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Yan S, Li L, Horner D, Ebrahimi P, Chawes B, Dragsted LO, Rasmussen MA, Smilde AK, Acar E. Characterizing human postprandial metabolic response using multiway data analysis. Metabolomics 2024; 20:50. [PMID: 38722393 PMCID: PMC11082008 DOI: 10.1007/s11306-024-02109-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Accepted: 03/19/2024] [Indexed: 05/12/2024]
Abstract
INTRODUCTION Analysis of time-resolved postprandial metabolomics data can improve our understanding of the human metabolism by revealing similarities and differences in postprandial responses of individuals. Traditional data analysis methods often rely on data summaries or univariate approaches focusing on one metabolite at a time. OBJECTIVES Our goal is to provide a comprehensive picture in terms of the changes in the human metabolism in response to a meal challenge test, by revealing static and dynamic markers of phenotypes, i.e., subject stratifications, related clusters of metabolites, and their temporal profiles. METHODS We analyze Nuclear Magnetic Resonance (NMR) spectroscopy measurements of plasma samples collected during a meal challenge test from 299 individuals from the COPSAC2000 cohort using a Nightingale NMR panel at the fasting and postprandial states (15, 30, 60, 90, 120, 150, 240 min). We investigate the postprandial dynamics of the metabolism as reflected in the dynamic behaviour of the measured metabolites. The data is arranged as a three-way array: subjects by metabolites by time. We analyze the fasting state data to reveal static patterns of subject group differences using principal component analysis (PCA), and fasting state-corrected postprandial data using the CANDECOMP/PARAFAC (CP) tensor factorization to reveal dynamic markers of group differences. RESULTS Our analysis reveals dynamic markers consisting of certain metabolite groups and their temporal profiles showing differences among males according to their body mass index (BMI) in response to the meal challenge. We also show that certain lipoproteins relate to the group difference differently in the fasting vs. dynamic state. Furthermore, while similar dynamic patterns are observed in males and females, the BMI-related group difference is observed only in males in the dynamic state. CONCLUSION The CP model is an effective approach to analyze time-resolved postprandial metabolomics data, and provides a compact but a comprehensive summary of the postprandial data revealing replicable and interpretable dynamic markers crucial to advance our understanding of changes in the metabolism in response to a meal challenge.
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Affiliation(s)
- Shi Yan
- Department of Data Science and Knowledge Discovery, Simula Metropolitan Center for Digital Engineering, Oslo, Norway
| | - Lu Li
- Department of Data Science and Knowledge Discovery, Simula Metropolitan Center for Digital Engineering, Oslo, Norway
| | - David Horner
- COPSAC, Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Parvaneh Ebrahimi
- COPSAC, Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark
- Department of Food Science, University of Copenhagen, Copenhagen, Denmark
| | - Bo Chawes
- COPSAC, Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark
| | - Lars O Dragsted
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - Morten A Rasmussen
- COPSAC, Copenhagen Prospective Studies on Asthma in Childhood, Herlev and Gentofte Hospital, University of Copenhagen, Copenhagen, Denmark
- Department of Food Science, University of Copenhagen, Copenhagen, Denmark
| | - Age K Smilde
- Department of Data Science and Knowledge Discovery, Simula Metropolitan Center for Digital Engineering, Oslo, Norway
- Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands
| | - Evrim Acar
- Department of Data Science and Knowledge Discovery, Simula Metropolitan Center for Digital Engineering, Oslo, Norway.
