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Koska J, Hu Y, Furtado J, Billheimer D, Nedelkov D, Allison M, Budoff MJ, McClelland RL, Reaven P. Association of apolipoproteins C-I and C-II truncations with coronary heart disease and progression of coronary artery calcium: Multi-Ethnic Study of Atherosclerosis. Atherosclerosis 2023; 380:117214. [PMID: 37573768 PMCID: PMC10810047 DOI: 10.1016/j.atherosclerosis.2023.117214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2023] [Revised: 07/18/2023] [Accepted: 08/02/2023] [Indexed: 08/15/2023]
Abstract
BACKGROUND AND AIMS Higher truncated-to-native proteoform ratios of apolipoproteins (apo) C-I (C-I'/C-I) and C-II (C-II'/C-II) are associated with less atherogenic lipid profiles. We examined prospective relationships of C-I'/C-II and C-II'/C-II with coronary heart disease (CHD) and coronary artery calcium (CAC). METHODS ApoC-I and apoC-II proteoforms were measured by mass spectrometry immunoassay in 5790 MESA baseline plasma samples. CHD events (myocardial infarction, resuscitated cardiac arrest, fatal CHD, n = 434) were evaluated for up to 17 years. CAC was measured 1-4 times over 10 years for incident CAC (if baseline CAC = 0), and changes (follow-up adjusted for baseline) in CAC score and density (if baseline CAC>0). RESULTS C-II'/C-II was inversely associated with CHD (n = 434 events) after adjusting for non-lipid cardiovascular risk factors (Hazard ratio: 0.89 [95% CI: 0.81-0.98] per SD), however, the association was attenuated after further adjustment for HDL levels (0.93 [0.83-1.03]). There was no association between C-I'/C-I and CHD (0.98 [0.88-1.08]). C-II'/C-II was positively associated with changes in CAC score (3.4% [95%CI: 0.6, 6.3]) and density (6.3% [0.3, 4.2]), while C-I'/C-I was inversely associated with incident CAC (Risk ratio: 0.89 [95% CI: 0.81, 0.98]) in fully adjusted models that included plasma lipids. Total apoC-I and apoC-II concentrations were not associated with CHD, incident CAC or change in CAC score. CONCLUSIONS Increased apoC-II truncation was associated with reduced CHD, possibly explained by differences in lipid metabolism. Increased apoC-I and apoC-II truncations were also associated with less CAC progression and/or development of denser coronary plaques.
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Affiliation(s)
- Juraj Koska
- Phoenix VA Health Care System, 650 E Indian School Rd CS111E, Phoenix, AZ, 85012, USA.
| | - Yueming Hu
- Isoformix Inc., 9830 S. 51st Suite B-113, Phoenix, AZ, 85044, USA
| | - Jeremy Furtado
- Harvard T.H. Chan School of Public Health, 677 Huntington Ave, Boston, MA, 02115, USA
| | - Dean Billheimer
- Mel and Enid Zuckerman College of Public Health, University of Arizona, 1295 N Martin Ave, Tucson, AZ, 85724, USA
| | - Dobrin Nedelkov
- Isoformix Inc., 9830 S. 51st Suite B-113, Phoenix, AZ, 85044, USA
| | - Matthew Allison
- Department of Family Medicine, University of California San Diego, 9500 Gilman Drive, La Jolla, CA, 92093, USA
| | - Matthew J Budoff
- Lundquist Institute at Harbor-University of California, Los Angeles (UCLA), 1124 W Carson St., Torrance, CA, 90502, USA
| | - Robyn L McClelland
- Department of Biostatistics, University of Washington, 6200 NE 74th St. Bldg. 29 Suite 210, Seattle, WA, 98115, USA
| | - Peter Reaven
- College of Health Solutions, Arizona State University, 550 N 3rd St, Phoenix, AZ, 85004, USA
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Rouland A, Masson D, Lagrost L, Vergès B, Gautier T, Bouillet B. Role of apolipoprotein C1 in lipoprotein metabolism, atherosclerosis and diabetes: a systematic review. Cardiovasc Diabetol 2022; 21:272. [PMID: 36471375 PMCID: PMC9724408 DOI: 10.1186/s12933-022-01703-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 11/21/2022] [Indexed: 12/12/2022] Open
Abstract
Apolipoprotein C1 (apoC1) is a small size apolipoprotein whose exact role is not totally clarified but which seems to modulate significantly the metabolism of lipoproteins. ApoC1 is involved in the metabolism of triglyceride-rich lipoproteins by inhibiting the binding of very low density lipoproteins (VLDL) to VLDL-receptor (VLDL-R), to low density lipoprotein receptor (LDL-R) and to LDL receptor related protein (LRP), by reducing the activity of lipoprotein lipase (LPL) and by stimulating VLDL production, all these effects leading to increase plasma triglycerides. ApoC1 takes also part in the metabolism of high density lipoproteins (HDL) by inhibiting Cholesterol Ester Transfer Protein (CETP). The functionality of apoC1 on CETP activity is impaired in diabetes that might account, at least in part, for the increased plasma CETP activity observed in patients with diabetes. Its different effects on lipoprotein metabolism with a possible role in the modulation of inflammation makes the net impact of apoC1 on cardiometabolic risk difficult to figure out and apoC1 might be considered as pro-atherogenic or anti-atherogenic depending on the overall metabolic context. Making the link between total plasma apoC1 levels and the risk of cardio-metabolic diseases is difficult due to the high exchangeability of this small protein whose biological effects might depend essentially on its association with VLDL or HDL. The role of apoC1 in humans is not entirely elucidated and further studies are needed to determine its precise role in lipid metabolism and its possible pleiotropic effects on inflammation and vascular wall biology. In this review, we will present data on apoC1 structure and distribution among lipoproteins, on the effects of apoC1 on VLDL metabolism and HDL metabolism and we will discuss the possible links between apoC1, atherosclerosis and diabetes.
