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Brampton C, Pomozi V, Le Corre Y, Zoll J, Kauffenstein G, Ma C, Hoffmann PR, Martin L, Le Saux O. Bone Marrow-Derived ABCC6 Is an Essential Regulator of Ectopic Calcification In Pseudoxanthoma Elasticum. J Invest Dermatol 2024; 144:1772-1783.e3. [PMID: 38367909 PMCID: PMC11260544 DOI: 10.1016/j.jid.2024.01.026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 12/31/2023] [Accepted: 01/26/2024] [Indexed: 02/19/2024]
Abstract
Physiological calcification of soft tissues is a common occurrence in aging and various acquired and inherited disorders. ABCC6 sequence variations cause the calcification phenotype of pseudoxanthoma elasticum (PXE) as well as some cases of generalized arterial calcification of infancy, which is otherwise caused by defective ENPP1. ABCC6 is primarily expressed in the liver, which has given the impression that the liver is central to the pathophysiology of PXE/generalized arterial calcification of infancy. The emergence of inflammation as a contributor to the calcification in PXE suggested that peripheral tissues play a larger role than expected. In this study, we investigated whether bone marrow-derived ABCC6 contributes to the calcification in PXE. In Abcc6‒/‒ mice, we observed prevalent mineralization in several lymph nodes and surrounding connective tissues and an extensive network of lymphatic vessels within vibrissae, a calcified tissue in Abcc6‒/‒ mice. Furthermore, we found evidence of lymphangiogenesis in patients with PXE and mouse skin, suggesting an inflammatory process. Finally, restoring wild-type bone marrow in Abcc6‒/‒ mice produced a significant reduction of calcification, suggesting that the liver alone is not sufficient to fully inhibit mineralization. With evidence that ABCC6 is expressed in lymphocytes, we suggest that the adaptative immune system and inflammation largely contribute to the calcification in PXE/generalized arterial calcification of infancy.
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Affiliation(s)
- Christopher Brampton
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA; Bio-Rad Laboratories, Hercules, California, USA
| | - Viola Pomozi
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA; Institute of Enzymology, Research Center for Natural Sciences, Hungarian Academy of Sciences Centre of Excellence, Budapest, Hungary
| | - Yannick Le Corre
- PXE National Reference Center (MAGEC Nord), University Hospital of Angers, Angers, France
| | - Janna Zoll
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
| | - Gilles Kauffenstein
- UMR INSERM 1260, Nano Regenerative Medicine, University of Strasbourg, Strasbourg, France
| | - Chi Ma
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
| | - Peter R Hoffmann
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
| | - Ludovic Martin
- PXE National Reference Center (MAGEC Nord), University Hospital of Angers, Angers, France; CNRS 6015, UMR INSERM U1083, MITOVASC Laboratory, University of Angers, Angers, France
| | - Olivier Le Saux
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA.
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Kauffenstein G, Martin L, Le Saux O. The Purinergic Nature of Pseudoxanthoma Elasticum. BIOLOGY 2024; 13:74. [PMID: 38392293 PMCID: PMC10886499 DOI: 10.3390/biology13020074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 01/13/2024] [Accepted: 01/19/2024] [Indexed: 02/24/2024]
Abstract
Pseudoxanthoma Elasticum (PXE) is an inherited disease characterized by elastic fiber calcification in the eyes, the skin and the cardiovascular system. PXE results from mutations in ABCC6 that encodes an ABC transporter primarily expressed in the liver and kidneys. It took nearly 15 years after identifying the gene to better understand the etiology of PXE. ABCC6 function facilitates the efflux of ATP, which is sequentially hydrolyzed by the ectonucleotidases ENPP1 and CD73 into pyrophosphate (PPi) and adenosine, both inhibitors of calcification. PXE, together with General Arterial Calcification of Infancy (GACI caused by ENPP1 mutations) as well as Calcification of Joints and Arteries (CALJA caused by NT5E/CD73 mutations), forms a disease continuum with overlapping phenotypes and shares steps of the same molecular pathway. The explanation of these phenotypes place ABCC6 as an upstream regulator of a purinergic pathway (ABCC6 → ENPP1 → CD73 → TNAP) that notably inhibits mineralization by maintaining a physiological Pi/PPi ratio in connective tissues. Based on a review of the literature and our recent experimental data, we suggest that PXE (and GACI/CALJA) be considered as an authentic "purinergic disease". In this article, we recapitulate the pathobiology of PXE and review molecular and physiological data showing that, beyond PPi deficiency and ectopic calcification, PXE is associated with wide and complex alterations of purinergic systems. Finally, we speculate on the future prospects regarding purinergic signaling and other aspects of this disease.
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Affiliation(s)
- Gilles Kauffenstein
- UMR INSERM 1260, Regenerative Nanomedicine, University of Strasbourg, 67084 Strasbourg, France
| | - Ludovic Martin
- PXE Consultation Center, MAGEC Nord Reference Center for Rare Skin Diseases, Angers University Hospital, 49000 Angers, France
- MITOVASC-UMR CNRS 6015 INSERM 1083, University of Angers, 49000 Angers, France
| | - Olivier Le Saux
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI 96822, USA
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Javan-Khoshkholgh A, Sassoon JC, Behbodikhah J, Dai W, Alemu S, Quadri S, Singh M, Savinova OV, Farajidavar A. Recording and analysis of slow waves of the small intestine of mice with heart failure. Neurogastroenterol Motil 2023; 35:e14514. [PMID: 36480434 DOI: 10.1111/nmo.14514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 10/18/2022] [Accepted: 11/23/2022] [Indexed: 02/08/2023]
Abstract
BACKGROUND Gastrointestinal (GI) symptoms in heart failure (HF) patients are associated with increased morbidity and mortality. We hypothesized that HF reduces bioelectrical activity underlying peristalsis. In this study, we aimed to establish a method to capture and analyze slow waves (SW) in the small intestine in mice with HF. METHODS We established a model of HF secondary to coronary artery disease in mice overexpressing tissue-nonspecific alkaline phosphatase (TNAP) in endothelial cells. The myoelectric activity was recorded from the small intestine in live animals under anesthesia. The low- and high-frequency components of SW were isolated in MATLAB and compared between the control (n = 12) and eTNAP groups (n = 8). C-kit-positive interstitial cells of Cajal (ICC) and Pgp9.5-positive myenteric neurons were detected by immunofluorescence. Myenteric ganglia were assessed by hematoxylin and eosin (H&E) staining. RESULTS SW activity was successfully captured in vivo, with both high- and low-frequency components. Low-frequency component of SW was not different between endothelial TNAP (eTNAP) and control mice (mean[95% CI]: 0.032[0.025-0.039] vs. 0.040[0.028-0.052]). High-frequency component of SW showed a reduction eTNAP mice relative to controls (0.221[0.140-0.302] vs. 0.394[0.295-0.489], p < 0.01). Dysrhythmia was also apparent upon visual review of signals. The density of ICC and neuronal networks remained the same between the two groups. No significant reduction in the size of myenteric ganglia of eTNAP mice was observed. CONCLUSIONS A method to acquire SW activity from small intestines in vivo and isolate low- and high-frequency components was established. The results indicate that HF might be associated with reduced high-frequency SW activity.
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Affiliation(s)
- Amir Javan-Khoshkholgh
- Department of Materials Science and Biomedical Engineering, University of Wisconsin - Eau Claire, Eau Claire, Wisconsin, USA
| | - Joseph C Sassoon
- College of Engineering and Computing Sciences, Department of Electrical and Computer Engineering, New York Institute of Technology, Old Westbury, New York, USA
| | - Jennifer Behbodikhah
- College of Osteopathic Medicine, Department of Biomedical Sciences, New York Institute of Technology, Old Westbury, New York, USA
| | - Wenchen Dai
- College of Engineering and Computing Sciences, Department of Electrical and Computer Engineering, New York Institute of Technology, Old Westbury, New York, USA
| | - Senayt Alemu
- College of Osteopathic Medicine, Department of Biomedical Sciences, New York Institute of Technology, Old Westbury, New York, USA
| | - Saad Quadri
- College of Osteopathic Medicine, Department of Biomedical Sciences, New York Institute of Technology, Old Westbury, New York, USA
| | - Mohnish Singh
- College of Osteopathic Medicine, Department of Biomedical Sciences, New York Institute of Technology, Old Westbury, New York, USA
| | - Olga V Savinova
- College of Osteopathic Medicine, Department of Biomedical Sciences, New York Institute of Technology, Old Westbury, New York, USA
| | - Aydin Farajidavar
- College of Engineering and Computing Sciences, Department of Electrical and Computer Engineering, New York Institute of Technology, Old Westbury, New York, USA
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Morikane S, Ishida K, Taniguchi T, Ashizawa N, Matsubayashi M, Kurita N, Kobashi S, Iwanaga T. Identification of a DBA/2 Mouse Sub-strain as a Model for Pseudoxanthoma Elasticum-Like Tissue Calcification. Biol Pharm Bull 2023; 46:1737-1744. [PMID: 38044132 DOI: 10.1248/bpb.b23-00478] [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] [Indexed: 12/05/2023]
Abstract
Ectopic calcification in the cardiovascular system adversely affects life prognosis. DBA/2 mice experience calcification owing to low expression of Abcc6 as observed in pseudoxanthoma elasticum (PXE) patients; however, little is known about its characteristics as a calcification model. In this study, we explore the suitability of a DBA/2 sub-strain as a PXE-like tissue calcification model, and the effect of a bisphosphonate which prevents calcification of soft tissues in hypercalcemic models was evaluated. The incidence of calcification of the heart was compared among several sub-strains and between both sexes of DBA/2 mice. mRNA expression of calcification-related genes was compared with DBA/2 sub-strains and other mouse strains. In addition, progression of calcification and calciprotein particle formation in serum were examined. Among several sub-strains of DBA/2 mice, male DBA/2CrSlc mice showed the most remarkable cardiac calcification. In DBA/2CrSlc mice, expression of the anti-calcifying genes Abcc6, Enpp1 and Spp1 was lower than that in C57BL/6J, and expression of Enpp1 and Spp1 was lower compared with other sub-strains. Calcification was accompanied by accelerated formation of calciprotein particle, which was prevented by daily treatment with bisphosphonate. A model suitable for ectopic calcification was identified by choosing a sub-strain of DBA/2 mice, in which genetic characteristics would contribute to extended calcification.
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Li B, Liu Q, Chen X, Chen T, Dang W, Zhao J, Cui G, Chen K, Wu Y. A Novel Idiopathic Atrial Calcification: Pathologic Manifestations and Potential Mechanism. Front Cardiovasc Med 2022; 9:788958. [PMID: 35387434 PMCID: PMC8978529 DOI: 10.3389/fcvm.2022.788958] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 02/24/2022] [Indexed: 11/13/2022] Open
Abstract
Background Cardiac calcification is a type of ectopic pathologic calcification of unknown etiology and mechanisms. Once diagnosed, the location, extent and morphology of the calcified lesions, as well as their functional significance in the heart, are usually the focus of case reports. Calcification is mostly distributed in myocardium, but rarely reported in atrium. In addition, because of limited sampling and complex pathological mechanisms, the etiology underlying the formation of these calcified lesions also remains unclear. Methods Two cardiac calcifications were found in a patient, died of trauma-induced subarachnoid hemorrhage after slightly drinking, during a standard autopsy. The location and morphological characteristics of the calcified lesions were determined by computed tomography (CT) and CT-based 3D reconstruction. The specific histopathological characteristics of the lesions were determined by multi-staining. The concentration of free calcium and inorganic pyrophosphate (PPi) in plasma reflected the change of calcium metabolism. The expression and membranal localization of the ATP Binding Cassette Subfamily C Member 6 (ABCC6) in hepatocytes were detected by immunofluorescence. The variants of the ABCC6 were detected by Sanger sequencing and potential pathogenic variants were further identified by in silico analysis. Results The present study describes a patient with idiopathic calcification with two pear-shaped and irregularly hollow lesions symmetrically distributed in the patient's atrium. Massive accumulation of calcium salts was identified by multi-staining. For this patient, the plasma concentration of free calcium was higher than the control, indicating that calcium metabolism was disturbed. Furthermore, the plasma PPi of the patient was lower than the normal. By using immunofluorescence, the expression and membranal localization of ABCC6 was decreased and impaired in hepatocytes, respectively. Combined with Sanger sequencing and in silico analysis, 7 variants were identified. Conclusions This study described a novel patient with symmetrically distributed idiopathic atrial calcifications. Furthermore, all the results indicated that these pathologic calcifications may be secondary to reduced plasma PPi content due to ABCC6 dysfunction in hepatocytes. Moreover, these findings provided novel clues to the pathogenesis, clinical diagnosis and treatment of idiopathic atrial calcification in future.
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Affiliation(s)
- Bowen Li
- Department of Biochemistry and Molecular Biology, Air Force Medical University, Xi'an, China
- Shaanxi Junda Forensic Medicine Expertise Station, Air Force Medical University, Xi'an, China
| | - Qingbo Liu
- Shaanxi Junda Forensic Medicine Expertise Station, Air Force Medical University, Xi'an, China
| | - Xihui Chen
- Department of Biochemistry and Molecular Biology, Air Force Medical University, Xi'an, China
- Shaanxi Junda Forensic Medicine Expertise Station, Air Force Medical University, Xi'an, China
| | - Tangdong Chen
- Department of Biochemistry and Molecular Biology, Air Force Medical University, Xi'an, China
- Shaanxi Junda Forensic Medicine Expertise Station, Air Force Medical University, Xi'an, China
| | - Wenhui Dang
- Shaanxi Junda Forensic Medicine Expertise Station, Air Force Medical University, Xi'an, China
| | - Jing Zhao
- Shaanxi Junda Forensic Medicine Expertise Station, Air Force Medical University, Xi'an, China
| | - Guangbin Cui
- Department of Radiology & Functional and Molecular Imaging Key Lab of Shaanxi Province, Tangdu Hospital, Air Force Medical University, Xi'an, China
- Guangbin Cui
| | - Kun Chen
- Department of Anatomy, Histology and Embryology and K.K. Leung Brain Research Centre, Air Force Medical University, Xi'an, China
- Kun Chen
| | - Yuanming Wu
- Department of Biochemistry and Molecular Biology, Air Force Medical University, Xi'an, China
- Shaanxi Junda Forensic Medicine Expertise Station, Air Force Medical University, Xi'an, China
- *Correspondence: Yuanming Wu
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Vilmundarson RO, Duong A, Soheili F, Chen HH, Stewart AFR. IRF2BP2 3'UTR Polymorphism Increases Coronary Artery Calcification in Men. Front Cardiovasc Med 2021; 8:687645. [PMID: 34760935 PMCID: PMC8573268 DOI: 10.3389/fcvm.2021.687645] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 09/28/2021] [Indexed: 12/15/2022] Open
Abstract
Interferon regulatory factor 2 binding protein 2 (IRF2BP2) suppresses the innate inflammatory response of macrophages. A 9-nucleotide deletion (rs3045215) in the 3' untranslated region (3'-UTR) of human IRF2BP2 mRNA confers risk of coronary artery disease (CAD) in the Ottawa Heart Genomics Study (OHGS). Here, we sought to identify regulatory mechanisms that may contribute to this risk. We tested how lipopolysaccharides (LPS) affects IRF2BP2 expression in human THP-1 macrophages and primary aortic smooth muscle cells (HAoSMC) genotyped for the deletion allele. Both cell types are implicated in coronary atherosclerosis. We also examined how the deletion affects interaction with RNA binding proteins (RBPs) to regulate IRF2BP2 expression. LPS altered allele-specific binding of RBPs in RNA gel shift assays with the THP-1 macrophage protein extracts. The RBP ELAVL1 suppressed the expression of a luciferase reporter carrying the 3'UTR of IRF2BP2 with the deletion allele. Other RBPs AUF1 or KHSRP did not confer such allele specific regulation. Since it is co-inherited with a risk variant for osteoporosis, a condition tied to arterial calcification, we examined the association of the deletion allele with coronary artery calcification in individuals who had undergone computed tomography angiography in the OHGS. In 323 individuals with a minimal burden of atherosclerosis (<30% coronary stenosis) and 138 CAD cases (>50% stenosis), Mendelian randomization revealed that the rs3045215 deletion allele significantly increased coronary artery calcification in men with minimal coronary stenosis. Thus, not only does the rs3045215 deletion allele predict atherosclerosis, but it also predisposes to early-onset calcification in men.
