1
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Poddar MK, Banerjee S, Chakraborty A, Dutta D. Metabolic disorder in Alzheimer's disease. Metab Brain Dis 2021; 36:781-813. [PMID: 33638805 DOI: 10.1007/s11011-021-00673-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 01/14/2021] [Indexed: 12/21/2022]
Abstract
Alzheimer's disease (AD), a well known aging-induced neurodegenerative disease is related to amyloid proteinopathy. This proteinopathy occurs due to abnormalities in protein folding, structure and thereby its function in cells. The root cause of such kind of proteinopathy and its related neurodegeneration is a disorder in metabolism, rather metabolomics of the major as well as minor nutrients. Metabolomics is the most relevant "omics" platform that offers a great potential for the diagnosis and prognosis of neurodegenerative diseases as an individual's metabolome. In recent years, the research on such kinds of neurodegenerative diseases, especially aging-related disorders is broadened its scope towards metabolic function. Different neurotransmitter metabolisms are also involved with AD and its associated neurodegeneration. The genetic and epigenetic backgrounds are also noteworthy. In this review, the physiological changes of AD in relation to its corresponding biochemical, genetic and epigenetic involvements including its (AD) therapeutic aspects are discussed.
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Affiliation(s)
- Mrinal K Poddar
- Department of Pharmaceutical Technology, Jadavpur University, 188, Raja S. C. Mallick Road, Kolkata, 700032, India.
| | - Soumyabrata Banerjee
- Department of Pharmaceutical Technology, Jadavpur University, 188, Raja S. C. Mallick Road, Kolkata, 700032, India
- Departrment of Psychology, Neuroscience Program, Field Neurosciences Institute Research Laboratory for Restorative Neurology, Central Michigan University, Mount Pleasant, MI, 48859, USA
| | - Apala Chakraborty
- Department of Pharmaceutical Technology, Jadavpur University, 188, Raja S. C. Mallick Road, Kolkata, 700032, India
| | - Debasmita Dutta
- Department of Pharmaceutical Technology, Jadavpur University, 188, Raja S. C. Mallick Road, Kolkata, 700032, India
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, ND, 58102, USA
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2
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Insulin-dependent Non-canonical Activation of Notch in Drosophila: A Story of Notch-Induced Muscle Stem Cell Proliferation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2020; 1227:131-144. [PMID: 32072503 DOI: 10.1007/978-3-030-36422-9_9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Notch plays multiple roles both in development and in adult tissue homeostasis. Notch was first identified in Drosophila in which it has then been extensively studied. Among the flag-ship Notch functions we could mention its capacity to keep precursor and stem cells in a nondifferentiated state but also its ability to activate cell proliferation that in some contexts could led to cancer. In general, both these functions involve, canonical, ligand-dependent Notch activation. However, a ligand-independent Notch activation has also been described in a few cellular contexts. Here, we focus on one of such contexts, Drosophila muscle stem cells, called AMPs, and discuss how insulin-dependent noncanonical activation of Notch pushes quiescent AMPs to proliferation.
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3
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Du J, Li S, Su Y, Wang H, Liu H, Cui H. The role of extracellular matrix metalloproteinase inducer on the action of dihydrotestosterone against the cellular damage induced by Aβ 42. Mol Cell Endocrinol 2019; 498:110536. [PMID: 31401349 DOI: 10.1016/j.mce.2019.110536] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/04/2019] [Revised: 08/07/2019] [Accepted: 08/08/2019] [Indexed: 11/24/2022]
Abstract
Clinical studies have revealed that the risk of Alzheimer's disease (AD) in men is increased by age-related androgen depletion. The level of β-amyloid (Aβ) is elevated in the brains of AD patients, and Aβ is believed to play a critical role in the pathology of AD. Some studies have indicated that androgens affect AD risk by regulating the metabolism of Aβ by an unclear mechanism. In this study, we investigated the role of the extracellular matrix metalloproteinase inducer (CD147) in this action. Initially, we demonstrated that androgens positively regulate the expression of CD147 in adult male rats and SH-SY5Y cells. Furthermore, this regulation may involve androgen receptor (AR). Additionally, interference of CD147 expression decreased the clearance of Aβ in culture medium and reduced cell viability. It also affected the morphology of the cells and the expression of apoptosis-related proteins. Finally, we found that interference of CD147 expression blocked the dihydrotestosterone (DHT)-induced reduction in Aβ and the protection of cells. DHT regulates MMP-2's expression through CD147. Together, these results imply that androgen regulation of Aβ and cell protection may be affected by interfering with the expression of CD147.
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Affiliation(s)
- Juan Du
- Department of Anatomy, Hebei Medical University, Shijiazhuang, China; Neuroscience Research Center, Hebei Medical University, Shijiazhuang, China; Human Brain Bank, Hebei Medical University, Shijiazhuang, China
| | - Sha Li
- Department of Anatomy, Hebei Medical University, Shijiazhuang, China; Neuroscience Research Center, Hebei Medical University, Shijiazhuang, China; Human Brain Bank, Hebei Medical University, Shijiazhuang, China
| | - Yuhong Su
- Department of Anatomy, Hebei Medical University, Shijiazhuang, China; Neuroscience Research Center, Hebei Medical University, Shijiazhuang, China
| | - Haidong Wang
- Department of Anatomy, Hebei Medical University, Shijiazhuang, China
| | - Hanjie Liu
- Department of Anatomy, Hebei Medical University, Shijiazhuang, China; The Second Hospital of Hebei Medical University, Shijiazhuang, China
| | - Huixian Cui
- Department of Anatomy, Hebei Medical University, Shijiazhuang, China; Neuroscience Research Center, Hebei Medical University, Shijiazhuang, China; Human Brain Bank, Hebei Medical University, Shijiazhuang, China.
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4
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Schirinzi T, Di Lazzaro G, Sancesario GM, Colona VL, Scaricamazza E, Mercuri NB, Martorana A, Sancesario G. Levels of amyloid-beta-42 and CSF pressure are directly related in patients with Alzheimer's disease. J Neural Transm (Vienna) 2017; 124:1621-1625. [PMID: 28866757 DOI: 10.1007/s00702-017-1786-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Accepted: 08/28/2017] [Indexed: 12/21/2022]
Abstract
Experimental data suggest that the cerebrospinal fluid (CSF) dynamic is involved in the clearance of beta-amyloid, a key event in the pathogenesis of Alzheimer's disease (AD). At this regard no evidence still exists in vivo. In this study we explored the relationships between CSF pressure and AD pathology, as measured with CSF core biomarkers. We enrolled 16 patients with probable AD and 21 controls, collecting demographics, clinical data, CSF opening pressure and CSF levels of beta-amyloid-42 fragment (Aβ42), total-tau (t-tau), phosphorylated-tau-181 (p-tau), albumin and albumin ratio. Differences between the groups were calculated with non-parametric tests, while correlations among all parameters were separately calculated with Spearman's test in each group. The groups significantly differed in biomarkers' concentration with lower Aβ42, and higher t-tau and p-tau in AD patients. Moreover, CSF pressure was significantly lower in AD group (11.0 ± 2.8 vs. 13.3 ± 3.0 mmHg, p < 0.05) and directly correlated with Aβ42 levels (R = 0.512; p < 0.05), but not with other biomarkers or parameters. No significant correlations emerged for biomarkers in control group. AD patients exhibit low CSF pressure whose values are directly and selectively related to CSF Aβ42 levels. This interesting correlation may confirm in vivo the association between CSF dynamic and beta-amyloid metabolism occurring in AD.
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Affiliation(s)
- Tommaso Schirinzi
- Neurology Unit, Department of Systems Medicine, University of Roma Tor Vergata, Via Montpellier 1, 00133, Rome, Italy. .,Department of Neurosciences, IRCCS Bambino Gesù Children Hospital, Rome, Italy.
| | - Giulia Di Lazzaro
- Neurology Unit, Department of Systems Medicine, University of Roma Tor Vergata, Via Montpellier 1, 00133, Rome, Italy
| | | | - Vito Luigi Colona
- Neurology Unit, Department of Systems Medicine, University of Roma Tor Vergata, Via Montpellier 1, 00133, Rome, Italy
| | - Eugenia Scaricamazza
- Neurology Unit, Department of Systems Medicine, University of Roma Tor Vergata, Via Montpellier 1, 00133, Rome, Italy
| | - Nicola Biagio Mercuri
- Neurology Unit, Department of Systems Medicine, University of Roma Tor Vergata, Via Montpellier 1, 00133, Rome, Italy.,IRCCS Fondazione Santa Lucia, Rome, Italy
| | - Alessandro Martorana
- Neurology Unit, Department of Systems Medicine, University of Roma Tor Vergata, Via Montpellier 1, 00133, Rome, Italy
| | - Giuseppe Sancesario
- Neurology Unit, Department of Systems Medicine, University of Roma Tor Vergata, Via Montpellier 1, 00133, Rome, Italy
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5
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Andreeva TV, Lukiw WJ, Rogaev EI. Biological Basis for Amyloidogenesis in Alzheimer's Disease. BIOCHEMISTRY (MOSCOW) 2017; 82:122-139. [PMID: 28320296 DOI: 10.1134/s0006297917020043] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Certain cellular proteins normally soluble in the living organism under certain conditions form aggregates with a specific cross-β sheet structure called amyloid. These intra- or extracellular insoluble aggregates (fibers or plaques) are hallmarks of many neurodegenerative pathologies including Alzheimer's disease (AD), Huntington's disease, Parkinson's disease, prion disease, and other progressive neurological diseases that develop in the aging human central nervous system. Amyloid diseases (amyloidoses) are widespread in the elderly human population, a rapidly expanding demographic in many global populations. Increasing age is the most significant risk factor for neurodegenerative diseases associated with amyloid plaques. To date, nearly three dozen different misfolded proteins targeting brain and other organs have been identified in amyloid diseases and AD, the most prevalent neurodegenerative amyloid disease affecting over 15 million people worldwide. Here we (i) highlight the latest data on mechanisms of amyloid formation and further discuss a hypothesis on the amyloid cascade as a primary mechanism of AD pathogenesis and (ii) review the evolutionary aspects of amyloidosis, which allow new insight on human-specific mechanisms of dementia development.
