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Hirschberg Y, Boonen K, Schildermans K, van Dam A, Pintelon I, Vandendriessche C, Velimirovic M, Jacobs A, Vandenbroucke RE, Nelissen I, Vermeiren Y, Mertens I. Characterising extracellular vesicles from individual low volume cerebrospinal fluid samples, isolated by SmartSEC. JOURNAL OF EXTRACELLULAR BIOLOGY 2022; 1:e55. [PMID: 38938772 PMCID: PMC11080878 DOI: 10.1002/jex2.55] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 07/15/2022] [Accepted: 07/19/2022] [Indexed: 06/29/2024]
Abstract
Extracellular vesicles (EVs) are suggested to have a role in the progression of neurodegeneration, and are able to transmit pathological proteins from one cell to another. One of the biofluids from which EVs can be isolated is cerebrospinal fluid (CSF). However, so far, few studies have been performed on small volumes of CSF. Since pooling of patient samples possibly leads to the loss of essential individual patient information, and CSF samples are precious, it is important to have efficient techniques for the isolation of EVs from smaller volumes. In this study, the SmartSEC HT isolation kit from System Biosciences has been evaluated for this purpose. The SmartSEC HT isolation kit was used for isolation of EVs from 500 μL starting volumes of CSF, resulting in two possible EV fractions of 500 μL. Both fractions were characterised and compared to one another using a whole range of characterisation techniques. Results indicated the presence of EVs in both fractions, albeit fraction 1 showed more reproducible results over the different characterisation methods. For example, CMG (CellMask Green membrane stain) fluorescence nanotracking analysis (NTA), ExoView, and the particles/μg ratio demonstrated a clear difference between fraction 1 and 2, where fraction 1 came out as the one where most EVs were eluted with the least contamination. In the other methods, this difference was less noticeable. We successfully performed complementary characterisation tests using only 500 μL of CSF starting volume, and, conclude that fraction 1 consisted of sufficiently pure EVs for further biomarker studies. This means that future EV extractions may be based upon smaller CSF quantities, such as from individual patients. In that way, patient samples do not have to be pooled and individual patient information can be included in forthcoming studies, potentially linking EV content, size and distribution to individualised neurological diagnoses.
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Affiliation(s)
- Yael Hirschberg
- Health UnitFlemish Institute for Technological Research (VITO)MolBelgium
- Centre for Proteomics (CfP)University of AntwerpAntwerpBelgium
| | - Kurt Boonen
- Health UnitFlemish Institute for Technological Research (VITO)MolBelgium
- Centre for Proteomics (CfP)University of AntwerpAntwerpBelgium
| | - Karin Schildermans
- Health UnitFlemish Institute for Technological Research (VITO)MolBelgium
- Centre for Proteomics (CfP)University of AntwerpAntwerpBelgium
| | - Annemieke van Dam
- Biomedical Engineering and PhysicsAmsterdam UMCAmsterdamThe Netherlands
| | - Isabel Pintelon
- Department of Veterinary SciencesUniversity of AntwerpAntwerpBelgium
| | - Charysse Vandendriessche
- VIB Center for Inflammation ResearchVIBGhentBelgium
- Department of Biomedical Molecular BiologyGhent UniversityGhentBelgium
| | - Milica Velimirovic
- Department of ChemistryAtomic & Mass SpectrometryGhent UniversityGhentBelgium
- Sustainable ChemistryFlemish Institute for Technological Research (VITO)MolBelgium
| | - An Jacobs
- Health UnitFlemish Institute for Technological Research (VITO)MolBelgium
| | - Roosmarijn E. Vandenbroucke
- VIB Center for Inflammation ResearchVIBGhentBelgium
- Department of Biomedical Molecular BiologyGhent UniversityGhentBelgium
| | - Inge Nelissen
- Health UnitFlemish Institute for Technological Research (VITO)MolBelgium
| | - Yannick Vermeiren
- Faculty of Medicine & Health SciencesTranslational NeurosciencesUniversity of AntwerpAntwerpBelgium
- Division of Human Nutrition and HealthChair group of Nutritional BiologyWageningen University & Research (WUR)WageningenThe Netherlands
| | - Inge Mertens
- Health UnitFlemish Institute for Technological Research (VITO)MolBelgium
- Centre for Proteomics (CfP)University of AntwerpAntwerpBelgium
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2
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Waldie S, Sebastiani F, Moulin M, Del Giudice R, Paracini N, Roosen-Runge F, Gerelli Y, Prevost S, Voss JC, Darwish TA, Yepuri N, Pichler H, Maric S, Forsyth VT, Haertlein M, Cárdenas M. ApoE and ApoE Nascent-Like HDL Particles at Model Cellular Membranes: Effect of Protein Isoform and Membrane Composition. Front Chem 2021; 9:630152. [PMID: 33996741 PMCID: PMC8117676 DOI: 10.3389/fchem.2021.630152] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Accepted: 03/30/2021] [Indexed: 11/13/2022] Open
