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Miyakoshi T, Mutsuda Y, Horiuchi Y, Kameda T, Tozuka M, Ohkawa R. Improvement in bilirubin influence on cholesterol efflux capacity evaluation using the immobilized liposome-bound gel beads method. Biosci Rep 2023; 43:BSR20230393. [PMID: 37259987 PMCID: PMC10807951 DOI: 10.1042/bsr20230393] [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: 03/03/2023] [Revised: 05/02/2023] [Accepted: 05/31/2023] [Indexed: 06/02/2023] Open
Abstract
INTRODUCTION High-density lipoprotein (HDL) has a cholesterol efflux capacity (CEC) that protects against atherosclerosis. Recently, we developed an assay for CEC evaluation, named the immobilized liposome-bound gel beads (ILG) method, which is a highly accurate, simple, and safe method for CEC evaluation because it uses liposomes and BODIPY-labeled cholesterol instead of cultured cells and radioactive substances, respectively. Although the ILG method can be implemented in clinical settings, our previous study revealed that bilirubin causes a positive error in the CEC value. Therefore, in the present study, we attempted to improve the influence of bilirubin levels on the ILG method. METHODS To investigate why bilirubin caused a positive error in CEC values when using the ILG method, 3D fluorescence spectra of BODIPY-labeled cholesterol and bilirubin were measured. To avoid the fluorescence emitted by bilirubin, CEC was measured using the ILG method with shifting of excitation wavelength for BODIPY-labeled cholesterol quantification. In addition, we used bilirubin oxidase to oxidize bilirubin during the incubation time of the ILG method to weaken bilirubin fluorescence. RESULTS We found that bilirubin emitted fluorescence at the measurement setting of the ILG method. By shifting the excitation wavelength, the positive error caused by bilirubin was improved by approximately 70%. Furthermore, by utilizing bilirubin oxidase, the false-high values of CEC were improved by approximately 80%. CONCLUSIONS Bilirubin interferes with CEC assay using BODIPY-cholesterol, but we successfully improved the influence of bilirubin on CEC evaluation using the ILG method. These improvements will promote the clinical application of the ILG method.
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Affiliation(s)
- Tsunehiro Miyakoshi
- Department of Analytical Laboratory Chemistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Yume Mutsuda
- Department of Analytical Laboratory Chemistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Yuna Horiuchi
- Department of Analytical Laboratory Chemistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
- Department of Clinical Laboratory Technology, Faculty of Medical Sciences, Juntendo University, 6-8-1, Hinode, Urayasu, Chiba 279-0013, Japan
| | - Takahiro Kameda
- Department of Analytical Laboratory Chemistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
| | - Minoru Tozuka
- Life Science Research Center, Nagano Children’s Hospital, Nagano, Japan
| | - Ryunosuke Ohkawa
- Department of Analytical Laboratory Chemistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan
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Development and validation of novel automatable assay for cholesterol efflux capacity. Biosci Rep 2023; 43:232455. [PMID: 36645426 PMCID: PMC9905788 DOI: 10.1042/bsr20221519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Revised: 12/24/2022] [Accepted: 01/16/2023] [Indexed: 01/17/2023] Open
Abstract
During the past decade, evaluation of high-density lipoprotein (HDL) functionality has been well studied for predicting cardiovascular disease (CVD) risk. Cholesterol efflux capacity (CEC) is the strongest candidate as the biomarker out of various HDL antiatherosclerotic functions. However, CEC has not yet been introduced clinically because of several technical issues, including the use of radioactive materials and differentiated cells in the assay. Previously, our laboratory developed a radioisotope- and cell-free CEC assay called the immobilized liposome-bound gel beads (ILGs) method to replace the conventional method. However, the separation process of the supernatant was not suitable for installation in an automatic analyzer. The present study aims to develop a new method that is easier to operate. We assumed that the use of magnetic beads instead of gel beads would enable the skip of the centrifugal process. First, similar to the ILG method, porous magnetic beads were treated with liposomes containing fluorescently labeled cholesterol. Fluorescence was observed inside the magnetic beads, and almost the same amount of liposomes as in the ILG method was immobilized successfully. These immobilized liposome-bound magnetic beads (ILMs) were available for CEC assay when HDL and apolipoprotein B-100-depleted serum (BDS) were used as cholesterol acceptors. The ILM method showed sufficient basic performance and a good correlation with the ILG method. Furthermore, when the CEC of 15 serum samples from healthy subjects was measured, a good correlation between HDL-cholesterol level and the ILG method was confirmed. Thus, it was confirmed that the ILM method was successfully developed and could be automated.
