1
|
Martin-Blazquez A, Martin-Lorenzo M, Santiago-Hernandez A, Heredero A, Donado A, Lopez JA, Anfaiha-Sanchez M, Ruiz-Jimenez R, Esteban V, Vazquez J, Aldamiz-Echevarria G, Alvarez-Llamas G. Analysis of Vascular Smooth Muscle Cells from Thoracic Aortic Aneurysms Reveals DNA Damage and Cell Cycle Arrest as Hallmarks in Bicuspid Aortic Valve Patients. J Proteome Res 2024; 23:3012-3024. [PMID: 38594816 PMCID: PMC11301675 DOI: 10.1021/acs.jproteome.3c00649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 02/26/2024] [Accepted: 03/24/2024] [Indexed: 04/11/2024]
Abstract
Thoracic aortic aneurysm (TAA) is mainly sporadic and with higher incidence in the presence of a bicuspid aortic valve (BAV) for unknown reasons. The lack of drug therapy to delay TAA progression lies in the limited knowledge of pathophysiology. We aimed to identify the molecular hallmarks that differentiate the aortic dilatation associated with BAV and tricuspid aortic valve (TAV). Aortic vascular smooth muscle cells (VSMCs) isolated from sporadic TAA patients with BAV or TAV were analyzed by mass spectrometry. DNA oxidative damage assay and cell cycle profiling were performed in three independent cohorts supporting proteomics data. The alteration of secreted proteins was confirmed in plasma. Stress phenotype, oxidative stress, and enhanced DNA damage response (increased S-phase arrest and apoptosis) were found in BAV-TAA patients. The increased levels of plasma C1QTNF5, LAMA2, THSB3, and FAP confirm the enhanced stress in BAV-TAA. Plasma FAP and BGN point to an increased inflammatory condition in TAV. The arterial wall of BAV patients shows a limited capacity to counteract drivers of sporadic TAA. The molecular pathways identified support the need of differential molecular diagnosis and therapeutic approaches for BAV and TAV patients, showing specific markers in plasma which may serve to monitor therapy efficacy.
Collapse
Affiliation(s)
- Ariadna Martin-Blazquez
- Immunology
Department, IIS-Fundación Jiménez
Díaz, Fundación Jiménez Díaz Hospital-UAM, 28040 Madrid, Spain
| | - Marta Martin-Lorenzo
- Immunology
Department, IIS-Fundación Jiménez
Díaz, Fundación Jiménez Díaz Hospital-UAM, 28040 Madrid, Spain
| | | | - Angeles Heredero
- Cardiac
Surgery Service, Fundación Jiménez
Díaz Hospital-UAM, 28040 Madrid, Spain
| | - Alicia Donado
- Cardiac
Surgery Service, Fundación Jiménez
Díaz Hospital-UAM, 28040 Madrid, Spain
| | - Juan A Lopez
- Laboratory
of Cardiovascular Proteomics, Centro Nacional
de Investigaciones Cardiovasculares (CNIC), 28029 Madrid, Spain
- CIBER
de Enfermedades Cardiovasculares (CIBERCV), 28029 Madrid, Spain
| | - Miriam Anfaiha-Sanchez
- Immunology
Department, IIS-Fundación Jiménez
Díaz, Fundación Jiménez Díaz Hospital-UAM, 28040 Madrid, Spain
| | - Rocio Ruiz-Jimenez
- Immunology
Department, IIS-Fundación Jiménez
Díaz, Fundación Jiménez Díaz Hospital-UAM, 28040 Madrid, Spain
| | - Vanesa Esteban
- Department
of Allergy and Immunology, IIS-Fundación
Jiménez Díaz, Fundación Jiménez Díaz
Hospital-UAM, 28040 Madrid, Spain
- Faculty
of Medicine and Biomedicine, Alfonso X El
Sabio University, 28691 Madrid, Spain
| | - Jesus Vazquez
- Laboratory
of Cardiovascular Proteomics, Centro Nacional
de Investigaciones Cardiovasculares (CNIC), 28029 Madrid, Spain
- CIBER
de Enfermedades Cardiovasculares (CIBERCV), 28029 Madrid, Spain
| | | | - Gloria Alvarez-Llamas
- Immunology
Department, IIS-Fundación Jiménez
Díaz, Fundación Jiménez Díaz Hospital-UAM, 28040 Madrid, Spain
- RICORS2040, Fundación Jiménez Díaz, 28040 Madrid, Spain
- Department
of Biochemistry and Molecular Biology, Complutense
University, 28040 Madrid, Spain
| |
Collapse
|
2
|
Mesdaghi S, Price R, Li M, Migrino RQ, Madine J, Rigden DJ. Investigating Medin Cleavage Accessibility in MfgE8: Conformational Insights Derived from Molecular Dynamics Simulations and AlphaFold2 Models. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.07.27.605412. [PMID: 39131300 PMCID: PMC11312466 DOI: 10.1101/2024.07.27.605412] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/13/2024]
Abstract
Recent studies have indicated that the human amyloidogenic protein medin is associated with a range of vascular diseases, including aortic aneurysms, vascular dementia, and Alzheimer's disease. Medin accumulates in the vasculature with age, leading to endothelial dysfunction through oxidative and nitrative stress and inducing pro-inflammatory activation. Medin is a cleavage product from the C2 domain of MfgE8. The exact mechanism of medin production from MfgE8 is unknown, with crystal structures of homologous C2 domains suggesting that the cleavage sites are buried, requiring a conformational transition for medin production. Molecular dynamics simulations can explore a wide range of conformations, from small-scale bond rotations to large-scale changes like protein folding or ligand binding. This study employed a combination of full-atom and coarse-grained molecular dynamics simulations, along with CONCOORD- and AlphaFold2-generated models, to investigate MfgE8 conformations and their implications for medin cleavage site accessibility. The simulations revealed that MfgE8 tends to adopt a compact conformation with the RGD motif, important for cell attachment within the N-terminal domain, and the medin region in the C-terminal domain close in proximity. Formation of this compact structure is facilitated by interdomain electrostatic interactions that promote stability and in turn decrease the solvent-accessible surface area of the medin region and particularly the C-terminal medin cleavage site. This data enhances current knowledge on medin generation to propose that alterations in local environmental conditions, possibly through changes in glycosylation or other post-translational modifications are required to induce MfgE8 to unfold partially or fully: this would result in enhanced accessibility of the cleavage sites and therefore enable medin generation.