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Affiliation(s)
- Alexia Rouland
- grid.31151.37Endocrinology and Diabetology Unit, University Hospital, Dijon, France ,grid.493090.70000 0004 4910 6615INSERM/University of Bourgogne Franche-Comté, LNC UMR1231, Dijon, France
| | - David Masson
- grid.493090.70000 0004 4910 6615INSERM/University of Bourgogne Franche-Comté, LNC UMR1231, Dijon, France ,LipSTIC LabEx, UFR Sciences de Santé, Dijon, France
| | - Laurent Lagrost
- grid.493090.70000 0004 4910 6615INSERM/University of Bourgogne Franche-Comté, LNC UMR1231, Dijon, France ,LipSTIC LabEx, UFR Sciences de Santé, Dijon, France
| | - Bruno Vergès
- grid.31151.37Endocrinology and Diabetology Unit, University Hospital, Dijon, France ,grid.493090.70000 0004 4910 6615INSERM/University of Bourgogne Franche-Comté, LNC UMR1231, Dijon, France
| | - Thomas Gautier
- grid.493090.70000 0004 4910 6615INSERM/University of Bourgogne Franche-Comté, LNC UMR1231, Dijon, France ,LipSTIC LabEx, UFR Sciences de Santé, Dijon, France
| | - Benjamin Bouillet
- grid.31151.37Endocrinology and Diabetology Unit, University Hospital, Dijon, France ,grid.493090.70000 0004 4910 6615INSERM/University of Bourgogne Franche-Comté, LNC UMR1231, Dijon, France ,grid.31151.37Service Endocrinologie, Diabétologie et Maladies Métaboliques, Hôpital François Mitterrand, CHU Dijon, BP 77908, 21079 Dijon, France
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The Importance of Lipoprotein Lipase Regulation in Atherosclerosis. Biomedicines 2021; 9:biomedicines9070782. [PMID: 34356847 PMCID: PMC8301479 DOI: 10.3390/biomedicines9070782] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 07/02/2021] [Accepted: 07/04/2021] [Indexed: 02/07/2023] Open
Abstract
Lipoprotein lipase (LPL) plays a major role in the lipid homeostasis mainly by mediating the intravascular lipolysis of triglyceride rich lipoproteins. Impaired LPL activity leads to the accumulation of chylomicrons and very low-density lipoproteins (VLDL) in plasma, resulting in hypertriglyceridemia. While low-density lipoprotein cholesterol (LDL-C) is recognized as a primary risk factor for atherosclerosis, hypertriglyceridemia has been shown to be an independent risk factor for cardiovascular disease (CVD) and a residual risk factor in atherosclerosis development. In this review, we focus on the lipolysis machinery and discuss the potential role of triglycerides, remnant particles, and lipolysis mediators in the onset and progression of atherosclerotic cardiovascular disease (ASCVD). This review details a number of important factors involved in the maturation and transportation of LPL to the capillaries, where the triglycerides are hydrolyzed, generating remnant lipoproteins. Moreover, LPL and other factors involved in intravascular lipolysis are also reported to impact the clearance of remnant lipoproteins from plasma and promote lipoprotein retention in capillaries. Apolipoproteins (Apo) and angiopoietin-like proteins (ANGPTLs) play a crucial role in regulating LPL activity and recent insights into LPL regulation may elucidate new pharmacological means to address the challenge of hypertriglyceridemia in atherosclerosis development.
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Fuior EV, Gafencu AV. Apolipoprotein C1: Its Pleiotropic Effects in Lipid Metabolism and Beyond. Int J Mol Sci 2019; 20:ijms20235939. [PMID: 31779116 PMCID: PMC6928722 DOI: 10.3390/ijms20235939] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 11/19/2019] [Accepted: 11/21/2019] [Indexed: 12/20/2022] Open
Abstract
Apolipoprotein C1 (apoC1), the smallest of all apolipoproteins, participates in lipid transport and metabolism. In humans, APOC1 gene is in linkage disequilibrium with APOE gene on chromosome 19, a proximity that spurred its investigation. Apolipoprotein C1 associates with triglyceride-rich lipoproteins and HDL and exchanges between lipoprotein classes. These interactions occur via amphipathic helix motifs, as demonstrated by biophysical studies on the wild-type polypeptide and representative mutants. Apolipoprotein C1 acts on lipoprotein receptors by inhibiting binding mediated by apolipoprotein E, and modulating the activities of several enzymes. Thus, apoC1 downregulates lipoprotein lipase, hepatic lipase, phospholipase A2, cholesterylester transfer protein, and activates lecithin-cholesterol acyl transferase. By controlling the plasma levels of lipids, apoC1 relates directly to cardiovascular physiology, but its activity extends beyond, to inflammation and immunity, sepsis, diabetes, cancer, viral infectivity, and-not last-to cognition. Such correlations were established based on studies using transgenic mice, associated in the recent years with GWAS, transcriptomic and proteomic analyses. The presence of a duplicate gene, pseudogene APOC1P, stimulated evolutionary studies and more recently, the regulatory properties of the corresponding non-coding RNA are steadily emerging. Nonetheless, this prototypical apolipoprotein is still underexplored and deserves further research for understanding its physiology and exploiting its therapeutic potential.
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Affiliation(s)
- Elena V. Fuior
- Institute of Cellular Biology and Pathology “N. Simionescu”, 050568 Bucharest, Romania;
| | - Anca V. Gafencu
- Institute of Cellular Biology and Pathology “N. Simionescu”, 050568 Bucharest, Romania;
- Correspondence:
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The majority of lipoprotein lipase in plasma is bound to remnant lipoproteins: A new definition of remnant lipoproteins. Clin Chim Acta 2016; 461:114-25. [DOI: 10.1016/j.cca.2016.06.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Revised: 06/18/2016] [Accepted: 06/20/2016] [Indexed: 12/17/2022]
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Gautier T, Masson D, Lagrost L. The potential of cholesteryl ester transfer protein as a therapeutic target. Expert Opin Ther Targets 2015. [PMID: 26212254 DOI: 10.1517/14728222.2015.1073713] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Over recent decades, attempts to ascertain the pro-atherogenic nature of plasma cholesteryl ester transfer protein (CETP) and to establish the relevance of its pharmacological blockade as a promising high density lipoproteins-raising and anti-atherogenic therapy have been disappointing. AREAS COVERED The current review focuses on CETP as a multifaceted protein, on genetic variations at the CETP gene and on their possible consequences for cardiovascular risk in human populations. Specific attention is given to physiological modulation of endogenous CETP activity by the apoC1 inhibitor. Finally, the rationale behind the need for selection of patients to treat is discussed in the light of recent studies. EXPERT OPINION At this stage one can only speculate on the clinical outcome of pharmacological CETP inhibitors in high-risk populations, but recent advances give cause to adjust the expectations from now on. The CETP effect is probably largely influenced by the overall metabolic state, and whether CETP blockade may be relevant or not in promoting cholesterol disposal is still questioned. The possible need for a careful stratification of patients to treat with CETP inhibitors is outlined. Finally, manipulation of CETP activity should be considered with caution in the context of sepsis and infectious diseases.
