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Selkoe DJ. The advent of Alzheimer treatments will change the trajectory of human aging. NATURE AGING 2024; 4:453-463. [PMID: 38641654 DOI: 10.1038/s43587-024-00611-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Accepted: 03/08/2024] [Indexed: 04/21/2024]
Abstract
Slowing neurodegenerative disorders of late life has lagged behind progress on other chronic diseases. But advances in two areas, biochemical pathology and human genetics, have now identified early pathogenic events, enabling molecular hypotheses and disease-modifying treatments. A salient example is the discovery that antibodies to amyloid ß-protein, long debated as a causative factor in Alzheimer's disease (AD), clear amyloid plaques, decrease levels of abnormal tau proteins and slow cognitive decline. Approval of amyloid antibodies as the first disease-modifying treatments means a gradually rising fraction of the world's estimated 60 million people with symptomatic disease may decline less or even stabilize. Society is entering an era in which the unchecked devastation of AD is no longer inevitable. This Perspective considers the impact of slowing AD and other neurodegenerative disorders on the trajectory of aging, allowing people to survive into late life with less functional decline. The implications of this moment for medicine and society are profound.
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Affiliation(s)
- Dennis J Selkoe
- Ann Romney Center for Neurologic Diseases Brigham and Women's Hospital Harvard Medical School, Boston, MA, USA.
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2
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Chen SY, Koch M, Chávez-Gutiérrez L, Zacharias M. How Modulator Binding at the Amyloidβ-γ-Secretase Interface Enhances Substrate Binding and Attenuates Membrane Distortion. J Med Chem 2023; 66:16772-16782. [PMID: 38059872 DOI: 10.1021/acs.jmedchem.3c01480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
Inhibition of γ-secretase, an intramembrane protease, to reduce secretion of Amyloid-β (Aβ) peptides has been considered for treating Alzheimer's disease. However, γ-secretase inhibitors suffer from severe side effects. As an alternative, γ-secretase modulators (GSM) reduce the generation of toxic peptides by enhancing the cleavage processivity without diminishing the enzyme activity. Starting from a known γ-secretase structure without substrate but in complex with an E2012 GSM, we generated a structural model that included a bound Aβ43 peptide and studied interactions among enzyme, substrate, GSM, and lipids. Our result suggests that E2012 binding at the enzyme-substrate-membrane interface attenuates the membrane distortion by shielding the substrate-membrane interaction. The model predicts that the E2012 modulation is charge-dependent and explains the preserved hydrogen acceptor and the aromatic ring observed in many imidazole-based GSM. Predicted effects of γ-secretase mutations on E2012 modulation were confirmed experimentally. We anticipate that the study will facilitate the future development of effective GSMs.
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Affiliation(s)
- Shu-Yu Chen
- Center for Functional Protein Assemblies, Garching 85748, Germany
| | - Matthias Koch
- VIB/KU Leuven, VIB-KU Leuven Center for Brain & Disease Research, Leuven 3000, Belgium
| | | | - Martin Zacharias
- Center for Functional Protein Assemblies, Garching 85748, Germany
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3
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Targeting PSEN1 by lnc-CYP3A43-2/miR-29b-2-5p to Reduce β Amyloid Plaque Formation and Improve Cognition Function. Int J Mol Sci 2022; 23:ijms231810554. [PMID: 36142465 PMCID: PMC9506169 DOI: 10.3390/ijms231810554] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 09/06/2022] [Accepted: 09/07/2022] [Indexed: 11/17/2022] Open
Abstract
Presenilin-1 (PSEN1) is a crucial subunit within the γ-secretase complex and regulates β-amyloid (Aβ) production. Accumulated evidence indicates that n-butylidenephthalide (BP) acts effectively to reduce Aβ levels in neuronal cells that are derived from trisomy 21 (Ts21) induced pluripotent stem cells (iPSCs). However, the mechanism underlying this effect remains unclear. This article aims to investigate the possible mechanisms through which BP ameliorates the development of Alzheimer's disease (AD) and verify the effectiveness of BP through animal experiments. Results from RNA microarray analysis showed that BP treatment in Ts21 iPSC-derived neuronal cells reduced long noncoding RNA (lncRNA) CYP3A43-2 levels and increased microRNA (miR)-29b-2-5p levels. Bioinformatics tool prediction analysis, biotin-labeled miR-29b-2-5p pull-down assay, and dual-luciferase reporter assay confirmed a direct negative regulatory effect for miRNA29b-2-5p on lnc-RNA-CYP3A43-2 and PSEN1. Moreover, BP administration improved short-term memory and significantly reduced Aβ accumulation in the hippocampus and cortex of 3xTg-AD mice but failed in miR-29b-2-5p mutant mice generated by CRISP/Cas9 technology. In addition, analysis of brain samples from patients with AD showed a decrease in microRNA-29b-2-5p expression in the frontal cortex region. Our results provide evidence that the LncCYP3A43-2/miR29-2-5p/PSEN1 network might be involved in the molecular mechanisms underlying BP-induced Aβ reduction.
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4
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Hur JY. γ-Secretase in Alzheimer's disease. Exp Mol Med 2022; 54:433-446. [PMID: 35396575 PMCID: PMC9076685 DOI: 10.1038/s12276-022-00754-8] [Citation(s) in RCA: 82] [Impact Index Per Article: 41.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2021] [Revised: 01/05/2022] [Accepted: 01/20/2022] [Indexed: 12/16/2022] Open
Abstract
Alzheimer's disease (AD) is caused by synaptic and neuronal loss in the brain. One of the characteristic hallmarks of AD is senile plaques containing amyloid β-peptide (Aβ). Aβ is produced from amyloid precursor protein (APP) by sequential proteolytic cleavages by β-secretase and γ-secretase, and the polymerization of Aβ into amyloid plaques is thought to be a key pathogenic event in AD. Since γ-secretase mediates the final cleavage that liberates Aβ, γ-secretase has been widely studied as a potential drug target for the treatment of AD. γ-Secretase is a transmembrane protein complex containing presenilin, nicastrin, Aph-1, and Pen-2, which are sufficient for γ-secretase activity. γ-Secretase cleaves >140 substrates, including APP and Notch. Previously, γ-secretase inhibitors (GSIs) were shown to cause side effects in clinical trials due to the inhibition of Notch signaling. Therefore, more specific regulation or modulation of γ-secretase is needed. In recent years, γ-secretase modulators (GSMs) have been developed. To modulate γ-secretase and to understand its complex biology, finding the binding sites of GSIs and GSMs on γ-secretase as well as identifying transiently binding γ-secretase modulatory proteins have been of great interest. In this review, decades of findings on γ-secretase in AD are discussed.
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Affiliation(s)
- Ji-Yeun Hur
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY, 10065, USA.
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5
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Santiago Á, Guzmán-Ocampo DC, Aguayo-Ortiz R, Dominguez L. Characterizing the Chemical Space of γ-Secretase Inhibitors and Modulators. ACS Chem Neurosci 2021; 12:2765-2775. [PMID: 34291906 DOI: 10.1021/acschemneuro.1c00313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
γ-Secretase (GS) is one of the most attractive molecular targets for the treatment of Alzheimer's disease (AD). Its key role in the final step of amyloid-β peptides generation and its relationship in the cascade of events for disease development have caught the attention of many pharmaceutical groups. Over the past years, different inhibitors and modulators have been evaluated as promising therapeutics against AD. However, despite the great chemical diversity of the reported compounds, a global classification and visual representation of the chemical space for GS inhibitors and modulators remain unavailable. In the present work, we carried out a two-dimensional (2D) chemical space analysis from different classes and subclasses of GS inhibitors and modulators based on their structural similarity. Along with the novel structural information available for GS complexes, our analysis opens the possibility to identify compounds with high molecular similarity, critical to finding new chemical structures through the optimization of existing compounds and relating them with a potential binding site.
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Affiliation(s)
- Ángel Santiago
- Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Dulce C. Guzmán-Ocampo
- Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Rodrigo Aguayo-Ortiz
- Departamento de Farmacia, Facultad de Química, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
| | - Laura Dominguez
- Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, Mexico City 04510, Mexico
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6
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Kikuchi K, Tatebe T, Sudo Y, Yokoyama M, Kidana K, Chiu YW, Takatori S, Arita M, Hori Y, Tomita T. GPR120 Signaling Controls Amyloid-β Degrading Activity of Matrix Metalloproteinases. J Neurosci 2021; 41:6173-6185. [PMID: 34099509 PMCID: PMC8276734 DOI: 10.1523/jneurosci.2595-20.2021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Revised: 05/16/2021] [Accepted: 05/26/2021] [Indexed: 11/21/2022] Open
Abstract
Alzheimer's disease (AD) is characterized by the extensive deposition of amyloid-β peptide (Aβ) in the brain. Brain Aβ level is regulated by a balance between Aβ production and clearance. The clearance rate of Aβ is decreased in the brains of sporadic AD patients, indicating that the dysregulation of Aβ clearance mechanisms affects the pathologic process of AD. Astrocytes are among the most abundant cells in the brain and are implicated in the clearance of brain Aβ via their regulation of the blood-brain barrier, glymphatic system, and proteolytic degradation. The cellular morphology and activity of astrocytes are modulated by several molecules, including ω3 polyunsaturated fatty acids, such as docosahexaenoic acid, which is one of the most abundant lipids in the brain, via the G protein-coupled receptor GPR120/FFAR4. In this study, we analyzed the role of GPR120 signaling in the Aβ-degrading activity of astrocytes. Treatment with the selective antagonist upregulated the matrix metalloproteinase (MMP) inhibitor-sensitive Aβ-degrading activity in primary astrocytes. Moreover, the inhibition of GPR120 signaling increased the levels of Mmp2 and Mmp14 mRNAs, and decreased the expression levels of tissue inhibitor of metalloproteinases 3 (Timp3) and Timp4, suggesting that GPR120 negatively regulates the astrocyte-derived MMP network. Finally, the intracerebral injection of GPR120-specific antagonist substantially decreased the levels of TBS-soluble Aβ in male AD model mice, and this effect was canceled by the coinjection of an MMP inhibitor. These data indicate that astrocytic GPR120 signaling negatively regulates the Aβ-degrading activity of MMPs.SIGNIFICANCE STATEMENT The level of amyloid β (Aβ) in the brain is a crucial determinant of the development of Alzheimer's disease. Here we found that astrocytes, which are the most abundant cell type in the CNS, harbor degrading activity against Aβ, which is regulated by GPR120 signaling. GPR120 is involved in the inflammatory response and obesity in peripheral organs. However, the pathophysiological role of GPR120 in Alzheimer's disease remains unknown. We found that selective inhibition of GPR120 signaling in astrocytes increased the Aβ-degrading activity of matrix metalloproteases. Our results suggest that GPR120 in astrocytes is a novel therapeutic target for the development of anti-Aβ therapeutics.
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Affiliation(s)
- Kazunori Kikuchi
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Takuya Tatebe
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan
- Faculty of Pharmaceutical Sciences, Teikyo Heisei University, Tokyo, 164-8530, Japan
| | - Yuki Sudo
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Miyabishara Yokoyama
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Kiwami Kidana
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan
- Department of Home Care Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Yung Wen Chiu
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Sho Takatori
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Makoto Arita
- Division of Physiological Chemistry and Metabolism, Graduate School of Pharmaceutical Sciences, Keio University, Tokyo, 105-8512, Japan
- Laboratory for Metabolomics, RIKEN Center for Integrative Medical Sciences, Kanagawa, 230-0045, Japan
| | - Yukiko Hori
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Taisuke Tomita
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan
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7
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Liu L, Lauro BM, Wolfe MS, Selkoe DJ. Hydrophilic loop 1 of Presenilin-1 and the APP GxxxG transmembrane motif regulate γ-secretase function in generating Alzheimer-causing Aβ peptides. J Biol Chem 2021; 296:100393. [PMID: 33571524 PMCID: PMC7961089 DOI: 10.1016/j.jbc.2021.100393] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2020] [Revised: 01/22/2021] [Accepted: 02/04/2021] [Indexed: 02/06/2023] Open
Abstract
γ-Secretase is responsible for the proteolysis of amyloid precursor protein (APP) into amyloid-beta (Aβ) peptides, which are centrally implicated in the pathogenesis of Alzheimer’s disease (AD). The biochemical mechanism of how processing by γ-secretase is regulated, especially as regards the interaction between enzyme and substrate, remains largely unknown. Here, mutagenesis reveals that the hydrophilic loop-1 (HL-1) of presenilin-1 (PS1) is critical for both γ-secretase step-wise cleavages (processivity) and its allosteric modulation by heterocyclic γ-modulatory compounds. Systematic mutagenesis of HL-1, including all of its familial AD mutations and additional engineered variants, and quantification of the resultant Aβ products show that HL-1 is necessary for proper sequential γ-secretase processivity. We identify Y106, L113, and Y115 in HL-1 as key targets for heterocyclic γ-secretase modulators (GSMs) to stimulate processing of pathogenic Aβ peptides. Further, we confirm that the GxxxG domain in the APP transmembrane region functions as a critical substrate motif for γ-secretase processivity: a G29A substitution in APP-C99 mimics the beneficial effects of GSMs. Together, these findings provide a molecular basis for the structural regulation of γ-processivity by enzyme and substrate, facilitating the rational design of new GSMs that lower AD-initiating amyloidogenic Aβ peptides.