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Ou SJL, Yang D, Pranata HP, Tai ES, Liu MH. Postprandial glycemic and lipidemic effects of black rice anthocyanin extract fortification in foods of varying macronutrient compositions and matrices. NPJ Sci Food 2023; 7:59. [PMID: 37914734 PMCID: PMC10620212 DOI: 10.1038/s41538-023-00233-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Accepted: 10/17/2023] [Indexed: 11/03/2023] Open
Abstract
Anthocyanin (ACN) fortification of commonly consumed foods is significant as a dietary strategy against the development of metabolic complications by delivering ACNs at high doses. However, its bioactivity and translated metabolic effects in the presence of varying food matrices and macro-constituents is particularly unclear. This end-to-end study investigates the metabolic effects of black rice ACN extract (BRAE) fortification-from in-vitro enzyme inhibitory activities and digestibility, to downstream in vivo impacts on GI, postprandial glycemia and lipidemia. The in vivo effects were investigated in two separate crossover randomised controlled trials (RCT) of 24 healthy participants each-the first RCT determined the postprandial blood glucose, insulin, and ACN bioavailability to a starch-rich single food over 2 h, while the second RCT determined the postprandial blood glucose, insulin, lipid panel, and lipoprotein particles and subfractions to a starch- and fat-rich composite meal over 4 h. In-vitro findings confirmed the inhibitory activities of major black rice ACNs on carbohydrases (p = 0.0004), lipases (p = 0.0002), and starch digestibility (p < 0.0001). in vivo, a 27-point mean GI reduction of wheat bread was observed with BRAE fortification, despite a non-significant attenuation in postprandial glycemia. Conversely, there were no differences in postprandial glycemia when fortified bread was consumed as a composite meal, but acute lipid profiles were altered: (1) improved plasma HDL-c, ([0.0140 mmol/L, 95% CI: (0.00639, 0.0216)], p = 0.0028), Apo-A1 ([0.0296 mmol/L, 95% CI: (0.00757, 0.0515)], p = 0.0203), and Apo-B ([0.00880 mmol/L, 95% CI: (0.00243, 0.0152)], p = 0.0185), (2) modified LDL and HDL subfractions (p < 0.05), and (3) remodelled lipid distributions in HDL and LDL particles. This end-to-end study indicates the potential of ACN fortification in GI reduction and modulating postprandial lipoprotein profiles to starch- and fat-rich composite meals.
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Affiliation(s)
- Sean Jun Leong Ou
- Division of Endocrinology, Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, Singapore, 117599, Singapore
- Department of Food Science and Technology, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Dimeng Yang
- Division of Endocrinology, Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore, 14 Medical Drive, Singapore, 117599, Singapore
- Department of Food Science and Technology, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - Hanny Putri Pranata
- Department of Food Science and Technology, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
| | - E Shyong Tai
- Division of Endocrinology, University Medicine Cluster, National University Hospital, 5 Lower Kent Ridge Road, Singapore, 119074, Singapore
| | - Mei Hui Liu
- Department of Food Science and Technology, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore.
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Bermingham KM, Mazidi M, Franks PW, Maher T, Valdes AM, Linenberg I, Wolf J, Hadjigeorgiou G, Spector TD, Menni C, Ordovas JM, Berry SE, Hall WL. Characterisation of Fasting and Postprandial NMR Metabolites: Insights from the ZOE PREDICT 1 Study. Nutrients 2023; 15:nu15112638. [PMID: 37299601 DOI: 10.3390/nu15112638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2023] [Revised: 05/12/2023] [Accepted: 05/18/2023] [Indexed: 06/12/2023] Open
Abstract
BACKGROUND Postprandial metabolomic profiles and their inter-individual variability are not well characterised. Here, we describe postprandial metabolite changes, their correlations with fasting values and their inter- and intra-individual variability, following a standardised meal in the ZOE PREDICT 1 cohort. METHODS In the ZOE PREDICT 1 study (n = 1002 (NCT03479866)), 250 metabolites, mainly lipids, were measured by a Nightingale NMR panel in fasting and postprandial (4 and 6 h after a 3.7 MJ mixed nutrient meal, with a second 2.2 MJ mixed nutrient meal at 4 h) serum samples. For each metabolite, inter- and intra-individual variability over time was evaluated using linear mixed modelling and intraclass correlation coefficients (ICC) were calculated. RESULTS Postprandially, 85% (of 250 metabolites) significantly changed from fasting at 6 h (47% increased, 53% decreased; Kruskal-Wallis), with 37 measures increasing by >25% and 14 increasing by >50%. The largest changes were observed in very large lipoprotein particles and ketone bodies. Seventy-one percent of circulating metabolites were strongly correlated (Spearman's rho >0.80) between fasting and postprandial timepoints, and 5% were weakly correlated (rho <0.50). The median ICC of the 250 metabolites was 0.91 (range 0.08-0.99). The lowest ICCs (ICC <0.40, 4% of measures) were found for glucose, pyruvate, ketone bodies (β-hydroxybutyrate, acetoacetate, acetate) and lactate. CONCLUSIONS In this large-scale postprandial metabolomic study, circulating metabolites were highly variable between individuals following sequential mixed meals. Findings suggest that a meal challenge may yield postprandial responses divergent from fasting measures, specifically for glycolysis, essential amino acid, ketone body and lipoprotein size metabolites.
