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Chen WQ, Tian FL, Zhang JW, Yang XJ, Li YP. Preventive and inhibitive effects of Yiwei Xiaoyu granules on the development and progression of spasmolytic polypeptide-expressing metaplasia lesions. World J Gastrointest Oncol 2021; 13:1741-1754. [PMID: 34853647 PMCID: PMC8603444 DOI: 10.4251/wjgo.v13.i11.1741] [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] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 07/10/2021] [Accepted: 08/24/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Spasmolytic polypeptide-expressing metaplasia (SPEM) is a potential preneoplastic lesion.
AIM To elucidate the microRNA (miR)-7-mediated preventive and inhibitive effects of Yiwei Xiaoyu granules (YWXY) in SPEM lesions.
METHODS Gastric mucosa biopsies were collected from chronic atrophic gastritis patients and healthy people with signed informed consent. YWXY was administered to the mice with induced SPEM by tamoxifen, and the gastric mucosa was harvested on the tenth day of the experiment. Then immunohistochemistry and immunofluorescence were performed to validate the SPEM, lesions and the potential mechanism was investigated. RNA transcripts were detected with reverse transcription-quantitative polymerase chain reaction.
RESULTS The expression of miR-7 was downregulated in the SPEM lesions, and expression of trefoil factor 2 (TFF2) and clusterin was high in the human gastric mucosa. In vivo experiments showed that YWXY could inhibit the cell proliferation in the tamoxifen-induced SPEM lesions by regulating Ki67. Simultaneously, YWXY could restore the expression of miR-7 by regulating TFF2 by detection with immunofluorescence but not with reverse transcription-quantitative polymerase chain reaction, indicating its potential mechanism of targeting miR-7 by mediating TFF2. The expression of vascular endothelial growth factor-β and gastric intrinsic factor was restored within 3 d of YWXY administration for the SPEM lesions, speculating that the possible mechanism of YWXY is to inhibit the development and progression of SPEM by regulating vascular endothelial growth factor-β and gastric intrinsic factor.
CONCLUSION miR-7 downregulation is an early event in SPEM through regulation of TFF2 in human gastric mucosa. YWXY is able to inhibit the cell proliferation and restore the expression of miR-7 by mediating TFF2 in the SPEM mouse model.
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Affiliation(s)
- Wan-Qun Chen
- Department of Gastroenterology, Chongqing Hospital of Traditional Chinese Medicine, Chongqing 400000, China
| | - Feng-Liang Tian
- Department of Gastroenterology, Chongqing Hospital of Traditional Chinese Medicine, Chongqing 400000, China
| | - Jin-Wei Zhang
- Department of Dermatology and Cosmetology, Chongqing Hospital of Traditional Chinese Medicine, Chongqing 400000, China
| | - Xiao-Jun Yang
- Department of Gastroenterology, Chongqing Hospital of Traditional Chinese Medicine, Chongqing 400000, China
| | - Yan-Ping Li
- Department of Gastroenterology, Chongqing Hospital of Traditional Chinese Medicine, Chongqing 400000, China
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Lin J, Liu Z, Liao S, Li E, Wu X, Zeng W. Elevated microRNA-7 inhibits proliferation and tumor angiogenesis and promotes apoptosis of gastric cancer cells via repression of Raf-1. Cell Cycle 2020; 19:2496-2508. [PMID: 32931357 PMCID: PMC7553585 DOI: 10.1080/15384101.2020.1807670] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Revised: 07/01/2020] [Accepted: 08/01/2020] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVE Since the essential involvement of microRNAs (miRNAs) in the development and progression of GC, the study was for the exploration of the value of microRNA-7 (miR-7) in the evaluation of neoadjuvant chemotherapy for gastric cancer (GC) and its effects on apoptosis, proliferation and angiogenesis of GC. METHODS miR-7 expression in serum of GC patients before and after neoadjuvant chemotherapy were detected to explore its role in neoadjuvant chemotherapy of GC. The GC cells were transfected with miR-7 mimics/inhibitors, or