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Klicka K, Grzywa TM, Mielniczuk A, Klinke A, Włodarski PK. The role of miR-200 family in the regulation of hallmarks of cancer. Front Oncol 2022; 12:965231. [PMID: 36158660 PMCID: PMC9492973 DOI: 10.3389/fonc.2022.965231] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 08/04/2022] [Indexed: 11/16/2022] Open
Abstract
MiRNAs are short non-coding RNAs that regulate gene expression post-transcriptionally contributing to the development of different diseases including cancer. The miR-200 family consists of five members, miR-200a, miR-200b, miR-200c, miR-141, and miR-429. Their expression is dysregulated in cancer tissue and their level is altered in the body fluids of cancer patients. Moreover, the levels of miR-200 family members correlate with clinical parameters such as cancer patients' survival which makes them potentially useful as diagnostic and prognostic biomarkers. MiRNAs can act as either oncomiRs or tumor suppressor miRNAs depending on the target genes and their role in the regulation of key oncogenic signaling pathways. In most types of cancer, the miR-200 family acts as tumor suppressor miRNA and regulates all features of cancer. In this review, we summarized the expression pattern of the miR-200 family in different types of cancer and their potential utility as biomarkers. Moreover, we comprehensively described the role of miR-200 family members in the regulation of all hallmarks of cancer proposed by Hanahan and Weinberg with the focus on the epithelial-mesenchymal transition, invasiveness, and metastasis of tumor cells.
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Affiliation(s)
- Klaudia Klicka
- Department of Methodology, Medical University of Warsaw, Warsaw, Poland
- Doctoral School, Medical University of Warsaw, Warsaw, Poland
| | - Tomasz M. Grzywa
- Department of Methodology, Medical University of Warsaw, Warsaw, Poland
- Department of Immunology, Medical University of Warsaw, Warsaw, Poland
- Laboratory of Experimental Medicine, Medical University of Warsaw, Warsaw, Poland
| | | | - Alicja Klinke
- Department of Methodology, Medical University of Warsaw, Warsaw, Poland
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Cañas JA, Núñez R, Cruz-Amaya A, Gómez F, Torres MJ, Palomares F, Mayorga C. Epigenetics in Food Allergy and Immunomodulation. Nutrients 2021; 13:4345. [PMID: 34959895 PMCID: PMC8708211 DOI: 10.3390/nu13124345] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 11/27/2021] [Accepted: 11/29/2021] [Indexed: 12/30/2022] Open
Abstract
Food allergy (FA) is an increasing problem worldwide and, over recent years, its prevalence is rising in developed countries. Nowadays, the immunological and cellular processes that occur in the allergic reactions are not fully understood, which hampers the development of in vitro diagnostic tools and further treatment options. Moreover, allergic diseases could be reinforced by environmental exposure and genetic modifications. Gene expression can be controlled by different epigenetic mechanisms like DNA methylation, histone modifications, and microRNAs. In addition, several environmental factors such as dietary components (vitamin D, butyrate, folic acid) are able to regulate this epigenetic mechanism. All these factors produce modifications in immune genes that could alter the development and function of immune cells, and therefore the etiology of the disease. Furthermore, these epigenetic mechanisms have also an influence on immunomodulation, which could explain sustained responsiveness or unresponsiveness during immunotherapy due to epigenetic modifications in key genes that induce tolerance in several FA. Thus, in this review we focus on the different epigenetic mechanisms that occur in FA and on the influence of several dietary components in these gene modifications.
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Affiliation(s)
- José A. Cañas
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga-IBIMA, 29009 Málaga, Spain; (J.A.C.); (R.N.); (A.C.-A.); (F.P.)
- Andalusian Centre for Nanomedicine and Biotechnology-BIONAND, 29590 Málaga, Spain;
| | - Rafael Núñez
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga-IBIMA, 29009 Málaga, Spain; (J.A.C.); (R.N.); (A.C.-A.); (F.P.)
| | - Anyith Cruz-Amaya
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga-IBIMA, 29009 Málaga, Spain; (J.A.C.); (R.N.); (A.C.-A.); (F.P.)
