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Abecasis J, Lopes P, Maltes S, Santos RR, Ferreira A, Ribeiras R, Andrade MJ, Uva MS, Gil V, Félix A, Ramos S, Cardim N. Histopathological myocardial changes in patients with severe aortic stenosis referred for surgical valve replacement: a cardiac magnetic resonance correlation study. Eur Heart J Cardiovasc Imaging 2024; 25:839-848. [PMID: 38246861 DOI: 10.1093/ehjci/jeae023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 01/08/2024] [Accepted: 01/16/2024] [Indexed: 01/23/2024] Open
Abstract
AIMS Myocardial fibrosis (MF) takes part in left ventricular (LV) remodelling in patients with aortic stenosis (AS), driving the transition from hypertrophy to heart failure. The structural changes that occur in this transition are not fully enlightened. The aim of this study was to describe histopathological changes at endomyocardial biopsy (EMB) in patients with severe AS referred to surgical aortic valve replacement (AVR) and to correlate them with LV tissue characterization from pre-operative cardiac magnetic resonance (CMR). METHODS AND RESULTS One-hundred fifty-eight patients [73 (68-77) years, 50% women] were referred for surgical AVR because of severe symptomatic AS, with pre-operative CMR (n = 143) with late gadolinium enhancement (LGE), T1, T2 mapping, and extracellular volume fraction (ECV) quantification. Intra-operative septal EMB was obtained in 129 patients. MF was assessed through Masson's Trichrome histochemistry. Immunohistochemistry was performed for both inflammatory cells and extracellular matrix (ECM) characterization (Type I Collagen, Fibronectin, Tenascin C). Non-ischaemic LGE was present in 106 patients (67.1%) [median fraction: 5.0% (2.0-9.7)]. Native T1 was above normal [1053 ms (1024-1071)] and T2 within the normal range [39.3 ms (37.3-42.0)]. Median MF was 11.9% (6.54-19.97), with predominant type I collagen perivascular distribution (95.3%). Sub-endocardial cardiomyocyte ischaemic-like changes were identified in 45% of EMB. There was no inflammation, despite ECM remodelling expression. MF quantification at EMB was correlated with LGE mass (P = 0.008) but not with global ECV (P = 0.125). CONCLUSION Patients with severe symptomatic AS referred for surgical AVR have unspecific histological myocardial changes, including signs of cardiomyocyte ischaemic insult. ECM remodelling is ongoing, with MF heterogeneity. These features may be recognized by comprehensive CMR protocols. However, no single CMR parameter captures the burden of MF and histological myocardial changes in this setting.
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Affiliation(s)
- João Abecasis
- Cardiology Department, Hospital de Santa Cruz, Lisboa, Portugal
- Nova Medical School, Lisboa, Portugal
| | - Pedro Lopes
- Cardiology Department, Hospital de Santa Cruz, Lisboa, Portugal
| | - Sergio Maltes
- Cardiology Department, Hospital de Santa Cruz, Lisboa, Portugal
| | | | | | - Regina Ribeiras
- Cardiology Department, Hospital de Santa Cruz, Lisboa, Portugal
| | | | - Miguel Sousa Uva
- Cardiac Surgery Department, Hospital de Santa Cruz, Lisboa, Portugal
| | - Victor Gil
- Hospital da Luz, Lisboa, Portugal
- Faculdade de Medicina, Universidade Católica, Lisboa
| | - Ana Félix
- Nova Medical School, Lisboa, Portugal
- Pathology Department, IPOFG, Lisboa, Portugal
| | - Sancia Ramos
- Pathology Department, Hospital de Santa Cruz, Lisboa, Portugal
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Abecasis J, Maltês S, Santos RR, Lopes P, Manso RT, Gil V, Cardim N, Ramos S, Félix A. Subendocardial "ischemic-like" state in patients with severe aortic stenosis: Insights from myocardial histopathology and ultrastructure. Cardiovasc Pathol 2024; 69:107589. [PMID: 38029890 DOI: 10.1016/j.carpath.2023.107589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Revised: 11/16/2023] [Accepted: 11/17/2023] [Indexed: 12/01/2023] Open
Abstract
BACKGROUND Myocardial adaptation to severe aortic stenosis (AS) is a complex process that involves myocardial fibrosis (MF) beyond cardiomyocyte hypertrophy. Perfusion impairment is believed to be involved in myocardial remodeling in chronic pressure overload. AIM To describe morphological and ultrastructural myocardial changes at endomyocardial tissue sampling, possibly reflecting subendocardial ischemia, in a group of patients with severe AS referred to surgical aortic valve replacement (AVR), with no previous history of ischemic cardiomyopathy. METHODS One-hundred-fifty-eight patients (73 [68-77] years, 50% women) referred for surgical AVR because of severe symptomatic AS with preoperative clinical and imaging study and no previous history of ischemic cardiomyopathy. Intra-operative septal endomyocardial sampling was obtained in 129 patients. Tissue sections were stained with Masson´s Trichrome for MF quantification and periodic acid-Schiff (PAS) staining was performed to assess the presence of intracellular glycogen. Ultrastructure was analyzed through Transmission electron microscopy (TEM). RESULTS MF totalized a median fraction of 11.90% (6.54-19.97%) of EMB, with highly prevalent perivascular involvement (95.3%). None of the samples had histological evidence of myocardial infarction. In 58 patients (45%) we found subendocardial groups of cardiomyocytes with cytoplasmatic enlargement, vacuolization and myofiber derangement, surrounded by extensive interstitial fibrosis. These cardiomyocytes were PAS positive, PAS-diastase resistant and Alcian Blue/PAS indicative of the presence of neutral intracellular glyco-saccharides. At TEM there were signs of cardiomyocyte degeneration with sarcomere disorganization and reduction, organelle rarefaction but no signs of intracellular specific accumulation. CONCLUSION Almost half of the patients with severe AS referred for surgical AVR have histological and ultrastructural signs of subendocardial cardiomyocyte ischemic insult. It might be inferred that local perfusion imbalance contributes to myocardial remodeling and fibrosis in chronic pressure overload.
