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Park SS, Yang G, Kim E. Lactobacillus acidophilus NS1 Reduces Phosphoenolpyruvate Carboxylase Expression by Regulating HNF4α Transcriptional Activity. Korean J Food Sci Anim Resour 2017; 37:529-534. [PMID: 28943765 PMCID: PMC5599573 DOI: 10.5851/kosfa.2017.37.4.529] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2017] [Revised: 07/12/2017] [Accepted: 07/12/2017] [Indexed: 12/19/2022] Open
Abstract
Probiotics have been known to reduce high-fat diet (HFD)-induced metabolic diseases, such as obesity, insulin resistance, and type 2 diabetes. We recently observed that Lactobacillus acidophilus NS1 (LNS1), distinctly suppresses increase of blood glucose levels and insulin resistance in HFD-fed mice. In the present study, we demonstrated that oral administration of LNS1 with HFD feeding to mice significantly reduces hepatic expression of phosphoenolpyruvate carboxykinase (PEPCK), a key enzyme in gluconeogenesis which is highly increased by HFD feeding. This suppressive effect of LNS1 on hepatic expression of PEPCK was further confirmed in HepG2 cells by treatment of LNS1 conditioned media (LNS1-CM). LNS1-CM strongly and specifically inhibited HNF4α-induced PEPCK promoter activity in HepG2 cells without change of HNF4α mRNA levels. Together, these data demonstrate that LNS1 suppresses PEPCK expression in the liver by regulating HNF4α transcriptional activity, implicating its role as a preventive or therapeutic approach for metabolic diseases.
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Affiliation(s)
- Sung-Soo Park
- Department of Biological Sciences, College of Science, Chonnam National University, Gwangju 61186, Korea
| | - Garam Yang
- Department of Biological Sciences, College of Science, Chonnam National University, Gwangju 61186, Korea
| | - Eungseok Kim
- Department of Biological Sciences, College of Science, Chonnam National University, Gwangju 61186, Korea
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102
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Cabezas-Cruz A, Espinosa PJ, Obregón DA, Alberdi P, de la Fuente J. Ixodes scapularis Tick Cells Control Anaplasma phagocytophilum Infection by Increasing the Synthesis of Phosphoenolpyruvate from Tyrosine. Front Cell Infect Microbiol 2017; 7:375. [PMID: 28861402 PMCID: PMC5562928 DOI: 10.3389/fcimb.2017.00375] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Accepted: 08/04/2017] [Indexed: 01/14/2023] Open
Abstract
The obligate intracellular pathogen, Anaplasma phagocytophilum, is the causative agent of life-threatening diseases in humans and animals. A. phagocytophilum is an emerging tick-borne pathogen in the United States, Europe, Africa and Asia, with increasing numbers of infected people and animals every year. It is increasingly recognized that intracellular pathogens modify host cell metabolic pathways to increase infection and transmission in both vertebrate and invertebrate hosts. Recent reports have shown that amino acids are central to the host–pathogen metabolic interaction. In this study, a genome-wide search for components of amino acid metabolic pathways was performed in Ixodes scapularis, the main tick vector of A. phagocytophilum in the United States, for which the genome was recently published. The enzymes involved in the synthesis and degradation pathways of the twenty amino acids were identified. Then, the available transcriptomics and proteomics data was used to characterize the mRNA and protein levels of I. scapularis amino acid metabolic pathway components in response to A. phagocytophilum infection of tick tissues and ISE6 tick cells. Our analysis was focused on the interplay between carbohydrate and amino acid metabolism during A. phagocytophilum infection in ISE6 cells. The results showed that tick cells increase the synthesis of phosphoenolpyruvate (PEP) from tyrosine to control A. phagocytophilum infection. Metabolic pathway analysis suggested that this is achieved by (i) increasing the transcript and protein levels of mitochondrial phosphoenolpyruvate carboxykinase (PEPCK-M), (ii) shunting tyrosine into the tricarboxylic acid (TCA) cycle to increase fumarate and oxaloacetate which will be converted into PEP by PEPCK-M, and (iii) blocking all the pathways that use PEP downstream gluconeogenesis (i.e., de novo serine synthesis pathway (SSP), glyceroneogenesis and gluconeogenesis). While sequestering host PEP may be critical for this bacterium because it cannot actively carry out glycolysis to produce PEP, excess of this metabolite may be toxic for A. phagocytophilum. The present work provides a more comprehensive view of the major amino acid metabolic pathways involved in the response to pathogen infection in ticks, and provides the basis for further studies to develop novel strategies for the control of granulocytic anaplasmosis.
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Affiliation(s)
- Alejandro Cabezas-Cruz
- Biologie Moléculaire et Immunologie Parasitaires (BIPAR), Unité Mixte de Recherche (UMR), Institut National Recherche Agronomique, Agence Nationale Sécurité Sanitaire Alimentaire Nationale (ANSES), Ecole Nationale Vétérinaire d'Alfort, Université Paris-EstMaisons-Alfort, France.,Department of Parasitology, Faculty of Science, University of South BohemiaČeské Budějovice, Czechia.,Institute of Parasitology, Biology Center, Czech Academy of SciencesČeské Budějovice, Czechia
| | - Pedro J Espinosa
- SaBio, Instituto de Investigación en Recursos Cinegéticos IREC (CSIC-UCLM-JCCM)Ciudad Real, Spain
| | - Dasiel A Obregón
- Cell and Molecular Biology Laboratory, University of Sao PauloSao Paulo, Brazil
| | - Pilar Alberdi
- SaBio, Instituto de Investigación en Recursos Cinegéticos IREC (CSIC-UCLM-JCCM)Ciudad Real, Spain
| | - José de la Fuente
- SaBio, Instituto de Investigación en Recursos Cinegéticos IREC (CSIC-UCLM-JCCM)Ciudad Real, Spain.,Department of Veterinary Pathobiology, Center for Veterinary Health Sciences, Oklahoma State UniversityStillwater, OK, United States
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103
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Latorre P, Varona L, Burgos C, Carrodeguas JA, López-Buesa P. O-GlcNAcylation mediates the control of cytosolic phosphoenolpyruvate carboxykinase activity via Pgc1α. PLoS One 2017; 12:e0179988. [PMID: 28644880 PMCID: PMC5482481 DOI: 10.1371/journal.pone.0179988] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 06/07/2017] [Indexed: 11/19/2022] Open
Abstract
PGC1α is a coactivator of many transcription factors and cytosolic phosphoenolpyruvate carboxykinase (PCK1) is a key enzyme for gluconeogenesis. PGC1α interacts with the transcription factor PPARγ to stimulate PCK1 expression and thus de novo glucose synthesis. These proteins are not only important for central energy metabolism but also for supplying intermediates for other metabolic pathways, including lipidogenesis and protein synthesis and might therefore be important factors in the ethiopathogenesis of metabolic disorders like diabetes but also in other pathologies like cancer. Since polymorphisms in these proteins have been related to some phenotypic traits in animals like pigs and PGC1α G482S polymorphism increases fat deposition in humans, we have investigated the molecular basis of such effects focusing on a commonly studied polymorphism in pig Pgc1α, which changes a cysteine at position 430 (WT) of the protein to a serine (C430S). Biochemical analyses show that Pgc1α WT stimulates higher expression of human PCK1 in HEK293T and HepG2 cells. Paradoxically, Pgc1α WT is less stable than Pgc1α p.C430S in HEK293T cells. However, the study of different post-translational modifications shows a higher O-GlcNAcylation level of Pgc1α p.C430S. This higher O-GlcNAcylation level significantly decreases the interaction between Pgc1α and PPARγ demonstrating the importance of post-translational glycosylation of PGC1α in the regulation of PCK1 activity. This, furthermore, could explain at least in part the observed epistatic effects between PGC1α and PCK1 in pigs.
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Affiliation(s)
- Pedro Latorre
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFIIQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
| | - Luis Varona
- Departamento de Anatomía, Embriología y Genética, Universidad de Zaragoza, Zaragoza, Spain
- Instituto Agroalimentario de Aragón (IA2), Zaragoza, Spain
| | - Carmen Burgos
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFIIQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
| | - José A. Carrodeguas
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFIIQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
- Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, Zaragoza, Spain
- IIS Aragón, Zaragoza, Spain
| | - Pascual López-Buesa
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFIIQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
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104
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Genzer Y, Chapnik N, Froy O. Effect of brain-derived neurotrophic factor (BDNF) on hepatocyte metabolism. Int J Biochem Cell Biol 2017; 88:69-74. [PMID: 28483667 DOI: 10.1016/j.biocel.2017.05.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Revised: 03/28/2017] [Accepted: 05/04/2017] [Indexed: 12/15/2022]
Abstract
Brain-derived neurotrophic factor (BDNF) plays crucial roles in the development, maintenance, plasticity and homeostasis of the central and peripheral nervous systems. Perturbing BDNF signaling in mouse brain results in hyperphagia, obesity, hyperinsulinemia and hyperglycemia. Currently, little is known whether BDNF affects liver tissue directly. Our aim was to determine the metabolic signaling pathways activated after BDNF treatment in hepatocytes. Unlike its effect in the brain, BDNF did not lead to activation of the liver AKT pathway. However, AMP protein activated kinase (AMPK) was ∼3 times more active and fatty acid synthase (FAS) ∼2-fold less active, suggesting increased fatty acid oxidation and reduced fatty acid synthesis. In addition, cAMP response element binding protein (CREB) was ∼3.5-fold less active together with its output the gluconeogenic transcript phosphoenolpyruvate carboxykinase (Pepck), suggesting reduced gluconeogenesis. The levels of glycogen synthase kinase 3b (GSK3b) was ∼3-fold higher suggesting increased glycogen synthesis. In parallel, the expression levels of the clock genes Bmal1 and Cry1, whose protein products play also a metabolic role, were ∼2-fold increased and decreased, respectively. In conclusion, BDNF binding to hepatocytes leads to activation of catabolic pathways, such as fatty acid oxidation. In parallel gluconeogenesis is inhibited, while glycogen storage is triggered. This metabolic state mimics that of after breakfast, in which the liver continues to oxidize fat, stops gluconeogenesis and replenishes glycogen stores.
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Affiliation(s)
- Yoni Genzer
- Institute of Biochemistry, Food Science and Nutrition, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
| | - Nava Chapnik
- Institute of Biochemistry, Food Science and Nutrition, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel
| | - Oren Froy
- Institute of Biochemistry, Food Science and Nutrition, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot 76100, Israel.
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105
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Vieira P, Cameron J, Rahikkala E, Keski-Filppula R, Zhang LH, Santra S, Matthews A, Myllynen P, Nuutinen M, Moilanen JS, Rodenburg RJ, Rolfs A, Uusimaa J, van Karnebeek CDM. Novel homozygous PCK1 mutation causing cytosolic phosphoenolpyruvate carboxykinase deficiency presenting as childhood hypoglycemia, an abnormal pattern of urine metabolites and liver dysfunction. Mol Genet Metab 2017; 120:337-341. [PMID: 28216384 DOI: 10.1016/j.ymgme.2017.02.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2016] [Revised: 02/03/2017] [Accepted: 02/04/2017] [Indexed: 11/16/2022]
Abstract
Clinical and laboratory data were collected from three Finnish patients including a sibling pair and another unrelated child with unexplained childhood hypoglycemia. Transient elevation of alanine transaminase, lactate and tricarboxylic acid cycle intermediates, especially fumarate, were noticed in urine organic acid analysis. Exome sequencing was performed for the patients and their parents. A novel homozygous PCK1 c.925G>A (p.G309R) mutation was detected in all affected individuals. COS-1 cells transfected with mutant PCK1 transcripts were used to study the pathogenic nature of the detected variant. The COS-1 transfected cells showed the mutant gene to be incapable of producing a normally functioning cytosolic phosphoenolpyruvate carboxykinase (PEPCK) enzyme. This report further delineates the clinical phenotype of isolated cytosolic PEPCK deficiency and offers a metabolic pattern helping to recognize these patients. Cytosolic PEPCK deficiency should be considered in the differential diagnosis of children presenting with hypoglycemia, hepatic dysfunction and elevated tricarboxylic acid intermediates in urinary organic acid analysis.
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Affiliation(s)
- Päivi Vieira
- PEDEGO Research Unit, University of Oulu, Clinic for Children and Adolescents, Oulu University Hospital, Oulu, Finland.
| | - Jessie Cameron
- Genetics and Genome Biology, Peter Gilgan Center for Research and Learning, 686 Bay Street, Toronto, Ontario M5G0A4, Canada
| | - Elisa Rahikkala
- PEDEGO Research Unit, Clinical Genetics, University of Oulu, Medical Research Center Oulu, Department of Clinical Genetics, Oulu University Hospital, Oulu, Finland
| | - Riikka Keski-Filppula
- PEDEGO Research Unit, Clinical Genetics, University of Oulu, Medical Research Center Oulu, Department of Clinical Genetics, Oulu University Hospital, Oulu, Finland
| | - Lin-Hua Zhang
- Department of Pediatrics, Centre for Molecular Medicine and Therapeutics, BC Children's Hospital Research Institute, University of British Columbia, Vancouver, Canada
| | - Saikat Santra
- Department of Clinical Inherited Metabolic Disorders, Birmingham Children's Hospital, Steelhouse Lane, Birmingham B4 6NH, United Kingdom
| | - Allison Matthews
- Department of Pediatrics, Centre for Molecular Medicine and Therapeutics, BC Children's Hospital Research Institute, University of British Columbia, Vancouver, Canada
| | - Päivi Myllynen
- Northern Finland Laboratory Centre Nordlab, Oulu University Hospital, Oulu, Finland
| | - Matti Nuutinen
- PEDEGO Research Unit, University of Oulu, Clinic for Children and Adolescents, Oulu University Hospital, Oulu, Finland
| | - Jukka S Moilanen
- PEDEGO Research Unit, Clinical Genetics, University of Oulu, Medical Research Center Oulu, Department of Clinical Genetics, Oulu University Hospital, Oulu, Finland
| | - Richard J Rodenburg
- Radboud Center for Mitochondrial Medicine, Department of Pediatrics, Translational Metabolic Laboratory, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Arndt Rolfs
- Centogene AG, The Rare Disease Company, Rostock, Germany; Albrecht Kossel Institute for Neuroregeneration, University of Rostock, Germany
| | - Johanna Uusimaa
- PEDEGO Research Unit, University of Oulu, Clinic for Children and Adolescents, Oulu University Hospital, Oulu, Finland; Medical Research Center Oulu and Biocenter Oulu, University of Oulu, Finland
| | - Clara D M van Karnebeek
- Department of Pediatrics, Centre for Molecular Medicine and Therapeutics, BC Children's Hospital Research Institute, University of British Columbia, Vancouver, Canada; Department of Pediatrics, Emma Children's Hospital, Academic Medical Centre, Amsterdam, The Netherlands
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106
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Lie AAY, Liu Z, Terrado R, Tatters AO, Heidelberg KB, Caron DA. Effect of light and prey availability on gene expression of the mixotrophic chrysophyte, Ochromonas sp. BMC Genomics 2017; 18:163. [PMID: 28196482 PMCID: PMC5310065 DOI: 10.1186/s12864-017-3549-1] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 02/02/2017] [Indexed: 12/21/2022] Open
Abstract
Background Ochromonas is a genus of mixotrophic chrysophytes that is found ubiquitously in many aquatic environments. Species in this genus can be important consumers of bacteria but vary in their ability to perform photosynthesis. We studied the effect of light and bacteria on growth and gene expression of a predominantly phagotrophic Ochromonas species. Axenic cultures of Ochromonas sp. were fed with heat-killed bacteria (HKB) and grown in constant light or darkness. RNA was extracted from cultures in the light or in the dark with HKB present (Light + HKB; Dark + HKB), and in the light after HKB were depleted (Light + depleted HKB). Results There were no significant differences in the growth or bacterial ingestion rates between algae grown in light or dark conditions. The availability of light led to a differential expression of only 8% of genes in the transcriptome. A number of genes associated with photosynthesis, phagotrophy, and tetrapyrrole synthesis was upregulated in the Light + HKB treatment compared to Dark + HKB. Conversely, the comparison between the Light + HKB and Light + depleted HKB treatments revealed that the presence of HKB led to differential expression of 59% of genes, including the majority of genes involved in major carbon and nitrogen metabolic pathways. Genes coding for unidirectional enzymes for the utilization of glucose were upregulated in the presence of HKB, implying increased glycolytic activities during phagotrophy. Algae without HKB upregulated their expression of genes coding for ammonium transporters, implying uptake of inorganic nitrogen from the culture medium when prey were unavailable. Conclusions Transcriptomic results agreed with previous observations that light had minimal effect on the population growth of Ochromonas sp. However, light led to the upregulation of a number of phototrophy- and phagotrophy-related genes, while the availability of bacterial prey led to prominent changes in major carbon and nitrogen metabolic pathways. Our study demonstrated the potential of transcriptomic approaches to improve our understanding of the trophic physiologies of complex mixotrophs, and revealed responses in Ochromonas sp. not apparent from traditional culture studies. Electronic supplementary material The online version of this article (doi:10.1186/s12864-017-3549-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Alle A Y Lie
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Parkway, Los Angeles, CA, 90089-0371, USA.