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Affiliation(s)
- Kate M Bermingham
- Department of Nutritional Sciences, King's College London, London WC2R 2LS, UK
- Department of Twins Research and Genetic Epidemiology, King's College London, London WC2R 2LS, UK
| | - Mohsen Mazidi
- Department of Twins Research and Genetic Epidemiology, King's College London, London WC2R 2LS, UK
- Medical Research Council Population Health Research Unit, University of Oxford, Oxford OX1 3QR, UK
- Clinical Trial Service Unit and Epidemiological Studies Unit (CTSU), Nuffield Department of Population Health, University of Oxford, Oxford OX3 7LF, UK
| | - Paul W Franks
- Department of Clinical Sciences, Lund University, 21428 Malmö, Sweden
- Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, MA 02215, USA
| | - Tyler Maher
- Department of Nutritional Sciences, King's College London, London WC2R 2LS, UK
| | - Ana M Valdes
- School of Medicine, University of Nottingham, Nottingham NG5 1PB, UK
- Nottingham NIHR Biomedical Research Centre, Nottingham NG7 2UH, UK
| | - Inbar Linenberg
- Department of Nutritional Sciences, King's College London, London WC2R 2LS, UK
- ZOE Ltd., London SE1 7RW, UK
| | | | | | - Tim D Spector
- Department of Twins Research and Genetic Epidemiology, King's College London, London WC2R 2LS, UK
| | - Cristina Menni
- Department of Twins Research and Genetic Epidemiology, King's College London, London WC2R 2LS, UK
| | - Jose M Ordovas
- Jean Mayer USDA Human Nutrition Research Centre on Aging (JM-USDA-HNRCA), Tufts University, Boston, MA 02111, USA
- IMDEA Food Institute, CEI UAM + CSIC, 28049 Madrid, Spain
- Centro de Investigación Biomédica en Red-Fisiopatología de la Obesidad y Nutrición (CIBEROBN), Instituto de Salud Carlos III, 28029 Madrid, Spain
| | - Sarah E Berry
- Department of Nutritional Sciences, King's College London, London WC2R 2LS, UK
| | - Wendy L Hall
- Department of Nutritional Sciences, King's College London, London WC2R 2LS, UK
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Stănciulescu LA, Scafa A, Duduianu C, Stan R, Nicolescu A, Deleanu C, Dorobanțu M. Lipoprofiling Assessed by NMR Spectroscopy in Patients with Acute Coronary Syndromes: Is There a Need for Fasting Prior to Sampling? Diagnostics (Basel) 2022; 12:diagnostics12071675. [PMID: 35885579 PMCID: PMC9319954 DOI: 10.3390/diagnostics12071675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2022] [Revised: 07/04/2022] [Accepted: 07/08/2022] [Indexed: 11/20/2022] Open
Abstract
Most patients presenting in an emergency unit with acute coronary syndromes (ACS) (which include non-ST-elevation myocardial infarction (NSTEMI), ST-elevation MI (STEMI), and unstable angina) usually meet at least two cardiovascular risk factors, such as dyslipidemia, arterial hypertension, diabetes mellitus type 2, obesity, history of or current smoking, etc. Most ACS patients suffer from a type of dyslipidemia, and in addition to this there are ACS patients rushed into the emergency units for which the feeding status is unknown. Thus, we set out to evaluate the effect of fasting on 16 blood metabolite concentrations and 114 lipoprotein parameters on one control group and a group of statin-treated ACS patients hospitalized in a cardiovascular emergency unit, using Nuclear Magnetic Resonance (NMR) spectroscopy. The results indicated trends (in terms of number of cases, but not necessarily in terms of the magnitude of the effect) for as many as four metabolites and 48 lipoproteins. The effect was defined as a trend for results showing over 70% of the cases from either one or both groups that experienced parameter changes in the same direction (i.e., either increased or decreased). In terms of magnitude, the effect is rather low, leading to the overall conclusion that in cardiovascular (CV) emergency units, the blood samples analyzed in any feeding status would provide close results and very valuable information regarding prognosis and for fast decisions on patient’s proper management.
