1
|
Deskeuvre M, Lan J, Messens J, Riant O, Feron O, Frédérick R. A novel approach to pH-Responsive targeted cancer Therapy: Inhibition of FaDu cancer cell proliferation with a pH low insertion Peptide-Conjugated DGAT1 inhibitor. Int J Pharm 2024; 657:124132. [PMID: 38641019 DOI: 10.1016/j.ijpharm.2024.124132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 04/14/2024] [Accepted: 04/15/2024] [Indexed: 04/21/2024]
Abstract
Targeting enzymes involved in lipid metabolism is increasingly recognized as a promising anticancer strategy. Efficient inhibition of diacylglycerol O-transferase 1 (DGAT1) can block fatty acid (FA) storage. This, in turn, triggers an increase in free polyunsaturated FA concentration, leading to peroxidation and ferroptosis. In this study, we report the development of a pH-sensitive peptide (pHLIP)-drug conjugate designed to selectively deliver DGAT1 inhibitors to cancer cells nested within the acidic microenvironment of tumors. We utilized two previously established pHLIP sequences for coupling with drugs. The study of DGAT1 conjugates in large unilamellar vesicles (LUVs) of different compositions did not reveal enhanced pH-dependent insertion compared to POPC LUVs. However, using in vitro 3D tumor spheroids, significant antiproliferative effects were observed upon exposure to pHLIP-T863 (DGAT1 inhibitor) conjugates, surpassing the inhibitory activity of T863 alone. In conclusion, our study provides the first evidence that pHLIP-based conjugates with DGAT1 inhibitors have the potential to specifically target the acidic compartment of tumors. Moreover, it sheds light on the limitations of LUV models in capturing the pH-dependency of such conjugates.
Collapse
Affiliation(s)
- Marine Deskeuvre
- Louvain Drug Research Institute (LDRI), Medicinal Chemistry Research Group (CMFA), Université Catholique de Louvain (UCLouvain), 73 Avenue Emmanuel Mounier, B-1200 Brussel, Belgium; Pole of Pharmacology and Therapeutics (FATH), Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain (UCLouvain), 57 Avenue Hippocrate B1.57.04, B-1200 Brussels, Belgium
| | - Junjie Lan
- Institute of Condensed Matter and Nanosciences, MOST Division, Place Louis Pasteur, Université Catholique de Louvain (UCLouvain), Louvain-la-Neuve B-1348, Belgium
| | - Joris Messens
- VIB-VUB Center for Structural Biology, Vlaams Instituut Voor Biotechnologie (VIB), 1050 Brussels, Belgium; Brussels Center for Redox Biology, 1050 Brussels, Belgium; Structural Biology Brussels, Vrije Universiteit Brussel (VUB), 1050 Brussels, Belgium
| | - Olivier Riant
- Institute of Condensed Matter and Nanosciences, MOST Division, Place Louis Pasteur, Université Catholique de Louvain (UCLouvain), Louvain-la-Neuve B-1348, Belgium
| | - Olivier Feron
- Pole of Pharmacology and Therapeutics (FATH), Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain (UCLouvain), 57 Avenue Hippocrate B1.57.04, B-1200 Brussels, Belgium; Walloon Excellence in Life Sciences and BIOtechnology (WELBIO) Department, WEL Research Institute, B-1300 Wavre, Belgium
| | - Raphaël Frédérick
- Louvain Drug Research Institute (LDRI), Medicinal Chemistry Research Group (CMFA), Université Catholique de Louvain (UCLouvain), 73 Avenue Emmanuel Mounier, B-1200 Brussel, Belgium.
| |
Collapse
|
2
|
Deng B, Kong W, Shen X, Han C, Zhao Z, Chen S, Zhou C, Bae-Jump V. The role of DGAT1 and DGAT2 in regulating tumor cell growth and their potential clinical implications. J Transl Med 2024; 22:290. [PMID: 38500157 PMCID: PMC10946154 DOI: 10.1186/s12967-024-05084-z] [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: 12/20/2023] [Accepted: 03/10/2024] [Indexed: 03/20/2024] Open
Abstract
Lipid metabolism is widely reprogrammed in tumor cells. Lipid droplet is a common organelle existing in most mammal cells, and its complex and dynamic functions in maintaining redox and metabolic balance, regulating endoplasmic reticulum stress, modulating chemoresistance, and providing essential biomolecules and ATP have been well established in tumor cells. The balance between lipid droplet formation and catabolism is critical to maintaining energy metabolism in tumor cells, while the process of energy metabolism affects various functions essential for tumor growth. The imbalance of synthesis and catabolism of fatty acids in tumor cells leads to the alteration of lipid droplet content in tumor cells. Diacylglycerol acyltransferase 1 and diacylglycerol acyltransferase 2, the enzymes that catalyze the final step of triglyceride synthesis, participate in the formation of lipid droplets in tumor cells and in the regulation of cell proliferation, migration and invasion, chemoresistance, and prognosis in tumor. Several diacylglycerol acyltransferase 1 and diacylglycerol acyltransferase 2 inhibitors have been developed over the past decade and have shown anti-tumor effects in preclinical tumor models and improvement of metabolism in clinical trials. In this review, we highlight key features of fatty acid metabolism and different paradigms of diacylglycerol acyltransferase 1 and diacylglycerol acyltransferase 2 activities on cell proliferation, migration, chemoresistance, and prognosis in tumor, with the hope that these scientific findings will have potential clinical implications.
Collapse
Affiliation(s)
- Boer Deng
- Department of Gynecologic Oncology, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, People's Republic of China
- Division of Gynecologic Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Weimin Kong
- Department of Gynecologic Oncology, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, People's Republic of China
- Division of Gynecologic Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Xiaochang Shen
- Department of Gynecologic Oncology, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, People's Republic of China
- Division of Gynecologic Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Chao Han
- Department of Gynecologic Oncology, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, People's Republic of China
| | - Ziyi Zhao
- Department of Gynecologic Oncology, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, People's Republic of China
- Division of Gynecologic Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Shuning Chen
- Department of Gynecologic Oncology, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing Maternal and Child Health Care Hospital, Beijing, People's Republic of China
- Division of Gynecologic Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Chunxiao Zhou
- Division of Gynecologic Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
| | - Victoria Bae-Jump
- Division of Gynecologic Oncology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA.
| |
Collapse
|
3
|
Hernandez-Corbacho M, Canals D. Drug Targeting of Acyltransferases in the Triacylglyceride and 1-O-AcylCeramide Biosynthetic Pathways. Mol Pharmacol 2024; 105:166-178. [PMID: 38164582 DOI: 10.1124/molpharm.123.000763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 11/09/2023] [Accepted: 11/20/2023] [Indexed: 01/03/2024] Open
Abstract
Acyltransferase enzymes (EC 2.3.) are a large group of enzymes that transfer acyl groups to a variety of substrates. This review focuses on fatty acyltransferases involved in the biosynthetic pathways of glycerolipids and sphingolipids and how these enzymes have been pharmacologically targeted in their biologic context. Glycerolipids and sphingolipids, commonly treated independently in their regulation and biologic functions, are put together to emphasize the parallelism in their metabolism and bioactive roles. Furthermore, a newly considered signaling molecule, 1-O-acylceramide, resulting from the acylation of ceramide by DGAT2 enzyme, is discussed. Finally, the implications of DGAT2 as a putative ceramide acyltransferase (CAT) enzyme, with a putative dual role in TAG and 1-O-acylceramide generation, are explored. SIGNIFICANCE STATEMENT: This manuscript reviews the current status of drug development in lipid acyltransferases. These are current targets in metabolic syndrome and other diseases, including cancer. A novel function for a member in this group of lipids has been recently reported in cancer cells. The responsible enzyme and biological implications of this added member are discussed.
Collapse
Affiliation(s)
| | - Daniel Canals
- Department of Medicine, Stony Brook University, Stony Brook, New York
| |
Collapse
|
4
|
Esler WP, Cohen DE. Pharmacologic inhibition of lipogenesis for the treatment of NAFLD. J Hepatol 2024; 80:362-377. [PMID: 37977245 PMCID: PMC10842769 DOI: 10.1016/j.jhep.2023.10.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 10/13/2023] [Accepted: 10/23/2023] [Indexed: 11/19/2023]
Abstract
The hepatic accumulation of excess triglycerides is a seminal event in the initiation and progression of non-alcoholic fatty liver disease (NAFLD). Hepatic steatosis occurs when the hepatic accrual of fatty acids from the plasma and de novo lipogenesis (DNL) is no longer balanced by rates of fatty acid oxidation and secretion of very low-density lipoprotein-triglycerides. Accumulating data indicate that increased rates of DNL are central to the development of hepatic steatosis in NAFLD. Whereas the main drivers in NAFLD are transcriptional, owing to both hyperinsulinemia and hyperglycaemia, the effectors of DNL are a series of well-characterised enzymes. Several have proven amenable to pharmacologic inhibition or oligonucleotide-mediated knockdown, with lead compounds showing liver fat-lowering efficacy in phase II clinical trials. In humans with NAFLD, percent reductions in liver fat have closely mirrored percent inhibition of DNL, thereby affirming the critical contributions of DNL to NAFLD pathogenesis. The safety profiles of these compounds have so far been encouraging. It is anticipated that inhibitors of DNL, when administered alone or in combination with other therapeutic agents, will become important agents in the management of human NAFLD.
Collapse
Affiliation(s)
- William P Esler
- Internal Medicine Research Unit, Pfizer Worldwide Research Development and Medical, Cambridge, MA 02139 United States.
| | - David E Cohen
- Division of Gastroenterology, Hepatology and Endoscopy, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115 United States.
| |
Collapse
|
5
|
Sui X, Wang K, Song K, Xu C, Song J, Lee CW, Liao M, Farese RV, Walther TC. Mechanism of action for small-molecule inhibitors of triacylglycerol synthesis. Nat Commun 2023; 14:3100. [PMID: 37248213 PMCID: PMC10227072 DOI: 10.1038/s41467-023-38934-3] [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: 11/08/2022] [Accepted: 05/23/2023] [Indexed: 05/31/2023] Open
Abstract
Inhibitors of triacylglycerol (TG) synthesis have been developed to treat metabolism-related diseases, but we know little about their mechanisms of action. Here, we report cryo-EM structures of the TG-synthesis enzyme acyl-CoA:diacylglycerol acyltransferase 1 (DGAT1), a membrane bound O-acyltransferase (MBOAT), in complex with two different inhibitors, T863 and DGAT1IN1. Each inhibitor binds DGAT1's fatty acyl-CoA substrate binding tunnel that opens to the cytoplasmic side of the ER. T863 blocks access to the tunnel entrance, whereas DGAT1IN1 extends further into the enzyme, with an amide group interacting with more deeply buried catalytic residues. A survey of DGAT1 inhibitors revealed that this amide group may serve as a common pharmacophore for inhibition of MBOATs. The inhibitors were minimally active against the related MBOAT acyl-CoA:cholesterol acyltransferase 1 (ACAT1), yet a single-residue mutation sensitized ACAT1 for inhibition. Collectively, our studies provide a structural foundation for developing DGAT1 and other MBOAT inhibitors.
Collapse
Affiliation(s)
- Xuewu Sui
- Department of Molecular Metabolism, Harvard T.H. Chan School of Public Health, Boston, MA, USA
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
- Department of Biochemistry and Biophysics, College of Agriculture and Life Sciences, Texas A&M University, College Station, TX, USA
| | - Kun Wang
- Department of Molecular Metabolism, Harvard T.H. Chan School of Public Health, Boston, MA, USA
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Kangkang Song
- Department of Biochemistry and Molecular Biotechnology, University of Massachusetts Chan Medical School, Worcester, MA, USA
- Cryo-EM Core Facility, University of Massachusetts Chan Medical School, Worcester, MA, USA
| | - Chen Xu
- Department of Biochemistry and Molecular Biotechnology, University of Massachusetts Chan Medical School, Worcester, MA, USA
- Cryo-EM Core Facility, University of Massachusetts Chan Medical School, Worcester, MA, USA
| | - Jiunn Song
- Department of Molecular Metabolism, Harvard T.H. Chan School of Public Health, Boston, MA, USA
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Chia-Wei Lee
- Department of Molecular Metabolism, Harvard T.H. Chan School of Public Health, Boston, MA, USA
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA
| | - Maofu Liao
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA.
- School of Life Sciences, Southern University of Science and Technology, Shenzhen, China.
| | - Robert V Farese
- Department of Molecular Metabolism, Harvard T.H. Chan School of Public Health, Boston, MA, USA.
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA.
- Broad Institute of MIT and Harvard, Cambridge, MA, USA.
- Cell Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
| | - Tobias C Walther
- Department of Molecular Metabolism, Harvard T.H. Chan School of Public Health, Boston, MA, USA.
- Department of Cell Biology, Harvard Medical School, Boston, MA, USA.
- Broad Institute of MIT and Harvard, Cambridge, MA, USA.
- Cell Biology Program, Sloan Kettering Institute, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
- Howard Hughes Medical Institute, Boston, MA, USA.
| |
Collapse
|
6
|
Farese RV, Walther TC. Glycerolipid Synthesis and Lipid Droplet Formation in the Endoplasmic Reticulum. Cold Spring Harb Perspect Biol 2023; 15:a041246. [PMID: 36096640 PMCID: PMC10153804 DOI: 10.1101/cshperspect.a041246] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
More than 60 years ago, Eugene Kennedy and coworkers elucidated the endoplasmic reticulum (ER)-based pathways of glycerolipid synthesis, including the synthesis of phospholipids and triacylglycerols (TGs). The reactions of the Kennedy pathway were identified by studying the conversion of lipid intermediates and the isolation of biochemical enzymatic activities, but the molecular basis for most of these reactions was unknown. With recent progress in the cell biology, biochemistry, and structural biology in this area, we have a much more mechanistic understanding of this pathway and its reactions. In this review, we provide an overview of molecular aspects of glycerolipid synthesis, focusing on recent insights into the synthesis of TGs. Further, we go beyond the Kennedy pathway to describe the mechanisms for storage of TG in cytosolic lipid droplets and discuss how overwhelming these pathways leads to ER stress and cellular toxicity, as seen in diseases linked to lipid overload and obesity.
Collapse
Affiliation(s)
- Robert V Farese
- Department of Molecular Metabolism, Harvard T. H. Chan School of Public Health, Boston, Massachusetts 02115, USA
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
- Broad Institute of Harvard and MIT, Cambridge, Massachusetts 02142, USA
- Center for Causes and Prevention of Cardiovascular Disease (CAP-CVD), Harvard T. H. Chan School of Public Health, Boston, Massachusetts 02115, USA
| | - Tobias C Walther
- Department of Molecular Metabolism, Harvard T. H. Chan School of Public Health, Boston, Massachusetts 02115, USA
- Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, USA
- Broad Institute of Harvard and MIT, Cambridge, Massachusetts 02142, USA
- Center for Causes and Prevention of Cardiovascular Disease (CAP-CVD), Harvard T. H. Chan School of Public Health, Boston, Massachusetts 02115, USA
- Howard Hughes Medical Institute Boston, Boston, Massachusetts 02115, USA
| |
Collapse
|
7
|
Dalle S, Abderrahmani A, Renard E. Pharmacological inhibitors of β-cell dysfunction and death as therapeutics for diabetes. Front Endocrinol (Lausanne) 2023; 14:1076343. [PMID: 37008937 PMCID: PMC10050720 DOI: 10.3389/fendo.2023.1076343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Accepted: 02/20/2023] [Indexed: 03/17/2023] Open
Abstract
More than 500 million adults suffer from diabetes worldwide, and this number is constantly increasing. Diabetes causes 5 million deaths per year and huge healthcare costs per year. β-cell death is the major cause of type 1 diabetes. β-cell secretory dysfunction plays a key role in the development of type 2 diabetes. A loss of β-cell mass due to apoptotic death has also been proposed as critical for the pathogenesis of type 2 diabetes. Death of β-cells is caused by multiple factors including pro-inflammatory cytokines, chronic hyperglycemia (glucotoxicity), certain fatty acids at high concentrations (lipotoxicity), reactive oxygen species, endoplasmic reticulum stress, and islet amyloid deposits. Unfortunately, none of the currently available antidiabetic drugs favor the maintenance of endogenous β-cell functional mass, indicating an unmet medical need. Here, we comprehensively review over the last ten years the investigation and identification of molecules of pharmacological interest for protecting β-cells against dysfunction and apoptotic death which could pave the way for the development of innovative therapies for diabetes.
