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Borgo C, D’Amore C, Capurro V, Tomati V, Pedemonte N, Bosello Travain V, Salvi M. SUMOylation Inhibition Enhances Protein Transcription under CMV Promoter: A Lesson from a Study with the F508del-CFTR Mutant. Int J Mol Sci 2024; 25:2302. [PMID: 38396982 PMCID: PMC10889535 DOI: 10.3390/ijms25042302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 02/02/2024] [Accepted: 02/11/2024] [Indexed: 02/25/2024] Open
Abstract
Cystic fibrosis (CF) is a genetic disorder caused by mutations in the gene encoding the cystic fibrosis transmembrane conductance regulator (CFTR), a selective anion channel expressed in the epithelium of various organs. The most frequent mutation is F508del. This mutation leads to a misfolded CFTR protein quickly degraded via ubiquitination in the endoplasmic reticulum. Although preventing ubiquitination stabilizes the protein, functionality is not restored due to impaired plasma membrane transport. However, inhibiting the ubiquitination process can improve the effectiveness of correctors which act as chemical chaperones, facilitating F508del CFTR trafficking to the plasma membrane. Previous studies indicate a crosstalk between SUMOylation and ubiquitination in the regulation of CFTR. In this study, we investigated the potential of inhibiting SUMOylation to increase the effects of correctors and enhance the rescue of the F508del mutant across various cell models. In the widely used CFBE41o-cell line expressing F508del-CFTR, inhibiting SUMOylation substantially boosted F508del expression, thereby increasing the efficacy of correctors. Interestingly, this outcome did not result from enhanced stability of the mutant channel, but rather from augmented cytomegalovirus (CMV) promoter-mediated gene expression of F508del-CFTR. Notably, CFTR regulated by endogenous promoters in multiple cell lines or patient cells was not influenced by SUMOylation inhibitors.
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Affiliation(s)
- Christian Borgo
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy; (C.B.); (C.D.)
| | - Claudio D’Amore
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy; (C.B.); (C.D.)
| | - Valeria Capurro
- UOC Genetica Medica, IRCCS Istituto Giannina Gaslini, Via Gerolamo Gaslini 5, 16147 Genova, Italy; (V.C.); (V.T.); (N.P.)
| | - Valeria Tomati
- UOC Genetica Medica, IRCCS Istituto Giannina Gaslini, Via Gerolamo Gaslini 5, 16147 Genova, Italy; (V.C.); (V.T.); (N.P.)
| | - Nicoletta Pedemonte
- UOC Genetica Medica, IRCCS Istituto Giannina Gaslini, Via Gerolamo Gaslini 5, 16147 Genova, Italy; (V.C.); (V.T.); (N.P.)
| | | | - Mauro Salvi
- Department of Biomedical Sciences, University of Padova, 35131 Padova, Italy; (C.B.); (C.D.)
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Santinelli R, Benz N, Guellec J, Quinquis F, Kocas E, Thomas J, Montier T, Ka C, Luczka-Majérus E, Sage E, Férec C, Coraux C, Trouvé P. The Inhibition of the Membrane-Bound Transcription Factor Site-1 Protease (MBTP1) Alleviates the p.Phe508del-Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) Defects in Cystic Fibrosis Cells. Cells 2024; 13:185. [PMID: 38247876 PMCID: PMC10814821 DOI: 10.3390/cells13020185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 12/27/2023] [Accepted: 01/11/2024] [Indexed: 01/23/2024] Open
Abstract
Cystic Fibrosis (CF) is present due to mutations in the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) gene, the most frequent variant being p.phe508del. The CFTR protein is a chloride (Cl-) channel which is defective and almost absent of cell membranes when the p.Phe508del mutation is present. The p.Phe508del-CFTR protein is retained in the endoplasmic reticulum (ER) and together with inflammation and infection triggers the Unfolded Protein Response (UPR). During the UPR, the Activating Transcription Factor 6 (ATF6) is activated with cleavage and then decreases the expression of p.Phe508del-CFTR. We have previously shown that the inhibition of the activation of ATF6 alleviates the p.Phe508del-CFTR defects in cells overexpressing the mutated protein. In the present paper, our aim was to inhibit the cleavage of ATF6, and thus its activation in a human bronchial cell line with endogenous p.Phe508del-CFTR expression and in bronchial cells from patients, to be more relevant to CF. This was achieved by inhibiting the protease MBTP1 which is responsible for the cleavage of ATF6. We show here that this inhibition leads to increased mRNA and p.Phe508del-CFTR expression and, consequently, to increased Cl-efflux. We also explain the mechanisms linked to these increases with the modulation of genes when MBTP1 is inhibited. Indeed, RT-qPCR assays show that genes such as HSPA1B, CEBPB, VIMP, PFND2, MAPK8, XBP1, INSIG1, and CALR are modulated. In conclusion, we show that the inhibition of MBTP1 has a beneficial effect in relevant models to CF and that this is due to the modulation of genes involved in the disease.
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Affiliation(s)
- Raphaël Santinelli
- Univ Brest, Inserm, EFS, UMR 1078, 22 Avenue Camille Desmoulins, F-29200 Brest, France; (R.S.); (N.B.); (J.G.); (F.Q.); (E.K.); (J.T.); (T.M.); (C.K.); (C.F.)
| | - Nathalie Benz
- Univ Brest, Inserm, EFS, UMR 1078, 22 Avenue Camille Desmoulins, F-29200 Brest, France; (R.S.); (N.B.); (J.G.); (F.Q.); (E.K.); (J.T.); (T.M.); (C.K.); (C.F.)
| | - Julie Guellec
- Univ Brest, Inserm, EFS, UMR 1078, 22 Avenue Camille Desmoulins, F-29200 Brest, France; (R.S.); (N.B.); (J.G.); (F.Q.); (E.K.); (J.T.); (T.M.); (C.K.); (C.F.)
| | - Fabien Quinquis
- Univ Brest, Inserm, EFS, UMR 1078, 22 Avenue Camille Desmoulins, F-29200 Brest, France; (R.S.); (N.B.); (J.G.); (F.Q.); (E.K.); (J.T.); (T.M.); (C.K.); (C.F.)
| | - Ervin Kocas
- Univ Brest, Inserm, EFS, UMR 1078, 22 Avenue Camille Desmoulins, F-29200 Brest, France; (R.S.); (N.B.); (J.G.); (F.Q.); (E.K.); (J.T.); (T.M.); (C.K.); (C.F.)
| | - Johan Thomas
- Univ Brest, Inserm, EFS, UMR 1078, 22 Avenue Camille Desmoulins, F-29200 Brest, France; (R.S.); (N.B.); (J.G.); (F.Q.); (E.K.); (J.T.); (T.M.); (C.K.); (C.F.)
| | - Tristan Montier
- Univ Brest, Inserm, EFS, UMR 1078, 22 Avenue Camille Desmoulins, F-29200 Brest, France; (R.S.); (N.B.); (J.G.); (F.Q.); (E.K.); (J.T.); (T.M.); (C.K.); (C.F.)
| | - Chandran Ka
- Univ Brest, Inserm, EFS, UMR 1078, 22 Avenue Camille Desmoulins, F-29200 Brest, France; (R.S.); (N.B.); (J.G.); (F.Q.); (E.K.); (J.T.); (T.M.); (C.K.); (C.F.)
| | - Emilie Luczka-Majérus
- Inserm UMR-S 1250, University of Reims Champagne-Ardenne (URCA), SFR Cap-Santé, F-51100 Reims, France; (E.L.-M.); (C.C.)
| | - Edouard Sage
- Université Paris-Saclay, INRAE, UVSQ, VIM, F-78350 Jouy-en-Josas, France;
| | - Claude Férec
- Univ Brest, Inserm, EFS, UMR 1078, 22 Avenue Camille Desmoulins, F-29200 Brest, France; (R.S.); (N.B.); (J.G.); (F.Q.); (E.K.); (J.T.); (T.M.); (C.K.); (C.F.)
| | - Christelle Coraux
- Inserm UMR-S 1250, University of Reims Champagne-Ardenne (URCA), SFR Cap-Santé, F-51100 Reims, France; (E.L.-M.); (C.C.)
| | - Pascal Trouvé
- Univ Brest, Inserm, EFS, UMR 1078, 22 Avenue Camille Desmoulins, F-29200 Brest, France; (R.S.); (N.B.); (J.G.); (F.Q.); (E.K.); (J.T.); (T.M.); (C.K.); (C.F.)
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Ondra M, Lenart L, Centorame A, Dumut DC, He A, Zaidi SSZ, Hanrahan JW, De Sanctis JB, Radzioch D, Hajduch M. CRISPR/Cas9 bioluminescence-based assay for monitoring CFTR trafficking to the plasma membrane. Life Sci Alliance 2024; 7:e202302045. [PMID: 37918963 PMCID: PMC10622324 DOI: 10.26508/lsa.202302045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 10/20/2023] [Accepted: 10/20/2023] [Indexed: 11/04/2023] Open
Abstract
CFTR is a membrane protein that functions as an ion channel. Mutations that disrupt its biosynthesis, trafficking or function cause cystic fibrosis (CF). Here, we present a novel in vitro model system prepared using CRISPR/Cas9 genome editing with endogenously expressed WT-CFTR tagged with a HiBiT peptide. To enable the detection of CFTR in the plasma membrane of live cells, we inserted the HiBiT tag in the fourth extracellular loop of WT-CFTR. The 11-amino acid HiBiT tag binds with high affinity to a large inactive subunit (LgBiT), generating a reporter luciferase with bright luminescence. Nine homozygous clones with the HiBiT knock-in were identified from the 182 screened clones; two were genetically and functionally validated. In summary, this work describes the preparation and validation of a novel reporter cell line with the potential to be used as an ultimate building block for developing unique cellular CF models by CRISPR-mediated insertion of CF-causing mutations.
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Affiliation(s)
- Martin Ondra
- https://ror.org/04qxnmv42 Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
- https://ror.org/04qxnmv42 Czech Advanced Technology and Research Institute, Palacky University, Olomouc, Czech Republic
| | - Lukas Lenart
- https://ror.org/04qxnmv42 Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
| | - Amanda Centorame
- https://ror.org/01pxwe438 Faculty of Medicine and Health Sciences, McGill University, Montreal, Canada
- RI-MUHC, Montreal, Canada
| | - Daciana C Dumut
- https://ror.org/01pxwe438 Faculty of Medicine and Health Sciences, McGill University, Montreal, Canada
- RI-MUHC, Montreal, Canada
| | - Alexander He
- https://ror.org/01pxwe438 Physiology, McGill University, Montreal, Canada
| | | | - John W Hanrahan
- RI-MUHC, Montreal, Canada
- https://ror.org/01pxwe438 Physiology, McGill University, Montreal, Canada
| | - Juan Bautista De Sanctis
- https://ror.org/04qxnmv42 Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
| | - Danuta Radzioch
- https://ror.org/04qxnmv42 Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
- https://ror.org/01pxwe438 Faculty of Medicine and Health Sciences, McGill University, Montreal, Canada
- RI-MUHC, Montreal, Canada
| | - Marian Hajduch
- https://ror.org/04qxnmv42 Institute of Molecular and Translational Medicine, Faculty of Medicine and Dentistry, Palacky University, Olomouc, Czech Republic
- https://ror.org/04qxnmv42 Czech Advanced Technology and Research Institute, Palacky University, Olomouc, Czech Republic
- Laboratory of Experimental Medicine, Institute of Molecular and Translational Medicine, University Hospital Olomouc, Olomouc, Czech Republic
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Illek B, Fischer H, Machen TE, Hari G, Clemons KV, Sass G, Ferreira JAG, Stevens DA. Protective role of CFTR during fungal infection of cystic fibrosis bronchial epithelial cells with Aspergillus fumigatus. Front Cell Infect Microbiol 2023; 13:1196581. [PMID: 37680748 PMCID: PMC10482090 DOI: 10.3389/fcimb.2023.1196581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Accepted: 06/19/2023] [Indexed: 09/09/2023] Open
Abstract
Lung infection with the fungus Aspergillus fumigatus (Af) is a common complication in cystic fibrosis (CF) and is associated with loss of pulmonary function. We established a fungal epithelial co-culture model to examine the impact of Af infection on CF bronchial epithelial barrier function using Af strains 10AF and AF293-GFP, and the CFBE41o- cell line homozygous for the F508del mutation with (CF+CFTR) and without (CF) normal CFTR expression. Following exposure of the epithelial surface to Af conidia, formation of germlings (early stages of fungal growth) was detected after 9-12 hours and hyphae (mature fungal growth) after 12-24 hours. During fungal morphogenesis, bronchial epithelial cells showed signs of damage including rounding, and partial detachment after 24 hours. Fluorescently labeled conidia were internalized after 6 hours and more internalized conidia were observed in CF compared to CF+CFTR cells. Infection of the apical surface with 10AF conidia, germlings, or hyphae was performed to determine growth stage-specific effects on tight junction protein zona occludens protein 1 (ZO-1) expression and transepithelial electrical resistance (TER). In response to infection with conidia or germlings, epithelial barrier function degraded time-dependently (based on ZO-1 immunofluorescence and TER) with a delayed onset in CF+CFTR cell monolayers and required viable fungi and apical application. Infection with hyphae caused an earlier onset and faster rate of decline in TER compared to conidia and germlings. Gliotoxin, a major Af virulence factor, caused a rapid decline in TER and induced a transient chloride secretory response in CF+CFTR but not CF cells. Our findings suggest growth and internalization of Af result in deleterious effects on bronchial epithelial barrier function that occurred more rapidly in the absence of CFTR. Bronchial epithelial barrier breakdown was time-dependent and morphotype-specific and mimicked by acute administration of gliotoxin. Our study also suggests a protective role for CFTR by turning on CFTR-dependent chloride transport in response to gliotoxin, a mechanism that will support mucociliary clearance, and could delay the loss of epithelial integrity during fungal development in vivo.
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Affiliation(s)
- Beate Illek
- UCSF Benioff Children's Hospital Oakland, Children's Hospital Oakland Research Institute, Oakland, CA, United States
| | - Horst Fischer
- UCSF Benioff Children's Hospital Oakland, Children's Hospital Oakland Research Institute, Oakland, CA, United States
| | - Terry E. Machen
- Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA, United States
| | - Gopika Hari
- UCSF Benioff Children's Hospital Oakland, Children's Hospital Oakland Research Institute, Oakland, CA, United States
| | - Karl V. Clemons
- California Institute for Medical Research, San Jose, CA, United States
- Division of Infectious Diseases and Geographic Medicine, Stanford University Medical School, Stanford, CA, United States
| | - Gabriele Sass
- California Institute for Medical Research, San Jose, CA, United States
| | - Jose A. G. Ferreira
- California Institute for Medical Research, San Jose, CA, United States
- Division of Infectious Diseases and Geographic Medicine, Stanford University Medical School, Stanford, CA, United States
| | - David A. Stevens
- California Institute for Medical Research, San Jose, CA, United States
- Division of Infectious Diseases and Geographic Medicine, Stanford University Medical School, Stanford, CA, United States
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5
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Lu S, Kolls JK. Multi-omic comparisons between CFBE41o- cells stably expressing wild-type CFTR and F508del-mutant CFTR. J Cyst Fibros 2023; 22:146-155. [PMID: 35803883 DOI: 10.1016/j.jcf.2022.06.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 06/21/2022] [Accepted: 06/21/2022] [Indexed: 11/28/2022]
Abstract
BACKGROUND Cystic fibrosis (CF) is characterized by chronic inflammation and excessive cytokines secretion in the lung. Isogenic human CF bronchial epithelial (CFBE41o-) cell lines stably expressing wt-CFTR (WTBE) or F508del mutant (CFBE) are widely used tools in understanding responses to stimuli or drugs and CF pathogenesis in vitro. However, the intrinsic cellular differences in culture are unknown. METHODS We performed integrative analyses of these isogenic cells at the protein, mRNA, and chromatin levels in the submerged and air-liquid interface (ALI) conditions to determine cell intrinsic effects of mutant versus complemented CFTR expression. RESULTS CFBE and WTBE cells displayed different cytokine secretion patterns, including IL-6, IL-8, CXCL1, CXCL10, and CCL5. The ALI culture dramatically increased cytokine secretion in both cells. Assay for transposase-accessible chromatin using sequencing (ATAC-seq) result showed different chromatin landscapes upon polarization and CFBE cells, compared to WTBE cells, exhibited higher genome-wide chromatin accessibility under both culture methods. At the transcriptome level, differentially expressed genes identified by mRNA sequencing between two cell lines were highly concentrated in immunity-related pathways. CONCLUSIONS This multilayered study shows that expression of wild-type CFTR has an epithelial cell intrinsic effect on the cell's epigenome and transcriptome particularly in immunity relevant activities. These data will serve as a resource for the CF community and may serve as epithelial biomarkers for CFTR mRNA therapy.
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Affiliation(s)
- Shiping Lu
- Department of Microbiology & Immunology, United States; Center for Translational Research in Infection and Inflammation, School of Medicine, Tulane University, New Orleans, LA, United States
| | - Jay K Kolls
- Center for Translational Research in Infection and Inflammation, School of Medicine, Tulane University, New Orleans, LA, United States.
