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Rezende TMT, Macera G, Heyndrickx L, Michiels J, Coppens S, Thibaut HJ, Dallmeier K, Van Esbroeck M, Neyts J, Ariën KK, Bartholomeeusen K. Validation of a Reporter Cell Line for Flavivirus Inhibition Assays. Microbiol Spectr 2023; 11:e0502722. [PMID: 36786659 PMCID: PMC10100686 DOI: 10.1128/spectrum.05027-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Accepted: 01/25/2023] [Indexed: 02/15/2023] Open
Abstract
Here, we report the validation of a new reporter cell line, Hec1a-IFNB-Luc, for use in inhibition studies of various flaviviruses relevant to human pathology. The reporter system allows the detection of viral replication after luciferase gene activation driven by an interferon beta (IFN-β) promoter. We found the reporter cell line to be highly responsive to all 10 flaviviruses tested, including the 4 dengue virus serotypes. The applicability of the Hec1a-IFNB-Luc reporter cell line for serodiagnostic purposes in neutralizing antibody assays was confirmed by comparison of its sensitivity and specificity to those of "gold-standard," clinically applied, cytopathic effect-based assays, showing comparable performances. The reporter cell line used for the assessment of viral inhibition by small-molecule antiviral compounds was also confirmed, and the sensitivity of the Hec1a-IFNB-Luc reporter cell line was compared to those from published data reporting on the activity of the antivirals in various other assays, indicating that the Hec1a-IFNB-Luc reporter cell line allowed the determination of the inhibitory capacity at least as sensitive as alternative assays. By measuring luciferase activity as a proxy for viral replication, the reporter cell line allows early detection, reducing the time to results from often 5 to 7 days to 3 days, without the need for optical inspection of cytopathic effects, which often differ between viruses and cell lines, streamlining the development of flavivirus assays. IMPORTANCE The Hec1a-IFNB-Luc reporter cell line allows the detection of all 10 flaviviruses tested, including the 4 dengue virus serotypes. Its use for serodiagnostic purposes, measuring neutralizing antibody activity in sera, and the assessment of the antiviral activities of small-molecule compounds was confirmed, and it was found to be comparable to clinically applied assays. The Hec1a-IFNB-Luc reporter cell line allows the rapid and quantitative determination of antiviral effects on multiple human pathological flaviviruses using a single protocol.
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Affiliation(s)
- Tatiana M. T. Rezende
- Institute of Tropical Medicine, Department of Biomedical Sciences, Virology Unit, Antwerp, Belgium
| | - Gabriella Macera
- Institute of Tropical Medicine, Department of Biomedical Sciences, Virology Unit, Antwerp, Belgium
| | - Leo Heyndrickx
- Institute of Tropical Medicine, Department of Biomedical Sciences, Virology Unit, Antwerp, Belgium
| | - Johan Michiels
- Institute of Tropical Medicine, Department of Biomedical Sciences, Virology Unit, Antwerp, Belgium
| | - Sandra Coppens
- Institute of Tropical Medicine, Department of Biomedical Sciences, Virology Unit, Antwerp, Belgium
| | - Hendrik Jan Thibaut
- KU Leuven Department of Microbiology, Immunology and Transplantation, Rega Institute, Laboratory of Virology and Chemotherapy, Translational Platform Virology and Chemotherapy (TPVC), Leuven, Belgium
| | - Kai Dallmeier
- KU Leuven Department of Microbiology, Immunology and Transplantation, Rega Institute, Laboratory of Virology and Chemotherapy, Molecular Vaccinology and Vaccine Discovery (MVVD), Leuven, Belgium
| | - Marjan Van Esbroeck
- Institute of Tropical Medicine, Department of Clinical Sciences, Clinical Reference Lab, Antwerp, Belgium
| | - Johan Neyts
- KU Leuven Department of Microbiology, Immunology and Transplantation, Rega Institute, Laboratory of Virology and Chemotherapy, Molecular Vaccinology and Vaccine Discovery (MVVD), Leuven, Belgium
| | - Kevin K. Ariën
- Institute of Tropical Medicine, Department of Biomedical Sciences, Virology Unit, Antwerp, Belgium
| | - Koen Bartholomeeusen
- Institute of Tropical Medicine, Department of Biomedical Sciences, Virology Unit, Antwerp, Belgium