| | - Zhenfeng Liu
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Parkway, Los Angeles, CA, 90089-0371, USA
| | - Ramon Terrado
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Parkway, Los Angeles, CA, 90089-0371, USA
| | - Avery O Tatters
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Parkway, Los Angeles, CA, 90089-0371, USA
| | - Karla B Heidelberg
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Parkway, Los Angeles, CA, 90089-0371, USA
| | - David A Caron
- Department of Biological Sciences, University of Southern California, 3616 Trousdale Parkway, Los Angeles, CA, 90089-0371, USA
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107
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Lau DS, Connaty AD, Mahalingam S, Wall N, Cheviron ZA, Storz JF, Scott GR, McClelland GB. Acclimation to hypoxia increases carbohydrate use during exercise in high-altitude deer mice. Am J Physiol Regul Integr Comp Physiol 2017; 312:R400-R411. [PMID: 28077391 DOI: 10.1152/ajpregu.00365.2016] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 12/13/2016] [Accepted: 01/05/2017] [Indexed: 12/24/2022]
Abstract
The low O2 experienced at high altitude is a significant challenge to effective aerobic locomotion, as it requires sustained tissue O2 delivery in addition to the appropriate allocation of metabolic substrates. Here, we tested whether high- and low-altitude deer mice (Peromyscus maniculatus) have evolved different acclimation responses to hypoxia with respect to muscle metabolism and fuel use during submaximal exercise. Using F1 generation high- and low-altitude deer mice that were born and raised in common conditions, we assessed 1) fuel use during exercise, 2) metabolic enzyme activities, and 3) gene expression for key transporters and enzymes in the gastrocnemius. After hypoxia acclimation, highland mice showed a significant increase in carbohydrate oxidation and higher relative reliance on this fuel during exercise at 75% maximal O2 consumption. Compared with lowland mice, highland mice had consistently higher activities of oxidative and fatty acid oxidation enzymes in the gastrocnemius. In contrast, only after hypoxia acclimation did activities of hexokinase increase significantly in the muscle of highland mice to levels greater than lowland mice. Highland mice also responded to acclimation with increases in muscle gene expression for hexokinase 1 and 2 genes, whereas both populations increased mRNA expression for glucose transporters. Changes in skeletal muscle with acclimation suggest that highland mice had an increased capacity for the uptake and oxidation of circulatory glucose. Our results demonstrate that highland mice have evolved a distinct mode of hypoxia acclimation that involves an increase in carbohydrate use during exercise.
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Affiliation(s)
- Daphne S Lau
- Department of Biology, McMaster University, Hamilton, Ontario, Canada
| | - Alex D Connaty
- Department of Biology, McMaster University, Hamilton, Ontario, Canada
| | - Sajeni Mahalingam
- Department of Biology, McMaster University, Hamilton, Ontario, Canada
| | - Nastashya Wall
- Department of Biology, McMaster University, Hamilton, Ontario, Canada
| | - Zachary A Cheviron
- Division of Biological Sciences, University of Montana, Missoula, Montana; and
| | - Jay F Storz
- School of Biological Sciences, University of Nebraska, Lincoln, Nebraska
| | - Graham R Scott
- Department of Biology, McMaster University, Hamilton, Ontario, Canada
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108
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Luizon MR, Eckalbar WL, Wang Y, Jones SL, Smith RP, Laurance M, Lin L, Gallins PJ, Etheridge AS, Wright F, Zhou Y, Molony C, Innocenti F, Yee SW, Giacomini KM, Ahituv N. Genomic Characterization of Metformin Hepatic Response. PLoS Genet 2016; 12:e1006449. [PMID: 27902686 PMCID: PMC5130177 DOI: 10.1371/journal.pgen.1006449] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Accepted: 10/25/2016] [Indexed: 12/26/2022] Open
Abstract
Metformin is used as a first-line therapy for type 2 diabetes (T2D) and prescribed for numerous other diseases. However, its mechanism of action in the liver has yet to be characterized in a systematic manner. To comprehensively identify genes and regulatory elements associated with metformin treatment, we carried out RNA-seq and ChIP-seq (H3K27ac, H3K27me3) on primary human hepatocytes from the same donor treated with vehicle control, metformin or metformin and compound C, an AMP-activated protein kinase (AMPK) inhibitor (allowing to identify AMPK-independent pathways). We identified thousands of metformin responsive AMPK-dependent and AMPK-independent differentially expressed genes and regulatory elements. We functionally validated several elements for metformin-induced promoter and enhancer activity. These include an enhancer in an ataxia telangiectasia mutated (ATM) intron that has SNPs in linkage disequilibrium with a metformin treatment response GWAS lead SNP (rs11212617) that showed increased enhancer activity for the associated haplotype. Expression quantitative trait locus (eQTL) liver analysis and CRISPR activation suggest that this enhancer could be regulating ATM, which has a known role in AMPK activation, and potentially also EXPH5 and DDX10, its neighboring genes. Using ChIP-seq and siRNA knockdown, we further show that activating transcription factor 3 (ATF3), our top metformin upregulated AMPK-dependent gene, could have an important role in gluconeogenesis repression. Our findings provide a genome-wide representation of metformin hepatic response, highlight important sequences that could be associated with interindividual variability in glycemic response to metformin and identify novel T2D treatment candidates. Metformin is among the most widely prescribed drugs. It is used as a first line therapy for type 2 diabetes (T2D), and for additional diseases including cancer. The variability in response to metformin is substantial and can be caused by genetic factors. However, the molecular mechanisms of metformin action are not fully known. Here, we used various genomic assays to analyze human liver cells treated with or without metformin and identified in a genome-wide manner thousands of differentially expressed genes and gene regulatory elements affected by metformin. Follow up functional assays identified several novel genes and regulatory elements to be associated with metformin response. These include ATF3, a gene that showed gluconeogenesis repression upon metformin response and a potential regulatory element of the ATM gene that is associated with metformin treatment differences through genome-wide association studies. Combined, this work identifies several novel genes and gene regulatory elements that can be activated due to metformin treatment and thus provides candidate sequences in the human genome where nucleotide variation can lead to differences in metformin response. It also enables the identification and prioritization of novel candidates for T2D treatment.
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Affiliation(s)
- Marcelo R. Luizon
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
- Institute for Human Genetics, University of California San Francisco, San Francisco, California, United States of America
- Department of General Biology, Institute of Biological Sciences, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Walter L. Eckalbar
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
- Institute for Human Genetics, University of California San Francisco, San Francisco, California, United States of America
| | - Yao Wang
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
- Institute for Human Genetics, University of California San Francisco, San Francisco, California, United States of America
- School of Pharmaceutical Sciences, Tsinghua University, Beijing, China
| | - Stacy L. Jones
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
- Institute for Human Genetics, University of California San Francisco, San Francisco, California, United States of America
| | - Robin P. Smith
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
- Institute for Human Genetics, University of California San Francisco, San Francisco, California, United States of America
| | - Megan Laurance
- Library and Center for Knowledge Management, University of California San Francisco, San Francisco, California, United States of America
| | - Lawrence Lin
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
| | - Paul J. Gallins
- Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Amy S. Etheridge
- Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Fred Wright
- Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Yihui Zhou
- Bioinformatics Research Center, North Carolina State University, Raleigh, North Carolina, United States of America
| | - Cliona Molony
- Merck Research Labs, Merck & Co. Inc., Kenilworth, New Jersey, United States of America
| | - Federico Innocenti
- Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States of America
| | - Sook Wah Yee
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
| | - Kathleen M. Giacomini
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
- Institute for Human Genetics, University of California San Francisco, San Francisco, California, United States of America
| | - Nadav Ahituv
- Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, California, United States of America
- Institute for Human Genetics, University of California San Francisco, San Francisco, California, United States of America
- * E-mail:
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109
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Feigerlová E, Battaglia-Hsu SF. Role of post-transcriptional regulation of mRNA stability in renal pathophysiology: focus on chronic kidney disease. FASEB J 2016; 31:457-468. [PMID: 27849555 DOI: 10.1096/fj.201601087rr] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Accepted: 11/07/2016] [Indexed: 11/11/2022]
Abstract
Chronic kidney disease (CKD) represents an important public health problem. Its progression to end-stage renal disease is associated with increased morbidity and mortality. The determinants of renal function decline are not fully understood. Recent progress in the understanding of post-transcriptional regulation of mRNA stability has helped the identification of both the trans- and cis-acting elements of mRNA as potential markers and therapeutic targets for difficult-to-diagnose and -treat diseases, including CKDs such as diabetic nephropathy. Human antigen R (HuR), a trans-acting element of mRNA, is an RNA binding factor (RBF) best known for its ability to stabilize AU-rich-element-containing mRNAs. Deregulated HuR subcellular localization or expression occurs in a wide range of renal diseases, such as metabolic acidosis, ischemia, and fibrosis. Besides RBFs, recent evidence revealed that noncoding RNA, such as microRNA and long noncoding RNA, participates in regulating mRNA stability and that aberrant noncoding RNA expression accounts for many pathologic renal conditions. The goal of this review is to provide an overview of our current understanding of the post-transcriptional regulation of mRNA stability in renal pathophysiology and to offer perspectives for this class of diseases. We use examples of diverse renal diseases to illustrate different mRNA stability pathways in specific cellular compartments and discuss the roles and impacts of both the cis- and trans-activating factors on the regulation of mRNA stability in these diseases.-Feigerlová, E., Battaglia-Hsu, S.-F. Role of post-transcriptional regulation of mRNA stability in renal pathophysiology: focus on chronic kidney disease.
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Affiliation(s)
- Eva Feigerlová
- Service d'Endocrinologie, Centre Hospitalier Universitaire de Poitiers, Pôle DUNE, Poitiers, France; .,Université de Poitiers, Unité de Formation et de Recherche Médecine Pharmacie, Poitiers, France.,Clinical Investigation Centre 1402, Unité 1082, INSERM, Poitiers, France; and
| | - Shyue-Fang Battaglia-Hsu
- Nutrition Génétique et Exposition aux Risques Environnementaux, INSERM Unité 954, Université de Lorraine et Centre Hospitalier Regional Universitaire de Nancy, Vandœuvre les Nancy, France
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110
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Wesolowski SR, Hay WW. Role of placental insufficiency and intrauterine growth restriction on the activation of fetal hepatic glucose production. Mol Cell Endocrinol 2016; 435:61-68. [PMID: 26723529 PMCID: PMC4921201 DOI: 10.1016/j.mce.2015.12.016] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2015] [Revised: 12/16/2015] [Accepted: 12/18/2015] [Indexed: 02/07/2023]
Abstract
Glucose is the major fuel for fetal oxidative metabolism. A positive maternal-fetal glucose gradient drives glucose across the placenta and is sufficient to meet the demands of the fetus, eliminating the need for endogenous hepatic glucose production (HGP). However, fetuses with intrauterine growth restriction (IUGR) from pregnancies complicated by placental insufficiency have an early activation of HGP. Furthermore, this activated HGP is resistant to suppression by insulin. Here, we present the data demonstrating the activation of HGP in animal models, mostly fetal sheep, and human pregnancies with IUGR. We also discuss potential mechanisms and pathways that may produce and support HGP and hepatic insulin resistance in IUGR fetuses.
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Affiliation(s)
- Stephanie R Wesolowski
- Perinatal Research Center, Department of Pediatrics, University of Colorado School of Medicine, Colorado Anschutz Medical Campus, Aurora, CO, USA.
| | - William W Hay
- Perinatal Research Center, Department of Pediatrics, University of Colorado School of Medicine, Colorado Anschutz Medical Campus, Aurora, CO, USA
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111
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PEPCK-C reexpression in the liver counters neonatal hypoglycemia in Pck1 del/del mice, unmasking role in non-gluconeogenic tissues. J Physiol Biochem 2016; 73:89-98. [PMID: 27785616 DOI: 10.1007/s13105-016-0528-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 10/05/2016] [Indexed: 12/27/2022]
Abstract
Whole body cytosolic phosphoenolpyruvate carboxykinase knockout (PEPCK-C KO) mice die early after birth with profound hypoglycemia therefore masking the role of PEPCK-C in adult, non-gluconeogenic tissues where it is expressed. To investigate whether PEPCK-C deletion in the liver was critically responsible for the hypoglycemic phenotype, we reexpress this enzyme in the liver of PEPCK-C KO pups by early postnatal administration of PEPCK-C-expressing adenovirus. This maneuver was sufficient to partially rescue hypoglycemia and allow the pups to survive and identifies the liver as a critical organ, and hypoglycemia as the critical pathomechanism, leading to early postnatal death in the whole-body PEPCK-C knockout mice. Pathology assessment of survivors also suggest a possible role for PEPCK-C in lung maturation and muscle metabolism.
