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Delta- and beta- secretases crosstalk amplifies the amyloidogenic pathway in Alzheimer's disease. Prog Neurobiol 2021; 204:102113. [PMID: 34166772 DOI: 10.1016/j.pneurobio.2021.102113] [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] [Received: 12/02/2020] [Revised: 05/17/2021] [Accepted: 06/18/2021] [Indexed: 11/20/2022]
Abstract
Asparagine endopeptidase (AEP), a newly identified delta-secretase, simultaneously cleaves both APP and Tau, promoting Alzheimer's disease (AD) pathologies. However, its pathological role in AD remains incompletely understood. Here we show that delta-secretase cleaves BACE1, a rate-limiting protease in amyloid-β (Aβ) generation, escalating its enzymatic activity and enhancing senile plaques deposit in AD. Delta-secretase binds BACE1 and cuts it at N294 residue in an age-dependent manner and elevates its protease activity. The cleaved N-terminal motif is active even under neutral pH and associates with senile plaques in human AD brains. Subcellular fractionation reveals that delta-secretase and BACE1 reside in the endo-lysosomes. Interestingly, truncated BACE1 enzymatic domain (1-294) augments delta-secretase enzymatic activity and accelerates Aβ production, facilitating AD pathologies and cognitive impairments in APP/PS1 AD mouse model. Uncleavable BACE1 (N294A) inhibits delta-secretase activity and Aβ production and decreases AD pathologies in 5XFAD mice, ameliorating cognitive dysfunctions. Hence, delta- and beta- secretases' crosstalk aggravates each other's roles in AD pathogenesis.
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2
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Hampel H, Lista S, Vanmechelen E, Zetterberg H, Giorgi FS, Galgani A, Blennow K, Caraci F, Das B, Yan R, Vergallo A. β-Secretase1 biological markers for Alzheimer's disease: state-of-art of validation and qualification. Alzheimers Res Ther 2020; 12:130. [PMID: 33066807 PMCID: PMC7566058 DOI: 10.1186/s13195-020-00686-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Accepted: 09/15/2020] [Indexed: 01/09/2023]
Abstract
β-Secretase1 (BACE1) protein concentrations and rates of enzyme activity, analyzed in human bodily fluids, are promising candidate biological markers for guidance in clinical trials investigating BACE1 inhibitors to halt or delay the dysregulation of the amyloid-β pathway in Alzheimer's disease (AD). A robust body of evidence demonstrates an association between cerebrospinal fluid/blood BACE1 biomarkers and core pathophysiological mechanisms of AD, such as brain protein misfolding and aggregration, neurodegeneration, and synaptic dysfunction.In pharmacological trials, BACE1 candidate biomarkers may be applied to a wide set of contexts of use (CoU), including proof of mechanism, dose-finding, response and toxicity dose estimation. For clinical CoU, BACE1 biomarkers show good performance for prognosis and disease prediction.The roadmap toward validation and qualification of BACE1 biomarkers requires standardized pre-analytical and analytical protocols to reduce inter-site variance that may have contributed to inconsistent results.BACE1 biomarker-drug co-development programs, including biomarker-guided outcomes and endpoints, may support the identification of sub-populations with a higher probability to benefit from BACE1 inhibitors with a reduced risk of adverse effects, in line with the evolving precision medicine paradigm.
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Affiliation(s)
- Harald Hampel
- Sorbonne University, GRC no 21, Alzheimer Precision Medicine (APM), AP-HP, Pitié-Salpêtrière Hospital, Paris, France
| | - Simone Lista
- Sorbonne University, GRC no 21, Alzheimer Precision Medicine (APM), AP-HP, Pitié-Salpêtrière Hospital, Paris, France
- Brain & Spine Institute (ICM), INSERM U 1127, CNRS UMR 7225, Boulevard de l'hôpital, F-75013, Paris, France
- Institute of Memory and Alzheimer's Disease (IM2A), Department of Neurology, Pitié-Salpêtrière Hospital, AP-HP, Boulevard de l'hôpital, F-75013, Paris, France
| | | | - Henrik Zetterberg
- Department of Psychiatry and Neurochemistry, Institute of Neuroscience & Physiology, the Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
- Department of Neurodegenerative Disease, UCL Institute of Neurology, Queen Square, London, UK
- UK Dementia Research Institute at UCL, London, UK
| | - Filippo Sean Giorgi
- Human Anatomy, Department of Translational Research and New Technologies in Medicine and Surgery, University of Pisa, Pisa, Italy
| | - Alessandro Galgani
- Department of Clinical and Experimental Medicine, University of Pisa, Pisa, Italy
| | - Kaj Blennow
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden
- Department of Neurodegenerative Disease, UCL Institute of Neurology, Queen Square, London, UK
| | - Filippo Caraci
- Department of Drug Sciences, University of Catania, Catania, Italy
- Oasi Research Institute-IRCCS, Troina, Italy
| | - Brati Das
- Department of Neuroscience, University of Connecticut Health, Farmington, CT, USA
| | - Riqiang Yan
- Department of Neuroscience, University of Connecticut Health, Farmington, CT, USA
| | - Andrea Vergallo
- Sorbonne University, GRC no 21, Alzheimer Precision Medicine (APM), AP-HP, Pitié-Salpêtrière Hospital, Paris, France.
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Bram JMDF, Talib LL, Joaquim HPG, Sarno TA, Gattaz WF, Forlenza OV. Protein levels of ADAM10, BACE1, and PSEN1 in platelets and leukocytes of Alzheimer's disease patients. Eur Arch Psychiatry Clin Neurosci 2019; 269:963-972. [PMID: 29845446 DOI: 10.1007/s00406-018-0905-3] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 05/22/2018] [Indexed: 12/31/2022]
Abstract
The clinical diagnosis of Alzheimer's disease (AD) is a probabilistic formulation that may lack accuracy particularly at early stages of the dementing process. Abnormalities in amyloid-beta precursor protein (APP) metabolism and in the level of APP secretases have been demonstrated in platelets, and to a lesser extent in leukocytes, of AD patients, with conflicting results. The aim of the present study was to compare the protein level of the APP secretases A-disintegrin and metalloprotease 10 (ADAM10), Beta-site APP-cleaving enzyme 1 (BACE1), and presenilin-1 (PSEN1) in platelets and leukocytes from 20 non-medicated older adults with AD and 20 healthy elders, and to determine the potential use of these biomarkers to discriminate cases of AD from controls. The protein levels of all APP secretases were significantly higher in platelets compared to leukocytes. We found statistically a significant decrease in ADAM10 (52.5%, p < 0.0001) and PSEN1 (32%, p = 0.02) in platelets from AD patients compared to controls, but not in leukocytes. Combining all three secretases to generate receiver-operating characteristic (ROC) curves, we found a good discriminatory effect (AD vs. controls) when using platelets (the area under the curve-AUC-0.90, sensitivity 88.9%, specificity 66.7%, p = 0.003), but not in leukocytes (AUC 0.65, sensitivity 77.8%, specificity 50.0%, p = 0.2). Our findings indicate that platelets represent a better biological matrix than leukocytes to address the peripheral level of APP secretases. In addition, combining the protein level of ADAM10, BACE1, and PSEN1 in platelets, yielded a good accuracy to discriminate AD from controls.
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Affiliation(s)
- Jessyka Maria de França Bram
- Laboratorio de Neurociencias (LIM-27), Departamento e Instituto de Psiquiatria, Hospital das Clínicas da Faculdade de Medicina da USP (HCFMUSP), Faculdade de Medicina, Universidade de Sao Paulo, Rua Doutor Ovídio Pires de Campos 785, São Paulo, SP, 05403-010, Brazil
| | - Leda Leme Talib
- Laboratorio de Neurociencias (LIM-27), Departamento e Instituto de Psiquiatria, Hospital das Clínicas da Faculdade de Medicina da USP (HCFMUSP), Faculdade de Medicina, Universidade de Sao Paulo, Rua Doutor Ovídio Pires de Campos 785, São Paulo, SP, 05403-010, Brazil
| | - Helena Passarelli Giroud Joaquim
- Laboratorio de Neurociencias (LIM-27), Departamento e Instituto de Psiquiatria, Hospital das Clínicas da Faculdade de Medicina da USP (HCFMUSP), Faculdade de Medicina, Universidade de Sao Paulo, Rua Doutor Ovídio Pires de Campos 785, São Paulo, SP, 05403-010, Brazil
| | - Tamires Alves Sarno
- Laboratorio de Neurociencias (LIM-27), Departamento e Instituto de Psiquiatria, Hospital das Clínicas da Faculdade de Medicina da USP (HCFMUSP), Faculdade de Medicina, Universidade de Sao Paulo, Rua Doutor Ovídio Pires de Campos 785, São Paulo, SP, 05403-010, Brazil
| | - Wagner Farid Gattaz
- Laboratorio de Neurociencias (LIM-27), Departamento e Instituto de Psiquiatria, Hospital das Clínicas da Faculdade de Medicina da USP (HCFMUSP), Faculdade de Medicina, Universidade de Sao Paulo, Rua Doutor Ovídio Pires de Campos 785, São Paulo, SP, 05403-010, Brazil
| | - Orestes Vicente Forlenza
- Laboratorio de Neurociencias (LIM-27), Departamento e Instituto de Psiquiatria, Hospital das Clínicas da Faculdade de Medicina da USP (HCFMUSP), Faculdade de Medicina, Universidade de Sao Paulo, Rua Doutor Ovídio Pires de Campos 785, São Paulo, SP, 05403-010, Brazil.
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Lopez-Font I, Boix CP, Zetterberg H, Blennow K, Sáez-Valero J. Characterization of Cerebrospinal Fluid BACE1 Species. Mol Neurobiol 2019; 56:8603-8616. [PMID: 31290061 DOI: 10.1007/s12035-019-01677-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 06/10/2019] [Indexed: 11/30/2022]
Abstract
The β-site amyloid precursor protein cleaving enzyme 1 (BACE1) is the main brain β-secretase responsible for the amyloidogenic processing of the amyloid precursor protein (APP). Previous studies have suggested that cerebrospinal fluid (CSF) β-secretase activity may be a candidate diagnostic biomarker for Alzheimer's disease (AD), but biochemical characterization of BACE1 protein in CSF is needed. CSF samples from 19 AD patients and 19 age-matched non-AD controls (n = 19) were classified according to their Aβ42, total tau, and P-tau CSF biomarker levels. We found that β-secretase activity was higher in the CSF of AD subjects than in that of the controls. We found that the majority of the β-secretase activity in the CSF, measured using a peptide substrate homologous to the BACE1 cleavage site, was not inhibited by specific BACE1 inhibitors. We defined enzymatic activity attributable specifically to BACE1 as the activity that was blocked by the specific inhibitors, which is still higher in AD subjects. BACE1 protein levels were characterized by lectin binding, immunoprecipitation, blue native-PAGE, and western blotting using antibodies against specific protein domains. BACE1 was found to be present in human CSF as a mature form of ~ 70 kDa that probably comprised truncated and full-length species, and also as an immature form of ~ 50 kDa that retains the prodomain. CSF-BACE1 was found to assemble into hetero-complexes containing distinct species. Immunoblotting with an antibody against the C-terminus of BACE1 revealed significantly higher levels of the 70-kDa full-length BACE1, while the 50 kDa immature form remained unaltered. When the 70-kDa species was probed with an antibody against the N-terminus of BACE1 (which does not discriminate between truncated and full-length forms), no increase in immunoreactivity was observed, suggesting that truncated forms of BACE1 do not increase in AD. In conclusion, the complexity of BACE1 species in CSF has to be taken into consideration when determining BACE1 activity and protein levels in CSF as biomarkers of AD.