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Affiliation(s)
- Lei Liu
- Ann Romney Center for Neurologic Diseases, Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Bianca M Lauro
- Ann Romney Center for Neurologic Diseases, Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Michael S Wolfe
- Department of Medical Chemistry, University of Kansas School of Pharmacy, Lawrence, Kansas, USA
| | - Dennis J Selkoe
- Ann Romney Center for Neurologic Diseases, Department of Neurology, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts, USA.
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8
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Mehra R, Kepp KP. Computational prediction and molecular mechanism of γ-secretase modulators. Eur J Pharm Sci 2021; 157:105626. [DOI: 10.1016/j.ejps.2020.105626] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 10/21/2020] [Accepted: 10/23/2020] [Indexed: 12/13/2022]
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9
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Mekala S, Nelson G, Li YM. Recent developments of small molecule γ-secretase modulators for Alzheimer's disease. RSC Med Chem 2020; 11:1003-1022. [PMID: 33479693 PMCID: PMC7513388 DOI: 10.1039/d0md00196a] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 07/29/2020] [Indexed: 12/30/2022] Open
Abstract
Alzheimer's disease (AD) is the most common form of progressive neurodegenerative disorder, marked by memory loss and a decline in cognitive function. The major hallmarks of AD are the presence of intracellular neurofibrillary tau tangles (NFTs) composed of hyperphosphorylated tau proteins and extracellular plaques composed of amyloid beta peptides (Aβ). The amyloid (Aβ) cascade hypothesis proposes that the AD pathogenesis is initiated by the accumulation of Aβ peptides in the parenchyma of the brain. An aspartyl intramembranal protease called γ-secretase is responsible for the production of Aβ by the cleavage of the amyloid precursor protein (APP). Clinical studies of γ-secretase inhibitors (GSIs) for AD failed due to the lack of substrate specificity. Therefore, γ-secretase modulators (GSMs) have been developed as potential disease modifying agents to modulate the γ-secretase cleavage activity towards the production of toxic Aβ42 peptides. Following the first-generation 'nonsteroidal anti-inflammatory drug' (NSAID) based GSMs, second-generation GSMs (carboxylic acid based NSAID derivatives and non-NSAID derived heterocyclic analogues), as well as natural product-based GSMs, have been developed. In this review, we focus on the recent developments of small molecule-based GSMs that show potential improvements in terms of drug-like properties as well as their current status in human clinical trials and the future perspectives of GSM research.
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Affiliation(s)
- Shekar Mekala
- Chemical Biology Program , Memorial Sloan-Kettering Cancer Center , 1275 York Avenue , New York , New York 10065 , USA . ;
| | - Grady Nelson
- Chemical Biology Program , Memorial Sloan-Kettering Cancer Center , 1275 York Avenue , New York , New York 10065 , USA . ;
| | - Yue-Ming Li
- Chemical Biology Program , Memorial Sloan-Kettering Cancer Center , 1275 York Avenue , New York , New York 10065 , USA . ;
- Pharmacology Graduate Program , Weill Graduate School of Medical Sciences of Cornell University , New York , New York 10021 , USA
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10
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Zhao J, Liu X, Xia W, Zhang Y, Wang C. Targeting Amyloidogenic Processing of APP in Alzheimer's Disease. Front Mol Neurosci 2020; 13:137. [PMID: 32848600 PMCID: PMC7418514 DOI: 10.3389/fnmol.2020.00137] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2020] [Accepted: 07/08/2020] [Indexed: 12/11/2022] Open
Abstract
Alzheimer's disease (AD) is the most common type of senile dementia, characterized by neurofibrillary tangle and amyloid plaque in brain pathology. Major efforts in AD drug were devoted to the interference with the production and accumulation of amyloid-β peptide (Aβ), which plays a causal role in the pathogenesis of AD. Aβ is generated from amyloid precursor protein (APP), by consecutive cleavage by β-secretase and γ-secretase. Therefore, β-secretase and γ-secretase inhibition have been the focus for AD drug discovery efforts for amyloid reduction. Here, we review β-secretase inhibitors and γ-secretase inhibitors/modulators, and their efficacies in clinical trials. In addition, we discussed the novel concept of specifically targeting the γ-secretase substrate APP. Targeting amyloidogenic processing of APP is still a fundamentally sound strategy to develop disease-modifying AD therapies and recent advance in γ-secretase/APP complex structure provides new opportunities in designing selective inhibitors/modulators for AD.
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Affiliation(s)
- Jing Zhao
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, United States
| | - Xinyue Liu
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, United States
| | - Weiming Xia
- Geriatric Research Education Clinical Center, Edith Nourse Rogers Memorial Veterans Hospital, Bedford, MA, United States
- Department of Pharmacology and Experimental Therapeutics, School of Medicine, Boston University, Boston, MA, United States
| | - Yingkai Zhang
- Department of Chemistry, New York University, New York, NY, United States
| | - Chunyu Wang
- Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, NY, United States
- Department of Biological Sciences, Rensselaer Polytechnic Institute, Troy, NY, United States
- Department of Chemistry and Chemical Biology, Rensselaer Polytechnic Institute, Troy, NY, United States
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11
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Funamoto S, Tagami S, Okochi M, Morishima-Kawashima M. Successive cleavage of β-amyloid precursor protein by γ-secretase. Semin Cell Dev Biol 2020; 105:64-74. [PMID: 32354467 DOI: 10.1016/j.semcdb.2020.04.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Revised: 04/05/2020] [Accepted: 04/07/2020] [Indexed: 12/12/2022]
Abstract
γ-Secretase is a multimeric aspartyl protease that cleaves the membrane-spanning region of the β-carboxyl terminal fragment (βCTF) generated from β-amyloid precursor protein. γ-Secretase defines the generated molecular species of amyloid β-protein (Aβ), a critical molecule in the pathogenesis of Alzheimer's disease (AD). Many therapeutic trials for AD have targeted γ-secretase. However, in contrast to the great efforts in drug discovery, the enzymatic features and cleavage mechanism of γ-secretase are poorly understood. Here we review our protein-chemical analyses of the cleavage products generated from βCTF by γ-secretase, which revealed that Aβ was produced by γ-secretase through successive cleavages of βCTF, mainly at three-residue intervals. Two representative product lines were identified. ε-Cleavages occur first at Leu49-Val50 and Thr48-Leu49 of βCTF (in accordance with Aβ numbering). Longer generated Aβs, Aβ49 and Aβ48, are precursors to the majority of Aβ40 and Aβ42, concomitantly releasing the tripeptides, ITL, VIV, and IAT; and VIT and TVI, respectively. A portion of Aβ42 is processed further to Aβ38, releasing a tetrapeptide, VVIA. The presence of additional multiple minor pathways may reflect labile cleavage activities derived from the conformational flexibility of γ-secretase through molecular interactions. Because these peptide byproducts are not secreted and remain within the cells, they may serve as an indicator that reflects γ-secretase activity more directly than secreted Aβ.
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Affiliation(s)
- Satoru Funamoto
- Department of Neuropathology, Graduate School of Life and Medical Sciences, Doshisha University, Kyoto, Japan
| | - Shinji Tagami
- Neuropsychiatry, Department of Integrated Medicine, Division of Internal Medicine, Osaka University Graduate School of Medicine, Suita, Japan
| | - Masayasu Okochi
- Neuropsychiatry, Department of Integrated Medicine, Division of Internal Medicine, Osaka University Graduate School of Medicine, Suita, Japan
| | - Maho Morishima-Kawashima
- Laboratory of Neuroscience, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan.
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12
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Nie P, Vartak A, Li YM. γ-Secretase inhibitors and modulators: Mechanistic insights into the function and regulation of γ-Secretase. Semin Cell Dev Biol 2020; 105:43-53. [PMID: 32249070 DOI: 10.1016/j.semcdb.2020.03.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Revised: 03/10/2020] [Accepted: 03/11/2020] [Indexed: 02/08/2023]
Abstract
Over two decades, γ-secretase has been the target for extensive therapeutic development due to its pivotal role in pathogenesis of Alzheimer's disease and cancer. However, it has proven to be a challenging task owing to its large set of substrates and our limited understanding of the enzyme's structural and mechanistic features. The scientific community is taking bigger strides towards solving this puzzle with recent advancement in techniques like cryogenic electron microscopy (cryo-EM) and photo-affinity labelling (PAL). This review highlights the significance of the PAL technique with multiple examples of photo-probes developed from γ-secretase inhibitors and modulators. The binding of these probes into active and/or allosteric sites of the enzyme has provided crucial information on the γ-secretase complex and improved our mechanistic understanding of this protease. Combining the knowledge of function and regulation of γ-secretase will be a decisive factor in developing novel γ-secretase modulators and biological therapeutics.
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Affiliation(s)
- Pengju Nie
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA; Pharmacology program, Weill Graduate School of Medical Sciences of Cornell University, New York, NY 10021, USA
| | - Abhishek Vartak
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Yue-Ming Li
- Chemical Biology Program, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA; Pharmacology program, Weill Graduate School of Medical Sciences of Cornell University, New York, NY 10021, USA.
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13
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Trambauer J, Fukumori A, Steiner H. Pathogenic Aβ generation in familial Alzheimer’s disease: novel mechanistic insights and therapeutic implications. Curr Opin Neurobiol 2020; 61:73-81. [DOI: 10.1016/j.conb.2020.01.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 01/16/2020] [Accepted: 01/23/2020] [Indexed: 01/06/2023]
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14
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Cai T, Tomita T. Structure-activity relationship of presenilin in γ-secretase-mediated intramembrane cleavage. Semin Cell Dev Biol 2020; 105:102-109. [PMID: 32171519 DOI: 10.1016/j.semcdb.2020.02.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 02/18/2020] [Accepted: 02/19/2020] [Indexed: 01/12/2023]
Abstract
Genetic research on familial cases of Alzheimer disease have identified presenilin (PS) as an important membrane protein in the pathomechanism of this disease. PS is the catalytic subunit of γ-secretase, which is responsible for the generation of amyloid-β peptide deposited in the brains of Alzheimer disease patients. γ-Secretase is an atypical protease composed of four membrane proteins (i.e., presenilin, nicastrin, anterior pharynx defective-1 (Aph-1), and presenilin enhancer-2 (Pen-2)) and mediates intramembrane proteolysis. Numerous investigations have been conducted toward understanding the structural features of γ-secretase components as well as the cleavage mechanism of γ-secretase. In this review, we summarize our current understanding of the structure and activity relationship of the γ-secretase complex.
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Affiliation(s)
- Tetsuo Cai
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan
| | - Taisuke Tomita
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan.
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15
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Mehra R, Dehury B, Kepp KP. Cryo-temperature effects on membrane protein structure and dynamics. Phys Chem Chem Phys 2020; 22:5427-5438. [DOI: 10.1039/c9cp06723j] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Cryo-electron structures revolutionize biology, yet cooling effects are unclear. Using a simulation protocol of hot, cold, and rapidly cooled γ-secretase we identify cryo-contraction and modes relevant to Aβ production and cryo-analysis in general.
