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Meizlish ML, Kimura Y, Pope SD, Matta R, Kim C, Philip NH, Meyaard L, Gonzalez A, Medzhitov R. Mechanosensing regulates tissue repair program in macrophages. Sci Adv 2024; 10:eadk6906. [PMID: 38478620 PMCID: PMC10936955 DOI: 10.1126/sciadv.adk6906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 01/29/2024] [Indexed: 03/17/2024]
Abstract
Tissue-resident macrophages play important roles in tissue homeostasis and repair. However, how macrophages monitor and maintain tissue integrity is not well understood. The extracellular matrix (ECM) is a key structural and organizational component of all tissues. Here, we find that macrophages sense the mechanical properties of the ECM to regulate a specific tissue repair program. We show that macrophage mechanosensing is mediated by cytoskeletal remodeling and can be performed in three-dimensional environments through a noncanonical, integrin-independent mechanism analogous to amoeboid migration. We find that these cytoskeletal dynamics also integrate biochemical signaling by colony-stimulating factor 1 and ultimately regulate chromatin accessibility to control the mechanosensitive gene expression program. This study identifies an "amoeboid" mode of ECM mechanosensing through which macrophages may regulate tissue repair and fibrosis.
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Affiliation(s)
- Matthew L. Meizlish
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
- Department of Medicine, Massachusetts General Hospital, Boston, MA, USA
| | - Yoshitaka Kimura
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Scott D. Pope
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Rita Matta
- Department of Biomedical Engineering, Yale University, New Haven, CT, USA
| | - Catherine Kim
- Department of Biomedical Engineering, Yale University, New Haven, CT, USA
| | - Naomi H. Philip
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Linde Meyaard
- Center for Translational Immunology, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands
- Oncode Institute, Utrecht, Netherlands
| | - Anjelica Gonzalez
- Department of Biomedical Engineering, Yale University, New Haven, CT, USA
| | - Ruslan Medzhitov
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
- Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT, USA
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2
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Zhou X, Franklin RA, Adler M, Carter TS, Condiff E, Adams TS, Pope SD, Philip NH, Meizlish ML, Kaminski N, Medzhitov R. Microenvironmental sensing by fibroblasts controls macrophage population size. Proc Natl Acad Sci U S A 2022; 119:e2205360119. [PMID: 35930670 PMCID: PMC9371703 DOI: 10.1073/pnas.2205360119] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Animal tissues comprise diverse cell types. However, the mechanisms controlling the number of each cell type within tissue compartments remain poorly understood. Here, we report that different cell types utilize distinct strategies to control population numbers. Proliferation of fibroblasts, stromal cells important for tissue integrity, is limited by space availability. In contrast, proliferation of macrophages, innate immune cells involved in defense, repair, and homeostasis, is constrained by growth factor availability. Examination of density-dependent gene expression in fibroblasts revealed that Hippo and TGF-β target genes are both regulated by cell density. We found YAP1, the transcriptional coactivator of the Hippo signaling pathway, directly regulates expression of Csf1, the lineage-specific growth factor for macrophages, through an enhancer of Csf1 that is specifically active in fibroblasts. Activation of YAP1 in fibroblasts elevates Csf1 expression and is sufficient to increase the number of macrophages at steady state. Our data also suggest that expression programs in fibroblasts that change with density may result from sensing of mechanical force through actin-dependent mechanisms. Altogether, we demonstrate that two different modes of population control are connected and coordinated to regulate cell numbers of distinct cell types. Sensing of the tissue environment may serve as a general strategy to control tissue composition.
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Affiliation(s)
- Xu Zhou
- aDepartment of Immunobiology, Yale University School of Medicine, New Haven, CT 06510
| | - Ruth A. Franklin
- aDepartment of Immunobiology, Yale University School of Medicine, New Haven, CT 06510
| | - Miri Adler
- bBroad Institute of MIT and Harvard, Cambridge, MA 02142
| | - Trevor S. Carter
- cDepartment of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139
| | - Emily Condiff
- aDepartment of Immunobiology, Yale University School of Medicine, New Haven, CT 06510
| | - Taylor S. Adams
- dPulmonary Critical Care and Sleep Medicine, Yale University School of Medicine, New Haven, CT 06510
| | - Scott D. Pope
- aDepartment of Immunobiology, Yale University School of Medicine, New Haven, CT 06510
- eHHMI, Yale University School of Medicine, New Haven, CT 06510
| | - Naomi H. Philip
- aDepartment of Immunobiology, Yale University School of Medicine, New Haven, CT 06510
| | - Matthew L. Meizlish
- aDepartment of Immunobiology, Yale University School of Medicine, New Haven, CT 06510
| | - Naftali Kaminski
- dPulmonary Critical Care and Sleep Medicine, Yale University School of Medicine, New Haven, CT 06510
| | - Ruslan Medzhitov
- aDepartment of Immunobiology, Yale University School of Medicine, New Haven, CT 06510
- eHHMI, Yale University School of Medicine, New Haven, CT 06510
- 5To whom correspondence may be addressed.
