolog family member A/Rho kinase signaling in macrophages. Furthermore, it was observed that AGEs decreased the secretion of anti-inflammatory factors and promoted the proinflammatory ones to modulate the inflammation function of efferocytosis. Taken together, our results indicate that AGEs inhibit efferocytosis through binding to receptor for advanced glycation end products and activating ras homolog family member A/Rho kinase signaling, thereby inhibiting the anti-inflammatory function of efferocytosis.
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Affiliation(s)
- Qian-Yun Mao
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China; and
| | - Sun-Yue He
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China; and
| | - Qiu-Yue Hu
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China; and
| | - Yao Lu
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China; and
| | - Yi-Xin Niu
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China; and
| | - Xiao-Yong Li
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China; and
| | - Hong-Mei Zhang
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China; and
| | - Li Qin
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China; and
- Department of Endocrinology, Xinhua Hospital Chongming Branch, School of Medicine, Shanghai Jiaotong University, Shanghai, China
| | - Qing Su
- Department of Endocrinology, Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China; and
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11
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Wu S, Romero-Ramírez L, Mey J. Taurolithocholic acid but not tauroursodeoxycholic acid rescues phagocytosis activity of bone marrow-derived macrophages under inflammatory stress. J Cell Physiol 2021; 237:1455-1470. [PMID: 34705285 PMCID: PMC9297999 DOI: 10.1002/jcp.30619] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Revised: 09/10/2021] [Accepted: 10/05/2021] [Indexed: 12/28/2022]
Abstract
Spinal cord injury (SCI) causes cell death and consequently the breakdown of axons and myelin. The accumulation of myelin debris at the lesion site induces inflammation and blocks axonal regeneration. Hematogenous macrophages contribute to the removal of myelin debris. In this study, we asked how the inflammatory state of macrophages affects their ability to phagocytose myelin. Bone marrow‐derived macrophages (BMDM) and Raw264.7 cells were stimulated with lipopolysaccharides (LPS) or interferon gamma (IFNγ), which induce inflammatory stress, and the endocytosis of myelin was examined. We found that activation of the TLR4‐NFκB pathway reduced myelin uptake by BMDM, while IFNγ‐Jak/STAT1 signaling did not. Since bile acids regulate lipid metabolism and in some cases reduce inflammation, our second objective was to investigate whether myelin clearance could be improved with taurolithocholic acid (TLCA), tauroursodeoxycholic acid or hyodeoxycholic acid. In BMDM only TLCA rescued myelin phagocytosis, when this activity was suppressed by LPS. Inhibition of protein kinase A blocked the effect of TLCA, while an agonist of the farnesoid X receptor did not rescue phagocytosis, implicating TGR5‐PKA signaling in the effect of TLCA. To shed light on the mechanism, we measured whether TLCA affected the expression of CD36, triggering receptor on myeloid cells‐2 (TREM2), and Gas6, which are known to be involved in phagocytosis and affected by inflammatory stimuli. Concomitant with an increase in expression of tumour necrosis factor alpha, LPS reduced expression of TREM2 and Gas6 in BMDM, and TLCA significantly diminished this downregulation. These findings suggest that activation of bile acid receptors may be used to improve myelin clearance in neuropathologies.
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Affiliation(s)
- Siyu Wu
- Unidad de Investigación, Laboratorio LRNI, Hospital Nacional de Parapléjicos, Toledo, Spain.,School of Mental Health and Neuroscience and EURON Graduate School of Neuroscience, Maastricht University, Maastricht, The Netherlands
| | - Lorenzo Romero-Ramírez
- Unidad de Investigación, Laboratorio LRNI, Hospital Nacional de Parapléjicos, Toledo, Spain
| | - Jörg Mey
- Unidad de Investigación, Laboratorio LRNI, Hospital Nacional de Parapléjicos, Toledo, Spain.,School of Mental Health and Neuroscience and EURON Graduate School of Neuroscience, Maastricht University, Maastricht, The Netherlands
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12
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Sadhu S, Decker C, Sansbury BE, Marinello M, Seyfried A, Howard J, Mori M, Hosseini Z, Arunachalam T, Finn AV, Lamar JM, Jourd'heuil D, Guo L, MacNamara KC, Spite M, Fredman G. Radiation-Induced Macrophage Senescence Impairs Resolution Programs and Drives Cardiovascular Inflammation. THE JOURNAL OF IMMUNOLOGY 2021; 207:1812-1823. [PMID: 34462312 DOI: 10.4049/jimmunol.2100284] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Accepted: 07/31/2021] [Indexed: 01/21/2023]
Abstract
Radiation is associated with tissue damage and increased risk of atherosclerosis, but there are currently no treatments and a very limited mechanistic understanding of how radiation impacts tissue repair mechanisms. We uncovered that radiation significantly delayed temporal resolution programs that were associated with decreased efferocytosis in vivo. Resolvin D1 (RvD1), a known proresolving ligand, promoted swift resolution and restored efferocytosis in sublethally irradiated mice. Irradiated macrophages exhibited several features of senescence, including increased expression of p16INK4A and p21, heightened levels of SA-β-gal, COX-2, several proinflammatory cytokines/chemokines, and oxidative stress (OS) in vitro, and when transferred to mice, they exacerbated inflammation in vivo. Mechanistically, heightened OS in senescent macrophages led to impairment in their ability to carry out efficient efferocytosis, and treatment with RvD1 reduced OS and improved efferocytosis. Sublethally irradiated Ldlr -/- mice exhibited increased plaque necrosis, p16INK4A cells, and decreased lesional collagen compared with nonirradiated controls, and treatment with RvD1 significantly reduced necrosis and increased lesional collagen. Removal of p16INK4A hematopoietic cells during advanced atherosclerosis with p16-3MR mice reduced plaque necrosis and increased production of key intraplaque-resolving mediators. Our results demonstrate that sublethal radiation drives macrophage senescence and efferocytosis defects and suggest that RvD1 may be a new therapeutic strategy to limit radiation-induced tissue damage.
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Affiliation(s)
- Sudeshna Sadhu
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY
| | - Christa Decker
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY
| | - Brian E Sansbury
- Department of Anesthesiology, Perioperative and Pain Medicine, Center for Experimental Therapeutics and Reperfusion Injury, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
| | - Michael Marinello
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY
| | - Allison Seyfried
- The Department of Immunology and Infectious Disease, Albany Medical College, Albany, NY; and
| | - Jennifer Howard
- The Department of Immunology and Infectious Disease, Albany Medical College, Albany, NY; and
| | | | - Zeinab Hosseini
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY
| | - Thilaka Arunachalam
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY
| | | | - John M Lamar
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY
| | - David Jourd'heuil
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY
| | | | - Katherine C MacNamara
- The Department of Immunology and Infectious Disease, Albany Medical College, Albany, NY; and
| | - Matthew Spite
- Department of Anesthesiology, Perioperative and Pain Medicine, Center for Experimental Therapeutics and Reperfusion Injury, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
| | - Gabrielle Fredman
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY;
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13
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Do DC, Zhang Y, Tu W, Hu X, Xiao X, Chen J, Hao H, Liu Z, Li J, Huang SK, Wan M, Gao P. Type II alveolar epithelial cell-specific loss of RhoA exacerbates allergic airway inflammation through SLC26A4. JCI Insight 2021; 6:e148147. [PMID: 34101619 PMCID: PMC8410088 DOI: 10.1172/jci.insight.148147] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 06/03/2021] [Indexed: 12/25/2022] Open
Abstract
The small GTPase RhoA and its downstream effectors are critical regulators in the pathophysiological processes of asthma. The underlying mechanism, however, remains undetermined. Here, we generated an asthma mouse model with RhoA–conditional KO mice (Sftpc-cre;RhoAfl/fl) in type II alveolar epithelial cells (AT2) and demonstrated that AT2 cell–specific deletion of RhoA leads to exacerbation of allergen-induced airway hyperresponsiveness and airway inflammation with elevated Th2 cytokines in bronchoalveolar lavage fluid (BALF). Notably, Sftpc-cre;RhoAfl/fl mice showed a significant reduction in Tgf-β1 levels in BALF and lung tissues, and administration of recombinant Tgf-β1 to the mice rescued Tgf-β1 and alleviated the increased allergic airway inflammation observed in Sftpc-cre;RhoAfl/fl mice. Using RNA sequencing technology, we identified Slc26a4 (pendrin), a transmembrane anion exchange, as the most upregulated gene in RhoA-deficient AT2 cells. The upregulation of SLC26A4 was further confirmed in AT2 cells of asthmatic patients and mouse models and in human airway epithelial cells expressing dominant-negative RHOA (RHOA-N19). SLA26A4 was also elevated in serum from asthmatic patients and negatively associated with the percentage of forced expiratory volume in 1 second (FEV1%). Furthermore, SLC26A4 inhibition promoted epithelial TGF-β1 release and attenuated allergic airway inflammation. Our study reveals a RhoA/SLC26A4 axis in AT2 cells that functions as a protective mechanism against allergic airway inflammation.
