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Moreno-Gázquez I, Pérez-Palacios R, Abengochea-Quílez L, Lahuerta Pueyo C, Roteta Unceta Barrenechea A, Andrés Gracia A, Aibar Arregui MA, Menao Guillén S. Targeted sequencing of selected functional genes in patients with wild-type transthyretin amyloidosis. BMC Res Notes 2023; 16:249. [PMID: 37784196 PMCID: PMC10546623 DOI: 10.1186/s13104-023-06491-z] [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: 03/19/2023] [Accepted: 09/03/2023] [Indexed: 10/04/2023] Open
Abstract
OBJECTIVE Wild-type transthyretin (ATTRwt) amyloidosis is caused by the misfolding and deposition of the transthyretin protein (TTR) in the absence of mutations in the TTR gene. Studies regarding the variant form of ATTR amyloidosis (ATTRv) suggest that the presence of single-nucleotide polymorphisms (SNP) in genes other than the TTR, may influence the development of the disease. However, other genetic factors involved in the aetiopathogenesis of ATTRwt are currently unknown. This work investigates the presence of sequence variants in genes selected for their possible impact on ATTRwt amyloidosis. To do so, targeted sequencing of 84 protein-coding genes was performed in a cohort of 27 patients diagnosed with ATTRwt. RESULTS After applying quality and frequency filtering criteria, 72 rare or novel genetic variants were found. Subsequent classification according to the ACMG-AMP criteria resulted in 17 variants classified as of uncertain significance in 14 different genes. To our knowledge, this is the first report associating novel gene variants with ATTRwt amyloidosis. In conclusion, this study provides potential insights into the aetiopathogenesis of ATTRwt amyloidosis by linking novel coding-gene variants with the occurrence of the disease.
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Affiliation(s)
- Inmaculada Moreno-Gázquez
- Department of Clinical Biochemistry, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain.
- Basic Research in Internal Medicine Group, GIIS-084 (IIS Aragón), Zaragoza, Spain.
| | - Raquel Pérez-Palacios
- Department of Anatomy, Embryology and Genetics, Veterinary Faculty, University of Zaragoza, Zaragoza, Spain
- Basic Research in Internal Medicine Group, GIIS-084 (IIS Aragón), Zaragoza, Spain
| | - Lucia Abengochea-Quílez
- Health Research Institute in Aragón, Zaragoza, Spain
- Department of Chemical and Environmental Engineering, Campus Río Ebro- Edificio I+D, University of Zaragoza, Zaragoza, Spain
- Basic Research in Internal Medicine Group, GIIS-084 (IIS Aragón), Zaragoza, Spain
| | - Carmen Lahuerta Pueyo
- Department of Clinical Biochemistry, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain
- Basic Research in Internal Medicine Group, GIIS-084 (IIS Aragón), Zaragoza, Spain
| | - Ana Roteta Unceta Barrenechea
- Department of Nuclear Medicine, Multihospital Nuclear Medicine Clinical Unit of Aragón, Zaragoza, Spain
- Basic Research in Internal Medicine Group, GIIS-084 (IIS Aragón), Zaragoza, Spain
| | - Alejandro Andrés Gracia
- Department of Nuclear Medicine, Multihospital Nuclear Medicine Clinical Unit of Aragón, Zaragoza, Spain
- Basic Research in Internal Medicine Group, GIIS-084 (IIS Aragón), Zaragoza, Spain
| | - Miguel Angel Aibar Arregui
- Department of Internal Medicine, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain
- Basic Research in Internal Medicine Group, GIIS-084 (IIS Aragón), Zaragoza, Spain
| | - Sebastián Menao Guillén
- Department of Clinical Biochemistry, Hospital Clínico Universitario Lozano Blesa, Zaragoza, Spain
- Basic Research in Internal Medicine Group, GIIS-084 (IIS Aragón), Zaragoza, Spain
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2
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Guevara-Olaya L, Chimal-Vega B, Castañeda-Sánchez CY, López-Cossio LY, Pulido-Capiz A, Galindo-Hernández O, Díaz-Molina R, Ruiz Esparza-Cisneros J, García-González V. LDL Promotes Disorders in β-Cell Cholesterol Metabolism, Implications on Insulin Cellular Communication Mediated by EVs. Metabolites 2022; 12:754. [PMID: 36005626 PMCID: PMC9415214 DOI: 10.3390/metabo12080754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 08/05/2022] [Accepted: 08/08/2022] [Indexed: 12/01/2022] Open
Abstract
Dyslipidemia is described as a hallmark of metabolic syndrome, promoting a stage of metabolic inflammation (metainflammation) that could lead to misbalances in energetic metabolism, contributing to insulin resistance, and modifying intracellular cholesterol pathways and the renin-angiotensin system (RAS) in pancreatic islets. Low-density lipoprotein (LDL) hypercholesterolemia could disrupt the tissue communication between Langerhans β-cells and hepatocytes, wherein extracellular vesicles (EVs) are secreted by β-cells, and exposition to LDL can impair these phenomena. β-cells activate compensatory mechanisms to maintain insulin and metabolic homeostasis; therefore, the work aimed to characterize the impact of LDL on β-cell cholesterol metabolism and the implication on insulin secretion, connected with the regulation of cellular communication mediated by EVs on hepatocytes. Our results suggest that β-cells can endocytose LDL, promoting an increase in de novo cholesterol synthesis targets. Notably, LDL treatment increased mRNA levels and insulin secretion; this hyperinsulinism condition was associated with the transcription factor PDX-1. However, a compensatory response that maintains basal levels of intracellular calcium was described, mediated by the overexpression of calcium targets PMCA1/4, SERCA2, and NCX1, together with the upregulation of the unfolded protein response (UPR) through the activation of IRE1 and PERK arms to maintain protein homeostasis. The LDL treatment induced metainflammation by IL-6, NF-κB, and COX-2 overexpression. Furthermore, LDL endocytosis triggered an imbalance of the RAS components. LDL treatment increased the intracellular levels of cholesterol on lipid droplets; the adaptive β-cell response was portrayed by the overexpression of cholesterol transporters ABCA1 and ABCG1. Therefore, lipotoxicity and hyperinsulinism induced by LDL were regulated by the natural compound auraptene, a geranyloxyn coumarin modulator of cholesterol-esterification by ACAT1 enzyme inhibition. EVs isolated from β-cells impaired insulin signaling via mTOR/p70S6Kα in hepatocytes, a phenomenon regulated by auraptene. Our results show that LDL overload plays a novel role in hyperinsulinism, mechanisms associated with a dysregulation of intracellular cholesterol, lipotoxicity, and the adaptive UPR, which may be regulated by coumarin-auraptene; these conditions explain the affectations that occur during the initial stages of insulin resistance.
