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Hund AC, Lockmann A, Schön MP. Mutually enhancing anti-inflammatory activities of dimethyl fumarate and NF-κB inhibitors--implications for dose-sparing combination therapies. Exp Dermatol 2016; 25:124-30. [PMID: 26513635 DOI: 10.1111/exd.12892] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/15/2015] [Indexed: 12/20/2022]
Abstract
Fumaric acid esters, dimethyl fumarate (DMF) in particular, have been established for the therapy of psoriasis and, more recently, multiple sclerosis. In the light of therapy-limiting dose-dependent side effects, such as gastrointestinal irritation, reducing the effective doses of FAE is a worthwhile goal. In search of strategies to maintain the anti-inflammatory activity of DMF at reduced concentrations, we found that NF-κB inhibition augmented key anti-inflammatory effects of DMF in two complementary experimental settings in vitro. At non-toxic concentrations, both proteasome inhibition with bortezomib as well as blocking NF-κB activation through KINK-1, a small molecule inhibitor of IKKβ-profoundly enhanced DMF-dependent inhibition of nuclear NF-κB translocation in TNFα-stimulated human endothelial cells. This resulted in significant and selective co-operative down-regulation of endothelial adhesion molecules crucial for leucocyte extravasation, namely E-selectin (CD62E), VCAM-1 (CD106) and ICAM-1 (CD54), on both mRNA and protein levels. Functionally, these molecular changes led to synergistically decreased rolling and firm adhesion of human lymphocytes on TNF-activated endothelial cells, as demonstrated in a dynamic flow chamber system. If our in vitro findings can be translated into clinical settings, it is conceivable that anti-inflammatory effects of DMF can be achieved with lower doses than currently used, thus potentially reducing unwanted side effects.
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Affiliation(s)
- Anna-Carina Hund
- Department of Dermatology, Venereology and Allergology, Georg August University, Göttingen, Germany
| | - Anike Lockmann
- Department of Dermatology, Venereology and Allergology, Georg August University, Göttingen, Germany
| | - Michael P Schön
- Department of Dermatology, Venereology and Allergology, Georg August University, Göttingen, Germany
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202
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Bittner S, Wiendl H. Neuroimmunotherapies Targeting T Cells: From Pathophysiology to Therapeutic Applications. Neurotherapeutics 2016; 13:4-19. [PMID: 26563391 PMCID: PMC4720668 DOI: 10.1007/s13311-015-0405-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
Therapeutic options for multiple sclerosis (MS) have significantly increased over the last few years. T lymphocytes are considered to play a central role in initiating and perpetuating the pathological immune response. Currently approved therapies for MS target T lymphocytes, either in an unspecific manner or directly by interference with specific T-cell pathways. While the concept of "T-cell-specific therapy" implies specificity and selectivity, currently approved approaches come from a general shaping of the immune system towards anti-inflammatory immune responses by non-T-cell-selective immune suppression or immune modulation (e.g., interferons-immune modulation approach) to a depletion of immune cell populations involving T cells (e.g., anti-CD52, alemtuzumab-immune selective depletion approach), or a selective inhibition of distinct molecular pathways in order to sequester leucocytes (e.g., natalizumab-leukocyte sequestration approach). This review will highlight the rationale and results of different T-cell-directed therapeutic approaches coming from basic animal experiments to clinical trials. We will first discuss the pathophysiological rationale for targeting T lymphocytes in MS leading to currently approved treatments acting on T lymphocytes. Furthermore, we will disuss previous promising concepts that have failed to show efficacy in clinical trials or were halted as a result of unexpected adverse events. Learning from the discrepancies between expectations and failures in practical outcomes helps to optimize future research approaches and clinical study designs. As our current view of MS pathogenesis and patient needs is rapidly evolving, novel therapeutic approaches targeting T lymphocytes will also be discussed, including specific molecular interventions such as cytokine-directed treatments or strategies enhancing immunoregulatory mechanisms. Based on clinical experience and novel pathophysiological approaches, T-cell-based strategies will remain a pillarstone of MS therapy.
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Affiliation(s)
- Stefan Bittner
- Department of Neurology, University Medical Center of the Johannes Gutenberg-University Mainz, Mainz, Germany
- Department of Neurology, University of Münster, Münster, Germany
| | - Heinz Wiendl
- Department of Neurology, University of Münster, Münster, Germany.
