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      BRD4 inhibition for the treatment of pathological organ fibrosis

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          Abstract

          Fibrosis is defined as excess deposition of extracellular matrix, resulting in tissue scarring and organ dysfunction. It is estimated that 45% of deaths in the developed world are due to fibrosis-induced organ failure. Despite the well-accepted role of fibrosis in the pathogenesis of numerous diseases, there are only two US Food and Drug Administration–approved anti-fibrotic therapies, both of which are currently restricted to the treatment of pulmonary fibrosis. Thus, organ fibrosis represents a massive unmet medical need. Here, we review recent findings suggesting that an epigenetic regulatory protein, BRD4, is a nodal effector of organ fibrosis, and we highlight the potential of small-molecule BRD4 inhibitors for the treatment of diverse fibrotic diseases.

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          Most cited references30

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          Cardiac Fibrosis: The Fibroblast Awakens.

          Myocardial fibrosis is a significant global health problem associated with nearly all forms of heart disease. Cardiac fibroblasts comprise an essential cell type in the heart that is responsible for the homeostasis of the extracellular matrix; however, upon injury, these cells transform to a myofibroblast phenotype and contribute to cardiac fibrosis. This remodeling involves pathological changes that include chamber dilation, cardiomyocyte hypertrophy and apoptosis, and ultimately leads to the progression to heart failure. Despite the critical importance of fibrosis in cardiovascular disease, our limited understanding of the cardiac fibroblast impedes the development of potential therapies that effectively target this cell type and its pathological contribution to disease progression. This review summarizes current knowledge regarding the origins and roles of fibroblasts, mediators and signaling pathways known to influence fibroblast function after myocardial injury, as well as novel therapeutic strategies under investigation to attenuate cardiac fibrosis.
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            Fibrotic disease and the T(H)1/T(H)2 paradigm.

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              NF-κB directs dynamic super enhancer formation in inflammation and atherogenesis.

              Proinflammatory stimuli elicit rapid transcriptional responses via transduced signals to master regulatory transcription factors. To explore the role of chromatin-dependent signal transduction in the atherogenic inflammatory response, we characterized the dynamics, structure, and function of regulatory elements in the activated endothelial cell epigenome. Stimulation with tumor necrosis factor alpha prompted a dramatic and rapid global redistribution of chromatin activators to massive de novo clustered enhancer domains. Inflammatory super enhancers formed by nuclear factor-kappa B accumulate at the expense of immediately decommissioned, basal endothelial super enhancers, despite persistent histone hyperacetylation. Mass action of enhancer factor redistribution causes momentous swings in transcriptional initiation and elongation. A chemical genetic approach reveals a requirement for BET bromodomains in communicating enhancer remodeling to RNA Polymerase II and orchestrating the transition to the inflammatory cell state, demonstrated in activated endothelium and macrophages. BET bromodomain inhibition abrogates super enhancer-mediated inflammatory transcription, atherogenic endothelial responses, and atherosclerosis in vivo.
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                Author and article information

                Journal
                F1000Res
                F1000Res
                F1000Research
                F1000Research
                F1000Research (London, UK )
                2046-1402
                28 June 2017
                2017
                : 6
                : F1000 Faculty Rev-1015
                Affiliations
                [1 ]Department of Medicine, Division of Cardiology and Consortium for Fibrosis Research & Translation, University of Colorado, Anschutz Medical Campus, Aurora, CO, USA
                [2 ]Gladstone Institutes and Department of Medicine, Division of Cardiology, University of California San Francisco School of Medicine, San Francisco, CA, USA
                Author notes

                Competing interests: MSS and TAM declare that they have no competing interests. SMH is a scientific founder and shareholder of Tenava Therapeutics.

                Author information
                http://orcid.org/0000-0001-7778-4470
                Article
                10.12688/f1000research.11339.1
                5497817
                28721198
                1b89546a-a14e-44ac-a95b-6c563f23fa56
                Copyright: © 2017 Stratton MS et al.

                This is an open access article distributed under the terms of the Creative Commons Attribution Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 19 June 2017
                Funding
                Funded by: National Institutes of Health
                Award ID: HL116848
                Funded by: National Institutes of Health
                Award ID: HL127240
                Funded by: National Institutes of Health
                Award ID: 5T32HL007822
                Funded by: National Institutes of Health
                Award ID: F32HL126354
                Funded by: American Heart Association
                Award ID: 16SFRN31400013
                Funded by: National Institutes of Health
                Award ID: DK092821
                TAM was supported by the National Institutes of Health (NIH) (HL116848 and HL127240) and the American Heart Association (16SFRN31400013). SMH was funded by the NIH (HL127240 and DK093821). MSS was supported by a T32 training grant and an F32 fellowship from the NIH (5T32HL007822 and F32HL126354).
                The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript .
                Categories
                Review
                Articles
                Cell Signaling
                Control of Gene Expression
                Extrapulmonary Disorders & Therapeutic Interventions
                Gastrointestinal Pharmacology
                Immunopharmacology & Hematologic Pharmacology
                Interstitial Lung Diseases
                Liver Biology & Pathobiology
                Liver Failure & Liver Disease
                Nuclear Structure & Function
                Pathophysiology of Chronic Kidney Disease (CKD)
                Renal Immunology & Pathology (incl. Glomerular Diseases)
                Renal Pharmacology
                Respiratory Pharmacology

                organ fibrosis,brd4,anti-fibrotic therapies,small molecule brd4 inhibitors,fibrotic diseases

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