379 results match your criteria Pyruvate Carboxylase Deficiency

Lack of liver glycogen causes hepatic insulin resistance and steatosis in mice.

J Biol Chem 2017 06 8;292(25):10455-10464. Epub 2017 May 8.

From the Departments of Biochemistry and Molecular Biology and

Disruption of the gene encoding the liver isoform of glycogen synthase generates a mouse strain (LGSKO) that almost completely lacks hepatic glycogen, has impaired glucose disposal, and is pre-disposed to entering the fasted state. This study investigated how the lack of liver glycogen increases fat accumulation and the development of liver insulin resistance. Insulin signaling in LGSKO mice was reduced in liver, but not muscle, suggesting an organ-specific defect. Read More

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Proteomics of FACS-sorted heterogeneous Corynebacterium glutamicum populations.

J Proteomics 2017 05 18;160:1-7. Epub 2017 Mar 18.

Department of Plant Biochemistry, Ruhr-University Bochum, 44801 Bochum, Germany; School of Biomedical and Healthcare Sciences, Plymouth University, Plymouth PL4 8AA, United Kingdom. Electronic address:

The metabolic status of individual cells in microbial cultures can differ, being relevant for biotechnology, environmental and medical microbiology. However, it is hardly understood in molecular detail due to limitations of current analytical tools. Here, we demonstrate that FACS in combination with proteomics can be used to sort and analyze cell populations based on their metabolic state. Read More

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The Role of Carbohydrate Response Element Binding Protein in Intestinal and Hepatic Fructose Metabolism.

Katsumi Iizuka

Nutrients 2017 Feb 22;9(2). Epub 2017 Feb 22.

Department of Diabetes and Endocrinology, Graduate School of Medicine, Gifu University, Gifu 501-1194, Japan.

Many articles have discussed the relationship between fructose consumption and the incidence of obesity and related diseases. Fructose is absorbed in the intestine and metabolized in the liver to glucose, lactate, glycogen, and, to a lesser extent, lipids. Unabsorbed fructose causes bacterial fermentation, resulting in irritable bowl syndrome. Read More

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February 2017

CHO Cells adapted to inorganic phosphate limitation show higher growth and higher pyruvate carboxylase flux in phosphate replete conditions.

Biotechnol Prog 2017 May 11;33(3):749-758. Epub 2017 Mar 11.

Chemical Engineering and Process Development Div., CSIR-National Chemical Laboratory, Pune, 411008, India.

Inorganic phosphate (P ) is an essential ion involved in diverse cellular processes including metabolism. Changes in cellular metabolism upon long term adaptation to P limitation have been reported in E. coli. Read More

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Boosting Anaplerotic Reactions by Pyruvate Kinase Gene Deletion and Phosphoenolpyruvate Carboxylase Desensitization for Glutamic Acid and Lysine Production in Corynebacterium glutamicum.

Adv Biochem Eng Biotechnol 2017;159:181-198

Laboratory of Microbial Physiology, Research Faculty of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo, 060-8589, Japan.

In the 1980s, Shiio and coworkers demonstrated using random mutagenesis that the following three phenotypes were effective for boosting lysine production by Corynebacterium glutamicum: (1) low-activity-level citrate synthase (CS), (2) phosphoenolpyruvate carboxylase (PEPC) resistant to feedback inhibition by aspartic acid (PEPC), and (3) pyruvate kinase (PYK) deficiency. Here, we reevaluated these phenotypes and their interrelationship in lysine production using recombinant DNA techniques.The pyk deletion and PEPC (D299N in ppc) independently showed marginal effects on lysine production, but both phenotypes synergistically increased lysine yield, demonstrating the importance of PEPC as an anaplerotic enzyme in lysine production. Read More

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September 2017

Quantitative metabolic flux analysis reveals an unconventional pathway of fatty acid synthesis in cancer cells deficient for the mitochondrial citrate transport protein.

Metab Eng 2017 09 14;43(Pt B):198-207. Epub 2016 Nov 14.