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Affiliation(s)
- Ragnar O Vilmundarson
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada.,Laboratory of Translational Genomics, John and Jennifer Ruddy Canadian Cardiovascular Genetics Centre, University of Ottawa Heart Institute, Ottawa, ON, Canada
| | - An Duong
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada.,Laboratory of Translational Genomics, John and Jennifer Ruddy Canadian Cardiovascular Genetics Centre, University of Ottawa Heart Institute, Ottawa, ON, Canada
| | - Fariborz Soheili
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada.,Laboratory of Translational Genomics, John and Jennifer Ruddy Canadian Cardiovascular Genetics Centre, University of Ottawa Heart Institute, Ottawa, ON, Canada
| | - Hsiao-Huei Chen
- Department of Cellular and Molecular Medicine, University of Ottawa, Ottawa, ON, Canada.,The Ottawa Hospital Research Institute, Ottawa, ON, Canada
| | - Alexandre F R Stewart
- Department of Biochemistry, Microbiology and Immunology, University of Ottawa, Ottawa, ON, Canada.,Laboratory of Translational Genomics, John and Jennifer Ruddy Canadian Cardiovascular Genetics Centre, University of Ottawa Heart Institute, Ottawa, ON, Canada
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De Vilder EYG, Martin L, Lefthériotis G, Coucke P, Van Nieuwerburgh F, Vanakker OM. Rare Modifier Variants Alter the Severity of Cardiovascular Disease in Pseudoxanthoma Elasticum: Identification of Novel Candidate Modifier Genes and Disease Pathways Through Mixture of Effects Analysis. Front Cell Dev Biol 2021; 9:612581. [PMID: 34169069 PMCID: PMC8218811 DOI: 10.3389/fcell.2021.612581] [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: 09/30/2020] [Accepted: 05/11/2021] [Indexed: 12/30/2022] Open
Abstract
Introduction: Pseudoxanthoma elasticum (PXE), an ectopic mineralization disorder caused by pathogenic ABCC6 variants, is characterized by skin, ocular and cardiovascular (CV) symptoms. Due to striking phenotypic variability without genotype-phenotype correlations, modifier genes are thought to play a role in disease variability. In this study, we evaluated the collective modifying effect of rare variants on the cardiovascular phenotype of PXE. Materials and Methods: Mixed effects of rare variants were assessed by Whole Exome Sequencing in 11 PXE patients with an extreme CV phenotype (mild/severe). Statistical analysis (SKAT-O and C-alpha testing) was performed to identify new modifier genes for the CV PXE phenotype and enrichment analysis for genes significantly associated with the severe cohort was used to evaluate pathway and gene ontology features. Results Respectively 16 (SKAT-O) and 74 (C-alpha) genes were significantly associated to the severe cohort. Top significant genes could be stratified in 3 groups–calcium homeostasis, association with vascular disease and induction of apoptosis. Comparative analysis of both analyses led to prioritization of four genes (NLRP1, SELE, TRPV1, and CSF1R), all signaling through IL-1B. Conclusion This study explored for the first time the cumulative effect of rare variants on the severity of cardiovascular disease in PXE, leading to a panel of novel candidate modifier genes and disease pathways. Though further validation is essential, this panel may aid in risk stratification and genetic counseling of PXE patients and will help to gain new insights in the PXE pathophysiology.
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Affiliation(s)
- Eva Y G De Vilder
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium.,The Research Foundation - Flanders, Ghent, Belgium.,Department of Ophthalmology, Ghent University Hospital, Ghent, Belgium
| | - Ludovic Martin
- Department of Dermatology, Angers University Hospital, Angers, France
| | - Georges Lefthériotis
- Department of Vascular Physiology and Sports Medicine, Angers University, Angers, France
| | - Paul Coucke
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium.,Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
| | - Filip Van Nieuwerburgh
- Department of Pharmaceutics, Laboratory of Pharmaceutical Biotechnology, Ghent University, Ghent, Belgium
| | - Olivier M Vanakker
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium.,Department of Biomolecular Medicine, Ghent University, Ghent, Belgium
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Quantitative trait locus mapping identifies the Gpnmb gene as a modifier of mouse macrophage lysosome function. Sci Rep 2021; 11:10249. [PMID: 33986446 PMCID: PMC8119501 DOI: 10.1038/s41598-021-89800-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Accepted: 04/30/2021] [Indexed: 01/28/2023] Open
Abstract
We have previously shown that the DBA/2J versus AKR/J mouse strain is associated with decreased autophagy-mediated lysosomal hydrolysis of cholesterol esters. Our objective was to determine differences in lysosome function in AKR/J and DBA/2J macrophages, and identify the responsible genes. Using a novel dual-labeled indicator of lysosome function, DBA/2J versus AKR/J bone marrow derived macrophages had significantly decreased lysosome function. We performed quantitative trait loci mapping of lysosome function in bone marrow macrophages from an AKR/J × DBA/2J strain intercross. Four distinct lysosome function loci were identified, which we named macrophage lysosome function modifier (Mlfm) Mlfm1 through Mlfm4. The strongest locus Mlfm1 harbors the Gpnmb gene, which has been shown to recruit autophagy protein light chain 3 to autophagosomes for lysosome fusion. The parental DBA/2J strain has a nonsense variant in Gpnmb. siRNA knockdown of Gpnmb in AKR/J macrophages decreased lysosome function, and Gpnmb deletion through CRISP/Cas9 editing in RAW 264.7 mouse macrophages also demonstrated a similar result. Furthermore, a DBA/2 substrain, called DBA/2J-Gpnmb+/SjJ, contains the wildtype Gpnmb gene, and macrophages from this Gpnmb-preserved DBA/2 substrain exhibited recovered lysosome function. In conclusion, we identified Gpnmb as a causal modifier gene of lysosome function in this strain pair.
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Kim M, Huda MN, O'Connor A, Albright J, Durbin-Johnson B, Bennett BJ. Hepatic transcriptional profile reveals the role of diet and genetic backgrounds on metabolic traits in female progenitor strains of the Collaborative Cross. Physiol Genomics 2021; 53:173-192. [PMID: 33818129 PMCID: PMC8424536 DOI: 10.1152/physiolgenomics.00140.2020] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 03/23/2021] [Accepted: 03/26/2021] [Indexed: 12/28/2022] Open
Abstract
Mice have provided critical mechanistic understandings of clinical traits underlying metabolic syndrome (MetSyn) and susceptibility to MetSyn in mice is known to vary among inbred strains. We investigated the diet- and strain-dependent effects on metabolic traits in the eight Collaborative Cross (CC) founder strains (A/J, C57BL/6J, 129S1/SvImJ, NOD/ShiLtJ, NZO/HILtJ, CAST/EiJ, PWK/PhJ, and WSB/EiJ). Liver transcriptomics analysis showed that both atherogenic diet and host genetics have profound effects on the liver transcriptome, which may be related to differences in metabolic traits observed between strains. We found strain differences in circulating trimethylamine N-oxide (TMAO) concentration and liver triglyceride content, both of which are traits associated with metabolic diseases. Using a network approach, we identified a module of transcripts associated with TMAO and liver triglyceride content, which was enriched in functional pathways. Interrogation of the module related to metabolic traits identified NADPH oxidase 4 (Nox4), a gene for a key enzyme in the production of reactive oxygen species, which showed a strong association with plasma TMAO and liver triglyceride. Interestingly, Nox4 was identified as the highest expressed in the C57BL/6J and NZO/HILtJ strains and the lowest expressed in the CAST/EiJ strain. Based on these results, we suggest that there may be genetic variation in the contribution of Nox4 to the regulation of plasma TMAO and liver triglyceride content. In summary, we show that liver transcriptomic analysis identified diet- or strain-specific pathways for metabolic traits in the Collaborative Cross (CC) founder strains.
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Affiliation(s)
- Myungsuk Kim
- Department of Nutrition, University of California, Davis, California
- USDA-ARS-Western Human Nutrition Research Center, Davis, California
| | - M Nazmul Huda
- Department of Nutrition, University of California, Davis, California
- USDA-ARS-Western Human Nutrition Research Center, Davis, California
| | - Annalouise O'Connor
- Nutrition Research Institute, University of North Carolina, Kannapolis, North Carolina
| | - Jody Albright
- Nutrition Research Institute, University of North Carolina, Kannapolis, North Carolina
| | | | - Brian J Bennett
- Department of Nutrition, University of California, Davis, California
- USDA-ARS-Western Human Nutrition Research Center, Davis, California
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Shimada BK, Pomozi V, Zoll J, Kuo S, Martin L, Le Saux O. ABCC6, Pyrophosphate and Ectopic Calcification: Therapeutic Solutions. Int J Mol Sci 2021; 22:ijms22094555. [PMID: 33925341 PMCID: PMC8123679 DOI: 10.3390/ijms22094555] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 04/20/2021] [Accepted: 04/21/2021] [Indexed: 12/11/2022] Open
Abstract
Pathological (ectopic) mineralization of soft tissues occurs during aging, in several common conditions such as diabetes, hypercholesterolemia, and renal failure and in certain genetic disorders. Pseudoxanthoma elasticum (PXE), a multi-organ disease affecting dermal, ocular, and cardiovascular tissues, is a model for ectopic mineralization disorders. ABCC6 dysfunction is the primary cause of PXE, but also some cases of generalized arterial calcification of infancy (GACI). ABCC6 deficiency in mice underlies an inducible dystrophic cardiac calcification phenotype (DCC). These calcification diseases are part of a spectrum of mineralization disorders that also includes Calcification of Joints and Arteries (CALJA). Since the identification of ABCC6 as the “PXE gene” and the development of several animal models (mice, rat, and zebrafish), there has been significant progress in our understanding of the molecular genetics, the clinical phenotypes, and pathogenesis of these diseases, which share similarities with more common conditions with abnormal calcification. ABCC6 facilitates the cellular efflux of ATP, which is rapidly converted into inorganic pyrophosphate (PPi) and adenosine by the ectonucleotidases NPP1 and CD73 (NT5E). PPi is a potent endogenous inhibitor of calcification, whereas adenosine indirectly contributes to calcification inhibition by suppressing the synthesis of tissue non-specific alkaline phosphatase (TNAP). At present, therapies only exist to alleviate symptoms for both PXE and GACI; however, extensive studies have resulted in several novel approaches to treating PXE and GACI. This review seeks to summarize the role of ABCC6 in ectopic calcification in PXE and other calcification disorders, and discuss therapeutic strategies targeting various proteins in the pathway (ABCC6, NPP1, and TNAP) and direct inhibition of calcification via supplementation by various compounds.
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Affiliation(s)
- Briana K Shimada
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI 96817, USA
| | - Viola Pomozi
- Institute of Enzymology, RCNS, Hungarian Academy of Sciences, 1117 Budapest, Hungary
| | - Janna Zoll
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI 96817, USA
| | - Sheree Kuo
- Department of Pediatrics, Kapi'olani Medical Center for Women and Children, University of Hawaii, Honolulu, HI 96826, USA
| | - Ludovic Martin
- PXE Consultation Center, MAGEC Reference Center for Rare Skin Diseases, Angers University Hospital, 49100 Angers, France
- BNMI, CNRS 6214/INSERM 1083, University Bretagne-Loire, 49100 Angers, France
| | - Olivier Le Saux
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, HI 96817, USA
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Munz M, Khodaygani M, Aherrahrou Z, Busch H, Wohlers I. In silico candidate variant and gene identification using inbred mouse strains. PeerJ 2021; 9:e11017. [PMID: 33763305 PMCID: PMC7956000 DOI: 10.7717/peerj.11017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2020] [Accepted: 02/06/2021] [Indexed: 12/05/2022] Open
Abstract
Mice are the most widely used animal model to study genotype to phenotype relationships. Inbred mice are genetically identical, which eliminates genetic heterogeneity and makes them particularly useful for genetic studies. Many different strains have been bred over decades and a vast amount of phenotypic data has been generated. In addition, recently whole genome sequencing-based genome-wide genotype data for many widely used inbred strains has been released. Here, we present an approach for in silico fine-mapping that uses genotypic data of 37 inbred mouse strains together with phenotypic data provided by the user to propose candidate variants and genes for the phenotype under study. Public genome-wide genotype data covering more than 74 million variant sites is queried efficiently in real-time to provide those variants that are compatible with the observed phenotype differences between strains. Variants can be filtered by molecular consequences and by corresponding molecular impact. Candidate gene lists can be generated from variant lists on the fly. Fine-mapping together with annotation or filtering of results is provided in a Bioconductor package called MouseFM. In order to characterize candidate variant lists under various settings, MouseFM was applied to two expression data sets across 20 inbred mouse strains, one from neutrophils and one from CD4+ T cells. Fine-mapping was assessed for about 10,000 genes, respectively, and identified candidate variants and haplotypes for many expression quantitative trait loci (eQTLs) reported previously based on these data. For albinism, MouseFM reports only one variant allele of moderate or high molecular impact that only albino mice share: a missense variant in the Tyr gene, reported previously to be causal for this phenotype. Performing in silico fine-mapping for interfrontal bone formation in mice using four strains with and five strains without interfrontal bone results in 12 genes. Of these, three are related to skull shaping abnormality. Finally performing fine-mapping for dystrophic cardiac calcification by comparing 9 strains showing the phenotype with eight strains lacking it, we identify only one moderate impact variant in the known causal gene Abcc6. In summary, this illustrates the benefit of using MouseFM for candidate variant and gene identification.
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Affiliation(s)
- Matthias Munz
- Medical Systems Biology Division, Lübeck Institute of Experimental Dermatology and Institute for Cardiogenetics, University of Lübeck, Lübeck, Germany
| | - Mohammad Khodaygani
- Medical Systems Biology Division, Lübeck Institute of Experimental Dermatology and Institute for Cardiogenetics, University of Lübeck, Lübeck, Germany
| | | | - Hauke Busch
- Medical Systems Biology Division, Lübeck Institute of Experimental Dermatology and Institute for Cardiogenetics, University of Lübeck, Lübeck, Germany
| | - Inken Wohlers
- Medical Systems Biology Division, Lübeck Institute of Experimental Dermatology and Institute for Cardiogenetics, University of Lübeck, Lübeck, Germany
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12
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Sun J, She P, Liu X, Gao B, Jin D, Zhong TP. Disruption of Abcc6 Transporter in Zebrafish Causes Ocular Calcification and Cardiac Fibrosis. Int J Mol Sci 2020; 22:ijms22010278. [PMID: 33383974 PMCID: PMC7795442 DOI: 10.3390/ijms22010278] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/18/2020] [Accepted: 12/25/2020] [Indexed: 12/14/2022] Open
Abstract
Pseudoxanthoma elasticum (PXE), caused by ABCC6/MRP6 mutation, is a heritable multisystem disorder in humans. The progressive clinical manifestations of PXE are accompanied by ectopic mineralization in various connective tissues. However, the pathomechanisms underlying the PXE multisystem disorder remains obscure, and effective treatment is currently available. In this study, we generated zebrafish abcc6a mutants using the transcription activator-like effector nuclease (TALEN) technique. In young adult zebrafish, abcc6a is expressed in the eyes, heart, intestine, and other tissues. abcc6a mutants exhibit extensive calcification in the ocular sclera and Bruch's membrane, recapitulating part of the PXE manifestations. Mutations in abcc6a upregulate extracellular matrix (ECM) genes, leading to fibrotic heart with reduced cardiomyocyte number. We found that abcc6a mutation reduced levels of both vitamin K and pyrophosphate (PPi) in the serum and diverse tissues. Vitamin K administration increased the gamma-glutamyl carboxylated form of matrix gla protein (cMGP), alleviating ectopic calcification and fibrosis in vertebrae, eyes, and hearts. Our findings contribute to a comprehensive understanding of PXE pathophysiology from zebrafish models.
