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Farrell B, Alam N, Hart MN, Jamwal A, Ragotte RJ, Walters-Morgan H, Draper SJ, Knuepfer E, Higgins MK. The PfRCR complex bridges malaria parasite and erythrocyte during invasion. Nature 2024; 625:578-584. [PMID: 38123677 PMCID: PMC10794152 DOI: 10.1038/s41586-023-06856-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Accepted: 11/09/2023] [Indexed: 12/23/2023]
Abstract
The symptoms of malaria occur during the blood stage of infection, when parasites invade and replicate within human erythrocytes. The PfPCRCR complex1, containing PfRH5 (refs. 2,3), PfCyRPA, PfRIPR, PfCSS and PfPTRAMP, is essential for erythrocyte invasion by the deadliest human malaria parasite, Plasmodium falciparum. Invasion can be prevented by antibodies3-6 or nanobodies1 against each of these conserved proteins, making them the leading blood-stage malaria vaccine candidates. However, little is known about how PfPCRCR functions during invasion. Here we present the structure of the PfRCR complex7,8, containing PfRH5, PfCyRPA and PfRIPR, determined by cryogenic-electron microscopy. We test the hypothesis that PfRH5 opens to insert into the membrane9, instead showing that a rigid, disulfide-locked PfRH5 can mediate efficient erythrocyte invasion. We show, through modelling and an erythrocyte-binding assay, that PfCyRPA-binding antibodies5 neutralize invasion through a steric mechanism. We determine the structure of PfRIPR, showing that it consists of an ordered, multidomain core flexibly linked to an elongated tail. We also show that the elongated tail of PfRIPR, which is the target of growth-neutralizing antibodies6, binds to the PfCSS-PfPTRAMP complex on the parasite membrane. A modular PfRIPR is therefore linked to the merozoite membrane through an elongated tail, and its structured core presents PfCyRPA and PfRH5 to interact with erythrocyte receptors. This provides fresh insight into the molecular mechanism of erythrocyte invasion and opens the way to new approaches in rational vaccine design.
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Affiliation(s)
- Brendan Farrell
- Department of Biochemistry, University of Oxford, Oxford, UK
- Kavli Institute for Nanoscience Discovery, University of Oxford, Oxford, UK
| | - Nawsad Alam
- Department of Biochemistry, University of Oxford, Oxford, UK
- Kavli Institute for Nanoscience Discovery, University of Oxford, Oxford, UK
| | | | - Abhishek Jamwal
- Department of Biochemistry, University of Oxford, Oxford, UK
- Kavli Institute for Nanoscience Discovery, University of Oxford, Oxford, UK
| | - Robert J Ragotte
- Department of Biochemistry, University of Oxford, Oxford, UK
- Kavli Institute for Nanoscience Discovery, University of Oxford, Oxford, UK
| | - Hannah Walters-Morgan
- Department of Biochemistry, University of Oxford, Oxford, UK
- Kavli Institute for Nanoscience Discovery, University of Oxford, Oxford, UK
| | - Simon J Draper
- Department of Biochemistry, University of Oxford, Oxford, UK
- Kavli Institute for Nanoscience Discovery, University of Oxford, Oxford, UK
| | | | - Matthew K Higgins
- Department of Biochemistry, University of Oxford, Oxford, UK.
- Kavli Institute for Nanoscience Discovery, University of Oxford, Oxford, UK.
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2
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Xia S, Chen Z, Shen C, Fu TM. Higher-order assemblies in immune signaling: supramolecular complexes and phase separation. Protein Cell 2021; 12:680-694. [PMID: 33835418 PMCID: PMC8403095 DOI: 10.1007/s13238-021-00839-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 03/01/2021] [Indexed: 12/31/2022] Open
Abstract
Signaling pathways in innate and adaptive immunity play vital roles in pathogen recognition and the functions of immune cells. Higher-order assemblies have recently emerged as a central principle that governs immune signaling and, by extension, cellular communication in general. There are mainly two types of higher-order assemblies: 1) ordered, solid-like large supramolecular complexes formed by stable and rigid protein-protein interactions, and 2) liquid-like phase-separated condensates formed by weaker and more dynamic intermolecular interactions. This review covers key examples of both types of higher-order assemblies in major immune pathways. By placing emphasis on the molecular structures of the examples provided, we discuss how their structural organization enables elegant mechanisms of signaling regulation.
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MESH Headings
- Adaptive Immunity
- Animals
- DEAD Box Protein 58/genetics
- DEAD Box Protein 58/immunology
- DEAD Box Protein 58/metabolism
- DEAD-box RNA Helicases/genetics
- DEAD-box RNA Helicases/immunology
- DEAD-box RNA Helicases/metabolism
- Gene Expression Regulation
- Humans
- Immunity, Innate
- Inflammasomes/genetics
- Inflammasomes/immunology
- Inflammasomes/ultrastructure
- Models, Molecular
- Multiprotein Complexes/genetics
- Multiprotein Complexes/immunology
- Multiprotein Complexes/metabolism
- Protein Conformation
- Protein Interaction Mapping
- Receptors, Antigen, B-Cell/genetics
- Receptors, Antigen, B-Cell/immunology
- Receptors, Antigen, B-Cell/metabolism
- Receptors, Antigen, T-Cell/genetics
- Receptors, Antigen, T-Cell/immunology
- Receptors, Antigen, T-Cell/metabolism
- Receptors, Immunologic/genetics
- Receptors, Immunologic/immunology
- Receptors, Immunologic/metabolism
- Receptors, Tumor Necrosis Factor, Type I/genetics
- Receptors, Tumor Necrosis Factor, Type I/immunology
- Receptors, Tumor Necrosis Factor, Type I/metabolism
- Signal Transduction/immunology
- Toll-Like Receptors/genetics
- Toll-Like Receptors/immunology
- Toll-Like Receptors/metabolism
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Affiliation(s)
- Shiyu Xia
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, and Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA, 02115, USA
| | - Zhenhang Chen
- Department of Biological Chemistry and Pharmacology, The Ohio State University, Columbus, OH, 43210, USA
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, 43210, USA
| | - Chen Shen
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, and Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA, 02115, USA
| | - Tian-Min Fu
- Department of Biological Chemistry and Pharmacology, The Ohio State University, Columbus, OH, 43210, USA.
- The Ohio State University Comprehensive Cancer Center, Columbus, OH, 43210, USA.
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3
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Liu W, Maben Z, Wang C, Lindquist KC, Li M, Rayannavar V, Lopez Armenta I, Nager A, Pascua E, Dominik PK, Oyen D, Wang H, Roach RC, Allan CM, Mosyak L, Chaparro-Riggers J. Structural delineation and phase-dependent activation of the costimulatory CD27:CD70 complex. J Biol Chem 2021; 297:101102. [PMID: 34419446 PMCID: PMC8484739 DOI: 10.1016/j.jbc.2021.101102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 03/15/2021] [Revised: 08/16/2021] [Accepted: 08/18/2021] [Indexed: 11/17/2022] Open
Abstract
CD27 is a tumor necrosis factor (TNF) receptor, which stimulates lymphocytes and promotes their differentiation upon activation by TNF ligand CD70. Activation of the CD27 receptor provides a costimulatory signal to promote T cell, B cell, and NK cell activity to facilitate antitumor and anti-infection immunity. Aberrant increased and focused expression of CD70 on many tumor cells renders CD70 an attractive therapeutic target for direct tumor killing. However, despite their use as drug targets to treat cancers, the molecular basis and atomic details of CD27 and CD70 interaction remain elusive. Here we report the crystal structure of human CD27 in complex with human CD70. Analysis of our structure shows that CD70 adopts a classical TNF ligand homotrimeric assembly to engage CD27 receptors in a 3:3 stoichiometry. By combining structural and rational mutagenesis data with reported disease-correlated mutations, we identified the key amino acid residues of CD27 and CD70 that control this interaction. We also report increased potency for plate-bound CD70 constructs compared with solution-phase ligand in a functional activity to stimulate T-cells in vitro. These findings offer new mechanistic insight into this critical costimulatory interaction.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | - Hui Wang
- Pfizer, Inc, La Jolla, California, USA
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4
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Baranova SV, Dmitrienok PS, Buneva VN, Nevinsky GA. HIV-Infected Patients: Cross Site-Specific Hydrolysis of H2a and H2b Histones and Myelin Basic Protein with Antibodies against These Three Proteins. Biomolecules 2020; 10:E1501. [PMID: 33143355 PMCID: PMC7693679 DOI: 10.3390/biom10111501] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Revised: 10/05/2020] [Accepted: 10/27/2020] [Indexed: 01/28/2023] Open
Abstract
Anti-DNA antibodies are usually produced against histone-DNA complexes appearing during cell apoptosis, while histones are known as damage-associated molecules. A myelin sheath of axons contains myelin basic protein (MBP) playing an important role in the pathogenesis of autoimmune diseases. Antibodies with enzymatic activities (abzymes) are distinctive features of some autoimmune and viral diseases. Abzymes against different proteins can usually only hydrolyze these specific proteins. Using sequential chromatographies of homogeneous IgG preparations from sera of HIV-infected patients on columns with immobilized MBP, H2a, and H2b histones, the anti-MBP, anti-H2a, and anti-H2b antibodies were obtained. It was first shown that IgGs against H2a and H2b effectively hydrolyze these histones and MBP, while anti-MBP split MBP, H2a, and H2b, but no other control proteins. Using the MALDI mass spectrometry, the cleavage sites of H2a, H2b, and MBP by abzymes against these three proteins were found. Among 14 sites of hydrolysis of H2a by IgGs against H2a and 10 sites by anti-MBP IgGs, only one site of hydrolysis was the same for these abzymes. Eleven cleavage sites of H2b with IgGs against H2b and 10 sites of its hydrolysis with antibodies against MBP were different. Anti-H2a, anti-H2b, and anti-MBP abzymes are unpredictable examples of IgGs possessing not only cross-complexation but also catalytic cross-reactivity, which may be a common phenomenon for such abzymes in patients with different autoimmune diseases. The existence of cross-reactivity of abzymes against H2a and H2b histones and MBP represent a great danger to humans since, in contrast with MBP, histones due to cell apoptosis constantly occur in human blood. Anti-H2a, anti-H2b, and anti-MBP can attack and hydrolyze myelin basic protein of the myelin sheath of axons and plays a negative role in the pathogenesis of several pathologies.
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Affiliation(s)
- Svetlana V. Baranova
- Institute of Chemical Biology and Fundamental Medicine, Siberian Division of Russian Academy of Sciences, 630090 Lavrentiev, Russia; (S.V.B.); (V.N.B.)
| | - Pavel S. Dmitrienok
- Pacific Institute of Bioorganic Chemistry, Far East Division, Russian Academy of Sciences, 690022 Vladivostok, Russia;
| | - Valentina N. Buneva
- Institute of Chemical Biology and Fundamental Medicine, Siberian Division of Russian Academy of Sciences, 630090 Lavrentiev, Russia; (S.V.B.); (V.N.B.)
| | - Georgy A. Nevinsky
- Institute of Chemical Biology and Fundamental Medicine, Siberian Division of Russian Academy of Sciences, 630090 Lavrentiev, Russia; (S.V.B.); (V.N.B.)
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5
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Lajoie JM, Cho YK, Frost D, Bremner S, Li L, Shusta EV. A yeast display immunoprecipitation screen for targeted discovery of antibodies against membrane protein complexes. Protein Eng Des Sel 2019; 32:219-230. [PMID: 31769480 PMCID: PMC7017056 DOI: 10.1093/protein/gzz035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 07/26/2019] [Accepted: 08/01/2019] [Indexed: 11/12/2022] Open
Abstract
Yeast display immunoprecipitation is a combinatorial library screening platform for the discovery and engineering of antibodies against membrane proteins using detergent-solubilized membrane fractions or cell lysates as antigen sources. Here, we present the extension of this method for the screening of antibodies that bind to membrane protein complexes, enabling discovery of antibodies that target antigens involved in a functional protein-protein interaction of interest. For this proof-of-concept study, we focused on the receptor-mediated endocytosis machinery at the blood-brain barrier, and adaptin 2 (AP-2) was chosen as the functional interaction hub. The goal of this study was to identify antibodies that bound to blood-brain barrier (BBB) membrane protein complexes containing AP-2. Screening of a nonimmune yeast display antibody library was carried out using detergent-solubilized BBB plasma membranes as an antigen pool, and antibodies that could interact with protein complexes containing AP-2 were identified. Downstream characterization of isolated antibodies confirmed targeting of proteins known to play important roles in membrane trafficking. This functional yeast display immunoprecipitation screen may be applied to other systems where antibodies against other functional classes of protein complexes are sought.
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Affiliation(s)
- Jason M Lajoie
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, WI 53706, USA
| | - Yong Ku Cho
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, WI 53706, USA
- Department of Chemical and Biomolecular Engineering, University of Connecticut, 191 Auditorium Road, Storrs, CT 06269, USA
| | - Dustin Frost
- School of Pharmacy, Department of Pharmaceutical Sciences, University of Wisconsin-Madison, 777 Highland Ave., Madison, WI 53705, USA
| | - Samantha Bremner
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, WI 53706, USA
| | - Lingjun Li
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Ave., Madison, WI 53706, USA
- Department of Chemical and Biomolecular Engineering, University of Connecticut, 191 Auditorium Road, Storrs, CT 06269, USA
| | - Eric V Shusta
- Department of Chemical and Biological Engineering, University of Wisconsin-Madison, 1415 Engineering Dr., Madison, WI 53706, USA
- Department of Neurological Surgery, University of Wisconsin-Madison, 600 Highland Ave., Madison, WI 53792, USA
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6
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Liu Y, Cuendet MA, Goffin L, Šachl R, Cebecauer M, Cariolato L, Guillaume P, Reichenbach P, Irving M, Coukos G, Luescher IF. CD8 Binding of MHC-Peptide Complexes in cis or trans Regulates CD8 + T-cell Responses. J Mol Biol 2019; 431:4941-4958. [PMID: 31704286 DOI: 10.1016/j.jmb.2019.10.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 10/21/2019] [Accepted: 10/23/2019] [Indexed: 11/19/2022]
Abstract
The coreceptor CD8αβ can greatly promote activation of T cells by strengthening T-cell receptor (TCR) binding to cognate peptide-MHC complexes (pMHC) on antigen presenting cells and by bringing p56Lck to TCR/CD3. Here, we demonstrate that CD8 can also bind to pMHC on the T cell (in cis) and that this inhibits their activation. Using molecular modeling, fluorescence resonance energy transfer experiments on living cells, biochemical and mutational analysis, we show that CD8 binding to pMHC in cis involves a different docking mode and is regulated by posttranslational modifications including a membrane-distal interchain disulfide bond and negatively charged O-linked glycans near positively charged sequences on the CD8β stalk. These modifications distort the stalk, thus favoring CD8 binding to pMHC in cis. Differential binding of CD8 to pMHC in cis or trans is a means to regulate CD8+ T-cell responses and provides new translational opportunities.
