1
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Leite PLDA, Maciel LA, da Silva Aguiar S, Sousa CV, Neves RVP, de Sousa Neto IV, Campbell Simões L, Rosa TDS, Simões HG. Systemic Sirtuin 1 as a Potential Target to Mediate Interactions Between Body Fat and Testosterone Concentration in Master Athletes. J Aging Phys Act 2024; 32:438-445. [PMID: 38417433 DOI: 10.1123/japa.2023-0193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 10/19/2023] [Accepted: 12/28/2023] [Indexed: 03/01/2024]
Abstract
Evidence indicates that master athletes have higher concentration of Sirtuin 1 (Sirt1), lower body fat (BF), and greater activity of the hypothalamic-pituitary-gonadal axis in comparison to untrained peers. However, no published data have demonstrated possible mediation effect of Sirt1 in the interaction of BF and testosterone in this population. Therefore, this study compared and verified possible associations between Sirt1, BF, fat mass index (FMI), testosterone, luteinizing hormone (LH), and testosterone/luteinizing hormone (T/LH) ratio in middle-aged master athletes (n = 54; 51.22 ± 7.76 years) and control middle-aged peers (n = 21; 47.76 ± 8.47 years). Venous blood was collected for testosterone, LH, and Sirt1. BF was assessed through skinfold protocol. Although LH concentration did not differ between groups, master athletes presented higher concentration of Sirt1, testosterone, and T/LH ratio, and lower BF and FMI in relation to age-matched nonathletes. Moreover, Sirt1 correlated positively with testosterone and T/LH ratio, negatively with BF, and was not significantly correlated with LH (mediation analysis revealed the effect of BF on testosterone is mediated by Sirt1 and vice versa; R2 = .1776; p = .032). In conclusion, master athletes have higher testosterone, T/LH ratio, and Sirt1, and lower BF and FMI in relation to untrained peers. Furthermore, Sirt1 was negatively associated with BF and positively associated with testosterone and T/LH ratio. These findings suggest that increased circulating Sirt1, possibly due to the master athlete's training regimens and lifestyle, exhibits a potential mediation effect on the interaction between endocrine function and body composition.
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Affiliation(s)
- Patricio Lopes de Araújo Leite
- Graduate Program in Physical Activity, Health, and Human Performance, Catholic University of Brasilia, Taguatinga, Brazil
| | - Larissa Alves Maciel
- Graduate Program in Physical Activity, Health, and Human Performance, Catholic University of Brasilia, Taguatinga, Brazil
| | - Samuel da Silva Aguiar
- Physical Education Department, University Centre of the Federal District, Brasilia, Brazil
| | - Caio Victor Sousa
- Department of Health and Human Sciences, Loyola Marymount University, Los Angeles, CA, USA
| | - Rodrigo Vanerson Passos Neves
- Graduate Program in Physical Activity, Health, and Human Performance, Catholic University of Brasilia, Taguatinga, Brazil
| | - Ivo Vieira de Sousa Neto
- School of Physical Education and Sport of Ribeirão Preto, University of São Paulo, São Paulo, Brazil
| | | | - Thiago Dos Santos Rosa
- Graduate Program in Physical Activity, Health, and Human Performance, Catholic University of Brasilia, Taguatinga, Brazil
| | - Herbert Gustavo Simões
- Graduate Program in Physical Activity, Health, and Human Performance, Catholic University of Brasilia, Taguatinga, Brazil
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2
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Lu H. Inflammatory liver diseases and susceptibility to sepsis. Clin Sci (Lond) 2024; 138:435-487. [PMID: 38571396 DOI: 10.1042/cs20230522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 01/09/2024] [Accepted: 03/12/2024] [Indexed: 04/05/2024]
Abstract
Patients with inflammatory liver diseases, particularly alcohol-associated liver disease and metabolic dysfunction-associated fatty liver disease (MAFLD), have higher incidence of infections and mortality rate due to sepsis. The current focus in the development of drugs for MAFLD is the resolution of non-alcoholic steatohepatitis and prevention of progression to cirrhosis. In patients with cirrhosis or alcoholic hepatitis, sepsis is a major cause of death. As the metabolic center and a key immune tissue, liver is the guardian, modifier, and target of sepsis. Septic patients with liver dysfunction have the highest mortality rate compared with other organ dysfunctions. In addition to maintaining metabolic homeostasis, the liver produces and secretes hepatokines and acute phase proteins (APPs) essential in tissue protection, immunomodulation, and coagulation. Inflammatory liver diseases cause profound metabolic disorder and impairment of energy metabolism, liver regeneration, and production/secretion of APPs and hepatokines. Herein, the author reviews the roles of (1) disorders in the metabolism of glucose, fatty acids, ketone bodies, and amino acids as well as the clearance of ammonia and lactate in the pathogenesis of inflammatory liver diseases and sepsis; (2) cytokines/chemokines in inflammatory liver diseases and sepsis; (3) APPs and hepatokines in the protection against tissue injury and infections; and (4) major nuclear receptors/signaling pathways underlying the metabolic disorders and tissue injuries as well as the major drug targets for inflammatory liver diseases and sepsis. Approaches that focus on the liver dysfunction and regeneration will not only treat inflammatory liver diseases but also prevent the development of severe infections and sepsis.
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Affiliation(s)
- Hong Lu
- Department of Pharmacology, SUNY Upstate Medical University, Syracuse, NY 13210, U.S.A
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3
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Kumar S, Shenoy S, Swamy RS, Ravichandiran V, Kumar N. Fluoride-Induced Mitochondrial Dysfunction and Approaches for Its Intervention. Biol Trace Elem Res 2024; 202:835-849. [PMID: 37300595 DOI: 10.1007/s12011-023-03720-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Accepted: 05/28/2023] [Indexed: 06/12/2023]
Abstract
Fluoride is present everywhere in nature. The primary way that individuals are exposed to fluoride is by drinking water. It's interesting to note that while low fluoride levels are good for bone and tooth growth, prolonged fluoride exposure is bad for human health. Additionally, preclinical studies link oxidative stress, inflammation, and programmed cell death to fluoride toxicity. Moreover, mitochondria play a crucial role in the production of reactive oxygen species (ROS). On the other hand, little is known about fluoride's impact on mitophagy, biogenesis, and mitochondrial dynamics. These actions control the growth, composition, and organisation of mitochondria, and the purification of mitochondrial DNA helps to inhibit the production of reactive oxygen species and the release of cytochrome c, which enables cells to survive the effects of fluoride poisoning. In this review, we discuss the different pathways involved in mitochondrial toxicity and dysfunction induced by fluoride. For therapeutic approaches, we discussed different phytochemical and pharmacological agents which reduce the toxicity of fluoride via maintained by imbalanced cellular processes, mitochondrial dynamics, and scavenging the ROS.
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Affiliation(s)
- Sachindra Kumar
- National Institute of Pharmaceutical Education and Research, Hajipur, Industrial Area Hajipur, Vaishali, 844102, India
| | - Smita Shenoy
- Department of Pharmacology, Kasturba Medical College, Manipal, Manipal Academy of Higher Education (MAHE), Manipal, 576104, India
| | - Ravindra Shantakumar Swamy
- Division of Anatomy, Department of Basic Medical Sciences (DBMS), Manipal Academy of Higher Education (MAHE), Manipal, 576104, India
| | - V Ravichandiran
- National Institute of Pharmaceutical Education and Research, Hajipur, Industrial Area Hajipur, Vaishali, 844102, India
| | - Nitesh Kumar
- National Institute of Pharmaceutical Education and Research, Hajipur, Industrial Area Hajipur, Vaishali, 844102, India.
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4
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Dongoran RA, Mardiana M, Huang CY, Situmorang JH. Boosting NAD+ levels through fasting to aid in COVID-19 recovery. Front Immunol 2024; 15:1319106. [PMID: 38420124 PMCID: PMC10899445 DOI: 10.3389/fimmu.2024.1319106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 02/01/2024] [Indexed: 03/02/2024] Open
Affiliation(s)
- Rachmad Anres Dongoran
- Directorate of Drug Registration, Indonesian Food and Drug Authority, Jakarta, Indonesia
- Center for Chinese Studies, National Central Library, Taipei, Taiwan
| | - Meity Mardiana
- Institute of Medical Sciences, Tzu Chi University, Hualien, Taiwan
| | - Chih-Yang Huang
- Cardiovascular and Mitochondrial Related Disease Research Center, Buddhist Tzu Chi General Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan
- Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung, Taiwan
- Department of Biotechnology, Asia University, Taichung, Taiwan
- Center of General Education, Buddhist Tzu Chi Medical Foundation, Tzu Chi University of Science and Technology, Hualien, Taiwan
| | - Jiro Hasegawa Situmorang
- Cardiovascular and Mitochondrial Related Disease Research Center, Buddhist Tzu Chi General Hospital, Buddhist Tzu Chi Medical Foundation, Hualien, Taiwan
- Center for Biomedical Research, National Research and Innovation Agency (BRIN), Cibinong, Indonesia
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5
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Gautam S, Zhang L, Lee C, Arnaoutova I, Chen HD, Resaz R, Eva A, Mansfield BC, Chou JY. Molecular mechanism underlying impaired hepatic autophagy in glycogen storage disease type Ib. Hum Mol Genet 2023; 32:262-275. [PMID: 35961004 PMCID: PMC10148728 DOI: 10.1093/hmg/ddac197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 07/25/2022] [Accepted: 08/10/2022] [Indexed: 01/18/2023] Open
Abstract
Type Ib glycogen storage disease (GSD-Ib) is caused by a deficiency in the glucose-6-phosphate (G6P) transporter (G6PT) that translocates G6P from the cytoplasm into the endoplasmic reticulum lumen, where the intraluminal G6P is hydrolyzed to glucose by glucose-6-phosphatase-α (G6Pase-α). Clinically, GSD-Ib patients manifest a metabolic phenotype of impaired blood glucose homeostasis and a long-term risk of hepatocellular adenoma/carcinoma (HCA/HCC). Studies have shown that autophagy deficiency contributes to hepatocarcinogenesis. In this study, we show that G6PT deficiency leads to impaired hepatic autophagy evident from attenuated expression of many components of the autophagy network, decreased autophagosome formation and reduced autophagy flux. The G6PT-deficient liver displayed impaired sirtuin 1 (SIRT1) and AMP-activated protein kinase (AMPK) signaling, along with reduced expression of SIRT1, forkhead boxO3a (FoxO3a), liver kinase B-1 (LKB1) and the active p-AMPK. Importantly, we show that overexpression of either SIRT1 or LKB1 in G6PT-deficient liver restored autophagy and SIRT1/FoxO3a and LKB1/AMPK signaling. The hepatosteatosis in G6PT-deficient liver decreased SIRT1 expression. LKB1 overexpression reduced hepatic triglyceride levels, providing a potential link between LKB1/AMPK signaling upregulation and the increase in SIRT1 expression. In conclusion, downregulation of SIRT1/FoxO3a and LKB1/AMPK signaling underlies impaired hepatic autophagy which may contribute to HCA/HCC development in GSD-Ib. Understanding this mechanism may guide future therapies.
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Affiliation(s)
- Sudeep Gautam
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20802, USA
| | - Lisa Zhang
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20802, USA
| | - Cheol Lee
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20802, USA
| | - Irina Arnaoutova
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20802, USA
| | - Hung Dar Chen
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20802, USA
| | - Roberta Resaz
- Istituto Giannina Gaslini, Largo Gaslini 5, 16147, Genoa, Italy
| | - Alessandra Eva
- Istituto Giannina Gaslini, Largo Gaslini 5, 16147, Genoa, Italy
| | - Brian C Mansfield
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20802, USA
| | - Janice Y Chou
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20802, USA
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6
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PPARα in the Epigenetic Driver Seat of NAFLD: New Therapeutic Opportunities for Epigenetic Drugs? Biomedicines 2022; 10:biomedicines10123041. [PMID: 36551797 PMCID: PMC9775974 DOI: 10.3390/biomedicines10123041] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 11/11/2022] [Accepted: 11/16/2022] [Indexed: 11/27/2022] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) is a growing epidemic and the most common cause of chronic liver disease worldwide. It consists of a spectrum of liver disorders ranging from simple steatosis to NASH which predisposes patients to further fibrosis, cirrhosis and even hepatocarcinoma. Despite much research, an approved treatment is still lacking. Finding new therapeutic targets has therefore been a main priority. Known as a main regulator of the lipid metabolism and highly expressed in the liver, the nuclear receptor peroxisome proliferator-activated receptor-α (PPARα) has been identified as an attractive therapeutic target. Since its expression is silenced by DNA hypermethylation in NAFLD patients, many research strategies have aimed to restore the expression of PPARα and its target genes involved in lipid metabolism. Although previously tested PPARα agonists did not ameliorate the disease, current research has shown that PPARα also interacts and regulates epigenetic DNMT1, JMJD3, TET and SIRT1 enzymes. Moreover, there is a growing body of evidence suggesting the orchestrating role of epigenetics in the development and progression of NAFLD. Therefore, current therapeutic strategies are shifting more towards epigenetic drugs. This review provides a concise overview of the epigenetic regulation of NAFLD with a focus on PPARα regulation and highlights recently identified epigenetic interaction partners of PPARα.
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7
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Ge Y, Zadeh M, Mohamadzadeh M. Vitamin B12 coordinates ileal epithelial cell and microbiota functions to resist Salmonella infection in mice. J Exp Med 2022; 219:213271. [PMID: 35674742 DOI: 10.1084/jem.20220057] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 04/15/2022] [Accepted: 05/25/2022] [Indexed: 12/15/2022] Open
Abstract
Deprivation of vitamin B12 (VB12) is linked to various diseases, but the underlying mechanisms in disease progression are poorly understood. Using multiomic approaches, we elucidated the responses of ileal epithelial cells (iECs) and gut microbiome to VB12 dietary restriction. Here, VB12 deficiency impaired the transcriptional and metabolic programming of iECs and reduced epithelial mitochondrial respiration and carnitine shuttling during intestinal Salmonella Typhimurium (STm) infection. Fecal microbial and untargeted metabolomic profiling identified marked changes related to VB12 deficiency, including reductions of metabolites potentially activating mitochondrial β-oxidation in iECs and short-chain fatty acids (SCFAs). Depletion of SCFA-producing microbes by streptomycin treatment decreased the VB12-dependent STm protection. Moreover, compromised mitochondrial function of iECs correlated with declined cell capability to utilize oxygen, leading to uncontrolled oxygen-dependent STm expansion in VB12-deficient mice. Our findings uncovered previously unrecognized mechanisms through which VB12 coordinates ileal epithelial mitochondrial homeostasis and gut microbiota to regulate epithelial oxygenation, resulting in the control of aerobic STm infection.
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Affiliation(s)
- Yong Ge
- Division of Gastroenterology & Nutrition, Department of Medicine, University of Texas Health, San Antonio, TX.,Department of Infectious Diseases & Immunology, University of Florida, Gainesville, FL
| | - Mojgan Zadeh
- Division of Gastroenterology & Nutrition, Department of Medicine, University of Texas Health, San Antonio, TX.,Department of Infectious Diseases & Immunology, University of Florida, Gainesville, FL
| | - Mansour Mohamadzadeh
- Division of Gastroenterology & Nutrition, Department of Medicine, University of Texas Health, San Antonio, TX.,Department of Infectious Diseases & Immunology, University of Florida, Gainesville, FL
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8
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Su M, Zhao W, Xu S, Weng J. Resveratrol in Treating Diabetes and Its Cardiovascular Complications: A Review of Its Mechanisms of Action. Antioxidants (Basel) 2022; 11:antiox11061085. [PMID: 35739982 PMCID: PMC9219679 DOI: 10.3390/antiox11061085] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 05/21/2022] [Accepted: 05/27/2022] [Indexed: 02/01/2023] Open
Abstract
Diabetes mellitus (DM) is one of the most prevalent chronic diseases worldwide. High morbidity and mortality caused by DM are closely linked to its complications in multiple organs/tissues, including cardiovascular complications, diabetic nephropathy, and diabetic neuropathy. Resveratrol is a plant-derived polyphenolic compound with pleiotropic protective effects, ranging from antioxidant and anti-inflammatory to hypoglycemic effects. Recent studies strongly suggest that the consumption of resveratrol offers protection against diabetes and its cardiovascular complications. The protective effects of resveratrol involve the regulation of multiple signaling pathways, including inhibition of oxidative stress and inflammation, enhancement of insulin sensitivity, induction of autophagy, regulation of lipid metabolism, promotion of GLUT4 expression, and translocation, and activation of SIRT1/AMPK signaling axis. The cardiovascular protective effects of resveratrol have been recently reviewed in the literature, but the role of resveratrol in preventing diabetes mellitus and its cardiovascular complications has not been systematically reviewed. Therefore, in this review, we summarize the pharmacological effects and mechanisms of action of resveratrol based on in vitro and in vivo studies, highlighting the therapeutic potential of resveratrol in the prevention and treatment of diabetes and its cardiovascular complications.
