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Shrimpton AJ, Quayle AC, Sleep DL, Brown JM, Cook TM. Quantification of aerosol generation during positive pressure ventilation via a supraglottic airway with an intentional leak. Anaesthesia 2024; 79:318-320. [PMID: 38217363 DOI: 10.1111/anae.16197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/20/2023] [Indexed: 01/15/2024]
Affiliation(s)
| | - A C Quayle
- Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
| | - D L Sleep
- Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
| | - J M Brown
- North Bristol NHS Trust, Bristol, UK
| | - T M Cook
- Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
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2
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Wang M, Brandt LTL, Wang X, Russell H, Mitchell E, Kamimae-Lanning AN, Brown JM, Dingler FA, Garaycoechea JI, Isobe T, Kinston SJ, Gu M, Vassiliou GS, Wilson NK, Göttgens B, Patel KJ. Genotoxic aldehyde stress prematurely ages hematopoietic stem cells in a p53-driven manner. Mol Cell 2023; 83:2417-2433.e7. [PMID: 37348497 PMCID: PMC7614878 DOI: 10.1016/j.molcel.2023.05.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2022] [Revised: 04/18/2023] [Accepted: 05/25/2023] [Indexed: 06/24/2023]
Abstract
Aged hematopoietic stem cells (HSCs) display diminished self-renewal and a myeloid differentiation bias. However, the drivers and mechanisms that underpin this fundamental switch are not understood. HSCs produce genotoxic formaldehyde that requires protection by the detoxification enzymes ALDH2 and ADH5 and the Fanconi anemia (FA) DNA repair pathway. We find that the HSCs in young Aldh2-/-Fancd2-/- mice harbor a transcriptomic signature equivalent to aged wild-type HSCs, along with increased epigenetic age, telomere attrition, and myeloid-biased differentiation quantified by single HSC transplantation. In addition, the p53 response is vigorously activated in Aldh2-/-Fancd2-/- HSCs, while p53 deletion rescued this aged HSC phenotype. To further define the origins of the myeloid differentiation bias, we use a GFP genetic reporter to find a striking enrichment of Vwf+ myeloid and megakaryocyte-lineage-biased HSCs. These results indicate that metabolism-derived formaldehyde-DNA damage stimulates the p53 response in HSCs to drive accelerated aging.
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Affiliation(s)
- Meng Wang
- Division of Nutritional Sciences, Cornell University, Ithaca, NY, USA; Wellcome-MRC Cambridge Stem Cell Institute, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, UK; MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, UK.
| | - Laura T L Brandt
- MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, UK
| | - Xiaonan Wang
- Wellcome-MRC Cambridge Stem Cell Institute, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, UK; School of Public Health, Shanghai Jiaotong University School of Medicine, Shanghai, China
| | - Holly Russell
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, UK
| | - Emily Mitchell
- Wellcome-MRC Cambridge Stem Cell Institute, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, UK; Wellcome Sanger Institute, Hinxton, UK
| | - Ashley N Kamimae-Lanning
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, UK
| | - Jill M Brown
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, UK
| | - Felix A Dingler
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, UK
| | - Juan I Garaycoechea
- Hubrecht Institute-KNAW (Royal Netherlands Academy of Arts and Sciences) and University Medical Center, Utrecht, the Netherlands
| | - Tomoya Isobe
- Wellcome-MRC Cambridge Stem Cell Institute, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, UK
| | - Sarah J Kinston
- Wellcome-MRC Cambridge Stem Cell Institute, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, UK
| | - Muxin Gu
- Wellcome-MRC Cambridge Stem Cell Institute, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, UK
| | - George S Vassiliou
- Wellcome-MRC Cambridge Stem Cell Institute, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, UK
| | - Nicola K Wilson
- Wellcome-MRC Cambridge Stem Cell Institute, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, UK
| | - Berthold Göttgens
- Wellcome-MRC Cambridge Stem Cell Institute, Jeffrey Cheah Biomedical Centre, University of Cambridge, Cambridge, UK
| | - Ketan J Patel
- MRC Weatherall Institute of Molecular Medicine, University of Oxford, John Radcliffe Hospital, Oxford, UK.
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Brown JM, Steffensen A, Trump B. Clinical features and overall survival of osteosarcoma of the mandible. Int J Oral Maxillofac Surg 2023; 52:524-530. [PMID: 36243646 DOI: 10.1016/j.ijom.2022.10.005] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 09/08/2022] [Accepted: 10/06/2022] [Indexed: 04/09/2023]
Abstract
Osteosarcoma is the most common bone sarcoma and is typically found in the distal femur, proximal tibia, and proximal humerus. While several factors are known to influence survival, less is known regarding the influence of primary tumor location. This study describes the clinical features and prognosis of mandibular osteosarcoma. The SEER database was utilized to identify cases of mandibular osteosarcoma diagnosed between 2004 and 2015. Sex, age, grade, histological subtype, tumor size, tumor extension, presence of metastasis at diagnosis, and therapeutic intervention were determined. Osteosarcomas originating from other sites were assessed for comparison. There were 164 cases of mandibular osteosarcoma identified, representing 5.5% of all surveyed osteosarcomas. The 2-, 5-, and 10-year overall survival rates were 79.9%, 65.6% and 58.5%, respectively. Survival was worse for patients with older age, larger tumor size, metastatic disease, and absence of surgical resection. Compared to other sites, mandibular osteosarcomas were significantly smaller tumors and were far less likely to metastasize. Mandibular osteosarcoma manifested at an older age than the more common extremity osteosarcomas and presented with smaller tumors. Rates of metastasis of jaw osteosarcoma were much lower than osteosarcoma found in the extremities, while mortality rates were comparable.
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Affiliation(s)
- J M Brown
- Department of Orthopaedics, Huntsman Cancer Institute, Salt Lake City, Utah, USA.
| | - A Steffensen
- University of Utah School of Dentistry, Salt Lake City, Utah, USA
| | - B Trump
- University of Utah School of Dentistry, Salt Lake City, Utah, USA
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Shrimpton AJ, O'Farrell G, Howes HM, Craven R, Duffen AR, Cook TM, Reid JP, Brown JM, Pickering AE. A quantitative evaluation of aerosol generation during awake tracheal intubation. Anaesthesia 2023; 78:587-597. [PMID: 36710390 DOI: 10.1111/anae.15968] [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] [Subscribe] [Scholar Register] [Accepted: 12/21/2022] [Indexed: 01/31/2023]
Abstract
Aerosol-generating procedures are medical interventions considered high risk for transmission of airborne pathogens. Tracheal intubation of anaesthetised patients is not high risk for aerosol generation; however, patients often perform respiratory manoeuvres during awake tracheal intubation which may generate aerosol. To assess the risk, we undertook aerosol monitoring during a series of awake tracheal intubations and nasendoscopies in healthy participants. Sampling was undertaken within an ultraclean operating theatre. Procedures were performed and received by 12 anaesthetic trainees. The upper airway was topically anaesthetised with lidocaine and participants were not sedated. An optical particle sizer continuously sampled aerosol. Passage of the bronchoscope through the vocal cords generated similar peak median (IQR [range]) aerosol concentrations to coughing, 1020 (645-1245 [120-48,948]) vs. 1460 (390-2506 [40-12,280]) particles.l-1 respectively, p = 0.266. Coughs evoked when lidocaine was sprayed on the vocal cords generated 91,700 (41,907-166,774 [390-557,817]) particles.l-1 which was significantly greater than volitional coughs (p < 0.001). For 38 nasendoscopies in 12 participants, the aerosol concentrations were relatively low, 180 (120-525 [0-9552]) particles.l-1 , however, five nasendoscopies generated peak aerosol concentrations greater than a volitional cough. Awake tracheal intubation and nasendoscopy can generate high concentrations of respiratory aerosol. Specific risks are associated with lidocaine spray of the larynx, instrumentation of the vocal cords, procedural coughing and deep breaths. Given the proximity of practitioners to patient-generated aerosol, airborne infection control precautions are appropriate when undertaking awake upper airway endoscopy (including awake tracheal intubation, nasendoscopy and bronchoscopy) if respirable pathogens cannot be confidently excluded.
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Affiliation(s)
- A J Shrimpton
- Anaesthesia, Pain and Critical Care Sciences, School of Physiology, Pharmacology and Neuroscience, University of Bristol, UK
| | - G O'Farrell
- Department of Anaesthesia, University Hospitals Bristol and Weston Foundation Trust, Bristol, UK
| | - H M Howes
- Department of Anaesthesia, University Hospitals Bristol and Weston Foundation Trust, Bristol, UK
| | - R Craven
- Department of Anaesthesia, University Hospitals Bristol and Weston Foundation Trust, Bristol, UK
| | - A R Duffen
- Department of Anaesthesia, University Hospitals Bristol and Weston Foundation Trust, Bristol, UK
| | - T M Cook
- Department of Anaesthesia and Intensive Care Medicine, Royal United Hospital NHS Trust, Bath, UK
| | - J P Reid
- School of Chemistry, University of Bristol, UK
| | - J M Brown
- Department of Anaesthesia and Intensive Care Medicine, North Bristol NHS Trust, Bristol, UK
| | - A E Pickering
- Anaesthesia, Pain and Critical Care Sciences, School of Physiology, Pharmacology and Neuroscience, University of Bristol, UK.,Department of Anaesthesia, University Hospitals Bristol and Weston Foundation Trust, Bristol, UK
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5
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Shrimpton AJ, Brown JM, Cook TM, Penfold CM, Reid JP, Pickering AE. Quantitative evaluation of aerosol generation from upper airway suctioning assessed during tracheal intubation and extubation sequences in anaesthetized patients. J Hosp Infect 2022; 124:13-21. [PMID: 35276282 PMCID: PMC9172909 DOI: 10.1016/j.jhin.2022.02.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Revised: 02/17/2022] [Accepted: 02/28/2022] [Indexed: 12/14/2022]
Abstract
BACKGROUND Open respiratory suctioning is defined as an aerosol generating procedure (AGP). Laryngopharyngeal suctioning, used to clear secretions during anaesthesia, is widely managed as an AGP. However, it is uncertain whether upper airway suctioning should be designated as an AGP due to the lack of both aerosol and epidemiological evidence. AIM To assess the relative risk of aerosol generation by upper airway suctioning during tracheal intubation and extubation in anaesthetized patients. METHODS This prospective environmental monitoring study was undertaken in an ultraclean operating theatre setting to assay aerosol concentrations during intubation and extubation sequences, including upper airway suctioning, for patients undergoing surgery (N=19). An optical particle sizer (particle size 0.3-10 μm) sampled aerosol 20 cm above the patient's mouth. Baseline recordings (background, tidal breathing and volitional coughs) were followed by intravenous induction of anaesthesia with neuromuscular blockade. Four periods of laryngopharyngeal suctioning were performed with a Yankauer sucker: pre-laryngoscopy, post-intubation, pre-extubation and post-extubation. FINDINGS Aerosol was reliably detected {median 65 [interquartile range (IQR) 39-259] particles/L} above background [median 4.8 (IQR 1-7) particles/L, P<0.0001] when sampling in close proximity to the patient's mouth during tidal breathing. Upper airway suctioning was associated with a much lower average aerosol concentration than breathing [median 6.0 (IQR 0-12) particles/L, P=0.0007], and was indistinguishable from background (P>0.99). Peak aerosol concentrations recorded during suctioning [median 45 (IQR 30-75) particles/L] were much lower than during volitional coughs [median 1520 (IQR 600-4363) particles/L, P<0.0001] and tidal breathing [median 540 (IQR 300-1826) particles/L, P<0.0001]. CONCLUSION Upper airway suctioning during airway management was not associated with a higher aerosol concentration compared with background, and was associated with a much lower aerosol concentration compared with breathing and coughing. Upper airway suctioning should not be designated as a high-risk AGP.
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Affiliation(s)
- A J Shrimpton
- Anaesthesia, Pain and Critical Care, School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK.
| | - J M Brown
- Department of Anaesthesia and Intensive Care Medicine, North Bristol NHS Trust, Bristol, UK
| | - T M Cook
- Department of Anaesthesia and Intensive Care Medicine, Royal United Hospital NHS Trust, Bath, UK
| | - C M Penfold
- Bristol Biomedical Research Centre, University of Bristol NHS Foundation Trust and University of Bristol, Bristol, UK
| | - J P Reid
- School of Chemistry, University of Bristol, Bristol, UK
| | - A E Pickering
- Anaesthesia, Pain and Critical Care, School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK
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Brown JM, De Ornellas S, Parisi E, Schermelleh L, Buckle VJ. RASER-FISH: non-denaturing fluorescence in situ hybridization for preservation of three-dimensional interphase chromatin structure. Nat Protoc 2022; 17:1306-1331. [PMID: 35379945 DOI: 10.1038/s41596-022-00685-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Accepted: 01/10/2022] [Indexed: 11/09/2022]
Abstract
DNA fluorescence in situ hybridization (FISH) has been a central technique in advancing our understanding of how chromatin is organized within the nucleus. With the increasing resolution offered by super-resolution microscopy, the optimal maintenance of chromatin structure within the nucleus is essential for accuracy in measurements and interpretation of data. However, standard 3D-FISH requires potentially destructive heat denaturation in the presence of chaotropic agents such as formamide to allow access to the DNA strands for labeled FISH probes. To avoid the need to heat-denature, we developed Resolution After Single-strand Exonuclease Resection (RASER)-FISH, which uses exonuclease digestion to generate single-stranded target DNA for efficient probe binding over a 2 d process. Furthermore, RASER-FISH is easily combined with immunostaining of nuclear proteins or the detection of RNAs. Here, we provide detailed procedures for RASER-FISH in mammalian cultured cells to detect single loci, chromatin tracks and topologically associating domains with conventional and super-resolution 3D structured illumination microscopy. Moreover, we provide a validation and characterization of our method, demonstrating excellent preservation of chromatin structure and nuclear integrity, together with improved hybridization efficiency, compared with classic 3D-FISH protocols.