siRNA-Raf-1 to figure out their roles in proliferation, migration, invasion, cycle distribution and apoptosis. Tumor xenograft was conducted to test tumor growth. Microvessel density (MVD) in tumors was tested by immunohistochemical staining. RESULTS miR-7 expression in serum of GC patients was lower than that of healthy controls while it was elevated after neoadjuvant chemotherapy. Moreover, higher miR-7 expression was exhibited in chemotherapy-effective patients rather than chemotherapy-ineffective patients (P < 0.01). miR-7 expression in serum was connected with tumor size, degree of differentiation, TNM stage and lymphatic metastasis.miR-7 was decreased and Raf-1 was elevated in GC cells (both P < 0.05). Elevated miR-7 or declined Raf-1 inhibited GC cell migration, proliferation and invasion, cell cycle entry, xenografted tumor growth and MVD and stimulated apoptosis (all P < 0.05). Down-regulated Raf-1 reversed the impacts of miR-7 knockdown on GC cells (all P < 0.05). CONCLUSION Our study highlights that elevated miR-27a indicates the good efficacy of neoadjuvant chemotherapy in GC and miR-7 targets Raf-1 to suppress tumor development and angiogenesis of GC cells.
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Affiliation(s)
- Jing Lin
- Oncology Department, The First Affiliated Hospital of Shantou University Medical College, Shantou, China
- CONTACT Jing Lin
| | - Zewa Liu
- Oncology Department, The First Affiliated Hospital of Shantou University Medical College, Shantou, China
| | - Shasha Liao
- Oncology Department, Shantou Longhu People’s Hospital, Shantou, Guangdong, China
| | - E Li
- Oncology Department, Shantou Longhu People’s Hospital, Shantou, Guangdong, China
| | - Xiaohua Wu
- Oncology Department, Shantou Longhu People’s Hospital, Shantou, Guangdong, China
| | - Wanting Zeng
- MSci Applied Medical Science, Division of Medicine, University College London, London, WC1E 6BT, United Kingdom
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Fan X, Liu M, Tang H, Leng D, Hu S, Lu R, Wan W, Yuan S. MicroRNA-7 Exerts Antiangiogenic Effect on Colorectal Cancer via ERK Signaling. J Surg Res 2019; 240:48-59. [PMID: 30909065 DOI: 10.1016/j.jss.2019.02.035] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 12/27/2018] [Accepted: 02/21/2019] [Indexed: 12/13/2022]
Abstract
BACKGROUND Recent studies have suggested that microRNA-7 (miR-7) family members may play important roles in human cancer by regulating cell proliferation, apoptosis, migration, and invasion. Therefore, the present study aimed to investigate the clinical significance and biological function of miR-7 in colorectal cancer (CRC). METHODS Initially, cancer and adjacent tissues were collected from 76 patients with CRC. Then, microvascular density was detected using the Weidner counting method. The functional role of miR-7 in CRC was determined using ectopic expression, knockdown, and reporter assay experiments. The vasculogenic mimicry density was determined. Expression of miR-7, epidermal growth factor receptor (EGFR), extracellular signal-regulated kinase (ERK1/2), vascular endothelial growth factor, and thrombospondin-1 was determined. 3-(4, 5-Dimethylthiazol-2-yl)-2, 5-diphenyltetrazolium bromide assays, scratch tests, and Transwell assays were conducted to examine cell proliferation, migration, and invasion, respectively. Finally, flow cytometry was applied to evaluate cell apoptosis. RESULTS CRC tissues showed increased microvascular density and EGFR expression, activated ERK signaling, and miR-7 downregulation. EGFR was a target gene of miR-7. miR-7 overexpression and EGFR silencing decreased vasculogenic mimicry density, cell migration, and cell invasion, but increased cell apoptosis. In addition, miR-7 overexpression and EGFR silencing upregulated thrombospondin-1 and downregulated EGFR, ERK1/2, and vascular endothelial growth factor. Furthermore, we observed that the effect of miR-7 inhibition was abolished after EGFR silencing. CONCLUSIONS Overexpressed miR-7 suppresses angiogenesis of CRC cells through ERK signaling by downregulating EGFR. It may identify new targets for CRC treatment.