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Affiliation(s)
- Danh C Do
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Yan Zhang
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.,Department of Respiratory Medicine, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Wei Tu
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.,Department of Respirology & Allergy, Third Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - Xinyue Hu
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.,Department of Respiratory Medicine, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Xiaojun Xiao
- Institute of Allergy and Immunology, School of Medicine, Shenzhen University, Shenzhen, China
| | - Jingsi Chen
- Children's Hospital, Chongqing Medical University, Chongqing, China
| | - Haiping Hao
- JHMI Deep Sequencing and Microarray Core Facility, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Zhigang Liu
- Department of Respirology & Allergy, Third Affiliated Hospital of Shenzhen University, Shenzhen, China.,Institute of Allergy and Immunology, School of Medicine, Shenzhen University, Shenzhen, China
| | - Jing Li
- Department of Allergy and Clinical Immunology, Guangzhou Institute of Respiratory Health, State Key Laboratory of Respiratory Disease, The First Affiliated Hospital of Guangzhou Medical University, Guangzhou, China
| | - Shau-Ku Huang
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.,National Institute of Environmental Health Sciences, National Health Research Institutes, Miaoli, Taiwan
| | - Mei Wan
- Department of Orthopaedic Surgery, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Peisong Gao
- Division of Allergy and Clinical Immunology, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
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14
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Van Broeckhoven J, Sommer D, Dooley D, Hendrix S, Franssen AJPM. Macrophage phagocytosis after spinal cord injury: when friends become foes. Brain 2021; 144:2933-2945. [PMID: 34244729 DOI: 10.1093/brain/awab250] [Citation(s) in RCA: 57] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 06/12/2021] [Accepted: 06/20/2021] [Indexed: 11/14/2022] Open
Abstract
After spinal cord injury (SCI), macrophages can exert either beneficial or detrimental effects depending on their phenotype. Aside from their critical role in inflammatory responses, macrophages are also specialized in the recognition, engulfment, and degradation of pathogens, apoptotic cells, and tissue debris. They promote remyelination and axonal regeneration by removing inhibitory myelin components and cellular debris. However, excessive intracellular presence of lipids and dysregulated intracellular lipid homeostasis result in the formation of foamy macrophages. These develop a pro-inflammatory phenotype that may contribute to further neurological decline. Additionally, myelin-activated macrophages play a crucial role in axonal dieback and retraction. Here, we review the opposing functional consequences of phagocytosis by macrophages in SCI, including remyelination and regeneration versus demyelination, degeneration, and axonal dieback. Furthermore, we discuss how targeting the phagocytic ability of macrophages may have therapeutic potential for the treatment of SCI.
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Affiliation(s)
- Jana Van Broeckhoven
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Daniela Sommer
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
| | - Dearbhaile Dooley
- School of Medicine, Health Sciences Centre, University College Dublin, Belfield Dublin 4, Ireland.,UCD Conway Institute of Biomolecular & Biomedical Research, University College Dublin, Belfield, Dublin 4, Ireland
| | - Sven Hendrix
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium.,Medical School Hamburg, Hamburg, Germany
| | - Aimée J P M Franssen
- Department of Immunology and Infection, Biomedical Research Institute, Hasselt University, Diepenbeek, Belgium
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15
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Decker C, Sadhu S, Fredman G. Pro-Resolving Ligands Orchestrate Phagocytosis. Front Immunol 2021; 12:660865. [PMID: 34177900 PMCID: PMC8222715 DOI: 10.3389/fimmu.2021.660865] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 04/06/2021] [Indexed: 12/18/2022] Open
Abstract
The resolution of inflammation is a tissue protective program that is governed by several factors including specialized pro-resolving mediators (SPMs), proteins, gasses and nucleotides. Pro-resolving mediators activate counterregulatory programs to quell inflammation and promote tissue repair in a manner that does not compromise host defense. Phagocytes like neutrophils and macrophages play key roles in the resolution of inflammation because of their ability to remove debris, microbes and dead cells through processes including phagocytosis and efferocytosis. Emerging evidence suggests that failed resolution of inflammation and defective phagocytosis or efferocytosis underpins several prevalent human diseases. Therefore, understanding factors and mechanisms associated with enhancing these processes is a critical need. SPMs enhance phagocytosis and efferocytosis and this review will highlight mechanisms associated with their actions.
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Affiliation(s)
- Christa Decker
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, United States
| | - Sudeshna Sadhu
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, United States
| | - Gabrielle Fredman
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, United States
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16
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Lee J, Lu Y, Oshins R, West J, Moneypenny CG, Han K, Brantly ML. Alpha 1 Antitrypsin-Deficient Macrophages Have Impaired Efferocytosis of Apoptotic Neutrophils. Front Immunol 2020; 11:574410. [PMID: 33329539 PMCID: PMC7714766 DOI: 10.3389/fimmu.2020.574410] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 10/27/2020] [Indexed: 12/05/2022] Open
Abstract
Alpha 1 antitrypsin deficiency (AATD) is an autosomal co-dominant disorder characterized by a low level of circulating AAT, which significantly reduces protection for the lower airways against proteolytic burden caused by neutrophils. Neutrophils, which are terminally differentiated innate immune cells and play a critical role to clear pathogens, accumulate excessively in the lung of AATD individuals. The neutrophil burden in AATD individuals increases the risk for early-onset destructive lung diseases by producing neutrophil products such as reactive oxygen radicals and various proteases. The level of AAT in AATD individuals is not sufficient to inhibit the activity of neutrophil chemotactic factors such as CXCL-8 and LTB4, which could lead to alveolar neutrophil accumulation in AATD individuals. However, as neutrophils have a short lifespan, and apoptotic neutrophils are rapidly cleared by alveolar macrophages that outnumber the apoptotic neutrophils in the pulmonary alveolus, the increased chemotaxis activity does not fully explain the persistent neutrophil accumulation and the resulting chronic inflammation in AATD individuals. Here, we propose that the ability of alveolar macrophages to clear apoptotic neutrophils is impaired in AATD individuals and it could be the main driver to cause neutrophil accumulation in their lung. This study demonstrates that Z-AAT variant significantly increases the expression of pro-inflammatory cytokines including CXCL-8, CXCL1, LTB4, and TNFα in LPS-treated macrophages. These cytokines play a central role in neutrophil recruitment to the lung and in clearance of apoptotic neutrophils by macrophages. Our result shows that LPS treatment significantly reduces the efferocytosis ability of macrophages with the Z-AAT allele by inducing TNFα expression. We incubated monocyte-derived macrophages (MDMs) with apoptotic neutrophils and found that after 3 h of co-incubation, the expression level of CXCL-8 is reduced in M-MDMs but increased in Z-MDMs. This result shows that the expression of inflammatory cytokines could be increased by impaired efferocytosis. It indicates that the efferocytosis ability of macrophages plays an important role in regulating cytokine expression and resolving inflammation. Findings from this study would help us better understand the multifaceted effect of AAT on regulating neutrophil balance in the lung and the underlying mechanisms.
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Affiliation(s)
- Jungnam Lee
- Division of Pulmonary, Critical Care and Sleep Medicine, University of Florida, Gainesville, FL, United States
| | - Yuanqing Lu
- Division of Pulmonary, Critical Care and Sleep Medicine, University of Florida, Gainesville, FL, United States
| | - Regina Oshins
- Division of Pulmonary, Critical Care and Sleep Medicine, University of Florida, Gainesville, FL, United States
| | - Jesse West
- Division of Pulmonary, Critical Care and Sleep Medicine, University of Florida, Gainesville, FL, United States
| | - Craig G Moneypenny
- Division of Pulmonary, Critical Care and Sleep Medicine, University of Florida, Gainesville, FL, United States
| | - Kyudong Han
- Department of Microbiology, College of Science and Technology, Dankook University, Cheonan, South Korea.,DKU-Theragen Institute for NGS Analysis, Cheonan, South Korea
| | - Mark L Brantly
- Division of Pulmonary, Critical Care and Sleep Medicine, University of Florida, Gainesville, FL, United States
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17
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Morris G, Bortolasci CC, Puri BK, Olive L, Marx W, O'Neil A, Athan E, Carvalho AF, Maes M, Walder K, Berk M. The pathophysiology of SARS-CoV-2: A suggested model and therapeutic approach. Life Sci 2020; 258:118166. [PMID: 32739471 PMCID: PMC7392886 DOI: 10.1016/j.lfs.2020.118166] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/23/2020] [Accepted: 07/25/2020] [Indexed: 01/10/2023]
Abstract
In this paper, a model is proposed of the pathophysiological processes of COVID-19 starting from the infection of human type II alveolar epithelial cells (pneumocytes) by SARS-CoV-2 and culminating in the development of ARDS. The innate immune response to infection of type II alveolar epithelial cells leads both to their death by apoptosis and pyroptosis and to alveolar macrophage activation. Activated macrophages secrete proinflammatory cytokines and chemokines and tend to polarise into the inflammatory M1 phenotype. These changes are associated with activation of vascular endothelial cells and thence the recruitment of highly toxic neutrophils and inflammatory activated platelets into the alveolar space. Activated vascular endothelial cells become a source of proinflammatory cytokines and reactive oxygen species (ROS) and contribute to the development of coagulopathy, systemic sepsis, a cytokine storm and ARDS. Pulmonary activated platelets are also an important source of proinflammatory cytokines and ROS, as well as exacerbating pulmonary neutrophil-mediated inflammatory responses and contributing to systemic sepsis by binding to neutrophils to form platelet-neutrophil complexes (PNCs). PNC formation increases neutrophil recruitment, activation priming and extraversion of these immune cells into inflamed pulmonary tissue, thereby contributing to ARDS. Sequestered PNCs cause the development of a procoagulant and proinflammatory environment. The contribution to ARDS of increased extracellular histone levels, circulating mitochondrial DNA, the chromatin protein HMGB1, decreased neutrophil apoptosis, impaired macrophage efferocytosis, the cytokine storm, the toll-like receptor radical cycle, pyroptosis, necroinflammation, lymphopenia and a high Th17 to regulatory T lymphocyte ratio are detailed.