Abstract
Apolipoprotein E (ApoE), an important mediator of lipid transportation in plasma and the nervous system, plays a large role in diseases such as atherosclerosis and Alzheimer's. The major allele variants ApoE3 and ApoE4 differ only by one amino acid. However, this difference has major consequences for the physiological behaviour of each variant. In this paper, we follow (i) the initial interaction of lipid-free ApoE variants with model membranes as a function of lipid saturation, (ii) the formation of reconstituted High-Density Lipoprotein-like particles (rHDL) and their structural characterisation, and (iii) the rHDL ability to exchange lipids with model membranes made of saturated lipids in the presence and absence of cholesterol [1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC) or 1-palmitoyl-2-oleoyl-glycero-3-phosphocholine (POPC) with and without 20 mol% cholesterol]. Our neutron reflection results demonstrate that the protein variants interact differently with the model membranes, adopting different protein conformations. Moreover, the ApoE3 structure at the model membrane is sensitive to the level of lipid unsaturation. Small-angle neutron scattering shows that the ApoE containing lipid particles form elliptical disc-like structures, similar in shape but larger than nascent or discoidal HDL based on Apolipoprotein A1 (ApoA1). Neutron reflection shows that ApoE-rHDL do not remove cholesterol but rather exchange saturated lipids, as occurs in the brain. In contrast, ApoA1-containing particles remove and exchange lipids to a greater extent as occurs elsewhere in the body.
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Affiliation(s)
- Sarah Waldie
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden.,Institut Laue-Langevin, Grenoble, France.,Partnership for Structural Biology (PSB), Grenoble, France
| | - Federica Sebastiani
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Martine Moulin
- Institut Laue-Langevin, Grenoble, France.,Partnership for Structural Biology (PSB), Grenoble, France
| | - Rita Del Giudice
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Nicolò Paracini
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Felix Roosen-Runge
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
| | - Yuri Gerelli
- Institut Laue-Langevin, Grenoble, France.,Department of Life and Environmental Sciences, Marche Polytechnic University, Ancona, Italy
| | | | - John C Voss
- Department of Biochemistry and Molecular Medicine, University of California, Davis, Davis, CA, United States
| | - Tamim A Darwish
- National Deuteration Facility, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia
| | - Nageshwar Yepuri
- National Deuteration Facility, Australian Nuclear Science and Technology Organisation, Lucas Heights, NSW, Australia
| | - Harald Pichler
- Austrian Centre of Industrial Biotechnology, Graz, Austria.,Graz University of Technology, Institute of Molecular Biotechnology, NAWI Graz, BioTechMed Graz, Graz, Austria
| | | | - V Trevor Forsyth
- Institut Laue-Langevin, Grenoble, France.,Partnership for Structural Biology (PSB), Grenoble, France.,Faculty of Natural Sciences, Keele University, Staffordshire, United Kingdom
| | - Michael Haertlein
- Institut Laue-Langevin, Grenoble, France.,Partnership for Structural Biology (PSB), Grenoble, France
| | - Marité Cárdenas
- Department of Biomedical Science and Biofilms-Research Center for Biointerfaces, Malmö University, Malmö, Sweden
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3
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Lipoprotein ability to exchange and remove lipids from model membranes as a function of fatty acid saturation and presence of cholesterol. Biochim Biophys Acta Mol Cell Biol Lipids 2020; 1865:158769. [PMID: 32712249 DOI: 10.1016/j.bbalip.2020.158769] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 05/11/2020] [Accepted: 07/19/2020] [Indexed: 11/23/2022]
Abstract
