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Leung PYM, Katerelos M, Choy S, Cook N, Lee M, Paizis K, Abboud A, Manning JA, Mount PF, Power DA. Expression of NEDD4L and ENaC in Urinary Extracellular Vesicles in Pre-eclampsia. Hypertens Pregnancy 2023; 42:2232029. [PMID: 37417251 DOI: 10.1080/10641955.2023.2232029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 07/08/2023]
Abstract
OBJECTIVE To assess changes in expression of renal epithelial sodium channel (ENaC) and NEDD4L, a ubiquitin ligase, in urinary extracellular vesicles (UEV) of pre-eclamptic women compared to normal pregnant controls. METHODS Urine was collected from pre-eclamptic women (PE, n = 20) or during normal pregnancy (NP, n = 20). UEV were separated by differential ultracentrifugation. NEDD4L, α-ENaC and γ-ENaC were identified by immunoblotting. RESULTS There was no difference in the expression of NEDD4L (p = 0.17) and α-ENaC (p = 0.10). PE subjects showed increased expression of γ-ENaC by 6.9-fold compared to NP (p < 0.0001). CONCLUSION ENaC expression is upregulated in UEV of pre-eclamptic subjects but was not associated with changes in NEDD4L.
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Affiliation(s)
- P Y M Leung
- Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Parkville, Australia
- Department of Nephrology, Austin Health, Heidelberg, Australia
- Kidney Laboratory, Institute for Breathing and Sleep, Heidelberg, Australia
| | - M Katerelos
- Department of Nephrology, Austin Health, Heidelberg, Australia
- Kidney Laboratory, Institute for Breathing and Sleep, Heidelberg, Australia
| | - S Choy
- Department of Nephrology, Austin Health, Heidelberg, Australia
| | - N Cook
- Department of Nephrology, Austin Health, Heidelberg, Australia
| | - M Lee
- Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Parkville, Australia
- Department of Nephrology, Austin Health, Heidelberg, Australia
- Kidney Laboratory, Institute for Breathing and Sleep, Heidelberg, Australia
| | - K Paizis
- Department of Nephrology, Austin Health, Heidelberg, Australia
| | - A Abboud
- Department of Obstetrics & Gynaecology, Mercy Hospital for Women, Heidelberg, Australia
| | - J A Manning
- Centre for Cancer Biology, University of South Australia and SA Pathology, Adelaide, Australia
| | - P F Mount
- Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Parkville, Australia
- Department of Nephrology, Austin Health, Heidelberg, Australia
- Kidney Laboratory, Institute for Breathing and Sleep, Heidelberg, Australia
| | - D A Power
- Faculty of Medicine, Dentistry and Health Sciences, University of Melbourne, Parkville, Australia
- Department of Nephrology, Austin Health, Heidelberg, Australia
- Kidney Laboratory, Institute for Breathing and Sleep, Heidelberg, Australia
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Choy S, Paolino A, Kim B, Lim S, Seo J, Tan S, Tan W, Corbett M, Barker J, Lynch M, Smith C, Mahil S. 100 Deep learning image analyses in dermatology, beyond skin lesions: a systematic review. J Invest Dermatol 2022. [DOI: 10.1016/j.jid.2022.09.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Shum G, Cinnamond S, Hutton M, Chan D, Chauhan R, Bloxham S, Choy S, Cheung R, Eldabe S, Clarke A. Decreased tibial nerve movement in patients with failed back surgery syndrome and persistent leg pain. Eur Spine J 2019; 28:2122-2128. [DOI: 10.1007/s00586-019-06056-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 06/11/2019] [Accepted: 06/27/2019] [Indexed: 02/28/2024]
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Choy S, Kjellsson MC, Karlsson MO, de Winter W. Weight-HbA1c-insulin-glucose model for describing disease progression of type 2 diabetes. CPT Pharmacometrics Syst Pharmacol 2015; 5:11-9. [PMID: 26844011 PMCID: PMC4728293 DOI: 10.1002/psp4.12051] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2015] [Accepted: 11/16/2015] [Indexed: 12/04/2022]
Abstract
A previous semi‐mechanistic model described changes in fasting serum insulin (FSI), fasting plasma glucose (FPG), and glycated hemoglobin (HbA1c) in patients with type 2 diabetic mellitus (T2DM) by modeling insulin sensitivity and β‐cell function. It was later suggested that change in body weight could affect insulin sensitivity, which this study evaluated in a population model to describe the disease progression of T2DM. Nonlinear mixed effects modeling was performed on data from 181 obese patients with newly diagnosed T2DM managed with diet and exercise for 67 weeks. Baseline β‐cell function and insulin sensitivity were 61% and 25% of normal, respectively. Management with diet and exercise (mean change in body weight = −4.1 kg) was associated with an increase of insulin sensitivity (30.1%) at the end of the study. Changes in insulin sensitivity were associated with a decrease of FPG (range, 7.8–7.3 mmol/L) and HbA1c (6.7–6.4%). Weight change as an effector on insulin sensitivity was successfully evaluated in a semi‐mechanistic population model.