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Affiliation(s)
- Inmaculada Lopez-Font
- Instituto de Neurociencias de Alicante, Universidad Miguel Hernández-CSIC, Av. Ramón y Cajal s/n, E-03550, Sant Joan d'Alacant, Spain. .,Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Sant Joan d'Alacant, Spain.
| | - Claudia P Boix
- Instituto de Neurociencias de Alicante, Universidad Miguel Hernández-CSIC, Av. Ramón y Cajal s/n, E-03550, Sant Joan d'Alacant, Spain.,Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Sant Joan d'Alacant, Spain
| | - Henrik Zetterberg
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden.,Department of Neuroscience and Physiology, The Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden.,Department of Neurodegenerative Disease, UCL Institute of Neurology, Queen Square, London, UK.,UK Dementia Research Institute at UCL, London, UK
| | - Kaj Blennow
- Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden.,Department of Neuroscience and Physiology, The Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden
| | - Javier Sáez-Valero
- Instituto de Neurociencias de Alicante, Universidad Miguel Hernández-CSIC, Av. Ramón y Cajal s/n, E-03550, Sant Joan d'Alacant, Spain. .,Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED), Sant Joan d'Alacant, Spain.
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Hu H, Li H, Li J, Yu J, Tan L. Genome-wide association study identified ATP6V1H locus influencing cerebrospinal fluid BACE activity. BMC MEDICAL GENETICS 2018; 19:75. [PMID: 29751835 PMCID: PMC5948839 DOI: 10.1186/s12881-018-0603-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 05/02/2018] [Indexed: 12/13/2022]
Abstract
Background The activity of cerebrospinal fluid (CSF) β-site APP cleaving enzyme (BACE) is a potential diagnostic biomarker for Alzheimer disease (AD). Methods A total of 340 non-Hispanic Caucasian participants from the Alzheimer’s Disease Neuroimaging Initiative cohort (ADNI) database were included in this study with quality-controlled CSF BACE and genotype data. Association of CSF BACE with the genetic variants of single nucleotide polymorphisms (SNPs) was assessed using PLINK under the additive genetic model. The P values of all SNPs for CSF BACE were adjusted for multiple comparisons. Results One SNP (rs1481950) in the ATP6V1H gene reached genome-wide significance for associations with CSF BACE (P = 4.88 × 10− 9). The minor allele (G) of rs1481950 was associated with higher CSF BACE activity. Although seven SNPs in SNX31, RORA, CDH23, RGS20, LRRC4C, MAPK6PS1 and LOC105378355 did not reach genome-wide significance (P < 10− 8), they were identified as suggestive loci (P < 10− 5). Conclusion This study identified rs1481950 within ATP6V1H influencing human CSF BACE activity, which indicated that ATP6V1H gene may play some roles in the pathogenesis of neurodegenerative diseases such as AD. Electronic supplementary material The online version of this article (10.1186/s12881-018-0603-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Hao Hu
- Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, No.5 Donghai Middle Road, Qingdao, 266071, Shandong Province, China
| | - Haiyan Li
- Department of Neurology, Weihai Wei People's Hospital, Weihai, China
| | - Jieqiong Li
- Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, No.5 Donghai Middle Road, Qingdao, 266071, Shandong Province, China
| | - Jintai Yu
- Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, No.5 Donghai Middle Road, Qingdao, 266071, Shandong Province, China. .,Clinical Research Center, Qingdao Municipal Hospital, Qingdao University, Qingdao, China. .,Department of Neurology, University of California, San Francisco, 675 Nelson Rising Lane, Suite 190, Box 1207, San Francisco, CA, 94158, USA.
| | - Lan Tan
- Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, No.5 Donghai Middle Road, Qingdao, 266071, Shandong Province, China. .,Clinical Research Center, Qingdao Municipal Hospital, Qingdao University, Qingdao, China.
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Timmers M, Barão S, Van Broeck B, Tesseur I, Slemmon J, De Waepenaert K, Bogert J, Shaw LM, Engelborghs S, Moechars D, Mercken M, Van Nueten L, Tritsmans L, de Strooper B, Streffer JR. BACE1 Dynamics Upon Inhibition with a BACE Inhibitor and Correlation to Downstream Alzheimer's Disease Markers in Elderly Healthy Participants. J Alzheimers Dis 2018; 56:1437-1449. [PMID: 28157093 PMCID: PMC5325057 DOI: 10.3233/jad-160829] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The β-site amyloid-β protein precursor (AβPP) cleaving enzyme-1 (BACE1) is the rate limiting enzyme in the generation of amyloid-β peptide (Aβ) from AβPP, one of the major pathways in Alzheimer's disease (AD) pathology. Increased BACE1 levels and activity have been reported in the brain of patients with sporadic AD. Therefore, changes of BACE1 levels in the cerebrospinal fluid (CSF) have also been investigated as a possible biomarker of the disease. We analyzed BACE1 levels in CSF of elderly healthy participants before and after chronic treatment with a BACE inhibitor (BACEi) and evaluated the correlation between BACE1 levels and downstream AD markers. Overall, BACE1 CSF levels showed strong correlations to all downstream AD markers investigated. This is the first reported finding that shows BACE1 levels in CSF were well correlated to its end product Aβ1 - 42. As previously described, BACE1 levels were strongly correlated to total-tau and phosphorylated tau levels in CSF. Generally, chronic BACE inhibition did not influence BACE1 CSF protein levels. Follow-up studies including early-stage AD pathophysiology and prodromal AD patients will help to understand the importance of measuring BACE1 routinely in daily clinical practice and AD clinical trials.
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Affiliation(s)
- Maarten Timmers
- Janssen Research and Development, A Division of Janssen Pharmaceutica N.V., Beerse, Belgium.,Reference Center for Biological Markers of Dementia (BIODEM), Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
| | - Soraia Barão
- VIB Center for the Biology of Disease, VIB-Leuven, Belgium.,Center for Human Genetics, Universitaire ziekenhuizen and LIND, KU Leuven, Belgium
| | - Bianca Van Broeck
- Janssen Research and Development, A Division of Janssen Pharmaceutica N.V., Beerse, Belgium
| | - Ina Tesseur
- Janssen Research and Development, A Division of Janssen Pharmaceutica N.V., Beerse, Belgium
| | - John Slemmon
- Janssen Research and Development LLC, La Jolla, CA, USA
| | - Katja De Waepenaert
- Janssen Research and Development, A Division of Janssen Pharmaceutica N.V., Beerse, Belgium
| | | | - Leslie M Shaw
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Sebastiaan Engelborghs
- Reference Center for Biological Markers of Dementia (BIODEM), Institute Born-Bunge, University of Antwerp, Antwerp, Belgium.,Department of Neurology and Memory Clinic, Hospital Network Antwerp (ZNA) Middelheim and Hoge Beuken, Antwerp, Belgium
| | - Dieder Moechars
- Janssen Research and Development, A Division of Janssen Pharmaceutica N.V., Beerse, Belgium
| | - Marc Mercken
- Janssen Research and Development, A Division of Janssen Pharmaceutica N.V., Beerse, Belgium
| | - Luc Van Nueten
- Janssen Research and Development, A Division of Janssen Pharmaceutica N.V., Beerse, Belgium
| | - Luc Tritsmans
- Janssen Research and Development, A Division of Janssen Pharmaceutica N.V., Beerse, Belgium
| | - Bart de Strooper
- VIB Center for the Biology of Disease, VIB-Leuven, Belgium.,Center for Human Genetics, Universitaire ziekenhuizen and LIND, KU Leuven, Belgium.,Institute of Neurology, University College London, UK
| | - Johannes Rolf Streffer
- Janssen Research and Development, A Division of Janssen Pharmaceutica N.V., Beerse, Belgium.,Reference Center for Biological Markers of Dementia (BIODEM), Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
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Understanding Alzheimer's disease by global quantification of protein phosphorylation and sialylated N-linked glycosylation profiles: A chance for new biomarkers in neuroproteomics? J Proteomics 2017; 161:11-25. [DOI: 10.1016/j.jprot.2017.04.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 02/24/2017] [Accepted: 04/03/2017] [Indexed: 12/13/2022]
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Manzine PR, Souza MDS, Cominetti MR. BACE1 levels are increased in plasma of Alzheimer's disease patients compared with matched cognitively healthy controls. Per Med 2016; 13:531-540. [DOI: 10.2217/pme-2016-0033] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Aim: BACE1 is the secretase that acts in Aβ production in Alzheimer's disease (AD). Materials & methods: We investigated mRNA expression in total blood and the levels of plasma protein BACE1 in AD patients compared with cognitively healthy subjects. Probable AD (n = 47) and non-AD control group (n = 32) were evaluated for mRNA expression for BACE1 using reverse transcription-qPCR. A subsample of n = 21 AD and n = 20 non-AD had plasma BACE1 levels analyzed, using ELISA. Results: No differences were found on BACE1 mRNA between groups. However, higher levels of BACE1 were detected in plasma of AD patients. Discussion: Blood-based diagnostic tools are desired to improve AD diagnosis. BACE1 plasma levels could provide an additional diagnostic tool for AD in association with neuropsychological tests.
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Affiliation(s)
- Patricia Regina Manzine
- Departamento de Gerontologia, Rodovia Washington Luís, Km 235, CEP 13565-905, São Carlos, SP, Brazil
| | - Matheus da Silva Souza
- Departamento de Gerontologia, Rodovia Washington Luís, Km 235, CEP 13565-905, São Carlos, SP, Brazil
| | - Márcia Regina Cominetti
- Departamento de Gerontologia, Rodovia Washington Luís, Km 235, CEP 13565-905, São Carlos, SP, Brazil
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Lista S, O'Bryant SE, Blennow K, Dubois B, Hugon J, Zetterberg H, Hampel H. Biomarkers in Sporadic and Familial Alzheimer's Disease. J Alzheimers Dis 2016; 47:291-317. [PMID: 26401553 DOI: 10.3233/jad-143006] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Most forms of Alzheimer's disease (AD) are sporadic (sAD) or inherited in a non-Mendelian fashion, and less than 1% of cases are autosomal-dominant. Forms of sAD do not exhibit familial aggregation and are characterized by complex genetic and environmental interactions. Recently, the expansion of genomic methodologies, in association with substantially larger combined cohorts, has resulted in various genome-wide association studies that have identified several novel genetic associations of AD. Currently, the most effective methods for establishing the diagnosis of AD are defined by multi-modal pathways, starting with clinical and neuropsychological assessment, cerebrospinal fluid (CSF) analysis, and brain-imaging procedures, all of which have significant cost- and access-to-care barriers. Consequently, research efforts have focused on the development and validation of non-invasive and generalizable blood-based biomarkers. Among the modalities conceptualized by the systems biology paradigm and utilized in the "exploratory biomarker discovery arena", proteome analysis has received the most attention. However, metabolomics, lipidomics, transcriptomics, and epigenomics have recently become key modalities in the search for AD biomarkers. Interestingly, biomarker changes for familial AD (fAD), in many but not all cases, seem similar to those for sAD. The integration of neurogenetics with systems biology/physiology-based strategies and high-throughput technologies for molecular profiling is expected to help identify the causes, mechanisms, and biomarkers associated with the various forms of AD. Moreover, in order to hypothesize the dynamic trajectories of biomarkers through disease stages and elucidate the mechanisms of biomarker alterations, updated and more sophisticated theoretical models have been proposed for both sAD and fAD.