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Molina JA, Yang Z. Rapid and quantitative evaluation of VACV-induced host shutoff using newly generated cell lines stably expressing secreted Gaussia luciferase. J Med Virol 2022; 94:3811-3819. [PMID: 35415899 PMCID: PMC9197853 DOI: 10.1002/jmv.27773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 04/08/2022] [Accepted: 04/09/2022] [Indexed: 11/06/2022]
Abstract
Host shutoff, characterized by a global decline of cellular protein synthesis, is commonly observed in many viral infections, including vaccinia virus. Classic methods measuring host shutoff include the use of radioactive or non-radioactive probes to label newly synthesized proteins followed by radioautography or sodium dodecyl-sulfate polyacrylamide gel electrophoresis (SDS-PAGE) to resolve the proteins for follow-up detection. While these are highly reliable methods, they are time- and labor-consuming. Here we generated two cell lines stably expressing secreted Gaussia luciferase. These reporter cells allow rapid, quantitative, and consecutive monitoring of host shutoff from a single infection sample. We evaluated host shutoff induced by wild-type and various mutant vaccinia viruses using the reporter cell lines. The results validated the utilities of the reporter cells and quantitatively characterized vaccinia virus-induced host shutoff at different stages of replication. Notably, the results also indicated additional major unidentified VACV shutoff factors. Our study provides new tool to study host shutoff. The reporter cells are also suitable for high throughput settings and rapid testing of clinically isolated viruses. In combination with classical methods, this tool will greatly facilitate understanding of virus-induced host shutoff, and protein synthesis shutoff caused by other physiologically relevant stresses. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Joshua A Molina
- Department of Veterinary Pathobiology, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, USA.,Division of Biology, Kansas State University, Manhattan, KS, USA
| | - Zhilong Yang
- Department of Veterinary Pathobiology, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, TX, USA.,Division of Biology, Kansas State University, Manhattan, KS, USA
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3
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Schreiber AM, Li Y, Chen YH, Napierala JS, Napierala M. Selected Histone Deacetylase Inhibitors Reverse the Frataxin Transcriptional Defect in a Novel Friedreich's Ataxia Induced Pluripotent Stem Cell-Derived Neuronal Reporter System. Front Neurosci 2022; 16:836476. [PMID: 35281493 PMCID: PMC8904878 DOI: 10.3389/fnins.2022.836476] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2021] [Accepted: 01/12/2022] [Indexed: 11/23/2022] Open
Abstract
Friedreich's ataxia (FRDA) is a neurodegenerative disorder caused by the expansion of guanine-adenine-adenine repeats within the first intron of the frataxin (FXN) gene. The location and nature of the expansion have been proven to contribute to transcriptional repression of FXN by decreasing the rate of polymerase II (RNA polymerase II) progression and increasing the presence of histone modifications associated with a heterochromatin-like state. Targeting impaired FXN transcription appears as a feasible option for therapeutic intervention, while no cure currently exists. We created a novel reporter cell line containing an FXN-Nanoluciferase (FXN-NLuc) fusion in induced pluripotent stem cells (iPSCs) reprogrammed from the fibroblasts of patients with FRDA, thus allowing quantification of endogenous FXN expression. The use of iPSCs provides the opportunity to differentiate these cells into disease-relevant neural progenitor cells (NPCs). NPCs derived from the FXN-NLuc line responded to treatments with a known FXN inducer, RG109. Results were validated by quantitative PCR and Western blot in multiple FRDA NPC lines. We then screened a commercially available library of compounds consisting of molecules targeting various enzymes and pathways critical for silencing or activation of gene expression. Only selected histone deacetylase inhibitors were capable of partial reactivation of FXN expression. This endogenous, FRDA iPSC-derived reporter can be utilized for high-throughput campaigns performed in cells most relevant to disease pathology in search of FXN transcription activators.
