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Tang HH, Wang D, Tang CC. Effect of bariatric surgery on metabolism in diabetes and obesity comorbidity: Insight from recent research. World J Diabetes 2024; 15:586-590. [PMID: 38680688 PMCID: PMC11045418 DOI: 10.4239/wjd.v15.i4.586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2023] [Revised: 01/09/2024] [Accepted: 03/01/2024] [Indexed: 04/11/2024] Open
Abstract
Obesity is a prevalent cause of diabetes mellitus (DM) and is a serious danger to human health. Type 2 DM (T2DM) mostly occurs along with obesity. Foodborne obesity-induced DM is caused by an excessive long-term diet and surplus energy. Bariatric surgery can improve the symptoms of T2DM in some obese patients. But different types of bariatric surgery may have different effects. There are some models built by researchers to discuss the surgical procedures' effects on metabolism in diabetes animal models and diabetes patients. It is high time to conclude all this effects and recommend procedures that can better improve metabolism.
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Affiliation(s)
- Hui-Hong Tang
- Department of Cardiology, Zhongda Hospital, Southeast University, Nanjing 210009, Jiangsu Province, China
- School of Medicine, Southeast University, Nanjing 210009, Jiangsu Province, China
| | - Dong Wang
- Department of Cardiology, Zhongda Hospital, Southeast University, Nanjing 210009, Jiangsu Province, China
- School of Medicine, Southeast University, Nanjing 210009, Jiangsu Province, China
| | - Cheng-Chun Tang
- Department of Cardiology, Zhongda Hospital, Southeast University, Nanjing 210009, Jiangsu Province, China
- School of Medicine, Southeast University, Nanjing 210009, Jiangsu Province, China
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2
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Zhao Y, Huang J, Zhao K, Li M, Wang S. Ubiquitination and deubiquitination in the regulation of N 6-methyladenosine functional molecules. J Mol Med (Berl) 2024; 102:337-351. [PMID: 38289385 DOI: 10.1007/s00109-024-02417-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Revised: 10/17/2023] [Accepted: 01/09/2024] [Indexed: 02/21/2024]
Abstract
N6 methyladenosine (m6A) is the most prevalent RNA epigenetic modification, regulated by methyltransferases and demethyltransferases and recognized by methylation-related reading proteins to impact mRNA splicing, translocation, stability, and translation efficiency. It significantly affects a variety of activities, including stem cell maintenance and differentiation, tumor formation, immune regulation, and metabolic disorders. Ubiquitination refers to the specific modification of target proteins by ubiquitin molecule in response to a series of enzymes. E3 ligases connect ubiquitin to target proteins and usually lead to protein degradation. On the contrary, deubiquitination induced by deubiquitinating enzymes (DUBs) can separate ubiquitin and regulate the stability of protein. Recent studies have emphasized the potential importance of ubiquitination and deubiquitination in controlling the function of m6A modification. In this review, we discuss the impact of ubiquitination and deubiquitination on m6A functional molecules in diseases, such as metabolism, cellular stress, and tumor growth.
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Affiliation(s)
- Yue Zhao
- Department of Laboratory Medicine, Affiliated Hospital, Jiangsu University, Jiefang Road No 438, Zhenjiang, 212002, China
- Department of Immunology, Jiangsu Key Laboratory of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, China
| | - Jiaojiao Huang
- Department of Immunology, Jiangsu Key Laboratory of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, China
| | - Kexin Zhao
- Department of Immunology, Jiangsu Key Laboratory of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, China
| | - Min Li
- Department of Immunology, Jiangsu Key Laboratory of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, China
| | - Shengjun Wang
- Department of Laboratory Medicine, Affiliated Hospital, Jiangsu University, Jiefang Road No 438, Zhenjiang, 212002, China.
- Department of Immunology, Jiangsu Key Laboratory of Laboratory Medicine, School of Medicine, Jiangsu University, Zhenjiang, China.