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112
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Gadupudi GS, Klingelhutz AJ, Robertson LW. Diminished Phosphorylation of CREB Is a Key Event in the Dysregulation of Gluconeogenesis and Glycogenolysis in PCB126 Hepatotoxicity. Chem Res Toxicol 2016; 29:1504-9. [PMID: 27509375 DOI: 10.1021/acs.chemrestox.6b00172] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The dioxin-like PCB126 elicits toxicity in various target organs. In rat liver, an alteration in the transcript levels of several genes involved in glucose and fatty acid metabolism provides insights into the origin of its hepatotoxicity. To explore the mechanisms, male Sprague-Dawley rats, fed an AIN-93G diet, were injected with PCB126 (1 or 5 μmol/kg) or corn oil and euthanized after 2 weeks. PCB126 significantly decreased serum glucose levels and the transcript levels of genes of many gluconeogenic and glycogenolytic enzymes under the transcriptional control of a nuclear transcription factor, cAMP response element-binding protein (CREB). As a novel finding, we show that PCB126 significantly decreases CREB phosphorylation, which is important for regulating both gluconeogenesis and fatty acid oxidation in the liver and explains CREB's integrative effects on both carbohydrate and lipid metabolism in PCB126 toxicity.
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Affiliation(s)
- Gopi S Gadupudi
- Interdisciplinary Graduate Program in Human Toxicology and Department of Occupational and Environmental Health, University of Iowa , Iowa City, Iowa 52242, United States
| | | | - Larry W Robertson
- Interdisciplinary Graduate Program in Human Toxicology and Department of Occupational and Environmental Health, University of Iowa , Iowa City, Iowa 52242, United States
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113
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Hidalgo J, Latorre P, Carrodeguas JA, Velázquez-Campoy A, Sancho J, López-Buesa P. Inhibition of Pig Phosphoenolpyruvate Carboxykinase Isoenzymes by 3-Mercaptopicolinic Acid and Novel Inhibitors. PLoS One 2016; 11:e0159002. [PMID: 27391465 PMCID: PMC4938538 DOI: 10.1371/journal.pone.0159002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 06/25/2016] [Indexed: 11/24/2022] Open
Abstract
There exist two isoforms of cytosolic phosphoenolpyruvate carboxykinase (PEPCK-C) in pig populations that differ in a single amino acid (Met139Leu). The isoenzymes have different kinetic properties, affecting more strongly the Km and Vmax of nucleotides. They are associated to different phenotypes modifying traits of considerable economic interest. In this work we use inhibitors of phosphoenolpyruvate carboxykinase activity to search for further differences between these isoenzymes. On the one hand we have used the well-known inhibitor 3-mercaptopicolinic acid. Its inhibition patterns were the same for both isoenzymes: a three-fold decrease of the Ki values for GTP in 139Met and 139Leu (273 and 873 μM, respectively). On the other hand, through screening of a chemical library we have found two novel compounds with inhibitory effects of a similar magnitude to that of 3-mercaptopicolinic acid but with less solubility and specificity. One of these novel compounds, (N'1-({5-[1-methyl-5-(trifluoromethyl)-1H-pyrazol-3-yl]-2-thienyl}methylidene)-2,4-dichlorobenzene-1-carbohydrazide), exhibited significantly different inhibitory effects on either isoenzyme: it enhanced threefold the apparent Km value for GTP in 139Met, whereas in 139Leu, it reduced it from 99 to 69 μM. The finding of those significant differences in the binding of GTP reinforces the hypothesis that the Met139Leu substitution affects strongly the nucleotide binding site of PEPCK-C.
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Affiliation(s)
- Jorge Hidalgo
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFI-IQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
| | - Pedro Latorre
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFI-IQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
| | - José Alberto Carrodeguas
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFI-IQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
- Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, Zaragoza, Spain
- IIS Aragón, Zaragoza, Spain
| | - Adrián Velázquez-Campoy
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFI-IQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
- Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, Zaragoza, Spain
- IIS Aragón, Zaragoza, Spain
- Fundación ARAID, Government of Aragón, Zaragoza, Spain
| | - Javier Sancho
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFI-IQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
- Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, Zaragoza, Spain
- IIS Aragón, Zaragoza, Spain
| | - Pascual López-Buesa
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, Zaragoza, Spain
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFI-IQFR (CSIC) Joint Unit, Universidad de Zaragoza, Zaragoza, Spain
- * E-mail:
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114
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Brown DM, Williams H, Ryan KJP, Wilson TL, Daniel ZCTR, Mareko MHD, Emes RD, Harris DW, Jones S, Wattis JAD, Dryden IL, Hodgman TC, Brameld JM, Parr T. Mitochondrial phosphoenolpyruvate carboxykinase (PEPCK-M) and serine biosynthetic pathway genes are co-ordinately increased during anabolic agent-induced skeletal muscle growth. Sci Rep 2016; 6:28693. [PMID: 27350173 PMCID: PMC4923900 DOI: 10.1038/srep28693] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 06/08/2016] [Indexed: 02/04/2023] Open
Abstract
We aimed to identify novel molecular mechanisms for muscle growth during administration of anabolic agents. Growing pigs (Duroc/(Landrace/Large-White)) were administered Ractopamine (a beta-adrenergic agonist; BA; 20 ppm in feed) or Reporcin (recombinant growth hormone; GH; 10 mg/48 hours injected) and compared to a control cohort (feed only; no injections) over a 27-day time course (1, 3, 7, 13 or 27-days). Longissimus Dorsi muscle gene expression was analyzed using Agilent porcine transcriptome microarrays and clusters of genes displaying similar expression profiles were identified using a modified maSigPro clustering algorithm. Anabolic agents increased carcass (p = 0.002) and muscle weights (Vastus Lateralis: p < 0.001; Semitendinosus: p = 0.075). Skeletal muscle mRNA expression of serine/one-carbon/glycine biosynthesis pathway genes (Phgdh, Psat1 and Psph) and the gluconeogenic enzyme, phosphoenolpyruvate carboxykinase-M (Pck2/PEPCK-M), increased during treatment with BA, and to a lesser extent GH (p < 0.001, treatment x time interaction). Treatment with BA, but not GH, caused a 2-fold increase in phosphoglycerate dehydrogenase (PHGDH) protein expression at days 3 (p < 0.05) and 7 (p < 0.01), and a 2-fold increase in PEPCK-M protein expression at day 7 (p < 0.01). BA treated pigs exhibit a profound increase in expression of PHGDH and PEPCK-M in skeletal muscle, implicating a role for biosynthetic metabolic pathways in muscle growth.
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Affiliation(s)
- D M Brown
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
| | - H Williams
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK.,School of Mathematical Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - K J P Ryan
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
| | - T L Wilson
- VMRD Global Therapeutics Research, Zoetis, Kalamazoo, MI, 49007, USA
| | - Z C T R Daniel
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
| | - M H D Mareko
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
| | - R D Emes
- School of Veterinary Medicine and Science, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
| | - D W Harris
- VMRD Global Therapeutics Research, Zoetis, Kalamazoo, MI, 49007, USA
| | - S Jones
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
| | - J A D Wattis
- School of Mathematical Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - I L Dryden
- School of Mathematical Sciences, University of Nottingham, University Park, Nottingham NG7 2RD, UK
| | - T C Hodgman
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
| | - J M Brameld
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
| | - T Parr
- School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
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115
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Eveland M, Brokamp GA, Lue CH, Harbison ST, Leips J, De Luca M. Knockdown expression of Syndecan in the fat body impacts nutrient metabolism and the organismal response to environmental stresses in Drosophila melanogaster. Biochem Biophys Res Commun 2016; 477:103-108. [PMID: 27289019 DOI: 10.1016/j.bbrc.2016.06.027] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 06/07/2016] [Indexed: 11/18/2022]
Abstract
The heparan sulfate proteoglycan syndecans are transmembrane proteins involved in multiple physiological processes, including cell-matrix adhesion and inflammation. Recent evidence from model systems and humans suggest that syndecans have a role in energy balance and nutrient metabolism regulation. However, much remains to be learned about the mechanisms through which syndecans influence these phenotypes. Previously, we reported that Drosophila melanogaster Syndecan (Sdc) mutants had reduced metabolic activity compared to controls. Here, we knocked down endogenous Sdc expression in the fat body (the functional equivalent of mammalian adipose tissue and liver) to investigate whether the effects on metabolism originate from this tissue. We found that knocking down Sdc in the fat body leads to flies with higher levels of glycogen and fat and that survive longer during starvation, likely due to their extra energy reserves and an increase in gluconeogenesis. However, compared to control flies, they are also more sensitive to environmental stresses (e.g. bacterial infection and cold) and have reduced metabolic activity under normal feeding conditions. Under the same conditions, fat-body Sdc reduction enhances expression of genes involved in glyceroneogenesis and gluconeogenesis and induces a drastic decrease in phosphorylation levels of AKT and extracellular signal regulated kinase 1/2 (ERK1/2). Altogether, these findings strongly suggest that Drosophila fat body Sdc is involved in a mechanism that shifts resources to different physiological functions according to nutritional status.
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Affiliation(s)
- Matthew Eveland
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Gabrielle A Brokamp
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Chia-Hua Lue
- Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD, USA
| | - Susan T Harbison
- Laboratory of Systems Genetics, National Heart Lung and Blood Institute, Bethesda, MD, USA
| | - Jeff Leips
- Department of Biological Sciences, University of Maryland Baltimore County, Baltimore, MD, USA
| | - Maria De Luca
- Department of Nutrition Sciences, University of Alabama at Birmingham, Birmingham, AL, USA.
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116
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Escós M, Latorre P, Hidalgo J, Hurtado-Guerrero R, Carrodeguas JA, López-Buesa P. Kinetic and functional properties of human mitochondrial phosphoenolpyruvate carboxykinase. Biochem Biophys Rep 2016; 7:124-129. [PMID: 28955899 PMCID: PMC5613351 DOI: 10.1016/j.bbrep.2016.06.007] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 06/02/2016] [Accepted: 06/06/2016] [Indexed: 11/28/2022] Open
Abstract
The cytosolic form of phosphoenolpyruvate carboxykinase (PCK1) plays a regulatory role in gluconeogenesis and glyceroneogenesis. The role of the mitochondrial isoform (PCK2) remains unclear. We report the partial purification and kinetic and functional characterization of human PCK2. Kinetic properties of the enzyme are very similar to those of the cytosolic enzyme. PCK2 has an absolute requirement for Mn2+ ions for activity; Mg2+ ions reduce the Km for Mn2+ by about 60 fold. Its specificity constant is 100 fold larger for oxaloacetate than for phosphoenolpyruvate suggesting that oxaloacetate phosphorylation is the favored reaction in vivo. The enzyme possesses weak pyruvate kinase-like activity (kcat=2.7 s−1). When overexpressed in HEK293T cells it enhances strongly glucose and lipid production showing that it can play, as the cytosolic isoenzyme, an active role in glyceroneogenesis and gluconeogenesis. Purification of recombinant human PCK2 has been performed. Its kinetic behavior is very similar to that of human PCK1. PCK2 overexpression increases gluconeogenesis and glyceroneogenesis in cell cultures.
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Affiliation(s)
- Miriam Escós
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFI-IQFR (CSIC) Joint Unit, Universidad de Zaragoza, 50009 Zaragoza, Aragón, Spain
| | - Pedro Latorre
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, 50013 Zaragoza, Spain.,Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFI-IQFR (CSIC) Joint Unit, Universidad de Zaragoza, 50009 Zaragoza, Aragón, Spain
| | - Jorge Hidalgo
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, 50013 Zaragoza, Spain.,Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFI-IQFR (CSIC) Joint Unit, Universidad de Zaragoza, 50009 Zaragoza, Aragón, Spain
| | - Ramón Hurtado-Guerrero
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFI-IQFR (CSIC) Joint Unit, Universidad de Zaragoza, 50009 Zaragoza, Aragón, Spain.,Fundación ARAID, Gobierno de Aragón, Zaragoza, Spain
| | - José Alberto Carrodeguas
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFI-IQFR (CSIC) Joint Unit, Universidad de Zaragoza, 50009 Zaragoza, Aragón, Spain.,Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain.,IIS Aragón, 50009 Zaragoza, Spain
| | - Pascual López-Buesa
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, 50013 Zaragoza, Spain.,Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), BIFI-IQFR (CSIC) Joint Unit, Universidad de Zaragoza, 50009 Zaragoza, Aragón, Spain
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117
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Santra S, Cameron JM, Shyr C, Zhang L, Drögemöller B, Ross CJ, Wasserman WW, Wevers RA, Rodenburg RJ, Gupte G, Preece MA, van Karnebeek CD. Cytosolic phosphoenolpyruvate carboxykinase deficiency presenting with acute liver failure following gastroenteritis. Mol Genet Metab 2016; 118:21-7. [PMID: 26971250 DOI: 10.1016/j.ymgme.2016.03.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Revised: 03/03/2016] [Accepted: 03/03/2016] [Indexed: 11/25/2022]
Abstract
We report a patient from a consanguineous family who presented with transient acute liver failure and biochemical patterns suggestive of disturbed urea cycle and mitochondrial function, for whom conventional genetic and metabolic investigations for acute liver failure failed to yield a diagnosis. Whole exome sequencing revealed a homozygous 12-bp deletion in PCK1 (MIM 614168) encoding cytosolic phosphoenolpyruvate carboxykinase (PEPCK); enzymatic studies subsequently confirmed its pathogenic nature. We propose that PEPCK deficiency should be considered in the young child with unexplained liver failure, especially where there are marked, accumulations of TCA cycle metabolites on urine organic acid analysis and/or an amino acid profile with hyperammonaemia suggestive of a proximal urea cycle defect during the acute episode. If suspected, intravenous administration of dextrose should be initiated. Long-term management comprising avoidance of fasting with the provision of a glucose polymer emergency regimen for illness management may be sufficient to prevent future episodes of liver failure. This case report provides further insights into the (patho-)physiology of energy metabolism, confirming the power of genomic analysis of unexplained biochemical phenotypes.
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Affiliation(s)
| | - Jessie M Cameron
- Genetics and Genome Biology Program, Peter Gilgan Centre for Research and Learning, Toronto, Canada
| | - Casper Shyr
- Centre for Molecular Medicine, Child & Family Research Institute, Vancouver, Canada
| | - Linhua Zhang
- Centre for Molecular Medicine, Child & Family Research Institute, Vancouver, Canada; Department of Pediatrics, University of British Columbia, Canada
| | - Britt Drögemöller
- Department of Medical Genetics, University of British Columbia, Vancouver, Canada
| | - Colin J Ross
- Department of Medical Genetics, University of British Columbia, Vancouver, Canada; Centre for Molecular Medicine, Child & Family Research Institute, Vancouver, Canada; Department of Pediatrics, University of British Columbia, Canada
| | - Wyeth W Wasserman
- Department of Medical Genetics, University of British Columbia, Vancouver, Canada; Centre for Molecular Medicine, Child & Family Research Institute, Vancouver, Canada
| | - Ron A Wevers
- Department of Laboratory Medicine - Translational Metabolic Laboratory, Radboudumc, Nijmegen, The Netherlands
| | - Richard J Rodenburg
- Nijmegen Center for Mitochondrial Disorders, Department of Pediatrics, Translational Metabolic Laboratory, Radboud University Nijmegen Medical Center, Nijmegen, The Netherlands
| | | | | | - Clara D van Karnebeek
- Centre for Molecular Medicine, Child & Family Research Institute, Vancouver, Canada; Department of Pediatrics, University of British Columbia, Canada.
