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Perdomo D, Berdance E, Lallinger-Kube G, Sahin A, Dacheux D, Landrein N, Cayrel A, Ersfeld K, Bonhivers M, Kohl L, Robinson DR. TbKINX1B: a novel BILBO1 partner and an essential protein in bloodstream form Trypanosoma brucei. Parasite 2022; 29:14. [PMID: 35262485 PMCID: PMC8906236 DOI: 10.1051/parasite/2022015] [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: 02/16/2021] [Accepted: 02/20/2022] [Indexed: 12/17/2022] Open
Abstract
The flagellar pocket (FP) of the pathogen Trypanosoma brucei is an important single copy structure that is formed by the invagination of the pellicular membrane. It is the unique site of endo- and exocytosis and is required for parasite pathogenicity. The FP consists of distinct structural sub-domains with the least explored being the flagellar pocket collar (FPC). TbBILBO1 is the first-described FPC protein of Trypanosoma brucei. It is essential for parasite survival, FP and FPC biogenesis. In this work, we characterize TbKINX1B, a novel TbBILBO1 partner. We demonstrate that TbKINX1B is located on the basal bodies, the microtubule quartet (a set of four microtubules) and the FPC in T. brucei. Down-regulation of TbKINX1B by RNA interference in bloodstream forms is lethal, inducing an overall disturbance in the endomembrane network. In procyclic forms, the RNAi knockdown of TbKINX1B leads to a minor phenotype with a small number of cells displaying epimastigote-like morphologies, with a misplaced kinetoplast. Our results characterize TbKINX1B as the first putative kinesin to be localized both at the basal bodies and the FPC with a potential role in transporting cargo along with the microtubule quartet.
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Affiliation(s)
- Doranda Perdomo
- University of Bordeaux, CNRS, Microbiologie Fondamentale et Pathogénicité, UMR 5234, 33000 Bordeaux, France
| | - Elodie Berdance
- University of Bordeaux, CNRS, Microbiologie Fondamentale et Pathogénicité, UMR 5234, 33000 Bordeaux, France
| | - Gertrud Lallinger-Kube
- Department of Genetics, Bldg. NW1, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
| | - Annelise Sahin
- University of Bordeaux, CNRS, Microbiologie Fondamentale et Pathogénicité, UMR 5234, 33000 Bordeaux, France
| | - Denis Dacheux
- University of Bordeaux, CNRS, Microbiologie Fondamentale et Pathogénicité, UMR 5234, 33000 Bordeaux, France - Institut Polytechnique de Bordeaux, Microbiologie Fondamentale et Pathogénicité, UMR 5234, 33000, Bordeaux, France
| | - Nicolas Landrein
- University of Bordeaux, CNRS, Microbiologie Fondamentale et Pathogénicité, UMR 5234, 33000 Bordeaux, France
| | - Anne Cayrel
- University of Bordeaux, CNRS, Microbiologie Fondamentale et Pathogénicité, UMR 5234, 33000 Bordeaux, France
| | - Klaus Ersfeld
- Department of Genetics, Bldg. NW1, University of Bayreuth, Universitätsstraße 30, 95440 Bayreuth, Germany
| | - Mélanie Bonhivers
- University of Bordeaux, CNRS, Microbiologie Fondamentale et Pathogénicité, UMR 5234, 33000 Bordeaux, France
| | - Linda Kohl
- UMR 7245 Molécules de Communication et Adaptation des Micro-organismes, Muséum National d'Histoire Naturelle, CNRS, CP52, 61 rue Buffon, 75231 Paris Cedex 05, France
| | - Derrick R Robinson
- University of Bordeaux, CNRS, Microbiologie Fondamentale et Pathogénicité, UMR 5234, 33000 Bordeaux, France
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Quesada Ocete B, Quesada Dorador A, Diez Albero L, Bochard-Villanueva B, Rubini-Costa R, Paya-Serrano R, Rubini-Puig R, Lopez-Valero L, Fernandez-Diaz C, Palanca-Gil V, Ruiz-Moliner C, Jimenez-Bello J, De La Espriella R, Perdomo D, Trejo-Velasco B. P1217Impact of diabetes mellitus in the clinical presentation and outcomes of atrial fibrillation. Europace 2018. [DOI: 10.1093/europace/euy015.699] [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: 11/14/2022] Open
Affiliation(s)
| | - A Quesada Dorador
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - L Diez Albero
- Faculty of Medicine, Catholic University of Valencia “San Vicente Martir”, Valencia, Spain
| | - B Bochard-Villanueva
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - R Rubini-Costa
- Faculty of Medicine, Catholic University of Valencia “San Vicente Martir”, Valencia, Spain
| | - R Paya-Serrano
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - R Rubini-Puig
- University General Hospital of Valencia, Emergency Department, Valencia, Spain
| | - L Lopez-Valero
- Faculty of Medicine, Catholic University of Valencia “San Vicente Martir”, Valencia, Spain
| | - C Fernandez-Diaz
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - V Palanca-Gil
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - C Ruiz-Moliner
- Faculty of Medicine, Catholic University of Valencia “San Vicente Martir”, Valencia, Spain
| | - J Jimenez-Bello
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - R De La Espriella
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - D Perdomo
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
