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Chalise U, Becirovic‐Agic M, Lindsey ML. The cardiac wound healing response to myocardial infarction. WIREs Mech Dis 2023; 15:e1584. [PMID: 36634913 PMCID: PMC10077990 DOI: 10.1002/wsbm.1584] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 03/31/2022] [Accepted: 05/18/2022] [Indexed: 01/14/2023]
Abstract
Myocardial infarction (MI) is defined as evidence of myocardial necrosis consistent with prolonged ischemia. In response to MI, the myocardium undergoes a series of wound healing events that initiate inflammation and shift to anti-inflammation before transitioning to tissue repair that culminates in scar formation to replace the region of the necrotic myocardium. The overall response to MI is determined by two major steps, the first of which is the secretion of proteases by infiltrating leukocytes to breakdown extracellular matrix (ECM) components, a necessary step to remove necrotic cardiomyocytes. The second step is the generation of new ECM that comprises the scar; and this step is governed by the cardiac fibroblasts as the major source of new ECM synthesis. The leukocyte component resides in the middle of the two-step process, contributing to both sides as the leukocytes transition from pro-inflammatory to anti-inflammatory and reparative cell phenotypes. The balance between the two steps determines the final quantity and quality of scar formed, which in turn contributes to chronic outcomes following MI, including the progression to heart failure. This review will summarize our current knowledge regarding the cardiac wound healing response to MI, primarily focused on experimental models of MI in mice. This article is categorized under: Cardiovascular Diseases > Molecular and Cellular Physiology Immune System Diseases > Molecular and Cellular Physiology.
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Affiliation(s)
- Upendra Chalise
- Department of Cellular and Integrative Physiology, Center for Heart and Vascular ResearchUniversity of Nebraska Medical CenterOmahaNebraskaUSA
- Research ServiceNebraska‐Western Iowa Health Care SystemOmahaNebraskaUSA
| | - Mediha Becirovic‐Agic
- Department of Cellular and Integrative Physiology, Center for Heart and Vascular ResearchUniversity of Nebraska Medical CenterOmahaNebraskaUSA
- Research ServiceNebraska‐Western Iowa Health Care SystemOmahaNebraskaUSA
| | - Merry L. Lindsey
- Department of Cellular and Integrative Physiology, Center for Heart and Vascular ResearchUniversity of Nebraska Medical CenterOmahaNebraskaUSA
- Research ServiceNebraska‐Western Iowa Health Care SystemOmahaNebraskaUSA
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2
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Kim Y, Koo TM, Thangam R, Kim MS, Jang WY, Kang N, Min S, Kim SY, Yang L, Hong H, Jung HJ, Koh EK, Patel KD, Lee S, Fu HE, Jeon YS, Park BC, Kim SY, Park S, Lee J, Gu L, Kim DH, Kim TH, Lee KB, Jeong WK, Paulmurugan R, Kim YK, Kang H. Submolecular Ligand Size and Spacing for Cell Adhesion. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2110340. [PMID: 35476306 DOI: 10.1002/adma.202110340] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 03/27/2022] [Indexed: 06/14/2023]
Abstract
Cell adhesion occurs when integrin recognizes and binds to Arg-Gly-Asp (RGD) ligands present in fibronectin. In this work, submolecular ligand size and spacing are tuned via template-mediated in situ growth of nanoparticles for dynamic macrophage modulation. To tune liganded gold nanoparticle (GNP) size and spacing from 3 to 20 nm, in situ localized assemblies of GNP arrays on nanomagnetite templates are engineered. 3 nm-spaced ligands stimulate the binding of integrin, which mediates macrophage-adhesion-assisted pro-regenerative polarization as compared to 20 nm-spaced ligands, which can be dynamically anchored to the substrate for stabilizing integrin binding and facilitating dynamic macrophage adhesion. Increasing the ligand size from 7 to 20 nm only slightly promotes macrophage adhesion, not observed with 13 nm-sized ligands. Increasing the ligand spacing from 3 to 17 nm significantly hinders macrophage adhesion that induces inflammatory polarization. Submolecular tuning of ligand spacing can dominantly modulate host macrophages.
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Affiliation(s)
- Yuri Kim
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Thomas Myeongseok Koo
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Ramar Thangam
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
- Institute for High Technology Materials and Devices, Korea University, Seoul, 02841, Republic of Korea
| | - Myeong Soo Kim
- Institute for High Technology Materials and Devices, Korea University, Seoul, 02841, Republic of Korea
| | - Woo Young Jang
- Department of Orthopedic Surgery, Korea University Anam Hospital, Seoul, 02841, Republic of Korea
| | - Nayeon Kang
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Sunhong Min
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Seong Yeol Kim
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Letao Yang
- Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ, 08854, USA
| | - Hyunsik Hong
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Hee Joon Jung
- Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA
- International Institute for Nanotechnology, Evanston, IL, 60208, USA
- NUANCE Center, Northwestern University, Evanston, IL, 60208, USA
| | - Eui Kwan Koh
- Seoul Center, Korea Basic Science Institute, 145 Anam-Ro, Seongbuk-Gu, Seoul, 02841, Republic of Korea
| | - Kapil D Patel
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
- Institute for High Technology Materials and Devices, Korea University, Seoul, 02841, Republic of Korea
| | - Sungkyu Lee
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Hong En Fu
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Yoo Sang Jeon
- Institute of Engineering Research, Korea University, Seoul, 02841, Republic of Korea
| | - Bum Chul Park
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Soo Young Kim
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
- Institute for High Technology Materials and Devices, Korea University, Seoul, 02841, Republic of Korea
| | - Steve Park
- Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 34141, Republic of Korea
| | - Junmin Lee
- Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Luo Gu
- Department of Materials Science and Engineering and Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - Dong-Hyun Kim
- Department of Radiology, Feinberg School of Medicine, Northwestern University, Chicago, IL, 60611, USA
| | - Tae-Hyung Kim
- School of Integrative Engineering, Chung-Ang University, Seoul, 06974, Republic of Korea
| | - Ki-Bum Lee
- Department of Chemistry and Chemical Biology, Rutgers University, Piscataway, NJ, 08854, USA
| | - Woong Kyo Jeong
- Department of Orthopedic Surgery, Korea University Anam Hospital, Seoul, 02841, Republic of Korea
| | - Ramasamy Paulmurugan
- Department of Radiology, Molecular Imaging Program at Stanford, Stanford University School of Medicine, Stanford University, Palo Alto, CA, 94304, USA
- Department of Radiology, Canary Center at Stanford for Cancer Early Detection, Stanford University School of Medicine, Stanford University, Palo Alto, CA, 94304, USA
| | - Young Keun Kim
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
| | - Heemin Kang
- Department of Materials Science and Engineering, Korea University, Seoul, 02841, Republic of Korea
- Department of Biomicrosystem Technology, Korea University, Seoul, 02841, Republic of Korea
- Institute of Green Manufacturing Technology, Korea University, Seoul, 02841, Republic of Korea
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3
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Xu D, Wan Y, Li Z, Wang C, Zou Q, Du C, Wang Y. Tailorable hierarchical structures of biomimetic hydroxyapatite micro/nano particles promoting endocytosis and osteogenic differentiation of stem cells. Biomater Sci 2020; 8:3286-3300. [PMID: 32490486 DOI: 10.1039/d0bm00443j] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Hydroxyapatite (HA) micro/nano particles show great promise as artificial bone and dental substitutes, or drug carrier systems. However, the precise regulation of hydroxyapatite micro/nano particles with controllable physicochemical properties (such as hierarchical structure, particle size, potential and crystallinity) is still a challenge. Furthermore, the effects of different hierarchical structures on biological responses have been rarely reported. Herein, the HA particles with a precisely tailored micro/nano hierarchical structure have been developed using an elaborate biomimetic synthesis technology. Three representative particles, namely, micro/nano needle-like HA particles, micro/nano rod-like HA particles, and micro/nano flake-like HA particles, were featured to evaluate their biological responses to stem cells. The pore structure facilitated the adsorption of serum adhesive proteins, which together with the unique hierarchical architecture of micro/nano flake-like HA particles remarkably promoted the endocytosis efficiency in a concentration-dependent manner. The qRT-PCR together with RNA-seq and western blot analyses showed that micro/nano flake-like HA particles more significantly up-regulated the expression of genes and production of proteins related to osteogenic differentiation among the three particles through the activated ERK/MAPK signalling pathway. RNA-seq further revealed a complex mechanism of cell interface events, suggesting that the hierarchical architecture of HA particles is of crucial importance for the regulation of actin cytoskeleton involved in the modulation of cell adhesion which positively stimulated osteogenic differentiation of stem cells. Moreover, the endocytosis of particles into lysosomes resulted in an increase in the intracellular Ca2+ levels, which activated possible intracellular Ca2+-mediated signaling cascades (Ras/cAMP/Rap1/MAPK signaling pathways) related to osteogenic differentiation of stem cells. Our findings shed light on the effects of different hierarchical structures of HA particles on stem cell differentiation and contribute to the optimal design of implant materials.