Collapse
Affiliation(s)
- Stéphane Dalle
- Institut de Génomique Fonctionnelle, Université de Montpellier, Centre National de la Recherche Scientifique (CNRS), Institut National de la Santé et de la Recherche Médicale (INSERM), Montpellier, France
| | - Amar Abderrahmani
- Université Lille, Centre National de la Recherche Scientifique (CNRS), Centrale Lille, Polytechnique Hauts-de-France, UMR 8520, IEMN, Lille, France
| | - Eric Renard
- Institut de Génomique Fonctionnelle, Université de Montpellier, Centre National de la Recherche Scientifique (CNRS), Institut National de la Santé et de la Recherche Médicale (INSERM), Montpellier, France
- Laboratoire de Thérapie Cellulaire du Diabète, Centre Hospitalier Universitaire, Montpellier, France
- Département d’Endocrinologie, Diabètologie, Centre Hospitalier Universitaire, Montpellier, France
| |
Collapse
|
8
|
Li X, Liu Q, Pan Y, Chen S, Zhao Y, Hu Y. New insights into the role of dietary triglyceride absorption in obesity and metabolic diseases. Front Pharmacol 2023; 14:1097835. [PMID: 36817150 PMCID: PMC9932209 DOI: 10.3389/fphar.2023.1097835] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Accepted: 01/20/2023] [Indexed: 02/05/2023] Open
Abstract
The incidence of obesity and associated metabolic diseases is increasing globally, adversely affecting human health. Dietary fats, especially triglycerides, are an important source of energy for the body, and the intestine absorbs lipids through a series of orderly and complex steps. A long-term high-fat diet leads to intestinal dysfunction, inducing obesity and metabolic disorders. Therefore, regulating dietary triglycerides absorption is a promising therapeutic strategy. In this review, we will discuss diverse aspects of the dietary triglycerides hydrolysis, fatty acid uptake, triglycerides resynthesis, chylomicron assembly, trafficking, and secretion processes in intestinal epithelial cells, as well as potential targets in this process that may influence dietary fat-induced obesity and metabolic diseases. We also mention the possible shortcomings and deficiencies in modulating dietary lipid absorption targets to provide a better understanding of their administrability as drugs in obesity and related metabolic disorders.
Collapse
Affiliation(s)
- Xiaojing Li
- Key Laboratory of Liver and Kidney Diseases (Ministry of Education), Institute of Liver Diseases, Shanghai Key Laboratory of Traditional Chinese Clinical Medicine, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Qiaohong Liu
- Institute of Clinical Pharmacology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yuqing Pan
- Key Laboratory of Liver and Kidney Diseases (Ministry of Education), Institute of Liver Diseases, Shanghai Key Laboratory of Traditional Chinese Clinical Medicine, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Si Chen
- Key Laboratory of Liver and Kidney Diseases (Ministry of Education), Institute of Liver Diseases, Shanghai Key Laboratory of Traditional Chinese Clinical Medicine, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Yu Zhao
- Key Laboratory of Liver and Kidney Diseases (Ministry of Education), Institute of Liver Diseases, Shanghai Key Laboratory of Traditional Chinese Clinical Medicine, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China,*Correspondence: Yu Zhao, ; Yiyang Hu,
| | - Yiyang Hu
- Key Laboratory of Liver and Kidney Diseases (Ministry of Education), Institute of Liver Diseases, Shanghai Key Laboratory of Traditional Chinese Clinical Medicine, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China,Institute of Clinical Pharmacology, Shuguang Hospital Affiliated to Shanghai University of Traditional Chinese Medicine, Shanghai, China,*Correspondence: Yu Zhao, ; Yiyang Hu,
| |
Collapse
|
9
|
Carss KJ, Deaton AM, Del Rio-Espinola A, Diogo D, Fielden M, Kulkarni DA, Moggs J, Newham P, Nelson MR, Sistare FD, Ward LD, Yuan J. Using human genetics to improve safety assessment of therapeutics. Nat Rev Drug Discov 2023; 22:145-162. [PMID: 36261593 DOI: 10.1038/s41573-022-00561-w] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/02/2022] [Indexed: 02/07/2023]
Abstract
Human genetics research has discovered thousands of proteins associated with complex and rare diseases. Genome-wide association studies (GWAS) and studies of Mendelian disease have resulted in an increased understanding of the role of gene function and regulation in human conditions. Although the application of human genetics has been explored primarily as a method to identify potential drug targets and support their relevance to disease in humans, there is increasing interest in using genetic data to identify potential safety liabilities of modulating a given target. Human genetic variants can be used as a model to anticipate the effect of lifelong modulation of therapeutic targets and identify the potential risk for on-target adverse events. This approach is particularly useful for non-clinical safety evaluation of novel therapeutics that lack pharmacologically relevant animal models and can contribute to the intrinsic safety profile of a drug target. This Review illustrates applications of human genetics to safety studies during drug discovery and development, including assessing the potential for on- and off-target associated adverse events, carcinogenicity risk assessment, and guiding translational safety study designs and monitoring strategies. A summary of available human genetic resources and recommended best practices is provided. The challenges and future perspectives of translating human genetic information to identify risks for potential drug effects in preclinical and clinical development are discussed.
Collapse
Affiliation(s)
| | - Aimee M Deaton
- Amgen, Cambridge, MA, USA.,Alnylam Pharmaceuticals, Cambridge, MA, USA
| | - Alberto Del Rio-Espinola
- Novartis Institutes for BioMedical Research, Basel, Switzerland.,GentiBio Inc., Cambridge, MA, USA
| | | | - Mark Fielden
- Amgen, Thousand Oaks, MA, USA.,Kate Therapeutics, San Diego, CA, USA
| | | | - Jonathan Moggs
- Novartis Institutes for BioMedical Research, Basel, Switzerland
| | | | | | - Frank D Sistare
- Merck & Co., West Point, PA, USA.,315 Meadowmont Ln, Chapel Hill, NC, USA
| | - Lucas D Ward
- Amgen, Cambridge, MA, USA. .,Alnylam Pharmaceuticals, Cambridge, MA, USA.
| | - Jing Yuan
- Amgen, Cambridge, MA, USA.,Pfizer, Cambridge, MA, USA
| |
Collapse
|
10
|
Abstract
Inter-individual variability in drug response, be it efficacy or safety, is common and likely to become an increasing problem globally given the growing elderly population requiring treatment. Reasons for this inter-individual variability include genomic factors, an area of study called pharmacogenomics. With genotyping technologies now widely available and decreasing in cost, implementing pharmacogenomics into clinical practice - widely regarded as one of the initial steps in mainstreaming genomic medicine - is currently a focus in many countries worldwide. However, major challenges of implementation lie at the point of delivery into health-care systems, including the modification of current clinical pathways coupled with a massive knowledge gap in pharmacogenomics in the health-care workforce. Pharmacogenomics can also be used in a broader sense for drug discovery and development, with increasing evidence suggesting that genomically defined targets have an increased success rate during clinical development.
Collapse
|
11
|
Amin NB, Saxena AR, Somayaji V, Dullea R. Inhibition of Diacylglycerol Acyltransferase 2 Versus Diacylglycerol Acyltransferase 1: Potential Therapeutic Implications of Pharmacology. Clin Ther 2023; 45:55-70. [PMID: 36690550 DOI: 10.1016/j.clinthera.2022.12.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Revised: 12/01/2022] [Accepted: 12/15/2022] [Indexed: 01/22/2023]
Abstract
PURPOSE Hepatic steatosis due to altered lipid metabolism and accumulation of hepatic triglycerides is a hallmark of nonalcoholic fatty liver disease (NAFLD). Diacylglycerol acyltransferase (DGAT) enzymes, DGAT1 and DGAT2, catalyze the terminal reaction in triglyceride synthesis, making them attractive targets for pharmacologic intervention. There is a common misconception that these enzymes are related; however, despite their similar names, DGAT1 and DGAT2 differ significantly on multiple levels. As we look ahead to future clinical studies of DGAT2 inhibitors in patients with NAFLD and nonalcoholic steatohepatitis (NASH), we review key differences and include evidence to highlight and support DGAT2 inhibitor (DGAT2i) pharmacology. METHODS Three Phase I, randomized, double-blind, placebo-controlled trials assessed the safety, tolerability, and pharmacokinetic properties of the DGAT2i ervogastat (PF-06865571) in healthy adult participants (Single Dose Study to Assess the Safety, Tolerability and Pharmacokinetics of PF-06865571 [study C2541001] and Study to Assess the Safety, Tolerability, and Pharmacokinetics of Multiple Doses of PF-06865571 in Healthy, Including Overweight and Obese, Adult Subjects [study C2541002]) or participants with NAFLD (2-Week Study in People With Nonalcoholic Fatty Liver Disease [study C2541005]). Data from 2 Phase I, randomized, double-blind, placebo-controlled trials of the DGAT1i PF-04620110 in healthy participants (A Single Dose Study of PF-04620110 in Overweight and Obese, Otherwise Healthy Volunteers [study B0961001] and A Multiple Dose Study of PF-04620110 in Overweight and Obese, Otherwise Healthy Volunteers [study B0961002]) were included for comparison. Safety outcomes were the primary end point in all studies, except in study C2541005, in which safety was the secondary end point, with relative change from baseline in whole liver fat at day 15 assessed as the primary end point. Safety data were analyzed across studies by total daily dose of ervogastat (5, 15, 50, 100, 150, 500, 600, 1000, and 1500 mg) or PF-04620110 (0.3, 1, 3, 5, 7, 10, 14, and 21 mg), with placebo data pooled separately across ervogastat and PF-04620110 studies. FINDINGS Published data indicate that DGAT1 and DGAT2 differ in multiple dimensions, including gene family, subcellular localization, substrate preference, and specificity, with unrelated pharmacologic inhibition properties and differing safety profiles. Although initial nonclinical studies suggested a potentially attractive therapeutic profile with DGAT1 inhibition, genetic and pharmacologic data suggest otherwise, with common gastrointestinal adverse events, including nausea, vomiting, and diarrhea, limiting further clinical development. Conversely, DGAT2 inhibition, although initially not pursued as aggressively as a potential target for pharmacologic intervention, has consistent efficacy in nonclinical studies, with reduced triglyceride synthesis accompanied by reduced expression of genes essential for de novo lipogenesis. In addition, early clinical data indicate antisteatotic effects with DGAT2i ervogastat, in participants with NAFLD, accompanied by a well-tolerated safety profile. IMPLICATIONS Although pharmacologic DGAT1is are limited by an adverse safety profile, data support use of DGAT2i as an effective and well-tolerated therapeutic strategy for patients with NAFLD, NASH, and NASH with liver fibrosis. CLINICALTRIALS gov identifiers: NCT03092232, NCT03230383, NCT03513588, NCT00799006, and NCT00959426.
Collapse
Affiliation(s)
- Neeta B Amin
- Internal Medicine Research Unit, Pfizer Inc, Cambridge, Massachusetts
| | - Aditi R Saxena
- Internal Medicine Research Unit, Pfizer Inc, Cambridge, Massachusetts
| | - Veena Somayaji
- Early Clinical Development, Pfizer Inc, Cambridge, Massachusetts
| | - Robert Dullea
- Internal Medicine Research Unit, Pfizer Inc, Cambridge, Massachusetts.
| |
Collapse
|
12
|
Cheng D, Zinker BA, Luo Y, Shipkova P, De Oliveira CH, Krishna G, Brown EA, Boehm SL, Tirucherai GS, Gu H, Ma Z, Chu CH, Onorato JM, Kopcho LM, Ammar R, Smith J, Devasthale P, Lawrence RM, Stryker SA, Dierks EA, Azzara AV, Carayannopoulos L, Charles ED, Lentz KA, Gordon DA. MGAT2 inhibitor decreases liver fibrosis and inflammation in murine NASH models and reduces body weight in human adults with obesity. Cell Metab 2022; 34:1732-1748.e5. [PMID: 36323235 DOI: 10.1016/j.cmet.2022.10.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2022] [Revised: 06/14/2022] [Accepted: 10/12/2022] [Indexed: 11/07/2022]
Abstract
Monoacylglycerol acyltransferase 2 (MGAT2) is an important enzyme highly expressed in the human small intestine and liver for the regulation of triglyceride absorption and homeostasis. We report that treatment with BMS-963272, a potent and selective MGAT2 inhibitor, decreased inflammation and fibrosis in CDAHFD and STAM, two murine nonalcoholic steatohepatitis (NASH) models. In high-fat-diet-treated cynomolgus monkeys, in contrast to a selective diacylglycerol acyltransferase 1 (DGAT1) inhibitor, BMS-963272 did not cause diarrhea. In a Phase 1 multiple-dose trial of healthy human adults with obesity (NCT04116632), BMS-963272 was safe and well tolerated with no treatment discontinuations due to adverse events. Consistent with the findings in rodent models, BMS-963272 elevated plasma long-chain dicarboxylic acid, indicating robust pharmacodynamic biomarker modulation; increased gut hormones GLP-1 and PYY; and decreased body weight in human subjects. These data suggest MGAT2 inhibition is a promising therapeutic opportunity for NASH, a disease with high unmet medical needs.