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Affiliation(s)
- Lizbeth Guevara-Olaya
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali 21000, BC, Mexico
- Laboratorio Multidisciplinario de Estudios Metabólicos y Cáncer, Facultad de Medicina Mexicali, Universidad Autónoma de BC, Mexicali 21000, BC, Mexico
| | - Brenda Chimal-Vega
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali 21000, BC, Mexico
- Laboratorio Multidisciplinario de Estudios Metabólicos y Cáncer, Facultad de Medicina Mexicali, Universidad Autónoma de BC, Mexicali 21000, BC, Mexico
| | - César Yahel Castañeda-Sánchez
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali 21000, BC, Mexico
- Laboratorio Multidisciplinario de Estudios Metabólicos y Cáncer, Facultad de Medicina Mexicali, Universidad Autónoma de BC, Mexicali 21000, BC, Mexico
| | - Leslie Y. López-Cossio
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali 21000, BC, Mexico
- Laboratorio Multidisciplinario de Estudios Metabólicos y Cáncer, Facultad de Medicina Mexicali, Universidad Autónoma de BC, Mexicali 21000, BC, Mexico
| | - Angel Pulido-Capiz
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali 21000, BC, Mexico
- Laboratorio de Biología Molecular, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali 21000, BC, Mexico
| | - Octavio Galindo-Hernández
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali 21000, BC, Mexico
- Laboratorio Multidisciplinario de Estudios Metabólicos y Cáncer, Facultad de Medicina Mexicali, Universidad Autónoma de BC, Mexicali 21000, BC, Mexico
| | - Raúl Díaz-Molina
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali 21000, BC, Mexico
- Laboratorio Multidisciplinario de Estudios Metabólicos y Cáncer, Facultad de Medicina Mexicali, Universidad Autónoma de BC, Mexicali 21000, BC, Mexico
| | | | - Victor García-González
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali 21000, BC, Mexico
- Laboratorio Multidisciplinario de Estudios Metabólicos y Cáncer, Facultad de Medicina Mexicali, Universidad Autónoma de BC, Mexicali 21000, BC, Mexico
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Molecular Mechanisms of Amylin Turnover, Misfolding and Toxicity in the Pancreas. Molecules 2022; 27:molecules27031021. [PMID: 35164285 PMCID: PMC8838401 DOI: 10.3390/molecules27031021] [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: 12/19/2021] [Revised: 01/24/2022] [Accepted: 01/29/2022] [Indexed: 12/13/2022] Open
Abstract
Amyloidosis is a common pathological event in which proteins self-assemble into misfolded soluble and insoluble molecular forms, oligomers and fibrils that are often toxic to cells. Notably, aggregation-prone human islet amyloid polypeptide (hIAPP), or amylin, is a pancreatic hormone linked to islet β-cells demise in diabetics. The unifying mechanism by which amyloid proteins, including hIAPP, aggregate and kill cells is still matter of debate. The pathology of type-2 diabetes mellitus (T2DM) is characterized by extracellular and intracellular accumulation of toxic hIAPP species, soluble oligomers and insoluble fibrils in pancreatic human islets, eventually leading to loss of β-cell mass. This review focuses on molecular, biochemical and cell-biology studies exploring molecular mechanisms of hIAPP synthesis, trafficking and degradation in the pancreas. In addition to hIAPP turnover, the dynamics and the mechanisms of IAPP–membrane interactions; hIAPP aggregation and toxicity in vitro and in situ; and the regulatory role of diabetic factors, such as lipids and cholesterol, in these processes are also discussed.
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Genetic polymorphisms in ABCA1 (rs2230806 and rs1800977) and LIPC (rs2070895) genes and their association with the risk of type 2 diabetes: a case control study. Int J Diabetes Dev Ctries 2021. [DOI: 10.1007/s13410-021-00984-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
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MicroRNA Sequences Modulated by Beta Cell Lipid Metabolism: Implications for Type 2 Diabetes Mellitus. BIOLOGY 2021; 10:biology10060534. [PMID: 34203703 PMCID: PMC8232095 DOI: 10.3390/biology10060534] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Revised: 06/08/2021] [Accepted: 06/09/2021] [Indexed: 12/23/2022]
Abstract
Alterations in lipid metabolism within beta cells and islets contributes to dysfunction and apoptosis of beta cells, leading to loss of insulin secretion and the onset of type 2 diabetes. Over the last decade, there has been an explosion of interest in understanding the landscape of gene expression which influences beta cell function, including the importance of small non-coding microRNA sequences in this context. This review sought to identify the microRNA sequences regulated by metabolic challenges in beta cells and islets, their targets, highlight their function and assess their possible relevance as biomarkers of disease progression in diabetic individuals. Predictive analysis was used to explore networks of genes targeted by these microRNA sequences, which may offer new therapeutic strategies to protect beta cell function and delay the onset of type 2 diabetes.
