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Bengtsson B, Villalba C, Peters D, Aspberg J. Comparison of disease severity in glaucoma patients identified by screening in the 1990s and in routine clinical care in the 2010s in Sweden. Acta Ophthalmol 2024; 102:238-245. [PMID: 37786298 DOI: 10.1111/aos.15777] [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: 11/25/2022] [Revised: 09/08/2023] [Accepted: 09/18/2023] [Indexed: 10/04/2023]
Abstract
BACKGROUND AND PURPOSE In a previous study comparing the amount of visual field damage at presentation in patients having open-angle glaucoma (OAG) identified through screening and in patients diagnosed in routine clinical practice in the 1990s, the damage was considerably worse in the clinically diagnosed patients. In the present study we compare visual field damage at presentation in the same 402 screened patients with that seen in 281 newly detected previously untreated patients clinically diagnosed in the 2010s. METHODS The perimetric visual field index mean deviation (MD) was compared in the two groups of patients. RESULTS In the clinical patients diagnosed with bilateral visual field damage the median MD was -5.1 dB in the better eye and -13.0 dB in the worse eye. In the screened patients the median MD in the better eye was -6.5 dB and -11.5 dB in the worse eye. The differences between the clinical and screened patients were non-significant, p = 0.28 and p = 0.67 respectively. More clinical patients had severe visual field loss, defined as MD less than -20 dB, in the worse eye than in the screened patients, 18.5% versus 12.7% respectively, p = 0.037. CONCLUSION The visual field damage at presentation in clinically diagnosed OAG patients has improved in the past 20 years, but the proportion of patients with severe visual field loss in at least one eye, almost 20%, is still unacceptably high considering that severe visual field damage at presentation is the most important risk factor for later development of glaucoma blindness.
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Affiliation(s)
- B Bengtsson
- Department of Clinical Sciences, Ophthalmology in Malmö, Lund University, Lund, Sweden
| | - C Villalba
- Department of Clinical Sciences, Ophthalmology in Malmö, Lund University, Lund, Sweden
| | - D Peters
- Department of Clinical Sciences, Ophthalmology in Malmö, Lund University, Lund, Sweden
- Department of Ophthalmology, Skåne University Hospital, Lund, Sweden
| | - J Aspberg
- Department of Clinical Sciences, Ophthalmology in Malmö, Lund University, Lund, Sweden
- Department of Ophthalmology, Skåne University Hospital, Lund, Sweden
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Christodoulou AG, Cruz G, Arami A, Weingärtner S, Artico J, Peters D, Seiberlich N. The future of cardiovascular magnetic resonance: All-in-one vs. real-time (Part 1). J Cardiovasc Magn Reson 2024; 26:100997. [PMID: 38237900 DOI: 10.1016/j.jocmr.2024.100997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 01/10/2024] [Indexed: 02/26/2024] Open
Abstract
Cardiovascular magnetic resonance (CMR) protocols can be lengthy and complex, which has driven the research community to develop new technologies to make these protocols more efficient and patient-friendly. Two different approaches to improving CMR have been proposed, specifically "all-in-one" CMR, where several contrasts and/or motion states are acquired simultaneously, and "real-time" CMR, in which the examination is accelerated to avoid the need for breathholding and/or cardiac gating. The goal of this two-part manuscript is to describe these two different types of emerging rapid CMR. To this end, the vision of each is described, along with techniques which have been devised and tested along the pathway of clinical implementation. The pros and cons of the different methods are presented, and the remaining open needs of each are detailed. Part 1 will tackle the "all-in-one" approaches, and Part 2 the "real-time" approaches along with an overall summary of these emerging methods.
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Affiliation(s)
- Anthony G Christodoulou
- Department of Radiological Sciences, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, CA, USA; Biomedical Imaging Research Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Gastao Cruz
- Michigan Institute for Imaging Technology and Translation, Department of Radiology, University of Michigan, Ann Arbor, MI, USA
| | - Ayda Arami
- Department of Imaging Physics, Delft University of Technology, Delft, the Netherlands; Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands
| | - Sebastian Weingärtner
- Department of Imaging Physics, Delft University of Technology, Delft, the Netherlands
| | | | - Dana Peters
- Radiology & Biomedical Imaging, Yale University, New Haven, CT, USA
| | - Nicole Seiberlich
- Michigan Institute for Imaging Technology and Translation, Department of Radiology, University of Michigan, Ann Arbor, MI, USA.