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Affiliation(s)
- Jill M Brown
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, UK
| | - Sara De Ornellas
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, UK
| | - Eva Parisi
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, UK
- School of Clinical Medicine, Addenbrooke's Hospital, Cambridge, UK
| | - Lothar Schermelleh
- Micron Oxford Advanced Bioimaging Unit, Department of Biochemistry, Oxford University, Oxford, UK
| | - Veronica J Buckle
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, UK.
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Shrimpton AJ, Gregson FKA, Brown JM, Cook TM, Bzdek BR, Hamilton F, Reid JP, Pickering AE. A quantitative evaluation of aerosol generation during supraglottic airway insertion and removal. Anaesthesia 2021; 76:1577-1584. [PMID: 34287820 DOI: 10.1111/anae.15542] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/18/2021] [Indexed: 12/30/2022]
Abstract
Many guidelines consider supraglottic airway use to be an aerosol-generating procedure. This status requires increased levels of personal protective equipment, fallow time between cases and results in reduced operating theatre efficiency. Aerosol generation has never been quantitated during supraglottic airway use. To address this evidence gap, we conducted real-time aerosol monitoring (0.3-10-µm diameter) in ultraclean operating theatres during supraglottic airway insertion and removal. This showed very low background particle concentrations (median (IQR [range]) 1.6 (0-3.1 [0-4.0]) particles.l-1 ) against which the patient's tidal breathing produced a higher concentration of aerosol (4.0 (1.3-11.0 [0-44]) particles.l-1 , p = 0.048). The average aerosol concentration detected during supraglottic airway insertion (1.3 (1.0-4.2 [0-6.2]) particles.l-1 , n = 11), and removal (2.1 (0-17.5 [0-26.2]) particles.l-1 , n = 12) was no different to tidal breathing (p = 0.31 and p = 0.84, respectively). Comparison of supraglottic airway insertion and removal with a volitional cough (104 (66-169 [33-326]), n = 27), demonstrated that supraglottic airway insertion/removal sequences produced <4% of the aerosol compared with a single cough (p < 0.001). A transient aerosol increase was recorded during one complicated supraglottic airway insertion (which initially failed to provide a patent airway). Detailed analysis of this event showed an atypical particle size distribution and we subsequently identified multiple sources of non-respiratory aerosols that may be produced during airway management and can be considered as artefacts. These findings demonstrate supraglottic airway insertion/removal generates no more bio-aerosol than breathing and far less than a cough. This should inform the design of infection prevention strategies for anaesthetists and operating theatre staff caring for patients managed with supraglottic airways.
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Affiliation(s)
- A J Shrimpton
- Pain and Critical Care Sciences and School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK
| | - F K A Gregson
- School of Chemistry, University of Bristol, Bristol, UK
| | - J M Brown
- Department of Anaesthesia and Intensive Care Medicine, North Bristol NHS Trust, Bristol, UK
| | - T M Cook
- Department of Anaesthesia and Intensive Care Medicine, Royal United Hospital NHS Trust, Bath, UK
| | - B R Bzdek
- School of Chemistry, University of Bristol, Bristol, UK
| | - F Hamilton
- Population Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
| | - J P Reid
- School of Chemistry, University of Bristol, Bristol, UK
| | - A E Pickering
- Pain and Critical Care Sciences and School of Physiology, Pharmacology and Neuroscience, University of Bristol, Bristol, UK
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Scott C, Downes DJ, Brown JM, Beagrie R, Olijnik AA, Gosden M, Schwessinger R, Fisher CA, Rose A, Ferguson DJP, Johnson E, Hill QA, Okoli S, Renella R, Ryan K, Brand M, Hughes J, Roy NBA, Higgs DR, Babbs C, Buckle VJ. Recapitulation of erythropoiesis in congenital dyserythropoietic anaemia type I (CDA-I) identifies defects in differentiation and nucleolar abnormalities. Haematologica 2021; 106:2960-2970. [PMID: 33121234 PMCID: PMC8561284 DOI: 10.3324/haematol.2020.260158] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 09/17/2020] [Indexed: 11/19/2022] Open
Abstract
The investigation of inherited disorders of erythropoiesis has elucidated many of the principles underlying the production of normal red blood cells and how this is perturbed in human disease. Congenital Dyserythropoietic Anaemia type 1 (CDA-I) is a rare form of anaemia caused by mutations in two genes of unknown function: CDAN1 and CDIN1 (previously called C15orf41), whilst in some cases, the underlying genetic abnormality is completely unknown. Consequently, the pathways affected in CDA-I remain to be discovered. To enable detailed analysis of this rare disorder we have validated a culture system which recapitulates all of the cardinal haematological features of CDA-I, including the formation of the pathognomonic 'spongy' heterochromatin seen by electron microscopy. Using a variety of cell and molecular biological approaches we discovered that erythroid cells in this condition show a delay during terminal erythroid differentiation, associated with increased proliferation and widespread changes in chromatin accessibility. We also show that the proteins encoded by CDAN1 and CDIN1 are enriched in nucleoli which are structurally and functionally abnormal in CDA-I. Together these findings provide important pointers to the pathways affected in CDA-I which for the first time can now be pursued in the tractable culture system utilised here.
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Affiliation(s)
- Caroline Scott
- Weatherall Institute of Molecular Medicine, Oxford University, Oxford.
| | - Damien J Downes
- Weatherall Institute of Molecular Medicine, Oxford University, Oxford
| | - Jill M Brown
- Weatherall Institute of Molecular Medicine, Oxford University, Oxford
| | - Robert Beagrie
- Weatherall Institute of Molecular Medicine, Oxford University, Oxford
| | | | - Matthew Gosden
- Weatherall Institute of Molecular Medicine, Oxford University, Oxford
| | - Ron Schwessinger
- Weatherall Institute of Molecular Medicine, Oxford University, Oxford
| | | | - Anna Rose
- Weatherall Institute of Molecular Medicine, Oxford University, Oxford
| | - David J P Ferguson
- Ultrastructural Morphology Group, NDCLS, John Radcliffe Hospital, Oxford
| | - Errin Johnson
- Sir William Dunn School of Pathology, Oxford University, Oxford
| | | | - Steven Okoli
- Imperial College, The Commonwealth Building, The Hammersmith Hospital, Du Cane Rd, London
| | - Raffaele Renella
- Pediatric Hematology-Oncology Research Laboratory, CHUV-UNIL Lausanne Switzerland
| | - Kate Ryan
- Department of Haematology, Manchester Royal Infirmary, Oxford Rd, Manchester
| | - Marjorie Brand
- Sprott Center for Stem Cell Research, Ottawa Hospital Research Institute, Ottawa
| | - Jim Hughes
- Weatherall Institute of Molecular Medicine, Oxford University, Oxford
| | - Noemi B A Roy
- Department of Haematology, Oxford University Hospitals NHS Trust, Churchill Hospital, Old Rd, Headington, and NIHR Biomedical Research Centre, Oxford
| | - Douglas R Higgs
- Weatherall Institute of Molecular Medicine, Oxford University, Oxford
| | - Christian Babbs
- Weatherall Institute of Molecular Medicine, Oxford University, Oxford
| | - Veronica J Buckle
- Weatherall Institute of Molecular Medicine, Oxford University, Oxford.
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Shrimpton AJ, Brown JM, Cook TM, Pickering AE. A quantitative evaluation of aerosol generation during supraglottic airway insertion and removal. Anaesthesia 2021; 77:230-231. [PMID: 34432884 DOI: 10.1111/anae.15572] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/08/2021] [Indexed: 11/30/2022]
Affiliation(s)
| | - J M Brown
- North Bristol NHS Trust, Bristol, UK
| | - T M Cook
- Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
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10
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Brown JM, Yelland MJ, Pullen T, Silva E, Martin A, Gold I, Whittle L, Wisse P. Novel use of social media to assess and improve coastal flood forecasts and hazard alerts. Sci Rep 2021; 11:13727. [PMID: 34215770 PMCID: PMC8253846 DOI: 10.1038/s41598-021-93077-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 06/18/2021] [Indexed: 11/30/2022] Open
Abstract
Coastal communities and infrastructure need protection from flooding and wave overtopping events. Assessment of hazard prediction methods, used in sea defence design, defence performance inspections and forecasting services, requires observations at the land-sea interface but these are rarely collected. Here we show how a database of hindcast overtopping events, and the conditions that cause them, can be built using qualitative overtopping information obtained from social media. We develop a database for a case study site at Crosby in the Northwest of England, use it to test the standard methods applied in operational flood forecasting services and new defence design, and suggest improvements to these methods. This novel approach will become increasingly important to deliver long-term, cost-effective coastal management solutions as sea-levels rise and coastal populations grow. At sites with limited, or no, monitoring or forecasting services, this approach, especially if combined with citizen science initiatives, could underpin the development of simplified early warning systems.
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Affiliation(s)
- J M Brown
- National Oceanography Centre, 6 Brownlow Street, Liverpool, L3 5AD, UK.
| | - M J Yelland
- National Oceanography Centre, European Way, Southampton, SO14 3ZH, UK
| | - T Pullen
- HR Wallingford, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, UK
| | - E Silva
- HR Wallingford, Howbery Park, Wallingford, Oxfordshire, OX10 8BA, UK
| | - A Martin
- Sefton Council, Trinity Road, Bootle, Liverpool, L20 3NJ, UK
| | - I Gold
- Environment Agency, Richard Fairclough House, Knutsford Road, Warrington, WA4 1HT, UK
| | - L Whittle
- Sefton Council, Trinity Road, Bootle, Liverpool, L20 3NJ, UK
| | - P Wisse
- Sefton Council, Trinity Road, Bootle, Liverpool, L20 3NJ, UK
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11
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Slade AL, Retzer A, Ahmed K, Kyte D, Keeley T, Armes J, Brown JM, Calman L, Gavin A, Glaser AW, Greenfield DM, Lanceley A, Taylor RM, Velikova G, Turner G, Calvert MJ. Systematic review of the use of translated patient-reported outcome measures in cancer trials. Trials 2021; 22:306. [PMID: 33902699 PMCID: PMC8074490 DOI: 10.1186/s13063-021-05255-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Accepted: 04/08/2021] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Patient-reported outcomes (PROs) are used in clinical trials to assess the effectiveness and tolerability of interventions. Inclusion of participants from different ethnic backgrounds is essential for generalisability of cancer trial results. PRO data collection should include appropriately translated patient-reported outcome measures (PROMs) to minimise missing data and sample attrition. METHODS Protocols and/or publications from cancer clinical trials using a PRO endpoint and registered on the National Institute for Health Research Portfolio were systematically reviewed for information on recruitment, inclusion of ethnicity data, and use of appropriately translated PROMs. Semi-structured interviews were conducted with key stakeholders to explore barriers and facilitators for optimal PRO trial design, diverse recruitment and reporting, and use of appropriately translated PROMs. RESULTS Eighty-four trials met the inclusion criteria, only 14 (17%) (n = 4754) reported ethnic group data, and ethnic group recruitment was low, 611 (13%). Although 8 (57%) studies were multi-centred and multi-national, none reported using translated PROMs, although available for 7 (88%) of the studies. Interviews with 44 international stakeholders identified a number of perceived barriers to ethnically diverse recruitment including diverse participant engagement, relevance of ethnicity to research question, prominence of PROs, and need to minimise investigator burden. Stakeholders had differing opinions on the use of translated PROMs, the impact of trial designs, and recruitment strategies on diverse recruitment. Facilitators of inclusive research were described and examples of good practice identified. CONCLUSIONS Greater transparency is required when PROs are used as primary or secondary outcomes in clinical trials. Protocols and publications should demonstrate that recruitment was accessible to diverse populations and facilitated by trial design, recruitment strategies, and appropriate PROM usage. The use of translated PROMs should be made explicit when used in cancer clinical trials.
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Affiliation(s)
- A L Slade
- Centre for Patient Reported Outcomes Research, Institute of Applied Health Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK. .,National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, University Hospitals Birmingham NHS Foundation Trust and the University of Birmingham, Birmingham, UK. .,National Institute for Health Research Surgical Reconstruction and Microbiology Research Centre, University of Birmingham, Birmingham, West Midlands, UK.
