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Tessmann JW, Deng P, Durham J, Li C, Banerjee M, Wang Q, Goettl RA, He D, Wang C, Lee EY, Evers BM, Hennig B, Zaytseva YY. Perfluorooctanesulfonic acid exposure leads to downregulation of 3-hydroxy-3-methylglutaryl-CoA synthase 2 expression and upregulation of markers associated with intestinal carcinogenesis in mouse intestinal tissues. Chemosphere 2024; 359:142332. [PMID: 38754493 DOI: 10.1016/j.chemosphere.2024.142332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 05/06/2024] [Accepted: 05/12/2024] [Indexed: 05/18/2024]
Abstract
Perfluorooctanesulfonic acid (PFOS) is a widely recognized environment pollutant known for its high bioaccumulation potential and a long elimination half-life. Several studies have shown that PFOS can alter multiple biological pathways and negatively affect human health. Considering the direct exposure to the gastrointestinal (GI) tract to environmental pollutants, PFOS can potentially disrupt intestinal homeostasis. However, there is limited knowledge about the effect of PFOS exposure on normal intestinal tissues, and its contribution to GI-associated diseases remains to be determined. In this study, we examined the effect of PFOS exposure on the gene expression profile of intestinal tissues of C57BL/6 mice using RNAseq analysis. We found that PFOS exposure in drinking water significantly downregulates mitochondrial 3-hydroxy-3-methylglutaryl-CoA synthase 2 (HMGCS2), a rate-limiting ketogenic enzyme, in intestinal tissues of mice. We found that diets containing the soluble fibers inulin and pectin, which are known to be protective against PFOS exposure, were ineffective in reversing the downregulation of HMGCS2 expression in vivo. Analysis of intestinal tissues also demonstrated that PFOS exposure leads to upregulation of proteins implicated in colorectal carcinogenesis, including β-catenin, c-MYC, mTOR and FASN. Consistent with the in vivo results, PFOS exposure leads to downregulation of HMGCS2 in mouse and human normal intestinal organoids in vitro. Furthermore, we show that shRNA-mediated knockdown of HMGCS2 in a human normal intestinal cell line resulted in increased cell proliferation and upregulation of key proliferation-associated proteins such as cyclin D, survivin, ERK1/2 and AKT, along with an increase in lipid accumulation. In summary, our results suggest that PFOS exposure may contribute to pathological changes in normal intestinal cells via downregulation of HMGCS2 expression and upregulation of pro-carcinogenic signaling pathways that may increase the risk of colorectal cancer development.
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Affiliation(s)
- Josiane Weber Tessmann
- Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY 40536, USA.
| | - Pan Deng
- College of Pharmaceutical Sciences, Soochow University, Suzhou, China.
| | - Jerika Durham
- Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY 40536, USA.
| | - Chang Li
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA.
| | - Moumita Banerjee
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA.
| | - Qingding Wang
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA.
| | - Ryan A Goettl
- Markey Cancer Center Biostatistics and Bioinformatics Shared Resource Facility, University of Kentucky, Lexington, KY 40536, USA.
| | - Daheng He
- Markey Cancer Center Biostatistics and Bioinformatics Shared Resource Facility, University of Kentucky, Lexington, KY 40536, USA.
| | - Chi Wang
- Markey Cancer Center Biostatistics and Bioinformatics Shared Resource Facility, University of Kentucky, Lexington, KY 40536, USA.
| | - Eun Y Lee
- Department of Pathology and Laboratory Medicine, University of Kentucky, Lexington, KY 40536, USA.
| | - B Mark Evers
- Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA.
| | - Bernhard Hennig
- Department of Animal and Food Sciences, University of Kentucky, Lexington, KY 40536, USA.
| | - Yekaterina Y Zaytseva
- Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, KY 40536, USA; Markey Cancer Center, University of Kentucky, Lexington, KY 40536, USA.
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Daniels M, Margolis LM, Rood JC, Lieberman HR, Pasiakos SM, Karl JP. Comparative Analysis of Circulating Metabolomic Profiles Identifies Shared Metabolic Alterations Across Distinct Multi-Stressor Military Training Operations. Physiol Genomics 2024. [PMID: 38738316 DOI: 10.1152/physiolgenomics.00008.2024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Accepted: 05/03/2024] [Indexed: 05/14/2024] Open
Abstract
Military training provides insight into metabolic responses under unique physiological demands that can be comprehensively characterized by global metabolomic profiling to identify potential strategies for improving performance. This study identified shared changes in metabolomic profiles across three distinct military training exercises varying in magnitude and types of stress. Blood samples collected before and after three real or simulated military training exercises were analyzed using the same untargeted metabolomic profiling platform. Exercises included a three-week survival school course (ST, n=36), a four-day arctic cross country ski march (AT, n=24), and a 28-day controlled diet- and exercise-induced energy deficit (CED, n=26). Log2-fold changes of >±1 in 191, 121 and 64 metabolites were identified in the ST, AT and CED datasets, respectively. Most metabolite changes were within lipid (57-63%) and amino acid metabolism (18-19%) pathways, and changes in 87 were shared across studies. The largest and most consistent increases in shared metabolites were found in acylcarnitine, fatty acid, ketone, and glutathione metabolism pathways, whereas the largest decreases were in diacylglycerol and urea cycle metabolism pathways. Multiple shared metabolites were consistently correlated with biomarkers of inflammation, tissue damage, and anabolic hormones across studies. These three studies of real and simulated military training revealed overlapping alterations in metabolomic profiles despite differences in environment and the stressors involved. Consistent changes in metabolites related to lipid metabolism, ketogenesis and oxidative stress suggest a potential common metabolomic signature associated with inflammation, tissue damage and suppression of anabolic signaling that may characterize unique physiological demands of military training.
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Affiliation(s)
- Michael Daniels
- Military Nutrition Division, US Army Research Institute of Environmental Medicine, Natick, MA, United States
| | | | - Jennifer C Rood
- Pennington Biomedical Research Center, Louisiana State University, Baton Rouge, LA, United States
| | - Harris R Lieberman
- Military Nutrition Division, US Army Research Institute of Environmental Medicine, Natick, MA, United States
| | | | - J Philip Karl
- Military Nutrition Division, US Army Research Institute of Environmental Medicine, Natick, MA, United States
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Ünal İ, Cansız D, Beler M, Sezer Z, Güzel E, Emekli-Alturfan E. Sodium-dependent glucose co-transporter-2 inhibitor empagliflozin exerts neuroprotective effects in rotenone-induced Parkinson's disease model in zebrafish; mechanism involving ketogenesis and autophagy. Brain Res 2023; 1820:148536. [PMID: 37591458 DOI: 10.1016/j.brainres.2023.148536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Revised: 06/26/2023] [Accepted: 08/14/2023] [Indexed: 08/19/2023]
Abstract
Sodium-dependent glucose co-transporter-2 (SGLT2) inhibitor empagliflozin (EMP), is the new class of oral hypoglycemic agent approved as a treatment for Type 2 diabetes. SGLT2 inhibitors may induce ketogenesis through inhibiting the renal reabsorption of glucose. In recent years, positive effects of ketogenic diets on neurodegenerative diseases such as Parkinson's disease (PD) have been reported by improving autophagy. We aimed to evaluate the effects of EMP treatment as a SGLT2 inhibitor that can mimic the effects of ketogenic diet, in rotenone induced PD model in zebrafish focusing on ketogenesis, autophagy, and molecular pathways related with PD progression including oxidative stress and inflammation. Adult zebrafish were exposed to rotenone and EMP for 30 days. Y-Maze task and locomotor analysis were performed. Neurotransmitter levels were determined by liquid chromatography tandem- mass spectrometry (LC-MS/MS). Lipid peroxidation (LPO), nitric oxide (No), alkaline phosphatase, superoxide dismutase, glutathione, glutathione S-transferase (GST), sialic acid, acetylcholinesterase, and the expressions of autophagy, ketogenesis and PD-related genes were determined. Immunohistochemical staining was performed for the microglial marker L-plastin (Lcp1) and tyrosine hydroxylase (Th). EMP treatment improved DOPAC/DA ratio, Y-Maze task, locomotor activity, expressions of Th and Lcp-1, autophagy and inflammation related (mTor, atg5, tnfα, sirt1, il6, tnfα); PD-related (lrrk2, park2, park7, pink1), and ketone metabolism-related genes (slc16a1b, pparag, and pparab), and oxidant-damage in brain in the rotenone group as evidenced by decreased LPO, No, and improved antioxidant molecules. Our results showed benefical effects of EMP as a SGLT2 inhibitor in neurotoxin-induced PD model in zebrafish. We believe our study, will shed light on the mechanism of the effects of SGLT2 inhibitors, ketogenesis and autopahgy in PD.
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Affiliation(s)
- İsmail Ünal
- Marmara University, Institute of Health Sciences, Faculty of Pharmacy, Department of Biochemistry, Istanbul, Turkey
| | - Derya Cansız
- Department Medipol University, Faculty of Medicine, Medical Biochemistry, Istanbul, Turkey
| | - Merih Beler
- Marmara University, Institute of Health Sciences, Faculty of Pharmacy, Department of Biochemistry, Istanbul, Turkey
| | - Zehra Sezer
- Department of Histology and Embryology, Istanbul University-Cerrahpasa, Cerrahpasa Faculty of Medicine, Istanbul 34098, Turkey
| | - Elif Güzel
- Department of Histology and Embryology, Istanbul University-Cerrahpasa, Cerrahpasa Faculty of Medicine, Istanbul 34098, Turkey
| | - Ebru Emekli-Alturfan
- Marmara University, Faculty of Dentistry, Department of Basic Medical Sciences, Istanbul, Turkey.
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Zayed M, Sastriques-Dunlop S, Elizondo-Benedetto S, Arif B, Meade R, Zaghloul M, Luehmann H, Heo G, English S, Liu Y. Ketosis Prevents Abdominal Aortic Aneurysm Rupture Through C-C Chemokine Receptor Type 2 Downregulation and Enhanced MMP Balance. Res Sq 2023:rs.3.rs-3054767. [PMID: 37461581 PMCID: PMC10350122 DOI: 10.21203/rs.3.rs-3054767/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/24/2023]
Abstract
Abdominal aortic aneurysms (AAAs) are prevelant with aging, and AAA rupture is associated with high mortality. There is currently no effective medical therapy for AAA rupture. Previous work demonstrated that the monocyte chemoattractant protein (MCP-1) / C-C chemokine receptor type 2 (CCR2) axis critically regulates AAA inflammation, matrix-metalloproteinase (MMP) production, and extracellular matrix (ECM) stability. Here we similarly observed that Ccr2-/- mice have significantly reduced AAA expansion and rupture. We therefore hypothesized that a dietary modulation of the CCR2 axis may therapeutically impact AAA risk of rupture. Since ketone bodies (KBs) can trigger repair mechanisms in response to inflammation, we specifically evaluated whether systemic ketosis in vivo can reduce CCR2 and AAA progression. Male Sprague-Dawley rats underwent surgical AAA formation using porcine pancreatic elastase (PPE), and received daily β-aminopropionitrile (BAPN) to promote AAA rupture. Animals with AAAs received either a standard diet (SD), ketogenic diet (KD), or exogenous KBs (EKB). Animals recieving KD and EKB reached a state of ketosis, and had significant reduction in AAA expansion and incidence of rupture. Ketosis also led to significantly reduced aortic CCR2 content, improved MMP balance, and reduced ECM degradation. In summary, this study demonstrates that ketosis plays a crucial role in AAA pathobiology, and provides the impetus for future clinical studies investigating the potential benefit of ketosis for prevention of AAA expansion and rupture.
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Affiliation(s)
- Mohamed Zayed
- Washington University in St. Louis School of Medicine
| | | | | | - Batool Arif
- Washington University in St. Louis School of Medicine
| | - Rodrigo Meade
- Washington University in St. Louis School of Medicine
| | | | | | - Gyu Heo
- ashington University in St. Louis School of Medicine
| | - Sean English
- ashington University in St. Louis School of Medicine
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Affiliation(s)
- Wilfredo López-Ojeda
- Veterans Affairs Mid-Atlantic Mental Illness Research, Education and Clinical Center (MIRECC) and the Research and Academic Affairs Service Line, W. G. Hefner Veterans Affairs Medical Center, Salisbury, N.C. (López-Ojeda, Hurley); Department of Psychiatry and Behavioral Medicine (López-Ojeda, Hurley) and Department of Radiology (Hurley), Wake Forest School of Medicine, Winston-Salem, N.C.; Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston (Hurley)
| | - Robin A Hurley
- Veterans Affairs Mid-Atlantic Mental Illness Research, Education and Clinical Center (MIRECC) and the Research and Academic Affairs Service Line, W. G. Hefner Veterans Affairs Medical Center, Salisbury, N.C. (López-Ojeda, Hurley); Department of Psychiatry and Behavioral Medicine (López-Ojeda, Hurley) and Department of Radiology (Hurley), Wake Forest School of Medicine, Winston-Salem, N.C.; Menninger Department of Psychiatry and Behavioral Sciences, Baylor College of Medicine, Houston (Hurley)
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Li Z, Ramirez G, Tang R, Paul CKX, Nair M, Henderson S, Morimoto B, Liu J, Kaasgaard T, Boyd BJ, Wacker MG. Modeling digestion, absorption, and ketogenesis after administration of tricaprilin formulations to humans. Eur J Pharm Biopharm 2023; 182:41-52. [PMID: 36470522 DOI: 10.1016/j.ejpb.2022.11.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 11/10/2022] [Accepted: 11/22/2022] [Indexed: 12/12/2022]
Abstract
At present, tricaprilin is used as a ketogenic source for the management of mild to moderate Alzheimer's disease. After administration of the medium-chain triglyceride, tricaprilin is hydrolyzed to octanoic acid and further metabolized to ketones, acting as an alternative energy substrate for the brain. In this investigation, we developed a physiologically-based biopharmaceutics model simulating in vivo processes following the peroral administration of tricaprilin. The model includes multiple data sources to establish a partially verified framework for the simulation of plasma profiles. The input parameters were identified based on existing literature data and in vitro digestion studies. Model validation was conducted using the data from a phase I clinical trial. A partial parameter sensitivity analysis elucidated various influences on the plasma ketone levels that are mainly responsible for the therapeutic effects of tricaprilin. Based on our findings, we concluded that dispersibility and lipolysis of tricaprilin together with the gastric emptying patterns are limiting ketogenesis, while other steps such as the conversion of octanoic acid to ketone bodies play a minor role only.
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Affiliation(s)
- Zhuoxuan Li
- Department of Pharmacy, Faculty of Science, National University of Singapore, 4 Science Drive 2, Singapore 117544, Singapore
| | - Gisela Ramirez
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 381 Royal Pde, Parkville, Australia
| | - Rushi Tang
- Department of Pharmacy, Faculty of Science, National University of Singapore, 4 Science Drive 2, Singapore 117544, Singapore
| | - Cheong Kin Xian Paul
- Department of Pharmacy, Faculty of Science, National University of Singapore, 4 Science Drive 2, Singapore 117544, Singapore
| | - Murali Nair
- Cerecin Inc., 72 Anson Road, #06-01 Anson House, Singapore 079911, Singapore
| | - Samuel Henderson
- Cerecin Inc., 72 Anson Road, #06-01 Anson House, Singapore 079911, Singapore
| | - Bruce Morimoto
- Cerecin Inc., 72 Anson Road, #06-01 Anson House, Singapore 079911, Singapore
| | - Julie Liu
- Cerecin Inc., 72 Anson Road, #06-01 Anson House, Singapore 079911, Singapore
| | - Thomas Kaasgaard
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 381 Royal Pde, Parkville, Australia
| | - Ben J Boyd
- Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University (Parkville Campus), 381 Royal Pde, Parkville, Australia
| | - Matthias G Wacker
- Department of Pharmacy, Faculty of Science, National University of Singapore, 4 Science Drive 2, Singapore 117544, Singapore.