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Affiliation(s)
- T V Andreeva
- Vavilov Institute of General Genetics, Russian Academy of Sciences, Moscow, 119991, Russia.
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6
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Gibson GE, Thakkar A. Interactions of Mitochondria/Metabolism and Calcium Regulation in Alzheimer's Disease: A Calcinist Point of View. Neurochem Res 2017; 42:1636-1648. [PMID: 28181072 DOI: 10.1007/s11064-017-2182-3] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Revised: 01/12/2017] [Accepted: 01/16/2017] [Indexed: 10/20/2022]
Abstract
Decades of research suggest that alterations in calcium are central to the pathophysiology of Alzheimer's Disease (AD). Highly reproducible changes in calcium dynamics occur in cells from patients with both genetic and non-genetic forms of AD relative to controls. The most robust change is an exaggerated release of calcium from internal stores. Detailed analysis of these changes in animal and cell models of the AD-causing presenilin mutations reveal robust changes in ryanodine receptors, inositol tris-phosphate receptors, calcium leak channels and store activated calcium entry. Similar anomalies in calcium result when AD-like changes in mitochondrial enzymes or oxidative stress are induced experimentally. The calcium abnormalities can be directly linked to the altered tau phosphorylation, amyloid precursor protein processing and synaptic dysfunction that are defining features of AD. A better understanding of these changes is required before using calcium abnormalities as therapeutic targets.
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Affiliation(s)
- Gary E Gibson
- Brain and Mind Research Institute, Weill Cornell Medicine, Burke Medical Research Institute, 785 Mamaroneck Avenue, White Plains, NY, 10605, USA.
| | - Ankita Thakkar
- Brain and Mind Research Institute, Weill Cornell Medicine, Burke Medical Research Institute, 785 Mamaroneck Avenue, White Plains, NY, 10605, USA
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7
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Kuruva CS, Reddy PH. Amyloid beta modulators and neuroprotection in Alzheimer's disease: a critical appraisal. Drug Discov Today 2016; 22:223-233. [PMID: 27794478 DOI: 10.1016/j.drudis.2016.10.010] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 09/16/2016] [Accepted: 10/21/2016] [Indexed: 12/26/2022]
Abstract
Multiple cellular changes have been identified as being involved in Alzheimer's disease (AD) pathogenesis, including mitochondrial damage, synaptic loss, amyloid beta (Aβ) production and/or accumulation, inflammatory responses, and phosphorylated tau formation and/or accumulation. Studies have established that Aβ-induced synaptic dysfunction is dependent on abnormal amyloid precursor protein (APP) processing caused by β- and γ-secretases, resulting in the generation of Aβ. The Aβ formed as a result of abnormal APP processing induces phosphorylated tau and activates glycogen synthase kinase-3β (GSK3β) and cyclin-dependent kinase-5 (CDK5). Here, we review the latest research on the development of Aβ modulators for neuroprotection in AD. We also review the use of molecular inhibitors as therapeutic targets in AD.
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Affiliation(s)
- Chandra Sekhar Kuruva
- Garrison Institute on Aging, Texas Tech University Health Sciences Center, 3601 4th Street, MS 9424, Lubbock, TX 79430, USA
| | - P Hemachandra Reddy
- Garrison Institute on Aging, Texas Tech University Health Sciences Center, 3601 4th Street, MS 9424, Lubbock, TX 79430, USA; Department of Cell Biology & Biochemistry, Texas Tech University Health Sciences Center, 3601 4th Street, MS 9424, Lubbock, TX 79430, USA; Department of Neuroscience & Pharmacology, Texas Tech University Health Sciences Center, 3601 4th Street, MS 9424, Lubbock, TX 79430, USA; Department of Neurology, Texas Tech University Health Sciences Center, 3601 4th Street, MS 9424, Lubbock, TX 79430, USA; Department of Speech, Language and Hearing Sciences, Texas Tech University Health Sciences Center, 3601 4th Street, MS 9424, Lubbock, TX 79430, USA; Garrison Institute on Aging, South West Campus, Texas Tech University Health Sciences Center, 6630 S. Quaker Ste. E, MS 7495, Lubbock, TX 79413, USA.
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8
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Notch signalling pathway as an oncogenic factor involved in cancer development. Contemp Oncol (Pozn) 2016; 20:267-72. [PMID: 27688721 PMCID: PMC5032153 DOI: 10.5114/wo.2016.61845] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Accepted: 09/11/2014] [Indexed: 02/07/2023] Open
Abstract
Notch signalling is an evolutionarily conserved signalling pathway, which plays a significant role in a wide array of cellular processes including proliferation, differentiation, and apoptosis. Nevertheless, it must be noted that Notch is a binary cell fate determinant, and its overexpression has been described as oncogenic in a broad range of human malignancies. This finding led to interest in therapeutically targeting this pathway especially by the use of GSIs, which block the cleavage of Notch at the cell membrane and inhibit release of the transcriptionally active NotchIC subunit. Preclinical cancer models have clearly demonstrated that GSIs suppress the growth of such malignancies as pancreatic, breast, and lung cancer; however, GSI treatment in vivo is associated with side effects, especially those within the gastrointestinal tract. Although intensive studies are associated with the role of γ-secretase in pathological states, it should be pointed out that this complex impacts on proteolytic cleavages of around 55 membrane proteins. Therefore, it is clear that GSIs are highly non-specific and additional drugs must be designed, which will more specifically target components of the Notch signalling.
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9
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Coburger I, Schaub Y, Roeser D, Hardes K, Maeder P, Klee N, Steinmetzer T, Imhof D, Diederich WE, Than ME. Identification of inhibitors of the transmembrane protease FlaK of Methanococcus maripaludis. Microbiologyopen 2016; 5:637-46. [PMID: 27038342 PMCID: PMC4985597 DOI: 10.1002/mbo3.358] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Revised: 02/23/2016] [Accepted: 03/07/2016] [Indexed: 01/17/2023] Open
Abstract
GxGD‐type intramembrane cleaving proteases (I‐CLiPs) form a family of proteolytic enzymes that feature an aspartate‐based catalytic mechanism. Yet, they structurally and functionally largely differ from the classical pepsin‐like aspartic proteases. Among them are the archaeal enzyme FlaK, processing its substrate FlaB2 during the formation of flagella and γ‐secretase, which is centrally involved in the etiology of the neurodegenerative Alzheimer's disease. We developed an optimized activity assay for FlaK and based on screening of a small in‐house library and chemical synthesis, we identified compound 9 as the first inhibitor of this enzyme. Our results show that this intramembrane protease differs from classical pepsin‐like aspartic proteases and give insights into the substrate recognition of this enzyme. By providing the needed tools to further study the enzymatic cycle of FlaK, our results also enable further studies towards a functional understanding of other GxGD‐type I‐CLiPs.
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Affiliation(s)
- Ina Coburger
- Leibniz Institute on Aging (FLI), Protein Crystallography Group, Beutenbergstr. 11, Jena, 07745, Germany
| | - Yvonne Schaub
- Leibniz Institute on Aging (FLI), Protein Crystallography Group, Beutenbergstr. 11, Jena, 07745, Germany
| | - Dirk Roeser
- Leibniz Institute on Aging (FLI), Protein Crystallography Group, Beutenbergstr. 11, Jena, 07745, Germany
| | - Kornelia Hardes
- Department of Pharmaceutical Chemistry, Philipps University Marburg, Marbacher Weg 6, Marburg, 35032, Germany
| | - Patrick Maeder
- Department of Pharmaceutical Chemistry, Philipps University Marburg, Marbacher Weg 6, Marburg, 35032, Germany
| | - Nina Klee
- Department of Pharmaceutical Chemistry, Philipps University Marburg, Marbacher Weg 6, Marburg, 35032, Germany
| | - Torsten Steinmetzer
- Department of Pharmaceutical Chemistry, Philipps University Marburg, Marbacher Weg 6, Marburg, 35032, Germany
| | - Diana Imhof
- Institute of Pharmacy, Pharmaceutical Chemistry I, University of Bonn, Brühler Str. 7, Bonn, 53119, Germany
| | - Wibke E Diederich
- Department of Pharmaceutical Chemistry, Philipps University Marburg, Marbacher Weg 6, Marburg, 35032, Germany
| | - Manuel E Than
- Leibniz Institute on Aging (FLI), Protein Crystallography Group, Beutenbergstr. 11, Jena, 07745, Germany
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10
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Arbor SC, LaFontaine M, Cumbay M. Amyloid-beta Alzheimer targets - protein processing, lipid rafts, and amyloid-beta pores. THE YALE JOURNAL OF BIOLOGY AND MEDICINE 2016; 89:5-21. [PMID: 27505013 PMCID: PMC4797837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
Amyloid beta (Aβ), the hallmark of Alzheimer's Disease (AD), now appears to be deleterious in its low number aggregate form as opposed to the macroscopic Aβ fibers historically seen postmortem. While Alzheimer targets, such as the tau protein, amyloid precursor protein (APP) processing, and immune system activation continue to be investigated, the recent discovery that amyloid beta aggregates at lipid rafts and likely forms neurotoxic pores has led to a new paradigm regarding why past therapeutics may have failed and how to design the next round of compounds for clinical trials. An atomic resolution understanding of Aβ aggregates, which appear to exist in multiple conformations, is most desirable for future therapeutic development. The investigative difficulties, structures of these small Aβ aggregates, and current therapeutics are summarized in this review.