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Affiliation(s)
- Dong Xu
- Department of Biomedical Engineering, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, PR China.
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4
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Law SM, Stanfield SJ, Hardisty GR, Dransfield I, Campbell CJ, Gray RD. Human cystic fibrosis monocyte derived macrophages display no defect in acidification of phagolysosomes when measured by optical nanosensors. J Cyst Fibros 2020; 19:203-210. [PMID: 31501051 DOI: 10.1016/j.jcf.2019.09.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Revised: 09/03/2019] [Accepted: 09/03/2019] [Indexed: 12/17/2022]
Abstract
BACKGROUND Defective macrophage phagolysosomal acidification is implicated in numerous lung diseases including Cystic Fibrosis (CF) and may contribute to defective pathogen killing. Conflicting reports relating to phagolysosomal pH in CF macrophages have been published, in part related to the use of pH-sensitive fluorescent probes where potential inadequacies in experimental design can be a contributing factor (e.g. employing probes with incorrect pKa for the cellular compartment of interest). We developed a reliable method to quantify macrophage phagolysosomal pH using surface-enhanced Raman spectroscopy-based nanosensors. METHODS Monocyte-derived macrophages from CF and healthy control participants were incubated with nanosensors. Live cell imaging identified phagocytosed nanosensors, and surface-enhanced Raman spectroscopy was performed using para-mercaptobenzoic acid functionalised gold nanoparticles which produce Raman spectra that change predictably with their environmental pH. Conventional fluorescence spectroscopy was carried out in comparison. Nanosensor localisation to phagolysosomes was confirmed by transmission electron microscopy. RESULTS Nanosensors were actively phagocytosed by macrophages into phagolysosomes and acidification occurred rapidly and remained stable for at least 60 min. There was no difference in phagolysosomal pH between healthy control and CF macrophages (5.41 ± 0.11 vs. 5.41 ± 0.20, p > .9999), further confirmed by inhibiting Cystic Fibrosis Transmembrane Conductance Regulator in healthy control monocyte-derived macrophages. CONCLUSIONS Optical nanosensors accurately measure macrophage phagolysosomal pH and demonstrate no phagolysosomal acidification defect in human CF monocyte-derived macrophages. Further studies using alveolar macrophages could extend the impact of our findings. Nanosensors represent a novel and precise means to measure organelle functions with widespread potential for the study and monitoring of several lung diseases.
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Affiliation(s)
- Sheonagh M Law
- Centre for Inflammation Research, The Queen's Medical Research Institute, 47 Little France Crescent, The University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Samuel J Stanfield
- Joseph Black Building, The University of Edinburgh, David Brewster Rd, Edinburgh EH9 3FJ, UK
| | - Gareth R Hardisty
- Centre for Inflammation Research, The Queen's Medical Research Institute, 47 Little France Crescent, The University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Ian Dransfield
- Centre for Inflammation Research, The Queen's Medical Research Institute, 47 Little France Crescent, The University of Edinburgh, Edinburgh EH16 4TJ, UK
| | - Colin J Campbell
- Joseph Black Building, The University of Edinburgh, David Brewster Rd, Edinburgh EH9 3FJ, UK
| | - Robert D Gray
- Centre for Inflammation Research, The Queen's Medical Research Institute, 47 Little France Crescent, The University of Edinburgh, Edinburgh EH16 4TJ, UK.
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5
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Arienti S, Barth ND, Dorward DA, Rossi AG, Dransfield I. Regulation of Apoptotic Cell Clearance During Resolution of Inflammation. Front Pharmacol 2019; 10:891. [PMID: 31456686 PMCID: PMC6701246 DOI: 10.3389/fphar.2019.00891] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 07/15/2019] [Indexed: 01/17/2023] Open
Abstract
Programmed cell death (apoptosis) has an important role in the maintenance of tissue homeostasis as well as the progression and ultimate resolution of inflammation. During apoptosis, the cell undergoes morphological and biochemical changes [e.g., phosphatidylserine (PtdSer) exposure, caspase activation, changes in mitochondrial membrane potential and DNA cleavage] that act to shut down cellular function and mark the cell for phagocytic clearance. Tissue phagocytes bind and internalize apoptotic cells, bodies, and vesicles, providing a mechanism for the safe disposal of apoptotic material. Phagocytic removal of apoptotic cells before they undergo secondary necrosis reduces the potential for bystander damage to adjacent tissue and importantly initiates signaling pathways within the phagocytic cell that act to dampen inflammation. In a pathological context, excessive apoptosis or failure to clear apoptotic material results in secondary necrosis with the release of pro-inflammatory intracellular contents. In this review, we consider some of the mechanisms by which phagocytosis of apoptotic cells can be controlled. We suggest that matching apoptotic cell load with the capacity for apoptotic cell clearance within tissues may be important for therapeutic strategies that target the apoptotic process for treatment of inflammatory disease.
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Affiliation(s)
- Simone Arienti
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Nicole D Barth
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - David A Dorward
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Adriano G Rossi
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Ian Dransfield
- Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
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6
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Lee J, Park B, Moon B, Park J, Moon H, Kim K, Lee SA, Kim D, Min C, Lee DH, Lee G, Park D. A scaffold for signaling of Tim-4-mediated efferocytosis is formed by fibronectin. Cell Death Differ 2018; 26:1646-1655. [PMID: 30451988 DOI: 10.1038/s41418-018-0238-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 10/21/2018] [Accepted: 10/29/2018] [Indexed: 01/22/2023] Open
Abstract
An essential step during clearance of apoptotic cells is the recognition of phosphatidylserine (PS) exposed on apoptotic cells by its receptors on phagocytes. Tim-4 directly binding to PS and functioning as a tethering receptor for phagocytosis of apoptotic cells has been extensively studied over the past decade. However, the molecular mechanisms by which Tim-4 collaborates with other engulfment receptors during efferocytosis remain elusive. By comparing efferocytosis induced by Tim-4 with that by Anxa5-GPI, an artificial tethering receptor, we found that Tim-4 possesses auxiliary machinery to induce a higher level of efferocytosis than Anxa5-GPI. To search for that, we performed a yeast two-hybrid screen and identified Fibronectin (Fn1) as a novel Tim-4-associating protein. Tim-4 directly associated with Fn1 and formed a complex with integrins via the association of Fn1. Through Tim-4-/- mice and cell-based assays, we found that modulation of the Fn1 level affected efferocytosis induced by Tim-4 and disruption of the interaction between Tim-4 and Fn1 abrogated Tim-4-mediated efferocytosis. In addition, Tim-4 depletion attenuated integrin signaling activation and perturbation of integrin signaling suppressed Tim-4-promoted efferocytosis. Taken together, the data suggest that Fn1 locates Tim-4 and integrins in close proximity by acting as a scaffold, resulting in synergistic cooperation of Tim-4 with integrins for efficient efferocytosis.
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Affiliation(s)
- Juyeon Lee
- School of Life Sciences and Aging Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea.,Research Center for Cellular Homeostasis, Ewha Womans University, Seoul, 03760, Korea
| | - Boyeon Park
- School of Life Sciences and Aging Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea.,Microbiology and Functionality Research Group, World Institute of Kimchi, Gwangju, 61755, Korea
| | - Byeongjin Moon
- School of Life Sciences and Aging Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea
| | - Jeongjun Park
- School of Life Sciences and Aging Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea
| | - Hyunji Moon
- School of Life Sciences and Aging Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea.,Research Center for Cellular Homeostasis, Ewha Womans University, Seoul, 03760, Korea
| | - Kwanhyeong Kim
- School of Life Sciences and Aging Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea.,Research Center for Cellular Homeostasis, Ewha Womans University, Seoul, 03760, Korea
| | - Sang-Ah Lee
- School of Life Sciences and Aging Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea
| | - Deokhwan Kim
- School of Life Sciences and Aging Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea.,Research Center for Cellular Homeostasis, Ewha Womans University, Seoul, 03760, Korea
| | - Chanhyuk Min
- School of Life Sciences and Aging Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea
| | - Dae-Hee Lee
- Department of Oncology, College of Medicine, Korea University, Seoul, 08308, Korea
| | - Gwangrog Lee
- School of Life Sciences and Aging Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea
| | - Daeho Park
- School of Life Sciences and Aging Research Institute, Gwangju Institute of Science and Technology, Gwangju, 61005, Korea. .,Research Center for Cellular Homeostasis, Ewha Womans University, Seoul, 03760, Korea.