Collapse
Affiliation(s)
- Dong Cheng
- Departments of Discovery Biology Cardiovascular and Fibrosis, Bristol Myers Squibb, Princeton, NJ 08543, USA.
| | - Bradley A Zinker
- Departments of Discovery Biology Cardiovascular and Fibrosis, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - Yi Luo
- Translational Medicine, Bristol Myers Squibb, Lawrenceville, NJ 08543, USA
| | - Petia Shipkova
- Pharmaceutical Candidate Optimization, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | | | - Gopal Krishna
- ICF Early Clinical Development, Bristol Myers Squibb, Summit, NJ 07901, USA
| | - Elizabeth A Brown
- Translational Bioinformatics, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - Stephanie L Boehm
- Departments of Discovery Biology Cardiovascular and Fibrosis, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | | | - Huidong Gu
- Translational Medicine, Bristol Myers Squibb, Lawrenceville, NJ 08543, USA
| | - Zhengping Ma
- Departments of Discovery Biology Cardiovascular and Fibrosis, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - Ching-Hsuen Chu
- Departments of Discovery Biology Cardiovascular and Fibrosis, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - Joelle M Onorato
- Pharmaceutical Candidate Optimization, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - Lisa M Kopcho
- Leads Discovery and Optimization, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - Ron Ammar
- Translational Bioinformatics, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - Julia Smith
- Departments of Discovery Biology Cardiovascular and Fibrosis, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - Pratik Devasthale
- Small Molecule Drug Discovery, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - R Michael Lawrence
- Small Molecule Drug Discovery, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - Steven A Stryker
- Pharmaceutical Candidate Optimization, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - Elizabeth A Dierks
- Pharmaceutical Candidate Optimization, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - Anthony V Azzara
- Departments of Discovery Biology Cardiovascular and Fibrosis, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | | | - Edgar D Charles
- Global Drug Development, Bristol Myers Squibb, Lawrenceville, NJ 08543, USA
| | - Kimberley A Lentz
- Pharmaceutical Candidate Optimization, Bristol Myers Squibb, Princeton, NJ 08543, USA
| | - David A Gordon
- Departments of Discovery Biology Cardiovascular and Fibrosis, Bristol Myers Squibb, Princeton, NJ 08543, USA
| |
Collapse
|
13
|
Chu L, Terasaki M, Mattsson CL, Teinturier R, Charbord J, Dirice E, Liu KC, Miskelly MG, Zhou Q, Wierup N, Kulkarni RN, Andersson O. In vivo drug discovery for increasing incretin-expressing cells identifies DYRK inhibitors that reinforce the enteroendocrine system. Cell Chem Biol 2022; 29:1368-1380.e5. [PMID: 35998625 PMCID: PMC9557248 DOI: 10.1016/j.chembiol.2022.08.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 02/27/2022] [Accepted: 07/27/2022] [Indexed: 02/02/2023]
Abstract
Analogs of the incretin hormones Gip and Glp-1 are used to treat type 2 diabetes and obesity. Findings in experimental models suggest that manipulating several hormones simultaneously may be more effective. To identify small molecules that increase the number of incretin-expressing cells, we established a high-throughput in vivo chemical screen by using the gip promoter to drive the expression of luciferase in zebrafish. All hits increased the numbers of neurogenin 3-expressing enteroendocrine progenitors, Gip-expressing K-cells, and Glp-1-expressing L-cells. One of the hits, a dual-specificity tyrosine phosphorylation-regulated kinase (DYRK) inhibitor, additionally decreased glucose levels in both larval and juvenile fish. Knock-down experiments indicated that nfatc4, a downstream mediator of DYRKs, regulates incretin+ cell number in zebrafish, and that Dyrk1b regulates Glp-1 expression in an enteroendocrine cell line. DYRK inhibition also increased the number of incretin-expressing cells in diabetic mice, suggesting a conserved reinforcement of the enteroendocrine system, with possible implications for diabetes.
Collapse
Affiliation(s)
- Lianhe Chu
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Michishige Terasaki
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Charlotte L Mattsson
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Romain Teinturier
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Jérémie Charbord
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Ercument Dirice
- Islet Cell and Regenerative Biology, Joslin Diabetes Center, Department of Medicine, Harvard Medical School, Boston, MA 02215, USA
| | - Ka-Cheuk Liu
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden
| | - Michael G Miskelly
- Department of Clinical Sciences, Lund University Diabetes Centre, Malmö 20502, Sweden
| | - Qiao Zhou
- Division of Regenerative Medicine & Ansary Stem Cell Institute, Department of Medicine, Weill Cornell Medicine, 1300 York Avenue, New York, NY 10065, USA
| | - Nils Wierup
- Department of Clinical Sciences, Lund University Diabetes Centre, Malmö 20502, Sweden
| | - Rohit N Kulkarni
- Islet Cell and Regenerative Biology, Joslin Diabetes Center, Department of Medicine, Harvard Medical School, Boston, MA 02215, USA; Harvard Stem Cell Institute, Boston, MA 02215, USA
| | - Olov Andersson
- Department of Cell and Molecular Biology, Karolinska Institutet, Stockholm, Sweden.
| |
Collapse
|
14
|
Chen G, Harwood JL, Lemieux MJ, Stone SJ, Weselake RJ. Acyl-CoA:diacylglycerol acyltransferase: Properties, physiological roles, metabolic engineering and intentional control. Prog Lipid Res 2022; 88:101181. [PMID: 35820474 DOI: 10.1016/j.plipres.2022.101181] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 05/31/2022] [Accepted: 07/04/2022] [Indexed: 12/15/2022]
Abstract
Acyl-CoA:diacylglycerol acyltransferase (DGAT, EC 2.3.1.20) catalyzes the last reaction in the acyl-CoA-dependent biosynthesis of triacylglycerol (TAG). DGAT activity resides mainly in membrane-bound DGAT1 and DGAT2 in eukaryotes and bifunctional wax ester synthase-diacylglycerol acyltransferase (WSD) in bacteria, which are all membrane-bound proteins but exhibit no sequence homology to each other. Recent studies also identified other DGAT enzymes such as the soluble DGAT3 and diacylglycerol acetyltransferase (EaDAcT), as well as enzymes with DGAT activities including defective in cuticular ridges (DCR) and steryl and phytyl ester synthases (PESs). This review comprehensively discusses research advances on DGATs in prokaryotes and eukaryotes with a focus on their biochemical properties, physiological roles, and biotechnological and therapeutic applications. The review begins with a discussion of DGAT assay methods, followed by a systematic discussion of TAG biosynthesis and the properties and physiological role of DGATs. Thereafter, the review discusses the three-dimensional structure and insights into mechanism of action of human DGAT1, and the modeled DGAT1 from Brassica napus. The review then examines metabolic engineering strategies involving manipulation of DGAT, followed by a discussion of its therapeutic applications. DGAT in relation to improvement of livestock traits is also discussed along with DGATs in various other eukaryotic organisms.
Collapse
Affiliation(s)
- Guanqun Chen
- Department of Agricultural, Food, and Nutritional Science, University of Alberta, Edmonton, Alberta T6H 2P5, Canada.
| | - John L Harwood
- School of Biosciences, Cardiff University, Cardiff CF10 3AX, UK
| | - M Joanne Lemieux
- Department of Biochemistry, University of Alberta, Membrane Protein Disease Research Group, Edmonton T6G 2H7, Canada
| | - Scot J Stone
- Department of Biochemistry, Microbiology and Immunology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E5, Canada.
| | - Randall J Weselake
- Department of Agricultural, Food, and Nutritional Science, University of Alberta, Edmonton, Alberta T6H 2P5, Canada
| |
Collapse
|
15
|
Ghanem M, Lewis GF, Xiao C. Recent advances in cytoplasmic lipid droplet metabolism in intestinal enterocyte. Biochim Biophys Acta Mol Cell Biol Lipids 2022; 1867:159197. [PMID: 35820577 DOI: 10.1016/j.bbalip.2022.159197] [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: 12/24/2021] [Revised: 06/03/2022] [Accepted: 06/14/2022] [Indexed: 11/30/2022]
Abstract
Processing of dietary fats in the intestine is a highly regulated process that influences whole-body energy homeostasis and multiple physiological functions. Dysregulated lipid handling in the intestine leads to dyslipidemia and atherosclerotic cardiovascular disease. In intestinal enterocytes, lipids are incorporated into lipoproteins and cytoplasmic lipid droplets (CLDs). Lipoprotein synthesis and CLD metabolism are inter-connected pathways with multiple points of regulation. This review aims to highlight recent advances in the regulatory mechanisms of lipid processing in the enterocyte, with particular focus on CLDs. In-depth understanding of the regulation of lipid metabolism in the enterocyte may help identify therapeutic targets for the treatment and prevention of metabolic disorders.
Collapse
Affiliation(s)
- Murooj Ghanem
- Department of Anatomy, Physiology and Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, SK, Canada
| | - Gary F Lewis
- Departments of Medicine and Physiology, University of Toronto, and University Health Network, Toronto, ON, Canada
| | - Changting Xiao
- Department of Anatomy, Physiology and Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, SK, Canada.
| |
Collapse
|
16
|
Stone SJ. Mechanisms of intestinal triacylglycerol synthesis. Biochim Biophys Acta Mol Cell Biol Lipids 2022; 1867:159151. [PMID: 35296424 DOI: 10.1016/j.bbalip.2022.159151] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 01/13/2022] [Accepted: 02/16/2022] [Indexed: 02/07/2023]
Abstract
Triacylglycerols are a major source of stored energy that are obtained either from the diet or can be synthesized to some extent by most tissues. Alterations in pathways of triacylglycerol metabolism can result in their excessive accumulation leading to obesity, insulin resistance, cardiovascular disease and nonalcoholic fatty liver disease. Most tissues in mammals synthesize triacylglycerols via the glycerol 3-phosphate pathway. However, in the small intestine the monoacylglycerol acyltransferase pathway is the predominant pathway for triacylglycerol biosynthesis where it participates in the absorption of dietary triacylglycerol. In this review, the enzymes that are part of both the glycerol 3-phosphate and monoacylglycerol acyltransferase pathways and their contributions to intestinal triacylglycerol metabolism are reviewed. The potential of some of the enzymes involved in triacylglycerol synthesis in the small intestine as possible therapeutic targets for treating metabolic disorders associated with elevated triacylglycerol is briefly discussed.
Collapse
Affiliation(s)
- Scot J Stone
- Department of Biochemistry, Microbiology and Immunology, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E5, Canada.
| |
Collapse
|
17
|
Paragh G, Németh Á, Harangi M, Banach M, Fülöp P. Causes, clinical findings and therapeutic options in chylomicronemia syndrome, a special form of hypertriglyceridemia. Lipids Health Dis 2022; 21:21. [PMID: 35144640 PMCID: PMC8832680 DOI: 10.1186/s12944-022-01631-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 01/30/2022] [Indexed: 02/07/2023] Open
Abstract
The prevalence of hypertriglyceridemia has been increasing worldwide. Attention is drawn to the fact that the frequency of a special hypertriglyceridemia entity, named chylomicronemia syndrome, is variable among its different forms. The monogenic form, termed familial chylomicronemia syndrome, is rare, occuring in 1 in every 1 million persons. On the other hand, the prevalence of the polygenic form of chylomicronemia syndrome is around 1:600. On the basis of the genetical alterations, other factors, such as obesity, alcohol consumption, uncontrolled diabetes mellitus and certain drugs may significantly contribute to the development of the multifactorial form. In this review, we aimed to highlight the recent findings about the clinical and laboratory features, differential diagnosis, as well as the epidemiology of the monogenic and polygenic forms of chylomicronemias. Regarding the therapy, differentiation between the two types of the chylomicronemia syndrome is essential, as well. Thus, proper treatment options of chylomicronemia and hypertriglyceridemia will be also summarized, emphasizing the newest therapeutic approaches, as novel agents may offer solution for the effective treatment of these conditions.
Collapse
Affiliation(s)
- György Paragh
- Division of Metabolic Diseases, Department of Internal Medicine, University of Debrecen Faculty of Medicine, Nagyerdei krt. 98, Debrecen, H-4032, Hungary.
| | - Ákos Németh
- Division of Metabolic Diseases, Department of Internal Medicine, University of Debrecen Faculty of Medicine, Nagyerdei krt. 98, Debrecen, H-4032, Hungary
| | - Mariann Harangi
- Division of Metabolic Diseases, Department of Internal Medicine, University of Debrecen Faculty of Medicine, Nagyerdei krt. 98, Debrecen, H-4032, Hungary
| | - Maciej Banach
- Department of Hypertension, WAM University Hospital in Lodz, Medical University of Lodz, Lodz, Poland.,Polish Mother's Memorial Hospital Research Institute (PMMHRI), Lodz, Poland
| | - Péter Fülöp
- Division of Metabolic Diseases, Department of Internal Medicine, University of Debrecen Faculty of Medicine, Nagyerdei krt. 98, Debrecen, H-4032, Hungary
| |
Collapse
|
18
|
Dawa S, Menon D, Arumugam P, Bhaskar AK, Mondal M, Rao V, Gandotra S. Inhibition of Granuloma Triglyceride Synthesis Imparts Control of Mycobacterium tuberculosis Through Curtailed Inflammatory Responses. Front Immunol 2021; 12:722735. [PMID: 34603294 PMCID: PMC8479166 DOI: 10.3389/fimmu.2021.722735] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2021] [Accepted: 08/25/2021] [Indexed: 12/11/2022] Open
Abstract
Lipid metabolism plays a complex and dynamic role in host-pathogen interaction during Mycobacterium tuberculosis infection. While bacterial lipid metabolism is key to the success of the pathogen, the host also offers a lipid rich environment in the form of necrotic caseous granulomas, making this association beneficial for the pathogen. Accumulation of the neutral lipid triglyceride, as lipid droplets within the cellular cuff of necrotic granulomas, is a peculiar feature of pulmonary tuberculosis. The role of triglyceride synthesis in the TB granuloma and its impact on the disease outcome has not been studied in detail. Here, we identified diacylglycerol O-acyltransferase 1 (DGAT1) to be essential for accumulation of triglyceride in necrotic TB granulomas using the C3HeB/FeJ murine model of infection. Treatment of infected mice with a pharmacological inhibitor of DGAT1 (T863) led to reduction in granuloma triglyceride levels and bacterial burden. A decrease in bacterial burden was associated with reduced neutrophil infiltration and degranulation, and a reduction in several pro-inflammatory cytokines including IL1β, TNFα, IL6, and IFNβ. Triglyceride lowering impacted eicosanoid production through both metabolic re-routing and via transcriptional control. Our data suggests that manipulation of lipid droplet homeostasis may offer a means for host directed therapy in Tuberculosis.
Collapse
Affiliation(s)
- Stanzin Dawa
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India.,Cardiorespiratory Disease Biology, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India
| | - Dilip Menon
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India.,Cardiorespiratory Disease Biology, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India
| | - Prabhakar Arumugam
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India.,Cardiorespiratory Disease Biology, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India
| | - Akash Kumar Bhaskar
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India.,Cardiorespiratory Disease Biology, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India
| | - Moumita Mondal
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India.,Cardiorespiratory Disease Biology, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India
| | - Vivek Rao
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India.,Cardiorespiratory Disease Biology, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India
| | - Sheetal Gandotra
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, India.,Cardiorespiratory Disease Biology, CSIR-Institute of Genomics and Integrative Biology, New Delhi, India
| |
Collapse
|
19
|
Abstract
PURPOSE OF REVIEW Nonalcoholic fatty liver disease (NAFLD) is defined as the abnormal accumulation of lipids in the liver, called hepatic steatosis, which occurs most often as a concomitant of the metabolic syndrome. Its incidence has surged significantly in recent decades concomitant with the obesity pandemic and increasing consumption of refined carbohydrates and saturated fats. This makes a review of the origins of NAFLD timely and relevant. RECENT FINDINGS This disorder, which shares histologic markers found in alcoholic fatty liver disease, was named NAFLD to distinguish it from the latter. Recently, however, the term metabolic-associated fatty liver disease (MAFLD) has been suggested as a refinement of NAFLD that should highlight the central, etiologic role of insulin resistance, obesity, and diabetes mellitus. The complexity of the pathways involved in the regulation of hepatic triglyceride synthesis and utilization have become obvious over the past 10 years, including the recent identification of monogenic causes of metabolic-associated fatty liver disease. These include PNPLA3, transmembrane 6 superfamily member 2, GCKR, membrane-bound O-acyltransferase 7 suggest targets for new therapies for hepatic steatosis. SUMMARY The current review can serve as a guide to the complex pathways involved in the maintenance of hepatic triglyceride levels as well as an introduction to the most recent discoveries, including those of key genes that have provided opportunities for new and novel therapeutics.
Collapse
Affiliation(s)
- Leinys S Santos-Baez
- Division of Preventive Medicine and Nutrition, Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA
| | | |
Collapse
|
20
|
Eldredge JA, Couper MR, Barnett CP, Rawlings L, Couper RTL. New Pathogenic Mutations Associated with Diacylglycerol O-Acyltransferase 1 Deficiency. J Pediatr 2021; 233:268-272. [PMID: 33607125 DOI: 10.1016/j.jpeds.2021.02.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 02/11/2021] [Accepted: 02/12/2021] [Indexed: 11/16/2022]
Abstract
Diacylglycerol O-acyltransferase 1 deficiency is a recently discovered, rare congenital diarrheal disorder. We report 2 patients with newly described pathogenic mutations in diacylglycerol O-acyltransferase 1 with compound heterozygous inheritance and unusual phenotypes. This included a macrophage activation syndrome-like response seen in one patient, ameliorated with low dietary fat.