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Affiliation(s)
- Gerwyn Morris
- Deakin University, IMPACT – the Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Barwon Health, Geelong, Australia
| | - Chiara C. Bortolasci
- Deakin University, IMPACT – the Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Barwon Health, Geelong, Australia,Deakin University, Centre for Molecular and Medical Research, School of Medicine, Geelong, Australia,Corresponding author at: IMPACT – the Institute for Mental and Physical Health and Clinical Translation, Deakin University, 75 Pigdons Road, Waurn Ponds, Victoria 3218, Australia
| | | | - Lisa Olive
- Deakin University, IMPACT – the Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Barwon Health, Geelong, Australia,School of Psychology, Deakin University, Geelong, Australia
| | - Wolfgang Marx
- Deakin University, IMPACT – the Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Barwon Health, Geelong, Australia
| | - Adrienne O'Neil
- Deakin University, IMPACT – the Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Barwon Health, Geelong, Australia,Melbourne School of Population and Global Health, University of Melbourne, Melbourne, Australia
| | - Eugene Athan
- Deakin University, IMPACT – the Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Barwon Health, Geelong, Australia,Barwon Health, Geelong, Australia
| | - Andre F. Carvalho
- Deakin University, IMPACT – the Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Barwon Health, Geelong, Australia,Department of Psychiatry, University of Toronto, Toronto, Canada,Centre for Addiction and Mental Health (CAMH), Toronto, Canada
| | - Michael Maes
- Deakin University, IMPACT – the Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Barwon Health, Geelong, Australia,Department of Psychiatry, King Chulalongkorn University Hospital, Bangkok, Thailand,Department of Psychiatry, Medical University of Plovdiv, Plovdiv, Bulgaria
| | - Ken Walder
- Deakin University, IMPACT – the Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Barwon Health, Geelong, Australia,Deakin University, Centre for Molecular and Medical Research, School of Medicine, Geelong, Australia
| | - Michael Berk
- Deakin University, IMPACT – the Institute for Mental and Physical Health and Clinical Translation, School of Medicine, Barwon Health, Geelong, Australia,Orygen, The National Centre of Excellence in Youth Mental Health, Centre for Youth Mental Health, Florey Institute for Neuroscience and Mental Health and the Department of Psychiatry, The University of Melbourne, Melbourne, Australia
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18
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Majai GE, Gogolák P, Tóth M, Hodrea J, Horváth D, Fésüs L, Rajnavölgyi É, Bácsi A. Autologous apoptotic neutrophils inhibit inflammatory cytokine secretion by human dendritic cells, but enhance Th1 responses. FEBS Open Bio 2020; 10:1492-1502. [PMID: 32473089 PMCID: PMC7396436 DOI: 10.1002/2211-5463.12904] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 05/26/2020] [Indexed: 01/13/2023] Open
Abstract
Neutrophils represent the most abundant cell type in peripheral blood and exhibit a remarkably brief (6–8 h) half‐life in circulation. The fundamental role of these professional phagocytes has been established in acute inflammation, based on their potential to both initiate and receive inflammatory signals. Furthermore, neutrophils also take part in maintaining chronic inflammatory processes, such as in various autoimmune diseases. Here, we demonstrate that human autologous apoptotic neutrophils are readily engulfed by immature monocyte‐derived dendritic cells (moDCs) with similar efficiency as allogeneic apoptotic neutrophils [Majai G et al. (2010) J Leukoc Biol 88, 981–991]. Interestingly, in contrast to the allogeneic system, exposure of moDCs to autologous apoptotic neutrophils inhibits LPS + IFN‐γ‐induced production of inflammatory cytokines in a phagocytosis‐independent manner. Autologous apoptotic neutrophil‐primed DCs are able to modulate T‐cell responses by inducing the generation of IFN‐γ‐secreting cells while hampering that of IL‐17A‐producing cells. Our observations indicate that capture of autologous apoptotic neutrophils by immature DCs may impede further neutrophil‐mediated phagocytosis and tissue damage, and allow increased clearance of dying cells by macrophages.
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Affiliation(s)
- Gyöngyike Emese Majai
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Hungary
| | - Péter Gogolák
- Department of Immunology, Faculty of Medicine, University of Debrecen, Hungary
| | - Márta Tóth
- Department of Immunology, Faculty of Medicine, University of Debrecen, Hungary.,Doctoral School of Molecular Cellular and Immune Biology, University of Debrecen, Hungary
| | - Judit Hodrea
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Hungary
| | - Dorottya Horváth
- Department of Immunology, Faculty of Medicine, University of Debrecen, Hungary.,Doctoral School of Molecular Medicine, University of Debrecen, Hungary
| | - László Fésüs
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Debrecen, Hungary
| | - Éva Rajnavölgyi
- Department of Immunology, Faculty of Medicine, University of Debrecen, Hungary
| | - Attila Bácsi
- Department of Immunology, Faculty of Medicine, University of Debrecen, Hungary
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19
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Pulsed Electromagnetic Field Inhibits Synovitis via Enhancing the Efferocytosis of Macrophages. BIOMED RESEARCH INTERNATIONAL 2020; 2020:4307385. [PMID: 32596310 PMCID: PMC7273431 DOI: 10.1155/2020/4307385] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 03/06/2020] [Indexed: 01/15/2023]
Abstract
Synovitis plays an important role in the pathogenesis of arthritis, which is closely related to the joint swell and pain of patients. The purpose of this study was to investigate the anti-inflammatory effects of pulsed electromagnetic fields (PEMF) on synovitis and its underlying mechanisms. Destabilization of the medial meniscus (DMM) model and air pouch inflammation model were established to induce synovitis in C57BL/6 mice. The mice were then treated by PEMF (pulse waveform, 1.5 mT, 75 Hz, 10% duty cycle). The synovitis scores as well as the levels of IL-1β and TNF-α suggested that PEMF reduced the severity of synovitis in vivo. Moreover, the proportion of neutrophils in the synovial-like layer was decreased, while the proportion of macrophages increased after PEMF treatment. In addition, the phagocytosis of apoptotic neutrophils by macrophages (efferocytosis) was enhanced by PEMF. Furthermore, the data from western blot assay showed that the phosphorylation of P38 was inhibited by PEMF. In conclusion, our current data show that PEMF noninvasively exhibits the anti-inflammatory effect on synovitis via upregulation of the efferocytosis in macrophages, which may be involved in the phosphorylation of P38.
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20
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Zhang Y, Saradna A, Ratan R, Ke X, Tu W, Do DC, Hu C, Gao P. RhoA/Rho-kinases in asthma: from pathogenesis to therapeutic targets. Clin Transl Immunology 2020; 9:e01134. [PMID: 32355562 PMCID: PMC7190398 DOI: 10.1002/cti2.1134] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 04/08/2020] [Accepted: 04/08/2020] [Indexed: 12/13/2022] Open
Abstract
Asthma is a chronic and heterogeneous disease characterised by airway inflammation and intermittent airway narrowing. The key obstacle in the prevention and treatment of asthma has been our incomplete understanding of its aetiology and biological mechanisms. The ras homolog family member A (RhoA) of the Rho family GTPases has been considered to be one of the most promising and novel therapeutic targets for asthma. It is well known that RhoA/Rho‐kinases play an important role in the pathophysiology of asthma, including airway smooth muscle contraction, airway hyper‐responsiveness, β‐adrenergic desensitisation and airway remodelling. However, recent advances have suggested novel roles for RhoA in regulating allergic airway inflammation. Specifically, RhoA has been shown to regulate allergic airway inflammation through controlling Th2 or Th17 cell differentiation and to regulate airway remodelling through regulating mesenchymal stem cell (MSC) differentiation. In this review, we evaluate the literature regarding the recent advances in the activation of RhoA/Rho‐kinase, cytokine and epigenetic regulation of RhoA/Rho‐kinase, and the role of RhoA/Rho‐kinase in regulating major features of asthma, such as airway hyper‐responsiveness, remodelling and inflammation. We also discuss the importance of the newly identified role of RhoA/Rho‐kinase signalling in MSC differentiation and bronchial epithelial barrier dysfunction. These findings indicate the functional significance of the RhoA/Rho‐kinase pathway in the pathophysiology of asthma and suggest that RhoA/Rho‐kinase signalling may be a promising therapeutic target for the treatment of asthma.
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Affiliation(s)
- Yan Zhang
- Division of Allergy and Clinical Immunology Johns Hopkins University School of Medicine Baltimore MD USA.,Department of Respiratory Medicine Xiangya Hospital Central South University Changsha China
| | - Arjun Saradna
- Division of Allergy and Clinical Immunology Johns Hopkins University School of Medicine Baltimore MD USA.,Division of Pulmonary Critical Care and Sleep Medicine State University of New York at Buffalo Buffalo NY USA
| | - Rhea Ratan
- Division of Allergy and Clinical Immunology Johns Hopkins University School of Medicine Baltimore MD USA
| | - Xia Ke
- Division of Allergy and Clinical Immunology Johns Hopkins University School of Medicine Baltimore MD USA.,Department of Otorhinolaryngology First Affiliated Hospital of Chongqing Medical University Chongqing China
| | - Wei Tu
- Division of Allergy and Clinical Immunology Johns Hopkins University School of Medicine Baltimore MD USA.,Department of Respirology and Allergy Third Affiliated Hospital of Shenzhen University Shenzhen China
| | - Danh C Do
- Division of Allergy and Clinical Immunology Johns Hopkins University School of Medicine Baltimore MD USA
| | - Chengping Hu
- Department of Respiratory Medicine Xiangya Hospital Central South University Changsha China
| | - Peisong Gao
- Division of Allergy and Clinical Immunology Johns Hopkins University School of Medicine Baltimore MD USA
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21
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Rymut N, Heinz J, Sadhu S, Hosseini Z, Riley CO, Marinello M, Maloney J, MacNamara KC, Spite M, Fredman G. Resolvin D1 promotes efferocytosis in aging by limiting senescent cell-induced MerTK cleavage. FASEB J 2019; 34:597-609. [PMID: 31914705 DOI: 10.1096/fj.201902126r] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Revised: 10/08/2019] [Accepted: 10/09/2019] [Indexed: 12/31/2022]
Abstract
Inflammation-resolution is mediated by the balance between specialized pro-resolving mediators (SPMs) like resolvin D1 (RvD1) and pro-inflammatory factors, like leukotriene B4 (LTB4). A key cellular process of inflammation-resolution is efferocytosis. Aging is associated with defective inflammation-resolution and the accumulation of pro-inflammatory senescent cells (SCs). Therefore, understanding mechanism(s) that underpin this impairment is a critical gap. Here, using a model of hind limb ischemia-reperfusion (I/R) remote lung injury, we present evidence that aging is associated with heightened inflammation, impaired SPM:LT ratio, defective efferocytosis, and a decrease in MerTK levels in injured lungs. Treatment with RvD1 mitigated I/R lung injury in aging, promoted efferocytosis, and prevented the decrease of MerTK in injured lungs from old mice. Old MerTK cleavage-resistant mice (MerTKCR) exhibited less neutrophils or polymorpho nuclear cells infiltration and had improved efferocytosis compared with old WT controls. Mechanistically, macrophages that were treated with conditioned media (CM) from senescent cells had increased MerTK cleavage, impaired efferocytosis, and a defective RvD1:LTB4 ratio. Macrophages from MerTKCR mice were resistant to CM-induced efferocytosis defects and had an improved RvD1:LTB4 ratio. RvD1-stimulated macrophages prevented CM-induced MerTK cleavage and promoted efferocytosis. Together, these data suggest a new mechanism and a potential therapy to promote inflammation-resolution and efferocytosis in aging.
