1
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Wilson EN, Do Carmo S, Welikovitch LA, Hall H, Aguilar LF, Foret MK, Iulita MF, Jia DT, Marks AR, Allard S, Emmerson JT, Ducatenzeiler A, Cuello AC. NP03, a Microdose Lithium Formulation, Blunts Early Amyloid Post-Plaque Neuropathology in McGill-R-Thy1-APP Alzheimer-Like Transgenic Rats. J Alzheimers Dis 2020; 73:723-739. [PMID: 31868669 DOI: 10.3233/jad-190862] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Epidemiological, preclinical, and clinical studies have suggested a role for microdose lithium in reducing Alzheimer's disease (AD) risk by modulating key mechanisms associated with AD pathology. The novel microdose lithium formulation, NP03, has disease-modifying effects in the McGill-R-Thy1-APP transgenic rat model of AD-like amyloidosis at pre-plaque stages, before frank amyloid-β (Aβ) plaque deposition, during which Aβ is primarily intraneuronal. Here, we are interested in determining whether the positive effects of microdose lithium extend into early Aβ post-plaque stages. We administered NP03 (40μg Li/kg; 1 ml/kg body weight) to McGill-R-Thy1-APP transgenic rats for 12 weeks spanning the transition phase from plaque-free to plaque-bearing. The effect of NP03 on remote working memory was assessed using the novel object recognition task. Levels of human Aβ38, Aβ40, and Aβ42 as well as levels of pro-inflammatory mediators were measured in brain-extracts and plasma using electrochemiluminescent assays. Mature Aβ plaques were visualized with a thioflavin-S staining. Vesicular acetylcholine transporter (VAChT) bouton density and levels of chemokine (C-X-C motif) ligand 1 (CXCL1), interleukin-6 (IL-6), and 4-hydroxynonenal (4-HNE) were probed using quantitative immunohistochemistry. During the early Aβ post-plaque stage, we find that NP03 rescues functional deficits in object recognition, reduces loss of cholinergic boutons in the hippocampus, reduces levels of soluble and insoluble cortical Aβ42 and reduces hippocampal Aβ plaque number. In addition, NP03 reduces markers of neuroinflammation and cellular oxidative stress. Together these results indicate that microdose lithium NP03 is effective at later stages of amyloid pathology, after appearance of Aβ plaques.
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Affiliation(s)
- Edward N Wilson
- Neurology and Neurosurgery, McGill University, Montreal Neurological Institute, Montreal, QC, Canada
| | - Sonia Do Carmo
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | | | - Hélène Hall
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | | | - Morgan K Foret
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | | | - Dan Tong Jia
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - Adam R Marks
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - Simon Allard
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | - Joshua T Emmerson
- Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada
| | | | - A Claudio Cuello
- Neurology and Neurosurgery, McGill University, Montreal Neurological Institute, Montreal, QC, Canada.,Pharmacology and Therapeutics, McGill University, Montreal, QC, Canada.,Anatomy and Cell Biology, McGill University, Montreal, QC, Canada.,Department of Pharmacology, University of Oxford, Oxford, United Kingdom (Visiting Professorship)
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2
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Bjorkli C, Sandvig A, Sandvig I. Bridging the Gap Between Fluid Biomarkers for Alzheimer's Disease, Model Systems, and Patients. Front Aging Neurosci 2020; 12:272. [PMID: 32982716 PMCID: PMC7492751 DOI: 10.3389/fnagi.2020.00272] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Accepted: 08/06/2020] [Indexed: 12/12/2022] Open
Abstract
Alzheimer’s disease (AD) is a debilitating neurodegenerative disease characterized by the accumulation of two proteins in fibrillar form: amyloid-β (Aβ) and tau. Despite decades of intensive research, we cannot yet pinpoint the exact cause of the disease or unequivocally determine the exact mechanism(s) underlying its progression. This confounds early diagnosis and treatment of the disease. Cerebrospinal fluid (CSF) biomarkers, which can reveal ongoing biochemical changes in the brain, can help monitor developing AD pathology prior to clinical diagnosis. Here we review preclinical and clinical investigations of commonly used biomarkers in animals and patients with AD, which can bridge translation from model systems into the clinic. The core AD biomarkers have been found to translate well across species, whereas biomarkers of neuroinflammation translate to a lesser extent. Nevertheless, there is no absolute equivalence between biomarkers in human AD patients and those examined in preclinical models in terms of revealing key pathological hallmarks of the disease. In this review, we provide an overview of current but also novel AD biomarkers and how they relate to key constituents of the pathological cascade, highlighting confounding factors and pitfalls in interpretation, and also provide recommendations for standardized procedures during sample collection to enhance the translational validity of preclinical AD models.
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Affiliation(s)
- Christiana Bjorkli
- Sandvig Group, Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
| | - Axel Sandvig
- Sandvig Group, Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway.,Institute of Neuromedicine and Movement Science, Department of Neurology, St. Olavs Hospital, Trondheim, Norway.,Department of Pharmacology and Clinical Neurosciences, Division of Neuro, Head, and Neck, University Hospital of Umeå, Umeå, Sweden
| | - Ioanna Sandvig
- Sandvig Group, Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
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3
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Zeiss CJ. Utility of spontaneous animal models of Alzheimer’s disease in preclinical efficacy studies. Cell Tissue Res 2020; 380:273-286. [DOI: 10.1007/s00441-020-03198-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2019] [Accepted: 03/03/2020] [Indexed: 12/14/2022]
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4
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Mei H, Han J, Klika KD, Izawa K, Sato T, Meanwell NA, Soloshonok VA. Applications of fluorine-containing amino acids for drug design. Eur J Med Chem 2019; 186:111826. [PMID: 31740056 DOI: 10.1016/j.ejmech.2019.111826] [Citation(s) in RCA: 130] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Revised: 10/21/2019] [Accepted: 10/26/2019] [Indexed: 01/26/2023]
Abstract
Fluorine-containing amino acids are becoming increasingly prominent in new drugs due to two general trends in the modern pharmaceutical industry. Firstly, the growing acceptance of peptides and modified peptides as drugs; and secondly, fluorine editing has become a prevalent protocol in drug-candidate optimization. Accordingly, fluorine-containing amino acids represent one of the more promising and rapidly developing areas of research in organic, bio-organic and medicinal chemistry. The goal of this Review article is to highlight the current state-of-the-art in this area by profiling 42 selected compounds that combine fluorine and amino acid structural elements. The compounds under discussion represent pharmaceutical drugs currently on the market, or in clinical trials as well as examples of drug-candidates that although withdrawn from development had a significant impact on the progress of medicinal chemistry and/or provided a deeper understanding of the nature and mechanism of biological action. For each compound, we present features of biological activity, a brief history of the design principles and the development of the synthetic approach, focusing on the source of tailor-made amino acid structures and fluorination methods. General aspects of the medicinal chemistry of fluorine-containing amino acids and synthetic methodology are briefly discussed.
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Affiliation(s)
- Haibo Mei
- College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China
| | - Jianlin Han
- College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China
| | - Karel D Klika
- Molecular Structure Analysis, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany
| | - Kunisuke Izawa
- Hamari Chemicals Ltd., 1-4-29 Kunijima, Higashi-Yodogawa-ku, Osaka, 533-0024, Japan.
| | - Tatsunori Sato
- Hamari Chemicals Ltd., 1-4-29 Kunijima, Higashi-Yodogawa-ku, Osaka, 533-0024, Japan
| | - Nicholas A Meanwell
- Department of Discovery Chemistry, Bristol-Myers Squibb Research and Development, PO Box 4000, Princeton, NJ, 08543-4000, United States.
| | - Vadim A Soloshonok
- Department of Organic Chemistry I, University of the Basque Country UPV/EHU, Paseo Manuel Lardizábal 3, 20018, San Sebastián, Spain; IKERBASQUE, Basque Foundation for Science, María Díaz de Haro 3, Plaza Bizkaia, 48013, Bilbao, Spain.
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5
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Schaduangrat N, Prachayasittikul V, Choomwattana S, Wongchitrat P, Phopin K, Suwanjang W, Malik AA, Vincent B, Nantasenamat C. Multidisciplinary approaches for targeting the secretase protein family as a therapeutic route for Alzheimer's disease. Med Res Rev 2019; 39:1730-1778. [PMID: 30628099 DOI: 10.1002/med.21563] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Revised: 11/21/2018] [Accepted: 12/24/2018] [Indexed: 12/27/2022]
Abstract
The continual increase of the aging population worldwide renders Alzheimer's disease (AD) a global prime concern. Several attempts have been focused on understanding the intricate complexity of the disease's development along with the on- andgoing search for novel therapeutic strategies. Incapability of existing AD drugs to effectively modulate the pathogenesis or to delay the progression of the disease leads to a shift in the paradigm of AD drug discovery. Efforts aimed at identifying AD drugs have mostly focused on the development of disease-modifying agents in which effects are believed to be long lasting. Of particular note, the secretase enzymes, a group of proteases responsible for the metabolism of the β-amyloid precursor protein (βAPP) and β-amyloid (Aβ) peptides production, have been underlined for their promising therapeutic potential. This review article attempts to comprehensively cover aspects related to the identification and use of drugs targeting the secretase enzymes. Particularly, the roles of secretases in the pathogenesis of AD and their therapeutic modulation are provided herein. Moreover, an overview of the drug development process and the contribution of computational (in silico) approaches for facilitating successful drug discovery are also highlighted along with examples of relevant computational works. Promising chemical scaffolds, inhibitors, and modulators against each class of secretases are also summarized herein. Additionally, multitarget secretase modulators are also taken into consideration in light of the current growing interest in the polypharmacology of complex diseases. Finally, challenging issues and future outlook relevant to the discovery of drugs targeting secretases are also discussed.
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Affiliation(s)
- Nalini Schaduangrat
- Faculty of Medical Technology, Center of Data Mining and Biomedical Informatics, Mahidol University, Bangkok, Thailand
| | - Veda Prachayasittikul
- Faculty of Medical Technology, Center of Data Mining and Biomedical Informatics, Mahidol University, Bangkok, Thailand
| | - Saowapak Choomwattana
- Faculty of Medical Technology, Center of Data Mining and Biomedical Informatics, Mahidol University, Bangkok, Thailand
| | - Prapimpun Wongchitrat
- Faculty of Medical Technology, Center for Research and Innovation, Mahidol University, Bangkok, Thailand
| | - Kamonrat Phopin
- Faculty of Medical Technology, Center for Research and Innovation, Mahidol University, Bangkok, Thailand
| | - Wilasinee Suwanjang
- Faculty of Medical Technology, Center for Research and Innovation, Mahidol University, Bangkok, Thailand
| | - Aijaz Ahmad Malik
- Faculty of Medical Technology, Center of Data Mining and Biomedical Informatics, Mahidol University, Bangkok, Thailand
| | - Bruno Vincent
- Institute of Molecular Biosciences, Mahidol University, Nakhon Pathom, Thailand.,Centre National de la Recherche Scientifique, Paris, France
| | - Chanin Nantasenamat
- Faculty of Medical Technology, Center of Data Mining and Biomedical Informatics, Mahidol University, Bangkok, Thailand
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6
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van Maanen EMT, van Steeg TJ, Ahsman MJ, Michener MS, Savage MJ, Kennedy ME, Kleijn HJ, Stone J, Danhof M. Extending a Systems Model of the APP Pathway: Separation of β- and γ-Secretase Sequential Cleavage Steps of APP. J Pharmacol Exp Ther 2018; 365:507-518. [PMID: 29563326 DOI: 10.1124/jpet.117.244699] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2017] [Accepted: 02/05/2018] [Indexed: 11/22/2022] Open
Abstract
The abnormal accumulation of amyloid-β (Aβ) in the brain parenchyma has been posited as a central event in the pathophysiology of Alzheimer's disease. Recently, we have proposed a systems pharmacology model of the amyloid precursor protein (APP) pathway, describing the Aβ APP metabolite responses (Aβ40, Aβ42, sAPPα, and sAPPβ) to β-secretase 1 (BACE1) inhibition. In this investigation this model was challenged to describe Aβ dynamics following γ-secretase (GS) inhibition. This led an extended systems pharmacology model, with separate descriptions to characterize the sequential cleavage steps of APP by BACE1 and GS, to describe the differences in Aβ response to their respective inhibition. Following GS inhibition, a lower Aβ40 formation rate constant was observed, compared with BACE1 inhibition. Both BACE1 and GS inhibition were predicted to lower Aβ oligomer levels. Further model refinement and new data may be helpful to fully understand the difference in Aβ dynamics following BACE1 versus GS inhibition.