Collapse
Affiliation(s)
- Jessica A Eldredge
- Department of Gastroenterology, Women's & Children's Hospital, Adelaide, South Australia
| | - Michael R Couper
- Department of Gastroenterology, Women's & Children's Hospital, Adelaide, South Australia
| | - Christopher P Barnett
- Paediatric and Reproductive Genetics Unit, Women's & Children's Hospital, Adelaide, South Australia; School of Paediatrics, University of Adelaide, Adelaide, South Australia
| | - Lesley Rawlings
- Genomics Unit, Genetics & Molecular Pathology, SA Pathology, Adelaide, South Australia
| | - Richard T L Couper
- Department of Gastroenterology, Women's & Children's Hospital, Adelaide, South Australia; School of Paediatrics, University of Adelaide, Adelaide, South Australia.
| |
Collapse
|
21
|
Laufs U, Parhofer KG, Ginsberg HN, Hegele RA. Clinical review on triglycerides. Eur Heart J 2021; 41:99-109c. [PMID: 31764986 PMCID: PMC6938588 DOI: 10.1093/eurheartj/ehz785] [Citation(s) in RCA: 255] [Impact Index Per Article: 85.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2019] [Revised: 08/20/2019] [Accepted: 10/23/2019] [Indexed: 12/23/2022] Open
Abstract
Hypertriglyceridaemia is a common clinical problem. Epidemiologic and genetic studies have established that triglyceride-rich lipoproteins (TRL) and their remnants as important contributors to ASCVD while severe hypertriglyceridaemia raises risk of pancreatitis. While low-density lipoprotein is the primary treatment target for lipid lowering therapy, secondary targets that reflect the contribution of TRL such as apoB and non-HDL-C are recommended in the current guidelines. Reduction of severely elevated triglycerides is important to avert or reduce the risk of pancreatitis. Here we discuss interventions for hypertriglyceridaemia, including diet and lifestyle, established treatments such as fibrates and omega-3 fatty acid preparations and emerging therapies, including various biological agents. ![]()
Collapse
Affiliation(s)
- Ulrich Laufs
- Klinik und Poliklinik für Kardiologie, Universitätsklinikum Leipzig, Liebigstr. 20, Leipzig, Germany
| | - Klaus G Parhofer
- University Munich, Medical Department 4 - Grosshadern, Marchioninistr. 15, Munich, Germany
| | - Henry N Ginsberg
- Irving Institute for Clinical and Translational Medicine, Vagelos College of Physicians and Surgeons, Columbia University, 630 West 168th Street, New York, NY, USA
| | - Robert A Hegele
- Department of Medicine, Robarts Research Institute, Western University, London, Ontario, Canada
| |
Collapse
|
22
|
Okazaki H, Gotoda T, Ogura M, Ishibashi S, Inagaki K, Daida H, Hayashi T, Hori M, Masuda D, Matsuki K, Yokoyama S, Harada-Shiba M. Current Diagnosis and Management of Primary Chylomicronemia. J Atheroscler Thromb 2021; 28:883-904. [PMID: 33980761 PMCID: PMC8532063 DOI: 10.5551/jat.rv17054] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Primary chylomicronemia (PCM) is a rare and intractable disease characterized by marked accumulation of chylomicrons in plasma. The levels of plasma triglycerides (TGs) typically range from 1,000 - 15,000 mg/dL or higher.
PCM is caused by defects in the lipoprotein lipase (LPL) pathway due to genetic mutations, autoantibodies, or unidentified causes. The monogenic type is typically inherited as an autosomal recessive trait with loss-of-function mutations in LPL pathway genes (
LPL
,
LMF1
,
GPIHBP1
,
APOC2
, and
APOA5
). Secondary/environmental factors (diabetes, alcohol intake, pregnancy, etc.) often exacerbate hypertriglyceridemia (HTG).
The signs, symptoms, and complications of chylomicronemia include eruptive xanthomas, lipemia retinalis, hepatosplenomegaly, and acute pancreatitis with onset as early as in infancy. Acute pancreatitis can be fatal and recurrent episodes of abdominal pain may lead to dietary fat intolerance and failure to thrive. The main goal of treatment is to prevent acute pancreatitis by reducing plasma TG levels to at least less than 500-1,000 mg/dL. However, current TG-lowering medications are generally ineffective for PCM. The only other treatment options are modulation of secondary/environmental factors. Most patients need strict dietary fat restriction, which is often difficult to maintain and likely affects their quality of life. Timely diagnosis is critical for the best prognosis with currently available management, but PCM is often misdiagnosed and undertreated. The aim of this review is firstly to summarize the pathogenesis, signs, symptoms, diagnosis, and management of PCM, and secondly to propose simple diagnostic criteria that can be readily translated into general clinical practice to improve the diagnostic rate of PCM. In fact, these criteria are currently used to define eligibility to receive social support from the Japanese government for PCM as a rare and intractable disease. Nevertheless, further research to unravel the molecular pathogenesis and develop effective therapeutic modalities is warranted. Nationwide registry research on PCM is currently ongoing in Japan with the aim of better understanding the disease burden as well as the unmet needs of this life-threatening disease with poor therapeutic options.
Collapse
Affiliation(s)
- Hiroaki Okazaki
- Department of Diabetes and Metabolic Diseases, Graduate School of Medicine, The University of Tokyo
| | - Takanari Gotoda
- Department of Metabolic Biochemistry, Faculty of Medicine, Kyorin University
| | - Masatsune Ogura
- Department of Molecular Innovation in Lipidology, National Cerebral and Cardiovascular Center Research Institute
| | - Shun Ishibashi
- Division of Endocrinology and Metabolism, Department of Internal Medicine, School of Medicine, Jichi Medical University
| | - Kyoko Inagaki
- Division of Diabetes, Endocrinology, and Metabolism, Department of Medicine, Nippon Medical School
| | - Hiroyuki Daida
- Faculty of Health Science, Juntendo University, Juntendo University Graduate School of Medicine
| | - Toshio Hayashi
- School of Health Sciences, Nagoya University Graduate School of Medicine
| | - Mika Hori
- Department of Endocrinology, Research Institute of Environmental Medicine, Nagoya University
| | - Daisaku Masuda
- Department of Cardiology, Health Care Center, Rinku Innovation Center for Wellness Care and Activities (RICWA), Rinku General Medical Center
| | - Kota Matsuki
- Department of Endocrinology and Metabolism, Hirosaki University Graduate School of Medicine
| | | | - Mariko Harada-Shiba
- Department of Molecular Pathogenesis, National Cerebral and Cardiovascular Center Research Institute
| | | |
Collapse
|
23
|
Broadfield LA, Pane AA, Talebi A, Swinnen JV, Fendt SM. Lipid metabolism in cancer: New perspectives and emerging mechanisms. Dev Cell 2021; 56:1363-1393. [PMID: 33945792 DOI: 10.1016/j.devcel.2021.04.013] [Citation(s) in RCA: 198] [Impact Index Per Article: 66.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 03/15/2021] [Accepted: 04/08/2021] [Indexed: 12/12/2022]
Abstract
Tumors undergo metabolic transformations to sustain uncontrolled proliferation, avoid cell death, and seed in secondary organs. An increased focus on cancer lipid metabolism has unveiled a number of mechanisms that promote tumor growth and survival, many of which are independent of classical cellular bioenergetics. These mechanisms include modulation of ferroptotic-mediated cell death, support during tumor metastasis, and interactions with the cells of the tumor microenvironment. As such, targeting lipid metabolism for anti-cancer therapies is attractive, with recent work on small-molecule inhibitors identifying compounds to target lipid metabolism. Here, we discuss these topics and identify open questions.
Collapse
Affiliation(s)
- Lindsay A Broadfield
- Laboratory of Cellular Metabolism and Metabolic Regulation, VIB-KU Leuven Center for Cancer Biology, VIB, Leuven, Belgium; Laboratory of Cellular Metabolism and Metabolic Regulation, Department of Oncology, KU Leuven and Leuven Cancer Institute (LKI), Leuven, Belgium
| | - Antonino Alejandro Pane
- Laboratory of Cellular Metabolism and Metabolic Regulation, VIB-KU Leuven Center for Cancer Biology, VIB, Leuven, Belgium; Laboratory of Cellular Metabolism and Metabolic Regulation, Department of Oncology, KU Leuven and Leuven Cancer Institute (LKI), Leuven, Belgium
| | - Ali Talebi
- Department of Oncology, Laboratory of Lipid Metabolism and Cancer, Leuven Cancer Institute (LKI), KU Leuven, University of Leuven, Leuven, Belgium
| | - Johannes V Swinnen
- Department of Oncology, Laboratory of Lipid Metabolism and Cancer, Leuven Cancer Institute (LKI), KU Leuven, University of Leuven, Leuven, Belgium
| | - Sarah-Maria Fendt
- Laboratory of Cellular Metabolism and Metabolic Regulation, VIB-KU Leuven Center for Cancer Biology, VIB, Leuven, Belgium; Laboratory of Cellular Metabolism and Metabolic Regulation, Department of Oncology, KU Leuven and Leuven Cancer Institute (LKI), Leuven, Belgium.
| |
Collapse
|
24
|
Singh Y, Datey A, Chakravortty D, Tumaney AW. Novel Cell-Based Assay to Investigate Monoacylglycerol Acyltransferase 2 Inhibitory Activity Using HIEC-6 Cell Line. ACS OMEGA 2021; 6:1732-1740. [PMID: 33490832 PMCID: PMC7818593 DOI: 10.1021/acsomega.0c05950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Accepted: 12/23/2020] [Indexed: 06/12/2023]
Abstract
The dietary triacylglycerol (TAG) gets absorbed and accumulated in the body through the monoacylglycerol (MAG) pathway, which plays a major role in obesity and related disorders. The main enzyme of this pathway, monoacylglycerol acyltransferase 2 (MGAT2), is considered as a potential target for developing antiobesity compounds. Hence, there is a need for in vitro cell-based assays for screening the potential leads for MGAT2 inhibitors. Because of synthetic inhibitor's side effects, there is an increased interest in natural extracts as potential leads. Hence, we have optimized a 2-MAG-induced TAG accumulation inhibitory cell-based assay to screen natural extracts using the HIEC-6 cell line. A concentration-dependent TAG accumulation was observed when the HIEC-6 cells were fed with exogenous 2-MAG. The TAG accumulation was confirmed by in situ BODIPY staining and was quantified. However, no TAG accumulation was seen when the cells were fed with exogenous DAG or TAG, suggesting MGAT2-mediated MAG uptake and its conversion to TAG. We demonstrated the utility of this assay by screening five different plant-based aqueous extracts. These extracts showed various inhibition levels (25% to 30%) of 2-MAG-induced TAG accumulation in the HIEC-6. The MGAT2 inhibitory potential of these extracts was confirmed by an in vitro MGAT2 assay. This cell-based assay adds a new methodology for screening, developing, and evaluating MGAT2 inhibitors for addressing obesity and related disorders.
Collapse
Affiliation(s)
- Yeshvanthi Singh
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Department
of Lipid Science, Council of Scientific
and Industrial Research−Central Food Technological Research
Institute, Mysuru 570 020, India
| | - Akshay Datey
- Department
of Microbiology and Cell Biology, Indian
Institute of Science, Bangalore 560012, India
| | - Dipshikha Chakravortty
- Department
of Microbiology and Cell Biology, Indian
Institute of Science, Bangalore 560012, India
| | - Ajay W. Tumaney
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Department
of Lipid Science, Council of Scientific
and Industrial Research−Central Food Technological Research
Institute, Mysuru 570 020, India
| |
Collapse
|
25
|
Mah M, Febbraio M, Turpin-Nolan S. Circulating Ceramides- Are Origins Important for Sphingolipid Biomarkers and Treatments? Front Endocrinol (Lausanne) 2021; 12:684448. [PMID: 34385976 PMCID: PMC8353232 DOI: 10.3389/fendo.2021.684448] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 06/23/2021] [Indexed: 01/13/2023] Open
Abstract
Biomarkers are important tools for describing the adequacy or inadequacy of biological processes (to allow for the early and accurate diagnosis) and monitoring the biological effects of intervention strategies (to identify and develop optimal dose and treatment strategies). A number of lipid biomarkers are implicated in metabolic disease and the circulating levels of these biomarkers are used in clinical settings to predict and monitor disease severity. There is convincing evidence that specific circulating ceramide species can be used as biological predictors and markers of cardiovascular disease, atherosclerosis and type 2 diabetes mellitus. Here, we review the existing literature that investigated sphingolipids as biomarkers for metabolic disease prediction. What are the advantages and disadvantages? Are circulating ceramides predominantly produced in the liver? Will hepatic sphingolipid inhibitors be able to completely prevent and treat metabolic disease? As sphingolipids are being employed as biomarkers and potential metabolic disease treatments, we explore what is currently known and what still needs to be discovered.
Collapse
|
26
|
Amin NB, Carvajal-Gonzalez S, Purkal J, Zhu T, Crowley C, Perez S, Chidsey K, Kim AM, Goodwin B. Targeting diacylglycerol acyltransferase 2 for the treatment of nonalcoholic steatohepatitis. Sci Transl Med 2020; 11:11/520/eaav9701. [PMID: 31776293 DOI: 10.1126/scitranslmed.aav9701] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 02/25/2019] [Accepted: 11/08/2019] [Indexed: 12/14/2022]
Abstract
Nonalcoholic steatohepatitis (NASH) is characterized by the accumulation of hepatocyte triglycerides, the synthesis of which is catalyzed by diacylglycerol acyltransferases (DGATs). Here, we investigate DGAT2 as a potential therapeutic target using an orally administered, selective DGAT2 inhibitor, PF-06427878. Treatment with PF-06427878 resulted in the reduction of hepatic and circulating plasma triglyceride concentrations and decreased lipogenic gene expression in rats maintained on a Western-type diet. In a mouse model of NASH, histological improvements in steatosis, ballooning, and fibrosis were evident in the livers of animals receiving PF-06427878 compared with mice treated with vehicle alone. We extended these nonclinical studies to two phase 1 studies in humans [NCT02855177 (n = 24) and NCT02391623 (n = 39; n = 38 completed)] and observed that PF-06427878 was well tolerated and influenced markers of liver function (alanine aminotransferase, aspartate aminotransferase, alkaline phosphatase, and total bilirubin) in healthy adults, with statistically significant reductions from baseline at day 14 in participants treated with PF-06427878 1500 milligrams per day (P < 0.05). Moreover, magnetic resonance imaging using proton density fat fraction showed that PF-06427878 1500 milligrams per day reduced hepatic steatosis in healthy adult participants. Our findings highlight DGAT2 inhibition by a small, potent, selective compound as a potential therapeutic approach for the treatment of NASH.