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7
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Barth ND, Marwick JA, Vendrell M, Rossi AG, Dransfield I. The "Phagocytic Synapse" and Clearance of Apoptotic Cells. Front Immunol 2017; 8:1708. [PMID: 29255465 PMCID: PMC5723006 DOI: 10.3389/fimmu.2017.01708] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Accepted: 11/20/2017] [Indexed: 12/17/2022] Open
Abstract
Apoptosis and subsequent phagocytic clearance of apoptotic cells is important for embryonic development, maintenance of tissues that require regular cellular renewal and innate immunity. The timely removal of apoptotic cells prevents progression to secondary necrosis and release of cellular contents, preventing cellular stress and inflammation. In addition, altered phagocyte behavior following apoptotic cell contact and phagocytosis engages an anti-inflammatory phenotype, which impacts upon development and progression of inflammatory and immune responses. Defective apoptotic cell clearance underlies the development of various inflammatory and autoimmune diseases. There is considerable functional redundancy in the receptors that mediate apoptotic cell clearance, highlighting the importance of this process in diverse physiological processes. A single phagocyte may utilize multiple receptor pathways for the efficient capture of apoptotic cells by phagocytes (tethering) and the subsequent initiation of signaling events necessary for internalization. In this review, we will consider the surface alterations and molecular opsonization events associated with apoptosis that may represent a tunable signal that confers distinct intracellular signaling events and hence specific phagocyte responses in a context-dependent manner. Efficient molecular communication between phagocytes and apoptotic targets may require cooperative receptor utilization and the establishment of efferocytic synapse, which acts to stabilize adhesive interactions and facilitate the organization of signaling platforms that are necessary for controlling phagocyte responses.
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Affiliation(s)
- Nicole D Barth
- MRC Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - John A Marwick
- MRC Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Marc Vendrell
- MRC Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Adriano G Rossi
- MRC Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Ian Dransfield
- MRC Centre for Inflammation Research, Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
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8
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Streptococcus pneumoniae disrupts pulmonary immune defence via elastase release following pneumolysin-dependent neutrophil lysis. Sci Rep 2016; 6:38013. [PMID: 27892542 PMCID: PMC5125098 DOI: 10.1038/srep38013] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Accepted: 11/04/2016] [Indexed: 11/08/2022] Open
Abstract
Streptococcus pneumoniae is a leading cause of bacterial pneumonia and is the principal cause of morbidity and mortality worldwide. Previous studies suggested that excessive activation of neutrophils results in the release of neutrophil elastase, which contributes to lung injury in severe pneumonia. Although both pneumococcal virulence factors and neutrophil elastase contribute to the development and progression of pneumonia, there are no studies analysing relationships between these factors. Here, we showed that pneumolysin, a pneumococcal pore-forming toxin, induced cell lysis in primary isolated human neutrophils, leading to the release of neutrophil elastase. Pneumolysin exerted minimal cytotoxicity against alveolar epithelial cells and macrophages, whereas neutrophil elastase induced detachment of alveolar epithelial cells and impaired phagocytic activity in macrophages. Additionally, activation of neutrophil elastase did not exert bactericidal activity against S. pneumoniae in vitro. P2X7 receptor, which belongs to a family of purinergic receptors, was involved in pneumolysin-induced cell lysis. These findings suggested that infiltrated neutrophils are the primary target cells of pneumolysin, and that S. pneumoniae exploits neutrophil-elastase leakage to induce the disruption of pulmonary immune defences, thereby causing lung injury.
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9
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Streptococcal pyrogenic exotoxin B inhibits apoptotic cell clearance by macrophages through protein S cleavage. Sci Rep 2016; 6:26026. [PMID: 27181595 PMCID: PMC4867609 DOI: 10.1038/srep26026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 04/25/2016] [Indexed: 11/08/2022] Open
Abstract
Clearance of apoptotic cells by macrophages plays an important role in maintaining tissue homeostasis. Previous study indicated that streptococcal pyrogenic exotoxin B (SPE B) reduces phagocytic activity in group A streptococcus (GAS) infection. Here, we demonstrate that SPE B causes an inhibitory effect on protein S-mediated phagocytosis. In the presence of SPE B, serum- and purified protein S-mediated phagocytosis of apoptotic cells were significantly inhibited. The binding abilities of protein S to apoptotic cells were decreased by treatment with SPE B. Bacterial culture supernatants from GAS NZ131 strain also caused a reduction of protein S binding to apoptotic cells, but speB mutant strain did not. SPE B directly cleaved protein S in vitro and in vivo, whereas a lower level of cleavage occurred in mice infected with a speB isogenic mutant strain. SPE B-mediated initial cleavage of protein S caused a disruption of phagocytosis, and also resulted in a loss of binding ability of protein S-associated C4b-binding protein to apoptotic cells. Taken together, these results suggest a novel pathogenic role of SPE B that initiates protein S degradation followed by the inhibition of apoptotic cell clearance by macrophages.
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10
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Tissue biology perspective on macrophages. Nat Immunol 2016; 17:9-17. [PMID: 26681457 DOI: 10.1038/ni.3320] [Citation(s) in RCA: 442] [Impact Index Per Article: 55.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Accepted: 10/09/2015] [Indexed: 12/11/2022]
Abstract
Macrophages are essential components of mammalian tissues. Although historically known mainly for their function in host defense and the clearance of apoptotic cells, macrophages are now increasingly recognized as serving many roles in tissue development, homeostasis and repair. In addition, tissue-resident macrophages have many tissue-specific functional characteristics, which are a reflection of distinct gene-expression programs. Here we discuss the emerging views of macrophage biology from evolutionary, developmental and homeostatic perspectives.
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11
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Affiliation(s)
- Madhur P Motwani
- Centre for Clinical Pharmacology and Therapeutics, Division of Medicine, 5 University Street, University College London, London WC1E 6JJ, United Kingdom
| | - Derek W Gilroy
- Centre for Clinical Pharmacology and Therapeutics, Division of Medicine, 5 University Street, University College London, London WC1E 6JJ, United Kingdom.
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12
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Gilroy D, De Maeyer R. New insights into the resolution of inflammation. Semin Immunol 2015; 27:161-8. [PMID: 26037968 DOI: 10.1016/j.smim.2015.05.003] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 05/06/2015] [Accepted: 05/13/2015] [Indexed: 12/31/2022]
Abstract
The goal of treating chronic inflammatory diseases must be to inhibit persistent inflammation and restore tissue function. To achieve this we need to improve our understanding of the pathways that drive inflammation as well as those that bring about its resolution. In particular, resolution of inflammation is driven by a complex set of mediators that regulate cellular events required to clear inflammatory cells from sites of injury or infection and restore homeostasis. Indeed, it may be argued that dysfunctional resolution may underpin the aetiology of some chronic inflammatory disease and that a novel goal in treating such diseases is to develop drugs based on the mode of endogenous pro-resolution factors in order to drive on-going inflammation down a pro-resolution pathway. And while we are improving our understanding of the resolution of acute and chronic inflammation, much remains to be discovered. Here we will discuss the key endogenous checkpoints necessary for mounting an effective yet limited inflammatory response and the crucial biochemical pathways necessary to prevent its persistence and trigger its resolution. In doing so, we will provide an update on what is known about resolution of acute inflammation, in particular its link with adaptive immunity.
