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Yang S, Tang W, Azizian A, Gaedcke J, Ohara Y, Cawley H, Hanna N, Ghadimi BM, Lal T, Sen S, Creighton CJ, Gao J, Putluri N, Ambs S, Hussain SP. MIF/NR3C2 Axis Regulates Glucose Metabolism Reprogramming in Pancreatic Cancer through MAPK-ERK and AP-1 Pathways. Carcinogenesis 2024:bgae025. [PMID: 38629149 DOI: 10.1093/carcin/bgae025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2023] [Indexed: 04/20/2024] Open
Abstract
Inflammation and aberrant cellular metabolism are widely recognized as hallmarks of cancer. In pancreatic ductal adenocarcinoma (PDAC), inflammatory signaling and metabolic reprogramming are tightly interwoven, playing pivotal roles in the pathogenesis and progression of the disease. However, the regulatory functions of inflammatory mediators in metabolic reprogramming in pancreatic cancer have not been fully explored. Earlier, we demonstrated that pro-inflammatory mediator macrophage migration inhibitory factor (MIF) enhances disease progression by inhibiting its downstream transcriptional factor nuclear receptor subfamily 3 group C member 2 (NR3C2). Here, we provide evidence that MIF and NR3C2 interactively regulate metabolic reprogramming, resulting in MIF-induced cancer growth and progression in PDAC. MIF positively correlates with the HK1 (hexokinase 1), HK2 (hexokinase 2), and LDHA (lactate dehydrogenase) expression and increased pyruvate and lactate production in PDAC patients. Additionally, MIF augments glucose uptake and lactate efflux by upregulating HK1, HK2 and LDHA expression in pancreatic cancer cells in vitro and in mouse models of PDAC. Conversely, a reduction in HK1, HK2, LDHA expression is observed in tumors with high NR3C2 expression in PDAC patients. NR3C2 suppresses HK1, HK2, and LDHA expression, thereby inhibiting glucose uptake and lactate efflux in pancreatic cancer. Mechanistically, MIF-mediated regulation of glycolytic metabolism involves the activation of MAPK-ERK signaling pathway, whereas NR3C2 interacts with the activator protein 1 (AP-1) to regulate glycolysis. Our findings reveal an interactive role of the MIF/NR3C2 axis in regulating glucose metabolism supporting tumor growth and progression and may be a potential target for designing novel approaches for improving disease outcome.
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Affiliation(s)
- Shouhui Yang
- Pancreatic Cancer Section, CCR, NCI, NIH, Bethesda, MD
| | - Wei Tang
- Laboratory of Human Carcinogenesis, CCR, NCI, NIH, Bethesda, MD
| | - Azadeh Azizian
- Department of General, Visceral and Pediatric Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Jochen Gaedcke
- Department of General, Visceral and Pediatric Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Yuuki Ohara
- Pancreatic Cancer Section, CCR, NCI, NIH, Bethesda, MD
| | - Helen Cawley
- Pancreatic Cancer Section, CCR, NCI, NIH, Bethesda, MD
| | - Nader Hanna
- Division of Surgical Oncology, University of Maryland School of Medicine, Baltimore, MD
| | - B Michael Ghadimi
- Department of General, Visceral and Pediatric Surgery, University Medical Center Göttingen, Göttingen, Germany
| | - Trisha Lal
- Howard University College of Medicine, Washington D.C
| | - Subrata Sen
- Department of Translational Molecular Pathology, University of Texas MD Anderson Cancer Center, Houston, TX
| | - Chad J Creighton
- Dan L. Duncan Comprehensive Cancer Center Division of Biostatistics, Baylor College of Medicine, Houston, TX
| | - Jianjun Gao
- Department of Genitourinary Medical Oncology, University of Texas MD Anderson Cancer Center, Houston, TX
| | - Nagireddy Putluri
- Department of Molecular and Cellular Biology, Dan L. Duncan Comprehensive Cancer Center, Advanced Technology Core, Alkek Center for Molecular Discovery, Baylor College of Medicine, Houston, TX
| | - Stefan Ambs
- Laboratory of Human Carcinogenesis, CCR, NCI, NIH, Bethesda, MD
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Wu X, Zhou Y, Lu Z, Zhang Y, Zhang T. Effect of pre-slaughter fasting time on carcass yield, blood parameters and meat quality in broilers. Anim Biosci 2024; 37:315-322. [PMID: 37946434 PMCID: PMC10766492 DOI: 10.5713/ab.23.0262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Revised: 08/11/2023] [Accepted: 09/12/2023] [Indexed: 11/12/2023] Open
Abstract
OBJECTIVE The aim of this study was to evaluate the effect of pre-slaughter fasting time on carcass yield, meat quality, blood parameters and glucose metabolism in broilers. METHODS Four hundred and fifty Arbor Acres (AA) broilers at 42 days of age were divided into 5 groups with 6 replicates in each group and 15 chickens as one replicate. Following this period, broilers from each group were distributed among five groups according to preslaughter fasting period as 4, 8, 12, 16, or 20 h. RESULTS With increasing fasting time, the carcass yield (p<0.01), the breast muscles yield (p<0.01) and the thigh yield (p<0.01) of the broilers were all linearly increased. With increasing fasting time, the L* values (p<0.01), cooking loss (p = 0.020), moisture content (p<0.01) in the leg muscles linearly downregulated, while the drip loss (p = 0.043), pH45 min (p<0.01) and pH24 h (p<0.01) were linearly upregulated. A trend for a lower (p = 0.071) shear force in the leg muscles was also observed in broilers fasted for longer time. Similar results were also found in breast muscles. The different fasting treatments did not influence the breast muscles glycogen content (p>0.10), while the increase of fasting time resulted in a linear decrease of the blood glucose (p = 0.021) and, more specifically, the glycogen content of the liver and leg muscles (p<0.001). With increasing fasting time, the aspartate transaminase (p<0.01), uric acid (p<0.01), and triglycerides (p<0.01) in serum linearly downregulated, while the alanine aminotransferase was linearly upregulated. CONCLUSION The results of this study show a significant influence of fasting time on carcass yield and meat quality in broilers. Moderate fasting (8 to 12 h) before slaughter can reduce the weight loss of broilers. Prolonged fasting (≥16 h) increased body weight loss, decreased slaughtering performance and fluctuating blood indexes of broilers.
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Affiliation(s)
- Xuezhuang Wu
- College of Animal Science, Anhui Science and Technology University, Fengyang, 233100,
China
| | - Yahao Zhou
- College of Animal Science, Anhui Science and Technology University, Fengyang, 233100,
China
| | - Zhentao Lu
- College of Animal Science, Anhui Science and Technology University, Fengyang, 233100,
China
| | - Yunting Zhang
- College of Animal Science, Anhui Science and Technology University, Fengyang, 233100,
China
| | - Tietao Zhang
- Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun 130112,
China
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Malik DM, Rhoades SD, Zhang SL, Sengupta A, Barber A, Haynes P, Arnadottir ES, Pack A, Kibbey RG, Sehgal A, Weljie AM. Glucose Challenge Uncovers Temporal Fungibility of Metabolic Homeostasis Throughout the Day. bioRxiv 2023:2023.10.30.564837. [PMID: 37961230 PMCID: PMC10634956 DOI: 10.1101/2023.10.30.564837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Rhythmicity is a central feature of behavioral and biological processes including metabolism, however, the mechanisms of metabolite cycling are poorly understood. A robust oscillation in a network of key metabolite pathways downstream of glucose is described in humans, then these pathways mechanistically probed through purpose-built 13C6-glucose isotope tracing in Drosophila every 4h. A temporal peak in biosynthesis was noted by broad labelling of pathways downstream of glucose in wild-type flies shortly following lights on. Krebs cycle labelling was generally increased in a hyperactive mutant (fumin) along with glycolysis labelling primarily observed at dawn. Surprisingly, neither underlying feeding rhythms nor the presence of food explains the rhythmicity of glucose processing across genotypes. These results are consistent with clinical data demonstrating detrimental effects of mis-timed energy intake. This approach provides a window into the dynamic range of metabolic processing ability through the day and mechanistic basis for exploring circadian metabolic homeostasis in disease states.
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Affiliation(s)
- Dania M. Malik
- Pharmacology Graduate Group, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Institute for Translational Medicine and Therapeutics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- These authors contributed equally
| | - Seth D. Rhoades
- Pharmacology Graduate Group, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Institute for Translational Medicine and Therapeutics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Fulgens Consulting, LLC, Cambridge, Massachusetts 02142, USA
- These authors contributed equally
| | - Shirley L. Zhang
- Chronobiology and Sleep Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Howard Hughes Medical Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Department of Cell Biology, Emory University School of Medicine, Atlanta, Georgia 30322, USA
| | - Arjun Sengupta
- Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Institute for Translational Medicine and Therapeutics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Annika Barber
- Chronobiology and Sleep Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Howard Hughes Medical Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Waksman Institute and Department of Molecular Biology and Biochemistry, Rutgers, The State University of New Jersey, New Brunswick, New Jersey 08854, USA
| | - Paula Haynes
- Chronobiology and Sleep Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Howard Hughes Medical Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Erna Sif Arnadottir
- Division of Sleep Medicine, Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Center for Sleep and Circadian Neurobiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Allan Pack
- Division of Sleep Medicine, Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Center for Sleep and Circadian Neurobiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Richard G. Kibbey
- Department of Internal Medicine, Department of Cellular & Molecular Physiology, Yale University School of Medicine, New Haven, Connecticut 06510, USA
| | - Amita Sehgal
- Chronobiology and Sleep Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Howard Hughes Medical Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
| | - Aalim M. Weljie
- Department of Systems Pharmacology and Translational Therapeutics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Institute for Translational Medicine and Therapeutics, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
- Chronobiology and Sleep Institute, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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de Koster EJ, van Engen-van Grunsven ACH, Bussink J, Frielink C, de Geus-Oei LF, Kusters B, Peters H, Oyen WJG, Vriens D. [ 18F]FDG Uptake and Expression of Immunohistochemical Markers Related to Glycolysis, Hypoxia, and Proliferation in Indeterminate Thyroid Nodules. Mol Imaging Biol 2022; 25:483-494. [PMID: 36253663 PMCID: PMC10172288 DOI: 10.1007/s11307-022-01776-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 09/21/2022] [Accepted: 09/23/2022] [Indexed: 11/29/2022]
Abstract
PURPOSE The current study explored the association between 2-[18F]fluoro-2-deoxy-D-glucose ([18F]FDG) uptake and the quantitative expression of immunohistochemical markers related to glucose metabolism, hypoxia, and cell proliferation in benign and malignant thyroid nodules of indeterminate cytology. PROCEDURES Using a case-control design, 24 patients were selected from participants of a randomized controlled multicenter trial (NCT02208544) in which [18F]FDG-PET/CT and thyroid surgery were performed for Bethesda III and IV nodules. Three equally sized groups of [18F]FDG-positive malignant, [18F]FDG-positive benign, and [18F]FDG-negative benign nodules were included. Immunohistochemical staining was performed for glucose transporters (GLUT) 1, 3, and 4; hexokinases (HK) 1 and 2; hypoxia-inducible factor-1 alpha (HIF1α; monocarboxylate transporter 4 (MCT4); carbonic anhydrase IX (CA-IX); vascular endothelial growth factor (VEGF); sodium-iodide symporter (NIS); and Ki-67. Marker expression was scored using an immunoreactive score. Unsupervised cluster analysis was performed. The immunoreactive score was correlated to the maximum and peak standardized uptake values (SUVmax, SUVpeak) and SUVmax ratio (SUVmax of nodule/background SUVmax of contralateral, normal thyroid) of the [18F]FDG-PET/CT using the Spearman's rank correlation coefficient and compared between the three groups using Kruskal-Wallis tests. RESULTS The expression of GLUT1, GLUT3, HK2, and MCT4 was strongly positively correlated with the SUVmax, SUVpeak, and SUVmax ratio. The expression of GLUT1 (p = 0.009), HK2 (p = 0.02), MCT4 (p = 0.01), and VEGF (p = 0.007) was statistically significantly different between [18F]FDG-positive benign nodules, [18F]FDG-positive thyroid carcinomas, and [18F]FDG-negative benign nodules. In both [18F]FDG-positive benign nodules and [18F]FDG-positive thyroid carcinomas, the expression of GLUT1, HK2, and MCT4 was increased as compared to [18F]FDG-negative benign nodules. VEGF expression was higher in [18F]FDG-positive thyroid carcinomas as compared to [18F]FDG-negative and [18F]FDG-positive benign nodules. CONCLUSIONS Our results suggest that [18F]FDG-positive benign thyroid nodules undergo changes in protein expression similar to those in thyroid carcinomas. To expand the understanding of the metabolic changes in benign and malignant thyroid nodules, further research is required, including correlation with underlying genetic alterations.
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Affiliation(s)
- Elizabeth J de Koster
- Department of Medical Imaging, Nuclear Medicine, Radboud University Medical Centre, Nijmegen, the Netherlands.
| | | | - Johan Bussink
- Department of Radiation Oncology, Radiotherapy & OncoImmunology Laboratory, Radboud University Medical Center, Nijmegen, Netherlands
| | - Cathelijne Frielink
- Department of Medical Imaging, Nuclear Medicine, Radboud University Medical Centre, Nijmegen, the Netherlands
| | - Lioe-Fee de Geus-Oei
- Department of Medical Imaging, Nuclear Medicine, Radboud University Medical Centre, Nijmegen, the Netherlands.,Department of Radiology, Section of Nuclear Medicine, Leiden University Medical Center, Leiden, the Netherlands.,Biomedical Photonic Imaging Group, University of Twente, Enschede, the Netherlands
| | - Benno Kusters
- Department of Pathology, Radboud University Medical Centre, Nijmegen, the Netherlands
| | - Hans Peters
- Department of Radiation Oncology, Radiotherapy & OncoImmunology Laboratory, Radboud University Medical Center, Nijmegen, Netherlands
| | - Wim J G Oyen
- Department of Medical Imaging, Nuclear Medicine, Radboud University Medical Centre, Nijmegen, the Netherlands.,Department of Radiology and Nuclear Medicine, Rijnstate Hospital, Arnhem, the Netherlands.,Department of Biomedical Sciences and Humanitas Clinical and Research Centre, Department of Nuclear Medicine, Humanitas University, Milan, Italy
| | - Dennis Vriens
- Department of Radiology, Section of Nuclear Medicine, Leiden University Medical Center, Leiden, the Netherlands
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Rajendran A, Soory A, Khandelwal N, Ratnaparkhi G, Kamat SS. A multi-omics analysis reveals that the lysine deacetylase ABHD14B influences glucose metabolism in mammals. J Biol Chem 2022;:102128. [PMID: 35700823 DOI: 10.1016/j.jbc.2022.102128] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2022] [Revised: 06/08/2022] [Accepted: 06/09/2022] [Indexed: 11/30/2022] Open
Abstract
The sirtuins and histone deacetylases are the best characterized members of the lysine deacetylase (KDAC) enzyme family. Recently, we annotated the “orphan” enzyme ABHD14B (α/β-hydrolase domain containing protein # 14B) as a novel KDAC and showed this enzyme’s ability to transfer an acetyl-group from protein lysine residue(s) to coenzyme-A to yield acetyl-coenzyme-A, thereby, expanding the repertoire of this enzyme family. However, the role of ABHD14B in metabolic processes is not fully elucidated. Here, we investigated the role of this enzyme using mammalian cell knockdowns in a combined transcriptomics and metabolomics analysis. We found from these complementary experiments in vivo that the loss of ABHD14B results in significantly altered glucose metabolism, specifically the decreased flux of glucose through glycolysis and the citric acid cycle. Further, we show that depleting hepatic ABHD14B in mice also results in defective systemic glucose metabolism, particularly during fasting. Taken together, our findings illuminate the important metabolic functions that the KDAC ABHD14B plays in mammalian physiology and poses new questions regarding the role of this hitherto cryptic metabolism-regulating enzyme.