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Abstract
The transcription factor Nrf2 (nuclear factor erythroid 2-related factor 2) is a major regulator of oxidative stress defence in the human body. As Nrf2 regulates the expression of a large battery of cytoprotective genes, it plays a crucial role in the prevention of degenerative disease in multiple organs. Thus it has been the focus of research as a pharmacological target that could be used for prevention and treatment of chronic diseases such as multiple sclerosis, chronic kidney disease or cardiovascular diseases. The present review summarizes promising findings from basic research and shows which Nrf2-targeting therapies are currently being investigated in clinical trials and which agents have already entered clinical practice.
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204
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Cho H, Hartsock MJ, Xu Z, He M, Duh EJ. Monomethyl fumarate promotes Nrf2-dependent neuroprotection in retinal ischemia-reperfusion. J Neuroinflammation 2015; 12:239. [PMID: 26689280 PMCID: PMC4687295 DOI: 10.1186/s12974-015-0452-z] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 12/04/2015] [Indexed: 12/15/2022] Open
Abstract
Background Retinal ischemia results in neuronal degeneration and contributes to the pathogenesis of multiple blinding diseases. Recently, the fumaric acid ester dimethyl fumarate (DMF) has been FDA-approved for the treatment of multiple sclerosis, based on its neuroprotective and anti-inflammatory effects. Its potential role as a neuroprotective agent for retinal diseases has received little attention. In addition, DMF’s mode of action remains elusive, although studies have suggested nuclear factor erythroid 2-related factor 2 (Nrf2) activation as an important mechanism. Here we investigated the neuroprotective role of monomethyl fumarate (MMF), the biologically active metabolite of DMF, in retinal ischemia-reperfusion (I/R) injury, and examined the role of Nrf2 in mediating MMF action. Methods Wild-type C57BL/6J and Nrf2 knockout (KO) mice were subjected to 90 min of retinal ischemia followed by reperfusion. Mice received daily intraperitoneal injection of MMF. Inflammatory gene expression was measured using quantitative reverse transcription PCR (qRT-PCR) at 48 h after I/R injury. Seven days after I/R, qRT-PCR for Nrf2 target gene expression, immunostaining for Müller cell gliosis and cell loss in the ganglion cell layer (GCL), and electroretinography for retinal function were performed. Results The results of this study confirmed that MMF reduces retinal neurodegeneration in an Nrf2-dependent manner. MMF treatment significantly increased the expression of Nrf2-regulated antioxidative genes, suppressed inflammatory gene expression, reduced Müller cell gliosis, decreased neuronal cell loss in the GCL, and improved retinal function measured by electroretinogram (ERG) after retinal I/R injury in wild-type mice. Importantly, these MMF-mediated beneficial effects were not observed in Nrf2 KO mice. Conclusions These results indicate that fumaric acid esters (FAEs) exert a neuronal protective function in the retinal I/R model and further validate Nrf2 modulation as a major mode of action of FAEs. This suggests that DMF and FAEs could be a potential therapeutic agent for activation of the Nrf2 pathway in retinal and possibly systemic diseases. Electronic supplementary material The online version of this article (doi:10.1186/s12974-015-0452-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Hongkwan Cho
- Department of Ophthalmology, Johns Hopkins University School of Medicine, 400 N. Broadway, Baltimore, MD, 21287, USA.
| | - Matthew J Hartsock
- Department of Ophthalmology, Johns Hopkins University School of Medicine, 400 N. Broadway, Baltimore, MD, 21287, USA.
| | - Zhenhua Xu
- Department of Ophthalmology, Johns Hopkins University School of Medicine, 400 N. Broadway, Baltimore, MD, 21287, USA.
| | - Meihua He
- Department of Ophthalmology, Johns Hopkins University School of Medicine, 400 N. Broadway, Baltimore, MD, 21287, USA.
| | - Elia J Duh
- Department of Ophthalmology, Johns Hopkins University School of Medicine, 400 N. Broadway, Baltimore, MD, 21287, USA.