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Affiliation(s)
- Eline M T van Maanen
- Division of Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands (E.M.T.v.M., M.D.); Leiden Experts on Advanced Pharmacokinetics and Pharmacodynamics, Leiden, The Netherlands (E.M.T.v.M., T.J.v.S., M.J.A.); and Merck & Company, Inc., Kenilworth, New Jersey (M.S.M., M.J.S., M.E.K., H.J.K., J.S.)
| | - Tamara J van Steeg
- Division of Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands (E.M.T.v.M., M.D.); Leiden Experts on Advanced Pharmacokinetics and Pharmacodynamics, Leiden, The Netherlands (E.M.T.v.M., T.J.v.S., M.J.A.); and Merck & Company, Inc., Kenilworth, New Jersey (M.S.M., M.J.S., M.E.K., H.J.K., J.S.)
| | - Maurice J Ahsman
- Division of Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands (E.M.T.v.M., M.D.); Leiden Experts on Advanced Pharmacokinetics and Pharmacodynamics, Leiden, The Netherlands (E.M.T.v.M., T.J.v.S., M.J.A.); and Merck & Company, Inc., Kenilworth, New Jersey (M.S.M., M.J.S., M.E.K., H.J.K., J.S.)
| | - Maria S Michener
- Division of Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands (E.M.T.v.M., M.D.); Leiden Experts on Advanced Pharmacokinetics and Pharmacodynamics, Leiden, The Netherlands (E.M.T.v.M., T.J.v.S., M.J.A.); and Merck & Company, Inc., Kenilworth, New Jersey (M.S.M., M.J.S., M.E.K., H.J.K., J.S.)
| | - Mary J Savage
- Division of Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands (E.M.T.v.M., M.D.); Leiden Experts on Advanced Pharmacokinetics and Pharmacodynamics, Leiden, The Netherlands (E.M.T.v.M., T.J.v.S., M.J.A.); and Merck & Company, Inc., Kenilworth, New Jersey (M.S.M., M.J.S., M.E.K., H.J.K., J.S.)
| | - Matthew E Kennedy
- Division of Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands (E.M.T.v.M., M.D.); Leiden Experts on Advanced Pharmacokinetics and Pharmacodynamics, Leiden, The Netherlands (E.M.T.v.M., T.J.v.S., M.J.A.); and Merck & Company, Inc., Kenilworth, New Jersey (M.S.M., M.J.S., M.E.K., H.J.K., J.S.)
| | - Huub Jan Kleijn
- Division of Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands (E.M.T.v.M., M.D.); Leiden Experts on Advanced Pharmacokinetics and Pharmacodynamics, Leiden, The Netherlands (E.M.T.v.M., T.J.v.S., M.J.A.); and Merck & Company, Inc., Kenilworth, New Jersey (M.S.M., M.J.S., M.E.K., H.J.K., J.S.)
| | - Julie Stone
- Division of Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands (E.M.T.v.M., M.D.); Leiden Experts on Advanced Pharmacokinetics and Pharmacodynamics, Leiden, The Netherlands (E.M.T.v.M., T.J.v.S., M.J.A.); and Merck & Company, Inc., Kenilworth, New Jersey (M.S.M., M.J.S., M.E.K., H.J.K., J.S.)
| | - Meindert Danhof
- Division of Pharmacology, Leiden Academic Center for Drug Research, Leiden University, Leiden, The Netherlands (E.M.T.v.M., M.D.); Leiden Experts on Advanced Pharmacokinetics and Pharmacodynamics, Leiden, The Netherlands (E.M.T.v.M., T.J.v.S., M.J.A.); and Merck & Company, Inc., Kenilworth, New Jersey (M.S.M., M.J.S., M.E.K., H.J.K., J.S.)
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7
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Van Dam D, De Deyn PP. Non human primate models for Alzheimer’s disease-related research and drug discovery. Expert Opin Drug Discov 2016; 12:187-200. [DOI: 10.1080/17460441.2017.1271320] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Debby Van Dam
- Laboratory of Neurochemistry and Behavior, Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
- Department of Neurology and Alzheimer Research Center, University of Groningen, University Medical Center Groningen (UMCG), Groningen, The Netherlands
| | - Peter Paul De Deyn
- Laboratory of Neurochemistry and Behavior, Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
- Department of Neurology and Alzheimer Research Center, University of Groningen, University Medical Center Groningen (UMCG), Groningen, The Netherlands
- Department of Neurology and Memory Clinic, Hospital Network Antwerp (ZNA) Middelheim and Hoge Beuken, Antwerp, Belgium
- Biobank, Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
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8
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Eketjäll S, Janson J, Kaspersson K, Bogstedt A, Jeppsson F, Fälting J, Haeberlein SB, Kugler AR, Alexander RC, Cebers G. AZD3293: A Novel, Orally Active BACE1 Inhibitor with High Potency and Permeability and Markedly Slow Off-Rate Kinetics. J Alzheimers Dis 2016; 50:1109-23. [PMID: 26890753 PMCID: PMC4927864 DOI: 10.3233/jad-150834] [Citation(s) in RCA: 83] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A growing body of pathological, biomarker, genetic, and mechanistic data suggests that amyloid accumulation, as a result of changes in production, processing, and/or clearance of brain amyloid-β peptide (Aβ) concentrations, plays a key role in the pathogenesis of Alzheimer’s disease (AD). Beta-secretase 1 (BACE1) mediates the first step in the processing of amyloid-β protein precursor (AβPP) to Aβ peptides, with the soluble N terminal fragment of AβPP (sAβPPβ) as a direct product, and BACE1 inhibition is an attractive target for therapeutic intervention to reduce the production of Aβ. Here, we report the in vitro and in vivo pharmacological profile of AZD3293, a potent, highly permeable, orally active, blood-brain barrier (BBB) penetrating, BACE1 inhibitor with unique slow off-rate kinetics. The in vitro potency of AZD3293 was demonstrated in several cellular models, including primary cortical neurons. In vivo in mice, guinea pigs, and dogs, AZD3293 displayed significant dose- and time-dependent reductions in plasma, cerebrospinal fluid, and brain concentrations of Aβ40, Aβ42, and sAβPPβ. The in vitro potency of AZD3293 in mouse and guinea pig primary cortical neuronal cells was correlated to the in vivo potency expressed as free AZD3293 concentrations in mouse and guinea pig brains. In mice and dogs, the slow off-rate from BACE1 may have translated into a prolongation of the observed effect beyond the turnover rate of Aβ. The preclinical data strongly support the clinical development of AZD3293, and patients with AD are currently being recruited into a combined Phase 2/3 study to test the disease-modifying properties of AZD3293.
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Affiliation(s)
- Susanna Eketjäll
- AstraZeneca Translational Sciences Centre, Science for Life Laboratory, Personal Healthcare and Biomarkers, AstraZeneca, Solna, Sweden.,Department of Clinical Neuroscience, Karolinska Institutet, Solna, Sweden
| | - Juliette Janson
- AstraZeneca Translational Sciences Centre, Science for Life Laboratory, Personal Healthcare and Biomarkers, AstraZeneca, Solna, Sweden.,Department of Clinical Neuroscience, Karolinska Institutet, Solna, Sweden
| | | | - Anna Bogstedt
- AstraZeneca Translational Sciences Centre, Science for Life Laboratory, Personal Healthcare and Biomarkers, AstraZeneca, Solna, Sweden.,Department of Clinical Neuroscience, Karolinska Institutet, Solna, Sweden
| | - Fredrik Jeppsson
- CNS and Pain iMed, AstraZeneca, Södertälje, Sweden.,Operations Global Quality, AstraZeneca, Södertälje, Sweden
| | | | | | - Alan R Kugler
- Neuroscience iMed, IMED Biotech Unit, AstraZeneca, Cambridge, MA, USA
| | | | - Gvido Cebers
- Neuroscience iMed, IMED Biotech Unit, AstraZeneca, Cambridge, MA, USA
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9
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van Maanen EMT, van Steeg TJ, Michener MS, Savage MJ, Kennedy ME, Kleijn HJ, Stone JA, Danhof M. Systems Pharmacology Analysis of the Amyloid Cascade after -Secretase Inhibition Enables the Identification of an A 42 Oligomer Pool. ACTA ACUST UNITED AC 2016; 357:205-16. [DOI: 10.1124/jpet.115.230565] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 01/27/2016] [Indexed: 12/16/2022]
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10
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Wyss DF, Cumming JN, Strickland CO, Stamford AW. BACE Inhibitors. FRAGMENT-BASED DRUG DISCOVERY LESSONS AND OUTLOOK 2016. [DOI: 10.1002/9783527683604.ch14] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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11
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Ghosh AK, Cárdenas EL, Osswald HL. The Design, Development, and Evaluation of BACE1 Inhibitors for the Treatment of Alzheimer’s Disease. TOPICS IN MEDICINAL CHEMISTRY 2016. [DOI: 10.1007/7355_2016_16] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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12
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Ambure P, Roy K. Understanding the structural requirements of cyclic sulfone hydroxyethylamines as hBACE1 inhibitors against Aβ plaques in Alzheimer's disease: a predictive QSAR approach. RSC Adv 2016. [DOI: 10.1039/c6ra04104c] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Beta (β)-site amyloid precursor protein cleaving enzyme 1 (BACE1) is one of the most important targets in Alzheimer's disease (AD), which is responsible for production and accumulation of beta amyloid (Aβ).