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Affiliation(s)
- Rukmankesh Mehra
- DTU Chemistry
- Technical University of Denmark
- DK-2800 Kongens Lyngby
- Denmark
| | - Budheswar Dehury
- DTU Chemistry
- Technical University of Denmark
- DK-2800 Kongens Lyngby
- Denmark
| | - Kasper P. Kepp
- DTU Chemistry
- Technical University of Denmark
- DK-2800 Kongens Lyngby
- Denmark
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16
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Cai T, Morishima K, Takagi-Niidome S, Tominaga A, Tomita T. Conformational Dynamics of Transmembrane Domain 3 of Presenilin 1 Is Associated with the Trimming Activity of γ-Secretase. J Neurosci 2019; 39:8600-8610. [PMID: 31527118 PMCID: PMC6807281 DOI: 10.1523/jneurosci.0838-19.2019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Revised: 08/16/2019] [Accepted: 08/30/2019] [Indexed: 12/26/2022] Open
Abstract
γ-Secretase is an intramembrane-cleaving protease that generates the toxic species of the amyloid-β peptide (Aβ) that is responsible for the pathology of Alzheimer disease. The catalytic subunit of γ-secretase is presenilin 1 (PS1), which is a polytopic membrane protein with a hydrophilic catalytic pore. The length of the C terminus of Aβ is proteolytically determined by its processive trimming by γ-secretase, although the precise mechanism still remains largely unknown. Here, we identified that transmembrane domain (TMD) 3 of human PS1 is involved in the formation of the intramembranous hydrophilic pore. Notably, the water accessibility of TMD3 was greatly altered by point mutations and compounds, which modify γ-secretase activity. The changes in the water accessibility of TMD3 was also correlated with Aβ42 production. Moreover, crosslinking between TMD3 and TMD7 resulted in a loss of sensitivity to a γ-secretase modulator that reduces Aβ42 production. Therefore, our findings indicate that the conformational dynamics of TMD3 is a prerequisite for regulation of the Aβ trimming activity of γ-secretase.SIGNIFICANCE STATEMENT Modulation of γ-secretase activity to reduce the level of toxic amyloid-β species is thought to be a therapeutic strategy for Alzheimer disease. However, the detailed mechanism of the regulation of amyloid-β production, as well as the structure-and-activity relationship of γ-secretase remains unclear. Here we identified that the water accessibility around transmembrane domain 3 in presenilin 1 was increased along with a reduction in toxic amyloid-β production. Our findings demonstrate how the structure of presenilin 1 dynamically changes during amyloid-β production, and provides insights toward the development of treatments against Alzheimer disease.
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Affiliation(s)
- Tetsuo Cai
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, and
| | - Kanan Morishima
- Laboratory of Neuropathology and Neuroscience, Faculty of Pharmaceutical Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shizuka Takagi-Niidome
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, and
| | - Aya Tominaga
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, and
| | - Taisuke Tomita
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, and
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17
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Ahn JE, Carrieri C, Dela Cruz F, Fullerton T, Hajos-Korcsok E, He P, Kantaridis C, Leurent C, Liu R, Mancuso J, Mendes da Costa L, Qiu R. Pharmacokinetic and Pharmacodynamic Effects of a γ-Secretase Modulator, PF-06648671, on CSF Amyloid-β Peptides in Randomized Phase I Studies. Clin Pharmacol Ther 2019; 107:211-220. [PMID: 31314925 PMCID: PMC6977340 DOI: 10.1002/cpt.1570] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Accepted: 06/08/2019] [Indexed: 01/04/2023]
Abstract
γ‐Secretase modulators (GSMs) represent a promising therapy for Alzheimer's disease by reducing pathogenic amyloid‐β (Aβ) peptide production. Three phase I studies (NCT02316756, NCT02407353, and NCT02440100) investigated the safety/tolerability, pharmacokinetics (PKs), and pharmacodynamics (PDs) of the oral GSM, PF‐06648671. A PK/PD indirect‐response model was developed (using biomarker data) to simultaneously characterize differential effects of PF‐06648671 on multiple Aβ species in cerebrospinal fluid (CSF). Healthy subjects (n = 120) received single doses or multiple‐ascending doses of PF‐06648671/placebo for 14 days. No serious adverse events occurred; severe adverse eventswere deemed not drug related. PF‐06648671 decreased Aβ42 and Aβ40 concentrations in CSF, with greater effects on Aβ42, and increased Aβ37 and Aβ38 levels, particularly Aβ37. No significant change in total Aβ was observed. The PK/PD model well described the tendency of observed CSF Aβ data and the steady‐state effects of PF‐06648671, supporting its use for predicting central Aβ effects and optimal dose selection for GSMs in future trials.
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Affiliation(s)
| | | | | | | | - Eva Hajos-Korcsok
- Pfizer Inc, Cambridge, Massachusetts, USA.,Sunovion Pharmaceuticals, Marlborough, Massachusetts, USA
| | - Ping He
- Pfizer Inc, Cambridge, Massachusetts, USA.,Biogen Inc, Cambridge, Massachusetts, USA
| | | | - Claire Leurent
- Pfizer Inc, Cambridge, Massachusetts, USA.,Samsung Ventures America, Boston, Massachusetts, USA
| | - Richann Liu
- Pfizer Inc, Cambridge, Massachusetts, USA.,ICON, Boston, Massachusetts, USA
| | | | | | - Ruolun Qiu
- Pfizer Inc, Cambridge, Massachusetts, USA
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18
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Frere S, Slutsky I. Alzheimer's Disease: From Firing Instability to Homeostasis Network Collapse. Neuron 2019; 97:32-58. [PMID: 29301104 DOI: 10.1016/j.neuron.2017.11.028] [Citation(s) in RCA: 157] [Impact Index Per Article: 31.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2017] [Revised: 11/14/2017] [Accepted: 11/17/2017] [Indexed: 12/22/2022]
Abstract
Alzheimer's disease (AD) starts from pure cognitive impairments and gradually progresses into degeneration of specific brain circuits. Although numerous factors initiating AD have been extensively studied, the common principles underlying the transition from cognitive deficits to neuronal loss remain unknown. Here we describe an evolutionarily conserved, integrated homeostatic network (IHN) that enables functional stability of central neural circuits and safeguards from neurodegeneration. We identify the critical modules comprising the IHN and propose a central role of neural firing in controlling the complex homeostatic network at different spatial scales. We hypothesize that firing instability and impaired synaptic plasticity at early AD stages trigger a vicious cycle, leading to dysregulation of the whole IHN. According to this hypothesis, the IHN collapse represents the major driving force of the transition from early memory impairments to neurodegeneration. Understanding the core elements of homeostatic control machinery, the reciprocal connections between distinct IHN modules, and the role of firing homeostasis in this hierarchy has important implications for physiology and should offer novel conceptual approaches for AD and other neurodegenerative disorders.
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Affiliation(s)
- Samuel Frere
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, 69978 Tel Aviv, Israel
| | - Inna Slutsky
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, 69978 Tel Aviv, Israel; Sagol School of Neuroscience, Tel Aviv University, 69978 Tel Aviv, Israel.
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19
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γ-Secretase and its modulators: Twenty years and beyond. Neurosci Lett 2019; 701:162-169. [PMID: 30763650 DOI: 10.1016/j.neulet.2019.02.011] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Accepted: 02/07/2019] [Indexed: 01/03/2023]
Abstract
Twenty years ago, Wolfe, Xia, and Selkoe identified two aspartate residues in Alzheimer's presenilin protein that constitute the active site of the γ-secretase complex. Mutations in the genes encoding amyloid precursor protein (APP) or presenilin (PS) cause early onset familial Alzheimer's disease (AD), and sequential cleavages of the APP by β-secretase and γ-secretase/presenilin generate amyloid β protein (Aβ), the major component of pathological hallmark, neuritic plaques, in brains of AD patients. Therapeutic strategies centered on targeting γ-secretase/presenilin to reduce amyloid were implemented and led to several high profile clinical trials. This review article focuses on the studies of γ-secretase and its inhibitors/modulators since the discovery of presenilin as the γ-secretase. While a lack of complete understanding of presenilin biology renders failure of clinical trials, the lessons learned from some γ-secretase modulators, while premature for human testing, provide new directions to develop potential therapeutics. Imbalanced Aβ homeostasis is an upstream event of neurodegenerative processes. Exploration of γ-secretase modulators for their roles in these processes is highly significant, e.g., decreasing neuroinflammation and levels of phosphorylated tau, the component of the other AD pathological hallmark, neurofibrillary tangles. Agents with excellent human pharmacology hold great promise in suppressing neurodegeneration in pre-symptomatic or early stage AD patients.
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20
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Kidana K, Tatebe T, Ito K, Hara N, Kakita A, Saito T, Takatori S, Ouchi Y, Ikeuchi T, Makino M, Saido TC, Akishita M, Iwatsubo T, Hori Y, Tomita T. Loss of kallikrein-related peptidase 7 exacerbates amyloid pathology in Alzheimer's disease model mice. EMBO Mol Med 2019; 10:emmm.201708184. [PMID: 29311134 PMCID: PMC5840542 DOI: 10.15252/emmm.201708184] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Deposition of amyloid‐β (Aβ) as senile plaques is one of the pathological hallmarks in the brains of Alzheimer's disease (AD) patients. In addition, glial activation has been found in AD brains, although the precise pathological role of astrocytes remains unclear. Here, we identified kallikrein‐related peptidase 7 (KLK7) as an astrocyte‐derived Aβ degrading enzyme. Expression of KLK7 mRNA was significantly decreased in the brains of AD patients. Ablation of Klk7 exacerbated the thioflavin S‐positive Aβ pathology in AD model mice. The expression of Klk7 was upregulated by Aβ treatment in the primary astrocyte, suggesting that Klk7 is homeostatically modulated by Aβ‐induced responses. Finally, we found that the Food and Drug Administration‐approved anti‐dementia drug memantine can increase the expression of Klk7 and Aβ degradation activity specifically in the astrocytes. These data suggest that KLK7 is an important enzyme in the degradation and clearance of deposited Aβ species by astrocytes involved in the pathogenesis of AD.
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Affiliation(s)
- Kiwami Kidana
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan.,Department of Geriatric Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.,Department of Internal Medicine, Komeikai Hospital, Tokyo, Japan
| | - Takuya Tatebe
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Kaori Ito
- Venture Science Laboratories, R&D Division, Daiichi-Sankyo Co. Ltd., Tokyo, Japan
| | - Norikazu Hara
- Department of Molecular Genetics, Brain Research Institute, Niigata University, Niigata, Japan
| | - Akiyoshi Kakita
- Department of Pathology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Takashi Saito
- Laboratory for Proteolytic Neuroscience, RIKEN Brain Science Institute, Saitama, Japan
| | - Sho Takatori
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Yasuyoshi Ouchi
- Department of Geriatric Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.,Federation of National Public Service Personnel Mutual Aid Associations, Toranomon Hospital, Tokyo, Japan
| | - Takeshi Ikeuchi
- Department of Molecular Genetics, Brain Research Institute, Niigata University, Niigata, Japan
| | - Mitsuhiro Makino
- Venture Science Laboratories, R&D Division, Daiichi-Sankyo Co. Ltd., Tokyo, Japan
| | - Takaomi C Saido
- Laboratory for Proteolytic Neuroscience, RIKEN Brain Science Institute, Saitama, Japan
| | - Masahiro Akishita
- Department of Geriatric Medicine, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Takeshi Iwatsubo
- Department of Neuropathology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Yukiko Hori
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Taisuke Tomita
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
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21
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Imai S, Cai T, Yoshida C, Tomita T, Futai E. Specific mutations in presenilin 1 cause conformational changes in γ-secretase to modulate amyloid β trimming. J Biochem 2018; 165:37-46. [DOI: 10.1093/jb/mvy081] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Accepted: 10/04/2018] [Indexed: 01/08/2023] Open
Affiliation(s)
- So Imai
- Department of Molecular and Cell Biology, Graduate School of Agricultural Science, Tohoku University, 468-1 Aramakiazaaoba, Aobaku, Sendai, Miyagi, Japan
| | - Tetsuo Cai
- Department of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
| | - Chika Yoshida
- Department of Molecular and Cell Biology, Graduate School of Agricultural Science, Tohoku University, 468-1 Aramakiazaaoba, Aobaku, Sendai, Miyagi, Japan
| | - Taisuke Tomita
- Department of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan
| | - Eugene Futai
- Department of Molecular and Cell Biology, Graduate School of Agricultural Science, Tohoku University, 468-1 Aramakiazaaoba, Aobaku, Sendai, Miyagi, Japan
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22
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Kanatsu K, Hori Y, Ebinuma I, Chiu YW, Tomita T. Retrograde transport of γ-secretase from endosomes to the trans-Golgi network regulates Aβ42 production. J Neurochem 2018; 147:110-123. [PMID: 29851073 DOI: 10.1111/jnc.14477] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2017] [Revised: 03/08/2018] [Accepted: 05/23/2018] [Indexed: 01/01/2023]
Abstract
The aberrant metabolism of amyloid-β protein (Aβ) in the human brain has been implicated in the etiology of Alzheimer disease (AD). γ-Secretase is the enzyme that generates various forms of Aβ, such as Aβ40 and Aβ42, the latter being an aggregation-prone toxic peptide that is involved in the pathogenesis of AD. Recently, we found that clathrin-mediated endocytosis of γ-secretase affects the production and deposition of Aβ42 in vivo, suggesting that the membrane trafficking of γ-secretase affects its enzymatic activity. However, the detailed intracellular trafficking pathway of γ-secretase and its contribution to Aβ42 generation remain unclear. Here, we show that Retro-2, which inhibits the retrograde transport, elevated the Aβ42-generating activity both in cultured cells and mice brain. However, the result of in vitro γ-secretase assay using a recombinant substrate suggested that Retro-2 did not elevate the intrinsic Aβ42-production activity of γ-secretase. Immunocytochemistry and cell-surface biotinylation experiments revealed that γ-secretase is recycled via the endosome-to-trans-Golgi network transport. In addition, γ-secretase is retrogradely transported by syntaxin 5/6, known as targets of Retro-2, independent pathway. Conversely, TPT-260, which enhances the trafficking function of retromers, lowered Aβ42 levels and the Aβ42/(Aβ40 + Aβ42) ratio in secreted Aβ from cultured cells. Our results strongly suggest that the endosome-to-trans-Golgi network trafficking of γ-secretase regulates its Aβ42 production activity. Modulation of this trafficking pathway might be a potential target for the development of Aβ42-lowering AD therapeutics. OPEN PRACTICES Open Science: This manuscript was awarded with the Open Materials Badge. For more information see: https://cos.io/our-services/open-science-badges/.
