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Huybrechts I, Jacobs I, Aglago EK, Yammine S, Matta M, Schmidt JA, Casagrande C, Nicolas G, Biessy C, Van Puyvelde H, Scalbert A, Derksen JWG, van der Schouw YT, Grioni S, Amiano P, Halkjær J, Tjønneland A, Huerta JM, Luján-Barroso L, Palli D, Gunter MJ, Perez-Cornago A, Chajès V. Associations between Fatty Acid Intakes and Plasma Phospholipid Fatty Acid Concentrations in the European Prospective Investigation into Cancer and Nutrition. Nutrients 2023; 15:3695. [PMID: 37686727 PMCID: PMC10489906 DOI: 10.3390/nu15173695] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/04/2023] [Accepted: 08/17/2023] [Indexed: 09/10/2023] Open
Abstract
BACKGROUND The aim of this study is to determine the correlations between dietary fatty acid (FA) intakes and plasma phospholipid (PL) FA levels in the European Prospective Investigation into Cancer and Nutrition (EPIC) cohort. METHODS The dietary intake of 60 individual FAs was estimated using centre-specific validated dietary questionnaires. Plasma PL FA concentrations of these FAs were measured in non-fasting venous plasma samples in nested case-control studies within the EPIC cohort (n = 4923, using only non-cases). Spearman rank correlations were calculated to determine associations between FA intakes and plasma PL FA levels. RESULTS Correlations between FA intakes and circulating levels were low to moderately high (-0.233 and 0.554). Moderate positive correlations were found for total long-chain n-3 poly-unsaturated FA (PUFA) (r = 0.354) with the highest (r = 0.406) for n-3 PUFA docosahexaenoic acid (DHA). Moderate positive correlations were also found for the non-endogenously synthesized trans-FA (r = 0.461 for total trans-FA C16-18; r = 0.479 for industrial trans-FA (elaidic acid)). CONCLUSIONS Our findings indicate that dietary FA intakes might influence the plasma PL FA status to a certain extent for several specific FAs. The stronger positive correlations for health-enhancing long-chain PUFAs and the health-deteriorating trans-FA that are not endogenously produced are valuable for future cancer prevention public health interventions.
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Affiliation(s)
- Inge Huybrechts
- Nutrition and Metabolism Branch, International Agency for Research on Cancer, CEDEX 07, 69366 Lyon, France; (I.J.); (E.K.A.); (S.Y.); (M.M.); (C.C.); (G.N.); (C.B.); (H.V.P.); (A.S.); (M.J.G.); (V.C.)
| | - Inarie Jacobs
- Nutrition and Metabolism Branch, International Agency for Research on Cancer, CEDEX 07, 69366 Lyon, France; (I.J.); (E.K.A.); (S.Y.); (M.M.); (C.C.); (G.N.); (C.B.); (H.V.P.); (A.S.); (M.J.G.); (V.C.)
| | - Elom K. Aglago
- Nutrition and Metabolism Branch, International Agency for Research on Cancer, CEDEX 07, 69366 Lyon, France; (I.J.); (E.K.A.); (S.Y.); (M.M.); (C.C.); (G.N.); (C.B.); (H.V.P.); (A.S.); (M.J.G.); (V.C.)
| | - Sahar Yammine
- Nutrition and Metabolism Branch, International Agency for Research on Cancer, CEDEX 07, 69366 Lyon, France; (I.J.); (E.K.A.); (S.Y.); (M.M.); (C.C.); (G.N.); (C.B.); (H.V.P.); (A.S.); (M.J.G.); (V.C.)
| | - Michèle Matta
- Nutrition and Metabolism Branch, International Agency for Research on Cancer, CEDEX 07, 69366 Lyon, France; (I.J.); (E.K.A.); (S.Y.); (M.M.); (C.C.); (G.N.); (C.B.); (H.V.P.); (A.S.); (M.J.G.); (V.C.)
| | - Julie A. Schmidt
- Cancer Epidemiology Unit, Nuffield Department of Population Health, University of Oxford, Oxford OX3 7LF, UK; (J.A.S.); (A.P.-C.)
- Department of Clinical Epidemiology, Department of Clinical Medicine, Aarhus University Hospital, Aarhus University, 8200 Aarhus, Denmark
| | - Corinne Casagrande
- Nutrition and Metabolism Branch, International Agency for Research on Cancer, CEDEX 07, 69366 Lyon, France; (I.J.); (E.K.A.); (S.Y.); (M.M.); (C.C.); (G.N.); (C.B.); (H.V.P.); (A.S.); (M.J.G.); (V.C.)
| | - Geneviève Nicolas
- Nutrition and Metabolism Branch, International Agency for Research on Cancer, CEDEX 07, 69366 Lyon, France; (I.J.); (E.K.A.); (S.Y.); (M.M.); (C.C.); (G.N.); (C.B.); (H.V.P.); (A.S.); (M.J.G.); (V.C.)
| | - Carine Biessy
- Nutrition and Metabolism Branch, International Agency for Research on Cancer, CEDEX 07, 69366 Lyon, France; (I.J.); (E.K.A.); (S.Y.); (M.M.); (C.C.); (G.N.); (C.B.); (H.V.P.); (A.S.); (M.J.G.); (V.C.)
| | - Heleen Van Puyvelde
- Nutrition and Metabolism Branch, International Agency for Research on Cancer, CEDEX 07, 69366 Lyon, France; (I.J.); (E.K.A.); (S.Y.); (M.M.); (C.C.); (G.N.); (C.B.); (H.V.P.); (A.S.); (M.J.G.); (V.C.)
| | - Augustin Scalbert
- Nutrition and Metabolism Branch, International Agency for Research on Cancer, CEDEX 07, 69366 Lyon, France; (I.J.); (E.K.A.); (S.Y.); (M.M.); (C.C.); (G.N.); (C.B.); (H.V.P.); (A.S.); (M.J.G.); (V.C.)
| | - Jeroen W. G. Derksen
- Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, 3584 EA Utrecht, The Netherlands; (J.W.G.D.); (Y.T.v.d.S.)
| | - Yvonne T. van der Schouw
- Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, 3584 EA Utrecht, The Netherlands; (J.W.G.D.); (Y.T.v.d.S.)
| | - Sara Grioni
- Epidemiology and Prevention Unit, Fondazione IRCCS Istituto Nazionale dei Tumori di Milano, 20133 Milano, Italy;
| | - Pilar Amiano
- Ministry of Health of the Basque Government, Sub Directorate for Public Health and Addictions of Gipuzkoa, 20014 San Sebastian, Spain;
- Epidemiology of Chronic and Communicable Diseases Group, Biodonostia Health Research Institute, 20014 San Sebastián, Spain
- CIBER Epidemiología y Salud Pública (CIBERESP), 28029 Madrid, Spain;
| | - Jytte Halkjær
- Department of Diet, Genes and Environment, Danish Cancer Society Research Center, University of Copenhagen, Strandboulevarden 49, 2100 Copenhagen, Denmark; (J.H.); (A.T.)
| | - Anne Tjønneland
- Department of Diet, Genes and Environment, Danish Cancer Society Research Center, University of Copenhagen, Strandboulevarden 49, 2100 Copenhagen, Denmark; (J.H.); (A.T.)
| | - José M. Huerta
- CIBER Epidemiología y Salud Pública (CIBERESP), 28029 Madrid, Spain;
- Department of Epidemiology, Regional Health Council, IMIB-Arrixaca, 30005 Murcia, Spain
| | - Leila Luján-Barroso
- Unit of Nutrition and Cancer, Cancer Epidemiology Research Program, Catalan Institute of Oncology—IDIBELL, 08908 L’Hospitalet de Llobregat, Spain;
- Nutrition and Cancer Group, Epidemiology, Public Health, Cancer Prevention and Palliative Care Program, Bellvitge Biomedical Research Institute—IDIBELL, L’Hospitalet de Llobregat, Av. Granvia 199-203, 08908 L’Hospitalet de Llobregat, Spain
| | - Domenico Palli
- Cancer Risk Factors and Life-Style Epidemiology Unit, Institute for Cancer Research, Prevention and Clinical Network (ISPRO), 50139 Florence, Italy;
| | - Marc J. Gunter
- Nutrition and Metabolism Branch, International Agency for Research on Cancer, CEDEX 07, 69366 Lyon, France; (I.J.); (E.K.A.); (S.Y.); (M.M.); (C.C.); (G.N.); (C.B.); (H.V.P.); (A.S.); (M.J.G.); (V.C.)
- Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, London W2 1PG, UK
| | - Aurora Perez-Cornago
- Cancer Epidemiology Unit, Nuffield Department of Population Health, University of Oxford, Oxford OX3 7LF, UK; (J.A.S.); (A.P.-C.)
| | - Véronique Chajès
- Nutrition and Metabolism Branch, International Agency for Research on Cancer, CEDEX 07, 69366 Lyon, France; (I.J.); (E.K.A.); (S.Y.); (M.M.); (C.C.); (G.N.); (C.B.); (H.V.P.); (A.S.); (M.J.G.); (V.C.)
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Estévez-Vázquez O, Benedé-Ubieto R, Guo F, Gómez-Santos B, Aspichueta P, Reissing J, Bruns T, Sanz-García C, Sydor S, Bechmann LP, Maranillo E, Sañudo JR, Vázquez MT, Lamas-Paz A, Morán L, Mazariegos MS, Ciudin A, Pericàs JM, Peligros MI, Vaquero J, Martínez-Naves E, Liedtke C, Regueiro JR, Trautwein C, Bañares R, Cubero FJ, Nevzorova YA. Fat: Quality, or Quantity? What Matters Most for the Progression of Metabolic Associated Fatty Liver Disease (MAFLD). Biomedicines 2021; 9:biomedicines9101289. [PMID: 34680405 PMCID: PMC8533605 DOI: 10.3390/biomedicines9101289] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Revised: 09/13/2021] [Accepted: 09/19/2021] [Indexed: 02/06/2023] Open
Abstract
Objectives: Lately, many countries have restricted or even banned transfat, and palm oil has become a preferred replacement for food manufacturers. Whether palm oil is potentially an unhealthy food mainly due to its high content of saturated Palmitic Acid (PA) is a matter of debate. The aim of this study was to test whether qualitative aspects of diet such as levels of PA and the fat source are risk factors for Metabolic Syndrome (MS) and Metabolic Associated Fatty Liver Disease (MAFLD). Methods: C57BL/6 male mice were fed for 14 weeks with three types of Western diet (WD): 1. LP-WD—low concentration of PA (main fat source—corn and soybean oils); 2. HP-WD—high concentration of PA (main fat source—palm oil); 3. HP-Trans-WD—high concentration of PA (mainly transfat). Results: All types of WD caused weight gain, adipocyte enlargement, hepatomegaly, lipid metabolism alterations, and steatohepatitis. Feeding with HP diets led to more prominent obesity, hypercholesterolemia, stronger hepatic injury, and fibrosis. Only the feeding with HP-Trans-WD resulted in glucose intolerance and elevation of serum transaminases. Brief withdrawal of WDs reversed MS and signs of MAFLD. However, mild hepatic inflammation was still detectable in HP groups. Conclusions: HP and HP-Trans-WD play a crucial role in the genesis of MS and MAFLD.
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Affiliation(s)
- Olga Estévez-Vázquez
- Department of Physiology, Genetics and Microbiology, Faculty of Biology, Complutense University of Madrid, 28040 Madrid, Spain; (O.E.-V.); (R.B.-U.)
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (F.G.); (C.S.-G.); (A.L.-P.); (L.M.); (M.S.M.); (E.M.-N.); (J.R.R.); (R.B.); (F.J.C.)
| | - Raquel Benedé-Ubieto
- Department of Physiology, Genetics and Microbiology, Faculty of Biology, Complutense University of Madrid, 28040 Madrid, Spain; (O.E.-V.); (R.B.-U.)
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (F.G.); (C.S.-G.); (A.L.-P.); (L.M.); (M.S.M.); (E.M.-N.); (J.R.R.); (R.B.); (F.J.C.)
| | - Feifei Guo
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (F.G.); (C.S.-G.); (A.L.-P.); (L.M.); (M.S.M.); (E.M.-N.); (J.R.R.); (R.B.); (F.J.C.)
| | - Beatriz Gómez-Santos
- Department of Physiology, Faculty of Medicine and Nursing, University of Basque Country UPV/EHU, 48940 Leioa, Spain; (B.G.-S.); (P.A.)
| | - Patricia Aspichueta
- Department of Physiology, Faculty of Medicine and Nursing, University of Basque Country UPV/EHU, 48940 Leioa, Spain; (B.G.-S.); (P.A.)
- Biocruces Health Research Institute, 48903 Barakaldo, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Instituto de Salud Carlos III, 28220 Madrid, Spain; (J.M.P.); (J.V.)
| | - Johanna Reissing
- Department of Internal Medicine III, University Hospital RWTH Aachen, 52074 Aachen, Germany; (J.R.); (T.B.); (C.L.); (C.T.)
| | - Tony Bruns
- Department of Internal Medicine III, University Hospital RWTH Aachen, 52074 Aachen, Germany; (J.R.); (T.B.); (C.L.); (C.T.)
| | - Carlos Sanz-García
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (F.G.); (C.S.-G.); (A.L.-P.); (L.M.); (M.S.M.); (E.M.-N.); (J.R.R.); (R.B.); (F.J.C.)
| | - Svenja Sydor
- Department of Internal Medicine, University Hospital Knappschaftskrankenhaus, Ruhr-University Bochum, 44801 Bochum, Germany; (S.S.); (L.P.B.)
| | - Lars P. Bechmann
- Department of Internal Medicine, University Hospital Knappschaftskrankenhaus, Ruhr-University Bochum, 44801 Bochum, Germany; (S.S.); (L.P.B.)
| | - Eva Maranillo
- Department of Human Anatomy and Embryology, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (E.M.); (J.R.S.); (M.T.V.)
| | - José Ramón Sañudo
- Department of Human Anatomy and Embryology, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (E.M.); (J.R.S.); (M.T.V.)
| | - María Teresa Vázquez
- Department of Human Anatomy and Embryology, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (E.M.); (J.R.S.); (M.T.V.)
| | - Arantza Lamas-Paz
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (F.G.); (C.S.-G.); (A.L.-P.); (L.M.); (M.S.M.); (E.M.-N.); (J.R.R.); (R.B.); (F.J.C.)
| | - Laura Morán
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (F.G.); (C.S.-G.); (A.L.-P.); (L.M.); (M.S.M.); (E.M.-N.); (J.R.R.); (R.B.); (F.J.C.)
- Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM), 28009 Madrid, Spain
| | - Marina S. Mazariegos
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (F.G.); (C.S.-G.); (A.L.-P.); (L.M.); (M.S.M.); (E.M.-N.); (J.R.R.); (R.B.); (F.J.C.)
| | - Andreea Ciudin
- Endocrinology Department, Vall d’Hebron University Hospital, Vall d’Hebron Institute for Research (VHIR), 08035 Barcelona, Spain;
| | - Juan M. Pericàs
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Instituto de Salud Carlos III, 28220 Madrid, Spain; (J.M.P.); (J.V.)
- Liver Unit, Internal Medicine Department, Vall d’Hebron University Hospital, Vall d’Hebron Institute for Research (VHIR), 08035 Barcelona, Spain
| | - María Isabel Peligros
- Servicio de Anatomía Patológica, Hospital General Universitario Gregorio Marañón, 28007 Madrid, Spain;
| | - Javier Vaquero
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Instituto de Salud Carlos III, 28220 Madrid, Spain; (J.M.P.); (J.V.)
- Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM), 28009 Madrid, Spain
- Servicio de Aparato Digestivo, Hospital General Universitario Gregorio Marañón, 28007 Madrid, Spain
| | - Eduardo Martínez-Naves
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (F.G.); (C.S.-G.); (A.L.-P.); (L.M.); (M.S.M.); (E.M.-N.); (J.R.R.); (R.B.); (F.J.C.)
- 12 de Octubre Health Research Institute (imas12), 28041 Madrid, Spain
| | - Christian Liedtke
- Department of Internal Medicine III, University Hospital RWTH Aachen, 52074 Aachen, Germany; (J.R.); (T.B.); (C.L.); (C.T.)
| | - José R. Regueiro
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (F.G.); (C.S.-G.); (A.L.-P.); (L.M.); (M.S.M.); (E.M.-N.); (J.R.R.); (R.B.); (F.J.C.)