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Affiliation(s)
- Derek Gilroy
- Centre for Clinical Pharmacology and Therapeutics, Division of Medicine, 5 University Street, University College London, London WC1E 6JJ, United Kingdom.
| | - Roel De Maeyer
- Centre for Clinical Pharmacology and Therapeutics, Division of Medicine, 5 University Street, University College London, London WC1E 6JJ, United Kingdom
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13
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Svensson-Arvelund J, Ernerudh J. The Role of Macrophages in Promoting and Maintaining Homeostasis at the Fetal-Maternal Interface. Am J Reprod Immunol 2015; 74:100-9. [DOI: 10.1111/aji.12357] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Accepted: 02/24/2014] [Indexed: 12/25/2022] Open
Affiliation(s)
- Judit Svensson-Arvelund
- Clinical Immunology; Department of Clinical and Experimental Medicine; Faculty of Health Sciences; Linköping University; Linköping Sweden
| | - Jan Ernerudh
- Clinical Immunology; Department of Clinical and Experimental Medicine; Faculty of Health Sciences; Linköping University; Linköping Sweden
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14
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Ghosh S, Hoselton SA, Dorsam GP, Schuh JM. Hyaluronan fragments as mediators of inflammation in allergic pulmonary disease. Immunobiology 2014; 220:575-88. [PMID: 25582403 DOI: 10.1016/j.imbio.2014.12.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Revised: 12/10/2014] [Accepted: 12/15/2014] [Indexed: 12/22/2022]
Abstract
Asthma is frequently caused and/or exacerbated by sensitization to allergens, which are ubiquitous in many indoor and outdoor environments. Severe asthma is characterized by airway hyperresponsiveness and bronchial constriction in response to an inhaled allergen, leading to a disease course that is often very difficult to treat with standard asthma therapies. As a result of interactions among inflammatory cells, structural cells, and the intercellular matrix of the allergic lung, patients with sensitization to allergens may experience a greater degree of tissue injury followed by airway wall remodeling and progressive, accumulated pulmonary dysfunction as part of the disease sequela. In addition, turnover of extracellular matrix (ECM) components is a hallmark of tissue injury and repair. This review focuses on the role of the glycosaminoglycan hyaluronan (HA), a component of the ECM, in pulmonary injury and repair with an emphasis on allergic asthma. Both the synthesis and degradation of the ECM are critical contributors to tissue repair and remodeling. Fragmented HA accumulates during tissue injury and functions in ways distinct from the larger native polymer. There is gathering evidence that HA degradation products are active participants in stimulating the expression of inflammatory genes in a variety of immune cells at the injury site. In this review, we will consider recent advances in the understanding of the mechanisms that are associated with HA accumulation and inflammatory cell recruitment in the asthmatic lung.
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Affiliation(s)
- Sumit Ghosh
- Department of Veterinary and Microbiological Sciences, North Dakota State University, Fargo, ND 58108, USA.
| | - Scott A Hoselton
- Department of Veterinary and Microbiological Sciences, North Dakota State University, Fargo, ND 58108, USA
| | - Glenn P Dorsam
- Department of Veterinary and Microbiological Sciences, North Dakota State University, Fargo, ND 58108, USA
| | - Jane M Schuh
- Department of Veterinary and Microbiological Sciences, North Dakota State University, Fargo, ND 58108, USA
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15
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Particle size influences fibronectin internalization and degradation by fibroblasts. Exp Cell Res 2014; 328:172-185. [PMID: 24995996 DOI: 10.1016/j.yexcr.2014.06.018] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Revised: 06/20/2014] [Accepted: 06/22/2014] [Indexed: 11/20/2022]
Abstract
The application of nanotechnology for drug targeting underlines the importance of controlling the kinetics and cellular sites of delivery for optimal therapeutic outcomes. Here we examined the effect of particle size on internalization and degradation of surface-bound fibronectin by fibroblasts using polystyrene nanoparticles (NPs; 51 nm) and microparticles (MPs; 1 μm). Fibronectin was strongly bound by NPs and MPs as assessed by immuno-dot blot analysis (5.1 ± 0.4 × 10(- 5)pg fibronectin per μm(2) of NP surface; 4.2 ± ± 0.3 × 10(-5)pg fibronectin per μm(2) of MP surface; p>0.2). We estimated that ~193 fibronectin molecules bound to a MP compared with 0.6 fibronectin molecules per NP, indicating that ~40% of nanoparticles were not bound by fibronectin. One hour after incubation, fibronectin-coated NPs and MPs were rapidly internalized by Rat-2 fibroblasts. MPs and NPs were engulfed partly by receptor-mediated endocytosis as indicated by decreased uptake when incubated at 4°C, or by depletion of ATP with sodium azide. Pulse-chase experiments showed minimal exocytosis of NPs and MPs. Internalization of NPs and MPs was inhibited by jasplakinolide, whereas internalization of MPs but not NPs was inhibited by latrunculin B and by integrin-blocking antibodies. Extraction of plasma membrane cholesterol with methyl β-cyclodextrin inhibited internalization of fibronectin-coated NPs but not MPs. Biotinylated fibronectin internalized by cells was extensively degraded on MPs but not NPs. Particle size affects actin and clathrin-dependent internalization mechanisms leading to fibronectin degradation on MPs but not NPs. Thus either prolonged, controlled release or an immediate delivery of drugs can be achieved by adjusting the particle size along with matrix proteins such as FN.
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16
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Zhang G, Wang Y. Genotoxic effects of diethyl phthalate on the non-specific immune function of carp. TOXIN REV 2014. [DOI: 10.3109/15569543.2014.905793] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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17
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Grossmayer GE, Munoz LE, Gaipl US, Franz S, Sheriff A, Voll RE, Kalden JR, Herrmann M. Removal of dying cells and systemic lupus erythematosus. Mod Rheumatol 2014. [DOI: 10.3109/s10165-005-0430-x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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18
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Feghali K, Grenier D. Priming effect of fibronectin fragments on the macrophage inflammatory response: potential contribution to periodontitis. Inflammation 2013; 35:1696-705. [PMID: 22696147 DOI: 10.1007/s10753-012-9487-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Fibronectin, an extracellular matrix component, is a substrate for multiple host and bacterial proteinases found in inflamed periodontal sites. In the present study, we investigated the potential contribution of various fibronectin fragments to the inflammatory process of periodontitis. Our results showed that the smaller fragments of fibronectin (30 and 45 kDa) were the most potent inflammatory inducers as they dose-dependently increased the secretion of TNF-α, IL-1β, and IL-8 by human macrophages. The 120-kDa fragment did not induce the secretion of all the cytokines tested, while intact fibronectin only increased IL-8 secretion and to a lesser extent TNF-α secretion. Cytokine secretion was associated with increased amounts of phosphorylated ERK1/2, JNK2, and p38α MAPK in treated macrophages. The combination of fibronectin or fibronectin fragments with Porphyromonas gingivalis lipopolysaccharide had an additive effect, but no synergism appeared to occur. It was also demonstrated that gingival crevicular fluid samples recovered from patients with moderate to severe periodontitis contained more fibronectin fragments than samples obtained from healthy subjects. Finally, both Arg- and Lys-gingipains purified from P. gingivalis were found to modulate fibronectin fragmentation. In conclusion, we showed that specific fibronectin fragments that may be present in diseased periodontal sites may contribute to maintaining and amplifying the inflammatory state and that P. gingivalis gingipains may be involved in the production of these fragments.
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Affiliation(s)
- Karine Feghali
- Groupe de Recherche en Écologie Buccale, Faculté de Médecine Dentaire, Université Laval, 2420 Rue de la Terrasse, Quebec City, QC, Canada, G1V 0A6
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19
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Physical break-down of the classical view on cancer cell invasion and metastasis. Eur J Cell Biol 2013; 92:89-104. [PMID: 23391781 DOI: 10.1016/j.ejcb.2012.12.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 12/12/2012] [Accepted: 12/23/2012] [Indexed: 11/23/2022] Open
Abstract
Eight classical hallmarks of cancer have been proposed and are well-defined by using biochemical or molecular genetic methods, but are not yet precisely defined by cellular biophysical processes. To define the malignant transformation of neoplasms and finally reveal the functional pathway, which enables cancer cells to promote cancer progression, these classical hallmarks of cancer require the inclusion of specific biomechanical properties of cancer cells and their microenvironment such as the extracellular matrix and embedded cells such as fibroblasts, macrophages or endothelial cells. Nonetheless a main novel ninth hallmark of cancer is still elusive in classical tumor biological reviews, which is the aspect of physics in cancer disease by the natural selection of an aggressive (highly invasive) subtype of cancer cells. The physical aspects can be analyzed by using state-of-the-art biophysical methods. Thus, this review will present current cancer research in a different light and will focus on novel physical methods to investigate the aggressiveness of cancer cells from a biophysicist's point of view. This may lead to novel insights into cancer disease and will overcome classical views on cancer. In addition, this review will discuss how physics of cancer can help to reveal whether cancer cells will invade connective tissue and metastasize. In particular, this review will point out how physics can improve, break-down or support classical approaches to examine tumor growth even across primary tumor boundaries, the invasion of single or collective cancer cells, transendothelial migration of cancer cells and metastasis in targeted organs. Finally, this review will show how physical measurements can be integrated into classical tumor biological analysis approaches. The insights into physical interactions between cancer cells, the primary tumor and the microenvironment may help to solve some "old" questions in cancer disease progression and may finally lead to novel approaches for development and improvement of cancer diagnostics and therapies.