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Affiliation(s)
- Xuepeng Fan
- Department of Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Institute of Anesthesia and Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Department of Intensive Care Unit, Wuhan NO.1 Hospital, Wuhan, China
| | - Mei Liu
- Department of Intensive Care Unit, Wuhan NO.1 Hospital, Wuhan, China
| | - Hao Tang
- Department of Intensive Care Unit, Wuhan NO.1 Hospital, Wuhan, China
| | - Dewen Leng
- Department of Intensive Care Unit, Wuhan NO.1 Hospital, Wuhan, China
| | - Shuli Hu
- Department of Intensive Care Unit, Wuhan NO.1 Hospital, Wuhan, China
| | - Rong Lu
- Department of Intensive Care Unit, Wuhan NO.1 Hospital, Wuhan, China
| | - Weibo Wan
- Department of Intensive Care Unit, Wuhan NO.1 Hospital, Wuhan, China
| | - Shiying Yuan
- Department of Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Institute of Anesthesia and Critical Care Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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Qin AD, Liu XX, Li J, Liu J, Li YS. [The effects of microRNA-7 on proliferation and invasion of hepatocellular carcinoma HepG2 cells]. Zhonghua Zhong Liu Za Zhi 2018; 40:406-411. [PMID: 29936764 DOI: 10.3760/cma.j.issn.0253-3766.2018.06.002] [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] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Objective: To investigate the effects of overexpression of microRNA-7 (miR-7) on the proliferation and invasion of HepG2 cells and the underlying mechanism in vitro. Methods: The relative expression levels of miR-7 and Raf1 in hepatocellular carcinoma (HCC) tissues and adjacent normal tissues (ANT) were detected by quantitative real time-PCR (qRT-PCR). The relationship between the expression of miR-7 and the characteristics of HCC patients was analyzed. Cells were divided into blank control group, negative control (NC) group and miR-7 mimics transfected group, miR-7 mimics and NC were transfected into HepG2 cells by Lipofectamine™2000. The relative expression of miR-7 was detected by qRT-PCR. The proliferation ability of HepG2 cells was detected by 3-(4, 5-dimethyl-2-thiazolyl)-2, 5-diphenyl-2-H-tetrazolium bromide (MTT) assay. The invasion of HepG2 cells was detected by Transwell assay. The target genes of miR-7 were predicted by TargetScan and the binding effect of miR-7 on the 3'UTR of Raf1 was verified by dual luciferase reporter assay.The expressions of Raf1 protein in hepatocellular carcinoma tissues, normal tissues and miR-7 mimics transfected HepG2 cells was detected by Western blot. The correlation of the levels of miR-7 and Raf1 mRNA was determined by Pearson correlation analysis. Results: The relative expression level of miR-7 in HCC was 0.49±0.02, significantly lower than in ANT (1.21±0.05, P<0.01). The level of miR-7 was significantly correlated the tumor volume, metastasis and prognosis of HCC patients (P<0.05). The relative expression level of miR-7 in miR-7 mimics transfected HepG2 group was 12.67±0.40, significantly higher than that in blank group (P<0.01). Compared with the blank group, the A value and invasion ability of miR-7 mimics transfected group were significantly down-regulated at 48 hours and 72 hours after transfection (P<0.01). Compared with miR-7 NC group, the luciferase activity of wild-type Raf1 reporter gene in miR-7 mimics transfected group was significantly reduced (P<0.01). The relative expression of Raf1 protein in HCC was 3.15±0.10, significant higher than in ANT (0.53±0.03, P<0.01). The relative expression of Raf1 protein in miR-7 mimics transfected group was 0.24±0.01, significantly lower than in miR-7 NC group (0.98±0.02, P<0.01). Furthermore, an negative correlation was observed between the levels of miR-7 and Raf1 in HCC tissues (P<0.05). Conclusions: The expression of miR-7 in HCC is significantly decreased and inversely correlated with poor survival of HCC patients. Overexpression of miR-7 can inhibit the proliferation and invasion ability of hepatocellular carcinoma cells HepG2 by downregulating Raf1 in vitro.
