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Kong L, Zhao Q, Jiang X, Hu J, Jiang Q, Sheng L, Peng X, Wang S, Chen Y, Wan Y, Hou S, Liu X, Ma C, Li Y, Quan L, Chen L, Cui B, Li P. Trimethylamine N-oxide impairs β-cell function and glucose tolerance. Nat Commun 2024; 15:2526. [PMID: 38514666 PMCID: PMC10957989 DOI: 10.1038/s41467-024-46829-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 03/12/2024] [Indexed: 03/23/2024] Open
Abstract
β-Cell dysfunction and β-cell loss are hallmarks of type 2 diabetes (T2D). Here, we found that trimethylamine N-oxide (TMAO) at a similar concentration to that found in diabetes could directly decrease glucose-stimulated insulin secretion (GSIS) in MIN6 cells and primary islets from mice or humans. Elevation of TMAO levels impairs GSIS, β-cell proportion, and glucose tolerance in male C57BL/6 J mice. TMAO inhibits calcium transients through NLRP3 inflammasome-related cytokines and induced Serca2 loss, and a Serca2 agonist reversed the effect of TMAO on β-cell function in vitro and in vivo. Additionally, long-term TMAO exposure promotes β-cell ER stress, dedifferentiation, and apoptosis and inhibits β-cell transcriptional identity. Inhibition of TMAO production improves β-cell GSIS, β-cell proportion, and glucose tolerance in both male db/db and choline diet-fed mice. These observations identify a role for TMAO in β-cell dysfunction and maintenance, and inhibition of TMAO could be an approach for the treatment of T2D.
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Affiliation(s)
- Lijuan Kong
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Diabetes Research Center of Chinese Academy of Medical Sciences, Beijing, China
- CAMS Key Laboratory of Molecular Mechanism and Target Discovery of Metabolic Disorder and Tumorigenesis, Beijing, China
| | - Qijin Zhao
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Diabetes Research Center of Chinese Academy of Medical Sciences, Beijing, China
- CAMS Key Laboratory of Molecular Mechanism and Target Discovery of Metabolic Disorder and Tumorigenesis, Beijing, China
| | - Xiaojing Jiang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Diabetes Research Center of Chinese Academy of Medical Sciences, Beijing, China
- CAMS Key Laboratory of Molecular Mechanism and Target Discovery of Metabolic Disorder and Tumorigenesis, Beijing, China
| | - Jinping Hu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Qian Jiang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Diabetes Research Center of Chinese Academy of Medical Sciences, Beijing, China
- CAMS Key Laboratory of Molecular Mechanism and Target Discovery of Metabolic Disorder and Tumorigenesis, Beijing, China
| | - Li Sheng
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Xiaohong Peng
- College of Future Technology, Institute of Molecular Medicine, National Biomedical Imaging Center, Peking University, 100871, Beijing, China
- Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Peking University, 100871, Beijing, China
| | - Shusen Wang
- Tianjin First Central Hospital, Tianjin, China
| | - Yibing Chen
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Diabetes Research Center of Chinese Academy of Medical Sciences, Beijing, China
- CAMS Key Laboratory of Molecular Mechanism and Target Discovery of Metabolic Disorder and Tumorigenesis, Beijing, China
| | - Yanjun Wan
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Diabetes Research Center of Chinese Academy of Medical Sciences, Beijing, China
- CAMS Key Laboratory of Molecular Mechanism and Target Discovery of Metabolic Disorder and Tumorigenesis, Beijing, China
| | - Shaocong Hou
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Diabetes Research Center of Chinese Academy of Medical Sciences, Beijing, China
- CAMS Key Laboratory of Molecular Mechanism and Target Discovery of Metabolic Disorder and Tumorigenesis, Beijing, China
| | - Xingfeng Liu
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Diabetes Research Center of Chinese Academy of Medical Sciences, Beijing, China
- CAMS Key Laboratory of Molecular Mechanism and Target Discovery of Metabolic Disorder and Tumorigenesis, Beijing, China
| | - Chunxiao Ma
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- Diabetes Research Center of Chinese Academy of Medical Sciences, Beijing, China
- CAMS Key Laboratory of Molecular Mechanism and Target Discovery of Metabolic Disorder and Tumorigenesis, Beijing, China
| | - Yan Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
| | - Li Quan
- Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Peking University, 100871, Beijing, China
| | - Liangyi Chen
- College of Future Technology, Institute of Molecular Medicine, National Biomedical Imaging Center, Peking University, 100871, Beijing, China
- Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Peking University, 100871, Beijing, China
| | - Bing Cui
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China
- CAMS Key Laboratory of Molecular Mechanism and Target Discovery of Metabolic Disorder and Tumorigenesis, Beijing, China
| | - Pingping Li
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
- Diabetes Research Center of Chinese Academy of Medical Sciences, Beijing, China.
- CAMS Key Laboratory of Molecular Mechanism and Target Discovery of Metabolic Disorder and Tumorigenesis, Beijing, China.
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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] [What about the content of this article? (0)] [Affiliation(s)] [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.
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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
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Memon B, Abdelalim EM. ACE2 function in the pancreatic islet: Implications for relationship between SARS-CoV-2 and diabetes. Acta Physiol (Oxf) 2021; 233:e13733. [PMID: 34561952 PMCID: PMC8646749 DOI: 10.1111/apha.13733] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 09/15/2021] [Accepted: 09/20/2021] [Indexed: 01/08/2023]
Abstract
The molecular link between SARS-CoV-2 infection and susceptibility is not well understood. Nonetheless, a bi-directional relationship between SARS-CoV-2 and diabetes has been proposed. The angiotensin-converting enzyme 2 (ACE2) is considered as the primary protein facilitating SARS-CoV and SARS-CoV-2 attachment and entry into the host cells. Studies suggested that ACE2 is expressed in the endocrine cells of the pancreas including beta cells, in addition to the lungs and other organs; however, its expression in the islets, particularly beta cells, has been met with some contradiction. Importantly, ACE2 plays a crucial role in glucose homoeostasis and insulin secretion by regulating beta cell physiology. Given the ability of SARS-CoV-2 to infect human pluripotent stem cell-derived pancreatic cells in vitro and the presence of SARS-CoV-2 in pancreatic samples from COVID-19 patients strongly hints that SARS-CoV-2 can invade the pancreas and directly cause pancreatic injury and diabetes. However, more studies are required to dissect the underpinning molecular mechanisms triggered in SARS-CoV-2-infected islets that lead to aggravation of diabetes. Regardless, it is important to understand the function of ACE2 in the pancreatic islets to design relevant therapeutic interventions in combatting the effects of SARS-CoV-2 on diabetes pathophysiology. Herein, we detail the function of ACE2 in pancreatic beta cells crucial for regulating insulin sensitivity, secretion, and glucose metabolism. Also, we discuss the potential role played by ACE2 in aiding SARS-COV-2 entry into the pancreas and the possibility of ACE2 cooperation with alternative entry factors as well as how that may be linked to diabetes pathogenesis.
