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Gorce M, Lebigot E, Arion A, Brassier A, Cano A, De Lonlay P, Feillet F, Gay C, Labarthe F, Nassogne MC, Roche S, Roubertie A, Sacaze E, Touati G, Broué P. Fructose-1,6-bisphosphatase deficiency causes fatty liver disease and requires long-term hepatic follow-up. J Inherit Metab Dis 2022; 45:215-222. [PMID: 34687058 DOI: 10.1002/jimd.12452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Revised: 10/15/2021] [Accepted: 10/20/2021] [Indexed: 11/06/2022]
Abstract
Liver disease, occurring during pediatric or adult age, is often of undetermined cause. Some cases are probably related to undiagnosed inherited metabolic disorders. Hepatic disorders associated with fructose-1,6-bisphosphatase deficiency, a gluconeogenesis defect, are not reported in the literature. These symptoms are mainly described during acute crises, and many reports do not mention them because hypoglycemia and hyperlactatemia are more frequently in the forefront. Herein, the liver manifestations of 18 patients affected with fructose-1,6-bisphosphatase deficiency are described and the corresponding literature is reviewed. Interestingly, all 18 patients had liver abnormalities either during follow-up (hepatomegaly [n = 8/18], elevation of transaminases [n = 6/15], bright liver [n = 7/11]) or during acute crises (hepatomegaly [n = 10/17], elevation of transaminases [n = 13/16], acute liver failure [n = 6/14], bright liver [n = 4/14]). Initial reports described cases of liver steatosis, when liver biopsy was necessary to confirm the diagnosis by an enzymatic study. There is no clear pathophysiological basis for this fatty liver disease but we postulate that endoplasmic reticulum stress and de novo lipogenesis activation could be key factors, as observed in FBP1 knockout mice. Liver steatosis may expose patients to severe long-term liver complications. As hypoglycemia becomes less frequent with age, most adult patients are no longer monitored by hepatologist. Signs of fructose-1,6-bisphosphatase deficiency may be subtle and can be missed in childhood. We suggest that fructose-1,6-bisphosphatase deficiency should be considered as an etiology of hepatic steatosis, and a liver monitoring protocol should be set up for these patients, during lifelong follow-up.
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Affiliation(s)
- Magali Gorce
- Centre de référence des maladies héréditaires du métabolisme, Unité pédiatrique de Gastro-entérologie, hépatologie, nutrition et Maladies héréditaires du métabolisme, CHU de Toulouse-Hôpital des Enfants, Toulouse, France
| | - Elise Lebigot
- APHP, CHU Bicêtre, Service de biochimie, Le Kremlin-Bicêtre, Paris, France
| | - Alina Arion
- Centre de compétence des maladies héréditaires du métabolisme, Service de pédiatrie médicale, CHU de Caen - Hôpital de la Côte de Nacre, Caen, France
| | - Anaïs Brassier
- Centre de référence des maladies héréditaires du métabolisme, Institut Imagine, Hôpital Necker, Université Paris-Descartes, Paris, France
| | - Aline Cano
- Centre de référence des maladies héréditaires du métabolisme, Service de neurologie pédiatrique, Pédiatrie spécialisée et médecine infantile, CHU de Marseille-Hôpital de la Timone, Marseille, France
| | - Pascale De Lonlay
- Centre de référence des maladies héréditaires du métabolisme, Institut Imagine, Hôpital Necker, Université Paris-Descartes, Paris, France
| | - François Feillet
- Centre de référence des maladies héréditaires du métabolisme, Service de médecine infantile, CHU Brabois Enfants, Vandœuvre-lès-Nancy, France