| | - B Trejo-Velasco
- University General Hospital of Valencia, Department of Cardiology, Valencia, Spain
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Pineda E, Perdomo D. Entamoeba histolytica under Oxidative Stress: What Countermeasure Mechanisms Are in Place? Cells 2017; 6:cells6040044. [PMID: 29160807 PMCID: PMC5755502 DOI: 10.3390/cells6040044] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [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: 10/25/2017] [Revised: 11/17/2017] [Accepted: 11/17/2017] [Indexed: 02/06/2023] Open
Abstract
Entamoeba histolytica is the causative agent of human amoebiasis; it affects 50 million people worldwide and causes approximately 100,000 deaths per year. Entamoeba histolytica is an anaerobic parasite that is primarily found in the colon; however, for unknown reasons, it can become invasive, breaching the gut barrier and migrating toward the liver causing amoebic liver abscesses. During the invasive process, it must maintain intracellular hypoxia within the oxygenated human tissues and cellular homeostasis during the host immune defense attack when it is confronted with nitric oxide and reactive oxygen species. But how? This review will address the described and potential mechanisms available to counter the oxidative stress generated during invasion and the possible role that E. histolytica’s continuous endoplasmic reticulum (Eh-ER) plays during these events.
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Affiliation(s)
- Erika Pineda
- Laboratory of Fundamental Microbiology and Pathogenicity (MFP), University of Bordeaux, CNRS UMR-5234, 33000 Bordeaux, France.
| | - Doranda Perdomo
- Laboratory of Fundamental Microbiology and Pathogenicity (MFP), University of Bordeaux, CNRS UMR-5234, 33000 Bordeaux, France.
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4
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Lee C, Perdomo D, Czaja S, Schulz R. HISTORICAL TRENDS IN DEMENTIA FAMILY-CARE: A NEW GENERATION OF CAREGIVERS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.2911] [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: 11/13/2022] Open
Affiliation(s)
- C. Lee
- Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, Florida,
| | - D. Perdomo
- Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, Florida,
| | - S.J. Czaja
- Psychiatry and Behavioral Sciences, University of Miami Miller School of Medicine, Miami, Florida,
| | - R. Schulz
- University of Pittsburgh, Pittsburgh, Pennsylvania
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Haggie PM, Phuan PW, Tan JA, Xu H, Avramescu RG, Perdomo D, Zlock L, Nielson DW, Finkbeiner WE, Lukacs GL, Verkman AS. Correctors and Potentiators Rescue Function of the Truncated W1282X-Cystic Fibrosis Transmembrane Regulator (CFTR) Translation Product. J Biol Chem 2016; 292:771-785. [PMID: 27895116 DOI: 10.1074/jbc.m116.764720] [Citation(s) in RCA: 64] [Impact Index Per Article: 8.0] [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: 10/25/2016] [Revised: 11/22/2016] [Indexed: 11/06/2022] Open
Abstract
W1282X is the fifth most common cystic fibrosis transmembrane regulator (CFTR) mutation that causes cystic fibrosis. Here, we investigated the utility of a small molecule corrector/potentiator strategy, as used for ΔF508-CFTR, to produce functional rescue of the truncated translation product of the W1282X mutation, CFTR1281, without the need for read-through. In transfected cell systems, certain potentiators and correctors, including VX-809 and VX-770, increased CFTR1281 activity. To identify novel correctors and potentiators with potentially greater efficacy on CFTR1281, functional screens were done of ∼30,000 synthetic small molecules and drugs/nutraceuticals in CFTR1281-transfected cells. Corrector scaffolds of 1-arylpyrazole-4-arylsulfonyl-piperazine and spiro-piperidine-quinazolinone classes were identified with up to ∼5-fold greater efficacy than VX-809, some of which were selective for CFTR1281, whereas others also corrected ΔF508-CFTR. Several novel potentiator scaffolds were identified with efficacy comparable with VX-770; remarkably, a phenylsulfonamide-pyrrolopyridine acted synergistically with VX-770 to increase CFTR1281 function ∼8-fold over that of VX-770 alone, normalizing CFTR1281 channel activity to that of wild type CFTR. Corrector and potentiator combinations were tested in primary cultures and conditionally reprogrammed cells generated from nasal brushings from one W1282X homozygous subject. Although robust chloride conductance was seen with correctors and potentiators in homozygous ΔF508 cells, increased chloride conductance was not found in W1282X cells despite the presence of adequate transcript levels. Notwithstanding the negative data in W1282X cells from one human subject, we speculate that corrector and potentiator combinations may have therapeutic efficacy in cystic fibrosis caused by the W1282X mutation, although additional studies are needed on human cells from W1282X subjects.