Collapse
Affiliation(s)
- Shahram Mesdaghi
- Institute of Systems, Molecular & Integrative Biology, University of Liverpool, Biosciences Building, Crown Street, Liverpool L69 7ZB, UK
- Computational Biology Facility, MerseyBio, University of Liverpool, Crown Street, Liverpool L69 7ZB, UK
| | - Rebecca Price
- Institute of Systems, Molecular & Integrative Biology, University of Liverpool, Biosciences Building, Crown Street, Liverpool L69 7ZB, UK
| | - Ming Li
- Phoenix Veterans Affairs, Phoenix, Arizona, USA
- University of Arizona College of Medicine-Phoenix, Arizona, USA
| | - Raymond Q Migrino
- Phoenix Veterans Affairs, Phoenix, Arizona, USA
- University of Arizona College of Medicine-Phoenix, Arizona, USA
| | - Jillian Madine
- Institute of Systems, Molecular & Integrative Biology, University of Liverpool, Biosciences Building, Crown Street, Liverpool L69 7ZB, UK
| | - Daniel J Rigden
- Institute of Systems, Molecular & Integrative Biology, University of Liverpool, Biosciences Building, Crown Street, Liverpool L69 7ZB, UK
| |
Collapse
|
3
|
Kieliszek M, Sapazhenkava K. The Promising Role of Selenium and Yeast in the Fight Against Protein Amyloidosis. Biol Trace Elem Res 2024:10.1007/s12011-024-04245-x. [PMID: 38829477 DOI: 10.1007/s12011-024-04245-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 05/20/2024] [Indexed: 06/05/2024]
Abstract
In recent years, increasing attention has been paid to research on diseases related to the deposition of misfolded proteins (amyloids) in various organs. Moreover, modern scientists emphasise the importance of selenium as a bioelement necessary for the proper functioning of living organisms. The inorganic form of selenium-sodium selenite (redox-active)-can prevent the formation of an insoluble polymer in proteins. It is very important to undertake tasks aimed at understanding the mechanisms of action of this element in inhibiting the formation of various types of amyloid. Furthermore, yeast cells play an important role in this matter as a eukaryotic model organism, which is intensively used in molecular research on protein amyloidosis. Due to the lack of appropriate treatment in the general population, the problem of amyloidosis remains unsolved. This extracellular accumulation of amyloid is one of the main factors responsible for the occurrence of Alzheimer's disease. The review presented here contains scientific information discussing a brief description of the possibility of amyloid formation in cells and the use of selenium as a factor preventing the formation of these protein aggregates. Recent studies have shown that the yeast model can be successfully used as a eukaryotic organism in biotechnological research aimed at understanding the essence of the entire amyloidosis process. Understanding the mechanisms that regulate the reaction of yeast to selenium and the phenomenon of amyloidosis is important in the aetiology and pathogenesis of various disease states. Therefore, it is imperative to conduct further research and analysis aimed at explaining and confirming the role of selenium in the processes of protein misfolding disorders. The rest of the article discusses the characteristics of food protein amyloidosis and their use in the food industry. During such tests, their toxicity is checked because not all food proteins can produce amyloid that is toxic to cells. It should also be noted that a moderate diet is beneficial for the corresponding disease relief caused by amyloidosis.
Collapse
Affiliation(s)
- Marek Kieliszek
- Department of Food Biotechnology and Microbiology, Institute of Food Sciences, Warsaw University of Life Sciences-SGGW, Nowoursynowska 159 C, Warsaw, 02-776, Poland.
| | - Katsiaryna Sapazhenkava
- Department of Food Biotechnology and Microbiology, Institute of Food Sciences, Warsaw University of Life Sciences-SGGW, Nowoursynowska 159 C, Warsaw, 02-776, Poland
| |
Collapse
|
4
|
Gutierrez J, Bos D, Turan TN, Hoh B, Hilal S, Arenillas JF, Schneider JA, Chimowitz I M, Morgello S. Pathology-based brain arterial disease phenotypes and their radiographic correlates. J Stroke Cerebrovasc Dis 2024; 33:107642. [PMID: 38395095 DOI: 10.1016/j.jstrokecerebrovasdis.2024.107642] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Revised: 02/12/2024] [Accepted: 02/18/2024] [Indexed: 02/25/2024] Open
Abstract
INTRODUCTION Brain arterial diseases, including atherosclerosis, vasculitis, and dissections, are major contributors to cerebrovascular morbidity and mortality worldwide. These diseases not only increase the risk of stroke but also play a significant role in neurodegeneration and dementia. Clear and unambiguous terminology and classification of brain arterial disease phenotypes is crucial for research and clinical practice. MATERIAL AND METHODS This review aims to summarize and harmonize the terminology used for brain large and small arterial phenotypes based on pathology studies and relate them to imaging phenotypes used in medical research and clinical practice. CONCLUSIONS AND RESULTS Arteriosclerosis refers to hardening of the arteries but does not specify the underlying etiology. Specific terms such as atherosclerosis, calcification, or non-atherosclerotic fibroplasia are preferred. Atherosclerosis is defined pathologically by an atheroma. Other brain arterial pathologies occur and should be distinguished from atherosclerosis given therapeutic implications. On brain imaging, intracranial arterial luminal stenosis is usually attributed to atherosclerosis in the presence of atherosclerotic risk factors but advanced high-resolution arterial wall imaging has the potential to more accurately identify the underlying pathology. Regarding small vessel disease, arteriosclerosis is ambiguous and arteriolosclerosis is often used to denote the involvement of arterioles rather than arteries. Lipohyalinosis is sometimes used synonymously with arteriolosclerosis, but less accurately describes this common small vessel thickening which uncommonly shows lipid. Specific measures of small vessel wall thickness, the relationship to the lumen as well as changes in the layer composition might convey objective, measurable data regarding the status of brain small vessels.