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Affiliation(s)
- Pravin Ambure
- Drug Theoretics and Cheminformatics Laboratory
- Department of Pharmaceutical Technology
- Jadavpur University
- Kolkata 700032
- India
| | - Kunal Roy
- Drug Theoretics and Cheminformatics Laboratory
- Department of Pharmaceutical Technology
- Jadavpur University
- Kolkata 700032
- India
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13
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Inhibition of BACE1 Activity by a DNA Aptamer in an Alzheimer's Disease Cell Model. PLoS One 2015; 10:e0140733. [PMID: 26473367 PMCID: PMC4608735 DOI: 10.1371/journal.pone.0140733] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Accepted: 09/28/2015] [Indexed: 02/07/2023] Open
Abstract
An initial step in amyloid-β (Aβ) production includes amyloid precursor protein (APP) cleavage via β-Site amyloid precursor protein cleaving enzyme 1 (BACE1). Increased levels of brain Aβ have been implicated in the pathogenesis of Alzheimer’s disease (AD). Thus, β-secretase represents a primary target for inhibitor drug development in AD. In this study, aptamers were obtained from combinatorial oligonucleotide libraries using a technology referred to as systematic evolution of ligands by exponential enrichment (SELEX). A purified human BACE1 extracellular domain was used as a target to conduct an in vitro selection process using SELEX. Two DNA aptamers were capable of binding to BACE1 with high affinity and good specificity, with Kd values in the nanomolar range. We subsequently confirmed that one aptamer, A1, exhibited a distinct inhibitory effect on BACE1 activity in an AD cell model. We detected the effects of M17-APPsw cells that stably expressed Swedish mutant APP after aptamer A1 treatment. Aβ40 and Aβ42 concentrations secreted by M17-APPsw cells decreased intracellularly and in culture media. Furthermore, Western blot analysis indicated that sAPPβ expression significantly decreased in the A1 treated versus control groups. These findings support the preliminary feasibility of an aptamer evolved from a SELEX strategy to function as a potential BACE1 inhibitor. To our knowledge, this is the first study to acquire a DNA aptamer that exhibited binding specificity to BACE1 and inhibited its activity.
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14
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Dorresteijn B, Rotman M, Faber D, Schravesande R, Suidgeest E, van der Weerd L, van der Maarel SM, Verrips CT, El Khattabi M. Camelid heavy chain only antibody fragment domain against β-site of amyloid precursor protein cleaving enzyme 1 inhibits β-secretase activityin vitroandin vivo. FEBS J 2015; 282:3618-31. [DOI: 10.1111/febs.13367] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 06/24/2015] [Accepted: 07/01/2015] [Indexed: 02/05/2023]
Affiliation(s)
- Bram Dorresteijn
- Biomolecular Imaging Group; Division of Cell Biology; Department of Biology; Faculty of Science; Utrecht University; The Netherlands
| | - Maarten Rotman
- Department of Radiology; Leiden University Medical Center; Leiden The Netherlands
- Department of Human Genetics; Leiden University Medical Center; Leiden The Netherlands
| | - Dorien Faber
- Biomolecular Imaging Group; Division of Cell Biology; Department of Biology; Faculty of Science; Utrecht University; The Netherlands
| | - Ruud Schravesande
- Biomolecular Imaging Group; Division of Cell Biology; Department of Biology; Faculty of Science; Utrecht University; The Netherlands
| | - Ernst Suidgeest
- Department of Radiology; Leiden University Medical Center; Leiden The Netherlands
| | - Louise van der Weerd
- Department of Radiology; Leiden University Medical Center; Leiden The Netherlands
- Department of Human Genetics; Leiden University Medical Center; Leiden The Netherlands
| | | | - Cornelis T. Verrips
- Biomolecular Imaging Group; Division of Cell Biology; Department of Biology; Faculty of Science; Utrecht University; The Netherlands
- QVQ Holding BV; Utrecht The Netherlands
| | - Mohamed El Khattabi
- Biomolecular Imaging Group; Division of Cell Biology; Department of Biology; Faculty of Science; Utrecht University; The Netherlands
- QVQ Holding BV; Utrecht The Netherlands
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15
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Dislich B, Wohlrab F, Bachhuber T, Müller SA, Kuhn PH, Hogl S, Meyer-Luehmann M, Lichtenthaler SF. Label-free Quantitative Proteomics of Mouse Cerebrospinal Fluid Detects β-Site APP Cleaving Enzyme (BACE1) Protease Substrates In Vivo. Mol Cell Proteomics 2015; 14:2550-63. [PMID: 26139848 DOI: 10.1074/mcp.m114.041533] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Indexed: 12/19/2022] Open
Abstract
Analysis of murine cerebrospinal fluid (CSF) by quantitative mass spectrometry is challenging because of low CSF volume, low total protein concentration, and the presence of highly abundant proteins such as albumin. We demonstrate that the CSF proteome of individual mice can be analyzed in a quantitative manner to a depth of several hundred proteins in a robust and simple workflow consisting of single ultra HPLC runs on a benchtop mass spectrometer. The workflow is validated by a comparative analysis of BACE1-/- and wild-type mice using label-free quantification. The protease BACE1 cleaves the amyloid precursor protein (APP) as well as several other substrates and is a major drug target in Alzheimer's disease. We identified a total of 715 proteins with at least 2 unique peptides and quantified 522 of those proteins in CSF from BACE1-/- and wild-type mice. Several proteins, including the known BACE1 substrates APP, APLP1, CHL1 and contactin-2 showed lower abundance in the CSF of BACE1-/- mice, demonstrating that BACE1 substrate identification is possible from CSF. Additionally, ectonucleotide pyrophosphatase 5 was identified as a novel BACE1 substrate and validated in cells using immunoblots and by an in vitro BACE1 protease assay. Likewise, receptor-type tyrosine-protein phosphatase N2 and plexin domain-containing 2 were confirmed as BACE1 substrates by in vitro assays. Taken together, our study shows the deepest characterization of the mouse CSF proteome to date and the first quantitative analysis of the CSF proteome of individual mice. The BACE1 substrates identified in CSF may serve as biomarkers to monitor BACE1 activity in Alzheimer patients treated with BACE inhibitors.
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Affiliation(s)
- Bastian Dislich
- From the ‡German Center for Neurodegenerative Diseases (DZNE), Munich, Germany; §Neuroproteomics, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Felix Wohlrab
- From the ‡German Center for Neurodegenerative Diseases (DZNE), Munich, Germany; §Neuroproteomics, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Teresa Bachhuber
- ¶Adolf Butenandt Institute, Ludwig-Maximilians University, Munich Biochemistry, Munich Germany
| | - Stephan A Müller
- From the ‡German Center for Neurodegenerative Diseases (DZNE), Munich, Germany; §Neuroproteomics, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Peer-Hendrik Kuhn
- §Neuroproteomics, Klinikum rechts der Isar, Technische Universität München, Munich, Germany; **Institute for Advanced Study, Technische Universität München, Garching, Germany
| | - Sebastian Hogl
- From the ‡German Center for Neurodegenerative Diseases (DZNE), Munich, Germany; §Neuroproteomics, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | | | - Stefan F Lichtenthaler
- From the ‡German Center for Neurodegenerative Diseases (DZNE), Munich, Germany; §Neuroproteomics, Klinikum rechts der Isar, Technische Universität München, Munich, Germany; **Institute for Advanced Study, Technische Universität München, Garching, Germany; ‡‡Munich Center for Systems Neurology (SyNergy), Munich, Germany
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Ghosh AK, Osswald HL. BACE1 (β-secretase) inhibitors for the treatment of Alzheimer's disease. Chem Soc Rev 2015; 43:6765-813. [PMID: 24691405 DOI: 10.1039/c3cs60460h] [Citation(s) in RCA: 233] [Impact Index Per Article: 25.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
BACE1 (β-secretase, memapsin 2, Asp2) has emerged as a promising target for the treatment of Alzheimer's disease. BACE1 is an aspartic protease which functions in the first step of the pathway leading to the production and deposition of amyloid-β peptide (Aβ). Its gene deletion showed only mild phenotypes. BACE1 inhibition has direct implications in the Alzheimer's disease pathology without largely affecting viability. However, inhibiting BACE1 selectively in vivo has presented many challenges to medicinal chemists. Since its identification in 2000, inhibitors covering many different structural classes have been designed and developed. These inhibitors can be largely classified as either peptidomimetic or non-peptidic inhibitors. Progress in these fields resulted in inhibitors that contain many targeted drug-like characteristics. In this review, we describe structure-based design strategies and evolution of a wide range of BACE1 inhibitors including compounds that have been shown to reduce brain Aβ, rescue the cognitive decline in transgenic AD mice and inhibitor drug candidates that are currently in clinical trials.
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Affiliation(s)
- Arun K Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA
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Abstract
BACE, a β-secretase, is an attractive potential disease-modifying therapeutic strategy for Alzheimer's disease (AD) as it results directly in the decrease of amyloid precursor protein (APP) processing through the β-secretase pathway and a lowering of CNS amyloid-β (Aβ) levels. The interaction of the β-secretase and α-secretase pathway-mediated processing of APP in the rhesus monkey (nonhuman primate; NHP) CNS is not understood. We hypothesized that CNS inhibition of BACE would result in decreased newly generated Aβ and soluble APPβ (sAPPβ), with increased newly generated sAPPα. A stable isotope labeling kinetics experiment in NHPs was performed with a (13)C6-leucine infusion protocol to evaluate effects of BACE inhibition on CNS APP processing by measuring the kinetics of sAPPα, sAPPβ, and Aβ in CSF. Each NHP received a low, medium, or high dose of MBI-5 (BACE inhibitor) or vehicle in a four-way crossover design. CSF sAPPα, sAPPβ, and Aβ were measured by ELISA and newly incorporated label following immunoprecipitation and liquid chromatography-mass spectrometry. Concentrations, kinetics, and amount of newly generated APP fragments were calculated. sAPPβ and sAPPα kinetics were similar, but both significantly slower than Aβ. BACE inhibition resulted in decreased labeled sAPPβ and Aβ in CSF, without observable changes in labeled CSF sAPPα. ELISA concentrations of sAPPβ and Aβ both decreased and sAPPα increased. sAPPα increased by ELISA, with no difference by labeled sAPPα kinetics indicating increases in product may be due to APP shunting from the β-secretase to the α-secretase pathway. These results provide a quantitative understanding of pharmacodynamic effects of BACE inhibition on NHP CNS, which can inform about target development.
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Vassar R, Kuhn PH, Haass C, Kennedy ME, Rajendran L, Wong PC, Lichtenthaler SF. Function, therapeutic potential and cell biology of BACE proteases: current status and future prospects. J Neurochem 2014; 130:4-28. [PMID: 24646365 PMCID: PMC4086641 DOI: 10.1111/jnc.12715] [Citation(s) in RCA: 235] [Impact Index Per Article: 23.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2014] [Revised: 03/12/2014] [Accepted: 03/14/2014] [Indexed: 01/18/2023]
Abstract
The β-site APP cleaving enzymes 1 and 2 (BACE1 and BACE2) were initially identified as transmembrane aspartyl proteases cleaving the amyloid precursor protein (APP). BACE1 is a major drug target for Alzheimer's disease because BACE1-mediated cleavage of APP is the first step in the generation of the pathogenic amyloid-β peptides. BACE1, which is highly expressed in the nervous system, is also required for myelination by cleaving neuregulin 1. Several recent proteomic and in vivo studies using BACE1- and BACE2-deficient mice demonstrate a much wider range of physiological substrates and functions for both proteases within and outside of the nervous system. For BACE1 this includes axon guidance, neurogenesis, muscle spindle formation, and neuronal network functions, whereas BACE2 was shown to be involved in pigmentation and pancreatic β-cell function. This review highlights the recent progress in understanding cell biology, substrates, and functions of BACE proteases and discusses the therapeutic options and potential mechanism-based liabilities, in particular for BACE inhibitors in Alzheimer's disease. The protease BACE1 is a major drug target in Alzheimer disease. Together with its homolog BACE2, both proteases have an increasing number of functions within and outside of the nervous system. This review highlights recent progress in understanding cell biology, substrates, and functions of BACE proteases and discusses the therapeutic options and potential mechanism-based liabilities, in particular for BACE inhibitors in Alzheimer disease.