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3
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Ježek P, Jabůrek M, Holendová B, Engstová H, Dlasková A. Mitochondrial Cristae Morphology Reflecting Metabolism, Superoxide Formation, Redox Homeostasis, and Pathology. Antioxid Redox Signal 2023; 39:635-683. [PMID: 36793196 PMCID: PMC10615093 DOI: 10.1089/ars.2022.0173] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Revised: 02/08/2023] [Accepted: 02/09/2023] [Indexed: 02/17/2023]
Abstract
Significance: Mitochondrial (mt) reticulum network in the cell possesses amazing ultramorphology of parallel lamellar cristae, formed by the invaginated inner mitochondrial membrane. Its non-invaginated part, the inner boundary membrane (IBM) forms a cylindrical sandwich with the outer mitochondrial membrane (OMM). Crista membranes (CMs) meet IBM at crista junctions (CJs) of mt cristae organizing system (MICOS) complexes connected to OMM sorting and assembly machinery (SAM). Cristae dimensions, shape, and CJs have characteristic patterns for different metabolic regimes, physiological and pathological situations. Recent Advances: Cristae-shaping proteins were characterized, namely rows of ATP-synthase dimers forming the crista lamella edges, MICOS subunits, optic atrophy 1 (OPA1) isoforms and mitochondrial genome maintenance 1 (MGM1) filaments, prohibitins, and others. Detailed cristae ultramorphology changes were imaged by focused-ion beam/scanning electron microscopy. Dynamics of crista lamellae and mobile CJs were demonstrated by nanoscopy in living cells. With tBID-induced apoptosis a single entirely fused cristae reticulum was observed in a mitochondrial spheroid. Critical Issues: The mobility and composition of MICOS, OPA1, and ATP-synthase dimeric rows regulated by post-translational modifications might be exclusively responsible for cristae morphology changes, but ion fluxes across CM and resulting osmotic forces might be also involved. Inevitably, cristae ultramorphology should reflect also mitochondrial redox homeostasis, but details are unknown. Disordered cristae typically reflect higher superoxide formation. Future Directions: To link redox homeostasis to cristae ultramorphology and define markers, recent progress will help in uncovering mechanisms involved in proton-coupled electron transfer via the respiratory chain and in regulation of cristae architecture, leading to structural determination of superoxide formation sites and cristae ultramorphology changes in diseases. Antioxid. Redox Signal. 39, 635-683.
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Affiliation(s)
- Petr Ježek
- Department No. 75, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Martin Jabůrek
- Department No. 75, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Blanka Holendová
- Department No. 75, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Hana Engstová
- Department No. 75, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Andrea Dlasková
- Department No. 75, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
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4
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Haslem L, Hays JM, Hays FA. p66Shc in Cardiovascular Pathology. Cells 2022; 11:cells11111855. [PMID: 35681549 PMCID: PMC9180016 DOI: 10.3390/cells11111855] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 05/30/2022] [Accepted: 06/01/2022] [Indexed: 02/06/2023] Open
Abstract
p66Shc is a widely expressed protein that governs a variety of cardiovascular pathologies by generating, and exacerbating, pro-apoptotic ROS signals. Here, we review p66Shc’s connections to reactive oxygen species, expression, localization, and discuss p66Shc signaling and mitochondrial functions. Emphasis is placed on recent p66Shc mitochondrial function discoveries including structure/function relationships, ROS identity and regulation, mechanistic insights, and how p66Shc-cyt c interactions can influence p66Shc mitochondrial function. Based on recent findings, a new p66Shc mitochondrial function model is also put forth wherein p66Shc acts as a rheostat that can promote or antagonize apoptosis. A discussion of how the revised p66Shc model fits previous findings in p66Shc-mediated cardiovascular pathology follows.
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Affiliation(s)
- Landon Haslem
- Biochemistry and Molecular Biology Department, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; (L.H.); (J.M.H.)
| | - Jennifer M. Hays
- Biochemistry and Molecular Biology Department, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; (L.H.); (J.M.H.)
| | - Franklin A. Hays
- Biochemistry and Molecular Biology Department, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; (L.H.); (J.M.H.)
