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Liu Y, Zhou Y, Ahodantin J, Jin Y, Zhu J, Sun Z, Wu X, Su L, Yang Y. Generation and characterization of mature hepatocyte organoids for liver metabolic studies. J Cell Sci 2024; 137:jcs261961. [PMID: 38700490 PMCID: PMC11166457 DOI: 10.1242/jcs.261961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Accepted: 04/12/2024] [Indexed: 05/05/2024] Open
Abstract
Hepatocyte organoids (HOs) generated in vitro are powerful tools for liver regeneration. However, previously reported HOs have mostly been fetal in nature with low expression levels of metabolic genes characteristic of adult liver functions, hampering their application in studies of metabolic regulation and therapeutic testing for liver disorders. Here, we report development of novel culture conditions that combine optimized levels of triiodothyronine (T3) with the removal of growth factors to enable successful generation of mature hepatocyte organoids (MHOs) of both mouse and human origin with metabolic functions characteristic of adult livers. We show that the MHOs can be used to study various metabolic functions including bile and urea production, zonal metabolic gene expression, and metabolic alterations in both alcoholic liver disease and non-alcoholic fatty liver disease, as well as hepatocyte proliferation, injury and cell fate changes. Notably, MHOs derived from human fetal hepatocytes also show improved hepatitis B virus infection. Therefore, these MHOs provide a powerful in vitro model for studies of human liver physiology and diseases. The human MHOs are potentially also a robust research tool for therapeutic development.
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Affiliation(s)
- Yuchen Liu
- Department of Developmental Biology, Harvard School of Dental Medicine, 188 Longwood Ave, Boston, MA 02115, USA
| | - Yaxing Zhou
- Department of Developmental Biology, Harvard School of Dental Medicine, 188 Longwood Ave, Boston, MA 02115, USA
| | - James Ahodantin
- Division of Virology, Pathogenesis, and Cancer, Institute of Human Virology, Departments of Pharmacology and Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Yu Jin
- Department of Developmental Biology, Harvard School of Dental Medicine, 188 Longwood Ave, Boston, MA 02115, USA
| | - Juanjuan Zhu
- Department of Developmental Biology, Harvard School of Dental Medicine, 188 Longwood Ave, Boston, MA 02115, USA
| | - Zhonghe Sun
- Cancer Research Technology Program, Frederick National Laboratory for Cancer, Leidos Biomedical Research, Inc., Frederick, MD 21702, USA
| | - Xiaolin Wu
- Cancer Research Technology Program, Frederick National Laboratory for Cancer, Leidos Biomedical Research, Inc., Frederick, MD 21702, USA
| | - Lishan Su
- Division of Virology, Pathogenesis, and Cancer, Institute of Human Virology, Departments of Pharmacology and Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Yingzi Yang
- Department of Developmental Biology, Harvard School of Dental Medicine, 188 Longwood Ave, Boston, MA 02115, USA
- Harvard Stem Cell Institute, Program in Gastrointestinal Malignancies, Dana-Farber/Harvard Cancer Center, 188 Longwood Ave, Boston, MA 02115, USA
- Program in Gastrointestinal Malignancies, Dana-Farber/Harvard Cancer Center, 188 Longwood Ave, Boston, MA 02115, USA
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2
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Lu H. Inflammatory liver diseases and susceptibility to sepsis. Clin Sci (Lond) 2024; 138:435-487. [PMID: 38571396 DOI: 10.1042/cs20230522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 01/09/2024] [Accepted: 03/12/2024] [Indexed: 04/05/2024]
Abstract
Patients with inflammatory liver diseases, particularly alcohol-associated liver disease and metabolic dysfunction-associated fatty liver disease (MAFLD), have higher incidence of infections and mortality rate due to sepsis. The current focus in the development of drugs for MAFLD is the resolution of non-alcoholic steatohepatitis and prevention of progression to cirrhosis. In patients with cirrhosis or alcoholic hepatitis, sepsis is a major cause of death. As the metabolic center and a key immune tissue, liver is the guardian, modifier, and target of sepsis. Septic patients with liver dysfunction have the highest mortality rate compared with other organ dysfunctions. In addition to maintaining metabolic homeostasis, the liver produces and secretes hepatokines and acute phase proteins (APPs) essential in tissue protection, immunomodulation, and coagulation. Inflammatory liver diseases cause profound metabolic disorder and impairment of energy metabolism, liver regeneration, and production/secretion of APPs and hepatokines. Herein, the author reviews the roles of (1) disorders in the metabolism of glucose, fatty acids, ketone bodies, and amino acids as well as the clearance of ammonia and lactate in the pathogenesis of inflammatory liver diseases and sepsis; (2) cytokines/chemokines in inflammatory liver diseases and sepsis; (3) APPs and hepatokines in the protection against tissue injury and infections; and (4) major nuclear receptors/signaling pathways underlying the metabolic disorders and tissue injuries as well as the major drug targets for inflammatory liver diseases and sepsis. Approaches that focus on the liver dysfunction and regeneration will not only treat inflammatory liver diseases but also prevent the development of severe infections and sepsis.
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Affiliation(s)
- Hong Lu
- Department of Pharmacology, SUNY Upstate Medical University, Syracuse, NY 13210, U.S.A
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3
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Alemany M. The Metabolic Syndrome, a Human Disease. Int J Mol Sci 2024; 25:2251. [PMID: 38396928 PMCID: PMC10888680 DOI: 10.3390/ijms25042251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 01/29/2024] [Accepted: 01/31/2024] [Indexed: 02/25/2024] Open
Abstract
This review focuses on the question of metabolic syndrome (MS) being a complex, but essentially monophyletic, galaxy of associated diseases/disorders, or just a syndrome of related but rather independent pathologies. The human nature of MS (its exceptionality in Nature and its close interdependence with human action and evolution) is presented and discussed. The text also describes the close interdependence of its components, with special emphasis on the description of their interrelations (including their syndromic development and recruitment), as well as their consequences upon energy handling and partition. The main theories on MS's origin and development are presented in relation to hepatic steatosis, type 2 diabetes, and obesity, but encompass most of the MS components described so far. The differential effects of sex and its biological consequences are considered under the light of human social needs and evolution, which are also directly related to MS epidemiology, severity, and relations with senescence. The triggering and maintenance factors of MS are discussed, with especial emphasis on inflammation, a complex process affecting different levels of organization and which is a critical element for MS development. Inflammation is also related to the operation of connective tissue (including the adipose organ) and the widely studied and acknowledged influence of diet. The role of diet composition, including the transcendence of the anaplerotic maintenance of the Krebs cycle from dietary amino acid supply (and its timing), is developed in the context of testosterone and β-estradiol control of the insulin-glycaemia hepatic core system of carbohydrate-triacylglycerol energy handling. The high probability of MS acting as a unique complex biological control system (essentially monophyletic) is presented, together with additional perspectives/considerations on the treatment of this 'very' human disease.
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Affiliation(s)
- Marià Alemany
- Faculty of Biology, Universitat de Barcelona, 08028 Barcelona, Catalonia, Spain
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4
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Wang Y, Guo D, Winkler R, Lei X, Wang X, Messina J, Luo J, Lu H. Development of novel liver-targeting glucocorticoid prodrugs. MEDICINE IN DRUG DISCOVERY 2024; 21:100172. [PMID: 38390434 PMCID: PMC10883687 DOI: 10.1016/j.medidd.2023.100172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2024] Open
Abstract
Background Glucocorticoids (GCs) are widely used in the treatment of inflammatory liver diseases and sepsis, but GC's various side effects on extrahepatic tissues limit their clinical benefits. Liver-targeting GC therapy may have multiple advantages over systemic GC therapy. The purpose of this study was to develop novel liver-targeting GC prodrugs as improved treatment for inflammatory liver diseases and sepsis. Methods A hydrophilic linker or an ultra-hydrophilic zwitterionic linker carboxylic betaine (CB) was used to bridge cholic acid (CA) and dexamethasone (DEX) to generate transporter-dependent liver-targeting GC prodrugs CA-DEX and the highly hydrophilic CA-CB-DEX. The efficacy of liver-targeting DEX prodrugs and DEX were determined in primary human hepatocytes (PHH), macrophages, human whole blood, and/or mice with sepsis induced by cecal ligation and puncture. Results CA-DEX was moderately water soluble, whereas CA-CB-DEX was highly water soluble. CA-CB-DEX and CA-DEX displayed highly transporter-dependent activities in reporter assays. Data mining found marked dysregulation of many GR-target genes important for lipid catabolism, cytoprotection, and inflammation in patients with severe alcoholic hepatitis. These key GR-target genes were similarly and rapidly (within 6 h) induced or down-regulated by CA-CB-DEX and DEX in PHH. CA-CB-DEX had much weaker inhibitory effects than DEX on endotoxin-induced cytokines in mouse macrophages and human whole blood. In contrast, CA-CB-DEX exerted more potent anti-inflammatory effects than DEX in livers of septic mice. Conclusions CA-CB-DEX demonstrated good hepatocyte-selectivity in vitro and better anti-inflammatory effects in vivo. Further test of CA-CB-DEX as a novel liver-targeting GC prodrug for inflammatory liver diseases and sepsis is warranted.
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Affiliation(s)
- Yazheng Wang
- Department of Pharmacology, SUNY Upstate Medical University, Syracuse, NY 13210, United States
| | - Dandan Guo
- Department of Pharmacology, SUNY Upstate Medical University, Syracuse, NY 13210, United States
| | - Rebecca Winkler
- Department of Pharmacology, SUNY Upstate Medical University, Syracuse, NY 13210, United States
| | - Xiaohong Lei
- Department of Pharmacology, SUNY Upstate Medical University, Syracuse, NY 13210, United States
| | - Xiaojing Wang
- Department of Pharmacology, SUNY Upstate Medical University, Syracuse, NY 13210, United States
| | - Jennifer Messina
- Department of Pharmacology, SUNY Upstate Medical University, Syracuse, NY 13210, United States
| | - Juntao Luo
- Department of Pharmacology, SUNY Upstate Medical University, Syracuse, NY 13210, United States
| | - Hong Lu
- Department of Pharmacology, SUNY Upstate Medical University, Syracuse, NY 13210, United States
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5
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Yap YW, Rusu PM, Foollee A, Rose AJ. Post-nursing early life macronutrient balance promotes persistent and malleable biometric and metabolic traits in mice. J Physiol 2023; 601:3813-3824. [PMID: 37535037 DOI: 10.1113/jp281185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 07/20/2023] [Indexed: 08/04/2023] Open
Abstract
It is known that dietary factors within the gestational and nursing period affect early life and stably affect later life traits in animals. However, there is very little understanding of whether dietary factors within the early life period from post-nursing to adulthood affect traits in adulthood. To address this, we conducted studies on male C57Bl/6J mice fed from 3 weeks (immediately post-nursing) until 12 weeks (full maturity) using nine different diets varying in all three major macronutrients to parse out the effects of individual macronutrients. Early life macronutrient balance affected body composition and glucose homeostasis in early adulthood, with dietary protein and fat showing major effects. Despite this, mice showed rapid reversal of the effects on body composition and glucose homeostasis of early life diet feeding, upon standard diet feeding in adulthood. However, some traits were persistent, with early life low dietary protein levels stably affecting lean and muscle mass, and early life dietary fat levels stably affecting serum and liver triglyceride levels. In summary, macronutrient balance in the post-nursing early life period does not stably affect adiposity or glucose homeostasis but does impact muscle mass and lipid homeostasis in adulthood, with prominent effects of both protein and fat levels. KEY POINTS: Early life dietary low protein and high fat levels lowered and heightened body mass, respectively. These effects did not substantially persist into adulthood with rapid catch-up growth on a normal diet. Early life protein (negative) and fat (positive) levels affected fat mass. Early life low protein levels negatively affected lean mass. Low protein effects on lower lean and muscle mass persisted into adulthood. Early life macronutrient balance effects did not affect later life glucose homeostasis but early life high fat level affected later life dyslipidaemia. Effects of dietary carbohydrate levels in early and later life were minor.