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Dallmann J, Freitag J, Jung C, Khinvasara K, Merz L, Peters D, Schork M, Beck J. CIMT 2023: report on the 20th Annual Meeting of the Association for Cancer Immunotherapy. Immunooncol Technol 2023; 20:100397. [PMID: 37876518 PMCID: PMC10590812 DOI: 10.1016/j.iotech.2023.100397] [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] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 10/26/2023]
Abstract
The Association for Cancer Immunotherapy (CIMT) celebrated the 20th anniversary of the CIMT Annual Meeting. CIMT2023 was held 3-5 May 2023 in Mainz, Germany. 1051 academic and clinical professionals from over 30 countries attended the meeting and discussed the latest advances in cancer immunology and immunotherapy research. This report summarizes the highlights of CIMT2023.
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Affiliation(s)
- J. Dallmann
- Immunotherapies & Preclinical Research, BioNTech SE, Mainz
| | - J. Freitag
- TRON-Translational Oncology, University Medical Center of the Johannes Gutenberg University Mainz gGmbH, Mainz, Germany
| | - C. Jung
- BioNTech Cell & Gene Therapies GmbH, Mainz
| | - K. Khinvasara
- TRON-Translational Oncology, University Medical Center of the Johannes Gutenberg University Mainz gGmbH, Mainz, Germany
| | - L. Merz
- TRON-Translational Oncology, University Medical Center of the Johannes Gutenberg University Mainz gGmbH, Mainz, Germany
| | - D. Peters
- Immunotherapies & Preclinical Research, BioNTech SE, Mainz
| | - M. Schork
- TRON-Translational Oncology, University Medical Center of the Johannes Gutenberg University Mainz gGmbH, Mainz, Germany
| | - J.D. Beck
- Immunotherapies & Preclinical Research, BioNTech SE, Mainz
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Giammattei L, Starnoni D, Peters D, George M, Messerer M, Daniel RT. Combined petrosal approach: a systematic review and meta-analysis of surgical complications. Neurosurg Rev 2023; 46:172. [PMID: 37439884 PMCID: PMC10344984 DOI: 10.1007/s10143-023-02072-7] [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: 05/09/2023] [Revised: 05/31/2023] [Accepted: 06/20/2023] [Indexed: 07/14/2023]
Abstract
Transpetrosal approaches are known to be associated with a significant risk of complications, including CSF leak, facial palsy, hearing impairment, venous injury, and/or temporal lobe injury. We aimed to evaluate the morbidity of the standard combined petrosal approach (CPA), defined as a combination of the posterior (retrolabyrinthine) and the anterior petrosal approach. We performed a systematic review and meta-analysis of articles reporting on clinical series of patients operated on for petroclival meningiomas through CPA. Studies that used the terminology "combined petrosal approach" without matching the aforementioned definition were excluded as well as clinical series that included less than 5 patients. A total of 8 studies were included involving 160 patients. The pooled complication rates were 3% (95% CI, 0.5-5.6) for CSF leak, 8.6% (95% CI, 4.1-13.2%) for facial palsy, 8.2% (95% CI, 3.9-12.6%) for hearing impairment, 2.8% (95% CI, 0.9-6.5%) for venous complications, and finally 4.8% (95%, 1.2-8.4%) for temporal lobe injury. Contrary to the general belief, CPA is associated with an acceptable rate of complications, especially when compared to alternative approaches to the petroclival area. In view of the major advantages like shorter trajectory, multiple angles of surgical attack, and early tumor devascularization, CPA remains an important tool in the armamentarium of the skull base surgeon.