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3
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Bjanes E, Sillas RG, Matsuda R, Demarco B, Fettrelet T, DeLaney AA, Kornfeld OS, Lee BL, Rodríguez López EM, Grubaugh D, Wynosky-Dolfi MA, Philip NH, Krespan E, Tovar D, Joannas L, Beiting DP, Henao-Mejia J, Schaefer BC, Chen KW, Broz P, Brodsky IE. Genetic targeting of Card19 is linked to disrupted NINJ1 expression, impaired cell lysis, and increased susceptibility to Yersinia infection. PLoS Pathog 2021; 17:e1009967. [PMID: 34648590 PMCID: PMC8547626 DOI: 10.1371/journal.ppat.1009967] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2021] [Revised: 10/26/2021] [Accepted: 09/23/2021] [Indexed: 12/13/2022] Open
Abstract
Cell death plays a critical role in inflammatory responses. During pyroptosis, inflammatory caspases cleave Gasdermin D (GSDMD) to release an N-terminal fragment that generates plasma membrane pores that mediate cell lysis and IL-1 cytokine release. Terminal cell lysis and IL-1β release following caspase activation can be uncoupled in certain cell types or in response to particular stimuli, a state termed hyperactivation. However, the factors and mechanisms that regulate terminal cell lysis downstream of GSDMD cleavage remain poorly understood. In the course of studies to define regulation of pyroptosis during Yersinia infection, we identified a line of Card19-deficient mice (Card19lxcn) whose macrophages were protected from cell lysis and showed reduced apoptosis and pyroptosis, yet had wild-type levels of caspase activation, IL-1 secretion, and GSDMD cleavage. Unexpectedly, CARD19, a mitochondrial CARD-containing protein, was not directly responsible for this, as an independently-generated CRISPR/Cas9 Card19 knockout mouse line (Card19Null) showed no defect in macrophage cell lysis. Notably, Card19 is located on chromosome 13, immediately adjacent to Ninj1, which was recently found to regulate cell lysis downstream of GSDMD activation. RNA-seq and western blotting revealed that Card19lxcn BMDMs have significantly reduced NINJ1 expression, and reconstitution of Ninj1 in Card19lxcn immortalized BMDMs restored their ability to undergo cell lysis in response to caspase-dependent cell death stimuli. Card19lxcn mice exhibited increased susceptibility to Yersinia infection, whereas independently-generated Card19Null mice did not, demonstrating that cell lysis itself plays a key role in protection against bacterial infection, and that the increased infection susceptibility of Card19lxcn mice is attributable to loss of NINJ1. Our findings identify genetic targeting of Card19 being responsible for off-target effects on the adjacent gene Ninj1, disrupting the ability of macrophages to undergo plasma membrane rupture downstream of gasdermin cleavage and impacting host survival and bacterial control during Yersinia infection.
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Affiliation(s)
- Elisabet Bjanes
- Cell and Molecular Biology Graduate Group, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
| | - Reyna Garcia Sillas
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
| | - Rina Matsuda
- Cell and Molecular Biology Graduate Group, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
| | - Benjamin Demarco
- Department of Biochemistry, University of Lausanne, Epalinges, Vaud, Switzerland
| | - Timothée Fettrelet
- Department of Biochemistry, University of Lausanne, Epalinges, Vaud, Switzerland
| | - Alexandra A. DeLaney
- Cell and Molecular Biology Graduate Group, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
| | - Opher S. Kornfeld
- Department of Physiological Chemistry, Genentech Inc., South San Francisco, California, United States of America
| | - Bettina L. Lee
- Department of Physiological Chemistry, Genentech Inc., South San Francisco, California, United States of America
| | - Eric M. Rodríguez López
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
- Immunology Graduate Group, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Daniel Grubaugh
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
| | - Meghan A. Wynosky-Dolfi
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
| | - Naomi H. Philip
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
- Immunology Graduate Group, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Elise Krespan
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
- Center for Host Microbial Interactions, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
| | - Dorothy Tovar
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
| | - Leonel Joannas
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
- CRISPR/Cas9 Mouse Targeting Core, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
| | - Daniel P. Beiting
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
- Center for Host Microbial Interactions, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
- Institute for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
| | - Jorge Henao-Mejia
- Institute for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
- Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
- Division of Protective Immunity, Department of Pathology and Laboratory Medicine, Children’s Hospital of Philadelphia, University of Pennsylvania, Philadelphia, Pennsylvania, United States of America
| | - Brian C. Schaefer
- Department of Microbiology and Immunology, Uniformed Services University, Bethesda, Maryland, United States of America
| | - Kaiwen W. Chen
- Department of Biochemistry, University of Lausanne, Epalinges, Vaud, Switzerland
| | - Petr Broz
- Department of Biochemistry, University of Lausanne, Epalinges, Vaud, Switzerland
| | - Igor E. Brodsky
- Cell and Molecular Biology Graduate Group, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, Pennsylvania, United States of America
- Immunology Graduate Group, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
- Institute for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
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4
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Goods BA, Askenase MH, Markarian E, Beatty HE, Drake RS, Fleming I, DeLong JH, Philip NH, Matouk CC, Awad IA, Zuccarello M, Hanley DF, Love JC, Shalek AK, Sansing LH. Leukocyte dynamics after intracerebral hemorrhage in a living patient reveal rapid adaptations to tissue milieu. JCI Insight 2021; 6:145857. [PMID: 33749664 PMCID: PMC8026179 DOI: 10.1172/jci.insight.145857] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Accepted: 02/17/2021] [Indexed: 12/12/2022] Open
Abstract
Intracerebral hemorrhage (ICH) is a devastating form of stroke with a high mortality rate and few treatment options. Discovery of therapeutic interventions has been slow given the challenges associated with studying acute injury in the human brain. Inflammation induced by exposure of brain tissue to blood appears to be a major part of brain tissue injury. Here, we longitudinally profiled blood and cerebral hematoma effluent from a patient enrolled in the Minimally Invasive Surgery with Thrombolysis in Intracerebral Hemorrhage Evacuation trial, offering a rare window into the local and systemic immune responses to acute brain injury. Using single-cell RNA-Seq (scRNA-Seq), this is the first report to our knowledge that characterized the local cellular response during ICH in the brain of a living patient at single-cell resolution. Our analysis revealed shifts in the activation states of myeloid and T cells in the brain over time, suggesting that leukocyte responses are dynamically reshaped by the hematoma microenvironment. Interestingly, the patient had an asymptomatic rebleed that our transcriptional data indicated occurred prior to detection by CT scan. This case highlights the rapid immune dynamics in the brain after ICH and suggests that sensitive methods such as scRNA-Seq would enable greater understanding of complex intracerebral events.