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9
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Xu H, Liu YY, Li LS, Liu YS. Sirtuins at the Crossroads between Mitochondrial Quality Control and Neurodegenerative Diseases: Structure, Regulation, Modifications, and Modulators. Aging Dis 2022; 14:794-824. [PMID: 37191431 DOI: 10.14336/ad.2022.1123] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 11/23/2022] [Indexed: 04/03/2023] Open
Abstract
Sirtuins (SIRT1-SIRT7), a family of nicotinamide adenine dinucleotide (NAD+)-dependent enzymes, are key regulators of life span and metabolism. In addition to acting as deacetylates, some sirtuins have the properties of deacylase, decrotonylase, adenosine diphosphate (ADP)-ribosyltransferase, lipoamidase, desuccinylase, demalonylase, deglutarylase, and demyristolyase. Mitochondrial dysfunction occurs early on and acts causally in the pathogenesis of neurodegenerative diseases, including Alzheimer's disease (AD), Parkinson's disease (PD), and Huntington's disease (HD). Sirtuins are implicated in the regulation of mitochondrial quality control, which is highly associated with the pathogenesis of neurodegenerative diseases. There is growing evidence indicating that sirtuins are promising and well-documented molecular targets for the treatment of mitochondrial dysfunction and neurodegenerative disorders by regulating mitochondrial quality control, including mitochondrial biogenesis, mitophagy, mitochondrial fission/fusion dynamics, and mitochondrial unfolded protein responses (mtUPR). Therefore, elucidation of the molecular etiology of sirtuin-mediated mitochondrial quality control points to new prospects for the treatment of neurodegenerative diseases. However, the mechanisms underlying sirtuin-mediated mitochondrial quality control remain obscure. In this review, we update and summarize the current understanding of the structure, function, and regulation of sirtuins with an emphasis on the cumulative and putative effects of sirtuins on mitochondrial biology and neurodegenerative diseases, particularly their roles in mitochondrial quality control. In addition, we outline the potential therapeutic applications for neurodegenerative diseases of targeting sirtuin-mediated mitochondrial quality control through exercise training, calorie restriction, and sirtuin modulators in neurodegenerative diseases.
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10
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Fang Y, Wang X, Yang D, Lu Y, Wei G, Yu W, Liu X, Zheng Q, Ying J, Hua F. Relieving Cellular Energy Stress in Aging, Neurodegenerative, and Metabolic Diseases, SIRT1 as a Therapeutic and Promising Node. Front Aging Neurosci 2021; 13:738686. [PMID: 34616289 PMCID: PMC8489683 DOI: 10.3389/fnagi.2021.738686] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2021] [Accepted: 08/26/2021] [Indexed: 12/12/2022] Open
Abstract
The intracellular energy state will alter under the influence of physiological or pathological stimuli. In response to this change, cells usually mobilize various molecules and their mechanisms to promote the stability of the intracellular energy status. Mitochondria are the main source of ATP. Previous studies have found that the function of mitochondria is impaired in aging, neurodegenerative diseases, and metabolic diseases, and the damaged mitochondria bring lower ATP production, which further worsens the progression of the disease. Silent information regulator-1 (SIRT1) is a multipotent molecule that participates in the regulation of important biological processes in cells, including cellular metabolism, cell senescence, and inflammation. In this review, we mainly discuss that promoting the expression and activity of SIRT1 contributes to alleviating the energy stress produced by physiological and pathological conditions. The review also discusses the mechanism of precise regulation of SIRT1 expression and activity in various dimensions. Finally, according to the characteristics of this mechanism in promoting the recovery of mitochondrial function, the relationship between current pharmacological preparations and aging, neurodegenerative diseases, metabolic diseases, and other diseases was analyzed.
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Affiliation(s)
- Yang Fang
- Department of Anesthesiology, The Second Affiliated Hospital of Nanchang University, Nanchang, China.,Key Laboratory of Anesthesiology of Jiangxi Province, Nanchang, China
| | - Xifeng Wang
- Department of Anesthesiology, The First Affiliated Hospital of Nanchang University, Nanchang, China
| | - Danying Yang
- Department of Anesthesiology, The Second Affiliated Hospital of Nanchang University, Nanchang, China.,Key Laboratory of Anesthesiology of Jiangxi Province, Nanchang, China
| | - Yimei Lu
- Department of Anesthesiology, The Second Affiliated Hospital of Nanchang University, Nanchang, China.,Key Laboratory of Anesthesiology of Jiangxi Province, Nanchang, China
| | - Gen Wei
- Department of Anesthesiology, The Second Affiliated Hospital of Nanchang University, Nanchang, China.,Key Laboratory of Anesthesiology of Jiangxi Province, Nanchang, China
| | - Wen Yu
- Department of Anesthesiology, The Second Affiliated Hospital of Nanchang University, Nanchang, China.,Key Laboratory of Anesthesiology of Jiangxi Province, Nanchang, China
| | - Xing Liu
- Department of Anesthesiology, The Second Affiliated Hospital of Nanchang University, Nanchang, China.,Key Laboratory of Anesthesiology of Jiangxi Province, Nanchang, China
| | - Qingcui Zheng
- Department of Anesthesiology, The Second Affiliated Hospital of Nanchang University, Nanchang, China.,Key Laboratory of Anesthesiology of Jiangxi Province, Nanchang, China
| | - Jun Ying
- Department of Anesthesiology, The Second Affiliated Hospital of Nanchang University, Nanchang, China.,Key Laboratory of Anesthesiology of Jiangxi Province, Nanchang, China
| | - Fuzhou Hua
- Department of Anesthesiology, The Second Affiliated Hospital of Nanchang University, Nanchang, China.,Key Laboratory of Anesthesiology of Jiangxi Province, Nanchang, China
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11
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Gautam S, Zhang L, Arnaoutova I, Lee C, Mansfield BC, Chou JY. The signaling pathways implicated in impairment of hepatic autophagy in glycogen storage disease type Ia. Hum Mol Genet 2021; 29:834-844. [PMID: 31961433 DOI: 10.1093/hmg/ddaa007] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 12/19/2019] [Accepted: 01/15/2020] [Indexed: 01/27/2023] Open
Abstract
Glucose-6-phosphatase-α (G6Pase-α or G6PC) deficiency in glycogen storage disease type-Ia (GSD-Ia) leads to impaired hepatic autophagy, a recycling process important for cellular metabolism and homeostasis. Autophagy can be regulated by several energy sensing pathways, including sirtuin 1 (SIRT1), forkhead box O (FoxO), AMP-activated protein kinase (AMPK), peroxisome proliferator-activated receptor-α (PPAR-α), and mammalian target of rapamycin (mTOR). Using 10-day old global G6pc-deficient (G6pc-/-) mice, hepatic autophagy impairment was attributed to activation of mTOR and inhibition of AMPK signaling. In other studies, using adult liver-specific G6pc-deficient mice at both pre-tumor and tumor stages, hepatic autophagy impairment was attributed to downregulation of SIRT1 signaling and mTOR was not implicated. In this study, we provide a detailed analysis of the major autophagy pathways in young G6pc-/- mice over the first 4 weeks of life. We show that impaired SIRT1, FoxO3a, AMPK, and PPAR-α signaling are responsible for autophagy impairment but mTOR is involved minimally. Hepatic SIRT1 overexpression corrects defective autophagy, restores the expression of FoxO3a and liver kinase B1 but fails to normalize impaired PPAR-α expression or metabolic abnormalities associated with GSD-Ia. Importantly, restoration of hepatic G6Pase-α expression in G6pc-/- mice corrects defective autophagy, restores SIRT1/FoxO3a/AMPK/PPAR-α signaling and rectifies metabolic abnormalities. Taken together, these data show that hepatic autophagy impairment in GSD-Ia is mediated by downregulation of SIRT1/FoxO3a/AMPK/PPAR-α signaling.
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Affiliation(s)
- Sudeep Gautam
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development
| | - Lisa Zhang
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development
| | - Irina Arnaoutova
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development
| | - Cheol Lee
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development
| | - Brian C Mansfield
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development.,Foundation Fighting Blindness, Columbia, MD 21046, USA
| | - Janice Y Chou
- Section on Cellular Differentiation, Division of Translational Medicine, Eunice Kennedy Shriver National Institute of Child Health and Human Development
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12
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Hammer SS, Vieira CP, McFarland D, Sandler M, Levitsky Y, Dorweiler TF, Lydic TA, Asare-Bediako B, Adu-Agyeiwaah Y, Sielski MS, Dupont M, Longhini AL, Li Calzi S, Chakraborty D, Seigel GM, Proshlyakov DA, Grant MB, Busik JV. Fasting and fasting-mimicking treatment activate SIRT1/LXRα and alleviate diabetes-induced systemic and microvascular dysfunction. Diabetologia 2021; 64:1674-1689. [PMID: 33770194 PMCID: PMC8236268 DOI: 10.1007/s00125-021-05431-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Accepted: 01/04/2021] [Indexed: 12/13/2022]
Abstract
AIMS/HYPOTHESIS Homo sapiens evolved under conditions of intermittent food availability and prolonged fasting between meals. Periods of fasting are important for recovery from meal-induced oxidative and metabolic stress, and tissue repair. Constant high energy-density food availability in present-day society contributes to the pathogenesis of chronic diseases, including diabetes and its complications, with intermittent fasting (IF) and energy restriction shown to improve metabolic health. We have previously demonstrated that IF prevents the development of diabetic retinopathy in a mouse model of type 2 diabetes (db/db); however the mechanisms of fasting-induced health benefits and fasting-induced risks for individuals with diabetes remain largely unknown. Sirtuin 1 (SIRT1), a nutrient-sensing deacetylase, is downregulated in diabetes. In this study, the effect of SIRT1 stimulation by IF, fasting-mimicking cell culture conditions (FMC) or pharmacological treatment using SRT1720 was evaluated on systemic and retinal metabolism, systemic and retinal inflammation and vascular and bone marrow damage. METHODS The effects of IF were modelled in vivo using db/db mice and in vitro using bovine retinal endothelial cells or rat retinal neuroglial/precursor R28 cell line serum starved for 24 h. mRNA expression was analysed by quantitative PCR (qPCR). SIRT1 activity was measured via histone deacetylase activity assay. NR1H3 (also known as liver X receptor alpha [LXRα]) acetylation was measured via western blot analysis. RESULTS IF increased Sirt1 mRNA expression in mouse liver and retina when compared with non-fasted animals. IF also increased SIRT1 activity eightfold in mouse retina while FMC increased SIRT1 activity and expression in retinal endothelial cells when compared with control. Sirt1 expression was also increased twofold in neuronal retina progenitor cells (R28) after FMC treatment. Moreover, FMC led to SIRT1-mediated LXRα deacetylation and subsequent 2.4-fold increase in activity, as measured by increased mRNA expression of the genes encoding ATP-binding cassette transporter (Abca1 and Abcg1). These changes were reduced when retinal endothelial cells expressing a constitutively acetylated LXRα mutant were tested. Increased SIRT1/LXR/ABC-mediated cholesterol export resulted in decreased retinal endothelial cell cholesterol levels. Direct activation of SIRT1 by SRT1720 in db/db mice led to a twofold reduction of diabetes-induced inflammation in the retina and improved diabetes-induced visual function impairment, as measured by electroretinogram and optokinetic response. In the bone marrow, there was prevention of diabetes-induced myeloidosis and decreased inflammatory cytokine expression. CONCLUSIONS/INTERPRETATION Taken together, activation of SIRT1 signalling by IF or through pharmacological activation represents an effective therapeutic strategy that provides a mechanistic link between the advantageous effects associated with fasting regimens and prevention of microvascular and bone marrow dysfunction in diabetes.
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Affiliation(s)
- Sandra S Hammer
- Department of Physiology, Michigan State University, East Lansing, MI, USA
| | - Cristiano P Vieira
- Department of Ophthalmology and Visual Sciences, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Delaney McFarland
- Department of Physiology, Michigan State University, East Lansing, MI, USA
| | - Maximilian Sandler
- Department of Physiology, Michigan State University, East Lansing, MI, USA
| | - Yan Levitsky
- Department of Physiology, Michigan State University, East Lansing, MI, USA
- Department of Chemistry, Michigan State University, East Lansing, MI, USA
| | - Tim F Dorweiler
- Department of Physiology, Michigan State University, East Lansing, MI, USA
| | - Todd A Lydic
- Collaborative Mass Spectrometry Core, Michigan State University, East Lansing, MI, USA
| | - Bright Asare-Bediako
- Department of Ophthalmology and Visual Sciences, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Yvonne Adu-Agyeiwaah
- Department of Ophthalmology and Visual Sciences, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Micheli S Sielski
- Department of Ophthalmology and Visual Sciences, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Mariana Dupont
- Department of Ophthalmology and Visual Sciences, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Ana Leda Longhini
- Department of Ophthalmology and Visual Sciences, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Sergio Li Calzi
- Department of Ophthalmology and Visual Sciences, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Dibyendu Chakraborty
- Department of Ophthalmology and Visual Sciences, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Gail M Seigel
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY, USA
| | - Denis A Proshlyakov
- Department of Physiology, Michigan State University, East Lansing, MI, USA
- Department of Chemistry, Michigan State University, East Lansing, MI, USA
| | - Maria B Grant
- Department of Ophthalmology and Visual Sciences, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
| | - Julia V Busik
- Department of Physiology, Michigan State University, East Lansing, MI, USA.
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13
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Tsvetkov P, Adler J, Strobelt R, Adamovich Y, Asher G, Reuven N, Shaul Y. NQO1 Binds and Supports SIRT1 Function. Front Pharmacol 2021; 12:671929. [PMID: 34234670 PMCID: PMC8255383 DOI: 10.3389/fphar.2021.671929] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2021] [Accepted: 05/19/2021] [Indexed: 11/13/2022] Open
Abstract
Silent information regulator 2-related enzyme 1 (SIRT1) is an NAD+-dependent class III deacetylase and a key component of the cellular metabolic sensing pathway. The requirement of NAD+ for SIRT1 activity led us to assume that NQO1, an NADH oxidoreductase producing NAD+, regulates SIRT1 activity. We show here that SIRT1 is capable of increasing NQO1 (NAD(P)H Dehydrogenase Quinone 1) transcription and protein levels. NQO1 physically interacts with SIRT1 but not with an enzymatically dead SIRT1 H363Y mutant. The interaction of NQO1 with SIRT1 is markedly increased under mitochondrial inhibition. Interestingly, under this condition the nuclear pool of NQO1 is elevated. Depletion of NQO1 compromises the role of SIRT1 in inducing transcription of several target genes and eliminates the protective role of SIRT1 following mitochondrial inhibition. Our results suggest that SIRT1 and NQO1 form a regulatory loop where SIRT1 regulates NQO1 expression and NQO1 binds and mediates the protective role of SIRT1 during mitochondrial stress. The interplay between an NADH oxidoreductase enzyme and an NAD+ dependent deacetylase may act as a rheostat in sensing mitochondrial stress.