- 12 de Octubre Health Research Institute (imas12), 28041 Madrid, Spain
| | - Christian Trautwein
- Department of Internal Medicine III, University Hospital RWTH Aachen, 52074 Aachen, Germany; (J.R.); (T.B.); (C.L.); (C.T.)
| | - Rafael Bañares
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (F.G.); (C.S.-G.); (A.L.-P.); (L.M.); (M.S.M.); (E.M.-N.); (J.R.R.); (R.B.); (F.J.C.)
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Instituto de Salud Carlos III, 28220 Madrid, Spain; (J.M.P.); (J.V.)
- Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM), 28009 Madrid, Spain
- Servicio de Aparato Digestivo, Hospital General Universitario Gregorio Marañón, 28007 Madrid, Spain
| | - Francisco Javier Cubero
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (F.G.); (C.S.-G.); (A.L.-P.); (L.M.); (M.S.M.); (E.M.-N.); (J.R.R.); (R.B.); (F.J.C.)
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Instituto de Salud Carlos III, 28220 Madrid, Spain; (J.M.P.); (J.V.)
- Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM), 28009 Madrid, Spain
| | - Yulia A. Nevzorova
- Department of Immunology, Ophthalmology and ENT, School of Medicine, Complutense University of Madrid, 28040 Madrid, Spain; (F.G.); (C.S.-G.); (A.L.-P.); (L.M.); (M.S.M.); (E.M.-N.); (J.R.R.); (R.B.); (F.J.C.)
- Centro de Investigación Biomédica en Red de Enfermedades Hepáticas y Digestivas (CIBEREHD), Instituto de Salud Carlos III, 28220 Madrid, Spain; (J.M.P.); (J.V.)
- Department of Internal Medicine III, University Hospital RWTH Aachen, 52074 Aachen, Germany; (J.R.); (T.B.); (C.L.); (C.T.)
- Instituto de Investigación Sanitaria Gregorio Marañón (IiSGM), 28009 Madrid, Spain
- Correspondence: ; Tel.: +49-(0)241-80-80662; Fax: +49-(0)241-80-82455
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Michels N, Specht IO, Heitmann BL, Chajès V, Huybrechts I. Dietary trans-fatty acid intake in relation to cancer risk: a systematic review and meta-analysis. Nutr Rev 2021; 79:758-776. [PMID: 34104953 DOI: 10.1093/nutrit/nuaa061] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
CONTEXT Apart from ruminant fat, trans-fatty acids are produced during the partial hydrogenation of vegetable oils, (eg, in the production of ultraprocessed foods). Harmful cardiovascular effects of trans-fatty acids are already proven, but the link with cancer risk has not yet been summarized. OBJECTIVE A systematic review (following PRISMA guidelines) - including observational studies on the association of trans-fatty acid intake with any cancer risk - was conducted, with no limitations on population types. DATA SOURCES The electronic databases PubMed and Embase were searched to identify relevant studies. DATA EXTRACTION This systematic review included 46 articles. Quality was assessed via the Newcastle-Ottawa scale. Meta-analyses were conducted if at least 4 articles exploring the same transfat-cancer pairings were found. DATA ANALYSIS Nineteen cancer types have been researched in cohort and case-control studies on trans-fatty acids, with breast cancer (n = 17), prostate cancer (n = 11), and colorectal cancer (n = 9) as the most researched. The meta-analyses on total trans-fat showed a significant positive association for prostate cancer (odds ratio [OR] 1.49; 95%CI, 1.13-1.95) and colorectal cancer (OR 1.26; 95%CI, 1.08-1.46) but not for breast cancer (OR 1.12; 95%CI, 0.99-1.26), ovarian cancer (OR 1.10; 95%CI, 0.94-1.28), or non-Hodgkin lymphoma (OR 1.32; 95%CI, 0.99-1.76). Results were dependent on the fatty acid subtype, with even cancer-protective associations for some partially hydrogenated vegetable oils. Enhancing moderators in the positive transfat-cancer relation were gender (direction was cancer-site specific), European ancestry, menopause, older age, and overweight. CONCLUSION Despite heterogeneity, higher risk of prostate and colorectal cancer by high consumption of trans-fatty acids was found. Future studies need methodological improvements (eg, using long-term follow-up cancer data and intake biomarkers). Owing to the lack of studies testing trans-fatty acid subtypes in standardized ways, it is not clear which subtypes (eg, ruminant sources) are more carcinogenic. SYSTEMATIC REVIEW REGISTRATION PROSPERO registration no. CRD42018105899.
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Affiliation(s)
- Nathalie Michels
- Department of Public Health and Primary Care, Ghent University, Ghent, Belgium
| | - Ina Olmer Specht
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Berit L Heitmann
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Veronique Chajès
- International Agency for Research on Cancer, Nutrition and Metabolism Section, Lyon, France
| | - Inge Huybrechts
- Department of Public Health and Primary Care, Ghent University, Ghent, Belgium
- International Agency for Research on Cancer, Nutrition and Metabolism Section, Lyon, France
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Montakhab-Yeganeh H, Babaahmadi-Rezaei H, Doosti M. Effect of elaidic acid on ABCA1 expression in raw 264.7 cells. Is it through PPAR-gamma? EXCLI JOURNAL 2018; 17:864-870. [PMID: 30233285 PMCID: PMC6141816 DOI: 10.17179/excli2018-1605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 08/22/2018] [Indexed: 11/10/2022]
Abstract
In recent years, Trans Fatty Acids have shown a strong correlation with cardiovascular disease. However, the mechanisms explaining their atherogenicity are still unclear. ABCA1, which is involved in the reverse cholesterol transport pathway, has been considered as a new therapeutic target for cardiovascular disease. In vitro studies of the effects of PPAR-γ on lipid homeostasis in macrophage cells suggested a role for PPAR-γ in the regulation of ABCA1-dependent cholesterol efflux to apoA-I pathway. Thus, in this study we examined the effect of elaidic acid (EA) as the most abundant TFA on expression of ABCA1 and PPAR-γ in RAW 264.7 mouse macrophage cell line. Accordingly, after determining appropriate concentrations of EA using MTT, RAW 264.7 cells were treated with different concentrations of EA, and at the end, gene expression was assayed by Real-Time PCR. Our results shown that the expression of ABCA1 decreased in the treated group in comparison with the control group by 1.7, 2.3, and 5.1 fold, after 12 h treatment for 0.5, 1, and 2 mM EA concentration respectively. In addition, after 24 h treatment with EA, the rate of decreasing ABCA1 expression was 2.1, 2.6, 5.7 fold, respectively (P < 0.01). However, EA had no significant effect on PPAR-γ mRNA expression. Therefore, it could be concluded that the atherogenic effect of EA may be mediated by reducing ABCA1 expression in RAW 264.7 cells; however, this reduction has not mediated through altering PPAR-γ expression.
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Affiliation(s)
| | | | - Mahmood Doosti
- Tehran University of Medical Sciences, Department of Clinical Biochemistry, Tehran, Iran
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Mazidi M, Cicero AF, Kengne AP, Banach M. Association Between Plasma Trans-Fatty Acid Concentrations and Measures of Glucose Homeostasis and Cardiovascular Risk Factors in Adults in NHANES 1999-2000. Angiology 2017; 69:630-637. [PMID: 29241351 DOI: 10.1177/0003319717745987] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
There is limited evidence on the association between plasma trans-fatty acids (TFAs) and cardiometabolic risk factors. Therefore, we examined the association between plasma TFA concentrations and glucose homeostasis and cardiovascular (CV) risk factors in adult Americans from the 1999 to 2000 National Health and Nutrition Examination Survey participants. Derivatized TFAs were separated by capillary gas chromatography. Of the 1678 participants, 46.5% were men. The mean age was 50.5 years overall, with no significant difference between men and women ( P = .101). In age-, sex- and race-adjusted analyses, mean waist circumference, fat-free mass, fat mass, C-peptide, insulin, hemoglobin A1c (HbA1c), homeostatic model assessment of insulin resistance (HOMA-IR), serum triglycerides (TGs), and total cholesterol (TC) increased across increasing quarters of TFAs (for all P < .001), while mean serum high-density lipoprotein cholesterol decreased across increasing quarters of plasma TFAs ( P < .001). In multivariable adjusted linear regressions, there remained significant positive associations between all plasma TFAs and body mass index, waist circumference, fat-free mass, fat mass, C-peptide, insulin, fasting blood glucose, HOMA-IR, HbA1c, TGs, low-density lipoprotein cholesterol, and TC ( P < .001). In conclusion, our findings support a possible association between plasma TFAs concentrations and measures of glucose homeostasis and several CV risk factors.