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Ye Y, Gao J, Liang J, Yang Y, Lv C, Chen M, Wang J, Zhu D, Rong R, Xu M, Zhu T, Yu M. Association between preoperative lipid profiles and new-onset diabetes after transplantation in Chinese kidney transplant recipients: A retrospective cohort study. J Clin Lab Anal 2021; 35:e23867. [PMID: 34101909 PMCID: PMC8373348 DOI: 10.1002/jcla.23867] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 04/28/2021] [Accepted: 05/22/2021] [Indexed: 02/06/2023] Open
Abstract
Background This study investigated the association between the preoperative lipid profiles and new‐onset diabetes after transplantation (NODAT) in Chinese kidney transplant recipients (KTRs). Methods In this study, of 1140 KTRs registered between January 1993 and March 2018 in Zhongshan Hospital, Fudan University, 449 were enrolled. Clinical data, obtained through a chart review of the patient records in the medical record system, were evaluated, and NODAT was diagnosed based on the American Diabetes Association guidelines. Multivariate Cox regression analysis was conducted to determine whether the preoperative lipid profiles in KTRs were independently associated with NODAT incidence. The preoperative lipid profiles were analyzed as continuous variables and grouped into tertiles. Smooth curve fitting was used to confirm the linear associations. Results During a median follow‐up of 28.03 (interquartile range 12.00–84.23) months, 104 of the 449 (23.16%) participants developed NODAT. The multivariate model analysis, adjusted for all potential covariates, showed that increased values of the following parameters were associated with NODAT (hazard ratio, 95% confidence interval): preoperative total cholesterol (TC; 1.25, 1.09–1.58, p = 0.0495), low‐density lipoprotein cholesterol (LDL‐C; 1.33, 1.02–1.75, p = 0.0352), non‐high‐density lipoprotein cholesterol (non‐HDL‐C; 1.41, 1.09–1.82, p = 0.0084), TC/HDL‐C (1.28, 1.06–1.54, p = 0.0109), and non‐HDL‐C/HDL‐C (1.26, 1.05–1.52, p = 0.0138). However, the association between the preoperative triglyceride, HDL‐C, or TG/HDL‐C and NODAT was not significant. Conclusions Preoperative TC, LDL‐C, non‐HDL‐C, TC/HDL‐C, and non‐HDL‐C/HDL‐C were independent risk factors for NODAT.
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Affiliation(s)
- Yangli Ye
- Department of Endocrinology and Metabolism, Zhongshan Hospital, Fudan University, Shanghai, P.R. China
| | - Jian Gao
- Center of Clinical Epidemiology and Evidence-based Medicine, Fudan University, Shanghai, P.R. China
| | - Jing Liang
- Department of Endocrinology and Metabolism, Zhongshan Hospital, Fudan University, Shanghai, P.R. China
| | - Yinqiu Yang
- Department of Endocrinology and Metabolism, Zhongshan Hospital, Fudan University, Shanghai, P.R. China
| | - Chaoyang Lv
- Department of Endocrinology and Metabolism, Zhongshan Hospital, Fudan University, Shanghai, P.R. China.,Department of Geriatric Endocrinology, Zhengzhou Seventh People's Hospital, Henan, P.R. China
| | - Minling Chen
- Department of Endocrinology and Metabolism, Zhongshan Hospital, Fudan University, Shanghai, P.R. China.,Departments of Endocrinology and Metabolism, People's Hospital Affiliated to Fujian University of Traditional Chinese Medicine (The People's Hospital of Fujian Province, Fuzhou, P.R. China
| | - Jina Wang
- Department of Urology, Shanghai Key Laboratory of Organ Transplantation, Zhongshan Hospital, Fudan University, Shanghai, P.R. China
| | - Dong Zhu
- Department of Urology, Shanghai Key Laboratory of Organ Transplantation, Zhongshan Hospital, Fudan University, Shanghai, P.R. China
| | - Ruiming Rong
- Department of Urology, Shanghai Key Laboratory of Organ Transplantation, Zhongshan Hospital, Fudan University, Shanghai, P.R. China
| | - Ming Xu
- Department of Urology, Shanghai Key Laboratory of Organ Transplantation, Zhongshan Hospital, Fudan University, Shanghai, P.R. China
| | - Tongyu Zhu
- Department of Urology, Shanghai Key Laboratory of Organ Transplantation, Zhongshan Hospital, Fudan University, Shanghai, P.R. China
| | - Mingxiang Yu
- Department of Endocrinology and Metabolism, Zhongshan Hospital, Fudan University, Shanghai, P.R. China
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Wijesekara N, Gonçalves RA, Ahrens R, Ha K, De Felice FG, Fraser PE. Combination of human tau and islet amyloid polypeptide exacerbates metabolic dysfunction in transgenic mice. J Pathol 2021; 254:244-253. [PMID: 33797777 DOI: 10.1002/path.5674] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 03/07/2021] [Accepted: 03/29/2021] [Indexed: 11/07/2022]
Abstract
Amyloid plaques and neurofibrillary tangles composed of hyperphosphorylated tau are important contributors to Alzheimer's disease (AD). Tau also impacts pancreatic beta cell function and glucose homeostasis. Amyloid deposits composed of islet amyloid polypeptide (IAPP) are a pathological feature of type 2 diabetes (T2D). The current study investigates the role of human tau (hTau) in combination with human IAPP (hIAPP) as a potential mechanism connecting AD and T2D. Transgenic mice expressing hTau and hIAPP in the absence of murine tau were generated to determine the impact of these pathological factors on glucose metabolism. Co-expression of hIAPP and hTau resulted in mice with increased hyperglycaemia, insulin resistance, and glucose intolerance. The hTau-hIAPP mice also exhibited reduced beta cell area, increased amyloid deposition, impaired insulin processing, and reduced insulin content in islets. Tau phosphorylation also increased after stimulation with high glucose. In addition, brain insulin content and signalling were reduced, and tau phosphorylation was increased in these animals. These data support a link between tau and IAPP amyloid, which seems to act co-ordinately to impair beta cell function and glucose homeostasis, and suggest that the combined pathological actions of these proteins may be a potential mechanism connecting AD and T2D. © 2021 The Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Nadeeja Wijesekara
