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Kong LR, Gupta K, Wu AJ, Perera D, Ivanyi-Nagy R, Ahmed SM, Tan TZ, Tan SLW, Fuddin A, Sundaramoorthy E, Goh GS, Wong RTX, Costa ASH, Oddy C, Wong H, Patro CPK, Kho YS, Huang XZ, Choo J, Shehata M, Lee SC, Goh BC, Frezza C, Pitt JJ, Venkitaraman AR. A glycolytic metabolite bypasses "two-hit" tumor suppression by BRCA2. Cell 2024; 187:2269-2287.e16. [PMID: 38608703 DOI: 10.1016/j.cell.2024.03.006] [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: 07/17/2023] [Revised: 02/01/2024] [Accepted: 03/07/2024] [Indexed: 04/14/2024]
Abstract
Knudson's "two-hit" paradigm posits that carcinogenesis requires inactivation of both copies of an autosomal tumor suppressor gene. Here, we report that the glycolytic metabolite methylglyoxal (MGO) transiently bypasses Knudson's paradigm by inactivating the breast cancer suppressor protein BRCA2 to elicit a cancer-associated, mutational single-base substitution (SBS) signature in nonmalignant mammary cells or patient-derived organoids. Germline monoallelic BRCA2 mutations predispose to these changes. An analogous SBS signature, again without biallelic BRCA2 inactivation, accompanies MGO accumulation and DNA damage in Kras-driven, Brca2-mutant murine pancreatic cancers and human breast cancers. MGO triggers BRCA2 proteolysis, temporarily disabling BRCA2's tumor suppressive functions in DNA repair and replication, causing functional haploinsufficiency. Intermittent MGO exposure incites episodic SBS mutations without permanent BRCA2 inactivation. Thus, a metabolic mechanism wherein MGO-induced BRCA2 haploinsufficiency transiently bypasses Knudson's two-hit requirement could link glycolysis activation by oncogenes, metabolic disorders, or dietary challenges to mutational signatures implicated in cancer evolution.
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Affiliation(s)
- Li Ren Kong
- Cancer Science Institute of Singapore, Singapore 117599, Singapore; NUS Centre for Cancer Research (N2CR), National University of Singapore, Singapore 117599, Singapore; MRC Cancer Unit, University of Cambridge, Cambridge CB2 0XZ, UK; Department of Pharmacology, National University of Singapore, Singapore 117600, Singapore
| | - Komal Gupta
- Cancer Science Institute of Singapore, Singapore 117599, Singapore; MRC Cancer Unit, University of Cambridge, Cambridge CB2 0XZ, UK
| | - Andy Jialun Wu
- Cancer Science Institute of Singapore, Singapore 117599, Singapore
| | - David Perera
- MRC Cancer Unit, University of Cambridge, Cambridge CB2 0XZ, UK
| | | | - Syed Moiz Ahmed
- Cancer Science Institute of Singapore, Singapore 117599, Singapore
| | - Tuan Zea Tan
- Cancer Science Institute of Singapore, Singapore 117599, Singapore
| | - Shawn Lu-Wen Tan
- MRC Cancer Unit, University of Cambridge, Cambridge CB2 0XZ, UK; Institute of Molecular and Cell Biology (IMCB), A(∗)STAR, Singapore 138673, Singapore
| | | | | | | | | | - Ana S H Costa
- MRC Cancer Unit, University of Cambridge, Cambridge CB2 0XZ, UK
| | - Callum Oddy
- Department of Oncology, University of Cambridge, Cambridge CB2 0XZ, UK
| | - Hannan Wong
- Cancer Science Institute of Singapore, Singapore 117599, Singapore
| | - C Pawan K Patro
- Cancer Science Institute of Singapore, Singapore 117599, Singapore
| | - Yun Suen Kho
- Cancer Science Institute of Singapore, Singapore 117599, Singapore; NUS Centre for Cancer Research (N2CR), National University of Singapore, Singapore 117599, Singapore
| | - Xiao Zi Huang
- Cancer Science Institute of Singapore, Singapore 117599, Singapore; NUS Centre for Cancer Research (N2CR), National University of Singapore, Singapore 117599, Singapore
| | - Joan Choo
- Department of Medicine, National University of Singapore, Singapore 119228, Singapore
| | - Mona Shehata
- MRC Cancer Unit, University of Cambridge, Cambridge CB2 0XZ, UK; Department of Oncology, University of Cambridge, Cambridge CB2 0XZ, UK
| | - Soo Chin Lee
- Cancer Science Institute of Singapore, Singapore 117599, Singapore; NUS Centre for Cancer Research (N2CR), National University of Singapore, Singapore 117599, Singapore; Department of Medicine, National University of Singapore, Singapore 119228, Singapore
| | - Boon Cher Goh
- Cancer Science Institute of Singapore, Singapore 117599, Singapore; NUS Centre for Cancer Research (N2CR), National University of Singapore, Singapore 117599, Singapore; Department of Medicine, National University of Singapore, Singapore 119228, Singapore
| | - Christian Frezza
- MRC Cancer Unit, University of Cambridge, Cambridge CB2 0XZ, UK; University of Cologne, 50923 Köln, Germany
| | - Jason J Pitt
- Cancer Science Institute of Singapore, Singapore 117599, Singapore; NUS Centre for Cancer Research (N2CR), National University of Singapore, Singapore 117599, Singapore; Genome Institute of Singapore, A(∗)STAR, Singapore 138673, Singapore
| | - Ashok R Venkitaraman
- Cancer Science Institute of Singapore, Singapore 117599, Singapore; NUS Centre for Cancer Research (N2CR), National University of Singapore, Singapore 117599, Singapore; MRC Cancer Unit, University of Cambridge, Cambridge CB2 0XZ, UK; Institute of Molecular and Cell Biology (IMCB), A(∗)STAR, Singapore 138673, Singapore; Department of Oncology, University of Cambridge, Cambridge CB2 0XZ, UK; Department of Medicine, National University of Singapore, Singapore 119228, Singapore.
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Bellitto V, Gabrielli MG, Martinelli I, Roy P, Nittari G, Cocci P, Palermo FA, Amenta F, Micioni Di Bonaventura MV, Cifani C, Tomassoni D, Tayebati SK. Dysfunction of the Brown Adipose Organ in HFD-Obese Rats and Effect of Tart Cherry Supplementation. Antioxidants (Basel) 2024; 13:388. [PMID: 38671836 PMCID: PMC11047636 DOI: 10.3390/antiox13040388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 03/15/2024] [Accepted: 03/19/2024] [Indexed: 04/28/2024] Open
Abstract
Obesity has a great impact on adipose tissue biology, based on its function as a master regulator of energy balance. Brown adipose tissue (BAT) undergoes remodeling, and its activity declines in obese subjects due to a whitening process. The anti-obesity properties of fruit extracts have been reported. The effects of tart cherry against oxidative stress, inflammation, and the whitening process in the BAT of obese rats were investigated. Intrascapular BAT (iBAT) alterations and effects of Prunus cerasus L. were debated in rats fed for 17 weeks with a high-fat diet (DIO), in DIO supplemented with seed powder (DS), and with seed powder plus the juice (DJS) of tart cherry compared to CHOW rats fed with a normo-caloric diet. iBAT histologic observations revealed a whitening process in DIO rats that was reduced in the DS and DJS groups. A modulation of uncoupling protein-1 (UCP-1) protein and gene expression specifically were detected in the obese phenotype. An upregulation of UCP-1 and related thermogenic genes after tart cherry intake was detected compared to the DIO group. Metabolic adjustment, endoplasmic reticulum stress, protein carbonylation, and the inflammatory microenvironment in the iBAT were reported in DIO rats. The analysis demonstrated an iBAT modulation that tart cherry promoted. In addition to our previous results, these data confirm the protective impact of tart cherry consumption on obesity.
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Affiliation(s)
- Vincenzo Bellitto
- School of Medicinal Sciences and Health Products, University of Camerino, 62032 Camerino, Italy; (V.B.); (I.M.); (P.R.); (G.N.); (F.A.); (M.V.M.D.B.); (C.C.)
| | - Maria Gabriella Gabrielli
- School of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy; (M.G.G.); (P.C.); (F.A.P.); (D.T.)
| | - Ilenia Martinelli
- School of Medicinal Sciences and Health Products, University of Camerino, 62032 Camerino, Italy; (V.B.); (I.M.); (P.R.); (G.N.); (F.A.); (M.V.M.D.B.); (C.C.)
| | - Proshanta Roy
- School of Medicinal Sciences and Health Products, University of Camerino, 62032 Camerino, Italy; (V.B.); (I.M.); (P.R.); (G.N.); (F.A.); (M.V.M.D.B.); (C.C.)
| | - Giulio Nittari
- School of Medicinal Sciences and Health Products, University of Camerino, 62032 Camerino, Italy; (V.B.); (I.M.); (P.R.); (G.N.); (F.A.); (M.V.M.D.B.); (C.C.)
| | - Paolo Cocci
- School of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy; (M.G.G.); (P.C.); (F.A.P.); (D.T.)
| | - Francesco Alessandro Palermo
- School of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy; (M.G.G.); (P.C.); (F.A.P.); (D.T.)
| | - Francesco Amenta
- School of Medicinal Sciences and Health Products, University of Camerino, 62032 Camerino, Italy; (V.B.); (I.M.); (P.R.); (G.N.); (F.A.); (M.V.M.D.B.); (C.C.)
| | - Maria Vittoria Micioni Di Bonaventura
- School of Medicinal Sciences and Health Products, University of Camerino, 62032 Camerino, Italy; (V.B.); (I.M.); (P.R.); (G.N.); (F.A.); (M.V.M.D.B.); (C.C.)
| | - Carlo Cifani
- School of Medicinal Sciences and Health Products, University of Camerino, 62032 Camerino, Italy; (V.B.); (I.M.); (P.R.); (G.N.); (F.A.); (M.V.M.D.B.); (C.C.)
| | - Daniele Tomassoni
- School of Biosciences and Veterinary Medicine, University of Camerino, 62032 Camerino, Italy; (M.G.G.); (P.C.); (F.A.P.); (D.T.)
| | - Seyed Khosrow Tayebati
- School of Medicinal Sciences and Health Products, University of Camerino, 62032 Camerino, Italy; (V.B.); (I.M.); (P.R.); (G.N.); (F.A.); (M.V.M.D.B.); (C.C.)
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Kitamura Y, Oikawa S, Chang J, Mori Y, Ichihara G, Ichihara S. Carbonylated Proteins as Key Regulators in the Progression of Metabolic Syndrome. Antioxidants (Basel) 2023; 12:antiox12040844. [PMID: 37107219 PMCID: PMC10135001 DOI: 10.3390/antiox12040844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/27/2023] [Accepted: 03/28/2023] [Indexed: 04/03/2023] Open
Abstract
Based on the known role of oxidative stress in the pathogenesis and progression of metabolic syndrome, we used two-dimensional gel electrophoresis with immunochemical detection of protein carbonyls (2D-Oxyblot) to characterize the carbonylated proteins induced by oxidative stress in spontaneously hypertensive rats/NDmcr-cp (CP), an animal model of metabolic syndrome. We also profiled the proteins that showed change of expression levels in their epididymal adipose tissue at the pre-symptomatic (6-week-old) and the symptomatic (25-week-old) stages of the metabolic syndrome. Two-dimensional fluorescence difference gel electrophoresis (2D-DIGE) combined with matrix-assisted laser desorption ionization time-of-flight tandem mass spectrometry (MALDI-TOF/TOF MS) was used to analyze proteins extracted from the epididymal adipose tissue. The up-regulated proteins identified at the pre-symptomatic stage were mainly associated with ATP production and redox reaction, while the down-regulated proteins found at the symptomatic stage were involved in antioxidant activity and the tricarboxylic acid (TCA) cycle. Further analysis using the 2D-Oxyblot showed significantly high carbonylation levels of gelsolin and glycerol-3-phosphate dehydrogenase [NAD+] at the symptomatic stage. These results suggest that reduced antioxidant capacity underlies the increased oxidative stress state in the metabolic syndrome. The identified carbonylated proteins, including gelsolin, are potential targets that may act as key regulators in the progression of the metabolic syndrome.
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Affiliation(s)
- Yuki Kitamura
- Department of Molecular and Environmental Medicine, Mie University Graduate School of Medicine, Tsu 514-8507, Japan
- Department of Environmental and Preventive Medicine, Jichi Medical University School of Medicine, Shimotsuke 329-0498, Japan
| | - Shinji Oikawa
- Department of Molecular and Environmental Medicine, Mie University Graduate School of Medicine, Tsu 514-8507, Japan
| | - Jie Chang
- Graduate School of Regional Innovation Studies, Mie University, Tsu 514-8507, Japan
| | - Yurie Mori
- Department of Molecular and Environmental Medicine, Mie University Graduate School of Medicine, Tsu 514-8507, Japan
| | - Gaku Ichihara
- Department of Occupational and Environmental Health, Tokyo University of Sciences, Noda 278-8510, Japan
| | - Sahoko Ichihara
- Department of Environmental and Preventive Medicine, Jichi Medical University School of Medicine, Shimotsuke 329-0498, Japan
- Graduate School of Regional Innovation Studies, Mie University, Tsu 514-8507, Japan
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Basu T, Selman A, Reddy AP, Reddy PH. Current Status of Obesity: Protective Role of Catechins. Antioxidants (Basel) 2023; 12:antiox12020474. [PMID: 36830032 PMCID: PMC9952428 DOI: 10.3390/antiox12020474] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2022] [Revised: 01/31/2023] [Accepted: 02/08/2023] [Indexed: 02/16/2023] Open
Abstract
Obesity is a growing health concern in today's society. Current estimates indicate that obesity occurs in both adults and young people. Recent research also found that the Hispanic population in the U.S. is 1.9 times more likely to be overweight as compared to their non-Hispanic population. Obesity is a multifactorial disease that has a variety of causes. All current treatment options incorporate dietary changes aimed at establishing a negative energy balance. According to current scientific research, multiple factors are involved with the development of obesity, including genetic, biochemical, psychological, environmental, behavioral, and socio-demographic factors. The people who suffer from obesity are far more likely to suffer serious health problems, such as stroke, diabetes, lung disease, bone and joint disease, cancer, heart disease, neurological disorders, and poor mental health. Studies indicate that multiple cellular changes are implicated in the progression of obesity, mitochondrial dysfunction, deregulated microRNAs, inflammatory changes, hormonal deregulation, and others. This article highlights the role that oxidative stress plays in obesity and current obesity-prevention techniques with an emphasis on the impact of catechins to prevent and treat obesity.
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Affiliation(s)
- Tanisha Basu
- Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
| | - Ashley Selman
- Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
| | - Arubala P. Reddy
- Nutritional Sciences Department, College of Human Sciences, Texas Tech University, Lubbock, TX 79409, USA
| | - P. Hemachandra Reddy
- Department of Internal Medicine, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
- Nutritional Sciences Department, College of Human Sciences, Texas Tech University, Lubbock, TX 79409, USA
- Neurology, Departments of School of Medicine, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
- Public Health Department of Graduate School of Biomedical Sciences, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
- Department of Speech, Language and Hearing Sciences, School Health Professions, Texas Tech University Health Sciences Center, Lubbock, TX 79430, USA
- Correspondence: ; Tel.: +1-806-743-3194; Fax: +1-806-743-2334
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Gu S, Zhou Z, Zhang S, Cai Y. Advances in Anti-Diabetic Cognitive Dysfunction Effect of Erigeron Breviscapus (Vaniot) Hand-Mazz. Pharmaceuticals (Basel) 2022; 16:ph16010050. [PMID: 36678547 PMCID: PMC9867432 DOI: 10.3390/ph16010050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 12/22/2022] [Accepted: 12/24/2022] [Indexed: 12/31/2022] Open
Abstract
Diabetic cognitive dysfunction (DCD) is the decline in memory, learning, and executive function caused by diabetes. Although its pathogenesis is unclear, molecular biologists have proposed various hypotheses, including insulin resistance, amyloid β hypothesis, tau protein hyperphosphorylation hypothesis, oxidative stress and neuroinflammation. DCD patients have no particular treatment options and current pharmacological regimens are suboptimal. In recent years, Chinese medicine research has shown that herbs with multi-component, multi-pathway and multi-target synergistic activities can prevent and treat DCD. Yunnan is home to the medicinal herb Erigeron breviscapus (Vant.) Hand-Mazz. (EBHM). Studies have shown that EBHM and its active components have a wide range of pharmacological effects and applications in cognitive disorders. EBHM's anti-DCD properties have been seldom reviewed. Through a literature study, we were able to evaluate the likely pathophysiology of DCD, prescribe anti-DCD medication and better grasp EBHM's therapeutic potential. EBHM's pharmacological mechanism and active components for DCD treatment were also summarized.