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Affiliation(s)
- Simone Lista
- AXA Research Fund & UPMC Chair, Paris, France.,Sorbonne Universités, Université Pierre et Marie Curie, Paris 06, Institut de la Mémoire et de la Maladie d'Alzheimer (IM2A) & Institut du Cerveau et de la Moelle épinière (ICM), Département de Neurologie, Hôpital de la Pitié-Salpétrière, Paris, France
| | - Sid E O'Bryant
- Institute for Aging and Alzheimer's Disease Research & Department of Internal Medicine, University of North Texas Health Science Center, Fort Worth, TX, USA
| | - Kaj Blennow
- Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry, The Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden
| | - Bruno Dubois
- Sorbonne Universités, Université Pierre et Marie Curie, Paris 06, Institut de la Mémoire et de la Maladie d'Alzheimer (IM2A) & Institut du Cerveau et de la Moelle épinière (ICM), Département de Neurologie, Hôpital de la Pitié-Salpétrière, Paris, France
| | - Jacques Hugon
- Centre Mémoire de Ressources et de Recherche (CMRR) Paris Nord Ile-de-France, Groupe Hospitalier Saint Louis Lariboisière - Fernand Widal, Université Paris Diderot, Paris 07, Paris, France.,Institut du Fer à Moulin (IFM), Inserm UMR_S 839, Paris, France
| | - Henrik Zetterberg
- Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry, The Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden.,University College London Institute of Neurology, Queen Square, London, UK
| | - Harald Hampel
- AXA Research Fund & UPMC Chair, Paris, France.,Sorbonne Universités, Université Pierre et Marie Curie, Paris 06, Institut de la Mémoire et de la Maladie d'Alzheimer (IM2A) & Institut du Cerveau et de la Moelle épinière (ICM), Département de Neurologie, Hôpital de la Pitié-Salpétrière, Paris, France
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11
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The Alzheimer's Disease Neuroimaging Initiative 2 Biomarker Core: A review of progress and plans. Alzheimers Dement 2016; 11:772-91. [PMID: 26194312 DOI: 10.1016/j.jalz.2015.05.003] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Revised: 05/04/2015] [Accepted: 05/05/2015] [Indexed: 11/20/2022]
Abstract
INTRODUCTION We describe Alzheimer's Disease Neuroimaging Initiative (ADNI) Biomarker Core progress including: the Biobank; cerebrospinal fluid (CSF) amyloid beta (Aβ1-42), t-tau, and p-tau181 analytical performance, definition of Alzheimer's disease (AD) profile for plaque, and tangle burden detection and increased risk for progression to AD; AD disease heterogeneity; progress in standardization; and new studies using ADNI biofluids. METHODS Review publications authored or coauthored by ADNI Biomarker core faculty and selected non-ADNI studies to deepen the understanding and interpretation of CSF Aβ1-42, t-tau, and p-tau181 data. RESULTS CSF AD biomarker measurements with the qualified AlzBio3 immunoassay detects neuropathologic AD hallmarks in preclinical and prodromal disease stages, based on CSF studies in non-ADNI living subjects followed by the autopsy confirmation of AD. Collaboration across ADNI cores generated the temporal ordering model of AD biomarkers varying across individuals because of genetic/environmental factors that increase/decrease resilience to AD pathologies. DISCUSSION Further studies will refine this model and enable the use of biomarkers studied in ADNI clinically and in disease-modifying therapeutic trials.
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12
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BACE1 Physiological Functions May Limit Its Use as Therapeutic Target for Alzheimer's Disease. Trends Neurosci 2016; 39:158-169. [DOI: 10.1016/j.tins.2016.01.003] [Citation(s) in RCA: 122] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Revised: 01/07/2016] [Accepted: 01/08/2016] [Indexed: 01/21/2023]
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Palmigiano A, Barone R, Sturiale L, Sanfilippo C, Bua RO, Romeo DA, Messina A, Capuana ML, Maci T, Le Pira F, Zappia M, Garozzo D. CSF N-glycoproteomics for early diagnosis in Alzheimer's disease. J Proteomics 2016; 131:29-37. [DOI: 10.1016/j.jprot.2015.10.006] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2015] [Revised: 09/03/2015] [Accepted: 10/06/2015] [Indexed: 12/14/2022]
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Ritter A, Cummings J. Fluid Biomarkers in Clinical Trials of Alzheimer's Disease Therapeutics. Front Neurol 2015; 6:186. [PMID: 26379620 PMCID: PMC4553391 DOI: 10.3389/fneur.2015.00186] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2015] [Accepted: 08/10/2015] [Indexed: 02/02/2023] Open
Abstract
With the demographic shift of the global population toward longer life expectancy, the number of people living with Alzheimer’s disease (AD) has rapidly expanded and is projected to triple by the year 2050. Current treatments provide symptomatic relief but do not affect the underlying pathology of the disease. Therapies that prevent or slow the progression of the disease are urgently needed to avoid this growing public health emergency. Insights gained from decades of research have begun to unlock the pathophysiology of this complex disease and have provided targets for disease-modifying therapies. In the last decade, few therapeutic agents designed to modify the underlying disease process have progressed to clinical trials and none have been brought to market. With the focus on disease modification, biomarkers promise to play an increasingly important role in clinical trials. Six biomarkers have now been included in diagnostic criteria for AD and are regularly incorporated into clinical trials. Three biomarkers are neuroimaging measures – hippocampal atrophy measured by magnetic resonance imaging (MRI), amyloid uptake as measured by Pittsburg compound B positron emission tomography (PiB-PET), and decreased fluorodeoxyglucose (18F) uptake as measured by PET (FDG-PET) – and three are sampled from fluid sources – cerebrospinal fluid levels of amyloid β42 (Aβ42), total tau, and phosphorylated tau. Fluid biomarkers are important because they can provide information regarding the underlying biochemical processes that are occurring in the brain. The purpose of this paper is to review the literature regarding the existing and emerging fluid biomarkers and to examine how fluid biomarkers have been incorporated into clinical trials.
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Affiliation(s)
- Aaron Ritter
- Cleveland Clinic Lou Ruvo Center for Brain Health , Las Vegas, NV , USA
| | - Jeffrey Cummings
- Cleveland Clinic Lou Ruvo Center for Brain Health , Las Vegas, NV , USA
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Alcolea D, Martínez-Lage P, Sánchez-Juan P, Olazarán J, Antúnez C, Izagirre A, Ecay-Torres M, Estanga A, Clerigué M, Guisasola MC, Sánchez Ruiz D, Marín Muñoz J, Calero M, Blesa R, Clarimón J, Carmona-Iragui M, Morenas-Rodríguez E, Rodríguez-Rodríguez E, Vázquez Higuera JL, Fortea J, Lleó A. Amyloid precursor protein metabolism and inflammation markers in preclinical Alzheimer disease. Neurology 2015; 85:626-33. [PMID: 26180139 DOI: 10.1212/wnl.0000000000001859] [Citation(s) in RCA: 120] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2015] [Accepted: 04/24/2015] [Indexed: 01/13/2023] Open
Abstract
OBJECTIVE To investigate CSF markers involved in amyloid precursor protein processing, neuronal damage, and neuroinflammation in the preclinical stages of Alzheimer disease (AD) and participants with suspected non-Alzheimer pathology (SNAP). METHODS We collected CSF from 266 cognitively normal volunteers participating in a cross-sectional multicenter study (the SIGNAL study) to investigate markers involved in amyloid precursor protein processing (Aβ42, sAPPβ, β-secretase activity), neuronal damage (total-tau [t-tau], phospho-tau [p-tau]), and neuroinflammation (YKL-40). We analyzed the relationship among biomarkers, clinical variables, and the APOE genotype, and compared biomarker levels across the preclinical stages of the National Institute on Aging-Alzheimer's Association classification: stage 0, 1, 2, 3, and SNAP. RESULTS The median age in the whole cohort was 58.8 years (range 39.8-81.6). Participants in stages 2-3 and SNAP had higher levels of YKL-40 than those in stages 0 and 1. Participants with SNAP had higher levels of sAPPβ than participants in stage 0 and 1. No differences were found between stages 0, 1, and 2-3 in sAPPβ and β-secretase activity in CSF. Age correlated with t-tau, p-tau, and YKL-40. It also correlated with Aβ42, but only in APOE ε4 carriers. Aβ42 correlated positively with t-tau, sAPPβ, and YKL-40 in participants with normal Aβ42. CONCLUSIONS Our findings suggest that inflammation in the CNS increases in normal aging and is intimately related to markers of neurodegeneration in the preclinical stages of AD and SNAP. sAPPβ and β-secretase activity are not useful diagnostic or staging markers in preclinical AD.
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Affiliation(s)
- Daniel Alcolea
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Pablo Martínez-Lage
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Pascual Sánchez-Juan
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Javier Olazarán
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Carmen Antúnez
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Andrea Izagirre
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Mirian Ecay-Torres
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Ainara Estanga
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Montserrat Clerigué
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Maria Concepción Guisasola
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Domingo Sánchez Ruiz
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Juan Marín Muñoz
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Miguel Calero
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Rafael Blesa
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Jordi Clarimón
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - María Carmona-Iragui
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Estrella Morenas-Rodríguez
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Eloy Rodríguez-Rodríguez
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - José Luis Vázquez Higuera
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Juan Fortea
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain
| | - Alberto Lleó
- From the Department of Neurology (D.A., R.B., J.C., M.C.-I., E.M.-R., J.F., A.L.), Institut d'Investigacions Biomèdiques Sant Pau, Hospital de Sant Pau, Universitat Autònoma de Barcelona; Fundación CITA-Alzhéimer Fundazioa (P.M.-L., A.I., M.E.-T., A.E., M.C.), San Sebastián; Servicio de Neurología (P.S.-J., E.R.-R., J.L.V.H.), Hospital Universitario Marqués de Valdecilla, Santander; Servicio de Neurología (J.O., D.S.R.) and Unidad de Medicina Experimental (M.C.G.), Hospital General Gregorio Marañón, Madrid; Unidad de Demencias (C.A., J.M.M.), Hospital Clínico Universitario Virgen de la Arrixaca, Murcia; Instituto de Salud Carlos III (M.C.), CIBERNED, Madrid; Fundación CIEN (J.O., M.C.), Fundación Reina Sofía, Madrid; and Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas, CIBERNED (The SIGNAL Study), Spain.
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Struyfs H, Niemantsverdriet E, Goossens J, Fransen E, Martin JJ, De Deyn PP, Engelborghs S. Cerebrospinal Fluid P-Tau181P: Biomarker for Improved Differential Dementia Diagnosis. Front Neurol 2015; 6:138. [PMID: 26136723 PMCID: PMC4470274 DOI: 10.3389/fneur.2015.00138] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 06/01/2015] [Indexed: 12/12/2022] Open
Abstract
The goal of this study is to investigate the value of tau phosphorylated at threonine 181 (P-tau181P) in the Alzheimer’s disease (AD) cerebrospinal fluid (CSF) biomarker panel for differential dementia diagnosis in autopsy confirmed AD and non-AD patients. The study population consisted of 140 autopsy confirmed AD and 77 autopsy confirmed non-AD dementia patients. CSF concentrations of amyloid-β peptide of 42 amino acids (Aβ1–42), total tau protein (T-tau), and P-tau181P were determined with single analyte ELISA-kits (INNOTEST®, Fujirebio, Ghent, Belgium). Diagnostic accuracy was assessed through receiver operating characteristic (ROC) curve analyses to obtain area under the curve (AUC) values and to define optimal cutoff values to discriminate AD from pooled and individual non-AD groups. ROC curve analyses were only performed on biomarkers and ratios that differed significantly between the groups. Pairwise comparison of AUC values was performed by means of DeLong tests. The Aβ1–42/P-tau181P ratio (AUC = 0.770) performed significantly better than Aβ1–42 (AUC = 0.677, P = 0.004), T-tau (AUC = 0.592, P < 0.001), and Aβ1–42/T-tau (AUC = 0.678, P = 0.001), while P-tau181P (AUC = 0.720) performed significantly better than T-tau (AUC = 0.592, P < 0.001) to discriminate between AD and the pooled non-AD group. When comparing AD and the individual non-AD diagnoses, Aβ1–42/P-tau181P (AUC = 0.894) discriminated AD from frontotemporal dementia significantly better than Aβ1–42 (AUC = 0.776, P = 0.020) and T-tau (AUC = 0.746, P = 0.004), while P-tau181P/T-tau (AUC = 0.958) significantly improved the differentiation between AD and Creutzfeldt-Jakob disease as compared to Aβ1–42 (AUC = 0.688, P = 0.004), T-tau (AUC = 0.874, P = 0.040), and Aβ1–42/P-tau181P (AUC = 0.760, P = 0.003). In conclusion, this study demonstrates P-tau181P is an essential component of the AD CSF biomarker panel, and combined assessment of Aβ1–42, T-tau, and P-tau181P renders, to present date, the highest diagnostic power to discriminate between AD and non-AD dementias.