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Affiliation(s)
- Bushra Memon
- College of Health and Life Sciences Hamad Bin Khalifa University (HBKU)Qatar Foundation Doha Qatar
- Diabetes Research Center Qatar Biomedical Research Institute (QBRI)Hamad Bin KhalifaUniversity (HBKU)Qatar Foundation (QF) Doha Qatar
| | - Essam M. Abdelalim
- College of Health and Life Sciences Hamad Bin Khalifa University (HBKU)Qatar Foundation Doha Qatar
- Diabetes Research Center Qatar Biomedical Research Institute (QBRI)Hamad Bin KhalifaUniversity (HBKU)Qatar Foundation (QF) Doha Qatar
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Madec AM, Perrier J, Panthu B, Dingreville F. Role of mitochondria-associated endoplasmic reticulum membrane (MAMs) interactions and calcium exchange in the development of type 2 diabetes. Int Rev Cell Mol Biol 2021; 363:169-202. [PMID: 34392929 DOI: 10.1016/bs.ircmb.2021.06.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Glucotoxicity-induced β-cell dysfunction in type 2 diabetes is associated with alterations of mitochondria and the endoplasmic reticulum (ER). Mitochondria and ER form a network in cells that controls cell function and fate. Mitochondria of the pancreatic β cell play a central role in the secretion of insulin in response to glucose through their ability to produce ATP. Both organelles interact at contact sites, defined as mitochondria-associated membranes (MAMs), which were recently implicated in the regulation of glucose homeostasis. Here, we review MAM functions in the cell and we focus on the crosstalk between the ER and Mitochondria in the context of T2D, highlighting the pivotal role played by MAMs especially in β cells through inter-organelle calcium exchange and glucotoxicity-associated β cell dysfunction.
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Affiliation(s)
| | - Johan Perrier
- CarMeN Laboratory, INSERM U1060, INRA U1397, Lyon, France
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Abstract
The impairment of pancreatic β-cells function is partly caused by lipotoxicity, which aggravates the development of type 2 diabetes mellitus. Activator Protein 1 member JunD modulates apoptosis and oxidative stress. Recently, it has been found that JunD regulates lipid metabolism in hepatocytes and cardiomyocytes. Here, we studied the role of JunD in pancreatic β-cells. The lipotoxic effects of palmitic acid on INS-1 cells were measured, and JunD small-interfering RNA was used to assess the effect of JunD in regulating lipid metabolism and insulin secretion. The results showed that palmitic acid stimulation induced the overexpression of JunD, impaired glucose-stimulated insulin secretion, and increased intracellular lipid accumulation of β-cells. Moreover, the gene expression involved in lipid metabolism (Scd1, Fabp4, Fas, Cd36, Lpl, and Plin5) was upregulated, while gene expression involved in the pancreatic β-cells function (such as Pdx1, Nkx6.1, Glut2, and Irs-2) was decreased. Gene silencing of JunD reversed the lipotoxic effects induced by PA on β-cells. These results suggested that JunD regulated the function of pancreatic β-cells by altering lipid accumulation.
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Affiliation(s)
- Kexin Wang
- Department of General Surgery, Qilu Hospital of Shandong University, Jinan, China
| | - Yixin Cui
- Department of Endocrinology, Qilu Hospital of Shandong University, Shandong University, Jinan, China
- Institute of Endocrine and Metabolic Diseases of Shandong University, Jinan, China
| | - Peng Lin
- Department of Endocrinology, Qilu Hospital of Shandong University, Shandong University, Jinan, China
- Institute of Endocrine and Metabolic Diseases of Shandong University, Jinan, China
| | - Zhina Yao
- Center for Reproductive Medicine, Cheeloo College of Medicine, Shandong University, Jinan, China
- *Correspondence: Zhina Yao, ; Yu Sun,
| | - Yu Sun
- Department of Endocrinology, Qilu Hospital of Shandong University, Shandong University, Jinan, China
- Institute of Endocrine and Metabolic Diseases of Shandong University, Jinan, China
- *Correspondence: Zhina Yao, ; Yu Sun,
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Ramalingam L, Sopontammarak B, Menikdiwela KR, Moustaid-Moussa N. Endoplasmic Reticulum (ER) Stress in Part Mediates Effects of Angiotensin II in Pancreatic Beta Cells. Diabetes Metab Syndr Obes 2020; 13:2843-2853. [PMID: 32884312 PMCID: PMC7443445 DOI: 10.2147/dmso.s257797] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 06/24/2020] [Indexed: 12/22/2022] Open
Abstract
INTRODUCTION The renin angiotensin aldosterone system (RAAS) is a hormone system known for its role in regulating blood pressure and fluid balance. Numerous RAAS inhibitors routinely prescribed for hypertension have also beneficial effects in type 2 diabetes (T2D) prevention. RAAS components are expressed locally in many tissues, including adipose tissue and pancreas, where they exert metabolic effects through RAAS bioactive hormone angiotensin II (Ang II). Pancreatic beta cells are specialized insulin-producing cells; they have also developed endoplasmic reticulum (ER), which contributes to beta cell dysfunction, when proteins are misfolded in disease states such as T2D. However, no studies have investigated the relationship between RAAS and ER stress in beta cells as a mechanism linking pancreatic RAAS to T2D. Hence, we hypothesized that Ang II treatment of beta cells increases ER stress and inflammation leading to reduced insulin secretion. METHODS To test this hypothesis, we treated clonal INS-1E beta cells and human islets with Ang II and assessed changes in ER stress markers. INS-1E beta cells were also used for measuring insulin secretion and for assessing the effects of various RAAS and ER stress inhibitors. RESULTS We demonstrated that Ang II significantly increased the expression of ER stress genes such as Chop and Atf4 and reduced insulin secretion. Furthermore, inhibition of Ang II production with an angiotensin converting enzyme inhibitor (ACEi, captopril) significantly reduced ER stress. Moreover, the Ang II receptor blockade reduced ER stress significantly and rescued insulin secretion. DISCUSSION This research provides new mechanistic insight into the role of RAAS activation via ER stress on beta cell dysfunction and provides additional evidence for protective effects of RAAS inhibition in T2D.
