1
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Tobias F, Hummon AB. Lipidomic comparison of 2D and 3D colon cancer cell culture models. J Mass Spectrom 2022; 57:e4880. [PMID: 36028991 PMCID: PMC9526240 DOI: 10.1002/jms.4880] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2022] [Accepted: 07/21/2022] [Indexed: 06/10/2023]
Abstract
Altered lipid metabolism is one of the hallmarks of cancer. Cellular proliferation and de novo synthesis of lipids are related to cancer progression. In this study, we evaluated the lipidomic profile of two-dimensional (2D) monolayer and multicellular tumor spheroids from the HCT 116 colon carcinoma cell line. We utilized serial trypsinization on the spheroid samples to generate three cellular populations representing the proliferative, quiescent, and necrotic regions of the spheroid. This analysis enabled a comprehensive identification and quantification of lipids produced in each of the spheroid layer and 2D cultures. We show that lipid subclasses associated with lipid droplets form in oxygen-restricted and acidic regions of spheroids and are produced at higher levels than in 2D cultures. Additionally, sphingolipid production, which is implicated in cell death and survival pathways, is higher in spheroids relative to 2D cells. Finally, we show that increased numbers of lipids composed of polyunsaturated fatty acids (PUFAs) are produced in the quiescent and necrotic regions of the spheroid. The lipidomic signature for each region and cell culture type highlights the importance of understanding the spatial aspects of cancer biology. These results provide additional lipid biomarkers in colon cancer cells that can be further studied to target pivotal lipid production pathways.
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Affiliation(s)
- Fernando Tobias
- Department of Chemistry and BiochemistryThe Ohio State UniversityColumbusOhioUSA
| | - Amanda B. Hummon
- Department of Chemistry and BiochemistryThe Ohio State UniversityColumbusOhioUSA
- Comprehensive Cancer CenterThe Ohio State UniversityColumbusOhioUSA
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2
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Walker RE, Savinova OV, Pedersen TL, Newman JW, Shearer GC. Effects of inflammation and soluble epoxide hydrolase inhibition on oxylipin composition of very low-density lipoproteins in isolated perfused rat livers. Physiol Rep 2021; 9:e14480. [PMID: 33625776 PMCID: PMC7903942 DOI: 10.14814/phy2.14480] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Oxylipins are metabolites of polyunsaturated fatty acids that mediate cardiovascular health by attenuation of inflammation, vascular tone, hemostasis, and thrombosis. Very low-density lipoproteins (VLDL) contain oxylipins, but it is unknown whether the liver regulates their concentrations. In this study, we used a perfused liver model to observe the effect of inflammatory lipopolysaccharide (LPS) challenge and soluble epoxide hydrolase inhibition (sEHi) on VLDL oxylipins. A compartmental model of deuterium-labeled linoleic acid and palmitic acid incorporation into VLDL was also developed to assess the dependence of VLDL oxylipins on fatty acid incorporation rates. LPS decreased the total fatty acid VLDL content by 30% [6%,47%], and decreased final concentration of several oxylipins by a similar amount (13-HOTrE, 35% [4%,55%], -1.3 nM; 9(10)-EpODE, 29% [3%,49%], -2.0 nM; 15(16)-EpODE, 29% [2%,49%], -1.6 nM; AA-derived diols, 32% [5%,52%], -2.4 nM; 19(20)-DiHDPA, 31% [7%,50%], -1.0 nM). However, the EPA-derived epoxide, 17(18)-EpETE, was decreased by 75% [49%,88%], (-0.52 nM) with LPS, double the suppression of other oxylipins. sEHi increased final concentration of DHA epoxide, 16(17)-EpDPE, by 99% [35%,193%], (2.0 nM). Final VLDL-oxylipin concentrations with LPS treatment were not correlated with linoleic acid kinetics, suggesting they were independently regulated under inflammatory conditions. We conclude that the liver regulates oxylipin incorporation into VLDL, and the oxylipin content is altered by LPS challenge and by inhibition of the epoxide hydrolase pathway. This provides evidence for delivery of systemic oxylipin signals by VLDL transport.
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Affiliation(s)
- Rachel E. Walker
- Department of Nutritional SciencesThe Pennsylvania State UniversityUniversity ParkPAUSA
| | - Olga V. Savinova
- Department of Biomedical SciencesNew York Institute of Technology College of Osteopathic MedicineOld WestburyNYUSA
- Sanford ResearchUniversity of South DakotaSioux FallsSDUSA
| | - Theresa L. Pedersen
- Advanced AnalyticsDavisCAUSA
- Department of Food Science and TechnologyUniversity of CaliforniaDavisCAUSA
| | - John W. Newman
- Department of Food Science and TechnologyUniversity of CaliforniaDavisCAUSA
- Obesity and Metabolism Research UnitWestern Human Nutrition Research CenterAgricultural Research ServiceUS Department of AgricultureDavisCAUSA
| | - Gregory C. Shearer
- Department of Nutritional SciencesThe Pennsylvania State UniversityUniversity ParkPAUSA
- Sanford ResearchUniversity of South DakotaSioux FallsSDUSA
- Sanford School of MedicineUniversity of South DakotaSioux FallsSDUSA
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3
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Lin L, Metherel AH, Di Miceli M, Liu Z, Sahin C, Fioramonti X, Cummins CL, Layé S, Bazinet RP. Tetracosahexaenoylethanolamide, a novel N-acylethanolamide, is elevated in ischemia and increases neuronal output. J Lipid Res 2020; 61:1480-1490. [PMID: 32826272 DOI: 10.1194/jlr.ra120001024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
N-acylethanolamines (NAEs) are endogenous lipid-signaling molecules derived from fatty acids that regulate numerous biological functions, including in the brain. Interestingly, NAEs are elevated in the absence of fatty acid amide hydrolase (FAAH) and following CO2-induced ischemia/hypercapnia, suggesting a neuroprotective response. Tetracosahexaenoic acid (THA) is a product and precursor to DHA; however, the NAE product, tetracosahexaenoylethanolamide (THEA), has never been reported. Presently, THEA was chemically synthesized as an authentic standard to confirm THEA presence in biological tissues. Whole brains were collected and analyzed for unesterified THA, total THA, and THEA in wild-type and FAAH-KO mice that were euthanized by either head-focused microwave fixation, CO2 + microwave, or CO2 only. PPAR activity by transient transfection assay and ex vivo neuronal output in medium spiny neurons (MSNs) of the nucleus accumbens by patch clamp electrophysiology were determined following THEA exposure. THEA in the wild-type mice was nearly doubled (P < 0.05) following ischemia/hypercapnia (CO2 euthanization) and up to 12 times higher (P < 0.001) in the FAAH-KO compared with wild-type. THEA did not increase (P > 0.05) transcriptional activity of PPARs relative to control, but 100 nM of THEA increased (P < 0.001) neuronal output in MSNs of the nucleus accumbens. Here were identify a novel NAE, THEA, in the brain that is elevated upon ischemia/hypercapnia and by KO of the FAAH enzyme. While THEA did not activate PPAR, it augmented the excitability of MSNs in the nucleus accumbens. Overall, our results suggest that THEA is a novel NAE that is produced in the brain upon ischemia/hypercapnia and regulates neuronal excitation.
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Affiliation(s)
- Lin Lin
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Adam H Metherel
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Mathieu Di Miceli
- Université de Bordeaux, INRA, Bordeaux INP, NutriNeuro, UMR 1286, Bordeaux, France
| | - Zhen Liu
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
| | - Cigdem Sahin
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, Ontario, Canada
| | - Xavier Fioramonti
- Université de Bordeaux, INRA, Bordeaux INP, NutriNeuro, UMR 1286, Bordeaux, France
| | - Carolyn L Cummins
- Department of Pharmaceutical Sciences, University of Toronto, Toronto, Ontario, Canada
| | - Sophie Layé
- Université de Bordeaux, INRA, Bordeaux INP, NutriNeuro, UMR 1286, Bordeaux, France
| | - Richard P Bazinet
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada
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4
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Jay AG, Simard JR, Huang N, Hamilton JA. SSO and other putative inhibitors of FA transport across membranes by CD36 disrupt intracellular metabolism, but do not affect FA translocation. J Lipid Res 2020; 61:790-807. [PMID: 32102800 DOI: 10.1194/jlr.ra120000648] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 02/19/2020] [Indexed: 12/19/2022] Open
Abstract
Membrane-bound proteins have been proposed to mediate the transport of long-chain FA (LCFA) transport through the plasma membrane (PM). These proposals are based largely on reports that PM transport of LCFAs can be blocked by a number of enzymes and purported inhibitors of LCFA transport. Here, using the ratiometric pH indicator (2',7'-bis-(2-carboxyethyl)-5-(and-6-)-carboxyfluorescein and acrylodated intestinal FA-binding protein-based dual fluorescence assays, we investigated the effects of nine inhibitors of the putative FA transporter protein CD36 on the binding and transmembrane movement of LCFAs. We particularly focused on sulfosuccinimidyl oleate (SSO), reported to be a competitive inhibitor of CD36-mediated LCFA transport. Using these assays in adipocytes and inhibitor-treated protein-free lipid vesicles, we demonstrate that rapid LCFA transport across model and biological membranes remains unchanged in the presence of these purported inhibitors. We have previously shown in live cells that CD36 does not accelerate the transport of unesterified LCFAs across the PM. Our present experiments indicated disruption of LCFA metabolism inside the cell within minutes upon treatment with many of the "inhibitors" previously assumed to inhibit LCFA transport across the PM. Furthermore, using confocal microscopy and a specific anti-SSO antibody, we found that numerous intracellular and PM-bound proteins are SSO-modified in addition to CD36. Our results support the hypothesis that LCFAs diffuse rapidly across biological membranes and do not require an active protein transporter for their transmembrane movement.
