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Ouyang Z, Zhong J, Shen J, Zeng Y. The cell origins of foam cell and lipid metabolism regulated by mechanical stress in atherosclerosis. Front Physiol 2023; 14:1179828. [PMID: 37123258 PMCID: PMC10133704 DOI: 10.3389/fphys.2023.1179828] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 04/04/2023] [Indexed: 05/02/2023] Open
Abstract
Atherosclerosis is an inflammatory disease initiated by endothelial activation, in which lipoprotein, cholesterol, extracellular matrix, and various types of immune and non-immune cells are accumulated and formed into plaques on the arterial wall suffering from disturbed flow, characterized by low and oscillating shear stress. Foam cells are a major cellular component in atherosclerotic plaques, which play an indispensable role in the occurrence, development and rupture of atherosclerotic plaques. It was previously believed that foam cells were derived from macrophages or smooth muscle cells, but recent studies have suggested that there are other sources of foam cells. Many studies have found that the distribution of atherosclerotic plaques is not random but distributed at the bend and bifurcation of the arterial tree. The development and rupture of atherosclerotic plaque are affected by mechanical stress. In this review, we reviewed the advances in foam cell formation in atherosclerosis and the regulation of atherosclerotic plaque and lipid metabolism by mechanical forces. These findings provide new clues for investigating the mechanisms of atherosclerotic plaque formation and progression.
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Zhu T, Wang Z, Zou T, Xu L, Zhang S, Chen Y, Chen C, Zhang W, Wang S, Ding Q, Xu G. SOAT1 Promotes Gastric Cancer Lymph Node Metastasis Through Lipid Synthesis. Front Pharmacol 2021; 12:769647. [PMID: 34790132 PMCID: PMC8591064 DOI: 10.3389/fphar.2021.769647] [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: 09/02/2021] [Accepted: 10/19/2021] [Indexed: 12/25/2022] Open
Abstract
Emerging evidences demonstrate that metabolic reprogramming is a hallmark of malignancies, including gastric cancer (GC). Abnormal expression of metabolic rate-limiting enzymes, as the executive medium of energy metabolism, drives the occurrence and development of cancer. However, a comprehensive model of metabolic rate-limiting enzymes associated with the development and progression of GC remains unclear. In this research, we identified a rate-limiting enzyme, sterol O-acyltransferase 1 (SOAT1), was highly expressed in cancerous tissues, which was associated with advanced tumor stage and lymph node metastasis, leading to the poor prognosis of GC. It was shown that knockdown of SOAT1 or pharmacological inhibition of SOAT1 by avasimibe could suppress GC cell proliferation, cholesterol ester synthesis, and lymphangiogenesis. However, overexpression of SOAT1 promoted these biological processes. Mechanistically, SOAT1 regulated the expression of cholesterol metabolism genes SREBP1 and SREBP2, which could induce lymphangiogenesis via increasing the expression of VEGF-C. In conclusion, our results indicated that SOAT1 promotes gastric cancer lymph node metastasis through lipid synthesis, which suggested that it may be a promising prognostic biomarker for guiding clinical management and treatment decisions.
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Affiliation(s)
- Tingting Zhu
- Department of Gastroenterology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Zhangding Wang
- Department of Gastroenterology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Tianhui Zou
- Division of Gastroenterology and Hepatology, Renji Hospital, Shanghai Jiao-Tong University School of Medicine, Shanghai Institute of Digestive Disease, Key Laboratory of Gastroenterology and Hepatology, Ministry of Health, Shanghai, China
| | - Lei Xu
- Department of Gastroenterology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Shu Zhang
- Department of Gastroenterology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Yali Chen
- Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, China
| | - Chen Chen
- Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, China
| | - Weijie Zhang
- Department of Thyroid and Breast Surgery, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
| | - Shouyu Wang
- Jiangsu Key Laboratory of Molecular Medicine, Medical School of Nanjing University, Nanjing, China.,Department of Hepatobiliary Surgery, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China.,Center for Public Health Research, Medical School of Nanjing University, Nanjing, China
| | - Qingqing Ding
- Department of Gerontology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Guifang Xu
- Department of Gastroenterology, The Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing, China
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Hai Q, Smith JD. Acyl-Coenzyme A: Cholesterol Acyltransferase (ACAT) in Cholesterol Metabolism: From Its Discovery to Clinical Trials and the Genomics Era. Metabolites 2021; 11:metabo11080543. [PMID: 34436484 PMCID: PMC8398989 DOI: 10.3390/metabo11080543] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 08/10/2021] [Accepted: 08/12/2021] [Indexed: 11/16/2022] Open
Abstract
The purification and cloning of the acyl-coenzyme A: cholesterol acyltransferase (ACAT) enzymes and the sterol O-acyltransferase (SOAT) genes has opened new areas of interest in cholesterol metabolism given their profound effects on foam cell biology and intestinal lipid absorption. The generation of mouse models deficient in Soat1 or Soat2 confirmed the importance of their gene products on cholesterol esterification and lipoprotein physiology. Although these studies supported clinical trials which used non-selective ACAT inhibitors, these trials did not report benefits, and one showed an increased risk. Early genetic studies have implicated common variants in both genes with human traits, including lipoprotein levels, coronary artery disease, and Alzheimer’s disease; however, modern genome-wide association studies have not replicated these associations. In contrast, the common SOAT1 variants are most reproducibly associated with testosterone levels.
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Correa Y, Waldie S, Thépaut M, Micciulla S, Moulin M, Fieschi F, Pichler H, Trevor Forsyth V, Haertlein M, Cárdenas M. SARS-CoV-2 spike protein removes lipids from model membranes and interferes with the capacity of high density lipoprotein to exchange lipids. J Colloid Interface Sci 2021; 602:732-739. [PMID: 34157514 PMCID: PMC8195693 DOI: 10.1016/j.jcis.2021.06.056] [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: 03/27/2021] [Revised: 06/08/2021] [Accepted: 06/09/2021] [Indexed: 01/18/2023]
Abstract
Cholesterol has been shown to affect the extent of coronavirus binding and fusion to cellular membranes. The severity of Covid-19 infection is also known to be correlated with lipid disorders. Furthermore, the levels of both serum cholesterol and high-density lipoprotein (HDL) decrease with Covid-19 severity, with normal levels resuming once the infection has passed. Here we demonstrate that the SARS-CoV-2 spike (S) protein interferes with the function of lipoproteins, and that this is dependent on cholesterol. In particular, the ability of HDL to exchange lipids from model cellular membranes is altered when co-incubated with the spike protein. Additionally, the S protein removes lipids and cholesterol from model membranes. We propose that the S protein affects HDL function by removing lipids from it and remodelling its composition/structure.
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Affiliation(s)
- Yubexi Correa
- Biofilms - Research Center for Biointerfaces and Department of Biomedical Science, Faculty of Health and Society, Malmö University, 20506 Malmö, Sweden
| | - Sarah Waldie
- Biofilms - Research Center for Biointerfaces and Department of Biomedical Science, Faculty of Health and Society, Malmö University, 20506 Malmö, Sweden; Life Sciences Group, Institut Laue Langevin, Grenoble F-38042, France; Partnership for Structural Biology, Grenoble F-38042, France
| | - Michel Thépaut
- Univ. Grenoble Alpes, CNRS, CEA, IBS, 71 avenue des Martyrs, F-38000 Grenoble, France
| | - Samantha Micciulla
- Large Scale Structures, Institut Laue Langevin (ILL), Grenoble F-38042, France
| | - Martine Moulin
- Life Sciences Group, Institut Laue Langevin, Grenoble F-38042, France; Partnership for Structural Biology, Grenoble F-38042, France
| | - Franck Fieschi
- Partnership for Structural Biology, Grenoble F-38042, France; Univ. Grenoble Alpes, CNRS, CEA, IBS, 71 avenue des Martyrs, F-38000 Grenoble, France
| | - Harald Pichler
- Austrian Centre of Industrial Biotechnology, Petersgasse 14, 8010 Graz, Austria; Graz University of Technology, Institute of Molecular Biotechnology, NAWI Graz, BioTechMed Graz, Petersgasse 14, 8010 Graz, Austria
| | - V Trevor Forsyth
- Life Sciences Group, Institut Laue Langevin, Grenoble F-38042, France; Partnership for Structural Biology, Grenoble F-38042, France; Faculty of Natural Sciences, Keele University, Staffordshire ST5 5BG, UK.
| | - Michael Haertlein
- Life Sciences Group, Institut Laue Langevin, Grenoble F-38042, France; Partnership for Structural Biology, Grenoble F-38042, France.
| | - Marité Cárdenas
- Biofilms - Research Center for Biointerfaces and Department of Biomedical Science, Faculty of Health and Society, Malmö University, 20506 Malmö, Sweden.