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Affiliation(s)
| | | | | | - Haijin Xu
- the Department of Physiology, McGill University, Montreal, Quebec H3G 1Y6, Canada
| | - Radu G Avramescu
- the Department of Physiology, McGill University, Montreal, Quebec H3G 1Y6, Canada
| | - Doranda Perdomo
- the Department of Physiology, McGill University, Montreal, Quebec H3G 1Y6, Canada
| | | | - Dennis W Nielson
- Pediatrics, University of California, San Francisco, California 94143-0521 and
| | | | - Gergely L Lukacs
- the Department of Physiology, McGill University, Montreal, Quebec H3G 1Y6, Canada
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Veit G, Oliver K, Apaja PM, Perdomo D, Bidaud-Meynard A, Lin ST, Guo J, Icyuz M, Sorscher EJ, Hartman JL, Lukacs GL. Ribosomal Stalk Protein Silencing Partially Corrects the ΔF508-CFTR Functional Expression Defect. PLoS Biol 2016; 14:e1002462. [PMID: 27168400 PMCID: PMC4864299 DOI: 10.1371/journal.pbio.1002462] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2015] [Accepted: 04/14/2016] [Indexed: 01/05/2023] Open
Abstract
The most common cystic fibrosis (CF) causing mutation, deletion of phenylalanine 508 (ΔF508 or Phe508del), results in functional expression defect of the CF transmembrane conductance regulator (CFTR) at the apical plasma membrane (PM) of secretory epithelia, which is attributed to the degradation of the misfolded channel at the endoplasmic reticulum (ER). Deletion of phenylalanine 670 (ΔF670) in the yeast oligomycin resistance 1 gene (YOR1, an ABC transporter) of Saccharomyces cerevisiae phenocopies the ΔF508-CFTR folding and trafficking defects. Genome-wide phenotypic (phenomic) analysis of the Yor1-ΔF670 biogenesis identified several modifier genes of mRNA processing and translation, which conferred oligomycin resistance to yeast. Silencing of orthologues of these candidate genes enhanced the ΔF508-CFTR functional expression at the apical PM in human CF bronchial epithelia. Although knockdown of RPL12, a component of the ribosomal stalk, attenuated the translational elongation rate, it increased the folding efficiency as well as the conformational stability of the ΔF508-CFTR, manifesting in 3-fold augmented PM density and function of the mutant. Combination of RPL12 knockdown with the corrector drug, VX-809 (lumacaftor) restored the mutant function to ~50% of the wild-type channel in primary CFTRΔF508/ΔF508 human bronchial epithelia. These results and the observation that silencing of other ribosomal stalk proteins partially rescue the loss-of-function phenotype of ΔF508-CFTR suggest that the ribosomal stalk modulates the folding efficiency of the mutant and is a potential therapeutic target for correction of the ΔF508-CFTR folding defect. Reducing the rate of translational elongation by silencing ribosomal stalk proteins ameliorates the folding and stability defect of the cystic fibrosis mutant protein ΔF508-CFTR, partially restoring the plasma membrane chloride conductance. Cystic fibrosis (CF) is one of the most common autosomal recessive diseases in Caucasians. It is caused by mutations in the CF transmembrane conductance regulator (CFTR), which functions as an anion channel at the apical plasma membrane of secretory epithelia. The most common CF mutation, a deletion of the phenylalanine residue at position 508 (ΔF508), results in the channel misfolding and subsequent intracellular degradation. Our previous genome-wide phenotypic screens, using a yeast variant, have predicted modifier genes for ΔF508-CFTR biogenesis. Here, we show that silencing of one of these candidate genes, RPL12, a component of the ribosomal stalk, increased the folding and stabilization of ΔF508-CFTR, resulting in its increased plasma membrane expression and function. Our data suggest that reducing the translational elongation rate via RPL12 silencing can partially reverse the ΔF508-CFTR folding defect. Importantly, RPL12 silencing in combination with the corrector drug VX-809 (lumacaftor), increased the mutant function to 50% of the wild-type CFTR channel, suggesting that the ribosomal stalk perturbation may represent a therapeutic target for rescuing the ΔF508-CFTR biogenesis defect.
