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Meinag FE, Fatahi M, Vahedian V, Maroufi NF, Mosayyebi B, Ahmadi E, Rahmati M. Modulatory effects of miRNAs in doxorubicin resistance: A mechanistic view. Funct Integr Genomics 2024; 24:150. [PMID: 39222264 DOI: 10.1007/s10142-024-01431-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2023] [Revised: 07/04/2024] [Accepted: 08/20/2024] [Indexed: 09/04/2024]
Abstract
MicroRNAs (miRNAs) are a group of small non-coding RNAs and play an important role in controlling vital biological processes, including cell cycle control, apoptosis, metabolism, and development and differentiation, which lead to various diseases such as neurological, metabolic disorders, and cancer. Chemotherapy consider as gold treatment approaches for cancer patients. However, chemotherapeutic is one of the main challenges in cancer management. Doxorubicin (DOX) is an anti-cancer drug that interferes with the growth and spread of cancer cells. DOX is used to treat various types of cancer, including breast, nervous tissue, bladder, stomach, ovary, thyroid, lung, bone, muscle, joint and soft tissue cancers. Also recently, miRNAs have been identified as master regulators of specific genes responsible for the mechanisms that initiate chemical resistance. miRNAs have a regulatory effect on chemotherapy resistance through the regulation of apoptosis process. Also, the effect of miRNAs p53 gene as a key tumor suppressor was confirmed via studies. miRNAs can affect main biological pathways include PI3K pathway. This review aimed to present the current understanding of the mechanisms and effects of miRNAs on apoptosis, p53 and PTEN/PI3K/Akt signaling pathway related to DOX resistance.
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Affiliation(s)
- Fatemeh Ebadi Meinag
- Department of Biochemistry and Clinical Laboratories, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mina Fatahi
- Immunology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Vahid Vahedian
- Department of Hematology, Transfusion Medicine and Cellular Therapy/Cell Therapy Center (CTC-USP), Clinical Hospital and Cancer Institute (ICESP), Faculty of Medicine, University of Sao Paulo (FMUSP-HC), Sao Paulo, Brazil
- Department of Clinical Medicine, Division of Medical Investigation Laboratory (LIM/31), Pathogenesis and Targeted Therapy in Onco-Immuno-Hematology and Immuno-Oncology, Clinical Hospital, Faculty of Medicine, University of Sao Paulo (FMUSP-HC), Sao Paulo, Brazil
- Comprehensive Center for Translational and Precision Oncology (CTO), SP State Cancer Institute (ICESP), Sao Paulo, Brazil
| | - Nazila Fathi Maroufi
- Department of Biochemistry and Clinical Laboratories, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
| | - Bashir Mosayyebi
- Department of Medical Biotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Elham Ahmadi
- Department of Medical Biotechnology, Faculty of Advanced Medical Sciences, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Mohammad Rahmati
- Department of Biochemistry and Clinical Laboratories, Faculty of Medicine, Tabriz University of Medical Sciences, Tabriz, Iran.
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2
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Panahizadeh R, Vatankhah MA, Safari A, Danesh H, Nazmi N, Gholizadeh P, Soozangar N, Jeddi F. The interplay between microRNAs and Nrf2 signaling in human cancers. Cancer Cell Int 2024; 24:234. [PMID: 38970040 PMCID: PMC11225148 DOI: 10.1186/s12935-024-03430-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2024] [Accepted: 07/02/2024] [Indexed: 07/07/2024] Open
Abstract
MicroRNAs (miRNAs), as a class of nonprotein-coding RNAs, post-transcriptionally regulate the expression of target genes by base pairing to 3'-untranslated regions (3'-UTRs). Nuclear factor E2-related factor 2 (Nrf2) has been identified as a critical component of the antioxidant defense mechanism. Dysregulation is associated with chemoresistance and radioresistance in cancerous cells. MiRNA-mediated regulation of the Nrf2 signaling pathway has been shown to have important implications for the development of various cancers. In this article, we review the roles of miRNAs as regulators of the Nrf2 pathway in different human cancers. Ras-associated binding (Rab) proteins have an essential role regulation of vesicle transport, as well as oncogenic functions in preventing chemotherapy efficacy and cancer development. More importantly, increased evidence indicated that the interaction between miRNAs and Rabs has been determined to play critical roles in cancer therapy. However, the significant limitations in using miRNAs for therapeutic applications include cross-targeting and instability of miRNAs. The detailed aspect of the interaction of miRNAs and Rabs is not clearly understood. In the current review, we highlighted the involvement of these molecules as regulators of the Nrf2 pathway in cancer pathogenesis. Potential methods and several obstacles in developing miRNAs as an anticancer therapy are also mentioned.
