Intramitochondrial fatty acid metabolism: riboflavin deficiency and energy production

1991 ◽  
Vol 69 (7) ◽  
pp. 490-497 ◽  
Author(s):  
H. G. Parsons ◽  
V. C. Dias
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Metabolism ◽  
Acid Metabolism ◽  
Newborn Infants ◽  
Fatty Acyl ◽  
Acid Oxidation ◽  
Medium Chain Triglycerides ◽  
Riboflavin Deficiency ◽  
Inborn Errors ◽  
Medium Chain

Inborn errors of fatty acid β-oxidation have contributed significantly to our understanding of intracellular fatty acid metabolism. The first intramitochondrial step in β-oxidation of fatty acyl-CoA of different chain lengths is catalyzed by the three chain length specific acyl-CoA dehydrogenases. Inherited deficiency of these enzymes has been reported. Some are riboflavin responsive. The first step of fatty acid oxidation is reviewed with specific emphasis on β-oxidation in newborn infants, rendered riboflavin deficient by phototherapy. Given that medium chain fatty acids are not stored as triacylglycerols and undergo rapid β-oxidation, they have been proposed as superior substrates compared with long chain triglycerides in times of metabolic stress. This review also examines medium chain triglycerides as an alternate energy source. When medium chain triglycerides were fed as 50% of total energy, glucose sparing was present with little loss of energy as dicarboxylic acids.Key words: β-oxidation, acyl-CoA dehydrogenase, riboflavin, medium chain triglycerides, dicarboxylic acids.

scholarly journals Engineering the Monomer Composition of Polyhydroxyalkanoates Synthesized in Saccharomyces cerevisiae

2006 ◽  
Vol 72 (1) ◽  
pp. 536-543 ◽  
Author(s):  
Bo Zhang ◽  
Ross Carlson ◽  
Friedrich Srienc
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Fatty Acid ◽  
Chain Length ◽  
Fatty Acid Metabolism ◽  
Acid Metabolism ◽  
Pha Synthase ◽  
Fatty Acid Degradation ◽  
Medium Chain ◽  
Acid Degradation ◽  
Wide Range

ABSTRACT Polyhydroxyalkanoates (PHAs) have received considerable interest as renewable-resource-based, biodegradable, and biocompatible plastics with a wide range of potential applications. We have engineered the synthesis of PHA polymers composed of monomers ranging from 4 to 14 carbon atoms in either the cytosol or the peroxisome of Saccharomyces cerevisiae by harnessing intermediates of fatty acid metabolism. Cytosolic PHA production was supported by establishing in the cytosol critical β-oxidation chemistries which are found natively in peroxisomes. This platform was utilized to supply medium-chain (C6 to C14) PHA precursors from both fatty acid degradation and synthesis to a cytosolically expressed medium-chain-length (mcl) polymerase from Pseudomonas oleovorans. Synthesis of short-chain-length PHAs (scl-PHAs) was established in the peroxisome of a wild-type yeast strain by targeting the Ralstonia eutropha scl polymerase to the peroxisome. This strain, harboring a peroxisomally targeted scl-PHA synthase, accumulated PHA up to approximately 7% of its cell dry weight. These results indicate (i) that S. cerevisiae expressing a cytosolic mcl-PHA polymerase or a peroxisomal scl-PHA synthase can use the 3-hydroxyacyl coenzyme A intermediates from fatty acid metabolism to synthesize PHAs and (ii) that fatty acid degradation is also possible in the cytosol as β-oxidation might not be confined only to the peroxisomes. Polymers of even-numbered, odd-numbered, or a combination of even- and odd-numbered monomers can be controlled by feeding the appropriate substrates. This ability should permit the rational design and synthesis of polymers with desired material properties.

scholarly journals Reply: “Letter to the Editor Re: Billeaud et al. Nutrients 2018, 10, 690”

Nutrients ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 406
Author(s):  
Claude Billeaud ◽  
Carole Boué-Vaysse ◽  
Leslie Couëdelo ◽  
Philippe Steenhout ◽  
Jonathan Jaeger ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Docosahexaenoic Acid ◽  
Human Milk ◽  
Preterm Infants ◽  
Fatty Acid Metabolism ◽  
Acid Metabolism ◽  
Medium Chain ◽  
Letter To The Editor ◽  
Human Milk Fortifier