Collapse
Affiliation(s)
- Neeta B Amin
- Internal Medicine Research Unit, Pfizer Worldwide Research and Development, Cambridge, MA 02139, USA.
| | | | - Julie Purkal
- Internal Medicine Research Unit, Pfizer Worldwide Research and Development, Cambridge, MA 02139, USA
| | - Tong Zhu
- Early Clinical Development, Pfizer Worldwide Research and Development, Cambridge, MA 02139, USA
| | - Collin Crowley
- Internal Medicine Research Unit, Pfizer Worldwide Research and Development, Cambridge, MA 02139, USA
| | - Sylvie Perez
- Internal Medicine Research Unit, Pfizer Worldwide Research and Development, Cambridge, MA 02139, USA
| | - Kristin Chidsey
- Early Clinical Development, Pfizer Worldwide Research and Development, Cambridge, MA 02139, USA
| | - Albert M Kim
- Internal Medicine Research Unit, Pfizer Worldwide Research and Development, Cambridge, MA 02139, USA
| | - Bryan Goodwin
- Internal Medicine Research Unit, Pfizer Worldwide Research and Development, Cambridge, MA 02139, USA
| |
Collapse
|
27
|
Zambre VP, Khamkar SM, Gavhane DD, Khedkar SC, Chavan MR, Pandey MM, Sanap SB, Patil RB, Sawant SD. Patent landscape for discovery of promising acyltransferase DGAT and MGAT inhibitors. Expert Opin Ther Pat 2020; 30:873-896. [PMID: 32878484 DOI: 10.1080/13543776.2020.1815707] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
INTRODUCTION DGAT and MGAT enzymes play an important role in triacylglycerol (TGA) biosynthesis. Overexpression of these enzymes may lead to accumulation of TGA in adipose tissues causing development of diseases such as obesity and diabetes. High triglyceride levels increase risk factors for atherosclerosis, and increase the risk of heart attack, stroke and other heart diseases. DGAT and MGAT inhibitors are used for the treatment of such metabolic diseases. A number of DGAT and MGAT inhibitors entered into clinical and preclinical stages. However, some adverse effects are associated with them. Thus there is need to develop new, potent and safe DGAT and MGAT inhibitors. AREA COVERED In this review, the authors carefully searched patent literature and reviewed recent advances since the year 2014. Diverse chemical classes reported in the patents belonging to the category DGAT and MGAT inhibitors have been highlighted. EXPERT OPINION DGAT and MGAT inhibitors are now gaining significant importance in the treatment of metabolic diseases. Fused heterocycles with a combination of aromatic and aliphatic hydrophobic substituents could offer more potent DGAT and MGAT inhibitors. Previously reported chemical scaffolds and their DGAT and MGAT inhibitory activity could be employed as an input for some in silico studies to discover novel, potent and safe DGAT and MGAT inhibitors.
Collapse
Affiliation(s)
- Vishal P Zambre
- Department of Pharmaceutical Chemistry, Smt. Kashibai Navale College of Pharmacy, Savitribai Phule Pune University , Pune, India
| | - Shamali M Khamkar
- Department of Pharmaceutical Chemistry, Smt. Kashibai Navale College of Pharmacy, Savitribai Phule Pune University , Pune, India
| | - Dnyaneshwar D Gavhane
- Department of Pharmaceutical Chemistry, Smt. Kashibai Navale College of Pharmacy, Savitribai Phule Pune University , Pune, India
| | - Sagar C Khedkar
- Department of Pharmaceutical Chemistry, Smt. Kashibai Navale College of Pharmacy, Savitribai Phule Pune University , Pune, India
| | - Monali R Chavan
- Department of Pharmaceutical Chemistry, Smt. Kashibai Navale College of Pharmacy, Savitribai Phule Pune University , Pune, India
| | - Madhuri M Pandey
- Department of Pharmaceutical Chemistry, Smt. Kashibai Navale College of Pharmacy, Savitribai Phule Pune University , Pune, India
| | - Sonali B Sanap
- Department of Pharmaceutical Chemistry, Smt. Kashibai Navale College of Pharmacy, Savitribai Phule Pune University , Pune, India
| | - Rajesh B Patil
- Department of Pharmaceutical Chemistry, Smt. Kashibai Navale College of Pharmacy, Savitribai Phule Pune University , Pune, India
| | - Sanjay D Sawant
- Department of Pharmaceutical Chemistry, Smt. Kashibai Navale College of Pharmacy, Savitribai Phule Pune University , Pune, India
| |
Collapse
|
28
|
Vujić N, Korbelius M, Sachdev V, Rainer S, Zimmer A, Huber A, Radović B, Kratky D. Intestine-specific DGAT1 deficiency improves atherosclerosis in apolipoprotein E knockout mice by reducing systemic cholesterol burden. Atherosclerosis 2020; 310:26-36. [PMID: 32882484 PMCID: PMC7116265 DOI: 10.1016/j.atherosclerosis.2020.07.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/22/2020] [Revised: 06/25/2020] [Accepted: 07/31/2020] [Indexed: 12/17/2022]
Abstract
Background and aims Acyl-CoA:diacylglycerol acyltransferase 1 (DGAT1) is the rate-limiting enzyme catalyzing the final step of triglyceride synthesis by esterifying a diglyceride with a fatty acid. We have previously shown that apolipoprotein E-knockout (ApoE−/−) mice lacking Dgat1 have reduced intestinal cholesterol absorption and potentiated macrophage cholesterol efflux, and consequently, exhibit attenuated atherogenesis. However, he-matopoietic Dgat1 deficiency lacked beneficial effects on atherosclerosis. Due to our recent results on the critical role of intestinal Dgat1 in murine cholesterol homeostasis, we delineated whether intestinal Dgat1 deficiency regulates atherogenesis in mice. Methods We generated intestine-specific Dgat1−/− mice on the ApoE−/− background (iDgat1−/−ApoE−/−) and determined cholesterol homeostasis and atherosclerosis development. Results When fed a Western-type diet, iDgat1−/−ApoE−/− mice exhibited a substantial decrease in fasting plasma cholesterol content in ApoB-containing lipoproteins. Although lipid absorption was delayed, iDgat1−/−ApoE−/− mice had reduced acute and fractional cholesterol absorption coupled with an elevated fecal caloric loss. In line, increased appearance of i.v. administered [3H]cholesterol in duodena and stool of iDgat1−/−ApoE−/− animals suggested potentiated cholesterol elimination. Atherosclerotic lesions were markedly smaller with beneficial alterations in plaque composition as evidenced by reduced macrophage infiltration and necrotic core size despite unaltered collagen content, indicating improved plaque stability. Conclusions Disruption of Dgat1 activity solely in the small intestine of ApoE−/− mice strongly decreased plasma cholesterol levels by abrogating the assimilation of dietary cholesterol, partly by reduced absorption and increased excretion. Consequently, the reduced cholesterol burden significantly attenuated atherogenesis and improved the lesion phenotype in iDgat1−/−ApoE−/− mice.
Collapse
Affiliation(s)
- Nemanja Vujić
- Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria; BioTechMed-Graz, Graz, Austria
| | - Melanie Korbelius
- Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria; BioTechMed-Graz, Graz, Austria
| | - Vinay Sachdev
- Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Silvia Rainer
- Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria
| | - Andreas Zimmer
- Institute of Pharmaceutical Sciences, University of Graz, Graz, Austria; BioTechMed-Graz, Graz, Austria
| | - Anton Huber
- Institute of Chemistry, University of Graz, Graz, Austria
| | - Branislav Radović
- Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria; BioTechMed-Graz, Graz, Austria
| | - Dagmar Kratky
- Gottfried Schatz Research Center, Medical University of Graz, Graz, Austria; BioTechMed-Graz, Graz, Austria.
| |
Collapse
|
29
|
Takemoto K, Fukasaka Y, Yoshimoto R, Nambu H, Yukioka H. Diacylglycerol acyltransferase 1/2 inhibition induces dysregulation of fatty acid metabolism and leads to intestinal barrier failure and diarrhea in mice. Physiol Rep 2020; 8:e14542. [PMID: 32786057 PMCID: PMC7422801 DOI: 10.14814/phy2.14542] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Revised: 07/19/2020] [Accepted: 07/20/2020] [Indexed: 02/06/2023] Open
Abstract
The intestinal metabolism and transport of triacylglycerol (TAG) play a critical role in dietary TAG absorption, and defects in the process are associated with congenital diarrhea. The final reaction in TAG synthesis is catalyzed by diacylglycerol acyltransferase (DGAT1 and DGAT2), which uses activated fatty acids (FA) as substrates. Loss-of-function mutations in DGAT1 cause watery diarrhea in humans, but mechanisms underlying the relationship between altered DGAT activity and diarrhea remain largely unclear. Here, the effects of DGAT1 and DGAT2 inhibition, alone or in combination, on dietary TAG absorption and diarrhea in mice were investigated by using a selective DGAT1 inhibitor (PF-04620110) and DGAT2 inhibitor (PF-06424439). Simultaneous administration of a single dosing of these inhibitors drastically decreased intestinal TAG secretion into the blood circulatory system and TAG accumulation in the duodenum at 60 min after lipid gavage. Under 60% high-fat diet (HFD) feeding, their repeated simultaneous administration for 2 days induced severe watery diarrhea and occasionally led to death. The diarrhea was accompanied by enhanced fecal FA excretion, intestinal injury and barrier failure. DGAT1 or DGAT2 inhibition alone did not induce the phenotypic changes observed in DGAT1/2 inhibitor-treated mice. The results demonstrate that DGAT1/2 inhibition alters TAG absorption and results in watery diarrhea in mice. DGAT1/2 inhibition-induced diarrhea may be caused by intestinal barrier dysfunction due to dysregulation of the cytotoxic FA metabolism. These findings suggest that DGAT-mediated intestinal TAG synthesis is a vital step for maintaining intestinal barrier integrity under HFD feeding.
Collapse
Affiliation(s)
- Kosuke Takemoto
- Drug Discovery & Disease Research LaboratoryShionogi & Co., LtdOsakaJapan
- Laboratory of Veterinary Pathology, Joint Faculty of Veterinary MedicineYamaguchi UniversityYamaguchiJapan
| | - Yumiko Fukasaka
- Drug Discovery & Disease Research LaboratoryShionogi & Co., LtdOsakaJapan
| | - Ryo Yoshimoto
- Drug Discovery & Disease Research LaboratoryShionogi & Co., LtdOsakaJapan
| | - Hirohide Nambu
- Drug Discovery & Disease Research LaboratoryShionogi & Co., LtdOsakaJapan
| | - Hideo Yukioka
- Drug Discovery & Disease Research LaboratoryShionogi & Co., LtdOsakaJapan
| |
Collapse
|
30
|
Soppert J, Lehrke M, Marx N, Jankowski J, Noels H. Lipoproteins and lipids in cardiovascular disease: from mechanistic insights to therapeutic targeting. Adv Drug Deliv Rev 2020; 159:4-33. [PMID: 32730849 DOI: 10.1016/j.addr.2020.07.019] [Citation(s) in RCA: 90] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 07/20/2020] [Accepted: 07/22/2020] [Indexed: 12/12/2022]
Abstract
With cardiovascular disease being the leading cause of morbidity and mortality worldwide, effective and cost-efficient therapies to reduce cardiovascular risk are highly needed. Lipids and lipoprotein particles crucially contribute to atherosclerosis as underlying pathology of cardiovascular disease and influence inflammatory processes as well as function of leukocytes, vascular and cardiac cells, thereby impacting on vessels and heart. Statins form the first-line therapy with the aim to block cholesterol synthesis, but additional lipid-lowering drugs are sometimes needed to achieve low-density lipoprotein (LDL) cholesterol target values. Furthermore, beyond LDL cholesterol, also other lipid mediators contribute to cardiovascular risk. This review comprehensively discusses low- and high-density lipoprotein cholesterol, lipoprotein (a), triglycerides as well as fatty acids and derivatives in the context of cardiovascular disease, providing mechanistic insights into their role in pathological processes impacting on cardiovascular disease. Also, an overview of applied as well as emerging therapeutic strategies to reduce lipid-induced cardiovascular burden is provided.
Collapse
Affiliation(s)
- Josefin Soppert
- Institute for Molecular Cardiovascular Research (IMCAR), University Hospital Aachen, Aachen, Germany
| | - Michael Lehrke
- Medical Clinic I, University Hospital Aachen, Aachen, Germany
| | - Nikolaus Marx
- Medical Clinic I, University Hospital Aachen, Aachen, Germany
| | - Joachim Jankowski
- Institute for Molecular Cardiovascular Research (IMCAR), University Hospital Aachen, Aachen, Germany; Department of Pathology, Cardiovascular Research Institute Maastricht, Maastricht University Medical Centre, Maastricht University, the Netherlands
| | - Heidi Noels
- Institute for Molecular Cardiovascular Research (IMCAR), University Hospital Aachen, Aachen, Germany; Department of Biochemistry, Cardiovascular Research Institute Maastricht, Maastricht University, the Netherlands.
| |
Collapse
|
31
|
Free Fatty Acid-Induced Peptide YY Expression Is Dependent on TG Synthesis Rate and Xbp1 Splicing. Int J Mol Sci 2020; 21:ijms21093368. [PMID: 32397573 PMCID: PMC7247705 DOI: 10.3390/ijms21093368] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 05/06/2020] [Accepted: 05/08/2020] [Indexed: 12/27/2022] Open
Abstract
Gut-derived satiety hormones provide negative feedback to suppress food intake and maintain metabolic function in peripheral tissues. Despite the wealth of knowledge of the systemic effects of these hormones, very little is known concerning the mechanisms by which nutrients, such as dietary fats, can promote the expression of genes involved in L-cell hormone production. We have tested the role of various dietary fats and found that after hydrolysis into free fatty acids (FFA’s), there is a differential response in the extent to which they induce PYY gene and protein production. The effect of FFA’s also seems to relate to triglyceride (TG) re-esterification rate, with MUFA re-esterifying faster with lower PYY production. We have also found that there are differences in potency of FFA’s based on their desaturation patterns in vitro. The potency effect of FFA’s is influenced by the rate of TG re-esterification, such that the longer FFA’s are in contact with L-cells, the more PYY they produce. We found that chronic consumption of high-fat diets enables the small intestine to re-esterify FFA’s into TG faster and earlier which resulted in a blunted postprandial PYY response. Lastly, we found that FFA’s induce X-box-binding protein-1 activation (Xbp1s) in L-cells and that adenoviral delivery of Xbp1s was sufficient to induce PYY gene expression. Taken together, the present work indicates that dietary fat can induce satiety, in part, prior to re-esterification. Chronic high-fat diet consumption increases the rate of re-esterification which diminishes satiety and may lead to increased food intake. Targeting intestinal TG synthesis may prove beneficial in restoring obesity-associated reductions in postprandial satiety.
Collapse
|
32
|
Tomlinson B, Chan P, Zhang Y, Liu Z, Lam CWK. Pharmacokinetics of current and emerging treatments for hypercholesterolemia. Expert Opin Drug Metab Toxicol 2020; 16:371-385. [PMID: 32223657 DOI: 10.1080/17425255.2020.1749261] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Introduction: Reduction of low-density-lipoprotein cholesterol (LDL-C) and other apolipoprotein B (apoB)-containing lipoproteins reduces cardiovascular (CV) events and greater reductions have greater benefits. Current lipid treatments cannot always achieve desirable LDL-C targets and additional or alternative treatments are often needed.Areas covered: In this article, we review the pharmacokinetics of the available and emerging treatments for hypercholesterolemia and focus on recently approved drugs and those at a late stage of development.Expert opinion: Statin pharmacokinetics are well known and appropriate drugs and doses can usually be chosen for individual patients to achieve LDL-C targets and avoid adverse effects and drug-drug interactions. Ezetimibe, icosapent ethyl and the monoclonal antibodies evolocumab and alirocumab have established efficacy and safety. Newer oral agents including pemafibrate and bempedoic acid have generally favorable pharmacokinetics supporting use in a wide range of patients. RNA-based therapies with antisense oligonucleotides are highly specific for their targets and those inhibiting apoB, apoCIII, angiopoietin-like protein 3 and lipoprotein(a) have shown promising results. The small-interfering RNA inclisiran has the notable advantage that a single subcutaneous administration may be effective for up to 6 months. The CV outcome trial results and long term safety data are eagerly awaited for these new agents.
