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Soto-Mercado V, Mendivil-Perez M, Velez-Pardo C, Jimenez-Del-Rio M. (-)-Epigallocatechin-3-Gallate Diminishes Intra-and Extracellular Amyloid-Induced Cytotoxic Effects on Cholinergic-like Neurons from Familial Alzheimer's Disease PSEN1 E280A. Biomolecules 2021; 11:biom11121845. [PMID: 34944489 PMCID: PMC8699501 DOI: 10.3390/biom11121845] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 11/26/2021] [Accepted: 11/26/2021] [Indexed: 12/26/2022] Open
Abstract
Alzheimer’s disease (AD) is a complex neurodegenerative disease characterized by functional disruption, death of cholinergic neurons (ChNs) because of intracellular and extracellular Aβ aggregates, and hyperphosphorylation of protein TAU (p-TAU). To date, there are no efficient therapies against AD. Therefore, new therapies for its treatment are in need. The goal of this investigation was to evaluate the effect of the polyphenol epigallocatechin-3-gallate (EGCG) on cholinergic-like neurons (ChLNs) bearing the mutation E280A in PRESENILIN 1 (PSEN1 E280A). To this aim, wild-type (WT) and PSEN1 E280A ChLNs were exposed to EGCG (5–50 μM) for 4 days. Untreated or treated neurons were assessed for biochemical and functional analysis. We found that EGCG (50 μM) significantly inhibited the aggregation of (i)sAPPβf, blocked p-TAU, increased ∆Ψm, decreased oxidation of DJ-1 at residue Cys106-SH, and inhibited the activation of transcription factor c-JUN and P53, PUMA, and CASPASE-3 in mutant ChLNs compared to WT. Although EGCG did not reduce (e)Aβ42, the polyphenol reversed Ca2+ influx dysregulation as a response to acetylcholine (ACh) stimuli in PSEN1 E280A ChLNs, inhibited the activation of transcription factor NF-κB, and reduced the secretion of pro-inflammatory IL-6 in wild-type astrocyte-like cells (ALCs) when exposed to mutant ChLNs culture supernatant. Taken together, our findings suggest that the EGCG might be a promising therapeutic approach for the treatment of FAD.
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Zhen Y, Chen L, Ma X, Ding G, Zhang D, Chen Q. β-Amyloid Peptide 1-42-Conjugated Magnetic Nanoparticles for the Isolation and Purification of Glycoproteins in Egg White. ACS APPLIED MATERIALS & INTERFACES 2021; 13:14028-14036. [PMID: 33730480 DOI: 10.1021/acsami.1c02356] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Aβ1-42-conjugated magnetic nanoparticles, Aβ1-42@MNP, were prepared by covalently coupling Aβ1-42 to hyperbranched polyethyleneimine (PEI)-modified magnetic nanoparticles via N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide hydrochloride (EDC). Aβ1-42's high binding capacity to glycosyl groups facilitates Aβ1-42@MNP composite to be a promising selective adsorbent for glycoproteins in egg whites. In our study, under conditions of pH 4.0, the adsorption efficiency of Aβ1-42@MNP composite for ovalbumin (100 μg mL-1) was 98.4% and its maximum adsorption capacity was 344.8 mg g -1; under the condition of pH 4.0 and 200 mmol L-1 NaCl, its adsorption efficiencies for ovalbumin and ovotransferrin were 96.9% and 60.0%, respectively. According to these primary data, in practice, ovalbumin was removed from egg white by Aβ1-42@MNP composite at pH 4.0 (step I), and then after adding NaCl until the final salt concentration reached 200 mmol L-1 (pretreated egg white), we utilized the same adsorbent to further isolate/purify glycoproteins (step II). SDS-PAGE results showed that Aβ1-42@MNP composite could largely remove ovalbumin in step I and could isolate/purify the remaining ovalbumin and ovotransferrin in step II. LC-MS/MS analysis results showed that the removal of ovalbumin reduced its percentage in egg white samples from 32.93% to 11.05% in step I and the remaining ovalbumin and ovotransferrin were enriched in step II, where the final percentage reached 11.6% and 12.6%, respectively. In summary, 81 protein species were identified after two-step extraction with Aβ1-42@MNP on egg white, while only 46 protein species were identified directly from raw egg white without any pretreatment. This work well illustrates the excellent adsorption performance of Aβ1-42@MNP composite to glycoproteins and its potential in the application of proteomic studies on low-abundance proteins in egg white.