Collapse
Affiliation(s)
- Jose Gutierrez
- Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University, 710 W 168th Street, 6th floor, Suite 639, New York, NY 10032, United States.
| | - Daniel Bos
- Department of Epidemiology, ErasmusMC, Dr. Molewaterplein 40, 3015 GD Rotterdam, Room NA-2710,Postbus 2040, Rotterdam 3000, the Netherlands; Department of Radiology & Nuclear Medicine and Epidemiology, ErasmusMC, Rotterdam, the Netherlands.
| | - Tanya N Turan
- Department of Neurology, Medical University of South Carolina, Charleston, SC, United States
| | - Brian Hoh
- Department of Neurosurgery, University of Florida, Gainsville, FL, United States
| | - Saima Hilal
- Memory Aging and Cognition Center, National University Health System, Singapore; Department of Pharmacology, National University of Singapore, Singapore; Saw Swee Hock School of Public Health, National University of Singapore and National University Health System, Singapore
| | - Juan F Arenillas
- Department of Neurology, Hospital Clínico Universitario, Valladolid; Department of Medicine, University of Valladolid, Spain
| | - Julie A Schneider
- Departments of Pathology and Neurological Sciences, Rush University Medical Center, Chicago, IL, United States
| | - Marc Chimowitz I
- Department of Neurology, Medical University of South Carolina, Charleston, SC, United States
| | - Susan Morgello
- Departments of Neurology, Neuroscience, and Pathology, Mount Sinai Medical Center, New York, NY, United States
| |
Collapse
|
5
|
Huang F, Fan X, Wang Y, Wang C, Zou Y, Lian J, Ding F, Sun Y. Unveiling Medin Folding and Dimerization Dynamics and Conformations via Atomistic Discrete Molecular Dynamics Simulations. J Chem Inf Model 2023; 63:6376-6385. [PMID: 37782573 PMCID: PMC10752383 DOI: 10.1021/acs.jcim.3c01267] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
Medin is a principal component of localized amyloid found in the vasculature of individuals over 50 years old. Its amyloid aggregation has been linked to endothelial dysfunction and vascular inflammation, contributing to the pathogenesis of various vascular diseases. Despite its significance, the structures of the medin monomer, oligomer, and fibril remain elusive, and the dynamic processes of medin aggregation are not fully understood. In this study, we comprehensively investigated the medin folding and dimerization dynamics and conformations using atomistic discrete molecular dynamics simulations. Our simulation results suggested that the folding initiation of the medin involved the formation of β-sheets around medin30-41 and medin42-50, with subsequent capping of other segments to their β-sheet edges. Medin monomers typically consisted of three or four β-strands, along with a dynamic N-terminal helix. Two isolated medin peptides readily aggregated into a β-sheet-rich dimer, displaying a strong aggregation propensity. Dimerization of medin not only enhanced the β-sheet conformations but also led to the formation of β-barrel oligomers. The aggregation tendencies of medin1-18 and medin19-29 were relatively weak. However, the segments of medin30-41 and medin42-50 played a crucial role as they primarily formed a β-sheet core and facilitated medin1-18 and medin19-29 to form intra- and interpeptide β-sheets. The findings highlight the critical role of the medin30-41 and medin42-50 regions in stabilizing the monomer structure and driving the medin amyloid aggregation. These regions could potentially serve as promising targets for designing antiamyloid inhibitors against amyloid aggregation of medin. Additionally, our study provides a full picture of the monomer conformations and dimerization dynamics for medin, which will help better understand the pathology of medin aggregation.
Collapse
Affiliation(s)
- Fengjuan Huang
- Ningbo Institute of Innovation for Combined Medicine and Engineering (NIIME), Ningbo Medical Center Lihuili Hospital, Ningbo 315211, China
| | - Xinjie Fan
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Ying Wang
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
| | - Chuang Wang
- School of Medicine, Ningbo University, Ningbo 315211, China
| | - Yu Zou
- Department of Sport and Exercise Science, Zhejiang University, Hangzhou 310058, China
| | - Jiangfang Lian
- Ningbo Institute of Innovation for Combined Medicine and Engineering (NIIME), Ningbo Medical Center Lihuili Hospital, Ningbo 315211, China
| | - Feng Ding
- Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, United States
| | - Yunxiang Sun
- School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
- Department of Physics and Astronomy, Clemson University, Clemson, SC 29634, United States
| |
Collapse
|
6
|
Madine J, Davies HA, Migrino RQ, Ruotsalainen SE, Wagner J, Neher JJ. Medin amyloid may drive arterial aging and disease in the periphery and brain. NATURE AGING 2023; 3:1039-1041. [PMID: 37620584 DOI: 10.1038/s43587-023-00481-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/26/2023]
Affiliation(s)
- Jillian Madine
- Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, UK
| | - Hannah A Davies
- Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, UK
| | - Raymond Q Migrino
- Phoenix Veterans Affairs Health Care System and University of Arizona College of Medicine-Phoenix, Phoenix, AZ, USA
| | - Sanni E Ruotsalainen
- Institute for Molecular Medicine Finland (FIMM), HiLIFE, University of Helsinki, Helsinki, Finland
| | - Jessica Wagner
- German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Jonas J Neher
- German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany.
- Department of Cellular Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany.