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Affiliation(s)
- Jianjian Sun
- State Key Laboratory of Genetic Engineering, School of Life Sciences, Fudan University, Shanghai 200438, China;
- Shanghai Key Laboratory of Regulatory Biology, Institute of Molecular Medicine, School of Life Sciences, East China Normal University, Shanghai 200241, China; (P.S.); (X.L.); (B.G.); (D.J.)
| | - Peilu She
- Shanghai Key Laboratory of Regulatory Biology, Institute of Molecular Medicine, School of Life Sciences, East China Normal University, Shanghai 200241, China; (P.S.); (X.L.); (B.G.); (D.J.)
| | - Xu Liu
- Shanghai Key Laboratory of Regulatory Biology, Institute of Molecular Medicine, School of Life Sciences, East China Normal University, Shanghai 200241, China; (P.S.); (X.L.); (B.G.); (D.J.)
| | - Bangjun Gao
- Shanghai Key Laboratory of Regulatory Biology, Institute of Molecular Medicine, School of Life Sciences, East China Normal University, Shanghai 200241, China; (P.S.); (X.L.); (B.G.); (D.J.)
| | - Daqin Jin
- Shanghai Key Laboratory of Regulatory Biology, Institute of Molecular Medicine, School of Life Sciences, East China Normal University, Shanghai 200241, China; (P.S.); (X.L.); (B.G.); (D.J.)
| | - Tao P. Zhong
- Shanghai Key Laboratory of Regulatory Biology, Institute of Molecular Medicine, School of Life Sciences, East China Normal University, Shanghai 200241, China; (P.S.); (X.L.); (B.G.); (D.J.)
- Correspondence: ; Tel.: +86-021-54345021
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13
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Oe Y, Mitsui S, Sato E, Shibata N, Kisu K, Sekimoto A, Miyazaki M, Sato H, Ito S, Takahashi N. Lack of Endothelial Nitric Oxide Synthase Accelerates Ectopic Calcification in Uremic Mice Fed an Adenine and High Phosphorus Diet. THE AMERICAN JOURNAL OF PATHOLOGY 2020; 191:283-293. [PMID: 33159888 DOI: 10.1016/j.ajpath.2020.10.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 10/08/2020] [Accepted: 10/28/2020] [Indexed: 12/12/2022]
Abstract
Ectopic calcification is a risk of cardiovascular disease in chronic kidney disease (CKD) patients, and impaired endothelial nitric oxide synthase (eNOS) is involved in the CKD complications. However, whether eNOS dysfunction is a cause of ectopic calcification in CKD remains to be elucidated. To address this issue, we investigated the role of eNOS in ectopic calcification in mice with renal injury caused by an adenine and high-phosphorus (Ade + HP) diet. DBA/2J mice, a calcification-sensitive strain, were fed Ade + HP for 3 weeks. Expression levels of eNOS-related genes were reduced significantly in their calcified aorta. C57BL/6J is a calcification-resistant strain, and wild-type mice showed mild calcified lesions in the aorta and kidney when given an Ade + HP diet for 4 weeks. In contrast, a lack of eNOS led to the development of severe aortic calcification accompanied by an increase in runt-related transcription factor 2, an osteochondrogenic marker. Increased renal calcium deposition and the tubular injury score were remarkable in mice lacking eNOS-fed Ade + HP. Exacerbation of ectopic calcification by a lack of eNOS is associated with increased oxidative stress markers such as nicotinamide adenine dinucleotide phosphate oxidases. In conclusion, eNOS is critically important in preventing ectopic calcification. Therefore, the maintenance of eNOS is useful to reduce cardiovascular disease events and to improve prognosis in CKD patients.
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Affiliation(s)
- Yuji Oe
- Department of Community Medical Support, Tohoku Medical Megabank Organization, Tohoku University, Sendai, Japan; Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan.
| | - Shohei Mitsui
- Division of Clinical Pharmacology and Therapeutics, Tohoku University Graduate School of Pharmaceutical Sciences and Faculty of Pharmaceutical Sciences, Sendai, Japan
| | - Emiko Sato
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Division of Clinical Pharmacology and Therapeutics, Tohoku University Graduate School of Pharmaceutical Sciences and Faculty of Pharmaceutical Sciences, Sendai, Japan
| | - Naoko Shibata
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Kiyomi Kisu
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Akiyo Sekimoto
- Division of Clinical Pharmacology and Therapeutics, Tohoku University Graduate School of Pharmaceutical Sciences and Faculty of Pharmaceutical Sciences, Sendai, Japan
| | - Mariko Miyazaki
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Hiroshi Sato
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Division of Clinical Pharmacology and Therapeutics, Tohoku University Graduate School of Pharmaceutical Sciences and Faculty of Pharmaceutical Sciences, Sendai, Japan
| | - Sadayoshi Ito
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Nobuyuki Takahashi
- Division of Nephrology, Endocrinology, and Vascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan; Division of Clinical Pharmacology and Therapeutics, Tohoku University Graduate School of Pharmaceutical Sciences and Faculty of Pharmaceutical Sciences, Sendai, Japan.
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14
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Levings D, Shaw KE, Lacher SE. Genomic resources for dissecting the role of non-protein coding variation in gene-environment interactions. Toxicology 2020; 441:152505. [PMID: 32450112 DOI: 10.1016/j.tox.2020.152505] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 05/18/2020] [Accepted: 05/18/2020] [Indexed: 12/27/2022]
Abstract
The majority of single nucleotide variants (SNVs) identified in Genome Wide Association Studies (GWAS) fall within non-protein coding DNA and have the potential to alter gene expression. Non-protein coding DNA can control gene expression by acting as transcription factor (TF) binding sites or by regulating the organization of DNA into chromatin. SNVs in non-coding DNA sequences can disrupt TF binding and chromatin structure and this can result in pathology. Further, environmental health studies have shown that exposure to xenobiotics can disrupt the ability of TFs to regulate entire gene networks and result in pathology. However, there is a large amount of interindividual variability in exposure-linked health outcomes. One explanation for this heterogeneity is that genetic variation and exposure combine to disrupt gene regulation, and this eventually manifests in disease. Many resources exist that annotate common variants from GWAS and combine them with conservation, functional genomics, and TF binding data. These annotation tools provide clues regarding the biological implications of an SNV, as well as lead to the generation of hypotheses regarding potentially disrupted target genes, epigenetic markers, pathways, and cell types. Collectively this information can be used to predict how SNVs can alter an individual's response to exposure and disease risk. A basic understanding of the regulatory information contained within non-protein coding DNA is needed to predict the biological consequences of SNVs, and to determine how these SNVs impact exposure-related disease. We hope that this review will aid in the characterization of disease-associated genetic variation in the non-protein coding genome.
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Affiliation(s)
- Daniel Levings
- Department of Biomedical Sciences, University of Minnesota Medical School, Duluth Campus, 1035 University Drive, Duluth, MN, 55812, USA
| | - Kirsten E Shaw
- Department of Biomedical Sciences, University of Minnesota Medical School, Duluth Campus, 1035 University Drive, Duluth, MN, 55812, USA
| | - Sarah E Lacher
- Department of Biomedical Sciences, University of Minnesota Medical School, Duluth Campus, 1035 University Drive, Duluth, MN, 55812, USA.
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15
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Chen Y, Zhao X, Wu H. Arterial Stiffness: A Focus on Vascular Calcification and Its Link to Bone Mineralization. Arterioscler Thromb Vasc Biol 2020; 40:1078-1093. [PMID: 32237904 DOI: 10.1161/atvbaha.120.313131] [Citation(s) in RCA: 98] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
This review focuses on the association between vascular calcification and arterial stiffness, highlighting the important genetic factors, systemic and local microenvironmental signals, and underlying signaling pathways and molecular regulators of vascular calcification. Elevated oxidative stress appears to be a common procalcification factor that induces osteogenic differentiation and calcification of vascular cells in a variety of disease conditions such as atherosclerosis, diabetes mellitus, and chronic kidney disease. Thus, the role of oxidative stress and oxidative stress-regulated signals in vascular smooth muscle cells and their contributions to vascular calcification are highlighted. In relation to diabetes mellitus, the regulation of both hyperglycemia and increased protein glycosylation, by AGEs (advanced glycation end products) and O-linked β-N-acetylglucosamine modification, and its role in enhancing intracellular pathophysiological signaling that promotes osteogenic differentiation and calcification of vascular smooth muscle cells are discussed. In the context of chronic kidney disease, this review details the role of calcium and phosphate homeostasis, parathyroid hormone, and specific calcification inhibitors in regulating vascular calcification. In addition, the impact of the systemic and microenvironmental factors on respective intrinsic signaling pathways that promote osteogenic differentiation and calcification of vascular smooth muscle cells and osteoblasts are compared and contrasted, aiming to dissect the commonalities and distinctions that underlie the paradoxical vascular-bone mineralization disorders in aging and diseases.
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Affiliation(s)
- Yabing Chen
- From the Departments of Pathology (Y.C.), The University of Alabama at Birmingham.,Birmingham Veterans Affairs Medical Center, Research Department, AL (Y.C.)
| | - Xinyang Zhao
- Biochemistry (X.Z.), The University of Alabama at Birmingham
| | - Hui Wu
- Pediatric Dentistry (H.W.), The University of Alabama at Birmingham
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16
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Babler A, Schmitz C, Buescher A, Herrmann M, Gremse F, Gorgels T, Floege J, Jahnen-Dechent W. Microvasculopathy and soft tissue calcification in mice are governed by fetuin-A, magnesium and pyrophosphate. PLoS One 2020; 15:e0228938. [PMID: 32074140 PMCID: PMC7029863 DOI: 10.1371/journal.pone.0228938] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2019] [Accepted: 01/27/2020] [Indexed: 12/18/2022] Open
Abstract
Calcifications can disrupt organ function in the cardiovascular system and the kidney, and are particularly common in patients with chronic kidney disease (CKD). Fetuin-A deficient mice maintained against the genetic background DBA/2 exhibit particularly severe soft tissue calcifications, while fetuin-A deficient C57BL/6 mice remain healthy. We employed molecular genetic analysis to identify risk factors of calcification in fetuin-A deficient mice. We sought to identify pharmaceutical therapeutic targets that could be influenced by dietary of parenteral supplementation. We studied the progeny of an intercross of fetuin-A deficient DBA/2 and C57BL/6 mice to identify candidate risk genes involved in calcification. We determined that a hypomorphic mutation of the Abcc6 gene, a liver ATP transporter supplying systemic pyrophosphate, and failure to regulate the Trpm6 magnesium transporter in kidney were associated with severity of calcification. Calcification prone fetuin-A deficient mice were alternatively treated with parenteral administration of fetuin-A dietary magnesium supplementation, phosphate restriction, or by or parenteral pyrophosphate. All treatments markedly reduced soft tissue calcification, demonstrated by computed tomography, histology and tissue calcium measurement. We show that pathological ectopic calcification in fetuin-A deficient DBA/2 mice is caused by a compound deficiency of three major extracellular and systemic inhibitors of calcification, namely fetuin-A, magnesium, and pyrophosphate. All three of these are individually known to contribute to stabilize protein-mineral complexes and thus inhibit mineral precipitation from extracellular fluid. We show for the first time a compound triple deficiency that can be treated by simple dietary or parenteral supplementation. This is of special importance in patients with advanced CKD, who commonly exhibit reduced serum fetuin-A, magnesium and pyrophosphate levels.
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Affiliation(s)
- Anne Babler
- Helmholtz Institute for Biomedical Engineering, Biointerface Lab, RWTH Aachen University Hospital, Aachen, Germany
| | - Carlo Schmitz
- Helmholtz Institute for Biomedical Engineering, Biointerface Lab, RWTH Aachen University Hospital, Aachen, Germany
| | - Andrea Buescher
- Helmholtz Institute for Biomedical Engineering, Biointerface Lab, RWTH Aachen University Hospital, Aachen, Germany
| | - Marietta Herrmann
- Helmholtz Institute for Biomedical Engineering, Biointerface Lab, RWTH Aachen University Hospital, Aachen, Germany
- IZKF Research Group Tissue Regeneration in Musculoskeletal Regeneration, Orthopedic Center for Musculoskeletal Research, University of Würzburg, Würzburg, Germany
| | - Felix Gremse
- Helmholtz Institute for Biomedical Engineering, Experimental Molecular Imaging, RWTH Aachen University Hospital, Aachen, Germany
| | - Theo Gorgels
- University Eye Clinic Maastricht, Maastricht University Medical Center, Maastricht, The Netherlands
| | - Juergen Floege
- Division of Nephrology and Clinical Immunology, RWTH Aachen University Hospital, Aachen, Germany
| | - Willi Jahnen-Dechent
- Helmholtz Institute for Biomedical Engineering, Biointerface Lab, RWTH Aachen University Hospital, Aachen, Germany
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17
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Evidence of Cardiovascular Calcification and Fibrosis in Pseudoxanthoma Elasticum Mouse Models Subjected to DOCA-Salt Hypertension. Sci Rep 2019; 9:16327. [PMID: 31704980 PMCID: PMC6841718 DOI: 10.1038/s41598-019-52808-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 10/18/2019] [Indexed: 12/13/2022] Open
Abstract
Pseudoxanthoma Elasticum (PXE) is a rare disorder characterized by fragmentation and progressive calcification of elastic fibres in connective tissues. Although arterial hypertension (AHT) has been reported in PXE patients, its impact on pathological manifestations has as yet been unexplored. We investigated the consequences of experimental AHT on Abcc6−/− PXE mouse models. Experimental AHT was induced by deoxycorticosterone acetate (DOCA-salt) in uni-nephrectomised mice. Blood pressure (BP) and vascular reactivity were monitored using tail-cuff plethysmography and myography respectively. Calcium content and fibrosis were assessed using colorimetry, Von Kossa and Sirius red staining respectively. The gene expression implicated in vascular biology was measured using quantitative polymerase chain reaction. DOCA-salt induced a matching rise in BP in Abcc6−/− and WT mice. Aortic ring contraction and relaxation in vitro were comparable. Calcium accumulated in the hearts of hypertensive Abcc6−/− mice along with significant fibrosis in the myocardium and aorta by contrast with the WT mice. In hypertensive Abcc6−/− mouse aortas, these results were corroborated by gene expression patterns favouring calcification, fibrosis and extracellular matrix remodelling. Abcc6 loss-of-function is associated with greater cardiovascular calcification and fibrosis in mice subjected to DOCA-Salt hypertension. These results suggest likely cardiovascular deterioration in PXE patients with AHT, necessitating diligent BP monitoring.
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18
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van Putten M, Putker K, Overzier M, Adamzek WA, Pasteuning-Vuhman S, Plomp JJ, Aartsma-Rus A. Natural disease history of the D2 -mdx mouse model for Duchenne muscular dystrophy. FASEB J 2019; 33:8110-8124. [PMID: 30933664 PMCID: PMC6593893 DOI: 10.1096/fj.201802488r] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The C57BL/10ScSn-Dmdmdx/J (BL10-mdx) mouse has been the most commonly used model for Duchenne muscular dystrophy (DMD) for decades. Their muscle dysfunction and pathology is, however, less severe than in patients with DMD, which complicates preclinical studies. Recent discoveries indicate that disease severity is exacerbated when muscular dystrophy mouse models are generated on a DBA2/J genetic background. Knowledge on the natural history of animal models is pivotal for high-quality preclinical testing. However, for BL10-mdx mice on a DBA2/J background (D2-mdx), limited data are available. We addressed this gap in the natural history knowledge. First, we compared histopathological aspects in skeletal muscles of young D2-mdx, BL10-mdx, and wild-type mice. Pathology was more pronounced in D2-mdx mice and differed in severity between muscles within individuals. Secondly, we subjected D2-mdx mice to a functional test regime for 34 weeks and identified that female D2-mdx mice outperform severely impaired males, making females less useful for functional preclinical studies. Direct comparisons between 10- and 34-wk-old D2-mdx mice revealed that disease pathology ameliorates with age. Heart pathology was progressive, with some features already evident at a young age. This natural history study of the D2-mdx mouse will be instrumental for experimental design of future preclinical studies.-Van Putten, M., Putker, K., Overzier, M., Adamzek, W. A., Pasteuning-Vuhman, S., Plomp, J. J., Aartsma-Rus, A. Natural disease history of the D2-mdx mouse model for Duchenne muscular dystrophy.