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Affiliation(s)
- Shanye Gu
- The Second Clinical College, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
| | - Ziyi Zhou
- The Second Clinical College, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
- Department of Neurology, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou 510120, China
- Guangdong Provincial Key Laboratory of Research on Emergency in Traditional Chinese Medicine, Guangzhou 510120, China
| | - Shijie Zhang
- The Second Clinical College, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
- Department of Neurology, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou 510120, China
- Guangdong Provincial Key Laboratory of Research on Emergency in Traditional Chinese Medicine, Guangzhou 510120, China
| | - Yefeng Cai
- The Second Clinical College, Guangzhou University of Chinese Medicine, Guangzhou 510006, China
- Department of Neurology, Guangdong Provincial Hospital of Chinese Medicine, Guangzhou 510120, China
- Guangdong Provincial Key Laboratory of Research on Emergency in Traditional Chinese Medicine, Guangzhou 510120, China
- Correspondence: ; Tel.: +86-136-3133-3842
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ALDH2 deficiency increases susceptibility to binge alcohol-induced gut leakiness, endotoxemia, and acute liver injury in mice through the gut-liver axis. Redox Biol 2022; 59:102577. [PMID: 36528936 PMCID: PMC9792909 DOI: 10.1016/j.redox.2022.102577] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 12/07/2022] [Accepted: 12/12/2022] [Indexed: 12/14/2022] Open
Abstract
Mitochondrial aldehyde dehydrogenase 2 (ALDH2) is the major enzyme responsible for metabolizing toxic acetaldehyde to acetate and acts as a protective or defensive protein against various disease states associated with alcohol use disorder (AUD), including alcohol-related liver disease (ARLD). We hypothesized that Aldh2-knockout (KO) mice are more susceptible to binge alcohol-mediated liver injury than wild-type (WT) mice through increased oxidative stress, gut leakiness and endotoxemia. Therefore, this study aimed to investigate the protective role of ALDH2 in binge alcohol-induced gut permeability, endotoxemia, and acute inflammatory liver injury by exposing Aldh2-KO or WT mice to a single oral dose of binge alcohol 3.5, 4.0, or 5.0 g/kg. Our findings showed for the first time that ALDH2 deficiency in Aldh2-KO mice increases their sensitivity to binge alcohol-induced oxidative and nitrative stress, enterocyte apoptosis, and nitration of gut tight junction (TJ) and adherent junction (AJ) proteins, leading to their degradation. These resulted in gut leakiness and endotoxemia in Aldh2-KO mice after exposure to a single dose of ethanol even at 3.5 g/kg, while no changes were observed in the corresponding WT mice. The elevated serum endotoxin (lipopolysaccharide, LPS) and bacterial translocation contributed to systemic inflammation, hepatocyte apoptosis, and subsequently acute liver injury through the gut-liver axis. Treatment with Daidzin, an ALDH2 inhibitor, exacerbated ethanol-induced cell permeability and reduced TJ/AJ proteins in T84 human colon cells. These changes were reversed by Alda-1, an ALDH2 activator. Furthermore, CRISPR/Cas9-mediated knockout of ALDH2 in T84 cells increased alcohol-mediated cell damage and paracellular permeability. All these findings demonstrate the critical role of ALDH2 in alcohol-induced epithelial barrier dysfunction and suggest that ALDH2 deficiency or gene mutation in humans is a risk factor for alcohol-mediated gut and liver injury, and that ALDH2 could be an important therapeutic target against alcohol-associated tissue or organ damage.
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Zhang S, Sun Z, Jiang X, Lu Z, Ding L, Li C, Tian X, Wang Q. Ferroptosis increases obesity: Crosstalk between adipocytes and the neuroimmune system. Front Immunol 2022; 13:1049936. [PMID: 36479119 PMCID: PMC9720262 DOI: 10.3389/fimmu.2022.1049936] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 11/07/2022] [Indexed: 11/22/2022] Open
Abstract
Ferroptosis requires not only the accumulation of iron ions, but also changes in many ferroptosis-related regulators, including a decrease in GPX4 and inhibition of SLC7A11 for classical ferroptosis, a deletion of FSP1 or GCH1. Surprisingly, adipose tissue (AT) in the obesity conditions is also accompanied by iron buildup, decreased GSH, and increased ROS. On the neurological side, the pro-inflammatory factor released by AT may have first caused ferroptosis in the vagus nerve by inhibiting of the NRF2-GPX4 pathway, resulting in disorders of the autonomic nervous system. On the immune side, obesity may cause M2 macrophages ferroptosis due to damage to iron-rich ATMs (MFehi) and antioxidant ATMs (Mox), and lead to Treg cells ferroptosis through reductions in NRF2, GPX4, and GCH1 levels. At the same time, the reduction in GPX4 may also trigger the ferroptosis of B1 cells. In addition, some studies have also found the role of GPX4 in neutrophil autophagy, which is also worth pondering whether there is a connection with ferroptosis. In conclusion, this review summarizes the associations between neuroimmune regulation associated with obesity and ferroptosis, and on the basis of this, highlights their potential molecular mechanisms, proposing that ferroptosis in one or more cells in a multicellular tissue changes the fate of that tissue.
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Affiliation(s)
| | | | | | | | | | | | - Xuewen Tian
- *Correspondence: Xuewen Tian, ; Qinglu Wang,
| | - Qinglu Wang
- *Correspondence: Xuewen Tian, ; Qinglu Wang,
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Narasimhan A, Flores RR, Camell CD, Bernlohr DA, Robbins PD, Niedernhofer LJ. Cellular Senescence in Obesity and Associated Complications: a New Therapeutic Target. Curr Diab Rep 2022; 22:537-548. [PMID: 36239841 PMCID: PMC10123542 DOI: 10.1007/s11892-022-01493-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 08/11/2022] [Indexed: 01/13/2023]
Abstract
PURPOSE OF REVIEW Obesity has increased worldwide recently and represents a major global health challenge. This review focuses on the obesity-associated cellular senescence in various organs and the role of these senescent cells (SnCs) in driving complications associated with obesity. Also, the ability to target SnCs pharmacologically with drugs termed senotherapeutics as a therapy for these complications is discussed. RECENT FINDINGS Several studies have shown a positive correlation between obesity and SnC burden in organs such as adipose tissue, liver, and pancreatic-β-cells. These SnCs produce several secretory factors which affect other cells and tissues in a paracrine manner resulting in organ dysfunction. The accumulation of SnCs in adipocytes affects their lipid storage and impairs adipogenesis. The inflammatory senescence-associated secretory phenotype (SASP) of SnCs downregulates the antioxidant capacity and mitochondrial function in tissues. Senescent hepatocytes cannot oxidize fatty acids, which leads to lipid deposition and senescence in β-cells decrease function. These and other adverse effects of SnCs contribute to insulin resistance and type-2 diabetes. The reduction in the SnC burden genetically or pharmacologically improves the complications associated with obesity. The accumulation of SnCs with age and disease accelerates aging. Obesity is a key driver of SnC accumulation, and the complications associated with obesity can be controlled by reducing the SnC burden. Thus, senotherapeutic drugs have the potential to be an effective therapeutic option.
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Affiliation(s)
- Akilavalli Narasimhan
- Institute On the Biology of Aging and Metabolism, Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church Street, SE, Minneapolis, MN, 55455, USA
| | - Rafael R Flores
- Institute On the Biology of Aging and Metabolism, Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church Street, SE, Minneapolis, MN, 55455, USA
| | - Christina D Camell
- Institute On the Biology of Aging and Metabolism, Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church Street, SE, Minneapolis, MN, 55455, USA
| | - David A Bernlohr
- Institute On the Biology of Aging and Metabolism, Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church Street, SE, Minneapolis, MN, 55455, USA
| | - Paul D Robbins
- Institute On the Biology of Aging and Metabolism, Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church Street, SE, Minneapolis, MN, 55455, USA.
| | - Laura J Niedernhofer
- Institute On the Biology of Aging and Metabolism, Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church Street, SE, Minneapolis, MN, 55455, USA.
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Klein L, Phillips D, Kong F, Bowker B, Mohan A. 4-Oxo-2-nonenal (4-ONE)-Induced Degradation of Bovine Skeletal Muscle Proteins. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:12641-12650. [PMID: 36129340 DOI: 10.1021/acs.jafc.2c05550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Lipids are an important component of meat, as they provide desirable sensory characteristics and nutritional benefits. However, lipids are susceptible to degradation through oxidation and produce toxic oxidative byproducts. 4-Oxo-2-nonenal (4-ONE) is an oxidative byproduct that is highly reactive and cytotoxic. In this study, we investigated the influence of 4-ONE-induced protein degradation on fresh and gastric digested bovine skeletal muscle proteins. The results indicated that 4-ONE naturally forms in fresh muscle proteins. We report here for the first time that 4-ONE causes severe degradation of bovine skeletal muscle proteins. An SDS-PAGE gel analysis showed evidence that the skeletal muscle proteins attenuated over the incubation time, as the density of the protein bands faded significantly after 120 h. Additionally, protein and band density analyses showed a significant decrease in protein abundance and band densities throughout the incubation time. This study revealed that the lipid oxidation byproduct, 4-oxo-2-nonenal (4-ONE) is responsible for causing skeletal muscle protein degradation. Future studies should assess the bioprotective role of antioxidants and other food ingredients for their potential to prevent the formation and/or detoxification of 4-ONE in meat.
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Affiliation(s)
- Loren Klein
- Department of Food Science and Technology, University of Georgia, Athens, Georgia 30602, United States
| | - Dennis Phillips
- Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, United States
| | - Fanbin Kong
- Department of Food Science and Technology, University of Georgia, Athens, Georgia 30602, United States
| | - Brian Bowker
- U.S. National Poultry Research Center, USDA-ARS, 950 College Station Rd., Athens, Georgia 30605, United States
| | - Anand Mohan
- Department of Food Science and Technology, University of Georgia, Athens, Georgia 30602, United States
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Hertzel AV, Yong J, Chen X, Bernlohr DA. Immune Modulation of Adipocyte Mitochondrial Metabolism. Endocrinology 2022; 163:6618136. [PMID: 35752995 PMCID: PMC9653008 DOI: 10.1210/endocr/bqac094] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Indexed: 11/19/2022]
Abstract
Immune cells infiltrate adipose tissue as a function of age, sex, and diet, leading to a variety of regulatory processes linked to metabolic disease and dysfunction. Cytokines and chemokines produced by resident macrophages, B cells, T cells and eosinophils play major role(s) in fat cell mitochondrial functions modulating pyruvate oxidation, electron transport and oxidative stress, branched chain amino acid metabolism, fatty acid oxidation, and apoptosis. Indeed, cytokine-dependent downregulation of numerous genes affecting mitochondrial metabolism is strongly linked to the development of the metabolic syndrome, whereas the potentiation of mitochondrial metabolism represents a counterregulatory process improving metabolic outcomes. In contrast, inflammatory cytokines activate mitochondrially linked cell death pathways such as apoptosis, pyroptosis, necroptosis, and ferroptosis. As such, the adipocyte mitochondrion represents a major intersection point for immunometabolic regulation of central metabolism.
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Affiliation(s)
- Ann V Hertzel
- Department of Biochemistry, Molecular Biology and Biophysics, The University of Minnesota, Minneapolis, MN 55455, USA
| | - Jeongsik Yong
- Department of Biochemistry, Molecular Biology and Biophysics, The University of Minnesota, Minneapolis, MN 55455, USA
| | - Xiaoli Chen
- Department of Food Science and Nutrition, The University of Minnesota, Minneapolis, MN 55455, USA
| | - David A Bernlohr
- Correspondence: David A. Bernlohr, PhD, Department of Biochemistry, Molecular Biology and Biophysics, The University of Minnesota, Minneapolis, MN 55455, USA.
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11
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Mohan A, Kafle D, Singh RK, Hung YC. Effects of 4-Oxo-2-nonenal on biochemical properties of bovine heart mitochondria. Food Sci Nutr 2022; 10:1830-1840. [PMID: 35702292 PMCID: PMC9179123 DOI: 10.1002/fsn3.2799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 01/10/2022] [Accepted: 02/11/2022] [Indexed: 11/20/2022] Open
Abstract
The effects of lipid peroxidation products 4‐Hydroxy‐2‐nonenal (4‐HNE) and 4‐oxo‐2‐nonenal (4‐ONE) were evaluated using bovine heart mitochondria. Oxygen consumption rate (OCR), ultrastructure, antioxidant activity, and membrane permeability were examined to compare their effects on isolated mitochondria from beef cardiac muscle. For the mitochondrial morphology, the final concentration of mitochondria and 4‐ONE or 4‐HNE in the reaction tube were 10 mg/ml and 1 mM, respectively. For the OCR experiment, mitochondria (2.5 mg/ml) were incubated with 0.20 mM ONE or in a Clark electrode chamber at 25°C. Mitochondrial membrane permeability was determined by incubating 0.5 mg/ml of mitochondrial protein with either 0.05 mM ONE or HNE or ethanol control at pH 5.6 and 7.4 at 25°C. Transmission electron microscopy (TEM) revealed that the size of 4‐ONE treated mitochondria at pH 7.4 increased (p < .05), as did permeability (p < .05), unlike ethanol controls. However, mitochondria incubated with 4‐ONE at pH 5.6 showed a decrease in volume (p < .05). Incubating mitochondria with 4‐ONE at pH 5.6 and pH increased oxygen consumption rate 7.4 caused less oxygen consumption than either 4‐HNE treatment or ethanol control. The hydrogen peroxide assay (H2O2), ferric reducing antioxidant properties (FRAP), and 2,2’‐azinobis (3‐ethylbenzthiazoline‐6‐sulfonic acid) (ABTS.+) assays revealed that 4‐ONE is a more potent inhibitor of the endogenous antioxidant system of mitochondria than 4‐HNE (p < .05).
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Affiliation(s)
- Anand Mohan
- Department of Food Science and Technology College of Agricultural and Environmental Science University of Georgia Athens Georgia USA
| | - Deepak Kafle
- Department of Food Science and Technology College of Agricultural and Environmental Science University of Georgia Athens Georgia USA
| | - Rakesh K Singh
- Department of Food Science and Technology College of Agricultural and Environmental Science University of Georgia Athens Georgia USA
| | - Yen-Con Hung
- Department of Food Science and Technology College of Agricultural and Environmental Science University of Georgia Athens Georgia USA
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12
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Schwärzler J, Mayr L, Radlinger B, Grabherr F, Philipp M, Texler B, Grander C, Ritsch A, Hunjadi M, Enrich B, Salzmann K, Ran Q, Huber LA, Tilg H, Kaser S, Adolph TE. Adipocyte GPX4 protects against inflammation, hepatic insulin resistance and metabolic dysregulation. Int J Obes (Lond) 2022; 46:951-959. [PMID: 35031697 DOI: 10.1038/s41366-022-01064-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Revised: 12/14/2021] [Accepted: 01/04/2022] [Indexed: 12/14/2022]
Abstract
OBJECTIVES Metabolic inflammation is a hallmark of obesity and related disorders, afflicting substantial morbidity and mortality to individuals worldwide. White visceral and subcutaneous adipose tissue not only serves as energy storage but also controls metabolism. Adipose tissue inflammation, commonly observed in human obesity, is considered a critical driver of metabolic perturbation while molecular hubs are poorly explored. Metabolic stress evoked by e.g. long-chain fatty acids leads to oxidative perturbation of adipocytes and production of inflammatory cytokines, fuelling macrophage infiltration and systemic low-grade inflammation. Glutathione peroxidase 4 (GPX4) protects against lipid peroxidation, accumulation of oxygen-specific epitopes and cell death, collectively referred to as ferroptosis. Here, we explore the function of adipocyte GPX4 in mammalian metabolism. METHODS We studied the regulation and function of GPX4 in differentiated mouse adipocytes derived from 3T3-L1 fibroblasts. We generated two conditional adipocyte-specific Gpx4 knockout mice by crossing Gpx4fl/fl mice with Adipoq-Cre+ (Gpx4-/-AT) or Fabp4-Cre+ (Gpx4+/-Fabp4) mice. Both models were metabolically characterized by a glucose tolerance test and insulin resistance test, and adipose tissue lipid peroxidation, inflammation and cell death were assessed by quantifying oxygen-specific epitopes, transcriptional analysis of chemokines, quantification of F4/80+ macrophages and TUNEL labelling. RESULTS GPX4 expression was induced during and required for adipocyte differentiation. In mature adipocytes, impaired GPX4 activity spontaneously evoked lipid peroxidation and expression of inflammatory cytokines such as TNF-α, interleukin 1β (IL-1β), IL-6 and the IL-8 homologue CXCL1. Gpx4-/-AT mice spontaneously displayed adipocyte hypertrophy on a chow diet, which was paralleled by the accumulation of oxygen-specific epitopes and macrophage infiltration in adipose tissue. Furthermore, Gpx4-/-AT mice spontaneously developed glucose intolerance, hepatic insulin resistance and systemic low-grade inflammation, when compared to wildtype littermates, which was similarly recapitulated in Gpx4+/-Fabp4 mice. Gpx4-/-AT mice exhibited no signs of adipocyte death. CONCLUSION Adipocyte GPX4 protects against spontaneous metabolic dysregulation and systemic low-grade inflammation independent from ferroptosis, which could be therapeutically exploited in the future.