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Affiliation(s)
- Yi Zhen
- Institute of Translational Medicine, Department of Pharmacy, Shenyang Medical College, Shenyang 110034, China
| | - Lei Chen
- Institute of Translational Medicine, Department of Pharmacy, Shenyang Medical College, Shenyang 110034, China
| | - Xiaoyi Ma
- Institute of Translational Medicine, Department of Pharmacy, Shenyang Medical College, Shenyang 110034, China
| | - Guoyu Ding
- Institute of Translational Medicine, Department of Pharmacy, Shenyang Medical College, Shenyang 110034, China
| | - Dandan Zhang
- Institute of Translational Medicine, Department of Pharmacy, Shenyang Medical College, Shenyang 110034, China
| | - Qing Chen
- Institute of Translational Medicine, Department of Pharmacy, Shenyang Medical College, Shenyang 110034, China
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De Mena L, Smith MA, Martin J, Dunton KL, Ceballos-Diaz C, Jansen-West KR, Cruz PE, Dillon KD, Rincon-Limas DE, Golde TE, Moore BD, Levites Y. Aß40 displays amyloidogenic properties in the non-transgenic mouse brain but does not exacerbate Aß42 toxicity in Drosophila. Alzheimers Res Ther 2020; 12:132. [PMID: 33069251 PMCID: PMC7568834 DOI: 10.1186/s13195-020-00698-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 09/29/2020] [Indexed: 11/17/2022]
Abstract
BACKGROUND Self-assembly of the amyloid-β (Aβ) peptide into aggregates, from small oligomers to amyloid fibrils, is fundamentally linked with Alzheimer's disease (AD). However, it is clear that not all forms of Aβ are equally harmful and that linking a specific aggregate to toxicity also depends on the assays and model systems used (Haass et al., J Biol. Chem 269:17741-17748, 1994; Borchelt et al., Neuron 17:1005-1013, 1996). Though a central postulate of the amyloid cascade hypothesis, there remain many gaps in our understanding regarding the links between Aβ deposition and neurodegeneration. METHODS In this study, we examined familial mutations of Aβ that increase aggregation and oligomerization, E22G and ΔE22, and induce cerebral amyloid angiopathy, E22Q and D23N. We also investigated synthetic mutations that stabilize dimerization, S26C, and a phospho-mimetic, S8E, and non-phospho-mimetic, S8A. To that end, we utilized BRI2-Aβ fusion technology and rAAV2/1-based somatic brain transgenesis in mice to selectively express individual mutant Aβ species in vivo. In parallel, we generated PhiC31-based transgenic Drosophila melanogaster expressing wild-type (WT) and Aβ40 and Aβ42 mutants, fused to the Argos signal peptide to assess the extent of Aβ42-induced toxicity as well as to interrogate the combined effect of different Aβ40 and Aβ42 species. RESULTS When expressed in the mouse brain for 6 months, Aβ42 E22G, Aβ42 E22Q/D23N, and Aβ42WT formed amyloid aggregates consisting of some diffuse material as well as cored plaques, whereas other mutants formed predominantly diffuse amyloid deposits. Moreover, while Aβ40WT showed no distinctive phenotype, Aβ40 E22G and E22Q/D23N formed unique aggregates that accumulated in mouse brains. This is the first evidence that mutant Aβ40 overexpression leads to deposition under certain conditions. Interestingly, we found that mutant Aβ42 E22G, E22Q, and S26C, but not Aβ40, were toxic to the eye of Drosophila. In contrast, flies expressing a copy of Aβ40 (WT or mutants), in addition to Aβ42WT, showed improved phenotypes, suggesting possible protective qualities for Aβ40. CONCLUSIONS These studies suggest that while some Aβ40 mutants form unique amyloid aggregates in mouse brains, they do not exacerbate Aβ42 toxicity in Drosophila, which highlights the significance of using different systems for a better understanding of AD pathogenicity and more accurate screening for new potential therapies.