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Affiliation(s)
- Yann W Yap
- Nutrient Metabolism & Signalling Laboratory, Department of Biochemistry and Molecular Biology, Metabolism, Diabetes and Obesity Program, Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Patricia M Rusu
- Nutrient Metabolism & Signalling Laboratory, Department of Biochemistry and Molecular Biology, Metabolism, Diabetes and Obesity Program, Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Ashish Foollee
- Nutrient Metabolism & Signalling Laboratory, Department of Biochemistry and Molecular Biology, Metabolism, Diabetes and Obesity Program, Biomedicine Discovery Institute, Monash University, Clayton, Australia
| | - Adam J Rose
- Nutrient Metabolism & Signalling Laboratory, Department of Biochemistry and Molecular Biology, Metabolism, Diabetes and Obesity Program, Biomedicine Discovery Institute, Monash University, Clayton, Australia
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Correia CM, Præstholm SM, Havelund JF, Pedersen FB, Siersbæk MS, Ebbesen MF, Gerhart-Hines Z, Heeren J, Brewer J, Larsen S, Blagoev B, Færgeman NJ, Grøntved L. Acute Deletion of the Glucocorticoid Receptor in Hepatocytes Disrupts Postprandial Lipid Metabolism in Male Mice. Endocrinology 2023; 164:bqad128. [PMID: 37610219 DOI: 10.1210/endocr/bqad128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 07/09/2023] [Accepted: 08/21/2023] [Indexed: 08/24/2023]
Abstract
Hepatic lipid metabolism is highly dynamic, and disruption of several circadian transcriptional regulators results in hepatic steatosis. This includes genetic disruption of the glucocorticoid receptor (GR) as the liver develops. To address the functional role of GR in the adult liver, we used an acute hepatocyte-specific GR knockout model to study temporal hepatic lipid metabolism governed by GR at several preprandial and postprandial circadian timepoints. Lipidomics analysis revealed significant temporal lipid metabolism, where GR disruption results in impaired regulation of specific triglycerides, nonesterified fatty acids, and sphingolipids. This correlates with increased number and size of lipid droplets and mildly reduced mitochondrial respiration, most noticeably in the postprandial phase. Proteomics and transcriptomics analyses suggest that dysregulated lipid metabolism originates from pronounced induced expression of enzymes involved in fatty acid synthesis, β-oxidation, and sphingolipid metabolism. Integration of GR cistromic data suggests that induced gene expression is a result of regulatory actions secondary to direct GR effects on gene transcription.
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Affiliation(s)
- Catarina Mendes Correia
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense, Denmark
| | - Stine Marie Præstholm
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense, Denmark
| | - Jesper Foged Havelund
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense, Denmark
| | - Felix Boel Pedersen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense, Denmark
| | - Majken Storm Siersbæk
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense, Denmark
| | - Morten Frendø Ebbesen
- DaMBIC, Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense, Denmark
| | - Zach Gerhart-Hines
- Novo Nordisk Foundation Center for Basic Metabolic Research (CBMR), Department of Biomedical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Joerg Heeren
- Department of Biochemistry and Molecular Cell Biology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Jonathan Brewer
- DaMBIC, Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense, Denmark
| | - Steen Larsen
- Xlab, Department of Biomedical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Blagoy Blagoev
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense, Denmark
| | - Nils Joakim Færgeman
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense, Denmark
| | - Lars Grøntved
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense, Denmark
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7
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Yu Y, Liu Y, Sui X, Sui Y, Wang Z, Mendelson CR, Gao L. Arginase 1 and L-arginine coordinate fetal lung development and the initiation of labor in mice. EMBO Rep 2023; 24:e56352. [PMID: 37291976 PMCID: PMC10398669 DOI: 10.15252/embr.202256352] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 05/18/2023] [Accepted: 05/24/2023] [Indexed: 06/10/2023] Open
Abstract
Fetal development and parturition are precisely regulated processes that involve continuous crosstalk between the mother and the fetus. Our previous discovery that wild-type mice carrying steroid receptor coactivator (Src)-1 and Src-2 double-deficient fetuses exhibit impaired lung development and delayed labor, which indicates that the signals for parturition emanate from the fetus. In this study, we perform RNA sequencing and targeted metabolomics analyses of the lungs from fetal Src-1/-2 double-knockout mice and find that expression of arginase 1 (Arg1) is significantly decreased, accompanied by increased levels of the Arg1 substrate L-arginine. Knockdown of Arg1 in the lungs of fetal mice induces apoptosis of epithelial cells and dramatically delays initiation of labor. Moreover, treatment of human myometrial smooth muscle cells with L-arginine significantly inhibits spontaneous contractions by attenuating activation of NF-κB and downregulating expression of contraction-associated protein genes. Transcription factors GR and C/EBPβ increase transcription of Arg1 in an Src-1/Src-2-dependent manner. These findings provide new evidence that fetus-derived factors may play dual roles in coordinating fetal lung development and the initiation of labor.
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Affiliation(s)
- Yaqin Yu
- Department of PhysiologyNaval Medical UniversityShanghaiChina
| | - Yuanyuan Liu
- Department of PhysiologyNaval Medical UniversityShanghaiChina
| | - Xuesong Sui
- Department of PhysiologyNaval Medical UniversityShanghaiChina
| | - Yanyu Sui
- Department of PhysiologyNaval Medical UniversityShanghaiChina
| | - Zhe Wang
- Department of PhysiologyNaval Medical UniversityShanghaiChina
| | - Carole R Mendelson
- Department of BiochemistryUniversity of Texas Southwestern Medical CenterDallasTXUSA
- Department of Obstetrics and GynecologyUniversity of Texas Southwestern Medical CenterDallasTXUSA
| | - Lu Gao
- Department of PhysiologyNaval Medical UniversityShanghaiChina
- Shanghai Key Laboratory for Assisted Reproduction and Reproductive GeneticsShanghaiChina
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Abstract
A recent meta-analysis found low-carbohydrate, high-protein diets (> 3.4 g/kg of bodyweight/day) (g/kg/day) decreased men's total testosterone (∼5.23 nmol/L) [Whittaker and Harris (2022) Low-carbohydrate diets and men's cortisol and testosterone: systematic review and meta-analysis. Nutrition and Health. DOI: 10.1177/02601060221083079]. This finding has generated substantial discussion, however, it has often lacked clarity and context, with the term 'high-protein' being used unqualified. Firstly, diets < 3.4 g/kg/day are not associated with a consistent decrease in testosterone. Secondly, the average protein intake is ∼1.3 g/kg/day, conventional 'high-protein' diets are ∼1.8-3 g/kg/day and the vast majority of athletes are < 3.4 g/kg/day; meaning very few individuals will ever surpass 3.4 g/kg/day. To avoid such confusion in the future, the following definitions are proposed: very high (> 3.4 g/kg/day), high (1.9-3.4 g/kg/day), moderate (1.25-1.9 g/kg/day) and low (<1.25 g/kg/day). Using these, very high-protein diets (> 3.4 g/kg/day) appear to decrease testosterone, however high- and moderate-protein diets (1.25-3.4 g/kg/day) do not.
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Affiliation(s)
- Joseph Whittaker
- The School of Allied Health and Community, 8709University of Worcester, UK
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9
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Narrative Review: Glucocorticoids in Alcoholic Hepatitis—Benefits, Side Effects, and Mechanisms. J Xenobiot 2022; 12:266-288. [PMID: 36278756 PMCID: PMC9589945 DOI: 10.3390/jox12040019] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2022] [Revised: 09/03/2022] [Accepted: 09/05/2022] [Indexed: 11/17/2022] Open
Abstract
Alcoholic hepatitis is a major health and economic burden worldwide. Glucocorticoids (GCs) are the only first-line drugs recommended to treat severe alcoholic hepatitis (sAH), with limited short-term efficacy and significant side effects. In this review, I summarize the major benefits and side effects of GC therapy in sAH and the potential underlying mechanisms. The review of the literature and data mining clearly indicate that the hepatic signaling of glucocorticoid receptor (GR) is markedly impaired in sAH patients. The impaired GR signaling causes hepatic down-regulation of genes essential for gluconeogenesis, lipid catabolism, cytoprotection, and anti-inflammation in sAH patients. The efficacy of GCs in sAH may be compromised by GC resistance and/or GC’s extrahepatic side effects, particularly the side effects of intestinal epithelial GR on gut permeability and inflammation in AH. Prednisolone, a major GC used for sAH, activates both the GR and mineralocorticoid receptor (MR). When GC non-responsiveness occurs in sAH patients, the activation of MR by prednisolone might increase the risk of alcohol abuse, liver fibrosis, and acute kidney injury. To improve the GC therapy of sAH, the effort should be focused on developing the biomarker(s) for GC responsiveness, liver-targeting GR agonists, and strategies to overcome GC non-responsiveness and prevent alcohol relapse in sAH patients.
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10
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Weber AA, Yang X, Mennillo E, Ding J, Watrous JD, Jain M, Chen S, Karin M, Tukey RH. Lactational delivery of Triclosan promotes non-alcoholic fatty liver disease in newborn mice. Nat Commun 2022; 13:4346. [PMID: 35896521 PMCID: PMC9329322 DOI: 10.1038/s41467-022-31947-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 07/11/2022] [Indexed: 11/21/2022] Open
Abstract
Here we show that Triclosan (TCS), a high-volume antimicrobial additive that has been detected in human breastmilk, can be efficiently transferred by lactation to newborn mice, causing significant fatty liver (FL) during the suckling period. These findings are relevant since pediatric non-alcoholic fatty liver disease (NAFLD) is escalating in the United States, with a limited mechanistic understanding. Lactational delivery stimulated hepatosteatosis, triglyceride accumulation, endoplasmic reticulum (ER) stress, signs of inflammation, and liver fibrosis. De novo lipogenesis (DNL) induced by lactational TCS exposure is shown to be mediated in a PERK-eIF2α-ATF4-PPARα cascade. The administration of obeticholic acid (OCA), a potent FXR agonist, as well as activation of intestinal mucosal-regenerative gp130 signaling, led to reduced liver ATF4 expression, PPARα signaling, and DNL when neonates were exposed to TCS. It is yet to be investigated but mother to child transmission of TCS or similar toxicants may underlie the recent increases in pediatric NAFLD.