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Affiliation(s)
- Nicholas Rymut
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, USA
| | - Justin Heinz
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, USA
| | - Sudeshna Sadhu
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, USA
| | - Zeinab Hosseini
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, USA
| | - Colin O Riley
- Department of Anesthesiology, Perioperative and Pain Medicine, Center for Experimental Therapeutics and Reperfusion Injury, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Michael Marinello
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, USA
| | - Jackson Maloney
- The Department of Immunology and Microbial Disease, Albany Medical College, Albany, NY, USA
| | - Katherine C MacNamara
- The Department of Immunology and Microbial Disease, Albany Medical College, Albany, NY, USA
| | - Matthew Spite
- Department of Anesthesiology, Perioperative and Pain Medicine, Center for Experimental Therapeutics and Reperfusion Injury, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Gabrielle Fredman
- The Department of Molecular and Cellular Physiology, Albany Medical College, Albany, NY, USA
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22
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de Couto G, Jaghatspanyan E, DeBerge M, Liu W, Luther K, Wang Y, Tang J, Thorp EB, Marbán E. Mechanism of Enhanced MerTK-Dependent Macrophage Efferocytosis by Extracellular Vesicles. Arterioscler Thromb Vasc Biol 2019; 39:2082-2096. [PMID: 31434491 DOI: 10.1161/atvbaha.119.313115] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Extracellular vesicles secreted by cardiosphere-derived cells (CDCev) polarize macrophages toward a distinctive phenotype with enhanced phagocytic capacity (MCDCev). These changes underlie cardioprotection by CDCev and by the parent CDCs, notably attenuating the no-reflow phenomenon following myocardial infarction, but the mechanisms are unclear. Here, we tested the hypothesis that MCDCev are especially effective at scavenging debris from dying cells (ie, efferocytosis) to attenuate irreversible damage post-myocardial infarction. Approach and Results: In vitro efferocytosis assays with bone marrow-derived macrophages, and in vivo transgenic rodent models of myocardial infarction, demonstrate enhanced apoptotic cell clearance with MCDCev. CDCev exposure induces sustained MerTK expression in MCDCev through extracellular vesicle transfer of microRNA-26a (via suppression of Adam17); the cardioprotective response is lost in animals deficient in MerTK. Single-cell RNA-sequencing revealed phagocytic pathway activation in MCDCev, with increased expression of complement factor C1qa, a phagocytosis facilitator. CONCLUSIONS Together, these data demonstrate that extracellular vesicle modulation of MerTK and C1qa expression leads to enhanced macrophage efferocytosis and cardioprotection.
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Affiliation(s)
- Geoffrey de Couto
- From the Smidt Heart Institute (G.d.C., E.J., W.L., K.L., E.M.), Cedars-Sinai Medical Center, Los Angeles, CA
| | - Ervin Jaghatspanyan
- From the Smidt Heart Institute (G.d.C., E.J., W.L., K.L., E.M.), Cedars-Sinai Medical Center, Los Angeles, CA
| | | | - Weixin Liu
- From the Smidt Heart Institute (G.d.C., E.J., W.L., K.L., E.M.), Cedars-Sinai Medical Center, Los Angeles, CA
| | - Kristin Luther
- From the Smidt Heart Institute (G.d.C., E.J., W.L., K.L., E.M.), Cedars-Sinai Medical Center, Los Angeles, CA
| | - Yizhou Wang
- Genomics Core (Y.W., J.T.), Cedars-Sinai Medical Center, Los Angeles, CA
| | - Jie Tang
- Genomics Core (Y.W., J.T.), Cedars-Sinai Medical Center, Los Angeles, CA
| | | | - Eduardo Marbán
- From the Smidt Heart Institute (G.d.C., E.J., W.L., K.L., E.M.), Cedars-Sinai Medical Center, Los Angeles, CA
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Rungelrath V, Kobayashi SD, DeLeo FR. Neutrophils in innate immunity and systems biology-level approaches. WILEY INTERDISCIPLINARY REVIEWS-SYSTEMS BIOLOGY AND MEDICINE 2019; 12:e1458. [PMID: 31218817 DOI: 10.1002/wsbm.1458] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 05/22/2019] [Accepted: 05/23/2019] [Indexed: 12/14/2022]
Abstract
The innate immune system is the first line of host defense against invading microorganisms. Polymorphonuclear leukocytes (PMNs or neutrophils) are the most abundant leukocyte in humans and essential to the innate immune response against invading pathogens. Compared to the acquired immune response, which requires time to develop and is dependent on previous interaction with specific microbes, the ability of neutrophils to kill microorganisms is immediate, nonspecific, and not dependent on previous exposure to microorganisms. Historically, studies of PMN-pathogen interaction focused on the events leading to killing of microorganisms, such as recruitment/chemotaxis, transmigration, phagocytosis, and activation, whereas postphagocytosis sequelae were infrequently considered. In addition, it was widely accepted that human neutrophils possessed limited capacity for new gene transcription and thus, relatively little biosynthetic capacity. This notion has changed dramatically within the past 20 years. Further, there is now more effort directed to understand the events occurring in PMNs after killing of microbes. Herein, we give an updated review of the systems biology-level approaches that have been used to gain an enhanced view of the role of neutrophils during host-pathogen interaction and neutrophil-mediated diseases. We anticipate that these and future systems-level studies will continue to provide information important for understanding, treatment, and control of diseases caused by pathogenic microorganisms. This article is categorized under: Physiology > Organismal Responses to Environment Physiology > Mammalian Physiology in Health and Disease Biological Mechanisms > Cell Fates.
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Affiliation(s)
- Viktoria Rungelrath
- Laboratory of Bacteriology, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana
| | - Scott D Kobayashi
- Laboratory of Bacteriology, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana
| | - Frank R DeLeo
- Laboratory of Bacteriology, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana
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Voices from the dead: The complex vocabulary and intricate grammar of dead cells. ADVANCES IN PROTEIN CHEMISTRY AND STRUCTURAL BIOLOGY 2019; 116:1-90. [PMID: 31036289 DOI: 10.1016/bs.apcsb.2019.02.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Of the roughly one million cells per second dying throughout the body, the vast majority dies by apoptosis, the predominant form of regulated cell death in higher organisms. Long regarded as mere waste, apoptotic cells are now recognized as playing a prominent and active role in homeostatic maintenance, especially resolution of inflammation, and in the sculpting of tissues during development. The activities associated with apoptotic cells are continually expanding, with more recent studies demonstrating their ability to modulate such vital functions as proliferation, survival, differentiation, metabolism, migration, and angiogenesis. In each case, the role of apoptotic cells is active, exerting their effects via new activities acquired during the apoptotic program. Moreover, the capacity to recognize and respond to apoptotic cells is not limited to professional phagocytes. Most, if not all, cells receive and integrate an array of signals from cells dying in their vicinity. These signals comprise a form of biochemical communication. As reviewed in this chapter, this communication is remarkably sophisticated; each of its three critical steps-encoding, transmission, and decoding of the apoptotic cell's "message"-is endowed with exquisite robustness. Together, the abundance and intricacy of the variables at each step comprise the vocabulary and grammar of the language by which dead cells achieve their post-mortem voice. The combinatorial complexity of the resulting communication network permits dying cells, through the signals they emit and the responses those signals elicit, to partake of an expanded role in homeostasis, acting as both sentinels of environmental change and agents of adaptation.
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Li X, Darby J, Lyons AB, Woods GM, Körner H. TNF May Negatively Regulate Phagocytosis of Devil Facial Tumour Disease Cells by Activated Macrophages. Immunol Invest 2019; 48:691-703. [PMID: 30663448 DOI: 10.1080/08820139.2018.1515222] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Introduction: Macrophage phagocytosis of pathogens and tumour cells is an important early event in protection against infectious disease and cancer. As tumour necrosis factor α (TNF) is an important cytokine in macrophage activation, we investigated the involvement of TNF in macrophage phagocytosis of tumour cells. Methods: We used Devil Facial Tumour Disease (DFTD) cancer cells as the target tumour cells. The Tasmanian devil (Sarcophilus harrisii) population is threatened by the transmissible DFTD. Using DFTD cells provided the opportunity to determine if these cells can be phagocytosed and investigate requirement for TNF. As effector cells, bone marrow derived macrophages (BMDMs), generated from C57BL/6 wild type (B6.WT) and C57BL/6 TNF-/- (B6.TNF-/-) mice were used. Phagocytosis of DFTD cells was investigated by confocal microscopy and flow cytometry. Results: DFTD cells were consistently phagocytosed by B6.WT and B6.TNF-/- BMDMs with similar efficiency in vitro. Consequently the DFTD cells are not resistant to phagocytosis. Following activation by exposure to IFNγ and LPS or LPS alone, B6.TNF-/- BMDMs had higher phagocytic efficiency and lower nitric oxide (NO) production compared to wild-type controls. In addition, NO seems to be unlikely to be the involved in phagocytosis efficiency in IFNγ and LPS activated B6.TNF-/- macrophages and consequences thereof. Conclusion: Our results indicate that TNF is not required for IFNγ and LPS or LPS alone activation of macrophage phagocytosis. TNF may negatively regulate macrophage phagocytosis of tumour cells.