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Affiliation(s)
- Robert Vassar
- Department of Cell and Molecular Biology, Feinberg University School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Peer-Hendrik Kuhn
- German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
- Neuroproteomics, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
- Institute for Advanced Study, Technische Universität München, Garching, Germany
| | - Christian Haass
- German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
- Munich Cluster of Systems Neurology (SyNergy), Munich, Germany
- Adolf-Butenandt Institute, Biochemistry, Ludwig-Maximilians University Munich, Munich, Germany
| | - Matthew E. Kennedy
- Neurosciences, Merck Research Labs, Boston, Massachusetts, USA
- Division of Psychiatry Research, University of Zurich, Zurich, Switzerland
| | - Lawrence Rajendran
- Systems and Cell Biology of Neurodegeneration, Division of Psychiatry Research, University of Zurich, Zurich, Switzerland
- Graduate programs of the Zurich Center for Integrative Human Physiology and Zurich Neuroscience Center, University of Zurich, Zurich, Switzerland
| | - Philip C. Wong
- Departments of Pathology and Neuroscience, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA
| | - Stefan F. Lichtenthaler
- German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
- Neuroproteomics, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
- Institute for Advanced Study, Technische Universität München, Garching, Germany
- Munich Cluster of Systems Neurology (SyNergy), Munich, Germany
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Uchida Y, Wakayama K, Ohtsuki S, Chiba M, Ohe T, Ishii Y, Terasaki T. Blood-brain barrier pharmacoproteomics-based reconstruction of the in vivo brain distribution of P-glycoprotein substrates in cynomolgus monkeys. J Pharmacol Exp Ther 2014; 350:578-88. [PMID: 24947467 DOI: 10.1124/jpet.114.214536] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The aim of this study was to investigate whether in vivo drug distribution in brain in monkeys can be reconstructed by integrating four factors: protein expression levels of P-glycoprotein (P-gp)/multidrug resistance protein 1 at the blood-brain barrier (BBB), in vitro transport activity per P-gp molecule, and unbound drug fractions in plasma and brain. For five P-gp substrates (indinavir, quinidine, loperamide, paclitaxel, and verapamil) and one nonsubstrate (diazepam), in vitro P-gp transport activities were determined by measuring transcellular transport across monolayers of cynomolgus monkey P-gp-transfected LLC-PK1 and parental cells. In vivo P-gp functions at the BBB were reconstructed from in vitro P-gp transport activities and P-gp expression levels in transfected cells and cynomolgus brain microvessels. Brain-to-plasma concentration ratios (Kp,brain) were reconstructed by integrating the reconstructed in vivo P-gp functions with drug unbound fractions in plasma and brain. For all compounds, the reconstructed Kp,brain values were within a 3-fold range of observed values, as determined by constant intravenous infusion in adult cynomolgus monkeys. Among four factors, plasma unbound fraction was the most sensitive factor to species differences in Kp,brain between monkeys and mice. Unbound brain-to-plasma concentration ratios (Kp,uu,brain) were reconstructed as the reciprocal of the reconstructed in vivo P-gp functions, and the reconstructed Kp,uu,brain values were within a 3-fold range of in vivo values, which were estimated from observed Kp,brain and unbound fractions. This study experimentally demonstrates that brain distributions of P-gp substrates and nonsubstrate can be reconstructed on the basis of pharmacoproteomic concept in monkeys, which serve as a robust model of drug distribution in human brain.
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Affiliation(s)
- Yasuo Uchida
- Division of Membrane Transport and Drug Targeting, Graduate School of Pharmaceutical Sciences, Tohoku University, Miyagi, Japan (Y.U., T.T.); Department of Drug Metabolism, Tsukuba Research Institute, Banyu Pharmaceutical Co., Ltd., Ibaraki, Japan (K.W., M.C., T.O., Y.I.); and Department of Pharmaceutical Microbiology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan (S.O.)
| | - Kentaro Wakayama
- Division of Membrane Transport and Drug Targeting, Graduate School of Pharmaceutical Sciences, Tohoku University, Miyagi, Japan (Y.U., T.T.); Department of Drug Metabolism, Tsukuba Research Institute, Banyu Pharmaceutical Co., Ltd., Ibaraki, Japan (K.W., M.C., T.O., Y.I.); and Department of Pharmaceutical Microbiology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan (S.O.)
| | - Sumio Ohtsuki
- Division of Membrane Transport and Drug Targeting, Graduate School of Pharmaceutical Sciences, Tohoku University, Miyagi, Japan (Y.U., T.T.); Department of Drug Metabolism, Tsukuba Research Institute, Banyu Pharmaceutical Co., Ltd., Ibaraki, Japan (K.W., M.C., T.O., Y.I.); and Department of Pharmaceutical Microbiology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan (S.O.)
| | - Masato Chiba
- Division of Membrane Transport and Drug Targeting, Graduate School of Pharmaceutical Sciences, Tohoku University, Miyagi, Japan (Y.U., T.T.); Department of Drug Metabolism, Tsukuba Research Institute, Banyu Pharmaceutical Co., Ltd., Ibaraki, Japan (K.W., M.C., T.O., Y.I.); and Department of Pharmaceutical Microbiology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan (S.O.)
| | - Tomoyuki Ohe
- Division of Membrane Transport and Drug Targeting, Graduate School of Pharmaceutical Sciences, Tohoku University, Miyagi, Japan (Y.U., T.T.); Department of Drug Metabolism, Tsukuba Research Institute, Banyu Pharmaceutical Co., Ltd., Ibaraki, Japan (K.W., M.C., T.O., Y.I.); and Department of Pharmaceutical Microbiology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan (S.O.)
| | - Yasuyuki Ishii
- Division of Membrane Transport and Drug Targeting, Graduate School of Pharmaceutical Sciences, Tohoku University, Miyagi, Japan (Y.U., T.T.); Department of Drug Metabolism, Tsukuba Research Institute, Banyu Pharmaceutical Co., Ltd., Ibaraki, Japan (K.W., M.C., T.O., Y.I.); and Department of Pharmaceutical Microbiology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan (S.O.)
| | - Tetsuya Terasaki
- Division of Membrane Transport and Drug Targeting, Graduate School of Pharmaceutical Sciences, Tohoku University, Miyagi, Japan (Y.U., T.T.); Department of Drug Metabolism, Tsukuba Research Institute, Banyu Pharmaceutical Co., Ltd., Ibaraki, Japan (K.W., M.C., T.O., Y.I.); and Department of Pharmaceutical Microbiology, Faculty of Life Sciences, Kumamoto University, Kumamoto, Japan (S.O.)
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20
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Abstract
A hallmark of Alzheimer's disease (AD) brain is the amyloid β (Aβ) plaque, which is comprised of Aβ peptides. Multiple lines of evidence suggest that Aβ oligomers are more toxic than other peptide forms. We sought to develop a robust assay to quantify oligomers from CSF. Antibody 19.3 was compared in one-site and competitive ELISAs for oligomer binding specificity. A two-site ELISA for oligomers was developed using 19.3 coupled to a sensitive, bead-based fluorescent platform able to detect single photons of emitted light. The two-site ELISA was >2500× selective for Aβ oligomers over Aβ monomers with a limit of detection ∼ 0.09 pg/ml in human CSF. The lower limit of reliable quantification of the assay was 0.18 pg/ml and the antibody pairs recognized Aβ multimers comprised of either synthetic standards, or endogenous oligomers isolated from confirmed human AD and healthy control brain. Using the assay, a significant 3- to 5-fold increase in Aβ oligomers in human AD CSF compared with comparably aged controls was demonstrated. The increase was seen in three separate human cohorts, totaling 63 AD and 54 controls. CSF oligomers ranged between 0.1 and 10 pg/ml. Aβ oligomer levels did not strongly associate with age or gender, but had an inverse correlation with MMSE score. The C statistic for the Aβ oligomer ROC curve was 0.86, with 80% sensitivity and 88% specificity to detect AD, suggesting reasonable discriminatory power for the AD state and the potential for utility as a diagnostic marker.
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Evin G, Barakat A. Critical analysis of the use of β-site amyloid precursor protein-cleaving enzyme 1 inhibitors in the treatment of Alzheimer's disease. Degener Neurol Neuromuscul Dis 2014; 4:1-19. [PMID: 32669897 PMCID: PMC7337240 DOI: 10.2147/dnnd.s41056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Accepted: 03/06/2014] [Indexed: 01/18/2023] Open
Abstract
Alzheimer’s disease (AD) is the major cause of dementia in the elderly and an unmet clinical challenge. A variety of therapies that are currently under development are directed to the amyloid cascade. Indeed, the accumulation and toxicity of amyloid-β (Aβ) is believed to play a central role in the etiology of the disease, and thus rational interventions are aimed at reducing the levels of Aβ in the brain. Targeting β-site amyloid precursor protein-cleaving enzyme (BACE)-1 represents an attractive strategy, as this enzyme catalyzes the initial and rate-limiting step in Aβ production. Observation of increased levels of BACE1 and enzymatic activity in the brain, cerebrospinal fluid, and platelets of patients with AD and mild cognitive impairment supports the potential benefits of BACE1 inhibition. Numerous potent inhibitors have been generated, and many of these have been proved to lower Aβ levels in the brain of animal models. Over 10 years of intensive research on BACE1 inhibitors has now culminated in advancing half a dozen of these drugs into human trials, yet translating the in vitro and cellular efficacy of BACE1 inhibitors into preclinical and clinical trials represents a challenge. This review addresses the promises and also the potential problems associated with BACE1 inhibitors for AD therapy, as the complex biological function of BACE1 in the brain is becoming unraveled.