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Affiliation(s)
- Maaike van Putten
- Department of Human Genetics, Leiden University Medical Centre, Leiden, The Netherlands
| | - Kayleigh Putker
- Department of Human Genetics, Leiden University Medical Centre, Leiden, The Netherlands
| | - Maurice Overzier
- Department of Human Genetics, Leiden University Medical Centre, Leiden, The Netherlands
| | - W A Adamzek
- Department of Human Genetics, Leiden University Medical Centre, Leiden, The Netherlands
| | | | - Jaap J Plomp
- Department of Neurology, Leiden University Medical Centre, Leiden, The Netherlands
| | - Annemieke Aartsma-Rus
- Department of Human Genetics, Leiden University Medical Centre, Leiden, The Netherlands
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19
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Pomozi V, Julian CB, Zoll J, Pham K, Kuo S, Tőkési N, Martin L, Váradi A, Le Saux O. Dietary Pyrophosphate Modulates Calcification in a Mouse Model of Pseudoxanthoma Elasticum: Implication for Treatment of Patients. J Invest Dermatol 2018; 139:1082-1088. [PMID: 30468740 DOI: 10.1016/j.jid.2018.10.040] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 10/11/2018] [Accepted: 10/25/2018] [Indexed: 12/15/2022]
Abstract
Pseudoxanthoma elasticum is a heritable disease caused by ABCC6 deficiency. Patients develop ectopic calcification in skin, eyes, and vascular tissues. ABCC6, primarily found in liver and kidneys, mediates the cellular efflux of ATP, which is rapidly converted into inorganic pyrophosphate (PPi), a potent inhibitor of calcification. Pseudoxanthoma elasticum patients and Abcc6-/- mice display reduced PPi levels in plasma and peripheral tissues. Pseudoxanthoma elasticum is currently incurable, although some palliative treatments exist. In recent years, we have successfully developed therapeutic methodologies to compensate the PPi deficit in animal models and humans. Here, we inadvertently discovered that modulating dietary PPi can also be an effective approach to reducing calcification in Abcc6-/- mice. Our findings were prompted by a change in institutional rodent diet. The new chow was enriched in PPi, which increased plasma PPi, and significantly reduced mineralization in Abcc6-/- mice. We also found that dietary PPi is readily absorbed in humans. Our results suggest that the consumption of food naturally or artificially enriched in PPi represents a possible intervention to mitigate calcification progression in pseudoxanthoma elasticum, that dietary preferences of patients may explain pseudoxanthoma elasticum heterogeneous manifestations, and that animal chow has the potential to influence data reproducibility.
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Affiliation(s)
- Viola Pomozi
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA; Institute of Enzymology, Research Center for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Charnelle B Julian
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
| | - Janna Zoll
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
| | - Kevin Pham
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
| | - Sheree Kuo
- Department of Pediatrics Kapi'olani Medical Center for Women and Children and University of Hawaii, John A. Burns School of Medicine, Honolulu, Hawaii, USA
| | - Natália Tőkési
- Institute of Enzymology, Research Center for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Ludovic Martin
- Université d'Angers, MitoVasc, Le Centre National de la Recherche Scientifique 6015/Institut National de la Santé et de la Recherche Médicale 1083, Angers, France; Centre Hospitalier Universitaire d'Angers, Centre de Référence PXE, Reference Centre for Genetic Dermatologic Diseases, Nord, Angers, France
| | - András Váradi
- Institute of Enzymology, Research Center for Natural Sciences, Hungarian Academy of Sciences, Budapest, Hungary
| | - Olivier Le Saux
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA.
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20
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Frauscher B, Kirsch AH, Schabhüttl C, Schweighofer K, Kétszeri M, Pollheimer M, Dragun D, Schröder K, Rosenkranz AR, Eller K, Eller P. Autophagy Protects From Uremic Vascular Media Calcification. Front Immunol 2018; 9:1866. [PMID: 30154792 PMCID: PMC6102358 DOI: 10.3389/fimmu.2018.01866] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Accepted: 07/27/2018] [Indexed: 12/11/2022] Open
Abstract
Chronic kidney disease and diabetes mellitus are associated with extensive media calcification, which leads to increased cardiovascular morbidity and mortality. Here, we investigated the role of autophagy in the pathogenesis of uremic vascular media calcification. DBA/2 mice were fed with high-phosphate diet (HPD) in order to cause vascular calcification. DBA/2 mice on standard chow diet were used as control. In parallel, autophagy and its response to rapamycin, 3-methyladenine (3-MA), and bafilomycin were studied in an in vitro model using mouse vascular smooth muscle cells (MOVAS). DBA/2 mice on HPD developed severe vascular media calcification, which is mirrored in vitro by culturing MOVAS under calcifying conditions. Both, in vitro and in vivo, autophagy significantly increased in MOVAS under calcifying conditions and in aortas of HPD mice, respectively. Histologically, autophagy was located to the aortic Tunica media, but also vascular endothelial cells, and was found to continuously increase during HPD treatment. 3-MA as well as bafilomycin blocked autophagy in MOVAS and increased calcification. Vice versa, rapamycin treatment further increased autophagy and resulted in a significant decrease of vascular calcification in vitro and in vivo. Rapamycin reduced Runx2 transcription levels in aortas and MOVAS to control levels, whereas it increased α-smooth muscle actin and Sm22α transcription in MOVAS to control levels. Furthermore, rapamycin-treated HPD mice survived significantly longer compared to HPD controls. These findings indicate that autophagy is an endogenous response of vascular smooth muscle cells (VSMC) to protect from calcification in uremia. Induction of autophagy by rapamycin protects cells and mice from uremic media calcification possibly by inhibiting osteogenic transdifferentiation of VSMC.
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Affiliation(s)
- Bianca Frauscher
- Clinical Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Alexander H Kirsch
- Clinical Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Corinna Schabhüttl
- Clinical Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Kerstin Schweighofer
- Clinical Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Máté Kétszeri
- Clinical Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | | | - Duska Dragun
- Clinic for Nephrology and Critical Care Medicine, Charité - Universitätsmedizin Berlin, Freie Universitat Berlin, Humboldt-Universitat zu Berlin, Berlin, Germany.,Institute of Health (BIH), Berlin, Germany
| | - Katrin Schröder
- Institute for Cardiovascular Physiology, Goethe-University, Frankfurt, Germany
| | - Alexander R Rosenkranz
- Clinical Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Kathrin Eller
- Clinical Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Philipp Eller
- Intensive Care Unit, Department of Internal Medicine, Medical University of Graz, Graz, Austria
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Williams EG, Wu Y, Wolski W, Kim JY, Lan J, Hasan M, Halter C, Jha P, Ryu D, Auwerx J, Aebersold R. Quantifying and Localizing the Mitochondrial Proteome Across Five Tissues in A Mouse Population. Mol Cell Proteomics 2018; 17:1766-1777. [PMID: 29945935 DOI: 10.1074/mcp.ra118.000554] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 04/17/2018] [Indexed: 12/12/2022] Open
Abstract
We have used SWATH mass spectrometry to quantify 3648 proteins across 76 proteomes collected from genetically diverse BXD mouse strains in two fractions (mitochondria and total cell) from five tissues: liver, quadriceps, heart, brain, and brown adipose (BAT). Across tissues, expression covariation between genes' proteins and transcripts-measured in the same individuals-broadly aligned. Covariation was however far stronger in certain subsets than others: only 8% of transcripts in the lowest expression and variance quintile covaried with their protein, in contrast to 65% of transcripts in the highest quintiles. Key functional differences among the 3648 genes were also observed across tissues, with electron transport chain (ETC) genes particularly investigated. ETC complex proteins covary and form strong gene networks according to tissue, but their equivalent transcripts do not. Certain physiological consequences, such as the depletion of ATP synthase in BAT, are thus obscured in transcript data. Lastly, we compared the quantitative proteomic measurements between the total cell and mitochondrial fractions for the five tissues. The resulting enrichment score highlighted several hundred proteins which were strongly enriched in mitochondria, which included several dozen proteins were not reported in literature to be mitochondrially localized. Four of these candidates were selected for biochemical validation, where we found MTAP, SOAT2, and IMPDH2 to be localized inside the mitochondria, whereas ABCC6 was in the mitochondria-associated membrane. These findings demonstrate the synergies of a multi-omics approach to study complex metabolic processes, and this provides a resource for further discovery and analysis of proteoforms, modified proteins, and protein localization.
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Affiliation(s)
- Evan G Williams
- From the ‡Department of Biology, Institute of Molecular Systems Biology, ETH Zurich, Zurich CH-8093, Switzerland.,§Interfaculty Institute of Bioengineering, Laboratory of Integrative and Systems Physiology, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Yibo Wu
- From the ‡Department of Biology, Institute of Molecular Systems Biology, ETH Zurich, Zurich CH-8093, Switzerland.,**Current address: RIKEN Center for Integrative Medical Sciences, 1-7-22 Suehiro-cho Tsurumi-ku Yokohama City, Kanagawa, 230-0045, Japan
| | - Witold Wolski
- ¶Functional Genomics Center Zurich, ETH Zurich, Zurich CH-8057, Switzerland
| | - Jun Yong Kim
- §Interfaculty Institute of Bioengineering, Laboratory of Integrative and Systems Physiology, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Jiayi Lan
- From the ‡Department of Biology, Institute of Molecular Systems Biology, ETH Zurich, Zurich CH-8093, Switzerland
| | - Moaraj Hasan
- From the ‡Department of Biology, Institute of Molecular Systems Biology, ETH Zurich, Zurich CH-8093, Switzerland
| | - Christian Halter
- From the ‡Department of Biology, Institute of Molecular Systems Biology, ETH Zurich, Zurich CH-8093, Switzerland
| | - Pooja Jha
- §Interfaculty Institute of Bioengineering, Laboratory of Integrative and Systems Physiology, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland
| | - Dongryeol Ryu
- §Interfaculty Institute of Bioengineering, Laboratory of Integrative and Systems Physiology, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland.,‡‡Current address: Healthy Aging-Korean Medical Research Center, Pusan National University, School of Korean Medicine, Yangsan 50612, Republic of Korea
| | - Johan Auwerx
- §Interfaculty Institute of Bioengineering, Laboratory of Integrative and Systems Physiology, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne CH-1015, Switzerland;
| | - Ruedi Aebersold
- From the ‡Department of Biology, Institute of Molecular Systems Biology, ETH Zurich, Zurich CH-8093, Switzerland; .,‖Faculty of Science, University of Zurich, Zurich CH-8057, Switzerland
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Etidronate prevents dystrophic cardiac calcification by inhibiting macrophage aggregation. Sci Rep 2018; 8:5812. [PMID: 29643466 PMCID: PMC5895639 DOI: 10.1038/s41598-018-24228-y] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Accepted: 02/26/2018] [Indexed: 12/19/2022] Open
Abstract
Cardiovascular calcification is associated with high risk of vascular disease. This involves macrophage infiltration of injured vascular tissue and osteoclast-related processes. Splenic monocytes from mice, that are predisposed (C3H) or resistant (B6) to calcification, were isolated and differentiated in vitro with M-CSF to generate macrophages, which aggregate to form multinucleated (MN) cells in the presence of RANKL. MN cell formation was significantly decreased in monocytes from resistant compared with calcifying mice. Conditioned media from C3H macrophages strongly induced calcification in vitro. However, medium from B6 macrophages inhibited calcification. An increase in ICAM-1 was detected in conditioned media from C3H macrophages compared with B6, suggesting a key role for this molecule in calcification processes. Due to natural genetic loss of Abcc6, the causal gene for cardiac calcification, C3H mice have reduced plasma levels of inorganic pyrophosphate (PPi), a potential calcification inhibitor. Supplementation of C3H mice with PPi or Etidronate prevented but did not completely reverse cardiac calcification. Our data provide strong evidence of the pathogenesis of macrophages and MNs during tissue calcification and suggest PPi or its analogue Etidronate as a potential inhibitor of MN formation and calcification. Furthermore, the adhesion molecule ICAM-1 was shown to play a key role in calcification.
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Kauffenstein G, Yegutkin GG, Khiati S, Pomozi V, Le Saux O, Leftheriotis G, Lenaers G, Henrion D, Martin L. Alteration of Extracellular Nucleotide Metabolism in Pseudoxanthoma Elasticum. J Invest Dermatol 2018; 138:1862-1870. [PMID: 29501384 DOI: 10.1016/j.jid.2018.02.023] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2017] [Revised: 02/02/2018] [Accepted: 02/15/2018] [Indexed: 01/06/2023]
Abstract
Pseudoxanthoma elasticum (PXE) is a rare genetic condition primarily caused by hepatic ABCC6 transporter dysfunction. Most clinical manifestations of PXE are due to premature calcification of elastic fibers. However, the vascular impact of PXE is pleiotropic and remains ill defined. ABCC6 expression has recently been associated with cellular nucleotide export. We studied the impact of ABCC6 deficiency on blood levels of adenosine triphosphate and related metabolites and on soluble nucleotidase activities in PXE patients and Abcc6-/- mice. In addition, we investigated the expression of genes encoding ectocellular purinergic signaling proteins in mouse liver and aorta. Plasma adenosine triphosphate and pyrophosphate levels were significantly reduced in PXE patients and in Abcc6-/- mice, whereas adenosine concentration was not modified. Moreover, 5'-nucleotidase/CD73 activity was increased in the serum of PXE patients and Abcc6-/- mice. Consistent with alterations of purinergic signaling, the expression of genes involved in purine and phosphate transport/metabolism was dramatically modified in Abcc6-/- mouse aorta, with much less impact on the liver. ABCC6 deficiency causes impaired vascular homeostasis and tissue perfusion. Our findings suggest that these alterations are linked to changes in extracellular nucleotide metabolism that are remote from the liver. This opens new perspectives for the understanding of PXE pathophysiology.
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Affiliation(s)
- Gilles Kauffenstein
- MITOVASC-UMR CNRS 6015 INSERM U1083, Angers University, France; University Hospital of Angers, Angers, France.
| | - Gennady G Yegutkin
- Department of Microbiology and Immunology, MediCity Research Laboratory, University of Turku, Finland
| | - Salim Khiati
- MITOVASC-UMR CNRS 6015 INSERM U1083, Angers University, France
| | - Viola Pomozi
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
| | - Olivier Le Saux
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
| | | | - Guy Lenaers
- MITOVASC-UMR CNRS 6015 INSERM U1083, Angers University, France
| | - Daniel Henrion
- MITOVASC-UMR CNRS 6015 INSERM U1083, Angers University, France
| | - Ludovic Martin
- MITOVASC-UMR CNRS 6015 INSERM U1083, Angers University, France; University Hospital of Angers, Angers, France
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Pérez-Hernández N, Aptilon-Duque G, Blachman-Braun R, Vargas-Alarcón G, Rodríguez-Cortés AA, Azrad-Daniel S, Posadas-Sánchez R, Rodríguez-Pérez JM. Vascular Calcification: Current Genetics Underlying This Complex Phenomenon. Chin Med J (Engl) 2018; 130:1113-1121. [PMID: 28469108 PMCID: PMC5421183 DOI: 10.4103/0366-6999.204931] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
OBJECTIVE Vascular calcification is the consequence of the complex interaction between genetic, environmental, and vascular factors, which ultimately lead to the deposition of calcium in the tunica intima (atherosclerotic calcification) or tunica media (Mönckenberg's sclerosis). Vascular calcification is also closely related to other pathologies, such as diabetes mellitus, dyslipidemia, and chronic kidney disease. It has been concluded that the degree of vascular calcification may vary from person to person, even if the associated pathologies and environmental factors are the same. Therefore, this suggests an important genetic contribution to the development of vascular calcification. This review aimed to find the most recent evidence about vascular calcification pathophysiology regarding the genetic aspects and molecular pathways. DATA SOURCES We conducted an exhaustive search in Scopus, EBSCO, and PubMed with the keywords "genetics and vascular calcification", "molecular pathways, genetic and vascular calcification" and included the main articles from January 1995 up to August 2016. We focused on the most recent evidence about vascular calcification pathophysiology regarding the genetic aspects and molecular pathways. STUDY SELECTION The most valuable published original and review articles related to our objective were selected. RESULTS Vascular calcification is a multifactorial disease; thus, its pathophysiology cannot be explained by a single specific factor, rather than by the result of the association of several genetic variants, molecular pathway interactions, and environmental factors that promote its development. CONCLUSION Although several molecular aspects of this mechanism have been elucidated, there is still a need for a better understanding of the factors that predispose to this disease.