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Affiliation(s)
- Guido Veit
- Department of Physiology, McGill University, Montréal, Quebec, Canada
| | - Kathryn Oliver
- Department of Genetics, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Pirjo M. Apaja
- Department of Physiology, McGill University, Montréal, Quebec, Canada
| | - Doranda Perdomo
- Department of Physiology, McGill University, Montréal, Quebec, Canada
| | | | - Sheng-Ting Lin
- Department of Physiology, McGill University, Montréal, Quebec, Canada
| | - Jingyu Guo
- Department of Genetics, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Mert Icyuz
- Department of Genetics, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
| | - Eric J. Sorscher
- Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia, United States of America
| | - John L. Hartman
- Department of Genetics, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
- Gregory Fleming James Cystic Fibrosis Research Center, University of Alabama at Birmingham, Birmingham, Alabama, United States of America
- * E-mail: (JLH); (GLL)
| | - Gergely L. Lukacs
- Department of Physiology, McGill University, Montréal, Quebec, Canada
- Department of Biochemistry, McGill University, Montréal, Quebec, Canada
- Groupe de Recherche Axé sur la Structure des Protéines (GRASP), McGill University, Montréal, Quebec, Canada
- * E-mail: (JLH); (GLL)
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Perdomo D, Bonhivers M, Robinson DR. The Trypanosome Flagellar Pocket Collar and Its Ring Forming Protein-TbBILBO1. Cells 2016; 5:cells5010009. [PMID: 26950156 PMCID: PMC4810094 DOI: 10.3390/cells5010009] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [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: 12/22/2015] [Revised: 02/19/2016] [Accepted: 02/23/2016] [Indexed: 12/11/2022] Open
Abstract
Sub-species of Trypanosoma brucei are the causal agents of human African sleeping sickness and Nagana in domesticated livestock. These pathogens have developed an organelle-like compartment called the flagellar pocket (FP). The FP carries out endo- and exocytosis and is the only structure this parasite has evolved to do so. The FP is essential for parasite viability, making it an interesting structure to evaluate as a drug target, especially since it has an indispensible cytoskeleton component called the flagellar pocket collar (FPC). The FPC is located at the neck of the FP where the flagellum exits the cell. The FPC has a complex architecture and division cycle, but little is known concerning its organization. Recent work has focused on understanding how the FP and the FPC are formed and as a result of these studies an important calcium-binding, polymer-forming protein named TbBILBO1 was identified. Cellular biology analysis of TbBILBO1 has demonstrated its uniqueness as a FPC component and until recently, it was unknown what structural role it played in forming the FPC. This review summarizes the recent data on the polymer forming properties of TbBILBO1 and how these are correlated to the FP cytoskeleton.
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Affiliation(s)
- Doranda Perdomo
- CNRS, Microbiology Fundamental and Pathogenicity, UMR 5234, F-33000 Bordeaux, France.
| | - Mélanie Bonhivers
- CNRS, Microbiology Fundamental and Pathogenicity, UMR 5234, F-33000 Bordeaux, France.
| | - Derrick R Robinson
- CNRS, Microbiology Fundamental and Pathogenicity, UMR 5234, F-33000 Bordeaux, France.
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Perdomo D, Manich M, Syan S, Olivo-Marin JC, Dufour AC, Guillén N. Intracellular traffic of the lysine and glutamic acid rich protein KERP1 reveals features of endomembrane organization in Entamoeba histolytica. Cell Microbiol 2016; 18:1134-52. [PMID: 26857352 DOI: 10.1111/cmi.12576] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Revised: 01/06/2016] [Accepted: 02/01/2016] [Indexed: 12/12/2022]
Abstract
The development of amoebiasis is influenced by the expression of the lysine and glutamic acid rich protein 1 (KERP1), a virulence factor involved in Entamoeba histolytica adherence to human cells. Up to date, it is unknown how the protein transits the parasite cytoplasm towards the plasma membrane, specially because this organism lacks a well-defined endoplasmic reticulum (ER) and Golgi apparatus. In this work we demonstrate that KERP1 is present at the cell surface and in intracellular vesicles which traffic in a pathway that is independent of the ER-Golgi anterograde transport. The intracellular displacement of vesicles enriched in KERP1 relies on the actin-rich cytoskeleton activities. KERP1 is also present in externalized vesicles deposited on the surface of human cells. We further report the interactome of KERP1 with its association to endomembrane components and lipids. The model for KERP1 traffic here proposed hints for the first time elements of the endocytic and exocytic paths of E. histolytica.