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Affiliation(s)
- Latha Ramalingam
- Department of Nutritional Sciences, And Obesity Research Institute, Texas Tech University, Lubbock, TX79424, USA
| | - Boontharick Sopontammarak
- Department of Nutritional Sciences, And Obesity Research Institute, Texas Tech University, Lubbock, TX79424, USA
| | - Kalhara R Menikdiwela
- Department of Nutritional Sciences, And Obesity Research Institute, Texas Tech University, Lubbock, TX79424, USA
| | - Naima Moustaid-Moussa
- Department of Nutritional Sciences, And Obesity Research Institute, Texas Tech University, Lubbock, TX79424, USA
- Correspondence: Naima Moustaid-Moussa Texas Tech University, Department of Nutritional Sciences & Obesity Research Institute, 1301 Akron Street, Lubbock, TX79409-1270, USATel + 806-834-7946 Email
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Dingreville F, Panthu B, Thivolet C, Ducreux S, Gouriou Y, Pesenti S, Chauvin MA, Chikh K, Errazuriz-Cerda E, Van Coppenolle F, Rieusset J, Madec AM. Differential Effect of Glucose on ER-Mitochondria Ca 2+ Exchange Participates in Insulin Secretion and Glucotoxicity-Mediated Dysfunction of β-Cells. Diabetes 2019; 68:1778-1794. [PMID: 31175102 DOI: 10.2337/db18-1112] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Accepted: 06/04/2019] [Indexed: 11/13/2022]
Abstract
Glucotoxicity-induced β-cell dysfunction in type 2 diabetes is associated with alterations of mitochondria and the endoplasmic reticulum (ER). Both organelles interact at contact sites, defined as mitochondria-associated membranes (MAMs), which were recently implicated in the regulation of glucose homeostasis. The role of MAMs in β-cells is still largely unknown, and their implication in glucotoxicity-associated β-cell dysfunction remains to be defined. Here, we report that acute glucose treatment stimulated ER-mitochondria interactions and calcium (Ca2+) exchange in INS-1E cells, whereas disruption of MAMs altered glucose-stimulated insulin secretion (GSIS). Conversely, chronic incubations with high glucose of either INS-1E cells or human pancreatic islets altered GSIS and concomitantly reduced ER Ca2+ store, increased basal mitochondrial Ca2+, and reduced ATP-stimulated ER-mitochondria Ca2+ exchanges, despite an increase of organelle interactions. Furthermore, glucotoxicity-induced perturbations of Ca2+ signaling are associated with ER stress, altered mitochondrial respiration, and mitochondria fragmentation, and these organelle stresses may participate in increased organelle tethering as a protective mechanism. Last, sustained induction of ER-mitochondria interactions using a linker reduced organelle Ca2+ exchange, induced mitochondrial fission, and altered GSIS. Therefore, dynamic organelle coupling participates in GSIS in β-cells, and over time, disruption of organelle Ca2+ exchange might be a novel mechanism contributing to glucotoxicity-induced β-cell dysfunction.
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Affiliation(s)
- Florian Dingreville
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Baptiste Panthu
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Charles Thivolet
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
- Department of Endocrinology and Diabetes, Hospices Civils de Lyon, Hopital Lyon Sud, Pierre-Bénite, France
| | - Sylvie Ducreux
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Yves Gouriou
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Sandra Pesenti
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Marie-Agnès Chauvin
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Karim Chikh
- Department of Endocrinology and Diabetes, Hospices Civils de Lyon, Hopital Lyon Sud, Pierre-Bénite, France
| | | | - Fabien Van Coppenolle
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Jennifer Rieusset
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
| | - Anne-Marie Madec
- CarMeN Laboratory, INSERM, INRA, INSA, Université Claude Bernard Lyon 1, Oullins, France
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Hwang HJ, Jang HJ, Cocco L, Suh PG. The regulation of insulin secretion via phosphoinositide-specific phospholipase Cβ signaling. Adv Biol Regul 2019; 71:10-18. [PMID: 30293894 DOI: 10.1016/j.jbior.2018.09.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Revised: 09/17/2018] [Accepted: 09/17/2018] [Indexed: 06/08/2023]
Abstract
Phospholipase Cβ (PLCβ) is a membrane-associated enzyme activated by membrane receptors, especially G-protein coupled receptors (GPCRs). It propagates intracellular signaling by mediating phospholipid metabolism and generating key second messengers, such as inositol triphosphate and diacylglycerol, leading to intracellular Ca2+ mobilization and activation of kinases, such as protein kinases C. In pancreatic β-cells, PLCβ-mediated signaling activated by various factors, such as free fatty acids and neuronal and hormonal ligands, has been confirmed as being involved in the regulation of insulin secretion, and PLCβs have been regarded as essential mediators for augmenting insulin secretion. In this review, we describe the physiological function of PLCβs in the regulation of glucose-stimulated insulin secretion and discuss emerging data on GPCR/PLCβ signaling that is being developed as a target for the treatment of diabetes mellitus.
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Affiliation(s)
- Hyeon-Jeong Hwang
- School of Life Sciences, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
| | - Hyun-Jun Jang
- School of Life Sciences, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
| | - Lucio Cocco
- Cellular Signaling Laboratory, Department of Biomedical Sciences, University of Bologna, Via Irnerio, 48, I-40126, Bologna, Italy
| | - Pann-Ghill Suh
- School of Life Sciences, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea.
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Xuan X, Gao F, Ma X, Huang C, Wang Y, Deng H, Wang S, Li W, Yuan L. Activation of ACE2/angiotensin (1-7) attenuates pancreatic β cell dedifferentiation in a high-fat-diet mouse model. Metabolism 2018; 81:83-96. [PMID: 29225087 DOI: 10.1016/j.metabol.2017.12.003] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2017] [Revised: 11/14/2017] [Accepted: 12/03/2017] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Angiotensin-converting enzyme 2 (ACE2) has been identified in pancreatic islets and can preserve β cells. In this study, we aimed to examine the possible role of ACE2 and its end product, angiotensin 1-7 (A1-7), in reducing β cell dedifferentiation during metabolic stress. METHODS First, a lineage-tracing experiment was performed to track β cells in mice fed a high-fat diet (HFD). Second, the ACE2/A1-7 axis was evaluated in the HFD mouse model. Intraperitoneal glucose tolerance tests (IPGTTs) and intraperitoneal insulin tolerance tests (IPITTs) were conducted. Phenotypic changes in β cells were detected by immunohistochemistry and quantitative real-time PCR. Pancreatic sections were immunostained for vascular endothelial growth factor (VEGF) and inducible nitric oxide synthase (iNOS). Finally, the effects of the ACE2/A1-7 axis were explored in isolated mouse islets exposed to different concentrations of glucose. Glucose-stimulated insulin release and levels of insulin mRNA and OCT4 mRNA were measured. RESULTS Pancreatic β cell dedifferentiation occurred both in vitro and in vivo in response to metabolic stress and was accompanied by ACE2 reduction. HFD-induced insulin resistance and glucose intolerance were exacerbated in ACE2-knockout (ACE2KO) mice but were alleviated by exogenous A1-7 in C57BL/6J mice. Approximately 20% of β cells were dedifferentiated in ACE2KO mice fed a standard rodent chow diet (SD). A higher percentage of dedifferentiated β cells was detected in ACE2KO mice than in wild-type (WT) mice under HFD conditions. In contrast, the administration of A1-7 alleviated HFD-induced β cell dedifferentiation in C57BL/6J mice. Moreover, the exogenous injection of A1-7 improved microcirculation in islets and decreased the production of iNOS in islets of C57BL/6J mice fed an HFD. Additionally, ACE2 was found to be mainly expressed in α cells of mice, while Mas, the receptor of A1-7, was distributed in β cells. CONCLUSIONS Overall, this study is the first to demonstrate that the ACE2/A1-7/Mas axis may be one of the intra-islet paracrine mechanisms of communication between α and β cells. Enhancing the ACE2/A1-7 axis exerts a protective effect by ameliorating β cell dedifferentiation, and this effect might be partially mediated through improvements in islet microcirculation and suppression of islet iNOS.