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Affiliation(s)
- L Giammattei
- Department of Neurosurgery, Lausanne University Hospital, Lausanne, Switzerland.
| | - D Starnoni
- Department of Neurosurgery, Lausanne University Hospital, Lausanne, Switzerland
- Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| | - D Peters
- Department of Neurosurgery, Lausanne University Hospital, Lausanne, Switzerland
- Carolina Neurosurgery & Spine Associates, Charlotte, NC, USA
| | - M George
- Department of Otorhinolaryngology and Head and Neck Surgery, Lausanne University Hospital, Lausanne, Switzerland
| | - M Messerer
- Department of Neurosurgery, Lausanne University Hospital, Lausanne, Switzerland
- Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
| | - R T Daniel
- Department of Neurosurgery, Lausanne University Hospital, Lausanne, Switzerland
- Faculty of Biology and Medicine, University of Lausanne, Lausanne, Switzerland
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Kwan JM, Arbune A, Henry ML, Hu R, Wei W, Nguyen V, Lee S, Lopez-Mattei J, Guha A, Huber S, Bader AS, Meadows J, Sinusas A, Mojibian H, Peters D, Lustberg M, Hull S, Baldassarre LA. Quantitative cardiovascular magnetic resonance findings and clinical risk factors predict cardiovascular outcomes in breast cancer patients. PLoS One 2023; 18:e0286364. [PMID: 37252927 PMCID: PMC10228774 DOI: 10.1371/journal.pone.0286364] [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: 11/05/2022] [Accepted: 05/15/2023] [Indexed: 06/01/2023] Open
Abstract
BACKGROUND Cardiac magnetic resonance (CMR) global longitudinal strain and circumferential strain abnormalities have been associated with left ventricular ejection fraction (LVEF) reduction and cardiotoxicity from oncologic therapy. However, few studies have evaluated the associations of strain and cardiovascular outcomes. OBJECTIVES To assess CMR circumferential and global longitudinal strain (GLS) correlations with cardiovascular outcomes including myocardial infarction, systolic dysfunction, diastolic dysfunction, arrhythmias and valvular disease in breast cancer patients treated with and without anthracyclines and/or trastuzumab therapy. METHODS Breast cancer patients with a CMR from 2013-2017 at Yale New Haven Hospital were included. Patient co-morbidities, medications, and cardiovascular outcomes were obtained from chart review. Biostatistical analyses, including Pearson correlations, competing risk regression model, and competing risk survival curves comparing the two groups were analyzed. RESULTS 116 breast cancer with CMRs were included in our analysis to assess differences between Anthracycline/Trastuzumab (AT) (62) treated versus non anthracycline/trastuzumab (NAT) (54) treated patients in terms of imaging characteristics and outcomes. More AT patients 17 (27.4%) developed systolic heart failure compared to the NAT group 6 (10.9%), p = 0.025. Statin use was associated with a significant reduction in future arrhythmias (HR 0.416; 95% CI 0.229-0.755, p = 0.004). In a sub-group of 13 patients that underwent stress CMR, we did not find evidence of microvascular dysfunction by sub-endocardial/sub-epicardial myocardial perfusion index ratio after adjusting for ischemic heart disease. CONCLUSIONS In our study, CMR detected signs of subclinical cardiotoxicity such as strain abnormalities despite normal LV function and abnormal circumferential strain was associated with adverse cardiovascular outcomes such as valvular disease and systolic heart failure. Thus, CMR is an important tool during and after cancer treatment to identity and prognosticate cancer treatment-related cardiotoxicity.