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Affiliation(s)
- Peter Tsvetkov
- Broad Institute of Harvard and MIT, Cambridge, MA, United States
| | - Julia Adler
- Department of Molecular Genetics Weizmann Institute of Science, Rehovot, Israel
| | - Romano Strobelt
- Department of Molecular Genetics Weizmann Institute of Science, Rehovot, Israel
| | - Yaarit Adamovich
- Department of Molecular Genetics Weizmann Institute of Science, Rehovot, Israel
| | - Gad Asher
- Department of Molecular Genetics Weizmann Institute of Science, Rehovot, Israel
| | - Nina Reuven
- Department of Molecular Genetics Weizmann Institute of Science, Rehovot, Israel
| | - Yosef Shaul
- Department of Molecular Genetics Weizmann Institute of Science, Rehovot, Israel
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14
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Role of PGC-1α in the Mitochondrial NAD + Pool in Metabolic Diseases. Int J Mol Sci 2021; 22:ijms22094558. [PMID: 33925372 PMCID: PMC8123861 DOI: 10.3390/ijms22094558] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Revised: 04/20/2021] [Accepted: 04/23/2021] [Indexed: 12/12/2022] Open
Abstract
Mitochondria play vital roles, including ATP generation, regulation of cellular metabolism, and cell survival. Mitochondria contain the majority of cellular nicotinamide adenine dinucleotide (NAD+), which an essential cofactor that regulates metabolic function. A decrease in both mitochondria biogenesis and NAD+ is a characteristic of metabolic diseases, and peroxisome proliferator-activated receptor γ coactivator 1-α (PGC-1α) orchestrates mitochondrial biogenesis and is involved in mitochondrial NAD+ pool. Here we discuss how PGC-1α is involved in the NAD+ synthesis pathway and metabolism, as well as the strategy for increasing the NAD+ pool in the metabolic disease state.
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15
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Yao W, Wang K, Wang X, Li X, Dong J, Zhang Y, Ding X. Icariin ameliorates endothelial dysfunction in type 1 diabetic rats by suppressing ER stress via the PPARα/Sirt1/AMPKα pathway. J Cell Physiol 2021; 236:1889-1902. [PMID: 32770555 DOI: 10.1002/jcp.29972] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 07/11/2020] [Accepted: 07/14/2020] [Indexed: 12/15/2022]
Abstract
Icariin (ICA), as a flavonoid glycoside, is associated with the improvement of vascular complications in diabetes. However, its protective mechanisms remain to be well-established. Here, we tested the hypothesis that ICA attenuates vascular endothelial dysfunction by inhibiting endoplasmic reticulum (ER) stress in type 1 diabetes. In streptozotocin-induced diabetic rats, ICA positively affected acetylcholine-induced vasodilation and phenylephrine-induced vasoconstriction in aortas. ICA treatment significantly attenuated ER stress in diabetic rats and high-glucose induced human umbilical vein endothelial cells. Incubation with ICA in vitro attenuated vascular reactivity in diabetic rats, which was blocked by the ER stress inducer, and peroxisome proliferator-activated receptor α (PPARα), sirtuin1 (Sirt1), or AMP-activated protein kinase-α (AMPKα) inhibitors. Western blot showed that ICA activated the PPARα/Sirt1/AMPKα pathway, which contributed to reducing ER stress and activating endothelial nitric oxide synthase in vivo and vitro. Our results implicate that ICA normalizes ER stress to attenuate endothelial dysfunction by the regulation of the PPARα/Sirt1/AMPKα pathway.
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Affiliation(s)
- Wenhui Yao
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Kai Wang
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Xiniao Wang
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Xinran Li
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Jieyan Dong
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Yusheng Zhang
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Xuansheng Ding
- School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing, China
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16
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Hou Q, Zhang S, Li Y, Wang H, Zhang D, Qi D, Li Y, Jiang H. New insights on association between circadian rhythm and lipid metabolism in spontaneously hypertensive rats. Life Sci 2021; 271:119145. [PMID: 33548288 DOI: 10.1016/j.lfs.2021.119145] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 01/20/2021] [Accepted: 01/27/2021] [Indexed: 01/20/2023]
Abstract
AIMS The aim of this study is to provide new insights on the association of lipid metabolites, circadian genes and lipid metabolism associated genes in spontaneously hypertensive rats. MATERIALS AND METHODS An untargeted lipidomics using ultrahigh performance liquid chromatography-mass spectrometry metabolomics was used to identify the differentially expressed lipid metabolites over 24 h in Spontaneously hypertensive rats (SHR) with reference to Wistar-Kyoto rats (WKY). The expression of circadian clock genes (Bmal1, Clock, Per1, Per2, Cry1, Cry2) and lipid metabolism related genes (Rev-erbα, Pparα and Sirt1) was analysed RT-qPCR. KEY FINDINGS Ten lipid metabolites with significant differences in their levels in SHR compared to WKY were identified. The levels of MG (25:0), PA (36:3) and PE (38:2) were lower and the levels of LysoPCs (20:0 and 20:3) and TGs (54:5, 59:12, 28:0, 60:10 and 60:13) were found to be higher in SHR. SHR showed obvious disorders in the expression of circadian genes and lipid metabolism associated genes. A strong association between the levels of lipid metabolites and circadian genes and lipid metabolism associated genes was found. SIGNIFICANCE Rhythm genes may further affect the 24-hour lipid metabolism level of spontaneously hypertensive rats by mediating lipid metabolism associated genes. This research provides new insights on the association of lipid metabolites, circadian genes and lipid metabolism associated genes in SHR.
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Affiliation(s)
- Qingqing Hou
- College of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China
| | - Shiming Zhang
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China
| | - Yuan Li
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China
| | - Huanjun Wang
- College of Pharmaceutical Sciences, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China
| | - Dan Zhang
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China; Key Laboratory of Traditional Chinese Medicine Classical Theory, Ministry of Education, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China; Shandong Provincial Key Laboratory of Traditional Chinese Medicine for Basic research, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China
| | - Dongmei Qi
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China
| | - Yunlun Li
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China; Key Laboratory of Traditional Chinese Medicine Classical Theory, Ministry of Education, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China; Shandong Provincial Key Laboratory of Traditional Chinese Medicine for Basic research, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China.
| | - Haiqiang Jiang
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China; Key Laboratory of Traditional Chinese Medicine Classical Theory, Ministry of Education, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China; Shandong Provincial Key Laboratory of Traditional Chinese Medicine for Basic research, Shandong University of Traditional Chinese Medicine, Jinan 250355, Shandong, China.
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17
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Cozzo AJ, Coleman MF, Pearce JB, Pfeil AJ, Etigunta SK, Hursting SD. Dietary Energy Modulation and Autophagy: Exploiting Metabolic Vulnerabilities to Starve Cancer. Front Cell Dev Biol 2020; 8:590192. [PMID: 33224954 PMCID: PMC7674637 DOI: 10.3389/fcell.2020.590192] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Accepted: 10/14/2020] [Indexed: 12/11/2022] Open
Abstract
Cancer cells experience unique and dynamic shifts in their metabolic function in order to survive, proliferate, and evade growth inhibition in the resource-scarce tumor microenvironment. Therefore, identification of pharmacological agents with potential to reprogram cancer cell metabolism may improve clinical outcomes in cancer therapy. Cancer cells also often exhibit an increased dependence on the process known as autophagy, both for baseline survival and as a response to stressors such as chemotherapy or a decline in nutrient availability. There is evidence to suggest that this increased dependence on autophagy in cancer cells may be exploitable clinically by combining autophagy modulators with existing chemotherapies. In light of the increased metabolic rate in cancer cells, interest is growing in approaches aimed at "starving" cancer through dietary and pharmacologic interventions that reduce availability of nutrients and pro-growth hormonal signals known to promote cancer progression. Several dietary approaches, including chronic calorie restriction and multiple forms of fasting, have been investigated for their potential anti-cancer benefits, yielding promising results in animal models. Induction of autophagy in response to dietary energy restriction may underlie some of the observed benefit. However, while interventions based on dietary energy restriction have demonstrated safety in clinical trials, uncertainty remains regarding translation to humans as well as feasibility of achieving compliance due to the potential discomfort and weight loss that accompanies dietary restriction. Further induction of autophagy through dietary or pharmacologic metabolic reprogramming interventions may enhance the efficacy of autophagy inhibition in the context of adjuvant or neo-adjuvant chemotherapy. Nonetheless, it remains unclear whether therapeutic agents aimed at autophagy induction, autophagy inhibition, or both are a viable therapeutic strategy for improving cancer outcomes. This review discusses the literature available for the therapeutic potential of these approaches.
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Affiliation(s)
- Alyssa J Cozzo
- Department of Nutrition, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States.,Duke University School of Medicine, Durham, NC, United States
| | - Michael F Coleman
- Department of Nutrition, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Jane B Pearce
- Department of Nutrition, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Alexander J Pfeil
- Department of Nutrition, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Suhas K Etigunta
- Department of Nutrition, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - Stephen D Hursting
- Department of Nutrition, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States.,Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States.,Nutrition Research Institute, The University of North Carolina at Chapel Hill, Kannapolis, NC, United States
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18
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Asif S, Morrow NM, Mulvihill EE, Kim KH. Understanding Dietary Intervention-Mediated Epigenetic Modifications in Metabolic Diseases. Front Genet 2020; 11:590369. [PMID: 33193730 PMCID: PMC7593700 DOI: 10.3389/fgene.2020.590369] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2020] [Accepted: 09/21/2020] [Indexed: 12/12/2022] Open
Abstract
The global prevalence of metabolic disorders, such as obesity, diabetes and fatty liver disease, is dramatically increasing. Both genetic and environmental factors are well-known contributors to the development of these diseases and therefore, the study of epigenetics can provide additional mechanistic insight. Dietary interventions, including caloric restriction, intermittent fasting or time-restricted feeding, have shown promising improvements in patients' overall metabolic profiles (i.e., reduced body weight, improved glucose homeostasis), and an increasing number of studies have associated these beneficial effects with epigenetic alterations. In this article, we review epigenetic changes involved in both metabolic diseases and dietary interventions in primary metabolic tissues (i.e., adipose, liver, and pancreas) in hopes of elucidating potential biomarkers and therapeutic targets for disease prevention and treatment.
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Affiliation(s)
- Shaza Asif
- University of Ottawa Heart Institute, Ottawa, ON, Canada
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Nadya M. Morrow
- University of Ottawa Heart Institute, Ottawa, ON, Canada
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Erin E. Mulvihill
- University of Ottawa Heart Institute, Ottawa, ON, Canada
- Department of Biochemistry, Microbiology and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
| | - Kyoung-Han Kim
- University of Ottawa Heart Institute, Ottawa, ON, Canada
- Department of Cellular and Molecular Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada
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19
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Pecher SJ, Potthast AB, von Versen-Höynck F, Das AM. Impact of Short-Term Hypoxia on Sirtuins as Regulatory Elements in HUVECs. J Clin Med 2020; 9:jcm9082604. [PMID: 32796661 PMCID: PMC7464651 DOI: 10.3390/jcm9082604] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 08/07/2020] [Accepted: 08/09/2020] [Indexed: 12/11/2022] Open
Abstract
Background: Sirtuins (SIRT) are NAD+-dependent deacetylases that are involved in stress response, antioxidative defense, and longevity via posttranslational modifications. SIRT1 directly activates nitric oxide synthase (NOS). Aging is associated with a reduced sirtuin function and reduction of the cofactor NAD+. Age-related atherosclerosis and vascular diseases are linked to a compromised sirtuin function. Vascular events like stroke and cardiac infarction result in acute hypoxia, which can additionally impact sirtuins and thus the vascular function. This prompted us to study sirtuins in intact HUVECs, under acute, short-term hypoxic conditions. Methods: We measured intracellular sirtuin and NAD+ levels in HUVECs exposed to hypoxia (2% O₂) for 10–120 min, compared to normoxic controls. SIRT1, SIRT3, and SIRT4 were measured at the protein (Western Blot) and the transcript level (qRT-PCR), SIRT1 and SIRT3 at the enzyme level (fluorometrically), and NAD+ levels were measured spectrophotometrically. Results: We observed a reduction of SIRT1 and SIRT4 at the protein level, a downregulation of SIRT1 at the transcript level and increased NAD+ levels under hypoxia. SIRT3 was not affected by hypoxia. Conclusions: Downregulation of SIRT1 under hypoxia might reduce production of the reactive oxygen species (ROS) via the respiratory chain and inhibit the mitochondrial ATP-synthase, resulting in energy conservation. NOS might be impaired if SIRT1 is decreased. Increased NAD+ levels might compensate these effects. Hypoxic downregulation of SIRT4 might lead to mitochondrial uncoupling, hence endothelial dysfunction, and ADP/ATP-translocase 2 (ANT2)-inhibition. NAD+ upregulation might partly compensate this effect.
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Affiliation(s)
- Simone Johanna Pecher
- Clinic for Pediatric Kidney, Liver and Metabolic Diseases, Hannover Medical School (MHH), Carl-Neuberg-Straße 1, 30625 Hannover, Germany; (S.J.P.); (A.B.P.)
| | - Arne Björn Potthast
- Clinic for Pediatric Kidney, Liver and Metabolic Diseases, Hannover Medical School (MHH), Carl-Neuberg-Straße 1, 30625 Hannover, Germany; (S.J.P.); (A.B.P.)
| | - Frauke von Versen-Höynck
- Department of Obstetrics and Gynecology, Hannover Medical School (MHH), Carl-Neuberg-Straße 1, 30625 Hannover, Germany;
| | - Anibh Martin Das
- Clinic for Pediatric Kidney, Liver and Metabolic Diseases, Hannover Medical School (MHH), Carl-Neuberg-Straße 1, 30625 Hannover, Germany; (S.J.P.); (A.B.P.)
- Correspondence: ; Tel.: +49-511-532-3220
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20
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Yang Y, Wang Y, He Z, Liu Y, Chen C, Wang Y, Wang DW, Wang H. Trimetazidine Inhibits Renal Tubular Epithelial Cells to Mesenchymal Transition in Diabetic Rats via Upregulation of Sirt1. Front Pharmacol 2020; 11:1136. [PMID: 32848753 PMCID: PMC7403491 DOI: 10.3389/fphar.2020.01136] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Accepted: 07/13/2020] [Indexed: 12/12/2022] Open
Abstract
Trimetazidine (TMZ), as a metabolic regulator, is effective in treatment of coronary atherosclerotic heart disease with rare side effects in the clinic for long years. Interestingly, studies have shown that TMZ protects against several acute kidney injuries (AKI). However, the effect of TMZ on chronic kidney diseases (CKD) remains unknown. This study aimed to investigate the role of TMZ in diabetic nephropathy (DN) and its potential mechanisms. A rat model of DN was established in male Sprague-Dawley rats by streptozotocin (STZ) intraperitoneal injection. Experimental rats were separated into three groups: control, DN and DN + TMZ treatment. Metabolic parameters, pathological features and renal function markers were evaluated after 20 weeks of diabetes induction. In vitro experiments, the effect of TMZ on high fat and high glucose (HFG) induced or TGFβ1-induced epithelial-to-mesenchymal transition (EMT) was examined in HK-2 cells. Our results showed that TMZ could maintain renal function without affecting hemodynamic and plasma metabolic levels in diabetic rats. The effect was associated with a reversion of pathological progression of DN, especially for tubulointerstitial fibrosis. EMT is an important contributor to renal fibrosis. In this study, we investigated the role of TMZ in the process of EMT in DN. Mechanistically; TMZ attenuated HFG-induced EMT by relieving oxidative stress via deacetylation forkhead box O1 (FoxO1) in a Sirt1-dependent pathway. And it suppressed TGFβ1-induced EMT by deacetylating Smd4 in a Sirt1-dependent manner. Moreover, our study found that TMZ upregulated Sirt1 expression by increasing the expression of nicotinamide phosphoribosyl transferase (Nampt), which is a rate limiting enzyme for nicotinamide adenine dinucleotide (NAD+) generation by salvage pathway. And the increased NAD+ promoted Sirt1 expression. In conclusion, TMZ can prevent renal dysfunction and pathogenesis of tubulointerstitial fibrosis in DN, partly by inhibition of EMT via FoxO1/ROS pathway and TGFβ/Smad pathway in a Nampt/NAD+/Sirt1 dependent manner.