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118
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Speers-Roesch B, Callaghan NI, MacCormack TJ, Lamarre SG, Sykes AV, Driedzic WR. Enzymatic capacities of metabolic fuel use in cuttlefish (Sepia officinalis) and responses to food deprivation: insight into the metabolic organization and starvation survival strategy of cephalopods. J Comp Physiol B 2016; 186:711-25. [DOI: 10.1007/s00360-016-0991-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 03/27/2016] [Accepted: 04/13/2016] [Indexed: 10/25/2022]
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119
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Titov DV, Cracan V, Goodman RP, Peng J, Grabarek Z, Mootha VK. Complementation of mitochondrial electron transport chain by manipulation of the NAD+/NADH ratio. Science 2016; 352:231-5. [PMID: 27124460 DOI: 10.1126/science.aad4017] [Citation(s) in RCA: 281] [Impact Index Per Article: 35.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Accepted: 01/25/2016] [Indexed: 12/16/2022]
Abstract
A decline in electron transport chain (ETC) activity is associated with many human diseases. Although diminished mitochondrial adenosine triphosphate production is recognized as a source of pathology, the contribution of the associated reduction in the ratio of the amount of oxidized nicotinamide adenine dinucleotide (NAD(+)) to that of its reduced form (NADH) is less clear. We used a water-forming NADH oxidase from Lactobacillus brevis (LbNOX) as a genetic tool for inducing a compartment-specific increase of the NAD(+)/NADH ratio in human cells. We used LbNOX to demonstrate the dependence of key metabolic fluxes, gluconeogenesis, and signaling on the cytosolic or mitochondrial NAD(+)/NADH ratios. Expression of LbNOX in the cytosol or mitochondria ameliorated proliferative and metabolic defects caused by an impaired ETC. The results underscore the role of reductive stress in mitochondrial pathogenesis and demonstrate the utility of targeted LbNOX for direct, compartment-specific manipulation of redox state.
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Affiliation(s)
- Denis V Titov
- Howard Hughes Medical Institute and Department of Molecular Biology, Massachusetts General Hospital, Boston, MA, USA. Department of Systems Biology, Harvard Medical School, Boston, MA, USA. Broad Institute, Cambridge, MA, USA
| | - Valentin Cracan
- Howard Hughes Medical Institute and Department of Molecular Biology, Massachusetts General Hospital, Boston, MA, USA. Department of Systems Biology, Harvard Medical School, Boston, MA, USA. Broad Institute, Cambridge, MA, USA
| | - Russell P Goodman
- Howard Hughes Medical Institute and Department of Molecular Biology, Massachusetts General Hospital, Boston, MA, USA. Division of Gastroenterology, Massachusetts General Hospital, Boston, MA, USA
| | - Jun Peng
- Howard Hughes Medical Institute and Department of Molecular Biology, Massachusetts General Hospital, Boston, MA, USA
| | - Zenon Grabarek
- Howard Hughes Medical Institute and Department of Molecular Biology, Massachusetts General Hospital, Boston, MA, USA. Broad Institute, Cambridge, MA, USA
| | - Vamsi K Mootha
- Howard Hughes Medical Institute and Department of Molecular Biology, Massachusetts General Hospital, Boston, MA, USA. Department of Systems Biology, Harvard Medical School, Boston, MA, USA. Broad Institute, Cambridge, MA, USA.
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120
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Forest C, Joffin N, Jaubert AM, Noirez P. What induces watts in WAT? Adipocyte 2016; 5:136-52. [PMID: 27386158 PMCID: PMC4916896 DOI: 10.1080/21623945.2016.1187345] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2016] [Revised: 04/26/2016] [Accepted: 04/27/2016] [Indexed: 01/05/2023] Open
Abstract
Excess calories stored in white adipose tissue (WAT) could be reduced either through the activation of brown adipose tissue (BAT) or the development of brown-like cells ("beige" or "brite") in WAT, a process named "browning." Calorie dissipation in brown and beige adipocytes might rely on the induction of uncoupling protein 1 (UCP1), which is absent in white fat cells. Any increase in UCP1 is commonly considered as the trademark of energy expenditure. The intracellular events involved in the recruitment process of beige precursors were extensively studied lately, as were the effectors, hormones, cytokines, nutrients and drugs able to modulate the route of browning and theoretically affect fat mass in rodents and in humans. The aim of this review is to update the characterization of the extracellular effectors that induce UCP1 in WAT and potentially provoke calorie dissipation. The potential influence of metabolic cycling in energy expenditure is also questioned.
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Affiliation(s)
- Claude Forest
- Institut National de la Santé et de la Recherche Médicale UMR-S 1124, Faculté des Sciences Fondamentales et Biomédicales, Pharmacologie Toxicologie et Signalisation Cellulaire, Université Paris Descartes, Paris, France
- Institut de Recherche Biomédicale et d'Epidémiologie du Sport, Université Paris Descartes, Paris, France
| | - Nolwenn Joffin
- Institut National de la Santé et de la Recherche Médicale UMR-S 1124, Faculté des Sciences Fondamentales et Biomédicales, Pharmacologie Toxicologie et Signalisation Cellulaire, Université Paris Descartes, Paris, France
- Institut de Recherche Biomédicale et d'Epidémiologie du Sport, Université Paris Descartes, Paris, France
| | - Anne-Marie Jaubert
- Institut National de la Santé et de la Recherche Médicale UMR-S 1124, Faculté des Sciences Fondamentales et Biomédicales, Pharmacologie Toxicologie et Signalisation Cellulaire, Université Paris Descartes, Paris, France
| | - Philippe Noirez
- Institut de Recherche Biomédicale et d'Epidémiologie du Sport, Université Paris Descartes, Paris, France
- Faculté des Sciences et Techniques des Activités Physiques et Sportives, Université Paris Descartes, Paris, France
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121
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Suzuki S, Awai K, Ishihara A, Yamauchi K. Cold temperature blocks thyroid hormone-induced changes in lipid and energy metabolism in the liver of Lithobates catesbeianus tadpoles. Cell Biosci 2016; 6:19. [PMID: 26981232 PMCID: PMC4792105 DOI: 10.1186/s13578-016-0087-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 03/07/2016] [Indexed: 11/23/2022] Open
Abstract
BACKGROUND Exposure of the American bullfrog Lithobates catesbeianus tadpoles to low temperature affects many biological processes including lipid metabolism and the thyroid hormone (TH) signaling pathway, resulting in arrest of TH-induced metamorphosis. To clarify what molecular events occur in this phenomenon, we investigated the glycerophospholipid and fatty acid (FA) compositions, the activities of mitochondrial enzymes and the transcript levels of related genes in the liver of control (26 °C) and cold-treated (4 °C) tadpoles with or without 5 nM 3,3',5-triiodothyronine (T3). RESULTS Exposure to T3 decreased the tail height and polyunsaturation of FAs in the glycerophospholipids, and increased plasma glucose levels and transcript levels of primary TH-response genes including TH receptor, and some energy metabolic (cox4, srebp1 and fas) and FA chain elongase genes (elovl3 and elovl5). However, these T3-induced responses were abolished at 4 °C. Exposure to cold temperature enhanced plasma glucose, triglyceride and free FA levels, monounsaturation of FAs, mitochondrial enzymes activities (cytochrome c oxidase and carnitine palmitoyltransferase; U/g liver), with the upregulation of the genes involved in glycogenolysis (pygl), gluconeogenesis (pck1 and g6pc2), FA β-oxidation (acadl), and cholesterol uptake and synthesis (hmgcr, srebp2 and ldlr1), glycerophospholipids synthesis (pcyt1, pcyt2, pemt, and pparg), and FA monounsaturation (scd1) and chain elongation (elovl1 and elovl2). T3 had little effect on the cold-induced changes. CONCLUSIONS Our study demonstrated that exposures to T3 and cold temperature exert different effects on lipid metabolism, resulting in changes in the FA composition in glycerophospholipids, and suggests that a cold-induced signal may block TH-signaling pathway around primary TH-response genes.
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Affiliation(s)
- Shunsuke Suzuki
- />Department of Biological Science, Graduate School of Science, Shizuoka University, Ohya 836, Suruga-ku, Shizuoka, 422-8529 Japan
| | - Koichiro Awai
- />Department of Biological Science, Graduate School of Science, Shizuoka University, Ohya 836, Suruga-ku, Shizuoka, 422-8529 Japan
| | - Akinori Ishihara
- />Department of Biological Science, Graduate School of Science, Shizuoka University, Ohya 836, Suruga-ku, Shizuoka, 422-8529 Japan
- />Green Biology Research Division, Research Institute of Green Science and Technology, Shizuoka University, Ohya 836, Suruga-ku, Shizuoka, 422-8529 Japan
| | - Kiyoshi Yamauchi
- />Department of Biological Science, Graduate School of Science, Shizuoka University, Ohya 836, Suruga-ku, Shizuoka, 422-8529 Japan
- />Green Biology Research Division, Research Institute of Green Science and Technology, Shizuoka University, Ohya 836, Suruga-ku, Shizuoka, 422-8529 Japan
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122
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Gulyas G, Csosz E, Prokisch J, Javor A, Mezes M, Erdelyi M, Balogh K, Janaky T, Szabo Z, Simon A, Czegledi L. Effect of nano-sized, elemental selenium supplement on the proteome of chicken liver. J Anim Physiol Anim Nutr (Berl) 2016; 101:502-510. [DOI: 10.1111/jpn.12459] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2015] [Accepted: 11/24/2015] [Indexed: 01/25/2023]
Affiliation(s)
- G. Gulyas
- Department of Animal Science; University of Debrecen; Debrecen Hungary
| | - E. Csosz
- Department of Biochemistry and Molecular Biology; Faculty of Medicine; University of Debrecen; Debrecen Hungary
| | - J. Prokisch
- Department of Animal Science; University of Debrecen; Debrecen Hungary
| | - A. Javor
- Department of Animal Science; University of Debrecen; Debrecen Hungary
| | - M. Mezes
- Department of Nutrition; Szent Istvan University; Godollo Hungary
| | - M. Erdelyi
- Department of Nutrition; Szent Istvan University; Godollo Hungary
| | - K. Balogh
- Department of Nutrition; Szent Istvan University; Godollo Hungary
| | - T. Janaky
- Department of Medical Chemistry; Faculty of Medicine; University of Szeged; Szeged Hungary
| | - Z. Szabo
- Department of Medical Chemistry; Faculty of Medicine; University of Szeged; Szeged Hungary
| | - A. Simon
- Department of Animal Science; University of Debrecen; Debrecen Hungary
| | - L. Czegledi
- Department of Animal Science; University of Debrecen; Debrecen Hungary
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123
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Latorre P, Burgos C, Hidalgo J, Varona L, Carrodeguas JA, López-Buesa P. c.A2456C-substitution in Pck1 changes the enzyme kinetic and functional properties modifying fat distribution in pigs. Sci Rep 2016; 6:19617. [PMID: 26792594 PMCID: PMC4726144 DOI: 10.1038/srep19617] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 11/10/2015] [Indexed: 11/16/2022] Open
Abstract
Cytosolic phosphoenolpyruvate carboxykinase, PCK1, is one of the main regulatory enzymes of gluconeogenesis and glyceroneogenesis. The substitution of a single amino acid (Met139Leu) in PCK1 as a consequence of a single nucleotide polymorphism (SNP), c.A2456C, is associated in the pig to a negative phenotype characterized by reduced intramuscular fat content, enhanced backfat thickness and lower meat quality. The p.139L enzyme shows reduced kcat values in the glyceroneogenic direction and enhanced ones in the anaplerotic direction. Accordingly, the expression of the p.139L isoform results in about 30% lower glucose and 9% lower lipid production in cell cultures. Moreover, the ability of this isoform to be acetylated is also compromised, what would increase its susceptibility to be degraded in vivo by the ubiquitin-proteasome system. The high frequency of the c.2456C allele in modern pig breeds implies that the benefits of including c.A2456C SNP in selection programs could be considerable.
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Affiliation(s)
- Pedro Latorre
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, 50013 Zaragoza, Spain.,Instituto de Biocomputación y Física de Sistemas Complejos, Universidad de Zaragoza, 50018 Zaragoza, Spain
| | - Carmen Burgos
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, 50013 Zaragoza, Spain.,Instituto de Biocomputación y Física de Sistemas Complejos, Universidad de Zaragoza, 50018 Zaragoza, Spain
| | - Jorge Hidalgo
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, 50013 Zaragoza, Spain.,Instituto de Biocomputación y Física de Sistemas Complejos, Universidad de Zaragoza, 50018 Zaragoza, Spain
| | - Luis Varona
- Instituto de Biocomputación y Física de Sistemas Complejos, Universidad de Zaragoza, 50018 Zaragoza, Spain.,Departamento de Anatomía, Embriología y Genética, Facultad de Veterinaria, Universidad de Zaragoza, 50013 Zaragoza, Spain
| | - José Alberto Carrodeguas
- Instituto de Biocomputación y Física de Sistemas Complejos, Universidad de Zaragoza, 50018 Zaragoza, Spain.,Departamento de Bioquímica y Biología Molecular y Celular, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain.,IIS Aragón, 50009 Zaragoza, Spain
| | - Pascual López-Buesa
- Departamento de Producción Animal y Ciencia de los Alimentos, Facultad de Veterinaria, Universidad de Zaragoza, 50013 Zaragoza, Spain.,Instituto de Biocomputación y Física de Sistemas Complejos, Universidad de Zaragoza, 50018 Zaragoza, Spain
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124
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Urasaki Y, Pizzorno G, Le TT. Chronic Uridine Administration Induces Fatty Liver and Pre-Diabetic Conditions in Mice. PLoS One 2016; 11:e0146994. [PMID: 26789264 PMCID: PMC4720477 DOI: 10.1371/journal.pone.0146994] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 12/26/2015] [Indexed: 12/12/2022] Open
Abstract
Uridine is a pyrimidine nucleoside that exerts restorative functions in tissues under stress. Short-term co-administration of uridine with multiple unrelated drugs prevents drug-induced liver lipid accumulation. Uridine has the ability to modulate liver metabolism; however, the precise mechanism has not been delineated. In this study, long-term effects of uridine on liver metabolism were examined in both HepG2 cell cultures and C57BL/6J mice. We report that uridine administration was associated with O-GlcNAc modification of FOXO1, increased gluconeogenesis, reduced insulin signaling activity, and reduced expression of a liver-specific fatty acid binding protein FABP1. Long-term uridine feeding induced systemic glucose intolerance and severe liver lipid accumulation in mice. Our findings suggest that the therapeutic potentials of uridine should be designed for short-term acute administration.