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Ko YA, Billheimer JT, Lyssenko NN, Kueider-Paisley A, Wolk DA, Arnold SE, Leung YY, Shaw LM, Trojanowski JQ, Kaddurah-Daouk RF, Kling MA, Rader DJ. ApoJ/Clusterin concentrations are determinants of cerebrospinal fluid cholesterol efflux capacity and reduced levels are associated with Alzheimer's disease. Alzheimers Res Ther 2022; 14:194. [PMID: 36572909 PMCID: PMC9791777 DOI: 10.1186/s13195-022-01119-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 11/06/2022] [Indexed: 12/27/2022]
Abstract
BACKGROUND Alzheimer's disease (AD) shares risk factors with cardiovascular disease (CVD) and dysregulated cholesterol metabolism is a mechanism common to both diseases. Cholesterol efflux capacity (CEC) is an ex vivo metric of plasma high-density lipoprotein (HDL) function and inversely predicts incident CVD independently of other risk factors. Cholesterol pools in the central nervous system (CNS) are largely separate from those in blood, and CNS cholesterol excess may promote neurodegeneration. CEC of cerebrospinal fluid (CSF) may be a useful measure of CNS cholesterol trafficking. We hypothesized that subjects with AD and mild cognitive impairment (MCI) would have reduced CSF CEC compared with Cognitively Normal (CN) and that CSF apolipoproteins apoA-I, apoJ, and apoE might have associations with CSF CEC. METHODS We retrieved CSF and same-day ethylenediaminetetraacetic acid (EDTA) plasma from 108 subjects (40 AD; 18 MCI; and 50 CN) from the Center for Neurodegenerative Disease Research biobank at the Perelman School of Medicine, University of Pennsylvania. For CSF CEC assays, we used N9 mouse microglial cells and SH-SY5Y human neuroblastoma cells, and the corresponding plasma assay used J774 cells. Cells were labeled with [3H]-cholesterol for 24 h, had ABCA1 expression upregulated for 6 h, were exposed to 33 μl of CSF, and then were incubated for 2.5 h. CEC was quantified as percent [3H]-cholesterol counts in medium of total counts medium+cells, normalized to a pool sample. ApoA-I, ApoJ, ApoE, and cholesterol were also measured in CSF. RESULTS We found that CSF CEC was significantly lower in MCI compared with controls and was poorly correlated with plasma CEC. CSF levels of ApoJ/Clusterin were also significantly lower in MCI and were significantly associated with CSF CEC. While CSF ApoA-I was also associated with CSF CEC, CSF ApoE had no association with CSF CEC. CSF CEC is significantly and positively associated with CSF Aβ. Taken together, ApoJ/Clusterin may be an important determinant of CSF CEC, which in turn could mitigate risk of MCI and AD risk by promoting cellular efflux of cholesterol or other lipids. In contrast, CSF ApoE does not appear to play a role in determining CSF CEC.