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205
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Claes N, Fraussen J, Stinissen P, Hupperts R, Somers V. B Cells Are Multifunctional Players in Multiple Sclerosis Pathogenesis: Insights from Therapeutic Interventions. Front Immunol 2015; 6:642. [PMID: 26734009 PMCID: PMC4685142 DOI: 10.3389/fimmu.2015.00642] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Accepted: 12/07/2015] [Indexed: 01/07/2023] Open
Abstract
Multiple sclerosis (MS) is a severe disease of the central nervous system (CNS) characterized by autoimmune inflammation and neurodegeneration. Historically, damage to the CNS was thought to be mediated predominantly by activated pro-inflammatory T cells. B cell involvement in the pathogenesis of MS was solely attributed to autoantibody production. The first clues for the involvement of antibody-independent B cell functions in MS pathology came from positive results in clinical trials of the B cell-depleting treatment rituximab in patients with relapsing-remitting (RR) MS. The survival of antibody-secreting plasma cells and decrease in T cell numbers indicated the importance of other B cell functions in MS such as antigen presentation, costimulation, and cytokine production. Rituximab provided us with an example of how clinical trials can lead to new research opportunities concerning B cell biology. Moreover, analysis of the antibody-independent B cell functions in MS has gained interest since these trials. Limited information is present on the effects of current immunomodulatory therapies on B cell functions, although effects of both first-line (interferon, glatiramer acetate, dimethyl fumarate, and teriflunomide), second-line (fingolimod, natalizumab), and even third-line (monoclonal antibody therapies) treatments on B cell subtype distribution, expression of functional surface markers, and secretion of different cytokines by B cells have been studied to some extent. In this review, we summarize the effects of different MS-related treatments on B cell functions that have been described up to now in order to find new research opportunities and contribute to the understanding of the pathogenesis of MS.
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Affiliation(s)
- Nele Claes
- Hasselt University, Biomedical Research Institute and Transnationale Universiteit Limburg, School of Life Sciences , Diepenbeek , Belgium
| | - Judith Fraussen
- Hasselt University, Biomedical Research Institute and Transnationale Universiteit Limburg, School of Life Sciences , Diepenbeek , Belgium
| | - Piet Stinissen
- Hasselt University, Biomedical Research Institute and Transnationale Universiteit Limburg, School of Life Sciences , Diepenbeek , Belgium
| | - Raymond Hupperts
- Department of Neuroscience, School of Mental Health and Neuroscience, Maastricht University, Maastricht, Netherlands; Department of Neurology, Academic MS Center Limburg, Zuyderland Medisch Centrum, Sittard, Netherlands
| | - Veerle Somers
- Hasselt University, Biomedical Research Institute and Transnationale Universiteit Limburg, School of Life Sciences , Diepenbeek , Belgium
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Dao VTV, Casas AI, Maghzal GJ, Seredenina T, Kaludercic N, Robledinos-Anton N, Di Lisa F, Stocker R, Ghezzi P, Jaquet V, Cuadrado A, Schmidt HH. Pharmacology and Clinical Drug Candidates in Redox Medicine. Antioxid Redox Signal 2015; 23:1113-29. [PMID: 26415051 PMCID: PMC4657508 DOI: 10.1089/ars.2015.6430] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
SIGNIFICANCE Oxidative stress is suggested to be a disease mechanism common to a wide range of disorders affecting human health. However, so far, the pharmacotherapeutic exploitation of this, for example, based on chemical scavenging of pro-oxidant molecules, has been unsuccessful. RECENT ADVANCES An alternative emerging approach is to target the enzymatic sources of disease-relevant oxidative stress. Several such enzymes and isoforms have been identified and linked to different pathologies. For some targets, the respective pharmacology is quite advanced, that is, up to late-stage clinical development or even on the market; for others, drugs are already in clinical use, although not for indications based on oxidative stress, and repurposing seems to be a viable option. CRITICAL ISSUES For all other targets, reliable preclinical validation and drug ability are key factors for any translation into the clinic. In this study, specific pharmacological agents with optimal pharmacokinetic profiles are still lacking. Moreover, these enzymes also serve largely unknown physiological functions and their inhibition may lead to unwanted side effects. FUTURE DIRECTIONS The current promising data based on new targets, drugs, and drug repurposing are mainly a result of academic efforts. With the availability of optimized compounds and coordinated efforts from academia and industry scientists, unambiguous validation and translation into proof-of-principle studies seem achievable in the very near future, possibly leading towards a new era of redox medicine.
