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Cao Y, Wang S, Liu S, Wang Y, Jin H, Ma H, Luo X, Cao Y, Lian Z. Effects of Long-Chain Fatty Acyl-CoA Synthetase 1 on Diglyceride Synthesis and Arachidonic Acid Metabolism in Sheep Adipocytes. Int J Mol Sci 2020; 21:E2044. [PMID: 32192050 PMCID: PMC7139739 DOI: 10.3390/ijms21062044] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 03/11/2020] [Accepted: 03/14/2020] [Indexed: 12/25/2022] Open
Abstract
Long-chain fatty acyl-CoA synthetase (ACSLs) is an essential enzyme for the synthesis of fatty acyl-CoA. ACSL1 plays a key role in the synthesis of triglycerides, phospholipids, and cholesterol esters. BACKGROUND In the current study, triglyceride content did not increase after overexpression of the ACSL1 gene. METHODS RNA-seq and lipid metabolome profiling were performed to determine why triglyceride levels did not change with ACSL1 overexpression. RESULTS Fatty acyl-CoA produced by ACSL1 was determined to be involved in the diglyceride synthesis pathway, and diglyceride content significantly increased when ACSL1 was overexpressed. Moreover, the arachidonic acid (AA) content in sheep adipocytes significantly increased, and the level of cyclooxygenase 2 (COX2) expression, the downstream metabolic gene, was significantly downregulated. Knocking down the ACSL1 gene was associated with an increase in COX2 mRNA expression, as well as an increase in prostaglandin content, which is the downstream metabolite of AA. CONCLUSIONS The overexpression of the ACSL1 gene promotes the production of AA via downregulation of COX2 gene expression.
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Affiliation(s)
- Yang Cao
- Beijing Key Laboratory for Animal Genetic Improvement, National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China; (Y.C.); (S.L.)
- Branch of Animal Husbandry, Jilin Academy of Agricultural Science, Gongzhuling 136100, China; (Y.W.); (H.J.); (H.M.); (X.L.)
| | - Sutian Wang
- State Key Laboratory of Livestock and Poultry Breeding, Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China;
| | - Shunqi Liu
- Beijing Key Laboratory for Animal Genetic Improvement, National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China; (Y.C.); (S.L.)
| | - Yanli Wang
- Branch of Animal Husbandry, Jilin Academy of Agricultural Science, Gongzhuling 136100, China; (Y.W.); (H.J.); (H.M.); (X.L.)
| | - Haiguo Jin
- Branch of Animal Husbandry, Jilin Academy of Agricultural Science, Gongzhuling 136100, China; (Y.W.); (H.J.); (H.M.); (X.L.)
| | - Huihai Ma
- Branch of Animal Husbandry, Jilin Academy of Agricultural Science, Gongzhuling 136100, China; (Y.W.); (H.J.); (H.M.); (X.L.)
| | - Xiaotong Luo
- Branch of Animal Husbandry, Jilin Academy of Agricultural Science, Gongzhuling 136100, China; (Y.W.); (H.J.); (H.M.); (X.L.)
| | - Yang Cao
- Branch of Animal Husbandry, Jilin Academy of Agricultural Science, Gongzhuling 136100, China; (Y.W.); (H.J.); (H.M.); (X.L.)
| | - Zhengxing Lian
- Beijing Key Laboratory for Animal Genetic Improvement, National Engineering Laboratory for Animal Breeding, Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing 100193, China; (Y.C.); (S.L.)
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Knapp S, Wurtman RJ. Enhancement of free fatty acid incorporation into phospholipids by choline plus cytidine. Brain Res 1999; 822:52-9. [PMID: 10082883 DOI: 10.1016/s0006-8993(99)01072-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Cytidine and choline, present in cytidine 5'-diphosphate choline (CDP-choline), are major precursors of the phosphatidylcholine found in cell membranes and important regulatory elements in phosphatide biosynthesis. Administration of CDP-choline to rats increases blood and brain cytidine and choline levels; this enhances the production of endogenous CDP-choline which then combines with fatty acids (as diacylglycerol), to yield phosphatidylcholine. We examined the effect of providing cytidine and choline on incorporation of free fatty acids into phosphatidylcholine and other major phospholipids in PC12 cells. Addition of equimolar cytidine and choline (100-500 microM) to [3H]-arachidonic acid (50 microM, 0.2 microCi, bound to bovine serum albumin) dose-dependently increased the accumulations of [3H]-phosphatidylcholine (PtdCho), [3H]-phosphatidylinositol (PtdIno) and [3H]-phosphatidylethanolamine (PtdEtn) (by up to 27+/-3%, 16+/-3% and 11+/-3%, respectively, means+/-S.E.M.). This effect was seen with 8-18 h of incubation. The incorporation of [3H]-oleic acid into [3H]-PtdCho was even more enhanced (by up to 42+/-3%) as were the incorporations of [14C]-choline and [3H]-glycerol. The effects of choline and cytidine were enhanced by 12-O-tetradecanoylphorbol-13-acetate (TPA, 1 microM), which activates CTP:phosphocholine cytidylyltransferase (CT) and facilitates choline uptake. Replacing choline by ethanolamine also enhanced the incorporation of [3H]-arachidonic acid into [3H]-PtdEtn, [3H]-PtdIno and [3H]-PtdCho. Arachidonic acid (10-200 microM) alone failed to affect the incorporation of [14C]-choline into phosphatidylcholine. We suggest that the increases in phospholipid synthesis caused by concurrent cytidine and choline supplementation enhance the incorporation of arachidonic acid and certain other fatty acids into the major glycerophospholipids. Removing these fatty acids as source of potentially toxic oxidation products could contribute to the beneficial effects of CDP-choline in treating stroke or other brain damage.
