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Mekky RY, El-Ekiaby N, El Sobky SA, Elemam NM, Youness RA, El-Sayed M, Hamza MT, Esmat G, Abdelaziz AI. Epigallocatechin gallate (EGCG) and miR-548m reduce HCV entry through repression of CD81 receptor in HCV cell models. Arch Virol 2019; 164:1587-1595. [PMID: 30949812 DOI: 10.1007/s00705-019-04232-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2018] [Accepted: 02/13/2019] [Indexed: 12/29/2022]
Abstract
Epigallocatechin gallate (EGCG) is the most abundant component in green tea extract, that has powerful antioxidant and antiviral effects. It has been previously reported to inhibit HCV entry via several mechanisms. Hence, this study aimed at further investigating the potential impact of EGCG on HCV entry through regulation of the expression of tetraspanin receptor CD81 by the novel predicted miR-548m. Liver biopsies were obtained from 29 HCV patients and 10 healthy controls for expression profiling. Huh7 cells were stimulated with EGCG and subsequently miR-548m expression was assessed. Naïve, HCV- ED43/JFH-1 and HCV-JFH-1 infected Huh7 cells were transfected by miR-548m mimics and inhibitors. Consequently, CD81 protein and mRNA levels were assessed using flow cytometry and qRT-PCR, respectively. Additionally, these cells were used to investigate HCV permissiveness into Huh7 cells using qRT-PCR for viral quantification. Direct binding confirmation of miR-548m to CD81 was done using luciferase reporter assay. In-silico analysis revealed miR-548m to have two potential binding sites in the 3'UTR of CD81 mRNA. EGCG boosted miR-548m expression in Huh7 cells. Additionally, miR-548m caused a downregulation of CD81 protein and mRNA levels as well as reduction in HCV infectivity of Huh7 cells. Luciferase binding assay confirmed the binding of miR-548m to CD81 mRNA at the two predicted binding sites. Intriguingly, miR-548m expression was not detected in healthy liver biopsies but was found in liver biopsies of HCV patients. This study shows that EGCG might act as an anti-HCV agent that reduces cellular infectivity via enhancing miR-548m expression and repressing CD81 receptor.
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Affiliation(s)
- Radwa Yehia Mekky
- Department of Pharmacology and Toxicology, German University in Cairo, Cairo, Egypt
| | - Nada El-Ekiaby
- School of Medicine, NewGiza University (NGU), NewGiza, Km 22 Cairo-Alex Road, Cairo, Egypt
| | | | - Noha Mousaad Elemam
- Sharjah Institute for Medical Research (SIMR), College of Medicine, University of Sharjah, Sharjah, United Arab Emirates
| | - Rana Ahmed Youness
- Department of Pharmaceutical Biology, German University in Cairo, Cairo, Egypt
| | - Mohammad El-Sayed
- Department of Endemic Medicine and Hepatogastroenterology, Cairo University, Cairo, Egypt
| | | | - Gamal Esmat
- Department of Endemic Medicine and Hepatogastroenterology, Cairo University, Cairo, Egypt
| | - Ahmed Ihab Abdelaziz
- School of Medicine, NewGiza University (NGU), NewGiza, Km 22 Cairo-Alex Road, Cairo, Egypt.