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Sui X, Wang H, Wu F, Yang C, Zhang H, Xu Z, Guo Y, Guo Z, Xin B, Ma T, Li Y, Dai Z. Hepatic metabolite responses to 4-day complete fasting and subsequent refeeding in rats. PeerJ 2022; 10:e14009. [PMID: 36157064 PMCID: PMC9504452 DOI: 10.7717/peerj.14009] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Accepted: 08/15/2022] [Indexed: 01/19/2023] Open
Abstract
Background Fasting has been widely used to improve various metabolic diseases in humans. Adaptive fasting is necessary for metabolic adaptation during prolonged fasting, which could overcome the great advantages of short-term fasting. The liver is the main organ responsible for energy metabolism and metabolic homeostasis. To date, we lack literature that describes the physiologically relevant adaptations of the liver during prolonged fasting and refeeding. For that reason, this study aims to evaluate the response of the liver of Sprague-Dawley (SD) rats to prolonged fasting and refeeding. Methods Sixty-six male SD rats were divided into the fasting groups, which were fasted for 0, 4, 8, 12, 24, 48, 72, or 96 h, and the refeeding groups, which were refed for 1, 3, or 6 days after 96 h of fasting. Serum glucose, TG, FFA, β-hydroxybutyrate, insulin, glucagon, leptin, adiponectin and FGF21 levels were assessed. The glucose content, PEPCK activity, TG concentration and FFA content were measured in liver tissue, and the expression of genes involved in gluconeogenesis (PEPCK and G6Pase), ketogenesis (PPARα, CPT-1a and HMGCS2) and the protein expression of nutrient-sensing signaling molecules (AMPK, mTOR and SIRT1) were determined by RT-qPCR and western blotting, respectively. Results Fasting significantly decreased the body weight, which was totally recovered to baseline after 3 days of refeeding. A 4-day fast triggered an energy metabolic substrate shift from glucose to ketones and caused serum hormone changes and changes in the protein expression levels of nutrient-sensing signaling molecules. Glycogenolysis served as the primary fuel source during the first 24 h of fasting, while gluconeogenesis supplied the most glucose thereafter. Serum FFA concentrations increased significantly with 48 h of fasting. Serum FFAs partly caused high serum β-hydroxybutyrate levels, which became an important energy source with the prolongation of the fasting duration. One day of refeeding quickly reversed the energy substrate switch. Nutrient-sensing signaling molecules (AMPK and SIRT1 but not mTOR signaling) were highly expressed at the beginning of fasting (in the first 4 h). Serum insulin and leptin decreased with fasting initiation, and serum glucagon increased, but adiponectin and FGF21 showed no significant changes. Herein, we depicted in detail the timing of the metabolic response and adaptation of the liver to a 4-day water-only fast and subsequent refeeding in rats, which provides helpful support for the design of safe prolonged and intermittent fasting regimens.
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Affiliation(s)
- Xiukun Sui
- Department of Electronic and Information Engineering, Harbin Institute of Technology at Shenzhen, Shenzhen, China,State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China,Space Science and Technology Institute, Shenzhen, China
| | - Hailong Wang
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China
| | - Feng Wu
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China
| | - Chao Yang
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China
| | - Hongyu Zhang
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China
| | - Zihan Xu
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China
| | - Yaxiu Guo
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China
| | - ZhiFeng Guo
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China
| | - Bingmu Xin
- Space Science and Technology Institute, Shenzhen, China
| | - Ting Ma
- Department of Electronic and Information Engineering, Harbin Institute of Technology at Shenzhen, Shenzhen, China
| | - Yinghui Li
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China
| | - Zhongquan Dai
- State Key Laboratory of Space Medicine Fundamentals and Application, China Astronaut Research and Training Center, Beijing, China
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Nasser S, Solé T, Vega N, Thomas T, Balcerczyk A, Strigini M, Pirola L. Ketogenic diet administration to mice after a high-fat-diet regimen promotes weight loss, glycemic normalization and induces adaptations of ketogenic pathways in liver and kidney. Mol Metab 2022;:101578. [PMID: 35995402 DOI: 10.1016/j.molmet.2022.101578] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 08/11/2022] [Accepted: 08/17/2022] [Indexed: 11/24/2022] Open
Abstract
Objective The ketogenic diet (KD), characterized by very limited dietary carbohydrate intake and used as nutritional treatment for GLUT1-deficiency syndromes and pharmacologically refractory epilepsy, may promote weight loss and improve metabolic fitness, potentially alleviating the symptoms of osteoarthritis. Here, we have studied the effects of administration of a ketogenic diet in mice previously rendered obese by feeding a high fat diet (HFD) and submitted to surgical destabilization of the medial meniscus to mimic osteoarthritis. Methods 6-weeks old mice were fed an HFD for 10 weeks and then switched to a chow diet (CD), KD or maintained on a HFD for 8 weeks. Glycemia, β-hydroxybutyrate (BHB), body weight and fat mass were compared among groups. In liver and kidney, protein expression and histone post-translational modifications were assessed by Western blot, and gene expression by quantitative Real-Time PCR. Results After a 10 weeks HDF feeding, administration for 8 weeks of a KD or CD induced a comparable weight loss and decrease in fat mass, with better glycemic normalization in the KD group. Histone β-hydroxybutyrylation, but not histone acetylation, was increased in the liver and kidney of mice fed the KD and the rate-limiting ketogenic enzyme HMGCS2 was upregulated – at the gene and protein level – in liver and, to an even greater extent, in kidney. KD-induced HMGCS2 overexpression may be dependent on FGF21, whose gene expression was increased by KD in liver. Conclusions Over a period of 8 weeks, KD is more effective than a chow diet to induce metabolic normalization. Besides acting as a fuel molecule, BHB may exert its metabolic effects through modulation of the epigenome - via histone β-hydroxybutyrylation - and extensive transcriptional modulation in liver and kidney. In mice fed a high fat diet, the dietary switch to a ketogenic diet causes weight loss and loss of fat mass. Glycemic normalization is superior than observed in mice fed a chow diet. Ketogenic diet induces mild ketosis, and β-hydroxybutyrylation on histone H3 lysines. Upregulation of rate limiting ketogenic protein HMGCS2 is observed in kidney. Ketogenic diet may be a transitory nutritional intervention to favor weight loss.
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Correction: Novel insights in endocrine and metabolic pathways in sepsis and gaps for future research. Clin Sci (Lond) 2022; 136:1045. [PMID: 35786749 DOI: 10.1042/CS-2021-1003C_COR] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
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Téblick A, Gunst J, Langouche L, Van den Berghe G. Novel insights in endocrine and metabolic pathways in sepsis and gaps for future research. Clin Sci (Lond) 2022; 136:861-78. [PMID: 35642779 DOI: 10.1042/CS20211003] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 05/17/2022] [Accepted: 05/19/2022] [Indexed: 11/17/2022]
Abstract
Sepsis is defined as any life-threatening organ dysfunction caused by a dysregulated host response to infection. It remains an important cause of critical illness and has considerable short- and long-term morbidity and mortality. In the last decades, preclinical and clinical research has revealed a biphasic pattern in the (neuro-)endocrine responses to sepsis as to other forms of critical illness, contributing to development of severe metabolic alterations. Immediately after the critical illness-inducing insult, fasting- and stress-induced neuroendocrine and cellular responses evoke a catabolic state in order to provide energy substrates for vital tissues, and to concomitantly activate cellular repair pathways while energy-consuming anabolism is postponed. Large randomized controlled trials have shown that providing early full feeding in this acute phase induced harm and reversed some of the neuro-endocrine alterations, which suggested that the acute fasting- and stress-induced responses to critical illness are likely interlinked and benefical. However, it remains unclear whether, in the context of accepting virtual fasting in the acute phase of illness, metabolic alterations such as hyperglycemia are harmful or beneficial. When patients enter a prolonged phase of critical illness, a central suppression of most neuroendocrine axes follows. Prolonged fasting and central neuroendocrine suppression may no longer be beneficial. Although pilot studies have suggested benefit of fasting-mimicking diets and interventions that reactivate the central neuroendocrine suppression selectively in the prolonged phase of illness, further study is needed to investigate patient-oriented outcomes in larger randomized trials.
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Asif S, Kim RY, Fatica T, Sim J, Zhao X, Oh Y, Denoncourt A, Cheung A, Downey M, Mulvihill EE, Kim KH. Hmgcs2-mediated ketogenesis modulates high-fat diet-induced hepatosteatosis. Mol Metab 2022; 61:101494. [PMID: 35421611 PMCID: PMC9039870 DOI: 10.1016/j.molmet.2022.101494] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 04/01/2022] [Accepted: 04/04/2022] [Indexed: 12/11/2022] Open
Abstract
OBJECTIVE Aberrant ketogenesis is correlated with the degree of steatosis in NAFLD patients, and an inborn error of ketogenesis (mitochondrial HMG-CoA synthase deficiency) is commonly associated with the development of the fatty liver. Here we aimed to determine the impact of Hmgcs2-mediated ketogenesis and its modulations on the development and treatment of fatty liver disease. METHODS Loss- and gain-of-ketogenic function through in vivo and in vitro models, achieved by Hmgcs2 knockout and overexpression, respectively, were examined to investigate the role of ketogenesis in the hepatic lipid accumulation during neonatal development and the diet-induced NAFLD mouse model. RESULTS Ketogenic function was decreased in NAFLD mice with a reduction in Hmgcs2 expression. Mice lacking Hmgcs2 developed spontaneous fatty liver phenotype during postnatal development, which was rescued by a shift to a low-fat dietary composition via early weaning. Hmgcs2 heterozygous mice, which exhibited reduced ketogenic activity, were more susceptible to diet-induced NAFLD development, whereas HMGCS2 overexpression in NAFLD mice improved hepatosteatosis and glucose homeostasis. CONCLUSIONS Our study adds new knowledge to the field of ketone body metabolism and shows that Hmgcs2-mediated ketogenesis modulates hepatic lipid regulation under a fat-enriched nutritional environment. The regulation of hepatic ketogenesis may be a viable therapeutic strategy in the prevention and treatment of hepatosteatosis.
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Affiliation(s)
- Shaza Asif
- University of Ottawa Heart Institute, Ottawa, ON, K1Y 4W7, Canada; Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, K1H 8M5, Canada
| | - Ri Youn Kim
- University of Ottawa Heart Institute, Ottawa, ON, K1Y 4W7, Canada
| | - Thet Fatica
- University of Ottawa Heart Institute, Ottawa, ON, K1Y 4W7, Canada
| | - Jordan Sim
- Department of Pathology and Laboratory Medicine, The Ottawa Hospital, Ottawa, ON, K1H 8M5, Canada
| | - Xiaoling Zhao
- University of Ottawa Heart Institute, Ottawa, ON, K1Y 4W7, Canada
| | - Yena Oh
- University of Ottawa Heart Institute, Ottawa, ON, K1Y 4W7, Canada; Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, K1H 8M5, Canada
| | - Alix Denoncourt
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, K1H 8M5, Canada; Ottawa Institute of Systems Biology, Ottawa, ON, K1H 8M5, Canada
| | - Angela Cheung
- Gastroenterology and Hepatology, Department of Medicine, The Ottawa Hospital, Ottawa, ON, K1H 8M5, Canada; The Ottawa Hospital Research Institute, Chronic Disease Program, Ottawa, ON, K1Y 4E9, Canada
| | - Michael Downey
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, K1H 8M5, Canada; Ottawa Institute of Systems Biology, Ottawa, ON, K1H 8M5, Canada
| | - Erin E Mulvihill
- University of Ottawa Heart Institute, Ottawa, ON, K1Y 4W7, Canada; Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, K1H 8M5, Canada
| | - Kyoung-Han Kim
- University of Ottawa Heart Institute, Ottawa, ON, K1Y 4W7, Canada; Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, K1H 8M5, Canada.
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Gruber N, Rathaus M, Ron I, Livne R, Sheinvald S, Barhod E, Hemi R, Tirosh A, Pinhas-Hamiel O, Tirosh A. Fatty acid-binding protein 4: a key regulator of ketoacidosis in new-onset type 1 diabetes. Diabetologia 2022; 65:366-374. [PMID: 34806114 DOI: 10.1007/s00125-021-05606-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2021] [Accepted: 09/06/2021] [Indexed: 02/05/2023]
Abstract
AIMS/HYPOTHESIS Fatty acid-binding protein 4 (FABP4) is an adipokine with a key regulatory role in glucose and lipid metabolism. We prospectively evaluated the role of FABP4 in the pathophysiology of diabetic ketoacidosis (DKA) in new-onset type 1 diabetes. METHODS Clinical and laboratory data were prospectively collected from consecutive children presenting with new-onset type 1 diabetes. In addition to blood chemistry and gases, insulin, C-peptide, serum FABP4 and NEFA were collected upon presentation and 48 h after initiation of insulin treatment. In a mouse model of type 1 diabetes, glucose, insulin, β-hydroxybutyrate and weight were compared between FABP4 knockout (Fabp4-/-) and wild-type (WT) mice. RESULTS Included were 33 children (mean age 9.3 ± 3.5 years, 52% male), of whom 14 (42%) presented with DKA. FABP4 levels were higher in the DKA group compared with the non-DKA group (median [IQR] 10.1 [7.9-14.2] ng/ml vs 6.3 [3.9-7] ng/ml, respectively; p = 0.005). The FABP4 level was positively correlated with HbA1c at presentation and inversely correlated with venous blood pH and bicarbonate levels (p < 0.05 for all). Following initiation of insulin therapy, a marked reduction in FABP4 was observed in all children. An FABP4 level of 7.22 ng/ml had a sensitivity of 86% and a specificity of 78% for the diagnosis of DKA, with an area under the receiver operating characteristic curve of 0.78 (95% CI 0.6, 0.95; p = 0.008). In a streptozotocin-induced diabetes mouse model, Fabp4-/- mice exhibited marked hypoinsulinaemia and hyperglycaemia similar to WT mice but displayed no significant increase in β-hydroxybutyrate and were protected from ketoacidosis. CONCLUSIONS/INTERPRETATION FABP4 is suggested to be a necessary regulator of ketogenesis in insulin-deficient states.
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Affiliation(s)
- Noah Gruber
- Pediatric Endocrine and Diabetes Unit, Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Ramat Gan, Israel.
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel.
| | - Moran Rathaus
- The Dalia and David Arabov Diabetes Research Center, Division of Endocrinology, Diabetes and Metabolism, Sheba Medical Center, Tel-Hashomer, Israel
| | - Idit Ron
- The Dalia and David Arabov Diabetes Research Center, Division of Endocrinology, Diabetes and Metabolism, Sheba Medical Center, Tel-Hashomer, Israel
| | - Rinat Livne
- The Dalia and David Arabov Diabetes Research Center, Division of Endocrinology, Diabetes and Metabolism, Sheba Medical Center, Tel-Hashomer, Israel
| | - Sharon Sheinvald
- Pediatric Endocrine and Diabetes Unit, Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Ramat Gan, Israel
| | - Ehud Barhod
- The Dalia and David Arabov Diabetes Research Center, Division of Endocrinology, Diabetes and Metabolism, Sheba Medical Center, Tel-Hashomer, Israel
| | - Rina Hemi
- The Dalia and David Arabov Diabetes Research Center, Division of Endocrinology, Diabetes and Metabolism, Sheba Medical Center, Tel-Hashomer, Israel
| | - Amit Tirosh
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel
- The Dalia and David Arabov Diabetes Research Center, Division of Endocrinology, Diabetes and Metabolism, Sheba Medical Center, Tel-Hashomer, Israel
| | - Orit Pinhas-Hamiel
- Pediatric Endocrine and Diabetes Unit, Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Ramat Gan, Israel
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Amir Tirosh
- Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel.