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Affiliation(s)
- Yong Yang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Yong Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Zuowen He
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Yunchang Liu
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Chen Chen
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Yan Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Dao Wen Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, China
| | - Hong Wang
- Division of Cardiology, Department of Internal Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Hubei Key Laboratory of Genetics and Molecular Mechanisms of Cardiologic Disorders, Huazhong University of Science and Technology, Wuhan, China
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21
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Increased serum levels of advanced glycation end products due to induced molting in hen layers trigger a proinflammatory response by peripheral blood leukocytes. Poult Sci 2020; 99:3452-3462. [PMID: 32616239 PMCID: PMC7597842 DOI: 10.1016/j.psj.2020.04.009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Revised: 04/01/2020] [Accepted: 04/03/2020] [Indexed: 12/17/2022] Open
Abstract
Induced molting (IM), a severe detriment to animal welfare, is still used in the poultry industry in some countries to increase or rejuvenate egg production and is responsible for several physiological perturbations, possibly including reactive oxidative stress, a form of metabolic stress. Because metabolic stress has been shown to induce a proinflammatory response involved in attempts to restore homeostasis, we hypothesized that similar responses followed IM. To confirm this hypothesis, we initially confirmed the establishment of oxidative stress during IM in 75-wk-old layers by demonstrating increased production of advanced glycation end products (AGE). Concomitant with increased oxidative metabolites, cellular stress was demonstrated in peripheral blood leukocytes (PBL) by increased levels of stress gene products (the glucocorticoid receptor, sirtuin-1, and heat shock protein 70 mRNA). Increased expression of stress proteins in PBL was followed by a proinflammatory response as demonstrated by increased levels of proinflammatory gene products (IL-6 and IL-1β mRNA); increased expression of these gene products was also demonstrated in direct response to AGE in vitro, thus establishing a direct link between oxidative and cellular stress. To establish a possible pathway for inducing a proinflammatory response by PBL, we showed that AGE increased a time dependent expression of galactin-3, Toll-like receptor-4, and nuclear factor - κB, all involved in the proinflammatory activation pathway. In vivo, AGE formed complexes with increased levels of circulating acute phase proteins (lysozyme and transferrin), products of a proinflammatory immune response, thereby demonstrating an effector response to cope with the consequences of oxidative stress. Thus, the harmful consequences of IM for animal welfare are extended here by demonstrating the activation of a resource-demanding proinflammatory response.
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Smith HJ, Sharma A, Mair WB. Metabolic Communication and Healthy Aging: Where Should We Focus Our Energy? Dev Cell 2020; 54:196-211. [PMID: 32619405 DOI: 10.1016/j.devcel.2020.06.011] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 06/01/2020] [Accepted: 06/07/2020] [Indexed: 02/09/2023]
Abstract
Aging is associated with a loss of metabolic homeostasis and plasticity, which is causally linked to multiple age-onset pathologies. The majority of the interventions-genetic, dietary, and pharmacological-that have been found to slow aging and protect against age-related disease in various organisms do so by targeting central metabolic pathways. However, targeting metabolic pathways chronically and ubiquitously makes it difficult to define the downstream effects responsible for lifespan extension and often results in negative effects on growth and health, limiting therapeutic potential. Insight into how metabolic signals are relayed between tissues, cells, and organelles opens up new avenues to target metabolic regulators locally rather than globally for healthy aging. In this review, we discuss the pro-longevity effects of targeting metabolic pathways in specific tissues and how these interventions communicate with distal cells to modulate aging. These studies may be crucial in designing interventions that promote longevity without negative health consequences.
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Affiliation(s)
- Hannah J Smith
- Harvard T.H. Chan School of Public Health, Department of Molecular Metabolism, Boston, MA, USA
| | - Arpit Sharma
- Harvard T.H. Chan School of Public Health, Department of Molecular Metabolism, Boston, MA, USA
| | - William B Mair
- Harvard T.H. Chan School of Public Health, Department of Molecular Metabolism, Boston, MA, USA.
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Hepatocellular Expression of SIRT1 and Its Effect on Hepatocellular Carcinoma Progression: A Future Therapeutic Perspective. Int J Hepatol 2020; 2020:2374615. [PMID: 32607257 PMCID: PMC7315277 DOI: 10.1155/2020/2374615] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Revised: 05/11/2020] [Accepted: 06/01/2020] [Indexed: 02/06/2023] Open
Abstract
Hepatocellular carcinoma (HCC) is an aggressive primary hepatic malignancy with a significant morbidity and mortality rate. Although chemotherapy along with surgical incision is believed to be an effective therapeutic approach, to date recurrence is being lifted a major concern. Thus, identifying another best therapeutic approach is becoming the main aim of physicians and scholars. In support of this, recently, several studies reported a significant observation of Sirtuin1 (SIRT1) overexpression in the malignant tumor cells, including HCC. As a result, they believed that overexpression of SIRT1 may have an effect on the progression of HCC by targeting growth and/or apoptotic controlling transcriptional factors/signaling pathways. Similarly, other reports confirmed that SIRT1 inhibition had a direct or indirect role in the control of tumor cell growth and metastasis. Therefore, inhibiting the expression and activity of SIRT1 might have a therapeutic effect to handle HCC. However, there are a limited number of reviews regarding the issue, and here, we summarized hepatocellular expression of SIRT1 and its role on HCC progression.
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Dahiya R, Mohammad T, Alajmi MF, Rehman MT, Hasan GM, Hussain A, Hassan MI. Insights into the Conserved Regulatory Mechanisms of Human and Yeast Aging. Biomolecules 2020; 10:E882. [PMID: 32526825 PMCID: PMC7355435 DOI: 10.3390/biom10060882] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 05/22/2020] [Accepted: 05/27/2020] [Indexed: 12/12/2022] Open
Abstract
Aging represents a significant biological process having strong associations with cancer, diabetes, and neurodegenerative and cardiovascular disorders, which leads to progressive loss of cellular functions and viability. Astonishingly, age-related disorders share several genetic and molecular mechanisms with the normal aging process. Over the last three decades, budding yeast Saccharomyces cerevisiae has emerged as a powerful yet simple model organism for aging research. Genetic approaches using yeast RLS have led to the identification of hundreds of genes impacting lifespan in higher eukaryotes. Numerous interventions to extend yeast lifespan showed an analogous outcome in multi-cellular eukaryotes like fruit flies, nematodes, rodents, and humans. We collected and analyzed a multitude of observations from published literature and provide the contribution of yeast in the understanding of aging hallmarks most applicable to humans. Here, we discuss key pathways and molecular mechanisms that underpin the evolutionarily conserved aging process and summarize the current understanding and clinical applicability of its trajectories. Gathering critical information on aging biology would pave the way for future investigation targeted at the discovery of aging interventions.
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Affiliation(s)
- Rashmi Dahiya
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi 110025, India;
| | - Taj Mohammad
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi 110025, India;
| | - Mohamed F. Alajmi
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia; (M.F.A.); (M.T.R.); (A.H.)
| | - Md. Tabish Rehman
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia; (M.F.A.); (M.T.R.); (A.H.)
| | - Gulam Mustafa Hasan
- Department of Biochemistry, College of Medicine, Prince Sattam Bin Abdulaziz University, P.O. Box 173, Al-Kharj 11942, Saudi Arabia;
| | - Afzal Hussain
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia; (M.F.A.); (M.T.R.); (A.H.)
| | - Md. Imtaiyaz Hassan
- Centre for Interdisciplinary Research in Basic Sciences, Jamia Millia Islamia, New Delhi 110025, India;
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Viscarra J, Sul HS. Epigenetic Regulation of Hepatic Lipogenesis: Role in Hepatosteatosis and Diabetes. Diabetes 2020; 69:525-531. [PMID: 32198196 PMCID: PMC7085244 DOI: 10.2337/dbi18-0032] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 01/23/2020] [Indexed: 12/31/2022]
Abstract
Hepatosteatosis, which is frequently associated with development of metabolic syndrome and insulin resistance, manifests when triglyceride (TG) input in the liver is greater than TG output, resulting in the excess accumulation of TG. Dysregulation of lipogenesis therefore has the potential to increase lipid accumulation in the liver, leading to insulin resistance and type 2 diabetes. Recently, efforts have been made to examine the epigenetic regulation of metabolism by histone-modifying enzymes that alter chromatin accessibility for activation or repression of transcription. For regulation of lipogenic gene transcription, various known lipogenic transcription factors, such as USF1, ChREBP, and LXR, interact with and recruit specific histone modifiers, directing specificity toward lipogenesis. Alteration or impairment of the functions of these histone modifiers can lead to dysregulation of lipogenesis and thus hepatosteatosis leading to insulin resistance and type 2 diabetes.
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Affiliation(s)
- Jose Viscarra
- Nutritional Science and Toxicology, University of California, Berkeley, Berkeley, CA
| | - Hei Sook Sul
- Nutritional Science and Toxicology, University of California, Berkeley, Berkeley, CA
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Radak Z, Suzuki K, Posa A, Petrovszky Z, Koltai E, Boldogh I. The systemic role of SIRT1 in exercise mediated adaptation. Redox Biol 2020; 35:101467. [PMID: 32086007 PMCID: PMC7284913 DOI: 10.1016/j.redox.2020.101467] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 02/07/2020] [Accepted: 02/13/2020] [Indexed: 12/30/2022] Open
Abstract
Cellular energy demands are readily changed during physical exercise resulting in adaptive responses by signaling proteins of metabolic processes, including the NAD+ dependent lysine deacetylase SIRT1. Regular exercise results in systemic adaptation that restores the level of SIRT1 in the kidney, liver, and brain in patients with neurodegenerative diseases, and thereby normalizes cellular metabolic processes to attenuate the severity of these diseases. In skeletal muscle, over-expression of SIRT1 results in enhanced numbers of myonuclei improves the repair process after injury and is actively involved in muscle hypertrophy by up-regulating anabolic and downregulating catabolic processes. The present review discusses the different views of SIRT1 dependent deacetylation of PGC-α.
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Affiliation(s)
- Zsolt Radak
- Research Institute of Sport Science, University of Physical Education, Budapest, Hungary; Faculty of Sport Sciences, Waseda University, Saitama, 359-1192, Japan; University of Szeged, Szeged, Hungary.
| | - Katsuhiko Suzuki
- Faculty of Sport Sciences, Waseda University, Saitama, 359-1192, Japan
| | | | | | - Erika Koltai
- Research Institute of Sport Science, University of Physical Education, Budapest, Hungary
| | - Istvan Boldogh
- Department of Microbiology and Immunology, University of Texas Medical Branch at Galveston, Galveston, TX, 77555, USA
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Sandoval-Rodriguez A, Monroy-Ramirez HC, Meza-Rios A, Garcia-Bañuelos J, Vera-Cruz J, Gutiérrez-Cuevas J, Silva-Gomez J, Staels B, Dominguez-Rosales J, Galicia-Moreno M, Vazquez-Del Mercado M, Navarro-Partida J, Santos-Garcia A, Armendariz-Borunda J. Pirfenidone Is an Agonistic Ligand for PPARα and Improves NASH by Activation of SIRT1/LKB1/pAMPK. Hepatol Commun 2020; 4:434-449. [PMID: 32140659 PMCID: PMC7049672 DOI: 10.1002/hep4.1474] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 12/10/2019] [Indexed: 12/21/2022] Open
Abstract
Nonalcoholic steatohepatitis (NASH) is recognized by hepatic lipid accumulation, inflammation, and fibrosis. No studies have evaluated the prolonged‐release pirfenidone (PR‐PFD) properties on NASH features. The aim of this study is to evaluate how PR‐PFD performs on metabolic functions, and provide insight on a mouse model of human NASH. Male C57BL/6J mice were fed with either normo diet or high‐fat/carbohydrate diet for 16 weeks and a subgroup also fed with PR‐PFD (300 mg/kg/day). An insulin tolerance test was performed at the end of treatment. Histological analysis, determination of serum hormones, adipocytokines measurement, and evaluation of proteins by western blot was performed. Molecular docking, in silico site‐directed mutagenesis, and in vitro experiments using HepG2 cultured cells were performed to validate PR‐PFD binding to peroxisome proliferator–activated receptor alpha (PPAR‐α), activation of PPAR‐α promoter, and sirtuin 1 (SIRT1) protein expression. Compared with the high‐fat group, the PR‐PFD‐treated mice displayed less weight gain, cholesterol, very low density lipoprotein and triglycerides, and showed a significant reduction of hepatic macrosteatosis, inflammation, hepatocyte ballooning, fibrosis, epididymal fat, and total adiposity. PR‐PFD restored levels of insulin, glucagon, adiponectin, and resistin along with improved insulin resistance. Noteworthy, SIRT1–liver kinase B1–phospho‐5′ adenosine monophosphate–activated protein kinase signaling and the PPAR‐α/carnitine O‐palmitoyltransferase 1/acyl‐CoA oxidase 1 pathway were clearly induced in high fat + PR‐PFD mice. In HepG2 cells incubated with palmitate, PR‐PFD induced activation and nuclear translocation of both PPARα and SIRT1, which correlated with increased SIRT1 phosphorylated in serine 47, suggesting a positive feedback loop between the two proteins. These results were confirmed with both synthetic PPAR‐α and SIRT1 activators and inhibitors. Finally, we found that PR‐PFD is a true agonist/ligand for PPAR‐α. Conclusions: PR‐PFD provided an anti‐steatogenic effect and protection for inflammation and fibrosis.