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Affiliation(s)
- S Choy
- Department of Pharmaceutical Biosciences Uppsala University Uppsala Sweden
| | - M C Kjellsson
- Department of Pharmaceutical Biosciences Uppsala University Uppsala Sweden
| | - M O Karlsson
- Department of Pharmaceutical Biosciences Uppsala University Uppsala Sweden
| | - W de Winter
- Janssen Prevention Center Janssen Pharmaceutical Companies of Johnson & Johnson Leiden The Netherlands
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Genet M, Rausch MK, Lee LC, Choy S, Zhao X, Kassab GS, Kozerke S, Guccione JM, Kuhl E. Heterogeneous growth-induced prestrain in the heart. J Biomech 2015; 48:2080-9. [PMID: 25913241 DOI: 10.1016/j.jbiomech.2015.03.012] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2014] [Revised: 01/09/2015] [Accepted: 03/10/2015] [Indexed: 12/01/2022]
Abstract
Even when entirely unloaded, biological structures are not stress-free, as shown by Y.C. Fung׳s seminal opening angle experiment on arteries and the left ventricle. As a result of this prestrain, subject-specific geometries extracted from medical imaging do not represent an unloaded reference configuration necessary for mechanical analysis, even if the structure is externally unloaded. Here we propose a new computational method to create physiological residual stress fields in subject-specific left ventricular geometries using the continuum theory of fictitious configurations combined with a fixed-point iteration. We also reproduced the opening angle experiment on four swine models, to characterize the range of normal opening angle values. The proposed method generates residual stress fields which can reliably reproduce the range of opening angles between 8.7±1.8 and 16.6±13.7 as measured experimentally. We demonstrate that including the effects of prestrain reduces the left ventricular stiffness by up to 40%, thus facilitating the ventricular filling, which has a significant impact on cardiac function. This method can improve the fidelity of subject-specific models to improve our understanding of cardiac diseases and to optimize treatment options.
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Affiliation(s)
- M Genet
- Department of Surgery, School of Medicine, University of California at San Francisco, USA; Institute for Biomedical Engineering, University and ETH Zürich, Switzerland.
| | - M K Rausch
- Department of Mechanical Engineering, Stanford University, CA, USA
| | - L C Lee
- Department of Surgery, School of Medicine, University of California at San Francisco, USA; Department of Mechanical Engineering, Michigan State University, MI, USA
| | - S Choy
- Department of Biomedical Engineering, Indiana University-Purdue University Indianapolis, USA
| | - X Zhao
- Department of Biomedical Engineering, Indiana University-Purdue University Indianapolis, USA
| | - G S Kassab
- Department of Mechanical Engineering, Michigan State University, MI, USA; Department of Cellular and Integrative Physiology, Indiana University-Purdue University Indianapolis, USA; Department of Surgery, Indiana University-Purdue University Indianapolis, USA
| | - S Kozerke
- Institute for Biomedical Engineering, University and ETH Zürich, Switzerland
| | - J M Guccione
- Department of Surgery, School of Medicine, University of California at San Francisco, USA
| | - E Kuhl
- Department of Mechanical Engineering, Stanford University, CA, USA; Department of Bioengineering, Stanford University, CA, USA; Department of Cardiothoracic Surgery, Stanford University, CA, USA
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Abstract
INTRODUCTION The incidence of age-related bone fracture is increasing with average population age. Bone scatters more light (stress-whitens) during loading, immediately prior to failure, in a manner visually similar to polymer crazing. We wish to understand the stress-whitening process because of its possible effect on bone toughness. The goals of this investigation were a) to establish that stress-whitening is a property of the demineralized organic matrix of bone rather than only a property of mineralized tissue and that stress whitening within the demineralized bone is dependent upon both b) hydrogen bonding and, c) the orientation of loading. METHODS Demineralized cortical bone specimens were loaded in tension to failure (0.08 strain/s). The effect of hydrogen bonding on mechanical properties and the stress-whitening process was probed by altering the Hansen's hydrogen bonding parameter (δh) of the immersing solution. RESULTS Stress-whitening occurred in the demineralized bone. Stress-whitening was negatively correlated with δh (R(2)=0.81, p<0.0001). Stress-whitening was significantly lower (p<0.0001) in specimens loaded orthogonally compared to those loaded parallel to the long (strong) axis. CONCLUSION The stress-whitening observed was consistent with increased Mie scattering. We suggest that the change in Mie scattering was due to collagen fibril dehydration driven by the externally applied stress. The presence of stress-whitening in demineralized bone suggests that this process may be a property of the collagenous matrix and hence may be present in other collagenous tissues rather than an emergent property of the bone composite.