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Affiliation(s)
- Genevieve Evin
- Oxidation Biology Laboratory, Mental Health Research Institute, Florey Institute of Neuroscience and Mental Health, University of Melbourne.,Department of Pathology, University of Melbourne, Parkville, VIC, Australia
| | - Adel Barakat
- Department of Pathology, University of Melbourne, Parkville, VIC, Australia
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22
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Toledano A, Álvarez M, López-Rodríguez A, Toledano-Díaz A, Fernández-Verdecia C. Does Alzheimer disease exist in all primates? Alzheimer pathology in non-human primates and its pathophysiological implications (II). NEUROLOGÍA (ENGLISH EDITION) 2014. [DOI: 10.1016/j.nrleng.2011.05.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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23
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Butini S, Gabellieri E, Brindisi M, Giovani S, Maramai S, Kshirsagar G, Guarino E, Brogi S, La Pietra V, Giustiniano M, Marinelli L, Novellino E, Campiani G, Cappelli A, Gemma S. A stereoselective approach to peptidomimetic BACE1 inhibitors. Eur J Med Chem 2013; 70:233-47. [DOI: 10.1016/j.ejmech.2013.09.056] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 09/25/2013] [Accepted: 09/28/2013] [Indexed: 11/16/2022]
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Biomarker-Driven Therapeutic Management of Alzheimer’s Disease: Establishing the Foundations. Clin Pharmacol Ther 2013; 95:67-77. [DOI: 10.1038/clpt.2013.205] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 09/20/2013] [Indexed: 11/08/2022]
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25
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Janson J, Eketjäll S, Tunblad K, Jeppsson F, Von Berg S, Niva C, Radesäter AC, Fälting J, Visser SAG. Population PKPD modeling of BACE1 inhibitor-induced reduction in Aβ levels in vivo and correlation to in vitro potency in primary cortical neurons from mouse and guinea pig. Pharm Res 2013; 31:670-83. [PMID: 24092053 DOI: 10.1007/s11095-013-1189-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2013] [Accepted: 08/09/2013] [Indexed: 12/26/2022]
Abstract
PURPOSE The aims were to quantify the in vivo time-course between the oral dose, the plasma and brain exposure and the inhibitory effect on Amyloid β (Aβ) in brain and cerebrospinal fluid, and to establish the correlation between in vitro and in vivo potency of novel β-secretase (BACE1) inhibitors. METHODS BACE1-mediated inhibition of Aβ was quantified in in vivo dose- and/or time-response studies and in vitro in SH-SY5Y cells, N2A cells, and primary cortical neurons (PCN). An indirect response model with inhibition on Aβ production rate was used to estimate unbound in vivo IC 50 in a population pharmacokinetic-pharmacodynamic modeling approach. RESULTS Estimated in vivo inhibitory potencies varied between 1 and 1,000 nM. The turnover half-life of Aβ40 in brain was predicted to be 0.5 h in mouse and 1 h in guinea pig. An excellent correlation between PCN and in vivo potency was observed. Moreover, a strong correlation in potency was found between human SH-SY5Y cells and mouse PCN, being 4.5-fold larger in SH-SY5Y cells. CONCLUSION The strong in vivo-in vitro correlation increased the confidence in using human cell lines for screening and optimization of BACE1 inhibitors. This can optimize the design and reduce the number of preclinical in vivo effect studies.
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Affiliation(s)
- Juliette Janson
- Modeling & Simulation, DMPK, Innovative Medicines CNSP AstraZeneca, SE-15185, Södertälje, Sweden,
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AZ-4217: a high potency BACE inhibitor displaying acute central efficacy in different in vivo models and reduced amyloid deposition in Tg2576 mice. J Neurosci 2013; 33:10075-84. [PMID: 23761903 DOI: 10.1523/jneurosci.1165-13.2013] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Aβ, the product of APP (amyloid precursor protein), has been implicated in the pathophysiology of Alzheimer's disease (AD). β-Site APP cleaving enzyme1 (BACE1) is the enzyme initiating the processing of the APP to Aβ peptides. Small molecule BACE1 inhibitors are expected to decrease Aβ-peptide generation and thereby reduce amyloid plaque formation in the brain, a neuropathological hallmark of AD. BACE1 inhibition thus addresses a key mechanism in AD and its potential as a therapeutic target is currently being addressed in clinical studies. Here, we report the discovery and the pharmacokinetic and pharmacodynamic properties of BACE1 inhibitor AZ-4217, a high potency compound (IC50 160 pM in human SH-SY5Y cells) with an excellent in vivo efficacy. Central efficacy of BACE1 inhibition was observed after a single dose in C57BL/6 mice, guinea pigs, and in an APP transgenic mouse model of cerebral amyloidosis (Tg2576). Furthermore, we demonstrate that in a 1 month treatment paradigm BACE1 inhibition of Aβ production does lower amyloid deposition in 12-month-old Tg2576 mice. These results strongly support BACE1 inhibition as concretely impacting amyloid deposition and therefore potentially an important approach for therapeutic intervention in AD.
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27
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Devi L, Ohno M. Mechanisms that lessen benefits of β-secretase reduction in a mouse model of Alzheimer's disease. Transl Psychiatry 2013; 3:e284. [PMID: 23880880 PMCID: PMC3731791 DOI: 10.1038/tp.2013.59] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Revised: 05/22/2013] [Accepted: 05/25/2013] [Indexed: 01/18/2023] Open
Abstract
The β-secretase enzyme BACE1 (β-site amyloid precursor protein-cleaving enzyme 1), which initiates amyloid-β (Aβ) production, is an excellent therapeutic target for Alzheimer's disease (AD). However, recent evidence raises concern that BACE1-inhibiting approaches may encounter dramatic declines in their abilities to ameliorate AD-like pathology and memory deficits during disease progression. Here, we used BACE1 haploinsufficiency as a therapeutic relevant model to evaluate the efficacy of partial inhibition of this enzyme. Specifically, we crossed BACE1(+/-) mice with 5XFAD transgenic mice and investigated the mechanisms by which Aβ accumulation and related memory impairments become less sensitive to rescue by BACE1(+/-) reduction. Haploinsufficiency lowered BACE1 expression by ∼50% in 5XFAD mice regardless of age in concordance with reduction in gene copy number. However, profound Aβ plaque pathology and memory deficits concomitant with BACE1 equivalent to wild-type control levels remained in BACE1(+/-)·5XFAD mice with advanced age (15-18 months old). Therefore, BACE1 haploinsufficiency is not sufficient to block the elevation of BACE1 expression (approximately twofold), which is also reported to occur during human AD progression, in 5XFAD mice. Our investigation revealed that PERK (PKR-endoplasmic reticulum-related kinase)-dependent activation of eIF2α (eukaryotic translation initiation factor-2α) accounts for the persistent BACE1 upregulation in BACE1(+/-)·5XFAD mouse brains at 15-18 months of age. Moreover, BACE1 haploinsufficiency was also no longer able to prevent reduction in the expression of neprilysin, a crucial Aβ-degrading enzyme, in 5XFAD mice with advanced age. These findings demonstrate that partial BACE1 suppression cannot attenuate deleterious BACE1-elevating or neprilysin-reducing mechanisms, limiting its capabilities to reduce cerebral Aβ accumulation and rescue memory defects during the course of AD development.
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Affiliation(s)
- L Devi
- Center for Dementia Research, Nathan Kline Institute, Orangeburg, NY, USA
| | - M Ohno
- Center for Dementia Research, Nathan Kline Institute, Orangeburg, NY, USA
- Department of Psychiatry, New York University Langone Medical Center, New York, NY, USA
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28
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Videira R, Castanheira P, Grãos M, Salgueiro L, Faro C, Cavaleiro C. A necrodane monoterpenoid fromLavandula luisieriessential oil as a cell-permeable inhibitor of BACE-1, theβ-secretase in Alzheimer's disease. FLAVOUR FRAG J 2013. [DOI: 10.1002/ffj.3156] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
| | - Pedro Castanheira
- Biocant - Center of Innovation in Biotechnology; Parque Tecnológico de Cantanhede; Núcleo 04, Lote 2; 3060-197; Cantanhede; Portugal
| | - Mário Grãos
- Biocant - Center of Innovation in Biotechnology; Parque Tecnológico de Cantanhede; Núcleo 04, Lote 2; 3060-197; Cantanhede; Portugal
| | - Lígia Salgueiro
- Center of Pharmaceutical Studies, Faculty of Pharmacy; University of Coimbra, Pólo das Ciências da Saúde, Azinhaga de Santa Comba; 3000-548; Coimbra; Portugal
| | | | - Carlos Cavaleiro
- Center of Pharmaceutical Studies, Faculty of Pharmacy; University of Coimbra, Pólo das Ciências da Saúde, Azinhaga de Santa Comba; 3000-548; Coimbra; Portugal
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Alzheimer's disease biomarkers: correspondence between human studies and animal models. Neurobiol Dis 2013; 56:116-30. [PMID: 23631871 DOI: 10.1016/j.nbd.2013.04.010] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 04/11/2013] [Accepted: 04/18/2013] [Indexed: 01/05/2023] Open
Abstract
Alzheimer's disease (AD) represents an escalating global threat as life expectancy and disease prevalence continue to increase. There is a considerable need for earlier diagnoses to improve clinical outcomes. Fluid biomarkers measured from cerebrospinal fluid (CSF) and blood, or imaging biomarkers have considerable potential to assist in the diagnosis and management of AD. An additional important utility of biomarkers is in novel therapeutic development and clinical trials to assess efficacy and side effects of therapeutic interventions. Because many biomarkers are initially examined in animal models, the extent to which markers translate from animals to humans is an important issue. The current review highlights many existing and pipeline biomarker approaches, focusing on the degree of correspondence between AD patients and animal models. The review also highlights the need for greater translational correspondence between human and animal biomarkers.
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Hunt KW, Cook AW, Watts RJ, Clark CT, Vigers G, Smith D, Metcalf AT, Gunawardana IW, Burkard M, Cox AA, Geck Do MK, Dutcher D, Thomas AA, Rana S, Kallan NC, DeLisle RK, Rizzi JP, Regal K, Sammond D, Groneberg R, Siu M, Purkey H, Lyssikatos JP, Marlow A, Liu X, Tang TP. Spirocyclic β-site amyloid precursor protein cleaving enzyme 1 (BACE1) inhibitors: from hit to lowering of cerebrospinal fluid (CSF) amyloid β in a higher species. J Med Chem 2013; 56:3379-403. [PMID: 23537249 DOI: 10.1021/jm4002154] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A hallmark of Alzheimer's disease is the brain deposition of amyloid beta (Aβ), a peptide of 36-43 amino acids that is likely a primary driver of neurodegeneration. Aβ is produced by the sequential cleavage of APP by BACE1 and γ-secretase; therefore, inhibition of BACE1 represents an attractive therapeutic target to slow or prevent Alzheimer's disease. Herein we describe BACE1 inhibitors with limited molecular flexibility and molecular weight that decrease CSF Aβ in vivo, despite efflux. Starting with spirocycle 1a, we explore structure-activity relationships of core changes, P3 moieties, and Asp binding functional groups in order to optimize BACE1 affinity, cathepsin D selectivity, and blood-brain barrier (BBB) penetration. Using wild type guinea pig and rat, we demonstrate a PK/PD relationship between free drug concentrations in the brain and CSF Aβ lowering. Optimization of brain exposure led to the discovery of (R)-50 which reduced CSF Aβ in rodents and in monkey.
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Affiliation(s)
- Kevin W Hunt
- Array BioPharma, 3200 Walnut Street, Boulder, CO 80301, USA.