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Affiliation(s)
- Yi-An Ko
- grid.25879.310000 0004 1936 8972Division of Translational Medicine and Human Research, Perelman School of Medicine, University of Pennsylvania, 11-125 Smilow Center for Translational Research, 3400 Civic Center Blvd, Philadelphia, PA 19104-5158 USA
| | - Jeffrey T. Billheimer
- grid.25879.310000 0004 1936 8972Division of Translational Medicine and Human Research, Perelman School of Medicine, University of Pennsylvania, 11-125 Smilow Center for Translational Research, 3400 Civic Center Blvd, Philadelphia, PA 19104-5158 USA
| | - Nicholas N. Lyssenko
- grid.264727.20000 0001 2248 3398Alzheimer’s Center at Temple, Department of Neural Sciences, Lewis Katz School of Medicine at Temple University, Philadelphia, PA 19140 USA
| | - Alexandra Kueider-Paisley
- grid.26009.3d0000 0004 1936 7961Department of Psychiatry and Behavioral Sciences, Duke University, Durham, NC 27708 USA
| | - David A. Wolk
- grid.25879.310000 0004 1936 8972Department of Neurology, University of Pennsylvania, Philadelphia, PA 19104 USA
| | - Steven E. Arnold
- grid.38142.3c000000041936754XDepartment of Neurology, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02115 USA
| | - Yuk Yee Leung
- grid.25879.310000 0004 1936 8972Penn Neurodegeneration Genomics Center, Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104 USA
| | - Leslie M. Shaw
- grid.25879.310000 0004 1936 8972Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA 19104 USA
| | - John Q. Trojanowski
- grid.25879.310000 0004 1936 8972Division of Translational Medicine and Human Research, Perelman School of Medicine, University of Pennsylvania, 11-125 Smilow Center for Translational Research, 3400 Civic Center Blvd, Philadelphia, PA 19104-5158 USA
| | - Rima F. Kaddurah-Daouk
- grid.26009.3d0000 0004 1936 7961Department of Psychiatry and Behavioral Sciences, Duke University, Durham, NC 27708 USA ,grid.26009.3d0000 0004 1936 7961Duke Institute for Brain Sciences, Duke University, Durham, NC 27708 USA ,grid.26009.3d0000 0004 1936 7961Department of Medicine, Duke University, Durham, NC 27708 USA
| | - Mitchel A. Kling
- grid.262671.60000 0000 8828 4546Department of Geriatrics and Gerontology, New Jersey Institute for Successful Aging, Rowan University School of Osteopathic Medicine, 42 E. Laurel Rd., Suite 1800, Stratford, NJ 08084 USA ,grid.25879.310000 0004 1936 8972Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania USA
| | - Daniel J. Rader
- grid.25879.310000 0004 1936 8972Division of Translational Medicine and Human Research, Perelman School of Medicine, University of Pennsylvania, 11-125 Smilow Center for Translational Research, 3400 Civic Center Blvd, Philadelphia, PA 19104-5158 USA
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Effects of Antirheumatic Treatment on Cell Cholesterol Efflux and Loading Capacity of Serum Lipoproteins in Spondylarthropathies. J Clin Med 2022; 11:jcm11247330. [PMID: 36555946 PMCID: PMC9780876 DOI: 10.3390/jcm11247330] [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: 12/05/2022] [Accepted: 12/07/2022] [Indexed: 12/14/2022] Open
Abstract
Spondyloarthropathies (SpA) are associated with increased cardiovascular risk. Among possible mechanisms is the dysfunction of serum lipoproteins in regulating cell cholesterol homeostasis. Cholesterol efflux capacity (CEC)-the atheroprotective ability of HDL (high density lipoproteins) to accept cholesterol from macrophages-might predict cardiovascular disease independently of HDL-cholesterol levels. We aimed at evaluating modifications of CEC and of the atherogenic cholesterol loading capacity (CLC) of serum lipoproteins in psoriatic arthritis (PsA) and ankylosing spondylitis (AS) following anti-rheumatic treatment. A total of 62 SpA patients (37 PsA and 25 AS) were evaluated before and after treatment with tumor necrosis factor inhibitor and/or methotrexate. CEC and CLC were measured by radioisotopic and fluorometric techniques, respectively. Endothelial function was assessed by finger plethysmography (Endopat). In the whole SpA group, total and HDL-cholesterol increased after treatment, while lipoprotein(a) decreased and CLC was unchanged. Treatment was associated with increased Scavenger Receptor class B type I (SR-BI)-mediated CEC in the AS group. SR-BI- and ABCG1-mediated CEC were negatively associated with inflammatory parameters and positively related to coffee consumption. SR-BI CEC and CLC were positively and negatively associated with endothelial function, respectively. Our pilot study suggests that anti-rheumatic treatment is associated with favorable modulation of lipoprotein quality and function in SpA, particularly in AS, in spite of the induced increase in total cholesterol levels. If confirmed in a larger population, this might represent an atheroprotective benefit beyond what is reflected by conventional serum lipid profile.