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Affiliation(s)
- Jennifer M. Kwan
- Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, United States of America
| | - Amit Arbune
- Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, United States of America
| | - Mariana L. Henry
- Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, United States of America
| | - Rose Hu
- Department of Biostatistics, New Haven CT Yale School of Public Health, New Haven, CT, United States of America
| | - Wei Wei
- Department of Biostatistics, New Haven CT Yale School of Public Health, New Haven, CT, United States of America
| | | | - Seohyuk Lee
- Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, United States of America
- Allegheny General Hospital, Pittsburg, PA, United States of America
| | | | - Avirup Guha
- Medical College of Georgia, Augusta, Georgia, United States of America
| | - Steffen Huber
- Department of Radiology, Yale School of Medicine, Section of Medical Oncology Yale School of Medicine, New Haven, CT, United States of America
| | - Anna S. Bader
- Department of Radiology, Yale School of Medicine, Section of Medical Oncology Yale School of Medicine, New Haven, CT, United States of America
| | - Judith Meadows
- Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, United States of America
| | - Albert Sinusas
- Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, United States of America
- Department of Radiology, Yale School of Medicine, Section of Medical Oncology Yale School of Medicine, New Haven, CT, United States of America
| | - Hamid Mojibian
- Department of Radiology, Yale School of Medicine, Section of Medical Oncology Yale School of Medicine, New Haven, CT, United States of America
| | - Dana Peters
- Department of Radiology, Yale School of Medicine, Section of Medical Oncology Yale School of Medicine, New Haven, CT, United States of America
| | - Maryam Lustberg
- Cardiology, Yale School of Medicine, New Haven, CT, United States of America
| | - Sarah Hull
- Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, United States of America
| | - Lauren A. Baldassarre
- Section of Cardiovascular Medicine, Yale School of Medicine, New Haven, CT, United States of America
- Department of Radiology, Yale School of Medicine, Section of Medical Oncology Yale School of Medicine, New Haven, CT, United States of America
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Blaney K, Foerster S, Baumgartner J, Benckert M, Blake J, Bray J, Chamany S, Devinney K, Fine A, Gindler M, Guerra L, Johnson A, Keeley C, Lee D, Lipsit M, McKenney S, Misra K, Perl S, Peters D, Ray M, Saad E, Thomas G, Trieu L, Udeagu CC, Watkins J, Wong M, Zielinski L, Long T, Vora NM. COVID-19 Case Investigation and Contact Tracing in New York City, June 1, 2020, to October 31, 2021. JAMA Netw Open 2022; 5:e2239661. [PMID: 36322090 PMCID: PMC9631107 DOI: 10.1001/jamanetworkopen.2022.39661] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
IMPORTANCE Contact tracing is a core strategy for preventing the spread of many infectious diseases of public health concern. Better understanding of the outcomes of contact tracing for COVID-19 as well as the operational opportunities and challenges in establishing a program for a jurisdiction as large as New York City (NYC) is important for the evaluation of this strategy. OBJECTIVE To describe the establishment, scaling, and maintenance of Trace, NYC's contact tracing program, and share data on outcomes during its first 17 months. DESIGN, SETTING, AND PARTICIPANTS This cross-sectional study included people with laboratory test-confirmed and probable COVID-19 and their contacts in NYC between June 1, 2020, and October 31, 2021. Trace launched on June 1, 2020, and had a workforce of 4147 contact tracers, with the majority of the workforce performing their jobs completely remotely. Data were analyzed in March 2022. MAIN OUTCOMES AND MEASURES Number and proportion of persons with COVID-19 and contacts on whom investigations were attempted and completed; timeliness of interviews relative to symptom onset or exposure for symptomatic cases and contacts, respectively. RESULTS Case investigations were attempted for 941 035 persons. Of those, 840 922 (89.4%) were reached and 711 353 (75.6%) completed an intake interview (women and girls, 358 775 [50.4%]; 60 178 [8.5%] Asian, 110 636 [15.6%] Black, 210 489 [28.3%] Hispanic or Latino, 157 349 [22.1%] White). Interviews were attempted for 1 218 650 contacts. Of those, 904 927 (74.3%) were reached, and 590 333 (48.4%) completed intake (women and girls, 219 261 [37.2%]; 47 403 [8.0%] Asian, 98 916 [16.8%] Black, 177 600 [30.1%] Hispanic or Latino, 116 559 [19.7%] White). Completion rates were consistent over time and resistant to changes related to vaccination as well as isolation and quarantine guidance. Among symptomatic cases, median time from symptom onset to intake completion was 4.7 days; a median 1.4 contacts were identified per case. Median time from contacts' last date of exposure to intake completion was 2.3 days. Among contacts, 30.1% were tested within 14 days of notification. Among cases, 27.8% were known to Trace as contacts. The overall expense for Trace from May 6, 2020, through October 31, 2021, was approximately $600 million. CONCLUSIONS AND RELEVANCE Despite the complexity of developing a contact tracing program in a diverse city with a population of over 8 million people, in this case study we were able to identify 1.4 contacts per case and offer resources to safely isolate and quarantine to over 1 million cases and contacts in this study period.