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Affiliation(s)
- Xinying Li
- Menzies Institute for Medical Research, College of Health and Medicine, University of Tasmania , Hobart , Tasmania , Australia.,School of Life Science, Anhui Medical University , Hefei , People's Republic of China
| | - Jocelyn Darby
- Menzies Institute for Medical Research, College of Health and Medicine, University of Tasmania , Hobart , Tasmania , Australia.,School of Medicine, College of Health and Medicine, University of Tasmania , Hobart , Tasmania , Australia
| | - A Bruce Lyons
- School of Medicine, College of Health and Medicine, University of Tasmania , Hobart , Tasmania , Australia
| | - Gregory M Woods
- Menzies Institute for Medical Research, College of Health and Medicine, University of Tasmania , Hobart , Tasmania , Australia.,School of Medicine, College of Health and Medicine, University of Tasmania , Hobart , Tasmania , Australia
| | - Heinrich Körner
- Menzies Institute for Medical Research, College of Health and Medicine, University of Tasmania , Hobart , Tasmania , Australia.,Key Laboratory of Anti-inflammatory and Immunopharmacology, Ministry of Education, Engineering Technology Research Centre of Anti-inflammatory and Immunodrugs in Anhui Province, Institute of Clinical Pharmacology, Anhui Medical University , Hefei, Anhui , People's Republic of China
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26
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Abstract
Reactive oxygen species (ROS) are well known for their role in mediating both physiological and pathophysiological signal transduction. Enzymes and subcellular compartments that typically produce ROS are associated with metabolic regulation, and diseases associated with metabolic dysfunction may be influenced by changes in redox balance. In this review, we summarize the current literature surrounding ROS and their role in metabolic and inflammatory regulation, focusing on ROS signal transduction and its relationship to disease progression. In particular, we examine ROS production in compartments such as the cytoplasm, mitochondria, peroxisome, and endoplasmic reticulum and discuss how ROS influence metabolic processes such as proteasome function, autophagy, and general inflammatory signaling. We also summarize and highlight the role of ROS in the regulation metabolic/inflammatory diseases including atherosclerosis, diabetes mellitus, and stroke. In order to develop therapies that target oxidative signaling, it is vital to understand the balance ROS signaling plays in both physiology and pathophysiology, and how manipulation of this balance and the identity of the ROS may influence cellular and tissue homeostasis. An increased understanding of specific sources of ROS production and an appreciation for how ROS influence cellular metabolism may help guide us in the effort to treat cardiovascular diseases.
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Affiliation(s)
- Steven J Forrester
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta GA
| | - Daniel S Kikuchi
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta GA
| | - Marina S Hernandes
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta GA
| | - Qian Xu
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta GA
| | - Kathy K Griendling
- From the Division of Cardiology, Department of Medicine, Emory University, Atlanta GA.
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27
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Davies SP, Reynolds GM, Stamataki Z. Clearance of Apoptotic Cells by Tissue Epithelia: A Putative Role for Hepatocytes in Liver Efferocytosis. Front Immunol 2018; 9:44. [PMID: 29422896 PMCID: PMC5790054 DOI: 10.3389/fimmu.2018.00044] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2017] [Accepted: 01/08/2018] [Indexed: 12/11/2022] Open
Abstract
Toxic substances and microbial or food-derived antigens continuously challenge the liver, which is tasked with their safe neutralization. This vital organ is also important for the removal of apoptotic immune cells during inflammation and has been previously described as a “graveyard” for dying lymphocytes. The clearance of apoptotic and necrotic cells is known as efferocytosis and is a critical liver function to maintain tissue homeostasis. Much of the research into this form of immunological control has focused on Kupffer cells, the liver-resident macrophages. However, hepatocytes (and other liver resident cells) are competent efferocytes and comprise 80% of the liver mass. Little is known regarding the mechanisms of apoptotic and necrotic cell capture by epithelia, which lack key receptors that mediate phagocytosis in macrophages. Herein, we discuss recent developments that increased our understanding of efferocytosis in tissues, with a special focus on the liver parenchyma. We discuss the impact of efferocytosis in health and in inflammation, highlighting the role of phagocytic epithelia.
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Affiliation(s)
- Scott P Davies
- Centre for Liver Research, College of Medical and Dental Sciences, Institute for Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
| | - Gary M Reynolds
- Centre for Liver Research, College of Medical and Dental Sciences, Institute for Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom.,Centre for Liver Research and National Institute for Health Research (NIHR) Birmingham Liver Biomedical Research Unit, College of Medical and Dental Sciences, Institute of Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom.,University Hospitals Birmingham NHS Foundation Trust, Birmingham, United Kingdom
| | - Zania Stamataki
- Centre for Liver Research, College of Medical and Dental Sciences, Institute for Immunology and Immunotherapy, University of Birmingham, Birmingham, United Kingdom
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28
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Abstract
The engulfment of apoptotic cells by phagocytes, a process referred to as efferocytosis, is essential for maintenance of normal tissue homeostasis and a prerequisite for the resolution of inflammation. Neutrophils are the predominant circulating white blood cell in humans, and contain an arsenal of toxic substances that kill and degrade microbes. Neutrophils are short-lived and spontaneously die by apoptosis. This review will highlight how the engulfment of apoptotic neutrophils by human phagocytes occurs, how heterogeneity of phagocyte populations influences efferocytosis signaling, and downstream consequences of efferocytosis. The efferocytosis of apoptotic neutrophils by macrophages promotes anti-inflammatory signaling, prevents neutrophil lysis, and dampens immune responses. Given the immunomodulatory properties of efferocytosis, understanding pathways that regulate and enhance efferocytosis could be harnessed to combat infection and chronic inflammatory conditions.
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Affiliation(s)
- Mallary C Greenlee-Wacker
- Inflammation Program, Department of Internal Medicine, Roy J. and Lucille A. Carver College of Medicine University of Iowa, Veterans Administration Medical Center, Iowa City, IA, USA
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29
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Seneviratne AN, Edsfeldt A, Cole JE, Kassiteridi C, Swart M, Park I, Green P, Khoyratty T, Saliba D, Goddard ME, Sansom SN, Goncalves I, Krams R, Udalova IA, Monaco C. Interferon Regulatory Factor 5 Controls Necrotic Core Formation in Atherosclerotic Lesions by Impairing Efferocytosis. Circulation 2017; 136:1140-1154. [PMID: 28698173 PMCID: PMC5598917 DOI: 10.1161/circulationaha.117.027844] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 06/13/2017] [Indexed: 12/18/2022]
Abstract
BACKGROUND Myeloid cells are central to atherosclerotic lesion development and vulnerable plaque formation. Impaired ability of arterial phagocytes to uptake apoptotic cells (efferocytosis) promotes lesion growth and establishment of a necrotic core. The transcription factor interferon regulatory factor (IRF)-5 is an important modulator of myeloid function and programming. We sought to investigate whether IRF5 affects the formation and phenotype of atherosclerotic lesions. METHODS We investigated the role of IRF5 in atherosclerosis in 2 complementary models. First, atherosclerotic lesion development in hyperlipidemic apolipoprotein E-deficient (ApoE-/-) mice and ApoE-/- mice with a genetic deletion of IRF5 (ApoE-/-Irf5-/-) was compared and then lesion development was assessed in a model of shear stress-modulated vulnerable plaque formation. RESULTS Both lesion and necrotic core size were significantly reduced in ApoE-/-Irf5-/- mice compared with IRF5-competent ApoE-/- mice. Necrotic core size was also reduced in the model of shear stress-modulated vulnerable plaque formation. A significant loss of CD11c+ macrophages was evident in ApoE-/-Irf5-/- mice in the aorta, draining lymph nodes, and bone marrow cell cultures, indicating that IRF5 maintains CD11c+ macrophages in atherosclerosis. Moreover, we revealed that the CD11c gene is a direct target of IRF5 in macrophages. In the absence of IRF5, CD11c- macrophages displayed a significant increase in expression of the efferocytosis-regulating integrin-β3 and its ligand milk fat globule-epidermal growth factor 8 protein and enhanced efferocytosis in vitro and in situ. CONCLUSIONS IRF5 is detrimental in atherosclerosis by promoting the maintenance of proinflammatory CD11c+ macrophages within lesions and controlling the expansion of the necrotic core by impairing efferocytosis.
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Affiliation(s)
- Anusha N Seneviratne
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Andreas Edsfeldt
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Jennifer E Cole
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Christina Kassiteridi
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Maarten Swart
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Inhye Park
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Patricia Green
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Tariq Khoyratty
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - David Saliba
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Michael E Goddard
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Stephen N Sansom
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Isabel Goncalves
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Rob Krams
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Irina A Udalova
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.)
| | - Claudia Monaco
- From Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, United Kingdom (A.N.S., A.E., J.E.C., C.K., M.S., I.P., P.G., T.K., D.S., M.E.G., S.N.S., I.A.U., C.M.); Department of Bioengineering, Imperial College London, United Kingdom (A.N.S., R.K.); Experimental Cardiovascular Research Unit, Clinical Research Centre, Clinical Sciences Malmö, Lund University, Sweden (A.E., I.G.); Department of Cardiology, Skåne University Hospital, Lund/Malmö, Sweden (A.E., I.G.); and School of Engineering and Materials Science, Queen Mary University of London, United Kingdom (R.K.).