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Affiliation(s)
- S Knapp
- Massachusetts Institute of Technology, Department of Brain and Cognitive Sciences, E25-604, Cambridge, MA 02139, USA
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Ide H, Miller JC, Weinhold PA. Ethanolaminephosphotransferase in rat lung: selectivity for endogenous and exogenous diacylglycerol. BIOCHIMICA ET BIOPHYSICA ACTA 1988; 960:119-24. [PMID: 2833930 DOI: 10.1016/0005-2760(88)90017-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Ethanolaminephosphotransferase (EC 2.7.8.1) activity was determined in lung microsomes using diacylglycerols generated endogenously from [14C]glycerol 3-phosphate and different mixtures of fatty acids. Ethanolaminephosphotransferase used endogenously generated dipalmitoylglycerol better than dioleoylglycerol. The apparent Km and the reaction rates for four different endogenously generated mixtures were the same (16 nmol/mg microsomal proteins). The apparent Km values for CDP-ethanolamine were the same (0.26 mm) for endogenously generated dipalmitoylglycerol and dioleoylglycerol. The amount of diacylglycerol generated in microsomes was 2-3-times the apparent Km for diacylglycerol. Dipalmitoylglycerol, supplied exogenously as a Tween 20/phosphatidylglycerol emulsion, was nearly twice as active as dioleoylglycerol. Both dipalmitoylglycerol and dioleoylglycerol were more active as substrates when emulsions were made with phosphatidylglycerol/Tween 20 than with Tween 20 alone. The results suggest that ethanolaminephosphotransferase in lung is relatively nonselective for molecular species of diacylglycerol. In addition, the results suggest that the concentration of diacylglycerol and the physical state in which it is presented to the enzyme can affect the apparent selectivity of ethanolaminephosphotransferase for diacylglycerols.
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Affiliation(s)
- H Ide
- Veterans Administration Medical Centre, Ann Arbor, MI
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Justin A, Demandre C, Trémolières A, Mazliak P. No discrimination by choline- and ethanolamine phosphotransferases from potato tuber microsomes in molecular species of endogenous diacylglycerols. ACTA ACUST UNITED AC 1985. [DOI: 10.1016/0005-2760(85)90212-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Brooksbank BW, Martinez M, Balazs R. Altered composition of polyunsaturated fatty acyl groups in phosphoglycerides of Down's syndrome fetal brain. J Neurochem 1985; 44:869-74. [PMID: 3156210 DOI: 10.1111/j.1471-4159.1985.tb12896.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We have observed recently that in vitro lipoperoxidation is enhanced in Down's syndrome brain homogenates of prenatal age. As this may relate to the composition of polyunsaturated acyl groups (PUFA) in phospholipids, we have examined the PUFA of ethanolamine and serine phosphoglycerides (EPG and SPG), which are particularly rich in PUFA, in the same series of cerebral cortex specimens of Down's syndrome and age-matched control fetuses. Although the total percentages of PUFA in the two phosphoglycerides were not altered, compared with controls the ratio of PUFA of the (n-3) series to those of the (n-6) series was very significantly elevated in Down's syndrome, from 0.32 to 0.55 in EPG and from 0.60 to 0.97 in SPG. In particular, docosahexaenoyl, 22:6(n-3), groups were uniformly increased in Down's syndrome compared with controls by 54% and 33% in EPG and SPG, respectively, while arachidonoyl, 20:4(n-6), groups were decreased by 16% and 30%, respectively. Similar changes occur during normal development, but the (n-3) to (n-6) ratio of PUFA in these phosphoglycerides of Down's syndrome at the fifth month of gestation resembled that of normal human cerebral grey matter at term. However, other developmental indices related to PUFA composition were not significantly affected. It seems therefore that in the developing Down's syndrome brain there may be a distortion of the normal transformations of essential fatty acids and of their incorporation into phosphoglycerides. The disproportion between docosahexaenoyl and arachidonoyl groups in membrane phosphoglycerides during prenatal development in Down's syndrome may also result in disturbances of the proper functioning, and the ontogenetic integration, of membrane enzymes and transport processes.