- The Dalia and David Arabov Diabetes Research Center, Division of Endocrinology, Diabetes and Metabolism, Sheba Medical Center, Tel-Hashomer, Israel.
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13
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Modica LCM, Flores-Felix K, Casachahua LJD, Asquith P, Tschiffely A, Ciarlone S, Ahlers ST. Impact of ketogenic diet and ketone diester supplementation on body weight, blood glucose, and ketones in Sprague Dawley rats fed over two weeks. Food Chem (Oxf) 2021; 3:100029. [PMID: 35415644 PMCID: PMC8991993 DOI: 10.1016/j.fochms.2021.100029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 06/02/2021] [Accepted: 06/04/2021] [Indexed: 12/15/2022]
Abstract
Ketogenic diet influenced ketones, weight, and glucose in rats. Ketone diester supplement (20% by weight) was similar to ketogenic diet, but its effects on ketones and weight was smaller and it did not affect glucose. Changeover from standard diet to ketogenic diet resulted in sex-specific glucose changes.
Ketogenic diets consist of low carbohydrate/high fat, shifting energy reliance from glucose to ketone bodies. Ketone diester supplement to a standard diet (ketone ester) increases ketone bodies by adding a substance without altering other consumed foods. We evaluated weight, glucose, and ketone concentrations in rats fed ketogenic diet and ketone ester feeds. We hypothesized that these feeds would increase ketones and decrease glucose and weight. We tested 16 male and 16 female Sprague Dawley rats randomly assigned to standard diet, ketogenic diet, or ketone ester for two weeks. Weight and blood glucose and ketones were measured daily. Group means were compared by analysis of variance. Ketogenic diet and ketone ester both increased ketones and decreased weight compared to standard diet (p < 0.001). Glucose decreased only in ketogenic diet (p = 0.010), driven by a decrease from higher starting concentrations observed in standard diet males. Sex interacted with weight, with male gains impacted more by both ketogenic diet and ketone ester than female gains. Ketogenic diet had a larger effect size than ketone ester with regard to increased ketones and decreased weight. Ketogenic diet glucose significantly decreased over time because standard diet concentrations in males were high prior to initializing ketogenic diet. This suggests sex differences in energy substrate utilization. Ketogenic diet ketones peaked at 72 h then decreased to near basal levels at about 10 days, suggesting “fat adaption.” While this work is part of a larger project examining blast exposure, these results are relevant to any military forces considering ketone-increasing foods.
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Affiliation(s)
| | - Krystal Flores-Felix
- Naval Medical Research Center, Silver Spring, MD, United States.,Universidad Ana G. Méndez, Gurabo Campus, PR, United States
| | | | - Paul Asquith
- Naval Medical Research Center, Silver Spring, MD, United States.,Hazel Green High School, Hazel Green, AL, United States.,Huntingdon College, Montgomery, AL, United States
| | - Anna Tschiffely
- Naval Medical Research Center, Silver Spring, MD, United States
| | - Stephanie Ciarlone
- Naval Medical Research Center, Silver Spring, MD, United States.,The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc., Bethesda, MD, United States
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14
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Nanjappa D, Liang Y, Bretherton L, Brown C, Quigg A, Irwin AJ, Finkel ZV. Contrasting transcriptomic responses of a microbial eukaryotic community to oil and dispersant. Environ Pollut 2021; 288:117774. [PMID: 34274645 DOI: 10.1016/j.envpol.2021.117774] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 07/05/2021] [Accepted: 07/08/2021] [Indexed: 06/13/2023]
Abstract
Dispersants can aid dispersion and biodegradation of oil in seawater, but the wider ecotoxicological effects of oil and dispersant to the base of marine food webs is unclear. Here we apply a metatranscriptomic approach to identify molecular responses of a natural marine microbial eukaryotic community to oil and chemically dispersed oil. Oil exposure stimulated the upregulation of ketogenesis in the eukaryotic community, which may alleviate carbon- and energy-limitation and reduce oxidative stress. In contrast, a chemically dispersed oil treatment stimulated eukaryotic genes and pathways consistent with nitrogen and oxygen depletion. These results suggest that the addition of dispersant may elevate bacterial biodegradation of crude oil, indirectly increasing competition for nitrogen between prokaryotic and eukaryotic communities as oxygen consumption induces bacterial anaerobic respiration and denitrification. Eukaryotic microbial communities may mitigate some of the negative effects of oil exposure such as reduced photosynthesis and elevated oxidative stress, through ketosis, but the addition of dispersant to the oil fundamentally alters the environmental and ecological conditions and therefore the biochemical response of the eukaryotic community.
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Affiliation(s)
- Deepak Nanjappa
- Department of Oceanography, Dalhousie University, Halifax, NS, Canada.
| | - Yue Liang
- Department of Oceanography, Dalhousie University, Halifax, NS, Canada
| | - Laura Bretherton
- Department of Oceanography, Dalhousie University, Halifax, NS, Canada
| | - Chris Brown
- Environmental Science Program, Mount Allison University, Sackville, NB, Canada
| | - Antonietta Quigg
- Department of Marine Biology, Texas A&M University at Galveston, Galveston, TX, USA
| | - Andrew J Irwin
- Department of Oceanography, Dalhousie University, Halifax, NS, Canada; Department of Mathematics & Statistics, Dalhousie University, Halifax, NS, Canada
| | - Zoe V Finkel
- Department of Oceanography, Dalhousie University, Halifax, NS, Canada
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15
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Gunst J, De Bruyn A, Casaer MP, Vander Perre S, Langouche L, Van den Berghe G. Impact of tight glucose control on circulating 3-hydroxybutyrate in critically ill patients. Crit Care 2021; 25:373. [PMID: 34696774 DOI: 10.1186/s13054-021-03772-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 09/14/2021] [Indexed: 12/13/2022]
Abstract
BACKGROUND Recent evidence suggests a potentially protective effect of increasing ketone body availability via accepting low macronutrient intake early after onset of critical illness. The impact of blood glucose control with insulin on circulating ketones is unclear. Whereas lowering blood glucose may activate ketogenesis, high insulin concentrations may have the opposite effect. We hypothesized that the previously reported protective effects of tight glucose control in critically ill patients receiving early parenteral nutrition may have been mediated in part by activation of ketogenesis. METHODS This is a secondary analysis of 3 randomized controlled trials on tight versus liberal blood glucose control in the intensive care unit, including 700 critically ill children and 2748 critically ill adults. All patients received early parenteral nutrition as part of the contemporary standard of care. Before studying a potential mediator role of circulating ketones in improving outcome, we performed a time course analysis to investigate whether tight glucose control significantly affected ketogenesis and to identify a day of maximal effect, if any. We quantified plasma/serum 3-hydroxybutyrate concentrations from intensive care unit admission until day 3 in 2 matched subsets of 100 critically ill children and 100 critically ill adults. Univariable differences between groups were investigated by Kruskal-Wallis test. Differences in 3-hydroxybutyrate concentrations between study days were investigated by Wilcoxon signed-rank test. RESULTS In critically ill children and adults receiving early parenteral nutrition, tight glucose control, as compared with liberal glucose control, lowered mean morning blood glucose on days 1-3 (P < 0.0001) via infusing insulin at a higher dose (P < 0.0001). Throughout the study period, caloric intake was not different between groups. In both children and adults, tight glucose control did not affect 3-hydroxybutyrate concentrations, which were suppressed on ICU days 1-3 and significantly lower than the ICU admission values for both groups (P < 0.0001). CONCLUSION Tight versus liberal glucose control in the context of early parenteral nutrition did not affect 3-hydroxybutyrate concentrations in critically ill patients. Hence, the protective effects of tight glucose control in this context cannot be attributed to increased ketone body availability.
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Han P, Wang Y, Luo W, Lu Y, Zhou X, Yang Y, Zheng Q, Li D, Wu S, Li L, Zhang H, Zhao J, Zhang Z, Matskova L, Li P, Zhou X. Epigenetic inactivation of hydroxymethylglutaryl CoA synthase reduces ketogenesis and facilitates tumor cell motility in clear cell renal carcinoma. Pathol Res Pract 2021; 227:153622. [PMID: 34624592 DOI: 10.1016/j.prp.2021.153622] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Revised: 09/16/2021] [Accepted: 09/16/2021] [Indexed: 10/20/2022]
Abstract
Previously, we have reported that the dysregulation of ketogenesis plays an important role in the carcinogenesis of clear cell renal cell carcinoma (ccRCC). Here, we demonstrate decreased expression of the HMGCS2 gene in ccRCC, a critical enzyme for the synthesis of the ketone body β-hydroxybutyrate (β-OHB). We found that the reduced transcription of the HMGCS2 gene in ccRCC cells was significantly correlated to a higher relative methylation rate in its promotor region. The higher methylation rate in the region of the transcription start site and 1st exon of the HMGCS2 gene was, in turn, correlated with a worse clinical outcome for patients. The transcription of HMGCS2 was possible to restore by treatment with 5-aza-2'-deoxycytidine and with the histone deacetylase inhibitor β-OHB. Therefore, the low levels of the HMGCS2 enzyme in ccRCC may be the consequence of hypermethylation of the HMGCS2 promotor. The ensuing reduction in the ketone body levels further suppresses the transcription of HMGCS2 via a feedback loop. Ectopic expression of HMGCS2 attenuates the migration and invasion of ccRCC but does not affect the proliferative capacity of ccRCC cells in vitro. In addition, we showed that ectopic expression of HMGCS2 boosts the intracellular levels of β-OHB and that exogenously applied β-OHB suppresses the motility and invasion of ccRCC. Our study reveals crosstalk between genes that regulate metabolism and their metabolites, thus providing a better understanding of the epigenetic mechanism involved in ccRCC carcinogenesis and suggesting opportunities for metabolic therapy of tumors. Initially, we suggest that the mRNA level of HMGCS2 could serve as a potentially valuable diagnostic (AUC = 0.918, p < 0.001) and prognostic biomarker.
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Affiliation(s)
- Peipei Han
- Key Laboratory of High-Incidence-Tumor Prevention & Treatment (Guangxi Medical University), Ministry of Education, Nanning, China; Department of Pathology, First Affiliated Hospital of Guangxi Medical University, Nanning, China
| | - Yifang Wang
- Life Science Institute, Guangxi Medical University, Nanning, China
| | - Wenqi Luo
- Department of Pathology, Guangxi Medical University Cancer Hospital, Nanning, China
| | - Yunliang Lu
- Key Laboratory of High-Incidence-Tumor Prevention & Treatment (Guangxi Medical University), Ministry of Education, Nanning, China
| | - Xiaohui Zhou
- Life Science Institute, Guangxi Medical University, Nanning, China
| | - Yanping Yang
- Key Laboratory of High-Incidence-Tumor Prevention & Treatment (Guangxi Medical University), Ministry of Education, Nanning, China
| | - Qian Zheng
- Life Science Institute, Guangxi Medical University, Nanning, China
| | - Danping Li
- Key Laboratory of High-Incidence-Tumor Prevention & Treatment (Guangxi Medical University), Ministry of Education, Nanning, China
| | - Shu Wu
- Key Laboratory of High-Incidence-Tumor Prevention & Treatment (Guangxi Medical University), Ministry of Education, Nanning, China
| | - Limei Li
- Key Laboratory of High-Incidence-Tumor Prevention & Treatment (Guangxi Medical University), Ministry of Education, Nanning, China
| | - Haishan Zhang
- Key Laboratory of High-Incidence-Tumor Prevention & Treatment (Guangxi Medical University), Ministry of Education, Nanning, China
| | - Jun Zhao
- Key Laboratory of High-Incidence-Tumor Prevention & Treatment (Guangxi Medical University), Ministry of Education, Nanning, China
| | - Zhe Zhang
- Key Laboratory of High-Incidence-Tumor Prevention & Treatment (Guangxi Medical University), Ministry of Education, Nanning, China
| | - Liudmila Matskova
- Institute of Living Systems, Immanuel Kant Baltic Federal University, Kaliningrad, Russia
| | - Ping Li
- Department of Pathology, First Affiliated Hospital of Guangxi Medical University, Nanning, China; Department of Pathology, College & Hospital of Stomatology Guangxi Medical University, Nanning, China.
| | - Xiaoying Zhou
- Key Laboratory of High-Incidence-Tumor Prevention & Treatment (Guangxi Medical University), Ministry of Education, Nanning, China; Life Science Institute, Guangxi Medical University, Nanning, China.
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Lin Y, Chen L, You X, Li Z, Li C, Chen Y. PAQR9 regulates hepatic ketogenesis and fatty acid oxidation during fasting by modulating protein stability of PPARα. Mol Metab 2021; 53:101331. [PMID: 34474167 DOI: 10.1016/j.molmet.2021.101331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2021] [Revised: 08/12/2021] [Accepted: 08/27/2021] [Indexed: 11/24/2022] Open
Abstract
BACKGROUND The cycle of feeding and fasting is fundamental to life and closely coordinated with changes of metabolic programs. During extended starvation, ketogenesis coupled with fatty acid oxidation in the liver supplies ketone bodies to extrahepatic tissues as the major form of fuel. In this study, we demonstrated that PAQR9, a member of the progesterone and adipoQ receptor family, has a regulatory role on hepatic ketogenesis. METHODS We analyzed the phenotype of Paqr9-deleted mice. We also used biochemical methods to investigate the interaction of PAQR9 with PPARα and HUWE1, an E3 ubiquitin ligase. RESULTS The expression of Paqr9 was decreased during fasting partly depending on PPARγ. The overall phenotype of the mice was not altered by Paqr9 deletion under normal chow feeding. However, fasting-induced ketogenesis and fatty acid oxidation were attenuated by Paqr9 deletion. Mechanistically, Paqr9 deletion decreased protein stability of PPARα via enhancing its poly-ubiquitination. PAQR9 competed with HUWE1 for interaction with PPARα, thus preventing ubiquitin-mediated degradation of PPARα. CONCLUSION Our study reveals that PAQR9 impacts starvation-mediated metabolic changes in the liver via post-translational regulation of PPARα.