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Sang M, Liu Y, Wu T, Zhou X, Wang D, Sun Z, Qiu S. Association of a novel electrolyte index, SUSPPUP, based on the measurement of fasting serum and spot urinary sodium and potassium, with prediabetes and diabetes in Chinese population. Clin Chim Acta 2022; 531:426-433. [PMID: 35525267 DOI: 10.1016/j.cca.2022.04.1005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 04/18/2022] [Accepted: 04/28/2022] [Indexed: 11/03/2022]
Abstract
BACKGROUND SUSPPUP, calculated as serum sodium [Na+] to urinary Na+ divided by (serum potassium [K+]) 2 to urinary K+, is a composite electrolyte index that reflects renal Na+ retention and K+ excretion. It remains unclear whether SUSPPUP and its components including serum or urinary Na+ or K+, are associated with glucose metabolism. This study aimed to address their associations. METHODS We conducted a cross-sectional study enrolling 5,581 Chinese adults (1,269 with prediabetes, 1,044 with diabetes, and 3,268 with normoglycemia). Fasting serum and morning spot urine were used to measure electrolytes that included Na+ and K+. RESULTS SUSPPUP was higher in prediabetes and diabetes than normoglycemia. The odds of prediabetes and diabetes were increased by 21% and 39% for every 1-standard deviation increment of SUSPPUP after multivariable-adjustment. Multiple linear regression analysis showed that SUSPPUP correlated positively with fasting plasma glucose, 2 h plasma glucose after OGTT, and glycated hemoglobin A1c. Higher spot urinary Na+ was associated with lower odds of prediabetes and diabetes, while spot urinary K+ showed the opposite. CONCLUSION Increases in Na+ retention and K+ excretion in the kidney, as reflected by an elevated SUSPPUP, are associated with increased prevalence of prediabetes and diabetes in Chinese community-dwellers.
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Affiliation(s)
- Miaomiao Sang
- Department of Endocrinology, Zhongda Hospital, Institute of Diabetes, School of Medicine, Southeast University, Nanjing, China
| | - Yu Liu
- Department of Endocrinology, Zhongda Hospital, Institute of Diabetes, School of Medicine, Southeast University, Nanjing, China
| | - Tongzhi Wu
- Adelaide Medical School and Centre of Research Excellence (CRE) in Translating Nutritional Science to Good Health, The University of Adelaide, Adelaide, Australia
| | - Xiaoying Zhou
- Department of Endocrinology, Zhongda Hospital, Institute of Diabetes, School of Medicine, Southeast University, Nanjing, China
| | - Duolao Wang
- Liverpool School of Tropical Medicine, Liverpool, UK
| | - Zilin Sun
- Department of Endocrinology, Zhongda Hospital, Institute of Diabetes, School of Medicine, Southeast University, Nanjing, China.
| | - Shanhu Qiu
- Department of General Practice, Zhongda Hospital, Institute of Diabetes, School of Medicine, Southeast University, Nanjing, China.
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Chen Q, Wu C, Yao Z, Cai L, Ni Y, Mao S. Elevated thyroid hormones caused by high concentrate diets participate in hepatic metabolic disorders in dairy cows. Anim Biosci 2022; 35:1184-1194. [PMID: 34991199 PMCID: PMC9262717 DOI: 10.5713/ab.21.0397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Accepted: 12/17/2021] [Indexed: 11/27/2022] Open
Abstract
Objective High concentrate diets are widely used to satisfy high-yielding dairy cows; however, long-term feeding of high concentrate diets can cause subacute ruminal acidosis (SARA). The endocrine disturbance is one of the important reasons for metabolic disorders caused by SARA. However, there is no current report about thyroid hormones involved in liver metabolic disorders induced by a high concentrate diet. Methods In this study, 12 mid-lactating dairy cows were randomly assigned to HC (high concentrate) group (60% concentrate of dry matter, n = 6) and LC (low concentrate) group (40% concentrate of dry matter, n = 6). All cows were slaughtered on the 21st day, and the samples of blood and liver were collected to analyze the blood biochemistry, histological changes, thyroid hormones, and the expression of genes and proteins. Results Compared with LC group, HC group showed decreased serum triglyceride, free fatty acid, total cholesterol, low-density lipoprotein cholesterol, increased hepatic glycogen, and glucose. For glucose metabolism, the gene and protein expression of glucose-6-phosphatase and phosphoenolpyruvate carboxykinase 1 in the liver were significantly up-regulated in HC group. For lipid metabolism, the expression of sterol regulatory element-binding protein 1, long-chain acyl-CoA synthetase 1, and fatty acid synthase in the liver was decreased in HC group, whereas carnitine palmitoyltransferase 1α and peroxisome proliferator activated receptor α were increased. Serum triiodothyronine, thyroxin, free triiodothyronine (FT3), and hepatic FT3 increased in HC group, accompanied by increased expression of thyroid hormone receptor (THR) in the liver. Conclusion Taken together, thyroid hormones may increase hepatic gluconeogenesis, β-oxidation and reduce fatty acid synthesis through the THR pathway to participate in the metabolic disorders caused by a high concentrate diet.
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Affiliation(s)
- Qu Chen
- Key Laboratory of Animal Physiology & Biochemistry, Nanjing Agricultural University, Nanjing 210095, China
| | - Chen Wu
- Key Laboratory of Animal Physiology & Biochemistry, Nanjing Agricultural University, Nanjing 210095, China
| | - Zhihao Yao
- Key Laboratory of Animal Physiology & Biochemistry, Nanjing Agricultural University, Nanjing 210095, China
| | - Liuping Cai
- Key Laboratory of Animal Physiology & Biochemistry, Nanjing Agricultural University, Nanjing 210095, China
| | - Yingdong Ni
- Key Laboratory of Animal Physiology & Biochemistry, Nanjing Agricultural University, Nanjing 210095, China
| | - Shengyong Mao
- Laboratory of Gastrointestinal Microbiology, Jiangsu Key Laboratory of Gastrointestinal Nutrition and Animal Health, College of Animal Science and Technology, Nanjing Agricultural University, Nanjing 210095, China
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An S, Parajuli P, Kennedy EL, Kyoung M. Multi-dimensional Fluorescence Live-Cell Imaging for Glucosome Dynamics in Living Human Cells. Methods Mol Biol 2022; 2487:15-26. [PMID: 35687227 PMCID: PMC9191769 DOI: 10.1007/978-1-0716-2269-8_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Fluorescence live-cell imaging that has contributed to our understanding of cell biology is now at the frontline of studying quantitative biochemistry in a cell. Particularly, technological advancements of fluorescence live-cell imaging and associated strategies in recent years have allowed us to discover various subcellular macromolecular assemblies in living human cells. Here we describe how real-time dynamics of a multienzyme metabolic assembly, the "glucosome," that is responsible for regulating glucose flux at subcellular levels, has been investigated in both 2- and 3-dimensional space of single human cells. We envision that such multi-dimensional fluorescence live-cell imaging will continue to revolutionize our understanding of how intracellular metabolic pathways and their network are functionally orchestrated at single-cell levels.
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Affiliation(s)
- Songon An
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County (UMBC), 1000 Hilltop Circle, Baltimore, MD 21250,Program in Oncology, Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland, Baltimore, MD 21201,Corresponding authors: &
| | - Prakash Parajuli
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County (UMBC), 1000 Hilltop Circle, Baltimore, MD 21250
| | - Erin L. Kennedy
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County (UMBC), 1000 Hilltop Circle, Baltimore, MD 21250
| | - Minjoung Kyoung
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County (UMBC), 1000 Hilltop Circle, Baltimore, MD 21250,Program in Oncology, Marlene and Stewart Greenebaum Comprehensive Cancer Center, University of Maryland, Baltimore, MD 21201,Corresponding authors: &
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Jee D, Park S. Hyperglycemia and Hypo-HDL-cholesterolemia Are Primary Risk Factors for Age-related Cataract, and a Korean-style Balanced Diet has a Negative Association, based on the Korean Genome and Epidemiology Study. J Korean Med Sci 2021; 36:e155. [PMID: 34128595 PMCID: PMC8203849 DOI: 10.3346/jkms.2021.36.e155] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 05/10/2021] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND The prevalence of cataracts is steadily increasing among the middle-aged and elderly worldwide. We hypothesized that adults aged > 50 years with age-related cataracts (ARCs) have an association with metabolic syndrome (MS) and its components, and MS has interactions with different dietary patterns and lifestyles that affect ARC risk. We examined the hypothesis using the Korean Genome and Epidemiology Study (KoGES; a large-scale hospital-based cohort study), which collected data between 2004-2013. METHODS Participants ≥ 50 years old were classified as cases (1,972 ARC patients) and controls (38,290 healthy controls) based on a diagnosis of cataract by a physician. MS and its components were defined using WHO definitions for Asians. Dietary consumption was evaluated using a validated semi-quantitative food frequency questionnaire (SQFFQ), which contained 106 foods, and dietary patterns were analyzed by principal component analysis. After adjusting for potential covariates, logistic regression was used to investigate associations between MS and its components and between dietary patterns and a positive cataract history. RESULTS ARC had a positive association with MS after 1.32-fold adjusting for age, sex, residence area, body mass index, and energy intake. Plasma glucose and HbA1c concentrations exhibited an increased ARC risk in the participants with MS by 1.50- and 1.92-fold and without MS by 1.35 and 1.88-fold, respectively. Serum high-density lipoprotein (HDL) concentrations were negatively associated with ARC risk only in the MS patients, but not without MS. However, blood pressure, abdominal obesity, and serum triglyceride concentrations did not associate with ARC risk regardless of MS. High intake of a Korean-balanced diet (KBD) containing fermented food exhibited a negative association with ARC risk (OR = 0.81) only in the MS group. The fat and coffee intake had a negative association with ARC only in the non-MS group. Current- and former-smokers were positively associated with ARC risk. CONCLUSION Persons who have hyperglycemia and low-HDL-cholesterolemia had increased susceptibility of ARC prevalence. A KBD with a proper amount of fat (≥ 15%) is recommended, and smoking should be prohibited.
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Affiliation(s)
- Donghyun Jee
- Division of Vitreous and Retina, Department of Ophthalmology, St. Vincent's Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea
| | - Sunmin Park
- Food and Nutrition, Obesity/Diabetes Research Center, Hoseo University, Asan, Korea.
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Chen H, Gao S, Liu W, Wong CC, Wu J, Wu J, Liu D, Gou H, Kang W, Zhai J, Li C, Su H, Wang S, Soares F, Han J, He HH, Yu J. RNA N 6-Methyladenosine Methyltransferase METTL3 Facilitates Colorectal Cancer by Activating the m 6A-GLUT1-mTORC1 Axis and Is a Therapeutic Target. Gastroenterology 2021; 160:1284-1300.e16. [PMID: 33217448 DOI: 10.1053/j.gastro.2020.11.013] [Citation(s) in RCA: 145] [Impact Index Per Article: 48.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Revised: 10/21/2020] [Accepted: 11/10/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND & AIMS RNA N6-methyladenosine (m6A) modification has recently emerged as a new regulatory mechanism in cancer progression. We aimed to explore the role of the m6A regulatory enzyme METTL3 in colorectal cancer (CRC) pathogenesis and its potential as a therapeutic target. METHODS The expression and clinical implication of METTL3 were investigated in multiple human CRC cohorts. The underlying mechanisms of METTL3 in CRC were investigated by integrative m6A sequencing, RNA sequencing, and ribosome profiling analyses. The efficacy of targeting METTL3 in CRC treatment was elucidated in CRC cell lines, patient-derived CRC organoids, and Mettl3-knockout mouse models. RESULTS Using targeted clustered regularly interspaced short palindromic repeats (CRISPR)/Cas9 dropout screening, we identified METTL3 as the top essential m6A regulatory enzyme in CRC. METTL3 was overexpressed in 62.2% (79/127) and 88.0% (44/50) of primary CRCs from 2 independent cohorts. High METTL3 expression predicted poor survival in patients with CRC (n = 374, P < .01). Functionally, silencing METTL3 suppressed tumorigenesis in CRC cells, human-derived primary CRC organoids, and Mettl3-knockout mouse models. We discovered the novel functional m6A methyltransferase domain of METTL3 in CRC cells by domain-focused CRISPR screening and mutagenesis assays. Mechanistically, METTL3 directly induced the m6A-GLUT1-mTORC1 axis as identified by integrated m6A sequencing, RNA sequencing, ribosome sequencing, and functional validation. METTL3 induced GLUT1 translation in an m6A-dependent manner, which subsequently promoted glucose uptake and lactate production, leading to the activation of mTORC1 signaling and CRC development. Furthermore, inhibition of mTORC1 potentiated the anticancer effect of METTL3 silencing in CRC patient-derived organoids and METTL3 transgenic mouse models. CONCLUSIONS METTL3 promotes CRC by activating the m6A-GLUT1-mTORC1 axis. METTL3 is a promising therapeutic target for the treatment of CRC.
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Affiliation(s)
- Huarong Chen
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong
| | - Shanshan Gao
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong
| | - Weixin Liu
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong
| | - Chi-Chun Wong
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong
| | - Jianfeng Wu
- State Key Laboratory of Cellular Stress Biology and School of Life Sciences, Xiamen University, Xiamen, China
| | - Jingtong Wu
- State Key Laboratory of Cellular Stress Biology and School of Life Sciences, Xiamen University, Xiamen, China
| | - Dabin Liu
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong
| | - Hongyan Gou
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong
| | - Wei Kang
- Department of Anatomical and Cellular Pathology, State Key Laboratory of Oncology in South China, Prince of Wales Hospital, The Chinese University of Hong Kong, Hong Kong
| | - Jianning Zhai
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong
| | - Chuangen Li
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong
| | - Hao Su
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong
| | - Shiyan Wang
- Princess Margaret Cancer Centre, University Health Network, Department of Medical Biophysics, University of Toronto, Toronto, Canada
| | - Fraser Soares
- Princess Margaret Cancer Centre, University Health Network, Department of Medical Biophysics, University of Toronto, Toronto, Canada
| | - Jiahuai Han
- State Key Laboratory of Cellular Stress Biology and School of Life Sciences, Xiamen University, Xiamen, China
| | - Housheng Hansen He
- Princess Margaret Cancer Centre, University Health Network, Department of Medical Biophysics, University of Toronto, Toronto, Canada
| | - Jun Yu
- Institute of Digestive Disease and Department of Medicine and Therapeutics, State Key laboratory of Digestive Disease, Li Ka Shing Institute of Health Sciences, Shenzhen Research Institute, The Chinese University of Hong Kong, Hong Kong.
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11
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Gong Y, Liu J, Xue Y, Zhuang Z, Qian S, Zhou W, Li X, Qian J, Ding G, Sun Z. Non-monotonic dose-response effects of arsenic on glucose metabolism. Toxicol Appl Pharmacol 2019; 377:114605. [PMID: 31170414 DOI: 10.1016/j.taap.2019.114605] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 05/29/2019] [Accepted: 05/31/2019] [Indexed: 01/08/2023]
Abstract
BACKGROUND Inorganic arsenic (iAs) is a widespread environmental toxin. In addition to being a human carcinogen, its effect on diabetes has started to gain recognition recently. Insulin is the key hormone regulating systemic glucose metabolism. The in vivo effect of iAs on insulin sensitivity has not been directly addressed. OBJECTIVES Here we use mouse models to dissect the dose-dependent effects of iAs on glucose metabolism in vivo. METHODS We performed hyperinsulinemic-euglycemic clamp, the gold standard analysis of systemic insulin sensitivity. We also performed dynamic metabolic testings and RNA-seq analysis. RESULTS We found that a low-dose exposure (0.25 ppm iAs in drinking water) caused glucose intolerance in adult male C57BL/6 mice, likely by disrupting glucose-induced insulin secretion without affecting peripheral insulin sensitivity. However, a higher-dose exposure (2.5 ppm iAs) had diminished effects on glucose tolerance despite disrupted pancreatic insulin secretion. Insulin Clamp analysis showed that 2.5 ppm iAs actually enhanced systemic insulin sensitivity by simultaneously enhancing insulin-stimulated glucose uptake in skeletal muscles and improved insulin-mediated suppression of endogenous glucose production. RNA-seq analysis of skeletal muscles revealed that 2.5 ppm iAs regulated expression of many genes involved in the metabolism of fatty acids, pyruvate, and amino acids. CONCLUSION These findings suggest that iAs has opposite glycemic effects on distinct metabolic tissues at different dose thresholds. Such non-monotonic dose-response effects of iAs on glucose tolerance shed light on the complex interactions between iAs and the systemic glucose metabolism, which could potentially help reconcile some of the conflicting results in human epidemiological studies.