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Affiliation(s)
- Thomas Gautier
- a 1 INSERM, LNC UMR866 , F-21000 Dijon, France.,b 2 University of Bourgogne Franche-Comté , F-21000 Dijon, France.,c 3 LipSTIC LabEx, Fondation de Coopération Scientifique Bourgogne-Franche Comté , F-21000 Dijon, France
| | - David Masson
- a 1 INSERM, LNC UMR866 , F-21000 Dijon, France.,b 2 University of Bourgogne Franche-Comté , F-21000 Dijon, France.,c 3 LipSTIC LabEx, Fondation de Coopération Scientifique Bourgogne-Franche Comté , F-21000 Dijon, France.,d 4 University Hospital of Dijon , F-21000 Dijon, France
| | - Laurent Lagrost
- a 1 INSERM, LNC UMR866 , F-21000 Dijon, France.,b 2 University of Bourgogne Franche-Comté , F-21000 Dijon, France.,c 3 LipSTIC LabEx, Fondation de Coopération Scientifique Bourgogne-Franche Comté , F-21000 Dijon, France.,d 4 University Hospital of Dijon , F-21000 Dijon, France.,e 5 UMR866, UFR Sciences de Santé, 7 boulevard Jeanne d'Arc , F-21000 Dijon, France
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Wassef H, Salem H, Bissonnette S, Baass A, Dufour R, Davignon J, Faraj M. White adipose tissue apolipoprotein C-I secretion in relation to delayed plasma clearance of dietary fat in humans. Arterioscler Thromb Vasc Biol 2012; 32:2785-93. [PMID: 22995522 DOI: 10.1161/atvbaha.112.300306] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE White adipose tissue (WAT) dysfunction is characterized by delayed clearance of dietary triglyceride-rich lipoproteins (TRL). We reported that apolipoprotein (apo) C-I, a transferable apolipoprotein that inhibits lipoprotein lipase activity when bound to TRL, was produced by a human adipocyte model. Thus, we aimed to determine whether increased WAT apoC-I secretion is related to delayed dietary fat clearance in humans. METHODS AND RESULTS After the ingestion of a (13)C-triolein-labeled high-fat meal, postmenopausal obese women with high-fasting WAT apoC-I secretion (median >0.81 μmol/L per g/4 hours, n=9) had delayed postprandial plasma clearance of (13)C-triglyceride and (13)C-nonesterified fatty acids over 6 hours compared with controls. WAT apoC-I secretion over 4 hours correlated with fasting total and non-high-density lipoprotein apoC-I but not with high-density lipoprotein apoC-I and was the primary predictor of 4-hour postprandial increases in TRL apoC-I. Correction for TRL apoC-I eliminated the association of WAT apoC-I with 6-hour area under the curve of plasma (13)C-triglyceride; correction for insulin sensitivity or inflammation did not. Finally, in addition to apoC-I, WAT secreted considerable amount of apoC-II, apoC-III, and apoE over 24 hours; however, only WAT apoC-I secretion was associated with 6-hour area under the curve of plasma (13)C-triglyceride. CONCLUSIONS Increased WAT apoC-I secretion in obese women is associated with delayed postprandial dietary fat clearance mediated by increased TRL apoC-I. Thus, we hypothesize that reducing WAT apoC-I secretion ameliorates WAT dysfunction and associated cardiometabolic risks in humans.
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Affiliation(s)
- Hanny Wassef
- Institut de recheches cliniques de Montréal (IRCM), Montréal, Québec, Canada
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8
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Kwiterovich PO, Virgil DG, Chu AY, Khouzami VA, Alaupovic P, Otvos JD. Interrelationships between the concentration and size of the largest high-density lipoprotein subfraction and apolipoprotein C-I in infants at birth and follow-up at 2-3 months of age and their parents. J Clin Lipidol 2012; 7:29-37. [PMID: 23351580 DOI: 10.1016/j.jacl.2012.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 08/29/2012] [Accepted: 09/13/2012] [Indexed: 11/30/2022]
Abstract
BACKGROUND Lipoprotein subfractions in infants may predict the risk of cardiovascular disease factors in children. OBJECTIVE To examine the relationships between lipid and nonlipid factors and lipoprotein subfractions in infants at birth and follow-up (FU) and in their parents. METHODS Prospective study in a community-based hospital of 103 families ascertained through a pregnant mother at 36 weeks gestation or older. Of 103 infants studied at birth, 85 were sampled at FU at 2-3 months of age, along with 76 fathers. Lipids, lipoproteins, and their subclasses were determined by nuclear magnetic resonance spectroscopy. Correlations of lipid-related parameters were calculated using Spearman rank correlations. RESULTS Female gender in infants and use of formula only were the only nonlipid variables associated with lipoprotein subfractions. LDL parameters were significantly correlated between infants at birth and FU. The largest high-density lipoprotein subfraction, H5C, was the only lipid variable significantly associated between mothers and infants at birth. Paternal low-density lipoprotein size was significantly correlated with that of infants at FU but not at birth. In each of the four groups, markedly inverse interrelationships were found between H5C and small LDL particles. At birth and at FU, apoC-I was strongly related with H5C but not TG. Conversely, apoC-I in the parents was strongly related with TG but not H5C. CONCLUSION Significant relationships were found between lipoprotein subfractions within infants at birth and FU and their parents. ApoC-I and H5C levels very early in life may affect the development of dyslipidemia and obesity in childhood.