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6
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Ultrastructural Characterization of Human Bronchial Epithelial Cells during SARS-CoV-2 Infection: Morphological Comparison of Wild-Type and CFTR-Modified Cells. Int J Mol Sci 2022; 23:ijms23179724. [PMID: 36077122 PMCID: PMC9455986 DOI: 10.3390/ijms23179724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2022] [Revised: 08/20/2022] [Accepted: 08/24/2022] [Indexed: 11/17/2022] Open
Abstract
SARS-CoV-2 replicates in host cell cytoplasm. People with cystic fibrosis, considered at risk of developing severe symptoms of COVID-19, instead, tend to show mild symptoms. We, thus, analyzed at the ultrastructural level the morphological effects of SARS-CoV-2 infection on wild-type (WT) and F508del (ΔF) CFTR-expressing CFBE41o- cells at early and late time points post infection. We also investigated ACE2 expression through immune-electron microscopy. At early times of infection, WT cells exhibited double-membrane vesicles, representing typical replicative structures, with granular and vesicular content, while at late time points, they contained vesicles with viral particles. ∆F cells exhibited double-membrane vesicles with an irregular shape and degenerative changes and at late time of infection, showed vesicles containing viruses lacking a regular structure and a well-organized distribution. ACE2 was expressed at the plasma membrane and present in the cytoplasm only at early times in WT, while it persisted even at late times of infection in ΔF cells. The autophagosome content also differed between the cells: in WT cells, it comprised vesicles associated with virus-containing structures, while in ΔF cells, it comprised ingested material for lysosomal digestion. Our data suggest that CFTR-modified cells infected with SARS-CoV-2 have impaired organization of normo-conformed replicative structures.
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Evaluation of aminopyrrolidine amide to improve chloride transport in CFTR-defective cells. Bioorg Med Chem Lett 2022; 72:128866. [PMID: 35752380 DOI: 10.1016/j.bmcl.2022.128866] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 06/14/2022] [Accepted: 06/20/2022] [Indexed: 11/22/2022]
Abstract
The aminopyrrolidine amide PF-429242 is a specific inhibitor of the Site-1 Protease which is responsible for the cleavage, and thus the activation of the Activating Transcription Factor6 that down regulates many genes, during the Unfolded Protein Response. We hypothesized that PF-429242 could be used to prevent the ATF6-dependent down regulation of some genes. We chose the CFTR gene encoding the CFTR chloride channel as a model because it is down-regulated by ATF6 in Cystic Fibrosis. We evaluated the action of PF-429242 in human bronchial cells expressing the most frequent mutation of CFTR (p.Phe508del) found in patients. We observed that PF-429242 increases the synthesis of the mRNA and the protein encoded by the CFTR gene harbouring the mutation. We also observed that PF-429242 alleviates the defects of the p.Phe508del-CFTR channel in human Cystic Fibrosis cells. Our results suggest that aminopyrrolidine amide is a potential therapeutic target for Cystic Fibrosis that could also have beneficial effects in other diseases involving CFTR, such as the Chronic Obstructive Pulmonary Disease.
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8
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Hoch L, Bourg N, Degrugillier F, Bruge C, Benabides M, Pellier E, Tournois J, Mahé G, Maignan N, Dawe J, Georges M, Papazian D, Subramanian N, Simon S, Fanen P, Delevoye C, Richard I, Nissan X. Dual Blockade of Misfolded Alpha-Sarcoglycan Degradation by Bortezomib and Givinostat Combination. Front Pharmacol 2022; 13:856804. [PMID: 35571097 PMCID: PMC9093689 DOI: 10.3389/fphar.2022.856804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Accepted: 04/04/2022] [Indexed: 11/13/2022] Open
Abstract
Limb-girdle muscular dystrophy type R3 (LGMD R3) is a rare genetic disorder characterized by a progressive proximal muscle weakness and caused by mutations in the SGCA gene encoding alpha-sarcoglycan (α-SG). Here, we report the results of a mechanistic screening ascertaining the molecular mechanisms involved in the degradation of the most prevalent misfolded R77C-α-SG protein. We performed a combinatorial study to identify drugs potentializing the effect of a low dose of the proteasome inhibitor bortezomib on the R77C-α-SG degradation inhibition. Analysis of the screening associated to artificial intelligence-based predictive ADMET characterization of the hits led to identification of the HDAC inhibitor givinostat as potential therapeutical candidate. Functional characterization revealed that givinostat effect was related to autophagic pathway inhibition, unveiling new theories concerning degradation pathways of misfolded SG proteins. Beyond the identification of a new therapeutic option for LGMD R3 patients, our results shed light on the potential repurposing of givinostat for the treatment of other genetic diseases sharing similar protein degradation defects such as LGMD R5 and cystic fibrosis.
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Affiliation(s)
- Lucile Hoch
- CECS, I-Stem, Corbeil-Essonne, France.,INSERM U861, I-Stem, Corbeil-Essonne, France.,UEVE U861, I-Stem, Corbeil-Essonne, France
| | - Nathalie Bourg
- INTEGRARE, Genethon, Inserm, Univ Evry, Université Paris-Saclay, Evry, France
| | | | - Céline Bruge
- CECS, I-Stem, Corbeil-Essonne, France.,INSERM U861, I-Stem, Corbeil-Essonne, France.,UEVE U861, I-Stem, Corbeil-Essonne, France
| | - Manon Benabides
- CECS, I-Stem, Corbeil-Essonne, France.,INSERM U861, I-Stem, Corbeil-Essonne, France.,UEVE U861, I-Stem, Corbeil-Essonne, France
| | - Emilie Pellier
- CECS, I-Stem, Corbeil-Essonne, France.,INSERM U861, I-Stem, Corbeil-Essonne, France.,UEVE U861, I-Stem, Corbeil-Essonne, France
| | - Johana Tournois
- CECS, I-Stem, Corbeil-Essonne, France.,INSERM U861, I-Stem, Corbeil-Essonne, France.,UEVE U861, I-Stem, Corbeil-Essonne, France
| | - Gurvan Mahé
- CECS, I-Stem, Corbeil-Essonne, France.,INSERM U861, I-Stem, Corbeil-Essonne, France.,UEVE U861, I-Stem, Corbeil-Essonne, France
| | | | | | | | | | | | | | - Pascale Fanen
- Université Paris Est Creteil, INSERM, IMRB, Créteil, France.,Département de Genetique, DMU Biologie-Pathologie, GH Mondor-A. Chenevier, AP-HP, Creteil, France
| | - Cédric Delevoye
- Institut Curie, PSL Research University, CNRS, UMR144, Structure and Membrane Compartments, Paris, France.,Institut Curie, PSL Research University, CNRS, UMR144, Cell and Tissue Imaging Facility (PICT-IBiSA), Paris, France
| | - Isabelle Richard
- INTEGRARE, Genethon, Inserm, Univ Evry, Université Paris-Saclay, Evry, France
| | - Xavier Nissan
- CECS, I-Stem, Corbeil-Essonne, France.,INSERM U861, I-Stem, Corbeil-Essonne, France.,UEVE U861, I-Stem, Corbeil-Essonne, France
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9
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Lotti V, Merigo F, Lagni A, Di Clemente A, Ligozzi M, Bernardi P, Rossini G, Concia E, Plebani R, Romano M, Sbarbati A, Sorio C, Gibellini D. CFTR Modulation Reduces SARS-CoV-2 Infection in Human Bronchial Epithelial Cells. Cells 2022; 11:cells11081347. [PMID: 35456026 PMCID: PMC9028056 DOI: 10.3390/cells11081347] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 04/07/2022] [Accepted: 04/13/2022] [Indexed: 02/08/2023] Open
Abstract
People with cystic fibrosis should be considered at increased risk of developing severe symptoms of COVID-19. Strikingly, a broad array of evidence shows reduced spread of SARS-CoV-2 in these subjects, suggesting a potential role for CFTR in the regulation of SARS-CoV-2 infection/replication. Here, we analyzed SARS-CoV-2 replication in wild-type and CFTR-modified human bronchial epithelial cell lines and primary cells to investigate SARS-CoV-2 infection in people with cystic fibrosis. Both immortalized and primary human bronchial epithelial cells expressing wt or F508del-CFTR along with CRISPR/Cas9 CFTR-ablated clones were infected with SARS-CoV-2 and samples were harvested before and from 24 to 72 h post-infection. CFTR function was also inhibited in wt-CFTR cells with the CFTR-specific inhibitor IOWH-032 and partially restored in F508del-CFTR cells with a combination of CFTR modulators (VX-661+VX-445). Viral load was evaluated by real-time RT-PCR in both supernatant and cell extracts, and ACE-2 expression was analyzed by both western blotting and flow cytometry. SARS-CoV-2 replication was reduced in CFTR-modified bronchial cells compared with wild-type cell lines. No major difference in ACE-2 expression was detected before infection between wild-type and CFTR-modified cells, while a higher expression in wild-type compared to CFTR-modified cells was detectable at 72 h post-infection. Furthermore, inhibition of CFTR channel function elicited significant inhibition of viral replication in cells with wt-CFTR, and correction of CFTR function in F508del-CFTR cells increased the release of SARS-CoV-2 viral particles. Our study provides evidence that CFTR expression/function is involved in the regulation of SARS-CoV-2 replication, thus providing novel insights into the role of CFTR in SARS-CoV-2 infection and the development of therapeutic strategies for COVID-19.
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Affiliation(s)
- Virginia Lotti
- Microbiology Section, Department of Diagnostic and Public Health, University of Verona, 37134 Verona, Italy; (A.L.); (A.D.C.); (M.L.); (D.G.)
- Correspondence:
| | - Flavia Merigo
- Anatomy and Histology Section, Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, 37134 Verona, Italy; (F.M.); (P.B.); (A.S.)
| | - Anna Lagni
- Microbiology Section, Department of Diagnostic and Public Health, University of Verona, 37134 Verona, Italy; (A.L.); (A.D.C.); (M.L.); (D.G.)
| | - Andrea Di Clemente
- Microbiology Section, Department of Diagnostic and Public Health, University of Verona, 37134 Verona, Italy; (A.L.); (A.D.C.); (M.L.); (D.G.)
| | - Marco Ligozzi
- Microbiology Section, Department of Diagnostic and Public Health, University of Verona, 37134 Verona, Italy; (A.L.); (A.D.C.); (M.L.); (D.G.)
| | - Paolo Bernardi
- Anatomy and Histology Section, Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, 37134 Verona, Italy; (F.M.); (P.B.); (A.S.)
| | - Giada Rossini
- Microbiology Unit, IRCCS Azienda Ospedaliero-Universitaria di Bologna, 40138 Bologna, Italy;
| | - Ercole Concia
- Department of Diagnostic and Public Health, University of Verona, 37134 Verona, Italy;
| | - Roberto Plebani
- Laboratory of Molecular Medicine, Centre on Advanced Studies and Technology (CAST), Department of Medical, Oral and Biotechnological Sciences, “G. d’Annunzio” University of Chieti-Pescara, 66100 Chieti, Italy; (R.P.); (M.R.)
| | - Mario Romano
- Laboratory of Molecular Medicine, Centre on Advanced Studies and Technology (CAST), Department of Medical, Oral and Biotechnological Sciences, “G. d’Annunzio” University of Chieti-Pescara, 66100 Chieti, Italy; (R.P.); (M.R.)
| | - Andrea Sbarbati
- Anatomy and Histology Section, Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, 37134 Verona, Italy; (F.M.); (P.B.); (A.S.)
| | - Claudio Sorio
- General Pathology Section, Department of Medicine, University of Verona, 37134 Verona, Italy;
| | - Davide Gibellini
- Microbiology Section, Department of Diagnostic and Public Health, University of Verona, 37134 Verona, Italy; (A.L.); (A.D.C.); (M.L.); (D.G.)
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10
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Suzuki S, Chosa K, Barillà C, Yao M, Zuffardi O, Kai H, Shuto T, Suico MA, Kan YW, Sargent RG, Gruenert DC. Seamless Gene Correction in the Human Cystic Fibrosis Transmembrane Conductance Regulator Locus by Vector Replacement and Vector Insertion Events. Front Genome Ed 2022; 4:843885. [PMID: 35465025 PMCID: PMC9019469 DOI: 10.3389/fgeed.2022.843885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Accepted: 03/07/2022] [Indexed: 11/30/2022] Open
Abstract
Background: Gene correction via homology directed repair (HDR) in patient-derived induced pluripotent stem (iPS) cells for regenerative medicine are becoming a more realistic approach to develop personalized and mutation-specific therapeutic strategies due to current developments in gene editing and iPSC technology. Cystic fibrosis (CF) is the most common inherited disease in the Caucasian population, caused by mutations in the CF transmembrane conductance regulator (CFTR) gene. Since CF causes significant multi-organ damage and with over 2,000 reported CFTR mutations, CF patients could be one prominent population benefiting from gene and cell therapies. When considering gene-editing techniques for clinical applications, seamless gene corrections of the responsible mutations, restoring native "wildtype" DNA sequence without remnants of drug selectable markers or unwanted DNA sequence changes, would be the most desirable approach. Result: The studies reported here describe the seamless correction of the W1282X CFTR mutation using CRISPR/Cas9 nickases (Cas9n) in iPS cells derived from a CF patient homozygous for the W1282X Class I CFTR mutation. In addition to the expected HDR vector replacement product, we discovered another class of HDR products resulting from vector insertion events that created partial duplications of the CFTR exon 23 region. These vector insertion events were removed via intrachromosomal homologous recombination (IHR) enhanced by double nicking with CRISPR/Cas9n which resulted in the seamless correction of CFTR exon 23 in CF-iPS cells. Conclusion: We show here the removal of the drug resistance cassette and generation of seamless gene corrected cell lines by two independent processes: by treatment with the PiggyBac (PB) transposase in vector replacements or by IHR between the tandemly duplicated CFTR gene sequences.
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Affiliation(s)
- Shingo Suzuki
- Department of Otolaryngology–Head and Neck Surgery, University of California, San Francisco, San Francisco, CA, United States
- Department of Medicine, University of California, San Francisco, San Francisco, CA, United States
- Center for Stem Cell and Regenerative Medicine, Brown Foundation Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, TX, United States
| | - Keisuke Chosa
- Department of Otolaryngology–Head and Neck Surgery, University of California, San Francisco, San Francisco, CA, United States
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Cristina Barillà
- Department of Otolaryngology–Head and Neck Surgery, University of California, San Francisco, San Francisco, CA, United States
- Center for Stem Cell and Regenerative Medicine, Brown Foundation Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, TX, United States
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Michael Yao
- Department of Otolaryngology–Head and Neck Surgery, University of California, San Francisco, San Francisco, CA, United States
| | - Orsetta Zuffardi
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
| | - Hirofumi Kai
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Tsuyoshi Shuto
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Mary Ann Suico
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Yuet W. Kan
- Department of Medicine, University of California, San Francisco, San Francisco, CA, United States
- Institutes for Human Genetics, University of California, San Francisco, San Francisco, CA, United States
- Department of Laboratory Medicine, University of California, San Francisco, San Francisco, CA, United States
| | - R. Geoffrey Sargent
- Department of Otolaryngology–Head and Neck Surgery, University of California, San Francisco, San Francisco, CA, United States
- GeneTether Inc., San Lorenzo, CA, United States
| | - Dieter C. Gruenert
- Department of Otolaryngology–Head and Neck Surgery, University of California, San Francisco, San Francisco, CA, United States
- Institutes for Human Genetics, University of California, San Francisco, San Francisco, CA, United States
- Department of Pediatrics, University of Vermont College of Medicine, Burlington, VT, United States
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11
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Loureiro CA, Pinto FR, Barros P, Matos P, Jordan P. A SYK/SHC1 pathway regulates the amount of CFTR in the plasma membrane. Cell Mol Life Sci 2020; 77:4997-5015. [PMID: 31974654 PMCID: PMC11105000 DOI: 10.1007/s00018-020-03448-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Revised: 12/06/2019] [Accepted: 01/02/2020] [Indexed: 11/24/2022]
Abstract
Mutations in the cystic fibrosis transmembrane conductance regulator (CFTR) gene cause the recessive genetic disease cystic fibrosis, where the chloride transport across the apical membrane of epithelial cells mediated by the CFTR protein is impaired. CFTR protein trafficking to the plasma membrane (PM) is the result of a complex interplay between the secretory and membrane recycling pathways that control the number of channels present at the membrane. In addition, the ion transport activity of CFTR at the PM is modulated through post-translational protein modifications. Previously we described that spleen tyrosine kinase (SYK) phosphorylates a specific tyrosine residue in the nucleotide-binding domain 1 domain and this modification can regulate the PM abundance of CFTR. Here we identified the underlying biochemical mechanism using peptide pull-down assays followed by mass spectrometry. We identified in bronchial epithelial cells that the adaptor protein SHC1 recognizes tyrosine-phosphorylated CFTR through its phosphotyrosine-binding domain and that the formation of a complex between SHC1 and CFTR is induced at the PM in the presence of activated SYK. The depletion of endogenous SHC1 expression was sufficient to promote an increase in CFTR at the PM of these cells. The results identify a SYK/SHC1 pathway that regulates the PM levels of CFTR channels, contributing to a better understanding of how CFTR-mediated chloride secretion is regulated.