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Affiliation(s)
- Anthony G Jay
- Department of Physiology and Biomedical Engineering,Mayo Clinic, Rochester, MN 55905; Departments of Biochemistry,Boston University School of Medicine, Boston, MA 02118. mailto:
| | - Jeffrey R Simard
- Physiology and Biophysics,Boston University School of Medicine, Boston, MA 02118; Pharmacology and Experimental Therapeutics,Boston University School of Medicine, Boston, MA 02118
| | - Nasi Huang
- Section of Infectious Diseases Department of Medicine,Boston University School of Medicine, Boston, MA 02118
| | - James A Hamilton
- Physiology and Biophysics,Boston University School of Medicine, Boston, MA 02118
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Hama K, Fujiwara Y, Takashima S, Hayashi Y, Yamashita A, Shimozawa N, Yokoyama K. Hexacosenoyl-CoA is the most abundant very long-chain acyl-CoA in ATP binding cassette transporter D1-deficient cells. J Lipid Res 2020; 61:523-536. [PMID: 32075856 PMCID: PMC7112142 DOI: 10.1194/jlr.p119000325] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 02/14/2020] [Indexed: 01/01/2023] Open
Abstract
X-linked adrenoleukodystrophy (X-ALD) is an inherited disorder caused by deleterious mutations in the ABCD1 gene. The ABCD1 protein transports very long-chain FAs (VLCFAs) from the cytosol into the peroxisome where the VLCFAs are degraded through β-oxidation. ABCD1 dysfunction leads to VLCFA accumulation in individuals with X-ALD. FAs are activated by esterification to CoA before metabolic utilization. However, the intracellular pools and metabolic profiles of individual acyl-CoA esters have not been fully analyzed. In this study, we profiled the acyl-CoA species in fibroblasts from X-ALD patients and in ABCD1-deficient HeLa cells. We found that hexacosenoyl (26:1)-CoA, but not hexacosanoyl (26:0)-CoA, was the most abundantly concentrated among the VLCFA-CoA species in these cells. We also show that 26:1-CoA is mainly synthesized from oleoyl-CoA, and the metabolic turnover rate of 26:1-CoA was almost identical to that of oleoyl-CoA in both WT and ABCD1-deficient HeLa cells. The findings of our study provide precise quantitative and metabolic information of each acyl-CoA species in living cells. Our results suggest that VLCFA is endogenously synthesized as VLCFA-CoA through a FA elongation pathway and is then efficiently converted to other metabolites, such as phospholipids, in the absence of ABCD1.
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Affiliation(s)
- Kotaro Hama
- Faculty of Pharma-Science, Teikyo University, Itabashi-ku, Tokyo 173-8605, Japan
| | - Yuko Fujiwara
- Faculty of Pharma-Science, Teikyo University, Itabashi-ku, Tokyo 173-8605, Japan
| | - Shigeo Takashima
- Division of Genomics Research, Life Science Research Center, Gifu University, Gifu 501-1193, Japan
| | - Yasuhiro Hayashi
- Faculty of Pharma-Science, Teikyo University, Itabashi-ku, Tokyo 173-8605, Japan
| | - Atsushi Yamashita
- Faculty of Pharma-Science, Teikyo University, Itabashi-ku, Tokyo 173-8605, Japan
| | - Nobuyuki Shimozawa
- Division of Genomics Research, Life Science Research Center, Gifu University, Gifu 501-1193, Japan
| | - Kazuaki Yokoyama
- Faculty of Pharma-Science, Teikyo University, Itabashi-ku, Tokyo 173-8605, Japan
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6
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Høyer KL, Høgild ML, List EO, Lee KY, Kissinger E, Sharma R, Erik Magnusson N, Puri V, Kopchick JJ, Jørgensen JOL, Jessen N. The acute effects of growth hormone in adipose tissue is associated with suppression of antilipolytic signals. Physiol Rep 2020; 8:e14373. [PMID: 32073221 PMCID: PMC7029434 DOI: 10.14814/phy2.14373] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2019] [Revised: 01/19/2020] [Accepted: 01/21/2020] [Indexed: 02/07/2023] Open
Abstract
AIM Since GH stimulates lipolysis in vivo after a 2-hr lag phase, we studied whether this involves GH signaling and gene expression in adipose tissue (AT). METHODS Human subjects (n = 9) each underwent intravenous exposure to GH versus saline with measurement of serum FFA, and GH signaling, gene array, and protein in AT biopsies after 30-120 min. Human data were corroborated in adipose-specific GH receptor knockout (FaGHRKO) mice versus wild-type mice. Expression of candidate genes identified in the array were investigated in 3T3-L1 adipocytes. RESULTS GH increased serum FFA and AT phosphorylation of STAT5b in human subjects. This was replicated in wild-type mice, but not in FaGHRKO mice. The array identified 53 GH-regulated genes, and Ingenuity Pathway analysis showed downregulation of PDE3b, an insulin-dependent antilipolytic signal, upregulation of PTEN that inhibits insulin-dependent antilipolysis, and downregulation of G0S2 and RASD1, both encoding antilipolytic proteins. This was confirmed in 3T3-L1 adipocytes, except for PDE3B, including reciprocal effects of GH and insulin on mRNA expression of PTEN, RASD1, and G0S2. CONCLUSION (a) GH directly stimulates AT lipolysis in a GHR-dependent manner, (b) this involves suppression of antilipolytic signals at the level of gene expression, (c) the underlying GH signaling pathways remain to be defined.
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Affiliation(s)
- Katrine L. Høyer
- Medical Research LaboratoryDepartment of Clinical Medicine, HealthAarhus UniversityAarhusDenmark
- Department of EndocrinologyAarhus University HospitalAarhusDenmark
| | - Morten L. Høgild
- Medical Research LaboratoryDepartment of Clinical Medicine, HealthAarhus UniversityAarhusDenmark
- Department of EndocrinologyAarhus University HospitalAarhusDenmark
| | - Edward O. List
- The Edison Biotechnology InstituteAthensOHUSA
- Heritage College of Osteopathic MedicineOhio UniversityAthensOHUSA
| | - Kevin Y. Lee
- Heritage College of Osteopathic MedicineOhio UniversityAthensOHUSA
| | - Emily Kissinger
- Heritage College of Osteopathic MedicineOhio UniversityAthensOHUSA
| | - Rita Sharma
- Heritage College of Osteopathic MedicineOhio UniversityAthensOHUSA
| | - Nils Erik Magnusson
- Medical Research LaboratoryDepartment of Clinical Medicine, HealthAarhus UniversityAarhusDenmark
- Department of EndocrinologyAarhus University HospitalAarhusDenmark
| | - Vishwajeet Puri
- Heritage College of Osteopathic MedicineOhio UniversityAthensOHUSA
| | - John J. Kopchick
- The Edison Biotechnology InstituteAthensOHUSA
- Heritage College of Osteopathic MedicineOhio UniversityAthensOHUSA
| | - Jens O. L. Jørgensen
- Medical Research LaboratoryDepartment of Clinical Medicine, HealthAarhus UniversityAarhusDenmark
- Department of EndocrinologyAarhus University HospitalAarhusDenmark
| | - Niels Jessen
- Department of Clinical PharmacologyUniversity of AarhusAarhusDenmark
- Department of BiomedicineAarhus UniversityAarhusDenmark
- Steno Diabetes Center AarhusAarhus University HospitalAarhusDenmark
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7
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Jung HS, Shimizu-Albergine M, Shen X, Kramer F, Shao D, Vivekanandan-Giri A, Pennathur S, Tian R, Kanter JE, Bornfeldt KE. TNF-α induces acyl-CoA synthetase 3 to promote lipid droplet formation in human endothelial cells. J Lipid Res 2020; 61:33-44. [PMID: 31722970 PMCID: PMC6939593 DOI: 10.1194/jlr.ra119000256] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 10/22/2019] [Indexed: 01/20/2023] Open
Abstract
Chronic inflammation contributes to cardiovascular disease. Increased levels of the inflammatory cytokine, TNF-α, are often present in conditions associated with cardiovascular disease risk, and TNF-α induces a number of pro-atherogenic effects in macrovascular endothelial cells, including expression of adhesion molecules and chemokines, and lipoprotein uptake and transcytosis to the subendothelial tissue. However, little is known about the roles of acyl-CoA synthetases (ACSLs), enzymes that esterify free fatty acids into their acyl-CoA derivatives, or about the effects of TNF-α on ACSLs in endothelial cells. Therefore, we investigated the effects of TNF-α on ACSLs and downstream lipids in cultured human coronary artery endothelial cells and human umbilical vein endothelial cells. We demonstrated that TNF-α induces ACSL1, ACSL3, and ACSL5, but not ACSL4, in both cell types. TNF-α also increased oleoyl-CoA levels, consistent with the increased ACSL3 expression. RNA-sequencing demonstrated that knockdown of ACSL3 had no marked effects on the TNF-α transcriptome. Instead, ACSL3 was required for TNF-α-induced lipid droplet formation in cells exposed to oleic acid. These results demonstrate that increased acyl-CoA synthesis as a result of ACSL3 induction is part of the TNF-α response in human macrovascular endothelial cells.
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Affiliation(s)
- Hye Seung Jung
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington Medicine Diabetes Institute, University of Washington, Seattle, WA 98109
| | - Masami Shimizu-Albergine
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington Medicine Diabetes Institute, University of Washington, Seattle, WA 98109
| | - Xia Shen
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington Medicine Diabetes Institute, University of Washington, Seattle, WA 98109
| | - Farah Kramer
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington Medicine Diabetes Institute, University of Washington, Seattle, WA 98109
| | - Dan Shao
- Departments of Anesthesiology and Pain Medicine, University of Washington, Seattle, WA 98109
| | | | | | - Rong Tian
- Departments of Anesthesiology and Pain Medicine, University of Washington, Seattle, WA 98109
| | - Jenny E Kanter
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington Medicine Diabetes Institute, University of Washington, Seattle, WA 98109
| | - Karin E Bornfeldt
- Department of Medicine, Division of Metabolism, Endocrinology, and Nutrition, University of Washington Medicine Diabetes Institute, University of Washington, Seattle, WA 98109; Pathology, University of Washington, Seattle, WA 98109.
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8
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Tardelli M, Bruschi FV, Claudel T, Fuchs CD, Auer N, Kunczer V, Stojakovic T, Scharnagl H, Habib A, Grabner GF, Zimmermann R, Lotersztajn S, Trauner M. Lack of monoacylglycerol lipase prevents hepatic steatosis by favoring lipid storage in adipose tissue and intestinal malabsorption. J Lipid Res 2019; 60:1284-1292. [PMID: 31048404 DOI: 10.1194/jlr.m093369] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 05/02/2019] [Indexed: 12/14/2022] Open
Abstract
Monoacylglycerol lipase (MGL) is the rate-limiting enzyme in the degradation of monoacylglycerols. To examine the role of MGL in hepatic steatosis, WT and MGL KO (MGL-/-) mice were challenged with a Western diet (WD) over 12 weeks. Lipid metabolism, inflammation, and fibrosis were assessed by serum biochemistry, histology, and gene-expression profiling of liver and adipose depots. Intestinal fat absorption was measured by gas chromatography. Primary adipocyte and 3T3-L1 cells were analyzed by flow cytometry and Western blot. Human hepatocytes were treated with MGL inhibitor JZL184. The absence of MGL protected mice from hepatic steatosis by repressing key lipogenic enzymes in liver (Srebp1c, Pparγ2, and diacylglycerol O-acyltransferase 1), while promoting FA oxidation. Liver inflammation was diminished in MGL-/- mice fed a WD, as evidenced by diminished epidermal growth factor-like module-containing mucin-like hormone receptor-like 1 (F4/80) staining and C-C motif chemokine ligand 2 gene expression, whereas fibrosis remained unchanged. Absence of MGL promoted fat storage in gonadal white adipose tissue (gWAT) with increased lipogenesis and unchanged lipolysis, diminished inflammation in gWAT, and subcutaneous AT. Intestinal fat malabsorption prevented ectopic lipid accumulation in livers of MGL-/- mice fed a WD. In vitro experiments demonstrated increased adipocyte size/lipid content driven by PPARγ. In conclusion, our data uncover that MGL deletion improves some aspects of nonalcoholic fatty liver disease by promoting lipid storage in gWAT and fat malabsorption.