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Affiliation(s)
- André A Weber
- Laboratory of Environmental Toxicology, Department of Pharmacology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Xiaojing Yang
- Laboratory of Environmental Toxicology, Department of Pharmacology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Elvira Mennillo
- Laboratory of Environmental Toxicology, Department of Pharmacology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Jeffrey Ding
- Departments of Medicine and Pharmacology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Jeramie D Watrous
- Departments of Medicine and Pharmacology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Mohit Jain
- Departments of Medicine and Pharmacology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Shujuan Chen
- Laboratory of Environmental Toxicology, Department of Pharmacology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Michael Karin
- Laboratory of Gene Regulation and Signal Transduction, Department of Pharmacology, University of California, San Diego, La Jolla, CA, 92093, USA
| | - Robert H Tukey
- Laboratory of Environmental Toxicology, Department of Pharmacology, University of California, San Diego, La Jolla, CA, 92093, USA.
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11
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Whittaker J, Harris M. Low-carbohydrate diets and men's cortisol and testosterone: Systematic review and meta-analysis. Nutr Health 2022; 28:543-554. [PMID: 35254136 DOI: 10.1177/02601060221083079] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Background: Low-carbohydrate diets may have endocrine effects, although individual studies are conflicting. Therefore, a review was conducted on the effects of low- versus high-carbohydrate diets on men's testosterone and cortisol. Methods: The review was registered on PROSPERO (CRD42021255957). The inclusion criteria were: intervention study, healthy adult males, and low-carbohydrate diet: ≤35% carbohydrate. Eight databases were searched from conception to May 2021. Cochrane's risk of bias tool was used for quality assessment. Random-effects, meta-analyses using standardized mean differences and 95% confidence intervals, were performed with Review Manager. Subgroup analyses were conducted for diet duration, protein intake, and exercise duration. Results: Twenty-seven studies were included, with a total of 309 participants. Short-term (<3 weeks), low- versus high-carbohydrate diets moderately increased resting cortisol (0.41 [0.16, 0.66], p < 0.01). Whereas, long-term (≥3 weeks), low-carbohydrate diets had no consistent effect on resting cortisol. Low- versus high-carbohydrate diets resulted in much higher post-exercise cortisol, after long-duration exercise (≥20 min): 0 h (0.78 [0.47, 1.1], p < 0.01), 1 h (0.81 [0.31, 1.31], p < 0.01), and 2 h (0.82 [0.33, 1.3], p < 0.01). Moderate-protein (<35%), low-carbohydrate diets had no consistent effect on resting total testosterone, however high-protein (≥35%), low-carbohydrate diets greatly decreased resting (-1.08 [-1.67, -0.48], p < 0.01) and post-exercise total testosterone (-1.01 [-2, -0.01] p = 0.05). Conclusions: Resting and post-exercise cortisol increase during the first 3 weeks of a low-carbohydrate diet. Afterwards, resting cortisol appears to return to baseline, whilst post-exercise cortisol remains elevated. High-protein diets cause a large decrease in resting total testosterone (∼5.23 nmol/L).
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Affiliation(s)
- Joseph Whittaker
- The School of Allied Health and Community, 8709University of Worcester, Worcester, UK
| | - Miranda Harris
- The School of Allied Health and Community, 8709University of Worcester, Worcester, UK
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12
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Sinha S, Rosin NL, Arora R, Labit E, Jaffer A, Cao L, Farias R, Nguyen AP, de Almeida LGN, Dufour A, Bromley A, McDonald B, Gillrie MR, Fritzler MJ, Yipp BG, Biernaskie J. Dexamethasone modulates immature neutrophils and interferon programming in severe COVID-19. Nat Med 2022; 28:201-211. [PMID: 34782790 PMCID: PMC8799469 DOI: 10.1038/s41591-021-01576-3] [Citation(s) in RCA: 114] [Impact Index Per Article: 57.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Accepted: 10/12/2021] [Indexed: 12/15/2022]
Abstract
Although critical for host defense, innate immune cells are also pathologic drivers of acute respiratory distress syndrome (ARDS). Innate immune dynamics during Coronavirus Disease 2019 (COVID-19) ARDS, compared to ARDS from other respiratory pathogens, is unclear. Moreover, mechanisms underlying the beneficial effects of dexamethasone during severe COVID-19 remain elusive. Using single-cell RNA sequencing and plasma proteomics, we discovered that, compared to bacterial ARDS, COVID-19 was associated with expansion of distinct neutrophil states characterized by interferon (IFN) and prostaglandin signaling. Dexamethasone during severe COVID-19 affected circulating neutrophils, altered IFNactive neutrophils, downregulated interferon-stimulated genes and activated IL-1R2+ neutrophils. Dexamethasone also expanded immunosuppressive immature neutrophils and remodeled cellular interactions by changing neutrophils from information receivers into information providers. Male patients had higher proportions of IFNactive neutrophils and preferential steroid-induced immature neutrophil expansion, potentially affecting outcomes. Our single-cell atlas (see 'Data availability' section) defines COVID-19-enriched neutrophil states and molecular mechanisms of dexamethasone action to develop targeted immunotherapies for severe COVID-19.
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Affiliation(s)
- Sarthak Sinha
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Nicole L Rosin
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada.
| | - Rohit Arora
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Elodie Labit
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Arzina Jaffer
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Leslie Cao
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada
| | - Raquel Farias
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
- Department of Critical Care Medicine, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Angela P Nguyen
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
- Department of Critical Care Medicine, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Luiz G N de Almeida
- Department of Physiology and Pharmacology, University of Calgary, Calgary, AB, Canada
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
| | - Antoine Dufour
- Department of Physiology and Pharmacology, University of Calgary, Calgary, AB, Canada
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
| | - Amy Bromley
- Department of Pathology and Laboratory Medicine, University of Calgary, Calgary, AB, Canada
| | - Braedon McDonald
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
- Department of Critical Care Medicine, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Mark R Gillrie
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
- Department of Microbiology, Immunology and Infectious Diseases, University of Calgary, Calgary, AB, Canada
- Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Marvin J Fritzler
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
- Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Bryan G Yipp
- Calvin, Phoebe and Joan Snyder Institute for Chronic Diseases, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.
- Department of Critical Care Medicine, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.
| | - Jeff Biernaskie
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB, Canada.
- Department of Surgery, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.
- Hotchkiss Brain Institute, University of Calgary, Calgary, AB, Canada.
- Alberta Children's Hospital Research Institute, University of Calgary, Calgary, AB, Canada.
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13
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Præstholm SM, Correia CM, Goitea VE, Siersbæk MS, Jørgensen M, Havelund JF, Pedersen TÅ, Færgeman NJ, Grøntved L. Impaired glucocorticoid receptor expression in liver disrupts feeding-induced gene expression, glucose uptake, and glycogen storage. Cell Rep 2021; 37:109938. [PMID: 34731602 DOI: 10.1016/j.celrep.2021.109938] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 09/08/2021] [Accepted: 10/13/2021] [Indexed: 10/19/2022] Open
Abstract
The transition from a fasted to a fed state is associated with extensive transcriptional remodeling in hepatocytes facilitated by hormonal- and nutritional-regulated transcription factors. Here, we use a liver-specific glucocorticoid receptor (GR) knockout (L-GRKO) model to investigate the temporal hepatic expression of GR target genes in response to feeding. Interestingly, in addition to the well-described fasting-regulated genes, we identify a subset of hepatic feeding-induced genes that requires GR for full expression. This includes Gck, which is important for hepatic glucose uptake, utilization, and storage. We show that insulin and glucocorticoids cooperatively regulate hepatic Gck expression in a direct GR-dependent manner by a 4.6 kb upstream GR binding site operating as a Gck enhancer. L-GRKO blunts preprandial and early postprandial Gck expression, which ultimately affects early postprandial hepatic glucose uptake, phosphorylation, and glycogen storage. Thus, GR is positively involved in feeding-induced gene expression and important for postprandial glucose metabolism in the liver.
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Affiliation(s)
- Stine M Præstholm
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense M, Denmark
| | - Catarina M Correia
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense M, Denmark
| | - Victor E Goitea
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense M, Denmark
| | - Majken S Siersbæk
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense M, Denmark
| | - Mathilde Jørgensen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense M, Denmark
| | - Jesper F Havelund
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense M, Denmark
| | | | - Nils J Færgeman
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense M, Denmark
| | - Lars Grøntved
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense M, Denmark.
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14
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Häberle J, Moore MB, Haskins N, Rüfenacht V, Rokicki D, Rubio-Gozalbo E, Tuchman M, Longo N, Yandell M, Andrews A, AhMew N, Caldovic L. Noncoding sequence variants define a novel regulatory element in the first intron of the N-acetylglutamate synthase gene. Hum Mutat 2021; 42:1624-1636. [PMID: 34510628 DOI: 10.1002/humu.24281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 08/19/2021] [Accepted: 09/08/2021] [Indexed: 11/10/2022]
Abstract
N-acetylglutamate synthase deficiency is an autosomal recessive urea cycle disorder caused either by decreased expression of the NAGS gene or defective NAGS enzyme resulting in decreased production of N-acetylglutamate (NAG), an allosteric activator of carbamylphosphate synthetase 1 (CPS1). NAGSD is the only urea cycle disorder that can be effectively treated with a single drug, N-carbamylglutamate (NCG), a stable NAG analog, which activates CPS1 to restore ureagenesis. We describe three patients with NAGSD due to four novel noncoding sequence variants in the NAGS regulatory regions. All three patients had hyperammonemia that resolved upon treatment with NCG. Sequence variants NM_153006.2:c.427-222G>A and NM_153006.2:c.427-218A>C reside in the 547 bp-long first intron of NAGS and define a novel NAGS regulatory element that binds retinoic X receptor α. Sequence variants NC_000017.10:g.42078967A>T (NM_153006.2:c.-3065A>T) and NC_000017.10:g.42078934C>T (NM_153006.2:c.-3098C>T) reside in the NAGS enhancer, within known HNF1 and predicted glucocorticoid receptor binding sites, respectively. Reporter gene assays in HepG2 and HuH-7 cells demonstrated that all four substitutions could result in reduced expression of NAGS. These findings show that analyzing noncoding regions of NAGS and other urea cycle genes can reveal molecular causes of disease and identify novel regulators of ureagenesis.