Collapse
Affiliation(s)
- Brian Tomlinson
- Faculty of Medicine, Macau University of Science and Technology, Macau, China
| | - Paul Chan
- Division of Cardiology, Department of Internal Medicine, Wan Fang Hospital, Taipei Medical University, Taipei City, Taiwan.,Research Center for Translational Medicine, Shanghai East Hospital Affiliated to Tongji University School of Medicine, Shanghai, China
| | - Yuzhen Zhang
- Research Center for Translational Medicine, Shanghai East Hospital Affiliated to Tongji University School of Medicine, Shanghai, China
| | - Zhongmin Liu
- Research Center for Translational Medicine, Shanghai East Hospital Affiliated to Tongji University School of Medicine, Shanghai, China
| | | |
Collapse
|
33
|
Stahel P, Xiao C, Nahmias A, Lewis GF. Role of the Gut in Diabetic Dyslipidemia. Front Endocrinol (Lausanne) 2020; 11:116. [PMID: 32231641 PMCID: PMC7083132 DOI: 10.3389/fendo.2020.00116] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 02/21/2020] [Indexed: 12/13/2022] Open
Abstract
Type 2 diabetes (T2D) is associated with increased risk of cardiovascular disease (CVD). In insulin resistant states such as the metabolic syndrome, overproduction and impaired clearance of liver-derived very-low-density lipoproteins and gut-derived chylomicrons (CMs) contribute to hypertriglyceridemia and elevated atherogenic remnant lipoproteins. Although ingested fat is the major stimulus of CM secretion, intestinal lipid handling and ultimately CM secretory rate is determined by numerous additional regulatory inputs including nutrients, hormones and neural signals that fine tune CM secretion during fasted and fed states. Insulin resistance and T2D represent perturbed metabolic states in which intestinal sensitivity to key regulatory hormones such as insulin, leptin and glucagon-like peptide-1 (GLP-1) may be altered, contributing to increased CM secretion. In this review, we describe the evidence from human and animal models demonstrating increased CM secretion in insulin resistance and T2D and discuss the molecular mechanisms underlying these effects. Several novel compounds are in various stages of preclinical and clinical investigation to modulate intestinal CM synthesis and secretion. Their efficacy, safety and therapeutic utility are discussed. Similarly, the effects of currently approved lipid modulating therapies such as statins, ezetimibe, fibrates, and PCSK9 inhibitors on intestinal CM production are discussed. The intricacies of intestinal CM production are an active area of research that may yield novel therapies to prevent atherosclerotic CVD in insulin resistance and T2D.
Collapse
|
34
|
Abstract
Introduction: Obesity is compounded by a neurobiology that is resistant to weight loss. Therefore, the development of pharmacotherapies to address the pathology underlying the dysregulation of energy homeostasis is critical.Areas covered: This review examines selected clinical trial evidence for the pharmacologic treatment of obesity and provides an expert opinion on anti-obesity drug development. The article includes the outcomes of anti-obesity medications that have been evaluated in clinical trials but have not yet received approval from the U.S. Food and Drug Administration. The mechanisms of action of glucagon-like peptide-1 agonists and co-agonists, diabetes medications being investigated for weight loss, and medications acting on the central nervous system as well as peripherally are reviewed. A search was conducted on PubMed using the terms 'Obesity AND Medications' restricted to clinical trials reported in English. Using similar terms, a search was also conducted on ClinicalTrials.gov.Expert opinion: The goal of anti-obesity therapy is finding compounds that are effective and have minimal side effects. Combining medications targeting more than one of the redundant mechanisms driving obesity increases efficacy. However, targeting peripheral mechanisms to overcome the trickle-down effects of centrally acting drugs may be the key to success in treating obesity.
Collapse
Affiliation(s)
- Candida J Rebello
- Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, LA, USA
| | - Frank L Greenway
- Pennington Biomedical Research Center, Louisiana State University System, Baton Rouge, LA, USA
| |
Collapse
|
35
|
Wnt signaling mediates TLR pathway and promote unrestrained adipogenesis and metaflammation: Therapeutic targets for obesity and type 2 diabetes. Pharmacol Res 2019; 152:104602. [PMID: 31846761 DOI: 10.1016/j.phrs.2019.104602] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/03/2019] [Revised: 11/17/2019] [Accepted: 12/13/2019] [Indexed: 12/11/2022]
Abstract
Diabesity is the combination of type 2 diabetes and obesity characterized by chronic low-grade inflammation. The Wnt signaling act as an evolutionary pathway playing crucial role in regulating cellular homeostasis and energy balance from hypothalamus to metabolic organs. Aberrant activity of certain appendages in the canonical and non-canonical Wnt system deregulates metabolism and leads to adipose tissue expansion, this key event initiates metabolic stress causing metaflammation and obesity. Metaflammation induced obesity initiates abnormal development of adipocytes mediating through the non-canonical Wnt signaling inhibition of canonical Wnt pathway to fan the flames of adipogenesis. Moreover, activation of toll like receptor (TLR)-4 signaling in metabolic stress invites immune cells to release pro-inflammatory cytokines for recruitment of macrophages in adipose tissues, further causes polarization of macrophages into M1(classically activated) and M2 (alternatively activated) subtypes. These events end with chronic low-grade inflammation which interferes with insulin signaling in metabolic tissues to develop type 2 diabetes. However, there is a dearth in understanding the exact mechanism of Wnt-TLR axis during diabesity. This review dissects the molecular facets of Wnt and TLRs that modulates cellular components during diabesity and provides current progress, challenges and alternative therapeutic strategies at preclinical and clinical level.
Collapse
|
36
|
Gupta A, Dsouza NR, Zarate YA, Lombardo R, Hopkin R, Linehan AR, Simpson J, McCarrier J, Agre KE, Gavrilova RH, Stephens MC, Grothe RM, Monaghan KG, Xie Y, Basel D, Urrutia RA, Cole CR, Klee EW, Zimmermann MT. Genetic variants in DGAT1 cause diverse clinical presentations of malnutrition through a specific molecular mechanism. Eur J Med Genet 2019; 63:103817. [PMID: 31778854 DOI: 10.1016/j.ejmg.2019.103817] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 09/30/2019] [Accepted: 11/24/2019] [Indexed: 01/01/2023]
Abstract
BACKGROUND DGAT1, a gene encoding a protein involved in lipid metabolism, has been recently implicated in causing a rare nutritional and digestive disease presenting as Congenital Diarrheal Disorder (CDD). Genetic causes of malnutrition can be classified as metabolic disorders, caused by loss of a specific enzyme's function. However, disease driven by genetic variants in lipid metabolism genes is not well understood, and additional information is needed to better understand these effects. METHODS We gathered a multi-institutional cohort of undiagnosed patients with a constellation of phenotypes presenting as malnutrition and metal ion dysregulation. Clinical Whole Exome Sequencing (WES) was performed on four patients and their unaffected parents. We prioritized genetic variants based on multiple criteria including population allele frequency and presumed inheritance pattern, and identified a candidate gene. Computational modeling was used to investigate if the altered amino acids are likely to result in a dysfunctional enzyme. RESULTS We identified a multi-institutional cohort of patients presenting with malnutrition-like symptoms and likely pathogenic genomic variants within DGAT1. Multiple approaches were used to profile the effect these variants have on protein structure and function. Laboratory and nutritional intervention studies showed rapid and robust patient responses. CONCLUSIONS This report adds on to the database for existing mutations known within DGAT1, a gene recently implicated with CDD, and also expands its clinical spectrum. Identification of these DGAT1 mutations by WES has allowed for changes in the patients' nutritional rehabilitation, reversed growth failure and enabled them to be weaned off of total parenteral nutrition (TPN).
Collapse
Affiliation(s)
- Aditi Gupta
- Center for Individualized Medicine, Mayo Clinic, Rochester, MN, 55905, USA; Department of Health Sciences Research, Mayo Clinic, Rochester, MN, 55905, USA
| | - Nikita R Dsouza
- Bioinformatics Research and Development Laboratory, Genomic Sciences and Precision Medicine Center, Medical College of Wisconsin, Milwaukee, WI, 53226, USA
| | - Yuri A Zarate
- Section of Genetics and Metabolism, University of Arkansas for Medical Sciences, Arkansas Children's Hospital, Little Rock, AR, 72202, USA
| | - Rachel Lombardo
- Human Genetics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Robert Hopkin
- Human Genetics, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA
| | - Allison R Linehan
- Bioinformatics Research and Development Laboratory, Genomic Sciences and Precision Medicine Center, Medical College of Wisconsin, Milwaukee, WI, 53226, USA
| | - Jamela Simpson
- Bioinformatics Research and Development Laboratory, Genomic Sciences and Precision Medicine Center, Medical College of Wisconsin, Milwaukee, WI, 53226, USA
| | - Julie McCarrier
- Division of Genetics, Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI, 53226, USA
| | | | - Ralitza H Gavrilova
- Center for Individualized Medicine, Mayo Clinic, Rochester, MN, 55905, USA; Clinical Genomics, Mayo Clinic, Rochester, MN, 55905, USA
| | | | - Rayna M Grothe
- Pediatric Gastroenterology, Mayo Clinic, Rochester, MN, 55905, USA
| | | | - Yili Xie
- GeneDx, Gaithersburg, MD, 20877, USA
| | - Donald Basel
- Division of Genetics, Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI, 53226, USA
| | - Raul A Urrutia
- Bioinformatics Research and Development Laboratory, Genomic Sciences and Precision Medicine Center, Medical College of Wisconsin, Milwaukee, WI, 53226, USA; Department of Surgery, Medical College of Wisconsin, Milwaukee, WI, 53226, USA
| | - Conrad R Cole
- Division of Gastroenterology, Hepatology and Nutrition, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, 45229, USA; Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, 45267, USA
| | - Eric W Klee
- Center for Individualized Medicine, Mayo Clinic, Rochester, MN, 55905, USA; Department of Health Sciences Research, Mayo Clinic, Rochester, MN, 55905, USA; Clinical Genomics, Mayo Clinic, Rochester, MN, 55905, USA; Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, MN, 55905, USA.
| | - Michael T Zimmermann
- Bioinformatics Research and Development Laboratory, Genomic Sciences and Precision Medicine Center, Medical College of Wisconsin, Milwaukee, WI, 53226, USA; Clinical and Translational Sciences Institute, Medical College of Wisconsin, Milwaukee, WI, 53226, USA.
| |
Collapse
|
37
|
Florentin M, Kostapanos MS, Anagnostis P, Liamis G. Recent developments in pharmacotherapy for hypertriglyceridemia: what’s the current state of the art? Expert Opin Pharmacother 2019; 21:107-120. [PMID: 31738617 DOI: 10.1080/14656566.2019.1691523] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Matilda Florentin
- Department of Internal Medicine, School of Medicine, University of Ioannina, Ioannina, Greece
| | - Michael S Kostapanos
- Lipid clinic, Department of General Medicine, Addenbrooke’s Hospital, Cambridge University Hospitals NHS Foundation Trust, Cambridge, UK
| | - Panagiotis Anagnostis
- Unit of reproductive endocrinology, 1st Department of Obstetrics and Gynecology, Aristotle University of Thessaloniki, Thessaloniki, Greece
| | - George Liamis
- Department of Internal Medicine, School of Medicine, University of Ioannina, Ioannina, Greece
| |
Collapse
|
38
|
Abstract
Several new or emerging drugs for dyslipidemia owe their existence, in part, to human genetic evidence, such as observations in families with rare genetic disorders or in Mendelian randomization studies. Much effort has been directed to agents that reduce LDL (low-density lipoprotein) cholesterol, triglyceride, and Lp[a] (lipoprotein[a]), with some sustained programs on agents to raise HDL (high-density lipoprotein) cholesterol. Lomitapide, mipomersen, AAV8.TBG.hLDLR, inclisiran, bempedoic acid, and gemcabene primarily target LDL cholesterol. Alipogene tiparvovec, pradigastat, and volanesorsen primarily target elevated triglycerides, whereas evinacumab and IONIS-ANGPTL3-LRx target both LDL cholesterol and triglyceride. IONIS-APO(a)-LRx targets Lp(a).
Collapse
Affiliation(s)
- Robert A Hegele
- From the Department of Medicine and Robarts Research Institute, Schulich School of Medicine and Dentistry, Western University, London, Ontario, Canada (R.A.H.)
| | - Sotirios Tsimikas
- Sulpizio Cardiovascular Center, Vascular Medicine Program, University of California San Diego, La Jolla (S.T.)
| |
Collapse
|
39
|
Glicksberg BS, Amadori L, Akers NK, Sukhavasi K, Franzén O, Li L, Belbin GM, Ayers KL, Shameer K, Badgeley MA, Johnson KW, Readhead B, Darrow BJ, Kenny EE, Betsholtz C, Ermel R, Skogsberg J, Ruusalepp A, Schadt EE, Dudley JT, Ren H, Kovacic JC, Giannarelli C, Li SD, Björkegren JLM, Chen R. Integrative analysis of loss-of-function variants in clinical and genomic data reveals novel genes associated with cardiovascular traits. BMC Med Genomics 2019; 12:108. [PMID: 31345219 PMCID: PMC6657044 DOI: 10.1186/s12920-019-0542-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Background Genetic loss-of-function variants (LoFs) associated with disease traits are increasingly recognized as critical evidence for the selection of therapeutic targets. We integrated the analysis of genetic and clinical data from 10,511 individuals in the Mount Sinai BioMe Biobank to identify genes with loss-of-function variants (LoFs) significantly associated with cardiovascular disease (CVD) traits, and used RNA-sequence data of seven metabolic and vascular tissues isolated from 600 CVD patients in the Stockholm-Tartu Atherosclerosis Reverse Network Engineering Task (STARNET) study for validation. We also carried out in vitro functional studies of several candidate genes, and in vivo studies of one gene. Results We identified LoFs in 433 genes significantly associated with at least one of 10 major CVD traits. Next, we used RNA-sequence data from the STARNET study to validate 115 of the 433 LoF harboring-genes in that their expression levels were concordantly associated with corresponding CVD traits. Together with the documented hepatic lipid-lowering gene, APOC3, the expression levels of six additional liver LoF-genes were positively associated with levels of plasma lipids in STARNET. Candidate LoF-genes were subjected to gene silencing in HepG2 cells with marked overall effects on cellular LDLR, levels of triglycerides and on secreted APOB100 and PCSK9. In addition, we identified novel LoFs in DGAT2 associated with lower plasma cholesterol and glucose levels in BioMe that were also confirmed in STARNET, and showed a selective DGAT2-inhibitor in C57BL/6 mice not only significantly lowered fasting glucose levels but also affected body weight. Conclusion In sum, by integrating genetic and electronic medical record data, and leveraging one of the world’s largest human RNA-sequence datasets (STARNET), we identified known and novel CVD-trait related genes that may serve as targets for CVD therapeutics and as such merit further investigation. Electronic supplementary material The online version of this article (10.1186/s12920-019-0542-3) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Benjamin S Glicksberg
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,The Institute for Next Generation Healthcare, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,Bakar Computational Health Sciences Institute, University of California San Francisco, San Francisco, 94158, CA, USA
| | - Letizia Amadori
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,Cardiovascular Research Center and Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Nicholas K Akers
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Katyayani Sukhavasi
- Department of Pathophysiology, Institute of Biomedicine and Translation Medicine, University of Tartu, Biomeedikum, Ravila 19, 50411, Tartu, Estonia
| | - Oscar Franzén
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,Clinical Gene Networks AB, Jungfrugatan 10, 114 44, Stockholm, Sweden.,Integrated Cardio Metabolic Centre, Department of Medicine, Karolinska Institutet, Novum, 14157, Huddinge, Sweden
| | - Li Li
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,The Institute for Next Generation Healthcare, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Gillian M Belbin
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,Charles Bronfman Institute of Personalized Medicine, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Kristin L Ayers
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,Sema4, a Mount Sinai venture, Stamford, CT, 06902, USA
| | - Khader Shameer
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,The Institute for Next Generation Healthcare, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Marcus A Badgeley
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,The Institute for Next Generation Healthcare, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Kipp W Johnson
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,The Institute for Next Generation Healthcare, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Ben Readhead
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,The Institute for Next Generation Healthcare, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Bruce J Darrow
- Cardiovascular Research Center and Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Eimear E Kenny
- Charles Bronfman Institute of Personalized Medicine, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,Department of Preventive Medicine, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Christer Betsholtz
- Department of Immunology, Genetics and Pathology, Uppsala University, 751 85, Uppsala, Sweden
| | - Raili Ermel
- Department of Cardiac Surgery, Tartu University Hospital, 1a Ludwig Puusepa Street, 50406, Tartu, Estonia
| | - Josefin Skogsberg
- Integrated Cardio Metabolic Centre, Department of Medicine, Karolinska Institutet, Karolinska Universitetssjukhuset Huddinge, 141 86, Stockholm, Sweden
| | - Arno Ruusalepp
- Clinical Gene Networks AB, Jungfrugatan 10, 114 44, Stockholm, Sweden.,Department of Immunology, Genetics and Pathology, Uppsala University, 751 85, Uppsala, Sweden
| | - Eric E Schadt
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,The Institute for Next Generation Healthcare, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,Clinical Gene Networks AB, Jungfrugatan 10, 114 44, Stockholm, Sweden.,Sema4, a Mount Sinai venture, Stamford, CT, 06902, USA
| | - Joel T Dudley
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,The Institute for Next Generation Healthcare, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,Department of Health Policy and Research, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Hongxia Ren
- Department of Pediatrics, Herman B Wells Center for Pediatric Research, Center for Diabetes and Metabolic Diseases, Stark Neurosciences Research Institute, Indiana University, 635 Barnhill Dr., MS2049, Indianapolis, IN, 46202, USA
| | - Jason C Kovacic
- Cardiovascular Research Center and Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Chiara Giannarelli
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA.,Cardiovascular Research Center and Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA
| | - Shuyu D Li
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA. .,Sema4, a Mount Sinai venture, Stamford, CT, 06902, USA.