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Affiliation(s)
- Yingyun Gong
- Department of Endocrinology and Metabolism, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China; Department of Medicine-Endocrinology, Baylor College of Medicine, Houston, TX, United States of America
| | - Jidong Liu
- Department of Medicine-Endocrinology, Baylor College of Medicine, Houston, TX, United States of America
| | - Yanfeng Xue
- Department of Medicine-Endocrinology, Baylor College of Medicine, Houston, TX, United States of America
| | - Zhong Zhuang
- Department of Medicine-Endocrinology, Baylor College of Medicine, Houston, TX, United States of America
| | - Sichong Qian
- Department of Medicine-Endocrinology, Baylor College of Medicine, Houston, TX, United States of America
| | - Wenjun Zhou
- Department of Medicine-Endocrinology, Baylor College of Medicine, Houston, TX, United States of America
| | - Xin Li
- Department of Medicine-Endocrinology, Baylor College of Medicine, Houston, TX, United States of America
| | - Justin Qian
- Department of Medicine-Endocrinology, Baylor College of Medicine, Houston, TX, United States of America
| | - Guolian Ding
- Department of Medicine-Endocrinology, Baylor College of Medicine, Houston, TX, United States of America; The International Peace Maternity and Child Health Hospital, Institute of Embryo-Fetal Original Adult Disease, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
| | - Zheng Sun
- Department of Medicine-Endocrinology, Baylor College of Medicine, Houston, TX, United States of America; Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, United States of America.
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Clayton ZS, Fusco E, Schreiber L, Carpenter JN, Hooshmand S, Hong MY, Kern M. Snack selection influences glucose metabolism, antioxidant capacity and cholesterol in healthy overweight adults: A randomized parallel arm trial. Nutr Res 2019; 65:89-98. [PMID: 30952505 DOI: 10.1016/j.nutres.2019.03.002] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2019] [Revised: 02/26/2019] [Accepted: 03/01/2019] [Indexed: 12/18/2022]
Abstract
Including carbohydrate/fructose-rich foods (predominantly fruit) in the diets of overweight individuals can improve chronic disease risk factors. We hypothesized dried plums (DP) would improve nutrient consumption, total antioxidant capacity (TAC), lipid and adipokine profiles, and would decrease adiposity and inflammation. To test this, we studied the effects of 8-weeks of twice-daily snacking of macronutrient-matched 100kcal servings of DP or refined carbohydrate-rich snack (low-fat muffins: LFM) on daily energy and nutrient consumption, and chronic disease risk factors in overweight adults. Body weight/composition, waist circumference, blood pressure, plasma glucose, insulin, c-peptide, lipids, TAC, adipokines and inflammation were measured at baseline and throughout the study. Postprandial glucose and insulin were assessed following assigned test foods at baseline and 8-weeks. Repeated measures ANOVAs were undertaken to examine group and time differences. Post-hoc independent and paired samples t-tests were conducted where necessary. DP increased (P<.05) overall intake of dietary fiber and potassium, and TAC, from baseline to 8-weeks. Baseline postprandial glycemia tended (P=.09) to be lower with DP versus LFM, while both groups had a decreased response after 8-weeks. Postprandial insulinemia was lower (P<.05) for DP at both time-points. No differences in body weight/composition, blood pressure, or fasting glucose, insulin, triglycerides, total cholesterol, HDL-C, inflammation or adipokines were detected. Low-density lipoprotein cholesterol (LDL-C) increased (P<.05) throughout the trial following LFM. Overall, DP lessened postprandial insulinemia, improved nutrient consumption and plasma TAC, and maintained plasma LDL-C compared to a macronutrient-matched refined carbohydrate snack, which could decrease chronic disease risk.
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Affiliation(s)
- Zachary S Clayton
- San Diego State University, Department of Exercise and Nutritional Sciences, 5500 Campanile Drive, San Diego, CA 92182.
| | - Elizabeth Fusco
- San Diego State University, Department of Exercise and Nutritional Sciences, 5500 Campanile Drive, San Diego, CA 92182.
| | - Lisa Schreiber
- San Diego State University, Department of Exercise and Nutritional Sciences, 5500 Campanile Drive, San Diego, CA 92182.
| | - Jennifer N Carpenter
- San Diego State University, Department of Exercise and Nutritional Sciences, 5500 Campanile Drive, San Diego, CA 92182.
| | - Shirin Hooshmand
- San Diego State University, Department of Exercise and Nutritional Sciences, 5500 Campanile Drive, San Diego, CA 92182.
| | - Mee Young Hong
- San Diego State University, Department of Exercise and Nutritional Sciences, 5500 Campanile Drive, San Diego, CA 92182.
| | - Mark Kern
- San Diego State University, Department of Exercise and Nutritional Sciences, 5500 Campanile Drive, San Diego, CA 92182.
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Zhang J, Gelman IH, Katsuta E, Liang Y, Wang X, Li J, Qu J, Yan L, Takabe K, Hochwald SN. Glucose Drives Growth Factor-Independent Esophageal Cancer Proliferation via Phosphohistidine-Focal Adhesion Kinase Signaling. Cell Mol Gastroenterol Hepatol 2019; 8:37-60. [PMID: 30836148 PMCID: PMC6518323 DOI: 10.1016/j.jcmgh.2019.02.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Revised: 02/22/2019] [Accepted: 02/25/2019] [Indexed: 12/20/2022]
Abstract
BACKGROUND & AIMS Most targeted therapies against cancer are designed to block growth factor-stimulated oncogenic growth. However, response rates are low, and resistance to therapy is high. One mechanism might relate to the ability of tumor cells to induce growth factor-independent proliferation (GFIP). This project aims to understand how (1) cancer cells preferentially derive a major growth advantage by using critical metabolic products of glucose, such as phosphoenolpyruvate (PEP), to drive proliferation and (2) esophageal squamous cell carcinoma (ESCC) cells, but not esophageal adenocarcinoma cells, can induce GFIP by using glycolysis to activate phosphohistidine (poHis)-mediated signaling through focal adhesion kinase (FAK). METHODS The hypothesis to be tested is that ESCC GFIP induced by glucose is facilitated by PEP-mediated histidine phosphorylation (poHis) of FAK, leading to the possibility that ESCC progression can be targeted by blocking poHis signaling. Biochemical, molecular biological, and in vivo experiments including bromodeoxyuridine/5-ethynyl-2'-deoxyuridine labeling, radioisotope tracing, CRISPR gene editing, and analysis of signaling gene sets in human cancer tissues and xenograft models were performed to define the mechanisms underlying ESCC GFIP. RESULTS Glucose promotes growth factor-independent DNA replication and accumulation of PEP in ESCC cells. PEP is the direct phospho-donor to poHis58-FAK within a known "HG" motif for histidine phosphorylation. Glucose-induced poHis58 promotes growth factor-independent FAK-mediated proliferation. Furthermore, glucose activates phosphatidylinositol-3'-kinase/AKT via poHis58-FAK signaling. Non-phosphorylatable His58A-FAK reduces xenograft growth. CONCLUSIONS Glucose induces ESCC, but not esophageal adenocarcinoma GFIP via PEP-His58-FAK-AKT signaling. ESCC progression is controlled by actionable growth factor-independent, glucose-induced pathways that regulate proliferation through novel histidine phosphorylation of FAK.
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Affiliation(s)
- Jianliang Zhang
- Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, New York
| | - Irwin H. Gelman
- Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, New York
| | - Eriko Katsuta
- Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, New York
| | - Yuanzi Liang
- Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, New York
| | - Xue Wang
- Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, New York
| | - Jun Li
- University at Buffalo School of Medicine and Biomedical Sciences, Buffalo, New York
| | - Jun Qu
- University at Buffalo School of Medicine and Biomedical Sciences, Buffalo, New York
| | - Li Yan
- Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, New York
| | - Kazuaki Takabe
- Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, New York
| | - Steven N. Hochwald
- Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Buffalo, New York,Correspondence Address correspondence to: Steven N. Hochwald, MD, Department of Surgical Oncology, Roswell Park Comprehensive Cancer Center, Elm and Carlton Streets, Buffalo, New York 14263. fax: (716) 845-1060.
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14
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Wang X, Hu WH, Zhang K, Zhou JJ, Liu DF, Zhang MY, Zhang JG. Acute Fornix Deep Brain Stimulation Improves Hippocampal Glucose Metabolism in Aged Mice. Chin Med J (Engl) 2018; 131:594-599. [PMID: 29483395 PMCID: PMC5850677 DOI: 10.4103/0366-6999.226067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Background: A beneficial memory effect of acute fornix deep brain stimulation (DBS) has been reported in clinical studies. The aim of this study was to investigate the acute changes in glucose metabolism induced by fornix DBS. Methods: First, the Morris water maze test and novel object recognition memory test were used to confirm declined memory in aged mice (C57BL/6, 20–22 months old). Then, four groups of mice were used as follows: aged mice with stimulation (n = 12), aged mice with sham-stimulation (n = 8), adult mice (3–4 months old) with stimulation (n = 12), and adult mice with sham-stimulation (n = 8). Ipsilateral hippocampal glucose metabolism and glutamate levels were measured in vivo by microdialysis before, during, and after fornix DBS treatment. Histological staining was used to verify the localization of electrodes and mice with inaccurate placement were excluded from subsequent analyses. The effects of fornix DBS on extracellular glucose, lactate, pyruvate, and glutamate levels over time were analyzed by repeated-measures analysis of variance followed by Fisher's least significant difference post hoc test. Results: The aged mice had a higher basal lactate/pyruvate ratio (LPR) and lactate/glucose ratio (LGR) than the adult mice (LPR: 0.34 ± 0.04 vs. 0.13 ± 0.02, t = 4.626, P < 0.0001; LGR: 6.06 ± 0.59 vs. 4.14 ± 0.36, t = 2.823, P < 0.01). Fornix DBS decreased the ipsilateral hippocampal pyruvate and lactate levels (P < 0.05), but the glucose levels were not obviously changed in aged mice. Similarly, the LGR and LPR also decreased in aged mice after fornix DBS treatment (P < 0.05). Glucose metabolism in adult mice was not significantly influenced by fornix DBS. In addition, fornix DBS significantly decreased the ipsilateral hippocampal extracellular levels of glutamate in aged mice (P < 0.05), while significant alterations were not found in the adult mice. Conclusions: The present study provides experimental evidence that fornix DBS could significantly improve hippocampal glucose metabolism in aged mice by promoting cellular aerobic respiration activity.
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Affiliation(s)
- Xiu Wang
- Department of Neurosurgery, Beijing Tian Tan Hospital, Capital Medical University, Beijing 100050, China
| | - Wen-Han Hu
- Stereotactic and Functional Neurosurgery Laboratory, Beijing Neurosurgical Institute, Capital Medical University; Beijing Key Laboratory of Neurostimulation, Beijing 100050, China
| | - Kai Zhang
- Department of Neurosurgery, Beijing Tian Tan Hospital, Capital Medical University; Beijing Key Laboratory of Neurostimulation, Beijing 100050, China
| | - Jun-Jian Zhou
- Department of Neurosurgery, Beijing Tian Tan Hospital, Capital Medical University, Beijing 100050, China
| | - De-Feng Liu
- Department of Neurosurgery, Beijing Tian Tan Hospital, Capital Medical University, Beijing 100050, China
| | - Mei-Yu Zhang
- Experimental Research Center, China Academy of Traditional Chinese Medicine, Beijing 100700, China
| | - Jian-Guo Zhang
- Department of Neurosurgery, Beijing Tian Tan Hospital, Capital Medical University; Stereotactic and Functional Neurosurgery Laboratory, Beijing Neurosurgical Institute, Capital Medical University; Beijing Key Laboratory of Neurostimulation, Beijing 100050, China
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15
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Jian Z, Cheng T, Zhang Z, Raulefs S, Shi K, Steiger K, Maeritz N, Kleigrewe K, Hofmann T, Benitz S, Bruns P, Lamp D, Jastroch M, Akkan J, Jäger C, Huang P, Nie S, Shen S, Zou X, Ceyhan GO, Michalski CW, Friess H, Kleeff J, Kong B. Glycemic Variability Promotes Both Local Invasion and Metastatic Colonization by Pancreatic Ductal Adenocarcinoma. Cell Mol Gastroenterol Hepatol 2018; 6:429-449. [PMID: 30258965 PMCID: PMC6154439 DOI: 10.1016/j.jcmgh.2018.07.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Accepted: 07/17/2018] [Indexed: 12/15/2022]
Abstract
Background & Aims Although nearly half of pancreatic ductal adenocarcinoma (PDAC) patients have diabetes mellitus with episodes of hyperglycemia, its tumor microenvironment is hypoglycemic. Thus, it is crucial for PDAC cells to develop adaptive mechanisms dealing with oscillating glucose levels. So far, the biological impact of such glycemic variability on PDAC biology remains unknown. Methods Murine PDAC cells were cultured in low- and high-glucose medium to investigate the molecular, biochemical, and metabolic influence of glycemic variability on tumor behavior. A set of in vivo functional assays including orthotopic implantation and portal and tail vein injection were used. Results were further confirmed on tissues from PDAC patients. Results Glycemic variability has no significant effect on PDAC cell proliferation. Hypoglycemia is associated with local invasion and angiogenesis, whereas hyperglycemia promotes metastatic colonization. Increased metastatic colonization under hyperglycemia is due to increased expression of runt related transcription factor 3 (Runx3), which further activates expression of collagen, type VI, alpha 1 (Col6a1), forming a glycemic pro-metastatic pathway. Through epigenetic machinery, retinoic acid receptor beta (Rarb) expression fluctuates according to glycemic variability, acting as a critical sensor relaying the glycemic signal to Runx3/Col6a1. Moreover, the signal axis of Rarb/Runx3/Col6a1 is pharmaceutically accessible to a widely used antidiabetic substance, metformin, and Rar modulator. Finally, PDAC tissues from patients with diabetes show an increased expression of COL6A1. Conclusions Glycemic variability promotes both local invasion and metastatic colonization of PDAC. A pro-metastatic signal axis Rarb/Runx3/Col6a1 whose activity is controlled by glycemic variability is identified. The therapeutic relevance of this pathway needs to be explored in PDAC patients, especially in those with diabetes.