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Lemmer IL, Willemsen N, Hilal N, Bartelt A. A guide to understanding endoplasmic reticulum stress in metabolic disorders. Mol Metab 2021; 47:101169. [PMID: 33484951 PMCID: PMC7887651 DOI: 10.1016/j.molmet.2021.101169] [Citation(s) in RCA: 136] [Impact Index Per Article: 45.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/10/2020] [Revised: 01/08/2021] [Accepted: 01/18/2021] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND The global rise of metabolic disorders, such as obesity, type 2 diabetes, and cardiovascular disease, demands a thorough molecular understanding of the cellular mechanisms that govern health or disease. The endoplasmic reticulum (ER) is a key organelle for cellular function and metabolic adaptation and, therefore disturbed ER function, known as "ER stress," is a key feature of metabolic disorders. SCOPE OF REVIEW As ER stress remains a poorly defined phenomenon, this review provides a general guide to understanding the nature, etiology, and consequences of ER stress in metabolic disorders. We define ER stress by its type of stressor, which is driven by proteotoxicity, lipotoxicity, and/or glucotoxicity. We discuss the implications of ER stress in metabolic disorders by reviewing evidence implicating ER phenotypes and organelle communication, protein quality control, calcium homeostasis, lipid and carbohydrate metabolism, and inflammation as key mechanisms in the development of ER stress and metabolic dysfunction. MAJOR CONCLUSIONS In mammalian biology, ER is a phenotypically and functionally diverse platform for nutrient sensing, which is critical for cell type-specific metabolic control by hepatocytes, adipocytes, muscle cells, and neurons. In these cells, ER stress is a distinct, transient state of functional imbalance, which is usually resolved by the activation of adaptive programs such as the unfolded protein response (UPR), ER-associated protein degradation (ERAD), or autophagy. However, challenges to proteostasis also impact lipid and glucose metabolism and vice versa. In the ER, sensing and adaptive measures are integrated and failure of the ER to adapt leads to aberrant metabolism, organelle dysfunction, insulin resistance, and inflammation. In conclusion, the ER is intricately linked to a wide spectrum of cellular functions and is a critical component in maintaining and restoring metabolic health.
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Affiliation(s)
- Imke L Lemmer
- Institute for Cardiovascular Prevention (IPEK), Pettenkoferstr. 9, Ludwig-Maximilians-University, 80336 Munich, Germany; Institute for Diabetes and Cancer (IDC), Helmholtz Center Munich, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany
| | - Nienke Willemsen
- Institute for Cardiovascular Prevention (IPEK), Pettenkoferstr. 9, Ludwig-Maximilians-University, 80336 Munich, Germany
| | - Nazia Hilal
- Institute for Cardiovascular Prevention (IPEK), Pettenkoferstr. 9, Ludwig-Maximilians-University, 80336 Munich, Germany
| | - Alexander Bartelt
- Institute for Cardiovascular Prevention (IPEK), Pettenkoferstr. 9, Ludwig-Maximilians-University, 80336 Munich, Germany; Institute for Diabetes and Cancer (IDC), Helmholtz Center Munich, Ingolstädter Landstr. 1, 85764 Neuherberg, Germany; German Center for Cardiovascular Research (DZHK), Partner Site Munich Heart Alliance, Munich, Technische Universität München, Biedersteiner Str. 29, 80802 München, Germany; Department of Molecular Metabolism, 665 Huntington Avenue, Harvard T.H. Chan School of Public Health, 02115 Boston, MA, USA.
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Zhang Z, Bai J, Zeng Y, Cai M, Yao Y, Wu H, You L, Dong X, Ni J. Pharmacology, toxicity and pharmacokinetics of acetylshikonin: a review. PHARMACEUTICAL BIOLOGY 2020; 58:950-958. [PMID: 32956595 PMCID: PMC7534356 DOI: 10.1080/13880209.2020.1818793] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
CONTEXT Acetylshikonin, a naphthoquinone derivative, is mainly extracted from some species of the family Boraginaceae, such as Lithospermum erythrorhizon Sieb. et Zucc., Arnebia euchroma (Royle) Johnst., and Arnebia guttata Bunge. As a bioactive compound, acetylshikonin has attracted much attention because of its broad pharmacological properties. OBJECTIVE This review provides a comprehensive summary of the pharmacology, toxicity, and pharmacokinetics of acetylshikonin focussing on its mechanisms on the basis of currently available literature. METHODS The information of acetylshikonin from 1977 to 2020 was collected using major databases including Elsevier, Scholar, PubMed, Springer, Web of Science, and CNKI. Acetylshikonin, pharmacology, toxicity, pharmacokinetics, and naphthoquinone derivative were used as key words. RESULTS According to emerging evidence, acetylshikonin exerts a wide spectrum of pharmacological effects such as anticancer, anti-inflammatory, lipid-regulatory, antidiabetic, antibacterial, antifungal, antioxidative, neuroprotective, and antiviral properties. However, only a few studies have reported the adverse effects of acetylshikonin, with respect to reproductive toxicity and genotoxicity. Pharmacokinetic studies demonstrate that acetylshikonin is associated with a wide distribution and poor absorption. CONCLUSIONS Although experimental data supports the beneficial effects of this compound, acetylshikonin cannot be considered as a therapy drug without further investigations, especially, on the toxicity and pharmacokinetics.
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Affiliation(s)
- Zhiqin Zhang
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Jie Bai
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Yawen Zeng
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Mengru Cai
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Yu Yao
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Huimin Wu
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Longtai You
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Xiaoxv Dong
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Jian Ni
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
- Beijing Research Institute of Chinese Medicine, Beijing University of Chinese Medicine, Beijing, China
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7
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Bromelain Confers Protection against the Non-Alcoholic Fatty Liver Disease in Male C57bl/6 Mice. Nutrients 2020; 12:nu12051458. [PMID: 32443556 PMCID: PMC7285019 DOI: 10.3390/nu12051458] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/14/2020] [Accepted: 05/14/2020] [Indexed: 12/18/2022] Open
Abstract
We aimed to investigate the effect of bromelain, the extract from stems of pineapples on the high-fat diet (HFD)-induced deregulation of hepatic lipid metabolism and non-alcoholic fatty liver disease (NAFLD), and its underlying mechanism in mice. Mice were daily administrated with HFD with or without bromelain (20 mg/kg) for 12 weeks, and we found that bromelain decreased the HFD-induced increase in body weight by ~30%, organ weight by ~20% in liver weight and ~40% in white adipose tissue weight. Additionally, bromelain attenuated HFD-induced hyperlipidemia by decreasing the serum level of total cholesterol by ~15% and triglycerides level by ~25% in mice. Moreover, hepatic lipid accumulation, particularly that of total cholesterol, free cholesterol, triglycerides, fatty acids, and glycerol, was decreased by 15–30% with bromelain treatment. Mechanistically, these beneficial effects of bromelain on HFD-induced hyperlipidemia and hepatic lipid accumulation may be attributed to the decreased fatty acid uptake and cholesteryl ester synthesis and the increased lipoprotein internalization, bile acid metabolism, cholesterol clearance, the assembly and secretion of very low-density lipoprotein, and the β-oxidation of fatty acids by regulating the protein expression involved in the above mentioned hepatic metabolic pathways. Collectively, these findings suggest that bromelain has therapeutic value for treating NAFLD and metabolic diseases.