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Affiliation(s)
- Julian Schwärzler
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Lisa Mayr
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Bernhard Radlinger
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Felix Grabherr
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Maureen Philipp
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Bernhard Texler
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Christoph Grander
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Andreas Ritsch
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Monika Hunjadi
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Barbara Enrich
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Karin Salzmann
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Qitao Ran
- Department of Cell Systems and Anatomy, UT Health San Antonio, San Antonio, TX, USA
| | - Lukas A Huber
- Institute of Cell Biology, Biocenter, Medical University of Innsbruck, Innsbruck, Austria
| | - Herbert Tilg
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Susanne Kaser
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria
| | - Timon E Adolph
- Department of Internal Medicine I, Gastroenterology, Hepatology & Endocrinology, Medical University of Innsbruck, Innsbruck, Austria.
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13
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Tauc M, Cougnon M, Carcy R, Melis N, Hauet T, Pellerin L, Blondeau N, Pisani DF. The eukaryotic initiation factor 5A (eIF5A1), the molecule, mechanisms and recent insights into the pathophysiological roles. Cell Biosci 2021; 11:219. [PMID: 34952646 PMCID: PMC8705083 DOI: 10.1186/s13578-021-00733-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 12/14/2021] [Indexed: 11/29/2022] Open
Abstract
Since the demonstration of its involvement in cell proliferation, the eukaryotic initiation factor 5A (eIF5A) has been studied principally in relation to the development and progression of cancers in which the isoform A2 is mainly expressed. However, an increasing number of studies report that the isoform A1, which is ubiquitously expressed in normal cells, exhibits novel molecular features that reveal its new relationships between cellular functions and organ homeostasis. At a first glance, eIF5A can be regarded, among other things, as a factor implicated in the initiation of translation. Nevertheless, at least three specificities: (1) its extreme conservation between species, including plants, throughout evolution, (2) its very special and unique post-translational modification through the activating-hypusination process, and finally (3) its close relationship with the polyamine pathway, suggest that the role of eIF5A in living beings remains to be uncovered. In fact, and beyond its involvement in facilitating the translation of proteins containing polyproline residues, eIF5A is implicated in various physiological processes including ischemic tolerance, metabolic adaptation, aging, development, and immune cell differentiation. These newly discovered physiological properties open up huge opportunities in the clinic for pathologies such as, for example, the ones in which the oxygen supply is disrupted. In this latter case, organ transplantation, myocardial infarction or stroke are concerned, and the current literature defines eIF5A as a new drug target with a high level of potential benefit for patients with these diseases or injuries. Moreover, the recent use of genomic and transcriptomic association along with metadata studies also revealed the implication of eIF5A in genetic diseases. Thus, this review provides an overview of eIF5A from its molecular mechanism of action to its physiological roles and the clinical possibilities that have been recently reported in the literature.
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Affiliation(s)
- Michel Tauc
- LP2M, CNRS, Université Côte d'Azur, Nice, France. .,Laboratories of Excellence Ion Channel Science and Therapeutics, Nice, France. .,Laboratoire de Physiomédecine Moléculaire, UMR7370, Faculté de Médecine, CNRS, Université Côte d'Azur, 28 Avenue de Valombrose, 06107, Nice Cedex, France.
| | - Marc Cougnon
- LP2M, CNRS, Université Côte d'Azur, Nice, France.,Laboratories of Excellence Ion Channel Science and Therapeutics, Nice, France
| | - Romain Carcy
- Service de Réanimation Polyvalente et Service de Réanimation des Urgences Vitales, CHU Nice, Hôpital Pasteur 2, Nice, France
| | - Nicolas Melis
- Laboratory of Cellular and Molecular Biology, Center for Cancer Research, National Cancer Institute, Bethesda, MD, 20892, USA
| | - Thierry Hauet
- INSERM, IRTOMIT, CHU de Poitiers, Université de Poitiers, La Milétrie, Poitiers, France
| | - Luc Pellerin
- INSERM, IRTOMIT, CHU de Poitiers, Université de Poitiers, La Milétrie, Poitiers, France
| | - Nicolas Blondeau
- Laboratories of Excellence Ion Channel Science and Therapeutics, Nice, France.,IPMC, CNRS, Université Côte d'Azur, Valbonne, France
| | - Didier F Pisani
- LP2M, CNRS, Université Côte d'Azur, Nice, France.,Laboratories of Excellence Ion Channel Science and Therapeutics, Nice, France
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14
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Kalezic A, Udicki M, Srdic Galic B, Aleksic M, Korac A, Jankovic A, Korac B. Redox profile of breast tumor and associated adipose tissue in premenopausal women - Interplay between obesity and malignancy. Redox Biol 2021; 41:101939. [PMID: 33765617 PMCID: PMC8008245 DOI: 10.1016/j.redox.2021.101939] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 03/04/2021] [Accepted: 03/06/2021] [Indexed: 12/13/2022] Open
Abstract
One of the underlying mechanisms that could link breast cancer and obesity is shifted redox homeostasis in the tumor microenvironment. To reveal the relationship between the malignant phenotype and obesity, we compared redox profiles of breast tumor and tumor-associated adipose tissue from premenopausal women: normal-weight with benign tumors, overweight/obese with benign tumors, normal-weight with malignant tumors, and overweight/obese with malignant tumors. Namely, we examined the protein expression of nuclear factor erythroid 2-related factor 2 (Nrf2), protein expression and activity of main antioxidant defense (AD) enzymes: copper, zinc- and manganese superoxide dismutase, catalase, and glutathione peroxidase, as well as the level of 4-hydroxy-2-nonenal (4-HNE) modified proteins. Higher protein expression and activity of AD enzymes were found in malignant tumor tissue than benign tumor tissue, irrespective of obesity. Nevertheless, malignant tumor tissue of overweight/obese women was characterized by higher protein expression of Nrf2 and weaker immunopositivity for 4-HNE modified proteins. In malignant tumor-associated adipose tissue, the redox profile was clearly related to obesity. Higher Nrf2 protein expression and higher AD enzyme levels were observed in normal-weight women, while stronger immunopositivity for 4-HNE modified proteins was found in overweight/obese women. The results suggest that the complex interplay between obesity and malignancy involves redox-sensitive pathways in breast tumor and tumor-associated adipose tissue. In malignant breast tumor tissue, antioxidant defense enzyme levels are not related to obesity. In malignant tumor-associated adipose tissue, redox profile is related to obesity. Nrf2 contributes to the “activated” phenotype of adipose tissue in malignancy.
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Affiliation(s)
- Andjelika Kalezic
- Institute for Biological Research "Sinisa Stankovic" - National Institute of Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Mirjana Udicki
- Faculty of Medicine, University of Novi Sad, Novi Sad, Serbia
| | | | - Marija Aleksic
- Faculty of Biology, University of Belgrade, Belgrade, Serbia
| | | | - Aleksandra Jankovic
- Institute for Biological Research "Sinisa Stankovic" - National Institute of Republic of Serbia, University of Belgrade, Belgrade, Serbia
| | - Bato Korac
- Institute for Biological Research "Sinisa Stankovic" - National Institute of Republic of Serbia, University of Belgrade, Belgrade, Serbia; Faculty of Biology, University of Belgrade, Belgrade, Serbia.
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15
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Zhou Y, Li H, Xia N. The Interplay Between Adipose Tissue and Vasculature: Role of Oxidative Stress in Obesity. Front Cardiovasc Med 2021; 8:650214. [PMID: 33748199 PMCID: PMC7969519 DOI: 10.3389/fcvm.2021.650214] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2021] [Accepted: 02/10/2021] [Indexed: 12/15/2022] Open
Abstract
Cardiovascular diseases (CVDs) rank the leading cause of morbidity and mortality globally. Obesity and its related metabolic syndrome are well-established risk factors for CVDs. Therefore, understanding the pathophysiological role of adipose tissues is of great importance in maintaining cardiovascular health. Oxidative stress, characterized by excessive formation of reactive oxygen species, is a common cellular stress shared by obesity and CVDs. While plenty of literatures have illustrated the vascular oxidative stress, very few have discussed the impact of oxidative stress in adipose tissues. Adipose tissues can communicate with vascular systems, in an endocrine and paracrine manner, through secreting several adipocytokines, which is largely dysregulated in obesity. The aim of this review is to summarize current understanding of the relationship between oxidative stress in obesity and vascular endothelial dysfunction. In this review, we briefly describe the possible causes of oxidative stress in obesity, and the impact of obesity-induced oxidative stress on adipose tissue function. We also summarize the crosstalk between adipose tissue and vasculature mediated by adipocytokines in vascular oxidative stress. In addition, we highlight the potential target mediating adipose tissue oxidative stress.
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Affiliation(s)
- Yawen Zhou
- Department of Pharmacology, Johannes Gutenberg University Medical Center, Mainz, Germany
| | - Huige Li
- Department of Pharmacology, Johannes Gutenberg University Medical Center, Mainz, Germany
| | - Ning Xia
- Department of Pharmacology, Johannes Gutenberg University Medical Center, Mainz, Germany
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16
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Antioxidant Activity of Sprouts Extracts Is Correlated with Their Anti-Obesity and Anti-Inflammatory Effects in High-Fat Diet-Fed Mice. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2021; 2021:8367802. [PMID: 33643424 PMCID: PMC7902152 DOI: 10.1155/2021/8367802] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 01/22/2021] [Accepted: 01/30/2021] [Indexed: 01/24/2023]
Abstract
Obesity is closely associated with oxidative stress and chronic inflammation leading to related metabolic diseases. Some natural extracts or polyphenols reportedly possess anti-obesity and anti-inflammatory effects as well as antioxidant activity. In this study, we assessed the correlations between the antioxidant, anti-obesity, and anti-inflammatory activities of plant extracts with potent antioxidant activity in diet-induced obese mice. Sprouts of Cedrela sinensis (CS) and Oenothera biennis L. (OB) were selected as the most potent antioxidant plant based on analysis of in vitro antioxidant activity of the extracts of ten different edible plants. C57BL/6 mice were fed with a high-fat diet (HFD) and orally treated with 50% ethanol extract of CS or OB at 50 or 100 mg/kg body weight 5 days a week for 14 weeks. Body weight gain, weight of adipose tissue, adipocyte size, and levels of lipid metabolism, inflammation, and oxidative stress markers were investigated. The CS or OB extract reduced body weight gain, visceral adipose tissue weight, adipocyte size, and plasma leptin levels, and expressions of adipogenic genes (PPARγ and fatty acid synthase) in the adipose tissue and liver of HFD-fed mice. Both extracts also reduced mRNA levels of pro-inflammatory cytokines (IL-6 and TNF-α) and oxidative stress-related genes (heme oxygenase- (HO-) 1 and p40phox). Body weight gain of mice was significantly correlated with visceral adipose tissue weight and adipocyte size. Body weight gain and adipocyte size were significantly correlated with plasma total cholesterol and 8-epi PGF2α levels, mRNA levels of leptin, HO-1, p40phox, and CD-11 in the adipose tissue, and mRNA levels of TNF-α in the adipose tissue and liver. These results suggest that the CS and OB extracts with potent antioxidant activity may inhibit fat deposition in adipose tissue and subsequent inflammation.
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17
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Li X, Wang H. Multiple organs involved in the pathogenesis of non-alcoholic fatty liver disease. Cell Biosci 2020; 10:140. [PMID: 33372630 PMCID: PMC7720519 DOI: 10.1186/s13578-020-00507-y] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 11/27/2020] [Indexed: 02/08/2023] Open
Abstract
Non-alcoholic fatty liver disease (NAFLD) represents the leading cause of chronic liver disease worldwide and the anticipated health burden is huge. There are limited therapeutic approaches for NAFLD now. It’s imperative to get a better understanding of the disease pathogenesis if new treatments are to be discovered. As the hepatic manifestation of metabolic syndrome, this disease involves complex interactions between different organs and regulatory pathways. It’s increasingly clear that brain, gut and adipose tissue all contribute to NAFLD pathogenesis and development, in view of their roles in energy homeostasis. In the present review, we try to summarize currently available data regarding NAFLD pathogenesis and to lay a particular emphasis on the inter-organ crosstalk evidence.
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Affiliation(s)
- Xiaoyan Li
- Department of Oncology, the First Affiliated Hospital of Anhui Medical University, Hefei, 230022, China
| | - Hua Wang
- Department of Oncology, the First Affiliated Hospital of Anhui Medical University, Hefei, 230022, China. .,Inflammation and Immune Mediated Diseases Laboratory of Anhui Province, Hefei, 230032, China.
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18
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Hauck AK, Zhou T, Upadhyay A, Sun Y, O’Connor MB, Chen Y, Bernlohr DA. Histone Carbonylation Is a Redox-Regulated Epigenomic Mark That Accumulates with Obesity and Aging. Antioxidants (Basel) 2020; 9:antiox9121210. [PMID: 33271806 PMCID: PMC7761391 DOI: 10.3390/antiox9121210] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 11/23/2020] [Accepted: 11/27/2020] [Indexed: 02/07/2023] Open
Abstract
Oxidative stress is a hallmark of metabolic disease, though the mechanisms that define this link are not fully understood. Irreversible modification of proteins by reactive lipid aldehydes (protein carbonylation) is a major consequence of oxidative stress in adipose tissue and the substrates and specificity of this modification are largely unexplored. Here we show that histones are avidly modified by 4-hydroxynonenal (4-HNE) in vitro and in vivo. Carbonylation of histones by 4-HNE increased with age in male flies and visceral fat depots of mice and was potentiated in genetic (ob/ob) and high-fat feeding models of obesity. Proteomic evaluation of in vitro 4-HNE- modified histones led to the identification of both Michael and Schiff base adducts. In contrast, mapping of sites in vivo from obese mice exclusively revealed Michael adducts. In total, we identified 11 sites of 4-hydroxy hexenal (4-HHE) and 10 sites of 4-HNE histone modification in visceral adipose tissue. In summary, these results characterize adipose histone carbonylation as a redox-linked epigenomic mark associated with metabolic disease and aging.
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Affiliation(s)
- Amy K. Hauck
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA; (A.K.H.); (T.Z.); (Y.C.)
| | - Tong Zhou
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA; (A.K.H.); (T.Z.); (Y.C.)
| | - Ambuj Upadhyay
- Department of Molecular Biology, Cell Biology, Developmental Biology and Genetics, University of Minnesota, Minneapolis, MN 55455, USA; (A.U.); (M.B.O.)
| | - Yuxiang Sun
- Department of Nutrition, Texas A&M University, College Station, TX 77843, USA;
| | - Michael B. O’Connor
- Department of Molecular Biology, Cell Biology, Developmental Biology and Genetics, University of Minnesota, Minneapolis, MN 55455, USA; (A.U.); (M.B.O.)
| | - Yue Chen
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA; (A.K.H.); (T.Z.); (Y.C.)
| | - David A. Bernlohr
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA; (A.K.H.); (T.Z.); (Y.C.)
