2551
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Babughirana G, Gerards S, Mokori A, Nangosha E, Kremers S, Gubbels J. Maternal and newborn healthcare practices: assessment of the uptake of lifesaving services in Hoima District, Uganda. BMC Pregnancy Childbirth 2020; 20:686. [PMID: 33176734 PMCID: PMC7659084 DOI: 10.1186/s12884-020-03385-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 10/30/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The current maternal mortality ratio in Uganda is 336 maternal deaths per 100,000 live births. Infant mortality is 43 deaths per 1000 live births, with 42% of the mortality occurring during the neonatal period. This might be related to a weak health system in the country. This study aimed at assessing the uptake of lifesaving services during pregnancy and childbirth in Hoima District, Uganda. METHODS The study used a cross-sectional quantitative design among 691 women with a child under 5 years. Households were randomly sampled from a list of all the villages in the district with the ENA for SMART software using the EPI methodology. Pre-coded questionnaires uploaded in the Open Data Kit were used for data collection. The data was cleaned and analysed using MS Excel and SPSS software. Descriptive results are presented. RESULTS Of the 55.1% women attending at least four antenatal care (ANC) visits, only 24.3% had the first ANC within the first trimester. Moreover, ANC services generally was of poor quality, with only 0.4% meeting all the requirements for quality of ANC service. The highest contributors to this poor quality included poor uptake of iron-folic acid (adherence 28.8%), the six-required birth preparedness and complication readiness items (13.2%), and recognition of the seven danger signs of pregnancy (3.0%). Adherence to the seven essential newborn care actions was very low (0.5%), mainly caused by three practices: initiating breastfeeding within 1 h (59.9%), lack of postnatal care within 24 h (20.1%), and failure to recognize the 6 danger signs of the newborn (2.4%). Only 11.1% of the males participated in all maternal and newborn care requirements, by encouraging women to seek healthcare (39.9%), accompanying them to healthcare (36.9%), and HIV counselling and support services (26.2%). CONCLUSION The study reveals poor maternal and newborn practices throughout the continuum of care, from ANC and skilled birth attendance to newborn care during childbirth. With such poor results, it is not surprising that Hoima is sixth of 10 districts that have the highest numbers of deaths due to maternal mortality in Uganda.
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Affiliation(s)
- Geoffrey Babughirana
- NUTRIM School of Nutrition and Translational Research in Metabolism, Department of Health Promotion, Maastricht University, Maastricht, the Netherlands.
| | - Sanne Gerards
- NUTRIM School of Nutrition and Translational Research in Metabolism, Department of Health Promotion, Maastricht University, Maastricht, the Netherlands
| | | | | | - Stef Kremers
- NUTRIM School of Nutrition and Translational Research in Metabolism, Department of Health Promotion, Maastricht University, Maastricht, the Netherlands
| | - Jessica Gubbels
- NUTRIM School of Nutrition and Translational Research in Metabolism, Department of Health Promotion, Maastricht University, Maastricht, the Netherlands
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2552
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Steinbauer P, Rohatschek A, Andriotis O, Bouropoulos N, Liska R, Thurner PJ, Baudis S. Single-Molecule Force Spectroscopy Reveals Adhesion-by-Demand in Statherin at the Protein-Hydroxyapatite Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:13292-13300. [PMID: 33118809 PMCID: PMC7660943 DOI: 10.1021/acs.langmuir.0c02325] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 10/09/2020] [Indexed: 06/11/2023]
Abstract
Achieving strong adhesion in wet environments remains a technological challenge in biomedical applications demanding biocompatibility. Attention for adhesive motifs meeting such demands has largely been focused on marine organisms. However, bioadhesion to inorganic surfaces is also present in the human body, in the hard tissues of teeth and bones, and is mediated through serines (S). The specific amino acid sequence DpSpSEEKC has been previously suggested to be responsible for the strong binding abilities of the protein statherin to hydroxyapatite, where pS denotes phosphorylated serine. Notably, similar sequences are present in the non-collagenous bone protein osteopontin (OPN) and the mussel foot protein 5 (Mefp5). OPN has previously been shown to promote fracture toughness and physiological damage formation. Here, we investigated the adhesion strength of the motif D(pS)(pS)EEKC on substrates of hydroxyapatite, TiO2, and mica using atomic force microscopy (AFM) single-molecule force spectroscopy (SMFS). Specifically, we investigated the dependence of adhesion force on phosphorylation of serines by comparing findings with the unphosphorylated variant DSSEEKC. Our results show that high adhesion forces of over 1 nN on hydroxyapatite and on TiO2 are only present for the phosphorylated variant D(pS)(pS)EEKC. This warrants further exploitation of this motif or similar residues in technological applications. Further, the dependence of adhesion force on phosphorylation suggests that biological systems potentially employ an adhesion-by-demand mechanism via expression of enzymes that up- or down-regulate phosphorylation, to increase or decrease adhesion forces, respectively.
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Affiliation(s)
- Patrick Steinbauer
- Christian
Doppler Laboratory for Advanced Polymers for Biomaterials and 3D Printing, TU Wien, Vienna 1060, Austria
- Institute
of Applied Synthetic Chemistry, Division of Macromolecular Chemistry, TU Wien, Vienna 1060, Austria
- Austrian
Cluster for Tissue Regeneration, Vienna 1200, Austria
| | - Andreas Rohatschek
- Institute
of Lightweight Design and Structural Biomechanics, TU Wien, Vienna 1060, Austria
- Austrian
Cluster for Tissue Regeneration, Vienna 1200, Austria
- Biointerface
Doctorate School, TU Wien, Vienna 1060, Austria
| | - Orestis Andriotis
- Institute
of Lightweight Design and Structural Biomechanics, TU Wien, Vienna 1060, Austria
- Austrian
Cluster for Tissue Regeneration, Vienna 1200, Austria
| | - Nikolaos Bouropoulos
- Department
of Materials Science, University of Patras, Rio Patras GR-26504, Greece
- Foundation
for Research and Technology Hellas, Institute of Chemical Engineering
and High Temperature Chemical Processes, FORTH/ICE-HT, Patras 26504, Greece
| | - Robert Liska
- Institute
of Applied Synthetic Chemistry, Division of Macromolecular Chemistry, TU Wien, Vienna 1060, Austria
- Austrian
Cluster for Tissue Regeneration, Vienna 1200, Austria
- Biointerface
Doctorate School, TU Wien, Vienna 1060, Austria
| | - Philipp J. Thurner
- Institute
of Lightweight Design and Structural Biomechanics, TU Wien, Vienna 1060, Austria
- Austrian
Cluster for Tissue Regeneration, Vienna 1200, Austria
- Biointerface
Doctorate School, TU Wien, Vienna 1060, Austria
| | - Stefan Baudis
- Christian
Doppler Laboratory for Advanced Polymers for Biomaterials and 3D Printing, TU Wien, Vienna 1060, Austria
- Institute
of Applied Synthetic Chemistry, Division of Macromolecular Chemistry, TU Wien, Vienna 1060, Austria
- Austrian
Cluster for Tissue Regeneration, Vienna 1200, Austria
- Biointerface
Doctorate School, TU Wien, Vienna 1060, Austria
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2553
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Effective screening of SARS-CoV-2 neutralizing antibodies in patient serum using lentivirus particles pseudotyped with SARS-CoV-2 spike glycoprotein. Sci Rep 2020; 10:19076. [PMID: 33154514 PMCID: PMC7645753 DOI: 10.1038/s41598-020-76135-w] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 10/19/2020] [Indexed: 12/13/2022] Open
Abstract
Pseuodotyped particles have significant importance and use in virology as tools for studying the biology of highly pathogenic viruses in a lower biosafety environment. The biological, chemical, and serological studies of the recently emerged SARS-CoV-2 will be greatly aided by the development and optimization of a suitable pseudotyping system. Here, we pseudotyped the SARS-CoV-2 Spike glycoprotein (SPG) on a traditional retroviral (MMLV) as well as a third generation lentiviral (pLV) vector and tested the transduction efficiency in several mammalian cell lines expressing SARS-CoV-2 receptor hACE2. While MMLV pseudotyped the vesicular stomatitis virus G glycoprotein (VSV-G) efficiently, it could not pseudotype the full-length SPG. In contrast, pLV pseudotyped both glycoproteins efficiently; however, much higher titers of pLV-G particles were produced. Among all the tested mammalian cells, 293Ts expressing hACE2 were most efficiently transduced using the pLV-S system. The pLV-S particles were efficiently neutralized by diluted serum (>:640) from recently recovered COVID-19 patients who showed high SARS-CoV-2 specific IgM and IgG levels. In summary, pLV-S pseudotyped virus provides a valid screening tool for the presence of anti SARS-CoV-2 specific neutralizing antibodies in convalescent patient serum.
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2554
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Ouwendijk WJ, van den Ham HJ, Delany MW, van Kampen JJ, van Nierop GP, Mehraban T, Zaaraoui-Boutahar F, van IJcken WF, van den Brand JM, de Vries RD, Andeweg AC, Verjans GM. Alveolar barrier disruption in varicella pneumonia is associated with neutrophil extracellular trap formation. JCI Insight 2020; 5:138900. [PMID: 33021967 PMCID: PMC7710321 DOI: 10.1172/jci.insight.138900] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 09/30/2020] [Indexed: 12/29/2022] Open
Abstract
Primary varicella-zoster virus (VZV) infection in adults is often complicated by severe pneumonia, which is difficult to treat and is associated with high morbidity and mortality. Here, the simian varicella virus (SVV) nonhuman primate (NHP) model was used to investigate the pathogenesis of varicella pneumonia. SVV infection resulted in transient fever, viremia, and robust virus replication in alveolar pneumocytes and bronchus-associated lymphoid tissue. Clearance of infectious virus from lungs coincided with robust innate immune responses, leading to recruitment of inflammatory cells, mainly neutrophils and lymphocytes, and finally severe acute lung injury. SVV infection caused neutrophil activation and formation of neutrophil extracellular traps (NETs) in vitro and in vivo. Notably, NETs were also detected in lung and blood specimens of varicella pneumonia patients. Lung pathology in the SVV NHP model was associated with dysregulated expression of alveolar epithelial cell tight junction proteins (claudin-2, claudin-10, and claudin-18) and alveolar endothelial adherens junction protein VE-cadherin. Importantly, factors released by activated neutrophils, including NETs, were sufficient to reduce claudin-18 and VE-cadherin expression in NHP lung slice cultures. Collectively, the data indicate that alveolar barrier disruption in varicella pneumonia is associated with NET formation.
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Affiliation(s)
| | - Henk-Jan van den Ham
- Department of Viroscience, Erasmus MC, Rotterdam, Netherlands.,ENPICOM BV, 's-Hertogenbosch, Netherlands
| | - Mark W Delany
- Department of Pathobiology, Faculty of Veterinary Science, Utrecht University, Utrecht, Netherlands
| | | | | | - Tamana Mehraban
- Department of Viroscience, Erasmus MC, Rotterdam, Netherlands
| | | | | | - Judith Ma van den Brand
- Department of Pathobiology, Faculty of Veterinary Science, Utrecht University, Utrecht, Netherlands
| | - Rory D de Vries
- Department of Viroscience, Erasmus MC, Rotterdam, Netherlands
| | - Arno C Andeweg
- Department of Viroscience, Erasmus MC, Rotterdam, Netherlands
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2555
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Stanley FKT, Berger ND, Pearson DD, Danforth JM, Morrison H, Johnston JE, Warnock TS, Brenner DR, Chan JA, Pierce G, Cobb JA, Ploquin NP, Goodarzi AA. A high-throughput alpha particle irradiation system for monitoring DNA damage repair, genome instability and screening in human cell and yeast model systems. Nucleic Acids Res 2020; 48:e111. [PMID: 33010172 PMCID: PMC7641727 DOI: 10.1093/nar/gkaa782] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 08/27/2020] [Accepted: 09/08/2020] [Indexed: 12/14/2022] Open
Abstract
Ionizing radiation (IR) is environmentally prevalent and, depending on dose and linear energy transfer (LET), can elicit serious health effects by damaging DNA. Relative to low LET photon radiation (X-rays, gamma rays), higher LET particle radiation produces more disease causing, complex DNA damage that is substantially more challenging to resolve quickly or accurately. Despite the majority of human lifetime IR exposure involving long-term, repetitive, low doses of high LET alpha particles (e.g. radon gas inhalation), technological limitations to deliver alpha particles in the laboratory conveniently, repeatedly, over a prolonged period, in low doses and in an affordable, high-throughput manner have constrained DNA damage and repair research on this topic. To resolve this, we developed an inexpensive, high capacity, 96-well plate-compatible alpha particle irradiator capable of delivering adjustable, low mGy/s particle radiation doses in multiple model systems and on the benchtop of a standard laboratory. The system enables monitoring alpha particle effects on DNA damage repair and signalling, genome stability pathways, oxidative stress, cell cycle phase distribution, cell viability and clonogenic survival using numerous microscopy-based and physical techniques. Most importantly, this method is foundational for high-throughput genetic screening and small molecule testing in mammalian and yeast cells.
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Affiliation(s)
- Fintan K T Stanley
- Robson DNA Science Centre, Departments of Biochemistry and Molecular Biology and Oncology, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - N Daniel Berger
- Robson DNA Science Centre, Departments of Biochemistry and Molecular Biology and Oncology, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - Dustin D Pearson
- Robson DNA Science Centre, Departments of Biochemistry and Molecular Biology and Oncology, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - John M Danforth
- Robson DNA Science Centre, Departments of Biochemistry and Molecular Biology and Oncology, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - Hali Morrison
- Division of Medical Physics, Department of Oncology, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - James E Johnston
- Robson DNA Science Centre, Departments of Biochemistry and Molecular Biology and Oncology, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - Tyler S Warnock
- Robson DNA Science Centre, Departments of Cancer Epidemiology and Prevention Research and Community Health Sciences, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - Darren R Brenner
- Robson DNA Science Centre, Departments of Cancer Epidemiology and Prevention Research and Community Health Sciences, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - Jennifer A Chan
- Department of Pathology and Laboratory Medicine, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - Greg Pierce
- Division of Medical Physics, Department of Oncology, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - Jennifer A Cobb
- Robson DNA Science Centre, Departments of Biochemistry and Molecular Biology and Oncology, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - Nicolas P Ploquin
- Division of Medical Physics, Department of Oncology, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
| | - Aaron A Goodarzi
- Robson DNA Science Centre, Departments of Biochemistry and Molecular Biology and Oncology, Charbonneau Cancer Institute, Cumming School of Medicine, University of Calgary, Calgary, Alberta, T2N 1N4, Canada
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2556
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Li A, Tanzi RE. <p>Optogenetic Pacing: Current Insights and Future Potential</p>. RESEARCH REPORTS IN CLINICAL CARDIOLOGY 2020. [DOI: 10.2147/rrcc.s242650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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2557
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Ganau M, Iqbal M, Ligarotti GKI, Syrmos N. Breakthrough in the assessment of cerebral perfusion and vascular permeability after brain trauma through the adoption of dynamic indocyanine green-enhanced near-infrared spectroscopy. Quant Imaging Med Surg 2020; 10:2081-2084. [PMID: 33141119 DOI: 10.21037/qims-20-905] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Mario Ganau
- Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford University, UK
| | - Mohammad Iqbal
- Department of Clinical Neurosciences, John Radcliffe Hospital, Oxford University, UK
| | | | - Nikolaos Syrmos
- Faculty of Health Sciences, Aristotle University of Thessaloniki, Thessaloniki, Greece
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2558
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Martin-Fernandez ML. A brief history of the octopus imaging facility to celebrate its 10th anniversary. J Microsc 2020; 281:3-15. [PMID: 33111321 DOI: 10.1111/jmi.12974] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 10/19/2020] [Accepted: 10/23/2020] [Indexed: 11/27/2022]
Abstract
Octopus (Optics Clustered to OutPut Unique Solutions) celebrated in June 2020 its 10th birthday. Based at Harwell, near Oxford, Octopus is an open access, peer reviewed, national imaging facility that offers successful U.K. applicants supported access to single molecule imaging, confocal microscopy, several flavours of superresolution imaging, light sheet microscopy, optical trapping and cryoscanning electron microscopy. Managed by a multidisciplinary team, Octopus has so far assisted >100 groups of U.K. and international researchers. Cross-fertilisation across fields proved to be a strong propeller of success underpinned by combining access to top-end instrumentation with a strong programme of imaging hardware and software developments. How Octopus was born, and highlights of the multidisciplinary output produced during its 10-year journey are reviewed below, with the aim of celebrating a myriad of collaborations with the U.K. scientific community, and reflecting on their scientific and societal impact.