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Affiliation(s)
- Kathleen Blaney
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Steffen Foerster
- New York City Department of Health and Mental Hygiene, Queens, New York
| | | | | | - Janice Blake
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Jackie Bray
- New York City Health + Hospitals, New York, New York
- Now with New York State Division of Homeland Security and Emergency Services, Albany, New York
| | - Shadi Chamany
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Katelynn Devinney
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Annie Fine
- New York City Department of Health and Mental Hygiene, Queens, New York
- Now with Council of State and Territorial Epidemiologists, Atlanta, Georgia
| | - Masha Gindler
- New York City Health + Hospitals, New York, New York
| | - Laura Guerra
- New York City Health + Hospitals, New York, New York
| | | | - Chris Keeley
- New York City Health + Hospitals, New York, New York
| | - David Lee
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Mia Lipsit
- New York City Health + Hospitals, New York, New York
| | - Sarah McKenney
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Kavita Misra
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Sarah Perl
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Dana Peters
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Madhury Ray
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Eduardo Saad
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Guajira Thomas
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Lisa Trieu
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Chi-Chi Udeagu
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Julian Watkins
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Marcia Wong
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Lindsay Zielinski
- New York City Department of Health and Mental Hygiene, Queens, New York
| | - Theodore Long
- New York City Health + Hospitals, New York, New York
| | - Neil M. Vora
- New York City Department of Health and Mental Hygiene, Queens, New York
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Williams AM, Jamison K, Eppink ST, Pathela P, Blank S, Peters D, Gift TL, Berruti AA. The Cost of Operating Sexual Health Clinics During the Ending the (HIV) Epidemic Initiative in New York City. Sex Transm Dis 2022; 49:771-777. [PMID: 35948304 PMCID: PMC9561010 DOI: 10.1097/olq.0000000000001691] [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] [Indexed: 11/27/2022]
Abstract
BACKGROUND As part of New York State's Ending the Epidemic (EtE) initiative, sexual health clinics (SHCs) in New York City invested in clinic enhancements and expanded their HIV-related services to increase access to HIV prevention interventions and treatment. The objective of this study was to estimate and describe the change in SHC operating costs related to clinic enhancements and expanded patient services implemented as part of the EtE initiative. METHODS A comprehensive microcosting approach was used to collect retrospective cost information from SHCs, broken down by category and programmatic activity. Cost information was collected from 8 clinics across New York City during two 6-month time periods before (2015) and during (2018-2019) EtE. RESULTS Eight SHCs reported comprehensive cost data. Costs increased by $800,000 on average per clinic during the 6-month EtE period. The cost per visit at an SHC increased by $120 on average to $381 (ranging from $302 to $464) during the EtE period. Personnel costs accounted for 69.9% of EtE costs, and HIV-related medications accounted for 8.9% of costs. Employment of social workers and patient navigators increased costs by approximately $150,000 on average per clinic. Postexposure prophylaxis was the costliest medication with average expenditures of $103,800 per clinic. CONCLUSIONS This study demonstrates the key drivers of cost increases when offering enhanced HIV services in SHCs. Documenting the changes in resources necessary to implement these services and their costs can inform other health departments on the viability of offering enhanced HIV services within their own clinics.