| | - Claire Gay
- Centre de compétence des maladies héréditaires du métabolisme, Service de Pédiatrie, CHU de Saint-Etienne-Hôpital Nord, Saint Etienne, France
| | - François Labarthe
- Centre de référence des maladies héréditaires du métabolisme, Service de Médecine pédiatrique, Pediatrics Departement, CHRU de Tours-Hôpital Clocheville, Tours, France
| | - Marie-Cécile Nassogne
- Service de neurologie pédiatrique et Centre de référence des maladies métaboliques héréditaires-Cliniques Universitaires Saint-Luc, UCLouvain, Bruxelles, Belgium
| | - Sandrine Roche
- Centre de compétence des maladies héréditaires du métabolisme, Service de pédiatrie médicale, CHU Bordeaux, hôpital Pellegrin, Bordeaux, France
| | - Agathe Roubertie
- Centre de compétence des maladies héréditaires du métabolisme, Département de neuropédiatrie, Pôle Femme Mère Enfant, CHRU de Montpellier-Hôpital Gui de Chauliac, Montpellier, France
| | - Elise Sacaze
- Centre de compétence des maladies héréditaires du métabolisme, Service de Pédiatrie, Pôle Femme-Mère-Enfant, CHRU de Brest-Hôpital Morvan, Brest, France
| | - Guy Touati
- Centre de référence des maladies héréditaires du métabolisme, Unité pédiatrique de Gastro-entérologie, hépatologie, nutrition et Maladies héréditaires du métabolisme, CHU de Toulouse-Hôpital des Enfants, Toulouse, France
| | - Pierre Broué
- Centre de référence des maladies héréditaires du métabolisme, Unité pédiatrique de Gastro-entérologie, hépatologie, nutrition et Maladies héréditaires du métabolisme, CHU de Toulouse-Hôpital des Enfants, Toulouse, France
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Yip J, Geng X, Shen J, Ding Y. Cerebral Gluconeogenesis and Diseases. Front Pharmacol 2017; 7:521. [PMID: 28101056 PMCID: PMC5209353 DOI: 10.3389/fphar.2016.00521] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Accepted: 12/15/2016] [Indexed: 01/08/2023] Open
Abstract
The gluconeogenesis pathway, which has been known to normally present in the liver, kidney, intestine, or muscle, has four irreversible steps catalyzed by the enzymes: pyruvate carboxylase, phosphoenolpyruvate carboxykinase, fructose 1,6-bisphosphatase, and glucose 6-phosphatase. Studies have also demonstrated evidence that gluconeogenesis exists in brain astrocytes but no convincing data have yet been found in neurons. Astrocytes exhibit significant 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase-3 activity, a key mechanism for regulating glycolysis and gluconeogenesis. Astrocytes are unique in that they use glycolysis to produce lactate, which is then shuttled into neurons and used as gluconeogenic precursors for reduction. This gluconeogenesis pathway found in astrocytes is becoming more recognized as an important alternative glucose source for neurons, specifically in ischemic stroke and brain tumor. Further studies are needed to discover how the gluconeogenesis pathway is controlled in the brain, which may lead to the development of therapeutic targets to control energy levels and cellular survival in ischemic stroke patients, or inhibit gluconeogenesis in brain tumors to promote malignant cell death and tumor regression. While there are extensive studies on the mechanisms of cerebral glycolysis in ischemic stroke and brain tumors, studies on cerebral gluconeogenesis are limited. Here, we review studies done to date regarding gluconeogenesis to evaluate whether this metabolic pathway is beneficial or detrimental to the brain under these pathological conditions.
