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Khongwichit S, Swangphon P, Nanakorn N, Nualla-Ong A, Choowongkomon K, Lieberzeit PA, Chunta S. A simple aptamer/gold nanoparticle aggregation-based colorimetric assay for oxidized low-density lipoprotein determination. Talanta 2023; 254:124199. [PMID: 36549138 DOI: 10.1016/j.talanta.2022.124199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 12/13/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022]
Abstract
Oxidized low-density lipoprotein (oxLDL) is the leading cause of atherosclerosis and cardiovascular diseases. Here, we created a simple colorimetric assay for sensitive and specific determination of oxLDL using a selective aptamer coupled with salt-induced gold nanoparticle (AuNP) aggregation. The aptamer was chosen by Systematic Evolution of Ligands by Exponential Enrichment to obtain a novel selective sequence towards oxLDL (as 5'-CCATCACGGGGCAGGCGGACAAGGGGTAAGGGCCACATCA-3'). Mixing a 5 μM aptamer solution with an aliquot of a sample containing oxLDL followed by adding AuNP solution (OD = 1) and 80 mmol L-1 NaCl achieved rapid results within 19 min: linear response to oxLDL from 0.002 to 0.5 μmol L-1 with high selectivity, a recovery accuracy of 100-111% at the 95% confidence interval, and within-run and between-run precision of 1-6% and 1-5% coefficient variations, respectively. Artificial serum diluted at least 1:8 with distilled water, analyzed by the aptamer-based colorimetric assay, showed excellent correlation with conventional thiobarbituric acid reactive substances (TBARS) (R2 = 0.9792) as a rapid colorimetric method without the need for sample preparation other than dilution.
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Affiliation(s)
- Soemwit Khongwichit
- Prince of Songkla University, Faculty of Medical Technology, Songkhla, 90110, Thailand; Prince of Songkla University, Faculty of Science, Division of Biological Science, Songkhla, 90110, Thailand
| | - Piyawut Swangphon
- Prince of Songkla University, Faculty of Medical Technology, Songkhla, 90110, Thailand
| | - Natthaphon Nanakorn
- Prince of Songkla University, Faculty of Medical Technology, Songkhla, 90110, Thailand
| | - Aekkaraj Nualla-Ong
- Prince of Songkla University, Faculty of Science, Division of Biological Science, Songkhla, 90110, Thailand
| | - Kiattawee Choowongkomon
- Kasetsart University, KU Institute for Advanced Studies Center for Advanced Studies in Nanotechnology for Chemical, Food and Agricultural Industries, Bangkok, 10900, Thailand
| | - Peter A Lieberzeit
- University of Vienna, Faculty for Chemistry, Department of Physical Chemistry, Vienna, 1090, Austria
| | - Suticha Chunta
- Prince of Songkla University, Faculty of Medical Technology, Songkhla, 90110, Thailand.
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Wang Y, Huang X, Yang D, He J, Chen Z, Li K, Liu J, Zhang W. A green-inspired method to prepare non-split high-density lipoprotein (HDL) carrier with anti-dysfunctional activities superior to reconstituted HDL. Eur J Pharm Biopharm 2023; 182:115-127. [PMID: 36529255 DOI: 10.1016/j.ejpb.2022.12.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Revised: 12/06/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022]
Abstract
Numerous studies have demonstrated that dysfunctional high-density lipoprotein (HDL), especially oxidized HDL (OxHDL), could generate multifaceted in vivo proatherogenic effects that run counter to the antiatherogenic activities of HDL. It thereby reminded us that the in vitro reconstituted HDL (rHDL) might encountered with oxidation-induced dysfunction. Accordingly, a green-inspired method was employed to recycle non-split HDL from human plasma fraction IV. Then it was compared with rHDL formulated by an ethanol-injection method in terms of physicochemical properties and anti-dysfunctional activities. Results exhibited that rHDL oxidation extent exceeded that of non-split HDL evidenced by higher malondialdehy content, weaker inhibition on low-density lipoprotein (LDL) oxidation and more superoxide anion. The reserved paraoxonase-1 activity on non-split HDL could partially explain for above experimental results. In the targeted transport mechanism experiment, upon SR-BI receptor inhibition and/or CD36 receptor blockage, the almost unchanged non-split HDL uptake in lipid-laden macrophage indicated its negligible oxidation modification profile with regard to rHDL again. Furthermore, compared to rHDL, better macrophage biofunctions were observed for non-split HDL as illustrated by accelerated cholesterol efflux, inhibited oxidized LDL uptake and lessened cellular lipid accumulation. Along with decreased ROS secretion, obviously weakened oxidative stress damage was also detected under treatment with non-split HDL. More importantly, foam cells with non-split HDL-intervention inspired an enhanced inflammation repression and apoptosis inhibition effect. Collectively, the anti-dysfunctional activities of non-split HDL make it suitable as a potential nanocarrier platform for cardiovascular drug payload and delivery.