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Affiliation(s)
- Anna M. Schreiber
- Department of Biochemistry and Molecular Genetics, Stem Cell Institute, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Yanjie Li
- Department of Biochemistry and Molecular Genetics, Stem Cell Institute, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Yi-Hsien Chen
- Genome Engineering and iPSC Center, Washington University, St. Louis, MO, United States
| | - Jill S. Napierala
- Department of Biochemistry and Molecular Genetics, Stem Cell Institute, University of Alabama at Birmingham, Birmingham, AL, United States
| | - Marek Napierala
- Department of Biochemistry and Molecular Genetics, Stem Cell Institute, University of Alabama at Birmingham, Birmingham, AL, United States
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Burov A, Funikov S, Vagapova E, Dalina A, Rezvykh A, Shyrokova E, Lebedev T, Grigorieva E, Popenko V, Leonova O, Spasskaya D, Spirin P, Prassolov V, Karpov V, Morozov A. A Cell-Based Platform for the Investigation of Immunoproteasome Subunit β5i Expression and Biology of β5i-Containing Proteasomes. Cells 2021; 10:3049. [PMID: 34831272 DOI: 10.3390/cells10113049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2021] [Revised: 10/24/2021] [Accepted: 11/02/2021] [Indexed: 11/17/2022] Open
Abstract
The degradation of most intracellular proteins is a dynamic and tightly regulated process performed by proteasomes. To date, different forms of proteasomes have been identified. Currently the role of non-constitutive proteasomes (immunoproteasomes (iPs) and intermediate proteasomes (intPs)) has attracted special attention. Here, using a CRISPR-Cas9 nickase technology, four cell lines: histiocytic lymphoma, colorectal adenocarcinoma, cervix adenocarcinoma, and hepatocarcinoma were modified to express proteasomes with mCherry-tagged β5i subunit, which is a catalytic subunit of iPs and intPs. Importantly, the expression of the chimeric gene in modified cells is under the control of endogenous regulatory mechanisms and is increased following IFN-γ and/or TNF-α stimulation. Fluorescent proteasomes retain catalytic activity and are distributed within the nucleus and cytoplasm. RNAseq reveals marginal differences in gene expression profiles between the modified and wild-type cell lines. Predominant metabolic pathways and patterns of expressed receptors were identified for each cell line. Using established cell lines, we demonstrated that anti-cancer drugs Ruxolitinib, Vincristine and Gefitinib stimulated the expression of β5i-containing proteasomes, which might affect disease prognosis. Taken together, obtained cell lines can be used as a platform for real-time studies of immunoproteasome gene expression, localization of iPs and intPs, interaction of non-constitutive proteasomes with other proteins, proteasome trafficking and many other aspects of proteasome biology in living cells. Moreover, the established platform might be especially useful for fast and large-scale experiments intended to evaluate the effects of different conditions including treatment with various drugs and compounds on the proteasome pool.
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Shaker MR, Pietrogrande G, Martin S, Lee JH, Sun W, Wolvetang EJ. Rapid and Efficient Generation of Myelinating Human Oligodendrocytes in Organoids. Front Cell Neurosci 2021; 15:631548. [PMID: 33815061 PMCID: PMC8010307 DOI: 10.3389/fncel.2021.631548] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 02/23/2021] [Indexed: 12/12/2022] Open
Abstract
Human stem cell derived brain organoids are increasingly gaining attention as an ideal model system for investigating neurological diseases, particularly those that involve myelination defects. However, current protocols for generating brain organoids with sufficiently mature oligodendrocytes that deposit myelin on endogenously produced neurons are lengthy and complicated. Taking advantage of a human pluripotent stem cell line that reports on SOX10 expression, we developed a protocol that involves a 42 day exposure of neuroectoderm-derived organoids to a cocktail of growth factors and small molecules that collectively foster oligodendrocyte specification and survival. Importantly, the resulting day 42 brain organoids contain both myelinating oligodendrocytes, cortical neuronal cells and astrocytes. These oligodendrocyte brain organoids therefore constitute a valuable and tractable platform for functional neurogenomics and drug screening for white matter diseases.