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, Canada
| | - Rafaella Araujo Gonçalves
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, Canada
- Centre for Neuroscience Studies and Department of Psychiatry, Queen's University, Kingston, Canada
| | - Rosemary Ahrens
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, Canada
| | - Kathy Ha
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, Canada
| | - Fernanda G De Felice
- Centre for Neuroscience Studies and Department of Psychiatry, Queen's University, Kingston, Canada
- Institute of Medical Biochemistry Leopoldo de Meis, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Paul E Fraser
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, Canada
- Department of Medical Biophysics, University of Toronto, Toronto, Canada
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Yoon HY, Lee MH, Song Y, Yee J, Song G, Gwak HS. ABCA1 69C>T Polymorphism and the Risk of Type 2 Diabetes Mellitus: A Systematic Review and Updated Meta-Analysis. Front Endocrinol (Lausanne) 2021; 12:639524. [PMID: 33967955 PMCID: PMC8104122 DOI: 10.3389/fendo.2021.639524] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Accepted: 04/06/2021] [Indexed: 12/14/2022] Open
Abstract
Background The ATP-binding cassette transporter A1 (ABCA1) is likely associated with the risk of type 2 diabetes mellitus (T2DM) via β cell function modification, but the evidence on the association remains unclear. This study aimed to investigate the relationship between the ABCA1 69C>T polymorphism and the risk of T2DM through a systematic review and meta-analysis. Materials and Methods The PubMed, Web of Science, and Embase databases were searched for qualified studies published until August 2020. Studies that included the association between the ABCA1 69C>T polymorphism and the risk of T2DM were reviewed. The odds ratios (ORs) and 95% confidence intervals (CIs) were evaluated. Results We analyzed data from a total of 10 studies involving 17,742 patients. We found that the CC or CT genotype was associated with increased risk of T2DM than the TT genotype (OR, 1.41; 95% CI, 1.02-1.93). In the Asian population, the C allele carriers had a higher risk of T2DM than those with the TT genotype; the ORs of the CC and CT genotypes were 1.80 (95% CI, 1.21-2.68) and 1.61 (95% CI, and 1.29-2.01), respectively. Conclusions This meta-analysis confirmed that the ABCA1 69C>T genotype showed a decrease risk of T2DM compared to the CC or CT genotypes.
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Affiliation(s)
| | | | | | | | | | - Hye Sun Gwak
- College of Pharmacy and Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul, South Korea
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Templin AT, Mellati M, Soininen R, Hogan MF, Esser N, Castillo JJ, Zraika S, Kahn SE, Hull RL. Loss of perlecan heparan sulfate glycosaminoglycans lowers body weight and decreases islet amyloid deposition in human islet amyloid polypeptide transgenic mice. Protein Eng Des Sel 2020; 32:95-102. [PMID: 31769491 DOI: 10.1093/protein/gzz041] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 09/24/2019] [Accepted: 10/01/2019] [Indexed: 11/14/2022] Open
Abstract
Islet amyloid is a pathologic feature of type 2 diabetes (T2D) that is associated with β-cell loss and dysfunction. These amyloid deposits form via aggregation of the β-cell secretory product islet amyloid polypeptide (IAPP) and contain other molecules including the heparan sulfate proteoglycan perlecan. Perlecan has been shown to bind amyloidogenic human IAPP (hIAPP) via its heparan sulfate glycosaminoglycan (HS GAG) chains and to enhance hIAPP aggregation in vitro. We postulated that reducing the HS GAG content of perlecan would also decrease islet amyloid deposition in vivo. hIAPP transgenic mice were crossed with Hspg2Δ3/Δ3 mice harboring a perlecan mutation that prevents HS GAG attachment (hIAPP;Hspg2Δ3/Δ3), and male offspring from this cross were fed a high fat diet for 12 months to induce islet amyloid deposition. At the end of the study body weight, islet amyloid area, β-cell area, glucose tolerance and insulin secretion were analyzed. hIAPP;Hspg2Δ3/Δ3 mice exhibited significantly less islet amyloid deposition and greater β-cell area compared to hIAPP mice expressing wild type perlecan. hIAPP;Hspg2Δ3/Δ3 mice also gained significantly less weight than other genotypes. When adjusted for differences in body weight using multiple linear regression modeling, we found no differences in islet amyloid deposition or β-cell area between hIAPP transgenic and hIAPP;Hspg2Δ3/Δ3 mice. We conclude that loss of perlecan exon 3 reduces islet amyloid deposition in vivo through indirect effects on body weight and possibly also through direct effects on hIAPP aggregation. Both of these mechanisms may promote maintenance of glucose homeostasis in the setting of T2D.