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Qian H, Zhao X, Yan R, Yao X, Gao S, Sun X, Du X, Yang H, Wong CCL, Yan N. Structural basis for catalysis and substrate specificity of human ACAT1. Nature 2020; 581:333-338. [DOI: 10.1038/s41586-020-2290-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 03/17/2020] [Indexed: 02/03/2023]
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9
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Elgawish RA, El-Beltagy MA, El-Sayed RM, Gaber AA, Abdelrazek HMA. Protective role of lycopene against metabolic disorders induced by chronic bisphenol A exposure in rats. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:9192-9201. [PMID: 31916151 DOI: 10.1007/s11356-019-07509-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Accepted: 12/22/2019] [Indexed: 06/10/2023]
Abstract
This study was conducted to elucidate the ameliorative potential of lycopene (LYC) against the metabolic toxicity induced by bisphenol A (BPA) in rats. Male rats (n = 28) were divided into 4 equal groups: control group, LYC group was given lycopene (10 mg/kg BW), BPA group was given 10 mg/kg BW of BPA, and the last group was administered BPA and LYC at 10 mg/kg via gavage for 90 consecutive days. Body weight (BW) gain, lipid profile, and total antioxidant capacity (TAC) were assessed. Oral glucose tolerance test (OGTT), homeostasis model assessment-estimated insulin resistance (HOMA-IR), thyroid hormones, interleukin-1 beta (IL-1β), leptin, and resistin were assayed. Moreover, immunohistochemistry of TNF-α was performed in adipose tissue. BPA-treated rats showed significant reduction in BW gain and deteriorations in lipid profile, TAC, OGTT, and thyroid hormones as well as significant increases in HOMA-IR, IL-1β, leptin, and resistin. While, improvement of metabolic parameters was observed when LYC was administrated with BPA. Intense TNF-α immunostaining was detected in the fat of BPA-treated rats but the intensity decreased when LYC was administrated with BPA. In conclusion, LYC ameliorated the adverse effects of BPA on metabolism through its antioxidant potential and its reduction of TNF-α expression in adipose tissue.
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Affiliation(s)
- Rania Abdelrahman Elgawish
- Department of Forensic Medicine and Toxicology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt
| | - Marwa A El-Beltagy
- Department of Biochemistry, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt
| | - Rehab M El-Sayed
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Sinai University, El-, Arish, Egypt
| | - Aya A Gaber
- Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt
| | - Heba M A Abdelrazek
- Department of Physiology, Faculty of Veterinary Medicine, Suez Canal University, Ismailia, Egypt.
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Alamgeer, Asif H, Sandhu MZA, Aziz M, Irfan HM, Moreno KGT, Junior AG. Ameliorative Effects and Cellular Aspects of Phytoconstituents in Atherosclerosis. Curr Pharm Des 2020; 26:2574-2582. [PMID: 32056518 DOI: 10.2174/1381612826666200214161139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2019] [Accepted: 01/17/2020] [Indexed: 11/22/2022]
Abstract
Atherosclerosis is a cardiovascular disease that involves vessels through the development of fatty streaks and plaques. Plant-based compounds can help treat or prevent atherosclerosis by affecting various factors that are involved in the disease. The present review discusses our current knowledge of the major cellular and molecular mechanisms of phytotherapeutics for the treatment of atherosclerosis. Numerous studies have evaluated the antiatherosclerotic activity of phytoconstituents to provide preliminary evidence of efficacy, but only a few studies have delineated the underlying molecular mechanisms. Plant-derived phytotherapeutics primarily targets abnormal levels of lipoproteins, endothelial dysfunction, smooth muscle cell migration, foam cell development, and atheromatous plaque formation. Nonetheless, the principal mechanisms that are responsible for their therapeutic actions remain unclear. Further pharmacological studies are needed to elucidate the underlying molecular mechanisms of the antiatherosclerotic response to these phytoconstituents.
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Affiliation(s)
- Alamgeer
- Punjab University College of Pharmacy, University of the Punjab, Lahore, Pakistan
| | - Hira Asif
- Punjab University College of Pharmacy, University of the Punjab, Lahore, Pakistan,Department of Pharmacy, University of Lahore, Gujrat Campus, Gujrat, Pakistan
| | - Muhammad Z A Sandhu
- Punjab University College of Pharmacy, University of the Punjab, Lahore, Pakistan
| | - Madiha Aziz
- Punjab University College of Pharmacy, University of the Punjab, Lahore, Pakistan
| | - Hafiz M Irfan
- Punjab University College of Pharmacy, University of the Punjab, Lahore, Pakistan
| | - Karyne G T Moreno
- Laboratory of Cardiovascular Research and Integrative Pharmacology, College of Pharmacy, University of Sargodha, Sargodha, Pakistan
| | - Arquimedes Gasparotto Junior
- Laboratory of Electrophysiology and Cardiovascular Pharmacology, Faculty of Health Sciences, Federal University of Grande Dourados, Dourados, MS, Brazil
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Lopez AM, Chuang JC, Turley SD. Impact of loss of SOAT2 function on disease progression in the lysosomal acid lipase-deficient mouse. Steroids 2018; 130:7-14. [PMID: 29246491 PMCID: PMC5760480 DOI: 10.1016/j.steroids.2017.11.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/2017] [Revised: 11/28/2017] [Accepted: 11/30/2017] [Indexed: 01/27/2023]
Abstract
Although only a small proportion of cholesterol in the body is esterified, in several diseases marked expansion of the esterified cholesterol (EC) pool occurs. These include Wolman disease (WD) and Cholesteryl Ester Storage Disease (CESD) which both result from mutations in LIPA, the gene that encodes lysosomal acid lipase (LAL). The respective contributions that our three cholesterol esterifying enzymes make to EC production, especially in disorders like CESD, are not well defined. The current studies represent a detailed exploration of our earlier findings in young male LAL-deficient mice also missing sterol O-acyltransferase 2 (SOAT2, also called ACAT2). Here we show that, even as they aged, male and female Lal-/-: Soat2- /- mice, compared to Lal-/-: Soat2+/+ littermates, had appreciably less hepatomegaly as well as a marked reduction in the level of sequestration of EC, in liver transaminase activities, and in hepatic mRNA expression levels for markers of inflammation. Loss of SOAT2 function also dramatically curtailed EC entrapment in the small intestine of the LAL-deficient mice. Together, these data imply that SOAT2 inhibition, if applied concurrently with enzyme replacement therapy for LAL deficiency, may blunt the re-esterification of newly released unesterified cholesterol thereby improving clinical outcomes.
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Affiliation(s)
- Adam M Lopez
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, United States.
| | - Jen-Chieh Chuang
- Children's Research Institute, University of Texas Southwestern Medical Center, Dallas, TX 75390, United States.
| | - Stephen D Turley
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, United States.
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Guo D, Lu M, Hu X, Xu J, Hu G, Zhu M, Zhang X, Li Q, Chang CCY, Chang T, Song B, Xiong Y, Li B. Low-level expression of human ACAT2 gene in monocytic cells is regulated by the C/EBP transcription factors. Acta Biochim Biophys Sin (Shanghai) 2016; 48:980-989. [PMID: 27688151 PMCID: PMC5091289 DOI: 10.1093/abbs/gmw091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2016] [Revised: 08/18/2016] [Accepted: 07/15/2016] [Indexed: 01/15/2023] Open
Abstract
Acyl-coenzyme A:cholesterol acyltransferases (ACATs) are the exclusive intracellular enzymes that catalyze the formation of cholesteryl/steryl esters (CE/SE). In our previous work, we found that the high-level expression of human ACAT2 gene with the CpG hypomethylation of its whole promoter was synergistically regulated by two transcription factors Cdx2 and HNF1α in the intestine and fetal liver. Here, we first observed that the specific CpG-hypomethylated promoter was correlated with the low expression of human ACAT2 gene in monocytic cell line THP-1. Then, two CCAAT/enhancer binding protein (C/EBP) elements within the activation domain in the specific CpG-hypomethylation promoter region were identified, and the expression of ACAT2 in THP-1 cells was evidently decreased when the C/EBP transcription factors were knock-downed using RNAi technology. Furthermore, ChIP assay confirmed that C/EBPs directly bind to their elements for low-level expression of human ACAT2 gene in THP-1 cells. Significantly, the increased expressions of ACAT2 and C/EBPs were also found in macrophages differentiated from both ATRA-treated THP-1 cells and cultured human blood monocytes. These results demonstrate that the low-level expression of human ACAT2 gene with specific CpG-hypomethylated promoter is regulated by the C/EBP transcription factors in monocytic cells, and imply that the lowly expressed ACAT2 catalyzes the synthesis of certain CE/SE that are assembled into lipoproteins for the secretion.