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Affiliation(s)
- Mohammed R. Shaker
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia
| | - Giovanni Pietrogrande
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia
| | - Sally Martin
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia
- School of Biomedical Sciences, The University of Queensland, Brisbane, QLD, Australia
| | - Ju-Hyun Lee
- Department of Anatomy, Brain Korea 21 Plus Program for Biomedical Science, Korea University College of Medicine, Seoul, South Korea
| | - Woong Sun
- Department of Anatomy, Brain Korea 21 Plus Program for Biomedical Science, Korea University College of Medicine, Seoul, South Korea
| | - Ernst J. Wolvetang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD, Australia
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Elbadawy HM, Mohammed Abdul MI, Aljuhani N, Vitiello A, Ciccarese F, Shaker MA, Eltahir HM, Palù G, Di Antonio V, Ghassabian H, Del Vecchio C, Salata C, Franchin E, Ponterio E, Bahashwan S, Thabet K, Abouzied MM, Shehata AM, Parolin C, Calistri A, Alvisi G. Generation of Combinatorial Lentiviral Vectors Expressing Multiple Anti-Hepatitis C Virus shRNAs and Their Validation on a Novel HCV Replicon Double Reporter Cell Line. Viruses 2020; 12:v12091044. [PMID: 32962117 PMCID: PMC7551853 DOI: 10.3390/v12091044] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Revised: 09/14/2020] [Accepted: 09/15/2020] [Indexed: 12/12/2022] Open
Abstract
Despite the introduction of directly acting antivirals (DAAs), for the treatment of hepatitis C virus (HCV) infection, their cost, patient compliance, and viral resistance are still important issues to be considered. Here, we describe the generation of a novel JFH1-based HCV subgenomic replicon double reporter cell line suitable for testing different antiviral drugs and therapeutic interventions. This cells line allowed a rapid and accurate quantification of cell growth/viability and HCV RNA replication, thus discriminating specific from unspecific antiviral effects caused by DAAs or cytotoxic compounds, respectively. By correlating cell number and virus replication, we could confirm the inhibitory effect on the latter of cell over confluency and characterize an array of lentiviral vectors expressing single, double, or triple cassettes containing different combinations of short hairpin (sh)RNAs, targeting both highly conserved viral genome sequences and cellular factors crucial for HCV replication. While all vectors were effective in reducing HCV replication, the ones targeting viral sequences displayed a stronger antiviral effect, without significant cytopathic effects. Such combinatorial platforms as well as the developed double reporter cell line might find application both in setting-up anti-HCV gene therapy approaches and in studies aimed at further dissecting the viral biology/pathogenesis of infection.
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Affiliation(s)
- Hossein M. Elbadawy
- Department of Pharmacology and Toxicology, College of Pharmacy, Taibah University, Almadinah Almunawwarah 41477, Saudi Arabia; (H.M.E.); (N.A.); (H.M.E.); (S.B.); (M.M.A.); (A.M.S.)
| | - Mohi I. Mohammed Abdul
- Department of Pharmacology and Toxicology, College of Pharmacy, Taibah University, Almadinah Almunawwarah 41477, Saudi Arabia; (H.M.E.); (N.A.); (H.M.E.); (S.B.); (M.M.A.); (A.M.S.)
- Correspondence: (M.I.M.A.); (A.C.); (G.A.)
| | - Naif Aljuhani
- Department of Pharmacology and Toxicology, College of Pharmacy, Taibah University, Almadinah Almunawwarah 41477, Saudi Arabia; (H.M.E.); (N.A.); (H.M.E.); (S.B.); (M.M.A.); (A.M.S.)
| | - Adriana Vitiello
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (A.V.); (F.C.); (G.P.); (V.D.A.); (H.G.); (C.D.V.); (C.S.); (E.F.); (E.P.); (C.P.)
| | - Francesco Ciccarese
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (A.V.); (F.C.); (G.P.); (V.D.A.); (H.G.); (C.D.V.); (C.S.); (E.F.); (E.P.); (C.P.)
