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Kim HS, Moon HJ, Choi JB, Han BK, Woo SD. Efficient Production of Enterovirus 71 (EV71) Virus-like Particles by Controlling Promoter Strength in Insect Cells. Viruses 2024; 16:834. [PMID: 38932128 PMCID: PMC11209064 DOI: 10.3390/v16060834] [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: 04/21/2024] [Revised: 05/19/2024] [Accepted: 05/22/2024] [Indexed: 06/28/2024] Open
Abstract
This study was conducted to efficiently produce virus-like particles (VLPs) of enterovirus 71 (EV71), a causative virus of hand, foot, and mouth disease (HFMD). The expression level of the P1 precursor, a structural protein of EV71, was modified to increase VLP production, and the optimal expression level and duration of the 3CD protein for P1 cleavage were determined. The expression level and duration of 3CD were controlled by the p10 promoter, which was weakened by repeated burst sequence (BS) applications, as well as the OpIE2 promoter, which was weakened by the insertion of random untranslated region sequences of various lengths. The cleavage and production efficiency of the P1 precursor were compared based on the expression time and level of 3CD, revealing that the p10-BS5 promoter with four repeated BSs was the most effective. When P1 and 3CD were expressed using the hyperexpression vector and the p10-BS5 promoter, high levels of structural protein production and normal HFMD-VLP formation were observed, respectively. This study suggests that the production efficiency of HFMD-VLPs can be significantly enhanced by increasing the expression of the P1 precursor and controlling the amount and duration of 3CD expression.
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Affiliation(s)
- Hyun-Soo Kim
- Department of Agricultural Biology, College of Agriculture, Life & Environment Science, Chungbuk National University, Cheongju 28644, Republic of Korea; (H.-S.K.); (H.-J.M.)
| | - Hyuk-Jin Moon
- Department of Agricultural Biology, College of Agriculture, Life & Environment Science, Chungbuk National University, Cheongju 28644, Republic of Korea; (H.-S.K.); (H.-J.M.)
| | - Jae-Bang Choi
- Optipharm Inc., Osong 28158, Republic of Korea; (J.-B.C.); (B.-K.H.)
| | - Beom-Ku Han
- Optipharm Inc., Osong 28158, Republic of Korea; (J.-B.C.); (B.-K.H.)
| | - Soo Dong Woo
- Department of Agricultural Biology, College of Agriculture, Life & Environment Science, Chungbuk National University, Cheongju 28644, Republic of Korea; (H.-S.K.); (H.-J.M.)
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2
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Aladdin A, Sahly N, Faty R, Youssef MM, Salem TZ. The baculovirus promoter OpIE2 sequence has inhibitory effect on the activity of the cytomegalovirus (CMV) promoter in HeLa and HEK-293 T cells. Gene 2021; 781:145541. [PMID: 33667607 DOI: 10.1016/j.gene.2021.145541] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 01/22/2021] [Accepted: 02/17/2021] [Indexed: 10/22/2022]
Abstract
Understanding how promoters work in non-host cells is complex. Nonetheless, understanding this process is crucial while performing gene expression modulation studies. This study began with the process of constructing a shuttle vector with CMV and OpIE2 promoters in a tandem arrangement to achieve gene expression in both mammalian and insect cells, respectively. In this system, inhibitory regions in the 5' end of the OpIE2 insect viral promoter were found to be blocking the activity of the CMV promoter in mammalian cells. Initially, the OpIE2 promoter was cloned downstream of the CMV promoter and upstream of the EGFP reporter gene. After introducing the constructed shuttle vector to insect and mammalian cells, a significant drop in the CMV promoter activity in mammalian cells was observed. To enhance the CMV promoter activity, several modifications were made to the shuttle vector including site-directed mutagenesis to remove all ATG codons from the downstream promoter (OpIE2), separating the two promoters to eliminate the effect of transcription interference between them, and finally, identifying some inhibitory regions in the OpIE2 promoter sequence. When these inhibitory regions were removed, high expression levels in insect and mammalian cells were maintained. In conclusion, a shuttle vector was constructed that works efficiently in both mammalian and insect cell lines in the absence of baculovirus infection or gene expression. Moreover, the shuttle vector can be used as a platform to further study the reason for this inhibition, which may give new insights about transcription and promoters' mode of action in both insect and mammalian hosts.