| | - A Retzer
- Centre for Patient Reported Outcomes Research, Institute of Applied Health Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - K Ahmed
- Birmingham Clinical Trials Unit, University of Birmingham, Birmingham, UK
| | - D Kyte
- Centre for Patient Reported Outcomes Research, Institute of Applied Health Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.,National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, University Hospitals Birmingham NHS Foundation Trust and the University of Birmingham, Birmingham, UK.,National Cancer Research Institute (NCRI) Psychosocial Oncology and Survivorship Clinical Studies Group subgroup: Understanding and measuring the consequences of cancer and its treatment, London, UK
| | - T Keeley
- Patient Centred Outcomes, GlaxoSmithKline, Brentford, UK
| | - J Armes
- National Cancer Research Institute (NCRI) Psychosocial Oncology and Survivorship Clinical Studies Group subgroup: Understanding and measuring the consequences of cancer and its treatment, London, UK.,School of Health Sciences, University of Surrey, Guildford, UK.,NIHR Applied Research Collaboration Kent Surrey & Sussex University of Surrey, Guildford, UK
| | - J M Brown
- Clinical Trials Research Unit, University of Leeds, Leeds, UK
| | - L Calman
- National Cancer Research Institute (NCRI) Psychosocial Oncology and Survivorship Clinical Studies Group subgroup: Understanding and measuring the consequences of cancer and its treatment, London, UK.,Macmillan Survivorship Research Group, Health Sciences, University of Southampton, Highfield Campus, Southampton, UK
| | - A Gavin
- National Cancer Research Institute (NCRI) Psychosocial Oncology and Survivorship Clinical Studies Group subgroup: Understanding and measuring the consequences of cancer and its treatment, London, UK.,Northern Ireland Cancer Registry, Centre for Public Health, Queens University Belfast, Belfast, Northern Ireland
| | - A W Glaser
- National Cancer Research Institute (NCRI) Psychosocial Oncology and Survivorship Clinical Studies Group subgroup: Understanding and measuring the consequences of cancer and its treatment, London, UK.,Leeds Institute of Medical Research at St James's, University of Leeds, Leeds, UK
| | - D M Greenfield
- National Cancer Research Institute (NCRI) Psychosocial Oncology and Survivorship Clinical Studies Group subgroup: Understanding and measuring the consequences of cancer and its treatment, London, UK.,Sheffield Teaching Hospital NHS Foundation Trust, Sheffield, UK
| | - A Lanceley
- National Cancer Research Institute (NCRI) Psychosocial Oncology and Survivorship Clinical Studies Group subgroup: Understanding and measuring the consequences of cancer and its treatment, London, UK.,Elizabeth Garrett Anderson Institute for Women's Health, University College London, London, UK
| | - R M Taylor
- National Cancer Research Institute (NCRI) Psychosocial Oncology and Survivorship Clinical Studies Group subgroup: Understanding and measuring the consequences of cancer and its treatment, London, UK.,Cancer Clinical Trials Unit, University College London Hospitals NHS Foundation Trust, London, UK
| | - G Velikova
- Leeds Institute of Medical Research at St James's, University of Leeds, Leeds, UK
| | - G Turner
- Centre for Patient Reported Outcomes Research, Institute of Applied Health Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - M J Calvert
- Centre for Patient Reported Outcomes Research, Institute of Applied Health Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK.,National Institute for Health Research (NIHR) Birmingham Biomedical Research Centre, University Hospitals Birmingham NHS Foundation Trust and the University of Birmingham, Birmingham, UK.,National Institute for Health Research Surgical Reconstruction and Microbiology Research Centre, University of Birmingham, Birmingham, West Midlands, UK.,National Institute for Health Research Applied Research Collaboration, University of Birmingham, Birmingham, West Midlands, UK.,Birmingham Health Partners Centre for Regulatory Science and Innovation, University of Birmingham, Birmingham, West Midlands, UK
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12
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Downey CL, Croft J, Ainsworth G, Buckley H, Shinkins B, Randell R, Brown JM, Jayne DG. Trial of remote continuous versus intermittent NEWS monitoring after major surgery (TRaCINg): a feasibility randomised controlled trial. Pilot Feasibility Stud 2020; 6:183. [PMID: 33292669 PMCID: PMC7684886 DOI: 10.1186/s40814-020-00709-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 10/16/2020] [Indexed: 01/12/2023] Open
Abstract
BACKGROUND Despite medical advances, major surgery remains high risk with up to 44% of patients experiencing postoperative complications. Early recognition of postoperative complications is crucial in reducing morbidity and preventing long-term disability. The current standard of care is intermittent manual vital signs monitoring, but new wearable remote monitors offer the benefits of continuous vital signs monitoring without limiting the patient's mobility. The aim of this study was to evaluate the feasibility, acceptability and clinical outcomes of continuous remote monitoring after major surgery. METHODS The study was a randomised, controlled, unblinded, parallel group, feasibility trial. Adult patients undergoing elective major surgery were randomly assigned to receive continuous remote monitoring and normal National Early Warning Score (NEWS) monitoring (intervention group) or normal NEWS monitoring alone (control group). Continuous remote monitoring was achieved using the SensiumVitals® wireless patch which is worn on the patient's chest and monitors heart rate, respiratory rate and temperature continuously, and alerts the nurse when there is deviation from pre-set physiological norms. Feasibility was assessed by evaluating recruitment rate, adherence to protocol and randomisation and the amount of missing data. Clinical outcomes included time to antibiotics in cases of sepsis, length of hospital stay, number of critical care admissions and rate of hospital readmission within 30 days of discharge. RESULTS One hundred and thirty-six patients were randomised between October 2018 and April 2019: 67 to the control group and 69 to the intervention group. Recruitment was completed prior to the 12 month target with a high rate of eligibility and consent. Missing data was limited only to questionnaire responses; no participants were lost to follow-up and only one participant was withdrawn due to loss of capacity. The number of patients classed as 'drop-out' due to design (8.1%) were less than anticipated, and there were no participants who crossed over into the alternative trial allocation group. Seventeen participants in the intervention group (28%) did not adhere to the monitoring protocol. No formal comparisons between arms was undertaken; however, participants had fewer unplanned critical care admissions (1 versus 5) and had a shorter average length of hospital stay (11.6 days (95% confidence interval 9.5-13.7 days) versus 16.2 days (95% confidence interval 11.3-21.2 days)) in the continuous vital signs monitoring group. The time taken to receive antibiotics in cases of sepsis was similar in both arms. A cost-utility analysis indicated that the remote monitoring system was cost-saving when compared to standard NEWS monitoring alone. CONCLUSIONS It is feasible to perform a large-scale randomised controlled trial of continuous remote monitoring after major surgery. Progression to a definitive multicentre randomised controlled trial would be appropriate, taking consideration of factors, such as patient adherence, that might mask the potential benefit of additional monitoring. TRIAL REGISTRATION ISRCTN registry with study ID ISRCTN16601772 . Registered 30 August 2017.
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Affiliation(s)
- C L Downey
- Leeds Institute of Medical Research at St James's, University of Leeds, Leeds, LS9 7TF, UK.
- St James's University Hospital, Level 7, Clinical Sciences Building, Leeds, LS9 7TF, UK.
| | - J Croft
- Clinical Trials Research Unit, Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, LS2 9NL, UK
| | - G Ainsworth
- Clinical Trials Research Unit, Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, LS2 9NL, UK
| | - H Buckley
- Clinical Trials Research Unit, Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, LS2 9NL, UK
| | - B Shinkins
- Academic Unit of Health Economics, University of Leeds, Leeds, LS2 9NL, UK
| | - R Randell
- School of Healthcare, Baines Wing, University of Leeds, Leeds, LS2 9JT, UK
| | - J M Brown
- Clinical Trials Research Unit, Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, LS2 9NL, UK
| | - D G Jayne
- Leeds Institute of Medical Research at St James's, University of Leeds, Leeds, LS9 7TF, UK
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13
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Waithe D, Brown JM, Reglinski K, Diez-Sevilla I, Roberts D, Eggeling C. Object detection networks and augmented reality for cellular detection in fluorescence microscopy. J Cell Biol 2020; 219:e201903166. [PMID: 32854116 PMCID: PMC7659718 DOI: 10.1083/jcb.201903166] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 05/05/2020] [Accepted: 07/21/2020] [Indexed: 01/10/2023] Open
Abstract
Object detection networks are high-performance algorithms famously applied to the task of identifying and localizing objects in photography images. We demonstrate their application for the classification and localization of cells in fluorescence microscopy by benchmarking four leading object detection algorithms across multiple challenging 2D microscopy datasets. Furthermore we develop and demonstrate an algorithm that can localize and image cells in 3D, in close to real time, at the microscope using widely available and inexpensive hardware. Furthermore, we exploit the fast processing of these networks and develop a simple and effective augmented reality (AR) system for fluorescence microscopy systems using a display screen and back-projection onto the eyepiece. We show that it is possible to achieve very high classification accuracy using datasets with as few as 26 images present. Using our approach, it is possible for relatively nonskilled users to automate detection of cell classes with a variety of appearances and enable new avenues for automation of fluorescence microscopy acquisition pipelines.
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Affiliation(s)
- Dominic Waithe
- Wolfson Imaging Centre Oxford, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
- Medical Research Council Centre for Computational Biology, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Jill M. Brown
- Medical Research Council Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Katharina Reglinski
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
- Institute of Applied Optics and Biophysics, Friedrich Schiller University Jena, Jena, Germany
- University Hospital Jena, Jena, Germany
| | - Isabel Diez-Sevilla
- Nuffield Division of Clinical Laboratory Sciences, Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - David Roberts
- Nuffield Division of Clinical Laboratory Sciences, Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Oxford, UK
| | - Christian Eggeling
- Wolfson Imaging Centre Oxford, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
- Institute of Applied Optics and Biophysics, Friedrich Schiller University Jena, Jena, Germany
- Leibniz Institute of Photonic Technology e.V., Jena, Germany
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14
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Miron E, Oldenkamp R, Brown JM, Pinto DMS, Xu CS, Faria AR, Shaban HA, Rhodes JDP, Innocent C, de Ornellas S, Hess HF, Buckle V, Schermelleh L. Chromatin arranges in chains of mesoscale domains with nanoscale functional topography independent of cohesin. Sci Adv 2020; 6:eaba8811. [PMID: 32967822 PMCID: PMC7531892 DOI: 10.1126/sciadv.aba8811] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Accepted: 08/06/2020] [Indexed: 05/05/2023]
Abstract
Three-dimensional (3D) chromatin organization plays a key role in regulating mammalian genome function; however, many of its physical features at the single-cell level remain underexplored. Here, we use live- and fixed-cell 3D super-resolution and scanning electron microscopy to analyze structural and functional nuclear organization in somatic cells. We identify chains of interlinked ~200- to 300-nm-wide chromatin domains (CDs) composed of aggregated nucleosomes that can overlap with individual topologically associating domains and are distinct from a surrounding RNA-populated interchromatin compartment. High-content mapping uncovers confinement of cohesin and active histone modifications to surfaces and enrichment of repressive modifications toward the core of CDs in both hetero- and euchromatic regions. This nanoscale functional topography is temporarily relaxed in postreplicative chromatin but remarkably persists after ablation of cohesin. Our findings establish CDs as physical and functional modules of mesoscale genome organization.
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Affiliation(s)
- Ezequiel Miron
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Roel Oldenkamp
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Jill M Brown
- MRC Weatherall Institute of Molecular Medicine, Haematology Unit, University of Oxford, Oxford OX3 9DS, UK
| | - David M S Pinto
- Micron Oxford Advanced Bioimaging Unit, University of Oxford, Oxford OX1 3QU, UK
| | - C Shan Xu
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA
| | - Ana R Faria
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | - Haitham A Shaban
- Spectroscopy Department, Physics Division, National Research Centre, 12622 Dokki, Cairo, Egypt
| | - James D P Rhodes
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK
| | | | - Sara de Ornellas
- MRC Weatherall Institute of Molecular Medicine, Haematology Unit, University of Oxford, Oxford OX3 9DS, UK
| | - Harald F Hess
- Janelia Research Campus, Howard Hughes Medical Institute, Ashburn, VA 20147, USA
| | - Veronica Buckle
- MRC Weatherall Institute of Molecular Medicine, Haematology Unit, University of Oxford, Oxford OX3 9DS, UK
| | - Lothar Schermelleh
- Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK.
- Micron Oxford Advanced Bioimaging Unit, University of Oxford, Oxford OX1 3QU, UK
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15
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Emmerson J, Brown JM. Understanding Survival Analysis in Clinical Trials. Clin Oncol (R Coll Radiol) 2020; 33:12-14. [PMID: 32788065 DOI: 10.1016/j.clon.2020.07.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 06/30/2020] [Accepted: 07/15/2020] [Indexed: 11/26/2022]
Affiliation(s)
- J Emmerson
- Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, UK.
| | - J M Brown
- Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, UK
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16
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Rhodes JDP, Feldmann A, Hernández-Rodríguez B, Díaz N, Brown JM, Fursova NA, Blackledge NP, Prathapan P, Dobrinic P, Huseyin MK, Szczurek A, Kruse K, Nasmyth KA, Buckle VJ, Vaquerizas JM, Klose RJ. Cohesin Disrupts Polycomb-Dependent Chromosome Interactions in Embryonic Stem Cells. Cell Rep 2020; 30:820-835.e10. [PMID: 31968256 PMCID: PMC6988126 DOI: 10.1016/j.celrep.2019.12.057] [Citation(s) in RCA: 93] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Revised: 11/25/2019] [Accepted: 12/16/2019] [Indexed: 12/21/2022] Open
Abstract
How chromosome organization is related to genome function remains poorly understood. Cohesin, loop extrusion, and CCCTC-binding factor (CTCF) have been proposed to create topologically associating domains (TADs) to regulate gene expression. Here, we examine chromosome conformation in embryonic stem cells lacking cohesin and find, as in other cell types, that cohesin is required to create TADs and regulate A/B compartmentalization. However, in the absence of cohesin, we identify a series of long-range chromosomal interactions that persist. These correspond to regions of the genome occupied by the polycomb repressive system and are dependent on PRC1. Importantly, we discover that cohesin counteracts these polycomb-dependent interactions, but not interactions between super-enhancers. This disruptive activity is independent of CTCF and insulation and appears to modulate gene repression by the polycomb system. Therefore, we discover that cohesin disrupts polycomb-dependent chromosome interactions to modulate gene expression in embryonic stem cells.
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Affiliation(s)
- James D P Rhodes
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Angelika Feldmann
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | | | - Noelia Díaz
- Max Planck Institute for Molecular Biomedicine, Roentgenstrasse 20, 48149 Muenster, Germany
| | - Jill M Brown
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford OX3 9DS, UK
| | - Nadezda A Fursova
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Neil P Blackledge
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Praveen Prathapan
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Paula Dobrinic
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Miles K Huseyin
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Aleksander Szczurek
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Kai Kruse
- Max Planck Institute for Molecular Biomedicine, Roentgenstrasse 20, 48149 Muenster, Germany
| | - Kim A Nasmyth
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK
| | - Veronica J Buckle
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford OX3 9DS, UK
| | - Juan M Vaquerizas
- Max Planck Institute for Molecular Biomedicine, Roentgenstrasse 20, 48149 Muenster, Germany; MRC London Institute of Medical Sciences, Institute of Clinical Sciences, Faculty of Medicine, Imperial College London, Du Cane Road, London W12 0NN, UK.
| | - Robert J Klose
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK.
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17
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Papadimitriou-Olivgeri I, Brown JM, Kilpatrick AFR, Gill HS, Athanasou NA. Correction to: Solochrome cyanine: A histological stain for cobalt-chromium wear particles in metal-on-metal periprosthetic tissues. J Mater Sci Mater Med 2019; 30:110. [PMID: 31555914 PMCID: PMC6828412 DOI: 10.1007/s10856-019-6312-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
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Affiliation(s)
- I Papadimitriou-Olivgeri
- Department of Histopathology, NDORMS, University of Oxford, Nuffield Orthopaedic Centre, Oxford, OX3 7HE, UK
| | - J M Brown
- Department of Histopathology, NDORMS, University of Oxford, Nuffield Orthopaedic Centre, Oxford, OX3 7HE, UK
| | - A F R Kilpatrick
- Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
| | - H S Gill
- Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, UK
| | - N A Athanasou
- Department of Histopathology, NDORMS, University of Oxford, Nuffield Orthopaedic Centre, Oxford, OX3 7HE, UK.