- Immunology and Molecular Oncology Unit, Veneto Institute of Oncology IOV-IRCCS, 35128 Padua, Italy
| | - Mohamed A. Shaker
- Pharmaceutics and Pharmaceutical Technology Department, College of Pharmacy, Taibah University, Almadinah Almunawwarah 41477, Saudi Arabia;
- Pharmaceutics Department, Faculty of Pharmacy, Helwan University, Cairo 11795, Egypt
| | - Heba M. Eltahir
- Department of Pharmacology and Toxicology, College of Pharmacy, Taibah University, Almadinah Almunawwarah 41477, Saudi Arabia; (H.M.E.); (N.A.); (H.M.E.); (S.B.); (M.M.A.); (A.M.S.)
| | - Giorgio Palù
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (A.V.); (F.C.); (G.P.); (V.D.A.); (H.G.); (C.D.V.); (C.S.); (E.F.); (E.P.); (C.P.)
| | - Veronica Di Antonio
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (A.V.); (F.C.); (G.P.); (V.D.A.); (H.G.); (C.D.V.); (C.S.); (E.F.); (E.P.); (C.P.)
- Immunology and Molecular Oncology Unit, Veneto Institute of Oncology IOV-IRCCS, 35128 Padua, Italy
| | - Hanieh Ghassabian
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (A.V.); (F.C.); (G.P.); (V.D.A.); (H.G.); (C.D.V.); (C.S.); (E.F.); (E.P.); (C.P.)
| | - Claudia Del Vecchio
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (A.V.); (F.C.); (G.P.); (V.D.A.); (H.G.); (C.D.V.); (C.S.); (E.F.); (E.P.); (C.P.)
| | - Cristiano Salata
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (A.V.); (F.C.); (G.P.); (V.D.A.); (H.G.); (C.D.V.); (C.S.); (E.F.); (E.P.); (C.P.)
| | - Elisa Franchin
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (A.V.); (F.C.); (G.P.); (V.D.A.); (H.G.); (C.D.V.); (C.S.); (E.F.); (E.P.); (C.P.)
| | - Eleonora Ponterio
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (A.V.); (F.C.); (G.P.); (V.D.A.); (H.G.); (C.D.V.); (C.S.); (E.F.); (E.P.); (C.P.)
- Fondazione Policlinico Universitario "A. Gemelli"—I.R.C.C.S., 00168 Rome, Italy
| | - Saleh Bahashwan
- Department of Pharmacology and Toxicology, College of Pharmacy, Taibah University, Almadinah Almunawwarah 41477, Saudi Arabia; (H.M.E.); (N.A.); (H.M.E.); (S.B.); (M.M.A.); (A.M.S.)
| | - Khaled Thabet
- Department of Biochemistry, Faculty of Pharmacy, Minia University, Minia 61519, Egypt;
| | - Mekky M. Abouzied
- Department of Pharmacology and Toxicology, College of Pharmacy, Taibah University, Almadinah Almunawwarah 41477, Saudi Arabia; (H.M.E.); (N.A.); (H.M.E.); (S.B.); (M.M.A.); (A.M.S.)
- Department of Biochemistry, Faculty of Pharmacy, Minia University, Minia 61519, Egypt;
| | - Ahmed M. Shehata
- Department of Pharmacology and Toxicology, College of Pharmacy, Taibah University, Almadinah Almunawwarah 41477, Saudi Arabia; (H.M.E.); (N.A.); (H.M.E.); (S.B.); (M.M.A.); (A.M.S.)
- Department of Pharmacology and toxicology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef 62511, Egypt
| | - Cristina Parolin
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (A.V.); (F.C.); (G.P.); (V.D.A.); (H.G.); (C.D.V.); (C.S.); (E.F.); (E.P.); (C.P.)
| | - Arianna Calistri
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (A.V.); (F.C.); (G.P.); (V.D.A.); (H.G.); (C.D.V.); (C.S.); (E.F.); (E.P.); (C.P.)