We thank Bernard and colleagues for their careful reading and interest in our article Effects on Fatty Acid Metabolism of a New Powdered Human Milk Fortifier Containing Medium-Chain Triacylglycerols and Docosahexaenoic Acid in Preterm Infants [...]

scholarly journals Fatty acid oxidation inhibitor etomoxir suppresses tumor progression and induces cell cycle arrest via PPARγ-mediated pathway in bladder cancer

2019 ◽  
Vol 133 (15) ◽  
pp. 1745-1758 ◽  
Author(s):  
Songtao Cheng ◽  
Gang Wang ◽  
Yejinpeng Wang ◽  
Liwei Cai ◽  
Kaiyu Qian ◽  
...  
Keyword(s):  
Cell Cycle ◽  
Bladder Cancer ◽  
Fatty Acid ◽  
Tumor Progression ◽  
Cell Cycle Arrest ◽  
Fatty Acid Oxidation ◽  
Fatty Acid Metabolism ◽  
Acid Metabolism ◽  
Acid Oxidation ◽  
Cycle Arrest

Abstract Tumor cells rely on aerobic glycolysis as their main energy resource (Warburg effect). Recent research has highlighted the importance of lipid metabolism in tumor progression, and certain cancers even turn to fatty acids as the main fuel. Related studies have identified alterations of fatty acid metabolism in human bladder cancer (BCa). Our microarray analysis showed that fatty acid metabolism was activated in BCa compared with normal bladder. The free fatty acid (FFA) level was also increased in BCa compared with paracancerous tissues. Inhibition of fatty acid oxidation (FAO) with etomoxir caused lipid accumulation, decreased adenosine triphosphate (ATP) and nicotinamide adenine dinucleotide phosphate (NADPH) levels, suppressed BCa cell growth in vitro and in vivo, and reduced motility of BCa cells via affecting epithelial–mesenchymal transition (EMT)-related proteins. Furthermore, etomoxir induced BCa cell cycle arrest at G0/G1 phase through peroxisome proliferator-activated receptor (PPAR) γ-mediated pathway with alterations in fatty acid metabolism associated gene expression. The cell cycle arrest could be reversed by PPARγ antagonist GW9662. Taken together, our results suggest that inhibition of FAO with etomoxir may provide a novel avenue to investigate new therapeutic approaches to human BCa.

scholarly journals PCB11 Metabolite, 3,3’-Dichlorobiphenyl-4-ol, Exposure Alters the Expression of Genes Governing Fatty Acid Metabolism in the Absence of Functional Sirtuin 3: Examining the Contribution of MnSOD

Antioxidants ◽  
2018 ◽  
Vol 7 (9) ◽  
pp. 121 ◽  
Author(s):  
Sinthia Alam ◽  
Gwendolyn Carter ◽  
Kimberly Krager ◽  
Xueshu Li ◽  
Hans-Joachim Lehmler ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Metabolism ◽  
Mitochondrial Respiration ◽  
Mammalian Cells ◽  
Acid Metabolism ◽  
Cellular Growth ◽  
Acid Oxidation ◽  
Sirtuin 3 ◽  
Endogenous Fatty Acid ◽  
Mnsod Activity

Although the production of polychlorinated biphenyls (PCBs) is prohibited, the inadvertent production of certain lower-chlorinated PCB congeners still threatens human health. We and others have identified 3,3’-dichlorobiphenyl (PCB11) and its metabolite, 3,3’-dichlorobiphenyl-4-ol (4OH-PCB11), in human blood, and there is a correlation between exposure to this metabolite and mitochondrial oxidative stress in mammalian cells. Here, we evaluated the downstream effects of 4OH-PCB11 on mitochondrial metabolism and function in the presence and absence of functional Sirtuin 3 (SIRT3), a mitochondrial fidelity protein that protects redox homeostasis. A 24 h exposure to 3 μM 4OH-PCB11 significantly decreased the cellular growth and mitochondrial membrane potential of SIRT3-knockout mouse embryonic fibroblasts (MEFs). Only wild-type cells demonstrated an increase in Manganese superoxide dismutase (MnSOD) activity in response to 4OH-PCB11–induced oxidative injury. This suggests the presence of a SIRT3-mediated post-translational modification to MnSOD, which was impaired in SIRT3-knockout MEFs, which counters the PCB insult. We found that 4OH-PCB11 increased mitochondrial respiration and endogenous fatty-acid oxidation-associated oxygen consumption in SIRT3-knockout MEFs; this appeared to occur because the cells exhausted their reserve respiratory capacity. To determine whether these changes in mitochondrial respiration were accompanied by similar changes in the regulation of fatty acid metabolism, we performed quantitative real-time polymerase chain reaction (qRT-PCR) after a 24 h treatment with 4OH-PCB11. In SIRT3-knockout MEFs, 4OH-PCB11 significantly increased the expression of ten genes controlling fatty acid biosynthesis, metabolism, and transport. When we overexpressed MnSOD in these cells, the expression of six of these genes returned to the baseline level, suggesting that the protective role of SIRT3 against 4OH-PCB11 is partially governed by MnSOD activity.