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Comparative analysis of microRNA and mRNA expression profiles in cells and exosomes under toluene exposure. Toxicol In Vitro 2017; 41:92-101. [DOI: 10.1016/j.tiv.2017.02.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Revised: 01/26/2017] [Accepted: 02/23/2017] [Indexed: 12/12/2022]
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Lim JH, Song MK, Cho Y, Kim W, Han SO, Ryu JC. Expression of exosomal and cellular microRNAs: as biomarkers for toluene, ethylbenzene, xylene (TEX) exposure. Mol Cell Toxicol 2017. [DOI: 10.1007/s13273-016-0040-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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Epigallocatechin-3-Gallate Upregulates miR-221 to Inhibit Osteopontin-Dependent Hepatic Fibrosis. PLoS One 2016; 11:e0167435. [PMID: 27935974 PMCID: PMC5147893 DOI: 10.1371/journal.pone.0167435] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Accepted: 11/14/2016] [Indexed: 02/06/2023] Open
Abstract
Osteopontin (OPN) promotes hepatic fibrosis, and developing therapies targeting OPN expression in settings of hepatic injury holds promise. The polyphenol epigallocatechin-3-gallate (EGCG), found in high concentrations in green tea, downregulates OPN expression through OPN mRNA degradation, but the mechanism is unknown. Previous work has shown that microRNAs can decrease OPN mRNA levels, and other studies have shown that EGCG modulates the expression of multiple microRNAs. In our study, we first demonstrated that OPN induces hepatic stellate cells to transform into an activated state. We then identified three microRNAs which target OPN mRNA: miR-181a, miR-10b, and miR-221. In vitro results show that EGCG upregulates all three microRNAs, and all three microRNAs are capable of down regulating OPN mRNA when administered alone. Interestingly, only miR-221 is necessary for EGCG-mediated OPN mRNA degradation and miR-221 inhibition reduces the effects of EGCG on cell function. In vivo experiments show that thioacetamide (TAA)-induced cell cytotoxicity upregulates OPN expression; treatment with EGCG blocks the effects of TAA. Furthermore, chronic treatment of EGCG in vivo upregulates all three microRNAs equally, suggesting that in more chronic treatment all three microRNAs are involved in modulating OPN expression. We conclude that in in vitro and in vivo models of TAA-induced hepatic fibrosis, EGCG inhibits OPN-dependent injury and fibrosis. EGCG works primarily by upregulating miR-221 to accelerate OPN degradation. EGCG may therefore have utility as a protective agent in settings of liver injury.
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Nair S, Kong ANT. Architecture of Signature miRNA Regulatory Networks in Cancer Chemoprevention. ACTA ACUST UNITED AC 2015. [DOI: 10.1007/s40495-014-0014-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Bai Y, Xue Y, Xie X, Yu T, Zhu Y, Ge Q, Lu Z. The RNA expression signature of the HepG2 cell line as determined by the integrated analysis of miRNA and mRNA expression profiles. Gene 2014; 548:91-100. [PMID: 25014136 DOI: 10.1016/j.gene.2014.07.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Revised: 06/19/2014] [Accepted: 07/07/2014] [Indexed: 12/15/2022]
Abstract
Understanding miRNAs' regulatory networks and target genes could facilitate the development of therapies for human diseases such as cancer. Although much useful gene expression profiling data for tumor cell lines is available, microarray data for miRNAs and mRNAs in the human HepG2 cell line have only been compared with that of other cell lines separately. The relationship between miRNAs and mRNAs in integrated expression profiles for HepG2 cells is still unknown. To explore the miRNA-mRNA correlations in hepatocellular carcinoma (HCC) cells, we performed miRNA and mRNA expression profiling in HepG2 cells and normal liver HL-7702 cells at the genome scale using next-generation sequencing technology. We identified 193 miRNAs that are differentially expressed in these two cell lines. Of these, 89 miRNAs were down-regulated in HepG2 cells compared with HL-7702 cells, while 104 miRNAs were up-regulated. We also observed 3035 mRNAs that are significantly dys-regulated in HepG2 cells. We then performed an integrated analysis of the expression data for differentially expressed miRNAs and mRNAs and found several miRNA-mRNA pairs that are significantly correlated in HepG2 cells. Further analysis suggested that these differentially expressed genes were enriched in four tumorigenesis-related signaling pathways, namely, ErbB, JAK-STAT, mTOR, and WNT, which until now had not been fully reported. Our results could be helpful in understanding the mechanisms of HCC occurrence and development.