- Correspondence:
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19
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Politis-Barber V, Brunetta HS, Paglialunga S, Petrick HL, Holloway GP. Long-term, high-fat feeding exacerbates short-term increases in adipose mitochondrial reactive oxygen species, without impairing mitochondrial respiration. Am J Physiol Endocrinol Metab 2020; 319:E376-E387. [PMID: 32543945 PMCID: PMC7473917 DOI: 10.1152/ajpendo.00028.2020] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
White adipose tissue (WAT) dysfunction in obesity is implicated in the onset of whole body insulin resistance. Alterations in mitochondrial bioenergetics, namely impaired mitochondrial respiration and increased mitochondrial reactive oxygen species (mtROS) production, have been suggested to contribute to this metabolic dysregulation. However, techniques investigating mitochondrial function are classically normalized to tissue weight, which may be confounding when considering obesity-related adipocyte hypertrophy. Furthermore, the effect of long-term high-fat diet (HFD) on mtROS in WAT has yet to be elucidated. Therefore, we sought to determine the HFD-mediated temporal changes in mitochondrial respiration and mtROS emission in WAT. C57BL/6N mice received low-fat diet or HFD for 1 or 8 wk and changes in inguinal WAT (iWAT) and epididymal WAT (eWAT) were assessed. While tissue weight-normalized mitochondrial respiration was reduced in iWAT following 8-wk HFD-feeding, this effect was mitigated when adipocyte cell size and/or number were considered. These data suggest HFD does not impair mitochondrial respiratory capacity per adipocyte within WAT. In support of this assertion, within eWAT compensatory increases in lipid-supported and maximal succinate-supported respiration occurred at 8 wk despite cell hypertrophy and increases in WAT inflammation. Although these data suggest impairments in mitochondrial respiration do not contribute to HFD-mediated WAT phenotype, lipid-supported mtROS emission increased following 1-wk HFD in eWAT, while both lipid and carbohydrate-supported mtROS were increased at 8 wk in both depots. Combined, these data establish that while HFD does not impair adipocyte mitochondrial respiratory capacity, increased mtROS is an enduring physiological occurrence within WAT in HFD-induced obesity.
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Affiliation(s)
| | - Henver S. Brunetta
- 1Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
- 2Department of Physiological Sciences, Federal University of Santa Catarina, Florianopolis, Brazil
| | - Sabina Paglialunga
- 1Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Heather L. Petrick
- 1Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
| | - Graham P. Holloway
- 1Human Health and Nutritional Sciences, University of Guelph, Guelph, Ontario, Canada
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20
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Diehl KL, Muir TW. Chromatin as a key consumer in the metabolite economy. Nat Chem Biol 2020; 16:620-629. [PMID: 32444835 DOI: 10.1038/s41589-020-0517-x] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 03/05/2020] [Indexed: 12/31/2022]
Abstract
In eukaryotes, chromatin remodeling and post-translational modifications (PTMs) shape the local chromatin landscape to establish permissive and repressive regions within the genome, orchestrating transcription, replication, and DNA repair in concert with other epigenetic mechanisms. Though cellular nutrient signaling encompasses a huge number of pathways, recent attention has turned to the hypothesis that the metabolic state of the cell is communicated to the genome through the type and concentration of metabolites in the nucleus that are cofactors for chromatin-modifying enzymes. Importantly, both epigenetic and metabolic dysregulation are hallmarks of a range of diseases, and this metabolism-chromatin axis may yield a well of new therapeutic targets. In this Perspective, we highlight emerging themes in the inter-regulation of the genome and metabolism via chromatin, including nonenzymatic histone modifications arising from chemically reactive metabolites, the expansion of PTM diversity from cofactor-promiscuous chromatin-modifying enzymes, and evidence for the existence and importance of subnucleocytoplasmic metabolite pools.
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Affiliation(s)
- Katharine L Diehl
- Department of Chemistry, Princeton University, Princeton, NJ, USA. .,Department of Medicinal Chemistry, University of Utah, Salt Lake City, UT, USA.
| | - Tom W Muir
- Department of Chemistry, Princeton University, Princeton, NJ, USA.
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21
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Masschelin PM, Cox AR, Chernis N, Hartig SM. The Impact of Oxidative Stress on Adipose Tissue Energy Balance. Front Physiol 2020; 10:1638. [PMID: 32038305 PMCID: PMC6987041 DOI: 10.3389/fphys.2019.01638] [Citation(s) in RCA: 98] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Accepted: 12/30/2019] [Indexed: 12/21/2022] Open
Abstract
Overnutrition and sedentary activity reinforce the growing trend of worldwide obesity, insulin resistance, and type 2 diabetes. However, we have limited insight into how food intake generates sophisticated metabolic perturbations associated with obesity. Accumulation of mitochondrial oxidative stress contributes to the metabolic changes in obesity, but the mechanisms and significance are unclear. In white adipose tissue (WAT), mitochondrial oxidative stress, and the generation of reactive oxygen species (ROS) impact the endocrine and metabolic function of fat cells. The central role of mitochondria in nutrient handling suggests pharmacological targeting of pathological oxidative stress likely improves the metabolic profile of obesity. This review will summarize the critical pathogenic mechanisms of obesity-driven oxidative stress in WAT.
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Affiliation(s)
- Peter M Masschelin
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, Baylor College of Medicine, Houston, TX, United States.,Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, United States
| | - Aaron R Cox
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, Baylor College of Medicine, Houston, TX, United States
| | - Natasha Chernis
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, Baylor College of Medicine, Houston, TX, United States
| | - Sean M Hartig
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, Baylor College of Medicine, Houston, TX, United States.,Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, United States
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León J, Sáenz JM, Artacho-Cordón F, Fernández MF, Martin-Olmedo P, Salamanca-Fernández E, Gómez-Peña C, Olea N, Arrebola JP. Contribution of sociodemographic, occupational, lifestyle and dietary characteristics to the oxidative stress microenvironment in adipose tissue. ENVIRONMENTAL RESEARCH 2019; 175:52-62. [PMID: 31102949 DOI: 10.1016/j.envres.2019.04.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 04/12/2019] [Accepted: 04/30/2019] [Indexed: 05/20/2023]
Abstract
The present study was conceived on the basis of the few previous reports suggesting a potential relevance of the oxidative stress microenvironment in the adipose tissue, a biological matrix which is closely related to the development of several chronic pathologies. Thus, our aim was to describe the levels of enzymatic and non-enzymatic antioxidants and markers of oxidative damage in adipose tissue samples from a Spanish cohort, as well as their main sociodemographic, lifestyle, and dietary predictors. The study was conducted in a subsample (n = 271 adults) of GraMo cohort, recruited in Granada (Southern Spain). A face-to-face questionnaire was used to gather data regarding sociodemographic characteristics, lifestyle, dietary habits, health status, and perceived exposure to chemicals. We analyzed adipose tissue levels of lipid peroxidation (TBARS), total superoxide dismutase (SOD) activity, heme oxygenase-1 (HO-1) activity, and glutathione cycle biomarkers. Potential predictors of oxidative stress markers were assessed using stepwise multivariable linear regression analyses. SOD and TBARS levels were mainly related to sociodemographic and occupational characteristics, while the components of the glutathione cycle and HO-1 were predominantly associated with dietary habits. Men showed significantly lower levels of oxidative stress levels than women. In the regression models including only women, the use of oral contraceptive and hormonal therapy was associated with lower levels of oxidative stress, while the number of children was positively associated with increased oxidative biomarkers. Our results suggest that adipose tissue is potentially important matrix for the assessment of oxidative stress, which can be affected by specific environmental factors. These findings might be relevant for public health.
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Affiliation(s)
- Josefa León
- Instituto de Investigación Biosanitaria ibs.GRANADA, Spain; Unidad de Gestión Clínica de Aparato Digestivo, Hospital Universitario San Cecilio de Granada, Spain; CIBER en Enfermedades Hepáticas y Digestivas (CIBEREHD), Spain
| | - José M Sáenz
- Instituto de Investigación Biosanitaria ibs.GRANADA, Spain
| | - Francisco Artacho-Cordón
- Instituto de Investigación Biosanitaria ibs.GRANADA, Spain; University of Granada, Radiology and Physical Medicine Department, Spain; CIBER en Epidemiología y Salud Pública (CIBERESP), Spain.
| | - Mariana F Fernández
- Instituto de Investigación Biosanitaria ibs.GRANADA, Spain; University of Granada, Radiology and Physical Medicine Department, Spain; CIBER en Epidemiología y Salud Pública (CIBERESP), Spain
| | - Piedad Martin-Olmedo
- Instituto de Investigación Biosanitaria ibs.GRANADA, Spain; Escuela Andaluza de Salud Pública, Granada, Spain
| | - Elena Salamanca-Fernández
- Instituto de Investigación Biosanitaria ibs.GRANADA, Spain; Escuela Andaluza de Salud Pública, Granada, Spain
| | - Celia Gómez-Peña
- Instituto de Investigación Biosanitaria ibs.GRANADA, Spain; Unidad de Gestión Clínica de Farmacia Hospitalaria, Hospital Universitario San Cecilio, Granada, Spain
| | - Nicolás Olea
- Instituto de Investigación Biosanitaria ibs.GRANADA, Spain; University of Granada, Radiology and Physical Medicine Department, Spain; CIBER en Epidemiología y Salud Pública (CIBERESP), Spain; Unidad de Gestión Clínica de Medicina Nuclear, Hospital Universitario San Cecilio de Granada, Granada, Spain
| | - Juan P Arrebola
- Instituto de Investigación Biosanitaria ibs.GRANADA, Spain; CIBER en Epidemiología y Salud Pública (CIBERESP), Spain; University of Granada, Department of Preventive Medicine and Public Health, Spain.
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23
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Mercader J, Sabater AG, Le Gonidec S, Decaunes P, Chaplin A, Gómez-Zorita S, Milagro FI, Carpéné C. Oral Phenelzine Treatment Mitigates Metabolic Disturbances in Mice Fed a High-Fat Diet. J Pharmacol Exp Ther 2019; 371:555-566. [PMID: 31270215 DOI: 10.1124/jpet.119.259895] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Accepted: 07/01/2019] [Indexed: 12/15/2022] Open
Abstract
Novel mechanisms and health benefits have been recently suggested for the antidepressant drug phenelzine (PHE), known as a nonselective monoamine oxidase inhibitor. They include an antilipogenic action that could have an impact on excessive fat accumulation and obesity-related metabolic alterations. We evaluated the metabolic effects of an oral PHE treatment on mice fed a high-fat diet (HFD). Eleven-week-old male C57BL/6 mice were fed a HFD and either a 0.028% PHE solution (HFD + PHE) or water to drink for 11 weeks. PHE attenuated the increase in body weight and adiposity without affecting food consumption. Energy efficiency was lower in HFD + PHE mice. Lipid content was reduced in subcutaneous fat pads, liver, and skeletal muscle. In white adipose tissue (WAT), PHE reduced sterol regulatory element-binding protein-1c and phosphoenolpyruvate carboxykinase mRNA levels, inhibited amine-induced lipogenesis, and did not increase lipolysis. Moreover, HFD + PHE mice presented diminished levels of hydrogen peroxide release in subcutaneous WAT and reduced expression of leukocyte transmigration markers and proinflammatory cytokines in visceral WAT and liver. PHE reduced the circulating levels of glycerol, triacylglycerols, high-density lipoprotein cholesterol, and insulin. Insulin resistance was reduced, without affecting glucose levels and glucose tolerance. In contrast, PHE increased rectal temperature and slightly increased energy expenditure. The mitigation of HFD-induced metabolic disturbances points toward a promising role for PHE in obesity treatment and encourages further research on its mechanisms of action. SIGNIFICANCE STATEMENT: Phenelzine reduces body fat, markers of oxidative stress, inflammation, and insulin resistance in high-fat diet mice. Semicarbazide-sensitive amine oxidase, monoamine oxidase, phosphoenolpyruvate carboxykinase, and sterol regulatory element-binding protein-1c are involved in the metabolic effects of phenelzine. Phenelzine could be potentially used for the treatment of obesity-related complications.
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Affiliation(s)
- Josep Mercader
- Balearic Islands Health Research Institute, Palma de Mallorca, Spain (J.M.); Department of Fundamental Biology and Health Sciences, University of Balearic Islands (UIB), Palma de Mallorca, Spain (J.M.); Alimentómica, S.L., Spin-off from UIB, Palma de Mallorca, Spain (A.G.S.); Institute of Metabolic and Cardiovascular Diseases, INSERM, UMR1048, Teams 1 & 3, Toulouse, France (C.C., S.L.G., P.D.); I2MC, University of Toulouse, UMR1048, Paul Sabatier University, Toulouse Cedex 4, France (C.C., S.L.G., P.D.); Cardiovascular Research Institute, School of Medicine, Case Western Reserve University, Cleveland, Ohio (A.C.); Nutrition and Obesity Group, Department of Nutrition and Food Science, University of the Basque Country and Lucio Lascaray Research Institute, Vitoria, Spain (S.G.-Z.); CIBERobn Physiopathology of Obesity and Nutrition, Institute of Health Carlos III, Madrid, Spain (S.G.-Z., F.I.M.); Department of Nutrition, Food Science, and Physiology, University of Navarra, Pamplona, Spain (F.I.M.); and Centre for Nutrition Research, University of Navarra, Pamplona, Spain (F.I.M.)
| | - Agustín G Sabater
- Balearic Islands Health Research Institute, Palma de Mallorca, Spain (J.M.); Department of Fundamental Biology and Health Sciences, University of Balearic Islands (UIB), Palma de Mallorca, Spain (J.M.); Alimentómica, S.L., Spin-off from UIB, Palma de Mallorca, Spain (A.G.S.); Institute of Metabolic and Cardiovascular Diseases, INSERM, UMR1048, Teams 1 & 3, Toulouse, France (C.C., S.L.G., P.D.); I2MC, University of Toulouse, UMR1048, Paul Sabatier University, Toulouse Cedex 4, France (C.C., S.L.G., P.D.); Cardiovascular Research Institute, School of Medicine, Case Western Reserve University, Cleveland, Ohio (A.C.); Nutrition and Obesity Group, Department of Nutrition and Food Science, University of the Basque Country and Lucio Lascaray Research Institute, Vitoria, Spain (S.G.-Z.); CIBERobn Physiopathology of Obesity and Nutrition, Institute of Health Carlos III, Madrid, Spain (S.G.-Z., F.I.M.); Department of Nutrition, Food Science, and Physiology, University of Navarra, Pamplona, Spain (F.I.M.); and Centre for Nutrition Research, University of Navarra, Pamplona, Spain (F.I.M.)
| | - Sophie Le Gonidec
- Balearic Islands Health Research Institute, Palma de Mallorca, Spain (J.M.); Department of Fundamental Biology and Health Sciences, University of Balearic Islands (UIB), Palma de Mallorca, Spain (J.M.); Alimentómica, S.L., Spin-off from UIB, Palma de Mallorca, Spain (A.G.S.); Institute of Metabolic and Cardiovascular Diseases, INSERM, UMR1048, Teams 1 & 3, Toulouse, France (C.C., S.L.G., P.D.); I2MC, University of Toulouse, UMR1048, Paul Sabatier University, Toulouse Cedex 4, France (C.C., S.L.G., P.D.); Cardiovascular Research Institute, School of Medicine, Case Western Reserve University, Cleveland, Ohio (A.C.); Nutrition and Obesity Group, Department of Nutrition and Food Science, University of the Basque Country and Lucio Lascaray Research Institute, Vitoria, Spain (S.G.-Z.); CIBERobn Physiopathology of Obesity and Nutrition, Institute of Health Carlos III, Madrid, Spain (S.G.-Z., F.I.M.); Department of Nutrition, Food Science, and Physiology, University of Navarra, Pamplona, Spain (F.I.M.); and Centre for Nutrition Research, University of Navarra, Pamplona, Spain (F.I.M.)