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Affiliation(s)
- Xiuping Xuan
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Fei Gao
- Department of Orthopedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Xiaoyi Ma
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Chenghu Huang
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Ying Wang
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Hongjun Deng
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Shiqi Wang
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Wencun Li
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Li Yuan
- Department of Endocrinology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
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Kooptiwut S, Wanchai K, Semprasert N, Srisawat C, Yenchitsomanus PT. Estrogen attenuates AGTR1 expression to reduce pancreatic β-cell death from high glucose. Sci Rep 2017; 7:16639. [PMID: 29192236 DOI: 10.1038/s41598-017-15237-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2017] [Accepted: 10/24/2017] [Indexed: 01/09/2023] Open
Abstract
Chronic exposure of pancreatic β-cells to high glucose levels results in β-cell dysfunction and death. These effects can be protected by estrogen. The local pancreatic renin-angiotensin system (RAS) has been shown as a novel pathological pathway of high-glucose-induced cell death. The effect of estrogen on pancreatic RAS is still unknown. This study examines whether estrogen protects against pancreatic β-cell death caused by glucotoxicity via a decrease in the pancreatic β-cell RAS pathway. When INS-1 cells were cultured in a high glucose medium, cell death was significantly higher than when the cells were cultured in a basal glucose medium; similarly, there were also higher levels of AGTR1 and p47ph°x mRNA, and protein expression. Moreover, the addition of 10−8 M 17β-estradiol to INS-1 cells cultured in a high glucose medium markedly reduced cell death, AGTR1 and p47ph°x mRNA levels, and protein expression. Similar results were demonstrated in the pancreatic islets. The presence of 10−8 M 17β-estradiol, losartan, or a combination of both, in a high glucose medium had similar levels of reduction of p47ph°x mRNA and protein expression, compared with those cultured in high glucose. Taken together, estrogen protected pancreatic β-cells from high-glucose-induced cell death by reducing the AGTR1 pathway.
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11
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Lombardi A, Gambardella J, Du XL, Sorriento D, Mauro M, Iaccarino G, Trimarco B, Santulli G. Sirolimus induces depletion of intracellular calcium stores and mitochondrial dysfunction in pancreatic beta cells. Sci Rep. 2017;7:15823. [PMID: 29158477 PMCID: PMC5696524 DOI: 10.1038/s41598-017-15283-y] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Accepted: 10/20/2017] [Indexed: 12/19/2022] Open
Abstract
Sirolimus (rapamycin) is an immunosuppressive drug used in transplantation. One of its major side effects is the increased risk of diabetes mellitus; however, the exact mechanisms underlying such association have not been elucidated. Here we show that sirolimus impairs glucose-stimulated insulin secretion both in human and murine pancreatic islets and in clonal β cells in a dose- and time-dependent manner. Importantly, we demonstrate that sirolimus markedly depletes calcium (Ca2+) content in the endoplasmic reticulum and significantly decreases glucose-stimulated mitochondrial Ca2+ uptake. Crucially, the reduced mitochondrial Ca2+ uptake is mirrored by a significant impairment in mitochondrial respiration. Taken together, our findings indicate that sirolimus causes depletion of intracellular Ca2+ stores and alters mitochondrial fitness, eventually leading to decreased insulin release. Our results provide a novel molecular mechanism underlying the increased incidence of diabetes mellitus in patients treated with this drug.
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12
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Chan SMH, Lau YS, Miller AA, Ku JM, Potocnik S, Ye JM, Woodman OL, Herbert TP. Angiotensin II Causes β-Cell Dysfunction Through an ER Stress-Induced Proinflammatory Response. Endocrinology 2017; 158:3162-3173. [PMID: 28938442 DOI: 10.1210/en.2016-1879] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Accepted: 08/11/2017] [Indexed: 12/20/2022]
Abstract
The metabolic syndrome is associated with an increase in the activation of the renin angiotensin system, whose inhibition reduces the incidence of new-onset diabetes. Importantly, angiotensin II (AngII), independently of its vasoconstrictor action, causes β-cell inflammation and dysfunction, which may be an early step in the development of type 2 diabetes. The aim of this study was to determine how AngII causes β-cell dysfunction. Islets of Langerhans were isolated from C57BL/6J mice that had been infused with AngII in the presence or absence of taurine-conjugated ursodeoxycholic acid (TUDCA) and effects on endoplasmic reticulum (ER) stress, inflammation, and β-cell function determined. The mechanism of action of AngII was further investigated using isolated murine islets and clonal β cells. We show that AngII triggers ER stress, an increase in the messenger RNA expression of proinflammatory cytokines, and promotes β-cell dysfunction in murine islets of Langerhans both in vivo and ex vivo. These effects were significantly attenuated by TUDCA, an inhibitor of ER stress. We also show that AngII-induced ER stress is required for the increased expression of proinflammatory cytokines and is caused by reactive oxygen species and IP3 receptor activation. These data reveal that the induction of ER stress is critical for AngII-induced β-cell dysfunction and indicates how therapies that promote ER homeostasis may be beneficial in the prevention of type 2 diabetes.
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Affiliation(s)
- Stanley M H Chan
- School of Health and Biomedical Sciences, Royal Melbourne Institute of Technology University, Bundoora, Victoria 3083, Australia
| | - Yeh-Siang Lau
- Department of Pharmacology, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Alyson A Miller
- School of Health and Biomedical Sciences, Royal Melbourne Institute of Technology University, Bundoora, Victoria 3083, Australia
| | - Jacqueline M Ku
- School of Health and Biomedical Sciences, Royal Melbourne Institute of Technology University, Bundoora, Victoria 3083, Australia
| | - Simon Potocnik
- School of Health and Biomedical Sciences, Royal Melbourne Institute of Technology University, Bundoora, Victoria 3083, Australia
| | - Ji-Ming Ye
- School of Health and Biomedical Sciences, Royal Melbourne Institute of Technology University, Bundoora, Victoria 3083, Australia
| | - Owen L Woodman
- School of Health and Biomedical Sciences, Royal Melbourne Institute of Technology University, Bundoora, Victoria 3083, Australia
| | - Terence P Herbert
- School of Health and Biomedical Sciences, Royal Melbourne Institute of Technology University, Bundoora, Victoria 3083, Australia
- School of Pharmacy, College of Science, Joseph Banks Laboratories, University of Lincoln, Lincoln, Lincolnshire LN6 7DL, United Kingdom
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13
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Kim N, Jung Y, Nam M, Sun Kang M, Lee MK, Cho Y, Choi EK, Hwang GS, Soo Kim H. Angiotensin II affects inflammation mechanisms via AMPK-related signalling pathways in HL-1 atrial myocytes. Sci Rep 2017; 7:10328. [PMID: 28871102 PMCID: PMC5583339 DOI: 10.1038/s41598-017-09675-3] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Accepted: 07/27/2017] [Indexed: 11/30/2022] Open
Abstract
Inflammation is a common cause of cardiac arrhythmia. Angiotensin ІІ (Ang ІІ) is a major contributing factor in the pathogenesis of cardiac inflammation; however, its underlying molecular mechanism remains unclear. Here, we explored the effect of Ang ІІ on inflammatory mechanisms and oxidative stress using HL-1 atrial myocytes. We showed that Ang ІІ activated c-Jun N-terminal kinase (JNK) phosphorylation and other inflammatory markers, such as transforming growth factor-β1 (TGF-β1) and tumor necrosis factor-α (TNF-α). Ang ІІ decreased oxygen consumption rate, which resulted in reactive oxygen species (ROS) generation and inhibition of ROS blocked Ang II-mediated JNK phosphorylation and TGF-β1 induction. Ang ІІ induced the expression of its specific receptor, AT1R. Ang II-induced intracellular calcium production associated with Ang ІІ-mediated signalling pathways. In addition, the generated ROS and calcium stimulated AMPK phosphorylation. Inhibiting AMPK blocked Ang II-mediated JNK and TGF-β signalling pathways. Ang ІІ concentration, along with TGF-β1 and tumor necrosis factor-α levels, was slightly increased in plasma of patients with atrial fibrillation. Taken together, these results suggest that Ang ІІ induces inflammation mechanisms through an AMPK-related signalling pathway. Our results provide new molecular targets for the development of therapeutics for inflammation-related conditions, such as atrial fibrillation.
