1
|
Bardhan A, Brown W, Albright S, Tsang M, Davidson LA, Deiters A. Direct Activation of Nucleobases with Small Molecules for the Conditional Control of Antisense Function. Angew Chem Int Ed Engl 2024; 63:e202318773. [PMID: 38411401 DOI: 10.1002/anie.202318773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 02/22/2024] [Accepted: 02/26/2024] [Indexed: 02/28/2024]
Abstract
Conditionally controlled antisense oligonucleotides provide precise interrogation of gene function at different developmental stages in animal models. Only one example of small molecule-induced activation of antisense function exist. This has been restricted to cyclic caged morpholinos that, based on sequence, can have significant background activity in the absence of the trigger. Here, we provide a new approach using azido-caged nucleobases that are site-specifically introduced into antisense morpholinos. The caging group design is a simple azidomethylene (Azm) group that, despite its very small size, efficiently blocks Watson-Crick base pairing in a programmable fashion. Furthermore, it undergoes facile decaging via Staudinger reduction when exposed to a small molecule phosphine, generating the native antisense oligonucleotide under conditions compatible with biological environments. We demonstrated small molecule-induced gene knockdown in mammalian cells, zebrafish embryos, and frog embryos. We validated the general applicability of this approach by targeting three different genes.
Collapse
Affiliation(s)
- Anirban Bardhan
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, United States
| | - Wes Brown
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, United States
| | - Savannah Albright
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, United States
| | - Michael Tsang
- Department of Cell Biology, Center for Integrative Organ Systems., University of Pittsburgh, Pittsburgh, PA 15260, United States
| | - Lance A Davidson
- Department of Bioengineering, Department of Computational and Systems Biology, University of Pittsburgh, Pittsburgh, PA 15260, United States
| | - Alexander Deiters
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, United States
| |
Collapse
|
2
|
Brown W, Davidson LA, Deiters A. Expanding the Genetic Code of Xenopus laevis Embryos. ACS Chem Biol 2024; 19:516-525. [PMID: 38277773 PMCID: PMC10877573 DOI: 10.1021/acschembio.3c00686] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Revised: 12/20/2023] [Accepted: 12/20/2023] [Indexed: 01/28/2024]
Abstract
The incorporation of unnatural amino acids into proteins through genetic code expansion has been successfully adapted to African claw-toed frog embryos. Six unique unnatural amino acids are incorporated site-specifically into proteins and demonstrate robust and reliable protein expression. Of these amino acids, several are caged analogues that can be used to establish conditional control over enzymatic activity. Using light or small molecule triggers, we exhibit activation and tunability of protein functions in live embryos. This approach was then applied to optical control over the activity of a RASopathy mutant of NRAS, taking advantage of generating explant cultures from Xenopus. Taken together, genetic code expansion is a robust approach in the Xenopus model to incorporate novel chemical functionalities into proteins of interest to study their function and role in a complex biological setting.
Collapse
Affiliation(s)
- Wes Brown
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Lance A. Davidson
- Departments
of Bioengineering, Developmental Biology, and Computational and Systems
Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Alexander Deiters
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| |
Collapse
|
3
|
Brown W, Oliveira M, Reis Silva R, Woodruff K, Bisha B, Demetrio D, Block J. Effects of mycobacterium cell wall fraction on embryo development following in vitro embryo production and pregnancy rates following embryo transfer in virgin dairy heifers. Theriogenology 2024; 215:334-342. [PMID: 38134681 DOI: 10.1016/j.theriogenology.2023.12.019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2023] [Revised: 11/28/2023] [Accepted: 12/13/2023] [Indexed: 12/24/2023]
Abstract
An experiment was conducted to determine whether administration of mycobacterium cell wall fraction (MCWF; Amplimune, NovaVive) could enhance embryo developmental competence following in vitro embryo production (IVP) and pregnancy establishment after embryo transfer (ET). Nulliparous, Holstein heifers (n = 40; age 8-15 months) were submitted to two rounds of ovum pick-up (OPU) and IVP in a crossover design. Thirty-six h after follicle wave synchronization, treatments (saline or MCWF, 5 mL, im) were administered in conjunction with a single dose of follicle stimulating hormone (175 IU) and OPU was performed 48-52 h later. Recovered cumulus-oocyte complexes were used for IVP to assess embryo development. For ET, nulliparous, Holstein heifers (n = 225; age 12-18 months) were used as recipients. At 12-24 h after detection of spontaneous estrus, recipients were randomly treated with either saline or MCWF (5 mL, im). The effect of MCWF on pregnancy per ET (P/ET) was assessed in a 2 × 2 factorial design with recipients treated with or without MCWF receiving a fresh IVP embryo from a donor treated with or without MCWF at day 7 or 8 after detected estrus. Blood samples were collected from a subset of donors (n = 8) and recipients (n = 26 to 33 per treatment) prior to treatment and at 6 and 24 h post-treatment to determine serum concentration of interleukin (IL)-1β, IL-6, tumor necrosis factor-α, and interferon-γ. Blood samples were also collected from a group of recipients (n = 31 to 39 per treatment) to assess serum concentration of progesterone at days 4, 7, and 16 post-treatment. Pregnancy status was determined at days 40 and 100 of gestation. Donor treatment with MCWF tended (P < 0.07) to increase the proportion of oocytes that developed into transferable embryos, but there was no effect of MCWF on other parameters of embryo development. The P/ET at days 40 and 100 of gestation and pregnancy loss were not affected by donor treatment or recipient treatment with MCWF and there was no interaction. Serum concentration of proinflammatory cytokines among donors and recipients and serum concentration of progesterone among recipients were not increased by treatment with MCWF. Results of the present study indicate that treatment of donors with MCWF has minimal impact on subsequent embryo development following IVP. Moreover, regardless of whether donors or recipients were treated with MCWF, there was no effect on P/ET following transfer of IVP embryos.
Collapse
Affiliation(s)
- W Brown
- Department of Animal Science, University of Wyoming, Laramie, WY, USA
| | | | - R Reis Silva
- EVZ, Federal University of Goias, Goiania, GO, Brazil
| | - K Woodruff
- Department of Animal Science, University of Wyoming, Laramie, WY, USA
| | - B Bisha
- Department of Animal Science, University of Wyoming, Laramie, WY, USA
| | | | - J Block
- Department of Animal Science, University of Wyoming, Laramie, WY, USA.
| |
Collapse
|
4
|
Brown W, Wesalo J, Samanta S, Luo J, Caldwell SE, Tsang M, Deiters A. Genetically Encoded Aminocoumarin Lysine for Optical Control of Protein-Nucleotide Interactions in Zebrafish Embryos. ACS Chem Biol 2023; 18:1305-1314. [PMID: 37272594 PMCID: PMC10278064 DOI: 10.1021/acschembio.3c00028] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Accepted: 05/17/2023] [Indexed: 06/06/2023]
Abstract
The strategic placement of unnatural amino acids into the active site of kinases and phosphatases has allowed for the generation of photocaged signaling proteins that offer spatiotemporal control over activation of these pathways through precise light exposure. However, deploying this technology to study cell signaling in the context of embryo development has been limited. The promise of optical control is especially useful in the early stages of an embryo where development is driven by tightly orchestrated signaling events. Here, we demonstrate light-induced activation of Protein Kinase A and a RASopathy mutant of NRAS in the zebrafish embryo using a new light-activated amino acid. We applied this approach to gain insight into the roles of these proteins in gastrulation and heart development and forge a path for further investigation of RASopathy mutant proteins in animals.
Collapse
Affiliation(s)
- Wes Brown
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Joshua Wesalo
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Subhas Samanta
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Ji Luo
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Steven E. Caldwell
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Michael Tsang
- Department
of Developmental Biology, University of
Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Alexander Deiters
- Department
of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| |
Collapse
|
5
|
Brown W, Galpin JD, Rosenblum C, Tsang M, Ahern CA, Deiters A. Chemically Acylated tRNAs are Functional in Zebrafish Embryos. J Am Chem Soc 2023; 145:2414-2420. [PMID: 36669466 PMCID: PMC10155198 DOI: 10.1021/jacs.2c11452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Genetic code expansion has pushed protein chemistry past the canonical 22 amino acids. The key enzymes that make this possible are engineered aminoacyl tRNA synthetases. However, as the number of genetically encoded amino acids has increased over the years, obvious limits in the type and size of novel side chains that can be accommodated by the synthetase enzyme become apparent. Here, we show that chemically acylating tRNAs allow for robust, site-specific incorporation of unnatural amino acids into proteins in zebrafish embryos, an important model organism for human health and development. We apply this approach to incorporate a unique photocaged histidine analogue for which synthetase engineering efforts have failed. Additionally, we demonstrate optical control over different enzymes in live embryos by installing photocaged histidine into their active sites.