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20
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Stepanek O, Brdicka T, Angelisova P, Horvath O, Spicka J, Stockbauer P, Man P, Horejsi V. Interaction of late apoptotic and necrotic cells with vitronectin. PLoS One 2011; 6:e19243. [PMID: 21573223 PMCID: PMC3087723 DOI: 10.1371/journal.pone.0019243] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2010] [Accepted: 03/30/2011] [Indexed: 11/25/2022] Open
Abstract
Background Vitronectin is an abundant plasma glycoprotein identified also as a part of extracellular matrix. Vitronectin is substantially enriched at sites of injured, fibrosing, inflamed, and tumor tissues where it is believed to be involved in wound healing and tissue remodeling. Little is known about the mechanism of vitronectin localization into the damaged tissues. Methodology/Principal Findings 2E12 antibody has been described to bind a subset of late apoptotic cells. Using immunoisolation followed by mass spectrometry, we identified the antigen recognized by 2E12 antibody as vitronectin. Based on flow cytometry, we described that vitronectin binds to the late apoptotic and necrotic cells in cell cultures in vitro as well as in murine thymus and spleen in vivo. Confocal microscopy revealed that vitronectin binds to an intracellular cytoplasmic structure after the membrane rupture. Conclusions/Significance We propose that vitronectin could serve as a marker of membrane disruption in necrosis and apoptosis for flow cytometry analysis. Moreover, we suggest that vitronectin binding to dead cells may represent one of the mechanisms of vitronectin incorporation into the injured tissues.
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Affiliation(s)
- Ondrej Stepanek
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
| | - Tomas Brdicka
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
| | - Pavla Angelisova
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
| | - Ondrej Horvath
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
| | - Jiri Spicka
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
| | - Petr Stockbauer
- Institute of Hematology and Blood Transfusion, Prague, Czech Republic
| | - Petr Man
- Institute of Microbiology, Academy of Sciences of the Czech Republic, Praha, Czech Republic
| | - Vaclav Horejsi
- Institute of Molecular Genetics, Academy of Sciences of the Czech Republic, Praha, Czech Republic
- * E-mail:
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21
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Michlewska S, McColl A, Rossi AG, Megson IL, Dransfield I. Clearance of dying cells and autoimmunity. Autoimmunity 2009; 40:267-73. [PMID: 17516208 DOI: 10.1080/08916930701357208] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Phagocytic clearance of apoptotic cells is an important physiologic homeostatic mechanism that is associated with non-inflammatory or anti-inflammatory sequalae. Disruption of the process of apoptotic cell clearance may contribute to development of a number of inflammatory and autoimmune diseases. In this review, we summarize the molecular pathways that have been suggested to account for phagocytic clearance of apoptotic cells. We discuss potential mechanisms for regulation of phagocytosis and the implications for development of autoimmunity.
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Affiliation(s)
- Sylwia Michlewska
- The Queen's Medical Research Institute, MRC Centre for Inflammation Research, University of Edinburgh Medical School, Edinburgh, Scotland, UK.
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22
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Hart SP, Dransfield I, Rossi AG. Phagocytosis of apoptotic cells. Methods 2008; 44:280-5. [PMID: 18314060 DOI: 10.1016/j.ymeth.2007.11.009] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2007] [Accepted: 11/10/2007] [Indexed: 01/04/2023] Open
Abstract
Removal of apoptotic cells by phagocytes plays an important role in many biological processes, including embryological development and tissue remodelling. In addition, it has become apparent that one of the key mechanisms for the successful resolution of inflammation is the orchestrated clearance of apoptotic inflammatory cells by phagocytes (e.g., macrophages and dendritic cells) and other cells known to have phagocytic capacity (e.g., hepatocytes, endothelial cells, epithelial cells, etc.). Furthermore, phagocytosis of apoptotic cells is an active and highly regulated process that not only serves to remove potentially histotoxic cells from the inflammatory milieu, but also directs the phenotype of the phagocytic cell to be anti-inflammatory. Convincing evidence has been presented that reduced or dysregulated phagocytosis of apoptotic cells contributes to the development and propagation of inflammatory disorders. Conversely, enhanced phagocytosis of apoptotic cells may be exploited for therapeutic gain. Indeed, powerful anti-inflammatory drugs such as the glucocorticoids have been shown to augment clearance of apoptotic cells which may contribute to their therapeutic effectiveness. In this chapter, we describe methods for studying phagocytosis of apoptotic cells.
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Affiliation(s)
- Simon P Hart
- MRC Centre for Inflammation Research, University of Edinburgh, Queen's Medical Research Institute, 47 Little France Crescent, Edinburgh EH16 4TJ, UK
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23
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Kirkham P. Oxidative stress and macrophage function: a failure to resolve the inflammatory response. Biochem Soc Trans 2007; 35:284-7. [PMID: 17371261 DOI: 10.1042/bst0350284] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The suppression of pro-inflammatory gene expression along with the clearance of apoptotic cells by phagocytosis can play an important role in resolving the inflammatory response. Any impairment of these processes can therefore lead to a chronic inflammatory state. Oxidative stress can have both direct and indirect effects on macrophage function. This mini-review highlights a mechanism through which oxidative stress via the production of reactive carbonyls alters the ECM (extracellular matrix) environment of macrophages, thereby altering their behaviour. Carbonyl modification of ECM proteins causes increased macrophage adhesion and activation through receptors that are also involved in phagocytosis. Moreover, interaction of macrophages with these carbonyl-modified ECM proteins leads to decreased phagocytic activity towards apoptotic cells. At a more direct level, both oxidative and carbonyl stress inhibits activity of the transcriptional co-repressor HDAC-2 (histone deacetylase 2), which under normoxic conditions helps to suppress pro-inflammatory gene expression. Consequently, macrophages activated under conditions of oxidative or carbonyl stress can lead to a more enhanced inflammatory response. Coupled with an impairment of the phagocytic response, this can lead to ineffective clearance of apoptotic cells and secondary necrosis, with the result being failure to resolve the inflammatory response and the establishment of a chronic inflammatory state.
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Affiliation(s)
- P Kirkham
- Novartis Institutes for Biomedical Research, Wimblehurst Road, Horsham, West Sussex, UK.
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24
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Grossmayer GE, Munoz LE, Gaipl US, Franz S, Sheriff A, Voll RE, Kalden JR, Herrmann M. Removal of dying cells and systemic lupus erythematosus. Mod Rheumatol 2007; 15:383-90. [PMID: 17029100 DOI: 10.1007/s10165-005-0430-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2005] [Accepted: 08/23/2005] [Indexed: 10/25/2022]
Abstract
Systemic lupus erythematosus (SLE) is a very heterogeneous systemic autoimmune disease, in which autoantibody synthesis against nuclear constituents is the main immunological characteristic. These autoantibodies underwent affinity maturation and isotype switching. Additionally, T-cell tolerance against nuclear autoantigens should be affected in these autoimmune patients. Nuclear material derived from apoptotic and/or necrotic cells may serve as an important source of autoantigens. However, dead and dying cells as well as cellular debris are rapidly removed from tissues by phagocytes without eliciting inflammation or immune responses under healthy conditions. During apoptosis nuclear components are strongly modified through enzymatic reactions. If these cells are not timely cleared, those autoantigens may be released, taken up, and presented by dendritic cells in tissues or presented by follicular dendritic cells in lymph nodes to T and B cells, respectively. This could be a mechanism for breaking the peripheral self-tolerance. In this article we focus on the deficient clearance of apoptotic cells in SLE patients and its importance in development of this autoimmune disease.