Children's Medical Center Research Institute, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA; Department of Pediatrics, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA; McDermott Center for Human Growth and Development, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA. Electronic address:

The mitochondrial citrate transport protein (CTP), encoded by SLC25A1, accommodates bidirectional trafficking of citrate between the mitochondria and cytosol, supporting lipid biosynthesis and redox homeostasis. Genetic CTP deficiency causes a fatal neurodevelopmental syndrome associated with the accumulation of L- and D-2-hydroxyglutaric acid, and elevated CTP expression is associated with poor prognosis in several types of cancer, emphasizing the importance of this transporter in multiple human pathologies. Here we describe the metabolic consequences of CTP deficiency in cancer cells. Read More

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September 2017

Astrocyte Dysfunction in Developmental Neurometabolic Diseases.

Adv Exp Med Biol 2016 ;949:227-243

Neurodegeneration Laboratory, Institut Pasteur Montevideo, Montevideo, Uruguay.

Astrocytes play crucial roles in maintaining brain homeostasis and in orchestrating neural development, all through tightly coordinated steps that cooperate to maintain the balance needed for normal development. Here, we review the alterations in astrocyte functions that contribute to a variety of developmental neurometabolic disorders and provide additional data on the predominant role of astrocyte dysfunction in the neurometabolic neurodegenerative disease glutaric acidemia type I. Finally, we describe some of the therapeutical approaches directed to neurometabolic diseases and discuss if astrocytes can be possible therapeutic targets for treating these disorders. Read More

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September 2017

Effects of Biotin Deficiency on Biotinylated Proteins and Biotin-Related Genes in the Rat Brain.

J Nutr Sci Vitaminol (Tokyo) 2016 ;62(2):81-7

Department of Dietary Environment Analysis, School of Human Science and Environment, University of Hyogo.

Biotin is a water-soluble vitamin that functions as a cofactor for biotin-dependent carboxylases. The biochemical and physiological roles of biotin in brain regions have not yet been investigated sufficiently in vivo. Thus, in order to clarify the function of biotin in the brain, we herein examined biotin contents, biotinylated protein expression (e. Read More

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Antenatal manifestations of inborn errors of metabolism: autopsy findings suggestive of a metabolic disorder.

J Inherit Metab Dis 2016 09 22;39(5):597-610. Epub 2016 Apr 22.

Department of Department of Biochemistry, Hôpital Femme Mère Enfant, Hospices Civils de Lyon, 59 bd Pinel, 69677, Bron cedex, France.

This review highlights the importance of performing an autopsy when faced with fetal abortion or termination of pregnancy with suspicion of an inborn error of metabolism. Radiological, macroscopic and microscopic features found at autopsy as well as placental anomalies that can suggest such a diagnosis are detailed. The following metabolic disorders encountered in fetuses are discussed: lysosomal storage diseases, peroxisomal disorders, cholesterol synthesis disorders, congenital disorders of glycosylation, glycogenosis type IV, mitochondrial respiratory chain disorders, transaldolase deficiency, generalized arterial calcification of infancy, hypophosphatasia, arylsulfatase E deficiency, inborn errors of serine metabolism, asparagine synthetase deficiency, hyperphenylalaninemia, glutaric aciduria type I, non-ketotic hyperglycinemia, pyruvate dehydrogenase deficiency, pyruvate carboxylase deficiency, glutamine synthase deficiency, sulfite oxidase and molybdenum cofactor deficiency. Read More

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September 2016

Biotinylation: a novel posttranslational modification linking cell autonomous circadian clocks with metabolism.

Am J Physiol Heart Circ Physiol 2016 06 15;310(11):H1520-32. Epub 2016 Apr 15.

Division of Cardiovascular Disease, Department of Medicine, University of Alabama at Birmingham, Birmingham, Alabama;

Circadian clocks are critical modulators of metabolism. However, mechanistic links between cell autonomous clocks and metabolic processes remain largely unknown. Here, we report that expression of the biotin transporter slc5a6 gene is decreased in hearts of two distinct genetic mouse models of cardiomyocyte-specific circadian clock disruption [i. Read More

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Synergistic Inhibitory Effects of Hypoxia and Iron Deficiency on Hepatic Glucose Response in Mouse Liver.