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Affiliation(s)
- M L Martin-Fernandez
- Central Laser Facility, Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell, Didcot, Oxford, U.K
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2559
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Prakash A, Monteiro A. Cell Dissociation from Butterfly Pupal Wing Tissues for Single-Cell RNA Sequencing. Methods Protoc 2020; 3:mps3040072. [PMID: 33126499 PMCID: PMC7712902 DOI: 10.3390/mps3040072] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 10/26/2020] [Accepted: 10/26/2020] [Indexed: 01/25/2023] Open
Abstract
Butterflies are well known for their beautiful wings and have been great systems to understand the ecology, evolution, genetics, and development of patterning and coloration. These color patterns are mosaics on the wing created by the tiling of individual units called scales, which develop from single cells. Traditionally, bulk RNA sequencing (RNA-seq) has been used extensively to identify the loci involved in wing color development and pattern formation. RNA-seq provides an averaged gene expression landscape of the entire wing tissue or of small dissected wing regions under consideration. However, to understand the gene expression patterns of the units of color, which are the scales, and to identify different scale cell types within a wing that produce different colors and scale structures, it is necessary to study single cells. This has recently been facilitated by the advent of single-cell sequencing. Here, we provide a detailed protocol for the dissociation of cells from Bicyclus anynana pupal wings to obtain a viable single-cell suspension for downstream single-cell sequencing. We outline our experimental design and the use of fluorescence-activated cell sorting (FACS) to obtain putative scale-building and socket cells based on size. Finally, we discuss some of the current challenges of this technique in studying single-cell scale development and suggest future avenues to address these challenges.
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Affiliation(s)
- Anupama Prakash
- Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore 117543, Singapore
- Correspondence: (A.P.); (A.M.)
| | - Antónia Monteiro
- Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore 117543, Singapore
- Yale-NUS College, 10 College Avenue West, Singapore 138609, Singapore
- Correspondence: (A.P.); (A.M.)
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2560
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Seninde DR, Chambers E. A Comparison of the Percentage of "Yes" (Agree) Responses and Importance of Attributes (Constructs) determined using Check-All-That-Apply and Check-All-Statements (Yes/No) Question Formats in Five Countries. Foods 2020; 9:foods9111566. [PMID: 33126769 PMCID: PMC7692871 DOI: 10.3390/foods9111566] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 10/27/2020] [Accepted: 10/27/2020] [Indexed: 11/16/2022] Open
Abstract
Check All That Apply (CATA) has become a popular type of questionnaire response in sensory/consumer research in recent years. However, some authors have pointed out potential problems with the method. An online survey using either a Check-All-That-Apply (CATA) or Check-All-Statements (CAS) format for questions was conducted to provide a deeper understanding of the response data using the two question formats. With CATA, respondents select all terms or statements that apply from a given list, while, with CAS, respondents must respond (e.g., yes/no or agree/disagree) to each term or statement to show that it applies or does not apply. Respondents from five countries (Brazil, China, India, Spain, and the USA) were randomly assigned one of the two question formats (N = 200 per country per method). Motivations for eating items that belong to five food groups (starchy, protein, dairy, fruits, and desserts) were assessed. Results showed that CAS had higher percentages of “agree” responses than CATA. Also, the response ratio of CAS and CATA data was different, suggesting that interpretations of the data from each response type would also be different. Respondents in the USA, China, and Spain took longer to complete the CAS questionnaire, while respondents in Brazil and India had similar time durations for the two question formats. Overall, the CATA format was liked slightly more than the CAS format and fewer respondents dropped out of the survey when using the CATA response type. These findings suggest that the CATA format is quick and relatively easy for consumers to complete. However, it provokes fewer “apply” responses, which some psychologists suggest underestimates applicable terms or statements and CATA provides a different interpretation of data than the CAS format that requires consumers to respond to each term or statement. Further, CAS may overestimate the applicable terms. Consumer insights collected using CATA and CAS can lead to different decisions due to differences in data interpretation by researchers (e.g., marketers, nutritionists, product developers, and sensory scientists). More investigation is needed for the CATA and CAS question formats.
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2561
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Müller J, Siemann-Herzberg M, Takors R. Modeling Cell-Free Protein Synthesis Systems-Approaches and Applications. Front Bioeng Biotechnol 2020; 8:584178. [PMID: 33195146 PMCID: PMC7655533 DOI: 10.3389/fbioe.2020.584178] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 09/29/2020] [Indexed: 01/03/2023] Open
Abstract
In vitro systems are ideal setups to investigate the basic principles of biochemical reactions and subsequently the bricks of life. Cell-free protein synthesis (CFPS) systems mimic the transcription and translation processes of whole cells in a controlled environment and allow the detailed study of single components and reaction networks. In silico studies of CFPS systems help us to understand interactions and to identify limitations and bottlenecks in those systems. Black-box models laid the foundation for understanding the production and degradation dynamics of macromolecule components such as mRNA, ribosomes, and proteins. Subsequently, more sophisticated models revealed shortages in steps such as translation initiation and tRNA supply and helped to partially overcome these limitations. Currently, the scope of CFPS modeling has broadened to various applications, ranging from the screening of kinetic parameters to the stochastic analysis of liposome-encapsulated CFPS systems and the assessment of energy supply properties in combination with flux balance analysis (FBA).
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Affiliation(s)
| | | | - Ralf Takors
- Institute of Biochemical Engineering, University of Stuttgart, Stuttgart, Germany
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2562
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Valyi-Nagy K, Betsou F, Susma A, Valyi-Nagy T. Optimization of Viable Glioblastoma Cryopreservation for Establishment of Primary Tumor Cell Cultures. Biopreserv Biobank 2020; 19:60-66. [PMID: 33107762 PMCID: PMC7892309 DOI: 10.1089/bio.2020.0050] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Background: Technologies related to the establishment of primary tumor cell cultures from solid tumors, including glioblastoma, are increasingly important to oncology research and practice. However, processing of fresh tumor specimens for establishment of primary cultures on the day of surgical collection is logistically difficult. The feasibility of viable cryopreservation of glioblastoma specimens, allowing for primary culture establishment weeks to months after surgical tumor collection and freezing, was demonstrated by Mullins et al. in 2013, with a success rate of 59% that was not significantly lower than that achieved with fresh tumor tissue. However, research targeting optimization of viable glioblastoma cryopreservation protocols for establishment of primary tumor cultures has been limited. Objectives: The objective of this study was to optimize glioblastoma cryopreservation methods for viable cryobanking and to determine if two-dimensional (2D) or three-dimensional (3D) culture conditions were more supportive of glioblastoma growth after thawing of frozen tumor specimens. Methods: Portions of eight human glioblastoma specimens were cryopreserved by four different protocols differing in the time of enzymatic digestion (before or after cryopreservation), and in the type of cryopreservation media (CryoStor CS10 or 10% dimethyl sulfoxide and 90% fetal calf serum). After 1 month, frozen tissues were thawed, enzymatically digested, if not digested before, and used for initiation of 2D or 3D primary tumor cultures to determine viability. Results: Among the tested cryopreservation and culturing protocols, the most efficient combinations of cryopreservation and culture were those associated with the use of CryoStor CS10 cryopreservation medium, enzymatic digestion before freezing, and 2D culturing after thawing with a successful culture rate of 8 out of 8 cases (100%). Two-dimensional cultures were in general more efficient for the support of tumor cell growth after thawing than 3D cultures. Conclusions: This study supports development of evidence-based viable glioblastoma cryopreservation methods for use in glioblastoma biobanking and research.
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Affiliation(s)
- Klara Valyi-Nagy
- Department of Pathology, University of Illinois at Chicago, Chicago, Illinois, USA.,ISBER Biospecimen Science Working Group, Vancouver, British Columbia, Canada
| | - Fay Betsou
- ISBER Biospecimen Science Working Group, Vancouver, British Columbia, Canada.,Integrated BioBank of Luxembourg, Dudelange, Luxembourg
| | - Alexandru Susma
- Department of Pathology, University of Illinois at Chicago, Chicago, Illinois, USA
| | - Tibor Valyi-Nagy
- Department of Pathology, University of Illinois at Chicago, Chicago, Illinois, USA
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2563
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Alghadban S, Bouchareb A, Hinch R, Hernandez-Pliego P, Biggs D, Preece C, Davies B. Electroporation and genetic supply of Cas9 increase the generation efficiency of CRISPR/Cas9 knock-in alleles in C57BL/6J mouse zygotes. Sci Rep 2020; 10:17912. [PMID: 33087834 PMCID: PMC7578782 DOI: 10.1038/s41598-020-74960-7] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 10/08/2020] [Indexed: 01/12/2023] Open
Abstract
CRISPR/Cas9 machinery delivered as ribonucleoprotein (RNP) to the zygote has become a standard tool for the development of genetically modified mouse models. In recent years, a number of reports have demonstrated the effective delivery of CRISPR/Cas9 machinery via zygote electroporation as an alternative to the conventional delivery method of microinjection. In this study, we have performed side-by-side comparisons of the two RNP delivery methods across multiple gene loci and conclude that electroporation compares very favourably with conventional pronuclear microinjection, and report an improvement in mutagenesis efficiency when delivering CRISPR via electroporation for the generation of simple knock-in alleles using single-stranded oligodeoxynucleotide (ssODN) repair templates. In addition, we show that the efficiency of knock-in mutagenesis can be further increased by electroporation of embryos derived from Cas9-expressing donor females. The maternal supply of Cas9 to the zygote avoids the necessity to deliver the relatively large Cas9 protein, and high efficiency generation of both indel and knock-in allele can be achieved by electroporation of small single-guide RNAs and ssODN repair templates alone. Furthermore, electroporation, compared to microinjection, results in a higher rate of embryo survival and development. The method thus has the potential to reduce the number of animals used in the production of genetically modified mouse models.
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Affiliation(s)
- Samy Alghadban
- Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, UK
| | - Amine Bouchareb
- Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, UK
| | - Robert Hinch
- Big Data Institute, Li Ka Shing Centre for Health Information and Discovery, University of Oxford, Oxford, OX3 7LF, UK
| | | | - Daniel Biggs
- Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, UK
| | - Chris Preece
- Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, UK
| | - Benjamin Davies
- Wellcome Centre for Human Genetics, University of Oxford, Roosevelt Drive, Oxford, OX3 7BN, UK.
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2564
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Gangwar B, Kumar S, Darokar MP. Glabridin Averts Biofilms Formation in Methicillin-Resistant Staphylococcus aureus by Modulation of the Surfaceome. Front Microbiol 2020; 11:1779. [PMID: 33071991 PMCID: PMC7534511 DOI: 10.3389/fmicb.2020.01779] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 07/07/2020] [Indexed: 12/04/2022] Open
Abstract
Staphylococcus aureus is an opportunistic bacterium of the human body and a leading cause of nosocomial infections. Methicillin resistant S. aureus (MRSA) infections involving biofilm lead to higher mortality and morbidity in patients. Biofilm causes serious clinical issues, as it mitigates entry of antimicrobials to reach the etiological agents. It plays an important role in resilient chronic infections which place an unnecessary burden on antibiotics and the associated costs. To combat drug-resistant infection involving biofilm, there is a need to discover potential anti-biofilm agents. In this study, activity of polyphenolic flavonoid glabridin against biofilm formation of methicillin resistant clinical isolates of S. aureus is being reported for the first time. Crystal violet assay and scanning electron microscopy evidences shows that glabridin prevents formation of cells clusters and attachment of methicillin resistant clinical isolate (MRSA 4423) of S. aureus to the surface in a dose dependent manner. Gel free proteomic analysis of biofilm matrix by LC-ESI-QTOF confirmed the existence of several proteins known to be involved in cells adhesion. Furthermore, expression analysis of cell surface proteins revealed that glabridin significantly down regulates an abundance of several surface-associated adhesins including fibronectin binding proteins (FnbA, FnbB), serine-aspartate repeat-containing protein D (SdrD), immunoglobulin-binding protein G (Sbi), and other virulence factors which were induced by extracellular glucose in MRSA 4423. In addition, several moonlighting proteins (proteins with multiple functions) such as translation elongation factors (EF-Tu, EF-G), chaperone protein (DnaK), glyceraldehyde 3-phosphate dehydrogenase (GAPDH) and pyruvate kinase (PK) were detected on the cell surface wherein their abundance was inversely proportional to surface-associated adhesins. This study clearly suggests that glabridin prevents biofilm formation in S. aureus through modulation of the cell surface proteins.