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Affiliation(s)
- A D Qin
- Research Institute of Liver Disease, the Fourth People's Hospital of Huai'an, Huai'an 223002, China
| | - X X Liu
- Clinical Laboratory, the Fourth People's Hospital of Huai'an, Huai'an 223002, China
| | - J Li
- Department of Liver Disease, the Fourth People's Hospital of Huai'an, Huai'an 223002, China
| | - J Liu
- Clinical Laboratory, the Fourth People's Hospital of Huai'an, Huai'an 223002, China
| | - Y S Li
- Clinical Laboratory, the Fourth People's Hospital of Huai'an, Huai'an 223002, China
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Choi DC, Yoo M, Kabaria S, Junn E. MicroRNA-7 facilitates the degradation of alpha-synuclein and its aggregates by promoting autophagy. Neurosci Lett 2018; 678:118-23. [PMID: 29738845 DOI: 10.1016/j.neulet.2018.05.009] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 05/04/2018] [Indexed: 01/26/2023]
Abstract
Alpha-Synuclein (α-Syn) is an important protein in the pathogenesis of Parkinson disease (PD) as it accumulates as fibrillar inclusions in affected brain regions including dopaminergic neurons in the substantia nigra. Elevated levels of α-Syn seem to be crucial in mediating its toxicity. Thus, detailed information regarding the regulatory mechanism of α-Syn expression in several layers such as transcription, post-transcription and post-translation is needed in order to devise therapeutic interventions for PD. Previously, we reported that expression of α-Syn is repressed by microRNA-7 (miR-7) through its effect on the 3'-untranslated region (UTR) of α-Syn mRNA. Here, we show that miR-7 also accelerates the clearance of α-Syn and its aggregates by promoting autophagy in differentiated ReNcell VM cells. Further, miR-7 facilitates the degradation of pre-formed fibrils of α-Syn transported from outside the cells. This additional mechanism for reducing α-Syn levels show miR-7 to be an important molecular target for PD and other alpha-synucleinopathies.
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Garcia-Morales V, Friedrich J, Jorna LM, Campos-Toimil M, Hammes HP, Schmidt M, Krenning G. The microRNA-7-mediated reduction in EPAC-1 contributes to vascular endothelial permeability and eNOS uncoupling in murine experimental retinopathy. Acta Diabetol 2017; 54:581-591. [PMID: 28353063 PMCID: PMC5429352 DOI: 10.1007/s00592-017-0985-y] [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] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2016] [Accepted: 03/16/2017] [Indexed: 01/08/2023]
Abstract
AIMS To investigate the consequences of oxidative stress and hypoxia on EPAC-1 expression during retinopathy. METHODS Oxygen-induced retinopathy was induced in mice and EPAC-1 expression investigated by immunofluorescence. In silico analyses were used to identify a link between EPAC-1 expression and microRNA-7-5p in endothelial cells and confirmed by western blot analyses on cells expressing microRNA-7-5p. In vitro, endothelial cells were either incubated at 2% oxygen or transfected with microRNA-7-5p, and the effects of these treatments on EPAC-1 expression, endothelial hyperpermeability and NO production were assessed. In the Ins2Akita mouse model, levels of EPAC-1 expression as well as microRNA-7-5p were assessed by qPCR. Endothelial nitric oxide synthase was assessed by immunoblotting in the Ins2Akita model. RESULTS Hypoxia induces the expression of microRNA-7-5p that translationally inhibits the expression of EPAC-1 in endothelial cells, resulting in hyperpermeability and the loss of eNOS activity. Activation of EPAC-1 by the cAMP analogue 8-pCPT-2'-O-Me-cAMP reduced the sensitivity of EPAC-1 to oxidative stress and restored the endothelial permeability to baseline levels. Additionally, 8-pCPT-2'-O-Me-cAMP rescued eNOS activity and NO production. In mouse models of retinopathy, i.e., oxygen-induced retinopathy and the spontaneous diabetic heterozygous Ins2Akita mice, EPAC-1 levels are decreased which is associated with an increase in microRNA-7-5p expression and reduced eNOS activity. CONCLUSION/INTERPRETATION In retinopathy, EPAC-1 expression is decreased in a microRNA-7-mediated manner, contributing to endothelial dysfunction. Pharmacological activation of remnant EPAC-1 rescues endothelial function. Collectively, these data indicate that EPAC-1 resembles an efficacious and druggable target molecule for the amelioration of (diabetic) retinopathy.