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18
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Papadimitriou-Olivgeri I, Brown JM, Kilpatrick AFR, Gill HS, Athanasou NA. Solochrome cyanine: A histological stain for cobalt-chromium wear particles in metal-on-metal periprosthetic tissues. J Mater Sci Mater Med 2019; 30:103. [PMID: 31493091 PMCID: PMC6731196 DOI: 10.1007/s10856-019-6304-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 08/23/2019] [Indexed: 06/10/2023]
Abstract
Metal-on-metal (MoM) hip arthroplasties produce abundant implant-derived wear debris composed mainly of cobalt (Co) and chromium (Cr). Cobalt-chromium (Co-Cr) wear particles are difficult to identify histologically and need to be distinguished from other wear particle types and endogenous components (e.g., haemosiderin, fibrin) which may be present in MoM periprosthetic tissues. In this study we sought to determine whether histological stains that have an affinity for metals are useful in identifying Co-Cr wear debris in MoM periprosthetic tissues. Histological sections of periprosthetic tissue from 30 failed MoM hip arthroplasties were stained with haematoxylin-eosin (HE), Solochrome Cyanine (SC), Solochrome Azurine (SA) and Perls' Prussian Blue (PB). Sections of periprosthetic tissue from 10 cases of non-MoM arthroplasties using other implant biomaterials, including titanium, ceramic, polymethylmethacrylate (PMMA) and ultra-high molecular weight polyethylene (UHMWP) were similarly analysed. Sections of 10 cases of haemosiderin-containing knee tenosynovial giant cell tumour (TSGCT) were also stained with HE, SC, SA and PB. In MoM periprosthetic tissues, SC stained metal debris in phagocytic macrophages and in the superficial necrotic zone which exhibited little or no trichrome staining for fibrin. In non-MoM periprosthetic tissues, UHMWP, PMMA, ceramic and titanium particles were not stained by SC. Prussian Blue, but not SC or SA, stained haemosiderin deposits in MoM periprosthetic tissues and TSGT. Our findings show that SC staining (most likely Cr-associated) is useful in distinguishing Co-Cr wear particles from other metal/non-metal wear particles types in histological preparations of periprosthetic tissue and that SC reliably distinguishes haemosiderin from Co-Cr wear debris.
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Affiliation(s)
- I Papadimitriou-Olivgeri
- Department of Histopathology, NDORMS, University of Oxford, Nuffield Orthopaedic Centre, Oxford, OX3 7HE, UK
| | - J M Brown
- Department of Histopathology, NDORMS, University of Oxford, Nuffield Orthopaedic Centre, Oxford, OX3 7HE, UK
| | - A F R Kilpatrick
- Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, UK
| | - H S Gill
- Department of Mechanical Engineering, University of Bath, Bath, BA2 7AY, UK
| | - N A Athanasou
- Department of Histopathology, NDORMS, University of Oxford, Nuffield Orthopaedic Centre, Oxford, OX3 7HE, UK.
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19
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Mullane KM, Morrison VA, Camacho LH, Arvin A, McNeil SA, Durrand J, Campbell B, Su SC, Chan ISF, Parrino J, Kaplan SS, Popmihajlov Z, Annunziato PW, Cerana S, Dictar MO, Bonvehi P, Tregnaghi JP, Fein L, Ashley D, Singh M, Hayes T, Playford G, Morrissey O, Thaler J, Kuehr T, Greil R, Pecherstorfer M, Duck L, Van Eygen K, Aoun M, De Prijck B, Franke FA, Barrios CHE, Mendes AVA, Serrano SV, Garcia RF, Moore F, Camargo JFC, Pires LA, Alves RS, Radinov A, Oreshkov K, Minchev V, Hubenova AI, Koynova T, Ivanov I, Rabotilova B, Minchev V, Petrov PA, Chilingirov P, Karanikolov S, Raynov J, Grimard D, McNeil S, Kumar D, Larratt LM, Weiss K, Delage R, Diaz-Mitoma FJ, Cano PO, Couture F, Carvajal P, Yepes A, Torres Ulloa R, Fardella P, Caglevic C, Rojas C, Orellana E, Gonzalez P, Acevedo A, Galvez KM, Gonzalez ME, Franco S, Restrepo JG, Rojas CA, Bonilla C, Florez LE, Ospina AV, Manneh R, Zorica R, Vrdoljak DV, Samarzija M, Petruzelka L, Vydra J, Mayer J, Cibula D, Prausova J, Paulson G, Ontaneda M, Palk K, Vahlberg A, Rooneem R, Galtier F, Postil D, Lucht F, Laine F, Launay O, Laurichesse H, Duval X, Cornely OA, Camerer B, Panse J, Zaiss M, Derigs HG, Menzel H, Verbeek M, Georgoulias V, Mavroudis D, Anagnostopoulos A, Terpos E, Cortes D, Umanzor J, Bejarano S, Galeano RW, Wong RSM, Hui P, Pedrazzoli P, Ruggeri L, Aversa F, Bosi A, Gentile G, Rambaldi A, Contu A, Marei L, Abbadi A, Hayajneh W, Kattan J, Farhat F, Chahine G, Rutkauskiene J, Marfil Rivera LJ, Lopez Chuken YA, Franco Villarreal H, Lopez Hernandez J, Blacklock H, Lopez RI, Alvarez R, Gomez AM, Quintana TS, Moreno Larrea MDC, Zorrilla SJ, Alarcon E, Samanez FCA, Caguioa PB, Tiangco BJ, Mora EM, Betancourt-Garcia RD, Hallman-Navarro D, Feliciano-Lopez LJ, Velez-Cortes HA, Cabanillas F, Ganea DE, Ciuleanu TE, Ghizdavescu DG, Miron L, Cebotaru CL, Cainap CI, Anghel R, Dvorkin MV, Gladkov OA, Fadeeva NV, Kuzmin AA, Lipatov ON, Zbarskaya II, Akhmetzyanov FS, Litvinov IV, Afanasyev BV, Cherenkova M, Lioznov D, Lisukov IA, Smirnova YA, Kolomietz S, Halawani H, Goh YT, Drgona L, Chudej J, Matejkova M, Reckova M, Rapoport BL, Szpak WM, Malan DR, Jonas N, Jung CW, Lee DG, Yoon SS, Lopez Jimenez J, Duran Martinez I, Rodriguez Moreno JF, Solano Vercet C, de la Camara R, Batlle Massana M, Yeh SP, Chen CY, Chou HH, Tsai CM, Chiu CH, Siritanaratkul N, Norasetthada L, Sriuranpong V, Seetalarom K, Akan H, Dane F, Ozcan MA, Ozsan GH, Kalayoglu Besisik SF, Cagatay A, Yalcin S, Peniket A, Mullan SR, Dakhil KM, Sivarajan K, Suh JJG, Sehgal A, Marquez F, Gomez EG, Mullane MR, Skinner WL, Behrens RJ, Trevarthe DR, Mazurczak MA, Lambiase EA, Vidal CA, Anac SY, Rodrigues GA, Baltz B, Boccia R, Wertheim MS, Holladay CS, Zenk D, Fusselman W, Wade III JL, Jaslowsk AJ, Keegan J, Robinson MO, Go RS, Farnen J, Amin B, Jurgens D, Risi GF, Beatty PG, Naqvi T, Parshad S, Hansen VL, Ahmed M, Steen PD, Badarinath S, Dekker A, Scouros MA, Young DE, Graydon Harker W, Kendall SD, Citron ML, Chedid S, Posada JG, Gupta MK, Rafiyath S, Buechler-Price J, Sreenivasappa S, Chay CH, Burke JM, Young SE, Mahmood A, Kugler JW, Gerstner G, Fuloria J, Belman ND, Geller R, Nieva J, Whittenberger BP, Wong BMY, Cescon TP, Abesada-Terk G, Guarino MJ, Zweibach A, Ibrahim EN, Takahashi G, Garrison MA, Mowat RB, Choi BS, Oliff IA, Singh J, Guter KA, Ayrons K, Rowland KM, Noga SJ, Rao SB, Columbie A, Nualart MT, Cecchi GR, Campos LT, Mohebtash M, Flores MR, Rothstein-Rubin R, O'Connor BM, Soori G, Knapp M, Miranda FG, Goodgame BW, Kassem M, Belani R, Sharma S, Ortiz T, Sonneborn HL, Markowitz AB, Wilbur D, Meiri E, Koo VS, Jhangiani HS, Wong L, Sanani S, Lawrence SJ, Jones CM, Murray C, Papageorgiou C, Gurtler JS, Ascensao JL, Seetalarom K, Venigalla ML, D'Andrea M, De Las Casas C, Haile DJ, Qazi FU, Santander JL, Thomas MR, Rao VP, Craig M, Garg RJ, Robles R, Lyons RM, Stegemoller RK, Goel S, Garg S, Lowry P, Lynch C, Lash B, Repka T, Baker J, Goueli BS, Campbell TC, Van Echo DA, Lee YJ, Reyes EA, Senecal FM, Donnelly G, Byeff P, Weiss R, Reid T, Roeland E, Goel A, Prow DM, Brandt DS, Kaplan HG, Payne JE, Boeckh MG, Rosen PJ, Mena RR, Khan R, Betts RF, Sharp SA, Morrison VA, Fitz-Patrick D, Congdon J, Erickson N, Abbasi R, Henderson S, Mehdi A, Wos EJ, Rehmus E, Beltzer L, Tamayo RA, Mahmood T, Reboli AC, Moore A, Brown JM, Cruz J, Quick DP, Potz JL, Kotz KW, Hutchins M, Chowhan NM, Devabhaktuni YD, Braly P, Berenguer RA, Shambaugh SC, O'Rourke TJ, Conkright WA, Winkler CF, Addo FEK, Duic JP, High KP, Kutner ME, Collins R, Carrizosa DR, Perry DJ, Kailath E, Rosen N, Sotolongo R, Shoham S, Chen T. Safety and efficacy of inactivated varicella zoster virus vaccine in immunocompromised patients with malignancies: a two-arm, randomised, double-blind, phase 3 trial. The Lancet Infectious Diseases 2019; 19:1001-1012. [DOI: 10.1016/s1473-3099(19)30310-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 05/02/2019] [Accepted: 05/03/2019] [Indexed: 12/25/2022]
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Kotecha T, Martinez-Naharro A, Lambe T, Francis RD, Chacko LIZA, Brown JM, Knight DS, Hawkins PN, Moon JM, Kellman PN, Bulluck H, Hausenloy DS, Rakhit RD, Fontana M. 48Quantification of myocardial infarct size and microvascular obstruction using dark-blood late gadolinium enhancement. Eur Heart J Cardiovasc Imaging 2019. [DOI: 10.1093/ehjci/jez112.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- T Kotecha
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - A Martinez-Naharro
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - T Lambe
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - R D Francis
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - L I Z A Chacko
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - J M Brown
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - D S Knight
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - P N Hawkins
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - J M Moon
- Barts Health NHS Trust, London, United Kingdom of Great Britain & Northern Ireland
| | - P N Kellman
- National Institutes of Health, Bethesda, United States of America
| | - H Bulluck
- Norfolk and Norwich University Hospital, Norwich, United Kingdom of Great Britain & Northern Ireland
| | - D S Hausenloy
- National Heart Centre Singapore, Singapore, Singapore
| | - R D Rakhit
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - M Fontana
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
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Kotecha T, Martinez-Naharro A, Little C, Chacko LIZA, Manmathan G, Brown JM, Knight DS, Hawkins PN, Moon JM, Xue H, Lockie T, Rakhit RD, Kellman PN, Patel N, Fontana M. 303Quantitative CMR perfusion mapping to detect microvascular dysfunction in patients without obstructive coronary disease. Eur Heart J Cardiovasc Imaging 2019. [DOI: 10.1093/ehjci/jez119.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- T Kotecha
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - A Martinez-Naharro
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - C Little
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - L I Z A Chacko
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - G Manmathan
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - J M Brown
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - D S Knight
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - P N Hawkins
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - J M Moon
- Barts Health NHS Trust, London, United Kingdom of Great Britain & Northern Ireland
| | - H Xue
- National Institutes of Health, Bethesda, United States of America
| | - T Lockie
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - R D Rakhit
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - P N Kellman
- National Institutes of Health, Bethesda, United States of America
| | - N Patel
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - M Fontana
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
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Kotecha T, Monteagudo JM, Martinez-Naharro A, Little C, Chacko LIZA, Brown JM, Knight D, Hawkins PN, Moon JM, Xue H, Kellman PN, Patel N, Lockie T, Rakhit RD, Fontana M. 302Redefining assessment of adenosine stress response using CMR perfusion mapping: An alternative to splenic switch off. Eur Heart J Cardiovasc Imaging 2019. [DOI: 10.1093/ehjci/jez119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- T Kotecha
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - J M Monteagudo
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - A Martinez-Naharro
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - C Little
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - L I Z A Chacko
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - J M Brown
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - D Knight
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - P N Hawkins
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - J M Moon
- Barts Health NHS Trust, London, United Kingdom of Great Britain & Northern Ireland
| | - H Xue
- National Institutes of Health, Bethesda, United States of America
| | - P N Kellman
- National Institutes of Health, Bethesda, United States of America
| | - N Patel
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - T Lockie
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - R D Rakhit
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
| | - M Fontana
- Royal Free Hospital , Cardiology, London, United Kingdom of Great Britain & Northern Ireland
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Bolton WS, Aruparayil N, Quyn A, Scott J, Wood A, Bundu I, Gnanaraj J, Brown JM, Jayne DG. Disseminating technology in global surgery. Br J Surg 2019; 106:e34-e43. [DOI: 10.1002/bjs.11036] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 10/02/2018] [Indexed: 12/12/2022]
Abstract
Abstract
Background
Effective dissemination of technology in global surgery is vital to realize universal health coverage by 2030. Challenges include a lack of human resource, infrastructure and finance. Understanding these challenges, and exploring opportunities and solutions to overcome them, are essential to improve global surgical care.