| | - Pauline Decaunes
- Balearic Islands Health Research Institute, Palma de Mallorca, Spain (J.M.); Department of Fundamental Biology and Health Sciences, University of Balearic Islands (UIB), Palma de Mallorca, Spain (J.M.); Alimentómica, S.L., Spin-off from UIB, Palma de Mallorca, Spain (A.G.S.); Institute of Metabolic and Cardiovascular Diseases, INSERM, UMR1048, Teams 1 & 3, Toulouse, France (C.C., S.L.G., P.D.); I2MC, University of Toulouse, UMR1048, Paul Sabatier University, Toulouse Cedex 4, France (C.C., S.L.G., P.D.); Cardiovascular Research Institute, School of Medicine, Case Western Reserve University, Cleveland, Ohio (A.C.); Nutrition and Obesity Group, Department of Nutrition and Food Science, University of the Basque Country and Lucio Lascaray Research Institute, Vitoria, Spain (S.G.-Z.); CIBERobn Physiopathology of Obesity and Nutrition, Institute of Health Carlos III, Madrid, Spain (S.G.-Z., F.I.M.); Department of Nutrition, Food Science, and Physiology, University of Navarra, Pamplona, Spain (F.I.M.); and Centre for Nutrition Research, University of Navarra, Pamplona, Spain (F.I.M.)
| | - Alice Chaplin
- Balearic Islands Health Research Institute, Palma de Mallorca, Spain (J.M.); Department of Fundamental Biology and Health Sciences, University of Balearic Islands (UIB), Palma de Mallorca, Spain (J.M.); Alimentómica, S.L., Spin-off from UIB, Palma de Mallorca, Spain (A.G.S.); Institute of Metabolic and Cardiovascular Diseases, INSERM, UMR1048, Teams 1 & 3, Toulouse, France (C.C., S.L.G., P.D.); I2MC, University of Toulouse, UMR1048, Paul Sabatier University, Toulouse Cedex 4, France (C.C., S.L.G., P.D.); Cardiovascular Research Institute, School of Medicine, Case Western Reserve University, Cleveland, Ohio (A.C.); Nutrition and Obesity Group, Department of Nutrition and Food Science, University of the Basque Country and Lucio Lascaray Research Institute, Vitoria, Spain (S.G.-Z.); CIBERobn Physiopathology of Obesity and Nutrition, Institute of Health Carlos III, Madrid, Spain (S.G.-Z., F.I.M.); Department of Nutrition, Food Science, and Physiology, University of Navarra, Pamplona, Spain (F.I.M.); and Centre for Nutrition Research, University of Navarra, Pamplona, Spain (F.I.M.)
| | - Saioa Gómez-Zorita
- Balearic Islands Health Research Institute, Palma de Mallorca, Spain (J.M.); Department of Fundamental Biology and Health Sciences, University of Balearic Islands (UIB), Palma de Mallorca, Spain (J.M.); Alimentómica, S.L., Spin-off from UIB, Palma de Mallorca, Spain (A.G.S.); Institute of Metabolic and Cardiovascular Diseases, INSERM, UMR1048, Teams 1 & 3, Toulouse, France (C.C., S.L.G., P.D.); I2MC, University of Toulouse, UMR1048, Paul Sabatier University, Toulouse Cedex 4, France (C.C., S.L.G., P.D.); Cardiovascular Research Institute, School of Medicine, Case Western Reserve University, Cleveland, Ohio (A.C.); Nutrition and Obesity Group, Department of Nutrition and Food Science, University of the Basque Country and Lucio Lascaray Research Institute, Vitoria, Spain (S.G.-Z.); CIBERobn Physiopathology of Obesity and Nutrition, Institute of Health Carlos III, Madrid, Spain (S.G.-Z., F.I.M.); Department of Nutrition, Food Science, and Physiology, University of Navarra, Pamplona, Spain (F.I.M.); and Centre for Nutrition Research, University of Navarra, Pamplona, Spain (F.I.M.)
| | - Fermín I Milagro
- Balearic Islands Health Research Institute, Palma de Mallorca, Spain (J.M.); Department of Fundamental Biology and Health Sciences, University of Balearic Islands (UIB), Palma de Mallorca, Spain (J.M.); Alimentómica, S.L., Spin-off from UIB, Palma de Mallorca, Spain (A.G.S.); Institute of Metabolic and Cardiovascular Diseases, INSERM, UMR1048, Teams 1 & 3, Toulouse, France (C.C., S.L.G., P.D.); I2MC, University of Toulouse, UMR1048, Paul Sabatier University, Toulouse Cedex 4, France (C.C., S.L.G., P.D.); Cardiovascular Research Institute, School of Medicine, Case Western Reserve University, Cleveland, Ohio (A.C.); Nutrition and Obesity Group, Department of Nutrition and Food Science, University of the Basque Country and Lucio Lascaray Research Institute, Vitoria, Spain (S.G.-Z.); CIBERobn Physiopathology of Obesity and Nutrition, Institute of Health Carlos III, Madrid, Spain (S.G.-Z., F.I.M.); Department of Nutrition, Food Science, and Physiology, University of Navarra, Pamplona, Spain (F.I.M.); and Centre for Nutrition Research, University of Navarra, Pamplona, Spain (F.I.M.)
| | - Christian Carpéné
- Balearic Islands Health Research Institute, Palma de Mallorca, Spain (J.M.); Department of Fundamental Biology and Health Sciences, University of Balearic Islands (UIB), Palma de Mallorca, Spain (J.M.); Alimentómica, S.L., Spin-off from UIB, Palma de Mallorca, Spain (A.G.S.); Institute of Metabolic and Cardiovascular Diseases, INSERM, UMR1048, Teams 1 & 3, Toulouse, France (C.C., S.L.G., P.D.); I2MC, University of Toulouse, UMR1048, Paul Sabatier University, Toulouse Cedex 4, France (C.C., S.L.G., P.D.); Cardiovascular Research Institute, School of Medicine, Case Western Reserve University, Cleveland, Ohio (A.C.); Nutrition and Obesity Group, Department of Nutrition and Food Science, University of the Basque Country and Lucio Lascaray Research Institute, Vitoria, Spain (S.G.-Z.); CIBERobn Physiopathology of Obesity and Nutrition, Institute of Health Carlos III, Madrid, Spain (S.G.-Z., F.I.M.); Department of Nutrition, Food Science, and Physiology, University of Navarra, Pamplona, Spain (F.I.M.); and Centre for Nutrition Research, University of Navarra, Pamplona, Spain (F.I.M.)
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Kahraman C, Alver A, Bodur A, İnce Akça İ, Us Altay D, Canpolat S. Oxidant-Antioxidant Balance Changes in Adipose Tissues of High Fat Diet-Induced Obese Rats: Depot-Specific Manner and Ineffectiveness of N-Acetylcysteine. KOCAELI ÜNIVERSITESI SAĞLIK BILIMLERI DERGISI 2019. [DOI: 10.30934/kusbed.498189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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25
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Bodur A, İnce İ, Kahraman C, Abidin İ, Aydin-Abidin S, Alver A. Effect of a high sucrose and high fat diet in BDNF (+/-) mice on oxidative stress markers in adipose tissues. Arch Biochem Biophys 2019; 665:46-56. [PMID: 30797748 DOI: 10.1016/j.abb.2019.02.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Revised: 02/07/2019] [Accepted: 02/11/2019] [Indexed: 12/12/2022]
Abstract
The purpose of this study was to investigate the effects of a high fat and a high sucrosediet in wild type and BDNF (+/-) mice on oxidative stress in epididymal and subcutaneousadipose tissues by measuring different markers of oxidative stress and antioxidant enzymes. Wild type (WT) and BDNF (+/-) male mice were divided into six groups receiving fed control diet (CD), high sucrose diet (HSD), or high fat diet (HFD) for four months. Levels of 3-nitrotyrosine (3-NT) increased in the HFD-fed BDNF (+/-) mice, while 4-hydroxynonenal (4-HNE) levels increased in the CD and HFD-fed BDNF (+/-) groups. Malondialdehyde (MDA) levels decreased in subcutaneous tissue compared to epididymal adipose tissue, independently of diet type. Superoxide dismutase (SOD) activity was reduced by HFD (p < 0.05), butglutathione peroxidase (GSH-Px) activity was increased by HSD in epididymal adipose tissuein BDNF (+/-) mice (p < 0.05). GSH-Px activities was increased by CD and HFD in subcutaneous adipose tissue of BDNF (+/-) (p < 0.05). SOD2 and GSH-Px3 expressions were only decreased by HSD in epididymal and subcutaneous adipose tissues of BDNF (+/-) mice (p < 0.05). In conclusion, reduced BDNF may increase OS in epididymal adipose tissue, but not in subcutaneous adipose tissue following HSD and HFD.
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Affiliation(s)
- Akın Bodur
- Department of Medical Biochemistry, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - İmran İnce
- Department of Medical Biochemistry, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Cemil Kahraman
- Department of Nutrition and Dietetics, School of Health, Düzce University, Düzce, Turkey
| | - İsmail Abidin
- Department of Biophysics, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Selcen Aydin-Abidin
- Department of Biophysics, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
| | - Ahmet Alver
- Department of Medical Biochemistry, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey.
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Ngo DTM, Sverdlov AL, Karki S, Macartney-Coxson D, Stubbs RS, Farb MG, Carmine B, Hess DT, Colucci WS, Gokce N. Oxidative modifications of mitochondrial complex II are associated with insulin resistance of visceral fat in obesity. Am J Physiol Endocrinol Metab 2019; 316:E168-E177. [PMID: 30576243 PMCID: PMC6397365 DOI: 10.1152/ajpendo.00227.2018] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Obesity, particularly visceral adiposity, has been linked to mitochondrial dysfunction and increased oxidative stress, which have been suggested as mechanisms of insulin resistance. The mechanism(s) behind this remains incompletely understood. In this study, we hypothesized that mitochondrial complex II dysfunction plays a role in impaired insulin sensitivity in visceral adipose tissue of subjects with obesity. We obtained subcutaneous and visceral adipose tissue biopsies from 43 subjects with obesity (body mass index ≥ 30 kg/m2) during planned bariatric surgery. Compared with subcutaneous adipose tissue, visceral adipose tissue exhibited decreased complex II activity, which was restored with the reducing agent dithiothreitol (5 mM) ( P < 0.01). A biotin switch assay identified that cysteine oxidative posttranslational modifications (OPTM) in complex II subunit A (succinate dehydrogenase A) were increased in visceral vs. subcutaneous fat ( P < 0.05). Insulin treatment (100 nM) stimulated complex II activity in subcutaneous fat ( P < 0.05). In contrast, insulin treatment of visceral fat led to a decrease in complex II activity ( P < 0.01), which was restored with addition of the mitochondria-specific oxidant scavenger mito-TEMPO (10 µM). In a cohort of 10 subjects with severe obesity, surgical weight loss decreased OPTM and restored complex II activity, exclusively in the visceral depot. Mitochondrial complex II may be an unrecognized and novel mediator of insulin resistance associated with visceral adiposity. The activity of complex II is improved by weight loss, which may contribute to metabolic improvements associated with bariatric surgery.
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Affiliation(s)
- Doan T M Ngo
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine , Boston, Massachusetts
- School of Biomedical Sciences and Pharmacy, University of Newcastle , Newcastle, New South Wales , Australia
| | - Aaron L Sverdlov
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine , Boston, Massachusetts
- School of Medicine and Public Health, University of Newcastle , Newcastle, New South Wales , Australia
| | - Shakun Karki
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine , Boston, Massachusetts
| | - Donia Macartney-Coxson
- Biomarkers Group, Institute of Environmental Science and Research , Wellington , New Zealand
| | | | - Melissa G Farb
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine , Boston, Massachusetts
| | - Brian Carmine
- Department of General Surgery, Boston University School of Medicine , Boston, Massachusetts
| | - Donald T Hess
- Department of General Surgery, Boston University School of Medicine , Boston, Massachusetts
| | - Wilson S Colucci
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine , Boston, Massachusetts
| | - Noyan Gokce
- Evans Department of Medicine and Whitaker Cardiovascular Institute, Boston University School of Medicine , Boston, Massachusetts
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Salameh TS, Mortell WG, Logsdon AF, Butterfield DA, Banks WA. Disruption of the hippocampal and hypothalamic blood-brain barrier in a diet-induced obese model of type II diabetes: prevention and treatment by the mitochondrial carbonic anhydrase inhibitor, topiramate. Fluids Barriers CNS 2019; 16:1. [PMID: 30616618 PMCID: PMC6323732 DOI: 10.1186/s12987-018-0121-6] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2018] [Accepted: 12/18/2018] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Type II diabetes is a vascular risk factor for cognitive impairment and increased risk of dementia. Disruption of the blood-retinal barrier (BRB) and blood-brain barrier (BBB) are hallmarks of subsequent retinal edema and central nervous system dysfunction. However, the mechanisms by which diet or metabolic syndrome induces dysfunction are not understood. A proposed mechanism is an increase in reactive oxygen species (ROS) and oxidative stress. Inhibition of mitochondrial carbonic anhydrase (mCA) decreases ROS and oxidative stress. In this study, topiramate, a mCA inhibitor, was examined for its ability to protect the BRB and BBB in diet-induced obese type II diabetic mice. METHODS BBB and BRB permeability were assessed using 14C-sucrose and 99mTc-albumin in CD-1 mice fed a low-fat (control) or a high-fat diet. Topiramate administration was compared to saline controls in both preventative and efficacy arms examining BRB and BBB disruption. Body weight and blood glucose were measured weekly and body composition was assessed using EchoMRI. Metabolic activity was measured using a comprehensive laboratory animal monitoring system. Brain tissues collected from the mice were assessed for changes in oxidative stress and tight junction proteins. RESULTS High-fat feeding caused increased entry of 14C-sucrose and 99mTc-albumin into the brains of diet-induced obese type II diabetic mice. Increased permeability to 14C-sucrose was observed in the hypothalamus and hippocampus, and attenuated by topiramate treatment, while increased permeability to 99mTc-albumin occurred in the whole brain and was also attenuated by topiramate. Treatment with topiramate decreased measures of oxidative stress and increased expression of the tight junction proteins ZO-1 and claudin-12. In the retina, we observed increased entry of 99mTc-albumin simultaneously with increased entry into the whole brain during the preventative arm. This occurred prior to increased entry to the retina for 14C-sucrose which occurred during the efficacy arm. Treatment with topiramate had no effect on the retina. CONCLUSIONS Blood-brain barrier and blood-retinal barrier dysfunction were examined in a mouse model of diet-induced obese type II diabetes. These studies demonstrate that there are spatial and temporal differences in 14C-sucrose and 99mTc-albumin permeability in the brain and retina of diet-induced obese type II diabetic mice. Topiramate, a mitochondrial carbonic anhydrase inhibitor, is efficacious at both preventing and treating BBB disruption in this diet-induced obese type II diabetic mouse model.
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Affiliation(s)
- Therese S. Salameh
- Geriatrics Research, Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, 1660 S. Columbian Way, 810A/Bldg 1, Seattle, WA 98108 USA
- Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington, Seattle, WA USA
| | - William G. Mortell
- Geriatrics Research, Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, 1660 S. Columbian Way, 810A/Bldg 1, Seattle, WA 98108 USA
| | - Aric F. Logsdon
- Geriatrics Research, Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, 1660 S. Columbian Way, 810A/Bldg 1, Seattle, WA 98108 USA
- Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington, Seattle, WA USA
| | - D. Allan Butterfield
- Department of Chemistry and Sanders-Brown Center on Aging, University of Kentucky, Lexington, KY USA
| | - William A. Banks
- Geriatrics Research, Education and Clinical Center, Veterans Affairs Puget Sound Health Care System, 1660 S. Columbian Way, 810A/Bldg 1, Seattle, WA 98108 USA
- Division of Gerontology and Geriatric Medicine, Department of Medicine, University of Washington, Seattle, WA USA
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28
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Hauck AK, Huang Y, Hertzel AV, Bernlohr DA. Adipose oxidative stress and protein carbonylation. J Biol Chem 2018; 294:1083-1088. [PMID: 30563836 DOI: 10.1074/jbc.r118.003214] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Increased oxidative stress and abundance of reactive oxygen species (ROS) are positively correlated with a variety of pathophysiologies, including cardiovascular disease, type 2 diabetes, Alzheimer's disease, and neuroinflammation. In adipose biology, diabetic obesity is correlated with increased ROS in an age- and depot-specific manner and is mechanistically linked to mitochondrial dysfunction, endoplasmic reticulum (ER) stress, potentiated lipolysis, and insulin resistance. The cellular quality control systems that homeostatically regulate oxidative stress in the lean state are down-regulated in obesity as a consequence of inflammatory cytokine pressure leading to the accumulation of oxidized biomolecules. New findings have linked protein, DNA, and lipid oxidation at the biochemical level, and the structures and potential functions of protein adducts such as carbonylation that accumulate in stressed cells have been characterized. The sum total of such regulation and biochemical changes results in alteration of cellular metabolism and function in the obese state relative to the lean state and underlies metabolic disease progression. In this review, we discuss the molecular mechanisms and events underlying these processes and their implications for human health and disease.