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Affiliation(s)
- Yang Liu
- Ludwig Institute for Cancer Research, University of Lausanne, and Department of Oncology, University Hospital of Lausanne, 1009, Lausanne, Switzerland
| | - Michel A Cuendet
- Ludwig Institute for Cancer Research, University of Lausanne, and Department of Oncology, University Hospital of Lausanne, 1009, Lausanne, Switzerland; Swiss Institute of Bioinformatics, 1015 Lausanne, Switzerland; Department of Physiology and Biophysics, Weill Cornell Medicine, New York, USA
| | - Laurence Goffin
- Ludwig Institute for Cancer Research, University of Lausanne, and Department of Oncology, University Hospital of Lausanne, 1009, Lausanne, Switzerland
| | - Radek Šachl
- Department of Biophysical Chemistry, J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences, 18223 Prague, Czech Republic
| | - Marek Cebecauer
- Department of Biophysical Chemistry, J. Heyrovsky Institute of Physical Chemistry of the Czech Academy of Sciences, 18223 Prague, Czech Republic
| | - Luca Cariolato
- Ludwig Institute for Cancer Research, University of Lausanne, and Department of Oncology, University Hospital of Lausanne, 1009, Lausanne, Switzerland
| | - Philippe Guillaume
- Ludwig Institute for Cancer Research, University of Lausanne, and Department of Oncology, University Hospital of Lausanne, 1009, Lausanne, Switzerland
| | - Patrick Reichenbach
- Ludwig Institute for Cancer Research, University of Lausanne, and Department of Oncology, University Hospital of Lausanne, 1009, Lausanne, Switzerland
| | - Melita Irving
- Ludwig Institute for Cancer Research, University of Lausanne, and Department of Oncology, University Hospital of Lausanne, 1009, Lausanne, Switzerland
| | - George Coukos
- Ludwig Institute for Cancer Research, University of Lausanne, and Department of Oncology, University Hospital of Lausanne, 1009, Lausanne, Switzerland
| | - Immanuel F Luescher
- Ludwig Institute for Cancer Research, University of Lausanne, and Department of Oncology, University Hospital of Lausanne, 1009, Lausanne, Switzerland.
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7
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Abella JR, Antunes DA, Clementi C, Kavraki LE. APE-Gen: A Fast Method for Generating Ensembles of Bound Peptide-MHC Conformations. Molecules 2019; 24:E881. [PMID: 30832312 PMCID: PMC6429480 DOI: 10.3390/molecules24050881] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [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: 01/15/2019] [Revised: 02/26/2019] [Accepted: 02/27/2019] [Indexed: 11/16/2022] Open
Abstract
The Class I Major Histocompatibility Complex (MHC) is a central protein in immunology as it binds to intracellular peptides and displays them at the cell surface for recognition by T-cells. The structural analysis of bound peptide-MHC complexes (pMHCs) holds the promise of interpretable and general binding prediction (i.e., testing whether a given peptide binds to a given MHC). However, structural analysis is limited in part by the difficulty in modelling pMHCs given the size and flexibility of the peptides that can be presented by MHCs. This article describes APE-Gen (Anchored Peptide-MHC Ensemble Generator), a fast method for generating ensembles of bound pMHC conformations. APE-Gen generates an ensemble of bound conformations by iterated rounds of (i) anchoring the ends of a given peptide near known pockets in the binding site of the MHC, (ii) sampling peptide backbone conformations with loop modelling, and then (iii) performing energy minimization to fix steric clashes, accumulating conformations at each round. APE-Gen takes only minutes on a standard desktop to generate tens of bound conformations, and we show the ability of APE-Gen to sample conformations found in X-ray crystallography even when only sequence information is used as input. APE-Gen has the potential to be useful for its scalability (i.e., modelling thousands of pMHCs or even non-canonical longer peptides) and for its use as a flexible search tool. We demonstrate an example for studying cross-reactivity.
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Affiliation(s)
- Jayvee R Abella
- Department of Computer Science, Rice University, Houston, TX 77005, USA.
| | - Dinler A Antunes
- Department of Computer Science, Rice University, Houston, TX 77005, USA.
| | - Cecilia Clementi
- Center for Theoretical Biological Physics, Rice University, Houston, TX 77005, USA.
- Department of Chemistry, Rice University, Houston, TX 77005, USA.
| | - Lydia E Kavraki
- Department of Computer Science, Rice University, Houston, TX 77005, USA.
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8
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Ma Y, Guo H, Hu L, Martinez PP, Moschou PN, Cevik V, Ding P, Duxbury Z, Sarris PF, Jones JDG. Distinct modes of derepression of an Arabidopsis immune receptor complex by two different bacterial effectors. Proc Natl Acad Sci U S A 2018; 115:10218-10227. [PMID: 30254172 PMCID: PMC6187137 DOI: 10.1073/pnas.1811858115] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [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: 01/01/2023] Open
Abstract
Plant intracellular nucleotide-binding leucine-rich repeat (NLR) immune receptors often function in pairs to detect pathogen effectors and activate defense. The Arabidopsis RRS1-R-RPS4 NLR pair recognizes the bacterial effectors AvrRps4 and PopP2 via an integrated WRKY transcription factor domain in RRS1-R that mimics the effector's authentic targets. How the complex activates defense upon effector recognition is unknown. Deletion of the WRKY domain results in an RRS1 allele that triggers constitutive RPS4-dependent defense activation, suggesting that in the absence of effector, the WRKY domain contributes to maintaining the complex in an inactive state. We show the WRKY domain interacts with the adjacent domain 4, and that the inactive state of RRS1 is maintained by WRKY-domain 4 interactions before ligand detection. AvrRps4 interaction with the WRKY domain disrupts WRKY-domain 4 association, thus derepressing the complex. PopP2-triggered activation is less easily explained by such disruption and involves the longer C-terminal extension of RRS1-R. Furthermore, some mutations in RPS4 and RRS1 compromise PopP2 but not AvrRps4 recognition, suggesting that AvrRps4 and PopP2 derepress the complex differently. Consistent with this, a "reversibly closed" conformation of RRS1-R, engineered in a method exploiting the high affinity of colicin E9 and Im9 domains, reversibly loses AvrRps4, but not PopP2 responsiveness. Following RRS1 derepression, interactions between domain 4 and the RPS4 C-terminal domain likely contribute to activation. Simultaneous relief of autoinhibition and activation may contribute to defense activation in many immune receptors.
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Affiliation(s)
- Yan Ma
- The Sainsbury Laboratory, NR4 7UH Norwich, United Kingdom
| | - Hailong Guo
- The Sainsbury Laboratory, NR4 7UH Norwich, United Kingdom
| | - Lanxi Hu
- The Sainsbury Laboratory, NR4 7UH Norwich, United Kingdom
| | | | | | - Volkan Cevik
- The Sainsbury Laboratory, NR4 7UH Norwich, United Kingdom
| | - Pingtao Ding
- The Sainsbury Laboratory, NR4 7UH Norwich, United Kingdom
| | - Zane Duxbury
- The Sainsbury Laboratory, NR4 7UH Norwich, United Kingdom
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9
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de Jong SJ, Créquer A, Matos I, Hum D, Gunasekharan V, Lorenzo L, Jabot-Hanin F, Imahorn E, Arias AA, Vahidnezhad H, Youssefian L, Markle JG, Patin E, D'Amico A, Wang CQF, Full F, Ensser A, Leisner TM, Parise LV, Bouaziz M, Maya NP, Cadena XR, Saka B, Saeidian AH, Aghazadeh N, Zeinali S, Itin P, Krueger JG, Laimins L, Abel L, Fuchs E, Uitto J, Franco JL, Burger B, Orth G, Jouanguy E, Casanova JL. The human CIB1-EVER1-EVER2 complex governs keratinocyte-intrinsic immunity to β-papillomaviruses. J Exp Med 2018; 215:2289-2310. [PMID: 30068544 PMCID: PMC6122964 DOI: 10.1084/jem.20170308] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [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: 02/16/2017] [Revised: 05/21/2018] [Accepted: 07/02/2018] [Indexed: 02/04/2023] Open
Abstract
Patients with epidermodysplasia verruciformis (EV) and biallelic null mutations of TMC6 (encoding EVER1) or TMC8 (EVER2) are selectively prone to disseminated skin lesions due to keratinocyte-tropic human β-papillomaviruses (β-HPVs), which lack E5 and E8. We describe EV patients homozygous for null mutations of the CIB1 gene encoding calcium- and integrin-binding protein-1 (CIB1). CIB1 is strongly expressed in the skin and cultured keratinocytes of controls but not in those of patients. CIB1 forms a complex with EVER1 and EVER2, and CIB1 proteins are not expressed in EVER1- or EVER2-deficient cells. The known functions of EVER1 and EVER2 in human keratinocytes are not dependent on CIB1, and CIB1 deficiency does not impair keratinocyte adhesion or migration. In keratinocytes, the CIB1 protein interacts with the HPV E5 and E8 proteins encoded by α-HPV16 and γ-HPV4, respectively, suggesting that this protein acts as a restriction factor against HPVs. Collectively, these findings suggest that the disruption of CIB1-EVER1-EVER2-dependent keratinocyte-intrinsic immunity underlies the selective susceptibility to β-HPVs of EV patients.
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Affiliation(s)
- Sarah Jill de Jong
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Amandine Créquer
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Irina Matos
- Robin Chemers Neustein Laboratory of Mammalian Development and Cell Biology, The Rockefeller University, New York, NY
| | - David Hum
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | | | - Lazaro Lorenzo
- Laboratory of Human Genetics of Infectious Diseases, Institut National de la Santé et de la Recherche Médicale, UMR 1163, Necker Hospital for Sick Children, Paris, France
- University Paris Descartes, Imagine Institute, Paris, France
| | - Fabienne Jabot-Hanin
- Laboratory of Human Genetics of Infectious Diseases, Institut National de la Santé et de la Recherche Médicale, UMR 1163, Necker Hospital for Sick Children, Paris, France
- University Paris Descartes, Imagine Institute, Paris, France
| | - Elias Imahorn
- Department of Biomedicine, University Hospital Basel and University of Basel, Switzerland
| | - Andres A Arias
- Primary Immunodeficiencies Group, School of Medicine, University of Antioquia, Medellin, Colombia
- School of Microbiology, University of Antioquia, Medellin, Colombia
| | - Hassan Vahidnezhad
- Department of Dermatology and Cutaneous Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
- Molecular Medicine Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
| | - Leila Youssefian
- Department of Dermatology and Cutaneous Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
- Department of Medical Genetics, Tehran University of Medical Sciences, Tehran, Iran
| | - Janet G Markle
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Etienne Patin
- Human Evolutionary Genetics, Pasteur Institute, Paris, France
- National Center for Scientific Research, URA 3012, Paris, France
- Center of Bioinformatics, Biostatistics and Integrative Biology, Pasteur Institute, Paris, France
| | - Aurelia D'Amico
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
| | - Claire Q F Wang
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, NY
| | - Florian Full
- Clinical and Molecular Virology, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Armin Ensser
- Clinical and Molecular Virology, University Hospital Erlangen, Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Tina M Leisner
- Department of Biochemistry and Biophysics and Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Leslie V Parise
- Department of Biochemistry and Biophysics and Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - Matthieu Bouaziz
- Laboratory of Human Genetics of Infectious Diseases, Institut National de la Santé et de la Recherche Médicale, UMR 1163, Necker Hospital for Sick Children, Paris, France
- University Paris Descartes, Imagine Institute, Paris, France
| | | | - Xavier Rueda Cadena
- Dermatology/Oncology - Skin Cancer Unit, National Cancer Institute, Bogota, Colombia
| | - Bayaki Saka
- Department of Dermatology, Sylvanus Olympio Hospital, University of Lomé, Togo
| | - Amir Hossein Saeidian
- Department of Dermatology and Cutaneous Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
| | - Nessa Aghazadeh
- Department of Dermatology, Razi Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Sirous Zeinali
- Molecular Medicine Department, Biotechnology Research Center, Pasteur Institute of Iran, Tehran, Iran
- Kawsar Human Genetics Research Center, Tehran, Iran
| | - Peter Itin
- Department of Biomedicine, University Hospital Basel and University of Basel, Switzerland
- Dermatology, University Hospital Basel, Basel, Switzerland
| | - James G Krueger
- Laboratory of Investigative Dermatology, The Rockefeller University, New York, NY
| | - Lou Laimins
- Department of Microbiology-Immunology, Northwestern University, Chicago, IL
| | - Laurent Abel
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
- Laboratory of Human Genetics of Infectious Diseases, Institut National de la Santé et de la Recherche Médicale, UMR 1163, Necker Hospital for Sick Children, Paris, France
- University Paris Descartes, Imagine Institute, Paris, France
| | - Elaine Fuchs
- Robin Chemers Neustein Laboratory of Mammalian Development and Cell Biology, The Rockefeller University, New York, NY
| | - Jouni Uitto
- Department of Dermatology and Cutaneous Biology, Sidney Kimmel Medical College, Thomas Jefferson University, Philadelphia, PA
- Jefferson Institute of Molecular Medicine, Thomas Jefferson University, Philadelphia, PA
| | - Jose Luis Franco
- Primary Immunodeficiencies Group, School of Medicine, University of Antioquia, Medellin, Colombia
| | - Bettina Burger
- Department of Biomedicine, University Hospital Basel and University of Basel, Switzerland
| | - Gérard Orth
- Department of Virology, Pasteur Institute, Paris, France
| | - Emmanuelle Jouanguy
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
- Laboratory of Human Genetics of Infectious Diseases, Institut National de la Santé et de la Recherche Médicale, UMR 1163, Necker Hospital for Sick Children, Paris, France
- University Paris Descartes, Imagine Institute, Paris, France
| | - Jean-Laurent Casanova
- St. Giles Laboratory of Human Genetics of Infectious Diseases, Rockefeller Branch, The Rockefeller University, New York, NY
- Laboratory of Human Genetics of Infectious Diseases, Institut National de la Santé et de la Recherche Médicale, UMR 1163, Necker Hospital for Sick Children, Paris, France
- University Paris Descartes, Imagine Institute, Paris, France
- Pediatric Hematology-Immunology Unit, Necker Hospital for Sick Children, Paris, France
- Howard Hughes Medical Institute, New York, NY
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10
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Tan P, He L, Cui J, Qian C, Cao X, Lin M, Zhu Q, Li Y, Xing C, Yu X, Wang HY, Wang RF. Assembly of the WHIP-TRIM14-PPP6C Mitochondrial Complex Promotes RIG-I-Mediated Antiviral Signaling. Mol Cell 2017; 68:293-307.e5. [PMID: 29053956 DOI: 10.1016/j.molcel.2017.09.035] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 08/09/2017] [Accepted: 09/25/2017] [Indexed: 01/30/2023]
Abstract
Mitochondrial antiviral signaling platform protein (MAVS) acts as a central hub for RIG-I receptor proximal signal propagation. However, key components in the assembly of the MAVS mitochondrial platform that promote RIG-I mitochondrial localization and optimal activation are still largely undefined. Employing pooled RNAi and yeast two-hybrid screenings, we report that the mitochondrial adaptor protein tripartite motif (TRIM)14 provides a docking platform for the assembly of the mitochondrial signaling complex required for maximal activation of RIG-I-mediated signaling, consisting of WHIP and protein phosphatase PPP6C. Following viral infection, the ubiquitin-binding domain in WHIP bridges RIG-I with MAVS by binding to polyUb chains of RIG-I at lysine 164. The ATPase domain in WHIP contributes to stabilization of the RIG-I-dsRNA interaction. Moreover, phosphatase PPP6C is responsible for RIG-I dephosphorylation. Together, our findings define the WHIP-TRIM14-PPP6C mitochondrial signalosome required for RIG-I-mediated innate antiviral immunity.