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Affiliation(s)
- Bhavana Gangwar
- Molecular Bioprospection Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
| | - Santosh Kumar
- Molecular Bioprospection Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India.,Department of Biological Sciences, The University of Texas at Dallas, Richardson, TX, United States
| | - Mahendra P Darokar
- Molecular Bioprospection Department, CSIR-Central Institute of Medicinal and Aromatic Plants, Lucknow, India
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2565
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Levine MZ, So B, Mullin AC, Fanter R, Dillard K, Watts KR, La Frano MR, Oza JP. Activation of Energy Metabolism through Growth Media Reformulation Enables a 24-Hour Workflow for Cell-Free Expression. ACS Synth Biol 2020; 9:2765-2774. [PMID: 32835484 DOI: 10.1021/acssynbio.0c00283] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Cell-free protein synthesis (CFPS) platforms have undergone numerous workflow improvements to enable diverse applications in research, biomanufacturing, and education. The Escherichia coli cell extract-based platform has been broadly adopted due to its affordability and versatility. The upstream processing of cells to generate crude cell lysate remains time-intensive and technically nuanced, representing one of the largest sources of cost associated with the biotechnology. To overcome these limitations, we have improved the processes by developing a long-lasting autoinduction media formulation for CFPS that obviates human intervention between inoculation and harvest. The cell-free autoinduction (CFAI) media supports the production of robust cell extracts from high cell density cultures nearing the stationary phase of growth. As a result, the total mass of cells and the resulting extract volume obtained increases by 400% while maintaining robust reaction yields of reporter protein, sfGFP (>1 mg/mL). Notably, the CFAI workflow allows users to go from cells on a streak plate to completing CFPS reactions within 24 h. The CFAI workflow uniquely enabled us to elucidate the metabolic limits in CFPS associated with cells grown to stationary phase in the traditional 2× YTPG media. Metabolomics analysis demonstrates that CFAI-based extracts overcome these limits due to improved energy metabolism and redox balance. The advances reported here shed new light on the metabolism associated with highly active CFPS reactions and inform future efforts to tune the metabolism in CFPS systems. Additionally, we anticipate that the improvements in the time and cost-efficiency of CFPS will increase the simplicity and reproducibility, reducing the barriers for new researchers interested in implementing CFPS.
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Affiliation(s)
- Max Z. Levine
- Department of Biological Sciences, California Polytechnic State University, San Luis Obispo, California 93407, United States
- Center for Application in Biotechnology, California Polytechnic State University, San Luis Obispo, California 93407, United States
| | - Byungcheol So
- Department of Chemistry and Biochemistry, California Polytechnic State University, San Luis Obispo, California 93407, United States
- Center for Application in Biotechnology, California Polytechnic State University, San Luis Obispo, California 93407, United States
| | - Alissa C. Mullin
- Department of Chemistry and Biochemistry, California Polytechnic State University, San Luis Obispo, California 93407, United States
- Center for Application in Biotechnology, California Polytechnic State University, San Luis Obispo, California 93407, United States
| | - Rob Fanter
- College of Agriculture, Food and Environmental Sciences, California Polytechnic State University, San Luis Obispo, California 93407, United States
| | - Kayla Dillard
- Department of Food Science and Nutrition, California Polytechnic State University, San Luis Obispo, California 93407, United States
| | - Katharine R. Watts
- Department of Chemistry and Biochemistry, California Polytechnic State University, San Luis Obispo, California 93407, United States
- Center for Application in Biotechnology, California Polytechnic State University, San Luis Obispo, California 93407, United States
| | - Michael R. La Frano
- Department of Food Science and Nutrition, California Polytechnic State University, San Luis Obispo, California 93407, United States
- Center for Health Research, California Polytechnic State University, San Luis Obispo, California 93407, United States
| | - Javin P. Oza
- Department of Chemistry and Biochemistry, California Polytechnic State University, San Luis Obispo, California 93407, United States
- Center for Application in Biotechnology, California Polytechnic State University, San Luis Obispo, California 93407, United States
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2566
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Oh S, Song H, Freeman WM, Shin S, Janknecht R. Cooperation between ETS transcription factor ETV1 and histone demethylase JMJD1A in colorectal cancer. Int J Oncol 2020; 57:1319-1332. [PMID: 33174020 PMCID: PMC7646594 DOI: 10.3892/ijo.2020.5133] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Accepted: 10/05/2020] [Indexed: 12/18/2022] Open
Abstract
ETS variant 1 (ETV1) is an oncogenic transcription factor. However, its role in colorectal cancer has remained understudied. The present study demonstrated that ETV1 downregulation led to reduced HCT116 colorectal cancer cell growth and clonogenic activity. Furthermore, the ETV1 mRNA levels were enhanced in colorectal tumors and were associated with disease severity. In addition, ETV1 directly bound to Jumonji C domain-containing (JMJD) 1A, a histone demethylase known to promote colon cancer. ETV1 and JMJD1A, but not a catalytically inactive mutant thereof, cooperated in inducing the matrix metalloproteinase (MMP)1 gene promoter that was similar to the cooperation between ETV1 and another histone demethylase, JMJD2A. RNA-sequencing revealed multiple potential ETV1 target genes in HCT116 cells, including the FOXQ1 and TBX6 transcription factor genes. Moreover, JMJD1A co-regulated FOXQ1 and other ETV1 target genes, but not TBX6, whereas JMJD2A downregulation had no impact on FOXQ1 as well as TBX6 transcription. Accordingly, the FOXQ1 gene promoter was stimulated by ETV1 and JMJD1A in a cooperative manner, and both ETV1 and JMJD1A bound to the FOXQ1 promoter. Notably, the overexpression of FOXQ1 partially reversed the growth inhibitory effects of ETV1 ablation on HCT116 cells, whereas TBX6 impaired HCT116 cell growth and may thereby dampen the oncogenic activity of ETV1. The latter also revealed for the first time, to the best of our knowledge, a potential tumor suppressive function of TBX6. Taken together, the present study uncovered a ETV1/JMJD1A-FOXQ1 axis that may drive colorectal tumorigenesis.
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Affiliation(s)
- Sangphil Oh
- Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Hoogeun Song
- Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | | | - Sook Shin
- Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
| | - Ralf Janknecht
- Department of Cell Biology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
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2567
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Vicente-Martínez Y, Caravaca M, Soto-Meca A. Determination of Very Low Concentration of Bisphenol A in Toys and Baby Pacifiers Using Dispersive Liquid-Liquid Microextraction by In Situ Ionic Liquid Formation and High-Performance Liquid Chromatography. Pharmaceuticals (Basel) 2020; 13:E301. [PMID: 33053676 PMCID: PMC7601780 DOI: 10.3390/ph13100301] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 10/05/2020] [Accepted: 10/09/2020] [Indexed: 11/16/2022] Open
Abstract
Bisphenol A (BPA) is a chemical compound used in the manufacturing of plastics and resins whose presence in the body in low concentrations can cause serious health problems. Due to this, there is a growing interest in the scientific community to develop analytical methods that allow quantifying trace concentrations of BPA in different types of samples. The determination of this compound in toys made of plastics that can be manipulated by children leads to an extra concern, because it is possible for BPA to enter the body by introducing these toys into the mouth. This work presents a novel procedure to the quickly and easily quantification of trace levels of BPA in samples of toys and pacifiers according to the current demanding regulations. The determination of very low levels of BPA was carried out by ionic liquid dispersive liquid-liquid microextraction (IL-DLLME) followed by high-performance liquid chromatography (HPLC). The formation in situ of the ionic liquid (IL) 1-octyl-3-methylimidazolium bis((trifluoromethane)sulfonyl)imide ([C8MIm] [NTf2]), was achieved by mixing 1-octyl-3-methylimidazolium chloride ([C8MIm]Cl) and lithium bis(trifluoromethanesulfonyl)imide ([NTf2]Li) aqueous solutions, reaching an instant dispersion whose cloud of microdrops allows the total extraction of BPA in the IL from aqueous solutions. After centrifugation, BPA concentration in the sedimented phase was determined by HPLC. The optimal experimental conditions for the microextraction and determination of BPA in the IL were studied. The total extraction was achieved at pH 4, heating the sample at 30 °C for 5 min, using 100 µL of IL precursor volume, and spinning after the formation of dispersion at 3000 rpm for 10 min. The enrichment factor (EF) and detection limit (LOD) reached with the procedure were 299 and 0.19 µg L-1, respectively. The relative standard deviation for ten replications at the 0.5 µg L-1 level was 5.2%. Recovery studies showed a mean value for BPA recovery percentage in the samples of 99%. Additionally, a hybrid model was applied to characterize the extraction kinetics. This simple, low cost and fast method simplifies traditional microextraction techniques, representing an outstanding alternative.
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Affiliation(s)
| | - Manuel Caravaca
- Spanish Air Force Academy, University Centre of Defence, Coronel López Peña st., n/n, 30720 Murcia, Spain; (Y.V.-M.); (A.S.-M.)
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2568
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Pellegrino G, Basile F, Relics D, Ferri A, Grande F, Tarsitano A, Marchetti C. Computer-Aided Rehabilitation Supported by Zygomatic Implants: A Cohort Study Comparing Atrophic with Oncologic Patients after Five Years of Follow-Up. J Clin Med 2020; 9:jcm9103254. [PMID: 33053696 PMCID: PMC7600816 DOI: 10.3390/jcm9103254] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Revised: 10/03/2020] [Accepted: 10/07/2020] [Indexed: 12/22/2022] Open
Abstract
The aim of this study was to evaluate the survival and clinical success rate, complications, and patients’ quality of life after computer-aided rehabilitation supported by zygomatic implants in cases of severe maxillary atrophy (ten patients) and in bone defects in oncologic patients (ten patients). All patients underwent computer-aided planning and surgery. Seventy-three zygomatic implants were placed. The mean follow-up period was 39.9 months. Implant survival and clinical success rate, the effectiveness of planning the implant length, biological and prosthetic complications, and the quality of life were evaluated. The five-year implant survival rate for patients with maxillary atrophy and oncologic patients was 97.4% and 96.7%, respectively. The prosthetic survival rate was 100%. Two implant failures occurred in the first year. One implant failure was observed in each group. Minor biological and prosthetic complications occurred in both groups without significant differences. All complications were managed without affecting the treatment. The quality of life increased by 71.3% in the atrophic group and by 82.9% in the oncologic group. Zygomatic implant rehabilitation seems to be a reliable technique for patients with maxillary atrophy and for oncologic patients. The three-dimensional computer-aided approach allows the surgeon to plan the surgery and increase its predictability. Early prosthesis loading certainly allows for better functional outcomes.
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Affiliation(s)
- Gerardo Pellegrino
- Oral and Maxillofacial Surgery Unit, DIBINEM, University of Bologna, 40100 Bologna, Italy; (G.P.); (F.B.); (D.R.); (A.F.); (F.G.)
| | - Francesco Basile
- Oral and Maxillofacial Surgery Unit, DIBINEM, University of Bologna, 40100 Bologna, Italy; (G.P.); (F.B.); (D.R.); (A.F.); (F.G.)
| | - Daniela Relics
- Oral and Maxillofacial Surgery Unit, DIBINEM, University of Bologna, 40100 Bologna, Italy; (G.P.); (F.B.); (D.R.); (A.F.); (F.G.)
| | - Agnese Ferri
- Oral and Maxillofacial Surgery Unit, DIBINEM, University of Bologna, 40100 Bologna, Italy; (G.P.); (F.B.); (D.R.); (A.F.); (F.G.)
| | - Francesco Grande
- Oral and Maxillofacial Surgery Unit, DIBINEM, University of Bologna, 40100 Bologna, Italy; (G.P.); (F.B.); (D.R.); (A.F.); (F.G.)
| | - Achille Tarsitano
- Oral and Maxillofacial Surgery Unit, Azienda Ospedaliero-Universitaria di Bologna, DIBINEM, University of Bologna, 40100 Bologna, Italy;
- Correspondence: ; Tel.: +39-051-214-2463
| | - Claudio Marchetti
- Oral and Maxillofacial Surgery Unit, Azienda Ospedaliero-Universitaria di Bologna, DIBINEM, University of Bologna, 40100 Bologna, Italy;
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2569
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Lai B, Bernhardt PV, Krömer JO. Cytochrome c Reductase is a Key Enzyme Involved in the Extracellular Electron Transfer Pathway towards Transition Metal Complexes in Pseudomonas Putida. CHEMSUSCHEM 2020; 13:5308-5317. [PMID: 32678505 PMCID: PMC7589348 DOI: 10.1002/cssc.202001645] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 07/16/2020] [Indexed: 05/06/2023]
Abstract
Mediator-based extracellular electron transfer (EET) pathways can balance the redox metabolism of microbes. However, such electro-biosynthesis processes are constrained by the unknown underlying EET mechanisms. In this paper, Pseudomonas putida was studied to systematically investigate its EET pathway to transition metal complexes (i. e., [Fe(CN)6 ]3-/4- and [Co(bpy)3 ]3+/2+ ; bpy=2,2'-bipyridyl) under anaerobic conditions. Comparative proteomics showed the aerobic respiratory components were upregulated in a bioelectrochemical system without oxygen, suggesting their potential contribution to EET. Further tests found inhibiting cytochrome c oxidase activity by NaN3 and NADH dehydrogenase by rotenone did not significantly change the current output. However, the EET pathway was completely blocked, while cytochrome c reductase activity was inhibited by antimycin A. Although it cannot be excluded that cytochrome c and the periplasmic subunit of cytochrome c oxidase donate electrons to the transition metal complexes, these results strongly demonstrate that cytochrome c reductase is a key complex for the EET pathway.
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Affiliation(s)
- Bin Lai
- Systems Biotechnology group, Department of Solar MaterialsHelmholtz Centre for Environmental Research - UFZLeipzig04318Germany
- Advanced Water Management CentreThe University of QueenslandBrisbane4072Australia
| | - Paul V. Bernhardt
- School of Chemical and Molecular BiosciencesThe University of QueenslandBrisbane4072Australia
| | - Jens O. Krömer
- Systems Biotechnology group, Department of Solar MaterialsHelmholtz Centre for Environmental Research - UFZLeipzig04318Germany
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2570
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Designing peptide nanoparticles for efficient brain delivery. Adv Drug Deliv Rev 2020; 160:52-77. [PMID: 33031897 DOI: 10.1016/j.addr.2020.10.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 09/28/2020] [Accepted: 10/01/2020] [Indexed: 12/12/2022]
Abstract
The targeted delivery of therapeutic compounds to the brain is arguably the most significant open problem in drug delivery today. Nanoparticles (NPs) based on peptides and designed using the emerging principles of molecular engineering show enormous promise in overcoming many of the barriers to brain delivery faced by NPs made of more traditional materials. However, shortcomings in our understanding of peptide self-assembly and blood-brain barrier (BBB) transport mechanisms pose significant obstacles to progress in this area. In this review, we discuss recent work in engineering peptide nanocarriers for the delivery of therapeutic compounds to the brain: from synthesis, to self-assembly, to in vivo studies, as well as discussing in detail the biological hurdles that a nanoparticle must overcome to reach the brain.