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Affiliation(s)
- Nonanzit Pérez-Hernández
- Department of Molecular Biology, National Institute of Cardiology "Ignacio Chávez", México, Mexico City 14080, México
| | - Gad Aptilon-Duque
- Department of Molecular Biology, National Institute of Cardiology "Ignacio Chávez", México, Mexico City 14080, México
| | - Ruben Blachman-Braun
- Department of Molecular Biology, National Institute of Cardiology "Ignacio Chávez", México, Mexico City 14080, México
| | - Gilberto Vargas-Alarcón
- Department of Molecular Biology, National Institute of Cardiology "Ignacio Chávez", México, Mexico City 14080, México
| | - Adrián Asael Rodríguez-Cortés
- Department of Molecular Biology, National Institute of Cardiology "Ignacio Chávez", México, Mexico City 14080, México
| | - Shely Azrad-Daniel
- Department of Molecular Biology, National Institute of Cardiology "Ignacio Chávez", México, Mexico City 14080, México
| | - Rosalinda Posadas-Sánchez
- Department of Endocrinology, National Institute of Cardiology "Ignacio Chávez", México, México City 14080, México
| | - José Manuel Rodríguez-Pérez
- Department of Molecular Biology, National Institute of Cardiology "Ignacio Chávez", México, Mexico City 14080, México
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Favre G, Laurain A, Aranyi T, Szeri F, Fulop K, Le Saux O, Duranton C, Kauffenstein G, Martin L, Lefthériotis G. The ABCC6 Transporter: A New Player in Biomineralization. Int J Mol Sci 2017; 18:ijms18091941. [PMID: 28891970 PMCID: PMC5618590 DOI: 10.3390/ijms18091941] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 09/02/2017] [Accepted: 09/05/2017] [Indexed: 12/16/2022] Open
Abstract
Pseudoxanthoma elasticum (PXE) is an inherited metabolic disease with autosomal recessive inheritance caused by mutations in the ABCC6 gene. Since the first description of the disease in 1896, alleging a disease involving the elastic fibers, the concept evolved with the further discoveries of the pivotal role of ectopic mineralization that is preponderant in the elastin-rich tissues of the skin, eyes and blood vessel walls. After discovery of the causative gene of the disease in 2000, the function of the ABCC6 protein remains elusive. More than 300 mutations have been now reported and the concept of a dermal disease has progressively evolved toward a metabolic disorder resulting from the remote effects caused by lack of a circulating anti-mineralization factor. Very recently, evidence has accumulated that this anti-mineralizing factor is inorganic pyrophosphate (PPi). This leads to decreased PPi/Pi (inorganic phosphate) ratio that results from the lack of extracellular ATP release by hepatocytes and probably renal cells harboring the mutant ABCC6 protein. However, the mechanism by which ABCC6 dysfunction causes diminished ATP release remains an enigma. Studies of other ABC transporters, such as ABCC7 or ABCC1 could help our understanding of what ABCC6 exact function is. Data and a hypothesis on the possible roles of ABCC6 in acquired metabolic diseases are also discussed.
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Affiliation(s)
- Guillaume Favre
- FINSERM, U 1081, Aging and Diabetes Team, Institute for Research on Cancer and Aging of Nice (IRCAN), 06107 Nice, France.
- CNRS, UMR7284, Institute for Research on Cancer and Aging of Nice (IRCAN), 06107 Nice, France.
- Faculty of Medicine, University of Nice-Sophia Antipolis, 06107 Nice, France.
- Nephrology Department, University Hospital, 06107 Nice, France.
| | - Audrey Laurain
- Nephrology Department, University Hospital, 06107 Nice, France.
| | - Tamas Aranyi
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1117 Budapest, Hungary.
| | - Flora Szeri
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1117 Budapest, Hungary.
| | - Krisztina Fulop
- Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, 1117 Budapest, Hungary.
| | - Olivier Le Saux
- Department Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, HI 96813, USA.
| | - Christophe Duranton
- Laboratory of Physiology and Molecular Medicine (LP2M) UMR CNRS 7073, 06107 Nice, France.
| | - Gilles Kauffenstein
- UMR CNRS 6015-Inserm 1083, School of Medicine, Bretagne Loire University, 49045 Angers, France.
- PXE Health and Research Center, University Hospital of Angers, 49045 Angers, France.
| | - Ludovic Martin
- UMR CNRS 6015-Inserm 1083, School of Medicine, Bretagne Loire University, 49045 Angers, France.
- PXE Health and Research Center, University Hospital of Angers, 49045 Angers, France.
| | - Georges Lefthériotis
- Faculty of Medicine, University of Nice-Sophia Antipolis, 06107 Nice, France.
- Laboratory of Physiology and Molecular Medicine (LP2M) UMR CNRS 7073, 06107 Nice, France.
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Miglionico R, Ostuni A, Armentano MF, Milella L, Crescenzi E, Carmosino M, Bisaccia F. ABCC6 knockdown in HepG2 cells induces a senescent-like cell phenotype. Cell Mol Biol Lett 2017; 22:7. [PMID: 28536638 PMCID: PMC5415800 DOI: 10.1186/s11658-017-0036-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Accepted: 03/02/2017] [Indexed: 11/17/2022] Open
Abstract
Background Pseudoxanthoma elasticum (PXE) is characterized by progressive ectopic mineralization of elastic fibers in dermal, ocular and vascular tissues. No effective treatment exists. It is caused by inactivating mutations in the gene encoding for the ATP-binding cassette, sub-family C member 6 transporter (ABCC6), which is mainly expressed in the liver. The ABCC6 substrate (s) and the PXE pathomechanism remain unknown. Recent studies have shown that overexpression of ABCC6 in HEK293 cells results in efflux of ATP, which is rapidly converted into nucleoside monophosphates and pyrophosphate (PPi). Since the latter inhibits mineralization, it was proposed that the absence of circulating PPi in PXE patients results in the characteristic ectopic mineralization. These studies also demonstrated that the presence of ABCC6 modifies cell secretory activity and suggested that ABCC6 can change the cell phenotype. Methods Stable ABCC6 knockdown HepG2 clones were generated using small hairpin RNA (shRNA) technology. The intracellular glutathione and ROS levels were determined. Experiments using cell cycle analysis, real-time PCR and western blot were performed on genes involved in the senescence phenotype. Results To shed light on the physiological role of ABCC6, we focused on the phenotype of HepG2 cells that lack ABCC6 activity. Interestingly, we found that ABCC6 knockdown HepG2 cells show: 1) intracellular reductive stress; 2) cell cycle arrest in G1 phase; 3) upregulation of p21Cip p53 independent; and 4) downregulation of lamin A/C. Conclusions These findings show that the absence of ABCC6 profoundly changes the HepG2 phenotype, suggesting that the PXE syndrome is a complex metabolic disease that is not exclusively related to the absence of pyrophosphate in the bloodstream.
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Affiliation(s)
- Rocchina Miglionico
- Department of Sciences, University of Basilicata, Via dell'Ateneo Lucano, 85100 Potenza, Italy
| | - Angela Ostuni
- Department of Sciences, University of Basilicata, Via dell'Ateneo Lucano, 85100 Potenza, Italy
| | | | - Luigi Milella
- Department of Sciences, University of Basilicata, Via dell'Ateneo Lucano, 85100 Potenza, Italy
| | - Elvira Crescenzi
- Institute of Experimental Endocrinology and Oncology (IEOS), National Research Council (CNR), 80131 Naples, Italy
| | - Monica Carmosino
- Department of Sciences, University of Basilicata, Via dell'Ateneo Lucano, 85100 Potenza, Italy
| | - Faustino Bisaccia
- Department of Sciences, University of Basilicata, Via dell'Ateneo Lucano, 85100 Potenza, Italy
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Frauscher B, Artinger K, Kirsch AH, Aringer I, Moschovaki-Filippidou F, Kétszeri M, Schabhüttl C, Rainer PP, Schmidt A, Stojakovic T, Fahrleitner-Pammer A, Rosenkranz AR, Eller P, Eller K. A New Murine Model of Chronic Kidney Disease-Mineral and Bone Disorder. Int J Endocrinol 2017; 2017:1659071. [PMID: 29387084 PMCID: PMC5745741 DOI: 10.1155/2017/1659071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 08/31/2017] [Accepted: 09/11/2017] [Indexed: 01/18/2023] Open
Abstract
Chronic kidney disease (CKD) is associated with mineral and bone disorder (MBD), which is the main cause of the extensively increased cardiovascular mortality in the CKD population. We now aimed to establish a new murine experimental CKD-MBD model. Dilute brown non-Agouti (DBA/2) mice were fed with high-phosphate diet for 4 (HPD4) or 7 (HPD7) days, then with standard chow diet (SCD) and subsequently followed until day 84. They were compared to DBA/2 mice maintained on SCD during the whole study period. Both 4 and 7 days HPD-fed mice developed phosphate nephropathy with tubular atrophy, interstitial fibrosis, decreased glomerular filtration rate, and increased serum urea levels. The abdominal aorta of HPD-treated mice showed signs of media calcification. Histomorphometric analysis of HPD-treated mice showed decreased bone volume/tissue volume, low mineral apposition rate, and low bone formation rate as compared to SCD-fed mice, despite increased parathyroid hormone levels. Overall, the observed phenotype was more pronounced in the HPD7 group. In summary, we established a new, noninvasive, and therefore easy to perform reproducible CKD-MBD model, which showed media calcification, secondary hyperparathyroidism, and low-turnover bone disease.
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Affiliation(s)
- Bianca Frauscher
- Clinical Division of Nephrology, Medical University of Graz, Graz, Austria
| | - Katharina Artinger
- Clinical Division of Nephrology, Medical University of Graz, Graz, Austria
| | | | - Ida Aringer
- Clinical Division of Nephrology, Medical University of Graz, Graz, Austria
| | | | - Máté Kétszeri
- Clinical Division of Nephrology, Medical University of Graz, Graz, Austria
| | - Corinna Schabhüttl
- Clinical Division of Nephrology, Medical University of Graz, Graz, Austria
| | - Peter P. Rainer
- Clinical Division of Cardiology, Medical University of Graz, Graz, Austria
| | - Albrecht Schmidt
- Clinical Division of Cardiology, Medical University of Graz, Graz, Austria
| | - Tatjana Stojakovic
- Clinical Institute of Medical and Chemical Laboratory Diagnostics, Medical University of Graz, Graz, Austria
| | | | | | - Philipp Eller
- Intensive Care Unit, Department of Internal Medicine, Medical University of Graz, Graz, Austria
| | - Kathrin Eller
- Clinical Division of Nephrology, Medical University of Graz, Graz, Austria
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28
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Pomozi V, Brampton C, Szeri F, Dedinszki D, Kozák E, van de Wetering K, Hopkins H, Martin L, Váradi A, Le Saux O. Functional Rescue of ABCC6 Deficiency by 4-Phenylbutyrate Therapy Reduces Dystrophic Calcification in Abcc6 -/- Mice. J Invest Dermatol 2016; 137:595-602. [PMID: 27826008 DOI: 10.1016/j.jid.2016.10.035] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 10/04/2016] [Accepted: 10/13/2016] [Indexed: 12/16/2022]
Abstract
Soft-tissue calcification is associated with aging, common conditions such as diabetes or hypercholesterolemia, and with certain genetic disorders. ABCC6 is an efflux transporter primarily expressed in liver facilitating the release of adenosine triphosphate from hepatocytes. Within the liver vasculature, adenosine triphosphate is converted into pyrophosphate, a major inhibitor of ectopic calcification. ABCC6 mutations thus lead to reduced plasma pyrophosphate levels, resulting in the calcification disorder pseudoxanthoma elasticum and some cases of generalized arterial calcification of infancy. Most mutations in ABCC6 are missense, and many preserve transport activity but are retained intracellularly. We have previously shown that the chemical chaperone 4-phenylbutyrate (4-PBA) promotes the maturation of ABCC6 mutants to the plasma membrane. In a humanized mouse model of pseudoxanthoma elasticum, we investigated whether 4-PBA treatments could rescue the calcification inhibition potential of selected ABCC6 mutants. We used the dystrophic cardiac calcification phenotype of Abcc6-/- mice as an indicator of ABCC6 function to quantify the effect of 4-PBA on human ABCC6 mutants transiently expressed in the liver. We showed that 4-PBA administrations restored the physiological function of ABCC6 mutants, resulting in enhanced calcification inhibition. This study identifies 4-PBA treatment as a promising strategy for allele-specific therapy of ABCC6-associated calcification disorders.
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Affiliation(s)
- Viola Pomozi
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA; Institute of Enzymology, RCNS, Hungarian Academy of Sciences, Budapest, Hungary
| | - Christopher Brampton
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
| | - Flóra Szeri
- Institute of Enzymology, RCNS, Hungarian Academy of Sciences, Budapest, Hungary
| | - Dóra Dedinszki
- Institute of Enzymology, RCNS, Hungarian Academy of Sciences, Budapest, Hungary
| | - Eszter Kozák
- Institute of Enzymology, RCNS, Hungarian Academy of Sciences, Budapest, Hungary
| | - Koen van de Wetering
- Division of Molecular Oncology, Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Hi'ilani Hopkins
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
| | - Ludovic Martin
- University of Angers, Angers, France; CHU Angers, Centre de consultation PXE, Angers, France
| | - András Váradi
- Institute of Enzymology, RCNS, Hungarian Academy of Sciences, Budapest, Hungary
| | - Olivier Le Saux
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA.
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29
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Lusis AJ, Seldin MM, Allayee H, Bennett BJ, Civelek M, Davis RC, Eskin E, Farber CR, Hui S, Mehrabian M, Norheim F, Pan C, Parks B, Rau CD, Smith DJ, Vallim T, Wang Y, Wang J. The Hybrid Mouse Diversity Panel: a resource for systems genetics analyses of metabolic and cardiovascular traits. J Lipid Res 2016; 57:925-42. [PMID: 27099397 PMCID: PMC4878195 DOI: 10.1194/jlr.r066944] [Citation(s) in RCA: 113] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 04/12/2016] [Indexed: 02/07/2023] Open
Abstract
The Hybrid Mouse Diversity Panel (HMDP) is a collection of approximately 100 well-characterized inbred strains of mice that can be used to analyze the genetic and environmental factors underlying complex traits. While not nearly as powerful for mapping genetic loci contributing to the traits as human genome-wide association studies, it has some important advantages. First, environmental factors can be controlled. Second, relevant tissues are accessible for global molecular phenotyping. Finally, because inbred strains are renewable, results from separate studies can be integrated. Thus far, the HMDP has been studied for traits relevant to obesity, diabetes, atherosclerosis, osteoporosis, heart failure, immune regulation, fatty liver disease, and host-gut microbiota interactions. High-throughput technologies have been used to examine the genomes, epigenomes, transcriptomes, proteomes, metabolomes, and microbiomes of the mice under various environmental conditions. All of the published data are available and can be readily used to formulate hypotheses about genes, pathways and interactions.
