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      Anticancer Natural Compounds as Epigenetic Modulators of Gene Expression

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          Abstract

          Abstract: Accumulating evidence shows that hallmarks of cancer include: “genetic and epigenetic alterations leading to inactivation of cancer suppressors, overexpression of oncogenes, deregulation of intracellular signaling cascades, alterations of cancer cell metabolism, failure to undergo cancer cell death, induction of epithelial to mesenchymal transition, invasiveness, metastasis, deregulation of immune response and changes in cancer microenvironment, which underpin cancer development”. Natural compounds as bioactive ingredients isolated from natural sources (plants, fungi, marine life forms) have revolutionized the field of anticancer therapeutics and rapid developments in preclinical studies are encouraging. Natural compounds could affect the epigenetic molecular mechanisms that modulate gene expression, as well as DNA damage and repair mechanisms. The current review will describe the latest achievements in using naturally produced compounds targeting epigenetic regulators and modulators of gene transcription in vitro and in vivo to generate novel anticancer therapeutics.

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          Most cited references462

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          Epigenetics in cancer.

          Epigenetic mechanisms are essential for normal development and maintenance of tissue-specific gene expression patterns in mammals. Disruption of epigenetic processes can lead to altered gene function and malignant cellular transformation. Global changes in the epigenetic landscape are a hallmark of cancer. The initiation and progression of cancer, traditionally seen as a genetic disease, is now realized to involve epigenetic abnormalities along with genetic alterations. Recent advancements in the rapidly evolving field of cancer epigenetics have shown extensive reprogramming of every component of the epigenetic machinery in cancer including DNA methylation, histone modifications, nucleosome positioning and non-coding RNAs, specifically microRNA expression. The reversible nature of epigenetic aberrations has led to the emergence of the promising field of epigenetic therapy, which is already making progress with the recent FDA approval of three epigenetic drugs for cancer treatment. In this review, we discuss the current understanding of alterations in the epigenetic landscape that occur in cancer compared with normal cells, the roles of these changes in cancer initiation and progression, including the cancer stem cell model, and the potential use of this knowledge in designing more effective treatment strategies.
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            The history of cancer epigenetics.

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              Hypomethylation distinguishes genes of some human cancers from their normal counterparts.

              It has been suggested that cancer represents an alteration in DNA, heritable by progeny cells, that leads to abnormally regulated expression of normal cellular genes; DNA alterations such as mutations, rearrangements and changes in methylation have been proposed to have such a role. Because of increasing evidence that DNA methylation is important in gene expression (for review see refs 7, 9-11), several investigators have studied DNA methylation in animal tumours, transformed cells and leukaemia cells in culture. The results of these studies have varied; depending on the techniques and systems used, an increase, decrease, or no change in the degree of methylation has been reported. To our knowledge, however, primary human tumour tissues have not been used in such studies. We have now examined DNA methylation in human cancer with three considerations in mind: (1) the methylation pattern of specific genes, rather than total levels of methylation, was determined; (2) human cancers and adjacent analogous normal tissues, unconditioned by culture media, were analysed; and (3) the cancers were taken from patients who had received neither radiation nor chemotherapy. In four of five patients studied, representing two histological types of cancer, substantial hypomethylation was found in genes of cancer cells compared with their normal counterparts. This hypomethylation was progressive in a metastasis from one of the patients.
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                Author and article information

                Journal
                Curr Genomics
                Curr. Genomics
                CG
                Current Genomics
                Bentham Science Publishers
                1389-2029
                1875-5488
                April 2017
                April 2017
                : 18
                : 2
                : 175-205
                Affiliations
                [1]Head and Neck Cancer Research Division, Department of Otolaryngology/Head and Neck Surgery, The Johns Hopkins School of Medicine, Baltimore, MD 21231, USA
                Author notes
                [* ]Address correspondence to this author at the Head and Neck Cancer Research Division, Cancer Research Building II, 1550 Orleans Street, Baltimore, MD 21231. USA; Tel: 410-491-9802; Fax: 410-614-1411;, E-mail: eratovi1@ 123456jhmi.edu
                Article
                CG-18-175
                10.2174/1389202917666160803165229
                5345332
                28367075
                fb19b50f-9847-47b8-b18b-af1fd71e286e
                © 2017 Bentham Science Publishers

                This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

                History
                : 05 August 2015
                : 24 November 2015
                : 29 November 2015
                Categories
                Article

                Genetics
                chromatin,dna methylation,epigenetics,histone acetylation,histone methylation,microrna,natural compounds,tumorigenesis

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