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Affiliation(s)
- Andrew T Templin
- Division of Metabolism, Endocrinology and Nutrition, Veterans Affairs Puget Sound Health Care System and University of Washington, 1660 South Columbian Way, Seattle, 98108, Washington, USA
| | - Mahnaz Mellati
- Division of Metabolism, Endocrinology and Nutrition, Veterans Affairs Puget Sound Health Care System and University of Washington, 1660 South Columbian Way, Seattle, 98108, Washington, USA
| | - Raija Soininen
- Oulu Center for Cell-Matrix Research, Biocenter Oulu and Faculty of Biochemistry and Molecular Medicine, University of Oulu, Pentti Kaiteran Katu 1, Linnanmaa, Oulu, Finland
| | - Meghan F Hogan
- Division of Metabolism, Endocrinology and Nutrition, Veterans Affairs Puget Sound Health Care System and University of Washington, 1660 South Columbian Way, Seattle, 98108, Washington, USA
| | - Nathalie Esser
- Division of Metabolism, Endocrinology and Nutrition, Veterans Affairs Puget Sound Health Care System and University of Washington, 1660 South Columbian Way, Seattle, 98108, Washington, USA
| | - J Josh Castillo
- Division of Metabolism, Endocrinology and Nutrition, Veterans Affairs Puget Sound Health Care System and University of Washington, 1660 South Columbian Way, Seattle, 98108, Washington, USA
| | - Sakeneh Zraika
- Division of Metabolism, Endocrinology and Nutrition, Veterans Affairs Puget Sound Health Care System and University of Washington, 1660 South Columbian Way, Seattle, 98108, Washington, USA
| | - Steven E Kahn
- Division of Metabolism, Endocrinology and Nutrition, Veterans Affairs Puget Sound Health Care System and University of Washington, 1660 South Columbian Way, Seattle, 98108, Washington, USA
| | - Rebecca L Hull
- Division of Metabolism, Endocrinology and Nutrition, Veterans Affairs Puget Sound Health Care System and University of Washington, 1660 South Columbian Way, Seattle, 98108, Washington, USA
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10
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Jia Y, Wang N, Zhang Y, Xue D, Lou H, Liu X. Alteration in the Function and Expression of SLC and ABC Transporters in the Neurovascular Unit in Alzheimer's Disease and the Clinical Significance. Aging Dis 2020; 11:390-404. [PMID: 32257549 PMCID: PMC7069460 DOI: 10.14336/ad.2019.0519] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 05/19/2019] [Indexed: 12/17/2022] Open
Abstract
The neurovascular unit (NVU) plays an important role in maintaining the function of the central nervous system (CNS). Emerging evidence has indicated that the NVU changes function and molecules at the early stage of Alzheimer’s disease (AD), which initiates multiple pathways of neurodegeneration. Cell types in the NVU have become attractive targets in the interventional treatment of AD. The NVU transportation system contains a variety of proteins involved in compound transport and neurotransmission. Brain transporters can be classified as members of the solute carrier (SLC) and ATP-binding cassette (ABC) families in the NVU. Moreover, the transporters can regulate both endogenous toxins, including amyloid-beta (Aβ) and xenobiotic homeostasis, in the brains of AD patients. Genome-wide association studies (GWAS) have identified some transporter gene variants as susceptibility loci for late-onset AD. Therefore, the present study summarizes changes in blood-brain barrier (BBB) permeability in AD, identifies the location of SLC and ABC transporters in the brain and focuses on major SLC and ABC transporters that contribute to AD pathology.
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Affiliation(s)
- Yongming Jia
- 1Department of Neuropharmacology, College of Pharmacy, Qiqihar Medical University, Qiqihar, China
| | - Na Wang
- 2Department of Pathophysiology, Basic Medical Science College, Qiqihar Medical University, Qiqihar, China
| | - Yingbo Zhang
- 3College of Pathology, Qiqihar Medical University, Qiqihar, China
| | - Di Xue
- 1Department of Neuropharmacology, College of Pharmacy, Qiqihar Medical University, Qiqihar, China
| | - Haoming Lou
- 4Department of Medicinal Chemistry and Chemistry of Chinese Materia Medica, School of Pharmacy, Changchun University of Chinese Medicine, Changchun, China
| | - Xuewei Liu
- 1Department of Neuropharmacology, College of Pharmacy, Qiqihar Medical University, Qiqihar, China
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Rosado JA, Diez-Bello R, Salido GM, Jardin I. Fine-tuning of microRNAs in Type 2 Diabetes Mellitus. Curr Med Chem 2019; 26:4102-4118. [PMID: 29210640 DOI: 10.2174/0929867325666171205163944] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 11/23/2017] [Accepted: 11/23/2017] [Indexed: 12/13/2022]
Abstract
Type 2 diabetes mellitus is a metabolic disease widely spread across industrialized countries. Sedentary lifestyle and unhealthy alimentary habits lead to obesity, boosting both glucose and fatty acid in the bloodstream and eventually, insulin resistance, pancreas inflammation and faulty insulin production or secretion, all of them very well-defined hallmarks of type 2 diabetes mellitus. miRNAs are small sequences of non-coding RNA that may regulate several processes within the cells, fine-tuning protein expression, with an unexpected and subtle precision and in time-frames ranging from minutes to days. Since the discovery of miRNA and their possible implication in pathologies, several groups aimed to find a relationship between type 2 diabetes mellitus and miRNAs. Here we discuss the pattern of expression of different miRNAs in cultured cells, animal models and diabetic patients. We summarize the role of the most important miRNAs involved in pancreas growth and development, insulin secretion and liver, skeletal muscle or adipocyte insulin resistance in the context of type 2 diabetes mellitus.