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Affiliation(s)
- Peng Tan
- Institute of Biosciences and Technology, College of Medicine, Texas A&M University, Houston, TX 77030, USA; Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Lian He
- Institute of Biosciences and Technology, College of Medicine, Texas A&M University, Houston, TX 77030, USA
| | - Jun Cui
- Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory of Biocontrol, College of Life Sciences, Collaborative Innovation Center of Cancer Medicine, Sun Yat-sen University, Guangzhou 510275, China
| | - Chen Qian
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Xin Cao
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Meng Lin
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Qingyuan Zhu
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Yinyin Li
- Institute of Biosciences and Technology, College of Medicine, Texas A&M University, Houston, TX 77030, USA; Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Changsheng Xing
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Xiao Yu
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA
| | - Helen Y Wang
- Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA.
| | - Rong-Fu Wang
- Institute of Biosciences and Technology, College of Medicine, Texas A&M University, Houston, TX 77030, USA; Center for Inflammation and Epigenetics, Houston Methodist Research Institute, Houston, TX 77030, USA; Department of Microbiology and Immunology, Weill Cornell Medical College, Cornell University, New York, NY 10065, USA.
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11
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Brace PT, Tezera LB, Bielecka MK, Mellows T, Garay D, Tian S, Rand L, Green J, Jogai S, Steele AJ, Millar TM, Sanchez-Elsner T, Friedland JS, Proud CG, Elkington PT. Mycobacterium tuberculosis subverts negative regulatory pathways in human macrophages to drive immunopathology. PLoS Pathog 2017; 13:e1006367. [PMID: 28570642 PMCID: PMC5453634 DOI: 10.1371/journal.ppat.1006367] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [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: 11/08/2016] [Accepted: 04/19/2017] [Indexed: 12/23/2022] Open
Abstract
Tuberculosis remains a global pandemic and drives lung matrix destruction to transmit. Whilst pathways driving inflammatory responses in macrophages have been relatively well described, negative regulatory pathways are less well defined. We hypothesised that Mycobacterium tuberculosis (Mtb) specifically targets negative regulatory pathways to augment immunopathology. Inhibition of signalling through the PI3K/AKT/mTORC1 pathway increased matrix metalloproteinase-1 (MMP-1) gene expression and secretion, a collagenase central to TB pathogenesis, and multiple pro-inflammatory cytokines. In patients with confirmed pulmonary TB, PI3Kδ expression was absent within granulomas. Furthermore, Mtb infection suppressed PI3Kδ gene expression in macrophages. Interestingly, inhibition of the MNK pathway, downstream of pro-inflammatory p38 and ERK MAPKs, also increased MMP-1 secretion, whilst suppressing secretion of TH1 cytokines. Cross-talk between the PI3K and MNK pathways was demonstrated at the level of eIF4E phosphorylation. Mtb globally suppressed the MMP-inhibitory pathways in macrophages, reducing levels of mRNAs encoding PI3Kδ, mTORC-1 and MNK-1 via upregulation of miRNAs. Therefore, Mtb disrupts negative regulatory pathways at multiple levels in macrophages to drive a tissue-destructive phenotype that facilitates transmission.
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Affiliation(s)
- Patience T. Brace
- NIHR Biomedical Research Centre, Clinical and Experimental Sciences Academic Unit, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Liku B. Tezera
- NIHR Biomedical Research Centre, Clinical and Experimental Sciences Academic Unit, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Magdalena K. Bielecka
- NIHR Biomedical Research Centre, Clinical and Experimental Sciences Academic Unit, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Toby Mellows
- NIHR Biomedical Research Centre, Clinical and Experimental Sciences Academic Unit, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Diana Garay
- NIHR Biomedical Research Centre, Clinical and Experimental Sciences Academic Unit, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Shuye Tian
- South Australian Health and Medical Research Institute, Adelaide, and School of Biological Sciences, University of Adelaide, Adelaide, Australia
| | - Lucinda Rand
- Department of Infectious Diseases and Immunity, Imperial College London, London, United Kingdom
| | - Justin Green
- Department of Infectious Diseases and Immunity, Imperial College London, London, United Kingdom
| | - Sanjay Jogai
- NIHR Biomedical Research Centre, Clinical and Experimental Sciences Academic Unit, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Andrew J. Steele
- Cancer Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Timothy M. Millar
- NIHR Biomedical Research Centre, Clinical and Experimental Sciences Academic Unit, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Tilman Sanchez-Elsner
- NIHR Biomedical Research Centre, Clinical and Experimental Sciences Academic Unit, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Jon S. Friedland
- Department of Infectious Diseases and Immunity, Imperial College London, London, United Kingdom
| | - Christopher G. Proud
- South Australian Health and Medical Research Institute, Adelaide, and School of Biological Sciences, University of Adelaide, Adelaide, Australia
| | - Paul T. Elkington
- NIHR Biomedical Research Centre, Clinical and Experimental Sciences Academic Unit, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
- Institute for Life Sciences, University of Southampton, Southampton, United Kingdom
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12
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Bi X, Li F, Liu S, Jin Y, Zhang X, Yang T, Dai Y, Li X, Zhao AZ. ω-3 polyunsaturated fatty acids ameliorate type 1 diabetes and autoimmunity. J Clin Invest 2017; 127:1757-1771. [PMID: 28375156 DOI: 10.1172/jci87388] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Accepted: 02/02/2017] [Indexed: 12/19/2022] Open
Abstract
Despite the benefit of insulin, blockade of autoimmune attack and regeneration of pancreatic islets are ultimate goals for the complete cure of type 1 diabetes (T1D). Long-term consumption of ω-3 polyunsaturated fatty acids (PUFAs) is known to suppress inflammatory processes, making these fatty acids candidates for the prevention and amelioration of autoimmune diseases. Here, we explored the preventative and therapeutic effects of ω-3 PUFAs on T1D. In NOD mice, dietary intervention with ω-3 PUFAs sharply reduced the incidence of T1D, modulated the differentiation of Th cells and Tregs, and decreased the levels of IFN-γ, IL-17, IL-6, and TNF-α. ω-3 PUFAs exerted similar effects on the differentiation of CD4+ T cells isolated from human peripheral blood mononuclear cells. The regulation of CD4+ T cell differentiation was mediated at least in part through ω-3 PUFA eicosanoid derivatives and by mTOR complex 1 (mTORC1) inhibition. Importantly, therapeutic intervention in NOD mice through nutritional supplementation or lentivirus-mediated expression of an ω-3 fatty acid desaturase, mfat-1, normalized blood glucose and insulin levels for at least 182 days, blocked the development of autoimmunity, prevented lymphocyte infiltration into regenerated islets, and sharply elevated the expression of the β cell markers pancreatic and duodenal homeobox 1 (Pdx1) and paired box 4 (Pax4). The findings suggest that ω-3 PUFAs could potentially serve as a therapeutic modality for T1D.
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13
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Sashchenko LP, Romanova EA, Ivanova OK, Sharapova TN, Yashin DV. FasL and the NKG2D receptor are required for the secretion of the Tag7/PGRP-S-Hsp70 complex by the cytotoxic CD8 + lymphocytes. IUBMB Life 2016; 69:30-36. [PMID: 27868339 DOI: 10.1002/iub.1587] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 10/29/2016] [Indexed: 11/07/2022]
Abstract
Tag7 (PGRP-S or PGLYRP1), while possessing an antimicrobial activity, also exhibits an antitumor effect when in complex with the major heat shock protein Hsp70. The cytotoxic Tag7-Hsp70 complex is secreted by lymphocytes after interaction with the HLA-negative tumors. Previously, we have shown that IL-2 induces formation of the CD4+ and CD8+ cytotoxic subpopulations of human lymphocytes, which kill tumor cells through the FasL-Fas interaction. Here, we show that only the CD8+ T cells are able to secrete the Tag7-Hsp70 complex. For its secretion the same proteins on the surface of the lymphocytes and target cells, which are involved in the contact lysis, are necessary as well. The interaction of Fas receptor with FasL leads to an activation of the Tag7-Hsp70 complex in the lymphocyte membrane fraction, and here FasL acts as a receptor that induces intracellular signaling in lymphocytes. An interaction of the MicA stress ligand with the NKG2D receptor is necessary for the release of this cytotoxic complex. It is possible, that CD8+ T lymphocytes interacting with a target cell can both carry out the contact killing of these cells and to secrete the cytotoxic factor. © 2016 IUBMB Life, 69(1):30-36, 2017.
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Affiliation(s)
| | - Elena A Romanova
- Institute of Gene Biology RAS, Vavilova 34/5, Moscow, 119334, Russia
| | - Olga K Ivanova
- Institute of Gene Biology RAS, Vavilova 34/5, Moscow, 119334, Russia
| | | | - Denis V Yashin
- Institute of Gene Biology RAS, Vavilova 34/5, Moscow, 119334, Russia
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14
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Jones DD, Gaudette BT, Wilmore JR, Chernova I, Bortnick A, Weiss BM, Allman D. mTOR has distinct functions in generating versus sustaining humoral immunity. J Clin Invest 2016; 126:4250-4261. [PMID: 27760048 DOI: 10.1172/jci86504] [Citation(s) in RCA: 113] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 09/08/2016] [Indexed: 12/11/2022] Open
Abstract
Little is known about the role of mTOR signaling in plasma cell differentiation and function. Furthermore, for reasons not understood, mTOR inhibition reverses antibody-associated disease in a murine model of systemic lupus erythematosus. Here, we have demonstrated that induced B lineage-specific deletion of the gene encoding RAPTOR, an essential signaling adaptor for rapamycin-sensitive mTOR complex 1 (mTORC1), abrogated the generation of antibody-secreting plasma cells in mice. Acute treatment with rapamycin recapitulated the effects of RAPTOR deficiency, and both strategies led to the ablation of newly formed plasma cells in the spleen and bone marrow while also obliterating preexisting germinal centers. Surprisingly, although perturbing mTOR activity caused a profound decline in serum antibodies that were specific for exogenous antigen or DNA, frequencies of long-lived bone marrow plasma cells were unaffected. Instead, mTORC1 inhibition led to decreased expression of immunoglobulin-binding protein (BiP) and other factors needed for robust protein synthesis. Consequently, blockade of antibody synthesis was rapidly reversed after termination of rapamycin treatment. We conclude that mTOR signaling plays critical but diverse roles in early and late phases of antibody responses and plasma cell differentiation.
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15
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Nguyen HD, Chatterjee S, Haarberg KMK, Wu Y, Bastian D, Heinrichs J, Fu J, Daenthanasanmak A, Schutt S, Shrestha S, Liu C, Wang H, Chi H, Mehrotra S, Yu XZ. Metabolic reprogramming of alloantigen-activated T cells after hematopoietic cell transplantation. J Clin Invest 2016; 126:1337-52. [PMID: 26950421 DOI: 10.1172/jci82587] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 01/21/2016] [Indexed: 12/13/2022] Open
Abstract
Alloreactive donor T cells are the driving force in the induction of graft-versus-host disease (GVHD), yet little is known about T cell metabolism in response to alloantigens after hematopoietic cell transplantation (HCT). Here, we have demonstrated that donor T cells undergo metabolic reprograming after allogeneic HCT. Specifically, we employed a murine allogeneic BM transplant model and determined that T cells switch from fatty acid β-oxidation (FAO) and pyruvate oxidation via the tricarboxylic (TCA) cycle to aerobic glycolysis, thereby increasing dependence upon glutaminolysis and the pentose phosphate pathway. Glycolysis was required for optimal function of alloantigen-activated T cells and induction of GVHD, as inhibition of glycolysis by targeting mTORC1 or 6-phosphofructo-2-kinase/fructose-2,6-biphosphatase 3 (PFKFB3) ameliorated GVHD mortality and morbidity. Together, our results indicate that donor T cells use glycolysis as the predominant metabolic process after allogeneic HCT and suggest that glycolysis has potential as a therapeutic target for the control of GVHD.
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16
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Mehravaran A, Jaafari MR, Jalali SA, Khamesipour A, Tafaghodi M, Hojatizade M, Abbasi A, Badiee A. Cationic Immune Stimulating Complexes Containing Soluble Leishmania Antigens: Preparation, Characterization and in Vivo Immune Response Evaluation. Iran J Immunol 2015; 12:274-287. [PMID: 26714419] [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] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
BACKGROUND Cationic immune stimulating complexes (PLUSCOMs) are particulate antigen delivery systems. PLUSCOMs consist of cationic immunostimulatory complexes (ISCOMs) derivatives and are able to elicit in vivo T cell responses against an antigen. OBJECTIVE To evaluate the effects of PLUSCOMs containing Leishmania major antigens (SLA) on the type of immune response generated in the murine model of leishmaniasis. METHODS PLUSCOMs consisting of 1, 2-dioleoyl-3-trimethylammonium-propane (DOTAP) were used as antigen delivery system/immunoadjuvants for soluble SLA. BALB/c mice were immunized subcutaneously, three times in 2-week intervals. Footpads swellings at the site of challenge and parasite loads were assessed as a measure of protection. The immune responses were also evaluated by determination of IgG subclasses and the level of IFN-γ and IL-4 in cultured splenocytes. RESULTS There was no significant difference (p<0.05) between the sizes of lesions in mice immunized with different formulations. Also, there was no significant difference in the number of parasites in the footpad or spleen of all groups compared with the control group. The highest level of IFN-γ secretion was observed in the splenocytes of mice immunized with PLUSCOM/SLA (p<0.001) and lower amounts of IL-4 was observed in PLUSCOM group (p<0.001) as compared to negative control. CONCLUSION Our results indicated that SLA in different formulations generated an immune response with mixed Th1/Th2 response that was not protective enough despite the activation of CD4+ T cells with secreting IFN-γ in groups which received PLUSCOM with antigen.