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Key Words
- 2DG, 2-deoxy-D-glucose
- ADP, adenosine diphosphate
- ATP, adenosine triphosphate
- CT, computed tomography
- Caix, carbonic anhydrase IX
- Col6a1, collagen
- ECM, extracellular matrix
- Egr2, early growth response 2
- FBS, fetal bovine serum
- Glucose Metabolism
- IHC, immunohistochemistry
- Metastasis
- PBS, phosphate-buffered saline
- PCR, polymerase chain reaction
- PDAC, pancreatic ductal adenocarcinoma
- PET, positron emission tomography
- Pancreatic Cancer
- RA, retinoic acid
- Rarb, retinoic acid receptor beta
- Retinoic Acid
- Runx3, runt related transcription factor 3
- qRT-PCR, quantitative real-time polymerase chain reaction
- type VI, alpha 1
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Affiliation(s)
- Ziying Jian
- Department of Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich (TUM), Munich, Germany
| | - Tao Cheng
- Department of Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich (TUM), Munich, Germany
| | - Zhiheng Zhang
- Department of Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich (TUM), Munich, Germany
| | - Susanne Raulefs
- Department of Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich (TUM), Munich, Germany
| | - Kuangyu Shi
- Department of Nuclear Medicine, TUM, Munich, Germany
| | | | - Nadja Maeritz
- Department of Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich (TUM), Munich, Germany
| | - Karin Kleigrewe
- Bavarian Center for Biomolecular Mass Spectrometry, Freising, Germany
| | - Thomas Hofmann
- Bavarian Center for Biomolecular Mass Spectrometry, Freising, Germany
| | - Simone Benitz
- Department of Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich (TUM), Munich, Germany
- Medizinische Klinik und Poliklinik II, Klinikum der LMU, Munich, Germany
| | - Philipp Bruns
- Division of Applied Bioinformatics, German Cancer Research Center, Heidelberg, Germany
| | - Daniel Lamp
- Helmholtz Diabetes Center, Helmholtz Zentrum München, Neuherberg, Germany
- German Center for Diabetes Research, Helmholtz Zentrum München, Neuherberg, Germany
- Division of Metabolic Diseases, TUM, Munich, Germany
| | - Martin Jastroch
- Helmholtz Diabetes Center, Helmholtz Zentrum München, Neuherberg, Germany
- German Center for Diabetes Research, Helmholtz Zentrum München, Neuherberg, Germany
| | - Jan Akkan
- Department of Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich (TUM), Munich, Germany
| | - Carsten Jäger
- Department of Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich (TUM), Munich, Germany
| | - Peilin Huang
- Department of Pathology, School of Medicine, Southeast University, Nanjing, China
| | - Shuang Nie
- Department of Gastroenterology, Affiliated Drum Tower Hospital of Nanjing University, Medical School, Nanjing, China
| | - Shanshan Shen
- Department of Gastroenterology, Affiliated Drum Tower Hospital of Nanjing University, Medical School, Nanjing, China
| | - Xiaoping Zou
- Department of Gastroenterology, Affiliated Drum Tower Hospital of Nanjing University, Medical School, Nanjing, China
| | - Güralp O. Ceyhan
- Department of Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich (TUM), Munich, Germany
| | - Christoph W. Michalski
- Department of Visceral, Vascular and Endocrine Surgery, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Helmut Friess
- Department of Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich (TUM), Munich, Germany
| | - Jörg Kleeff
- Department of Visceral, Vascular and Endocrine Surgery, Martin-Luther-University Halle-Wittenberg, Halle, Germany
| | - Bo Kong
- Department of Surgery, Klinikum rechts der Isar, School of Medicine, Technical University of Munich (TUM), Munich, Germany
- Department of Gastroenterology, Affiliated Drum Tower Hospital of Nanjing University, Medical School, Nanjing, China
- German Cancer Consortium (DKTK) at the partner site Munich, Munich, Germany
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Liu JM, Wu PF, Rao J, Zhou J, Shen ZC, Luo H, Huang JG, Liang X, Long LH, Xie QG, Jiang FC, Wang F, Chen JG. ST09, a Novel Thioester Derivative of Tacrine, Alleviates Cognitive Deficits and Enhances Glucose Metabolism in Vascular Dementia Rats. CNS Neurosci Ther 2016; 22:220-9. [PMID: 26813743 DOI: 10.1111/cns.12495] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 10/30/2015] [Accepted: 11/18/2015] [Indexed: 01/31/2023] Open
Abstract
AIMS Chemical entities containing mercapto group have been increasingly attractive in the therapy of central nerve system (CNS) diseases. In the recent study, we screened a series of mercapto-tacrine derivatives with synergistic neuropharmacological profiles in vitro. METHODS We investigated the effect and mechanism of ST09, a thioester derivative of tacrine containing a potential mercapto group, on the vascular dementia (VaD) model of rat induced by bilateral common carotid arteries occlusion (2-VO). RESULTS ST09 and its active metabolite ST10 retained excellent inhibition on acetylcholinesterase (AChE) activity. ST09 significantly attenuated the 2-VO-induced impairment in spatial acquisition performance and inhibited the 2-VO-induced rise of AChE activity. In the VaD model, ST09 attenuated the oxidative stress and decreased the apoptosis in the cortex and hippocampus. Compared with donepezil, ST09 exhibited a better effect on the regeneration of free thiols in 2-VO rats. Interestingly, ST09, not donepezil, greatly improved glucose metabolism in various brain regions of 2-VO rats using functional imaging of (18) F-labeled fluoro-deoxyglucose (FDG) positron emission tomography (PET). CONCLUSIONS ST09 may serve as a more promising agent for the therapy of VaD than tacrine owing to the introduction of a potential mercapto group into the parent skeleton.
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Affiliation(s)
- Jian-Min Liu
- Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Peng-Fei Wu
- Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,The Key Laboratory for Drug Target Researches and Pharmacodynamic Evaluation of Hubei Province, Wuhan, China.,Laboratory of Neuropsychiatric Diseases, The Institute of Brain Research, Huazhong University of Science and Technology, Wuhan, China
| | - Jing Rao
- Department of Pharmaceutics, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jun Zhou
- Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Zu-Cheng Shen
- Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Han Luo
- Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jian-Geng Huang
- Department of Pharmaceutics, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiao Liang
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China
| | - Li-Hong Long
- Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,The Key Laboratory for Drug Target Researches and Pharmacodynamic Evaluation of Hubei Province, Wuhan, China.,Laboratory of Neuropsychiatric Diseases, The Institute of Brain Research, Huazhong University of Science and Technology, Wuhan, China
| | - Qing-Guo Xie
- Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, China
| | - Feng-Chao Jiang
- Department of Medicinal Chemistry, School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Fang Wang
- Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,The Key Laboratory for Drug Target Researches and Pharmacodynamic Evaluation of Hubei Province, Wuhan, China.,Laboratory of Neuropsychiatric Diseases, The Institute of Brain Research, Huazhong University of Science and Technology, Wuhan, China
| | - Jian-Guo Chen
- Department of Pharmacology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,The Key Laboratory for Drug Target Researches and Pharmacodynamic Evaluation of Hubei Province, Wuhan, China.,Laboratory of Neuropsychiatric Diseases, The Institute of Brain Research, Huazhong University of Science and Technology, Wuhan, China.,The Collaborative Innovation Center for Brain Science, Wuhan, China
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17
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Burgos SA, Chandurkar V, Tsoukas MA, Chevalier S, Morais JA, Lamarche M, Marliss EB. Insulin resistance of protein anabolism accompanies that of glucose metabolism in lean, glucose-tolerant offspring of persons with type 2 diabetes. BMJ Open Diabetes Res Care 2016; 4:e000312. [PMID: 27933189 PMCID: PMC5129107 DOI: 10.1136/bmjdrc-2016-000312] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Revised: 10/28/2016] [Accepted: 11/06/2016] [Indexed: 01/13/2023] Open
Abstract
OBJECTIVE To test whether protein anabolic resistance is an early defect in type 2 diabetes (T2D). RESEARCH DESIGN AND METHODS Seven lean, normoglycemic T2D offspring (T2D-O) and eight matched participants without family history (controls; C) underwent a 3-hour hyperinsulinemic (40 mU/m2/min), euglycemic (5.5 mmol/L) and isoaminoacidemic clamp. Whole-body glucose and protein kinetics were measured with d-[3-3H]glucose and l-[l-13C]leucine, respectively. Plasma amino acids were measured by liquid chromatography-tandem mass spectrometry. RESULTS Fasting glycemia and glucose kinetic variables did not differ between groups. Clamp decreases in glucose rate of appearance were not different, but rate of disappearance increased 29% less in T2D-O, to a significantly lower rate. Fasting leucine was higher in T2D-O, but kinetics did not differ. Clamp increases in leucine oxidation and decreases in endogenous rate of appearance (protein breakdown) were equal, but in T2D-O, non-oxidative rate of disappearance (protein synthesis) did not increase and net balance (synthesis-breakdown) did not become positive as in C. CONCLUSIONS Resistance of whole-body protein anabolism (synthesis and net balance) accompanies resistance of glucose uptake in T2D-O. Mechanisms responsible, possible roles in the increased risk of developing diabetes, and its potential impact on long-term protein balance require definition.
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Affiliation(s)
- Sergio A Burgos
- Crabtree Nutrition Laboratories, Division of Endocrinology and Metabolism, Department of Medicine, McGill University Health Centre Research Institute, Montreal, Quebec, Canada
- Department of Animal Science, Faculty of Agricultural and Environmental Sciences, McGill University, Montreal, Sainte-Anne-de-Bellevue, Quebec, Canada
| | - Vikram Chandurkar
- Division of Endocrinology, Memorial University of Newfoundland, St. John's, Newfoundland and Labrador, Canada
| | - Michael A Tsoukas
- Crabtree Nutrition Laboratories, Division of Endocrinology and Metabolism, Department of Medicine, McGill University Health Centre Research Institute, Montreal, Quebec, Canada
| | - Stéphanie Chevalier
- Crabtree Nutrition Laboratories, Division of Endocrinology and Metabolism, Department of Medicine, McGill University Health Centre Research Institute, Montreal, Quebec, Canada
| | - José A Morais
- Crabtree Nutrition Laboratories, Division of Endocrinology and Metabolism, Department of Medicine, McGill University Health Centre Research Institute, Montreal, Quebec, Canada
| | - Marie Lamarche
- Crabtree Nutrition Laboratories, Division of Endocrinology and Metabolism, Department of Medicine, McGill University Health Centre Research Institute, Montreal, Quebec, Canada
| | - Errol B Marliss
- Crabtree Nutrition Laboratories, Division of Endocrinology and Metabolism, Department of Medicine, McGill University Health Centre Research Institute, Montreal, Quebec, Canada
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18
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Abstract
INTRODUCTION Female sexual interest and arousal disorder is personally distressing for women. To better understand the mechanism of the candidate therapeutic, flibanserin, we determined its effects on an index of brain glucose metabolism. AIM We hypothesized that chronic treatment with flibanserin would alter metabolism in brain regions associated with serotonergic function and female sexual behavior. METHODS In a crossover design, eight adult female common marmosets (Calithrix jacchus) received daily flibanserin or vehicle. After 7-12 weeks of treatment, the glucose metabolism radiotracer [(18) F]fluorodeoxyglucose (FDG) was administered to each female immediately prior to 30 minutes of interaction with her male pairmate, after which females were anesthetized and imaged by positron emission tomography. Whole-brain normalized images were analyzed with anatomically defined regions of interest. Whole-brain voxelwise mapping was used to explore treatment effects. Correlations were examined between alterations in metabolism and pairmate social grooming. MAIN OUTCOME MEASURES Changes in metabolism associated with flibanserin were determined for dorsal raphe, medial prefrontal cortex (mPFC), medial preoptic area of hypothalamus (mPOA), ventromedial nucleus of hypothalamus, and field cornu ammonis 1 (CA1) of the hippocampus. RESULTS In response to chronic flibanserin, metabolism in mPOA declined, and this reduction correlated with increases in pairmate grooming. A cluster of voxels in frontal cortico-limbic regions exhibited reduced metabolism in response to flibanserin and overlapped with a voxel cluster in which reductions in metabolism correlated with increases in pairmate grooming. Finally, reductions in mPOA metabolism correlated with increases in metabolism in a cluster of voxels in somatosensory cortex. CONCLUSIONS Taken together, these results suggest that flibanserin-induced reductions in female mPOA neural activity increase intimate affiliative behavior with male pairmates.
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Affiliation(s)
| | - Yves Aubert
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, US
- Department of Biological and Medical Psychology, University of Bergen, NO
| | - Kelly A. Allers
- Department of CNS Diseases, Boehringer Ingelheim, Biberach, DE
| | - Bernd Sommer
- Department of CNS Diseases, Boehringer Ingelheim, Biberach, DE
| | - David H. Abbott
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, US
- Department of Obstetrics and Gynecology, University of Wisconsin-Madison, US
- Endocrinology-Reproductive Physiology Training Program, University of Wisconsin-Madison, US
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19
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Muhič M, Vardjan N, Chowdhury HH, Zorec R, Kreft M. Insulin and Insulin-like Growth Factor 1 (IGF-1) Modulate Cytoplasmic Glucose and Glycogen Levels but Not Glucose Transport across the Membrane in Astrocytes. J Biol Chem 2015; 290:11167-76. [PMID: 25792745 DOI: 10.1074/jbc.m114.629063] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Indexed: 01/21/2023] Open
Abstract
Astrocytes contain glycogen, an energy buffer, which can bridge local short term energy requirements in the brain. Glycogen levels reflect a dynamic equilibrium between glycogen synthesis and glycogenolysis. Many factors that include hormones and neuropeptides, such as insulin and insulin-like growth factor 1 (IGF-1) likely modulate glycogen stores in astrocytes, but detailed mechanisms at the cellular level are sparse. We used a glucose nanosensor based on Förster resonance energy transfer to monitor cytosolic glucose concentration with high temporal resolution and a cytochemical approach to determine glycogen stores in single cells. The results show that after glucose depletion, glycogen stores are replenished. Insulin and IGF-1 boost the process of glycogen formation. Although astrocytes appear to express glucose transporter GLUT4, glucose entry across the astrocyte plasma membrane is not affected by insulin. Stimulation of cells with insulin and IGF-1 decreased cytosolic glucose concentration, likely because of elevated glucose utilization for glycogen synthesis.
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Affiliation(s)
- Marko Muhič
- From the Laboratory of Neuroendocrinology-Molecular Cell Physiology, Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Zaloška 4, 1000 Ljubljana, Slovenia
| | - Nina Vardjan
- From the Laboratory of Neuroendocrinology-Molecular Cell Physiology, Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Zaloška 4, 1000 Ljubljana, Slovenia, Celica Biomedical, 1000 Ljubljana, Slovenia, and
| | - Helena H Chowdhury
- From the Laboratory of Neuroendocrinology-Molecular Cell Physiology, Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Zaloška 4, 1000 Ljubljana, Slovenia, Celica Biomedical, 1000 Ljubljana, Slovenia, and
| | - Robert Zorec
- From the Laboratory of Neuroendocrinology-Molecular Cell Physiology, Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Zaloška 4, 1000 Ljubljana, Slovenia, Celica Biomedical, 1000 Ljubljana, Slovenia, and
| | - Marko Kreft
- From the Laboratory of Neuroendocrinology-Molecular Cell Physiology, Institute of Pathophysiology, Faculty of Medicine, University of Ljubljana, Zaloška 4, 1000 Ljubljana, Slovenia, Celica Biomedical, 1000 Ljubljana, Slovenia, and the Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, 1000 Ljubljana, Slovenia
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20
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Walton RG, Zhu B, Unal R, Spencer M, Sunkara M, Morris AJ, Charnigo R, Katz WS, Daugherty A, Howatt DA, Kern PA, Finlin BS. Increasing adipocyte lipoprotein lipase improves glucose metabolism in high fat diet-induced obesity. J Biol Chem 2015; 290:11547-56. [PMID: 25784555 DOI: 10.1074/jbc.m114.628487] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Indexed: 01/26/2023] Open
Abstract
Lipid accumulation in liver and skeletal muscle contributes to co-morbidities associated with diabetes and obesity. We made a transgenic mouse in which the adiponectin (Adipoq) promoter drives expression of lipoprotein lipase (LPL) in adipocytes to potentially increase adipose tissue lipid storage. These mice (Adipoq-LPL) have improved glucose and insulin tolerance as well as increased energy expenditure when challenged with a high fat diet (HFD). To identify the mechanism(s) involved, we determined whether the Adipoq-LPL mice diverted dietary lipid to adipose tissue to reduce peripheral lipotoxicity, but we found no evidence for this. Instead, characterization of the adipose tissue of the male mice after HFD challenge revealed that the mRNA levels of peroxisome proliferator-activated receptor-γ (PPARγ) and a number of PPARγ-regulated genes were higher in the epididymal fat pads of Adipoq-LPL mice than control mice. This included adiponectin, whose mRNA levels were increased, leading to increased adiponectin serum levels in the Adipoq-LPL mice. In many respects, the adipose phenotype of these animals resembles thiazolidinedione treatment except for one important difference, the Adipoq-LPL mice did not gain more fat mass on HFD than control mice and did not have increased expression of genes in adipose such as glycerol kinase, which are induced by high affinity PPAR agonists. Rather, there was selective induction of PPARγ-regulated genes such as adiponectin in the adipose of the Adipoq-LPL mice, suggesting that increasing adipose tissue LPL improves glucose metabolism in diet-induced obesity by improving the adipose tissue phenotype. Adipoq-LPL mice also have increased energy expenditure.
