201
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Berndt JD, Wong W. 2014: signaling breakthroughs of the year. Sci Signal 2015; 8:eg1. [PMID: 25564676 DOI: 10.1126/scisignal.aaa4696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The 2014 breakthroughs fell into four main areas: innate immunity, host-microbe interactions, cell death signaling, and methodological advances in the study of cell signaling. Nominations included new discoveries about signaling in innate immune cells, innate immune functions for lymphoid and nonhematological cells, and the importance of host-microbe interactions for the regulation of host physiology. Also this year, we received nominations highlighting molecular mechanisms by which p53 contributes to the pathology of chronic inflammation and how signaling pathways mediate programmed necrotic cell death. Finally, 2014 saw the use of new techniques to study cell signaling and identify drug targets, such as the in vivo use of RNA interference to study signaling in T cells and new computational methods to study large datasets of different data types.
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Affiliation(s)
- Jason D Berndt
- Associate Editor of Science Signaling, American Association for the Advancement of Science, 1200 New York Avenue, N.W., Washington, DC 20005, USA.
| | - Wei Wong
- Senior Editor of Science Signaling, American Association for the Advancement of Science, 1200 New York Avenue, N.W., Washington, DC 20005, USA.
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202
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Brubaker SW, Bonham KS, Zanoni I, Kagan JC. Innate immune pattern recognition: a cell biological perspective. Annu Rev Immunol 2015; 33:257-90. [PMID: 25581309 DOI: 10.1146/annurev-immunol-032414-112240] [Citation(s) in RCA: 988] [Impact Index Per Article: 109.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Receptors of the innate immune system detect conserved determinants of microbial and viral origin. Activation of these receptors initiates signaling events that culminate in an effective immune response. Recently, the view that innate immune signaling events rely on and operate within a complex cellular infrastructure has become an important framework for understanding the regulation of innate immunity. Compartmentalization within this infrastructure provides the cell with the ability to assign spatial information to microbial detection and regulate immune responses. Several cell biological processes play a role in the regulation of innate signaling responses; at the same time, innate signaling can engage cellular processes as a form of defense or to promote immunological memory. In this review, we highlight these aspects of cell biology in pattern-recognition receptor signaling by focusing on signals that originate from the cell surface, from endosomal compartments, and from within the cytosol.
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Affiliation(s)
- Sky W Brubaker
- Division of Gastroenterology, Boston Children's Hospital, Harvard Medical School, Boston, Massachusetts 02115; , , ,
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203
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Argüello RJ, Rodriguez Rodrigues C, Gatti E, Pierre P. Protein synthesis regulation, a pillar of strength for innate immunity? Curr Opin Immunol 2014; 32:28-35. [PMID: 25553394 DOI: 10.1016/j.coi.2014.12.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 12/04/2014] [Accepted: 12/10/2014] [Indexed: 12/31/2022]
Abstract
Recognition of pathogen derived molecules by Pattern Recognition Receptors (PRR) induces the production of cytokines (i.e. type I interferons) that stimulate the surrounding cells to transcribe and translate hundreds of genes, in order to prevent further infection and organize the immune response. Here, we report on the rising matter that metabolism sensing and gene expression control at the level of mRNA translation, allow swift responses that mobilize host defenses and coordinate innate responses to infection.
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Affiliation(s)
- Rafael J Argüello
- Centre d'Immunologie de Marseille-Luminy, Aix-Marseille Université, U2M, 13288 Marseille, France; INSERM, U1104, 13288 Marseille, France; CNRS, UMR 7280, 13288 Marseille, France
| | - Christian Rodriguez Rodrigues
- Centre d'Immunologie de Marseille-Luminy, Aix-Marseille Université, U2M, 13288 Marseille, France; INSERM, U1104, 13288 Marseille, France; CNRS, UMR 7280, 13288 Marseille, France
| | - Evelina Gatti
- Centre d'Immunologie de Marseille-Luminy, Aix-Marseille Université, U2M, 13288 Marseille, France; INSERM, U1104, 13288 Marseille, France; CNRS, UMR 7280, 13288 Marseille, France; Institute for Research in Biomedicine - iBiMED and Aveiro Health Sciences Program, University of Aveiro, 3810-193 Aveiro, Portugal.
| | - Philippe Pierre
- Centre d'Immunologie de Marseille-Luminy, Aix-Marseille Université, U2M, 13288 Marseille, France; INSERM, U1104, 13288 Marseille, France; CNRS, UMR 7280, 13288 Marseille, France; Institute for Research in Biomedicine - iBiMED and Aveiro Health Sciences Program, University of Aveiro, 3810-193 Aveiro, Portugal.