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Affiliation(s)
- Cláudia Almeida Loureiro
- Department of Human Genetics, National Health Institute 'Dr. Ricardo Jorge', Avenida Padre Cruz, 1649-016, Lisbon, Portugal
- BioISI-Biosystems and Integrative Sciences Institute, Faculty of Sciences, University of Lisbon, Lisbon, Portugal
| | - Francisco R Pinto
- BioISI-Biosystems and Integrative Sciences Institute, Faculty of Sciences, University of Lisbon, Lisbon, Portugal
- Department of Chemistry and Biochemistry, Faculty of Sciences, University of Lisbon, Lisbon, Portugal
| | - Patrícia Barros
- Department of Human Genetics, National Health Institute 'Dr. Ricardo Jorge', Avenida Padre Cruz, 1649-016, Lisbon, Portugal
- BioISI-Biosystems and Integrative Sciences Institute, Faculty of Sciences, University of Lisbon, Lisbon, Portugal
| | - Paulo Matos
- Department of Human Genetics, National Health Institute 'Dr. Ricardo Jorge', Avenida Padre Cruz, 1649-016, Lisbon, Portugal
- BioISI-Biosystems and Integrative Sciences Institute, Faculty of Sciences, University of Lisbon, Lisbon, Portugal
- Department of Chemistry and Biochemistry, Faculty of Sciences, University of Lisbon, Lisbon, Portugal
| | - Peter Jordan
- Department of Human Genetics, National Health Institute 'Dr. Ricardo Jorge', Avenida Padre Cruz, 1649-016, Lisbon, Portugal.
- BioISI-Biosystems and Integrative Sciences Institute, Faculty of Sciences, University of Lisbon, Lisbon, Portugal.
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12
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Dhooghe B, Bouzin C, Mottais A, Hermans E, Delion M, Panin N, Noel S, Leal T. Vardenafil increases intracellular accumulation of the most prevalent mutant cystic fibrosis transmembrane conductance regulator (CTFR) in human bronchial epithelial cells. Biol Open 2020; 9:bio053116. [PMID: 32747447 PMCID: PMC7473651 DOI: 10.1242/bio.053116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2020] [Accepted: 07/22/2020] [Indexed: 11/20/2022] Open
Abstract
Cystic fibrosis (CF) is a genetic disease characterized by progressive lung and chronic digestive manifestations. We have shown that therapeutic doses of vardenafil, a phosphodiesterase type 5 (PDE5) inhibitor, corrects CF Transmembrane conductance Regulator (CFTR)-dependent chloride transport in respiratory and intestinal tissues of F508del homozygous mice. Here, we studied the effect of vardenafil on CFTR in 16HBE14o- and CFBE41o- cell lines. First, the expression levels of PDE5 mRNA in these cell lines were monitored. The two cell lines were exposed to different drugs (dimethyl sulfoxide, 8-Br-cGMP, forskolin or vardenafil). The cAMP and cGMP intracellular concentrations were measured. Finally, we localised the CFTR by immunolabelling. PDE5 was similarly expressed in both wild-type and in CF cells. A fast and transient rise in cGMP intracellular contents followed treatment with vardenafil, confirming its PDE5 inhibitory effect. We showed that vardenafil promoted both the early steps of the cellular processing and the trafficking of F508del without fully addressing the protein to the plasma membrane. The effect was not reproduced by the brominated cGMP analogue and it was not prevented by the combination of a protein kinase G (PKG) inhibitor and vardenafil. These findings support the view that vardenafil partially rescues F508del through cGMP/PKG-independent mechanisms.
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Affiliation(s)
- Barbara Dhooghe
- Louvain Centre for Toxicology and Applied Pharmacology, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, 1200, Brussels, Belgium
| | - Caroline Bouzin
- Institut de Recherche Expérimentale et Clinique, Cell Imaging Platform, Université Catholique de Louvain, 1200, Brussels, Belgium
| | - Angélique Mottais
- Louvain Centre for Toxicology and Applied Pharmacology, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, 1200, Brussels, Belgium
| | - Emmanuel Hermans
- Institute of Neurosciences, Faculté de Pharmacie et Sciences Biomédicales, Université Catholique de Louvain, 1200, Brussels, Belgium
| | - Martial Delion
- Louvain Centre for Toxicology and Applied Pharmacology, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, 1200, Brussels, Belgium
| | - Nadtha Panin
- Louvain Centre for Toxicology and Applied Pharmacology, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, 1200, Brussels, Belgium
| | - Sabrina Noel
- Louvain Centre for Toxicology and Applied Pharmacology, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, 1200, Brussels, Belgium
| | - Teresinha Leal
- Louvain Centre for Toxicology and Applied Pharmacology, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, 1200, Brussels, Belgium
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13
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Degrugillier F, Aissat A, Prulière-Escabasse V, Bizard L, Simonneau B, Decrouy X, Jiang C, Rotin D, Fanen P, Simon S. Phosphorylation of the Chaperone-Like HspB5 Rescues Trafficking and Function of F508del-CFTR. Int J Mol Sci 2020; 21:ijms21144844. [PMID: 32650630 PMCID: PMC7402320 DOI: 10.3390/ijms21144844] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 07/02/2020] [Accepted: 07/04/2020] [Indexed: 02/07/2023] Open
Abstract
Cystic Fibrosis is a lethal monogenic autosomal recessive disease linked to mutations in Cystic Fibrosis Transmembrane Conductance Regulator (CFTR) protein. The most frequent mutation is the deletion of phenylalanine at position 508 of the protein. This F508del-CFTR mutation leads to misfolded protein that is detected by the quality control machinery within the endoplasmic reticulum and targeted for destruction by the proteasome. Modulating quality control proteins as molecular chaperones is a promising strategy for attenuating the degradation and stabilizing the mutant CFTR at the plasma membrane. Among the molecular chaperones, the small heat shock protein HspB1 and HspB4 were shown to promote degradation of F508del-CFTR. Here, we investigated the impact of HspB5 expression and phosphorylation on transport to the plasma membrane, function and stability of F508del-CFTR. We show that a phosphomimetic form of HspB5 increases the transport to the plasma membrane, function and stability of F508del-CFTR. These activities are further enhanced in presence of therapeutic drugs currently used for the treatment of cystic fibrosis (VX-770/Ivacaftor, VX-770+VX-809/Orkambi). Overall, this study highlights the beneficial effects of a phosphorylated form of HspB5 on F508del-CFTR rescue and its therapeutic potential in cystic fibrosis.
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Affiliation(s)
- Fanny Degrugillier
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
| | - Abdel Aissat
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
- AP-HP, Hôpital Henri Mondor, Département de Génétique, F-94010 Creteil, France
| | - Virginie Prulière-Escabasse
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
- Centre Hospitalier Intercommunal de Creteil, Service d’ORL et de Chirurgie Cervico-Faciale, F-94010 Creteil, France
| | - Lucie Bizard
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
| | - Benjamin Simonneau
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
| | - Xavier Decrouy
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
| | - Chong Jiang
- The Hospital for Sick Children and the University of Toronto, Toronto, ON M5G 0A4, Canada; (C.J.); (D.R.)
| | - Daniela Rotin
- The Hospital for Sick Children and the University of Toronto, Toronto, ON M5G 0A4, Canada; (C.J.); (D.R.)
| | - Pascale Fanen
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
- AP-HP, Hôpital Henri Mondor, Département de Génétique, F-94010 Creteil, France
| | - Stéphanie Simon
- Univ Paris Est Creteil, INSERM, IMRB, F-94010 Creteil, France; (F.D.); (A.A.); (V.P.-E.); (L.B.); (B.S.); (X.D.); (P.F.)
- Correspondence: ; Tel.: +33-1-49-81-68-55
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14
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Leiter H, Toepfer S, Messner P, Rabensteiner M, Gostner JM, Lackner M, Hermann M, Nagl M. Microbicidal activity of N-chlorotaurine can be enhanced in the presence of lung epithelial cells. J Cyst Fibros 2020; 19:1011-1017. [PMID: 32201161 DOI: 10.1016/j.jcf.2020.03.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 03/07/2020] [Accepted: 03/07/2020] [Indexed: 01/24/2023]
Abstract
BACKGROUND N-chlorotaurine (NCT) is an endogenous active chlorine compound that can be used as an antiseptic and anti-infective in different body regions. Recently, tolerability of inhaled NCT has been demonstrated in humans so that it is of interest for future treatment of cystic fibrosis. In the present study, we tested the bactericidal and fungicidal activity of NCT in different lung cell culture models. METHODS Bacteria (Staphylococcus aureus, Pseudomonas aeruginosa) and fungi (Candida albicans, Exophiala dermatitidis) were co-incubated with lung epithelial cell cultures, and after 4 h NCT was added. After different incubation times, aliquots were removed and quantitative cultures were performed. RESULTS NCT at the therapeutically applied concentration of 1% (55 mM) completely killed the test pathogens within 15 - 30 min at 20 °C and at 37 °C. Killing by 0.3% NCT lasted up to 4 h dependent on the pathogen at 20 °C and up to 1 h at 37 °C. 0.1% NCT was the threshold concentration for killing since this amount of oxidation capacity was consumed by reactions with the organic compounds of the medium within 3 h (20 °C) and 0.5 h (37 °C). CONCLUSIONS NCT in therapeutic concentration demonstrated its microbicidal activity in the presence of lung epithelial cells. Remarkably, particularly the fungicidal activity was higher under these conditions than in phosphate buffer. This can be explained by formation of the stronger microbicidal monochloramine in equilibrium by transchlorination. The results suggest the suitability of NCT as inhalation medication in the lung.
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Affiliation(s)
- Hannes Leiter
- Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, Schöpfstr. 41, A-6020 Innsbruck, Austria
| | - Stephanie Toepfer
- Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, Schöpfstr. 41, A-6020 Innsbruck, Austria; Division of Medical Biochemistry, Medical University of Innsbruck, Austria
| | - Petra Messner
- Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, Schöpfstr. 41, A-6020 Innsbruck, Austria
| | - Marion Rabensteiner
- Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, Schöpfstr. 41, A-6020 Innsbruck, Austria
| | - Johanna M Gostner
- Division of Medical Biochemistry, Medical University of Innsbruck, Austria
| | - Michaela Lackner
- Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, Schöpfstr. 41, A-6020 Innsbruck, Austria
| | - Martin Hermann
- Department of Anaesthesiology and Critical Care Medicine, Medical University of Innsbruck, Austria
| | - Markus Nagl
- Institute of Hygiene and Medical Microbiology, Medical University of Innsbruck, Schöpfstr. 41, A-6020 Innsbruck, Austria.
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15
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Bergbower EAS, Sabirzhanova I, Boinot C, Guggino WB, Cebotaru L. Restoration of F508-del Function by Transcomplementation: The Partners Meet in the Endoplasmic Reticulum. Cell Physiol Biochem 2019; 52:1267-1279. [PMID: 31026390 DOI: 10.33594/000000089] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Accepted: 04/23/2019] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND/AIMS Because of the small size of adeno-associated virus, AAV, the cystic fibrosis conductance regulator, CFTR, cDNA is too large to fit within AAV and must be truncated. We report here on two truncated versions of CFTR, which, when inserted into AAV1 and used to infect airway cells, rescue F508-del CFTR via transcomplementation. The purpose of this study is to shed light on where in the cell transcomplementation occurs and how it results in close association between the endogenous F508-del and truncated CFTR. METHODS We treated CF airway cells (CFBE41o-) with AAV2/1 (AAV2 inverted terminal repeats/AAV1 capsid) containing truncated forms of CFTR, ∆264 and ∆27-264 CFTR, who can restore the function of F508-del by transcomplementation. We addressed the aims of the study using a combination of confocal microscopy and short circuit currents measurements. For the latter, CF bronchial epithelial cells (CFBE) were grown on permeable supports. RESULTS We show that both F508del and the truncation mutants colocalize in the ER and that both the rescued F508-del and the transcomplementing mutants reach the plasma membrane together. There was significant fluorescence resonance energy transfer (FRET) between F508-del and the transcomplementing mutants within the endoplasmic reticulum (ER), suggesting that transcomplementation occurs through a bimolecular interaction. We found that transcomplementation could increase the Isc in CFBE41o- cells stably expressing additional wt-CFTR or F508-del and in parental CFBE41o- cells expressing endogenous levels of F508-del. CONCLUSION We conclude that the functional rescue of F508-del by transcomplementation occurs via a bimolecular interaction that most likely begins in the ER and continues at the plasma membrane. These results come at an opportune time for developing a gene therapy for CF and offer new treatment options for a wide range of CF patients.
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Affiliation(s)
| | - Inna Sabirzhanova
- Departments of Medicine and Physiology, Johns Hopkins University, Baltimore, USA
| | - Clément Boinot
- Departments of Medicine and Physiology, Johns Hopkins University, Baltimore, USA
| | - William B Guggino
- Departments of Medicine and Physiology, Johns Hopkins University, Baltimore, USA
| | - Liudmila Cebotaru
- Departments of Medicine and Physiology, Johns Hopkins University, Baltimore, USA,
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16
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Kamei S, Maruta K, Fujikawa H, Nohara H, Ueno-Shuto K, Tasaki Y, Nakashima R, Kawakami T, Eto Y, Suico MA, Suzuki S, Gruenert DC, Li JD, Kai H, Shuto T. Integrative expression analysis identifies a novel interplay between CFTR and linc-SUMF1-2 that involves CF-associated gene dysregulation. Biochem Biophys Res Commun 2018; 509:521-528. [PMID: 30598261 DOI: 10.1016/j.bbrc.2018.12.152] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Accepted: 12/21/2018] [Indexed: 12/19/2022]
Abstract
Cystic fibrosis transmembrane regulator (CFTR) is a cyclic AMP-dependent Cl- channel, and its dysfunction, due to CFTR gene mutations, causes the lethal inherited disorder cystic fibrosis (CF). To date, widespread dysregulation of certain coding genes in CF airway epithelial cells is well studied and considered as the driver of pulmonary abnormality. However, the involvement of non-coding genes, novel classes of functional RNAs with little or no protein-coding capacity, in the regulation of CF-associated gene dysregulation is poorly understood. Here, we utilized integrative analyses of human transcriptome array (HTA) and characterized 99 coding and 91 non-coding RNAs that are dysregulated in CFTR-defective CF bronchial epithelial cell line CFBE41o-. Among these genes, the expression level of linc-SUMF1-2, an intergenic non-coding RNA (lincRNA) whose function is unknown, was inversely correlated with that of WT-CFTR and consistently higher in primary human CF airway epithelial cells (DHBE-CF). Further integrative analyses under linc-SUMF1-knockdown condition determined MXRA5, SEMA5A, CXCL10, AK022877, CTGF, MYC, AREG and LAMB3 as both CFTR- and linc-SUMF1-2-dependent dysregulated gene sets in CF airway epithelial cells. Overall, our analyses reveal linc-SUMF1-2 as a dysregulated non-coding gene in CF as well as CFTR-linc-SUMF1-2 axis as a novel regulatory pathway involved in CF-associated gene dysregulation.
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Affiliation(s)
- Shunsuke Kamei
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan; Program for Leading Graduate Schools "HIGO (Health Life Science: Interdisciplinary and Glocal Oriented) Program", Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Kasumi Maruta
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Haruka Fujikawa
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan; Program for Leading Graduate Schools "HIGO (Health Life Science: Interdisciplinary and Glocal Oriented) Program", Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Hirofumi Nohara
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan; Program for Leading Graduate Schools "HIGO (Health Life Science: Interdisciplinary and Glocal Oriented) Program", Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Keiko Ueno-Shuto
- Laboratory of Pharmacology, Division of Life Science, Faculty of Pharmaceutical Sciences, Sojo University, 4-22-1 Ikeda, Nishi-ku, Kumamoto, 860-0082, Japan
| | - Yukihiro Tasaki
- Center for Inflammation, Immunity & Infection, Institute for Biomedical Sciences, Georgia State University, 714 Petit Science Center, 100 Piedmont Ave SE, Atlanta, GA30303, USA
| | - Ryunosuke Nakashima
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Taisei Kawakami
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Yuka Eto
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Mary Ann Suico
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Shingo Suzuki
- Institute of Molecular Medicine, University of Texas Health Science Center at Houston, 1825 Pressler St, Houston, TX77030, USA
| | - Dieter C Gruenert
- Head and Neck Stem Cell Lab, University of California, San Francisco, 2340 Sutter St, Box 1330, N331, San Francisco, CA, 94115, USA
| | - Jian-Dong Li
- Center for Inflammation, Immunity & Infection, Institute for Biomedical Sciences, Georgia State University, 714 Petit Science Center, 100 Piedmont Ave SE, Atlanta, GA30303, USA
| | - Hirofumi Kai
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan
| | - Tsuyoshi Shuto
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto, 862-0973, Japan.
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17
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Sabirzhanova I, Boinot C, Guggino WB, Cebotaru L. Syntaxin 8 and the Endoplasmic Reticulum Processing of ΔF508-CFTR. Cell Physiol Biochem 2018; 51:1489-1499. [PMID: 30485852 PMCID: PMC6482459 DOI: 10.1159/000495596] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Accepted: 11/20/2018] [Indexed: 01/22/2023] Open
Abstract
Background/Aims: Cystic fibrosis (CF) is a lethal recessive disorder caused by mutations in the CF transmembrane conductance regulator (CFTR). ΔF508, the most common mutation, is a misfolded protein that is retained in the endoplasmic reticulum and degraded, precluding delivery to the cell surface [1]. Methods: Here we use a combination of western blotting, immunoprecipitation, and short circuit current techniques combined with confocal microscopy to address whether the SNARE attachment protein, STX8 plays a role in ΔF508’s processing and movement out of the ER. Results: Although the SNARE protein STX8 is thought to be functionally related and primarily localized to early endosomes, we show that silencing of STX8, particularly in the presence of the Vertex corrector molecule C18, rescues ΔF508-CFTR, allowing it to reach the cell surface and increasing CFTR-dependent chloride currents by approximately 2.5-fold over control values. STX8 silencing reduced the binding of quality control protein, Hsp 27, a protein that targets ΔF508-CFTR for sumoylation and subsequent degradation, to ΔF508-CFTR. STX8 silencing increased the levels of Hsp 60 a protein involving in early events in protein folding. Conclusion: STX8 knockdown creates an environment favorable for mature ΔF508 to reach the cell surface. The data also suggest that when present at normal levels, STX8 functions as part of the cell’s quality control mechanism.