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Affiliation(s)
- Johannes Häberle
- Division of Metabolism and Children's Research Center, University Children's Hospital, Zurich, Switzerland
| | - Marvin B Moore
- Department of Human Genetics, University of Utah Health Science Center, Salt Lake City, Utah, USA
| | - Nantaporn Haskins
- Center for Genetic Medicine Research, Children's National Hospital, Washington, District of Columbia, USA
| | - Véronique Rüfenacht
- Division of Metabolism and Children's Research Center, University Children's Hospital, Zurich, Switzerland
| | - Dariusz Rokicki
- Department of Pediatrics, Nutrition and Metabolic Diseases, The Children's Memorial Health Institute, Warsaw, Poland
| | - Estela Rubio-Gozalbo
- Department of Pediatrics and Clinical Genetics, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Mendel Tuchman
- Center for Genetic Medicine Research, Children's National Hospital, Washington, District of Columbia, USA
| | - Nicola Longo
- Division of Medical Genetics, Department of Pediatrics, University of Utah Health Science Center, Salt Lake City, Utah, USA
| | - Mark Yandell
- Eccles Institute of Human Genetics, University of Utah Health Science Center, Salt Lake City, Utah, USA.,8USTAR Center for Genetic Discovery, University of Utah Health Science Center, Salt Lake City, Utah, USA
| | - Ashley Andrews
- Division of Medical Genetics, Pediatrics, University of Utah Health Science Center, Salt Lake City, Utah, USA
| | - Nicholas AhMew
- Center for Genetic Medicine Research, Children's National Hospital, Washington, District of Columbia, USA
| | - Ljubica Caldovic
- Center for Genetic Medicine Research, Children's National Hospital, Washington, District of Columbia, USA.,Department of Genomics and Precision Medicine, School of Medical and Health Sciences, The George Washington University, Washington, District of Columbia, USA
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15
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Best Practices and Progress in Precision-Cut Liver Slice Cultures. Int J Mol Sci 2021; 22:ijms22137137. [PMID: 34281187 PMCID: PMC8267882 DOI: 10.3390/ijms22137137] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/25/2021] [Accepted: 06/30/2021] [Indexed: 12/31/2022] Open
Abstract
Thirty-five years ago, precision-cut liver slices (PCLS) were described as a promising tool and were expected to become the standard in vitro model to study liver disease as they tick off all characteristics of a good in vitro model. In contrast to most in vitro models, PCLS retain the complex 3D liver structures found in vivo, including cell–cell and cell–matrix interactions, and therefore should constitute the most reliable tool to model and to investigate pathways underlying chronic liver disease in vitro. Nevertheless, the biggest disadvantage of the model is the initiation of a procedure-induced fibrotic response. In this review, we describe the parameters and potential of PCLS cultures and discuss whether the initially described limitations and pitfalls have been overcome. We summarize the latest advances in PCLS research and critically evaluate PCLS use and progress since its invention in 1985.
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16
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Dey R, Bishayi B. Ciprofloxacin and dexamethasone in combination attenuate S. aureus induced brain abscess via neuroendocrine-immune interaction of TLR-2 and glucocorticoid receptor leading to behavioral improvement. Int Immunopharmacol 2021; 97:107695. [PMID: 33962227 DOI: 10.1016/j.intimp.2021.107695] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2021] [Revised: 04/06/2021] [Accepted: 04/18/2021] [Indexed: 12/14/2022]
Abstract
Staphylococcus aureus induced brain abscess is a critical health concern throughout the developing world. The conventional surgical intervention could not regulate the abscess-induced brain inflammation. Thus further study over the alternative therapeutic strategy for treating a brain abscess is of high priority. The resident glial cells recognize the invading S. aureus by their cell surface Toll-like receptor-2 (TLR-2). Glucocorticoid receptor (GR) was known for its immunosuppressive effects. In this study, an attempt had been taken to utilize the functional relationship or cross-talking between TLR-2 and GR during the pathogenesis of brain abscesses. Here, the combination of an antibiotic (i.e. ciprofloxacin) and dexamethasone was used to regulate the brain inflammation either in TLR-2 or GR blocking condition. We were also interested to figure out the possible impact of alternative therapy on behavioral impairments. The results indicated that combination treatment during TLR-2 blockade significantly reduced the bacterial burden and abscess area score in the infected brain. However, marked improvements were observed in anxiety, depression-like behavior, and motor co-ordination. The combination treatment after TLR-2 blocking effectively scavenged free radicals (H2O2, superoxide anion, and NO) through modulating antioxidant enzyme activities that ultimately control S. aureus induced glial reactivity possibly via up-regulating GR expression. The exogenous dexamethasone might regulate the GR expression in the brain by increasing the corticosterone concentration and the GC-GR mediated signaling. Therefore, this in-vivo study demonstrates the possible regulatory mechanism of bacterial brain abscess that involved TLR-2 and GR as a part of neuroendocrine-immune interaction.
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Affiliation(s)
- Rajen Dey
- Department of Physiology, Immunology Laboratory, University of Calcutta, University Colleges of Science and Technology, Calcutta, West Bengal, India
| | - Biswadev Bishayi
- Department of Physiology, Immunology Laboratory, University of Calcutta, University Colleges of Science and Technology, Calcutta, West Bengal, India.
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17
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Okun JG, Rusu PM, Chan AY, Wu Y, Yap YW, Sharkie T, Schumacher J, Schmidt KV, Roberts-Thomson KM, Russell RD, Zota A, Hille S, Jungmann A, Maggi L, Lee Y, Blüher M, Herzig S, Keske MA, Heikenwalder M, Müller OJ, Rose AJ. Liver alanine catabolism promotes skeletal muscle atrophy and hyperglycaemia in type 2 diabetes. Nat Metab 2021; 3:394-409. [PMID: 33758419 DOI: 10.1038/s42255-021-00369-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Accepted: 02/18/2021] [Indexed: 01/31/2023]
Abstract
Both obesity and sarcopenia are frequently associated in ageing, and together may promote the progression of related conditions such as diabetes and frailty. However, little is known about the pathophysiological mechanisms underpinning this association. Here we show that systemic alanine metabolism is linked to glycaemic control. We find that expression of alanine aminotransferases is increased in the liver in mice with obesity and diabetes, as well as in humans with type 2 diabetes. Hepatocyte-selective silencing of both alanine aminotransferase enzymes in mice with obesity and diabetes retards hyperglycaemia and reverses skeletal muscle atrophy through restoration of skeletal muscle protein synthesis. Mechanistically, liver alanine catabolism driven by chronic glucocorticoid and glucagon signalling promotes hyperglycaemia and skeletal muscle wasting. We further provide evidence for amino acid-induced metabolic cross-talk between the liver and skeletal muscle in ex vivo experiments. Taken together, we reveal a metabolic inter-tissue cross-talk that links skeletal muscle atrophy and hyperglycaemia in type 2 diabetes.
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Affiliation(s)
- Jürgen G Okun
- Division of Inherited Metabolic Diseases, University Children's Hospital, Heidelberg, Germany
| | - Patricia M Rusu
- Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Victoria, Australia
| | - Andrea Y Chan
- Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Victoria, Australia
| | - Yuqin Wu
- Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Victoria, Australia
| | - Yann W Yap
- Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Victoria, Australia
| | - Thomas Sharkie
- Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Victoria, Australia
| | - Jonas Schumacher
- Division of Molecular Metabolic Control, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Kathrin V Schmidt
- Division of Inherited Metabolic Diseases, University Children's Hospital, Heidelberg, Germany
| | - Katherine M Roberts-Thomson
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, Victoria, Australia
| | - Ryan D Russell
- Department of Health and Human Performance, College of Health Professions, University of Texas Rio Grande Valley, Brownsville, TX, USA
| | - Annika Zota
- Division of Molecular Metabolic Control, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Institute for Diabetes and Cancer (IDC), Helmholtz Center Munich, Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine I, Heidelberg University Hospital and Chair Molecular Metabolic Control, Technical University Munich, Neuherberg, Germany
| | - Susanne Hille
- Department of Internal Medicine III, University of Kiel, Kiel, Germany
- German Center for Cardiovascular Research (DZHK), Heidelberg and Kiel sites, Germany
| | - Andreas Jungmann
- German Center for Cardiovascular Research (DZHK), Heidelberg and Kiel sites, Germany
- Department of Internal Medicine III, University Hospital Heidelberg, Heidelberg, Germany
| | - Ludovico Maggi
- Division of Molecular Metabolic Control, German Cancer Research Center (DKFZ), Heidelberg, Germany
| | - Young Lee
- Touchstone Diabetes Center, Department of Internal Medicine, The University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Matthias Blüher
- Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München at the University of Leipzig, Leipzig, Germany
| | - Stephan Herzig
- Division of Molecular Metabolic Control, German Cancer Research Center (DKFZ), Heidelberg, Germany
- Institute for Diabetes and Cancer (IDC), Helmholtz Center Munich, Joint Heidelberg-IDC Translational Diabetes Program, Inner Medicine I, Heidelberg University Hospital and Chair Molecular Metabolic Control, Technical University Munich, Neuherberg, Germany
| | - Michelle A Keske
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Geelong, Victoria, Australia
| | - Mathias Heikenwalder
- Division of Chronic Inflammation and Cancer, German Cancer Research Center, Heidelberg, Germany
| | - Oliver J Müller
- Department of Internal Medicine III, University of Kiel, Kiel, Germany
- German Center for Cardiovascular Research (DZHK), Heidelberg and Kiel sites, Germany
| | - Adam J Rose
- Department of Biochemistry and Molecular Biology, Biomedicine Discovery Institute, Monash University, Melbourne, Victoria, Australia.
- Division of Molecular Metabolic Control, German Cancer Research Center (DKFZ), Heidelberg, Germany.
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18
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Wielgat P, Wawrusiewicz-Kurylonek N, Czarnomysy R, Rogowski K, Bielawski K, Car H. The Paired Siglecs in Brain Tumours Therapy: The Immunomodulatory Effect of Dexamethasone and Temozolomide in Human Glioma In Vitro Model. Int J Mol Sci 2021; 22:ijms22041791. [PMID: 33670244 PMCID: PMC7916943 DOI: 10.3390/ijms22041791] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 02/04/2021] [Accepted: 02/09/2021] [Indexed: 12/14/2022] Open
Abstract
The paired sialic acid-binding immunoglobulin like lectins (Siglecs) are characterized by similar cellular distribution and ligand recognition but opposing signalling functions attributed to different intracellular sequences. Since sialic acid—Siglec axis are known to control immune homeostasis, the imbalance between activatory and inhibitory mechanisms of glycan-dependent immune control is considered to promote pathology. The role of sialylation in cancer is described, however, its importance in immune regulation in gliomas is not fully understood. The experimental and clinical observation suggest that dexamethasone (Dex) and temozolomide (TMZ), used in the glioma management, alter the immunity within the tumour microenvironment. Using glioma-microglia/monocytes transwell co-cultures, we investigated modulatory action of Dex/TMZ on paired Siglecs. Based on real-time PCR and flow cytometry, we found changes in SIGLEC genes and their products. These effects were accompanied by altered cytokine profile and immune cells phenotype switching measured by arginases expression. Additionally, the exposure to Dex or TMZ increased the binding of inhibitory Siglec-5 and Siglec-11 fusion proteins to glioma cells. Our study suggests that the therapy-induced modulation of the interplay between sialoglycans and paired Siglecs, dependently on patient’s phenotype, is of particular signification in the immune surveillance in the glioma management and may be useful in glioma patient’s therapy plan verification.