- Metabolic Biochemistry, Biomedical Center (BMC), Faculty of Medicine, LMU Munich, Munich, Germany.
| |
Collapse
|
7
|
Whitehead M, Yusoff S, Ahmad S, Schmidt L, Mayr M, Madine J, Middleton D, Shanahan CM. Vascular smooth muscle cell senescence accelerates medin aggregation via small extracellular vesicle secretion and extracellular matrix reorganization. Aging Cell 2023; 22:e13746. [PMID: 36433666 PMCID: PMC9924949 DOI: 10.1111/acel.13746] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 11/07/2022] [Accepted: 11/13/2022] [Indexed: 11/27/2022] Open
Abstract
Vascular amyloidosis, caused when peptide monomers aggregate into insoluble amyloid, is a prevalent age-associated pathology. Aortic medial amyloid (AMA) is the most common human amyloid and is composed of medin, a 50-amino acid peptide. Emerging evidence has implicated extracellular vesicles (EVs) as mediators of pathological amyloid accumulation in the extracellular matrix (ECM). To determine the mechanisms of AMA formation with age, we explored the impact of vascular smooth muscle cell (VSMC) senescence, EV secretion, and ECM remodeling on medin accumulation. Medin was detected in EVs secreted from primary VSMCs. Small, round medin aggregates colocalized with EV markers in decellularized ECM in vitro and medin was shown on the surface of EVs deposited in the ECM. Decreasing EV secretion with an inhibitor attenuated aggregation and deposition of medin in the ECM. Medin accumulation in the aortic wall of human subjects was strongly correlated with age and VSMC senescence increased EV secretion, increased EV medin loading and triggered deposition of fibril-like medin. Proteomic analysis showed VSMC senescence induced changes in EV cargo and ECM composition, which led to enhanced EV-ECM binding and accelerated medin aggregation. Abundance of the proteoglycan, HSPG2, was increased in the senescent ECM and colocalized with EVs and medin. Isolated EVs selectively bound to HSPG2 in the ECM and its knock-down decreased formation of fibril-like medin structures. These data identify VSMC-derived EVs and HSPG2 in the ECM as key mediators of medin accumulation, contributing to age-associated AMA development.
Collapse
Affiliation(s)
- Meredith Whitehead
- School of Cardiovascular and Metabolic Medicine & SciencesKing's College LondonLondonUK
| | - Syabira Yusoff
- School of Cardiovascular and Metabolic Medicine & SciencesKing's College LondonLondonUK
| | - Sadia Ahmad
- School of Cardiovascular and Metabolic Medicine & SciencesKing's College LondonLondonUK
| | - Lukas Schmidt
- School of Cardiovascular and Metabolic Medicine & SciencesKing's College LondonLondonUK
| | - Manuel Mayr
- School of Cardiovascular and Metabolic Medicine & SciencesKing's College LondonLondonUK
| | - Jillian Madine
- Institute of Systems, Molecular and Integrative BiologyUniversity of LiverpoolLondonUK
| | | | - Catherine M. Shanahan
- School of Cardiovascular and Metabolic Medicine & SciencesKing's College LondonLondonUK
| |
Collapse
|
8
|
Milk Fat Globule Epidermal Growth Factor VIII Fragment Medin in Age-Associated Arterial Adverse Remodeling and Arterial Disease. Cells 2023; 12:cells12020253. [PMID: 36672188 PMCID: PMC9857039 DOI: 10.3390/cells12020253] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 12/28/2022] [Accepted: 01/03/2023] [Indexed: 01/11/2023] Open
Abstract
Medin, a small 50-amino acid peptide, is an internal cleaved product from the second discoidin domain of milk fat globule epidermal growth factor VIII (MFG-E8) protein. Medin has been reported as the most common amylogenic protein in the upper part of the arterial system, including aortic, temporal, and cerebral arterial walls in the elderly. Medin has a high affinity to elastic fibers and is closely associated with arterial degenerative inflammation, elastic fiber fragmentation, calcification, and amyloidosis. In vitro, treating with the medin peptide promotes the inflammatory phenotypic shift of both endothelial cells and vascular smooth muscle cells. In vitro, ex vivo, and in vivo studies demonstrate that medin enhances the abundance of reactive oxygen species and reactive nitrogen species produced by both endothelial cells and vascular smooth muscle cells and promotes vascular endothelial dysfunction and arterial stiffening. Immunostaining and immunoblotting analyses of human samples indicate that the levels of medin are increased in the pathogenesis of aortic aneurysm/dissection, temporal arteritis, and cerebrovascular dementia. Thus, medin peptide could be targeted as a biomarker diagnostic tool or as a potential molecular approach to curbing the arterial degenerative inflammatory remodeling that accompanies aging and disease.
Collapse
|
9
|
Hossack M, Fisher R, Torella F, Madine J, Field M, Akhtar R. Micromechanical and Ultrastructural Properties of Abdominal Aortic Aneurysms. Artery Res 2022. [DOI: 10.1007/s44200-022-00011-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
AbstractAbdominal aortic aneurysms are a common condition of uncertain pathogenesis that can rupture if left untreated. Current recommended thresholds for planned repair are empirical and based entirely on diameter. It has been observed that some aneurysms rupture before reaching the threshold for repair whilst other larger aneurysms do not rupture. It is likely that geometry is not the only factor influencing rupture risk. Biomechanical indices aiming to improve and personalise rupture risk prediction require, amongst other things, knowledge of the material properties of the tissue and realistic constitutive models. These depend on the composition and organisation of the vessel wall which has been shown to undergo drastic changes with aneurysmal degeneration, with loss of elastin, smooth muscle cells, and an accumulation of isotropically arranged collagen. Most aneurysms are lined with intraluminal thrombus, which has an uncertain effect on the underlying vessel wall, with some authors demonstrating a reduction in wall stress and others a reduction in wall strength. The majority of studies investigating biomechanical properties of ex vivo abdominal aortic aneurysm tissues have used low-resolution techniques, such as tensile testing, able to measure the global material properties at the macroscale. High-resolution engineering techniques such as nanoindentation and atomic force microscopy have been modified for use in soft biological tissues and applied to vascular tissues with promising results. These techniques have the potential to advance the understanding and improve the management of abdominal aortic aneurysmal disease.