Diabetes 2016 06 18;65(6):1521-33. Epub 2016 Mar 18.

Department of Internal Medicine, University of Utah, Salt Lake City, UT Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, NC Department of Biochemistry, University of Utah, Salt Lake City, UT

Hypoxia and iron both regulate metabolism through multiple mechanisms, including hypoxia-inducible transcription factors. The hypoxic effects on glucose disposal and glycolysis are well established, but less is known about the effects of hypoxia and iron deficiency on hepatic gluconeogenesis. We therefore assessed their effects on hepatic glucose production in mice. Read More

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Pyruvate kinase deletion as an effective phenotype to enhance lysine production in Corynebacterium glutamicum ATCC13032: Redirecting the carbon flow to a precursor metabolite.

J Biosci Bioeng 2016 Aug 13;122(2):160-7. Epub 2016 Mar 13.

Laboratory of Microbial Physiology, Research Faculty of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo, Hokkaido 060-8589, Japan. Electronic address:

Various attempts have been made to enhance lysine production in Corynebacterium glutamicum. Pyruvate kinase (PYK) defect is one of the strategies used to enhance the supply of oxaloacetic acid (OAA), a precursor metabolite for lysine biosynthesis. However, inconsistent effects of this mutation have been reported: positive effects of PYK defect in mutants having phosphoenolpyruvate carboxylase (PEPC) desensitized to feedback inhibition by aspartic acid, while negative effects in simple PYK gene (pyk) knockout mutants. Read More

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Biotin deprivation impairs mitochondrial structure and function and has implications for inherited metabolic disorders.

Mol Genet Metab 2015 Nov 1;116(3):204-14. Epub 2015 Sep 1.

Unidad de Genética de la Nutrición, Instituto de Investigaciones Biomédicas de la Universidad Nacional Autónoma de México y del Instituto Nacional de Pediatría, México D.F., México. Electronic address:

Certain inborn errors of metabolism result from deficiencies in biotin containing enzymes. These disorders are mimicked by dietary absence or insufficiency of biotin, ATP deficit being a major effect,whose responsible mechanisms have not been thoroughly studied. Here we show that in rats and cultured cells it is the result of reduced TCA cycle flow, partly due to deficient anaplerotic biotin-dependent pyruvate carboxylase. Read More

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November 2015

Diet-induced obesity in the selenocysteine lyase knockout mouse.

Antioxid Redox Signal 2015 Oct 24;23(10):761-74. Epub 2015 Aug 24.

Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii at Manoa , Honolulu, Hawaii.

Aims: Selenocysteine lyase (Scly) mediates selenocysteine decomposition. It was previously demonstrated that, upon adequate caloric intake (12% kcal fat) and selenium deficiency, disruption of Scly in mice leads to development of metabolic syndrome. In this study, we investigate the effect of a high-fat (45% kcal) selenium-adequate diet in Scly knockout (KO) mice on development of metabolic syndrome. Read More

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October 2015

Effects of phosphoenolpyruvate carboxylase desensitization on glutamic acid production in Corynebacterium glutamicum ATCC 13032.

J Biosci Bioeng 2016 Feb 11;121(2):172-7. Epub 2015 Jul 11.

Laboratory of Microbial Physiology, Research Faculty of Agriculture, Hokkaido University, Kita-9 Nishi-9, Kita-ku, Sapporo, Hokkaido 060-8589, Japan. Electronic address:

Phosphoenolpyruvate carboxylase (PEPC) in Corynebacterium glutamicum ATCC13032, a glutamic-acid producing actinobacterium, is subject to feedback inhibition by metabolic intermediates such as aspartic acid and 2-oxoglutaric acid, which implies the importance of PEPC in replenishing oxaloacetic acid into the TCA cycle. Here, we investigated the effects of feedback-insensitive PEPC on glutamic acid production. A single amino-acid substitution in PEPC, D299N, was found to relieve the feedback control by aspartic acid, but not by 2-oxoglutaric acid. Read More

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February 2016

Indoleamine 2,3-dioxygenase depletes tryptophan, activates general control non-derepressible 2 kinase and down-regulates key enzymes involved in fatty acid synthesis in primary human CD4+ T cells.