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Affiliation(s)
- Ahmad Mehravaran
- Nanotechnology Research Center, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran, e-mail:
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17
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Krishnan B, Massilamany C, Basavalingappa RH, Rajasekaran RA, Kuszynski C, Switzer B, Peterson DA, Reddy J. Versatility of using major histocompatibility complex class II dextramers for derivation and characterization of antigen-specific, autoreactive T cell hybridomas. J Immunol Methods 2015; 426:86-94. [PMID: 26268454 PMCID: PMC4651793 DOI: 10.1016/j.jim.2015.08.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 08/07/2015] [Accepted: 08/07/2015] [Indexed: 01/09/2023]
Abstract
Antigen-specific, T cell hybridomas are useful to study the cellular, molecular and functional events, but their generation is a lengthy process. Thus, there is a need to develop robust methods to generate the hybridoma clones rapidly in a short period of time. To this end, we have demonstrated a novel approach using major histocompatibility complex (MHC) class II dextramers to generate T cell hybridomas for an autoantigen, proteolipid protein (PLP) 139-151. Using MHC class II dextramers assembled with PLP 139-151 as screening and sorting tools, we successfully obtained mono antigen-specific clones within seven to eight weeks. In conjunction with other T cell markers, dextramers permitted phenotypic characterization of hybridoma clones for their antigen specificity in a single step by flow cytometry. Importantly, we achieved successful fusions using dextramer(+) cells sorted by flow cytometry as a starting population, resulting in direct identification of multiple antigen-specific clones. Characterization of selected clones led us to identify chemokine receptor, CCR4(+) to be expressed consistently, but their cytokine-producing ability was variable. Our work provides a proof-of principle that the antigen-specific, CD4 T cell hybridoma clones can be generated directly using MHC class II dextramers. The availability of hybridoma clones that bind dextramers may serve as useful tools for various in vitro and in vivo applications.
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Affiliation(s)
- Bharathi Krishnan
- School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583, United States
| | - Chandirasegaran Massilamany
- School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583, United States
| | - Rakesh H Basavalingappa
- School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583, United States
| | - Rajkumar A Rajasekaran
- School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583, United States
| | - Charles Kuszynski
- Nebraska Center for Virology, University of Nebraska-Lincoln, Lincoln, NE 68583, United States
| | - Barbara Switzer
- College of Medicine, Dean's Research Laboratory, University of Nebraska Medical Center, Omaha, NE 68918, United States
| | - Daniel A Peterson
- Department of Pathology, Johns Hopkins School of Medicine, Baltimore, MD 21205, United States
| | - Jay Reddy
- School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, NE 68583, United States.
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18
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Richer MJ, Pewe LL, Hancox LS, Hartwig SM, Varga SM, Harty JT. Inflammatory IL-15 is required for optimal memory T cell responses. J Clin Invest 2015; 125:3477-90. [PMID: 26241055 DOI: 10.1172/jci81261] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 06/18/2015] [Indexed: 12/22/2022] Open
Abstract
Due to their ability to rapidly proliferate and produce effector cytokines, memory CD8+ T cells increase protection following reexposure to a pathogen. However, low inflammatory immunizations do not provide memory CD8+ T cells with a proliferation advantage over naive CD8+ T cells, suggesting that cell-extrinsic factors enhance memory CD8+ T cell proliferation in vivo. Herein, we demonstrate that inflammatory signals are critical for the rapid proliferation of memory CD8+ T cells following infection. Using murine models of viral infection and antigen exposure, we found that type I IFN-driven expression of IL-15 in response to viral infection prepares memory CD8+ T cells for rapid division independently of antigen reexposure by transiently inducing cell-cycle progression via a pathway dependent on mTOR complex-1 (mTORC1). Moreover, exposure to IL-15 allowed more rapid division of memory CD8+ T cells following antigen encounter and enhanced their protective capacity against viral infection. Together, these data reveal that inflammatory IL-15 promotes optimal responses by memory CD8+ T cells.
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19
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Huang F, Guo Y, Zhang R, Yi Y, Deng Y, Su D, Zhang M. Effects of drying methods on physicochemical and immunomodulatory properties of polysaccharide-protein complexes from litchi pulp. Molecules 2014; 19:12760-76. [PMID: 25140451 PMCID: PMC6271374 DOI: 10.3390/molecules190812760] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 08/09/2014] [Accepted: 08/14/2014] [Indexed: 11/23/2022] Open
Abstract
Dried litchi pulp has been used in traditional remedies in China for many years to treat various diseases, and the therapeutic activity has been, at least partly, attributed to the presence of bioactive polysaccharides. Polysaccharide-protein complexes from vacuum freeze-(VF), vacuum microwave-(VM) and heat pump (HP) dried litchi pulp, which were coded as LP-VF, LP-VM and LP-HP, were comparatively studied on the physicochemical and immunomodulatory properties. LP-HP had a predominance of galactose, while glucose was the major sugar component in LP-VF and LP-VM. Compared with LP-VF and LP-VM, LP-HP contained more aspartate and glutamic in binding protein. LP-HP also exhibited a stronger stimulatory effect on splenocyte proliferation at 200 μg/mL and triggered higher NO, TNF-α and IL-6 secretion from RAW264.7 macrophages. Different drying methods caused the difference in physicochemical properties of polysaccharide-protein complexes from dried litchi pulp, which resulted in significantly different immunomodulatory activity. HP drying appears to be the best method for preparing litchi pulp to improve its immunomodulatory properties.
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Affiliation(s)
- Fei Huang
- Department of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Yajuan Guo
- Department of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Ruifen Zhang
- Sericultural and Agri-food Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510610, China
| | - Yang Yi
- College of Food Science & Engineering, Wuhan Polytechnic University, Wuhan 430023, China
| | - Yuanyuan Deng
- Sericultural and Agri-food Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510610, China
| | - Dongxiao Su
- Department of Food Science and Technology, Huazhong Agricultural University, Wuhan 430070, China
| | - Mingwei Zhang
- Sericultural and Agri-food Research Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510610, China.
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Festuccia WT, Pouliot P, Bakan I, Sabatini DM, Laplante M. Myeloid-specific Rictor deletion induces M1 macrophage polarization and potentiates in vivo pro-inflammatory response to lipopolysaccharide. PLoS One 2014; 9:e95432. [PMID: 24740015 PMCID: PMC3989321 DOI: 10.1371/journal.pone.0095432] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [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: 12/19/2013] [Accepted: 03/27/2014] [Indexed: 01/04/2023] Open
Abstract
The phosphoinositide-3-kinase (PI3K)/protein kinase B (Akt) axis plays a central role in attenuating inflammation upon macrophage stimulation with toll-like receptor (TLR) ligands. The mechanistic target of rapamycin complex 2 (mTORC2) relays signal from PI3K to Akt but its role in modulating inflammation in vivo has never been investigated. To evaluate the role of mTORC2 in the regulation of inflammation in vivo, we have generated a mouse model lacking Rictor, an essential mTORC2 component, in myeloid cells. Primary macrophages isolated from myeloid-specific Rictor null mice exhibited an exaggerated response to TLRs ligands, and expressed high levels of M1 genes and lower levels of M2 markers. To determine whether the loss of Rictor similarly affected inflammation in vivo, mice were either fed a high fat diet, a situation promoting chronic but low-grade inflammation, or were injected with lipopolysaccharide (LPS), which mimics an acute, severe septic inflammatory condition. Although high fat feeding contributed to promote obesity, inflammation, macrophage infiltration in adipose tissue and systemic insulin resistance, we did not observe a significant impact of Rictor loss on these parameters. However, mice lacking Rictor exhibited a higher sensitivity to sceptic shock when injected with LPS. Altogether, these results indicate that mTORC2 is a key negative regulator of macrophages TLR signalling and that its role in modulating inflammation is particularly important in the context of severe inflammatory challenges. These observations suggest that approaches aimed at modulating mTORC2 activity may represent a possible therapeutic approach for diseases linked to excessive inflammation.
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Affiliation(s)
- William T. Festuccia
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Philippe Pouliot
- Centre de Recherche de l’Institut Universitaire de Cardiologie et de Pneumologie de Québec (CRIUCPQ), Université Laval, Québec, Québec, Canada
| | - Inan Bakan
- Centre de Recherche de l’Institut Universitaire de Cardiologie et de Pneumologie de Québec (CRIUCPQ), Université Laval, Québec, Québec, Canada
| | - David M. Sabatini
- Whitehead Institute for Biomedical Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
- Howard Hughes Medical Institute, Massachusetts Institute of Technology, Massachusetts, United States of America
- Koch Center for Integrative Cancer Research at MIT, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States of America
| | - Mathieu Laplante
- Centre de Recherche de l’Institut Universitaire de Cardiologie et de Pneumologie de Québec (CRIUCPQ), Université Laval, Québec, Québec, Canada
- * E-mail:
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21
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Makki K, Taront S, Molendi-Coste O, Bouchaert E, Neve B, Eury E, Lobbens S, Labalette M, Duez H, Staels B, Dombrowicz D, Froguel P, Wolowczuk I. Beneficial metabolic effects of rapamycin are associated with enhanced regulatory cells in diet-induced obese mice. PLoS One 2014; 9:e92684. [PMID: 24710396 PMCID: PMC3977858 DOI: 10.1371/journal.pone.0092684] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Accepted: 02/25/2014] [Indexed: 12/20/2022] Open
Abstract
The “mechanistic target of rapamycin” (mTOR) is a central controller of growth, proliferation and/or motility of various cell-types ranging from adipocytes to immune cells, thereby linking metabolism and immunity. mTOR signaling is overactivated in obesity, promoting inflammation and insulin resistance. Therefore, great interest exists in the development of mTOR inhibitors as therapeutic drugs for obesity or diabetes. However, despite a plethora of studies characterizing the metabolic consequences of mTOR inhibition in rodent models, its impact on immune changes associated with the obese condition has never been questioned so far. To address this, we used a mouse model of high-fat diet (HFD)-fed mice with and without pharmacologic mTOR inhibition by rapamycin. Rapamycin was weekly administrated to HFD-fed C57BL/6 mice for 22 weeks. Metabolic effects were determined by glucose and insulin tolerance tests and by indirect calorimetry measures of energy expenditure. Inflammatory response and immune cell populations were characterized in blood, adipose tissue and liver. In parallel, the activities of both mTOR complexes (e. g. mTORC1 and mTORC2) were determined in adipose tissue, muscle and liver. We show that rapamycin-treated mice are leaner, have enhanced energy expenditure and are protected against insulin resistance. These beneficial metabolic effects of rapamycin were associated to significant changes of the inflammatory profiles of both adipose tissue and liver. Importantly, immune cells with regulatory functions such as regulatory T-cells (Tregs) and myeloid-derived suppressor cells (MDSCs) were increased in adipose tissue. These rapamycin-triggered metabolic and immune effects resulted from mTORC1 inhibition whilst mTORC2 activity was intact. Taken together, our results reinforce the notion that controlling immune regulatory cells in metabolic tissues is crucial to maintain a proper metabolic status and, more generally, comfort the need to search for novel pharmacological inhibitors of the mTOR signaling pathway to prevent and/or treat metabolic diseases.
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Affiliation(s)
- Kassem Makki
- Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR)8199, Lille Pasteur Institute, Lille, France
- Lille 2 University, Lille, France
- European Genomic Institute for Diabetes (EGID), Lille, France
| | - Solenne Taront
- Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR)8199, Lille Pasteur Institute, Lille, France
- Lille 2 University, Lille, France
- European Genomic Institute for Diabetes (EGID), Lille, France
| | - Olivier Molendi-Coste
- Lille 2 University, Lille, France
- European Genomic Institute for Diabetes (EGID), Lille, France
- Institut National de la Santé et de la Recherche Médicale (Inserm), UMR1011, Lille Pasteur Institute, Lille, France
| | - Emmanuel Bouchaert
- Lille 2 University, Lille, France
- European Genomic Institute for Diabetes (EGID), Lille, France
- Institut National de la Santé et de la Recherche Médicale (Inserm), UMR1011, Lille Pasteur Institute, Lille, France
| | - Bernadette Neve
- Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR)8199, Lille Pasteur Institute, Lille, France
- Lille 2 University, Lille, France
- European Genomic Institute for Diabetes (EGID), Lille, France
| | - Elodie Eury
- Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR)8199, Lille Pasteur Institute, Lille, France
- Lille 2 University, Lille, France
- European Genomic Institute for Diabetes (EGID), Lille, France
| | - Stéphane Lobbens
- Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR)8199, Lille Pasteur Institute, Lille, France
- Lille 2 University, Lille, France
- European Genomic Institute for Diabetes (EGID), Lille, France
| | - Myriam Labalette
- Lille 2 University, Lille, France
- Immunology Institute, Centre Hospitalier Régional Universitaire (CHRU) Lille and Equipe d'Accueil (EA)2686, Lille 2 University, Lille, France
| | - Hélène Duez
- Lille 2 University, Lille, France
- European Genomic Institute for Diabetes (EGID), Lille, France
- Institut National de la Santé et de la Recherche Médicale (Inserm), UMR1011, Lille Pasteur Institute, Lille, France
| | - Bart Staels
- Lille 2 University, Lille, France
- European Genomic Institute for Diabetes (EGID), Lille, France
- Institut National de la Santé et de la Recherche Médicale (Inserm), UMR1011, Lille Pasteur Institute, Lille, France
| | - David Dombrowicz
- Lille 2 University, Lille, France
- European Genomic Institute for Diabetes (EGID), Lille, France
- Institut National de la Santé et de la Recherche Médicale (Inserm), UMR1011, Lille Pasteur Institute, Lille, France
| | - Philippe Froguel
- Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR)8199, Lille Pasteur Institute, Lille, France
- Lille 2 University, Lille, France
- European Genomic Institute for Diabetes (EGID), Lille, France
- Department of Genomics of Common Disease, School of Public Health, Imperial College London, London, United Kingdom
- * E-mail: (PF); (IW)
| | - Isabelle Wolowczuk
- Centre National de la Recherche Scientifique (CNRS), Unité Mixte de Recherche (UMR)8199, Lille Pasteur Institute, Lille, France
- Lille 2 University, Lille, France
- European Genomic Institute for Diabetes (EGID), Lille, France
- * E-mail: (PF); (IW)
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22
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Josson S, Matsuoka Y, Gururajan M, Nomura T, Huang WC, Yang X, Lin JT, Bridgman R, Chu CY, Johnstone PA, Zayzafoon M, Hu P, Zhau H, Berel D, Rogatko A, Chung LWK. Inhibition of β2-microglobulin/hemochromatosis enhances radiation sensitivity by induction of iron overload in prostate cancer cells. PLoS One 2013; 8:e68366. [PMID: 23874600 PMCID: PMC3707913 DOI: 10.1371/journal.pone.0068366] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [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: 04/24/2013] [Accepted: 05/16/2013] [Indexed: 11/20/2022] Open
Abstract
Background Bone metastasis is the most lethal form of several cancers. The β2-microglobulin (β2-M)/hemochromatosis (HFE) complex plays an important role in cancer development and bone metastasis. We demonstrated previously that overexpression of β2-M in prostate, breast, lung and renal cancer leads to increased bone metastasis in mouse models. Therefore, we hypothesized that β2-M is a rational target to treat prostate cancer bone metastasis. Results In this study, we demonstrate the role of β2-M and its binding partner, HFE, in modulating radiation sensitivity and chemo-sensitivity of prostate cancer. By genetic deletion of β2-M or HFE or using an anti-β2-M antibody (Ab), we demonstrate that prostate cancer cells are sensitive to radiation in vitro and in vivo. Inhibition of β2-M or HFE sensitized prostate cancer cells to radiation by increasing iron and reactive oxygen species and decreasing DNA repair and stress response proteins. Using xenograft mouse model, we demonstrate that anti-β2-M Ab sensitizes prostate cancer cells to radiation treatment. Additionally, anti-β2-M Ab was able to prevent tumor growth in an immunocompetent spontaneous prostate cancer mouse model. Since bone metastasis is lethal, we used a bone xenograft model to test the ability of anti-β2-M Ab and radiation to block tumor growth in the bone. Combination treatment significantly prevented tumor growth in the bone xenograft model by inhibiting β2-M and inducing iron overload. In addition to radiation sensitive effects, inhibition of β2-M sensitized prostate cancer cells to chemotherapeutic agents. Conclusion Since prostate cancer bone metastatic patients have high β2-M in the tumor tissue and in the secreted form, targeting β2-M with anti-β2-M Ab is a promising therapeutic agent. Additionally, inhibition of β2-M sensitizes cancer cells to clinically used therapies such as radiation by inducing iron overload and decreasing DNA repair enzymes.