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Affiliation(s)
- João Abecasis
- Cardiology Department, Hospital de Santa Cruz, Lisboa, Portugal; Nova Medical School, Lisboa, Portugal.
| | - Sergio Maltês
- Cardiology Department, Hospital de Santa Cruz, Lisboa, Portugal
| | | | - Pedro Lopes
- Cardiology Department, Hospital de Santa Cruz, Lisboa, Portugal
| | | | - Victor Gil
- Hospital da Luz, Lisboa, Portugal; Faculdade de Medicina, Universidade Católica, Lisboa, Portugal
| | | | - Sancia Ramos
- Pathology Department, Hospital de Santa Cruz, Lisboa, Portugal
| | - Ana Félix
- Nova Medical School, Lisboa, Portugal; Pathology Department, IPOFG, Lisboa, Portugal
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Bouraoui A, Louzada RA, Aimeur S, Waeytens J, Wien F, My-Chan Dang P, Bizouarn T, Dupuy C, Baciou L. New insights in the molecular regulation of the NADPH oxidase 2 activity: Negative modulation by Poldip2. Free Radic Biol Med 2023; 199:113-125. [PMID: 36828293 DOI: 10.1016/j.freeradbiomed.2023.02.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/26/2022] [Revised: 02/06/2023] [Accepted: 02/21/2023] [Indexed: 02/24/2023]
Abstract
Poldip2 was shown to be involved in oxidative signaling to ensure certain biological functions. It was proposed that, in VSMC, by interaction with the Nox4-associated membrane protein p22phox, Poldip2 stimulates the level of reactive oxygen species (ROS) production. In vitro, with fractionated membranes from HEK393 cells over-expressing Nox4, we confirmed the up-regulation of NADPH oxidase 4 activity by the recombinant and purified Poldip2. Besides Nox4, the Nox1, Nox2, or Nox3 isoforms are also established partners of the p22phox protein raising the question of their regulation by Poldip2 and of the effect in cells expressing simultaneously different Nox isoforms. In this study, we have addressed this issue by investigating the potential regulatory role of Poldip2 on NADPH oxidase 2, present in phagocyte cells. Unexpectedly, the effect of Poldip2 on phagocyte NADPH oxidase 2 was opposite to that observed on NADPH oxidase 4. Using membranes from circulating resting neutrophils, the ROS production rate of NADPH oxidase 2 was down-regulated by Poldip2 (2.5-fold). The down-regulation effect could not be correlated to the interaction of Poldip2 with p22phox but rather, to the interaction of Poldip2 with the p47phox protein, one of the regulatory proteins of the phagocyte NADPH oxidase. Our results show that the interaction of Poldip2 with p47phox constitutes a novel regulatory mechanism that can negatively modulate the activity of NADPH oxidase 2 by trapping the so-called "adaptor" subunit of the complex. Poldip2 could act as a tunable switch capable of specifically regulating the activities of NADPH oxidases. This selective regulatory role of Poldip2, positive for Nox4 or negative for Nox2 could orchestrate the level and the type of ROS generated by Nox enzymes in the cells.
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Affiliation(s)
- Aicha Bouraoui
- Université Paris-Saclay, Institut de Chimie Physique UMR 8000, CNRS, 91405, Orsay Cedex, France
| | - Ruy Andrade Louzada
- Université Paris Saclay, UMR 9019 CNRS, Gustave Roussy, 94800, Villejuif, France
| | - Sana Aimeur
- Université Paris-Saclay, Institut de Chimie Physique UMR 8000, CNRS, 91405, Orsay Cedex, France
| | - Jehan Waeytens
- Université Paris-Saclay, Institut de Chimie Physique UMR 8000, CNRS, 91405, Orsay Cedex, France; Structure et Fonction des Membranes Biologiques, Université libre de Bruxelles, Bruxelles, Belgium
| | - Frank Wien
- DISCO beamline, Synchrotron SOLEIL, Campus Paris-Saclay, 91192, Gif-sur-Yvette Cedex, France
| | - Pham My-Chan Dang
- INSERM U1149, CNRS ERL8252, Centre de Recherche sur l'Inflammation, Université de Paris, Laboratoire d'Excellence Inflamex, Faculté de Médecine, Site Xavier Bichat, Paris, F-75018, France
| | - Tania Bizouarn
- Université Paris-Saclay, Institut de Chimie Physique UMR 8000, CNRS, 91405, Orsay Cedex, France
| | - Corinne Dupuy
- Université Paris Saclay, UMR 9019 CNRS, Gustave Roussy, 94800, Villejuif, France
| | - Laura Baciou
- Université Paris-Saclay, Institut de Chimie Physique UMR 8000, CNRS, 91405, Orsay Cedex, France.