Collapse
|
10
|
Wagner J, Degenhardt K, Veit M, Louros N, Konstantoulea K, Skodras A, Wild K, Liu P, Obermüller U, Bansal V, Dalmia A, Häsler LM, Lambert M, De Vleeschouwer M, Davies HA, Madine J, Kronenberg-Versteeg D, Feederle R, Del Turco D, Nilsson KPR, Lashley T, Deller T, Gearing M, Walker LC, Heutink P, Rousseau F, Schymkowitz J, Jucker M, Neher JJ. Medin co-aggregates with vascular amyloid-β in Alzheimer's disease. Nature 2022; 612:123-131. [PMID: 36385530 PMCID: PMC9712113 DOI: 10.1038/s41586-022-05440-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 10/12/2022] [Indexed: 11/17/2022]
Abstract
Aggregates of medin amyloid (a fragment of the protein MFG-E8, also known as lactadherin) are found in the vasculature of almost all humans over 50 years of age1,2, making it the most common amyloid currently known. We recently reported that medin also aggregates in blood vessels of ageing wild-type mice, causing cerebrovascular dysfunction3. Here we demonstrate in amyloid-β precursor protein (APP) transgenic mice and in patients with Alzheimer's disease that medin co-localizes with vascular amyloid-β deposits, and that in mice, medin deficiency reduces vascular amyloid-β deposition by half. Moreover, in both the mouse and human brain, MFG-E8 is highly enriched in the vasculature and both MFG-E8 and medin levels increase with the severity of vascular amyloid-β burden. Additionally, analysing data from 566 individuals in the ROSMAP cohort, we find that patients with Alzheimer's disease have higher MFGE8 expression levels, which are attributable to vascular cells and are associated with increased measures of cognitive decline, independent of plaque and tau pathology. Mechanistically, we demonstrate that medin interacts directly with amyloid-β to promote its aggregation, as medin forms heterologous fibrils with amyloid-β, affects amyloid-β fibril structure, and cross-seeds amyloid-β aggregation both in vitro and in vivo. Thus, medin could be a therapeutic target for prevention of vascular damage and cognitive decline resulting from amyloid-β deposition in the blood vessels of the brain.
Collapse
Affiliation(s)
- Jessica Wagner
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany ,grid.10392.390000 0001 2190 1447Department of Cellular Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany ,grid.10392.390000 0001 2190 1447Graduate School of Cellular and Molecular Neuroscience, University of Tübingen, Tübingen, Germany
| | - Karoline Degenhardt
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany ,grid.10392.390000 0001 2190 1447Department of Cellular Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany ,grid.10392.390000 0001 2190 1447Graduate School of Cellular and Molecular Neuroscience, University of Tübingen, Tübingen, Germany
| | - Marleen Veit
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany ,grid.10392.390000 0001 2190 1447Department of Cellular Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany ,grid.10392.390000 0001 2190 1447Graduate School of Cellular and Molecular Neuroscience, University of Tübingen, Tübingen, Germany
| | - Nikolaos Louros
- grid.511015.1Switch Laboratory, VIB-KU Leuven Center for Brain and Disease Research, Leuven, Belgium ,grid.5596.f0000 0001 0668 7884Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Katerina Konstantoulea
- grid.511015.1Switch Laboratory, VIB-KU Leuven Center for Brain and Disease Research, Leuven, Belgium ,grid.5596.f0000 0001 0668 7884Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Angelos Skodras
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany ,grid.10392.390000 0001 2190 1447Department of Cellular Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Katleen Wild
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Ping Liu
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany ,grid.10392.390000 0001 2190 1447Department of Cellular Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany ,grid.10392.390000 0001 2190 1447Graduate School of Cellular and Molecular Neuroscience, University of Tübingen, Tübingen, Germany
| | - Ulrike Obermüller
- grid.10392.390000 0001 2190 1447Department of Cellular Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Vikas Bansal
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Anupriya Dalmia
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Lisa M. Häsler
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany ,grid.10392.390000 0001 2190 1447Department of Cellular Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Marius Lambert
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany ,grid.10392.390000 0001 2190 1447Department of Cellular Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Matthias De Vleeschouwer
- grid.511015.1Switch Laboratory, VIB-KU Leuven Center for Brain and Disease Research, Leuven, Belgium ,grid.5596.f0000 0001 0668 7884Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Hannah A. Davies
- grid.10025.360000 0004 1936 8470Department of Cardiovascular and Metabolic Medicine, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, UK ,grid.10025.360000 0004 1936 8470Liverpool Centre for Cardiovascular Sciences, University of Liverpool, Liverpool, UK
| | - Jillian Madine
- grid.10025.360000 0004 1936 8470Liverpool Centre for Cardiovascular Sciences, University of Liverpool, Liverpool, UK ,grid.10025.360000 0004 1936 8470Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, UK
| | - Deborah Kronenberg-Versteeg
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany ,grid.10392.390000 0001 2190 1447Department of Cellular Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Regina Feederle
- grid.4567.00000 0004 0483 2525Monoclonal Antibody Core Facility, Institute for Diabetes and Obesity, Helmholtz Zentrum München, Research Center for Environmental Health, Neuherberg, Germany ,grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
| | - Domenico Del Turco
- grid.7839.50000 0004 1936 9721Institute of Clinical Neuroanatomy, Dr. Senckenberg Anatomy, Neuroscience Center, Goethe University, Frankfurt/Main, Germany
| | - K. Peter R. Nilsson
- grid.5640.70000 0001 2162 9922Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden
| | - Tammaryn Lashley
- grid.83440.3b0000000121901201Queen Square Brain Bank for Neurological Disorders, University College London Queen Square Institute of Neurology, London, UK ,grid.83440.3b0000000121901201Department of Neurodegenerative Disease, University College London Queen Square Institute of Neurology, London, UK
| | - Thomas Deller
- grid.7839.50000 0004 1936 9721Institute of Clinical Neuroanatomy, Dr. Senckenberg Anatomy, Neuroscience Center, Goethe University, Frankfurt/Main, Germany