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Affiliation(s)
- Nami Kim
- Integrated Metabolomics Research Group, Western Seoul Center, Korea Basic Science Institute, Seoul, 120-140, Republic of Korea
| | - Youngae Jung
- Integrated Metabolomics Research Group, Western Seoul Center, Korea Basic Science Institute, Seoul, 120-140, Republic of Korea
| | - Miso Nam
- Integrated Metabolomics Research Group, Western Seoul Center, Korea Basic Science Institute, Seoul, 120-140, Republic of Korea
| | - Mi Sun Kang
- Integrated Metabolomics Research Group, Western Seoul Center, Korea Basic Science Institute, Seoul, 120-140, Republic of Korea
| | - Min Kyung Lee
- Integrated Metabolomics Research Group, Western Seoul Center, Korea Basic Science Institute, Seoul, 120-140, Republic of Korea
| | - Youngjin Cho
- Division of Cardiology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Eue-Keun Choi
- Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
| | - Geum-Sook Hwang
- Integrated Metabolomics Research Group, Western Seoul Center, Korea Basic Science Institute, Seoul, 120-140, Republic of Korea. .,Chemistry & Nanoscience, Ewha Womans University, Seoul, Republic of Korea.
| | - Hyeon Soo Kim
- Department of Anatomy, Korea University College of Medicine, Seoul, 02841, Republic of Korea.
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14
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Thivolet C, Vial G, Cassel R, Rieusset J, Madec AM. Reduction of endoplasmic reticulum- mitochondria interactions in beta cells from patients with type 2 diabetes. PLoS One 2017; 12:e0182027. [PMID: 28742858 PMCID: PMC5526536 DOI: 10.1371/journal.pone.0182027] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2017] [Accepted: 07/11/2017] [Indexed: 11/18/2022] Open
Abstract
Type 2 diabetes develops when beta cells are not able to fulfill insulin needs. The role of the endoplasmic reticulum-mitochondria junction in coordinating the functions of these two organelles throughout the natural history of type 2 diabetes is determinant and may explain the alterations of insulin biosynthesis. Our goal was to study endoplasmic reticulum and mitochondrial interactions in human beta cells from organ donors with type 2 diabetes. Pancreas samples were obtained via the network for pancreatic organ donors with diabetes (nPOD) based on disease status with 12 subjects with type 2 diabetes and 9 non-diabetic controls. We examined pancreatic specimens by immunofluorescence, in situ hybridization and in situ proximity ligation assay and compared the results to an in vitro model of beta-cell dysfunction. Expression of proteins that enable tethering and exchanges between endoplasmic reticulum (ER) and mitochondria and quantification of interconnection through mitochondria associated membranes (MAM) was investigated. In beta cells from type 2 diabetic cases as compared to controls, there was a significant increase in reticular expression of inositol triphosphate receptor-2 (IP3R2) both at the protein and mRNA levels, no difference in mitochondrial transit peptide receptor TOM20 and mitofusin-2 expressions, and a decrease in the expression of voltage-dependent anion channel-1 (VDAC-1). The number of IP3R2-VDAC-1 complexes identified by in situ proximity ligation assay was significantly lower in diabetic islets and in beta cells of diabetics as compared to controls. Treatment of Min6-B1 cells with palmitate altered glucose-stimulated insulin secretion, increased ER stress and significantly reduced ER-mitochondrial interactions. We can conclude that specific changes in reticular and mitochondrial beta cell proteins characterize human type 2 diabetes with reduction in organelle interactions. This finding opens new targets of intervention.
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Affiliation(s)
- Charles Thivolet
- INSERM UMR-1060, CarMeN Laboratory, Lyon 1 University, INRA U1235, Lyon, France
- Hospices Civils de Lyon, Lyon-Sud Hospital, Department of Endocrinology and Diabetes, Pierre-Bénite, France
- * E-mail:
| | - Guillaume Vial
- INSERM UMR-1060, CarMeN Laboratory, Lyon 1 University, INRA U1235, Lyon, France
| | - Romeo Cassel
- INSERM UMR-1060, CarMeN Laboratory, Lyon 1 University, INRA U1235, Lyon, France
| | - Jennifer Rieusset
- INSERM UMR-1060, CarMeN Laboratory, Lyon 1 University, INRA U1235, Lyon, France
| | - Anne-Marie Madec
- INSERM UMR-1060, CarMeN Laboratory, Lyon 1 University, INRA U1235, Lyon, France
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15
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Jiang D, Zhuang J, Peng W, Lu Y, Liu H, Zhao Q, Chi C, Li X, Zhu G, Xu X, Yan C, Xu Y, Ge J, Pang J. Phospholipase Cγ1 Mediates Intima Formation Through Akt-Notch1 Signaling Independent of the Phospholipase Activity. J Am Heart Assoc 2017; 6:JAHA.117.005537. [PMID: 28698260 PMCID: PMC5586285 DOI: 10.1161/jaha.117.005537] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Background Vascular smooth muscle cell proliferation, migration, and dedifferentiation are critical for vascular diseases. Recently, it was demonstrated that Notch receptors have opposing effects on intima formation after vessel injury. Therefore, it is important to investigate the specific regulatory pathways that activate the different Notch receptors. Methods and Results There was a time‐ and dose‐dependent activation of Notch1 by angiotensin II and platelet‐derived growth factor in vascular smooth muscle cells. When phospholipase Cγ1 (PLCγ1) expression was reduced by small interfering RNA, Notch1 activation and Hey2 expression (Notch target gene) induced by angiotensin II or platelet‐derived growth factor were remarkably inhibited, while Notch2 degradation was not affected. Mechanistically, we observed an association of PLCγ1 and Akt, which increased after angiotensin II or platelet‐derived growth factor stimulation. PLCγ1 knockdown significantly inhibited Akt activation. Importantly, PLCγ1 phospholipase site mutation (no phospholipase activity) did not affect Akt activation. Furthermore, PLCγ1 depletion inhibited platelet‐derived growth factor–induced vascular smooth muscle cell proliferation, migration, and dedifferentiation, while it increased apoptosis. In vivo, PLCγ1 and control small interfering RNA were delivered periadventitially in pluronic gel and complete carotid artery ligation was performed. Morphometric analysis 21 days after ligation demonstrated that PLCγ1 small interfering RNA robustly attenuated intima area and intima/media ratio compared with the control group. Conclusions PLCγ1‐Akt–mediated Notch1 signaling is crucial for intima formation. This effect is attributable to PLCγ1‐Akt interaction but not PLCγ1 phospholipase activity. Specific inhibition of the PLCγ1 and Akt interaction will be a promising therapeutic strategy for preventing vascular remodeling.