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2571
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Lee JC, Mehdizadeh S, Smith J, Young A, Mufazalov IA, Mowery CT, Daud A, Bluestone JA. Regulatory T cell control of systemic immunity and immunotherapy response in liver metastasis. Sci Immunol 2020; 5:eaba0759. [PMID: 33008914 PMCID: PMC7755924 DOI: 10.1126/sciimmunol.aba0759] [Citation(s) in RCA: 164] [Impact Index Per Article: 41.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 09/09/2020] [Indexed: 12/18/2022]
Abstract
Patients with cancer with liver metastasis demonstrate significantly worse outcomes than those without liver metastasis when treated with anti-PD-1 immunotherapy. The mechanism of liver metastases-induced reduction in systemic antitumor immunity is unclear. Using a dual-tumor immunocompetent mouse model, we found that the immune response to tumor antigen presence within the liver led to the systemic suppression of antitumor immunity. The immune suppression was antigen specific and associated with the coordinated activation of regulatory T cells (Tregs) and modulation of intratumoral CD11b+ monocytes. The dysfunctional immune state could not be reversed by anti-PD-1 monotherapy unless Treg cells were depleted (anti-CTLA-4) or destabilized (EZH2 inhibitor). Thus, this study provides a mechanistic understanding and rationale for adding Treg and CD11b+ monocyte targeting agents in combination with anti-PD-1 to treat patients with cancer with liver metastasis.
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MESH Headings
- Animals
- Antineoplastic Combined Chemotherapy Protocols/pharmacology
- Antineoplastic Combined Chemotherapy Protocols/therapeutic use
- CD11b Antigen/metabolism
- CD8-Positive T-Lymphocytes/drug effects
- CD8-Positive T-Lymphocytes/immunology
- CD8-Positive T-Lymphocytes/metabolism
- CTLA-4 Antigen/antagonists & inhibitors
- CTLA-4 Antigen/metabolism
- Cell Line, Tumor/transplantation
- Disease Models, Animal
- Drug Resistance, Neoplasm/drug effects
- Drug Resistance, Neoplasm/immunology
- Enhancer of Zeste Homolog 2 Protein/antagonists & inhibitors
- Enhancer of Zeste Homolog 2 Protein/metabolism
- Female
- Humans
- Immune Checkpoint Inhibitors/pharmacology
- Immune Checkpoint Inhibitors/therapeutic use
- Liver Neoplasms/drug therapy
- Liver Neoplasms/immunology
- Liver Neoplasms/secondary
- Lymphocyte Depletion/methods
- Lymphocytes, Tumor-Infiltrating/drug effects
- Lymphocytes, Tumor-Infiltrating/immunology
- Lymphocytes, Tumor-Infiltrating/metabolism
- Male
- Mice
- Mice, Transgenic
- T-Lymphocytes, Regulatory/drug effects
- T-Lymphocytes, Regulatory/immunology
- T-Lymphocytes, Regulatory/metabolism
- Tumor Escape/drug effects
- Tumor Microenvironment/drug effects
- Tumor Microenvironment/immunology
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Affiliation(s)
- James C Lee
- Division of Hematology and Oncology, University of California, San Francisco, San Francisco, CA 94143, USA.
- Sean N. Parker Autoimmune Research Laboratory, University of California, San Francisco, San Francisco, CA 94143, USA
- Diabetes Center, University of California, San Francisco, San Francisco, CA 94143, USA
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Sadaf Mehdizadeh
- Sean N. Parker Autoimmune Research Laboratory, University of California, San Francisco, San Francisco, CA 94143, USA
- Diabetes Center, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Jennifer Smith
- Sean N. Parker Autoimmune Research Laboratory, University of California, San Francisco, San Francisco, CA 94143, USA
- Diabetes Center, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Arabella Young
- Sean N. Parker Autoimmune Research Laboratory, University of California, San Francisco, San Francisco, CA 94143, USA
- Diabetes Center, University of California, San Francisco, San Francisco, CA 94143, USA
- QIMR Berghofer Medical Research Institute, Herston, Queensland 4006, Australia
| | - Ilgiz A Mufazalov
- Sean N. Parker Autoimmune Research Laboratory, University of California, San Francisco, San Francisco, CA 94143, USA
- Diabetes Center, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Cody T Mowery
- Diabetes Center, University of California, San Francisco, San Francisco, CA 94143, USA
- Medical Scientist Training Program, University of California, San Francisco, San Francisco, CA 94143, USA
| | - Adil Daud
- Division of Hematology and Oncology, University of California, San Francisco, San Francisco, CA 94143, USA
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94143, USA
- Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, CA 94158, USA
- Parker Institute for Cancer Immunotherapy, San Francisco, CA 94129, USA
| | - Jeffrey A Bluestone
- Sean N. Parker Autoimmune Research Laboratory, University of California, San Francisco, San Francisco, CA 94143, USA.
- Diabetes Center, University of California, San Francisco, San Francisco, CA 94143, USA
- Department of Medicine, University of California, San Francisco, San Francisco, CA 94143, USA
- Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, San Francisco, CA 94158, USA
- Parker Institute for Cancer Immunotherapy, San Francisco, CA 94129, USA
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2572
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Abe KT, Li Z, Samson R, Samavarchi-Tehrani P, Valcourt EJ, Wood H, Budylowski P, Dupuis AP, Girardin RC, Rathod B, Wang JH, Barrios-Rodiles M, Colwill K, McGeer AJ, Mubareka S, Gommerman JL, Durocher Y, Ostrowski M, McDonough KA, Drebot MA, Drews SJ, Rini JM, Gingras AC. A simple protein-based surrogate neutralization assay for SARS-CoV-2. JCI Insight 2020; 5:142362. [PMID: 32870820 PMCID: PMC7566699 DOI: 10.1172/jci.insight.142362] [Citation(s) in RCA: 144] [Impact Index Per Article: 36.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 08/31/2020] [Indexed: 12/22/2022] Open
Abstract
Most of the patients infected with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) mount a humoral immune response to the virus within a few weeks of infection, but the duration of this response and how it correlates with clinical outcomes has not been completely characterized. Of particular importance is the identification of immune correlates of infection that would support public health decision-making on treatment approaches, vaccination strategies, and convalescent plasma therapy. While ELISA-based assays to detect and quantitate antibodies to SARS-CoV-2 in patient samples have been developed, the detection of neutralizing antibodies typically requires more demanding cell-based viral assays. Here, we present a safe and efficient protein-based assay for the detection of serum and plasma antibodies that block the interaction of the SARS-CoV-2 spike protein receptor binding domain (RBD) with its receptor, angiotensin-converting enzyme 2 (ACE2). The assay serves as a surrogate neutralization assay and is performed on the same platform and in parallel with an ELISA for the detection of antibodies against the RBD, enabling a direct comparison. The results obtained with our assay correlate with those of 2 viral-based assays, a plaque reduction neutralization test (PRNT) that uses live SARS-CoV-2 virus and a spike pseudotyped viral vector-based assay.
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Affiliation(s)
- Kento T. Abe
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, Ontario, Canada
| | - Zhijie Li
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
| | - Reuben Samson
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, Ontario, Canada
| | - Payman Samavarchi-Tehrani
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, Ontario, Canada
| | - Emelissa J. Valcourt
- Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory (NML), Public Health Agency of Canada, Winnipeg, Manitoba, Canada
| | - Heidi Wood
- Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory (NML), Public Health Agency of Canada, Winnipeg, Manitoba, Canada
| | - Patrick Budylowski
- Department of Immunology and
- Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada
| | - Alan P. Dupuis
- Wadsworth Center, New York State Department of Health, Albany, New York, USA
| | - Roxie C. Girardin
- Wadsworth Center, New York State Department of Health, Albany, New York, USA
| | - Bhavisha Rathod
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, Ontario, Canada
| | - Jenny H. Wang
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, Ontario, Canada
| | - Miriam Barrios-Rodiles
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, Ontario, Canada
| | - Karen Colwill
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, Ontario, Canada
| | - Allison J. McGeer
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, Ontario, Canada
- Department of Microbiology, University Health Network and Sinai Health System, Toronto, Ontario, Canada
- Dalla Lana School of Public Health and
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Samira Mubareka
- Department of Laboratory Medicine and Molecular Diagnostics, Division of Microbiology, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
- Biological Sciences, Sunnybrook Research Institute, Toronto, Ontario, Canada
- Division of Infectious Diseases, Sunnybrook Health Sciences Centre, Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | | | - Yves Durocher
- Mammalian Cell Expression, Human Health Therapeutics Research Centre, National Research Council Canada, Montréal, Quebec, Canada
| | - Mario Ostrowski
- Department of Immunology and
- Department of Medicine, University of Toronto, Toronto, Ontario, Canada
- Li Ka Shing Knowledge Institute, St. Michael’s Hospital, Toronto, Ontario, Canada
| | - Kathleen A. McDonough
- Wadsworth Center, New York State Department of Health, Albany, New York, USA
- Department of Biomedical Sciences, School of Public Health, University at Albany, SUNY, Albany, New York, USA
| | - Michael A. Drebot
- Zoonotic Diseases and Special Pathogens, National Microbiology Laboratory (NML), Public Health Agency of Canada, Winnipeg, Manitoba, Canada
- Department of Medical Microbiology and Infectious Disease, University of Manitoba, Manitoba, Canada
| | - Steven J. Drews
- Canadian Blood Services, Edmonton, AB & Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, Canada
| | - James M. Rini
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
- Department of Biochemistry, University of Toronto, Toronto, Ontario, Canada
| | - Anne-Claude Gingras
- Department of Molecular Genetics, University of Toronto, Toronto, Ontario, Canada
- Lunenfeld-Tanenbaum Research Institute at Mount Sinai Hospital, Sinai Health System, Toronto, Ontario, Canada
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2573
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Jardet C, David A, Braun E, Descargues P, Grolleau J, Hebsgaard J, Norsgaard H, Lovato P. Development and characterization of a human Th17-driven ex vivo skin inflammation model. Exp Dermatol 2020; 29:993-1003. [PMID: 32737987 PMCID: PMC7693225 DOI: 10.1111/exd.14160] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 06/30/2020] [Accepted: 07/17/2020] [Indexed: 12/19/2022]
Abstract
Skin models mimicking features of psoriasis-related inflammation are needed to support the development of new drugs in dermatology. Reconstructed skin models lack tissue complexity, including a fully competent skin barrier, and presence and/or diversity of immune cells. Here, we describe InflammaSkin®, a novel human Th17-driven ex vivo skin inflammation model. In this model, skin-resident T cells are in situ activated by intradermal injection of anti-CD3 and anti-CD28 antibodies and Th17 cell polarization is sustained by culture in a chemically defined medium supplemented with IL-1β, IL-23 and TGF-β for seven days. The acquired Th17 signature is demonstrated by the sustained secretion of IL-17A, IL-17AF, IL-17F, IL-22, IFN-γ, and to some degree IL-15 and TNF-α observed in the activated ex vivo skin inflammation model compared with the non-activated skin model control. Furthermore, expression of S100A7 and Keratin-16 by keratinocytes and loss of epidermal structure integrity occur subsequently to in situ Th17cell activation, demonstrating cellular crosstalk between Th17 cells and keratinocytes. Finally, we demonstrate the use of this model to investigate the modulation of the IL-23/IL-17 immune axis by topically applied anti-inflammatory compounds. Taken together, we show that by in situ activation of skin-resident Th17 cells, the InflammaSkin® model reproduces aspects of inflammatory responses observed in psoriatic lesions and could be used as a translational tool to assess efficacy of test compounds.
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Affiliation(s)
| | | | | | | | - Jean‐Louis Grolleau
- Service de Chirurgie Plastique et ReconstructriceCHU Toulouse RangueilToulouseFrance
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2574
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Michael-Kordatou I, Karaolia P, Fatta-Kassinos D. Sewage analysis as a tool for the COVID-19 pandemic response and management: the urgent need for optimised protocols for SARS-CoV-2 detection and quantification. JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 2020. [PMID: 32834990 DOI: 10.1016/j.jece:2020.104306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
COVID-19 is an ongoing global pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). As of July 29th 2020, more than 16,6 million cases have been reported in more than 188 countries/territories, leading to more than 659000 deaths. One of the main challenges facing health authorities has been testing for the virus on a sufficiently comprehensive scale. The pandemic has been an impetus for the wastewater community as it has inspired scientists to look to wastewater to help fill in the gap of measuring the prevalence of SARS-CoV-2 within a given community. Testing the wastewater may serve as an early warning system allowing timely interventions. Although viral shedding varies among individuals and over the course of their infection, the sewage system can blend these variations into an average that represents the wider studied community. The urgent need has led to a lack of coherent reporting of data regarding the analysis, as these huge and remarkable efforts by the wastewater scientific community were made in a very short time. Important information on the analytical approach is often lacking, while there is still no optimisation of the methodology, including sampling, sample storage and concentration, RNA extraction and detection/quantification. This review aims at identifying the main issues for consideration, relating to the development of validated methodological protocols for the virus quantitative analysis in wastewater. Their inclusion will enable the methodological optimisation of SARS-CoV-2 wastewater analyses, transforming the wastewater infrastructure into a source of useful information for the health sector.
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Affiliation(s)
- I Michael-Kordatou
- Nireas-International Water Research Centre, University of Cyprus, P.O. Box 20537, CY-1678, Nicosia, Cyprus
| | - P Karaolia
- Nireas-International Water Research Centre, University of Cyprus, P.O. Box 20537, CY-1678, Nicosia, Cyprus
| | - D Fatta-Kassinos
- Nireas-International Water Research Centre, University of Cyprus, P.O. Box 20537, CY-1678, Nicosia, Cyprus
- Department of Civil and Environmental Engineering, University of Cyprus, P.O. Box 20537, CY-1678, Nicosia, Cyprus
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2575
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Michael-Kordatou I, Karaolia P, Fatta-Kassinos D. Sewage analysis as a tool for the COVID-19 pandemic response and management: the urgent need for optimised protocols for SARS-CoV-2 detection and quantification. JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING 2020; 8:104306. [PMID: 32834990 PMCID: PMC7384408 DOI: 10.1016/j.jece.2020.104306] [Citation(s) in RCA: 142] [Impact Index Per Article: 35.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 07/22/2020] [Accepted: 07/23/2020] [Indexed: 05/02/2023]
Abstract
COVID-19 is an ongoing global pandemic caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). As of July 29th 2020, more than 16,6 million cases have been reported in more than 188 countries/territories, leading to more than 659000 deaths. One of the main challenges facing health authorities has been testing for the virus on a sufficiently comprehensive scale. The pandemic has been an impetus for the wastewater community as it has inspired scientists to look to wastewater to help fill in the gap of measuring the prevalence of SARS-CoV-2 within a given community. Testing the wastewater may serve as an early warning system allowing timely interventions. Although viral shedding varies among individuals and over the course of their infection, the sewage system can blend these variations into an average that represents the wider studied community. The urgent need has led to a lack of coherent reporting of data regarding the analysis, as these huge and remarkable efforts by the wastewater scientific community were made in a very short time. Important information on the analytical approach is often lacking, while there is still no optimisation of the methodology, including sampling, sample storage and concentration, RNA extraction and detection/quantification. This review aims at identifying the main issues for consideration, relating to the development of validated methodological protocols for the virus quantitative analysis in wastewater. Their inclusion will enable the methodological optimisation of SARS-CoV-2 wastewater analyses, transforming the wastewater infrastructure into a source of useful information for the health sector.