| | - Marla Gearing
- grid.189967.80000 0001 0941 6502Department of Pathology and Laboratory Medicine and Department of Neurology, Emory University School of Medicine, Atlanta, GA USA
| | - Lary C. Walker
- grid.189967.80000 0001 0941 6502Department of Neurology and Emory National Primate Research Center, Emory University, Atlanta, GA USA
| | - Peter Heutink
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany
| | - Frederic Rousseau
- grid.511015.1Switch Laboratory, VIB-KU Leuven Center for Brain and Disease Research, Leuven, Belgium ,grid.5596.f0000 0001 0668 7884Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Joost Schymkowitz
- grid.511015.1Switch Laboratory, VIB-KU Leuven Center for Brain and Disease Research, Leuven, Belgium ,grid.5596.f0000 0001 0668 7884Switch Laboratory, Department of Cellular and Molecular Medicine, KU Leuven, Leuven, Belgium
| | - Mathias Jucker
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany ,grid.10392.390000 0001 2190 1447Department of Cellular Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Jonas J. Neher
- grid.424247.30000 0004 0438 0426German Center for Neurodegenerative Diseases (DZNE), Tübingen, Germany ,grid.10392.390000 0001 2190 1447Department of Cellular Neurology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| |
Collapse
|
11
|
Tasaki M, Lavatelli F, Obici L, Obayashi K, Miyamoto T, Merlini G, Palladini G, Ando Y, Ueda M. Age-related amyloidosis outside the brain: A state-of-the-art review. Ageing Res Rev 2021; 70:101388. [PMID: 34116224 DOI: 10.1016/j.arr.2021.101388] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 03/26/2021] [Accepted: 06/04/2021] [Indexed: 02/01/2023]
Abstract
Inside and outside the brain, accumulation of amyloid fibrils plays key roles in the pathogenesis of fatal age-related diseases such as Alzheimer's and Parkinson's diseases and wild-type transthyretin amyloidosis. Although the incidence of all amyloidoses increases with age, for some types of amyloidosis aging is known as the main direct risk factor, and these types are typically diseases of elderly people. More than 10 different precursor proteins are known to cause age-associated amyloidosis; these proteins include amyloid β protein, α-synuclein, transthyretin, islet amyloid polypeptide, atrial natriuretic factor, and the newly discovered epidermal growth factor-containing fibulin-like extracellular matrix protein 1. Except for intracerebral amyloidoses, most age-related amyloidoses have been little studied. Indeed, in view of the increasing life expectancy in our societies, understanding how aging is involved in the process of amyloid fibril accumulation and the effects of amyloid deposits on the aging body is extremely important. In this review, we summarize current knowledge about the nature of amyloid precursor proteins, the prevalence, clinical manifestations, and pathogenesis of amyloidosis, and recent advances in our understanding of age-related amyloidoses outside the brain.
Collapse
|
12
|
Campisi S, Jayendiran R, Condemi F, Viallon M, Croisille P, Avril S. Significance of Hemodynamics Biomarkers, Tissue Biomechanics and Numerical Simulations in the Pathogenesis of Ascending Thoracic Aortic Aneurysms. Curr Pharm Des 2021; 27:1890-1898. [PMID: 33319666 DOI: 10.2174/1381612826999201214231648] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 11/06/2020] [Indexed: 11/22/2022]
Abstract
Guidelines for the treatment of aortic wall diseases are based on measurements of maximum aortic diameter. However, aortic rupture or dissections do occur for small aortic diameters. Growing scientific evidence underlines the importance of biomechanics and hemodynamics in aortic disease development and progression. Wall shear stress (WWS) is an important hemodynamics marker that depends on aortic wall morphology and on the aortic valve function. WSS could be helpful to interpret aortic wall remodeling and define personalized risk criteria. The complementarity of Computational Fluid Dynamics and 4D Magnetic Resonance Imaging as tools for WSS assessment is a promising reality. The potentiality of these innovative technologies will provide maps or atlases of hemodynamics biomarkers to predict aortic tissue dysfunction. Ongoing efforts should focus on the correlation between these non-invasive imaging biomarkers and clinico-pathologic situations for the implementation of personalized medicine in current clinical practice.
Collapse
Affiliation(s)
- Salvatore Campisi
- Department of Cardiovascular Surgery; University Hospistal of Saint Etienne, France
| | - Raja Jayendiran
- Mines Saint-Etienne, Univ Lyon, Univ Jean Monnet, INSERM, U 1059 Sainbiose, Centre CIS, F - 42023 Saint-Etienne, France
| | - Francesca Condemi
- Mines Saint-Etienne, Univ Lyon, Univ Jean Monnet, INSERM, U 1059 Sainbiose, Centre CIS, F - 42023 Saint-Etienne, France
| | - Magalie Viallon
- Department of Radiology, University Hospital of Saint Etienne, France
| | - Pierre Croisille
- Department of Radiology, University Hospital of Saint Etienne, France
| | - Stéphane Avril
- Mines Saint-Etienne, Univ Lyon, Univ Jean Monnet, INSERM, U 1059 Sainbiose, Centre CIS, F - 42023 Saint-Etienne, France
| |
Collapse
|
13
|
Kim SH, Monticone RE, McGraw KR, Wang M. Age-associated proinflammatory elastic fiber remodeling in large arteries. Mech Ageing Dev 2021; 196:111490. [PMID: 33839189 PMCID: PMC8154723 DOI: 10.1016/j.mad.2021.111490] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 03/24/2021] [Accepted: 04/05/2021] [Indexed: 12/12/2022]
Abstract
Elastic fibers are the main components of the extracellular matrix of the large arterial wall. Elastic fiber remodeling is an intricate process of synthesis and degradation of the core elastin protein and microfibrils accompanied by the assembly and disassembly of accessory proteins. Age-related morphological, structural, and functional proinflammatory remodeling within the elastic fiber has a profound effect upon the integrity, elasticity, calcification, amyloidosis, and stiffness of the large arterial wall. An age-associated increase in arterial stiffness is a major risk factor for the pathogenesis of diseases of the large arteries such as hypertensive and atherosclerotic vasculopathy. This mini review is an update on the key molecular, cellular, functional, and structural mechanisms of elastic fiber proinflammatory remodeling in large arteries with aging. Targeting structural and functional integrity of the elastic fiber may be an effective approach to impede proinflammatory arterial remodeling with advancing age.