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Affiliation(s)
- Aldons J Lusis
- Departments of Medicine, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA Microbiology, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA Human Genetics, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA
| | - Marcus M Seldin
- Departments of Medicine, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA
| | - Hooman Allayee
- Department of Preventive Medicine, University of Southern California Keck School of Medicine, Los Angeles, CA
| | - Brian J Bennett
- Department of Genetics, University of North Carolina, Chapel Hill, NC
| | - Mete Civelek
- Departments of Biomedical Engineering University of Virginia, Charlottesville, VA
| | - Richard C Davis
- Departments of Medicine, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA
| | - Eleazar Eskin
- Departments of Computer Science, University of California-Los Angeles, Los Angeles, CA
| | - Charles R Farber
- Public Health Sciences, University of Virginia, Charlottesville, VA
| | - Simon Hui
- Departments of Medicine, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA
| | - Margarete Mehrabian
- Departments of Medicine, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA
| | - Frode Norheim
- Departments of Medicine, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA
| | - Calvin Pan
- Human Genetics, University of California-Los Angeles, Los Angeles, CA
| | - Brian Parks
- Department of Nutritional Sciences, University of Wisconsin-Madison, Madison, WI
| | - Christoph D Rau
- Anesthesiology, University of California-Los Angeles, Los Angeles, CA
| | - Desmond J Smith
- Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA
| | - Thomas Vallim
- Departments of Medicine, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA
| | - Yibin Wang
- Anesthesiology, University of California-Los Angeles, Los Angeles, CA
| | - Jessica Wang
- Departments of Medicine, David Geffen School of Medicine, University of California-Los Angeles, Los Angeles, CA
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Mouse genome-wide association study identifies polymorphisms on chromosomes 4, 11, and 15 for age-related cardiac fibrosis. Mamm Genome 2016; 27:179-90. [PMID: 27126641 DOI: 10.1007/s00335-016-9634-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 03/24/2016] [Indexed: 10/21/2022]
Abstract
Dystrophic cardiac calcinosis (DCC), also called epicardial and myocardial fibrosis and mineralization, has been detected in mice of a number of laboratory inbred strains, most commonly C3H/HeJ and DBA/2J. In previous mouse breeding studies between these DCC susceptible and the DCC-resistant strain C57BL/6J, 4 genetic loci harboring genes involved in DCC inheritance were identified and subsequently termed Dyscalc loci 1 through 4. Here, we report susceptibility to cardiac fibrosis, a sub-phenotype of DCC, at 12 and 20 months of age and close to natural death in a survey of 28 inbred mouse strains. Eight strains showed cardiac fibrosis with highest frequency and severity in the moribund mice. Using genotype and phenotype information of the 28 investigated strains, we performed genome-wide association studies (GWAS) and identified the most significant associations on chromosome (Chr) 15 at 72 million base pairs (Mb) (P < 10(-13)) and Chr 4 at 122 Mb (P < 10(-11)) and 134 Mb (P < 10(-7)). At the Chr 15 locus, Col22a1 and Kcnk9 were identified. Both have been reported to be morphologically and functionally important in the heart muscle. The strongest Chr 4 associations were located approximately 6 Mb away from the Dyscalc 2 quantitative trait locus peak within the boundaries of the Extl1 gene and in close proximity to the Trim63 and Cap1 genes. In addition, a single-nucleotide polymorphism association was found on chromosome 11. This study provides evidence for more than the previously reported 4 genetic loci determining cardiac fibrosis and DCC. The study also highlights the power of GWAS in the mouse for dissecting complex genetic traits.
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Marton J, Albert D, Wiltshire SA, Park R, Bergen A, Qureshi S, Malo D, Burelle Y, Vidal SM. Cyclosporine A Treatment Inhibits Abcc6-Dependent Cardiac Necrosis and Calcification following Coxsackievirus B3 Infection in Mice. PLoS One 2015; 10:e0138222. [PMID: 26375467 PMCID: PMC4574283 DOI: 10.1371/journal.pone.0138222] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Accepted: 08/26/2015] [Indexed: 11/18/2022] Open
Abstract
Coxsackievirus type B3 (CVB3) is a cardiotropic enterovirus. Infection causes cardiomyocyte necrosis and myocardial inflammation. The damaged tissue that results is replaced with fibrotic or calcified tissue, which can lead to permanently altered cardiac function. The extent of pathogenesis among individuals exposed to CVB3 is dictated by a combination of host genetics, viral virulence, and the environment. Here, we aimed to identify genes that modulate cardiopathology following CVB3 infection. 129S1 mice infected with CVB3 developed increased cardiac pathology compared to 129X1 substrain mice despite no difference in viral burden. Linkage analysis identified a major locus on chromosome 7 (LOD: 8.307, P<0.0001) that controlled the severity of cardiac calcification and necrosis following infection. Sub-phenotyping and genetic complementation assays identified Abcc6 as the underlying gene. Microarray expression profiling identified genotype-dependent regulation of genes associated with mitochondria. Electron microscopy examination showed elevated deposition of hydroxyapatite-like material in the mitochondrial matrices of infected Abcc6 knockout (Abcc6-/-) mice but not in wildtype littermates. Cyclosporine A (CsA) inhibits mitochondrial permeability transition pore opening by inhibiting cyclophilin D (CypD). Treatment of Abcc6 -/- mice with CsA reduced cardiac necrosis and calcification by more than half. Furthermore, CsA had no effect on the CVB3-induced phenotype of doubly deficient CypD-/-Abcc6-/- mice. Altogether, our work demonstrates that mutations in Abcc6 render mice more susceptible to cardiac calcification following CVB3 infection. Moreover, we implicate CypD in the control of cardiac necrosis and calcification in Abcc6-deficient mice, whereby CypD inhibition is required for cardioprotection.
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Affiliation(s)
- Jennifer Marton
- Department of Human Genetics and Complex Traits Group, McGill University, Montreal, Canada
| | - Danica Albert
- Department of Human Genetics and Complex Traits Group, McGill University, Montreal, Canada
| | - Sean A. Wiltshire
- Department of Human Genetics and Complex Traits Group, McGill University, Montreal, Canada
| | - Robin Park
- Department of Human Genetics and Complex Traits Group, McGill University, Montreal, Canada
| | - Arthur Bergen
- Department of Ophthalmogenetics, The Netherlands Institute for Neuroscience, Amsterdam, The Netherlands
| | - Salman Qureshi
- The Center for Host Resistance and the Division of Experimental Medicine, McGill University, Montreal, Canada
| | - Danielle Malo
- Department of Human Genetics and Complex Traits Group, McGill University, Montreal, Canada
| | - Yan Burelle
- Faculty of Pharmacy, University of Montreal, Montreal, Canada
| | - Silvia M. Vidal
- Department of Human Genetics and Complex Traits Group, McGill University, Montreal, Canada
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De Vilder EYG, Hosen MJ, Vanakker OM. The ABCC6 Transporter as a Paradigm for Networking from an Orphan Disease to Complex Disorders. BIOMED RESEARCH INTERNATIONAL 2015; 2015:648569. [PMID: 26356190 PMCID: PMC4555454 DOI: 10.1155/2015/648569] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/19/2015] [Revised: 06/15/2015] [Accepted: 06/23/2015] [Indexed: 01/16/2023]
Abstract
The knowledge on the genetic etiology of complex disorders largely results from the study of rare monogenic disorders. Often these common and rare diseases show phenotypic overlap, though monogenic diseases generally have a more extreme symptomatology. ABCC6, the gene responsible for pseudoxanthoma elasticum, an autosomal recessive ectopic mineralization disorder, can be considered a paradigm gene with relevance that reaches far beyond this enigmatic orphan disease. Indeed, common traits such as chronic kidney disease or cardiovascular disorders have been linked to the ABCC6 gene. While during the last decade the awareness of the wide ramifications of ABCC6 has increased significantly, the gene itself and the transmembrane transporter it encodes have not unveiled all of the mysteries that surround them. To gain more insights, multiple approaches are being used including next-generation sequencing, computational methods, and various "omics" technologies. Much effort is made to place the vast amount of data that is gathered in an integrated system-biological network; the involvement of ABCC6 in common disorders provides a good view on the wide implications and potential of such a network. In this review, we summarize the network approaches used to study ABCC6 and the role of this gene in several complex diseases.
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Affiliation(s)
- Eva Y. G. De Vilder
- Center for Medical Genetics, Ghent University Hospital, 9000 Ghent, Belgium
- Department of Ophthalmology, Ghent University Hospital, 9000 Ghent, Belgium
| | - Mohammad Jakir Hosen
- Center for Medical Genetics, Ghent University Hospital, 9000 Ghent, Belgium
- Department of Genetic Engineering and Biotechnology, Shahjalal University of Science and Technology, Sylhet 3114, Bangladesh
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Kirsch AH, Kirsch A, Artinger K, Schabhüttl C, Goessler W, Klymiuk I, Gülly C, Fritz GA, Frank S, Wimmer R, Brodmann M, Anders HJ, Pramstaller PP, Rosenkranz AR, Eller K, Eller P. Heterogeneous susceptibility for uraemic media calcification and concomitant inflammation within the arterial tree. Nephrol Dial Transplant 2015; 30:1995-2005. [PMID: 26185049 PMCID: PMC4656037 DOI: 10.1093/ndt/gfv265] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2015] [Accepted: 06/01/2015] [Indexed: 12/27/2022] Open
Abstract
Background End-stage renal disease (ESRD) is strongly associated with arterial calcification of the tunica media, decreased vascular compliance and sudden cardiac death. Here, we analysed the distribution pattern of uraemic media calcification and concomitant inflammation in mice and men. Methods Uraemia was induced in DBA/2 mice with high-phosphate diet. Subsequently, we analysed arterial medial calcification using histology, mass spectrometry, and wire myography. Gene expression was quantified using a whole transcriptome array and quantitative PCR. In a cohort of 36 consecutive patients with CKD stage 4–5, we measured the calcium score of the coronary arteries, the ascending thoracic aorta and the infrarenal abdominal aorta using computed tomography scans. Results Uraemic DBA/2 mice showed only minor calcifications in thoracic aortas, whereas there was overt media calcification in abdominal aortas. The transcriptional profile and immunohistochemistry revealed induction of Vcam1 expression by vascular smooth muscle cells in uraemic abdominal aortas. Macrophages infiltrated the tunica media of the abdominal aorta. Anti-inflammatory treatment did not improve uraemic media calcification in our animal model. Arterial calcifications in ESRD patients showed a similar distribution pattern in computed tomography scans, with higher calcium scores of the abdominal aorta when compared with the thoracic aorta. Conclusion Taken together, there was a similar heterogeneous pattern of calcification in both mice and humans, where the abdominal aorta was more prone to media calcification when compared with the thoracic aorta. In uraemia, smooth muscle cells of the abdominal aorta showed a phenotypic switch to an inflammatory and osteoblastic phenotype.
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Affiliation(s)
- Alexander H Kirsch
- Department of Internal Medicine, Clinical Division of Nephrology, Medical University of Graz, Graz, Austria
| | - Andrijana Kirsch
- Center of Molecular Medicine, Institute of Molecular Biology and Biochemistry, Medical University of Graz, Graz, Austria
| | - Katharina Artinger
- Department of Internal Medicine, Clinical Division of Nephrology, Medical University of Graz, Graz, Austria
| | - Corinna Schabhüttl
- Department of Internal Medicine, Division of Angiology, Medical University of Graz, Graz, Austria
| | - Walter Goessler
- Institute of Chemistry-Analytical Chemistry, Karl-Franzens University of Graz, Graz, Austria
| | - Ingeborg Klymiuk
- Center for Medical Research, Core Facility Molecular Biology, Medical University of Graz, Graz, Austria
| | - Christian Gülly
- Center for Medical Research, Core Facility Molecular Biology, Medical University of Graz, Graz, Austria
| | - Gerald A Fritz
- Department of Radiology, Medical University of Graz, Graz, Austria
| | - Saša Frank
- Center of Molecular Medicine, Institute of Molecular Biology and Biochemistry, Medical University of Graz, Graz, Austria
| | - Roxana Wimmer
- Department of Internal Medicine, Clinical Division of Nephrology, Medical University of Graz, Graz, Austria
| | - Marianne Brodmann
- Department of Internal Medicine, Division of Angiology, Medical University of Graz, Graz, Austria
| | - Hans-Joachim Anders
- Renal Division, Medizinische Klinik und Poliklinik IV, Klinikum der Universität München-Innenstadt, Munich, Germany
| | | | - Alexander R Rosenkranz
- Department of Internal Medicine, Clinical Division of Nephrology, Medical University of Graz, Graz, Austria
| | - Kathrin Eller
- Department of Internal Medicine, Clinical Division of Nephrology, Medical University of Graz, Graz, Austria
| | - Philipp Eller
- Department of Internal Medicine, Division of Angiology, Medical University of Graz, Graz, Austria Department of Internal Medicine, Intensive Care Unit, Medical University of Graz, Graz, Austria
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The role of fetuin-A in mineral trafficking and deposition. BONEKEY REPORTS 2015; 4:672. [PMID: 25987986 DOI: 10.1038/bonekey.2015.39] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Accepted: 02/13/2015] [Indexed: 12/18/2022]
Abstract
Calcium and phosphate are the principle ions involved in the deposition of mineral in the human body. Inhibitors of mineralisation are essential for the prevention of ectopic mineral precipitation and deposition. In the past decade, through in vitro, in vivo and clinical observation studies, we have come to appreciate the importance of fetuin-A (Fet-A), a circulating glycoprotein, in preventing ectopic calcium phosphate mineralisation. Moreover, the detection of Fet-A-containing mineral complex, termed calciprotein particles (CPPs), has provided new ways to assess an individual's calcific risk. The pathophysiological significance of CPPs in disease states is yet to be defined, but it provides an exciting avenue to further our understanding of the development of ectopic mineralisation.
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Biochemical and Functional Comparisons of mdx and Sgcg(-/-) Muscular Dystrophy Mouse Models. BIOMED RESEARCH INTERNATIONAL 2015; 2015:131436. [PMID: 26064876 PMCID: PMC4433636 DOI: 10.1155/2015/131436] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Revised: 01/13/2015] [Accepted: 01/13/2015] [Indexed: 12/31/2022]
Abstract
Mouse models have provided an essential platform to investigate facets of human diseases, from etiology, diagnosis, and prognosis, to potential treatments. Muscular dystrophy (MD) is the most common human genetic disease occurring in approximately 1 in 2500 births. The mdx mouse, which is dystrophin-deficient, has long been used to model this disease. However, this mouse strain displays a rather mild disease course compared to human patients. The mdx mice have been bred to additional genetically engineered mice to worsen the disease. Alternatively, other genes which cause human MD have been genetically disrupted in mice. We are now comparing disease progression from one of these alternative gene disruptions, the γ-sarcoglycan null mouse Sgcg−/− on the DBA2/J background, to the mdx mouse line. This paper aims to assess the time-course severity of the disease in the mouse models and determine which is best for MD research. The Sgcg−/− mice have a more severe phenotype than the mdx mice. Muscle function was assessed by plethysmography and echocardiography. Histologically the Sgcg−/− mice displayed increased fibrosis and variable fiber size. By quantitative Evan's blue dye uptake and hydroxyproline content two key disease determinants, membrane permeability and fibrosis respectively, were also proven worse in the Sgcg−/− mice.
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Blazquez-Medela AM, Guihard PJ, Yao J, Jumabay M, Lusis AJ, Boström KI, Yao Y. ABCC6 deficiency is associated with activation of BMP signaling in liver and kidney. FEBS Open Bio 2015; 5:257-63. [PMID: 25893161 PMCID: PMC4398664 DOI: 10.1016/j.fob.2015.03.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2015] [Revised: 03/05/2015] [Accepted: 03/18/2015] [Indexed: 12/02/2022] Open
Abstract
ABCC6 deficiency stimulates BMP signaling in multiple organs. ABCC6 deficiency causes tissue-specific induction of BMP-related genes. Tissue-specific targeting of BMP signaling may be needed in ABCC deficiency.
Mutations in ABCC6 (ATP-binding cassette, subfamily C, member 6), an orphan transporter expressed in the liver, are the cause of pseudoxanthoma elasticum. Since ABCC6 was reported to affect matrix Gla protein (MGP), an inhibitor of bone morphogenetic proteins (BMPs), we studied BMP signaling and expression in various tissues of mice with and without functional ABCC. Enhanced BMP signaling was found in all examined tissues in the absence of ABCC6. Despite this, the expression of particular BMP proteins varied widely between tissues. Interestingly, the expression of most BMP proteins in the liver moved in the opposite direction to the same BMP proteins in kidneys in response to ABCC6 alterations. Thus, ABCC6 deficiency stimulates BMP signaling by acting on the expression of multiple BMPs.