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31
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Liu X, Wong H, Scearce-Levie K, Watts RJ, Coraggio M, Shin YG, Peng K, Wildsmith KR, Atwal JK, Mango J, Schauer SP, Regal K, Hunt KW, Thomas AA, Siu M, Lyssikatos J, Deshmukh G, Hop CECA. Mechanistic pharmacokinetic-pharmacodynamic modeling of BACE1 inhibition in monkeys: development of a predictive model for amyloid precursor protein processing. Drug Metab Dispos 2013; 41:1319-28. [PMID: 23584887 DOI: 10.1124/dmd.112.050864] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
This study was conducted to determine the pharmacokinetics (PK) and pharmacodynamics (PD) of two novel inhibitors of β-site amyloid precursor protein (APP)-cleaving enzyme (BACE1), GNE-629 [(4S,4a'S,10a'S)-2-amino-8'-(2-fluoropyridin-3-yl)-1-methyl-3',4',4a',10a'-tetrahydro-1'H-spiro[imidazole-4,10'-pyrano[4,3-b]chromen]-5(1H)-one] and GNE-892 [(R)-2-amino-1,3',3'-trimethyl-7'-(pyrimidin-5-yl)-3',4'-dihydro-2'H-spiro[imidazole-4,1'-naphthalen]-5(1H)-one], and to develop a PK-PD model to predict in vivo effects based solely on in vitro activity and PK. GNE-629 and GNE-892 concentrations and PD biomarkers including amyloid β (Aβ) in the plasma and cerebrospinal fluid (CSF), and secreted APPβ (sAPPβ) and secreted APPα (sAPPα) in the CSF were measured after a single oral administration of GNE-629 (100 mg/kg) or GNE-892 (30 or 100 mg/kg) in cynomolgus monkeys. A mechanistic PK-PD model was developed to simultaneously characterize the plasma Aβ and CSF Aβ, sAPPα, and sAPPβ using GNE-629 in vivo data. This model was used to predict the in vivo effects of GNE-892 after adjustments based on differences in in vitro cellular activity and PK. The PK-PD model estimated GNE-629 CSF and free plasma IC₅₀ of 0.0033 μM and 0.065 μM, respectively. These differences in CSF and free plasma IC₅₀ suggest that different mechanisms are involved in Aβ formation in these two compartments. The predicted in vivo effects for GNE-892 using the PK-PD model were consistent with the observed data. In conclusion, a PK-PD model was developed to mechanistically describe the effects of BACE1 inhibition on Aβ, sAPPβ, and sAPPα in the CSF, and Aβ in the plasma. This model can be used to prospectively predict in vivo effects of new BACE1 inhibitors using just their in vitro activity and PK data.
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Affiliation(s)
- Xingrong Liu
- Genentech Inc., MS 41-2A, 1 DNA Way, South San Francisco, CA 94080, USA.
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Yuan J, Venkatraman S, Zheng Y, McKeever BM, Dillard LW, Singh SB. Structure-based design of β-site APP cleaving enzyme 1 (BACE1) inhibitors for the treatment of Alzheimer's disease. J Med Chem 2013; 56:4156-80. [PMID: 23509904 DOI: 10.1021/jm301659n] [Citation(s) in RCA: 113] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The amyloid hypothesis asserts that excess production or reduced clearance of the amyloid-β (Aβ) peptides in the brain initiates a sequence of events that ultimately lead to Alzheimer's disease and dementia. The Aβ hypothesis has identified BACE1 as a therapeutic target to treat Alzheimer's and led to medicinal chemistry efforts to design its inhibitors both in the pharmaceutical industry and in academia. This review summarizes two distinct categories of inhibitors designed based on conformational states of "closed" and "open" forms of the enzyme. In each category the inhibitors are classified based on the core catalytic interaction group or the aspartyl binding motif (ABM). This review covers the description of inhibitors in each ABM class with X-ray crystal structures of key compounds, their binding modes, related structure-activity data highlighting potency advances, and additional properties such as selectivity profile, P-gp efflux, pharmacokinetic, and pharmacodynamic data.
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Affiliation(s)
- Jing Yuan
- Vitae Pharmaceuticals, 502 W. Office Center Drive, Fort Washington, Pennsylvania 19034, USA
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Lindgren A, Eklund G, Turek D, Malmquist J, Swahn BM, Holenz J, von Berg S, Karlström S, Bueters T. Biotransformation of Two β-Secretase Inhibitors Including Ring Opening and Contraction of a Pyrimidine Ring. Drug Metab Dispos 2013; 41:1134-47. [DOI: 10.1124/dmd.112.050351] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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34
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Butini S, Brogi S, Novellino E, Campiani G, Ghosh AK, Brindisi M, Gemma S. The structural evolution of β-secretase inhibitors: a focus on the development of small-molecule inhibitors. Curr Top Med Chem 2013; 13:1787-807. [PMID: 23931442 PMCID: PMC6034716 DOI: 10.2174/15680266113139990137] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2013] [Accepted: 05/11/2013] [Indexed: 12/12/2022]
Abstract
Effective treatment of Alzheimer's disease (AD) remains a critical unmet need in medicine. The lack of useful treatment for AD led to an intense search for novel therapies based on the amyloid hypothesis, which states that amyloid β-42 (Aβ42) plays an early and crucial role in all cases of AD. β-Secretase (also known as BACE-1 β-site APP-cleaving enzyme, Asp-2 or memapsin-2) is an aspartyl protease representing the rate limiting step in the generation of Aβ peptide fragments, therefore it could represent an important target in the steady hunt for a disease-modifying treatment. Generally, β-secretase inhibitors are grouped into two families: peptidomimetic and nonpeptidomimetic inhibitors. However, irrespective of the class, serious challenges with respect to blood-brain barrier (BBB) penetration and selectivity still remain. Discovering a small molecule inhibitor of β-secretase represents an unnerving challenge but, due to its significant potential as a therapeutic target, growing efforts in this task are evident from both academic and industrial laboratories. In this frame, the rising availability of crystal structures of β-secretase-inhibitor complexes represents an invaluable opportunity for optimization. Nevertheless, beyond the inhibitory activity, the major issue of the current research approaches is about problems associated with BBB penetration and pharmacokinetic properties. This review follows the structural evolution of the early β-secretase inhibitors and gives a snap-shot of the hottest chemical templates in the literature of the last five years, showing research progress in this field.
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Affiliation(s)
- Stefania Butini
- European Research Centre for Drug Discovery and Development (NatSynDrugs), University of Siena, Italy
| | - Simone Brogi
- European Research Centre for Drug Discovery and Development (NatSynDrugs), University of Siena, Italy
| | - Ettore Novellino
- European Research Centre for Drug Discovery and Development (NatSynDrugs), University of Siena, Italy
- Dipartimento di Farmacia, University of Naples Federico II, Italy
| | - Giuseppe Campiani
- European Research Centre for Drug Discovery and Development (NatSynDrugs), University of Siena, Italy
| | - Arun K. Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, Indiana 47907, United States
| | - Margherita Brindisi
- European Research Centre for Drug Discovery and Development (NatSynDrugs), University of Siena, Italy
| | - Sandra Gemma
- European Research Centre for Drug Discovery and Development (NatSynDrugs), University of Siena, Italy
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Hampel H, Lista S. Use of biomarkers and imaging to assess pathophysiology, mechanisms of action and target engagement. J Nutr Health Aging 2013; 17:54-63. [PMID: 23299381 DOI: 10.1007/s12603-013-0003-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Multidisciplinary basic research led to an evolving knowledge of the molecular pathogenesis of Alzheimer's disease (AD). These advances have been translated into defined therapeutic concepts and distinct classes of compounds with putative disease-modifying effects that are now being tested in clinical trials. There is a growing consensus that disease-modifying treatments may be most effective when commenced early in the course and progression of AD pathophysiology, before amyloid deposition and neurodegeneration become too widespread. Biological indicators of pathophysiological mechanisms are required to chart and identify AD in the prodromal phase or, preferably, in asymptomatic individuals. Biomarkers are becoming even more important, owing to the challenges in demonstrating efficacy of candidate-drugs that hit pathophysiological targets using clinical and cognitive outcomes in early AD trials with limited duration. Currently, there is emerging consensus that advances in therapeutic strategies for AD that delay predefined milestones or slow the cognitive and disease progression would considerably decrease the expanding global burden of the disease. To effectively test preventive compounds for AD and bring therapy to affected individuals as early as possible there is an urgent need for a concerted collaboration among worldwide academic institutions, industry, and regulatory bodies with the aim of establishing networks for the identification and qualification of multi-modal biological disease markers.
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Affiliation(s)
- H Hampel
- Department of Psychiatry, Goethe-University of Frankfurt, Frankfurt am Main, Germany.
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Jeppsson F, Eketjäll S, Janson J, Karlström S, Gustavsson S, Olsson LL, Radesäter AC, Ploeger B, Cebers G, Kolmodin K, Swahn BM, von Berg S, Bueters T, Fälting J. Discovery of AZD3839, a potent and selective BACE1 inhibitor clinical candidate for the treatment of Alzheimer disease. J Biol Chem 2012; 287:41245-57. [PMID: 23048024 PMCID: PMC3510823 DOI: 10.1074/jbc.m112.409110] [Citation(s) in RCA: 90] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Revised: 09/24/2012] [Indexed: 01/16/2023] Open
Abstract
β-Site amyloid precursor protein cleaving enzyme1 (BACE1) is one of the key enzymes involved in the processing of the amyloid precursor protein (APP) and formation of amyloid β peptide (Aβ) species. Because cerebral deposition of Aβ species might be critical for the pathogenesis of Alzheimer disease, BACE1 has emerged as a key target for the treatment of this disease. Here, we report the discovery and comprehensive preclinical characterization of AZD3839, a potent and selective inhibitor of human BACE1. AZD3839 was identified using fragment-based screening and structure-based design. In a concentration-dependent manner, AZD3839 inhibited BACE1 activity in a biochemical fluorescence resonance energy transfer (FRET) assay, Aβ and sAPPβ release from modified and wild-type human SH-SY5Y cells and mouse N2A cells as well as from mouse and guinea pig primary cortical neurons. Selectivity against BACE2 and cathepsin D was 14 and >1000-fold, respectively. AZD3839 exhibited dose- and time-dependent lowering of plasma, brain, and cerebrospinal fluid Aβ levels in mouse, guinea pig, and non-human primate. Pharmacokinetic/pharmacodynamic analyses of mouse and guinea pig data showed a good correlation between the potency of AZD3839 in primary cortical neurons and in vivo brain effects. These results suggest that AZD3839 effectively reduces the levels of Aβ in brain, CSF, and plasma in several preclinical species. It might, therefore, have disease-modifying potential in the treatment of Alzheimer disease and related dementias. Based on the overall pharmacological profile and its drug like properties, AZD3839 has been progressed into Phase 1 clinical trials in man.