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Affiliation(s)
- Yasuyo Urasaki
- Department of Biomedical Sciences, College of Medicine, Roseman University of Health Sciences, 10530 Discovery Drive, Las Vegas, Nevada, 89135, United States of America
| | - Giuseppe Pizzorno
- Desert Research Institute, 10530 Discovery Drive, Las Vegas, Nevada, 89135, United States of America
| | - Thuc T. Le
- Department of Biomedical Sciences, College of Medicine, Roseman University of Health Sciences, 10530 Discovery Drive, Las Vegas, Nevada, 89135, United States of America
- * E-mail:
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125
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Yuan Y, Hakimi P, Kao C, Kao A, Liu R, Janocha A, Boyd-Tressler A, Hang X, Alhoraibi H, Slater E, Xia K, Cao P, Shue Q, Ching TT, Hsu AL, Erzurum SC, Dubyak GR, Berger NA, Hanson RW, Feng Z. Reciprocal Changes in Phosphoenolpyruvate Carboxykinase and Pyruvate Kinase with Age Are a Determinant of Aging in Caenorhabditis elegans. J Biol Chem 2016; 291:1307-19. [PMID: 26631730 PMCID: PMC4714217 DOI: 10.1074/jbc.m115.691766] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 11/30/2015] [Indexed: 01/01/2023] Open
Abstract
Aging involves progressive loss of cellular function and integrity, presumably caused by accumulated stochastic damage to cells. Alterations in energy metabolism contribute to aging, but how energy metabolism changes with age, how these changes affect aging, and whether they can be modified to modulate aging remain unclear. In locomotory muscle of post-fertile Caenorhabditis elegans, we identified a progressive decrease in cytosolic phosphoenolpyruvate carboxykinase (PEPCK-C), a longevity-associated metabolic enzyme, and a reciprocal increase in glycolytic pyruvate kinase (PK) that were necessary and sufficient to limit lifespan. Decline in PEPCK-C with age also led to loss of cellular function and integrity including muscle activity, and cellular senescence. Genetic and pharmacologic interventions of PEPCK-C, muscle activity, and AMPK signaling demonstrate that declines in PEPCK-C and muscle function with age interacted to limit reproductive life and lifespan via disrupted energy homeostasis. Quantifications of metabolic flux show that reciprocal changes in PEPCK-C and PK with age shunted energy metabolism toward glycolysis, reducing mitochondrial bioenergetics. Last, calorie restriction countered changes in PEPCK-C and PK with age to elicit anti-aging effects via TOR inhibition. Thus, a programmed metabolic event involving PEPCK-C and PK is a determinant of aging that can be modified to modulate aging.
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Affiliation(s)
| | | | - Clara Kao
- From the Departments of Pharmacology
| | | | - Ruifu Liu
- From the Departments of Pharmacology
| | - Allison Janocha
- the Department of Pathobiology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195
| | | | - Xi Hang
- From the Departments of Pharmacology, the School of Pharmacy, Suzhou Health College, Suzhou, Jiangsu 215009, China, and
| | | | | | - Kevin Xia
- From the Departments of Pharmacology
| | | | | | - Tsui-Ting Ching
- the Departments of Internal Medicine, Division of Geriatric Medicine, and
| | - Ao-Lin Hsu
- the Departments of Internal Medicine, Division of Geriatric Medicine, and Molecular and Integrative Physiology, University of Michigan, Ann Arbor, Michigan 48109
| | - Serpil C Erzurum
- the Department of Pathobiology, Lerner Research Institute, Cleveland Clinic Foundation, Cleveland, Ohio 44195
| | - George R Dubyak
- From the Departments of Pharmacology, Physiology and Biophysics, and
| | - Nathan A Berger
- Departments of Biochemistry and Medicine, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106
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126
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Jiang Y, Xiong X, Danska J, Parkinson J. Metatranscriptomic analysis of diverse microbial communities reveals core metabolic pathways and microbiome-specific functionality. MICROBIOME 2016; 4:2. [PMID: 26757703 PMCID: PMC4710996 DOI: 10.1186/s40168-015-0146-x] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 12/19/2015] [Indexed: 05/11/2023]
Abstract
BACKGROUND Metatranscriptomics is emerging as a powerful technology for the functional characterization of complex microbial communities (microbiomes). Use of unbiased RNA-sequencing can reveal both the taxonomic composition and active biochemical functions of a complex microbial community. However, the lack of established reference genomes, computational tools and pipelines make analysis and interpretation of these datasets challenging. Systematic studies that compare data across microbiomes are needed to demonstrate the ability of such pipelines to deliver biologically meaningful insights on microbiome function. RESULTS Here, we apply a standardized analytical pipeline to perform a comparative analysis of metatranscriptomic data from diverse microbial communities derived from mouse large intestine, cow rumen, kimchi culture, deep-sea thermal vent and permafrost. Sequence similarity searches allowed annotation of 19 to 76% of putative messenger RNA (mRNA) reads, with the highest frequency in the kimchi dataset due to its relatively low complexity and availability of closely related reference genomes. Metatranscriptomic datasets exhibited distinct taxonomic and functional signatures. From a metabolic perspective, we identified a common core of enzymes involved in amino acid, energy and nucleotide metabolism and also identified microbiome-specific pathways such as phosphonate metabolism (deep sea) and glycan degradation pathways (cow rumen). Integrating taxonomic and functional annotations within a novel visualization framework revealed the contribution of different taxa to metabolic pathways, allowing the identification of taxa that contribute unique functions. CONCLUSIONS The application of a single, standard pipeline confirms that the rich taxonomic and functional diversity observed across microbiomes is not simply an artefact of different analysis pipelines but instead reflects distinct environmental influences. At the same time, our findings show how microbiome complexity and availability of reference genomes can impact comprehensive annotation of metatranscriptomes. Consequently, beyond the application of standardized pipelines, additional caution must be taken when interpreting their output and performing downstream, microbiome-specific, analyses. The pipeline used in these analyses along with a tutorial has been made freely available for download from our project website: http://www.compsysbio.org/microbiome .
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Affiliation(s)
- Yue Jiang
- Program in Molecular Structure and Function, The Hospital for Sick Children, Peter Gilgan Center for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada.
| | - Xuejian Xiong
- Program in Molecular Structure and Function, The Hospital for Sick Children, Peter Gilgan Center for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada.
| | - Jayne Danska
- Department of Immunology, University of Toronto, Toronto, ON, Canada.
- Program in Genetics and Genomic Biology, The Hospital for Sick Children, Toronto, ON, Canada.
- Department of Medical Biophysics, University of Toronto, Toronto, ON, Canada.
| | - John Parkinson
- Program in Molecular Structure and Function, The Hospital for Sick Children, Peter Gilgan Center for Research and Learning, 686 Bay Street, Toronto, ON, M5G 0A4, Canada.
- Departments of Biochemistry, Computer Science and Molecular Genetics, University of Toronto, Toronto, ON, Canada.
- Centre for the Analysis of Genome Evolution, University of Toronto, Toronto, ON, Canada.
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127
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Biocomputational analysis of phosphoenolpyruvate carboxykinase from Raillietina echinobothrida, a cestode parasite, and its interaction with possible modulators. Parasitology 2015; 143:300-13. [PMID: 26690489 DOI: 10.1017/s0031182015001742] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Phosphoenolpyruvate carboxykinase (PEPCK) involved in gluconeogenesis in higher vertebrates opposedly plays a significant role in glucose oxidation of the cestode parasite, Raillietina echinobothrida. Considering the importance of the enzyme in the parasite and lack of its structural details, there exists an urgent need for understanding the molecular details and development of possible modulators. Hence, in this study, PEPCK gene was obtained using rapid amplification of cDNA ends, and various biocomputational analyses were performed. Homology model of the enzyme was generated, and docking simulations were executed with its substrate, co-factor, and modulators. Computer hits were generated after structure- and ligand-based screening using Discovery Studio 4.1 software; the predicted interactions were compared with those of the existing structural information of PEPCK. In order to evaluate the docking simulation results of the modulators, PEPCK gene was cloned and the overexpressed protein was purified for kinetic studies. Enzyme kinetics and in vitro studies revealed that out of the modulators tested, tetrahydropalmatine (THP) inhibited the enzyme with lowest inhibition constant value of 93 nm. Taking the results together, we conclude that THP could be a potential inhibitor for PEPCK in the parasite.
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128
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Zhang Q, Koser SL, Bequette BJ, Donkin SS. Effect of propionate on mRNA expression of key genes for gluconeogenesis in liver of dairy cattle. J Dairy Sci 2015; 98:8698-709. [DOI: 10.3168/jds.2015-9590] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 07/28/2015] [Indexed: 11/19/2022]
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129
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Carr RM, Reid AE. FXR agonists as therapeutic agents for non-alcoholic fatty liver disease. Curr Atheroscler Rep 2015; 17:500. [PMID: 25690590 DOI: 10.1007/s11883-015-0500-2] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Non-alcoholic fatty liver disease (NAFLD) is the hepatic manifestation of the metabolic syndrome and a risk factor for both cardiovascular and hepatic related morbidity and mortality. The increasing prevalence of this disease requires novel therapeutic approaches to prevent disease progression. Farnesoid X receptors are bile acid receptors with roles in lipid, glucose, and energy homeostasis. Synthetic farnesoid X receptor (FXR) agonists have been developed to specifically target these receptors for therapeutic use in NAFLD patients. Here, we present a review of bile acid physiology and how agonism of FXR receptors has been examined in pre-clinical and clinical NAFLD. Early evidence suggests a potential role for synthetic FXR agonists in the management of NAFLD; however, additional studies are needed to clarify their effects on lipid and glucose parameters in humans.
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Affiliation(s)
- Rotonya M Carr
- Division of Gastroenterology, University of Pennsylvania, 421 Curie Boulevard, 907 Biomedical Research Building, Philadelphia, PA, 19104, USA,
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130
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Katiyar SP, Jain A, Dhanjal JK, Sundar D. Mixed Inhibition of cPEPCK by Genistein, Using an Extended Binding Site Located Adjacent to Its Catalytic Cleft. PLoS One 2015; 10:e0141987. [PMID: 26528723 PMCID: PMC4631375 DOI: 10.1371/journal.pone.0141987] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2015] [Accepted: 10/15/2015] [Indexed: 11/19/2022] Open
Abstract
Cytosolic phosphoenolpyruvate carboxykinase (cPEPCK) is a critical enzyme involved in gluconeogenesis, glyceroneogenesis and cataplerosis. cPEPCK converts oxaloacetic acid (OAA) into phosphoenol pyruvate (PEP) in the presence of GTP. cPEPCK is known to be associated with type 2 diabetes. Genistein is an isoflavone compound that shows anti-diabetic and anti-obesitic properties. Experimental studies have shown a decrease in the blood glucose level in the presence of genistein by lowering the functional activity of cPEPCK, an enzyme of gluconeogenesis. Using computational techniques such as molecular modeling, molecular docking, molecular dynamics simulation and binding free energy calculations, we identified cPEPCK as a direct target of genistein. We studied the molecular interactions of genistein with three possible conformations of cPEPCK-unbound cPEPCK (u_cPEPCK), GTP bound cPEPCK (GTP_cPEPCK) and GDP bound cPEPCK (GDP_cPEPCK). Binding of genistein was also compared with an already known cPEPCK inhibitor. We analyzed the interactions of genistein with cPEPCK enzyme and compared them with its natural substrate (OAA), product (PEP) and known inhibitor (3-MPA). Our results demonstrate that genistein uses the mechanism of mixed inhibition to block the functional activity of cPEPCK and thus can serve as a potential anti-diabetic and anti-obesity drug candidate. We also identified an extended binding site in the catalytic cleft of cPEPCK which is used by 3-MPA to inhibit cPEPCK non-competitively. We demonstrate that extended binding site of cPEPCK can further be exploited for designing new drugs against cPEPCK.
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Affiliation(s)
- Shashank Prakash Katiyar
- Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology (IIT) Delhi, Hauz Khas, New Delhi, India
| | - Arpit Jain
- Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology (IIT) Delhi, Hauz Khas, New Delhi, India
| | - Jaspreet Kaur Dhanjal
- Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology (IIT) Delhi, Hauz Khas, New Delhi, India
| | - Durai Sundar
- Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology (IIT) Delhi, Hauz Khas, New Delhi, India
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131
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PEPCK Coordinates the Regulation of Central Carbon Metabolism to Promote Cancer Cell Growth. Mol Cell 2015; 60:571-83. [PMID: 26481663 DOI: 10.1016/j.molcel.2015.09.025] [Citation(s) in RCA: 155] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Revised: 09/14/2015] [Accepted: 09/25/2015] [Indexed: 01/05/2023]
Abstract
Phosphoenolpyruvate carboxykinase (PEPCK) is well known for its role in gluconeogenesis. However, PEPCK is also a key regulator of TCA cycle flux. The TCA cycle integrates glucose, amino acid, and lipid metabolism depending on cellular needs. In addition, biosynthetic pathways crucial to tumor growth require the TCA cycle for the processing of glucose and glutamine derived carbons. We show here an unexpected role for PEPCK in promoting cancer cell proliferation in vitro and in vivo by increasing glucose and glutamine utilization toward anabolic metabolism. Unexpectedly, PEPCK also increased the synthesis of ribose from non-carbohydrate sources, such as glutamine, a phenomenon not previously described. Finally, we show that the effects of PEPCK on glucose metabolism and cell proliferation are in part mediated via activation of mTORC1. Taken together, these data demonstrate a role for PEPCK that links metabolic flux and anabolic pathways to cancer cell proliferation.
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132
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Schein V, Kucharski LC, Guerreiro PMG, Martins TL, Morgado I, Power DM, Canario AVM, da Silva RSM. Stanniocalcin 1 effects on the renal gluconeogenesis pathway in rat and fish. Mol Cell Endocrinol 2015; 414:1-8. [PMID: 26187698 DOI: 10.1016/j.mce.2015.07.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2015] [Revised: 07/03/2015] [Accepted: 07/10/2015] [Indexed: 11/16/2022]
Abstract
The mammalian kidney contributes significantly to glucose homeostasis through gluconeogenesis. Considering that stanniocalcin 1 (STC1) regulates ATP production, is synthesized and acts in different cell types of the nephron, the present study hypothesized that STC1 may be implicated in the regulation of gluconeogenesis in the vertebrate kidney. Human STC1 strongly reduced gluconeogenesis from (14)C-glutamine in rat renal medulla (MD) slices but not in renal cortex (CX), nor from (14)C-lactic acid. Total PEPCK activity was markedly reduced by hSTC1 in MD but not in CX. Pck2 (mitochondrial PEPCK isoform) was down-regulated by hSTC1 in MD but not in CX. In fish (Dicentrarchus labrax) kidney slices, both STC1-A and -B isoforms decreased gluconeogenesis from (14)C-acid lactic, while STC1-A increased gluconeogenesis from (14)C-glutamine. Overall, our results demonstrate a role for STC1 in the control of glucose synthesis via renal gluconeogenesis in mammals and suggest that it may have a similar role in teleost fishes.
