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Li L, Peng X, Batliwala M, Bouvier M. Crystal structures of MHC class I complexes reveal the elusive intermediate conformations explored during peptide editing. Nat Commun 2023; 14:5020. [PMID: 37596268 PMCID: PMC10439229 DOI: 10.1038/s41467-023-40736-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 01/20/2023] [Accepted: 08/08/2023] [Indexed: 08/20/2023] Open
Abstract
Studies have suggested that MHC class I (MHC I) molecules fluctuate rapidly between numerous conformational states and these motions support peptide sampling. To date, MHC I intermediates are largely uncharacterized experimentally and remain elusive. Here, we present x-ray crystal structures of HLA-B8 loaded with 20mer peptides that show pronounced distortions at the N-terminus of the groove. Long stretches of N-terminal amino acid residues are missing in the electron density maps creating an open-ended groove. Our structures also reveal highly unusual features in MHC I-peptide interaction at the N-terminus of the groove. Molecular dynamics simulations indicate that the complexes have varying degrees of conformational flexibility in a manner consistent with the structures. We suggest that our structures have captured the remarkable molecular dynamics of MHC I-peptide interaction. The visualization of peptide-dependent conformational motions in MHC I is a major step forward in our conceptual understanding of dynamics in high-affinity peptide selection.
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Affiliation(s)
- Lenong Li
- Department of Microbiology and Immunology, University of Illinois, Chicago, IL, 60612, USA
| | - Xubiao Peng
- Center for Quantum Technology Research and Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements, School of Physics, Beijing Institute of Technology, Beijing, 100081, China
| | - Mansoor Batliwala
- Department of Microbiology and Immunology, University of Illinois, Chicago, IL, 60612, USA
| | - Marlene Bouvier
- Department of Microbiology and Immunology, University of Illinois, Chicago, IL, 60612, USA.
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2
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Li L, Peng X, Batliwala M, Bouvier M. Unusual crystal structures of MHC class I complexes reveal the elusive intermediate conformations explored during peptide editing in antigen presentation. Res Sq 2023:rs.3.rs-2500847. [PMID: 36747752 PMCID: PMC9901037 DOI: 10.21203/rs.3.rs-2500847/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Studies have suggested that MHC class I (MHC I) molecules fluctuate rapidly between conformational states as they sample peptides for potential ligands. To date, MHC I intermediates are largely uncharacterized experimentally and remain elusive. We present x-ray crystal structures of HLA-B8 loaded with 20mer peptides that show significant conformational heterogeneity at the N-terminus of the groove. Long stretches of N-terminal residues were missing in the electron density maps creating an unstructured and widely open-ended groove. Our structures also revealed highly unusual features in MHC I and peptide conformations, and in MHC I-peptide interaction at the N-terminus of the groove. Molecular dynamics simulations showed that the complexes have varying degrees of flexibility in a manner consistent with the structures. We suggest that our structures represent transient substates explored by MHC I molecules during peptide editing. The visualization of peptide-dependent conformational flexibility in MHC I groove is a major step forward in our conceptual understanding of peptide repertoire development in antigen presentation. Our study also raises questions about the role of the N-terminus of the groove in peptide editing.
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Affiliation(s)
- Lenong Li
- Department of Microbiology and Immunology, University of Illinois, Chicago, IL, 60612, USA
| | - Xubiao Peng
- Center for Quantum Technology Research and Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurements (MOE), School of Physics, Beijing Institute of Technology, Beijing 100081, China
| | - Mansoor Batliwala
- Department of Microbiology and Immunology, University of Illinois, Chicago, IL, 60612, USA
| | - Marlene Bouvier
- Department of Microbiology and Immunology, University of Illinois, Chicago, IL, 60612, USA
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3
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Abstract
SARS-CoV-2 is the virus responsible for the COVID-19 pandemic. The genome of SARS-CoV-2 encodes nine accessory proteins that are involved in host-pathogen interaction. ORF8 is unique among these accessory proteins. SARS-CoV-2 ORF8 shares a surprisingly low amino acid sequence similarity with SARS-COV ORF8 (30%), and it is presumed to have originated from bat. Studies have shown that ORF8 exerts multiple different functions that interfere with host immune responses, including the downregulation of MHC class I molecules. These functions may represent strategies of host immune evasion. The x-ray crystal structure of ORF8 revealed an immunoglobulin-like domain with several distinguishing features. To date, there are numerous unanswered questions about SARS-CoV-2 ORF8 protein and its structure-function relationship that we discuss in this mini-review. A better understanding of how ORF8 interacts with components of the immune system is needed for elucidating COVID-19 pathogenesis and to develop new avenues for the treatment of the disease.
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Affiliation(s)
| | | | - Marlene Bouvier
- Department of Microbiology and Immunology, University of Illinois at Chicago, College of Medicine, Chicago, IL, United States
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4
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Camberlein V, Fléau C, Sierocki P, Li L, Gealageas R, Bosc D, Guillaume V, Warenghem S, Leroux F, Rosell M, Cheng K, Medve L, Prigent M, Decanter M, Piveteau C, Biela A, Eveque M, Dumont J, Mpakali A, Giastas P, Herledan A, Couturier C, Haupenthal J, Lesire L, Hirsch AKH, Deprez B, Stratikos E, Bouvier M, Deprez‐Poulain R. Discovery of the First Selective Nanomolar Inhibitors of ERAP2 by Kinetic Target-Guided Synthesis. Angew Chem Int Ed Engl 2022; 61:e202203560. [PMID: 35904863 PMCID: PMC9558494 DOI: 10.1002/anie.202203560] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Indexed: 01/07/2023]
Abstract
Endoplasmic reticulum aminopeptidase 2 (ERAP2) is a key enzyme involved in the trimming of antigenic peptides presented by Major Histocompatibility Complex class I. It is a target of growing interest for the treatment of autoimmune diseases and in cancer immunotherapy. However, the discovery of potent and selective ERAP2 inhibitors is highly challenging. Herein, we have used kinetic target-guided synthesis (KTGS) to identify such inhibitors. Co-crystallization experiments revealed the binding mode of three different inhibitors with increasing potency and selectivity over related enzymes. Selected analogues engage ERAP2 in cells and inhibit antigen presentation in a cellular context. 4 d (BDM88951) displays favorable in vitro ADME properties and in vivo exposure. In summary, KTGS allowed the discovery of the first nanomolar and selective highly promising ERAP2 inhibitors that pave the way of the exploration of the biological roles of this enzyme and provide lead compounds for drug discovery efforts.
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Affiliation(s)
- Virgyl Camberlein
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Charlotte Fléau
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Pierre Sierocki
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Lenong Li
- Department of Microbiology and ImmunologyUniversity of Illinois at Chicago909 S Wolcott AvenueChicagoIL 60612USA
| | - Ronan Gealageas
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Damien Bosc
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Valentin Guillaume
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Sandrine Warenghem
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Florence Leroux
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Melissa Rosell
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Keguang Cheng
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Laura Medve
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Mathilde Prigent
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Myriam Decanter
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Catherine Piveteau
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Alexandre Biela
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Maxime Eveque
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Julie Dumont
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Anastasia Mpakali
- National Center for Scientific Research DemokritosAgia Paraskevi15341Greece
| | - Petros Giastas
- National Center for Scientific Research DemokritosAgia Paraskevi15341Greece
| | - Adrien Herledan
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Cyril Couturier
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Jörg Haupenthal
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)Helmholtz Centre for Infection Research (HZI)Campus E8 166123SaarbrückenGermany
| | - Laetitia Lesire
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Anna K. H. Hirsch
- Helmholtz Institute for Pharmaceutical Research Saarland (HIPS)Helmholtz Centre for Infection Research (HZI)Campus E8 166123SaarbrückenGermany,Department for Pharmacy, Saarland UniversityCampus E8 166123SaarbrückenGermany
| | - Benoit Deprez
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
| | - Efstratios Stratikos
- National Center for Scientific Research DemokritosAgia Paraskevi15341Greece,Laboratory of BiochemistryDepartment of ChemistryNational and Kapodistrian University of AthensPanepistimiopolisZographou15784Greece
| | - Marlene Bouvier
- Department of Microbiology and ImmunologyUniversity of Illinois at Chicago909 S Wolcott AvenueChicagoIL 60612USA
| | - Rebecca Deprez‐Poulain
- Univ. Lille, Inserm, Institut Pasteur de Lille, U1177, Drugs and Molecules for Living Systems3 rue du Pr Laguesse59000LilleFrance,European Genomic Institute for Diabetes, EGID, Pôle Recherche1 place de Verdun59045Lille CedexFrance
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5
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Camberlein V, Fleau-Tabey C, Sierocki P, Li L, Gealageas R, Bosc D, Guillaume V, Warenghem S, Leroux F, Rosell M, Cheng K, Medve L, Prigent M, Decanter M, Piveteau C, Biela A, Eveque M, Dumont J, Mpakali A, Giastas P, Herledan A, Couturier C, Haupenthal J, Lesire L, Hirsch AK, Deprez B, Stratikos E, Bouvier M, Deprez-Poulain R. Discovery of the First Selective Nanomolar Inhibitors of Endoplasmic Reticulum Aminopeptidase 2 by Kinetic Target‐Guided Synthesis. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Virgyl Camberlein
- University of Lille: Universite de Lille M2SV: Drugs and molecules for living systems Lille FRANCE
| | - Charlotte Fleau-Tabey
- University of Lille: Universite de Lille M2SV: Drugs and Molecules for Living systems Lille FRANCE
| | - Pierre Sierocki
- University of Lille: Universite de Lille M2SV: Drugs and Molecules for Living Systems LILLE FRANCE
| | - Lenong Li
- University of Illinois at Chicago Microbiology and Immunology chicago UNITED STATES
| | - Ronan Gealageas
- University of Lille: Universite de Lille M2SV: Drugs and molecules for Living Systems Lille FRANCE
| | - Damien Bosc
- University of Lille: Universite de Lille M2SV: Drugs and Molecules for Living Systems Lille FRANCE
| | - Valentin Guillaume
- Institut Pasteur de Lille M2SV: Drugs and molecules for Living Systems Lille FRANCE
| | - Sandrine Warenghem
- Institut Pasteur de Lille M2SV: Drugs and Molecules for Living Systems Lille FRANCE
| | - Florence Leroux
- INSERM U1177 Drugs and Molecules for Living Systems M2SV Drugs and Moelcules for Living Systems Lille FRANCE
| | - Melissa Rosell
- Universite de Lille M2SV: Drugs and molecules for living systems Lille FRANCE
| | - Keguang Cheng
- University of Lille: Universite de Lille M2SV: Drugs and molecules for Living systems Lille FRANCE
| | - Laura Medve
- Institut Pasteur de Lille M2SV: Drugs and Molecules for Living systems Lille FRANCE
| | - Mathilde Prigent
- Pasteur Institute Lille: Institut Pasteur de Lille M2SV: Drugs and Molecules for Living Systems FRANCE
| | - Myriam Decanter
- Pasteur Institute Lille: Institut Pasteur de Lille M2SV: Drugs and Molecules for Living Systems FRANCE
| | - Catherine Piveteau
- University of Lille: Universite de Lille M2SV: Drugs and molecules for living systems Lille FRANCE
| | - Alexandre Biela
- Institut Pasteur de Lille M2SV: Drugs and Molecules for Living Systems Lille FRANCE
| | - Maxime Eveque
- University of Lille: Universite de Lille M2SV: Drugs and Molecules for Living Systems Lille FRANCE
| | - Julie Dumont
- University of Lille: Universite de Lille M2SV: Drugs and Molecules for Living Systems Lille FRANCE
| | - Anastasia Mpakali
- National Centre for Scientific Research-Demokritos: Ethniko Kentro Ereunas Physikon Epistemon Demokritos Protein Chemistry laboratory Athens GREECE
| | - Petros Giastas
- NCSR Demokritos: Ethniko Kentro Ereunas Physikon Epistemon Demokritos Protein Chemistry laboratory Athens GREECE
| | - Adrien Herledan
- INSERM U1177 Drugs and Molecules for Living Systems M2SV: Drugs and Moelcules for Living systems Lille FRANCE
| | - Cyril Couturier
- University of Lille: Universite de Lille M2SV: Drugs and Molecules for Living Systems Lille FRANCE
| | - Jörg Haupenthal
- Helmholtz-Institut fur Pharmazeutische Forschung Saarland HIPS Saarbrücken GERMANY
| | - Laetitia Lesire
- Institut Pasteur de Lille M2SV: Drugs and Molecules for Living Systems Lille FRANCE
| | - Anna K Hirsch
- Helmholtz-Institut fur Pharmazeutische Forschung Saarland HIPS Saarbrücken GERMANY
| | - Benoit Deprez
- University of Lille: Universite de Lille M2SV: Drugs and Molecules for Living Systems Lille FRANCE
| | - Efstratios Stratikos
- National and Kapodistrian University of Athens: Ethniko kai Kapodistriako Panepistemio Athenon biochemistry Athens GREECE
| | - Marlene Bouvier
- University of Illinois at Chicago Microbiology and Immunology Chicago UNITED STATES
| | - Rebecca Deprez-Poulain
- University of Lille: Universite de Lille U1177 M2SV Drugs and molecules for Living systems 3 rue du Pr Laguesse 59000 LILLE FRANCE
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Oliveira ERA, Li L, Bouvier M. Intracellular Sequestration of the NKG2D Ligand MIC B by Species F Adenovirus. Viruses 2021; 13:1289. [PMID: 34372495 PMCID: PMC8310058 DOI: 10.3390/v13071289] [Citation(s) in RCA: 0] [Impact Index Per Article: 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] [Received: 05/14/2021] [Revised: 06/16/2021] [Accepted: 06/25/2021] [Indexed: 11/17/2022] Open
Abstract
The enteric human adenoviruses of species F (HAdVs-F), which comprise HAdV-F40 and HAdV-F41, are significant pathogens that cause acute gastroenteritis in children worldwide. The early transcription unit 3 (E3) of HAdVs-F is markedly different from that of all other HAdV species. To date, the E3 proteins unique to HAdVs-F have not been characterized and the mechanism by which HAdVs-F evade immune defenses in the gastrointestinal (GI) tract is poorly understood. Here, we show that HAdV-F41 infection of human intestinal HCT116 cells upregulated the expression of MHC class I-related chain A (MIC A) and MIC B relative to uninfected cells. Our results also showed that, for MIC B, this response did not however result in a significant increase of MIC B on the cell surface. Instead, MIC B was largely sequestered intracellularly. Thus, although HAdV-F41 infection of HCT116 cells upregulated MIC B expression, the ligand remained inside infected cells. A similar observation could not be made for MIC A in these cells. Our preliminary findings represent a novel function of HAdVs-F that may enable these viruses to evade immune surveillance by natural killer (NK) cells in the infected gut, thereby paving the way for the future investigation of their unique E3 proteins.