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Affiliation(s)
- Kunihiko Kanatsu
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Yukiko Hori
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Ihori Ebinuma
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Yung Wen Chiu
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Taisuke Tomita
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
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23
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Kumar D, Ganeshpurkar A, Kumar D, Modi G, Gupta SK, Singh SK. Secretase inhibitors for the treatment of Alzheimer's disease: Long road ahead. Eur J Med Chem 2018; 148:436-452. [DOI: 10.1016/j.ejmech.2018.02.035] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 01/30/2018] [Accepted: 02/10/2018] [Indexed: 10/18/2022]
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24
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Activation of γ-Secretase Trimming Activity by Topological Changes of Transmembrane Domain 1 of Presenilin 1. J Neurosci 2017; 37:12272-12280. [PMID: 29118109 DOI: 10.1523/jneurosci.1628-17.2017] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2017] [Revised: 10/10/2017] [Accepted: 11/03/2017] [Indexed: 11/21/2022] Open
Abstract
γ-Secretase is an intramembrane cleaving protease that is responsible for the generation of amyloid-β peptides, which are linked to the pathogenesis of Alzheimer disease. Recently, γ-secretase modulators (GSMs) have been shown to specifically decrease production of the aggregation-prone and toxic longer Aβ species, and concomitantly increase the levels of shorter Aβ. We previously found that phenylimidazole-type GSMs bind to presenilin 1 (PS1), the catalytic subunit of the γ-secretase, and allosterically modulate γ-secretase activity. However, the precise conformational alterations in PS1 remained unclear. Here we mapped the amino acid residues in PS1 that is crucial for the binding and pharmacological actions of E2012, a phenylimidazole-type GSM, using photoaffinity labeling and the substituted cysteine accessibility method. We also demonstrated that a piston-like vertical motion of transmembrane domain (TMD) 1 occurs during modulation of Aβ production. Taking these results together, we propose a model for the molecular mechanism of phenylimidazole-type GSMs, in which the trimming activity of γ-secretase is modulated by the position of the TMD1 of PS1 in the lipid bilayer.SIGNIFICANCE STATEMENT Reduction of the toxic longer amyloid-β peptide is one of the therapeutic approaches for Alzheimer disease. A subset of small compounds called γ-secretase modulators specifically decreases the longer amyloid-β production, although its mechanistic action remains unclear. Here we found that the modulator compound E2012 targets to the hydrophilic loop 1 of presenilin 1, which is a catalytic subunit of the γ-secretase. Moreover, E2012 triggers the piston movement of the transmembrane domain 1 of presenilin 1, which impacts on the γ-secretase activity. These results illuminate how γ-secretase modulators allosterically affect the proteolytic activity, and highlight the importance of the structural dynamics of presenilin 1 in the complexed process of the intramembrane cleavage.
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25
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Robertson AS, Iben LG, Wei C, Meredith JE, Drexler DM, Banks M, Vite GD, Olson RE, Thompson LA, Albright CF, Ahlijanian MK, Toyn JH. Synergistic inhibition of Aβ production by combinations of γ-secretase modulators. Eur J Pharmacol 2017; 812:104-112. [DOI: 10.1016/j.ejphar.2017.07.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 07/03/2017] [Accepted: 07/05/2017] [Indexed: 01/23/2023]
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26
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Dynamic Nature of presenilin1/γ-Secretase: Implication for Alzheimer's Disease Pathogenesis. Mol Neurobiol 2017; 55:2275-2284. [PMID: 28332150 DOI: 10.1007/s12035-017-0487-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 03/12/2017] [Indexed: 12/27/2022]
Abstract
Presenilin 1 (PS1) is a catalytic component of the γ-secretase complex, responsible for the intramembraneous cleavage of more than 90 type I transmembrane proteins, including Alzheimer's disease (AD)-related amyloid precursor protein (APP). The γ-secretase-mediated cleavage of the APP C-terminal membrane stub leads to the production of various amyloid β (Aβ) species. The assembly of Aβ into neurotoxic oligomers, which causes synaptic dysfunction and neurodegeneration, is influenced by the relative ratio of the longer (Aβ42/43) to shorter Aβ (Aβ40) peptides. The ratio of Aβ42 to Aβ40 depends on the conformation and activity of the PS1/γ-secretase enzymatic complex. The latter exists in a dynamic equilibrium of the so called "closed" and "open" conformational states, as determined by the Förster resonance energy transfer (FRET)-based PS1 conformation assay. Here we review several factors that can allosterically influence conformational status of the enzyme, and hence the production of Aβ peptides. These include genetic variations in PS1, APP and other γ-secretase components, environmental stressors implicated in AD pathogenesis and pharmacological agents. Since "closed" PS1 conformation is the common outcome of many AD-related insults, the novel assays monitoring PS1 conformation in live/intact cells in vivo and in vitro might be utilized for diagnostic purposes and for validation of the potential therapeutic approaches.
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27
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Zoltowska KM, Maesako M, Lushnikova I, Takeda S, Keller LJ, Skibo G, Hyman BT, Berezovska O. Dynamic presenilin 1 and synaptotagmin 1 interaction modulates exocytosis and amyloid β production. Mol Neurodegener 2017; 12:15. [PMID: 28193235 PMCID: PMC5307796 DOI: 10.1186/s13024-017-0159-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2016] [Accepted: 02/09/2017] [Indexed: 01/09/2023] Open
Abstract
Background Alzheimer’s disease (AD)-linked protein, presenilin 1 (PS1), is present at the synapse, and the knock-out of presenilin in mice leads to synaptic dysfunction. On the other hand, synaptic activity was shown to influence PS1-dependent generation of distinct amyloid β (Aβ) species. However, the precise nature of these regulations remains unclear. The current study reveals novel role of PS1 at the synapse, and deciphers how PS1 and synaptic vesicle-associated protein, synaptotagmin 1 (Syt1) modulate each other functions in neurons via direct activity-triggered interaction. Additionally, the therapeutic potential of fostering PS1-Syt1 binding is investigated as a synapse-specific strategy for AD prevention. Methods PS1-based cell-permeable peptide targeting PS1-Syt1 binding site was designed to inhibit PS1-Syt1 interaction in neurons. PS1 conformation, synaptic vesicle exocytosis and trafficking were assayed by fluorescence lifetime imaging microscopy (FLIM), glutamate release/synaptopHluorin assay, and fluorescence recovery after photobleaching, respectively. Syt1 level and interaction with PS1 in control and sporadic AD brains were determined by immunohistochemistry and FLIM. AAV-mediated delivery of Syt1 into mouse hippocampi was used to investigate the therapeutic potential of strengthening PS1-Syt1 binding in vivo. Statistical significance was determined using two-tailed unpaired Student’s t-test, Mann-Whitney’s U-test or two-way ANOVA followed by a Bonferroni’s post-test. Results We demonstrate that targeted inhibition of the PS1-Syt1 binding in neurons, without changing the proteins’ expression level, triggers “pathogenic” conformational shift of PS1, and consequent increase in the Aβ42/40 ratio. Moreover, our data indicate that PS1, by binding directly to Syt1, regulates synaptic vesicle trafficking and facilitates exocytosis and neurotransmitter release. Analysis of human brain tissue revealed that not only Syt1 levels but also interactions between remaining Syt1 and PS1 are diminished in sporadic AD. On the other hand, overexpression of Syt1 in mouse hippocampi was found to potentiate PS1-Syt1 binding and promote “protective” PS1 conformation. Conclusions The study reports novel functions of PS1 and Syt1 at the synapse, and demonstrates the importance of PS1-Syt1 binding for exocytosis and safeguarding PS1 conformation. It suggests that reduction in the Syt1 level and PS1-Syt1 interactions in AD brain may present molecular underpinning of the pathogenic PS1 conformation, increased Aβ42/40 ratio, and impaired exocytosis. Electronic supplementary material The online version of this article (doi:10.1186/s13024-017-0159-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Katarzyna Marta Zoltowska
- Department of Neurology, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, 114 16th Street, Rm. 2006, 02129, Charlestown, MA, USA
| | - Masato Maesako
- Department of Neurology, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, 114 16th Street, Rm. 2006, 02129, Charlestown, MA, USA
| | - Iryna Lushnikova
- Department of Cytology, Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, 4 Bogomoletz Street, 01024, Kyiv, Ukraine
| | - Shuko Takeda
- Department of Neurology, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, 114 16th Street, Rm. 2006, 02129, Charlestown, MA, USA
| | - Laura J Keller
- Department of Neurology, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, 114 16th Street, Rm. 2006, 02129, Charlestown, MA, USA
| | - Galina Skibo
- Department of Cytology, Bogomoletz Institute of Physiology, National Academy of Sciences of Ukraine, 4 Bogomoletz Street, 01024, Kyiv, Ukraine
| | - Bradley T Hyman
- Department of Neurology, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, 114 16th Street, Rm. 2006, 02129, Charlestown, MA, USA
| | - Oksana Berezovska
- Department of Neurology, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, 114 16th Street, Rm. 2006, 02129, Charlestown, MA, USA.