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204
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Compeer EB, Boes M. MICAL-L1-related and unrelated mechanisms underlying elongated tubular endosomal network (ETEN) in human dendritic cells. Commun Integr Biol 2014; 7:e994969. [PMID: 26478765 PMCID: PMC4594581 DOI: 10.4161/19420889.2014.994969] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 07/29/2014] [Indexed: 01/03/2023] Open
Abstract
The endosomal pathway constitutes a highly dynamic intracellular transport system, which is composed of vesicular and tubular compartments. Endosomal tubules enable geometry-based discrimination between membrane and luminal content. Extended tubular endosomes were suggested to deliver a steady stream of membrane proteins to one location more reliable and effective than vesicular endosomes. Recently, we demonstrated that human dendritic cells (DCs) form a large elongated tubular endosomal network, e.g. ETEN, upon distinct triggers. LPS-stimulation triggered late endosomal tubulation. Additional clustering of class I MHC and ICAM-1 by a cognate interaction between antigen-laden DC and antigen-specific CD8+ T-cells induces formation of transferrin-positive tubules emanating from the endosomal recycling compartment (ERC). We here discuss cell-biological mechanisms that are involved in membrane bending and possibly underlie initiation, elongation, and stabilization of ETEN in human DCs. Using a knock-down approach we demonstrate that MICAL-L1 is necessary for ETEN remodeling originating from ERC in human DCs.
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Affiliation(s)
- Ewoud B Compeer
- Department of Pediatrics; Laboratory of Translational Immunology; University Medical Center Utrecht; Wilhelmina Children's Hospital ; Utrecht, The Netherlands
| | - Marianne Boes
- Department of Pediatrics; Laboratory of Translational Immunology; University Medical Center Utrecht; Wilhelmina Children's Hospital ; Utrecht, The Netherlands
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205
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Caruso R, Warner N, Inohara N, Núñez G. NOD1 and NOD2: signaling, host defense, and inflammatory disease. Immunity 2014; 41:898-908. [PMID: 25526305 DOI: 10.1016/j.immuni.2014.12.010] [Citation(s) in RCA: 526] [Impact Index Per Article: 52.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Indexed: 12/11/2022]
Abstract
The nucleotide-binding oligomerization domain (NOD) proteins NOD1 and NOD2, the founding members of the intracellular NOD-like receptor family, sense conserved motifs in bacterial peptidoglycan and induce proinflammatory and antimicrobial responses. Here, we discuss recent developments about the mechanisms by which NOD1 and NOD2 are activated by bacterial ligands, the regulation of their signaling pathways, and their role in host defense and inflammatory disease. Several routes for the entry of peptidoglycan ligands to the host cytosol to trigger activation of NOD1 and NOD2 have been elucidated. Furthermore, genetic screens and biochemical analyses have revealed mechanisms that regulate NOD1 and NOD2 signaling. Finally, recent studies have suggested several mechanisms to account for the link between NOD2 variants and susceptibility to Crohn's disease. Further understanding of NOD1 and NOD2 should provide new insight into the pathogenesis of disease and the development of new strategies to treat inflammatory and infectious disorders.
