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Barrier J, Kim M, Kumar RK, Xin N, Kumaravadivel P, Hague L, Nguyen E, Berdyugin AI, Moulsdale C, Enaldiev VV, Prance JR, Koppens FHL, Gorbachev RV, Watanabe K, Taniguchi T, Glazman LI, Grigorieva IV, Fal'ko VI, Geim AK. One-dimensional proximity superconductivity in the quantum Hall regime. Nature 2024; 628:741-745. [PMID: 38658686 DOI: 10.1038/s41586-024-07271-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Accepted: 03/05/2024] [Indexed: 04/26/2024]
Abstract
Extensive efforts have been undertaken to combine superconductivity and the quantum Hall effect so that Cooper-pair transport between superconducting electrodes in Josephson junctions is mediated by one-dimensional edge states1-6. This interest has been motivated by prospects of finding new physics, including topologically protected quasiparticles7-9, but also extends into metrology and device applications10-13. So far it has proven challenging to achieve detectable supercurrents through quantum Hall conductors2,3,6. Here we show that domain walls in minimally twisted bilayer graphene14-18 support exceptionally robust proximity superconductivity in the quantum Hall regime, allowing Josephson junctions to operate in fields close to the upper critical field of superconducting electrodes. The critical current is found to be non-oscillatory and practically unchanging over the entire range of quantizing fields, with its value being limited by the quantum conductance of ballistic, strictly one-dimensional, electronic channels residing within the domain walls. The system described is unique in its ability to support Andreev bound states at quantizing fields and offers many interesting directions for further exploration.
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Affiliation(s)
- Julien Barrier
- Department of Physics and Astronomy, University of Manchester, Manchester, UK.
- National Graphene Institute, University of Manchester, Manchester, UK.
| | - Minsoo Kim
- Department of Physics and Astronomy, University of Manchester, Manchester, UK
- Department of Applied Physics, Kyung Hee University, Yong-in, South Korea
| | - Roshan Krishna Kumar
- ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona, Spain
| | - Na Xin
- Department of Physics and Astronomy, University of Manchester, Manchester, UK.
- Department of Chemistry, Zhejiang University, Hangzhou, China.
| | - P Kumaravadivel
- Department of Physics and Astronomy, University of Manchester, Manchester, UK
- National Graphene Institute, University of Manchester, Manchester, UK
| | - Lee Hague
- National Graphene Institute, University of Manchester, Manchester, UK
| | - E Nguyen
- Department of Physics and Astronomy, University of Manchester, Manchester, UK
- National Graphene Institute, University of Manchester, Manchester, UK
| | - A I Berdyugin
- Department of Physics and Astronomy, University of Manchester, Manchester, UK
- National Graphene Institute, University of Manchester, Manchester, UK
| | - Christian Moulsdale
- Department of Physics and Astronomy, University of Manchester, Manchester, UK
- National Graphene Institute, University of Manchester, Manchester, UK
| | - V V Enaldiev
- Department of Physics and Astronomy, University of Manchester, Manchester, UK
- National Graphene Institute, University of Manchester, Manchester, UK
| | - J R Prance
- Department of Physics, Lancaster University, Lancaster, UK
| | - F H L Koppens
- ICFO - Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona, Spain
| | - R V Gorbachev
- Department of Physics and Astronomy, University of Manchester, Manchester, UK
- National Graphene Institute, University of Manchester, Manchester, UK
| | - K Watanabe
- National Institute for Materials Science, Tsukuba, Japan
| | - T Taniguchi
- National Institute for Materials Science, Tsukuba, Japan
| | - L I Glazman
- Department of Physics, Yale University, New Haven, CT, USA
| | - I V Grigorieva
- Department of Physics and Astronomy, University of Manchester, Manchester, UK
- National Graphene Institute, University of Manchester, Manchester, UK
| | - V I Fal'ko
- Department of Physics and Astronomy, University of Manchester, Manchester, UK
- National Graphene Institute, University of Manchester, Manchester, UK
- Henry Royce Institute for Advanced Materials, University of Manchester, Manchester, UK
| | - A K Geim
- Department of Physics and Astronomy, University of Manchester, Manchester, UK.
- National Graphene Institute, University of Manchester, Manchester, UK.
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Liu ZS, Sinha S, Bannister M, Song A, Arriaga-Gomez E, McKeeken AJ, Bonner EA, Hanson BK, Sarchi M, Takashima K, Zong D, Corral VM, Nguyen E, Yoo J, Chiraphapphaiboon W, Leibson C, McMahon MC, Rai S, Swisher EM, Sachs Z, Chatla S, Stirewalt DL, Deeg HJ, Skorski T, Papapetrou EP, Walter MJ, Graubert TA, Doulatov S, Lee SC, Nguyen HD. R-Loop Accumulation in Spliceosome Mutant Leukemias Confers Sensitivity to PARP1 Inhibition by Triggering Transcription-Replication Conflicts. Cancer Res 2024; 84:577-597. [PMID: 37967363 PMCID: PMC10922727 DOI: 10.1158/0008-5472.can-23-3239] [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: 10/16/2023] [Revised: 11/09/2023] [Accepted: 11/13/2023] [Indexed: 11/17/2023]
Abstract
RNA splicing factor (SF) gene mutations are commonly observed in patients with myeloid malignancies. Here we showed that SRSF2- and U2AF1-mutant leukemias are preferentially sensitive to PARP inhibitors (PARPi), despite being proficient in homologous recombination repair. Instead, SF-mutant leukemias exhibited R-loop accumulation that elicited an R-loop-associated PARP1 response, rendering cells dependent on PARP1 activity for survival. Consequently, PARPi induced DNA damage and cell death in SF-mutant leukemias in an R-loop-dependent manner. PARPi further increased aberrant R-loop levels, causing higher transcription-replication collisions and triggering ATR activation in SF-mutant leukemias. Ultimately, PARPi-induced DNA damage and cell death in SF-mutant leukemias could be enhanced by ATR inhibition. Finally, the level of PARP1 activity at R-loops correlated with PARPi sensitivity, suggesting that R-loop-associated PARP1 activity could be predictive of PARPi sensitivity in patients harboring SF gene mutations. This study highlights the potential of targeting different R-loop response pathways caused by spliceosome gene mutations as a therapeutic strategy for treating cancer. SIGNIFICANCE Spliceosome-mutant leukemias accumulate R-loops and require PARP1 to resolve transcription-replication conflicts and genomic instability, providing rationale to repurpose FDA-approved PARP inhibitors for patients carrying spliceosome gene mutations.