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18
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Robinson E, MacDonald KD, Slaughter K, McKinney M, Patel S, Sun C, Sahay G. Lipid Nanoparticle-Delivered Chemically Modified mRNA Restores Chloride Secretion in Cystic Fibrosis. Mol Ther 2018; 26:2034-2046. [PMID: 29910178 PMCID: PMC6094356 DOI: 10.1016/j.ymthe.2018.05.014] [Citation(s) in RCA: 166] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2018] [Revised: 05/12/2018] [Accepted: 05/12/2018] [Indexed: 12/14/2022] Open
Abstract
The promise of gene therapy for the treatment of cystic fibrosis has yet to be fully clinically realized despite years of effort toward correcting the underlying genetic defect in the cystic fibrosis transmembrane conductance regulator (CFTR). mRNA therapy via nanoparticle delivery represents a powerful technology for the transfer of genetic material to cells with large, widespread populations, such as airway epithelia. We deployed a clinically relevant lipid-based nanoparticle (LNP) for packaging and delivery of large chemically modified CFTR mRNA (cmCFTR) to patient-derived bronchial epithelial cells, resulting in an increase in membrane-localized CFTR and rescue of its primary function as a chloride channel. Furthermore, nasal application of LNP-cmCFTR restored CFTR-mediated chloride secretion to conductive airway epithelia in CFTR knockout mice for at least 14 days. On day 3 post-transfection, CFTR activity peaked, recovering up to 55% of the net chloride efflux characteristic of healthy mice. This magnitude of response is superior to liposomal CFTR DNA delivery and is comparable with outcomes observed in the currently approved drug ivacaftor. LNP-cmRNA-based systems represent a powerful platform technology for correction of cystic fibrosis and other monogenic disorders.
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Affiliation(s)
- Ema Robinson
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University, Portland, OR 97201, USA
| | - Kelvin D MacDonald
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University, Portland, OR 97201, USA; Department of Pediatrics, School of Medicine, Oregon Health and Science University, Portland, OR 97239, USA
| | - Kai Slaughter
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University, Portland, OR 97201, USA
| | - Madison McKinney
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University, Portland, OR 97201, USA
| | - Siddharth Patel
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University, Portland, OR 97201, USA
| | - Conroy Sun
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University, Portland, OR 97201, USA; Department of Radiation Medicine, School of Medicine, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA
| | - Gaurav Sahay
- Department of Pharmaceutical Sciences, College of Pharmacy, Oregon State University, Portland, OR 97201, USA; Department of Biomedical Engineering, Oregon Health and Science University, Portland, OR 97201, USA.
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19
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Liu Q, Sabirzhanova I, Yanda MK, Bergbower EAS, Boinot C, Guggino WB, Cebotaru L. Rescue of CFTR NBD2 mutants N1303K and S1235R is influenced by the functioning of the autophagosome. J Cyst Fibros 2018; 17:582-594. [PMID: 29936070 DOI: 10.1016/j.jcf.2018.05.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 05/27/2018] [Accepted: 05/27/2018] [Indexed: 11/19/2022]
Abstract
The missing phenylalanine at position 508, located in nucleotide-binding domain (NBD1) of the cystic fibrosis transmembrane regulator (CFTR), is the most common cystic fibrosis mutation. Severe disease-causing mutations also occur in NBD2. To provide information on potential therapeutic strategies for mutations in NBD2, we used a combination of biochemical, cell biological and electrophysiological approaches and newly created cell lines to study two disease-causing NBD2 mutants, N1303K and S1235R. We observed that neither was sensitive to E64, a cysteine protease inhibitor. However, further investigation showed that when treated with a combination of correctors, C4 + C18, both mutants also responded to E64. Further exploration to assess aggresome throughput using the autophagy regulator LC3 as a marker showed that, in the absence of correctors, N1303K showed a stalled throughput of LC3-II to the aggresome. The throughput became active again after treatment with the corrector combination C4 + C18. Confocal microscopic studies showed that the N1303K and S1235R mutant proteins both co-localized with LC3, but this co-localization was abolished by the corrector combination and, to a lesser extent, by VX-809. Both the corrector combination and VX-809 increased the CFTR chloride channel function of both mutants. We conclude that correctors have a dual effect, particularly on N1303K: they improve trafficking and function at the plasma membrane and reduce the association with autophagosomes. After treatment with correctors persistent degradation by the autophagosome may limit restoration of function. Thus, mutations in NBD2 of CFTR, in contrast to ΔF508-CFTR, may require additional personalized strategies to rescue them.
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Affiliation(s)
- Qiangni Liu
- Department of Medicine, Johns Hopkins University, Baltimore, MD, USA; Department of Physiology, Johns Hopkins University, Baltimore, MD, USA
| | - Inna Sabirzhanova
- Department of Medicine, Johns Hopkins University, Baltimore, MD, USA; Department of Physiology, Johns Hopkins University, Baltimore, MD, USA
| | - Murali K Yanda
- Department of Medicine, Johns Hopkins University, Baltimore, MD, USA; Department of Physiology, Johns Hopkins University, Baltimore, MD, USA
| | - Emily A S Bergbower
- Department of Medicine, Johns Hopkins University, Baltimore, MD, USA; Department of Physiology, Johns Hopkins University, Baltimore, MD, USA
| | - Clément Boinot
- Department of Medicine, Johns Hopkins University, Baltimore, MD, USA; Department of Physiology, Johns Hopkins University, Baltimore, MD, USA
| | - William B Guggino
- Department of Physiology, Johns Hopkins University, Baltimore, MD, USA
| | - Liudmila Cebotaru
- Department of Medicine, Johns Hopkins University, Baltimore, MD, USA.
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20
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Sellers ZM, Illek B, Figueira MF, Hari G, Joo NS, Sibley E, Souza-Menezes J, Morales MM, Fischer H, Wine JJ. Impaired PGE2-stimulated Cl- and HCO3- secretion contributes to cystic fibrosis airway disease. PLoS One 2017; 12:e0189894. [PMID: 29281691 PMCID: PMC5744969 DOI: 10.1371/journal.pone.0189894] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2017] [Accepted: 12/04/2017] [Indexed: 12/15/2022] Open
Abstract
Background Airway mucociliary clearance (MCC) is an important defense mechanism against pulmonary infections and is compromised in cystic fibrosis (CF). Cl- and HCO3- epithelial transport are integral to MCC. During pulmonary infections prostaglandin E2 (PGE2) production is abundant. Aim To determine the effect of PGE2 on airway Cl- and HCO3- secretion and MCC in normal and CF airways. Methods We examined PGE2 stimulated MCC, Cl- and HCO3- secretion using ferret trachea, human bronchial epithelial cell cultures (CFBE41o- with wildtype CFTR (CFBE41 WT) or homozygous F508del CFTR (CFBE41 CF) and human normal bronchial submucosal gland cell line (Calu-3) in Ussing chambers with or without pH-stat. Results PGE2 stimulated MCC in a dose-dependent manner and was partially impaired by CFTRinh-172. PGE2-stimulated Cl- current in ferret trachea was partially inhibited by CFTRinh-172, with niflumic acid eliminating the residual current. CFBE41 WT cell monolayers produced a robust Cl- and HCO3- secretory response to PGE2, both of which were completely inhibited by CFTRinh-172. CFBE41 CF cells exhibited no response to PGE2. In Calu-3 cells, PGE2 stimulated Cl- and HCO3- secretion. Cl- secretion was partially inhibited by CFTRinh-172, with additional inhibition by niflumic acid. HCO3- secretion was completely inhibited by CFTRinh-172. Conclusions PGE2 stimulates bronchotracheal MCC and this response is decreased in CF. In CF airway, PGE2-stimulated Cl- and HCO3- conductance is impaired and may contribute to decreased MCC. There remains a CFTR-independent Cl- current in submucosal glands, which if exploited, could represent a means of improving airway Cl- secretion and MCC in CF.
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Affiliation(s)
- Zachary M. Sellers
- Division of Pediatric Gastroenterology, Hepatolfifogy, and Nutrition, Stanford University, Palo Alto, CA, United States of America
- Cystic Fibrosis Research Laboratory, Stanford University, Palo Alto, CA, United States of America
- * E-mail:
| | - Beate Illek
- Children’s Hospital Oakland Research Institute, Oakland, CA, United States of America
| | - Miriam Frankenthal Figueira
- Carlos Chagas Filho Biophysics Institute, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
- Core for Ecology and Socio Environmental Development, Federal University of Rio de Janeiro, Macaé, RJ, Brazil
| | - Gopika Hari
- Children’s Hospital Oakland Research Institute, Oakland, CA, United States of America
| | - Nam Soo Joo
- Cystic Fibrosis Research Laboratory, Stanford University, Palo Alto, CA, United States of America
| | - Eric Sibley
- Division of Pediatric Gastroenterology, Hepatolfifogy, and Nutrition, Stanford University, Palo Alto, CA, United States of America
| | - Jackson Souza-Menezes
- Carlos Chagas Filho Biophysics Institute, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
- Core for Ecology and Socio Environmental Development, Federal University of Rio de Janeiro, Macaé, RJ, Brazil
| | - Marcelo M. Morales
- Carlos Chagas Filho Biophysics Institute, Federal University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
| | - Horst Fischer
- Children’s Hospital Oakland Research Institute, Oakland, CA, United States of America
| | - Jeffrey J. Wine
- Cystic Fibrosis Research Laboratory, Stanford University, Palo Alto, CA, United States of America
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21
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Kamei S, Fujikawa H, Nohara H, Ueno-Shuto K, Maruta K, Nakashima R, Kawakami T, Matsumoto C, Sakaguchi Y, Ono T, Suico MA, Boucher RC, Gruenert DC, Takeo T, Nakagata N, Li JD, Kai H, Shuto T. Zinc Deficiency via a Splice Switch in Zinc Importer ZIP2/SLC39A2 Causes Cystic Fibrosis-Associated MUC5AC Hypersecretion in Airway Epithelial Cells. EBioMedicine 2017; 27:304-316. [PMID: 29289532 PMCID: PMC5828551 DOI: 10.1016/j.ebiom.2017.12.025] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2017] [Revised: 12/15/2017] [Accepted: 12/19/2017] [Indexed: 01/02/2023] Open
Abstract
Airway mucus hyperproduction and fluid imbalance are important hallmarks of cystic fibrosis (CF), the most common life-shortening genetic disorder in Caucasians. Dysregulated expression and/or function of airway ion transporters, including cystic fibrosis transmembrane conductance regulator (CFTR) and epithelial sodium channel (ENaC), have been implicated as causes of CF-associated mucus hypersecretory phenotype. However, the contributory roles of other substances and transporters in the regulation of CF airway pathogenesis remain unelucidated. Here, we identified a novel connection between CFTR/ENaC expression and the intracellular Zn2 + concentration in the regulation of MUC5AC, a major secreted mucin that is highly expressed in CF airway. CFTR-defective and ENaC-hyperactive airway epithelial cells specifically and highly expressed a unique, alternative splice isoform of the zinc importer ZIP2/SLC39A2 (ΔC-ZIP2), which lacks the C-terminal domain. Importantly, ΔC-ZIP2 levels correlated inversely with wild-type ZIP2 and intracellular Zn2 + levels. Moreover, the splice switch to ΔC-ZIP2 as well as decreased expression of other ZIPs caused zinc deficiency, which is sufficient for induction of MUC5AC; while ΔC-ZIP2 expression per se induced ENaC expression and function. Thus, our findings demonstrate that the novel splicing switch contributes to CF lung pathology via the novel interplay of CFTR, ENaC, and ZIP2 transporters. Zinc deficiency is a common feature in both CFTR-defective (CF) and ENaC-hyperactive (CF-like) airway epithelial cells. A splice switch from WT-ZIP2 to ΔC-ZIP2 as well as other ZIPs down-regulation caused zinc deficiency in CF and CF-like cells. Lower intracellular Zn2 + levels contributed to CF-associated MUC5AC hypersecretion in airway epithelial cells.
The role of zinc in the pathogenesis of CF lung disease is not well understood. We utilized human CF patient-derived cell lines and primary cells as well as murine CF model, and identified zinc deficiency as a common characteristic in CF models. Down-regulation of several zinc importers (ZIPs) in CF cells caused zinc deficiency, which is sufficient for induction of MUC5AC, a major secreted mucin that exacerbates CF pathogenesis. Especially, strong contribution of ΔC-ZIP2, a novel ZIP2 splice isoform, in the regulation of CF-associated MUC5AC hypersecretion was clearly demonstrated. The study refined the importance of zinc in airway homeostasis.
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Affiliation(s)
- Shunsuke Kamei
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan; Program for Leading Graduate Schools "HIGO (Health life science: Interdisciplinary and Glocal Oriented) Program", Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Haruka Fujikawa
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan; Program for Leading Graduate Schools "HIGO (Health life science: Interdisciplinary and Glocal Oriented) Program", Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Hirofumi Nohara
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan; Program for Leading Graduate Schools "HIGO (Health life science: Interdisciplinary and Glocal Oriented) Program", Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Keiko Ueno-Shuto
- Laboratory of Pharmacology, Division of Life Science, Faculty of Pharmaceutical Sciences, Sojo University, 4-22-1 Ikeda, Nishi-ku, Kumamoto 860-0082, Japan
| | - Kasumi Maruta
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Ryunosuke Nakashima
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Taisei Kawakami
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Chizuru Matsumoto
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Yuki Sakaguchi
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Tomomi Ono
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Mary Ann Suico
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan
| | - Richard C Boucher
- Marsico Lung Institute, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Dieter C Gruenert
- Head and Neck Stem Cell Lab, University of California, San Francisco, 2340 Sutter St, Box 1330, N331, San Francisco, CA 94115, USA
| | - Toru Takeo
- Division of Reproductive Engineering, Center for Animal Resources and Development (CARD), Kumamoto University, 2-2-1 Honjo, Chuo-ku, Kumamoto 860-0811, Japan
| | - Naomi Nakagata
- Division of Reproductive Engineering, Center for Animal Resources and Development (CARD), Kumamoto University, 2-2-1 Honjo, Chuo-ku, Kumamoto 860-0811, Japan
| | - Jian-Dong Li
- Center for Inflammation, Immunity & Infection, Institute for Biomedical Sciences, Georgia State University, 714 Petit Science Center, 100 Piedmont Ave SE, Atlanta GA30303, USA
| | - Hirofumi Kai
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
| | - Tsuyoshi Shuto
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-Honmachi, Chuo-ku, Kumamoto 862-0973, Japan.
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22
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Calvez ML, Benz N, Huguet F, Saint-Pierre A, Rouillé E, Coraux C, Férec C, Kerbiriou M, Trouvé P. Buserelin alleviates chloride transport defect in human cystic fibrosis nasal epithelial cells. PLoS One 2017; 12:e0187774. [PMID: 29145426 PMCID: PMC5690610 DOI: 10.1371/journal.pone.0187774] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2017] [Accepted: 10/25/2017] [Indexed: 11/18/2022] Open
Abstract
Cystic fibrosis (CF) is the most common autosomal recessive disease in Caucasians caused by mutations in the gene encoding the Cystic Fibrosis Transmembrane conductance Regulator (CFTR) chloride (Cl-) channel regulated by protein kinases, phosphatases, divalent cations and by protein-protein interactions. Among protein-protein interactions, we previously showed that Annexin A5 (AnxA5) binds to CFTR and is involved in the channel localization within membranes and in its Cl- channel function. The deletion of phenylalanine at position 508 (F508del) is the most common mutation in CF which leads to an altered protein (F508del-CFTR) folding with a nascent protein retained within the ER and is quickly degraded. We previously showed that AnxA5 binds to F508del-CFTR and that its increased expression due to a Gonadoliberin (GnRH) augments Cl- efflux in cells expressing F508del-CFTR. The aim of the present work was to use the GnRH analog buserelin which is already used in medicine. Human nasal epithelial cells from controls and CF patients (F508del/F508del) were treated with buserelin and we show here that the treatment alleviates Cl- channel defects in CF cells. Using proteomics we highlighted some proteins explaining this result. Finally, we propose that buserelin is a potential new pharmaceutical compound that can be used in CF and that bronchus can be targeted since we show here that they express GnRH-R.