Immunology 2015 Oct 27;146(2):292-300. Epub 2015 Jul 27.

Department of Nephrology, Medical School, University of Thessaly, Larissa, Greece.

Indoleamine 2,3-dioxygenase (IDO) is expressed in antigen-presenting cells and exerts immunosuppressive effects on CD4(+) T cells. One mechanism is through the inhibition of aerobic glycolysis. Another prerequisite for T-cell proliferation and differentiation into effector cells is increased fatty acid (FA) synthesis. Read More

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October 2015

Pyruvate carboxylase deficiency: An underestimated cause of lactic acidosis.

Mol Genet Metab Rep 2015 Mar 28;2:25-31. Epub 2014 Nov 28.

Centre de Référence des Maladies Héréditaires du Métabolisme, Hôpital Necker, APHP, Paris, France.

Pyruvate carboxylase (PC) is a biotin-containing mitochondrial enzyme that catalyzes the conversion of pyruvate to oxaloacetate, thereby being involved in gluconeogenesis and in energy production through replenishment of the tricarboxylic acid (TCA) cycle with oxaloacetate. PC deficiency is a very rare metabolic disorder. We report on a new patient affected by the moderate form (the American type A). Read More

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TR4 promotes fatty acid synthesis in 3T3-L1 adipocytes by activation of pyruvate carboxylase expression.

FEBS Lett 2014 Nov 19;588(21):3947-53. Epub 2014 Sep 19.

Department of Biological Sciences, College of Natural Sciences, Chonnam National University, South Korea. Electronic address:

We show that testicular orphan nuclear receptor 4 (TR4) increases the expression of pyruvate carboxylase (PC) gene in 3T3-L1 adipocytes by direct binding to a TR4 responsive element in the murine PC promoter. While TR4 overexpression increased PC activity, oxaloacetate (OAA) and glycerol levels with enhanced incorporation of (14)C from (14)C-pyruvate into fatty acids in 3T3-L1 adipocytes, PC knockdown by short interfering RNA (siRNA) or inhibition of PC activity by phenylacetic acid (PAA) abolished TR4-enhanced fatty acid synthesis. Moreover, TR4 microRNA reduced PC expression with decreased fatty acid synthesis in 3T3-L1 adipocytes, suggesting that TR4-mediated enhancement of fatty acid synthesis in adipocytes requires increased expression of PC gene. Read More

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November 2014

Effects of boron deficiency on major metabolites, key enzymes and gas exchange in leaves and roots of Citrus sinensis seedlings.

Tree Physiol 2014 Jun 23;34(6):608-18. Epub 2014 Jun 23.

College of Resource and Environmental Science, Fujian Agriculture and Forestry University, Fuzhou 350002, China Institute of Horticultural Plant Physiology, Biochemistry and Molecular Biology, Fujian Agriculture and Forestry University, Fuzhou 350002, China Fujian Key Laboratory for Plant Molecular and Cell Biology, Fujian Agriculture and Forestry University, Fuzhou 350002, China

Boron (B) deficiency is a widespread problem in many crops, including Citrus. The effects of B-deficiency on gas exchange, carbohydrates, organic acids, amino acids, total soluble proteins and phenolics, and the activities of key enzymes involved in organic acid and amino acid metabolism in 'Xuegan' [Citrus sinensis (L.) Osbeck] leaves and roots were investigated. Read More

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A change in liver metabolism but not in brown adipose tissue thermogenesis is an early event in ovariectomy-induced obesity in rats.

Endocrinology 2014 Aug 10;155(8):2881-91. Epub 2014 Jun 10.

Laboratório de Bioenergética (M.N., A.T.S., C.S.B., L.A.K., L.d.M.), Instituto de Bioquímica Médica, Laboratório de Radiobiologia Molecular (R.S.F.) and Laboratório de Fisiologia Endócrina Doris Rosenthal (R.A.N.L., D.P.C.), Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-902, Brazil.