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Affiliation(s)
- Dongqing Guo
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Ming Lu
- Department of General Surgery, Huashan Hospital, Fudan University, Shanghai 200040, China
| | - Xihan Hu
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Jiajia Xu
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Guangjing Hu
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Ming Zhu
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Xiaowei Zhang
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Qin Li
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Catherine C Y Chang
- Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
| | - Tayuan Chang
- Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
| | - Baoliang Song
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
- College of Life Sciences, The Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
| | - Ying Xiong
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Boliang Li
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
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Vera-Lastra O, Méndez-Flores S, Cruz-Dominguez MP, Medina G, Calderón-Aranda E, Jara LJ. Effect of ezetimibe plus pravastatin on endothelial dysfunction in patients with systemic lupus erythematosus. Lupus 2016; 25:741-8. [PMID: 26923285 DOI: 10.1177/0961203316631631] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 12/21/2015] [Indexed: 11/15/2022]
Abstract
BACKGROUND Patients with systemic lupus erythematosus (SLE) have a higher risk for cardiovascular disease (CVD), not fully explained by the conventional risk factors. These patients have endothelial dysfunction (ED) as an early process of atherosclerosis, which can be reversed with therapy. OBJECTIVE To determine the effect of ezetimibe plus pravastatin on endothelial function in patients with SLE after 12 months of treatment. PATIENTS AND METHODS An open study, before and after, which assessed the effect of ezetimibe plus pravastatin treatment, was performed. Twenty two patients (21 women and one man) with diagnosis of SLE were studied, with a mean age 40 ± 5 years. Endothelial dysfunction was evaluated using vascular ultrasound of the brachial artery in order to measure the flow-mediated vasodilation (FMV) basal and after 12 months of treatment with pravastatin 40 mg/day plus ezetimibe 10 mg/day. In addition, a lipid profile: total cholesterol (TC), HDL-cholesterol (HDL-C), LDL-cholesterol (LDL-C), and serum C-reactive protein (CRP), was done. RESULTS We found a basal FMV of 7.58% and 18.22% after 12 months of treatment, with an improvement of 10.64 points 95% CI (7.58-13.58), p < 0.001. TC decreased from 201.3 ± 58.9 mg/dL to 158.06 ± 50.13 mg/dL (p < 0.01); LDL-C from 125.78 ± 44.4 mg/dL to 78.8 ± 32.9 mg/dL (p < 0.001); HDL-C increased from 49.0 ± 16.8 mg/dL to 52.2 ± 13.8 mg/dL (p = 0.077). The basal and final concentrations of CRP were 4.49 and 2.8, respectively, with a mean decrease of 2.11 mg/dL, 95% CI (0.908-3.32), p < 0.002. Both drugs were well tolerated. CONCLUSION Ezetimibe plus pravastatin significantly improved FMV in patients with SLE, decreasing ED and the lipid profile. This treatment ameliorated an early process of atherosclerosis and a risk factor for CVD.
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Affiliation(s)
- O Vera-Lastra
- Internal Medicine Department, Hospital de Especialidades "Dr Antonio Fraga Mouret", Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social, Mexico City, Mexico Postgraduate Studies Division, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - S Méndez-Flores
- Internal Medicine Department, Hospital de Especialidades "Dr Antonio Fraga Mouret", Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social, Mexico City, Mexico Postgraduate Studies Division, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - M P Cruz-Dominguez
- Internal Medicine Department, Hospital de Especialidades "Dr Antonio Fraga Mouret", Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social, Mexico City, Mexico Postgraduate Studies Division, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - G Medina
- Clinical Research Unit, Hospital de Especialidades "Dr Antonio Fraga Mouret", Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social, Mexico City, Mexico Postgraduate Studies Division, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
| | - E Calderón-Aranda
- Cardiology Department, Hospital de Especialidades "Dr Antonio Fraga Mouret", Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social, Mexico City, Mexico
| | - L J Jara
- Direction of Education and Research, Hospital de Especialidades "Dr Antonio Fraga Mouret", Centro Médico Nacional La Raza, Instituto Mexicano del Seguro Social, Mexico City, Mexico Postgraduate Studies Division, Facultad de Medicina, Universidad Nacional Autónoma de México, Mexico City, Mexico
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Zhu M, Zhao X, Chen J, Xu J, Hu G, Guo D, Li Q, Zhang X, Chang CCY, Song B, Xiong Y, Chang T, Li B. ACAT1 regulates the dynamics of free cholesterols in plasma membrane which leads to the APP-α-processing alteration. Acta Biochim Biophys Sin (Shanghai) 2015; 47:951-9. [PMID: 26474739 DOI: 10.1093/abbs/gmv101] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2015] [Accepted: 07/14/2015] [Indexed: 12/13/2022] Open
Abstract
Acyl-CoA:cholesterol acyltransferase 1 (ACAT1) is a key enzyme exclusively using free cholesterols as the substrates in cell and is involved in the cellular cholesterol homeostasis. In this study, we used human neuroblastoma cell line SK-N-SH as a model and first observed that inhibiting ACAT1 can decrease the amyloid precursor protein (APP)-α-processing. Meanwhile, the transfection experiments using the small interfering RNA and expression plasmid of ACAT1 indicated that ACAT1 can dependently affect the APP-α-processing. Furthermore, inhibiting ACAT1 was found to increase the free cholesterols in plasma membrane (PM-FC), and the increased PM-FC caused by inhibiting ACAT1 can lead to the decrease of the APP-α-processing, indicating that ACAT1 regulates the dynamics of PM-FC, which leads to the alteration of the APP-α-processing. More importantly, further results showed that under the ACAT1 inhibition, the alterations of the PM-FC and the subsequent APP-α-processing are not dependent on the cellular total cholesterol level, confirming that ACAT1 regulates the dynamics of PM-FC. Finally, we revealed that even when the Niemann-Pick-Type C-dependent pathway is blocked, the ACAT1 inhibition still obviously results in the PM-FC increase, suggesting that the ACAT1-dependent pathway is responsible for the shuttling of PM-FC to the intracellular pool. Our data provide a novel insight that ACAT1 which enzymatically regulates the dynamics of PM-FC may play important roles in the human neuronal cells.