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Affiliation(s)
- Mohsen Mazidi
- 1 Key State Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, China.,2 Institute of Genetics and Developmental Biology, International College, University of Chinese Academy of Science, Beijing, China
| | - Arrigo F Cicero
- 3 Diseases Research Center, Medicine & Surgery Department, Alma Mater Studiorum Atherosclerosis and Metabolic University of Bologna, Bologna, Italy
| | - Andre Pascal Kengne
- 4 Non-Communicable Disease Research Unit, South African Medical Research Council and University of Cape Town, Cape Town, South Africa
| | - Maciej Banach
- 5 Department of Hypertension, Chair of Nephrology and Hypertension, Medical University of Lodz, Lodz, Poland.,6 Polish Mother's Memorial Hospital Research Institute, Lodz, Poland.,7 Cardiovascular Research Centre, University of Zielona Gora, Zielona-Gora, Poland
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6
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Takeuchi H, Sugano M. Industrial Trans Fatty Acid and Serum Cholesterol: The Allowable Dietary Level. J Lipids 2017; 2017:9751756. [PMID: 28951788 PMCID: PMC5603143 DOI: 10.1155/2017/9751756] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Revised: 06/12/2017] [Accepted: 07/25/2017] [Indexed: 01/03/2023] Open
Abstract
Trans fatty acid (TFA) from partially hydrogenated oil is regarded as the worst dietary fatty acid per gram due to its role in coronary heart disease. TFA consumption is decreasing worldwide, but some but not all observational studies indicate that TFA intake has little relevance to serum cholesterol levels in populations with low TFA intake (<1% E [percentage of total energy intake],
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Affiliation(s)
- Hiroyuki Takeuchi
- Department of Food and Nutrition, Toyama College, 444 Mizuguchi, Gankai-ji, Toyama 930-0193, Japan
| | - Michihiro Sugano
- Kyushu University, 5-38-23 Najima, Higashi-ku, Fukuoka 813-0043, Japan
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7
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Manchekar M, Kapil R, Sun Z, Segrest JP, Dashti N. Relationship between Amphipathic β Structures in the β 1 Domain of Apolipoprotein B and the Properties of the Secreted Lipoprotein Particles in McA-RH7777 Cells. Biochemistry 2017; 56:4084-4094. [PMID: 28702990 DOI: 10.1021/acs.biochem.6b01174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Our previous studies demonstrated that the first 1000 amino acid residues (the βα1 domain) of human apolipoprotein (apo) B-100, termed apoB:1000, are required for the initiation of lipoprotein assembly and the formation of a monodisperse stable phospholipid (PL)-rich particle. The objectives of this study were (a) to assess the effects on the properties of apoB truncates undergoing sequential inclusion of the amphipathic β strands in the 700 N-terminal residues of the β1 domain of apoB-100 and (b) to identify the subdomain in the β1 domain that is required for the formation of a microsomal triglyceride transfer protein (MTP)-dependent triacylglycerol (TAG)-rich apoB-containing particle. Characterization of particles secreted by stable transformants of McA-RH7777 cells demonstrated the following. (1) The presence of amphipathic β strands in the 200 N-terminal residues of the β1 domain resulted in the secretion of apoB truncates (apoB:1050 to apoB:1200) as both lipidated and lipid-poor particles. (2) Inclusion of residues 300-700 of the β1 domain led to the secretion of apoB:1300, apoB:1400, apoB:1500, and apoB:1700 predominantly as lipidated particles. (3) Particles containing residues 1050-1500 were all rich in PL. (4) There was a marked increase in the lipid loading capacity and TAG content of apoB:1700-containing particles. (5) Only the level of secretion of apoB:1700 was markedly diminished by MTP inhibitor BMS-197636. These results suggest that apoB:1700 marks the threshold for the formation of a TAG-rich particle and support the concept that MTP participates in apoB assembly and secretion at the stage where particles undergo a transition from PL-rich to TAG-rich.
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Affiliation(s)
| | | | | | - Jere P Segrest
- Division of Cardiovascular Medicine, Department of Medicine, Vanderbilt University Medical Center , Nashville, Tennessee 37232, United States
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8
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The effects of trans-fatty acids on TAG regulation in mice depend on dietary unsaturated fatty acids. Br J Nutr 2017; 116:611-20. [PMID: 27464460 DOI: 10.1017/s0007114516002415] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The aim of this study was to investigate the effects of trans-fatty acids (TFA) on liver and serum TAG regulation in mice fed diets containing different proportions of n-3, n-6 and n-9 unsaturated fatty acids (UFA) from olive (O), maize (C) or rapeseed (R) oils partially substituted or not with TFA (Ot, Ct and Rt, respectively). Male CF1 mice were fed (30 d) one of these diets. The effects of the partial substitution (1 %, w/w) of different UFA with TFA on the activity and expression of hepatic enzymes involved in lipogenesis and fatty acids oxidation were evaluated, as well as their transcription factor expressions. Some of the mechanisms involved in the serum TAG regulation, hepatic VLDL rich in TAG (VLDL-TAG) secretion rate and lipoprotein lipase (LPL) activity were assessed. In liver, TFA induced an increase in TAG content in the Ot and Rt groups, and this effect was associated with an imbalance between lipogenesis and β-oxidation. In the Ot group, exacerbated lipogenesis may be one of the mechanisms responsible for the liver steatosis induced by TFA, whereas in Rt it has been related to a decreased β-oxidation, compared with their respective controls. The enhanced hepatic VLDL-TAG secretion in the Ot and Rt groups was compensated with a differential removal of TAG by LPL enzyme in extrahepatic tissues, leading to unchanged serum TAG levels. In brief, the effects of low levels of TFA on liver and serum TAG regulation in mice depend on the dietary proportions of n-3, n-6 and n-9 UFA.
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9
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Mode-of-action evaluation for the effect of trans fatty acids on low-density lipoprotein cholesterol. Food Chem Toxicol 2016; 98:282-294. [DOI: 10.1016/j.fct.2016.05.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Revised: 05/06/2016] [Accepted: 05/26/2016] [Indexed: 01/06/2023]
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10
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Lipids and Fatty Acid Profiling of Major IndianGarciniaFruit: A Comparative Study and its Nutritional Impact. J AM OIL CHEM SOC 2016. [DOI: 10.1007/s11746-016-2825-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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11
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Sun Y, Neelakantan N, Wu Y, Lote-Oke R, Pan A, van Dam RM. Palm Oil Consumption Increases LDL Cholesterol Compared with Vegetable Oils Low in Saturated Fat in a Meta-Analysis of Clinical Trials. J Nutr 2015; 145:1549-58. [PMID: 25995283 DOI: 10.3945/jn.115.210575] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Accepted: 04/28/2015] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND Palm oil contains a high amount of saturated fat compared with most other vegetable oils, but studies have reported inconsistent effects of palm oil on blood lipids. OBJECTIVE We systematically reviewed the effect of palm oil consumption on blood lipids compared with other cooking oils using data from clinical trials. METHODS We searched PubMed and the Cochrane Library for trials of at least 2 wk duration that compared the effects of palm oil consumption with any of the predefined comparison oils: vegetable oils low in saturated fat, trans fat-containing partially hydrogenated vegetable oils, and animal fats. Data were pooled by using random-effects meta-analysis. RESULTS Palm oil significantly increased LDL cholesterol by 0.24 mmol/L (95% CI: 0.13, 0.35 mmol/L; I(2) = 83.2%) compared with vegetable oils low in saturated fat. This effect was observed in randomized trials (0.31 mmol/L; 95% CI: 0.20, 0.42 mmol/L) but not in nonrandomized trials (0.03 mmol/L; 95% CI: -0.15, 0.20 mmol/L; P-difference = 0.02). Among randomized trials, only modest heterogeneity in study results remained after considering the test oil dose and the comparison oil type (I(2) = 27.5%). Palm oil increased HDL cholesterol by 0.02 mmol/L (95% CI: 0.01, 0.04 mmol/L; I(2) = 49.8%) compared with vegetable oils low in saturated fat and by 0.09 mmol/L (95% CI: 0.06, 0.11 mmol/L; I(2) = 47.8%) compared with trans fat-containing oils. CONCLUSIONS Palm oil consumption results in higher LDL cholesterol than do vegetable oils low in saturated fat and higher HDL cholesterol than do trans fat-containing oils in humans. The effects of palm oil on blood lipids are as expected on the basis of its high saturated fat content, which supports the reduction in palm oil use by replacement with vegetable oils low in saturated and trans fat. This systematic review was registered with the PROSPERO registry at http://www.crd.york.ac.uk/PROSPERO/display_record.asp?ID=CRD42012002601#.VU3wvSGeDRZ as CRD42012002601.