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Affiliation(s)
- Matteo Tardelli
- Hans Popper Laboratory of Molecular Hepatology, Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Francesca V Bruschi
- Hans Popper Laboratory of Molecular Hepatology, Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Thierry Claudel
- Hans Popper Laboratory of Molecular Hepatology, Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Claudia D Fuchs
- Hans Popper Laboratory of Molecular Hepatology, Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Nicole Auer
- Hans Popper Laboratory of Molecular Hepatology, Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Victoria Kunczer
- Hans Popper Laboratory of Molecular Hepatology, Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
| | - Tatjana Stojakovic
- Clinical Institute of Medical and Chemical Laboratory Diagnostics University Hospital Graz, Graz, Austria
| | - Hubert Scharnagl
- Clinical Institute of Medical and Chemical Laboratory Diagnostics Medical University of Graz, Graz, Austria
| | - Aida Habib
- INSERM-UMR1149, Centre de Recherche sur l'Inflammation, Paris, France.,Department of Biochemistry and Molecular Genetics American University of Beirut, Beirut, Lebanon
| | - Gernot F Grabner
- Institute of Molecular Biosciences University of Graz, Graz, Austria
| | - Robert Zimmermann
- Institute of Molecular Biosciences University of Graz, Graz, Austria
| | | | - Michael Trauner
- Hans Popper Laboratory of Molecular Hepatology, Division of Gastroenterology and Hepatology, Department of Internal Medicine III, Medical University of Vienna, Vienna, Austria
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9
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Exner T, Beretta CA, Gao Q, Afting C, Romero-Brey I, Bartenschlager R, Fehring L, Poppelreuther M, Füllekrug J. Lipid droplet quantification based on iterative image processing. J Lipid Res 2019; 60:1333-1344. [PMID: 30926625 DOI: 10.1194/jlr.d092841] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 03/28/2019] [Indexed: 12/15/2022] Open
Abstract
Lipid droplets (LDs) are ubiquitous and highly dynamic subcellular organelles required for the storage of neutral lipids. LD number and size distribution are key parameters affected not only by nutrient supply but also by lipotoxic stress and metabolic regulation. Current methods for LD quantification lack general applicability and are either based on time consuming manual evaluation or show limitations if LDs are high in numbers or closely clustered. Here, we present an ImageJ-based approach for the detection and quantification of LDs stained by neutral lipid dyes in images acquired by conventional wide-field fluorescence microscopy. The method features an adjustable preprocessing procedure that resolves LD clusters. LD identification is based on their circular edges and central fluorescence intensity maxima. Adaptation to different cell types is mediated by a set of interactive parameters. Validation was done for three different cell lines using manual evaluation of LD numbers and volume measurement by 3D rendering of confocal datasets. In an application example, we show that overexpression of the acyl-CoA synthetase, FATP4/ACSVL5, in oleate-treated COS7 cells increased the size of LDs but not their number.
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Affiliation(s)
- Tarik Exner
- Molecular Cell Biology Laboratory Internal Medicine IV, Heidelberg University, Heidelberg, Germany
| | - Carlo A Beretta
- CellNetworks Math-Clinic Core Facility, BioQuant Heidelberg University, Heidelberg, Germany
| | - Qi Gao
- CellNetworks Math-Clinic Core Facility, BioQuant Heidelberg University, Heidelberg, Germany
| | - Cassian Afting
- Molecular Cell Biology Laboratory Internal Medicine IV, Heidelberg University, Heidelberg, Germany
| | - Inés Romero-Brey
- Department of Infectious Diseases, Molecular Virology Heidelberg University, Heidelberg, Germany
| | - Ralf Bartenschlager
- Department of Infectious Diseases, Molecular Virology Heidelberg University, Heidelberg, Germany.,Department of Virus-Associated Carcinogenesis, German Cancer Research Center, Heidelberg, Germany
| | - Leonard Fehring
- Molecular Cell Biology Laboratory Internal Medicine IV, Heidelberg University, Heidelberg, Germany
| | - Margarete Poppelreuther
- Molecular Cell Biology Laboratory Internal Medicine IV, Heidelberg University, Heidelberg, Germany
| | - Joachim Füllekrug
- Molecular Cell Biology Laboratory Internal Medicine IV, Heidelberg University, Heidelberg, Germany
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10
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Metherel AH, Lacombe RJS, Chouinard-Watkins R, Bazinet RP. Docosahexaenoic acid is both a product of and a precursor to tetracosahexaenoic acid in the rat. J Lipid Res 2018; 60:412-420. [PMID: 30573561 DOI: 10.1194/jlr.m090373] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 12/18/2018] [Indexed: 12/28/2022] Open
Abstract
Tetracosahexaeoic acid (THA; 24:6n-3) is thought to be the immediate precursor of DHA in rodents; however, the relationship between THA and DHA metabolism has not been assessed in vivo. Here, we infused unesterified 2H5-THA and 13C22-DHA, at a steady state, into two groups of male Long-Evans rats and determined the synthesis-secretion kinetics, including daily synthesis-secretion rates of all 20-24 carbon n-3 PUFAs. We determined that the synthesis-secretion coefficient (a measure of the capacity to synthesize a given fatty acid) for the synthesis of DHA from plasma unesterified THA to be 134-fold higher than for THA from DHA. However, when considering the significantly higher endogenous plasma unesterified DHA pool, the daily synthesis-secretion rates were only 7-fold higher for DHA synthesis from THA (96.3 ± 31.3 nmol/d) compared with that for THA synthesis from DHA (11.4 ± 4.1 nmol/d). Furthermore, plasma unesterified THA was converted to DHA and secreted into the plasma at a 2.5-fold faster rate than remaining as THA itself (26.2 ± 6.3 nmol/d), supporting THA's primary role as a precursor to DHA. In conclusion, using a 3 h infusion model in rats, we demonstrate for the first time in vivo that DHA is both a product and a precursor to THA.
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Affiliation(s)
- Adam H Metherel
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - R J Scott Lacombe
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Raphaël Chouinard-Watkins
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Richard P Bazinet
- Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, Toronto, Ontario M5S 1A8, Canada
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11
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Desai A, Alves-Bezerra M, Li Y, Ozdemir C, Bare CJ, Li Y, Hagen SJ, Cohen DE. Regulation of fatty acid trafficking in liver by thioesterase superfamily member 1. J Lipid Res 2018; 59:368-379. [PMID: 29208699 PMCID: PMC5794430 DOI: 10.1194/jlr.m081455] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Revised: 12/04/2017] [Indexed: 12/13/2022] Open
Abstract
Thioesterase superfamily member 1 (Them1) is an acyl-CoA thioesterase that is highly expressed in brown adipose tissue, where it functions to suppress energy expenditure. Lower Them1 expression levels in the liver are upregulated in response to high-fat feeding. Them1-/- mice are resistant to diet-induced obesity, hepatic steatosis, and glucose intolerance, but the contribution of Them1 in liver is unclear. To examine its liver-specific functions, we created conditional transgenic mice, which, when bred to Them1-/- mice and activated, expressed Them1 exclusively in the liver. Mice with liver-specific Them1 expression exhibited no changes in energy expenditure. Rates of fatty acid oxidation were increased, whereas hepatic VLDL triglyceride secretion rates were decreased by hepatic Them1 expression. When fed a high-fat diet, Them1 expression in liver promoted excess steatosis in the setting of reduced rates of fatty acid oxidation and preserved glycerolipid synthesis. Liver-specific Them1 expression did not influence glucose tolerance or insulin sensitivity, but did promote hepatic gluconeogenesis in high-fat-fed animals. This was attributable to the generation of excess fatty acids, which activated PPARα and promoted expression of gluconeogenic genes. These findings reveal a regulatory role for Them1 in hepatocellular fatty acid trafficking.
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Affiliation(s)
- Anal Desai
- Joan & Sanford I. Weill Department of Medicine, Weill Cornell Medical College, New York, NY 10021
| | - Michele Alves-Bezerra
- Joan & Sanford I. Weill Department of Medicine, Weill Cornell Medical College, New York, NY 10021
| | - Yingxia Li
- Joan & Sanford I. Weill Department of Medicine, Weill Cornell Medical College, New York, NY 10021
| | - Cafer Ozdemir
- Department of Biochemistry, Boston University School of Medicine, Boston, MA 02118
| | - Curtis J Bare
- Joan & Sanford I. Weill Department of Medicine, Weill Cornell Medical College, New York, NY 10021
| | - Yue Li
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
| | - Susan J Hagen
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215
| | - David E Cohen
- Joan & Sanford I. Weill Department of Medicine, Weill Cornell Medical College, New York, NY 10021
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12
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Cruz-Gil S, Sanchez-Martinez R, Gomez de Cedron M, Martin-Hernandez R, Vargas T, Molina S, Herranz J, Davalos A, Reglero G, Ramirez de Molina A. Targeting the lipid metabolic axis ACSL/SCD in colorectal cancer progression by therapeutic miRNAs: miR-19b-1 role. J Lipid Res 2018; 59:14-24. [PMID: 29074607 PMCID: PMC5748493 DOI: 10.1194/jlr.m076752] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 10/05/2017] [Indexed: 02/06/2023] Open
Abstract
An abnormal acyl-CoA synthetase/stearoyl-CoA desaturase (ACSL/SCD) lipid network fuels colon cancer progression, endowing cells with invasive and migratory properties. Therapies against this metabolic network may be useful to improve clinical outcomes. Because micro-RNAs (miRNAs/miRs) are important epigenetic regulators, we investigated novel miRNAs targeting this pro-tumorigenic axis; hence to be used as therapeutic or prognostic miRNAs. Thirty-one putative common miRNAs were predicted to simultaneously target the three enzymes comprising the ACSL/SCD network. Target validation by quantitative RT-PCR, Western blotting, and luciferase assays showed miR-544a, miR-142, and miR-19b-1 as major regulators of the metabolic axis, ACSL/SCD Importantly, lower miR-19b-1 expression was associated with a decreased survival rate in colorectal cancer (CRC) patients, accordingly with ACSL/SCD involvement in patient relapse. Finally, miR-19b-1 regulated the pro-tumorigenic axis, ACSL/SCD, being able to inhibit invasion in colon cancer cells. Because its expression correlated with an increased survival rate in CRC patients, we propose miR-19b-1 as a potential noninvasive biomarker of disease-free survival and a promising therapeutic miRNA in CRC.