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Affiliation(s)
- Ana Sandoval-Rodriguez
- Department of Molecular Biology and Genomics Institute for Molecular Biology in Medicine and Gene Therapy Health Sciences University Center University of Guadalajara Guadalajara México
| | - Hugo Christian Monroy-Ramirez
- Department of Molecular Biology and Genomics Institute for Molecular Biology in Medicine and Gene Therapy Health Sciences University Center University of Guadalajara Guadalajara México
| | | | - Jesus Garcia-Bañuelos
- Department of Molecular Biology and Genomics Institute for Molecular Biology in Medicine and Gene Therapy Health Sciences University Center University of Guadalajara Guadalajara México
| | - Jose Vera-Cruz
- Department of Molecular Biology and Genomics Institute for Molecular Biology in Medicine and Gene Therapy Health Sciences University Center University of Guadalajara Guadalajara México
| | - Jorge Gutiérrez-Cuevas
- Department of Molecular Biology and Genomics Institute for Molecular Biology in Medicine and Gene Therapy Health Sciences University Center University of Guadalajara Guadalajara México
| | - Jorge Silva-Gomez
- Department of Molecular Biology and Genomics Institute for Molecular Biology in Medicine and Gene Therapy Health Sciences University Center University of Guadalajara Guadalajara México
| | - Bart Staels
- Institut Pasteur de Lille Universite Lille Inserm, CHU Lille U1011-EGID Lille France
| | - Jose Dominguez-Rosales
- Chronic-Degenerative Diseases Institute Health Sciences University Center University of Guadalajara Guadalajara México
| | - Marina Galicia-Moreno
- Department of Molecular Biology and Genomics Institute for Molecular Biology in Medicine and Gene Therapy Health Sciences University Center University of Guadalajara Guadalajara México
| | | | | | | | - Juan Armendariz-Borunda
- Department of Molecular Biology and Genomics Institute for Molecular Biology in Medicine and Gene Therapy Health Sciences University Center University of Guadalajara Guadalajara México.,Tecnologico de Monterrey Campus Guadalajara Zapopan México
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Meng T, Qin W, Liu B. SIRT1 Antagonizes Oxidative Stress in Diabetic Vascular Complication. Front Endocrinol (Lausanne) 2020; 11:568861. [PMID: 33304318 PMCID: PMC7701141 DOI: 10.3389/fendo.2020.568861] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Accepted: 10/21/2020] [Indexed: 12/17/2022] Open
Abstract
Diabetic mellitus (DM) is a significant public health concern worldwide with an increased incidence of morbidity and mortality, which is particularly due to the diabetic vascular complications. Several pivotal underlying mechanisms are associated with vascular complications, including hyperglycemia, mitochondrial dysfunction, inflammation, and most importantly, oxidative stress. Oxidative stress triggers defective angiogenesis, activates pro-inflammatory pathways and causes long-lasting epigenetic changes to facilitate the development of vascular complications. Therefore, therapeutic interventions targeting oxidative stress are promising to manage diabetic vascular complications. Sirtuin1 (SIRT1), a class III histone deacetylase belonging to the sirtuin family, plays critical roles in regulating metabolism and ageing-related pathological conditions, such as vascular diseases. Growing evidence has indicated that SIRT1 acts as a sensing regulator in response to oxidative stress and attenuates vascular dysfunction via cooperating with adenosine-monophosphate-activated protein kinase (AMPK) to activate antioxidant signals through various downstream effectors, including peroxisome proliferator-activated receptor-gamma co-activator 1 (PGC-1α), forkhead transcription factors (FOXOs), and peroxisome proliferative-activated receptor α (PPARα). In addition, SIRT1 interacts with hydrogen sulfide (H2S), regulates NADPH oxidase, endothelial NO synthase, and mechanistic target of rapamycin (mTOR) to suppress oxidative stress. Furthermore, mRNA expression of sirt1 is affected by microRNAs in DM. In the current review, we summarize recent advances illustrating the importance of SIRT1 in antagonizing oxidative stress. We also discuss whether modulation of SIRT1 can serve as a therapeutic strategy to treat diabetic vascular complications.
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Affiliation(s)
- Teng Meng
- Shenzhen Key Laboratory for Systemic Aging and Intervention, National Engineering Research Center for Biotechnology (Shenzhen), Medical Research Center, Shenzhen University Health Science Center, Shenzhen, China
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, China
- Guangdong Key Laboratory of Genome Stability and Human Disease Prevention, Department of Biochemistry & Molecular Biology, School of Basic Medical Sciences, Shenzhen University, Shenzhen, China
| | - Weifeng Qin
- Shenzhen Key Laboratory for Systemic Aging and Intervention, National Engineering Research Center for Biotechnology (Shenzhen), Medical Research Center, Shenzhen University Health Science Center, Shenzhen, China
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, China
| | - Baohua Liu
- Shenzhen Key Laboratory for Systemic Aging and Intervention, National Engineering Research Center for Biotechnology (Shenzhen), Medical Research Center, Shenzhen University Health Science Center, Shenzhen, China
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, China
- *Correspondence: Baohua Liu,
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Yu J, Li J, He S, Xu L, Zhang Y, Jiang H, Gong D, Gu Z. Sirt1 regulates the expression of critical metabolic genes in chicken hepatocytes. ANIMAL PRODUCTION SCIENCE 2020. [DOI: 10.1071/an18606] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Context
Studies in mammals show that SIRT1 plays an important role in many biological processes including liver metabolism through histone and non-histone deacetylation. Little is known about the function of Sirt1 in the chicken.
Aims
The current study investigated the expression pattern of Sirt1 mRNA in the chicken and its functions in the chicken liver.
Methods
In this work, we used real-time quantitative polymerase chain reaction to quantify the expression levels of Sirt1 mRNA in major chicken organs and tissue types, siRNA to knock down Sirt1 expression in primary chicken hepatocytes, RNA sequencing to identify gene-expression changes induced by Sirt1 knockdown, and analysed the function of the differentially expressed genes (DEGs) through gene ontology enrichment and Kyoto Encyclopedia of Genes and Genomes ontology analysis.
Key results
In total, 86 DEGs were found between Sirt1 knockdown and control chicken hepatocytes, of which 63 genes were downregulated and 23 genes were upregulated by Sirt1 knockdown. The Kyoto Encyclopedia of Genes and Genomes analysis showed that 24 DEGs were involved in metabolism. Seven DEGs were involved in carbohydrate and lipid metabolism.
Conclusions
The present study showed that Sirt1 regulates the expression of genes involved in carbohydrate and lipid metabolism and many other biological processes in the chicken liver.
Implications
The results of the present study imply that Sirt1 has various functions in the chicken liver and that Sirt1 plays a potentially important role in hepatic carbohydrate and lipid metabolism in the chicken.
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Wei Y, Corbalán-Campos J, Gurung R, Natarelli L, Zhu M, Exner N, Erhard F, Greulich F, Geißler C, Uhlenhaut NH, Zimmer R, Schober A. Dicer in Macrophages Prevents Atherosclerosis by Promoting Mitochondrial Oxidative Metabolism. Circulation 2019; 138:2007-2020. [PMID: 29748186 DOI: 10.1161/circulationaha.117.031589] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
BACKGROUND Alternative macrophage activation, which relies on mitochondrial oxidative metabolism, plays a central role in the resolution of inflammation and prevents atherosclerosis. Moreover, macrophages handle large amounts of cholesterol and triglycerides derived from the engulfed modified lipoproteins during atherosclerosis. Although several microRNAs regulate macrophage polarization, the role of the microRNA-generating enzyme Dicer in macrophage activation during atherosclerosis is unknown. METHODS To evaluate the role of Dicer in atherosclerosis, Apoe-/- mice with or without macrophage-specific Dicer deletion were fed a high-fat diet for 12 weeks. Anti-argonaute 2 RNA immunoprecipitation chip and RNA deep sequencing combined with microRNA functional screening were performed in the Dicer wild-type and knockout bone marrow-derived macrophages to identify the individual microRNAs and the mRNA targets mediating the phenotypic effects of Dicer. The role of the identified individual microRNA and its target in atherosclerosis was determined by tail vein injection of the target site blockers in atherosclerotic Apoe-/- mice. RESULTS We show that Dicer deletion in macrophages accelerated atherosclerosis in mice, along with enhanced inflammatory response and increased lipid accumulation in lesional macrophages. In vitro, alternative activation was limited whereas lipid-filled foam cell formation was exacerbated in Dicer-deficient macrophages as a result of impaired mitochondrial fatty acid oxidative metabolism. Rescue of microRNA (miR)-10a, let-7b, and miR-195a expression restored the oxidative metabolism in alternatively activated Dicer-deficient macrophages. Suppression of ligand-dependent nuclear receptor corepressor by miR-10a promoted fatty acid oxidation, which mediated the lipolytic and anti-inflammatory effect of Dicer. miR-10a expression was negatively correlated to the progression of atherosclerosis in humans. Blocking the interaction between ligand-dependent nuclear receptor corepressor and miR-10a by target site blockers aggravated atherosclerosis development in mice. CONCLUSIONS Dicer plays an atheroprotective role by coordinately regulating the inflammatory response and lipid metabolism in macrophages through enhancing fatty acid-fueled mitochondrial respiration, suggesting that promoting Dicer/miR-10a-dependent metabolic reprogramming in macrophages has potential therapeutic implications to prevent atherosclerosis.
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Affiliation(s)
- Yuanyuan Wei
- Experimental Vascular Medicine, Institute for Cardiovascular Prevention (Y.W., J.C.-C., R.G., L.N., M.Z., C.G., A.S.), Ludwig-Maximilians-University Munich, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Munich Heart Alliance, Germany (Y.W., A.S.)
| | - Judit Corbalán-Campos
- Experimental Vascular Medicine, Institute for Cardiovascular Prevention (Y.W., J.C.-C., R.G., L.N., M.Z., C.G., A.S.), Ludwig-Maximilians-University Munich, Germany
| | - Rashmi Gurung
- Experimental Vascular Medicine, Institute for Cardiovascular Prevention (Y.W., J.C.-C., R.G., L.N., M.Z., C.G., A.S.), Ludwig-Maximilians-University Munich, Germany
| | - Lucia Natarelli
- Experimental Vascular Medicine, Institute for Cardiovascular Prevention (Y.W., J.C.-C., R.G., L.N., M.Z., C.G., A.S.), Ludwig-Maximilians-University Munich, Germany
| | - Mengyu Zhu
- Experimental Vascular Medicine, Institute for Cardiovascular Prevention (Y.W., J.C.-C., R.G., L.N., M.Z., C.G., A.S.), Ludwig-Maximilians-University Munich, Germany
| | - Nicole Exner
- Biomedical Research Center, Biochemistry (N.E.), Ludwig-Maximilians-University Munich, Germany
| | - Florian Erhard
- Institut für Informatik (F.E., R.Z.), Ludwig-Maximilians-University Munich, Germany.,Dr Erhard is currently at the Institut für Virologie, Julius-Maximilians-Universität Würzburg, Germany
| | - Franziska Greulich
- Helmholtz Diabetes Center and German Center for Diabetes Research, IDO, Munich, Germany (F.G., N.H.U.)
| | - Claudia Geißler
- Experimental Vascular Medicine, Institute for Cardiovascular Prevention (Y.W., J.C.-C., R.G., L.N., M.Z., C.G., A.S.), Ludwig-Maximilians-University Munich, Germany
| | - N Henriette Uhlenhaut
- Helmholtz Diabetes Center and German Center for Diabetes Research, IDO, Munich, Germany (F.G., N.H.U.)
| | - Ralf Zimmer
- Institut für Informatik (F.E., R.Z.), Ludwig-Maximilians-University Munich, Germany
| | - Andreas Schober
- Experimental Vascular Medicine, Institute for Cardiovascular Prevention (Y.W., J.C.-C., R.G., L.N., M.Z., C.G., A.S.), Ludwig-Maximilians-University Munich, Germany.,DZHK (German Center for Cardiovascular Research), Partner Site Munich Heart Alliance, Germany (Y.W., A.S.)
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Elafibranor Inhibits Chronic Kidney Disease Progression in NASH Mice. BIOMED RESEARCH INTERNATIONAL 2019; 2019:6740616. [PMID: 31321239 PMCID: PMC6607733 DOI: 10.1155/2019/6740616] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Revised: 04/16/2019] [Accepted: 05/14/2019] [Indexed: 11/23/2022]
Abstract
Identification of new pharmacological approaches to inhibit the excessive fat intake-induced steatohepatitis and chronic kidney disease (CKD) is important. High-fat diet (HFD)-induced steatohepatitis and CKD share common pathogenesis involving peroxisome proliferator-activated receptor (PPAR)-α and -δ. Elafibranor, a dual PPARα/δ agonist, can ameliorate the HFD-induced steatohepatitis. Nonetheless, the effects of HFD-induced CKD had not yet explored. This study investigated the effects of elafibranor (elaf) on the progression of HFD-induced CKD in mice. In vivo and in vitro renal effects were evaluated in HFD-elaf mice receiving 12 weeks of elafibranor (from 13th to 24th week of HFD feeding) treatment. In elafibranor-treated HFD mice, increased insulin sensitivity, reduced obesity and body fat mass, decreased severity of steatohepatitis, increased renal expression of PPARα, PPARδ, SIRT1, and autophagy (Beclin-1 and LC3-II) as well as glomerular/renal tubular barrier markers [synaptopodin (podocyte marker), zona occludin-1, and cubulin], reduced renal oxidative stress and caspase-3, and less urinary 8-isoprostanes excretion were observed. Aforementioned benefits of elafibranor were associated with low renal tubular injury and tubulointerstitial fibrosis scores, less albuminuria, low urinary albumin-to-creatinine ratio, and preserved glomerular filtration rate. Acute incubation of podocytes and HK-2 cells with elafibranor or recombinant SIRT1 reversed the HFD-sera-induced oxidative stress, autophagy dysfunction, cell apoptosis, barrier marker loss, albumin endocytosis, and reuptake reduction. Besides hepatoprotective and metabolic beneficial effects, current study showed that elafibranor inhibited the progression of HFD-induced CKD through activation of renal PPARα, PPARδ, SIRT1, autophagy, reduction of oxidative stress, and apoptosis in mice with steatohepatitis.
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Yang Y, Mohammed FS, Zhang N, Sauve AA. Dihydronicotinamide riboside is a potent NAD + concentration enhancer in vitro and in vivo. J Biol Chem 2019; 294:9295-9307. [PMID: 30948509 DOI: 10.1074/jbc.ra118.005772] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Revised: 03/31/2019] [Indexed: 12/16/2022] Open
Abstract
Interest in pharmacological agents capable of increasing cellular NAD+ concentrations has stimulated investigations of nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN). NR and NMN require large dosages for effect. Herein, we describe synthesis of dihydronicotinamide riboside (NRH) and the discovery that NRH is a potent NAD+ concentration-enhancing agent, which acts within as little as 1 h after administration to mammalian cells to increase NAD+ concentrations by 2.5-10-fold over control values. Comparisons with NR and NMN show that in every instance, NRH provides greater NAD+ increases at equivalent concentrations. NRH also provides substantial NAD+ increases in tissues when administered by intraperitoneal injection to C57BL/6J mice. NRH substantially increases NAD+/NADH ratio in cultured cells and in liver and no induction of apoptotic markers or significant increases in lactate levels in cells. Cells treated with NRH are resistant to cell death caused by NAD+-depleting genotoxins such as hydrogen peroxide and methylmethane sulfonate. Studies to identify its biochemical mechanism of action showed that it does not inhibit NAD+ consumption, suggesting that it acts as a biochemical precursor to NAD+ Cell lysates possess an ATP-dependent kinase activity that efficiently converts NRH to the compound NMNH, but independent of Nrk1 or Nrk2. These studies identify a putative new metabolic pathway to NAD+ and a potent pharmacologic agent for NAD+ concentration enhancement in cells and tissues.
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Affiliation(s)
- Yue Yang
- From the Department of Pharmacology, Weill Cornell Medical College, New York, New York 10065
| | | | - Ning Zhang
- From the Department of Pharmacology, Weill Cornell Medical College, New York, New York 10065
| | - Anthony A Sauve
- From the Department of Pharmacology, Weill Cornell Medical College, New York, New York 10065
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Dong Y, Digman MA, Brewer GJ. Age- and AD-related redox state of NADH in subcellular compartments by fluorescence lifetime imaging microscopy. GeroScience 2019; 41:51-67. [PMID: 30729413 DOI: 10.1007/s11357-019-00052-8] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Accepted: 01/17/2019] [Indexed: 02/06/2023] Open
Abstract
Nicotinamide adenine dinucleotide (reduced form: NADH) serves as a vital redox-energy currency for reduction-oxidation homeostasis and fulfilling energetic demands. While NADH exists as free and bound forms, only free NADH is utilized for complex I to power oxidative phosphorylation, especially important in neurons. Here, we studied how much free NADH remains available for energy production in mitochondria of old living neurons. We hypothesize that free NADH in neurons from old mice is lower than the levels in young mice and even lower in neurons from the 3xTg-AD Alzheimer's disease (AD) mouse model. To assess free NADH, we used lifetime imaging of NADH autofluorescence with 2-photon excitation to be able to resolve the pool of NADH in mitochondria, cytoplasm, and nuclei. Primary neurons from old mice were characterized by a lower free/bound NADH ratio than young neurons from both non-transgenic (NTg) and more so in 3xTg-AD mice. Mitochondrial compartments maintained 26 to 41% more reducing NADH redox state than cytoplasm for each age, genotype, and sex. Aging diminished the mitochondrial free NADH concentration in NTg neurons by 43% and in 3xTg-AD by 50%. The lower free NADH with age suggests a decline in capacity to regenerate free NADH for energetic supply to power oxidative phosphorylation which further worsens in AD. Applying this non-invasive approach, we showed the most explicit measures yet of bioenergetic deficits in free NADH with aging at the subcellular level in live neurons from in-bred mice and an AD model.