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Affiliation(s)
- I Michael-Kordatou
- Nireas-International Water Research Centre, University of Cyprus, P.O. Box 20537, CY-1678, Nicosia, Cyprus
| | - P Karaolia
- Nireas-International Water Research Centre, University of Cyprus, P.O. Box 20537, CY-1678, Nicosia, Cyprus
| | - D Fatta-Kassinos
- Nireas-International Water Research Centre, University of Cyprus, P.O. Box 20537, CY-1678, Nicosia, Cyprus
- Department of Civil and Environmental Engineering, University of Cyprus, P.O. Box 20537, CY-1678, Nicosia, Cyprus
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2576
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Dey AS, Ayon NJ, Bhattacharya C, Gutheil WG, Mukherji M. Positive/negative ion-switching-based LC-MS/MS method for quantification of cytosine derivatives produced by the TET-family 5-methylcytosine dioxygenases. Biol Methods Protoc 2020; 5:bpaa019. [PMID: 33376805 PMCID: PMC7751006 DOI: 10.1093/biomethods/bpaa019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 09/15/2020] [Accepted: 09/18/2020] [Indexed: 01/07/2023] Open
Abstract
Cytosine methylation at carbon-5 (5mC) in DNA plays crucial roles in epigenetic transcriptional regulation during metazoan development. The iron (II), 2-oxoglutarate-dependent Ten-Eleven Translocation (TET)-family dioxygenases initiate active demethylation of 5mC. TET2 oxidizes 5mC in nucleic acids into 5-hydroxymethylcytosine, 5-formylcytosine, and 5-carboxylcytosine by iterative oxidation. Mutations in the TET2 gene are frequently detected in myeloid malignancies. Despite the established and emerging roles of TET oxygenases in health and diseases, in vitro characterization of these enzymes and their mutants is still in rudimentary stages. Here, we describe an improved positive/negative ion-switching-based liquid chromatography-tandem mass spectrometry (LC–MS/MS) method that can separate and quantify modified cytosine bases produced by TET-family 5-methylcytosine dioxygenases. This method will help in further elucidate the function of epigenetically important cytosine modifications. To the best of our knowledge, this is the first study reporting ion-switching-based LC–MS/MS method to analyse cytosine variants produced in TET catalysed reactions.
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Affiliation(s)
- Aninda Sundar Dey
- Division of Pharmacology & Pharmaceutical Sciences, University of Missouri-Kansas City, Kansas City, MO 64108, USA
| | - Navid J Ayon
- Division of Pharmacology & Pharmaceutical Sciences, University of Missouri-Kansas City, Kansas City, MO 64108, USA
| | - Chayan Bhattacharya
- Division of Pharmacology & Pharmaceutical Sciences, University of Missouri-Kansas City, Kansas City, MO 64108, USA
| | - William G Gutheil
- Division of Pharmacology & Pharmaceutical Sciences, University of Missouri-Kansas City, Kansas City, MO 64108, USA
| | - Mridul Mukherji
- Division of Pharmacology & Pharmaceutical Sciences, University of Missouri-Kansas City, Kansas City, MO 64108, USA
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2577
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Greenhalgh A, Istas O, Cooper RL. Bacterial endotoxin lipopolysaccharide enhances synaptic transmission at low-output glutamatergic synapses. Neurosci Res 2020; 170:59-65. [PMID: 32987087 DOI: 10.1016/j.neures.2020.08.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 08/14/2020] [Accepted: 08/26/2020] [Indexed: 01/13/2023]
Abstract
The endotoxin lipopolysaccharides (LPS), secreted from gram-negative bacteria, has direct effects on synaptic transmission independent of systemic secondary cytokine responses. High concentration of LPS (500 μg/mL) from Serratia marcescens increased synaptic efficacy at glutamatergic low-output synapses more than for high-output synapses. Over an hour of exposure was not toxic to the preparation and continued to enhance synaptic transmission. A small but significant rapid hyperpolarization of the post-synaptic cells occurred, in addition to a slower enhancement of in the amplitude of evoked excitatory junction potentials. LPS may promote reserve pool vesicles to the readily releasable pool for low-output synapses. The action of LPS at the glutamatergic synapses of the crayfish neuromuscular junction is unique in promoting synaptic transmission as compared to other glutamatergic synapses in Drosophila and mammals, where synaptic transmission is depressed.
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Affiliation(s)
- Abigail Greenhalgh
- Department of Biology, Center for Muscle Biology, University of Kentucky, Lexington, KY, 40506-0225, USA
| | - Oscar Istas
- Department of Biology, Center for Muscle Biology, University of Kentucky, Lexington, KY, 40506-0225, USA
| | - Robin L Cooper
- Department of Biology, Center for Muscle Biology, University of Kentucky, Lexington, KY, 40506-0225, USA.
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2578
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Gendy S, Chauhan A, Agarwal M, Pathak A, Rathore RS, Jaswal R. Is Long-Term Heavy Metal Exposure Driving Carriage of Antibiotic Resistance in Environmental Opportunistic Pathogens: A Comprehensive Phenomic and Genomic Assessment Using Serratia sp. SRS-8-S-2018. Front Microbiol 2020; 11:1923. [PMID: 32973703 PMCID: PMC7468404 DOI: 10.3389/fmicb.2020.01923] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 07/21/2020] [Indexed: 12/04/2022] Open
Abstract
The carriage of both, heavy metal and antibiotic resistance appears to be a common trait in bacterial communities native to long-term contaminated habitats, including the Savannah River Site (SRS). There is widespread soil contamination at the SRS; a United States Department of Energy (DOE) facility with long-term contamination from past industrial and nuclear weapons production activities. To further evaluate the genomic and metabolic traits that underpin metal and antibiotic resistance, a robust mercury (Hg) and uranium (U)-resistant strain- SRS-8-S-2018, was isolated. Minimum inhibitory concentration of this strain revealed resistance to Hg (10 μg/ml) and U (5 mM), the two main heavy metal contaminants at the SRS. Metabolic assessment of strain SRS-8-S-2018 using Biolog metabolic fingerprinting analysis revealed preference for carbohydrate utilization followed by polymers, amino acids, carboxy acids, and esters; this physiological activity diminished when Hg stress was provided at 1 and 3 μg/ml and completely ceased at 5 μg/ml Hg, indicating that continued release of Hg will have negative metabolic impacts to even those microorganisms that possess high resistance ability. Development of antibiotic resistance in strain SRS-8-S-2018 was evaluated at a functional level using phenomics, which confirmed broad resistance against 70.8% of the 48 antibiotics tested. Evolutionary and adaptive traits of strain SRS-8-S-2018 were further assessed using genomics, which revealed the strain to taxonomically affiliate with Serratia marcescens species, possessing a genome size of 5,323,630 bp, 5,261 proteins (CDS), 55 genes for transfer RNA (tRNA), and an average G + C content of 59.48. Comparative genomics with closest taxonomic relatives revealed 360 distinct genes in SRS-8-S-2018, with multiple functions related to both, antibiotic and heavy metal resistance, which likely facilitates the strain’s survival in a metalliferous soil habitat. Comparisons drawn between the environmentally isolated Serratia SRS-8-S-2018 with 31 other strains revealed a closer functional association with medically relevant isolates suggesting that propensity of environmental Serratia isolates in acquiring virulence traits, as a function of long-term exposure to heavy metals, which is facilitating development, recruitment and proliferation of not only metal resistant genes (MRGs) but antibiotic resistant genes (ARGs), which can potentially trigger future bacterial pathogen outbreaks emanating from contaminated environmental habitats.
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Affiliation(s)
- Sherif Gendy
- School of Allied Health Sciences, Florida A&M University, Tallahassee, FL, United States
| | - Ashvini Chauhan
- Environmental Biotechnology Laboratory, School of the Environment, FSH Science Research Center, Florida A&M University, Tallahassee, FL, United States
| | - Meenakshi Agarwal
- Environmental Biotechnology Laboratory, School of the Environment, FSH Science Research Center, Florida A&M University, Tallahassee, FL, United States
| | - Ashish Pathak
- Environmental Biotechnology Laboratory, School of the Environment, FSH Science Research Center, Florida A&M University, Tallahassee, FL, United States
| | - Rajesh Singh Rathore
- Environmental Biotechnology Laboratory, School of the Environment, FSH Science Research Center, Florida A&M University, Tallahassee, FL, United States
| | - Rajneesh Jaswal
- Environmental Biotechnology Laboratory, School of the Environment, FSH Science Research Center, Florida A&M University, Tallahassee, FL, United States
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2579
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Harding JF, Zief S, Farb A, Margolis A. Supporting Expectant and Parenting Teens: New Evidence to Inform Future Programming and Research. Matern Child Health J 2020; 24:67-75. [PMID: 32860585 PMCID: PMC7497376 DOI: 10.1007/s10995-020-02996-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Until recently, federal programs had not explicitly focused on improving the outcomes of highly vulnerable teen parents. Established in 2010, the Pregnancy Assistance Fund (PAF) aims to improve the health, social, educational, and economic outcomes for expectant and parenting teens and young adults, their children, and their families, through providing grants to states and tribes. This article introduces the Maternal and Child Health Journal supplement “Supporting Expectant and Parenting Teens: The Pregnancy Assistance Fund,” which draws together the perspectives of researchers and practitioners to provide insights into serving expectant and parenting teens through the PAF program. The articles in the supplement include examples of programs that use different intervention strategies to support teen parents, with programs based in high school, college, and community settings in both urban and rural locations. Some of the articles provide rigorous evidence of what works to support teen parents. In addition, the articles demonstrate key lessons learned from implementation, including allowing some flexibility in implementation while clearly outlining core programmatic components, using partnerships to meet the multifaceted needs of young parents, hiring the right staff and providing extensive training, using strategies for engaging and recruiting teen parents, and planning for sustainability early. The studies use a range of qualitative and quantitative methods to evaluate programs to support teen parents, and three articles describe how to implement innovative and cost effective methods to evaluate these kinds of programs. By summarizing findings across the supplement, we increase understanding of what is known about serving expectant and parenting teens and point to next steps for future research.
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Affiliation(s)
| | - Susan Zief
- Mathematica, P.O. Box 2393, Princeton, NJ, 08543-2393, USA
| | - Amy Farb
- Office of Population Affairs, Washington, DC, USA
| | - Amy Margolis
- Office of Population Affairs, Washington, DC, USA
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2580
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Risk of intussusception after monovalent rotavirus vaccine (Rotavac) in Indian infants: A self-controlled case series analysis. Vaccine 2020; 39:78-84. [PMID: 32972735 PMCID: PMC7738754 DOI: 10.1016/j.vaccine.2020.09.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2020] [Revised: 09/01/2020] [Accepted: 09/03/2020] [Indexed: 11/24/2022]
Abstract
Background An association between rotavirus vaccination and intussusception has been documented in post-licensure studies in some countries. We evaluated the risk of intussusception associated with monovalent rotavirus vaccine (Rotavac) administered at 6, 10 and 14 weeks of age in India. Methods Active prospective surveillance for intussusception was conducted at 22 hospitals across 16 states from April 2016 through September 2017. Data on demography, clinical features and vaccination were documented. Age-adjusted relative incidence for 1–7, 8–21, and 1–21 days after rotavirus vaccination in children aged 28–364 days at intussusception onset was estimated using the self-controlled case-series (SCCS) method. Only Brighton Collaboration level 1 cases were included. Results Out of 670 children aged 2–23 months with intussusception, 311 (46.4%) children were aged 28–364 days with confirmed vaccination status. Out of these, 52 intussusception cases with confirmed receipt of RVV were included in the SCCS analysis. No intussusception case was observed within 21 days of dose 1. Only one case occurred during 8–21 days after the dose 2. Post-dose 3, two cases in 1–7 days and 7 cases during 8–21 days period were observed. There was no increased risk of intussusception during 1–7 days after the doses 1 and 2 (zero cases observed) or dose 3 (relative incidence [RI], 1.71 [95% confidence interval {CI} 0.0–5.11]). Similarly, no increased risk during 8–21 days after the dose 1 (zero cases observed), dose 2 (RI, 0.71 [95% CI, 0.0–3.28]) or dose 3 (RI, 2.52 [95% CI, 0.78–5.61]). The results were similar for 1–21 day periods after the doses separately or pooled. Conclusions The risk of intussusception during the first 21 days after any dose of rotavirus vaccine (Rotavac) was not higher among the Indian infants than the background risk, based on limited SCCS analysis of 52 children.
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2581
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Bach V, Abbiss CR, Libert JP, McCabe SM. Skin Temperatures of Back or Neck Are Better Than Abdomen for Indication of Average Proximal Skin Temperature During Sleep of School-Aged Children. Front Psychiatry 2020; 11:494528. [PMID: 33061911 PMCID: PMC7530240 DOI: 10.3389/fpsyt.2020.494528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/29/2019] [Accepted: 08/31/2020] [Indexed: 11/16/2022] Open
Abstract
PURPOSE The tight association between sleep, body temperature regulation, and patterns of skin temperature change highlights the necessity for accurate and valid assessment of skin temperatures during sleep. With increased interest in this functional relationship in infants and children, it is important to identify where to best measure proximal skin temperature and whether it is possible to reduce the number of sites of measures, in order to limit the experimental effects in natural settings. Thus, the aim of this study was to determine the most suitable single skin temperature sites for representation of average proximal skin temperature during sleep of school aged children. METHODS Statistical analyses were applied to skin temperature data of 22 children, aged 6 to 12 years, measured over four consecutive school nights in their home settings, to compare single site measures of abdomen, back, neck, forehead and subclavicular skin temperatures (local temperatures) with average proximal skin temperatures. RESULTS Abdomen and forehead skin temperatures were significantly different (respectively higher and lower) to the other local proximal temperatures and to average proximal skin temperatures. Moreover, the time pattern of forehead temperature was very different from that of the other local temperatures. CONCLUSIONS Local forehead and abdomen skin temperatures are least suitable as single site representations of average proximal skin temperatures in school aged children when considering both the level and the time course pattern of the temperature across the night. Conversely, back and neck temperatures provide most fitting representation of average proximal skin temperatures.
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Affiliation(s)
- Véronique Bach
- Peritox, UMR_I 01, University of Picardy Jules Verne, Amiens, France
| | - Chris R Abbiss
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia
| | | | - Susan M McCabe
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia
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2582
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Ranjit S, Lanzanò L, Libby AE, Gratton E, Levi M. Advances in fluorescence microscopy techniques to study kidney function. Nat Rev Nephrol 2020; 17:128-144. [PMID: 32948857 DOI: 10.1038/s41581-020-00337-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/30/2020] [Indexed: 02/07/2023]
Abstract
Fluorescence microscopy, in particular immunofluorescence microscopy, has been used extensively for the assessment of kidney function and pathology for both research and diagnostic purposes. The development of confocal microscopy in the 1950s enabled imaging of live cells and intravital imaging of the kidney; however, confocal microscopy is limited by its maximal spatial resolution and depth. More recent advances in fluorescence microscopy techniques have enabled increasingly detailed assessment of kidney structure and provided extraordinary insights into kidney function. For example, nanoscale precise imaging by rapid beam oscillation (nSPIRO) is a super-resolution microscopy technique that was originally developed for functional imaging of kidney microvilli and enables detection of dynamic physiological events in the kidney. A variety of techniques such as fluorescence recovery after photobleaching (FRAP), fluorescence correlation spectroscopy (FCS) and Förster resonance energy transfer (FRET) enable assessment of interaction between proteins. The emergence of other super-resolution techniques, including super-resolution stimulated emission depletion (STED), photoactivated localization microscopy (PALM), stochastic optical reconstruction microscopy (STORM) and structured illumination microscopy (SIM), has enabled functional imaging of cellular and subcellular organelles at ≤50 nm resolution. The deep imaging via emission recovery (DIVER) detector allows deep, label-free and high-sensitivity imaging of second harmonics, enabling assessment of processes such as fibrosis, whereas fluorescence lifetime imaging microscopy (FLIM) enables assessment of metabolic processes.