| | - Johan L M Björkegren
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA. .,Department of Pathophysiology, Institute of Biomedicine and Translation Medicine, University of Tartu, Biomeedikum, Ravila 19, 50411, Tartu, Estonia. .,Clinical Gene Networks AB, Jungfrugatan 10, 114 44, Stockholm, Sweden. .,Integrated Cardio Metabolic Centre, Department of Medicine, Karolinska Institutet, Karolinska Universitetssjukhuset Huddinge, 141 86, Stockholm, Sweden.
| | - Rong Chen
- Department of Genetics and Genomic Sciences, The Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY, 10029, USA. .,Sema4, a Mount Sinai venture, Stamford, CT, 06902, USA.
| |
Collapse
|
40
|
van Rijn JM, van Hoesel M, de Heus C, van Vugt AHM, Klumperman J, Nieuwenhuis EES, Houwen RHJ, Middendorp S. DGAT2 partially compensates for lipid-induced ER stress in human DGAT1-deficient intestinal stem cells. J Lipid Res 2019; 60:1787-1800. [PMID: 31315900 DOI: 10.1194/jlr.m094201] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2019] [Revised: 07/17/2019] [Indexed: 12/16/2022] Open
Abstract
Dietary lipids are taken up as FAs by the intestinal epithelium and converted by diacylglycerol acyltransferase (DGAT) enzymes into triglycerides, which are packaged in chylomicrons or stored in cytoplasmic lipid droplets (LDs). DGAT1-deficient patients suffer from vomiting, diarrhea, and protein losing enteropathy, illustrating the importance of this process to intestinal homeostasis. Previously, we have shown that DGAT1 deficiency causes decreased LD formation and resistance to unsaturated FA lipotoxicity in patient-derived intestinal organoids. However, LD formation was not completely abolished in patient-derived organoids, suggesting the presence of an alternative mechanism for LD formation. Here, we show an unexpected role for DGAT2 in lipid metabolism, as DGAT2 partially compensates for LD formation and lipotoxicity in DGAT1-deficient intestinal stem cells. Furthermore, we show that (un)saturated FA-induced lipotoxicity is mediated by ER stress. More importantly, we demonstrate that overexpression of DGAT2 fully compensates for the loss of DGAT1 in organoids, indicating that induced DGAT2 expression in patient cells may serve as a therapeutic target in the future.
Collapse
Affiliation(s)
- Jorik M van Rijn
- Division of Pediatrics, Department of Pediatric Gastroenterology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands.,Regenerative Medicine Center, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Marliek van Hoesel
- Division of Pediatrics, Department of Pediatric Gastroenterology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands.,Regenerative Medicine Center, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Cecilia de Heus
- Department of Cell Biology, Center for Molecular Medicine, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Anke H M van Vugt
- Division of Pediatrics, Department of Pediatric Gastroenterology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands.,Regenerative Medicine Center, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Judith Klumperman
- Department of Cell Biology, Center for Molecular Medicine, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Edward E S Nieuwenhuis
- Division of Pediatrics, Department of Pediatric Gastroenterology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Roderick H J Houwen
- Division of Pediatrics, Department of Pediatric Gastroenterology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Sabine Middendorp
- Division of Pediatrics, Department of Pediatric Gastroenterology, Wilhelmina Children's Hospital, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands .,Regenerative Medicine Center, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| |
Collapse
|
41
|
Esler WP, Bence KK. Metabolic Targets in Nonalcoholic Fatty Liver Disease. Cell Mol Gastroenterol Hepatol 2019; 8:247-267. [PMID: 31004828 PMCID: PMC6698700 DOI: 10.1016/j.jcmgh.2019.04.007] [Citation(s) in RCA: 82] [Impact Index Per Article: 16.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 04/09/2019] [Accepted: 04/11/2019] [Indexed: 12/18/2022]
Abstract
The prevalence and diagnosis of nonalcoholic fatty liver disease (NAFLD) is on the rise worldwide and currently has no FDA-approved pharmacotherapy. The increase in disease burden of NAFLD and a more severe form of this progressive liver disease, nonalcoholic steatohepatitis (NASH), largely mirrors the increase in obesity and type 2 diabetes (T2D) and reflects the hepatic manifestation of an altered metabolic state. Indeed, metabolic syndrome, defined as a constellation of obesity, insulin resistance, hyperglycemia, dyslipidemia and hypertension, is the major risk factor predisposing the NAFLD and NASH. There are multiple potential pharmacologic strategies to rebalance aspects of disordered metabolism in NAFLD. These include therapies aimed at reducing hepatic steatosis by directly modulating lipid metabolism within the liver, inhibiting fructose metabolism, altering delivery of free fatty acids from the adipose to the liver by targeting insulin resistance and/or adipose metabolism, modulating glycemia, and altering pleiotropic metabolic pathways simultaneously. Emerging data from human genetics also supports a role for metabolic drivers in NAFLD and risk for progression to NASH. In this review, we highlight the prominent metabolic drivers of NAFLD pathogenesis and discuss the major metabolic targets of NASH pharmacotherapy.
Collapse
Key Words
- acc, acetyl-coa carboxylase
- alt, alanine aminotransferase
- aso, anti-sense oligonucleotide
- ast, aspartate aminotransferase
- chrebp, carbohydrate response element binding protein
- ci, confidence interval
- dgat, diacylglycerol o-acyltransferase
- dnl, de novo lipogenesis
- fas, fatty acid synthase
- ffa, free fatty acid
- fgf, fibroblast growth factor
- fxr, farnesoid x receptor
- glp-1, glucagon-like peptide-1
- hdl, high-density lipoprotein
- homa-ir, homeostatic model assessment of insulin resistance
- ldl, low-density lipoprotein
- nafld, nonalcoholic fatty liver disease
- nas, nonalcoholic fatty liver disease activity score
- nash, nonalcoholic steatohepatitis
- or, odds ratio
- pdff, proton density fat fraction
- ppar, peroxisome proliferator-activated receptor
- sglt2, sodium glucose co-transporter 2
- srebp-1c, sterol regulatory element binding protein-1c
- t2d, type 2 diabetes
- t2dm, type 2 diabetes mellitus
- tg, triglyceride
- th, thyroid hormone
- thr, thyroid hormone receptor
- treg, regulatory t cells
- tzd, thiazolidinedione
- vldl, very low-density lipoprotein
Collapse
Affiliation(s)
- William P Esler
- Internal Medicine Research Unit, Pfizer Worldwide Research, Development, and Medical, Cambridge, Massachusetts
| | - Kendra K Bence
- Internal Medicine Research Unit, Pfizer Worldwide Research, Development, and Medical, Cambridge, Massachusetts.
| |
Collapse
|
42
|
Okour M, Gress A, Zhu X, Rieman D, Lickliter JD, Brigandi RA. First-in-Human Pharmacokinetics and Safety Study of GSK3008356, a Selective DGAT1 Inhibitor, in Healthy Volunteers. Clin Pharmacol Drug Dev 2019; 8:1088-1099. [PMID: 30950565 DOI: 10.1002/cpdd.691] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Accepted: 03/19/2019] [Indexed: 11/10/2022]
Abstract
Diacylglycerol acyltransferase (DGAT) enzymes are involved in triglyceride (TG) biosynthesis. GSK3008356 is a potent and selective DGAT1 inhibitor that was administered orally in a 2-part study as double-blind, randomized, placebo-controlled single doses (SDs) and repeat doses (RDs) in healthy subjects to investigate its pharmacokinetics, pharmacodynamics, and safety/tolerability. Gastrointestinal adverse events were considered drug related and increased with dose and when given as multiple doses. In the SD part (n = 80), GSK3008356 was dosed from 5 to 200 mg as single or multiple doses per day. In the RD part (n = 24), GSK3008356 was dosed twice daily at 1, 3, and 10 mg for 14 days. GSK3008356 was generally well tolerated in the SD and RD parts. With single doses, absorption was rapid (median tmax , 0.5-1.5 hours), whereas single-day divided dosing resulted in higher tmax . Following 14-day RD oral administration, GSK3008356 was also rapidly absorbed, with median tmax ranging from 0.5 to 0.75 hours on days 1 and 14. Estimated mean half-life ranged from 1.5 to 4.6 hours with SDs and 1.3 to 2.1 hours with RDs. Exposure of GSK3008356 was largely dose proportional after RDs. At higher doses, there was a trend toward lower absolute postprandial TG level in some subjects.
Collapse
|
43
|
Morentin Gutierrez P, Yates J, Nilsson C, Birtles S. Evolving data analysis of an Oral Lipid Tolerance Test toward the standard for the Oral Glucose Tolerance Test: Cross species modeling effects of AZD7687 on plasma triacylglycerol. Pharmacol Res Perspect 2019; 7:e00465. [PMID: 30899516 PMCID: PMC6408865 DOI: 10.1002/prp2.465] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 12/03/2018] [Accepted: 12/28/2018] [Indexed: 12/28/2022] Open
Abstract
We have developed a novel mechanistic pharmacokinetic-pharmacodynamic (PK/PD) model to describe the time course of plasma triglyceride (TAG) after Oral Lipid Tolerance Test (OLTT) and the effects of AZD7687, an inhibitor of diacylglycerol acyltransferase 1 (DGAT1), in humans, rats, and mice. Pharmacokinetic and plasma TAG data were obtained both in animals and in two phase I OLTT studies. In the PK/PD model, the introduction of exogenous TAG is represented by a first order process. The endogenous production and removal of TAG from plasma are described with a turnover model. AZD7687 inhibits the contribution of exogenous TAG into circulation. One or two compartment models with first order absorption was used to describe the PK of AZD7687 for the different species. Nonlinear mixed effect modeling was used to fit the model to the data. The effects of AZD7687 on the plasma TAG time course during an OLTT as well as interindividual variability were well described by the model in all three species. Meal fat content or data from single vs repeated dosing did not affect model parameter estimates. Body mass index was found to be a significant covariate on the plasma TAG baseline. The system parameters of the model will facilitate analysis for other compounds and provide tools to bring the standard of OLTT data analysis closer to the analyses of Oral Glucose Tolerance Test data maximizing knowledge gain.
Collapse
Affiliation(s)
| | - James Yates
- AstraZeneca R&DIMEDDMPKChesterford Science ParkUK
| | | | | |
Collapse
|
44
|
Schlegel C, Lapierre LA, Weis VG, Williams JA, Kaji I, Pinzon-Guzman C, Prasad N, Boone B, Jones A, Correa H, Levy SE, Han X, Wang M, Thomsen K, Acra S, Goldenring JR. Reversible deficits in apical transporter trafficking associated with deficiency in diacylglycerol acyltransferase. Traffic 2018; 19:879-892. [PMID: 30095213 PMCID: PMC6191315 DOI: 10.1111/tra.12608] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Revised: 08/06/2018] [Accepted: 08/07/2018] [Indexed: 11/30/2022]
Abstract
Deficiency in diacylglycerol acyltransferase (DGAT1) is a rare cause of neonatal diarrhea, without a known mechanism or in vitro model. A patient presenting at our institution at 7 weeks of life with failure to thrive and diarrhea was found by whole-exome sequencing to have a homozygous DGAT1 truncation mutation. Duodenal biopsies showed loss of DGAT1 and deficits in apical membrane transporters and junctional proteins in enterocytes. When placed on a very low-fat diet, the patient's diarrhea resolved with normalization of brush border transporter localization in endoscopic biopsies. DGAT1 knockdown in Caco2-BBe cells modeled the deficits in apical trafficking, with loss of apical DPPIV and junctional occludin. Elevation in cellular lipid levels, including diacylglycerol (DAG) and phospholipid metabolites of DAG, was documented by lipid analysis in DGAT1 knockdown cells. Culture of the DGAT1 knockdown cells in lipid-depleted media led to re-establishment of occludin and return of apical DPPIV. DGAT1 loss appears to elicit global changes in enterocyte polarized trafficking that could account for deficits in absorption seen in the patient. The in vitro modeling of this disease should allow for investigation of possible therapeutic targets.
