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Luque-Martin R, Mander PK, Leenen PJM, Winther MPJ. Classic and new mediators for in vitro modelling of human macrophages. J Leukoc Biol 2020; 109:549-560. [PMID: 32592421 PMCID: PMC7984372 DOI: 10.1002/jlb.1ru0620-018r] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2020] [Revised: 06/04/2020] [Accepted: 06/05/2020] [Indexed: 02/06/2023] Open
Abstract
Macrophages are key immune cells in the activation and regulation of immune responses. These cells are present in all tissues under homeostatic conditions and in many disease settings. Macrophages can exhibit a wide range of phenotypes depending on local and systemic cues that drive the differentiation and activation process. Macrophage heterogeneity is also defined by their ontogeny. Tissue macrophages can either derive from circulating blood monocytes or are seeded as tissue-resident macrophages during embryonic development. In humans, the study of in vivo-generated macrophages is often difficult with laborious and cell-changing isolation procedures. Therefore, translatable, reproducible, and robust in vitro models for human macrophages in health and disease are necessary. Most of the methods for studying monocyte-derived macrophages are based on the use of limited factors to differentiate the monocytes into macrophages. Current knowledge shows that the in vivo situation is more complex, and a wide range of molecules in the tissue microenvironment promote and impact on monocyte to macrophage differentiation as well as activation. In this review, macrophage heterogeneity is discussed and the human in vitro models that can be applied for research, especially for monocyte-derived macrophages. We also focus on new molecules (IL-34, platelet factor 4, etc.) used to generate macrophages expressing different phenotypes.
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Affiliation(s)
- Rosario Luque-Martin
- Amsterdam University Medical Centers, University of Amsterdam, Department of Medical Biochemistry, Amsterdam Cardiovascular Sciences, Amsterdam, The Netherlands
| | | | - Pieter J M Leenen
- Erasmus University Medical Center, Department of Immunology, Rotterdam, The Netherlands
| | - Menno P J Winther
- Amsterdam University Medical Centers, University of Amsterdam, Department of Medical Biochemistry, Amsterdam Cardiovascular Sciences, Amsterdam, The Netherlands.,Institute for Cardiovascular Prevention (IPEK), Munich, Germany
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Baruah S, Murthy S, Keck K, Galvan I, Prichard A, Allen LAH, Farrelly M, Klesney-Tait J. TREM-1 regulates neutrophil chemotaxis by promoting NOX-dependent superoxide production. J Leukoc Biol 2019; 105:1195-1207. [PMID: 30667543 DOI: 10.1002/jlb.3vma0918-375r] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Revised: 12/01/2018] [Accepted: 12/13/2018] [Indexed: 01/15/2023] Open
Abstract
Neutrophil migration across tissue barriers to the site of injury involves integration of complex danger signals and is critical for host survival. Numerous studies demonstrate that these environmental signals fundamentally alter the responses of extravasated or "primed" neutrophils. Triggering receptor expressed on myeloid cells 1 (TREM-1) plays a central role in modulating inflammatory signaling and neutrophil migration into the alveolar airspace. Using a genetic approach, we examined the role of TREM-1 in extravasated neutrophil function. Neutrophil migration in response to chemoattractants is dependent upon multiple factors, including reactive oxygen species (ROS) generated either extracellularly by epithelial cells or intracellularly by NADPH oxidase (NOX). We, therefore, questioned whether ROS were responsible for TREM-1-mediated regulation of migration. Thioglycollate-elicited peritoneal neutrophils isolated from wild-type (WT) and TREM-1-deficient mice were stimulated with soluble and particulate agonists. Using electron paramagnetic resonance spectroscopy, we demonstrated that NOX2-dependent superoxide production is impaired in TREM-1-deficient neutrophils. Consistent with these findings, we confirmed with Clark electrode that TREM-1-deficient neutrophils consume less oxygen. Next, we demonstrated that TREM-1 deficient neutrophils have impaired directional migration to fMLP and zymosan-activated serum as compared to WT neutrophils and that deletion or inhibition of NOX2 in WT but not TREM-1-deficient neutrophils significantly impaired direction sensing. Finally, TREM-1 deficiency resulted in decreased protein kinase B (AKT) activation. Thus, TREM-1 regulates neutrophil migratory properties, in part, by promoting AKT activation and NOX2-dependent superoxide production. These findings provide the first mechanistic evidence as to how TREM-1 regulates neutrophil migration.
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Affiliation(s)
- Sankar Baruah
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Shubha Murthy
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Kathy Keck
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Isabel Galvan
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Allan Prichard
- Department of Microbiology and Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.,Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Lee-Ann H Allen
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.,Department of Microbiology and Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.,Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.,Iowa City VA Healthcare System, Iowa City, Iowa, USA
| | - Mary Farrelly
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Julia Klesney-Tait
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
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Rogers KJ, Maury W. The role of mononuclear phagocytes in Ebola virus infection. J Leukoc Biol 2018; 104:717-727. [PMID: 30095866 DOI: 10.1002/jlb.4ri0518-183r] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 07/09/2018] [Accepted: 07/12/2018] [Indexed: 12/17/2022] Open
Abstract
The filovirus, Zaire Ebolavirus (EBOV), infects tissue macrophages (Mϕs) and dendritic cells (DCs) early during infection. Viral infection of both cells types is highly productive, leading to increased viral load. However, virus infection of these two cell types results in different consequences for cellular function. Infection of Mϕs stimulates the production of proinflammatory and immunomodulatory cytokines and chemokines, leading to the production of a cytokine storm, while simultaneously increasing tissue factor production and thus facilitating disseminated intravascular coagulation. In contrast, EBOV infection of DCs blocks DC maturation and antigen presentation rendering these cells unable to communicate with adaptive immune response elements. Details of the known interactions of these cells with EBOV are reviewed here. We also identify a number of unanswered questions that remain about interactions of filoviruses with these cells.
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Affiliation(s)
- Kai J Rogers
- Department of Microbiology and Immunology, University of Iowa, Iowa City, Iowa, USA
| | - Wendy Maury
- Department of Microbiology and Immunology, University of Iowa, Iowa City, Iowa, USA
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Nicolás-Ávila JA, Hidalgo A, Ballesteros I. Specialized functions of resident macrophages in brain and heart. J Leukoc Biol 2018; 104:743-756. [PMID: 29947422 DOI: 10.1002/jlb.6mr0118-041r] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Revised: 05/08/2018] [Accepted: 05/30/2018] [Indexed: 12/16/2022] Open
Abstract
The functions of macrophages in healthy tissues extend beyond their well-established roles as immune sentinels and effectors. Among tissues, cells of the brain and heart possess unique excitatory properties that likely demand special support. Accordingly, existing evidence demonstrates that microglia in the brain has an active role in synaptic organization, control of neuronal excitability, phagocytic removal of debris, and trophic support during brain development. In the heart, recent studies suggest that cardiac macrophages are involved in the regulation of heart homeostasis by phagocytosis, production of trophic, and immune-related factors, and by forming direct contacts with cardiomyocytes to regulate electrical conduction. In this review, we discuss mechanisms associated with the high degree of specialization of resident macrophages in both tissues, their origin and heterogeneity, and their contributions in regulating homeostasis under steady-state and pathological conditions.
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Affiliation(s)
| | - Andrés Hidalgo
- Area of Cell and Developmental Biology, Fundación CNIC, Madrid, Spain
| | - Iván Ballesteros
- Area of Cell and Developmental Biology, Fundación CNIC, Madrid, Spain
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