- Stephenson Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
- Harold Hamm Diabetes Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
- Correspondence:
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5
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Sheak JR, Yan S, Weise-Cross L, Ahmadian R, Walker BR, Jernigan NL, Resta TC. PKCβ and reactive oxygen species mediate enhanced pulmonary vasoconstrictor reactivity following chronic hypoxia in neonatal rats. Am J Physiol Heart Circ Physiol 2020; 318:H470-H483. [PMID: 31922892 DOI: 10.1152/ajpheart.00629.2019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Reactive oxygen species (ROS), mitochondrial dysfunction, and excessive vasoconstriction are important contributors to chronic hypoxia (CH)-induced neonatal pulmonary hypertension. On the basis of evidence that PKCβ and mitochondrial oxidative stress are involved in several cardiovascular and metabolic disorders, we hypothesized that PKCβ and mitochondrial ROS (mitoROS) signaling contribute to enhanced pulmonary vasoconstriction in neonatal rats exposed to CH. To test this hypothesis, we examined effects of the PKCβ inhibitor LY-333,531, the ROS scavenger 1-oxyl-2,2,6,6-tetramethyl-4-hydroxypiperidine (TEMPOL), and the mitochondrial antioxidants mitoquinone mesylate (MitoQ) and (2-(2,2,6,6-tetramethylpiperidin-1-oxyl-4-ylamino)-2-oxoethyl)triphenylphosphonium chloride (MitoTEMPO) on vasoconstrictor responses in saline-perfused lungs (in situ) or pressurized pulmonary arteries from 2-wk-old control and CH (12-day exposure, 0.5 atm) rats. Lungs from CH rats exhibited greater basal tone and vasoconstrictor sensitivity to 9,11-dideoxy-9α,11α-methanoepoxy prostaglandin F2α (U-46619). LY-333,531 and TEMPOL attenuated these effects of CH, while having no effect in lungs from control animals. Basal tone was similarly elevated in isolated pulmonary arteries from neonatal CH rats compared with control rats, which was inhibited by both LY-333,531 and mitochondria-targeted antioxidants. Additional experiments assessing mitoROS generation with the mitochondria-targeted ROS indicator MitoSOX revealed that a PKCβ-mitochondrial oxidant signaling pathway can be pharmacologically stimulated by the PKC activator phorbol 12-myristate 13-acetate in primary cultures of pulmonary artery smooth muscle cells (PASMCs) from control neonates. Finally, we found that neonatal CH increased mitochondrially localized PKCβ in pulmonary arteries as assessed by Western blotting of subcellular fractions. We conclude that PKCβ activation leads to mitoROS production in PASMCs from neonatal rats. Furthermore, this signaling axis may account for enhanced pulmonary vasoconstrictor sensitivity following CH exposure.NEW & NOTEWORTHY This research demonstrates a novel contribution of PKCβ and mitochondrial reactive oxygen species signaling to increased pulmonary vasoconstrictor reactivity in chronically hypoxic neonates. The results provide a potential mechanism by which chronic hypoxia increases both basal and agonist-induced pulmonary arterial smooth muscle tone, which may contribute to neonatal pulmonary hypertension.
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Affiliation(s)
- Joshua R Sheak
- Vascular Physiology Group, Department of Cell Biology and Physiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico
| | - Simin Yan
- Vascular Physiology Group, Department of Cell Biology and Physiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico
| | - Laura Weise-Cross
- Vascular Physiology Group, Department of Cell Biology and Physiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico
| | - Rosstin Ahmadian
- Vascular Physiology Group, Department of Cell Biology and Physiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico
| | - Benjimen R Walker
- Vascular Physiology Group, Department of Cell Biology and Physiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico
| | - Nikki L Jernigan
- Vascular Physiology Group, Department of Cell Biology and Physiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico
| | - Thomas C Resta
- Vascular Physiology Group, Department of Cell Biology and Physiology, University of New Mexico Health Sciences Center, Albuquerque, New Mexico
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6
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Yi H, Xu D, Wu X, Xu F, Lin L, Zhou H. Isosteviol Protects Free Fatty Acid- and High Fat Diet-Induced Hepatic Injury via Modulating PKC-β/p66Shc/ROS and Endoplasmic Reticulum Stress Pathways. Antioxid Redox Signal 2019; 30:1949-1968. [PMID: 30484323 PMCID: PMC6486675 DOI: 10.1089/ars.2018.7521] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Aims: Nonalcoholic fatty liver disease (NAFLD) is the most common cause of chronic liver diseases. However, there are no approved pharmacotherapies for the treatment of NAFLD other than managing life style and controlling diets. Extensive studies have demonstrated that multiple mechanisms are involved in free fatty acid (FFA)- and high fat diet (HFD)-induced hepatic injury, including mitochondrial dysfunction, activation of oxidative stress and endoplasmic reticulum (ER) stress, and lysosome dysfunction. A previous study reported that Isosteviol (ISV), a derivative of stevioside, prevents HFD-induced hepatic injury. However, the underlying mechanisms remain unclear. Results: In this study, we examined the potential cellular/molecular mechanisms underlying ISV-mediated protective effect against FFA-/HFD-induced hepatic lipotoxicity by using both in vitro primary rat hepatocytes and the in vivo rat NAFLD model. The results indicated that ISV inhibits FFA-/HFD-induced hepatic injury via reducing oxidative and ER stress. Specifically, ISV inhibited the expression, activation, and mitochondrial translocation of Src-homology-2-domain-containing transforming protein 1 (p66Shc), an adapter protein that mediates oxidative stress-induced injury and is a substrate of protein kinase C-β (PKC-β), via inhibition of PKC-β activity. However, ISV had no effect on the expression and activity of peptidyl-prolyl cis-trans isomerase and serine/threonine protein phosphatase 2A, isomerase and phosphorylase of p66Shc. In addition, ISV also inhibited FFA-induced ER stress and decreased ER-mitochondrial interaction. Innovation and Conclusion: We first identified that ISV prevents FFA-/HFD-induced hepatic injury through modulating PKC-β/p66Shc/oxidative and ER stress pathways. ISV represents a promising therapeutic agent for NAFLD in the future. Antioxid. Redox Signal. 30, 1949-1968.