Lipoproteins play a central role in the development of atherosclerosis. High and low-density lipoproteins (HDL and LDL), known as 'good' and 'bad' cholesterol, respectively, remove and/or deposit lipids into the artery wall. Hence, insight into lipid exchange processes between lipoproteins and cell membranes is of particular importance in understanding the onset and development of cardiovascular disease. In order to elucidate the impact of phospholipid tail saturation and the presence of cholesterol in cell membranes on these processes, neutron reflection was employed in the present investigation to follow lipid exchange with both HDL and LDL against model membranes. Mirroring clinical risk factors for the development of atherosclerosis, lower exchange was observed in the presence of cholesterol, as well as for an unsaturated phospholipid, compared to faster exchange when using a fully saturated phospholipid. These results highlight the importance of membrane composition on the interaction with lipoproteins, chiefly the saturation level of the lipids and presence of cholesterol, and provide novel insight into factors of importance for build-up and reversibility of atherosclerotic plaque. In addition, the correlation between the results and well-established clinical risk factors suggests that the approach taken can be employed also for understanding a broader set of risk factors including, e.g., effects of triglycerides and oxidative stress, as well as local effects of drugs on atherosclerotic plaque formation.
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4
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Abstract
A polar head and an apolar tail chemically characterize surfactants, they show different properties and are categorized by different factors such as head charge and molecular weight. They work by reducing the surface tension between oil and water phases to facilitate the formation of one homogeneous mixture. In this respect, they represent unavoidable ingredients, their main application is in the production of detergents, one of if not the most important categories of cosmetics. Their role is very important, it should be remembered that it was precisely soaps and hygiene that defeated the main infectious diseases at the beginning of the last century. Due to their positive environmental impact, the potential uses of microbial sourced surfactants are actively investigated. These compounds are produced with different mechanisms by microorganisms in the aims to defend themselves from external threats, to improve the mobility in the environment, etc. In the cosmetic field, biosurfactants, restricted in the present work to those described above, can carry high advantages, in comparison to traditional surfactants, especially in the field of sustainable and safer approaches. Besiede this, costs still remain an obsatcle to their diffusion; in this regard, exploration of possible multifunctional actions could help to contain application costs. To highlight their features and possible multifunctional role, on the light of specific biological profiles yet underestimated, we have approached the present review work.
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5
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Synthesis of boronated meso-arylporphyrins via copper-catalyzed 1,3-dipolar cycloaddition reaction and their binding ability towards albumin and low density lipoproteins. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121248] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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6
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Low-density lipoprotein mimics blood plasma-derived exosomes and microvesicles during isolation and detection. Sci Rep 2016; 6:24316. [PMID: 27087061 PMCID: PMC4834552 DOI: 10.1038/srep24316] [Citation(s) in RCA: 346] [Impact Index Per Article: 43.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2016] [Accepted: 03/21/2016] [Indexed: 12/11/2022] Open
Abstract
Circulating extracellular vesicles have emerged as potential new biomarkers in a wide variety of diseases. Despite the increasing interest, their isolation and purification from body fluids remains challenging. Here we studied human pre-prandial and 4 hours postprandial platelet-free blood plasma samples as well as human platelet concentrates. Using flow cytometry, we found that the majority of circulating particles within the size range of extracellular vesicles lacked common vesicular markers. We identified most of these particles as lipoproteins (predominantly low-density lipoprotein, LDL) which mimicked the characteristics of extracellular vesicles and also co-purified with them. Based on biophysical properties of LDL this finding was highly unexpected. Current state-of-the-art extracellular vesicle isolation and purification methods did not result in lipoprotein-free vesicle preparations from blood plasma or from platelet concentrates. Furthermore, transmission electron microscopy showed an association of LDL with isolated vesicles upon in vitro mixing. This is the first study to show co-purification and in vitro association of LDL with extracellular vesicles and its interference with vesicle analysis. Our data point to the importance of careful study design and data interpretation in studies using blood-derived extracellular vesicles with special focus on potentially co-purified LDL.