- Andalusian Centre for Nanomedicine and Biotechnology-BIONAND, 29590 Málaga, Spain;
| | - Francisca Gómez
- Allergy Clinical Unit, Hospital Regional Universitario de Málaga, 29009 Málaga, Spain;
| | - María J. Torres
- Andalusian Centre for Nanomedicine and Biotechnology-BIONAND, 29590 Málaga, Spain;
- Allergy Clinical Unit, Hospital Regional Universitario de Málaga, 29009 Málaga, Spain;
- Medicine Department, Universidad de Málaga-UMA, 29010 Málaga, Spain
| | - Francisca Palomares
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga-IBIMA, 29009 Málaga, Spain; (J.A.C.); (R.N.); (A.C.-A.); (F.P.)
| | - Cristobalina Mayorga
- Allergy Research Group, Instituto de Investigación Biomédica de Málaga-IBIMA, 29009 Málaga, Spain; (J.A.C.); (R.N.); (A.C.-A.); (F.P.)
- Andalusian Centre for Nanomedicine and Biotechnology-BIONAND, 29590 Málaga, Spain;
- Allergy Clinical Unit, Hospital Regional Universitario de Málaga, 29009 Málaga, Spain;
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miRNA-27a Transcription Activated by c-Fos Regulates Myocardial Ischemia-Reperfusion Injury by Targeting ATAD3a. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2021; 2021:2514947. [PMID: 34413925 PMCID: PMC8369174 DOI: 10.1155/2021/2514947] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 07/27/2021] [Indexed: 11/29/2022]
Abstract
MicroRNA-27a (miR-27a) has been implicated in myocardial ischemia-reperfusion injury (MIRI), but the underlying mechanism is not well understood. This study is aimed at determining the role of miR-27a in MIRI and at investigating upstream molecules that regulate miR-27a expression and its downstream target genes. miR-27a expression was significantly upregulated in myocardia exposed to ischemia/reperfusion (I/R) and cardiomyocytes exposed to hypoxia/reoxygenation (H/R). c-Fos could regulate miR-27a expression by binding to its promoter region. Moreover, overexpression of miR-27a led to a decrease in cell viability, an increase in LDH and CK-MB secretion, and an increase in apoptosis rates. In contrast, suppression of miR-27a expression resulted in the opposite effects. ATPase family AAA-domain-containing protein 3A (ATAD3a) was identified as a target of miR-27a. miR-27a regulated the translocation of apoptosis-inducing factor (AIF) from the mitochondria to the nucleus and H/R-induced apoptosis via the regulation of ATAD3a. It was found that inhibiting miR-27a in vivo by injecting a miR-27a sponge could ameliorate MIRI in an isolated rat heart model. In conclusion, our study demonstrated that c-Fos functions as an upstream regulator of miR-27a and that miR-27a regulates the translocation of AIF from the mitochondria to the nucleus by targeting ATAD3a, thereby contributing to MIRI. These findings provide new insight into the role of the c-Fos/miR-27a/ATAD3a axis in MIRI.
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Yin L, Keeler GD, Zhang Y, Hoffman BE, Ling C, Qing K, Srivastava A. AAV3-miRNA vectors for growth suppression of human hepatocellular carcinoma cells in vitro and human liver tumors in a murine xenograft model in vivo. Gene Ther 2021; 28:422-434. [PMID: 32152434 PMCID: PMC7784898 DOI: 10.1038/s41434-020-0140-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Revised: 02/26/2020] [Accepted: 02/27/2020] [Indexed: 12/24/2022]
Abstract
We have previously reported that recombinant adeno-associated virus serotype 3 (AAV3) vectors transduce human liver tumors more efficiently in a mouse xenograft model following systemic administration. Others have utilized AAV8 vectors expressing miR-26a and miR-122 to achieve near total inhibition of growth of mouse liver tumors. Since AAV3 vectors transduce human hepatic cells more efficiently than AAV8 vectors, in the present studies, we wished to evaluate the efficacy of AAV3-miR-26a/122 vectors in suppressing the growth of human hepatocellular carcinoma (HCC) cells in vitro, and human liver tumors in a mouse model in vivo. To this end, a human HCC cell line, Huh7, was transduced with various multiplicities of infection (MOIs) of AAV3-miR-26a or scAAV3-miR-122 vectors, or both, which also co-expressed a Gaussia luciferase (GLuc) reporter gene. Only a modest level of dose-dependent growth inhibition of Huh7 cells (~12-13%) was observed at the highest MOI (1 × 105 vgs/cell) with each vector. When Huh7 cells were co-transduced with both vectors, the extent of growth inhibition was additive (~26%). However, AAV3-miR-26a and scAAV3-miR-122 vectors led to ~70% inhibition of growth of Huh-derived human liver tumors in a mouse xenograft model in vivo. Thus, the combined use of miR-26a and scAAV3-miR-122 delivered by AAV3 vectors offers a potentially useful approach to target human liver tumors.