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Affiliation(s)
- M R Hardisty
- Lawrence J Ellison Musculoskeletal Research Laboratory, Department of Orthopaedic Surgery, UC Davis School of Medicine, UC Davis, Sacramento, CA, USA; Biomedical Engineering Graduate Group, UC Davis, Davis, CA, USA
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Cook BD, Abrams KM, Marshall J, Perna CN, Choy S, Guzik MT, Cooper SJB. Species diversity and genetic differentiation of stygofauna (Syncarida:Bathynellacea) across an alluvial aquifer in north-eastern Australia. AUST J ZOOL 2012. [DOI: 10.1071/zo12061] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Recent research suggests that alluvial aquifers in southern and eastern Australia may contain a diverse subterranean aquatic fauna (i.e. stygofauna). However, to date only a limited number of alluvial aquifers have been studied and little molecular data are available to assess species-level diversity and spatial patterns of genetic variation within stygofaunal species. In this paper, we present the initial results of a stygofaunal survey of the Burdekin River alluvial aquifer in Queensland, extending the northern range of alluvial aquifers along the east coast of Australia that have been investigated. The survey resulted in the collection of bathynellid stygofauna (Syncarida: Bathynellacea) and genetic analyses were conducted to determine species level diversity using the mitochondrial cytochrome oxidase subunit I (COI) gene. We further investigated the phylogenetic relationships of the species with bathynellids from western and southern Australia to assess the generic status of species. Four highly divergent COI lineages within the Parabathynellidae and one lineage within the Bathynellidae were found. These lineages did not group within any described genera, and phylogenetic analyses indicated that both local radiations and the retention of a lineage that was more apical in the genealogy account for the diversity within the Parabathynellidae in the Burdekin River alluvial aquifer. Most COI lineages were sampled from only a single bore, although one taxon within the Parabathynellidae was found to be more widespread in the aquifer. Haplotypes within this taxon were not shared among bores (ΦST = 0.603, P < 0.001). Overall, the high species diversity for bathynellaceans from an alluvial aquifer reported here, and surveys of bathynellaceans in several other alluvial systems in south-eastern Australia, suggests that groundwater ecosystems of eastern Australia may contain high stygofaunal diversity by Australian and world standards, particularly at the generic level for parabathynellids.
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Ogden RT, Choy S, Mann J, Parsey R. Simultaneous estimation of input functions: An empirical study. Neuroimage 2008. [DOI: 10.1016/j.neuroimage.2008.04.048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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Rai R, Tuddenham E, Backos M, Jivraj S, El'Gaddal S, Choy S, Cork B, Regan L. Thromboelastography, whole-blood haemostasis and recurrent miscarriage. Hum Reprod 2003; 18:2540-3. [PMID: 14645169 DOI: 10.1093/humrep/deg494] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND Some cases of recurrent miscarriage have a thrombotic basis. Thromboelastography is a rapid, reproducible test of whole-blood haemostasis. METHODS Thromboelastography was performed in 494 consecutive, non-pregnant women (median age 35 years; range 21-48) with a history of miscarriages at <12 weeks gestation (median 4; range 3-12) and 55 parous women (median age 33 years; range 20-41) with no history of pregnancy loss. The prospective outcome of untreated pregnancies amongst 108 women with recurrent miscarriage was studied. RESULTS The maximum clot amplitude (MA) (median 66.0 mm; range 48.0-76.0) was significantly higher and the rate of clot lysis (LY30) (median 2.5%; range 0.5-7.8) significantly lower amongst women with recurrent miscarriage compared with controls (MA 61.5 mm; range 50.0-67.0; P = 0.01; LY30 4.9%; range 2.9-9.7; P = 0.01). The pre-pregnancy MA was significantly higher amongst women who subsequently miscarried (median 66.0 mm; range 54.0-73.0) compared with those whose had a live birth (median 61.7 mm; 48.0-71.5; P < 0.01). A pre-pregnancy MA >or=64 mm has a sensitivity of 68% and specificity of 82% to predict miscarriage. CONCLUSIONS Thromboelastography identifies a subgroup of women with recurrent miscarriage to be in a prothrombotic state outside of pregnancy. Women in such a state are at increased risk of miscarriage in future untreated pregnancies.