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Affiliation(s)
- Ye Sun
- Saw Swee Hock School of Public Health and NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore
| | | | - Yi Wu
- Saw Swee Hock School of Public Health and
| | | | - An Pan
- Saw Swee Hock School of Public Health and
| | - Rob M van Dam
- Saw Swee Hock School of Public Health and Department of Medicine, Yong Loo Lin School of Medicine, National University of Singapore and National University Health System, Singapore; Department of Nutrition, Harvard School of Public Health, Boston, MA; and NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore
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12
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Ganguly R, Pierce GN. The toxicity of dietary trans fats. Food Chem Toxicol 2015; 78:170-6. [DOI: 10.1016/j.fct.2015.02.004] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 01/27/2015] [Accepted: 02/01/2015] [Indexed: 02/02/2023]
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13
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Differential regulation of ABCA1 and macrophage cholesterol efflux by elaidic and oleic acids. Lipids 2013; 48:757-67. [PMID: 23800855 DOI: 10.1007/s11745-013-3808-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Accepted: 06/04/2013] [Indexed: 12/11/2022]
Abstract
Trans fatty acid consumption is associated with an increased risk of coronary heart disease. This increased risk has been attributed to decreased levels of HDL cholesterol and increased levels of LDL cholesterol. However, the mechanism by which trans fatty acid modulates cholesterol transit remains poorly defined. ATP-binding cassette transporter A1 (ABCA1)-mediated macrophage cholesterol efflux is the rate-limiting step initiating apolipoprotein A-I lipidation. In this study, elaidic acid, the most abundant trans fatty acid in partially hydrogenated vegetable oil, was shown to stabilize macrophage ABCA1 protein levels in comparison to that of its cis fatty acid isomer, oleic acid. The mechanism responsible for the disparate effects of oleic and elaidic acid on ABCA1 levels was through accelerated ABCA1 protein degradation in cells treated with oleic acid. In contrast, no apparent differences were observed in ABCA1 mRNA levels, and only minor changes were observed in Liver X receptor/Retinoic X receptor promoter activity in cells treated with elaidic and oleic acid. Efflux of both tracers and cholesterol mass revealed that elaidic acid slightly increased ABCA1-mediated cholesterol efflux, while oleic acid led to decreased ABCA1-mediated efflux. In conclusion, these studies show that cis and trans structural differences in 18 carbon n-9 monoenoic fatty acids variably impact cholesterol efflux through disparate effects on ABCA1 protein degradation.
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14
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Saín J, González MA, Lasa A, Scalerandi MV, Bernal CA, Portillo MP. Effects of trans-fatty acids on liver lipid metabolism in mice fed on diets showing different fatty acid composition. ANNALS OF NUTRITION AND METABOLISM 2013; 62:242-9. [PMID: 23594856 DOI: 10.1159/000339453] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2011] [Accepted: 05/14/2012] [Indexed: 12/13/2022]
Abstract
AIM Our aim was to investigate the effects of trans-fatty acids (TFA) on liver lipid metabolism in mice fed on experimental diets rich in either oleic or linoleic acid. METHODS Twenty-two male CF1 mice (22.0 ± 0.1 g) were fed with diets rich in corn oil or olive oil, supplemented or not with TFA (0.75 g TFA/100 g diet), for 4 weeks. Changes in triacylglycerol content, the activity and expression of enzymes involved in lipogenesis and fatty acid oxidation were measured. RESULTS Supplementation of an olive oil-rich diet with TFA increased liver triacylglycerols, the activity and expression of lipogenic enzymes and sterol regulatory element-binding protein SREBP-1a expression. By contrast, when TFA were added to a corn oil-rich diet, they did not modify these parameters. No significant differences were observed among the experimental groups in the activity and expression of carnitine palmitoyltransferase-Ia, body and liver weights or serum triacylglycerol concentrations. CONCLUSIONS The effect of TFA on liver fat accumulation depends on the dietary fatty acid composition. Steatosis induced by TFA when included in an olive oil diet (but not in a corn oil diet) was associated with an increased lipogenesis but not with a decreased fatty acid oxidation in animals fed on the olive oil diet. This metabolic change is mediated by SREBP-1a but not by SREBP-1c, and seems to be independent of insulin.
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Affiliation(s)
- Juliana Saín
- Cátedra de Bromatología y Nutrición, Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral, Santa Fe, Argentina
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15
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Abstract
Coronary heart disease is becoming a worldwide epidemic and diet and lifestyle are well known contributing factors. Identifying the kinds of foods that may have a cardioprotective or cardiotoxic effect and understanding their molecular mechanisms of action has become of increasing importance. Through largely epidemiological evidence, trans fatty acid (TFA) intake has been associated with a variety of cardiovascular complications including atherosclerosis. Traditionally, industrial TFAs (iTFAs) have been associated with these deleterious cardiovascular effects. However, there is a current body of research that suggests that ruminant trans fats (rTFAs) may have a cardioprotective role within the heart. The molecular mechanisms whereby TFAs are delivering their effects are largely unknown. In the following review, we discuss recent in vitro, animal and epidemiological research to better understand the effect of TFAs in the diet on cardiovascular disease, particularly atherosclerosis.
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Affiliation(s)
- Riya Ganguly
- Institute of Cardiovascular Sciences, St. Boniface Hospital Research Centre, Winnipeg, Manitoba, Canada
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17
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Dhibi M, Brahmi F, Mnari A, Houas Z, Chargui I, Bchir L, Gazzah N, Alsaif MA, Hammami M. The intake of high fat diet with different trans fatty acid levels differentially induces oxidative stress and non alcoholic fatty liver disease (NAFLD) in rats. Nutr Metab (Lond) 2011; 8:65. [PMID: 21943357 PMCID: PMC3192664 DOI: 10.1186/1743-7075-8-65] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Accepted: 09/23/2011] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Trans-fatty acids (TFA) are known as a risk factor for coronary artery diseases, insulin resistance and obesity accompanied by systemic inflammation, the features of metabolic syndrome. Little is known about the effects on the liver induced by lipids and also few studies are focused on the effect of foods rich in TFAs on hepatic functions and oxidative stress. This study investigates whether high-fat diets with different TFA levels induce oxidative stress and liver dysfunction in rats. METHODS Male Wistar rats were divided randomly into four groups (n = 12/group): C receiving standard-chow; Experimental groups that were fed high-fat diet included 20% fresh soybean oil diet (FSO), 20% oxidized soybean oil diet (OSO) and 20% margarine diet (MG). Each group was kept on the treatment for 4 weeks. RESULTS A liver damage was observed in rats fed with high-fat diet via increase of liver lipid peroxidation and decreased hepatic antioxidant enzyme activities (superoxide dismutase, catalase and glutathione peroxidase). The intake of oxidized oil led to higher levels of lipid peroxidation and a lower concentration of plasma antioxidants in comparison to rats fed with FSO. The higher inflammatory response in the liver was induced by MG diet. Liver histopathology from OSO and MG groups showed respectively moderate to severe cytoplasm vacuolation, hypatocyte hypertrophy, hepatocyte ballooning, and necroinflammation. CONCLUSION It seems that a strong relationship exists between the consumption of TFA in the oxidized oils and lipid peroxidation and non alcoholic fatty liver disease (NAFLD). The extent of the peroxidative events in liver was also different depending on the fat source suggesting that feeding margarine with higher TFA levels may represent a direct source of oxidative stress for the organism. The present study provides evidence for a direct effect of TFA on NAFLD.