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Affiliation(s)
- Brittany A. Goods
- Department of Chemistry and Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
- Broad Institute, Harvard University and Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Michael H. Askenase
- Department of Neurology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Erica Markarian
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Hannah E. Beatty
- Department of Neurology, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Riley S. Drake
- Department of Chemistry and Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Ira Fleming
- Department of Chemistry and Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Jonathan H. DeLong
- Department of Neurology, Yale University School of Medicine, New Haven, Connecticut, USA
| | | | - Charles C. Matouk
- Department of Neurosurgery, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Issam A. Awad
- Department of Neurosurgery, University of Chicago, Chicago, Illinois, USA
| | - Mario Zuccarello
- Department of Neurosurgery, University of Cincinnati, Cincinnati, Ohio, USA
| | - Daniel F. Hanley
- Brain Injury Outcomes Division, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
| | - J. Christopher Love
- Broad Institute, Harvard University and Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Alex K. Shalek
- Department of Chemistry and Institute for Medical Engineering and Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
- Broad Institute, Harvard University and Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
- Koch Institute for Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
- Ragon Institute, Harvard University, Massachusetts Institute of Technology, and Massachusetts General Hospital, Cambridge, Massachusetts, USA
- Division of Health Science and Technology, Harvard Medical School, Boston, Massachusetts, USA
- Program in Computational & Systems Biology, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
- Department of Immunology, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Lauren H. Sansing
- Department of Neurology, Yale University School of Medicine, New Haven, Connecticut, USA
- Department of Immunobiology and
- Human and Translational Immunology Program, Yale School of Medicine, New Haven, Connecticut, USA
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5
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Sullivan ZA, Khoury-Hanold W, Lim J, Smillie C, Biton M, Reis BS, Zwick RK, Pope SD, Israni-Winger K, Parsa R, Philip NH, Rashed S, Palm N, Wang A, Mucida D, Regev A, Medzhitov R. γδ T cells regulate the intestinal response to nutrient sensing. Science 2021; 371:eaba8310. [PMID: 33737460 DOI: 10.1126/science.aba8310] [Citation(s) in RCA: 66] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 11/02/2020] [Accepted: 01/19/2021] [Indexed: 12/17/2022]
Abstract
The intestine is a site of direct encounter with the external environment and must consequently balance barrier defense with nutrient uptake. To investigate how nutrient uptake is regulated in the small intestine, we tested the effect of diets with different macronutrient compositions on epithelial gene expression. We found that enzymes and transporters required for carbohydrate digestion and absorption were regulated by carbohydrate availability. The "on-demand" induction of this machinery required γδ T cells, which regulated this program through the suppression of interleukin-22 production by type 3 innate lymphoid cells. Nutrient availability altered the tissue localization and transcriptome of γδ T cells. Additionally, transcriptional responses to diet involved cellular remodeling of the epithelial compartment. Thus, this work identifies a role for γδ T cells in nutrient sensing.
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Affiliation(s)
- Zuri A Sullivan
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | | | - Jaechul Lim
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Chris Smillie
- Klarman Cell Observatory, Broad Institute, Cambridge, MA, USA
| | - Moshe Biton
- Klarman Cell Observatory, Broad Institute, Cambridge, MA, USA
| | - Bernardo S Reis
- Laboratory of Mucosal Immunology, The Rockefeller University, New York, NY, USA
| | - Rachel K Zwick
- Program in Craniofacial Biology and Department of Orofacial Sciences, University of California, San Francisco, CA, USA
| | - Scott D Pope
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
- Howard Hughes Medical Institute, New Haven, CT, USA
| | - Kavita Israni-Winger
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Roham Parsa
- Laboratory of Mucosal Immunology, The Rockefeller University, New York, NY, USA
| | - Naomi H Philip
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Saleh Rashed
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Noah Palm
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
| | - Andrew Wang
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA
- Division of Rheumatology, Department of Medicine, Yale University School of Medicine, New Haven, CT, USA
| | - Daniel Mucida
- Laboratory of Mucosal Immunology, The Rockefeller University, New York, NY, USA
| | - Aviv Regev
- Klarman Cell Observatory, Broad Institute, Cambridge, MA, USA
- The David H. Koch Institute for Integrative Cancer Research at MIT, Department of Biology, Massachusetts Institute of Technology (MIT), Cambridge, MA, USA
- Howard Hughes Medical Institute, Cambridge, MA, USA
| | - Ruslan Medzhitov
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, USA.