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Affiliation(s)
- Sage C. Arbor
- Marian University College of Osteopathic Medicine, 3200 Cold Spring Road, Indianapolis, Indiana, 46222
| | - Mike LaFontaine
- Marian University College of Osteopathic Medicine, 3200 Cold Spring Road, Indianapolis, Indiana, 46222
| | - Medhane Cumbay
- Marian University College of Osteopathic Medicine, 3200 Cold Spring Road, Indianapolis, Indiana, 46222
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11
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Fischer C, Zultanski SL, Zhou H, Methot JL, Shah S, Hayashi I, Hughes BL, Moxham CM, Bays NW, Smotrov N, Hill AD, Pan BS, Wu Z, Moy LY, Tanga F, Kenific C, Cruz JC, Walker D, Bouthillette M, Nikov GN, Deshmukh SV, Jeliazkova-Mecheva VV, Diaz D, Michener MS, Cook JJ, Munoz B, Shearman MS. Discovery of novel triazolobenzazepinones as γ-secretase modulators with central Aβ42 lowering in rodents and rhesus monkeys. Bioorg Med Chem Lett 2015. [DOI: 10.1016/j.bmcl.2015.07.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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12
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Nogales E, Scheres SHW. Cryo-EM: A Unique Tool for the Visualization of Macromolecular Complexity. Mol Cell 2015; 58:677-89. [PMID: 26000851 DOI: 10.1016/j.molcel.2015.02.019] [Citation(s) in RCA: 235] [Impact Index Per Article: 26.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
3D cryo-electron microscopy (cryo-EM) is an expanding structural biology technique that has recently undergone a quantum leap progression in its achievable resolution and its applicability to the study of challenging biological systems. Because crystallization is not required, only small amounts of sample are needed, and because images can be classified in a computer, the technique has the potential to deal with compositional and conformational mixtures. Therefore, cryo-EM can be used to investigate complete and fully functional macromolecular complexes in different functional states, providing a richness of biological insight. In this review, we underlie some of the principles behind the cryo-EM methodology of single particle analysis and discuss some recent results of its application to challenging systems of paramount biological importance. We place special emphasis on new methodological developments that are leading to an explosion of new studies, many of which are reaching resolutions that could only be dreamed of just a couple of years ago.
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Affiliation(s)
- Eva Nogales
- Molecular and Cell Biology Department, UC Berkeley, Berkeley, CA 94720-3220, USA; Howard Hughes Medical Institute, UC Berkeley, Berkeley, CA 94720-3220, USA; Life Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
| | - Sjors H W Scheres
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge Biomedical Campus, Cambridge CB2 0QH, UK
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13
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Abstract
The small, calcium-sensor protein, calmodulin, is ubiquitously expressed and central to cell function in all cell types. Here the literature linking calmodulin to Alzheimer's disease is reviewed. Several experimentally-verified calmodulin-binding proteins are involved in the formation of amyloid-β plaques including amyloid-β protein precursor, β-secretase, presenilin-1, and ADAM10. Many others possess potential calmodulin-binding domains that remain to be verified. Three calmodulin binding proteins are associated with the formation of neurofibrillary tangles: two kinases (CaMKII, CDK5) and one protein phosphatase (PP2B or calcineurin). Many of the genes recently identified by genome wide association studies and other studies encode proteins that contain putative calmodulin-binding domains but only a couple (e.g., APOE, BIN1) have been experimentally confirmed as calmodulin binding proteins. At least two receptors involved in calcium metabolism and linked to Alzheimer's disease (mAchR; NMDAR) have also been identified as calmodulin-binding proteins. In addition to this, many proteins that are involved in other cellular events intimately associated with Alzheimer's disease including calcium channel function, cholesterol metabolism, neuroinflammation, endocytosis, cell cycle events, and apoptosis have been tentatively or experimentally verified as calmodulin binding proteins. The use of calmodulin as a potential biomarker and as a therapeutic target is discussed.
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Affiliation(s)
- Danton H. O’Day
- Department of Biology, University of Toronto at Mississauga, Mississauga, Ontario, Canada
- Department of Cell and Systems Biology, University of Toronto, Toronto, Ontario, Canada
| | - Kristeen Eshak
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario, Canada
| | - Michael A. Myre
- Center for Human Genetic Research, Richard B. Simches Research Center, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
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14
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Li Y, Bohm C, Dodd R, Chen F, Qamar S, Schmitt-Ulms G, Fraser PE, St George-Hyslop PH. Structural biology of presenilin 1 complexes. Mol Neurodegener 2014; 9:59. [PMID: 25523933 PMCID: PMC4326451 DOI: 10.1186/1750-1326-9-59] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 12/12/2014] [Indexed: 11/17/2022] Open
Abstract
The presenilin genes were first identified as the site of missense mutations causing early onset autosomal dominant familial Alzheimer's disease. Subsequent work has shown that the presenilin proteins are the catalytic subunits of a hetero-tetrameric complex containing APH1, nicastrin and PEN-2. This complex (variously termed presenilin complex or gamma-secretase complex) performs an unusual type of proteolysis in which the transmembrane domains of Type I proteins are cleaved within the hydrophobic compartment of the membrane. This review describes some of the molecular and structural biology of this unusual enzyme complex. The presenilin complex is a bilobed structure. The head domain contains the ectodomain of nicastrin. The base domain contains a central cavity with a lateral cleft that likely provides the route for access of the substrate to the catalytic cavity within the centre of the base domain. There are reciprocal allosteric interactions between various sites in the complex that affect its function. For instance, binding of Compound E, a peptidomimetic inhibitor to the PS1 N-terminus, induces significant conformational changes that reduces substrate binding at the initial substrate docking site, and thus inhibits substrate cleavage. However, there is a reciprocal allosteric interaction between these sites such that prior binding of the substrate to the initial docking site paradoxically increases the binding of the Compound E peptidomimetic inhibitor. Such reciprocal interactions are likely to form the basis of a gating mechanism that underlies access of substrate to the catalytic site. An increasingly detailed understanding of the structural biology of the presenilin complex is an essential step towards rational design of substrate- and/or cleavage site-specific modulators of presenilin complex function.
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Affiliation(s)
| | | | | | | | | | | | | | - Peter H St George-Hyslop
- Cambridge Institute for Medical Research, Wellcome Trust MRC Building, Addenbrookes Hospital, Hills Road, Cambridge CB2 0XY, UK.
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15
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Robinson A, Grösgen S, Mett J, Zimmer VC, Haupenthal VJ, Hundsdörfer B, P. Stahlmann C, Slobodskoy Y, Müller UC, Hartmann T, Stein R, Grimm MOW. Upregulation of PGC-1α expression by Alzheimer's disease-associated pathway: presenilin 1/amyloid precursor protein (APP)/intracellular domain of APP. Aging Cell 2014; 13:263-72. [PMID: 24304563 PMCID: PMC4331788 DOI: 10.1111/acel.12183] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/06/2013] [Indexed: 01/19/2023] Open
Abstract
Cleavage of amyloid precursor protein (APP) by β- and γ-secretase generates amyloid-β (Aβ) and APP intracellular domain (AICD) peptides. Presenilin (PS) 1 or 2 is the catalytic component of the γ-secretase complex. Mitochondrial dysfunction is an established phenomenon in Alzheimer’s disease (AD), but the causes and role of PS1, APP, and APP’s cleavage products in this process are largely unknown. We studied the effect of these AD-associated molecules on mitochondrial features. Using cells deficient in PSs expression, expressing human wild-type PS1, or PS1 familial AD (FAD) mutants, we found that PS1 affects mitochondrial energy metabolism (ATP levels and oxygen consumption) and expression of mitochondrial proteins. These effects were associated with enhanced expression of the mitochondrial master transcriptional coactivator PGC-1α and its target genes. Importantly, PS1-FAD mutations decreased PS1’s ability to enhance PGC-1α mRNA levels. Analyzing the effect of APP and its γ-secretase-derived cleavage products Aβ and AICD on PGC-1α expression showed that APP and AICD increase PGC-1α expression. Accordingly, PGC-1α mRNA levels in cells deficient in APP/APLP2 or expressing APP lacking its last 15 amino acids were lower than in control cells, and treatment with AICD, but not with Aβ, enhanced PGC-1α mRNA levels in these and PSs-deficient cells. In addition, knockdown of the AICD-binding partner Fe65 reduced PGC-1α mRNA levels. Importantly, APP/AICD increases PGC-1α expression also in the mice brain. Our results therefore suggest that APP processing regulates mitochondrial function and that impairments in the newly discovered PS1/APP/AICD/PGC-1α pathway may lead to mitochondrial dysfunction and neurodegeneration.