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Affiliation(s)
- Suman Ranjit
- Department of Biochemistry and Molecular & Cellular Biology, Georgetown University, Washington, DC, USA. .,Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, CA, USA.
| | - Luca Lanzanò
- Nanoscopy and NIC@IIT, Istituto Italiano di Tecnologia, Genoa, Italy.,Department of Physics and Astronomy "Ettore Majorana", University of Catania, Catania, Italy
| | - Andrew E Libby
- Department of Biochemistry and Molecular & Cellular Biology, Georgetown University, Washington, DC, USA
| | - Enrico Gratton
- Laboratory for Fluorescence Dynamics, Department of Biomedical Engineering, University of California, Irvine, CA, USA.
| | - Moshe Levi
- Department of Biochemistry and Molecular & Cellular Biology, Georgetown University, Washington, DC, USA.
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2583
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Laser speckle contrast analysis (LASCA) technology for the semiquantitative measurement of angiogenesis in in-ovo-tumor-model. Microvasc Res 2020; 133:104072. [PMID: 32949573 DOI: 10.1016/j.mvr.2020.104072] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Revised: 08/12/2020] [Accepted: 09/04/2020] [Indexed: 12/17/2022]
Abstract
BACKGROUND The process of angiogenesis is a key element for tumor growth and proliferation and therefore one of the determining factors for aggressiveness and malignancy. A better understanding of the underlying processes of tumor induced angiogenesis is crucial for superior cancer treatment. Furthermore, the PeriCam perfusion speckle imager (PSI) system high resolution (HR) model by PERIMED presents a noninvasive method for semi-quantitative measurement of blood perfusion, based on laser speckle contrast analysis (LASCA). Aim of the present study was to utilize the chick chorioallantoic membrane (CAM) model as an in-ovo-tumor-model which enables rapid neovascularization of tumors while allowing real-time observation of the microcirculation via LASCA. METHODS Fertilized chicken eggs were grafted with embryonal/alveolar rhabdomyosarcoma cells or primary sarcoma tumors. The blood perfusion was measured before and after tumor growth using LASCA. The procedure is accelerated and simplified through the integrated PIMSoft software which provides real-time graphs and color-coded images during the measurement. RESULTS Sarcoma cells and primary sarcoma tumors exhibited satisfactory growth processes on the CAM. LASCA visualized microcirculation accurately and enabled an extensive investigation of the angiogenic potential of sarcoma cells on the CAM. We were able to show that sarcoma cells and primary sarcoma tumors induced larger quantities of neovasculature on the CAM than the controls. CONCLUSIONS The utilization of LASCA for the investigation of tumor angiogenesis within the CAM model appears to be a highly beneficial, cost-efficient and easily practicable procedure. The proposed model can be used as a drug-screening model for individualized cancer therapy, especially with regards to anti-angiogenic agents.
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2584
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Effects of wound dressings containing silver on skin and immune cells. Sci Rep 2020; 10:15216. [PMID: 32939010 PMCID: PMC7494852 DOI: 10.1038/s41598-020-72249-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Accepted: 07/15/2020] [Indexed: 01/18/2023] Open
Abstract
Wound dressings with silver have been shown to be cytotoxic in vitro. However, the extrapolation of this cytotoxicity to clinical settings is unclear. We applied dressings with various forms of silver on porcine skin ex vivo and investigated silver penetration and DNA damage. We assessed antimicrobial efficacy, cytotoxicity to skin cells, and immune response induced by the dressings. All dressings elevated the DNA damage marker γ-H2AX and the expression of stress-related genes in explanted skin relative to control. This corresponded with the amount of silver in the skin. The dressings reduced viability, induced oxidative stress and DNA damage in skin cells, and induced the production of pro-inflammatory IL-6 by monocytes. The oxidative burst and viability of activated neutrophils decreased. The amount of silver released into the culture medium varied among the dressings and correlated with in vitro toxicity. However, antimicrobial efficiencies did not correlate strongly with the amount of silver released from the dressings. Antimicrobial efficiency and toxicity are driven by the form of silver and the construction of dressings and not only by the silver concentration. The damaging effects of silver dressings in ex vivo skin highlight the importance of thorough in vivo investigation of silver dressing toxicity.
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2585
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Sørensen PE, Van Den Broeck W, Kiil K, Jasinskyte D, Moodley A, Garmyn A, Ingmer H, Butaye P. New insights into the biodiversity of coliphages in the intestine of poultry. Sci Rep 2020; 10:15220. [PMID: 32939020 PMCID: PMC7494930 DOI: 10.1038/s41598-020-72177-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Accepted: 08/27/2020] [Indexed: 12/26/2022] Open
Abstract
Despite phages' ubiquitous presence and great importance in shaping microbial communities, little is known about the diversity of specific phages in different ecological niches. Here, we isolated, sequenced, and characterized 38 Escherichia coli-infecting phages (coliphages) from poultry faeces to gain a better understanding of the coliphage diversity in the poultry intestine. All phages belonged to either the Siphoviridae or Myoviridae family and their genomes ranged between 44,324 and 173,384 bp, with a G+C content between 35.5 and 46.4%. Phylogenetic analysis was performed based on single "marker" genes; the terminase large subunit, portal protein, and exonucleases, as well as the full draft genomes. Single gene analysis resulted in six distinct clusters. Only minor differences were observed between the different phylogenetic analyses, including branch lengths and additional duplicate or triplicate subclustering. Cluster formation was according to genome size, G+C content and phage subfamily. Phylogenetic analysis based on the full genomes supported these clusters. Moreover, several of our Siphoviridae phages might represent a novel unclassified phage genus. This study allowed for identification of several novel coliphages and provides new insights to the coliphage diversity in the intestine of poultry. Great diversity was observed amongst the phages, while they were isolated from an otherwise similar ecosystem.
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Affiliation(s)
- Patricia E Sørensen
- Department of Pathology, Bacteriology and Poultry Diseases, Ghent University, Merelbeke, Belgium.
- Department of Biomedical Sciences, Ross University School of Veterinary Medicine, Basseterre, Saint Kitts and Nevis.
| | | | - Kristoffer Kiil
- Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Dziuginta Jasinskyte
- Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg C, Denmark
| | - Arshnee Moodley
- Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg C, Denmark
- CGIAR Antimicrobial Resistance Hub, International Livestock Research Institute, Nairobi, Kenya
| | - An Garmyn
- Department of Pathology, Bacteriology and Poultry Diseases, Ghent University, Merelbeke, Belgium
| | - Hanne Ingmer
- Department of Veterinary and Animal Sciences, University of Copenhagen, Frederiksberg C, Denmark
| | - Patrick Butaye
- Department of Pathology, Bacteriology and Poultry Diseases, Ghent University, Merelbeke, Belgium
- Department of Biomedical Sciences, Ross University School of Veterinary Medicine, Basseterre, Saint Kitts and Nevis
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2586
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Gaba A, Wang H, Qu X. An In Vitro Single-Molecule Imaging Assay for the Analysis of Cap-Dependent Translation Kinetics. J Vis Exp 2020. [PMID: 33016943 DOI: 10.3791/61648] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Cap-dependent protein synthesis is the predominant translation pathway in eukaryotic cells. While various biochemical and genetic approaches have allowed extensive studies of cap-dependent translation and its regulation, high resolution kinetic characterization of this translation pathway is still lacking. Recently, we developed an in vitro assay to measure cap-dependent translation kinetics with single-molecule resolution. The assay is based on fluorescently labeled antibody binding to nascent epitope-tagged polypeptide. By imaging the binding and dissociation of antibodies to and from nascent peptide-ribosome-mRNA complexes, the translation progression on individual mRNAs can be tracked. Here, we present a protocol for establishing this assay, including mRNA and PEGylated slide preparations, real-time imaging of translation, and analysis of single molecule trajectories. This assay enables tracking of individual cap-dependent translation events and resolves key translation kinetics, such as initiation and elongation rates. The assay can be widely applied to distinct translation systems and should broadly benefit in vitro studies of cap-dependent translation kinetics and translational control mechanisms.
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Affiliation(s)
- Anthony Gaba
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center
| | - Hongyun Wang
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center
| | - Xiaohui Qu
- Molecular Biology Program, Memorial Sloan Kettering Cancer Center;
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2587
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Kaspar F, Giessmann RT, Westarp S, Hellendahl KF, Krausch N, Thiele I, Walczak MC, Neubauer P, Wagner A. Spectral Unmixing-Based Reaction Monitoring of Transformations between Nucleosides and Nucleobases. Chembiochem 2020; 21:2604-2610. [PMID: 32324971 PMCID: PMC7540295 DOI: 10.1002/cbic.202000204] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 04/21/2020] [Indexed: 11/10/2022]
Abstract
The increased interest in (enzymatic) transformations between nucleosides and nucleobases has demanded the development of efficient analytical tools. In this report, we present an update and extension of our recently described method for monitoring these reactions by spectral unmixing. The presented method uses differences in the UV absorption spectra of nucleosides and nucleobases after alkaline quenching to derive their ratio based on spectral shape by fitting normalized reference spectra. It is applicable to a broad compound spectrum comprising more than 35 examples, offers HPLC-like accuracy, ease of handling and significant reductions in both cost and data acquisition time compared to other methods. This contribution details the principle of monitoring reactions by spectral unmixing, gives recommendations regarding solutions to common problems and applications that necessitate special sample treatment. We provide software, workflows and reference spectra that facilitate the straightforward and versatile application of the method.
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Affiliation(s)
- Felix Kaspar
- Institute of Biotechnology, Chair of Bioprocess EngineeringTechnische Universität Berlin ACK 24Ackerstraße 7613355BerlinGermany
- BioNukleo GmbHAckerstraße 7613355BerlinGermany
| | - Robert T. Giessmann
- Institute of Biotechnology, Chair of Bioprocess EngineeringTechnische Universität Berlin ACK 24Ackerstraße 7613355BerlinGermany
| | - Sarah Westarp
- Institute of Biotechnology, Chair of Bioprocess EngineeringTechnische Universität Berlin ACK 24Ackerstraße 7613355BerlinGermany
- BioNukleo GmbHAckerstraße 7613355BerlinGermany
| | - Katja F. Hellendahl
- Institute of Biotechnology, Chair of Bioprocess EngineeringTechnische Universität Berlin ACK 24Ackerstraße 7613355BerlinGermany
| | - Niels Krausch
- Institute of Biotechnology, Chair of Bioprocess EngineeringTechnische Universität Berlin ACK 24Ackerstraße 7613355BerlinGermany
| | - Isabel Thiele
- Institute of Biotechnology, Chair of Bioprocess EngineeringTechnische Universität Berlin ACK 24Ackerstraße 7613355BerlinGermany
| | - Miriam C. Walczak
- Institute of Biotechnology, Chair of Bioprocess EngineeringTechnische Universität Berlin ACK 24Ackerstraße 7613355BerlinGermany
- BioNukleo GmbHAckerstraße 7613355BerlinGermany
| | - Peter Neubauer
- Institute of Biotechnology, Chair of Bioprocess EngineeringTechnische Universität Berlin ACK 24Ackerstraße 7613355BerlinGermany
| | - Anke Wagner
- Institute of Biotechnology, Chair of Bioprocess EngineeringTechnische Universität Berlin ACK 24Ackerstraße 7613355BerlinGermany
- BioNukleo GmbHAckerstraße 7613355BerlinGermany
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2588
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Norris JM, Simpson BS, Freeman A, Kirkham A, Whitaker HC, Emberton M. Conspicuity of prostate cancer on multiparametric magnetic resonance imaging: A cross-disciplinary translational hypothesis. FASEB J 2020; 34:14150-14159. [PMID: 32920937 PMCID: PMC8436756 DOI: 10.1096/fj.202001466r] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 08/03/2020] [Accepted: 08/24/2020] [Indexed: 11/11/2022]
Abstract
Pre-biopsy multiparametric magnetic resonance imaging (mpMRI) has transformed the risk stratification and diagnostic approach for suspected prostate cancer. The majority of clinically significant prostate cancers are visible on pre-biopsy mpMRI, however, there are a subset of significant tumors that are not detected by mpMRI. The radiobiological mechanisms underpinning mpMRI-visibility and invisibility of these cancers remain uncertain. Emerging evidence suggests that mpMRI-visible tumors are enriched with molecular features associated with increased disease aggressivity and poor clinical prognosis, which is supported by short-term endpoints, such as biochemical recurrence following surgery. Furthermore, at the histopathological level, mpMRI-visible tumors appear to exhibit increased architectural and vascular density compared to mpMRI-invisible disease. It seems probable that the genomic, pathological, radiological, and clinical features of mpMRI-visible and mpMRI-invisible prostate cancers are interrelated. Here, we propose a novel cross-disciplinary theory that links genomic and molecular evidence with cellular and histopathological appearances, elucidating both the mpMRI visibility and clinical status of significant prostate cancer.
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Affiliation(s)
- Joseph M Norris
- UCL Division of Surgery & Interventional Science, University College London, London, UK.,Department of Urology, University College London Hospitals NHS Foundation Trust, London, UK
| | - Benjamin S Simpson
- UCL Division of Surgery & Interventional Science, University College London, London, UK
| | - Alex Freeman
- Department of Pathology, University College London Hospitals NHS Foundation Trust, London, UK
| | - Alex Kirkham
- Department of Radiology, University College London Hospitals NHS Foundation Trust, London, UK
| | - Hayley C Whitaker
- UCL Division of Surgery & Interventional Science, University College London, London, UK
| | - Mark Emberton
- UCL Division of Surgery & Interventional Science, University College London, London, UK.,Department of Urology, University College London Hospitals NHS Foundation Trust, London, UK
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2589
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Siamoglou S, Karamperis K, Mitropoulou C, Patrinos GP. Costing Methods as a Means to Measure the Costs of Pharmacogenomics Testing. J Appl Lab Med 2020; 5:1005-1016. [PMID: 32916714 DOI: 10.1093/jalm/jfaa113] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 06/24/2020] [Indexed: 12/26/2022]
Abstract
Clinical implementation of pharmacogenomics and personalized medicine interventions relies on addressing important financial aspects of the delivery of genetic testing to the patients, be it from public or private providers. Details on how to determine the cost items of the genetic testing are often limited. The goal of this study is to present a costing methodology in order to estimate and measure the costs as far as the technical process of pharmacogenomics testing is concerned. Moreover, an overall cost mindset strategy based on the selective genotyping workflow to guide specialized laboratories of interest effectively is provided. We particularly accounted for the resources consumed within the laboratory premises such as cost of reagents for DNA isolation, cost of consumables, cost of personnel, while costs associated with patient recruitment, blood sample collection and maintenance, administration costs in the hospital, and costs of blood sample shipment were not taken into consideration. Our article presents the first-time detailed information on a costing framework for pharmacogenomic testing that could be employed to laboratories involved in routine clinical implementation of pharmacogenomics.