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4
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Gama FF, Patel K, Bennett J, Aziminia N, Pugliese F, Treibel T. Myocardial Evaluation in Patients with Aortic Stenosis by Cardiac Computed Tomography. ROFO-FORTSCHR RONTG 2023; 195:506-513. [PMID: 36854383 DOI: 10.1055/a-1999-7271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
BACKGROUND Aortic valve stenosis (AVS) is one of the most prevalent pathologies affecting the heart that can curtail expected survival and quality of life if not managed appropriately. CURRENT STATUS Cardiac computed tomography (CT) has long played a central role in this subset, mostly for severity assessment and for procedural planning. Although not as widely accepted as other imaging modalities for functional myocardial assessment [i. e., transthoracic echocardiogram (TTE), cardiac magnetic resonance (CMR)], this technique has recently increased its clinical application in this regard. FUTURE OUTLOOK The ability to provide morphological, functional, tissue, and preprocedural information highlights the potential of the "all-in-one" concept of cardiac CT as a potential reality for the near future for AVS assessment. In this review article, we sought to analyze the current applications of cardiac CT that allow a full comprehensive evaluation of aortic valve disease. KEY POINTS · Noninvasive myocardial tissue characterization stopped being an exclusive feature of cardiac magnetic resonance.. · Emerging acquisition methods make cardiac CT an accurate and widely accessible imaging modality.. · Cardiac CT has the potential to become a "one-stop" exam for comprehensive aortic stenosis assessment.. CITATION FORMAT · Gama FF, Patel K, Bennett J et al. Myocardial Evaluation in Patients with Aortic Stenosis by Cardiac Computed Tomography. Fortschr Röntgenstr 2023; DOI: 10.1055/a-1999-7271.
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Affiliation(s)
- Francisco F Gama
- Cardiology, Hospital Centre of West Lisbon Campus Hospital of Santa Cruz, Lisboa, Portugal.,Cardiac Imaging, Barts Health NHS Trust, London, United Kingdom of Great Britain and Northern Ireland
| | - Kush Patel
- Cardiac Imaging, Barts Health NHS Trust, London, United Kingdom of Great Britain and Northern Ireland
| | - Jonathan Bennett
- Cardiac Imaging, Barts Health NHS Trust, London, United Kingdom of Great Britain and Northern Ireland
| | - Nikoo Aziminia
- Cardiac Imaging, Barts Health NHS Trust, London, United Kingdom of Great Britain and Northern Ireland
| | - Francesca Pugliese
- Cardiac Imaging, Barts Health NHS Trust, London, United Kingdom of Great Britain and Northern Ireland
| | - Thomas Treibel
- Cardiac Imaging, Barts Health NHS Trust, London, United Kingdom of Great Britain and Northern Ireland
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5
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Cramariuc D, Bahlmann E, Egstrup K, Rossebø AB, Ray S, Kesäniemi YA, Nienaber CA, Gerdts E. Prognostic impact of impaired left ventricular midwall function during progression of aortic stenosis. Echocardiography 2020; 38:31-38. [PMID: 33146452 DOI: 10.1111/echo.14916] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2020] [Revised: 10/08/2020] [Accepted: 10/18/2020] [Indexed: 10/23/2022] Open
Abstract
OBJECTIVE In hypertension, indexes of midwall left ventricular (LV) function may identify patients at higher cardiovascular (CV) risk independent of normal LV ejection fraction (EF). We analyzed the association of baseline and new-onset LV midwall dysfunction with CV outcome in a large population of patients with asymptomatic aortic stenosis (AS). METHODS One thousand four hundred seventy-eight patients with asymptomatic AS and normal EF (≥50%) at baseline in the Simvastatin Ezetimibe in Aortic Stenosis (SEAS) study were followed for a median of 4.3 years. LV systolic function was assessed by biplane EF and midwall shortening (MWS, low if <14% in men/16% in women) at baseline and annual echocardiographic examinations. RESULTS One hundred twenty-three CV deaths and heart failure hospitalizations occurred during follow-up. In Cox analyses, adjusting for age, gender, body mass index, hypertension, EF, AS severity, LV hypertrophy and systemic arterial compliance, low baseline MWS predicted 61% higher risk of a major CV event and a twofold higher risk of death and heart failure hospitalization (P < .05). New-onset low MWS developed in 574 patients, particularly in elderly women with higher blood pressure and more severe AS (P < .05). In time-varying Cox analysis, new-onset low MWS was associated with a twofold higher risk of CV death and heart failure hospitalization, independent of changes over time in EF, AS severity, LV hypertrophy and systemic arterial compliance (P < .05). CONCLUSIONS Low MWS develops in a large proportion of patients with AS and normal EF during valve disease progression and is a marker of increased CV risk.
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Affiliation(s)
- Dana Cramariuc
- Department of Heart Disease, Haukeland University Hospital, Bergen, Norway
| | - Edda Bahlmann
- Department of Cardiology, Asklepios Clinic St. Georg, Hamburg, Germany
| | - Kenneth Egstrup
- Department of Medicine, Svendborg Hospital, Svendborg, Denmark
| | - Anne B Rossebø
- Department of Cardiology, Oslo University Hospital, Oslo, Norway
| | - Simon Ray
- University Hospital of South Manchester, Manchester, UK
| | - Yrjö Antero Kesäniemi
- Research Unit of Internal medicine, Medical Research Center Oulu, Oulu University Hospital and University of Oulu, Oulu, Finland
| | | | - Eva Gerdts
- Department of Clinical Science, University of Bergen, Bergen, Norway
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6
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Pushpakumar S, Ren L, Juin SK, Majumder S, Kulkarni R, Sen U. Methylation-dependent antioxidant-redox imbalance regulates hypertensive kidney injury in aging. Redox Biol 2020; 37:101754. [PMID: 33080442 PMCID: PMC7575806 DOI: 10.1016/j.redox.2020.101754] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 08/20/2020] [Accepted: 10/08/2020] [Indexed: 12/14/2022] Open
Abstract
The prevalence of hypertension increases with age, and oxidative stress is a major contributing factor to the pathogenesis of hypertension-induced kidney damage in aging. The nicotinamide adenine dinucleotide phosphate (NADPH) family is one of the major sources of reactive oxygen species (ROS) generation, and several NADPH oxidase isoforms are highly expressed in the kidney. Although epigenetic protein modification plays a role in organ injury, the methylation of the oxidant-antioxidant defense system and their role in hypertension-induced kidney damage in aging remains underexplored. The present study investigated the role of NADPH oxidase 4, superoxide dismutases (SODs), catalase, and NOS in Ang-II induced kidney damage in aging. Wild type (WT, C57BL/6J) mice aged 12-14 and 75-78 weeks were used and treated with or without Ang-II (1000 ng/kg/min) for 4 weeks with control mice receiving saline. Aged mice with or without Ang-II exhibited higher mean BP, lower renal blood flow, and decreased renal vascular density compared to young mice. While superoxide, 4-HNE, p22phox, Nox4, iNOS were increased in the aged kidney, the expression of eNOS, MnSOD, CuSOD, catalase, Sirt1, and -3 as well as the ratio of GSH/GSSG, and activities of SODs and catalase were decreased compared to young control mice. The changes further deteriorated with Ang-II treatment. In Ang-II treated aged mice, the expressions of DNMTs were increased and associated with increased methylation of SODs, Sirt1, and Nox4. We conclude that hypermethylation of antioxidant enzymes in the aged kidney during hypertension worsens redox imbalance leading to kidney damage.
