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Feng Q, Zhang X, Zhang N, Gu H, Wang N, Chen J, Yuan X, Wang L. The dissolution, reassembly and further clearance of amyloid-β fibrils by tailor-designed dissociable nanosystem for Alzheimer's disease therapy. EXPLORATION (BEIJING, CHINA) 2024; 4:20230048. [PMID: 38939864 PMCID: PMC11189570 DOI: 10.1002/exp.20230048] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Accepted: 09/04/2023] [Indexed: 06/29/2024]
Abstract
The fibrillation of amyloid-β (Aβ) is the critical causal factor in Alzheimer's disease (AD), the dissolution and clearance of which are promising for AD therapy. Although many Aβ inhibitors are developed, their low Aβ-binding affinity results in unsatisfactory effect. To solve this challenge, the Aβ sequence-matching strategy is proposed to tail-design dissociable nanosystem (B6-PNi NPs). Herein, B6-PNi NPs aim to improve Aβ-binding affinity for effective dissolution of amyloid fibrils, as well as to interfere with the in vivo fate of amyloid for Aβ clearance. Results show that B6-PNi NPs decompose into small nanostructures and expose Aβ-binding sites in response to AD microenvironment, and then capture Aβ via multiple interactions, including covalent linkage formed by nucleophilic substitution reaction. Such high Aβ-binding affinity disassembles Aβ fibrils into Aβ monomers, and induces the reassembly of Aβ&nanostructure composite, thereby promoting microglial Aβ phogocytosis/clearance via Aβ receptor-mediated endocytosis. After B6-PNi NPs treatment, the Aβ burden, neuroinflammation and cognitive impairments are relieved in AD transgenic mice. This work provides the Aβ sequence-matching strategy for Aβ inhibitor design in AD treatment, showing meaningful insight in biomedicine.
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Affiliation(s)
- Qianhua Feng
- School of Pharmaceutical SciencesZhengzhou UniversityZhengzhouChina
- Henan Key Laboratory of Targeting Therapy and Diagnosis for Critical DiseasesZhengzhouChina
| | - Xueli Zhang
- School of Pharmaceutical SciencesZhengzhou UniversityZhengzhouChina
| | - Nan Zhang
- School of Pharmaceutical SciencesZhengzhou UniversityZhengzhouChina
- Henan Key Laboratory of Targeting Therapy and Diagnosis for Critical DiseasesZhengzhouChina
| | - Huan Gu
- Department of Chemistry, Chemical and Biomedical EngineeringUniversity of New HavenWest HavenUSA
| | - Ning Wang
- School of Pharmaceutical SciencesZhengzhou UniversityZhengzhouChina
| | - Jing Chen
- School of Pharmaceutical SciencesZhengzhou UniversityZhengzhouChina
| | - Xiaomin Yuan
- School of Pharmaceutical SciencesZhengzhou UniversityZhengzhouChina
| | - Lei Wang
- School of Pharmaceutical SciencesZhengzhou UniversityZhengzhouChina
- Henan Key Laboratory of Targeting Therapy and Diagnosis for Critical DiseasesZhengzhouChina
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2
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Nguyen PH, Derreumaux P. Multistep molecular mechanisms of Aβ16-22 fibril formation revealed by lattice Monte Carlo simulations. J Chem Phys 2023; 158:235101. [PMID: 37318171 DOI: 10.1063/5.0149419] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Accepted: 05/26/2023] [Indexed: 06/16/2023] Open
Abstract
As a model of self-assembly from disordered monomers to fibrils, the amyloid-β fragment Aβ16-22 was subject to past numerous experimental and computational studies. Because dynamics information between milliseconds and seconds cannot be assessed by both studies, we lack a full understanding of its oligomerization. Lattice simulations are particularly well suited to capture pathways to fibrils. In this study, we explored the aggregation of 10 Aβ16-22 peptides using 65 lattice Monte Carlo simulations, each simulation consisting of 3 × 109 steps. Based on a total of 24 and 41 simulations that converge and do not converge to the fibril state, respectively, we are able to reveal the diversity of the pathways leading to fibril structure and the conformational traps slowing down the fibril formation.