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Adorni MP, Palumbo M, Marchi C, Zimetti F, Ossoli A, Turri M, Bernini F, Hollan I, Moláček J, Treska V, Ronda N. HDL metabolism and functions impacting on cell cholesterol homeostasis are specifically altered in patients with abdominal aortic aneurysm. Front Immunol 2022; 13:935241. [PMID: 36172376 PMCID: PMC9510680 DOI: 10.3389/fimmu.2022.935241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 08/23/2022] [Indexed: 11/13/2022] Open
Abstract
BackgroundThe etiopathogenesis of abdominal aortic aneurysm (AAA) is still unclarified, but vascular inflammation and matrix metalloproteases activation have a recognized role in AAA development and progression. Circulating lipoproteins are involved in tissue inflammation and repair, particularly through the regulation of intracellular cholesterol, whose excess is associated to cell damage and proinflammatory activation. We analyzed lipoprotein metabolism and function in AAA and in control vasculopathic patients, to highlight possible non-atherosclerosis-related, specific abnormalities.MethodsWe measured fluorometrically serum esterified/total cholesterol ratio, as an index of lecithin-cholesterol acyltransferase (LCAT) activity, and cholesteryl ester transfer protein (CETP) activity in patients referred to vascular surgery either for AAA (n=30) or stenotic aortic/peripheral atherosclerosis (n=21) having similar burden of cardiovascular risk factors and disease. We measured high-density lipoprotein (HDL)-cholesterol efflux capacity (CEC), through the ATP-binding cassette G1 (ABCG1) and A1 (ABCA1) pathways and serum cell cholesterol loading capacity (CLC), by radioisotopic and fluorimetric methods, respectively.ResultsWe found higher LCAT (+23%; p < 0.0001) and CETP (+49%; p < 0.0001) activity in AAA sera. HDL ABCG1-CEC was lower (−16%; p < 0.001) and ABCA1-CEC was higher (+31.7%; p < 0.0001) in AAA. Stratification suggests that smoking may partly contribute to these modifications. CEC and CETP activity correlated with CLC only in AAA.ConclusionsWe demonstrated that compared to patients with stenotic atherosclerosis, patients with AAA had altered HDL metabolism and functions involved in their anti-inflammatory and tissue repair activity, particularly through the ABCG1-related intracellular signaling. Clarifying the relevance of this mechanism for AAA evolution might help in developing new diagnostic parameters and therapeutic targets for the early management of this condition.
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Affiliation(s)
- Maria Pia Adorni
- Department of Medicine and Surgery, Unit of Neuroscience, University of Parma, Via Volturno 39/F, Parma, Italy
| | - Marcella Palumbo
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, Parma, Italy
| | - Cinzia Marchi
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, Parma, Italy
| | - Francesca Zimetti
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, Parma, Italy
| | - Alice Ossoli
- Centro E. Grossi Paoletti, Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milano, Italy
| | - Marta Turri
- Centro E. Grossi Paoletti, Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milano, Italy
| | - Franco Bernini
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, Parma, Italy
- *Correspondence: Franco Bernini,
| | - Ivana Hollan
- Lillehammer Hospital for Rheumatic Diseases, M. Grundtvigs veg 6, Lillehammer, Norway and Brigham and Women’s Hospital, Cardiology Division, Boston, United States
| | - Jiří Moláček
- Department of Vascular Surgery, Faculty of Medicine and University Hospital in Plzen, Charles University Ovocný trh 5 Prague 1, Plzen, Czechia
| | - Vladislav Treska
- Department of Vascular Surgery, Faculty of Medicine and University Hospital in Plzen, Charles University Ovocný trh 5 Prague 1, Plzen, Czechia
| | - Nicoletta Ronda