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Affiliation(s)
- Silvia Cruz-Gil
- Molecular Oncology and Nutritional Genomics of Cancer Group, Instituto Madrileño de Estudios Avanzados (IMDEA) Food Institute, CEI UAM+CSIC, Madrid, Spain
| | - Ruth Sanchez-Martinez
- Molecular Oncology and Nutritional Genomics of Cancer Group, Instituto Madrileño de Estudios Avanzados (IMDEA) Food Institute, CEI UAM+CSIC, Madrid, Spain
| | - Marta Gomez de Cedron
- Molecular Oncology and Nutritional Genomics of Cancer Group, Instituto Madrileño de Estudios Avanzados (IMDEA) Food Institute, CEI UAM+CSIC, Madrid, Spain
| | - Roberto Martin-Hernandez
- Bioinformatics Unit, Instituto Madrileño de Estudios Avanzados (IMDEA) Food Institute, CEI UAM+CSIC, Madrid, Spain
| | - Teodoro Vargas
- Molecular Oncology and Nutritional Genomics of Cancer Group, Instituto Madrileño de Estudios Avanzados (IMDEA) Food Institute, CEI UAM+CSIC, Madrid, Spain
| | - Susana Molina
- Molecular Oncology and Nutritional Genomics of Cancer Group, Instituto Madrileño de Estudios Avanzados (IMDEA) Food Institute, CEI UAM+CSIC, Madrid, Spain
| | - Jesús Herranz
- Biostatistics Unit, Instituto Madrileño de Estudios Avanzados (IMDEA) Food Institute, CEI UAM+CSIC, Madrid, Spain
| | - Alberto Davalos
- Disorders of Lipid Metabolism and Molecular Nutrition Group, Instituto Madrileño de Estudios Avanzados (IMDEA) Food Institute, CEI UAM+CSIC, Madrid, Spain
| | - Guillermo Reglero
- Molecular Oncology and Nutritional Genomics of Cancer Group, Instituto Madrileño de Estudios Avanzados (IMDEA) Food Institute, CEI UAM+CSIC, Madrid, Spain
| | - Ana Ramirez de Molina
- Molecular Oncology and Nutritional Genomics of Cancer Group, Instituto Madrileño de Estudios Avanzados (IMDEA) Food Institute, CEI UAM+CSIC, Madrid, Spain
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13
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Valentine WJ, Tokuoka SM, Hishikawa D, Kita Y, Shindou H, Shimizu T. LPAAT3 incorporates docosahexaenoic acid into skeletal muscle cell membranes and is upregulated by PPARδ activation. J Lipid Res 2017; 59:184-194. [PMID: 29284664 PMCID: PMC5794415 DOI: 10.1194/jlr.m077321] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [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: 05/01/2017] [Revised: 11/30/2017] [Indexed: 12/31/2022] Open
Abstract
Adaption of skeletal muscle to endurance exercise includes PPARδ- and AMP-activated protein kinase (AMPK)/PPARγ coactivator 1α-mediated transcriptional responses that result in increased oxidative capacity and conversion of glycolytic to more oxidative fiber types. These changes are associated with whole-body metabolic alterations including improved glucose handling and resistance to obesity. Increased DHA (22:6n-3) content in phosphatidylcholine (PC) and phosphatidylethanolamine (PE) is also reported in endurance exercise-trained glycolytic muscle; however, the DHA-metabolizing enzymes involved and the biological significance of the enhanced DHA content are unknown. In the present study, we identified lysophosphatidic acid acyltransferase (LPAAT)3 as an enzyme that was upregulated in myoblasts during in vitro differentiation and selectively incorporated DHA into PC and PE. LPAAT3 expression was increased by pharmacological activators of PPARδ or AMPK, and combination treatment led to further increased LPAAT3 expression and enhanced incorporation of DHA into PC and PE. Our results indicate that LPAAT3 was upregulated by exercise-induced signaling pathways and suggest that LPAAT3 may also contribute to the enhanced phospholipid-DHA content of endurance-trained muscles. Identification of DHA-metabolizing enzymes in the skeletal muscle will help to elucidate broad metabolic effects of DHA.
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Affiliation(s)
- William J Valentine
- Department of Lipid Signaling, National Center for Global Health and Medicine, Shinjuku-ku, Tokyo 162-8655, Japan
| | - Suzumi M Tokuoka
- Departments of Lipidomics University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Daisuke Hishikawa
- Department of Lipid Signaling, National Center for Global Health and Medicine, Shinjuku-ku, Tokyo 162-8655, Japan
| | - Yoshihiro Kita
- Departments of Lipidomics University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.,Life Sciences Core Facility, Graduate School of Medicine, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Hideo Shindou
- Department of Lipid Signaling, National Center for Global Health and Medicine, Shinjuku-ku, Tokyo 162-8655, Japan .,Lipid Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan.,Japan Agency for Medical Research and Development (AMED) Chiyoda-ku, Tokyo 100-0004, Japan
| | - Takao Shimizu
- Department of Lipid Signaling, National Center for Global Health and Medicine, Shinjuku-ku, Tokyo 162-8655, Japan.,Departments of Lipidomics University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
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14
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Bond LM, Ntambi JM. UCP1 deficiency increases adipose tissue monounsaturated fatty acid synthesis and trafficking to the liver. J Lipid Res 2017; 59:224-236. [PMID: 29203476 DOI: 10.1194/jlr.m078469] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 11/28/2017] [Indexed: 12/26/2022] Open
Abstract
Uncoupling protein-1 (UCP1) facilitates thermogenesis in brown and beige adipocytes and can promote energy expenditure by decreasing mitochondrial respiratory efficiency. Defects in UCP1 and brown adipose tissue thermogenesis subject animals to chronic cold stress and elicit compensatory responses to generate heat. How UCP1 regulates white adipose tissue (WAT) lipid biology and tissue crosstalk is not completely understood. Here, we probed the effect of UCP1 deficiency on FA metabolism in inguinal and epididymal WAT and investigated how these metabolic perturbations influence hepatic lipid homeostasis. We report that at standard housing temperature (21°C), loss of UCP1 induces inguinal WAT de novo lipogenesis through transcriptional activation of the lipogenic gene program and elevated GLUT4. Inguinal adipocyte hyperplasia and depot expansion accompany the increase in lipid synthesis. We also found that UCP1 deficiency elevates adipose stearoyl-CoA desaturase gene expression, and increased inguinal WAT lipolysis supports the transport of adipose-derived palmitoleate (16:1n7) to the liver and hepatic triglyceride accumulation. The observed WAT and liver phenotypes were resolved by housing animals at thermoneutral housing (30°C). These data illustrate depot-specific responses to impaired BAT thermogenesis and communication between WAT and liver in UCP1-/- mice.
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Affiliation(s)
- Laura M Bond
- Departments of Biochemistry University of Wisconsin-Madison, Madison, WI 53706
| | - James M Ntambi
- Departments of Biochemistry University of Wisconsin-Madison, Madison, WI 53706 .,Nutritional Sciences, University of Wisconsin-Madison, Madison, WI 53706
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15
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Feng YZ, Lund J, Li Y, Knabenes IK, Bakke SS, Kase ET, Lee YK, Kimmel AR, Thoresen GH, Rustan AC, Dalen KT. Loss of perilipin 2 in cultured myotubes enhances lipolysis and redirects the metabolic energy balance from glucose oxidation towards fatty acid oxidation. J Lipid Res 2017; 58:2147-2161. [PMID: 28822960 DOI: 10.1194/jlr.m079764] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2017] [Indexed: 02/07/2023] Open
Abstract
Lipid droplet (LD) coating proteins are essential for the formation and stability of intracellular LDs. Plin2 is an abundant LD coating protein in skeletal muscle, but its importance for muscle function is unclear. We show that myotubes established from Plin2-/- mice contain reduced content of LDs and accumulate less oleic acid (OA) in triacylglycerol (TAG) due to elevated LD hydrolysis in comparison with Plin2+/+ myotubes. The reduced ability to store TAG in LDs in Plin2-/- myotubes is accompanied by a shift in energy metabolism. Plin2-/- myotubes are characterized by increased oxidation of OA, lower glycogen synthesis, and reduced glucose oxidation in comparison with Plin2+/+ myotubes, perhaps reflecting competition between FAs and glucose as part of the Randle cycle. In accord with these metabolic changes, Plin2-/- myotubes have elevated expression of Ppara and Ppargc1a, transcription factors that stimulate expression of genes important for FA oxidation, whereas genes involved in glucose uptake and oxidation are suppressed. Loss of Plin2 had no impact on insulin-stimulated Akt phosphorylation. Our results suggest that Plin2 is essential for protecting the pool of skeletal muscle LDs to avoid an uncontrolled hydrolysis of stored TAG and to balance skeletal muscle energy metabolism.
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Affiliation(s)
- Yuan Z Feng
- Department of Pharmaceutical Biosciences, School of Pharmacy, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
| | - Jenny Lund
- Department of Pharmaceutical Biosciences, School of Pharmacy, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
| | - Yuchuan Li
- Department of Nutrition, University of Oslo, Oslo, Norway
| | - Irlin K Knabenes
- Department of Pharmaceutical Biosciences, School of Pharmacy, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
| | - Siril S Bakke
- Department of Pharmaceutical Biosciences, School of Pharmacy, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
| | - Eili T Kase
- Department of Pharmaceutical Biosciences, School of Pharmacy, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
| | - Yun K Lee
- Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
| | - Alan R Kimmel
- Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD
| | - G Hege Thoresen
- Department of Pharmaceutical Biosciences, School of Pharmacy, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway.,Department of Pharmacology, Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Arild Christian Rustan
- Department of Pharmaceutical Biosciences, School of Pharmacy, Faculty of Mathematics and Natural Sciences, University of Oslo, Oslo, Norway
| | - Knut Tomas Dalen
- Department of Nutrition, University of Oslo, Oslo, Norway .,The Norwegian Transgenic Center, Institute of Basic Medical Sciences, University of Oslo, Oslo, Norway
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16
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Hu Y, Tanaka T, Zhu J, Guan W, Wu JHY, Psaty BM, McKnight B, King IB, Sun Q, Richard M, Manichaikul A, Frazier-Wood AC, Kabagambe EK, Hopkins PN, Ordovas JM, Ferrucci L, Bandinelli S, Arnett DK, Chen YDI, Liang S, Siscovick DS, Tsai MY, Rich SS, Fornage M, Hu FB, Rimm EB, Jensen MK, Lemaitre RN, Mozaffarian D, Steffen LM, Morris AP, Li H, Lin X. Discovery and fine-mapping of loci associated with MUFAs through trans-ethnic meta-analysis in Chinese and European populations. J Lipid Res 2017; 58:974-981. [PMID: 28298293 PMCID: PMC5408616 DOI: 10.1194/jlr.p071860] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 02/17/2017] [Indexed: 11/20/2022] Open
Abstract
MUFAs are unsaturated FAs with one double bond and are derived from endogenous synthesis and dietary intake. Accumulating evidence has suggested that plasma and erythrocyte MUFA levels are associated with cardiometabolic disorders, including CVD, T2D, and metabolic syndrome (MS). Previous genome-wide association studies (GWASs) have identified seven loci for plasma and erythrocyte palmitoleic and oleic acid levels in populations of European origin. To identify additional MUFA-associated loci and the potential functional variant at each locus, we performed ethnic-specific GWAS meta-analyses and trans-ethnic meta-analyses in more than 15,000 participants of Chinese and European ancestry. We identified novel genome-wide significant associations for vaccenic acid at FADS1/2 and PKD2L1 [log10(Bayes factor) ≥ 8.07] and for gondoic acid at FADS1/2 and GCKR [log10(Bayes factor) ≥ 6.22], and also observed improved fine-mapping resolutions at FADS1/2 and GCKR loci. The greatest improvement was observed at GCKR, where the number of variants in the 99% credible set was reduced from 16 (covering 94.8 kb) to 5 (covering 19.6 kb, including a missense variant rs1260326) after trans-ethnic meta-analysis. We also confirmed the previously reported associations of PKD2L1, FADS1/2, GCKR, and HIF1AN with palmitoleic acid and of FADS1/2 and LPCAT3 with oleic acid in the Chinese-specific GWAS and the trans-ethnic meta-analyses. Pathway-based analyses suggested that the identified loci were in unsaturated FA metabolism and signaling pathways. Our findings provide novel insight into the genetic basis relevant to MUFA metabolism and biology.