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Affiliation(s)
- A Aladdin
- Biomedical Sciences Program, University of Science and Technology, Zewail City of Science and Technology, October Gardens, 6th of October City, Giza 12578, Egypt
| | - N Sahly
- Biomedical Sciences Program, University of Science and Technology, Zewail City of Science and Technology, October Gardens, 6th of October City, Giza 12578, Egypt
| | - R Faty
- Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt
| | - M M Youssef
- Department of Chemistry, Faculty of Science, Cairo University, Giza 12613, Egypt
| | - T Z Salem
- Biomedical Sciences Program, University of Science and Technology, Zewail City of Science and Technology, October Gardens, 6th of October City, Giza 12578, Egypt; Department of Molecular Genetics, AGERI, ARC, Giza 12619, Egypt; National Biotechnology Network of Expertise (NBNE), Academy of Science Research and Technology (ASRT), 11334 Cairo, Egypt.
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3
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Genetic code expansion in mammalian cells: A plasmid system comparison. Bioorg Med Chem 2020; 28:115772. [PMID: 33069552 DOI: 10.1016/j.bmc.2020.115772] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Revised: 09/09/2020] [Accepted: 09/10/2020] [Indexed: 12/22/2022]
Abstract
Genetic code expansion with unnatural amino acids (UAAs) has significantly broadened the chemical repertoire of proteins. Applications of this method in mammalian cells include probing of molecular interactions, conditional control of biological processes, and new strategies for therapeutics and vaccines. A number of methods have been developed for transient UAA mutagenesis in mammalian cells, each with unique features and advantages. All have in common a need to deliver genes encoding additional protein biosynthetic machinery (an orthogonal tRNA/tRNA synthetase pair) and a gene for the protein of interest. In this study, we present a comparative evaluation of select plasmid-based genetic code expansion systems and a detailed analysis of suppression efficiency with different UAAs and in different cell lines.
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Chalertpet K, Pin-On P, Aporntewan C, Patchsung M, Ingrungruanglert P, Israsena N, Mutirangura A. Argonaute 4 as an Effector Protein in RNA-Directed DNA Methylation in Human Cells. Front Genet 2019; 10:645. [PMID: 31333722 PMCID: PMC6620710 DOI: 10.3389/fgene.2019.00645] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Accepted: 06/18/2019] [Indexed: 01/06/2023] Open
Abstract
DNA methylation of specific genome locations contributes to the distinct functions of multicellular organisms. DNA methylation can be governed by RNA-dependent DNA methylation (RdDM). RdDM is carried out by endogenous small-RNA-guided epigenomic editing complexes that add a methyl group to a precise DNA location. In plants, the Argonaute 4 (AGO4) protein is one of the main catalytic components involved in RdDM. Although small interfering RNA or short hairpin RNA has been shown to be able to guide DNA methylation in human cells, AGO protein-regulated RdDM in humans has not yet been evaluated. This study aimed to identify a key regulatory AGO protein involved in human RdDM by bioinformatics and to explore its function in RdDM by a combination of AGO4 knockdown, Alu small interfering RNA transfection, AGO4-expressing plasmid transfection, chromatin immunoprecipitation, cell-penetrating peptide-tagged AGO4 combined Alu single-guide RNA transfection, and methylation analyses. We found that first, human AGO4 showed stronger genome-wide association with DNA methylation than AGO1–AGO3. Second, endogenous AGO4 depletion demethylated DNA of known AGO4 bound loci. Finally, exogenous AGO4 de novo methylated the bound DNA sequences. Therefore, we discovered that AGO4 plays a role in human RdDM.