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Affiliation(s)
- Yanyan Wang
- Department of Pharmaceutics, China Pharmaceutical University, Nanjing, Jiangsu 210009, PR China
| | - Xinya Huang
- Department of Pharmaceutics, China Pharmaceutical University, Nanjing, Jiangsu 210009, PR China
| | - Danni Yang
- Department of Pharmaceutics, China Pharmaceutical University, Nanjing, Jiangsu 210009, PR China
| | - Jianhua He
- Department of Pharmaceutics, China Pharmaceutical University, Nanjing, Jiangsu 210009, PR China
| | - Zhaoan Chen
- Department of Pharmaceutics, China Pharmaceutical University, Nanjing, Jiangsu 210009, PR China
| | - Kexuan Li
- Department of Pharmaceutics, China Pharmaceutical University, Nanjing, Jiangsu 210009, PR China
| | - Jianping Liu
- Department of Pharmaceutics, China Pharmaceutical University, Nanjing, Jiangsu 210009, PR China.
| | - Wenli Zhang
- Department of Pharmaceutics, China Pharmaceutical University, Nanjing, Jiangsu 210009, PR China.
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Nitrogen-doped carbon dots/Ni-MnFe-layered double hydroxides (N-CDs/Ni-MnFe-LDHs) hybrid nanomaterials as immunoassay label for low-density lipoprotein detection. Mikrochim Acta 2022; 189:72. [PMID: 35075569 DOI: 10.1007/s00604-022-05173-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 01/03/2022] [Indexed: 02/01/2023]
Abstract
Nitrogen-doped carbon dots/Ni-MnFe-layered double hydroxides (N-CDs/Ni-MnFe-LDHs) are demonstrated as superior peroxidase mimic antibody labels alternative to horseradish peroxidase (HRP) in an immunoassay, potentially overcoming some of the inherent disadvantages of HRP and other enzyme mimicking nanomaterials. They revealed efficient peroxidase-like activity and catalyzed the oxidation of colorless 3,3',5,5'-tetramethylbenzidine (TMB) to form the intense blue product (at 620 nm) in the presence of hydrogen peroxide (H2O2). Using low-density lipoprotein (LDL) as a model target, an ultra-low limit of detection (0.0051 mg/dL) and a linear range of 0.0625-0.750 mg/dL were achieved, exhibiting higher sensitivity than the HRP-based immunoassay. Thus, the proposed N-CDs/Ni-MnFe-LDHs can be used as HRP mimicking analogs for developing highly sensitive colorimetric immunosensors for detection of biomarkers, as well as trace chemical analysis.
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Cao J, Lv P, Shu Y, Wang J. Aptamer/AuNPs encoders endow precise identification and discrimination of lipoprotein subclasses. Biosens Bioelectron 2022; 196:113743. [PMID: 34740115 DOI: 10.1016/j.bios.2021.113743] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 10/21/2021] [Accepted: 10/27/2021] [Indexed: 12/29/2022]
Abstract
Lipoproteins are composed of lipid and apolipoproteins in conjunction with noncovalent bonds. Different lipoprotein categories, particularly Low-Density Lipoprotein (LDL), High-Density Lipoprotein (HDL) and Very Low-Density Lipoprotein (VLDL) disagree in roles for the occurrence and development of cardiovascular disease, and their exact discrimination are critically required. Herein, a multiplexed sensor platform combined with an encoder system is introduced for accurate analysis of multiple lipoproteins in complex matrix. Three encoders, i.e., bare AuNPs, AuNPs-anti-LDL aptamer (AuNPs-apt) and AuNPs-non-aptamer DNA (AuNPs-n), facilitate precise discrimination for lipoprotein subclasses at a fairly low level of 0.490 nM. The binding of single-stranded DNA (ssDNA) with AuNPs prevents them from gathering in a relatively higher level of salt. In targets stimuli, the weaker binding between ssDNA and AuNPs is destroyed to certain degrees depending on the differential affinities among DNA, AuNPs, and multifarious proteins. It results in distinct aggregation states of encoders to cause diverse ultraviolet absorption, which may be statistically characterized to achieve highly facile and precise identification for lipoprotein subclasses. Remarkably, LDL at 0.05-37.5 μg/mL could be identified by the encoder system. 11 typical proteins including three lipoprotein subclasses in human serum were also precisely discriminated. Furthermore, the accurate identification of lipoprotein subclasses with different molar ratios from real clinical serum samples were obtained.
