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Vahmani P, Meadus WJ, da Silva ML, Mitchell AD, Mapiye C, Duff P, Rolland DC, Dugan ME. A trans10-18:1 enriched fraction from beef fed a barley grain-based diet induces lipogenic gene expression and reduces viability of HepG2 cells. Biochem Biophys Rep 2016; 7:84-90. [PMID: 28955893 PMCID: PMC5613299 DOI: 10.1016/j.bbrep.2016.05.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2016] [Accepted: 05/26/2016] [Indexed: 12/05/2022] Open
Abstract
Beef fat is a natural source of trans (t) fatty acids, and is typically enriched with either t10-18:1 or t11-18:1. Little is known about the bioactivity of individual t-18:1 isomers, and the present study compared the effects of t9-18:1, cis (c)9-18:1 and trans (t)-18:1 fractions isolated from beef fat enriched with either t10-18:1 (HT10) or t11-18:1 (HT11). All 18:1 isomers resulted in reduced human liver (HepG2) cell viability relative to control. Both c9-18:1 and HT11were the least toxic, t9-18:1had dose response increased toxicity, and HT10 had the greatest toxicity (P<0.05). Incorporation of t18:1 isomers was 1.8-2.5 fold greater in triacylglycerol (TG) than phospholipids (PL), whereas Δ9 desaturation products were selectively incorporated into PL. Culturing HepG2 cells with t9-18:1 and HT10 increased (P<0.05) the Δ9 desaturation index (c9-16:1/16:0) compared to other fatty acid treatments. HT10 and t9-18:1 also increased expression of lipogenic genes (FAS, SCD1, HMGCR and SREBP2) compared to control (P<0.05), whereas c9-18:1 and HT11 did not affect the expression of these genes. Our results suggest effects of HT11 and c9-18:1 were similar to BSA control, whereas HT10 and t-9 18:1 (i.e. the predominant trans fatty acid isomer found in partially hydrogenated vegetable oils) were more cytotoxic and led to greater expression of lipogenic genes.
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Key Words
- ACC, acetyl-CoA carboxylase
- Ag+-SPE, silver ion solid phase extraction
- BSA, bovine serum albumin
- Beef
- Cell culture
- Cytotoxicity
- FAS, fatty acid synthase
- Fatty acid metabolism
- HMGCR, 3-Hydroxy-3-Methylglutaryl-CoA reductase
- HT10, high-t10 fraction
- HT11, high-t11 fraction
- Liver
- MUFA, monounsaturated fatty acids
- PHVO, partially hydrogenated vegetable oils
- PL, phospholipid
- PUFA, polyunsaturated fatty acids
- SCD1, stearoyl-CoA desaturase-1
- SFA, saturated fatty acid
- SREBP1c, sterol regulatory element-binding protein-1c
- SREBP2, sterol regulatory element-binding protein-2
- TG, triacylglycerol
- TLC, thin layer chromatography
- Trans fatty acids
- c,, cis
- t, trans
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Affiliation(s)
- Payam Vahmani
- Lacombe Research and Development Centre, Agriculture and Agri-Food Canada, Lacombe, Alberta, Canada
| | - William J. Meadus
- Lacombe Research and Development Centre, Agriculture and Agri-Food Canada, Lacombe, Alberta, Canada
| | - Maria L.P. da Silva
- Faculty of Veterinary and Agricultural Sciences, São Paulo State University, Jaboticabal, SP, Brazil
| | - Alec D. Mitchell
- Faculty of Science, University of Alberta, Edmonton, Alberta, Canada
| | - Cletos Mapiye
- Department of Animal Sciences, Faculty of AgriSciences, Stellenbosch University, P. Bag X1, Matieland 7602, South Africa
| | - Pascale Duff
- Lacombe Research and Development Centre, Agriculture and Agri-Food Canada, Lacombe, Alberta, Canada
| | - David C. Rolland
- Lacombe Research and Development Centre, Agriculture and Agri-Food Canada, Lacombe, Alberta, Canada
| | - Michael E.R. Dugan
- Lacombe Research and Development Centre, Agriculture and Agri-Food Canada, Lacombe, Alberta, Canada
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Dahlhoff C, Worsch S, Sailer M, Hummel BA, Fiamoncini J, Uebel K, Obeid R, Scherling C, Geisel J, Bader BL, Daniel H. Methyl-donor supplementation in obese mice prevents the progression of NAFLD, activates AMPK and decreases acyl-carnitine levels. Mol Metab 2014; 3:565-80. [PMID: 25061561 PMCID: PMC4099513 DOI: 10.1016/j.molmet.2014.04.010] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 04/25/2014] [Accepted: 04/30/2014] [Indexed: 12/31/2022] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) results from increased hepatic lipid accumulation and steatosis, and is closely linked to liver one-carbon (C1) metabolism. We assessed in C57BL6/N mice whether NAFLD induced by a high-fat (HF) diet over 8 weeks can be reversed by additional 4 weeks of a dietary methyl-donor supplementation (MDS). MDS in the obese mice failed to reverse NAFLD, but prevented the progression of hepatic steatosis associated with major changes in key hepatic C1-metabolites, e.g. S-adenosyl-methionine and S-adenosyl-homocysteine. Increased phosphorylation of AMPK-α together with enhanced β-HAD activity suggested an increased flux through fatty acid oxidation pathways. This was supported by concomitantly decreased hepatic free fatty acid and acyl-carnitines levels. Although HF diet changed the hepatic phospholipid pattern, MDS did not. Our findings suggest that dietary methyl-donors activate AMPK, a key enzyme in fatty acid β-oxidation control, that mediates increased fatty acid utilization and thereby prevents further hepatic lipid accumulation.