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Affiliation(s)
- Kanwalat Chalertpet
- Interdisciplinary Program of Biomedical Sciences, Faculty of the Graduate School, Chulalongkorn University, Bangkok, Thailand
| | - Piyapat Pin-On
- Interdisciplinary Program of Biomedical Sciences, Faculty of the Graduate School, Chulalongkorn University, Bangkok, Thailand.,Faculty of Medicine, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand
| | - Chatchawit Aporntewan
- Department of Mathematics and Computer Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Maturada Patchsung
- Interdisciplinary Program of Biomedical Sciences, Faculty of the Graduate School, Chulalongkorn University, Bangkok, Thailand.,Center of Excellence in Molecular Genetics of Cancer and Human Diseases, Department of Anatomy, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Praewphan Ingrungruanglert
- Stem Cells and Cell Therapy Research Unit, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Nipan Israsena
- Stem Cells and Cell Therapy Research Unit, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
| | - Apiwat Mutirangura
- Center of Excellence in Molecular Genetics of Cancer and Human Diseases, Department of Anatomy, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.,Department of Anatomy, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
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Ramazi S, Heydari-Zarnagh H, Goudarzian M, Khalaj-Kondori M, Bonyadi M. Thromboxane A synthase 1 gene expression and promotor haplotypes are associated with risk of large artery-atherosclerosis stroke in Iranian population. J Cell Biochem 2019; 120:15222-15232. [PMID: 31026093 DOI: 10.1002/jcb.28787] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 01/01/2019] [Accepted: 01/07/2019] [Indexed: 12/16/2022]
Abstract
Large artery atherosclerosis (LAA) is known as an important cause of ischemic stroke (IS), which is a multifactorial disorder. Many candidate genes have been proposed for IS like (TBXAS1) that plays a significant role in LAA stroke pathogenesis. This is the first study on the evaluation of the association of the five single-nucleotide polymorphisms (SNPs) in TBXAS1 promoter region and the level of TBXAS1 transcript with large-artery atherosclerosis stroke. Five SNPs in TBXAS1 genes were investigated in 248 patients with large-artery atherosclerosis stroke and 199 healthy controls in Iranian population in this case-control study through using the high-resolution melting assay. In addition, the relationships between the selected SNPs with alteration of TBXAS1 gene expressions were investigated in terms of blood platelets through the reverse transcription-quantitative polymerase chain reaction. Multivariate logistic analysis with adjustments indicated that rs10256282CC, rs10237429CC, and rs4590360GG genotypes were associated with large-artery atherosclerosis stroke (adjusted odds ratio = 2.804, 2.872, and 2.432, respectively; P < 0.05, q < 0.05). Furthermore, the frequency of CACCG haplotype in the patients was greatly higher than that in the controls (OR = 1.424, 95% CI: 1.071-1.893, P = 0.014738). In addition, TBXAS1 expression was higher in patients compared to the controls (P = 0.021), and individuals with the homozygous mutated genotypes of these SNPs showed a higher expression level compared to other genotype (P < 0.05). In total, our findings indicate a significant association of TBXAS1 gene rs10256282CC, rs10237429CC, and rs4590360GG polymorphisms with large-artery atherosclerosis stroke susceptibility and the level of TBXAS1 expression, which was not previously reported in any population.
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Affiliation(s)
- Shahin Ramazi
- Department of Animal Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
| | - Hafez Heydari-Zarnagh
- Cellular and Molecular Research Center, Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Maryam Goudarzian
- Iranian Research Center on Healthy Aging (IRCHA), Sabzevar University of Medical Sciences, Sabzevar, Iran
| | - Mohammad Khalaj-Kondori
- Department of Animal Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
| | - Mortaza Bonyadi
- Department of Animal Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran
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Lai WS, Arvola RM, Goldstrohm AC, Blackshear PJ. Inhibiting transcription in cultured metazoan cells with actinomycin D to monitor mRNA turnover. Methods 2019; 155:77-87. [PMID: 30625384 DOI: 10.1016/j.ymeth.2019.01.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 01/02/2019] [Accepted: 01/04/2019] [Indexed: 12/11/2022] Open
Abstract
Decay of transcribed mRNA is a key determinant of steady state mRNA levels in cells. Global analysis of mRNA decay in cultured cells has revealed amazing heterogeneity in rates of decay under normal growth conditions, with calculated half-lives ranging from several minutes to many days. The factors that are responsible for this wide range of decay rates are largely unknown, although our knowledge of trans-acting RNA binding proteins and non-coding RNAs that can control decay rates is increasing. Many methods have been used to try to determine mRNA decay rates under various experimental conditions in cultured cells, and transcription inhibitors like actinomycin D have probably the longest history of any technique for this purpose. Despite this long history of use, the actinomycin D method has been criticized as prone to artifacts, and as ineffective for some promoters. With appropriate guidelines and controls, however, it can be a versatile, effective technique for measuring endogenous mRNA decay in cultured mammalian and insect cells, as well as the decay of exogenously-expressed transcripts. It can be used readily on a genome-wide level, and is remarkably cost-effective. In this short review, we will discuss our utilization of this approach in these cells; we hope that these methods will allow more investigators to apply this useful technique to study mRNA decay under the appropriate conditions.