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Tajiri Y, Mimura K, Umeda F. High-Sensitivity C-Reactive Protein in Japanese Patients with Type 2 Diabetes. ACTA ACUST UNITED AC 2012; 13:1810-6. [PMID: 16286529 DOI: 10.1038/oby.2005.220] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To assess the relationship between high-sensitivity (HS) C-reactive protein (CRP) and metabolic syndrome (MetS) or atherosclerosis and to assess effects of strict metabolic control on the degree of inflammation and MetS in patients with type 2 diabetes. RESEARCH METHODS AND PROCEDURES Four hundred thirteen patients with diabetes were enrolled in the cross-sectional study. Of these 413 patients, 161 patients were further admitted for 2.4 +/- 0.4 weeks (mean +/- SD) to investigate the change in HS-CRP or other parameters under strict metabolic control. RESULTS Log-transformed HS-CRP value (log HS-CRP) was strongly correlated with BMI (r = 0.448, p < 0.01). Log HS-CRP was also correlated with the presence of MetS or each component of MetS. Furthermore, a positive significant trend in HS-CRP levels was shown with an increasing number of MetS components (p < 0.05). Log HS-CRP showed a significant positive correlation with carotid artery intima-media thickness (IMT) (r = 0.152, p < 0.01). In multiple step-wise regression analysis, BMI, hemoglobin A(1c), right IMT, duration of diabetes, and triglyceride were selected as explanatory variables for log HS-CRP (R2 = 0.412). Under strict metabolic control, HS-CRP was significantly (p < 0.01) lower, together with lower levels of other markers for MetS. The change in HS-CRP was significantly correlated with the change in BMI (r = 0.161, p = 0.04). DISCUSSION In subjects with type 2 diabetes, HS-CRP levels are related to MetS and subclinical atherosclerosis. Strict weight management and metabolic control were associated with a reduction in HS-CRP levels, and changes in HS-CRP were related to changes in weight, supporting the hypothesis that lifestyle modification reduces inflammation and the risk of CHD.
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Affiliation(s)
- Yuji Tajiri
- Endocrinology and Metabolism Division, Fukuoka Medical Association Hospital, Fukuoka 814-8522, Japan.
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10
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Li RX, Ding YB, Zhao SL, Xiao YY, Li QR, Xia FY, Sun L, Lin X, Wu JR, Liao K, Zeng R. Secretome-Derived Isotope Tags (SDIT) Reveal Adipocyte-Derived Apolipoprotein C-I as a Predictive Marker for Cardiovascular Disease. J Proteome Res 2012; 11:2851-62. [DOI: 10.1021/pr201224e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rong-Xia Li
- Key Laboratory of Systems Biology,
Institute of Biochemistry and Cell Biology, Shanghai Institutes for
Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Yu-Bo Ding
- State Key Laboratory of Cell
Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes
for Biological Sciences, Graduate School, Chinese Academy of Sciences, Shanghai 200031, China
| | - Shi-Lin Zhao
- Key Laboratory of Systems Biology,
Institute of Biochemistry and Cell Biology, Shanghai Institutes for
Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Yuan-Yuan Xiao
- State Key Laboratory of Cell
Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes
for Biological Sciences, Graduate School, Chinese Academy of Sciences, Shanghai 200031, China
| | - Qing-run Li
- Key Laboratory of Systems Biology,
Institute of Biochemistry and Cell Biology, Shanghai Institutes for
Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Fang-Ying Xia
- Key Laboratory of Systems Biology,
Institute of Biochemistry and Cell Biology, Shanghai Institutes for
Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Liang Sun
- Key Laboratory of Nutrition and
Metabolism, Institute for Nutritional Sciences, Shanghai Institutes
for Biological Sciences, Chinese Academy of Sciences and Graduate School of the Chinese Academy of Sciences, Shanghai,
China
| | - Xu Lin
- Key Laboratory of Nutrition and
Metabolism, Institute for Nutritional Sciences, Shanghai Institutes
for Biological Sciences, Chinese Academy of Sciences and Graduate School of the Chinese Academy of Sciences, Shanghai,
China
| | - Jia-Rui Wu
- Key Laboratory of Systems Biology,
Institute of Biochemistry and Cell Biology, Shanghai Institutes for
Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Kan Liao
- State Key Laboratory of Cell
Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes
for Biological Sciences, Graduate School, Chinese Academy of Sciences, Shanghai 200031, China
| | - Rong Zeng
- Key Laboratory of Systems Biology,
Institute of Biochemistry and Cell Biology, Shanghai Institutes for
Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
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11
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The apolipoprotein C-I content of very-low-density lipoproteins is associated with fasting triglycerides, postprandial lipemia, and carotid atherosclerosis. J Lipids 2011; 2011:271062. [PMID: 21776394 PMCID: PMC3139117 DOI: 10.1155/2011/271062] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2011] [Accepted: 05/02/2011] [Indexed: 11/26/2022] Open
Abstract
Background. Experimental studies in animals suggest that apolipoprotein (apo) C-I is an important regulator of triglycerides in fasting and postprandial conditions and associated with carotid atherosclerosis.
Methods. A cross-sectional study was conducted with 81 subjects, aged 56–80 years recruited from a population health survey. The participants underwent a fat tolerance test (1 g fat per Kg body weight) and carotid atherosclerosis was determined by ultrasound examination. VLDL particles, Sf 20–400, were isolated and their lipid composition and apoC-I content determined.
Results. The carotid plaque area increased linearly with the number of apoC-I molecules per VLDL particles (P = 0.048) under fasting conditions. Fasting triglycerides increased across tertiles of apoC-I per VLDL particle in analyses adjusted for apoC-II and -C-III, apoE genotype and traditional cardiovascular risk factors (P = 0.011). The relation between apoC-I in VLDL and serum triglycerides was conveyed by triglyceride enrichment of VLDL particles (P for trend <0.001. The amount of apoC-I molecules per VLDL was correlated with the total (r = 0.41, P < 0.0001) and incremental (r = 0.35, P < 0.001) area under the postprandial triglyceride curve.