Collapse
Affiliation(s)
- Wes Brown
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Jason D Galpin
- Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, Iowa 52242, United States
| | - Carolyn Rosenblum
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Michael Tsang
- Department of Developmental Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Christopher A Ahern
- Department of Molecular Physiology and Biophysics, University of Iowa, Iowa City, Iowa 52242, United States
| | - Alexander Deiters
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| |
Collapse
|
6
|
Brown W, Wesalo J, Tsang M, Deiters A. Engineering Small Molecule Switches of Protein Function in Zebrafish Embryos. J Am Chem Soc 2023; 145:2395-2403. [PMID: 36662675 DOI: 10.1021/jacs.2c11366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Precise temporally regulated protein function directs the highly complex processes that make up embryo development. The zebrafish embryo is an excellent model organism to study development, and conditional control over enzymatic activity is desirable to target chemical intervention to specific developmental events and to investigate biological mechanisms. Surprisingly few, generally applicable small molecule switches of protein function exist in zebrafish. Genetic code expansion allows for site-specific incorporation of unnatural amino acids into proteins that contain caging groups that are removed through addition of small molecule triggers such as phosphines or tetrazines. This broadly applicable control of protein function was applied to activate several enzymes, including a GTPase and a protease, with temporal precision in zebrafish embryos. Simple addition of the small molecule to the media produces robust and tunable protein activation, which was used to gain insight into the development of a congenital heart defect from a RASopathy mutant of NRAS and to control DNA and protein cleavage events catalyzed by a viral recombinase and a viral protease, respectively.
Collapse
Affiliation(s)
- Wes Brown
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Joshua Wesalo
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Michael Tsang
- Department of Developmental Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Alexander Deiters
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| |
Collapse
|
7
|
Brown W, Rosenblum C, Deiters A. Small-Molecule Phosphine Activation of Protein Function in Zebrafish Embryos with an Expanded Genetic Code. Methods Mol Biol 2023; 2676:247-263. [PMID: 37277638 DOI: 10.1007/978-1-0716-3251-2_18] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Conditional control of protein function in a living model organism is an important tool for studying the effects of that protein during development and disease. In this chapter, we walk through the steps to generate a small-molecule-activatable enzyme in zebrafish embryos through the incorporation of a noncanonical amino acid into the protein active site. This method can be applied to many enzyme classes, which we highlight with temporal control of a luciferase and a protease. We demonstrate that strategic placement of the noncanonical amino acid completely blocks enzyme activity, which is then promptly restored after addition of the nontoxic small molecule inducer to the embryo water.
Collapse
Affiliation(s)
- Wes Brown
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA
| | - Carolyn Rosenblum
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA
| | - Alexander Deiters
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, USA.
| |
Collapse
|
8
|
Brown W, Oliveria M, Reis Silva R, Demetrio D, Block J. 202 Effects of administration of mycobacterium cell wall fraction during follicle superstimulation on oocyte numbers and embryo development following ovum pickup and. Reprod Fertil Dev 2022. [DOI: 10.1071/rdv35n2ab202] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022] Open
|
9
|
Brown W, Oliveria M, Reis Silva R, Demetrio D, Block J. 133 Effect of administration of mycobacterium cell wall fraction during the periovulatory period on the proportion of pregnancies obtained in virgin dairy heifers receiving. Reprod Fertil Dev 2022. [DOI: 10.1071/rdv35n2ab133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
|
10
|
Brown W, Albright S, Tsang M, Deiters A. Optogenetic Protein Cleavage in Zebrafish Embryos. Chembiochem 2022; 23:e202200297. [PMID: 36196665 DOI: 10.1002/cbic.202200297] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 10/01/2022] [Indexed: 01/25/2023]
Abstract
A wide array of optogenetic tools are available that allow for precise spatiotemporal control over cellular processes. These tools are particularly important to zebrafish researchers who take advantage of the embryo's transparency. However, photocleavable optogenetic proteins have not been utilized in zebrafish. We demonstrate successful optical control of protein cleavage in embryos using PhoCl, a photocleavable fluorescent protein. This optogenetic tool offers temporal and spatial control over protein cleavage events, which we demonstrate in light-triggered protein translocation and light-triggered apoptosis.
Collapse
Affiliation(s)
- Wes Brown
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Savannah Albright
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Michael Tsang
- Department of Developmental Biology, University of Pittsburgh, Pittsburgh, PA 15260, USA
| | - Alexander Deiters
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
| |
Collapse
|
11
|
Ostrenga J, Cromwell E, Todd J, Faro A, Brown W, Marshall B, Willis A, Dieni O. 361 Distribution and cost of common cystic fibrosis prescription drugs using claims data. J Cyst Fibros 2022. [DOI: 10.1016/s1569-1993(22)01051-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
12
|
Brown W, Bardhan A, Darrah K, Tsang M, Deiters A. Optical Control of MicroRNA Function in Zebrafish Embryos. J Am Chem Soc 2022; 144:16819-16826. [PMID: 36073798 DOI: 10.1021/jacs.2c04479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
MicroRNAs play crucial and dynamic roles in vertebrate development and diseases. Some, like miR-430, are highly expressed during early embryo development and regulate hundreds of transcripts, which can make it difficult to study their role in the timing and location of specific developmental processes using conventional morpholino oligonucleotide (MO) knockdown or genetic deletion approaches. We demonstrate that light-activated circular morpholino oligonucleotides (cMOs) can be applied to the conditional control of microRNA function. We targeted miR-430 in zebrafish embryos to study its role in the development of the embryo body and the heart. Using 405 nm irradiation, precise spatial and temporal control over miR-430 function was demonstrated, offering insight into the cell populations and developmental timepoints involved in each process.
Collapse
Affiliation(s)
- Wes Brown
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Anirban Bardhan
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Kristie Darrah
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Michael Tsang
- Department of Developmental Biology, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Alexander Deiters
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| |
Collapse
|
13
|
Wasik P, McLeod GA, Mountain R, Watts S, Briggs H, Maini N, Belford I, McGuire B, Brown W, Clark R, Eley I, Richardson E, Stonebridge P. Design and testing of the safety of the SARUS-CPR hood for novice resuscitators. Scott Med J 2022; 67:189-195. [PMID: 35818757 DOI: 10.1177/00369330221112186] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
BACKGROUND AND AIMS Bystanders should be protected against aerosols, droplets, saliva, blood and vomitus during resuscitation after cardiac arrest The SARUS (safer - airway - resuscitation) CPR airway hood™ is a clear plastic cover and integrated mask that envelopes the head and torso. Our objectives were to test leakage using saline aerosol generation tests, then assess the performance of the hood during mock cardio-pulmonary resuscitation on a manikin. METHODS A checklist was validated by comparing the performance of 10 novices against 10 experts during mock resuscitation. Thereafter, 15 novices were tested with and without the hood, in a randomised cross-over study, one week apart. RESULTS Laboratory analysis showed a > 99% reduction of saline particles detected 5 cm, 75 cm and 165 cm above volunteers wearing the hood. On manikins, experts scored better compared to novices, 8.5 (0.7) vs 7.6 (1.2), difference (95%CI) 0.9 (0.4-1.3), P = 0.0004. Novice performance was equivalent using the hood and standard equipment, 7.3 (1.4) vs 7.3 (1.1) respectively, difference (90%CI) 0.0 (-0.3 - 0.3), P = 0.90. CONCLUSION Aerosol transmission reduced in the breathing zone. Simulated resuscitation by novices was equivalent with and without the hood.