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Affiliation(s)
- Ling Yin
- State Key Laboratory of Genetic Engineering, School of Life Sciences, Zhongshan Hospital, Fudan University, Shanghai, China
- Division of Cellular and Molecular Therapy, Department of Pediatrics, University of Florida College of Medicine, Gainesville, FL, USA
- Powell Gene Therapy Center, University of Florida College of Medicine, Gainesville, FL, USA
| | - Geoffrey D Keeler
- Division of Cellular and Molecular Therapy, Department of Pediatrics, University of Florida College of Medicine, Gainesville, FL, USA
- Powell Gene Therapy Center, University of Florida College of Medicine, Gainesville, FL, USA
| | - Yuanhui Zhang
- State Key Laboratory of Genetic Engineering, School of Life Sciences, Zhongshan Hospital, Fudan University, Shanghai, China
- Division of Cellular and Molecular Therapy, Department of Pediatrics, University of Florida College of Medicine, Gainesville, FL, USA
- Powell Gene Therapy Center, University of Florida College of Medicine, Gainesville, FL, USA
- Department of Oncology, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Brad E Hoffman
- Division of Cellular and Molecular Therapy, Department of Pediatrics, University of Florida College of Medicine, Gainesville, FL, USA
- Powell Gene Therapy Center, University of Florida College of Medicine, Gainesville, FL, USA
| | - Chen Ling
- State Key Laboratory of Genetic Engineering, School of Life Sciences, Zhongshan Hospital, Fudan University, Shanghai, China.
- Division of Cellular and Molecular Therapy, Department of Pediatrics, University of Florida College of Medicine, Gainesville, FL, USA.
- Powell Gene Therapy Center, University of Florida College of Medicine, Gainesville, FL, USA.
- Department of Molecular Genetics & Microbiology, University of Florida College of Medicine, Gainesville, FL, USA.
| | - Keyun Qing
- Division of Cellular and Molecular Therapy, Department of Pediatrics, University of Florida College of Medicine, Gainesville, FL, USA
- Powell Gene Therapy Center, University of Florida College of Medicine, Gainesville, FL, USA
| | - Arun Srivastava
- Division of Cellular and Molecular Therapy, Department of Pediatrics, University of Florida College of Medicine, Gainesville, FL, USA.
- Powell Gene Therapy Center, University of Florida College of Medicine, Gainesville, FL, USA.
- Department of Molecular Genetics & Microbiology, University of Florida College of Medicine, Gainesville, FL, USA.
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Rizkita LD, Astuti I. The potential of miRNA-based therapeutics in severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection: A review. J Pharm Anal 2021; 11:265-271. [PMID: 33782640 PMCID: PMC7989072 DOI: 10.1016/j.jpha.2021.03.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 03/12/2021] [Accepted: 03/16/2021] [Indexed: 12/12/2022] Open
Abstract
Since the World Health Organization (WHO) declared COVID-19, the disease caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), as a pandemic in March 2020, and more than 117 million people worldwide have been confirmed to have been infected. Scientists, medical professionals, and other stakeholders are racing against time to find and develop effective medicines for COVID-19. However, no drug with high efficacy to treat SARS-CoV-2 infection has been approved. With the increasing popularity of gene therapy, scientists have explored the utilization of small RNAs such as microRNAs (miRNAs) as therapeutics. miRNAs are non-coding RNAs with high affinity for the 3'-UTRs of targeted messenger RNAs (mRNAs). Interactions between host cells and viral genomes may induce the upregulation or downregulation of various miRNAs. Therefore, understanding the expression patterns of these miRNAs and their functions will provide insights into potential miRNA-based therapies. This review systematically summarizes the potential targets of miRNA-based therapies for SARS-CoV-2 infection and examines the viability of possible transfection methods.