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Affiliation(s)
- Austin M Williams
- From the Division of Sexually Transmitted Disease Prevention, US Centers for Disease Control and Prevention, Atlanta, GA
| | - Kelly Jamison
- New York City Department of Health and Mental Hygiene, New York, NY
| | - Samuel T Eppink
- From the Division of Sexually Transmitted Disease Prevention, US Centers for Disease Control and Prevention, Atlanta, GA
| | - Preeti Pathela
- New York City Department of Health and Mental Hygiene, New York, NY
| | | | - Dana Peters
- New York City Department of Health and Mental Hygiene, New York, NY
| | - Thomas L Gift
- From the Division of Sexually Transmitted Disease Prevention, US Centers for Disease Control and Prevention, Atlanta, GA
| | - Andrés A Berruti
- From the Division of Sexually Transmitted Disease Prevention, US Centers for Disease Control and Prevention, Atlanta, GA
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Patterson Rosa L, Whitaker B, Allen K, Peters D, Buchanan B, McClure S, Honnas C, Buchanan C, Martin K, Lundquist E, Vierra M, Foster G, Brooks SA, Lafayette C. Genomic loci associated with performance limiting equine overriding spinous processes (kissing spines). Res Vet Sci 2022; 150:65-71. [PMID: 35803009 DOI: 10.1016/j.rvsc.2022.06.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 05/26/2022] [Accepted: 06/27/2022] [Indexed: 11/25/2022]
Abstract
Commonly known as "Kissing Spines" (KS), the pathological mechanisms underlying impingement and overriding of spinous processes (ORSPs) in horses are poorly understood. Thoroughbreds, Warmbloods, and stock-type breeds, including Paint Horses and Quarter Horses are at increased risk for developing clinical signs of KS. A total of 155 stock-type and Warmblood horses presented at collaborating veterinary clinics and hospitals were examined using a strict clinical and radiographical phenotyping scheme to grade each horse from 0 for unaffected controls to 4 for severe KS. Following genotyping with the Illumina Equine SNP70 array (Illumina, Inc.) a Genome Wide Association Study (GWAS) using 61,229 filtered individual Single Nucleotide Polymorphisms (SNPs) was performed to the KS grade phenotype. Two significantly associated SNPs (BIEC2-668062 and BIEC2-668013) on chromosome 25 defined a ~1.4 Gb candidate region containing approximately 17 coding genes (EquCab3) and 195 ENSEMBL annotated variants. Investigation of the best associated SNP (BIEC2-668062) on chr25 demonstrates a significant correlation with an increase in one KS grade, on average, per A allele in this population. A significant effect of breed group, age, height or sex was not observed in this population. These preliminary results demonstrate the potential for KS diagnosis and preventative measures for WB/ST individuals supported by increased genetic risk for more severe KS grade. We propose further research including other affected breeds and evaluating causative variants, as well as the effect of BIEC2-668062 in these populations.
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Affiliation(s)
| | - B Whitaker
- Brazos Valley Equine Hospitals, Salado, TX 76571, USA
| | - K Allen
- Virginia Equine Imaging Center, The Plains, VA 20198, USA
| | - D Peters
- East-West Equine Sports, Lexington, KY 40583, USA
| | - B Buchanan
- Brazos Valley Equine Hospitals, Salado, TX 76571, USA
| | - S McClure
- Midwest Equine, Boone, IA 50036, USA
| | - C Honnas
- Texas Equine Hospital, Bryan, TX 77807, USA
| | - C Buchanan
- Brazos Valley Equine Hospitals, Salado, TX 76571, USA
| | - K Martin
- Etalon, Inc, Menlo Park, CA 94025, USA
| | | | - M Vierra
- Etalon, Inc, Menlo Park, CA 94025, USA
| | - G Foster
- Etalon, Inc, Menlo Park, CA 94025, USA
| | - S A Brooks
- Department of Animal Science, UF Genetics Institute, University of Florida, Gainesville, FL 32610, USA
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9
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Hu C, Huber S, Nguyen V, Baldassarre L, Mojibian H, Peters D. Fat-saturated dark-blood cardiac T2 mapping in a single breath-hold. Magn Reson Imaging 2021; 81:24-32. [PMID: 34044065 DOI: 10.1016/j.mri.2021.05.004] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2020] [Revised: 05/06/2021] [Accepted: 05/23/2021] [Indexed: 12/18/2022]