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Affiliation(s)
| | | | - Marlene Bouvier
- Department of Microbiology and Immunology, University of Illinois at Chicago, 909 S Wolcott Avenue, Chicago, IL 60612, USA; (E.R.A.O.); (L.L.)
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7
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Wong P, Banville J, Wexler R, Priestley E, Marinier A, Bouvier M, Gordon D, Yang J. Favorable therapeutic index of an orally-active small-molecule antagonist of the platelet protease-activated receptor-4, BMS-986141, compared with the P2Y12 antagonist ticagrelor in cynomolgus monkeys. Eur Heart J 2020. [DOI: 10.1093/ehjci/ehaa946.3380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Abstract
Introduction
BMS-986141 is an orally-active small-molecule platelet thrombin receptor antagonist selective for the protease-activated receptor-4 (PAR4), a human platelet thrombin receptor.
Purpose
This study assessed effects of BMS-986141 vs. the P2Y12 antagonist ticagrelor, a standard of care antiplatelet agent, on arterial thrombosis (AT), mesenteric bleeding time (MBT) and platelet aggregation in monkeys.
Methods
Studies were conducted in models of electrically-mediated carotid artery thrombosis and MBT in anesthetized monkeys. Monkeys were given a single oral dose of BMS-986141 (0.05, 0.1, 0.5 mg/kg) or vehicle (n=8/group). At 2 hr post-dose, in vivo AT, MBT as well as ex vivo platelet aggregation were monitored in the same animal. Ticagrelor was studied as a comparator and given as IV bolus plus infusion at 0.0023+0.017 to 0.075+0.6 (mg/kg+mg/kg/h) (n=5–6/group). Thrombus weight reduction, MBT increase over vehicle, and platelet aggregation inhibition were determined. Peak platelet aggregation responses to activation peptides selective for PAR4 (PAR4-AP, 12.5 μM) and PAR1 (PAR1-AP, 18 μM), to collagen (5 μg/ml) and to ADP (20 μM) were determined by whole blood aggregometry.
Results
BMS-986141 inhibited platelet aggregation induced by PAR4-AP in human and monkey blood in vitro with comparable IC50 of 1.8±0.3 and 1.2±0.3 nM, respectively. BMS-986141 at 0.5 mg/kg completely inhibited platelet aggregation induced by PAR4-AP but not PAR1-AP, ADP and collagen, suggesting PAR4 receptor selectivity. In the AT model, BMS-986141 at 0.05, 0.1 and 0.5 mg/kg reduced thrombus weight by 36±7*, 63±8*, and 88±3%*, respectively (*P<0.05 vs. vehicle). BMS-986141 increased MBT by up to 1.2-fold. In a separate study, ticagrelor at 0.0023+0.017, 0.0068+0.055, 0.0255+0.18 and 0.075+0.6 (mg/kg+mg/kg/h IV) reduced thrombus weight by 19±8, 36±5*, 76±6* and 89±1%*, and increased MBT by respectively by 1.7-, 6.4-*, >10-*, and >10-fold*, respectively (*P<0.05 vs. vehicle).
Conclusion
Comparable antithrombotic efficacy was observed between BMS-986141 and ticagrelor in monkeys. BMS-986141 exhibited lower MBT compared with ticagrelor at equivalent antithrombotic doses. This study suggests that PAR4 antagonism provides a potentially safer antiplatelet therapy.
Funding Acknowledgement
Type of funding source: Private company. Main funding source(s): Research was supported by Bristol-Myers Squibb
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Affiliation(s)
- P Wong
- Bristol Myers Squibb, Princeton, United States of America
| | - J Banville
- Universite de Montreal, Institute for Research in Immunology and Cancer, Montreal, Canada
| | - R Wexler
- Bristol Myers Squibb, Princeton, United States of America
| | - E Priestley
- Bristol Myers Squibb, Princeton, United States of America
| | - A Marinier
- Universite de Montreal, Institute for Research in Immunology and Cancer, Montreal, Canada
| | - M Bouvier
- Universite de Montreal, Institute for Research in Immunology and Cancer, Montreal, Canada
| | - D Gordon
- Bristol Myers Squibb, Princeton, United States of America
| | - J Yang
- Bristol Myers Squibb, Princeton, United States of America
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8
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Li L, Batliwala M, Bouvier M. ERAP1 enzyme-mediated trimming and structural analyses of MHC I-bound precursor peptides yield novel insights into antigen processing and presentation. J Biol Chem 2019; 294:18534-18544. [PMID: 31601650 PMCID: PMC6901306 DOI: 10.1074/jbc.ra119.010102] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 09/20/2019] [Indexed: 01/07/2023] Open
Abstract
Endoplasmic reticulum aminopeptidase 1 (ERAP1) and ERAP2 critically shape the major histocompatibility complex I (MHC I) immunopeptidome. The ERAPs remove N-terminal residues from antigenic precursor peptides and generate optimal-length peptides (i.e. 8-10-mers) to fit into the MHC class I groove. It is therefore intriguing that MHC class I molecules can present N-terminally extended peptides on the cell surface that can elicit CD8+ T-cell responses. This observation likely reflects gaps in our understanding of how antigens are processed by the ERAP enzymes. To better understand ERAPs' function in antigen processing, here we generated a nested set of N-terminally extended 10-20-mer peptides (RA) n AAKKKYCL covalently bound to the human leukocyte antigen (HLA)-B*0801. We used X-ray crystallography, thermostability assessments, and an ERAP1-trimming assay to characterize these complexes. The X-ray structures determined at 1.40-1.65 Å resolutions revealed that the residue extensions (RA) n unexpectedly protrude out of the A pocket of HLA-B*0801, whereas the AAKKKYCL core of all peptides adopts similar, bound conformations. HLA-B*0801 residue 62 was critical to open the A pocket. We also show that HLA-B*0801 and antigenic precursor peptides form stable complexes. Finally, ERAP1-mediated trimming of the MHC I-bound peptides required a minimal length of 14 amino acids. We propose a mechanistic model explaining how ERAP1-mediated trimming of MHC I-bound peptides in cells can generate peptides of canonical as well as noncanonical lengths that still serve as stable MHC I ligands. Our results provide a framework to better understand how the ERAP enzymes influence the MHC I immunopeptidome.
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Affiliation(s)
- Lenong Li
- Department of Microbiology and Immunology, University of Illinois, Chicago, Illinois 60612
| | - Mansoor Batliwala
- Department of Microbiology and Immunology, University of Illinois, Chicago, Illinois 60612
| | - Marlene Bouvier
- Department of Microbiology and Immunology, University of Illinois, Chicago, Illinois 60612, To whom correspondence should be addressed:
Dept. of Microbiology and Immunology, University of Illinois at Chicago, 909 S. Wolcott Ave., Chicago, IL 60612. Tel.:
312-355-0664; E-mail:
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9
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Oliveira ERA, Bouvier M. Immune evasion by adenoviruses: a window into host-virus adaptation. FEBS Lett 2019; 593:3496-3503. [PMID: 31736048 DOI: 10.1002/1873-3468.13682] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 10/31/2019] [Accepted: 11/01/2019] [Indexed: 11/09/2022]
Abstract
Human adenoviruses (HAdVs) are widespread pathogens that cause a number of partially overlapping, species-specific infections associated with respiratory, urinary, gastrointestinal, and ocular diseases. The early 3 (E3) region of adenoviruses is highly divergent between different species, and it encodes a multitude of proteins with immunomodulatory functions. The study of genetic diversity in the E3 region offers a unique opportunity to gain insight into how the various HAdVs have evolutionarily adapted in response to the selection pressures exerted by host immune defenses. The objective of this review was to discuss subversion of host antiviral immune responses by HAdVs, with a focus on suppression of MHC class I antigen presentation, as a window into host-HAdV adaptation.
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Affiliation(s)
- Edson R A Oliveira
- Department of Microbiology and Immunology, University of Illinois at Chicago, IL, USA
| | - Marlene Bouvier
- Department of Microbiology and Immunology, University of Illinois at Chicago, IL, USA
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Imam A, Winnebeck E, Buchholz N, Froguel P, Bonnefond A, Solimena M, Ivanova A, Bouvier M, Plouffe B, Charpentier G, Karamitri A, Jockers R, Roenneberg T, Vetter C. Functional circadian and sleep phenotyping of type 2 diabetes patients with melatonin receptor 2 mutations and controls: a pilot study. Sleep Med 2019. [DOI: 10.1016/j.sleep.2019.11.460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Abstract
Studies over the last decade on characterization of the major histocompatibility complex (MHC) class I antigen presentation pathway have highlighted the importance of antigen processing, peptide transport, peptide trimming, and peptide selection as key stages for the development of optimal peptide repertoires that are presented by MHC class I molecules to cytotoxic T lymphocytes (CTLs). The study of these stages and how they are regulated, is fundamental for progress in understanding the adaptive immune system. Here we describe an in vitro assay monitoring peptide trimming by the human endoplasmic reticulum amino peptidases 1 (ERAP1) and ERAP2 (ERAPs) as a tool to characterize trimming events and gain a better understanding of the role and function of ERAPs in peptide repertoire development. Specifically, our assay allows for monitoring trimming of free but also of MHC I-bound peptides which may reflect the physiological situation best.