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Affiliation(s)
- Roberta Caruso
- Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Neil Warner
- Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Naohiro Inohara
- Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109, USA
| | - Gabriel Núñez
- Department of Pathology and Comprehensive Cancer Center, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
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206
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Abstract
Pattern recognition receptors are essential mediators of host defense and inflammation in the gastrointestinal system. Recent data have revealed that toll-like receptors and nucleotide-binding domain and leucine-rich repeat-containing proteins (NLRs) function to maintain homeostasis between the host microbiome and mucosal immunity. The NLR proteins are a diverse class of cytoplasmic pattern recognition receptors. In humans, only about half of the identified NLRs have been adequately characterized. The majority of well-characterized NLRs participate in the formation of a multiprotein complex, termed the inflammasome, which is responsible for the maturation of interleukin-1β and interleukin-18. However, recent observations have also uncovered the presence of a novel subgroup of NLRs that function as positive or negative regulators of inflammation through modulating critical signaling pathways, including NF-κB. Dysregulation of specific NLRs from both proinflammatory and inhibitory subgroups have been associated with the development of inflammatory bowel disease (IBD) in genetically susceptible human populations. Our own preliminary retrospective data mining efforts have identified a diverse range of NLRs that are significantly altered at the messenger RNA level in colons from patients with IBD. Likewise, studies using genetically modified mouse strains have revealed that multiple NLR family members have the potential to dramatically modulate the immune response during IBD. Targeting NLR signaling represents a promising and novel therapeutic strategy. However, significant effort is necessary to translate the current understanding of NLR biology into effective therapies.
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207
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Blander JM. A long-awaited merger of the pathways mediating host defence and programmed cell death. Nat Rev Immunol 2014; 14:601-18. [PMID: 25145756 DOI: 10.1038/nri3720] [Citation(s) in RCA: 188] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Historically, cell death and inflammation have been closely linked, but the necessary divergence of the fields in the past few decades has enriched our molecular understanding of the signalling pathways that mediate various programmes of cell death and multiple types of inflammatory responses. The fields have now come together again demonstrating a surprising level of integration. Intimate interconnections at multiple levels are revealed between the cell death and inflammatory signal transduction pathways that are mobilized in response to the engagement of pattern recognition receptors during microbial infection. Molecules such as receptor-interacting protein kinase 1 (RIPK1), RIPK3, FAS-associated death domain protein (FADD), FLICE-like inhibitory protein (FLIP) and caspase 8 - which are associated with different forms of cell death - are incorporated into compatible and exceedingly dynamic Toll-like receptor, NOD-like receptor and RIG-I-like receptor signalling modules. These signalling modules have a high capacity to switch from inflammation to cell death, or a programmed execution of both, all in an orchestrated battle for host defence and survival.
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Affiliation(s)
- J Magarian Blander
- Immunology Institute and Tisch Cancer Institute, Department of Medicine, Icahn School of Medicine at Mount Sinai, New York, New York 10029, USA
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208
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Hato T, Dagher PC. How the Innate Immune System Senses Trouble and Causes Trouble. Clin J Am Soc Nephrol 2014; 10:1459-69. [PMID: 25414319 DOI: 10.2215/cjn.04680514] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The innate immune system is the first line of defense in response to nonself and danger signals from microbial invasion or tissue injury. It is increasingly recognized that each organ uses unique sets of cells and molecules that orchestrate regional innate immunity. The cells that execute the task of innate immunity are many and consist of not only "professional" immune cells but also nonimmune cells, such as renal epithelial cells. Despite a high level of sophistication, deregulated innate immunity is common and contributes to a wide range of renal diseases, such as sepsis-induced kidney injury, GN, and allograft dysfunction. This review discusses how the innate immune system recognizes and responds to nonself and danger signals. In particular, the roles of renal epithelial cells that make them an integral part of the innate immune apparatus of the kidney are highlighted.
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Affiliation(s)
- Takashi Hato
- Department of Medicine, Indiana University, Indianapolis, Indiana
| | - Pierre C Dagher
- Department of Medicine, Indiana University, Indianapolis, Indiana
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209
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Pavot V, Rochereau N, Rességuier J, Gutjahr A, Genin C, Tiraby G, Perouzel E, Lioux T, Vernejoul F, Verrier B, Paul S. Cutting edge: New chimeric NOD2/TLR2 adjuvant drastically increases vaccine immunogenicity. THE JOURNAL OF IMMUNOLOGY 2014; 193:5781-5. [PMID: 25392526 DOI: 10.4049/jimmunol.1402184] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
TLR ligands are critical activators of innate immunity and are being developed as vaccine adjuvants. However, their usefulness in conjunction with NOD-like receptor agonists remains poorly studied. In this study, we evaluated a new ligand that targets both TLR2 and NOD2 receptors. We assessed its ability to enhance dendritic cell maturation in vitro in addition to improving systemic and mucosal immune responses in mice. The chimeric NOD2/TLR2 ligand induced synergistic upregulation of dendritic cell maturation markers, costimulatory molecules, and secretion of proinflammatory cytokines compared with combinations of separate ligands. Furthermore, when coadministered with biodegradable nanoparticles carrying a model Ag, the ligand was able to induce high Ag-specific IgA and IgG titers at both systemic and mucosal sites after parenteral immunizations. These findings point out the potential utility of chimeric molecules TLR/NOD as adjuvants for vaccines to induce systemic and mucosal immune responses.