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28
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Maesako M, Horlacher J, Zoltowska KM, Kastanenka KV, Kara E, Svirsky S, Keller LJ, Li X, Hyman BT, Bacskai BJ, Berezovska O. Pathogenic PS1 phosphorylation at Ser367. eLife 2017; 6. [PMID: 28132667 PMCID: PMC5279945 DOI: 10.7554/elife.19720] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2016] [Accepted: 01/05/2017] [Indexed: 11/13/2022] Open
Abstract
The high levels of serine (S) and threonine (T) residues within the Presenilin 1 (PS1) N-terminus and in the large hydrophilic loop region suggest that the enzymatic function of PS1/γ-secretase can be modulated by its ‘phosphorylated’ and ‘dephosphorylated’ states. However, the functional outcome of PS1 phosphorylation and its significance for Alzheimer’s disease (AD) pathogenesis is poorly understood. Here, comprehensive analysis using FRET-based imaging reveals that activity-driven and Protein Kinase A-mediated PS1 phosphorylation at three domains (domain 1: T74, domain 2: S310 and S313, domain 3: S365, S366, and S367), with S367 being critical, is responsible for the PS1 pathogenic ‘closed’ conformation, and resulting increase in the Aβ42/40 ratio. Moreover, we have established novel imaging assays for monitoring PS1 conformation in vivo, and report that PS1 phosphorylation induces the pathogenic conformational shift in the living mouse brain. These phosphorylation sites represent potential new targets for AD treatment. DOI:http://dx.doi.org/10.7554/eLife.19720.001 Alzheimer’s disease is a widely recognised disorder caused by the progressive deterioration and death of brain cells. A key feature of the disease is the formation of structures called plaques in the brain. Plaques occur when many copies of a molecule known as amyloid beta stick together outside of the brain cells. Healthy brains also produce amyloid beta but it is in a different form, which cannot form plaques. One in twenty people with Alzheimer’s disease have a family history of the disease. Of these, many are linked to changes in a gene that produces a protein called Presenilin 1 (or PS1 for short). Cells need PS1 to make amyloid beta and the altered versions of PS1 produce the type of amyloid beta that causes Alzheimer’s disease. Yet, in cases that do not run in families, the gene for PS1 is unchanged but the PS1 protein still produces the form of amyloid beta that is linked to Alzheimer’s disease. Maesako, Horlacher et al. wanted to find out how seemingly healthy PS1 proteins can be made to produce plaque-forming amyloid betas. Studies of PS1 from mice revealed that small chemical modifications, called phosphate groups, could be attached to PS1 in a process called phosphorylation. Modified PS1 proteins produce harmful amyloid betas and removing the modifications was enough to make PS1 behave normally again. Maesako, Horlacher et al. found three points in the PS1 protein where phosphorylation could change the behaviour of the protein, the most important one is a site called Ser367. Further investigation showed that an enzyme called Protein Kinase A (PKA) phosphorylates PS1; this enzyme is also able to attach phosphate groups to many different proteins. Maesako, Horlacher et al. went on to show that PS1 is phosphorylated in samples from people with Alzheimer’s disease, suggesting that this is a plausible cause for some cases of the disease. Finding a way to prevent phosphorylation or remove phosphate groups from PS1 could be the first step towards treating these cases of Alzheimer’s disease. DOI:http://dx.doi.org/10.7554/eLife.19720.002
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Affiliation(s)
- Masato Maesako
- Alzheimer's Disease Research Laboratory, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, United States
| | - Jana Horlacher
- Alzheimer's Disease Research Laboratory, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, United States.,Department of Neurology, University of Ulm, Ulm, Germany
| | - Katarzyna M Zoltowska
- Alzheimer's Disease Research Laboratory, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, United States
| | - Ksenia V Kastanenka
- Alzheimer's Disease Research Laboratory, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, United States
| | - Eleanna Kara
- Alzheimer's Disease Research Laboratory, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, United States
| | - Sarah Svirsky
- Alzheimer's Disease Research Laboratory, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, United States
| | - Laura J Keller
- Alzheimer's Disease Research Laboratory, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, United States
| | - Xuejing Li
- Alzheimer's Disease Research Laboratory, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, United States
| | - Bradley T Hyman
- Alzheimer's Disease Research Laboratory, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, United States
| | - Brian J Bacskai
- Alzheimer's Disease Research Laboratory, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, United States
| | - Oksana Berezovska
- Alzheimer's Disease Research Laboratory, MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Charlestown, United States
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Aberrant proteolytic processing and therapeutic strategies in Alzheimer disease. Adv Biol Regul 2017; 64:33-38. [PMID: 28082052 DOI: 10.1016/j.jbior.2017.01.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 12/24/2016] [Accepted: 01/04/2017] [Indexed: 01/18/2023]
Abstract
Amyloid-β peptide (Aβ) and tau are major components of senile plaques and neurofibrillary tangles, respectively, deposited in the brains of Alzheimer disease (AD) patients. Aβ is derived from amyloid-β precursor protein that is sequentially cleaved by two aspartate proteases, β- and γ-secretases. Secreted Aβ is then catabolized by several proteases. Several lines of evidence suggest that accumulation of Aβ by increased production or decreased degradation induces the tau-mediated neuronal toxicity and symptomatic manifestations of AD. Thus, the dynamics of cerebral Aβ, called as "Aβ economy", would be the mechanistic basis of AD pathogenesis. Partial loss of γ-secretase activity leads to the increased generation of toxic Aβ isoforms, indicating that activation of γ-secretase would provide a beneficial effect for AD. After extensive discovery and development efforts, BACE1, which is a β-secretase enzyme, has emerged as a prime drug target for lowering brain Aβ levels. Recent studies revealed the decreased clearance of Aβ in sporadic AD patients, suggesting the importance of the catabolic mechanism in the pathogenesis of AD. I will discuss with these proteolytic mechanisms involved in the regulation of Aβ economy, and development of effective treatment and diagnostics for AD.
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Probing the Structure and Function Relationships of Presenilin by Substituted-Cysteine Accessibility Method. Methods Enzymol 2017; 584:185-205. [DOI: 10.1016/bs.mie.2016.10.033] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
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31
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γ-Secretase Modulators as Aβ42-Lowering Pharmacological Agents to Treat Alzheimer’s Disease. TOPICS IN MEDICINAL CHEMISTRY 2017. [DOI: 10.1007/7355_2016_19] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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Trambauer J, Fukumori A, Kretner B, Steiner H. Analyzing Amyloid-β Peptide Modulation Profiles and Binding Sites of γ-Secretase Modulators. Methods Enzymol 2017; 584:157-183. [DOI: 10.1016/bs.mie.2016.10.013] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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33
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Dormán G, Nakamura H, Pulsipher A, Prestwich GD. The Life of Pi Star: Exploring the Exciting and Forbidden Worlds of the Benzophenone Photophore. Chem Rev 2016; 116:15284-15398. [PMID: 27983805 DOI: 10.1021/acs.chemrev.6b00342] [Citation(s) in RCA: 133] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The widespread applications of benzophenone (BP) photochemistry in biological chemistry, bioorganic chemistry, and material science have been prominent in both academic and industrial research. BP photophores have unique photochemical properties: upon n-π* excitation at 365 nm, a biradicaloid triplet state is formed reversibly, which can abstract a hydrogen atom from accessible C-H bonds; the radicals subsequently recombine, creating a stable covalent C-C bond. This light-directed covalent attachment process is exploited in many different ways: (i) binding/contact site mapping of ligand (or protein)-protein interactions; (ii) identification of molecular targets and interactome mapping; (iii) proteome profiling; (iv) bioconjugation and site-directed modification of biopolymers; (v) surface grafting and immobilization. BP photochemistry also has many practical advantages, including low reactivity toward water, stability in ambient light, and the convenient excitation at 365 nm. In addition, several BP-containing building blocks and reagents are commercially available. In this review, we explore the "forbidden" (transitions) and excitation-activated world of photoinduced covalent attachment of BP photophores by touring a colorful palette of recent examples. In this exploration, we will see the pros and cons of using BP photophores, and we hope that both novice and expert photolabelers will enjoy and be inspired by the breadth and depth of possibilities.
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Affiliation(s)
- György Dormán
- Targetex llc , Dunakeszi H-2120, Hungary.,Faculty of Pharmacy, University of Szeged , Szeged H-6720, Hungary
| | - Hiroyuki Nakamura
- Laboratory for Chemistry and Life Science, Institute of Innovative Research, Tokyo Institute of Technology , Yokohama 226-8503, Japan
| | - Abigail Pulsipher
- GlycoMira Therapeutics, Inc. , Salt Lake City, Utah 84108, United States.,Division of Head and Neck Surgery, Rhinology - Sinus and Skull Base Surgery, Department of Surgery, University of Utah School of Medicine , Salt Lake City, Utah 84108, United States
| | - Glenn D Prestwich
- Division of Head and Neck Surgery, Rhinology - Sinus and Skull Base Surgery, Department of Surgery, University of Utah School of Medicine , Salt Lake City, Utah 84108, United States
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34
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Schröder B, Saftig P. Intramembrane proteolysis within lysosomes. Ageing Res Rev 2016; 32:51-64. [PMID: 27143694 DOI: 10.1016/j.arr.2016.04.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Revised: 04/01/2016] [Accepted: 04/26/2016] [Indexed: 11/26/2022]
Abstract
Regulated intramembrane proteolysis is of pivotal importance in a diverse set of developmental and physiological processes. Altered intramembrane substrate turnover may be associated with neurodegeneration, cancer and impaired immune function. In this review we will focus on the intramembrane proteases which have been localized in the lysosomal membrane. Members of the γ-secretase complex and γ-secretase activity are found in the lysosomal membrane and are discussed to contribute to intracellular amyloid β production. Mutant or deficient γ-secretase may cause disturbed lysosomal function. The signal peptide peptidase-like (SPPL) protease 2a is a lysosomal membrane component and cleaves CD74, the invariant chain of the MHC II complex, as well as FasL, TNF, ITM2B and TMEM106, type II transmembrane proteins involved in the regulation of immunity and neurodegeneration. Therefore, it can be concluded, that not only proteolysis within the lysosomal lumen but also within lysosomal membranes regulates important cellular functions and contributes essentially to proteostasis of membrane proteins what may become increasingly compromised in the aged individual.
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Affiliation(s)
- Rodrigo Aguayo-Ortiz
- Departamento de Fisicoquímica; Universidad Nacional Autónoma de México; Ciudad de México 04510 México
| | - Laura Dominguez
- Departamento de Fisicoquímica; Universidad Nacional Autónoma de México; Ciudad de México 04510 México
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36
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Ryan NS, Nicholas JM, Weston PSJ, Liang Y, Lashley T, Guerreiro R, Adamson G, Kenny J, Beck J, Chavez-Gutierrez L, de Strooper B, Revesz T, Holton J, Mead S, Rossor MN, Fox NC. Clinical phenotype and genetic associations in autosomal dominant familial Alzheimer's disease: a case series. Lancet Neurol 2016; 15:1326-1335. [PMID: 27777022 DOI: 10.1016/s1474-4422(16)30193-4] [Citation(s) in RCA: 148] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 07/15/2016] [Accepted: 07/25/2016] [Indexed: 01/09/2023]
Abstract
BACKGROUND The causes of phenotypic heterogeneity in familial Alzheimer's disease with autosomal dominant inheritance are not well understood. We aimed to characterise clinical phenotypes and genetic associations with APP and PSEN1 mutations in symptomatic autosomal dominant familial Alzheimer's disease (ADAD). METHODS We retrospectively analysed genotypic and phenotypic data (age at symptom onset, initial cognitive or behavioural symptoms, and presence of myoclonus, seizures, pyramidal signs, extrapyramidal signs, and cerebellar signs) from all individuals with ADAD due to APP or PSEN1 mutations seen at the Dementia Research Centre in London, UK. We examined the frequency of presenting symptoms and additional neurological features, investigated associations with age at symptom onset, APOE genotype, and mutation position, and explored phenotypic differences between APP and PSEN1 mutation carriers. The proportion of individuals presenting with various symptoms was analysed with descriptive statistics, stratified by mutation type. FINDINGS Between July 1, 1987, and Oct 31, 2015, age at onset was recorded for 213 patients (168 with PSEN1 mutations and 45 with APP mutations), with detailed history and neurological examination findings available for 121 (85 with PSEN1 mutations and 36 with APP mutations). We identified 38 different PSEN1 mutations (four novel) and six APP mutations (one novel). Age at onset differed by mutation, with a younger onset for individuals with PSEN1 mutations than for those with APP mutations (mean age 43·6 years [SD 7·2] vs 50·4 years [SD 5·2], respectively, p<0·0001); within the PSEN1 group, 72% of age at onset variance was explained by the specific mutation. A cluster of five mutations with particularly early onset (mean age at onset <40 years) involving PSEN1's first hydrophilic loop suggests critical functional importance of this region. 71 (84%) individuals with PSEN1 mutations and 35 (97%) with APP mutations presented with amnestic symptoms, making atypical cognitive presentations significantly more common in PSEN1 mutation carriers (n=14; p=0·037). Myoclonus and seizures were the most common additional neurological features; individuals with myoclonus (40 [47%] with PSEN1 mutations and 12 [33%] with APP mutations) were significantly more likely to develop seizures (p=0·001 for PSEN1; p=0·036 for APP), which affected around a quarter of the patients in each group (20 [24%] and nine [25%], respectively). A number of patients with PSEN1 mutations had pyramidal (21 [25%]), extrapyramidal (12 [14%]), or cerebellar (three [4%]) signs. INTERPRETATION ADAD phenotypes are heterogeneous, with both age at onset and clinical features being influenced by mutation position as well as causative gene. This highlights the importance of considering genetic testing in young patients with dementia and additional neurological features in order to appropriately diagnose and treat their symptoms, and of examining different mutation types separately in future research. FUNDING Medical Research Council and National Institute for Health Research.