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Affiliation(s)
- Mirjana Weimershaus
- INSERM U1151, Université Paris Descartes, Hopital Necker-Enfants Malades, Paris, France
- Institut IMAGINE, INSERM U1163, Paris, France
- Centre for Research on Inflammation, INSERM, U1149, Paris, France
| | - Irini Evnouchidou
- Faculté de Médecine, CNRS, UMR8253, Université Paris Descartes, INSERM, U1151, Paris, France
- Inovarion SAS, Paris, France
| | - Lenong Li
- Department of Microbiology and Immunology, College of Medicine, University of Illinois at Chicago, Chicago, IL, USA
| | - Peter van Endert
- INSERM U1151, Université Paris Descartes, Hopital Necker-Enfants Malades, Paris, France
| | - Marlene Bouvier
- Department of Microbiology and Immunology, College of Medicine, University of Illinois at Chicago, Chicago, IL, USA.
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Ren J, Dsouza NR, Deng H, Lee H, Bouvier M, Johnson ME. Discovery of small molecule inhibitors of adenovirus by disrupting E3-19K/HLA-A2 interactions. Bioorg Med Chem Lett 2018; 28:2837-2841. [PMID: 30077568 DOI: 10.1016/j.bmcl.2018.07.036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2018] [Revised: 07/24/2018] [Accepted: 07/26/2018] [Indexed: 11/30/2022]
Abstract
The binding of the adenovirus (Ad) protein E3-19K with the human leukocyte antigen (HLA) plays an important role in Ad infections, which is the causative agent of a series of gastrointestinal, respiratory and ocular diseases. The objective of this research is to evaluate the essential interactions between E3-19K and HLA-A2 using the X-ray crystal structure of the E3-19K/HLA-A2 complex, and to identify small molecules that could potentially disrupt their binding. Computational methods, including molecular dynamic simulations, MM/GBSA calculations, and computational solvent mapping, were implemented to determine potential binding site(s) for small molecules. The previous experimentally determined hot spot residues, Q54 and E177 in HLA-A2, were also predicted to be the dominant residues for binding to E3-19K by our theoretical calculations. Several other residues were also found to play pivotal roles for the binding of E3-19K with HLA-A2. Residues adjacent to E177, including Q54 and several other residues theoretically predicted to be crucial in HLA-A2 were selected as a potential binding pocket to perform virtual screening with 1200 compounds from the Prestwick library. Seven hits were validated by surface plasmon resonance (SPR) as binders to HLA-A2 as a first step in identifying molecules that can perturb its association with the Ad E3-19K protein.
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Affiliation(s)
- Jinhong Ren
- Center for Biomolecular Sciences, University of Illinois at Chicago, 900 S. Ashland Ave, Chicago, IL 60607, USA
| | - Nikita R Dsouza
- Department of Bioengineering, University of Illinois at Chicago, 835 S Wolcott Ave, Chicago, IL 60612, USA
| | - Hui Deng
- Department of Microbiology and Immunology, University of Illinois at Chicago, 835 S. Wolcott Ave, Chicago, IL 60612, USA
| | - Hyun Lee
- Center for Biomolecular Sciences, University of Illinois at Chicago, 900 S. Ashland Ave, Chicago, IL 60607, USA; Department of Medicinal Chemistry and Pharmacognosy, University of Illinois at Chicago, 900 S. Ashland Ave, Chicago, IL 60607, USA; Biophysics Core, Research Resources Center, University of Illinois at Chicago, 1100 S. Ashland Ave, Chicago, IL 60607, USA
| | - Marlene Bouvier
- Department of Microbiology and Immunology, University of Illinois at Chicago, 835 S. Wolcott Ave, Chicago, IL 60612, USA
| | - Michael E Johnson
- Center for Biomolecular Sciences, University of Illinois at Chicago, 900 S. Ashland Ave, Chicago, IL 60607, USA; Department of Bioengineering, University of Illinois at Chicago, 835 S Wolcott Ave, Chicago, IL 60612, USA; Department of Medicinal Chemistry and Pharmacognosy, University of Illinois at Chicago, 900 S. Ashland Ave, Chicago, IL 60607, USA.
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13
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Bouvier M, Li L, Deng H. Subversion of antigen presentation by Adenoviruses. The Journal of Immunology 2018. [DOI: 10.4049/jimmunol.200.supp.99.26] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
The cell-surface presentation of viral antigens by MHC class I molecules to CD8+ T-cells is critical for eliminating virus-infected cells. In turn, viruses have evolved numerous strategies to interfere with the generation and presentation of class I antigens. Human adenoviruses (Ads) comprise more than 70 different types classified into seven species (A to G); Ad infections cause diseases of the respiratory track (species B, C, and E), eyes (species D), and gastrointestinal track (species F). Ads encode the E3-19K protein that targets MHC class I molecules for retention in the endoplasmic reticulum of infected cells, thereby suppressing cell-surface presentation of Ad-derived antigens. In recent years, we determined the x-ray structures of Ad2 (species C) and Ad4 (species E) E3-19K bound to HLA-A2, which together with biochemical and functional data allowed to explain the mechanism of immunomodulation. Interestingly, in comparison to other Ads, species F Ads lack a gene for the common E3-19K protein and instead have two unique and uncharacterized genes, E3-19.4K and -31.6K. We are using a biochemical and functional approach to investigate how species F Ads modulate various cell surface immune proteins, including MHC I molecules, and what role of E3-19.4K and -31.6K proteins play in these effects.
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14
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Vitton V, Benezech A, Bouvier M. High-resolution anorectal manometry may probably be worth every penny. Neurogastroenterol Motil 2018; 30. [PMID: 29265640 DOI: 10.1111/nmo.13217] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Accepted: 08/31/2017] [Indexed: 02/08/2023]
Affiliation(s)
- V Vitton
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique - Hôpitaux de Marseille, Marseille, France.,Plateforme d'Interface Clinique, CRN2M CNRS UMR 7286, Aix-Marseille Université, Marseille, France
| | - A Benezech
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique - Hôpitaux de Marseille, Marseille, France
| | - M Bouvier
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique - Hôpitaux de Marseille, Marseille, France.,Plateforme d'Interface Clinique, CRN2M CNRS UMR 7286, Aix-Marseille Université, Marseille, France
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Bouvier M, Miszczycha SD, Guillarme X, Tadla C, Collinet L, Sergentet DT. Comparative Evaluation of a Novel Phage Protein Ligand Assay and Immunomagnetic Separation Method To Isolate the Seven Top Serogroups of Escherichia coli (O157, O26, O103, O145, O111, O45, and O121) in Foods at Risk. J Food Prot 2017; 80:1973-1979. [PMID: 29130763 DOI: 10.4315/0362-028x.jfp-16-479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The presence of Shiga toxin-producing Escherichia coli (STEC) in food is a major concern for food safety authorities and industries. Methods for detecting these pathogenic bacteria are crucial. Enrichment of foods for STEC identification has been optimized, but selective concentration of bacteria before isolation still needs to be improved. In the present study, we tested the performance of the VIDAS ESPT detection method against that of the immunomagnetic separation (IMS) method. A preenrichment inoculation was performed to provide a realistic scenario of the contamination that occurs in foods, and the methods were then compared. Results obtained were then confirmed in naturally contaminated foods. Preenrichment inoculation assays revealed that the novel concentration method using phage recombinant proteins or the selective capture of the target top seven STEC serogroups is as specific and sensitive as IMS. Subsequent evaluation of naturally contaminated samples confirmed that the novel concentration method and IMS are equivalent in performance under the conditions tested.
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Affiliation(s)
- M Bouvier
- 1 Research Group on Bacterial Opportunistic Pathogens and Environmental and Biological Resource Centre, Environmental Microbiology Lyon, UMR5557 Microbial Ecology, Centre National de la Recherche Scientifique, VetAgro Sup and Université Lyon 1, Villeurbanne, France; and.,2 Laboratoire d'étude des microorganismes alimentaires pathogènes, National Reference Laboratory for Shiga Toxin-Producing Escherichia coli, VetAgro Sup Campus Vétérinaire de Lyon, F-63280 Marcy L'Étoile, France
| | - S D Miszczycha
- 1 Research Group on Bacterial Opportunistic Pathogens and Environmental and Biological Resource Centre, Environmental Microbiology Lyon, UMR5557 Microbial Ecology, Centre National de la Recherche Scientifique, VetAgro Sup and Université Lyon 1, Villeurbanne, France; and
| | - X Guillarme
- 2 Laboratoire d'étude des microorganismes alimentaires pathogènes, National Reference Laboratory for Shiga Toxin-Producing Escherichia coli, VetAgro Sup Campus Vétérinaire de Lyon, F-63280 Marcy L'Étoile, France
| | - C Tadla
- 2 Laboratoire d'étude des microorganismes alimentaires pathogènes, National Reference Laboratory for Shiga Toxin-Producing Escherichia coli, VetAgro Sup Campus Vétérinaire de Lyon, F-63280 Marcy L'Étoile, France
| | - L Collinet
- 2 Laboratoire d'étude des microorganismes alimentaires pathogènes, National Reference Laboratory for Shiga Toxin-Producing Escherichia coli, VetAgro Sup Campus Vétérinaire de Lyon, F-63280 Marcy L'Étoile, France
| | - D Thevenot Sergentet
- 1 Research Group on Bacterial Opportunistic Pathogens and Environmental and Biological Resource Centre, Environmental Microbiology Lyon, UMR5557 Microbial Ecology, Centre National de la Recherche Scientifique, VetAgro Sup and Université Lyon 1, Villeurbanne, France; and.,2 Laboratoire d'étude des microorganismes alimentaires pathogènes, National Reference Laboratory for Shiga Toxin-Producing Escherichia coli, VetAgro Sup Campus Vétérinaire de Lyon, F-63280 Marcy L'Étoile, France
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Cahill T, Thomsen A, Plouffe B, Bouvier M, Lefkowitz R. LB987 New insights into gpcr-transducer coupling. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.07.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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17
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Mion F, Garros A, Brochard C, Vitton V, Ropert A, Bouvier M, Damon H, Siproudhis L, Roman S. 3D High-definition anorectal manometry: Values obtained in asymptomatic volunteers, fecal incontinence and chronic constipation. Results of a prospective multicenter study (NOMAD). Neurogastroenterol Motil 2017; 29. [PMID: 28251732 DOI: 10.1111/nmo.13049] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Accepted: 01/13/2017] [Indexed: 12/12/2022]
Abstract
BACKGROUND 3D-high definition anorectal manometry (3DARM) may aid the diagnosis of functional anorectal disorders, but data comparing asymptomatic and symptomatic subjects are scarce. We aimed to describe 3DARM values in asymptomatic volunteers and those with fecal incontinence (FI) or chronic constipation (CC), and identify which variables differentiate best these groups. METHODS Asymptomatic subjects were stratified by sex, age, and parity. Those with FI or CC were included according to anorectal symptom questionnaires. Endoanal ultrasound examination and 3DARM were performed the same day. Anal pressures were analyzed at rest, during voluntary squeeze, and during push maneuver, and compared between the 3 groups. Anal pressure defects were defined and compared to ultrasound defects. KEY RESULTS A total of 126 subjects (113 female, mean age 52 years, range 18-83) were included; 36 asymptomatic, 38 FI, 42 CC. Anal resting and squeeze pressures, and rectal sensitivity values were lower in FI women than in the other groups. Typical anal sphincter asymmetry during squeezing was less frequently observed in FI women. A dyssynergic pattern during push maneuver was found in 70% of asymptomatic subjects, and with a similar frequency in the 2 symptomatic groups. There was slight concordance between 3D-pressure defects and ultrasound defects. CONCLUSIONS & INFERENCES 3D anal pressures in asymptomatic women were significantly lower than in men, and in FI compared to asymptomatic women. The classical dyssynergic pattern during push maneuver was found as frequently in asymptomatic and symptomatic patients. Further studies should try to identify 3DARM variables that could reliably identify dyssynergic defecation.