Conclusions. Our findings support the concept that the content of apoC-I per VLDL particle is an important regulator of triglyceride metabolism in the fasting and postprandial state and associated with carotid athrosclerosis.
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12
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Diez D, Wheelock AM, Goto S, Haeggström JZ, Paulsson-Berne G, Hansson GK, Hedin U, Gabrielsen A, Wheelock CE. The use of network analyses for elucidating mechanisms in cardiovascular disease. MOLECULAR BIOSYSTEMS 2009; 6:289-304. [PMID: 20094647 DOI: 10.1039/b912078e] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Systems biology offers the potential to provide new insights into our understanding of the pathogenesis of complex diseases such as atherosclerosis. It seeks to comprehend the system properties of the non-linear interactions of the multiple biomolecular components that characterize a living organism. An important component of this research approach is identifying the biological networks that connect the differing elements of a system and in the process describe the characteristics that define a shift in equilibrium from a healthy to a diseased state. The utility of this method becomes clear when applied to multifactorial diseases with complex etiologies such as inflammatory-related diseases, herein exemplified by cardiovascular disease. In this study, the application of network theory to systems biology is described in detail and an example is provided using data from a clinical biobank database of carotid endarterectomies from the Karolinska University Hospital (Biobank of Karolinska Endarterectomies, BiKE). Data from 47 microarrays were examined using a combination of Bioconductor modules and the Cytoscape resource with several associated plugins to analyze the transcriptomics data and create a combined gene association and correlation network of atherosclerosis. The methodology and workflow are described in detail, with a total of 43 genes found to be differentially expressed on a gender-specific basis, of which 15 were not directly linked to the sex chromosomes. In particular, the APOC1 gene was 2.1-fold down-regulated in plaques in women relative to men and was selected for further analysis based upon a purported role in cardiovascular disease. The resulting network was identified as a scale-free network that contained specific sub-networks related to immune function and lipid biosynthesis. These sub-networks link atherosclerotic-related genes to other genes that may not have previously known roles in disease etiology and only evidence small alterations, which are challenging to find by statistical and comparison-based methods. A number of Gene Ontology (GO), BioCarta and KEGG pathways involved in the atherosclerotic process were identified in the constructed sub-network, with 19 GO pathways related to APOC1 of which 'phospholipid efflux' evidenced the strongest association. The utility and functionality of network analysis and the different Cytoscape plugins employed are discussed. Lastly, the applications of these methods to cardiovascular disease are discussed with focus on the current limitations and future visions of this emerging field.
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Affiliation(s)
- Diego Diez
- Bioinformatics Center, Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
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13
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Hopkins PN, Nanjee MN, Wu LL, McGinty MG, Brinton EA, Hunt SC, Anderson JL. Altered composition of triglyceride-rich lipoproteins and coronary artery disease in a large case-control study. Atherosclerosis 2009; 207:559-66. [PMID: 19524242 DOI: 10.1016/j.atherosclerosis.2009.05.016] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2008] [Revised: 05/11/2009] [Accepted: 05/16/2009] [Indexed: 12/31/2022]
Abstract
BACKGROUND Traditional beta-quantification of plasma lipoproteins by ultracentrifugation separates triglyceride-rich lipoproteins (TGRL) from higher density lipoproteins. The cholesterol in the TGRL fraction is referred to as measured very low-density lipoprotein cholesterol (VLDL-C) recognizing that other TGRL may be present. The measured VLDL-C to total plasma triglyceride (VLDL-C/TG) has long been considered an index of average TGRL composition with abnormally high VLDL-C/TG ratios (>or=0.30 with TG>150mg/dL) indicative of atherogenic remnant accumulation (type III hyperlipidemia). However, virtually no reports are available which examine potential associations between CAD and VLDL-C/TG at the lower end of the spectrum. METHODS AND RESULTS We performed ultracentrifugation in 1170 cases with premature-onset, familial CAD and 1759 population-based controls and examined the VLDL-C/TG ratio as an index of TGRL composition. As expected, we found very high CAD risk associated with severe type III hyperlipidemia (OR 10.5, p=0.02). Unexpectedly, however, we found a robust, graded, and independent association between CAD risk and lower than average VLDL-C/TG ratios (p<0.0001 as ordered categories or as a continuous variable). Among those in the lowest VLDL-C/TG category (a ratio <0.12), CAD risk was clearly increased (OR 4.5, 95% CI 2.9-6.9) and remained significantly elevated in various subgroups including those with triglycerides below 200mg/dl, in males and females separately, as well as among those with no traditional CAD risk factors (OR 5.8, 95% CI 1.5-22). Significant compositional differences by case status were confirmed in a subset whose samples were re-spun with measurement of lipids and apolipoprotein B (apo B) in each subfraction. CONCLUSIONS We found a strong, graded, independent, and robust association between CAD and lower VLDL-C/TG ratios. We consider this a novel, hypothesis-generating observation which will hopefully generate additional future studies to provide confirmation and further insight into potential mechanisms.
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Affiliation(s)
- Paul N Hopkins
- Cardiovascular Genetics Research, Department of Internal Medicine, Cardiology Division, University of Utah School of Medicine, Salt Lake City, UT 84108, USA.