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Affiliation(s)
- Natalie S Ryan
- Dementia Research Centre, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, UK.
| | - Jennifer M Nicholas
- Dementia Research Centre, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, UK; Medical Statistics Unit, Department of Epidemiology and Population Health, London School of Hygiene & Tropical Medicine, London, UK
| | - Philip S J Weston
- Dementia Research Centre, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, UK
| | - Yuying Liang
- Dementia Research Centre, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, UK
| | - Tammaryn Lashley
- Queen Square Brain Bank, University College London Institute of Neurology, London, UK
| | - Rita Guerreiro
- Department of Molecular Neuroscience, University College London Institute of Neurology, London, UK; Department of Medical Sciences, Institute of Biomedicine iBiMED, University of Aveiro, Aveiro Portugal
| | - Gary Adamson
- Medical Research Council Prion Unit, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, UK
| | - Janna Kenny
- Medical Research Council Prion Unit, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, UK
| | - Jon Beck
- Medical Research Council Prion Unit, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, UK
| | - Lucia Chavez-Gutierrez
- VIB Center for the Biology of Disease, Leuven, Belgium; Center for Human Genetics and Leuven Institute for Neurodegenerative Diseases, University of Leuven, Leuven, Belgium
| | - Bart de Strooper
- Department of Molecular Neuroscience, University College London Institute of Neurology, London, UK; VIB Center for the Biology of Disease, Leuven, Belgium; Center for Human Genetics and Leuven Institute for Neurodegenerative Diseases, University of Leuven, Leuven, Belgium
| | - Tamas Revesz
- Queen Square Brain Bank, University College London Institute of Neurology, London, UK
| | - Janice Holton
- Queen Square Brain Bank, University College London Institute of Neurology, London, UK
| | - Simon Mead
- Medical Research Council Prion Unit, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, UK
| | - Martin N Rossor
- Dementia Research Centre, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, UK
| | - Nick C Fox
- Dementia Research Centre, Department of Neurodegenerative Disease, University College London Institute of Neurology, London, UK
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Beyond Chemoselectivity: Catalytic Site-Selective Aldolization of Diketones and Exploitation for Enantioselective Alzheimer's Drug Candidate Synthesis. Chemistry 2016; 22:14342-8. [DOI: 10.1002/chem.201602900] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2016] [Indexed: 11/07/2022]
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Crump CJ, Murrey HE, Ballard TE, am Ende CW, Wu X, Gertsik N, Johnson DS, Li YM. Development of Sulfonamide Photoaffinity Inhibitors for Probing Cellular γ-Secretase. ACS Chem Neurosci 2016; 7:1166-73. [PMID: 27253220 DOI: 10.1021/acschemneuro.6b00127] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
γ-Secretase is a multiprotein complex that catalyzes intramembrane proteolysis associated with Alzheimer's disease and cancer. Here, we have developed potent sulfonamide clickable photoaffinity probes that target γ-secretase in vitro and in cells by incorporating various photoreactive groups and walking the clickable alkyne handle to different positions around the molecule. We found that benzophenone is preferred over diazirine as a photoreactive group within the sulfonamide scaffold for labeling γ-secretase. Intriguingly, the placement of the alkyne at different positions has little effect on probe potency but has a significant impact on the efficiency of labeling of γ-secretase. Moreover, the optimized clickable photoprobe, 163-BP3, was utilized as a cellular probe to effectively assess the target engagement of inhibitors with γ-secretase in primary neuronal cells. In addition, biotinylated 163-BP3 probes were developed and used to capture the native γ-secretase complex in the 3-[(3-cholamidopropyl)dimethylammonio]-2-hydroxy-1-propanesulfonate (CHAPSO) solubilized state. Taken together, these next generation clickable and biotinylated sulfonamide probes offer new tools to study γ-secretase in biochemical and cellular systems. Finally, the data provide insights into structural features of the sulfonamide inhibitor binding site in relation to the active site and into the design of clickable photoaffinity probes.
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Affiliation(s)
- Christina J. Crump
- Chemical
Biology Program, Memorial Sloan Kettering Cancer Center, 1275 York
Avenue, New York, New York 10065, United States
| | - Heather E. Murrey
- Pfizer Worldwide Research and Development, Worldwide Medicinal Chemistry, Cambridge, Massachusetts 02139, United States
| | - T. Eric Ballard
- Pfizer Worldwide Research and Development, Worldwide
Medicinal Chemistry Groton, Connecticut 06340, United States
| | - Christopher W. am Ende
- Pfizer Worldwide Research and Development, Worldwide
Medicinal Chemistry Groton, Connecticut 06340, United States
| | - Xianzhong Wu
- Chemical
Biology Program, Memorial Sloan Kettering Cancer Center, 1275 York
Avenue, New York, New York 10065, United States
| | - Natalya Gertsik
- Chemical
Biology Program, Memorial Sloan Kettering Cancer Center, 1275 York
Avenue, New York, New York 10065, United States
| | - Douglas S. Johnson
- Pfizer Worldwide Research and Development, Worldwide Medicinal Chemistry, Cambridge, Massachusetts 02139, United States
| | - Yue-Ming Li
- Chemical
Biology Program, Memorial Sloan Kettering Cancer Center, 1275 York
Avenue, New York, New York 10065, United States
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Zoltowska KM, Maesako M, Berezovska O. Interrelationship between Changes in the Amyloid β 42/40 Ratio and Presenilin 1 Conformation. Mol Med 2016; 22:329-337. [PMID: 27391800 DOI: 10.2119/molmed.2016.00127] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2016] [Accepted: 07/05/2016] [Indexed: 11/06/2022] Open
Abstract
The ratio of the longer (i.e., Aβ42/Aβ43) to shorter (i.e. Aβ40) species is a critical factor determining amyloid fibril formation, neurotoxicity and progression of the amyloid pathology in Alzheimer's disease. The relative levels of the different Aβ species are affected by activity and conformation of the γ-secretase complex catalytic component - presenilin 1 (PS1). The enzyme exists in a dynamic equilibrium of the conformational states, with so-called "close" conformation associated with the shift of the γ-secretase cleavage towards the production of longer, neurotoxic Aβ species. In the current study, fluorescence lifetime imaging microscopy, spectral Förster resonance energy transfer, calcium imaging and cytotoxicity assays were utilized to explore reciprocal link between the Aβ42 and Aβ40 peptides present at various ratios and PS1 conformation in primary neurons. We report that exposure to Aβ peptides at a relatively high ratio of Aβ42/40 causes conformational change within the PS1 subdomain architecture towards the pathogenic "closed" state. Mechanistically, the Aβ42/40 peptides present at the relatively high ratio increase intracellular calcium levels, which were shown to trigger pathogenic PS1 conformation. This indicates that there is a reciprocal crosstalk between the extracellular Aβ peptides and PS1 conformation within a neuron, with Aβ40 showing some protective effect. The pathogenic shift within the PS1 domain architecture may further shift the production of Aβ peptides towards the longer, neurotoxic Aβ species. These findings link elevated calcium, Aβ42 and PS1/γ-secretase conformation, and offer possible mechanistic explanation of the impending exacerbation of the amyloid pathology.
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Affiliation(s)
- Katarzyna Marta Zoltowska
- MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Department of Neurology, Charlestown, Massachusetts, United States of America
| | - Masato Maesako
- MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Department of Neurology, Charlestown, Massachusetts, United States of America
| | - Oksana Berezovska
- MassGeneral Institute for Neurodegenerative Disease, Massachusetts General Hospital, Harvard Medical School, Department of Neurology, Charlestown, Massachusetts, United States of America
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40
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Conformational Changes in Transmembrane Domain 4 of Presenilin 1 Are Associated with Altered Amyloid-β 42 Production. J Neurosci 2016; 36:1362-72. [PMID: 26818522 DOI: 10.1523/jneurosci.5090-14.2016] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
UNLABELLED γ-Secretase is an intramembrane-cleaving protease that produces amyloid-β peptide 42 (Aβ42), which is the toxic and aggregation-prone species of Aβ that causes Alzheimer's disease. Here, we used the substituted cysteine accessibility method to analyze the structure of transmembrane domains (TMDs) 4 and 5 of human presenilin 1 (PS1), a catalytic subunit of γ-secretase. We revealed that TMD4 and TMD5 face the intramembranous hydrophilic milieu together with TMD1, TMD6, TMD7, and TMD9 of PS1 to form the catalytic pore structure. Notably, we found a correlation in the distance between the cytosolic sides of TMD4/TMD7 and Aβ42 production levels, suggesting that allosteric conformational changes of the cytosolic side of TMD4 affect Aβ42-generating γ-secretase activity. Our results provide new insights into the relationship between the structure and activity of human PS1. SIGNIFICANCE STATEMENT Modulation of γ-secretase activity to reduce toxic amyloid-β peptide species is one plausible therapeutic approaches for Alzheimer's disease. However, precise mechanistic information of γ-secretase still remains unclear. Here we identified the conformational changes in transmembrane domains of presenilin 1 that affect the proteolytic activity of the γ-secretase. Our results highlight the importance of understanding the structural dynamics of presenilin 1 in drug development against Alzheimer's disease.
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Toyn JH, Boy KM, Raybon J, Meredith JE, Robertson AS, Guss V, Hoque N, Sweeney F, Zhuo X, Clarke W, Snow K, Denton RR, Zuev D, Thompson LA, Morrison J, Grace J, Berisha F, Furlong M, Wang JS, Lentz KA, Padmanabha R, Cook L, Wei C, Drexler DM, Macor JE, Albright CF, Gasior M, Olson RE, Hong Q, Soares HD, AbuTarif M, Ahlijanian MK. Robust Translation of γ-Secretase Modulator Pharmacology across Preclinical Species and Human Subjects. J Pharmacol Exp Ther 2016; 358:125-37. [PMID: 27189974 PMCID: PMC4931879 DOI: 10.1124/jpet.116.232249] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Accepted: 04/19/2016] [Indexed: 12/20/2022] Open
Abstract
The amyloid-β peptide (Aβ)—in particular, the 42–amino acid form, Aβ1-42—is thought to play a key role in the pathogenesis of Alzheimer’s disease (AD). Thus, several therapeutic modalities aiming to inhibit Aβ synthesis or increase the clearance of Aβ have entered clinical trials, including γ-secretase inhibitors, anti-Aβ antibodies, and amyloid-β precursor protein cleaving enzyme inhibitors. A unique class of small molecules, γ-secretase modulators (GSMs), selectively reduce Aβ1-42 production, and may also decrease Aβ1-40 while simultaneously increasing one or more shorter Aβ peptides, such as Aβ1-38 and Aβ1-37. GSMs are particularly attractive because they do not alter the total amount of Aβ peptides produced by γ-secretase activity; they spare the processing of other γ-secretase substrates, such as Notch; and they do not cause accumulation of the potentially toxic processing intermediate, β-C-terminal fragment. This report describes the translation of pharmacological activity across species for two novel GSMs, (S)-7-(4-fluorophenyl)-N2-(3-methoxy-4-(3-methyl-1H-1,2,4-triazol-1-yl)phenyl)-N4-methyl-6,7-dihydro-5H-cyclopenta[d]pyrimidine-2,4-diamine (BMS-932481) and (S,Z)-17-(4-chloro-2-fluorophenyl)-34-(3-methyl-1H-1,2,4-triazol-1-yl)-16,17-dihydro-15H-4-oxa-2,9-diaza-1(2,4)-cyclopenta[d]pyrimidina-3(1,3)-benzenacyclononaphan-6-ene (BMS-986133). These GSMs are highly potent in vitro, exhibit dose- and time-dependent activity in vivo, and have consistent levels of pharmacological effect across rats, dogs, monkeys, and human subjects. In rats, the two GSMs exhibit similar pharmacokinetics/pharmacodynamics between the brain and cerebrospinal fluid. In all species, GSM treatment decreased Aβ1-42 and Aβ1-40 levels while increasing Aβ1-38 and Aβ1-37 by a corresponding amount. Thus, the GSM mechanism and central activity translate across preclinical species and humans, thereby validating this therapeutic modality for potential utility in AD.