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Affiliation(s)
- Zhiyan Silvia Liu
- Molecular Pharmacology and Therapeutics Graduate Program, Department of Pharmacology, University of Minnesota, Minneapolis, MN, USA
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
- These authors contributed equally
| | - Sayantani Sinha
- Translational Science and Therapeutics Division, Fred Hutchinson Cancer Center, Seattle, WA, USA
- These authors contributed equally
| | - Maxwell Bannister
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
| | - Axia Song
- Translational Science and Therapeutics Division, Fred Hutchinson Cancer Center, Seattle, WA, USA
| | - Erica Arriaga-Gomez
- Translational Science and Therapeutics Division, Fred Hutchinson Cancer Center, Seattle, WA, USA
| | - Alexander J. McKeeken
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
- Bioinformatics and Computational Biology Program, University of Minnesota, Minneapolis, MN, USA
| | - Elizabeth A. Bonner
- Translational Science and Therapeutics Division, Fred Hutchinson Cancer Center, Seattle, WA, USA
- Molecular and Cellular Biology Graduate Program, University of Washington, Seattle, WA, USA
| | - Benjamin K. Hanson
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
- Department of Biochemistry, Molecular Biology, and Biophysics Graduate Program, University of Minnesota, Minneapolis, MN, USA
| | - Martina Sarchi
- Division of Hematology and Oncology, Department of Medicine, University of Washington, Seattle, WA, USA
- Department of Molecular Medicine, University of Pavia, 27100 Pavia PV, Italy
| | - Kouhei Takashima
- Department of Oncological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Institute for Regenerative Medicine and Black Family Stem Cell Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Center for Advancement of Blood Cancer Therapies, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Dawei Zong
- Molecular Pharmacology and Therapeutics Graduate Program, Department of Pharmacology, University of Minnesota, Minneapolis, MN, USA
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
| | - Victor M. Corral
- Molecular Pharmacology and Therapeutics Graduate Program, Department of Pharmacology, University of Minnesota, Minneapolis, MN, USA
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
| | - Evan Nguyen
- Translational Science and Therapeutics Division, Fred Hutchinson Cancer Center, Seattle, WA, USA
| | - Jennifer Yoo
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
| | | | - Cassandra Leibson
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
| | - Matthew C. McMahon
- Molecular Pharmacology and Therapeutics Graduate Program, Department of Pharmacology, University of Minnesota, Minneapolis, MN, USA
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
| | - Sumit Rai
- Massachusetts General Hospital Cancer Center, Charlestown, MA
| | - Elizabeth M. Swisher
- Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of Washington School of Medicine, Seattle, WA 98195
| | - Zohar Sachs
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
- Division of Hematology, Oncology, and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN, USA
| | - Srinivas Chatla
- Fels Cancer Institute for Personalized Medicine, Lewis Katz School of Medicine, Temple University, Philadelphia, PA 19140, USA
| | - Derek L. Stirewalt
- Translational Science and Therapeutics Division, Fred Hutchinson Cancer Center, Seattle, WA, USA
- Clinical Research Division, Fred Hutchinson Cancer Center, Seattle, WA, USA
| | - H. Joachim Deeg
- Clinical Research Division, Fred Hutchinson Cancer Center, Seattle, WA, USA
| | - Tomasz Skorski
- Fels Cancer Institute for Personalized Medicine, Lewis Katz School of Medicine, Temple University, Philadelphia, PA 19140, USA
- Department of Cancer and Cellular Biology, Lewis Katz School of Medicine, Temple University, Philadelphia, PA 19140, USA
| | - Eirini P. Papapetrou
- Department of Oncological Sciences, Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Institute for Regenerative Medicine and Black Family Stem Cell Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA
- Center for Advancement of Blood Cancer Therapies, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Matthew J. Walter
- Division of Oncology, Department of Internal Medicine, Washington University School of Medicine, St Louis, MO, USA
| | | | - Sergei Doulatov
- Division of Hematology and Oncology, Department of Medicine, University of Washington, Seattle, WA, USA
- Department of Genome Sciences, University of Washington, Seattle, WA, USA
- Institute of Stem Cell and Regenerative Medicine, University of Washington, Seattle, WA, USA
| | - Stanley C. Lee
- Translational Science and Therapeutics Division, Fred Hutchinson Cancer Center, Seattle, WA, USA
- Department of Laboratory Medicine & Pathology, University of Washington, Seattle, WA, USA
| | - Hai Dang Nguyen
- Masonic Cancer Center, University of Minnesota, Minneapolis, MN, USA
- Department of Pharmacology, University of Minnesota, Minneapolis, MN, USA
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Nguyen E, Bennett R, MacDonald C, Wang A, Liu W. High Resolution Imaging with Focused kV X-Rays for Small Animal Radio-Neuromodulation. Int J Radiat Oncol Biol Phys 2023; 117:e690-e691. [PMID: 37786029 DOI: 10.1016/j.ijrobp.2023.06.2163] [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: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) High precision radiotherapy for small animal radio-neuromodulation requires conformal treatment to very small targets down to 2.5 mm. A focused kV technique based on novel usage of polycapillary x-ray lenses can focus x-ray beams to <0.2 mm in diameter, which is ideal for such uses. Such application also requires high resolution CT images for treatment planning and setup, which was hard to achieve using conventional x-ray tube. In this work, we demonstrate the feasibility of using a virtual focal spot generated with an x-ray lens to perform high-resolution CBCT acquisition. MATERIALS/METHODS The experiment with x-ray lens was set up on an x-ray tabletop system to generate a virtual focal spot. A pinhole image was acquired for the virtual focal spot and compared with the one acquired with the conventional focal spot without the lens. The planar imaging resolution with and without the lens were evaluated using a line pair resolution phantom. The spatial resolution of the two settings were estimated by reconstructing a 0.15-mm wire phantom and comparing its full width half maximum (FWHM). A CBCT scan of a rodent head was also acquired to further demonstrate the improved resolution using the x-ray lens. RESULTS Compared to conventional imaging acquisition with a measured x-ray focal spot of 0.395 mm FWHM, the virtual focal spot size was measured at 0.175 mm. The reduction in focal spot size with lens leads to an almost doubled planar imaging resolution and a 26% enhancement in 3D spatial resolution. A realistic CBCT acquisition of a rodent head mimicked the imaging acquisition step for radio-neuromodulation and further showed the improved visualization for fine structures. CONCLUSION This work demonstrated that the focused kV x-ray technique was capable of generating small focal spot size of <0.2 mm. The proposed method provides an adaptive imaging platform to acquire x-ray and CBCT images for treatment planning and setup with improved spatial resolution compared to conventional CBCT image acquisition.
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Affiliation(s)
- E Nguyen
- Department of Radiation Oncology, Stanford University, Stanford, CA
| | - R Bennett
- Department of Radiology, Stanford University, Stanford, CA
| | - C MacDonald
- Department of Physics, SUNY - Albany, Albany, NY
| | - A Wang
- Department of Radiology, Stanford University, Stanford, CA
| | - W Liu
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA
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Rosenfeld M, Nguyen E, Fogarty B, Berlinski A, Sawicki G, Hartzler A. 182 A qualitative needs assessment of people with cystic fibrosis and research coordinators to inform future clinical trials incorporating home spirometry as an endpoint. J Cyst Fibros 2022. [DOI: 10.1016/s1569-1993(22)00872-4] [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: 11/06/2022]
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5
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Figueroa S, Joshee S, Wybrecht A, Yco M, DiMassa V, Kelley E, Nguyen E, Bain K, Eckert K. Implementation of a Culinary Medicine Curriculum to Increase Confidence and Competency Among Preclinical Medical Students. J Acad Nutr Diet 2022. [DOI: 10.1016/j.jand.2022.06.155] [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: 10/15/2022]
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6
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Nguyen E, Poli R, Sklodowski K, Dozio V, Lanzós A, Beeler K, Romano E. 20P Identifying novel biomarkers with deep proteomics profiling and survival analysis in NSCLC patients treated with anti-PD-1-blockade. Ann Oncol 2021. [DOI: 10.1016/j.annonc.2021.10.036] [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] Open
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7
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Ng Y, Nguyen E, Bei B, Hamilton G, Rajaratnam S, Ou C, Mansfield D. P103 Impact of the COVID-19 pandemic on the sleep of patients of a multidisciplinary sleep clinic. SLEEP Advances 2021. [PMCID: PMC8500137 DOI: 10.1093/sleepadvances/zpab014.147] [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] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
Introduction
This study aimed to assess the impact of the COVID-19 pandemic on the sleep of adult patients of a multidisciplinary sleep clinic.