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Affiliation(s)
- Doranda Perdomo
- Cell Biology of Parasitism Unit, Institut Pasteur, Paris, France.,INSERM U786, Paris, France.,Sorbonne Paris Cité, Cellule Pasteur, Université Paris Diderot, Paris, France
| | - Maria Manich
- Cell Biology of Parasitism Unit, Institut Pasteur, Paris, France.,INSERM U786, Paris, France
| | - Sylvie Syan
- Cell Biology of Parasitism Unit, Institut Pasteur, Paris, France.,INSERM U786, Paris, France
| | | | - Alexandre C Dufour
- Bioimage Analysis Unit, Institut Pasteur, Paris, France.,CNRS UMR 3691, Paris, France
| | - Nancy Guillén
- Cell Biology of Parasitism Unit, Institut Pasteur, Paris, France.,INSERM U786, Paris, France
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Veit G, Avramescu RG, Perdomo D, Phuan PW, Bagdany M, Apaja PM, Borot F, Szollosi D, Wu YS, Finkbeiner WE, Hegedus T, Verkman AS, Lukacs GL. Some gating potentiators, including VX-770, diminish ΔF508-CFTR functional expression. Sci Transl Med 2015; 6:246ra97. [PMID: 25101887 DOI: 10.1126/scitranslmed.3008889] [Citation(s) in RCA: 240] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Cystic fibrosis (CF) is caused by mutations in the CF transmembrane regulator (CFTR) that result in reduced anion conductance at the apical membrane of secretory epithelia. Treatment of CF patients carrying the G551D gating mutation with the potentiator VX-770 (ivacaftor) largely restores channel activity and has shown substantial clinical benefit. However, most CF patients carry the ΔF508 mutation, which impairs CFTR folding, processing, function, and stability. Studies in homozygous ΔF508 CF patients indicated little clinical benefit of monotherapy with the investigational corrector VX-809 (lumacaftor) or VX-770, whereas combination clinical trials show limited but significant improvements in lung function. We show that VX-770, as well as most other potentiators, reduces the correction efficacy of VX-809 and another investigational corrector, VX-661. To mimic the administration of VX-770 alone or in combination with VX-809, we examined its long-term effect in immortalized and primary human respiratory epithelia. VX-770 diminished the folding efficiency and the metabolic stability of ΔF508-CFTR at the endoplasmic reticulum (ER) and post-ER compartments, respectively, causing reduced cell surface ΔF508-CFTR density and function. VX-770-induced destabilization of ΔF508-CFTR was influenced by second-site suppressor mutations of the folding defect and was prevented by stabilization of the nucleotide-binding domain 1 (NBD1)-NBD2 interface. The reduced correction efficiency of ΔF508-CFTR, as well as of two other processing mutations in the presence of VX-770, suggests the need for further optimization of potentiators to maximize the clinical benefit of corrector-potentiator combination therapy in CF.
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Affiliation(s)
- Guido Veit
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Radu G Avramescu
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Doranda Perdomo
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Puay-Wah Phuan
- Departments of Medicine and Physiology, University of California, San Francisco, San Francisco, CA 94143-0521, USA
| | - Miklos Bagdany
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Pirjo M Apaja
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Florence Borot
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Daniel Szollosi
- MTA-SE Molecular Biophysics Research Group, Hungarian Academy of Sciences, 1444 Budapest, Hungary. Department of Biophysics and Radiation Biology, Semmelweis University, 1444 Budapest P.O. Box 263, Hungary
| | - Yu-Sheng Wu
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Walter E Finkbeiner
- Department of Pathology, University of California, San Francisco, San Francisco, CA 94143-0511, USA
| | - Tamas Hegedus
- MTA-SE Molecular Biophysics Research Group, Hungarian Academy of Sciences, 1444 Budapest, Hungary. Department of Biophysics and Radiation Biology, Semmelweis University, 1444 Budapest P.O. Box 263, Hungary
| | - Alan S Verkman
- Departments of Medicine and Physiology, University of California, San Francisco, San Francisco, CA 94143-0521, USA
| | - Gergely L Lukacs
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada. Department of Biochemistry, McGill University, Montréal, Quebec H3G 1Y6, Canada. Groupe de Recherche Axé sur la Structure des Protéines (GRASP), McGill University, Montréal, Quebec H3G 1Y6, Canada.