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Affiliation(s)
- Madiha Dhibi
- Laboratory of Biochemistry, UR: "Human Nutrition and Metabolic Disorder" Faculty of Medicine of Monastir 5019, Tunisia
| | - Faten Brahmi
- Laboratory of Biochemistry, UR: "Human Nutrition and Metabolic Disorder" Faculty of Medicine of Monastir 5019, Tunisia
| | - Amira Mnari
- Laboratory of Biochemistry, UR: "Human Nutrition and Metabolic Disorder" Faculty of Medicine of Monastir 5019, Tunisia
| | - Zohra Houas
- Laboratory of Histology Cytology and Genetics, Faculty of Medicine, Monastir 5019, Tunisia
| | - Issam Chargui
- Laboratory of Histology Cytology and Genetics, Faculty of Medicine, Monastir 5019, Tunisia
| | - Linda Bchir
- Laboratory of Biochemistry, UR: "Human Nutrition and Metabolic Disorder" Faculty of Medicine of Monastir 5019, Tunisia
| | - Noureddine Gazzah
- Laboratory of Biochemistry, UR: "Human Nutrition and Metabolic Disorder" Faculty of Medicine of Monastir 5019, Tunisia
| | - Mohammed A Alsaif
- College of Applied Medical Sciences, VPP Unit, King Saud University, Riyadh, Saudi Arabia
| | - Mohamed Hammami
- Laboratory of Biochemistry, UR: "Human Nutrition and Metabolic Disorder" Faculty of Medicine of Monastir 5019, Tunisia
- College of Applied Medical Sciences, VPP Unit, King Saud University, Riyadh, Saudi Arabia
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18
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Caviglia JM, Gayet C, Ota T, Hernandez-Ono A, Conlon DM, Jiang H, Fisher EA, Ginsberg HN. Different fatty acids inhibit apoB100 secretion by different pathways: unique roles for ER stress, ceramide, and autophagy. J Lipid Res 2011; 52:1636-51. [PMID: 21719579 DOI: 10.1194/jlr.m016931] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Although short-term incubation of hepatocytes with oleic acid (OA) stimulates secretion of apolipoprotein B100 (apoB100), exposure to higher doses of OA for longer periods inhibits secretion in association with induction of endoplasmic reticulum (ER) stress. Palmitic acid (PA) induces ER stress, but its effects on apoB100 secretion are unclear. Docosahexaenoic acid (DHA) inhibits apoB100 secretion, but its effects on ER stress have not been studied. We compared the effects of each of these fatty acids on ER stress and apoB100 secretion in McArdle RH7777 (McA) cells: OA and PA induced ER stress and inhibited apoB100 secretion at higher doses; PA was more potent because it also increased the synthesis of ceramide. DHA did not induce ER stress but was the most potent inhibitor of apoB100 secretion, acting via stimulation of autophagy. These unique effects of each fatty acid were confirmed when they were infused into C57BL6J mice. Our results suggest that when both increased hepatic secretion of VLDL apoB100 and hepatic steatosis coexist, reducing ER stress might alleviate hepatic steatosis but at the expense of increased VLDL secretion. In contrast, increasing autophagy might reduce VLDL secretion without causing steatosis.
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Affiliation(s)
- Jorge Matias Caviglia
- Department of Medicine, Columbia University College of Physicians and Surgeons, New York, NY, USA
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Abstract
The major dietary sources of trans fatty acids (TFAs) in most countries are partially hydrogenated vegetable oils. TFA consumption is a modifiable dietary risk factor for metabolic syndrome, diabetes mellitus, and coronary heart disease. Here, we review the available data on various effects of TFAs, including metabolic and signaling pathways that mediate these effects, affected tissues, and relationships with clinical end points. TFA consumption causes metabolic dysfunction: it adversely affects circulating lipid levels, triggers systemic inflammation, induces endothelial dysfunction, and, according to some studies, increases visceral adiposity, body weight, and insulin resistance. Dietary TFAs influence the function of multiple cell types, including hepatocytes, adipocytes, macrophages and endothelial cells. Among dietary fats and nutrients, TFAs seem to have a unique cardiometabolic imprint that is linked to insulin-resistance and metabolic-syndrome pathways. Consistent with these adverse physiological effects, consumption of even small amounts of TFAs (2% of total energy intake) is consistently associated with a markedly increased incidence of coronary heart disease. Relationships between TFA consumption and diabetes mellitus have been less consistent, possibly owing to differences in study designs. Nevertheless, the documented adverse effects of TFAs underscore their potential to cause harm and the importance of policy measures to minimize consumption of industrially produced TFAs.
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Affiliation(s)
- Renata Micha
- Department of Epidemiology, Harvard School of Public Health, Boston, MA 02115, USA
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20
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Micha R, Mozaffarian D. Trans fatty acids: effects on cardiometabolic health and implications for policy. Prostaglandins Leukot Essent Fatty Acids 2008; 79:147-52. [PMID: 18996687 PMCID: PMC2639783 DOI: 10.1016/j.plefa.2008.09.008] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
In both developed and developing countries, trans fatty acids (TFA) are largely consumed from partially hydrogenated vegetable oils. This article focuses on TFA as a modifiable dietary risk factor for cardiovascular disease, reviewing the evidence for lipid and non-lipid effects; the relations of trans fat intake with clinical endpoints; and current policy and legislative issues. In both observational cohort studies and randomized clinical trials, TFA adversely affect lipid profiles (including raising LDL and triglyceride levels, and reducing HDL levels), systemic inflammation, and endothelial function. More limited but growing evidence suggests that TFA also exacerbate visceral adiposity and insulin resistance. These potent effects of TFA on a multitude of cardiovascular risk factors are consistent with the strong associations seen in prospective cohort studies between TFA consumption and risk of myocardial infarction and coronary heart disease (CHD) death. The documented harmful effects of TFA along with the feasibility of substituting partially hydrogenated vegetable oils with healthy alternatives indicate little reason for continued presence of industrially produced TFA in food preparation and manufacturing or in home cooking fats/oils. A comprehensive strategy to eliminate the use of industrial TFA in both developed and developing countries, including education, food labeling, and policy and legislative initiatives, would likely prevent tens of thousands of CHD events worldwide each year.
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Affiliation(s)
- R Micha
- Department of Epidemiology, Harvard School of Public Health, Boston, MA, USA
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21
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Manchekar M, Richardson PE, Sun Z, Liu Y, Segrest JP, Dashti N. Charged amino acid residues 997-1000 of human apolipoprotein B100 are critical for the initiation of lipoprotein assembly and the formation of a stable lipidated primordial particle in McA-RH7777 cells. J Biol Chem 2008; 283:29251-65. [PMID: 18725409 DOI: 10.1074/jbc.m804912200] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
We previously demonstrated that a portion, or perhaps all, of the residues between 931 and 1000 of apolipoprotein (apo) B100 are required for the initiation of apoB-containing particle assembly. Based on our structural model of the first 1000 residues of apoB (designated as apoB:1000), we hypothesized that this domain folds into a three-sided lipovitellin-like "lipid pocket" via a hairpin-bridge mechanism. We proposed that salt bridges are formed between four tandem charged residues 717-720 in the turn of the hairpin bridge and four tandem complementary residues 997-1000 located at the C-terminal end of the model. To identify the specific motif within residues 931 and 1000 that is critical for apoB particle assembly, apoB:956 and apoB:986 were produced. To test the hairpin-bridge hypothesis, the following mutations were made: 1) residues 997-1000 deletion (apoB:996), 2) residues 717-720 deletion (apoB:1000Delta717-720), and 3) substitution of charged residues 997-1000 with alanines (apoB:996 + 4Ala). Characterization of particles secreted by stable transformants of McA-RH7777 cells demonstrated the following. 1) ApoB:956 did not form stable particles and was secreted as large lipid-rich aggregates. 2) ApoB:986 formed both a lipidated particle that was denser than HDL(3) and large lipid-rich aggregates. 3) Compared with wild-type apoB:1000, apoB:1000Delta717-720 displayed the following: (i) significantly diminished capacity to form intact lipidated particles and (ii) increased propensity to form large lipid-rich aggregates. 4) In striking contrast to wild-type apoB:1000, (i) apoB:996 and apoB:996 + 4Ala were highly susceptible to intracellular degradation, (ii) only a small proportion of the secreted proteins formed stable HDL(3)-like lipoproteins, and (iii) a majority of the secreted proteins formed large lipid-rich aggregates. We conclude that the first 1000 amino acid residues of human apoB100 are required for the initiation of nascent apoB-containing lipoprotein assembly, and residues 717-720 and 997-1000 play key roles in this process, perhaps via a hairpin-bridge mechanism.