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Affiliation(s)
- Hongwei Yi
- 1 Department of Pharmacology, School of Medicine, Southeast University, Nanjing, China
| | - Deyi Xu
- 1 Department of Pharmacology, School of Medicine, Southeast University, Nanjing, China
| | - Xudong Wu
- 2 State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, China
| | - Fang Xu
- 2 State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, China
| | - Lin Lin
- 1 Department of Pharmacology, School of Medicine, Southeast University, Nanjing, China
| | - Huiping Zhou
- 3 Department of Microbiology and Immunology, Virginia Commonwealth University and McGuire Veterans Affairs Medical Center, Richmond, Virginia
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7
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Tai H, Wang X, Zhou J, Han X, Fang T, Gong H, Huang N, Chen H, Qin J, Yang M, Wei X, Yang L, Xiao H. Protein kinase Cβ activates fat mass and obesity-associated protein by influencing its ubiquitin/proteasome degradation. FASEB J 2017. [PMID: 28626026 DOI: 10.1096/fj.201601159rr] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Protein kinase Cβ (PKCβ) is a serine-threonine kinase associated with obesity and diabetic complications; its activation contributes to weight gain, and deletion of its gene results in resistance to genetic- and diet-induced obesity. Fat mass and obesity-associated (FTO) protein is a recently identified RNA demethylase, and its overexpression in mice leads to increased body weight as well as fat mass. Although sharing some features in anabolism regulation, PKCβ and FTO have not been investigated together; therefore, their relationship has not been established. We report that PKCβ positively regulates FTO on the posttranslation level, evidenced by the facts that PKCβ activation contributes to high-glucose-induced FTO up-regulation, and overexpression of PKCβ suppresses ubiquitin-proteasome degradation of FTO, whereas PKCβ inactivation acts in the opposite manner. It was also found that PKCβ can phosphorylate FTO on threonine, and this phosphorylation requires both catalytic and regulatory domains of PKCβ. Moreover, PKCβ inhibition can suppress 3T3-L1 cell differentiation in normal and FTO-overexpressing cells but not in FTO-silenced or -inhibited cells. We propose that PKCβ acts to suppress the degradation of FTO protein and reveals the associated role of PKCβ and FTO in adipogenesis, suggesting a new pathway that affects the development of obesity and metabolic diseases.-Tai, H., Wang, X., Zhou, J., Han, X., Fang, T., Gong, H., Huang, N., Chen, H., Qin, J., Yang, M., Wei, X., Yang, L., Xiao, H. Protein kinase Cβ activates fat mass and obesity-associated protein by influencing its ubiquitin/proteasome degradation.