- Correspondence: (M.I.M.A.); (A.C.); (G.A.)
| | - Gualtiero Alvisi
- Department of Molecular Medicine, University of Padua, 35121 Padua, Italy; (A.V.); (F.C.); (G.P.); (V.D.A.); (H.G.); (C.D.V.); (C.S.); (E.F.); (E.P.); (C.P.)
- Correspondence: (M.I.M.A.); (A.C.); (G.A.)
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Kim JI, Kaufman RJ, Back SH, Moon JY. Development of a Reporter System Monitoring Regulated Intramembrane Proteolysis of the Transmembrane bZIP Transcription Factor ATF6α. Mol Cells 2019; 42:783-793. [PMID: 31707777 PMCID: PMC6883980 DOI: 10.14348/molcells.2019.0104] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 09/11/2019] [Accepted: 09/30/2019] [Indexed: 12/20/2022] Open
Abstract
When endoplasmic reticulum (ER) functions are perturbed, the ER induces several signaling pathways called unfolded protein response to reestablish ER homeostasis through three ER transmembrane proteins: inositol-requiring enzyme 1 (IRE1), PKR-like ER kinase (PERK), and activating transcription factor 6 (ATF6). Although it is important to measure the activity of ATF6 that can indicate the status of the ER, no specific cell-based reporter assay is currently available. Here, we report a new cell-based method for monitoring ER stress based on the cleavage of ATF6α by sequential actions of proteases at the Golgi apparatus during ER stress. A new expressing vector was constructed by using fusion gene of GAL4 DNA binding domain (GAL4DBD) and activation domain derived from herpes simplex virus VP16 protein (VP16AD) followed by a human ATF6α N-terminal deletion variant. During ER stress, the GAL4DBD-VP16AD(GV)-hATF6α deletion variant was cleaved to liberate active transcription activator encompassing GV-hATF6α fragment which could translocate into the nucleus. The translocated GV-hATF6α fragment strongly induced the expression of firefly luciferase in HeLa Luciferase Reporter cell line containing a stably integrated 5X GAL4 site-luciferase gene. The established double stable reporter cell line HLR-GV-hATF6α(333) represents an innovative tool to investigate regulated intramembrane proteolysis of ATF6α. It can substitute active pATF6(N) binding motif-based reporter cell lines.
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Affiliation(s)
- Jin-Ik Kim
- Department of Biochemistry & Health Sciences, Changwon National University, Changwon 51140,
Korea
| | - Randal J. Kaufman
- Degenerative Diseases Program, Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA 92037,
USA
| | - Sung Hoon Back
- School of Biological Sciences, University of Ulsan, Ulsan 44610,
Korea
| | - Ja-Young Moon
- Department of Biochemistry & Health Sciences, Changwon National University, Changwon 51140,
Korea
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Illés P, Grycová A, Krasulová K, Dvořák Z. Effects of Flavored Nonalcoholic Beverages on Transcriptional Activities of Nuclear and Steroid Hormone Receptors: Proof of Concept for Novel Reporter Cell Line PAZ-PPARg. J Agric Food Chem 2018; 66:12066-12078. [PMID: 30394742 DOI: 10.1021/acs.jafc.8b05158] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We developed and characterized a novel human luciferase reporter cell line for the assessment of peroxisome proliferator-activated receptor γ (PPARγ) transcriptional activity, PAZ-PPARg. The luciferase activity induced by PPARγ endogenous agonist 15d-PGJ2 and prostaglandin PGD2 reached mean values of (87.9 ± 14.0)-fold and (89.6 ± 19.7)-fold after 24 h of exposure to 40 μM 15d-PGJ2 and 70 μM PGD2, respectively. A concentration-dependent inhibition of 15d-PGJ2- and PGD2-induced luciferase activity was observed after the application of T0070907, a selective antagonist of PPARγ, which confirms the specificity of response to both agonists. The PAZ-PPARg cell line, along with the reporter cell lines for the assessment of transcriptional activities of thyroid receptor (TR), vitamin D3 receptor (VDR), androgen receptor (AR), and glucocorticoid receptor (GR), were used for the screening of 27 commonly marketed flavored nonalcoholic beverages for their possible disrupting effects. Our findings indicate that some of the examined beverages have the potential to modulate the transcriptional activities of PPARγ, VDR, and AR.