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Affiliation(s)
- Gerhard E Grossmayer
- Institute for Clinical Immunology, Department of Medicine 3, Friedrich-Alexander University of Erlangen-Nuremberg, Glückstrasse 4a, 91054, Erlangen, Germany
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25
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Seitz HM, Camenisch TD, Lemke G, Earp HS, Matsushima GK. Macrophages and dendritic cells use different Axl/Mertk/Tyro3 receptors in clearance of apoptotic cells. THE JOURNAL OF IMMUNOLOGY 2007; 178:5635-42. [PMID: 17442946 DOI: 10.4049/jimmunol.178.9.5635] [Citation(s) in RCA: 293] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The clearance of apoptotic cells is important for regulating tissue homeostasis, inflammation, and autoimmune responses. The absence of receptor tyrosine kinases (Axl, Mertk, and Tyro3) results in widespread accumulation of apoptotic cells and autoantibody production in mice. In this report, we examine the function of the three family members in apoptotic cell clearance by different phagocytic cell types. Mertk elimination nearly abolished macrophage apoptotic cell phagocytosis; elimination of Axl, Tyro3, or both, reduced macrophage phagocytosis by approximately half, indicating that these also play a role. In contrast, apoptotic cell clearance in splenic and bone marrow-derived dendritic cells (DCs) is prolonged compared with macrophages and relied primarily on Axl and Tyro3. The slower ingestion may be due to lower DC expression of Axl and Tyro3 or absence of GAS6 expression, a known ligand for this receptor family. In vivo, phagocytosis of apoptotic material by retinal epithelial cells required Mertk. Unlike macrophages, there did not appear to be any role for Axl or Tyro3 in retinal homeostasis. Likewise, clearance of apoptotic thymocytes in vivo was dramatically reduced in mertk(kd) mice, but was normal in axl/tyro3(-/-) mice. Thus, cell and organ type specificity is clearly delineated, with DCs relying on Axl and Tyro3, retina and thymus requiring Mertk, and macrophages exhibiting an interaction that involves all three family members. Surprisingly, in macrophages, tyrosine phosphorylation of Mertk in response to apoptotic cells is markedly diminished from axl/tyro3(-/-) mice, suggesting that the interactions of these receptors by heterodimerization may be important in some cells.
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Affiliation(s)
- Heather M Seitz
- Department of Microbiology and Immunology, University of North Carolina-Chapel Hill, Chapel Hill, NC 27599, USA
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26
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Abstract
Inflammation has evolved as a protective response to insult or injury, it's a primordial response that eliminates or neutralises foreign organisms or material, the resolution of inflammation encompasses the endogenous anti-inflammatory mechanisms that protect us against excessive tissue injury and promote the restoration of tissue structure and function. In fact, our well being and survival depends upon its efficiency and carefully-balanced control. In general, the innate inflammatory response initiates within minutes and, if all is well, resolves within hours. In contrast, chronic inflammation persists for weeks, months or even years. Here, we are going to discuss the key endogenous checkpoints necessary for mounting an effective yet limited inflammatory response and the crucial biochemical pathways necessary to prevent its persistence.
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Affiliation(s)
- Toby Lawrence
- Kennedy Institute of Rheumatology Division, Imperial College, London, UK.
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27
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Geraghty P, Rogan MP, Greene CM, Boxio RMM, Poiriert T, O'Mahony M, Belaaouaj A, O'Neill SJ, Taggart CC, McElvaney NG. Neutrophil Elastase Up-Regulates Cathepsin B and Matrix Metalloprotease-2 Expression. THE JOURNAL OF IMMUNOLOGY 2007; 178:5871-8. [PMID: 17442971 DOI: 10.4049/jimmunol.178.9.5871] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Neutrophil elastase (NE) activity is increased in many diseases. Other families of proteases, including cathepsins and matrix metalloproteases (MMPs), are also present at elevated levels in similar disease conditions. We postulated that NE could induce expression of cathepsins and MMPs in human macrophages. NE exposure resulted in macrophages, producing significantly greater amounts of cathepsin B and latent and active MMP-2. Cathepsin B and MMP-2 activities were decreased in Pseudomonas-infected NE knockout mice compared with wild-type littermates. We also demonstrate that NE can activate NF-kappaB in macrophages, and inhibition of NF-kappaB resulted in a reduction of NE-induced cathepsin B and MMP-2. Also, inhibition of TLR-4 or transfection of macrophages with dominant-negative IL-1R-associated kinase-1 resulted in a reduction of NE-induced cathepsin B and MMP-2. This study describes for the first time a novel hierarchy among proteases whereby a serine protease up-regulates expression of MMPs and cathepsins. This has important implications for therapeutic intervention in protease-mediated diseases.
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Affiliation(s)
- Patrick Geraghty
- Pulmonary Research Division, Royal College of Surgeons in Ireland, Beaumont Hospital, Dublin, Ireland
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28
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Abstract
Neutrophil-derived granule enzymes, oxidants, and mediators have been implicated in the pathogenesis of a variety of inflammatory diseases. Neutrophil apoptosis is associated with the loss of expression of adhesion molecules and greatly reduced responsiveness to external stimuli, so that these cells become functionally isolated from their environment. In contrast with necrosis, apoptosis is associated with preservation of plasma membrane integrity, so that release of harmful neutrophil contents is limited, and the inert neutrophils are phagocytosed by local macrophages. Furthermore, phagocytosis of apoptotic neutrophils by human macrophages in vitro suppresses release of macrophage-derived pro-inflammatory mediators. In this way, by downregulating neutrophil functions and triggering "silent" clearance by phagocytes, apoptosis provides a mechanism for the safe disposal of potentially destructive inflammatory cells. Many of the molecular events involved in the apoptosis pathway have been identified and several complementary methods may be employed to identify and quantitate neutrophil apoptosis. This chapter will discuss analysis of neutrophil morphology, DNA fragmentation, membrane changes, mitochondrial alterations, caspase activation, and phagocytosis of apoptotic neutrophils by macrophages.
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Affiliation(s)
- Emma L Taylor
- MRC/University of Edinburgh Centre for Inflammation Research, Queen's Medical Research Institute, Edinburgh, United Kingdom
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29
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Halter M, Antia M, Vogel V. Fibronectin conformational changes induced by adsorption to liposomes. J Control Release 2005; 101:209-22. [PMID: 15588906 DOI: 10.1016/j.jconrel.2004.07.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2004] [Accepted: 07/01/2004] [Indexed: 11/25/2022]
Abstract
One of the major drawbacks of drug delivery techniques that utilize liposomes as carriers is that they are often cleared from the body before they can deliver their therapeutic cargo. It is well known that serum proteins can adsorb to these drug delivery vehicles and influence their uptake by phagocytic cells. For this reason, protein adsorption to liposomes has been extensively quantified, and strategies have been developed to minimize protein adsorption to improve drug delivery. However, the conformation of proteins on surfaces can play an even greater role in controlling cell behavior than the quantity of adsorbed protein. We have therefore used fluorescence resonance energy transfer (FRET) to measure changes in the structure of fibronectin (Fn)--a key serum protein involved in phagocytosis--upon interaction with phosphatidylcholine (PC) liposomes. Our experiments reveal that fibronectin opens up from its inactive, compact conformation upon interaction with gel phase PC liposomes. We also used FRET to estimate a physiologically relevant dissociation constant, KD=1.1 nM, for the interaction. Conformational changes in serum proteins may result in the exposure of otherwise concealed recognition sites and therefore influence the interaction of liposomes with phagocytic cells.
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Affiliation(s)
- Michael Halter
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
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30
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31
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de Almeida CJG, Chiarini LB, da Silva JP, E Silva PMR, Martins MA, Linden R. The cellular prion protein modulates phagocytosis and inflammatory response. J Leukoc Biol 2004; 77:238-46. [PMID: 15539455 DOI: 10.1189/jlb.1103531] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
The cellular prion protein (PrPc) is a glycoprotein anchored by glycosylphosphatidylinositol (GPI) to the cell surface and is abundantly expressed in the central nervous system. It is also expressed in a variety of cell types of the immune system. We investigated the role of PrPc in the phagocytosis of apoptotic cells and other particles. Macrophages from mice with deletion of the Prnp gene showed higher rates of phagocytosis than wild-type macrophages in in vitro assays. The elimination of GPI-anchored proteins from the cell surface of macrophages from wild-type mice rendered these cells as efficient as macrophages derived from knockout mice. In situ detection of phagocytosis of apoptotic bodies within the retina indicated augmented phagocytotic activity in knockout mice. In an in vivo assay of acute peritonitis, knockout mice showed more efficient phagocytosis of zymosan particles than wild-type mice. In addition, leukocyte recruitment was altered in knockout mice, as compared with wild type. The data show that PrPc modulates phagocytosis in vitro and in vivo. This activity is described for the first time and may be important for normal macrophage functions as well as for the pathogenesis of prion diseases.