- Howard Hughes Medical Institute, New Haven, CT, USA
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6
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Allen NC, Philip NH, Hui L, Zhou X, Franklin RA, Kong Y, Medzhitov R. Desynchronization of the molecular clock contributes to the heterogeneity of the inflammatory response. Sci Signal 2019; 12:12/571/eaau1851. [PMID: 30837303 DOI: 10.1126/scisignal.aau1851] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Heterogeneity in the behavior of genetically and developmentally equivalent cells is becoming increasingly appreciated. There are several sources of cellular heterogeneity, including both intrinsic and extrinsic noise. We found that some aspects of heterogeneity in the response of macrophages to bacterial lipopolysaccharide (LPS) were due to intercellular desynchronization of the molecular clock, a cell-intrinsic oscillator. We found that the ratio of the relative expression of two clock genes, Nfil3 and Dbp, expressed in opposite phases of the clock, determined the fraction of cells that produced the cytokine IL-12p40 in response to LPS. The clock can be entrained by various environmental stimuli, making it a mechanism by which population-level heterogeneity and the inflammatory response can be regulated.
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Affiliation(s)
- Nancy C Allen
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Naomi H Philip
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Lucy Hui
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Xu Zhou
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Ruth A Franklin
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Yong Kong
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06510, USA.,Department of Molecular Biophysics and Biochemistry, Yale University School of Medicine, New Haven, CT 06510, USA
| | - Ruslan Medzhitov
- Howard Hughes Medical Institute, Department of Immunobiology, Yale University School of Medicine, New Haven, CT 06510, USA.
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7
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Peterson LW, Philip NH, DeLaney A, Wynosky-Dolfi MA, Asklof K, Gray F, Choa R, Bjanes E, Buza EL, Hu B, Dillon CP, Green DR, Berger SB, Gough PJ, Bertin J, Brodsky IE. RIPK1-dependent apoptosis bypasses pathogen blockade of innate signaling to promote immune defense. J Exp Med 2017; 214:3171-3182. [PMID: 28855241 PMCID: PMC5679171 DOI: 10.1084/jem.20170347] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 07/19/2017] [Accepted: 08/17/2017] [Indexed: 12/11/2022] Open
Abstract
RIPK1 regulates cytokine signaling and cell death during infection and inflammation. Peterson et al. show that RIPK1 kinase activity triggers apoptosis in response to bacterial pathogen blockade of innate immune signaling and that this pathway of effector-triggered immunity is critical for a successful antibacterial response. Many pathogens deliver virulence factors or effectors into host cells in order to evade host defenses and establish infection. Although such effector proteins disrupt critical cellular signaling pathways, they also trigger specific antipathogen responses, a process termed “effector-triggered immunity.” The Gram-negative bacterial pathogen Yersinia inactivates critical proteins of the NF-κB and MAPK signaling cascade, thereby blocking inflammatory cytokine production but also inducing apoptosis. Yersinia-induced apoptosis requires the kinase activity of receptor-interacting protein kinase 1 (RIPK1), a key regulator of cell death, NF-κB, and MAPK signaling. Through the targeted disruption of RIPK1 kinase activity, which selectively disrupts RIPK1-dependent cell death, we now reveal that Yersinia-induced apoptosis is critical for host survival, containment of bacteria in granulomas, and control of bacterial burdens in vivo. We demonstrate that this apoptotic response provides a cell-extrinsic signal that promotes optimal innate immune cytokine production and antibacterial defense, demonstrating a novel role for RIPK1 kinase–induced apoptosis in mediating effector-triggered immunity to circumvent pathogen inhibition of immune signaling.
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Affiliation(s)
- Lance W Peterson
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA.,Institue for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Naomi H Philip
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA.,Institue for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Alexandra DeLaney
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA.,Institue for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Meghan A Wynosky-Dolfi
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA.,Institue for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Kendra Asklof
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA
| | - Falon Gray
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA
| | - Ruth Choa
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA.,Institue for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Elisabet Bjanes
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA.,Institue for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
| | - Elisabeth L Buza
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA
| | - Baofeng Hu
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA
| | | | - Douglas R Green
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN
| | - Scott B Berger
- Host Defense Discovery Performance Unit, Infectious Disease Therapy Area Unit, GlaxoSmithKline, Collegeville, PA
| | - Peter J Gough
- Host Defense Discovery Performance Unit, Infectious Disease Therapy Area Unit, GlaxoSmithKline, Collegeville, PA
| | - John Bertin
- Pattern Recognition Receptor Discovery Performance Unit, Immuno-Inflammation Therapeutic Area, GlaxoSmithKline, Collegeville, PA
| | - Igor E Brodsky
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA .,Institue for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA
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8
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Abstract
The innate immune system plays an essential role in initiating the early response against microbial infection, as well as instructing and shaping subsequent responses. Microbial pathogens are enormously diverse in terms of the niches they occupy, their metabolic properties and requirements, and the cellular pathways that they target. Nevertheless, innate sensing of pathogens triggers a relatively stereotyped set of responses that involve transcriptional induction of key inflammatory mediators, as well as post-translational assembly and activation of a multiprotein inflammatory complex termed 'the inflammasome.' Along with classical Pattern Recognition Receptors, the inflammasome activation pathway has emerged as a key regulator of tissue homeostasis and immune defense. Components of the inflammasome generally exist within the cell in a soluble, monomeric state, and oligomerize in response to diverse enzymatic activities associated with infection or cellular stress. Inflammasome assembly triggers activation of the pro-enzyme caspase-1, resulting in the cleavage of caspase-1 targets. The most extensively studied targets are the cytokines of the IL-1 family, but the recent discovery of Gasdermin D as a novel target of caspase-1 and the related inflammatory caspase, caspase-11, has begun to mechanistically define the links between caspase-1 activation and cell death. Cell death is a hallmark of macrophage infection by many pathogens, including the gram-negative bacterial pathogens of the genus Yersinia. Intriguingly, the activities of the Yersinia-secreted effector proteins and the type III secretion system (T3SS) itself have been linked to both inflammasome activation and evasion during infection. The balance between these activating and inhibitory activities shapes the outcome of Yersinia infection. Here, we describe the current state of knowledge on interactions between Yersinia and the inflammasome system, with the goal of integrating these findings within the general framework of inflammasome responses to microbial pathogens.