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Affiliation(s)
- Veronica Garcia-Morales
- Group of Research in Pharmacology of Chronic Diseases (CDPHARMA), Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela, 15782, Santiago de Compostela, Spain
- International Research and Training Network on Diabetic Microvascular Complications (GRK1874/DIAMICOM), University of Heidelberg, Heidelberg, Germany
- International Research and Training Network on Diabetic Microvascular Complications (GRK1874/DIAMICOM), University Medical Center Groningen, Groningen, The Netherlands
- Cardiovascular Regenerative Medicine (CAVAREM), Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, Hanzeplein 1 (EA11), 9713 GZ, Groningen, The Netherlands
| | - Julian Friedrich
- International Research and Training Network on Diabetic Microvascular Complications (GRK1874/DIAMICOM), University of Heidelberg, Heidelberg, Germany
- International Research and Training Network on Diabetic Microvascular Complications (GRK1874/DIAMICOM), University Medical Center Groningen, Groningen, The Netherlands
- Cardiovascular Regenerative Medicine (CAVAREM), Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, Hanzeplein 1 (EA11), 9713 GZ, Groningen, The Netherlands
- Section of Endocrinology, 5th Medical Department, Medical Faculty Mannheim, University of Heidelberg, Heidelberg, Germany
| | - Lysanne M Jorna
- Cardiovascular Regenerative Medicine (CAVAREM), Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, Hanzeplein 1 (EA11), 9713 GZ, Groningen, The Netherlands
| | - Manuel Campos-Toimil
- Group of Research in Pharmacology of Chronic Diseases (CDPHARMA), Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela, 15782, Santiago de Compostela, Spain
| | - Hans-Peter Hammes
- International Research and Training Network on Diabetic Microvascular Complications (GRK1874/DIAMICOM), University of Heidelberg, Heidelberg, Germany
- International Research and Training Network on Diabetic Microvascular Complications (GRK1874/DIAMICOM), University Medical Center Groningen, Groningen, The Netherlands
- Section of Endocrinology, 5th Medical Department, Medical Faculty Mannheim, University of Heidelberg, Heidelberg, Germany
| | - Martina Schmidt
- International Research and Training Network on Diabetic Microvascular Complications (GRK1874/DIAMICOM), University of Heidelberg, Heidelberg, Germany
- International Research and Training Network on Diabetic Microvascular Complications (GRK1874/DIAMICOM), University Medical Center Groningen, Groningen, The Netherlands
- Department of Molecular Pharmacology, University of Groningen, Groningen, The Netherlands
| | - Guido Krenning
- International Research and Training Network on Diabetic Microvascular Complications (GRK1874/DIAMICOM), University of Heidelberg, Heidelberg, Germany.
- International Research and Training Network on Diabetic Microvascular Complications (GRK1874/DIAMICOM), University Medical Center Groningen, Groningen, The Netherlands.