Methods
Patients were invited to complete online surveys: Survey 1 in October 2020 (increased COVID-19 restrictions) followed by Survey 2 in February 2021 (after easing of restrictions for a COVIDSafe summer).
Results
Of the 746 patients invited to participate, 73 completed and 8 partially returned Survey 1 (mean age 50.1 years, range 21–83 years, 58% female). Subsequently, 46 completed and 5 partially answered Survey 2. In Survey 1, 22/74 (29.7%) reported reduced sleep quantity and 31/75 (41.3%) indicated worse sleep quality compared with prior to the pandemic. In Survey 2, 33/46 (71.7%) described unchanged sleep quantity whilst 5/46 (10.9%) reported increased sleep quantity since easing COVID-19 restrictions. 36/46 (78.3%) indicated unchanged sleep quality whereas 5/46 (10.9%) described improved sleep quality since easing restrictions. However, 9/46 (19.6%) reported that their sleep remained worse compared with pre-pandemic. For patients who completed both surveys, there was no significant change in Insomnia Severity Index scores (Survey 1 mean 13.6, Survey 2 mean 12.9, mean difference -0.67 [95%CI -2.02, 0.68], p=0.32) or PROMIS Sleep-Related Impairment 8a T-scores (Survey 1 mean 59.0, Survey 2 mean 59.5, mean difference 0.44 [95%CI -1.55, 2.42], p=0.66).
Discussion
The COVID-19 pandemic has negatively affected the sleep of 44% of patients. Following easing of restrictions, symptoms of insomnia and sleep-related impairment did not change significantly, and 19.6% reported that their sleep was not back to their pre-pandemic baseline.
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Affiliation(s)
- Y Ng
- Monash University, Notting Hill, Australia
- Monash Lung, Sleep, Allergy and Immunology, Monash Health, Clayton, Australia
| | - E Nguyen
- Monash University, Notting Hill, Australia
| | - B Bei
- Monash University, Notting Hill, Australia
| | - G Hamilton
- Monash University, Notting Hill, Australia
- Monash Lung, Sleep, Allergy and Immunology, Monash Health, Clayton, Australia
| | | | - C Ou
- Monash University, Notting Hill, Australia
| | - D Mansfield
- Monash University, Notting Hill, Australia
- Monash Lung, Sleep, Allergy and Immunology, Monash Health, Clayton, Australia
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Chand S, Rrapi R, Gabel C, Nguyen E, Ko L, Dobry A, Garza-Mayers A, Shah R, St. John J, Strazzula L, Kroshinsky D. LB780 Risk factors predicting Cellulitis diagnosis in a prospective cohort undergoing dermatology consultation in the Emergency Department. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.07.114] [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: 11/29/2022]
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Chand S, Rrapi R, Gabel C, Nguyen E, Dobry A, Garza-Mayers A, Ko L, Shah R, St. John J, Strazzula L, Nigwekar S, Kroshinsky D. LB779 Comparison of outcomes for intravenous and intralesional administration of sodium thiosulfate for treatment of Calciphylaxis. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.07.045] [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: 11/15/2022]
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10
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Chand S, Rrapi R, Lam J, Chakrala T, Yi Z, Song S, Nguyen E, Kroshinsky D. 310 Risk factors associated with detection of cutaneous abscess on ultrasonography in patients with cellulitis. J Invest Dermatol 2021. [DOI: 10.1016/j.jid.2021.02.332] [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]
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11
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Pérol M, Filleron T, Quantin X, Chouaid C, Valette CA, Lena H, Kaderbhai C, Fabre C, Santorelli M, Bensimon L, Burke T, Couch D, Nguyen E, Courtinard C. 109P Real-world evaluation of pembrolizumab monotherapy for PD-L1 positive (TPS>50%) metastatic NSCLC in France. J Thorac Oncol 2021. [DOI: 10.1016/s1556-0864(21)01951-1] [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] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Rosker ES, Barako MT, Nguyen E, DiMarzio D, Kisslinger K, Duan DW, Sandhu R, Goorsky MS, Tice J. Approaching the Practical Conductivity Limits of Aerosol Jet Printed Silver. ACS Appl Mater Interfaces 2020; 12:29684-29691. [PMID: 32496037 DOI: 10.1021/acsami.0c06959] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Previous efforts to directly write conductive metals have been narrowly focused on nanoparticle ink suspensions that require aggressive sintering (>200 °C) and result in low-density, small-grained agglomerates with electrical conductivities <25% of bulk metal. Here, we demonstrate aerosol jet printing of a reactive ink solution and characterize high-density (93%) printed silver traces having near-bulk conductivity and grain sizes greater than the electron mean free path, while only requiring a low-temperature (80 °C) treatment. We have developed a predictive electronic transport model which correlates the microstructure to the measured conductivity and identifies a strategy to approach the practical conductivity limit for printed metals. Our analysis of how grain boundaries and tortuosity contribute to electrical resistivity provides insight into the basic materials science that governs how an ink formulator or process developer might approach improving the conductivity. Transmission line measurements validate that electrical properties are preserved up to 20 GHz, which demonstrates the utility of this technique for printed RF components. This work reveals a new method of producing robust printed electronics that retain the advantages of rapid prototyping and three-dimensional fabrication while achieving the performance necessary for success within the aerospace and communications industries.
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Affiliation(s)
- Eva S Rosker
- NG Next, Northrop Grumman Corporation, 1 Space Park Blvd, Redondo Beach, California 90278, United States
- UCLA Department of Materials Science & Engineering, 420 Westwood Plaza, Los Angeles, California 90095, United States
| | - Michael T Barako
- NG Next, Northrop Grumman Corporation, 1 Space Park Blvd, Redondo Beach, California 90278, United States
| | - Evan Nguyen
- NG Next, Northrop Grumman Corporation, 1 Space Park Blvd, Redondo Beach, California 90278, United States
| | - Don DiMarzio
- NG Next, Northrop Grumman Corporation, 1 Space Park Blvd, Redondo Beach, California 90278, United States
- Center for Functional Nanomaterials, Brookhaven National Laboratory, 735 Brookhaven Avenue, Upton, New York 11973, United States
| | - Kim Kisslinger
- Center for Functional Nanomaterials, Brookhaven National Laboratory, 735 Brookhaven Avenue, Upton, New York 11973, United States
| | - Dah-Weih Duan
- NG Next, Northrop Grumman Corporation, 1 Space Park Blvd, Redondo Beach, California 90278, United States
| | - Rajinder Sandhu
- NG Next, Northrop Grumman Corporation, 1 Space Park Blvd, Redondo Beach, California 90278, United States
| | - Mark S Goorsky
- UCLA Department of Materials Science & Engineering, 420 Westwood Plaza, Los Angeles, California 90095, United States
| | - Jesse Tice
- NG Next, Northrop Grumman Corporation, 1 Space Park Blvd, Redondo Beach, California 90278, United States
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Jia J, Nguyen E, Ravilla A, Sakioka J, Rosenthal E, Gulati M, Lekht I. Abstract No. 646 Natural history of transjugular intrahepatic portosystemic shunts: long-term analysis of survival and protective factors. J Vasc Interv Radiol 2020. [DOI: 10.1016/j.jvir.2019.12.707] [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] Open
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14
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Nguyen E, Kroshinsky D. 626 Assessing the incidence of skin and soft tissue infection in patients on biologics. J Invest Dermatol 2019. [DOI: 10.1016/j.jid.2019.03.702] [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: 11/29/2022]
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Mejia R, Summers K, Cox T, Nguyen E, Sparks A, Van Voorhis B. Effect of body weight on early hormone levels in singleton pregnancies resulting in delivery following in vitro fertilization. Fertil Steril 2018. [DOI: 10.1016/j.fertnstert.2018.07.738] [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: 11/25/2022]