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Affiliation(s)
- Haoran Tai
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
| | - Xiaobo Wang
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
| | - Jiao Zhou
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
| | - Xiaojuan Han
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
| | - Tingting Fang
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
| | - Hui Gong
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
| | - Ning Huang
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
| | - Honghan Chen
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
| | - Jianqiong Qin
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
| | - Ming Yang
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
| | - Xiawei Wei
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
| | - Li Yang
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
| | - Hengyi Xiao
- Laboratory for Aging Research, Center of Gerontology and Geriatrics, State Key Laboratory of Biotherapy, West China Hospital, Collaborative Innovation Center of Biotherapy, Sichuan University, Chengdu, China
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8
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Di Lisa F, Giorgio M, Ferdinandy P, Schulz R. New aspects of p66Shc in ischaemia reperfusion injury and other cardiovascular diseases. Br J Pharmacol 2017; 174:1690-1703. [PMID: 26990284 PMCID: PMC5446581 DOI: 10.1111/bph.13478] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2015] [Revised: 02/29/2016] [Accepted: 03/09/2016] [Indexed: 12/13/2022] Open
Abstract
Although reactive oxygen species (ROS) act as crucial factors in the onset and progression of a wide array of diseases, they are also involved in numerous signalling pathways related to cell metabolism, growth and survival. ROS are produced at various cellular sites, and it is generally agreed that mitochondria generate the largest amount, especially those in cardiomyocytes. However, the identification of the most relevant sites within mitochondria, the interaction among the various sources, and the events responsible for the increase in ROS formation under pathological conditions are still highly debated, and far from being clarified. Here, we review the information linking the adaptor protein p66Shc with cardiac injury induced by ischaemia and reperfusion (I/R), including the contribution of risk factors, such as metabolic syndrome and ageing. In response to several stimuli, p66Shc migrates into mitochondria where it catalyses electron transfer from cytochrome c to oxygen resulting in hydrogen peroxide formation. Deletion of p66Shc has been shown to reduce I/R injury as well as vascular abnormalities associated with diabetes and ageing. However, p66Shc-induced ROS formation is also involved in insulin signalling and might contribute to self-endogenous defenses against mild I/R injury. In addition to its role in physiological and pathological conditions, we discuss compounds and conditions that can modulate the expression and activity of p66Shc. LINKED ARTICLES This article is part of a themed section on Redox Biology and Oxidative Stress in Health and Disease. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v174.12/issuetoc.
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Affiliation(s)
- Fabio Di Lisa
- Department of Biomedical Sciences and CNR Neuroscience InstituteUniversity of PadovaPadovaItaly
| | - Marco Giorgio
- Department of Experimental OncologyInstitute of OncologyMilanItaly
| | - Peter Ferdinandy
- Department of Pharmacology and PharmacotherapySemmelweis UniversityBudapestHungary
- Pharmahungary GroupSzegedHungary
| | - Rainer Schulz
- Institut für PhysiologieJustus‐Liebig Universität GiessenGiessenGermany
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9
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Mehta D, Mehta KD. PKCβ: Expanding role in hepatic adaptation of cholesterol homeostasis to dietary fat/cholesterol. Am J Physiol Gastrointest Liver Physiol 2017; 312:G266-G273. [PMID: 28104587 PMCID: PMC5401991 DOI: 10.1152/ajpgi.00373.2016] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 01/11/2017] [Accepted: 01/17/2017] [Indexed: 01/31/2023]
Abstract
Cholesterol homeostasis relies on an intricate network of cellular processes whose deregulation in response to Western type high-fat/cholesterol diets can lead to several life-threatening pathologies. Significant advances have been made in resolving the molecular identity and regulatory function of transcription factors sensitive to fat, cholesterol, or bile acids, but whether body senses the presence of both fat and cholesterol simultaneously is not known. Assessing the impact of a high-fat/cholesterol load, rather than an individual component alone, on cholesterol homeostasis is more physiologically relevant because Western diets deliver both fat and cholesterol at the same time. Moreover, dietary fat and dietary cholesterol are reported to act synergistically to impair liver cholesterol homeostasis. A key insight into the role of protein kinase C-β (PKCβ) in hepatic adaptation to high-fat/cholesterol diets was gained recently through the use of knockout mice. The emerging evidence indicates that PKCβ is an important regulator of cholesterol homeostasis that ensures normal adaptation to high-fat/cholesterol intake. Consistent with this function, high-fat/cholesterol diets induce PKCβ expression and signaling in the intestine and liver, while systemic PKCβ deficiency promotes accumulation of cholesterol in the liver and bile. PKCβ disruption results in profound dysregulation of hepatic cholesterol and bile homeostasis and imparts sensitivity to cholesterol gallstone formation. The available results support involvement of a two-pronged mechanism by which intestine and liver PKCβ signaling converge on liver ERK1/2 to dictate diet-induced cholesterol and bile acid homeostasis. Collectively, PKCβ is an integrator of dietary fat/cholesterol signal and mediates changes to cholesterol homeostasis.