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Kim JT, Napier DL, Kim J, Li C, Lee EY, Weiss HL, Wang Q, Evers BM. Ketogenesis alleviates TNFα-induced apoptosis and inflammatory responses in intestinal cells. Free Radic Biol Med 2021; 172:90-100. [PMID: 34087430 PMCID: PMC8355065 DOI: 10.1016/j.freeradbiomed.2021.05.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 05/21/2021] [Accepted: 05/22/2021] [Indexed: 12/20/2022]
Abstract
The disturbance of strictly regulated self-regeneration in mammalian intestinal epithelium is associated with various intestinal disorders, particularly inflammatory bowel diseases (IBDs). TNFα, which plays a critical role in the pathogenesis of IBDs, has been reported to inhibit production of ketone bodies such as β-hydroxybutyrate (βHB). However, the role of ketogenesis in the TNFα-mediated pathological process is not entirely known. Here, we showed the regulation and role of HMGCS2, the rate-limiting enzyme of ketogenesis, in TNFα-induced apoptotic and inflammatory responses in intestinal epithelial cells. Treatment with TNFα dose-dependently decreased protein and mRNA expression of HMGCS2 and its product, βHB production in human colon cancer cell lines HT29 and Caco2 cells and mouse small intestinal organoids. Moreover, the repressed level of HMGCS2 protein was found in intestinal epithelium of IBD patients with Crohn's disease and ulcerative colitis as compared with normal tissues. Furthermore, knockdown of HMGCS2 enhanced and in contrast, HMGCS2 overexpression attenuated, the TNFα-induced apoptosis and expression of pro-inflammatory chemokines (CXCL1-3) in HT29, Caco2 cells and DLD1 cells, respectively. Treatment with βHB or rosiglitazone, an agonist of PPARγ, which increases ketogenesis, attenuated TNFα-induced apoptosis in the intestinal epithelial cells. Finally, HMGCS2 knockdown enhanced TNFα-induced reactive oxygen species (ROS) generation. In addition, hydrogen peroxide, the major ROS contributing to intestine injury, decreased HMGCS2 expression and βHB production in the intestinal cells and mouse organoids. Our findings demonstrate that increased ketogenesis attenuates TNFα-induced apoptosis and inflammation in intestinal cells, suggesting a protective role for ketogenesis in TNFα-induced intestinal pathologies.
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Affiliation(s)
- Ji Tae Kim
- Markey Cancer Center, Lexington, KY, 40536, USA
| | | | - Jinhwan Kim
- Markey Cancer Center, Lexington, KY, 40536, USA
| | - Chang Li
- Markey Cancer Center, Lexington, KY, 40536, USA
| | - Eun Y Lee
- Department of Pathology and Laboratory Medicine, Department of Surgery, Lexington, KY, 40536, USA
| | | | - Qingding Wang
- Markey Cancer Center, Lexington, KY, 40536, USA; Department of Surgery, University of Kentucky, Lexington, KY, 40536, USA.
| | - B Mark Evers
- Markey Cancer Center, Lexington, KY, 40536, USA; Department of Surgery, University of Kentucky, Lexington, KY, 40536, USA.
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Provensi G, Costa A, Rani B, Blandina P, Passani MB. A Duet Between Histamine and Oleoylethanolamide in the Control of Homeostatic and Cognitive Processes. Curr Top Behav Neurosci 2021. [PMID: 34410679 DOI: 10.1007/7854_2021_236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
In ballet, a pas de deux (in French it means "step of two") is a duet in which the two dancers perform ballet steps together. The suite of dances shares a common theme of partnership. How could we better describe the fine interplay between oleoylethanolamide (OEA) and histamine, two phylogenetically ancient molecules controlling metabolic, homeostatic and cognitive processes? Contrary to the pas de deux though, the two dancers presumably never embrace each other as a dancing pair but execute their "virtuoso solo" constantly exchanging interoceptive messages presumably via vagal afferents, the blood stream, the neuroenteric system. With one exception, which is in the control of liver ketogenesis, as in hepatocytes, OEA biosynthesis strictly depends on the activation of histaminergic H1 receptors. In this review, we recapitulate our main findings that evidence the interplay of histamine and OEA in the control of food consumption and eating behaviour, in the consolidation of emotional memory and mood, and finally, in the synthesis of ketone bodies. We will also summarise some of the putative underlying mechanisms for each scenario.
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da Rocha AF, Pereira Junior PS, Calefi GS, Marquezine GF, Morimoto HK, Mazzuco TL, de Faria EC, Urbano MR, Carrilho AJF. Growth hormone directly favors hepatic ketogenesis in persons with prediabetes or type 2 diabetes mellitus treated with empagliflozin. Endocrine 2021; 73:325-330. [PMID: 33871793 DOI: 10.1007/s12020-021-02730-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Accepted: 04/09/2021] [Indexed: 11/25/2022]
Abstract
PURPOSE Sodium-glucose cotransporter 2 inhibitors increase glucagon secretion by pancreatic alpha cells and the susceptibility to ketoacidosis. On the other hand, growth hormone (GH) stimulates peripheral lipolysis and provides free fatty acids (FFA) for ketogenesis; however, it remains unresolved whether GH directly impacts hepatic ketogenesis. We aimed to investigate the role of physiologic GH levels in promoting ketogenesis in prediabetic or type 2 diabetic patients under empagliflozin treatment. METHODS Sixteen patients (11 women, 5 men) with prediabetes or type 2 diabetes mellitus, aged 55.6 ± 4.7 years and with a mean BMI of 30.7 ± 4.8 kg/m2 and HbA1c 7.1 ± 1.6% (means ± SD), participated in this study. All of them were submitted to three mixed-meal tests: they received placebo at -60 min (test 1), and empagliflozin 25 mg (test 2, 21st day) and empagliflozin 25 mg plus pegvisomant 30 mg were administered subcutaneously 36 h before (test 3, 28th day). After test 1, all patients were instructed to take empagliflozin 25 mg daily. RESULTS The empagliflozin treatment decreased the plasma concentrations of glucose by 14% (P < 0.01), FFA by 23% (P < 0.01), and the insulin/glucagon ratio by 26% (P < 0.01), and it increased β-hydroxybutyrate by 44% (P < 0.05). The GH receptor block by pegvisomant restored the plasma β-hydroxybutyrate to baseline levels. CONCLUSIONS We conclude that GH has a direct effect on promoting the ketogenesis environment in patients treated with empagliflozin.
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Affiliation(s)
- Aline Franco da Rocha
- Post-graduation Program of Health Sciences, Londrina State University, Londrina, Brazil
| | | | | | | | - Helena Kaminami Morimoto
- Department of Pathology, Clinical and Toxicological Analysis, Health Sciences Center, Londrina State University, Londrina, Brazil
| | - Tania Longo Mazzuco
- Division of Endocrinology, Department of Internal Medicine, Londrina State University, Londrina, Brazil
| | - Eliana Cotta de Faria
- Lipids Laboratory, Department of Clinical Pathology, Faculty of Medical Sciences, State University of Campinas, Sao Paulo, Brazil
| | | | - Alexandre Jose Faria Carrilho
- Post-graduation Program of Health Sciences, Londrina State University, Londrina, Brazil.
- Division of Endocrinology, Department of Internal Medicine, Londrina State University, Londrina, Brazil.
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Jin ES, Lee MH, Malloy CR. The presence of 3-hydroxypropionate and 1,3-propanediol suggests an alternative path for conversion of glycerol to Acetyl-CoA. Metabol Open 2021; 9:100086. [PMID: 33733082 PMCID: PMC7940983 DOI: 10.1016/j.metop.2021.100086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 02/19/2021] [Accepted: 02/19/2021] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND In our recent study using [U-13C3]glycerol, a small subset of hamsters showed an unusual profile of glycerol metabolism: negligible gluconeogenesis from glycerol plus conversion of glycerol to 1,3-propanediol (1,3PDO) and 3-hydroxypropionate (3HP) which were detected in the liver and blood. The purpose of the current study is to evaluate the association of these unusual glycerol products with other biochemical processes in the liver. METHODS Fasted hamsters received acetaminophen (400 mg/kg; n = 16) or saline (n = 10) intraperitoneally. After waiting 2 h, all the animals received [U-13C3]glycerol intraperitoneally. Liver and blood were harvested 1 h after the glycerol injection for NMR analysis and gene expression assays. RESULTS 1,3PDO and 3HP derived from [U-13C3]glycerol were detected in the liver and plasma of eight hamsters (two controls and six hamsters with acetaminophen treatment). Glycerol metabolism in the liver of these animals differed substantially from conventional metabolic pathways. [U-13C3]glycerol was metabolized to acetyl-CoA as evidenced with downstream products detected in glutamate and β-hydroxybutyrate, yet 13C labeling in pyruvate and glucose was minimal (p < 0.001, 13C labeling difference in each metabolite). Expression of aldehyde dehydrogenases was enhanced in hamster livers with 1,3PDO and 3HP (p < 0.05). CONCLUSION Detection of 1,3PDO and 3HP in the hamster liver was associated with unorthodox metabolism of glycerol characterized by conversion of 3HP to acetyl-CoA followed by ketogenesis and oxidative metabolism through the TCA cycle. Additional mechanistic studies are needed to determine the causes of unusual glycerol metabolism in a subset of these hamsters.
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Key Words
- 1,3-Propanediol
- 1,3PDO, 1,3-propanediol
- 3-Hydroxypropionate
- 3HP, 3-hydroxypropionate
- 3HPA, 3-hydroxypropionaldehyde
- ACC, acetyl-CoA carboxylase
- ALDH, aldehyde dehydrogenase
- Aldehyde dehydrogenase
- DHAP, dihydroxyacetone phosphate
- G3P, glycerol 3-phosphate
- GA3P, glyceraldehyde 3-phosphate
- GAPDH, glyceraldehyde 3-phosphate dehydrogenase
- GK, glycerol kinase
- Glu, glutamate
- Gluconeogenesis
- GlyDH, glycerol dehydrogenase
- Ketogenesis
- OAA, oxaloacetate
- Oxidative metabolism
- PCC, propionyl-CoA carboxylase
- PDH, pyruvate dehydrogenase
- α-kG, α-ketoglutarate
- β-HB, β-hydroxybutyrate
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Affiliation(s)
- Eunsook S. Jin
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA
- Department of Internal Medicine, University of Texas Southwestern Medical Center, USA
| | - Min H. Lee
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA
| | - Craig R. Malloy
- Advanced Imaging Research Center, University of Texas Southwestern Medical Center, Dallas, TX, 75390, USA
- Department of Internal Medicine, University of Texas Southwestern Medical Center, USA
- Department of Radiology, University of Texas Southwestern Medical Center, USA
- VA North Texas Health Care System, Dallas, TX, 75216, USA
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22
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Bertoccini L, Baroni MG. GLP-1 Receptor Agonists and SGLT2 Inhibitors for the Treatment of Type 2 Diabetes: New Insights and Opportunities for Cardiovascular Protection. Adv Exp Med Biol 2021; 1307:193-212. [PMID: 32034729 DOI: 10.1007/5584_2020_494] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The risk of cardiovascular disease (CVD) (myocardial infarction, stroke, peripheral vascular disease) is twice in type 2 diabetes (T2D) patients compared to non-diabetic subjects. Furthermore, cardiovascular disease (CV) is the leading cause of death in patients with T2D.In the last years several clinical intervention studies with new anti-hyperglycaemic drugs have been published, and they have shown a positive effect on the reduction of mortality and cardiovascular risk in T2D patients. In particular, these studies evaluated sodium/glucose-2 cotransporter inhibitors (SGLT2i) and Glucagon-like peptide-1 receptor agonists (GLP-1RA).In secondary prevention, it was clearly demonstrated that SGLT2i and GLP-1RA drugs reduce CV events and mortality, and new guidelines consider now these drugs as first choice (after metformin) in the treatment of T2D; there are also some signs that they may be effective also in primary prevention of CVD. However, the mechanisms involved in cardiovascular protection are not yet fully understood, but they appear to be both "glycaemic" and "extra-glycaemic".In this review, we will examine the fundamental results of the clinical trials on SGLT2i and GLP-1RA, their clinical relevance in term of treatment of T2D, and we will discuss the mechanisms that may explain how these drugs exert their cardiovascular protective effects.
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Abduraman MA, Azizan NA, Teoh SH, Tan ML. Ketogenesis and SIRT1 as a tool in managing obesity. Obes Res Clin Pract 2020; 15:10-18. [PMID: 33371997 DOI: 10.1016/j.orcp.2020.12.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 10/21/2020] [Accepted: 12/01/2020] [Indexed: 12/14/2022]
Abstract
Obesity is a serious chronic disease and a public health concern in both developing and developed countries. Managing obesity has been a great challenge for both health care professionals and patients alike. Among the various diet programs aimed at promoting weight loss, the ketogenic diet, a diet high in fat and low in carbohydrates, has been at the forefront recently and its mechanism in weight loss is much debated. Activation of Sirtuin 1 or SIRT1 is able to circumvent various diseases, including metabolic syndrome and obesity and is thought to be a potentially reliable treatment target for both of them. Augmentation of SIRT1 may be carried out using dietary means such as nicotinamide adenine dinucleotide (NAD) supplementation and/or ketogenic diet. Although ketogenic diet may augment SIRT1 activation in people affected by obesity, recent studies have indicated that the relationship between SIRT1 and ketogenesis is unpredictable. The exact circumstances and mechanisms of SIRT1, NAD and ketogenesis in the clinical setting as an intervention tool in managing obesity remained uncertain. Although several recent literatures have documented significant weight-loss following ketogenic diet interventions, there were limitations with regards to duration of trial, choice and the number of trial subjects. Studies investigating the safety of ketogenic diet in the long term, beyond 46 weeks and related mechanism and pathways are still lacking and the sustainability of this diet remains to be determined. This review explores the recent progress on ketogenic diet and its relationships with SIRT1 as a tool in managing obesity and relevant clinical implications.
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Affiliation(s)
- Muhammad Asyraf Abduraman
- Advanced Medical & Dental Institute, SAINS@BERTAM, Universiti Sains Malaysia, 13200 Kepala Batas, Pulau Pinang, Malaysia
| | - Nurul Ain Azizan
- Advanced Medical & Dental Institute, SAINS@BERTAM, Universiti Sains Malaysia, 13200 Kepala Batas, Pulau Pinang, Malaysia; Center for Population Health, Dept. Social and Preventive Medicine, Faculty of Medicine, University Malaya, 50603 Kuala Lumpur, Malaysia
| | - Soo Huat Teoh
- Advanced Medical & Dental Institute, SAINS@BERTAM, Universiti Sains Malaysia, 13200 Kepala Batas, Pulau Pinang, Malaysia
| | - Mei Lan Tan
- Advanced Medical & Dental Institute, SAINS@BERTAM, Universiti Sains Malaysia, 13200 Kepala Batas, Pulau Pinang, Malaysia; School of Pharmaceutical Sciences, Universiti Sains Malaysia, 11800 Universiti Sains Malaysia, Pulau Pinang, Malaysia.
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24
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Abstract
PURPOSE OF REVIEW The micro/macrovascular complications of diabetes cause considerable morbidity and premature mortality. The SGLT2 inhibitors are the first diabetes medications with significant benefits on microvascular disease (nephropathy) and macrovascular cardiovascular disease. In this review, we evaluate one of the potential mechanisms for these cardiorenal benefits-the production of ketones, their benefits, and risks. RECENT FINDINGS In recent cardiovascular outcome trials (CVOTs), the SGLT2 inhibitors demonstrated significant cardiorenal benefits and they are now approved to reduce CV events/death, heart failure hospitalization, and progression to end-stage renal disease. Glucosuria induced by the SGLT2 inhibitors leads to increased ketone production. Ketones are an efficient fuel source and can improve myocardial and renal function. Further, the ketone body beta-hydroxybutyrate exhibits anti-inflammatory/anti-oxidative actions, which favorably impact myocardial and renal remodeling/fibrosis. Uncontrolled ketogenesis leads to ketoacidosis, especially during conditions of acute illness and excessive insulin dose reductions. The SGLT2 inhibitors have demonstrated significant cardiorenal benefits in large CVOTs. Studies are in progress to elucidate whether SGLT2 inhibitor-induced low-grade hyperketonemia contributes to these benefits.
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Affiliation(s)
- Preethika Ekanayake
- Veterans Affairs Medical Center, San Diego, CA, USA
- Department of Medicine, University of California at San Diego, San Diego School of Medicine, San Diego, USA
| | - Christopher Hupfeld
- Veterans Affairs Medical Center, San Diego, CA, USA
- Department of Medicine, University of California at San Diego, San Diego School of Medicine, San Diego, USA
| | - Sunder Mudaliar
- Veterans Affairs Medical Center, San Diego, CA, USA.