Menopause is associated with increased visceral adiposity and disrupted glucose homeostasis, but the underlying molecular mechanisms related to these metabolic changes are still elusive. Brown adipose tissue (BAT) plays a key role in energy expenditure that may be regulated by sexual steroids, and alterations in glucose homeostasis could precede increased weight gain after ovariectomy. Thus, the aim of this work was to evaluate the metabolic pathways in both the BAT and the liver that may be disrupted early after ovariectomy. Read More

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Interactions between light intensity and phosphorus nutrition affect the phosphate-mining capacity of white lupin (Lupinus albus L.).

J Exp Bot 2014 Jul 10;65(12):2995-3003. Epub 2014 Apr 10.

Department of Plant Nutrition, China Agricultural University, Beijing 100193, P. R. China.

Light intensity affects photosynthetic carbon (C) fixation and the supply of carbon to roots. To evaluate interactions between carbon supply and phosphorus (P) supply, effects of light intensity on sucrose accumulation, root growth, cluster root formation, carboxylate exudation, and P uptake capacity were studied in white lupin (Lupinus albus L.) grown hydroponically with either 200 µmol m(-2) s(-1) or 600 µmol m(-2) s(-1) light and a sufficient (50 µM P) or deficient (1 µM P) P supply. Read More

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PCK2 activation mediates an adaptive response to glucose depletion in lung cancer.

Oncogene 2015 Feb 17;34(8):1044-50. Epub 2014 Mar 17.

Division of Pulmonology, Department of Internal Medicine, Medical University of Graz, Graz, Austria.

Cancer cells are reprogrammed to utilize glycolysis at high rates, which provides metabolic precursors for cell growth. Consequently, glucose levels may decrease substantially in underperfused tumor areas. Gluconeogenesis results in the generation of glucose from smaller carbon substrates such as lactate and amino acids. Read More

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February 2015

Mitochondrial carbonic anhydrase VA deficiency resulting from CA5A alterations presents with hyperammonemia in early childhood.

Am J Hum Genet 2014 Mar 13;94(3):453-61. Epub 2014 Feb 13.

Division of Biochemical Diseases, BC Children's Hospital, University of British Columbia, Vancouver, BC V6H 3V4, Canada; Department of Pediatrics, BC Children's Hospital, University of British Columbia, Vancouver, BC V6H 3V4, Canada; Treatable Intellectual Disability Endeavour in British Columbia, BC Children's Hospital, University of British Columbia, Vancouver, BC V5Z 4H4, Canada.

Four children in three unrelated families (one consanguineous) presented with lethargy, hyperlactatemia, and hyperammonemia of unexplained origin during the neonatal period and early childhood. We identified and validated three different CA5A alterations, including a homozygous missense mutation (c.697T>C) in two siblings, a homozygous splice site mutation (c. Read More

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Ammonia metabolism and hyperammonemic disorders.

Valerie Walker

Adv Clin Chem 2014 4;67:73-150. Epub 2014 Nov 4.

Department of Clinical Biochemistry, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom. Electronic address:

Human adults produce around 1000 mmol of ammonia daily. Some is reutilized in biosynthesis. The remainder is waste and neurotoxic. Read More

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September 2015

Kefir improves fatty liver syndrome by inhibiting the lipogenesis pathway in leptin-deficient ob/ob knockout mice.

Int J Obes (Lond) 2014 Sep 16;38(9):1172-9. Epub 2013 Dec 16.

1] Department of Life Sciences, Agricultural Biotechnology Center, National Chung Hsing University, Taichung, Taiwan [2] Rong Hsing Research Center for Translational Medicine and the iEGG Center, National Chung Hsing University, Taichung, Taiwan.

Objective: Fatty liver disease is commonly associated with obesity, insulin resistance and diabetes. Severe fatty liver is sometimes accompanied by steatohepatitis and may lead to the development of hepatocellular carcinoma. At present, there is no effective treatment for non-alcoholic fatty liver disease (NAFLD); thus, recent investigations have focused on developing effective therapeutics to treat this condition. Read More

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September 2014

Unsuccessful treatment of severe pyruvate carboxylase deficiency with triheptanoin.