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Affiliation(s)
- Leonny Dwi Rizkita
- Department of Pharmacology and Therapy, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Yogyakarta, 55281, Indonesia
| | - Indwiani Astuti
- Department of Pharmacology and Therapy, Faculty of Medicine, Public Health and Nursing, Universitas Gadjah Mada, Yogyakarta, 55281, Indonesia
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Zhou J, Li Z, Huang Y, Ju W, Wang D, Zhu X, He X. MicroRNA-26a targets the mdm2/p53 loop directly in response to liver regeneration. Int J Mol Med 2019; 44:1505-1514. [PMID: 31364731 DOI: 10.3892/ijmm.2019.4282] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Accepted: 05/07/2019] [Indexed: 11/06/2022] Open
Abstract
Liver regeneration (LR) is the result of a dynamic balance between the increased proliferation and decreased apoptosis of hepatocytes. However, the role of microRNA (miR)‑26a in regulating complex signalling networks involving E3 ubiquitin‑protein ligase Mdm2 (mdm2), p53, p21 and p27 in the process of LR is currently unclear. In the present study, it was hypothesized that miR‑26a may negatively regulate the mdm2/p53 signalling loop in response to LR. In vitro experiments were performed, whereby mouse liver cells were transfected with an miR‑26a vector or an anti/miR‑26a vector. Cell proliferation was analysed using an MTS assay and cell apoptosis, and cell cycle progression were analysed by flow cytometry. In addition, the expression of mdm2, p53, p21 and p27 were assessed using western blotting and reverse transcription‑quantitative polymerase chain reaction analyses. Dual‑luciferase reporter assays were also used to examine the association between mdm2 and miR‑26a. A 70% partial hepatectomy in C57BL/6J mice was then performed, which was followed by injection with an mdm2‑cDNA vector or an mdm2‑small interfering RNA vector. The liver‑to‑body weight ratio and liver function of mice were measured at 72 h following vector administration. The results demonstrated an increase in hepatocyte proliferation accompanied by decreased hepatocyte apoptosis levels. In addition, inhibition of miR‑26a expression was associated with a marked increase in mdm2 expression, while the expression of p53, p21 and p27 was decreased when compared with negative controls. The opposite effects were observed when miR‑26a was overexpressed. Notably, miR‑26a was demonstrated to target the 3'‑untranslated region of mdm2 directly. The results of the present study are the first to demonstrate as far as the authors are aware that the mdm2/p53 negative feedback loop may be targeted by miR‑26a directly in response to LR, and that mdm2 negatively regulates p53, p21 and p27 but not miR‑26a. miR‑26a may therefore function as an important factor that regulates the interaction between mdm2 and p53.
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Affiliation(s)
- Jian Zhou
- Organ Transplant Centre, The First Affiliated Hospital of Sun Yat‑sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Zhuoyuan Li
- Organ Transplant Centre, The First Affiliated Hospital of Sun Yat‑sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Yingbin Huang
- Organ Transplant Centre, The First Affiliated Hospital of Sun Yat‑sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Weiqiang Ju
- Organ Transplant Centre, The First Affiliated Hospital of Sun Yat‑sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Dongping Wang
- Organ Transplant Centre, The First Affiliated Hospital of Sun Yat‑sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Xiaofeng Zhu
- Organ Transplant Centre, The First Affiliated Hospital of Sun Yat‑sen University, Guangzhou, Guangdong 510080, P.R. China
| | - Xiaoshun He
- Organ Transplant Centre, The First Affiliated Hospital of Sun Yat‑sen University, Guangzhou, Guangdong 510080, P.R. China
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Kim S, Park J, Na J, Jung GY, Hwang J. Simultaneous Determination of Multiple microRNA Levels Utilizing Biotinylated Dideoxynucleotides and Mass Spectrometry. PLoS One 2016; 11:e0153201. [PMID: 27380276 PMCID: PMC4933350 DOI: 10.1371/journal.pone.0153201] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Accepted: 03/24/2016] [Indexed: 12/31/2022] Open
Abstract
MicroRNAs (miRNAs) are important regulators of gene translation and have been suggested as potent biomarkers in various disease states. In this study, we established an efficient method for simultaneous determination of multiple miRNA levels, employing the previously developed SPC-SBE (solid phase capture-single base extension) approach and MALDI-TOF mass spectrometry (MS). In this approach, we first perform reverse transcription of miRNAs extracted using stem-loop primers. Then the cDNA is co-amplified with competitors, synthetic oligonucleotides whose sequences precisely match cDNA except for one base, and the amplicons serve as templates for a multiplexed SBE reaction. Extension products are isolated using SPC and quantitatively analyzed with MALDI-TOF MS to determine multiple miRNA levels. Here we demonstrated concurrent analysis of four miRNA levels utilizing the approach. Furthermore, we showed the presented method significantly facilitated MS analysis of peak area ratio owing to SPC. The SPC process allowed effective removal of irrelevant reaction components prior to MS and promoted MS sample purification. Data obtained in this study was verified with RT-qPCR and agreement was shown on one order of magnitude scale, suggesting the SPC-SBE and MS approach has strong potential as a viable tool for high throughput miRNA analysis.