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Affiliation(s)
- R Grace Walton
- From the Department of Medicine, Division of Endocrinology, Barnstable Brown Diabetes and Obesity Center
| | - Beibei Zhu
- From the Department of Medicine, Division of Endocrinology, Barnstable Brown Diabetes and Obesity Center
| | - Resat Unal
- the Department of Molecular Biology and Genetics, Faculty of Life Sciences, Mugla Sitki Kocman University, 48000 Mugla, Turkey
| | - Michael Spencer
- From the Department of Medicine, Division of Endocrinology, Barnstable Brown Diabetes and Obesity Center
| | | | | | | | - Wendy S Katz
- Department of Pharmacology and Nutritional Sciences, and
| | - Alan Daugherty
- Saha Cardiovascular Research Center, University of Kentucky, Lexington, Kentucky 40536 and
| | - Deborah A Howatt
- Saha Cardiovascular Research Center, University of Kentucky, Lexington, Kentucky 40536 and
| | - Philip A Kern
- From the Department of Medicine, Division of Endocrinology, Barnstable Brown Diabetes and Obesity Center
| | - Brian S Finlin
- From the Department of Medicine, Division of Endocrinology, Barnstable Brown Diabetes and Obesity Center,
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21
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Tan SX, Fisher-Wellman KH, Fazakerley DJ, Ng Y, Pant H, Li J, Meoli CC, Coster ACF, Stöckli J, James DE. Selective insulin resistance in adipocytes. J Biol Chem 2015; 290:11337-48. [PMID: 25720492 DOI: 10.1074/jbc.m114.623686] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Indexed: 12/14/2022] Open
Abstract
Aside from glucose metabolism, insulin regulates a variety of pathways in peripheral tissues. Under insulin-resistant conditions, it is well known that insulin-stimulated glucose uptake is impaired, and many studies attribute this to a defect in Akt signaling. Here we make use of several insulin resistance models, including insulin-resistant 3T3-L1 adipocytes and fat explants prepared from high fat-fed C57BL/6J and ob/ob mice, to comprehensively distinguish defective from unaffected aspects of insulin signaling and its downstream consequences in adipocytes. Defective regulation of glucose uptake was observed in all models of insulin resistance, whereas other major actions of insulin such as protein synthesis and anti-lipolysis were normal. This defect corresponded to a reduction in the maximum response to insulin. The pattern of change observed for phosphorylation in the Akt pathway was inconsistent with a simple defect at the level of Akt. The only Akt substrate that showed consistently reduced phosphorylation was the RabGAP AS160 that regulates GLUT4 translocation. We conclude that insulin resistance in adipose tissue is highly selective for glucose metabolism and likely involves a defect in one of the components regulating GLUT4 translocation to the cell surface in response to insulin.
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Affiliation(s)
- Shi-Xiong Tan
- From the Garvan Institute of Medical Research, Darlinghurst, Sydney, New South Wales 2010, Australia
| | - Kelsey H Fisher-Wellman
- From the Garvan Institute of Medical Research, Darlinghurst, Sydney, New South Wales 2010, Australia
| | | | - Yvonne Ng
- From the Garvan Institute of Medical Research, Darlinghurst, Sydney, New South Wales 2010, Australia
| | - Himani Pant
- From the Garvan Institute of Medical Research, Darlinghurst, Sydney, New South Wales 2010, Australia
| | - Jia Li
- From the Garvan Institute of Medical Research, Darlinghurst, Sydney, New South Wales 2010, Australia
| | - Christopher C Meoli
- From the Garvan Institute of Medical Research, Darlinghurst, Sydney, New South Wales 2010, Australia, the Charles Perkins Centre, School of Molecular Biosciences and
| | - Adelle C F Coster
- the School of Mathematics and Statistics, University of New South Wales, Sydney, New South Wales 2052, Australia
| | | | - David E James
- the Charles Perkins Centre, School of Molecular Biosciences and the School of Medicine, University of Sydney, New South Wales 2006, Australia, and
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22
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Kanda A, Noda K, Ishida S. ATP6AP2/(pro)renin receptor contributes to glucose metabolism via stabilizing the pyruvate dehydrogenase E1 β subunit. J Biol Chem 2015; 290:9690-700. [PMID: 25720494 DOI: 10.1074/jbc.m114.626713] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Indexed: 12/27/2022] Open
Abstract
Aerobic glucose metabolism is indispensable for metabolically active cells; however, the regulatory mechanism of efficient energy generation in the highly evolved mammalian retina remains incompletely understood. Here, we revealed an unsuspected role for (pro)renin receptor, also known as ATP6AP2, in energy metabolism. Immunoprecipitation and mass spectrometry analyses identified the pyruvate dehydrogenase (PDH) complex as Atp6ap2-interacting proteins in the mouse retina. Yeast two-hybrid assays demonstrated direct molecular binding between ATP6AP2 and the PDH E1 β subunit (PDHB). Pdhb immunoreactivity co-localized with Atp6ap2 in multiple retinal layers including the retinal pigment epithelium (RPE). ATP6AP2 knockdown in RPE cells reduced PDH activity, showing a predilection to anaerobic glycolysis. ATP6AP2 protected PDHB from phosphorylation, thus controlling its protein stability. Down-regulated PDH activity due to ATP6AP2 knockdown inhibited glucose-stimulated oxidative stress in RPE cells. Our present data unraveled the novel function of ATP6AP2/(P)RR as a PDHB stabilizer, contributing to aerobic glucose metabolism together with oxidative stress.
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Affiliation(s)
- Atsuhiro Kanda
- From the Department of Ophthalmology, Laboratory of Ocular Cell Biology and Visual Science, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan
| | - Kousuke Noda
- From the Department of Ophthalmology, Laboratory of Ocular Cell Biology and Visual Science, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan
| | - Susumu Ishida
- From the Department of Ophthalmology, Laboratory of Ocular Cell Biology and Visual Science, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan
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23
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Bayle K, Akoka S, Remaud GS, Robins RJ. Nonstatistical 13C distribution during carbon transfer from glucose to ethanol during fermentation is determined by the catabolic pathway exploited. J Biol Chem 2015; 290:4118-28. [PMID: 25538251 PMCID: PMC4326821 DOI: 10.1074/jbc.m114.621441] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2014] [Revised: 12/22/2014] [Indexed: 11/06/2022] Open
Abstract
During the anaerobic fermentation of glucose to ethanol, the three micro-organisms Saccharomyces cerevisiae, Zymomonas mobilis, and Leuconostoc mesenteroides exploit, respectively, the Embden-Meyerhof-Parnas, the Entner-Doudoroff, and the reductive pentose phosphate pathways. Thus, the atoms incorporated into ethanol do not have the same affiliation to the atomic positions in glucose. The isotopic fractionation occurring in each pathway at both the methylene and methyl positions of ethanol has been investigated by isotopic quantitative (13)C NMR spectrometry with the aim of observing whether an isotope redistribution characteristic of the enzymes active in each pathway can be measured. First, it is found that each pathway has a unique isotope redistribution signature. Second, for the methylene group, a significant apparent kinetic isotope effect is only found in the reductive pentose phosphate pathway. Third, the apparent kinetic isotope effects related to the methyl group are more pronounced than for the methylene group. These findings can (i) be related to known kinetic isotope effects of some of the enzymes concerned and (ii) give indicators as to which steps in the pathways are likely to be influencing the final isotopic composition in the ethanol.
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Affiliation(s)
- Kevin Bayle
- From the Elucidation of Biosynthesis by Isotopic Spectrometry Group, CEISAM, UMR 6230, CNRS-University of Nantes, BP 99208, F-44322 Nantes, France
| | - Serge Akoka
- From the Elucidation of Biosynthesis by Isotopic Spectrometry Group, CEISAM, UMR 6230, CNRS-University of Nantes, BP 99208, F-44322 Nantes, France
| | - Gérald S Remaud
- From the Elucidation of Biosynthesis by Isotopic Spectrometry Group, CEISAM, UMR 6230, CNRS-University of Nantes, BP 99208, F-44322 Nantes, France
| | - Richard J Robins
- From the Elucidation of Biosynthesis by Isotopic Spectrometry Group, CEISAM, UMR 6230, CNRS-University of Nantes, BP 99208, F-44322 Nantes, France
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24
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Li K, Zhang J, Yu J, Liu B, Guo Y, Deng J, Chen S, Wang C, Guo F. MicroRNA-214 suppresses gluconeogenesis by targeting activating transcriptional factor 4. J Biol Chem 2015; 290:8185-95. [PMID: 25657009 DOI: 10.1074/jbc.m114.633990] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Although the gluconeogenesis pathway is already a target for the treatment of type 2 diabetes, the potential role of microRNAs (miRNAs) in gluconeogenesis remains unclear. Here, we investigated the physiological functions of miR-214 in gluconeogenesis. The expression of miR-214 was suppressed by glucagon via protein kinase A signaling in primary hepatocytes, and miR-214 was down-regulated in the livers of fasted, high fat diet-induced diabetic and leptin receptor-mutated (db/db) mice. The overexpression of miR-214 in primary hepatocytes suppressed glucose production, and silencing miR-214 reversed this effect. Gluconeogenesis was suppressed in the livers of mice injected with an adenovirus expressing miR-214 (Ad-miR-214). Additionally, Ad-miR-214 alleviated high fat diet-induced elevation of gluconeogenesis and hyperglycemia. Furthermore, we found that activating transcription factor 4 (ATF4), a reported target of miR-214, can reverse the suppressive effect of miR-214 on gluconeogenesis in primary hepatocytes, and this suppressive effect was blocked in liver-specific ATF4 knock-out mice. ATF4 regulated gluconeogenesis via affecting forkhead box protein O1 (FOXO1) transcriptional activity. Finally, liver-specific miR-214 transgenic mice exhibited suppressed gluconeogenesis and reduced expression of ATF4, phosphoenolpyruvate carboxykinase, and glucose-6-phosphatase in liver. Taken together, our results suggest that the miR-214-ATF4 axis is a novel pathway for the regulation of hepatic gluconeogenesis.
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Affiliation(s)
- Kai Li
- From the Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031 and
| | - Jin Zhang
- the Key Laboratory of Molecular Medicine, Ministry of Education, Institute of Medical Sciences, Department of Biochemistry and Molecular Biology, Shanghai Medical College, Fudan University, 130 Dongan Road, Shanghai 200032, China
| | - Junjie Yu
- From the Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031 and
| | - Bin Liu
- From the Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031 and
| | - Yajie Guo
- From the Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031 and
| | - Jiali Deng
- From the Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031 and
| | - Shanghai Chen
- From the Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031 and
| | - Chunxia Wang
- From the Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031 and
| | - Feifan Guo
- From the Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, University of Chinese Academy of Sciences, 320 Yueyang Road, Shanghai 200031 and
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25
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Matsuoka TA, Kaneto H, Kawashima S, Miyatsuka T, Tochino Y, Yoshikawa A, Imagawa A, Miyazaki JI, Gannon M, Stein R, Shimomura I. Preserving Mafa expression in diabetic islet β-cells improves glycemic control in vivo. J Biol Chem 2015; 290:7647-57. [PMID: 25645923 DOI: 10.1074/jbc.m114.595579] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The murine Mafa transcription factor is a key regulator of postnatal islet β-cell activity, affecting insulin transcription, insulin secretion, and β-cell mass. Human MAFA expression is also markedly decreased in islet β-cells of type 2 diabetes mellitus (T2DM) patients. Moreover, levels are profoundly reduced in db/db islet β-cells, a mouse model of T2DM. To examine the significance of this key islet β-cell-enriched protein to glycemic control under diabetic conditions, we generated transgenic mice that conditionally and specifically produced Mafa in db/db islet β-cells. Sustained expression of Mafa resulted in significantly lower plasma glucose levels, higher plasma insulin, and augmented islet β-cell mass. In addition, there was increased expression of insulin, Slc2a2, and newly identified Mafa-regulated genes involved in reducing β-cell stress, like Gsta1 and Gckr. Importantly, the levels of human GSTA1 were also compromised in T2DM islets. Collectively, these results illustrate how consequential the reduction in Mafa activity is to islet β-cell function under pathophysiological conditions.
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Affiliation(s)
| | | | | | | | | | | | | | - Jun-ichi Miyazaki
- the Division of Stem Cell Regulation Research, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan
| | - Maureen Gannon
- the Department of Medicine, Division of Diabetes, Endocrinology, and Metabolism, Vanderbilt University Medical Center, Nashville, Tennessee 37232-6303, and
| | - Roland Stein
- the Department of Molecular Physiology & Biophysics, Vanderbilt University Medical School, Nashville, Tennessee 37232
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26
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Ando Y, Shinozawa Y, Iijima Y, Yu BC, Sone M, Ooi Y, Watanaka Y, Chida K, Hakuno F, Takahashi SI. Tumor necrosis factor (TNF)-α-induced repression of GKAP42 protein levels through cGMP-dependent kinase (cGK)-Iα causes insulin resistance in 3T3-L1 adipocytes. J Biol Chem 2015; 290:5881-92. [PMID: 25586176 DOI: 10.1074/jbc.m114.624759] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
Insulin receptor substrates (IRSs) have been shown to be major mediators of insulin signaling. Recently, we found that IRSs form high-molecular weight complexes, and here, we identify by yeast two-hybrid screening a novel IRS-1-associated protein: a 42-kDa cGMP-dependent protein kinase-anchoring protein (GKAP42). GKAP42 knockdown in 3T3-L1 adipocytes suppressed insulin-dependent IRS-1 tyrosine phosphorylation and downstream signaling, resulting in suppression of GLUT4 translocation to plasma membrane induced by insulin. In addition, GLUT4 translocation was also suppressed in cells overexpressing GKAP42-N (the IRS-1 binding region of GKAP42), which competed with GKAP42 for IRS-1, indicating that GKAP42 binding to IRS-1 is required for insulin-induced GLUT4 translocation. Long term treatment of 3T3-L1 adipocytes with TNF-α, which induced insulin resistance, significantly decreased the GKAP42 protein level. We then investigated the roles of cGMP-dependent kinase (cGK)-Iα, which bound to GKAP42, in these changes. cGK-Iα knockdown partially rescued TNF-α-induced decrease in GKAP42 and impairment of insulin signals. These data indicated that TNF-α-induced repression of GKAP42 via cGK-Iα caused reduction of insulin-induced IRS-1 tyrosine phosphorylation at least in part. The present study describes analysis of the novel TNF-α-induced pathway, cGK-Iα-GKAP42, which regulates insulin-dependent signals and GLUT4 translocation.
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Affiliation(s)
- Yasutoshi Ando
- From the Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Yusuke Shinozawa
- From the Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Yumi Iijima
- From the Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Bu-Chin Yu
- From the Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Meri Sone
- From the Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Yuko Ooi
- From the Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Yusuke Watanaka
- From the Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Kazuhiro Chida
- From the Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Fumihiko Hakuno
- From the Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Shin-Ichiro Takahashi
- From the Departments of Animal Sciences and Applied Biological Chemistry, Graduate School of Agriculture and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo 113-8657, Japan
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27
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Meng S, Cao J, He Q, Xiong L, Chang E, Radovick S, Wondisford FE, He L. Metformin activates AMP-activated protein kinase by promoting formation of the αβγ heterotrimeric complex. J Biol Chem 2014; 290:3793-802. [PMID: 25538235 DOI: 10.1074/jbc.m114.604421] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Metformin is the most widely prescribed oral anti-diabetic agent. Recently, we have shown that low metformin concentrations found in the portal vein suppress glucose production in hepatocytes through activation of AMPK. Moreover, low concentrations of metformin were found to activate AMPK by increasing the phosphorylation of AMPKα at Thr-172. However, the mechanism underlying the increase in AMPKα phosphorylation at Thr-172 and activation by metformin remains unknown. In the current study, we find that low concentrations of metformin promote the formation of the AMPK αβγ complex, resulting in an increase in net phosphorylation of the AMPK α catalytic subunit at Thr-172 by augmenting phosphorylation by LKB1 and antagonizing dephosphorylation by PP2C.
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Affiliation(s)
| | - Jia Cao
- From the Divisions of Metabolism and
| | - Qiyi He
- From the Divisions of Metabolism and
| | | | | | - Sally Radovick
- Endocrinology, Departments of Pediatrics, Physiology, and Medicine, Johns Hopkins University School of Medicine, Baltimore, Maryland 21287
| | | | - Ling He
- From the Divisions of Metabolism and
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28
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Abstract
Living organisms adapt to environmental changes through metabolic homeostasis. Sugars are used primarily for the metabolic production of ATP energy and carbon sources. Trehalose is a nonreducing disaccharide that is present in many organisms. In insects, the principal hemolymph sugar is trehalose instead of glucose. As in mammals, hemolymph sugar levels in Drosophila are regulated by the action of endocrine hormones. Therefore, the mobilization of trehalose to glucose is thought to be critical for metabolic homeostasis. However, the physiological role of trehalose as a hemolymph sugar during insect development remains largely unclear. Here, we demonstrate that mutants of the trehalose-synthesizing enzyme Tps1 failed to produce trehalose as expected but survived into the late pupal period and died before eclosion. Larvae without trehalose grew normally, with a slight reduction in body size, under normal food conditions. However, these larvae were extremely sensitive to starvation, possibly due to a local defect in the central nervous system. Furthermore, Tps1 mutant larvae failed to grow on a low-sugar diet and exhibited severe growth defects on a low-protein diet. These diet-dependent phenotypes of Tps1 mutants demonstrate the critical role of trehalose during development in Drosophila and reveal how animals adapt to changes in nutrient availability.