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10
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Maléth J, Balázs A, Pallagi P, Balla Z, Kui B, Katona M, Judák L, Németh I, Kemény LV, Rakonczay Z, Venglovecz V, Földesi I, Pető Z, Somorácz Á, Borka K, Perdomo D, Lukacs GL, Gray MA, Monterisi S, Zaccolo M, Sendler M, Mayerle J, Kühn JP, Lerch MM, Sahin-Tóth M, Hegyi P. Alcohol disrupts levels and function of the cystic fibrosis transmembrane conductance regulator to promote development of pancreatitis. Gastroenterology 2015; 148:427-39.e16. [PMID: 25447846 PMCID: PMC4353632 DOI: 10.1053/j.gastro.2014.11.002] [Citation(s) in RCA: 133] [Impact Index Per Article: 14.8] [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: 03/18/2014] [Revised: 10/23/2014] [Accepted: 11/04/2014] [Indexed: 02/07/2023]
Abstract
BACKGROUND & AIMS Excessive consumption of ethanol is one of the most common causes of acute and chronic pancreatitis. Alterations to the gene encoding the cystic fibrosis transmembrane conductance regulator (CFTR) also cause pancreatitis. However, little is known about the role of CFTR in the pathogenesis of alcohol-induced pancreatitis. METHODS We measured CFTR activity based on chloride concentrations in sweat from patients with cystic fibrosis, patients admitted to the emergency department because of excessive alcohol consumption, and healthy volunteers. We measured CFTR levels and localization in pancreatic tissues and in patients with acute or chronic pancreatitis induced by alcohol. We studied the effects of ethanol, fatty acids, and fatty acid ethyl esters on secretion of pancreatic fluid and HCO3(-), levels and function of CFTR, and exchange of Cl(-) for HCO3(-) in pancreatic cell lines as well as in tissues from guinea pigs and CFTR knockout mice after administration of alcohol. RESULTS Chloride concentrations increased in sweat samples from patients who acutely abused alcohol but not in samples from healthy volunteers, indicating that alcohol affects CFTR function. Pancreatic tissues from patients with acute or chronic pancreatitis had lower levels of CFTR than tissues from healthy volunteers. Alcohol and fatty acids inhibited secretion of fluid and HCO3(-), as well as CFTR activity, in pancreatic ductal epithelial cells. These effects were mediated by sustained increases in concentrations of intracellular calcium and adenosine 3',5'-cyclic monophosphate, depletion of adenosine triphosphate, and depolarization of mitochondrial membranes. In pancreatic cell lines and pancreatic tissues of mice and guinea pigs, administration of ethanol reduced expression of CFTR messenger RNA, reduced the stability of CFTR at the cell surface, and disrupted folding of CFTR at the endoplasmic reticulum. CFTR knockout mice given ethanol or fatty acids developed more severe pancreatitis than mice not given ethanol or fatty acids. CONCLUSIONS Based on studies of human, mouse, and guinea pig pancreata, alcohol disrupts expression and localization of the CFTR. This appears to contribute to development of pancreatitis. Strategies to increase CFTR levels or function might be used to treat alcohol-associated pancreatitis.