- Department of Medicine, University of California at San Diego, San Diego School of Medicine, San Diego, USA.
- Diabetes/Metabolism Section, VA San Diego HealthCare System, 3350 La Jolla Village Drive (Mail Code: 111G), San Diego, CA, 92161, USA.
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25
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De Bruyn A, Gunst J, Goossens C, Vander Perre S, Guerra GG, Verbruggen S, Joosten K, Langouche L, Van den Berghe G. Effect of withholding early parenteral nutrition in PICU on ketogenesis as potential mediator of its outcome benefit. Crit Care 2020; 24:536. [PMID: 32867803 PMCID: PMC7456767 DOI: 10.1186/s13054-020-03256-z] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 08/17/2020] [Indexed: 12/16/2022]
Abstract
Background In critically ill children, omitting early use of parenteral nutrition (late-PN versus early-PN) reduced infections, accelerated weaning from mechanical ventilation, and shortened PICU stay. We hypothesized that fasting-induced ketogenesis mediates these benefits. Methods In a secondary analysis of the PEPaNIC RCT (N = 1440), the impact of late-PN versus early-PN on plasma 3-hydroxybutyrate (3HB), and on blood glucose, plasma insulin, and glucagon as key ketogenesis regulators, was determined for 96 matched patients staying ≥ 5 days in PICU, and the day of maximal 3HB-effect, if any, was identified. Subsequently, in the total study population, plasma 3HB and late-PN-affected ketogenesis regulators were measured on that average day of maximal 3HB effect. Multivariable Cox proportional hazard and logistic regression analyses were performed adjusting for randomization and baseline risk factors. Whether any potential mediator role for 3HB was direct or indirect was assessed by further adjusting for ketogenesis regulators. Results In the matched cohort (n = 96), late-PN versus early-PN increased plasma 3HB throughout PICU days 1–5 (P < 0.0001), maximally on PICU day 2. Also, blood glucose (P < 0.001) and plasma insulin (P < 0.0001), but not glucagon, were affected. In the total cohort (n = 1142 with available plasma), late-PN increased plasma 3HB on PICU day 2 (day 1 for shorter stayers) from (median [IQR]) 0.04 [0.04–0.04] mmol/L to 0.75 [0.04–2.03] mmol/L (P < 0.0001). The 3HB effect of late-PN statistically explained its impact on weaning from mechanical ventilation (P = 0.0002) and on time to live PICU discharge (P = 0.004). Further adjustment for regulators of ketogenesis did not alter these findings. Conclusion Withholding early-PN in critically ill children significantly increased plasma 3HB, a direct effect that statistically mediated an important part of its outcome benefit.
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Affiliation(s)
- Astrid De Bruyn
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Jan Gunst
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Chloë Goossens
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Sarah Vander Perre
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Gonzalo G Guerra
- Department of Paediatrics, Intensive Care Unit, University of Alberta, Stollery Children's Hospital, Edmonton, AB, Canada
| | - Sascha Verbruggen
- Intensive Care Unit, Department of Paediatrics and Paediatric Surgery, Erasmus Medical Centre-Sophia Children's Hospital, Rotterdam, Netherlands
| | - Koen Joosten
- Intensive Care Unit, Department of Paediatrics and Paediatric Surgery, Erasmus Medical Centre-Sophia Children's Hospital, Rotterdam, Netherlands
| | - Lies Langouche
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium
| | - Greet Van den Berghe
- Clinical Division and Laboratory of Intensive Care Medicine, Department of Cellular and Molecular Medicine, KU Leuven, 3000, Leuven, Belgium.
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Abstract
Background 3-hydroxy-3-methylglutaryl-coenzyme A lyase deficiency (HMGCLD) is an autosomal recessive disorder of ketogenesis and leucine degradation due to mutations in HMGCL. Method We performed a systematic literature search to identify all published cases. Two hundred eleven patients of whom relevant clinical data were available were included in this analysis. Clinical course, biochemical findings and mutation data are highlighted and discussed. An overview on all published HMGCL variants is provided. Results More than 95% of patients presented with acute metabolic decompensation. Most patients manifested within the first year of life, 42.4% already neonatally. Very few individuals remained asymptomatic. The neurologic long-term outcome was favorable with 62.6% of patients showing normal development. Conclusion This comprehensive data analysis provides a systematic overview on all published cases with HMGCLD including a list of all known HMGCL mutations.
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Affiliation(s)
- Sarah C Grünert
- Department of General Pediatrics, Adolescent Medicine and Neonatology, Medical Center - University of Freiburg, Faculty of Medicine, Mathildenstr. 1, 79106, Freiburg, Germany.
| | - Jörn Oliver Sass
- Research Group Inborn Errors of Metabolism, Department of Natural Sciences & Institute for Functional Gene Analytics (IFGA), Bonn-Rhein-Sieg University of Applied Sciences, von-Liebig-Str. 20, 53359, Rheinbach, Germany.
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27
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Lucidi P, Porcellati F, Cioli P, Candeloro P, Marinelli Andreoli A, Bolli GB, Fanelli CG. Greater Suppression of Glucagon, Lipolysis, and Ketogenesis with Insulin Glargine U300 as Compared with Glargine U100 in Type 1 Diabetes Mellitus. Diabetes Technol Ther 2020; 22:57-61. [PMID: 31411498 DOI: 10.1089/dia.2019.0231] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The aim of this study was to establish the effects of clinical doses of Gla-300 versus Gla-100 on suppression of glucagon, lipolysis, and ketogenesis in type 1 diabetes mellitus (T1DM). Eighteen persons with T1DM (age 40 ± 12 years, diabetes duration 26 ± 12 years, body mass index 23.4 ± 2 kg/m2, A1C 7.19% ± 0.52% [55 ± 6 mmol/mol]) were studied after 3 months of titration with Gla-300 and Gla-100 (randomized, crossover design) with a 24-h euglycemic clamp (s.c. injection of individual insulin daily doses used by subjects for previous 2 weeks, Gla-300 0.35 ± 0.08 and Gla-100 0.28 ± 0.07 U/kg). Gla-300 resulted in (1) less increase in insulin concentration for 0-12 h, but greater insulin concentration in 12-24 h (no differences for 24 h); (2) greater glucagon suppression; (3) greater prehepatic insulin-to-glucagon molar ratio, primarily in 12-24 h (ratio 1.78, 90% confidence intervals [CIs] 1.5-2.1); and (4) lower 24-h free fatty acid (0.81; 90% CI 0.73-0.89), glycerol (0.78; 90% CI 0.65-0.94), and β-hydroxybutyrate (0.72; 90% CI 0.58-0.90). Over the 24 h postinjection, as compared with Gla-100, clinical doses of Gla-300 exhibit greater suppressive effects on glucagon, lipolysis, and ketogenesis, whereas the effects on glucose metabolism are equivalent.
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Affiliation(s)
- Paola Lucidi
- Section of Endocrinology & Metabolism, Department of Medicine, Perugia University School of Medicine, Perugia, Italy
| | - Francesca Porcellati
- Section of Endocrinology & Metabolism, Department of Medicine, Perugia University School of Medicine, Perugia, Italy
| | - Patrizia Cioli
- Section of Endocrinology & Metabolism, Department of Medicine, Perugia University School of Medicine, Perugia, Italy
| | - Paola Candeloro
- Section of Endocrinology & Metabolism, Department of Medicine, Perugia University School of Medicine, Perugia, Italy
| | - Anna Marinelli Andreoli
- Section of Endocrinology & Metabolism, Department of Medicine, Perugia University School of Medicine, Perugia, Italy
| | - Geremia B Bolli
- Section of Endocrinology & Metabolism, Department of Medicine, Perugia University School of Medicine, Perugia, Italy
| | - Carmine G Fanelli
- Section of Endocrinology & Metabolism, Department of Medicine, Perugia University School of Medicine, Perugia, Italy
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Liu H, Miao JK, Yu CW, Wan KX, Zhang J, Yuan ZJ, Yang J, Wang DJ, Zeng Y, Zou L. Severe clinical manifestation of mitochondrial 3-hydroxy-3-methylglutaryl-CoA synthase deficiency associated with two novel mutations: a case report. BMC Pediatr 2019; 19:344. [PMID: 31597564 DOI: 10.1186/s12887-019-1747-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 09/24/2019] [Indexed: 11/29/2022] Open
Abstract
Background Mitochondrial 3-hydroxy-3-methylglutaryl-CoA synthase (mHS) deficiency is an autosomal recessive inborn error of metabolism, which will give rise to failure of ketogenesis in liver during illness or fasting. It is a very rare disease with only a few patients reported worldwide, most of which had a good prognosis after proper therapies. Case presentation We report a 9-month-old boy with mHS deficiency presenting with unusually severe and persistent acidosis after diarrhea and reduced oral food intake. The metabolic acidosis persisted even after supplementation with sugar and alkaline solution. Blood purification and assisted respiration alleviated symptoms, but a second onset induced by respiratory infection several days later led to multiple organ failure and death. Urine organic acid analysis during the acute episode revealed a complex pattern of ketogenic dicarboxylic and 3-hydroxydicarboxylic aciduria with prominent elevation of glutaric acid and adipic acid, which seem to be specific to mHS deficiency. Plasma acylcarnitine analysis revealed elevated 3-hydroxybutyrylcarnitine and acetylcarnitine. This is the first report of elevated 3-hydroxybutyrylcarnitine in mHS deficiency. Whole exome sequencing revealed a novel compound heterozygous mutation in HMGCS2 (c.100C > T and c.1465delA). Conclusion This severe case suggests the need for patients with mHS deficiency to avoid recurrent illness because it can induce severe metabolic crisis, possibly leading to death. Such patients may also require special treatment, such as blood purification. Urine organic acid profile during the acute episode may give a hint to the disease.
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Goudarzi A. The recent insights into the function of ACAT1: A possible anti-cancer therapeutic target. Life Sci 2019; 232:116592. [PMID: 31228515 DOI: 10.1016/j.lfs.2019.116592] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2019] [Revised: 06/18/2019] [Accepted: 06/18/2019] [Indexed: 12/22/2022]
Abstract
Acetoacetyl-CoA thiolase also known as acetyl-CoA acetyltransferase (ACAT) corresponds to two enzymes, one cytosolic (ACAT2) and one mitochondrial (ACAT1), which is thought to catalyse reversible formation of acetoacetyl-CoA from two molecules of acetyl-CoA during ketogenesis and ketolysis respectively. In addition to this activity, ACAT1 is also involved in isoleucine degradation pathway. Deficiency of ACAT1 is an inherited metabolic disorder, which results from a defect in mitochondrial acetoacetyl-CoA thiolase activity and is clinically characterized with patients presenting ketoacidosis. In this review I discuss the recent findings, which unexpectedly expand the known functions of ACAT1, indicating a role for ACAT1 well beyond its classical activity. Indeed ACAT1 has recently been shown to possess an acetyltransferase activity capable of specifically acetylating Pyruvate DeHydrogenase (PDH), an enzyme involved in producing acetyl-CoA. ACAT1-dependent acetylation of PDH was shown to negatively regulate this enzyme with a consequence in Warburg effect and tumor growth. Finally, the elevated ACAT1 enzyme activity in diverse human cancer cell lines was recently reported. These important novel findings on ACAT1's function and expression in cancer cell proliferation point to ACAT1 as a potential new anti-cancer target.
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Affiliation(s)
- Afsaneh Goudarzi
- Department of Clinical Biochemistry, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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30
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Abstract
PURPOSE OF REVIEW The goal of this paper is to review current literature on nutritional ketosis within the context of weight management and metabolic syndrome, namely, insulin resistance, lipid profile, cardiovascular disease risk, and development of non-alcoholic fatty liver disease. We provide background on the mechanism of ketogenesis and describe nutritional ketosis. RECENT FINDINGS Nutritional ketosis has been found to improve metabolic and inflammatory markers, including lipids, HbA1c, high-sensitivity CRP, fasting insulin and glucose levels, and aid in weight management. We discuss these findings and elaborate on potential mechanisms of ketones for promoting weight loss, decreasing hunger, and increasing satiety. Humans have evolved with the capacity for metabolic flexibility and the ability to use ketones for fuel. During states of low dietary carbohydrate intake, insulin levels remain low and ketogenesis takes place. These conditions promote breakdown of excess fat stores, sparing of lean muscle, and improvement in insulin sensitivity.
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Affiliation(s)
- Victoria M Gershuni
- Department of Surgery, Hospital of the University of Pennsylvania, Philadelphia, PA, USA.
| | - Stephanie L Yan
- Department of Internal Medicine, University of California Davis, Davis, CA, USA
| | - Valentina Medici
- Division of Gastroenterology, University of California Davis, Davis, CA, USA
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31
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Di Lorenzo C, Coppola G, Bracaglia M, Di Lenola D, Sirianni G, Rossi P, Di Lorenzo G, Parisi V, Serrao M, Cervenka MC, Pierelli F. A ketogenic diet normalizes interictal cortical but not subcortical responsivity in migraineurs. BMC Neurol 2019; 19:136. [PMID: 31228957 PMCID: PMC6588932 DOI: 10.1186/s12883-019-1351-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 05/31/2019] [Indexed: 11/26/2022] Open
Abstract
Background A short ketogenic diet (KD) treatment can prevent migraine attacks and correct excessive cortical response. Here, we aim to prove if the KD-related changes of cortical excitability are primarily due to cerebral cortex activity or are modulated by the brainstem. Methods Through the stimulation of the right supraorbital division of the trigeminal nerve, we concurrently interictally recorded the nociceptive blink reflex (nBR) and the pain-related evoked potentials (PREP) in 18 migraineurs patients without aura before and after 1-month on KD, while in metabolic ketosis. nBR and PREP reflect distinct brain structures activation: the brainstem and the cerebral cortex respectively. We estimated nBR R2 component area-under-the-curve as well as PREP amplitude habituation as the slope pof the linear regression between the 1st and the 2nd block of 5 averaged responses. Results Following 1-month on KD, the mean number of attacks and headache duration reduced significantly. Moreover, KD significantly normalized the interictal PREP habituation (pre: + 1.8, post: − 9.1, p = 0.012), while nBR deficit of habituation did not change. Conclusions The positive clinical effects we observed in a population of migraineurs by a 1-month KD treatment coexists with a normalization at the cortical level, not in the brainstem, of the typical interictal deficit of habituation. These findings suggest that the cerebral cortex may be the primary site of KD-related modulation. Trial registration ClinicalTrials.gov NCT03775252 (retrospectively registered, December 09, 2018).