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Affiliation(s)
- Juan A Rosado
- Institute of Molecular Pathology Biomarkers & Department of Physiology (Cell Physiology Research Group), University of Extremadura, 10003-Caceres, Spain
| | - Raquel Diez-Bello
- Institute of Molecular Pathology Biomarkers & Department of Physiology (Cell Physiology Research Group), University of Extremadura, 10003-Caceres, Spain
| | - Ginés M Salido
- Institute of Molecular Pathology Biomarkers & Department of Physiology (Cell Physiology Research Group), University of Extremadura, 10003-Caceres, Spain
| | - Isaac Jardin
- Institute of Molecular Pathology Biomarkers & Department of Physiology (Cell Physiology Research Group), University of Extremadura, 10003-Caceres, Spain
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Vahdat Shariat Panahi A, Hultman P, Öllinger K, Westermark GT, Lundmark K. Lipid membranes accelerate amyloid formation in the mouse model of AA amyloidosis. Amyloid 2019; 26:34-44. [PMID: 30929476 DOI: 10.1080/13506129.2019.1576606] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
INTRODUCTION AA amyloidosis develops as a result of prolonged inflammation and is characterized by deposits of N-terminal proteolytic fragments of the acute phase reactant serum amyloid A (SAA). Macrophages are usually found adjacent to amyloid, suggesting their involvement in the formation and/or degradation of the amyloid fibrils. Furthermore, accumulating evidence suggests that lipid membranes accelerate the fibrillation of different amyloid proteins. METHODS Using an experimental mouse model of AA amyloidosis, we compared the amyloidogenic effect of liposomes and/or amyloid-enhancing factor (AEF). Inflammation was induced by subcutaneous injection of silver nitrate followed by intravenous injection of liposomes and/or AEF to accelerate amyloid formation. RESULTS We showed that liposomes accelerate amyloid formation in inflamed mice, but the amyloidogenic effect of liposomes was weaker compared with AEF. Regardless of the induction method, amyloid deposits were mainly found in the marginal zones of the spleen and coincided with the depletion of marginal zone macrophages, while red pulp macrophages and metallophilic marginal zone macrophages proved insensitive to amyloid deposition. CONCLUSIONS We conclude that increased intracellular lipid content facilitates AA amyloid fibril formation and show that the mouse model of AA amyloidosis is a suitable system for further mechanistic studies.
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Affiliation(s)
- Aida Vahdat Shariat Panahi
- a Experimental Pathology, Department of Clinical and Experimental Medicine , Linköping University , Linköping , Sweden.,b Departments of Clinical Pathology and Clinical and Experimental Medicine , Linköping University , Linköping , Sweden
| | - Per Hultman
- c Molecular and Immunological Pathology, Department of Clinical and Experimental Medicine , Linköping University , Linköping , Sweden
| | - Karin Öllinger
- a Experimental Pathology, Department of Clinical and Experimental Medicine , Linköping University , Linköping , Sweden
| | | | - Katarzyna Lundmark
- a Experimental Pathology, Department of Clinical and Experimental Medicine , Linköping University , Linköping , Sweden.,b Departments of Clinical Pathology and Clinical and Experimental Medicine , Linköping University , Linköping , Sweden
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13
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Hao R, Li Y, Guan L, Lu T, Meng F, Wang C, Li F. Cholesterol-sensing role of phenylalanine in the interaction of human islet amyloid polypeptide with lipid bilayers. RSC Adv 2018; 8:40581-40588. [PMID: 35557876 PMCID: PMC9091444 DOI: 10.1039/c8ra07310d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Accepted: 11/21/2018] [Indexed: 11/23/2022] Open
Abstract
The interactions between hIAPP and the pancreatic β-cells are associated with β-cell death in type II diabetes. Cholesterol modulates hIAPP-membrane interaction and hIAPP aggregation. The molecular mechanism underlying this is not well understood. Here we explore the cholesterol-sensing role of F15 in the interactions of hIAPP and hIAPP1-19 with various compositions of lipids, including DOPC, DPPC and DOPC/DPPC using NMR, CD, ThT fluorescence and dye leakage assays. We show that both hIAPP and hIAPP1-19 are more potent in the disruption to the membranes with cholesterol than they are in the disruption to the membranes without cholesterol. A substitution of F15 by leucine affects the binding and disruption of the peptides to the membranes slightly in the absence of cholesterol, but decreases the activities largely in the presence of cholesterol. F15 also plays a role in accelerating fibrillar assembly of hIAPP, but the function is independent of cholesterol in nature. The promotion of cholesterol to the disruptive potency of hIAPP is more effective in the membrane with raft-like domains than in the membrane with a dispersed distribution of cholesterol. Our results suggest that F15 plays a key role in the cholesterol-sensing binding and disruption of hIAPP to the PC membranes and the distribution of cholesterol in the membranes has an influence on the disruptive activity of hIAPP.