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Affiliation(s)
- Reza Panahizadeh
- Zoonoses Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
| | | | - Ali Safari
- Zoonoses Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Hesam Danesh
- Department of Orthopedics, Shohada Hospital, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Negin Nazmi
- School of Medicine, Islamic Azad University, Ardabil, Iran
| | - Pourya Gholizadeh
- Zoonoses Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
- Digestive Disease Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Narges Soozangar
- Zoonoses Research Center, Ardabil University of Medical Sciences, Ardabil, Iran.
- Digestive Disease Research Center, Ardabil University of Medical Sciences, Ardabil, Iran.
| | - Farhad Jeddi
- Department of Genetics and Pathology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran.
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3
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Taheri M, Mahmud Hussen B, Tondro Anamag F, Shoorei H, Dinger ME, Ghafouri-Fard S. The role of miRNAs and lncRNAs in conferring resistance to doxorubicin. J Drug Target 2021; 30:1-21. [PMID: 33788650 DOI: 10.1080/1061186x.2021.1909052] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Doxorubicin is a chemotherapeutic agent that inhibits topoisomerase II, intercalates within DNA base pairs and results in oxidative DNA damage, thus inducing cell apoptosis. Although it is effective in the treatment of a wide range of human cancers, the emergence of resistance to this drug can increase tumour growth and impact patients' survival. Numerous molecular mechanisms and signalling pathways have been identified that induce resistance to doxorubicin via stimulation of cell proliferation, cell cycle switch and preclusion of apoptosis. A number of microRNAs (miRNAs) and long non-coding RNAs (lncRNAs) have also been identified that alter sensitivity to doxorubicin. Understanding the particular impact of these non-coding RNAs in conferring resistance to doxorubicin has considerable potential to improve selection of chemotherapeutic regimens for cancer patients. Moreover, modulation of expression of these transcripts is a putative strategy for combating resistance. In the current paper, the influence of miRNAs and lncRNAs in the modification of resistance to doxorubicin is discussed.
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Affiliation(s)
- Mohammad Taheri
- Urology and Nephrology Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Bashdar Mahmud Hussen
- Department of Pharmacognosy, College of Pharmacy, Hawler Medical University, Erbil, Iraq
| | | | - Hamed Shoorei
- Department of Anatomical Sciences, Faculty of Medicine, Birjand University of Medical Sciences, Birjand, Iran
| | - Marcel E Dinger
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW, Australia
| | - Soudeh Ghafouri-Fard
- Department of Medical Genetics, Shahid Beheshti University of Medical Sciences, Tehran, Iran
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4
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Du H, Bao Y, Liu C, Zhong A, Niu Y, Tang X. miR‑139‑5p enhances cisplatin sensitivity in non‑small cell lung cancer cells by inhibiting cell proliferation and promoting apoptosis via the targeting of Homeobox protein Hox‑B2. Mol Med Rep 2021; 23:104. [PMID: 33300085 PMCID: PMC7723155 DOI: 10.3892/mmr.2020.11743] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 08/14/2020] [Indexed: 02/07/2023] Open
Abstract
The development of chemotherapeutic dug resistance hinders the clinical treatment of cancer. MicroRNAs (miRNAs/miRs) have been revealed to serve essential roles in the drug resistance of numerous types of cancer. miR‑139‑5p was previously reported to be associated with cisplatin (DDP) sensitivity in human nasopharyngeal carcinoma cells and colorectal cancer cells. However, the effect and underlying mechanism of miR‑139‑5p in DDP sensitivity in non‑small cell lung cancer (NSCLC) cells has not yet been fully elucidated. In the present study, the expression of miR‑139‑5p and Homeobox protein Hox‑B2 (HOXB2) in NSCLC tissues was examined by reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR) and western blotting. Subsequently, the effect of miR‑139‑5p on the DDP sensitivity of NSCLC cells in vitro was investigated. Cell proliferation was examined using a Cell Counting Kit‑8 assay. Western blotting was used to evaluate the protein expression of HOXB2, phosphorylated (p)‑PI3K, p‑AKT, caspase‑3 and cleaved‑caspase‑3, and RT‑qPCR was used to evaluate the expression of miR‑139‑5p, and the mRNA expression levels of HOXB2, PI3K, AKT and caspase‑3. The apoptotic rate of the cells was detected using flow cytometry. miR‑139‑5p expression in NSCLC tissues was shown to be significantly lower compared with that in adjacent tissues. Additionally, miR‑139‑5p increased cell apoptosis and inhibited NSCLC cell proliferation induced by DDP in vitro via modulating the PI3K/AKT/caspase‑3 signaling pathway. Furthermore, HOXB2 was identified to be a target of miR‑139‑5p, and miR‑139‑5p was revealed to sensitize NSCLC cells to DDP via the targeting of HOXB2. Taken together, the results of the present study demonstrated that regulating the expression of miR‑139‑5p could provide a novel approach to reverse DDP resistance and increase chemosensitivity in the treatment of NSCLC.