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Affiliation(s)
- Stavroula Siamoglou
- Laboratory of Pharmacogenomics and Individualized Therapy, Department of Pharmacy, School of Health Sciences, University of Patras, Patras, Greece
| | - Kariofyllis Karamperis
- Laboratory of Pharmacogenomics and Individualized Therapy, Department of Pharmacy, School of Health Sciences, University of Patras, Patras, Greece.,The Golden Helix Foundation, London, UK
| | | | - George P Patrinos
- Laboratory of Pharmacogenomics and Individualized Therapy, Department of Pharmacy, School of Health Sciences, University of Patras, Patras, Greece.,Department of Pathology, College of Medicine and Health Sciences, United Arab Emirates University, Al-Ain, Abu Dhabi, UAE.,Zayed Center of Health Sciences, United Arab Emirates University, Al-Ain, Abu Dhabi, UAE
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2590
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Use of in vitro bone models to screen for altered bone metabolism, osteopathies, and fracture healing: challenges of complex models. Arch Toxicol 2020; 94:3937-3958. [PMID: 32910238 PMCID: PMC7655582 DOI: 10.1007/s00204-020-02906-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Accepted: 09/03/2020] [Indexed: 02/06/2023]
Abstract
Approx. every third hospitalized patient in Europe suffers from musculoskeletal injuries or diseases. Up to 20% of these patients need costly surgical revisions after delayed or impaired fracture healing. Reasons for this are the severity of the trauma, individual factors, e.g, the patients’ age, individual lifestyle, chronic diseases, medication, and, over 70 diseases that negatively affect the bone quality. To investigate the various disease constellations and/or develop new treatment strategies, many in vivo, ex vivo, and in vitro models can be applied. Analyzing these various models more closely, it is obvious that many of them have limits and/or restrictions. Undoubtedly, in vivo models most completely represent the biological situation. Besides possible species-specific differences, ethical concerns may question the use of in vivo models especially for large screening approaches. Challenging whether ex vivo or in vitro bone models can be used as an adequate replacement for such screenings, we here summarize the advantages and challenges of frequently used ex vivo and in vitro bone models to study disturbed bone metabolism and fracture healing. Using own examples, we discuss the common challenge of cell-specific normalization of data obtained from more complex in vitro models as one example of the analytical limits which lower the full potential of these complex model systems.
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2591
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Comparison of High- and Low-LET Radiation-Induced DNA Double-Strand Break Processing in Living Cells. Int J Mol Sci 2020; 21:ijms21186602. [PMID: 32917044 PMCID: PMC7555951 DOI: 10.3390/ijms21186602] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Revised: 08/26/2020] [Accepted: 09/06/2020] [Indexed: 12/11/2022] Open
Abstract
High-linear-energy-transfer (LET) radiation is more lethal than similar doses of low-LET radiation types, probably a result of the condensed energy deposition pattern of high-LET radiation. Here, we compare high-LET α-particle to low-LET X-ray irradiation and monitor double-strand break (DSB) processing. Live-cell microscopy was used to monitor DNA double-strand breaks (DSBs), marked by p53-binding protein 1 (53BP1). In addition, the accumulation of the endogenous 53BP1 and replication protein A (RPA) DSB processing proteins was analyzed by immunofluorescence. In contrast to α-particle-induced 53BP1 foci, X-ray-induced foci were resolved quickly and more dynamically as they showed an increase in 53BP1 protein accumulation and size. In addition, the number of individual 53BP1 and RPA foci was higher after X-ray irradiation, while focus intensity was higher after α-particle irradiation. Interestingly, 53BP1 foci induced by α-particles contained multiple RPA foci, suggesting multiple individual resection events, which was not observed after X-ray irradiation. We conclude that high-LET α-particles cause closely interspaced DSBs leading to high local concentrations of repair proteins. Our results point toward a change in DNA damage processing toward DNA end-resection and homologous recombination, possibly due to the depletion of soluble protein in the nucleoplasm. The combination of closely interspaced DSBs and perturbed DNA damage processing could be an explanation for the increased relative biological effectiveness (RBE) of high-LET α-particles compared to X-ray irradiation.
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2592
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Crawford K, Diaz Quiroz JF, Koenig KM, Ahuja N, Albertin CB, Rosenthal JJC. Highly Efficient Knockout of a Squid Pigmentation Gene. Curr Biol 2020; 30:3484-3490.e4. [PMID: 32735817 PMCID: PMC7484294 DOI: 10.1016/j.cub.2020.06.099] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Revised: 06/24/2020] [Accepted: 06/29/2020] [Indexed: 12/15/2022]
Abstract
Seminal studies using squid as a model led to breakthroughs in neurobiology. The squid giant axon and synapse, for example, laid the foundation for our current understanding of the action potential [1], ionic gradients across cells [2], voltage-dependent ion channels [3], molecular motors [4-7], and synaptic transmission [8-11]. Despite their anatomical advantages, the use of squid as a model receded over the past several decades as investigators turned to genetically tractable systems. Recently, however, two key advances have made it possible to develop techniques for the genetic manipulation of squid. The first is the CRISPR-Cas9 system for targeted gene disruption, a largely species-agnostic method [12, 13]. The second is the sequencing of genomes for several cephalopod species [14-16]. If made genetically tractable, squid and other cephalopods offer a wealth of biological novelties that could spur discovery. Within invertebrates, not only do they possess by far the largest brains, they also express the most sophisticated behaviors [17]. In this paper, we demonstrate efficient gene knockout in the squid Doryteuthis pealeii using CRISPR-Cas9. Ommochromes, the pigments found in squid retinas and chromatophores, are derivatives of tryptophan, and the first committed step in their synthesis is normally catalyzed by Tryptophan 2,3 Dioxygenase (TDO [18-20]). Knocking out TDO in squid embryos efficiently eliminated pigmentation. By precisely timing CRISPR-Cas9 delivery during early development, the degree of pigmentation could be finely controlled. Genotyping revealed knockout efficiencies routinely greater than 90%. This study represents a critical advancement toward making squid genetically tractable.
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Affiliation(s)
- Karen Crawford
- Biology Department, St. Mary's College of Maryland, 18952 E. Fisher Road, St. Mary's City, MD 20650, USA; The Eugene Bell Center, The Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA 02543, USA
| | - Juan F Diaz Quiroz
- The Eugene Bell Center, The Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA 02543, USA
| | - Kristen M Koenig
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 01451, USA; John Harvard Distinguished Science Fellowship Program, Harvard University, Cambridge, MA 01451, USA
| | - Namrata Ahuja
- The Eugene Bell Center, The Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA 02543, USA
| | - Caroline B Albertin
- The Eugene Bell Center, The Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA 02543, USA
| | - Joshua J C Rosenthal
- The Eugene Bell Center, The Marine Biological Laboratory, 7 MBL Street, Woods Hole, MA 02543, USA.
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2593
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Madsen A, Höppner G, Krause J, Hirt MN, Laufer SD, Schweizer M, Tan WLW, Mosqueira D, Anene-Nzelu CG, Lim I, Foo RSY, Eschenhagen T, Stenzig J. An Important Role for DNMT3A-Mediated DNA Methylation in Cardiomyocyte Metabolism and Contractility. Circulation 2020; 142:1562-1578. [PMID: 32885664 PMCID: PMC7566310 DOI: 10.1161/circulationaha.119.044444] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Supplemental Digital Content is available in the text. Background: DNA methylation acts as a mechanism of gene transcription regulation. It has recently gained attention as a possible therapeutic target in cardiac hypertrophy and heart failure. However, its exact role in cardiomyocytes remains controversial. Thus, we knocked out the main de novo DNA methyltransferase in cardiomyocytes, DNMT3A, in human induced pluripotent stem cells. Functional consequences of DNA methylation-deficiency under control and stress conditions were then assessed in human engineered heart tissue from knockout human induced pluripotent stem cell–derived cardiomyocytes. Methods: DNMT3A was knocked out in human induced pluripotent stem cells by CRISPR/Cas9gene editing. Fibrin-based engineered heart tissue was generated from knockout and control human induced pluripotent stem cell–derived cardiomyocytes. Development and baseline contractility were analyzed by video-optical recording. Engineered heart tissue was subjected to different stress protocols, including serum starvation, serum variation, and restrictive feeding. Molecular, histological, and ultrastructural analyses were performed afterward. Results: Knockout of DNMT3A in human cardiomyocytes had three main consequences for cardiomyocyte morphology and function: (1) Gene expression changes of contractile proteins such as higher atrial gene expression and lower MYH7/MYH6 ratio correlated with different contraction kinetics in knockout versus wild-type; (2) Aberrant activation of the glucose/lipid metabolism regulator peroxisome proliferator-activated receptor gamma was associated with accumulation of lipid vacuoles within knockout cardiomyocytes; (3) Hypoxia-inducible factor 1α protein instability was associated with impaired glucose metabolism and lower glycolytic enzyme expression, rendering knockout-engineered heart tissue sensitive to metabolic stress such as serum withdrawal and restrictive feeding. Conclusion: The results suggest an important role of DNA methylation in the normal homeostasis of cardiomyocytes and during cardiac stress, which could make it an interesting target for cardiac therapy.
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Affiliation(s)
- Alexandra Madsen
- Institute of Experimental Pharmacology and Toxicology (A.M., G.H., M.N.H., S.D.L., T.E., J.S.), University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany (A.M., G.H., J.K., M.N.H., S.D.L., T.E., J.S.)
| | - Grit Höppner
- Institute of Experimental Pharmacology and Toxicology (A.M., G.H., M.N.H., S.D.L., T.E., J.S.), University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany (A.M., G.H., J.K., M.N.H., S.D.L., T.E., J.S.)
| | - Julia Krause
- DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany (A.M., G.H., J.K., M.N.H., S.D.L., T.E., J.S.).,Department of Cardiology, University Heart and Vascular Center Hamburg, Germany (J.K.)
| | - Marc N Hirt
- Institute of Experimental Pharmacology and Toxicology (A.M., G.H., M.N.H., S.D.L., T.E., J.S.), University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany (A.M., G.H., J.K., M.N.H., S.D.L., T.E., J.S.)
| | - Sandra D Laufer
- Institute of Experimental Pharmacology and Toxicology (A.M., G.H., M.N.H., S.D.L., T.E., J.S.), University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany (A.M., G.H., J.K., M.N.H., S.D.L., T.E., J.S.)
| | - Michaela Schweizer
- Department of Morphology and Electron Microscopy, Center for Molecular Neurobiology (M.S.), University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | | | - Diogo Mosqueira
- Division of Cancer & Stem Cells, Biodiscovery Institute, University of Nottingham, United Kingdom (D.M.)
| | - Chukwuemeka George Anene-Nzelu
- Genome Institute of Singapore (W.L.W.T., C.G.A.-N., I.L., R.S.Y.F.).,Cardiovascular Research Institute, National University of Singapore (C.G.A.-N., I.L., R.S.Y.F.)
| | - Ives Lim
- Genome Institute of Singapore (W.L.W.T., C.G.A.-N., I.L., R.S.Y.F.)
| | - Roger S Y Foo
- Genome Institute of Singapore (W.L.W.T., C.G.A.-N., I.L., R.S.Y.F.).,Cardiovascular Research Institute, National University of Singapore (C.G.A.-N., I.L., R.S.Y.F.)
| | - Thomas Eschenhagen
- Institute of Experimental Pharmacology and Toxicology (A.M., G.H., M.N.H., S.D.L., T.E., J.S.), University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany (A.M., G.H., J.K., M.N.H., S.D.L., T.E., J.S.)
| | - Justus Stenzig
- Institute of Experimental Pharmacology and Toxicology (A.M., G.H., M.N.H., S.D.L., T.E., J.S.), University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,DZHK (German Centre for Cardiovascular Research), partner site Hamburg/Kiel/Lübeck, Hamburg, Germany (A.M., G.H., J.K., M.N.H., S.D.L., T.E., J.S.)
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2594
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Hölzl-Armstrong L, Kucab JE, Moody S, Zwart EP, Loutkotová L, Duffy V, Luijten M, Gamboa da Costa G, Stratton MR, Phillips DH, Arlt VM. Mutagenicity of acrylamide and glycidamide in human TP53 knock-in (Hupki) mouse embryo fibroblasts. Arch Toxicol 2020; 94:4173-4196. [PMID: 32886187 PMCID: PMC7655573 DOI: 10.1007/s00204-020-02878-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 08/12/2020] [Indexed: 11/30/2022]
Abstract
Acrylamide is a suspected human carcinogen formed during high-temperature cooking of starch-rich foods. It is metabolised by cytochrome P450 2E1 to its reactive metabolite glycidamide, which forms pre-mutagenic DNA adducts. Using the human TP53 knock-in (Hupki) mouse embryo fibroblasts (HUFs) immortalisation assay (HIMA), acrylamide- and glycidamide-induced mutagenesis was studied in the tumour suppressor gene TP53. Selected immortalised HUF clones were also subjected to next-generation sequencing to determine mutations across the whole genome. The TP53-mutant frequency after glycidamide exposure (1.1 mM for 24 h, n = 198) was 9% compared with 0% in cultures treated with acrylamide [1.5 (n = 24) or 3 mM (n = 6) for 48 h] and untreated vehicle (water) controls (n = 36). Most glycidamide-induced mutations occurred at adenines with A > T/T > A and A > G/T > C mutations being the most common types. Mutations induced by glycidamide occurred at specific TP53 codons that have also been found to be mutated in human tumours (i.e., breast, ovary, colorectal, and lung) previously associated with acrylamide exposure. The spectrum of TP53 mutations was further reflected by the mutations detected by whole-genome sequencing (WGS) and a distinct WGS mutational signature was found in HUF clones treated with glycidamide that was again characterised by A > G/T > C and A > T/T > A mutations. The WGS mutational signature showed similarities with COSMIC mutational signatures SBS3 and 25 previously found in human tumours (e.g., breast and ovary), while the adenine component was similar to COSMIC SBS4 found mostly in smokers’ lung cancer. In contrast, in acrylamide-treated HUF clones, only culture-related background WGS mutational signatures were observed. In summary, the results of the present study suggest that glycidamide may be involved in the development of breast, ovarian, and lung cancer.