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Affiliation(s)
- Sobin Kim
- Graduate School for Biomedical Science & Engineering, Hanyang University, Seoul, Korea
- * E-mail: (SK); (JH)
| | - Jungyun Park
- Graduate School for Biomedical Science & Engineering, Hanyang University, Seoul, Korea
| | - Jeongkyeong Na
- School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang, Gyeongbuk, Korea
| | - Gyoo Yeol Jung
- School of Interdisciplinary Bioscience and Bioengineering, Pohang University of Science and Technology, Pohang, Gyeongbuk, Korea
- Department of Chemical Engineering, Pohang University of Sciences and Technology, Pohang, Gyeongbuk, Korea
| | - Jungwook Hwang
- Graduate School for Biomedical Science & Engineering, Hanyang University, Seoul, Korea
- Department of Medical Genetics, College of Medicine, Hanyang University, Seoul, Korea
- * E-mail: (SK); (JH)
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Zhou J, Ju WQ, Yuan XP, Zhu XF, Wang DP, He XS. miR-26a regulates mouse hepatocyte proliferation via directly targeting the 3' untranslated region of CCND2 and CCNE2. Hepatobiliary Pancreat Dis Int 2016; 15:65-72. [PMID: 26818545 DOI: 10.1016/s1499-3872(15)60383-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND The deficiency of liver regeneration needs to be addressed in the fields of liver surgery, split liver transplantation and living donor liver transplantation. Researches of microRNAs would broaden our understandings on the mechanisms of various diseases. Our previous research confirmed that miR-26a regulated liver regeneration in mice; however, the relationship between miR-26a and its target, directly or indirectly, remains unclear. Therefore, the present study further investigated the mechanism of miR-26a in regulating mouse hepatocyte proliferation. METHODS An established mouse liver cell line, Nctc-1469, was transfected with Ad5-miR-26a-EGFP, Ad5-anti-miR-26a-EGFP or Ad5-EGFP vector. Cell proliferation was assessed by MTS, cell apoptosis and cell cycle by flow cytometry, and gene expression by Western blotting and quantitative real-time PCR. Dual-luciferase reporter assays were used to test targets of miR-26a. RESULTS Compared with the Ad5-EGFP group, Ad5-anti-miR-26a-EGFP down-regulated miR-26a and increased proliferation of hepatocytes, with more cells entering the G1 phase of cell cycle (82.70%+/-1.45% vs 75.80%+/-3.92%), and decreased apoptosis (5.50%+/-0.35% vs 6.73%+/-0.42%). CCND2 and CCNE2 were the direct targeted genes of miR-26a. miR-26a down-regulation up-regulated CCND2 and CCNE2 expressions and down-regulated p53 expression in Nctc-1469 cells. On the contrary, miR-26a over-expression showed the opposite results. CONCLUSIONS miR-26a regulated mouse hepatocyte proliferation by directly targeting the 3' untranslated regions of cyclin D2/cyclin E2; miR-26a also regulated p53-mediated apoptosis. Our data suggested that miR-26a may be a promising regulator in liver regeneration.
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Affiliation(s)
- Jian Zhou
- Organ Transplant Center, the First Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510080, China.