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Affiliation(s)
- Przemyslaw Wielgat
- Department of Clinical Pharmacology, Medical University of Bialystok, Waszyngtona 15A, 15-274 Bialystok, Poland;
- Correspondence: ; Tel.: +48-85-7450-647
| | | | - Robert Czarnomysy
- Department of Synthesis and Technology of Drugs, Medical University of Bialystok, Kilińskiego 1, 15-089 Bialystok, Poland; (R.C.); (K.B.)
| | - Karol Rogowski
- Department of Experimental Pharmacology, Medical University of Bialystok, Szpitalna 37, 15-295 Bialystok, Poland;
| | - Krzysztof Bielawski
- Department of Synthesis and Technology of Drugs, Medical University of Bialystok, Kilińskiego 1, 15-089 Bialystok, Poland; (R.C.); (K.B.)
| | - Halina Car
- Department of Clinical Pharmacology, Medical University of Bialystok, Waszyngtona 15A, 15-274 Bialystok, Poland;
- Department of Experimental Pharmacology, Medical University of Bialystok, Szpitalna 37, 15-295 Bialystok, Poland;
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19
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Spiers JG, Steiger N, Khadka A, Juliani J, Hill AF, Lavidis NA, Anderson ST, Cortina Chen HJ. Repeated acute stress modulates hepatic inflammation and markers of macrophage polarisation in the rat. Biochimie 2021; 180:30-42. [PMID: 33122103 DOI: 10.1016/j.biochi.2020.10.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 09/29/2020] [Accepted: 10/24/2020] [Indexed: 12/24/2022]
Abstract
Bidirectional communication between the neuroendocrine stress and immune systems permits classically anti-inflammatory glucocorticoids to exert pro-inflammatory effects in specific cells and tissues. Liver macrophages/Kupffer cells play a crucial role in initiating inflammatory cascades mediated by the release of pro-inflammatory cytokines following tissue injury. However, the effects of repeated acute psychological stress on hepatic inflammatory phenotype and macrophage activation state remains poorly understood. We have utilised a model of repeated acute stress in rodents to observe the changes in hepatic inflammatory phenotype, including anti-inflammatory vitamin D status, in addition to examining markers of classically and alternatively-activated macrophages. Male Wistar rats were subjected to control conditions or 6 h of restraint stress applied for 1 or 3 days (n = 8 per group) after which plasma concentrations of stress hormone, enzymes associated with liver damage, and vitamin D status were examined, in addition to hepatic expression of pro- and anti-inflammatory markers. Stress increased glucocorticoids and active vitamin D levels in addition to expression of glucocorticoid alpha/beta receptor, whilst changes in circulating hepatic enzymes indicated sustained liver damage. A pro-inflammatory response was observed in liver tissues following stress, and inducible nitric oxide synthase being observed within hepatic macrophage/Kupffer cells. Together, this suggests that stress preferentially induces a pro-inflammatory response in the liver.
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Affiliation(s)
- Jereme G Spiers
- School of Biomedical Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia; Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria, 3083, Australia.
| | - Natasha Steiger
- School of Biomedical Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Arun Khadka
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria, 3083, Australia
| | - Juliani Juliani
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria, 3083, Australia
| | - Andrew F Hill
- Department of Biochemistry and Genetics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria, 3083, Australia
| | - Nickolas A Lavidis
- School of Biomedical Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Stephen T Anderson
- School of Biomedical Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia
| | - Hsiao-Jou Cortina Chen
- School of Biomedical Sciences, The University of Queensland, St Lucia, Queensland, 4072, Australia; WT-MRC Institute of Metabolic Science, University of Cambridge, Cambridge, CB2 0QQ, United Kingdom.
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20
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Remesar X, Alemany M. Dietary Energy Partition: The Central Role of Glucose. Int J Mol Sci 2020; 21:E7729. [PMID: 33086579 PMCID: PMC7593952 DOI: 10.3390/ijms21207729] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 10/15/2020] [Accepted: 10/15/2020] [Indexed: 12/17/2022] Open
Abstract
Humans have developed effective survival mechanisms under conditions of nutrient (and energy) scarcity. Nevertheless, today, most humans face a quite different situation: excess of nutrients, especially those high in amino-nitrogen and energy (largely fat). The lack of mechanisms to prevent energy overload and the effective persistence of the mechanisms hoarding key nutrients such as amino acids has resulted in deep disorders of substrate handling. There is too often a massive untreatable accumulation of body fat in the presence of severe metabolic disorders of energy utilization and disposal, which become chronic and go much beyond the most obvious problems: diabetes, circulatory, renal and nervous disorders included loosely within the metabolic syndrome. We lack basic knowledge on diet nutrient dynamics at the tissue-cell metabolism level, and this adds to widely used medical procedures lacking sufficient scientific support, with limited or nil success. In the present longitudinal analysis of the fate of dietary nutrients, we have focused on glucose as an example of a largely unknown entity. Even most studies on hyper-energetic diets or their later consequences tend to ignore the critical role of carbohydrate (and nitrogen disposal) as (probably) the two main factors affecting the substrate partition and metabolism.
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Affiliation(s)
- Xavier Remesar
- Department of Biochemistry and Molecular Biomedicine Faculty of Biology, University Barcelona, 08028 Barcelona, Spain;
- IBUB Institute of Biomedicine, University of Barcelona, 08028 Barcelona, Spain
- CIBER Obesity and Nutrition, Institute of Health Carlos III, 08028 Barcelona, Spain
| | - Marià Alemany
- Department of Biochemistry and Molecular Biomedicine Faculty of Biology, University Barcelona, 08028 Barcelona, Spain;
- IBUB Institute of Biomedicine, University of Barcelona, 08028 Barcelona, Spain
- CIBER Obesity and Nutrition, Institute of Health Carlos III, 08028 Barcelona, Spain
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21
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Præstholm SM, Correia CM, Grøntved L. Multifaceted Control of GR Signaling and Its Impact on Hepatic Transcriptional Networks and Metabolism. Front Endocrinol (Lausanne) 2020; 11:572981. [PMID: 33133019 PMCID: PMC7578419 DOI: 10.3389/fendo.2020.572981] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Accepted: 09/03/2020] [Indexed: 12/14/2022] Open
Abstract
Glucocorticoids (GCs) and the glucocorticoid receptor (GR) are important regulators of development, inflammation, stress response and metabolism, demonstrated in various diseases including Addison's disease, Cushing's syndrome and by the many side effects of prolonged clinical administration of GCs. These conditions include severe metabolic challenges in key metabolic organs like the liver. In the liver, GR is known to regulate the transcription of key enzymes in glucose and lipid metabolism and contribute to the regulation of circadian-expressed genes. Insights to the modes of GR regulation and the underlying functional mechanisms are key for understanding diseases and for the development of improved clinical uses of GCs. The activity and function of GR is regulated at numerous levels including ligand availability, interaction with heat shock protein (HSP) complexes, expression of GR isoforms and posttranslational modifications. Moreover, recent genomics studies show functional interaction with multiple transcription factors (TF) and coregulators in complex transcriptional networks controlling cell type-specific gene expression by GCs. In this review we describe the different regulatory steps important for GR activity and discuss how different TF interaction partners of GR selectively control hepatic gene transcription and metabolism.
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Affiliation(s)
| | | | - Lars Grøntved
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark
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22
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TLR-2 neutralization potentiates microglial M1 to M2 switching by the combinatorial treatment of ciprofloxacin and dexamethasone during S. aureus infection. J Neuroimmunol 2020; 344:577262. [DOI: 10.1016/j.jneuroim.2020.577262] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 04/30/2020] [Accepted: 05/04/2020] [Indexed: 12/20/2022]
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23
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Sim WC, Lee W, Sim H, Lee KY, Jung SH, Choi YJ, Kim HY, Kang KW, Lee JY, Choi YJ, Kim SK, Jun DW, Kim W, Lee BH. Downregulation of PHGDH expression and hepatic serine level contribute to the development of fatty liver disease. Metabolism 2020; 102:154000. [PMID: 31678070 DOI: 10.1016/j.metabol.2019.154000] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2019] [Revised: 10/08/2019] [Accepted: 10/19/2019] [Indexed: 01/07/2023]
Abstract
OBJECTIVE Supplementation with serine attenuates alcoholic fatty liver by regulating homocysteine metabolism and lipogenesis. However, little is known about serine metabolism in fatty liver disease (FLD). We aimed to investigate the changes in serine biosynthetic pathways in humans and animal models of fatty liver and their contribution to the development of FLD. METHODS High-fat diet (HFD)-induced steatosis and methionine-choline-deficient diet-induced steatohepatitis animal models were employed. Human serum samples were obtained from patients with FLD whose proton density fat fraction was estimated by magnetic resonance imaging. 3-Phosphoglycerate dehydrogenase (Phgdh)-knockout mouse embryonic fibroblasts (MEF) and transgenic mice overexpressing Phgdh (Tg-phgdh) were used to evaluate the role of serine metabolism in the development of FLD. RESULTS Expression of Phgdh was markedly reduced in the animal models. There were significant negative correlations of the serum serine with the liver fat fraction, serum alanine transaminase, and triglyceride levels among patients with FLD. Increased lipid accumulation and reduced NAD+ and SIRT1 activity were observed in Phgdh-knockout MEF and primary hepatocytes incubated with free fatty acids; these effects were reversed by overexpression of Phgdh. Tg-Phgdh mice showed significantly reduced hepatic triglyceride accumulation compared with wild-type littermates fed a HFD, which was accompanied by increased SIRT1 activity and reduced expression of lipogenic genes and proteins. CONCLUSIONS Human and experimental data suggest that reduced Phgdh expression and serine levels are closely associated with the development of FLD.
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Affiliation(s)
- Woo-Cheol Sim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Republic of Korea
| | - Wonseok Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Republic of Korea
| | - Hyungtai Sim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Republic of Korea
| | - Kang-Yo Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Republic of Korea
| | - Seung-Hwan Jung
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Republic of Korea
| | - You-Jin Choi
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Republic of Korea
| | - Hyun Young Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Republic of Korea
| | - Keon Wook Kang
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Republic of Korea
| | - Ji-Yoon Lee
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Young Jae Choi
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Sang Kyum Kim
- College of Pharmacy, Chungnam National University, Daejeon, Republic of Korea
| | - Dae Won Jun
- Department of Internal Medicine, Hanyang University College of Medicine, Seoul, Republic of Korea
| | - Won Kim
- Department of Internal Medicine, Seoul Metropolitan Government Seoul National University Boramae Medical Center, Seoul, Republic of Korea
| | - Byung-Hoon Lee
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, Republic of Korea.