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7
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Kontush A, Lindahl M, Lhomme M, Calabresi L, Chapman MJ, Davidson WS. Structure of HDL: particle subclasses and molecular components. Handb Exp Pharmacol 2015; 224:3-51. [PMID: 25522985 DOI: 10.1007/978-3-319-09665-0_1] [Citation(s) in RCA: 162] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
A molecular understanding of high-density lipoprotein (HDL) will allow a more complete grasp of its interactions with key plasma remodelling factors and with cell-surface proteins that mediate HDL assembly and clearance. However, these particles are notoriously heterogeneous in terms of almost every physical, chemical and biological property. Furthermore, HDL particles have not lent themselves to high-resolution structural study through mainstream techniques like nuclear magnetic resonance and X-ray crystallography; investigators have therefore had to use a series of lower resolution methods to derive a general structural understanding of these enigmatic particles. This chapter reviews current knowledge of the composition, structure and heterogeneity of human plasma HDL. The multifaceted composition of the HDL proteome, the multiple major protein isoforms involving translational and posttranslational modifications, the rapidly expanding knowledge of the HDL lipidome, the highly complex world of HDL subclasses and putative models of HDL particle structure are extensively discussed. A brief history of structural studies of both plasma-derived and recombinant forms of HDL is presented with a focus on detailed structural models that have been derived from a range of techniques spanning mass spectrometry to molecular dynamics.
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Affiliation(s)
- Anatol Kontush
- National Institute for Health and Medical Research (INSERM), UMR-ICAN 1166, Paris, France,
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8
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Takahara EI, Yuasa H, Nishida M, Mantani Y, Udayanga KGS, Qi WM, Takeuchi T, Yokoyama T, Hoshi N, Kitagawa H. Immunohistochemical and histoplanimetrical study on the endothelial receptor involved in transportation of minute chylomicrons into subepithelial portal blood in intestinal villi of the rat jejunum. J Vet Med Sci 2014; 77:387-93. [PMID: 25502363 PMCID: PMC4427738 DOI: 10.1292/jvms.14-0432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
A portion of the minute chylomicrons less than 75 nm in diameter are transcytosed from
the extravascular tissue into the subepithelial blood capillaries (sBC) in the villous
apices of the rat jejunum. However, the details of the transportation mechanism have not
been clarified. In this study, the endothelial receptor involved in the transportation of
minute chylomicrons into the sBC’s lumina was immunohistochemically and
histoplanimetrically examined in intestinal villi of the rat jejunum. Immunopositivity for
very low density lipoprotein (VLDL) receptor was detected on the luminal and basal
surfaces of the endothelial cells of sBC in approximately 68% of those apices of jejunal
villi that possessed numerous chylomicrons in the lamina propria, while VLDL receptor was
detected on the endothelial cells of sBC in only approximately 8% of intestinal villi that
possessed few or no chylomicrons in the lamina propria. No immunopositivity for LDL
receptor was detected in the sBC of all intestinal villi. These findings suggest that VLDL
receptor is expressed by the endothelial cells of the sBC in conjunction with the filling
of the lamina propria of jejunal villi with many chylomicrons produced by the villous
columnar epithelial cells and that the VLDL receptor mediates the transportation of minute
chylomicrons, maybe VLDL, into the subepithelial portal blood from the extravascular
tissue of the rat jejunal villi.