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Cai QY, Ren GL, Zhang WY, Ma HH. Construction of a eukaryotic vector expressing human miR-155 and inhibitory effect of miR-155 on HBeAg in HepG2.2.15 cells. Shijie Huaren Xiaohua Zazhi 2014; 22:4217-4222. [DOI: 10.11569/wcjd.v22.i28.4217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To construct an eukaryotic vector carrying human microRNA-155 (miR-155) and to analyze the inhibitory effect of miR-155 on HBeAg in HepG2.2.15 cells.
METHODS: The pre-miR-155 was amplified from total DNA of human hepatoma cell line HepG2.2.15 by PCR. The target gene fragment was digested with EcoRⅠ and BamHⅠ, and cloned into the pmR-mCherry plasmid. Restriction digestion and DNA sequencing were performed to evaluate the recombinant vector. miR-155 was transfected into HepG2.2.15 cells by liposome-mediated method. The cells transfected with empty plasmid and untransfected cells were used as controls. The expression of cherry was detected by fluorescence microscopy after 24 h. The intracellular expression of miR-155 was detected by RT-PCR. ELISA was carried out to analyze the levels of HBeAg.
RESULTS: The pmiR-155 eukaryotic expression vector was successfully constructed. Fluorescence microscopy showed that the cherry protein was expressed in the HepG2.2.15 cells. miR-155 level in HepG2.2.15 cells transfected with the recombinant plasmid was significantly higher than those in controls. Compared with cells transfected with empty plasmid and untransfected cells, specific miR-155 could significantly decrease HBeAg gene expression in HepG2.2.15 cells.
CONCLUSION: A recombinant plasmid expressing miR-155 has been successfully constructed, and miR-155 is expressed stably in HepG2.2.15 cells. miR-155 can inhibit the expression of HBeAg in HepG2.2.15 cells.
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miR-1246 releases RTKN2-dependent resistance to UVB-induced apoptosis in HaCaT cells. Mol Cell Biochem 2014; 394:299-306. [DOI: 10.1007/s11010-014-2108-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Accepted: 05/15/2014] [Indexed: 02/06/2023]
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Shen Y, Lu L, Xu J, Meng W, Qing Y, Liu Y, Zhang B, Hu H. Bortezomib induces apoptosis of endometrial cancer cells through microRNA-17-5p by targeting p21. Cell Biol Int 2013; 37:1114-21. [PMID: 23716467 DOI: 10.1002/cbin.10139] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2013] [Accepted: 04/29/2013] [Indexed: 11/11/2022]
Abstract
Bortezomib suppresses ubiquitin (Ub)-dependent protein degradation and preferentially kills various tumour cells in vitro and in animal models. However, its mechanism of action is not fully understood. We report that bortezomib inhibits the proliferation and proteasomal activity of human endometrial cancer cells and induces G2/M arrest and apoptosis by modulating the miRNA level. By miRNA microarray, iR-17-5p was the most downregulated of all those in HTB-111 and Ishikawa cells after bortezomib treatment. This observation was confirmed by quantitative real-time PCR (qRT-PCR). Target prediction using TargetScan software identified p21 as a potential target for miR-17-5p, which was confirmed by luciferase reporter, qRT-PCR and Western blot assays. The transfection of miR-17-5p mimics or siRNA-p21 reversed the effect of bortezomib on HTB-111 and Ishikawa cells, indicating that miR-17-5p may mediate the function of bortezomib by targeting p21 in endometrial cancer cells. These findings show novel mechanisms by which bortezomib inhibits proliferation and promotes the apoptosis of human endometrial cancer cells.
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Affiliation(s)
- Yuan Shen
- Gynecology and Obstetrics Department of the First Affiliated Hospital of JiNan University, Guangzhou, 510630, China
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Sroubek J, Krishnan Y, McDonald TV. Sequence and structure-specific elements of HERG mRNA determine channel synthesis and trafficking efficiency. FASEB J 2013; 27:3039-53. [PMID: 23608144 DOI: 10.1096/fj.12-227009] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Human ether-á-gogo-related gene (HERG) encodes a potassium channel that is highly susceptible to deleterious mutations resulting in susceptibility to fatal cardiac arrhythmias. Most mutations adversely affect HERG channel assembly and trafficking. Why the channel is so vulnerable to missense mutations is not well understood. Since nothing is known of how mRNA structural elements factor in channel processing, we synthesized a codon-modified HERG cDNA (HERG-CM) where the codons were synonymously changed to reduce GC content, secondary structure, and rare codon usage. HERG-CM produced typical IKr-like currents; however, channel synthesis and processing were markedly different. Translation efficiency was reduced for HERG-CM, as determined by heterologous expression, in vitro translation, and polysomal profiling. Trafficking efficiency to the cell surface was greatly enhanced, as assayed by immunofluorescence, subcellular fractionation, and surface labeling. Chimeras of HERG-NT/CM indicated that trafficking efficiency was largely dependent on 5' sequences, while translation efficiency involved multiple areas. These results suggest that HERG translation and trafficking rates are independently governed by noncoding information in various regions of the mRNA molecule. Noncoding information embedded within the mRNA may play a role in the pathogenesis of hereditary arrhythmia syndromes and could provide an avenue for targeted therapeutics.