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Rüstow B, Kunze D. The availability of endogenous and exogenous disaturated diacylglycerol for the diacylglycerol-consuming reactions in lung microsomes. BIOCHIMICA ET BIOPHYSICA ACTA 1984; 796:359-63. [PMID: 6509083 DOI: 10.1016/0005-2760(84)90138-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Lung tissue is characterized by its high level of dipalmitoylphosphatidylcholine, which can be synthesized by lung microsomes with endogenous and exogenous 1,2-dipalmitoylglycerol as the substrate. This endogenous substrate species was also available for the triacylglycerol synthesis but not for the de novo synthesis of phosphatidylethanolamine. From exogenous disaturated diacylglycerol the corresponding species of phosphatidylcholine, triacylglycerol and also phosphatidylethanolamine were formed. These results support the thesis that endogenous disaturated diacylglycerol is not available for all diacylglycerol-consuming reactions.
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Bazan HE, Sprecher H, Bazan NG. De novo biosynthesis of docosahexaenoyl-phosphatidic acid in bovine retinal microsomes. BIOCHIMICA ET BIOPHYSICA ACTA 1984; 796:11-9. [PMID: 6091768 DOI: 10.1016/0005-2760(84)90232-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Lysophosphatidic acid stimulated several-fold the formation of docosahexaenoyl-phosphatidic acid from 14C-labeled docosahexaenoic acid (22:6 (n-3] in the bovine retina. 1-Palmitoyl- and 1-oleoyl-sn-glycerol 3-phosphate were the preferred acceptors. Most of the activity was localized in the 105 000 X g microsomal fraction. Despite the very high content of 22:6 in the phospholipids of photoreceptor membranes, only about 1% of the microsomal activity was found in discs isolated from rod outer segments. The newly synthesized docosahexaenoyl-phosphatidic acid was further metabolized to diacylglycerols, triacylglycerols, phosphatidylcholine and phosphatidylserine. The de novo synthesis of docosahexaenoyl-phosphatidylcholine was stimulated by 1 mM CDPcholine. Lysophosphatidic acid and lysophosphatidylcholine up to 50 microM do not compete with each other for 22:6 in the formation of their respective diacylated lipids. This suggests that this fatty acid is introduced into phosphatidic acid and phosphatidylcholine via different acylation systems. We conclude that, in addition to the deacylation-acylation cycle, there is also an active pathway for the acylation of 22:6 into glycerolipids during the de novo biosynthesis of phosphatidic acid.
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Utilization of diacylglycerol in phospholipid bilayers by pig brain diacylglycerol kinase and Rhizopus arrhizus lipase. J Biol Chem 1984. [DOI: 10.1016/s0021-9258(18)90846-x] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Kunze D, Rüstow B, Rabe H, Ullrich KP. Diacylglycerol species in microsomes and mitochondria of normal and dystrophic human muscle. Clin Chim Acta 1984; 140:215-22. [PMID: 6467611 DOI: 10.1016/0009-8981(84)90202-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The concentration of 1.2-diacylglycerol in mitochondria and microsomes of normal human muscle was estimated to be 1.7 +/- 0.6 and 9.2 +/- 1.9 nmol X mg protein-1, respectively. The molecular species profile of 1.2-diacylglycerol was obtained using high pressure liquid chromatography which yielded 14 fractions. Corresponding studies were carried out for normal and dystrophic muscle. No significant difference could be seen between the 1.2-diacylglycerol patterns in normal muscle mitochondria and in microsomes. There was a radical shift in the 1.2-diacylglycerol pattern in both dystrophic organelles, mainly with a decrease in 16:0/16:0 species. In dystrophic mitochondria the total level of 1.2-diacylglycerol was higher.