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Affiliation(s)
- Hanne Struyfs
- Reference Center for Biological Markers of Dementia (BIODEM), Institute Born-Bunge, University of Antwerp , Antwerp , Belgium
| | - Ellis Niemantsverdriet
- Reference Center for Biological Markers of Dementia (BIODEM), Institute Born-Bunge, University of Antwerp , Antwerp , Belgium
| | - Joery Goossens
- Reference Center for Biological Markers of Dementia (BIODEM), Institute Born-Bunge, University of Antwerp , Antwerp , Belgium
| | - Erik Fransen
- StatUa Center for Statistics, University of Antwerp , Antwerp , Belgium
| | | | - Peter P De Deyn
- Reference Center for Biological Markers of Dementia (BIODEM), Institute Born-Bunge, University of Antwerp , Antwerp , Belgium ; Biobank, Institute Born-Bunge, University of Antwerp , Antwerp , Belgium ; Department of Neurology and Memory Clinic, Hospital Network Antwerp (ZNA) Middelheim and Hoge Beuken , Antwerp , Belgium ; Department of Neurology and Alzheimer Research Center, University Medical Center Groningen (UMCG) , Groningen , Netherlands
| | - Sebastiaan Engelborghs
- Reference Center for Biological Markers of Dementia (BIODEM), Institute Born-Bunge, University of Antwerp , Antwerp , Belgium ; Department of Neurology and Memory Clinic, Hospital Network Antwerp (ZNA) Middelheim and Hoge Beuken , Antwerp , Belgium
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Lopez-Font I, Cuchillo-Ibañez I, Sogorb-Esteve A, García-Ayllón MS, Sáez-Valero J. Transmembrane Amyloid-Related Proteins in CSF as Potential Biomarkers for Alzheimer's Disease. Front Neurol 2015; 6:125. [PMID: 26082753 PMCID: PMC4451586 DOI: 10.3389/fneur.2015.00125] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 05/17/2015] [Indexed: 02/04/2023] Open
Abstract
In the continuing search for new cerebrospinal fluid (CSF) biomarkers for Alzheimer’s disease (AD), reasonable candidates are the secretase enzymes involved in the processing of the amyloid precursor protein (APP), as well as the large proteolytic cleavage fragments sAPPα and sAPPβ. The enzymatic activities of some of these secretases, such as BACE1 and TACE, have been investigated as potential AD biomarkers, and it has been assumed that these activities present in human CSF result from the soluble truncated forms of the membrane-bound enzymes. However, we and others recently identified soluble forms of BACE1 and APP in CSF containing the intracellular domains, as well as the multi-pass transmembrane presenilin-1 (PS1) and other subunits of γ-secretase. We also review recent findings that suggest that most of these soluble transmembrane proteins could display self-association properties based on hydrophobic and/or ionic interactions leading to the formation of heteromeric complexes. The oligomerization state of these potential new biomarkers needs to be taken into consideration for assessing their real potential as CSF biomarkers for AD by adequate molecular tools.
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Affiliation(s)
- Inmaculada Lopez-Font
- Instituto de Neurociencias de Alicante, Universidad Miguel Hernández-CSIC , Sant Joan d'Alacant , Spain ; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED) , Sant Joan d'Alacant , Spain
| | - Inmaculada Cuchillo-Ibañez
- Instituto de Neurociencias de Alicante, Universidad Miguel Hernández-CSIC , Sant Joan d'Alacant , Spain ; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED) , Sant Joan d'Alacant , Spain
| | - Aitana Sogorb-Esteve
- Instituto de Neurociencias de Alicante, Universidad Miguel Hernández-CSIC , Sant Joan d'Alacant , Spain ; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED) , Sant Joan d'Alacant , Spain
| | - María-Salud García-Ayllón
- Instituto de Neurociencias de Alicante, Universidad Miguel Hernández-CSIC , Sant Joan d'Alacant , Spain ; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED) , Sant Joan d'Alacant , Spain ; Unidad de Investigación, Fundación para el Fomento de la Investigación Sanitaria Biomédica de la Comunidad Valenciana (FISABIO), Hospital General Universitario de Elche , Elche , Spain
| | - Javier Sáez-Valero
- Instituto de Neurociencias de Alicante, Universidad Miguel Hernández-CSIC , Sant Joan d'Alacant , Spain ; Centro de Investigación Biomédica en Red sobre Enfermedades Neurodegenerativas (CIBERNED) , Sant Joan d'Alacant , Spain
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Lu H, Zhu XC, Jiang T, Yu JT, Tan L. Body fluid biomarkers in Alzheimer's disease. ANNALS OF TRANSLATIONAL MEDICINE 2015; 3:70. [PMID: 25992369 DOI: 10.3978/j.issn.2305-5839.2015.02.13] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 02/03/2015] [Indexed: 01/09/2023]
Abstract
A heterogeneous and slowly progressive disease with extracellular amyloid-β (Aβ) deposits and intracellular hyperphosphorylated tau protein aggregates, Alzheimer's disease (AD) is already a hard nut to crack, featured with cognitive decline and memory lapse. Body fluid biomarkers are proved to be useful in exploring further study of AD, might benefit for a full comprehension of the etiopathogenesis, an improved precision of the prognosis and diagnosis, and a positive response of treatments. The cerebrospinal fluid biomarkers Aβ, total tau, and hyperphosphorylated tau reflect the main pathologic changes of AD. We also review data from several novel biomarkers, such as, β-site APP cleaving enzyme 1, soluble amyloid precursor proteins α and β, soluble Aβ oligomers and so on, which are associated with the occurrence and deterioration of this disease and couldn't be ignored. The rationale for the clinical use of those biomarkers, the challenges faced with and the properties of the most appropriate biomarkers are also summarized in the paper. We aim to find several ideal biomarkers to improve the diagnosis and optimize the treatment respectively.
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Affiliation(s)
- Huan Lu
- 1 Department of Neurology, Qingdao Municipal Hospital, Nanjing Medical University, Nanjing 210029, China ; 2 Department of Neurology, Nanjing First Hospital, Nanjing Medical University, Nanjing 210029, China ; 3 Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao 266001, China ; 4 Memory and Aging Center, Department of Neurology, University of California, San Francisco, CA 94158, USA
| | - Xi-Chen Zhu
- 1 Department of Neurology, Qingdao Municipal Hospital, Nanjing Medical University, Nanjing 210029, China ; 2 Department of Neurology, Nanjing First Hospital, Nanjing Medical University, Nanjing 210029, China ; 3 Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao 266001, China ; 4 Memory and Aging Center, Department of Neurology, University of California, San Francisco, CA 94158, USA
| | - Teng Jiang
- 1 Department of Neurology, Qingdao Municipal Hospital, Nanjing Medical University, Nanjing 210029, China ; 2 Department of Neurology, Nanjing First Hospital, Nanjing Medical University, Nanjing 210029, China ; 3 Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao 266001, China ; 4 Memory and Aging Center, Department of Neurology, University of California, San Francisco, CA 94158, USA
| | - Jin-Tai Yu
- 1 Department of Neurology, Qingdao Municipal Hospital, Nanjing Medical University, Nanjing 210029, China ; 2 Department of Neurology, Nanjing First Hospital, Nanjing Medical University, Nanjing 210029, China ; 3 Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao 266001, China ; 4 Memory and Aging Center, Department of Neurology, University of California, San Francisco, CA 94158, USA
| | - Lan Tan
- 1 Department of Neurology, Qingdao Municipal Hospital, Nanjing Medical University, Nanjing 210029, China ; 2 Department of Neurology, Nanjing First Hospital, Nanjing Medical University, Nanjing 210029, China ; 3 Department of Neurology, Qingdao Municipal Hospital, School of Medicine, Qingdao University, Qingdao 266001, China ; 4 Memory and Aging Center, Department of Neurology, University of California, San Francisco, CA 94158, USA
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Dewji NN, Singer SJ, Masliah E, Rockenstein E, Kim M, Harber M, Horwood T. Peptides of presenilin-1 bind the amyloid precursor protein ectodomain and offer a novel and specific therapeutic approach to reduce ß-amyloid in Alzheimer's disease. PLoS One 2015; 10:e0122451. [PMID: 25923432 PMCID: PMC4414571 DOI: 10.1371/journal.pone.0122451] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Accepted: 02/12/2015] [Indexed: 12/19/2022] Open
Abstract
β-Amyloid (Aβ) accumulation in the brain is widely accepted to be critical to the development of Alzheimer's disease (AD). Current efforts at reducing toxic Aβ40 or 42 have largely focused on modulating γ-secretase activity to produce shorter, less toxic Aβ, while attempting to spare other secretase functions. In this paper we provide data that offer the potential for a new approach for the treatment of AD. The method is based on our previous findings that the production of Aβ from the interaction between the β-amyloid precursor protein (APP) and Presenilin (PS), as part of the γ-secretase complex, in cell culture is largely inhibited if the entire water-soluble NH2-terminal domain of PS is first added to the culture. Here we demonstrate that two small, non-overlapping water-soluble peptides from the PS-1 NH2-terminal domain can substantially and specifically inhibit the production of total Aβ as well as Aβ40 and 42 in vitro and in vivo in the brains of APP transgenic mice. These results suggest that the inhibitory activity of the entire amino terminal domain of PS-1 on Aβ production is largely focused in a few smaller sequences within that domain. Using biolayer interferometry and confocal microscopy we provide evidence that peptides effective in reducing Aβ give a strong, specific and biologically relevant binding with the purified ectodomain of APP 695. Finally, we demonstrate that the reduction of Aβ by the peptides does not affect the catalytic activities of β- or γ-secretase, or the level of APP. P4 and P8 are the first reported protein site-specific small peptides to reduce Aβ production in model systems of AD. These peptides and their derivatives offer new potential drug candidates for the treatment of AD.