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Affiliation(s)
- Vanessa Schein
- Pos-Graduate Program in Biological Sciences, Department of Physiology, Institute of Health Sciences, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite, 500, 90050-170, Porto Alegre, RS, Brazil; Pos-Graduate Program in Health Sciences, Department of Obstetrics and Gynecology, School of Medicine, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2400, 90035-003, Porto Alegre, RS, Brazil; CCMAR - Centre for Marine Sciences, University of Algarve, Campus de Gambelas, 8005-139, Faro, Portugal.
| | - Luiz C Kucharski
- Pos-Graduate Program in Biological Sciences, Department of Physiology, Institute of Health Sciences, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite, 500, 90050-170, Porto Alegre, RS, Brazil
| | - Pedro M G Guerreiro
- CCMAR - Centre for Marine Sciences, University of Algarve, Campus de Gambelas, 8005-139, Faro, Portugal
| | - Tiago Leal Martins
- Pos-Graduate Program in Biological Sciences, Department of Physiology, Institute of Health Sciences, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite, 500, 90050-170, Porto Alegre, RS, Brazil
| | - Isabel Morgado
- CCMAR - Centre for Marine Sciences, University of Algarve, Campus de Gambelas, 8005-139, Faro, Portugal
| | - Deborah M Power
- CCMAR - Centre for Marine Sciences, University of Algarve, Campus de Gambelas, 8005-139, Faro, Portugal
| | - Adelino V M Canario
- CCMAR - Centre for Marine Sciences, University of Algarve, Campus de Gambelas, 8005-139, Faro, Portugal
| | - Roselis S M da Silva
- Pos-Graduate Program in Biological Sciences, Department of Physiology, Institute of Health Sciences, Universidade Federal do Rio Grande do Sul, Rua Sarmento Leite, 500, 90050-170, Porto Alegre, RS, Brazil
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Sosa MH, Giordana L, Nowicki C. Exploring biochemical and functional features of Leishmania major phosphoenolpyruvate carboxykinase. Arch Biochem Biophys 2015; 583:120-9. [PMID: 26271440 DOI: 10.1016/j.abb.2015.07.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 07/20/2015] [Accepted: 07/22/2015] [Indexed: 10/23/2022]
Abstract
This work reports the first functional characterization of leishmanial PEPCK. The recombinant Leishmania major enzyme (Lmj_PEPCK) exhibits equivalent kcat values for the phosphoenolpyruvate (PEP) and oxaloacetate (OAA) forming reactions. The apparent Km towards OAA is 10-fold lower than that for PEP, while the Km values for ADP and ATP are equivalent. Mutagenesis studies showed that D241, D242 and H205 of Lmj_PEPCK like the homologous residues of all known PEPCKs are implicated in metal ions binding. In contrast, the replacement of R43 for Q nearly abolishes Lmj_PEPCK activity. Moreover, the Y180F variant exhibits unchanged Km values for PEP, Mn(2+), and [Formula: see text] , being the kcat for PEP- but not that for OAA-forming reaction more notably decreased. Instead, the Y180A mutant displays an increase in the Km value towards Mn(2+). Therefore in Lmj_PEPCK, Y180 seems to exert different functions to those of the analogous residue in ATP- and GTP-dependant enzymes. Besides, the guanidinium group of R43 appears to play an essential but yet unknown role. These findings promote the need for further structural studies to disclose whether Y180 and R43 participate in the catalytic mechanism or/and in the transitions between the open and the catalytically competent (closed) forms of Lmj_PEPCK.
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Affiliation(s)
- Máximo Hernán Sosa
- Instituto de Química y Fisicoquímica Biológica IQUIFIB-CONICET, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Lucila Giordana
- Instituto de Química y Fisicoquímica Biológica IQUIFIB-CONICET, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, C1113AAD, Buenos Aires, Argentina
| | - Cristina Nowicki
- Instituto de Química y Fisicoquímica Biológica IQUIFIB-CONICET, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires, Junín 956, C1113AAD, Buenos Aires, Argentina.
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134
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Cheon JM, Kim DI, Kim KS. Insulin sensitivity improvement of fermented Korean Red Ginseng (Panax ginseng) mediated by insulin resistance hallmarks in old-aged ob/ob mice. J Ginseng Res 2015; 39:331-7. [PMID: 26869825 PMCID: PMC4593781 DOI: 10.1016/j.jgr.2015.03.005] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 03/09/2015] [Accepted: 03/10/2015] [Indexed: 12/11/2022] Open
Abstract
BACKGROUND The biological actions of various ginseng extracts have been studied for treating obesity and diabetes mellitus. However, few studies have evaluated the effects of fermented Korean Red Ginseng (Panax ginseng Meyer) on metabolic syndrome. The present study evaluated the antiobesity and antidiabetic effects of fermented red ginseng (FRG) on old-aged, obese, leptin-deficient (B6.V-Lepob, "ob/ob") mice. METHODS The animals were divided into three groups and given water containing 0%, 0.5%, and 1.0% FRG for 16 wk. The effect of FRG on ob/ob mice was determined by measuring changes in body weight, levels of blood glucose, serum contents of triglycerides, total cholesterol and free fatty acids, messenger RNA (mRNA) expressions of key factors associated with insulin action, such as insulin receptor (IR), lipoprotein lipase (LPL), glucose transporter 1 and 4 (GLUT1 and GLUT4), peroxisome proliferators-activated receptor gamma (PPAR-γ), and phosphoenolpyruvate carboxykinase (PEPCK) in the liver and in muscle, and histology of the liver and pancreas. RESULTS FRG-treated mice had decreased body weight and blood glucose levels compared with control ob/ob mice. However, anti-obesity effect of FRG was not evident rather than hypoglycemic effect in old aged ob/ob mice. The hyperlipidemia in control group was attenuated in FRG-treated ob/ob mice. The mRNA expressions of IR, LPL, GLUT1, GLUT4, PPAR-γ, and PEPCK in the liver and in muscle were increased in the FRG-treated groups compared with the control group. CONCLUSION These results suggest that FRG may play a vital role in improving insulin sensitivity relative to reducing body weight in old-aged ob/ob mice.
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Affiliation(s)
- Jeong-Mu Cheon
- Department of Veterinary Toxicology, College of Veterinary Medicine, Kyungpook National University, Daegu, Korea
| | - Dae-Ik Kim
- Daegu Technopark Oriental Medicine Industry Support Center, Daegu, Korea
| | - Kil-Soo Kim
- Department of Veterinary Toxicology, College of Veterinary Medicine, Kyungpook National University, Daegu, Korea
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135
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Balan MD, Mcleod MJ, Lotosky WR, Ghaly M, Holyoak T. Inhibition and Allosteric Regulation of Monomeric Phosphoenolpyruvate Carboxykinase by 3-Mercaptopicolinic Acid. Biochemistry 2015; 54:5878-87. [PMID: 26322521 DOI: 10.1021/acs.biochem.5b00822] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
For almost 40 years, it has been known that tryptophan metabolites and picolinic acid analogues act as inhibitors of gluconeogenesis. Early studies observed that 3-mercaptopicolinic acid (MPA) was a potent hypoglycemic agent via inhibition of glucose synthesis through the specific inhibition of phosphoenolpyruvate carboxykinase (PEPCK) in the gluconeogenesis pathway. Despite prior kinetic investigation, the mechanism of the inhibition by MPA is unclear. To clarify the mechanism of inhibition exerted by MPA on PEPCK, we have undertaken structural and kinetic studies. The kinetic data in concert with crystallographic structures of PEPCK in complex with MPA and the substrates for the reaction illustrate that PEPCK is inhibited by the binding of MPA at two discrete binding sites: one acting in a competitive fashion with PEP/OAA (∼10 μM) and the other acting at a previously unidentified allosteric site (Ki ∼ 150 μM). The structural studies suggest that binding of MPA to the allosteric pocket stabilizes an altered conformation of the nucleotide-binding site that in turn reduces the affinity of the enzyme for the nucleotide.
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Affiliation(s)
- Marc D Balan
- Department of Biochemistry and Molecular Biology, The University of Kansas Medical Center , Kansas City, Kansas 66160, United States
| | - Matthew J Mcleod
- Department of Biology, University of Waterloo , Waterloo, ON N2L 3G1, Canada
| | - William R Lotosky
- Department of Biology, University of Waterloo , Waterloo, ON N2L 3G1, Canada
| | - Mark Ghaly
- Department of Biology, University of Waterloo , Waterloo, ON N2L 3G1, Canada
| | - Todd Holyoak
- Department of Biology, University of Waterloo , Waterloo, ON N2L 3G1, Canada.,Department of Biochemistry and Molecular Biology, The University of Kansas Medical Center , Kansas City, Kansas 66160, United States
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136
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Liu P, Wang Y, Du X, Yao L, Li F, Meng Z. Transcriptome Analysis of Thermal Parthenogenesis of the Domesticated Silkworm. PLoS One 2015; 10:e0135215. [PMID: 26274803 PMCID: PMC4537240 DOI: 10.1371/journal.pone.0135215] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2014] [Accepted: 02/13/2015] [Indexed: 11/19/2022] Open
Abstract
Thermal induction of parthenogenesis (also known as thermal parthenogenesis) in silkworms is an important technique that has been used in artificial insemination, expansion of hybridization, transgenesis and sericultural production; however, the exact mechanisms of this induction remain unclear. This study aimed to investigate the gene expression profile in silkworms undergoing thermal parthenogenesis using RNA-seq analysis. The transcriptome profiles indicated that in non-induced and induced eggs, the numbers of differentially expressed genes (DEGs) for the parthenogenetic line (PL) and amphigenetic line (AL) were 538 and 545, respectively, as determined by fold-change ≥ 2. Gene ontology (GO) analysis showed that DEGs between two lines were mainly involved in reproduction, formation of chorion, female gamete generation and cell development pathways. Upregulation of many chorion genes in AL suggests that the maturation rate of AL eggs was slower than PL eggs. Some DEGs related to reactive oxygen species removal, DNA repair and heat shock response were differentially expressed between the two lines, such as MPV-17, REV1 and HSP68. These results supported the view that a large fraction of genes are differentially expressed between PL and AL, which offers a new approach to identifying the molecular mechanism of silkworm thermal parthenogenesis.
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Affiliation(s)
- Peigang Liu
- Sericultural Research Institute, Zhejiang Academy of Agricultural Sciences, Hangzhou, People’s Republic of China
| | - Yongqiang Wang
- Sericultural Research Institute, Zhejiang Academy of Agricultural Sciences, Hangzhou, People’s Republic of China
| | - Xin Du
- Sericultural Research Institute, Zhejiang Academy of Agricultural Sciences, Hangzhou, People’s Republic of China
| | - Lusong Yao
- Sericultural Research Institute, Zhejiang Academy of Agricultural Sciences, Hangzhou, People’s Republic of China
| | - Fengbo Li
- Sericultural Research Institute, Zhejiang Academy of Agricultural Sciences, Hangzhou, People’s Republic of China
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Sericultural Research Institute, Zhejiang Academy of Agricultural Sciences, Hangzhou, People’s Republic of China
| | - Zhiqi Meng
- Sericultural Research Institute, Zhejiang Academy of Agricultural Sciences, Hangzhou, People’s Republic of China
- State Key Laboratory Breeding Base for Zhejiang Sustainable Pest and Disease Control, Sericultural Research Institute, Zhejiang Academy of Agricultural Sciences, Hangzhou, People’s Republic of China
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137
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Brown LD, Rozance PJ, Bruce JL, Friedman JE, Hay WW, Wesolowski SR. Limited capacity for glucose oxidation in fetal sheep with intrauterine growth restriction. Am J Physiol Regul Integr Comp Physiol 2015. [PMID: 26224688 DOI: 10.1152/ajpregu.00197.2015] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Intrauterine growth-restricted (IUGR) fetal sheep, produced by placental insufficiency, have lower oxygen concentrations, higher lactate concentrations, and increased hepatic glucose production that is resistant to suppression by insulin. We hypothesized that increased lactate production in the IUGR fetus results from reduced glucose oxidation, during basal and maximal insulin-stimulated conditions, and is used to support glucose production. To test this, studies were performed in late-gestation control (CON) and IUGR fetal sheep under basal and hyperinsulinemic-clamp conditions. The basal glucose oxidation rate was similar and increased by 30-40% during insulin clamp in CON and IUGR fetuses (P < 0.005). However, the fraction of glucose oxidized was 15% lower in IUGR fetuses during basal and insulin-clamp periods (P = 0.05). IUGR fetuses also had four-fold higher lactate concentrations (P < 0.001) and lower lactate uptake rates (P < 0.05). In IUGR fetal muscle and liver, mRNA expression of pyruvate dehydrogenase kinase (PDK4), an inhibitor of glucose oxidation, was increased over fourfold. In IUGR fetal liver, but not skeletal muscle, mRNA expression of lactate dehydrogenase A (LDHA) was increased nearly fivefold. Hepatic expression of the gluconeogenic genes, phosphoenolpyruvate carboxykinase (PCK)1, and PCK2, was correlated with expression of PDK4 and LDHA. Collectively, these in vivo and tissue data support limited capacity for glucose oxidation in the IUGR fetus via increased PDK4 in skeletal muscle and liver. We speculate that lactate production also is increased, which may supply carbon for glucose production in the IUGR fetal liver.