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Affiliation(s)
- Ei-ichirou Takahara
- Laboratory of Histophysiology, Department of Bioresource Science, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo 657-8501, Japan
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9
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Analysis of drug interactions with very low density lipoprotein by high-performance affinity chromatography. Anal Bioanal Chem 2014; 406:6203-11. [PMID: 25103529 DOI: 10.1007/s00216-014-8081-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 07/23/2014] [Accepted: 07/29/2014] [Indexed: 11/30/2022]
Abstract
High-performance affinity chromatography (HPAC) was utilized to examine the binding of very low density lipoprotein (VLDL) with drugs, using R/S-propranolol as a model. These studies indicated that two mechanisms existed for the binding of R- and S-propranolol with VLDL. The first mechanism involved non-saturable partitioning of these drugs with VLDL, which probably occurred with the lipoprotein's non-polar core. This partitioning was described by overall affinity constants of 1.2 (±0.3) × 10(6) M(-1) for R-propranolol and 2.4 (±0.6) × 10(6) M(-1) for S-propranolol at pH 7.4 and 37 °C. The second mechanism occurred through saturable binding by these drugs at fixed sites on VLDL, such as represented by apolipoproteins on the surface of the lipoprotein. The association equilibrium constants for this saturable binding at 37 °C were 7.0 (±2.3) × 10(4) M(-1) for R-propranolol and 9.6 (±2.2) × 10(4) M(-1) for S-propranolol. Comparable results were obtained at 20 and 27 °C for the propranolol enantiomers. This work provided fundamental information on the processes involved in the binding of R- and S-propranolol to VLDL, while also illustrating how HPAC can be used to evaluate relatively complex interactions between agents such as VLDL and drugs or other solutes.
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10
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Takahara EI, Mantani Y, Udayanga KGS, Qi WM, Tanida T, Takeuchi T, Yokoyama T, Hoshi N, Kitagawa H. Ultrastructural demonstration of the absorption and transportation of minute chylomicrons by subepithelial blood capillaries in rat jejunal villi. J Vet Med Sci 2013; 75:1563-9. [PMID: 23892460 PMCID: PMC3942955 DOI: 10.1292/jvms.13-0310] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Chylomicrons from villous columnar epithelial cells are generally known to be
transported only by central lymph vessels (CLV), whereas antigenic particulates derived
from the intestinal lumen can also be transported by subepithelial blood capillaries
(sBCs) in rat intestinal villi. The possibility of chylomicron absorption by sBCs was
histoplanimetrically studied in the rat jejunum under a transmission electron microscope.
The chylomicrons more abundantly presented in villous venules than in arterioles. The most
frequent size (MFS) of chylomicrons was 75 to 90 nm in diameter in the areas near sBCs,
while it was 45 to 60 nm in the epithelial intercellular spaces just above sBCs or the
intermediate areas between sBCs. The MFS of chylomicrons was 45 to 60 nm in the
intermediate areas between sBCs and in the epithelial intercellular spaces just above
these areas. The MFS of chylomicrons in CLV was intermediate between that in the area
adjacent to sBCs and that in the intermediate areas between sBCs. Chylomicrons were found
in small vesicles in the endothelial cytoplasms of sBCs. No chylomicrons larger than 600
nm were observed in the lamina propria. These findings suggest that some of the
chylomicrons smaller than 75 nm, which are probable intestinal very low-density
lipoproteins (VLDL), are directly transported to the liver by hepatic portal blood in
addition to CLV and that epithelial fat droplets larger than 600 nm are not discharged
into lamina propria in rat jejunum under physiological conditions.