Methods
This review focuses on technologies and medical devices aimed at improving surgical care and training in low- and middle-income countries. The key considerations in the development of new technologies are described, along with strategies for evaluation and wider dissemination. Notable examples of where the dissemination of a new surgical technology has achieved impact are included.
Results
Employing the principles of frugal and responsible innovation, and aligning evaluation and development to high scientific standards help overcome some of the challenges in disseminating technology in global surgery. Exemplars of effective dissemination include low-cost laparoscopes, gasless laparoscopic techniques and innovative training programmes for laparoscopic surgery; low-cost and versatile external fixation devices for fractures; the LifeBox pulse oximeter project; and the use of immersive technologies in simulation, training and surgical care delivery.
Conclusion
Core strategies to facilitate technology dissemination in global surgery include leveraging international funding, interdisciplinary collaboration involving all key stakeholders, and frugal scientific design, development and evaluation.
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Affiliation(s)
- W S Bolton
- Section of Translational Anaesthesia and Surgery, Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, UK
| | - N Aruparayil
- Section of Translational Anaesthesia and Surgery, Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, UK
| | - A Quyn
- Section of Translational Anaesthesia and Surgery, Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, UK
| | - J Scott
- Leeds Vascular Institute, Leeds General Infirmary, Leeds Teaching Hospitals NHS Trust, Leeds, UK
| | - A Wood
- Department of Orthopaedic Surgery, Leeds General Infirmary, Leeds, UK
| | - I Bundu
- Department of Surgery, Connaught Hospital, Freetown, Sierra Leone
| | - J Gnanaraj
- Karunya Institute of Technology and Science, Karunya Nagar, Coimbatore, India
| | - J M Brown
- Leeds Institute for Clinical Trials Research, University of Leeds, Leeds, UK
| | - D G Jayne
- Section of Translational Anaesthesia and Surgery, Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds, UK
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Oudelaar AM, Davies JOJ, Hanssen LLP, Telenius JM, Schwessinger R, Liu Y, Brown JM, Downes DJ, Chiariello AM, Bianco S, Nicodemi M, Buckle VJ, Dekker J, Higgs DR, Hughes JR. Single-allele chromatin interactions identify regulatory hubs in dynamic compartmentalized domains. Nat Genet 2018; 50:1744-1751. [PMID: 30374068 PMCID: PMC6265079 DOI: 10.1038/s41588-018-0253-2] [Citation(s) in RCA: 114] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 09/07/2018] [Indexed: 11/09/2022]
Abstract
The promoters of mammalian genes are commonly regulated by multiple distal enhancers, which physically interact within discrete chromatin domains. How such domains form and how the regulatory elements within them interact in single cells is not understood. To address this we developed Tri-C, a new Chromosome Conformation Capture (3C) approach to identify concurrent chromatin interactions at individual alleles. Analysis by Tri-C reveals heterogeneous patterns of single-allele interactions between CTCF boundary elements, indicating that the formation of chromatin domains likely results from a dynamic process. Within these domains, we observe specific higher-order structures involving simultaneous interactions between multiple enhancers and promoters. Such regulatory hubs provide a structural basis for understanding how multiple cis-regulatory elements act together to establish robust regulation of gene expression.
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Affiliation(s)
- A Marieke Oudelaar
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK.,MRC WIMM Centre for Computational Biology, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - James O J Davies
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Lars L P Hanssen
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Jelena M Telenius
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK.,MRC WIMM Centre for Computational Biology, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Ron Schwessinger
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK.,MRC WIMM Centre for Computational Biology, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Yu Liu
- Program in Systems Biology, Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA, USA
| | - Jill M Brown
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Damien J Downes
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Andrea M Chiariello
- Dipartimento di Fisica, Università di Napoli Federico II, and INFN Napoli, Complesso di Monte Sant'Angelo, Naples, Italy
| | - Simona Bianco
- Dipartimento di Fisica, Università di Napoli Federico II, and INFN Napoli, Complesso di Monte Sant'Angelo, Naples, Italy
| | - Mario Nicodemi
- Dipartimento di Fisica, Università di Napoli Federico II, and INFN Napoli, Complesso di Monte Sant'Angelo, Naples, Italy
| | - Veronica J Buckle
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Job Dekker
- Program in Systems Biology, Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA, USA.,Howard Hughes Medical Institute, Chevy Chase, MD, USA
| | - Douglas R Higgs
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK
| | - Jim R Hughes
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK. .,MRC WIMM Centre for Computational Biology, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, UK.
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Brown JM, Roberts NA, Graham B, Waithe D, Lagerholm C, Telenius JM, De Ornellas S, Oudelaar AM, Scott C, Szczerbal I, Babbs C, Kassouf MT, Hughes JR, Higgs DR, Buckle VJ. A tissue-specific self-interacting chromatin domain forms independently of enhancer-promoter interactions. Nat Commun 2018; 9:3849. [PMID: 30242161 PMCID: PMC6155075 DOI: 10.1038/s41467-018-06248-4] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 08/24/2018] [Indexed: 11/08/2022] Open
Abstract
Self-interacting chromatin domains encompass genes and their cis-regulatory elements; however, the three-dimensional form a domain takes, whether this relies on enhancer-promoter interactions, and the processes necessary to mediate the formation and maintenance of such domains, remain unclear. To examine these questions, here we use a combination of high-resolution chromosome conformation capture, a non-denaturing form of fluorescence in situ hybridisation and super-resolution imaging to study a 70 kb domain encompassing the mouse α-globin regulatory locus. We show that this region forms an erythroid-specific, decompacted, self-interacting domain, delimited by frequently apposed CTCF/cohesin binding sites early in terminal erythroid differentiation, and does not require transcriptional elongation for maintenance of the domain structure. Formation of this domain does not rely on interactions between the α-globin genes and their major enhancers, suggesting a transcription-independent mechanism for establishment of the domain. However, absence of the major enhancers does alter internal domain interactions. Formation of a loop domain therefore appears to be a mechanistic process that occurs irrespective of the specific interactions within.
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Affiliation(s)
- Jill M Brown
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK
| | - Nigel A Roberts
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK
| | - Bryony Graham
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK
| | - Dominic Waithe
- Wolfson Imaging Centre Oxford, MRC Weatherall Institute of Molecular Medicine, Oxford, OX3 9DS, UK
| | - Christoffer Lagerholm
- Wolfson Imaging Centre Oxford, MRC Weatherall Institute of Molecular Medicine, Oxford, OX3 9DS, UK
| | - Jelena M Telenius
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK
| | - Sara De Ornellas
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK
| | - A Marieke Oudelaar
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK
| | - Caroline Scott
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK
| | - Izabela Szczerbal
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK
- Department of Genetics and Animal Breeding, Poznan University of Life Sciences, Wolynska 33, 60-637 Poznan, Poland
| | - Christian Babbs
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK
| | - Mira T Kassouf
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK
| | - Jim R Hughes
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK
| | - Douglas R Higgs
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK
| | - Veronica J Buckle
- MRC Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS, UK.
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Downey CL, Croft J, Buckley H, Randell R, Brown JM, Jayne DG. Trial of Remote Continuous versus Intermittent NEWS monitoring after major surgery (TRaCINg): protocol for a feasibility randomised controlled trial. Pilot Feasibility Stud 2018; 4:112. [PMID: 29992041 PMCID: PMC5994656 DOI: 10.1186/s40814-018-0299-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Accepted: 05/21/2018] [Indexed: 01/21/2023] Open
Abstract
Background Despite medical advances, major surgery remains high risk. Up to 44% of patients experience postoperative complications, which can have huge impacts for patients and the healthcare system. Early recognition of postoperative complications is crucial in reducing morbidity and preventing long-term disability. The current standard of care is intermittent manual vital signs monitoring, but new wearable remote monitors offer the benefits of continuous vital signs monitoring without limiting the patient's mobility. The aim of this study is to evaluate the feasibility, acceptability and clinical impacts of continuous remote monitoring after major surgery. Methods The study is a randomised, controlled, unblinded, parallel group, feasibility trial. Adult patients undergoing elective major surgery will be invited to participate if they have the capacity to provided informed, written consent and do not have a cardiac pacemaker or an allergy to adhesives. Participants will be randomly assigned to receive continuous remote monitoring and normal National Early Warning Score (NEWS) monitoring (intervention group) or normal NEWS monitoring alone (control group). Continuous remote monitoring will be achieved using the SensiumVitals® wireless patch which is worn on the patient's chest and monitors heart rate, respiratory rate and temperature continuously and alerts the nurse when there is deviation from pre-set physiological norms. Participants will be followed up throughout their hospital admission and for 30 days after discharge. Feasibility will be assessed by evaluating recruitment rate, adherence to protocol and randomisation, and the amount of missing data. The acceptability of the patch to nursing staff and patients will be assessed using questionnaires and interviews. Clinical outcomes will include time to antibiotics in cases of sepsis, length of hospital stay, number of critical care admissions and rate of readmission within 30 days of discharge. Discussion Early detection and treatment of complications minimises the need for critical care, improves patient outcomes, and produces significant cost savings for the healthcare system. Remote continuous monitoring systems have the potential to allow earlier detection of complications, but evidence from the literature is mixed. Demonstrating significant benefit over intermittent monitoring to offset the practical and economic implications of continuous monitoring requires well-controlled studies in high-risk populations to demonstrate significant differences in clinical outcomes; this feasibility trial seeks to provide evidence of how best to conduct such a confirmatory trial. Trial registration This study is listed on the ISRCTN registry with study ID ISRCTN16601772.
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Affiliation(s)
- C L Downey
- Leeds Institute of Biomedical and Clinical Sciences, Clinical Sciences Building, St. James's University Hospital, University of Leeds, Level 7 Clinical Sciences Building, Leeds, LS9 7TF UK
| | - J Croft
- 2Clinical Trials Research Unit, Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, LS2 9NL UK
| | - H Buckley
- 2Clinical Trials Research Unit, Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, LS2 9NL UK
| | - R Randell
- 3School of Healthcare, Baines Wing, University of Leeds, Leeds, LS2 9JT UK
| | - J M Brown
- 2Clinical Trials Research Unit, Leeds Institute of Clinical Trials Research, University of Leeds, Leeds, LS2 9NL UK
| | - D G Jayne
- Leeds Institute of Biomedical and Clinical Sciences, Clinical Sciences Building, St. James's University Hospital, University of Leeds, Level 7 Clinical Sciences Building, Leeds, LS9 7TF UK
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Downey CL, Chapman S, Randell R, Brown JM, Jayne DG. The impact of continuous versus intermittent vital signs monitoring in hospitals: A systematic review and narrative synthesis. Int J Nurs Stud 2018; 84:19-27. [PMID: 29729558 DOI: 10.1016/j.ijnurstu.2018.04.013] [Citation(s) in RCA: 82] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 04/17/2018] [Accepted: 04/17/2018] [Indexed: 11/17/2022]
Abstract
BACKGROUND Continuous vital signs monitoring on general hospital wards may allow earlier detection of patient deterioration and improve patient outcomes. This systematic review will assess if continuous monitoring is practical outside of the critical care setting, and whether it confers any clinical benefit to patients. METHODS MEDLINE®, MEDLINE® In-Process, EMBASE, CINAHL and The Cochrane Library were searched for articles that evaluated the clinical or non-clinical outcomes of continuous vital signs monitoring in adults outside of the critical care setting. The protocol was registered with PROSPERO (CRD42017058098). FINDINGS Twenty-four studies met the inclusion criteria and reported outcomes on a total of 40,274 patients and 59 ward staff in nine countries. The majority of studies showed benefits in terms of critical care use and length of hospital stay. Larger studies were more likely to demonstrate clinical benefit, particularly critical care use and length of hospital stay. Three studies showed cost-effectiveness. Barriers to implementation included nursing and patient satisfaction and the burden of false alerts. CONCLUSIONS Continuous vital signs monitoring outside the critical care setting is feasible and may provide a benefit in terms of improved patient outcomes and cost efficiency. Large, well-controlled studies in high-risk populations are required to evaluate the clinical benefit of continuous monitoring systems.
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Affiliation(s)
- C L Downey
- Leeds Institute of Biomedical & Clinical Sciences, Clinical Sciences Building, St. James's University Hospital, University of Leeds, Leeds, LS9 7TF, United Kingdom.
| | - S Chapman
- Leeds Institute of Biomedical & Clinical Sciences, Clinical Sciences Building, St. James's University Hospital, University of Leeds, Leeds, LS9 7TF, United Kingdom
| | - R Randell
- School of Healthcare, Baines Wing, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - J M Brown
- Leeds Institute of Clinical Trials Research, Worsley Building, University of Leeds, Leeds, LS2 9NL, United Kingdom
| | - D G Jayne
- Leeds Institute of Biomedical & Clinical Sciences, Clinical Sciences Building, St. James's University Hospital, University of Leeds, Leeds, LS9 7TF, United Kingdom
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Downey CL, Brown JM, Jayne DG, Randell R. Patient attitudes towards remote continuous vital signs monitoring on general surgery wards: An interview study. Int J Med Inform 2018; 114:52-56. [PMID: 29673603 DOI: 10.1016/j.ijmedinf.2018.03.014] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 12/07/2017] [Accepted: 03/23/2018] [Indexed: 11/16/2022]
Abstract
BACKGROUND Vital signs monitoring is used to identify deteriorating patients in hospital. The most common tool for vital signs monitoring is an early warning score, although emerging technologies allow for remote, continuous patient monitoring. A number of reviews have examined the impact of continuous monitoring on patient outcomes, but little is known about the patient experience. This study aims to discover what patients think of monitoring in hospital, with a particular emphasis on intermittent early warning scores versus remote continuous monitoring, in order to inform future implementations of continuous monitoring technology. METHODS Semi-structured interviews were undertaken with 12 surgical inpatients as part of a study testing a remote continuous monitoring device. All patients were monitored with both an early warning score and the new device. Interviews were audio-recorded, transcribed verbatim and analysed using thematic analysis. FINDINGS Patients can see the value in remote, continuous monitoring, particularly overnight. However, patients appreciate the face-to-face aspect of early warning score monitoring as it allows for reassurance, social interaction, and gives them further opportunity to ask questions about their medical care. CONCLUSION Early warning score systems are widely used to facilitate detection of the deteriorating patient. Continuous monitoring technologies may provide added reassurance. However, patients value personal contact with their healthcare professionals and remote monitoring should not replace this. We suggest that remote monitoring is best introduced in a phased manner, and initially as an adjunct to usual care, with careful consideration of the patient experience throughout.