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Affiliation(s)
- Yunfei Bai
- School of Biological Sciences and Medical Engineering, Southeast University, Nanjing 210096, China.
| | - Ying Xue
- School of Biological Sciences and Medical Engineering, Southeast University, Nanjing 210096, China
| | - Xueying Xie
- Research Center for Learning Science, Southeast University, Nanjing 210096, China
| | - Tong Yu
- Nanjing Decode Genomics Biotechnology Co., Ltd., Nanjing 210019, China
| | - Yihua Zhu
- School of Biological Sciences and Medical Engineering, Southeast University, Nanjing 210096, China; College of Information Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
| | - Qinyu Ge
- Research Center for Learning Science, Southeast University, Nanjing 210096, China
| | - Zuhong Lu
- School of Biological Sciences and Medical Engineering, Southeast University, Nanjing 210096, China; Research Center for Learning Science, Southeast University, Nanjing 210096, China.
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Bhullar KS, Rupasinghe HPV. Polyphenols: multipotent therapeutic agents in neurodegenerative diseases. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2013; 2013:891748. [PMID: 23840922 PMCID: PMC3690243 DOI: 10.1155/2013/891748] [Citation(s) in RCA: 211] [Impact Index Per Article: 19.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/10/2013] [Accepted: 04/29/2013] [Indexed: 12/19/2022]
Abstract
Aging leads to numerous transitions in brain physiology including synaptic dysfunction and disturbances in cognition and memory. With a few clinically relevant drugs, a substantial portion of aging population at risk for age-related neurodegenerative disorders require nutritional intervention. Dietary intake of polyphenols is known to attenuate oxidative stress and reduce the risk for related neurodegenerative diseases such as Alzheimer's disease (AD), stroke, multiple sclerosis (MS), Parkinson's disease (PD), and Huntington's disease (HD). Polyphenols exhibit strong potential to address the etiology of neurological disorders as they attenuate their complex physiology by modulating several therapeutic targets at once. Firstly, we review the advances in the therapeutic role of polyphenols in cell and animal models of AD, PD, MS, and HD and activation of drug targets for controlling pathological manifestations. Secondly, we present principle pathways in which polyphenol intake translates into therapeutic outcomes. In particular, signaling pathways like PPAR, Nrf2, STAT, HIF, and MAPK along with modulation of immune response by polyphenols are discussed. Although current polyphenol researches have limited impact on clinical practice, they have strong evidence and testable hypothesis to contribute clinical advances and drug discovery towards age-related neurological disorders.
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Affiliation(s)
- Khushwant S. Bhullar
- Department of Environmental Sciences, Faculty of Agriculture, Dalhousie University, Truro, NS, Canada B2N 5E3
| | - H. P. Vasantha Rupasinghe
- Department of Environmental Sciences, Faculty of Agriculture, Dalhousie University, Truro, NS, Canada B2N 5E3
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Karius T, Schnekenburger M, Dicato M, Diederich M. MicroRNAs in cancer management and their modulation by dietary agents. Biochem Pharmacol 2012; 83:1591-601. [PMID: 22342289 DOI: 10.1016/j.bcp.2012.02.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2011] [Revised: 01/11/2012] [Accepted: 02/01/2012] [Indexed: 12/16/2022]
Abstract
MicroRNAs (miRNAs) represent a class of small (21-23 nucleotides) non-coding RNAs that emerged as key post-transcriptional gene regulators, implicated in numerous physiological and pathological processes. Currently, a main focus of miRNA research is related to the roles of miRNAs in cancer development. The biogenesis and modes of action of miRNAs have not been completely elucidated; however, miRNA-mediated translational repression is involved in the regulation of almost every cellular process. Thus, pathological alterations in miRNA expression signatures are commonly associated with disease development. This review specifically focuses on miRNAs in cancer, with an emphasis on their use as potential biomarkers for cancer diagnosis and prognosis. Then, we discuss the potential use of synthetic antisense or miRNA mimetic oligonucleotides and dietary agents to modulate miRNA expression for chemotherapy and chemoprevention of cancer, respectively.
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Affiliation(s)
- Tommy Karius
- Laboratoire de Biologie Moléculaire et Cellulaire de Cancer, Hôpital Kirchberg, 9, rue Edward Steichen, L-2540 Luxembourg, Luxembourg
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Jeong SW, Seo YR. Transcriptomic analysis of Caenorhabditis elegans exposed to nickel (II) acetate using microarray. BIOCHIP JOURNAL 2011. [DOI: 10.1007/s13206-011-5112-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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