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Affiliation(s)
- Ari Robinson
- Department of Neurobiology George S. Wise Faculty of Life Sciences Tel Aviv University Ramat Aviv Israel
| | - Sven Grösgen
- Neurodegeneration and Neurobiology Saarland University Homburg/Saar Germany
| | - Janine Mett
- Neurodegeneration and Neurobiology Saarland University Homburg/Saar Germany
| | - Valerie C. Zimmer
- Neurodegeneration and Neurobiology Saarland University Homburg/Saar Germany
| | | | | | | | - Yulia Slobodskoy
- Department of Neurobiology George S. Wise Faculty of Life Sciences Tel Aviv University Ramat Aviv Israel
| | - Ulrike C. Müller
- Department of Functional Genomics Institute of Pharmacy and Molecular Biotechnology Heidelberg University Heidelberg Germany
| | - Tobias Hartmann
- Neurodegeneration and Neurobiology Saarland University Homburg/Saar Germany
- Deutsches Institut für DemenzPrävention (DIDP) Saarland University Homburg/Saar Germany
- Experimental Neurology Saarland University Homburg/Saar Germany
| | - Reuven Stein
- Department of Neurobiology George S. Wise Faculty of Life Sciences Tel Aviv University Ramat Aviv Israel
- Sagol School of Neuroscience Tel Aviv University Tel Aviv Israel
| | - Marcus O. W. Grimm
- Neurodegeneration and Neurobiology Saarland University Homburg/Saar Germany
- Deutsches Institut für DemenzPrävention (DIDP) Saarland University Homburg/Saar Germany
- Experimental Neurology Saarland University Homburg/Saar Germany
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16
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Matsumura N, Takami M, Okochi M, Wada-Kakuda S, Fujiwara H, Tagami S, Funamoto S, Ihara Y, Morishima-Kawashima M. γ-Secretase associated with lipid rafts: multiple interactive pathways in the stepwise processing of β-carboxyl-terminal fragment. J Biol Chem 2013; 289:5109-21. [PMID: 24375443 DOI: 10.1074/jbc.m113.510131] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
γ-Secretase generates amyloid β-protein (Aβ), a pathogenic molecule in Alzheimer disease, through the intramembrane cleavage of the β-carboxyl-terminal fragment (βCTF) of β-amyloid precursor protein. We previously showed the framework of the γ-secretase cleavage, i.e. the stepwise successive processing of βCTF at every three (or four) amino acids. However, the membrane integrity of γ-secretase was not taken into consideration because of the use of the 3-[(3-cholamidopropyl)dimethylammonio]-2-hydroxy-1-propanesulfonic acid-solubilized reconstituted γ-secretase system. Here, we sought to address how the membrane-integrated γ-secretase cleaves βCTF by using γ-secretase associated with lipid rafts. Quantitative analyses using liquid chromatography-tandem mass spectrometry of the βCTF transmembrane domain-derived peptides released along with Aβ generation revealed that the raft-associated γ-secretase cleaves βCTF in a stepwise sequential manner, but novel penta- and hexapeptides as well as tri- and tetrapeptides are released. The cropping of these peptides links the two major tripeptide-cleaving pathways generating Aβ40 and Aβ42 at several points, implying that there are multiple interactive pathways for the stepwise cleavages of βCTF. It should be noted that Aβ38 and Aβ43 are generated through three routes, and γ-secretase modulator 1 enhances all the three routes generating Aβ38, which results in decreases in Aβ42 and Aβ43 and an increase in Aβ38. These observations indicate that multiple interactive pathways for stepwise successive processing by γ-secretase define the species and quantity of Aβ produced.
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Affiliation(s)
- Nobutaka Matsumura
- From the Department of Molecular Neuropathology, Graduate School of Pharmaceutical Sciences, Hokkaido University, Sapporo 060-0812
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17
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Song Y, Hustedt EJ, Brandon S, Sanders CR. Competition between homodimerization and cholesterol binding to the C99 domain of the amyloid precursor protein. Biochemistry 2013; 52:5051-64. [PMID: 23865807 DOI: 10.1021/bi400735x] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The 99-residue transmembrane C-terminal domain (C99, also known as β-CTF) of the amyloid precursor protein (APP) is the product of the β-secretase cleavage of the full-length APP and is the substrate for γ-secretase cleavage. The latter cleavage releases the amyloid-β polypeptides that are closely associated with Alzheimer's disease. C99 is thought to form homodimers; however, the free energy in favor of dimerization has not previously been quantitated. It was also recently documented that cholesterol forms a 1:1 complex with monomeric C99 in bicelles. Here, the affinities for both homodimerization and cholesterol binding to C99 were measured in bilayered lipid vesicles using both electron paramagnetic resonance (EPR) and Förster resonance energy transfer (FRET) methods. Homodimerization and cholesterol binding were seen to be competitive processes that center on the transmembrane G₇₀₀XXXG₇₀₄XXXG₇₀₈ glycine-zipper motif and adjacent Gly709. On one hand, the observed Kd for cholesterol binding (Kd = 2.7 ± 0.3 mol %) is on the low end of the physiological cholesterol concentration range in mammalian cell membranes. On the other hand, the observed K(d) for homodimerization (K(d) = 0.47 ± 0.15 mol %) likely exceeds the physiological concentration range for C99. These results suggest that the 1:1 cholesterol/C99 complex will be more highly populated than C99 homodimers under most physiological conditions. These observations are of relevance for understanding the γ-secretase cleavage of C99.
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Affiliation(s)
- Yuanli Song
- Department of Biochemistry and Center for Structural Biology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232, United States
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18
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Reversible pathologic and cognitive phenotypes in an inducible model of Alzheimer-amyloidosis. J Neurosci 2013; 33:3765-79. [PMID: 23447589 DOI: 10.1523/jneurosci.4251-12.2013] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Transgenic mice that express mutant amyloid precursor protein (APPsi) using tet-Off vector systems provide an alternative model for assessing short- and long-term effects of Aβ-targeting therapies on phenotypes related to the deposition of Alzheimer-type amyloid. Here we use such a model, termed APPsi:tTA, to determine what phenotypes persist in mice with high amyloid burden after new production of APP/Aβ has been suppressed. We find that 12- to 13-month-old APPsi:tTA mice are impaired in cognitive tasks that assess short- and long-term memories. Acutely suppressing new APPsi/Aβ production produced highly significant improvements in performing short-term spatial memory tasks, which upon continued suppression translated to superior performance in more demanding tasks that assess long-term spatial memory and working memory. Deficits in episodic-like memory and cognitive flexibility, however, were more persistent. Arresting mutant APPsi production caused a rapid decline in the brain levels of soluble APP ectodomains, full-length APP, and APP C-terminal fragments. As expected, amyloid deposits persisted after new APP/Aβ production was inhibited, whereas, unexpectedly, we detected persistent pools of solubilizable, relatively mobile, Aβ42. Additionally, we observed persistent levels of Aβ-immunoreactive entities that were of a size consistent with SDS-resistant oligomeric assemblies. Thus, in this model with significant amyloid pathology, a rapid amelioration of cognitive deficits was observed despite persistent levels of oligomeric Aβ assemblies and low, but detectable solubilizable Aβ42 peptides. These findings implicate complex relationships between accumulating Aβ and activities of APP, soluble APP ectodomains, and/or APP C-terminal fragments in mediating cognitive deficits in this model of amyloidosis.
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19
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Novel presenilin-1 Y159F sequence variant associated with early-onset Alzheimer's disease. Neurosci Lett 2012; 531:142-4. [DOI: 10.1016/j.neulet.2012.10.037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2012] [Revised: 10/04/2012] [Accepted: 10/11/2012] [Indexed: 01/06/2023]
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Lo AC, Callaerts-Vegh Z, Nunes AF, Rodrigues CMP, D'Hooge R. Tauroursodeoxycholic acid (TUDCA) supplementation prevents cognitive impairment and amyloid deposition in APP/PS1 mice. Neurobiol Dis 2012; 50:21-9. [PMID: 22974733 DOI: 10.1016/j.nbd.2012.09.003] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2012] [Revised: 08/31/2012] [Accepted: 09/02/2012] [Indexed: 12/17/2022] Open
Abstract
Alzheimer's disease (AD) is a neurodegenerative disease hallmarked by extracellular Aβ(1-42) containing plaques, and intracellular neurofibrillary tangles (NFT) containing hyperphosphorylated tau protein. Progressively, memory deficits and cognitive disabilities start to occur as these hallmarks affect hippocampus and frontal cortex, regions highly involved in memory. Connective tissue growth factor (CTGF) expression, which is high in the vicinity of Aβ plaques and NFTs, was found to influence γ-secretase activity, the molecular crux in Aβ(1-42) production. Tauroursodeoxycholic acid (TUDCA) is an endogenous bile acid that downregulates CTGF expression in hepatocytes and has been shown to possess therapeutic efficacy in neurodegenerative models. To investigate the possible in vivo therapeutic effects of TUDCA, we provided 0.4% TUDCA-supplemented food to APP/PS1 mice, a well-established AD mouse model. Six months of TUDCA supplementation prevented the spatial, recognition and contextual memory defects observed in APP/PS1 mice at 8 months of age. Furthermore, TUDCA-supplemented APP/PS1 mice displayed reduced hippocampal and prefrontal amyloid deposition. These effects of TUDCA supplementation suggest a novel mechanistic route for Alzheimer therapeutics.