- Department of Food and Drug, University of Parma, Parco Area delle Scienze 27/A, Parma, Italy
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HDL, cholesterol efflux, and ABCA1: Free from good and evil dualism. J Pharmacol Sci 2022; 150:81-89. [DOI: 10.1016/j.jphs.2022.07.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 07/15/2022] [Accepted: 07/25/2022] [Indexed: 11/19/2022] Open
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Adorni MP, Biolo M, Zimetti F, Palumbo M, Ronda N, Scarinzi P, Simioni P, Lupo MG, Ferri N, Previato L, Bernini F, Zambon A. HDL Cholesterol Efflux and Serum Cholesterol Loading Capacity Alterations Associate to Macrophage Cholesterol Accumulation in FH Patients with Achilles Tendon Xanthoma. Int J Mol Sci 2022; 23:ijms23158255. [PMID: 35897824 PMCID: PMC9332368 DOI: 10.3390/ijms23158255] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 07/22/2022] [Accepted: 07/24/2022] [Indexed: 02/05/2023] Open
Abstract
Achilles tendon xanthoma (ATX) formation involves macrophage cholesterol accumulation within the tendon, similar to that occurring in atheroma. Macrophage cholesterol homeostasis depends on serum lipoprotein functions, namely the high-density lipoprotein (HDL) capacity to promote cell cholesterol efflux (cholesterol efflux capacity, CEC) and the serum cholesterol loading capacity (CLC). We explored the HDL-CEC and serum CLC, comparing 16 FH patients with ATX to 29 FH patients without ATX. HDL-CEC through the main efflux mechanisms mediated by the transporters ATP binding cassette G1 (ABCG1) and A1 (ABCA1) and the aqueous diffusion (AD) process was determined by a cell-based radioisotopic technique and serum CLC fluorimetrically. Between the two groups, no significant differences were found in terms of plasma lipid profile. A trend toward reduction of cholesterol efflux via AD and a significant increase in ABCA1-mediated HDL-CEC (+18.6%) was observed in ATX compared to no ATX patients. In ATX-presenting patients, ABCG1-mediated HDL-CEC was lower (−11%) and serum CLC was higher (+14%) compared to patients without ATX. Considering all the patients together, ABCG1 HDL-CEC and serum CLC correlated with ATX thickness inversely (p = 0.013) and directly (p < 0.0001), respectively. In conclusion, lipoprotein dysfunctions seem to be involved in ATX physiopathology and progression in FH patients.
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Affiliation(s)
- Maria Pia Adorni
- Unit of Neuroscience, Department of Medicine and Surgery, University of Parma, 43125 Parma, Italy;
| | - Marta Biolo
- Department of Medicine, University of Padua, 35128 Padua, Italy; (M.B.); (P.S.); (P.S.); (M.G.L.); (N.F.); (L.P.)
| | - Francesca Zimetti
- Department of Food and Drug, University of Parma, 43124 Parma, Italy; (F.Z.); (M.P.); (N.R.)
| | - Marcella Palumbo
- Department of Food and Drug, University of Parma, 43124 Parma, Italy; (F.Z.); (M.P.); (N.R.)
| | - Nicoletta Ronda
- Department of Food and Drug, University of Parma, 43124 Parma, Italy; (F.Z.); (M.P.); (N.R.)
| | - Paolo Scarinzi
- Department of Medicine, University of Padua, 35128 Padua, Italy; (M.B.); (P.S.); (P.S.); (M.G.L.); (N.F.); (L.P.)
| | - Paolo Simioni
- Department of Medicine, University of Padua, 35128 Padua, Italy; (M.B.); (P.S.); (P.S.); (M.G.L.); (N.F.); (L.P.)
| | - Maria Giovanna Lupo
- Department of Medicine, University of Padua, 35128 Padua, Italy; (M.B.); (P.S.); (P.S.); (M.G.L.); (N.F.); (L.P.)
| | - Nicola Ferri
- Department of Medicine, University of Padua, 35128 Padua, Italy; (M.B.); (P.S.); (P.S.); (M.G.L.); (N.F.); (L.P.)
| | - Lorenzo Previato
- Department of Medicine, University of Padua, 35128 Padua, Italy; (M.B.); (P.S.); (P.S.); (M.G.L.); (N.F.); (L.P.)
| | - Franco Bernini
- Department of Food and Drug, University of Parma, 43124 Parma, Italy; (F.Z.); (M.P.); (N.R.)