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Affiliation(s)
- Amy K Hauck
- Institute for Diabetes, Obesity, and Metabolism, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | - Yimao Huang
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota-Twin Cities, Minneapolis, Minnesota 55455
| | - Ann V Hertzel
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota-Twin Cities, Minneapolis, Minnesota 55455
| | - David A Bernlohr
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota-Twin Cities, Minneapolis, Minnesota 55455.
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Kahraman C, Alver A, Şentürk A, Akça İİ. The relationship between carbonic anhydrase-III expression and oxidative stress in brown adipose tissue. DICLE MEDICAL JOURNAL 2018. [DOI: 10.5798/dicletip.497874] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hauck AK, Zhou T, Hahn W, Petegrosso R, Kuang R, Chen Y, Bernlohr DA. Obesity-induced protein carbonylation in murine adipose tissue regulates the DNA-binding domain of nuclear zinc finger proteins. J Biol Chem 2018; 293:13464-13476. [PMID: 30012885 DOI: 10.1074/jbc.ra118.003469] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 06/20/2018] [Indexed: 11/06/2022] Open
Abstract
In obesity-linked insulin resistance, oxidative stress in adipocytes leads to lipid peroxidation and subsequent carbonylation of proteins by diffusible lipid electrophiles. Reduction in oxidative stress attenuates protein carbonylation and insulin resistance, suggesting that lipid modification of proteins may play a role in metabolic disease, but the mechanisms remain incompletely understood. Herein, we show that in vivo, diet-induced obesity in mice surprisingly results in preferential carbonylation of nuclear proteins by 4-hydroxy-trans-2,3-nonenal (4-HNE) or 4-hydroxy-trans-2,3-hexenal (4-HHE). Proteomic and structural analyses revealed that residues in or around the sites of zinc coordination of zinc finger proteins, such as those containing the C2H2 or MATRIN, RING, C3H1, or N4-type DNA-binding domains, are particularly susceptible to carbonylation by lipid aldehydes. These observations strongly suggest that carbonylation functionally disrupts protein secondary structure supported by metal coordination. Analysis of one such target, the nuclear protein estrogen-related receptor γ (ERR-γ), showed that ERR-γ is modified by 4-HHE in the obese state. In vitro carbonylation decreased the DNA-binding capacity of ERR-γ and correlated with the obesity-linked down-regulation of many key genes promoting mitochondrial bioenergetics. Taken together, these findings reveal a novel mechanistic connection between oxidative stress and metabolic dysfunction arising from carbonylation of nuclear zinc finger proteins, such as the transcriptional regulator ERR-γ.
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Affiliation(s)
- Amy K Hauck
- From the Departments of Biochemistry, Molecular Biology, and Biophysics and
| | - Tong Zhou
- From the Departments of Biochemistry, Molecular Biology, and Biophysics and
| | - Wendy Hahn
- From the Departments of Biochemistry, Molecular Biology, and Biophysics and
| | - Raphael Petegrosso
- Computer Science and Engineering, University of Minnesota-Twin Cities, Minneapolis, Minnesota 55455
| | - Rui Kuang
- Computer Science and Engineering, University of Minnesota-Twin Cities, Minneapolis, Minnesota 55455
| | - Yue Chen
- From the Departments of Biochemistry, Molecular Biology, and Biophysics and
| | - David A Bernlohr
- From the Departments of Biochemistry, Molecular Biology, and Biophysics and
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Tatsuno F, Lee SH, Oe T. Imidazole dipeptides can quench toxic 4-oxo-2(E
)-nonenal: Molecular mechanism and mass spectrometric characterization of the reaction products. J Pept Sci 2018; 24:e3097. [DOI: 10.1002/psc.3097] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 05/21/2018] [Accepted: 06/03/2018] [Indexed: 11/12/2022]
Affiliation(s)
- Fumiya Tatsuno
- Department of Bio-analytical Chemistry, Graduate School of Pharmaceutical Sciences; Tohoku University; 6-3 Aramaki-aoba, Aoba-ku Sendai 980-8578 Japan
| | - Seon Hwa Lee
- Department of Bio-analytical Chemistry, Graduate School of Pharmaceutical Sciences; Tohoku University; 6-3 Aramaki-aoba, Aoba-ku Sendai 980-8578 Japan
| | - Tomoyuki Oe
- Department of Bio-analytical Chemistry, Graduate School of Pharmaceutical Sciences; Tohoku University; 6-3 Aramaki-aoba, Aoba-ku Sendai 980-8578 Japan
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Killion EA, Reeves AR, El Azzouny MA, Yan QW, Surujon D, Griffin JD, Bowman TA, Wang C, Matthan NR, Klett EL, Kong D, Newman JW, Han X, Lee MJ, Coleman RA, Greenberg AS. A role for long-chain acyl-CoA synthetase-4 (ACSL4) in diet-induced phospholipid remodeling and obesity-associated adipocyte dysfunction. Mol Metab 2018; 9:43-56. [PMID: 29398618 PMCID: PMC5870107 DOI: 10.1016/j.molmet.2018.01.012] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 01/07/2018] [Accepted: 01/16/2018] [Indexed: 12/31/2022] Open
Abstract
Objective Regulation of fatty acid (FA) metabolism is central to adipocyte dysfunction during diet-induced obesity (DIO). Long-chain acyl-CoA synthetase-4 (ACSL4) has been hypothesized to modulate the metabolic fates of polyunsaturated FA (PUFA), including arachidonic acid (AA), but the in vivo actions of ACSL4 are unknown. The purpose of our studies was to determine the in vivo role of adipocyte ACSL4 in regulating obesity-associated adipocyte dysfunction. Methods We developed a novel mouse model with adipocyte-specific ablation of ACSL4 (Ad-KO) using loxP Cre recombinase technology. Metabolic phenotyping of Ad-KO mice relative to their floxed littermates (ACSL4floxed) was performed, including body weight and body composition over time; insulin and glucose tolerance tests; and energy expenditure, activity, and food intake in metabolic cages. Adipocytes were isolated for ex vivo adipocyte oxygen consumption by Clark electrode and lipidomics analysis. In vitro adipocyte analysis including oxygen consumption by Seahorse and real-time PCR analysis were performed to confirm our in vivo findings. Results Ad-KO mice were protected against DIO, adipocyte death, and metabolic dysfunction. Adipocytes from Ad-KO mice fed high-fat diet (HFD) had reduced incorporation of AA into phospholipids (PL), free AA, and levels of the AA lipid peroxidation product 4-hydroxynonenal (4-HNE). Additionally, adipocytes from Ad-KO mice fed HFD had reduced p53 activation and increased adipocyte oxygen consumption (OCR), which we demonstrated are direct effects of 4-HNE on adipocytes in vitro. Conclusion These studies are the first to elucidate ACSL4's in vivo actions to regulate the incorporation of AA into PL and downstream effects on DIO-associated adipocyte dysfunction. By reducing the incorporation of AA into PL and free fatty acid pools in adipocytes, Ad-KO mice were significantly protected against HFD-induced increases in adipose and liver fat accumulation, adipocyte death, gonadal white adipose tissue (gWAT) inflammation, and insulin resistance (IR). Additionally, deficiency of adipocyte ACSL4 expression in mice fed a HFD resulted in increased gWAT adipocyte OCR and whole body energy expenditure (EE). ACSL4 expression is upregulated in murine white adipocytes during diet-induced obesity. Mice with adipocyte-specific ablation of ACSL4 (Ad-KO) are protected against diet-induced obesity, adipocyte death and metabolic dysfunction. Lipidomics profiling of isolated adipocytes from Ad-KO mice fed a high-fat diet (HFD) had reduced arachidonic acid (AA) in phospholipids. Adipocytes from Ad-KO mice fed HFD had reduced free AA and levels of the AA lipid peroxidation product 4-hydroxynonenal (4-HNE). Adipocytes from Ad-KO mice fed HFD had reduced p53 activation and increased adipocyte oxygen consumption (OCR). P53 activation and inhibited adipocyte OCR are direct effects of 4-HNE on adipocytes in vitro.
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Affiliation(s)
- Elizabeth A Killion
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, United States; Gerald J. and Dorothy R. Friedman School of Nutrition Science & Policy, Tufts University, Boston, MA 02111, United States
| | - Andrew R Reeves
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, United States
| | - Mahmoud A El Azzouny
- Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48105, United States
| | - Qing-Wu Yan
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, United States
| | - Defne Surujon
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, United States
| | - John D Griffin
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, United States; Gerald J. and Dorothy R. Friedman School of Nutrition Science & Policy, Tufts University, Boston, MA 02111, United States
| | - Thomas A Bowman
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, United States
| | - Chunyan Wang
- Center for Metabolic Origins of Disease, Sanford Burnham Presbyterian Medical Discovery Institute, Orlando, FL 32827, United States
| | - Nirupa R Matthan
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, United States; Gerald J. and Dorothy R. Friedman School of Nutrition Science & Policy, Tufts University, Boston, MA 02111, United States
| | - Eric L Klett
- Department of Medicine, University of North Carolina, Chapel Hill, NC 27599, United States
| | - Dong Kong
- Department of Neuroscience, Tufts Medical School, Programs of Neuroscience and of Cell, Molecular and Developmental Biology, Tufts University Sackler School of Graduate Biomedical Sciences, Boston, MA 02111, United States
| | - John W Newman
- Department of Nutrition, University of California, Obesity and Metabolism Research Unit, USDA, ARS, Western Human Nutrition Research Center, Davis, CA 95616, United States
| | - Xianlin Han
- Center for Metabolic Origins of Disease, Sanford Burnham Presbyterian Medical Discovery Institute, Orlando, FL 32827, United States
| | - Mi-Jeong Lee
- Division of Endocrinology, Diabetes, and Nutrition, Boston University School of Medicine, Boston, MA 02118, United States
| | - Rosalind A Coleman
- Department of Nutrition, University of North Carolina, Chapel Hill, NC 27599, United States
| | - Andrew S Greenberg
- Jean Mayer USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA 02111, United States; Gerald J. and Dorothy R. Friedman School of Nutrition Science & Policy, Tufts University, Boston, MA 02111, United States.
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Alcala M, Calderon-Dominguez M, Serra D, Herrero L, Ramos MP, Viana M. Short-term vitamin E treatment impairs reactive oxygen species signaling required for adipose tissue expansion, resulting in fatty liver and insulin resistance in obese mice. PLoS One 2017; 12:e0186579. [PMID: 29028831 PMCID: PMC5640231 DOI: 10.1371/journal.pone.0186579] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2017] [Accepted: 10/03/2017] [Indexed: 12/14/2022] Open
Abstract
Objectives The use of antioxidant therapy in the treatment of oxidative stress-related diseases such as cardiovascular disease, diabetes or obesity remains controversial. Our aim is to demonstrate that antioxidant supplementation may promote negative effects if used before the establishment of oxidative stress due to a reduced ROS generation under physiological levels, in a mice model of obesity. Methods C57BL/6J mice were fed with a high-fat diet for 14 weeks, with (OE group) or without (O group) vitamin E supplementation. Results O mice developed a mild degree of obesity, which was not enough to induce metabolic alterations or oxidative stress. These animals exhibited a healthy expansion of retroperitoneal white adipose tissue (rpWAT) and the liver showed no signs of lipotoxicity. Interestingly, despite achieving a similar body weight, OE mice were insulin resistant. In the rpWAT they presented a reduced generation of ROS, even below physiological levels (C: 1651.0 ± 212.0; O: 3113 ± 284.7; OE: 917.6 ±104.4 RFU/mg protein. C vs OE p< 0.01). ROS decay may impair their action as second messengers, which could account for the reduced adipocyte differentiation, lipid transport and adipogenesis compared to the O group. Together, these processes limited the expansion of this fat pad and as a consequence, lipid flux shifted towards the liver, causing steatosis and hepatomegaly, which may contribute to the marked insulin resistance. Conclusions This study provides in vivo evidence for the role of ROS as second messengers in adipogenesis, lipid metabolism and insulin signaling. Reducing ROS generation below physiological levels when the oxidative process has not yet been established may be the cause of the controversial results obtained by antioxidant therapy.
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Affiliation(s)
- Martin Alcala
- Department of Chemistry and Biochemistry, Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Madrid, Spain
| | - Maria Calderon-Dominguez
- Department of Chemistry and Biochemistry, Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Madrid, Spain
| | - Dolors Serra
- Department of Biochemistry and Physiology, Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Barcelona, Spain
- CIBER Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Instituto de Salud Carlos III, Madrid, Spain
| | - Laura Herrero
- Department of Biochemistry and Physiology, Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona, Barcelona, Spain
- CIBER Fisiopatología de la Obesidad y la Nutrición (CIBEROBN), Instituto de Salud Carlos III, Madrid, Spain
| | - Maria P. Ramos
- Department of Chemistry and Biochemistry, Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Madrid, Spain
| | - Marta Viana
- Department of Chemistry and Biochemistry, Facultad de Farmacia, Universidad San Pablo-CEU, CEU Universities, Madrid, Spain
- * E-mail:
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Olson DH, Burrill JS, Kuzmicic J, Hahn WS, Park JM, Kim DH, Bernlohr DA. Down regulation of Peroxiredoxin-3 in 3T3-L1 adipocytes leads to oxidation of Rictor in the mammalian-target of rapamycin complex 2 (mTORC2). Biochem Biophys Res Commun 2017; 493:1311-1317. [PMID: 28986255 DOI: 10.1016/j.bbrc.2017.09.171] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Accepted: 09/30/2017] [Indexed: 10/18/2022]
Abstract
Mitochondrially-derived oxidative stress has been implicated in the development of obesity-induced insulin resistance and is correlated with down regulation of Peroxiredoxin-3 (Prdx3). Prdx3 knockout mice exhibit whole-body insulin resistance, while Prdx3 transgenic animals remain insulin sensitive when placed on a high fat diet. To define the molecular events linking mitochondrial oxidative stress to insulin action, Prdx3 was silenced in 3T3-L1 adipocytes (Prdx3 KD) and the resultant cells evaluated for mitochondrial function, endoplasmic reticulum stress (ER stress), mitochondrial unfolded protein response (mtUPR) and insulin signaling. Prdx3 KD cells exhibit a two-fold increase in H2O2, reduced insulin-stimulated glucose transport and attenuated S473 phosphorylation of the mTORC2 substrate, Akt. Importantly, the decrease in glucose uptake can be rescued by pre-treatment with the antioxidant N-acetyl-cysteine (NAC). The changes in insulin sensitivity occur independently from activation of the ER stress or mtUPR pathways. Analysis of mTORC2, the complex responsible for phosphorylating Akt at S473, reveals increased cysteine oxidation of Rictor in Prdx3 KD cells that can be rescued with NAC. Taken together, these data suggest mitochondrial dysfunction in adipocytes may attenuate insulin signaling via oxidation of the mammalian-target of rapamycin complex 2 (mTORC2).
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Affiliation(s)
- Dalay H Olson
- Department of Integrative Biology and Physiology, University of Minnesota, Minneapolis, MN 55455, USA
| | - Joel S Burrill
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Jovan Kuzmicic
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Wendy S Hahn
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Ji-Man Park
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - Do-Hyung Kim
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA
| | - David A Bernlohr
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, Minneapolis, MN 55455, USA.