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Affiliation(s)
- Hiroko Matsuda
- From the Laboratory for Growth Control Signaling, RIKEN Center for Developmental Biology, Chuo-ku, Kobe, Hyogo 650-0047 and
| | - Takayuki Yamada
- From the Laboratory for Growth Control Signaling, RIKEN Center for Developmental Biology, Chuo-ku, Kobe, Hyogo 650-0047 and
| | - Miki Yoshida
- From the Laboratory for Growth Control Signaling, RIKEN Center for Developmental Biology, Chuo-ku, Kobe, Hyogo 650-0047 and the Graduate School of Biological Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0101, Japan
| | - Takashi Nishimura
- From the Laboratory for Growth Control Signaling, RIKEN Center for Developmental Biology, Chuo-ku, Kobe, Hyogo 650-0047 and the Graduate School of Biological Science, Nara Institute of Science and Technology, Ikoma, Nara 630-0101, Japan
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Abstract
Alzheimer׳s disease (AD) is the most common cause of dementia in North America. Growing evidence supports the concept that AD is a metabolic disease mediated by impairments in brain insulin responsiveness, glucose utilization, and energy metabolism, which lead to increased oxidative stress, inflammation, and worsening of insulin resistance. In addition, metabolic derangements directly contribute to the structural, functional, molecular, and biochemical abnormalities that characterize AD, including neuronal loss, synaptic disconnection, tau hyperphosphorylation, and amyloid-beta accumulation. Because the fundamental abnormalities in AD represent effects of brain insulin resistance and deficiency, and the molecular and biochemical consequences overlap with Type 1 and Type 2 diabetes, we suggest the term "Type 3 diabetes" to account for the underlying abnormalities associated with AD-type neurodegeneration. In light of the rapid increases in sporadic AD prevalence rates and vastly expanded use of nitrites and nitrates in foods and agricultural products over the past 30-40 years, the potential role of nitrosamine exposures as mediators of Type 3 diabetes is discussed.
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Affiliation(s)
- Suzanne M de la Monte
- Departments of Medicine, Pathology, Neurology, and Neurosurgery, Rhode Island Hospital and the Warren Alpert Medical School of Brown University, 55 Claverick Street, Room 419, Providence, RI 02903, USA.
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30
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Lee S, Zhang C, Liu X. Role of glucose metabolism and ATP in maintaining PINK1 levels during Parkin-mediated mitochondrial damage responses. J Biol Chem 2014; 290:904-17. [PMID: 25404737 DOI: 10.1074/jbc.m114.606798] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Mutations in several genes, including PINK1 and Parkin, are known to cause autosomal recessive cases of Parkinson disease in humans. These genes operate in the same pathway and play a crucial role in mitochondrial dynamics and maintenance. PINK1 is required to recruit Parkin to mitochondria and initiate mitophagy upon mitochondrial depolarization. In this study, we show that PINK1-dependent Parkin mitochondrial recruitment in response to global mitochondrial damage by carbonyl cyanide m-chlorophenylhydrazine (CCCP) requires active glucose metabolism. Parkin accumulation on mitochondria and subsequent Parkin-dependent mitophagy is abrogated in glucose-free medium or in the presence of 2-deoxy-D-glucose upon CCCP treatment. The defects in Parkin recruitment correlate with intracellular ATP levels and can be attributed to suppression of PINK1 up-regulation in response to mitochondria depolarization. Low levels of ATP appear to prevent PINK1 translation instead of affecting PINK1 mRNA expression or reducing its stability. Consistent with a requirement of ATP for elevated PINK1 levels and Parkin mitochondrial recruitment, local or individual mitochondrial damage via photoirradiation does not affect Parkin recruitment to damaged mitochondria as long as a pool of functional mitochondria is present in the photoirradiated cells even in glucose-free or 2-deoxy-D-glucose-treated conditions. Thus, our data identify ATP as a key regulator for Parkin mitochondrial translocation and sustaining elevated PINK1 levels during mitophagy. PINK1 functions as an AND gate and a metabolic sensor coupling biogenetics of cells and stress signals to mitochondria dynamics.
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Affiliation(s)
- Schuyler Lee
- From the Department of Chemistry and Biochemistry, University of Colorado-Boulder, Boulder, Colorado 80303
| | - Conggang Zhang
- From the Department of Chemistry and Biochemistry, University of Colorado-Boulder, Boulder, Colorado 80303
| | - Xuedong Liu
- From the Department of Chemistry and Biochemistry, University of Colorado-Boulder, Boulder, Colorado 80303
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31
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Moreno KX, Satapati S, DeBerardinis RJ, Burgess SC, Malloy CR, Merritt ME. Real-time detection of hepatic gluconeogenic and glycogenolytic states using hyperpolarized [2-13C]dihydroxyacetone. J Biol Chem 2014; 289:35859-67. [PMID: 25352600 DOI: 10.1074/jbc.m114.613265] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Glycogenolysis and gluconeogenesis are sensitive to nutritional state, and the net direction of flux is controlled by multiple enzymatic steps. This delicate balance in the liver is disrupted by a variety of pathological states including cancer and diabetes mellitus. Hyperpolarized carbon-13 magnetic resonance is a new metabolic imaging technique that can probe intermediary metabolism nondestructively. There are currently no methods to rapidly distinguish livers in a gluconeogenic from glycogenolytic state. Here we use the gluconeogenic precursor dihydroxyacetone (DHA) to deliver hyperpolarized carbon-13 to the perfused mouse liver. DHA enters gluconeogenesis at the level of the trioses. Perfusion conditions were designed to establish either a gluconeogenic or a glycogenolytic state. Unexpectedly, we found that [2-(13)C]DHA was metabolized within a few seconds to the common intermediates and end products of both glycolysis and gluconeogenesis under both conditions, including [2,5-(13)C]glucose, [2-(13)C]glycerol 3-phosphate, [2-(13)C]phosphoenolpyruvate (PEP), [2-(13)C]pyruvate, [2-(13)C]alanine, and [2-(13)C]lactate. [2-(13)C]Phosphoenolpyruvate, a key branch point in gluconeogenesis and glycolysis, was monitored in functioning tissue for the first time. Observation of [2-(13)C]PEP was not anticipated as the free energy difference between PEP and pyruvate is large. Pyruvate kinase is the only regulatory step of the common glycolytic-gluconeogenic pathway that appears to exert significant control over the kinetics of any metabolites of DHA. A ratio of glycolytic to gluconeogenic products distinguished the gluconeogenic from glycogenolytic state in these functioning livers.
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Affiliation(s)
| | | | | | - Shawn C Burgess
- From the Advanced Imaging Research Center, Departments of Pharmacology and
| | - Craig R Malloy
- From the Advanced Imaging Research Center, Radiology, University of Texas - Southwestern Medical Center, Dallas, Texas 75390 and the Veterans Affairs North Texas Healthcare System, Lancaster, Texas 75216
| | - Matthew E Merritt
- From the Advanced Imaging Research Center, Radiology, University of Texas - Southwestern Medical Center, Dallas, Texas 75390 and
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32
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Abstract
Regional glucose hypometabolism is a defining feature of Alzheimer disease (AD). One emerging link between glucose hypometabolism and progression of AD is the nutrient-responsive post-translational O-GlcNAcylation of nucleocytoplasmic proteins. O-GlcNAc is abundant in neurons and occurs on both tau and amyloid precursor protein. Increased brain O-GlcNAcylation protects against tau and amyloid-β peptide toxicity. Decreased O-GlcNAcylation occurs in AD, suggesting that glucose hypometabolism may impair the protective roles of O-GlcNAc within neurons and enable neurodegeneration. Here, we review how O-GlcNAc may link cerebral glucose hypometabolism to progression of AD and summarize data regarding the protective role of O-GlcNAc in AD models.
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Affiliation(s)
- Yanping Zhu
- From the Departments of Molecular Biology and Biochemistry and Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
| | - Xiaoyang Shan
- From the Departments of Molecular Biology and Biochemistry and
| | - Scott A Yuzwa
- From the Departments of Molecular Biology and Biochemistry and
| | - David J Vocadlo
- From the Departments of Molecular Biology and Biochemistry and Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 1S6, Canada
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Abstract
After exposure to [U-(13)C3]glycerol, the liver produces primarily [1,2,3-(13)C3]- and [4,5,6-(13)C3]glucose in equal proportions through gluconeogenesis from the level of trioses. Other (13)C-labeling patterns occur as a consequence of alternative pathways for glucose production. The pentose phosphate pathway (PPP), metabolism in the citric acid cycle, incomplete equilibration by triose phosphate isomerase, or the transaldolase reaction all interact to produce complex (13)C-labeling patterns in exported glucose. Here, we investigated (13)C labeling in plasma glucose in rats given [U-(13)C3]glycerol under various nutritional conditions. Blood was drawn at multiple time points to extract glucose for NMR analysis. Because the transaldolase reaction and incomplete equilibrium by triose phosphate isomerase cannot break a (13)C-(13)C bond within the trioses contributing to glucose, the appearance of [1,2-(13)C2]-, [2,3-(13)C2]-, [5,6-(13)C2]-, and [4,5-(13)C2]glucose provides direct evidence for metabolism of glycerol in the citric acid cycle or the PPP but not an influence of either triose phosphate isomerase or the transaldolase reaction. In all animals, [1,2-(13)C2]glucose/[2,3-(13)C2]glucose was significantly greater than [5,6-(13)C2]glucose/[4,5-(13)C2]glucose, a relationship that can only arise from gluconeogenesis followed by passage of substrates through the PPP. In summary, the hepatic PPP in vivo can be detected by (13)C distribution in blood glucose after [U-(13)C3]glycerol administration.
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Affiliation(s)
- Eunsook S Jin
- From the Advanced Imaging Research Center and Departments of Internal Medicine and
| | - A Dean Sherry
- From the Advanced Imaging Research Center and Radiology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, the Department of Chemistry, University of Texas at Dallas, Richardson, Texas 75080, and
| | - Craig R Malloy
- From the Advanced Imaging Research Center and Departments of Internal Medicine and Radiology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, the Veterans Affairs North Texas Health Care System, Dallas, Texas 75216
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34
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Rodriguez-Contreras D, Hamilton N. Gluconeogenesis in Leishmania mexicana: contribution of glycerol kinase, phosphoenolpyruvate carboxykinase, and pyruvate phosphate dikinase. J Biol Chem 2014; 289:32989-3000. [PMID: 25288791 DOI: 10.1074/jbc.m114.569434] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Gluconeogenesis is an active pathway in Leishmania amastigotes and is essential for their survival within the mammalian cells. However, our knowledge about this pathway in trypanosomatids is very limited. We investigated the role of glycerol kinase (GK), phosphoenolpyruvate carboxykinase (PEPCK), and pyruvate phosphate dikinase (PPDK) in gluconeogenesis by generating the respective Leishmania mexicana Δgk, Δpepck, and Δppdk null mutants. Our results demonstrated that indeed GK, PEPCK, and PPDK are key players in the gluconeogenesis pathway in Leishmania, although stage-specific differences in their contribution to this pathway were found. GK participates in the entry of glycerol in promastigotes and amastigotes; PEPCK participates in the entry of aspartate in promastigotes, and PPDK is involved in the entry of alanine in amastigotes. Furthermore, the majority of alanine enters into the pathway via decarboxylation of pyruvate in promastigotes, whereas pathway redundancy is suggested for the entry of aspartate in amastigotes. Interestingly, we also found that l-lactate, an abundant glucogenic precursor in mammals, was used by Leishmania amastigotes to synthesize mannogen, entering the pathway through PPDK. On the basis of these new results, we propose a revision in the current model of gluconeogenesis in Leishmania, emphasizing the differences between amastigotes and promastigotes. This work underlines the importance of studying the trypanosomatid intracellular life cycle stages to gain a better understanding of the pathologies caused in humans.
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Affiliation(s)
- Dayana Rodriguez-Contreras
- From the Department of Molecular Microbiology and Immunology, Oregon Health and Science University, Portland, Oregon 97239
| | - Nicklas Hamilton
- From the Department of Molecular Microbiology and Immunology, Oregon Health and Science University, Portland, Oregon 97239
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35
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Mobasher MA, de Toro-Martín J, González-Rodríguez Á, Ramos S, Letzig LG, James LP, Muntané J, Álvarez C, Valverde ÁM. Essential role of protein-tyrosine phosphatase 1B in the modulation of insulin signaling by acetaminophen in hepatocytes. J Biol Chem 2014; 289:29406-19. [PMID: 25204659 DOI: 10.1074/jbc.m113.539189] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Many drugs are associated with the development of glucose intolerance or deterioration in glycemic control in patients with pre-existing diabetes. We have evaluated the cross-talk between signaling pathways activated by acetaminophen (APAP) and insulin signaling in hepatocytes with or without expression of the protein-tyrosine phosphatase 1B (PTP1B) and in wild-type and PTP1B-deficient mice chronically treated with APAP. Human primary hepatocytes, Huh7 hepatoma cells with silenced PTP1B, mouse hepatocytes from wild-type and PTP1B-deficient mice, and a mouse model of chronic APAP treatment were used to examine the mechanisms involving PTP1B in the effects of APAP on glucose homeostasis and hepatic insulin signaling. In APAP-treated human hepatocytes at concentrations that did not induce death, phosphorylation of JNK and PTP1B expression and enzymatic activity were increased. APAP pretreatment inhibited activation of the early steps of insulin signaling and decreased Akt phosphorylation. The effects of APAP in insulin signaling were prevented by suramin, a PTP1B inhibitor, or rosiglitazone that decreased PTP1B levels. Likewise, PTP1B deficiency in human or mouse hepatocytes protected against APAP-mediated impairment in insulin signaling. These signaling pathways were modulated in mice with chronic APAP treatment, resulting in protection against APAP-mediated hepatic insulin resistance and alterations in islet alpha/beta cell ratio in PTP1B(-/-) mice. Our results demonstrate negative cross-talk between signaling pathways triggered by APAP and insulin signaling in hepatocytes, which is in part mediated by PTP1B. Moreover, our in vivo data suggest that chronic use of APAP may be associated with insulin resistance in the liver.
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Affiliation(s)
- Maysa Ahmed Mobasher
- From the Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), 28029 Madrid, Spain, the Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Instituto de Salid Carlos III, 28029 Madrid
| | - Juan de Toro-Martín
- the Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Instituto de Salid Carlos III, 28029 Madrid, the Departamento de Bioquímica y Biología Molecular II, Facultad de Farmacia, Universidad Complutense de Madrid, 28034 Madrid, Spain
| | - Águeda González-Rodríguez
- From the Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), 28029 Madrid, Spain, the Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Instituto de Salid Carlos III, 28029 Madrid
| | - Sonia Ramos
- the Instituto de Ciencia y Tecnología de Alimentos y Nutrición (ICTAN-CSIC), 28040 Madrid, Spain
| | - Lynda G Letzig
- the Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, and
| | - Laura P James
- the Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas 72205, and
| | - Jordi Muntané
- the Department of General Surgery, Institute of Biomedicine of Seville, Hospital Universitary "Virgen del Rocío"/CSIC/University of Seville, 41013 Seville, Spain
| | - Carmen Álvarez
- the Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Instituto de Salid Carlos III, 28029 Madrid, the Departamento de Bioquímica y Biología Molecular II, Facultad de Farmacia, Universidad Complutense de Madrid, 28034 Madrid, Spain
| | - Ángela M Valverde
- From the Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), 28029 Madrid, Spain, the Centro de Investigación Biomédica en Red de Diabetes y Enfermedades Metabólicas Asociadas (CIBERDEM), Instituto de Salid Carlos III, 28029 Madrid,
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36
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Ge H, Zhang J, Gong Y, Gupte J, Ye J, Weiszmann J, Samayoa K, Coberly S, Gardner J, Wang H, Corbin T, Chui D, Baribault H, Li Y. Fibroblast growth factor receptor 4 (FGFR4) deficiency improves insulin resistance and glucose metabolism under diet-induced obesity conditions. J Biol Chem 2014; 289:30470-30480. [PMID: 25204652 DOI: 10.1074/jbc.m114.592022] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The role of fibroblast growth factor receptor 4 (FGFR4) in regulating bile acid synthesis has been well defined; however, its reported role on glucose and energy metabolism remains unresolved. Here, we show that FGFR4 deficiency in mice leads to improvement in glucose metabolism, insulin sensitivity, and reduction in body weight under high fat conditions. Mechanism of action studies in FGFR4-deficient mice suggest that the effects are mediated in part by increased plasma levels of adiponectin and the endocrine FGF factors FGF21 and FGF15, the latter of which increase in response to an elevated bile acid pool. Direct actions of increased bile acids on bile acid receptors, and other potential indirect mechanisms, may also contribute to the observed metabolic changes. The results described herein suggest that FGFR4 antagonists alone, or in combination with other agents, could serve as a novel treatment for diabetes.