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Affiliation(s)
- F Mion
- Exploration Fonctionnelle Digestive, Hospital Edouard Herriot, Hospices Civils de Lyon, Lyon I University, and INSERM 1032 LabTAU, Lyon, France
| | - A Garros
- Exploration Fonctionnelle Digestive, Hospital Edouard Herriot, Hospices Civils de Lyon, Lyon, France
| | - C Brochard
- Digestive Physiology and Gastroenterology, Pontchaillou Hospital, CHU de Rennes, Rennes, France
| | - V Vitton
- Digestive Physiology, North Hospital, Assistance Publique Hôpitaux de Marseille, Aix-Marseille University, Marseille, France
| | - A Ropert
- Digestive Physiology and Gastroenterology, Pontchaillou Hospital, CHU de Rennes, Rennes, France
| | - M Bouvier
- Digestive Physiology, North Hospital, Assistance Publique Hôpitaux de Marseille, Aix-Marseille University, Marseille, France
| | - H Damon
- Exploration Fonctionnelle Digestive, Hospital Edouard Herriot, Hospices Civils de Lyon, Lyon, France
| | - L Siproudhis
- Digestive Physiology and Gastroenterology, Pontchaillou Hospital, CHU de Rennes, Rennes, France
| | - S Roman
- Exploration Fonctionnelle Digestive, Hospital Edouard Herriot, Hospices Civils de Lyon, Lyon I University, and INSERM 1032 LabTAU, Lyon, France
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Benezech A, Cappiello M, Baumstarck K, Grimaud JC, Bouvier M, Vitton V. Rectal intussusception: can high resolution three-dimensional ano-rectal manometry compete with conventional defecography? Neurogastroenterol Motil 2017; 29. [PMID: 27891706 DOI: 10.1111/nmo.12978] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2016] [Accepted: 09/21/2016] [Indexed: 12/24/2022]
Abstract
BACKGROUND Three-dimensional high-resolution anorectal manometry (3DHRAM), used for exploring anorectal disorders, was recently developed, providing interesting topographic data for the diagnosis of pelvic floor disorders such as excessive perineal descent. The aim of our study was to define a diagnostic strategy based on selected 3DHRAM parameters to identify rectal intussusceptions (RI), considering conventional defecography (CD) as the gold standard. METHODS All patients referred to our center in the previous 6 months for 3DHRAM to explore fecal incontinence or constipation, and who previously achieved CD, were eligible. 3DHRAM results were obtained for all classical parameters and the presence of a narrow band of high pressure in the anal canal during attempted defecation, which was recently found to be associated with RI in some studies. The sensitivity, specificity, and positive and negative predictive values were calculated for various 3DHRAM criterion in order to propose a diagnostic strategy for RI. KEY RESULTS Twenty-six patients (66%) presented with RI on CD. On 3DHRAM, according to our diagnostic strategy, the most relevant manometric criterion for the diagnosis of RI was the association of an anterior additional high-pressure area and an excessive perineal descent, with a positive predictive value of 100% [81.5-100], a specificity of 100% [75.3-100] and a sensibility of 69.2% [48.2-85.7]. CONCLUSIONS & INFERENCES In this study, 3DHRAM was used to diagnose RI, and we confirmed its use in the diagnosis of pelvic floor disorders. Further studies will be necessary to define classifications for these new anatomic data from 3DHRAM.
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Affiliation(s)
- A Benezech
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Marseille, France.,Plateforme d'interface clinique, CRN2M CNRS UMR 7286, Aix-Marseille Université, Marseille, France
| | - M Cappiello
- Service de Gastroentérologie, Centre Hospitalier Général de Martigues, Martigues, France
| | - K Baumstarck
- Unité d'Aide Méthodologique à la Recherche Clinique, EA 3279, Laboratoire de Santé Publique, Aix-Marseille Université, Marseille, France
| | - J-C Grimaud
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Marseille, France.,Plateforme d'interface clinique, CRN2M CNRS UMR 7286, Aix-Marseille Université, Marseille, France
| | - M Bouvier
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Marseille, France.,Plateforme d'interface clinique, CRN2M CNRS UMR 7286, Aix-Marseille Université, Marseille, France
| | - V Vitton
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Marseille, France.,Plateforme d'interface clinique, CRN2M CNRS UMR 7286, Aix-Marseille Université, Marseille, France
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Calderón MA, Vidal C, Rodríguez del Río P, Just J, Pfaar O, Tabar AI, Sánchez-Machín I, Bubel P, Borja J, Eberle P, Reiber R, Bouvier M, Lepelliez A, Klimek L, Demoly P. European Survey on Adverse Systemic Reactions in Allergen Immunotherapy (EASSI): a real-life clinical assessment. Allergy 2017; 72:462-472. [PMID: 27718250 DOI: 10.1111/all.13066] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/05/2016] [Indexed: 12/14/2022]
Abstract
BACKGROUND Outside clinical trials, data on systemic reactions (SRs) due to allergen immunotherapy (AIT) are scarce. METHODS A prospective, longitudinal, web-based survey of 'real-life' respiratory allergen immunotherapy (AIT) clinical practice was conducted in France, Germany and Spain. SRs were recorded and coded according to the Medical Dictionary for Regulatory Activities (MedDRA) and risk factors associated with SRs were identified. RESULTS A total of 4316 patients (corresponding to 4363 ongoing courses of AIT) were included. A total of 109 SRs were recorded, and 90 patients (2.1%) presented at least one SR. Most of the SRs occurred in subcutaneous allergen immunotherapy (SCIT) (89%, n = 97). The most frequently reported symptoms were urticaria, rhinitis, dyspnoea and cough. Respiratory symptoms appeared before skin symptoms. Most SRs occurred during the up-dosing phase (75.8%) and were mild in severity (71.6%). Intramuscular adrenaline was administered in 17 SRs, but only 65% of these were subsequently classified as anaphylaxis. Independent risk factors for SRs during SCIT were as follows: the use of natural extracts (odds ratio, OR) [95% confidence interval (CI)] = 2.74 [1.61-4.87], P = 0.001), the absence of symptomatic allergy medications (1.707 [1.008-2.892], P = 0.047), asthma diagnosis (1.74 [1.05-2.88], P = 0.03), sensitization to animal dander (1.93 [1.21-3.09], P = 0.006) or pollen (1.16 [1.03-1.30], P = 0.012) and cluster regimens (vs rush) (4.18 [1.21-14.37], P = 0.023). A previous episode of anaphylaxis increased the risk for anaphylaxis in SCIT (OR [95% CI] = 17.35 [1.91-157.28], P = 0.01). CONCLUSION AIT for respiratory allergy is safe, with a low number of SRs observed in real-life clinical practice. A personalized analysis of risk factors could be used to minimize SRs.
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Affiliation(s)
- M. A. Calderón
- Section of Allergy and Clinical Immunology; Imperial College London; National Heart and Lung Institute; Royal Brompton Hospital; London UK
| | - C. Vidal
- Allergy Department; Complejo Hospitalario Universitario de Santiago; Santiago de Compostela Spain
| | | | - J. Just
- Service d'Allergologie; Centre de l'Asthme et des Allergies; Hôpital d'Enfants Armand-Trousseau (APHP)-Sorbonne Universités; UPMC Univ Paris 06; UMR-S 1136; Institut Pierre Louis d'Epidémiologie et de Santé Publique; Equipe EPAR; Paris France
| | - O. Pfaar
- Center for Rhinology and Allergology; Wiesbaden Germany
- Department of Otorhinolaryngology, Head and Neck Surgery; Universitätsmedizin Mannheim; Medical Faculty Mannheim; Heidelberg University; Mannheim Germany
| | - A. I. Tabar
- Allergy Department; Complejo Hospitalario de Navarra; Pamplona Spain
| | - I. Sánchez-Machín
- Allergy Management Unit; Hospital del Tórax; Complejo Hospital Universitario Nuestra Señora de Candelaria; Santa Cruz de Tenerife Spain
| | - P. Bubel
- Ear, Nose and Throat Practice; Lutherstadt, Eisleben Germany
| | - J. Borja
- Allergy Section; Hospital General Universitario; Ciudad Real Spain
| | | | - R. Reiber
- Otorhinolaryngology and Allergology Center Schorndorf-Nord; Schorndorf Germany
| | - M. Bouvier
- Allergology and Immunology Clinique; University Claude Bernard; Lyon France
| | | | - L. Klimek
- Center for Rhinology and Allergology; Wiesbaden Germany
| | - P. Demoly
- Département de Pneumologie et Addictologie; Hôpital Arnaud de Villeneuve; University Hospital of Montpellier; Sorbonne Universités; UPMC Paris 06; UMR-S 1136; Institut Pierre Louis d'Epidémiologie et de Santé Publique; Equipe EPAR; Paris France
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Li L, Santarsiero BD, Bouvier M. Structure of the Adenovirus Type 4 (Species E) E3-19K/HLA-A2 Complex Reveals Species-Specific Features in MHC Class I Recognition. J Immunol 2016; 197:1399-407. [PMID: 27385781 PMCID: PMC4975982 DOI: 10.4049/jimmunol.1600541] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Accepted: 06/02/2016] [Indexed: 01/07/2023]
Abstract
Adenoviruses (Ads) subvert MHC class I Ag presentation and impair host anti-Ad cellular activities. Specifically, the Ad-encoded E3-19K immunomodulatory protein targets MHC class I molecules for retention within the endoplasmic reticulum of infected cells. We report the x-ray crystal structure of the Ad type 4 (Ad4) E3-19K of species E bound to HLA-A2 at 2.64-Å resolution. Structural analysis shows that Ad4 E3-19K adopts a tertiary fold that is shared only with Ad2 E3-19K of species C. A comparative analysis of the Ad4 E3-19K/HLA-A2 structure with our x-ray structure of Ad2 E3-19K/HLA-A2 identifies species-specific features in HLA-A2 recognition. Our analysis also reveals common binding characteristics that explain the promiscuous, and yet high-affinity, association of E3-19K proteins with HLA-A and HLA-B molecules. We also provide structural insights into why E3-19K proteins do not associate with HLA-C molecules. Overall, our study provides new information about how E3-19K proteins selectively engage with MHC class I to abrogate Ag presentation and counteract activation of CD8(+) T cells. The significance of MHC class I Ag presentation for controlling viral infections, as well as the threats of viral infections in immunocompromised patients, underline our efforts to characterize viral immunoevasins, such as E3-19K.