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Affiliation(s)
- Jianfang Cao
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, China
| | - Peiying Lv
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, China
| | - Yang Shu
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, China.
| | - Jianhua Wang
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, China.
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Chunta S, Suedee R, Boonsriwong W, Lieberzeit PA. Biomimetic sensors targeting oxidized-low-density lipoprotein with molecularly imprinted polymers. Anal Chim Acta 2020; 1116:27-35. [PMID: 32389186 DOI: 10.1016/j.aca.2020.04.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Oxidized-low-density lipoprotein (oxLDL) is well-recognized as an actual patho-atherogenic lipoprotein: elevated serum concentration of oxLDL increases the risk for developing atherosclerosis, leading to coronary artery disease (CAD). Herein, we report an approach for sensing oxLDL directly in serum with molecularly imprinted polymer (MIP) thin films on quartz crystal microbalance (QCM). The resulting MIP sensors show low cross-reaction toward low-density lipoprotein (LDL) and high-density lipoprotein (HDL): signals are around one magnitude smaller. Very-low-density lipoprotein (VLDL) and human serum albumin (HSA) do not lead to any significant sensor response. The sensor allowed for accurately assessing oxLDL over the detection range of 86-5600 μg dL-1, which covers the clinically relevant concentrations. The sensor determines oxLDL with recovery accuracy of 92-107% and a precision of 1-8% coefficient variation. Compared with commercially available oxLDL ELISA test kit our sensor reveals similar characteristics obtaining a correlation coefficient of 0.98. However, the sensors have rapid response times of 10 min compared to 210 min of ELISA, which demonstrates their efficiency in assessing this sensitive atherogenic biomarker for CAD diagnostics.
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Affiliation(s)
- Suticha Chunta
- Department of Clinical Chemistry, Faculty of Medical Technology, Prince of Songkla University, Hatyai, Songkla, 90110, Thailand
| | - Roongnapa Suedee
- Department of Pharmaceutical Chemistry, Faculty of Pharmaceutical Sciences, Prince of Songkla University, Hatyai, Songkla, 90110, Thailand
| | | | - Peter A Lieberzeit
- Department of Physical Chemistry, Faculty for Chemistry, University of Vienna, Währinger Straße 42, A-1090, Vienna, Austria.
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Chunta S, Suedee R, Lieberzeit PA. Low-Density Lipoprotein Sensor Based on Molecularly Imprinted Polymer. Anal Chem 2015; 88:1419-25. [PMID: 26643785 DOI: 10.1021/acs.analchem.5b04091] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Increased level of low-density lipoprotein (LDL) strongly correlates with incidence of coronary heart disease. We synthesized novel molecularly imprinted polymers (MIP) as biomimetic specific receptors to establish rapid analysis of LDL levels. For that purpose the ratios of monomers acrylic acid (AA), methacrylic acid (MAA), and N-vinylpyrrolidone (VP), respectively, were screened on 10 MHz dual-electrode quartz crystal microbalances (QCM). Mixing MAA and VP in the ratio 3:2 (m/m) revealed linear sensor characteristic to LDL cholesterol (LDL-C) from 4 to 400 mg/dL or 0.10-10.34 mmol/L in 100 mM phosphate-buffered saline (PBS) without significant interference: high-density lipoprotein (HDL) yields 4-6% of the LDL signal, very-low-density-lipoprotein (VLDL) yields 1-3%, and human serum albumin (HSA) yields 0-2%. The LDL-MIP sensor reveals analytical accuracy of 95-96% at the 95% confidence interval with precision at 6-15%, respectively. Human serum diluted 1:2 with PBS buffer was analyzed by LDL-MIP sensors to demonstrate applicability to real-life samples. The sensor responses are excellently correlated to the results of the standard technique, namely, a homogeneous enzymatic assay (R(2) = 0.97). This demonstrates that the system can be successfully applied to human serum samples for determining LDL concentrations.