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Affiliation(s)
- Laura D Brown
- Perinatal Research Center, Department of Pediatrics, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Paul J Rozance
- Perinatal Research Center, Department of Pediatrics, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Jennifer L Bruce
- Perinatal Research Center, Department of Pediatrics, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Jacob E Friedman
- Perinatal Research Center, Department of Pediatrics, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - William W Hay
- Perinatal Research Center, Department of Pediatrics, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado
| | - Stephanie R Wesolowski
- Perinatal Research Center, Department of Pediatrics, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado
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138
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Kadiri S, Monnier C, Ganbold M, Ledent T, Capeau J, Antoine B. The nuclear retinoid-related orphan receptor-α regulates adipose tissue glyceroneogenesis in addition to hepatic gluconeogenesis. Am J Physiol Endocrinol Metab 2015; 309:E105-14. [PMID: 26015436 DOI: 10.1152/ajpendo.00518.2014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2014] [Accepted: 05/17/2015] [Indexed: 12/23/2022]
Abstract
Circadian rhythms have an essential role in feeding behavior and metabolism. RORα is a nuclear receptor involved in the interface of the circadian system and metabolism. The adipocyte glyceroneogenesis pathway derives free fatty acids (FFA) liberated by lipolysis to reesterification into triglycerides, thus regulating FFA homeostasis and fat mass. Glyceroneogenesis shares with hepatic gluconeogenesis the key enzyme phosphoenolpyruvate carboxykinase c (PEPCKc), whose gene is a RORα target in the liver. RORα-deficient mice (staggerer, ROR(sg/sg)) have been shown to exhibit a lean phenotype and fasting hypoglycemia for unsolved reasons. In the present study, we investigated whether adipocyte glyceroneogenesis might also be a target pathway of RORα, and we further evaluated the role of RORα in hepatocyte gluconeogenesis. In vivo investigations comparing ROR(sg/sg) mice with their wild-type (WT) littermates under fasting conditions demonstrated that, in the absence of RORα, the release of FFA into the bloodstream was altered and the rise in glycemia in response to pyruvate reduced. The functional analysis of each pathway, performed in adipose tissue or liver explants, confirmed the impairment of adipocyte glyceroneogenesis and liver gluconeogenesis in the ROR(sg/sg) mice; these reductions of FFA reesterification or glucose production were associated with decreases in PEPCKc mRNA and protein levels. Treatment of explants with RORα agonist or antagonist enhanced or inhibited these pathways, respectively, in tissues isolated from WT but not ROR(sg/sg) mice. Our results indicated that both adipocyte glyceroneogenesis and hepatocyte gluconeogenesis were regulated by RORα. This study demonstrates the physiological function of RORα in regulating both glucose and FFA homeostasis.
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Affiliation(s)
- Sarah Kadiri
- Institut National de la Santé et de la Recherche Médicale, U938, Paris, France; Sorbonne Université, University Pierre et Marie Curie; Univ Paris-6, UMR_S 938, l'Institut de Cardiométabolisme et Nutrition, Paris, France; and
| | - Chloé Monnier
- Institut National de la Santé et de la Recherche Médicale, U938, Paris, France; Sorbonne Université, University Pierre et Marie Curie; Univ Paris-6, UMR_S 938, l'Institut de Cardiométabolisme et Nutrition, Paris, France; and
| | - Munkhzul Ganbold
- Institut National de la Santé et de la Recherche Médicale, U938, Paris, France; Sorbonne Université, University Pierre et Marie Curie; Univ Paris-6, UMR_S 938, l'Institut de Cardiométabolisme et Nutrition, Paris, France; and
| | - Tatiana Ledent
- Institut National de la Santé et de la Recherche Médicale, U938, Paris, France; Sorbonne Université, University Pierre et Marie Curie; Univ Paris-6, UMR_S 938, l'Institut de Cardiométabolisme et Nutrition, Paris, France; and
| | - Jacqueline Capeau
- Institut National de la Santé et de la Recherche Médicale, U938, Paris, France; Sorbonne Université, University Pierre et Marie Curie; Univ Paris-6, UMR_S 938, l'Institut de Cardiométabolisme et Nutrition, Paris, France; and
| | - Bénédicte Antoine
- Institut National de la Santé et de la Recherche Médicale, U938, Paris, France; Sorbonne Université, University Pierre et Marie Curie; Univ Paris-6, UMR_S 938, l'Institut de Cardiométabolisme et Nutrition, Paris, France; and Centre National de la Recherche Scientifique, UMR_S 938, Paris, France
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139
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Driedzic WR. Rainbow smelt: the unusual case of cryoprotection by sustained glycerol production in an aquatic animal. J Comp Physiol B 2015; 185:487-99. [DOI: 10.1007/s00360-015-0903-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2014] [Revised: 03/12/2015] [Accepted: 04/19/2015] [Indexed: 12/18/2022]
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140
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Cowens KR, Simpson S, Thomas WK, Carey GB. Polybrominated Diphenyl Ether (PBDE)-Induced Suppression of Phosphoenolpyruvate Carboxykinase (PEPCK) Decreases Hepatic Glyceroneogenesis and Disrupts Hepatic Lipid Homeostasis. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2015; 78:1437-49. [PMID: 26692069 DOI: 10.1080/15287394.2015.1098580] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Polybrominated diphenyl ethers (PBDE) are a class of flame-retardant chemicals that leach into the environment and enter the human body. PBDE have been shown to suppress activity of phosphoenolpyruvate carboxykinase (PEPCK), a key enzyme in fatty acid esterification via hepatic glyceroneogenesis. The objective of this investigation was to assess hepatic glyceroneogenesis and lipid metabolism in PBDE-treated rats. Male, weanling Wistar rats were gavaged daily for 28 d with 14 mg/kg body weight of either DE-71, a commercial PBDE mixture (treated), or corn oil (control). After a 48-h fast, rats were euthanized, blood was obtained, and livers were excised. Suppression of hepatic PEPCK activity by 40% was noted. Serum ketone bodies were elevated by 27% in treated rats compared to controls, while hepatic glyceroneogenesis as measured by (14)C-pyruvate incorporation into triglycerides was 41% lower in explants from treated rats compared to controls. Liver lipid content was 29% lower in treated animals compared to controls. Taken together, these findings suggest that DE-71-induced inhibition of hepatic PEPCK activity alters lipid metabolism by redirecting fatty acids away from esterification and storage toward ketone synthesis.
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Affiliation(s)
- Kylie R Cowens
- a Department of Molecular, Cellular, and Biomedical Sciences , University of New Hampshire , Durham , New Hampshire , USA
| | - Stephen Simpson
- a Department of Molecular, Cellular, and Biomedical Sciences , University of New Hampshire , Durham , New Hampshire , USA
| | - W Kelley Thomas
- a Department of Molecular, Cellular, and Biomedical Sciences , University of New Hampshire , Durham , New Hampshire , USA
| | - Gale B Carey
- a Department of Molecular, Cellular, and Biomedical Sciences , University of New Hampshire , Durham , New Hampshire , USA
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141
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Control of metabolic adaptation to fasting by dILP6-induced insulin signaling in Drosophila oenocytes. Proc Natl Acad Sci U S A 2014; 111:17959-64. [PMID: 25472843 DOI: 10.1073/pnas.1409241111] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Metabolic adaptation to changing dietary conditions is critical to maintain homeostasis of the internal milieu. In metazoans, this adaptation is achieved by a combination of tissue-autonomous metabolic adjustments and endocrine signals that coordinate the mobilization, turnover, and storage of nutrients across tissues. To understand metabolic adaptation comprehensively, detailed insight into these tissue interactions is necessary. Here we characterize the tissue-specific response to fasting in adult flies and identify an endocrine interaction between the fat body and liver-like oenocytes that regulates the mobilization of lipid stores. Using tissue-specific expression profiling, we confirm that oenocytes in adult flies play a central role in the metabolic adaptation to fasting. Furthermore, we find that fat body-derived Drosophila insulin-like peptide 6 (dILP6) induces lipid uptake in oenocytes, promoting lipid turnover during fasting and increasing starvation tolerance of the animal. Selective activation of insulin/IGF signaling in oenocytes by a fat body-derived peptide represents a previously unidentified regulatory principle in the control of metabolic adaptation and starvation tolerance.
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142
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Álvarez Z, Hyroššová P, Perales JC, Alcántara S. Neuronal Progenitor Maintenance Requires Lactate Metabolism and PEPCK-M-Directed Cataplerosis. Cereb Cortex 2014; 26:1046-58. [PMID: 25452568 DOI: 10.1093/cercor/bhu281] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
This study investigated the metabolic requirements for neuronal progenitor maintenance in vitro and in vivo by examining the metabolic adaptations that support neuronal progenitors and neural stem cells (NSCs) in their undifferentiated state. We demonstrate that neuronal progenitors are strictly dependent on lactate metabolism, while glucose induces their neuronal differentiation. Lactate signaling is not by itself capable of maintaining the progenitor phenotype. The consequences of lactate metabolism include increased mitochondrial and oxidative metabolism, with a strict reliance on cataplerosis through the mitochondrial phosphoenolpyruvate carboxykinase (PEPCK-M) pathway to support anabolic functions, such as the production of extracellular matrix. In vivo, lactate maintains/induces populations of postnatal neuronal progenitors/NSCs in a PEPCK-M-dependent manner. Taken together, our data demonstrate that, lactate alone or together with other physical/biochemical cues maintain NSCs/progenitors with a metabolic signature that is classically found in tissues with high anabolic capacity.
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Affiliation(s)
- Zaida Álvarez
- Institute for Bioengineering of Catalonia-IBEC, Barcelona, Spain Department of Pathology and Experimental Therapeutics CIBER en Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Barcelona, Spain
| | - Petra Hyroššová
- Department of Physiological Sciences II, Medical School (Bellvitge Campus), University of Barcelona-UB, Barcelona, Spain
| | - José Carlos Perales
- Department of Physiological Sciences II, Medical School (Bellvitge Campus), University of Barcelona-UB, Barcelona, Spain
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143
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Adams DR, Yuan H, Holyoak T, Arajs KH, Hakimi P, Markello TC, Wolfe LA, Vilboux T, Burton BK, Fajardo KF, Grahame G, Holloman C, Sincan M, Smith ACM, Wells GA, Huang Y, Vega H, Snyder JP, Golas GA, Tifft CJ, Boerkoel CF, Hanson RW, Traynelis SF, Kerr DS, Gahl WA. Three rare diseases in one Sib pair: RAI1, PCK1, GRIN2B mutations associated with Smith-Magenis Syndrome, cytosolic PEPCK deficiency and NMDA receptor glutamate insensitivity. Mol Genet Metab 2014; 113:161-70. [PMID: 24863970 PMCID: PMC4219933 DOI: 10.1016/j.ymgme.2014.04.001] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 04/05/2014] [Accepted: 04/06/2014] [Indexed: 01/28/2023]
Abstract
The National Institutes of Health Undiagnosed Diseases Program evaluates patients for whom no diagnosis has been discovered despite a comprehensive diagnostic workup. Failure to diagnose a condition may arise from the mutation of genes previously unassociated with disease. However, we hypothesized that this could also co-occur with multiple genetic disorders. Demonstrating a complex syndrome caused by multiple disorders, we report two siblings manifesting both similar and disparate signs and symptoms. They shared a history of episodes of hypoglycemia and lactic acidosis, but had differing exam findings and developmental courses. Clinical acumen and exome sequencing combined with biochemical and functional studies identified three genetic conditions. One sibling had Smith-Magenis Syndrome and a nonsense mutation in the RAI1 gene. The second sibling had a de novo mutation in GRIN2B, which resulted in markedly reduced glutamate potency of the encoded receptor. Both siblings had a protein-destabilizing homozygous mutation in PCK1, which encodes the cytosolic isoform of phosphoenolpyruvate carboxykinase (PEPCK-C). In summary, we present the first clinically-characterized mutation of PCK1 and demonstrate that complex medical disorders can represent the co-occurrence of multiple diseases.
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Affiliation(s)
- David R Adams
- Undiagnosed Diseases Program, Office of the Director, National Institutes of Health, Bethesda, MD, USA; Medical Genetics Branch, National Human Genome Research Institute, Bethesda, MD, USA.
| | - Hongjie Yuan
- Department of Pharmacology, Emory University School of Medicine, Rollins Research Center, Atlanta, GA, USA
| | - Todd Holyoak
- Department of Biology, University of Waterloo, Waterloo, ON, Canada
| | - Katrina H Arajs
- Department of Biology, University of Waterloo, Waterloo, ON, Canada
| | - Parvin Hakimi
- Department of Biochemistry, Case Western Reserve University, USA; Department of Pediatrics, Case Western Reserve University, USA
| | - Thomas C Markello
- Undiagnosed Diseases Program, Office of the Director, National Institutes of Health, Bethesda, MD, USA
| | - Lynne A Wolfe
- Undiagnosed Diseases Program, Office of the Director, National Institutes of Health, Bethesda, MD, USA
| | - Thierry Vilboux
- Medical Genetics Branch, National Human Genome Research Institute, Bethesda, MD, USA
| | - Barbara K Burton
- Ann and Robert H. Lurie Children's Hospital, Northwestern University, Chicago, IL, USA; Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
| | - Karin Fuentes Fajardo
- Undiagnosed Diseases Program, Office of the Director, National Institutes of Health, Bethesda, MD, USA
| | - George Grahame
- Center for Inherited Disorders of Energy Metabolism, University Hospitals Case Medical Center, Cleveland, OH, USA
| | - Conisha Holloman
- University of Rochester School of Medicine and Dentistry, Rochester, NY, USA
| | - Murat Sincan
- Undiagnosed Diseases Program, Office of the Director, National Institutes of Health, Bethesda, MD, USA
| | - Ann C M Smith
- Undiagnosed Diseases Program, Office of the Director, National Institutes of Health, Bethesda, MD, USA
| | - Gordon A Wells
- Department of Chemistry, Emory University, Atlanta, GA, USA; Department of Biochemistry, University of Stellenbosch, South Africa
| | - Yan Huang
- Undiagnosed Diseases Program, Office of the Director, National Institutes of Health, Bethesda, MD, USA
| | - Hugo Vega
- Undiagnosed Diseases Program, Office of the Director, National Institutes of Health, Bethesda, MD, USA
| | - James P Snyder
- Department of Chemistry, Emory University, Atlanta, GA, USA
| | - Gretchen A Golas
- Undiagnosed Diseases Program, Office of the Director, National Institutes of Health, Bethesda, MD, USA
| | - Cynthia J Tifft
- Undiagnosed Diseases Program, Office of the Director, National Institutes of Health, Bethesda, MD, USA
| | - Cornelius F Boerkoel
- Undiagnosed Diseases Program, Office of the Director, National Institutes of Health, Bethesda, MD, USA
| | - Richard W Hanson
- Department of Biochemistry, Case Western Reserve University, USA
| | - Stephen F Traynelis
- Department of Pharmacology, Emory University School of Medicine, Rollins Research Center, Atlanta, GA, USA
| | - Douglas S Kerr
- Department of Biochemistry, Case Western Reserve University, USA; Department of Pediatrics, Case Western Reserve University, USA; Center for Inherited Disorders of Energy Metabolism, University Hospitals Case Medical Center, Cleveland, OH, USA
| | - William A Gahl
- Undiagnosed Diseases Program, Office of the Director, National Institutes of Health, Bethesda, MD, USA; Medical Genetics Branch, National Human Genome Research Institute, Bethesda, MD, USA
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Park MJ, Aja S, Li Q, Degano AL, Penati J, Zhuo J, Roe CR, Ronnett GV. Anaplerotic triheptanoin diet enhances mitochondrial substrate use to remodel the metabolome and improve lifespan, motor function, and sociability in MeCP2-null mice. PLoS One 2014; 9:e109527. [PMID: 25299635 PMCID: PMC4192301 DOI: 10.1371/journal.pone.0109527] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Accepted: 09/11/2014] [Indexed: 01/13/2023] Open
Abstract
Rett syndrome (RTT) is an autism spectrum disorder (ASD) caused by mutations in the X-linked MECP2 gene that encodes methyl-CpG binding protein 2 (MeCP2). Symptoms range in severity and include psychomotor disabilities, seizures, ataxia, and intellectual disability. Symptom onset is between 6-18 months of age, a critical period of brain development that is highly energy-dependent. Notably, patients with RTT have evidence of mitochondrial dysfunction, as well as abnormal levels of the adipokines leptin and adiponectin, suggesting overall metabolic imbalance. We hypothesized that one contributor to RTT symptoms is energy deficiency due to defective nutrient substrate utilization by the TCA cycle. This energy deficit would lead to a metabolic imbalance, but would be treatable by providing anaplerotic substrates to the TCA cycle to enhance energy production. We show that dietary therapy with triheptanoin significantly increased longevity and improved motor function and social interaction in male mice hemizygous for Mecp2 knockout. Anaplerotic therapy in Mecp2 knockout mice also improved indicators of impaired substrate utilization, decreased adiposity, increased glucose tolerance and insulin sensitivity, decreased serum leptin and insulin, and improved mitochondrial morphology in skeletal muscle. Untargeted metabolomics of liver and skeletal muscle revealed increases in levels of TCA cycle intermediates with triheptanoin diet, as well as normalizations of glucose and fatty acid biochemical pathways consistent with the improved metabolic phenotype in Mecp2 knockout mice on triheptanoin. These results suggest that an approach using dietary supplementation with anaplerotic substrate is effective in improving symptoms and metabolic health in RTT.