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Affiliation(s)
- Ruijie Hao
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University 2699 Qianjin Avenue Changchun 130012 P. R. China
| | - Yang Li
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University 2699 Qianjin Avenue Changchun 130012 P. R. China
| | - Liping Guan
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University 2699 Qianjin Avenue Changchun 130012 P. R. China
| | - Tong Lu
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University 2699 Qianjin Avenue Changchun 130012 P. R. China
| | - Feihong Meng
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University 2699 Qianjin Avenue Changchun 130012 P. R. China
| | - Chunyu Wang
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University 2699 Qianjin Avenue Changchun 130012 P. R. China
| | - Fei Li
- State Key Laboratory of Supramolecular Structure and Materials, Jilin University 2699 Qianjin Avenue Changchun 130012 P. R. China
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IAPP in type II diabetes: Basic research on structure, molecular interactions, and disease mechanisms suggests potential intervention strategies. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018. [DOI: 10.1016/j.bbamem.2018.02.020] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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15
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IAPP/amylin and β-cell failure: implication of the risk factors of type 2 diabetes. Diabetol Int 2018; 9:143-157. [PMID: 30603362 DOI: 10.1007/s13340-018-0347-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Accepted: 01/21/2018] [Indexed: 12/12/2022]
Abstract
In type 2 diabetes (T2D), the most significant pathological change in pancreatic islets is amyloid deposits, of which a major component is islet amyloid polypeptide (IAPP), also called amylin. IAPP is expressed in β-cells and co-secreted with insulin. Together with the inhibitory effects of synthetic human IAPP (hIAPP) on insulin secretion, our studies, using hIAPP transgenic mice, in which glucose-stimulated insulin secretion was moderately reduced without amyloid deposit, and hIAPP gene-transfected β-cell lines, in which insulin secretion was markedly impaired without amyloid, predicted that soluble hIAPP-related molecules would exert cytotoxicity on β-cells. Human IAPP is one of the most aggregation-prone peptides that interact with cell membranes. While it is widely reported that soluble hIAPP oligomers promote cytotoxicity, this is still a hypothesis since the mechanisms are not yet fully defined. Several hIAPP transgenic mouse models did not develop diabetes; however, in models with backgrounds characterized for diabetic phenotypes, β-cell function and glucose tolerance did worsen, compared to those in non-transgenic models with similar backgrounds. Together with these findings, many studies on metabolic and molecular disorders induced by risk factors of T2D suggest that in T2D subjects, toxic IAPP oligomers accumulate in β-cells, impair their function, and reduce mass through disruption of cell membranes, resulting in β-cell failure. IAPP might be central to β-cell failure in T2D. Anti-amyloid aggregation therapeutics will be developed to create treatments with more durable and beneficial effects on β-cell function.
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Cheng B, Li Y, Ma L, Wang Z, Petersen RB, Zheng L, Chen Y, Huang K. Interaction between amyloidogenic proteins and biomembranes in protein misfolding diseases: Mechanisms, contributors, and therapy. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2018; 1860:1876-1888. [PMID: 29466701 DOI: 10.1016/j.bbamem.2018.02.013] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 02/12/2018] [Accepted: 02/13/2018] [Indexed: 12/14/2022]
Abstract
The toxic deposition of misfolded amyloidogenic proteins is associated with more than fifty protein misfolding diseases (PMDs), including Alzheimer's disease, Parkinson's disease and type 2 diabetes mellitus. Protein deposition is a multi-step process modulated by a variety of factors, in particular by membrane-protein interaction. The interaction results in permeabilization of biomembranes contributing to the cytotoxicity that leads to PMDs. Different biological and physiochemical factors, such as protein sequence, lipid composition, and chaperones, are known to affect the membrane-protein interaction. Here, we provide a comprehensive review of the mechanisms and contributing factors of the interaction between biomembranes and amyloidogenic proteins, and a summary of the therapeutic approaches to PMDs that target this interaction. This article is part of a Special Issue entitled: Protein Aggregation and Misfolding at the Cell Membrane Interface edited by Ayyalusamy Ramamoorthy.
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Affiliation(s)
- Biao Cheng
- Department of Pharmacy, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430023, China; Key Laboratory for Molecular Diagnosis of Hubei Province, The Central Hospital of Wuhan, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430023, China
| | - Yang Li
- Tongji School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Liang Ma
- Tongji School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Zhuoyi Wang
- Tongji School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Robert B Petersen
- Foundational Sciences, Central Michigan University College of Medicine, Mt. Pleasant, MI 48858, USA
| | - Ling Zheng
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences, Wuhan 430072, China
| | - Yuchen Chen
- Tongji School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Kun Huang
- Tongji School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
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Pulido-Capiz A, Díaz-Molina R, Martínez-Navarro I, Guevara-Olaya LA, Casanueva-Pérez E, Mas-Oliva J, Rivero IA, García-González V. Modulation of Amyloidogenesis Controlled by the C-Terminal Domain of Islet Amyloid Polypeptide Shows New Functions on Hepatocyte Cholesterol Metabolism. Front Endocrinol (Lausanne) 2018; 9:331. [PMID: 29988450 PMCID: PMC6026639 DOI: 10.3389/fendo.2018.00331] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Accepted: 05/31/2018] [Indexed: 12/30/2022] Open
Abstract
The islet amyloid polypeptide (IAPP) or amylin maintains a key role in metabolism. This 37-residues-peptide could form pancreatic amyloids, which are a characteristic feature of diabetes mellitus type 2. However, some species do not form amyloid fibril structures. By employing a biomimetic approach, we generated an extensive panel of optimized sequences of IAPP, which could drastically reduce aggregation propensity. A structural and cellular characterization analysis was performed on the C-terminal domain with the highest aggregation propensity. This allowed the observation of an aggregative phenomenon dependent of the lipid environment. Evaluation of the new F23R variant demonstrated inhibition of β-sheet structure and, therefore, amyloid formation on the native C-terminal, phenomenon that was associated with functional optimization in calcium and cholesterol management coupled with the optimization of insulin secretion by beta cells. When F23R variant was evaluated in microglia cells, a model of amyloidosis, cytotoxic conditions were not registered. In addition, it was found that C-terminal sequences of IAPP could modulate cholesterol metabolism in hepatocytes through regulation of SREBP-2, apoA-1, ABCA1, and LDLR, mechanism that may represent a new function of IAPP on the metabolism of cholesterol, increasing the LDL endocytosis in hepatocytes. Optimized sequences with only one residue modification in the C-terminal core aggregation could diminish β-sheet formation and represent a novel strategy adaptable to other pharmacological targets. Our data suggest a new IAPP function associated with rearrangements on metabolism of cholesterol in hepatocytes.