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Affiliation(s)
| | - Gianluca Coppola
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University Rof Rome Polo Pontino, Latina, Italy
| | - Martina Bracaglia
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University Rof Rome Polo Pontino, Latina, Italy
| | - Davide Di Lenola
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University Rof Rome Polo Pontino, Latina, Italy
| | | | - Paolo Rossi
- INI, Headache Clinic, Grottaferrata (RM), Italy
| | - Giorgio Di Lorenzo
- Laboratory of Psychophysiology, Department of Systems Medicine, University of Rome "Tor Vergata", Rome, Italy
| | - Vincenzo Parisi
- Research Unit of Neurophysiology of Vision and Neurophthalmology, IRCCS - Fondazione Bietti, Rome, Italy
| | - Mariano Serrao
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University Rof Rome Polo Pontino, Latina, Italy
| | - Mackenzie C Cervenka
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, USA
| | - Francesco Pierelli
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University Rof Rome Polo Pontino, Latina, Italy.,IRCCS - Neuromed, Pozzilli, IS, Italy
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Fogle KJ, Smith AR, Satterfield SL, Gutierrez AC, Hertzler JI, McCardell CS, Shon JH, Barile ZJ, Novak MO, Palladino MJ. Ketogenic and anaplerotic dietary modifications ameliorate seizure activity in Drosophila models of mitochondrial encephalomyopathy and glycolytic enzymopathy. Mol Genet Metab 2019; 126:439-447. [PMID: 30683556 PMCID: PMC6536302 DOI: 10.1016/j.ymgme.2019.01.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 01/14/2019] [Accepted: 01/15/2019] [Indexed: 12/13/2022]
Abstract
Seizures are a feature not only of the many forms of epilepsy, but also of global metabolic diseases such as mitochondrial encephalomyopathy (ME) and glycolytic enzymopathy (GE). Modern anti-epileptic drugs (AEDs) are successful in many cases, but some patients are refractory to existing AEDs, which has led to a surge in interest in clinically managed dietary therapy such as the ketogenic diet (KD). This high-fat, low-carbohydrate diet causes a cellular switch from glycolysis to fatty acid oxidation and ketone body generation, with a wide array of downstream effects at the genetic, protein, and metabolite level that may mediate seizure protection. We have recently shown that a Drosophila model of human ME (ATP61) responds robustly to the KD; here, we have investigated the mechanistic importance of the major metabolic consequences of the KD in the context of this bioenergetics disease: ketogenesis, reduction of glycolysis, and anaplerosis. We have found that reduction of glycolysis does not confer seizure protection, but that dietary supplementation with ketone bodies or the anaplerotic lipid triheptanoin, which directly replenishes the citric acid cycle, can mimic the success of the ketogenic diet even in the presence of standard carbohydrate levels. We have also shown that the proper functioning of the citric acid cycle is crucial to the success of the KD in the context of ME. Furthermore, our data reveal that multiple seizure models, in addition to ATP61, are treatable with the ketogenic diet. Importantly, one of these mutants is TPIsugarkill, which models human glycolytic enzymopathy, an incurable metabolic disorder with severe neurological consequences. Overall, these studies reveal widespread success of the KD in Drosophila, further cementing its status as an excellent model for studies of KD treatment and mechanism, and reveal key insights into the therapeutic potential of dietary therapy against neuronal hyperexcitability in epilepsy and metabolic disease.
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Affiliation(s)
- Keri J Fogle
- Department of Pharmacology & Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Pittsburgh Institute for Neurodegenerative Diseases (PIND), University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA.
| | - Amber R Smith
- Department of Pharmacology & Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Pittsburgh Institute for Neurodegenerative Diseases (PIND), University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Sidney L Satterfield
- Department of Pharmacology & Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Pittsburgh Institute for Neurodegenerative Diseases (PIND), University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Alejandra C Gutierrez
- Department of Pharmacology & Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Pittsburgh Institute for Neurodegenerative Diseases (PIND), University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - J Ian Hertzler
- Department of Pharmacology & Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Pittsburgh Institute for Neurodegenerative Diseases (PIND), University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Caleb S McCardell
- Department of Pharmacology & Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Pittsburgh Institute for Neurodegenerative Diseases (PIND), University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Joy H Shon
- Department of Pharmacology & Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Pittsburgh Institute for Neurodegenerative Diseases (PIND), University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Zackery J Barile
- Department of Pharmacology & Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Pittsburgh Institute for Neurodegenerative Diseases (PIND), University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Molly O Novak
- Department of Pharmacology & Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Pittsburgh Institute for Neurodegenerative Diseases (PIND), University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
| | - Michael J Palladino
- Department of Pharmacology & Chemical Biology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA; Pittsburgh Institute for Neurodegenerative Diseases (PIND), University of Pittsburgh School of Medicine, Pittsburgh, PA 15261, USA
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Siebel S, Galderisi A, Patel NS, Carria LR, Tamborlane WV, Sherr JL. Reversal of Ketosis in Type 1 Diabetes Is Not Adversely Affected by SGLT2 Inhibitor Therapy. Diabetes Technol Ther 2019; 21:101-104. [PMID: 30688521 PMCID: PMC6434586 DOI: 10.1089/dia.2018.0356] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
OBJECTIVE We have shown that "euglycemic DKA" in patients with type 1 diabetes receiving a sodium-glucose cotransporter 2-inhibitor (SGLT2i) is due to normal increases in rates of ketogenesis but blunted increases in plasma glucose levels. In this analysis, we assessed whether rescue treatment of early ketoacidosis with insulin is altered by SGLT2i use. RESEARCH DESIGN AND METHODS Participants received 0.2 U/kg of aspart insulin after two 6-h interruptions of basal insulin that increased beta-hydroxybutyrate (BHB) by 1.2 ± 0.7 mmol/L before and by 1.5 ± 0.2 mmol/L during canagliflozin treatment. BHB and free fatty acid (FFA) were monitored every 30 min for 120 min after receiving a 0.2 U/kg subcutaneous injection of aspart insulin. RESULTS Ten adults (23 ± 5 years) were studied. During the 120 min after rescue therapy with insulin, the reductions in BHB and FFA were nearly identical between the pre- and during canagliflozin treatment studies, respectively (-1.27 ± 0.76 and -1.13 ± 0.69, P = 0.671 for BHB and -0.50 ± 0.35 vs. -0.41 ± 0.41, P = 0.603 for FFA). CONCLUSION These data indicate that turning ketogenesis off, as well as on, does not appear to be affected by SGLT2i use.
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Affiliation(s)
- Stephan Siebel
- Pediatric Endocrinology, Yale School of Medicine, New Haven, Connecticut
| | - Alfonso Galderisi
- Pediatric Endocrinology, Yale School of Medicine, New Haven, Connecticut
- Department of Women and Children's Health, University of Padova, Padova, Italy
| | - Neha S. Patel
- Pediatric Endocrinology, Yale School of Medicine, New Haven, Connecticut
- Department of Pediatric Endocrinology and Diabetes, Penn State Health, Hershey, Pennsylvania
| | - Lori R. Carria
- Pediatric Endocrinology, Yale School of Medicine, New Haven, Connecticut
| | | | - Jennifer L. Sherr
- Pediatric Endocrinology, Yale School of Medicine, New Haven, Connecticut
- Address correspondence to: Jennifer L. Sherr, MD, PhD, Pediatric Endocrinology, Yale School of Medicine, Yale Pediatric Diabetes One Long Wharf Drive, Suite 503, New Haven, CT 06510
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Zhang M, Sun W, Qian J, Tang Y. Fasting exacerbates hepatic growth differentiation factor 15 to promote fatty acid β-oxidation and ketogenesis via activating XBP1 signaling in liver. Redox Biol 2018; 16:87-96. [PMID: 29482168 PMCID: PMC5952356 DOI: 10.1016/j.redox.2018.01.013] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 01/17/2018] [Accepted: 01/29/2018] [Indexed: 02/05/2023] Open
Abstract
Liver coordinates a series of metabolic adaptations to maintain systemic energy balance and provide adequate nutrients for critical organs, tissues and cells during starvation. However, the mediator(s) implicated in orchestrating these fasting-induced adaptive responses and the underlying molecular mechanisms are still obscure. Here we show that hepatic growth differentiation factor 15 (GDF15) is regulated by IRE1α-XBP1s branch and promotes hepatic fatty acids β-oxidation and ketogenesis upon fasting. GDF15 expression was exacerbated in liver of mice subjected to long-term fasted or ketogenic diet feeding. Abrogation of hepatic Gdf15 dramatically attenuated hepatic β-oxidation and ketogenesis in fasted mice or mice with STZ-initiated type I diabetes. Further study revealed that XBP1s activated Gdf15 transcription via binding to its promoter. Elevated GDF15 in liver reduced lipid accumulation and impaired NALFD development in obese mice through enhancing fatty acids oxidation in liver. Therefore, our results demonstrate a novel and critical role of hepatic GDF15 activated by IRE1α-XBP1s branch in regulating adaptive responses of liver upon starvation stress. GDF15 is augmented in livers of mice subjected to fasting or ketogenic diet feeding. XBP1s activates the transcription of Gdf15 via binding to its promoter. Abrogation of hepatic Gdf15 impairs fatty acid β-oxidation and ketogenesis. Inhibition of hepatic Gdf15 attenuates ketoacidosis of diabetic mice. Ectopic expression of hepatic GDF15 alleviates obese-induced NAFLD development.
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Affiliation(s)
- Meiyuan Zhang
- Emergency Intensive Care Unit, Qingpu Branch of Zhongshan Hospital, Fudan University, Shanghai 201700, China
| | - Weilan Sun
- Emergency Intensive Care Unit, Qingpu Branch of Zhongshan Hospital, Fudan University, Shanghai 201700, China
| | - Jin Qian
- Emergency Intensive Care Unit, Qingpu Branch of Zhongshan Hospital, Fudan University, Shanghai 201700, China
| | - Yan Tang
- Emergency Intensive Care Unit, Qingpu Branch of Zhongshan Hospital, Fudan University, Shanghai 201700, China.
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Shao X, Tang Y, Long H, Gu H, Zhang J, Deng P, Zhao Y, Cen X. HMG-CoA synthase 2 drives brain metabolic reprogramming in cocaine exposure. Neuropharmacology 2017; 148:377-393. [PMID: 28987936 DOI: 10.1016/j.neuropharm.2017.10.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Revised: 09/25/2017] [Accepted: 10/01/2017] [Indexed: 02/05/2023]
Abstract
The brain is a high energy-consuming organ that typically utilizes glucose as the main energy source for cerebral activity. When glucose becomes scarce under conditions of stress, ketone bodies, such as β-hydroxybutyrate, acetoacetate and acetone, become extremely important. Alterations in brain energy metabolism have been observed in psychostimulant abusers; however, the mode of brain metabolic programming in cocaine dependence remains largely unknown. Here, we profiled the metabolites and metabolic enzymes from brain nucleus accumbens (NAc) of mice exposed to cocaine. We found that cocaine modified energy metabolism and markedly activated ketogenesis pathway in the NAc. The expression of HMG-CoA synthase 2 (HMGCS2), a critical rate-limiting ketogenesis enzyme, was markedly up-regulated. After switching metabolic pathways from ketogenesis to glycolysis through activation of glucokinase, cocaine-evoked metabolic reprogramming regained homeostasis, and the cocaine effect was attenuated. Importantly, both the pharmacological and genetic inhibition of HMGCS2 significantly suppressed cocaine-induced ketogenesis and behavior. In conclusion, cocaine induces a remarkable energy reprogramming in the NAc, which is characterized by HMGCS2-driven ketogenesis. Such effect may facilitate adaptations to cocaine-induced energy stress in the brain. Our findings establish an important link between drug-induced energy reprogramming and cocaine effect, and may have implication in the treatment of cocaine addiction.
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Affiliation(s)
- Xue Shao
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Collaborative Innovation Center for Biotherapy, Chengdu 610041, PR China
| | - Yunxuan Tang
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Collaborative Innovation Center for Biotherapy, Chengdu 610041, PR China
| | - Hailei Long
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Collaborative Innovation Center for Biotherapy, Chengdu 610041, PR China
| | - Hui Gu
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Collaborative Innovation Center for Biotherapy, Chengdu 610041, PR China
| | - Jie Zhang
- Key Laboratory of Transplant Engineering and Immunology, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Pengchi Deng
- Analytical &Testing Center, Sichuan University, Chengdu 610041, China
| | - Yinglan Zhao
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Collaborative Innovation Center for Biotherapy, Chengdu 610041, PR China
| | - Xiaobo Cen
- National Chengdu Center for Safety Evaluation of Drugs, State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Collaborative Innovation Center for Biotherapy, Chengdu 610041, PR China.
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Ristic B, Bhutia YD, Ganapathy V. Cell-surface G-protein-coupled receptors for tumor-associated metabolites: A direct link to mitochondrial dysfunction in cancer. Biochim Biophys Acta Rev Cancer 2017; 1868:246-257. [PMID: 28512002 PMCID: PMC5997391 DOI: 10.1016/j.bbcan.2017.05.003] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Revised: 05/11/2017] [Accepted: 05/12/2017] [Indexed: 12/20/2022]
Abstract
Mitochondria are the sites of pyruvate oxidation, citric acid cycle, oxidative phosphorylation, ketogenesis, and fatty acid oxidation. Attenuation of mitochondrial function is one of the most significant changes that occurs in tumor cells, directly linked to oncogenesis, angiogenesis, Warburg effect, and epigenetics. In particular, three mitochondrial enzymes are inactivated in cancer: pyruvate dehydrogenase (PDH), succinate dehydrogenase (SDH), and 3-hydroxy-3-methylglutaryl CoA synthase-2 (HMGCS2). These enzymes are subject to regulation via acetylation/deacetylation. SIRT3, the predominant mitochondrial deacetylase, directly targets these enzymes for deacetylation and maintains their optimal catalytic activity. SIRT3 is a tumor suppressor, and deacetylation of these enzymes contributes to its biological function. PDH catalyzes the oxidative decarboxylation of pyruvate into acetyl CoA, SDH oxidizes succinate into fumarate, and HMGCS2 controls the synthesis of the ketone body β-hydroxybutyrate. As the activities of these enzymes are decreased in cancer, tumor cells accumulate lactate and succinate but produce less amounts of β-hydroxybutyrate. Apart from their role in cellular energetics, these metabolites function as signaling molecules via specific cell-surface G-protein-coupled receptors. Lactate signals via GPR81, succinate via GPR91, and β-hydroxybutyrate via GPR109A. In addition, lactate activates hypoxia-inducible factor HIF1α and succinate promotes DNA methylation. GPR81 and GPR91 are tumor promoters, and increased production of lactate and succinate as their agonists drives tumorigenesis by enhancing signaling via these two receptors. In contrast, GPR109A is a tumor suppressor, and decreased synthesis of β-hydroxybutyrate as its agonist suppresses signaling via this receptor, thus attenuating the tumor-suppressing function of GPR109A. In parallel with the opposing changes in lactate/succinate and β-hydroxybutyrate levels, tumor cells upregulate GPR81 and GPR91 but downregulate GPR109A. As such, these three metabolite receptors play a critical role in cancer and represent a new class of drug targets with selective antagonists of GPR81 and GPR91 for cancer treatment and agonists of GPR109A for cancer prevention.
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Affiliation(s)
- Bojana Ristic
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
| | - Yangzom D Bhutia
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
| | - Vadivel Ganapathy
- Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA.
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Grünert SC, Schlatter SM, Schmitt RN, Gemperle-Britschgi C, Mrázová L, Balcı MC, Bischof F, Çoker M, Das AM, Demirkol M, de Vries M, Gökçay G, Häberle J, Uçar SK, Lotz-Havla AS, Lücke T, Roland D, Rutsch F, Santer R, Schlune A, Staufner C, Schwab KO, Mitchell GA, Sass JO. 3-Hydroxy-3-methylglutaryl-coenzyme A lyase deficiency: Clinical presentation and outcome in a series of 37 patients. Mol Genet Metab 2017; 121:206-215. [PMID: 28583327 DOI: 10.1016/j.ymgme.2017.05.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 05/20/2017] [Indexed: 11/28/2022]
Abstract
3-Hydroxy-3-methylglutaryl-coenzyme A lyase deficiency (HMGCLD) is a rare inborn error of ketone body synthesis and leucine degradation, caused by mutations in the HMGCL gene. In order to obtain a comprehensive view on this disease, we have collected clinical and biochemical data as well as information on HMGCL mutations of 37 patients (35 families) from metabolic centers in Belgium, Germany, The Netherlands, Switzerland, and Turkey. All patients were symptomatic at some stage with 94% presenting with an acute metabolic decompensation. In 50% of the patients, the disorder manifested neonatally, mostly within the first days of life. Only 8% of patients presented after one year of age. Six patients died prior to data collection. Long-term neurological complications were common. Half of the patients had a normal cognitive development while the remainder showed psychomotor deficits. We identified seven novel HMGCL mutations. In agreement with previous reports, no clear genotype-phenotype correlation could be found. This is the largest cohort of HMGCLD patients reported so far, demonstrating that HMGCLD is a potentially life-threatening disease with variable clinical outcome. Our findings suggest that the clinical course of HMGCLD cannot be predicted accurately from HMGCL genotype. The overall outcome in HMGCLD appears limited, thus rendering early diagnosis and strict avoidance of metabolic crises important.