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Affiliation(s)
- Dongyang Jiang
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Jianhui Zhuang
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Wenhui Peng
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Yuyan Lu
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Hao Liu
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Qian Zhao
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Chen Chi
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Xiankai Li
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Guofu Zhu
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Xiangbin Xu
- Aab Cardiovascular Research Institute and Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY
| | - Chen Yan
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China.,Aab Cardiovascular Research Institute and Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY
| | - Yawei Xu
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Junbo Ge
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Jinjiang Pang
- Department of Cardiology, Pan-Vascular Research Institute, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China .,Aab Cardiovascular Research Institute and Department of Medicine, University of Rochester School of Medicine and Dentistry, Rochester, NY
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16
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Cassel R, Ducreux S, Alam MR, Dingreville F, Berlé C, Burda-Jacob K, Chauvin MA, Chikh K, Païta L, Al-Mawla R, Crola Da Silva C, Rieusset J, Thivolet C, Van Coppenolle F, Madec AM. Protection of Human Pancreatic Islets from Lipotoxicity by Modulation of the Translocon. PLoS One 2016; 11:e0148686. [PMID: 26862742 PMCID: PMC4749224 DOI: 10.1371/journal.pone.0148686] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Accepted: 01/20/2016] [Indexed: 12/04/2022] Open
Abstract
Type 2 diabetes is characterized by peripheral insulin resistance and pancreatic beta cell dysfunction. Elevated free fatty acids (FFAs) may impair beta cell function and mass (lipotoxicity). Altered calcium homeostasis may be involved in defective insulin release. The endoplasmic reticulum (ER) is the major intracellular calcium store. Lipotoxicity induces ER stress and in parallel an ER calcium depletion through unknown ER calcium leak channels. The main purposes of this study is first to identify one of these channels and secondly, to check the opportunity to restore beta cells function (i.e., insulin secretion) after pharmacological inhibition of ER calcium store depletion. We investigated the functionality of translocon, an ER calcium leak channel and its involvement on FFAs-induced alterations in MIN6B1 cells and in human pancreatic islets. We evidenced that translocon acts as a functional ER calcium leak channel in human beta cells using anisomycin and puromycin (antibiotics), respectively blocker and opener of this channel. Puromycin induced a significant ER calcium release, inhibited by anisomycin pretreatment. Palmitate treatment was used as FFA model to induce a mild lipotoxic effect: ER calcium content was reduced, ER stress but not apoptosis were induced and glucose induced insulin secretion was decreased in our beta cells. Interestingly, translocon inhibition by chronic anisomycin treatment prevented dysfunctions induced by palmitate, avoiding reticular calcium depletion, ER stress and restoring insulin secretion. Our results provide for the first time compelling evidence that translocon actively participates to the palmitate-induced ER calcium leak and insulin secretion decrease in beta cells. Its inhibition reduces these lipotoxic effects. Taken together, our data indicate that TLC may be a new potential target for the treatment of type 2 diabetes.
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Affiliation(s)
- R. Cassel
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Charles Mérieux Lyon-Sud, F-69003 Lyon, France
| | - S. Ducreux
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Rockefeller, F-69003 Lyon, France
| | - M. R. Alam
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Rockefeller, F-69003 Lyon, France
| | - F. Dingreville
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Charles Mérieux Lyon-Sud, F-69003 Lyon, France
| | - C. Berlé
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Charles Mérieux Lyon-Sud, F-69003 Lyon, France
| | - K. Burda-Jacob
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Charles Mérieux Lyon-Sud, F-69003 Lyon, France
| | - M. A. Chauvin
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Charles Mérieux Lyon-Sud, F-69003 Lyon, France
| | - K. Chikh
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Charles Mérieux Lyon-Sud, F-69003 Lyon, France
| | - L. Païta
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Rockefeller, F-69003 Lyon, France
| | - R. Al-Mawla
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Rockefeller, F-69003 Lyon, France
| | - C. Crola Da Silva
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Rockefeller, F-69003 Lyon, France
| | - J. Rieusset
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Charles Mérieux Lyon-Sud, F-69003 Lyon, France
| | - C. Thivolet
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Charles Mérieux Lyon-Sud, F-69003 Lyon, France
- Hospices Civils de Lyon, Hôpital Lyon-Sud, Service d’Endocrinologie, Diabétologie et Nutrition, F-69310 Pierre Bénite, France
| | - F. Van Coppenolle
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Rockefeller, F-69003 Lyon, France
| | - A. M. Madec
- Inserm UMR-U1060 CarMeN Laboratory, University Lyon 1, INRA U1235, INSA-Lyon, Facultés de médecine Charles Mérieux Lyon-Sud, F-69003 Lyon, France
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17
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Jung TW, Choi KM. Pharmacological Modulators of Endoplasmic Reticulum Stress in Metabolic Diseases. Int J Mol Sci 2016; 17:ijms17020192. [PMID: 26840310 PMCID: PMC4783926 DOI: 10.3390/ijms17020192] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2015] [Revised: 01/20/2016] [Accepted: 01/27/2016] [Indexed: 01/23/2023] Open
Abstract
The endoplasmic reticulum (ER) is the principal organelle responsible for correct protein folding, a step in protein synthesis that is critical for the functional conformation of proteins. ER stress is a primary feature of secretory cells and is involved in the pathogenesis of numerous human diseases, such as certain neurodegenerative and cardiometabolic disorders. The unfolded protein response (UPR) is a defense mechanism to attenuate ER stress and maintain the homeostasis of the organism. Two major degradation systems, including the proteasome and autophagy, are involved in this defense system. If ER stress overwhelms the capacity of the cell's defense mechanisms, apoptotic death may result. This review is focused on the various pharmacological modulators that can protect cells from damage induced by ER stress. The possible mechanisms for cytoprotection are also discussed.
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Affiliation(s)
- Tae Woo Jung
- Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Korea University, Seoul 152-703, Korea.
| | - Kyung Mook Choi
- Division of Endocrinology and Metabolism, Department of Internal Medicine, College of Medicine, Korea University, Seoul 152-703, Korea.
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18
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Fukui K, Kawahito H, Wakana N, Kikai M, Terada K, Yamamoto K, Irie D, Kato T, Miyagawa S, Yamada H. Dipeptidyl peptidase-4 inhibitor sitagliptin improves pancreatic β-cell function in hypertensive diabetic patients treated with angiotensin receptor blockers. J Renin Angiotensin Aldosterone Syst 2015. [PMID: 26195265 DOI: 10.1177/1470320315587180] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
INTRODUCTION Dipeptidyl peptidase (DPP)-4 inhibitors, a novel oral anti-diabetic agents, exert a protective effect on pancreatic β-cell function in patients with type 2 diabetic mellitus (T2DM). However, their beneficial effect in hypertensive T2DM patients treated with angiotensin receptor blockers (ARBs) has not been investigated. METHODS In this open-label multicenter randomized study, a total of 55 hypertensive T2DM patients treated with ARBs were randomly assigned to receive the DPP-4 inhibitor sitagliptin or sulfonylurea (SU). RESULTS After 24 weeks of treatment, a significant reduction in fasting blood glucose was only observed in the sitagliptin group, while HbA1c was significantly reduced in both groups. Homeostasis model assessment of insulin resistance was not significantly improved in either group. Indicators of pancreatic β-cell function, including proinsulin to insulin ratio and homeostasis model assessment of β-cell function, were significantly improved in the sitagliptin group, but not in the SU group. The beneficial effects of sitagliptin were observed in hypoglycemic drug naïve patients, but not in patients who had received SU monotherapy prior to the study. CONCLUSION Treatment with the DPP-4 inhibitor sitagliptin might exert beneficial effects on pancreatic β-cell function in ARB-treated T2DM patients and its efficacy might be more pronounced in hypoglycemic drug naïve patients.