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Affiliation(s)
- Lorena De Mena
- Department of Neurology, McKnight Brain Institute, University of Florida and Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA
- Center for Translational Research in Neurodegenerative Disease and Department of Neuroscience, Gainesville, FL, USA
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Michael A Smith
- Center for Translational Research in Neurodegenerative Disease and Department of Neuroscience, Gainesville, FL, USA
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Jason Martin
- Center for Translational Research in Neurodegenerative Disease and Department of Neuroscience, Gainesville, FL, USA
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Katie L Dunton
- Center for Translational Research in Neurodegenerative Disease and Department of Neuroscience, Gainesville, FL, USA
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Carolina Ceballos-Diaz
- Center for Translational Research in Neurodegenerative Disease and Department of Neuroscience, Gainesville, FL, USA
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA
| | | | - Pedro E Cruz
- Center for Translational Research in Neurodegenerative Disease and Department of Neuroscience, Gainesville, FL, USA
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Kristy D Dillon
- Center for Translational Research in Neurodegenerative Disease and Department of Neuroscience, Gainesville, FL, USA
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Diego E Rincon-Limas
- Department of Neurology, McKnight Brain Institute, University of Florida and Norman Fixel Institute for Neurological Diseases, Gainesville, FL, USA
- Center for Translational Research in Neurodegenerative Disease and Department of Neuroscience, Gainesville, FL, USA
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Todd E Golde
- Center for Translational Research in Neurodegenerative Disease and Department of Neuroscience, Gainesville, FL, USA
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA
| | - Brenda D Moore
- Center for Translational Research in Neurodegenerative Disease and Department of Neuroscience, Gainesville, FL, USA.
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA.
| | - Yona Levites
- Center for Translational Research in Neurodegenerative Disease and Department of Neuroscience, Gainesville, FL, USA.
- McKnight Brain Institute, College of Medicine, University of Florida, Gainesville, FL, USA.
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Saini R, Shuaib S, Goyal D, Goyal B. Impact of Mutations on the Conformational Transition from α-Helix to β-Sheet Structures in Arctic-Type Aβ 40: Insights from Molecular Dynamics Simulations. ACS OMEGA 2020; 5:23219-23228. [PMID: 32954172 PMCID: PMC7495726 DOI: 10.1021/acsomega.0c02983] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Accepted: 08/13/2020] [Indexed: 05/13/2023]
Abstract
The amyloid-β (Aβ) protein aggregation into toxic oligomers and fibrils has been recognized as a key player in the pathogenesis of Alzheimer's disease. Recent experiments reported that a double alanine mutation (L17A/F19A) in the central hydrophobic core (CHC) region of [G22]Aβ40 (familial Arctic mutation) diminished the self-assembly propensity of [G22]Aβ40. However, the molecular mechanism behind the decreased aggregation tendency of [A17/A19/G22]Aβ40 is not well understood. Herein, we carried out molecular dynamics simulations to elucidate the structure and dynamics of [G22]Aβ40 and [A17/A19/G22]Aβ40. The results for the secondary structure analysis reveal a significantly increased amount of the helical content in the CHC and C-terminal region of [A17/A19/G22]Aβ40 as compared to [G22]Aβ40. The bending free-energy analysis of D23-K28 salt bridge suggests that the double alanine mutation in the CHC region of [G22]Aβ40 has the potential to reduce the fibril formation rate by 0.57 times of [G22]Aβ40. Unlike [G22]Aβ40, [A17/A19/G22]Aβ40 largely sampled helical conformation, as determined by the minimum energy conformations extracted from the free-energy landscape. The present study provided atomic level details into the experimentally observed diminished aggregation tendency of [A17/A19/G22]Aβ40 as compared to [G22]Aβ40.