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Affiliation(s)
- R Rai
- Faculty of Medicine, Department of Obstetrics and Gynaecology, Imperial College London, St Mary's Hospital, Mint Wing, South Wharf Road, London W2 1PG, UK.
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Hoang H, Recknagel F, Marshall J, Choy S. Elucidation of Hypothetical Relationships between Habitat Conditions and Macroinvertebrate Assemblages in Freshwater Streams by Artificial Neural Networks. ECOL INFORM 2003. [DOI: 10.1007/978-3-662-05150-4_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Liu SY, Lu X, Choy S, Dembinski TC, Hatch GM, Mymin D, Shen X, Angel A, Choy PC, Man RY. Alteration of lysophosphatidylcholine content in low density lipoprotein after oxidative modification: relationship to endothelium dependent relaxation. Cardiovasc Res 1994; 28:1476-81. [PMID: 8001034 DOI: 10.1093/cvr/28.10.1476] [Citation(s) in RCA: 53] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
OBJECTIVE The aim was to examine the formation of lipid peroxidation products and the alteration in phospholipid content in low density lipoprotein (LDL) after oxidative modification by CuSO4, and subsequently, to determine the ability of the modified LDL to impair endothelium dependent relaxation in rat aortic rings. METHODS Blood samples were obtained from normal human volunteers. LDL was prepared by sequential ultracentrifugation and it was oxidatively modified in the presence of 5 microM CuSO4. Lipid peroxidation products (thiobarbituric acid reactive substances, TBARS), and alterations in electrophoretic mobility and phospholipid content were determined in normal (native) and oxidised LDL. Endothelium dependent relaxation was produced by acetylcholine (10(-8)-10(-5) M) in phenylephrine precontracted rat aortic rings. RESULTS LDL incubated for 24 h with 5 microM CuSO4 at 20 degrees C and 37 degrees C with constant agitation displayed higher amounts of TBARS than the respective native LDL. While the amounts of TBARS in LDL modified at 20 degrees C and 37 degrees C were similar, the former condition resulted in statistically smaller changes of phospholipid contents. LDL with higher lysophosphatidylcholine content showed greater impairment of endothelium dependent relaxation in rat aortic rings than LDL with lower lysophosphatidylcholine content. CONCLUSIONS The raised lysophosphatidylcholine level in oxidatively modified LDL was related to the ability of the LDL to impair endothelium dependent relaxation. However, lipid peroxidation products assessed by TBARS did not relate to the phospholipid changes in LDL and therefore cannot be used to predict the vascular effects of LDL after oxidative modification.
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Affiliation(s)
- S Y Liu
- Lipid Research Group, Faculty of Medicine, University of Manitoba, Winnipeg, Canada
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Morgan JP, Miyabayashi T, Choy S. Cervical spine motion: radiographic study. Am J Vet Res 1986; 47:2165-9. [PMID: 3777640] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Knowledge of the acceptable range of motion of the cervical spine of the dog is used in the radiographic diagnosis of both developmental and degenerative diseases. A series of radiographs of mature Beagle dogs was used to identify motion within sagittal and transverse planes. Positioning of the dog's head and neck was standardized, using a restraining board, and mimicked those thought to be of value in diagnostic radiology. The range of motion was greatest between C2 and C5. Reports of severe disk degeneration in the cervical spine of the Beagle describe the most severely involved disks to be C4 through C7. Thus, a high range of motion between vertebral segments does not seem to be the cause for the severe degenerative disk disease. Dorsoventral slippage between vertebral segments was seen, but was not accurately measured. Wedging of disks was clearly identified. At the atlantoaxio-occipital region, there was a high degree of motion within the sagittal plane at the atlantoaxial and atlanto-occipital joints; the measurement can be a guideline in the radiographic diagnosis of instability due to developmental anomalies in this region. Lateral motion within the transverse plane was detected at the 2 joints; however, motion was minimal, and the measurements seemed to be less accurate because of rotation of the cervical spine. Height of the vertebral canal was consistently noted to be greater at the caudal orifice, giving some warning to the possibility of overdiagnosis in suspected instances of cervical spondylopathy.(ABSTRACT TRUNCATED AT 250 WORDS)
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