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Can serum apolipoprotein C-I demonstrate metabolic abnormality early in women with polycystic ovary syndrome? Fertil Steril 2009; 94:205-10. [PMID: 19368908 DOI: 10.1016/j.fertnstert.2009.03.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2009] [Revised: 02/25/2009] [Accepted: 03/02/2009] [Indexed: 11/22/2022]
Abstract
OBJECTIVE To evaluate the role of apolipoprotein C-I (apoC-I) levels and assess relationships between apoC-I and clinical features in women with polycystic ovary syndrome (PCOS). DESIGN Prospective study. SETTING Reproductive Center of Peking University Third Hospital. PATIENT(S) Thirty patients with PCOS with insulin resistance, 30 patients with PCOS without insulin resistance, and 30 control individuals. INTERVENTION(S) Fasting serum samples. MAIN OUTCOME MEASURE(S) Measures of serum apoC-I, androgens, total cholesterol, triglycerides, high-density lipoprotein cholesterol, low-density lipoprotein cholesterol, apoA1, apoB, heat-shock C-reactive protein, glucose, and homeostasis model assessment of insulin resistance (HOMA-IR). RESULT(S) We found differentially expressed proteins by use of the surface-enhanced laser adsorption/ionization (SELDI) protein chip in the serum of women with PCOS and controls. Of these, apoC-I, was highly up-regulated. ApoC-I is associated with glycometabolism and lipid metabolism, but its role in PCOS has been unknown. The serum levels of apoC-I in the patients with PCOS were statistically significantly elevated compared with those of controls, especially in women with insulin resistance. The lean PCOS women had higher apoC-I levels than controls. In patients with PCOS and without any abnormal serum lipid index, apoC-I levels were still higher than in controls. Analysis showed that apoC-I correlated with body mass index, triglycerides, high-density lipoprotein cholesterol, apoA1, and HOMA-IR. CONCLUSION(S) ApoC-I may have an important role in glucose and lipid metabolism, and may be useful for early demonstration of metabolic abnormality in women with PCOS.
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Apolipoprotein CI levels are associated with atherosclerosis in men with the metabolic syndrome and systemic inflammation. Atherosclerosis 2009; 203:355-7. [DOI: 10.1016/j.atherosclerosis.2008.08.011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2008] [Revised: 08/01/2008] [Accepted: 08/01/2008] [Indexed: 11/23/2022]
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Pavoine C, Pecker F. Sphingomyelinases: their regulation and roles in cardiovascular pathophysiology. Cardiovasc Res 2009; 82:175-83. [PMID: 19176603 DOI: 10.1093/cvr/cvp030] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Sphingomyelinases (SMases) hydrolyse sphingomyelin, releasing ceramide and creating a cascade of bioactive lipids. These lipids include sphingosine and sphingosine-1-phosphate, all of which have a specific signalling capacity. Sphingomyelinase activation occurs in different cardiovascular system cell types, namely cardiac myocytes, endothelial and vascular smooth muscle cells, mediating cell proliferation, cell death, and contraction of cardiac and vascular myocytes. Three main types of SMases contribute to cardiovascular physiology: the lysosomal and secreted acidic SMases (L- and S-ASMases, respectively) and the membrane neutral SMase (NSMase). These three enzymes have common activators, including ischaemia/reperfusion stress and proinflammatory cytokines, but they differ in their enzymatic properties and subcellular locations that determine the final effect of enzyme activation. This review focuses on the recent advances in the understanding of ASMase and NSMase pathways and their specific contribution to cardiovascular pathophysiology. Current knowledge indicates that the inhibitors of the different SMase types are potential tools for the treatment of cardiovascular diseases. Acid SMase inhibitors could be tools against post-ischaemia reperfusion injury and in the treatment of atherosclerosis. Neutral SMase inhibitors could be tools for the treatment of atherosclerosis, heart failure, and age-related decline in vasomotion. However, the design of bioavailable and more specific SMase-type inhibitors remains a challenge.
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Notø ATW, Mathiesen EB, Brox J, Björkegren J, Hansen JB. The ApoC-I Content of VLDL Particles is Associated with Plaque Size in Persons with Carotid Atherosclerosis. Lipids 2008; 43:673-9. [DOI: 10.1007/s11745-008-3193-2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2007] [Accepted: 04/02/2008] [Indexed: 10/22/2022]
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Hamsten A, Silveira A, Boquist S, Tang R, Bond MG, de Faire U, Björkegren J. The apolipoprotein CI content of triglyceride-rich lipoproteins independently predicts early atherosclerosis in healthy middle-aged men. J Am Coll Cardiol 2005; 45:1013-7. [PMID: 15808756 DOI: 10.1016/j.jacc.2004.12.049] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2004] [Accepted: 12/06/2004] [Indexed: 11/16/2022]
Abstract
OBJECTIVES In this study, we examined the apolipoprotein (apo) CI content of triglyceride-rich lipoproteins (TRLs) in relation to established coronary heart disease (CHD) risk factors and early atherosclerosis. BACKGROUND In Western society, the postprandial state constitutes a nearly constant stress on the vasculature and the metabolism of lipoproteins. Delayed clearance of postprandial TRL remnants has repeatedly been associated with premature CHD and may include the enrichment of these remnants with apoCI. METHODS We examined 72 healthy 50-year-old men with an apoE3/E3 genotype who had undergone an oral fat load test and B-mode ultrasound examination of the intima-media thickness (IMT) of the common carotid artery. RESULTS In the fasting state, plasma, very-low-density lipoprotein (VLDL), and low-density lipoprotein cholesterol, proinsulin, and apoB100-containing intermediate density lipoprotein levels were related to IMT (p < 0.05). In the postprandial state, IMT was related to triglycerides at 2 h (p < 0.01), large VLDL concentration at 3 h (p < 0.05), the apoCI plasma and TRL concentrations at 6 h (p < 0.05, p < 0.05), and the apoCI content of TRLs at 6 h (p < 0.002). Multivariate analysis revealed that the apoCI content of TRLs at 6 h (p < 0.0001), plasma triglyceride concentrations at 2 h (p < 0.006), and fasting plasma cholesterol concentration (p < 0.05) independently predicted IMT. In addition, the apoCI content of postprandial TRLs correlated strongly with the cholesterol content (r = 0.64, p < 0.0001). CONCLUSIONS Our results indicate that the apoCI content of postprandial TRLs is a novel independent risk factor for early atherosclerosis in normolipidemic healthy middle-aged men with possible implication for the enrichment of TRL remnant lipoproteins with cholesterol.