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Affiliation(s)
- Fredrik Jeppsson
- From the Innovative Medicines AstraZeneca, CNS and Pain, 15185 Södertälje, Sweden
- Science for Life Laboratory, Division of Translational Medicine and Chemical Biology, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, 17165 Solna, Sweden
| | - Susanna Eketjäll
- From the Innovative Medicines AstraZeneca, CNS and Pain, 15185 Södertälje, Sweden
- AstraZeneca Translational Sciences Centre, Science for Life Laboratory, 17165 Solna, Sweden
| | - Juliette Janson
- From the Innovative Medicines AstraZeneca, CNS and Pain, 15185 Södertälje, Sweden
| | - Sofia Karlström
- From the Innovative Medicines AstraZeneca, CNS and Pain, 15185 Södertälje, Sweden
| | - Susanne Gustavsson
- From the Innovative Medicines AstraZeneca, CNS and Pain, 15185 Södertälje, Sweden
| | | | | | - Bart Ploeger
- From the Innovative Medicines AstraZeneca, CNS and Pain, 15185 Södertälje, Sweden
| | - Gvido Cebers
- AstraZeneca Neuroscience, Cambridge, Massachusetts 02139
| | - Karin Kolmodin
- From the Innovative Medicines AstraZeneca, CNS and Pain, 15185 Södertälje, Sweden
| | - Britt-Marie Swahn
- From the Innovative Medicines AstraZeneca, CNS and Pain, 15185 Södertälje, Sweden
| | - Stefan von Berg
- From the Innovative Medicines AstraZeneca, CNS and Pain, 15185 Södertälje, Sweden
| | - Tjerk Bueters
- From the Innovative Medicines AstraZeneca, CNS and Pain, 15185 Södertälje, Sweden
| | - Johanna Fälting
- From the Innovative Medicines AstraZeneca, CNS and Pain, 15185 Södertälje, Sweden
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37
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Butini S, Gabellieri E, Brindisi M, Casagni A, Guarino E, Huleatt PB, Relitti N, La Pietra V, Marinelli L, Giustiniano M, Novellino E, Campiani G, Gemma S. Novel peptidomimetics as BACE-1 inhibitors: synthesis, molecular modeling, and biological studies. Bioorg Med Chem Lett 2012; 23:85-9. [PMID: 23218605 DOI: 10.1016/j.bmcl.2012.11.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2012] [Revised: 10/31/2012] [Accepted: 11/06/2012] [Indexed: 11/30/2022]
Abstract
Aiming at identifying new scaffolds for BACE-1 inhibition devoid of the pharmacokinetic drawbacks of peptide-like structures, we investigated a series of novel peptidomimetics based on a 1,4-benzodiazepine (BDZ) core 1a-h and their seco-analogues 2a-d. We herein discuss synthesis, molecular modeling and in vitro studies which, starting from 1a, led to the seco-analogues (R)-2c and (S)-2d endowed with BACE-1 inhibition properties in the micromolar range both on the isolated enzyme and in cellular studies. These data can encourage to pursue these analogues as hits for the development of a new series of BACE-1 inhibitors active on whole-cells.
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Affiliation(s)
- Stefania Butini
- European Research Centre for Drug Discovery and Development (NatSynDrugs), Università degli Studi di Siena, Via Aldo Moro 2, 53100 Siena, Italy
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38
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Abstract
Significant insights into the function of genes associated with Alzheimer disease and related dementias have occurred through studying genetically modified animals. Although none of the existing models fully reproduces the complete spectrum of this insidious human disease, critical aspects of Alzheimer pathology and disease processes can be experimentally recapitulated. Genetically modified animal models have helped advance our understanding of the underlying mechanisms of disease and have proven to be invaluable in the preclinical evaluation of potential therapeutic interventions. Continuing refinement and evolution to yield the next generation of animal models will facilitate successes in producing greater translational concordance between preclinical studies and human clinical trials and eventually lead to the introduction of novel therapies into clinical practice.
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Affiliation(s)
- Frank M LaFerla
- Institute for Memory Impairments and Neurological Disorders, Department of Neurobiology and Behavior, University of California, Irvine, 92697-4545, USA.
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Wu G, Sankaranarayanan S, Wong J, Tugusheva K, Michener MS, Shi X, Cook JJ, Simon AJ, Savage MJ. Characterization of plasma β-secretase (BACE1) activity and soluble amyloid precursor proteins as potential biomarkers for Alzheimer's disease. J Neurosci Res 2012; 90:2247-58. [PMID: 22987781 DOI: 10.1002/jnr.23122] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2012] [Revised: 07/08/2012] [Accepted: 07/16/2012] [Indexed: 01/14/2023]
Abstract
Reduction in cerebrospinal fluid (CSF) amyloid β42 (Aβ42) and elevation in total tau and phospho-thr181 tau consistently differentiate between Alzheimer's disease (AD) and age-matched control subjects. In contrast, CSF β-site APP-cleaving enzyme activity (BACE1) and soluble amyloid precursor proteins α and β (sAPPα and sAPPβ) are without consistent patterns in AD subjects. Plasma sampling is much easier, with fewer side effects, and is readily applied in primary care centers, so we have developed and validated novel plasma BACE activity, sAPPβ, and sAPPα assays and investigated their ability to distinguish AD from age-matched controls. Plasma BACE activity assay was sensitive and specific, with signal being immunodepleted with a specific BACE1 antibody and inhibited with a BACE1-specific inhibitor. Plasma sAPPβ and sAPPα assays were specific, with signal diluting linearly, immunodepleted with specific antibodies, and at background levels in APP knockout mice. In rhesus monkeys, BACE1 but not γ-secretase inhibitor led to significant lowering of plasma sAPPβ with concurrent elevation of plasma sAPPα. AD subjects showed a significant increase in plasma BACE1 activity, sAPPβ, sAPPα, and Aβ42 (P < 0.001) compared with age-matched controls. In conclusion, plasma BACE activity and sAPP endpoints provide novel investigative biomarkers for AD diagnosis and potential pharmacodynamic biomarkers for secretase inhibitor studies.
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Affiliation(s)
- Guoxin Wu
- Department of Molecular Biomarkers, Merck Research Laboratory, West Point, Pennsylvania, USA.
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40
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Swahn BM, Kolmodin K, Karlström S, von Berg S, Söderman P, Holenz J, Berg S, Lindström J, Sundström M, Turek D, Kihlström J, Slivo C, Andersson L, Pyring D, Rotticci D, Öhberg L, Kers A, Bogar K, von Kieseritzky F, Bergh M, Olsson LL, Janson J, Eketjäll S, Georgievska B, Jeppsson F, Fälting J. Design and Synthesis of β-Site Amyloid Precursor Protein Cleaving Enzyme (BACE1) Inhibitors with in Vivo Brain Reduction of β-Amyloid Peptides. J Med Chem 2012; 55:9346-61. [DOI: 10.1021/jm3009025] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Lise-Lotte Olsson
- Discovery Sciences, AstraZeneca R&D Mölndal, SE-43183 Mölndal, Sweden
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41
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Abstract
Research progress has provided detailed understanding of the molecular pathogenesis of Alzheimer disease (AD). This knowledge has been translated into new drug candidates with putative disease-modifying effects, which are now being tested in clinical trials. The promise of effective therapy has created a great need for biomarkers able to detect AD in the predementia phase, because drugs will probably be effective only if neurodegeneration is not too advanced. In this chapter, cerebrospinal fluid (CSF) and plasma biomarkers are reviewed. The core CSF biomarkers total tau (T-tau), phosphorylated tau (P-tau) and the 42 amino acid form of β-amyloid (Aβ42) reflect AD pathology, and have high diagnostic accuracy to diagnose AD with dementia and prodromal AD in mild cognitive impairment cases. The rationale for the use of CSF biomarkers to identify and monitor the mechanism of action of new drug candidates is also outlined in this chapter.
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Affiliation(s)
- Kaj Blennow
- Clinical Neurochemistry Laboratory, Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry, The Sahlgrenska Academy at University of Gothenburg, Sahlgrenska University Hospital, Mölndal, SE-431 80 Mölndal, Sweden.
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Wood S, Wen PH, Zhang J, Zhu L, Luo Y, Babu-Khan S, Chen K, Pham R, Esmay J, Dineen TA, Kaller MR, Weiss MM, Hitchcock SA, Citron M, Zhong W, Hickman D, Williamson T. Establishing the Relationship between In Vitro Potency, Pharmacokinetic, and Pharmacodynamic Parameters in a Series of Orally Available, Hydroxyethylamine-Derived β-Secretase Inhibitors. J Pharmacol Exp Ther 2012; 343:460-7. [DOI: 10.1124/jpet.112.197954] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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Hamada Y, Kiso Y. The application of bioisosteres in drug design for novel drug discovery: focusing on acid protease inhibitors. Expert Opin Drug Discov 2012; 7:903-22. [PMID: 22873630 DOI: 10.1517/17460441.2012.712513] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION A bioisostere is a powerful concept for medicinal chemistry. It allows the improvement of the stability; oral absorption; membrane permeability; and absorption, distribution, metabolism and excretion (ADME) of drug candidate, while retaining their biological properties. The term 'bioisostere' is derived from 'isostere', whose physical and chemical properties, such as steric size, hydrophobicity, and electronegativity, are similar to those of a functional or atomic group, and is considered to possess biological properties. Here, the authors highlight the recent applications of bioisosteres in drug design, mainly based on our drug discovery studies. AREAS COVERED This review discusses the application of bioisosteres for novel drug discovery with focus on the authors' drug discovery studies such as renin, HIV-protease, and β-secretase inhibitors. The authors highlight that some bioisosteres can form the scaffolding for drug candidates, namely substrate transition state, amide/ester, and carboxylic acid bioisosteres. Moreover, the authors propose the new terms 'electron-donor bioisostere' and 'conformational bioisostere' for drug discovery. EXPERT OPINION The authors discuss the importance of bioisostere's design concept based on specific interaction with the corresponding biomolecule. In addition, some strategies for drug discovery based on the bioisostere concept are introduced. Many bioisosteres, which are recognized by corresponding target biomolecules as exhibiting similar biological properties, have been reported to date; most of the recently developed bioisosteres were designed by cheminformatics approaches. Some molecular design softwares and databases are introduced.
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Affiliation(s)
- Yoshio Hamada
- Faculty of Pharmaceutical Sciences , Kobe Gakuin University, Minatojima, Chuo-ku, Kobe, Japan
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44
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Lu Y, Riddell D, Hajos-Korcsok E, Bales K, Wood KM, Nolan CE, Robshaw AE, Zhang L, Leung L, Becker SL, Tseng E, Barricklow J, Miller EH, Osgood S, O'Neill BT, Brodney MA, Johnson DS, Pettersson M. Cerebrospinal fluid amyloid-β (Aβ) as an effect biomarker for brain Aβ lowering verified by quantitative preclinical analyses. J Pharmacol Exp Ther 2012; 342:366-75. [PMID: 22562771 PMCID: PMC11047765 DOI: 10.1124/jpet.112.192625] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2012] [Accepted: 04/27/2012] [Indexed: 01/01/2023] Open
Abstract
Reducing the generation of amyloid-β (Aβ) in the brain via inhibition of β-secretase or inhibition/modulation of γ-secretase has been pursued as a potential disease-modifying treatment for Alzheimer's disease. For the discovery and development of β-secretase inhibitors (BACEi), γ-secretase inhibitors (GSI), and γ-secretase modulators (GSM), Aβ in cerebrospinal fluid (CSF) has been presumed to be an effect biomarker for Aβ lowering in the brain. However, this presumption is challenged by the lack of quantitative understanding of the relationship between brain and CSF Aβ lowering. In this study, we strived to elucidate how the intrinsic pharmacokinetic (PK)/pharmacodynamic (PD) relationship for CSF Aβ lowering is related to that for brain Aβ through quantitative modeling of preclinical data for numerous BACEi, GSI, and GSM across multiple species. Our results indicate that the intrinsic PK/PD relationship in CSF is predictive of that in brain, at least in the postulated pharmacologically relevant range, with excellent consistency across mechanisms and species. As such, the validity of CSF Aβ as an effect biomarker for brain Aβ lowering is confirmed preclinically. Meanwhile, we have been able to reproduce the dose-dependent separation between brain and CSF effect profiles using simulations. We further discuss the implications of our findings to drug discovery and development with regard to preclinical PK/PD characterization and clinical prediction of Aβ lowering in the brain.
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Affiliation(s)
- Yasong Lu
- MS#220-4546, Department of Pharmacokinetics, Dynamics and Metabolism, Pfizer Worldwide Research and Development, Eastern Point Road, Groton, CT 06340, USA.