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Zhang W, Dong Z, Xu M, Zhang S, Liu C, Chen S. SWI/SNF complex subunit BAF60a represses hepatic ureagenesis through a crosstalk between YB-1 and PGC-1α. Mol Metab 2019; 32:85-96. [PMID: 32029232 PMCID: PMC6953711 DOI: 10.1016/j.molmet.2019.12.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 12/11/2019] [Accepted: 12/13/2019] [Indexed: 01/28/2023] Open
Abstract
Objective Ureagenesis predominantly occurs in the liver and functions to remove ammonia, and the dysregulation of ureagenesis leads to the development of hyperammonemia. Recent studies have shown that ureagenesis is under the control of nutrient signals, but the mechanism remains elusive. Therefore, intensive investigation of the molecular mechanism underlying ureagenesis will shed some light on the pathology of metabolic diseases related to ammonia imbalance. Methods Mice were fasted for 24 h or fed a high-fat diet (HFD) for 16 weeks. For human evaluation, we obtained a public data set including 41 obese patients with and without hepatic steatosis. We analyzed the expression levels of hepatic BAF60a under different nutrient status. The impact of BAF60a on ureagenesis and hyperammonemia was assessed by using gain- and loss-of-function strategies. The molecular chaperons mediating the effects of BAF60a on ureagenesis were validated by molecular biological strategies. Results BAF60a was induced in the liver of both fasted and HFD-fed mice and was positively correlated with body mass index in obese patients. Liver-specific overexpression of BAF60a inhibited hepatic ureagenesis, leading to the increase of serum ammonia levels. Mechanistically, BAF60a repressed the transcription of Cps1, a rate-limiting enzyme, through interaction with Y-box protein 1 (YB-1) and by switching the chromatin structure of Cps1 promoter into an inhibitory state. More importantly, in response to different nutrient status, PGC-1α (as a transcriptional coactivator) and YB-1 competitively bound to BAF60a, thus selectively regulating hepatic fatty acid β-oxidation and ureagenesis. Conclusion The BAF60a-YB-1 axis represses hepatic ureagenesis, thereby contributing to hyperammonemia under overnutrient status. Therefore, hepatic BAF60a may be a novel therapeutic target for the treatment of overnutrient-induced urea cycle disorders and their associated diseases. HFD-feeding increases hepatic BAF60a expression, while inhibits ureagenesis genes. BAF60a represses Cps1 transcription and ureagenesis, causing ammonia accumulation. YB-1 binds to BAF60a and mediates the inhibitory effects of BAF60a on ureagenesis. BAF60a mediates crosstalk between hepatic ureagenesis and fatty acid oxidation.
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Affiliation(s)
- Wenxiang Zhang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China; School of Life Science and Technology, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China
| | - Zhewen Dong
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China; School of Life Science and Technology, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China
| | - Mengyi Xu
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China; School of Life Science and Technology, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China
| | - Shiyao Zhang
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China; School of Life Science and Technology, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China
| | - Chang Liu
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China; School of Life Science and Technology, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China; State key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, 211198, China.
| | - Siyu Chen
- State Key Laboratory of Natural Medicines, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China; School of Life Science and Technology, China Pharmaceutical University, Nanjing, Jiangsu, 211198, China; State key Laboratory of Pharmaceutical Biotechnology, Nanjing University, Nanjing, Jiangsu, 211198, China.
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Somvanshi PR, Mellon SH, Flory JD, Abu-Amara D, Wolkowitz OM, Yehuda R, Jett M, Hood L, Marmar C, Doyle FJ. Mechanistic inferences on metabolic dysfunction in posttraumatic stress disorder from an integrated model and multiomic analysis: role of glucocorticoid receptor sensitivity. Am J Physiol Endocrinol Metab 2019; 317:E879-E898. [PMID: 31322414 PMCID: PMC6879860 DOI: 10.1152/ajpendo.00065.2019] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2019] [Revised: 06/28/2019] [Accepted: 07/17/2019] [Indexed: 02/08/2023]
Abstract
Posttraumatic stress disorder (PTSD) is associated with neuroendocrine alterations and metabolic abnormalities; however, how metabolism is affected by neuroendocrine disturbances is unclear. The data from combat-exposed veterans with PTSD show increased glycolysis to lactate flux, reduced TCA cycle flux, impaired amino acid and lipid metabolism, insulin resistance, inflammation, and hypersensitive hypothalamic-pituitary-adrenal (HPA) axis. To analyze whether the co-occurrence of multiple metabolic abnormalities is independent or arises from an underlying regulatory defect, we employed a systems biological approach using an integrated mathematical model and multiomic analysis. The models for hepatic metabolism, HPA axis, inflammation, and regulatory signaling were integrated to perform metabolic control analysis (MCA) with respect to the observations from our clinical data. We combined the metabolomics, neuroendocrine, clinical laboratory, and cytokine data from combat-exposed veterans with and without PTSD to characterize the differences in regulatory effects. MCA revealed mechanistic association of the HPA axis and inflammation with metabolic dysfunction consistent with PTSD. This was supported by the data using correlational and causal analysis that revealed significant associations between cortisol suppression, high-sensitivity C-reactive protein, homeostatic model assessment of insulin resistance, γ-glutamyltransferase, hypoxanthine, and several metabolites. Causal mediation analysis indicates that the effects of enhanced glucocorticoid receptor sensitivity (GRS) on glycolytic pathway, gluconeogenic and branched-chain amino acids, triglycerides, and hepatic function are jointly mediated by inflammation, insulin resistance, oxidative stress, and energy deficit. Our analysis suggests that the interventions to normalize GRS and inflammation may help to manage features of metabolic dysfunction in PTSD.
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Affiliation(s)
- Pramod R Somvanshi
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts
| | - Synthia H Mellon
- Department of Obstetrics, Gynecology & Reproductive Sciences, University of California, San Francisco, California
| | - Janine D Flory
- Department of Psychiatry, James J. Peters Veterans Affairs Medical Center, Bronx, New York
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Duna Abu-Amara
- Department of Psychiatry, New York Langone Medical School, New York, New York
| | - Owen M Wolkowitz
- Department of Psychiatry, University of California, San Francisco, California
| | - Rachel Yehuda
- Department of Psychiatry, James J. Peters Veterans Affairs Medical Center, Bronx, New York
- Department of Psychiatry, Icahn School of Medicine at Mount Sinai, New York, New York
| | - Marti Jett
- Integrative Systems Biology, US Army Medical Research and Materiel Command, US Army Center for Environmental Health Research, Fort Detrick, Frederick, Maryland
| | - Leroy Hood
- Institute for Systems Biology, Seattle, Washington
| | - Charles Marmar
- Department of Psychiatry, New York Langone Medical School, New York, New York
| | - Francis J Doyle
- Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts
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Witte S, Brockelmann Y, Haeger JD, Schmicke M. Establishing a model of primary bovine hepatocytes with responsive growth hormone receptor expression. J Dairy Sci 2019; 102:7522-7535. [PMID: 31155243 DOI: 10.3168/jds.2018-15873] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 04/03/2019] [Indexed: 11/19/2022]
Abstract
The liver becomes resistant to growth hormone before parturition in dairy cows (uncoupling of the somatotropic axis). However, the mechanism of growth hormone insensitivity has not been fully described. The aim of the present study was to improve a previous model of adult bovine hepatocytes in a sandwich culture system to ensure growth hormone receptor (GHR) expression. First, we modified the protocol for hepatocyte retrieval and tested the effect of short (18 min) and long (up to 30 min) warm ischemia on hepatocyte viability. Second, we used medium additives that affect GHR expression in vivo-insulin (INS), dexamethasone (DEX), both (INS+DEX), or no hormone additives (CTRL)-to ensure the functionality of hepatocytes, as measured by lactate dehydrogenase activity and urea concentration in the medium. We also used reverse transcriptase PCR of hepatocytes to evaluate expression of albumin (ALB), hepatocyte nuclear factor 4α (HNF4A), nuclear factor-κ-B-inhibitor α (NFKBIA), cytosolic phosphoenolpyruvate carboxykinase (PCK1), and vimentin (VIM) mRNA. Moreover, we analyzed the expression of GHRtot (GHR), GHR1A, insulin-like growth factor-1 (IGF1), and IGF binding protein-2 (IGFBP2) in response to exposure to media with the different compositions. Modification of the protocol (changes in rinsing and perfusion times, buffer composition, and the volume and standardization of collagenase) led to increased cell counts and cell viability. Short warm ischemia with the modified protocol significantly increased cell count (4.7 × 107 ± 1.9 × 107 vs. 3.5 × 106 ± 1.5 × 106 vital cells/g of liver) and viability (79.1 ± 8.4 vs. 37.1 ± 8.9%). Therefore, we gathered hepatocytes from the liver after short warm ischemia with the modified protocol. For these hepatocytes, lactate dehydrogenase activity was lower in media with INS and with DEX than in media with INS+DEX or CTRL; urea concentrations were highest at d 4 for INS+DEX. As well, HNF4A and ALB were more highly expressed in hepatocytes cultured with INS and INS+DEX than in those cultured with DEX or CTRL, and the substitution of DEX suppressed VIM and NFKBIA expression but increased PCK1 expression. The expression of GHR, GHR1A, and IGF1 was suppressed by dexamethasone (DEX and INS+DEX), whereas INS distinctly increased GHR, GHR1A, and IGF1 mRNA expression. Hepatocytes in a sandwich culture showed influenceable GHR expression; this study provides a model that can be used in studies examining factors that influence the expression and signal transduction of GHR in dairy cows.
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Affiliation(s)
- S Witte
- Clinic for Cattle, Endocrinology Laboratory, University of Veterinary Medicine Hannover, Bischofsholer Damm 15, 30173, Germany
| | - Y Brockelmann
- Clinic for Cattle, Endocrinology Laboratory, University of Veterinary Medicine Hannover, Bischofsholer Damm 15, 30173, Germany
| | - J-D Haeger
- Institute for Anatomy, University of Veterinary Medicine Hannover, Bischofsholer Damm 15, 30173, Germany
| | - M Schmicke
- Clinic for Cattle, Endocrinology Laboratory, University of Veterinary Medicine Hannover, Bischofsholer Damm 15, 30173, Germany.
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Lam T, McLean M, Hayden A, Poljak A, Cheema B, Gurney H, Stone G, Bahl N, Reddy N, Shahidipour H, Birzniece V. A potent liver-mediated mechanism for loss of muscle mass during androgen deprivation therapy. Endocr Connect 2019; 8:605-615. [PMID: 30991356 PMCID: PMC6510709 DOI: 10.1530/ec-19-0179] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Accepted: 04/15/2019] [Indexed: 12/25/2022]
Abstract
CONTEXT Androgen deprivation therapy (ADT) in prostate cancer results in muscular atrophy, due to loss of the anabolic actions of testosterone. Recently, we discovered that testosterone acts on the hepatic urea cycle to reduce amino acid nitrogen elimination. We now hypothesize that ADT enhances protein oxidative losses by increasing hepatic urea production, resulting in muscle catabolism. We also investigated whether progressive resistance training (PRT) can offset ADT-induced changes in protein metabolism. OBJECTIVE To investigate the effect of ADT on whole-body protein metabolism and hepatic urea production with and without a home-based PRT program. DESIGN A randomized controlled trial. PATIENTS AND INTERVENTION Twenty-four prostate cancer patients were studied before and after 6 weeks of ADT. Patients were randomized into either usual care (UC) (n = 11) or PRT (n = 13) starting immediately after ADT. MAIN OUTCOME MEASURES The rate of hepatic urea production was measured by the urea turnover technique using 15N2-urea. Whole-body leucine turnover was measured, and leucine rate of appearance (LRa), an index of protein breakdown and leucine oxidation (Lox), a measure of irreversible protein loss, was calculated. RESULTS ADT resulted in a significant mean increase in hepatic urea production (from 427.6 ± 18.8 to 486.5 ± 21.3; P < 0.01) regardless of the exercise intervention. Net protein loss, as measured by Lox/Lra, increased by 12.6 ± 4.9% (P < 0.05). PRT preserved lean body mass without affecting hepatic urea production. CONCLUSION As early as 6 weeks after initiation of ADT, the suppression of testosterone increases protein loss through elevated hepatic urea production. Short-term PRT was unable to offset changes in protein metabolism during a state of profound testosterone deficiency.