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Affiliation(s)
- Naomi H Philip
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA, 19104, USA.,Institute for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19104, USA.,Immunology Graduate Group, Philadelphia, PA, 19104, USA
| | - Erin E Zwack
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA, 19104, USA.,Cell and Molecular Biology Graduate Group, Philadelphia, PA, 19104, USA
| | - Igor E Brodsky
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA, 19104, USA. .,Institute for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, 19104, USA.
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Rauch I, Deets KA, Ji DX, von Moltke J, Tenthorey JL, Lee AY, Philip NH, Ayres JS, Brodsky IE, Gronert K, Vance RE. NAIP-NLRC4 Inflammasomes Coordinate Intestinal Epithelial Cell Expulsion with Eicosanoid and IL-18 Release via Activation of Caspase-1 and -8. Immunity 2017; 46:649-659. [PMID: 28410991 PMCID: PMC5476318 DOI: 10.1016/j.immuni.2017.03.016] [Citation(s) in RCA: 257] [Impact Index Per Article: 36.7] [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: 08/26/2016] [Revised: 12/09/2016] [Accepted: 03/24/2017] [Indexed: 11/25/2022]
Abstract
Intestinal epithelial cells (IECs) form a critical barrier against pathogen invasion. By generation of mice in which inflammasome expression is restricted to IECs, we describe a coordinated epithelium-intrinsic inflammasome response in vivo. This response was sufficient to protect against Salmonella tissue invasion and involved a previously reported IEC expulsion that was coordinated with lipid mediator and cytokine production and lytic IEC death. Excessive inflammasome activation in IECs was sufficient to result in diarrhea and pathology. Experiments with IEC organoids demonstrated that IEC expulsion did not require other cell types. IEC expulsion was accompanied by a major actin rearrangement in neighboring cells that maintained epithelium integrity but did not absolutely require Caspase-1 or Gasdermin D. Analysis of Casp1-/-Casp8-/- mice revealed a functional Caspase-8 inflammasome in vivo. Thus, a coordinated IEC-intrinsic, Caspase-1 and -8 inflammasome response plays a key role in intestinal immune defense and pathology.
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Affiliation(s)
- Isabella Rauch
- Division of Immunology & Pathogenesis, Department of Molecular & Cell Biology, University of California, Berkeley, CA 94720, USA
| | - Katherine A Deets
- Division of Immunology & Pathogenesis, Department of Molecular & Cell Biology, University of California, Berkeley, CA 94720, USA
| | - Daisy X Ji
- Division of Immunology & Pathogenesis, Department of Molecular & Cell Biology, University of California, Berkeley, CA 94720, USA
| | - Jakob von Moltke
- Division of Immunology & Pathogenesis, Department of Molecular & Cell Biology, University of California, Berkeley, CA 94720, USA
| | - Jeannette L Tenthorey
- Division of Immunology & Pathogenesis, Department of Molecular & Cell Biology, University of California, Berkeley, CA 94720, USA
| | - Angus Y Lee
- Cancer Research Laboratory and Immunotherapeutics and Vaccine Research Initiative, University of California, Berkeley, CA 94720, USA
| | - Naomi H Philip
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104, USA
| | - Janelle S Ayres
- Division of Immunology & Pathogenesis, Department of Molecular & Cell Biology, University of California, Berkeley, CA 94720, USA
| | - Igor E Brodsky
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104, USA
| | - Karsten Gronert
- Vision Science Program, School of Optometry, University of California at Berkeley, Berkeley, CA 94720, USA
| | - Russell E Vance
- Division of Immunology & Pathogenesis, Department of Molecular & Cell Biology, University of California, Berkeley, CA 94720, USA; Howard Hughes Medical Institute, University of California, Berkeley, CA 94720, USA; Cancer Research Laboratory and Immunotherapeutics and Vaccine Research Initiative, University of California, Berkeley, CA 94720, USA.