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Affiliation(s)
- James Yip
- Department of Neurosurgery, Wayne State University School of Medicine Detroit, MI, USA
| | - Xiaokun Geng
- Department of Neurosurgery, Wayne State University School of MedicineDetroit, MI, USA; China-America Institute of Neuroscience, Beijing Luhe Hospital, Capital Medical UniversityBeijing, China; Department of Neurology, Beijing Luhe Hospital, Capital Medical UniversityBeijing, China
| | - Jiamei Shen
- Department of Neurosurgery, Wayne State University School of MedicineDetroit, MI, USA; China-America Institute of Neuroscience, Beijing Luhe Hospital, Capital Medical UniversityBeijing, China
| | - Yuchuan Ding
- Department of Neurosurgery, Wayne State University School of MedicineDetroit, MI, USA; China-America Institute of Neuroscience, Beijing Luhe Hospital, Capital Medical UniversityBeijing, China
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Cubrilovic D, Haap W, Barylyuk K, Ruf A, Badertscher M, Gubler M, Tetaz T, Joseph C, Benz J, Zenobi R. Determination of protein-ligand binding constants of a cooperatively regulated tetrameric enzyme using electrospray mass spectrometry. ACS Chem Biol 2014; 9:218-26. [PMID: 24128068 DOI: 10.1021/cb4007002] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This study highlights the benefits of nano electrospray ionization mass spectrometry (nanoESI-MS) as a fast and label-free method not only for determination of dissociation constants (KD) of a cooperatively regulated enzyme but also to better understand the mechanism of enzymatic cooperativity of multimeric proteins. We present an approach to investigate the allosteric mechanism in the binding of inhibitors to the homotetrameric enzyme fructose 1,6-bisphosphatase (FBPase), a potential therapeutic target for glucose control in type 2 diabetes. A series of inhibitors binding at an allosteric site of FBPase were investigated to determine their KDs by nanoESI-MS. The KDs determined by ESI-MS correlate very well with IC50 values in solution. The Hill coefficients derived from nanoESI-MS suggest positive cooperativity. From single-point measurements we could obtain information on relative potency, stoichiometry, conformational changes, and mechanism of cooperativity. A new X-ray crystal structure of FBPase tetramer binding ligand 3 in a 4:4 stoichiometry is also reported. NanoESI-MS-based results match the current understanding of the investigated system and are in agreement with the X-ray structural data, but provide additional mechanistic insight on the ligand binding, due to the better dynamic resolution. This method offers a powerful approach for studying other proteins with allosteric binding sites, as well.
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Affiliation(s)
- Dragana Cubrilovic
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Wolfgang Haap
- F. Hoffmann-La Roche Ltd, Discovery Research, Grenzacherstr. 124, 4070 Basel, Switzerland
| | - Konstantin Barylyuk
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Armin Ruf
- F. Hoffmann-La Roche Ltd, Discovery Research, Grenzacherstr. 124, 4070 Basel, Switzerland
| | - Martin Badertscher
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Marcel Gubler
- F. Hoffmann-La Roche Ltd, Discovery Research, Grenzacherstr. 124, 4070 Basel, Switzerland
| | - Tim Tetaz
- F. Hoffmann-La Roche Ltd, Discovery Research, Grenzacherstr. 124, 4070 Basel, Switzerland
| | - Catherine Joseph
- F. Hoffmann-La Roche Ltd, Discovery Research, Grenzacherstr. 124, 4070 Basel, Switzerland
| | - Jörg Benz
- F. Hoffmann-La Roche Ltd, Discovery Research, Grenzacherstr. 124, 4070 Basel, Switzerland
| | - Renato Zenobi
- Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
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Adeva M, González-Lucán M, Seco M, Donapetry C. Enzymes involved in l-lactate metabolism in humans. Mitochondrion 2013; 13:615-29. [DOI: 10.1016/j.mito.2013.08.011] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 07/29/2013] [Accepted: 08/30/2013] [Indexed: 12/20/2022]
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Huidekoper HH, Visser G, Ackermans MT, Sauerwein HP, Wijburg FA. A potential role for muscle in glucose homeostasis: in vivo kinetic studies in glycogen storage disease type 1a and fructose-1,6-bisphosphatase deficiency. J Inherit Metab Dis 2010; 33:25-31. [PMID: 20127282 PMCID: PMC2828550 DOI: 10.1007/s10545-009-9030-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/11/2009] [Revised: 12/07/2009] [Accepted: 12/09/2009] [Indexed: 11/30/2022]