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Affiliation(s)
- Rajneet
Kaur Saini
- Department
of Chemistry, Faculty of Basic and Applied Sciences, Sri Guru Granth Sahib World University, Fatehgarh Sahib 140406, Punjab, India
| | - Suniba Shuaib
- Department
of Chemistry, Faculty of Basic and Applied Sciences, Sri Guru Granth Sahib World University, Fatehgarh Sahib 140406, Punjab, India
| | - Deepti Goyal
- Department
of Chemistry, Faculty of Basic and Applied Sciences, Sri Guru Granth Sahib World University, Fatehgarh Sahib 140406, Punjab, India
| | - Bhupesh Goyal
- School
of Chemistry & Biochemistry, Thapar
Institute of Engineering & Technology, Patiala 147004, Punjab, India
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Hu S, Xian Y, Fan Y, Mak S, Wang J, Tang J, Pang Y, Pi R, Tsim KW, Liu F, Lin Z, Han Y. Significant combination of Aβ aggregation inhibitory and neuroprotective properties in silico, in vitro and in vivo by bis(propyl)-cognitin, a multifunctional anti-Alzheimer’s agent. Eur J Pharmacol 2020; 876:173065. [DOI: 10.1016/j.ejphar.2020.173065] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 03/08/2020] [Accepted: 03/10/2020] [Indexed: 01/06/2023]
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Soto-Mercado V, Mendivil-Perez M, Velez-Pardo C, Lopera F, Jimenez-Del-Rio M. Cholinergic-like neurons carrying PSEN1 E280A mutation from familial Alzheimer's disease reveal intraneuronal sAPPβ fragments accumulation, hyperphosphorylation of TAU, oxidative stress, apoptosis and Ca2+ dysregulation: Therapeutic implications. PLoS One 2020; 15:e0221669. [PMID: 32437347 PMCID: PMC7241743 DOI: 10.1371/journal.pone.0221669] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 05/06/2020] [Indexed: 01/31/2023] Open
Abstract
Alzheimer’s disease (AD) is a neurodegenerative disorder characterized by progressive memory loss and cognitive disturbance as a consequence of the loss of cholinergic neurons in the brain, neuritic plaques and hyperphosphorylation of TAU protein. Although the underlying mechanisms leading to these events are unclear, mutations in presenilin 1 (PSEN1), e.g., E280A (PSEN1 E280A), are causative factors for autosomal dominant early-onset familial AD (FAD). Despite advances in the understanding of the physiopathology of AD, there are no efficient therapies to date. Limitations in culturing brain-derived live neurons might explain the limited effectiveness of AD research. Here, we show that mesenchymal stromal (stem) cells (MSCs) can be used to model FAD, providing novel opportunities to study cellular mechanisms and to establish therapeutic strategies. Indeed, we cultured MSCs with the FAD mutation PSEN1 E280A and wild-type (WT) PSEN1 from umbilical cords and characterized the transdifferentiation of these cells into cholinergic-like neurons (ChLNs). PSEN1 E280A ChLNs but not WT PSEN1 ChLNs exhibited increased intracellular soluble amyloid precursor protein (sAPPf) fragments and extracellular Aβ42 peptide and TAU phosphorylation (at residues Ser202/Thr205), recapitulating the molecular pathogenesis of FAD caused by mutant PSEN1. Furthermore, PSEN1 E280A ChLNs presented oxidative stress (OS) as evidenced by the oxidation of DJ-1Cys106-SH into DJ-1Cys106-SO3 and the detection of DCF-positive cells and apoptosis markers such as activated pro-apoptosis proteins p53, c-JUN, PUMA and CASPASE-3 and the concomitant loss of the mitochondrial membrane potential and DNA fragmentation. Additionally, mutant ChLNs displayed Ca2+ flux dysregulation and deficient acetylcholinesterase (AChE) activity compared to control ChLNs. Interestingly, the inhibitor JNK SP600125 almost completely blocked TAU phosphorylation. Our findings demonstrate that FAD MSC-derived cholinergic neurons with the PSEN1 E280A mutation provide important clues for the identification of targetable pathological molecules.