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Affiliation(s)
- Lenong Li
- Department of Microbiology and Immunology, University of Illinois, Chicago, IL, USA
| | - Bernard D. Santarsiero
- Department of Medicinal Chemistry and Pharmacognosy, and Center for Molecular Biosciences, Chicago, IL, USA
| | - Marlene Bouvier
- Department of Microbiology and Immunology, University of Illinois, Chicago, IL, USA
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Chen H, Li L, Weimershaus M, Evnouchidou I, van Endert P, Bouvier M. ERAP1-ERAP2 dimers trim MHC I-bound precursor peptides; implications for understanding peptide editing. Sci Rep 2016; 6:28902. [PMID: 27514473 PMCID: PMC4981824 DOI: 10.1038/srep28902] [Citation(s) in RCA: 69] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 06/10/2016] [Indexed: 01/10/2023] Open
Abstract
The processing of MHC class I antigenic precursor peptides by the endoplasmic reticulum aminopeptidase 1 (ERAP1) and ERAP2 is an important event in the cell biology of antigen presentation. To date, the molecular context by which the ERAP enzymes trim precursor peptides, and how ERAPs shape peptide repertoires, remain open questions. Using ERAP1 and ERAP2 heterodimers (ERAP1/2), and N-terminally extended model and natural peptides in their free and HLA-B*0801-bound forms, we characterized the mode of action of ERAPs. We provide evidence that ERAP1/2 can trim MHC I-bound precursor peptides to their correct and final lengths, albeit more slowly than the corresponding free precursors. Trimming of MHC I-bound precursors by ERAP1/2 increases the conformational stability of MHC I/peptide complexes. From the data, we propose a molecular mechanistic model of ERAP1/2 as peptide editors. Overall, our study provides new findings on a significant issue of the ERAP-mediated processing pathway of MHC class I antigens.
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Affiliation(s)
- Hanna Chen
- Department of Microbiology and Immunology, University of Illinois at Chicago, College of Medicine, Chicago, IL 60612 USA
| | - Lenong Li
- Department of Microbiology and Immunology, University of Illinois at Chicago, College of Medicine, Chicago, IL 60612 USA
| | - Mirjana Weimershaus
- INSERM, Unité 1151; CNRS, Unité 8352; Université Paris Descartes, 75015 Paris, France
| | - Irini Evnouchidou
- INSERM, Unité 1151; CNRS, Unité 8352; Université Paris Descartes, 75015 Paris, France
| | - Peter van Endert
- INSERM, Unité 1151; CNRS, Unité 8352; Université Paris Descartes, 75015 Paris, France
| | - Marlene Bouvier
- Department of Microbiology and Immunology, University of Illinois at Chicago, College of Medicine, Chicago, IL 60612 USA
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Ropagnol X, Khorasaninejad M, Raeiszadeh M, Safavi-Naeini S, Bouvier M, Côté CY, Laramée A, Reid M, Gauthier MA, Ozaki T. Intense THz Pulses with large ponderomotive potential generated from large aperture photoconductive antennas. Opt Express 2016; 24:11299-11311. [PMID: 27410061 DOI: 10.1364/oe.24.011299] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the generation of free space terahertz (THz) pulses with energy up to 8.3 ± 0.2 µJ from an encapsulated interdigitated ZnSe Large Aperture Photo-Conductive Antenna (LAPCA). An aperture of 12.2 cm2 is illuminated using a 400 nm pump laser with multi-mJ energies at 10 Hz repetition rate. The calculated THz peak electric field is 331 ± 4 kV/cm with a spectrum characterized by a median frequency of 0.28 THz. Given its relatively low frequency, this THz field will accelerate charged particles efficiently having very large ponderomotive energy of 15 ± 1 eV for electrons in vacuum. The scaling of the emission is studied with respect to the dimensions of the antenna, and it is observed that the capacitance of the LAPCA leads to a severe decrease in and distortion of the biasing voltage pulse, fundamentally limiting the maximum applied bias field and consequently the maximum energy of the radiated THz pulses. In order to demonstrate the advantages of this source in the strong field regime, an open-aperture Z-scan experiment was performed on n-doped InGaAs, which showed significant absorption bleaching.
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Thanawala VJ, Valdez DJ, Joshi R, Forkuo GS, Parra S, Knoll BJ, Bouvier M, Leff P, Bond RA. β-Blockers have differential effects on the murine asthma phenotype. Br J Pharmacol 2015. [PMID: 26211486 DOI: 10.1111/bph.13253] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND AND PURPOSE Our previous studies have shown the β2 -adrenoceptor and its endogenous ligand, adrenaline, are required for development of the asthma phenotype in murine asthma models. Chronic administration of some, but not other, β-blockers attenuated the asthma phenotype and led us to hypothesize that biased signalling was the basis of their differential effects, experimentally and clinically. EXPERIMENTAL APPROACH We used mice with no detectable systemic adrenaline (PNMT(-/-) ) and wild-type (WT) mice to study the effects of four β-blockers, alprenolol, carvedilol, propranolol and nadolol, in an ovalbumin sensitization and challenge (Ova S/C) murine model of asthma. The parameters measured were inflammatory cell infiltration, mucous metaplasia and airway hyperresponsiveness. To interpret the pharmacological action of these ligands quantitatively, we conducted computer simulations of three-state models of receptor activation. KEY RESULTS Ova S/C PNMT(-/-) mice do not develop an asthma phenotype. Here, we showed that administration of alprenolol, carvedilol or propranolol in the absence of interference from adrenaline using Ova S/C PNMT(-/-) mice resulted in the development of an asthma phenotype, whereas nadolol had no effect. Ova S/C WT mice did develop an asthma phenotype, and administration of alprenolol, propranolol and carvedilol had no effect on the asthma phenotype. However, nadolol prevented development of the asthma phenotype in Ova S/C WT mice. Computer simulations of these four ligands were consistent with the isolated three-state receptor model. CONCLUSION AND IMPLICATIONS β-Blockers have different effects on the murine asthma phenotype that correlate with reported differences in activation or inhibition of downstream β2 -adrenoceptor signalling pathways.
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Affiliation(s)
- V J Thanawala
- Department of Integrative and Biology Pharmacology, University of Texas Health Science Center, Houston, TX, USA
| | - D J Valdez
- Department of Pharmacological and Pharmaceutical Sciences, University of Houston, Houston, TX, USA
| | - R Joshi
- Department of Pharmacological and Pharmaceutical Sciences, University of Houston, Houston, TX, USA
| | - G S Forkuo
- Department of Chemistry and Biochemistry, University of Wisconsin, Milwaukee Institute for Drug Discovery, Milwaukee, WI
| | - S Parra
- Vapogenix, Inc., Houston, TX, USA
| | - B J Knoll
- Department of Pharmacological and Pharmaceutical Sciences, University of Houston, Houston, TX, USA
| | - M Bouvier
- Department of Biochemistry, Université de Montréal, Montréal, QC, Canada.,Institute for Research in Immunology and Cancer, Université de Montréal, Montréal, QC, Canada
| | - P Leff
- Consultant in Pharmacology, Cheshire, UK
| | - R A Bond
- Department of Pharmacological and Pharmaceutical Sciences, University of Houston, Houston, TX, USA
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Benezech A, Behr M, Bouvier M, Grimaud JC, Vitton V. Three-dimensional high-resolution anorectal manometry: does it allow automated analysis of sphincter defects? Colorectal Dis 2015; 17:O202-7. [PMID: 26046765 DOI: 10.1111/codi.13017] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 04/27/2015] [Indexed: 02/08/2023]
Abstract
AIM Anorectal manometry is the most common test used to explore anorectal disorders. The recent three-dimensional high-resolution anorectal manometry (3D-HRAM) technique appears to be able to provide new topographic information. Our objective was to develop an automated analysis of 3D-HRAM images to diagnose anal sphincter defects and compare the results with those of endoanal ultrasonography (EUS), which is considered to be the gold standard. METHOD All patients being tested in our department for faecal incontinence or dyschezia by 3D-HRAM and EUS were eligible for the study. 3D-HRAM was used to record resting and squeeze pressure, reflecting internal and external anal sphincter function, respectively. A software platform was designed to automatically analyse the 3D-HRAM images and calculate a diagnostic score for any anal sphincter defect compared with EUS. RESULTS A total of 206 (91% female) patients of mean age of 54 years were included in the study. A sphincter defect was diagnosed by EUS in 130 (63%). The diagnostic scores from the 3D-HRAM automated analysis for an internal anal sphincter defect showed a sensitivity of 65% and a specificity of 65%. For an external anal sphincter defect, the sensitivity was 43% and the specificity 87%. CONCLUSION Our study developed a method based on 3D-HRAM to automatically diagnose sphincter defects, allowing a systematic and comprehensive analysis of the test recordings. Compared with EUS, the 3D-HRAM image analysis procedure revealed poor sensitivity and specificity.
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Affiliation(s)
- A Benezech
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Aix-Marseille Université, Marseille, France
| | - M Behr
- Centre d'Investigation Clinique 1409, Assistance Publique-Hôpitaux de Marseille, Aix-Marseille Université, Marseille, France
| | - M Bouvier
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Aix-Marseille Université, Marseille, France.,Plateforme d'Interface Clinique, CRN2M CNRS UMR 7286, Aix-Marseille Université, Marseille, France
| | - J-C Grimaud
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Aix-Marseille Université, Marseille, France.,Plateforme d'Interface Clinique, CRN2M CNRS UMR 7286, Aix-Marseille Université, Marseille, France
| | - V Vitton
- Service de Gastroentérologie, Hôpital Nord, Assistance Publique-Hôpitaux de Marseille, Aix-Marseille Université, Marseille, France.,Plateforme d'Interface Clinique, CRN2M CNRS UMR 7286, Aix-Marseille Université, Marseille, France
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Bouvier M, Chen H, Li L, Weimershaus M, Evnouchidou I, Van Endert P. ERAP1-ERAP2 dimers trim MHC I-bound precursor peptides: a molecular understanding of peptide editing (APP5P.103). The Journal of Immunology 2015. [DOI: 10.4049/jimmunol.194.supp.183.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Abstract
The human endoplasmic reticulum aminopeptidase 1 (ERAP1) and ERAP2 are critically important in the final processing of MHC class I antigens. To date, the molecular context of peptide trimming by ERAPs, and how ERAPs shape antigen repertoires, remain open questions. Using a cell-free system composed of ERAP1 and ERAP2 heterodimers (ERAP1/2), MHC class I molecules, and N-terminally extended model and natural peptides, we characterized the function of ERAPs. We provide conclusive evidence that ERAP1/2 trims MHC I-bound precursor peptides to the final lengths, albeit more slowly than the corresponding free precursors. We show that trimming of MHC I-bound precursors by ERAP1/2 increases the conformational stability of MHC I/peptide complexes. We will discuss a molecular mechanistic model of peptide editing by ERAP1/2 that unifies and advances our understanding of these important enzymes.
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Affiliation(s)
| | - Hanna Chen
- 1University of Illinois at Chicago, Chicago, IL
| | - Lenong Li
- 1University of Illinois at Chicago, Chicago, IL
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Vitton V, Ben Hadj Amor W, Baumstarck K, Behr M, Bouvier M, Grimaud JC. Comparison of three-dimensional high-resolution manometry and endoanal ultrasound in the diagnosis of anal sphincter defects. Colorectal Dis 2014; 15:e607-11. [PMID: 23773540 DOI: 10.1111/codi.12319] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Accepted: 04/26/2013] [Indexed: 12/29/2022]
Abstract
AIM Three-dimensional high-resolution anorectal manometry (3D HRAM) is a new technique that can simultaneously provide physiological and topographical data. Our aim was to assess whether it can identify anal sphincter defects by comparing it with endoanal ultrasonography (EUS) considered as the gold standard. METHOD An anal defect on 3D HRAM was defined as a continuous circumferential area over which the pressure was < 10 mmHg during the measurement of anal resting and voluntary contraction pressure. Inter-observer agreement was also assessed. RESULTS A total of 100 patients (93 females) with a mean age of 53.5 ± 15.3 years were included. The positive diagnosis of an anal sphincter defect using 3D HRAM and EUS was in agreement (59.3%) (κ = 0.419) of the time for the internal anal sphincter (IAS) and (55.9%) (κ = 0.461) for the external anal sphincter (EAS). The inter-observer agreement for a diagnosis of an anal sphincter defect was (100%) (κ = 0.937) for the IAS and (95%) (κ = 0.751) for the EAS. The intra-class correlation coefficient for the extent of the defect was 0.853 for the IAS and 0.651 for the EAS. CONCLUSION The preliminary results demonstrate some level of agreement in the diagnosis of anal sphincter defects between 3D HRAM and EUS but insufficient for 3D HRAM to be adequately reliable using the criteria chosen. The excellent inter-observer agreement, however, demonstrates that 3D HRAM is reproducible and provides a new dimension for the evaluation of sphincter function.