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Affiliation(s)
- Yao Hu
- The Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of the Chinese Academy of Sciences, Shanghai, People's Republic of China
| | - Toshiko Tanaka
- Translational Gerontology Branch, National Institute on Aging, Baltimore, MD
| | - Jingwen Zhu
- The Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of the Chinese Academy of Sciences, Shanghai, People's Republic of China
| | - Weihua Guan
- Division of Biostatistics University of Minnesota, Minneapolis, MN
| | - Jason H Y Wu
- George Institute for Global Health, Sydney Medical School, University of Sydney, Sydney, New South Wales, Australia
| | - Bruce M Psaty
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
- Group Health Research Institute, Group Health Cooperative, Seattle, WA
| | - Barbara McKnight
- Department of Biostatistics, University of Washington, Seattle, WA
| | - Irena B King
- Department of Internal Medicine, University of New Mexico, Albuquerque, NM
| | - Qi Sun
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
- Department of Nutrition, Harvard T. H. Chan School of Public Health, Harvard University, Cambridge, MA
| | - Melissa Richard
- Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, TX
| | - Ani Manichaikul
- Center for Public Health Genomics, University of Virginia, Charlottesville, VA
- Biostatistics Section, Department of Public Health Sciences, University of Virginia, Charlottesville, VA
| | - Alexis C Frazier-Wood
- USDA Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX
| | - Edmond K Kabagambe
- Division of Epidemiology, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN
| | - Paul N Hopkins
- Department of Internal Medicine, University of Utah, Salt Lake City, UT
| | - Jose M Ordovas
- Nutrition and Genomics Laboratory, Jean Mayer-USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA
- Department of Epidemiology and Population Genetics, National Center for Cardiovascular Investigation, Madrid, Spain
| | - Luigi Ferrucci
- Translational Gerontology Branch, National Institute on Aging, Baltimore, MD
| | | | - Donna K Arnett
- Department of Epidemiology, University of Alabama at Birmingham, Birmingham, AL
| | - Yii-Der I Chen
- Institute for Translational Genomics and Population Sciences, Los Angeles BioMedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA
| | - Shuang Liang
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN
| | - David S Siscovick
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
- Department of Epidemiology, School of Public Health, University of Washington, Seattle, WA
- New York Academy of Medicine, New York, NY
| | - Michael Y Tsai
- Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN
| | - Stephen S Rich
- Center for Public Health Genomics, University of Virginia, Charlottesville, VA
| | - Myriam Fornage
- Institute of Molecular Medicine, University of Texas Health Science Center at Houston, Houston, TX
| | - Frank B Hu
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
- Department of Nutrition, Harvard T. H. Chan School of Public Health, Harvard University, Cambridge, MA
| | - Eric B Rimm
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
- Department of Nutrition, Harvard T. H. Chan School of Public Health, Harvard University, Cambridge, MA
| | - Majken K Jensen
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA
- Department of Nutrition, Harvard T. H. Chan School of Public Health, Harvard University, Cambridge, MA
| | - Rozenn N Lemaitre
- Cardiovascular Health Research Unit, Department of Medicine, University of Washington, Seattle, WA
| | - Dariush Mozaffarian
- Friedman School of Nutrition Science and Policy, Tufts University, Boston, MA
| | - Lyn M Steffen
- Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, Minneapolis, MN
| | - Andrew P Morris
- Genetic and Genomic Epidemiology Unit, Wellcome Trust Centre for Human Genetics, Oxford, United Kingdom
| | - Huaixing Li
- The Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of the Chinese Academy of Sciences, Shanghai, People's Republic of China
| | - Xu Lin
- The Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of the Chinese Academy of Sciences, Shanghai, People's Republic of China
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17
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Quinlivan VH, Wilson MH, Ruzicka J, Farber SA. An HPLC-CAD/fluorescence lipidomics platform using fluorescent fatty acids as metabolic tracers. J Lipid Res 2017; 58:1008-1020. [PMID: 28280113 DOI: 10.1194/jlr.d072918] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Revised: 03/07/2017] [Indexed: 11/20/2022] Open
Abstract
Fluorescent lipids are important tools for live imaging in cell culture and animal models, yet their metabolism has not been well-characterized. Here we describe a novel combined HPLC and LC-MS/MS method developed to characterize both total lipid profiles and the products of fluorescently labeled lipids. Using this approach, we found that lipids labeled with the fluorescent tags, 4,4-difluoro-5,7-dimethyl-4-bora-3a,4a-diaza-s-indacene (BODIPY FL), 4,4-difluoro-5-(2-thienyl)-4-bora-3a,4a-diaza-s-indacene [BODIPY(558/568)], and dipyrrometheneboron difluoride undecanoic acid (TopFluor) are all metabolized into varying arrays of polar and nonpolar fluorescent lipid products when they are fed to larval zebrafish. Quantitative metabolic labeling experiments performed in this system revealed significant effects of total dietary lipid composition on fluorescent lipid partitioning. We provide evidence that cholesterol metabolism in the intestine is important in determining the metabolic fates of dietary FAs. Using this method, we found that inhibitors of dietary cholesterol absorption and esterification both decreased incorporation of dietary fluorescent FAs into cholesterol esters (CEs), suggesting that CE synthesis in enterocytes is primarily responsive to the availability of dietary cholesterol. These results are the first to comprehensively characterize fluorescent FA metabolism and to demonstrate their utility as metabolic labeling reagents, effectively coupling quantitative biochemistry with live imaging studies.
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Affiliation(s)
- Vanessa H Quinlivan
- Department of Embryology, Carnegie Institution for Science, Baltimore, MD 21218.,Department of Biology, Johns Hopkins University, Baltimore, MD 21218; and
| | - Meredith H Wilson
- Department of Embryology, Carnegie Institution for Science, Baltimore, MD 21218
| | | | - Steven A Farber
- Department of Embryology, Carnegie Institution for Science, Baltimore, MD 21218; .,Department of Biology, Johns Hopkins University, Baltimore, MD 21218; and
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18
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Klett EL, Chen S, Yechoor A, Lih FB, Coleman RA. Long-chain acyl-CoA synthetase isoforms differ in preferences for eicosanoid species and long-chain fatty acids. J Lipid Res 2017; 58:884-894. [PMID: 28209804 DOI: 10.1194/jlr.m072512] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Revised: 02/16/2017] [Indexed: 01/24/2023] Open
Abstract
Because the signaling eicosanoids, epoxyeicosatrienoic acids (EETs) and HETEs, are esterified to membrane phospholipids, we asked which long-chain acyl-CoA synthetase (ACSL) isoforms would activate these molecules and whether the apparent FA substrate preferences of each ACSL isoform might differ depending on whether it was assayed in mammalian cell membranes or as a purified bacterial recombinant protein. We found that all five ACSL isoforms were able to use EETs and HETEs as substrates and showed by LC-MS/MS that ACSLs produce EET-CoAs. We found differences in substrate preference between ACS assays performed in COS7 cell membranes and recombinant purified proteins. Similarly, preferences and Michaelis-Menten kinetics for long-chain FAs were distinctive. Substrate preferences identified for the purified ACSLs did not correspond to those observed in ACSL-deficient mouse models. Taken together, these data support the concept that each ACSL isoform exhibits a distinct substrate preference, but apparent substrate specificities depend upon multiple factors including membrane character, coactivators, inhibitors, protein interactions, and posttranslational modification.
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Affiliation(s)
- Eric L Klett
- Department of Medicine, Division of Endocrinology, University of North Carolina School of Medicine, Chapel Hill, NC 27599 .,Department of Nutrition, University of North Carolina School of Public Health, Chapel Hill, NC 27599
| | - Shufen Chen
- Department of Medicine, Division of Endocrinology, University of North Carolina School of Medicine, Chapel Hill, NC 27599.,Department of Nutrition, University of North Carolina School of Public Health, Chapel Hill, NC 27599
| | - Alekhya Yechoor
- Department of Nutrition, University of North Carolina School of Public Health, Chapel Hill, NC 27599
| | - Fred B Lih
- Division of Intramural Research, Epigenetics and Stem Cell Biology Laboratory (ESCBL), National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709
| | - Rosalind A Coleman
- Department of Nutrition, University of North Carolina School of Public Health, Chapel Hill, NC 27599
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19
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Irshad Z, Dimitri F, Christian M, Zammit VA. Diacylglycerol acyltransferase 2 links glucose utilization to fatty acid oxidation in the brown adipocytes. J Lipid Res 2017; 58:15-30. [PMID: 27836993 PMCID: PMC5234708 DOI: 10.1194/jlr.m068197] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2016] [Revised: 10/18/2016] [Indexed: 01/03/2023] Open
Abstract
Brown adipose tissue uptake of glucose and fatty acids is very high during nonshivering thermogenesis. Adrenergic stimulation markedly increases glucose uptake, de novo lipogenesis, and FA oxidation simultaneously. The mechanism that enables this concerted response has hitherto been unknown. Here, we find that in primary brown adipocytes and brown adipocyte-derived cell line (IMBAT-1), acute inhibition and longer-term knockdown of DGAT2 links the increased de novo synthesis of fatty acids from glucose to a pool of TAG that is simultaneously hydrolyzed, providing FA for mitochondrial oxidation. DGAT1 does not contribute to this pathway, but uses exogenous FA and glycerol to synthesize a functionally distinct pool of TAG to which DGAT2 also contributes. The DGAT2-dependent channelling of 14C from glucose into TAG and CO2 was reproduced in β3-agonist-stimulated primary brown adipocytes. Knockdown of DGAT2 in IMBAT-1 affected the mRNA levels of UCP1 and genes important in FA activation and esterification. Therefore, in β3-agonist activated brown adipocytes, DGAT2 specifically enables channelling of de novo synthesized FA into a rapidly mobilized pool of TAG, which is simultaneously hydrolyzed to provide substrates for mitochondrial fatty acid oxidation.