- Correspondence: ; Tel.: +39-0521-905039
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Palumbo M, Giammanco A, Purrello F, Pavanello C, Mombelli G, Di Pino A, Piro S, Cefalù AB, Calabresi L, Averna M, Bernini F, Zimetti F, Adorni MP, Scicali R. Effects of PCSK9 inhibitors on HDL cholesterol efflux and serum cholesterol loading capacity in familial hypercholesterolemia subjects: a multi-lipid-center real-world evaluation. Front Mol Biosci 2022; 9:925587. [PMID: 35928226 PMCID: PMC9343790 DOI: 10.3389/fmolb.2022.925587] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Accepted: 06/27/2022] [Indexed: 01/03/2023] Open
Abstract
Proprotein convertase subtilisin/kexin type 9 (PCSK9), beyond regulating LDL cholesterol (LDL-c) plasma levels, exerts several pleiotropic effects by modulating lipid metabolism in extrahepatic cells such as macrophages. Macrophage cholesterol homeostasis depends on serum lipoprotein functions, including the HDL capacity to promote cell cholesterol efflux (CEC) and the serum capacity to promote cell cholesterol loading (CLC). The aim of this observational study was to investigate the effect of PCSK9 inhibitors (PCSK9-i) treatment on HDL-CEC and serum CLC in patients with familial hypercholesterolemia (FH). 31 genetically confirmed FH patients were recruited. Blood was collected and serum isolated at baseline and after 6 months of PCSK9-i treatment. HDL-CEC was evaluated through the main pathways with a radioisotopic cell-based assay. Serum CLC was assessed fluorimetrically in human THP-1 monocyte-derived macrophages. After treatment with PCSK9-i, total cholesterol and LDL-c significantly decreased (−41.6%, p < 0.0001 and −56.7%, p < 0.0001, respectively). Total HDL-CEC was not different between patients before and after treatment. Conversely, despite no changes in HDL-c levels between the groups, ABCG1 HDL-CEC significantly increased after treatment (+22.2%, p < 0.0001) as well as HDL-CEC by aqueous diffusion (+7.8%, p = 0.0008). Only a trend towards reduction of ABCA1 HDL-CEC was observed after treatment. PCSK9-i significantly decreased serum CLC (−6.6%, p = 0.0272). This effect was only partly related to the reduction of LDL-c levels. In conclusion, PCSK9-i treatment significantly increased HDL-CEC through ABCG1 and aqueous diffusion pathways and reduced the serum CLC in FH patients. The favorable effect of PCSK9-i on functional lipid profile could contribute to the cardiovascular benefit of these drugs in FH patients.
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Affiliation(s)
| | - Antonina Giammanco
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (ProMISE)—University of Palermo, Palermo, Italy
| | - Francesco Purrello
- Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Chiara Pavanello
- Centro E. Grossi Paoletti, Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milano, Italy
- Centro Dislipidemie, ASST Grande Ospedale Metropolitano Niguarda, Milano, Italy
| | - Giuliana Mombelli
- Centro Dislipidemie, ASST Grande Ospedale Metropolitano Niguarda, Milano, Italy
| | - Antonino Di Pino
- Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Salvatore Piro
- Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
| | - Angelo Baldassare Cefalù
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (ProMISE)—University of Palermo, Palermo, Italy
| | - Laura Calabresi
- Centro E. Grossi Paoletti, Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milano, Italy
| | - Maurizio Averna
- Department of Health Promotion, Mother and Child Care, Internal Medicine and Medical Specialties (ProMISE)—University of Palermo, Palermo, Italy
| | - Franco Bernini
- Department of Food and Drug, University of Parma, Parma, Italy
| | - Francesca Zimetti
- Department of Food and Drug, University of Parma, Parma, Italy
- *Correspondence: Francesca Zimetti,
| | - Maria Pia Adorni
- Department of Medicine and Surgery, Unit of Neuroscience, University of Parma, Parma, Italy
| | - Roberto Scicali
- Department of Clinical and Experimental Medicine, University of Catania, Catania, Italy
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Horiuchi Y, Lai SJ, Kameda T, Tozuka M, Ohkawa R. Novel cholesterol efflux assay using immobilized liposome-bound gel beads: Confirmation and improvement for application in clinical laboratory. Ann Clin Biochem 2021; 59:134-143. [PMID: 34719976 DOI: 10.1177/00045632211054406] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