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Affiliation(s)
- Medha Manchekar
- Department of Medicine, Basic Sciences Section, Atherosclerosis Research Unit, University of Alabama at Birmingham Medical Center, Birmingham, Alabama 35294, USA
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Srivastava S, Chan C. Application of metabolic flux analysis to identify the mechanisms of free fatty acid toxicity to human hepatoma cell line. Biotechnol Bioeng 2008; 99:399-410. [PMID: 17615559 PMCID: PMC4059351 DOI: 10.1002/bit.21568] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Chronic exposure to elevated levels of free fatty acids (FFAs) has been shown to cause cell death (lipotoxicity), but the underlying mechanisms of lipotoxicity in hepatocytes remain unclear. We have previously shown that the saturated FFAs cause much greater toxicity to human hepatoma cells (HepG2) than the unsaturated ones (Srivastava and Chan, 2007). In this study, metabolic flux analysis (MFA) was applied to identify the metabolic changes associated with the cytotoxicity of saturated FFA. Measurements of the fluxes revealed that the saturated FFA, palmitate, was oxidized to a greater extent than the non-toxic oleate and had comparatively less triglyceride synthesis and reduced cystine uptake. Although fatty acid oxidation had a high positive correlation to the cytotoxicity, inhibitor experiments indicated that the cytotoxicity was not due to the higher fatty acid oxidation. Application of MFA revealed that cells exposed to palmitate also had a consistently reduced flux of glutathione (GSH) synthesis but greater de novo ceramide synthesis. These predictions were experimentally confirmed. In silico sensitivity analyses identified that the GSH synthesis was limited by the uptake of cysteine. Western blot analyses revealed that the levels of the cystine transporter xCT, but not that of the GSH-synthesis enzyme glutamyl-cysteine synthase (GCS), were reduced in the palmitate cultures, suggesting the limitation of cysteine import as the cause of the reduced GSH synthesis. Finally, supplementing with N-acetyl L-cysteine (NAC), a cysteine-provider whose uptake does not depend on xCT levels, reduced the FFA-toxicity significantly. Thus, the metabolic alterations that contributed to the toxicity and suggested treatments to reduce the toxicity were identified, which were experimentally validated.
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Affiliation(s)
- Shireesh Srivastava
- Department of Chemical Engineering and Material Science, Michigan State University, East Lansing, Michigan 48824; telephone: 517-432-4530; fax: 517-432-1105
| | - Christina Chan
- Department of Chemical Engineering and Material Science, Michigan State University, East Lansing, Michigan 48824; telephone: 517-432-4530; fax: 517-432-1105
- Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824
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Dashti N, Manchekar M, Liu Y, Sun Z, Segrest JP. Microsomal triglyceride transfer protein activity is not required for the initiation of apolipoprotein B-containing lipoprotein assembly in McA-RH7777 cells. J Biol Chem 2007; 282:28597-28608. [PMID: 17690102 DOI: 10.1074/jbc.m700229200] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We previously demonstrated that the N-terminal 1000 amino acid residues of human apolipoprotein (apo) B (designated apoB:1000) are competent to fold into a three-sided lipovitellin-like lipid binding cavity to form the apoB "lipid pocket" without a structural requirement for microsomal triglyceride transfer protein (MTP). Our results established that this primordial apoB-containing particle is phospholipid-rich (Manchekar, M., Richardson, P. E., Forte, T. M., Datta, G., Segrest, J. P., and Dashti, N. (2004) J. Biol. Chem. 279, 39757-39766). In this study we have investigated the putative functional role of MTP in the initial lipidation of apoB:1000 in stable transformants of McA-RH7777 cells. Inhibition of MTP lipid transfer activity by 0.1 microm BMS-197636 and 5, 10, and 20 microm of BMS-200150 had no detectable effect on the synthesis, lipidation, and secretion of apoB:1000-containing particles. Under identical experimental conditions, the synthesis, lipidation, and secretion of endogenous apoB100-containing particles in HepG2 and parental untransfected McA-RH7777 cells were inhibited by 86-94%. BMS-200150 at 40 microm nearly abolished the secretion of endogenous apoB100-containing particles in HepG2 and parental McA-RH cells but caused only 15-20% inhibition in the secretion of apoB: 1000-containing particles. This modest decrease was attributable to the nonspecific effect of a high concentration of this compound on hepatic protein synthesis, as reflected in a similar (20-25%) reduction in albumin secretion. Suppression of MTP gene expression in stable transformants of McA-RH7777 cells by micro-interfering RNA led to 60-70% decrease in MTP mRNA and protein levels, but it had no detectable effect on the secretion of apoB:1000. Our results provide a compelling argument that the initial addition of phospholipids to apoB:1000 and initiation of apoB-containing lipoprotein assembly occur independently of MTP lipid transfer activity.
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Affiliation(s)
- Nassrin Dashti
- Department of Medicine, Basic Sciences Section, Atherosclerosis Research Unit, University of Alabama at Birmingham Medical Center, Birmingham, Alabama 35294; Department of Cell Biology, University of Alabama at Birmingham Medical Center, Birmingham, Alabama 35294.
| | - Medha Manchekar
- Department of Medicine, Basic Sciences Section, Atherosclerosis Research Unit, University of Alabama at Birmingham Medical Center, Birmingham, Alabama 35294
| | - Yanwen Liu
- Department of Medicine, Basic Sciences Section, Atherosclerosis Research Unit, University of Alabama at Birmingham Medical Center, Birmingham, Alabama 35294
| | - Zhihuan Sun
- Department of Medicine, Basic Sciences Section, Atherosclerosis Research Unit, University of Alabama at Birmingham Medical Center, Birmingham, Alabama 35294
| | - Jere P Segrest
- Department of Medicine, Basic Sciences Section, Atherosclerosis Research Unit, University of Alabama at Birmingham Medical Center, Birmingham, Alabama 35294; Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham Medical Center, Birmingham, Alabama 35294
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Dashti N, McGwin G, Owsley C, Curcio CA. Plasma apolipoproteins and risk for age related maculopathy. Br J Ophthalmol 2006; 90:1028-33. [PMID: 16723359 PMCID: PMC1857205 DOI: 10.1136/bjo.2006.093856] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
AIM To determine if elevated plasma levels of atherogenic and/or anti-atherogenic lipoproteins are risk factors for developing age related maculopathy (ARM). METHODS In a cross sectional study in a university clinic setting, 129 patients (72 women and 57 men) underwent colour fundus photography, acuity and contrast sensitivity assessment, and electroimmunoassays of plasma apolipoproteins B (apoB) and A-I (apoA-I), the principal proteins of low density and high density lipoproteins, respectively. Maculopathy stage was assigned using the AREDS grading system. RESULTS Levels of apoB in no ARM, mild, intermediate, and advanced ARM groups were 93.3, 91.8, 95.2, and 98.2 mg/dl, respectively. Levels of apoA-I were 147.4, 148.6, 141.0, and 144.9 mg/dl in the same groups. There was no significant association between these measures, typical for age, and maculopathy stage. CONCLUSION Although drusen associated with ARM and ageing contain cholesterol and apoB, like the lipid rich core of an atherosclerotic plaque, the results of this study and our previous work in toto make the prospects of a plasma origin for these lesion constituents increasingly untenable. This conclusion is consistent with an emerging hypothesis that a large lipoprotein of intraocular origin is an important pathway for constituent retinal lipid processing and the biogenesis of drusen.
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Affiliation(s)
- N Dashti
- Department of Medicine, Division of Geriatrics and Gerontology, Atherosclerosis Research Unit, University of Alabama School of Medicine, Birmingham AL 35294-0009, USA
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Mozaffarian D, Katan MB, Ascherio A, Stampfer MJ, Willett WC. Trans fatty acids and cardiovascular disease. N Engl J Med 2006; 354:1601-13. [PMID: 16611951 DOI: 10.1056/nejmra054035] [Citation(s) in RCA: 992] [Impact Index Per Article: 55.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Dariush Mozaffarian
- Channing Laboratory, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, USA.