Collapse
Affiliation(s)
- Cameron Schlegel
- Department of Surgery and the Nashville VA Medical Center, Nashville, TN, USA
- Department of the Epithelial Biology Center and the Nashville VA Medical Center, Nashville, TN, USA
| | - Lynne A. Lapierre
- Department of Surgery and the Nashville VA Medical Center, Nashville, TN, USA
- Department of the Epithelial Biology Center and the Nashville VA Medical Center, Nashville, TN, USA
- Department of Vanderbilt University School of Medicine and the Nashville VA Medical Center, Nashville, TN, USA
| | - Victoria G. Weis
- Department of Surgery and the Nashville VA Medical Center, Nashville, TN, USA
- Department of the Epithelial Biology Center and the Nashville VA Medical Center, Nashville, TN, USA
| | - Janice A. Williams
- Department of Cell Imaging Share Resource and the Nashville VA Medical Center, Nashville, TN, USA
| | - Izumi Kaji
- Department of Surgery and the Nashville VA Medical Center, Nashville, TN, USA
- Department of the Epithelial Biology Center and the Nashville VA Medical Center, Nashville, TN, USA
| | - Carolina Pinzon-Guzman
- Department of Surgery and the Nashville VA Medical Center, Nashville, TN, USA
- Department of the Epithelial Biology Center and the Nashville VA Medical Center, Nashville, TN, USA
| | - Nripesh Prasad
- Department of Vanderbilt University School of Medicine and the Nashville VA Medical Center, Nashville, TN, USA
| | - Braden Boone
- HudsonAlpha Institute for Biotechnology, Huntsville, AL
| | - Angela Jones
- HudsonAlpha Institute for Biotechnology, Huntsville, AL
| | - Hernan Correa
- Department of Pathology, Microbiology and Immunology and the Nashville VA Medical Center, Nashville, TN, USA
| | - Shawn E. Levy
- HudsonAlpha Institute for Biotechnology, Huntsville, AL
| | - Xianlin Han
- Departments of Medicine & Biochemistry, Barshop Institute for Longevity and Aging Studies, University of Texas Health, San Antonio, TX, USA
| | - Miao Wang
- Departments of Medicine & Biochemistry, Barshop Institute for Longevity and Aging Studies, University of Texas Health, San Antonio, TX, USA
| | - Kelly Thomsen
- Division of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, and the Nashville VA Medical Center, Nashville, TN, USA
| | - Sari Acra
- Division of Pediatric Gastroenterology, Hepatology and Nutrition, Department of Pediatrics, and the Nashville VA Medical Center, Nashville, TN, USA
| | - James R. Goldenring
- Department of Surgery and the Nashville VA Medical Center, Nashville, TN, USA
- Department of Cell & Developmental Biology and the Nashville VA Medical Center, Nashville, TN, USA
- Department of the Epithelial Biology Center and the Nashville VA Medical Center, Nashville, TN, USA
- Department of Vanderbilt University School of Medicine and the Nashville VA Medical Center, Nashville, TN, USA
| |
Collapse
|
45
|
Bhatt-Wessel B, Jordan TW, Miller JH, Peng L. Role of DGAT enzymes in triacylglycerol metabolism. Arch Biochem Biophys 2018; 655:1-11. [PMID: 30077544 DOI: 10.1016/j.abb.2018.08.001] [Citation(s) in RCA: 107] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 07/25/2018] [Accepted: 08/02/2018] [Indexed: 01/22/2023]
Abstract
The esterification of a fatty acyl moiety to diacylglycerol to form triacylglycerol (TAG) is catalysed by two diacylglycerol O-acyltransferases (DGATs) encoded by genes belonging to two distinct gene families. The enzymes are referred to as DGAT1 and DGAT2 in order of their identification. Both proteins are transmembrane proteins localized in the endoplasmic reticulum. Their membrane topologies are however significantly different. This difference is hypothesized to give the two isozymes different abilities to interact with other proteins and organelles and access to different pools of fatty acids, thereby creating a distinction between the enzymes in terms of their role and contribution to lipid metabolism. DGAT1 is proposed to have dual topology contributing to TAG synthesis on both sides of the ER membrane and esterifying only the pre-formed fatty acids. There is evidence to suggest that DGAT2 translocates to the lipid droplet (LD), associates with other proteins, and synthesizes cytosolic and luminal apolipoprotein B associated LD-TAG from both endogenous and exogenous fatty acids. The aim of this review is to differentiate between the two DGAT enzymes by comparing the genes that encode them, their proposed topologies, the proteins they interact with, and their roles in lipid metabolism.
Collapse
Affiliation(s)
- Bhumika Bhatt-Wessel
- Centre for Biodiscovery and School of Biological Sciences, Victoria University of Wellington, New Zealand
| | - T William Jordan
- Centre for Biodiscovery and School of Biological Sciences, Victoria University of Wellington, New Zealand
| | - John H Miller
- Centre for Biodiscovery and School of Biological Sciences, Victoria University of Wellington, New Zealand
| | - Lifeng Peng
- Centre for Biodiscovery and School of Biological Sciences, Victoria University of Wellington, New Zealand.
| |
Collapse
|
46
|
McLaren DG, Han S, Murphy BA, Wilsie L, Stout SJ, Zhou H, Roddy TP, Gorski JN, Metzger DE, Shin MK, Reilly DF, Zhou HH, Tadin-Strapps M, Bartz SR, Cumiskey AM, Graham TH, Shen DM, Akinsanya KO, Previs SF, Imbriglio JE, Pinto S. DGAT2 Inhibition Alters Aspects of Triglyceride Metabolism in Rodents but Not in Non-human Primates. Cell Metab 2018; 27:1236-1248.e6. [PMID: 29706567 DOI: 10.1016/j.cmet.2018.04.004] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/12/2017] [Revised: 01/12/2018] [Accepted: 04/02/2018] [Indexed: 11/18/2022]
Abstract
Diacylglycerol acyltransferase 2 (DGAT2) catalyzes the final step in triglyceride (TG) synthesis and has been shown to play a role in regulating hepatic very-low-density lipoprotein (VLDL) production in rodents. To explore the potential of DGAT2 as a therapeutic target for the treatment of dyslipidemia, we tested the effects of small-molecule inhibitors and gene silencing both in vitro and in vivo. Consistent with prior reports, chronic inhibition of DGAT2 in a murine model of obesity led to correction of multiple lipid parameters. In contrast, experiments in primary human, rhesus, and cynomolgus hepatocytes demonstrated that selective inhibition of DGAT2 has only a modest effect. Acute and chronic inhibition of DGAT2 in rhesus primates recapitulated the in vitro data yielding no significant effects on production of plasma TG or VLDL apolipoprotein B. These results call into question whether selective inhibition of DGAT2 is sufficient for remediation of dyslipidemia.
Collapse
Affiliation(s)
| | - Seongah Han
- Division of Cardio Metabolic Disease, Merck & Co., Inc., Kenilworth, NJ 07033, USA.
| | | | - Larissa Wilsie
- Division of Cardio Metabolic Disease, Merck & Co., Inc., Kenilworth, NJ 07033, USA
| | - Steven J Stout
- Pharmacology, Merck & Co., Inc., Kenilworth, NJ 07033, USA
| | - Haihong Zhou
- Division of Cardio Metabolic Disease, Merck & Co., Inc., Kenilworth, NJ 07033, USA
| | - Thomas P Roddy
- Division of Cardio Metabolic Disease, Merck & Co., Inc., Kenilworth, NJ 07033, USA
| | | | | | - Myung K Shin
- Genetics and Pharmacogenomics, Merck & Co., Inc., Boston, MA 02115, USA
| | - Dermot F Reilly
- Genetics and Pharmacogenomics, Merck & Co., Inc., Boston, MA 02115, USA
| | - Heather H Zhou
- Division of Cardio Metabolic Disease, Merck & Co., Inc., Kenilworth, NJ 07033, USA
| | | | - Steven R Bartz
- Business Development and Licensing, Merck & Co., Inc., Kenilworth, NJ 07033, USA
| | | | - Thomas H Graham
- Discovery Chemistry, Merck & Co., Inc., Kenilworth, NJ 07033, USA
| | - Dong-Ming Shen
- Discovery Chemistry, Merck & Co., Inc., Kenilworth, NJ 07033, USA
| | - Karen O Akinsanya
- Business Development and Licensing, Merck & Co., Inc., Kenilworth, NJ 07033, USA
| | - Stephen F Previs
- Division of Cardio Metabolic Disease, Merck & Co., Inc., Kenilworth, NJ 07033, USA
| | | | - Shirly Pinto
- Division of Cardio Metabolic Disease, Merck & Co., Inc., Kenilworth, NJ 07033, USA.
| |
Collapse
|
47
|
Gallo-Ebert C, Francisco J, Liu HY, Draper R, Modi K, Hayward MD, Jones BK, Buiakova O, McDonough V, Nickels JT. Mice lacking ARV1 have reduced signs of metabolic syndrome and non-alcoholic fatty liver disease. J Biol Chem 2018; 293:5956-5974. [PMID: 29491146 DOI: 10.1074/jbc.ra117.000800] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2017] [Revised: 02/27/2018] [Indexed: 12/13/2022] Open
Abstract
Metabolic syndrome (MetS) is a term used to characterize individuals having at least three of the following diseases: obesity, dyslipidemia, hyperglycemia, insulin resistance, hypertension, and nonalcoholic fatty liver disease (NAFLD). It is widespread, and the number of individuals with MetS is increasing. However, the events leading to the manifestation of MetS are not well-understood. Here, we show that loss of murine ARV1 (mARV1) results in resistance to acquiring diseases associated with MetS. Arv1-/- animals fed a high-fat diet were resistant to diet-induced obesity, had lower blood cholesterol and triglyceride levels, and retained glucose tolerance and insulin sensitivity. Livers showed no gross morphological changes, contained lower levels of cholesterol, triglycerides, and fatty acids, and showed fewer signs of NAFLD. Knockout animals had elevated levels of liver farnesol X receptor (FXR) protein and its target, small heterodimer protein (SHP). They also had decreased levels of CYP7α1, CYP8β1, and mature SREBP1 protein, evidence suggesting that liver FXR signaling was activated. Strengthening this hypothesis was the fact that peroxisome proliferator-activating receptor α (PPARα) protein was elevated, along with its target, fibroblast growth factor 21 (FGF21). Arv1-/- animals excreted more fecal cholesterol, free fatty acids, and bile acids. Their small intestines had 1) changes in bile acid composition, 2) an increase in the level of the intestinal FXR antagonist, tauromuricholic acid, and 3) showed signs of attenuated FXR signaling. Overall, we believe that ARV1 function is deleterious when consuming a high-fat diet. We further hypothesize that ARV1 is critical for initiating events required for the progression of diseases associated with MetS and NAFLD.
Collapse
Affiliation(s)
- Christina Gallo-Ebert
- From the Institute of Metabolic Disorders, Genesis Biotechnology Group, Hamilton, New Jersey 08691
| | - Jamie Francisco
- From the Institute of Metabolic Disorders, Genesis Biotechnology Group, Hamilton, New Jersey 08691
| | - Hsing-Yin Liu
- From the Institute of Metabolic Disorders, Genesis Biotechnology Group, Hamilton, New Jersey 08691
| | | | - Kinnari Modi
- From the Institute of Metabolic Disorders, Genesis Biotechnology Group, Hamilton, New Jersey 08691
| | - Michael D Hayward
- Invivotek, Genesis Biotechnology Group, Hamilton, New Jersey 08691, and
| | - Beverly K Jones
- Invivotek, Genesis Biotechnology Group, Hamilton, New Jersey 08691, and
| | - Olesia Buiakova
- Invivotek, Genesis Biotechnology Group, Hamilton, New Jersey 08691, and
| | | | - Joseph T Nickels
- From the Institute of Metabolic Disorders, Genesis Biotechnology Group, Hamilton, New Jersey 08691, .,the Rutgers Center for Lipid Research, New Jersey Institute for Food, Nutrition, and Health, Rutgers University, New Brunswick, New Jersey 08901
| |
Collapse
|
48
|
Cheung M, Tangirala RS, Bethi SR, Joshi HV, Ariazi JL, Tirunagaru VG, Kumar S. Discovery of Tetralones as Potent and Selective Inhibitors of Acyl-CoA:Diacylglycerol Acyltransferase 1. ACS Med Chem Lett 2018; 9:103-108. [PMID: 29456796 DOI: 10.1021/acsmedchemlett.7b00450] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2017] [Accepted: 01/16/2018] [Indexed: 02/05/2023] Open
Abstract
Acyl-CoA:diacylglycerol acyltransferase 1 (DGAT1) plays an important role in triglyceride synthesis and is a target of interest for the treatment of metabolic disorders. Herein we describe the structure-activity relationship of a novel tetralone series of DGAT1 inhibitors and our strategies for overcoming genotoxic liability of the anilines embedded in the chemical structures, leading to the discovery of a candidate compound, (S)-2-(6-(5-(3-(3,4-difluorophenyl)ureido)pyrazin-2-yl)-1-oxo-2-(2,2,2-trifluoroethyl)-1,2,3,4-tetrahydronaphthalen-2-yl)acetic acid (GSK2973980A, 26d). Compound 26d is a potent and selective DGAT1 inhibitor with excellent DMPK profiles and in vivo efficacy in a postprandial lipid excursion model in mice. Based on the overall biological and developability profiles and acceptable safety profiles in the 7-day toxicity studies in rats and dogs, compound 26d was selected as a candidate compound for further development in the treatment of metabolic disorders.
Collapse
Affiliation(s)
- Mui Cheung
- Virtual
Proof of Concept Discovery Performance Unit, Alternative Discovery
and Development, GlaxoSmithKline, 709 Swedeland Road, King of Prussia, Pennsylvania 19406, United States
| | - Raghuram S. Tangirala
- Collaborative
Research, GVK Biosciences Private Limited, 28A, IDA, Nacharam, Hyderabad 500076, India
| | - Sridhar R. Bethi
- Collaborative
Research, GVK Biosciences Private Limited, 28A, IDA, Nacharam, Hyderabad 500076, India
| | - Hemant V. Joshi
- Collaborative
Research, GVK Biosciences Private Limited, 28A, IDA, Nacharam, Hyderabad 500076, India
| | - Jennifer L. Ariazi
- Virtual
Proof of Concept Discovery Performance Unit, Alternative Discovery
and Development, GlaxoSmithKline, 709 Swedeland Road, King of Prussia, Pennsylvania 19406, United States
| | - Vijaya G. Tirunagaru
- Collaborative
Research, GVK Biosciences Private Limited, 28A, IDA, Nacharam, Hyderabad 500076, India
| | - Sanjay Kumar
- Virtual
Proof of Concept Discovery Performance Unit, Alternative Discovery
and Development, GlaxoSmithKline, 709 Swedeland Road, King of Prussia, Pennsylvania 19406, United States
| |
Collapse
|
49
|
Abstract
PURPOSE OF REVIEW Although lipid-lowering treatment with statins, ezetimibe, and PCSK9 inhibitors is a very successful strategy to prevent cardiovascular events, there is a need for further drug developments. Not all patients respond sufficiently to the available therapy (very high baseline values, intolerance). Furthermore, patients may be characterized by dyslipidemias not accessible to available drugs such as patients with homozygous familial hypercholesterolemia, chylomicronemia syndrome, or elevated lipoprotein(a). A number of drugs are being developed to close these gaps. RECENT FINDINGS The focus is on new antibodies, antisense oligonucleotides, and small molecules that address different aspects of lipid metabolism. Many of these developments are promising as they decrease LDL-cholesterol and/or non-HDL-cholesterol and/or triglycerides and/or lipoprotein(a) in patients who so far cannot be treated sufficiently. These drugs are currently in different stages of development and being tested in clinical trials. SUMMARY Some of the new lipid-lowering drugs have a very promising profile. However, eventually phase 3 and outcome trials will be required to prove the usefulness of these compounds in clinical practice. Furthermore, it is unlikely that they will change the primary lipidological approach (statin and ezetimibe) even if they prove successful.
Collapse
Affiliation(s)
- Klaus G Parhofer
- Medizinische Klinik IV - Grosshadern, University Munich, Munich, Germany
| |
Collapse
|
50
|
Boehm M, Crawford M, Moscovitz JE, Carpino PA. Diabetes area patent participation analysis – part II: years 2011-2016. Expert Opin Ther Pat 2017; 28:111-122. [DOI: 10.1080/13543776.2018.1406477] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Markus Boehm
- Department of Medicinal Sciences, Worldwide Research and Development, Pfizer, Inc., Cambridge, MA, USA
| | - Matthew Crawford
- Department of Medicinal Sciences, Worldwide Research and Development, Pfizer, Inc., Cambridge, MA, USA
| | - Jamie E. Moscovitz
- Department of Medicinal Sciences, Worldwide Research and Development, Pfizer, Inc., Cambridge, MA, USA
| | - Philip A. Carpino
- Department of Medicinal Sciences, Worldwide Research and Development, Pfizer, Inc., Cambridge, MA, USA
| |
Collapse
|