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Affiliation(s)
- Devina Mehta
- 1Department of Medicine, University of Cincinnati College of Medicine, Cincinnati, Ohio; and
| | - Kamal D. Mehta
- 2Department of Biological Chemistry and Pharmacology, Dorothy M. Davis Heart & Lung Research Institute, The Ohio State University Wexner Medical Center, Columbus, Ohio
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10
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Vono R, Fuoco C, Testa S, Pirrò S, Maselli D, Ferland McCollough D, Sangalli E, Pintus G, Giordo R, Finzi G, Sessa F, Cardani R, Gotti A, Losa S, Cesareni G, Rizzi R, Bearzi C, Cannata S, Spinetti G, Gargioli C, Madeddu P. Activation of the Pro-Oxidant PKCβII-p66Shc Signaling Pathway Contributes to Pericyte Dysfunction in Skeletal Muscles of Patients With Diabetes With Critical Limb Ischemia. Diabetes 2016; 65:3691-3704. [PMID: 27600065 DOI: 10.2337/db16-0248] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Accepted: 08/24/2016] [Indexed: 11/13/2022]
Abstract
Critical limb ischemia (CLI), foot ulcers, former amputation, and impaired regeneration are independent risk factors for limb amputation in subjects with diabetes. The present work investigates whether and by which mechanism diabetes negatively impacts on functional properties of muscular pericytes (MPs), which are resident stem cells committed to reparative angiomyogenesis. We obtained muscle biopsy samples from patients with diabetes who were undergoing major limb amputation and control subjects. Diabetic muscles collected at the rim of normal tissue surrounding the plane of dissection showed myofiber degeneration, fat deposition, and reduction of MP vascular coverage. Diabetic MPs (D-MPs) display ultrastructural alterations, a differentiation bias toward adipogenesis at the detriment of myogenesis and an inhibitory activity on angiogenesis. Furthermore, they have an imbalanced redox state, with downregulation of the antioxidant enzymes superoxide dismutase 1 and catalase, and activation of the pro-oxidant protein kinase C isoform β-II (PKCβII)-dependent p66Shc signaling pathway. A reactive oxygen species scavenger or, even more effectively, clinically approved PKCβII inhibitors restore D-MP angiomyogenic activity. Inhibition of the PKCβII-dependent p66Shc signaling pathway could represent a novel therapeutic approach for the promotion of muscle repair in individuals with diabetes.
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Affiliation(s)
- Rosa Vono
- Istituto di Ricovero e Cura a Carattere Scientifico, MultiMedica, Milan, Italy
| | - Claudia Fuoco
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Stefano Testa
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Stefano Pirrò
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Davide Maselli
- Istituto di Ricovero e Cura a Carattere Scientifico, MultiMedica, Milan, Italy
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
| | | | - Elena Sangalli
- Istituto di Ricovero e Cura a Carattere Scientifico, MultiMedica, Milan, Italy
| | - Gianfranco Pintus
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
- Department of Biomedical Sciences, College of Health Sciences, Qatar University, Doha, Qatar
| | - Roberta Giordo
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
| | - Giovanna Finzi
- Department of Pathology, University of Insubria/Ospedale di Circolo, Varese, Italy
| | - Fausto Sessa
- Department of Pathology, University of Insubria/Ospedale di Circolo, Varese, Italy
| | - Rosanna Cardani
- Laboratory of Muscle Histopathology and Molecular Biology, Istituto di Ricovero e Cura a Carattere Scientifico-Policlinico San Donato, Milan, Italy
| | - Ambra Gotti
- Istituto di Ricovero e Cura a Carattere Scientifico, MultiMedica, Milan, Italy
| | - Sergio Losa
- Istituto di Ricovero e Cura a Carattere Scientifico, MultiMedica, Milan, Italy
| | - Gianni Cesareni
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Roberto Rizzi
- Istituto di Ricovero e Cura a Carattere Scientifico, MultiMedica, Milan, Italy
- Cell Biology and Neurobiology Institute, National Research Council of Italy, Rome, Italy
| | - Claudia Bearzi
- Istituto di Ricovero e Cura a Carattere Scientifico, MultiMedica, Milan, Italy
- Cell Biology and Neurobiology Institute, National Research Council of Italy, Rome, Italy
| | - Stefano Cannata
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Gaia Spinetti
- Istituto di Ricovero e Cura a Carattere Scientifico, MultiMedica, Milan, Italy
| | - Cesare Gargioli
- Department of Biology, University of Rome Tor Vergata, Rome, Italy
| | - Paolo Madeddu
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
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11
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Dietary flavones counteract phorbol 12-myristate 13-acetate-induced SREBP-2 processing in hepatic cells. Mol Cell Biochem 2016; 424:163-172. [PMID: 27778136 DOI: 10.1007/s11010-016-2851-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Accepted: 10/14/2016] [Indexed: 01/09/2023]
Abstract
Consumption of fruits and vegetables is generally regarded as beneficial to plasma lipid profile. The mechanism by which the plant foods induce desirable lipid changes remains unclear. SREBP-2 is crucial in cholesterol metabolism, and it is a major regulator of the cholesterol biosynthesis enzyme HMGCR. Our lab has previously illustrated that apigenin and luteolin could attenuate the nuclear translocation of SREBP-2 through an AMPK-dependent pathway. In the present study, these two flavones were studied for their ability to deter the same in an AMPK-independent signaling route. The processing of SREBP-2 protein was promoted by phorbol 12-myristate 13-acetate (PMA) in the hepatic cells WRL and HepG2, and the increased processing was reversed by apigenin or luteolin co-administration. EMSA results demonstrated that the PMA-induced DNA-binding activity was weakened by the flavones. The increased amount of nuclear SREBP-2 in cells was attenuated by the flavonoid as shown by immunocytochemical imaging. Quantitative reverse transcriptase-polymerase chain reaction assay demonstrated that the transcription of HMGCR under both flavone treatments was reduced. However, apigenin appeared to be stronger than luteolin in restraining PMA-induced HMGCR mRNA expression. Since PMA is a diacylglycerol analog, these findings might have some physiological implications.