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Affiliation(s)
- Adrian C Lo
- Laboratory of Biological Psychology, Faculty of Psychology and Educational Sciences, University of Leuven, Leuven, Belgium
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21
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Nerve growth factor and Alzheimer's disease: new facts for an old hypothesis. Mol Neurobiol 2012; 46:588-604. [PMID: 22940884 DOI: 10.1007/s12035-012-8310-9] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Accepted: 07/12/2012] [Indexed: 01/10/2023]
Abstract
Understanding sporadic Alzheimer's disease (AD) onset and progression requires an explanation of what triggers the common core of abnormal processing of the amyloid precursor protein and tau processing. In the quest for upstream drivers of sporadic, late-onset AD neurodegeneration, nerve growth factor (NGF) has a central role. Initially connected to AD on a purely correlative basis, because of its neurotrophic actions on basal forebrain cholinergic neurons, two independent lines of research, reviewed in this article, place alterations of NGF processing and signaling at the center stage of a new mechanism, leading to the activation of amyloidogenesis and tau processing. Thus, experimental studies on NGF deficit induced neurodegeneration in transgenic mice, as well as the mechanistic studies on the anti-amyloidogenic actions of NGF/TrkA signaling in primary neuronal cultures demonstrated a novel causal link between neurotrophic signaling deficits and Alzheimer's neurodegeneration. Around these results, a new NGF hypothesis can be built, with neurotrophic deficits of various types representing an upstream driver of the core AD triad pathology. According to the new NGF hypothesis for AD, therapies aimed at reestablishing a correct homeostatic balance between ligands (and receptors) of the NGF pathway appear to have a clear and strong rationale, not just as long-term cholinergic neuroprotection, but also as a truly disease-modifying approach.
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Gordon RY, Makarova EG, Podolski IY, Rogachevsky VV, Kordonets OL. Impairment of protein synthesis is an early effect of amyloid-β in neurons. NEUROCHEM J+ 2012. [DOI: 10.1134/s181971241202002x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Mizuno S, Iijima R, Ogishima S, Kikuchi M, Matsuoka Y, Ghosh S, Miyamoto T, Miyashita A, Kuwano R, Tanaka H. AlzPathway: a comprehensive map of signaling pathways of Alzheimer's disease. BMC SYSTEMS BIOLOGY 2012; 6:52. [PMID: 22647208 PMCID: PMC3411424 DOI: 10.1186/1752-0509-6-52] [Citation(s) in RCA: 96] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Accepted: 05/30/2012] [Indexed: 01/19/2023]
Abstract
Background Alzheimer’s disease (AD) is the most common cause of dementia among the elderly. To clarify pathogenesis of AD, thousands of reports have been accumulating. However, knowledge of signaling pathways in the field of AD has not been compiled as a database before. Description Here, we have constructed a publicly available pathway map called “AlzPathway” that comprehensively catalogs signaling pathways in the field of AD. We have collected and manually curated over 100 review articles related to AD, and have built an AD pathway map using CellDesigner. AlzPathway is currently composed of 1347 molecules and 1070 reactions in neuron, brain blood barrier, presynaptic, postsynaptic, astrocyte, and microglial cells and their cellular localizations. AlzPathway is available as both the SBML (Systems Biology Markup Language) map for CellDesigner and the high resolution image map. AlzPathway is also available as a web service (online map) based on Payao system, a community-based, collaborative web service platform for pathway model curation, enabling continuous updates by AD researchers. Conclusions AlzPathway is the first comprehensive map of intra, inter and extra cellular AD signaling pathways which can enable mechanistic deciphering of AD pathogenesis. The AlzPathway map is accessible at http://alzpathway.org/.
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Affiliation(s)
- Satoshi Mizuno
- Department of Bioinformatics, Tokyo Medical and Dental University, Yushima 1-5-45, Tokyo, 113-8510, Japan
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24
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Fischer C, Zultanski SL, Zhou H, Methot JL, Shah S, Nuthall H, Hughes BL, Smotrov N, Hill A, Szewczak AA, Moxham CM, Bays N, Middleton RE, Munoz B, Shearman MS. Triazoloamides as potent γ-secretase modulators with reduced hERG liability. Bioorg Med Chem Lett 2012; 22:3140-6. [DOI: 10.1016/j.bmcl.2012.03.054] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2012] [Revised: 03/08/2012] [Accepted: 03/13/2012] [Indexed: 01/25/2023]
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25
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Lukiw WJ. Amyloid beta (Aβ) peptide modulators and other current treatment strategies for Alzheimer's disease (AD). Expert Opin Emerg Drugs 2012; 17:10.1517/14728214.2012.672559. [PMID: 22439907 PMCID: PMC3399957 DOI: 10.1517/14728214.2012.672559] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Introduction: Alzheimer's disease (AD) is a common, progressive neurological disorder whose incidence is reaching epidemic proportions. The prevailing "amyloid cascade hypothesis," which maintains that the aberrant proteolysis of beta-amyloid precursor protein (βAPP) into neurotoxic amyloid beta (Aβ) peptides is central to the etiopathology of AD, continues to dominate pharmacological approaches to the clinical management of this insidious disorder. This review is a compilation and update on current pharmacological strategies designed to down-regulate Aβ42 peptide generation in an effort to ameliorate the tragedy of AD. Areas covered: This review utilized online data searches at various open online-access websites including the Alzheimer Association, Alzheimer Research Forum; individual drug company databases; the National Institutes of Health (NIH) Medline; Pharmaprojects database; Scopus; inter-University research communications; and unpublished research data. Expert opinion: Anti-acetylcholinesterase-, chelation-, N-methyl-D-aspartate (NMDA) receptor antagonist-, statin-, Aβ immunization-, β-secretase-, γ-secretase-based, and other strategies to modulate βAPP processing, have dominated pharmacological approaches directed against AD-type neurodegenerative pathology. Cumulative clinical results of these efforts remain extremely disappointing, and have had little overall impact on the clinical management of AD. While a number of novel approaches are in consideration and development, to date there is still no effective treatment or cure for this expanding healthcare concern.
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Affiliation(s)
- Walter J Lukiw
- Louisiana State University Health Sciences Center, LSU Neuroscience Center of Excellence, Ophthalmology and Human Genetics, , 2020 Gravier Street, Suite 904, New Orleans LA 70112-2272 , USA +1 504 599 0842 ; +1 504 568 5801 ;
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26
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Crump CJ, am Ende CW, Ballard TE, Pozdnyakov N, Pettersson M, Chau DM, Bales KR, Li YM, Johnson DS. Development of clickable active site-directed photoaffinity probes for γ-secretase. Bioorg Med Chem Lett 2012; 22:2997-3000. [PMID: 22418280 DOI: 10.1016/j.bmcl.2012.02.027] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2012] [Revised: 02/08/2012] [Accepted: 02/10/2012] [Indexed: 12/31/2022]
Abstract
We have developed clickable active site-directed photoaffinity probes for γ-secretase which incorporate a photoreactive benzophenone group and an alkyne handle for subsequent click chemistry mediated conjugation with azide-linked reporter tags for visualization (e.g., TAMRA-azide) or enrichment (e.g., biotin-azide) of labeled proteins. Specifically, we synthesized clickable analogs of L646 (2) and L505 (3) and validated specific labeling to presenilin-1N-terminal fragment (PS1-NTF), the active site aspartyl protease component within the γ-secretase complex. Additionally, we were able to identify signal peptide peptidase (SPP) by Western blot analysis. Furthermore, we analyzed the photo-labeled proteins in an unbiased fashion by click chemistry with TAMRA-azide followed by in-gel fluorescence detection. This approach expands the utility of γ-secretase inhibitor (GSI) photoaffinity probes in that labeled proteins can be tagged with any number of azide-linked reporters groups using a single clickable photoaffinity probe for target pull down and/or fluorescent imaging applications.
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Affiliation(s)
- Christina J Crump
- Molecular Pharmacology and Chemistry Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA
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Subramaniam D, Ponnurangam S, Ramamoorthy P, Standing D, Battafarano RJ, Anant S, Sharma P. Curcumin induces cell death in esophageal cancer cells through modulating Notch signaling. PLoS One 2012; 7:e30590. [PMID: 22363450 PMCID: PMC3281833 DOI: 10.1371/journal.pone.0030590] [Citation(s) in RCA: 179] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2011] [Accepted: 12/19/2011] [Indexed: 12/21/2022] Open
Abstract
Background Curcumin inhibits the growth of esophageal cancer cell lines; however, the mechanism of action is not well understood. It is becoming increasingly clear that aberrant activation of Notch signaling has been associated with the development of esophageal cancer. Here, we have determined that curcumin inhibits esophageal cancer growth via a mechanism mediated through the Notch signaling pathway. Methodology/Principal Findings In this study, we show that curcumin treatment resulted in a dose and time dependent inhibition of proliferation and colony formation in esophageal cancer cell lines. Furthermore, curcumin treatment induced apoptosis through caspase 3 activation, confirmed by an increase in the ratio of Bax to Bcl2. Cell cycle analysis demonstrated that curcumin treatment induced cell death and down regulated cyclin D1 levels. Curcumin treatment also resulted in reduced number and size of esophagospheres. Furthermore, curcumin treatment led to reduced Notch-1 activation, expression of Jagged-1 and its downstream target Hes-1. This reduction in Notch-1 activation was determined to be due to the down-regulation of critical components of the γ-secretase complex proteins such as Presenilin 1 and Nicastrin. The combination of a known γ-secretase inhibitor DAPT and curcumin further decreased proliferation and induced apoptosis in esophageal cancer cells. Finally, curcumin treatment down-regulate the expressions of Notch-1 specific microRNAs miR-21 and miR-34a, and upregulated tumor suppressor let-7a miRNA. Conclusion/Significance Curcumin is a potent inhibitor of esophageal cancer growth that targets the Notch-1 activating γ-secretase complex proteins. These data suggest that Notch signaling inhibition is a novel mechanism of action for curcumin during therapeutic intervention in esophageal cancers.