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Affiliation(s)
- Angel Pulido-Capiz
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali, Mexico
| | - Raúl Díaz-Molina
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali, Mexico
| | - Israel Martínez-Navarro
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali, Mexico
- Facultad de Enfermería, Universidad Autónoma de Baja California, Mexico City, Mexico
| | - Lizbeth A. Guevara-Olaya
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali, Mexico
| | - Enrique Casanueva-Pérez
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali, Mexico
| | - Jaime Mas-Oliva
- Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Ciudad de México, Mexico
| | - Ignacio A. Rivero
- Centro de Graduados e Investigación en Química, Instituto Tecnológico de Tijuana, Tijuana, Mexico
| | - Victor García-González
- Departamento de Bioquímica, Facultad de Medicina Mexicali, Universidad Autónoma de Baja California, Mexicali, Mexico
- *Correspondence: Victor García-González,
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Berberine-sonodynamic therapy induces autophagy and lipid unloading in macrophage. Cell Death Dis 2017; 8:e2558. [PMID: 28102849 PMCID: PMC5386349 DOI: 10.1038/cddis.2016.354] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2016] [Revised: 09/19/2016] [Accepted: 09/27/2016] [Indexed: 01/28/2023]
Abstract
Impaired autophagy in macrophages accompanies the progression of atherosclerosis and contributes to lipid loading in plaques and ineffective lipid degradation. Therefore, evoking autophagy and its associated cholesterol efflux may provide a therapeutic treatment for atherosclerosis. In the present study, berberine-mediated sonodynamic therapy (BBR-SDT) was used to induce autophagy and cholesterol efflux in THP-1 macrophages and derived foam cells. Following BBR-SDT, autophagy was increased in the macrophages, autophagy resistance in the foam cells was prevented, and cholesterol efflux was induced. The first two effects were blocked by the reactive oxygen species scavenger, N-acetyl cysteine. BBR-SDT also reduced the phosphorylation of Akt and mTOR, two key molecules in the PI3K/AKT/mTOR signaling pathway, which is responsible for inducing autophagy. Correspondingly, treatment with the autophagy inhibitor, 3-methyladenine, or the PI3K inhibitor, LY294002, abolished the autophagy-induced effects of BBR-SDT. Furthermore, induction of cholesterol efflux by BBR-SDT was reversed by an inhibition of autophagy by 3-methyladenine or by a small interfering RNA targeting Atg5. Taken together, these results demonstrate that BBR-SDT effectively promotes cholesterol efflux by increasing reactive oxygen species generation, and this subsequently induces autophagy via the PI3K/AKT/mTOR signaling pathway in both ‘normal' macrophages and lipid-loaded macrophages (foam cells). Thus, BBR-SDT may be a promising atheroprotective therapy to inhibit the progression of atherosclerosis and should be further studied.
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Zhang T, Zhou L, Li CC, Shi H, Zhou X. TSH increases synthesis of hepatic ATP-binding cassette subfamily A member 1 in hypercholesterolemia. Biochem Biophys Res Commun 2016; 476:75-81. [PMID: 27179782 DOI: 10.1016/j.bbrc.2016.05.054] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Accepted: 05/10/2016] [Indexed: 10/21/2022]
Abstract
Epidemiological evidence suggests that thyrotropin (TSH) levels are closely correlated with the severity of hypercholesterolemia. Reverse cholesterol transfer (RCT) plays an important role in regulating bloodcholesterol. However, the molecular mechanism of hypercholesterolemia in subclinical hypothyroidism (SCH) has not been fully clarified. The SCH mouse model, which is characterized by elevated serum TSH but not thyroid hormone levels, demonstrated a significant increase in plasma cholesterol compared with controls. Interestingly, Tshr KO mice, with normal thyroid hormone levels after thyroid hormone supplementation, showed lower plasma cholesterol levels compared with their wild-type littermates. ATP binding cassette subfamily A member 1(ABCA1) is a member of the ABC superfamily, which induces transfer of intracellular cholesterol to extracellular apolipoprotein. TSH upregulated hepatic ABCA1 to promote the efflux of intercellular cumulative cholesterol, resulting in increased plasma cholesterol. These data might partially explain the pathogenesis of hypercholesterolemia in SCH.
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Affiliation(s)
- Tiantian Zhang
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong University, Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, China
| | - Lingyan Zhou
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong University, Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, China
| | - Cong Cong Li
- Jinan Central Hospital affiliated to Shandong University, Jinan, Shandong, 250021, China
| | - Hong Shi
- Department of Pediatrics, The Second Affiliated Hospital of Shandong University of Traditional Chinese Medicine, China
| | - Xinli Zhou
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong University, Shandong Clinical Medical Center of Endocrinology and Metabolism, Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, China.
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