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Affiliation(s)
- Ming Zhu
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Xiaonan Zhao
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Jia Chen
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Jiajia Xu
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Guangjing Hu
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Dongqing Guo
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Qin Li
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Xiaowei Zhang
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Catherine C Y Chang
- Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
| | - Baoliang Song
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China College of Life Sciences, The Institute for Advanced Studies, Wuhan University, Wuhan 430072, China
| | - Ying Xiong
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
| | - Tayuan Chang
- Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
| | - Boliang Li
- Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
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15
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Lopez AM, Chuang JC, Posey KS, Ohshiro T, Tomoda H, Rudel LL, Turley SD. PRD125, a potent and selective inhibitor of sterol O-acyltransferase 2 markedly reduces hepatic cholesteryl ester accumulation and improves liver function in lysosomal acid lipase-deficient mice. J Pharmacol Exp Ther 2015; 355:159-67. [PMID: 26283692 PMCID: PMC4613965 DOI: 10.1124/jpet.115.227207] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2015] [Accepted: 08/14/2015] [Indexed: 11/22/2022] Open
Abstract
In most organs, the bulk of cholesterol is unesterified, although nearly all possess a varying capability of esterifying cholesterol through the action of either sterol O-acyltransferase (SOAT) 1 or, in the case of hepatocytes and enterocytes, SOAT2. Esterified cholesterol (EC) carried in plasma lipoproteins is hydrolyzed by lysosomal acid lipase (LAL) when they are cleared from the circulation. Loss-of-function mutations in LIPA, the gene that encodes LAL, result in Wolman disease or cholesteryl ester storage disease (CESD). Hepatomegaly and a massive increase in tissue EC levels are hallmark features of both disorders. While these conditions can be corrected with enzyme replacement therapy, the question arose as to whether pharmacological inhibition of SOAT2 might reduce tissue EC accretion in CESD. When weaned at 21 days, Lal(-/-) mice, of either gender, had a whole liver cholesterol content that was 12- to 13-fold more than that of matching Lal(+/+) littermates (23 versus 1.8 mg, respectively). In Lal(-/-) males given the selective SOAT2 inhibitor PRD125 1,11-O-o-methylbenzylidene-7-O-p-cyanobenzoyl-1,7,11-trideacetylpyripyropene A in their diet (∼10 mg/day per kg body weight) from 21 to 53 days, whole liver cholesterol content was 48.6 versus 153.7 mg in untreated 53-day-old Lal(-/-) mice. This difference reflected a 59% reduction in hepatic EC concentration (mg/g), combined with a 28% fall in liver mass. The treated mice also showed a 63% reduction in plasma alanine aminotransferase activity, in parallel with decisive falls in hepatic mRNA expression levels for multiple proteins that reflect macrophage presence and inflammation. These data implicate SOAT2 as a potential target in CESD management.
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Affiliation(s)
- Adam M Lopez
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas (A.M.L., J-C.C., K.S.P., S.D.T.); Graduate School of Pharmaceutical Science, Kitasato University, Tokyo, Japan (T.O., H.T.); and Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina (T.O., L.L.R.)
| | - Jen-Chieh Chuang
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas (A.M.L., J-C.C., K.S.P., S.D.T.); Graduate School of Pharmaceutical Science, Kitasato University, Tokyo, Japan (T.O., H.T.); and Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina (T.O., L.L.R.)
| | - Kenneth S Posey
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas (A.M.L., J-C.C., K.S.P., S.D.T.); Graduate School of Pharmaceutical Science, Kitasato University, Tokyo, Japan (T.O., H.T.); and Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina (T.O., L.L.R.)
| | - Taichi Ohshiro
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas (A.M.L., J-C.C., K.S.P., S.D.T.); Graduate School of Pharmaceutical Science, Kitasato University, Tokyo, Japan (T.O., H.T.); and Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina (T.O., L.L.R.)
| | - Hiroshi Tomoda
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas (A.M.L., J-C.C., K.S.P., S.D.T.); Graduate School of Pharmaceutical Science, Kitasato University, Tokyo, Japan (T.O., H.T.); and Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina (T.O., L.L.R.)
| | - Lawrence L Rudel
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas (A.M.L., J-C.C., K.S.P., S.D.T.); Graduate School of Pharmaceutical Science, Kitasato University, Tokyo, Japan (T.O., H.T.); and Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina (T.O., L.L.R.)
| | - Stephen D Turley
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas (A.M.L., J-C.C., K.S.P., S.D.T.); Graduate School of Pharmaceutical Science, Kitasato University, Tokyo, Japan (T.O., H.T.); and Department of Pathology, Wake Forest University School of Medicine, Winston-Salem, North Carolina (T.O., L.L.R.)
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16
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Lopez AM, Posey KS, Turley SD. Deletion of sterol O-acyltransferase 2 (SOAT2) function in mice deficient in lysosomal acid lipase (LAL) dramatically reduces esterified cholesterol sequestration in the small intestine and liver. Biochem Biophys Res Commun 2014; 454:162-6. [PMID: 25450374 PMCID: PMC4312202 DOI: 10.1016/j.bbrc.2014.10.063] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Accepted: 10/13/2014] [Indexed: 11/21/2022]
Abstract
Sterol O-acyltransferase 2 (SOAT2), also known as ACAT2, is the major cholesterol esterifying enzyme in the liver and small intestine (SI). Esterified cholesterol (EC) carried in certain classes of plasma lipoproteins is hydrolyzed by lysosomal acid lipase (LAL) when they are cleared from the circulation. Loss-of-function mutations in LIPA, the gene that encodes LAL, result in Wolman disease (WD) or cholesteryl ester storage disease (CESD). Hepatomegaly and a massive increase in tissue EC levels are hallmark features of both disorders. While these conditions can be corrected with enzyme replacement therapy, the question arose as to what effect the loss of SOAT2 function might have on tissue EC sequestration in LAL-deficient mice. When weaned at 21 days, Lal(-)(/)(-):Soat2(+)(/)(+) mice had a whole liver cholesterol content (mg/organ) of 24.7 mg vs 1.9mg in Lal(+/+):Soat2(+/+) littermates, with almost all the excess sterol being esterified. Over the next 31 days, liver cholesterol content in the Lal(-)(/)(-):Soat2(+)(/)(+) mice increased to 145 ± 2 mg but to only 29 ± 2 mg in their Lal(-)(/)(-):Soat2(-)(/)(-) littermates. The level of EC accumulation in the SI of the Lal(-)(/)(-):Soat2(-)(/)(-) mice was also much less than in their Lal(-)(/)(-):Soat2(+)(/)(+) littermates. In addition, there was a >70% reduction in plasma transaminase activities in the Lal(-)(/)(-):Soat2(-)(/)(-) mice. These studies illustrate how the severity of disease in a mouse model for CESD can be substantially ameliorated by elimination of SOAT2 function.
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Affiliation(s)
- Adam M Lopez
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390-9151, United States.
| | - Kenneth S Posey
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390-9151, United States.
| | - Stephen D Turley
- Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390-9151, United States.
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17
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Multi-target drugs: the trend of drug research and development. PLoS One 2012; 7:e40262. [PMID: 22768266 PMCID: PMC3386979 DOI: 10.1371/journal.pone.0040262] [Citation(s) in RCA: 174] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2012] [Accepted: 06/04/2012] [Indexed: 11/22/2022] Open
Abstract
Summarizing the status of drugs in the market and examining the trend of drug research and development is important in drug discovery. In this study, we compared the drug targets and the market sales of the new molecular entities approved by the U.S. Food and Drug Administration from January 2000 to December 2009. Two networks, namely, the target–target and drug–drug networks, have been set up using the network analysis tools. The multi-target drugs have much more potential, as shown by the network visualization and the market trends. We discussed the possible reasons and proposed the rational strategies for drug research and development in the future.
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18
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McIntosh AL, Senthivinayagam S, Moon KC, Gupta S, Lwande JS, Murphy CC, Storey SM, Atshaves BP. Direct interaction of Plin2 with lipids on the surface of lipid droplets: a live cell FRET analysis. Am J Physiol Cell Physiol 2012; 303:C728-42. [PMID: 22744009 DOI: 10.1152/ajpcell.00448.2011] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Despite increasing awareness of the health risks associated with excess lipid storage in cells and tissues, knowledge of events governing lipid exchange at the surface of lipid droplets remains unclear. To address this issue, fluorescence resonance energy transfer (FRET) was performed to examine live cell interactions of Plin2 with lipids involved in maintaining lipid droplet structure and function. FRET efficiencies (E) between CFP-labeled Plin2 and fluorescently labeled phosphatidylcholine, sphingomyelin, stearic acid, and cholesterol were quantitated on a pixel-by-pixel basis to generate FRET image maps that specified areas with high E (>60%) in lipid droplets. The mean E and the distance R between the probes indicated a high yield of energy transfer and demonstrated molecular distances on the order of 44-57 Å, in keeping with direct molecular contact. In contrast, FRET between CFP-Plin2 and Nile red was not detected, indicating that the CFP-Plin2/Nile red interaction was beyond FRET proximity (>100 Å). An examination of the effect of Plin2 on cellular metabolism revealed that triacylglycerol, fatty acid, and cholesteryl ester content increased while diacylglycerol remained constant in CFP-Plin2-overexpressing cells. Total phospholipids also increased, reflecting increased phosphatidylcholine and sphingomyelin. Consistent with these results, expression levels of enzymes involved in triacylglycerol, cholesteryl ester, and phospholipid synthesis were significantly upregulated in CFP-Plin2-expressing cells while those associated with lipolysis either decreased or were unaffected. Taken together, these data show for the first time that Plin2 interacts directly with lipids on the surface of lipid droplets and influences levels of key enzymes and lipids involved in maintaining lipid droplet structure and function.