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Affiliation(s)
- Hongfei Ge
- From Amgen, Inc., South San Francisco, California 94080 and
| | - Jun Zhang
- From Amgen, Inc., South San Francisco, California 94080 and
| | - Yan Gong
- From Amgen, Inc., South San Francisco, California 94080 and
| | - Jamila Gupte
- From Amgen, Inc., South San Francisco, California 94080 and
| | - Jay Ye
- From Amgen, Inc., South San Francisco, California 94080 and
| | | | - Kim Samayoa
- From Amgen, Inc., South San Francisco, California 94080 and
| | | | | | - Huilan Wang
- Amgen, Inc., Thousand Oaks, California 91320
| | - Tim Corbin
- Amgen, Inc., Thousand Oaks, California 91320
| | - Danny Chui
- Amgen, Inc., Thousand Oaks, California 91320
| | | | - Yang Li
- From Amgen, Inc., South San Francisco, California 94080 and.
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37
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Zhao Y, Ling F, Griffin TM, He T, Towner R, Ruan H, Sun XH. Up-regulation of the Sirtuin 1 (Sirt1) and peroxisome proliferator-activated receptor γ coactivator-1α (PGC-1α) genes in white adipose tissue of Id1 protein-deficient mice: implications in the protection against diet and age-induced glucose intolerance. J Biol Chem 2014; 289:29112-22. [PMID: 25190816 DOI: 10.1074/jbc.m114.571679] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Id1, a helix-loop-helix (HLH) protein that inhibits the function of basic HLH E protein transcription factors in lymphoid cells, has been implicated in diet- and age-induced obesity by unknown mechanisms. Here we show that Id1-deficient mice are resistant to a high fat diet- and age-induced obesity, as revealed by reduced weight gain and body fat, increased lipid oxidation, attenuated hepatosteatosis, lower levels of lipid droplets in brown adipose tissue, and smaller white adipocytes after a high fat diet feeding or in aged animals. Id1 deficiency improves glucose tolerance, lowers serum insulin levels, and reduces TNFα gene expression in white adipose tissue. Id1 deficiency also increased expression of Sirtuin 1 and peroxisome proliferator-activated receptor γ coactivator 1α, regulators of mitochondrial biogenesis and energy expenditure, in the white adipose tissue. This effect was accompanied by the elevation of several genes encoding proteins involved in oxidative phosphorylation and fatty acid oxidation, such as cytochrome c, medium-chain acyl-CoA dehydrogenase, and adipocyte protein 2. Moreover, the phenotype for Id1 deficiency was similar to that of mice expressing an E protein dominant-positive construct, ET2, suggesting that the balance between Id and E proteins plays a role in regulating lipid metabolism and insulin sensitivity.
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Affiliation(s)
- Ying Zhao
- From the Program in Immunobiology and Cancer Research
| | - Flora Ling
- From the Program in Immunobiology and Cancer Research, Department of Cell Biology and
| | - Timothy M Griffin
- Program in Free Radical Biology and Aging, and Department of Biochemistry and Molecular Biology, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma 73104, and
| | - Ting He
- Advanced Magnetic Resonance Center, Oklahoma Medical Research Foundation, Oklahoma City, Oklahoma 73104
| | - Rheal Towner
- Advanced Magnetic Resonance Center, Oklahoma Medical Research Foundation, Oklahoma City, Oklahoma 73104
| | - Hong Ruan
- Department of Physiology and Biophysics, Rutgers University, Piscataway, New Jersey 08854
| | - Xiao-Hong Sun
- From the Program in Immunobiology and Cancer Research, Department of Cell Biology and
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38
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Laderoute KR, Calaoagan JM, Chao WR, Dinh D, Denko N, Duellman S, Kalra J, Liu X, Papandreou I, Sambucetti L, Boros LG. 5'-AMP-activated protein kinase (AMPK) supports the growth of aggressive experimental human breast cancer tumors. J Biol Chem 2014; 289:22850-22864. [PMID: 24993821 DOI: 10.1074/jbc.m114.576371] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Rapid tumor growth can establish metabolically stressed microenvironments that activate 5'-AMP-activated protein kinase (AMPK), a ubiquitous regulator of ATP homeostasis. Previously, we investigated the importance of AMPK for the growth of experimental tumors prepared from HRAS-transformed mouse embryo fibroblasts and for primary brain tumor development in a rat model of neurocarcinogenesis. Here, we used triple-negative human breast cancer cells in which AMPK activity had been knocked down to investigate the contribution of AMPK to experimental tumor growth and core glucose metabolism. We found that AMPK supports the growth of fast-growing orthotopic tumors prepared from MDA-MB-231 and DU4475 breast cancer cells but had no effect on the proliferation or survival of these cells in culture. We used in vitro and in vivo metabolic profiling with [(13)C]glucose tracers to investigate the contribution of AMPK to core glucose metabolism in MDA-MB-231 cells, which have a Warburg metabolic phenotype; these experiments indicated that AMPK supports tumor glucose metabolism in part through positive regulation of glycolysis and the nonoxidative pentose phosphate cycle. We also found that AMPK activity in the MDA-MB-231 tumors could systemically perturb glucose homeostasis in sensitive normal tissues (liver and pancreas). Overall, our findings suggest that the contribution of AMPK to the growth of aggressive experimental tumors has a critical microenvironmental component that involves specific regulation of core glucose metabolism.
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Affiliation(s)
- Keith R Laderoute
- Biosciences Division, SRI International, Menlo Park, California 94025,.
| | - Joy M Calaoagan
- Biosciences Division, SRI International, Menlo Park, California 94025
| | - Wan-Ru Chao
- Biosciences Division, SRI International, Menlo Park, California 94025
| | - Dominc Dinh
- Biosciences Division, SRI International, Menlo Park, California 94025
| | - Nicholas Denko
- Department of Radiation Oncology, The James Comprehensive Cancer Center, Ohio State University, Columbus, Ohio 43210
| | - Sarah Duellman
- Biosciences Division, SRI International, Menlo Park, California 94025
| | - Jessica Kalra
- Department of Biology, Langara College, Vancouver, British Columbia V5W 2Z6, Canada
| | - Xiaohe Liu
- Biosciences Division, SRI International, Menlo Park, California 94025
| | - Ioanna Papandreou
- Department of Radiation Oncology, The James Comprehensive Cancer Center, Ohio State University, Columbus, Ohio 43210
| | - Lidia Sambucetti
- Biosciences Division, SRI International, Menlo Park, California 94025
| | - Laszlo G Boros
- Department of Pediatrics, UCLA School of Medicine, Los Angeles, California 90509,; Los Angeles Biomedical Research Institute at the Harbor-UCLA Medical Center, Torrance, California 90502, and; SIDMAP, LLC, Los Angeles, California 90064
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Meister J, Le Duc D, Ricken A, Burkhardt R, Thiery J, Pfannkuche H, Polte T, Grosse J, Schöneberg T, Schulz A. The G protein-coupled receptor P2Y14 influences insulin release and smooth muscle function in mice. J Biol Chem 2014; 289:23353-66. [PMID: 24993824 DOI: 10.1074/jbc.m114.580803] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
UDP sugars were identified as extracellular signaling molecules, assigning a new function to these compounds in addition to their well defined role in intracellular substrate metabolism and storage. Previously regarded as an orphan receptor, the G protein-coupled receptor P2Y14 (GPR105) was found to bind extracellular UDP and UDP sugars. Little is known about the physiological functions of this G protein-coupled receptor. To study its physiological role, we used a gene-deficient mouse strain expressing the bacterial LacZ reporter gene to monitor the physiological expression pattern of P2Y14. We found that P2Y14 is mainly expressed in pancreas and salivary glands and in subpopulations of smooth muscle cells of the gastrointestinal tract, blood vessels, lung, and uterus. Among other phenotypical differences, knock-out mice showed a significantly impaired glucose tolerance following oral and intraperitoneal glucose application. An unchanged insulin tolerance suggested altered pancreatic islet function. Transcriptome analysis of pancreatic islets showed that P2Y14 deficiency significantly changed expression of components involved in insulin secretion. Insulin secretion tests revealed a reduced insulin release from P2Y14-deficient islets, highlighting P2Y14 as a new modulator of proper insulin secretion.
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Affiliation(s)
- Jaroslawna Meister
- From the Institute of Biochemistry, Integrated Research and Treatment Center for Adiposity Diseases
| | | | | | - Ralph Burkhardt
- Institute of Laboratory Medicine, Medical Faculty, University of Leipzig, 04103 Leipzig, Germany
| | - Joachim Thiery
- Institute of Laboratory Medicine, Medical Faculty, University of Leipzig, 04103 Leipzig, Germany
| | - Helga Pfannkuche
- the Institute of Veterinary Physiology, Faculty of Veterinary Medicine, University of Leipzig, 04109 Leipzig, Germany
| | - Tobias Polte
- the Department of Environmental Immunology, UFZ-Helmholtz Centre for Environmental Research Leipzig-Halle, 04318 Leipzig, Germany, the Department of Dermatology, Venerology and Allergology, Leipzig University Medical Center, 04109 Leipzig, Germany, and
| | | | | | - Angela Schulz
- From the Institute of Biochemistry, Integrated Research and Treatment Center for Adiposity Diseases
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40
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Abstract
Alzheimer's disease (AD) is the most common form of dementia caused by neurodegenerative process and is tightly related to amyloid β (Aβ) and neurofibrillary tangles. The lack of early diagnostic biomarker and therapeutic remedy hinders the prevention of increasing population of AD patients every year. In spite of accumulated scientific information, numerous clinical trials for candidate drug targets have failed to be preceded into therapeutic development, therefore, AD-related sufferers including patients and caregivers, are desperate to seek the solution. Also, effective AD intervention is desperately needed to reduce AD-related societal threats to public health. In this review, we summarize various drug targets and strategies in recent preclinical studies and clinical trials for AD therapy: Allopathic treatment, immunotherapy, Aβ production/aggregation modulator, tau-targeting therapy and metabolic targeting. Some has already failed in their clinical trials and the others are still in various stages of investigations, both of which give us valuable information for future research in AD therapeutic development.
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Affiliation(s)
- Sun-Ho Han
- Department of Biochemistry and Biomedical Sciences, Seoul National University, College of Medicine, Seoul, Korea
| | - Inhee Mook-Jung
- Department of Biochemistry and Biomedical Sciences, Seoul National University, College of Medicine, Seoul, Korea
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41
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Kim J, Park Y, Yoon KS, Clark JM, Park Y. Permethrin alters adipogenesis in 3T3-L1 adipocytes and causes insulin resistance in C2C12 myotubes. J Biochem Mol Toxicol 2014; 28:418-24. [PMID: 24911977 DOI: 10.1002/jbt.21580] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Accepted: 05/08/2014] [Indexed: 11/08/2022]
Abstract
Pyrethroids are a class of insecticides structurally derived from the naturally occurring insecticides called pyrethrins. Along with emerging evidence that exposure to insecticides is linked to altered weight gain and glucose homeostasis, exposure to pyrethroids has been linked to altered blood glucose levels in humans. Thus, the purpose of this study was to determine the role of permethrin on lipid and glucose metabolisms. Permethrin was treated to 3T3-L1 adipocytes and C2C12 myoblasts to determine its role in lipid and glucose metabolisms, respectively. Permethrin treatment resulted in increased expression of key markers of adipogenesis and lipogenesis in adipocytes. Permethrin significantly reduced insulin-stimulated glucose uptake in myotubes. This is the first report on the role of permethrin in altered lipid metabolism in adipocytes and impaired glucose homeostasis in myotubes. These results may help elucidate fundamental underlying mechanisms between insecticide exposure, particularly permethrin, and potential risk of developing obesity and its comorbidities.
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Affiliation(s)
- Jonggun Kim
- Department of Food Science, University of Massachusetts Amherst, Amherst, MA, 01003, USA.
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42
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Deramchia K, Morand P, Biran M, Millerioux Y, Mazet M, Wargnies M, Franconi JM, Bringaud F. Contribution of pyruvate phosphate dikinase in the maintenance of the glycosomal ATP/ADP balance in the Trypanosoma brucei procyclic form. J Biol Chem 2014; 289:17365-78. [PMID: 24794874 DOI: 10.1074/jbc.m114.567230] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Trypanosoma brucei belongs to a group of protists that sequester the first six or seven glycolytic steps inside specialized peroxisomes, named glycosomes. Because of the glycosomal membrane impermeability to nucleotides, ATP molecules consumed by the first glycolytic steps need to be regenerated in the glycosomes by kinases, such as phosphoenolpyruvate carboxykinase (PEPCK). The glycosomal pyruvate phosphate dikinase (PPDK), which reversibly converts phosphoenolpyruvate into pyruvate, could also be involved in this process. To address this question, we analyzed the metabolism of the main carbon sources used by the procyclic trypanosomes (glucose, proline, and threonine) after deletion of the PPDK gene in the wild-type (Δppdk) and PEPCK null (Δppdk/Δpepck) backgrounds. The rate of acetate production from glucose is 30% reduced in the Δppdk mutant, whereas threonine-derived acetate production is not affected, showing that PPDK function in the glycolytic direction with production of ATP in the glycosomes. The Δppdk/Δpepck mutant incubated in glucose as the only carbon source showed a 3.8-fold reduction of the glycolytic rate compared with the Δpepck mutant, as a consequence of the imbalanced glycosomal ATP/ADP ratio. The role of PPDK in maintenance of the ATP/ADP balance was confirmed by expressing the glycosomal phosphoglycerate kinase (PGKC) in the Δppdk/Δpepck cell line, which restored the glycolytic flux. We also observed that expression of PGKC is lethal for procyclic trypanosomes, as a consequence of ATP depletion, due to glycosomal relocation of cytosolic ATP production. This illustrates the key roles played by glycosomal and cytosolic kinases, including PPDK, to maintain the cellular ATP/ADP homeostasis.
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Affiliation(s)
- Kamel Deramchia
- From the Centre de Résonance Magnétique des Systèmes Biologiques, Université de Bordeaux, CNRS UMR-5536, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France
| | - Pauline Morand
- From the Centre de Résonance Magnétique des Systèmes Biologiques, Université de Bordeaux, CNRS UMR-5536, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France
| | - Marc Biran
- From the Centre de Résonance Magnétique des Systèmes Biologiques, Université de Bordeaux, CNRS UMR-5536, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France
| | - Yoann Millerioux
- From the Centre de Résonance Magnétique des Systèmes Biologiques, Université de Bordeaux, CNRS UMR-5536, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France
| | - Muriel Mazet
- From the Centre de Résonance Magnétique des Systèmes Biologiques, Université de Bordeaux, CNRS UMR-5536, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France
| | - Marion Wargnies
- From the Centre de Résonance Magnétique des Systèmes Biologiques, Université de Bordeaux, CNRS UMR-5536, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France
| | - Jean-Michel Franconi
- From the Centre de Résonance Magnétique des Systèmes Biologiques, Université de Bordeaux, CNRS UMR-5536, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France
| | - Frédéric Bringaud
- From the Centre de Résonance Magnétique des Systèmes Biologiques, Université de Bordeaux, CNRS UMR-5536, 146 rue Léo Saignat, 33076 Bordeaux Cedex, France
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Kennedy BE, Madreiter CT, Vishnu N, Malli R, Graier WF, Karten B. Adaptations of energy metabolism associated with increased levels of mitochondrial cholesterol in Niemann-Pick type C1-deficient cells. J Biol Chem 2014; 289:16278-89. [PMID: 24790103 DOI: 10.1074/jbc.m114.559914] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Niemann-Pick type C1 (NPC1) is a late endosomal transmembrane protein, which, together with NPC2 in the endosome lumen, mediates the transport of endosomal cholesterol to the plasma membrane and endoplasmic reticulum. Loss of function of NPC1 or NPC2 leads to cholesterol accumulation in late endosomes and causes neuronal dysfunction and neurodegeneration. Recent studies indicate that cholesterol also accumulates in mitochondria of NPC1-deficient cells and brain tissue and that NPC1 deficiency leads to alterations in mitochondrial function and energy metabolism. Here, we have investigated the effects of increased mitochondrial cholesterol levels on energy metabolism, using RNA interference to deplete Chinese hamster ovary cells of NPC1 alone or in combination with MLN64, which mediates endosomal cholesterol transport to mitochondria. Mitochondrial cholesterol levels were also altered by depletion of NPC2 in combination with the expression of NPC2 mutants. We found that the depletion of NPC1 increased lactate secretion, decreased glutamine-dependent mitochondrial respiration, and decreased ATP transport across mitochondrial membranes. These metabolic alterations did not occur when transport of endosomal cholesterol to mitochondria was blocked. In addition, the elevated mitochondrial cholesterol levels in NPC1-depleted cells and in NPC2-depleted cells expressing mutant NPC2 that allows endosomal cholesterol trafficking to mitochondria were associated with increased expression of the antioxidant response factor Nrf2. Antioxidant treatment not only prevented the increase in Nrf2 mRNA levels but also prevented the increased lactate secretion in NPC1-depleted cells. These results suggest that mitochondrial cholesterol accumulation can increase oxidative stress and in turn cause increased glycolysis to lactate and other metabolic alterations.