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Affiliation(s)
- Vincent Pavot
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5305, Université de Lyon, Lyon F-69007, France; Groupe Immunité des Muqueuses et Agents Pathogènes, INSERM Centre d'Investigation Clinique en Vaccinologie 1408, Université de Lyon, Saint-Etienne F-42023, France; and
| | - Nicolas Rochereau
- Groupe Immunité des Muqueuses et Agents Pathogènes, INSERM Centre d'Investigation Clinique en Vaccinologie 1408, Université de Lyon, Saint-Etienne F-42023, France; and
| | - Julien Rességuier
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5305, Université de Lyon, Lyon F-69007, France
| | - Alice Gutjahr
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5305, Université de Lyon, Lyon F-69007, France; Groupe Immunité des Muqueuses et Agents Pathogènes, INSERM Centre d'Investigation Clinique en Vaccinologie 1408, Université de Lyon, Saint-Etienne F-42023, France; and Cayla-InvivoGen, Toulouse F-31000, France
| | - Christian Genin
- Groupe Immunité des Muqueuses et Agents Pathogènes, INSERM Centre d'Investigation Clinique en Vaccinologie 1408, Université de Lyon, Saint-Etienne F-42023, France; and
| | | | | | | | | | - Bernard Verrier
- Centre National de la Recherche Scientifique, Unité Mixte de Recherche 5305, Université de Lyon, Lyon F-69007, France
| | - Stéphane Paul
- Groupe Immunité des Muqueuses et Agents Pathogènes, INSERM Centre d'Investigation Clinique en Vaccinologie 1408, Université de Lyon, Saint-Etienne F-42023, France; and
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210
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Parkhouse R, Boyle JP, Monie TP. Blau syndrome polymorphisms in NOD2 identify nucleotide hydrolysis and helical domain 1 as signalling regulators. FEBS Lett 2014; 588:3382-9. [PMID: 25093298 PMCID: PMC4158908 DOI: 10.1016/j.febslet.2014.07.029] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 07/23/2014] [Accepted: 07/23/2014] [Indexed: 12/17/2022]
Abstract
NOD2 SNPs that cause Blau syndrome cluster in two regions of the NACHT. The ATP/Mg2+ binding pocket cluster are likely to dysregulate ATP hydrolysis. SNPs in helical domain 1 are predicted to influence receptor autoinhibition. Complementary mutations in NOD1 do not all result in hyperactivation.
Understanding how single nucleotide polymorphisms (SNPs) lead to disease at a molecular level provides a starting point for improved therapeutic intervention. SNPs in the innate immune receptor nucleotide oligomerisation domain 2 (NOD2) can cause the inflammatory disorders Blau Syndrome (BS) and early onset sarcoidosis (EOS) through receptor hyperactivation. Here, we show that these polymorphisms cluster into two primary locations: the ATP/Mg2+-binding site and helical domain 1. Polymorphisms in these two locations may consequently dysregulate ATP hydrolysis and NOD2 autoinhibition, respectively. Complementary mutations in NOD1 did not mirror the NOD2 phenotype, which indicates that NOD1 and NOD2 are activated and regulated by distinct methods.
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Affiliation(s)
| | - Joseph P Boyle
- Department of Biochemistry, University of Cambridge, Cambridge, UK; Department of Veterinary Medicine, University of Cambridge, Cambridge, UK
| | - Tom P Monie
- Department of Biochemistry, University of Cambridge, Cambridge, UK; Department of Veterinary Medicine, University of Cambridge, Cambridge, UK.