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Affiliation(s)
- Yue Dong
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA
| | - Michelle A Digman
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA.,Laboratory of Fluorescence Dynamics, Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA
| | - Gregory J Brewer
- Department of Biomedical Engineering, University of California Irvine, Irvine, CA, USA. .,MIND Institute, Center for Neurobiology of Learning and Memory, University of California, Irvine, CA, USA.
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Cui R, Li C, Wang J, Dai J. Induction of hepatic miR-34a by perfluorooctanoic acid regulates metabolism-related genes in mice. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 244:270-278. [PMID: 30342367 DOI: 10.1016/j.envpol.2018.10.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 09/26/2018] [Accepted: 10/11/2018] [Indexed: 05/28/2023]
Abstract
Perfluorooctanoic acid (PFOA) is a widespread organic pollutant with various toxicological impacts on the liver. Members of the miR-34 family are P53-targeted growth suppressors. We found that PFOA exposure (5 mg/kg/d PFOA for 28 d) resulted in a significant increase of miR-34a in the livers of mice but had no effect on either miR-34b or miR-34c. We knocked out miR-34a in mice to explore the role of elevated miR-34a in PFOA-induced liver toxicity. Compared with the corresponding untreated control, significant increases in liver weight as well as serum alanine transaminase, aspartate aminotransferase, and cholinesterase levels were observed in miR-34a-/- and wild-type mice after PFOA exposure. Hepatic cells showed similar swelling in both miR-34a-/- and wild-type mice after PFOA treatment. Hepatic RNA-sequencing (RNA-seq) showed that PFOA led to significant alteration in lipid metabolism genes, especially those involved in the peroxisome proliferator-activated receptor pathway, in both wild-type and miR-34a null mice. With or without PFOA treatment, relatively fewer genes were altered in miR-34a-/- livers compared to wild-type livers. Among the changed genes by miR-34a, the most dominant were metabolism-related genes, such as Fabp3, Cyp7a1, and Apoa4. Our in vivo study indicated that miR-34a mainly exerts a metabolic regulation role, rather than the pro-apoptosis and cell cycle arrest role reported previously by many in vitro studies. In addition, although hepatic P53 was unchanged, the active type of P53 (acetylated P53 (acetyl-p53, Lys379)) was markedly altered under PFOA treatment. Therefore, the increase in acetylated P53 may have activated the transcription of miR-34a in mouse livers after PFOA treatment.
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Affiliation(s)
- Ruina Cui
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, PR China
| | - Chenyang Li
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, PR China
| | - Jianshe Wang
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, PR China.
| | - Jiayin Dai
- Key Laboratory of Animal Ecology and Conservation Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, PR China
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35
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Lee HJ, Yang SJ. Nicotinamide riboside regulates inflammation and mitochondrial markers in AML12 hepatocytes. Nutr Res Pract 2018; 13:3-10. [PMID: 30788050 PMCID: PMC6369115 DOI: 10.4162/nrp.2019.13.1.3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 06/06/2018] [Accepted: 10/30/2018] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND/OBJECTIVES The NAD+ precursor nicotinamide riboside (NR) is a type of vitamin B3 found in cow's milk and yeast-containing food products such as beer. Recent studies suggested that NR prevents hearing loss, high-fat diet-induced obesity, Alzheimer's disease, and mitochondrial myopathy. The objective of this study was to investigate the effects of NR on inflammation and mitochondrial biogenesis in AML12 mouse hepatocytes. MATERIALS/METHODS A subset of hepatocytes was treated with palmitic acid (PA; 250 µM) for 48 h to induce hepatocyte steatosis. The hepatocytes were treated with NR (10 µM and 10 mM) for 24 h with and without PA. The cell viability and the levels of sirtuins, inflammatory markers, and mitochondrial markers were analyzed. RESULTS Cytotoxicity of NR was examined by PrestoBlue assay. Exposure to NR had no effect on cell viability or morphology. Gene expression of sirtuin 1 (Sirt1) and Sirt3 was significantly upregulated by NR in PA-treated hepatocytes. However, Sirt1 activities were increased in hepatocytes treated with low-dose NR. Hepatic pro-inflammatory markers including tumor necrosis factor-alpha and interleukin-6 were decreased in NR-treated cells. NR upregulated anti-inflammatory molecule adiponectin, and, tended to down-regulate hepatokine fetuin-A in PA-treated hepatocytes, suggesting its inverse regulation on these cytokines. NR increased levels of mitochondrial markers including peroxisome proliferator-activated receptor γ coactivator-1α, carnitine palmitoyltransferase 1, uncoupling protein 2, transcription factor A, mitochondrial and mitochondrial DNA in PA-treated hepatocytes. CONCLUSIONS These data demonstrated that NR attenuated hepatic inflammation and increased levels of mitochondrial markers in hepatocytes.
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Affiliation(s)
- Hee Jae Lee
- Department of Food and Nutrition, Seoul Women's University, 621 Hwarangro, Nowon-Gu, Seoul 01797, Korea
| | - Soo Jin Yang
- Department of Food and Nutrition, Seoul Women's University, 621 Hwarangro, Nowon-Gu, Seoul 01797, Korea
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36
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Mac-Marcjanek K, Zieleniak A, Zurawska-Klis M, Cypryk K, Wozniak L, Wojcik M. Expression Profile of Diabetes-Related Genes Associated with Leukocyte Sirtuin 1 Overexpression in Gestational Diabetes. Int J Mol Sci 2018; 19:ijms19123826. [PMID: 30513672 PMCID: PMC6321739 DOI: 10.3390/ijms19123826] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 11/26/2018] [Accepted: 11/28/2018] [Indexed: 12/24/2022] Open
Abstract
Although compelling evidence indicates that Sirtuin 1 (SIRT1) plays a prominent role in type 2 diabetes, its relationship with gestational diabetes (GDM) remains elusive. This study was aimed at identifying diabetes-related genes and cellular pathways linked to changes of leukocyte SIRT1 expression at the time of GDM diagnosis. For this purpose, 122 GDM patients were screened for leukocyte SIRT1 expression, and two subgroups were distinguished, namely GDM/SIRT1(↑) (n = 30, p < 0.05) and GDM/SIRT1(↔) (n = 92, p > 0.05), with significant and insignificant changes in leukocyte SIRT1 expression compared to a normal glucose tolerant (NGT) group (n = 41), respectively. PCR array analysis identified 11 diabetes-related genes with at least a ± 2-fold difference in expression in GDM/SIRT1(↑) patients (n = 9) vs. NGT controls (n = 7); in addition, significant differences in the expression of four of the six investigated genes were confirmed between the entire GDM/SIRT1(↑) group and the whole NGT group (p < 0.05). Interestingly, of these four genes, only ACLY expression was found to significantly differ between GDM/SIRT1(↑) and GDM/SIRT1(↔). This study demonstrates that under hyperglycemic conditions, leukocyte SIRT1 overexpression is accompanied by an over-abundance of three transcripts and an under-abundance of another; these four govern related metabolism, inflammation, and transport functions, suggesting that such alterations might represent systemic biological adaptations with a unique ACLY under-expression in GDM/SIRT1(↑) women.
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Affiliation(s)
- Katarzyna Mac-Marcjanek
- Department of Structural Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University of Lodz, 90-752 Lodz, Poland.
| | - Andrzej Zieleniak
- Department of Structural Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University of Lodz, 90-752 Lodz, Poland.
| | - Monika Zurawska-Klis
- Diabetology and Metabolic Diseases Department, Medical University of Lodz, 92-213 Lodz.
| | - Katarzyna Cypryk
- Diabetology and Metabolic Diseases Department, Medical University of Lodz, 92-213 Lodz.
| | - Lucyna Wozniak
- Department of Structural Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University of Lodz, 90-752 Lodz, Poland.
| | - Marzena Wojcik
- Department of Structural Biology, Faculty of Biomedical Sciences and Postgraduate Education, Medical University of Lodz, 90-752 Lodz, Poland.
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37
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Kim TH, Yang YM, Han CY, Koo JH, Oh H, Kim SS, You BH, Choi YH, Park TS, Lee CH, Kurose H, Noureddin M, Seki E, Wan YJY, Choi CS, Kim SG. Gα12 ablation exacerbates liver steatosis and obesity by suppressing USP22/SIRT1-regulated mitochondrial respiration. J Clin Invest 2018; 128:5587-5602. [PMID: 30300140 DOI: 10.1172/jci97831] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Accepted: 10/02/2018] [Indexed: 12/20/2022] Open
Abstract
Nonalcoholic fatty liver disease (NAFLD) arises from mitochondrial dysfunction under sustained imbalance between energy intake and expenditure, but the underlying mechanisms controlling mitochondrial respiration have not been entirely understood. Heterotrimeric G proteins converge with activated GPCRs to modulate cell-signaling pathways to maintain metabolic homeostasis. Here, we investigated the regulatory role of G protein α12 (Gα12) on hepatic lipid metabolism and whole-body energy expenditure in mice. Fasting increased Gα12 levels in mouse liver. Gα12 ablation markedly augmented fasting-induced hepatic fat accumulation. cDNA microarray analysis from Gna12-KO liver revealed that the Gα12-signaling pathway regulated sirtuin 1 (SIRT1) and PPARα, which are responsible for mitochondrial respiration. Defective induction of SIRT1 upon fasting was observed in the liver of Gna12-KO mice, which was reversed by lentivirus-mediated Gα12 overexpression in hepatocytes. Mechanistically, Gα12 stabilized SIRT1 protein through transcriptional induction of ubiquitin-specific peptidase 22 (USP22) via HIF-1α increase. Gα12 levels were markedly diminished in liver biopsies from NAFLD patients. Consistently, Gna12-KO mice fed a high-fat diet displayed greater susceptibility to diet-induced liver steatosis and obesity due to decrease in energy expenditure. Our results demonstrate that Gα12 regulates SIRT1-dependent mitochondrial respiration through HIF-1α-dependent USP22 induction, identifying Gα12 as an upstream molecule that contributes to the regulation of mitochondrial energy expenditure.
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Affiliation(s)
- Tae Hyun Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, South Korea
| | - Yoon Mee Yang
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, South Korea.,Division of Digestive and Liver Diseases, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Chang Yeob Han
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, South Korea.,Department of Pharmacology, School of Medicine, Wonkwang University, Iksan, Jeonbuk, South Korea
| | - Ja Hyun Koo
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, South Korea
| | - Hyunhee Oh
- Korea Mouse Metabolic Phenotyping Center, Lee Gil Ya Cancer and Diabetes Institute, Gachon University of Medicine and Science, Incheon, South Korea
| | - Su Sung Kim
- Korea Mouse Metabolic Phenotyping Center, Lee Gil Ya Cancer and Diabetes Institute, Gachon University of Medicine and Science, Incheon, South Korea
| | - Byoung Hoon You
- College of Pharmacy, Dongguk University, Ilsan Dong-Gu, Goyang, Gyeoggi-Do, South Korea
| | - Young Hee Choi
- College of Pharmacy, Dongguk University, Ilsan Dong-Gu, Goyang, Gyeoggi-Do, South Korea
| | - Tae-Sik Park
- Department of Life Science, Gachon University, Seongnam, Gyeonggi-Do, South Korea
| | - Chang Ho Lee
- College of Medicine, Hanyang University, Seoul, South Korea
| | - Hitoshi Kurose
- Department of Pharmacology and Toxicology, Graduate School of Pharmaceutical Sciences, Kyushu University, Fukuoka, Japan
| | - Mazen Noureddin
- Fatty Liver Disease Program, Division of Digestive and Liver Diseases, Department of Medicine, Comprehensive Transplant Center, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Ekihiro Seki
- Division of Digestive and Liver Diseases, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Yu-Jui Yvonne Wan
- Department of Medical Pathology and Laboratory Medicine, UCD, Sacramento, California, USA
| | - Cheol Soo Choi
- Korea Mouse Metabolic Phenotyping Center, Lee Gil Ya Cancer and Diabetes Institute, Gachon University of Medicine and Science, Incheon, South Korea.,Endocrinology, Internal Medicine, Gachon University Gil Medical Center, Incheon, South Korea
| | - Sang Geon Kim
- College of Pharmacy and Research Institute of Pharmaceutical Sciences, Seoul National University, Seoul, South Korea
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38
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Mehra P, Guo Y, Nong Y, Lorkiewicz P, Nasr M, Li Q, Muthusamy S, Bradley JA, Bhatnagar A, Wysoczynski M, Bolli R, Hill BG. Cardiac mesenchymal cells from diabetic mice are ineffective for cell therapy-mediated myocardial repair. Basic Res Cardiol 2018; 113:46. [PMID: 30353243 PMCID: PMC6314032 DOI: 10.1007/s00395-018-0703-0] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 10/04/2018] [Indexed: 01/17/2023]
Abstract
Although cell therapy improves cardiac function after myocardial infarction, highly variable results and limited understanding of the underlying mechanisms preclude its clinical translation. Because many heart failure patients are diabetic, we examined how diabetic conditions affect the characteristics of cardiac mesenchymal cells (CMC) and their ability to promote myocardial repair in mice. To examine how diabetes affects CMC function, we isolated CMCs from non-diabetic C57BL/6J (CMCWT) or diabetic B6.BKS(D)-Leprdb/J (CMCdb/db) mice. When CMCs were grown in 17.5 mM glucose, CMCdb/db cells showed > twofold higher glycolytic activity and a threefold higher expression of Pfkfb3 compared with CMCWT cells; however, culture of CMCdb/db cells in 5.5 mM glucose led to metabolic remodeling characterized by normalization of metabolism, a higher NAD+/NADH ratio, and a sixfold upregulation of Sirt1. These changes were associated with altered extracellular vesicle miRNA content as well as proliferation and cytotoxicity parameters comparable to CMCWT cells. To test whether this metabolic improvement of CMCdb/db cells renders them suitable for cell therapy, we cultured CMCWT or CMCdb/db cells in 5.5 mM glucose and then injected them into infarcted hearts of non-diabetic mice (CMCWT, n = 17; CMCdb/db, n = 13; Veh, n = 14). Hemodynamic measurements performed 35 days after transplantation showed that, despite normalization of their properties in vitro, and unlike CMCWT cells, CMCdb/db cells did not improve load-dependent and -independent parameters of left ventricular function. These results suggest that diabetes adversely affects the reparative capacity of CMCs and that modulating CMC characteristics via culture in lower glucose does not render them efficacious for cell therapy.