Collapse
Affiliation(s)
- P Wasik
- Trainee Anesthetist, NHS Tayside, UK
| | - G A McLeod
- Consultant Anaesthetist, NHS Tayside, UK.,Honorary Professor, 3042University of Dundee, UK
| | | | - S Watts
- Trainee Anesthetist, NHS Tayside, UK
| | - H Briggs
- Trainee Anesthetist, NHS Tayside, UK
| | - N Maini
- Consultant Anaesthetist, NHS Tayside, UK
| | - I Belford
- Trainee Anesthetist, NHS Tayside, UK
| | - B McGuire
- Consultant Anaesthetist, NHS Tayside, UK
| | - W Brown
- 9536Institute of Occupational Medicine, Edinburgh, UK of Great Britain and Northern Ireland
| | - R Clark
- 9536Institute of Occupational Medicine, Edinburgh, UK of Great Britain and Northern Ireland
| | - I Eley
- 9536Institute of Occupational Medicine, Edinburgh, UK of Great Britain and Northern Ireland
| | - E Richardson
- 59805Ninewells Hospital and Medical School, Dundee, UK of Great Britain and Northern Ireland
| | - P Stonebridge
- Honorary Professor, 3042University of Dundee, UK.,Consultant Vascular Surgeon & Medical Director, Ninewells Hospital, NHS Tayside, Dundee, UK of Great Britain and Northern Ireland
| |
Collapse
|
14
|
Charters PFP, Rossdale J, Brown W, Burnett TA, Komber HMEI, Thompson C, Robinson G, MacKenzie Ross R, Suntharalingam J, Rodrigues JCL. Diagnostic accuracy of an automated artificial intelligence derived right ventricular to left ventricular diameter ratio tool on CT pulmonary angiography to predict pulmonary hypertension at right heart catheterisation. Clin Radiol 2022; 77:e500-e508. [PMID: 35487778 DOI: 10.1016/j.crad.2022.03.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Accepted: 03/09/2022] [Indexed: 11/25/2022]
Abstract
AIM To determine the diagnostic accuracy of an automated artificial intelligence derived right ventricle/left ventricle diameter ratio (RV/LV) computed tomography pulmonary angiography (CTPA) analysis tool to detect pulmonary hypertension (PH) in patients with suspected PH referred to a specialist centre. MATERIALS AND METHODS The present study was a retrospective analysis of a prospectively maintained database of 202 consecutive patients with suspected PH, who underwent CTPA within 12 months of right heart catheterisation (RHC). Automated ventricular segmentation and RV/LV calculation (Imbio LLC, Minneapolis, MN, USA) was undertaken on the CTPA images. PH diagnosis was made using the RHC reference standard. RESULTS The automated RV/LV correlated more strongly with RHC metrics than main pulmonary artery (MPA) diameter and MPA to ascending aorta diameter ratio (MPA/AA) measured manually (mean pulmonary arterial pressure [mPAP] r=0.535, R2 = 0.287 p<0.001; pulmonary vascular resistance [PVR] r=0.607, R2 = 0.369 p<0.001). In the derivation cohort (n=100), the area under the receiver-operating curve for automated RV/LV discriminating PH was 0.752 (95% confidence interval [CI] 0.677-0.827, p<0.001). Using an optimised Youden's Index of ≥1.12 classified from derivation, automated RV/LV ratio analysis was more sensitive for the detection of PH with higher positive predictive value (PPV) when compared with manual MPA and MPA/AA in the validation cohort (n=102). Automated RV/LV compromise (1.12) and specific (1.335) thresholds were strongly predictive of mortality (log-rank 7.401, p=0.007 and log-rank 16.075, p<0.001 respectively). CONCLUSION In suspected PH, automated RV/LV diameter thresholds have high sensitivity for PH, outperform manual MPA and MPA/AA and can predict survival.
Collapse
Affiliation(s)
- P F P Charters
- Department of Radiology, Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
| | - J Rossdale
- Department of Respiratory Medicine, Royal United Hospitals Bath NHS Foundation Trust, Bath, UK; Department of Pharmacy and Pharmacology, University of Bath, UK
| | - W Brown
- Department of Radiology, Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
| | - T A Burnett
- Department of Radiology, Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
| | - H M E I Komber
- Department of Radiology, Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
| | - C Thompson
- Department of Radiology, Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
| | - G Robinson
- Department of Radiology, Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
| | - R MacKenzie Ross
- Department of Respiratory Medicine, Royal United Hospitals Bath NHS Foundation Trust, Bath, UK
| | - J Suntharalingam
- Department of Respiratory Medicine, Royal United Hospitals Bath NHS Foundation Trust, Bath, UK; Department of Pharmacy and Pharmacology, University of Bath, UK
| | - J C L Rodrigues
- Department of Radiology, Royal United Hospitals Bath NHS Foundation Trust, Bath, UK; Department for Health, University of Bath, Bath, UK.
| |
Collapse
|
15
|
Brown W, Mena G, Mielke G. High levels of physical activity are associated with a lower occurrence of heavy menstrual bleeding: Data from a large population-based cohort study. J Sci Med Sport 2021. [DOI: 10.1016/j.jsams.2021.09.118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
16
|
Brady R, Brown W, Keating S, Mielke G, Nunes B. Are frequency and intensity of physical activity associated with reduced risk of hypertension and obesity in Australian women? J Sci Med Sport 2021. [DOI: 10.1016/j.jsams.2021.09.115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
17
|
Affiliation(s)
- Wenyuan Zhou
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Wes Brown
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Anirban Bardhan
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Michael Tsang
- Department of Developmental Biology University of Pittsburgh Pittsburgh PA 15260 USA
| | - Alexander Deiters
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| |
Collapse
|
18
|
Müller PC, Kapp JR, Vetter D, Bonavina L, Brown W, Castro S, Cheong E, Darling GE, Egberts J, Ferri L, Gisbertz SS, Gockel I, Grimminger PP, Hofstetter WL, Hölscher AH, Low DE, Luyer M, Markar SR, Mönig SP, Moorthy K, Morse CR, Müller-Stich BP, Nafteux P, Nieponice A, Nieuwenhuijzen GAP, Nilsson M, Palanivelu C, Pattyn P, Pera M, Räsänen J, Ribeiro U, Rosman C, Schröder W, Sgromo B, van Berge Henegouwen MI, van Hillegersberg R, van Veer H, van Workum F, Watson DI, Wijnhoven BPL, Gutschow CA. Fit-for-Discharge Criteria after Esophagectomy: An International Expert Delphi Consensus. Dis Esophagus 2021; 34:5909885. [PMID: 32960264 DOI: 10.1093/dote/doaa101] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 07/03/2020] [Accepted: 08/15/2020] [Indexed: 12/11/2022]
Abstract
There are no internationally recognized criteria available to determine preparedness for hospital discharge after esophagectomy. This study aims to achieve international consensus using Delphi methodology. The expert panel consisted of 40 esophageal surgeons spanning 16 countries and 4 continents. During a 3-round, web-based Delphi process, experts voted for discharge criteria using 5-point Likert scales. Data were analyzed using descriptive statistics. Consensus was reached if agreement was ≥75% in round 3. Consensus was achieved for the following basic criteria: nutritional requirements are met by oral intake of at least liquids with optional supplementary nutrition via jejunal feeding tube. The patient should have passed flatus and does not require oxygen during mobilization or at rest. Central venous catheters should be removed. Adequate analgesia at rest and during mobilization is achieved using both oral opioid and non-opioid analgesics. All vital signs should be normal unless abnormal preoperatively. Inflammatory parameters should be trending down and close to normal (leucocyte count ≤12G/l and C-reactive protein ≤80 mg/dl). This multinational Delphi survey represents the first expert-led process for consensus criteria to determine 'fit-for-discharge' status after esophagectomy. Results of this Delphi survey may be applied to clinical outcomes research as an objective measure of short-term recovery. Furthermore, standardized endpoints identified through this process may be used in clinical practice to guide decisions regarding patient discharge and may help to reduce the risk of premature discharge or prolonged admission.