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Affiliation(s)
- Lisa Hölzl-Armstrong
- Department of Analytical, Environmental and Forensic Sciences, MRC-PHE Centre for Environment and Health, King's College London, London, SE1 9NH, UK
| | - Jill E Kucab
- Department of Analytical, Environmental and Forensic Sciences, MRC-PHE Centre for Environment and Health, King's College London, London, SE1 9NH, UK
| | - Sarah Moody
- Cancer, Ageing and Somatic Mutation, Wellcome Trust Sanger Institute, Hinxton, CB10 1SA, UK
| | - Edwin P Zwart
- Center for Health Protection, National Institute for Public Health and the Environment (RIVM), Bilthoven, 3720, The Netherlands
| | - Lucie Loutkotová
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR, 72079, USA.,Covance Inc., Salt Lake City, Utah, 84124, USA
| | - Veronica Duffy
- Department of Analytical, Environmental and Forensic Sciences, MRC-PHE Centre for Environment and Health, King's College London, London, SE1 9NH, UK
| | - Mirjam Luijten
- Center for Health Protection, National Institute for Public Health and the Environment (RIVM), Bilthoven, 3720, The Netherlands
| | - Gonçalo Gamboa da Costa
- Division of Biochemical Toxicology, National Center for Toxicological Research, U.S. Food and Drug Administration, Jefferson, AR, 72079, USA
| | - Michael R Stratton
- Cancer, Ageing and Somatic Mutation, Wellcome Trust Sanger Institute, Hinxton, CB10 1SA, UK
| | - David H Phillips
- Department of Analytical, Environmental and Forensic Sciences, MRC-PHE Centre for Environment and Health, King's College London, London, SE1 9NH, UK
| | - Volker M Arlt
- Department of Analytical, Environmental and Forensic Sciences, MRC-PHE Centre for Environment and Health, King's College London, London, SE1 9NH, UK. .,Toxicology Department, GAB Consulting GmbH, 69126, Heidelberg, Germany.
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2595
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Cell-free styrene biosynthesis at high titers. Metab Eng 2020; 61:89-95. [DOI: 10.1016/j.ymben.2020.05.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 05/13/2020] [Accepted: 05/25/2020] [Indexed: 11/18/2022]
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2596
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Wu Y, Cao Y, Liu H, Yao M, Ma N, Zhang B. Remodelin, an inhibitor of NAT10, could suppress hypoxia-induced or constitutional expression of HIFs in cells. Mol Cell Biochem 2020; 472:19-31. [PMID: 32529496 DOI: 10.1007/s11010-020-03776-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2020] [Accepted: 05/31/2020] [Indexed: 01/12/2023]
Abstract
Hypoxia-inducible factors (HIFs) are key mediators expressed under hypoxic condition and involved in many kinds of disease such as cancer and abnormal angiogenesis. Thus, development of their inhibitor has been extensively explored. Here, we describe a finding that Remodelin, a specific inhibitor of NAT10, could also inhibit the expression of HIFs. The presence of Remodelin could suppress the elevated level of HIF-1α protein and its nuclear translocation induced by either treatment of cobalt chloride (CoCl2) or hypoxia in dose or time-dependent way. More importantly, Remodelin could also inhibit the constitutional expression of HIF-1α and HIF-2α in VHL mutant 786-0 cells. With using of cells with depletion of NAT10 by shRNA or Crispr-Cas9 edited, we further demonstrated that inhibition of HIFs by Remodelin should need NAT10 activity. In biological analysis, the treatment of cultured HUVECs with Remodelin could inhibit in vitro cell migration and invasion and tube-formation. Our investigation implied that Remodelin could be a new potential inhibitor of HIFs for using in angiogenesis targeting therapy in either cancers or inflammatory diseases.
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Affiliation(s)
- Yaqian Wu
- Department of Pathology, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Haidian District, Beijing, 100191, China
| | - Yanan Cao
- Department of Pathology, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Haidian District, Beijing, 100191, China
| | - Haijing Liu
- Department of Pathology, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Haidian District, Beijing, 100191, China
| | - Mengfei Yao
- Department of Pathology, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Haidian District, Beijing, 100191, China
| | - Ningning Ma
- Department of Pathology, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Haidian District, Beijing, 100191, China
| | - Bo Zhang
- Department of Pathology, School of Basic Medical Sciences, Peking University Health Science Center, 38 Xueyuan Road, Haidian District, Beijing, 100191, China.
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2597
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Geraldes V, Jacinavicius FR, Genuário DB, Pinto E. Identification and distribution of mycosporine-like amino acids in Brazilian cyanobacteria using ultrahigh-performance liquid chromatography with diode array detection coupled to quadrupole time-of-flight mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2020; 34 Suppl 3:e8634. [PMID: 31677357 DOI: 10.1002/rcm.8634] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Revised: 09/13/2019] [Accepted: 10/09/2019] [Indexed: 06/10/2023]
Abstract
RATIONALE Mycosporine-like amino acids (MAAs) are UV-absorbing compounds produced by fungi, algae, lichens, and cyanobacteria when exposed to UV radiation. These compounds have photoprotective and antioxidant functions and have been widely studied for possible use in sunscreens and anti-aging products. This study aims to identify MAA-producing cyanobacteria with potential application in cosmetics. METHODS A method for the identification of MAAs was developed using ultrahigh-performance liquid chromatography with diode array detection coupled to quadrupole time-of-flight mass spectrometry (UHPLC-DAD/QTOFMS). Chromatographic separation was carried out using a Synergi 4 μ Hydro-RP 80A column (150 × 2,0 mm) at 30°C with 0.1% formic acid aqueous solution + 2 mM ammonium formate and acetonitrile/water (8:2) + 0.1% formic acid as a mobile phase. RESULTS Out of the 69 cyanobacteria studied, 26 strains (37%) synthesized MAAs. Nine different MAAs were identified using UHPLC-DAD/QTOFMS. Iminomycosporines were the major group detected (7 in 9 MAAs). In terms of abundance, the most representative genera for MAA production were heterocyte-forming groups. Oscilatoria sp. CMMA 1600, of homocyte type, produced the greatest diversity of MAAs. CONCLUSIONS The UHPLC-DAD/QTOFMS method is a powerful tool for identification and screening of MAAs in cyanobacterial strains as well as in other organisms such as dinoflagellates, macroalgae, and microalgae. The different cyanobacterial genera isolated from diverse Brazilian biomes and environments are prolific sources of MAAs.
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Affiliation(s)
- Vanessa Geraldes
- Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, SP, Brazil
| | | | | | - Ernani Pinto
- Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, SP, Brazil
- Centre for Nuclear Energy in Agriculture, University of São Paulo, Piracicaba, SP, Brazil
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2598
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Xu X, Chen J, Zhang B, Huang L, Zheng Y, Si K, Duan S, Gong W. Enlarged field of view based on Schwartz modulation for light sheet fluorescence microscopy in deep tissue. OPTICS LETTERS 2020; 45:4851-4854. [PMID: 32870874 DOI: 10.1364/ol.398985] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Accepted: 07/26/2020] [Indexed: 06/11/2023]
Abstract
The combination of light sheet fluorescence microscopy (LSFM) and the optical clearing method can achieve fast three-dimensional high-resolution imaging. However, there is an essential contradiction between the field of view (FoV) and spatial resolution. Also, aberration and scattering still exist after tissue clearing, which seriously limits the imaging depth of LSFM. Here we propose a Schwartz modulation method and implement it in LSFM based on a quasi-Bessel beam to enlarge the imaging FoV without sacrificing its spatial resolution. The simulation results show that the FoV of the LSFM is enlarged by a factor of 1.73 compared to the Bessel beam. The capability of extremely fast decay along the optical axis makes Schwartz modulation more tolerant for scattering, indicating potential applications for deep tissue imaging. Also, the capability of sidelobe suppression effectively decreases unnecessary fluorescence excitation and photobleaching.
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2599
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Prospective surveillance for intussusception in Indian children aged under two years at nineteen tertiary care hospitals. BMC Pediatr 2020; 20:413. [PMID: 32873281 PMCID: PMC7461288 DOI: 10.1186/s12887-020-02293-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 08/12/2020] [Indexed: 11/16/2022] Open
Abstract
Background India introduced rotavirus vaccines (RVV, monovalent, Rotavac™ and pentavalent, Rotasiil™) in April 2016 with 6, 10 and 14 weeks schedule and expanded countrywide in phases. We describe the epidemiology of intussusception among children aged 2–23 months in India. Methods The prospective surveillance at 19 nationally representative sentinel hospitals from four regions recruited children with intussusception from April 2016 to September 2017. Data on sociodemography, immunization, clinical, treatment and outcome were collected. Along with descriptive analysis, key parameters between four regions were compared using Chi-Square/Fisher’s exact/Mann–Whitney U/Kruskal-Wallis tests. The pre- and post-RVV periods were compared to estimate the risk ratios. Results Six hundred twenty-one children with intussusception from South (n = 262), East (n = 190), North (n = 136) and West (n = 33) regions were recruited. Majority (n = 465, 74.8%) were infants (40.0% aged 4–7 months) with median age 8 months (IQR 5, 13 months), predominantly males (n = 408, 65.7%) and half (n = 311, 50.0%) occurred during March–June months. A shorter interval between weaning and intussusception was observed for ragi based food (median 1 month, IQR 0–4.2 months) compared to rice (median 4 months, IQR 1–9 months) and wheat (median 3 months, IQR 1–7 months) based food (p < 0.01). Abdominal pain or excessive crying (82.8%), vomiting (72.6%), and bloody stool (58.1%) were the leading symptoms. Classical triad (abdominal pain, vomiting and bloody stool) was observed in 34.8% cases (24.4 to 45.8% across regions). 95.3% of the cases were diagnosed by ultrasound. 49.3% (10.5 to 82.4% across regions) cases were managed by reduction, 39.5% (11.5 to 71.1% across regions) cases underwent surgery and 11.1% spontaneously resolved. Eleven (1.8%) cases died. 89.1% cases met Brighton criteria level 1 and 7.6% met Level 2. RVV was received by 12 cases within 1–21 days prior to intussusception. No increase in case load (RR = 0.44; 95% CI 0.22–1.18) or case ratio (RR = 0.5; 95% CI 0.3–1.2) was observed after RVV introduction in select sites. Conclusions Intussusception cases were observed across all sites, although there were variations in cases, presentation and mode of management. The high case load age coincided with age of the RVV third dose. The association with ragi based weaning food in intussusception needs further evaluation.
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2600
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Cheng F, Luk AO, Tam CHT, Fan B, Wu H, Yang A, Lau ESH, Ng ACW, Lim CKP, Lee HM, Chow E, Kong AP, Keech AC, Joglekar MV, So WY, Jenkins AJ, Chan JCN, Hardikar AA, Ma RCW. Shortened Relative Leukocyte Telomere Length Is Associated With Prevalent and Incident Cardiovascular Complications in Type 2 Diabetes: Analysis From the Hong Kong Diabetes Register. Diabetes Care 2020; 43:2257-2265. [PMID: 32661111 DOI: 10.2337/dc20-0028] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2020] [Accepted: 06/12/2020] [Indexed: 02/03/2023]
Abstract
OBJECTIVE Several studies support potential links between relative leukocyte telomere length (rLTL), a biomarker of biological aging, and type 2 diabetes. This study investigates relationships between rLTL and incident cardiovascular disease (CVD) in patients with type 2 diabetes. RESEARCH DESIGN AND METHODS Consecutive Chinese patients with type 2 diabetes (N = 5,349) from the Hong Kong Diabetes Register for whom DNA obtained at baseline was stored and follow-up data were available were studied. rLTL was measured by using quantitative PCR. CVD was diagnosed on the basis of ICD-9 code. RESULTS Mean follow-up was 13.4 years (SD 5.5 years). rLTL was correlated inversely with age, diabetes duration, blood pressure, HbA1c, and urine albumin-to-creatinine ratio (ACR), and positively with estimated glomerular filtration rate (eGFR) (all P < 0.001). Subjects with CVD at baseline had a shorter rLTL (4.3 ± 1.2 ΔΔCt) than did subjects without CVD (4.6 ± 1.2 ΔΔCt) (P < 0.001). Of the 4,541 CVD-free subjects at baseline, the 1,140 who developed CVD during follow-up had a shorter rLTL (4.3 ± 1.2 ΔΔCt) than those who remained CVD-free after adjusting for age, sex, smoking, and albuminuria status (4.7 ± 1.2 ΔΔCt) (P < 0.001). In Cox regression models, shorter rLTL was associated with higher risk of incident CVD (for each unit decrease, hazard ratio 1.252 [95% CI 1.195-1.311], P < 0.001), which remained significant after adjusting for age, sex, BMI, systolic blood pressure, LDL cholesterol, HbA1c, eGFR, and ACR (hazard ratio 1.141 [95% CI 1.084-1.200], P < 0.001). CONCLUSIONS rLTL is significantly shorter in patients with type 2 diabetes and CVD, is associated with cardiometabolic risk factors, and is independently associated with incident CVD. Telomere length may be a useful biomarker for CVD risk in patients with type 2 diabetes.
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Affiliation(s)
- Feifei Cheng
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China
| | - Andrea O Luk
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China
| | - Claudia H T Tam
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China
| | - Baoqi Fan
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China
| | - Hongjiang Wu
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China
| | - Aimin Yang
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China
| | - Eric S H Lau
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Asia Diabetes Foundation, Shatin, Hong Kong SAR, China
| | - Alex C W Ng
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China
| | - Cadmon K P Lim
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China
| | - Heung Man Lee
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China
| | - Elaine Chow
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China
| | - Alice P Kong
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China
| | - Anthony C Keech
- NHMRC Clinical Trial Centre, Faculty of Medicine and Health, University of Sydney, Sydney, Australia
| | - Mugdha V Joglekar
- NHMRC Clinical Trial Centre, Faculty of Medicine and Health, University of Sydney, Sydney, Australia
| | - Wing Yee So
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China
| | - Alicia J Jenkins
- NHMRC Clinical Trial Centre, Faculty of Medicine and Health, University of Sydney, Sydney, Australia
| | - Juliana C N Chan
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,The Chinese University of Hong Kong-Shanghai Jiao Tong University Joint Research Centre in Diabetes Genomics and Precision Medicine, Prince of Wales Hospital, Hong Kong SAR, China
| | - Anandwardhan A Hardikar
- NHMRC Clinical Trial Centre, Faculty of Medicine and Health, University of Sydney, Sydney, Australia
| | - Ronald C W Ma
- Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China .,Hong Kong Institute of Diabetes and Obesity, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,Li Ka Shing Institute of Health Sciences, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong SAR, China.,NHMRC Clinical Trial Centre, Faculty of Medicine and Health, University of Sydney, Sydney, Australia.,The Chinese University of Hong Kong-Shanghai Jiao Tong University Joint Research Centre in Diabetes Genomics and Precision Medicine, Prince of Wales Hospital, Hong Kong SAR, China
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