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Affiliation(s)
- V Vitton
- Service de Gastroentérologie, CHU Nord, Marseille, France; Interface de Recherche translationnelle en Neurogastroentérologie, CRN2M, UMR 7286, Aix-Marseille Université, Marseille, France
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Deschildre A, Villard-Truc F, Gomez SA, Santos C, Just J, Bidat E, de Boissieu D, Bourrier T, Bouvier M, Chabert A, Couderc L, Doyen V, Dassonval C, Hoppé A, Jubin V, Kassmann K, Morisset M, Villain A. Plan d’action en cas de réaction accidentelle dans l’allergie alimentaire chez l’enfant : position du groupe de travail « allergie alimentaire » sous l’égide de la Société française d’allergologie. Revue Française d'Allergologie 2014. [DOI: 10.1016/j.reval.2014.01.035] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Bouvier M, Brunner A, Aime F. Arrosage nocturne des rues et effets induits sur le rafraîchissement ambiant en cas de canicule. ACTA ACUST UNITED AC 2014. [DOI: 10.1051/tsm/201312043] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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Benezech A, Bouvier M, Grimaud JC, Baumstarck K, Vitton V. Three-dimensional high-resolution anorectal manometry and diagnosis of excessive perineal descent: a comparative pilot study with defaecography. Colorectal Dis 2014; 16:O170-5. [PMID: 24373215 DOI: 10.1111/codi.12522] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2013] [Accepted: 10/18/2013] [Indexed: 01/22/2023]
Abstract
AIM Three-dimensional high-resolution anorectal manometry (3DHRAM) is a new technique that can simultaneously provide physiological and topographical data on the terminal part of the digestive tract. Our object was to assess whether 3DHRAM is able to reliably diagnose excessive perineal descent already diagnosed with conventional defaecography, which is considered to be the gold standard. METHOD All patients referred to our centre for anorectal manometry and conventional defaecography were evaluated with a maximum of 6 months between the two examinations. Anorectal manometry was performed using the 3D High-Resolution Given Imaging® probe. Excessive perineal descent was defined as the downward movement of the anal high-pressure zone during straining. At the end of the straining effort, the high-pressure zone regained its initial position, thereby indicating that the probe had not moved. RESULTS Nineteen female patients of median age 53 (21-70) years were included in the study. All cases with excessive perineal descent diagnosed using defaecography were visualized with 3DHRAM. The degree of perineal descent determined by 3D and conventional defaecography was compared (Spearman correlation 0.726, P = 0.01). In contrast, the averages measured were significantly different; the average was 11.68 ± 3.3 mm for 3DHRAM but 34.21 ± 13.3 mm for conventional defaecography (P = 0.002). CONCLUSION The results of the study demonstrate that 3DHRAM can diagnose excessive perineal descent with the same degree of reliability as defaecography. Quantitative measures were not correlated, however, possibly because of methodological differences. The study confirms the value of the morphological data provided by 3DHRAM.
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Affiliation(s)
- A Benezech
- Service de Gastroentérologie, Hôpital Nord, University Hospital, APHM, Marseille, France
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Vitton V, Soudan D, Siproudhis L, Abramowitz L, Bouvier M, Faucheron JL, Leroi AM, Meurette G, Pigot F, Damon H. Treatments of faecal incontinence: recommendations from the French national society of coloproctology. Colorectal Dis 2014; 16:159-66. [PMID: 24521273 DOI: 10.1111/codi.12410] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Accepted: 06/09/2013] [Indexed: 12/13/2022]
Abstract
Faecal incontinence is common and significantly affects quality of life. Its treatment involves dietary manipulation, medical treatments, perineal rehabilitation or surgery. In this paper, the French National Society of Coloproctology offers recommendations based on the data in the current literature, including those on recently developed treatments. There is a lack of high quality data and most of the recommendations are therefore based either on grade of recommendation B or expert recommendation (Level 4). However, the literature supports the construction of an algorithm based on the available scientific evidence and expert recommendation which may be useful in clinical practice. The French National Society of Coloproctology proposes a decision-making algorithm that includes recent developments of treatment. The current recommendations support sacral nerve modulation as the key treatment for faecal incontinence. They do not support the use of sphincter substitutions except in certain circumstances. Transanal irrigation is a novel often successful treatment of faecal incontinence due to neurological disorders.
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Affiliation(s)
- V Vitton
- Service de Gastroentérologie, Hôpital Nord, AP-HM, Interface de recherche translationnelle en neurogastroentérologie, CRN2M, UMR 7286, Aix-Marseille Université, Marseille, France
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Vitton V, Ben Hadj Amor W, Baumstarck K, Grimaud JC, Bouvier M. Water-perfused manometry vs three-dimensional high-resolution manometry: a comparative study on a large patient population with anorectal disorders. Colorectal Dis 2013; 15:e726-31. [PMID: 24034300 DOI: 10.1111/codi.12397] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Accepted: 06/13/2013] [Indexed: 12/24/2022]
Abstract
AIM Our aim was to compare for the first time measurements obtained with water-perfused catheter anorectal manometry and three-dimensional (3D) high-resolution manometry in patients with anorectal disorders. METHOD Consecutive patients referred to our centre for anorectal manometry (ARM) were recruited to undergo the two procedures successively. Conventional manometry was carried out using a water-perfused catheter (WPAM) and high-resolution manometry was achieved with a 3D probe (3DHRAM). For each procedure, parameters recorded included the following: anal canal length, resting pressure, squeeze pressure and rectal sensitivity. RESULTS Two hundred and one patients were included in this study. The mean values for resting and squeeze pressures were correlated and found to be significantly higher when measured with 3DHRAM than with WPAM. However, the length of the anal canal was not significantly different when measured by the two techniques without correlation between the two mean values obtained. The presence of the rectoanal inhibitory reflex was systematically assessed by both WPAM and 3DHRAM and anismus was also systematically diagnosed by both WPAM and 3DHRAM. CONCLUSION The pressure values obtained with 3DHRAM are correlated with those measured with conventional manometry but are systematically higher. 3DHRAM has the advantage of providing a pressure recording over the entire length and circumference of the anal canal, allowing a more useful physiological assessment of anorectal function.
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Affiliation(s)
- V Vitton
- Service de Gastroentérologie, CHU Nord, Marseille, France; Interface de Recherche Translationnelle en Neurogastroentérologie, Aix-Marseille Université, Marseille, France
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Bouvier M, Claustrat B, Franco P, Inocente C. Effet de la mélatonine exogène sur le sommeil de l’enfant souffrant de troubles envahissants du développement (TED) : résultats préliminaires. Neurophysiol Clin 2013. [DOI: 10.1016/j.neucli.2013.01.057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Bouvier M, Nantel F, Valiquette M, Moffett S, Mouillac B. Le récepteur β2-adrénergique. Un modèle d'étude des mécanismes moléculaires de la désensibilisation. ACTA ACUST UNITED AC 2013. [DOI: 10.4267/10608/2293] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Queralto M, Vitton V, Bouvier M, Abysique A, Portier G. Interferential therapy: a new treatment for slow transit constipation. a pilot study in adults. Colorectal Dis 2013; 15:e35-9. [PMID: 23046450 DOI: 10.1111/codi.12052] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2012] [Accepted: 08/11/2012] [Indexed: 01/11/2023]
Abstract
AIM The study aimed to assess, for the first time, the effectiveness of interferential therapy (IFT) in the treatment of slow transit constipation in adults and its impact on the quality of life. METHOD All consecutive patients with slow transit constipation diagnosed by symptomology and a colonic transit time (CTT) of > 100 h measured with radiopaque markers were included in this prospective study. IFT was performed for 1 h/day over 3 months. Clinical improvement was based on the stool diary and the Knowles-Eccersley-Scott Symptom and Cleveland Clinic Constipation Scores. Quality of life was assessed with the Gastrointestinal Quality of Life Index questionnaire. RESULTS Eleven patients with a median age of 51 years were included. At the end of the follow-up period, seven (63.6%) had significantly improved after IFT with a median of 0.66 stools per week [interquartile range (IQR) 0.33-0.66] before treatment and 1.66 (IQR 1.33-1.66) after (P = 0.007). The Knowles-Eccersley-Scott Symptom score changed from 30 (IQR 27-33) before treatment to 19 (IQR 17-26) after treatment (P = 0.005) and the Cleveland Clinic Constipation Score from 26 (IQR 25-28) to 17 (IQR 13-24; P = 0.005). The CTT improved from 103 h (IQR 101-113) to 98 h (IQR 94-107; P = 0.02). The Gastrointestinal Quality of Life Index score improved from 60 (IQR 57-63) to 95 (IQR 68-100; P = 0.005). CONCLUSION IFT is a new non-invasive treatment for slow transit constipation. Further studies to confirm these results with longer follow-up are necessary.
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Affiliation(s)
- M Queralto
- Service de Colo-proctologie, Clinique des Cèdres, Cornebarrieu, France
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Leroi AM, Siproudhis L, Etienney I, Damon H, Zerbib F, Amarenco G, Vitton V, Faucheron JL, Thomas C, Mion F, Roumeguère P, Gourcerol G, Bouvier M, Lallouche K, Menard JF, Queralto M. Transcutaneous electrical tibial nerve stimulation in the treatment of fecal incontinence: a randomized trial (CONSORT 1a). Am J Gastroenterol 2012; 107:1888-96. [PMID: 23032981 DOI: 10.1038/ajg.2012.330] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
OBJECTIVES The objective of this study was to show that although transcutaneous electrical tibial nerve stimulation (TENS) is being increasingly used to treat fecal incontinence (FI), its efficacy has never been proved using controlled trials. METHODS In this randomized, double-blind, sham-controlled trial, 144 patients aged 30-82 years from nine centers were randomly assigned to receive either active or sham stimulations for 3 months. The primary end point was the response to treatment based on the number of incontinence and urgency episodes. Secondary end points were severity scores, quality of life scores, delay to postpone defecation, patient self-assessment of treatment efficacy, physician assessment of TENS efficacy, anorectal manometry, and adverse events. RESULTS No statistically significant difference was seen between active and sham TENS in terms of an improvement in the median number of FI/urgency episodes per week. Thirty-four patients (47%) who received the active TENS treatment exhibited a >30% decrease in the FI severity score compared with 19 patients (27%) who received the sham treatment (odds ratio 2.4, 95% confidence interval 1.1-5.1, P=0.02). No differences in delay to postpone defecation, patient self-assessment of treatment efficacy, or anorectal manometry were seen between the two groups. The evaluating physicians rated the active stimulations as more effective than the sham stimulations (P=0.01). One minor therapy-related adverse event was observed (1.5%) (see Supplementary Consort 1b). CONCLUSIONS We failed to demonstrate any benefit of TENS on our primary end-point.
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Affiliation(s)
- A M Leroi
- INSERM U1073, Service de Physiologie Digestive, Hôpital Charles Nicolle, CHU Rouen, INSERM CIC 0204, Rouen, France.