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Affiliation(s)
- Sathnur Pushpakumar
- Department of Physiology, University of Louisville School of Medicine, Louisville, KY, USA
| | - Lu Ren
- Department of Cancer Biology, University of Cincinnati College of Medicine, Cincinnati, OH, USA
| | - Subir Kumar Juin
- Department of Physiology, University of Louisville School of Medicine, Louisville, KY, USA
| | - Suravi Majumder
- Department of Physiology, University of Louisville School of Medicine, Louisville, KY, USA
| | - Rohan Kulkarni
- Department of Physiology, University of Louisville School of Medicine, Louisville, KY, USA
| | - Utpal Sen
- Department of Physiology, University of Louisville School of Medicine, Louisville, KY, USA.
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7
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Gao M, Lu W, Shu Y, Yang Z, Sun S, Xu J, Gan S, Zhu S, Qiu G, Zhuo F, Xu S, Wang Y, Chen J, Wu X, Huang J. Poldip2 mediates blood-brain barrier disruption and cerebral edema by inducing AQP4 polarity loss in mouse bacterial meningitis model. CNS Neurosci Ther 2020; 26:1288-1302. [PMID: 32790044 PMCID: PMC7702237 DOI: 10.1111/cns.13446] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2020] [Revised: 06/27/2020] [Accepted: 07/05/2020] [Indexed: 12/20/2022] Open
Abstract
Background Specific highly polarized aquaporin‐4 (AQP4) expression is reported to play a crucial role in blood‐brain barrier (BBB) integrity and brain water transport balance. The upregulation of polymerase δ‐interacting protein 2 (Poldip2) was involved in aggravating BBB disruption following ischemic stroke. This study aimed to investigate whether Poldip2‐mediated BBB disruption and cerebral edema formation in mouse bacterial meningitis (BM) model occur via induction of AQP4 polarity loss. Methods and Results Mouse BM model was induced by injecting mice with group B hemolytic streptococci via posterior cistern. Recombinant human Poldip2 (rh‐Poldip2) was administered intranasally at 1 hour after BM induction. Small interfering ribonucleic acid (siRNA) targeting Poldip2 was administered by intracerebroventricular (i.c.v) injection at 48 hours before BM induction. A specific inhibitor of matrix metalloproteinases (MMPs), UK383367, was administered intravenously at 0.5 hour before BM induction. Western blotting, immunofluorescence staining, quantitative real‐time PCR, neurobehavioral test, brain water content test, Evans blue (EB) permeability assay, transmission electron microscopy (TEM), and gelatin zymography were carried out. The results showed that Poldip2 was upregulated and AQP4 polarity was lost in mouse BM model. Both Poldip2 siRNA and UK383367 improved neurobehavioral outcomes, alleviated brain edema, preserved the integrity of BBB, and relieved the loss of AQP4 polarity in BM model. Rh‐Poldip2 upregulated the expression of MMPs and glial fibrillary acidic protein (GFAP) and downregulated the expression of β‐dystroglycan (β‐DG), zonula occludens‐1 (ZO‐1), occludin, and claudin‐5; whereas Poldip2 siRNA downregulated the expression of MMPs and GFAP, and upregulated β‐DG, ZO‐1, occludin, and claudin‐5. Similarly, UK383367 downregulated the expression of GFAP and upregulated the expression of β‐DG, ZO‐1, occludin, and claudin‐5. Conclusion Poldip2 inhibition alleviated brain edema and preserved the integrity of BBB partially by relieving the loss of AQP4 polarity via MMPs/β‐DG pathway.