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Affiliation(s)
- Jakub Sroubek
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York, USA
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Kato M, Nakayama M, Agata M, Yoshida K. Gene expression levels of human shelterin complex and shelterin-associated factors regulated by the topoisomerase II inhibitors doxorubicin and etoposide in human cultured cells. Tumour Biol 2012; 34:723-33. [PMID: 23247865 DOI: 10.1007/s13277-012-0600-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2012] [Accepted: 11/16/2012] [Indexed: 02/08/2023] Open
Abstract
Human telomerase reverse transcriptase (hTERT) is responsible for telomere elongation, and its activity is strongly related to the expression level of the hTERT gene; however, the transcriptional regulation of telomeric genes, which play a central role in telomere maintenance and protection by facilitating replication and regulating telomerase access, is poorly understood. In this study, we aimed to reveal the changes in the mRNA expression of six components of the shelterin complex and three shelterin complex-associated factors in topoisomerase II inhibitor-treated human cultured cells. Using a quantitative gene expression analysis, we found that a reduction in telomeric repeat-binding factor 1 (TRF1), protection of telomeres (POT1), and TRF1-interacting ankyrin-related ADP-ribose polymerase 1 (TNKS1) mRNAs was observed in etoposide- and doxorubicin-treated HeLa and U-2 OS cells, while an increased TRF2-interacting telomeric protein (RAP1) mRNA level was observed in U-2 OS cells. Furthermore, doxorubicin suppressed TRF1 and POT1 mRNAs in both Saos-2 and WI-38 cells and increased RAP1 mRNA in WI-38 cells. In agreement with the results obtained in the quantitative gene expression analysis in U-2 OS cells, the topoisomerase II inhibitors negatively and positively regulated the POT1 and RAP1 gene promoters, respectively. Taken together, these results suggest the successful identification of unique topoisomerase II inhibitor-inducible telomeric genes and provide mechanistic insight into the regulation of telomeric gene expression by chemotherapeutic agents.
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Affiliation(s)
- Masahiro Kato
- Department of Life Sciences, Meiji University, 1-1-1 Higashimita, Tama-ku, Kawasaki, Kanagawa, 214-8571, Japan
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Pan C, Chen H, Wang L, Yang S, Fu H, Zheng Y, Miao M, Jiao B. Down-regulation of MiR-127 facilitates hepatocyte proliferation during rat liver regeneration. PLoS One 2012; 7:e39151. [PMID: 22720056 PMCID: PMC3376093 DOI: 10.1371/journal.pone.0039151] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Accepted: 05/16/2012] [Indexed: 01/27/2023] Open
Abstract
Liver regeneration (LR) after partial hepatectomy (PH) involves the proliferation and apoptosis of hepatocytes, and microRNAs have been shown to post-transcriptionally regulate genes involved in the regulation of these processes. To explore the role of miR-127 during LR, the expression patterns of miR-127 and its related proteins were investigated. MiR-127 was introduced into a rat liver cell line to examine its effects on the potential target genes Bcl6 and Setd8, and functional studies were undertaken. We discovered that miR-127 was down-regulated and inversely correlated with the expression of Bcl6 and Setd8 at 24 hours after PH, a time at which hypermethylation of the promoter region of the miR-127 gene was detected. Furthermore, in BRL-3A rat liver cells, we observed that overexpression of miR-127 significantly suppressed cell growth and directly inhibited the expression of Bcl6 and Setd8. The results suggest that down-regulation of miR-127 may be due to the rapid methylation of its promoter during the first 24 h after PH, and this event facilitates hepatocyte proliferation by releasing Bcl6 and Setd8. These findings support a miRNA-mediated negative regulation pattern in LR and implicate an anti-proliferative role for miR-127 in liver cells.