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Affiliation(s)
- Sarah Catharina Grünert
- Department of General Pediatrics, Adolescent Medicine and Neonatology, Medical Center - University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Sonja Marina Schlatter
- Department of General Pediatrics, Adolescent Medicine and Neonatology, Medical Center - University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Robert Niklas Schmitt
- Department of General Pediatrics, Adolescent Medicine and Neonatology, Medical Center - University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Corinne Gemperle-Britschgi
- Division of Clinical Chemistry & Biochemistry and Children's Research Center, University Children's Hospital, Zürich, Switzerland
| | - Lenka Mrázová
- Institute of Inherited Metabolic Disorders, Charles University in Prague - 1st Faculty of Medicine and General University Hospital in Prague, Prague, Czech Republic
| | - Mehmet Cihan Balcı
- Division of Pediatric Nutrition and Metabolism, Department of Pediatrics, Istanbul Medical Faculty, Istanbul, Turkey
| | - Felix Bischof
- Department of Neurology, University of Tübingen, Germany
| | - Mahmut Çoker
- Division of Metabolism and Nutrition, Department of Pediatrics, Faculty of Medicine, Ege University, Izmir, Turkey
| | - Anibh M Das
- Department of Pediatrics, Hannover Medical School, Hannover, Germany
| | - Mübeccel Demirkol
- Division of Pediatric Nutrition and Metabolism, Department of Pediatrics, Istanbul Medical Faculty, Istanbul, Turkey
| | - Maaike de Vries
- Radboud University Medical Center, Nijmegen, The Netherlands
| | - Gülden Gökçay
- Division of Pediatric Nutrition and Metabolism, Department of Pediatrics, Istanbul Medical Faculty, Istanbul, Turkey
| | - Johannes Häberle
- Division of Metabolism and Children's Research Center, University Children's Hospital, Zürich, Switzerland
| | - Sema Kalkan Uçar
- Division of Metabolism and Nutrition, Department of Pediatrics, Faculty of Medicine, Ege University, Izmir, Turkey
| | - Amelie Sophia Lotz-Havla
- Department of Inborn Errors of Metabolism, Dr. von Hauner Children's Hospital, Ludwig-Maximilians University, Munich, Germany
| | - Thomas Lücke
- Department of Neuropediatrics, University Children's Hospital, Ruhr-University Bochum, Bochum, Germany
| | - Dominique Roland
- Inborn Errors of Metabolism Unit, Institute of Pathology and Genetics, Charleroi, Gosselies, Belgium
| | - Frank Rutsch
- Department of General Pediatrics, Münster University Children's Hospital, Münster, Germany
| | - René Santer
- Department of Pediatrics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Andrea Schlune
- Department of General Pediatrics, Neonatology and Pediatric Cardiology, University Children's Hospital, Heinrich Heine University, Düsseldorf, Germany
| | - Christian Staufner
- Department of General Pediatrics, Division of Neuropediatrics and Pediatric Metabolic Medicine, University Hospital Heidelberg, Heidelberg, Germany
| | - Karl Otfried Schwab
- Department of General Pediatrics, Adolescent Medicine and Neonatology, Medical Center - University of Freiburg, Faculty of Medicine, Freiburg, Germany
| | - Grant A Mitchell
- Centre de Recherche and Département de Pédiatrie, CHU Sainte-Justine, Université de Montréal, Montréal, Québec, Canada; Département de Biochimie, Université de Montréal, Montréal, Québec, Canada
| | - Jörn Oliver Sass
- Department of General Pediatrics, Adolescent Medicine and Neonatology, Medical Center - University of Freiburg, Faculty of Medicine, Freiburg, Germany; Division of Clinical Chemistry & Biochemistry and Children's Research Center, University Children's Hospital, Zürich, Switzerland; Bioanalytics & Biochemistry, Department of Natural Sciences, University of Applied Sciences, Rheinbach, Germany.
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Vu LT, Orbach SM, Ray WK, Cassin ME, Rajagopalan P, Helm RF. The hepatocyte proteome in organotypic rat liver models and the influence of the local microenvironment. Proteome Sci 2017; 15:12. [PMID: 28649179 PMCID: PMC5480101 DOI: 10.1186/s12953-017-0120-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Accepted: 06/15/2017] [Indexed: 12/15/2022] Open
Abstract
BACKGROUND Liver models that closely mimic the in vivo microenvironment are useful for understanding liver functions, capabilities, and intercellular communication processes. Three-dimensional (3D) liver models assembled using hepatocytes and liver sinusoidal endothelial cells (LSECs) separated by a polyelectrolyte multilayer (PEM) provide a functional system while also permitting isolation of individual cell types for proteomic analyses. METHODS To better understand the mechanisms and processes that underlie liver model function, hepatocytes were maintained as monolayers and 3D PEM-based formats in the presence or absence of primary LSECs. The resulting hepatocyte proteomes, the proteins in the PEM, and extracellular levels of urea, albumin and glucose after three days of culture were compared. RESULTS All systems were ketogenic and found to release glucose. The presence of the PEM led to increases in proteins associated with both mitochondrial and peroxisomal-based β-oxidation. The PEMs also limited production of structural and migratory proteins associated with dedifferentiation. The presence of LSECs increased levels of Phase I and Phase II biotransformation enzymes as well as several proteins associated with the endoplasmic reticulum and extracellular matrix remodeling. The proteomic analysis of the PEMs indicated that there was no significant change after three days of culture. These results are discussed in relation to liver model function. CONCLUSIONS Heterotypic cell-cell and cell-ECM interactions exert different effects on hepatocyte functions and phenotypes.
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Affiliation(s)
- Lucas T. Vu
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061 USA
| | - Sophia M. Orbach
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061 USA
| | - W. Keith Ray
- Department of Biochemistry, Virginia Tech, Blacksburg, Virginia 24061 USA
| | - Margaret E. Cassin
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061 USA
| | - Padmavathy Rajagopalan
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061 USA
- School of Biomedical Engineering and Sciences, Virginia Tech, Blacksburg, Virginia 24061 USA
- ICTAS Center for Systems Biology and Engineered Tissues, Virginia Tech, Blacksburg, Virginia 24061 USA
| | - Richard F. Helm
- Department of Biochemistry, Virginia Tech, Blacksburg, Virginia 24061 USA
- ICTAS Center for Systems Biology and Engineered Tissues, Virginia Tech, Blacksburg, Virginia 24061 USA
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Kruljac I, Ćaćić M, Ćaćić P, Ostojić V, Štefanović M, Šikić A, Vrkljan M. Diabetic ketosis during hyperglycemic crisis is associated with decreased all-cause mortality in patients with type 2 diabetes mellitus. Endocrine 2017; 55:139-143. [PMID: 27592119 DOI: 10.1007/s12020-016-1082-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2016] [Accepted: 08/08/2016] [Indexed: 11/27/2022]
Abstract
Patients with type 2 diabetes mellitus have impaired ketogenesis due to high serum insulin and low growth hormone levels. Evidence exists that ketone bodies might improve kidney and cardiac function. In theory, improved ketogenesis in diabetics may have positive effects. We aimed to assess the impact of diabetic ketosis on all-cause mortality in patients with type 2 diabetes mellitus presenting with hyperglycemic crisis. We analyzed 486 patients with diabetic ketosis and 486 age and sex-matched patients with non-ketotic hyperglycemia presenting to the emergency department. Cox proportional hazard models were used to analyze the link between patient characteristics and mortality. During an observation time of 33.4 months, death of any cause occurred in 40.9 % of the non-ketotic hyperglycemia group and 30.2 % of the DK group (hazard ratio in the diabetic ketosis group, 0.63; 95 % confidence interval 0.48-0.82; P = 0.0005). Patients with diabetic ketosis had a lower incidence of symptomatic heart failure and had improved renal function. They used less furosemide and antihypertensive drugs, more metformin and lower insulin doses, all of which was independently associated with decreased mortality. Plasma glucose and glycated hemoglobin levels were similar in both groups. Patients with hyperglycemic crisis and diabetic ketosis have decreased all-cause mortality when compared to those with non-ketotic hyperglycemia. diabetic ketosis might be a compensatory mechanism rather than a complication in patients with hyperglycemic crises, but further prospective studies are warranted.
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Affiliation(s)
- Ivan Kruljac
- Department of Endocrinology, Diabetes and Metabolic Diseases "Mladen Sekso", University Hospital Center "Sestre Milosrdnice", University of Zagreb School of Medicine, Vinogradska cesta 29, Zagreb, 10000, Croatia.
| | - Miroslav Ćaćić
- Department of Endocrinology, Diabetes and Metabolic Diseases "Mladen Sekso", University Hospital Center "Sestre Milosrdnice", University of Zagreb School of Medicine, Vinogradska cesta 29, Zagreb, 10000, Croatia
| | - Petra Ćaćić
- University of Zagreb School of Medicine, Zagreb, Croatia
| | - Vedran Ostojić
- Department of Internal Medicine, University Hospital "Sveti Duh", Zagreb, Croatia
| | - Mario Štefanović
- Clinical Institute of Chemistry, University Hospital Center "Sestre Milosrdnice", University of Zagreb Faculty of Pharmacy and Biochemistry, Zagreb, Croatia
| | - Aljoša Šikić
- Department of Emergency Medicine, University Hospital Center "Sestre Milosrdnice", Zagreb, Croatia
| | - Milan Vrkljan
- Department of Endocrinology, Diabetes and Metabolic Diseases "Mladen Sekso", University Hospital Center "Sestre Milosrdnice", University of Zagreb School of Medicine, Vinogradska cesta 29, Zagreb, 10000, Croatia
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Geisler CE, Hepler C, Higgins MR, Renquist BJ. Hepatic adaptations to maintain metabolic homeostasis in response to fasting and refeeding in mice. Nutr Metab (Lond) 2016; 13:62. [PMID: 27708682 PMCID: PMC5037643 DOI: 10.1186/s12986-016-0122-x] [Citation(s) in RCA: 79] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2016] [Accepted: 09/15/2016] [Indexed: 12/26/2022] Open
Abstract
Background The increased incidence of obesity and associated metabolic diseases has driven research focused on genetically or pharmacologically alleviating metabolic dysfunction. These studies employ a range of fasting-refeeding models including 4–24 h fasts, “overnight” fasts, or meal feeding. Still, we lack literature that describes the physiologically relevant adaptations that accompany changes in the duration of fasting and re-feeding. Since the liver is central to whole body metabolic homeostasis, we investigated the timing of the fast-induced shift toward glycogenolysis, gluconeogenesis, and ketogenesis and the meal-induced switch toward glycogenesis and away from ketogenesis. Methods Twelve to fourteen week old male C57BL/6J mice were fasted for 0, 4, 8, 12, or 16 h and sacrificed 4 h after lights on. In a second study, designed to understand the response to a meal, we gave fasted mice access to feed for 1 or 2 h before sacrifice. We analyzed the data using mixed model analysis of variance. Results Fasting initiated robust metabolic shifts, evidenced by changes in serum glucose, non-esterified fatty acids (NEFAs), triacylglycerol, and β-OH butyrate, as well as, liver triacylglycerol, non-esterified fatty acid, and glycogen content. Glycogenolysis is the primary source to maintain serum glucose during the first 8 h of fasting, while de novo gluconeogenesis is the primary source thereafter. The increase in serum β-OH butyrate results from increased enzymatic capacity for fatty acid flux through β-oxidation and shunting of acetyl-CoA toward ketone body synthesis (increased CPT1 (Carnitine Palmitoyltransferase 1) and HMGCS2 (3-Hydroxy-3-Methylglutaryl-CoA Synthase 2) expression, respectively). In opposition to the relatively slow metabolic adaptation to fasting, feeding of a meal results in rapid metabolic changes including full depression of serum β-OH butyrate and NEFAs within an hour. Conclusions Herein, we provide a detailed description of timing of the metabolic adaptations in response to fasting and re-feeding to inform study design in experiments of metabolic homeostasis. Since fasting and obesity are both characterized by elevated adipose tissue lipolysis, hepatic lipid accumulation, ketogenesis, and gluconeogenesis, understanding the drivers behind the metabolic shift from the fasted to the fed state may provide targets to limit aberrant gluconeogenesis and ketogenesis in obesity.
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Affiliation(s)
- C E Geisler
- School of Animal and Comparative Biomedical Sciences, University of Arizona, 4101 North Campbell Avenue, Tucson, AZ 85719 USA
| | - C Hepler
- School of Animal and Comparative Biomedical Sciences, University of Arizona, 4101 North Campbell Avenue, Tucson, AZ 85719 USA.,Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75235 USA
| | - M R Higgins
- School of Animal and Comparative Biomedical Sciences, University of Arizona, 4101 North Campbell Avenue, Tucson, AZ 85719 USA
| | - B J Renquist
- School of Animal and Comparative Biomedical Sciences, University of Arizona, 4101 North Campbell Avenue, Tucson, AZ 85719 USA
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Di Lorenzo C, Coppola G, Bracaglia M, Di Lenola D, Evangelista M, Sirianni G, Rossi P, Di Lorenzo G, Serrao M, Parisi V, Pierelli F. Cortical functional correlates of responsiveness to short-lasting preventive intervention with ketogenic diet in migraine: a multimodal evoked potentials study. J Headache Pain 2016; 17:58. [PMID: 27245682 PMCID: PMC4887398 DOI: 10.1186/s10194-016-0650-9] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 05/27/2016] [Indexed: 01/06/2023] Open
Abstract
BACKGROUND Here, we aim to identify cortical electrofunctional correlates of responsiveness to short-lasting preventiveintervention with ketogenic diet (KD) in migraine. METHODS Eighteen interictal migraineurs underwent visual (VEPs) and median nerve somatosensory (SSEPs) evokedpotentials before and after 1 month of KD during ketogenesis. We measured VEPs N1-P1 and SSEPs N20-P25 amplitudes respectively in six and in two sequential blocks of 100 sweeps as well as habituation as theslope of the linear regression between block 1 to 6 for VEPs or between 1 to 2 for SSEPs. RESULTS After 1-month of KD, a significant reduction in the mean attack frequency and duration was observed (all P< 0.001). The KD did not change the 1st SSEP and VEP block of responses, but significantly inducednormalization of the interictally reduced VEPs and SSEPs (all p < 0.01) habituation during the subsequentblocks. CONCLUSIONS KD could restore normal EPs habituation curves during stimulus repetition without significantly changing theearly amplitude responses. Thus, we hypothesize that KD acts on habituation regulating the balancebetween excitation and inhibition at the cortical level.