Collapse
Affiliation(s)
- Soo Hyuk Kim
- Laboratory of Cardiovascular Science, Intramural Research Program, National Institution on Aging, National Institutes of Health, Biomedical Research Center (BRC), 251 Bayview Boulevard, Baltimore, MD, 21224, USA
| | - Robert E Monticone
- Laboratory of Cardiovascular Science, Intramural Research Program, National Institution on Aging, National Institutes of Health, Biomedical Research Center (BRC), 251 Bayview Boulevard, Baltimore, MD, 21224, USA
| | - Kimberly R McGraw
- Laboratory of Cardiovascular Science, Intramural Research Program, National Institution on Aging, National Institutes of Health, Biomedical Research Center (BRC), 251 Bayview Boulevard, Baltimore, MD, 21224, USA
| | - Mingyi Wang
- Laboratory of Cardiovascular Science, Intramural Research Program, National Institution on Aging, National Institutes of Health, Biomedical Research Center (BRC), 251 Bayview Boulevard, Baltimore, MD, 21224, USA.
| |
Collapse
|
14
|
Davies HA, Caamano-Gutierrez E, Sarsby J, Nawaytou O, Harky A, Akhtar R, Field M, Madine J. Exploring the potential of rapid evaporative ionization mass spectrometry (Intelligent Knife) for point-of-care testing in aortic surgery. Eur J Cardiothorac Surg 2021; 60:562-568. [PMID: 33842942 PMCID: PMC8434870 DOI: 10.1093/ejcts/ezab166] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 02/09/2021] [Accepted: 02/24/2021] [Indexed: 01/16/2023] Open
Abstract
OBJECTIVES Many intraoperative decisions regarding the extent of thoracic aortic surgery are subjective and are based on the appearance of the aorta, perceived surgical risks and likelihood of early recurrent disease. Our objective in this work was to carry out a cross-sectional study to demonstrate that rapid evaporative ionization mass spectrometry (REIMS) of electrosurgical aerosol is able to empirically discriminate ex vivo aneurysmal human thoracic aorta from normal aorta, thus providing supportive evidence for the development of the technique as a point-of-care test guiding intraoperative surgical decision-making. METHODS Human aortic tissue was obtained from patients undergoing surgery for thoracic aortic aneurysms (n = 44). Normal aorta was obtained from a mixture of post-mortem and punch biopsies from patients undergoing coronary surgery (n = 13). Monopolar electrocautery was applied to samples and surgical aerosol aspirated and analysed by REIMS to produce mass spectral data. RESULTS Models generated from REIMS data can discriminate aneurysmal from normal aorta with accuracy and precision of 88.7% and 85.1%, respectively. In addition, further analysis investigating aneurysmal tissue from patients with bicuspid and tricuspid aortic valves was discriminated from normal tissue and each other with accuracies and precision of 93.5% and 91.4% for control, 83.8% and 76.7% for bicuspid aortic valve and 89.3% and 86.0% for tricuspid aortic valve, respectively. CONCLUSIONS Analysis of electrosurgical aerosol from ex vivo aortic tissue using REIMS allowed us to discriminate aneurysmal from normal aorta, supporting its development as a point-of-care test (Intelligent Knife) for guiding surgical intraoperative decision-making.
Collapse
Affiliation(s)
- Hannah A Davies
- Department of Cardiovascular and Metabolic Medicine, Institute of Life Course and Medical sciences, Faculty of Health and Life Sciences, University of Liverpool, Liverpool, UK.,Liverpool Centre for Cardiovascular Science, Liverpool, UK
| | - Eva Caamano-Gutierrez
- Computational Biology Facility, Technology Directorate, Faculty of Health and Life Sciences, University of Liverpool, Liverpool, UK.,Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, Faculty of Health and Life Sciences, University of Liverpool, Liverpool, UK
| | - Joscelyn Sarsby
- Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, Faculty of Health and Life Sciences, University of Liverpool, Liverpool, UK.,Centre for Proteomic Research, Institute of Systems, Molecular and Integrative Biology, Faculty of Health and Life Sciences, University of Liverpool, Liverpool, UK
| | - Omar Nawaytou
- Liverpool Centre for Cardiovascular Science, Liverpool, UK.,Department of Cardiac Surgery, Liverpool Heart and Chest Hospital, Liverpool, UK
| | - Amer Harky
- Liverpool Centre for Cardiovascular Science, Liverpool, UK.,Department of Cardiac Surgery, Liverpool Heart and Chest Hospital, Liverpool, UK
| | - Riaz Akhtar
- Liverpool Centre for Cardiovascular Science, Liverpool, UK.,Department of Mechanical, Materials and Aerospace Engineering, School of Engineering, University of Liverpool, UK
| | - Mark Field
- Liverpool Centre for Cardiovascular Science, Liverpool, UK.,Department of Cardiac Surgery, Liverpool Heart and Chest Hospital, Liverpool, UK
| | - Jillian Madine
- Liverpool Centre for Cardiovascular Science, Liverpool, UK.,Department of Biochemistry and Systems Biology, Institute of Systems, Molecular and Integrative Biology, Faculty of Health and Life Sciences, University of Liverpool, Liverpool, UK
| |
Collapse
|
15
|
Medin aggregation causes cerebrovascular dysfunction in aging wild-type mice. Proc Natl Acad Sci U S A 2020; 117:23925-23931. [PMID: 32900929 DOI: 10.1073/pnas.2011133117] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Medin is the most common amyloid known in humans, as it can be found in blood vessels of the upper body in virtually everybody over 50 years of age. However, it remains unknown whether deposition of Medin plays a causal role in age-related vascular dysfunction. We now report that aggregates of Medin also develop in the aorta and brain vasculature of wild-type mice in an age-dependent manner. Strikingly, genetic deficiency of the Medin precursor protein, MFG-E8, eliminates not only vascular aggregates but also prevents age-associated decline of cerebrovascular function in mice. Given the prevalence of Medin aggregates in the general population and its role in vascular dysfunction with aging, targeting Medin may become a novel approach to sustain healthy aging.