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Affiliation(s)
- Dharmalingam Subramaniam
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, Kansas, United States of America
- The University of Kansas Cancer Center, University of Kansas Medical Center, Kansas City, Kansas, United States of America
- * (D. Subramaniam); (PS)
| | - Sivapriya Ponnurangam
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, Kansas, United States of America
| | - Prabhu Ramamoorthy
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, Kansas, United States of America
| | - David Standing
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, Kansas, United States of America
| | - Richard J. Battafarano
- Department of Surgery, University of Maryland School of Medicine, Baltimore, Maryland, United States of America
| | - Shrikant Anant
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, Kansas, United States of America
- The University of Kansas Cancer Center, University of Kansas Medical Center, Kansas City, Kansas, United States of America
| | - Prateek Sharma
- Division of Gastroenterology and Hepatology, University of Kansas Medical Center, Kansas City, Kansas, United States of America
- The University of Kansas Cancer Center, University of Kansas Medical Center, Kansas City, Kansas, United States of America
- * (D. Subramaniam); (PS)
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Sato C, Zhao G, Ilagan MXG. An overview of notch signaling in adult tissue renewal and maintenance. Curr Alzheimer Res 2012; 9:227-40. [PMID: 21605032 PMCID: PMC4361071 DOI: 10.2174/156720512799361600] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Revised: 05/27/2011] [Accepted: 06/10/2011] [Indexed: 11/22/2022]
Abstract
The Notch pathway is a critical mediator of short-range cell-cell communication that is reiteratively used to regulate a diverse array of cellular processes during embryonic development and the renewal and maintenance of adult tissues. Most Notch-dependent processes utilize a core signaling mechanism that is dependent on regulated intramembrane proteolysis: Upon ligand binding, Notch receptors undergo ectodomain shedding by ADAM metalloproteases, followed by γ-secretase-mediated intramembrane proteolysis. This releases the Notch intracellular domain, which translocates to the nucleus to activate transcription. In this review, we highlight the roles of Notch signaling particularly in self-renewing tissues in adults and several human diseases and raise some key considerations when targeting ADAMs and γ-secretase as disease-modifying strategies for Alzheimer's Disease.
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Affiliation(s)
- Chihiro Sato
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri, USA 63110
| | - Guojun Zhao
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri, USA 63110
| | - Ma. Xenia G. Ilagan
- Department of Developmental Biology, Washington University School of Medicine, St. Louis, Missouri, USA 63110
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29
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Are γ-secretase and its associated Alzheimer’s disease γ problems? Med Hypotheses 2012; 78:299-304. [DOI: 10.1016/j.mehy.2011.11.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 10/13/2011] [Accepted: 11/08/2011] [Indexed: 01/19/2023]
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30
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Secretase Inhibitors and Modulators as a Disease-Modifying Approach Against Alzheimer's Disease. ANNUAL REPORTS IN MEDICINAL CHEMISTRY 2012. [DOI: 10.1016/b978-0-12-396492-2.00005-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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31
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Subramaniam D, Nicholes ND, Dhar A, Umar S, Awasthi V, Welch DR, Jensen RA, Anant S. 3,5-bis(2,4-difluorobenzylidene)-4-piperidone, a novel compound that affects pancreatic cancer growth and angiogenesis. Mol Cancer Ther 2011; 10:2146-56. [PMID: 21890747 DOI: 10.1158/1535-7163.mct-11-0399] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Dysregulated Notch signaling plays an important role in the progression of cancer. Notch signaling affects tumor growth and angiogenesis through the actions of its ligand Jagged-1. In this study, we developed a novel compound 3,5-bis(2,4-difluorobenzylidene)-4-piperidone (DiFiD) and determined that it inhibits cancer cell growth and its effects on Notch signaling. Intraperitoneal administration of DiFiD significantly suppressed growth of pancreatic cancer tumor xenografts. There was a reduction in CD31-positive blood vessels, suggesting that there was an effect on angiogenesis. In vitro, DiFiD inhibited the proliferation of various human and mouse pancreatic cancer cells while increasing activated caspase-3. Cell-cycle analyses showed that DiFiD induced G(2)-M arrest and decreased the expression of cell-cycle-related proteins cyclin A1 and D1 while upregulating cyclin-dependent kinase inhibitor p21WAF1. We next determined the mechanism of action. DiFiD reduced Notch-1 activation, resulting in reduced expression of its downstream target protein Hes-1. We further determined that the reduced Notch-1 activation was due to reduction in the ligand Jagged-1 and two critical components of the γ-secretase enzyme complex presenilin-1 and nicastrin. Ectopic expression of the Notch intracellular domain rescued the cells from DiFiD-mediated growth suppression. DiFiD-treated tumor xenografts also showed reduced levels of Jagged-1 and the γ-secretase complex proteins presenilin-1 and nicastrin. Taken together, these data suggest that DiFiD is a novel potent therapeutic agent that can target different aspects of the Notch signaling pathway to inhibit both tumor growth and angiogenesis.
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Affiliation(s)
- Dharmalingam Subramaniam
- Department of Molecular and Integrative Physiology, University of Kansas Medical Center, Kansas City, KS 66160, USA.
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Fischer C, Zultanski SL, Zhou H, Methot JL, Brown WC, Mampreian DM, Schell AJ, Shah S, Nuthall H, Hughes BL, Smotrov N, Kenific CM, Cruz JC, Walker D, Bouthillette M, Nikov GN, Savage DF, Jeliazkova-Mecheva VV, Diaz D, Szewczak AA, Bays N, Middleton RE, Munoz B, Shearman MS. Triazoles as γ-secretase modulators. Bioorg Med Chem Lett 2011; 21:4083-7. [DOI: 10.1016/j.bmcl.2011.04.089] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2011] [Revised: 04/18/2011] [Accepted: 04/21/2011] [Indexed: 11/26/2022]
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Sierant M, Paduszynska A, Kazmierczak-Baranska J, Nacmias B, Sorbi S, Bagnoli S, Sochacka E, Nawrot B. Specific Silencing of L392V PSEN1 Mutant Allele by RNA Interference. Int J Alzheimers Dis 2011; 2011:809218. [PMID: 21559198 PMCID: PMC3090069 DOI: 10.4061/2011/809218] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2010] [Accepted: 02/07/2011] [Indexed: 01/07/2023] Open
Abstract
RNA interference (RNAi) technology provides a powerful molecular tool to reduce an expression of selected genes in eukaryotic cells. Short interfering RNAs (siRNAs) are the effector molecules that trigger RNAi. Here, we describe siRNAs that discriminate between the wild type and mutant (1174 C→G) alleles of human Presenilin1 gene (PSEN1). This mutation, resulting in L392V PSEN1 variant, contributes to early onset familial Alzheimer's disease. Using the dual fluorescence assay, flow cytometry and fluorescent microscopy we identified positions 8th–11th, within the central part of the antisense strand, as the most sensitive to mismatches. 2-Thiouridine chemical modification introduced at the 3′-end of the antisense strand improved the allele discrimination, but wobble base pairing adjacent to the mutation site abolished the siRNA activity. Our data indicate that siRNAs can be designed to discriminate between the wild type and mutant alleles of genes that differ by just a single nucleotide.
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Affiliation(s)
- Malgorzata Sierant
- Department of Bioorganic Chemistry, Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, 90-363 Lodz, Sienkiewicza 112, Poland
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Müller M, Cheung KH, Foskett JK. Enhanced ROS generation mediated by Alzheimer's disease presenilin regulation of InsP3R Ca2+ signaling. Antioxid Redox Signal 2011; 14:1225-35. [PMID: 20701429 PMCID: PMC3048838 DOI: 10.1089/ars.2010.3421] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Familial Alzheimer's disease (FAD) is caused by mutations in amyloid precursor protein and presenilins (PS1, PS2). Many FAD-linked PS mutations affect intracellular calcium (Ca(2+)) homeostasis by proximal mechanisms independent of amyloid production by dramatically enhancing gating of the inositol trisphosphate receptor (InsP(3)R) intracellular Ca(2+) release channel by a gain-of-function effect that mirrors genetics of FAD and is independent of secretase activity. Electrophysiological recordings of InsP(3)R in FAD patient B cells, cortical neurons of asymptomatic PS1-AD mice, and other cells revealed they have higher occupancy in a high open probability burst mode, resulting in enhanced Ca(2+) signaling. Exaggerated Ca(2+) signaling through this mechanism results in enhanced generation of reactive oxygen species, believed to be an important component in AD pathogenesis. Exaggerated Ca(2+) signaling through InsP(3)R-PS interaction is a disease specific and robust proximal mechanism in AD that may contribute to the pathology of AD by enhanced generation of reactive oxygen species.