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Affiliation(s)
- Ana M Blazquez-Medela
- Division of Cardiology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1679, United States
| | - Pierre J Guihard
- Division of Cardiology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1679, United States
| | - Jiayi Yao
- Division of Cardiology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1679, United States
| | - Medet Jumabay
- Division of Cardiology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1679, United States
| | - Aldons J Lusis
- Division of Cardiology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1679, United States ; Molecular Biology Institute, UCLA, United States
| | - Kristina I Boström
- Division of Cardiology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1679, United States ; Molecular Biology Institute, UCLA, United States
| | - Yucheng Yao
- Division of Cardiology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095-1679, United States
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Scott-Boyer MP, Praktiknjo SD, Llamas B, Picard S, Deschepper CF. Dual Linkage of a Locus to Left Ventricular Mass and a Cardiac Gene Co-Expression Network Driven by a Chromosome Domain. Front Cardiovasc Med 2014; 1:11. [PMID: 26664861 PMCID: PMC4668859 DOI: 10.3389/fcvm.2014.00011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 11/27/2014] [Indexed: 12/22/2022] Open
Abstract
We have previously reported Lvm1 as a quantitative trait locus (QTL) on chromosome 13 that links to cardiac left ventricular mass (LVM) in a panel of AxB/BxA mouse recombinant inbred strains (RIS). When performing a gene expression QTL (eQTL) analysis, we detected 33 cis-eQTLs that correlated with LVM. Among the latter, a group of eight cis-eQTLs clustered in a genomic region smaller than 6 Mb and surrounding the Lvm1 peak on chr13. Co-variant analysis indicated that all eight genes correlated with the phenotype in a causal rather than a reactive fashion, a finding that (despite its functional interest) did not provide grounds to prioritize any of these candidate genes. As a complementary approach, we performed weighted gene co-expression network analysis, which allowed us to detect 49 modules of highly connected genes. The module that correlated best with LVM: (1) showed linkage to a module QTL whose boundaries matched closely those of the phenotypic Lvm1 QTL on chr13; (2) harbored a disproportionately high proportion of genes originating from a small genomic region on chromosome 13 (including the 8 previously detected cis-eQTL genes); (3) contained genes that, beyond their individual level of expression, correlated with LVM as a function of their inter-connectivity; and (4) showed increased abundance of polymorphic insertion–deletion elements in the same region. Taken together, these data suggest that a domain on chromosome 13 constitutes the biologic principle responsible for the organization and linkage of the gene co-expression module, and indicate a mechanism whereby genetic variants within chromosome domains may associate to phenotypic changes via coordinate changes in the expression of several genes. One other possible implication of these findings is that candidate genes to consider as contributors to a particular phenotype should extend further than those that are closest to the QTL peak.
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Affiliation(s)
- Marie-Pier Scott-Boyer
- Cardiovascular Biology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Université de Montréal , Montréal, QC , Canada
| | - Samantha D Praktiknjo
- Cardiovascular Biology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Université de Montréal , Montréal, QC , Canada
| | - Bastien Llamas
- Cardiovascular Biology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Université de Montréal , Montréal, QC , Canada
| | - Sylvie Picard
- Cardiovascular Biology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Université de Montréal , Montréal, QC , Canada
| | - Christian F Deschepper
- Cardiovascular Biology Research Unit, Institut de recherches cliniques de Montréal (IRCM), Université de Montréal , Montréal, QC , Canada
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Rau CD, Wang J, Avetisyan R, Romay MC, Martin L, Ren S, Wang Y, Lusis AJ. Mapping genetic contributions to cardiac pathology induced by Beta-adrenergic stimulation in mice. ACTA ACUST UNITED AC 2014; 8:40-9. [PMID: 25480693 DOI: 10.1161/circgenetics.113.000732] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Chronic stress-induced cardiac pathology exhibits both a wide range in severity and a high degree of heterogeneity in clinical manifestation in human patients. This variability is contributed to by complex genetic and environmental etiologies within the human population. Genetic approaches to elucidate the genetics underlying the acquired forms of cardiomyopathies, including genome-wide association studies, have been largely unsuccessful, resulting in limited knowledge as to the contribution of genetic variations for this important disease. METHODS AND RESULTS Using the β-adrenergic agonist isoproterenol as a specific pathological stressor to circumvent the problem of etiologic heterogeneity, we performed a genome-wide association study for genes influencing cardiac hypertrophy and fibrosis in a large panel of inbred mice. Our analyses revealed 7 significant loci and 17 suggestive loci, containing an average of 14 genes, affecting cardiac hypertrophy, fibrosis, and surrogate traits relevant to heart failure. Several loci contained candidate genes which are known to contribute to Mendelian cardiomyopathies in humans or have established roles in cardiac pathology based on molecular or genetic studies in mouse models. In particular, we identify Abcc6 as a novel gene underlying a fibrosis locus by validating that an allele with a splice mutation of Abcc6 dramatically and rapidly promotes isoproterenol-induced cardiac fibrosis. CONCLUSIONS Genetic variants significantly contribute to the phenotypic heterogeneity of stress-induced cardiomyopathy. Systems genetics is an effective approach to identify genes and pathways underlying the specific pathological features of cardiomyopathies. Abcc6 is a previously unrecognized player in the development of stress-induced cardiac fibrosis.
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Affiliation(s)
- Christoph D Rau
- From the Department of Microbiology, Immunology and Molecular Genetics, Department of Human Genetics (C.D.R., R.A., M.R., A.J.L.), Department of Medicine, Division of Cardiology, David Geffen School of Medicine (J.W., L.M., A.J.L.), and Departments of Anesthesiology, Physiology, and Medicine, Cardiovascular Research Laboratories, David Geffen School of Medicine (S.R., Y.W.), University of California, Los Angeles, CA
| | - Jessica Wang
- From the Department of Microbiology, Immunology and Molecular Genetics, Department of Human Genetics (C.D.R., R.A., M.R., A.J.L.), Department of Medicine, Division of Cardiology, David Geffen School of Medicine (J.W., L.M., A.J.L.), and Departments of Anesthesiology, Physiology, and Medicine, Cardiovascular Research Laboratories, David Geffen School of Medicine (S.R., Y.W.), University of California, Los Angeles, CA
| | - Rozeta Avetisyan
- From the Department of Microbiology, Immunology and Molecular Genetics, Department of Human Genetics (C.D.R., R.A., M.R., A.J.L.), Department of Medicine, Division of Cardiology, David Geffen School of Medicine (J.W., L.M., A.J.L.), and Departments of Anesthesiology, Physiology, and Medicine, Cardiovascular Research Laboratories, David Geffen School of Medicine (S.R., Y.W.), University of California, Los Angeles, CA
| | - Milagros C Romay
- From the Department of Microbiology, Immunology and Molecular Genetics, Department of Human Genetics (C.D.R., R.A., M.R., A.J.L.), Department of Medicine, Division of Cardiology, David Geffen School of Medicine (J.W., L.M., A.J.L.), and Departments of Anesthesiology, Physiology, and Medicine, Cardiovascular Research Laboratories, David Geffen School of Medicine (S.R., Y.W.), University of California, Los Angeles, CA
| | - Lisa Martin
- From the Department of Microbiology, Immunology and Molecular Genetics, Department of Human Genetics (C.D.R., R.A., M.R., A.J.L.), Department of Medicine, Division of Cardiology, David Geffen School of Medicine (J.W., L.M., A.J.L.), and Departments of Anesthesiology, Physiology, and Medicine, Cardiovascular Research Laboratories, David Geffen School of Medicine (S.R., Y.W.), University of California, Los Angeles, CA
| | - Shuxun Ren
- From the Department of Microbiology, Immunology and Molecular Genetics, Department of Human Genetics (C.D.R., R.A., M.R., A.J.L.), Department of Medicine, Division of Cardiology, David Geffen School of Medicine (J.W., L.M., A.J.L.), and Departments of Anesthesiology, Physiology, and Medicine, Cardiovascular Research Laboratories, David Geffen School of Medicine (S.R., Y.W.), University of California, Los Angeles, CA
| | - Yibin Wang
- From the Department of Microbiology, Immunology and Molecular Genetics, Department of Human Genetics (C.D.R., R.A., M.R., A.J.L.), Department of Medicine, Division of Cardiology, David Geffen School of Medicine (J.W., L.M., A.J.L.), and Departments of Anesthesiology, Physiology, and Medicine, Cardiovascular Research Laboratories, David Geffen School of Medicine (S.R., Y.W.), University of California, Los Angeles, CA.
| | - Aldons J Lusis
- From the Department of Microbiology, Immunology and Molecular Genetics, Department of Human Genetics (C.D.R., R.A., M.R., A.J.L.), Department of Medicine, Division of Cardiology, David Geffen School of Medicine (J.W., L.M., A.J.L.), and Departments of Anesthesiology, Physiology, and Medicine, Cardiovascular Research Laboratories, David Geffen School of Medicine (S.R., Y.W.), University of California, Los Angeles, CA.
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Miglionico R, Armentano MF, Carmosino M, Salvia AM, Cuviello F, Bisaccia F, Ostuni A. Dysregulation of gene expression in ABCC6 knockdown HepG2 cells. Cell Mol Biol Lett 2014; 19:517-26. [PMID: 25169437 PMCID: PMC6275862 DOI: 10.2478/s11658-014-0208-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Accepted: 08/20/2014] [Indexed: 01/31/2023] Open
Abstract
ABCC6 protein is an ATP-dependent transporter that is mainly found in the basolateral plasma membrane of hepatocytes. ABCC6 deficiency is the primary cause of several forms of ectopic mineralization syndrome. Mutations in the human ABCC6 gene cause pseudoxanthoma elasticum (PXE), an autosomal recessive disease characterized by ectopic calcification of the elastic fibers in dermal, ocular and vascular tissues. Mutations in the mouse ABCC6 gene were also associated with dystrophic cardiac calcification. Reduced levels of ABCC6 protein were found in a β-thalassemic mouse model. Moreover, some cases of generalized arterial calcification in infancy are due to ABCC6 mutations. In order to study the role of ABCC6 in the pathogenesis of ectopic mineralization, the expressions of genes involved in this process were evaluated in HepG2 cells upon stable knockdown of ABCC6 by small hairpin RNA (shRNA) technology. ABCC6 knockdown in HepG2 cells causes a significant upregulation of the genes promoting mineralization, such as TNAP, and a parallel downregulation of genes with anti-mineralization activity, such as NT5E, Fetuin A and Osteopontin. Although the absence of ABCC6 has been already associated with ectopic mineralization syndromes, this study is the first to show a direct relationship between reduced ABCC6 levels and the expression of pro-mineralization genes in hepatocytes.
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Affiliation(s)
- Rocchina Miglionico
- Department of Sciences, University of Basilicata, Viale dell’Ateneo Lucano 10, 85100 Potenza, Italy
| | | | - Monica Carmosino
- Department of Sciences, University of Basilicata, Viale dell’Ateneo Lucano 10, 85100 Potenza, Italy
| | - Antonella Maria Salvia
- Department of Sciences, University of Basilicata, Viale dell’Ateneo Lucano 10, 85100 Potenza, Italy
| | - Flavia Cuviello
- Department of Sciences, University of Basilicata, Viale dell’Ateneo Lucano 10, 85100 Potenza, Italy
| | - Faustino Bisaccia
- Department of Sciences, University of Basilicata, Viale dell’Ateneo Lucano 10, 85100 Potenza, Italy
| | - Angela Ostuni
- Department of Sciences, University of Basilicata, Viale dell’Ateneo Lucano 10, 85100 Potenza, Italy
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Prescott ET, Mungrue IN. ABCC6 Out From the Cold: Identification of the ABCC6 Substrate as a Therapy for Pseudoxanthoma Elasticum and Cardiovascular Disease. AUSTIN JOURNAL OF PHARMACOLOGY AND THERAPEUTICS 2014; 2:1027. [PMID: 27668282 PMCID: PMC5033050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Affiliation(s)
- Eugenia T Prescott
- Department of Pharmacology & Experimental Therapeutics; Louisiana State University-Health Sciences Center-New Orleans, USA
| | - Imran N Mungrue
- Department of Pharmacology & Experimental Therapeutics; Louisiana State University-Health Sciences Center-New Orleans, USA
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Bunyavanich S, Schadt EE, Himes BE, Lasky-Su J, Qiu W, Lazarus R, Ziniti JP, Cohain A, Linderman M, Torgerson DG, Eng CS, Pino-Yanes M, Padhukasahasram B, Yang JJ, Mathias RA, Beaty TH, Li X, Graves P, Romieu I, Navarro BDR, Salam MT, Vora H, Nicolae DL, Ober C, Martinez FD, Bleecker ER, Meyers DA, Gauderman WJ, Gilliland F, Burchard EG, Barnes KC, Williams LK, London SJ, Zhang B, Raby BA, Weiss ST. Integrated genome-wide association, coexpression network, and expression single nucleotide polymorphism analysis identifies novel pathway in allergic rhinitis. BMC Med Genomics 2014; 7:48. [PMID: 25085501 PMCID: PMC4127082 DOI: 10.1186/1755-8794-7-48] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Accepted: 06/04/2014] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Allergic rhinitis is a common disease whose genetic basis is incompletely explained. We report an integrated genomic analysis of allergic rhinitis. METHODS We performed genome wide association studies (GWAS) of allergic rhinitis in 5633 ethnically diverse North American subjects. Next, we profiled gene expression in disease-relevant tissue (peripheral blood CD4+ lymphocytes) collected from subjects who had been genotyped. We then integrated the GWAS and gene expression data using expression single nucleotide (eSNP), coexpression network, and pathway approaches to identify the biologic relevance of our GWAS. RESULTS GWAS revealed ethnicity-specific findings, with 4 genome-wide significant loci among Latinos and 1 genome-wide significant locus in the GWAS meta-analysis across ethnic groups. To identify biologic context for these results, we constructed a coexpression network to define modules of genes with similar patterns of CD4+ gene expression (coexpression modules) that could serve as constructs of broader gene expression. 6 of the 22 GWAS loci with P-value ≤ 1x10-6 tagged one particular coexpression module (4.0-fold enrichment, P-value 0.0029), and this module also had the greatest enrichment (3.4-fold enrichment, P-value 2.6 × 10-24) for allergic rhinitis-associated eSNPs (genetic variants associated with both gene expression and allergic rhinitis). The integrated GWAS, coexpression network, and eSNP results therefore supported this coexpression module as an allergic rhinitis module. Pathway analysis revealed that the module was enriched for mitochondrial pathways (8.6-fold enrichment, P-value 4.5 × 10-72). CONCLUSIONS Our results highlight mitochondrial pathways as a target for further investigation of allergic rhinitis mechanism and treatment. Our integrated approach can be applied to provide biologic context for GWAS of other diseases.