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Affiliation(s)
- Sajni Josson
- Uro-Oncology Research Program, Department of Medicine, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
- * E-mail: (SJ); (LC)
| | - Yasuhiro Matsuoka
- Uro-Oncology Research Program, Department of Medicine, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
| | - Murali Gururajan
- Uro-Oncology Research Program, Department of Medicine, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
| | - Takeo Nomura
- Molecular Urology and Therapeutics, Emory University School of Medicine, Atlanta, Georgia United States of America
| | - Wen-Chin Huang
- Uro-Oncology Research Program, Department of Medicine, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
| | - Xiaojian Yang
- Uro-Oncology Research Program, Department of Medicine, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
| | - Jin-tai Lin
- Uro-Oncology Research Program, Department of Medicine, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
| | - Roger Bridgman
- Hybridoma Facility, Auburn University, Auburn, Alabama, United States of America
| | - Chia-Yi Chu
- Uro-Oncology Research Program, Department of Medicine, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
| | - Peter A. Johnstone
- Radiation Oncology, Indiana University School of Medicine, Bloomington, Indiana, United States of America
| | - Majd Zayzafoon
- Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Peizhen Hu
- Uro-Oncology Research Program, Department of Medicine, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
| | - Haiyen Zhau
- Uro-Oncology Research Program, Department of Medicine, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
| | - Dror Berel
- Biostatistics and Bioinformatics, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
| | - Andre Rogatko
- Biostatistics and Bioinformatics, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
| | - Leland W. K. Chung
- Uro-Oncology Research Program, Department of Medicine, Samuel Oschin Comprehensive Cancer Institute, Cedars-Sinai Medical Center, Los Angeles, California, United States of America
- * E-mail: (SJ); (LC)
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23
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Roth S, Ruland J. Caspase recruitment domain-containing protein 9 signaling in innate immunity and inflammation. Trends Immunol 2013; 34:243-50. [PMID: 23523010 DOI: 10.1016/j.it.2013.02.006] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 01/28/2013] [Accepted: 02/15/2013] [Indexed: 12/16/2022]
Abstract
Caspase recruitment domain-containing protein (Card)9 is a nonredundant adapter protein that functions in the innate immune system in the assembly of multifunctional signaling complexes. Together with B cell lymphoma (Bcl)10 and the paracaspase, mucosa-associated lymphoid tissue lymphoma translocation protein (Malt)1, Card9 links spleen-tyrosine kinase (Syk)-coupled C-type lectin receptors to inflammatory responses. Card9 signaling also responds to intracellular danger sensors, such as retinoic acid-inducible gene 1 (RIG-I)-like receptors (RLRs) and nucleotide-oligomerization domain (Nod)2. Card9 complexes are engaged upon fungal, bacterial, or viral recognition, and they are essential for host protection. Moreover, Card9 polymorphisms are commonly associated with human inflammatory diseases. Here, we discuss the molecular regulation and the physiological functions of Card9 in host defense and immune homeostasis, and provide a framework for the therapeutic targeting of Card9 signaling in immune-mediated diseases.
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Affiliation(s)
- Susanne Roth
- Institut für Klinische Chemie und Pathobiochemie, Klinikum rechts der Isar, Technische Universität München, 81675 Munich, Germany
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24
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Heilkenbrinker U, Dietrich R, Didier A, Zhu K, Lindbäck T, Granum PE, Märtlbauer E. Complex formation between NheB and NheC is necessary to induce cytotoxic activity by the three-component Bacillus cereus Nhe enterotoxin. PLoS One 2013; 8:e63104. [PMID: 23646182 PMCID: PMC3639968 DOI: 10.1371/journal.pone.0063104] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Accepted: 03/28/2013] [Indexed: 12/23/2022] Open
Abstract
The nonhemolytic enterotoxin (Nhe) is known as a major pathogenicity factor for the diarrheal type of food poisoning caused by Bacillus cereus. The Nhe complex consists of NheA, NheB and NheC, all of them required to reach maximum cytotoxicity following a specific binding order on cell membranes. Here we show that complexes, formed between NheB and NheC under natural conditions before targeting the host cells, are essential for toxicity in Vero cells. To enable detection of NheC and its interaction with NheB, monoclonal antibodies against NheC were established and characterized. The antibodies allowed detection of recombinant NheC in a sandwich immunoassay at levels below 10 ng ml−1, but no or only minor amounts of NheC were detectable in natural culture supernatants of B. cereus strains. When NheB- and NheC-specific monoclonal antibodies were combined in a sandwich immunoassay, complexes between NheB and NheC could be demonstrated. The level of these complexes was directly correlated with the relative concentrations of NheB and NheC. Toxicity, however, showed a bell-shaped dose-response curve with a plateau at ratios of NheB and NheC between 50:1 and 5:1. Both lower and higher ratios between NheB and NheC strongly reduced cytotoxicity. When the ratio approached an equimolar ratio, complex formation reached its maximum resulting in decreased binding of NheB to Vero cells. These data indicate that a defined level of NheB-NheC complexes as well as a sufficient amount of free NheB is necessary for efficient cell binding and toxicity. Altogether, the results of this study provide evidence that the interaction of NheB and NheC is a balanced process, necessary to induce, but also able to limit the toxic action of Nhe.
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Affiliation(s)
- Uta Heilkenbrinker
- Department of Veterinary Sciences, Ludwig-Maximilians-Universität München, Oberschleissheim, Germany
| | - Richard Dietrich
- Department of Veterinary Sciences, Ludwig-Maximilians-Universität München, Oberschleissheim, Germany
| | - Andrea Didier
- Department of Veterinary Sciences, Ludwig-Maximilians-Universität München, Oberschleissheim, Germany
| | - Kui Zhu
- Department of Veterinary Sciences, Ludwig-Maximilians-Universität München, Oberschleissheim, Germany
| | - Toril Lindbäck
- Department of Food Safety and Infection Biology, Norwegian School of Veterinary Science, Oslo, Norway
| | - Per Einar Granum
- Department of Food Safety and Infection Biology, Norwegian School of Veterinary Science, Oslo, Norway
| | - Erwin Märtlbauer
- Department of Veterinary Sciences, Ludwig-Maximilians-Universität München, Oberschleissheim, Germany
- * E-mail:
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25
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Ma YJ, Skjoedt MO, Garred P. Collectin-11/MASP complex formation triggers activation of the lectin complement pathway--the fifth lectin pathway initiation complex. J Innate Immun 2012; 5:242-50. [PMID: 23220946 PMCID: PMC6741501 DOI: 10.1159/000345356] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 10/22/2012] [Accepted: 10/22/2012] [Indexed: 11/19/2022] Open
Abstract
Collectins and ficolins are important in the clearance of endogenous and exogenous danger materials. A new human collectin-11 was recently identified in low concentration in serum in complex with mannose-binding lectin (MBL)/ficolin-associated serine proteases. Collectin-11 binds to carbohydrate residues present on various microorganisms. Thus, we hypothesized that collectin-11 could be a novel initiation molecule in the lectin pathway of complement. We can show that collectin-11 associates with all the known MBL-associated serine proteases (MASP-1, MASP-2 and MASP-3) as well as the lectin complement pathway regulator MAP-1. Furthermore, we found that complex formation between recombinant collectin-11 and recombinant MASP-2 on Candida albicans leads to deposition of C4b. Native collectin-11 in serum mediated complement activation and deposition of C4b and C3b, and formation of the terminal complement complex on C. albicans. Moreover, spiking collectin-11-depleted serum, which did not mediate complement activation, with recombinant collectin-11 restored the complement activation capability. These results define collectin-11 as the fifth recognition molecule in the lectin complement pathway in addition to MBL, ficolin-1, ficolin-2 and ficolin-3.
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Affiliation(s)
| | | | - Peter Garred
- Laboratory of Molecular Medicine, Department of Clinical Immunology, Rigshospitalet, Faculty of Health Sciences, University of Copenhagen, Copenhagen, Denmark
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26
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Pythoud C, Rodrigo WWSI, Pasqual G, Rothenberger S, Martínez-Sobrido L, de la Torre JC, Kunz S. Arenavirus nucleoprotein targets interferon regulatory factor-activating kinase IKKε. J Virol 2012; 86:7728-38. [PMID: 22532683 PMCID: PMC3421673 DOI: 10.1128/jvi.00187-12] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.0] [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: 01/23/2012] [Accepted: 04/06/2012] [Indexed: 12/24/2022] Open
Abstract
Arenaviruses perturb innate antiviral defense by blocking induction of type I interferon (IFN) production. Accordingly, the arenavirus nucleoprotein (NP) was shown to block activation and nuclear translocation of interferon regulatory factor 3 (IRF3) in response to virus infection. Here, we sought to identify cellular factors involved in innate antiviral signaling targeted by arenavirus NP. Consistent with previous studies, infection with the prototypic arenavirus lymphocytic choriomeningitis virus (LCMV) prevented phosphorylation of IRF3 in response to infection with Sendai virus, a strong inducer of the retinoic acid-inducible gene I (RIG-I)/mitochondrial antiviral signaling (MAVS) pathway of innate antiviral signaling. Using a combination of coimmunoprecipitation and confocal microscopy, we found that LCMV NP associates with the IκB kinase (IKK)-related kinase IKKε but that, rather unexpectedly, LCMV NP did not bind to the closely related TANK-binding kinase 1 (TBK-1). The NP-IKKε interaction was highly conserved among arenaviruses from different clades. In LCMV-infected cells, IKKε colocalized with NP but not with MAVS located on the outer membrane of mitochondria. LCMV NP bound the kinase domain (KD) of IKKε (IKBKE) and blocked its autocatalytic activity and its ability to phosphorylate IRF3, without undergoing phosphorylation. Together, our data identify IKKε as a novel target of arenavirus NP. Engagement of NP seems to sequester IKKε in an inactive complex. Considering the important functions of IKKε in innate antiviral immunity and other cellular processes, the NP-IKKε interaction likely plays a crucial role in arenavirus-host interaction.
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Affiliation(s)
- Christelle Pythoud
- Institute of Microbiology University Hospital Center and University of Lausanne, Lausanne, Switzerland
| | | | - Giulia Pasqual
- Institute of Microbiology University Hospital Center and University of Lausanne, Lausanne, Switzerland
| | - Sylvia Rothenberger
- Institute of Microbiology University Hospital Center and University of Lausanne, Lausanne, Switzerland
| | - Luis Martínez-Sobrido
- Department of Microbiology and Immunology, University of Rochester, Rochester, New York, USA
| | - Juan Carlos de la Torre
- Department of Immunology and Microbial Science, The Scripps Research Institute, La Jolla, California, USA
| | - Stefan Kunz
- Institute of Microbiology University Hospital Center and University of Lausanne, Lausanne, Switzerland
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27
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Tofaris GK, Irani SR, Cheeran BJ, Baker IWS, Cader ZM, Vincent A. Immunotherapy-responsive chorea as the presenting feature of LGI1-antibody encephalitis. Neurology 2012; 79:195-6. [PMID: 22744657 PMCID: PMC3390544 DOI: 10.1212/wnl.0b013e31825f0522] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2011] [Accepted: 02/08/2012] [Indexed: 01/17/2023] Open
Affiliation(s)
- George K Tofaris
- Nuffield Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford University, Oxford, UK.
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28
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Lu R, Pan H, Shively JE. CEACAM1 negatively regulates IL-1β production in LPS activated neutrophils by recruiting SHP-1 to a SYK-TLR4-CEACAM1 complex. PLoS Pathog 2012; 8:e1002597. [PMID: 22496641 PMCID: PMC3320586 DOI: 10.1371/journal.ppat.1002597] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [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: 09/01/2011] [Accepted: 02/08/2012] [Indexed: 01/07/2023] Open
Abstract
LPS-activated neutrophils secrete IL-1β by activation of TLR-4. Based on studies in macrophages, it is likely that ROS and lysosomal destabilization regulated by Syk activation may also be involved. Since neutrophils have abundant expression of the ITIM-containing co-receptor CEACAM1 and Gram-negative bacteria such as Neisseria utilize CEACAM1 as a receptor that inhibits inflammation, we hypothesized that the overall production of IL-1β in LPS treated neutrophils may be negatively regulated by CEACAM1. We found that LPS treated neutrophils induced phosphorylation of Syk resulting in the formation of a complex including TLR4, p-Syk, and p-CEACAM1, which in turn, recruited the inhibitory phosphatase SHP-1. LPS treatment leads to ROS production, lysosomal damage, caspase-1 activation and IL-1β secretion in neutrophils. The absence of this regulation in Ceacam1−/− neutrophils led to hyper production of IL-1β in response to LPS. The hyper production of IL-1β was abrogated by in vivo reconstitution of wild type but not ITIM-mutated CEACAM1 bone marrow stem cells. Blocking Syk activation by kinase inhibitors or RNAi reduced Syk phosphorylation, lysosomal destabilization, ROS production, and caspase-1 activation in Ceacam1−/− neutrophils. We conclude that LPS treatment of neutrophils triggers formation of a complex of TLR4 with pSyk and pCEACAM1, which upon recruitment of SHP-1 to the ITIMs of pCEACAM1, inhibits IL-1β production by the inflammasome. Thus, CEACAM1 fine-tunes IL-1β production in LPS treated neutrophils, explaining why the additional utilization of CEACAM1 as a pathogen receptor would further inhibit inflammation. Pathogens often evade the immune system by directly binding to and inhibiting neutrophils, abundant white cells that accumulate at the site of infection. For example Gram-negative Neisseria pathogens, such as those that cause gonorrhea or meningitis, bind the neutrophil receptor CEACAM1. Gram-negative bacteria express lipopolysaccharide (LPS) that interacts with toll-like receptor-4 (TLR4) on neutrophils. Since CEACAM1 is an inhibitory receptor, we hypothesized that LPS activation of TLR4 would be inhibited. In this paper we show that this is the case and that the mechanism of LPS inhibition involves induction of a complex between the LPS receptor TLR4, CEACAM1 and an activating kinase called Syk. In the presence of CEACAM1, an inhibitory phosphatase (opposes the kinase) is recruited to the complex that prevents the activation of Syk. The net effect is the inhibition of the pathway that normally leads to the production of the pro-inflammatory cytokine IL-1β. We show that this inhibition is lost in CEACAM1 deficient neutrophils leading to hyper production of IL-1β. We think that CEACAM1 fine-tunes the normal inflammatory response at the site of infection preventing hyper-inflammation, but in the case of Gram-negative pathogens that actually bind to neutrophils, inflammation is further blunted, favoring the infectious process.