Eur J Pediatr 2014 Mar 10;173(3):361-6. Epub 2013 Oct 10.

Willink Unit, Genetic Medicine, Manchester Academic Health Sciences Centre, Central Manchester University Hospitals NHS Foundation Trust, Oxford Road, Manchester, M13 9WL, UK.

Unlabelled: Pyruvate carboxylase (PC) deficiency (OMIM 266150) is an autosomal recessive disorder that usually presents with lactic acidaemia and severe neurological dysfunction, leading to death in infancy. Because the enzyme is involved in gluconeogenesis and anaplerosis of the Krebs cycle, therapeutic strategies have included avoiding fasting and attempts to correct the defect of anaplerosis. Triheptanoin is a triglyceride of C7 fatty acids. Read More

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[Delayed onset holocarboxylase synthetase deficiency with normal pyruvate carboxylase activity].

An Pediatr (Barc) 2014 Mar 5;80(3):184-6. Epub 2013 Oct 5.

Unidad de Nutrición y Metabolopatías, Hospital La Fe, Valencia, España.

We report a case of holocarboxylase synthetase deficiency with normal pyruvate carboxylase activity in the lymphocytes of an 8 year-old girl with clinical toxicity without the classic dermatological involvement. The identification of three nucleotide changes in the holocarboxylase synthetase (HLCS) gene, only one of them described as a pathogenic mutation could be related to a slight variant of the disease that would explain the unusual presentation beyond the age of infant. Treatment with biotin at 40 mg/day with protein controlled diet allows normal physical growth and psychomotor development for their age. Read More

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Impact of hematopoietic cyclooxygenase-1 deficiency on obesity-linked adipose tissue inflammation and metabolic disorders in mice.

Metabolism 2013 Nov 27;62(11):1673-85. Epub 2013 Aug 27.

Department of Molecular Physiology and Biophysics; Department of Internal Medicine/Division of Diabetes, Endocrinology, and Metabolism; Department of Cellular and Integrative Physiology, University of Nebraska Medical Center; VA Nebraska Western Iowa Health Care System, Omaha, NE. Electronic address:

Objective: Adipose tissue (AT)-specific inflammation is considered to mediate the pathological consequences of obesity and macrophages are known to activate inflammatory pathways in obese AT. Because cyclooxygenases play a central role in regulating the inflammatory processes, we sought to determine the role of hematopoietic cyclooxygenase-1 (COX-1) in modulating AT inflammation in obesity.

Materials/methods: Bone marrow transplantation was performed to delete COX-1 in hematopoietic cells. Read More

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November 2013

Infantile parkinsonism and GABAergic hypotransmission in a patient with pyruvate carboxylase deficiency.

Gene 2013 Dec 23;532(2):302-6. Epub 2013 Aug 23.

Department of Neurology, Hospital Sant Joan de Déu, Barcelona, Spain; CIBERER (Biomedical Network Research Centre on Rare Diseases), Instituto de Salud Carlos III, Madrid, Spain.

Pyruvate carboxylase deficiency is a rare metabolic disorder, with three different phenotypes. We aim to report the case of a newborn presenting the severe neonatal form of this deficiency (the B or "French" phenotype, hypokinesia and rigidity being the main features) and the results of the study of classic neurotransmitters involved in movement control. Hyperdopaminergic transmission (both in the cerebrospinal fluid and in the substantia nigra) and hypoGABAergic transmission (in the substantia nigra) were found. Read More

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December 2013

Methionine restriction prevents the progression of hepatic steatosis in leptin-deficient obese mice.

Metabolism 2013 Nov 5;62(11):1651-61. Epub 2013 Aug 5.

Orentreich Foundation for the Advancement of Science, Inc., 855 Route 301, Cold Spring-on-Hudson, NY 10516, USA. Electronic address:

Objective: This study investigated the effects of dietary methionine restriction (MR) on the progression of established hepatic steatosis in the leptin-deficient ob/ob mouse.

Material/methods: Ten-week-old ob/ob mice were fed diets containing 0.86% (control-fed; CF) or 0. Read More

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November 2013