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Key Words
- 3-HB, β-hydroxybutyrate
- ACC, acetyl-CoA carboxylase
- AMP-activated protein kinase
- AMPK, AMP-activated protein kinase
- ANT, adenine nucleotide translocase
- Acyl-carnitines
- Bhmt, betaine-homocysteine methyltransferase
- C, control diet
- C1, one-carbon
- CACT, carnitine-acylcarnitine transporter
- CMS, methyl-donor supplemented control diet
- Cbs, cystathionine β-synthase
- Cpt1a, carnitine palmitoyltransferase-1a
- DIO, diet-induced obesity
- Fasn, fatty acid synthase
- GNMT, glycine N-methyltransferase
- Gapdh, glyceraldehyde 3-phosphate dehydrogenase
- HF, high-fat diet
- HFMS, methyl-donor supplemented high-fat diet
- HMW adiponectin, high molecular weight adiponectin
- HSP90, heat shock protein 90
- Hcy, homocysteine
- Hepatic steatosis
- Hprt1, hypoxanthine phosphoribosyltransferase 1
- LDL, low density lipoprotein
- MAT, methionine adenosyltransferase
- MCD, malonyl-CoA decarboxylase
- MDS, methyl-donor supplementation
- MTR, methionine synthase
- NAFLD, non-alcoholic fatty liver disease
- NEFA, non-esterified fatty acids
- Obesity
- One-carbon metabolism
- PC, phosphatidylcholine
- PGC1α, peroxisome proliferator-activated receptor-γ co-activator-1α
- PL, phospholipids
- PPARα, peroxisome proliferator-activated receptor-α
- Pemt, phosphatidylethanolamine methyltransferase
- SAH, S-adenosylhomocysteine
- SAM, S-adenosylmethionine
- SM, sphingomyelin
- SREBP1c, sterol regulatory element-binding protein-1c
- TG, triacylglycerol
- VAT, visceral adipose tissue
- VLDL, very low density lipoprotein
- β-HAD, β-hydroxyacyl CoA dehydrogenase
- β-oxidation
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Affiliation(s)
- Christoph Dahlhoff
- Biochemistry Unit, Research Center for Nutrition and Food Sciences (ZIEL), Technische Universität München, 85350 Freising-Weihenstephan, Germany ; PhD Group - Epigenetics, Imprinting and Nutrition, Research Center for Nutrition and Food Sciences (ZIEL), Technische Universität München, 85350 Freising-Weihenstephan, Germany
| | - Stefanie Worsch
- Nutritional Medicine Unit, Research Center for Nutrition and Food Sciences (ZIEL), Technische Universität München, 85350 Freising-Weihenstephan, Germany
| | - Manuela Sailer
- Biochemistry Unit, Research Center for Nutrition and Food Sciences (ZIEL), Technische Universität München, 85350 Freising-Weihenstephan, Germany
| | - Björn A Hummel
- Clinical Chemistry and Laboratory Medicine/Central Laboratory, University Hospital of the Saarland, 66421 Homburg, Germany ; Clinical Haemostasiology and Transfusion Medicine, University Hospital of the Saarland, 66421 Homburg, Germany
| | - Jarlei Fiamoncini
- Biochemistry Unit, Research Center for Nutrition and Food Sciences (ZIEL), Technische Universität München, 85350 Freising-Weihenstephan, Germany
| | - Kirsten Uebel
- Nutritional Medicine Unit, Research Center for Nutrition and Food Sciences (ZIEL), Technische Universität München, 85350 Freising-Weihenstephan, Germany
| | - Rima Obeid
- Clinical Chemistry and Laboratory Medicine/Central Laboratory, University Hospital of the Saarland, 66421 Homburg, Germany
| | - Christian Scherling
- Biochemistry Unit, Research Center for Nutrition and Food Sciences (ZIEL), Technische Universität München, 85350 Freising-Weihenstephan, Germany
| | - Jürgen Geisel
- Clinical Chemistry and Laboratory Medicine/Central Laboratory, University Hospital of the Saarland, 66421 Homburg, Germany
| | - Bernhard L Bader
- PhD Group - Epigenetics, Imprinting and Nutrition, Research Center for Nutrition and Food Sciences (ZIEL), Technische Universität München, 85350 Freising-Weihenstephan, Germany ; Nutritional Medicine Unit, Research Center for Nutrition and Food Sciences (ZIEL), Technische Universität München, 85350 Freising-Weihenstephan, Germany
| | - Hannelore Daniel
- Biochemistry Unit, Research Center for Nutrition and Food Sciences (ZIEL), Technische Universität München, 85350 Freising-Weihenstephan, Germany
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