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Affiliation(s)
- Viviana Soto-Mercado
- Neuroscience Research Group, Medical Research Institute, Faculty of Medicine, University of Antioquia (UdeA), SIU Medellin, Medellin, Colombia
| | - Miguel Mendivil-Perez
- Neuroscience Research Group, Medical Research Institute, Faculty of Medicine, University of Antioquia (UdeA), SIU Medellin, Medellin, Colombia
| | - Carlos Velez-Pardo
- Neuroscience Research Group, Medical Research Institute, Faculty of Medicine, University of Antioquia (UdeA), SIU Medellin, Medellin, Colombia
| | - Francisco Lopera
- Neuroscience Research Group, Medical Research Institute, Faculty of Medicine, University of Antioquia (UdeA), SIU Medellin, Medellin, Colombia
| | - Marlene Jimenez-Del-Rio
- Neuroscience Research Group, Medical Research Institute, Faculty of Medicine, University of Antioquia (UdeA), SIU Medellin, Medellin, Colombia
- * E-mail:
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Kurihara T, Asahi T, Sawamura N. Cereblon-mediated degradation of the amyloid precursor protein via the ubiquitin-proteasome pathway. Biochem Biophys Res Commun 2020; 524:236-241. [DOI: 10.1016/j.bbrc.2020.01.078] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 01/15/2020] [Indexed: 11/30/2022]
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Onodera W, Asahi T, Sawamura N. Positive selection of cereblon modified function including its E3 ubiquitin ligase activity and binding efficiency with AMPK. Mol Phylogenet Evol 2019; 135:78-85. [PMID: 30836149 DOI: 10.1016/j.ympev.2019.03.001] [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: 10/24/2018] [Revised: 02/06/2019] [Accepted: 03/01/2019] [Indexed: 12/20/2022]
Abstract
Cereblon (CRBN) is a substrate receptor for an E3 ubiquitin ligase that directly binds to target proteins resulting in cellular activities, such as energy metabolism, membrane potential regulation, and transcription factor degradation. Genetic mutations in human CRBN lead to intellectual disabilities. In addition, it draws pathological attention because direct binding with immunomodulatory drugs can cure multiple myeloma (MM) and lymphocytic leukemia. To further explore the function of CRBN, we focused on its molecular evolution. Since CRBN interacts directly with its substrates and is widely conserved in vertebrates, evolutionary study to identify the selective pressure on CRBN that occur during CRBN-substrate interaction is an effective approach to search for a novel active site. Using mammalian CRBN sequences, dN/dS analysis was conducted to detect positive selection. By multiple sequence alignment we found that the residue at position 366 was under positive selection. This residue is present in the substrate-binding domain of CRBN. Most mammals harbor cysteine at position 366, whereas rodents and chiroptera have serine at this site. Subsequently, we constructed a C366S human CRBN to confirm the potential of positive selection. Auto-ubiquitination activity occurs in E3 ubiquitin ligases, including CRBN, and increased in C366S CRBN, which lead to the conclusion that E3 ubiquitin ligase activity may have changed over the course of mammalian evolution. Furthermore, binding with AMP-activated protein kinase was augmented when the substitution was present, which is supported by coevolution analysis. These results suggest that the molecular evolution of CRBN occurred through codon-based positive selection, providing a new approach to investigate CRBN function.