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Affiliation(s)
- Laura-Adina Stănciulescu
- Department of Cardiology, Emergency Clinical Hospital, 014461 Bucharest, Romania; (L.-A.S.); (A.S.)
| | - Alexandru Scafa
- Department of Cardiology, Emergency Clinical Hospital, 014461 Bucharest, Romania; (L.-A.S.); (A.S.)
- Faculty of Medicine, “Carol Davila” University of Medicine and Pharmacy, 050513 Bucharest, Romania;
| | - Cătălin Duduianu
- “C.D. Nenitescu” Centre of Organic Chemistry, Romanian Academy, 060023 Bucharest, Romania;
- Faculty of Applied Chemistry and Material Science, University Politehnica of Bucharest, 011061 Bucharest, Romania;
| | - Raluca Stan
- Faculty of Applied Chemistry and Material Science, University Politehnica of Bucharest, 011061 Bucharest, Romania;
| | - Alina Nicolescu
- “C.D. Nenitescu” Centre of Organic Chemistry, Romanian Academy, 060023 Bucharest, Romania;
- “Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, 700487 Iasi, Romania
- Correspondence: (A.N.); (C.D.)
| | - Calin Deleanu
- “C.D. Nenitescu” Centre of Organic Chemistry, Romanian Academy, 060023 Bucharest, Romania;
- “Petru Poni” Institute of Macromolecular Chemistry, Romanian Academy, 700487 Iasi, Romania
- Correspondence: (A.N.); (C.D.)
| | - Maria Dorobanțu
- Faculty of Medicine, “Carol Davila” University of Medicine and Pharmacy, 050513 Bucharest, Romania;
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Kogej K, Božič D, Kobal B, Herzog M, Černe K. Application of Dynamic and Static Light Scattering for Size and Shape Characterization of Small Extracellular Nanoparticles in Plasma and Ascites of Ovarian Cancer Patients. Int J Mol Sci 2021; 22:ijms222312946. [PMID: 34884751 PMCID: PMC8657631 DOI: 10.3390/ijms222312946] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 11/23/2021] [Indexed: 12/14/2022] Open
Abstract
In parallel to medical treatment of ovarian cancer, methods for the early detection of cancer tumors are being sought. In this contribution, the use of non-invasive static (SLS) and dynamic light scattering (DLS) for the characterization of extracellular nanoparticles (ENPs) in body fluids of advanced serous ovarian cancer (OC) and benign gynecological pathology (BP) patients is demonstrated and critically evaluated. Samples of plasma and ascites (OC patients) or plasma, peritoneal fluid, and peritoneal washing (BP patients) were analyzed. The hydrodynamic radius (Rh) and the radius of gyration (Rg) of ENPs were calculated from the angular dependency of LS intensity for two ENP subpopulations. Rh and Rg of the predominant ENP population of OC patients were in the range 20–30 nm (diameter 40–60 nm). In thawed samples, larger particles (Rh mostly above 100 nm) were detected as well. The shape parameter ρ of both particle populations was around 1, which is typical for spherical particles with mass concentrated on the rim, as in vesicles. The Rh and Rg of ENPs in BP patients were larger than in OC patients, with ρ ≈ 1.1–2, implying a more elongated/distorted shape. These results show that SLS and DLS are promising methods for the analysis of morphological features of ENPs and have the potential to discriminate between OC and BP patients. However, further development of the methodology is required.