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Affiliation(s)
- Wi S Lai
- The Signal Transduction Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, United States
| | - Rene M Arvola
- The Department of Biological Chemistry, University of Michigan, Ann Arbor, MI, United States
| | - Aaron C Goldstrohm
- The Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, MN, United States
| | - Perry J Blackshear
- The Signal Transduction Laboratory, National Institute of Environmental Health Sciences, Research Triangle Park, NC 27709, United States; The Departments of Medicine and Biochemistry, Duke University School of Medicine, Durham, NC 27710, United States.
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Hojo N, Huisken AL, Wang H, Chirshev E, Kim NS, Nguyen SM, Campos H, Glackin CA, Ioffe YJ, Unternaehrer JJ. Snail knockdown reverses stemness and inhibits tumour growth in ovarian cancer. Sci Rep 2018; 8:8704. [PMID: 29880891 PMCID: PMC5992154 DOI: 10.1038/s41598-018-27021-z] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Accepted: 05/23/2018] [Indexed: 12/29/2022] Open
Abstract
To develop effective therapies for advanced high grade serous ovarian cancer (HGSOC), understanding mechanisms of recurrence and metastasis is necessary. In this study, we define the epithelial/mesenchymal status of cell lines that accurately model HGSOC, and evaluate the therapeutic potential of targeting Snai1 (Snail), a master regulator of the epithelial/mesenchymal transition (EMT) in vitro and in vivo. The ratio of Snail to E-cadherin (S/E index) at RNA and protein levels was correlated with mesenchymal morphology in four cell lines. The cell lines with high S/E index (OVCAR8 and COV318) showed more CSC-like, motile, and chemoresistant phenotypes than those with low S/E index (OVSAHO and Kuramochi). We tested the role of Snail in regulation of malignant phenotypes including stemness, cell motility, and chemotherapy resistance: shRNA-mediated knockdown of Snail reversed these malignant phenotypes. Interestingly, the expression of let-7 tumour suppressor miRNA was upregulated in Snail knockdown cells. Furthermore, knockdown of Snail decreased tumour burden in an orthotopic xenograft mouse model. We conclude that Snail is important in controlling HGSOC malignant phenotypes and suggest that the Snail/Let-7 axis may be an attractive target for HGSOC treatment.
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Affiliation(s)
- N Hojo
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA, USA
| | - A L Huisken
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA, USA
| | - H Wang
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA, USA
| | - E Chirshev
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA, USA
| | - N S Kim
- Department of Molecular Biology, Chonbuk National University, Dukjindong 664-14, Jeonju, Jeollabuk-do, 561-756, Republic of Korea
| | - S M Nguyen
- University of California, Riverside - School of Medicine, Riverside, CA, USA
| | - H Campos
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA, USA.,Center for Health Disparities and Molecular Medicine, Loma Linda University, Loma Linda, CA, USA
| | - C A Glackin
- Beckman Research Institute, City of Hope, Duarte, CA, USA
| | - Y J Ioffe
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Loma Linda University Medical Center, Loma Linda, CA, USA
| | - J J Unternaehrer
- Division of Biochemistry, Department of Basic Sciences, Loma Linda University, Loma Linda, CA, USA.
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