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Affiliation(s)
- Marie-Laure Calvez
- Inserm, UMR1078 "Génétique, Génomique Fonctionnelle et Biotechnologies", Univ Brest, EFS, IBSAM, Brest, France
- Université de Bretagne Occidentale, Faculté de Médecine et des sciences de la santé, Brest, France
- Association G Saleun, Brest, France
| | - Nathalie Benz
- Inserm, UMR1078 "Génétique, Génomique Fonctionnelle et Biotechnologies", Univ Brest, EFS, IBSAM, Brest, France
- Association G Saleun, Brest, France
| | - Florentin Huguet
- Inserm, UMR1078 "Génétique, Génomique Fonctionnelle et Biotechnologies", Univ Brest, EFS, IBSAM, Brest, France
- Université de Bretagne Occidentale, Faculté de Médecine et des sciences de la santé, Brest, France
- Association G Saleun, Brest, France
| | - Aude Saint-Pierre
- Inserm, UMR1078 "Génétique, Génomique Fonctionnelle et Biotechnologies", Univ Brest, EFS, IBSAM, Brest, France
- Université de Bretagne Occidentale, Faculté de Médecine et des sciences de la santé, Brest, France
| | - Elise Rouillé
- Inserm, UMR1078 "Génétique, Génomique Fonctionnelle et Biotechnologies", Univ Brest, EFS, IBSAM, Brest, France
- Université de Bretagne Occidentale, Faculté de Médecine et des sciences de la santé, Brest, France
| | | | - Claude Férec
- Inserm, UMR1078 "Génétique, Génomique Fonctionnelle et Biotechnologies", Univ Brest, EFS, IBSAM, Brest, France
- Université de Bretagne Occidentale, Faculté de Médecine et des sciences de la santé, Brest, France
- CHRU Brest, Hôpital Morvan, Laboratoire de Génétique Moléculaire, Brest, France
- Etablissement Français du Sang—Bretagne, Brest, France
| | - Mathieu Kerbiriou
- Inserm, UMR1078 "Génétique, Génomique Fonctionnelle et Biotechnologies", Univ Brest, EFS, IBSAM, Brest, France
- Université de Bretagne Occidentale, Faculté de Médecine et des sciences de la santé, Brest, France
| | - Pascal Trouvé
- Inserm, UMR1078 "Génétique, Génomique Fonctionnelle et Biotechnologies", Univ Brest, EFS, IBSAM, Brest, France
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23
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Wang H, Cebotaru L, Lee HW, Yang Q, Pollard BS, Pollard HB, Guggino WB. CFTR Controls the Activity of NF-κB by Enhancing the Degradation of TRADD. Cell Physiol Biochem 2016; 40:1063-1078. [PMID: 27960153 DOI: 10.1159/000453162] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/11/2016] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND/AIMS Chronic lung infection in cystic fibrosis leads to an inflammatory response that persists because of the chronic presence of bacteria and ultimately leads to a catastrophic failure of lung function. METHODS We use a combination of biochemistry, cell and molecular biology to study the interaction of TRADD, a key adaptor molecule in TNFα signaling, with CFTR in the regulation of NFκB. RESULTS We show that Wt CFTR binds to and colocalizes with TRADD. TRADD is a key signaling intermediate connecting TNFα with activation of NFκB. By contrast, ΔF508 CFTR does not bind to TRADD. NF-κB activation is higher in CFBE expressing ΔF508 CFTR than in cells expressing Wt CFTR. However, this differential effect is abolished when TRADD levels are knocked down. Transfecting Wt CFTR into CFBE cells reduces NF-κB activity. However the reduction is abolished by the CFTR chloride transport inhibitor-172. Consistently, transfecting in the correctly trafficked CFTR conduction mutants G551D or S341A also fail to reduce NFκB activity. Thus CFTR must be functional if it is to regulate NF-κB activity. We also found that TNFα produced a greater increase in NF-κB activity in CFBE cells than in the same cell when Wt CFTR-corrected. Consistently, the effect is also abolished when TRADD is knocked down by shRNA. Thus, Wt CFTR control of TRADD modulates the physiological activation of NF-κB by TNFα. Based on studies with proteosomal and lysosomal inhibitors, the mechanism by which Wt CFTR, but not ΔF508 CFTR, suppresses TRADD is by lysosomal degradation. CONCLUSION We have uncovered a novel mechanism whereby Wt CFTR regulates TNFα signaling by enhancing TRADD degradation. Thus by reducing the levels of TRADD, Wt CFTR suppresses downstream proinflammatory NFκB signaling. By contrast, suppression of NF-κB activation fails in CF cells expressing ΔF508 CFTR.
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Affiliation(s)
- Hua Wang
- Department of Physiology, Medicine, School of Medicine, The Johns Hopkins University, Baltimore, USA
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24
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Lasalvia M, Castellani S, D'Antonio P, Perna G, Carbone A, Colia AL, Maffione AB, Capozzi V, Conese M. Human airway epithelial cells investigated by atomic force microscopy: A hint to cystic fibrosis epithelial pathology. Exp Cell Res 2016; 348:46-55. [PMID: 27590528 DOI: 10.1016/j.yexcr.2016.08.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 08/17/2016] [Accepted: 08/29/2016] [Indexed: 01/01/2023]
Abstract
The pathophysiology of cystic fibrosis (CF) airway disease stems from mutations in the CF Transmembrane Conductance Regulator (CFTR) gene, leading to a chronic respiratory disease. Actin cytoskeleton is disorganized in CF airway epithelial cells, likely contributing to the CF-associated basic defects, i.e. defective chloride secretion and sodium/fluid hypersorption. In this work, we aimed to find whether this alteration could be pointed out by means of Atomic Force Microscopy (AFM) investigation, as roughness and Young's elastic module. Moreover, we also sought to determine whether disorganization of actin cytoskeleton is linked to hypersoption of apical fluid. Not only CFBE41o- (CFBE) cells, immortalized airway epithelial cells homozygous for the F508del CFTR allele, showed a different morphology in comparison with 16HBE14o- (16HBE) epithelial cells, wild-type for CFTR, but also they displayed a lack of stress fibers, suggestive of a disorganized actin cytoskeleton. AFM measurements showed that CFBE cells presented a higher membrane roughness and decreased rigidity as compared with 16HBE cells. CFBE overexpressing wtCFTR became more elongated than the parental CFBE cell line and presented actin stress fibers. CFBE cells absorbed more fluid from the apical compartment. Study of fluid absorption with the F-actin-depolymerizing agent Latrunculin B demonstrated that actin cytoskeletal disorganization increased fluid absorption, an effect observed at higher magnitude in 16HBE than in CFBE cells. For the first time, we demonstrate that actin cytoskeleton disorganization is reflected by AFM parameters in CF airway epithelial cells. Our data also strongly suggest that the lack of stress fibers is involved in at least one of the early step in CF pathophysiology at the levels of the airways, i.e. fluid hypersorption.
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Affiliation(s)
- Maria Lasalvia
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Bari, Italy
| | - Stefano Castellani
- Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy
| | - Palma D'Antonio
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Giuseppe Perna
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Bari, Italy
| | - Annalucia Carbone
- Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy
| | - Anna Laura Colia
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Angela Bruna Maffione
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy
| | - Vito Capozzi
- Department of Clinical and Experimental Medicine, University of Foggia, Foggia, Italy; Istituto Nazionale di Fisica Nucleare, Sezione di Bari, Bari, Italy
| | - Massimo Conese
- Department of Medical and Surgical Sciences, University of Foggia, Foggia, Italy.
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25
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Lipecka J, Chhuon C, Bourderioux M, Bessard MA, van Endert P, Edelman A, Guerrera IC. Sensitivity of mass spectrometry analysis depends on the shape of the filtration unit used for filter aided sample preparation (FASP). Proteomics 2016; 16:1852-7. [DOI: 10.1002/pmic.201600103] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 05/02/2016] [Accepted: 05/20/2016] [Indexed: 12/21/2022]
Affiliation(s)
- Joanna Lipecka
- The CPN Proteomics Facility - 3P5; Center of Psychiatry and Neuroscience; UMR INSERM 894 Paris France
- Université Paris Descartes; Sorbonne Paris Cité; Paris France
| | - Cerina Chhuon
- Proteomic Platform Necker, PPN-3P5; Structure Fédérative de Recherche SFR Necker US24; Paris France
- Université Paris Descartes; Sorbonne Paris Cité; Paris France
| | - Matthieu Bourderioux
- Proteomic Platform Necker, PPN-3P5; Structure Fédérative de Recherche SFR Necker US24; Paris France
- Université Paris Descartes; Sorbonne Paris Cité; Paris France
| | - Marie-Andrée Bessard
- Institut National de la Santé et de la Recherche Médicale; Unité 1151 Paris France
- Centre National de la Recherche Scientifique; Unité 8253 Paris France
- Université Paris Descartes; Sorbonne Paris Cité; Paris France
| | - Peter van Endert
- Institut National de la Santé et de la Recherche Médicale; Unité 1151 Paris France
- Centre National de la Recherche Scientifique; Unité 8253 Paris France
- Université Paris Descartes; Sorbonne Paris Cité; Paris France
| | - Aleksander Edelman
- Institut National de la Santé et de la Recherche Médicale; Unité 1151 Paris France
- Université Paris Descartes; Sorbonne Paris Cité; Paris France
| | - Ida Chiara Guerrera
- Proteomic Platform Necker, PPN-3P5; Structure Fédérative de Recherche SFR Necker US24; Paris France
- Université Paris Descartes; Sorbonne Paris Cité; Paris France
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26
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Pincikova T, Svedin E, Domsgen E, Flodström-Tullberg M, Hjelte L. Cystic fibrosis bronchial epithelial cells have impaired ability to activate vitamin D. Acta Paediatr 2016; 105:851-3. [PMID: 26865115 DOI: 10.1111/apa.13361] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Revised: 01/17/2016] [Accepted: 02/08/2016] [Indexed: 12/27/2022]
Affiliation(s)
- Terezia Pincikova
- Stockholm CF Center; Karolinska University Hospital Huddinge; Stockholm Sweden
- Division of Pediatrics; Department of Clinical Science, Intervention and Technology; Karolinska Institutet; Stockholm Sweden
- Department of Medicine; Center for Infectious Medicine; Karolinska Institutet; Karolinska University Hospital Huddinge; Stockholm Sweden
| | - Emma Svedin
- Department of Medicine; Center for Infectious Medicine; Karolinska Institutet; Karolinska University Hospital Huddinge; Stockholm Sweden
| | - Erna Domsgen
- Department of Medicine; Center for Infectious Medicine; Karolinska Institutet; Karolinska University Hospital Huddinge; Stockholm Sweden
| | - Malin Flodström-Tullberg
- Department of Medicine; Center for Infectious Medicine; Karolinska Institutet; Karolinska University Hospital Huddinge; Stockholm Sweden
| | - Lena Hjelte
- Stockholm CF Center; Karolinska University Hospital Huddinge; Stockholm Sweden
- Division of Pediatrics; Department of Clinical Science, Intervention and Technology; Karolinska Institutet; Stockholm Sweden
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27
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Rocca J, Manin S, Hulin A, Aissat A, Verbecq-Morlot W, Prulière-Escabasse V, Wohlhuter-Haddad A, Epaud R, Fanen P, Tarze A. New use for an old drug: COX-independent anti-inflammatory effects of sulindac in models of cystic fibrosis. Br J Pharmacol 2016; 173:1728-41. [PMID: 26894321 PMCID: PMC4867744 DOI: 10.1111/bph.13464] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2015] [Revised: 02/08/2016] [Accepted: 02/09/2016] [Indexed: 01/14/2023] Open
Abstract
Background and Purpose Pulmonary disease is the main cause of morbidity and mortality in cystic fibrosis (CF) patients due to exacerbated inflammation. To date, the only anti‐inflammatory drug available to CF patients is high‐dose ibuprofen, which can slow pulmonary disease progression, but whose cyclooxygenase‐dependent digestive adverse effects limit its clinical use. Here we have tested sulindac, another non‐steroidal anti‐inflammatory drug with an undefined anti‐inflammatory effect in CF airway epithelial cells. Experimental Approach Using in vitro and in vivo models, we NF‐κB activity and IL‐8 secretion. In HeLa‐F508del cells, we performed luciferase reporter gene assays in order to measure i) IL‐8 promoter activity, and ii) the activity of synthetic promoter containing NF‐κB responsive elements. We quantified IL‐8 secretion in airway epithelial CFBE cells cultured at an air‐liquid interface and in a mouse model of CF. Key Results Sulindac inhibited the transcriptional activity of NF‐κB and decreased IL‐8 transcription and secretion in TNF‐α stimulated CF cells via a cyclooxygenase‐independent mechanism. This effect was confirmed in vivo in a mouse model of CF induced by intra‐tracheal instillation of LPS, with a significant decrease of the induction of mRNA for MIP‐2, following treatment with sulindac. Conclusion and Implications Overall, sulindac decrease lung inflammation by a mechanism independent of cycolooxygenase. This drug could be beneficially employed in CF.
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Affiliation(s)
- Jérémy Rocca
- Inserm, U955, Equipe 5, Créteil, France.,Université Paris Est, UPEC, Créteil, France.,DHU Ageing-Thorax-Vessel-Blood, Créteil, France
| | - Sylvie Manin
- Inserm, U955, Equipe 5, Créteil, France.,DHU Ageing-Thorax-Vessel-Blood, Créteil, France
| | - Anne Hulin
- DHU Ageing-Thorax-Vessel-Blood, Créteil, France
| | - Abdel Aissat
- Inserm, U955, Equipe 5, Créteil, France.,Université Paris Est, UPEC, Créteil, France.,DHU Ageing-Thorax-Vessel-Blood, Créteil, France.,AP-HP, Hôpital H. Mondor-A. Chenevier, Pôle de Biologie, Créteil, France
| | - Wilfried Verbecq-Morlot
- Université Paris Est, UPEC, Créteil, France.,DHU Ageing-Thorax-Vessel-Blood, Créteil, France
| | - Virginie Prulière-Escabasse
- Inserm, U955, Equipe 5, Créteil, France.,Université Paris Est, UPEC, Créteil, France.,DHU Ageing-Thorax-Vessel-Blood, Créteil, France.,CHIC, service d'ORL, Créteil, France
| | | | - Ralph Epaud
- Inserm, U955, Equipe 5, Créteil, France.,Université Paris Est, UPEC, Créteil, France.,DHU Ageing-Thorax-Vessel-Blood, Créteil, France
| | - Pascale Fanen
- Inserm, U955, Equipe 5, Créteil, France.,Université Paris Est, UPEC, Créteil, France.,DHU Ageing-Thorax-Vessel-Blood, Créteil, France.,AP-HP, Hôpital H. Mondor-A. Chenevier, Pôle de Biologie, Créteil, France
| | - Agathe Tarze
- Inserm, U955, Equipe 5, Créteil, France.,Université Paris Est, UPEC, Créteil, France.,DHU Ageing-Thorax-Vessel-Blood, Créteil, France
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28
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Schwarzer C, Fischer H, Machen TE. Chemotaxis and Binding of Pseudomonas aeruginosa to Scratch-Wounded Human Cystic Fibrosis Airway Epithelial Cells. PLoS One 2016; 11:e0150109. [PMID: 27031335 PMCID: PMC4816407 DOI: 10.1371/journal.pone.0150109] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 02/09/2016] [Indexed: 11/18/2022] Open
Abstract
Confocal imaging was used to characterize interactions of Pseudomonas aeruginosa (PA, expressing GFP or labeled with Syto 11) with CF airway epithelial cells (CFBE41o-, grown as confluent monolayers with unknown polarity on coverglasses) in control conditions and following scratch wounding. Epithelia and PAO1-GFP or PAK-GFP (2 MOI) were incubated with Ringer containing typical extracellular salts, pH and glucose and propidium iodide (PI, to identify dead cells). PAO1 and PAK swam randomly over and did not bind to nonwounded CFBE41o- cells. PA migrated rapidly (began within 20 sec, maximum by 5 mins) and massively (10–80 fold increase, termed “swarming”), but transiently (random swimming after 15 mins), to wounds, particularly near cells that took up PI. Some PA remained immobilized on cells near the wound. PA swam randomly over intact CFBE41o- monolayers and wounded monolayers that had been incubated with medium for 1 hr. Expression of CFTR and altered pH of the media did not affect PA interactions with CFBE41o- wounds. In contrast, PAO1 swarming and immobilization along wounds was abolished in PAO1 (PAO1ΔcheYZABW, no expression of chemotaxis regulatory components cheY, cheZ, cheA, cheB and cheW) and greatly reduced in PAO1 that did not express amino acid receptors pctA, B and C (PAO1ΔpctABC) and in PAO1 incubated in Ringer containing a high concentration of mixed amino acids. Non-piliated PAKΔpilA swarmed normally towards wounded areas but bound infrequently to CFBE41o- cells. In contrast, both swarming and binding of PA to CFBE41o- cells near wounds were prevented in non-flagellated PAKΔfliC. Data are consistent with the idea that (i) PA use amino acid sensor-driven chemotaxis and flagella-driven swimming to swarm to CF airway epithelial cells near wounds and (ii) PA use pili to bind to epithelial cells near wounds.