Collapse
Affiliation(s)
- P C Müller
- Department of Visceral and Transplant Surgery, University Hospital Zurich, Zurich, Switzerland
| | - J R Kapp
- Department of Visceral and Transplant Surgery, University Hospital Zurich, Zurich, Switzerland
| | - D Vetter
- Department of Visceral and Transplant Surgery, University Hospital Zurich, Zurich, Switzerland
| | - L Bonavina
- IRCCS Policlinico San Donato, Division of General and Foregut Surgery, Department of Biomedical Sciences for Health, University of Milan, Milan, Italy
| | - W Brown
- Oesophago-Gastric and Bariatric Unit, Department of General Surgery, The Alfred Hospital, Melbourne, Australia
| | - S Castro
- Department of Surgery, Vall d'Hebron Hospital, Barcelona, Spain
| | - E Cheong
- Department of General Surgery, Norfolk and Norwich University Hospital, Norwich, UK
| | - G E Darling
- Division of Thoracic Surgery, Department of Surgery, Toronto General Hospital, University of Toronto, Toronto, Canada
| | - J Egberts
- Department of General, Visceral-, Thoracic-, Transplantation-, and Pediatric Surgery, Kurt-Semm Center for Laparoscopic and Robotic Assisted Surgery, University Hospital Schleswig Holstein, Campus Kiel, Kiel, Germany
| | - L Ferri
- Departments of Surgery and Oncology, Montreal General Hospital, McGill University, Montreal, Canada
| | - S S Gisbertz
- Amsterdam UMC, University of Amsterdam, Department of Surgery, Cancer Center Amsterdam, Amsterdam, The Netherlands
| | - I Gockel
- Department of Visceral, Thoracic, Transplant and Vascular surgery, University Hospital of Leipzig, Leipzig, Germany
| | - P P Grimminger
- Department of General, Visceral and Transplant Surgery, University Medical Center of the Johannes Gutenberg University, Mainz, Germany
| | - W L Hofstetter
- Department of Thoracic and Cardiovascular Surgery, University of Texas MD Anderson Cancer Center, Houston, USA
| | - A H Hölscher
- Center for Oesophageal and Gastric Surgery, AGAPLESION Markus Krankenhaus, Frankfurt am Main, Germany
| | - D E Low
- Department of General, Thoracic and Vascular Surgery, Virginia Mason Medical Center, Seattle, USA
| | - M Luyer
- Department of Surgery, Catharina Hospital, Eindhoven, The Netherlands
| | - S R Markar
- Imperial College Healthcare NHS Trust and Imperial College, London, UK
| | - S P Mönig
- Division of Visceral Surgery, Department of Surgery, University of Geneva, Hospitals and School of Medicine, Geneva, Switzerland
| | - K Moorthy
- Imperial College Healthcare NHS Trust and Imperial College, London, UK
| | - C R Morse
- Division of Thoracic Surgery, Department of Surgery, Massachusetts General Hospital, Boston, USA
| | - B P Müller-Stich
- Department of General, Visceral and Transplantation Surgery, University of Heidelberg, Heidelberg, Germany
| | - P Nafteux
- Department of Thoracic Surgery, University Hospital Leuven, Leuven, Belgium
| | - A Nieponice
- Esophageal Institute, Hospital Universitario Fundacion Favaloro, Buenos Aires, Argentina
| | | | - M Nilsson
- Division of Surgery, Department of Clinical Science Intervention and Technology, Karolinska Institute, Stockholm, Sweden
| | - C Palanivelu
- Department of Surgical Gastroenterology, GEM Hospital & Research Centre, Coimbatore, India
| | - P Pattyn
- Department of Surgery, University Center Ghent, Ghent, Belgium
| | - M Pera
- Department of Surgery, Section of Gastrointestinal Surgery, Hospital Universitario del Mar, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - J Räsänen
- Department of General Thoracic and Esophageal Surgery, Heart and Lung Centre, Helsinki University Hospital, Helsinki, Finland
| | - U Ribeiro
- Department of Gastroenterology, Cancer Institute, University of São Paulo Medical School, São Paulo, Brazil
| | - C Rosman
- Department of Surgical Oncology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - W Schröder
- Department of General, Visceral and Cancer Surgery, University of Cologne, Germany
| | - B Sgromo
- Department of Upper GI Surgery, Oxford University Hospitals, UK
| | | | - R van Hillegersberg
- Department of Surgical Oncology, University Medical Center Utrecht, The Netherlands
| | - H van Veer
- Department of Thoracic Surgery, University Hospital Leuven, Leuven, Belgium
| | - F van Workum
- Department of Surgical Oncology, Radboud University Medical Center, Nijmegen, The Netherlands
| | - D I Watson
- Flinders University Department of Surgery, Flinders Medical Centre, Bedford Park, Australia
| | - B P L Wijnhoven
- Department of Surgery, Erasmus MC, University Medical Center Rotterdam, The Netherlands
| | - C A Gutschow
- Department of Visceral and Transplant Surgery, University Hospital Zurich, Zurich, Switzerland
| |
Collapse
|
19
|
Abstract
Conditional control of CRISPR/Cas9 has been developed by using a variety of different approaches, many focusing on manipulation of the Cas9 protein itself. However, more recent strategies for governing CRISPR/Cas9 function are based on guide RNA (gRNA) modifications. They include control of gRNAs by light, small molecules, proteins, and oligonucleotides. These designs have unique advantages compared to other approaches and have allowed precise regulation of gene editing and transcription. Here, we discuss strategies for conditional control of gRNA function and compare effectiveness of these methods.
Collapse
Affiliation(s)
| | | | - Alexander Deiters
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (USA)
| |
Collapse
|
20
|
Denost Q, Solomon M, Tuech JJ, Ghouti L, Cotte E, Panis Y, Lelong B, Rouanet P, Faucheron JL, Jafari M, Lefevre JH, Rullier E, Heriot A, Austin K, Lee P, Brown W, Maillou-Martinaud H, Savel H, Quintard B, Broc G, Saillour-Glénisson F. International variation in managing locally advanced or recurrent rectal cancer: prospective benchmark analysis. Br J Surg 2020; 107:1846-1854. [PMID: 32786027 DOI: 10.1002/bjs.11854] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 06/03/2020] [Accepted: 06/04/2020] [Indexed: 01/04/2023]
Abstract
BACKGROUND Tumour extension beyond the mesorectal plane (ymrT4) occurs in 5-10 per cent of patients with rectal cancer and 10 per cent of patients develop locally recurrent rectal cancer (LRRC) after primary surgery. There is global variation in healthcare delivery for these conditions. METHODS An international benchmark trial of the management of ymrT4 tumours and LRRC was undertaken in France and Australia between 2015 and 2017. Heterogeneity in management and operative decision-making were analysed by comparison of surgical resection rates, blinded intercountry reading of pelvic MRI, quality-of-life assessment and qualitative evaluations. RESULTS Among 154 patients (97 in France and 57 in Australia), 31·8 per cent had ymrT4 disease and 68·2 per cent LRRC. The surgical resection rates were 88 and 79 per cent in France and Australia respectively (P = 0·112). The concordance in operative planning was low (κ = 0·314); the rate of pelvic exenteration was lower in France than Australia both in clinical practice (36 of 78 versus 34 of 40; P < 0·001) and in theoretical conditions (10 of 25 versus 50 of 57; P = 0·002). The R0 resection rate was lower in France than Australia for LRRC (25 of 49 versus 18 of 21; P = 0·007) but not for ymrT4 tumours (21 of 26 versus 15 of 15; P = 0·139). Morbidity rates were similar. Patients who underwent non-exenterative procedures had higher scores on the mental functioning subscale at 12 months (P = 0·047), and a lower level of distress at 6 months (P = 0·049). Qualitative analysis highlighted five categories of psychosocial factors influencing treatment decisions: patient, strategy, specialist, organization and culture. CONCLUSION This international benchmark trial has highlighted the differences in worldwide treatment of locally advanced and LRRC. Standardized care should improve outcomes for these patients.