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Abstract
In 1882, Elie Metchnikoff identified myeloid-like cells from starfish larvae responding to the invasion by a foreign body (rose thorn). This marked the origins for the study of innate immunity, and an appreciation that cellular immunity was well established even in these "primitive" organisms. This chapter focuses on these myeloid cells as well as the newest members of this family, the dendritic cells, and explores their evolutionary origins. Our goal is to provide evolutionary context for the development of the multilayered immune system of mammals, where myeloid cells now serve as central effectors of innate immunity and regulators of adaptive immunity. Overall, we find that core contributions of myeloid cells to the regulation of inflammation are based on mechanisms that have been honed over hundreds of millions of years of evolution. Using phagocytosis as a platform, we show how fairly simple beginnings have offered a robust foundation onto which additional control features have been integrated, resulting in central regulatory nodes that now manage multifactorial aspects of homeostasis and immunity.
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31
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Abstract
Chlamydiae are bacterial pathogens that grow in vacuolar inclusions. Dendritic cells (DCs) disintegrate these compartments, thereby eliminating the microbes, through auto/xenophagy, which also promotes chlamydial antigen presentation via MHC I. Here, we show that TNF-α controls this pathway by driving cytosolic phospholipase (cPLA)2-mediated arachidonic acid (AA) production. AA then impairs mitochondrial function, which disturbs the development and integrity of these energy-dependent parasitic inclusions, while a simultaneous metabolic switch towards aerobic glycolysis promotes DC survival. Tubulin deacetylase/autophagy regulator HDAC6 associates with disintegrated inclusions, thereby further disrupting their subcellular localisation and stability. Bacterial remnants are decorated with defective mitochondria, mito-aggresomal structures, and components of the ubiquitin/autophagy machinery before they are degraded via mito-xenophagy. The mechanism depends on cytoprotective HSP25/27, the E3 ubiquitin ligase Parkin and HDAC6 and promotes chlamydial antigen generation for presentation on MHC I. We propose that this novel mito-xenophagic pathway linking innate and adaptive immunity is critical for effective DC-mediated anti-bacterial resistance.
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32
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More Bayona JA, Karuppannan AK, Trites MJ, Barreda DR. Application of imaging flow cytometry for characterization of acute inflammation in non-classical animal model systems. Methods 2017; 112:167-174. [PMID: 27327146 DOI: 10.1016/j.ymeth.2016.06.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2016] [Revised: 06/04/2016] [Accepted: 06/16/2016] [Indexed: 11/28/2022] Open
Abstract
Phagocytes display marked heterogeneity in their capacity to induce and control acute inflammation. This has a significant impact on the effectiveness of antimicrobial immune responses at different tissue sites as well as their predisposition for inflammation-associated pathology. Imaging flow cytometry provides novel opportunities for characterization of these phagocyte populations through high spatial resolution, statistical robustness, and a broad range of quantitative morphometric cell analysis tools. This study highlights an integrative approach that brings together new tools in imaging flow cytometry with conventional methodologies for characterization of phagocyte responses during acute inflammation. We focus on a comparative avian in vivo challenge model to showcase the added depth gained through these novel quantitative multiparametric approaches even in the absence of antibody-based cellular markers. Our characterization of acute inflammation in this model shows significant conservation of phagocytic capacity among avian phagocytes compared to other animal models. However, it also highlights evolutionary divergence with regards to phagocyte inflammation control mechanisms based on the internalization of apoptotic cells.
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Affiliation(s)
- Juan A More Bayona
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2P5, Canada
| | - Anbu K Karuppannan
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5, Canada
| | - Michael J Trites
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2P5, Canada
| | - Daniel R Barreda
- Department of Biological Sciences, University of Alberta, Edmonton, Alberta T6G 2P5, Canada; Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta T6G 2P5, Canada.
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Short JD, Downs K, Tavakoli S, Asmis R. Protein Thiol Redox Signaling in Monocytes and Macrophages. Antioxid Redox Signal 2016; 25:816-835. [PMID: 27288099 PMCID: PMC5107717 DOI: 10.1089/ars.2016.6697] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
SIGNIFICANCE Monocyte and macrophage dysfunction plays a critical role in a wide range of inflammatory disease processes, including obesity, impaired wound healing diabetic complications, and atherosclerosis. Emerging evidence suggests that the earliest events in monocyte or macrophage dysregulation include elevated reactive oxygen species production, thiol modifications, and disruption of redox-sensitive signaling pathways. This review focuses on the current state of research in thiol redox signaling in monocytes and macrophages, including (i) the molecular mechanisms by which reversible protein-S-glutathionylation occurs, (ii) the identification of bona fide S-glutathionylated proteins that occur under physiological conditions, and (iii) how disruptions of thiol redox signaling affect monocyte and macrophage functions and contribute to atherosclerosis. Recent Advances: Recent advances in redox biochemistry and biology as well as redox proteomic techniques have led to the identification of many new thiol redox-regulated proteins and pathways. In addition, major advances have been made in expanding the list of S-glutathionylated proteins and assessing the role that protein-S-glutathionylation and S-glutathionylation-regulating enzymes play in monocyte and macrophage functions, including monocyte transmigration, macrophage polarization, foam cell formation, and macrophage cell death. CRITICAL ISSUES Protein-S-glutathionylation/deglutathionylation in monocytes and macrophages has emerged as a new and important signaling paradigm, which provides a molecular basis for the well-established relationship between metabolic disorders, oxidative stress, and cardiovascular diseases. FUTURE DIRECTIONS The identification of specific S-glutathionylated proteins as well as the mechanisms that control this post-translational protein modification in monocytes and macrophages will facilitate the development of new preventive and therapeutic strategies to combat atherosclerosis and other metabolic diseases. Antioxid. Redox Signal. 25, 816-835.
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Affiliation(s)
- John D Short
- 1 Department of Pharmacology, University of Texas Health Science Center at San Antonio , San Antonio, Texas
| | - Kevin Downs
- 2 Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio , San Antonio, Texas
| | - Sina Tavakoli
- 3 Department of Radiology, University of Texas Health Science Center at San Antonio , San Antonio, Texas
| | - Reto Asmis
- 4 Department of Clinical Laboratory Sciences, University of Texas Health Science Center at San Antonio , San Antonio, Texas.,5 Department of Biochemistry, University of Texas Health Science Center at San Antonio , San Antonio, Texas
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Selective activation of CB2 receptor improves efferocytosis in cultured macrophages. Life Sci 2016; 161:10-8. [DOI: 10.1016/j.lfs.2016.07.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Revised: 07/19/2016] [Accepted: 07/25/2016] [Indexed: 01/06/2023]
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Peña L, Meana C, Astudillo AM, Lordén G, Valdearcos M, Sato H, Murakami M, Balsinde J, Balboa MA. Critical role for cytosolic group IVA phospholipase A2 in early adipocyte differentiation and obesity. Biochim Biophys Acta Mol Cell Biol Lipids 2016; 1861:1083-1095. [PMID: 27317983 DOI: 10.1016/j.bbalip.2016.06.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 06/02/2016] [Accepted: 06/10/2016] [Indexed: 12/22/2022]
Abstract
Adipogenesis is the process of differentiation of immature mesenchymal stem cells into adipocytes. Elucidation of the mechanisms that regulate adipocyte differentiation is key for the development of novel therapies for the control of obesity and related comorbidities. Cytosolic group IVA phospholipase A2 (cPLA2α) is the pivotal enzyme in receptor-mediated arachidonic acid (AA) mobilization and attendant eicosanoid production. Using primary multipotent cells and cell lines predetermined to become adipocytes, we show here that cPLA2α displays a proadipogenic function that occurs very early in the adipogenic process. Interestingly, cPLA2α levels decrease during adipogenesis, but cPLA2α-deficient preadipocytes exhibit a reduced capacity to differentiate into adipocytes, which affects early and terminal adipogenic transcription factors. Additionally, the absence of the phospholipase alters proliferation and cell-cycle progression that takes place during adipogenesis. Preconditioning of preadipocytes with AA increases the adipogenic capacity of these cells. Moreover, animals deficient in cPLA2α show resistance to obesity when fed a high fat diet that parallels changes in the expression of adipogenic transcription factors of the adipose tissue. Collectively, these results show that preadipocyte cPLA2α activation is a hitherto unrecognized factor for adipogenesis in vitro and in vivo.
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Affiliation(s)
- Lucía Peña
- Instituto de Biología y Genética Molecular, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Valladolid, 47003, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), 28029 Madrid, Spain
| | - Clara Meana
- Instituto de Biología y Genética Molecular, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Valladolid, 47003, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), 28029 Madrid, Spain
| | - Alma M Astudillo
- Instituto de Biología y Genética Molecular, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Valladolid, 47003, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), 28029 Madrid, Spain
| | - Gema Lordén
- Instituto de Biología y Genética Molecular, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Valladolid, 47003, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), 28029 Madrid, Spain
| | - Martín Valdearcos
- Instituto de Biología y Genética Molecular, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Valladolid, 47003, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), 28029 Madrid, Spain
| | - Hiroyasu Sato
- Lipid Metabolism Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo 156-8506, Japan
| | - Makoto Murakami
- Lipid Metabolism Project, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo 156-8506, Japan; AMED-CREST, Japan Agency for Medical Research and Development, Tokyo 100-0004, Japan
| | - Jesús Balsinde
- Instituto de Biología y Genética Molecular, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Valladolid, 47003, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), 28029 Madrid, Spain
| | - María A Balboa
- Instituto de Biología y Genética Molecular, Consejo Superior de Investigaciones Científicas (CSIC), Universidad de Valladolid, 47003, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Spain; Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), 28029 Madrid, Spain.