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Affiliation(s)
- Ei-Ichirou Takahara
- Department of Bioresource Science, Graduate School of Agricultural Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe, Hyogo 657-8501, Japan
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11
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Sobansky MR, Hage DS. Identification and analysis of stereoselective drug interactions with low-density lipoprotein by high-performance affinity chromatography. Anal Bioanal Chem 2012; 403:563-71. [PMID: 22354572 DOI: 10.1007/s00216-012-5816-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2011] [Revised: 01/21/2012] [Accepted: 01/31/2012] [Indexed: 11/27/2022]
Abstract
Columns containing immobilized low-density lipoprotein (LDL) were prepared for the analysis of drug interactions with this agent by high-performance affinity chromatography (HPAC). R/S-Propranolol was used as a model drug for this study. The LDL columns gave reproducible binding to propranolol over 60 h of continuous use in the presence of pH 7.4 0.067 M potassium phosphate buffer. Experiments conducted with this type of column through frontal analysis indicated that two types of interactions were occurring between R-propranolol and LDL, while only a single type of interaction was observed between S-propranolol and LDL. The first type of interaction, which was seen for both enantiomers, involved non-saturable binding; this interaction had an overall affinity (nK(a)) of 1.9 (±0.1) × 10(5) M(-1) for R-propranolol and 2.7 (±0.2) × 10(5) M(-1) for S-propranolol at 37 °C. The second type of interaction was observed only for R-propranolol and involved saturable binding that had an association equilibrium constant (K(a)) of 5.2 (±2.3) × 10(5) M(-1) at 37 °C. Similar differences in binding behavior were found for the two enantiomers at 20 °C and 27 °C. This is the first known example of stereoselective binding of drugs by LDL or other lipoproteins. This work also illustrates the ability of HPAC to be used as a tool for characterizing mixed-mode interactions that involve LDL and related binding agents.
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Affiliation(s)
- Matthew R Sobansky
- Chemistry Department, University of Nebraska, Lincoln, NE 68588-0304, USA
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12
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Gauthamadasa K, Rosales C, Pownall HJ, Macha S, Jerome WG, Huang R, Silva RAGD. Speciated human high-density lipoprotein protein proximity profiles. Biochemistry 2010; 49:10656-65. [PMID: 21073165 DOI: 10.1021/bi1015452] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
It is expected that the attendant structural heterogeneity of human high-density lipoprotein (HDL) complexes is a determinant of its varied metabolic functions. To determine the structural heterogeneity of HDL, we determined major apolipoprotein stoichiometry profiles in human HDL. First, HDL was separated into two main populations, with and without apolipoprotein (apo) A-II, LpA-I and LpA-I/A-II, respectively. Each main population was further separated into six individual subfractions using size exclusion chromatography (SEC). Protein proximity profiles (PPPs) of major apolipoproteins in each individual subfraction was determined by optimally cross-linking apolipoproteins within individual particles with bis(sulfosuccinimidyl) suberate (BS(3)), a bifunctional cross-linker, followed by molecular mass determination by MALDI-MS. The PPPs of LpA-I subfractions indicated that the number of apoA-I molecules increased from two to three to four with an increase in the LpA-I particle size. On the other hand, the entire population of LpA-I/A-II demonstrated the presence of only two proximal apoA-I molecules per particle, while the number of apoA-II molecules varied from one dimeric apoA-II to two and then to three. For most of the PPPs described above, an additional population that contained a single molecule of apoC-III in addition to apoA-I and/or apoA-II was detected. Upon composition analyses of individual subpopulations, LpA-I/A-II exhibited comparable proportions for total protein (∼58%), phospholipids (∼21%), total cholesterol (∼16%), triglycerides (∼5%), and free cholesterol (∼4%) across subfractions. LpA-I components, on the other hand, showed significant variability. This novel information about HDL subfractions will form a basis for an improved understanding of particle-specific functions of HDL.