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Affiliation(s)
- Avery L McIntosh
- Dept. of Biochemistry and Molecular Biology, Michigan State Univ., East Lansing, MI 48824, USA
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19
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Holub BJ, Swidinsky P, Park E. Oral docosapentaenoic acid (22:5n-3) is differentially incorporated into phospholipid pools and differentially metabolized to eicosapentaenoic acid in tissues from young rats. Lipids 2011; 46:399-407. [PMID: 21380793 DOI: 10.1007/s11745-011-3535-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2010] [Accepted: 01/13/2011] [Indexed: 10/18/2022]
Abstract
The present study assessed the effect of oral supplementation with docosapentaenoic acid (DPA, 22:5n-3) on the levels of serum and tissue lipid classes and their fatty acid compositions including individual phospholipid types in rat liver, heart, and kidney. Sprague-Dawley rats received daily oral gavage over 10 days as corn oil without (controls) or with purified DPA in free fatty acid form (21.2 mg/day). The DPA group exhibited significantly lower serum lipid concentrations. The concentrations in μmol/100 g serum or μmol/g tissue of DPA in the total lipid (TL) were higher by 2.3-, 2.4-, 10.9-, and 5.1-fold in the DPA group of serum, liver, heart, and kidney, respectively, with the phospholipids (PL) being the major DPA reservoir (45.2-52.1% of the DPA in the TL). No significant differences in DHA (22:6n-3) amounts in TL appeared. The highest relative mol% values as DPA were in heart tissue (means of 11.1% in PL and 16.2% in phosphatidylinositol) and lowest in kidney. The EPA (20:5n-3) concentrations were markedly higher in the DPA group and most pronounced in the kidney (5.1 times higher in the TL as compared to controls) relative to liver and heart yielding an estimated apparent % conversion of DPA to EPA of 67% and EPA:DPA ratios reaching 5.74 in kidney phosphatidylethanolamine. The serum lipid-lowering potential of dietary DPA and its impact in the kidney with the derived EPA warrants investigation.
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Affiliation(s)
- Bruce J Holub
- Department of Human Biology and Nutritional Sciences, Animal Science and Nutrition Building, University of Guelph, Guelph, ON, N1G 2W1, Canada.
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20
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Plasma levels of 27-hydroxycholesterol in humans and mice with monogenic disturbances of high density lipoprotein metabolism. Atherosclerosis 2010; 214:448-55. [PMID: 21130455 DOI: 10.1016/j.atherosclerosis.2010.10.042] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/10/2010] [Revised: 10/15/2010] [Accepted: 10/19/2010] [Indexed: 01/29/2023]
Abstract
Secretion of 27-hydroxycholesterol (27OHC) from macrophages is considered as an alternative to HDL-mediated reverse transport of excess cholesterol. We investigated 27OHC-concentrations in plasma of humans and mice with monogenic disorders of HDL metabolism. As compared to family controls mutations in the genes for apolipoprotein A-I, ATP binding cassette transporter (ABC) A1 and lecithin:cholesterol acylstransferase (LCAT) were associated with reduced concentrations of both HDL-cholesterol and HDL-27OHC whereas mutations in the genes for cholesterylester transfer protein (CETP), scavenger receptor type BI and hepatic lipase were associated with elevated HDL concentrations of either sterol. Compared to family controls and relative to the concentrations of total 27OHC and cholesterol, lower 27OHC-ester but normal cholesterylester levels were found in HDL of heterozygous LCAT mutation carriers and nonHDL of heterozygous CETP mutation carriers. In family controls, LCAT activity and CETP mass were more strongly correlated with 27OHC-ester than cholesterylester concentrations in HDL and nonHDL, respectively. These findings suggest that the formation and transfer of 27OHC-esters are more sensitive to reduced activities of LCAT and CETP, respectively, than the formation and transfer of cholesterylesters. 27OHC plasma levels were also decreased in apoA-I-, ABCA1- or LCAT-knockout mice but increased in SR-BI-knockout mice. Transplantation of ABCA1- and/or ABCG1-deficient bone marrow into LDL receptor deficient mice decreased plasma levels of 27OHC. In conclusion, mutations or absence of HDL genes lead to distinct alterations in the quantity, esterification or lipoprotein distribution of 27OHC. These findings argue against the earlier suggestion that 27OHC-metabolism in plasma occurs independently of HDL.
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Fox BM, Iio K, Li K, Choi R, Inaba T, Jackson S, Sagawa S, Shan B, Tanaka M, Yoshida A, Kayser F. Discovery of pyrrolopyridazines as novel DGAT1 inhibitors. Bioorg Med Chem Lett 2010; 20:6030-3. [DOI: 10.1016/j.bmcl.2010.08.066] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2010] [Revised: 08/12/2010] [Accepted: 08/12/2010] [Indexed: 11/27/2022]
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Ohta M, Takahashi K, Kasai M, Shoji Y, Kunishiro K, Miike T, Kanda M, Mukai C, Shirahase H. Novel Tetrahydroisoquinoline Derivatives with Inhibitory Activities against Acyl-CoA: Cholesterol Acyltransferase and Lipid Peroxidation. Chem Pharm Bull (Tokyo) 2010; 58:1066-76. [DOI: 10.1248/cpb.58.1066] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Masaru Ohta
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd
- Division of Pharmaceutical Sciences, Graduate School of Natural Science and Technology, Kanazawa University
| | | | - Masayasu Kasai
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd
| | | | | | - Tomohiro Miike
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd
| | - Mamoru Kanda
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd
| | - Chisato Mukai
- Division of Pharmaceutical Sciences, Graduate School of Natural Science and Technology, Kanazawa University
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Takahashi K, Ohta M, Shoji Y, Kasai M, Kunishiro K, Miike T, Kanda M, Shirahase H. Novel Acyl-CoA: Cholesterol Acyltransferase Inhibitor: Indoline-Based Sulfamide Derivatives with Low Lipophilicity and Protein Binding Ratio. Chem Pharm Bull (Tokyo) 2010; 58:1057-65. [DOI: 10.1248/cpb.58.1057] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
| | - Masaru Ohta
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd
| | | | - Masayasu Kasai
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd
| | | | - Tomohiro Miike
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd
| | - Mamoru Kanda
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd
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Matsuda D, Ohshiro T, Ohba M, Jiang W, Hong B, Si S, Tomoda H. The molecular target of rubimaillin in the inhibition of lipid droplet accumulation in macrophages. Biol Pharm Bull 2009; 32:1317-20. [PMID: 19652367 DOI: 10.1248/bpb.32.1317] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
The naphthohydroquinone rubimaillin, which has an angular-type three cyclic skeleton and was isolated from the Chinese medical plant Rubia cordifola, was found to inhibit lipid droplet accumulation in mouse macrophages and to selectively inhibit cholesteryl ester synthesis (IC(50): 18 microM). The metabolism of cholesterol from lysosomes to lipid droplets was inhibited by the compound with a similar IC(50) (45 microM). Moreover, rubimaillin inhibited acyl-CoA:cholesterol acyltransferase (ACAT1) activity in ACAT1-expressing cells (IC(50): 80 microM). Thus, these data strongly suggest that rubimaillin inhibits macrophage ACAT activity in order to decrease cholesteryl ester (CE) synthesis, leading to a reduction in the number of lipid droplets. Furthermore, rubimaillin was found to inhibit the ACAT2 isozyme in ACAT2-expressing cells (IC(50): 22 microM). We concluded that rubimaillin is a dual inhibitor of ACAT1 and ACAT2, but is more selective for the ACAT2 isozyme.