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Affiliation(s)
- Hailian Du
- Department of Respiratory Medicine, Weifang Yidu Central Hospital, Weifang, Shandong 262500, P.R. China
| | - Ya'nan Bao
- Department of Thoracic Surgery, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650000, P.R. China
| | - Chunying Liu
- Ultrasonic Department, Anqiu People's Hospital, Anqiu, Shandong 262100, P.R. China
| | - Anqiao Zhong
- Department of Respiratory Medicine, Weifang Yidu Central Hospital, Weifang, Shandong 262500, P.R. China
| | - Yikai Niu
- Department of Respiratory Medicine, Weifang Yidu Central Hospital, Weifang, Shandong 262500, P.R. China
| | - Xingping Tang
- Department of Respiratory Medicine, Weifang Yidu Central Hospital, Weifang, Shandong 262500, P.R. China
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Peng B, Theng PY, Le MTN. Essential functions of miR-125b in cancer. Cell Prolif 2020; 54:e12913. [PMID: 33332677 PMCID: PMC7848968 DOI: 10.1111/cpr.12913] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 08/20/2020] [Accepted: 09/07/2020] [Indexed: 12/14/2022] Open
Abstract
MicroRNAs (miRNAs) are small and highly conserved non-coding RNAs that silence target mRNAs, and compelling evidence suggests that they play an essential role in the pathogenesis of human diseases, especially cancer. miR-125b, which is the mammalian orthologue of the first discovered miRNA lin-4 in Caenorhabditis elegans, is one of the most important miRNAs that regulate various physiological and pathological processes. The role of miR-125b in many types of cancer has been well established, and so here we review the current knowledge of how miR-125b is deregulated in different types of cancer; its oncogenic and/or tumour-suppressive roles in tumourigenesis and cancer progression; and its regulation with regard to treatment response, all of which are underlined in multiple studies. The emerging information that elucidates the essential functions of miR-125b might help support its potentiality as a diagnostic and prognostic biomarker as well as an effective therapeutic tool against cancer.