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Gordon P, Okai B, Hoare JI, Erwig LP, Wilson HM. SOCS3 is a modulator of human macrophage phagocytosis. J Leukoc Biol 2016; 100:771-780. [PMID: 27106674 DOI: 10.1189/jlb.3a1215-554rr] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Accepted: 04/03/2016] [Indexed: 01/20/2023] Open
Abstract
Suppressor of cytokine signaling (SOCS) proteins are recognized as key feedback inhibitors modulating the inflammatory activities of macrophages, but comparatively little is known about whether and how they affect phagocytosis. Here, we evaluated the role of SOCS3 in driving the inflammatory phenotype and phagocytic uptake of apoptotic cells by human macrophages and the signaling pathways that are necessary for efficient phagocytosis. In M1-activated human monocyte-derived macrophages, SOCS3 silencing, using short interfering RNA technology, resulted in a decreased expression of proinflammatory markers and an increased expression of M2 macrophage markers. Strikingly, we demonstrated for the first time that SOCS3 knockdown significantly enhances the phagocytic capacity of M1 macrophages for carboxylate-modified beads and apoptotic neutrophils. With the use of live-cell video microscopy, we showed that SOCS3 knockdown radically affects the temporal dynamics of particle engulfment, enabling more rapid uptake of a second target and delaying postengulfment processing, as evidenced by deferred acquisition of phagosome maturation markers. SOCS3 knockdown impacts on phagocytosis through increased PI3K and Ras-related C3 botulinum toxin substrate 1 (Rac1) activity, pathways essential for engulfment and clearance of apoptotic cells. Enhanced phagocytosis in SOCS3-silenced cells was reversed by pharmacological PI3K inhibition. Furthermore, we revealed that actin polymerization, downstream of PI3K/Rac1 activation, was significantly altered in SOCS3-silenced cells, providing a mechanism for their greater phagocytic activity. The findings support a new model, whereby SOCS3 not only plays an important role in driving macrophage inflammatory responses but modulates key signaling pathways organizing the actin cytoskeleton to regulate the efficiency of phagocytic processes.
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Affiliation(s)
- Peter Gordon
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen, United Kingdom
| | - Blessing Okai
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen, United Kingdom
| | - Joseph I Hoare
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen, United Kingdom
| | - Lars P Erwig
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen, United Kingdom
| | - Heather M Wilson
- School of Medicine, Medical Sciences and Nutrition, University of Aberdeen, Institute of Medical Sciences, Foresterhill, Aberdeen, United Kingdom
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Suppression of macrophage-mediated phagocytosis of apoptotic cells by soluble β-glucan due to a failure of PKC-βII translocation. Int Immunopharmacol 2016; 31:195-9. [DOI: 10.1016/j.intimp.2015.12.028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2015] [Revised: 12/18/2015] [Accepted: 12/21/2015] [Indexed: 11/17/2022]
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Cytokines in atherosclerosis: Key players in all stages of disease and promising therapeutic targets. Cytokine Growth Factor Rev 2015; 26:673-85. [PMID: 26005197 PMCID: PMC4671520 DOI: 10.1016/j.cytogfr.2015.04.003] [Citation(s) in RCA: 327] [Impact Index Per Article: 36.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2015] [Accepted: 04/27/2015] [Indexed: 02/07/2023]
Abstract
Atherosclerosis, a chronic inflammatory disorder of the arteries, is responsible for most deaths in westernized societies with numbers increasing at a marked rate in developing countries. The disease is initiated by the activation of the endothelium by various risk factors leading to chemokine-mediated recruitment of immune cells. The uptake of modified lipoproteins by macrophages along with defective cholesterol efflux gives rise to foam cells associated with the fatty streak in the early phase of the disease. As the disease progresses, complex fibrotic plaques are produced as a result of lysis of foam cells, migration and proliferation of vascular smooth muscle cells and continued inflammatory response. Such plaques are stabilized by the extracellular matrix produced by smooth muscle cells and destabilized by matrix metalloproteinase from macrophages. Rupture of unstable plaques and subsequent thrombosis leads to clinical complications such as myocardial infarction. Cytokines are involved in all stages of atherosclerosis and have a profound influence on the pathogenesis of this disease. This review will describe our current understanding of the roles of different cytokines in atherosclerosis together with therapeutic approaches aimed at manipulating their actions.
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Shirai T, Hilhorst M, Harrison DG, Goronzy JJ, Weyand CM. Macrophages in vascular inflammation--From atherosclerosis to vasculitis. Autoimmunity 2015; 48:139-51. [PMID: 25811915 DOI: 10.3109/08916934.2015.1027815] [Citation(s) in RCA: 103] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The spectrum of vascular inflammatory disease ranges from atherosclerosis and hypertension, widespread conditions affecting large proportions of the population, to the vasculitides, rare syndromes leading to fast and irreversible organ failure. Atherosclerosis progresses over decades, inevitably proceeding through multiple phases of disease and causes its major complications when the vessel wall lesion ruptures, giving rise to lumen-occlusive atherothrombosis. Vasculitides of medium and large arteries progress rapidly, causing tissue ischemia through lumen-occlusive intimal hyperplasia. In both disease entities, macrophages play a decisive role in pathogenesis, but function in the context of other immune cells that direct their differentiation and their functional commitments. In atherosclerosis, macrophages are involved in the removal of lipids and tissue debris and make a critical contribution to tissue damage and wall remodeling. In several of the vasculitides, macrophages contribute to granuloma formation, a microstructural platform optimizing macrophage-T-cell interactions, antigen containment and inflammatory amplification. By virtue of their versatility and plasticity, macrophages are able to promote a series of pathogenic functions, ranging from the release of cytokines and enzymes, the production of reactive oxygen species, presentation of antigen and secretion of tissue remodeling factors. However, as short-lived cells that lack memory, macrophages are also amendable to reprogramming, making them promising targets for anti-inflammatory interventions.
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Affiliation(s)
- Tsuyoshi Shirai
- Division of Immunology and Rheumatology, Department of Medicine, Stanford University School of Medicine , Stanford, CA , USA and
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Yang Y, Jiang G, Zhang P, Fan J. Programmed cell death and its role in inflammation. Mil Med Res 2015; 2:12. [PMID: 26045969 PMCID: PMC4455968 DOI: 10.1186/s40779-015-0039-0] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 05/11/2015] [Indexed: 12/13/2022] Open
Abstract
Cell death plays an important role in the regulation of inflammation and may be the result of inflammation. The maintenance of tissue homeostasis necessitates both the recognition and removal of invading microbial pathogens as well as the clearance of dying cells. In the past few decades, emerging knowledge on cell death and inflammation has enriched our molecular understanding of the signaling pathways that mediate various programs of cell death and multiple types of inflammatory responses. This review provides an overview of the major types of cell death related to inflammation. Modification of cell death pathways is likely to be a logical therapeutic target for inflammatory diseases.
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Affiliation(s)
- Yong Yang
- Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213 USA ; Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, 200433 China
| | - Gening Jiang
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, 200433 China
| | - Peng Zhang
- Department of Thoracic Surgery, Shanghai Pulmonary Hospital, Tongji University School of Medicine, Shanghai, 200433 China
| | - Jie Fan
- Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, PA 15213 USA ; Research and Development, Veterans Affairs Pittsburgh Healthcare System, Pittsburgh, PA 15240 USA
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Ansari SA, Devi S, Tenguria S, Kumar A, Ahmed N. Helicobacter pylori protein HP0986 (TieA) interacts with mouse TNFR1 and triggers proinflammatory and proapoptotic signaling pathways in cultured macrophage cells (RAW 264.7). Cytokine 2014; 68:110-7. [DOI: 10.1016/j.cyto.2014.03.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2013] [Revised: 02/09/2014] [Accepted: 03/24/2014] [Indexed: 12/12/2022]
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Kim SH, Sutherland ER, Gelfand EW. Is there a link between obesity and asthma? ALLERGY, ASTHMA & IMMUNOLOGY RESEARCH 2014; 6:189-95. [PMID: 24843792 PMCID: PMC4021235 DOI: 10.4168/aair.2014.6.3.189] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/12/2013] [Accepted: 12/10/2013] [Indexed: 12/15/2022]
Abstract
Increasing epidemiological data identify a link between obesity and asthma incidence and severity. Based on experimental data, it is possible that shared inflammatory mechanisms play a role in determining this linkage. Although controversial, the role of adipokines may be central to this association and the maintenance of the asthma phenotype. While leptin and adiponectin have a causal link to experimental asthma in mice, data in humans are less conclusive. Recent studies demonstrate that adipokines can regulate the survival and function of eosinophils and that these factors can affect eosinophil trafficking from the bone marrow to the airways. In addition, efferocytosis, the clearance of dead cells, by airway macrophages or blood monocytes appears impaired in obese asthmatics and is inversely correlated with glucocorticoid responsiveness. This review examines the potential mechanisms linking obesity to asthma.