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Affiliation(s)
- Meng Gao
- Department of Anatomy, Chongqing Medical University, Chongqing, China
| | - Weitian Lu
- Department of Anatomy, Chongqing Medical University, Chongqing, China.,Institute of Neuroscience, Chongqing Medical University, Chongqing, China
| | - Yue Shu
- Department of Anatomy, Chongqing Medical University, Chongqing, China
| | - Zhengyu Yang
- Department of Anatomy, Chongqing Medical University, Chongqing, China
| | - Shanquan Sun
- Department of Anatomy, Chongqing Medical University, Chongqing, China.,Institute of Neuroscience, Chongqing Medical University, Chongqing, China
| | - Jin Xu
- Department of Anatomy, Chongqing Medical University, Chongqing, China.,Institute of Neuroscience, Chongqing Medical University, Chongqing, China
| | - Shengwei Gan
- Department of Anatomy, Chongqing Medical University, Chongqing, China.,Institute of Neuroscience, Chongqing Medical University, Chongqing, China
| | - Shujuan Zhu
- Department of Anatomy, Chongqing Medical University, Chongqing, China.,Institute of Neuroscience, Chongqing Medical University, Chongqing, China
| | - Guoping Qiu
- Department of Anatomy, Chongqing Medical University, Chongqing, China.,Institute of Neuroscience, Chongqing Medical University, Chongqing, China
| | - Fei Zhuo
- Department of Anatomy, Chongqing Medical University, Chongqing, China.,Institute of Neuroscience, Chongqing Medical University, Chongqing, China
| | - Shiye Xu
- Department of Anatomy, Chongqing Medical University, Chongqing, China.,Institute of Neuroscience, Chongqing Medical University, Chongqing, China
| | - Yiying Wang
- Department of Anatomy, Chongqing Medical University, Chongqing, China
| | - Junhong Chen
- Department of Anatomy, Chongqing Medical University, Chongqing, China
| | - Xuan Wu
- Department of Neurosurgery, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China
| | - Juan Huang
- Department of Anatomy, Chongqing Medical University, Chongqing, China.,Institute of Neuroscience, Chongqing Medical University, Chongqing, China
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8
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Treibel TA, López B, González A, Menacho K, Schofield RS, Ravassa S, Fontana M, White SK, DiSalvo C, Roberts N, Ashworth MT, Díez J, Moon JC. Reappraising myocardial fibrosis in severe aortic stenosis: an invasive and non-invasive study in 133 patients. Eur Heart J 2019; 39:699-709. [PMID: 29020257 PMCID: PMC5888951 DOI: 10.1093/eurheartj/ehx353] [Citation(s) in RCA: 167] [Impact Index Per Article: 33.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 06/23/2017] [Indexed: 12/16/2022] Open
Abstract
Aims To investigate myocardial fibrosis (MF) in a large series of severe aortic stenosis (AS) patients using invasive biopsy and non-invasive imaging. Methods and results One hundred thirty-three patients with severe, symptomatic AS accepted for surgical aortic valve replacement underwent cardiovascular magnetic resonance (CMR) with late gadolinium enhancement (LGE) and extracellular volume fraction (ECV) quantification. Intra-operative left ventricular (LV) biopsies were performed by needle or scalpel, yielding tissue with (n = 53) and without endocardium (n = 80), and compared with 10 controls. Myocardial fibrosis occurred in three patterns: (i) thickened endocardium with a fibrotic layer; (ii) microscopic scars, with a subendomyocardial predominance; and (iii) diffuse interstitial fibrosis. Collagen volume fraction (CVF) was elevated (P < 0.001) compared with controls, and higher (P < 0.001) in endocardium-containing samples with a decreasing CVF gradient from the subendocardium (P = 0.001). Late gadolinium enhancement correlated with CVF (P < 0.001) but not ECV. Both LGE and ECV correlated independently (P < 0.001) with N-terminal pro-brain natriuretic peptide and high-sensitivity-troponin T. High ECV was also associated with worse LV remodelling, left ventricular ejection fraction and functional capacity. Combining high ECV and LGE better identified patients with more adverse LV remodelling, blood biomarkers and histological parameters, and worse functional capacity than each parameter alone. Conclusion Myocardial fibrosis in severe AS is complex, but three main patterns exist: endocardial fibrosis, microscars (mainly in the subendomyocardium), and diffuse interstitial fibrosis. Neither histological CVF nor the CMR parameters ECV and LGE capture fibrosis in its totality. A combined, multi-parametric approach with ECV and LGE allows best stratification of AS patients according to the response of the myocardial collagen matrix. ![]()
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Affiliation(s)
- Thomas A Treibel
- Cardiac Imaging, Barts Heart Centre, St. Bartholomew's Hospital, 2nd Floor, King George V Block, Barts Heart Centre, St. Bartholomew's Hospital, London EC1A 7BE, UK.,Institute for Cardiovascular Sciences, University College London, Gower Street, London WC1E 6BT, UK
| | - Begoña López
- Program of Cardiovascular Diseases, Center for Applied Medical Research, University of Navarra, Avda/ Pío XII 55, 31008, Pamplona, Spain.,CIBERCV, National Institute of Health Carlos III, C/ Monforte de Lemos 3-5, 28029, Madrid, Spain
| | - Arantxa González
- Program of Cardiovascular Diseases, Center for Applied Medical Research, University of Navarra, Avda/ Pío XII 55, 31008, Pamplona, Spain.,CIBERCV, National Institute of Health Carlos III, C/ Monforte de Lemos 3-5, 28029, Madrid, Spain
| | - Katia Menacho
- Cardiac Imaging, Barts Heart Centre, St. Bartholomew's Hospital, 2nd Floor, King George V Block, Barts Heart Centre, St. Bartholomew's Hospital, London EC1A 7BE, UK
| | - Rebecca S Schofield
- Cardiac Imaging, Barts Heart Centre, St. Bartholomew's Hospital, 2nd Floor, King George V Block, Barts Heart Centre, St. Bartholomew's Hospital, London EC1A 7BE, UK
| | - Susana Ravassa
- Program of Cardiovascular Diseases, Center for Applied Medical Research, University of Navarra, Avda/ Pío XII 55, 31008, Pamplona, Spain.,CIBERCV, National Institute of Health Carlos III, C/ Monforte de Lemos 3-5, 28029, Madrid, Spain
| | - Marianna Fontana
- Institute for Cardiovascular Sciences, University College London, Gower Street, London WC1E 6BT, UK