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Shi W, Hegeman MA, van Dartel DA, Tang J, Suarez M, Swarts H, van der Hee B, Arola L, Keijer J. Effects of a wide range of dietary nicotinamide riboside (NR) concentrations on metabolic flexibility and white adipose tissue (WAT) of mice fed a mildly obesogenic diet. Mol Nutr Food Res 2017; 61:1600878. [PMID: 28211258 PMCID: PMC5573990 DOI: 10.1002/mnfr.201600878] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Revised: 12/29/2016] [Accepted: 01/23/2017] [Indexed: 02/02/2023]
Abstract
SCOPE Metabolic flexibility is the ability to switch metabolism between carbohydrate oxidation (CHO) and fatty acid oxidation (FAO) and is a biomarker for metabolic health. The effect on metabolic health of nicotinamide riboside (NR) as an exclusive source of vitamin B3 is unknown and is examined here for a wide range of NR. DESIGN AND METHODS Nine-week-old male C57BL/6JRcc mice received a semi-purified mildly obesogenic (40 en% fat) diet containing 0.14% L-tryptophan and either 5, 15, 30, 180, or 900 mg NR per kg diet for 15 weeks. Body composition and metabolic parameters were analyzed. Metabolic flexibility was measured using indirect calorimetry. Gene expression in epididymal white adipose tissue (eWAT) was measured using qRT-PCR . RESULTS The maximum delta respiratory exchange ratio when switching from CHO to FAO (maxΔRERCHO1→FAO ) and when switching from FAO to CHO (maxΔRERFAO→CHO2 ) were largest in 30 mg NR per kg diet (30NR). In eWAT, the gene expression of Pparγ, a master regulator of adipogenesis, and of Sod2 and Prdx3, two antioxidant genes, were significantly upregulated in 30NR compared to 5NR. CONCLUSION 30NR is most beneficial for metabolic health, in terms of metabolic flexibility and eWAT gene expression, of mice on an obesogenic diet.
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Affiliation(s)
- Wenbiao Shi
- Human and Animal PhysiologyWageningen UniversityWageningenThe Netherlands
| | - Maria A. Hegeman
- Human and Animal PhysiologyWageningen UniversityWageningenThe Netherlands
| | | | - Jing Tang
- Human and Animal PhysiologyWageningen UniversityWageningenThe Netherlands
- Institute of Animal SciencesChinese Academy of Agricultural Sciences (CAAS)BeijingChina
| | - Manuel Suarez
- Department of Biochemistry and BiotechnologyUniversity Rovira VirgiliTarragonaSpain
| | - Hans Swarts
- Human and Animal PhysiologyWageningen UniversityWageningenThe Netherlands
| | - Bart van der Hee
- Human and Animal PhysiologyWageningen UniversityWageningenThe Netherlands
| | - Lluis Arola
- Department of Biochemistry and BiotechnologyUniversity Rovira VirgiliTarragonaSpain
- Nutrition and Health Research GroupTechnological Center of Nutrition and Health (CTNS)ReusSpain
| | - Jaap Keijer
- Human and Animal PhysiologyWageningen UniversityWageningenThe Netherlands
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Han YH, Buffolo M, Pires KM, Pei S, Scherer PE, Boudina S. Adipocyte-Specific Deletion of Manganese Superoxide Dismutase Protects From Diet-Induced Obesity Through Increased Mitochondrial Uncoupling and Biogenesis. Diabetes 2016; 65:2639-51. [PMID: 27284109 PMCID: PMC5001177 DOI: 10.2337/db16-0283] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 05/25/2016] [Indexed: 01/30/2023]
Abstract
Obesity and insulin resistance are associated with oxidative stress (OS). The causal role of adipose OS in the pathogenesis of these conditions is unknown. To address this issue, we generated mice with an adipocyte-selective deletion of manganese superoxide dismutase (MnSOD). When fed a high-fat diet (HFD), the AdSod2 knockout (KO) mice exhibited less adiposity, reduced adipocyte hypertrophy, and decreased circulating leptin. The resistance to diet-induced adiposity was the result of an increased metabolic rate and energy expenditure. Furthermore, palmitate oxidation was elevated in the white adipose tissue (WAT) and brown adipose tissue of AdSod2 KO mice fed an HFD, and the expression of key fatty acid oxidation genes was increased. To gain mechanistic insight into the increased fat oxidation in HFD-fed AdSod2 KO mice, we quantified the mitochondrial function and mitochondrial content in WAT and found that MnSOD deletion increased mitochondrial oxygen consumption and induced mitochondrial biogenesis. This effect was preserved in cultured adipocytes from AdSod2 KO mice in vitro. As expected from the enhanced fat oxidation, circulating levels of free fatty acids were reduced in the HFD-fed AdSod2 KO mice. Finally, HFD-fed AdSod2 KO mice were protected from hepatic steatosis, adipose tissue inflammation, and glucose and insulin intolerance. Taken together, these results demonstrate that MnSOD deletion in adipocytes triggered an adaptive stress response that activated mitochondrial biogenesis and enhanced mitochondrial fatty acid oxidation, thereby preventing diet-induced obesity and insulin resistance.
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Affiliation(s)
- Yong Hwan Han
- Department of Nutrition and Integrative Physiology; Division of Endocrinology, Metabolism and Diabetes; and Program in Molecular Medicine, University of Utah School of Medicine, Salt Lake City, UT
| | - Márcio Buffolo
- Department of Nutrition and Integrative Physiology; Division of Endocrinology, Metabolism and Diabetes; and Program in Molecular Medicine, University of Utah School of Medicine, Salt Lake City, UT
| | - Karla Maria Pires
- Department of Nutrition and Integrative Physiology; Division of Endocrinology, Metabolism and Diabetes; and Program in Molecular Medicine, University of Utah School of Medicine, Salt Lake City, UT
| | - Shaobo Pei
- Department of Nutrition and Integrative Physiology; Division of Endocrinology, Metabolism and Diabetes; and Program in Molecular Medicine, University of Utah School of Medicine, Salt Lake City, UT
| | - Philipp E Scherer
- Touchstone Diabetes Center, Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX Department of Cell Biology, University of Texas Southwestern Medical Center, Dallas, TX
| | - Sihem Boudina
- Department of Nutrition and Integrative Physiology; Division of Endocrinology, Metabolism and Diabetes; and Program in Molecular Medicine, University of Utah School of Medicine, Salt Lake City, UT
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Abstract
The α,β polyunsaturated lipid aldehydes are potent lipid electrophiles that covalently modify lipids, proteins, and nucleic acids. Recent work highlights the critical role these lipids play under both physiological and pathological conditions. Protein carbonylation resulting from nucleophilic attack of lysine, histidine, and cysteine residues is a major outcome of oxidative stress and functions as a redox-sensitive signaling mechanism with roles in autophagy, cell proliferation, transcriptional control, and apoptosis. In addition, protein carbonylation is implicated as an initiating factor in mitochondrial dysfunction and endoplasmic reticulum stress, providing a mechanistic connection between oxidative stress and metabolic disease. In this review, we discuss the generation and metabolism of reactive lipid aldehydes, as well as their signaling roles.
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Affiliation(s)
- Amy K Hauck
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota-Twin Cities, Minneapolis, MN 55455
| | - David A Bernlohr
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota-Twin Cities, Minneapolis, MN 55455
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Glutathionyl systems and metabolic dysfunction in obesity. Nutr Rev 2015; 73:858-68. [DOI: 10.1093/nutrit/nuv042] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Accepted: 04/18/2015] [Indexed: 12/18/2022] Open
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Mazzarella L. Why does obesity promote cancer? Epidemiology, biology, and open questions. Ecancermedicalscience 2015; 9:554. [PMID: 26284118 PMCID: PMC4531127 DOI: 10.3332/ecancer.2015.554] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Indexed: 12/14/2022] Open
Abstract
The association between obesity and/or metabolic syndrome and an elevated mortality from cancer has been confirmed by an astonishing number of studies across nations and ethnicities, such that obesity is now recognised to be among the most prominent cancer risk factors worldwide. Despite this overwhelming evidence and the societal impact of obesity, we know surprisingly little about the underlying molecular mechanisms. This knowledge gap is a major obstacle to the implementation of effective lifestyle change policies. As the scientific community is insecure on what messages it should deliver, administrators are uncertain as to what exactly to recommend, and consumers are confused about whom to believe. This leaves the field flooded with pseudo-scientific recommendations that are hard to eradicate. In this review, I will provide a summary of the existing epidemiological and mechanistic evidence on the relationship between systemic metabolism and cancer, highlighting debated issues and ongoing investigations.
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Affiliation(s)
- Luca Mazzarella
- European Institute of Oncology, Via Ripamonti 435, Milan 20141, Italy
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40
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ALDH2*2 Allele is a Negative Risk Factor for Cerebral Infarction in Chinese Women. Biochem Genet 2015; 53:260-7. [DOI: 10.1007/s10528-015-9686-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2015] [Accepted: 06/24/2015] [Indexed: 10/23/2022]
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Paglialunga S, Ludzki A, Root-McCaig J, Holloway GP. In adipose tissue, increased mitochondrial emission of reactive oxygen species is important for short-term high-fat diet-induced insulin resistance in mice. Diabetologia 2015; 58:1071-80. [PMID: 25754553 DOI: 10.1007/s00125-015-3531-x] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2014] [Accepted: 01/28/2015] [Indexed: 12/20/2022]
Abstract
AIMS/HYPOTHESIS Consuming a high-fat diet (HFD) induces insulin resistance in white adipose tissue (WAT) within 1 week. However, little is known about the initiating events. One potential mechanism that has remained largely unexplored is excessive mitochondrial emission of reactive oxygen species (ROS). METHODS To determine the role of mitochondrial ROS emissions at the onset of insulin resistance, wild-type (WT) mice were placed on an HFD for 1 week. WAT insulin sensitivity and inflammation were assessed by western blot. In addition, we optimised/validated a method to determine ROS emissions in permeabilised WAT. RESULTS An HFD for 1 week resulted in impaired insulin signalling, increased c-Jun NH2-terminal kinase (JNK) phosphorylation and an increase in oxidative stress. These changes were associated with an increase in fatty-acid-mediated mitochondrial ROS emissions without any change in mitochondrial respiration/content. To determine that mitochondrial ROS causes insulin resistance, we used transgenic mice that express human catalase in mitochondria (MCAT) as a model of upregulated mitochondrial antioxidant enzyme capacity. MCAT mice displayed attenuated mitochondrial ROS emission, preserved insulin signalling and no inflammatory response following an HFD. CONCLUSIONS/INTERPRETATION Findings from this study suggest that elevated mitochondrial ROS emission contributes to HFD-induced WAT insulin resistance.
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Affiliation(s)
- Sabina Paglialunga
- Department of Human Health and Nutritional Sciences, University of Guelph, 50 Stone Rd, Guelph, ON, N1G 2W1, Canada
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Aluise CD, Camarillo JM, Shimozu Y, Galligan JJ, Rose KL, Tallman KA, Marnett LJ. Site-specific, intramolecular cross-linking of Pin1 active site residues by the lipid electrophile 4-oxo-2-nonenal. Chem Res Toxicol 2015; 28:817-27. [PMID: 25739016 PMCID: PMC4480626 DOI: 10.1021/acs.chemrestox.5b00038] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
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Products of oxidative damage to lipids
include 4-hydroxy-2-nonenal
(HNE) and 4-oxo-2-nonenal (ONE), both of which are cytotoxic electrophiles.
ONE reacts more rapidly with nucleophilic amino acid side chains,
resulting in covalent protein adducts, including residue–residue
cross-links. Previously, we demonstrated that peptidylprolyl cis/trans isomerase A1 (Pin1) was highly
susceptible to adduction by HNE and that the catalytic cysteine (Cys113)
was the preferential site of modification. Here, we show that ONE
also preferentially adducts Pin1 at the catalytic Cys but results
in a profoundly different modification. Results from experiments using
purified Pin1 incubated with ONE revealed the principal product to
be a Cys-Lys pyrrole-containing cross-link between the side chains
of Cys113 and Lys117. In vitro competition assays
between HNE and ONE demonstrate that ONE reacts more rapidly than
HNE with Cys113. Exposure of RKO cells to alkynyl-ONE (aONE) followed
by copper-mediated click chemistry and streptavidin purification revealed
that Pin1 is also modified by ONE in cells. Analysis of the Pin1 crystal
structure reveals that Cys113 and Lys117 are oriented toward each
other in the active site, facilitating formation of an ONE cross-link.
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Affiliation(s)
- Christopher D Aluise
- †A.B. Hancock Jr. Memorial Laboratory for Cancer Research, Departments of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute of Chemical Biology, Center in Molecular Toxicology, Vanderbilt-Ingram Cancer Center, ‡Department of Chemistry, and §Mass Spectrometry Research Core, Vanderbilt University, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, United States
| | - Jeannie M Camarillo
- †A.B. Hancock Jr. Memorial Laboratory for Cancer Research, Departments of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute of Chemical Biology, Center in Molecular Toxicology, Vanderbilt-Ingram Cancer Center, ‡Department of Chemistry, and §Mass Spectrometry Research Core, Vanderbilt University, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, United States
| | - Yuki Shimozu
- †A.B. Hancock Jr. Memorial Laboratory for Cancer Research, Departments of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute of Chemical Biology, Center in Molecular Toxicology, Vanderbilt-Ingram Cancer Center, ‡Department of Chemistry, and §Mass Spectrometry Research Core, Vanderbilt University, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, United States
| | - James J Galligan
- †A.B. Hancock Jr. Memorial Laboratory for Cancer Research, Departments of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute of Chemical Biology, Center in Molecular Toxicology, Vanderbilt-Ingram Cancer Center, ‡Department of Chemistry, and §Mass Spectrometry Research Core, Vanderbilt University, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, United States
| | - Kristie L Rose
- †A.B. Hancock Jr. Memorial Laboratory for Cancer Research, Departments of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute of Chemical Biology, Center in Molecular Toxicology, Vanderbilt-Ingram Cancer Center, ‡Department of Chemistry, and §Mass Spectrometry Research Core, Vanderbilt University, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, United States
| | - Keri A Tallman
- †A.B. Hancock Jr. Memorial Laboratory for Cancer Research, Departments of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute of Chemical Biology, Center in Molecular Toxicology, Vanderbilt-Ingram Cancer Center, ‡Department of Chemistry, and §Mass Spectrometry Research Core, Vanderbilt University, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, United States
| | - Lawrence J Marnett
- †A.B. Hancock Jr. Memorial Laboratory for Cancer Research, Departments of Biochemistry, Chemistry and Pharmacology, Vanderbilt Institute of Chemical Biology, Center in Molecular Toxicology, Vanderbilt-Ingram Cancer Center, ‡Department of Chemistry, and §Mass Spectrometry Research Core, Vanderbilt University, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146, United States
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43
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Burrill JS, Long EK, Reilly B, Deng Y, Armitage IM, Scherer PE, Bernlohr DA. Inflammation and ER stress regulate branched-chain amino acid uptake and metabolism in adipocytes. Mol Endocrinol 2015; 29:411-20. [PMID: 25635940 DOI: 10.1210/me.2014-1275] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Inflammation plays a critical role in the pathology of obesity-linked insulin resistance and is mechanistically linked to the effects of macrophage-derived cytokines on adipocyte energy metabolism, particularly that of the mitochondrial branched-chain amino acid (BCAA) and tricarboxylic acid (TCA) pathways. To address the role of inflammation on energy metabolism in adipocytes, we used high fat-fed C57BL/6J mice and lean controls and measured the down-regulation of genes linked to BCAA and TCA cycle metabolism selectively in visceral but not in subcutaneous adipose tissue, brown fat, liver, or muscle. Using 3T3-L1 cells, TNFα, and other proinflammatory cytokine treatments reduced the expression of the genes linked to BCAA transport and oxidation. Consistent with this, [(14)C]-leucine uptake and conversion to triglycerides was markedly attenuated in TNFα-treated adipocytes, whereas the conversion to protein was relatively unaffected. Because inflammatory cytokines lead to the induction of endoplasmic reticulum stress, we evaluated the effects of tunicamycin or thapsigargin treatment of 3T3-L1 cells and measured a similar down-regulation in the BCAA/TCA cycle pathway. Moreover, transgenic mice overexpressing X-box binding protein 1 in adipocytes similarly down-regulated genes of BCAA and TCA metabolism in vivo. These results indicate that inflammation and endoplasmic reticulum stress attenuate lipogenesis in visceral adipose depots by down-regulating the BCAA/TCA metabolism pathway and are consistent with a model whereby the accumulation of serum BCAA in the obese insulin-resistant state is linked to adipose inflammation.