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Pelech SL, Vance DE. Regulation of phosphatidylcholine biosynthesis. BIOCHIMICA ET BIOPHYSICA ACTA 1984; 779:217-51. [PMID: 6329299 DOI: 10.1016/0304-4157(84)90010-8] [Citation(s) in RCA: 341] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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11
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Krüger J, Rabe H, Reichmann G, Rüstow B. Separation and determination of diacylglycerols as their naphthylurethanes by high-performance liquid chromatography. JOURNAL OF CHROMATOGRAPHY 1984; 307:387-92. [PMID: 6736185 DOI: 10.1016/s0378-4347(00)84110-9] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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12
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Goracci G, Francescangeli E, Horrocks LA, Porcellati G. The effect of CMP on the release of free fatty acids of rat brain in vitro. Neurochem Res 1983; 8:971-81. [PMID: 6312352 DOI: 10.1007/bf00965194] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
With CMP, phosphatidylcholine can be converted to diacylglycerols and CDPcholine by reversal of the cholinephosphotransferase that is normally used for synthesis. Incubation of homogenates of rat brains at pH 8 with 20 mM MgCl2 increased the free fatty acid (FFA) levels 30 to 117%. The FFA levels increased 62 to 212% when 4 mM CMP was included. Diacylglycerols were also produced. Hydrolysis of the diacylglycerols to FFA was markedly inhibited by inclusion of 3 mM diisopropylphosphofluoridate in the incubation mixture. The composition of the fatty acids released by CMP resembles that of phosphatidylcholine except for some polyunsaturated fatty acids. These may have been released from the ethanolamine glycerophospholipids. Most of the CMP-stimulated release of FFA was blocked by inclusion of 1 mM CDPcholine in the incubation mixture. Rat brains were labeled by intracerebral injection of [3H]oleic acid. The labeled oleic acid was released primarily from phosphatidylcholine. Thus, measurements of both mass and radioactivity confirm that the reversal of cholinephosphotransferase followed by diacylglycerol lipase can be an important pathway for the liberation of FFA from phosphatidylcholine.
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Cook HW, Clarke JT, Spence MW. Involvement of triacylglycerol in the metabolism of fatty acids by cultured neuroblastoma and glioma cells. J Lipid Res 1982. [DOI: 10.1016/s0022-2275(20)38034-2] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Bazan HE, Careaga MM, Sprecher H, Bazan NG. Chain elongation and desaturation of eicosapentaenoate to docosahexaenoate and phospholipid labeling in the rat retina in vivo. BIOCHIMICA ET BIOPHYSICA ACTA 1982; 712:123-8. [PMID: 6288109 DOI: 10.1016/0005-2760(82)90093-5] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The metabolism of [1-14C]eicosapentaenoic acid in the retina after intravitreal injections in the adult rat eye was studied. The acylation of eicosapentaenoic acid and the appearance of labeled docosapentaenoate and docosahexaenoate in individual phospholipids was observed at 3, 5 and 30 min after injection. The elongation and desaturation products represented about 8 and 4%, respectively, of the total radioactivity of phospholipids 3 min after injection. The highest labeling was found in phosphatidylcholine, phosphatidylinositol and phosphatidic acid. The uneven labeling profiles and the specific activities in individual phospholipids suggested that, in addition to the deacylation-acylation route for the introduction of polyenoic acyl groups into phospholipids, acylation may also take place during the synthesis of phosphatidic acid, followed by channeling to phospholipids.
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Trovarelli G, de Medio GE, Dorman RV, Piccinin GL, Horrocks LA, Porcellati G. Effect of cytidine diphosphate choline (CDP-choline) on ischemia-induced alterations of brain lipid in the gerbil. Neurochem Res 1981; 6:821-33. [PMID: 6796897 DOI: 10.1007/bf00965041] [Citation(s) in RCA: 78] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Brain ischemia was produced in gerbils (Meriones unguiculatus) by the bilateral ligation of the carotid arteries. Definite changes in the energy status of brain demonstrated that carotid occlusion was effective. Five minutes before ligation, an intraventricular injection of either saline or cytidine disphosphate choline (CDP-choline, 0.6 micromol/brain, 3 microliter) was given to groups of animals. Control animals, with and without CDP-choline, together with the ischemic groups, were decapitated directly into liquid nitrogen; 10 min after arterial ligation. Brain free fatty acids, neutral lipids and phospholipids, which were labeled in vivo by the intraventricular injection of [1-14C]arachidonic acid (0.4-0.6 micro Ci, 6-9 nmol) 2 hr prior to ligation, were extracted, purified, and separated by thin-layer chromatographic procedures. The CDP-choline treatment noticeably corrected the increase of total and individual fatty acids due to ischemia and the increase of their radioactivity content. The changes in neutral lipids, particularly in the diacyl glycerol fraction, were also corrected by the injection of the nucleotide. CDP-choline partially reversed the decreased of brain phosphatidylcholine and of its labeling, which was due to ischemia. All the data indicate that the prior injection of CDP-choline stimulates the choline phosphotransferase reaction of brain towards synthesis of phosphatidylcholine and prevents the release of free fatty acids, particularly of arachidonic acid, associated with ischemia.
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