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Affiliation(s)
- Daisuke Matsuda
- Graduate School of Pharmaceutical Sciences, Kitasato University, Tokyo, Japan
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25
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Abstract
The enzymes acyl-coenzyme A (CoA):cholesterol acyltransferases (ACATs) are membrane-bound proteins that utilize long-chain fatty acyl-CoA and cholesterol as substrates to form cholesteryl esters. In mammals, two isoenzymes, ACAT1 and ACAT2, encoded by two different genes, exist. ACATs play important roles in cellular cholesterol homeostasis in various tissues. This chapter summarizes the current knowledge on ACAT-related research in two areas: 1) ACAT genes and proteins and 2) ACAT enzymes as drug targets for atherosclerosis and for Alzheimer's disease.
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Affiliation(s)
- Ta-Yuan Chang
- Department of Biochemistry, Dartmouth Medical School, 1 Rope Ferry Rd., Hanover, NH 03755-1404, USA.
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26
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Shoji Y, Takahashi K, Ohta M, Kasai M, Kunishiro K, Kanda M, Yogai S, Takeuchi Y, Shirahase H. Novel indoline-based acyl-CoA: cholesterol acyltransferase inhibitor: Effects of introducing a methanesulfonamide group on physicochemical properties and biological activities. Bioorg Med Chem 2009; 17:6020-31. [PMID: 19608421 DOI: 10.1016/j.bmc.2009.06.047] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2009] [Revised: 06/21/2009] [Accepted: 06/23/2009] [Indexed: 11/26/2022]
Abstract
A novel series of indoline-based acyl-CoA: cholesterol acyltransferase (ACAT) inhibitors with a methanesulfonamide group at the 5-position were synthesized and their lipophilicity and biological activities were evaluated. Hepatic ACAT inhibitory and anti-foam cell formation activity increased dependent on lipophilicity of derivatives with various alkyl chains at the 1-position. The logD(7.0)-biological activity curve of the derivatives with a methanesulfonamide group shifted leftward compared to that of Pactimibe derivatives with a carboxymethyl group, and derivatives with no substituent, suggesting that a methanesulfonamide group plays an important role in the interaction with ACAT protein. Among derivatives, N-(1-ethyl-5-methanesulfonylamino-4,6-dimethylindolin-7-yl)-2,2-dimethylpropanamide (1b) had about twofold lower logD(7.0) than Pactimibe, while it showed twofold higher hepatic ACAT inhibition than and the same anti-foam cell formation as Pactimibe, respectively. The C(max) of 1b (10mg/kg, po) was higher than that of Pactimibe in rats. The plasma protein binding ratio of 1b was lower than that of Pactimibe: 64.8% and 97.9%, respectively. Compound 1b showed greater inhibitory effects on hepatic cholesterol secretion in mice than Pactimibe. In conclusion, the introduction of a methanesulfonamide group is effective to design less lipophilic, more efficacious and more bioavailable indoline-based ACAT inhibitors than previous indoline-based inhibitors.
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Affiliation(s)
- Yoshimichi Shoji
- Research Laboratories, Kyoto Pharmaceutical Industries, Nishinokyo Tsukinowa-cho, Nakagyo-ku, Japan
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RNA secondary structures located in the interchromosomal region of human ACAT1 chimeric mRNA are required to produce the 56-kDa isoform. Cell Res 2009; 18:921-36. [PMID: 18542101 DOI: 10.1038/cr.2008.66] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
We have previously reported that the human ACAT1 gene produces a chimeric mRNA through the interchromosomal processing of two discontinuous RNAs transcribed from chromosomes 1 and 7. The chimeric mRNA uses AUG(1397-1399) and GGC(1274-1276) as translation initiation codons to produce normal 50-kDa ACAT1 and a novel enzymatically active 56-kDa isoform, respectively, with the latter being authentically present in human cells, including human monocyte-derived macrophages. In this work, we report that RNA secondary structures located in the vicinity of the GGC(1274-1276) codon are required for production of the 56-kDa isoform. The effects of the three predicted stem-loops (nt 1255-1268, 1286-1342 and 1355-1384) were tested individually by transfecting expression plasmids into cells that contained the wild-type, deleted or mutant stem-loop sequences linked to a partial ACAT1 AUG open reading frame (ORF) or to the ORFs of other genes. The expression patterns were monitored by western blot analyses. We found that the upstream stem-loop(1255-1268) from chromosome 7 and downstream stem-loop(1286-1342) from chromosome 1 were needed for production of the 56-kDa isoform, whereas the last stem-loop(1355-1384) from Chromosome 1 was dispensable. The results of experiments using both monocistronic and bicistronic vectors with a stable hairpin showed that translation initiation from the GGC(1274-1276) codon was mediated by an internal ribosome entry site (IRES). Further experiments revealed that translation initiation from the GGC(1274-1276) codon requires the upstream AU-constituted RNA secondary structure and the downstream GC-rich structure. This mechanistic work provides further support for the biological significance of the chimeric nature of the human ACAT1 transcript.
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Lei L, Xiong Y, Chen J, Yang JB, Wang Y, Yang XY, Chang CCY, Song BL, Chang TY, Li BL. TNF-alpha stimulates the ACAT1 expression in differentiating monocytes to promote the CE-laden cell formation. J Lipid Res 2009; 50:1057-67. [PMID: 19189937 DOI: 10.1194/jlr.m800484-jlr200] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
High levels of the inflammatory cytokine tumor necrosis factor-alpha (TNF-alpha) are present in atherosclerotic lesions. TNF-alpha regulates expression of multiple genes involved in various stages of atherosclerosis, and it exhibits proatherosclerotic and antiatherosclerotic properties. ACAT catalyzes the formation of cholesteryl esters (CE) in monocytes/macrophages, and it promotes the foam cell formation at the early stage of atherosclerosis. We hypothesize that TNF-alpha may be involved in regulating the ACAT gene expression in monocytes/macrophages. In this article, we show that in cultured, differentiating human monocytes, TNF-alpha enhances the expression of the ACAT1 but not ACAT2 gene, increases the cholesteryl ester accumulation, and promotes the lipid-laden cell formation. Several other proinflammatory cytokines tested do not affect the ACAT1 gene expression. The stimulation effect is consistent with a receptor-dependent process, and is blocked by using nuclear factor-kappa B (NF-kappa B) inhibitors. A functional and unique NF-kappa B element located within the human ACAT1 gene proximal promoter is required to mediate the action of TNF-alpha. Our data demonstrate that TNF-alpha, through the NF-kappa B pathway, specifically enhances the expression of human ACAT1 gene to promote the CE-laden cell formation from the differentiating monocytes, and our data support the hypothesis that TNF-alpha is proatherosclerotic during early phase of lesion development.
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Affiliation(s)
- Lei Lei
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China
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29
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Zhao X, Chen J, Lei L, Hu G, Xiong Y, Xu J, Li Q, Yang X, Chang CC, Song B, Chang T, Li B. The optional long 5'-untranslated region of human ACAT1 mRNAs impairs the production of ACAT1 protein by promoting its mRNA decay. Acta Biochim Biophys Sin (Shanghai) 2009; 41:30-41. [PMID: 19129948 DOI: 10.1093/abbs/gmn004] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We have previously reported that human ACAT1 mRNAs produce the 50 kDa protein using the AUG(11397-1399) initiation codon, and also a minor 56 kDa isoform using the upstream in-frame GGC(1274-1276) initiation codon. The GGC(1274-1276) codon is located at the optional long 5'-untranslated region (5'-UTR, nt 1-1396) of the mRNAs. The DNA sequences corresponding to this 5'-UTR are located in two different chromosomes, 7 and 1. In the current work, we report that the optional long 5'-UTR significantly impairs the production of human ACAT1 protein initiated from the AUG(1397-1399)codon, mainly by promoting its mRNA decay. The western blot analyses indicated that the optional long 5'-UTR potently impaired the production of different proteins initiated from the AUG(1397-1399) codon, meaning that this impairing effect was not influenced by the 3'-UTR or the coding sequence of ACAT1 mRNA. The results of reverse transcription-quantitative polymerase chain reaction demonstrated that this 5'- UTR dramatically reduced the contents of its linked mRNAs. Analyses of the protein to mRNA ratios showed that this 5'-UTR mainly decreased its mRNA stability rather than altering its translational efficiency. We next performed the plasmid transfection experiments and used actinomycin D to inhibit transcription. The results showed that this 5'-UTR promoted its mRNA decay. Additional transfection and nucleofection experiments using RNAs prepared in vitro illustrated that, in both the cytoplasm and the nucleus of cells, the optional long 5'-UTR-linked mRNAs decayed faster than those without the link. Overall, our study brings new insight to the regulation of the human ACAT1 gene expression at the post-transcription level.