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Affiliation(s)
- Sang-Ha Kim
- Department of Pediatrics, National Jewish Health, Denver, Colorado, USA
- Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea
| | | | - Erwin W. Gelfand
- Department of Pediatrics, National Jewish Health, Denver, Colorado, USA
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Abstract
A growing body of literature suggests that obesity has a significant impact on asthma risk, phenotype, and prognosis. Epidemiological studies have clearly demonstrated that asthma is more likely to occur in obese patients, and health status is impaired in obese individuals with asthma, with obese asthmatics experiencing more symptoms, worse quality of life, increased healthcare use, and increased asthma severity. However, obesity has well-described effects on lung function and mechanics that can lead to symptoms of dyspnea without causing the pathophysiologic changes of asthma. Adding to the challenges of evaluating this association, some studies have failed to demonstrate a robust relationship between obesity and traditional biomarkers of airway inflammation in adult asthmatics, leading to the conclusion that obesity does not necessarily worsen airway inflammation in asthma. In this regard, emerging data suggest that nonatopic mechanisms may be relevant in obese asthmatics, and that these mechanisms may have a direct impact on the response of obese asthmatics to asthma therapies, most notably inhaled glucocorticoids. This article will review selected aspects of the contributions of obesity-related airway and systemic inflammation to asthma, with a focus on the impact of obesity as a modifier of risk, prognosis, and therapeutic response in asthma.
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Affiliation(s)
- E Rand Sutherland
- National Jewish Health and University of Colorado School of Medicine, Denver, Colorado
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Abstract
The prompt removal of apoptotic cells by phagocytes is important for maintaining tissue homeostasis. The molecular and cellular events that underpin apoptotic cell recognition and uptake, and the subsequent biological responses, are increasingly better defined. The detection and disposal of apoptotic cells generally promote an anti-inflammatory response at the tissue level, as well as immunological tolerance. Consequently, defects in apoptotic cell clearance have been linked with various inflammatory diseases and autoimmunity. Conversely, under certain conditions, such as the killing of tumour cells by specific cell-death inducers, the recognition of apoptotic tumour cells can promote an immunogenic response and antitumour immunity. Here, we review the current understanding of the complex process of apoptotic cell clearance in physiology and pathology, and discuss how this knowledge could be harnessed for new therapeutic strategies.
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Das A, Ganesh K, Khanna S, Sen CK, Roy S. Engulfment of apoptotic cells by macrophages: a role of microRNA-21 in the resolution of wound inflammation. THE JOURNAL OF IMMUNOLOGY 2014; 192:1120-9. [PMID: 24391209 DOI: 10.4049/jimmunol.1300613] [Citation(s) in RCA: 229] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
At an injury site, efficient clearance of apoptotic cells by wound macrophages or efferocytosis is a prerequisite for the timely resolution of inflammation. Emerging evidence indicates that microRNA-21 (miR-21) may regulate the inflammatory response. In this work, we sought to elucidate the significance of miR-21 in the regulation of efferocytosis-mediated suppression of innate immune response, a key process implicated in resolving inflammation following injury. An increased expression of inducible miR-21 was noted in postefferocytotic peripheral blood monocyte-derived macrophages. Such induction of miR-21 was associated with silencing of its target genes PTEN and PDCD4. Successful efferocytosis of apoptotic cells by monocyte-derived macrophages resulted in the suppression of LPS-induced NF-κB activation and TNF-α expression. Interestingly, bolstering of miR-21 levels alone, using miR mimic, resulted in significant suppression of LPS-induced TNF-α expression and NF-κB activation. We report that efferocytosis-induced miR-21, by silencing PTEN and GSK3β, tempers the LPS-induced inflammatory response. Macrophage efferocytosis is known to trigger the release of anti-inflammatory cytokine IL-10. This study demonstrates that following successful efferocytosis, miR-21 induction in macrophages silences PDCD4, favoring c-Jun-AP-1 activity, which in turn results in elevated production of anti-inflammatory IL-10. In summary, this work provides direct evidence implicating miRNA in the process of turning on an anti-inflammatory phenotype in the postefferocytotic macrophage. Elevated macrophage miR-21 promotes efferocytosis and silences target genes PTEN and PDCD4, which in turn accounts for a net anti-inflammatory phenotype. Findings of this study highlight the significance of miRs in the resolution of wound inflammation.
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Affiliation(s)
- Amitava Das
- Department of Surgery, Davis Heart and Lung Research Institute, Center for Regenerative Medicine and Cell Based Therapies and Comprehensive Wound Center, The Ohio State University Wexner Medical Center, Columbus, OH 43210
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Noda N, Matsumoto K, Fukuyama S, Asai Y, Kitajima H, Seki N, Matsunaga Y, Kan-o K, Moriwaki A, Morimoto K, Inoue H, Nakanishi Y. Cigarette smoke impairs phagocytosis of apoptotic neutrophils by alveolar macrophages via inhibition of the histone deacetylase/Rac/CD9 pathways. Int Immunol 2013; 25:643-50. [DOI: 10.1093/intimm/dxt033] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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Bimczok D, Smythies LE, Waites KB, Grams JM, Stahl RD, Mannon PJ, Peter S, Wilcox CM, Harris PR, Das S, Ernst PB, Smith PD. Helicobacter pylori infection inhibits phagocyte clearance of apoptotic gastric epithelial cells. THE JOURNAL OF IMMUNOLOGY 2013; 190:6626-34. [PMID: 23686492 DOI: 10.4049/jimmunol.1203330] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Increased apoptotic death of gastric epithelial cells is a hallmark of Helicobacter pylori infection, and altered epithelial cell turnover is an important contributor to gastric carcinogenesis. To address the fate of apoptotic gastric epithelial cells and their role in H. pylori mucosal disease, we investigated phagocyte clearance of apoptotic gastric epithelial cells in H. pylori infection. Human gastric mononuclear phagocytes were analyzed for their ability to take up apoptotic epithelial cells (AECs) in vivo using immunofluorescence analysis. We then used primary human gastric epithelial cells induced to undergo apoptosis by exposure to live H. pylori to study apoptotic cell uptake by autologous monocyte-derived macrophages. We show that HLA-DR(+) mononuclear phagocytes in human gastric mucosa contain cytokeratin-positive and TUNEL-positive AEC material, indicating that gastric phagocytes are involved in AEC clearance. We further show that H. pylori both increased apoptosis in primary gastric epithelial cells and decreased phagocytosis of the AECs by autologous monocyte-derived macrophages. Reduced macrophage clearance of apoptotic cells was mediated in part by H. pylori-induced macrophage TNF-α, which was expressed at higher levels in H. pylori-infected, compared with uninfected, gastric mucosa. Importantly, we show that H. pylori-infected gastric mucosa contained significantly higher numbers of AECs and higher levels of nonphagocytosed TUNEL-positive apoptotic material, consistent with a defect in apoptotic cell clearance. Thus, as shown in other autoimmune and chronic inflammatory diseases, insufficient phagocyte clearance may contribute to the chronic and self-perpetuating inflammation in human H. pylori infection.
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Affiliation(s)
- Diane Bimczok
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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Bell C, English L, Boulais J, Chemali M, Caron-Lizotte O, Desjardins M, Thibault P. Quantitative proteomics reveals the induction of mitophagy in tumor necrosis factor-α-activated (TNFα) macrophages. Mol Cell Proteomics 2013; 12:2394-407. [PMID: 23674617 DOI: 10.1074/mcp.m112.025775] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Macrophages play an important role in innate and adaptive immunity as professional phagocytes capable of internalizing and degrading pathogens to derive antigens for presentation to T cells. They also produce pro-inflammatory cytokines such as tumor necrosis factor alpha (TNF-α) that mediate local and systemic responses and direct the development of adaptive immunity. The present work describes the use of label-free quantitative proteomics to profile the dynamic changes of proteins from resting and TNF-α-activated mouse macrophages. These analyses revealed that TNF-α activation of macrophages led to the down-regulation of mitochondrial proteins and the differential regulation of several proteins involved in vesicle trafficking and immune response. Importantly, we found that the down-regulation of mitochondria proteins occurred through mitophagy and was specific to TNF-α, as other cytokines such as IL-1β and IFN-γ had no effect on mitochondria degradation. Furthermore, using a novel antigen presentation system, we observed that the induction of mitophagy by TNF-α enabled the processing and presentation of mitochondrial antigens at the cell surface by MHC class I molecules. These findings highlight an unsuspected role of TNF-α in mitophagy and expanded our understanding of the mechanisms responsible for MHC presentation of self-antigens.
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Affiliation(s)
- Christina Bell
- Institute for Research in Immunology and Cancer, Université de Montréal, P.O. Box 6128, Station Centre-ville, Montréal, Québec, Canada H3C 3J7
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Keratinocyte-specific deletion of the receptor RAGE modulates the kinetics of skin inflammation in vivo. J Invest Dermatol 2013; 133:2400-2406. [PMID: 23594597 DOI: 10.1038/jid.2013.185] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2012] [Revised: 02/26/2013] [Accepted: 03/15/2013] [Indexed: 02/07/2023]
Abstract
The receptor for advanced glycation end products (RAGE) is a pattern recognition receptor causally related to the pathogenesis of acute and chronic inflammation. In a mouse model of inflammation-driven skin carcinogenesis, RAGE deletion conferred protection from the development of skin tumors due to a severely impaired cutaneous inflammation. Although the impact of RAGE expression in immune cells was shown to be essential for the maintenance of a cutaneous inflammatory reaction, the role of RAGE in keratinocytes remained unsolved. Using mice harboring a keratinocyte-specific deletion of RAGE, we analyzed its role in the regulation of an acute inflammatory response that was induced by topical treatment of the back skin with the phorbol ester 12-O-tetradecanoyl-phorbol-13-acetate (TPA). We show that RAGE expression in cutaneous keratinocytes modulates the strength and kinetics of acute inflammation and supports the maintenance of epidermal keratinocyte activation. To address the underlying molecular mechanism, we isolated interfollicular epidermis by laser microdissection for gene expression analysis, and identified RAGE as a regulator in the temporal control of TPA-induced epidermal tumor necrosis factor alpha transcript levels. In summary, our data demonstrate that RAGE expression in keratinocytes is critically involved in the perpetuation of acute inflammation and support the central role of RAGE in paracrine communication between keratinocytes and stromal immune cells.
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