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Affiliation(s)
- Boya Peng
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Department of Biomedical Sciences, School of Veterinary Medicine and Life Sciences, City University of Hong Kong, Kowloon, Hong Kong.,N.1 Institute for Health, National University of Singapore, Singapore, Singapore
| | - Poh Ying Theng
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Minh T N Le
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore.,Department of Biomedical Sciences, School of Veterinary Medicine and Life Sciences, City University of Hong Kong, Kowloon, Hong Kong.,N.1 Institute for Health, National University of Singapore, Singapore, Singapore.,City University of Hong Kong Shenzhen Research Institute, Shenzhen, China
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Wen X, Li S, Guo M, Liao H, Chen Y, Kuang X, Liao X, Ma L, Li Q. miR-181a-5p inhibits the proliferation and invasion of drug-resistant glioblastoma cells by targeting F-box protein 11 expression. Oncol Lett 2020; 20:235. [PMID: 32968457 PMCID: PMC7500031 DOI: 10.3892/ol.2020.12098] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Accepted: 08/04/2020] [Indexed: 12/17/2022] Open
Abstract
Glioblastoma (GBM) is the most common malignant primary tumor in the human central nervous system. The present study aimed to explore the molecular mechanism by which microRNA (miR)-181a-5p targets the F-box protein 11 (FBXO11) in glioma cells to inhibit cell proliferation and invasion. Reverse transcription-quantitative (RT-q)PCR was performed to detect the expression levels of miR-181a-5p in U251TR cells, U251 cells, primary GBM tissues and relapsed GBM tissues in order to determine the association between miR-181a-5p and the chemoresistance of GBM cells. The expression levels of miR-181a-5p in GBM cells were modulated via transfecting miR-181a-5p mimics and inhibitors. Cell Counting Kit-8 assays were undertaken to assess the effects of miR-181a-5p on drug sensitivity and proliferation of GBM cells. Wound healing assays were performed to examine the effects of miR-181a-5p on the migratory ability of GBM cells. Furthermore, the effects of miR-181a-5p on the invasive ability of GBM cells were analyzed using an in vitro invasion assay. Flow cytometry analysis was carried out to determine whether overexpression of miR-181a-5p can promote the apoptotic rate of GBM cells. RT-qPCR and western blotting were employed to detect the effects of miR-181a-5p on mRNA and protein expression of FBX011. miR-181a-5p exhibited low expression in resistant GBM cell lines and recurrent tumor tissues. Dual-luciferase reporter assays were utilized to detect luciferase activity to verify the targeted regulatory association between miR-181a-5p and FBXO11. Upregulation of miR-181a-5p promoted the sensitivity of GBM cells to temozolomide (TMZ), increased the apoptotic rate of GBM cells and significantly inhibited the invasive and migratory capacities of GBM cells. In drug-resistant glioma cells, compared with the miR-negative control group and the blank group, the expression of miR-181a-5p was significantly upregulated (P<0.01), while the expression of FBXO11 protein was downregulated. miR-181a-5p increased the sensitivity of GBM cells to TMZ. miR-181a-5p significantly inhibited the migratory and invasive capacities of GBM cells. miR-181a-5p may become a novel effective target for the treatment of GBM. The results of dual-luciferase reporter assays indicated that miR-181a-5p could target the 3′-untranslated region of FBXO11. The underlying mechanism may be targeted inhibition of FBXO11 gene expression, or may be associated with apoptosis.
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Affiliation(s)
- Xueyan Wen
- Department of Neurology, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570102, P.R. China.,Key Laboratory of Brain Science Research and Transformation in Tropical Environment of Hainan Province, Haikou, Hainan 571199, P.R. China.,Department of Neurosurgery, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi 541001, P.R. China
| | - Songrong Li
- Department of Neurology, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570102, P.R. China.,Key Laboratory of Brain Science Research and Transformation in Tropical Environment of Hainan Province, Haikou, Hainan 571199, P.R. China
| | - Mengchan Guo
- Department of Neurology, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570102, P.R. China.,Key Laboratory of Brain Science Research and Transformation in Tropical Environment of Hainan Province, Haikou, Hainan 571199, P.R. China
| | - Hongzhan Liao
- Department of Neurology, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570102, P.R. China.,Key Laboratory of Brain Science Research and Transformation in Tropical Environment of Hainan Province, Haikou, Hainan 571199, P.R. China.,Department of Neurosurgery, Affiliated Hospital of Guilin Medical University, Guilin, Guangxi 541001, P.R. China
| | - Yongmin Chen
- Department of Neurology, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570102, P.R. China.,Key Laboratory of Brain Science Research and Transformation in Tropical Environment of Hainan Province, Haikou, Hainan 571199, P.R. China
| | - Xi Kuang
- Department of Neurology, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570102, P.R. China.,Key Laboratory of Brain Science Research and Transformation in Tropical Environment of Hainan Province, Haikou, Hainan 571199, P.R. China
| | - Xiaoping Liao