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Affiliation(s)
- Nazneen N. Dewji
- Department of Medicine, University of California San Diego, La Jolla, CA, 92093, United States of America
- Cenna Biosciences Incorporated, 505 Coast Boulevard, Suite 302, La Jolla, CA, 92037, United States of America
- * E-mail:
| | - S. Jonathan Singer
- Department of Biology, University of California San Diego, La Jolla, CA, 92093, United States of America
- Cenna Biosciences Incorporated, 505 Coast Boulevard, Suite 302, La Jolla, CA, 92037, United States of America
| | - Eliezer Masliah
- Department of Neurosciences, University of California San Diego, La Jolla, CA, 92093, United States of America
- Department of Pathology, University of California San Diego, La Jolla, CA, 92093, United States of America
| | - Edward Rockenstein
- Department of Neurosciences, University of California San Diego, La Jolla, CA, 92093, United States of America
| | - Mihyun Kim
- Department of Medicine, University of California San Diego, La Jolla, CA, 92093, United States of America
- Cenna Biosciences Incorporated, 505 Coast Boulevard, Suite 302, La Jolla, CA, 92037, United States of America
| | - Martha Harber
- FortéBio, Pall Corporation, 1360 Willow Rd, Suite 201, Menlo Park, CA, 94025, United States of America
| | - Taylor Horwood
- Department of Neuroscience Imaging Core, University of California San Diego, La Jolla, CA, 92093, United States of America
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Savage MJ, Holder DJ, Wu G, Kaplow J, Siuciak JA, Potter WZ. Soluble BACE-1 Activity and sAβPPβ Concentrations in Alzheimer's Disease and Age-Matched Healthy Control Cerebrospinal Fluid from the Alzheimer's Disease Neuroimaging Initiative-1 Baseline Cohort. J Alzheimers Dis 2015; 46:431-40. [PMID: 25790831 PMCID: PMC6287641 DOI: 10.3233/jad-142778] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
β-site amyloid precursor protein-cleaving enzyme 1 (BACE1) plays an important role in the development of Alzheimer's disease (AD), freeing the amyloid-β (Aβ) N-terminus from the amyloid-β protein precursor (AβPP), the first step in Aβ formation. Increased BACE1 activity in AD brain or cerebrospinal fluid (CSF) has been reported. Other studies, however, found either no change or a decrease with AD diagnosis in either BACE1 activity or sAβPPβ, the N-terminal secreted product of BACE1 (sBACE1) activity on AβPP. Here, sBACE1 enzymatic activity and secreted AβPPβ (sAβPPβ) were measured in Alzheimer's Disease Neuroimaging Initiative-1 (ADNI-1) baseline CSF samples and no statistically significant changes were found in either measure comparing healthy control, mild cognitively impaired, or AD individual samples. While CSF sBACE1 activity and sAβPPβ demonstrated a moderate yet significant degree of correlation with each other, there was no correlation of either analyte to CSF Aβ peptide ending at residue 42. Surprisingly, a stronger correlation was demonstrated between CSF sBACE1 activity and tau, which was comparable to that between CSF Aβ₄₂ and tau. Unlike for these latter two analytes, receiver-operator characteristic curves demonstrate that neither CSF sBACE1 activity nor sAβPPβ concentrations can be used to differentiate between healthy elderly and AD individuals.
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Affiliation(s)
| | | | - Guoxin Wu
- Merck and Company, West Point, PA, USA
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21
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Abstract
BACE, a β-secretase, is an attractive potential disease-modifying therapeutic strategy for Alzheimer's disease (AD) as it results directly in the decrease of amyloid precursor protein (APP) processing through the β-secretase pathway and a lowering of CNS amyloid-β (Aβ) levels. The interaction of the β-secretase and α-secretase pathway-mediated processing of APP in the rhesus monkey (nonhuman primate; NHP) CNS is not understood. We hypothesized that CNS inhibition of BACE would result in decreased newly generated Aβ and soluble APPβ (sAPPβ), with increased newly generated sAPPα. A stable isotope labeling kinetics experiment in NHPs was performed with a (13)C6-leucine infusion protocol to evaluate effects of BACE inhibition on CNS APP processing by measuring the kinetics of sAPPα, sAPPβ, and Aβ in CSF. Each NHP received a low, medium, or high dose of MBI-5 (BACE inhibitor) or vehicle in a four-way crossover design. CSF sAPPα, sAPPβ, and Aβ were measured by ELISA and newly incorporated label following immunoprecipitation and liquid chromatography-mass spectrometry. Concentrations, kinetics, and amount of newly generated APP fragments were calculated. sAPPβ and sAPPα kinetics were similar, but both significantly slower than Aβ. BACE inhibition resulted in decreased labeled sAPPβ and Aβ in CSF, without observable changes in labeled CSF sAPPα. ELISA concentrations of sAPPβ and Aβ both decreased and sAPPα increased. sAPPα increased by ELISA, with no difference by labeled sAPPα kinetics indicating increases in product may be due to APP shunting from the β-secretase to the α-secretase pathway. These results provide a quantitative understanding of pharmacodynamic effects of BACE inhibition on NHP CNS, which can inform about target development.
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23
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Cerebrospinal Fluid Biomarkers in Alzheimer’s Disease and Frontotemporal Dementia. NEURODEGENER DIS 2014. [DOI: 10.1007/978-1-4471-6380-0_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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24
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Biomarker-Driven Therapeutic Management of Alzheimer’s Disease: Establishing the Foundations. Clin Pharmacol Ther 2013; 95:67-77. [DOI: 10.1038/clpt.2013.205] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2013] [Accepted: 09/20/2013] [Indexed: 11/08/2022]
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25
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García-Ayllón MS, Campanari ML, Brinkmalm G, Rábano A, Alom J, Saura CA, Andreasen N, Blennow K, Sáez-Valero J. CSF Presenilin-1 complexes are increased in Alzheimer's disease. Acta Neuropathol Commun 2013; 1:46. [PMID: 24252417 PMCID: PMC3893612 DOI: 10.1186/2051-5960-1-46] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2013] [Accepted: 08/04/2013] [Indexed: 11/24/2022] Open
Abstract
Background Presenilin-1 (PS1) is the active component of the amyloid precursor protein cleaving γ-secretase complex. PS1 protein is a transmembrane protein containing multiple hydrophobic regions which presence in cerebrospinal fluid (CSF) has not been measured to date. This study assesses whether PS1 and other components of the γ-secretase complex are present in CSF. Results Here, we show that PS1 is present in ventricular post-mortem and lumbar ante-mortem CSF, and plasma as 100–150-kDa hetero-complexes containing both the N- and C-terminal fragments (NTF and CTF) of the protein. Immunoprecipitation and immunoblotting with different antibodies confirmed the identity of the PS1 species. The γ-secretase components, APH-1 (anterior pharynx-defective 1) and PEN-2 (presenilin enhancer 2), as well as presenilin-2 (PS2) fragments, co-exist within these CSF complexes, while nicastrin is not detected. These CSF-PS1 complexes differ from active γ-secretase membrane-complexes, and may represent nonspecific aggregation of the PS1 protein. Levels of PS1 complexes are increased in CSF samples from autopsy-confirmed Alzheimer’s disease (AD) cases and were found to be more stable than complexes in CSF from control subjects. Despite similar levels of total PS1 in CSF from probable AD patients and cognitively normal subjects, an increased proportion of highly stable PS1 complexes were observed in AD CSF. Conclusions Our data suggest that fragments of the PS1 protein present in CSF as complexes may be useful as a biomarker for AD.
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Rosén C, Hansson O, Blennow K, Zetterberg H. Fluid biomarkers in Alzheimer's disease - current concepts. Mol Neurodegener 2013; 8:20. [PMID: 23800368 PMCID: PMC3691925 DOI: 10.1186/1750-1326-8-20] [Citation(s) in RCA: 148] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Accepted: 06/18/2013] [Indexed: 11/17/2022] Open
Abstract
The diagnostic guidelines of Alzheimer’s disease (AD) have recently been updated to include brain imaging and cerebrospinal fluid (CSF) biomarkers, with the aim of increasing the certainty of whether a patient has an ongoing AD neuropathologic process or not. The CSF biomarkers total tau (T-tau), hyperphosphorylated tau (P-tau) and the 42 amino acid isoform of amyloid β (Aβ42) reflect the core pathologic features of AD, which are neuronal loss, intracellular neurofibrillary tangles and extracellular senile plaques. Since the pathologic processes of AD start decades before the first symptoms, these biomarkers may provide means of early disease detection. The updated guidelines identify three different stages of AD: preclinical AD, mild cognitive impairment (MCI) due to AD and AD with dementia. In this review, we aim to summarize the CSF biomarker data available for each of these stages. We also review results from blood biomarker studies. In summary, the core AD CSF biomarkers have high diagnostic accuracy both for AD with dementia and to predict incipient AD (MCI due to AD). Longitudinal studies on healthy elderly and recent cross-sectional studies on patients with dominantly inherited AD mutations have also found biomarker changes in cognitively normal at-risk individuals. This will be important if disease-modifying treatment becomes available, given that treatment will probably be most effective early in the disease. An important prerequisite for this is trustworthy analyses. Since measurements vary between studies and laboratories, standardization of analytical as well as pre-analytical procedures will be essential. This process is already initiated. Apart from filling diagnostic roles, biomarkers may also be utilized for prognosis, disease progression, development of new treatments, monitoring treatment effects and for increasing the knowledge about pathologic processes coupled to the disease. Hence, the search for new biomarkers continues. Several candidate biomarkers have been found in CSF, and although biomarkers in blood have been harder to find, some recent studies have presented encouraging results. But before drawing any major conclusions, these results need to be verified in independent studies.
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Affiliation(s)
- Christoffer Rosén
- Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at the University of Gothenburg Mölndal, S-431 80, Mölndal, Sweden.
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Abstract
PURPOSE OF REVIEW To review the rationale behind and the use of cerebrospinal fluid (CSF) biomarkers in Alzheimer's disease (AD). Established as well as new candidate biomarkers will be covered. RECENT FINDINGS AD is a complex disorder and the AD brain is characterized by multiple pathological processes, in addition to well-described plaque and tangle diseases. Recent studies have tried to address this by evaluating biomarkers related to features such as neuroinflammation, oxidative stress, microglial activation and synaptic degeneration, with some positive results. SUMMARY The CSF biomarkers total tau, phosphorylated-tau and the 42 amino acid isoform of amyloid beta reflect core elements of AD, that is, axonal degeneration, tangle disease and senile plaques, have been thoroughly tested and provide high diagnostic accuracy in the discrimination of patients with AD as compared with cognitively normal controls. They are also highly predictive of AD with dementia in patients with mild cognitive impairment, and have been included in new diagnostic criteria. New biomarkers may add to their diagnostic performance. Other potential fields of use include the monitoring of disease progression or pharmacodynamic drug effects. A common denominator for the candidate biomarkers is the need for validation in further studies to clarify their potential.
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28
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Shen Y. From Bench to Bedside. Bioinformatics 2013. [DOI: 10.4018/978-1-4666-3604-0.ch017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Alzheimer’s disease (AD) is a constantly progressive and highly complex neurodegenerative disease, and there are many ways to molecularly characterize the various stages. Morphologically, AD patients are characterized by neurofibrillar abnormalities associated with pathological hyperphosphorylation of tau protein, and deposits of ß– amyloid peptides (Aß). There is an overwhelming amount of information to support the hypothesis that generation, formation, and ß-amyloid deposits play key mechanistic roles in the early development of AD. It is known that the cause of early-onset familial AD (FAD) is due to mutations in three genes which cause an increase in the production of the toxic peptide, Aß42. The molecules that cause the proteolytic activities of beta and gamma secretase, two proteases that free the Aß-peptide by endoproteolyzing APP, have recently been discovered. Homologous to BACE1, BACE2 was also a recent discovery (Lin et al, 2000; Vassar et al, 1999; Yan et al, 1999), and together these two enzymes make up a new family of transmembrane aspartic proteases. The key enzyme, BACE1, initiates the formation of Aß, represents a candidate biomarker, as well as a drug target for AD, exhibit all the functional properties of ß–secretase. This chapter will review the biology of BACE1 and focus attention to BACE1 as a candidate biomarker for the early detection, prediction, and biological activity in AD.