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45
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Probst G, Xu YZ. Small-molecule BACE1 inhibitors: a patent literature review (2006 - 2011). Expert Opin Ther Pat 2012; 22:511-40. [PMID: 22512789 DOI: 10.1517/13543776.2012.681302] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
INTRODUCTION Alzheimer's disease is a devastating neurodegenerative disorder for which no disease-modifying therapy exists. The amyloid hypothesis, which implicates Aβ as the toxin initiating a biological cascade leading to neurodegeneration, is the most prominent theory concerning the underlying cause of the disease. BACE1 is one of two aspartyl proteinases that generate Aβ, thus inhibition of BACE1 has the potential to ameliorate the progression of Alzheimer's disease by abating the production of Aβ. AREAS COVERED This review chronicles small-molecule BACE1 inhibitors as described in the patent literature between 2006 and 2011 and their potential use as disease-modifying treatments for Alzheimer's disease. Over the past half a dozen years, numerous BACE1 inhibitors have been published in the patent applications, but often these contain a paltry amount of pertinent biological data (e.g. potency, selectivity, and efficacy). Fortunately, numerous relevant publications containing important data have appeared in the journal literature during this period. The goal in this effort was to create an amalgam of the two records to add value to this review. EXPERT OPINION The pharmaceutical industry has made tremendous progress in the development of small-molecule BACE1 inhibitors that lower Aβ in the central nervous system. Assuming the amyloid hypothesis is veracious, we anticipate a disease-modifying therapy to combat Alzheimer's disease is near.
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Affiliation(s)
- Gary Probst
- Elan Pharmaceuticals, Molecular Design, 180 Oyster Point Boulevard, South San Francisco, CA 94080, USA.
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Rueeger H, Lueoend R, Rogel O, Rondeau JM, Möbitz H, Machauer R, Jacobson L, Staufenbiel M, Desrayaud S, Neumann U. Discovery of Cyclic Sulfone Hydroxyethylamines as Potent and Selective β-Site APP-Cleaving Enzyme 1 (BACE1) Inhibitors: Structure-Based Design and in Vivo Reduction of Amyloid β-Peptides. J Med Chem 2012; 55:3364-86. [DOI: 10.1021/jm300069y] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Heinrich Rueeger
- Department
of Global Discovery Chemistry, ‡Structural Biology Platform, §Department of Neuroscience, and ∥Metabolism and
Pharmacokinetics, Institutes for BioMedical Research, Novartis Pharma AG, CH-4057 Basel, Switzerland
| | - Rainer Lueoend
- Department
of Global Discovery Chemistry, ‡Structural Biology Platform, §Department of Neuroscience, and ∥Metabolism and
Pharmacokinetics, Institutes for BioMedical Research, Novartis Pharma AG, CH-4057 Basel, Switzerland
| | - Olivier Rogel
- Department
of Global Discovery Chemistry, ‡Structural Biology Platform, §Department of Neuroscience, and ∥Metabolism and
Pharmacokinetics, Institutes for BioMedical Research, Novartis Pharma AG, CH-4057 Basel, Switzerland
| | - Jean-Michel Rondeau
- Department
of Global Discovery Chemistry, ‡Structural Biology Platform, §Department of Neuroscience, and ∥Metabolism and
Pharmacokinetics, Institutes for BioMedical Research, Novartis Pharma AG, CH-4057 Basel, Switzerland
| | - Henrik Möbitz
- Department
of Global Discovery Chemistry, ‡Structural Biology Platform, §Department of Neuroscience, and ∥Metabolism and
Pharmacokinetics, Institutes for BioMedical Research, Novartis Pharma AG, CH-4057 Basel, Switzerland
| | - Rainer Machauer
- Department
of Global Discovery Chemistry, ‡Structural Biology Platform, §Department of Neuroscience, and ∥Metabolism and
Pharmacokinetics, Institutes for BioMedical Research, Novartis Pharma AG, CH-4057 Basel, Switzerland
| | - Laura Jacobson
- Department
of Global Discovery Chemistry, ‡Structural Biology Platform, §Department of Neuroscience, and ∥Metabolism and
Pharmacokinetics, Institutes for BioMedical Research, Novartis Pharma AG, CH-4057 Basel, Switzerland
| | - Matthias Staufenbiel
- Department
of Global Discovery Chemistry, ‡Structural Biology Platform, §Department of Neuroscience, and ∥Metabolism and
Pharmacokinetics, Institutes for BioMedical Research, Novartis Pharma AG, CH-4057 Basel, Switzerland
| | - Sandrine Desrayaud
- Department
of Global Discovery Chemistry, ‡Structural Biology Platform, §Department of Neuroscience, and ∥Metabolism and
Pharmacokinetics, Institutes for BioMedical Research, Novartis Pharma AG, CH-4057 Basel, Switzerland
| | - Ulf Neumann
- Department
of Global Discovery Chemistry, ‡Structural Biology Platform, §Department of Neuroscience, and ∥Metabolism and
Pharmacokinetics, Institutes for BioMedical Research, Novartis Pharma AG, CH-4057 Basel, Switzerland
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Cisterna magna cannulated repeated CSF sampling rat model – effects of a gamma-secretase inhibitor on Aβ levels. J Neurosci Methods 2012; 205:36-44. [DOI: 10.1016/j.jneumeth.2011.12.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2011] [Revised: 12/19/2011] [Accepted: 12/20/2011] [Indexed: 11/17/2022]
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Dislich B, Lichtenthaler SF. The Membrane-Bound Aspartyl Protease BACE1: Molecular and Functional Properties in Alzheimer's Disease and Beyond. Front Physiol 2012; 3:8. [PMID: 22363289 PMCID: PMC3281277 DOI: 10.3389/fphys.2012.00008] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 01/11/2012] [Indexed: 12/31/2022] Open
Abstract
The β-site APP cleaving enzyme 1 (BACE1) is a transmembrane aspartyl protease involved in Alzheimer’s disease (AD) pathogenesis and in myelination. BACE1 initiates the generation of the pathogenic amyloid β-peptide, which makes BACE1 a major drug target for AD. BACE1 also cleaves and activates neuregulin 1, thereby contributing to postnatal myelination, in particular in the peripheral nervous system. Additional proteins are also cleaved by BACE1, but less is known about the physiological consequences of their cleavage. Recently, new phenotypes were described in BACE1-deficient mice. Although it remains unclear through which BACE1 substrates they are mediated, the phenotypes suggest a versatile role of this protease for diverse physiological processes. This review summarizes the enzymatic and cellular properties of BACE1 as well as its regulation by lipids, by transcriptional, and by translational mechanisms. The main focus will be on the recent progress in understanding BACE1 function and its implication for potential mechanism-based side effects upon therapeutic inhibition.
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Affiliation(s)
- Bastian Dislich
- German Center for Neurodegenerative Diseases (DZNE) Munich, Germany
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49
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Mattsson N, Rajendran L, Zetterberg H, Gustavsson M, Andreasson U, Olsson M, Brinkmalm G, Lundkvist J, Jacobson LH, Perrot L, Neumann U, Borghys H, Mercken M, Dhuyvetter D, Jeppsson F, Blennow K, Portelius E. BACE1 inhibition induces a specific cerebrospinal fluid β-amyloid pattern that identifies drug effects in the central nervous system. PLoS One 2012; 7:e31084. [PMID: 22328928 PMCID: PMC3273469 DOI: 10.1371/journal.pone.0031084] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Accepted: 01/01/2012] [Indexed: 12/17/2022] Open
Abstract
BACE1 is a key enzyme for amyloid-β (Aβ) production, and an attractive therapeutic target in Alzheimer's disease (AD). Here we report that BACE1 inhibitors have distinct effects on neuronal Aβ metabolism, inducing a unique pattern of secreted Aβ peptides, analyzed in cell media from amyloid precursor protein (APP) transfected cells and in cerebrospinal fluid (CSF) from dogs by immunoprecipitation-mass spectrometry, using several different BACE1 inhibitors. Besides the expected reductions in Aβ1-40 and Aβ1-42, treatment also changed the relative levels of several other Aβ isoforms. In particular Aβ1-34 decreased, while Aβ5-40 increased, and these changes were more sensitive to BACE1 inhibition than the changes in Aβ1-40 and Aβ1-42. The effects on Aβ5-40 indicate the presence of a BACE1 independent pathway of APP degradation. The described CSF Aβ pattern may be used as a pharmacodynamic fingerprint to detect biochemical effects of BACE1-therapies in clinical trials, which might accelerate development of novel therapies.
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Affiliation(s)
- Niklas Mattsson
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Lawrence Rajendran
- Systems and Cell Biology of Neurodegeneration, Division of Psychiatry Research, University of Zurich, Zurich, Switzerland
| | - Henrik Zetterberg
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Mikael Gustavsson
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Ulf Andreasson
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Maria Olsson
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Gunnar Brinkmalm
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Johan Lundkvist
- Innovative Medicines, Central Nervous System and Pain iMed, Department of Neuroscience, AstraZeneca R&D, Södertälje, Sweden
| | - Laura H. Jacobson
- Neuroscience Discovery, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Ludovic Perrot
- Neuroscience Discovery, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Ulf Neumann
- Neuroscience Discovery, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Herman Borghys
- Neuroscience Therapeutic Area, Janssen Research and Development, Beerse, Belgium
| | - Marc Mercken
- Neuroscience Therapeutic Area, Janssen Research and Development, Beerse, Belgium
| | - Deborah Dhuyvetter
- Neuroscience Therapeutic Area, Janssen Research and Development, Beerse, Belgium
| | - Fredrik Jeppsson
- Innovative Medicines, Central Nervous System and Pain iMed, Department of Neuroscience, AstraZeneca R&D, Södertälje, Sweden
| | - Kaj Blennow
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Erik Portelius
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
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50
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Ghosh AK, Brindisi M, Tang J. Developing β-secretase inhibitors for treatment of Alzheimer's disease. J Neurochem 2011; 120 Suppl 1:71-83. [PMID: 22122681 DOI: 10.1111/j.1471-4159.2011.07476.x] [Citation(s) in RCA: 204] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
β-Secretase (memapsin 2; BACE-1) is the first protease in the processing of amyloid precursor protein leading to the production of amyloid-β (Aβ) in the brain. It is believed that high levels of brain Aβ are responsible for the pathogenesis of Alzheimer's disease (AD). Therefore, β-secretase is a major therapeutic target for the development of inhibitor drugs. During the past decade, steady progress has been made in the evolution of β-secretase inhibitors toward better drug properties. Recent inhibitors are potent, selective and have been shown to penetrate the blood-brain barrier to inhibit Aβ levels in the brains of experimental animals. Moreover, continuous administration of a β-secretase inhibitor was shown to rescue age-related cognitive decline in transgenic AD mice. A small number of β-secretase inhibitors have also entered early phase clinical trials. These developments offer some optimism for the clinical development of a disease-modifying drug for AD.
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Affiliation(s)
- Arun K Ghosh
- Departments of Chemistry and Medicinal Chemistry, Purdue University, West Lafayette, Indiana, USA
| | - Margherita Brindisi
- Departments of Chemistry and Medicinal Chemistry, Purdue University, West Lafayette, Indiana, USA
| | - Jordan Tang
- Protein Studies Program, Oklahoma Medical Research Foundation, University of Oklahoma Health Science Center, Oklahoma City, Oklahoma, USA
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