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Affiliation(s)
- Kensuke Fukui
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, Japan
| | - Hiroyuki Kawahito
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, Japan
| | - Noriyuki Wakana
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, Japan
| | - Masakazu Kikai
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, Japan
| | - Kensuke Terada
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, Japan
| | - Keita Yamamoto
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, Japan
| | - Daisuke Irie
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, Japan
| | - Taku Kato
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, Japan
| | - Sonoko Miyagawa
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, Japan
| | - Hiroyuki Yamada
- Department of Cardiovascular Medicine, Kyoto Prefectural University of Medicine, Japan
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19
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Pantazi E, Bejaoui M, Zaouali MA, Folch-Puy E, Pinto Rolo A, Panisello A, Palmeira CM, Roselló-Catafau J. Losartan activates sirtuin 1 in rat reduced-size orthotopic liver transplantation. World J Gastroenterol 2015; 21:8021-8031. [PMID: 26185373 PMCID: PMC4499344 DOI: 10.3748/wjg.v21.i26.8021] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2015] [Revised: 02/25/2015] [Accepted: 04/03/2015] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate a possible association between losartan and sirtuin 1 (SIRT1) in reduced-size orthotopic liver transplantation (ROLT) in rats.
METHODS: Livers of male Sprague-Dawley rats (200-250 g) were preserved in University of Wisconsin preservation solution for 1 h at 4 °C prior to ROLT. In an additional group, an antagonist of angiotensin II type 1 receptor (AT1R), losartan, was orally administered (5 mg/kg) 24 h and 1 h before the surgical procedure to both the donors and the recipients. Transaminase (as an indicator of liver injury), SIRT1 activity, and nicotinamide adenine dinucleotide (NAD+, a co-factor necessary for SIRT1 activity) levels were determined by biochemical methods. Protein expression of SIRT1, acetylated FoxO1 (ac-FoxO1), NAMPT (the precursor of NAD+), heat shock proteins (HSP70, HO-1) expression, endoplasmic reticulum stress (GRP78, IRE1α, p-eIF2) and apoptosis (caspase 12 and caspase 3) parameters were determined by Western blot. Possible alterations in protein expression of mitogen activated protein kinases (MAPK), such as p-p38 and p-ERK, were also evaluated. Furthermore, the SIRT3 protein expression and mRNA levels were examined.
RESULTS: The present study demonstrated that losartan administration led to diminished liver injury when compared to ROLT group, as evidenced by the significant decreases in alanine aminotransferase (358.3 ± 133.44 vs 206 ± 33.61, P < 0.05) and aspartate aminotransferase levels (893.57 ± 397.69 vs 500.85 ± 118.07, P < 0.05). The lessened hepatic injury in case of losartan was associated with enhanced SIRT1 protein expression and activity (5.27 ± 0.32 vs 6.08 ± 0.30, P < 0.05). This was concomitant with increased levels of NAD+ (0.87 ± 0.22 vs 1.195 ± 0.144, P < 0.05) the co-factor necessary for SIRT1 activity, as well as with decreases in ac-FoxO1 expression. Losartan treatment also provoked significant attenuation of endoplasmic reticulum stress parameters (GRP78, IRE1α, p-eIF2) which was consistent with reduced levels of both caspase 12 and caspase 3. Furthermore, losartan administration stimulated HSP70 protein expression and attenuated HO-1 expression. However, no changes were observed in protein or mRNA expression of SIRT3. Finally, the protein expression pattern of p-ERK and p-p38 were not altered upon losartan administration.
CONCLUSION: The present study reports that losartan induces SIRT1 expression and activity, and that it reduces hepatic injury in a ROLT model.
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Abstract
BACKGROUND Results of several studies have shown a possible beneficial effect of renin-angiotensin system (RAS) inhibitors on diabetic retinopathy, but the findings were contradictory. We did a systematic review and meta-analysis to assess the effect of RAS inhibitors on diabetic retinopathy. METHODS We identified relevant publications in PubMed, Embase, Cochrane Library Central Register of Controlled Trials, and abstracts from main annual meetings. Only randomised controlled trials comparing angiotensin-converting enzyme (ACE) inhibitor or angiotensin-receptor blocker (ARB) monotherapy with other antihypertensive drugs or placebo in type 1 or type 2 diabetes were eligible for inclusion in the analysis. The primary outcomes were progression and regression of diabetic retinopathy in all patients and several subgroups. Risk ratios (RRs) with corresponding 95% CIs were pooled. We also did a network meta-analysis to assess the effect of different antihypertensive drugs on diabetic retinopathy by ranking order. This study is registered with the International Prospective Register of Systematic Reviews (PROSPERO), number CRD42013004548. FINDINGS 21 randomised clinical trials with 13,823 participants were included in the meta-analysis. RAS inhibitors were associated with reduced risk of progression (absolute risk difference -3%, 95% CI -5 to -1; pooled RR 0.87, 95% CI 0.80-0.95; p=0.002) and increased possibility of regression of diabetic retinopathy (8%, 1-16; RR 1.39, 95% CI 1.19-1.61; p=0.00002). In normotensive patients, RAS inhibitors decreased risk of diabetic retinopathy progression (0.81, 0.69-0.94; p=0.007) and increased possibility of regression (1.43, 1.14-1.79; p=0.002). In hypertensive patients, RAS inhibitors were not associated with difference in risk of progression of diabetic retinopathy (0.93, 0.79-1.10; p=0.42) or possibility of diabetic retinopathy regression (2.21, 0.92-5.31; p=0.08). ACE inhibitors were associated with reduced risk of diabetic retinopathy progression (0.84, 0.75-0.94; p=0.002) and higher possibility of disease regression (1.50, 1.20-1.86; p=0.0003). ARBs were associated with a higher possibility of diabetic retinopathy regression (1.32, 1.07-1.61; p=0.008), but had no effect on disease progression (0.92, 0.80-1.06; p=0.25). Network meta-analysis showed the association of antihypertensive drugs with risk of diabetic retinopathy progression was lowest for ACE inhibitors, followed by ARBs, β blockers, calcium channel blockers, and placebo in rank order. The association of antihypertensive drugs with possibility of diabetic retinopathy regression was highest for ACE inhibitors, followed by ARBs, placebo, and calcium channel blockers in rank order. INTERPRETATION In patients with diabetes, RAS inhibitors reduce the risk of diabetic retinopathy, and increase the possibility of diabetic retinopathy regression. ACE inhibitors might be better than ARBs for treating diabetic retinopathy, and might exert the most beneficial effect on diabetic retinopathy of all widely used antihypertensive drug classes.
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Affiliation(s)
- Bin Wang
- Department of Endocrinology, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Fang Wang
- Department of Endocrinology, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Yue Zhang
- Department of Pathology, Shanghai University of Chinese Medicine, Shanghai, China
| | - Shi-Hua Zhao
- Department of Endocrinology, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Wen-Juan Zhao
- Department of Endocrinology, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Sheng-Li Yan
- Department of Endocrinology, the Affiliated Hospital of Qingdao University, Qingdao, China
| | - Yan-Gang Wang
- Department of Endocrinology, the Affiliated Hospital of Qingdao University, Qingdao, China.