- Cardiovascular Regenerative Medicine (CAVAREM), Department of Pathology and Medical Biology, University Medical Center Groningen, University of Groningen, Hanzeplein 1 (EA11), 9713 GZ, Groningen, The Netherlands.
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Li S, Lv X, Zhai K, Xu R, Zhang Y, Zhao S, Qin X, Yin L, Lou J. MicroRNA-7 inhibits neuronal apoptosis in a cellular Parkinson's disease model by targeting Bax and Sirt2. Am J Transl Res 2016; 8:993-1004. [PMID: 27158385 PMCID: PMC4846942] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2015] [Accepted: 01/08/2016] [Indexed: 06/05/2023]
Abstract
Parkinson's disease (PD) is the second most common age-related neurodegenerative disease. MicroRNA-7 (miR-7) displays neuroprotective properties against PD. However, the biological roles of miR-7 and its underlying molecular mechanisms in PD remain unclear. We demonstrated herein that 1-methyl-4-phenylpyridinium ion (MPP(+)) confers toxic effects on dopaminergic neuron in a dose-dependent manner in a cellular PD model, although this phenomenon is attenuated by miR-7 treatment. Introduction of miR-7 inhibits MPP(+)-induced neuronal apoptosis as reflected by the reduced terminal transferase-mediated dUTP nick end labeling-positive rate, mitochondrial permeability potential, caspase 3 activity, and nucleosomal enrichment factor. Bax and sirtuin 2 (Sirt2) are the direct targets of miR-7. Moreover, the effects of miR-7 were counteracted by Bax and Sirt2 overexpression, respectively. The altered molecular expressions downstream of Bax and Sirt2 are also involved in miR-7 regulation of the MPP(+)-triggered neuronal apoptosis. These findings have implications on the potential application of miR-7 in PD treatment.
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Affiliation(s)
- Shize Li
- Department of Neurology, The Second Affiliated Hospital of Zhengzhou UniversityZhengzhou 450014, China
| | - Xuecheng Lv
- Department of Pharmacy, The First People’s Hospital of Shangqiu476100, Henan, China
| | - Kaihua Zhai
- Department of Neurology, The Second Affiliated Hospital of Zhengzhou UniversityZhengzhou 450014, China
| | - Ruyan Xu
- Department of Neurology, Zhengzhou Central Hospital Affiliated to Zhengzhou UniversityZhengzhou 450007, China
| | - Yong Zhang
- Department of Neurology, Zhengzhou Central Hospital Affiliated to Zhengzhou UniversityZhengzhou 450007, China
| | - Songyao Zhao
- Department of Neurology, Zhengzhou Central Hospital Affiliated to Zhengzhou UniversityZhengzhou 450007, China
| | - Xiaoming Qin
- Department of Neurology, Zhengzhou Central Hospital Affiliated to Zhengzhou UniversityZhengzhou 450007, China
| | - Liujie Yin
- Department of Neurology, Zhengzhou Central Hospital Affiliated to Zhengzhou UniversityZhengzhou 450007, China
| | - Jiyu Lou
- Department of Neurology, The Second Affiliated Hospital of Zhengzhou UniversityZhengzhou 450014, China
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Abstract
There are several malignancies of the digestive system (including gastric, pancreatic and colorectal cancers, and hepatocellular carcinoma), which are the most common types of cancer and a major cause of death worldwide. MicroRNA (miR)-7 is abundant in the pancreas, playing an important role in pancreatic development and endocrine function. Expression of miR-7 is downregulated in digestive system malignancies compared with normal tissue. Although there are contrasting results for miR-7 expression, almost all research reveals that miR-7 is a tumor suppressor, by targeting various genes in specific pathways. Moreover, miR-7 can target different genes simultaneously in different malignancies of the digestive system. By acting on many cytokines, miR-7 is also involved in many gastrointestinal inflammatory diseases as a significant carcinogenic factor. Consequently, miR-7 might be a biomarker or therapeutic target gene in digestive system malignancies.