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32
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Henriksen PA, Devitt A, Kotelevtsev Y, Sallenave JM. Gene delivery of the elastase inhibitor elafin protects macrophages from neutrophil elastase-mediated impairment of apoptotic cell recognition. FEBS Lett 2004; 574:80-4. [PMID: 15358543 DOI: 10.1016/j.febslet.2004.08.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2004] [Accepted: 08/02/2004] [Indexed: 11/20/2022]
Abstract
The resolution of inflammation is dependent on recognition and phagocytic removal of apoptotic cells by macrophages. Receptors for apoptotic cells are sensitive to degradation by human neutrophil elastase (HNE). We show in the present study that HNE cleaves macrophage cell surface CD14 and in so doing, reduces phagocytic recognition of apoptotic lymphocytic cells (Mutu 1). Using an improved method of adenovirus-mediated transfection of macrophages with the HNE inhibitor elafin, we demonstrate that elafin overexpression prevents CD14 cleavage and restores apoptotic cell recognition by macrophages. This approach of genetic modification of macrophages could be used to restore apoptotic cell recognition in inflammatory conditions.
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Affiliation(s)
- Peter A Henriksen
- Rayne Laboratory, MRC Centre for Inflammation Research, Edinburgh University Medical School, Teviot Place, Edinburgh EH8 9AG, UK
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33
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Henriksen PA, Hitt M, Xing Z, Wang J, Haslett C, Riemersma RA, Webb DJ, Kotelevtsev YV, Sallenave JM. Adenoviral gene delivery of elafin and secretory leukocyte protease inhibitor attenuates NF-kappa B-dependent inflammatory responses of human endothelial cells and macrophages to atherogenic stimuli. THE JOURNAL OF IMMUNOLOGY 2004; 172:4535-44. [PMID: 15034071 DOI: 10.4049/jimmunol.172.7.4535] [Citation(s) in RCA: 116] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Atherosclerosis is a chronic inflammatory disease affecting arterial vessels. Strategies to reduce the inflammatory responses of endothelial cells and macrophages may slow lesion development and prevent complications such as plaque rupture. The human protease human neutrophil elastase (HNE), oxidized low density lipoprotein, LPS, and TNF-alpha were chosen as model stimuli of arterial wall inflammation and led to production of the chemokine IL-8 in endothelial cells. To counteract the activity of HNE, we have examined the effects of adenoviral gene delivery of the anti-elastases elafin, previously demonstrated within human atheroma, and murine secretory leukocyte protease inhibitor (SLPI), a related molecule, on the inflammatory responses of human endothelial cells and macrophages to atherogenic stimuli. We developed a technique of precomplexing adenovirus with cationic lipid to augment adenoviral infection efficiency in endothelial cells and to facilitate infection in macrophages. Elafin overexpression protected endothelial cells from HNE-induced IL-8 production and cytotoxicity. Elafin and murine SLPI also reduced endothelial IL-8 release in response to oxidized low density lipoprotein, LPS, and TNF-alpha and macrophage TNF-alpha production in response to LPS. This effect was associated with reduced activation of the inflammatory transcription factor NF-kappaB, through up-regulation of IkappaBalpha, in both cell types. Our work suggests a novel and extended anti-inflammatory role for these HNE inhibitors working as effectors of innate immunity to protect tissues against maladaptive inflammatory responses. Our findings indicate that elafin and SLPI may be gene therapy targets for the treatment of atheroma.
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Affiliation(s)
- Peter A Henriksen
- Rayne Laboratory, Medical Research Council Centre for Inflammation Research, Medical School, University of Edinburgh, Edinburgh, United Kingdom
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34
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Kirkham PA, Spooner G, Rahman I, Rossi AG. Macrophage phagocytosis of apoptotic neutrophils is compromised by matrix proteins modified by cigarette smoke and lipid peroxidation products. Biochem Biophys Res Commun 2004; 318:32-7. [PMID: 15110749 DOI: 10.1016/j.bbrc.2004.04.003] [Citation(s) in RCA: 111] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2004] [Indexed: 11/18/2022]
Abstract
Clearance of apoptotic cells by phagocytosis plays an important role in the resolution of an inflammatory response. Macrophages interacting with extracellular matrix (ECM) proteins upregulate their phagocytic capacity. Cigarette smoke contains highly reactive carbonyls that modify proteins which directly/indirectly affects cellular function. We observed, in vitro, that human macrophages interacting with carbonyl or cigarette smoke modified ECM proteins dramatically down regulated their ability to phagocytose apoptotic neutrophils. We also show that this interaction with carbonyl-adduct modified ECM proteins led to increased macrophage adhesion in vitro. We hypothesise that changes in the ECM environment as a result of cigarette smoking affect the ability of macrophages to remove apoptotic cells. Moreover, we postulate that this decreased phagocytic activity was as a result of sequestration of receptors involved in the uptake of apoptotic cells towards that of recognition of carbonyl adducts on the modified ECM proteins leading to increased macrophage adhesion.
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Affiliation(s)
- Paul A Kirkham
- Novartis Institute for Biomedical Research (Horsham), West Sussex, UK.
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35
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Gilroy DW, Lawrence T, Perretti M, Rossi AG. Inflammatory Resolution: new opportunities for drug discovery. Nat Rev Drug Discov 2004; 3:401-16. [PMID: 15136788 DOI: 10.1038/nrd1383] [Citation(s) in RCA: 555] [Impact Index Per Article: 27.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Derek W Gilroy
- William Harvey Research Institute, St. Bartholomew's and the Royal London School of Medicine and Dentistry, Charterhouse Square, London EC1M 6BQ, UK.
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36
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Ballarin L, Scanferla M, Cima F, Sabbadin A. Phagocyte spreading and phagocytosis in the compound ascidian Botryllus schlosseri: evidence for an integrin-like, RGD-dependent recognition mechanism. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2002; 26:345-354. [PMID: 11888649 DOI: 10.1016/s0145-305x(01)00082-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The involvement of integrins in phagocyte spreading and phagocytosis was investigated in the compound ascidian Botryllus schlosseri. The number of spreading cells was significantly reduced when adhesion occurred in the presence of the tetrapeptide Arg--Gly--Asp--Ser (RGDS), but not of Arg--Gly--Glu--Ser (RGES) indicating the involvement of RGD-mediated adhesion mechanisms in phagocyte spreading. The significant decrease of the fraction of spreading cells in the presence of Botryllus blood plasma suggests the presence of RGD-containing molecules in the blood of our species. The increase in the same index when blood plasma-coated slides as well as fibrinogen- and fibronectin-coated coverslips were used, fits with the above hypothesis. Adhesion in the presence of RGDS leads to a consistent alteration of the actin cytoskeleton, in agreement with the known role of integrin adhesion in microfilament organization. Phagocytosis was greatly reduced by RGDS in the incubation medium, but not by RGES, and was significantly increased by coating yeast cells with fibronectin or blood plasma. Both spreading and phagocytic capability were severely inhibited by wortmannin, suggesting the importance of phosphatidylinositol-3-kinase in integrin-mediated signal transduction in ascidians.
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Affiliation(s)
- Loriano Ballarin
- Department of Biology, University of Padova, Via U. Bassi 58/B, 35131, Padova, Italy.
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37
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White ES, Livant DL, Markwart S, Arenberg DA. Monocyte-fibronectin interactions, via alpha(5)beta(1) integrin, induce expression of CXC chemokine-dependent angiogenic activity. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2001; 167:5362-6. [PMID: 11673553 DOI: 10.4049/jimmunol.167.9.5362] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Monocyte-derived macrophages are important sources of angiogenic factors in cancer and other disease states. Upon extravasation from vasculature, monocytes encounter the extracellular matrix. We hypothesized that interaction with extracellular matrix proteins leads monocytes to adopt an angiogenic phenotype. We performed endothelial cell chemotaxis assays on conditioned medium (CM) from monocytes that had been cultured in vitro on various matrix substrates (collagen I, laminin, Matrigel, fibronectin), in the presence of autologous serum, or on tissue culture plastic alone. Monocytes cultured on Matrigel and on fibronectin were the most potent inducers of angiogenic activity compared with tissue culture plastic or autologous serum-differentiated monocytes. This increased angiogenic activity was associated with increased expression of angiogenic CXC chemokines (IL-8, epithelial neutrophil-activating peptide-78, growth-related oncogene alpha, and growth-related oncogene gamma) but not of vascular endothelial growth factor. Additionally, CM from monocytes cultured on fibronectin-depleted Matrigel (MG(FN-)) induced significantly less angiogenic activity than CM from monocytes cultured on control-depleted Matrigel. ELISA analysis of CM from monocytes cultured on MG(FN-) revealed a significant decrease in GRO-alpha and GRO-gamma compared with CM from monocytes cultured on MG. Incubation of monocytes before adherence on fibronectin with PHSCN (a competitive peptide inhibitor of the PHSRN sequence of fibronectin binding via alpha(5)beta(1) integrin) results in diminished expression of angiogenic activity and CXC chemokines compared with control peptide. These data suggest that fibronectin, via alpha(5)beta(1) integrin, promotes CXC chemokine-dependent angiogenic activity from monocytes.