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Affiliation(s)
- Rongze Lu
- City of Hope Irell & Manella Graduate School of Biological Sciences, Duarte, California, United States of America
- Department of Immunology, Beckman Research Institute of City of Hope, Duarte, California, United States of America
| | - Hao Pan
- City of Hope Irell & Manella Graduate School of Biological Sciences, Duarte, California, United States of America
- Department of Immunology, Beckman Research Institute of City of Hope, Duarte, California, United States of America
| | - John E. Shively
- Department of Immunology, Beckman Research Institute of City of Hope, Duarte, California, United States of America
- * E-mail:
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D'Osualdo A, Weichenberger CX, Wagner RN, Godzik A, Wooley J, Reed JC. CARD8 and NLRP1 undergo autoproteolytic processing through a ZU5-like domain. PLoS One 2011; 6:e27396. [PMID: 22087307 PMCID: PMC3210808 DOI: 10.1371/journal.pone.0027396] [Citation(s) in RCA: 140] [Impact Index Per Article: 10.8] [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: 08/03/2011] [Accepted: 10/15/2011] [Indexed: 01/06/2023] Open
Abstract
The "Function to Find Domain" (FIIND)-containing proteins CARD8 (Cardinal; Tucan) and NLRP1 (NALP1; NAC) are well known components of inflammasomes, multiprotein complexes responsible for activation of caspase-1, a regulator of inflammation and innate immunity. Although identified many years ago, the role of the FIIND is unknown. Here, we report that CARD8 and NLRP1 undergo autoproteolytic cleavage at a conserved SF/S motif within the FIIND. Using bioinformatics and computational modeling approaches, we detected striking structural similarity between the FIIND and the ZU5-UPA domain present in the autoproteolytic protein PIDD. This allowed us to generate a three-dimensional model and to gain insights in the molecular mechanism of the cleavage. Site-directed mutagenesis experiments revealed that the second serine of the SF/S motif is required for CARD8 and NLRP1 autoproteolysis. Furthermore, we discovered an important function for conserved glutamic acid and histidine residues, located in proximity of the cleavage site in regulating the autoprocessing efficiency. Altogether, these results identify a function for the FIIND and show that CARD8 and NLRP1 are ZU5-UPA domain-containing autoproteolytic proteins, thus suggesting a novel mechanism for regulating innate immune responses.
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Affiliation(s)
- Andrea D'Osualdo
- Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
| | - Christian X. Weichenberger
- Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
- Department of Pharmacology, University of California San Diego, La Jolla, California, United States of America
- Center for Biomedicine, European Academy of Bozen/Bolzano (EURAC), Bolzano, Italy
| | - Roland N. Wagner
- Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
| | - Adam Godzik
- Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
| | - John Wooley
- Department of Pharmacology, University of California San Diego, La Jolla, California, United States of America
| | - John C. Reed
- Sanford-Burnham Medical Research Institute, La Jolla, California, United States of America
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Iashin DV, Sashchenko LP, Gnuchev NV, Georgiev GP. [Wars of cells with the use of nanoweapons]. Biofizika 2011; 56:857-862. [PMID: 22117442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Some mechanisms of the antitumor action of the protein Tag7 have been considered, and three scenarios of the manifestation of cytotoxic effects during the formation of its complex with other proteins have been considered.
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Roder G, Geironson L, Rasmussen M, Harndahl M, Buus S, Paulsson K. Tapasin discriminates peptide-human leukocyte antigen-A*02:01 complexes formed with natural ligands. J Biol Chem 2011; 286:20547-57. [PMID: 21518758 PMCID: PMC3121515 DOI: 10.1074/jbc.m111.230151] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Revised: 04/12/2011] [Indexed: 11/06/2022] Open
Abstract
A plethora of peptides are generated intracellularly, and most peptide-human leukocyte antigen (HLA)-I interactions are of a transient, unproductive nature. Without a quality control mechanism, the HLA-I system would be stressed by futile attempts to present peptides not sufficient for the stable peptide-HLA-I complex formation required for long term presentation. Tapasin is thought to be central to this essential quality control, but the underlying mechanisms remain unknown. Here, we report that the N-terminal region of tapasin, Tpn(1-87), assisted folding of peptide-HLA-A*02:01 complexes according to the identity of the peptide. The facilitation was also specific for the identity of the HLA-I heavy chain, where it correlated to established tapasin dependence hierarchies. Two large sets of HLA-A*02:01 binding peptides, one extracted from natural HLA-I ligands from the SYFPEITHI database and one consisting of medium to high affinity non-SYFPEITHI ligands, were studied in the context of HLA-A*02:01 binding and stability. We show that the SYFPEITHI peptides induced more stable HLA-A*02:01 molecules than the other ligands, although affinities were similar. Remarkably, Tpn(1-87) could functionally discriminate the selected SYFPEITHI peptides from the other peptide binders with high sensitivity and specificity. We suggest that this HLA-I- and peptide-specific function, together with the functions exerted by the more C-terminal parts of tapasin, are major features of tapasin-mediated HLA-I quality control. These findings are important for understanding the biogenesis of HLA-I molecules, the selection of presented T-cell epitopes, and the identification of immunogenic targets in both basic research and vaccine design.
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Affiliation(s)
- Gustav Roder
- From the Laboratory of Experimental Immunology, Institute of International Health, Immunology and Microbiology, University of Copenhagen, Panum DK-2200 Copenhagen, Denmark and
| | - Linda Geironson
- the Immunology Section, Department of Experimental Medical Sciences, Lund University, SE-221 84 Lund, Sweden
| | - Michael Rasmussen
- From the Laboratory of Experimental Immunology, Institute of International Health, Immunology and Microbiology, University of Copenhagen, Panum DK-2200 Copenhagen, Denmark and
| | - Mikkel Harndahl
- From the Laboratory of Experimental Immunology, Institute of International Health, Immunology and Microbiology, University of Copenhagen, Panum DK-2200 Copenhagen, Denmark and
| | - Søren Buus
- From the Laboratory of Experimental Immunology, Institute of International Health, Immunology and Microbiology, University of Copenhagen, Panum DK-2200 Copenhagen, Denmark and
| | - Kajsa Paulsson
- From the Laboratory of Experimental Immunology, Institute of International Health, Immunology and Microbiology, University of Copenhagen, Panum DK-2200 Copenhagen, Denmark and
- the Immunology Section, Department of Experimental Medical Sciences, Lund University, SE-221 84 Lund, Sweden
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32
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Yashin DV, Dukhanina EA, Kabanova OD, Romanova EA, Lukyanova TI, Tonevitskii AG, Raynes DA, Gnuchev NV, Guerriero V, Georgiev GP, Sashchenko LP. The heat shock-binding protein (HspBP1) protects cells against the cytotoxic action of the Tag7-Hsp70 complex. J Biol Chem 2011; 286:10258-64. [PMID: 21247889 PMCID: PMC3060480 DOI: 10.1074/jbc.m110.163436] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2010] [Revised: 12/22/2010] [Indexed: 01/02/2023] Open
Abstract
Heat shock-binding protein HspBP1 is a member of the Hsp70 co-chaperone family. The interaction between HspBP1 and the ATPase domain of the major heat shock protein Hsp70 up-regulates nucleotide exchange and reduces the affinity between Hsp70 and the peptide in its peptide-binding site. Previously we have shown that Tag7 (also known as peptidoglycan recognition protein PGRP-S), an innate immunity protein, interacts with Hsp70 to form a stable Tag7-Hsp70 complex with cytotoxic activity against some tumor cell lines. This complex can be produced in cytotoxic lymphocytes and released during interaction with tumor cells. Here the effect of HspBP1 on the cytotoxic activity of the Tag7-Hsp70 complex was examined. HspBP1 could bind not only to Hsp70, but also to Tag7. This interaction eliminated the cytotoxic activity of Tag7-Hsp70 complex and decreased the ATP concentration required to dissociate Tag7 from the peptide-binding site of Hsp70. Moreover, HspBP1 inhibited the cytotoxic activity of the Tag7-Hsp70 complex secreted by lymphocytes. HspBP1 was detected in cytotoxic CD8+ lymphocytes. This protein was released simultaneously with Tag7-Hsp70 during interaction of these lymphocytes with tumor cells. The simultaneous secretion of the cytotoxic complex with its inhibitor could be a mechanism protecting normal cells from the cytotoxic effect of this complex.
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Affiliation(s)
- Denis V. Yashin
- From the Institute of Gene Biology and
- the Centre for Medical Studies, University of Oslo, Moscow 119344, Russia
| | - Elena A. Dukhanina
- From the Institute of Gene Biology and
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences (RAS), Moscow 119344, Russia
| | | | | | | | | | | | | | - Vince Guerriero
- the Department of Animal Sciences and
- Department of Molecular and Cellular Biology, University of Arizona, Tucson, Arizona 85721, and
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Khan JM, Ranganathan S. Understanding TR binding to pMHC complexes: how does a TR scan many pMHC complexes yet preferentially bind to one. PLoS One 2011; 6:e17194. [PMID: 21364947 PMCID: PMC3043089 DOI: 10.1371/journal.pone.0017194] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2010] [Accepted: 01/22/2011] [Indexed: 01/08/2023] Open
Abstract
Understanding the basis of the binding of a T cell receptor (TR) to the peptide-MHC (pMHC) complex is essential due to the vital role it plays in adaptive immune response. We describe the use of computed binding (free) energy (BE), TR paratope, pMHC epitope, molecular surface electrostatic potential (MSEP) and calculated TR docking angle (θ) to analyse 61 TR/pMHC crystallographic structures to comprehend TR/pMHC interaction. In doing so, we have successfully demonstrated a novel/rational approach for θ calculation, obtained a linear correlation between BE and θ without any “codon” or amino acid preference, provided an explanation for TR ability to scan many pMHC ligands yet specifically bind one, proposed a mechanism for pMHC recognition by TR leading to T cell activation and illustrated the importance of the peptide in determining TR specificity, challenging the “germline bias” theory.
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MESH Headings
- Animals
- Comprehension/physiology
- Energy Metabolism/physiology
- Histocompatibility Antigens Class I/chemistry
- Histocompatibility Antigens Class I/immunology
- Histocompatibility Antigens Class I/metabolism
- Humans
- Lymphocyte Activation/immunology
- Mice
- Models, Biological
- Models, Molecular
- Multiprotein Complexes/chemistry
- Multiprotein Complexes/immunology
- Multiprotein Complexes/metabolism
- Protein Binding/physiology
- Protein Structure, Quaternary
- Protein Structure, Secondary
- Receptors, Antigen, T-Cell/agonists
- Receptors, Antigen, T-Cell/chemistry
- Receptors, Antigen, T-Cell/immunology
- Receptors, Antigen, T-Cell/metabolism
- Substrate Specificity/immunology
- T-Cell Antigen Receptor Specificity/immunology
- T-Cell Antigen Receptor Specificity/physiology
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Affiliation(s)
- Javed Mohammed Khan
- Department of Chemistry and Biomolecular Sciences and ARC Centre of Excellence in Bioinformatics, Macquarie University, Sydney, Australia
| | - Shoba Ranganathan
- Department of Chemistry and Biomolecular Sciences and ARC Centre of Excellence in Bioinformatics, Macquarie University, Sydney, Australia
- Department of Biochemistry, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
- * E-mail:
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Kambe N, Nakamura Y, Saito M, Nishikomori R. The inflammasome, an innate immunity guardian, participates in skin urticarial reactions and contact hypersensitivity. Allergol Int 2010; 59:105-13. [PMID: 20179416 DOI: 10.2332/allergolint.09-rai-0160] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2009] [Indexed: 01/25/2023] Open
Abstract
Urticarial rash, one of the clinical manifestations characteristic of cryopyrin-associated periodic syndrome (CAPS), is caused by a mutation in the gene encoding for NLRP3 (nucleotide-binding oligomerization domain, leucine-rich repeats containing family, pyrin domain containing 3). This intracellular pattern recognition receptor and its adaptor protein, called apoptosis associated speck-like protein containing a caspase-recruitment and activating domain (ASC), participate in the formation of a multi-protein complex termed the inflammasome. The inflammasome is responsible for activating caspase-1 in response to microbial and endogenous stimuli. From the analysis of cellular mechanisms of urticarial rash in CAPS, we have traced caspase-1 activated IL-1beta in CAPS to a surprising source: mast cells. Recently, two groups have generated gene-targeted mice that harbored Nlrp3 mutations. These mice had very severe phenotypes, with delayed growth and the development of dermatitis, but not urticaria. The reason for the differences in the skin manifestations observed with CAPS and these knock-in mice relates to the findings that the inflammasome also plays a role in contact hypersensitivity, and that IL-18, another cytokine involved with inflammasome-activation of caspase-1, may be a major player in dermatitis development.
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Affiliation(s)
- Naotomo Kambe
- Department of Dermatology, Chiba University Graduate School of Medicine, Chiba, Japan.
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Abstract
Inflammasomes are innate immune signaling pathways that sense pathogens and injury to direct the proteolytic maturation of inflammatory cytokines such as IL-1beta and IL-18. Among inflammasomes, the NLRP3/NALP3 inflammasome is the most studied. However, little is known on the molecular mechanisms that mediate its assembly and activation. Recent findings suggest that ROS are produced by NLRP3/NALP3 activators and are essential secondary messengers signaling NLRP3/NALP3 inflammasome activation.
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Affiliation(s)
- Fabio Martinon
- Department of Immunology and Infectious Diseases, Harvard School of Public Health, Boston, MA 02115, USA.