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Kabaria S, Choi DC, Chaudhuri AD, Jain MR, Li H, Junn E. MicroRNA-7 activates Nrf2 pathway by targeting Keap1 expression. Free Radic Biol Med 2015; 89:548-56. [PMID: 26453926 PMCID: PMC4684759 DOI: 10.1016/j.freeradbiomed.2015.09.010] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Revised: 09/25/2015] [Accepted: 09/28/2015] [Indexed: 12/30/2022]
Abstract
Nuclear factor E2-related factor 2 (Nrf2) is a key transcription factor that regulates the expression of a number of antioxidant and detoxifying genes that provide cellular protection against various stressors including reactive oxygen species (ROS). Nrf2 activity is tightly regulated by a cytoplasmic inhibitory protein called Kelch-like ECH-associated protein 1 (Keap1). The mechanism that controls Keap1 expression, however, remains poorly understood. In the present study, we demonstrate that microRNA-7 (miR-7), which is highly expressed in the brain, represses Keap1 expression by targeting the 3'-untranslated region (UTR) of its mRNA in human neuroblastoma cells, SH-SY5Y. Subsequently, this event results in an increased Nrf2 activity, as evidenced by an increase in the expression of its transcriptional targets, heme oxygenase 1 (HO-1) and glutamate-cysteine ligase modifier subunit (GCLM), and an enhanced nuclear localization of Nrf2. In addition, miR-7 decreases the intracellular hydroperoxides level and increases the level of reduced form of glutathione, indicative of oxidative stress relief. We also demonstrate that targeted repression of Keap1 and activation of Nrf2 pathway, in part, underlies the protective effects of miR-7 against 1-methyl-4-phenylpyridinium (MPP+)-induced toxicity in SH-SY5Y and differentiated human neural progenitor cells, ReNcell VM. These findings point to a new mechanism by which miR-7 exerts cytoprotective effects by regulating the Nrf2 pathway.
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Affiliation(s)
- Savan Kabaria
- Center for Neurodegenerative and Neuroimmunologic Diseases, Department of Neurology, Rutgers-Robert Wood Johnson Medical School, Piscataway, NJ., 08854, USA
| | - Doo Chul Choi
- Center for Neurodegenerative and Neuroimmunologic Diseases, Department of Neurology, Rutgers-Robert Wood Johnson Medical School, Piscataway, NJ., 08854, USA
| | - Amrita Datta Chaudhuri
- Center for Neurodegenerative and Neuroimmunologic Diseases, Department of Neurology, Rutgers-Robert Wood Johnson Medical School, Piscataway, NJ., 08854, USA
| | - Mohit Raja Jain
- Center for Advanced Proteomics Research, Rutgers-New Jersey Medical School, Newark, NJ., 07103, USA
| | - Hong Li
- Center for Advanced Proteomics Research, Rutgers-New Jersey Medical School, Newark, NJ., 07103, USA
| | - Eunsung Junn
- Center for Neurodegenerative and Neuroimmunologic Diseases, Department of Neurology, Rutgers-Robert Wood Johnson Medical School, Piscataway, NJ., 08854, USA.