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10
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Philip NH, DeLaney A, Peterson LW, Santos-Marrero M, Grier JT, Sun Y, Wynosky-Dolfi MA, Zwack EE, Hu B, Olsen TM, Rongvaux A, Pope SD, López CB, Oberst A, Beiting DP, Henao-Mejia J, Brodsky IE. Activity of Uncleaved Caspase-8 Controls Anti-bacterial Immune Defense and TLR-Induced Cytokine Production Independent of Cell Death. PLoS Pathog 2016; 12:e1005910. [PMID: 27737018 PMCID: PMC5063320 DOI: 10.1371/journal.ppat.1005910] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Accepted: 09/01/2016] [Indexed: 12/29/2022] Open
Abstract
Caspases regulate cell death programs in response to environmental stresses, including infection and inflammation, and are therefore critical for the proper operation of the mammalian immune system. Caspase-8 is necessary for optimal production of inflammatory cytokines and host defense against infection by multiple pathogens including Yersinia, but whether this is due to death of infected cells or an intrinsic role of caspase-8 in TLR-induced gene expression is unknown. Caspase-8 activation at death signaling complexes results in its autoprocessing and subsequent cleavage and activation of its downstream apoptotic targets. Whether caspase-8 activity is also important for inflammatory gene expression during bacterial infection has not been investigated. Here, we report that caspase-8 plays an essential cell-intrinsic role in innate inflammatory cytokine production in vivo during Yersinia infection. Unexpectedly, we found that caspase-8 enzymatic activity regulates gene expression in response to bacterial infection as well as TLR signaling independently of apoptosis. Using newly-generated mice in which caspase-8 autoprocessing is ablated (Casp8DA/DA), we now demonstrate that caspase-8 enzymatic activity, but not autoprocessing, mediates induction of inflammatory cytokines by bacterial infection and a wide variety of TLR stimuli. Because unprocessed caspase-8 functions in an enzymatic complex with its homolog cFLIP, our findings implicate the caspase-8/cFLIP heterodimer in control of inflammatory cytokines during microbial infection, and provide new insight into regulation of antibacterial immune defense. TLR signaling induces expression of key inflammatory cytokines and pro-survival factors that facilitate control of microbial infection. TLR signaling can also engage cell death pathways through activation of enzymes known as caspases. Caspase-8 activates apoptosis in response to infection by pathogens that interfere with NF-κB signaling, including Yersinia, but has also recently been linked to control of inflammatory gene expression. Pathogenic Yersinia can cause severe disease ranging from gastroenteritis to plague. While caspase-8 mediates cell death in response to Yersinia infection as well as other signals, its precise role in gene expression and host defense during in vivo infection is unknown. Here, we show that caspase-8 activity promotes cell-intrinsic cytokine expression, independent of its role in cell death in response to Yersinia infection. Our studies further demonstrate that caspase-8 enzymatic activity plays a previously undescribed role in ensuring optimal TLR-induced gene expression by innate cells during bacterial infection. This work sheds new light on mechanisms that regulate essential innate anti-bacterial immune defense.
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Affiliation(s)
- Naomi H. Philip
- University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania, United States of America
- University of Pennsylvania Perelman School of Medicine, Institute for Immunology, Philadelphia, Pennsylvania, United States of America
| | - Alexandra DeLaney
- University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania, United States of America
| | - Lance W. Peterson
- University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania, United States of America
- University of Pennsylvania Perelman School of Medicine, Institute for Immunology, Philadelphia, Pennsylvania, United States of America
| | - Melanie Santos-Marrero
- University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania, United States of America
- University of Pennsylvania Perelman School of Medicine, Institute for Immunology, Philadelphia, Pennsylvania, United States of America
| | - Jennifer T. Grier
- University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania, United States of America
| | - Yan Sun
- University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania, United States of America
| | - Meghan A. Wynosky-Dolfi
- University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania, United States of America
| | - Erin E. Zwack
- University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania, United States of America
| | - Baofeng Hu
- University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania, United States of America
| | - Tayla M. Olsen
- University of Washington, Department of Immunology, Seattle, Washington, United States of America
| | - Anthony Rongvaux
- Fred Hutchinson Cancer Research Center, Clinical Research Division and Program in Immunology, Seattle, Washington, United States of America
| | - Scott D. Pope
- Yale University School of Medicine, Department of Immunobiology, New Haven, Connecticut, United States of America
| | - Carolina B. López
- University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania, United States of America
- University of Pennsylvania Perelman School of Medicine, Institute for Immunology, Philadelphia, Pennsylvania, United States of America
| | - Andrew Oberst
- University of Washington, Department of Immunology, Seattle, Washington, United States of America
| | - Daniel P. Beiting
- University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania, United States of America
- University of Pennsylvania Perelman School of Medicine, Institute for Immunology, Philadelphia, Pennsylvania, United States of America
| | - Jorge Henao-Mejia
- University of Pennsylvania Perelman School of Medicine, Institute for Immunology, Philadelphia, Pennsylvania, United States of America
- Department of Pathology and Laboratory Medicine, Perelman School of Medicine at the University of Pennsylvania and Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Igor E. Brodsky
- University of Pennsylvania School of Veterinary Medicine, Department of Pathobiology, Philadelphia, Pennsylvania, United States of America
- University of Pennsylvania Perelman School of Medicine, Institute for Immunology, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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11
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Peterson LW, Philip NH, Dillon CP, Bertin J, Gough PJ, Green DR, Brodsky IE. Cell-Extrinsic TNF Collaborates with TRIF Signaling To Promote Yersinia-Induced Apoptosis. J Immunol 2016; 197:4110-4117. [PMID: 27733552 DOI: 10.4049/jimmunol.1601294] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Accepted: 09/20/2016] [Indexed: 02/02/2023]
Abstract
Innate immune responses that are crucial for control of infection are often targeted by microbial pathogens. Blockade of NF-κB and MAPK signaling by the Yersinia virulence factor YopJ inhibits cytokine production by innate immune cells but also triggers cell death. This cell death requires RIPK1 kinase activity and caspase-8, which are engaged by TLR4 and the adaptor protein TRIF. Nevertheless, TLR4- and TRIF-deficient cells undergo significant apoptosis, implicating TLR4/TRIF-independent pathways in the death of Yersinia-infected cells. In this article, we report a key role for TNF/TNFR1 in Yersinia-induced cell death of murine macrophages, which occurs despite the blockade of NF-κB and MAPK signaling imposed by Yersinia on infected cells. Intriguingly, direct analysis of YopJ injection revealed a heterogeneous population of injection-high and injection-low cells, and demonstrated that TNF expression came from the injection-low population. Moreover, TNF production by this subpopulation was necessary for maximal apoptosis in the population of highly injected cells, and TNFR-deficient mice displayed enhanced susceptibility to Yersinia infection. These data demonstrate an important role for collaboration between TNF and pattern recognition receptor signals in promoting maximal apoptosis during bacterial infection, and demonstrate that heterogeneity in virulence factor injection and cellular responses play an important role in promoting anti-Yersinia immune defense.