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36
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Lamkanfi M, Kanneganti TD. Nlrp3: an immune sensor of cellular stress and infection. Int J Biochem Cell Biol 2010; 42:792-5. [PMID: 20079456 DOI: 10.1016/j.biocel.2010.01.008] [Citation(s) in RCA: 105] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2009] [Revised: 01/05/2010] [Accepted: 01/06/2010] [Indexed: 11/18/2022]
Abstract
Innate immune cells rely on pathogen recognition receptors such as the nucleotide-binding and oligomerization domain (NOD)-like receptor (NLR) family to mount an appropriate immune response against microbial threats. The NLR protein Nlrp3 senses microbial ligands, endogenous danger signals and crystalline substances in the cytosol to trigger the assembly of a large caspase-1-activating protein complex termed the Nlrp3 inflammasome. Autoproteolytic maturation of caspase-1 zymogens in the Nlrp3 inflammasome leads to maturation and extracellular release of the pro-inflammatory cytokines interleukin (IL)-1beta and IL-18. Gain-of-function mutations in the NOD domain of Nlrp3 are associated with auto-inflammatory disorders characterized by skin rashes and prolonged episodes of fever. In addition, decreased Nlrp3 expression was recently linked with susceptibility to Crohn's disease in humans. In this review, we discuss recent developments on the role of the Nlrp3 inflammasome in innate immunity, its activation mechanisms and the auto-inflammatory disorders associated with deregulation of Nlrp3 inflammasome activity.
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Affiliation(s)
- Mohamed Lamkanfi
- Department of Biochemistry, Ghent University, VIB, B-9000 Ghent, Belgium
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37
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Abstract
The maintenance of memory CD4 T cells is crucial for the establishment of immunological memory. The Polycomb (PcG) and Trithorax group (TrxG) genes control key developmental regulators such as the homeobox genes, and these two antagonize each other in the same developmental processes. Recently, PcG gene Bmi1 has been found to control memory Th1/Th2 cell survival and TrxG gene MLL is to control the maintenance of memory Th2 cell function selectively. Therefore, in memory CD4 T cells, PcG and TrxG genes appear to control distinct processes in a distinct manner, which indicates a novel regulatory feature of the PcG/TrxG genes.
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Affiliation(s)
- Toshinori Nakayama
- Department of Immunology, Graduate School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan.
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38
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Tundup S, Pathak N, Ramanadham M, Mukhopadhyay S, Murthy KJR, Ehtesham NZ, Hasnain SE. The co-operonic PE25/PPE41 protein complex of Mycobacterium tuberculosis elicits increased humoral and cell mediated immune response. PLoS One 2008; 3:e3586. [PMID: 18974870 PMCID: PMC2570489 DOI: 10.1371/journal.pone.0003586] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2008] [Accepted: 10/08/2008] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Many of the PE/PPE proteins are either surface localized or secreted outside and are thought to be a source of antigenic variation in the host. The exact role of these proteins are still elusive. We previously reported that the PPE41 protein induces high B cell response in TB patients. The PE/PPE genes are not randomly distributed in the genome but are organized as operons and the operon containing PE25 and PPE41 genes co-transcribe and their products interact with each other. METHODOLOGY/PRINCIPAL FINDING We now describe the antigenic properties of the PE25, PPE41 and PE25/PPE41 protein complex coded by a single operon. The PPE41 and PE25/PPE41 protein complex induces significant (p<0.0001) B cell response in sera derived from TB patients and in mouse model as compared to the PE25 protein. Further, mice immunized with the PE25/PPE41 complex and PPE41 proteins showed significant (p<0.00001) proliferation of splenocyte as compared to the mice immunized with the PE25 protein and saline. Flow cytometric analysis showed 15-22% enhancement of CD8+ and CD4+ T cell populations when immunized with the PPE41 or PE25/PPE41 complex as compared to a marginal increase (8-10%) in the mice immunized with the PE25 protein. The PPE41 and PE25/PPE41 complex can also induce higher levels of IFN-gamma, TNF-alpha and IL-2 cytokines. CONCLUSION While this study documents the differential immunological response to the complex of PE and PPE vis-à-vis the individual proteins, it also highlights their potential as a candidate vaccine against tuberculosis.
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Affiliation(s)
- Smanla Tundup
- Laboratory of Molecular and Cellular Biology, Centre for DNA Fingerprinting and Diagnostics, Hyderabad, India
- Department of Biochemistry, University of Hyderabad, Hyderabad, India
| | - Niteen Pathak
- Laboratory of Molecular and Cellular Biology, Centre for DNA Fingerprinting and Diagnostics, Hyderabad, India
| | - M. Ramanadham
- Department of Biochemistry, University of Hyderabad, Hyderabad, India
| | - Sangita Mukhopadhyay
- Laboratory of Molecular and Cellular Biology, Centre for DNA Fingerprinting and Diagnostics, Hyderabad, India
| | | | | | - Seyed E. Hasnain
- Department of Biochemistry, University of Hyderabad, Hyderabad, India
- Institute of Life Sciences, HCU Campus, Hyderabad, India
- Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore, India
- * E-mail:
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39
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Forsell MNE, Dey B, Mörner A, Svehla K, O'dell S, Högerkorp CM, Voss G, Thorstensson R, Shaw GM, Mascola JR, Karlsson Hedestam GB, Wyatt RT. B cell recognition of the conserved HIV-1 co-receptor binding site is altered by endogenous primate CD4. PLoS Pathog 2008; 4:e1000171. [PMID: 18833294 PMCID: PMC2542413 DOI: 10.1371/journal.ppat.1000171] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [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: 04/07/2008] [Accepted: 09/08/2008] [Indexed: 01/23/2023] Open
Abstract
The surface HIV-1 exterior envelope glycoprotein, gp120, binds to CD4 on the target cell surface to induce the co-receptor binding site on gp120 as the initial step in the entry process. The binding site is comprised of a highly conserved region on the gp120 core, as well as elements of the third variable region (V3). Antibodies against the co-receptor binding site are abundantly elicited during natural infection of humans, but the mechanism of elicitation has remained undefined. In this study, we investigate the requirements for elicitation of co-receptor binding site antibodies by inoculating rabbits, monkeys and human-CD4 transgenic (huCD4) rabbits with envelope glycoprotein (Env) trimers possessing high affinity for primate CD4. A cross-species comparison of the antibody responses showed that similar HIV-1 neutralization breadth was elicited by Env trimers in monkeys relative to wild-type (WT) rabbits. In contrast, antibodies against the co-receptor site on gp120 were elicited only in monkeys and huCD4 rabbits, but not in the WT rabbits. This was supported by the detection of high-titer co-receptor antibodies in all sera from a set derived from human volunteers inoculated with recombinant gp120. These findings strongly suggest that complexes between Env and (high-affinity) primate CD4 formed in vivo are responsible for the elicitation of the co-receptor-site-directed antibodies. They also imply that the naïve B cell receptor repertoire does not recognize the gp120 co-receptor site in the absence of CD4 and illustrate that conformational stabilization, imparted by primary receptor interaction, can alter the immunogenicity of a type 1 viral membrane protein. A major goal of HIV-1 vaccine research is to design novel candidates capable of neutralizing the vast array of viruses circulating in the human population. One approach is to base the vaccine upon the HIV-1 outer surface envelope glycoproteins to generate antibodies. However, during persistent infection in humans, the HIV-1 envelope glycoproteins have evolved structural features that limit the elicitation of broadly neutralizing antibodies. These immune “decoys” divert the antibody response resulting in virus subpopulations that can escape the host response. A potential means by which the virus elicits these decoy responses comes as a by-product of the entry process. Binding of the HIV-1 envelope glycoproteins to the primary receptor, human CD4, induces the formation of a second co-receptor binding site on the envelope glycoproteins, which then binds to another protein required for viral entry. Antibodies to the co-receptor binding site are generally ineffective at neutralizing HIV-1 patient isolates. Here, we demonstrate the mechanism by which antibodies to the HIV-1 co-receptor binding site are elicited in animals and humans injected with HIV-1 envelope glycoproteins and describe the implications of their formation regarding natural HIV-1 infection and vaccine design.
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MESH Headings
- Animals
- Antibodies, Viral/genetics
- Antibodies, Viral/immunology
- B-Lymphocytes/immunology
- Binding Sites, Antibody/genetics
- Binding Sites, Antibody/immunology
- CD4 Antigens/genetics
- CD4 Antigens/immunology
- Cell Line
- Female
- HIV Envelope Protein gp120/genetics
- HIV Envelope Protein gp120/immunology
- HIV Infections/genetics
- HIV Infections/immunology
- HIV-1/genetics
- HIV-1/immunology
- Humans
- Macaca fascicularis
- Multiprotein Complexes/genetics
- Multiprotein Complexes/immunology
- Rabbits
- Receptors, Antigen, B-Cell/genetics
- Receptors, Antigen, B-Cell/immunology
- Species Specificity
- env Gene Products, Human Immunodeficiency Virus/genetics
- env Gene Products, Human Immunodeficiency Virus/immunology
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Affiliation(s)
- Mattias N. E. Forsell
- Vaccine Research Center, National Institutes of Health, Bethesda, Maryland, United States of America
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
- Swedish Institute for Infectious Disease Control, Solna, Sweden
| | - Barna Dey
- Vaccine Research Center, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Andreas Mörner
- Swedish Institute for Infectious Disease Control, Solna, Sweden
| | - Krisha Svehla
- Vaccine Research Center, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Sijy O'dell
- Vaccine Research Center, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Carl-Magnus Högerkorp
- Vaccine Research Center, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Gerald Voss
- GlaxoSmithKline Biologicals, Rixensart, Belgium
| | | | - George M. Shaw
- University of Alabama in Birmingham, Birmingham, Alabama, United States of America
| | - John R. Mascola
- Vaccine Research Center, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Gunilla B. Karlsson Hedestam
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Stockholm, Sweden
- Swedish Institute for Infectious Disease Control, Solna, Sweden
| | - Richard T. Wyatt
- Vaccine Research Center, National Institutes of Health, Bethesda, Maryland, United States of America
- * E-mail:
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40
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Abstract
Recognition of LPS depends on the interaction of at least three molecules forming the LPS-receptor complex. The most important ones, CD14, MD2 and Toll-like receptor (TLR) 4 share a high degree of homology between species. In the present study, we investigated the importance of species-specific restriction on the recognition of LPS using stably transfected HEK293 cell lines expressing either human or bovine LPS-receptor complex components. Species-specific MD2 appeared to confer LPS recognition, whereas species-specific CD14 only appeared to play a minor role. In addition to the recognition of LPS, there is evidence that the fusion (F) protein of respiratory syncytial virus (RSV), which is the most common viral respiratory pathogen during infancy world-wide, interacts with TLR4, and plays an important role in the initiation of the innate immune response. Our findings suggest that human and bovine RSV may activate human and bovine TLR4 receptors, respectively, in the presence of both MD2 and CD14. However, no clear role for the RSV F protein of either human or bovine RSV alone in stimulating TLR4-dependent NF-kappaB activation was observed.
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41
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Cao W, Zhang L, Rosen DB, Bover L, Watanabe G, Bao M, Lanier LL, Liu YJ. BDCA2/Fc epsilon RI gamma complex signals through a novel BCR-like pathway in human plasmacytoid dendritic cells. PLoS Biol 2008; 5:e248. [PMID: 17850179 PMCID: PMC1971124 DOI: 10.1371/journal.pbio.0050248] [Citation(s) in RCA: 125] [Impact Index Per Article: 7.8] [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: 04/11/2007] [Accepted: 07/19/2007] [Indexed: 12/15/2022] Open
Abstract
Dendritic cells are equipped with lectin receptors to sense the extracellular environment and modulate cellular responses. Human plasmacytoid dendritic cells (pDCs) uniquely express blood dendritic cell antigen 2 (BDCA2) protein, a C-type lectin lacking an identifiable signaling motif. We demonstrate here that BDCA2 forms a complex with the transmembrane adapter FcɛRIγ. Through pathway analysis, we identified a comprehensive signaling machinery in human pDCs, similar to that which operates downstream of the B cell receptor (BCR), which is distinct from the system involved in T cell receptor (TCR) signaling. BDCA2 crosslinking resulted in the activation of the BCR-like cascade, which potently suppressed the ability of pDCs to produce type I interferon and other cytokines in response to Toll-like receptor ligands. Therefore, by associating with FcɛRIγ, BDCA2 activates a novel BCR-like signaling pathway to regulate the immune functions of pDCs. Dendritic cells (DCs) are specialized sentinels in the immune system that detect invading pathogens and, upon activation, initiate immune responses. DCs express C-type lectin receptors on their surface, which facilitate antigen capture. A distinct population of DCs, called plasmacytoid DCs (pDCs), display an extraordinary ability to rapidly make huge amounts of antiviral interferon (IFN) against viral infections. Human pDCs uniquely express a C-type lectin named BDCA2 that potently regulates pDCs function, yet the mechanism of how BDCA2 transduces signals is unknown. We show here that BDCA2 forms a complex with the transmembrane adapter FcɛRIγ. Using signaling pathway analysis, we discovered a comprehensive signaling machinery in human pDCs, similar to that which operates downstream of B cell receptors (BCRs), but distinct from the pathway involved in T cell receptor signaling. By associating with FcɛRIγ, BDCA2 activates a novel BCR-like signaling pathway to regulate the immune functions of pDCs. Since several pDC receptors use this pathway to modulate IFN and cytokine responses, these findings will guide more studies on how pDCs are regulated. Such mechanisms may lead to potential therapeutic interventions in autoimmune diseases involving hyperactivated pDCs, such as systemic lupus erythematosus and psoriasis. Plasmacytoid dendritic cells (pDCs) are renowned for their production of type 1 interferon in response to viral infection, which is signified by Toll-like receptor (TLR) activation. Here, blood dendritic cell antigen 2(BDCA2), a C-type lectin receptor expressed uniquely on pDCs, is shown to block the ultimate effectors of TLR signaling via a novel pathway.