OBJECTIVES Cholesterol efflux capacity (CEC), an atheroprotective function of high-density lipoprotein, is expected to be a potential biomarker for cardiovascular disease. However, CEC has not been widely introduced for application in clinical laboratories because of the complexity of the conventional CEC assay using cells and radioactive materials. Previously, we developed a novel CEC assay using immobilized liposome-bound gel beads (ILG), which solves these issues. We aimed to confirm the validation and further improve the ILG method for application in the clinical setting. METHODS Cholesterol efflux capacity values by the ILG method assayed for shorter incubation time (4 h) were compared to those assayed for 16 h (our previous ILG method). To investigate a reference material that can correct the variation between ILG manufacturing lots, bovine serum albumin, human gamma-globulins, and globulin complexes were evaluated. CEC values were also estimated in plasmas obtained with different anticoagulants, serum treated with freeze-thaw cycles, and serum mixed with several interference substances. RESULTS The CEC of 4- and 16-h incubation times were well correlated. Globulin complexes may be used as a reference material. Plasma can be used as the specimen. The serum and stored temperature of the specimen did not largely affect CEC. Hemoglobin and chyle did not have an effect on CEC, whereas high-bilirubin serum showed elevated CEC. The effect of bilirubin was nearly canceled by subtracting basal fluorescence intensity. CONCLUSIONS Present ILG method further fulfills some requirements for application in clinical laboratory. Using this reliable simple method, evaluation for clinical significance of CEC is expected.
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Affiliation(s)
- Yuna Horiuchi
- Analytical Laboratory Chemistry, 92190Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan.,Research Fellow of Japan Society for the Promotion of Science, Chiyoda-ku, Tokyo, Japan
| | - Shao-Jui Lai
- Analytical Laboratory Chemistry, 92190Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
| | - Takahiro Kameda
- Analytical Laboratory Chemistry, 92190Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
| | - Minoru Tozuka
- Analytical Laboratory Chemistry, 92190Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan.,Life Science Research Center, Nagano Children's Hospital, Toyoshina, Azumino, Japan
| | - Ryunosuke Ohkawa
- Analytical Laboratory Chemistry, 92190Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Bunkyo-ku, Tokyo, Japan
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Comparison of a novel cholesterol efflux assay using immobilized liposome-bound gel beads with the conventional method. Biosci Rep 2021; 40:225884. [PMID: 32706025 PMCID: PMC7403950 DOI: 10.1042/bsr20201495] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Revised: 07/05/2020] [Accepted: 07/23/2020] [Indexed: 02/06/2023] Open
Abstract
Cholesterol efflux capacity (CEC) is an atheroprotective function of high-density lipoprotein (HDL). CEC is currently measured using artificially prepared foam cells composed of cultured macrophage and 3H-cholesterol. However, this conventional method is not suitable for clinical laboratory use due to poor repeatability, complexity, and low safety. Recently, we reported a novel CEC assay, called the immobilized liposome-bound gel beads (ILG) method. The ILG method is an alternative to foam cells, comprising gel beads and 4,4-diflioro-4-bora-3a,4a-s-indacene labeled cholesterol (BODIPY-cholesterol) instead of macrophage and 3H-cholesterol, respectively. The ILG method has shown adequate basic properties and strong correlation with the conventional method. Here, we aimed to compare this new ILG method with the conventional method in-depth. When apoB-depleted serum was used as the cholesterol acceptor (CA), the ILG method had far better reproducibility than the conventional method. The CEC of major HDL subclasses HDL2 and HDL3 had similar results in both the ILG and conventional method. However, the ILG method did not reflect the CEC of apolipoprotein (apo) A–I and a minor HDL subclass which uses ATP-binding cassette transporter A1 on foam cells. Superior reproducibility of the ILG method, which is a limitation of the conventional method, and similar CEC results for major HDL subclasses in the ILG and conventional methods, provide further evidence that the ILG method is promising for measuring CEC clinically. However, some HDL subclasses or apo might have poor CEC correlation between these methods. Further research is therefore needed to confirm the clinical significance of estimating CEC by the ILG method.