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12
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Plecitá-Hlavatá L, Ježek P. Integration of superoxide formation and cristae morphology for mitochondrial redox signaling. Int J Biochem Cell Biol 2016; 80:31-50. [PMID: 27640755 DOI: 10.1016/j.biocel.2016.09.010] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2016] [Revised: 09/09/2016] [Accepted: 09/12/2016] [Indexed: 12/16/2022]
Abstract
The mitochondrial network provides the central cell's energetic and regulatory unit, which besides ATP and metabolite production participates in cellular signaling through regulated reactive oxygen species (ROS) production and various protein/ion fluxes. The inner membrane forms extensive folds, called cristae, i.e. cavities enfolded from and situated perpendicularly to its inner boundary membrane portion, which encompasses an inner cylinder within the outer membrane tubule. Mitochondrial cristae ultramorphology reflects various metabolic, physiological or pathological states. Since the mitochondrion is typically a predominant superoxide source and generated ROS also serve for the creation of information redox signals, we review known relationships between ROS generation within the respiratory chain complexes of cristae and cristae morphology. Notably, it is emphasized that cristae shape is governed by ATP-synthase dimers, MICOS complexes, OPA1 isoforms and the umbrella of their regulation, and also dependent on local protonmotive force (electrical potential component) in cristae. Cristae are also affected by redox-sensitive kinases/phosphatases or p66SHC. ATP-synthase dimers decrease in the inflated intracristal space, diminishing pH and hypothetically having minimal superoxide formation. Matrix-released signaling superoxide/H2O2 is predominantly integrated along mitochondrial tubules, whereas the diffusion of intracristal signaling ROS species is controlled by crista junctions, the widening of which enables specific retrograde redox signaling such as during hypoxic cell adaptation. Other physiological cases of H2O2 release from the mitochondrion include the modulation of insulin release in pancreatic β-cells, enhancement of insulin signaling in peripheral tissues, signaling by T-cell receptors, retrograde signaling during the cell cycle and cell differentiation, specifically that of adipocytes.
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Affiliation(s)
- Lydie Plecitá-Hlavatá
- Department of Membrane Transport Biophysics, No.75, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Petr Ježek
- Department of Membrane Transport Biophysics, No.75, Institute of Physiology, Academy of Sciences of the Czech Republic, Prague, Czech Republic.