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Affiliation(s)
- József Maléth
- First Department of Medicine, University of Szeged, Szeged, Hungary
| | - Anita Balázs
- First Department of Medicine, University of Szeged, Szeged, Hungary
| | - Petra Pallagi
- First Department of Medicine, University of Szeged, Szeged, Hungary
| | - Zsolt Balla
- First Department of Medicine, University of Szeged, Szeged, Hungary
| | - Balázs Kui
- First Department of Medicine, University of Szeged, Szeged, Hungary
| | - Máté Katona
- First Department of Medicine, University of Szeged, Szeged, Hungary
| | - Linda Judák
- First Department of Medicine, University of Szeged, Szeged, Hungary,Department of Pharmacology and Pharmacotherapy, University of Szeged, Szeged, Hungary
| | - István Németh
- Department of Dermatology and Allergology, University of Szeged, Szeged, Hungary
| | - Lajos V. Kemény
- First Department of Medicine, University of Szeged, Szeged, Hungary
| | - Zoltán Rakonczay
- First Department of Medicine, University of Szeged, Szeged, Hungary
| | - Viktória Venglovecz
- Department of Pharmacology and Pharmacotherapy, University of Szeged, Szeged, Hungary
| | - Imre Földesi
- Department of Laboratory Medicine, University of Szeged, Szeged, Hungary
| | - Zoltán Pető
- Department of Emergency Medicine, University of Szeged, Szeged, Hungary
| | - Áron Somorácz
- Second Department of Pathology, Semmelweis University, Budapest, Hungary
| | - Katalin Borka
- Second Department of Pathology, Semmelweis University, Budapest, Hungary
| | - Doranda Perdomo
- Department of Physiology, McGill University, Montreal, Quebec, Canada
| | - Gergely L. Lukacs
- Department of Physiology, McGill University, Montreal, Quebec, Canada
| | - Mike A. Gray
- Institute for Cell & Molecular Biosciences, Newcastle University, Newcastle upon Tyne, England
| | - Stefania Monterisi
- Department of Physiology, Anatomy and Genetics, Oxford University, Oxford, England
| | - Manuela Zaccolo
- Department of Physiology, Anatomy and Genetics, Oxford University, Oxford, England
| | - Matthias Sendler
- Department of Medicine A, University Medicine Greifswald, Greifswald, Germany
| | - Julia Mayerle
- Department of Medicine A, University Medicine Greifswald, Greifswald, Germany
| | - Jens-Peter Kühn
- Institute of Radiology, University Medicine, Ernst Moritz University, Greifswald, Germany
| | - Markus M. Lerch
- Department of Medicine A, University Medicine Greifswald, Greifswald, Germany
| | - Miklós Sahin-Tóth
- Department of Molecular and Cell Biology, Henry M. Goldman School of Dental Medicine, Boston University, Boston, Massachusetts
| | - Péter Hegyi
- First Department of Medicine, University of Szeged, Szeged, Hungary; MTA-SZTE Lendület Translational Gastroenterology Research Group, Szeged, Hungary.
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Perdomo D, Aït-Ammar N, Syan S, Sachse M, Jhingan GD, Guillén N. Cellular and proteomics analysis of the endomembrane system from the unicellular Entamoeba histolytica. J Proteomics 2015; 112:125-40. [DOI: 10.1016/j.jprot.2014.07.034] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 07/11/2014] [Accepted: 07/18/2014] [Indexed: 12/27/2022]
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Solis CF, Santi-Rocca J, Perdomo D, Weber C, Guillén N. Use of bacterially expressed dsRNA to downregulate Entamoeba histolytica gene expression. PLoS One 2009; 4:e8424. [PMID: 20037645 PMCID: PMC2793006 DOI: 10.1371/journal.pone.0008424] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2009] [Accepted: 11/24/2009] [Indexed: 11/18/2022] Open
Abstract
Background Modern RNA interference (RNAi) methodologies using small interfering RNA (siRNA) oligonucleotide duplexes or episomally synthesized hairpin RNA are valuable tools for the analysis of gene function in the protozoan parasite Entamoeba histolytica. However, these approaches still require time-consuming procedures including transfection and drug selection, or costly synthetic molecules. Principal Findings Here we report an efficient and handy alternative for E. histolytica gene down-regulation mediated by bacterial double-stranded RNA (dsRNA) targeting parasite genes. The Escherichia coli strain HT115 which is unable to degrade dsRNA, was genetically engineered to produce high quantities of long dsRNA segments targeting the genes that encode E. histolytica β-tubulin and virulence factor KERP1. Trophozoites cultured in vitro were directly fed with dsRNA-expressing bacteria or soaked with purified dsRNA. Both dsRNA delivery methods resulted in significant reduction of protein expression. In vitro host cell-parasite assays showed that efficient downregulation of kerp1 gene expression mediated by bacterial dsRNA resulted in significant reduction of parasite adhesion and lytic capabilities, thus supporting a major role for KERP1 in the pathogenic process. Furthermore, treatment of trophozoites cultured in microtiter plates, with a repertoire of eighty-five distinct bacterial dsRNA segments targeting E. histolytica genes with unknown function, led to the identification of three genes potentially involved in the growth of the parasite. Conclusions Our results showed that the use of bacterial dsRNA is a powerful method for the study of gene function in E. histolytica. This dsRNA delivery method is also technically suitable for the study of a large number of genes, thus opening interesting perspectives for the identification of novel drug and vaccine targets.