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Affiliation(s)
- Suticha Chunta
- University of Vienna , Faculty for Chemistry, Department of Analytical Chemistry, Waehringer Strasse 38, A-1090 Vienna, Austria
| | | | - Peter A Lieberzeit
- University of Vienna , Faculty for Chemistry, Department of Analytical Chemistry, Waehringer Strasse 38, A-1090 Vienna, Austria
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Chunta S, Suk-Anake J, Chansiri K, Promptmas C. A piezoelectric-based immunosensor for high density lipoprotein particle measurement. Analyst 2014; 139:4586-92. [DOI: 10.1039/c4an00601a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Asselin C, Ducharme A, Ntimbane T, Ruiz M, Fortier A, Guertin MC, Lavoie J, Diaz A, Levy É, Tardif JC, Des Rosiers C. Circulating levels of linoleic acid and HDL-cholesterol are major determinants of 4-hydroxynonenal protein adducts in patients with heart failure. Redox Biol 2013; 2:148-55. [PMID: 24494189 PMCID: PMC3909262 DOI: 10.1016/j.redox.2013.12.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2013] [Accepted: 12/10/2013] [Indexed: 02/07/2023] Open
Abstract
OBJECTIVE Measurements of oxidative stress biomarkers in patients with heart failure (HF) have yielded controversial results. This study aimed at testing the hypothesis that circulating levels of the lipid peroxidation product 4-hydroxynonenal bound to thiol proteins (4HNE-P) are strongly associated with those of its potential precursors, namely n-6 polyunsaturated fatty acids (PUFA). METHODS AND RESULTS Circulating levels of 4HNE-P were evaluated by gas chromatography-mass spectrometry in 71 control subjects and 61 ambulatory symptomatic HF patients along with various other clinically- and biochemically-relevant parameters, including other oxidative stress markers, and total levels of fatty acids from all classes, which reflect both free and bound to cholesterol, phospholipids and triglycerides. All HF patients had severe systolic functional impairment despite receiving optimal evidence-based therapies. Compared to controls, HF patients displayed markedly lower circulating levels of HDL- and LDL-cholesterol, which are major PUFA carriers, as well as of PUFA of the n-6 series, specifically linoleic acid (LA; P=0.001). Circulating 4HNE-P in HF patients was similar to controls, albeit multiple regression analysis revealed that LA was the only factor that was significantly associated with circulating 4HNE-P in the entire population (R (2)=0.086; P=0.02). In HF patients only, 4HNE-P was even more strongly associated with LA (P=0.003) and HDL-cholesterol (p<0.0002). Our results demonstrate that 4HNE-P levels, expressed relative to HDL-cholesterol, increase as HDL-cholesterol plasma levels decrease in the HF group only. CONCLUSION Results from this study emphasize the importance of considering changes in lipids and lipoproteins in the interpretation of measurements of lipid peroxidation products. Further studies appear warranted to explore the possibility that HDL-cholesterol particles may be a carrier of 4HNE adducts.