Collapse
|
16
|
Migrino RQ, Karamanova N, Truran S, Serrano GE, Davies HA, Madine J, Beach TG. Cerebrovascular medin is associated with Alzheimer's disease and vascular dementia. ALZHEIMER'S & DEMENTIA (AMSTERDAM, NETHERLANDS) 2020; 12:e12072. [PMID: 32875054 PMCID: PMC7447901 DOI: 10.1002/dad2.12072] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 06/18/2020] [Accepted: 06/24/2020] [Indexed: 11/10/2022]
Abstract
INTRODUCTION Medin, an aging-associated amyloidogenic protein, induces cerebrovascular dysfunction and inflammation. We investigated the relationship between cerebrovascular medin and Alzheimer's disease (AD) and vascular dementia (VaD). METHODS Cerebral arteriole medin was quantified from 91 brain donors with no dementia (ND), AD, VaD, or combined AD and VaD. Correlation analyses evaluated the relationship between arteriole medin, and plaques, tangles, or white matter lesions (WML). Receiver operating characteristic and regression analyses assessed whether medin is predictive of AD or VaD versus other cerebrovascular pathologies (circle of Willis [CoW] atherosclerosis and cerebral amyloid angiopathy [CAA]). RESULTS Arteriole medin was higher in those with AD, VaD, or combined AD/VaD versus ND (P < .05), and correlated with tangle, plaque, and WML, but not CAA or CoW atherosclerosis. Among cerebrovascular pathologies, medin was the strongest predictor of AD diagnosis, whereas CoW atherosclerosis and arteriole medin were predictors of VaD. DISCUSSION Cerebral arteriole medin is associated with and could be a potential novel risk factor or biomarker for AD and VaD.
Collapse
Affiliation(s)
- Raymond Q. Migrino
- Phoenix Veterans Affairs Health Care SystemPhoenixArizonaUSA
- University of Arizona College of Medicine‐PhoenixPhoenixArizonaUSA
| | - Nina Karamanova
- Phoenix Veterans Affairs Health Care SystemPhoenixArizonaUSA
| | - Seth Truran
- Phoenix Veterans Affairs Health Care SystemPhoenixArizonaUSA
| | | | | | | | | |
Collapse
|
17
|
Younger S, Jang H, Davies HA, Niemiec MJ, Garcia JGN, Nussinov R, Migrino RQ, Madine J, Arce FT. Medin Oligomer Membrane Pore Formation: A Potential Mechanism of Vascular Dysfunction. Biophys J 2020; 118:2769-2782. [PMID: 32402244 PMCID: PMC7264854 DOI: 10.1016/j.bpj.2020.04.026] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 04/11/2020] [Accepted: 04/17/2020] [Indexed: 12/12/2022] Open
Abstract
Medin, a 50-amino-acid cleavage product of the milk fat globule-EGF factor 8 protein, is one of the most common forms of localized amyloid found in the vasculature of individuals older than 50 years. Medin induces endothelial dysfunction and vascular inflammation, yet despite its prevalence in the human aorta and multiple arterial beds, little is known about the nature of its pathology. Medin oligomers have been implicated in the pathology of aortic aneurysm, aortic dissection, and more recently, vascular dementia. Recent in vitro biomechanical measurements found increased oligomer levels in aneurysm patients with altered aortic wall integrity. Our results suggest an oligomer-mediated toxicity mechanism for medin pathology. Using lipid bilayer electrophysiology, we show that medin oligomers induce ionic membrane permeability by pore formation. Pore activity was primarily observed for preaggregated medin species from the growth-phase and rarely for lag-phase species. Atomic force microscopy (AFM) imaging of medin aggregates at different stages of aggregation revealed the gradual formation of flat domains resembling the morphology of supported lipid bilayers. Transmission electron microscopy images showed the coexistence of compact oligomers, largely consistent with the AFM data, and larger protofibrillar structures. Circular dichroism spectroscopy revealed the presence of largely disordered species and suggested the presence of β-sheets. This observation and the significantly lower thioflavin T fluorescence emitted by medin aggregates compared to amyloid-β fibrils, along with the absence of amyloid fibers in the AFM and transmission electron microscopy images, suggest that medin aggregation into pores follows a nonamyloidogenic pathway. In silico modeling by molecular dynamics simulations provides atomic-level structural detail of medin pores with the CNpNC barrel topology and diameters comparable to values estimated from experimental pore conductances.
Collapse
Affiliation(s)
- Scott Younger
- Department of Biomedical Engineering, University of Arizona, Tucson, Arizona
| | - Hyunbum Jang
- Computational Structural Biology Section, Basic Science Program, Frederick National Laboratory for Cancer Research, Frederick, Maryland
| | - Hannah A Davies
- Institute of Integrative Biology, University of Liverpool, Liverpool, United Kingdom
| | - Martin J Niemiec
- Department of Biomedical Engineering, University of Arizona, Tucson, Arizona
| | - Joe G N Garcia
- Department of Medicine, University of Arizona, Tucson, Arizona
| | - Ruth Nussinov
- Computational Structural Biology Section, Basic Science Program, Frederick National Laboratory for Cancer Research, Frederick, Maryland; Department of Human Molecular Genetics and Biochemistry, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Raymond Q Migrino
- Office of Research, Phoenix Veterans Affairs Health Care System, Phoenix, Arizona; Department of Medicine, University of Arizona College of Medicine-Phoenix, Arizona
| | - Jillian Madine
- Institute of Integrative Biology, University of Liverpool, Liverpool, United Kingdom
| | - Fernando T Arce
- Department of Biomedical Engineering, University of Arizona, Tucson, Arizona; Department of Medicine, University of Arizona, Tucson, Arizona.
| |
Collapse
|