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16
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Nguyen E, Lemieux V, Udell J, Hanneman K, Bhatia S, Ivers N, Harvey P. Reducing Over Investigation of Women with Stable Chest Pain at Low/Intermediate Risk for Coronary Artery Disease: The Rationale for the RESOLVE Trial. Can J Cardiol 2018. [DOI: 10.1016/j.cjca.2018.01.041] [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: 10/17/2022] Open
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17
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Bautista J, Phung S, Nguyen I, Nguyen E, Der D, Vatakencherry G, Lam C. 3:50 PM Abstract No. 395 Comparison of alcohol ablation and radiofrequency ablation for treatment of hepatocellular carcinoma: A retrospective analysis of long-term overall and disease-free survival. J Vasc Interv Radiol 2018. [DOI: 10.1016/j.jvir.2018.01.438] [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: 11/29/2022] Open
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18
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Nguyen E, Caranfa JT, Lyman GH, Kuderer NM, Stirbis C, Wysocki M, Coleman CI, Weeda ER, Kohn CG. Clinical prediction rules for mortality in patients with pulmonary embolism and cancer to guide outpatient management: a meta-analysis. J Thromb Haemost 2018; 16:279-292. [PMID: 29215781 DOI: 10.1111/jth.13921] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [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: 09/17/2017] [Indexed: 01/27/2023]
Abstract
Essentials Clinical prediction rules (CPRs) can stratify patients with pulmonary embolism (PE) and cancer. A meta-analysis was done to assess prognostic accuracy in CPRs for mortality in these patients. Eight studies evaluating ten CPRs were included in this study. CPRs should continue to be used with other patient factors for mortality risk stratification. SUMMARY Background Cancer treatment is commonly complicated by pulmonary embolism (PE), which remains a leading cause of morbidity and mortality in these patients. Some guidelines recommend the use of clinical prediction rules (CPRs) to help clinicians identify patients at low risk of mortality and therefore guide care. Objective To determine and compare the accuracy of available CPRs for identifying cancer patients with PE at low risk of mortality. Methods A literature search of Medline and Scopus (January 2000 to August 2017) was performed. Studies deriving/validating ≥ 1 CPR for early post-PE all-cause mortality were included. A bivariate, random-effects model was used to pool sensitivity and specificity estimates for each CPR. Traditional random-effects meta-analysis was performed to estimate the weighted proportion of patients deemed at low risk of early mortality, mortality in low risk patients and odds ratios for death compared with higher-risk patients. Results Eight studies evaluating 10 CPRs were included. The highest sensitivities were observed with Hestia (98.1%, 95% confidence interval [CI] = 75.6-99.9%) and the EPIPHANY index (97.4%, 95% CI = 93.2-99.0%); sensitivities of remaining rules ranged from 59.9 to 96.6%. Of the six CPRs with sensitivities ≥ 95%, none had specificities > 33%. Random-effects meta-analysis suggested that 6.6-51.6% of cancer patients with PE were at low risk of mortality, 0-14.3% of low-risk patients died and low-risk patients had a 43-94% lower odds of death compared with those at higher risk. Conclusions Because of the limited total body of evidence regarding CPRs, their results, in conjunction with other pertinent patient-specific clinical factors, should continue to be used in identifying appropriate management for PE in patients with cancer.
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Affiliation(s)
- E Nguyen
- Idaho State University College of Pharmacy, Meridian, ID, USA
| | - J T Caranfa
- University of Connecticut School of Medicine, Farmington, CT, USA
| | - G H Lyman
- Fred Hutchinson Cancer Research Center, Seattle, WA, USA
- University of Washington School of Medicine, Seattle, WA, USA
| | - N M Kuderer
- University of Washington School of Medicine, Seattle, WA, USA
| | - C Stirbis
- University of Saint Joseph School of Pharmacy, Hartford, CT, USA
| | - M Wysocki
- University of Connecticut School of Pharmacy, Storrs, CT, USA
| | - C I Coleman
- University of Connecticut School of Pharmacy, Storrs, CT, USA
- UConn/Hartford Hospital Evidence-based Practice Center, Hartford, CT, USA
| | - E R Weeda
- Medical University of South Carolina College of Pharmacy, Charleston, SC, USA
| | - C G Kohn
- University of Connecticut School of Medicine, Farmington, CT, USA
- UConn/Hartford Hospital Evidence-based Practice Center, Hartford, CT, USA
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Ta C, He L, Nguyen E, De Kaspar HM. Prospective Randomized Study Determining Whether a 3-Day Application of Ofloxacin Results in the Selection of Fluoroquinolone-Resistant Coagulase-Negative Staphylococcus. Eur J Ophthalmol 2018. [DOI: 10.1177/112067210601600301] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- C.N. Ta
- Department of Ophthalmology, School of Medicine, Stanford University, Stanford, CA - USA
| | - L. He
- Department of Ophthalmology, School of Medicine, Stanford University, Stanford, CA - USA
| | - E. Nguyen
- Department of Ophthalmology, School of Medicine, Stanford University, Stanford, CA - USA
| | - H. Miño De Kaspar
- Department of Ophthalmology, School of Medicine, Stanford University, Stanford, CA - USA
- Department of Ophthalmology, Ludwig-Maximilians-University, Munich - Germany
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Meenakshi-Sundaram B, Furr JR, Malm-Buatsi E, Boklage B, Nguyen E, Frimberger D, Palmer BW. Reduction in surgical fog with a warm humidified gas management protocol significantly shortens procedure time in pediatric robot-assisted laparoscopic procedures. J Pediatr Urol 2017; 13:489.e1-489.e5. [PMID: 28284732 DOI: 10.1016/j.jpurol.2017.01.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 01/25/2017] [Indexed: 11/28/2022]
Abstract
INTRODUCTION The adoption of robot-assisted laparoscopic (RAL) procedures in the field of urology has occurred rapidly, but is, to date, without pediatric-specific instrumentation. Surgical fog is a significant barrier to safe and efficient laparoscopy. This appears to be a significant challenge when adapting three-dimensional 8.5-mm scopes to use in pediatric RAL surgery. The objective of the present study was to compare matched controls from a prospectively collected database to procedures that were performed utilizing special equipment and a protocol to minimize surgical fog in pediatric RAL procedures. METHODS A prospectively collected database of all patients who underwent RAL pediatric urology procedures was used to compare: procedure, age, sex, American Society of Anesthesiologists score, weight, console time, number of times the camera was removed to clean the lens during a procedure, length of hospital stay, and morphine equivalents required in the postoperative period. A uniquely developed protocol was used, it consisted of humidified (95% relative humidity) and warmed CO2 gas (95 °F) insufflation via Insuflow® on a working trocar, with active smoke evacuation via PneuVIEW®XE on the opposite working trocar with a gas pass through of 3.5-5 l/min. The outcomes were compared with matched controls (Summary Fig). RESULTS The novel gas protocol was utilized in 13 procedures (five pyeloplasties, two revision pyeloplasties, three ureteroureterostomies (UU), three nephrectomies) and compared with 13 procedures (six pyeloplasties, one revision pyeloplasty, three UU, three nephrectomies) prior to the protocol development. There was no statistical difference in age (P = 0.78), sex (P = 0.11), ASA score (P = 1.00) or weight (P = 0.69). There were no open conversions, ≥Grade 2 Clavien complications, or readmissions within 30 days in either group. CONCLUSIONS This novel gas protocol yielded a statistically significant reduction in procedure time, by decreasing the number of times the camera was required to be pulled during the case by more than five occurrences, and saved approximately 35 min on average per case.