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Affiliation(s)
- Marioly Müller
- Department of Physiology, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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35
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McEvoy LK, Brewer JB. Quantitative structural MRI for early detection of Alzheimer's disease. Expert Rev Neurother 2011; 10:1675-88. [PMID: 20977326 DOI: 10.1586/ern.10.162] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Alzheimer's disease (AD) is a common progressive neurodegenerative disorder that is not currently diagnosed until a patient reaches the stage of dementia. There is a pressing need to identify AD at an earlier stage, so that treatment, when available, can begin early. Quantitative structural MRI is sensitive to the neurodegeneration that occurs in mild and preclinical AD, and is predictive of decline to dementia in individuals with mild cognitive impairment. Objective evidence of ongoing brain atrophy will be critical for risk/benefit decisions once potentially aggressive, disease-modifying treatments become available. Recent advances have paved the way for the use of quantitative structural MRI in clinical practice, and initial clinical use has been promising. However, further experience with these measures in the relatively unselected patient populations seen in clinical practice is needed to complete translation of the recent enormous advances in scientific knowledge of AD into the clinical realm.
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Affiliation(s)
- Linda K McEvoy
- Department of Radiology, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093, USA.
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36
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Bennet AM, Reynolds CA, Eriksson UK, Hong MG, Blennow K, Gatz M, Alexeyenko A, Pedersen NL, Prince JA. Genetic association of sequence variants near AGER/NOTCH4 and dementia. J Alzheimers Dis 2011; 24:475-84. [PMID: 21297263 PMCID: PMC3477600 DOI: 10.3233/jad-2011-101848] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
We performed a survey of sequence variation in a series of 20 genes involved in inflammation-related pathways for association with dementia risk in twin and unrelated case-control samples consisting in total of 1462 Swedish dementia casesand 1929 controls. For a total of 218 tested genetic markers, strong evidence was obtained implicating a region near AGER and NOTCH4 on chromosome 6p with replication across both samples and maximum combined significance at marker rs1800625 (OR = 1.37, 95% CI 1.19–1.56, p = 1.36×10(–6)). Imputation of the associated genomic interval provided an improved signal atrs8365, near the 3UTR of AGER (p = 7.34×10(–7)). The associated region extends 120 kb encompassing 11 candidate genes.While AGER encodes a key receptor for amyloid-β protein, an analysis of network context based upon genes now confirmed to contribute to dementia risk (AβPP, PSEN1, PSEN2, CR1, CLU, PICALM, and APOE) suggested strong functional coupling to NOTCH4, with no significant coupling to the remaining candidates. The implicated region occurs in the broad HLA locus on chromosome 6p, but associated markers were not in strong LD with known variants that regulate HLA gene function, suggesting that this may represent a signal distinct from immune-system pathways.
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Affiliation(s)
- Anna M. Bennet
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Chandra A. Reynolds
- Department of Psychology, University of California at Riverside, Riverside, CA 92521, USA
| | - Ulrika K. Eriksson
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Mun-gwan Hong
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Kaj Blennow
- Institute of Neuroscience and Physiology, Sahlgrenska Academy at University of Gothenburg, 431 80 Mölndal, Sweden
| | - Margaret Gatz
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, 171 77 Stockholm, Sweden
- Department of Psychology, University of Southern California, Los Angeles, CA 90089-1061, USA
| | - Andrey Alexeyenko
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, 171 77 Stockholm, Sweden
| | - Nancy L. Pedersen
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, 171 77 Stockholm, Sweden
- Department of Psychology, University of Southern California, Los Angeles, CA 90089-1061, USA
| | - Jonathan A. Prince
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, 171 77 Stockholm, Sweden
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Oehlrich D, Berthelot DJC, Gijsen HJM. γ-Secretase modulators as potential disease modifying anti-Alzheimer's drugs. J Med Chem 2010; 54:669-98. [PMID: 21141968 DOI: 10.1021/jm101168r] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Daniel Oehlrich
- Medicinal Chemistry, Janssen Research and Development, a Division of Janssen Pharmaceutica NV, Turnhoutseweg 30, 2340 Beerse, Belgium.
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Fischer C, Shah S, Hughes BL, Nikov GN, Crispino JL, Middleton RE, Szewczak AA, Munoz B, Shearman MS. Quinazolinones as γ-secretase modulators. Bioorg Med Chem Lett 2010; 21:773-6. [PMID: 21190851 DOI: 10.1016/j.bmcl.2010.11.111] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2010] [Revised: 11/20/2010] [Accepted: 11/23/2010] [Indexed: 01/17/2023]
Abstract
Synthesis, SAR and evaluation of styrenyl quinazolinones as novel gamma secretase modulators are presented in this communication. Starting from literature and in-house leads we evaluated a range of quinazolinones which showed good modulation of γ-secretase activity.
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Affiliation(s)
- Christian Fischer
- Merck Research Laboratories Boston, 33 Avenue Louis Pasteur, Boston, MA 02115, USA.
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39
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De Strooper B, Annaert W. Novel Research Horizons for Presenilins and γ-Secretases in Cell Biology and Disease. Annu Rev Cell Dev Biol 2010; 26:235-60. [DOI: 10.1146/annurev-cellbio-100109-104117] [Citation(s) in RCA: 199] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Bart De Strooper
- Center for Human Genetics, Katholieke Universiteit Leuven, and Department for Molecular and Developmental Genetics, VIB, Leuven, Belgium; ,
| | - Wim Annaert
- Center for Human Genetics, Katholieke Universiteit Leuven, and Department for Molecular and Developmental Genetics, VIB, Leuven, Belgium; ,
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40
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Bitel CL, Feng Y, Souayah N, Frederikse PH. Increased expression and local accumulation of the prion protein, Alzheimer Aβ peptides, superoxide dismutase 1, and nitric oxide synthases 1 & 2 in muscle in a rabbit model of diabetes. BMC PHYSIOLOGY 2010; 10:18. [PMID: 20819221 PMCID: PMC2944213 DOI: 10.1186/1472-6793-10-18] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2010] [Accepted: 09/06/2010] [Indexed: 12/22/2022]
Abstract
Background Muscle disease associated with different etiologies has been shown to produce localized accumulations of amyloid and oxidative stress-related proteins that are more commonly associated with neurodegeneration in the brain. In this study we examined changes in muscle tissue in a classic model of diabetes and hyperglycemia in rabbits to determine if similar dysregulation of Alzheimer Aβ peptides, the prion protein (PrP), and superoxide dismutase 1 (SOD1), as well as nitric oxide synthases is produced in muscle in diabetic animals. This wild-type rabbit model includes systemic physiological expression of human-like Alzheimer precursor proteins and Aβ peptides that are considered key in Alzheimer protein studies. Results Diabetes was produced in rabbits by injection of the toxic glucose analogue alloxan, which selectively enters pancreatic beta cells and irreversibly decreases insulin production, similar to streptozotocin. Quadriceps muscle from rabbits 16 wks after onset of diabetes and hyperglycemia were analyzed with biochemical and in situ methods. Immunoblots of whole muscle protein samples demonstrated increased PrP, SOD1, as well as neuronal and inducible Nitric oxide synthases (NOS1 and NOS2) in diabetic muscle. In contrast, we detected little change in Alzheimer Aβ precursor protein expression, or BACE1 and Presenilin 1 levels. However, Aβ peptides measured by ELISA increased several fold in diabetic muscle, suggesting a key role for Aβ cleavage in muscle similar to Alzheimer neurodegeneration in this diabetes model. Histological changes in diabetic muscle included localized accumulations of PrP, Aβ, NOS1 and 2, and SOD1, and evidence of increased central nuclei and cell infiltration. Conclusions The present study provides evidence that several classic amyloid and oxidative stress-related disease proteins coordinately increase in overall expression and form localized accumulations in diabetic muscle. The present study highlights the capacity of this wild-type animal model to produce an array of hallmark pathological features that have also been described in other muscle diseases.
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Affiliation(s)
- Claudine L Bitel
- Department of Pharmacology and Physiology, UMDNJ-New Jersey Medical School, 185 S, Orange Ave, Newark, NJ 07103, USA
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41
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Three-amino acid spacing of presenilin endoproteolysis suggests a general stepwise cleavage of gamma-secretase-mediated intramembrane proteolysis. J Neurosci 2010; 30:7853-62. [PMID: 20534834 DOI: 10.1523/jneurosci.1443-10.2010] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Presenilin (PS1 or PS2) is the catalytic component of the gamma-secretase complex, which mediates the final proteolytic processing step leading to the Alzheimer's disease (AD)-characterizing amyloid beta-peptide. PS is cleaved during complex assembly into its characteristic N- and C-terminal fragments. Both fragments are integral components of physiologically active gamma-secretase and harbor the two critical aspartyl residues of the active site domain. While the minimal subunit composition of gamma-secretase has been defined and numerous substrates were identified, the cellular mechanism of the endoproteolytic cleavage of PS is still unclear. We addressed this pivotal question by investigating whether familial AD (FAD)-associated PS1 mutations affect the precision of PS endoproteolysis in a manner similar to the way that such mutations shift the intramembrane cleavage of gamma-secretase substrates. We demonstrate that all FAD mutations investigated still allow endoproteolysis to occur. However, the precision of PS1 endoproteolysis is affected by PS1 mutations. Comparing the cleavage products generated by a variety of PS1 mutants revealed that specifically cleavages at positions 293 and 296 of PS1 are selectively affected. Systematic mutagenesis around the cleavage sites revealed a stepwise three amino acid spaced cleavage mechanism of PS endoproteolysis reminiscent to the epsilon-, zeta-, and gamma-cleavages described for typical gamma-secretase substrates, such as the beta-amyloid precursor protein. Our findings therefore suggest that intramembranous cleavage by gamma-secretase and related intramembrane-cleaving proteases may generally occur via stepwise endoproteolysis.