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Oh YS. Mechanistic insights into pancreatic beta-cell mass regulation by glucose and free fatty acids. Anat Cell Biol 2015; 48:16-24. [PMID: 25806118 PMCID: PMC4371177 DOI: 10.5115/acb.2015.48.1.16] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2014] [Accepted: 02/04/2015] [Indexed: 01/14/2023] Open
Abstract
Pancreatic islets are responsible for blood glucose homeostasis. Reduced numbers of functional (insulin-secreting) beta-cells in pancreatic islets underlies diabetes. Restoration of the secretion of the proper amount of insulin is a goal. Beta-cell mass is increased by neogenesis, proliferation and cell hypertrophy, and is decreased by beta-cell death primarily through apoptosis. Many hormones and nutrients affect beta-cell mass, and glucose and free fatty acid are thought to be the most important determinants of beta-cell equilibrium. A number of molecular pathways have been implicated in beta-cell mass regulation and have been studied. This review will focus on the role of the principle metabolites, glucose and free fatty acid, and the downstream signaling pathways regulating beta-cell mass by these metabolites.
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Affiliation(s)
- Yoon Sin Oh
- Lee Gil Ya Cancer and Diabetes Institute, Gachon University, Incheon, Korea. ; Gachon Medical Research Institute, Gil Hospital, Incheon, Korea
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Kooptiwut S, Hanchang W, Semprasert N, Junking M, Limjindaporn T, Yenchitsomanus PT. Testosterone reduces AGTR1 expression to prevent β-cell and islet apoptosis from glucotoxicity. J Endocrinol 2015; 224:215-24. [PMID: 25512346 DOI: 10.1530/joe-14-0397] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Hypogonadism in men is associated with an increased incidence of type 2 diabetes. Supplementation with testosterone has been shown to protect pancreatic β-cell against apoptosis due to toxic substances including streptozotocin and high glucose. One of the pathological mechanisms of glucose-induced pancreatic β-cell apoptosis is the induction of the local rennin-angiotensin-aldosterone system (RAAS). The role of testosterone in regulation of the pancreatic RAAS is still unknown. This study aims to investigate the protective action of testosterone against glucotoxicity-induced pancreatic β-cell apoptosis via alteration of the pancreatic RAAS pathway. Rat insulinoma cell line (INS-1) cells or isolated male mouse islets were cultured in basal and high-glucose media in the presence or absence of testosterone, losartan, and angiotensin II (Ang II), then cell apoptosis, cleaved caspase 3 expression, oxidative stress, and expression of angiotensin II type 1 receptor (AGTR1) and p47(phox) mRNA and protein were measured. Testosterone and losartan showed similar effects in reducing pancreatic β-cell apoptosis. Testosterone significantly reduced expression of AGTR1 protein in INS-1 cells cultured in high-glucose medium or high-glucose medium with Ang II. Testosterone decreased the expression of AGTR1 and p47(phox) mRNA and protein in comparison with levels in cells cultured in high-glucose medium alone. Furthermore, testosterone attenuated superoxide production when co-cultured with high-glucose medium. In contrast, when cultured in basal glucose, supplementation of testosterone did not have any effect on cell apoptosis, oxidative stress, and expression of AGT1R and p47(phox). In addition, high-glucose medium did not increase cleaved caspase 3 in AGTR1 knockdown experiments. Thus, our results indicated that testosterone prevents pancreatic β-cell apoptosis due to glucotoxicity through reduction of the expression of ATGR1 and its signaling pathway.
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Affiliation(s)
- Suwattanee Kooptiwut
- Department of PhysiologyDepartment of AnatomyDivision of Molecular MedicineDepartment of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
| | - Wanthanee Hanchang
- Department of PhysiologyDepartment of AnatomyDivision of Molecular MedicineDepartment of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
| | - Namoiy Semprasert
- Department of PhysiologyDepartment of AnatomyDivision of Molecular MedicineDepartment of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
| | - Mutita Junking
- Department of PhysiologyDepartment of AnatomyDivision of Molecular MedicineDepartment of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
| | - Thawornchai Limjindaporn
- Department of PhysiologyDepartment of AnatomyDivision of Molecular MedicineDepartment of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
| | - Pa-thai Yenchitsomanus
- Department of PhysiologyDepartment of AnatomyDivision of Molecular MedicineDepartment of Research and Development, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
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Mizera M, Lewadowska K, Talaczyńska A, Cielecka-Piontek J. Computational study of influence of diffuse basis functions on geometry optimization and spectroscopic properties of losartan potassium. Spectrochim Acta A Mol Biomol Spectrosc 2015; 137:1029-1038. [PMID: 25286115 DOI: 10.1016/j.saa.2014.09.036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2014] [Revised: 09/12/2014] [Accepted: 09/15/2014] [Indexed: 06/03/2023]
Abstract
The work was aimed at investigating the influence of diffusion of basis functions on the geometry optimization of molecule of losartan in acidic and salt form. Spectroscopic properties of losartan potassium were also calculated and compared with experiment. Density functional theory method with various basis sets: 6-31G(d,p) and its diffused variations 6-31G(d,p)+ and 6-31G(d,p)++ was used. Application of diffuse basis functions in geometry optimization resulted in significant change of total molecule energy. Total molecule energy of losartan potassium decreased by 112.91kJ/mol and 114.32kJ/mol for 6-31G(d,p)+ and 6-31G(d,p)++ basis sets, respectively. Almost the same decrease was observed for losartan: 114.99kJ/mol and 117.08kJ/mol respectively for 6-31G(d,p)+ and 6-31G(d,p)++ basis sets. Further investigation showed significant difference within geometries of losartan potassium optimized with investigated basis sets. Application of diffused basis functions resulted in average 1.29Å difference in relative position between corresponding atoms of three obtained geometries. Similar study taken on losartan resulted in only average 0.22Å of dislocation. Extensive analysis of geometry changes in molecules obtained with diffused and non-diffuse basis functions was carried out in order to elucidate observed changes. The analysis was supported by electrostatic potential maps and calculation of natural atomic charges. UV, FT-IR and Raman spectra of losartan potassium were calculated and compared with experimental results. No crucial differences between Raman spectra obtained with different basis sets were observed. However, FT-IR spectra of geometry of losartan potassium optimized with 6-31G(d,p)++ basis set resulted in 40% better correlation with experimental FT-IR spectra than FT-IR calculated with geometry optimized with 6-31G(d,p) basis set. Therefore, it is highly advisable to optimize geometry of molecules with ionic interactions using diffuse basis functions when accuracy of results is a priority.
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Affiliation(s)
- Mikołaj Mizera
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Poznan University of Medical Sciences, Grunwaldzka 6, 60-780 Poznań, Poland
| | - Kornelia Lewadowska
- Institute of Molecular Physics, Polish Academy of Science, 60-179 Poznań, Poland
| | - Alicja Talaczyńska
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Poznan University of Medical Sciences, Grunwaldzka 6, 60-780 Poznań, Poland
| | - Judyta Cielecka-Piontek
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Poznan University of Medical Sciences, Grunwaldzka 6, 60-780 Poznań, Poland.
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