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Affiliation(s)
| | - Gianluca Coppola
- Department of Neurophysiology of Vision and Neurophthalmology, G. B. Bietti Foundation-IRCCS, Rome, Italy
| | - Martina Bracaglia
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University of Rome Polo Pontino, Latina, Italy
| | - Davide Di Lenola
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University of Rome Polo Pontino, Latina, Italy
| | - Maurizio Evangelista
- Istituto di Anestesiologia, Rianimazione e Terapia del Dolore, Università Cattolica del Sacro Cuore/CIC, Rome, Italy
| | - Giulio Sirianni
- Delle Medical Center, Wellness and Dietary Medicine, Rome, Italy
| | - Paolo Rossi
- INI, Headache Clinic, Grottaferrata, (RM), Italy
| | - Giorgio Di Lorenzo
- Department of Systems Medicine, University of Rome "Tor Vergata", Laboratory of Psychophysiology, Rome, Italy
| | - Mariano Serrao
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University of Rome Polo Pontino, Latina, Italy
| | - Vincenzo Parisi
- Department of Neurophysiology of Vision and Neurophthalmology, G. B. Bietti Foundation-IRCCS, Rome, Italy
| | - Francesco Pierelli
- Department of Medico-Surgical Sciences and Biotechnologies, "Sapienza" University of Rome Polo Pontino, Latina, Italy.,INM Neuromed IRCCS, Pozzilli, (IS), Italy
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Hennebelle M, Courchesne-Loyer A, St-Pierre V, Vandenberghe C, Castellano CA, Fortier M, Tessier D, Cunnane SC. Preliminary evaluation of a differential effect of an α-linolenate-rich supplement on ketogenesis and plasma ω-3 fatty acids in young and older adults. Nutrition 2016; 32:1211-6. [PMID: 27261061 DOI: 10.1016/j.nut.2016.03.025] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Revised: 03/14/2016] [Accepted: 03/24/2016] [Indexed: 01/09/2023]
Abstract
OBJECTIVES The aim of the present study was to compare the effects of an α-linolenic acid-rich supplement (ALA-RS) on the ketogenic response and plasma long-chain ω-3 polyunsaturated fatty acid in healthy young adults and older individuals. METHODS Ten young (25 ± 0.9 y) and 10 older adults (73.1 ± 2.2 y) consumed a flaxseed oil supplement providing 2 g/d of ALA for 4 wk. Plasma ketones, nonesterified fatty acids (NEFA), triacylglycerols, glucose, and insulin were measured over 6 h, before and after supplementation. Total body fat mass was assessed before and after the ALA-RS. RESULTS The ALA-RS did not significantly modify fasting ketones but postprandial production of β-hydroxybutyrate was increased by 26% (P = 0.037) only in the young adult group. Fasting plasma ketones were positively correlated to fasting plasma NEFA (P < 0.01) in both groups. However, the relation was shifted to the right in the older group, suggesting that older adults needed higher plasma NEFA levels to achieve the same ketone amounts as young adults. At baseline, the older group had 47% higher total plasma fatty acids than the young group (P = 0.007). After the ALA-RS, plasma ALA doubled in both groups (P < 0.01), an effect that was associated in the older group with a 40% higher eicosapentaenoic acid (EPA; P = 0.004), but no difference in docosahexaenoic acid. The postsupplementation increase in plasma ALA correlated positively with percent total body fat, especially in the older group (r(2) = 0.77; P = 0.0016). CONCLUSION In young adults, ALA-RS mildly stimulated postprandial ketogenesis, whereas in the older group, it favored increased plasma ALA and EPA.
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Ciavardelli D, Piras F, Consalvo A, Rossi C, Zucchelli M, Di Ilio C, Frazzini V, Caltagirone C, Spalletta G, Sensi SL. Medium-chain plasma acylcarnitines, ketone levels, cognition, and gray matter volumes in healthy elderly, mildly cognitively impaired, or Alzheimer's disease subjects. Neurobiol Aging 2016; 43:1-12. [PMID: 27255810 DOI: 10.1016/j.neurobiolaging.2016.03.005] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 02/02/2016] [Accepted: 03/06/2016] [Indexed: 12/21/2022]
Abstract
Aging, amyloid deposition, and tau-related pathology are key contributors to the onset and progression of Alzheimer's disease (AD). However, AD is also associated with brain hypometabolism and deficits of mitochondrial bioenergetics. Plasma acylcarnitines (ACCs) are indirect indices of altered fatty acid beta-oxidation, and ketogenesis has been found to be decreased on aging. Furthermore, in elderly subjects, alterations in plasma levels of specific ACCs have been suggested to predict conversion to mild cognitive impairment (MCI) or AD. In this study, we assayed plasma profiles of ACCs in a cohort of healthy elderly control, MCI subjects, and AD patients. Compared with healthy controls or MCI subjects, AD patients showed significant lower plasma levels of several medium-chain ACCs. Furthermore, in AD patients, these lower concentrations were associated with lower prefrontal gray matter volumes and the presence of cognitive impairment. Interestingly, lower levels of medium-chain ACCs were also found to be associated with lower plasma levels of 2-hydroxybutyric acid. Overall, these findings suggest that altered metabolism of medium-chain ACCs and impaired ketogenesis can be metabolic features of AD.
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Affiliation(s)
- Domenico Ciavardelli
- School of Human and Social Science, "Kore" University of Enna, Enna, Italy; Molecular Neurology Unit, Center of Excellence on Aging and Translational Medicine (Ce.S.I.-MeT), "G. d'Annunzio" University of Chieti-Pescara, Chieti, Italy
| | - Fabrizio Piras
- Department of Clinical and Behavioral Neurology, Neuropsychiatry Laboratory, IRCCS Santa Lucia Foundation, Rome, Italy; "Enrico Fermi" Centre for Study and Research, Rome, Italy
| | - Ada Consalvo
- Department of Medical, Oral, and Biotechnological Sciences, ''G. d'Annunzio'' University of Chieti-Pescara, Chieti, Italy
| | - Claudia Rossi
- Department of Medical, Oral, and Biotechnological Sciences, ''G. d'Annunzio'' University of Chieti-Pescara, Chieti, Italy
| | - Mirco Zucchelli
- Department of Medical, Oral, and Biotechnological Sciences, ''G. d'Annunzio'' University of Chieti-Pescara, Chieti, Italy
| | - Carmine Di Ilio
- Department of Medical, Oral, and Biotechnological Sciences, ''G. d'Annunzio'' University of Chieti-Pescara, Chieti, Italy
| | - Valerio Frazzini
- Molecular Neurology Unit, Center of Excellence on Aging and Translational Medicine (Ce.S.I.-MeT), "G. d'Annunzio" University of Chieti-Pescara, Chieti, Italy
| | - Carlo Caltagirone
- Department of Clinical and Behavioral Neurology, Neuropsychiatry Laboratory, IRCCS Santa Lucia Foundation, Rome, Italy; Department of Neuroscience, University "Tor Vergata", Rome, Italy
| | - Gianfranco Spalletta
- Department of Clinical and Behavioral Neurology, Neuropsychiatry Laboratory, IRCCS Santa Lucia Foundation, Rome, Italy
| | - Stefano L Sensi
- Molecular Neurology Unit, Center of Excellence on Aging and Translational Medicine (Ce.S.I.-MeT), "G. d'Annunzio" University of Chieti-Pescara, Chieti, Italy; Department of Neurology, and Institute for Memory Impairments and Neurological Disorders, University of California-Irvine, Irvine, CA, USA; Department of Pharmacology, and Institute for Memory Impairments and Neurological Disorders, University of California-Irvine, Irvine, CA, USA.
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Kanda T, Tsujino N, Kuramoto E, Koyama Y, Susaki EA, Chikahisa S, Funato H. Sleep as a biological problem: an overview of frontiers in sleep research. J Physiol Sci 2016; 66:1-13. [PMID: 26541158 DOI: 10.1007/s12576-015-0414-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Accepted: 09/30/2015] [Indexed: 12/14/2022]
Abstract
Sleep is a physiological process not only for the rest of the body but also for several brain functions such as mood, memory, and consciousness. Nevertheless, the nature and functions of sleep remain largely unknown due to its extremely complicated nature and lack of optimized technology for the experiments. Here we review the recent progress in the biology of the mammalian sleep, which covers a wide range of research areas: the basic knowledge about sleep, the physiology of cerebral cortex in sleeping animals, the detailed morphological features of thalamocortical networks, the mechanisms underlying fluctuating activity of autonomic nervous systems during rapid eye movement sleep, the cutting-edge technology of tissue clearing for visualization of the whole brain, the ketogenesis-mediated homeostatic regulation of sleep, and the forward genetic approach for identification of novel genes involved in sleep. We hope this multifaceted review will be helpful for researchers who are interested in the biology of sleep.
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Abstract
The accelerated metabolic demands of the working muscle cannot be met without a robust response from the liver. If not for the hepatic response, sustained exercise would be impossible. The liver stores, releases, and recycles potential energy. Exercise would result in hypoglycemia if it were not for the accelerated release of energy as glucose. The energetic demands on the liver are largely met by increased oxidation of fatty acids mobilized from adipose tissue. Adaptations immediately following exercise facilitate the replenishment of glycogen stores. Pancreatic glucagon and insulin responses orchestrate the hepatic response during and immediately following exercise. Like skeletal muscle and other physiological systems, liver adapts to repeated demands of exercise by increasing its capacity to produce energy by oxidizing fat. The ability of regular physical activity to increase fat oxidation is protective and can reverse fatty liver disease. Engaging in regular physical exercise has broad ranging positive health implications including those that improve the metabolic health of the liver.
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Affiliation(s)
- Elijah Trefts
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - Ashley S Williams
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
| | - David H Wasserman
- Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee, USA.
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Douris N, Melman T, Pecherer JM, Pissios P, Flier JS, Cantley LC, Locasale JW, Maratos-Flier E. Adaptive changes in amino acid metabolism permit normal longevity in mice consuming a low-carbohydrate ketogenic diet. Biochim Biophys Acta Mol Basis Dis 2015; 1852:2056-65. [PMID: 26170063 DOI: 10.1016/j.bbadis.2015.07.009] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Revised: 06/30/2015] [Accepted: 07/07/2015] [Indexed: 10/23/2022]
Abstract
Ingestion of very low-carbohydrate ketogenic diets (KD) is associated with weight loss, lowering of glucose and insulin levels and improved systemic insulin sensitivity. However, the beneficial effects of long-term feeding have been the subject of debate. We therefore studied the effects of lifelong consumption of this diet in mice. Complete metabolic analyses were performed after 8 and 80weeks on the diet. In addition we performed a serum metabolomic analysis and examined hepatic gene expression. Lifelong consumption of KD had no effect on morbidity or mortality (KD vs. Chow, 676 vs. 630days) despite hepatic steatosis and inflammation in KD mice. The KD fed mice lost weight initially as previously reported (Kennnedy et al., 2007) and remained lighter and had less fat mass; KD consuming mice had higher levels of energy expenditure, improved glucose homeostasis and higher circulating levels of β-hydroxybutyrate and triglycerides than chow-fed controls. Hepatic expression of the critical metabolic regulators including fibroblast growth factor 21 were also higher in KD-fed mice while expression levels of lipogenic enzymes such as stearoyl-CoA desaturase-1 was reduced. Metabolomic analysis revealed compensatory changes in amino acid metabolism, primarily involving down-regulation of catabolic processes, demonstrating that mice eating KD can shift amino acid metabolism to conserve amino acid levels. Long-term KD feeding caused profound and persistent metabolic changes, the majority of which are seen as health promoting, and had no adverse effects on survival in mice.
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Affiliation(s)
- Nicholas Douris
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Tamar Melman
- Division of Signal Transduction, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA
| | - Jordan M Pecherer
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Pavlos Pissios
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Jeffrey S Flier
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA
| | - Lewis C Cantley
- Division of Signal Transduction, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA; Department of Medicine, Weill Cornell Medical College, New York, NY 10065, USA
| | - Jason W Locasale
- Division of Signal Transduction, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02115, USA; Division of Nutritional Sciences, Cornell University, Ithaca, NY 14850, USA
| | - Eleftheria Maratos-Flier
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA 02215, USA.
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Wu W, Tsuchida H, Kato T, Niwa H, Horikawa Y, Takeda J, Iizuka K. Fat and carbohydrate in western diet contribute differently to hepatic lipid accumulation. Biochem Biophys Res Commun 2015; 461:681-6. [PMID: 25931000 DOI: 10.1016/j.bbrc.2015.04.092] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Accepted: 04/19/2015] [Indexed: 01/16/2023]
Abstract
We investigated the contributions of dietary fat and dietary carbohydrate to the development of fatty liver induced by western diet (WD). Compared with WD-fed wild type (WT) mice, livers of WD-fed ChREBP(-/-) mice showed lipid droplets of varying sizes around the hepatic lobules, while hepatic triglyceride and cholesterol contents were only modestly decreased. Inflammation and fibrosis were suppressed in ChREBP(-/-) mice. In addition, compared with WD-fed WT mice, ChREBP(-/-) mice showed decreased β-oxidation, ketogenesis and FGF21 production, increased intestinal lipid absorption, and decreased VLDL secretion. These findings suggest that dietary fat and carbohydrate contribute differently to the development of fatty liver.
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Affiliation(s)
- Wudelehu Wu
- Department of Diabetes and Endocrinology, Graduate School of Medicine, Gifu University, Gifu 501-1194, Japan
| | - Hiromi Tsuchida
- Department of Diabetes and Endocrinology, Graduate School of Medicine, Gifu University, Gifu 501-1194, Japan
| | - Takehiro Kato
- Department of Diabetes and Endocrinology, Graduate School of Medicine, Gifu University, Gifu 501-1194, Japan; Matsunami General Hospital, Gifu 501-6062, Japan
| | - Horoyuki Niwa
- Department of Diabetes and Endocrinology, Graduate School of Medicine, Gifu University, Gifu 501-1194, Japan
| | - Yukio Horikawa
- Department of Diabetes and Endocrinology, Graduate School of Medicine, Gifu University, Gifu 501-1194, Japan
| | - Jun Takeda
- Department of Diabetes and Endocrinology, Graduate School of Medicine, Gifu University, Gifu 501-1194, Japan
| | - Katsumi Iizuka
- Department of Diabetes and Endocrinology, Graduate School of Medicine, Gifu University, Gifu 501-1194, Japan; Gifu University Hospital Center for Nutritional Support and Infection Control, Gifu 501-1194, Japan.
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Oishi K, Yamamoto S, Uchida D, Doi R. Ketogenic diet and fasting induce the expression of cold-inducible RNA-binding protein with time-dependent hypothermia in the mouse liver. FEBS Open Bio 2013; 3:192-5. [PMID: 23772393 PMCID: PMC3668523 DOI: 10.1016/j.fob.2013.03.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 03/07/2013] [Accepted: 03/24/2013] [Indexed: 01/03/2023] Open
Abstract
Cold-inducible RNA-binding protein (CIRBP) induced by cold stress modulates the molecular circadian clock in vitro. The present study examines the effect of a ketogenic diet (KD) and fasting on Cirbp expression in the mouse liver. Chronic KD administration induced time-dependent Cirbp expression with hypothermia in mice. The circadian expression of clock genes such as Bmal1 and Clock was phase-advanced and augmented in the liver of mice fed with a KD. Transient food deprivation also induced time-dependent Cirbp expression with hypothermia in mice. These findings suggest that hypothermia is involved in the increased expression of Cirbp under ketogenic or fasting conditions. A ketogenic diet and fasting induce time-of-day-dependent hypothermia in mice. A ketogenic diet and fasting induce time-of-day-dependent Cirbp expression in mice. A ketogenic diet affects the expression of circadian genes in the mouse liver.
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Affiliation(s)
- Katsutaka Oishi
- Biological Clock Research Group, Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan ; Department of Medical Genome Sciences, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, Chiba, Japan
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