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Affiliation(s)
- Zehra Irshad
- Translational and Experimental Medicine, Division of Biomedical Sciences, Warwick Medical School, CV4 7AL, United Kingdom
| | - Federica Dimitri
- Translational and Experimental Medicine, Division of Biomedical Sciences, Warwick Medical School, CV4 7AL, United Kingdom
| | - Mark Christian
- Translational and Experimental Medicine, Division of Biomedical Sciences, Warwick Medical School, CV4 7AL, United Kingdom
| | - Victor A Zammit
- Translational and Experimental Medicine, Division of Biomedical Sciences, Warwick Medical School, CV4 7AL, United Kingdom
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20
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Cruz-Hernandez C, Destaillats F, Thakkar SK, Goulet L, Wynn E, Grathwohl D, Roessle C, de Giorgi S, Tappy L, Giuffrida F, Giusti V. Monoacylglycerol-enriched oil increases EPA/DHA delivery to circulatory system in humans with induced lipid malabsorption conditions. J Lipid Res 2016; 57:2208-2216. [PMID: 27707818 DOI: 10.1194/jlr.p070144] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 10/05/2016] [Indexed: 12/21/2022] Open
Abstract
It was hypothesized that under induced lipid malabsorption/maldigestion conditions, an enriched sn-1(3)-monoacylglycerol (MAG) oil may be a better carrier for n-3 long-chain PUFAs (LC-PUFAs) compared with triacylglycerol (TAG) from fish oil. This monocentric double blinded clinical trial examined the accretion of EPA (500 mg/day) and DHA (300 mg/day) when consumed as TAG or MAG, into the erythrocytes, plasma, and chylomicrons of 45 obese (BMI ≥30 kg/m2 and ≤40 kg/m2) volunteers who were and were not administered Orlistat, an inhibitor of pancreatic lipases. Intake of MAG-enriched oil resulted in higher accretion of LC-PUFAs than with TAG, the concentrations of EPA and DHA in erythrocytes being, respectively, 72 and 24% higher at 21 days (P < 0.001). In addition, MAG increased the plasma concentration of EPA by 56% (P < 0.001) as compared with TAG. In chylomicrons, MAG intake yielded higher levels of EPA with the area under the curve (0-10 h) of EPA being 55% greater (P = 0.012). In conclusion, in obese human subjects with Orlistat-induced lipid maldigestion/malabsorption conditions, LC-PUFA MAG oil increased LC-PUFA levels in erythrocytes, plasma, and chylomicrons to a greater extent than TAG. These results indicate that MAG oil might require minimal enzymatic digestion prior to intestinal uptake and transfer across the epithelial barrier.
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Affiliation(s)
| | | | | | | | - Emma Wynn
- Nestlé Research Center, 1000 Lausanne, Switzerland
| | | | | | - Sara de Giorgi
- Department of Physiology, Faculty of Biology and Medicine, 1005 Lausanne, Switzerland
| | - Luc Tappy
- Department of Physiology, Faculty of Biology and Medicine, 1005 Lausanne, Switzerland
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21
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Jessen N, Nielsen TS, Vendelbo MH, Viggers R, Støen OG, Evans A, Frøbert O. Pronounced expression of the lipolytic inhibitor G0/G1 Switch Gene 2 (G0S2) in adipose tissue from brown bears (Ursus arctos) prior to hibernation. Physiol Rep 2016; 4:4/8/e12781. [PMID: 27117803 PMCID: PMC4848729 DOI: 10.14814/phy2.12781] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [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: 03/18/2016] [Accepted: 03/24/2016] [Indexed: 12/03/2022] Open
Abstract
Prior to hibernation, the brown bear (Ursus arctos) exhibits unparalleled weight gain. Unlike humans, weight gain in bears is associated with lower levels of circulating free fatty acids (FFA) and increased insulin sensitivity. Understanding how free‐ranging brown bears suppress lipolysis when gaining weight may therefore provide novel insight toward the development of human therapies. Blood and subcutaneous adipose tissue were collected from immobilized free‐ranging brown bears (fitted with GPS‐collars) during hibernation in winter and from the same bears during the active period in summer in Dalarna, Sweden. The expression of lipid droplet‐associated proteins in adipose tissue was examined under the hypothesis that bears suppress lipolysis during summer while gaining weight by increased expression of negative regulators of lipolysis. Adipose triglyceride lipase (ATGL) expression did not differ between seasons, but in contrast, the expression of ATGL coactivator Comparative gene identification‐58 (CGI‐58) was lower in summer. In addition, the expression of the negative regulators of lipolysis, G0S2 and cell‐death inducing DNA fragmentation factor‐a‐like effector (CIDE)C markedly increased during summer. Free‐ranging brown bears display potent upregulation of inhibitors of lipolysis in adipose tissue during summer. This is a potential mechanism for increased insulin sensitivity during weight gain and G0S2 may serve as a target to modulate insulin sensitivity.
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Affiliation(s)
- Niels Jessen
- Research Laboratory for Biochemical Pathology, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Thomas S Nielsen
- The Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - Mikkel H Vendelbo
- Department of Nuclear Medicine and PET Center, Aarhus University Hospital, Aarhus, Denmark
| | - Rikke Viggers
- Research Laboratory for Biochemical Pathology, Institute for Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Ole-Gunnar Støen
- Department of Ecology and Natural Resource Management, Norwegian University of Life Sciences, Aas, Norway
| | - Alina Evans
- Department of Forestry and Wildlife Management, Faculty of Applied Ecology and Agricultural Sciences, Hedmark University College Campus Evenstad, Koppang, Norway
| | - Ole Frøbert
- Faculty of Health, Department of Cardiology, Örebro University, Örebro, Sweden
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22
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Sun Y, Koh HWL, Choi H, Koh WP, Yuan JM, Newman JW, Su J, Fang J, Ong CN, van Dam RM. Plasma fatty acids, oxylipins, and risk of myocardial infarction: the Singapore Chinese Health Study. J Lipid Res 2016; 57:1300-7. [PMID: 27371261 DOI: 10.1194/jlr.p066423] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2016] [Indexed: 11/20/2022] Open
Abstract
We aimed to examine the prospective association between plasma FAs, oxylipins, and risk of acute myocardial infarction (AMI) in a Singapore Chinese population. A nested case-control study with 744 incident AMI cases and 744 matched controls aged 47-83 years was conducted within the Singapore Chinese Health Study. Nineteen plasma FAs and 12 oxylipins were quantified using MS. These were grouped into 12 FA clusters and 5 oxylipin clusters using hierarchical clustering, and their associations with AMI risk were assessed. Long-chain n-3 FAs [odds ratio (OR) = 0.67 per SD increase, 95% confidence interval (CI): 0.53-0.84, P < 0.001] and stearic acid (OR = 0.65, 95% CI: 0.44-0.97, P = 0.03) were inversely associated with AMI risk, whereas arachidonic acid (AA) was positively associated with AMI risk (OR = 1.25, 95% CI: 1.03-1.52, P = 0.02) in the multivariable model with adjustment for other FAs. Further adjustment for oxylipins did not substantially change these associations. An inverse association was observed between AA-derived oxylipin, thromboxane (TX)B2, and AMI risk (OR = 0.81, 95% CI: 0.71-0.93, P = 0.003). Circulating long-chain n-3 FAs and stearic acid were associated with a lower and AA was associated with a higher AMI risk in this Chinese population. The association between the oxylipin TXB2 and AMI requires further research.
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Affiliation(s)
- Ye Sun
- Saw Swee Hock School of Public Health National University of Singapore and National University Health System, Singapore NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore Departments of Psychological Medicine National University of Singapore and National University Health System, Singapore
| | - Hiromi W L Koh
- Saw Swee Hock School of Public Health National University of Singapore and National University Health System, Singapore
| | - Hyungwon Choi
- Saw Swee Hock School of Public Health National University of Singapore and National University Health System, Singapore
| | - Woon-Puay Koh
- Saw Swee Hock School of Public Health National University of Singapore and National University Health System, Singapore Duke-NUS Graduate Medical School Singapore, Singapore
| | - Jian-Min Yuan
- Division of Cancer Control and Population Sciences, University of Pittsburgh Cancer Institute and Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh PA
| | - John W Newman
- Department of Nutrition, University of California Davis and US Department of Agriculture, Agricultural Research Sservice, Western Human Nutrition Research Center, Davis CA
| | - Jin Su
- Saw Swee Hock School of Public Health National University of Singapore and National University Health System, Singapore
| | - Jinling Fang
- Saw Swee Hock School of Public Health National University of Singapore and National University Health System, Singapore
| | - Choon Nam Ong
- Saw Swee Hock School of Public Health National University of Singapore and National University Health System, Singapore National University of Singapore Environmental Research Institute, National University of Singapore, Singapore
| | - Rob M van Dam
- Saw Swee Hock School of Public Health National University of Singapore and National University Health System, Singapore Medicine, Yong Loo Lin School of Medicine, National University of Singapore and National University Health System, Singapore Department of Nutrition, Harvard T.H. Chan School of Public Health, Boston, MA
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23
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Palanker Musselman L, Fink JL, Baranski TJ. CoA protects against the deleterious effects of caloric overload in Drosophila. J Lipid Res 2016; 57:380-7. [PMID: 26805007 DOI: 10.1194/jlr.m062976] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2015] [Indexed: 01/30/2023] Open
Abstract
We developed a Drosophila model of T2D in which high sugar (HS) feeding leads to insulin resistance. In this model, adipose TG storage is protective against fatty acid toxicity and diabetes. Initial biochemical and gene expression studies suggested that deficiency in CoA might underlie reduced TG synthesis in animals during chronic HS feeding. Focusing on the Drosophila fat body (FB), which is specialized for TG storage and lipolysis, we undertook a series of experiments to test the hypothesis that CoA could protect against the deleterious effects of caloric overload. Quantitative metabolomics revealed a reduction in substrate availability for CoA synthesis in the face of an HS diet. Further reducing CoA synthetic capacity by expressing FB-specific RNAi targeting pantothenate kinase (PK orfumble) or phosphopantothenoylcysteine synthase (PPCS) exacerbated HS-diet-induced accumulation of FFAs. Dietary supplementation with pantothenic acid (vitamin B5, a precursor of CoA) was able to ameliorate HS-diet-induced FFA accumulation and hyperglycemia while increasing TG synthesis. Taken together, our data support a model where free CoA is required to support fatty acid esterification and to protect against the toxicity of HS diets.