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Affiliation(s)
- Barry E Kennedy
- From the Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada and
| | - Corina T Madreiter
- the Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University Graz, 8010 Graz, Austria
| | - Neelanjan Vishnu
- the Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University Graz, 8010 Graz, Austria
| | - Roland Malli
- the Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University Graz, 8010 Graz, Austria
| | - Wolfgang F Graier
- the Institute of Molecular Biology and Biochemistry, Center of Molecular Medicine, Medical University Graz, 8010 Graz, Austria
| | - Barbara Karten
- From the Department of Biochemistry and Molecular Biology, Dalhousie University, Halifax, Nova Scotia B3H 4R2, Canada and
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Cavalcanti DMLP, Castro LM, Rosa Neto JC, Seelaender M, Neves RX, Oliveira V, Forti FL, Iwai LK, Gozzo FC, Todiras M, Schadock I, Barros CC, Bader M, Ferro ES. Neurolysin knockout mice generation and initial phenotype characterization. J Biol Chem 2014; 289:15426-40. [PMID: 24719317 DOI: 10.1074/jbc.m113.539148] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The oligopeptidase neurolysin (EC 3.4.24.16; Nln) was first identified in rat brain synaptic membranes and shown to ubiquitously participate in the catabolism of bioactive peptides such as neurotensin and bradykinin. Recently, it was suggested that Nln reduction could improve insulin sensitivity. Here, we have shown that Nln KO mice have increased glucose tolerance, insulin sensitivity, and gluconeogenesis. KO mice have increased liver mRNA for several genes related to gluconeogenesis. Isotopic label semiquantitative peptidomic analysis suggests an increase in specific intracellular peptides in gastrocnemius and epididymal adipose tissue, which likely is involved with the increased glucose tolerance and insulin sensitivity in the KO mice. These results suggest the exciting new possibility that Nln is a key enzyme for energy metabolism and could be a novel therapeutic target to improve glucose uptake and insulin sensitivity.
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Affiliation(s)
| | - Leandro M Castro
- Pharmacology, Support Center for Research in Proteolysis and Cell Signaling, Biomedical Sciences Institute, University of São Paulo, São Paulo, SP 05508-900, Brazil, the Department of Biophysics, Federal University of São Paulo, São Paulo, SP 04039-032, Brazil
| | | | | | | | - Vitor Oliveira
- the Department of Biophysics, Federal University of São Paulo, São Paulo, SP 04039-032, Brazil
| | - Fábio L Forti
- the Department of Biochemistry, Support Center for Research in Proteolysis and Cell Signaling, Institute of Chemistry, University of São Paulo, São Paulo, SP 05508-000, Brazil
| | - Leo K Iwai
- the Special Laboratory of Applied Toxinology, Center of Toxins, Immune Response and Cell Signaling, Butantan Institute, São Paulo, SP 05503-000, Brazil
| | - Fabio C Gozzo
- the Institute of Chemistry, State University of Campinas, Campinas, SP 13083-862, Brazil
| | - Mihail Todiras
- the Max-Delbrück-Center for Molecular Medicine, D-13125, Berlin, Germany, and
| | - Ines Schadock
- the Max-Delbrück-Center for Molecular Medicine, D-13125, Berlin, Germany, and
| | - Carlos C Barros
- the Max-Delbrück-Center for Molecular Medicine, D-13125, Berlin, Germany, and the Department of Nutrition, Federal University of Pelotas, Pelotas, RS 96010-610, Brazil
| | - Michael Bader
- the Max-Delbrück-Center for Molecular Medicine, D-13125, Berlin, Germany, and
| | - Emer S Ferro
- Pharmacology, Support Center for Research in Proteolysis and Cell Signaling, Biomedical Sciences Institute, University of São Paulo, São Paulo, SP 05508-900, Brazil,
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45
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El-Azzouny M, Evans CR, Treutelaar MK, Kennedy RT, Burant CF. Increased glucose metabolism and glycerolipid formation by fatty acids and GPR40 receptor signaling underlies the fatty acid potentiation of insulin secretion. J Biol Chem 2014; 289:13575-88. [PMID: 24675078 DOI: 10.1074/jbc.m113.531970] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Acute fatty acid (FA) exposure potentiates glucose-stimulated insulin secretion in β cells through metabolic and receptor-mediated effects. We assessed the effect of fatty acids on the dynamics of the metabolome in INS-1 cells following exposure to [U-(13)C]glucose to assess flux through metabolic pathways. Metabolite profiling showed a fatty acid-induced increase in long chain acyl-CoAs that were rapidly esterified with glucose-derived glycerol-3-phosphate to form lysophosphatidic acid, mono- and diacylglycerols, and other glycerolipids, some implicated in augmenting insulin secretion. Glucose utilization and glycolytic flux increased, along with a reduction in the NADH/NAD(+) ratio, presumably by an increase in conversion of dihydroxyacetone phosphate to glycerol-3-phosphate. The fatty acid-induced increase in glycolysis also resulted in increases in tricarboxylic cycle flux and oxygen consumption. Inhibition of fatty acid activation of FFAR1/GPR40 by an antagonist decreased glycerolipid formation, attenuated fatty acid increases in glucose oxidation, and increased mitochondrial FA flux, as evidenced by increased acylcarnitine levels. Conversely, FFAR1/GPR40 activation in the presence of low FA increased flux into glycerolipids and enhanced glucose oxidation. These results suggest that, by remodeling glucose and lipid metabolism, fatty acid significantly increases the formation of both lipid- and TCA cycle-derived intermediates that augment insulin secretion, increasing our understanding of mechanisms underlying β cell insulin secretion.
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46
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Patterson JN, Cousteils K, Lou JW, Manning Fox JE, MacDonald PE, Joseph JW. Mitochondrial metabolism of pyruvate is essential for regulating glucose-stimulated insulin secretion. J Biol Chem 2014; 289:13335-46. [PMID: 24675076 DOI: 10.1074/jbc.m113.521666] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
It is well known that mitochondrial metabolism of pyruvate is critical for insulin secretion; however, we know little about how pyruvate is transported into mitochondria in β-cells. Part of the reason for this lack of knowledge is that the carrier gene was only discovered in 2012. In the current study, we assess the role of the recently identified carrier in the regulation of insulin secretion. Our studies show that β-cells express both mitochondrial pyruvate carriers (Mpc1 and Mpc2). Using both pharmacological inhibitors and siRNA-mediated knockdown of the MPCs we show that this carrier plays a key role in regulating insulin secretion in clonal 832/13 β-cells as well as rat and human islets. We also show that the MPC is an essential regulator of both the ATP-regulated potassium (KATP) channel-dependent and -independent pathways of insulin secretion. Inhibition of the MPC blocks the glucose-stimulated increase in two key signaling molecules involved in regulating insulin secretion, the ATP/ADP ratio and NADPH/NADP(+) ratio. The MPC also plays a role in in vivo glucose homeostasis as inhibition of MPC by the pharmacological inhibitor α-cyano-β-(1-phenylindol-3-yl)-acrylate (UK5099) resulted in impaired glucose tolerance. These studies clearly show that the newly identified mitochondrial pyruvate carrier sits at an important branching point in nutrient metabolism and that it is an essential regulator of insulin secretion.
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Affiliation(s)
- Jessica N Patterson
- From the School of Pharmacy, University of Waterloo, Waterloo, 10A Victoria Street South, Ontario N2G 1C5, Canada and
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47
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Dasgupta T, Croll DH, Owen JA, Vander Heiden MG, Locasale JW, Alon U, Cantley LC, Gunawardena J. A fundamental trade-off in covalent switching and its circumvention by enzyme bifunctionality in glucose homeostasis. J Biol Chem 2014; 289:13010-25. [PMID: 24634222 DOI: 10.1074/jbc.m113.546515] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Covalent modification provides a mechanism for modulating molecular state and regulating physiology. A cycle of competing enzymes that add and remove a single modification can act as a molecular switch between "on" and "off" and has been widely studied as a core motif in systems biology. Here, we exploit the recently developed "linear framework" for time scale separation to determine the general principles of such switches. These methods are not limited to Michaelis-Menten assumptions, and our conclusions hold for enzymes whose mechanisms may be arbitrarily complicated. We show that switching efficiency improves with increasing irreversibility of the enzymes and that the on/off transition occurs when the ratio of enzyme levels reaches a value that depends only on the rate constants. Fluctuations in enzyme levels, which habitually occur due to cellular heterogeneity, can cause flipping back and forth between on and off, leading to incoherent mosaic behavior in tissues, that worsens as switching becomes sharper. This trade-off can be circumvented if enzyme levels are correlated. In particular, if the competing catalytic domains are on the same protein but do not influence each other, the resulting bifunctional enzyme can switch sharply while remaining coherent. In the mammalian liver, the switch between glycolysis and gluconeogenesis is regulated by the bifunctional 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase (PFK-2/FBPase-2). We suggest that bifunctionality of PFK-2/FBPase-2 complements the metabolic zonation of the liver by ensuring coherent switching in response to insulin and glucagon.
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Affiliation(s)
- Tathagata Dasgupta
- From the Department of Systems Biology, Harvard Medical School, Boston, Massachusetts 02115
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48
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Bendrioua L, Smedh M, Almquist J, Cvijovic M, Jirstrand M, Goksör M, Adiels CB, Hohmann S. Yeast AMP-activated protein kinase monitors glucose concentration changes and absolute glucose levels. J Biol Chem 2014; 289:12863-75. [PMID: 24627493 DOI: 10.1074/jbc.m114.547976] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Analysis of the time-dependent behavior of a signaling system can provide insight into its dynamic properties. We employed the nucleocytoplasmic shuttling of the transcriptional repressor Mig1 as readout to characterize Snf1-Mig1 dynamics in single yeast cells. Mig1 binds to promoters of target genes and mediates glucose repression. Mig1 is predominantly located in the nucleus when glucose is abundant. Upon glucose depletion, Mig1 is phosphorylated by the yeast AMP-activated kinase Snf1 and exported into the cytoplasm. We used a three-channel microfluidic device to establish a high degree of control over the glucose concentration exposed to cells. Following regimes of glucose up- and downshifts, we observed a very rapid response reaching a new steady state within less than 1 min, different glucose threshold concentrations depending on glucose up- or downshifts, a graded profile with increased cell-to-cell variation at threshold glucose concentrations, and biphasic behavior with a transient translocation of Mig1 upon the shift from high to intermediate glucose concentrations. Fluorescence loss in photobleaching and fluorescence recovery after photobleaching data demonstrate that Mig1 shuttles constantly between the nucleus and cytoplasm, although with different rates, depending on the presence of glucose. Taken together, our data suggest that the Snf1-Mig1 system has the ability to monitor glucose concentration changes as well as absolute glucose levels. The sensitivity over a wide range of glucose levels and different glucose concentration-dependent response profiles are likely determined by the close integration of signaling with the metabolism and may provide for a highly flexible and fast adaptation to an altered nutritional status.
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Affiliation(s)
- Loubna Bendrioua
- From the Department of Chemistry and Molecular Biology, University of Gothenburg, 40530 Göteborg, Sweden
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49
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Abstract
The gut is anatomically positioned to play a critical role in the regulation of metabolic homeostasis, providing negative feedback via nutrient sensing and local hormonal signaling. Gut hormones, such as cholecystokinin (CCK) and glucagon-like peptide-1 (GLP-1), are released following a meal and act on local receptors to regulate glycemia via a neuronal gut-brain axis. Additionally, jejunal nutrient sensing and leptin action are demonstrated to suppress glucose production, and both are required for the rapid antidiabetic effect of duodenal jejunal bypass surgery. Strategies aimed at targeting local gut hormonal signaling pathways may prove to be efficacious therapeutic options to improve glucose control in diabetes.
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Affiliation(s)
- Clémence D Côté
- Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 1L7; Departments of Physiology, University of Toronto, Toronto, Ontario M5S 1A8
| | - Melika Zadeh-Tahmasebi
- Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 1L7; Departments of Physiology, University of Toronto, Toronto, Ontario M5S 1A8
| | - Brittany A Rasmussen
- Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 1L7; Departments of Physiology, University of Toronto, Toronto, Ontario M5S 1A8
| | - Frank A Duca
- Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 1L7; Departments of Medicine, University of Toronto, Toronto, Ontario M5S 1A8
| | - Tony K T Lam
- Toronto General Research Institute, University Health Network, Toronto, Ontario M5G 1L7; Departments of Physiology, University of Toronto, Toronto, Ontario M5S 1A8; Departments of Medicine, University of Toronto, Toronto, Ontario M5S 1A8; Departments of Banting and Best Diabetes Centre, University of Toronto, Toronto, Ontario M5G 2C4, Canada.
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50
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Allu PKR, Chirasani VR, Ghosh D, Mani A, Bera AK, Maji SK, Senapati S, Mullasari AS, Mahapatra NR. Naturally occurring variants of the dysglycemic peptide pancreastatin: differential potencies for multiple cellular functions and structure-function correlation. J Biol Chem 2014; 289:4455-69. [PMID: 24338022 PMCID: PMC3924307 DOI: 10.1074/jbc.m113.520916] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2013] [Revised: 12/08/2013] [Indexed: 12/16/2022] Open
Abstract
Pancreastatin (PST), a chromogranin A-derived peptide, is a potent physiological inhibitor of glucose-induced insulin secretion. PST also triggers glycogenolysis in liver and reduces glucose uptake in adipocytes and hepatocytes. Here, we probed for genetic variations in PST sequence and identified two variants within its functionally important carboxyl terminus domain: E287K and G297S. To understand functional implications of these amino acid substitutions, we tested the effects of wild-type (PST-WT), PST-287K, and PST-297S peptides on various cellular processes/events. The rank order of efficacy to inhibit insulin-stimulated glucose uptake was: PST-297S > PST-287K > PST-WT. The PST peptides also displayed the same order of efficacy for enhancing intracellular nitric oxide and Ca(2+) levels in various cell types. In addition, PST peptides activated gluconeogenic genes in the following order: PST-297S ≈ PST-287K > PST-WT. Consistent with these in vitro results, the common PST variant allele Ser-297 was associated with significantly higher (by ∼17 mg/dl, as compared with the wild-type Gly-297 allele) plasma glucose level in our study population (n = 410). Molecular modeling and molecular dynamics simulations predicted the following rank order of α-helical content: PST-297S > PST-287K > PST-WT. Corroboratively, circular dichroism analysis of PST peptides revealed significant differences in global structures (e.g. the order of propensity to form α-helix was: PST-297S ≈ PST-287K > PST-WT). This study provides a molecular basis for enhanced potencies/efficacies of human PST variants (likely to occur in ∼300 million people worldwide) and has quantitative implications for inter-individual variations in glucose/insulin homeostasis.
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Affiliation(s)
- Prasanna K. R. Allu
- From the Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai 600036
| | - Venkat R. Chirasani
- From the Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai 600036
| | - Dhiman Ghosh
- the Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Mumbai 400076, and
| | - Anitha Mani
- From the Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai 600036
| | - Amal K. Bera
- From the Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai 600036
| | - Samir K. Maji
- the Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Mumbai 400076, and
| | - Sanjib Senapati
- From the Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai 600036
| | - Ajit S. Mullasari
- the Institute of Cardiovascular Diseases, Madras Medical Mission, Chennai 600037, India
| | - Nitish R. Mahapatra
- From the Department of Biotechnology, Bhupat and Jyoti Mehta School of Biosciences, Indian Institute of Technology Madras, Chennai 600036
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