| | - Steven K White
- Institute for Cardiovascular Sciences, University College London, Gower Street, London WC1E 6BT, UK
| | - Carmelo DiSalvo
- Cardiac Imaging, Barts Heart Centre, St. Bartholomew's Hospital, 2nd Floor, King George V Block, Barts Heart Centre, St. Bartholomew's Hospital, London EC1A 7BE, UK
| | - Neil Roberts
- Cardiac Imaging, Barts Heart Centre, St. Bartholomew's Hospital, 2nd Floor, King George V Block, Barts Heart Centre, St. Bartholomew's Hospital, London EC1A 7BE, UK
| | - Michael T Ashworth
- Institute for Cardiovascular Sciences, University College London, Gower Street, London WC1E 6BT, UK.,Department of Histopathology, Great Ormond Street Hospital for Children National Health Service Trust, Great Ormond Street, London WC1N 3JH, UK
| | - Javier Díez
- Program of Cardiovascular Diseases, Center for Applied Medical Research, University of Navarra, Avda/ Pío XII 55, 31008, Pamplona, Spain.,CIBERCV, National Institute of Health Carlos III, C/ Monforte de Lemos 3-5, 28029, Madrid, Spain.,Department of Cardiology and Cardiac Surgery, University of Navarra Clinic, Avda/ Pío XII 36, 31008, Pamplona, Spain
| | - James C Moon
- Cardiac Imaging, Barts Heart Centre, St. Bartholomew's Hospital, 2nd Floor, King George V Block, Barts Heart Centre, St. Bartholomew's Hospital, London EC1A 7BE, UK.,Institute for Cardiovascular Sciences, University College London, Gower Street, London WC1E 6BT, UK
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9
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Abstract
Aortic stenosis and diabetes mellitus are both progressive diseases which, if left untreated, result in significant morbidity and mortality. There is evidence that the prevalence of diabetes is substantially increased in patients with aortic stenosis and those with diabetes have increased rates of progression from mild to severe aortic stenosis. There are good data supporting the hypothesis that aortic stenosis and diabetes mellitus are associated with diabetes mellitus being detrimental towards the quality of life and survival of patients. Thus, a thorough understanding of the pathogenesis of both of these disease processes and the relationship between them aids in designing appropriate preventive and therapeutic approaches. This review aims to give a comprehensive and up-to-date insight into the influence of diabetes mellitus on patients with degenerative aortic stenosis, as well as the prognosis and therapeutic approach to these patients.
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Affiliation(s)
- Marko Banovic
- 1 Cardiology Clinic, University Clinical Center of Serbia, Belgrade, Serbia
- 2 Belgrade Medical School, University of Belgrade, Belgrade, Serbia
| | - Lavanya Athithan
- 3 Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
- 4 The NIHR Leicester Biomedical Research Centre, Glenfield Hospital, Leicester, UK
| | - Gerry P McCann
- 3 Department of Cardiovascular Sciences, University of Leicester, Leicester, UK
- 4 The NIHR Leicester Biomedical Research Centre, Glenfield Hospital, Leicester, UK
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10
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Abstract
Polymerase δ-interacting protein 2 (Poldip2) is a multifunctional protein originally described as a binding partner of the p50 subunit of DNA polymerase δ and proliferating cell nuclear antigen. In addition to its role in DNA replication and damage repair, Poldip2 has been implicated in mitochondrial function, extracellular matrix regulation, cell cycle progression, focal adhesion turnover, and cell migration. However, Poldip2 functions are incompletely understood. In this review, we discuss recent literature on Poldip2 tissue distribution, subcellular localization, and function. We also address the putative function of Poldip2 in cardiovascular disease, neurodegenerative conditions and in renal pathophysiology.
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11
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Gajos-Draus A, Duda M, Beręsewicz A. Cardiac and renal upregulation of Nox2 and NF- κB and repression of Nox4 and Nrf2 in season- and diabetes-mediated models of vascular oxidative stress in guinea-pig and rat. Physiol Rep 2017; 5:e13474. [PMID: 29084841 PMCID: PMC5661235 DOI: 10.14814/phy2.13474] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2017] [Revised: 09/11/2017] [Accepted: 09/19/2017] [Indexed: 12/31/2022] Open
Abstract
The superoxide-forming NADPH oxidase homologues, Nox1, Nox2, and Nox5, seem to mediate the pro-atherosclerotic vascular phenotype. The hydrogen peroxide-forming Nox4 afforded vascular protection, likely via NF-E2-related factor-2 (Nrf2) activation and/or Nox2 downregulation in transgenic mice. We hypothesized that oxidative stress in the intact vasculature involves, aside from the upregulation of the superoxide-forming Noxs, the downregulation of the Nox4/Nrf2 pathway. Guinea-pigs and rats were studied either in winter or in summer, and the streptozotocin diabetic rats in winter. Plasma nitrite, and superoxide production by isolated hearts were measured, while frozen tissues served in biochemical analyses. Summer in both species and diabetes in rats downregulated myocardial Nox4 while reciprocally upregulating Nox2 and Nox5 in guinea-pigs, and Nox2 in rats. Simultaneously, myocardial Nrf2 activity and the expression of the Nrf2-directed heme oxygenase-1 and endothelial NO synthase were reduced while activity of the nuclear factor κB (NF-κB) and the expression of NF-κB-directed inducible NO synthase and the vascular cell adhesion molecule-1 were increased. Cardiac superoxide production was increased while plasma nitrite was decreased reciprocally. Analogous disregulation of Noxs, Nrf2, and NF-κB, occurred in diabetic rat kidneys. Given the diversity of the experimental settings and the uniform pattern of the responses, we speculate that: (1) chronic vascular oxidative stress is a nonspecific (model-, species-, organ-independent) response involving the induction of Nox2 (and Nox5 in guinea-pigs) and the NF-κB pathway, and the repression of Nox4 and the Nrf2 pathway; and (2) the systems Nox2-NF-κB and Nox4-Nrf2 regulate each other negatively.