Effect of hyperglycemia-hyperinsulinemia on whole body and regional fatty acid metabolism

1999 ◽  
Vol 276 (3) ◽  
pp. E427-E434 ◽  
Author(s):  
Labros S. Sidossis ◽  
Bettina Mittendorfer ◽  
David Chinkes ◽  
Eric Walser ◽  
Robert R. Wolfe
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Oxidation ◽  
Fatty Acid Metabolism ◽  
Acid Metabolism ◽  
Fatty Acid Uptake ◽  
Whole Body ◽  
Acid Oxidation ◽  
Acid Uptake ◽  
Similar Extent ◽  
Body Level

The effects of combined hyperglycemia-hyperinsulinemia on whole body, splanchnic, and leg fatty acid metabolism were determined in five volunteers. Catheters were placed in a femoral artery and vein and a hepatic vein. U-13C-labeled fatty acids were infused, once in the basal state and, on a different occasion, during infusion of dextrose (clamp; arterial glucose 8.8 ± 0.5 mmol/l). Lipids and heparin were infused together with the dextrose to maintain plasma fatty acid concentrations at basal levels. Fatty acid availability in plasma and fatty acid uptake across the splanchnic region and the leg were similar during the basal and clamp experiments. Dextrose infusion decreased fatty acid oxidation by 51.8% (whole body), 47.4% (splanchnic), and 64.3% (leg). Similarly, the percent fatty acid uptake oxidized decreased at the whole body level (53 to 29%), across the splanchnic region (30 to 13%), and in the leg (48 to 22%) during the clamp. We conclude that, in healthy men, combined hyperglycemia-hyperinsulinemia inhibits fatty acid oxidation to a similar extent at the whole body level, across the leg, and across the splanchnic region, even when fatty acid availability is constant.

scholarly journals ACLY ubiquitination by CUL3-KLHL25 induces the reprogramming of fatty acid metabolism to facilitate iTreg differentiation

eLife ◽  
2021 ◽  
Vol 10 ◽  
Author(s):  
Miaomiao Tian ◽  
Fengqi Hao ◽  
Xin Jin ◽  
Xue Sun ◽  
Ying Jiang ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Fatty Acid Metabolism ◽  
Acid Metabolism ◽  
Transforming Growth Factor ◽  
Cell Metabolism ◽  
Acid Synthesis ◽  
Transforming Growth Factor Β1 ◽  
Acid Oxidation ◽  
Atp Citrate Lyase ◽  
Metabolic Intermediate

Inducible regulatory T (iTreg) cells play a central role in immune suppression. As iTreg cells are differentiated from activated T (Th0) cells, cell metabolism undergoes dramatic changes, including a shift from fatty acid synthesis (FAS) to fatty acid oxidation (FAO). Although the reprogramming in fatty acid metabolism is critical, the mechanism regulating this process during iTreg differentiation is still unclear. Here we have revealed that the enzymatic activity of ATP-citrate lyase (ACLY) declined significantly during iTreg differentiation upon transforming growth factor β1 (TGFβ1) stimulation. This reduction was due to CUL3-KLHL25-mediated ACLY ubiquitination and degradation. As a consequence, malonyl-CoA, a metabolic intermediate in FAS that is capable of inhibiting the rate-limiting enzyme in FAO, carnitine palmitoyltransferase 1 (CPT1), was decreased. Therefore, ACLY ubiquitination and degradation facilitate FAO and thereby iTreg differentiation. Together, we suggest TGFβ1-CUL3-KLHL25-ACLY axis as an important means regulating iTreg differentiation and bring insights into the maintenance of immune homeostasis for the prevention of immune diseases.

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