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Affiliation(s)
- Phuong H Nguyen
- CNRS, Université Paris Cité, UPR 9080, Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique, Fondation Edmond de Rothschild, 13 Rue Pierre et Marie Curie, 75005 Paris, France
| | - Philippe Derreumaux
- CNRS, Université Paris Cité, UPR 9080, Laboratoire de Biochimie Théorique, Institut de Biologie Physico-Chimique, Fondation Edmond de Rothschild, 13 Rue Pierre et Marie Curie, 75005 Paris, France
- Institut Universitaire de France (IUF), 75005 Paris, France
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3
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Shi JM, Li HY, Liu H, Zhu L, Guo YB, Pei J, An H, Li YS, Li SD, Zhang ZY, Zheng Y. N-terminal Domain of Amyloid-β Impacts Fibrillation and Neurotoxicity. ACS OMEGA 2022; 7:38847-38855. [PMID: 36340079 PMCID: PMC9631750 DOI: 10.1021/acsomega.2c04583] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/20/2022] [Accepted: 10/07/2022] [Indexed: 06/16/2023]
Abstract
Alzheimer's disease is characterized by the presence of distinct amyloid-β peptide (Aβ) assemblies with diverse sizes, shapes, and toxicity. However, the primary determinants of Aβ aggregation and neurotoxicity remain unknown. Here, the N-terminal amino acid residues of Aβ42 that distinguished between humans and rats were substituted. The effects of these modifications on the ability of Aβ to aggregate and its neurotoxicity were investigated using biochemical, biophysical, and cellular techniques. The Aβ-derived diffusible ligand, protofibrils, and fibrils formed by the N-terminal mutational peptides, including Aβ42(R5G), Aβ42(Y10F), and rat Aβ42, were indistinguishable by conventional techniques such as size-exclusion chromatography, negative-staining transmission electron microscopy and silver staining, whereas the amyloid fibrillation detected by thioflavin T assay was greatly inhibited in vitro. Using circular dichroism spectroscopy, we discovered that both Aβ42 and Aβ42(Y10F) generated protofibrils and fibrils with a high proportion of parallel β-sheet structures. Furthermore, protofibrils formed by other mutant Aβ peptides and N-terminally shortened peptides were incapable of inducing neuronal death, with the exception of Aβ42 and Aβ42(Y10F). Our findings indicate that the N-terminus of Aβ is important for its fibrillation and neurotoxicity.
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Affiliation(s)
- Jing-Ming Shi
- Key
Laboratory for Molecular Genetic Mechanisms and Intervention Research
on High Altitude Disease of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang 712082, China
| | - Hai-Yun Li
- Department
of Biochemistry and Molecular Biology, School of Basic Medicine, Xi’an Jiaotong University, Xi’an 710061, China
| | - Hang Liu
- Key
Laboratory for Molecular Genetic Mechanisms and Intervention Research
on High Altitude Disease of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang 712082, China
| | - Li Zhu
- School
of Life Sciences, Lanzhou University, Lanzhou 730000, China
| | - Yi-Bo Guo
- Key
Laboratory for Molecular Genetic Mechanisms and Intervention Research
on High Altitude Disease of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang 712082, China
| | - Jie Pei
- Lanzhou
Institute of Husbandry and Pharmaceutical Sciences, Chinese Academy of Agricultural Sciences, Lanzhou 730000, China
| | - Hao An
- School
of Life Sciences, Lanzhou University, Lanzhou 730000, China
| | - Yan-Song Li
- Key
Laboratory for Molecular Genetic Mechanisms and Intervention Research
on High Altitude Disease of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang 712082, China
| | - Sha-Di Li
- Key
Laboratory for Molecular Genetic Mechanisms and Intervention Research
on High Altitude Disease of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang 712082, China
| | - Ze-Yu Zhang
- Key
Laboratory for Molecular Genetic Mechanisms and Intervention Research
on High Altitude Disease of Tibet Autonomous Region, School of Medicine, Xizang Minzu University, Xianyang 712082, China
| | - Yi Zheng
- School
of Medicine, University of Electronic Science
and Technology of China, Chengdu 610054, China
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4
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Microglia Impairs Proliferation and Induces Senescence In-Vitro in NGF Releasing Cells Used in Encapsulated Cell Biodelivery for Alzheimer's Disease Therapy. Int J Mol Sci 2022; 23:ijms23169011. [PMID: 36012296 PMCID: PMC9409429 DOI: 10.3390/ijms23169011] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 08/01/2022] [Accepted: 08/09/2022] [Indexed: 12/06/2022] Open
Abstract
There is no cure yet available for Alzheimer's disease (AD). We recently optimized encapsulated cell biodelivery (ECB) devices releasing human mature nerve growth factor (hmNGF), termed ECB-NGF, to the basal forebrain of AD patients. The ECB-NGF delivery resulted in increased CSF cholinergic markers, improved glucose metabolism, and positive effects on cognition in AD patients. However, some ECB-NGF implants showed altered hmNGF release post-explantation. To optimize the ECB-NGF platform for future therapeutic purposes, we initiated in-vitro optimization studies by exposing ECB-NGF devices to physiological factors present within the AD brain. We report here that microglia cells can impair hmNGF release from ECB-NGF devices in-vitro, which can be reversed by transferring the devices to fresh culture medium. Further, we exposed the hmNGF secreting human ARPE-19 cell line (NGC0211) to microglia (HMC3) conditioned medium (MCM; untreated or treated with IL-1β/IFNγ/Aβ40/Aβ42), and evaluated biochemical stress markers (ROS, GSH, ΔΨm, and Alamar Blue assay), cell death indicators (Annexin-V/PI), cell proliferation (CFSE retention and Ki67) and senescence markers (SA-β-gal) in NGC0211 cells. MCMs from activated microglia reduced cell proliferation and induced cell senescence in NGC0211 cells, which otherwise resist biochemical alterations and cell death. These data indicate a critical but reversible impact of activated microglia on NGC0211 cells.
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