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Mosley EE, Wright AL, McGuire MK, McGuire MA. trans Fatty acids in milk produced by women in the United States. Am J Clin Nutr 2005; 82:1292-7. [PMID: 16332663 DOI: 10.1093/ajcn/82.6.1292] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND trans Fatty acids (FAs) have been identified as negatively affecting human health. The trans FA composition of human milk fat must be examined to establish its influence on the nutritional quality of milk consumed by infants. OBJECTIVE We sought to ascertain the individual and total trans FA isomers (sum of FAs containing at least one trans double bond) in human milk and to identify relations between individual FAs and milk fat concentration (% by wt). DESIGN The FA composition of milk samples (n = 81) from women living in the southwestern United States was ascertained. The individual 18:1t isomers were separated. Correlations between each FA, total trans FAs, groups of similar FAs, and milk fat concentrations were examined. RESULTS The mean total trans FA concentration was 7.0 +/- 2.3% (range: 2.5-13.8%). The concentration of total 18:1t was 5.1 +/- 2.0% (range: 1.5-11.6%), and Delta10t (range: Delta9-12t) was the most abundant isomer. CONCLUSIONS Milk fat from women living in the United States contains concentrations of trans FAs similar to those in milk from Canadian women but greater than those reported in milk from women in other countries. In decreasing order of concentration, the Delta10t, Delta11t, Delta9t, and Delta12t isomers represented 78.9% of the total 18:1t. These FAs generally originate from partially hydrogenated vegetable oils and ruminant fat in the diet. No relation was found between the concentration of total trans FAs and milk fat concentration.
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Affiliation(s)
- Erin E Mosley
- Department of Animal and Veterinary Science, University of Idaho, Moscow, ID 83844-2330, USA
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Shorten PR, Upreti GC. A mathematical model of fatty acid metabolism and VLDL assembly in human liver. Biochim Biophys Acta Mol Cell Biol Lipids 2005; 1736:94-108. [PMID: 16137923 DOI: 10.1016/j.bbalip.2005.07.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2004] [Revised: 07/22/2005] [Accepted: 07/28/2005] [Indexed: 11/17/2022]
Abstract
The lipid composition of very-low-density lipoprotein (VLDL) in plasma is crucial for human health. A pre-requisite for the alteration of VLDL composition is a co-ordinated understanding of the complex interactions in VLDL assembly. In order to determine the potential effects of changes in substrate availability on VLDL lipid composition, we constructed, parameterized and evaluated a mechanistic mathematical model of the biosynthesis of triglycerides, phospholipids, and cholesterol esters and the assembly of VLDL in human hepatocytes. Using published data on human liver metabolism, the model was also used to provide insight into the complex process of lipid metabolism and to estimate the affinities of different liver enzymes for different fatty acids (FA). For example, we found that Delta6-desaturase is 19 times more selective for C18:3n-3 than C18:2n-6, stearoyl-CoA-desaturase is 2.7 times more selective for C18:0 than C16:0, Delta5-desaturase desaturates C20:4n-3 preferentially over C20:3n-6 and FA elongase preferentially elongates C18:3n-6. The model was also used to predict the plasma free fatty acid (FFA) composition required to generate a prescribed change in plasma lipoprotein FA composition. Furthermore, the model was tested against a published human feeding trial that investigated the effect of changes in dietary FA composition on human plasma lipid FA composition. The model is a useful tool for predicting the effect of changes in plasma FFA composition on plasma lipoprotein lipid FA composition.
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Affiliation(s)
- P R Shorten
- AgResearch, Ruakura Research Centre, Private Bag 3123, Hamilton, New Zealand.
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Dashti N, Datta G, Manchekar M, Chaddha M, Anantharamaiah GM. Model class A and class L peptides increase the production of apoA-I-containing lipoproteins in HepG2 cells. J Lipid Res 2004; 45:1919-28. [PMID: 15292373 DOI: 10.1194/jlr.m400251-jlr200] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Class A peptides inhibit atherosclerosis and protect cells from class L peptide-mediated lysis. Because the cytolytic process is concentration dependent, we hypothesized that at certain concentrations both classes of peptides exert similar effect(s) on cells. To test this hypothesis, we studied the effects of a class L peptide (18L = GIKKFLGSIWKFIKAFVG) and a class A peptide, 18A-Pro-18A (18A = DWLKAFYDKVAEKLKEAF) (37pA), on apolipoprotein and lipoprotein production in HepG2 cells. Secretion of (35)S-labeled apolipoprotein A-I (apoA-I) was stimulated by both 18L (110%) and 37pA (135%) at 10 and 20 nM of peptides, respectively. Both peptides enhanced the secretion of (3)H-labeled phospholipids by 140% and (14)C-labeled HDL-cholesterol (HDL-C) by 35% but had no significant effect on the total cholesterol mass or secretion. These results indicate that class L and class A peptides cause redistribution of cholesterol among lipoproteins in favor of HDL-C. Both peptides remodeled apoA-I-containing particles forming prebeta- as well as alpha-HDL. This study suggests that increased secretion of phospholipids and apoA-I and the formation of prebeta-HDL particles might contribute to the antiatherogenic properties of these peptides.
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Affiliation(s)
- Nassrin Dashti
- Department of Medicine, Biochemistry, and Molecular Genetics, and Atherosclerosis Research Unit, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
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Manchekar M, Richardson PE, Forte TM, Datta G, Segrest JP, Dashti N. Apolipoprotein B-containing lipoprotein particle assembly: lipid capacity of the nascent lipoprotein particle. J Biol Chem 2004; 279:39757-66. [PMID: 15254032 DOI: 10.1074/jbc.m406302200] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We previously proposed that the N-terminal 1000-residue betaalpha(1) domain of apolipoprotein B (apoB) forms a bulk lipid pocket homologous to that of lamprey lipovitellin. In support of this "lipid pocket" hypothesis, we demonstrated that apoB:1000 (residues 1-1000) is secreted by a stable transformant of McA-RH7777 cells as a monodisperse particle with high density lipoprotein 3 (HDL(3)) density. In contrast, apoB:931 (residues 1-931), missing only 69 residues of the sequence homologous to lipovitellin, was secreted as a particle considerably more dense than HDL(3). In the present study we have determined the stoichiometry of the lipid component of the apoB:931 and apoB:1000 particles. The secreted [(3)H]glycerol-labeled apoB:1000 particles, isolated by nondenaturing gradient gel electrophoresis, contained 50 phospholipid (PL) and 11 triacylglycerol (TAG) molecules/particle. In contrast, apoB:931 particles contained only a few molecules of PL and were devoid of TAG. The unlabeled apoB:1000 particles, isolated by immunoaffinity chromatography, contained 56 PL, 8 TAG, and 7 cholesteryl ester molecules/particle. The surface to core lipid ratio of apoB:1000-containing particles was approximately 4:1 and was not affected by oleate supplementation. Although very small amounts of microsomal triglyceride transfer protein (MTP) were associated with apoB:1000 particles, it never approached a 1:1 molar ratio of MTP to apoB. These results support a model in which (i) the first 1000 amino acid residues of apoB are competent to complete the lipid pocket without a structural requirement for MTP; (ii) a portion, or perhaps all, of the amino acid residues between 931 and 1000 of apoB-100 are critical for the formation of a stable, bulk lipid-containing nascent lipoprotein particle, and (iii) the lipid pocket created by the first 1000 residues of apoB-100 is PL-rich, suggesting a small bilayer type organization and has a maximum capacity on the order of 50 molecules of phospholipid.
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Affiliation(s)
- Medha Manchekar
- Department of Medicine, Atherosclerosis Research Unit, University of Alabama at Birmingham Medical Center, Birmingham, Alabama 35294, USA
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Abstract
PURPOSE OF REVIEW A growing body of data suggests that in addition to LDL-cholesterol concentrations, compositional properties of LDL, including size and fatty acid composition, are important in determining the relative degree of atherogenicity. This review examines current research in this field to evaluate which properties of LDL may most directly influence the risk of coronary heart disease. RECENT FINDINGS The presence of small dense LDL has been correlated with an increased risk of coronary heart disease, but this has not been shown to be fully independent of related factors such as elevated plasma triacylglycerol concentrations. An increased susceptibility of small dense LDL to in-vitro oxidation has also been demonstrated, but its importance to coronary heart disease risk has not been established. Other studies have found that the presence of enlarged LDL, modified (oleate enriched) fatty acyl composition of LDL, and higher numbers of LDL particles in plasma also are endpoints associated with an increased risk of coronary heart disease. SUMMARY LDL size may indicate a metabolic condition associated with increased CHD risk as opposed to the direct promotion of atherosclerosis by specific particle types of LDL. In most claims of detrimental effects of small dense LDL, neither LDL particle concentrations nor the fatty acid composition of the particles were established, both factors being important in contributing to the atherogenic potential of LDL. The predisposition to premature coronary heart disease cannot currently be objectively assigned to any one type of LDL particle.
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Affiliation(s)
- Aaron T Lada
- Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157, USA
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