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Affiliation(s)
- Ksenija Kogej
- Faculty of Chemistry and Chemical Technology, Department of Chemistry and Biochemistry, University of Ljubljana, SI-1000 Ljubljana, Slovenia;
- Correspondence:
| | - Darja Božič
- Faculty of Chemistry and Chemical Technology, Department of Chemistry and Biochemistry, University of Ljubljana, SI-1000 Ljubljana, Slovenia;
- Laboratory of Clinical Biophysics, Faculty of Health Sciences, University of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - Borut Kobal
- Division of Gynecology and Obstetrics, Department of Gynecology, University Medical Centre Ljubljana, SI-1000 Ljubljana, Slovenia; (B.K.); (M.H.)
- Faculty of Medicine, Department of Gynecology and Obstetrics, University of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - Maruša Herzog
- Division of Gynecology and Obstetrics, Department of Gynecology, University Medical Centre Ljubljana, SI-1000 Ljubljana, Slovenia; (B.K.); (M.H.)
- Faculty of Medicine, Department of Gynecology and Obstetrics, University of Ljubljana, SI-1000 Ljubljana, Slovenia
| | - Katarina Černe
- Faculty of Medicine, Department of Pharmacology and Experimental Toxicology, University of Ljubljana, SI-1000 Ljubljana, Slovenia;
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Gu C, Wang N, Ren P, Wu X, Pang B, Zhang S, Hou X, Xu D, Yuan Y, Liu G. Association between postprandial lipoprotein subclasses and Framingham cardiovascular disease risk stratification. Clin Biochem 2020; 89:51-57. [PMID: 33359967 DOI: 10.1016/j.clinbiochem.2020.12.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 12/18/2020] [Accepted: 12/20/2020] [Indexed: 11/15/2022]
Abstract
OBJECTIVE To determine the ability of postprandial lipoprotein subclass concentrations to stratify patients with respect to their risk for cardiovascular disease (CVD). METHODS Using the Framingham cardiovascular disease risk score (FRS) algorithm, a total of 112 consecutive patients referred for community health screening were stratified into two groups: (a) low-risk (FRS < 10%) and (b) intermediate/high-risk (FRS ≥ 10%). Serum lipoprotein subclass concentrations were determined by Vertical Auto Profile (VAP-II). RESULTS Fasting and postprandial levels of LDL4, HDL2, VLDL1 + 2, VLDL3, and RLP, as well as fasting levels of ApoB and postprandial levels of LDL3 and IDL1, were significantly different in the intermediate/high risk FRS group vs. the low-risk group (P < 0.05). Correlations between Framingham CVD risk and LDL3, LDL4, IDL1, VLDL1 + 2, VLDL3, RLP, and ApoB were positive while negative for HDL2 in both the fasting and postprandial states. Intermediate/high risk for CVD was shown to be significantly associated with both fasting and postprandial levels of VLDL1 + 2 and RLP, as well as with postprandial LDL4 and VLDL3, as determined using forward conditional logistic regression analysis. Postprandial levels of VLDL1 + 2 were better at identifying patients in the intermediate/high-risk FRS group than fasting levels, although the differences were not significant due to overlapping reference intervals. In addition, the association between RLP and VLDL subclasses relative to Framingham CVD risk increased significantly in the postprandial state (ΔR2 = 0.023; ΔF = 7.178; ΔP = 0.025) but not in the fasting state. CONCLUSIONS The use of postprandial lipoprotein subclass concentrations is not inferior to the use of fasting levels in identifying intermediate/high-risk FRS individuals. In addition, changes in RLP and VLDL subclass concentrations in fasting vs. postprandial states may reveal lipid metabolic mechanisms associated with CVD.