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Affiliation(s)
- Anna Gajos-Draus
- Department of Clinical Physiology, Postgraduate Medical School, Warsaw, Poland
| | - Monika Duda
- Department of Clinical Physiology, Postgraduate Medical School, Warsaw, Poland
| | - Andrzej Beręsewicz
- Department of Clinical Physiology, Postgraduate Medical School, Warsaw, Poland
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12
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Potential role of microRNA-10b down-regulation in cardiomyocyte apoptosis in aortic stenosis patients. Clin Sci (Lond) 2016; 130:2139-2149. [DOI: 10.1042/cs20160462] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 09/12/2016] [Indexed: 11/17/2022]
Abstract
Myocardial miR-10b down-regulation may be involved in the increase in cardiomyocyte apoptosis in AS patients, probably through apoptosis protease-activating factor-1 (Apaf-1) regulation. In turn, increased cardiomyocyte apoptosis contributes to cardiomyocyte damage and heart failure (HF) development.
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13
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Gray SP, Di Marco E, Kennedy K, Chew P, Okabe J, El-Osta A, Calkin AC, Biessen EA, Touyz RM, Cooper ME, Schmidt HH, Jandeleit-Dahm KA. Reactive Oxygen Species Can Provide Atheroprotection via NOX4-Dependent Inhibition of Inflammation and Vascular Remodeling. Arterioscler Thromb Vasc Biol 2016; 36:295-307. [DOI: 10.1161/atvbaha.115.307012] [Citation(s) in RCA: 123] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Accepted: 12/18/2015] [Indexed: 02/07/2023]
Abstract
Objective—
Oxidative stress is considered a hallmark of atherosclerosis. In particular, the superoxide-generating type 1 NADPH oxidase (NOX1) has been shown to be induced and play a pivotal role in early phases of mouse models of atherosclerosis and in the context of diabetes mellitus. Here, we investigated the role of the most abundant type 4 isoform (NOX4) in human and mouse advanced atherosclerosis.
Approach and Results—
Plaques of patients with cardiovascular events or established diabetes mellitus showed a surprising reduction in expression of the most abundant but hydrogen peroxide (H
2
O
2
)-generating type 4 isoform (Nox4), whereas Nox1 mRNA was elevated, when compared with respective controls. As these data suggested that NOX4-derived reactive oxygen species may convey a surprisingly protective effect during plaque progression, we examined a mouse model of accelerated and advanced diabetic atherosclerosis, the streptozotocin-treated
ApoE
−/−
mouse, with (
NOX4
−/−
) and without genetic deletion of Nox4. Similar to the human data, advanced versus early plaques of wild-type mice showed reduced Nox4 mRNA expression. Consistent with a rather protective role of NOX4-derived reactive oxygen species,
NOX4
−/−
mice showed increased atherosclerosis when compared with wild-type mice. Deleting NOX4 was associated with reduced H
2
O
2
forming activity and attenuation of the proinflammatory markers, monocyte chemotratic protein-1, interleukin-1β, and tumor necrosis factor-α, as well as vascular macrophage accumulation. Furthermore, there was a greater accumulation of fibrillar collagen fibres within the vascular wall and plaque in diabetic
Nox4
−/−
ApoE
−/−
mice, indicative of plaque remodeling. These data could be replicated in human aortic endothelial cells in vitro, where Nox4 overexpression increased H
2
O
2
and reduced the expression of pro-oxidants and profibrotic markers. Interestingly, Nox4 levels inversely correlated with Nox2 gene and protein levels. Although NOX2 is not constitutively active unlike NOX4 and forms rather superoxide, this opens up the possibility that at least some effects of NOX4 deletion are mediated by NOX2 activation.
Conclusions—
Thus, the appearance of reactive oxygen species in atherosclerosis is apparently not always a nondesirable oxidative stress, but can also have protective effects. Both in humans and in mouse, the H
2
O
2
-forming NOX4, unlike the superoxide-forming NOX1, can act as a negative modulator of inflammation and remodeling and convey atheroprotection. These results have implications on how to judge reactive oxygen species formation in cardiovascular disease and need to be considered in the development of NOX inhibitory drugs.
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Affiliation(s)
- Stephen P. Gray
- From the Diabetic Complications Laboratory (S.P.G., E.D.M., K.K., P.C., M.E.C., K.A.M.J.-D.), Epigenetics Laboratory (J.O., A.E.-O.), and Diabetes and Dyslipidaemia Group (A.C.C.), Baker IDI Heart and Diabetes Institute, Melbourne, Australia; Faculty of Medicine, Monash University, Melbourne, Australia (S.P.G., E.D.M., K.A.M.J.-D.); Department of Pathology, Maastricht University Medical Center, Maastricht, The Netherlands (E.A.L.B.); Institute of Cardiovascular and Medical Sciences, University of
| | - Elyse Di Marco
- From the Diabetic Complications Laboratory (S.P.G., E.D.M., K.K., P.C., M.E.C., K.A.M.J.-D.), Epigenetics Laboratory (J.O., A.E.-O.), and Diabetes and Dyslipidaemia Group (A.C.C.), Baker IDI Heart and Diabetes Institute, Melbourne, Australia; Faculty of Medicine, Monash University, Melbourne, Australia (S.P.G., E.D.M., K.A.M.J.-D.); Department of Pathology, Maastricht University Medical Center, Maastricht, The Netherlands (E.A.L.B.); Institute of Cardiovascular and Medical Sciences, University of