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Affiliation(s)
- Supinda Bunyavanich
- Department of Genetics and Genomic Sciences and Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, 10029 New York, NY, USA
- Division of Pediatric Allergy and Immunology, Department of Pediatrics, and Mindich Child Health and Development Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Eric E Schadt
- Department of Genetics and Genomic Sciences and Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, 10029 New York, NY, USA
| | - Blanca E Himes
- Channing Division of Network Medicine, Department of Medicine, Brigham & Women’s Hospital and Harvard Medical School, Boston, MA, USA
| | - Jessica Lasky-Su
- Channing Division of Network Medicine, Department of Medicine, Brigham & Women’s Hospital and Harvard Medical School, Boston, MA, USA
| | - Weiliang Qiu
- Channing Division of Network Medicine, Department of Medicine, Brigham & Women’s Hospital and Harvard Medical School, Boston, MA, USA
| | - Ross Lazarus
- Channing Division of Network Medicine, Department of Medicine, Brigham & Women’s Hospital and Harvard Medical School, Boston, MA, USA
- Medical Bioinformatics, Baker IDI, Melbourne, Australia
| | - John P Ziniti
- Channing Division of Network Medicine, Department of Medicine, Brigham & Women’s Hospital and Harvard Medical School, Boston, MA, USA
| | - Ariella Cohain
- Department of Genetics and Genomic Sciences and Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, 10029 New York, NY, USA
| | - Michael Linderman
- Department of Genetics and Genomic Sciences and Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, 10029 New York, NY, USA
| | - Dara G Torgerson
- Department of Medicine and Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA, USA
| | - Celeste S Eng
- Department of Medicine and Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA, USA
| | - Maria Pino-Yanes
- Department of Medicine and Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA, USA
- IBER de Enfermedades Respiratorias, Instituto de Salud Carlos III, Madrid, Spain
| | - Badri Padhukasahasram
- Center for Health Policy and Health Services Research, Henry Ford Health System, Detroit, MI, USA
| | - James J Yang
- Department of Public Health Sciences, Henry Ford Health System, Detroit, MI, USA
| | - Rasika A Mathias
- Departments of Medicine and Epidemiology, Johns Hopkins University, Baltimore, MD, USA
| | - Terri H Beaty
- Departments of Medicine and Epidemiology, Johns Hopkins University, Baltimore, MD, USA
| | - Xingnan Li
- Center for Genomics, Wake Forest University School of Medicine, Winston Salem, NC, USA
| | - Penelope Graves
- Arizona Respiratory Center and BIO5 Institute, University of Arizona, Tucson, AZ, USA
| | | | | | - M Towhid Salam
- Department of Preventive Medicine, University of Southern California, Los Angeles, CA, USA
| | - Hita Vora
- Department of Preventive Medicine, University of Southern California, Los Angeles, CA, USA
| | - Dan L Nicolae
- Department of Human Genetics, University of Chicago, Chicago, IL, USA
| | - Carole Ober
- Department of Human Genetics, University of Chicago, Chicago, IL, USA
| | - Fernando D Martinez
- Arizona Respiratory Center and BIO5 Institute, University of Arizona, Tucson, AZ, USA
| | - Eugene R Bleecker
- Center for Genomics, Wake Forest University School of Medicine, Winston Salem, NC, USA
| | - Deborah A Meyers
- Center for Genomics, Wake Forest University School of Medicine, Winston Salem, NC, USA
| | - W James Gauderman
- Department of Preventive Medicine, University of Southern California, Los Angeles, CA, USA
| | - Frank Gilliland
- Department of Preventive Medicine, University of Southern California, Los Angeles, CA, USA
| | - Esteban G Burchard
- Department of Medicine and Department of Bioengineering and Therapeutic Sciences, University of California San Francisco, San Francisco, CA, USA
| | - Kathleen C Barnes
- Departments of Medicine and Epidemiology, Johns Hopkins University, Baltimore, MD, USA
| | - L Keoki Williams
- Center for Health Policy and Health Services Research, Henry Ford Health System, Detroit, MI, USA
- Department of Internal Medicine, Henry Ford Health System, Detroit, MI, USA
| | - Stephanie J London
- Division of Intramural Research, Department of Health and Human Services, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle, Park, NC, USA
| | - Bin Zhang
- Department of Genetics and Genomic Sciences and Icahn Institute for Genomics and Multiscale Biology, Icahn School of Medicine at Mount Sinai, 10029 New York, NY, USA
| | - Benjamin A Raby
- Channing Division of Network Medicine, Department of Medicine, Brigham & Women’s Hospital and Harvard Medical School, Boston, MA, USA
| | - Scott T Weiss
- Channing Division of Network Medicine, Department of Medicine, Brigham & Women’s Hospital and Harvard Medical School, Boston, MA, USA
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Lau WL, Liu S, Vaziri ND. Chronic kidney disease results in deficiency of ABCC6, the novel inhibitor of vascular calcification. Am J Nephrol 2014; 40:51-5. [PMID: 24994603 DOI: 10.1159/000365014] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 06/01/2014] [Indexed: 12/13/2022]
Abstract
BACKGROUND Chronic kidney disease (CKD) is associated with arterial medial calcification which plays a major role in the pathogenesis of cardiovascular disease in this population. Several factors are known to promote soft tissue and accelerated arterial calcification in CKD including systemic inflammation, altered calcium and phosphate homeostasis, hypertension, and deficiency of endogenous calcification inhibitors. The ABCC6 transporter (ATP-binding cassette subfamily C number 6), also known as multidrug resistance-associated protein 6 (MRP6), is highly expressed in the liver and kidney. Mutation of ABCC6 results in pseudoxanthoma elasticum, an inherited disorder characterized by arterial and soft tissue calcification. Given the prevalence of arterial medial calcification in CKD, the present study was undertaken to test the hypothesis that CKD may lead to acquired ABCC6 deficiency. METHODS CKD was induced via 5/6 nephrectomy in male Sprague-Dawley rats and by adenine-containing diet to cause chronic interstitial nephropathy in female DBA/2J mice. Sham-operated rats and mice fed regular diet served as controls. Liver and kidney tissues were harvested and processed for ABCC6 protein and mRNA analysis. RESULTS ABCC6 protein levels were significantly reduced in the liver and kidney tissues from CKD rats and mice. However, ABCC6 mRNA levels were unchanged, pointing to post-transcriptional or post-translational mechanisms for the observed ABCC6 deficiency. Additionally, plasma levels of the calcification inhibitor fetuin-A were significantly decreased in CKD animals compared to controls. CONCLUSIONS CKD results in acquired ABCC6 transporter deficiency. To our knowledge this abnormality has not been previously reported and may contribute to CKD-associated vascular and soft tissue calcification.
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Affiliation(s)
- Wei Ling Lau
- Division of Nephrology and Hypertension, Department of Medicine, University of California, Irvine, Calif., USA
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Li Q, Guo H, Chou DW, Berndt A, Sundberg JP, Uitto J. Mouse models for pseudoxanthoma elasticum: genetic and dietary modulation of the ectopic mineralization phenotypes. PLoS One 2014; 9:e89268. [PMID: 24586646 PMCID: PMC3929712 DOI: 10.1371/journal.pone.0089268] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Accepted: 01/17/2014] [Indexed: 11/25/2022] Open
Abstract
Pseudoxanthoma elasticum (PXE), a heritable ectopic mineralization disorder, is caused by mutations in the ABCC6 gene. Null mice (Abcc6−/−) recapitulate the genetic, histopathologic and ultrastructural features of PXE, and they demonstrate early and progressive mineralization of vibrissae dermal sheath, which serves as a biomarker of the overall mineralization process. Recently, as part of a mouse aging study at The Jackson Laboratory, 31 inbred mouse strains were necropsied, and two of them, KK/HlJ and 129S1/SvImJ, were noted to have vibrissae dermal mineralization similar to Abcc6−/− mice. These two strains were shown to harbor a single nucleotide polymorphism (rs32756904) in the Abcc6 gene, which resulted in out-of-frame splicing and marked reduction in ABCC6 protein expression in the liver of these mice. The same polymorphism is present in two additional mouse strains, DBA/2J and C3H/HeJ, with similar reduction in Abcc6 protein levels, yet these mice did not demonstrate tissue mineralization when kept on standard rodent diet. However, all four mouse strains, when placed on experimental diet enriched in phosphate and low in magnesium, developed extensive ectopic mineralization. These results indicate that the genetic background of mice and the mineral composition of their diet can profoundly modulate the ectopic mineralization process predicated on mutations in the Abcc6 gene. These mice provide novel model systems to study the pathomechanisms and the reasons for strain background on phenotypic variability of PXE.
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Affiliation(s)
- Qiaoli Li
- Department of Dermatology and Cutaneous Biology, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - Haitao Guo
- Department of Dermatology and Cutaneous Biology, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - David W. Chou
- Department of Dermatology and Cutaneous Biology, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
| | - Annerose Berndt
- Department of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania, United States of America
| | - John P. Sundberg
- The Jackson Laboratory, Bar Harbor, Maine, United States of America
| | - Jouni Uitto
- Department of Dermatology and Cutaneous Biology, Thomas Jefferson University, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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Bennett BJ, Romanoski CE, Lusis AJ. Network-centered view of coronary artery disease. Expert Rev Cardiovasc Ther 2014; 5:1095-103. [DOI: 10.1586/14779072.5.6.1095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Brampton C, Aherrahrou Z, Chen LH, Martin L, Bergen AA, Gorgels TG, Erdfdi J, Schunkert H, Szabó Z, Váradi A, Le Saux O. The level of hepatic ABCC6 expression determines the severity of calcification after cardiac injury. THE AMERICAN JOURNAL OF PATHOLOGY 2014; 184:159-70. [PMID: 24479134 PMCID: PMC3873484 DOI: 10.1016/j.ajpath.2013.09.015] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 09/18/2013] [Indexed: 12/22/2022]
Abstract
Because vascular or cardiac mineralization is inversely correlated with morbidity and long-term survival, we investigated the role of ABCC6 in the calcification response to cardiac injury in mice. By using two models of infarction, nonischemic cryoinjury and the pathologically relevant coronary artery ligation, we confirmed a large propensity to acute cardiac mineralization in Abcc6−/− mice. Furthermore, when the expression of ABCC6 was reduced to approximately 38% of wild-type levels in Abcc6+/− mice, no calcium deposits in injured cardiac tissue were observed. In addition, we used a gene therapy approach to deliver a functional human ABCC6 via hydrodynamic tail vein injection to approximately 13% of mouse hepatocytes, significantly reducing the calcification response to cardiac cryoinjury. We observed that the level and distribution of known regulators of mineralization, such as osteopontin and matrix Gla protein, but not osteocalcin, were concomitant to the level of hepatic expression of human and mouse ABCC6. We notably found that undercarboxylated matrix Gla protein precisely colocalized within areas of mineralization, whereas osteopontin was more diffusely distributed in the area of injury, suggesting a prominent association for matrix Gla protein and osteopontin in ABCC6-related dystrophic cardiac calcification. This study showed that the expression of ABCC6 in liver is an important determinant of calcification in cardiac tissues in response to injuries and is associated with changes in the expression patterns of regulators of mineralization.
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Affiliation(s)
- Christopher Brampton
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii
| | - Zouhair Aherrahrou
- Institute for Integrative and Experimental Genomics, German Centre for Cardiovascular Research, partner site Lübeck/Hamburg/Kiel, University of Luebeck, Luebeck, Germany
| | - Li-Hsieh Chen
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii
| | - Ludovic Martin
- Integrated Neurovascular and Mitochondrial Biology, L’UNAM University, UMR CNRS/INSERM, Angers School of Medicine, Angers, France
| | - Arthur A.B. Bergen
- Department of Molecular Ophthalmogenetics, Netherlands Institute for Neuroscience, Amsterdam, the Netherlands
- Department of Clinical Genetics, Academic Medical Center, Amsterdam, the Netherlands
- Department of Ophthalmology, Academic Medical Center, Amsterdam, the Netherlands
| | - Theo G.M.F. Gorgels
- Department of Molecular Ophthalmogenetics, Netherlands Institute for Neuroscience, Amsterdam, the Netherlands
| | - Jeannette Erdfdi
- Institute for Integrative and Experimental Genomics, German Centre for Cardiovascular Research, partner site Lübeck/Hamburg/Kiel, University of Luebeck, Luebeck, Germany
| | - Heribert Schunkert
- German Heart Center Munich, German Centre for Cardiovascular Research, partner site Munich Heart Alliance, Munich, Germany
| | - Zalán Szabó
- Institute of Enzymology, Hungarian Academy of Sciences, Budapest, Hungary
| | - András Váradi
- Institute of Enzymology, Hungarian Academy of Sciences, Budapest, Hungary
| | - Olivier Le Saux
- Department of Cell and Molecular Biology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii
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Analysis of allele-specific expression in mouse liver by RNA-Seq: a comparison with Cis-eQTL identified using genetic linkage. Genetics 2013; 195:1157-66. [PMID: 24026101 DOI: 10.1534/genetics.113.153882] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
We report an analysis of allele-specific expression (ASE) and parent-of-origin expression in adult mouse liver using next generation sequencing (RNA-Seq) of reciprocal crosses of heterozygous F1 mice from the parental strains C57BL/6J and DBA/2J. We found a 60% overlap between genes exhibiting ASE and putative cis-acting expression quantitative trait loci (cis-eQTL) identified in an intercross between the same strains. We discuss the various biological and technical factors that contribute to the differences. We also identify genes exhibiting parental imprinting and complex expression patterns. Our study demonstrates the importance of biological replicates to limit the number of false positives with RNA-Seq data.
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Kirsch AH, Smaczny N, Riegelbauer V, Sedej S, Hofmeister A, Stojakovic T, Goessler W, Brodmann M, Pilger E, Rosenkranz AR, Eller K, Eller P. Regulatory T cells improve nephrocalcinosis but not dystrophic cardiac calcinosis in DBA/2 mice. THE AMERICAN JOURNAL OF PATHOLOGY 2013; 183:382-90. [PMID: 23746654 DOI: 10.1016/j.ajpath.2013.04.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 04/17/2013] [Accepted: 04/24/2013] [Indexed: 12/24/2022]
Abstract
Nephrocalcinosis is characterized by aberrant deposition of calcium in the kidneys and is seen in phosphate nephropathy, primary hyperparathyroidism, and distal renal tubular acidosis. To further evaluate the specific pathophysiologic role of T cells in ectopic calcification, we used DBA/2 mice that are prone to develop nephrocalcinosis and dystrophic cardiac calcinosis. Female DBA/2 mice were depleted of T cells (n = 10) or regulatory T cells (Tregs) (n = 15) using either an anti-CD3ɛ or an anti-CD25 monoclonal antibody and compared with isotype-treated controls (n = 9; n = 15), respectively. After this immunomodulation, the DBA/2 mice were given a high-phosphate diet for 9 days and the degree of calcification was assessed by microcomputed tomography. Successful depletion was confirmed by flow cytometry of splenocytes. In DBA/2 mice, the high-phosphate diet induced a phenotype of nephrocalcinosis and dystrophic cardiac calcinosis. T-cell depletion significantly increased renal calcification in microcomputed tomography (P = 0.022). Concordantly, Treg depletion significantly deteriorated acute phosphate nephropathy (P = 0.039) and was associated with a significantly increased mortality rate (P = 0.004). Immunomodulation had no impact on the amount of cardiac calcification. Semiquantitative histopathologic evaluations with Alizarin Red staining independently confirmed the respective radiologic measurements. In summary, our data suggest a pivotal role of T cells, particularly Tregs, in the progression of nephrocalcinosis and emphasize the fact that inflammation deteriorates the outcome in acute phosphate nephropathy.
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Affiliation(s)
- Alexander H Kirsch
- Clinical Division of Nephrology, Department of Internal Medicine, Medical University of Graz, Graz, Austria
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Aherrahrou Z, Schunkert H. Genetics of atherosclerosis and vascular calcification go hand-in-hand. Atherosclerosis 2013; 228:325-6. [DOI: 10.1016/j.atherosclerosis.2012.10.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/01/2012] [Accepted: 10/04/2012] [Indexed: 10/27/2022]
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van Nas A, Pan C, Ingram-Drake LA, Ghazalpour A, Drake TA, Sobel EM, Papp JC, Lusis AJ. The systems genetics resource: a web application to mine global data for complex disease traits. Front Genet 2013; 4:84. [PMID: 23730305 PMCID: PMC3657633 DOI: 10.3389/fgene.2013.00084] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2012] [Accepted: 04/25/2013] [Indexed: 11/13/2022] Open
Abstract
The Systems Genetics Resource (SGR) (http://systems.genetics.ucla.edu) is a new open-access web application and database that contains genotypes and clinical and intermediate phenotypes from both human and mouse studies. The mouse data include studies using crosses between specific inbred strains and studies using the Hybrid Mouse Diversity Panel. SGR is designed to assist researchers studying genes and pathways contributing to complex disease traits, including obesity, diabetes, atherosclerosis, heart failure, osteoporosis, and lipoprotein metabolism. Over the next few years, we hope to add data relevant to deafness, addiction, hepatic steatosis, toxin responses, and vascular injury. The intermediate phenotypes include expression array data for a variety of tissues and cultured cells, metabolite levels, and protein levels. Pre-computed tables of genetic loci controlling intermediate and clinical phenotypes, as well as phenotype correlations, are accessed via a user-friendly web interface. The web site includes detailed protocols for all of the studies. Data from published studies are freely available; unpublished studies have restricted access during their embargo period.
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Affiliation(s)
- Atila van Nas
- Department of Human Genetics, University of California Los Angeles, Los Angeles, CA, USA
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