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Horsham JL, Ganda C, Kalinowski FC, Brown RAM, Epis MR, Leedman PJ. MicroRNA-7: A miRNA with expanding roles in development and disease. Int J Biochem Cell Biol 2015; 69:215-24. [PMID: 26546742 DOI: 10.1016/j.biocel.2015.11.001] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [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: 09/20/2015] [Revised: 11/01/2015] [Accepted: 11/02/2015] [Indexed: 12/15/2022]
Abstract
MicroRNAs (miRNAs) are a family of short, non-coding RNA molecules (∼22nt) involved in post-transcriptional control of gene expression. They act via base-pairing with mRNA transcripts that harbour target sequences, resulting in accelerated mRNA decay and/or translational attenuation. Given miRNAs mediate the expression of molecules involved in many aspects of normal cell development and functioning, it is not surprising that aberrant miRNA expression is closely associated with many human diseases. Their pivotal role in driving a range of normal cellular physiology as well as pathological processes has established miRNAs as potential therapeutics, as well as potential diagnostic and prognostic tools in human health. MicroRNA-7 (miR-7) is a highly conserved miRNA which displays restricted spatiotemporal expression during development and in maturity. In humans and mice, mature miR-7 is generated from three different genes, illustrating unexpected redundancy and also the importance of this miRNA in regulating key cellular processes. In this review we examine the expanding role of miR-7 in the context of health, with emphasis on organ differentiation and development, as well as in various mammalian diseases, particularly of the brain, heart, endocrine pancreas and skin, as well as in cancer. The more we learn about miR-7, the more we realise the complexity of its regulation and potential functional application both from a biomarker and therapeutic perspective.
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Affiliation(s)
- Jessica L Horsham
- Laboratory for Cancer Medicine, Harry Perkins Institute of Medical Research, The University of Western Australia Centre for Medical Research, Perth, WA 6000, Australia; School of Medicine and Pharmacology, University of Western Australia, Nedlands, WA 6009, Australia
| | - Clarissa Ganda
- Laboratory for Cancer Medicine, Harry Perkins Institute of Medical Research, The University of Western Australia Centre for Medical Research, Perth, WA 6000, Australia
| | - Felicity C Kalinowski
- Laboratory for Cancer Medicine, Harry Perkins Institute of Medical Research, The University of Western Australia Centre for Medical Research, Perth, WA 6000, Australia
| | - Rikki A M Brown
- Laboratory for Cancer Medicine, Harry Perkins Institute of Medical Research, The University of Western Australia Centre for Medical Research, Perth, WA 6000, Australia
| | - Michael R Epis
- Laboratory for Cancer Medicine, Harry Perkins Institute of Medical Research, The University of Western Australia Centre for Medical Research, Perth, WA 6000, Australia
| | - Peter J Leedman
- Laboratory for Cancer Medicine, Harry Perkins Institute of Medical Research, The University of Western Australia Centre for Medical Research, Perth, WA 6000, Australia; School of Medicine and Pharmacology, University of Western Australia, Nedlands, WA 6009, Australia.
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Yu N, Huangyang P, Yang X, Han X, Yan R, Jia H, Shang Y, Sun L. microRNA-7 suppresses the invasive potential of breast cancer cells and sensitizes cells to DNA damages by targeting histone methyltransferase SET8. J Biol Chem 2013; 288:19633-42. [PMID: 23720754 DOI: 10.1074/jbc.m113.475657] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [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: 01/01/2023] Open
Abstract
SET8 (SET domain containing 8) is a histone H4 lysine 20 (H4K20)-specific monomethyltransferase in higher eukaryotes that exerts diverse functions in transcription regulation, DNA repair, tumor metastasis, and genome integrity. The activity of SET8 is tightly controlled during cell cycle through post-translational modifications, including ubiquitination, phosphorylation, and sumoylation. However, how the expression of SET8 is regulated is not fully understood. Here, we report that microRNA-7 is a negative regulator of SET8. We demonstrated that microRNA-7 inhibits H4K20 monomethylation and suppresses epithelial-mesenchymal transition and the invasive potential of breast cancer cells. We showed that microRNA-7 promotes spontaneous DNA damages and sensitizes cells to induced DNA damages. Our experiments provide a molecular mechanism for the regulation of SET8 and extend the biological function of microRNA-7 to DNA damage response, supporting the pursuit of microRNA-7 as a potential target for breast cancer intervention.
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Affiliation(s)
- Na Yu
- Department of Biochemistry and Molecular Biology, Peking University Health Science Center, Beijing 100191, China
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