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Key Words
- 4-Hydroxynnonenal
- 4HNE, 4-hydroxynonenal
- 4HNE-P, 4-hydroxynonenal bound to circulating thiol proteins
- AA, arachidonic acid
- CRP, C-reactive protein
- DHA, docosahexanaenoic acid
- EPA, eicosapentaenoic acid
- GSH, reduced glutathione
- GSSG, oxidized glutathione
- HF, heart failure
- HFC-MHI, heart failure clinic of the Montreal Heart Institute
- HOMA-IR, homeostatic model assessment of insulin resistance
- Heart failure patients
- LA, linoleic acid
- Linoleic acid
- Lipid peroxidation
- MDA, malondialdehyde
- MPO, myeloperoxidase
- NT-pro-BNP, N-terminal proB-type natriuretic peptide
- NYHA, New York Heart Association
- Oxidative stress
- PUFA, polyunsaturated fatty acids
- Polyunsaturated fatty acids
- RAS, renin-angiotensin system
- TBARS, thiobarbituric acid-reactive substances
- TNF, tumor necrosis factor
- eGFR, estimated glomerular filtration rate
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Affiliation(s)
- Caroline Asselin
- Montreal Heart Institute, Research Center, 5000 Belanger Street, Montreal, Quebec, Canada H1T 1C8
| | - Anique Ducharme
- Department of Medicine, Université de Montréal, Montreal, Quebec, Canada
- Montreal Heart Institute, Research Center, 5000 Belanger Street, Montreal, Quebec, Canada H1T 1C8
| | - Thierry Ntimbane
- Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
- Montreal Heart Institute, Research Center, 5000 Belanger Street, Montreal, Quebec, Canada H1T 1C8
| | - Matthieu Ruiz
- Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
- Montreal Heart Institute, Research Center, 5000 Belanger Street, Montreal, Quebec, Canada H1T 1C8
| | - Annik Fortier
- Montreal Heart Institute Coordinating Center, Montreal, Quebec, Canada
| | | | - Joël Lavoie
- Montreal Heart Institute, Research Center, 5000 Belanger Street, Montreal, Quebec, Canada H1T 1C8
| | - Ariel Diaz
- Department of Medicine, Université de Montréal, Montreal, Quebec, Canada
- Montreal Heart Institute, Research Center, 5000 Belanger Street, Montreal, Quebec, Canada H1T 1C8
| | - Émile Levy
- Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
- CHU Sainte-Justine, Montreal, Quebec, Canada
| | - Jean-Claude Tardif
- Department of Medicine, Université de Montréal, Montreal, Quebec, Canada
- Montreal Heart Institute, Research Center, 5000 Belanger Street, Montreal, Quebec, Canada H1T 1C8
| | - Christine Des Rosiers
- Department of Nutrition, Université de Montréal, Montreal, Quebec, Canada
- Montreal Heart Institute, Research Center, 5000 Belanger Street, Montreal, Quebec, Canada H1T 1C8
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Oxidized high-density lipoprotein is associated with increased plasma glucose in non-diabetic dyslipidemic subjects. Clin Chim Acta 2012; 414:125-129. [PMID: 22981508 DOI: 10.1016/j.cca.2012.08.021] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2012] [Revised: 08/23/2012] [Accepted: 08/23/2012] [Indexed: 12/30/2022]
Abstract
BACKGROUND Oxidized high-density lipoprotein (oxHDL) has reduced capacity for cholesterol efflux and some of other anti-atherogenic properties of HDL, but the role of oxHDL in the pathogenesis of cardiometabolic disease has not been fully demonstrated. This study investigated the association of oxHDL with plasma glucose (PG) and the other atherosclerotic risk variables in non-diabetic dyslipidemic subjects. METHODS Conventional atherosclerotic markers and LDL particle size (LDL-PS), as determined by gel electrophoresis, were measured in 155 non-diabetic subjects (mean age of 57 years) with dyslipidemia. Serum oxHDL levels were quantified using an antibody against oxidized human apoA-I in a sandwich ELISA format. RESULTS Multiple regression analysis adjusted for possible confounders revealed that HDL-cholesterol was independently, significantly and positively correlated with LDL-PS and oxHDL. By multiple regression analysis, oxHDL was independently, significantly and positively correlated with fasting PG (β=0.19, P=0.01). Subjects in the highest PG tertile group had approximately 30% higher oxHDL levels than the lowest PG tertile group. CONCLUSIONS These results suggest that high PG levels may contribute to the HDL oxidation, irrespective of HDL-cholesterol levels, even in non-diabetic subjects with dyslipidemia, and that the measurement of oxHDL may be a useful marker of dysfunctional HDL.