Collapse
Affiliation(s)
- Q Denost
- Department of Digestive Surgery, Colorectal Unit, Haut-leveque Hospital, Bordeaux University Hospital, Pessac, France
| | - M Solomon
- Department of Colorectal Surgery, Royal Prince Alfred Hospital, Sydney, New South, Wales
| | - J-J Tuech
- Department of Digestive Surgery, Charles Nicolle Hospital, Rouen University Hospital, Rouen, France
| | - L Ghouti
- Department of General and Digestive Surgery, Purpan Hospital, Toulouse University Hospital, Toulouse, France
| | - E Cotte
- Department of Digestive Surgery, Pierre-Bénite Hospital, Lyon University Hospital, Lyon, France
| | - Y Panis
- Department of Colorectal Surgery, Beaujon Hospital, Assistance Publique - Hôpitaux de Paris, University Denis Diderot (Paris VII), Clichy, France
| | - B Lelong
- Department of Oncological Surgery, Paoli-Calmettes Institute, Marseille, France
| | - P Rouanet
- Department of Surgery, Montpellier Cancer Institute, University of Montpellier, Montpellier, France
| | - J-L Faucheron
- Colorectal Unit, Department of Surgery, Michallon Hospital, Grenoble University Hospital, Grenoble, France
| | - M Jafari
- Department of Oncological Surgery, Oscar Lambret Centre, Lille, France
| | - J H Lefevre
- Department of General and Digestive Surgery, Saint-Antoine Hospital, Sorbonne Université, Paris, France
| | - E Rullier
- Department of Digestive Surgery, Colorectal Unit, Haut-leveque Hospital, Bordeaux University Hospital, Pessac, France
| | - A Heriot
- Colorectal Surgery Unit, Peter MacCallum Cancer Centre, Melbourne, Victoria, Australia
| | - K Austin
- Department of Colorectal Surgery, Royal Prince Alfred Hospital, Sydney, New South, Wales
| | - P Lee
- Department of Colorectal Surgery, Royal Prince Alfred Hospital, Sydney, New South, Wales
| | - W Brown
- Surgical Outcome Research Centre, Royal Prince Alfred Hospital, University of Sydney, Sydney, New South, Wales
| | - H Maillou-Martinaud
- Department of Digestive Surgery, Colorectal Unit, Haut-leveque Hospital, Bordeaux University Hospital, Pessac, France
| | - H Savel
- Methodological Support Unit for Clinical and Epidemiological, Bordeaux, France
| | - B Quintard
- Bordeaux University Laboratoire de Psychologie EA 4136 'Handicap, Activité, Cognition, Santé', Institut National de la Santé et de la Recherche Médicale (INSERM), Unité Mixte de Recherche (U)1219 - Bordeaux Population Health.,INSERM, Bordeaux School of Public Health (INSPED), Centre INSERM U1219 - Bordeaux Population Health, Team EMOS, Bordeaux, France
| | - G Broc
- University Paul Valéry Montpellier 3, University of Montpellier, Epsylon EA 4556, Montpellier, France
| | - F Saillour-Glénisson
- Service d'Information Médicale, Public Health Centre, Centre Hospitalier Universitaire, Bordeaux, France.,University of Bordeaux, ISPED, Centre INSERM U1219 - Bordeaux Population Health, Bordeaux, France
| |
Collapse
|
21
|
Zhou W, Brown W, Bardhan A, Delaney M, Ilk AS, Rauen RR, Kahn SI, Tsang M, Deiters A. Spatiotemporal Control of CRISPR/Cas9 Function in Cells and Zebrafish using Light-Activated Guide RNA. Angew Chem Int Ed Engl 2020; 59:8998-9003. [PMID: 32160370 PMCID: PMC7250724 DOI: 10.1002/anie.201914575] [Citation(s) in RCA: 68] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 02/14/2020] [Indexed: 12/27/2022]
Abstract
We developed a new method for the conditional regulation of CRISPR/Cas9 activity in mammalian cells and zebrafish embryos using photochemically activated, caged guide RNAs (gRNAs). Caged gRNAs are generated by substituting four nucleobases evenly distributed throughout the 5'-protospacer region with caged nucleobases during synthesis. Caging confers complete suppression of gRNA:dsDNA-target hybridization and rapid restoration of CRISPR/Cas9 function upon optical activation. This tool offers simplicity and complete programmability in design, high spatiotemporal specificity in cells and zebrafish embryos, excellent off-to-on switching, and stability by preserving the ability to form Cas9:gRNA ribonucleoprotein complexes. Caged gRNAs are novel tools for the conditional control of gene editing, thereby enabling the investigation of spatiotemporally complex physiological events by obtaining a better understanding of dynamic gene regulation.
Collapse
Affiliation(s)
- Wenyuan Zhou
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Wes Brown
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Anirban Bardhan
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Michael Delaney
- Horizon Discovery, 2650 Crescent Drive, Lafayette, CO, 80026, USA
| | - Amber S Ilk
- Horizon Discovery, 2650 Crescent Drive, Lafayette, CO, 80026, USA
| | - Randy R Rauen
- Horizon Discovery, 2650 Crescent Drive, Lafayette, CO, 80026, USA
| | - Shoeb I Kahn
- Horizon Discovery, 2650 Crescent Drive, Lafayette, CO, 80026, USA
| | - Michael Tsang
- Department of Developmental Biology, School of Medicine, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Alexander Deiters
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| |
Collapse
|
22
|
Zhou W, Brown W, Bardhan A, Delaney M, Ilk AS, Rauen RR, Kahn SI, Tsang M, Deiters A. Spatiotemporal Control of CRISPR/Cas9 Function in Cells and Zebrafish using Light‐Activated Guide RNA. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914575] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Wenyuan Zhou
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Wes Brown
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Anirban Bardhan
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| | - Michael Delaney
- Horizon Discovery 2650 Crescent Drive Lafayette CO 80026 USA
| | - Amber S. Ilk
- Horizon Discovery 2650 Crescent Drive Lafayette CO 80026 USA
| | - Randy R. Rauen
- Horizon Discovery 2650 Crescent Drive Lafayette CO 80026 USA
| | - Shoeb I. Kahn
- Horizon Discovery 2650 Crescent Drive Lafayette CO 80026 USA
| | - Michael Tsang
- Department of Developmental Biology School of Medicine University of Pittsburgh Pittsburgh PA 15260 USA
| | - Alexander Deiters
- Department of Chemistry University of Pittsburgh Pittsburgh PA 15260 USA
| |
Collapse
|
23
|
Fielder T, Luk P, Karim R, McCarthy S, Bonar F, Maclean F, Cheah A, Jones M, Brown W, Stalley P, Mahar A. 3. Angiofibroma of soft tissue: A case series. Pathology 2020. [DOI: 10.1016/j.pathol.2020.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
24
|
Jain AV, Ross PF, Carlson MP, Barger T, Barr C, Booth M, Brown W, Buckley C, Coatuey C, Colvin B, Everson R, Holt K, Kinker J, Landgraf W, Lecrone E, Medlin M, Ross S, Rumbler P, Sanchez D, Short A, Shockley M, Tahara J, Warner D, Weiband L. Screening Nitrate in Forages with a Test Strip: Collaborative Study. J AOAC Int 2020. [DOI: 10.1093/jaoac/82.1.9] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
A collaborative study was conducted for screening nitrate in forages with a commercially available test strip. The method involves extracting a finely ground sample with deionized water. The test strip is dipped in the sample extract. The color of the reaction zone on the test strip changes from white to pink or purple depending on the nitrate concentration in sample extract. The nitrate present in the extract is determined by comparing the color of the test strip to the color scale on the test strip container. Six blind quintuplicates of forage samples were analyzed by 20 collaborators. Nitrate concentrations in forage samples tested ranged from <1000 ppm nitrate to >10 000 ppm nitrate on dry matter basis. Each collaborator was asked to assign each sample to one of the 4 following nitrate concentration ranges: (1) <1000 ppm, (2) 1000 to 5000 ppm, (3)>5000 ppm to 10 000 ppm, and (4) >10 000 ppm. Nineteen of 20 collaborators reported results. Results from 2 laboratories were rejected as outliers by inspection and χ2 test. Sensitivity rates (p+) ranged from 0.965 to 0.998, with standard errors of 0.006 to 0.16. Specificity rates (p−) ranged from 0.991 to 0.997 for the 4 ranges, with standard errors of 0.003 to 0.006. False-positive rates (pf+) ranged from 0.006 to 0.046, with standard errors of 0.006 to 0.025. False-negative rates (pf−) ranged from 0.003 to 0.007, with standard errors of 0.003 to 0.006. Screening nitrate in forages with a test strip has been adopted first action by AOAC INTERNATIONAL.