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Affiliation(s)
- Lance W Peterson
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104.,Institute for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104
| | - Naomi H Philip
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104.,Institute for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104
| | - Christopher P Dillon
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105; and
| | - John Bertin
- Pattern Recognition Receptor Discovery Performance Unit, Immuno-Inflammation Therapeutic Area, GlaxoSmithKline, Collegeville, PA 19422
| | - Peter J Gough
- Pattern Recognition Receptor Discovery Performance Unit, Immuno-Inflammation Therapeutic Area, GlaxoSmithKline, Collegeville, PA 19422
| | - Douglas R Green
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105; and
| | - Igor E Brodsky
- Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, Philadelphia, PA 19104; .,Institute for Immunology, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA 19104
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12
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Rosadini CV, Zanoni I, Odendall C, Green ER, Paczosa MK, Philip NH, Brodsky IE, Mecsas J, Kagan JC. A Single Bacterial Immune Evasion Strategy Dismantles Both MyD88 and TRIF Signaling Pathways Downstream of TLR4. Cell Host Microbe 2016; 18:682-93. [PMID: 26651944 DOI: 10.1016/j.chom.2015.11.006] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Revised: 09/09/2015] [Accepted: 11/17/2015] [Indexed: 01/10/2023]
Abstract
During bacterial infections, Toll-like receptor 4 (TLR4) signals through the MyD88- and TRIF-dependent pathways to promote pro-inflammatory and interferon (IFN) responses, respectively. Bacteria can inhibit the MyD88 pathway, but if the TRIF pathway is also targeted is unclear. We demonstrate that, in addition to MyD88, Yersinia pseudotuberculosis inhibits TRIF signaling through the type III secretion system effector YopJ. Suppression of TRIF signaling occurs during dendritic cell (DC) and macrophage infection and prevents expression of type I IFN and pro-inflammatory cytokines. YopJ-mediated inhibition of TRIF prevents DCs from inducing natural killer (NK) cell production of antibacterial IFNγ. During infection of DCs, YopJ potently inhibits MAPK pathways but does not prevent activation of IKK- or TBK1-dependent pathways. This singular YopJ activity efficiently inhibits TLR4 transcription-inducing activities, thus illustrating a simple means by which pathogens impede innate immunity.
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Affiliation(s)
- Charles V Rosadini
- Harvard Medical School and Division of Gastroenterology, Boston Children's Hospital, Boston, MA 02115, USA
| | - Ivan Zanoni
- Harvard Medical School and Division of Gastroenterology, Boston Children's Hospital, Boston, MA 02115, USA; Department of Biotechnology and Biosciences, University of Milano-Bicocca, Milan 20126, Italy; Unit of Cell Signalling and Innate Immunity, Humanitas Clinical and Research Center, Rozzano 20089, Italy
| | - Charlotte Odendall
- Harvard Medical School and Division of Gastroenterology, Boston Children's Hospital, Boston, MA 02115, USA
| | - Erin R Green
- Graduate Program in Molecular Microbiology, Sackler School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA
| | - Michelle K Paczosa
- Graduate Program in Immunology, Sackler School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA
| | - Naomi H Philip
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Igor E Brodsky
- Department of Pathobiology, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Joan Mecsas
- Graduate Program in Molecular Microbiology, Sackler School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA; Graduate Program in Immunology, Sackler School of Biomedical Sciences, Tufts University School of Medicine, Boston, MA 02111, USA
| | - Jonathan C Kagan
- Harvard Medical School and Division of Gastroenterology, Boston Children's Hospital, Boston, MA 02115, USA.
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Wynosky-Dolfi MA, Snyder AG, Philip NH, Doonan PJ, Poffenberger MC, Avizonis D, Zwack EE, Riblett AM, Hu B, Strowig T, Flavell RA, Jones RG, Freedman BD, Brodsky IE. Oxidative metabolism enables Salmonella evasion of the NLRP3 inflammasome. ACTA ACUST UNITED AC 2014; 211:653-68. [PMID: 24638169 PMCID: PMC3978275 DOI: 10.1084/jem.20130627] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Salmonella lacking the TCA enzyme aconitase trigger NLRP3 inflammasome activation in infected macrophages, leading to elevated inflammatory responses and reduced virulence. Microbial infection triggers assembly of inflammasome complexes that promote caspase-1–dependent antimicrobial responses. Inflammasome assembly is mediated by members of the nucleotide binding domain leucine-rich repeat (NLR) protein family that respond to cytosolic bacterial products or disruption of cellular processes. Flagellin injected into host cells by invading Salmonella induces inflammasome activation through NLRC4, whereas NLRP3 is required for inflammasome activation in response to multiple stimuli, including microbial infection, tissue damage, and metabolic dysregulation, through mechanisms that remain poorly understood. During systemic infection, Salmonella avoids NLRC4 inflammasome activation by down-regulating flagellin expression. Macrophages exhibit delayed NLRP3 inflammasome activation after Salmonella infection, suggesting that Salmonella may evade or prevent the rapid activation of the NLRP3 inflammasome. We therefore screened a Salmonella Typhimurium transposon library to identify bacterial factors that limit NLRP3 inflammasome activation. Surprisingly, absence of the Salmonella TCA enzyme aconitase induced rapid NLRP3 inflammasome activation. This inflammasome activation correlated with elevated levels of bacterial citrate, and required mitochondrial reactive oxygen species and bacterial citrate synthase. Importantly, Salmonella lacking aconitase displayed NLRP3- and caspase-1/11–dependent attenuation of virulence, and induced elevated serum IL-18 in wild-type mice. Together, our data link Salmonella genes controlling oxidative metabolism to inflammasome activation and suggest that NLRP3 inflammasome evasion promotes systemic Salmonella virulence.