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Affiliation(s)
- Chun Gu
- Department of Laboratory, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, China
| | - Na Wang
- Department of Laboratory, Southern District of Guang'anmen Hospital, China Academy of Chinese Medical Sciences, China
| | - Peng Ren
- Department of Laboratory, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, China
| | - Xuemei Wu
- Department of Laboratory, Southern District of Guang'anmen Hospital, China Academy of Chinese Medical Sciences, China
| | - Bo Pang
- Department of Laboratory, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, China
| | - Shuying Zhang
- Department of Laboratory, Southern District of Guang'anmen Hospital, China Academy of Chinese Medical Sciences, China
| | - Xueyun Hou
- Department of Laboratory, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, China
| | - Dan Xu
- Department of Laboratory, Southern District of Guang'anmen Hospital, China Academy of Chinese Medical Sciences, China
| | - Yuliang Yuan
- Department of Laboratory, Southern District of Guang'anmen Hospital, China Academy of Chinese Medical Sciences, China.
| | - Guijian Liu
- Department of Laboratory, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, China.
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Smy L, De Biase I, Genzen JR, Yuzyuk T. The nuclear magnetic resonance metabolic profile: Impact of fasting status. Clin Biochem 2020; 87:85-92. [PMID: 33159964 DOI: 10.1016/j.clinbiochem.2020.10.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 10/20/2020] [Accepted: 10/27/2020] [Indexed: 10/23/2022]
Abstract
INTRODUCTION Measurement of lipoprotein subclass concentration (-c), particle number (-p), and size (-s) by nuclear magnetic resonance (NMR) has gained traction in the clinical laboratory due to associations between smaller lipid particle sizes and atherogenic risk, especially for LDL-p. The standard protocols for lipoprotein measurements by NMR require fasting blood samples; however, patients may not fast properly before sample collection. The study objective was to evaluate the impact of fasting status on the NMR-based lipid profile and to identify key parameters differentiating between fasting and post-meal specimens. METHODS Forty-eight self-reported healthy male and female participants were recruited. Blood was collected after a 12 h fast and 4 h after a high fat meal. Samples were analyzed using the AXINON LipoFIT by NMR assay. The measurements included triglyceride, total cholesterol, IDL-c, and LDL, HDL, VLDL concentration, particle number, and size, as well as glucose, and four amino acids (alanine, valine, leucine and isoleucine). RESULTS As expected, triglycerides increased after the meal (58%, p < 0.0001). Significant changes were also observed for VLDL, LDL, and HDL parameters, and the branched chain amino acids. The ratio of Valine*VLDL-c/LDL-c or Isoleucine*VLDL-c/LDL-c provided equally effective differentiation of fasting and post-meal samples. The ratio cutoffs (79.1 and 23.6 when calculated using valine and isoleucine, respectively) had sensitivities of 86% and specificities of 93-95%. CONCLUSIONS The clinical impact on NMR results from post-meal samples warrants further evaluation. Algorithms to differentiate fasting and post-meal specimens may be useful in identifying suboptimal specimens.
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Affiliation(s)
- Laura Smy
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT, United States
| | - Irene De Biase
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT, United States; ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT, United States
| | - Jonathan R Genzen
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT, United States; ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT, United States
| | - Tatiana Yuzyuk
- Department of Pathology, University of Utah School of Medicine, Salt Lake City, UT, United States; ARUP Institute for Clinical and Experimental Pathology, Salt Lake City, UT, United States
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