Collapse
Affiliation(s)
- Anant V Jain
- The University of Georgia, College of Veterinary Medicine, Athens Veterinary Diagnostic Laboratory, Athens, GA 30602-7383
| | - P Frank Ross
- U.S. Department of Agriculture, National Veterinary Services Laboratory, Toxicology Section, PO Box 844, Ames, IA 50010
| | - Michael P Carlson
- University of Nebraska–Lincoln, Veterinary Diagnostic Center, Lincoln, NE 68583-0907
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Mena G, Mielke G, Brown W. Do physical activity and sitting time affect associations between BMI and fertility in women? Data from a large population-based cohort study. J Sci Med Sport 2019. [DOI: 10.1016/j.jsams.2019.08.245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
26
|
Pavey T, De Cocker K, Brown W, Bennie J. Is the recommendation of 300 minutes of physical activity a week achievable for US women? J Sci Med Sport 2019. [DOI: 10.1016/j.jsams.2019.08.248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
27
|
Oftedal S, Holliday E, Attia J, Brown W, Collins C, Ewald B, Glozier N, McEvoy M, Morgan P, Plotnikoff R, Stamatakis E, Vandelanotte C, Duncan M. Daily steps and diet quality, but not sleep, are related to mortality in older Australians. J Sci Med Sport 2019. [DOI: 10.1016/j.jsams.2019.08.244] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
28
|
Brown W, Mielke G, Mena G, Lamerton T, Keating S, Haakstad L. Physical activity/exercise and pregnancy – updating knowledge and understanding challenges for guideline development. J Sci Med Sport 2019. [DOI: 10.1016/j.jsams.2019.08.052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
|
29
|
Abstract
Cre recombinase-mediated DNA recombination is an established method for conditional control of gene expression in animal models. Regulation of its activity has been accomplished to impart spatial and/or temporal control over recombination of the target gene. In this chapter, optical control of Cre recombinase in developing zebrafish embryos through genetic code expansion is discussed. This method takes advantage of an evolved aminoacyl tRNA synthetase and tRNA pair that can incorporate an unnatural amino acid (UAA) into proteins in response to an amber stop codon (TAG). Genetic code expansion is used to replace a lysine residue critical to Cre recombinase function with a photocaged analogue of lysine, successfully blocking DNA recombination until irradiation with 405nm light. Use of optically controlled Cre recombinase for cell-lineage tracing experiments in zebrafish embryos is highlighted, demonstrating the ability to target small populations of cells at different developmental time points for recombination. Optically controlled Cre recombinase showed no background activity and precise activation upon irradiation, making it a useful new tool for studying development and disease in the zebrafish embryo.
Collapse
Affiliation(s)
- Wes Brown
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, United States
| | - Alexander Deiters
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, United States.
| |
Collapse
|
30
|
Chen S, Redfors B, Serruys P, Kappetein A, Crowley A, Ben-Yehuda O, Srdanovic I, Lembo N, Brown W, Sabik J, Stone G. IMPACT OF TREATMENT WITH ANGIOTENSIN-CONVERTING ENZYME INHIBITORS OR RECEPTOR BLOCKERS ON REVASCULARIZATION AFTER PERCUTANEOUS CORONARY INTERVENTION AND CORONARY ARTERY BYPASS GRAFTING FOR LEFT MAIN CORONARY ARTERY DISEASE: ANALYSIS FROM THE EXCEL TRIAL. J Am Coll Cardiol 2019. [DOI: 10.1016/s0735-1097(19)31799-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
31
|
Abstract
Expanding the genetic code to enable the incorporation of unnatural amino acids into proteins in biological systems provides a powerful tool for studying protein structure and function. While this technology has been mostly developed and applied in bacterial and mammalian cells, it recently expanded into animals, including worms, fruit flies, zebrafish, and mice. In this review, we highlight recent advances toward the methodology development of genetic code expansion in animal model organisms. We further illustrate the applications, including proteomic labeling in fruit flies and mice and optical control of protein function in mice and zebrafish. We summarize the challenges of unnatural amino acid mutagenesis in animals and the promising directions toward broad application of this emerging technology.
Collapse
Affiliation(s)
- Wes Brown
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15237, United States
| | - Jihe Liu
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15237, United States
| | - Alexander Deiters
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15237, United States
| |
Collapse
|
32
|
Abstract
Cell-lineage tracing is used to study embryo development and stem-cell differentiation as well as to document tumor cell heterogeneity. Cre recombinase-mediated cell labeling is the preferred approach; however, its utility is restricted by when and where DNA recombination takes place. We generated a photoactivatable Cre recombinase by replacing a critical residue in its active site with a photocaged lysine derivative through genetic code expansion in zebrafish embryos. This allows high spatiotemporal control of DNA recombination by using 405 nm irradiation. Importantly, no background activity is seen before irradiation, and, after light-triggered removal of the caging group, Cre recombinase activity is restored. We demonstrate the utility of this tool as a cell-lineage tracer through its activation in different regions and at different time points in the early embryo. Direct control of Cre recombinase by light will allow more precise DNA recombination, thereby enabling more nuanced studies of metazoan development and disease.
Collapse
Affiliation(s)
- Wes Brown
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA
| | - Jihe Liu
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA
| | - Michael Tsang
- Department of Developmental Biology, University of Pittsburgh, 3501 Fifth Avenue, Pittsburgh, PA, 15260, USA
| | - Alexander Deiters
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, PA, 15260, USA
| |
Collapse
|
33
|