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Affiliation(s)
- Parul Mehra
- Division of Cardiovascular Medicine, Department of Medicine, Institute of Molecular Cardiology, Envirome Institute, Diabetes and Obesity Center, University of Louisville School of Medicine, 580 S. Preston St., Rm 321E, Louisville, KY, 40202, USA
| | - Yiru Guo
- Division of Cardiovascular Medicine, Department of Medicine, Institute of Molecular Cardiology, Envirome Institute, Diabetes and Obesity Center, University of Louisville School of Medicine, 580 S. Preston St., Rm 321E, Louisville, KY, 40202, USA
| | - Yibing Nong
- Division of Cardiovascular Medicine, Department of Medicine, Institute of Molecular Cardiology, Envirome Institute, Diabetes and Obesity Center, University of Louisville School of Medicine, 580 S. Preston St., Rm 321E, Louisville, KY, 40202, USA
| | - Pawel Lorkiewicz
- Division of Cardiovascular Medicine, Department of Medicine, Institute of Molecular Cardiology, Envirome Institute, Diabetes and Obesity Center, University of Louisville School of Medicine, 580 S. Preston St., Rm 321E, Louisville, KY, 40202, USA
| | - Marjan Nasr
- Division of Cardiovascular Medicine, Department of Medicine, Institute of Molecular Cardiology, Envirome Institute, Diabetes and Obesity Center, University of Louisville School of Medicine, 580 S. Preston St., Rm 321E, Louisville, KY, 40202, USA
| | - Qianhong Li
- Division of Cardiovascular Medicine, Department of Medicine, Institute of Molecular Cardiology, Envirome Institute, Diabetes and Obesity Center, University of Louisville School of Medicine, 580 S. Preston St., Rm 321E, Louisville, KY, 40202, USA
| | - Senthilkumar Muthusamy
- Division of Cardiovascular Medicine, Department of Medicine, Institute of Molecular Cardiology, Envirome Institute, Diabetes and Obesity Center, University of Louisville School of Medicine, 580 S. Preston St., Rm 321E, Louisville, KY, 40202, USA
| | - James A Bradley
- Division of Cardiovascular Medicine, Department of Medicine, Institute of Molecular Cardiology, Envirome Institute, Diabetes and Obesity Center, University of Louisville School of Medicine, 580 S. Preston St., Rm 321E, Louisville, KY, 40202, USA
| | - Aruni Bhatnagar
- Division of Cardiovascular Medicine, Department of Medicine, Institute of Molecular Cardiology, Envirome Institute, Diabetes and Obesity Center, University of Louisville School of Medicine, 580 S. Preston St., Rm 321E, Louisville, KY, 40202, USA
| | - Marcin Wysoczynski
- Division of Cardiovascular Medicine, Department of Medicine, Institute of Molecular Cardiology, Envirome Institute, Diabetes and Obesity Center, University of Louisville School of Medicine, 580 S. Preston St., Rm 321E, Louisville, KY, 40202, USA
| | - Roberto Bolli
- Division of Cardiovascular Medicine, Department of Medicine, Institute of Molecular Cardiology, Envirome Institute, Diabetes and Obesity Center, University of Louisville School of Medicine, 580 S. Preston St., Rm 321E, Louisville, KY, 40202, USA
| | - Bradford G Hill
- Division of Cardiovascular Medicine, Department of Medicine, Institute of Molecular Cardiology, Envirome Institute, Diabetes and Obesity Center, University of Louisville School of Medicine, 580 S. Preston St., Rm 321E, Louisville, KY, 40202, USA.
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39
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de Goede P, Sen S, Su Y, Foppen E, Poirel VJ, Challet E, Kalsbeek A. An Ultradian Feeding Schedule in Rats Affects Metabolic Gene Expression in Liver, Brown Adipose Tissue and Skeletal Muscle with Only Mild Effects on Circadian Clocks. Int J Mol Sci 2018; 19:E3171. [PMID: 30326619 PMCID: PMC6214081 DOI: 10.3390/ijms19103171] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Revised: 10/04/2018] [Accepted: 10/11/2018] [Indexed: 12/21/2022] Open
Abstract
Restricted feeding is well known to affect expression profiles of both clock and metabolic genes. However, it is unknown whether these changes in metabolic gene expression result from changes in the molecular clock or in feeding behavior. Here we eliminated the daily rhythm in feeding behavior by providing 6 meals evenly distributed over the light/dark-cycle. Animals on this 6-meals-a-day feeding schedule retained the normal day/night difference in physiological parameters including body temperature and locomotor activity. The daily rhythm in respiratory exchange ratio (RER), however, was significantly phase-shifted through increased utilization of carbohydrates during the light phase and increased lipid oxidation during the dark phase. This 6-meals-a-day feeding schedule did not have a major impact on the clock gene expression rhythms in the master clock, but did have mild effects on peripheral clocks. In contrast, genes involved in glucose and lipid metabolism showed differential expression. In conclusion, eliminating the daily rhythm in feeding behavior in rats does not affect the master clock and only mildly affects peripheral clocks, but disturbs metabolic rhythms in liver, skeletal muscle and brown adipose tissue in a tissue-dependent manner. Thereby, a clear daily rhythm in feeding behavior strongly regulates timing of peripheral metabolism, separately from circadian clocks.
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Affiliation(s)
- Paul de Goede
- Laboratory of Endocrinology, Department of Clinical Chemistry, Amsterdam UMC, University of Amsterdam, Amsterdam 1105 AZ, The Netherlands.
| | - Satish Sen
- Laboratory of Endocrinology, Department of Clinical Chemistry, Amsterdam UMC, University of Amsterdam, Amsterdam 1105 AZ, The Netherlands.
- Hypothalamic Integration Mechanisms Group, Netherlands Institute for Neuroscience (NIN), Amsterdam 1105 BA, The Netherlands.
- Circadian Clocks & Metabolism Team, Institute of Cellular and Integrative Neurosciences, UPR3212, Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, Strasbourg 67000, France.
| | - Yan Su
- Laboratory of Endocrinology, Department of Clinical Chemistry, Amsterdam UMC, University of Amsterdam, Amsterdam 1105 AZ, The Netherlands.
- Hypothalamic Integration Mechanisms Group, Netherlands Institute for Neuroscience (NIN), Amsterdam 1105 BA, The Netherlands.
| | - Ewout Foppen
- Laboratory of Endocrinology, Department of Clinical Chemistry, Amsterdam UMC, University of Amsterdam, Amsterdam 1105 AZ, The Netherlands.
- Hypothalamic Integration Mechanisms Group, Netherlands Institute for Neuroscience (NIN), Amsterdam 1105 BA, The Netherlands.
| | - Vincent-Joseph Poirel
- Melatonin and Seasonal Rhythms Team, Institute of Cellular and Integrative Neurosciences, UPR3212, Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, Strasbourg 67000, France.
| | - Etienne Challet
- Circadian Clocks & Metabolism Team, Institute of Cellular and Integrative Neurosciences, UPR3212, Centre National de la Recherche Scientifique (CNRS), University of Strasbourg, Strasbourg 67000, France.
| | - Andries Kalsbeek
- Laboratory of Endocrinology, Department of Clinical Chemistry, Amsterdam UMC, University of Amsterdam, Amsterdam 1105 AZ, The Netherlands.
- Hypothalamic Integration Mechanisms Group, Netherlands Institute for Neuroscience (NIN), Amsterdam 1105 BA, The Netherlands.
- Department of Endocrinology and Metabolism, Amsterdam UMC, University of Amsterdam, Amsterdam 1105 AZ, The Netherlands.
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40
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Nordgren KKS, Hampton M, Wallace KB. Editor's Highlight: The Altered DNA Methylome of Chronic Doxorubicin Exposure in Sprague Dawley Rats. Toxicol Sci 2018; 159:470-479. [PMID: 28962528 DOI: 10.1093/toxsci/kfx150] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Doxorubicin (DOX) is a widely used treatment for human cancers, but increases the risk of life-threatening congestive heart failure (CHF). DOX-induced mitochondrial damage is cumulative and persistent, similar to that observed clinically for risk of CHF. Recent evidence suggests the persistent nature of this injury is caused by altered regulation of genes important to normal cardiac functioning. We hypothesize that chronic DOX therapy is associated with epigenetic modifications of DNA methylation status, particularly in critical regulators of mitochondrial function and capacity. Cardiac tissue from Sprague Dawley rats receiving injections of DOX (2 mg/kg, s.c.) or saline once a week for 6 weeks, followed by 5 weeks of drug-free holiday was used for Reduced Representation Bisulfite Sequencing to map specific sites of DNA methylation. Comparison of these methylomes indicated DOX exposure alters DNA methylation landscapes, and identified 14 genes with highly altered methylation status. Preliminary functional effects of DNA methylation changes were characterized by quantifying mRNA expression of selected targets (Rbm20, Nmnat2, Klhl29, Cacna1c, Scn5a.) Gene expression of Rbm20, Klhl29, and Nmnat2 were significantly altered in DOX treated animals; Klhl29 and Nmnat2 demonstrated significant decreases in protein expression corresponding to gene expression. Through an epigenotype-to-phenotype approach, this study identifies potential markers and molecular regulators of irreversible DOX-induced cardiovascular toxicity associated with clinically limiting CHF. However, none of the most prevalent genes identified directly relate to mitochondrial structure or function. Thus, the investigation fails to demonstrate a direct association between this altered methylome and persistent mitochondrionopathy associated with chronic doxorubicin cardiac toxicity.
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Affiliation(s)
- Kendra K S Nordgren
- Department of Biomedical Science, University of Minnesota Medical School Duluth Campus, Duluth, Minnesota 55812
| | - Marshall Hampton
- Department of Mathematics, University of Minnesota Duluth, Duluth, Minnesota 55812
| | - Kendall B Wallace
- Department of Biomedical Science, University of Minnesota Medical School Duluth Campus, Duluth, Minnesota 55812
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41
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Baccolo G, Stamerra G, Coppola DP, Orlandi I, Vai M. Mitochondrial Metabolism and Aging in Yeast. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2018; 340:1-33. [PMID: 30072089 DOI: 10.1016/bs.ircmb.2018.05.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Mitochondrial functionality is one of the main factors involved in cell survival, and mitochondrial dysfunctions have been identified as an aging hallmark. In particular, the insurgence of mitochondrial dysfunctions is tightly connected to mitochondrial metabolism. During aging, both mitochondrial oxidative and biosynthetic metabolisms are progressively altered, with the development of malfunctions, in turn affecting mitochondrial functionality. In this context, the relation between mitochondrial pathways and aging is evolutionarily conserved from single-celled organisms, such as yeasts, to complex multicellular organisms, such as humans. Useful information has been provided by the yeast Saccharomyces cerevisiae, which is being increasingly acknowledged as a valuable model system to uncover mechanisms underlying cellular longevity in humans. On this basis, we review the impact of specific aspects of mitochondrial metabolism on aging supported by the contributions brought by numerous studies performed employing yeast. Initially, we will focus on the tricarboxylic acid cycle and oxidative phosphorylation, describing how their modulation has consequences on cellular longevity. Afterward, we will report information regarding the importance of nicotinamide adenine dinucleotide (NAD) metabolism during aging, highlighting its relation with mitochondrial functionality. The comprehension of these key points regarding mitochondrial metabolism and their physiological importance is an essential first step for the development of therapeutic interventions that point to increase life quality during aging, therefore promoting "healthy aging," as well as lifespan itself.
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Affiliation(s)
- Giacomo Baccolo
- SYSBIO Centre for Systems Biology, Milano, Italy; Dipartimento di Biotecnologie e Bioscienze, Università di Milano-Bicocca, Milano, Italy
| | - Giulia Stamerra
- SYSBIO Centre for Systems Biology, Milano, Italy; Dipartimento di Biotecnologie e Bioscienze, Università di Milano-Bicocca, Milano, Italy
| | | | - Ivan Orlandi
- SYSBIO Centre for Systems Biology, Milano, Italy; Dipartimento di Biotecnologie e Bioscienze, Università di Milano-Bicocca, Milano, Italy
| | - Marina Vai
- SYSBIO Centre for Systems Biology, Milano, Italy; Dipartimento di Biotecnologie e Bioscienze, Università di Milano-Bicocca, Milano, Italy
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42
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Silibinin-induced autophagy mediated by PPARα-sirt1-AMPK pathway participated in the regulation of type I collagen-enhanced migration in murine 3T3-L1 preadipocytes. Mol Cell Biochem 2018; 450:1-23. [DOI: 10.1007/s11010-018-3368-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Accepted: 05/17/2018] [Indexed: 12/21/2022]
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43
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Goodman RP, Calvo SE, Mootha VK. Spatiotemporal compartmentalization of hepatic NADH and NADPH metabolism. J Biol Chem 2018; 293:7508-7516. [PMID: 29514978 PMCID: PMC5961030 DOI: 10.1074/jbc.tm117.000258] [Citation(s) in RCA: 78] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Compartmentalization is a fundamental design principle of eukaryotic metabolism. Here, we review the compartmentalization of NAD+/NADH and NADP+/NADPH with a focus on the liver, an organ that experiences the extremes of biochemical physiology each day. Historical studies of the liver, using classical biochemical fractionation and measurements of redox-coupled metabolites, have given rise to the prevailing view that mitochondrial NAD(H) pools tend to be oxidized and important for energy homeostasis, whereas cytosolic NADP(H) pools tend to be highly reduced for reductive biosynthesis. Despite this textbook view, many questions still remain as to the relative size of these subcellular pools and their redox ratios in different physiological states, and to what extent such redox ratios are simply indicators versus drivers of metabolism. By performing a bioinformatic survey, we find that the liver expresses 352 known or predicted enzymes composing the hepatic NAD(P)ome, i.e. the union of all predicted enzymes producing or consuming NADP(H) or NAD(H) or using them as a redox co-factor. Notably, less than half are predicted to be localized within the cytosol or mitochondria, and a very large fraction of these genes exhibit gene expression patterns that vary during the time of day or in response to fasting or feeding. A future challenge lies in applying emerging new genetic tools to measure and manipulate in vivo hepatic NADP(H) and NAD(H) with subcellular and temporal resolution. Insights from such fundamental studies will be crucial in deciphering the pathogenesis of very common diseases known to involve alterations in hepatic NAD(P)H, such as diabetes and fatty liver disease.
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Affiliation(s)
- Russell P Goodman
- From the Division of Gastroenterology and
- Howard Hughes Medical Institute, and Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114 and
| | - Sarah E Calvo
- Howard Hughes Medical Institute, and Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114 and
- the Broad Institute, Cambridge, Massachusetts 02142
| | - Vamsi K Mootha
- Howard Hughes Medical Institute, and Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114 and
- the Broad Institute, Cambridge, Massachusetts 02142
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Lou PH, Lucchinetti E, Scott KY, Huang Y, Gandhi M, Hersberger M, Clanachan AS, Lemieux H, Zaugg M. Alterations in fatty acid metabolism and sirtuin signaling characterize early type-2 diabetic hearts of fructose-fed rats. Physiol Rep 2018; 5:5/16/e13388. [PMID: 28830979 PMCID: PMC5582268 DOI: 10.14814/phy2.13388] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 07/24/2017] [Indexed: 01/25/2023] Open
Abstract
Despite the fact that skeletal muscle insulin resistance is the hallmark of type‐2 diabetes mellitus (T2DM), inflexibility in substrate energy metabolism has been observed in other tissues such as liver, adipose tissue, and heart. In the heart, structural and functional changes ultimately lead to diabetic cardiomyopathy. However, little is known about the early biochemical changes that cause cardiac metabolic dysregulation and dysfunction. We used a dietary model of fructose‐induced T2DM (10% fructose in drinking water for 6 weeks) to study cardiac fatty acid metabolism in early T2DM and related signaling events in order to better understand mechanisms of disease. In early type‐2 diabetic hearts, flux through the fatty acid oxidation pathway was increased as a result of increased cellular uptake (CD36), mitochondrial uptake (CPT1B), as well as increased β‐hydroxyacyl‐CoA dehydrogenase and medium‐chain acyl‐CoA dehydrogenase activities, despite reduced mitochondrial mass. Long‐chain acyl‐CoA dehydrogenase activity was slightly decreased, resulting in the accumulation of long‐chain acylcarnitine species. Cardiac function and overall mitochondrial respiration were unaffected. However, evidence of oxidative stress and subtle changes in cardiolipin content and composition were found in early type‐2 diabetic mitochondria. Finally, we observed decreased activity of SIRT1, a pivotal regulator of fatty acid metabolism, despite increased protein levels. This indicates that the heart is no longer capable of further increasing its capacity for fatty acid oxidation. Along with increased oxidative stress, this may represent one of the earliest signs of dysfunction that will ultimately lead to inflammation and remodeling in the diabetic heart.