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Affiliation(s)
- C L Downey
- Leeds Institute of Biomedical & Clinical Sciences, Clinical Sciences Building, St. James's University Hospital, University of Leeds, Leeds, LS9 7TF, United Kingdom.
| | - J M Brown
- Leeds Institute of Clinical Trials Research, Worsley Building, University of Leeds, Leeds, LS2 9NL, United Kingdom
| | - D G Jayne
- Leeds Institute of Biomedical & Clinical Sciences, Clinical Sciences Building, St. James's University Hospital, University of Leeds, Leeds, LS9 7TF, United Kingdom
| | - R Randell
- School of Healthcare, Baines Wing, University of Leeds, Leeds, LS2 9JT, United Kingdom
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Vidanapathirana AK, Thompson LC, Herco M, Odom J, Sumner SJ, Fennell TR, Brown JM, Wingard CJ. Acute intravenous exposure to silver nanoparticles during pregnancy induces particle size and vehicle dependent changes in vascular tissue contractility in Sprague Dawley rats. Reprod Toxicol 2018; 75:10-22. [PMID: 29154916 PMCID: PMC6241519 DOI: 10.1016/j.reprotox.2017.11.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 10/26/2017] [Accepted: 11/13/2017] [Indexed: 12/17/2022]
Abstract
The use of silver nanoparticles (AgNP) raises safety concerns during susceptible life stages such as pregnancy. We hypothesized that acute intravenous exposure to AgNP during late stages of pregnancy will increase vascular tissue contractility, potentially contributing to alterations in fetal growth. Sprague Dawley rats were exposed to a single dose of PVP or Citrate stabilized 20 or 110nm AgNP (700μg/kg). Differential vascular responses and EC50 values were observed in myographic studies in uterine, mesenteric arteries and thoracic aortic segments, 24h post-exposure. Reciprocal responses were observed in aortic and uterine vessels following PVP stabilized AgNP with an increased force of contraction in uterine artery and increased relaxation responses in aorta. Citrate stabilized AgNP exposure increased contractile force in both uterine and aortic vessels. Intravenous AgNP exposure during pregnancy displayed particle size and vehicle dependent moderate changes in vascular tissue contractility, potentially influencing fetal blood supply.
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Affiliation(s)
- A K Vidanapathirana
- Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - L C Thompson
- Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - M Herco
- Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - J Odom
- Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - S J Sumner
- Discovery Sciences, RTI International, Research Triangle Park, NC, 27709, USA; Department of Nutrition School of Public Health University of North Carolina at Chapel Hill, Kannapolis, NC, 28081, USA
| | - T R Fennell
- Discovery Sciences, RTI International, Research Triangle Park, NC, 27709, USA
| | - J M Brown
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado, CO, 80045, USA
| | - C J Wingard
- Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA; Department of Physical Therapy, Bellarmine University, Louisville, KY, 40205, USA.
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Abstract
A solid phase in the mixed water-carbon dioxide system, previously identified as carbonic acid, was observed in the high-pressure diamond-anvil cell. The pressure-temperature paths of both its melting and peritectic curves were measured, beginning at 4.4 GPa and 165 °C (where it exists in a quadruple equilibrium, together with an aqueous fluid and the ices H2O(VII) and CO2(I)) and proceeding to higher pressures and temperatures. Single-crystal X-ray diffraction revealed a triclinic crystal with unit cell parameters (at 6.5 GPa and 20 °C) of a = 5.88 Å, b = 6.59 Å, c = 6.99 Å, α = 88.7°, β = 79.7°, and γ = 67.7°. Raman spectra exhibit a major line at ~1080 cm−1 and lattice modes below 300 cm−1.
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Affiliation(s)
- E H Abramson
- Department of Earth and Space Sciences, University of Washington, Seattle, WA, 98195-1310, USA.
| | - O Bollengier
- Department of Earth and Space Sciences, University of Washington, Seattle, WA, 98195-1310, USA
| | - J M Brown
- Department of Earth and Space Sciences, University of Washington, Seattle, WA, 98195-1310, USA
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Affiliation(s)
- J M Brown
- Aneurin Bevan University Health Board , UK
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Brackley CA, Brown JM, Waithe D, Babbs C, Davies J, Hughes JR, Buckle VJ, Marenduzzo D. Predicting the three-dimensional folding of cis-regulatory regions in mammalian genomes using bioinformatic data and polymer models. Genome Biol 2016; 17:59. [PMID: 27036497 PMCID: PMC4815170 DOI: 10.1186/s13059-016-0909-0] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Accepted: 02/23/2016] [Indexed: 12/20/2022] Open
Abstract
The three-dimensional (3D) organization of chromosomes can be probed using methods like Capture-C. However, it is unclear how such population-level data relate to the organization within a single cell, and the mechanisms leading to the observed interactions are still largely obscure. We present a polymer modeling scheme based on the assumption that chromosome architecture is maintained by protein bridges, which form chromatin loops. To test the model, we perform FISH experiments and compare with Capture-C data. Starting merely from the locations of protein binding sites, our model accurately predicts the experimentally observed chromatin interactions, revealing a population of 3D conformations.
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Affiliation(s)
- Chris A. Brackley
- />SUPA, School of Physics and Astronomy, University of Edinburgh, Mayfield Road, Edinburgh, EH9 3JZ UK
| | - Jill M. Brown
- />MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS UK
| | - Dominic Waithe
- />Wolfson Imaging Centre Oxford, Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS UK
| | - Christian Babbs
- />MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS UK
| | - James Davies
- />MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS UK
| | - Jim R. Hughes
- />MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS UK
| | - Veronica J. Buckle
- />MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, Oxford University, Oxford, OX3 9DS UK
| | - Davide Marenduzzo
- />SUPA, School of Physics and Astronomy, University of Edinburgh, Mayfield Road, Edinburgh, EH9 3JZ UK
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Brown JM, Shanor C, Wright EM, Kolesik M. Carrier-wave shape effects in optical filamentation. Opt Lett 2016; 41:859-862. [PMID: 26974064 DOI: 10.1364/ol.41.000859] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Strong-field ionization in optical filaments created by ultrashort pulses with sub-cycle engineered waveforms is studied theoretically. To elucidate the physics of the recently demonstrated enhanced ionization yield and spatial control of the optical filament core in two color pulses, we employ two types of quantum models integrated into spatially resolved pulse-propagation simulations. We show that the dependence of the ionization on the shape of the excitation carrier is adiabatic in nature, and is driven by local temporal peaks of the electric field. Implications for the modeling of light-matter interactions in multicolor optical fields are also discussed.
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Glazer DI, Davenport MS, Khalatbari S, Cohan RH, Ellis JH, Caoili EM, Stein EB, Childress JC, Masch WR, Brown JM, Mollard BJ, Montgomery JS, Palapattu GS, Francis IR. Mass-like peripheral zone enhancement on CT is predictive of higher-grade (Gleason 4 + 3 and higher) prostate cancer. ACTA ACUST UNITED AC 2015; 40:560-70. [PMID: 25193787 DOI: 10.1007/s00261-014-0233-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE To determine whether focal peripheral zone enhancement on routine venous-phase CT is predictive of higher-grade (Gleason 4 + 3 and higher) prostate cancer. MATERIALS AND METHODS IRB approval was obtained and informed consent waived for this HIPAA-compliant retrospective study. Forty-three patients with higher-grade prostate cancer (≥Gleason 4 + 3) and 96 with histology-confirmed lower-grade (≤Gleason 3 + 4 [n = 47]) or absent (n = 49) prostate cancer imaged with venous-phase CT comprised the study population. CT images were reviewed by ten blinded radiologists (5 attendings, 5 residents) who scored peripheral zone enhancement on a scale of 1 (benign) to 5 (malignant). Mass-like peripheral zone enhancement was considered malignant. Likelihood ratios (LR) and specificities were calculated. Multivariate conditional logistic regression analyses were conducted. RESULTS Scores of "5" were strongly predictive of higher-grade prostate cancer (pooled LR+ 9.6 [95% CI 5.8-15.8]) with rare false positives (pooled specificity: 0.98 [942/960, 95% CI 0.98-0.99]; all 10 readers had specificity ≥95%). Attending scores of "5" were more predictive than resident scores of "5" (LR+: 14.7 [95% CI 5.8-37.2] vs. 7.6 [95% CI 4.2-13.7]) with similar specificity (0.99 [475/480, 95% CI 0.98-1.00] vs. 0.97 [467/480, 95% CI 0.96-0.99]). Significant predictors of an assigned score of "5" included presence of a peripheral zone mass (p < 0.0001), larger size (p < 0.0001), and less reader experience (p = 0.0008). Significant predictors of higher-grade prostate cancer included presence of a peripheral zone mass (p = 0.0002) and larger size (p < 0.0001). CONCLUSION Focal mass-like peripheral zone enhancement on routine venous-phase CT is specific and predictive of higher-grade (Gleason 4 + 3 and higher) prostate cancer.
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Affiliation(s)
- D I Glazer
- Department of Radiology, University of Michigan Health System, B2-A209P, Ann Arbor, MI, 48109, USA
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Bahl A, Brown JM, Wright EM, Kolesik M. Assessment of the metastable electronic state approach as a microscopically self-consistent description for the nonlinear response of atoms. Opt Lett 2015; 40:4987-4990. [PMID: 26512500 DOI: 10.1364/ol.40.004987] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This Letter presents the first quantitative assessment of the recently proposed metastable electronic state approach (MESA) for calculation of the nonlinear optical response of noble gas atoms. Based on the single active electron potentials for several atomic species, Stark resonant states are used to extract the nonlinear polarization and ionization rates free of any additional fitting parameters. It is shown that even the simplest version of the method provides a viable, first-principle-based, and self-consistent alternative to the standard model commonly used for simulations in the field of extreme nonlinear optics.
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36
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Brown JM, Price SJ, Price RA. Predicting risk after aneurysm surgery. Anaesthesia 2015; 70:1320. [PMID: 26449294 DOI: 10.1111/anae.13241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - R A Price
- Royal Devon and Exeter NHS Foundation Trust, Exeter, UK
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37
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Holland NA, Becak DP, Shannahan JH, Brown JM, Carratt SA, Winkle L, Pinkerton KE, Wang CM, Munusamy P, Baer DR, Sumner SJ, Fennell TR, Lust RM, Wingard CJ. Cardiac Ischemia Reperfusion Injury Following Instillation of 20 nm Citrate-capped Nanosilver. ACTA ACUST UNITED AC 2015; 6. [PMID: 26966636 DOI: 10.4172/2157-7439.s6-006] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND Silver nanoparticles (AgNP) have garnered much interest due to their antimicrobial properties, becoming one of the most utilized nano-scale materials. However, any potential evocable cardiovascular injury associated with exposure has not been reported to date. We have previously demonstrated expansion of myocardial infarction after intratracheal (IT) instillation of carbon-based nanomaterials. We hypothesized pulmonary exposure to Ag core AgNP induces a measureable increase in circulating cytokines, expansion of cardiac ischemia-reperfusion (I/R) injury and is associated with depressed coronary constrictor and relaxation responses. Secondarily, we addressed the potential contribution of silver ion release on AgNP toxicity. METHODS Male Sprague-Dawley rats were exposed to 200 μl of 1 mg/ml of 20 nm citrate-capped Ag core AgNP, 0.01, 0.1, 1 mg/ml Silver Acetate (AgAc), or a citrate vehicle by intratracheal (IT) instillation. One and 7 days following IT instillation the lungs were evaluated for inflammation and the presence of silver; serum was analyzed for concentrations of selected cytokines; cardiac I/R injury and coronary artery reactivity were assessed. RESULTS AgNP instillation resulted in modest pulmonary inflammation with detection of silver in lung tissue and alveolar macrophages, elevation of serum cytokines: G-CSF, MIP-1α, IL-1β, IL-2, IL-6, IL-13, IL-10, IL-18, IL-17α, TNFα, and RANTES, expansion of I/R injury and depression of the coronary vessel reactivity at 1 day post IT compared to vehicle treated rats. Silver within lung tissue was persistent at 7 days post IT instillation and was associated with an elevation in cytokines: IL-2, IL-13, and TNFα and expansion of I/R injury. AgAc resulted in a concentration dependent infarct expansion and depressed vascular reactivity without marked pulmonary inflammation or serum cytokine response. CONCLUSIONS Based on these data, IT instillation of AgNP increases circulating levels of several key cytokines, which may contribute to persistent expansion of I/R injury possibly through an impaired vascular responsiveness.