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Affiliation(s)
- Teresa Lam
- School of Medicine, Western Sydney University, Penrith, New South Wales, Australia
- Department of Diabetes and Endocrinology, Blacktown Hospital, Blacktown, New South Wales, Australia
- Department of Diabetes and Endocrinology, Westmead Hospital, Westmead, New South Wales, Australia
- Correspondence should be addressed to T Lam:
| | - Mark McLean
- School of Medicine, Western Sydney University, Penrith, New South Wales, Australia
- Department of Diabetes and Endocrinology, Blacktown Hospital, Blacktown, New South Wales, Australia
| | - Amy Hayden
- Department of Radiation Oncology, Blacktown Hospital, Blacktown, New South Wales, Australia
- Crown Princess Mary Cancer Centre, Westmead Hospital, Westmead, New South Wales, Australia
| | - Anne Poljak
- Bioanalytical Mass Spectrometry Facility and School of Medical Sciences, UNSW Sydney, Sydney, New South Wales, Australia
| | - Birinder Cheema
- School of Science and Health, Western Sydney University, Penrith, New South Wales, Australia
| | - Howard Gurney
- Crown Princess Mary Cancer Centre, Westmead Hospital, Westmead, New South Wales, Australia
| | - Glenn Stone
- School of Computing, Engineering and Mathematics, Western Sydney University, Penrith, New South Wales, Australia
| | - Neha Bahl
- School of Medicine, Western Sydney University, Penrith, New South Wales, Australia
| | - Navneeta Reddy
- Department of Diabetes and Endocrinology, Blacktown Hospital, Blacktown, New South Wales, Australia
- Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia
| | - Haleh Shahidipour
- School of Medicine, Western Sydney University, Penrith, New South Wales, Australia
- Department of Diabetes and Endocrinology, Blacktown Hospital, Blacktown, New South Wales, Australia
- School of Medicine, UNSW Sydney, Sydney, New South Wales, Australia
- Translational Health Research Institute, Penrith, New South Wales, Australia
| | - Vita Birzniece
- School of Medicine, Western Sydney University, Penrith, New South Wales, Australia
- Department of Diabetes and Endocrinology, Blacktown Hospital, Blacktown, New South Wales, Australia
- Garvan Institute of Medical Research, Darlinghurst, New South Wales, Australia
- School of Medicine, UNSW Sydney, Sydney, New South Wales, Australia
- Translational Health Research Institute, Penrith, New South Wales, Australia
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28
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Diez-Fernandez C, Rüfenacht V, Gemperle C, Fingerhut R, Häberle J. Mutations and common variants in the human arginase 1 (ARG1
) gene: Impact on patients, diagnostics, and protein structure considerations. Hum Mutat 2018; 39:1029-1050. [DOI: 10.1002/humu.23545] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 04/20/2018] [Accepted: 04/25/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Carmen Diez-Fernandez
- University Children's Hospital Zurich; Division of Metabolism and Children's Research Center; Zurich Switzerland
| | - Véronique Rüfenacht
- University Children's Hospital Zurich; Division of Metabolism and Children's Research Center; Zurich Switzerland
| | - Corinne Gemperle
- University Children's Hospital Zurich; Division of Metabolism and Children's Research Center; Zurich Switzerland
| | - Ralph Fingerhut
- University Children's Hospital Zurich; Division of Metabolism and Children's Research Center; Zurich Switzerland
| | - Johannes Häberle
- University Children's Hospital Zurich; Division of Metabolism and Children's Research Center; Zurich Switzerland
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Abstract
PURPOSE OF REVIEW The purpose of this review is to summarize recent findings on hepatic actions of androgens in the regulation of protein, lipid and glucose metabolism. The rationale for liver-targeted testosterone use will be provided. RECENT FINDINGS Liver-targeted testosterone administration, via the oral route, induces protein anabolic effect by reducing the rate of protein oxidation to a similar extent to that of systemic testosterone administration. Recent evidence indicates that testosterone exerts whole-body anabolic effect through inhibition of nitrogen loss via the hepatic urea cycle. Several hepatic effects of androgens, particularly on glucose metabolism, are direct and take place before any changes in body composition occur. This includes an increase in insulin secretion and sensitivity, and reduction in hepatic glucose output by testosterone. Furthermore, lack of testosterone in the liver exacerbates diet-induced impairment in glucose metabolism. In the liver, androgens induce the full spectrum of metabolic changes through interaction with growth hormone or aromatization to estradiol. SUMMARY Liver-targeted testosterone therapy may open up a new approach to achieve whole-body anabolism without systemic side-effects. Aromatizable androgens may be superior to nonaromatizable androgens in inducing a complex spectrum of direct, estrogen-mediated and other hormone-mediated effects of androgens.
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Affiliation(s)
- Vita Birzniece
- School of Medicine, Western Sydney University, Sydney
- Department of Diabetes and Endocrinology, Blacktown Hospital, Blacktown
- Garvan Institute of Medical Research, Sydney
- School of Medicine, University of New South Wales, Sydney, New South Wales, Australia
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Dimitrov B, Himmelreich N, Hipgrave Ederveen AL, Lüchtenborg C, Okun JG, Breuer M, Hutter AM, Carl M, Guglielmi L, Hellwig A, Thiemann KC, Jost M, Peters V, Staufner C, Hoffmann GF, Hackenberg A, Paramasivam N, Wiemann S, Eils R, Schlesner M, Strahl S, Brügger B, Wuhrer M, Christoph Korenke G, Thiel C. Cutis laxa, exocrine pancreatic insufficiency and altered cellular metabolomics as additional symptoms in a new patient with ATP6AP1-CDG. Mol Genet Metab 2018; 123:364-374. [PMID: 29396028 DOI: 10.1016/j.ymgme.2018.01.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/30/2017] [Revised: 01/18/2018] [Accepted: 01/18/2018] [Indexed: 02/07/2023]
Abstract
Congenital disorders of glycosylation (CDG) are genetic defects in the glycoconjugate biosynthesis. >100 types of CDG are known, most of them cause multi-organ diseases. Here we describe a boy whose leading symptoms comprise cutis laxa, pancreatic insufficiency and hepatosplenomegaly. Whole exome sequencing identified the novel hemizygous mutation c.542T>G (p.L181R) in the X-linked ATP6AP1, an accessory protein of the mammalian vacuolar H+-ATPase, which led to a general N-glycosylation deficiency. Studies of serum N-glycans revealed reduction of complex sialylated and appearance of truncated diantennary structures. Proliferation of the patient's fibroblasts was significantly reduced and doubling time prolonged. Additionally, there were alterations in the fibroblasts' amino acid levels and the acylcarnitine composition. Especially, short-chain species were reduced, whereas several medium- to long-chain acylcarnitines (C14-OH to C18) were elevated. Investigation of the main lipid classes revealed that total cholesterol was significantly enriched in the patient's fibroblasts at the expense of phophatidylcholine and phosphatidylethanolamine. Within the minor lipid species, hexosylceramide was reduced, while its immediate precursor ceramide was increased. Since catalase activity and ACOX3 expression in peroxisomes were reduced, we assume an ATP6AP1-dependent impact on the β-oxidation of fatty acids. These results help to understand the complex clinical characteristics of this new patient.
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Affiliation(s)
- Bianca Dimitrov
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Nastassja Himmelreich
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Agnes L Hipgrave Ederveen
- Leiden University Medical Center, Center for Proteomics and Metabolomics, Albinusdreef 2, 2333 ZA Leiden, Netherlands
| | - Christian Lüchtenborg
- Heidelberg University Biochemistry Center (BZH), Im Neuenheimer Feld 328, 69120 Heidelberg, Germany
| | - Jürgen G Okun
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Maximilian Breuer
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Anna-Marlen Hutter
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Matthias Carl
- Department of Cell and Molecular Biology, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany; Laboratory of Translational Neurogenetics, Center for Integrative Biology, University of Trento, 39123 Trento, Italy
| | - Luca Guglielmi
- Department of Cell and Molecular Biology, Medical Faculty Mannheim, Heidelberg University, 68167 Mannheim, Germany; Laboratory of Translational Neurogenetics, Center for Integrative Biology, University of Trento, 39123 Trento, Italy
| | - Andrea Hellwig
- Department of Neurobiology, Interdisciplinary Center for Neurosciences, Heidelberg University, Im Neuenheimer Feld 364, 69120 Heidelberg, Germany
| | - Kai Christian Thiemann
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Markus Jost
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Verena Peters
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Christian Staufner
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Georg F Hoffmann
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany
| | - Annette Hackenberg
- Division of Pediatric Neurology, University Children's Hospital Zürich, Steinwiesstrasse 75, 8032 Zürich, Switzerland
| | - Nagarajan Paramasivam
- Medical Faculty Heidelberg, Heidelberg University, 69120 Heidelberg, Germany; Division of Theoretical Bioinformatics, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany; Bioinformatics and Omics Data Analytics (B240), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Stefan Wiemann
- Genomics & Proteomics Core Facility, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, 69120 Heidelberg, Germany; Division of Molecular Genome Analysis, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 580, 69120 Heidelberg, Germany
| | - Roland Eils
- Division of Theoretical Bioinformatics, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany; Department for Bioinformatics and Functional Genomics, Institute for Pharmacy and Molecular Biotechnology (IPMB), BioQuant, Heidelberg University, 69120 Heidelberg, Germany; Bioinformatics and Omics Data Analytics (B240), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Matthias Schlesner
- Division of Theoretical Bioinformatics, German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany; Bioinformatics and Omics Data Analytics (B240), German Cancer Research Center (DKFZ), Im Neuenheimer Feld 280, 69120 Heidelberg, Germany
| | - Sabine Strahl
- Centre for Organismal Studies (COS), Glycobiology, Heidelberg University, Im Neuenheimer Feld 360, 69120 Heidelberg, Germany
| | - Britta Brügger
- Heidelberg University Biochemistry Center (BZH), Im Neuenheimer Feld 328, 69120 Heidelberg, Germany
| | - Manfred Wuhrer
- Leiden University Medical Center, Center for Proteomics and Metabolomics, Albinusdreef 2, 2333 ZA Leiden, Netherlands
| | - G Christoph Korenke
- Klinikum Oldenburg, Zentrum für Kinder-und Jugendmedizin, Klinik für Neuropädiatrie u. angeborene Stoffwechselerkrankungen, Rahel-Straus-Straße 10, 26133 Oldenburg, Germany
| | - Christian Thiel
- Center for Child and Adolescent Medicine, Department I, Im Neuenheimer Feld 669, 69120 Heidelberg, Germany.