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Affiliation(s)
- V. Thao-Vi Dao
- Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, the Netherlands
| | - Ana I. Casas
- Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, the Netherlands
| | - Ghassan J. Maghzal
- Victor Chang Cardiac Research Institute, and School of Medical Sciences, University of New South Wales, Sydney, Australia
| | - Tamara Seredenina
- Department of Pathology and Immunology, Medical School, University of Geneva, Geneva, Switzerland
| | | | - Natalia Robledinos-Anton
- Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), ISCIII, Madrid, Spain
- Instituto de Investigaciones Biomédicas “Alberto Sols” UAM-CSIC, Madrid, Spain
- Instituto de Investigación Sanitaria La Paz (IdiPaz), Madrid, Spain
- Department of Biochemistry, Faculty of Medicine, Autonomous University of Madrid, Madrid, Spain
| | - Fabio Di Lisa
- Neuroscience Institute, CNR, Padova, Italy
- Department of Biomedical Sciences, University of Padova, Padova, Italy
| | - Roland Stocker
- Victor Chang Cardiac Research Institute, and School of Medical Sciences, University of New South Wales, Sydney, Australia
| | - Pietro Ghezzi
- Division of Clinical and Laboratory Investigation, Brighton and Sussex Medical School, Brighton, United Kingdom
| | - Vincent Jaquet
- Department of Pathology and Immunology, Medical School, University of Geneva, Geneva, Switzerland
| | - Antonio Cuadrado
- Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), ISCIII, Madrid, Spain
- Instituto de Investigaciones Biomédicas “Alberto Sols” UAM-CSIC, Madrid, Spain
- Instituto de Investigación Sanitaria La Paz (IdiPaz), Madrid, Spain
- Department of Biochemistry, Faculty of Medicine, Autonomous University of Madrid, Madrid, Spain
| | - Harald H.H.W. Schmidt
- Cardiovascular Research Institute Maastricht (CARIM), Maastricht University, Maastricht, the Netherlands
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208
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Schmidt HHHW, Stocker R, Vollbracht C, Paulsen G, Riley D, Daiber A, Cuadrado A. Antioxidants in Translational Medicine. Antioxid Redox Signal 2015; 23:1130-43. [PMID: 26154592 PMCID: PMC4657516 DOI: 10.1089/ars.2015.6393] [Citation(s) in RCA: 180] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
SIGNIFICANCE It is generally accepted that reactive oxygen species (ROS) scavenging molecules or antioxidants exert health-promoting effects and thus their consumption as food additives and nutraceuticals has been greatly encouraged. Antioxidants may be beneficial in situations of subclinical deficiency and increased demand or acutely upon high-dose infusion. However, to date, there is little clinical evidence for the long-term benefit of most antioxidants. Alarmingly, recent evidence points even to health risks, in particular for supplements of lipophilic antioxidants. RECENT ADVANCES The biological impact of ROS depends not only on their quantities but also on their chemical nature, (sub)cellular and tissue location, and the rates of their formation and degradation. Moreover, ROS serve important physiological functions; thus, inappropriate removal of ROS may cause paradoxical reductive stress and thereby induce or promote disease. CRITICAL ISSUES Any recommendation on antioxidants must be based on solid clinical evidence and patient-relevant outcomes rather than surrogate parameters. FUTURE DIRECTIONS Such evidence-based use may include site-directed application, time-limited high dosing, (functional) pharmacological repair of oxidized biomolecules, and triggers of endogenous antioxidant response systems. Ideally, these approaches need guidance by patient stratification through predictive biomarkers and possibly imaging modalities.
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Affiliation(s)
- Harald H H W Schmidt
- 1 Department of Pharmacology, CARIM, FHML, MIAS, Maastricht University , Maastricht, The Netherlands
| | - Roland Stocker
- 2 Victor Chang Cardiac Research Institute , Sydney, Australia .,3 University of New South Wales , Sydney, Australia
| | - Claudia Vollbracht
- 4 Hochschule Fresenius, University of Applied Sciences , Idstein, Germany
| | | | - Dennis Riley
- 6 Galera Therapeutics Inc., Malvern, Pennsylvania
| | - Andreas Daiber
- 7 Labor für Molekulare Kardiologie, II. Medizinische Klinik und Poliklinik, Universitätsmedizin der Johannes Gutenberg-Universität , Mainz, Germany
| | - Antonio Cuadrado
- 8 Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED) , ISCIII, Madrid, Spain .,9 Instituto de Investigaciones Biomédicas "Alberto Sols" UAM-CSIC , Madrid, Spain .,10 Instituto de Investigación Sanitaria La Paz (IdiPaz) , Madrid, Spain .,11 Department of Biochemistry, Faculty of Medicine, Autonomous University of Madrid , Madrid, Spain
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Ziemssen T, De Stefano N, Sormani MP, Van Wijmeersch B, Wiendl H, Kieseier BC. Optimizing therapy early in multiple sclerosis: An evidence-based view. Mult Scler Relat Disord 2015; 4:460-469. [DOI: 10.1016/j.msard.2015.07.007] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Revised: 06/01/2015] [Accepted: 07/15/2015] [Indexed: 01/26/2023]