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Affiliation(s)
- Jeremy H Toyn
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Kenneth M Boy
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Joseph Raybon
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Jere E Meredith
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Alan S Robertson
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Valerie Guss
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Nina Hoque
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Francis Sweeney
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Xiaoliang Zhuo
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Wendy Clarke
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Kimberly Snow
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - R Rex Denton
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Dmitry Zuev
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Lorin A Thompson
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - John Morrison
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - James Grace
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Flora Berisha
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Michael Furlong
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Jun-Sheng Wang
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Kimberly A Lentz
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Ramesh Padmanabha
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Lynda Cook
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Cong Wei
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Dieter M Drexler
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - John E Macor
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Charlie F Albright
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Maciej Gasior
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Richard E Olson
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Quan Hong
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Holly D Soares
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Malaz AbuTarif
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
| | - Michael K Ahlijanian
- Yale University, New Haven, Connecticut (J.H.T.); Bristol-Myers Squibb, Wallingford, Connecticut (K.M.B, J.R., Je.E.M., A.S.R., V.G., N.H., F.S., X.Z., W.C., K.S., R.R.D., L.A.T., J.M., J.G., K.A.L., R.P., L.C., D.M.D., C.F.A., R.E.O., M.K.A.); Pfizer Worldwide Research and Development, Groton, Connecticut (F.S., C.W.); Cantor Colburn LLP, Hartford, Connecticut (D.Z.); Kyowa Hakko Kirin Pharma, Princeton, New Jersey (F.B.); FORUM Pharmaceuticals, Waltham, Massachusetts (M.F.); GSK Consumer Healthcare, Parsippany, New Jersey (J.-S.W.); Bristol-Myers Squibb, Pennington, New Jersey (Jo.E.M., H.D.S., M.A.); Teva Pharmaceuticals, Frazer, Pennsylvania (M.G.); and Eisai, Woodcliff Lake, New Jersey (Q.H.)
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Bursavich MG, Harrison BA, Blain JF. Gamma Secretase Modulators: New Alzheimer's Drugs on the Horizon? J Med Chem 2016; 59:7389-409. [PMID: 27007185 DOI: 10.1021/acs.jmedchem.5b01960] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The rapidly aging population desperately requires new therapies for Alzheimer's disease. Despite years of pharmaceutical research, limited clinical success has been realized, with several failed disease modification therapies in recent years. On the basis of compelling genetic evidence, the pharmaceutical industry has put a large emphasis on brain beta amyloid (Aβ) either through its removal via antibodies or by targeting the proteases responsible for its production. In this Perspective, we focus on the development of small molecules that improve the activity of one such protease, gamma secretase, through an allosteric binding site to preferentially increase the concentration of the shorter non-amyloidogenic Aβ species. After a few early failures due to poor drug-like properties, the industry is now on the cusp of delivering gamma secretase modulators for clinical proof-of-mechanism studies that combine potency and efficacy with improved drug-like properties such as lower cLogP, high central nervous system multiparameter optimization scores, and high sp(3) character.
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Affiliation(s)
- Matthew G Bursavich
- FORUM Pharmaceuticals , 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Bryce A Harrison
- FORUM Pharmaceuticals , 225 Second Avenue, Waltham, Massachusetts 02451, United States
| | - Jean-François Blain
- FORUM Pharmaceuticals , 225 Second Avenue, Waltham, Massachusetts 02451, United States
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43
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Futai E, Osawa S, Cai T, Fujisawa T, Ishiura S, Tomita T. Suppressor Mutations for Presenilin 1 Familial Alzheimer Disease Mutants Modulate γ-Secretase Activities. J Biol Chem 2016; 291:435-46. [PMID: 26559975 PMCID: PMC4697183 DOI: 10.1074/jbc.m114.629287] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 11/07/2015] [Indexed: 12/27/2022] Open
Abstract
γ-Secretase is a multisubunit membrane protein complex containing presenilin (PS1) as a catalytic subunit. Familial Alzheimer disease (FAD) mutations within PS1 were analyzed in yeast cells artificially expressing membrane-bound substrate, amyloid precursor protein, or Notch fused to Gal4 transcriptional activator. The FAD mutations, L166P and G384A (Leu-166 to Pro and Gly-384 to Ala substitution, respectively), were loss-of-function in yeast. We identified five amino acid substitutions that suppress the FAD mutations. The cleavage of amyloid precursor protein or Notch was recovered by the secondary mutations. We also found that secondary mutations alone activated the γ-secretase activity. FAD mutants with suppressor mutations, L432M or S438P within TMD9 together with a missense mutation in the second or sixth loops, regained γ-secretase activity when introduced into presenilin null mouse fibroblasts. Notably, the cells with suppressor mutants produced a decreased amount of Aβ42, which is responsible for Alzheimer disease. These results indicate that the yeast system is useful to screen for mutations and chemicals that modulate γ-secretase activity.
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Affiliation(s)
- Eugene Futai
- From the Department of Molecular and Cell Biology, Graduate School of Agricultural Sciences, Tohoku University, Sendai, Miyagi 981-8555, the Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo 153-8902,
| | - Satoko Osawa
- the Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences and
| | - Tetsuo Cai
- the Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences and Laboratory of Neuropathology and Neuroscience, Faculty of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Tomoya Fujisawa
- From the Department of Molecular and Cell Biology, Graduate School of Agricultural Sciences, Tohoku University, Sendai, Miyagi 981-8555
| | - Shoichi Ishiura
- the Department of Life Sciences, Graduate School of Arts and Sciences, The University of Tokyo, Meguro-ku, Tokyo 153-8902
| | - Taisuke Tomita
- the Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical Sciences and Laboratory of Neuropathology and Neuroscience, Faculty of Pharmaceutical Sciences, The University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
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44
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Brendel M, Jaworska A, Herms J, Trambauer J, Rötzer C, Gildehaus FJ, Carlsen J, Cumming P, Bylund J, Luebbers T, Bartenstein P, Steiner H, Haass C, Baumann K, Rominger A. Amyloid-PET predicts inhibition of de novo plaque formation upon chronic γ-secretase modulator treatment. Mol Psychiatry 2015; 20:1179-87. [PMID: 26055427 PMCID: PMC4759098 DOI: 10.1038/mp.2015.74] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Revised: 03/31/2015] [Accepted: 04/13/2015] [Indexed: 01/18/2023]
Abstract
In a positron-emission tomography (PET) study with the β-amyloid (Aβ) tracer [(18)F]-florbetaben, we previously showed that Aβ deposition in transgenic mice expressing Swedish mutant APP (APP-Swe) mice can be tracked in vivo. γ-Secretase modulators (GSMs) are promising therapeutic agents by reducing generation of the aggregation prone Aβ42 species without blocking general γ-secretase activity. We now aimed to investigate the effects of a novel GSM [8-(4-Fluoro-phenyl)-[1,2,4]triazolo[1,5-a]pyridin-2-yl]-[1-(3-methyl-[1,2,4]thiadiazol-5-yl)-piperidin-4-yl]-amine (RO5506284) displaying high potency in vitro and in vivo on amyloid plaque burden and used longitudinal Aβ-microPET to trace individual animals. Female transgenic (TG) APP-Swe mice aged 12 months (m) were assigned to vehicle (TG-VEH, n=12) and treatment groups (TG-GSM, n=12), which received daily RO5506284 (30 mg kg(-1)) treatment for 6 months. A total of 131 Aβ-PET recordings were acquired at baseline (12 months), follow-up 1 (16 months) and follow-up 2 (18 months, termination scan), whereupon histological and biochemical analyses of Aβ were performed. We analyzed the PET data as VOI-based cortical standard-uptake-value ratios (SUVR), using cerebellum as reference region. Individual plaque load assessed by PET remained nearly constant in the TG-GSM group during 6 months of RO5506284 treatment, whereas it increased progressively in the TG-VEH group. Baseline SUVR in TG-GSM mice correlated with Δ%-SUVR, indicating individual response prediction. Insoluble Aβ42 was reduced by 56% in the TG-GSM versus the TG-VEH group relative to the individual baseline plaque load estimates. Furthermore, plaque size histograms showed differing distribution between groups of TG mice, with fewer small plaques in TG-GSM animals. Taken together, in the first Aβ-PET study monitoring prolonged treatment with a potent GSM in an AD mouse model, we found clear attenuation of de novo amyloidogenesis. Moreover, longitudinal PET allows non-invasive assessment of individual plaque-load kinetics, thereby accommodating inter-animal variations.
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Affiliation(s)
- M Brendel
- Department of Nuclear Medicine, Ludwig-Maximilians-University of Munich, Munich, Germany
| | - A Jaworska
- DZNE—German Center for Neurodegenerative Diseases, Munich, Germany,Laboratory of Neurodegeneration, International Institute of Molecular and Cell Biology, Warsaw, Poland
| | - J Herms
- DZNE—German Center for Neurodegenerative Diseases, Munich, Germany,Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - J Trambauer
- Biomedical Center (BMC), Ludwig-Maximilians-University of Munich, Munich, Germany
| | - C Rötzer
- Department of Nuclear Medicine, Ludwig-Maximilians-University of Munich, Munich, Germany
| | - F-J Gildehaus
- Department of Nuclear Medicine, Ludwig-Maximilians-University of Munich, Munich, Germany
| | - J Carlsen
- Department of Nuclear Medicine, Ludwig-Maximilians-University of Munich, Munich, Germany
| | - P Cumming
- Department of Psychiatry, University of Oslo, Oslo, Norway
| | - J Bylund
- Roche Pharma Research and Early Development, Pharmaceutical Sciences, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Basel, Switzerland
| | - T Luebbers
- Roche Pharma Research and Early Development, Small Molecule Research, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Basel, Switzerland
| | - P Bartenstein
- Department of Nuclear Medicine, Ludwig-Maximilians-University of Munich, Munich, Germany,Munich Cluster for Systems Neurology (SyNergy), Munich, Germany
| | - H Steiner
- DZNE—German Center for Neurodegenerative Diseases, Munich, Germany,Biomedical Center (BMC), Ludwig-Maximilians-University of Munich, Munich, Germany
| | - C Haass
- DZNE—German Center for Neurodegenerative Diseases, Munich, Germany,Munich Cluster for Systems Neurology (SyNergy), Munich, Germany,Biomedical Center (BMC), Ludwig-Maximilians-University of Munich, Munich, Germany
| | - K Baumann
- Roche Pharma Research and Early Development, Neuroscience Discovery, Roche Innovation Center Basel, F. Hoffmann-La Roche Ltd., Basel, Switzerland
| | - A Rominger
- Department of Nuclear Medicine, Ludwig-Maximilians-University of Munich, Munich, Germany,Munich Cluster for Systems Neurology (SyNergy), Munich, Germany,Department of Nuclear Medicine, Ludwig-Maximilians-University of Munich, Marchioninistr. 15, Munich 81377, Germany. E-mail:
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45
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Ryan NS, Biessels GJ, Kim L, Nicholas JM, Barber PA, Walsh P, Gami P, Morris HR, Bastos-Leite AJ, Schott JM, Beck J, Mead S, Chavez-Gutierrez L, de Strooper B, Rossor MN, Revesz T, Lashley T, Fox NC. Genetic determinants of white matter hyperintensities and amyloid angiopathy in familial Alzheimer's disease. Neurobiol Aging 2015; 36:3140-3151. [PMID: 26410308 DOI: 10.1016/j.neurobiolaging.2015.08.026] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 08/24/2015] [Accepted: 08/26/2015] [Indexed: 12/28/2022]
Abstract
Familial Alzheimer's disease (FAD) treatment trials raise interest in the variable occurrence of cerebral amyloid angiopathy (CAA); an emerging important factor in amyloid-modifying therapy. Previous pathological studies reported particularly severe CAA with postcodon 200 PSEN1 mutations and amyloid beta coding domain APP mutations. As CAA may manifest as white matter hyperintensities (WMH) on magnetic resonance imaging, particularly posteriorly, we investigated WMH in 52 symptomatic FAD patients for associations with mutation position. WMH were visually rated in 39 PSEN1 (18 precodon 200); 13 APP mutation carriers and 25 healthy controls. Ten PSEN1 mutation carriers (5 precodon 200) had postmortem examination. Increased WMH were observed in the PSEN1 postcodon 200 group and in the single APP patient with an amyloid beta coding domain (p.Ala692Gly, Flemish) mutation. WMH burden on MRI correlated with severity of CAA and cotton wool plaques in several areas. The precodon 200 group had younger ages at onset, decreased axonal density and/or integrity, and a greater T-lymphocytic response in occipital deep white matter. Mutation site contributes to the phenotypic and pathological heterogeneity witnessed in FAD.