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Massafra V, van Mil SWC. Farnesoid X receptor: A "homeostat" for hepatic nutrient metabolism. Biochim Biophys Acta Mol Basis Dis 2017; 1864:45-59. [PMID: 28986309 DOI: 10.1016/j.bbadis.2017.10.003] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Revised: 09/27/2017] [Accepted: 10/02/2017] [Indexed: 02/06/2023]
Abstract
The Farnesoid X receptor (FXR) is a nuclear receptor activated by bile acids (BAs). BAs are amphipathic molecules that serve as fat solubilizers in the intestine under postprandial conditions. In the post-absorptive state, BAs bind FXR in the hepatocytes, which in turn provides feedback signals on BA synthesis and transport and regulates lipid, glucose and amino acid metabolism. Therefore, FXR acts as a homeostat of all three classes of nutrients, fats, sugars and proteins. Here we re-analyze the function of FXR in the perspective of nutritional metabolism, and discuss the role of FXR in liver energy homeostasis in postprandial, post-absorptive and fasting/starvation states. FXR, by regulating nutritional metabolism, represses autophagy in conditions of nutrient abundance, and controls the metabolic needs of proliferative cells. In addition, FXR regulates inflammation via direct effects and via its impact on nutrient metabolism. These functions indicate that FXR is an attractive therapeutic target for liver diseases.
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Affiliation(s)
- Vittoria Massafra
- Center for Molecular Medicine, UMC Utrecht, Utrecht, The Netherlands
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Mikiewicz M, Otrocka-Domagała I, Paździor-Czapula K, Rotkiewicz T. Influence of long-term, high-dose dexamethasone administration on proliferation and apoptosis in porcine hepatocytes. Res Vet Sci 2017; 112:141-148. [PMID: 28391056 DOI: 10.1016/j.rvsc.2017.03.018] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 03/20/2017] [Accepted: 03/29/2017] [Indexed: 10/25/2022]
Abstract
The aim of this study was to examine the influence of long-term, high-dose dexamethasone administration on the liver, with particular emphasis on hepatocyte proliferation and apoptosis, using a swine model. The study included 48 large, female Polish breed pigs aged 3months (weighing ca. 30kg) divided into groups I (control; n=24) and II (dexamethasone; n=24) that receiving intra-muscular injections of monosodium phosphate dexamethasone for 29days. The pigs were euthanized on days subsequent to the experiment. Immediately after the euthanasia, the pig livers were sampled, fixed, and processed routinely for histopathology, histochemistry, and immunohistochemistry (for proliferating cell nuclear antigen, Bcl-2, and caspase-3). Apoptosis was visualized by terminal deoxynucleotidyl transferase dUTP nick-end labelling (TUNEL). Dexamethasone administration gradually caused hepatocyte glycogen degeneration and finally lipid degeneration, accompanied by sinusoid and central vein dilatation and nuclear chromatin condensation. The proliferating cell nuclear antigen index, mean number of argyrophilic nucleolar organizer regions and proliferation index of argyrophilic nucleolar organizer regions were lower, while Bcl-2 expression was higher in group II compared with group I. The results from this study suggest that safe high-dose dexamethasone administration time is difficult to establish. Long-term, high-dose dexamethasone administration can cause pronounced morphological changes in hepatocytes by diminishing their transcriptional and proliferation activity but also protects them from apoptosis by potentially affecting Bcl-2 expression.
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Affiliation(s)
- Mateusz Mikiewicz
- Department of Pathological Anatomy, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland.
| | - Iwona Otrocka-Domagała
- Department of Pathological Anatomy, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Katarzyna Paździor-Czapula
- Department of Pathological Anatomy, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
| | - Tadeusz Rotkiewicz
- Department of Pathological Anatomy, Faculty of Veterinary Medicine, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland
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Lam T, Poljak A, McLean M, Bahl N, Ho KKY, Birzniece V. Testosterone prevents protein loss via the hepatic urea cycle in human. Eur J Endocrinol 2017; 176:489-496. [PMID: 28122810 DOI: 10.1530/eje-16-0868] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Revised: 01/05/2017] [Accepted: 01/25/2017] [Indexed: 11/08/2022]
Abstract
CONTEXT The urea cycle is a rate-limiting step for amino acid nitrogen elimination. The rate of urea synthesis is a true indicator of whole-body protein catabolism. Testosterone reduces protein and nitrogen loss. The effect of testosterone on hepatic urea synthesis in humans has not been studied. OBJECTIVE To determine whether testosterone reduces hepatic urea production. DESIGN An open-label study. PATIENTS AND INTERVENTION Eight hypogonadal men were studied at baseline, and after two weeks of transdermal testosterone replacement (Testogel, 100 mg/day). MAIN OUTCOMES MEASURES The rate of hepatic urea synthesis was measured by the urea turnover technique using stable isotope methodology, with 15N2-urea as tracer. Whole-body leucine turnover was measured, from which leucine rate of appearance (LRa), an index of protein breakdown and leucine oxidation (Lox), a measure of irreversible protein loss, were calculated. RESULTS Testosterone administration significantly reduced the rate of hepatic urea production (from 544.4 ± 71.8 to 431.7 ± 68.3 µmol/min; P < 0.01), which was paralleled by a significant reduction in serum urea concentration. Testosterone treatment significantly reduced net protein loss, as measured by percent Lox/LRa, by 19.3 ± 5.8% (P < 0.05). There was a positive association between Lox and hepatic urea production at baseline (r2 = 0.60, P < 0.05) and after testosterone administration (r2 = 0.59, P < 0.05). CONCLUSION Testosterone replacement reduces protein loss and hepatic urea synthesis. We conclude that testosterone regulates whole-body protein metabolism by suppressing the urea cycle.
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Affiliation(s)
- Teresa Lam
- School of MedicineWestern Sydney University, Penrith, New South Wales, Australia
- Department of Diabetes and EndocrinologyBlacktown Hospital, Blacktown, New South Wales, Australia
| | - Anne Poljak
- Bioanalytical Mass Spectrometry Facility and School of Medical SciencesUniversity of New South Wales, New South Wales, Australia
| | - Mark McLean
- School of MedicineWestern Sydney University, Penrith, New South Wales, Australia
- Department of Diabetes and EndocrinologyBlacktown Hospital, Blacktown, New South Wales, Australia
| | - Neha Bahl
- School of MedicineWestern Sydney University, Penrith, New South Wales, Australia
- Garvan Institute of Medical ResearchSydney, New South Wales, Australia
| | - Ken K Y Ho
- Garvan Institute of Medical ResearchSydney, New South Wales, Australia
- Centres of Health ResearchPrincess Alexandra Hospital, Brisbane, Queensland, Australia
| | - Vita Birzniece
- School of MedicineWestern Sydney University, Penrith, New South Wales, Australia
- Department of Diabetes and EndocrinologyBlacktown Hospital, Blacktown, New South Wales, Australia
- Garvan Institute of Medical ResearchSydney, New South Wales, Australia
- School of MedicineUniversity of New South Wales, New South Wales, Australia
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Mueller KM, Hartmann K, Kaltenecker D, Vettorazzi S, Bauer M, Mauser L, Amann S, Jall S, Fischer K, Esterbauer H, Müller TD, Tschöp MH, Magnes C, Haybaeck J, Scherer T, Bordag N, Tuckermann JP, Moriggl R. Adipocyte Glucocorticoid Receptor Deficiency Attenuates Aging- and HFD-Induced Obesity and Impairs the Feeding-Fasting Transition. Diabetes 2017; 66:272-286. [PMID: 27650854 DOI: 10.2337/db16-0381] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Accepted: 09/14/2016] [Indexed: 11/13/2022]
Abstract
Glucocorticoids (GCs) are important regulators of systemic energy metabolism, and aberrant GC action is linked to metabolic dysfunctions. Yet, the extent to which normal and pathophysiological energy metabolism depend on the GC receptor (GR) in adipocytes remains unclear. Here, we demonstrate that adipocyte GR deficiency in mice significantly impacts systemic metabolism in different energetic states. Plasma metabolomics and biochemical analyses revealed a marked global effect of GR deficiency on systemic metabolite abundance and, thus, substrate partitioning in fed and fasted states. This correlated with a decreased lipolytic capacity of GR-deficient adipocytes under postabsorptive and fasting conditions, resulting from impaired signal transduction from β-adrenergic receptors to adenylate cyclase. Upon prolonged fasting, the impaired lipolytic response resulted in abnormal substrate utilization and lean mass wasting. Conversely, GR deficiency attenuated aging-/diet-associated obesity, adipocyte hypertrophy, and liver steatosis. Systemic glucose tolerance was improved in obese GR-deficient mice, which was associated with increased insulin signaling in muscle and adipose tissue. We conclude that the GR in adipocytes exerts central but diverging roles in the regulation of metabolic homeostasis depending on the energetic state. The adipocyte GR is indispensable for the feeding-fasting transition but also promotes adiposity and associated metabolic disorders in fat-fed and aged mice.
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Affiliation(s)
- Kristina M Mueller
- Institute of Animal Breeding and Genetics, University of Veterinary Medicine Vienna, Vienna, Austria
- Ludwig Boltzmann Institute for Cancer Research, Vienna, Austria
| | - Kerstin Hartmann
- Institute for Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany
| | | | - Sabine Vettorazzi
- Institute for Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany
| | - Mandy Bauer
- Institute for Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany
| | - Lea Mauser
- Institute for Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany
| | - Sabine Amann
- Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Sigrid Jall
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH) and German Center for Diabetes Research (DZD), Neuherberg, Germany
- Division of Metabolic Diseases, Department of Medicine, Technische Universität München, Munich, Germany
| | - Katrin Fischer
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH) and German Center for Diabetes Research (DZD), Neuherberg, Germany
- Division of Metabolic Diseases, Department of Medicine, Technische Universität München, Munich, Germany
| | - Harald Esterbauer
- Department of Laboratory Medicine, Medical University of Vienna, Vienna, Austria
| | - Timo D Müller
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH) and German Center for Diabetes Research (DZD), Neuherberg, Germany
- Division of Metabolic Diseases, Department of Medicine, Technische Universität München, Munich, Germany
| | - Matthias H Tschöp
- Institute for Diabetes and Obesity, Helmholtz Diabetes Center, Helmholtz Zentrum München, German Research Center for Environmental Health (GmbH) and German Center for Diabetes Research (DZD), Neuherberg, Germany
- Division of Metabolic Diseases, Department of Medicine, Technische Universität München, Munich, Germany
| | - Christoph Magnes
- HEALTH Institute for Biomedicine and Health Sciences, JOANNEUM RESEARCH, Forschungsgesellschaft mbH, Graz, Austria
| | | | - Thomas Scherer
- Division of Endocrinology and Metabolism, Department of Medicine III, Medical University of Vienna, Vienna, Austria
| | - Natalie Bordag
- Center for Biomarker Research in Medicine, CBmed GmbH, Graz, Austria
| | - Jan P Tuckermann
- Institute for Comparative Molecular Endocrinology, University of Ulm, Ulm, Germany
| | - Richard Moriggl
- Institute of Animal Breeding and Genetics, University of Veterinary Medicine Vienna, Vienna, Austria
- Ludwig Boltzmann Institute for Cancer Research, Vienna, Austria
- Medical University of Vienna, Vienna, Austria
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