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Affiliation(s)
- Wataru Onodera
- Faculty of Science and Engineering, Waseda University, TWIns, 2-2 Wakamatsu, Shinjuku, Tokyo 162-8480, Japan
| | - Toru Asahi
- Faculty of Science and Engineering, Waseda University, TWIns, 2-2 Wakamatsu, Shinjuku, Tokyo 162-8480, Japan; Research Organization for Nano & Life Innovation, Waseda University, Japan
| | - Naoya Sawamura
- Faculty of Science and Engineering, Waseda University, TWIns, 2-2 Wakamatsu, Shinjuku, Tokyo 162-8480, Japan; Research Organization for Nano & Life Innovation, Waseda University, Japan.
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Sawamura N, Ju Y, Asahi T. Cholinergic receptor, nicotinic, alpha 7 as a target molecule of Arctic mutant amyloid β. Neural Regen Res 2018; 13:1360-1361. [PMID: 30106044 PMCID: PMC6108216 DOI: 10.4103/1673-5374.235238] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- Naoya Sawamura
- Faculty of Science and Engineering; Research Organization for Nano & Life Innovation, Waseda University, Tokyo, Japan
| | - Ye Ju
- Faculty of Science and Engineering, Waseda University, Tokyo, Japan
| | - Toru Asahi
- Faculty of Science and Engineering; Research Organization for Nano & Life Innovation, Waseda University, Tokyo, Japan
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Wada T, Hanyu T, Nozaki K, Kataoka K, Kawatani T, Asahi T, Sawamura N. Antioxidant Activity of Ge-132, a Synthetic Organic Germanium, on Cultured Mammalian Cells. Biol Pharm Bull 2018; 41:749-753. [PMID: 29503400 DOI: 10.1248/bpb.b17-00949] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Ge-132 is a synthetic organic germanium that is used as a dietary supplement. The antioxidant activity of Ge-132 on cultured mammalian cells was investigated in this study. First, Ge-132 cytotoxicity on mammalian cultured cells was determined by measuring lactate dehydrogenase (LDH) levels. Ge-132 had no cytotoxic effect on three different cell lines. Second, the cell proliferative effect of Ge-132 was determined by measuring ATP content of whole cells and counting them. Ge-132 treatment of Chinese hamster ovary (CHO-K1) and SH-SY5Y cells promoted cell proliferation in a dose-dependent manner. Finally, antioxidant activity of Ge-132 against hydrogen peroxide-induced oxidative stress was determined by measuring the levels of intracellular reactive oxygen species (ROS) and carbonylated proteins. Pre-incubation of CHO-K1 and SH-SY5Y cells with Ge-132 suppressed intracellular ROS production and carbonylated protein levels induced by hydrogen peroxide. Our results suggest that Ge-132 has antioxidant activity against hydrogen peroxide-induced oxidative stress.
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Affiliation(s)
| | - Takashi Hanyu
- Faculty of Science and Engineering, Waseda University
| | - Kota Nozaki
- Faculty of Science and Engineering, Waseda University
| | | | | | - Toru Asahi
- Faculty of Science and Engineering, Waseda University.,Research Organization for Nano & Life Innovation, Waseda University
| | - Naoya Sawamura
- Faculty of Science and Engineering, Waseda University.,Research Organization for Nano & Life Innovation, Waseda University
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The Neuroprotective Effect of Thalidomide against Ischemia through the Cereblon-mediated Repression of AMPK Activity. Sci Rep 2018; 8:2459. [PMID: 29410497 PMCID: PMC5802741 DOI: 10.1038/s41598-018-20911-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2017] [Accepted: 01/25/2018] [Indexed: 01/28/2023] Open
Abstract
Thalidomide was originally used as a sedative and found to be a teratogen, but now thalidomide and its derivatives are widely used to treat haematologic malignancies. Accumulated evidence suggests that thalidomide suppresses nerve cell death in neurologic model mice. However, detailed molecular mechanisms are unknown. Here we examined the molecular mechanism of thalidomide’s neuroprotective effects, focusing on its target protein, cereblon (CRBN), and its binding protein, AMP-activated protein kinase (AMPK), which plays an important role in maintaining intracellular energy homeostasis in the brain. We used a cerebral ischemia rat model of middle cerebral artery occlusion/reperfusion (MCAO/R). Thalidomide treatment significantly decreased the infarct volume and neurological deficits of MCAO/R rats. AMPK was the key signalling protein in this mechanism. Furthermore, we considered that the AMPK–CRBN interaction was altered when neuroprotective action by thalidomide occurred in cells under ischemic conditions. Binding was strong between AMPK and CRBN in normal SH-SY5Y cells, but was weakened by the addition of H2O2. However, when thalidomide was administered at the same time as H2O2, the binding of AMPK and CRBN was partly restored. These results suggest that thalidomide inhibits the activity of AMPK via CRBN under oxidative stress and suppresses nerve cell death.