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Affiliation(s)
- B Meenakshi-Sundaram
- Department of Urology, Children's Hospital at OU Medical Center, Oklahoma City, OK, USA.
| | - J R Furr
- Department of Urology, Children's Hospital at OU Medical Center, Oklahoma City, OK, USA
| | - E Malm-Buatsi
- Department of Urology, Children's Hospital at OU Medical Center, Oklahoma City, OK, USA
| | - B Boklage
- Product Development, Lexion Medical, St. Paul, MN, USA
| | - E Nguyen
- Department of Urology, Children's Hospital at OU Medical Center, Oklahoma City, OK, USA
| | - D Frimberger
- Department of Urology, Children's Hospital at OU Medical Center, Oklahoma City, OK, USA
| | - B W Palmer
- Department of Urology, Children's Hospital at OU Medical Center, Oklahoma City, OK, USA
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Nguyen E, Sobieraj DM. The impact of appointment-based medication synchronization on medication taking behaviour and health outcomes: A systematic review. J Clin Pharm Ther 2017; 42:404-413. [PMID: 28485006 DOI: 10.1111/jcpt.12554] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Accepted: 04/10/2017] [Indexed: 11/30/2022]
Abstract
WHAT IS KNOWN AND OBJECTIVE Proactive synchronization of medication refills through an appointment-based model (ABM) is a community pharmacy-based intervention targeting adherence to medications. We aimed to systematically review evidence on the impact of the ABM on medication taking behaviour, health resource utilization, clinical outcomes and the preferences of patients and providers. METHODS We conducted a systematic literature search of MEDLINE and Scopus from database inception through 6 February 2017. Studies were included if they were original investigations evaluating the impact of the ABM on at least one outcome of interest and published in the peer-reviewed literature as a full-text manuscript in the English language. Outcomes included medication taking behaviour, clinical and economic outcomes, health resource utilization, and patient or provider satisfaction. Data were synthesized qualitatively. RESULTS Five studies, mostly observational in design and with low risk of bias, were included. Objective measures of medication taking behaviour were consistently improved in patients enrolled in an ABM vs control, indicating an association between appointment-based medication synchronization with improved adherence and decreased likelihood of non-persistence. A single decision analysis indicates a cost savings over 1 year associated with the appointment-based medication synchronization programme modelled, for hypertension, diabetes and hyperlipidaemia. Limited data regarding health resource utilization and clinical outcomes and patient or provider satisfaction exist and are currently inconclusive. WHAT IS NEW AND CONCLUSION The ABM provides a unique, patient-centred service to improve medication adherence amongst patients taking chronic medications while demonstrating a positive financial return on investment. Future research is needed to determine the impact of the ABM on final health outcomes.
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Affiliation(s)
- E Nguyen
- University of Connecticut School of Pharmacy, Storrs, CT, USA
| | - D M Sobieraj
- University of Connecticut School of Pharmacy, Storrs, CT, USA
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Weedin E, Javadian P, Nguyen E, Ketch C, Bhattacharya R, Wild R, Hansen K, Quaas A. Angiogenic profiles in in-vitro fertilization/embryo transfer (IVF/ET) treatments: relationship to hypertensive complications in IVF-conceived pregnancies. Fertil Steril 2016. [DOI: 10.1016/j.fertnstert.2016.07.531] [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: 10/21/2022]
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Albert-Vartanian A, Boyd MR, Hall AL, Morgado SJ, Nguyen E, Nguyen VPH, Patel SP, Russo LJ, Shao AJ, Raffa RB. Will peripherally restricted kappa-opioid receptor agonists (pKORAs) relieve pain with less opioid adverse effects and abuse potential? J Clin Pharm Ther 2016; 41:371-82. [DOI: 10.1111/jcpt.12404] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2016] [Accepted: 04/29/2016] [Indexed: 01/27/2023]
Affiliation(s)
| | - M. R. Boyd
- School of Pharmacy; Temple University; Philadelphia PA USA
| | - A. L. Hall
- School of Pharmacy; Temple University; Philadelphia PA USA
| | - S. J. Morgado
- School of Pharmacy; Temple University; Philadelphia PA USA
| | - E. Nguyen
- School of Pharmacy; Temple University; Philadelphia PA USA
| | | | - S. P. Patel
- School of Pharmacy; Temple University; Philadelphia PA USA
| | - L. J. Russo
- School of Pharmacy; Temple University; Philadelphia PA USA
| | - A. J. Shao
- School of Pharmacy; Temple University; Philadelphia PA USA
| | - R. B. Raffa
- School of Pharmacy; Temple University; Philadelphia PA USA
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Martel A, Nguyen E, Lassale S. [Bulbar conjunctival osseous choristoma in a 9-year-old girl: Clinical and pathological findings]. J Fr Ophtalmol 2016; 39:586-7. [PMID: 27257111 DOI: 10.1016/j.jfo.2016.02.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Revised: 02/03/2016] [Accepted: 02/16/2016] [Indexed: 10/21/2022]
Affiliation(s)
- A Martel
- Service d'ophtalmologie, hôpital Lenval, CHU de Nice, 57, avenue de la Californie, 06200 Nice, France.
| | - E Nguyen
- Service d'ophtalmologie, hôpital Lenval, CHU de Nice, 57, avenue de la Californie, 06200 Nice, France
| | - S Lassale
- Service d'anatomopathologie, hôpital Pasteur 1, CHU de Nice, 06001 Nice cedex 1, France
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Hudson BM, Nguyen E, Tantillo DJ. The influence of intramolecular sulfur-lone pair interactions on small-molecule drug design and receptor binding. Org Biomol Chem 2016; 14:3975-80. [PMID: 27049933 DOI: 10.1039/c6ob00254d] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Sulfur-lone pair interactions are important conformational control elements in sulfur-containing heterocycles that abound in pharmaceuticals, natural products, agrochemicals, polymers and other important classes of organic molecules. Nonetheless, the role of intramolecular sulfur-lone pair interactions in the binding of small molecules to receptors is often overlooked. Here we analyze the magnitudes and origins of these interactions for a variety of biologically relevant small molecules using quantum chemical and automated docking calculations. In most cases examined in this study, the lowest energy conformation of the small molecule displays a sulfur-lone pair close contact. However, docking studies, both published and new, often predict that conformations without sulfur-lone pair contacts have the best binding affinity for their respective receptors. This is a serious problem. Since many of these predicted bound conformations are not actually energetically accessible, pursuing design (e.g., drug design) around these binding modes necessarily will lead, serendipity aside, to dead end designs. Our results constitute a caution that one best not neglect these interactions when predicting the binding affinities of potential ligands (drugs or not) for hosts (enzymes, receptors, DNA, RNA, synthetic hosts). Moreover, a better understanding and awareness of sulfur-lone pair interactions should facilitate the rational modulation of host-guest interactions involving sulfur-containing molecules.
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Affiliation(s)
- B M Hudson
- Department of Chemistry, University of California, Davis, CA 95618, USA.