Tang WW, McGee P, Lachin JM, Li DY, Hoogwerf B, Hazen SL, Nathan D, Zinman B, Crofford O, Genuth S, Brown‐Friday J, Crandall J, Engel H, Engel S, Martinez H, Phillips M, Reid M, Shamoon H, Sheindlin J, Gubitosi‐Klug R, Mayer L, Pendegast S, Zegarra H, Miller D, Singerman L, Smith‐Brewer S, Novak M, Quin J, Genuth S, Palmert M, Brown E, McConnell J, Pugsley P, Crawford P, Dahms W, Gregory N, Lackaye M, Kiss S, Chan R, Orlin A, Rubin M, Brillon D, Reppucci V, Lee T, Heinemann M, Chang S, Levy B, Jovanovic L, Richardson M, Bosco B, Dwoskin A, Hanna R, Barron S, Campbell R, Bhan A, Kruger D, Jones J, Edwards P, Bhan A, Carey J, Angus E, Thomas A, Galprin A, McLellan M, Whitehouse F, Bergenstal R, Johnson M, Gunyou K, Thomas L, Laechelt J, Hollander P, Spencer M, Kendall D, Cuddihy R, Callahan P, List S, Gott J, Rude N, Olson B, Franz M, Castle G, Birk R, Nelson J, Freking D, Gill L, Mestrezat W, Etzwiler D, Morgan K, Aiello L, Golden E, Arrigg P, Asuquo V, Beaser R, Bestourous L, Cavallerano J, Cavicchi R, Ganda O, Hamdy O, Kirby R, Murtha T, Schlossman D, Shah S, Sharuk G, Silva P, Silver P, Stockman M, Sun J, Weimann E, Wolpert H, Aiello L, Jacobson A, Rand L, Rosenzwieg J, Nathan D, Larkin M, Christofi M, Folino K, Godine J, Lou P, Stevens C, Anderson E, Bode H, Brink S, Cornish C, Cros D, Delahanty L, eManbey ., Haggan C, Lynch J, McKitrick C, Norman D, Moore D, Ong M, Taylor C, Zimbler D, Crowell S, Fritz S, Hansen K, Gauthier‐Kelly C, Service F, Ziegler G, Barkmeier A, Schmidt L, French B, Woodwick R, Rizza R, Schwenk W, Haymond M, Pach J, Mortenson J, Zimmerman B, Lucas A, Colligan R, Luttrell L, Lopes‐Virella M, Caulder S, Pittman C, Patel N, Lee K, Nutaitis M, Fernandes J, Hermayer K, Kwon S, Blevins A, Parker J, Colwell J, Lee D, Soule J, Lindsey P, Bracey M, Farr A, Elsing S, Thompson T, Selby J, Lyons T, Yacoub‐Wasef S, Szpiech M, Wood D, Mayfield R, Molitch M, Adelman D, Colson S, Jampol L, Lyon A, Gill M, Strugula Z, Kaminski L, Mirza R, Simjanoski E, Ryan D, Johnson C, Wallia A, Ajroud‐Driss S, Astelford P, Leloudes N, Degillio A, Schaefer B, Mudaliar S, Lorenzi G, Goldbaum M, Jones K, Prince M, Swenson M, Grant I, Reed R, Lyon R, Kolterman O, Giotta M, Clark T, Friedenberg G, Sivitz W, Vittetoe B, Kramer J, Bayless M, Zeitler R, Schrott H, Olson N, Snetselaar L, Hoffman R, MacIndoe J, Weingeist T, Fountain C, Miller R, Johnsonbaugh S, Patronas M, Carney M, Mendley S, Salemi P, Liss R, Hebdon M, Counts D, Donner T, Gordon J, Hemady R, Kowarski A, Ostrowski D, Steidl S, Jones B, Herman W, Martin C, Pop‐Busui R, Greene D, Stevens M, Burkhart N, Sandford T, Floyd J, Bantle J, Flaherty N, Terry J, Koozekanani D, Montezuma S, Wimmergren N, Rogness B, Mech M, Strand T, Olson J, McKenzie L, Kwong C, Goetz F, Warhol R, Hainsworth D, Goldstein D, Hitt S, Giangiacomo J, Schade D, Canady J, Burge M, Das A, Avery R, Ketai L, Chapin J, Schluter M, Rich J, Johannes C, Hornbeck D, Schutta M, Bourne P, Brucker A, Braunstein S, Schwartz S, Maschak‐Carey B, Baker L, Orchard T, Cimino L, Songer T, Doft B, Olson S, Becker D, Rubinstein D, Bergren R, Fruit J, Hyre R, Palmer C, Silvers N, Lobes L, Rath PP, Conrad P, Yalamanchi S, Wesche J, Bratkowksi M, Arslanian S, Rinkoff J, Warnicki J, Curtin D, Steinberg D, Vagstad G, Harris R, Steranchak L, Arch J, Kelly K, Ostrosaka P, Guiliani M, Good M, Williams T, Olsen K, Campbell A, Shipe C, Conwit R, Finegold D, Zaucha M, Drash A, Morrison A, Malone J, Bernal M, Pavan P, Grove N, Tanaka E, McMillan D, Vaccaro‐Kish J, Babbione L, Solc H, DeClue T, Dagogo‐Jack S, Wigley C, Ricks H, Kitabchi A, Chaum E, Murphy M, Moser S, Meyer D, Iannacone A, Yoser S, Bryer‐Ash M, Schussler S, Lambeth H, Raskin P, Strowig S, Basco M, Cercone S, Zinman B, Barnie A, Devenyi R, Mandelcorn M, Brent M, Rogers S, Gordon A, Bakshi N, Perkins B, Tuason L, Perdikaris F, Ehrlich R, Daneman D, Perlman K, Ferguson S, Palmer J, Fahlstrom R, de Boer I, Kinyoun J, Van Ottingham L, Catton S, Ginsberg J, McDonald C, Harth J, Driscoll M, Sheidow T, Mahon J, Canny C, Nicolle D, Colby P, Dupre J, Hramiak I, Rodger N, Jenner M, Smith T, Brown W, May M, Lipps Hagan J, Agarwal A, Adkins T, Lorenz R, Feman S, Survant L, White N, Levandoski L, Grand G, Thomas M, Joseph D, Blinder K, Shah G, Burgess D, Boniuk I, Santiago J, Tamborlane W, Gatcomb P, Stoessel K, Ramos P, Fong K, Ossorio P, Ahern J, Gubitosi‐Klug R, Meadema‐Mayer L, Beck C, Farrell K, Genuth S, Quin J, Gaston P, Palmert M, Trail R, Dahms W, Lachin J, Backlund J, Bebu I, Braffett B, Diminick L, Gao X, Hsu W, Klumpp K, Pan H, Trapani V, Cleary P, McGee P, Sun W, Villavicencio S, Anderson K, Dews L, Younes N, Rutledge B, Chan K, Rosenberg D, Petty B, Determan A, Kenny D, Williams C, Cowie C, Siebert C, Steffes M, Arends V, Bucksa J, Nowicki M, Chavers B, O'Leary D, Polak J, Harrington A, Funk L, Crow R, Gloeb B, Thomas S, O'Donnell C, Soliman E, Zhang Z, Li Y, Campbell C, Keasler L, Hensley S, Hu J, Barr M, Taylor T, Prineas R, Feldman E, Albers J, Low P, Sommer C, Nickander K, Speigelberg T, Pfiefer M, Schumer M, Moran M, Farquhar J, Ryan C, Sandstrom D, Williams T, Geckle M, Cupelli E, Thoma F, Burzuk B, Woodfill T, Danis R, Blodi B, Lawrence D, Wabers H, Gangaputra S, Neill S, Burger M, Dingledine J, Gama V, Sussman R, Davis M, Hubbard L, Budoff M, Darabian S, Rezaeian P, Wong N, Fox M, Oudiz R, Kim L, Detrano R, Cruickshanks K, Dalton D, Bainbridge K, Lima J, Bluemke D, Turkbey E, der Geest ., Liu C, Malayeri A, Jain A, Miao C, Chahal H, Jarboe R, Nathan D, Monnier V, Sell D, Strauch C, Hazen S, Pratt A, Tang W, Brunzell J, Purnell J, Natarajan R, Miao F, Zhang L, Chen Z, Paterson A, Boright A, Bull S, Sun L, Scherer S, Lopes‐Virella M, Lyons T, Jenkins A, Klein R, Virella G, Jaffa A, Carter R, Stoner J, Garvey W, Lackland D, Brabham M, McGee D, Zheng D, Mayfield R, Maynard J, Wessells H, Sarma A, Jacobson A, Dunn R, Holt S, Hotaling J, Kim C, Clemens Q, Brown J, McVary K. Oxidative Stress and Cardiovascular Risk in Type 1 Diabetes Mellitus: Insights From the DCCT/EDIC Study. J Am Heart Assoc 2018. [PMCID: PMC6015340 DOI: 10.1161/jaha.117.008368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background
Hyperglycemia leading to increased oxidative stress is implicated in the increased risk for the development of macrovascular and microvascular complications in patients with type 1 diabetes mellitus.
Methods and Results
A random subcohort of 349 participants was selected from the
DCCT
/
EDIC
(Diabetes Control and Complications Trial/Epidemiology of Diabetes Interventions and Complications) cohort. This included 320 controls and 29 cardiovascular disease cases that were augmented with 98 additional known cases to yield a case cohort of 447 participants (320 controls, 127 cases). Biosamples from
DCCT
baseline, year 1, and closeout of
DCCT
, and 1 to 2 years post‐
DCCT
(
EDIC
years 1 and 2) were measured for markers of oxidative stress, including plasma myeloperoxidase, paraoxonase activity, urinary F
2α
isoprostanes, and its metabolite, 2,3 dinor‐8
iso
prostaglandin F
2α
. Following adjustment for glycated hemoblobin and weighting the observations inversely proportional to the sampling selection probabilities, higher paraoxonase activity, reflective of antioxidant activity, and 2,3 dinor‐8
iso
prostaglandin F
2α
, an oxidative marker, were significantly associated with lower risk of cardiovascular disease (−4.5% risk for 10% higher paraoxonase,
P
<0.003; −5.3% risk for 10% higher 2,3 dinor‐8
iso
prostaglandin F
2α
,
P
=0.0092). In contrast, the oxidative markers myeloperoxidase and F
2α
isoprostanes were not significantly associated with cardiovascular disease after adjustment for glycated hemoblobin. There were no significant differences between
DCCT
intensive and conventional treatment groups in the change in all biomarkers across time segments.