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Affiliation(s)
- Anders Hamsten
- Atherosclerosis Research Unit, King Gustaf V Research Institute, Karolinska Institutet, Karolinska Hospital, 171-76 Stockholm, Sweden
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19
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Shachter NS, Rabinowitz D, Stohl S, Conde-Knape K, Cohn JS, Deckelbaum RJ, Berglund L, Shea S. The common insertional polymorphism in the APOC1 promoter is associated with serum apolipoprotein C-I levels in Hispanic children. Atherosclerosis 2005; 179:387-93. [PMID: 15777558 DOI: 10.1016/j.atherosclerosis.2004.10.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2004] [Revised: 09/27/2004] [Accepted: 10/14/2004] [Indexed: 11/24/2022]
Abstract
We examined the effect of APOC1-317insCGTT allele status (HpaI RFLP, deletion [H1] and insertion [H2] alleles) on serum apolipoprotein (apo) C-I level in 362 Hispanic children in the Columbia University BioMarkers Study. The H2 allele was present in 147 subjects (40.6%). Serum apoC-I was 20% lower in the presence of the H2 allele in APOE epsilon3/epsilon3 homozygotes (P=0.003) but did not differ by H2 status in epsilon4 carriers. Insufficient numbers of epsilon2 carriers (N=45) were present for analysis. In multivariate analysis in the epsilon3/epsilon3 context, after adjusting for potential covariate effects and familial aggregation, the mean effect of H2/* versus H1/H1 on apoC-I level, was estimated to be 2.15+/-0.55mg/dl (P<0.0025). Plasma triglyceride level was weakly correlated with serum apoC-I level (Pearson's r=0.17, P<0.001) but was highly correlated with serum apoC-III (Pearson's r=0.74, P<0.0001). Nevertheless, presence of the H2 allele was not significantly associated with serum apoC-III level. Thus, the effect of APOC1 genotype on serum apoC-I level was not due to apoC-I level serving as a surrogate for triglyceride level. The APOC1-317insCGTT allele is a commonly polymorphic genetic marker that is associated with serum apoC-I level in the APOE epsilon3/epsilon3 context. These findings suggest that the mechanism of the previously described association with plasma TG is, at least in part, related to the correlation of the polymorphism with the level of expression of apoC-I.
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Affiliation(s)
- Neil S Shachter
- Department of Medicine, Columbia University, 630 West 168th Street, New York, NY 10032, USA.
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20
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Hopkins PN, Wu LL, Hunt SC, Brinton EA. Plasma triglycerides and type III hyperlipidemia are independently associated with premature familial coronary artery disease. J Am Coll Cardiol 2005; 45:1003-12. [PMID: 15808755 DOI: 10.1016/j.jacc.2004.11.062] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2004] [Revised: 11/22/2004] [Accepted: 11/29/2004] [Indexed: 12/15/2022]
Abstract
OBJECTIVES This study was designed to explore contributions of plasma total triglycerides (TGs) and type III hyperlipidemia to the risk of premature familial coronary artery disease (CAD). BACKGROUND Although plasma TGs are recognized as a risk factor for CAD, the independence of this association from related risk factors remains controversial. Also, the degree of CAD risk conferred by excess remnants of TG-rich lipoproteins in type III hyperlipidemia remains unclear. METHODS We analyzed lipids by ultracentrifugation in a series of 653 cases with premature familial CAD (myocardial infarction or revascularization by age 55 years in men or age 65 years in women, with similar onset in at least one other first-degree relative) and in 1,029 control subjects. The relationship of CAD risk to various strata of plasma TGs, high-density lipoprotein (HDL) cholesterol, and type III hyperlipidemia, and interactions among these variables were examined by multiple logistic regression, adjusting for other CAD risk factors. RESULTS The odds ratio for CAD with elevated plasma TG rose progressively to 11.4 in those with TGs 500 to 799 mg/dl (95% confidence interval 3.4 to 38.0, p < 0.0001) compared with <100 mg/dl, even after correction for HDL cholesterol, other elements of the metabolic syndrome, and other CAD risk factors. Risk of CAD associated with type III hyperlipidemia (found in 3.4% of cases) was also markedly increased independent of other risk factors (odds ratios of 5 to 10 depending on the model, all with p < 0.002). CONCLUSIONS The association between the plasma TG level and premature familial CAD is strong, graded, and independent. Risk of CAD is also strikingly elevated with type III hyperlipidemia.
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Affiliation(s)
- Paul N Hopkins
- Cardiovascular Genetics, Department of Internal Medicine, Cardiology Division, University of Utah School of Medicine, 410 Chipeta Way, Salt Lake City, UT 84108, USA.
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Castro Cabezas M, Verseyden C, Meijssen S, Jansen H, Erkelens DW. Effects of atorvastatin on the clearance of triglyceride-rich lipoproteins in familial combined hyperlipidemia. J Clin Endocrinol Metab 2004; 89:5972-80. [PMID: 15579746 DOI: 10.1210/jc.2003-031329] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Familial combined hyperlipidemia (FCHL) patients have an impaired catabolism of postprandial triglyceride (TG)-rich lipoproteins (TRLs). We investigated whether atorvastatin corrects the delayed clearance of large TRLs in FCHL by evaluating the acute clearance of Intralipid (10%) and TRLs after oral fat-loading tests. Sixteen matched controls were included. Atorvastatin reduced fasting plasma TG (from 3.6 +/- 0.4 to 2.5 +/- 0.3 mM; mean +/- SEM) without major effects on fasting apolipoprotein B48 (apoB48) and apoB100 in large TRLs. Atorvastatin significantly reduced fasting intermediate density lipoprotein (Svedberg flotation, 12-20)-apoB100 concentrations. After Intralipid, TG in plasma and TRL showed similar kinetics in FCHL before and after atorvastatin treatment, although compared with controls, the clearance of large TRLs was only significantly slower in untreated FCHL, suggesting an improvement by atorvastatin. Investigated with oral fat-loading tests, the clearance of very low density lipoprotein (Sf20-60)-apoB100 improved by 24%, without major changes in the other fractions. The most striking effects of atorvastatin on postprandial lipemia in FCHL were on hepatic TRL, without major improvements on intestinal TRLs. Fasting plasma TG should be reduced more aggressively in FCHL to overcome the lipolytic disturbance causing delayed clearance of postprandial TRLs.