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Affiliation(s)
- Christian Schwarzer
- Department of Molecular and Cell Biology, University of California, Berkeley, California, United States of America
| | - Horst Fischer
- Children’s Hospital Oakland Research Institute, Oakland, California, United States of America
| | - Terry E. Machen
- Department of Molecular and Cell Biology, University of California, Berkeley, California, United States of America
- * E-mail:
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29
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Suzuki S, Sargent RG, Illek B, Fischer H, Esmaeili-Shandiz A, Yezzi MJ, Lee A, Yang Y, Kim S, Renz P, Qi Z, Yu J, Muench MO, Beyer AI, Guimarães AO, Ye L, Chang J, Fine EJ, Cradick TJ, Bao G, Rahdar M, Porteus MH, Shuto T, Kai H, Kan YW, Gruenert DC. TALENs Facilitate Single-step Seamless SDF Correction of F508del CFTR in Airway Epithelial Submucosal Gland Cell-derived CF-iPSCs. MOLECULAR THERAPY. NUCLEIC ACIDS 2016; 5:e273. [PMID: 26730810 PMCID: PMC5012545 DOI: 10.1038/mtna.2015.43] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/17/2015] [Accepted: 10/17/2015] [Indexed: 12/22/2022]
Abstract
Cystic fibrosis (CF) is a recessive inherited disease associated with multiorgan damage that compromises epithelial and inflammatory cell function. Induced pluripotent stem cells (iPSCs) have significantly advanced the potential of developing a personalized cell-based therapy for diseases like CF by generating patient-specific stem cells that can be differentiated into cells that repair tissues damaged by disease pathology. The F508del mutation in airway epithelial cell-derived CF-iPSCs was corrected with small/short DNA fragments (SDFs) and sequence-specific TALENs. An allele-specific PCR, cyclic enrichment strategy gave ~100-fold enrichment of the corrected CF-iPSCs after six enrichment cycles that facilitated isolation of corrected clones. The seamless SDF-based gene modification strategy used to correct the CF-iPSCs resulted in pluripotent cells that, when differentiated into endoderm/airway-like epithelial cells showed wild-type (wt) airway epithelial cell cAMP-dependent Cl ion transport or showed the appropriate cell-type characteristics when differentiated along mesoderm/hematopoietic inflammatory cell lineage pathways.
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Affiliation(s)
- Shingo Suzuki
- Department of Otolaryngology - Head and Neck Surgery, University of California-San Francisco, San Francisco, California, USA.,Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - R Geoffrey Sargent
- Department of Otolaryngology - Head and Neck Surgery, University of California-San Francisco, San Francisco, California, USA.,California Pacific Medical Center Research Institute, San Francisco, California, USA
| | - Beate Illek
- Childrens Hospital Oakland Research Institute, Oakland, California, USA
| | - Horst Fischer
- Childrens Hospital Oakland Research Institute, Oakland, California, USA
| | - Alaleh Esmaeili-Shandiz
- Department of Otolaryngology - Head and Neck Surgery, University of California-San Francisco, San Francisco, California, USA
| | - Michael J Yezzi
- Department of Otolaryngology - Head and Neck Surgery, University of California-San Francisco, San Francisco, California, USA.,California Pacific Medical Center Research Institute, San Francisco, California, USA
| | - Albert Lee
- Department of Otolaryngology - Head and Neck Surgery, University of California-San Francisco, San Francisco, California, USA.,Present address: Graduate Program in Biochemistry, Molecular, Cellular, and Developmental Biology, University of California-Davis, Davis, California, USA
| | - Yanu Yang
- California Pacific Medical Center Research Institute, San Francisco, California, USA.,Present address: Molecular Department, Hunter Laboratories, Campbell, California, USA
| | - Soya Kim
- Liver Center, University of California-San Francisco, San Francisco, California, USA.,Present address: Heinrich-Heine-Universität Düsseldorf, Institut für Genetik, Düsseldorf, Germany
| | - Peter Renz
- Department of Otolaryngology - Head and Neck Surgery, University of California-San Francisco, San Francisco, California, USA.,California Pacific Medical Center Research Institute, San Francisco, California, USA.,Present address: Graduate Program in the Department of Biosystems Science and Engineering, ETH, Zürich, Switzerland
| | - Zhongxia Qi
- Department of Laboratory Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Jingwei Yu
- Department of Laboratory Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Marcus O Muench
- Department of Laboratory Medicine, University of California-San Francisco, San Francisco, California, USA.,Liver Center, University of California-San Francisco, San Francisco, California, USA.,Blood Systems Research Institute, San Francisco, California, USA
| | - Ashley I Beyer
- Blood Systems Research Institute, San Francisco, California, USA
| | | | - Lin Ye
- Department of Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Judy Chang
- Department of Medicine, University of California-San Francisco, San Francisco, California, USA
| | - Eli J Fine
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Thomas J Cradick
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Gang Bao
- Department of Biomedical Engineering, Georgia Institute of Technology, Atlanta, Georgia, USA
| | - Meghdad Rahdar
- Department of Pediatrics, Stanford University, Stanford, California, USA
| | - Matthew H Porteus
- Department of Pediatrics, Stanford University, Stanford, California, USA
| | - Tsuyoshi Shuto
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Hirofumi Kai
- Department of Molecular Medicine, Graduate School of Pharmaceutical Sciences, Kumamoto University, Kumamoto, Japan
| | - Yuet W Kan
- Department of Medicine, University of California-San Francisco, San Francisco, California, USA.,Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Helen Diller Family Comprehensive Cancer Center, Institute for Human Genetics, Cardiovascular Research Institute, University of California-San Francisco, San Francisco, California, USA
| | - Dieter C Gruenert
- Department of Otolaryngology - Head and Neck Surgery, University of California-San Francisco, San Francisco, California, USA.,California Pacific Medical Center Research Institute, San Francisco, California, USA.,Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, Helen Diller Family Comprehensive Cancer Center, Institute for Human Genetics, Cardiovascular Research Institute, University of California-San Francisco, San Francisco, California, USA.,Department of Pediatrics, University of Vermont College of Medicine, Burlington, Vermont, USA
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30
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Nimishakavi S, Raymond WW, Gruenert DC, Caughey GH. Divergent Inhibitor Susceptibility among Airway Lumen-Accessible Tryptic Proteases. PLoS One 2015; 10:e0141169. [PMID: 26485396 PMCID: PMC4612780 DOI: 10.1371/journal.pone.0141169] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 10/04/2015] [Indexed: 12/21/2022] Open
Abstract
Tryptic serine proteases of bronchial epithelium regulate ion flux, barrier integrity, and allergic inflammation. Inhibition of some of these proteases is a strategy to improve mucociliary function in cystic fibrosis and asthmatic inflammation. Several inhibitors have been tested in pre-clinical animal models and humans. We hypothesized that these inhibitors inactivate a variety of airway protease targets, potentially with bystander effects. To establish relative potencies and modes of action, we compared inactivation of human prostasin, matriptase, airway trypsin-like protease (HAT), and β-tryptase by nafamostat, camostat, bis(5-amidino-2-benzimidazolyl)methane (BABIM), aprotinin, and benzamidine. Nafamostat achieved complete, nearly stoichiometric and very slowly reversible inhibition of matriptase and tryptase, but inhibited prostasin less potently and was weakest versus HAT. The IC50 of nafamostat’s leaving group, 6-amidino-2-naphthol, was >104-fold higher than that of nafamostat itself, consistent with suicide rather than product inhibition as mechanisms of prolonged inactivation. Stoichiometric release of 6-amidino-2-naphthol allowed highly sensitive fluorometric estimation of active-site concentration in preparations of matriptase and tryptase. Camostat inactivated all enzymes but was less potent overall and weakest towards matriptase, which, however was strongly inhibited by BABIM. Aprotinin exhibited nearly stoichiometric inhibition of prostasin and matriptase, but was much weaker towards HAT and was completely ineffective versus tryptase. Benzamidine was universally weak. Thus, each inhibitor profile was distinct. Nafamostat, camostat and aprotinin markedly reduced tryptic activity on the apical surface of cystic fibrosis airway epithelial monolayers, suggesting prostasin as the major source of such activity and supporting strategies targeting prostasin for inactivation.
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Affiliation(s)
- Shilpa Nimishakavi
- Cardiovascular Research Institute, University of California San Francisco, San Francisco, California, United States of America
- Veterans Affairs Medical Center, San Francisco, California, United States of America
| | - Wilfred W. Raymond
- Cardiovascular Research Institute, University of California San Francisco, San Francisco, California, United States of America
- Veterans Affairs Medical Center, San Francisco, California, United States of America
| | - Dieter C. Gruenert
- Cardiovascular Research Institute, University of California San Francisco, San Francisco, California, United States of America
- Department of Otolaryngology-Head and Neck Surgery, University of California San Francisco, San Francisco, California, United States of America
- Eli and Edythe Broad Center for Regenerative Medicine and Stem Cell Research, University of California San Francisco, San Francisco, California, United States of America
- Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, California, United States of America
- Institute for Human Genetics, University of California San Francisco, San Francisco, California, United States of America
- Department of Pediatrics, University of Vermont College of Medicine, Burlington, Vermont, United States of America
| | - George H. Caughey
- Cardiovascular Research Institute, University of California San Francisco, San Francisco, California, United States of America
- Veterans Affairs Medical Center, San Francisco, California, United States of America
- Department of Medicine, University of California San Francisco, San Francisco, California, United States of America
- * E-mail:
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31
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Dhooghe B, Bouckaert C, Capron A, Wallemacq P, Leal T, Noel S. Resveratrol increases F508del-CFTR dependent salivary secretion in cystic fibrosis mice. Biol Open 2015; 4:929-36. [PMID: 26092868 PMCID: PMC4571083 DOI: 10.1242/bio.010967] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Cystic fibrosis (CF) is a fatal genetic disease associated with widespread exocrine gland dysfunction. Studies have suggested activating effects of resveratrol, a naturally-occurring polyphenol compound with antioxidant and anti-inflammatory properties, on CF transmembrane conductance regulator (CFTR) protein function. We assayed, in F508del-CFTR homozygous (CF) and in wild-type mice, the effect of resveratrol on salivary secretion in basal conditions, in response to inhibition by atropine (basal β-adrenergic-dependent component) and to stimulation by isoprenaline (CFTR-dependent component). Both components of the salivary secretion were smaller in CF mice than in controls. Two hours after intraperitoneal administration of resveratrol (50 mg/kg) dissolved in DMSO, the compound was detected in salivary glands. As in both CF and in wild-type mice, DMSO alone increased the response to isoprenaline in males but not in females, the effect of resveratrol was only measured in females. In wild-type mice, isoprenaline increased secretion by more than half. In CF mice, resveratrol rescued the response to isoprenaline, eliciting a 2.5-fold increase of β-adrenergic-stimulated secretion. We conclude that the salivary secretion assay is suitable to test DMSO-soluble CFTR modulators in female mice. We show that resveratrol applied in vivo to mice reaches salivary glands and increases β-adrenergic secretion. Immunolabelling of CFTR in human bronchial epithelial cells suggests that the effect is associated with increased CFTR protein expression. Our data support the view that resveratrol is beneficial for treating CF. The salivary secretion assay has a potential application to test efficacy of novel CF therapies.
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Affiliation(s)
- Barbara Dhooghe
- Louvain Centre for Toxicology and Applied Pharmacology, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, Brussels B1200, Belgium
| | - Charlotte Bouckaert
- Louvain Centre for Toxicology and Applied Pharmacology, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, Brussels B1200, Belgium
| | - Arnaud Capron
- Clinical Chemistry Department, Cliniques Universitaires St. Luc, Université Catholique de Louvain, Brussels B1200, Belgium
| | - Pierre Wallemacq
- Clinical Chemistry Department, Cliniques Universitaires St. Luc, Université Catholique de Louvain, Brussels B1200, Belgium
| | - Teresinha Leal
- Louvain Centre for Toxicology and Applied Pharmacology, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, Brussels B1200, Belgium
| | - Sabrina Noel
- Louvain Centre for Toxicology and Applied Pharmacology, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, Brussels B1200, Belgium
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32
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Molenda N, Urbanova K, Weiser N, Kusche-Vihrog K, Günzel D, Schillers H. Paracellular transport through healthy and cystic fibrosis bronchial epithelial cell lines--do we have a proper model? PLoS One 2014; 9:e100621. [PMID: 24945658 PMCID: PMC4063962 DOI: 10.1371/journal.pone.0100621] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Accepted: 05/29/2014] [Indexed: 11/18/2022] Open
Abstract
It has been reported recently that the cystic fibrosis transmembrane conductance regulator (CFTR) besides transcellular chloride transport, also controls the paracellular permeability of bronchial epithelium. The aim of this study was to test whether overexpressing wtCFTR solely regulates paracellular permeability of cell monolayers. To answer this question we used a CFBE41o- cell line transfected with wtCFTR or mutant F508del-CFTR and compered them with parental line and healthy 16HBE14o- cells. Transepithelial electrical resistance (TER) and paracellular fluorescein flux were measured under control and CFTR-stimulating conditions. CFTR stimulation significant decreased TER in 16HBE14o- and also in CFBE41o- cells transfected with wtCFTR. In contrast, TER increased upon stimulation in CFBE41o- cells and CFBE41o- cells transfected with F508del-CFTR. Under non-stimulated conditions, all four cell lines had similar paracellular fluorescein flux. Stimulation increased only the paracellular permeability of the 16HBE14o- cell monolayers. We observed that 16HBE14o- cells were significantly smaller and showed a different structure of cell-cell contacts than CFBE41o- and its overexpressing clones. Consequently, 16HBE14o- cells have about 80% more cell-cell contacts through which electrical current and solutes can leak. Also tight junction protein composition is different in 'healthy' 16HBE14o- cells compared to 'cystic fibrosis' CFBE41o- cells. We found that claudin-3 expression was considerably stronger in 16HBE14o- cells than in the three CFBE41o- cell clones and thus independent of the presence of functional CFTR. Together, CFBE41o- cell line transfection with wtCFTR modifies transcellular conductance, but not the paracellular permeability. We conclude that CFTR overexpression is not sufficient to fully reconstitute transport in CF bronchial epithelium. Hence, it is not recommended to use those cell lines to study CFTR-dependent epithelial transport.
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Affiliation(s)
- Natalia Molenda
- Institute of Physiology II, University of Münster, Münster, Germany
| | | | - Nelly Weiser
- Institute of Physiology II, University of Münster, Münster, Germany
| | | | - Dorothee Günzel
- Institute of Clinical Physiology, Charité Campus Benjamin Franklin, Berlin, Germany
| | - Hermann Schillers
- Institute of Physiology II, University of Münster, Münster, Germany
- * E-mail:
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33
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Koeppen K, Coutermarsh BA, Madden DR, Stanton BA. Serum- and glucocorticoid-induced protein kinase 1 (SGK1) increases the cystic fibrosis transmembrane conductance regulator (CFTR) in airway epithelial cells by phosphorylating Shank2E protein. J Biol Chem 2014; 289:17142-50. [PMID: 24811177 DOI: 10.1074/jbc.m114.555599] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The glucocorticoid dexamethasone increases cystic fibrosis transmembrane conductance regulator (CFTR) abundance in human airway epithelial cells by a mechanism that requires serum- and glucocorticoid-induced protein kinase 1 (SGK1) activity. The goal of this study was to determine whether SGK1 increases CFTR abundance by phosphorylating Shank2E, a PDZ domain protein that contains two SGK1 phosphorylation consensus sites. We found that SGK1 phosphorylates Shank2E as well as a peptide containing the first SGK1 consensus motif of Shank2E. The dexamethasone-induced increase in CFTR abundance was diminished by overexpression of a dominant-negative Shank2E in which the SGK1 phosphorylation sites had been mutated. siRNA-mediated reduction of Shank2E also reduced the dexamethasone-induced increase in CFTR abundance. Taken together, these data demonstrate that the glucocorticoid-induced increase in CFTR abundance requires phosphorylation of Shank2E at an SGK1 consensus site.
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Affiliation(s)
- Katja Koeppen
- From the Department of Microbiology and Immunology and
| | | | - Dean R Madden
- Department of Biochemistry, The Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755
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34
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Benz N, Le Hir S, Norez C, Kerbiriou M, Calvez ML, Becq F, Trouvé P, Férec C. Improvement of chloride transport defect by gonadotropin-releasing hormone (GnRH) in cystic fibrosis epithelial cells. PLoS One 2014; 9:e88964. [PMID: 24586461 PMCID: PMC3929654 DOI: 10.1371/journal.pone.0088964] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Accepted: 01/16/2014] [Indexed: 11/18/2022] Open
Abstract
Cystic fibrosis (CF), the most common autosomal recessive disease in Caucasians, is due to mutations in the CFTR gene. F508del, the most frequent mutation in patients, impairs CFTR protein folding and biosynthesis. The F508del-CFTR protein is retained in the endoplasmic reticulum (ER) and its traffic to the plasma membrane is altered. Nevertheless, if it reaches the cell surface, it exhibits a Cl− channel function despite a short half-life. Pharmacological treatments may target the F508del-CFTR defect directly by binding to the mutant protein or indirectly by altering cellular proteostasis, and promote its plasma membrane targeting and stability. We previously showed that annexine A5 (AnxA5) directly binds to F508del-CFTR and, when overexpressed, promotes its membrane stability, leading to the restoration of some Cl− channel function in cells. Because Gonadotropin-Releasing Hormone (GnRH) increases AnxA5 expression in some cells, we tested it in CF cells. We showed that human epithelial cells express GnRH-receptors (GnRH-R) and that GnRH induces an AnxA5 overexpression and an increased Cl− channel function in F508del-CFTR cells, due to an increased stability of the protein in the membranes. Beside the numerous physiological implications of the GnRH-R expression in epithelial cells, we propose that a topical use of GnRH is a potential treatment in CF.