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Molecular mechanisms of Nrf2 regulation and how these influence chemical modulation for disease intervention. Biochem Soc Trans 2015; 43:680-6. [PMID: 26551712 PMCID: PMC4613518 DOI: 10.1042/bst20150020] [Citation(s) in RCA: 121] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Indexed: 11/17/2022]
Abstract
Nrf2 (nuclear factor erytheroid-derived-2-like 2) transcriptional programmes are activated by a variety of cellular stress conditions to maintain cellular homoeostasis. Under non-stress conditions, Nrf2 is under tight regulation by the ubiquitin proteasome system (UPS). Detailed mechanistic investigations have shown the Kelch-like ECH-associated protein 1 (Keap1)-cullin3 (Cul3)-ring-box1 (Rbx1) E3-ligase to be the primary Nrf2 regulatory system. Recently, both beta-transducin repeat-containing E3 ubiquitin protein ligase (β-TrCP) and E3 ubiquitin-protein ligase synoviolin (Hrd1) have been identified as novel E3 ubiquitin ligases that negatively regulate Nrf2 through Keap1-independent mechanisms. In addition to UPS-mediated regulation of Nrf2, investigations have revealed a cross-talk between Nrf2 and the autophagic pathway resulting in activation of Nrf2 in a non-canonical manner. In addition to regulation at the protein level, Nrf2 was recently shown to be regulated at the transcriptional level by oncogenic K-rat sarcoma (Ras). A consequence of these differential regulatory mechanisms is the dual role of Nrf2 in cancer: the canonical, protective role and the non-canonical 'dark-side' of Nrf2. Based on the protective role of Nrf2, a vast effort has been dedicated towards identifying novel chemical inducers of Nrf2 for the purpose of chemoprevention. On the other hand, upon malignant transformation, some cancer cells have a constitutively high level of Nrf2 offering a growth advantage, as well as rendering cancer cells resistant to chemotherapeutics. This discovery has led to a new paradigm in cancer treatment; the initially counterintuitive use of Nrf2 inhibitors as adjuvants in chemotherapy. Herein, we will discuss the mechanisms of Nrf2 regulation and how this detailed molecular understanding can be leveraged to develop Nrf2 modulators to prevent diseases, mitigate disease progression or overcome chemoresistance.
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211
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D’Amico E, Leone C, Caserta C, Patti F. Oral drugs in multiple sclerosis therapy: an overview and a critical appraisal. Expert Rev Neurother 2015; 15:803-24. [DOI: 10.1586/14737175.2015.1058162] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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212
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Nielsen AS. Advances in the management of relapsing-remitting multiple sclerosis: role of oral dimethyl fumarate (BG-12). Degener Neurol Neuromuscul Dis 2015; 5:51-61. [PMID: 32669912 PMCID: PMC7337155 DOI: 10.2147/dnnd.s68723] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Accepted: 04/23/2015] [Indexed: 12/30/2022] Open
Abstract
Multiple sclerosis is a complex and chronic inflammatory disease of the central nervous system which affects an estimated 2.3 million individuals worldwide. Genetic research has uncovered over 100 immune-related genes associated with the disease and has provided a multitude of potential therapeutic targets. To date, 13 US Food and Drug Administration-approved disease-modifying therapies designed to influence the aberrant immune system are available for the indication of relapsing forms of the disease. BG-12 is a novel oral multiple sclerosis therapeutic with a unique putative mechanism of action that activates the Nrf2 anti-oxidant pathway. Despite the enthusiasm for multiple therapeutic options, including oral options, the practitioner is faced with the difficult task of providing guidance for patients regarding optimal sequencing of therapeutics without sensitive clinical biomarkers to match a particular therapy’s putative mechanism of action to the patient’s specific pathophysiology. Moreover, while BG-12 has a preferred route of administration, there is limited safety data with which to guide counseling in the clinic. Dimethyl fumarate (DMF or BG-12) is one of three available oral therapies which will be discussed in this review in terms of its pharmacokinetic profile, putative mechanism of action, clinical effectiveness, safety, tolerance, and patient-reported experience. BG-12’s potential as a first-line therapy and as a sequencing therapeutic to aid in transition off natalizumab will be discussed.
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Affiliation(s)
- A Scott Nielsen
- Virginia Mason Multiple Sclerosis Center, Seattle, WA, USA.,Department of Neurology, University of Washington, Seattle, WA, USA
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