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Abstract
PURPOSE OF REVIEW To address the progress of the investigation on dysfunctional high-density lipoprotein (HDL). RECENT FINDINGS HDL is generally considered to be an independent protective factor against cardiovascular disease. However, emerging evidence indicates that HDL can be modified under certain circumstances and lose its protective effect or even become atherogenic. The underlying mechanisms responsible for generating the dysfunctional HDL and the chemical and structural changes of HDL remain largely unknown. Recent studies focus on the role of myeloperoxidase in generating oxidants as participants in rendering HDL dysfunctional in vivo. Myeloperoxidase modifies HDL in humans by oxidation of specific amino acid residues in apolipoprotein A-I, which impairs cholesterol efflux through ATP-binding cassette transporter A1 and contributes to atherogenesis. SUMMARY HDL may not always be atheroprotective and can be atherogenic paradoxically under certain conditions. The mechanisms responsible for generating the dysfunctional HDL remain largely unknown. Recent data suggest that myeloperoxidase-associated modification of HDL may be one of the mechanisms. Further studies are needed to investigate the in-vivo mechanisms of HDL modification and identify therapeutic approaches aiming at controlling HDL modification.
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Affiliation(s)
- Hong Feng
- Kentucky Pediatric Research Institute, Department of Pediatrics, University of Kentucky Medical Center, Lexington, Kentucky 40536, USA
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Norata GD, Pirillo A, Catapano AL. Modified HDL: biological and physiopathological consequences. Nutr Metab Cardiovasc Dis 2006; 16:371-386. [PMID: 16829346 DOI: 10.1016/j.numecd.2006.01.012] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2005] [Accepted: 01/03/2006] [Indexed: 01/26/2023]
Abstract
Epidemiological and clinical studies have demonstrated the inverse association between HDL cholesterol levels (HDL-C) and the risk of coronary heart disease (CHD). This correlation is believed to relate to the ability of HDL to promote reverse cholesterol transport. Remodeling of HDL due to chemical/physical modifications can dramatically affect its functions, leading to dysfunctional HDL that could promote atherogenesis. HDL modification can be achieved by different means: (i) non-enzymatic modifications, owing to the presence of free metal ions in the atherosclerotic plaques; (ii) cell-associated enzymes, which can degrade the apoproteins without significant changes in the lipid moiety, or can alternatively induce apoprotein cross-linking and lipid oxidation; (iii) association with acute phase proteins, whose circulating levels are significantly increased during inflammation which may modify HDL structure and functions; and (iv) metabolic modifications, such as glycation that occurs under hyperglycaemic conditions. Available data suggest that HDL can easily be modified losing their anti-atherogenic activities. These observation results mainly from in vitro studies, while few in vivo data, are available. Furthermore the in vivo mechanisms involved in HDL modification are ill understood. A better knowledge of these pathways may provide possible therapeutic target aimed at reducing HDL modification.
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Ghisellini P, Paternolli C, Nicolini C. Site-directed mutations (Asp405Ile and Glu124Ile) in cytochrome P450scc: effect on adrenodoxin binding. J Cell Biochem 2005; 95:720-30. [PMID: 15832374 DOI: 10.1002/jcb.20442] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Cytochrome P450scc, mitochondrial adrenodoxin (Adx), and adrenodoxin reductase (AdR) are an essential components in a steroid hydroxylation system. In particular, mytochondrial cytochrome P450scc enzyme catalyses the first step in steroid hormones biosynthesis, represented by the conversion of cholesterol to pregnenolone. In order to study the effect of single mutations on the Adx binding a model of bovine cytochrome P450scc, previously optimized by molecular modeling, was utilized. It was hypothesized by molecular docking that two residues (Asp405 and Glu124) are involved in Adx binding. By site-directed mutagenesis, two mutants of cytochrome P450scc (Asp405Ile and Glu124Ile) expressed in Escherichia coli, were realized by replacing with isoleucines. The site-directed mutations effect on Adx binding was evaluated by differential spectral titration. The apparent dissociation constant values for Asp405Ile and Glu124Ile cytochrome P450scc show that the mutated residues seem to be at the interaction domain with Adx or at least close to it, as predicted by molecular modeling study. Finally, the engineered enzymes were characterized by biochemical and biophysical techniques such as circular dichroism (CD), UV/Vis spectroscopy, and electrochemical analysis.
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Affiliation(s)
- Paola Ghisellini
- Nanoworld Institute and Biophysics Division, University of Genoa, Corso Europa, 30, Genoa, Italy
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Watson D, Atsriku C, Oliveira E. Review role of liquid chromatography–mass spectrometry in the analysis of oxidation products and antioxidants in biological systems. Anal Chim Acta 2003. [DOI: 10.1016/s0003-2670(03)00467-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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