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Affiliation(s)
- Nathalie Benz
- Institut National de la Santé et de la Recherche Médicale, UMR1078, Brest, France
- Association Gaetan Saleun, Brest, France
| | - Sophie Le Hir
- Institut National de la Santé et de la Recherche Médicale, UMR1078, Brest, France
- C.H.U. Brest, Hôpital Morvan, Laboratoire de Génétique Moléculaire, Brest, France
| | - Caroline Norez
- Institut de Physiologie et Biologie Cellulaires, Centre national de la recherche scientifique FRE 3511, Université de Poitiers, Poitiers, France
| | - Mathieu Kerbiriou
- Institut National de la Santé et de la Recherche Médicale, UMR1078, Brest, France
- Université de Bretagne Occidentale, Faculté de Médecine et des sciences de la santé, Brest, France
| | - Marie-Laure Calvez
- Institut National de la Santé et de la Recherche Médicale, UMR1078, Brest, France
- Université de Bretagne Occidentale, Faculté de Médecine et des sciences de la santé, Brest, France
| | - Frédéric Becq
- Institut de Physiologie et Biologie Cellulaires, Centre national de la recherche scientifique FRE 3511, Université de Poitiers, Poitiers, France
| | - Pascal Trouvé
- Institut National de la Santé et de la Recherche Médicale, UMR1078, Brest, France
- * E-mail: (PT); (CF)
| | - Claude Férec
- Institut National de la Santé et de la Recherche Médicale, UMR1078, Brest, France
- C.H.U. Brest, Hôpital Morvan, Laboratoire de Génétique Moléculaire, Brest, France
- Université de Bretagne Occidentale, Faculté de Médecine et des sciences de la santé, Brest, France
- Etablissement Français du Sang - Bretagne, Brest, France
- * E-mail: (PT); (CF)
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Blanchard E, Zlock L, Lao A, Mika D, Namkung W, Xie M, Scheitrum C, Gruenert DC, Verkman AS, Finkbeiner WE, Conti M, Richter W. Anchored PDE4 regulates chloride conductance in wild-type and ΔF508-CFTR human airway epithelia. FASEB J 2013; 28:791-801. [PMID: 24200884 DOI: 10.1096/fj.13-240861] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Cystic fibrosis (CF) is caused by mutations in the gene encoding the cystic fibrosis transmembrane conductance regulator (CFTR) that impair its expression and/or chloride channel function. Here, we provide evidence that type 4 cyclic nucleotide phosphodiesterases (PDE4s) are critical regulators of the cAMP/PKA-dependent activation of CFTR in primary human bronchial epithelial cells. In non-CF cells, PDE4 inhibition increased CFTR activity under basal conditions (ΔISC 7.1 μA/cm(2)) and after isoproterenol stimulation (increased ΔISC from 13.9 to 21.0 μA/cm(2)) and slowed the return of stimulated CFTR activity to basal levels by >3-fold. In cells homozygous for ΔF508-CFTR, the most common mutation found in CF, PDE4 inhibition alone produced minimal channel activation. However, PDE4 inhibition strongly amplified the effects of CFTR correctors, drugs that increase expression and membrane localization of CFTR, and/or CFTR potentiators, drugs that increase channel gating, to reach ∼ 25% of the chloride conductance observed in non-CF cells. Biochemical studies indicate that PDE4s are anchored to CFTR and mediate a local regulation of channel function. Taken together, our results implicate PDE4 as an important determinant of CFTR activity in airway epithelia, and support the use of PDE4 inhibitors to potentiate the therapeutic benefits of CFTR correctors and potentiators.
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Affiliation(s)
- Elise Blanchard
- 1Department of Obstetrics, Gynecology, and Reproductive Sciences, University of California San Francisco, 513 Parnassus Ave., Box 0556, San Francisco, CA 94143-0556, USA.
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Insulin-like growth factor 1 (IGF-1) enhances the protein expression of CFTR. PLoS One 2013; 8:e59992. [PMID: 23555857 PMCID: PMC3610909 DOI: 10.1371/journal.pone.0059992] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Accepted: 02/25/2013] [Indexed: 11/19/2022] Open
Abstract
Low levels of insulin-like growth factor 1 (IGF-1) have been observed in the serum of cystic fibrosis (CF) patients. However, the effects of low serum IGF-1 on the cystic fibrosis transmembrane conductance regulator (CFTR), whose defective function is the primary cause of cystic fibrosis, have not been studied. Here, we show in human cells that IGF-1 increases the steady-state levels of mature wildtype CFTR in a CFTR-associated ligand (CAL)- and TC10-dependent manner; moreover, IGF-1 increases CFTR-mediated chloride transport. Using an acceptor photobleaching fluorescence resonance energy transfer (FRET) assay, we have confirmed the binding of CAL and CFTR in the Golgi. We also show that CAL overexpression inhibits forskolin-induced increases in the cell-surface expression of CFTR. We found that IGF-1 activates TC10, and active TC10 alters the functional association between CAL and CFTR. Furthermore, IGF-1 and active TC10 can reverse the CAL-mediated reduction in the cell-surface expression of CFTR. IGF-1 does not increase the expression of ΔF508 CFTR, whose processing is arrested in the ER. This finding is consistent with our observation that IGF-1 alters the functional interaction of CAL and CFTR in the Golgi. However, when ΔF508 CFTR is rescued with low temperature or the corrector VRT-325 and proceeds to the Golgi, IGF-1 can increase the expression of the rescued ΔF508 CFTR. Our data support a model indicating that CAL-CFTR binding in the Golgi inhibits CFTR trafficking to the cell surface, leading CFTR to the degradation pathway instead. IGF-1-activated TC10 changes the interaction of CFTR and CAL, allowing CFTR to progress to the plasma membrane. These findings offer a potential strategy using a combinational treatment of IGF-1 and correctors to increase the post-Golgi expression of CFTR in cystic fibrosis patients bearing the ΔF508 mutation.
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Cebotaru L, Woodward O, Cebotaru V, Guggino WB. Transcomplementation by a truncation mutant of cystic fibrosis transmembrane conductance regulator (CFTR) enhances ΔF508 processing through a biomolecular interaction. J Biol Chem 2013; 288:10505-12. [PMID: 23463513 DOI: 10.1074/jbc.m112.420489] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We previously showed that a truncation mutant of CFTR missing the first four transmembrane segments of TMD1, Δ264 CFTR, binds to key elements in the ER quality control mechanism to increase the amounts of the mature C band of both wt and ΔF508 CFTR through transcomplementation. Here, we created a new construct, Δ27-264 CFTR. Even though Δ27-264 CFTR is rapidly degraded in the proteasome, steady state protein can be detected by Western blot. Δ27-264 CFTR can also increase the amounts of the mature C band of both wt and ΔF508 CFTR through transcomplementation. Electrophysiology experiments show that Δ27-264 CFTR can restore chloride channel currents. Further experiments with the conduction mutant S341A show conclusively that currents are indeed generated by rescued channel function of ΔF508 CFTR. Immunoprecipitation studies show that Δ27-264 binds to ΔF508-CFTR, suggesting a bimolecular interaction. Thus the adeno-associated viral vector, rAAV-Δ27-264 CFTR, is a highly promising CF gene therapy vector, because it increases the amount of mature band C protein both from wt and ΔF508 CFTR, and rescues channel activity of ΔF508 CFTR.
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Affiliation(s)
- Liudmila Cebotaru
- Department of Ophthalmology, Johns Hopkins University, Baltimore, Maryland 21205, USA
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Kelly C, Canning P, Buchanan PJ, Williams MT, Brown V, Gruenert DC, Elborn JS, Ennis M, Schock BC. Toll-like receptor 4 is not targeted to the lysosome in cystic fibrosis airway epithelial cells. Am J Physiol Lung Cell Mol Physiol 2013; 304:L371-82. [PMID: 23316065 PMCID: PMC4073939 DOI: 10.1152/ajplung.00372.2011] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2011] [Accepted: 01/03/2013] [Indexed: 01/13/2023] Open
Abstract
The innate immune response to bacterial infection is mediated through Toll-like receptors (TLRs), which trigger tightly regulated signaling cascades through transcription factors including NF-κB. LPS activation of TLR4 triggers internalization of the receptor-ligand complex which is directed toward lysosomal degradation or endocytic recycling. Cystic fibrosis (CF) patients display a robust and uncontrolled inflammatory response to bacterial infection, suggesting a defect in regulation. This study examined the intracellular trafficking of TLR4 in CF and non-CF airway epithelial cells following stimulation with LPS. We employed cells lines [16hBE14o-, CFBE41o- (CF), and CFTR-complemented CFBE41o-] and confirmed selected experiments in primary nasal epithelial cells from non-CF controls and CF patients (F508del homozygous). In control cells, TLR4 expression (surface and cytoplasmic) was reduced after LPS stimulation but remained unchanged in CF cells and was accompanied by a heightened inflammatory response 24 h after stimulation. All cells expressed markers of the early (EEA1) and late (Rab7b) endosomes at basal levels. However, only CF cells displayed persistent expression of Rab7b following LPS stimulation. Rab7 variants may directly internalize bacteria to the Golgi for recycling or to the lysosome for degradation. TLR4 colocalized with the lysosomal marker LAMP1 in 16 hBE14o- cells, suggesting that TLR4 is targeted for lysosomal degradation in these cells. However, this colocalization was not observed in CFBE41o- cells, where persistent expression of Rab7 and release of proinflammatory cytokines was detected. Consistent with the apparent inability of CF cells to target TLR4 toward the lysosome for degradation, we observed persistent surface and cytoplasmic expression of this pathogen recognition receptor. This defect may account for the prolonged cycle of chronic inflammation associated with CF.
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Affiliation(s)
- Catriona Kelly
- Centre for Infection and Immunity, Queen's University of Belfast, Belfast, UK
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Moniz S, Sousa M, Moraes BJ, Mendes AI, Palma M, Barreto C, Fragata JI, Amaral MD, Matos P. HGF stimulation of Rac1 signaling enhances pharmacological correction of the most prevalent cystic fibrosis mutant F508del-CFTR. ACS Chem Biol 2013; 8:432-42. [PMID: 23148778 DOI: 10.1021/cb300484r] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Cystic fibrosis (CF), a major life-limiting genetic disease leading to severe respiratory symptoms, is caused by mutations in CF transmembrane conductance regulator (CFTR), a chloride (Cl(-)) channel expressed at the apical membrane of epithelial cells. Absence of functional CFTR from the surface of respiratory cells reduces mucociliary clearance, promoting airways obstruction, chronic infection, and ultimately lung failure. The most frequent mutation, F508del, causes the channel to misfold, triggering its premature degradation and preventing it from reaching the cell surface. Recently, novel small-molecule correctors rescuing plasma membrane localization of F508del-CFTR underwent clinical trials but with limited success. Plausibly, this may be due to the mutant intrinsic plasma membrane (PM) instability. Herein, we show that restoration of F508del-CFTR PM localization by correctors can be dramatically improved through a novel pathway involving stimulation of signaling by the endogenous small GTPase Rac1 via hepatocyte growth factor (HGF). We first show that CFTR anchors to apical actin cytoskeleton (via Ezrin) upon activation of Rac1 signaling through PIP5K and Arp2/3. We then found that such anchoring retains pharmacologically rescued F508del-CFTR at the cell surface, boosting functional restoration by correctors up to 30% of wild-type channel levels in human airway epithelial cells. Our findings reveal that surface anchoring and retention is a major target pathway for CF pharmacotherapy, namely, to achieve maximal restoration of F508del-CFTR in patients in combination with correctors. Moreover, this approach may also translate to other disorders caused by trafficking-deficient surface proteins.
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Affiliation(s)
- Sónia Moniz
- Department of Genetics, National Health Institute ‘Dr. Ricardo Jorge’, Av. Padre Cruz, 1649-016 Lisboa;
Portugal
- Faculty of Sciences,
BioFIG
- Centre for Biodiversity, Functional and Integrative Genomics, University of Lisboa, Campo Grande-C8, 1749-016 Lisboa,
Portugal
| | - Marisa Sousa
- Department of Genetics, National Health Institute ‘Dr. Ricardo Jorge’, Av. Padre Cruz, 1649-016 Lisboa;
Portugal
- Faculty of Sciences,
BioFIG
- Centre for Biodiversity, Functional and Integrative Genomics, University of Lisboa, Campo Grande-C8, 1749-016 Lisboa,
Portugal
| | - Bruno José Moraes
- Department of Genetics, National Health Institute ‘Dr. Ricardo Jorge’, Av. Padre Cruz, 1649-016 Lisboa;
Portugal
- Faculty of Sciences,
BioFIG
- Centre for Biodiversity, Functional and Integrative Genomics, University of Lisboa, Campo Grande-C8, 1749-016 Lisboa,
Portugal
| | - Ana Isabel Mendes
- Department of Genetics, National Health Institute ‘Dr. Ricardo Jorge’, Av. Padre Cruz, 1649-016 Lisboa;
Portugal
- Faculty of Sciences,
BioFIG
- Centre for Biodiversity, Functional and Integrative Genomics, University of Lisboa, Campo Grande-C8, 1749-016 Lisboa,
Portugal
| | - Marta Palma
- Faculty of Sciences,
BioFIG
- Centre for Biodiversity, Functional and Integrative Genomics, University of Lisboa, Campo Grande-C8, 1749-016 Lisboa,
Portugal
| | - Celeste Barreto
- Department of Pediatrics, Hospital de Santa Maria, Avenida Professor Egas Moniz,
1649-035 Lisboa, Portugal
| | - José I. Fragata
- Department of Cardiothoracic
Surgery, Hospital de Santa Marta, R. de
Santa Marta 50, 1169-024 Lisboa, Portugal
| | - Margarida D. Amaral
- Department of Genetics, National Health Institute ‘Dr. Ricardo Jorge’, Av. Padre Cruz, 1649-016 Lisboa;
Portugal
- Faculty of Sciences,
BioFIG
- Centre for Biodiversity, Functional and Integrative Genomics, University of Lisboa, Campo Grande-C8, 1749-016 Lisboa,
Portugal
| | - Paulo Matos
- Department of Genetics, National Health Institute ‘Dr. Ricardo Jorge’, Av. Padre Cruz, 1649-016 Lisboa;
Portugal
- Faculty of Sciences,
BioFIG
- Centre for Biodiversity, Functional and Integrative Genomics, University of Lisboa, Campo Grande-C8, 1749-016 Lisboa,
Portugal
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Cystic fibrosis CFBE41o- cells contain TLR1 SNP I602S and fail to respond to Mycobacterium abscessus. J Cyst Fibros 2013; 12:773-9. [PMID: 23403223 DOI: 10.1016/j.jcf.2013.01.001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Revised: 11/30/2012] [Accepted: 01/03/2013] [Indexed: 11/22/2022]
Abstract
BACKGROUND Mycobacterium abscessus causes lung infection in patients with cystic fibrosis. M. abscessus stimulates the host innate immune response via TLR2 on respiratory epithelial cells. Signaling through TLR2 requires the formation of TLR2/TLR1 heterodimers on the cell surface. METHODS The ability of M. abscessus to stimulate the innate immune response of cystic fibrosis CFBE41o- respiratory epithelial cells was measured as expression of HβD2 by RT PCR, and release of IL-8 by ELISA. Genotyping of CFBE41o- TLR polymorphisms was carried out. RESULTS CFBE41o- cells are hyporesponsive to M. abscessus. They are homozygous for the TLR1 SNP I602S which has been demonstrated to cause diminished cellular responses to TLR2 agonists. CONCLUSIONS Homozygosity for I602S is prevalent in Western Europeans and North American Caucasians, the same demographic in which the ΔF508 mutation is present. This SNP may play a role in the pathogenesis of M. abscessus lung infection in patients with cystic fibrosis.
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Baudouin-Legros M, Colas J, Moriceau S, Kelly M, Planelles G, Edelman A, Ollero M. Long-term CFTR inhibition modulates 15d-prostaglandin J2 in human pulmonary cells. Int J Biochem Cell Biol 2012; 44:1009-18. [DOI: 10.1016/j.biocel.2012.03.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2011] [Revised: 03/16/2012] [Accepted: 03/21/2012] [Indexed: 10/28/2022]
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Nimishakavi S, Besprozvannaya M, Raymond WW, Craik CS, Gruenert DC, Caughey GH. Activity and inhibition of prostasin and matriptase on apical and basolateral surfaces of human airway epithelial cells. Am J Physiol Lung Cell Mol Physiol 2012; 303:L97-106. [PMID: 22582115 DOI: 10.1152/ajplung.00303.2011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Prostasin is a membrane-anchored protease expressed in airway epithelium, where it stimulates salt and water uptake by cleaving the epithelial Na(+) channel (ENaC). Prostasin is activated by another transmembrane tryptic protease, matriptase. Because ENaC-mediated dehydration contributes to cystic fibrosis (CF), prostasin and matriptase are potential therapeutic targets, but their catalytic competence on airway epithelial surfaces has been unclear. Seeking tools for exploring sites and modulation of activity, we used recombinant prostasin and matriptase to identify substrate t-butyloxycarbonyl-l-Gln-Ala-Arg-4-nitroanilide (QAR-4NA), which allowed direct assay of proteases in living cells. Comparisons of bronchial epithelial cells (CFBE41o-) with and without functioning cystic fibrosis transmembrane conductance regulator (CFTR) revealed similar levels of apical and basolateral aprotinin-inhibitable activity. Although recombinant matriptase was more active than prostasin in hydrolyzing QAR-4NA, cell surface activity resisted matriptase-selective inhibition, suggesting that prostasin dominates. Surface biotinylation revealed similar expression of matriptase and prostasin in epithelial cells expressing wild-type vs. ΔF508-mutated CFTR. However, the ratio of mature to inactive proprostasin suggested surface enrichment of active enzyme. Although small amounts of matriptase and prostasin were shed spontaneously, prostasin anchored to the cell surface by glycosylphosphatidylinositol was the major contributor to observed QAR-4NA-hydrolyzing activity. For example, the apical surface of wild-type CFBE41o- epithelial cells express 22% of total, extractable, aprotinin-inhibitable, QAR-4NA-hydrolyzing activity and 16% of prostasin immunoreactivity. In conclusion, prostasin is present, mature and active on the apical surface of wild-type and CF bronchial epithelial cells, where it can be targeted for inhibition via the airway lumen.