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Affiliation(s)
- Joel S Burrill
- Department of Biochemistry, Molecular Biology, and Biophysics (J.S.B., E.K.L., B.R., I.M.A., D.A.B.), University of Minnesota-Twin Cities, Minneapolis, Minnesota 55455; and Touchstone Diabetes Center (Y.D., P.E.S.) and Department of Internal Medicine (Y.D., P.E.S.), University of Texas Southwestern Medical Center, Dallas, Texas 75390
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Abstract
Branched-chain amino acids (BCAAs) are important nutrient signals that have direct and indirect effects. Frequently, BCAAs have been reported to mediate antiobesity effects, especially in rodent models. However, circulating levels of BCAAs tend to be increased in individuals with obesity and are associated with worse metabolic health and future insulin resistance or type 2 diabetes mellitus (T2DM). A hypothesized mechanism linking increased levels of BCAAs and T2DM involves leucine-mediated activation of the mammalian target of rapamycin complex 1 (mTORC1), which results in uncoupling of insulin signalling at an early stage. A BCAA dysmetabolism model proposes that the accumulation of mitotoxic metabolites (and not BCAAs per se) promotes β-cell mitochondrial dysfunction, stress signalling and apoptosis associated with T2DM. Alternatively, insulin resistance might promote aminoacidaemia by increasing the protein degradation that insulin normally suppresses, and/or by eliciting an impairment of efficient BCAA oxidative metabolism in some tissues. Whether and how impaired BCAA metabolism might occur in obesity is discussed in this Review. Research on the role of individual and model-dependent differences in BCAA metabolism is needed, as several genes (BCKDHA, PPM1K, IVD and KLF15) have been designated as candidate genes for obesity and/or T2DM in humans, and distinct phenotypes of tissue-specific branched chain ketoacid dehydrogenase complex activity have been detected in animal models of obesity and T2DM.
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Affiliation(s)
- Christopher J Lynch
- Cellular and Molecular Physiology Department, The Pennsylvania State University, 500 University Drive, MC-H166, Hershey, PA 17033, USA
| | - Sean H Adams
- Arkansas Children's Nutrition Center, and Department of Pediatrics, University of Arkansas for Medical Sciences, 15 Children's Way, Little Rock, AR 72202, USA
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45
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Fan F, Cao Q, Wang C, Ma X, Shen C, Liu XW, Bu LP, Zou YZ, Hu K, Sun AJ, Ge JB. Impact of chronic low to moderate alcohol consumption on blood lipid and heart energy profile in acetaldehyde dehydrogenase 2-deficient mice. Acta Pharmacol Sin 2014; 35:1015-22. [PMID: 24998256 DOI: 10.1038/aps.2014.46] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2014] [Accepted: 05/04/2014] [Indexed: 12/23/2022] Open
Abstract
AIM To investigate the roles of acetaldehyde dehydrogenase 2 (ALDH2), the key enzyme of ethanol metabolism, in chronic low to moderate alcohol consumption-induced heart protective effects in mice. METHODS Twenty-one male wild-type (WT) or ALDH2-knockout (KO) mice were used in this study. In each genotype, 14 animals received alcohol (2.5%, 5% and 10% in week 1-3, respectively, and 18% in week 4-7), and 7 received water for 7 weeks. After the treatments, survival rate and general characteristics of the animals were evaluated. Serum ethanol and acetaldehyde levels and blood lipids were measured. Metabolomics was used to characterize the heart and serum metabolism profiles. RESULTS Chronic alcohol intake decreased the survival rate of KO mice by 50%, and significantly decreased their body weight, but did not affect those of WT mice. Chronic alcohol intake significantly increased the serum ethanol levels in both WT and KO mice, but KO mice had significantly higher serum acetaldehyde levels than WT mice. Chronic alcohol intake significantly increased the serum HDL cholesterol levels in WT mice, and did not change the serum HDL cholesterol levels in KO mice. After chronic alcohol intake, WT and KO mice showed differential heart and serum metabolism profiles, including the 3 main energy substrate types (lipids, glucose and amino acids) and three carboxylic acid cycles. CONCLUSION Low to moderate alcohol consumption increases HDL cholesterol levels and improves heart energy metabolism profile in WT mice but not in ALDH2-KO mice. Thus, preserved ALDH2 function is essential for the protective effect of low to moderate alcohol on the cardiovascular system.
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46
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Cummins TD, Holden CR, Sansbury BE, Gibb AA, Shah J, Zafar N, Tang Y, Hellmann J, Rai SN, Spite M, Bhatnagar A, Hill BG. Metabolic remodeling of white adipose tissue in obesity. Am J Physiol Endocrinol Metab 2014; 307:E262-77. [PMID: 24918202 PMCID: PMC4121575 DOI: 10.1152/ajpendo.00271.2013] [Citation(s) in RCA: 116] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Adipose tissue metabolism is a critical regulator of adiposity and whole body energy expenditure; however, metabolic changes that occur in white adipose tissue (WAT) with obesity remain unclear. The purpose of this study was to understand the metabolic and bioenergetic changes occurring in WAT with obesity. Wild-type (C57BL/6J) mice fed a high-fat diet (HFD) showed significant increases in whole body adiposity, had significantly lower V̇(O₂), V̇(CO₂), and respiratory exchange ratios, and demonstrated worsened glucose and insulin tolerance compared with low-fat-fed mice. Metabolomic analysis of WAT showed marked changes in lipid, amino acid, carbohydrate, nucleotide, and energy metabolism. Tissue levels of succinate and malate were elevated, and metabolites that could enter the Krebs cycle via anaplerosis were mostly diminished in high-fat-fed mice, suggesting altered mitochondrial metabolism. Despite no change in basal oxygen consumption or mitochondrial DNA abundance, citrate synthase activity was decreased by more than 50%, and responses to FCCP were increased in WAT from mice fed a high-fat diet. Moreover, Pgc1a was downregulated and Cox7a1 upregulated after 6 wk of HFD. After 12 wk of high-fat diet, the abundance of several proteins in the mitochondrial respiratory chain or matrix was diminished. These changes were accompanied by increased Parkin and Pink1, decreased p62 and LC3-I, and ultrastructural changes suggestive of autophagy and mitochondrial remodeling. These studies demonstrate coordinated restructuring of metabolism and autophagy that could contribute to the hypertrophy and whitening of adipose tissue in obesity.
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Affiliation(s)
- Timothy D Cummins
- Institute of Molecular Cardiology, Department of Medicine; Diabetes and Obesity Center
| | - Candice R Holden
- Institute of Molecular Cardiology, Department of Medicine; Diabetes and Obesity Center; Department of Physiology and Biophysics; and
| | - Brian E Sansbury
- Institute of Molecular Cardiology, Department of Medicine; Diabetes and Obesity Center; Department of Physiology and Biophysics; and
| | - Andrew A Gibb
- Institute of Molecular Cardiology, Department of Medicine; Diabetes and Obesity Center; Department of Physiology and Biophysics; and
| | - Jasmit Shah
- Diabetes and Obesity Center; Department of Bioinformatics and Biostatistics, University of Louisville, Louisville, Kentucky
| | - Nagma Zafar
- Diabetes and Obesity Center; Department of Physiology and Biophysics; and
| | | | - Jason Hellmann
- Institute of Molecular Cardiology, Department of Medicine; Diabetes and Obesity Center
| | - Shesh N Rai
- Diabetes and Obesity Center; Department of Bioinformatics and Biostatistics, University of Louisville, Louisville, Kentucky
| | - Matthew Spite
- Institute of Molecular Cardiology, Department of Medicine; Diabetes and Obesity Center; Department of Physiology and Biophysics; and
| | - Aruni Bhatnagar
- Institute of Molecular Cardiology, Department of Medicine; Diabetes and Obesity Center; Department of Biochemistry and Molecular Biology; Department of Physiology and Biophysics; and
| | - Bradford G Hill
- Institute of Molecular Cardiology, Department of Medicine; Diabetes and Obesity Center; Department of Biochemistry and Molecular Biology; Department of Physiology and Biophysics; and
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Oxidative stress and metabolic pathologies: from an adipocentric point of view. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2014; 2014:908539. [PMID: 25143800 PMCID: PMC4131099 DOI: 10.1155/2014/908539] [Citation(s) in RCA: 154] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/12/2014] [Revised: 05/20/2014] [Accepted: 06/26/2014] [Indexed: 02/07/2023]
Abstract
Oxidative stress plays a pathological role in the development of various diseases including diabetes, atherosclerosis, or cancer. Systemic oxidative stress results from an imbalance between oxidants derivatives production and antioxidants defenses. Reactive oxygen species (ROS) are generally considered to be detrimental for health. However, evidences have been provided that they can act as second messengers in adaptative responses to stress. Obesity represents a major risk factor for deleterious associated pathologies such as type 2 diabetes, liver, and coronary heart diseases. Many evidences regarding obesity-induced oxidative stress accumulated over the past few years based on established correlations of biomarkers or end-products of free-radical-mediated oxidative stress with body mass index. The hypothesis that oxidative stress plays a significant role in the development of metabolic disorders, especially insulin-resistance state, is supported by several studies where treatments reducing ROS production reverse metabolic alterations, notably through improvement of insulin sensitivity, hyperlipidemia, or hepatic steatosis. In this review, we will develop the mechanistic links between oxidative stress generated by adipose tissue in the context of obesity and its impact on metabolic complications development. We will also attempt to discuss potential therapeutic approaches targeting obesity-associated oxidative stress in order to prevent associated-metabolic complications.
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48
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Bollineni RC, Fedorova M, Blüher M, Hoffmann R. Carbonylated plasma proteins as potential biomarkers of obesity induced type 2 diabetes mellitus. J Proteome Res 2014; 13:5081-93. [PMID: 25010493 DOI: 10.1021/pr500324y] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Protein carbonylation is a common nonenzymatic oxidative post-translational modification, which is often considered as biomarker of oxidative stress. Recent evidence links protein carbonylation also to obesity and type 2 diabetes mellitus (T2DM), though the protein targets of carbonylation in human plasma have not been identified. In this study, we profiled carbonylated proteins in plasma samples obtained from lean individuals and obese patients with or without T2DM. The plasma samples were digested with trypsin, carbonyl groups were derivatized with O-(biotinylcarbazoylmethyl)hydroxylamine, enriched by avidin affinity chromatography, and analyzed by RPC-MS/MS. Signals of potentially modified peptides were targeted in a second LC-MS/MS analysis to retrieve the peptide sequence and the modified residues. A total of 158 unique carbonylated proteins were identified, of which 52 were detected in plasma samples of all three groups. Interestingly, 36 carbonylated proteins were detected only in obese patients with T2DM, whereas 18 were detected in both nondiabetic groups. The carbonylated proteins originated mostly from liver, plasma, platelet, and endothelium. Functionally, they were mainly involved in cell adhesion, signaling, angiogenesis, and cytoskeletal remodeling. Among the identified carbonylated proteins were several candidates, such as VEGFR-2, MMP-1, argin, MKK4, and compliment C5, already connected before to diabetes, obesity and metabolic diseases.
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Affiliation(s)
- Ravi Chand Bollineni
- Institute of Bioanalytical Chemistry, Faculty of Chemistry and Mineralogy, ‡Center for Biotechnology and Biomedicine, and §Department of Medicine, Universität Leipzig , Deutscher Platz 5, 04103 Leipzig, Germany
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Jankovic A, Korac A, Srdic-Galic B, Buzadzic B, Otasevic V, Stancic A, Vucetic M, Markelic M, Velickovic K, Golic I, Korac B. Differences in the redox status of human visceral and subcutaneous adipose tissues--relationships to obesity and metabolic risk. Metabolism 2014; 63:661-71. [PMID: 24582138 DOI: 10.1016/j.metabol.2014.01.009] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Revised: 12/23/2013] [Accepted: 01/14/2014] [Indexed: 12/14/2022]
Abstract
OBJECTIVE Metabolic homeostasis depends on adipocyte metabolic responses/processes, most of which are redox-regulated. Besides, visceral and subcutaneous adipose tissues (VAT and SAT, respectively) differ metabolically and in their contribution to metabolic complications, but their redox characteristics in humans are still unknown. To understand the molecular mechanisms of metabolic syndrome development, we analysed the redox characteristics of VAT and SAT in groups with various body weights and metabolic risks. MATERIAL AND METHODS Fifty premenopausal women were classified according to body mass index into normal-weight and obese groups, and these groups were further sub-classified into metabolically healthy and metabolically obese ("at risk") based on the homeostasis model assessment of insulin resistance (HOMA-IR) index and the triglyceride, total-, LDL- and HDL-cholesterol levels. Antioxidant components, NADPH oxidase protein and 4-hydroxynonenal (4-HNE) levels were analysed in VAT and SAT. RESULTS Compared with the SAT, the VAT showed a higher basal level of glutathione (GSH) and GSH-dependent enzyme activities. Compared with the metabolically healthy normal-weight controls, the obese groups of women showed lower GSH levels in both depots. However, in these groups, additional prooxidative changes (increased NADPH oxidase and 4-HNE and decreased levels of SOD and/or CAT) were observed only in VAT. CONCLUSIONS Because of the critical role of thiol-redox homeostasis in lipogenesis, interdepot-differences in the GSH-dependent antioxidant part may be connected to the higher metabolic activity found in VAT. Analogously, the lower GSH levels that occur during obesity and the corresponding additional redox imbalance may be signs of VAT metabolic dysfunction that underlie the subsequent metabolic impairment.
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Affiliation(s)
- Aleksandra Jankovic
- Department of Physiology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 11060 Belgrade, Serbia
| | - Aleksandra Korac
- Center for Electron Microscopy, Faculty of Biology, University of Belgrade, 11000 Belgrade, Serbia
| | - Biljana Srdic-Galic
- Department of Anatomy, Faculty of Medicine, University of Novi Sad, 21000 Novi Sad, Serbia
| | - Biljana Buzadzic
- Department of Physiology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 11060 Belgrade, Serbia
| | - Vesna Otasevic
- Department of Physiology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 11060 Belgrade, Serbia
| | - Ana Stancic
- Department of Physiology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 11060 Belgrade, Serbia
| | - Milica Vucetic
- Department of Physiology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 11060 Belgrade, Serbia
| | - Milica Markelic
- Center for Electron Microscopy, Faculty of Biology, University of Belgrade, 11000 Belgrade, Serbia
| | - Ksenija Velickovic
- Center for Electron Microscopy, Faculty of Biology, University of Belgrade, 11000 Belgrade, Serbia
| | - Igor Golic
- Center for Electron Microscopy, Faculty of Biology, University of Belgrade, 11000 Belgrade, Serbia
| | - Bato Korac
- Department of Physiology, Institute for Biological Research "Sinisa Stankovic", University of Belgrade, 11060 Belgrade, Serbia.
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50
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Hahn WS, Kuzmicic J, Burrill JS, Donoghue MA, Foncea R, Jensen MD, Lavandero S, Arriaga EA, Bernlohr DA. Proinflammatory cytokines differentially regulate adipocyte mitochondrial metabolism, oxidative stress, and dynamics. Am J Physiol Endocrinol Metab 2014; 306:E1033-45. [PMID: 24595304 PMCID: PMC4010657 DOI: 10.1152/ajpendo.00422.2013] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Proinflammatory cytokines differentially regulate adipocyte mitochondrial metabolism, oxidative stress, and dynamics. Macrophage infiltration of adipose tissue and the chronic low-grade production of inflammatory cytokines have been mechanistically linked to the development of insulin resistance, the forerunner of type 2 diabetes mellitus. In this study, we evaluated the chronic effects of TNFα, IL-6, and IL-1β on adipocyte mitochondrial metabolism and morphology using the 3T3-L1 model cell system. TNFα treatment of cultured adipocytes led to significant changes in mitochondrial bioenergetics, including increased proton leak, decreased ΔΨm, increased basal respiration, and decreased ATP turnover. In contrast, although IL-6 and IL-1β decreased maximal respiratory capacity, they had no effect on ΔΨm and varied effects on ATP turnover, proton leak, or basal respiration. Only TNFα treatment of 3T3-L1 cells led to an increase in oxidative stress (as measured by superoxide anion production and protein carbonylation) and C16 ceramide synthesis. Treatment of 3T3-L1 adipocytes with cytokines led to decreased mRNA expression of key transcription factors and control proteins implicated in mitochondrial biogenesis, including PGC-1α and eNOS as well as deceased expression of COX IV and Cyt C. Whereas each cytokine led to effects on expression of mitochondrial markers, TNFα exclusively led to mitochondrial fragmentation and decreased the total level of OPA1 while increasing OPA1 cleavage, without expression of levels of mitofusin 2, DRP-1, or mitofilin being affected. In summary, these results indicate that inflammatory cytokines have unique and specialized effects on adipocyte metabolism, but each leads to decreased mitochondrial function and a reprogramming of fat cell biology.
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Affiliation(s)
- Wendy S Hahn
- Department of Biochemistry, Molecular Biology, and Biophysics, University of Minnesota, Minneapolis, Minnesota
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