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Nguyen E, Gastaud P. Communication artérioveineuse congénitale de type 3 : anastomoses artérioveineuses directes multiples complexes affectant de gros vaisseaux rétiniens. J Fr Ophtalmol 2016; 39:131-2. [DOI: 10.1016/j.jfo.2014.11.018] [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] [Received: 10/30/2014] [Accepted: 11/11/2014] [Indexed: 11/30/2022]
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Qiu M, Barberi A, Nguyen E, Crossley W, Grubor D. Incidence of inferior alveolar and lingual nerve injuries following third molar removal within a training institution. Int J Oral Maxillofac Surg 2015. [DOI: 10.1016/j.ijom.2015.08.286] [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]
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Nguyen E, Goodbourn PT, Holcombe AO. Prism adaptation ameliorates pseudoneglect by enhancing target processing in right hemispace. J Vis 2014. [DOI: 10.1167/14.10.533] [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: 11/24/2022] Open
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Nguyen E, Khoe W, Saygin AP. Affective Priming by Biological Motion. J Vis 2014. [DOI: 10.1167/14.10.1019] [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: 11/24/2022] Open
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Gausdal G, Wergeland A, Skavland J, Nguyen E, Pendino F, Rouhee N, McCormack E, Herfindal L, Kleppe R, Havemann U, Schwede F, Bruserud O, Gjertsen BT, Lanotte M, Ségal-Bendirdjian E, Døskeland SO. Cyclic AMP can promote APL progression and protect myeloid leukemia cells against anthracycline-induced apoptosis. Cell Death Dis 2013; 4:e516. [PMID: 23449452 PMCID: PMC3734820 DOI: 10.1038/cddis.2013.39] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We show that cyclic AMP (cAMP) elevating agents protect blasts from patients with acute promyelocytic leukemia (APL) against death induced by first-line anti-leukemic anthracyclines like daunorubicin (DNR). The cAMP effect was reproduced in NB4 APL cells, and shown to depend on activation of the generally cytoplasmic cAMP-kinase type I (PKA-I) rather than the perinuclear PKA-II. The protection of both NB4 cells and APL blasts was associated with (inactivating) phosphorylation of PKA site Ser118 of pro-apoptotic Bad and (activating) phosphorylation of PKA site Ser133 of the AML oncogene CREB. Either event would be expected to protect broadly against cell death, and we found cAMP elevation to protect also against 2-deoxyglucose, rotenone, proteasome inhibitor and a BH3-only mimetic. The in vitro findings were mirrored by the findings in NSG mice with orthotopic NB4 cell leukemia. The mice showed more rapid disease progression when given cAMP-increasing agents (prostaglandin E2 analog and theophylline), both with and without DNR chemotherapy. The all-trans retinoic acid (ATRA)-induced terminal APL cell differentiation is a cornerstone in current APL treatment and is enhanced by cAMP. We show also that ATRA-resistant APL cells, believed to be responsible for treatment failure with current ATRA-based treatment protocols, were protected by cAMP against death. This suggests that the beneficial pro-differentiating and non-beneficial pro-survival APL cell effects of cAMP should be weighed against each other. The results suggest also general awareness toward drugs that can affect bone marrow cAMP levels in leukemia patients.
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Affiliation(s)
- G Gausdal
- Department of Biomedicine, University of Bergen, Bergen, Norway
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Petitjean-Lecherbonnier J, Dina J, Nguyen E, Gouarin S, Lebigot E, Vabret A. [Molecular diagnosis of respiratory enterovirus infections: Use of PCR and molecular identification for a best approach of the main circulating strains during 2008]. Pathol Biol (Paris) 2011; 59:113-21. [PMID: 20828940 PMCID: PMC7126958 DOI: 10.1016/j.patbio.2010.07.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2010] [Accepted: 07/29/2010] [Indexed: 11/26/2022]
Abstract
UNLABELLED The PCR assays are currently used in diagnosis of enterovirus (EV) meningitis. Nevertheless, the use of molecular diagnosis of EV should be investigated in respiratory tract infections (RTI). OBJECTIVES To perform enterovirus molecular diagnostic tools, PCR and genotyping, in nasal samples for diagnostic and epidemiologic purposes. METHODS During 2008, 3612 nasal specimen (NS) were studied by IFD and MRC5 culture. Next, we realised successively viral isolation on HuH7 culture (for NS negative by IFD assay) and a duplex PCR enterovirus-rhinovirus for the 816 HuH7 positive supernatants. Furthermore, 327 NS collected from neonates were systematically tested by a real-time RT-PCR. This assay was used in routine for EV diagnosis setting in cerebrospinal fluid. Enterovirus genotyping was then performed for the 68 positive supernatants. RESULTS Thirty-five NS (0.97%) were positive for EV by culture (MRC5). A combination of both PCR assays, PEVRV and PEV, allowed an additional identification of 41 EV, eight EV-RV and 12 RV, increasing the number of positive to 96 NS (2.6%). Among the neonates, 32 NS (11.3%) were positive for EV by PEV. Of the 98 NS tested by the two PCR assays (PEV and PEVRV), 27 were positive and we detected 10 EV, five EV-RV and 12 RV. From January to December 2008, the circulation of EV showed the usual peak in June-July when a small outbreak of aseptic meningitis occurred and an additional autumnal peak corresponding to respiratory tract infections. Five main serotypes were isolated: 19 EV68 (29.7%), 12 CB3 (18.7%), nine E3 (14,1%), six CA9 (9.4%) and six CB1 (9.4%); the 19 EV68 were isolated in October-November and 17/19 (89.5%) of positive patients were hospitalised for severe respiratory diseases. CONCLUSION The use of molecular screening techniques (PCR assays and genotyping) on nasal samples collected from patients with respiratory infections allowed a prospective, effective and precise identification of circulating strains.
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Affiliation(s)
- J Petitjean-Lecherbonnier
- Laboratoire de virologie humaine et moléculaire, CHU de Caen, avenue Georges-Clémenceau, 14033 Caen, France.
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Vabret A, Dina J, Cuvillon-Nimal D, Nguyen E, Gouarin S, Petitjean J, Brouard J, Freymuth F. [Seasonal flu]. ACTA ACUST UNITED AC 2010; 58:e51-7. [PMID: 20303676 PMCID: PMC7126553 DOI: 10.1016/j.patbio.2010.01.009] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2010] [Accepted: 01/26/2010] [Indexed: 11/25/2022]
Abstract
La grippe saisonnière est due aux virus influenza A et B. Il s’agit de virus enveloppés dont le génome est constitué de sept à huit fragments d’ARN. Les différents sous-types sont déterminés par la nature des deux glycoprotéines de surface HA et NA. La grippe saisonnière est une maladie épidémique et hivernale dans les zones à climat tempéré. Son épidémiologie est liée à la grande variabilité du virus au cours du temps, nécessitant la mise en place d’un système d’alerte détectant chaque année les variants circulants dominant et déterminant la composition vaccinale. Les symptômes cliniques de la grippe ne sont pas suffisamment spécifiques pour permettre le diagnostic sans examen virologique. Cela est particulièrement vrai en période non épidémique, chez les sujets de plus de 65 ans et chez les enfants de moins de cinq ans. L’enfant représente une cible privilégiée des infections à virus influenza. Le recours à l’hospitalisation est d’autant plus élevé que l’enfant est jeune. Chez le nourrisson, l’infection peut être paucisymptomatique et s’accompagner de manifestations non respiratoires (léthargie, convulsions, malaises). Le diagnostic virologique de la grippe est justifié chez tous les sujets hospitalisés pour un syndrome respiratoire compatible avec une infection à virus influenza. Il existe plusieurs outils permettant une recherche directe du virus dans les sécrétions respiratoires : isolement du virus en culture, détection d’antigènes, détection moléculaire de l’ARN. Le choix de la méthode se fait selon les caractéristiques du test : sensibilité, spécificité, rapidité et simplicité de réalisation, coût.