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Yedvobnick B, Moberg K. Linking model systems to cancer therapeutics: the case of Mastermind. Dis Model Mech 2010; 3:540-4. [PMID: 20663965 DOI: 10.1242/dmm.005520] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Genetics, and more recently genomics, reveal striking conservation in the fundamental signaling pathways that underlie normal and aberrant cell processes. Consequently, various genetic model organisms are now attracting the interest of biomedical scientists who are focused on therapeutic approaches to human disease. There are now several examples of studies in which Drosophila seems likely to facilitate advances in potential therapies, and a recent report has demonstrated the utility of the fly model for understanding and treating human disease. Basic developmental genetic information first obtained in Drosophila was used to design a therapeutic block to oncogenic Notch signaling that was associated with leukemia in mice. The story of Notch signaling in Drosophila demonstrates the potential for standard Drosophila molecular genetics in developing therapeutic strategies that are relevant to human disease.
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Affiliation(s)
- Barry Yedvobnick
- Department of Biology, Emory University, Atlanta, GA 30322, USA.
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Cho HH, Cahill CM, Vanderburg CR, Scherzer CR, Wang B, Huang X, Rogers JT. Selective translational control of the Alzheimer amyloid precursor protein transcript by iron regulatory protein-1. J Biol Chem 2010; 285:31217-32. [PMID: 20558735 DOI: 10.1074/jbc.m110.149161] [Citation(s) in RCA: 130] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Iron influx increases the translation of the Alzheimer amyloid precursor protein (APP) via an iron-responsive element (IRE) RNA stem loop in its 5'-untranslated region. Equal modulated interaction of the iron regulatory proteins (IRP1 and IRP2) with canonical IREs controls iron-dependent translation of the ferritin subunits. However, our immunoprecipitation RT-PCR and RNA binding experiments demonstrated that IRP1, but not IRP2, selectively bound the APP IRE in human neural cells. This selective IRP1 interaction pattern was evident in human brain and blood tissue from normal and Alzheimer disease patients. We computer-predicted an optimal novel RNA stem loop structure for the human, rhesus monkey, and mouse APP IREs with reference to the canonical ferritin IREs but also the IREs encoded by erythroid heme biosynthetic aminolevulinate synthase and Hif-2α mRNAs, which preferentially bind IRP1. Selective 2'-hydroxyl acylation analyzed by primer extension analysis was consistent with a 13-base single-stranded terminal loop and a conserved GC-rich stem. Biotinylated RNA probes deleted of the conserved CAGA motif in the terminal loop did not bind to IRP1 relative to wild type probes and could no longer base pair to form a predicted AGA triloop. An AGU pseudo-triloop is key for IRP1 binding to the canonical ferritin IREs. RNA probes encoding the APP IRE stem loop exhibited the same high affinity binding to rhIRP1 as occurs for the H-ferritin IRE (35 pm). Intracellular iron chelation increased binding of IRP1 to the APP IRE, decreasing intracellular APP expression in SH-SY5Y cells. Functionally, shRNA knockdown of IRP1 caused increased expression of neural APP consistent with IRP1-APP IRE-driven translation.
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Affiliation(s)
- Hyun-Hee Cho
- Neurochemistry Laboratory, Department of Psychiatry-Neuroscience, Massachusetts General Hospital, Harvard Medical School, Charlestown, Massachusetts 02129, USA
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Chow VW, Mattson MP, Wong PC, Gleichmann M. An overview of APP processing enzymes and products. Neuromolecular Med 2010; 12:1-12. [PMID: 20232515 DOI: 10.1007/s12017-009-8104-z] [Citation(s) in RCA: 446] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The generation of amyloid beta-peptide (A beta) by enzymatic cleavages of the beta-amyloid precursor protein (APP) has been at the center of Alzheimer's disease (AD) research. While the basic process of beta- and gamma-secretase-mediated generation of A beta is text book knowledge, new aspects of A beta and other cleavage products have emerged in recent years. Also our understanding of the enzymes involved in APP proteolysis has increased dramatically. All of these discoveries contribute to a more complete understanding of APP processing and the physiologic and pathologic roles of its secreted and intracellular protein products. Understanding APP processing is important for any therapeutic strategy aimed at reducing A beta levels in AD. In this review, we provide a concise description of the current state of understanding the enzymes involved in APP processing, the cleavage products generated by different processing patterns, and the potential functions of those cleavage products.
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Affiliation(s)
- Vivian W Chow
- Department of Pathology, Division of Neuropathology, The Johns Hopkins University School of Medicine, Baltimore, MD, USA
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45
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Calissano P, Amadoro G, Matrone C, Ciafrè S, Marolda R, Corsetti V, Ciotti MT, Mercanti D, Di Luzio A, Severini C, Provenzano C, Canu N. Does the term ‘trophic’ actually mean anti-amyloidogenic? The case of NGF. Cell Death Differ 2010; 17:1126-33. [DOI: 10.1038/cdd.2010.38] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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46
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Cheung KH, Mei L, Mak DOD, Hayashi I, Iwatsubo T, Kang DE, Foskett JK. Gain-of-function enhancement of IP3 receptor modal gating by familial Alzheimer's disease-linked presenilin mutants in human cells and mouse neurons. Sci Signal 2010; 3:ra22. [PMID: 20332427 DOI: 10.1126/scisignal.2000818] [Citation(s) in RCA: 165] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Familial Alzheimer's disease (FAD) is caused by mutations in amyloid precursor protein or presenilins (PS1 and PS2). Many FAD-linked PS mutations affect intracellular calcium (Ca(2+)) homeostasis by mechanisms proximal to and independent of amyloid production, although the molecular details are controversial. We found that several FAD-causing PS mutants enhance gating of the inositol trisphosphate receptor (IP(3)R) Ca(2+) release channel by a gain-of-function effect that mirrored the genetics of FAD and was independent of secretase activity. In contrast, wild-type PS or PS mutants that cause frontotemporal dementia had no such effect. FAD-causing PS mutants altered the modes in which the IP(3)R channel gated. Recordings of endogenous IP(3)R in lymphoblasts derived from individuals with FAD or cortical neurons of asymptomatic PS1-AD mice revealed that they were more likely than IP(3)R in cells with wild-type PS to dwell in a high open-probability burst mode, resulting in enhanced Ca(2+) signaling. These results indicate that exaggerated Ca(2+) signaling through IP(3)R-PS interaction is a disease-specific and robust proximal mechanism in FAD.
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Affiliation(s)
- King-Ho Cheung
- Department of Physiology, University of Pennsylvania, Philadelphia, PA 19104, USA
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47
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Structure and biochemical analysis of the heparin-induced E1 dimer of the amyloid precursor protein. Proc Natl Acad Sci U S A 2010; 107:5381-6. [PMID: 20212142 DOI: 10.1073/pnas.0911326107] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The amyloid precursor protein (APP) is the key player in Alzheimer's disease pathology, yet APP and its analogues are also essential for neuronal development and cell homeostasis in mammals. We have determined the crystal structure of the entire N-terminal APP-E1 domain consisting of the growth factor like and the copper binding domains at 2.7-A resolution and show that E1 functions as a rigid functional entity. The two subdomains interact tightly in a pH-dependent manner via an evolutionarily conserved interface area. Two E1 entities dimerize upon their interaction with heparin, requiring 8-12 sugar rings to form the heparin-bridged APP-E1 dimer in an endothermic and pH-dependent process that is characterized by a low micromolar dissociation constant. Limited proteolysis confirms that the heparin-bridged E1 dimers obtained in solution correspond to a dimer contact in our crystal, enabling us to model this heparin-[APP-E1](2) complex. Correspondingly, the APP-based signal transduction, cell-cell- and/or cell-ECM interaction should depend on dimerization induced by heparin, as well as on pH, arguing that APP could fulfill different functions depending on its (sub)cellular localization.
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Auffret A, Mariani J, Rovira C. Age-Related Progressive Synaptic Dysfunction: The Critical Role of Presenilin 1. Rev Neurosci 2010; 21:239-50. [DOI: 10.1515/revneuro.2010.21.4.239] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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49
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Bakshi P, Jin C, Broutin P, Berhane B, Reed J, Mullan M. Structural optimization of a CXCR2-directed antagonist that indirectly inhibits γ-secretase and reduces Aβ. Bioorg Med Chem 2009; 17:8102-12. [DOI: 10.1016/j.bmc.2009.09.051] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2009] [Revised: 09/17/2009] [Accepted: 09/30/2009] [Indexed: 01/13/2023]
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50
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Kreft AF, Martone R, Porte A. Recent advances in the identification of gamma-secretase inhibitors to clinically test the Abeta oligomer hypothesis of Alzheimer's disease. J Med Chem 2009; 52:6169-88. [PMID: 19694467 DOI: 10.1021/jm900188z] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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