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van Velzen DM, Adorni MP, Zimetti F, Strazzella A, Simsek S, Sirtori CR, Heijer MD, Ruscica M. The effect of transgender hormonal treatment on high density lipoprotein cholesterol efflux capacity. Atherosclerosis 2021; 323:44-53. [PMID: 33836456 DOI: 10.1016/j.atherosclerosis.2021.03.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 02/25/2021] [Accepted: 03/10/2021] [Indexed: 11/19/2022]
Abstract
BACKGROUND AND AIMS A decrease in high-density lipoprotein (HDL)-cholesterol concentrations during transgender hormone therapy has been shown. However, the ability of HDL to remove cholesterol from arterial wall macrophages, termed cholesterol efflux capacity (CEC), has proven to be a better predictor of cardiovascular disease (CVD) largely independently of HDL-concentrations. In addition, the serum capacity to load macrophages with cholesterol (cholesterol loading capacity, CLC) represents an index of pro-atherogenic potential. As transgender individuals are exposed to lifelong exogenous hormone therapy (HT), it becomes of interest to study whether HDL-CEC and serum CLC are affected by HT. HDL-CEC and serum CLC have been evaluated in 15 trans men treated with testosterone and in 15 trans women treated with estradiol and cyproterone acetate at baseline and after 12 months of HT. METHODS Total HDL-CEC from macrophages and its major contributors, the ATP-binding cassette transporters (ABC) A1 and ABCG1 HDL-CEC and HDL-CEC by aqueous diffusion were determined by a radioisotopic assay. CLC was evaluated in human THP-1 macrophages. RESULTS In trans women, total HDL-CEC decreased by 10.8% (95%CI: -14.3;-7.3; p < 0.001), ABCA1 HDL-CEC by 23.8% (-34.7; -12.9; p < 0.001) and aqueous diffusion HDL-CEC by 4.8% (-8.4;-1.1; p < 0.01). In trans men, only aqueous diffusion HDL-CEC decreased significantly, -9.8% (-15.7;-3.9; p < 0.01). ABCG1 HDL-CEC did not change in either group. Serum CLC and HDL subclass distribution were not modified by HT in both groups. CONCLUSIONS Total HDL-CEC decreased during HT in trans women, with a specific reduction in ABCA1 CEC. This finding might contribute to a higher CVD risk.
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Affiliation(s)
- Daan M van Velzen
- Department of Internal Medicine, Division of Endocrinology, Amsterdam University Medical Center, Amsterdam, the Netherlands.
| | - Maria Pia Adorni
- Dipartimento di Medicina e Chirurgia, Unità di Neuroscienze, Università di Parma, Parma, Italy
| | | | - Arianna Strazzella
- Center E. Grossi Paoletti, Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, Milano, Italy
| | - Suat Simsek
- Department of Internal Medicine, Division of Endocrinology, Amsterdam University Medical Center, Amsterdam, the Netherlands; Department of Endocrinology, Northwest Clinics, Alkmaar, the Netherlands
| | - Cesare R Sirtori
- Department of Pharmacology and Biomolecular Sciences, Università degli Studi di Milano, Milano, Italy
| | - Martin den Heijer
- Department of Internal Medicine, Division of Endocrinology, Amsterdam University Medical Center, Amsterdam, the Netherlands
| | - Massimiliano Ruscica
- Department of Pharmacology and Biomolecular Sciences, Università degli Studi di Milano, Milano, Italy
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Cholesterol efflux capacity assay using immobilized liposomes and apolipoprotein B-depleted serum. Biosci Rep 2019; 39:BSR20190619. [PMID: 31152112 PMCID: PMC6579979 DOI: 10.1042/bsr20190619] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 05/28/2019] [Accepted: 05/30/2019] [Indexed: 12/13/2022] Open
Abstract
Cholesterol efflux capacity (CEC), an important functional step in reverse cholesterol transport, is the main anti-atherosclerotic function of high-density lipoprotein (HDL). Assays that improve the determination of CEC ex vivo for clinical applications are constantly explored. In the accompanying article, Horiuchi et al. (Biosci. Rep. (2019) 39(4), BSR20190213) evaluate the availability of apolipoprotein B-depleted serum for CEC assays. Using their recently developed immobilized liposome-bound gel beads (ILG) method, Horiuchi et al. demonstrate that apolipoprotein B-depleted serum obtained with poly ethylene glycol precipitation enables CEC assays to be easily and accurately introduced into laboratory medicine.
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