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MESH Headings
- Adaptor Proteins, Signal Transducing/immunology
- Animals
- B-Lymphocytes/immunology
- Dendritic Cells/immunology
- Humans
- Interferon Type I/immunology
- Jurkat Cells
- Lectins, C-Type/genetics
- Lectins, C-Type/immunology
- Membrane Glycoproteins/genetics
- Membrane Glycoproteins/immunology
- Mice
- Multiprotein Complexes/immunology
- NF-kappa B/immunology
- Oligonucleotide Array Sequence Analysis
- Receptors, Antigen, B-Cell/genetics
- Receptors, Antigen, B-Cell/immunology
- Receptors, IgE/genetics
- Receptors, IgE/immunology
- Receptors, Immunologic/genetics
- Receptors, Immunologic/immunology
- Signal Transduction/physiology
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Affiliation(s)
- Wei Cao
- Department of Immunology, University of Texas M. D. Anderson Cancer Center, Houston, Texas, United States of America
- * To whom correspondence should be addressed. E-mail: (WC); (YJL)
| | - Li Zhang
- Department of Biostatistics and Applied Mathematics, University of Texas M. D. Anderson Cancer Center, Houston, Texas, United States of America
| | - David B Rosen
- Department of Microbiology and Immunology, University of California at San Francisco, San Francisco, California, United States of America
- Biomedical Sciences Graduate Program, University of California at San Francisco, San Francisco, California, United States of America
- Cancer Research Institute, University of California at San Francisco, San Francisco, California, United States of America
| | - Laura Bover
- Department of Immunology, University of Texas M. D. Anderson Cancer Center, Houston, Texas, United States of America
| | - Gokuran Watanabe
- Department of Immunology, University of Texas M. D. Anderson Cancer Center, Houston, Texas, United States of America
| | - Musheng Bao
- Department of Immunology, University of Texas M. D. Anderson Cancer Center, Houston, Texas, United States of America
| | - Lewis L Lanier
- Department of Microbiology and Immunology, University of California at San Francisco, San Francisco, California, United States of America
- Biomedical Sciences Graduate Program, University of California at San Francisco, San Francisco, California, United States of America
- Cancer Research Institute, University of California at San Francisco, San Francisco, California, United States of America
| | - Yong-Jun Liu
- Department of Immunology, University of Texas M. D. Anderson Cancer Center, Houston, Texas, United States of America
- * To whom correspondence should be addressed. E-mail: (WC); (YJL)
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42
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Doisne JM, Castaigne JG, Deruyffelaere C, Dieu-Nosjean MC, Chamot C, Alcaide-Loridan C, Charron D, Al-Daccak R. The context of HLA-DR/CD18 complex in the plasma membrane governs HLA-DR-derived signals in activated monocytes. Mol Immunol 2008; 45:709-18. [PMID: 17719638 DOI: 10.1016/j.molimm.2007.07.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2006] [Revised: 07/11/2007] [Accepted: 07/16/2007] [Indexed: 02/04/2023]
Abstract
HLA-DR-derived signals in activated monocytes mediate both pro-inflammatory cytokine production and caspase-independent death, and have been postulated to play a role in inflammation and in its resolution, respectively. Herein, using the monocytic/macrophagic human cell line THP-1 primed with IFNgamma (IFNgamma-primed THP-1), we investigated how HLA-DR may integrate both signals. Our inhibition studies demonstrated that if cell death is dependent on PKCbeta activation, the induction of TNFalpha gene expression relies on PTK activation, in particular the Src family of kinases, but both cell responses implicate the beta2-integrin CD18. Accordingly, sequential immunoprecipitation experiments demonstrated that following engagement of HLA-DR on IFNgamma-primed THP-1 cells, the HLA-DR/CD18 complex physically associates with PKCbeta and with PTK. Pharmacological disruption of lipid rafts microdomains abolished the assembly of HLA-DR/CD18/PTK signaling complex, HLA-DR-mediated tyrosine activation, and the PTK-dependent TNFalpha expression in IFNgamma-primed THP-1 cells. In contrast, HLA-DR/CD18/PKCbeta complex was still formed and able to mediate cell death after cholesterol depletion of these cells. These results indicate that while the integrity of lipid rafts is necessary for the transduction of cytokine gene expression through the HLA-DR/CD18 complex, it is not necessary for the induction of the HLA-DR/CD18-dependent cell death. Thus, our study provides experimental evidence indicating the compartmentalization of HLA-DR/CD18 complex within or outside lipid rafts as a mechanism through which HLA-DR can integrate both PTK and PKCbeta signals leading to activation and death, respectively, of activated monocytes. This might provide new insights into how MHC class II signaling may regulate inflammatory response.
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Affiliation(s)
- Jean-Marc Doisne
- INSERM U662, Réponses Immunes: Régulation et Développement, Institut Universitaire d'Hématologie, Université Paris 7, Hôpital St. Louis, 1 Av Claude Vellefaux, 75010 Paris, France
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43
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Abstract
The 70-kDa heat shock protein (Hsp70) is involved in protecting the brain from a variety of insults including stroke. Although the mechanism has been largely considered to be because of its chaperone functions, recent work indicates that Hsp70 also modulates inflammatory responses. To explore how and whether Hsp70 regulate immune responses in brain ischemia, mice overexpressing Hsp70 (Hsp Tg) were subjected to 2 h middle cerebral artery occlusion, followed by 24 h reperfusion. Parallel experiments were performed using a brain inflammation model. Hsp Tg microglia cocultured with astrocytes were used to evaluate the direct effects of Hsp70 on cytotoxicity of microglia. Compared with wild-type (Wt) littermates, Hsp Tg mice showed decreased infarct size and improved neurological deficits. The number of activated microglia/macrophages were also reduced in ischemic brains of Hsp Tg mice. Similar observations were made in a model of brain inflammation that does not result in brain cell death. Overexpression of Hsp70 in microglia completely prevented microglia-induced cytotoxicity to astrocytes. Activation of the inflammatory transcription factor, nuclear factor-kappaB (NF-kappaB) was inhibited significantly in Hsp Tg mice and microglia. This was associated with decreased phosphorylation of NF-kappaB inhibitor protein, IkappaBalpha, and decreased expression of several NFkappaB-regulated genes. Co-immunoprecipitation studies revealed an interaction of Hsp70 with NF-kappaB and IkappaBalpha, but not with IkappaB kinase, IKKgamma, suggesting that Hsp70 binds to the NF-kappaB:IkappaB complex preventing IkappaB phosphorylation by IKK. The findings of the present work establish an anti-inflammatory role for Hsp70 in the context of brain ischemia as a novel mechanism of protection.
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Affiliation(s)
- Zhen Zheng
- Department of Neurology, University of California, San Francisco and the San Francisco Veterans Affairs Medical Center, San Francisco, California 94121, USA
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44
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Abstract
Immunoprecipitation (IP) uses the specificity of antibodies to isolate target proteins (antigens) out of complex sample mixtures. Three different approaches for performing IP will be discussed; traditional (classical) method, oriented affinity method and direct affinity method. The traditional method of incubating the IP antibody with the sample and sequentially binding to Protein A or G agarose beads (resin) facilitates the most efficient target antigen recovery. However, this approach results in the target protein becoming contaminated with the IP antibody that can interfere with downstream analyses. The orientated affinity method uses Protein A or G beads to serve as an anchor to which the IP antibody is crosslinked thereby preventing the antibody from co-eluting with the target protein. Similarly, the direct affinity method also immobilizes the IP antibody except in this case it is directly attached to a chemically activated support. Both methods prevent co-elution of the IP antibody enabling reuse of the immunomatrix. All three approaches have unique advantages and can also be used for co-immunoprecipitation to study protein:protein interactions and investigate the functional proteome.
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45
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Chackerian AA, Oldham ER, Murphy EE, Schmitz J, Pflanz S, Kastelein RA. IL-1 receptor accessory protein and ST2 comprise the IL-33 receptor complex. J Immunol 2007; 179:2551-5. [PMID: 17675517 DOI: 10.4049/jimmunol.179.4.2551] [Citation(s) in RCA: 400] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
IL-33 (IL-1F11) is a recently described member of the IL-1 family of cytokines that stimulates the generation of cells, cytokines, and Igs characteristic of a type 2 immune response. IL-33 mediates signal transduction through ST2, a receptor expressed on Th2 and mast cells. In this study, we demonstrate that IL-33 and ST2 form a complex with IL-1R accessory protein (IL-1RAcP), a signaling receptor subunit that is also a member of the IL-1R complex. Additionally, IL-1RAcP is required for IL-33-induced in vivo effects, and IL-33-mediated signal transduction can be inhibited by dominant-negative IL-1RAcP. The implications of this shared usage of IL-1RAcP by IL-1(alpha and beta) and IL-33 are discussed.
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Affiliation(s)
- Alissa A Chackerian
- Discovery Research, Schering-Plough Biopharma (formerly DNAX Research), Palo Alto, CA 94304, USA
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46
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Becker CE, O'Neill LAJ. Inflammasomes in inflammatory disorders: the role of TLRs and their interactions with NLRs. Semin Immunopathol 2007; 29:239-48. [PMID: 17805544 DOI: 10.1007/s00281-007-0081-4] [Citation(s) in RCA: 134] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2007] [Accepted: 07/05/2007] [Indexed: 01/01/2023]
Abstract
The innate immune system relies on a variety of pattern recognition receptors (PRRs) such as Toll-like receptors (TLRs) and NOD-like receptors (NLRs) to sense microbial structures that are present in pathogens. Various levels of crosstalk between the TLR and NLR pathways have been described, most notably the description of a molecular scaffold complex, termed the inflammasome, which requires input from both pathways and leads to the activation of the proinflammatory cytokines interleukin (IL)-1beta and IL-18. In certain cases, the inflammatory process becomes dysregulated and chronic inflammatory diseases may develop. Understanding the interactions of the TLR and NLR pathways will provide further clues to the pathogeneses of these diseases and to the development of efficient therapies to combat them.
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Affiliation(s)
- Christine E Becker
- School of Biochemistry and Immunology, Trinity College Dublin, Dublin, Ireland.
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47
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Taniguchi S, Sagara J. Regulatory molecules involved in inflammasome formation with special reference to a key mediator protein, ASC. Semin Immunopathol 2007; 29:231-8. [PMID: 17805543 DOI: 10.1007/s00281-007-0082-3] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2007] [Accepted: 07/06/2007] [Indexed: 02/07/2023]
Abstract
The recent identification of cytosolic pattern recognition receptors (PRRs) with leucine-rich repeats, which recognize pathogen-associated molecular patterns (PAMPs), has been garnering considerable attention. Activated PRRs form molecular complexes called inflammasomes, consisting of related proteins that include procaspase 1[interleukin (IL) 1beta converting enzyme (ICE)]. Inflammasomes have been shown to facilitate molecular proximity, stimulate activation of procaspase 1, which consequently produces inflammatory cytokines IL-1beta and IL-18 and ultimately lead to the initiation of innate immunity. An adaptor protein, apoptosis-associated speck-like protein containing a CARD (ASC), which recruits PRRs carrying the pyrin homologous domain (PYD) and procaspase 1 through PYD and CARD, respectively, is responsible for the formation of some inflammasomes and also activation of procaspase 1. In this review, our main attention will be directed to PYD region analysis of ASC to understand the interaction between PYD-carrying PRRs and ASC. Taking into consideration the other aspects of the ASC gene in the proapoptotic ability and down-regulation by methylation, the biological function of ASC will be discussed in relation to the epigenetic aspects of infection, inflammation, and cancer.
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Affiliation(s)
- Shun'ichiro Taniguchi
- Department of Molecular Oncology, Institute on Aging and Adaptation, Graduate School of Medicine, Shinshu University, Matsumoto, Japan.
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48
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Freche B, Reig N, van der Goot FG. The role of the inflammasome in cellular responses to toxins and bacterial effectors. Semin Immunopathol 2007; 29:249-60. [PMID: 17805541 DOI: 10.1007/s00281-007-0085-0] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2007] [Accepted: 07/06/2007] [Indexed: 02/07/2023]
Abstract
Invading pathogens are recognized by mammalian cells through dedicated receptors found either at the cell surface or in the cytoplasm. These receptors, like the trans-membrane Toll-like Receptors (TLR) or the cytosolic Nod-like Receptors (NLR), initiate innate immunity after recognition of molecular patterns found in bacteria or viruses, such as LPS, flagellin, or double-stranded RNA. Recognition of molecules produced only by a specific pathogen, such as a viral envelop protein or a bacterial adhesin does not appear to occur. Bacterial protein toxins, however, might compose an intermediate class. Considering the diversity of toxins in terms of structure, it is unlikely that cells respond to them via specific molecular recognition. It rather appears that different classes of toxins trigger cellular changes that are sensed by the cells as danger signals, such as changes in cellular ion composition after membrane perforation by pore-forming toxins or type III secretion systems. The signaling pathways triggered through toxin-induced cell alterations will likely play a role in modulating host responses to virulent bacteria. We will here describe the few studied cases in which detection of the toxin by the host cell was addressed. The review will include not only toxins but also bacteria effectors secreted by the bacterium in to the host cell cytoplasm.
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Affiliation(s)
- Barbara Freche
- Global Health Institute, Ecole Polytechnique Fédérale de Lausanne, Station 15, 1015, Lausanne, Switzerland
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49
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Tsuda N, Chang DZ, Mine T, Efferson C, García-Sastre A, Wang X, Ferrone S, Ioannides CG. Taxol Increases the Amount and T Cell–Activating Ability of Self-Immune Stimulatory Multimolecular Complexes Found in Ovarian Cancer Cells. Cancer Res 2007; 67:8378-87. [PMID: 17804754 DOI: 10.1158/0008-5472.can-07-0327] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [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] [Indexed: 11/16/2022]
Abstract
It has been proposed that chemotherapy enhances tumor antigen (TA)-specific immunity. The molecular form of TA from ovarian tumor that activates cellular immunity is unknown. We report here identification of a novel molecular form of immunogenic TA for CD8(+) cells named self-immune stimulatory multimolecular complexes (ISMMC). ISMMC consist of a molecular complex of polyosome/ribosome-bound ubiquitinated nascent HER-2 polypeptides. This complex is chaperoned by heat shock protein Gp96, which mediates ISMMC uptake by antigen-presenting cells through the scavenger receptor CD91. RNAs in ISMMC stimulate immature dendritic cells to secrete interleukin 12 and induce IFN-gamma in peripheral blood mononuclear cells. ISMMC dissociate, retrotranslocate from the lysosome to cytoplasm, and are processed to peptides by the proteasome. At subpharmacologic doses, Taxol increased the amount of ISMMC by three to four times and modified their composition by inducing the attachment of cochaperones of HSP70, such as the mitotic-phase phosphoprotein 11J. On a total protein basis, Taxol induced ISMMC, expanded more CD8(+) cells, activated more CD56(+) NKG2D(+) cells to produce IFN-gamma, and were more potent inducers of high T-cell receptor density Perforin(+) cells than native ISMMC and peptide E75. Elucidation of the composition of ISMMC and identification of adducts formed by Taxol should be important for developing molecular cancer vaccines.
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Affiliation(s)
- Naotake Tsuda
- Department of Gynecologic Oncology, The University of Texas M D Anderson Cancer Center, Houston, TX 77030, USA
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50
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Johnston JB, Rahman MM, McFadden G. Strategies that modulate inflammasomes: insights from host-pathogen interactions. Semin Immunopathol 2007; 29:261-74. [PMID: 17717669 DOI: 10.1007/s00281-007-0080-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2007] [Accepted: 07/05/2007] [Indexed: 12/18/2022]
Abstract
The innate immune system is a dynamic and complex network for recognizing and responding to cellular insult or tissue damage after infection or injury. The primary effector mechanism of innate immunity is the generation of acute and chronic inflammatory responses through regulation of the processing and activation of proinflammatory caspases, particularly caspase 1, and cytokines, most notably IL-1beta and IL-18. Inflammasomes, cytosolic multi-protein complexes that function as molecular scaffolds for caspase activation, have recently emerged as the pivotal mechanism by which host innate immune and inflammatory responses are regulated. In this review, we investigate the mechanisms by which inflammasomes are modulated, both by endogenous host systems and by microbial pathogens.
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Affiliation(s)
- James B Johnston
- Institute for Nutrisciences and Health, National Research Council Canada, Charlottetown, PE, Canada
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