Abstract
BACKGROUND A potential role for muscle in glucose homeostasis was recently suggested based on characterization of extrahepatic and extrarenal glucose-6-phosphatase (glucose-6-phosphatase-beta). To study the role of extrahepatic tissue in glucose homeostasis during fasting glucose kinetics were studied in two patients with a deficient hepatic and renal glycogenolysis and/or gluconeogenesis. DESIGN Endogenous glucose production (EGP), glycogenolysis (GGL), and gluconeogenesis (GNG) were quantified with stable isotopes in a patient with glycogen storage disease type 1a (GSD-1a) and a patient with fructose-1,6-bisphosphatase (FBPase) deficiency. The [6,6-(2)H(2)]glucose dilution method in combination with the deuterated water method was used during individualized fasting tests. RESULTS Both patients became hypoglycemic after 2.5 and 14.5 h fasting, respectively. At that time, the patient with GSD-1a had EGP 3.84 micromol/kg per min (30% of normal EGP after an overnight fast), GGL 3.09 micromol/kg per min, and GNG 0.75 micromol/kg per min. The patient with FBPase deficiency had EGP 8.53 micromol/kg per min (62% of normal EGP after an overnight fast), GGL 6.89 micromol/kg per min GGL, and GNG 1.64 micromol/kg per min. CONCLUSION EGP was severely hampered in both patients, resulting in hypoglycemia. However, despite defective hepatic and renal GNG in both disorders and defective hepatic GGL in GSD-1a, both patients were still able to produce glucose via both pathways. As all necessary enzymes of these pathways have now been functionally detected in muscle, a contribution of muscle to EGP during fasting via both GGL as well as GNG is suggested.
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Affiliation(s)
- Hidde H. Huidekoper
- Department of Pediatrics (G8-205) Academic Medical Center, University Hospital of Amsterdam, PO Box 22660, NL-1100 DD Amsterdam, The Netherlands
| | - Gepke Visser
- Wilhelmina Children’s Hospital, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Mariëtte T. Ackermans
- Department of Clinical Chemistry, Laboratory of Endocrinology, University of Amsterdam, Amsterdam, The Netherlands
| | - Hans P. Sauerwein
- Department of Endocrinology & Metabolism, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
| | - Frits A. Wijburg
- Department of Pediatrics (G8-205) Academic Medical Center, University Hospital of Amsterdam, PO Box 22660, NL-1100 DD Amsterdam, The Netherlands
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Yánez AJ, Nualart F, Droppelmann C, Bertinat R, Brito M, Concha II, Slebe JC. Broad expression of fructose-1,6-bisphosphatase and phosphoenolpyruvate carboxykinase provide evidence for gluconeogenesis in human tissues other than liver and kidney. J Cell Physiol 2003; 197:189-97. [PMID: 14502558 DOI: 10.1002/jcp.10337] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The importance of renal and hepatic gluconeogenesis in glucose homeostasis is well established, but the cellular localization of the key gluconeogenic enzymes liver fructose-1,6-bisphosphatase (FBPase) and cytosolic phosphoenolpyruvate carboxykinase (PEPCK) in these organs and the potential contribution of other tissues in this process has not been investigated in detail. Therefore, we analyzed the human tissue localization and cellular distribution of FBPase and PEPCK immunohistochemically. The localization analysis demonstrated that FBPase was expressed in many tissues that had not been previously reported to contain FBPase activity (e.g., prostate, ovary, suprarenal cortex, stomach, and heart). In some multicellular tissues, this enzyme was detected in specialized areas such as epithelial cells of the small intestine and prostate or lung pneumocytes II. Interestingly, FBPase was also present in pancreas and cortex cells of the adrenal gland, organs that are involved in the control of carbohydrate and lipid metabolism. Although similar results were obtained for PEPCK localization, different expression of this enzyme was observed in pancreas, adrenal gland, and pneumocytes type I. These results show that co-expression of FBPase and PEPCK occurs not only in kidney and liver, but also in a variety of organs such as the small intestine, stomach, adrenal gland, testis, and prostate which might also contribute to gluconeogenesis. Our results are consistent with published data on the expression of glucose-6-phosphatase in the human small intestine, providing evidence that this organ may play an important role in the human glucose homeostasis.