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Affiliation(s)
- Kekulawalage Gauthamadasa
- Department of Pathology and Laboratory Medicine, University of Cincinnati, Cincinnati, Ohio 45237, United States
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13
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Impact of lipoproteins on the biological activity and disposition of hydrophobic drugs: implications for drug discovery. Nat Rev Drug Discov 2008; 7:84-99. [DOI: 10.1038/nrd2353] [Citation(s) in RCA: 180] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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14
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Seidah NG, Prat A. The proprotein convertases are potential targets in the treatment of dyslipidemia. J Mol Med (Berl) 2007; 85:685-96. [PMID: 17351764 DOI: 10.1007/s00109-007-0172-7] [Citation(s) in RCA: 125] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2006] [Revised: 01/22/2007] [Accepted: 02/09/2007] [Indexed: 10/23/2022]
Abstract
The family of the secretory proprotein convertases (PCs) comprises seven basic amino acid (aa)-specific subtilisin-like serine proteinases known as PC1/3, PC2, furin, PC4, PC5/6, PACE4 and PC7, and two other PCs, SKI-1 (subtilisin-kexin isozyme-1)/S1P (site-1 protease) and PCSK9 (proprotein convertase subtilisin kexin 9) that cleave at nonbasic residues. Except for the testicular PC4, all the other convertases are expressed in brain and peripheral organs and play a critical role in various functions including the production of diverse neuropeptides as well as growth factors and receptors, the regulation of cellular adhesion/migration, cholesterol and fatty acid homeostasis, and growth/differentiation of progenitor cells. Some of these convertases process proteins that are implicated in pathologies, including cancer malignancies, tissue regeneration, and viral infections. The implication of some of these convertases in sterol/lipid metabolism has only recently been appreciated. SKI-1/S1P activates the synthesis of cholesterol and fatty acids as well as the LDL receptor (LDLR), whereas PCSK9 inactivates the LDLR. Moreover, furin, PC5 and/or, PACE4 inactivates endothelial and lipoprotein lipases. Humans and mice exhibiting either a gain or loss of function of PCSK9 through specific point mutations or knockouts develop hypercholesterolemia and hypocholesterolemia phenotypes, respectively. A PCSK9 inhibitor in combination with statins offers a most promising therapeutic target to treat cardiovascular disorders including dyslipidemias. Specific inhibitors/modulators of the other PCs should find novel therapeutic applications in the control of PC-regulated pathologies.
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Affiliation(s)
- Nabil G Seidah
- Laboratory of Biochemical Neuroendocrinology, Clinical Research Institute of Montreal, 110 Pine Ave West, Montreal, Quebec, H2W 1R7, Canada.
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15
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Pauquai T, Bouchoux J, Chateau D, Vidal R, Rousset M, Chambaz J, Demignot S. Adaptation of enterocytic Caco-2 cells to glucose modulates triacylglycerol-rich lipoprotein secretion through triacylglycerol targeting into the endoplasmic reticulum lumen. Biochem J 2006; 395:393-403. [PMID: 16393142 PMCID: PMC1422772 DOI: 10.1042/bj20051359] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2005] [Revised: 12/13/2005] [Accepted: 01/04/2006] [Indexed: 01/18/2023]
Abstract
Enterocytes are responsible for the absorption of dietary lipids, which involves TRL [TG (triacylglycerol)-rich lipoprotein] assembly and secretion. In the present study, we analysed the effect on TRL secretion of Caco-2 enterocyte adaptation to a differential glucose supply. We showed that TG secretion in cells adapted to a low glucose supply for 2 weeks after confluence was double that of control cells maintained in high-glucose-containing medium, whereas the level of TG synthesis remained similar in both conditions. This increased secretion resulted mainly from an enlargement of the mean size of the secreted TRL. The increased TG availability for TRL assembly and secretion was not due to an increase in the MTP (microsomal TG transfer protein) activity that is required for lipid droplet biogenesis in the ER (endoplasmic reticulum) lumen, or to the channelling of absorbed fatty acids towards the monoacylglycerol pathway for TG synthesis. Interestingly, by electron microscopy and subcellular fractionation studies, we observed, in the low glucose condition, an increase in the TG content available for lipoprotein assembly in the ER lumen, with the cytosolic/microsomal TG levels being verapamil-sensitive. Overall, we demonstrate that Caco-2 enterocytes modulate TRL secretion through TG partitioning between the cytosol and the ER lumen according to the glucose supply. Our model will help in identifying the proteins involved in the control of the balance between TRL assembly and cytosolic lipid storage. This mechanism may be a way for enterocytes to regulate TRL secretion after a meal, and thus impact on our understanding of post-prandial hypertriglyceridaemia.