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Li L, Muzahim Y, Bouvier M. Crystal structure of adenovirus E3-19K bound to HLA-A2 reveals mechanism for immunomodulation. Nat Struct Mol Biol 2012; 19:1176-81. [PMID: 23042604 PMCID: PMC3492506 DOI: 10.1038/nsmb.2396] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2012] [Accepted: 08/30/2012] [Indexed: 01/07/2023]
Abstract
E3-19K binds to and retains MHC class I molecules in the endoplasmic reticulum, suppressing anti-adenovirus activities of T cells. We determined the structure of the adenovirus serotype 2 (Ad2, species C) E3-19K-HLA-A2 complex to 1.95-Å resolution. Ad2 E3-19K binds to the N terminus of the HLA-A2 groove, contacting the α1, α2 and α3 domains and β(2)m. Ad2 E3-19K has a unique structure comprising a large N-terminal domain, formed by two partially overlapping β-sheets arranged in a V shape, and a C-terminal α-helix and tail. The structure reveals determinants in E3-19K and HLA-A2 that are important for complex formation; conservation of some of these determinants in E3-19K proteins of different species and MHC I molecules of different loci suggests a universal binding mode for all E3-19K proteins. Our structure is important for understanding the immunomodulatory function of E3-19K.
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Affiliation(s)
| | | | - Marlene Bouvier
- Corresponding author at: Department of Microbiology and Immunology, University of Illinois at Chicago, Chicago, IL, USA; Phone number: +1 312 355 0664; Fax number: +1 312 996 6415; (M. Bouvier)
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Li L, Muzahim Y, Bouvier M. Suppression of antigen presentation by the adenovirus E3-19K protein; a crystallographic analysis of E3-19K/MHC I interaction (106.37). The Journal of Immunology 2012. [DOI: 10.4049/jimmunol.188.supp.106.37] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
The cell-surface presentation of viral antigens by MHC class I molecules is critical for eliminating infected cells. In turn, viruses have evolved strategies to interfere with the process of antigen presentation. The adenovirus (Ad) E3-19K protein binds to and retains MHC class I molecules in the endoplasmic reticulum (ER), blocking their egress to the cell surface. We characterized for the first time interaction between Ad type 2 (Ad2) E3-19K and HLA-A2 using x-ray crystallography. Our structure to 2.1Å resolution reveals that Ad2 E3-19K interacts with the N-terminus of the α1-helix and C-terminus of the α2-helix of HLA-A2, i.e., the C-terminal end of the groove. E3-19K binds away from the opening of the groove. This mode of binding is entirely consistent with our biochemical studies of E3-19K/MHC I interaction, including the ability of E3-19K to associate with mature and immature MHC class I molecules. Importantly, the Ad2 E3-19K/HLA-A2 structure reveals how E3-19K uses it variable and conserved regions to bind to MHC I, and how it accommodates polymorphism in MHC I. Our structure also allows to understand the ability of E3-19K of different Ad serotypes and subgroups to associate with MHC I in an allele- and locus-specific manner. Overall, the Ad2 E3-19K/HLA-A2 structure reveals determinants in E3-19K that are critical for targeting MHC class I molecules. It also permits to better understand how E3-19K has evolved to subvert antigen presentation.
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Affiliation(s)
- Lenong Li
- 1Microbiology & Immunology, University of Illinois at Chicago, Chicago, IL
| | - Yasameen Muzahim
- 1Microbiology & Immunology, University of Illinois at Chicago, Chicago, IL
| | - Marlene Bouvier
- 1Microbiology & Immunology, University of Illinois at Chicago, Chicago, IL
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Bouvier M, Li L, Muzahim Y. Suppression of antigen presentation by the adenovirus E3-19 K protein; a crystallographic analysis of E3-19 K/MHC I interaction. Mol Immunol 2012. [DOI: 10.1016/j.molimm.2012.02.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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39
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Zimmerman B, Beautrait A, Aguila B, Charles R, Escher E, Claing A, Bouvier M, Laporte SA. Differential -Arrestin-Dependent Conformational Signaling and Cellular Responses Revealed by Angiotensin Analogs. Sci Signal 2012; 5:ra33. [DOI: 10.1126/scisignal.2002522] [Citation(s) in RCA: 126] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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40
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Garnier L, Selman L, Rouzaire P, Bouvier M, Roberts O, Bérard F, Bienvenu J, Bienvenu F. Molecular allergens in the diagnosis of latex allergy. Eur Ann Allergy Clin Immunol 2012; 44:73-79. [PMID: 22768726] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
BACKGROUND Molecular allergens enable the definition of sensitization profiles in allergic patients. AIM To validate the most helpful allergens for the diagnosis of latex allergy in different clinical situations. METHODS 130 patients suspected to be allergic to latex with positive IgE against natural rubber latex (NRL) have been studied: 97 were confirmed as latex allergic (among which 55 professionally exposed to latex and 35 with a peranaesthetic anaphylactic shock) and 33 were only sensitized to latex without clinical allergy. Each serum was tested for IgE against 9 recombinant latex allergens and bromelain using Phadia ImmunoCAP 250. RESULTS rHev b 6.01, 6.02, 2 and 5 were the major allergens in the allergic population. An excellent correlation (94%) was observed between IgE against rHev b 6.01 and latex prick test positivities. IgE against rHev b 1, 3 and 5 were more frequent and their levels significantly higher in patients with peranaesthetic anaphylactic shock. Among the asymptomatic patients (29/33 allergic to pollen), NRL IgE positivity is explained by the presence of anti-rHev b 8 and/or anti-carbohydrate IgE. CONCLUSIONS rHev b 6.01 and rHev b 5 specific IgE are of major interest to confirm latex allergy diagnosis. rHev b 5 is particularly useful in case of monosensitization where clinical symptoms and latex skin prick tests may be discordant, rHev b1 and rHev b 3 are interesting to document multi-operated and peranaesthetic latex allergy. Finally, rHev b 8 is a helpful marker to highlight latex/pollen cross-reactivity which improves the specificity of the serological tests.
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Affiliation(s)
- L Garnier
- Allergy Unit, Laboratory of Immunology, Hospices Civils de Lyon, Centre Hospitalier Lyon Sud, Pierre Bénite F-69495, France
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Abstract
AIM Sacral nerve stimulation (SNS) reduces incontinence episodes and improves the quality of life of patients treated for faecal incontinence. However, the exact mechanism of action of this technique remains unclear. The present article reviews the pertinent neuroanatomy and neurophysiology related to SNS and provides explanations for potential mechanisms of action. METHOD A systematic review of the literature was performed for studies of the potential mechanisms of action of SNS, using MEDLINE, PubMed, Embase and the Cochrane Library. Articles dealing with the technique, adverse events and economic evaluations of SNS, as well as literature reviews, were excluded, except for reviews dealing with the mechanisms of action of SNS. The following inclusion criteria were used to select articles: (i) articles in English, (ii) randomized, double-blinded, sham-controlled studies, and (iii) cohort studies. Case-control studies or retrospective studies were cited only when randomized or cohort studies could not be found. RESULTS We propose three hypotheses to explain the mechanism of action of SNS: (i) a somato-visceral reflex, (ii) a modulation of the perception of afferent information, and (iii) an increase in external anal sphincter activity. CONCLUSION The mechanism of action of SNS in patients with faecal incontinence almost certainly depends on the modulation of spinal and/or supraspinal afferent inputs. Further research on humans and animals will be required to gain a better understanding of the mechanisms of action of SNS.
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Affiliation(s)
- G Gourcerol
- ADEN EA 3234/IFR MP 23, Physiology Unit, Rouen University Hospital, Rouen, France
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42
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Fu J, Li L, Bouvier M. Modulation of MHC class I antigen presentation by the adenovirus E3-19K protein (100.8). The Journal of Immunology 2011. [DOI: 10.4049/jimmunol.186.supp.100.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
The presentation of viral antigens by MHC I to CTLs is vital for elimination of infected cells. In turn, viruses have evolved various strategies to abrogate antiviral cellular immune responses. For example, the adenovirus (Ad) E3-19K protein retains MHC I in the endoplasmic reticulum, dramatically suppressing the cell-surface presentation of viral antigens. Many aspects of how E3-19K exerts its function towards MHC I are poorly understood. This knowledge is important as the E3-19K/MHC I interaction is thought to play a role in enabling Ads to cause persistent infections. We characterized biophysically and cellularly interaction between E3-19K proteins of different Ad serotypes (Ad 7 and 35, subgroup B; Ad 2 and Ad 5, subgroup C; Ad 37, subgroup D; and Ad 4, subgroup E) and HLA-A, -B, and -C molecules. Our results show that E3-19K proteins from Ad serotypes of the same subgroup display more similar binding properties for a given MHC I than those of different subgroups. Furthermore, E3-19K proteins exhibited allele- and locus-specificity; higher avidity for HLA-A relative to -B molecules, and no interaction with HLA-C molecules. FACS analysis showed that binding affinities correlated (in a negative way) with levels of MHC I expression on infected cells. Finally, we propose the first model of interaction between E3-19K and MHC I. Overall, our studies provide novel insights into the structure/function relationship of E3-19K and the molecular cell biology of antigen presentation.
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Affiliation(s)
- Jie Fu
- 1Department of Microbiology and Immunology, University of Illinois at Chicago, Chicago, IL
| | - Lenong Li
- 1Department of Microbiology and Immunology, University of Illinois at Chicago, Chicago, IL
| | - Marlene Bouvier
- 1Department of Microbiology and Immunology, University of Illinois at Chicago, Chicago, IL
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Savoye F, Rozand C, Bouvier M, Gleizal A, Thevenot D. Optimized enrichment for the detection of Escherichia coli O26 in French raw milk cheeses. Lett Appl Microbiol 2011; 52:603-9. [DOI: 10.1111/j.1472-765x.2011.03044.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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44
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Fu J, Li L, Bouvier M. Adenovirus E3-19K proteins of different serotypes and subgroups have similar, yet distinct, immunomodulatory functions toward major histocompatibility class I molecules. J Biol Chem 2011; 286:17631-9. [PMID: 21454588 DOI: 10.1074/jbc.m110.212050] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Our understanding of the mechanism by which the E3-19K protein from adenovirus (Ad) targets major histocompatibility complex (MHC) class I molecules for retention in the endoplasmic reticulum is derived largely from studies of Ad serotype 2 (subgroup C). It is not well understood to what extent observations on the Ad2 E3-19K/MHC I association can be generalized to E3-19K proteins of other serotypes and subgroups. The low levels of amino acid sequence homology between E3-19K proteins suggest that these proteins are likely to manifest distinct MHC I binding properties. This information is important as the E3-19K/MHC I interaction is thought to play a critical role in enabling Ads to cause persistent infections. Here, we characterized interaction between E3-19K proteins of serotypes 7 and 35 (subgroup B), 5 (subgroup C), 37 (subgroup D), and 4 (subgroup E) and a panel of HLA-A, -B, and -C molecules using native gel, surface plasmon resonance (SPR), and flow cytometry. Results show that all E3-19K proteins exhibited allele specificity toward HLA-A and -B molecules; this was less evident for Ad37 E3-19K. The allele specificity for HLA-A molecules was remarkably similar for different serotypes of subgroup B as well as subgroup C. Interestingly, all E3-19K proteins characterized also exhibited MHC I locus specificity. Importantly, we show that Lys(91) in the conserved region of Ad2 E3-19K targets the C terminus of the α2-helix (MHC residue 177) on MHC class I molecules. From our data, we propose a model of interaction between E3-19K and MHC class I molecules.