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Affiliation(s)
- Carlos F. Solis
- Institut Pasteur, Unité Biologie Cellulaire du Parasitisme, Paris, France
- INSERM U786, Paris, France
| | - Julien Santi-Rocca
- Institut Pasteur, Unité Biologie Cellulaire du Parasitisme, Paris, France
- INSERM U786, Paris, France
| | - Doranda Perdomo
- Institut Pasteur, Unité Biologie Cellulaire du Parasitisme, Paris, France
- INSERM U786, Paris, France
| | - Christian Weber
- Institut Pasteur, Unité Biologie Cellulaire du Parasitisme, Paris, France
- INSERM U786, Paris, France
| | - Nancy Guillén
- Institut Pasteur, Unité Biologie Cellulaire du Parasitisme, Paris, France
- INSERM U786, Paris, France
- * E-mail:
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Tiffert T, Daw N, Perdomo D, Lew VL. A fast and simple screening test to search for specific inhibitors of the plasma membrane calcium pump. J Lab Clin Med 2001; 137:199-207. [PMID: 11241030 DOI: 10.1067/mlc.2001.113112] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
No specific inhibitors of the plasma membrane Ca(2+) pump have been found to date, limiting research on the particular contribution of this pump to the Ca(2+) homeostasis of animal cells. The search for Ca(2+) pump inhibitors may have been hampered by the lack of an efficient screening method to measure pump activity that would provide an alternative to the lengthy and costly adenosine triphosphatase or Ca(2+)-flux measurements. We propose here a novel screening method in which Ca(2+) pump inhibition is translated into easily measurable cell dehydration. Intact human red cells, suspended in Ca(2+)-containing, low-K(+) buffers were exposed to sequential additions of (1) ionophore A23187 (t = 0) to load the cells with Ca(2+); (2) CoCl(2) (t = 1 minute) to block ionophore-mediated Ca(2+) transport and to allow complete extrusion of the Ca(2+) load by the pump in less than 5 minutes; and (3) NaSCN (t = 6 minutes) to accelerate cell dehydration via Ca(2+)-sensitive K(+) channels when the Ca(2+) load is retained as a result of Ca(2+) pump inhibition. Samples were taken at 10 to 25 minutes after ionophore addition and delivered into hypotonic media containing about 45 mmol/L NaCl. Non-dehydrated cells-with normal, uninhibited pumps-instantly underwent lysis, whereas dehydrated cells-with inhibited pumps-resisted lysis, resulting in translucent or opaque samples, respectively, which were quantifiable by light-absorption measurements. Vanadate was used as a test substance to assess the effect of putative pump inhibitors. This method offers a cost-efficient and easily automated alternative for testing large numbers of natural or synthetic agents.
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Affiliation(s)
- T Tiffert
- Physiological Laboratory, University of Cambridge, United Kingdom
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Abstract
Previous studies have shown that ferriprotoporphyrin IX (FP) and non-heme iron have a marked inhibitory effect on the Ca(2+)-Mg(2+)-ATPase activity of isolated red cell membranes, the biochemical counterpart of the plasma membrane Ca(2+) pump (PMCA). High levels of membrane-bound FP and non-heme iron have been found in abnormal red cells such as sickle cells and malaria-infected red cells, associated with a reduced life span. It was important to establish whether sublytic concentrations of FP and non-heme iron would also inhibit the PMCA in normal red cells, to assess the possible role of these agents in the altered Ca(2+) homeostasis of abnormal cells. Active Ca(2+) extrusion by the plasma membrane Ca(2+) pump was measured in intact red cells that had been briefly preloaded with Ca(2+) by means of the ionophore A23187. The FP and nonheme iron concentrations used in this study were within the range of those applied to the isolated red cell membrane preparations. The results showed that FP caused a marginal inhibition ( approximately 20%) of pump-mediated Ca(2+) extrusion and that non-heme iron induced a slight stimulation of the Ca(2+) efflux (11-20%), in contrast to the marked inhibitory effects on the Ca(2+)-Mg(2+)-ATPase of isolated membranes. Thus, FP and non-heme iron are unlikely to play a significant role in the altered Ca(2+) homeostasis of abnormal red cells.
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Affiliation(s)
- T Tiffert
- Physiological Laboratory, University of Cambridge, Downing Street, Cambridge CB2 3EG, United Kingdom
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