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Affiliation(s)
- Min Jung Park
- The Center for Metabolism and Obesity Research, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
- Department of Neuroscience, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
| | - Susan Aja
- The Center for Metabolism and Obesity Research, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
- Department of Neuroscience, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
- * E-mail:
| | - Qun Li
- The Center for Metabolism and Obesity Research, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
- Department of Neuroscience, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
| | - Alicia L. Degano
- The Center for Metabolism and Obesity Research, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
- Department of Neuroscience, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
- Departamento de Química Biológica, CIQUIBIC-CONICET, Universidad Nacional de Córdoba, Córdoba, Argentina
| | - Judith Penati
- Department of Neuroscience, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
| | - Justin Zhuo
- Department of Neuroscience, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
| | - Charles R. Roe
- The Center for Metabolism and Obesity Research, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
- Department of Neuroscience, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
| | - Gabriele V. Ronnett
- The Center for Metabolism and Obesity Research, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
- Department of Neuroscience, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
- Department of Neurology, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
- Department of Biological Chemistry, The Johns Hopkins University, School of Medicine, Baltimore, MD, United States of America
- Department of Brain Sciences, DGIST, Daegu, South Korea
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145
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Martins E, Figueras A, Novoa B, Santos RS, Moreira R, Bettencourt R. Comparative study of immune responses in the deep-sea hydrothermal vent mussel Bathymodiolus azoricus and the shallow-water mussel Mytilus galloprovincialis challenged with Vibrio bacteria. FISH & SHELLFISH IMMUNOLOGY 2014; 40:485-499. [PMID: 25089010 DOI: 10.1016/j.fsi.2014.07.018] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Revised: 07/08/2014] [Accepted: 07/09/2014] [Indexed: 06/03/2023]
Abstract
The deep-sea hydrothermal vent mussel Bathymodiolus azoricus and the continental European coast Mytilus galloprovincialis are two bivalves species living in highly distinct marine habitats. Mussels are filter-feeding animals that may accumulate rapidly bacteria from the environment. Contact with microorganism is thus inevitable during feeding processes where gill tissues assume a strategic importance at the interface between the external milieu and the internal body cavities promoting interactions with potential pathogens during normal filtration and a constant challenge to their immune system. In the present study B. azoricus and M. galloprovincialis were exposed to Vibrio alginolyticus, Vibrio anguillarum and Vibrio splendidus suspensions and to a mixture of these Vibrio suspensions, in order to ascertain the expression level of immune genes in gill samples, from both mussel species. The immune gene expressions were analyzed by means of quantitative-Polymerase Chain Reaction (qPCR). The gene expression results revealed that these bivalve species exhibit significant expression differences between 12 h and 24 h post-challenge times, and between the Vibrio strains used. V. splendidus induced the strongest gene expression level in the two bivalve species whereas the NF-κB and Aggrecan were the most significantly differentially expressed between the two mussel species. When comparing exposure times, both B. azoricus and M. galloprovincialis showed similar percentage of up-regulated genes at 12 h while a marked increased of gene expression was observed at 24 h for the majority of the immune genes in M. galloprovincialis. This contrasts with B. azoricus where the majority of the immune genes were down-regulated at 24 h. The 24 h post-challenge gene expression results clearly bring new evidence supporting time-dependent transcriptional activities resembling acute phase-like responses and different immune responses build-up in these two mussel species when challenged with Vibrio bacteria. High Pressure Liquid Chromatography (HPLC)-Electrospray ionization mass spectrometry (ESI-MS/MS) analyses resulted in different peptide sequences from B. azoricus and M. galloprovincialis gill tissues suggesting that naïve animals present differences, at the protein synthesis level, in their natural environment. B. azoricus proteins sequences, mostly of endosymbiont origin, were related to metabolic, energy production, protein synthesis processes and nutritional demands whereas in M. galloprovincialis putative protein functions were assumed to be related to structural and cellular integrity and signaling functions.
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Affiliation(s)
- Eva Martins
- Department of Oceanography and Fisheries, University of the Azores (DOP/UAç), Rua Prof. Doutor Frederico Machado, 9901-862 Horta, Portugal; IMAR Institute of Marine Research and LARSyS Laboratory of Robotics and Systems in Engineering and Science, 9901-862 Horta, Azores, Portugal
| | - António Figueras
- Instituto de Investigaciones Marinas, IIM - CSIC. Eduardo Cabello, 6, 36208 Vigo, Spain
| | - Beatriz Novoa
- Instituto de Investigaciones Marinas, IIM - CSIC. Eduardo Cabello, 6, 36208 Vigo, Spain
| | - Ricardo Serrão Santos
- Department of Oceanography and Fisheries, University of the Azores (DOP/UAç), Rua Prof. Doutor Frederico Machado, 9901-862 Horta, Portugal; IMAR Institute of Marine Research and LARSyS Laboratory of Robotics and Systems in Engineering and Science, 9901-862 Horta, Azores, Portugal
| | - Rebeca Moreira
- Instituto de Investigaciones Marinas, IIM - CSIC. Eduardo Cabello, 6, 36208 Vigo, Spain
| | - Raul Bettencourt
- IMAR Institute of Marine Research and LARSyS Laboratory of Robotics and Systems in Engineering and Science, 9901-862 Horta, Azores, Portugal; MARE-Marine and Environmental Science Center, University of the Azores, 9901-862 Horta, Azores, Portugal.
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146
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Tanaka R, Kikutani S, Mahardika A, Matsuda Y. Localization of enzymes relating to C4 organic acid metabolisms in the marine diatom, Thalassiosira pseudonana. PHOTOSYNTHESIS RESEARCH 2014; 121:251-63. [PMID: 24414292 DOI: 10.1007/s11120-014-9968-9] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2013] [Accepted: 12/31/2013] [Indexed: 05/23/2023]
Abstract
In the genome of the marine diatom-Thalassiosira pseudonana, there are several putative genes encoding enzymes potentially constitute a classical C4 type biochemical CO2-concentrating mechanism. Two genes encode a carboxylation enzyme phosphoenolpyruvate carboxylase (PEPC)1 and PEPC2; and another two encode decarboxylation enzymes, NAD(+)-dependent malic enzyme (NAD-ME) and phosphoenolpyruvate carboxykinase (PEPCK). These genes were tagged by the enhanced-green fluorescence protein, egfp, ligated in the transformation vector, and transformed into the cells of T. pseudonana for localization of GFP fusion products. The PEPC1:GFP fusion was localized at the matrix of the periplastidal compartment, while the PEPC2:GFP fusion was localized at the mitochondria. The NAD-ME:GFP fusion was localized in the cytosol and the PEPCK:GFP fusion at the mitochondria. The transcripts level of NAD-ME was extremely low, and PEPCK transcript was significantly induced under the dark, suggesting that PEPCK is involved in the dark metabolism such as respiration and amino acid metabolism in the mitochondria. Treatments of low-CO2grown T. pseudonana cells with inhibitors for PEPCK and PEPC efficiently dissipated the maximum rate of photosynthesis while these treatments did not affect high-affinity photosynthesis. These data strongly suggest that classical C4 enzymes play little role in the CCM in T. pseudonana.
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Affiliation(s)
- Rie Tanaka
- Department of Bioscience, School of Science and Technology, Kwansei Gakuin University, 2-1 Gakuen, Sanda, Hyogo, 669-1337, Japan
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147
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Acute 4-nonylphenol toxicity changes the genomic expression profile of marine medaka fish, Oryzias javanicus. Mol Cell Toxicol 2014. [DOI: 10.1007/s13273-014-0020-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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148
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Luo Q, Hiessl S, Poehlein A, Daniel R, Steinbüchel A. Insights into the microbial degradation of rubber and gutta-percha by analysis of the complete genome of Nocardia nova SH22a. Appl Environ Microbiol 2014; 80:3895-907. [PMID: 24747905 PMCID: PMC4054215 DOI: 10.1128/aem.00473-14] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 04/14/2014] [Indexed: 11/20/2022] Open
Abstract
The complete genome sequence of Nocardia nova SH22a was determined in light of the remarkable ability of rubber and gutta-percha (GP) degradation of this strain. The genome consists of a circular chromosome of 8,348,532 bp with a G+C content of 67.77% and 7,583 predicted protein-encoding genes. Functions were assigned to 72.45% of the coding sequences. Among them, a large number of genes probably involved in the metabolism of xenobiotics and hardly degradable compounds, as well as genes that participate in the synthesis of polyketide- and/or nonribosomal peptide-type secondary metabolites, were detected. Based on in silico analyses and experimental studies, such as transposon mutagenesis and directed gene deletion studies, the pathways of rubber and GP degradation were proposed and the relationship between both pathways was unraveled. The genes involved include, inter alia, genes participating in cell envelope synthesis (long-chain-fatty-acid-AMP ligase and arabinofuranosyltransferase), β-oxidation (α-methylacyl-coenzyme A [α-methylacyl-CoA] racemase), propionate catabolism (acyl-CoA carboxylase), gluconeogenesis (phosphoenolpyruvate carboxykinase), and transmembrane substrate uptake (Mce [mammalian cell entry] transporter). This study not only improves our insights into the mechanism of microbial degradation of rubber and GP but also expands our knowledge of the genus Nocardia regarding metabolic diversity.
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Affiliation(s)
- Quan Luo
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Sebastian Hiessl
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, Münster, Germany
| | - Anja Poehlein
- Department of Genomic and Applied Microbiology and Göttingen Genomics Laboratory, Institut für Mikrobiologie und Genetik, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Rolf Daniel
- Department of Genomic and Applied Microbiology and Göttingen Genomics Laboratory, Institut für Mikrobiologie und Genetik, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Alexander Steinbüchel
- Institut für Molekulare Mikrobiologie und Biotechnologie, Westfälische Wilhelms-Universität Münster, Münster, Germany King Abdulaziz University, Faculty of Biology, Jeddah, Saudi Arabia
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149
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Curthoys NP, Gstraunthaler G. pH-responsive, gluconeogenic renal epithelial LLC-PK1-FBPase+cells: a versatile in vitro model to study renal proximal tubule metabolism and function. Am J Physiol Renal Physiol 2014; 307:F1-F11. [PMID: 24808535 DOI: 10.1152/ajprenal.00067.2014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Ammoniagenesis and gluconeogenesis are prominent metabolic features of the renal proximal convoluted tubule that contribute to maintenance of systemic acid-base homeostasis. Molecular analysis of the mechanisms that mediate the coordinate regulation of the two pathways required development of a cell line that recapitulates these features in vitro. By adapting porcine renal epithelial LLC-PK1 cells to essentially glucose-free medium, a gluconeogenic subline, termed LLC-PK1-FBPase(+) cells, was isolated. LLC-PK1-FBPase(+) cells grow in the absence of hexoses and pentoses and exhibit enhanced oxidative metabolism and increased levels of phosphate-dependent glutaminase. The cells also express significant levels of the key gluconeogenic enzymes, fructose-1,6-bisphosphatase (FBPase) and phosphoenolpyruvate carboxykinase (PEPCK). Thus the altered phenotype of LLC-PK1-FBPase(+) cells is pleiotropic. Most importantly, when transferred to medium that mimics a pronounced metabolic acidosis (9 mM HCO3 (-), pH 6.9), the LLC-PK1-FBPase(+) cells exhibit a gradual increase in NH4 (+) ion production, accompanied by increases in glutaminase and cytosolic PEPCK mRNA levels and proteins. Therefore, the LLC-PK1-FBPase(+) cells retained in culture many of the metabolic pathways and pH-responsive adaptations characteristic of renal proximal tubules. The molecular mechanisms that mediate enhanced expression of the glutaminase and PEPCK in LLC-PK1-FBPase(+) cells have been extensively reviewed. The present review describes novel properties of this unique cell line and summarizes the molecular mechanisms that have been defined more recently using LLC-PK1-FBPase(+) cells to model the renal proximal tubule. It also identifies future studies that could be performed using these cells.
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Affiliation(s)
- Norman P Curthoys
- Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, Colorado; and
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150
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Guo X, García LR. SIR-2.1 integrates metabolic homeostasis with the reproductive neuromuscular excitability in early aging male Caenorhabditis elegans. eLife 2014; 3:e01730. [PMID: 24755287 PMCID: PMC3989601 DOI: 10.7554/elife.01730] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Accepted: 03/16/2014] [Indexed: 01/29/2023] Open
Abstract
The decline of aging C. elegans male's mating behavior is correlated with the increased excitability of the cholinergic circuitry that executes copulation. In this study, we show that the mating circuits' functional durability depends on the metabolic regulator SIR-2.1, a NAD(+)-dependent histone deacetylase. Aging sir-2.1(0) males display accelerated mating behavior decline due to premature hyperexcitability of cholinergic circuits used for intromission and ejaculation. In sir-2.1(0) males, the hypercontraction of the spicule-associated muscles pinch the vas deferens opening, thus blocking sperm release. The hyperexcitability is aggravated by reactive oxygen species (ROS). Our genetic, pharmacological, and behavioral analyses suggest that in sir-2.1(0) and older wild-type males, enhanced catabolic enzymes expression, coupled with the reduced expression of ROS-scavengers contribute to the behavioral decline. However, as a compensatory response to reduce altered catabolism/ROS production, anabolic enzymes expression levels are also increased, resulting in higher gluconeogenesis and lipid synthesis. DOI: http://dx.doi.org/10.7554/eLife.01730.001.
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Affiliation(s)
- Xiaoyan Guo
- Department of Biology, Texas A&M University, College Station, United States
| | - L René García
- Department of Biology, Texas A&M University, College Station, United States
- Howard Hughes Medical Institute, Texas A&M University, Texas, United States
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