| | - Kit Kennedy
- From the Diabetic Complications Laboratory (S.P.G., E.D.M., K.K., P.C., M.E.C., K.A.M.J.-D.), Epigenetics Laboratory (J.O., A.E.-O.), and Diabetes and Dyslipidaemia Group (A.C.C.), Baker IDI Heart and Diabetes Institute, Melbourne, Australia; Faculty of Medicine, Monash University, Melbourne, Australia (S.P.G., E.D.M., K.A.M.J.-D.); Department of Pathology, Maastricht University Medical Center, Maastricht, The Netherlands (E.A.L.B.); Institute of Cardiovascular and Medical Sciences, University of
| | - Phyllis Chew
- From the Diabetic Complications Laboratory (S.P.G., E.D.M., K.K., P.C., M.E.C., K.A.M.J.-D.), Epigenetics Laboratory (J.O., A.E.-O.), and Diabetes and Dyslipidaemia Group (A.C.C.), Baker IDI Heart and Diabetes Institute, Melbourne, Australia; Faculty of Medicine, Monash University, Melbourne, Australia (S.P.G., E.D.M., K.A.M.J.-D.); Department of Pathology, Maastricht University Medical Center, Maastricht, The Netherlands (E.A.L.B.); Institute of Cardiovascular and Medical Sciences, University of
| | - Jun Okabe
- From the Diabetic Complications Laboratory (S.P.G., E.D.M., K.K., P.C., M.E.C., K.A.M.J.-D.), Epigenetics Laboratory (J.O., A.E.-O.), and Diabetes and Dyslipidaemia Group (A.C.C.), Baker IDI Heart and Diabetes Institute, Melbourne, Australia; Faculty of Medicine, Monash University, Melbourne, Australia (S.P.G., E.D.M., K.A.M.J.-D.); Department of Pathology, Maastricht University Medical Center, Maastricht, The Netherlands (E.A.L.B.); Institute of Cardiovascular and Medical Sciences, University of
| | - Assam El-Osta
- From the Diabetic Complications Laboratory (S.P.G., E.D.M., K.K., P.C., M.E.C., K.A.M.J.-D.), Epigenetics Laboratory (J.O., A.E.-O.), and Diabetes and Dyslipidaemia Group (A.C.C.), Baker IDI Heart and Diabetes Institute, Melbourne, Australia; Faculty of Medicine, Monash University, Melbourne, Australia (S.P.G., E.D.M., K.A.M.J.-D.); Department of Pathology, Maastricht University Medical Center, Maastricht, The Netherlands (E.A.L.B.); Institute of Cardiovascular and Medical Sciences, University of
| | - Anna C. Calkin
- From the Diabetic Complications Laboratory (S.P.G., E.D.M., K.K., P.C., M.E.C., K.A.M.J.-D.), Epigenetics Laboratory (J.O., A.E.-O.), and Diabetes and Dyslipidaemia Group (A.C.C.), Baker IDI Heart and Diabetes Institute, Melbourne, Australia; Faculty of Medicine, Monash University, Melbourne, Australia (S.P.G., E.D.M., K.A.M.J.-D.); Department of Pathology, Maastricht University Medical Center, Maastricht, The Netherlands (E.A.L.B.); Institute of Cardiovascular and Medical Sciences, University of
| | - Erik A.L. Biessen
- From the Diabetic Complications Laboratory (S.P.G., E.D.M., K.K., P.C., M.E.C., K.A.M.J.-D.), Epigenetics Laboratory (J.O., A.E.-O.), and Diabetes and Dyslipidaemia Group (A.C.C.), Baker IDI Heart and Diabetes Institute, Melbourne, Australia; Faculty of Medicine, Monash University, Melbourne, Australia (S.P.G., E.D.M., K.A.M.J.-D.); Department of Pathology, Maastricht University Medical Center, Maastricht, The Netherlands (E.A.L.B.); Institute of Cardiovascular and Medical Sciences, University of
| | - Rhian M. Touyz
- From the Diabetic Complications Laboratory (S.P.G., E.D.M., K.K., P.C., M.E.C., K.A.M.J.-D.), Epigenetics Laboratory (J.O., A.E.-O.), and Diabetes and Dyslipidaemia Group (A.C.C.), Baker IDI Heart and Diabetes Institute, Melbourne, Australia; Faculty of Medicine, Monash University, Melbourne, Australia (S.P.G., E.D.M., K.A.M.J.-D.); Department of Pathology, Maastricht University Medical Center, Maastricht, The Netherlands (E.A.L.B.); Institute of Cardiovascular and Medical Sciences, University of
| | - Mark E. Cooper
- From the Diabetic Complications Laboratory (S.P.G., E.D.M., K.K., P.C., M.E.C., K.A.M.J.-D.), Epigenetics Laboratory (J.O., A.E.-O.), and Diabetes and Dyslipidaemia Group (A.C.C.), Baker IDI Heart and Diabetes Institute, Melbourne, Australia; Faculty of Medicine, Monash University, Melbourne, Australia (S.P.G., E.D.M., K.A.M.J.-D.); Department of Pathology, Maastricht University Medical Center, Maastricht, The Netherlands (E.A.L.B.); Institute of Cardiovascular and Medical Sciences, University of
| | - Harald H.H.W. Schmidt
- From the Diabetic Complications Laboratory (S.P.G., E.D.M., K.K., P.C., M.E.C., K.A.M.J.-D.), Epigenetics Laboratory (J.O., A.E.-O.), and Diabetes and Dyslipidaemia Group (A.C.C.), Baker IDI Heart and Diabetes Institute, Melbourne, Australia; Faculty of Medicine, Monash University, Melbourne, Australia (S.P.G., E.D.M., K.A.M.J.-D.); Department of Pathology, Maastricht University Medical Center, Maastricht, The Netherlands (E.A.L.B.); Institute of Cardiovascular and Medical Sciences, University of
| | - Karin A.M. Jandeleit-Dahm
- From the Diabetic Complications Laboratory (S.P.G., E.D.M., K.K., P.C., M.E.C., K.A.M.J.-D.), Epigenetics Laboratory (J.O., A.E.-O.), and Diabetes and Dyslipidaemia Group (A.C.C.), Baker IDI Heart and Diabetes Institute, Melbourne, Australia; Faculty of Medicine, Monash University, Melbourne, Australia (S.P.G., E.D.M., K.A.M.J.-D.); Department of Pathology, Maastricht University Medical Center, Maastricht, The Netherlands (E.A.L.B.); Institute of Cardiovascular and Medical Sciences, University of
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