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Affiliation(s)
- Natalie S Ryan
- Dementia Research Centre, Department of Neurodegenerative Diseases, UCL Institute of Neurology, London, UK.
| | - Geert-Jan Biessels
- Department of Neurology, Brain Center Rudolf Magnus, University Medical Centre, Utrecht, The Netherlands
| | - Lois Kim
- Department of Non-communicable Disease Epidemiology, Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK
| | - Jennifer M Nicholas
- Dementia Research Centre, Department of Neurodegenerative Diseases, UCL Institute of Neurology, London, UK; Department of Medical Statistics, Faculty of Epidemiology and Population Health, London School of Hygiene and Tropical Medicine, London, UK
| | - Philip A Barber
- Dementia Research Centre, Department of Neurodegenerative Diseases, UCL Institute of Neurology, London, UK
| | - Phoebe Walsh
- Department of Molecular Neuroscience, Queen Square Brain Bank, UCL Institute of Neurology, London, UK
| | - Priya Gami
- Department of Molecular Neuroscience, Queen Square Brain Bank, UCL Institute of Neurology, London, UK
| | - Huw R Morris
- Department of Clinical Neuroscience, UCL Institute of Neurology, London, UK
| | - António J Bastos-Leite
- Department of Medical Imaging, Faculty of Medicine, University of Porto, Porto, Portugal
| | - Jonathan M Schott
- Dementia Research Centre, Department of Neurodegenerative Diseases, UCL Institute of Neurology, London, UK
| | - Jon Beck
- MRC Prion Unit, Department of Neurodegenerative Diseases, UCL Institute of Neurology, London, UK
| | - Simon Mead
- MRC Prion Unit, Department of Neurodegenerative Diseases, UCL Institute of Neurology, London, UK
| | - Lucia Chavez-Gutierrez
- VIB Center for the Biology of Disease, Leuven, Belgium; Center for Human Genetics and Leuven Institute for Neurodegenerative Diseases, University of Leuven, Leuven, Belgium
| | - Bart de Strooper
- VIB Center for the Biology of Disease, Leuven, Belgium; Center for Human Genetics and Leuven Institute for Neurodegenerative Diseases, University of Leuven, Leuven, Belgium
| | - Martin N Rossor
- Dementia Research Centre, Department of Neurodegenerative Diseases, UCL Institute of Neurology, London, UK
| | - Tamas Revesz
- Department of Molecular Neuroscience, Queen Square Brain Bank, UCL Institute of Neurology, London, UK
| | - Tammaryn Lashley
- Department of Molecular Neuroscience, Queen Square Brain Bank, UCL Institute of Neurology, London, UK
| | - Nick C Fox
- Dementia Research Centre, Department of Neurodegenerative Diseases, UCL Institute of Neurology, London, UK
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46
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Potent benzoazepinone γ-secretase modulators with improved bioavailability. Bioorg Med Chem Lett 2015; 25:3495-500. [DOI: 10.1016/j.bmcl.2015.06.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2015] [Revised: 06/04/2015] [Accepted: 06/08/2015] [Indexed: 11/22/2022]
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47
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Wang X, Cui J, Li W, Zeng X, Zhao J, Pei G. γ-Secretase Modulators and Inhibitors Induce Different Conformational Changes of Presenilin 1 Revealed by FLIM and FRET. J Alzheimers Dis 2015; 47:927-37. [DOI: 10.3233/jad-150313] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Xin Wang
- State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
- Graduate School, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Jin Cui
- State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
- Graduate School, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Wei Li
- State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
- Graduate School, University of Chinese Academy of Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Xianglu Zeng
- State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
- Shanghai Key Laboratory of Signaling and Disease Research, Laboratory of Receptor-based Bio-medicine, School of Life Sciences and Technology, Tongji University, Shanghai, China
| | - Jian Zhao
- State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Gang Pei
- State Key Laboratory of Cell Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
- School of Life Science and Technology, and the Collaborative Innovation Center for Brain Science, Tongji University, Shanghai, China
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48
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Ling IF, Golde TE, Galasko DR, Koo EH. Modulation of Aβ42 in vivo by γ-secretase modulator in primates and humans. ALZHEIMERS RESEARCH & THERAPY 2015; 7:55. [PMID: 26244059 PMCID: PMC4523931 DOI: 10.1186/s13195-015-0137-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 07/02/2015] [Indexed: 01/10/2023]
Abstract
Introduction Ibuprofen is one of the nonsteroidal anti-inflammatory drugs that have been shown to selectively lower pathogenic amyloid beta-peptide (Aβ)42 without impairing overall γ-secretase activity in vitro. This γ-secretase modulator (GSM) activity has been hypothesized to contribute to the reduction in risk of developing Alzheimer’s disease in chronic users of nonsteroidal anti-inflammatory drugs. However, it is unclear whether ibuprofen, within therapeutic dosing range, demonstrates GSM activity in humans. In this study, we evaluated the effects of ibuprofen and a second-generation GSM, GSM-1, on Aβ levels in cerebrospinal fluid and plasma of young nonhuman primates and humans. Methods Five to seven conscious cynomolgus monkeys (Macaca fascicularis) were nontreated or treated with 30 mg/kg GSM-1 or 50 or 100 mg/kg ibuprofen and the plasma and cerebrospinal fluid were sampled at −8, 0 (baseline or right before treatment), 2, 4, 6, 8, 12, and 24 h postdosing. In addition, sixteen healthy human subjects were randomly assigned to receive either placebo or 800 mg ibuprofen given by intravenous administration and plasma were collected at 0 (before drug infusion), 0.5, 1, 2, 4, 6, 8, 10, and 24 h after dosing. Results A single dose of GSM-1 (30 mg/kg) decreased the ratio of Aβ42 to Aβ40 to 60 % in plasma and the ratio of Aβ42 to total Aβ to 65 % in cerebrospinal fluid from baseline to postdosing in monkeys. However, no significant changes were detected following ibuprofen treatment at 100 mg/kg. Consistent with the results from nonhuman primates, ibuprofen did not alter plasma Aβ levels in human volunteers after a single 800 mg dose. Conclusions GSM-1 exerted potent lowering of the ratio of Aβ42 to Aβ40 in nonhuman primates but the hypothesized GSM activity of ibuprofen could not be demonstrated in nonhuman primates and humans after acute dosing.
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Affiliation(s)
- I-Fang Ling
- Department of Neurosciences, University of California, La Jolla, San Diego, CA USA
| | - Todd E Golde
- Department of Neuroscience, University of Florida, College of Medicine, Gainesville, FL USA
| | - Douglas R Galasko
- Department of Neurosciences, University of California, La Jolla, San Diego, CA USA
| | - Edward H Koo
- Department of Neurosciences, University of California, La Jolla, San Diego, CA USA ; Departments of Medicine and Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
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49
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Jung JI, Price AR, Ladd TB, Ran Y, Park HJ, Ceballos-Diaz C, Smithson LA, Hochhaus G, Tang Y, Akula R, Ba S, Koo EH, Shapiro G, Felsenstein KM, Golde TE. Cholestenoic acid, an endogenous cholesterol metabolite, is a potent γ-secretase modulator. Mol Neurodegener 2015; 10:29. [PMID: 26169917 PMCID: PMC4501119 DOI: 10.1186/s13024-015-0021-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Accepted: 05/29/2015] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Amyloid-β (Aβ) 42 has been implicated as the initiating molecule in the pathogenesis of Alzheimer's disease (AD); thus, therapeutic strategies that target Aβ42 are of great interest. γ-Secretase modulators (GSMs) are small molecules that selectively decrease Aβ42. We have previously reported that many acidic steroids are GSMs with potencies ranging in the low to mid micromolar concentration with 5β-cholanic acid being the most potent steroid identified GSM with half maximal effective concentration (EC50) of 5.7 μM. RESULTS We find that the endogenous cholesterol metabolite, 3β-hydroxy-5-cholestenoic acid (CA), is a steroid GSM with enhanced potency (EC50 of 250 nM) relative to 5β-cholanic acid. CA i) is found in human plasma at ~100-300 nM concentrations ii) has the typical acidic GSM signature of decreasing Aβ42 and increasing Aβ38 levels iii) is active in in vitro γ-secretase assay iv) is made in the brain. To test if CA acts as an endogenous GSM, we used Cyp27a1 knockout (Cyp27a1-/-) and Cyp7b1 knockout (Cyp7b1-/-) mice to investigate if manipulation of cholesterol metabolism pathways relevant to CA formation would affect brain Aβ42 levels. Our data show that Cyp27a1-/- had increased brain Aβ42, whereas Cyp7b1-/- mice had decreased brain Aβ42 levels; however, peripheral dosing of up to 100 mg/kg CA did not affect brain Aβ levels. Structure-activity relationship (SAR) studies with multiple known and novel CA analogs studies failed to reveal CA analogs with increased potency. CONCLUSION These data suggest that CA may act as an endogenous GSM within the brain. Although it is conceptually attractive to try and increase the levels of CA in the brain for prevention of AD, our data suggest that this will not be easily accomplished.
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Affiliation(s)
- Joo In Jung
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, 32610, USA.
- Department of Neuroscience, University of Florida, Gainesville, FL, 32610, USA.
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA.
| | - Ashleigh R Price
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, 32610, USA.
- Department of Neuroscience, University of Florida, Gainesville, FL, 32610, USA.
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA.
| | - Thomas B Ladd
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, 32610, USA.
- Department of Neuroscience, University of Florida, Gainesville, FL, 32610, USA.
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA.
| | - Yong Ran
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, 32610, USA.
- Department of Neuroscience, University of Florida, Gainesville, FL, 32610, USA.
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA.
| | - Hyo-Jin Park
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, 32610, USA.
- Department of Neuroscience, University of Florida, Gainesville, FL, 32610, USA.
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA.
| | - Carolina Ceballos-Diaz
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, 32610, USA.
- Department of Neuroscience, University of Florida, Gainesville, FL, 32610, USA.
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA.
| | - Lisa A Smithson
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, 32610, USA.
- Department of Neuroscience, University of Florida, Gainesville, FL, 32610, USA.
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA.
| | - Günther Hochhaus
- College of Pharmacy, University of Florida, Gainesville, FL, 32610, USA.
| | - Yufei Tang
- College of Pharmacy, University of Florida, Gainesville, FL, 32610, USA.
| | | | - Saritha Ba
- SAI Life Sciences Ltd., Turkapally, AP500078, India.
| | - Edward H Koo
- Department of Neuroscience, University of California, La Jolla, San Diego, CA, 92093, USA.
- Departments of Medicine and Physiology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore, 119077, Singapore.
| | | | - Kevin M Felsenstein
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, 32610, USA.
- Department of Neuroscience, University of Florida, Gainesville, FL, 32610, USA.
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA.
| | - Todd E Golde
- Center for Translational Research in Neurodegenerative Disease, University of Florida, Gainesville, FL, 32610, USA.
- Department of Neuroscience, University of Florida, Gainesville, FL, 32610, USA.
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, 32610, USA.
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Natural Product and Natural Product-Derived Gamma Secretase Modulators from Actaea Racemosa Extracts. MEDICINES 2015; 2:127-140. [PMID: 28930205 PMCID: PMC5456218 DOI: 10.3390/medicines2030127] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/30/2015] [Accepted: 06/25/2015] [Indexed: 01/02/2023]
Abstract
Alzheimer's disease is characterized by pathogenic oligomerization, aggregation, and deposition of amyloid beta peptide (Aβ), resulting in severe neuronal toxicity and associated cognitive dysfunction. In particular, increases in the absolute or relative level of the major long form of Aβ, Aβ42, are associated with increased cellular toxicity and rapidity of disease progression. As a result of this observation, screening to identify potential drugs to reduce the level of Aβ42 have been undertaken by way of modulating the proteolytic activity of the gamma secretase complex without compromising its action on other essential substrates such as Notch. In this review we summarize results from a program that sought to develop such gamma secretase modulators based on novel natural products identified in the extract of Actaea racemosa, the well-known botanical black cohosh. Following isolation of compound 1 (SPI-014), an extensive medicinal chemistry effort was undertaken to define the SAR of 1 and related semisynthetic compounds. Major metabolic and physicochemical liabilities in 1 were overcome including replacement of both the sugar and acetate moieties with more stable alternatives that improved drug-like properties and resulted in development candidate 25 (SPI-1865). Unanticipated off-target adrenal toxicity, however, precluded advancement of this series of compounds into clinical development.
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