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Affiliation(s)
- Laura Palanker Musselman
- Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110
| | - Jill L Fink
- Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110
| | - Thomas J Baranski
- Division of Endocrinology, Metabolism, and Lipid Research, Department of Medicine, Washington University School of Medicine, St. Louis, MO 63110
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24
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Manichaikul A, Wang XQ, Zhao W, Wojczynski MK, Siebenthall K, Stamatoyannopoulos JA, Saleheen D, Borecki IB, Reilly MP, Rich SS, Bornfeldt KE. Genetic association of long-chain acyl-CoA synthetase 1 variants with fasting glucose, diabetes, and subclinical atherosclerosis. J Lipid Res 2015; 57:433-42. [PMID: 26711138 DOI: 10.1194/jlr.m064592] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2015] [Indexed: 12/16/2022] Open
Abstract
Long-chain acyl-CoA synthetase 1 (ACSL1) converts free fatty acids into acyl-CoAs. Mouse studies have revealed that ACSL1 channels acyl-CoAs to β-oxidation, thereby reducing glucose utilization, and is required for diabetes-accelerated atherosclerosis. The role of ACSL1 in humans is unknown. We therefore examined common variants in the human ACSL1 locus by genetic association studies for fasting glucose, diabetes status, and preclinical atherosclerosis by using the MAGIC and DIAGRAM consortia; followed by analyses in participants from the Multi-Ethnic Study of Atherosclerosis, the Penn-T2D consortium, and a meta-analysis of subclinical atherosclerosis in African Americans; and finally, expression quantitative trait locus analysis and identification of DNase I hypersensitive sites (DHS). The results show that three SNPs in ACSL1 (rs7681334, rs735949, and rs4862423) are associated with fasting glucose or diabetes status in these large (>200,000 subjects) data sets. Furthermore, rs4862423 is associated with subclinical atherosclerosis and coincides with a DHS highly accessible in human heart. SNP rs735949 is in strong linkage disequilibrium with rs745805, significantly associated with ACSL1 levels in skin, suggesting tissue-specific regulatory mechanisms. This study provides evidence in humans of ACSL1 SNPs associated with fasting glucose, diabetes, and subclinical atherosclerosis and suggests links among these traits and acyl-CoA synthesis.
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Affiliation(s)
- Ani Manichaikul
- Center for Public Health Genomics University of Virginia, Charlottesville, VA Biostatistics Section, Department of Public Health Sciences, University of Virginia, Charlottesville, VA
| | - Xin-Qun Wang
- Biostatistics Section, Department of Public Health Sciences, University of Virginia, Charlottesville, VA
| | - Wei Zhao
- Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA
| | - Mary K Wojczynski
- Department of Genetics, Washington University School of Medicine, St. Louis, MO
| | - Kyle Siebenthall
- Department of Genome Sciences, University of Washington, Seattle, WA
| | | | - Danish Saleheen
- Department of Medicine UW Diabetes Institute, University of Washington, Seattle, WA Center for Non-Communicable Diseases, Karachi, Pakistan
| | - Ingrid B Borecki
- Department of Genetics, Washington University School of Medicine, St. Louis, MO
| | - Muredach P Reilly
- Department of Medicine, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA The Cardiovascular Institute, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA
| | - Stephen S Rich
- Center for Public Health Genomics University of Virginia, Charlottesville, VA
| | - Karin E Bornfeldt
- Department of Medicine UW Diabetes Institute, University of Washington, Seattle, WA Center for Non-Communicable Diseases, Karachi, Pakistan
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25
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Vaittinen M, Walle P, Kuosmanen E, Männistö V, Käkelä P, Ågren J, Schwab U, Pihlajamäki J. FADS2 genotype regulates delta-6 desaturase activity and inflammation in human adipose tissue. J Lipid Res 2015; 57:56-65. [PMID: 26609056 DOI: 10.1194/jlr.m059113] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Indexed: 12/17/2022] Open
Abstract
Obesity is associated with disturbed lipid metabolism and low-grade inflammation in tissues. The aim of this study was to investigate the association between FA metabolism and adipose tissue (AT) inflammation in the Kuopio Obesity Surgery study. We investigated the association of surgery-induced weight loss and FA desaturase (FADS)1/2 genotypes with serum and AT FA profile and with AT inflammation, measured as interleukin (IL)-1β and NFκB pathway gene expression, in order to find potential gene-environment interactions. We demonstrated an association between serum levels of saturated and polyunsaturated n-6 FAs, and estimated enzyme activities of FADS1/2 genes with IL-1β expression in AT both at baseline and at follow-up. Variation in the FADS1/2 genes associated with IL-1β and NFκB pathway gene expression in SAT after weight reduction, but not at baseline. In addition, the FA composition in subcutaneous and visceral fat correlated with serum FAs, and the associations between serum PUFAs and estimated D6D enzyme activity with AT inflammation were also replicated with corresponding AT FAs and AT inflammation. We conclude that the polymorphism in FADS1/2 genes associates with FA metabolism and AT inflammation, leading to an interaction between weight loss and FADS1/2 genes in the regulation of AT inflammation.
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Affiliation(s)
- Maija Vaittinen
- Institutes of Public Health and Clinical Nutrition University of Eastern Finland, Kuopio, Finland
| | - Paula Walle
- Institutes of Public Health and Clinical Nutrition University of Eastern Finland, Kuopio, Finland
| | - Emmi Kuosmanen
- Institutes of Public Health and Clinical Nutrition University of Eastern Finland, Kuopio, Finland
| | - Ville Männistö
- Departments of Medicine University of Eastern Finland and Kuopio University Hospital, Kuopio, Finland
| | - Pirjo Käkelä
- Surgery, University of Eastern Finland and Kuopio University Hospital, Kuopio, Finland
| | - Jyrki Ågren
- Biomedicine, University of Eastern Finland, Kuopio, Finland
| | - Ursula Schwab
- Institutes of Public Health and Clinical Nutrition University of Eastern Finland, Kuopio, Finland Clinical Nutrition and Obesity Center, Kuopio University Hospital, Kuopio, Finland
| | - Jussi Pihlajamäki
- Institutes of Public Health and Clinical Nutrition University of Eastern Finland, Kuopio, Finland Clinical Nutrition and Obesity Center, Kuopio University Hospital, Kuopio, Finland
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26
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Stauch B, Fisher SJ, Cianci M. Open and closed states of Candida antarctica lipase B: protonation and the mechanism of interfacial activation. J Lipid Res 2015; 56:2348-58. [PMID: 26447231 PMCID: PMC4655990 DOI: 10.1194/jlr.m063388] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [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: 09/01/2015] [Indexed: 11/20/2022] Open
Abstract
Lipases (EC 3.1.1.3) are ubiquitous hydrolases for the carboxyl ester bond of water-insoluble substrates, such as triacylglycerols, phospholipids, and other insoluble substrates, acting in aqueous as well as in low-water media, thus being of considerable physiological significance with high interest also for their industrial applications. The hydrolysis reaction follows a two-step mechanism, or “interfacial activation,” with adsorption of the enzyme to a heterogeneous interface and subsequent enhancement of the lipolytic activity. Among lipases, Candida antarctica lipase B (CALB) has never shown any significant interfacial activation, and a closed conformation of CALB has never been reported, leading to the conclusion that its behavior was due to the absence of a lid regulating the access to the active site. The lid open and closed conformations and their protonation states are observed in the crystal structure of CALB at 0.91 Å resolution. Having the open and closed states at atomic resolution allows relating protonation to the conformation, indicating the role of Asp145 and Lys290 in the conformation alteration. The findings explain the lack of interfacial activation of CALB and offer new elements to elucidate this mechanism, with the consequent implications for the catalytic properties and classification of lipases.
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Affiliation(s)
- Benjamin Stauch
- European Molecular Biology Laboratory-European Bioinformatics Institute (EMBL-EBI), Wellcome Trust Genome Campus, Hinxton, Cambridge CB10 1SD, United Kingdom Robinson College, University of Cambridge, Cambridge CB3 9AN, United Kingdom
| | - Stuart J Fisher
- Diamond Light Source, Didcot, Oxfordshire OX11 0DE, United Kingdom
| | - Michele Cianci
- European Molecular Biology Laboratory (EMBL), Deutsches Elektronen-Synchrotron (DESY), Hamburg 22607, Germany
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27
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O'Neill HM, Lally JS, Galic S, Pulinilkunnil T, Ford RJ, Dyck JRB, van Denderen BJ, Kemp BE, Steinberg GR. Skeletal muscle ACC2 S212 phosphorylation is not required for the control of fatty acid oxidation during exercise. Physiol Rep 2015; 3:3/7/e12444. [PMID: 26156967 PMCID: PMC4552526 DOI: 10.14814/phy2.12444] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
During submaximal exercise fatty acids are a predominant energy source for muscle contractions. An important regulator of fatty acid oxidation is acetyl-CoA carboxylase (ACC), which exists as two isoforms (ACC1 and ACC2) with ACC2 predominating in skeletal muscle. Both ACC isoforms regulate malonyl-CoA production, an allosteric inhibitor of carnitine palmitoyltransferase 1 (CPT-1); the primary enzyme controlling fatty acyl-CoA flux into mitochondria for oxidation. AMP-activated protein kinase (AMPK) is a sensor of cellular energy status that is activated during exercise or by pharmacological agents such as metformin and AICAR. In resting muscle the activation of AMPK with AICAR leads to increased phosphorylation of ACC (S79 on ACC1 and S221 on ACC2), which reduces ACC activity and malonyl-CoA; effects associated with increased fatty acid oxidation. However, whether this pathway is vital for regulating skeletal muscle fatty acid oxidation during conditions of increased metabolic flux such as exercise/muscle contractions remains unknown. To examine this we characterized mice lacking AMPK phosphorylation sites on ACC2 (S212 in mice/S221 in humans-ACC2-knock-in [ACC2-KI]) or both ACC1 (S79) and ACC2 (S212) (ACC double knock-in [ACCD-KI]) during submaximal treadmill exercise and/or ex vivo muscle contractions. We find that surprisingly, ACC2-KI mice had normal exercise capacity and whole-body fatty acid oxidation during treadmill running despite elevated muscle ACC2 activity and malonyl-CoA. Similar results were observed in ACCD-KI mice. Fatty acid oxidation was also maintained in muscles from ACC2-KI mice contracted ex vivo. These findings indicate that pathways independent of ACC phosphorylation are important for regulating skeletal muscle fatty acid oxidation during exercise/muscle contractions.