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Affiliation(s)
- A Vabret
- Laboratoire de virologie, CHU de Caen, avenue Georges-Clémenceau, 14033 Caen, France.
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Gharib SA, Nguyen E, Altemeier WA, Shaffer SA, Doneanu CE, Goodlett DR, Schnapp LM. Of mice and men: comparative proteomics of bronchoalveolar fluid. Eur Respir J 2009; 35:1388-95. [PMID: 20032019 DOI: 10.1183/09031936.00089409] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
We hypothesised that comparing the protein mixture in bronchoalveolar lavage fluid (BALF) between humans and mice may lead to mechanistic insights into common and divergent pathways that evolved in each species. BALF from four humans and six mice was pooled separately and underwent identical shotgun proteomic analysis. Functional and network analysis was applied to identify overlapping and distinct pathways enriched in the BALF. Follow-up experiments using Western analysis in unpooled BALF samples were performed. We identified 91 unique proteins in human and 117 unique proteins in mouse BALF samples. Functional analysis of the proteins revealed conservation of several key processes between the species, including defence response. Oxidative stress response, however, was selectively enriched only in mouse BALF. Differences in the expression of peroxiredoxin-1, a key member of the defence pathway against oxidative injury, were confirmed between normal human and mouse BALF and in models of lung injury. A computational proteomics approach of mouse and human BALF confirms the conservation of immune and defence-mediated pathways while highlighting differences in response to oxidative stress. These observations suggest that the use of mice models to study human lung disorders should be undertaken with an appreciation of interspecies variability.
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Affiliation(s)
- S A Gharib
- Center for Lung Biology, Division of Pulmonary and Critical Care Medicine, Seattle, WA, USA.
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Dina J, Vabret A, Nguyen E, Gouarin S, Petitjean J, Freymuth F. P.057 Development of a duplex real-time PCR (AB rt-PCR) for the detection of two DNA respiratory viruses: AdV and HBoV. J Clin Virol 2009. [DOI: 10.1016/s1386-6532(08)70120-3] [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]
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Killackey MT, Gondolesi GE, Liu LU, Paramesh AS, Thung SN, Suriawinata A, Nguyen E, Roayaie S, Schwartz ME, Emre S, Schiano TD. Effect of ischemia-reperfusion on the incidence of acute cellular rejection and timing of histologic hepatitis C virus recurrence after liver transplantation. Transplant Proc 2008; 40:1504-10. [PMID: 18589139 DOI: 10.1016/j.transproceed.2008.03.101] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2008] [Accepted: 03/11/2008] [Indexed: 02/08/2023]
Abstract
BACKGROUND Because of a critical shortage of deceased donor (DD) livers, more extended criteria allografts are being utilized; these allografts are at increased risk for ischemia-reperfusion injury (IRI). We assessed whether, in a large cohort of patients transplanted for hepatitis C virus (HCV) either via a DD or live donor (LD), there was a relationship between the degree of IRI and the frequency and timing of acute cellular rejection (ACR) and histologic HCV recurrence. METHODS During an 8-year study, patients were separated into four groups based on peak alanine aminotransferase (ALT) levels and three groups based on severity of IRI on postreperfusion liver biopsy. RESULTS The mean follow-up time of 433 DD and 44 LD recipients was 1212 days. We noted a strong correlation in DD between peak ALT and the histologic degree of IRI (P = .01). There was no difference in the incidence or grade of ACR among the four groups. There was no correlation between the severity of IRI and the incidence or time to histologic recurrence of HCV. CONCLUSIONS The magnitude of peak ALT correlated with the severity of IRI on postreperfusion liver biopsy. Among this large HCV cohort, there was no correlation between the severity of IRI and the incidence or timing of histologic HCV recurrence or incidence of ACR.
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Affiliation(s)
- M T Killackey
- Recanati/Miller Transplantation Institute, The Mount Sinai Medical Center, New York, USA
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Lee C, Martin J, MacRae R, Tsao M, Nguyen E, Johnston M, Baas P, Laurie S, Feld R, Murray N, Shepherd F. Malignant Mesothelioma: Canadian Perspective and Research Directions. Curr Oncol 2008. [DOI: 10.3747/co.v15i2.251] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Since the 1960s, the incidence of malignant mesothelioma in Canada has increased dramatically because of work-related asbestos exposures. Treatment options are limited. Although chemotherapy is now an accepted standard in the management of advanced disease, uncertainty surrounds the roles of radical surgery and radiation. In March 2007, a symposium was held in Vancouver, B.C., to review the current approach to malignant mesothelioma in Canada and to discuss development of a national clinical research strategy.
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Ta CN, He L, Nguyen E, De Kaspar HM. Prospective randomized study determining whether a 3-day application of ofloxacin results in the selection of fluoroquinolone-resistant coagulase-negative Staphylococcus. Eur J Ophthalmol 2006; 16:359-64. [PMID: 16761235] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
PURPOSE To determine whether a 3-day application of ofloxacin results in the selection of fluoroquinolone-resistant conjunctival coagulase-negative Staphylococcus. DESIGN Prospective randomized trial. METHODS Patients scheduled for ocular surgery were randomized to a control (89 eyes) or study group (70 eyes). The study group received topical ofloxacin (0.3%) four times a day for 3 days. Conjunctival cultures were obtained at baseline (T0) and after 3 days of ofloxacin (T1). Cultures were also obtained at T0 and T1 for the control group, but these eyes did not receive an antibiotic. Bacteria isolated were identified and antibiotic susceptibility was determined. RESULTS At T0, 53 out of 89 patients (60%) in the control and 48 out of 70 patients (69%) in the study group harbored coagulase-negative Staphylococcus. Among these coagulase-negative Staphylococcus, 12 out of 53 in the control and 11 out of 48 in the study group were resistant to ofloxacin (p>0.9999). At T1, significantly fewer coagulase-negative Staphylococcus (p=0.0003) were isolated from the study group (18 coagulase-negative Staphylococcus), compared the control group (48 coagulase-negative Staphylococcus). Of these, 5 out of 17 coagulase-negative Staphylococcus in the study group and 9 out of 48 coagulase-negative Staphylococcus in the control group were resistant to ofloxacin (p=0.5649). There was no significant difference in the number of coagulase-negative Staphylococcus resistant to ciprofloxacin or norfloxacin in the study group compared to the control group at T1. CONCLUSIONS Ofloxacin given four times a day for 3 days does not select out for conjunctival fluoroquinolone-resistant coagulase-negative Staphylococcus.
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Affiliation(s)
- C N Ta
- Department of Ophthalmology, School of Medicine, Stanford University, Stanford, CA 94304, USA
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Rahman P, Nguyen E, Cheung C, Schentag CT, Gladman DD. Comparison of radiological severity in psoriatic arthritis and rheumatoid arthritis. J Rheumatol 2001; 28:1041-4. [PMID: 11361186] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
OBJECTIVE To compare the radiological severity of patients with psoriatic arthritis (PsA) and rheumatoid arthritis (RA). METHODS Patients were identified from the University of Toronto PsA and RA databases. Using the earliest available radiographs, each RA patient was matched to a single PsA patient on the basis of sex, age, and disease duration. Two rheumatologists blinded to the patient's diagnosis scored the radiographs using the modified Steinbrocker method. RESULTS PsA and RA groups were similar with respect to demographics as well as the use of disease modifying antirheumatic medications. No significant difference in Steinbrocker score for the hands and feet or the hands only was noted. Patients with RA had a higher radiological score in the feet. The 2 groups were similar in the number of joints with significant radiological damage (Steinbrocker 3 and 4). CONCLUSION; Overall the radiological severity in the hands and feet of patients with PsA was comparable to that of patients with RA.