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Affiliation(s)
- N A Holland
- Department of Physiology, Brody School of Medicine at East Carolina University, Greenville, North Carolina, USA
| | - D P Becak
- Department of Physiology, Brody School of Medicine at East Carolina University, Greenville, North Carolina, USA
| | - Jonathan H Shannahan
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, The University of Colorado Anschutz Medical Campus, Aurora, USA
| | - J M Brown
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, The University of Colorado Anschutz Medical Campus, Aurora, USA
| | - S A Carratt
- Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California at Davis, Davis, California, USA
| | - Lsv Winkle
- Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California at Davis, Davis, California, USA
| | - K E Pinkerton
- Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California at Davis, Davis, California, USA
| | - C M Wang
- Pacific Northwest National Laboratory, EMSL, Richland, USA
| | - P Munusamy
- Pacific Northwest National Laboratory, EMSL, Richland, USA
| | - Don R Baer
- Pacific Northwest National Laboratory, EMSL, Richland, USA
| | - S J Sumner
- RTI International, Discovery Sciences, Research Triangle Park, USA
| | - T R Fennell
- RTI International, Discovery Sciences, Research Triangle Park, USA
| | - R M Lust
- Department of Physiology, Brody School of Medicine at East Carolina University, Greenville, North Carolina, USA
| | - C J Wingard
- Department of Physiology, Brody School of Medicine at East Carolina University, Greenville, North Carolina, USA
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Silva AM, Brown JM, Buckle VJ, Wade-Martins R, Lufino MMP. Expanded GAA repeats impair FXN gene expression and reposition the FXN locus to the nuclear lamina in single cells. Hum Mol Genet 2015; 24:3457-71. [PMID: 25814655 PMCID: PMC4498154 DOI: 10.1093/hmg/ddv096] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Accepted: 03/12/2015] [Indexed: 02/07/2023] Open
Abstract
Abnormally expanded DNA repeats are associated with several neurodegenerative diseases. In Friedreich's ataxia (FRDA), expanded GAA repeats in intron 1 of the frataxin gene (FXN) reduce FXN mRNA levels in averaged cell samples through a poorly understood mechanism. By visualizing FXN expression and nuclear localization in single cells, we show that GAA-expanded repeats decrease the number of FXN mRNA molecules, slow transcription, and increase FXN localization at the nuclear lamina (NL). Restoring histone acetylation reverses NL positioning. Expanded GAA-FXN loci in FRDA patient cells show increased NL localization with increased silencing of alleles and reduced transcription from alleles positioned peripherally. We also demonstrate inefficiencies in transcription initiation and elongation from the expanded GAA-FXN locus at single-cell resolution. We suggest that repressive epigenetic modifications at the expanded GAA-FXN locus may lead to NL relocation, where further repression may occur.
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Affiliation(s)
- Ana M Silva
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3QX, UK, Faculdade de Medicina, Universidade de Lisboa, Lisboa 1649-028, Portugal and
| | - Jill M Brown
- Medical Research Council, Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, UK
| | - Veronica J Buckle
- Medical Research Council, Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, Oxford OX3 9DS, UK
| | - Richard Wade-Martins
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3QX, UK,
| | - Michele M P Lufino
- Department of Physiology, Anatomy and Genetics, University of Oxford, Oxford OX1 3QX, UK,
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Viale E, Martinez-Sañudo I, Brown JM, Simonato M, Girolami V, Squartini A, Bressan A, Faccoli M, Mazzon L. Pattern of association between endemic Hawaiian fruit flies (Diptera, Tephritidae) and their symbiotic bacteria: Evidence of cospeciation events and proposal of "Candidatus Stammerula trupaneae". Mol Phylogenet Evol 2015; 90:67-79. [PMID: 25959751 DOI: 10.1016/j.ympev.2015.04.025] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 04/18/2015] [Accepted: 04/28/2015] [Indexed: 11/18/2022]
Abstract
Several insect lineages have evolved mutualistic association with symbiotic bacteria. This is the case of some species of mealybugs, whiteflies, weevils, tsetse flies, cockroaches, termites, carpenter ants, aphids and fruit flies. Some species of Tephritinae, the most specialized subfamily of fruit flies (Diptera: Tephritidae), harbour co-evolved vertically transmitted, bacterial symbionts in their midgut, known as "Candidatus Stammerula spp.". The 25 described endemic species of Hawaiian tephritids, plus at least three undescribed species, are taxonomically distributed among three genera: the cosmopolitan genus Trupanea (21 described spp.), the endemic genus Phaeogramma (2 spp.) and the Nearctic genus Neotephritis (2 spp.). We examined the presence of symbiotic bacteria in the endemic tephritids of the Hawaiian Islands, which represent a spectacular example of adaptive radiation, and tested the concordant evolution between host and symbiont phylogenies. We detected through PCR assays the presence of specific symbiotic bacteria, designated as "Candidatus Stammerula trupaneae", from 35 individuals of 15 species. The phylogeny of the insect host was reconstructed based on two regions of the mitochondrial DNA (16S rDNA and COI-tRNALeu-COII), while the bacterial 16S rRNA was used for the symbiont analysis. Host and symbiont phylogenies were then compared and evaluated for patterns of cophylogeny and strict cospeciation. Topological congruence between Hawaiian Tephritinae and their symbiotic bacteria phylogenies suggests a limited, but significant degree of host-symbiont cospeciation. We also explored the character reconstruction of three host traits, as island location, host lineage, and host tissue attacked, based on the symbiont phylogenies under the hypothesis of cospeciation.
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Affiliation(s)
- E Viale
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova - Agripolis, Viale dell'Università, 16, 35020 Legnaro, Padova, Italy.
| | - I Martinez-Sañudo
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova - Agripolis, Viale dell'Università, 16, 35020 Legnaro, Padova, Italy.
| | - J M Brown
- Department of Biology, Grinnell College, Grinnell, IA 50012, USA.
| | - M Simonato
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova - Agripolis, Viale dell'Università, 16, 35020 Legnaro, Padova, Italy.
| | - V Girolami
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova - Agripolis, Viale dell'Università, 16, 35020 Legnaro, Padova, Italy
| | - A Squartini
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova - Agripolis, Viale dell'Università, 16, 35020 Legnaro, Padova, Italy.
| | - A Bressan
- Bayer Crop Science LP, R&D Trait Research, 3500 Paramount Parkway, Morrisville, NC 27560, USA.
| | - M Faccoli
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova - Agripolis, Viale dell'Università, 16, 35020 Legnaro, Padova, Italy.
| | - L Mazzon
- Department of Agronomy, Food, Natural Resources, Animals and Environment (DAFNAE), University of Padova - Agripolis, Viale dell'Università, 16, 35020 Legnaro, Padova, Italy.
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Ordidge KL, Brown JM, Succony L, Navani N, Hardavella G, Lawrence DR, Fraioli F, Groves A, Janes SM. Massive pulmonary carcinoid tumor deemed inoperable until (68)Ga DOTATATE positron emission tomography/magnetic resonance imaging. Am J Respir Crit Care Med 2014; 190:e16-7. [PMID: 25171317 DOI: 10.1164/rccm.201309-1635im] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- K L Ordidge
- 1 Lungs for Living Research Centre, UCL Respiratory, Division of Medicine, Rayne Building, University College London, London, United Kingdom
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Schneider CM, Repka CP, Brown JM, Lalonde TL, Dallow KT, Barlow CE, Hayward R. Demonstration of the need for cardiovascular and pulmonary normative data for cancer survivors. Int J Sports Med 2014; 35:1134-7. [PMID: 24995960 DOI: 10.1055/s-0034-1375691] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Despite evidence that cancer and its treatments severely reduce cardiorespiratory fitness (CRF), normative data for cancer survivors do not exist. The present study identifies age and gender-specific CRF distributions in a cancer population. The use of cancer-specific normative CRF data may help stratify initial fitness status and assess improvements in response to exercise interventions in cancer survivors. Data from 703 cancer survivors were analyzed for this study. Quintiles were compiled for peak oxygen consumption (VO2peak), forced vital capacity (FVC), and forced expiratory volume (FEV1) for males and females in 5 age groups (19-39, 40-49, 50-59, 60-69, and ≥70 years of age). VO2peak values for the cancer population were significantly lower than the general US population. The cancer population average in each age group fell within the "very poor" classification of VO2peak values for the general population. FVC values in the cancer population were similar to the general population. Cancer survivors had very low age group-specific VO2peak values compared to the apparently healthy general US population. Previously, CRF values of cancer survivors were compared to normative values for the apparently healthy general population, which yielded imprecise classifications of initial fitness and changes in fitness, resulting in patient discouragement.
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Affiliation(s)
- C M Schneider
- Rocky Mountain Cancer Rehabilitation Institute, University of Northern Colorado, Greeley, United States
| | - C P Repka
- Rocky Mountain Cancer Rehabilitation Institute, University of Northern Colorado, Greeley, United States
| | - J M Brown
- Rocky Mountain Cancer Rehabilitation Institute, University of Northern Colorado, Greeley, United States
| | - T L Lalonde
- Department of Applied Statistics and Research Methods, University of Northern Colorado, Greeley, United States
| | - K T Dallow
- Family Medicine, North Colorado Medical Center, Greeley, United States
| | - C E Barlow
- Research Department, The Cooper Institute, Dallas, United States
| | - R Hayward
- Rocky Mountain Cancer Rehabilitation Institute, University of Northern Colorado, Greeley, United States
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42
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Abstract
Tumours have two main ways to develop a vasculature: by angiogenesis, the sprouting of endothelial cells from nearby blood vessels, and vasculogenesis, the formation of blood vessels from circulating cells. Because tumour irradiation abrogates local angiogenesis, the tumour must rely on the vasculogenesis pathway for regrowth after irradiation. Tumour irradiation produces a marked influx of CD11b(+) myeloid cells (macrophages) into the tumours, and these are crucial to the formation of blood vessels in the tumours after irradiation and for the recurrence of the tumours. This process is driven by increased tumour hypoxia, which increases levels of HIF-1 (hypoxia-inducible factor 1), which in turn upregulates SDF-1 (stromal cell-derived factor 1 or CXCL12), the main driver of the vasculogenesis pathway. Inhibition of HIF-1 or of its downstream target SDF-1 prevents the radiation-induced influx of the CD11b(+) myeloid cells and delays or prevents the tumours from recurring following irradiation. Others and we have shown that with a variety of tumours in both mice and rats, the inhibition of the SDF-1/CXCR4 pathway delays or prevents the recurrence of implanted or autochthonous tumours following irradiation or following treatment with vascular disrupting agents or some chemotherapeutic drugs such as paclitaxel. In addition to the recruited macrophages, endothelial progenitor cells (EPCs) are also recruited to the irradiated tumours, a process also driven by SDF-1. Together, the recruited proangiogenic macrophages and the EPCs reform the tumour vasculature and allow the tumour to regrow following irradiation. This is a new paradigm with major implications for the treatment of solid tumours by radiotherapy.
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Affiliation(s)
- J M Brown
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University, Stanford, CA, USA
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43
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Vidanapathirana AK, Thompson LC, Odom J, Holland NA, Sumner SJ, Fennell TR, Brown JM, Wingard CJ. Vascular Tissue Contractility Changes Following Late Gestational Exposure to Multi-Walled Carbon Nanotubes or their Dispersing Vehicle in Sprague Dawley Rats. ACTA ACUST UNITED AC 2014; 5. [PMID: 27066300 DOI: 10.4172/2157-7439.1000201] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Multi-walled carbon nanotubes (MWCNTs) are increasingly used in industry and in nanomedicine raising safety concerns, especially during unique life-stages such as pregnancy. We hypothesized that MWCNT exposure during pregnancy will increase vascular tissue contractile responses by increasing Rho kinase signaling. Pregnant (17-19 gestational days) and non-pregnant Sprague Dawley rats were exposed to 100 μg/kg of MWCNTs by intratracheal instillation or intravenous administration. Vasoactive responses of uterine, mesenteric, aortic and umbilical vessels were studied 24 hours post-exposure by wire myography. The contractile responses of the vessel segments were different between the pregnant and non-pregnant rats, following MWCNT exposure. Maximum stress generation in the uterine artery segments from the pregnant rats following pulmonary MWCNT exposure was increased in response to angiotensin II by 4.9 mN/mm2 (+118%), as compared to the naïve response and by 2.6 mN/mm2 (+40.7%) as compared to the vehicle exposed group. Following MWCNT exposure, serotonin induced approximately 4 mN/mm2 increase in stress generation of the mesenteric artery from both pregnant and non-pregnant rats as compared to the vehicle response. A significant contribution of the dispersion medium was identified as inducing changes in the contractile properties following both pulmonary and intravenous exposure to MWCNTs. Wire myographic studies in the presence of a Rho kinase inhibitor and RhoA and Rho kinase mRNA/protein expression of rat aortic endothelial cells were unaltered following exposure to MWCNTs, suggesting absent/minimal contribution of Rho kinase to the enhanced contractile responses following MWCNT exposure. The reactivity of the umbilical vein was not changed; however, mean fetal weight gain was reduced with dispersion media and MWCNT exposure by both routes. These results suggest a susceptibility of the vasculature during gestation to MWCNT and their dispersion media-induced vasoconstriction, predisposing reduced fetal growth during pregnancy.
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Affiliation(s)
- A K Vidanapathirana
- Department of Physiology, Brody School of Medicine, East Carolina University, NC 27834, USA
| | - L C Thompson
- Department of Physiology, Brody School of Medicine, East Carolina University, NC 27834, USA
| | - J Odom
- Department of Physiology, Brody School of Medicine, East Carolina University, NC 27834, USA
| | - N A Holland
- Department of Physiology, Brody School of Medicine, East Carolina University, NC 27834, USA
| | - S J Sumner
- Discovery Sciences, RTI International, Research Triangle Park, NC, 27709, USA
| | - T R Fennell
- Discovery Sciences, RTI International, Research Triangle Park, NC, 27709, USA
| | - J M Brown
- Department of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of Colorado, CO, 80045, USA
| | - C J Wingard
- Department of Physiology, Brody School of Medicine, East Carolina University, NC 27834, USA
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44
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Walters MJ, Ebsworth K, Berahovich RD, Penfold MET, Liu SC, Al Omran R, Kioi M, Chernikova SB, Tseng D, Mulkearns-Hubert EE, Sinyuk M, Ransohoff RM, Lathia JD, Karamchandani J, Kohrt HEK, Zhang P, Powers JP, Jaen JC, Schall TJ, Merchant M, Recht L, Brown JM. Inhibition of CXCR7 extends survival following irradiation of brain tumours in mice and rats. Br J Cancer 2014; 110:1179-88. [PMID: 24423923 PMCID: PMC3950859 DOI: 10.1038/bjc.2013.830] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Revised: 12/12/2013] [Accepted: 12/18/2013] [Indexed: 12/26/2022] Open
Abstract
Background: In experimental models of glioblastoma multiforme (GBM), irradiation (IR) induces local expression of the chemokine CXCL12/SDF-1, which promotes tumour recurrence. The role of CXCR7, the high-affinity receptor for CXCL12, in the tumour's response to IR has not been addressed. Methods: We tested CXCR7 inhibitors for their effects on tumour growth and/or animal survival post IR in three rodent GBM models. We used immunohistochemistry to determine where CXCR7 protein is expressed in the tumours and in human GBM samples. We used neurosphere formation assays with human GBM xenografts to determine whether CXCR7 is required for cancer stem cell (CSC) activity in vitro. Results: CXCR7 was detected on tumour cells and/or tumour-associated vasculature in the rodent models and in human GBM. In human GBM, CXCR7 expression increased with glioma grade and was spatially associated with CXCL12 and CXCL11/I-TAC. In the rodent GBM models, pharmacological inhibition of CXCR7 post IR caused tumour regression, blocked tumour recurrence, and/or substantially prolonged survival. CXCR7 expression levels on human GBM xenograft cells correlated with neurosphere-forming activity, and a CXCR7 inhibitor blocked sphere formation by sorted CSCs. Conclusions: These results indicate that CXCR7 inhibitors could block GBM tumour recurrence after IR, perhaps by interfering with CSCs.