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Affiliation(s)
- Yong Shen
- Center for Advanced Therapeutic Strategies for Brain Disorders, Raskamp Institute, USA
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29
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Hampel H, Lista S, Khachaturian ZS. Development of biomarkers to chart all Alzheimer's disease stages: the royal road to cutting the therapeutic Gordian Knot. Alzheimers Dement 2012; 8:312-36. [PMID: 22748938 DOI: 10.1016/j.jalz.2012.05.2116] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The aim of this perspective article is to stimulate radical shifts in thinking and foster further discussion on the effective discovery, development, validation, and qualification process of biological markers derived from all available technical modalities that meet the complex conceptual and pathophysiological challenges across all stages of the complex, nonlinear, dynamic, and chronically progressive sporadic Alzheimer's disease (AD). This perspective evaluates the current state of the science regarding a broad spectrum of hypothesis-driven and exploratory technologies and "markers" as candidates for all required biomarker functions, in particular, surrogate indicators of adaptive to maladaptive and compensatory to decompensatory, reversible to irreversible brain "systems failure." We stress the future importance of the systems biology (SB) paradigm (next to the neural network paradigm) for substantial progress in AD research. SB represents an integrated and deeper investigation of interacting biomolecules within cells and organisms. This approach has only recently become feasible as high-throughput technologies and mass spectrometric analyses of proteins and lipids, together with rigorous bioinformatics, have evolved. Existing high-content data derived from clinically and experimentally derived neural tissues point to convergent pathophysiological pathways during the course of AD, transcending traditional descriptive studies to reach a more integrated and comprehensive understanding of AD pathophysiology, derived systems biomarkers, and "druggable" system nodes. The discussion is continued on the premise that the lack of integration of advanced biomarker technologies and transfertilization from more mature translational research fields (e.g., oncology, immunology, cardiovascular), which satisfy regulatory requirements for an accurate, sensitive, and well-validated surrogate marker of specific pathophysiological processes and/or clinical outcomes, is a major rate-limiting factor for the successful development and approval of effective treatments for AD prevention. We consider the conceptual, scientific, and technical challenges for the discovery-development-validation-qualification process of biomarker tools and analytical algorithms for detection of the earliest pathophysiological processes in asymptomatic individuals at elevated risk during preclinical stages of AD. The most critical need for rapid translation of putative markers into validated (performance) and standardized (harmonized standard operating procedures) biomarker tools that fulfill regulatory requirements (qualify for use in treatment trials: e.g., safety, target engagement, mechanism of action, enrichment, stratification, secondary and primary outcome, surrogate outcome) is the availability of a large-scale worldwide comprehensive longitudinal database that includes the following cohorts: (a) healthy aging, (b) people at elevated risks (genetic/epigenetic/lifestyle/comorbid conditions), and (c) asymptomatic-preclinical/prodromal-mild cognitive impairment/syndromal mild, moderate, or severe AD. Our proposal, as initial strategic steps for integrating markers into future development of diagnostic and therapy trial technologies, is to work toward: (a) creating the essential research and development infrastructure as an international shared resource, (b) building the organizational structure for managing such a multinational shared resource, and (c) establishing an integrated transsectoral multidisciplinary global network of collaborating investigators to help build and use the shared research resource.
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Affiliation(s)
- Harald Hampel
- Department of Psychiatry, University of Frankfurt, Frankfurt am Main, Germany.
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Holsinger RMD, Goense N, Bohorquez J, Strappe P. Splice variants of the Alzheimer's disease beta-secretase, BACE1. Neurogenetics 2012; 14:1-9. [PMID: 23142975 DOI: 10.1007/s10048-012-0348-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Accepted: 10/15/2012] [Indexed: 10/27/2022]
Abstract
Cleavage of the amyloid precursor protein by enzymes commonly referred to as β- and γ-secretase constitute an important process in the pathogenesis of Alzheimer's disease (AD). The regulation of this process is therefore an important subject of investigation. Numerous sources of endogenous regulation have been identified, and one of these is the relative abundance and regulation of splice variants of the β-secretase, BACE1 (β-site amyloid precursor protein cleaving enzyme 1). In this review, we will briefly discuss the main characteristics of BACE1, review the different variants of this enzyme that have been identified to date, and highlight their possible implication in AD.
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Affiliation(s)
- R M Damian Holsinger
- Laboratory of Molecular Neuroscience, Brain and Mind Research Institute, The University of Sydney, Camperdown, NSW 2050, Australia.
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31
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Abstract
Dementia due to Alzheimer's disease (AD) is estimated to reach epidemic proportions by the year 2030. Given the limited accuracy of current AD clinical diagnosis, biomarkers of AD pathologies are currently being sought. Reductions in cerebrospinal fluid levels of β-amyloid 42 (a marker of amyloid plaques) and elevations in tau species (markers of neurofibrillary tangles and/or neurodegeneration) are well-established as biomarkers useful for AD diagnosis and prognosis. However, novel markers for other features of AD pathophysiology (e.g., β-amyloid processing, neuroinflammation and neuronal stress/dysfunction) and for other non-AD dementias are required to improve the accuracy of AD disease diagnosis, prognosis, staging and therapeutic monitoring (theragnosis). This article discusses the potential of several promising novel cerebrospinal fluid analytes, highlights the next steps critical for advancement in the field, and provides a prediction on how the field may evolve in 5-10 years.
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Affiliation(s)
- Anne M Fagan
- Department of Neurology, Washington University School of Medicine, 660 South Euclid Ave., St Louis, MO 63110, USA.
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Rosén C, Andreasson U, Mattsson N, Marcusson J, Minthon L, Andreasen N, Blennow K, Zetterberg H. Cerebrospinal fluid profiles of amyloid β-related biomarkers in Alzheimer's disease. Neuromolecular Med 2012; 14:65-73. [PMID: 22350541 DOI: 10.1007/s12017-012-8171-4] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Accepted: 02/03/2012] [Indexed: 12/14/2022]
Abstract
The amyloid cascade hypothesis on the pathogenesis of Alzheimer's disease (AD) states that amyloid β (Aβ) accumulation in the brain is a key factor that initiates the neurodegenerative process. Aβ is generated from amyloid precursor protein (APP) through sequential cleavages by BACE1 (the major β-secretase in the brain) and γ-secretase. The purpose of this study was to characterize APP metabolism in vivo in AD patients versus cognitively healthy subjects by examining alterations in cerebrospinal fluid (CSF) biomarkers. We measured BACE1 activity and concentrations of α- and β-cleaved soluble APP (sAPPα and sAPPβ, respectively) and Aβ40 in CSF, biomarkers that all reflect the metabolism of APP, in 75 AD patients and 65 cognitively healthy controls. These analytes were also applied in a multivariate model to determine whether they provided any added diagnostic value to the core CSF AD biomarkers Aβ42, T-tau, and P-tau. We found no significant differences in BACE1 activity or sAPPα, sAPPβ, and Aβ40 concentrations between AD patients and controls. A multivariate model created with all analytes did not improve the separation of AD patients from controls compared with using the core AD biomarkers alone, highlighting the strong diagnostic performance of Aβ42, T-tau, and P-tau for AD. However, AD patients in advanced clinical stage, as determined by low MMSE score (≤20), had lower BACE1 activity and sAPPα, sAPPβ, and Aβ40 concentrations than patients with higher MMSE score, suggesting that these markers may be related to the severity of the disease.
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Affiliation(s)
- Christoffer Rosén
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden
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Mattsson N, Rajendran L, Zetterberg H, Gustavsson M, Andreasson U, Olsson M, Brinkmalm G, Lundkvist J, Jacobson LH, Perrot L, Neumann U, Borghys H, Mercken M, Dhuyvetter D, Jeppsson F, Blennow K, Portelius E. BACE1 inhibition induces a specific cerebrospinal fluid β-amyloid pattern that identifies drug effects in the central nervous system. PLoS One 2012; 7:e31084. [PMID: 22328928 PMCID: PMC3273469 DOI: 10.1371/journal.pone.0031084] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2011] [Accepted: 01/01/2012] [Indexed: 12/17/2022] Open
Abstract
BACE1 is a key enzyme for amyloid-β (Aβ) production, and an attractive therapeutic target in Alzheimer's disease (AD). Here we report that BACE1 inhibitors have distinct effects on neuronal Aβ metabolism, inducing a unique pattern of secreted Aβ peptides, analyzed in cell media from amyloid precursor protein (APP) transfected cells and in cerebrospinal fluid (CSF) from dogs by immunoprecipitation-mass spectrometry, using several different BACE1 inhibitors. Besides the expected reductions in Aβ1-40 and Aβ1-42, treatment also changed the relative levels of several other Aβ isoforms. In particular Aβ1-34 decreased, while Aβ5-40 increased, and these changes were more sensitive to BACE1 inhibition than the changes in Aβ1-40 and Aβ1-42. The effects on Aβ5-40 indicate the presence of a BACE1 independent pathway of APP degradation. The described CSF Aβ pattern may be used as a pharmacodynamic fingerprint to detect biochemical effects of BACE1-therapies in clinical trials, which might accelerate development of novel therapies.
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Affiliation(s)
- Niklas Mattsson
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Lawrence Rajendran
- Systems and Cell Biology of Neurodegeneration, Division of Psychiatry Research, University of Zurich, Zurich, Switzerland
| | - Henrik Zetterberg
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Mikael Gustavsson
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Ulf Andreasson
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Maria Olsson
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Gunnar Brinkmalm
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Johan Lundkvist
- Innovative Medicines, Central Nervous System and Pain iMed, Department of Neuroscience, AstraZeneca R&D, Södertälje, Sweden
| | - Laura H. Jacobson
- Neuroscience Discovery, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Ludovic Perrot
- Neuroscience Discovery, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Ulf Neumann
- Neuroscience Discovery, Novartis Institutes for BioMedical Research, Basel, Switzerland
| | - Herman Borghys
- Neuroscience Therapeutic Area, Janssen Research and Development, Beerse, Belgium
| | - Marc Mercken
- Neuroscience Therapeutic Area, Janssen Research and Development, Beerse, Belgium
| | - Deborah Dhuyvetter
- Neuroscience Therapeutic Area, Janssen Research and Development, Beerse, Belgium
| | - Fredrik Jeppsson
- Innovative Medicines, Central Nervous System and Pain iMed, Department of Neuroscience, AstraZeneca R&D, Södertälje, Sweden
| | - Kaj Blennow
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
| | - Erik Portelius
- Clinical Neurochemistry Laboratory, Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy, University of Gothenburg, Mölndal, Sweden
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Decourt B, Sabbagh MN. BACE1 as a potential biomarker for Alzheimer's disease. J Alzheimers Dis 2011; 24 Suppl 2:53-9. [PMID: 21403391 DOI: 10.3233/jad-2011-110017] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The diagnosis of Alzheimer's disease (AD) relies principally on clinical criteria for probable and possible AD as defined by the NINCDS-ADRDRA. The field is desperately lacking of biological markers to assist with AD diagnosis and verification of treatment efficacy. According to the Consensus Report of the Working Group on Molecular and Biochemical Markers of Alzheimer's Disease, in order to qualify as a biomarker the sample in question must adhere to certain basic requirements, including the ability to: reflect AD pathology and differentiate it from other dementia with an 80% sensitivity; be reliable and reproducible; be easy to perform and analyze; remain relatively inexpensive. Beta secretases are crucial enzymes in the pathogenesis of AD. Given its primary role in brain amyloidogenesis and its ubiquitous expression, one may consider measuring peripheral BACE1 levels and activity as biomarkers of AD, like performed in the brain and cerebrospinal fluid. However, very little is known about the periphery and whether peripheral BACE1 is involved in AD pathogenesis or mirrors AD progression. Moreover, no investigation has focused on the possibility of monitoring peripheral BACE1 to assess the efficiency of BACE1 inhibitors during the course of clinical trials. Part of the problem may be attributed to the lack of sensitive molecular tools which are absolutely necessary to use BACE1 as a biomarker. In this review we evaluate the progress and feasibility of developing BACE1 as a biomarker for AD in different tissues.