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Affiliation(s)
- Xiaonan Zhao
- State Key Laboratory of Molecular Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
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Takahashi K, Kasai M, Ohta M, Shoji Y, Kunishiro K, Kanda M, Kurahashi K, Shirahase H. Novel Indoline-Based Acyl-CoA:Cholesterol Acyltransferase Inhibitor with Antiperoxidative Activity: Improvement of Physicochemical Properties and Biological Activities by Introduction of Carboxylic Acid. J Med Chem 2008; 51:4823-33. [DOI: 10.1021/jm800248r] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kenji Takahashi
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd., 38 Nishinokyo Tsukinowa-cho, Nakagyo-ku, Kyoto 604-8444, Japan, Radioisotope Research Center, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Masayasu Kasai
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd., 38 Nishinokyo Tsukinowa-cho, Nakagyo-ku, Kyoto 604-8444, Japan, Radioisotope Research Center, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Masaru Ohta
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd., 38 Nishinokyo Tsukinowa-cho, Nakagyo-ku, Kyoto 604-8444, Japan, Radioisotope Research Center, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Yoshimichi Shoji
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd., 38 Nishinokyo Tsukinowa-cho, Nakagyo-ku, Kyoto 604-8444, Japan, Radioisotope Research Center, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Kazuyoshi Kunishiro
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd., 38 Nishinokyo Tsukinowa-cho, Nakagyo-ku, Kyoto 604-8444, Japan, Radioisotope Research Center, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Mamoru Kanda
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd., 38 Nishinokyo Tsukinowa-cho, Nakagyo-ku, Kyoto 604-8444, Japan, Radioisotope Research Center, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Kazuyoshi Kurahashi
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd., 38 Nishinokyo Tsukinowa-cho, Nakagyo-ku, Kyoto 604-8444, Japan, Radioisotope Research Center, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hiroaki Shirahase
- Research Laboratories, Kyoto Pharmaceutical Industries, Ltd., 38 Nishinokyo Tsukinowa-cho, Nakagyo-ku, Kyoto 604-8444, Japan, Radioisotope Research Center, Kyoto University, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
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31
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Li F, Guo Y, Sun S, Jiang X, Tang B, Wang Q, Wang L. Free cholesterol-induced macrophage apoptosis is mediated by inositol-requiring enzyme 1 alpha-regulated activation of Jun N-terminal kinase. Acta Biochim Biophys Sin (Shanghai) 2008; 40:226-34. [PMID: 18330477 DOI: 10.1111/j.1745-7270.2008.00396.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
Macrophage death in advanced atherosclerotic lesions leads to lesional necrosis, possible plaque rupture, and acute vascular occlusion. A likely cause of macrophage death is the accumulation of free cholesterol (FC) leading to activation of endoplasmic reticulum (ER) stress-induced apoptosis. Inositol-requiring enzyme 1 alpha (IRE1alpha) is an integral membrane protein of the ER that is a key signaling step in cholesterol-induced apoptosis in macrophages, activated by stress in the ER. However, the role of IRE1alpha in the regulation of ER stress-induced macrophage death and the mechanism for this process are largely unclear. In this study, a cell culture model was used to explore the mechanisms involved in the ER stress pathway of FC-induced macrophage death. The results herein showed that FC loading of macrophages leads to an apoptotic response that is partially dependent on initiation by activation of IRE1alpha. Taken together, these results showed that the IRE1-apoptosis-signaling kinase 1-c-Jun NH2-terminal kinase cascade pathway was required in this process. Moreover, the data suggested a novel cellular mechanism for cholesterol-induced macrophage death in advanced atherosclerotic lesions. The critical function of this signaling cascade is indicated by prevention of ER stress-induced apoptosis after inhibition of IRE1alpha, or c-Jun NH2-terminal kinase.
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Affiliation(s)
- Fangming Li
- Department of Neurology, Union Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan 430022, China
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32
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Zhao G, Souers AJ, Voorbach M, Falls HD, Droz B, Brodjian S, Lau YY, Iyengar RR, Gao J, Judd AS, Wagaw SH, Ravn MM, Engstrom KM, Lynch JK, Mulhern MM, Freeman J, Dayton BD, Wang X, Grihalde N, Fry D, Beno DWA, Marsh KC, Su Z, Diaz GJ, Collins CA, Sham H, Reilly RM, Brune ME, Kym PR. Validation of diacyl glycerolacyltransferase I as a novel target for the treatment of obesity and dyslipidemia using a potent and selective small molecule inhibitor. J Med Chem 2008; 51:380-3. [PMID: 18183944 DOI: 10.1021/jm7013887] [Citation(s) in RCA: 113] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A highly potent and selective DGAT-1 inhibitor was identified and used in rodent models of obesity and postprandial chylomicron excursion to validate DGAT-1 inhibition as a novel approach for the treatment of metabolic diseases. Specifically, compound 4a conferred weight loss and a reduction in liver triglycerides when dosed chronically in DIO mice and depleted serum triglycerides following a lipid challenge in a dose-dependent manner, thus, reproducing major phenotypical characteristics of DGAT-1(-/-) mice.
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Affiliation(s)
- Gang Zhao
- Metabolic Disease Research, Abbott Laboratories, Abbott Park, IL 60064, USA
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Matsuda D, Ohte S, Ohshiro T, Jiang W, Rudel L, Hong B, Si S, Tomoda H. Molecular Target of Piperine in the Inhibition of Lipid Droplet Accumulation in Macrophages. Biol Pharm Bull 2008; 31:1063-6. [DOI: 10.1248/bpb.31.1063] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
| | - Satoshi Ohte
- Graduate School of Pharmacy, Kitasato University
| | | | - Wei Jiang
- National Key Laboratory for Screening of New Microbial Drugs, Institute of Medical Biotechnology, Chinese Academy of Medical Science
| | - Lawrence Rudel
- Department of Pathology, Arteriosclerosis Research Program, Wake Forest University School of Medicine
| | - Bin Hong
- National Key Laboratory for Screening of New Microbial Drugs, Institute of Medical Biotechnology, Chinese Academy of Medical Science
| | - Shuyi Si
- National Key Laboratory for Screening of New Microbial Drugs, Institute of Medical Biotechnology, Chinese Academy of Medical Science
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34
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Bellina F, Cauteruccio S, Rossi R. Synthesis and biological activity of vicinal diaryl-substituted 1H-imidazoles. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.02.075] [Citation(s) in RCA: 164] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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35
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Benfatti F, Cardillo G, Gentilucci L, Tolomelli A. Synthesis and biological evaluation of unprecedented classes of spiro-beta-lactams and azido-beta-lactams as acyl-CoA:cholesterol acyltransferase inhibitors. Bioorg Med Chem Lett 2007; 17:1946-50. [PMID: 17275297 DOI: 10.1016/j.bmcl.2007.01.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2006] [Revised: 01/08/2007] [Accepted: 01/09/2007] [Indexed: 11/19/2022]
Abstract
Unprecedented classes of four- and five-membered hydroxyl-spiro-beta-lactams and hydroxyl-azido-beta-lactams were prepared via regioselective ring opening of hydroxyl-epoxides. The potential of these particular beta-lactams as biologically active compounds has been confirmed by the results obtained in ACAT inhibition assays.
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Affiliation(s)
- Fides Benfatti
- Dipartimento di Chimica G. Ciamician, Università di Bologna, Via Selmi 2, 40126 Bologna, Italy
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