Conclusions
Heightened antioxidant activity (rather than diminished oxidative stress markers) is associated with lower cardiovascular disease risk in type 1 diabetes mellitus, but these biomarkers did not change over time with intensification of glycemic control.
Clinical Trial Registration
URL
:
https://www.clinicaltrials.gov
. Unique identifiers:
NCT
00360815 and
NCT
00360893.
Collapse
Affiliation(s)
- W.H. Wilson Tang
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH
- Department of Cardiovascular Medicine, Heart and Vascular Institute, Cleveland Clinic, Cleveland, OH
| | - Paula McGee
- The Biostatistics Center, George Washington University, Rockville, MD
| | - John M. Lachin
- The Biostatistics Center, George Washington University, Rockville, MD
| | - Daniel Y. Li
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH
| | | | - Stanley L. Hazen
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH
- Department of Cardiovascular Medicine, Heart and Vascular Institute, Cleveland Clinic, Cleveland, OH
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Selinger C, Elston B, Gupta R, Stalley P, Boyle R, Brown W, Soper J, Schatz J, Karim R, McCarthy S, Bonar F, Cheah A, Maclean F, Vargas C, Cooper W, O'Toole S, Mahar A. Examples of the diagnostic utility of USP6 FISH in soft tissue and bone pathology. Pathology 2018. [DOI: 10.1016/j.pathol.2017.11.055] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
35
|
Clothier J, Hinch G, Brown W, Small A. Equine gestational length and location: is there more that the research could be telling us? Aust Vet J 2017; 95:454-461. [DOI: 10.1111/avj.12653] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 09/27/2016] [Accepted: 01/25/2017] [Indexed: 11/30/2022]
Affiliation(s)
- J Clothier
- CSIRO Agriculture, FD McMaster Laboratory; New England Highway; Armidale New South Wales Australia
- School of Environmental and Rural Sciences; University of New England; NSW Australia
| | - G Hinch
- School of Environmental and Rural Sciences; University of New England; NSW Australia
| | - W Brown
- School of Environmental and Rural Sciences; University of New England; NSW Australia
| | - A Small
- CSIRO Agriculture, FD McMaster Laboratory; New England Highway; Armidale New South Wales Australia
| |
Collapse
|
36
|
Brown W. Taking it seriously and regularly: Reflections on research into physical activity, sedentary behaviour and health 1958–2017. J Sci Med Sport 2017. [DOI: 10.1016/j.jsams.2017.09.377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
37
|
Burke L, Brown W. Weighty Issues Symposium. J Sci Med Sport 2017. [DOI: 10.1016/j.jsams.2017.09.375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
38
|
Cullen A, Barnett A, Komesaroff P, Brown W, O'Brien K, Hall W, Carter A. A qualitative study of overweight and obese Australians' views of food addiction. Appetite 2017; 115:62-70. [DOI: 10.1016/j.appet.2017.02.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2016] [Revised: 01/31/2017] [Accepted: 02/08/2017] [Indexed: 12/25/2022]
|
39
|
Riley M, Brown W, Srinivas S, Johnston L, Tompkins L, Madison S, Schaffner T. Epidemiology and Burden of Mucosal Barrier Injury Laboratory-Confirmed Bloodstream Infections in Bone Marrow Transplant and Hematology-Oncology Units. Am J Infect Control 2017. [DOI: 10.1016/j.ajic.2017.04.063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
40
|
Narayanappa H, Boyle R, Karim R, Brown W, Cooper W, Selinger C, Bonar F, Mahar A. CIC-rearranged sarcoma: a case report. Pathology 2017. [DOI: 10.1016/j.pathol.2016.09.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
41
|
Badgery W, Brown W. Foreword to ‘Orange EverGraze proof site’. Anim Prod Sci 2017. [DOI: 10.1071/anv57n9_fo] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
42
|
|
43
|
Hayman M, Brown W. Development of a new evidence-based SMA position statement on exercise in pregnancy and the post-partum period. J Sci Med Sport 2017. [DOI: 10.1016/j.jsams.2017.01.102] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
44
|
Badgery WB, Mitchell D, Millar GD, Broadfoot K, Michalk DL, Cranney P, Brown W. Designing a grazing-system experiment for variable native pastures and flexible lamb-production systems. Anim Prod Sci 2017. [DOI: 10.1071/an15856] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Grazing-system experiments address complex interactions among animals, pastures, soils, climate and management. As part of the national EverGraze program, a grazing-system experiment was designed to determine how the intensity of grazing management, from continuous grazing (P01) to flexible 4- and 20-paddock rotational systems (P04 and P20), influences the profitability and sustainability of a Merino ewe, terminal sire, lamb production system grazed on heterogeneous native pastures. When implementing such an experiment, it is important to understand and characterise landscape variability, and include this in the design of the experiment. A second challenge for grazing-system research is to operate experimental systems with sufficient flexibility to adequately represent commercial production systems and maintain even utilisation across treatments. The present paper addresses the following two issues: (1) the process used to characterise the potential productivity of variable native pastures and the results of this characterisation; and (2) the development of flexible systems that adequately represent commercial production within an experiment. This was undertaken with input from a project-steering committee called the EverGraze Regional Group, comprising producers, extension staff and private consultants. Prior to the commencement, the site was mapped into three production zones, namely, high (HPZ), medium (MPZ) and low (LPZ), by visually estimating green herbage mass in late spring and marking boundaries between zones with a GPS. The production zones represented differences in soil properties (gravel, pH and available P) and pasture composition, and were used to balance potential production among plots within the same replication. Grazing-system options were evaluated using the sustainable grazing systems pasture model to help choose an appropriate starting stocking rate. The initial stocking rate chosen for the spring-lambing systems was 5.4 ewes/ha. The modelling predicted large variations in feed availability and quality over summer among years; flexible management criteria were therefore developed, including variable sale time for lambs, to utilise the greater feed supply in better seasons. Minimum-pasture benchmarks (>0.8 t DM/ha standing herbage mass and >80% ground cover) and variable green herbage-mass targets were designed to sustain high levels of livestock production and prevent pasture degradation. Criteria for adjusting ewe numbers were developed, but were constrained to pre-joining (March), scanning (July) and post-weaning (December), being consistent with commercial practices. The experiment incorporated flexible management rules as these were considered integral to the successful management of commercial grazing systems.
Collapse
|
45
|
Brown W, Ryser E, Gorman L, Steinmaus S, Vorst K. Temperatures experienced by fresh-cut leafy greens during retail storage and display. ACTA ACUST UNITED AC 2016. [DOI: 10.17660/actahortic.2016.1141.10] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
46
|
Hoban J, Hopkins D, Kirby N, Collins D, Dunshea F, Kerr M, Bailes K, Cottrell J, Holman B, Brown W, Ponnampalam E. Application of small angle X-ray scattering synchrotron technology for measuring ovine meat quality. Meat Sci 2016; 117:122-9. [DOI: 10.1016/j.meatsci.2016.03.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 03/02/2016] [Accepted: 03/03/2016] [Indexed: 11/26/2022]
|
47
|
Williams E, Gerrard A, Brown W, Shire E. 12COMPREHENSIVELY EDUCATING JUNIOR DOCTORS ON DNACPR POLICY AT INDUCTION IMPROVES ACCURACY OF DNACPR FORM COMPLETION AND DOCUMENTATION OF RESUSCITATION DECISIONS: Table 1. Age Ageing 2016. [DOI: 10.1093/ageing/afw024.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
|
48
|
Chiche D, Brown W, Walker P. (420) NEO6860, a novel modality selective TRPV1 antagonist: results from a phase I, double-blind, placebo-controlled study in healthy subjects. The Journal of Pain 2016. [DOI: 10.1016/j.jpain.2016.01.397] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
49
|
Brown W. Improving recruitment, compliance, adherence and maintenance in physical activity interventions in adults. J Sci Med Sport 2015. [DOI: 10.1016/j.jsams.2015.12.383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
50
|
Gilson N, Ng N, Pavey T, Ryde G, Straker L, Brown W. Project Energise: The impact of real-time prompts on sedentary and physically active work time in Australian office workers. J Sci Med Sport 2015. [DOI: 10.1016/j.jsams.2015.12.403] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|