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12
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Ju Y, Asahi T, Sawamura N. Arctic Aβ40 blocks the nicotine-induced neuroprotective effect of CHRNA7 by inhibiting the ERK1/2 pathway in human neuroblastoma cells. Neurochem Int 2017; 110:49-56. [PMID: 28890319 DOI: 10.1016/j.neuint.2017.09.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 09/01/2017] [Accepted: 09/06/2017] [Indexed: 12/23/2022]
Abstract
Amyloid β protein (Aβ) plays a central role in Alzheimer's disease (AD) pathogenesis. Point mutations in the Aβ sequence, which cluster around the central hydrophobic core of the peptide, are associated with familial AD (FAD). Several mutations have been identified, with the Arctic mutation exhibiting a purely cognitive phenotype that is typical of AD. Our previous findings suggest that Arctic Aβ40 binds to and aggregates with CHRNA7, thereby inhibiting the calcium response and signaling pathways downstream of the receptor. Activation of CHRNA7 is neuroprotective both in vitro and in vivo. Therefore, in the present study, we investigated whether Arctic Aβ40 affects neuronal survival and/or death via CHRNA7. Using human neuroblastoma SH-SY5Y cells, we found that the neuroprotective function of CHRNA7 is blocked by CHRNA7 knockdown using RNA interference. Furthermore, Arctic Aβ40 blocked the neuroprotective effect of nicotine by inhibiting the ERK1/2 pathway downstream of CHRNA7. Moreover, we show that ERK1/2 activation mediates the neuroprotective effect of nicotine against oxidative stress. Collectively, our findings further our understanding of the molecular pathogenesis of Arctic FAD.
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Affiliation(s)
- Ye Ju
- Faculty of Science and Engineering, Waseda University, TWIns, 2-2 Wakamatsu, Shinjuku, Tokyo 162-8480, Japan
| | - Toru Asahi
- Faculty of Science and Engineering, Waseda University, TWIns, 2-2 Wakamatsu, Shinjuku, Tokyo 162-8480, Japan; Research Organization for Nano & Life Innovation, Waseda University #03C309, TWIns, 2-2 Wakamatsu, Shinjuku, Tokyo 162-8480, Japan
| | - Naoya Sawamura
- Faculty of Science and Engineering, Waseda University, TWIns, 2-2 Wakamatsu, Shinjuku, Tokyo 162-8480, Japan; Research Organization for Nano & Life Innovation, Waseda University #03C309, TWIns, 2-2 Wakamatsu, Shinjuku, Tokyo 162-8480, Japan.
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Wada T, Asahi T, Sawamura N. Nuclear cereblon modulates transcriptional activity of Ikaros and regulates its downstream target, enkephalin, in human neuroblastoma cells. Biochem Biophys Res Commun 2016; 477:388-94. [DOI: 10.1016/j.bbrc.2016.06.091] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Accepted: 06/17/2016] [Indexed: 11/16/2022]
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Bertrand D, Lee CHL, Flood D, Marger F, Donnelly-Roberts D. Therapeutic Potential of α7 Nicotinic Acetylcholine Receptors. Pharmacol Rev 2015; 67:1025-73. [DOI: 10.1124/pr.113.008581] [Citation(s) in RCA: 108] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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