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Affiliation(s)
- Chuanyong Pan
- Department of Biochemistry and Molecular Biology, Second Military Medical University, Shanghai, China
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15
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Zhou J, Ju W, Wang D, Wu L, Zhu X, Guo Z, He X. Down-regulation of microRNA-26a promotes mouse hepatocyte proliferation during liver regeneration. PLoS One 2012; 7:e33577. [PMID: 22496754 PMCID: PMC3319545 DOI: 10.1371/journal.pone.0033577] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2011] [Accepted: 02/14/2012] [Indexed: 12/21/2022] Open
Abstract
Background Inadequate liver regeneration (LR) is still an unsolved problem in major liver resection and small-for-size syndrome post-living donor liver transplantation. A number of microRNAs have been shown to play important roles in cell proliferation. Herein, we investigated the role of miR-26a as a pivotal regulator of hepatocyte proliferation in LR. Methodology/Principal Findings Adult male C57BL/6J mice, undergoing 70% partial hepatectomy (PH), were treated with Ad5-anti-miR-26a-LUC or Ad5-miR-26a-LUC or Ad5-LUC vector via portal vein. The animals were subjected to in vivo bioluminescence imaging. Serum and liver samples were collected to test liver function, calculate liver-to-body weight ratio (LBWR), document hepatocyte proliferation (Ki-67 staining), and investigate potential targeted gene expression of miR-26a by quantitative real-time PCR and Western blot. The miR-26a level declined during LR after 70% PH. Down-regulation of miR-26a by anti-miR-26a expression led to enhanced proliferation of hepatocytes, and both LBWR and hepatocyte proliferation (Ki-67+ cells %) showed an increased tendency, while liver damage, indicated by aspartate aminotransferase (AST), alanine aminotransferase (ALT) and total bilirubin (T-Bil), was reduced. Furthermore, CCND2 and CCNE2, as possible targeted genes of miR-26a, were up-regulated. In addition, miR-26a over-expression showed converse results. Conclusions/Significance MiR-26a plays crucial role in regulating the proliferative phase of LR, probably by repressing expressions of cell cycle proteins CCND2 and CCNE2. The current study reveals a novel miRNA-mediated regulation pattern during the proliferative phase of LR.
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Affiliation(s)
- Jian Zhou
- Organ Transplant Center, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Weiqiang Ju
- Organ Transplant Center, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Dongping Wang
- Organ Transplant Center, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Linwei Wu
- Organ Transplant Center, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Xiaofeng Zhu
- Organ Transplant Center, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - Zhiyong Guo
- Organ Transplant Center, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
- * E-mail: (ZG); (XH)
| | - Xiaoshun He
- Organ Transplant Center, the First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
- * E-mail: (ZG); (XH)
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Yuan B, Dong R, Shi D, Zhou Y, Zhao Y, Miao M, Jiao B. Down-regulation of miR-23b may contribute to activation of the TGF-β1/Smad3 signalling pathway during the termination stage of liver regeneration. FEBS Lett 2011; 585:927-34. [PMID: 21354414 DOI: 10.1016/j.febslet.2011.02.031] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2010] [Revised: 02/14/2011] [Accepted: 02/21/2011] [Indexed: 12/11/2022]
Abstract
MicroRNAs (miRNAs) are known to play important roles in liver regeneration, although the role of miRNAs associated with the termination of liver regeneration is not as well studied. Here we reported the down-regulation of miR-23b in the termination stage of liver regeneration in rats. In addition, Smad3 was identified as a target of miR-23b during liver regeneration. Up-regulation of miR-23b promoted BRL-3A cell proliferation and partially inhibited transforming growth factor (TGF)-β1-induced apoptosis. Furthermore, TGF-β1 transcriptionally inhibited miR-23b expression. We conclude that down-regulation of miR-23b may contribute to activation of the TGF-β1/Smad3 signalling pathway during the termination stage of liver regeneration.
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Affiliation(s)
- Bin Yuan
- Department of Biochemistry and Molecular Biology, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, People's Republic of China
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