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A Staphylococcus aureus pore-forming toxin subverts the activity of ADAM10 to cause lethal infection in mice. Nat Med 2011; 17:1310-4. [PMID: 21926978 PMCID: PMC3192248 DOI: 10.1038/nm.2451] [Citation(s) in RCA: 315] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Accepted: 07/22/2011] [Indexed: 11/08/2022]
Abstract
Staphylococcus aureus is a major cause of human disease, responsible for half a million infections and approximately 20,000 deaths per year in the United States alone 1,2. This pathogen secretes α-hemolysin, a pore-forming cytotoxin that contributes to the pathogenesis of pneumonia 3–5. α-hemolysin injures epithelial cells by interacting with its receptor, the zinc-dependent metalloprotease ADAM10 6. We show that mice harboring a conditional disruption of the Adam10 gene in lung epithelium are resistant to lethal pneumonia. Investigation of the molecular mechanism of toxin-receptor function revealed that α-hemolysin upregulates ADAM10 metalloprotease activity in alveolar epithelial cells, resulting in cleavage of the adherens junction protein E-cadherin. Cleavage is associated with disruption of epithelial barrier function, contributing to the pathogenesis of lethal acute lung injury. A metalloprotease inhibitor of ADAM10 prevents E-cadherin cleavage; similarly, E-cadherin proteolysis and barrier disruption is attenuated in ADAM10 knockout mice. Together, these data attest to the function of ADAM10 as the cellular receptor for α-hemolysin. The observation that Hla can usurp the metalloprotease activity of its receptor reveals a novel mechanism of pore-forming cytotoxin action in which pathologic insults are not solely the result of irreversible membrane injury, and defines ADAM10 inhibition as a strategy for disease modification.
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Balghi H, Robert R, Rappaz B, Zhang X, Wohlhuter-Haddad A, Evagelidis A, Luo Y, Goepp J, Ferraro P, Roméo P, Trebak M, Wiseman PW, Thomas DY, Hanrahan JW. Enhanced Ca2+ entry due to Orai1 plasma membrane insertion increases IL-8 secretion by cystic fibrosis airways. FASEB J 2011; 25:4274-91. [PMID: 21873556 DOI: 10.1096/fj.11-187682] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Cystic fibrosis (CF) is caused by mutations in the gene encoding the CF transmembrane conductance regulator (CFTR). The most common mutation, ΔF508, causes retention of CFTR in the endoplasmic reticulum (ER). Some CF abnormalities can be explained by altered Ca(2+) homeostasis, although it remains unknown how CFTR influences calcium signaling. This study examined the novel hypothesis that store-operated calcium entry (SOCE) through Orai1 is abnormal in CF. The significance of Orai1-mediated SOCE for increased interleukin-8 (IL-8) expression in CF was also investigated. CF and non-CF human airway epithelial cell line and primary cells (obtained at lung transplantation) were used in Ca(2+) imaging, electrophysiology, and fluorescence imaging experiments to explore differences in Orai1 function in CF vs. non-CF cells. Protein expression and localization was assessed by Western blots, cell surface biotinylation, ELISA, and image correlation spectroscopy (ICS). We show here that store-operated Ca(2+) entry (SOCE) is elevated in CF human airway epithelial cells (hAECs; ≈ 1.8- and ≈ 2.5-fold for total Ca(2+)(i) increase and Ca(2+) influx rate, respectively, and ≈ 2-fold increase in the I(CRAC) current) and is caused by increased exocytotic insertion (≈ 2-fold) of Orai1 channels into the plasma membrane, which is normalized by rescue of ΔF508-CFTR trafficking to the cell surface. Augmented SOCE in CF cells is a major factor leading to increased IL-8 secretion (≈ 2-fold). CFTR normally down-regulates the Orai1/stromal interaction molecule 1 (STIM1) complex, and loss of this inhibition due to the absence of CFTR at the plasma membrane helps to explain the potentiated inflammatory response in CF cells.
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Affiliation(s)
- Haouaria Balghi
- Department of Physiology, McGill University, Montréal, Québec, Canada.
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John G, Chillappagari S, Rubin BK, Gruenert DC, Henke MO. Reduced surface toll-like receptor-4 expression and absent interferon-γ-inducible protein-10 induction in cystic fibrosis airway cells. Exp Lung Res 2011; 37:319-26. [PMID: 21649525 DOI: 10.3109/01902148.2011.569968] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
ABSTRACT As part of the innate and adaptive immune system, airway epithelial cells secrete proinflammatory cytokines after activation of Toll-like receptors (TLRs) by pathogens. Nevertheless, cystic fibrosis (CF) airways are chronically infected with Pseudomonas aeruginosa, suggesting a modified immune response in CF. The authors have shown that in CF bronchial epithelial cells, a reduced surface expression of TLR-4 causes a diminished interleukin (IL)-8 and IL-6 response upon lipopolysaccharide (LPS) stimulation. However, there is no information regarding activation of the MyD88 (myeloid differentiation primary response gene 88)-independent TLR-4 signaling pathway by LPS, which results in the activation of adaptive immune responses by secretion of the T cell-recruiting chemokine interferon-γ-inducible protein (IP)-10. Therefore, the authors investigated the induction of IP-10 in CF bronchial epithelial cell line CFBE41o- and its CFTR-corrected isotype under well-differentiating conditions. TLR-4 surface expression was significantly reduced in CFBE41o- by a factor of 2, compared to the CFTR-corrected cells. In CFTR-corrected cells, stimulation with LPS increased IP-10 secretion. Incubating cells with siRNA directed against TLR-4 inhibited the LPS stimulated increase of IP-10 in CFTR-corrected cells. The reduced TLR-4 surface expression in CF cells causes the loss of induction of IP-10 by LPS. This could compromise adaptive immune responses in CF due to a reduced T-cell recruitment.
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Affiliation(s)
- Gerrit John
- Department of Pulmonary Medicine, Philipps-University Marburg, Marburg, Germany
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Illek B, Lei D, Fischer H, Gruenert DC. Sensitivity of chloride efflux vs. transepithelial measurements in mixed CF and normal airway epithelial cell populations. Cell Physiol Biochem 2011; 26:983-90. [PMID: 21220929 DOI: 10.1159/000324011] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/15/2010] [Indexed: 12/12/2022] Open
Abstract
BACKGROUND/AIMS While the Cl(-) efflux assays are relatively straightforward, their ability to assess the efficacy of phenotypic correction in cystic fibrosis (CF) tissue or cells may be limited. Accurate assessment of therapeutic efficacy, i.e., correlating wild type CF transmembrane conductance regulator (CFTR) levels with phenotypic correction in tissue or individual cells, requires a sensitive assay. METHODS Radioactive chloride ((36)Cl) efflux was compared to Ussing chamber analysis for measuring cAMP-dependent Cl(-) transport in mixtures of human normal (16HBE14o-) and cystic fibrosis (CF) (CFTE29o- or CFBE41o-, respectively) airway epithelial cells. Cell mixtures with decreasing amounts of 16HBE14o- cells were evaluated. RESULTS Efflux and Ussing chamber studies on mixed populations of normal and CF airway epithelial cells showed that, as the number of CF cells within the population was progressively increased, the cAMP-dependent Cl(-) decreased. The (36)Cl efflux assay was effective for measuring Cl(-) transport when ≥ 25% of the cells were normal. If < 25% of the cells were phenotypically wild-type (wt), the (36)Cl efflux assay was no longer reliable. Polarized CFBE41o- cells, also homozygous for the ΔF508 mutation, were used in the Ussing chamber studies. Ussing analysis detected cAMP-dependent Cl(-) currents in mixtures with ≥1% wild-type cells indicating that Ussing analysis is more sensitive than (36)Cl efflux analysis for detection of functional CFTR. CONCLUSIONS Assessment of CFTR function by Ussing analysis is more sensitive than (36)Cl efflux analysis. Ussing analysis indicates that cell mixtures containing 10% 16HBE14o- cells showed 40-50% of normal cAMP-dependent Cl(-) transport that drops off exponentially between 10-1% wild-type cells.
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Affiliation(s)
- Beate Illek
- Children's Hospital Oakland Research Institute, Oakland, USA
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Fischer H, Illek B, Sachs L, Finkbeiner WE, Widdicombe JH. CFTR and calcium-activated chloride channels in primary cultures of human airway gland cells of serous or mucous phenotype. Am J Physiol Lung Cell Mol Physiol 2010; 299:L585-94. [PMID: 20675434 PMCID: PMC2957417 DOI: 10.1152/ajplung.00421.2009] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2009] [Accepted: 07/30/2010] [Indexed: 11/22/2022] Open
Abstract
Using cell culture models, we have investigated the relative importance of cystic fibrosis transmembrane conductance regulator (CFTR) and calcium-activated chloride channels (CaCC) in Cl secretion by mucous and serous cells of human airway glands. In transepithelial recordings in Ussing chambers, the CFTR inhibitor CFTR(inh)-172 abolished 60% of baseline Cl secretion in serous cells and 70% in mucous. Flufenamic acid (FFA), an inhibitor of CaCC, reduced baseline Cl secretion by ∼20% in both cell types. Methacholine and ATP stimulated Cl secretion in both cell types, which was largely blocked by treatment with 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid (BAPTA) and partially by mucosal FFA or CFTR(inh)-172 with the exception of methacholine responses in mucous cells, which were not blocked by FFA and partially (∼60%) by CFTR(inh)-172. The effects of ionomycin on short-circuit current (I(sc)) were less than those of ATP or methacholine. Forskolin stimulated Cl secretion only if Cl in the mucosal medium was replaced by gluconate. In whole cell patch-clamp studies of single isolated cells, cAMP-induced Cl currents were ∼3-fold greater in serous than mucous cells. Ionomycin-induced Cl currents were 13 times (serous) or 26 times (mucous) greater than those generated by cAMP and were blocked by FFA. In serous cells, mRNA for transmembrane protein 16A (TMEM16A) was ∼10 times more abundant than mRNA for CFTR. In mucous cells it was ∼100 times more abundant. We conclude: 1) serous and mucous cells both make significant contributions to gland fluid secretion; 2) baseline Cl secretion in both cell types is mediated predominantly by CFTR, but CaCC becomes increasingly important after mediator-induced elevations of intracellular Ca; and 3) the high CaCC currents seen in patch-clamp studies and the high TMEM16A expression in intact polarized cells sheets are not reflected in transepithelial current recordings.
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Affiliation(s)
- Horst Fischer
- Children’s Hospital Oakland Research Institute, Oakland, California, USA
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Schwarzer C, Wong S, Shi J, Matthes E, Illek B, Ianowski JP, Arant RJ, Isacoff E, Vais H, Foskett JK, Maiellaro I, Hofer AM, Machen TE. Pseudomonas aeruginosa Homoserine lactone activates store-operated cAMP and cystic fibrosis transmembrane regulator-dependent Cl- secretion by human airway epithelia. J Biol Chem 2010; 285:34850-63. [PMID: 20739289 DOI: 10.1074/jbc.m110.167668] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The ubiquitous bacterium Pseudomonas aeruginosa frequently causes hospital-acquired infections. P. aeruginosa also infects the lungs of cystic fibrosis (CF) patients and secretes N-(3-oxo-dodecanoyl)-S-homoserine lactone (3O-C12) to regulate bacterial gene expression critical for P. aeruginosa persistence. In addition to its effects as a quorum-sensing gene regulator in P. aeruginosa, 3O-C12 elicits cross-kingdom effects on host cell signaling leading to both pro- or anti-inflammatory effects. We find that in addition to these slow effects mediated through changes in gene expression, 3O-C12 also rapidly increases Cl(-) and fluid secretion in the cystic fibrosis transmembrane regulator (CFTR)-expressing airway epithelia. 3O-C12 does not stimulate Cl(-) secretion in CF cells, suggesting that lactone activates the CFTR. 3O-C12 also appears to directly activate the inositol trisphosphate receptor and release Ca(2+) from the endoplasmic reticulum (ER), lowering [Ca(2+)] in the ER and thereby activating the Ca(2+)-sensitive ER signaling protein STIM1. 3O-C12 increases cytosolic [Ca(2+)] and, strikingly, also cytosolic [cAMP], the known activator of CFTR. Activation of Cl(-) current by 3O-C12 was inhibited by a cAMP antagonist and increased by a phosphodiesterase inhibitor. Finally, a Ca(2+) buffer that lowers [Ca(2+)] in the ER similar to the effect of 3O-C12 also increased cAMP and I(Cl). The results suggest that 3O-C12 stimulates CFTR-dependent Cl(-) and fluid secretion in airway epithelial cells by activating the inositol trisphosphate receptor, thus lowering [Ca(2+)] in the ER and activating STIM1 and store-operated cAMP production. In CF airways, where CFTR is absent, the adaptive ability to rapidly flush the bacteria away is compromised because the lactone cannot affect Cl(-) and fluid secretion.
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Affiliation(s)
- Christian Schwarzer
- Department of Molecular and Cell Biology, University of California, Berkeley, California 94720-3200, USA
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Auriche C, Di Domenico EG, Pierandrei S, Lucarelli M, Castellani S, Conese M, Melani R, Zegarra-Moran O, Ascenzioni F. CFTR expression and activity from the human CFTR locus in BAC vectors, with regulatory regions, isolated by a single-step procedure. Gene Ther 2010; 17:1341-54. [PMID: 20535216 DOI: 10.1038/gt.2010.89] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
We have assembled two BAC vectors containing a single fragment spanning the entire CFTR locus and including the upstream and downstream regions. The two vectors differ in size of the upstream region, and were recovered in Escherichia coli, with intact BAC DNAs prepared for structural and functional analyses. Sequence analysis allowed precise mapping of the inserts. We show that the CFTR gene was wild type and is categorized as the most frequent haplotype in Caucasian populations, identified by the following polymorphisms: (GATT)₇ in intron 6a; (TG)₁₁T₇ in intron 8; V470 at position 470. CFTR expression and activity were analyzed in model cells by RT-PCR, quantitative real-time PCR, western blotting, indirect immunofluorescence and electrophysiological methods, which show the presence of an active CFTR Cl ⁻ channel. Finally, and supporting the hypothesis that CFTR functions as a receptor for Pseudomonas aeruginosa, we show that CFTR-expressing cells internalized more bacteria than parental cells that do not express CFTR. Overall, these data demonstrate that the BAC vectors contain a functional CFTR fragment and have unique features, including derivation from a single fragment, availability of a detailed genomic map and the possibility to use standard extraction procedures for BAC DNA preparations.
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Affiliation(s)
- C Auriche
- Dipartimento di Biologia Cellulare e dello Sviluppo, Sapienza Università di Roma, Roma, Italy
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Maurisse R, De Semir D, Emamekhoo H, Bedayat B, Abdolmohammadi A, Parsi H, Gruenert DC. Comparative transfection of DNA into primary and transformed mammalian cells from different lineages. BMC Biotechnol 2010; 10:9. [PMID: 20144189 PMCID: PMC2830169 DOI: 10.1186/1472-6750-10-9] [Citation(s) in RCA: 128] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2009] [Accepted: 02/08/2010] [Indexed: 11/18/2022] Open
Abstract
Background The delivery of DNA into human cells has been the basis of advances in the understanding of gene function and the development of genetic therapies. Numerous chemical and physical approaches have been used to deliver the DNA, but their efficacy has been variable and is highly dependent on the cell type to be transfected. Results Studies were undertaken to evaluate and compare the transfection efficacy of several chemical reagents to that of the electroporation/nucleofection system using both adherent cells (primary and transformed airway epithelial cells and primary fibroblasts as well as embryonic stem cells) and cells in suspension (primary hematopoietic stem/progenitor cells and lymphoblasts). With the exception of HEK 293 cell transfection, nucleofection proved to be less toxic and more efficient at effectively delivering DNA into the cells as determined by cell proliferation and GFP expression, respectively. Lipofectamine and nucleofection of HEK 293 were essentially equivalent in terms of toxicity and efficiency. Transient transfection efficiency in all the cell systems ranged from 40%-90%, with minimal toxicity and no apparent species specificity. Differences in efficiency and toxicity were cell type/system specific. Conclusions In general, the Amaxa electroporation/nucleofection system appears superior to other chemical systems. However, there are cell-type and species specific differences that need to be evaluated empirically to optimize the conditions for transfection efficiency and cell survival.
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Affiliation(s)
- Rosalie Maurisse
- California Pacific Medical Center Research Institute, San Francisco, CA, USA
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