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211
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Saxena M, Yeretssian G. NOD-Like Receptors: Master Regulators of Inflammation and Cancer. Front Immunol 2014; 5:327. [PMID: 25071785 PMCID: PMC4095565 DOI: 10.3389/fimmu.2014.00327] [Citation(s) in RCA: 164] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2014] [Accepted: 06/27/2014] [Indexed: 12/11/2022] Open
Abstract
Cytosolic NOD-like receptors (NLRs) have been associated with human diseases including infections, cancer, and autoimmune and inflammatory disorders. These innate immune pattern recognition molecules are essential for controlling inflammatory mechanisms through induction of cytokines, chemokines, and anti-microbial genes. Upon activation, some NLRs form multi-protein complexes called inflammasomes, while others orchestrate caspase-independent nuclear factor kappa B (NF-κB) and mitogen activated protein kinase (MAPK) signaling. Moreover, NLRs and their downstream signaling components engage in an intricate crosstalk with cell death and autophagy pathways, both critical processes for cancer development. Recently, increasing evidence has extended the concept that chronic inflammation caused by abberant NLR signaling is a powerful driver of carcinogenesis, where it abets genetic mutations, tumor growth, and progression. In this review, we explore the rapidly expanding area of research regarding the expression and functions of NLRs in different types of cancers. Furthermore, we particularly focus on how maintaining tissue homeostasis and regulating tissue repair may provide a logical platform for understanding the liaisons between the NLR-driven inflammatory responses and cancer. Finally, we outline novel therapeutic approaches that target NLR signaling and speculate how these could be developed as potential pharmaceutical alternatives for cancer treatment.
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Affiliation(s)
- Mansi Saxena
- Department of Medicine, Immunology Institute, Icahn School of Medicine at Mount Sinai , New York, NY , USA
| | - Garabet Yeretssian
- Department of Medicine, Immunology Institute, Icahn School of Medicine at Mount Sinai , New York, NY , USA ; Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai , New York, NY , USA
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212
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Barbé F, Douglas T, Saleh M. Advances in Nod-like receptors (NLR) biology. Cytokine Growth Factor Rev 2014; 25:681-97. [PMID: 25070125 DOI: 10.1016/j.cytogfr.2014.07.001] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2014] [Accepted: 07/03/2014] [Indexed: 12/27/2022]
Abstract
The innate immune system is composed of a wide repertoire of conserved pattern recognition receptors (PRRs) able to trigger inflammation and host defense mechanisms in response to endogenous or exogenous pathogenic insults. Among these, nucleotide-binding and oligomerization domain (NOD)-like receptors (NLRs) are intracellular sentinels of cytosolic sanctity capable of orchestrating innate immunity and inflammatory responses following the perception of noxious signals within the cell. In this review, we elaborate on recent advances in the signaling mechanisms of NLRs, operating within inflammasomes or through alternative inflammatory pathways, and discuss the spectrum of their effector functions in innate immunity. We describe the progressive characterization of each NLR with associated controversies and cutting edge discoveries.
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Affiliation(s)
- François Barbé
- Department of Microbiology and Immunology, McGill University, Montréal, Québec H3A 2B4, Canada
| | - Todd Douglas
- Department of Microbiology and Immunology, McGill University, Montréal, Québec H3A 2B4, Canada
| | - Maya Saleh
- Department of Microbiology and Immunology, McGill University, Montréal, Québec H3A 2B4, Canada; Department of Medicine, McGill University, Montréal, Québec H3G 0B1, Canada.
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213
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Abstract
The NOD-like receptors (NLRs) were among the first innate immune receptors discovered, yet a clear understanding of the basic principles underlying their mechanisms of action is lacking. Two recent studies provide important cell biological insights into the subcellular sites of NOD1- and NOD2-dependent signaling.
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Affiliation(s)
- Kevin S Bonham
- Boston Children's Hospital and Harvard Medical School, 300 Longwood Avenue, Boston, MA 02446, USA
| | - Jonathan C Kagan
- Boston Children's Hospital and Harvard Medical School, 300 Longwood Avenue, Boston, MA 02446, USA.
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