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Affiliation(s)
- Phing-How Lou
- Department of Pharmacology, University of Alberta, Edmonton, Alberta, Canada
| | - Eliana Lucchinetti
- Department of Anesthesiology and Pain Medicine, University of Alberta, Edmonton, Alberta, Canada
| | - Katrina Y Scott
- Department of Pharmacology, University of Alberta, Edmonton, Alberta, Canada
| | - Yiming Huang
- Department of Pharmacology, University of Alberta, Edmonton, Alberta, Canada
| | - Manoj Gandhi
- Department of Pharmacology, University of Alberta, Edmonton, Alberta, Canada
| | - Martin Hersberger
- Division of Clinical Chemistry and Biochemistry, University Children's Hospital Zürich, Zurich, Switzerland
| | | | - Hélène Lemieux
- Faculty Saint-Jean, University of Alberta, Edmonton, Alberta, Canada
| | - Michael Zaugg
- Department of Pharmacology, University of Alberta, Edmonton, Alberta, Canada .,Department of Anesthesiology and Pain Medicine, University of Alberta, Edmonton, Alberta, Canada
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Morgan ET, Dempsey JL, Mimche SM, Lamb TJ, Kulkarni S, Cui JY, Jeong H, Slitt AL. Physiological Regulation of Drug Metabolism and Transport: Pregnancy, Microbiome, Inflammation, Infection, and Fasting. Drug Metab Dispos 2018. [PMID: 29514828 DOI: 10.1124/dmd.117.079905] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
This article is a report on a symposium entitled "Physiological Regulation of Drug Metabolism and Transport" sponsored by the American Society for Pharmacology and Experimental Therapeutics and held at the Experimental Biology 2017 meeting in Chicago, IL. The contributions of physiologic and pathophysiological regulation of drug-metabolizing enzymes and transporters to interindividual variability in drug metabolism are increasingly recognized but in many cases are not well understood. The presentations herein discuss the phenomenology, consequences, and mechanism of such regulation. CYP2D6 transgenic mice were used to provide insights into the mechanism of regulation of this enzyme in pregnancy, via hepatocyte nuclear factor 4α, small heterodimer partner, and retinoids. Regulation of intestinal and hepatic drug-processing enzymes by the intestinal microbiota via tryptophan and its metabolites was investigated. The potential impact of parasitic infections on human drug metabolism and clearance was assessed in mice infected with Schistosoma mansoni or Plasmodium chabaudi chabaudi AS, both of which produced widespread and profound effects on murine hepatic drug-metabolizing enzymes. Finally, the induction of Abcc drug efflux transporters by fasting was investigated. This was demonstrated to occur via a cAMP, protein kinase A/nuclear factor-E2-related factor 2/Sirtuin 1 pathway via antioxidant response elements on the Abcc genes.
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Affiliation(s)
- Edward T Morgan
- Department of Pharmacology, School of Medicine, Emory University, Atlanta, Georgia (E.T.M., S.M.M.); Department of Pathology, University of Utah, Salt Lake City, Utah (T.J.L.); Department of Pharmacy Practice and Department of Biopharmaceutical Sciences, College of Pharmacy, University of Illinois, Chicago, Illinois (H.J., J.L.D.); Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington (J.L.D., J.Y.C.); and Department of Biomedical and Pharmaceutical Sciences, University of Rhode Island, Kingston, Rhode Island (A.L.S., S.K.)
| | - Joseph L Dempsey
- Department of Pharmacology, School of Medicine, Emory University, Atlanta, Georgia (E.T.M., S.M.M.); Department of Pathology, University of Utah, Salt Lake City, Utah (T.J.L.); Department of Pharmacy Practice and Department of Biopharmaceutical Sciences, College of Pharmacy, University of Illinois, Chicago, Illinois (H.J., J.L.D.); Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington (J.L.D., J.Y.C.); and Department of Biomedical and Pharmaceutical Sciences, University of Rhode Island, Kingston, Rhode Island (A.L.S., S.K.)
| | - Sylvie M Mimche
- Department of Pharmacology, School of Medicine, Emory University, Atlanta, Georgia (E.T.M., S.M.M.); Department of Pathology, University of Utah, Salt Lake City, Utah (T.J.L.); Department of Pharmacy Practice and Department of Biopharmaceutical Sciences, College of Pharmacy, University of Illinois, Chicago, Illinois (H.J., J.L.D.); Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington (J.L.D., J.Y.C.); and Department of Biomedical and Pharmaceutical Sciences, University of Rhode Island, Kingston, Rhode Island (A.L.S., S.K.)
| | - Tracey J Lamb
- Department of Pharmacology, School of Medicine, Emory University, Atlanta, Georgia (E.T.M., S.M.M.); Department of Pathology, University of Utah, Salt Lake City, Utah (T.J.L.); Department of Pharmacy Practice and Department of Biopharmaceutical Sciences, College of Pharmacy, University of Illinois, Chicago, Illinois (H.J., J.L.D.); Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington (J.L.D., J.Y.C.); and Department of Biomedical and Pharmaceutical Sciences, University of Rhode Island, Kingston, Rhode Island (A.L.S., S.K.)
| | - Supriya Kulkarni
- Department of Pharmacology, School of Medicine, Emory University, Atlanta, Georgia (E.T.M., S.M.M.); Department of Pathology, University of Utah, Salt Lake City, Utah (T.J.L.); Department of Pharmacy Practice and Department of Biopharmaceutical Sciences, College of Pharmacy, University of Illinois, Chicago, Illinois (H.J., J.L.D.); Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington (J.L.D., J.Y.C.); and Department of Biomedical and Pharmaceutical Sciences, University of Rhode Island, Kingston, Rhode Island (A.L.S., S.K.)
| | - Julia Yue Cui
- Department of Pharmacology, School of Medicine, Emory University, Atlanta, Georgia (E.T.M., S.M.M.); Department of Pathology, University of Utah, Salt Lake City, Utah (T.J.L.); Department of Pharmacy Practice and Department of Biopharmaceutical Sciences, College of Pharmacy, University of Illinois, Chicago, Illinois (H.J., J.L.D.); Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington (J.L.D., J.Y.C.); and Department of Biomedical and Pharmaceutical Sciences, University of Rhode Island, Kingston, Rhode Island (A.L.S., S.K.)
| | - Hyunyoung Jeong
- Department of Pharmacology, School of Medicine, Emory University, Atlanta, Georgia (E.T.M., S.M.M.); Department of Pathology, University of Utah, Salt Lake City, Utah (T.J.L.); Department of Pharmacy Practice and Department of Biopharmaceutical Sciences, College of Pharmacy, University of Illinois, Chicago, Illinois (H.J., J.L.D.); Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington (J.L.D., J.Y.C.); and Department of Biomedical and Pharmaceutical Sciences, University of Rhode Island, Kingston, Rhode Island (A.L.S., S.K.)
| | - Angela L Slitt
- Department of Pharmacology, School of Medicine, Emory University, Atlanta, Georgia (E.T.M., S.M.M.); Department of Pathology, University of Utah, Salt Lake City, Utah (T.J.L.); Department of Pharmacy Practice and Department of Biopharmaceutical Sciences, College of Pharmacy, University of Illinois, Chicago, Illinois (H.J., J.L.D.); Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington (J.L.D., J.Y.C.); and Department of Biomedical and Pharmaceutical Sciences, University of Rhode Island, Kingston, Rhode Island (A.L.S., S.K.)
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Song J, Yang B, Jia X, Li M, Tan W, Ma S, Shi X, Feng L. Distinctive Roles of Sirtuins on Diabetes, Protective or Detrimental? Front Endocrinol (Lausanne) 2018; 9:724. [PMID: 30559718 PMCID: PMC6284472 DOI: 10.3389/fendo.2018.00724] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Accepted: 11/15/2018] [Indexed: 12/21/2022] Open
Abstract
Dysregulation of metabolic pathways leads to type 2 diabetes, characteristic of high glucose concentration caused by insulin resistance. The histone deacetylases sirtuins exhibit remarkable enzymatic activities. Accumulating evidence indicates that sirtuins can be pharmacologically activated to ameliorate diabetes. Here, we evaluated different roles of sirtuins (SIRT1-SIRT7) in diabetes progression and described their involvement in metabolic pathways of skeletal muscle, adipose tissue and liver. The nuclear sirtuins, SIRT1, SIRT6, and SIRT7, regulate the activity of key transcription factors and cofactors in almost all tissues with the cellular responses to energy demands. The mitochondrial sirtuins, SIRT3, SIRT4, and SIRT5, regulate the activity of mitochondrial enzymes in response to fasting and calorie restriction. Moreover, genetic polymorphisms of SIRT1 and SIRT2 have been reported to associate with diabetes development. It's worth noting that SIRT1, SIRT2, SIRT3, and SIRT6 are positive regulators of insulin resistance in most cases. In the opposite, SIRT4 and SIRT7 inhibit insulin secretion and fatty acid oxidation. Identification of SIRT1 activators for diabetes has gained wide attention, such as metformin, resveratrol, and resveratrol derivatives. Randomized, prospective, and large-scale clinical trials are warrant to uncover the responsibilities of SIRTs modulators on diabetes progress.
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Affiliation(s)
- Jie Song
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, China
- Affiliated Hospital on Integration of Chinese and Western Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Bing Yang
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, China
- Nanjing University of Chinese Medicine, Nanjing, China
| | - Xiaobin Jia
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Mingyu Li
- Nanjing University of Chinese Medicine, Nanjing, China
| | - Wei Tan
- Affiliated Hospital on Integration of Chinese and Western Medicine, Nanjing University of Chinese Medicine, Nanjing, China
| | - Shitang Ma
- Life and Health college, Anhui Science and Technology University, Fengyang, China
| | - Xinhong Shi
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, China
| | - Liang Feng
- School of Traditional Chinese Pharmacy, China Pharmaceutical University, Nanjing, China
- *Correspondence: Liang Feng
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Anderson KA, Madsen AS, Olsen CA, Hirschey MD. Metabolic control by sirtuins and other enzymes that sense NAD +, NADH, or their ratio. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2017; 1858:991-998. [PMID: 28947253 DOI: 10.1016/j.bbabio.2017.09.005] [Citation(s) in RCA: 115] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 06/06/2017] [Revised: 09/15/2017] [Accepted: 09/20/2017] [Indexed: 01/12/2023]
Abstract
NAD+ is a dinucleotide cofactor with the potential to accept electrons in a variety of cellular reduction-oxidation (redox) reactions. In its reduced form, NADH is a ubiquitous cellular electron donor. NAD+, NADH, and the NAD+/NADH ratio have long been known to control the activity of several oxidoreductase enzymes. More recently, enzymes outside those participating directly in redox control have been identified that sense these dinucleotides, including the sirtuin family of NAD+-dependent protein deacylases. In this review, we highlight examples of non-redox enzymes that are controlled by NAD+, NADH, or NAD+/NADH. In particular, we focus on the sirtuin family and assess the current evidence that the sirtuin enzymes sense these dinucleotides and discuss the biological conditions under which this might occur; we conclude that sirtuins sense NAD+, but neither NADH nor the ratio. Finally, we identify future studies that might be informative to further interrogate physiological and pathophysiological changes in NAD+ and NADH, as well as enzymes like sirtuins that sense and respond to redox changes in the cell.
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Affiliation(s)
- Kristin A Anderson
- Duke Molecular Physiology Institute and Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC 27701, United States; Department of Pharmacology & Cancer Biology, Duke University Medical Center, Durham, NC 27710, United States
| | - Andreas S Madsen
- Center for Biopharmaceuticals and Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Christian A Olsen
- Center for Biopharmaceuticals and Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, 2100 Copenhagen, Denmark
| | - Matthew D Hirschey
- Duke Molecular Physiology Institute and Sarah W. Stedman Nutrition and Metabolism Center, Duke University Medical Center, Durham, NC 27701, United States; Department of Pharmacology & Cancer Biology, Duke University Medical Center, Durham, NC 27710, United States; Department of Medicine, Duke University Medical Center, Durham, NC 27710, United States.
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Moraes RCMD, Portari GV, Ferraz ASM, da Silva TEO, Marocolo M. Effects of intermittent fasting and chronic swimming exercise on body composition and lipid metabolism. Appl Physiol Nutr Metab 2017; 42:1341-1346. [PMID: 28825965 DOI: 10.1139/apnm-2017-0435] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Intermittent fasting protocol (IFP) has been suggested as a strategy to change body metabolism and improve health. The effects of IFP seem to be similar to aerobic exercise, having a hormetic adaptation according to intensity and frequency. However, the effects of combining both interventions are still unknown. Therefore, the aim of the present study was to evaluate the effects of IFP with and without endurance-exercise training on body composition, food behavior, and lipid metabolism. Twenty-week-old Wistar rats were kept under an inverted circadian cycle of 12 h with water ad libitum and assigned to 4 different groups: control group (ad libitum feeding and sedentary), exercise group (ad libitum feeding and endurance training), intermittent fasting group (IF; intermittent fasting and sedentary), and intermittent fasting and exercise group (IFEX; intermittent fasting and endurance training). After 6 weeks, the body weight of IF and IFEX animals decreased without changes in food consumption. Yet, the body composition between the 2 groups was different, with the IFEX animals containing higher total protein and lower total fat content than the IF animals. The IFEX group also showed increases in total high-density lipoprotein cholesterol and increased intramuscular lipid content. The amount of brown adipose tissue was higher in IF and IFEX groups; however, the IFEX group showed higher expression levels of uncoupling protein 1 in this tissue, indicating a greater thermogenesis. The IFP combined with endurance training is an efficient method for decreasing body mass and altering fat metabolism, without inflicting losses in protein content.
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Affiliation(s)
- Ruan Carlos Macedo de Moraes
- a Institute of Biomedical Sciences, Department of Physiology and Biophysics, University of São Paulo, São Paulo, SP, 05508-900, Brazil
| | - Guilherme Vannucchi Portari
- b Institute of Health Sciences, Department of Nutrition, Federal University of Triângulo Mineiro, Uberaba, MG, 38025-440, Brazil
| | | | - Tiago Eugênio Oliveira da Silva
- a Institute of Biomedical Sciences, Department of Physiology and Biophysics, University of São Paulo, São Paulo, SP, 05508-900, Brazil
| | - Moacir Marocolo
- d Department of Physiology, Federal University of Juiz de Fora, Juiz de Fora, MG, 36036-900, Brazil
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Daytime restricted feeding modifies the daily regulation of fatty acid β-oxidation and the lipoprotein profile in rats. Br J Nutr 2017; 117:930-941. [PMID: 28482939 DOI: 10.1017/s0007114517000800] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Daytime restricted feeding (2 h of food access from 12.00 to 14.00 hours for 3 weeks) is an experimental protocol that modifies the relationship between metabolic networks and the circadian molecular clock. The precise anatomical locus that controls the biochemical and physiological adaptations to optimise nutrient use is unknown. We explored the changes in liver oxidative lipid handling, such as β-oxidation and its regulation, as well as adaptations in the lipoprotein profile. It was found that daytime restricted feeding promoted an elevation of circulating ketone bodies before mealtime, an altered hepatic daily rhythmicity of 14CO2 production from radioactive palmitic acid, and an up-regulation of the fatty acid oxidation activators, the α-subunit of AMP-activated protein kinase (AMPK), the deacetylase silent mating type information regulation homolog 1, and the transcriptional factor PPARγ-1α coactivator. An increased localisation of phosphorylated α-subunit of AMPK in the periportal hepatocytes was also observed. Liver hepatic lipase C, important for lipoprotein transformation, showed a change of daily phase with a peak at the time of food access. In serum, there was an increase of LDL, which was responsible for a net elevation of circulating cholesterol. We conclude that our results indicate an enhanced fasting response in the liver during daily synchronisation to food access, which involves altered metabolic and cellular control of fatty acid oxidation as well a significant elevation of serum LDL. These adaptations could be part of the metabolic input that underlies the expression of the food-entrained oscillator.
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50
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Metabolism and chromatin dynamics in health and disease. Mol Aspects Med 2017; 54:1-15. [DOI: 10.1016/j.mam.2016.09.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2016] [Revised: 09/22/2016] [Accepted: 09/27/2016] [Indexed: 01/04/2023]
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