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Affiliation(s)
- P Rahman
- University of Toronto Psoriatic Arthritis Clinic, University of Toronto, Toronto Western Hospital, Ontario, Canada
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Rizzo MT, Nguyen E, Aldo-Benson M, Lambeau G. Secreted phospholipase A(2) induces vascular endothelial cell migration. Blood 2000; 96:3809-15. [PMID: 11090064] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023] Open
Abstract
Secreted phospholipase A(2) (sPLA(2)) regulates a variety of cellular functions. The present investigation was undertaken to elucidate the potential role of sPLA(2) in endothelial cell (EC) migration. Bovine aortic endothelial cells (BAECs) exposed to sPLA(2) placed in the lower compartment of a modified Boyden chamber displayed increased migration compared to cells exposed to vehicle. The effect of sPLA(2) on EC migration was time and dose dependent. Migration of BAECs was observed at 30 minutes, increased over 1 to 2 hours, and declined thereafter. At 2 hours of stimulation, sPLA(2) (0.01-2 micromol/L) induced 1.2- to 3-fold increased cell migration compared with media alone. Among the different sPLA(2)s tested, bee venom, Naja naja, and porcine and human pancreatic PLA(2)s all evoked a migratory response in ECs. Moreover, human synovial fluid, obtained from patients with arthritis and containing sPLA(2) activity, induced EC migration. Migration of ECs was significantly reduced after exposure to a catalytic site mutant of pancreatic sPLA(2) with decreased lipolytic activity as compared to wild-type sPLA(2). Similarly, pretreatment of human synovial fluid with p-bromophenacyl bromide, an irreversible inhibitor of sPLA(2), markedly decreased the ability of human synovial fluid to stimulate EC migration. Moreover, migration of ECs was stimulated on exposure to hydrolytic products of sPLA(2) activity including arachidonic acid, lysophosphatidic acid, and lysophosphatidylcholine. These findings suggest that sPLA(2) plays a physiologic role in induction of EC migration. Moreover, the effects of sPLA(2) on EC migration are mediated, at least in part, by its catalytic activity. (Blood. 2000;96:3809-3815)
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Affiliation(s)
- M T Rizzo
- Signal Transduction Laboratory, Methodist Research Institute and Arthritis Care Center, Clarian Health, Indianapolis, IN 46201, USA.
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Abstract
Previous biochemical and morphological studies have shown the presence of actin in the nucleus of different cell types where its role remains unclear. In this work, through fluorescence microscopy we studied the localization of actin in the nuclei of early mouse embryos with particular attention to its possible involvement in the onset of transcription occurring at the late one-cell stage. Fluorescent labelling of embryo sections showed that nuclear actin in abundant, in a non-filamentous state, in the whole nucleoplasm excluding the nucleolar precursor bodies. Immunofluorescence on permeabilized embryos revealed that insoluble nuclear actin accumulates in a few large aggregates in transcriptionally inert early one-cell embryos and progressively redistributes into many small aggregates in transcriptionally active late one-cell embryos. Interestingly, these actin aggregates clearly colocalize with transcription sites. Treatment of late one-cell embryos with cytochalasin D induces the formation of actin bundles network in the nucleoplasm but has no apparent effect on the transcriptional activity. In addition, the inhibition of transcription by alpha-amanitin does not modify the nuclear actin distribution. Hence, there does not appear to be a direct causal relationship between transcriptional activity and nuclear actin organization at the one-cell stage although nuclear actin aggregates appear associated with transcription sites.
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Affiliation(s)
- E Nguyen
- Laboratoire Associé INSERM (Unité 310), INRA (Station 806) Institut de Biologie Physico-Chimique, Paris, France.
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Bouniol-Baly C, Nguyen E, Besombes D, Debey P. Dynamic organization of DNA replication in one-cell mouse embryos: relationship to transcriptional activation. Exp Cell Res 1997; 236:201-11. [PMID: 9344600 DOI: 10.1006/excr.1997.3708] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
We have analyzed the spatial and temporal relationship between transcription and replication sites during the first cell cycle in mouse embryos. Embryos were microinjected with both 5-bromouridine-5'-triphosphate and digoxygenin-11-deoxyuridine-5'-triphosphate to visualize transcription and replication sites respectively. We detected six different phases of replication during S phase and dated the onset of zygotic transcription at the end of the S phase. Using confocal microscopy, we showed that there is essentially no colocalization of replication and transcription sites at this stage of development. Moreover, studies on aphidicolin-treated embryos demonstrated that inhibition of DNA replication does not hinder transcriptional activation at the 1-cell stage.
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Affiliation(s)
- C Bouniol-Baly
- Laboratoire Associé Institut National de la Santé et de la Recherche Médicale (INSERM), Institut National de la Recherche Agronomique (INRA), Paris, France. bouniol@.ibpc.fr
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Abstract
In most animal species, the earliest stages of embryogenesis are regulated by maternally inherited components, at least until the activation of the zygotic genome. Although the first proteins derived from the activation of the embryonic genome have been detected long ago at the 2-cell stage in the mouse, the exact timing of transcriptional activity resumption after fertilization is still a matter of debate. Any new information about this critical event is relevant to the practice of transgenesis and cloning of embryos as well as to the general understanding of the regulation of nuclear processes following fertilization. Using a new fluorescent method allowing the detection of in vivo RNA synthesis, we show that endogenous transcription by RNA polymerase II takes place unambiguously as early as at the late 1-cell stage. Furthermore, we demonstrate that transcription is first initiated in the paternal pronucleus.
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Affiliation(s)
- C Bouniol
- Laboratoire Associé Institut National de la Santé et de la Recherche Médicale (INSERM) Unité 310, Institut National de la Recherche Agronomique (INRA) Station 806, Paris, France
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Abstract
Mice challenged with the anxiolytic benzodiazepine chlordiazepoxide exhibited significant increases in the percent of total entries into and percent of total time spent on open arms of an elevated plus maze. Systemic pretreatment with the nitric oxide synthase-inhibitor L-NG-nitro arginine (L-NOARG) antagonized these effects of chlordiazepoxide. This inhibitory effect of L-NOARG was stereospecifically and completely reversed by intracerebroventricular administration of L-arginine but not D-arginine. These findings suggest a possible role of nitric oxide in the anxiolytic effect of chlordiazepoxide in the elevated plus maze.
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Affiliation(s)
- R M Quock
- Department of Biomedical Sciences, University of Illinois College of Medicine, Rockford 61107-1897
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Prulière G, Nguyen E, Vincent C, Campion E, Pajot-Augy E. Effect of organic solvents used in cryopreservation on actin-linked cytoskeleton. Cryobiology 1988. [DOI: 10.1016/0011-2240(88)90379-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Regnouf F, Nguyen E, Cassoly R, Pradel LA. Pig thyroid spectrin. A membrane-associated protein related in structure and function to brain spectrin. Eur J Biochem 1985; 153:313-9. [PMID: 4076179 DOI: 10.1111/j.1432-1033.1985.tb09303.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Thyroid spectrin has been obtained pure from pig thyroid glands. This protein, composed of two non-identical polypeptide chains of 240 kDa and 235 kDa, appears to possess the same structural and immunological properties as well as the same calmodulin and actin-binding properties as brain spectrin. Through cross-linking of actin filaments it is a potent gelation factor for F-actin solutions. It represents one of the major protein of the cytoskeleton underlying the thyroid plasma membrane together with myosin, alpha-actinin and actin.
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