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Affiliation(s)
- Peter Illés
- Regional Centre of Advanced Technologies and Materials, Faculty of Science , Palacky University , Slechtitelu 27 , 783 71 Olomouc , Czech Republic
| | - Aneta Grycová
- Regional Centre of Advanced Technologies and Materials, Faculty of Science , Palacky University , Slechtitelu 27 , 783 71 Olomouc , Czech Republic
| | - Kristýna Krasulová
- Regional Centre of Advanced Technologies and Materials, Faculty of Science , Palacky University , Slechtitelu 27 , 783 71 Olomouc , Czech Republic
| | - Zdeněk Dvořák
- Regional Centre of Advanced Technologies and Materials, Faculty of Science , Palacky University , Slechtitelu 27 , 783 71 Olomouc , Czech Republic
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9
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Kainulainen MH, Nichol ST, Albariño CG, Spiropoulou CF. Rapid Determination of Ebolavirus Infectivity in Clinical Samples Using a Novel Reporter Cell Line. J Infect Dis 2017; 216:1380-1385. [PMID: 29029133 DOI: 10.1093/infdis/jix486] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 09/18/2017] [Indexed: 11/12/2022] Open
Abstract
Modern ebolavirus diagnostics rely primarily on quantitative reverse transcription-polymerase chain reaction (qRT-PCR), a sensitive method to detect viral genetic material in the acute phase of the disease. However, qRT-PCR does not confirm presence of infectious virus, presenting limitations in patient and outbreak management. Attempts to isolate infectious virus rely on in vivo or basic cell culture approaches, which prohibit rapid results and screening. In this study, we present a novel reporter cell line capable of detecting live ebolaviruses. These cells permit sensitive, large-scale screening and titration of infectious virus in experimental and clinical samples, independent of ebolavirus species and variant.
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Affiliation(s)
- Markus H Kainulainen
- Viral Special Pathogens Branch, Division of High-Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Stuart T Nichol
- Viral Special Pathogens Branch, Division of High-Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - César G Albariño
- Viral Special Pathogens Branch, Division of High-Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, Georgia
| | - Christina F Spiropoulou
- Viral Special Pathogens Branch, Division of High-Consequence Pathogens and Pathology, Centers for Disease Control and Prevention, Atlanta, Georgia
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Luo Y, Rao M, Zou J. Generation of GFP Reporter Human Induced Pluripotent Stem Cells Using AAVS1 Safe Harbor Transcription Activator-Like Effector Nuclease. ACTA ACUST UNITED AC 2014; 29:5A.7.1-18. [PMID: 24838915 DOI: 10.1002/9780470151808.sc05a07s29] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Generation of a fluorescent GFP reporter line in human induced pluripotent stem cells (hiPSCs) provides enormous potentials in both basic stem cell research and regenerative medicine. A protocol for efficiently generating such an engineered reporter line by gene targeting is highly desired. Transcription activator-like effector nucleases (TALENs) are a new class of artificial restriction enzymes that have been shown to significantly promote homologous recombination by >1000-fold. The AAVS1 (adeno-associated virus integration site 1) locus is a "safe harbor" and has an open chromatin structure that allows insertion and stable expression of transgene. Here, we describe a step-by-step protocol from determination of TALENs activity, hiPSC culture, and delivery of a donor into AAVS1 targeting site, to validation of targeted integration by PCR and Southern blot analysis using hiPSC line, and a pair of open-source AAVS1 TALENs.
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Affiliation(s)
- Yongquan Luo
- NIH Center for Regenerative Medicine, Laboratory of Stem Cell Biology, National Institute of Arthritis, Musculoskeletal and Skin Diseases, National Institutes of Medicine, Bethesda, Maryland
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