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Affiliation(s)
- Meghan A Wynosky-Dolfi
- Department of Pathobiology, School of Veterinary Medicine; and 2 Immunology Graduate Group and 3 Cell and Molecular Biology Graduate Group, University of Pennsylvania, Kennett Square, PA 19104
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14
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Abstract
Mammalian barrier surfaces, including the skin, lung and intestine, are constantly exposed to environmental stimuli, including beneficial and pathogenic microbes, dietary substances and non-organic materials. At these anatomical sites it is essential to maintain barrier integrity to promote tissue homeostasis and prevent local and systemic inflammation. As such, changes in the composition and localization of commensal bacteria are closely associated with inflammatory, metabolic and infectious disease in mammals. Cells of the innate and adaptive immune systems have a crucial role in the tight regulation of host-commensal relationships. A recently described family of immune cells, termed innate lymphoid cells (ILCs), contributes to inflammation, modulates adaptive immunity and regulates wound healing and tissue regeneration. ILCs are present at barrier surfaces, and thus are in close proximity to environmental antigens, including commensal bacteria. The composition and localization of microbial communities have a profound impact on immunity at barrier surfaces as well as at distant sites. This review will summarize the phenotypic characteristics of ILC family members and discuss recent findings about the interactions between ILCs and the microbiota in the contexts of homeostasis, immunity, inflammation and tissue organization and repair.
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Affiliation(s)
- Naomi H Philip
- Department of Microbiology and Institute for Immunology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104-6160, USA
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15
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Abstract
Cell death plays a central role in host-pathogen interactions, as it can eliminate the pathogen's replicative niche and provide pro-inflammatory signals necessary for an effective immune response; conversely, cell death can allow pathogens to eliminate immune cells and evade anti-microbial effector mechanisms. In response to developmental signals or cell-intrinsic stresses, the executioner caspases-3 and -7 mediate apoptotic cell death, which is generally viewed as immunologically silent or immunosuppressive. A proinflammatory form of cell death that requires caspase-1, termed pyroptosis, is activated in response to microbial products within the host cytosol or disruption of cellular membranes by microbial pathogens. Infection by the bacterial pathogen Yersinia has features of both apoptosis and pyroptosis. Cell death and caspase-1 processing in Yersinia-infected cells occur in response to inhibition of NF-κB and MAPK signaling by the Yersinia virulence factor YopJ. However, the molecular basis of YopJ-induced cell death, and the role of different death pathways in anti-Yersinia immune responses remain enigmatic. Here, we discuss the role that cell death may play in inducing specific pro-inflammatory signals that shape innate and adaptive immune responses against Yersinia infection.
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Affiliation(s)
- Naomi H Philip
- Immunology Graduate Group, School of Veterinary Medicine, University of Pennsylvania Philadelphia, PA, USA ; Department of Pathobiology, University of Pennsylvania Philadelphia, PA, USA
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Sandhu DP, Iacovou JW, Fletcher MS, Kaisary AV, Philip NH, Arkell DG. A comparison of intramuscular ketorolac and pethidine in the alleviation of renal colic. Br J Urol 1994; 74:690-3. [PMID: 7827834 DOI: 10.1111/j.1464-410x.1994.tb07107.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
OBJECTIVE To compare the analgesic efficacy of a single 30 mg intramuscular dose of ketorolac with that of intramuscular pethidine 100 mg, in a double-blind, parallel-group investigation of patients presenting with pain suggestive of renal colic. PATIENTS AND METHODS Seventy-six patients (17 women, 15 men; mean age 45.2 years, range 20-80) were allocated by means of a pre-determined randomization schedule to receive ketorolac and 78 patients (20 women, 58 men; mean age 42.1, years range 18-70) to receive pethidine. Data from eight patients in the ketorolac group and six in the pethidine group were excluded from the efficacy analyses because of protocol violations. The severity of each patient's pain was assessed on a four-point verbal rating scale (VRS) and a 10 cm visual analogue scale at pre-dose and at 15 min intervals for the first hour post dosing. The time to first administration of rescue analgesic, up to 24 h following dosing with the study medication, was recorded. Adverse events were elicited by general questioning. RESULTS Eighty-eight per cent of patients in each treatment group had improved according to the VRS of pain severity 1 h after dosing; the summed pain intensity differences up to 1 h were statistically significantly different in favour of ketorolac (P < 0.05). Fifty-six per cent of patients who were receiving ketorolac required rescue analgesia during the study period compared with 74% receiving pethidine. The incidences of adverse events were lower in the ketorolac group (28%) than the pethidine group (51%). CONCLUSION Ketorolac can be considered a viable alternative to pethidine for the treatment of renal colic.
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