- Department of Neurology, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570102, P.R. China.,Key Laboratory of Brain Science Research and Transformation in Tropical Environment of Hainan Province, Haikou, Hainan 571199, P.R. China
| | - Lin Ma
- Department of Neurology, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570102, P.R. China.,Key Laboratory of Brain Science Research and Transformation in Tropical Environment of Hainan Province, Haikou, Hainan 571199, P.R. China
| | - Qifu Li
- Department of Neurology, The First Affiliated Hospital of Hainan Medical University, Haikou, Hainan 570102, P.R. China.,Key Laboratory of Brain Science Research and Transformation in Tropical Environment of Hainan Province, Haikou, Hainan 571199, P.R. China
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Ayers D, Vandesompele J. Influence of microRNAs and Long Non-Coding RNAs in Cancer Chemoresistance. Genes (Basel) 2017; 8:genes8030095. [PMID: 28273813 PMCID: PMC5368699 DOI: 10.3390/genes8030095] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 02/15/2017] [Accepted: 02/24/2017] [Indexed: 12/16/2022] Open
Abstract
Innate and acquired chemoresistance exhibited by most tumours exposed to conventional chemotherapeutic agents account for the majority of relapse cases in cancer patients. Such chemoresistance phenotypes are of a multi-factorial nature from multiple key molecular players. The discovery of the RNA interference pathway in 1998 and the widespread gene regulatory influences exerted by microRNAs (miRNAs) and other non-coding RNAs have certainly expanded the level of intricacy present for the development of any single physiological phenotype, including cancer chemoresistance. This review article focuses on the latest research efforts in identifying and validating specific key molecular players from the two main families of non-coding RNAs, namely miRNAs and long non-coding RNAs (lncRNAs), having direct or indirect influences in the development of cancer drug resistance properties and how such knowledge can be utilised for novel theranostics in oncology.
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Affiliation(s)
- Duncan Ayers
- Centre for Molecular Medicine and Biobanking, University of Malta, Msida MSD2080, Malta.
- Faculty of Biology, Medicine and Health, The University of Manchester, Manchester M1 7DN, UK.
| | - Jo Vandesompele
- Center for Medical Genetics Ghent, Ghent University, Ghent 9000, Belgium.
- Cancer Research Institute Ghent (CRIG), Ghent University, Ghent 9000, Belgium.
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Abstract
Cancer cachexia is a paraneoplastic syndrome compromising quality of life and survival, mainly characterized by involuntary weight loss, fatigue, and systemic inflammation. The syndrome is described as a result of tumor-host interactions characterized by an inflammatory response by the host to the presence of the tumor. Indeed, systemic inflammation is considered a pivotal feature in cachexia progression and maintenance. Cytokines are intimately related to chronic systemic inflammation and the mechanisms underlying the release of these factors are not totally elucidated, the etiology of cachexia being still not fully understood. Therefore, the understanding of cachexia-related mechanisms, as well as the establishment of markers for the syndrome, is very relevant. MicroRNAs (miRNAs) are a class of noncoding RNAs interfering with gene regulation. Different miRNA expression profiles are associated with different diseases and inflammatory processes. miRNAs modulate adipose and skeletal muscle tissue metabolism in cancer cachexia and also tumor and tissue derived inflammation. Therefore, we propose a possible role for miRNAs in the modulation of the host inflammatory response during cachexia. Moreover, the establishment of a robust body of evidence in regard to miRNAs and the mechanisms underlying cachexia is mandatory, and shall contribute to the improvement of its diagnosis and treatment.
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miRNA Influences in NRF2 Pathway Interactions within Cancer Models. J Nucleic Acids 2015; 2015:143636. [PMID: 26345522 PMCID: PMC4546755 DOI: 10.1155/2015/143636] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2015] [Revised: 07/24/2015] [Accepted: 07/27/2015] [Indexed: 11/25/2022] Open
Abstract
The NRF2 transcription factor (nuclear factor-erythroid 2 p45-related factor 2) has been identified as a key molecular player in orchestrating adaptive cellular interactions following a wide spectrum of cellular stress conditions that could be either extracellular or intracellular. Dysregulation of the NRF2 system is implicated in various disease states, including inflammatory conditions. The NRF2 transcription factor is also known to permit cross talk with several other essential cellular signaling pathways. Recent literature has also elucidated the potential influences of miRNA activity over modulations of the NRF2 signalling network. Consequently, further delving into the knowledge regarding the extent of miRNA-induced epigenetic gene regulatory control on key elements of the NRF2 signalling pathway and its cross talk, particularly within the context of cancer models, can prove to be of high clinical importance. This is so since such miRNAs, once identified and validated, can be potentially exploited as novel drug targets for emerging translational medicine-based therapies.
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