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Affiliation(s)
- M J Walters
- ChemoCentryx Inc., 850 Maude Ave, Mountain View, CA 94043, USA
| | - K Ebsworth
- ChemoCentryx Inc., 850 Maude Ave, Mountain View, CA 94043, USA
| | - R D Berahovich
- ChemoCentryx Inc., 850 Maude Ave, Mountain View, CA 94043, USA
| | - M E T Penfold
- ChemoCentryx Inc., 850 Maude Ave, Mountain View, CA 94043, USA
| | - S-C Liu
- Department of Radiation Oncology, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA
| | - R Al Omran
- Department of Radiation Oncology, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA
| | - M Kioi
- Department of Radiation Oncology, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA
| | - S B Chernikova
- Department of Radiation Oncology, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA
| | - D Tseng
- Department of Radiation Oncology, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA
| | - E E Mulkearns-Hubert
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - M Sinyuk
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - R M Ransohoff
- 1] Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA [2] Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH, USA
| | - J D Lathia
- 1] Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA [2] Department of Molecular Medicine, Cleveland Clinic Lerner College of Medicine, Case Western Reserve University, Cleveland, OH, USA
| | - J Karamchandani
- Department of Pathology, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA
| | - H E K Kohrt
- Department of Medicine, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA
| | - P Zhang
- ChemoCentryx Inc., 850 Maude Ave, Mountain View, CA 94043, USA
| | - J P Powers
- ChemoCentryx Inc., 850 Maude Ave, Mountain View, CA 94043, USA
| | - J C Jaen
- ChemoCentryx Inc., 850 Maude Ave, Mountain View, CA 94043, USA
| | - T J Schall
- ChemoCentryx Inc., 850 Maude Ave, Mountain View, CA 94043, USA
| | - M Merchant
- Department of Neurology, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA
| | - L Recht
- Department of Neurology, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA
| | - J M Brown
- Department of Radiation Oncology, Stanford University, 300 Pasteur Drive, Stanford, CA 94305, USA
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45
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Brown JM, Hardavella G, Carroll B, Falzon M, Navani N, George PJ, Janes SM. S129 The natural history of bronchial pre-invasive disease. Thorax 2013. [DOI: 10.1136/thoraxjnl-2013-204457.136] [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: 11/04/2022]
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46
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Alexander SK, Brown JM, Graham A, Nestor PJ. CADASIL presenting with a behavioural variant frontotemporal dementia phenotype. J Clin Neurosci 2013; 21:165-7. [PMID: 24035425 DOI: 10.1016/j.jocn.2013.02.025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [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: 01/29/2013] [Accepted: 02/02/2013] [Indexed: 10/26/2022]
Abstract
The behavioural variant of frontotemporal dementia (bvFTD) is characterised by personality change with a decline in cognition. We describe two patients with cerebral autosomal dominant arteriopathy with subcortical infarcts and leukencephalopathy (CADASIL) who presented with behavioural phenotypes similar to bvFTD. The first patient presented with progressive personality and behavioural change, had florid white matter hyperintensity, and had a novel missense mutation C366W in exon 7 of the Notch3 gene. The second patient presented with progressive memory impairment and marked personality changes after a transient ischaemic attack. In this second patient, the radiological features were subtle and only the family history of stroke prompted testing for CADASIL using Notch3 genotyping. We present these patients to demonstrate that CADASIL may mimic bvFTD, with little clinical or radiological evidence to distinguish the two. CADASIL may be an under-recognised diagnosis in apparent bvFTD. Screening Notch3 in a substantial and unselected cohort of frontotemporal dementia patients might be appropriate to investigate this possibility.
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Affiliation(s)
- S K Alexander
- Department of Clinical Neurosciences, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, UK.
| | - J M Brown
- Department of Clinical Neurosciences, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, UK
| | - A Graham
- Department of Clinical Neurosciences, Addenbrooke's Hospital, Hills Road, Cambridge CB2 0QQ, UK
| | - P J Nestor
- German Center for Neurodegenerative diseases (DZNE), Magdeburg, Germany
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47
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Babbs C, Roberts NA, Sanchez-Pulido L, McGowan SJ, Ahmed MR, Brown JM, Sabry MA, Bentley DR, McVean GA, Donnelly P, Gileadi O, Ponting CP, Higgs DR, Buckle VJ. Homozygous mutations in a predicted endonuclease are a novel cause of congenital dyserythropoietic anemia type I. Haematologica 2013; 98:1383-7. [PMID: 23716552 DOI: 10.3324/haematol.2013.089490] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The congenital dyserythropoietic anemias are a heterogeneous group of rare disorders primarily affecting erythropoiesis with characteristic morphological abnormalities and a block in erythroid maturation. Mutations in the CDAN1 gene, which encodes Codanin-1, underlie the majority of congenital dyserythropoietic anemia type I cases. However, no likely pathogenic CDAN1 mutation has been detected in approximately 20% of cases, suggesting the presence of at least one other locus. We used whole genome sequencing and segregation analysis to identify a homozygous T to A transversion (c.533T>A), predicted to lead to a p.L178Q missense substitution in C15ORF41, a gene of unknown function, in a consanguineous pedigree of Middle-Eastern origin. Sequencing C15ORF41 in other CDAN1 mutation-negative congenital dyserythropoietic anemia type I pedigrees identified a homozygous transition (c.281A>G), predicted to lead to a p.Y94C substitution, in two further pedigrees of SouthEast Asian origin. The haplotype surrounding the c.281A>G change suggests a founder effect for this mutation in Pakistan. Detailed sequence similarity searches indicate that C15ORF41 encodes a novel restriction endonuclease that is a member of the Holliday junction resolvase family of proteins.
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Affiliation(s)
- Christian Babbs
- Molecular Haematology Unit, MRC Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
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48
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Cai Q, Yarandi SS, Kung RD, Brown JM, Xu H, Cai Q. Effect of oral fluticasone on refractory peptic esophageal stricture--a new therapeutic method. Endoscopy 2013; 44 Suppl 2 UCTN:E408-9. [PMID: 23169039 DOI: 10.1055/s-0032-1310257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Affiliation(s)
- Q Cai
- Division of Digestive Diseases, Emory University School of Medicine, Atlanta, Georgia, USA.
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49
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McDaniel AL, Temel RE, Brown JM, Lee RG, Graham MJ, Crooke RM. Abstract 106: Transintestinal Cholesterol Excretion and Macrophage Reverse Cholesterol Transport are not Stimulated in Hepatic ABCG8 Knockdown Mice Treated with an LXR Agonist. Arterioscler Thromb Vasc Biol 2013. [DOI: 10.1161/atvb.33.suppl_1.a106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Transintestinal cholesterol excretion (TICE) is a recently discovered pathway by which cholesterol travels from plasma to the small intestine for direct excretion into the feces. Hallmarks of animal models with TICE include severely diminished biliary cholesterol secretion but near normal levels of hepatic cholesterol and fecal neutral sterol excretion. Using an ATP binding cassette transporter G8 (ABCG8) antisense oligonucleotide (ASO) to knock down ABCG8 specifically in liver (G8
HKD
), we created a novel mouse model with significantly decreased biliary cholesterol excretion but a 658% increase in hepatic cholesterol accumulation and a 78% reduction in fecal neutral sterol excretion, indicating a dysfunction in the TICE pathway. LXR agonists have previously been shown to stimulate the TICE pathway. In order to more definitively prove the TICE pathway was disfunctional in G8
HKD
mice, we treated wild type (WT) and G8
HKD
mice with the LXR agonist T0901317 and measured markers of TICE stimulation. As expected, in WT mice, T0901317 doubled biliary cholesterol concentrations. A similar effect was seen in G8
HKD
mice treated with T0901317, but biliary cholesterol concentrations remained significantly less than their WT counterparts. These levels of biliary cholesterol closely mirrored hepatic ABCG8 mRNA expression. T0901317 stimulated fecal neutral sterol excretion by >1000% in wild type mice but only by 190% in G8
HKD
mice. These data indicate that TICE is disfunctional in G8
HDK
mice since the pathway was not stimulated to the same extent in WT and G8
HKD
mice by an LXR agonist. Some controversy remains over whether the TICE pathway transports macrophage derived cholesterol. In order to address this issue, we performed a macrophage RCT assay on WT and TICE disfunctional G8
HKD
mice. T0901317 stimulated macrophage RCT (fecal neutral sterol 3H dpm) by >2300% in wild type mice but only by 370% in G8
HKD
mice. T0901317 increased fecal acidic sterol 3H count by 65-75% in both wild type and G8
HKD
mice. These results indicate that macrophage RCT is impaired when the TICE pathway is decreased. In sum, our data shows that hepatic ABCG8 plays a key role in the TICE pathway and that impairing the TICE pathway through hepatic ABCG8 knockdown causes decreased macrophage RCT.
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Affiliation(s)
- Allison L McDaniel
- Dept of Pathology - Section on Lipid Sciences, Wake Forest Univ Sch of Medicine, Winston Salem, NC
| | - Ryan E Temel
- Dept of Pathology - Section on Lipid Sciences, Wake Forest Univ Sch of Medicine, Winston Salem, NC
| | - J M Brown
- Dept of Pathology - Section on Lipid Sciences, Wake Forest Univ Sch of Medicine, Winston Salem, NC
| | - Richard G Lee
- Cardiovascular Group, Antisense Drug Discovery, Isis Pharmaceuticals, Inc., Carlsbad, CA
| | - Mark J Graham
- Cardiovascular Group, Antisense Drug Discovery, Isis Pharmaceuticals, Inc., Carlsbad, CA
| | - Roseanne M Crooke
- Cardiovascular Group, Antisense Drug Discovery, Isis Pharmaceuticals, Inc., Carlsbad, CA
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50
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Marshall SM, Wilson MD, Kelley KL, Lee RG, Crooke RM, Graham MJ, Rudel LL, Brown JM, Temel RE. Abstract 396: Acute Hepatic ACAT2 Knockdown Transiently Increases Plasma and Hepatic Free Cholesterol and Fecal Neutral Sterol Excretion. Arterioscler Thromb Vasc Biol 2013. [DOI: 10.1161/atvb.33.suppl_1.a396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In spite of the advent of statins, atherosclerotic coronary vascular disease (ASCVD) remains the number one killer of Americans. A way to reduce LDL cholesterol, the primary risk factor of ASCVD, is to increase cholesterol excretion from the body. Our group and others have recently found that cholesterol excretion can be facilitated by both biliary and non-biliary pathways. The lipoprotein that delivers cholesterol from the liver through the plasma to the small intestine for transintestinal cholesterol excretion (TICE) is not yet known. We have previously shown that chronic knockdown in mice of hepatic acyl-CoA cholesterol acyltransferase 2 (ACAT2), a cellular enzyme that converts free cholesterol (FC) into cholesteryl ester (CE), appeared to cause the formation of hepatic apoB-containing lipoproteins that preferentially trafficked cholesterol to the small intestine for TICE. We tested the hypothesis that the plasma concentration of TICE-competent, apoB-containing lipoproteins, could be increased by preloading the liver with cholesterol and then acutely depleting the cholesterol by knocking down hepatic ACAT2 with antisense oligonucleotides (ASO). After feeding a high cholesterol (0.2% wt/wt) diet for six weeks, C57BL/6 mice were treated with control non-targeting ASO or ACAT2 ASO for one or two weeks. After only one week of ACAT2 knockdown (ACAT2KD) hepatic ACAT2 protein expression was decreased nearly 80%. This translated into a 50% decrease in hepatic CE concentration in conjunction with a rarely seen 2-fold increase in hepatic FC concentration. Acute hepatic ACAT2KD increased plasma FC levels by 25%, which subsided after two weeks of treatment. The increased plasma FC was primarily associated with large and small LDL. After one week of hepatic ACAT2KD mice had a minor, non-significant increase in biliary cholesterol levels but had a 2-fold increase in fecal neutral sterol (FNS) excretion. In summary our data show that when CE is rapidly cleared from the liver, FNS levels dramatically increase with a transient increase in hepatic and plasma FC levels. We believe that in the ACAT2KD mice the increased plasma FC associated with LDL is feeding into TICE thus resulting in increased FNS.
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Affiliation(s)
| | - Martha D Wilson
- Lipid Sciences, Wake Forest Univ Sch of Medicine, Winston Salem, NC
| | - Kathryn L Kelley
- Lipid Sciences, Wake Forest Univ Sch of Medicine, Winston Salem, NC
| | - Richard G Lee
- Antisense Drug Discovery, Isis Pharmaceuticals, Carlsbad, CA
| | | | - Mark J Graham
- Antisense Drug Discovery, Isis Pharmaceuticals, Carlsbad, CA
| | - Lawrence L Rudel
- Lipid Sciences, Wake Forest Univ Sch of Medicine, Winston Salem, NC
| | - J M Brown
- Lipid Sciences, Wake Forest Univ Sch of Medicine, Winston Salem, NC
| | - Ryan E Temel
- Lipid Sciences, Wake Forest Univ Sch of Medicine, Winston Salem, NC
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