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Affiliation(s)
- Jie Fu
- Department of Microbiology and Immunology, University of Illinois, College of Medicine, Chicago, Illinois 60612, USA
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45
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Fu J, Bouvier M. Determinants of the endoplasmic reticulum (ER) lumenal-domain of the adenovirus serotype 2 E3-19K protein for association with and ER-retention of major histocompatibility complex class I molecules. Mol Immunol 2011; 48:532-8. [PMID: 21094528 PMCID: PMC3032990 DOI: 10.1016/j.molimm.2010.10.017] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [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: 08/20/2010] [Revised: 10/18/2010] [Accepted: 10/22/2010] [Indexed: 10/18/2022]
Abstract
The E3-19K immunomodulatory protein from adenoviruses (Ads) inhibits antigen presentation by major histocompatibility complex (MHC) class I molecules. As a result, the ability of Ad-specific cytotoxic T lymphocytes (CTLs) to lyse infected cells is suppressed. The ER-lumenal domain of E3-19K is subdivided into a variable (residues 1 to ∼78/81) and conserved (residues ∼79/82 to 98) region followed by a linker (residues 99-107). Using molecular and cellular approaches, we characterized in detail the properties of the ER-lumenal domain of E3-19K that enable it to target MHC class I molecules. Proteolysis of recombinant serotype 2 E3-19K (residues 1-100) (with six His residues) generated a large N-terminal (residues 1-88) and a small C-terminal fragment (residues 94-100) in solution. Neither of these fragments associates with HLA-A*1101 as shown by a native gel band-shift assay. In contrast, the N-terminal 1-93 residues of Ad2 E3-19K exhibited the same binding affinity to HLA-A*1101 as E3-19K. Using a site-directed mutational analysis and flow cytometry, we show that Tyr(93), but not Tyr(88), critically modulates the cell-surface expression of MHC class I molecules. Taken together, these results indicate that the sequence comprising residues 89-93 (M(89)SKQY(93)), and in particular Tyr(93), in the conserved region of E3-19K is critical for its immunomodulatory function. Residues 89-93 likely form a linker or loop in E3-19K. Overall, our data provide novel insights into the structure of E3-19K and identify key determinants for association with and ER-retention of its cellular target protein. This knowledge is important for our understanding of the molecular basis of Ad pathogenesis.
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Affiliation(s)
- Jie Fu
- Department of Microbiology and Immunology, University of Illinois at Chicago, College of Medicine, 835 S. Wolcott, Chicago, IL 60612
| | - Marlene Bouvier
- Department of Microbiology and Immunology, University of Illinois at Chicago, College of Medicine, 835 S. Wolcott, Chicago, IL 60612
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46
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Savoye F, Feng P, Rozand C, Bouvier M, Gleizal A, Thevenot D. Comparative evaluation of a phage protein ligand assay with real-time PCR and a reference method for the detection of Escherichia coli O157:H7 in raw ground beef and trimmings. J Food Prot 2011; 74:6-12. [PMID: 21219756 DOI: 10.4315/0362-028x.jfp-10-271] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Enterohemorrhagic Escherichia coli O157:H7 is an important pathogen associated with infections caused by consumption of undercooked raw meat. Sensitive and rapid detection methods for E. coli O157:H7 are essential for the meat industry to ensure a safe meat supply. This study was conducted to compare the sensitivity of the VIDAS ultra performance E. coli test (ECPT UP) with a noncommercial real-time (RT) PCR method and the U.S. Department of Agriculture, Food Safety and Inspection Service (USDA-FSIS) reference method for detecting E. coli O157:H7 in raw ground beef. Optimal enrichment times and the efficacy of testing different types of raw meat, either as individual samples (25 g) or as composites (375 g), were examined. For 25-g samples of each type of raw ground beef tested, 6 h of enrichment was sufficient for both the VIDAS ECPT UP and RT-PCR methods, but for 375-g samples, 24 h of enrichment was required. Both the VIDAS ECPT UP and RT-PCR methods produced results similar to those obtained with the USDA-FSIS reference method after 18 to 24 h of enrichment. The primer specificity of the RT-PCR assay and the highly specific phage ligand used in the VIDAS ECPT UP for target recognition enabled the detection of low levels of E. coli O157:H7 in 25 g of various types of raw ground beef. The tests also allowed the detection of E. coli O157:H7 in composite raw ground beef and trimmings in samples of up to 375 g.
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Affiliation(s)
- F Savoye
- Unité de Microbiologie Alimentaire et Prévisionnelle, Vetagro Sup Lyon, 1 av Bourgelat, 69280 Marcy L'Etoile, France.
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47
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Bouvier M, Fu J, Li L. A molecular characterization of how the immunomodulatory E3-19K protein from adenovirus binds to and retains MHC class I molecules in the endoplasmic reticulum (39.23). The Journal of Immunology 2010. [DOI: 10.4049/jimmunol.184.supp.39.23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Adenoviruses (Ads) cause persistent infections. The E3-19K protein from Ads retains MHC class I molecules in the endoplasmic reticulum (ER), suppressing antigen presentation to T cells. The ER-lumenal domain of E3-19K is subdivided into a variable (residues 1-81), conserved (residues 82-100), and linker (residues 101-107) regions. We show that proteolysis of serotype 2 E3-19K (residues 1-100) generates a large N-terminal 1-88 fragment and a small C-terminal 94-100 fragment that span the variable and conserved regions, respectively. Neither of these fragments associates with HLA-A*1101. However, the N-terminal 1-93 residues bind with high-affinity to HLA-A*1101; Tyr93 is critical for this interaction. The data suggest that a delicate structural interplay between the variable and conserved regions enables E3-19K to exert its MHC binding function. Interestingly, Ad37 E3-19K displays weaker binding affinities for class I molecules relative to Ad2 E3-19K but retains the same locus specificity; both proteins associate with HLA-A and -B molecules but not HLA-C molecules. We provide evidence that the class I locus specificity of E3-19K is defined by MHC residue 177. Finally, we present a model which MHC residues 56 and 177 represent “hotspots” for the variable and conserved regions, respectively, of E3-19K. In conclusion, the knowledge derived from our studies helps not only to better understand host/Ad interaction, but also to design novel antiviral therapies against Ad infections.
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Affiliation(s)
- Marlene Bouvier
- 1Microbiology and Immunology, University of Illinois at Chicago, Chicago, IL
| | - Jie Fu
- 1Microbiology and Immunology, University of Illinois at Chicago, Chicago, IL
| | - Lenong Li
- 1Microbiology and Immunology, University of Illinois at Chicago, Chicago, IL
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48
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Rihakova L, Quiniou C, Hamdan FF, Kaul R, Brault S, Hou X, Lahaie I, Sapieha P, Hamel D, Shao Z, Gobeil F, Hardy P, Joyal JS, Nedev H, Duhamel F, Beauregard K, Heveker N, Saragovi HU, Guillon G, Bouvier M, Lubell WD, Chemtob S. VRQ397 (CRAVKY): a novel noncompetitive V2 receptor antagonist. Am J Physiol Regul Integr Comp Physiol 2009; 297:R1009-18. [PMID: 19641130 DOI: 10.1152/ajpregu.90766.2008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Vasopressin type 2 receptor (V2R) exhibits mostly important properties for hydroosmotic equilibrium and, to a lesser extent, on vasomotricity. Drugs currently acting on this receptor are analogs of the natural neuropeptide, arginine vasopressin (AVP), and hence are competitive ligands. Peptides that reproduce specific sequences of a given receptor have lately been reported to interfere with its action, and if such molecules arise from regions remote from the binding site they would be anticipated to exhibit noncompetitive antagonism, but this has yet to be shown for V2R. Six peptides reproducing juxtamembranous regions of V2R were designed and screened; the most effective peptide, cravky (labeled VRQ397), was characterized. VRQ397 was potent (IC(50) = 0.69 +/- 0.25 nM) and fully effective in inhibiting V2R-dependent physiological function, specifically desmopressin-L-desamino-8-arginine-vasopressin (DDAVP)-induced cremasteric vasorelaxation; this physiological functional assay was utilized to avoid overlooking interference of specific signaling events. A dose-response profile revealed a noncompetitive property of VRQ397; correspondingly, VRQ397 bound specifically to V2R-expressing cells could not displace its natural ligand, AVP, but modulated AVP binding kinetics (dissociation rate). Specificity of VRQ397 was further confirmed by its inability to bind to homologous V1 and oxytocin receptors and its inefficacy to alter responses to stimulation of these receptors. VRQ397 exhibited pharmacological permissiveness on V2R-induced signals, as it inhibited DDAVP-induced PGI(2) generation but not that of cAMP or recruitment of beta-arrestin2. Consistent with in vitro and ex vivo effects as a V2R antagonist, VRQ397 displayed anticipated in vivo aquaretic efficacy. We hereby describe the discovery of a first potent noncompetitive antagonist of V2R, which exhibits functional selectivity, in line with properties of a negative allosteric modulator.
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Affiliation(s)
- L Rihakova
- Departments of Pediatrics and Pharmacology, Hôpital Ste Justine, Research Center, Montreal, QC, Canada
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49
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Bouvier M, Fu J. A molecular understanding of how the immunomodulatory E3-19K protein from adenovirus interferes with the class I antigen presentation pathway (78.13). The Journal of Immunology 2009. [DOI: 10.4049/jimmunol.182.supp.78.13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
Adenoviruses (Ads) cause persistent infections. The Ad E3-19K protein binds and retains class I MHC molecules in the endoplasmic reticulum (ER), suppressing the cell-surface presentation of viral peptides. The molecular mechanism of E3-19K-mediated class I retention is mostly uncharacterized. This knowledge is important to better understand Ad pathogenicity, and to gain insights into the susceptibility of the class I antigen presentation pathway to viral interferences.
Using biophysical and cell-based approaches, we showed for the first time that E3-19K associates with immature (nascent) and mature (peptide-filled) class I molecules. We also showed that E3-19K does not compete with the class I assembly proteins for binding onto class I molecules. Importantly, immature class I sequestered by E3-19K can still bind peptides. Together, these results suggest that Ads have evolved to interfere with the early and late stages of the class I antigen presentation pathway. We also showed that E3-19K associates with HLA-A and -B molecules, but not HLA-C molecules. This locus specificity may provide a functional advantage to Ads by inactivating T-cell receptors, while avoiding activation of NK receptors. Finally, we showed that residue 56 in MHC and residue 93 in E3-19K are highly critical for class I association with E3-19K. Overall, our results provide a molecular understanding of Ad pathogenicity. Funded by NIH AI65943.
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Affiliation(s)
- Marlene Bouvier
- 1Microbiology and Immunology, University of Illinois at Chicago, Chicago, Il
| | - Jie Fu
- 1Microbiology and Immunology, University of Illinois at Chicago, Chicago, Il
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50
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Fu J, Bouvier M. Molecular insights into how the adenovirus E3-19K protein associates with MHC class I molecules (131.5). The Journal of Immunology 2009. [DOI: 10.4049/jimmunol.182.supp.131.5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Abstract
The immunomodulatory protein E3-19K from Adenoviruses (Ads) blocks cell surface expression of MHC class I by preventing their export from endoplasmic reticulum (ER), thus evading host's antiviral cellular immune responses. Currently, structural information on E3-19K and the biochemical properties of the E3-19K/class I complex is lacking. This knowledge will help not only to better understand host/virus interaction, but also to design effective antiviral therapies against Ad infections. Using a proteolytic approach, we showed that the recombinant, soluble E3-19K (residues 1-100) generated a large N- (residues 1-88) and small C- (residues 94-100) terminal fragments which encompass the majority of residues within the variable and conserved regions, respectively, of E3-19K. We showed that fragments corresponding to the variable and conserved regions do not remain associated together after proteolysis. Moreover, neither of these fragments associates with class I. These results strongly suggest that the ability of E3-19K to bind to class I molecules depends on a delicate structural interplay between the variable and conserved regions. We also identified residue 93 in E3-19K as critical for E3-19K association with class I molecules. Together, these results provide novel insights into the structure/function relationship of E3-19K and its effect on down regulation of class I molecules. Funded by NIH AI65943.
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Affiliation(s)
- Jie Fu
- 1Department of Microbiology and Immunology, College of Medicine, University of Illinois at Chicago, Chicago, Illinois
| | - Marlene Bouvier
- 1Department of Microbiology and Immunology, College of Medicine, University of Illinois at Chicago, Chicago, Illinois
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