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Affiliation(s)
- Boris Decourt
- Banner Sun Health Research Institute, Haldeman Laboratory of Molecular Diagnostics and Therapeutics, Sun City, AZ 85351, USA.
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Gonzales A, Decourt B, Walker A, Condjella R, Nural H, Sabbagh MN. Development of a specific ELISA to measure BACE1 levels in human tissues. J Neurosci Methods 2011; 202:70-6. [PMID: 21889954 DOI: 10.1016/j.jneumeth.2011.08.030] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Revised: 08/12/2011] [Accepted: 08/17/2011] [Indexed: 11/26/2022]
Abstract
The aspartyl protease BACE1 is the rate limiting enzyme in the synthesis of amyloid beta, which accumulation in the human brain is a hallmark of Alzheimer's disease (AD). BACE1 has been proposed as a surrogate marker of AD; however, very few BACE1 immunoassays have been reported. In the present study we have screened ten BACE1 antibodies by Western blot and several antibody pairs to develop a new BACE1 sandwich ELISA procedure. We identified one pair that showed little background and good reproducibility. Several dilution buffers and sample denaturation methods were tried to partially unfold BACE1 before capture. We found that dilution in PBS followed by 10 min incubation at 50°C critically improves the performance of the assay. Finally, we successfully measured BACE1 levels in a few human brain and platelet lysates as well as in plasma and AD CSF. We anticipate that this assay will lay the ground to accurately measure BACE1 levels in human tissues, which could facilitate the molecular diagnosis of AD in the near future.
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Affiliation(s)
- Amanda Gonzales
- Banner Sun Health Research Institute, Haldeman Laboratory of Molecular Diagnostics and Therapeutics, 10515 Santa Fe Drive, Sun City, AZ 85351, USA.
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Cole SL, Vassar R. The Basic Biology of BACE1: A Key Therapeutic Target for Alzheimer's Disease. Curr Genomics 2011; 8:509-30. [PMID: 19415126 PMCID: PMC2647160 DOI: 10.2174/138920207783769512] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2007] [Revised: 12/27/2007] [Accepted: 12/27/2007] [Indexed: 11/22/2022] Open
Abstract
Alzheimer’s disease (AD) is an intractable, neurodegenerative disease that appears to be brought about by both genetic and non-genetic factors. The neuropathology associated with AD is complex, although amyloid plaques composed of the β-amyloid peptide (Aβ) are hallmark neuropathological lesions of AD brain. Indeed, Aβ plays an early and central role in this disease. β-site amyloid precursor protein (APP) cleaving enzyme 1 (BACE1) is the initiating enzyme in Aβ genesis and BACE1 levels are elevated under a variety of conditions. Given the strong correlation between Aβ and AD, and the elevation of BACE1 in this disease, this enzyme is a prime drug target for inhibiting Aβ production in AD. However, nine years on from the initial identification of BACE1, and despite intense research, a number of key questions regarding BACE1 remain unanswered. Indeed, drug discovery and development for AD continues to be challenging. While current AD therapies temporarily slow cognitive decline, treatments that address the underlying pathologic mechanisms of AD are completely lacking. Here we review the basic biology of BACE1. We pay special attention to recent research that has provided some answers to questions such as those involving the identification of novel BACE1 substrates, the potential causes of BACE1 elevation and the putative function of BACE1 in health and disease. Our increasing understanding of BACE1 biology should aid the development of compounds that interfere with BACE1 expression and activity and may lead to the generation of novel therapeutics for AD.
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Affiliation(s)
- S L Cole
- Department of Cell and Molecular Biology, Feinberg School of Medicine, Northwestern University, 303 E. Chicago Avenue, Chicago, IL 60611, USA
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37
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Butler D, Hwang J, Estick C, Nishiyama A, Kumar SS, Baveghems C, Young-Oxendine HB, Wisniewski ML, Charalambides A, Bahr BA. Protective effects of positive lysosomal modulation in Alzheimer's disease transgenic mouse models. PLoS One 2011; 6:e20501. [PMID: 21695208 PMCID: PMC3112200 DOI: 10.1371/journal.pone.0020501] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Accepted: 05/03/2011] [Indexed: 12/23/2022] Open
Abstract
Alzheimer's disease (AD) is an age-related neurodegenerative pathology in which defects in proteolytic clearance of amyloid β peptide (Aβ) likely contribute to the progressive nature of the disorder. Lysosomal proteases of the cathepsin family exhibit up-regulation in response to accumulating proteins including Aβ1–42. Here, the lysosomal modulator Z-Phe-Ala-diazomethylketone (PADK) was used to test whether proteolytic activity can be enhanced to reduce the accumulation events in AD mouse models expressing different levels of Aβ pathology. Systemic PADK injections in APPSwInd and APPswe/PS1ΔE9 mice caused 3- to 8-fold increases in cathepsin B protein levels and 3- to 10-fold increases in the enzyme's activity in lysosomal fractions, while neprilysin and insulin-degrading enzyme remained unchanged. Biochemical analyses indicated the modulation predominantly targeted the active mature forms of cathepsin B and markedly changed Rab proteins but not LAMP1, suggesting the involvement of enhanced trafficking. The modulated lysosomal system led to reductions in both Aβ immunostaining as well as Aβx-42 sandwich ELISA measures in APPSwInd mice of 10–11 months. More extensive Aβ deposition in 20-22-month APPswe/PS1ΔE9 mice was also reduced by PADK. Selective ELISAs found that a corresponding production of the less pathogenic Aβ1–38 occurs as Aβ1–42 levels decrease in the mouse models, indicating that PADK treatment leads to Aβ truncation. Associated with Aβ clearance was the elimination of behavioral and synaptic protein deficits evident in the two transgenic models. These findings indicate that pharmacologically-controlled lysosomal modulation reduces Aβ1–42 accumulation, possibly through intracellular truncation that also influences extracellular deposition, and in turn offsets the defects in synaptic composition and cognitive functions. The selective modulation promotes clearance at different levels of Aβ pathology and provides proof-of-principle for small molecule therapeutic development for AD and possibly other protein accumulation disorders.
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Affiliation(s)
- David Butler
- Neurosciences Program, University of Connecticut, Storrs, Connecticut, United States of America
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut, United States of America
| | - Jeannie Hwang
- Neurosciences Program, University of Connecticut, Storrs, Connecticut, United States of America
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut, United States of America
- William C. Friday Laboratory, Biotechnology Research and Training Center, University of North Carolina Pembroke, Pembroke, North Carolina, United States of America
| | - Candice Estick
- Neurosciences Program, University of Connecticut, Storrs, Connecticut, United States of America
- Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut, United States of America
| | - Akiko Nishiyama
- Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut, United States of America
| | - Saranya Santhosh Kumar
- Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut, United States of America
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut, United States of America
| | - Clive Baveghems
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut, United States of America
| | - Hollie B. Young-Oxendine
- William C. Friday Laboratory, Biotechnology Research and Training Center, University of North Carolina Pembroke, Pembroke, North Carolina, United States of America
| | - Meagan L. Wisniewski
- William C. Friday Laboratory, Biotechnology Research and Training Center, University of North Carolina Pembroke, Pembroke, North Carolina, United States of America
| | - Ana Charalambides
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut, United States of America
- William C. Friday Laboratory, Biotechnology Research and Training Center, University of North Carolina Pembroke, Pembroke, North Carolina, United States of America
| | - Ben A. Bahr
- Neurosciences Program, University of Connecticut, Storrs, Connecticut, United States of America
- Department of Pharmaceutical Sciences, University of Connecticut, Storrs, Connecticut, United States of America
- William C. Friday Laboratory, Biotechnology Research and Training Center, University of North Carolina Pembroke, Pembroke, North Carolina, United States of America
- Department of Physiology and Neurobiology, University of Connecticut, Storrs, Connecticut, United States of America
- Department of Molecular and Cell Biology, University of Connecticut, Storrs, Connecticut, United States of America
- * E-mail:
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Olsson B, Zetterberg H, Hampel H, Blennow K. Biomarker-based dissection of neurodegenerative diseases. Prog Neurobiol 2011; 95:520-34. [PMID: 21524681 DOI: 10.1016/j.pneurobio.2011.04.006] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2010] [Revised: 04/06/2011] [Accepted: 04/10/2011] [Indexed: 12/12/2022]
Abstract
The diagnosis of neurodegenerative diseases within neurology and psychiatry are hampered by the difficulty in getting biopsies and thereby validating the diagnosis by pathological findings. Biomarkers for other types of disease have been readily adopted into the clinical practice where for instance troponins are standard tests when myocardial infarction is suspected. However, the use of biomarkers for neurodegeneration has not been fully incorporated into the clinical routine. With the development of cerebrospinal fluid (CSF) biomarkers that reflect pathological events within the central nervous system (CNS), important clinical diagnostic tools are becoming available. This review summarizes the most promising biomarker candidates that may be used to monitor different types of neurodegeneration and protein inclusions, as well as different types of metabolic changes, in living patients in relation to the clinical phenotype and disease progression over time. Our aim is to provide the reader with an updated lexicon on currently available biomarker candidates, how far they have come in development and how well they reflect pathogenic processes in different neurodegenerative diseases. Biomarkers for specific pathogenetic processes would also be valuable tools both to study disease pathogenesis directly in patients and to identify and monitor the effect of novel treatment strategies.
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Affiliation(s)
- Bob Olsson
- Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, Sahlgrenska Academy at University of Gothenburg, S-431 80 Mölndal, Sweden.
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Wu G, Sankaranarayanan S, Hsieh SHK, Simon AJ, Savage MJ. Decrease in brain soluble amyloid precursor protein β (sAPPβ) in Alzheimer's disease cortex. J Neurosci Res 2011; 89:822-32. [PMID: 21433051 DOI: 10.1002/jnr.22618] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2010] [Revised: 12/23/2010] [Accepted: 01/11/2011] [Indexed: 11/10/2022]
Abstract
Amyloid-β peptide (Aβ) is generated by sequential cleavage of the amyloid precursor protein (APP) by β-site amyloid precursor protein cleaving enzyme 1 (β-secretase, or BACE1) and γ-secretase. Several reports demonstrate increased BACE1 enzymatic activity in brain and cerebrospinal fluid (CSF) from Alzheimer's disease (AD) subjects, suggesting that an increase in BACE1-mediated cleavage of APP drives amyloid pathophysiology in AD. BACE1 cleavage of APP leads to the generation of a secreted N-terminal fragment of APP (sAPPβ). To relate BACE1 activity better to endogenous APP processing in AD and control brains, we have directly measured brain sAPPβ levels using a novel APP β-site specific enzyme-linked immunosorbent assay. We demonstrate a significant reduction in brain cortical sAPPβ levels in AD compared with control subjects. In the same brain samples, BACE1 activity was unchanged, full-length APP and sAPPα levels were significantly reduced, and Aβ peptides were significantly elevated. In conclusion, a reduction in cortical brain sAPPβ together with unchanged BACE1 activity suggests that this is due to reduced full-length APP substrate in late-stage AD subjects. These results highlight the need for multiparameter analysis of the amyloidogenic process to understand better AD pathophysiology in early vs. late-stage AD.