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13
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Phorbol 12-myristate 13-acetate promotes nuclear translocation of hepatic steroid response element binding protein-2. Int J Biochem Cell Biol 2016; 75:1-10. [PMID: 27032751 DOI: 10.1016/j.biocel.2016.03.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Revised: 03/16/2016] [Accepted: 03/21/2016] [Indexed: 11/22/2022]
Abstract
Sterol regulatory element-binding protein (SREBP)-2 is a pivotal transcriptional factor in cholesterol metabolism. Factors interfering with the proper functioning of SREBP-2 potentially alter plasma lipid profiles. Phorbol 12-myristate 13-acetate (PMA), which is a common protein kinase C (PKC) activator, was shown to promote the post-translational processing and nuclear translocation of SREBP-2 in hepatic cells in the current study. Following SREBP-2 translocation, the transcripts of its target genes HMGCR and LDLR were upregulated as demonstrated by quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) assay. Electrophoretic mobility shift assays (EMSA) also demonstrated an induced DNA-binding activity on the sterol response element (SRE) domain under PMA treatment. The increase of activated Srebp-2 without the concurrent induced mRNA expression was also observed in an animal model. As the expression of SREBP-2 was not increased by PMA, the activation of PKC was the focus of investigation. Specific PKC isozyme inhibition and overexpression supported that PKCβ was responsible for the promoting effect. Further studies showed that the mitogen-activated protein kinases (MAPKs) extracellular signal-regulated kinases (ERK) and c-Jun N-terminal kinases (JNK), but not 5' adenosine monophosphate-activated protein kinase (AMPK), were the possible downstream signaling proteins of PKCβ. In conclusion, this study illustrated that PKCβ increased SREBP-2 nuclear translocation in a pathway mediated by MEK/ERK and JNK, rather than the one dictated by AMPK. These results revealed a novel signaling target of PKCβ in the liver cells.
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14
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Okada K, LeClair KB, Zhang Y, Li Y, Ozdemir C, Krisko TI, Hagen SJ, Betensky RA, Banks AS, Cohen DE. Thioesterase superfamily member 1 suppresses cold thermogenesis by limiting the oxidation of lipid droplet-derived fatty acids in brown adipose tissue. Mol Metab 2016; 5:340-351. [PMID: 27110486 PMCID: PMC4837299 DOI: 10.1016/j.molmet.2016.02.002] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 02/09/2016] [Accepted: 02/12/2016] [Indexed: 12/22/2022] Open
Abstract
OBJECTIVE Non-shivering thermogenesis in brown adipose tissue (BAT) plays a central role in energy homeostasis. Thioesterase superfamily member 1 (Them1), a BAT-enriched long chain fatty acyl-CoA thioesterase, is upregulated by cold and downregulated by warm ambient temperatures. Them1 (-/-) mice exhibit increased energy expenditure and resistance to diet-induced obesity and diabetes, but the mechanistic contribution of Them1 to the regulation of cold thermogenesis remains unknown. METHODS Them1 (-/-) and Them1 (+/+) mice were subjected to continuous metabolic monitoring to quantify the effects of ambient temperatures ranging from thermoneutrality (30 °C) to cold (4 °C) on energy expenditure, core body temperature, physical activity and food intake. The effects of Them1 expression on O2 consumption rates, thermogenic gene expression and lipolytic protein activation were determined ex vivo in BAT and in primary brown adipocytes. RESULTS Them1 suppressed thermogenesis in mice even in the setting of ongoing cold exposure. Without affecting thermogenic gene transcription, Them1 reduced O2 consumption rates in both isolated BAT and primary brown adipocytes. This was attributable to decreased mitochondrial oxidation of endogenous but not exogenous fatty acids. CONCLUSIONS These results show that Them1 may act as a break on uncontrolled heat production and limit the extent of energy expenditure. Pharmacologic inhibition of Them1 could provide a targeted strategy for the management of metabolic disorders via activation of brown fat.
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Key Words
- ASM, acid soluble metabolites
- AUC, area under the curve
- Acot, acyl-CoA thioesterase
- Acyl-CoA thioesterase
- Ascl, long chain acyl-CoA synthetase
- Atgl, adipose triglyceride lipase
- BAT, brown adipose tissue
- BFIT, brown fat inducible thioesterase
- CPT, carnitine palmitoyl transferase
- Energy expenditure
- FCCP, carbonyl cyanide-p-trifluoromethoxyphenylhydrazone
- FFA, free fatty acids
- Fabp, fatty acid binding protein
- Fatty acyl-CoA
- Hsl, hormone sensitive lipase
- MOI, multiplicity of infection
- Mitochondria
- NE, norepinephrine
- OCR, oxygen consumption rate
- Obesity
- PKC, protein kinase C
- Plin, perilipin
- Ppar, peroxisome proliferator-activated receptor
- RER, respiratory exchange rate
- START, steroidogenic acute regulatory protein-related lipid transfer
- Them1, thioesterase superfamily member
- UCP, uncoupling protein
- WAT, white adipose tissue
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Affiliation(s)
- Kosuke Okada
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Katherine B LeClair
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Yongzhao Zhang
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Yingxia Li
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Cafer Ozdemir
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Tibor I Krisko
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - Susan J Hagen
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Rebecca A Betensky
- Department of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Alexander S Banks
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA
| | - David E Cohen
- Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, MA, USA.
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