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Affiliation(s)
- Hayley M O'Neill
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada Department of Medicine, St. Vincent's Institute of Medical Research, University of Melbourne, Fitzroy, Victoria, Australia Faculty of Health Sciences and Medicine, Bond Institute of Health and Sport, Bond University, Robina, Queensland, Australia
| | - James S Lally
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Sandra Galic
- Department of Medicine, St. Vincent's Institute of Medical Research, University of Melbourne, Fitzroy, Victoria, Australia
| | - Thomas Pulinilkunnil
- Department of Pediatrics, Faculty of Medicine and Dentistry, Cardiovascular Research Centre, Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Rebecca J Ford
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada
| | - Jason R B Dyck
- Department of Pediatrics, Faculty of Medicine and Dentistry, Cardiovascular Research Centre, Mazankowski Alberta Heart Institute, University of Alberta, Edmonton, Alberta, Canada
| | - Bryce J van Denderen
- Department of Medicine, St. Vincent's Institute of Medical Research, University of Melbourne, Fitzroy, Victoria, Australia
| | - Bruce E Kemp
- Department of Medicine, St. Vincent's Institute of Medical Research, University of Melbourne, Fitzroy, Victoria, Australia
| | - Gregory R Steinberg
- Division of Endocrinology and Metabolism, Department of Medicine, McMaster University, Hamilton, Ontario, Canada Department of Medicine, St. Vincent's Institute of Medical Research, University of Melbourne, Fitzroy, Victoria, Australia
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28
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Hirata A, Kishino S, Park SB, Takeuchi M, Kitamura N, Ogawa J. A novel unsaturated fatty acid hydratase toward C16 to C22 fatty acids from Lactobacillus acidophilus. J Lipid Res 2015; 56:1340-50. [PMID: 25966711 DOI: 10.1194/jlr.m059444] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2015] [Indexed: 11/20/2022] Open
Abstract
Hydroxy FAs, one of the gut microbial metabolites of PUFAs, have attracted much attention because of their various bioactivities. The purpose of this study was to identify lactic acid bacteria with the ability to convert linoleic acid (LA) to hydroxy FAs. A screening process revealed that a gut bacterium, Lactobacillus acidophilus NTV001, converts LA mainly into 13-hydroxy-cis-9-octadecenoic acid and resulted in the identification of the hydratase responsible, fatty acid hydratase 1 (FA-HY1). Recombinant FA-HY1 was purified, and its enzymatic characteristics were investigated. FA-HY1 could convert not only C18 PUFAs but also C20 and C22 PUFAs. C18 PUFAs with a cis carbon-carbon double bond at the Δ12 position were converted into the corresponding 13-hydroxy FAs. Arachidonic acid and DHA were converted into the corresponding 15-hydroxy FA and 14-hydroxy FA, respectively. To the best of our knowledge, this is the first report of a bacterial FA hydratase that can convert C20 and C22 PUFAs into the corresponding hydroxy FAs. These novel hydroxy FAs produced by using FA-HY1 should contribute to elucidating the bioactivities of hydroxy FAs.
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Affiliation(s)
- Akiko Hirata
- Division of Applied Life Sciences Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Shigenobu Kishino
- Division of Applied Life Sciences Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Si-Bum Park
- Laboratory of Industrial Microbiology, Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Michiki Takeuchi
- Division of Applied Life Sciences Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Nahoko Kitamura
- Division of Applied Life Sciences Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
| | - Jun Ogawa
- Division of Applied Life Sciences Graduate School of Agriculture, Kyoto University, Kyoto 606-8502, Japan
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29
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Shewale SV, Boudyguina E, Zhu X, Shen L, Hutchins PM, Barkley RM, Murphy RC, Parks JS. Botanical oils enriched in n-6 and n-3 FADS2 products are equally effective in preventing atherosclerosis and fatty liver. J Lipid Res 2015; 56:1191-205. [PMID: 25921305 DOI: 10.1194/jlr.m059170] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Indexed: 01/02/2023] Open
Abstract
Echium oil (EO), which is enriched in 18:4 n-3, the immediate product of fatty acid desaturase 2 (FADS2) desaturation of 18:3 n-3, is as atheroprotective as fish oil (FO). The objective of this study was to determine whether botanical oils enriched in the FADS2 products 18:3 n-6 versus 18:4 n-3 are equally atheroprotective. LDL receptor KO mice were fed one of four atherogenic diets containing 0.2% cholesterol and 10% calories as palm oil (PO) plus 10% calories as: 1) PO; 2) borage oil (BO; 18:3 n-6 enriched); 3) EO (18:4 n-3 enriched); or 4) FO for 16 weeks. Mice fed BO, EO, and FO versus PO had significantly lower plasma total and VLDL cholesterol concentrations; hepatic neutral lipid content and inflammation, aortic CE content, aortic root intimal area and macrophage content; and peritoneal macrophage inflammation, CE content, and ex vivo chemotaxis. Atheromas lacked oxidized CEs despite abundant generation of macrophage 12/15 lipooxygenase-derived metabolites. We conclude that botanical oils enriched in 18:3 n-6 and 18:4 n-3 PUFAs beyond the rate-limiting FADS2 enzyme are equally effective in preventing atherosclerosis and hepatosteatosis compared with saturated/monounsaturated fat due to cellular enrichment of ≥20 PUFAs, reduced plasma VLDL, and attenuated macrophage inflammation.
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Affiliation(s)
- Swapnil V Shewale
- Departments of Internal Medicine-Section on Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27157 Physiology/Pharmacology, Wake Forest School of Medicine, Winston-Salem, NC 27157
| | - Elena Boudyguina
- Departments of Internal Medicine-Section on Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27157
| | - Xuewei Zhu
- Departments of Internal Medicine-Section on Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27157
| | - Lulu Shen
- Departments of Internal Medicine-Section on Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27157
| | - Patrick M Hutchins
- Department of Pharmacology, University of Colorado Denver, Aurora, CO 80045
| | - Robert M Barkley
- Department of Pharmacology, University of Colorado Denver, Aurora, CO 80045
| | - Robert C Murphy
- Department of Pharmacology, University of Colorado Denver, Aurora, CO 80045
| | - John S Parks
- Departments of Internal Medicine-Section on Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, NC 27157 Biochemistry, Wake Forest School of Medicine, Winston-Salem, NC 27157
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30
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Burhans MS, Flowers MT, Harrington KR, Bond LM, Guo CA, Anderson RM, Ntambi JM. Hepatic oleate regulates adipose tissue lipogenesis and fatty acid oxidation. J Lipid Res 2015; 56:304-18. [PMID: 25555387 DOI: 10.1194/jlr.m054429] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Hepatic steatosis is associated with detrimental metabolic phenotypes including enhanced risk for diabetes. Stearoyl-CoA desaturases (SCDs) catalyze the synthesis of MUFAs. In mice, genetic ablation of SCDs reduces hepatic de novo lipogenesis (DNL) and protects against diet-induced hepatic steatosis and adiposity. To understand the mechanism by which hepatic MUFA production influences adipose tissue stores, we created two liver-specific transgenic mouse models in the SCD1 knockout that express either human SCD5 or mouse SCD3, that synthesize oleate and palmitoleate, respectively. We demonstrate that hepatic de novo synthesized oleate, but not palmitoleate, stimulate hepatic lipid accumulation and adiposity, reversing the protective effect of the global SCD1 knockout under lipogenic conditions. Unexpectedly, the accumulation of hepatic lipid occurred without induction of the hepatic DNL program. Changes in hepatic lipid composition were reflected in plasma and in adipose tissue. Importantly, endogenously synthesized hepatic oleate was associated with suppressed DNL and fatty acid oxidation in white adipose tissue. Regression analysis revealed a strong correlation between adipose tissue lipid fuel utilization and hepatic and adipose tissue lipid storage. These data suggest an extrahepatic mechanism where endogenous hepatic oleate regulates lipid homeostasis in adipose tissues.
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Affiliation(s)
- Maggie S Burhans
- Departments of Nutritional Sciences, Veterans Administration Medical Center, Madison, WI 53705
| | - Matthew T Flowers
- Biochemistry, Veterans Administration Medical Center, Madison, WI 53705
| | | | - Laura M Bond
- Biochemistry, Veterans Administration Medical Center, Madison, WI 53705
| | - Chang-An Guo
- Biochemistry, Veterans Administration Medical Center, Madison, WI 53705
| | - Rozalyn M Anderson
- Medicine, University of Wisconsin-Madison, Madison, WI 53706 Geriatric Research, Education, and Clinical Center, Veterans Administration Medical Center, Madison, WI 53705
| | - James M Ntambi
- Departments of Nutritional Sciences, Veterans Administration Medical Center, Madison, WI 53705 Biochemistry, Veterans Administration Medical Center, Madison, WI 53705
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31
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Sakurama H, Kishino S, Mihara K, Ando A, Kita K, Takahashi S, Shimizu S, Ogawa J. Biohydrogenation of C20 polyunsaturated fatty acids by anaerobic bacteria. J Lipid Res 2014; 55:1855-63. [PMID: 25002034 DOI: 10.1194/jlr.m045450] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The PUFAs include many bioactive lipids. The microbial metabolism of C18 PUFAs is known to produce their bioactive isomers, such as conjugated FAs and hydroxy FAs, but there is little information on that of C20 PUFAs. In this study, we aimed to obtain anaerobic bacteria with the ability to produce novel PUFAs from C20 PUFAs. Through the screening of ∼100 strains of anaerobic bacteria, Clostridium bifermentans JCM 1386 was selected as a strain with the ability to saturate PUFAs during anaerobic cultivation. This strain converted arachidonic acid (cis-5,cis-8,cis-11,cis-14-eicosatetraenoic acid) and EPA (cis-5,cis-8,cis-11,cis-14,cis-17-EPA) into cis-5,cis-8,trans-13-eicosatrienoic acid and cis-5,cis-8,trans-13,cis-17-eicosatetraenoic acid, giving yields of 57% and 67% against the added PUFAs, respectively. This is the first report of the isolation of a bacterium transforming C20 PUFAs into corresponding non-methylene-interrupted FAs. We further investigated the substrate specificity of the biohydrogenation by this strain and revealed that it can convert two cis double bonds at the ω6 and ω9 positions in various C18 and C20 PUFAs into a trans double bond at the ω7 position. This study should serve to open up the development of novel potentially bioactive PUFAs.
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Affiliation(s)
- Haruko Sakurama
- Laboratory of Industrial Microbiology, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Shigenobu Kishino
- Laboratory of Industrial Microbiology, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan Laboratory of Fermentation Physiology and Applied Microbiology, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Kousuke Mihara
- Laboratory of Fermentation Physiology and Applied Microbiology, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Akinori Ando
- Laboratory of Fermentation Physiology and Applied Microbiology, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan Research Unit for Physiological Chemistry, Kyoto University, Kitashirakawa-oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Keiko Kita
- Laboratory of Molecular Microbiology, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Satomi Takahashi
- Laboratory of Industrial Microbiology, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Sakayu Shimizu
- Laboratory of Fermentation Physiology and Applied Microbiology, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
| | - Jun Ogawa
- Laboratory of Fermentation Physiology and Applied Microbiology, Division of Applied Life Sciences, Graduate School of Agriculture, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan
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