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Affiliation(s)
- E S White
- Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, University of Michigan Medical School, Ann Arbor, MI 48109, USA
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38
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Platt N, Suzuki H, Kodama T, Gordon S. Apoptotic thymocyte clearance in scavenger receptor class A-deficient mice is apparently normal. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2000; 164:4861-7. [PMID: 10779795 DOI: 10.4049/jimmunol.164.9.4861] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Studies of apoptotic cell uptake by phagocytes in vitro have implicated a number of different receptors capable of mediating ingestion. However, there is currently little evidence for involvement of any of these candidate receptors in vivo. Previously, we have shown by the use of a blocking mAb against the class A scavenger receptor (SR-A) and thymic macrophages prepared from SR-A null mice, that this receptor is responsible for approximately 50% of the uptake of apoptotic thymocytes in vitro. In this study we have investigated the frequency of dying cells in the thymus of mice lacking SR-A. Our inability to demonstrate increased frequencies of nonphagocytosed Annexin V+, TUNEL+, or propidium iodide+ apoptotic thymocytes suggests there is no deficiency in apoptotic thymocyte clearance in these mice. Even when the rate of thymocyte apoptosis was increased by exposure of receptor-deficient mice to gamma irradiation, we did not detect a difference in the numbers of dying cells compared with similarly treated wild-type animals. This provides the first direct evidence of redundancy in apoptotic cell clearance mechanisms in vivo.
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Affiliation(s)
- N Platt
- Sir William Dunn School of Pathology, University of Oxford, Oxford, United Kingdom.
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39
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Giles KM, Hart SP, Haslett C, Rossi AG, Dransfield I. An appetite for apoptotic cells? Controversies and challenges. Br J Haematol 2000; 109:1-12. [PMID: 10848776 DOI: 10.1046/j.1365-2141.2000.01805.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- K M Giles
- The Rayne Laboratory, Respiratory Medicine Unit, University of Edinburgh, Medical School, Teviot Place, Edinburgh, EH8 9AG, UK
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40
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Sheikh H, Yarwood H, Ashworth A, Isacke CM. Endo180, an endocytic recycling glycoprotein related to the macrophage mannose receptor is expressed on fibroblasts, endothelial cells and macrophages and functions as a lectin receptor. J Cell Sci 2000; 113 ( Pt 6):1021-32. [PMID: 10683150 DOI: 10.1242/jcs.113.6.1021] [Citation(s) in RCA: 113] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Endo180 was previously characterized as a novel, cell type specific, recycling transmembrane glycoprotein. This manuscript describes the isolation of a full length human Endo180 cDNA clone which was shown to encode a fourth member of a family of proteins comprising the macrophage mannose receptor, the phospholipase A(2) receptor and the DEC-205/MR6 receptor. This receptor family is unusual in that they contain 8–10 C-type lectin carbohydrate recognition domains in a single polypeptide backbone, however, only the macrophage mannose receptor had been shown to function as a lectin. Sequence analysis of Endo180 reveals that the second carbohydrate recognition domain has retained key conserved amino acids found in other functional C-type lectins. Furthermore, it is demonstrated that this protein displays Ca(2+)-dependent binding to N-acetylglucosamine but not mannose affinity columns. In order to characterize the physiological function of Endo180, a series of biochemical and morphological studies were undertaken. Endo180 is found to be predominantly expressed in vivo and in vitro on fibroblasts, endothelial cells and macrophages, and the distribution and post-translational processing in these cells is consistent with Endo180 functioning to internalize glycosylated ligands from the extracellular milieu for release in an endosomal compartment.
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Affiliation(s)
- H Sheikh
- Department of Biology, Sir Alexander Fleming Building, Imperial College of Science, Technology and Medicine, Imperial College Road, London SW7 2AZ, UK
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Godson C, Mitchell S, Harvey K, Petasis NA, Hogg N, Brady HR. Cutting edge: lipoxins rapidly stimulate nonphlogistic phagocytosis of apoptotic neutrophils by monocyte-derived macrophages. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2000; 164:1663-7. [PMID: 10657608 DOI: 10.4049/jimmunol.164.4.1663] [Citation(s) in RCA: 462] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Lipoxins (LX) are lipoxygenase-derived eicosanoids generated during inflammation. LX inhibit polymorphonuclear neutrophil (PMN) chemotaxis and adhesion and are putative braking signals for PMN-mediated tissue injury. In this study, we report that LXA4 promotes another important step in the resolution phase of inflammation, namely, phagocytosis of apoptotic PMN by monocyte-derived macrophages (Mphi). LXA4 triggered rapid, concentration-dependent uptake of apoptotic PMN. This bioactivity was shared by stable synthetic LXA4 analogues (picomolar concentrations) but not by other eicosanoids tested. LXA4-triggered phagocytosis did not provoke IL-8 or monocyte chemoattractant protein-1 release. LXA4-induced phagocytosis was attenuated by anti-CD36, alphavbeta3, and CD18 mAbs. LXA4-triggered PMN uptake was inhibited by pertussis toxin and by 8-bromo-cAMP and was mimicked by Rp-cAMP, a protein kinase A inhibitor. LXA4 attenuated PGE2-stimulated protein kinase A activation in Mphi. These results suggest that LXA4 is an endogenous stimulus for PMN clearance during inflammation and provide a novel rationale for using stable synthetic analogues as anti-inflammatory compounds in vivo.
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Affiliation(s)
- C Godson
- Centre for Molecular Inflammation and Vascular Research, Mater Misericordiae Hospital, Department of Medicine, Dublin, Ireland.
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Abstract
Until very recently, the function of CD14 was thought to be limited to innate immune responses to bacterial and other microbial structures. It is now known that macrophage CD14 serves an additional unexpected function, namely as a receptor involved in the recognition and phagocytosis of cells undergoing apoptosis. In stark contrast to its role in eliciting pro-inflammatory responses following binding of microbial ligands, macrophage CD14 mediates clearance of apoptotic cells without inciting inflammation. Increasing interest in the profoundly important final stage of apoptosis - the engulfment process - together with significant advances in knowledge of the immunological consequences of apoptotic-cell clearance and of the means by which signal transduction may be achieved following CD14-ligand binding have begun to produce a clearer picture of the role of CD14 in the immune system.
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Affiliation(s)
- C D Gregory
- D Floor, Institute of Cell Signalling and School of Biomedical Sciences, University of Nottingham Medical School, Queen's Medical Centre, Nottingham, NG7 2UH, UK.
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43
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Gowen BB, Borg TK, Ghaffar A, Mayer EP. Selective adhesion of macrophages to denatured forms of type I collagen is mediated by scavenger receptors. Matrix Biol 2000; 19:61-71. [PMID: 10686426 DOI: 10.1016/s0945-053x(99)00052-9] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Macrophages (Mφs) are multifunctional immune cells which are involved in the regulation of immune and inflammatory responses, as well as in tissue repair and remodeling. In tissues, Mφs reside in areas which are rich in extracellular matrix (ECM), the structural component which also plays an essential role in regulating a variety of cellular functions. A major ECM protein encountered by Mφs is type I collagen, the most abundant of the fibril-forming collagens. In this study, the adhesion of RAW 264.7 murine Mphis to native fibrillar, monomeric, and denatured type I collagen was investigated. Using atomic force microscopy, structural differences between fibrillar and monomeric type I collagen were clearly resolved. When cultured on fibrillar type I collagen, Mphis adhered poorly. In contrast, they adhered significantly to monomeric, heat-denatured, or collagenase-modified type I collagen. Studies utilizing anti-beta1 and -beta2 integrin adhesion-blocking antibodies, RGD-containing peptides, or divalent cation-free conditions did not inhibit Mphi; adhesion to monomeric or denatured type I collagen. However, macrophage scavenger receptor (MSR) ligands and anti-MSR antibodies significantly blocked Mphi; adhesion to denatured and monomeric type I collagen strongly suggesting the involvement of the MSR as an adhesion molecule for denatured type I collagen. Further analysis by Western blot identified the MSR as the primary receptor for denatured type I collagen among Mphi; proteins purified from a heat-denatured type I collagen affinity column. These findings indicate that Mphis adhere selectively to denatured forms of type I collagen, but not the native fibrillar conformation, via their scavenger receptors.
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Affiliation(s)
- B B Gowen
- Department of Microbiology and Immunology, University of South Carolina, School of Medicine, Columbia 29208, USA
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