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Affiliation(s)
- M Castro Cabezas
- Department of Internal Medicine, St. Franciscus Gasthuis Rotterdam, 3004 BA Rotterdam, The Netherlands.
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22
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Williams CM, Maitin V, Jackson KG. Triacylglycerol-rich lipoprotein–gene interactions in endothelial cells. Biochem Soc Trans 2004; 32:994-8. [PMID: 15506945 DOI: 10.1042/bst0320994] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Lipoproteins such as LDL (low-density lipoprotein) and oxidized LDL have potentially adverse effects on endothelial cells due to their ability to activate pro-inflammatory pathways regulated via the transcription factor NF-κB (nuclear factor κB). Triacylglycerol-rich lipoproteins (the chylomicrons, very-low-density lipoprotein and their respective remnant particles) have also been implicated in the induction of a pro-inflammatory phenotype and up-regulation of adhesion molecule expression. Although early studies supported the proposal that LPL (lipoprotein lipase)-mediated hydrolysis of TRLs (triglyceride-rich lipoproteins) at the endothelium could activate the NFκB pathway, more recent studies provide evidence of pro- and anti-inflammatory responses when cells are exposed to fatty acids or TRL particles. A large number of genes are up- and down-regulated when cells are exposed to TRL, with the net effect reflecting receptor- and nonreceptor-mediated pathways that are activated or inhibited depending on fatty acid type, the lipid and apolipoprotein composition of the TRL and the presence or absence of LPL. Early concepts of TRL particles as essentially pro-inflammatory stimuli to the endothelium provide an overly simplistic view of their impact on the vascular compartment.
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Affiliation(s)
- C M Williams
- Hugh Sinclair Unit of Human Nutrition, School of Food Biosciences, University of Reading, Reading RG6 6AP, UK.
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Oi K, Shimokawa H, Hiroki J, Uwatoku T, Abe K, Matsumoto Y, Nakajima Y, Nakajima K, Takeichi S, Takeshita A. Remnant Lipoproteins from Patients with Sudden Cardiac Death Enhance Coronary Vasospastic Activity Through Upregulation of Rho-Kinase. Arterioscler Thromb Vasc Biol 2004; 24:918-22. [PMID: 15044207 DOI: 10.1161/01.atv.0000126678.93747.80] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Sudden cardiac death (SCD) still remains a serious problem. We have previously shown that remnant-like particles (RLP) are the major risk factor for SCD and that Rho-kinase plays a central role in the molecular mechanism of coronary vasospasm. In this study, we examined whether RLP from patients with SCD upregulate Rho-kinase associated with an enhanced coronary vasospastic activity. METHODS AND RESULTS We isolated RLP and non-RLP in very-low-density lipoprotein (VLDL) fraction from SCD patients without coronary stenosis. We performed in vivo study in which we treated the coronary artery with RLP or non-RLP fraction at the adventitia in pigs. After 1 week, intracoronary serotonin caused marked coronary hyperconstriction at the segment treated with RLP fraction but not with non-RLP fraction (P<0.001, n=6), and hydroxyfasudil, a selective Rho-kinase inhibitor, dose-dependently inhibited the spasm in vivo. In organ chamber experiments, serotonin caused hypercontraction of vascular smooth muscle cells (VSMC) from RLP-treated segment, which was significantly inhibited by hydroxyfasudil (P<0.001, n=6). In cultured human coronary VSMC, the treatment with RLP significantly enhanced the expression and activity of Rho-kinase (P<0.05, n=6). CONCLUSIONS These results indicate that RLP from SCD patients upregulate Rho-kinase in coronary VSMC and markedly enhance coronary vasospastic activity.
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Affiliation(s)
- Keiji Oi
- Department of Cardiovascular Medicine, Kyushu University Graduate School of Medical Sciences, Fukuoka, Japan
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Kolmakova A, Kwiterovich P, Virgil D, Alaupovic P, Knight-Gibson C, Martin SF, Chatterjee S. Apolipoprotein C-I induces apoptosis in human aortic smooth muscle cells via recruiting neutral sphingomyelinase. Arterioscler Thromb Vasc Biol 2003; 24:264-9. [PMID: 14670935 DOI: 10.1161/01.atv.0000112036.72200.ac] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Apolipoprotein C-I (apoC-I) influences lipoprotein metabolism, but little is known about its cellular effects in aortic smooth muscle cells (ASMC). METHODS AND RESULTS In cultured human ASMC, apoC-I and immunoaffinity purified apoC-I-enriched high-density lipoproteins (HDL) markedly induced apoptosis (5- to 25-fold), compared with control cells, apoC-I-poor HDL, and apolipoprotein C-III (apoC-III) as determined by 4', 6-diamidino-2-phenylindole dihydrochloride staining and DNA ladder assay. Preincubation of cells with GW4869, an inhibitor of neutral sphingomyelinase (N-SMase), blocked apoC-I-induced apoptosis, an effect that was bypassed by C-2 ceramide. The activity of N-SMase was increased 2- to 3-fold in ASMC by apoC-I, apoC-I-enriched HDL, and tumor necrosis factor alpha (TNF-alpha) (positive control) after 10 minutes and then decreased over 60 minutes, which is a kinetic pattern not seen with controls, apoC-III, and apoC-I-poor HDL. ApoC-I and apoC-I-enriched HDL stimulated the generation of ceramide, the release of cytochrome c from mitochondria, and activation of caspase-3 greater than that found in controls, apoC-III, and apoC-I-poor HDL. GW4869 inhibited apoC-I-induced production of ceramide and cytochrome c release. CONCLUSIONS ApoC-I and apoC-I-enriched HDL activate the N-SMase-ceramide signaling pathway, leading to apoptosis in human ASMC, which is an effect that may promote plaque rupture in vivo.
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Affiliation(s)
- Antonina Kolmakova
- Lipid Research Atherosclerosis Division, Johns Hopkins University, Baltimore, MD, USA
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