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Key Words
- apolipoprotein b
- caco-2 cell
- cytosolic lipid droplet
- enterocyte
- lipoprotein secretion
- microsomal triacylglycerol transfer protein (mtp)
- apob, apolipoprotein b
- ba, batyl alcohol
- dgat, diacylglycerol acyltransferase
- dge, diacylglyceryl ether
- dmem, dulbecco's modified eagle's medium
- er, endoplasmic reticulum
- fcs, foetal calf serum
- gpat, glycerolphosphate acyltransferase
- lpc, l-α-lysophosphatidylcholine
- mg, monoacylglycerol
- mgat, mg acyltransferase
- 2-mo, 2-mono-oleoylglycerol
- tg, triacylglycerol
- mtp, microsomal tg transfer protein
- oa, oleic acid
- pdi, protein disulphide-isomerase
- trl, tg-rich lipoprotein
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Affiliation(s)
- Thomas Pauquai
- UMR 505 INSERM-Université Pierre et Marie Curie and Laboratoire de Pharmacologie Cellulaire de l'Ecole Pratique des Hautes Etudes, Centre de Recherches Biomédicales des Cordeliers, 15 rue de l'Ecole de Médecine, 75006 Paris, France
| | - Julien Bouchoux
- UMR 505 INSERM-Université Pierre et Marie Curie and Laboratoire de Pharmacologie Cellulaire de l'Ecole Pratique des Hautes Etudes, Centre de Recherches Biomédicales des Cordeliers, 15 rue de l'Ecole de Médecine, 75006 Paris, France
| | - Danielle Chateau
- UMR 505 INSERM-Université Pierre et Marie Curie and Laboratoire de Pharmacologie Cellulaire de l'Ecole Pratique des Hautes Etudes, Centre de Recherches Biomédicales des Cordeliers, 15 rue de l'Ecole de Médecine, 75006 Paris, France
| | - Romain Vidal
- UMR 505 INSERM-Université Pierre et Marie Curie and Laboratoire de Pharmacologie Cellulaire de l'Ecole Pratique des Hautes Etudes, Centre de Recherches Biomédicales des Cordeliers, 15 rue de l'Ecole de Médecine, 75006 Paris, France
| | - Monique Rousset
- UMR 505 INSERM-Université Pierre et Marie Curie and Laboratoire de Pharmacologie Cellulaire de l'Ecole Pratique des Hautes Etudes, Centre de Recherches Biomédicales des Cordeliers, 15 rue de l'Ecole de Médecine, 75006 Paris, France
| | - Jean Chambaz
- UMR 505 INSERM-Université Pierre et Marie Curie and Laboratoire de Pharmacologie Cellulaire de l'Ecole Pratique des Hautes Etudes, Centre de Recherches Biomédicales des Cordeliers, 15 rue de l'Ecole de Médecine, 75006 Paris, France
| | - Sylvie Demignot
- UMR 505 INSERM-Université Pierre et Marie Curie and Laboratoire de Pharmacologie Cellulaire de l'Ecole Pratique des Hautes Etudes, Centre de Recherches Biomédicales des Cordeliers, 15 rue de l'Ecole de Médecine, 75006 Paris, France
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