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Affiliation(s)
- Guoxin Wu
- Department of Neurology, Merck Research Laboratory, West Point, Pennsylvania.
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Hampel H, Frank R, Broich K, Teipel SJ, Katz RG, Hardy J, Herholz K, Bokde ALW, Jessen F, Hoessler YC, Sanhai WR, Zetterberg H, Woodcock J, Blennow K. Biomarkers for Alzheimer's disease: academic, industry and regulatory perspectives. Nat Rev Drug Discov 2010; 9:560-74. [PMID: 20592748 DOI: 10.1038/nrd3115] [Citation(s) in RCA: 479] [Impact Index Per Article: 34.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Advances in therapeutic strategies for Alzheimer's disease that lead to even small delays in onset and progression of the condition would significantly reduce the global burden of the disease. To effectively test compounds for Alzheimer's disease and bring therapy to individuals as early as possible there is an urgent need for collaboration between academic institutions, industry and regulatory organizations for the establishment of standards and networks for the identification and qualification of biological marker candidates. Biomarkers are needed to monitor drug safety, to identify individuals who are most likely to respond to specific treatments, to stratify presymptomatic patients and to quantify the benefits of treatments. Biomarkers that achieve these characteristics should enable objective business decisions in portfolio management and facilitate regulatory approval of new therapies.
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Affiliation(s)
- Harald Hampel
- Department of Psychiatry, Psychosomatic Medicine and Psychotherapy, Johann Wolfgang Goethe-University, Heinrich-Hoffmann-Str. 10, 60528 Frankfurt/Main, Germany.
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41
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Andreasson U, Portelius E, Andersson ME, Blennow K, Zetterberg H. Aspects of beta-amyloid as a biomarker for Alzheimer's disease. Biomark Med 2010; 1:59-78. [PMID: 20477461 DOI: 10.2217/17520363.1.1.59] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Alzheimer's disease is an age-related neurodegenerative disorder that results in progressive cognitive impairment and death. The accumulation of beta-amyloid (Abeta) in specific brain regions is believed by many to represent the earliest event in the pathogenesis of the disease. Here, we review the key aspects of Abeta as a biomarker for Alzheimer's disease, including the pathogenicity of Abeta, the possible biological functions of its precursor protein, the Abeta metabolism and homeostasis, the diagnostic performance of different Abeta assays in different settings and the potential usefulness of Abeta as a surrogate marker for treatment efficacy in clinical trials of novel Abeta-targeting drugs against Alzheimer's disease.
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Affiliation(s)
- Ulf Andreasson
- Sahlgrenska University Hospital/Mölndal, Clinical Neurochemistry Laboratory/Mölndal, S-431 80, Göteborg University, Mölndal, Sweden
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Hampel H, Shen Y, Walsh DM, Aisen P, Shaw LM, Zetterberg H, Trojanowski JQ, Blennow K. Biological markers of amyloid beta-related mechanisms in Alzheimer's disease. Exp Neurol 2009; 223:334-46. [PMID: 19815015 DOI: 10.1016/j.expneurol.2009.09.024] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2009] [Revised: 09/21/2009] [Accepted: 09/26/2009] [Indexed: 12/15/2022]
Abstract
Recent research progress has given detailed knowledge on the molecular pathogenesis of Alzheimer's disease (AD), which has been translated into an intense, ongoing development of disease-modifying treatments. Most new drug candidates are targeted on inhibiting amyloid beta (Abeta) production and aggregation. In drug development, it is important to co-develop biomarkers for Abeta-related mechanisms to enable early diagnosis and patient stratification in clinical trials, and to serve as tools to identify and monitor the biochemical effect of the drug directly in patients. Biomarkers are also requested by regulatory authorities to serve as safety measurements. Molecular aberrations in the AD brain are reflected in the cerebrospinal fluid (CSF). Core CSF biomarkers include Abeta isoforms (Abeta40/Abeta42), soluble APP isoforms, Abeta oligomers and beta-site APP-cleaving enzyme 1 (BACE1). This article reviews recent research advances on core candidate CSF and plasma Abeta-related biomarkers, and gives a conceptual review on how to implement biomarkers in clinical trials in AD.
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Affiliation(s)
- Harald Hampel
- Discipline of Psychiatry, School of Medicine and Trinity College Institute of Neuroscience (TCIN), Laboratory of Neuroimaging and Biomarker Research, Trinity College Dublin, Trinity Centre for Health Sciences, The Adelaide and Meath Hospital Incorporating The National Children's Hospital (AMiNCH), Dublin, Ireland
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Hampel H, Shen Y. Beta‐site amyloid precursor protein cleaving enzyme 1 (BACE1) as a biological candidate marker of Alzheimer's disease. Scandinavian Journal of Clinical and Laboratory Investigation 2009; 69:8-12. [DOI: 10.1080/00365510701864610] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Taylor DR, Parkin ET, Cocklin SL, Ault JR, Ashcroft AE, Turner AJ, Hooper NM. Role of ADAMs in the ectodomain shedding and conformational conversion of the prion protein. J Biol Chem 2009; 284:22590-600. [PMID: 19564338 PMCID: PMC2755666 DOI: 10.1074/jbc.m109.032599] [Citation(s) in RCA: 106] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
The cellular prion protein (PrPC) is essential for the pathogenesis and transmission of prion diseases. PrPC is bound to the plasma membrane via a glycosylphosphatidylinositol anchor, although a secreted, soluble form has also been identified. Previously we reported that PrPC is subject to ectodomain shedding from the membrane by zinc metalloproteinases with a similar inhibition profile to those involved in shedding the amyloid precursor protein. Here we have used gain-of-function (overexpression) and loss-of-function (small interfering RNA knockdown) experiments in cells to identify the ADAMs (adisintegrin and metalloproteinases) involved in the ectodomain shedding of PrPC. These experiments revealed that ADAM9 and ADAM10, but not ADAM17, are involved in the shedding of PrPC and that ADAM9 exerts its effect on PrPC shedding via ADAM10. Using dominant negative, catalytically inactive mutants, we show that the catalytic activity of ADAM9 is required for its effect on ADAM10. Mass spectrometric analysis revealed that ADAM10, but not ADAM9, cleaved PrP between Gly228 and Arg229, three residues away from the site of glycosylphosphatidylinositol anchor attachment. The shedding of another membrane protein, the amyloid precursor protein β-secretase BACE1, by ADAM9 is also mediated via ADAM10. Furthermore, we show that pharmacological inhibition of PrPC shedding or activation of both PrPC and PrPSc shedding by ADAM10 overexpression in scrapie-infected neuroblastoma N2a cells does not alter the formation of proteinase K-resistant PrPSc. Collectively, these data indicate that although PrPC can be shed through the action of ADAM family members, modulation of PrPC or PrPSc ectodomain shedding does not regulate prion conversion.
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Affiliation(s)
- David R Taylor
- Proteolysis Research Group, Institute of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom
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Zetterberg H. Update on amyloid-beta homeostasis markers for sporadic Alzheimer's disease. Scandinavian Journal of Clinical and Laboratory Investigation 2009; 69:18-21. [PMID: 19199126 DOI: 10.1080/00365510802651841] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Amyloid-beta (Abeta) is either directly involved in the pathogenesis of Alzheimer's disease (AD) or tightly correlated with other primary pathogenic factors. It is produced from amyloid precursor protein (APP) by proteolytic processing dependent on the beta-site APP-cleaving enzyme 1 (BACE1) and gamma-secretase, and is degraded by a broad range of proteases. This update summarizes the currently available studies that have determined the usefulness of BACE1 and secreted fragments of APP and Abeta as cerebrospinal fluid biomarkers for AD.
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Affiliation(s)
- Henrik Zetterberg
- Institute of Neuroscience and Physiology, Department of Psychiatry and Neurochemistry, Sahlgrenska Academy at Goteborg University, Molndal, Sweden.
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Wu G, Sankaranarayanan S, Tugusheva K, Kahana J, Seabrook G, Shi XP, King E, Devanarayan V, Cook JJ, Simon AJ. Decrease in age-adjusted cerebrospinal fluid β-secretase activity in Alzheimer's subjects. Clin Biochem 2008; 41:986-96. [DOI: 10.1016/j.clinbiochem.2008.04.022] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2007] [Revised: 03/12/2008] [Accepted: 04/20/2008] [Indexed: 12/30/2022]
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Abstract
Understanding of the pathophysiological basis of Alzheimer's disease (AD) is increasing rapidly and a variety of potential treatment modalities have emerged based on these improved mechanistic insights. The optimal way of proceeding with disease-modifying drug development remains to be clarified and controversies have emerged regarding the definition of Alzheimer's disease, the participation of mild cognitive impairment patients in clinical trials, the definition of disease modification, the potential impediments to satisfaction from patients receiving disease-modifying therapy, the importance of add-on therapy with symptomatic agents, the optimal clinical trial design to demonstrate disease modification, the best means of minimizing time spent in Phase II of drug development, the potential role of adaptive designs in clinical trials, the use of enrichment designs in clinical trials, the role of biomarkers in clinical trials, the treatment of advanced patients with disease-modifying agents, and distinctions between disease modification and disease prevention. The questions surrounding these issues must be resolved as disease-modifying therapies for AD are advanced. These controversies are framed and potential directions towards resolution described.
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Affiliation(s)
- Jeffrey L. Cummings
- Departments of Neurology and Psychiatry, and Biobehavioral Sciences, David Geffen School of Medicine at UCLA, Los Angeles, CA
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Cole SL, Vassar R. The Alzheimer's disease beta-secretase enzyme, BACE1. Mol Neurodegener 2007; 2:22. [PMID: 18005427 PMCID: PMC2211305 DOI: 10.1186/1750-1326-2-22] [Citation(s) in RCA: 352] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2007] [Accepted: 11/15/2007] [Indexed: 12/11/2022] Open
Abstract
The pathogenesis of Alzheimer's disease is highly complex. While several pathologies characterize this disease, amyloid plaques, composed of the β-amyloid peptide are hallmark neuropathological lesions in Alzheimer's disease brain. Indeed, a wealth of evidence suggests that β-amyloid is central to the pathophysiology of AD and is likely to play an early role in this intractable neurodegenerative disorder. The BACE1 enzyme is essential for the generation of β-amyloid. BACE1 knockout mice do not produce β-amyloid and are free from Alzheimer's associated pathologies including neuronal loss and certain memory deficits. The fact that BACE1 initiates the formation of β-amyloid, and the observation that BACE1 levels are elevated in this disease provide direct and compelling reasons to develop therapies directed at BACE1 inhibition thus reducing β-amyloid and its associated toxicities. However, new data indicates that complete abolishment of BACE1 may be associated with specific behavioral and physiological alterations. Recently a number of non-APP BACE1 substrates have been identified. It is plausible that failure to process certain BACE1 substrates may underlie some of the reported abnormalities in the BACE1-deficient mice. Here we review BACE1 biology, covering aspects ranging from the initial identification and characterization of this enzyme to recent data detailing the apparent dysregulation of BACE1 in Alzheimer's disease. We pay special attention to the putative function of BACE1 during healthy conditions and discuss in detail the relationship that exists between key risk factors for AD, such as vascular disease (and downstream cellular consequences), and the pathogenic alterations in BACE1 that are observed in the diseased state.
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Affiliation(s)
- Sarah L Cole
- Department of Cell and Molecular Biology, The Feinberg School of Medicine, Northwestern University, Chicago Avenue, Chicago, IL, USA.
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