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Affiliation(s)
- Alejandro J Yánez
- Instituto de Bioquímica, Facultad de Ciencias, Universidad Austral de Chile, Casilla 567, Valdivia, Chile
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Skalecki K, Mularczyk W, Dzugaj A. Kinetic properties of D-fructose-1,6-bisphosphate 1-phosphohydrolase isolated from human muscle. Biochem J 1995; 310 ( Pt 3):1029-35. [PMID: 7575399 PMCID: PMC1135998 DOI: 10.1042/bj3101029] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
D-Fructose-1,6-bisphosphate 1-phosphohydrolase (EC 3.1.3.11) [Fru(1,6)Pase] was isolated from human muscle in an electrophoretically homogeneous form, free of aldolase contamination. The enzyme is inhibited by the substrate [fructose (1,6)-bisphosphate]. Km is 0.77 microM; Kis is 90 microM. The fructose-2,6-bisphosphate [Fru(2,6)P2], a regulator of gluconeogenesis, inhibits human muscle Fru(1,6)Pase with Ki = 0.13 microM. To determine Km, Kis and Ki the integrated method was used. AMP is an allosteric inhibitor of Fru(1,6)Pase. As with other mammalian isoenzymes, the human muscle enzyme is more strongly inhibited by AMP than is the liver isoenzyme [Dzugaj and Kochman (1980) Biochim. Biophys. Acta 614, 407-412]. Both of the inhibitors [AMP and Fru(2,6)P2] act synergistically on human muscle Fru(1,6)Pase. Ki for Fru(2,6)P2 determined in the presence of 0.4 microM AMP was 0.028 microM. The human muscle enzyme, like other mammalian Fru(1,6)Pases, requires Mg2+ for its activity. The Ka for magnesium was 232 microM, and h (Hill coefficient) = 2.0.
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Affiliation(s)
- K Skalecki
- Department of Animal Physiology, University of Wrocław, Poland
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Dziewulska-Szwajkowska D, Skałecki K, Dzugaj A. Kinetic parameters of human and rabbit liver D-fructose 1,6-diphosphate 1-phosphohydrolase determined at 25 and 37 degrees C. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. B, COMPARATIVE BIOCHEMISTRY 1993; 105:395-400. [PMID: 8395376 DOI: 10.1016/0305-0491(93)90247-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
1. Kinetic parameters of human and rabbit liver D-fructose 1,6-diphosphate 1-phosphohydrolase (EC 3.1.3.11) (FDP-ase) at 25 and 37 degrees C have been determined. 2. Km determined at 25 degrees C were 1.4 microM for human and 1.6 microM for rabbit enzyme; at 37 degrees C, corresponding values were 1.7 and 1.8 microM. 3. Both enzymes are allosterically inhibited by AMP. Respective values of I0.5 were 7.2 microM for human and 13.2 microM for rabbit at 25 degrees C, and 16.6 microM for human and 27.3 microM for rabbit at 37 degrees C. 4. Fructose 2,6-diphosphate, a potent regulator of gluconeogenesis, is more effective at 25 than at 37 degrees C. Ki determined at 25 degrees C was 0.07 microM for human and 0.035 microM for rabbit in comparison with 0.17 microM for human and 0.09 microM for rabbit at 37 degrees C. 5. Affinity of FDP-ase for magnesium is also dependent on temperature. For the human enzyme, Km at 25 degrees C was 226 microM and at 37 degrees C, 176 microM. For the rabbit enzyme, corresponding values were 256 and 240 microM. 6. Both enzymes are activated by KCl. Determined values of A0.5 were 91 mM for human, and 50 mM for rabbit enzyme at 25 degrees C, and 129 mM for human and 100 mM for rabbit enzyme at 37 degrees C.
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Abstract
A patient is described who presented with the signs and symptoms of hereditary fructose intolerance a few hours after her first fructose challenge. The diagnosis was confirmed by the demonstration of reduced activity of hepatic aldolase B towards fructose-1-phosphate. A second liver biopsy 10 months later had normal aldolase B activity towards fructose-1-phosphate and a fructose tolerance test was also normal. A possible explanation for these findings is proposed.
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Affiliation(s)
- A G Catto-Smith
- Department of Gastroenterology, Royal Children's Hospital, Parkville, Victoria, Australia
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