Abstract
PURPOSE Conventional cardiac T2 mapping suffers from the partial-voluming effect in the endocardium and epicardium due to the co-presence of intra-cavity blood and epicardial fat. The aim of the study is to develop a novel single-breath-hold Fat-Saturated Dark-Blood (FSDB) cardiac T2-mapping technique to mitigate the partial-voluming and improve T2 accuracy. METHODS The proposed FSDB T2-mapping technique combines T2-prepared bSSFP, a novel use of double inversion-recovery with heart-rate-adaptive TI, and spectrally-selective fat saturation to mitigate partial-voluming from both the blood and fat. FSDB T2 mapping was compared to conventional T2 mapping via simulations, phantom imaging, healthy-subject imaging (n = 8), and patient imaging (n = 7). In the healthy subjects, a high-resolution coplanar anatomical imaging was performed to provide a gold standard for segmentation of endocardium and epicardium. T2 maps were registered to the gold standard image to evaluate any inter-layer T2 difference, which is a surrogate for partial-voluming. RESULTS Simulations and phantom imaging showed that FSDB T2 mapping was accurate in a range of heartrates, off-resonance, and T2 values, and blood/fat reasonably nulled in a range of heartrates. In healthy subjects, FSDB T2 mapping showed similar T2 values over different myocardial layers in all 3 short-axis slices (e.g. basal epicardial/mid-wall/endocardial T2 = 42 ± 2 ms/41 ± 1 ms/42 ± 1 ms), whereas conventional T2 mapping showed considerably increased T2 in the endocardium and epicardium (e.g. basal epicardial/mid-wall/endocardial T2 = 48 ± 3 ms/43 ± 1 ms/49 ± 3 ms). The homogeneous T2 in the FSDB T2 mapping increased the apparent LV-wall thickness by 25-41% compared with the conventional method. CONCLUSIONS The proposed technique improves accuracy of myocardial T2 mapping against partial-voluming associated with both fat and blood, facilitating a multi-layer T2 evaluation of the myocardium. This technique may improve utility of cardiac T2 mapping in diseases affecting the endocardium and epicardium, and in patients with a small heart.
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Affiliation(s)
- Chenxi Hu
- The Institute of Medical Imaging Technology, School of Biomedical Engineering, Shanghai Jiao Tong University (SJTU), Shanghai, PR China.
| | - Steffen Huber
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, Yale University, New Haven, CT, United States of America
| | - Vinh Nguyen
- Cardiovascular Section, Department of Internal Medicine, Yale School of Medicine, Yale University, , New Haven, CT, United States of America
| | - Lauren Baldassarre
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, Yale University, New Haven, CT, United States of America; Cardiovascular Section, Department of Internal Medicine, Yale School of Medicine, Yale University, , New Haven, CT, United States of America
| | - Hamid Mojibian
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, Yale University, New Haven, CT, United States of America
| | - Dana Peters
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, Yale University, New Haven, CT, United States of America
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Stanton S, Peters D, Lavagnino M, Bidwell L, Manfredi J. 29 Forces exerted on the back during jumping in horses. J Equine Vet Sci 2021. [DOI: 10.1016/j.jevs.2021.103492] [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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11
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Toczek J, Hillmer AT, Han J, Liu C, Peters D, Emami H, Wu J, Esterlis I, Cosgrove KP, Sadeghi MM. FDG PET imaging of vascular inflammation in post-traumatic stress disorder: A pilot case-control study. J Nucl Cardiol 2021; 28:688-694. [PMID: 31073848 PMCID: PMC6842076 DOI: 10.1007/s12350-019-01724-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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: 01/22/2019] [Accepted: 04/02/2019] [Indexed: 01/23/2023]
Abstract
The prevalence of cardiovascular diseases (CVD) is increased in subjects with post-traumatic stress disorder (PTSD). Vascular inflammation mediates CVD and may be assessed by 18F-fluorodeoxyglucose (FDG) positron emission tomography (PET) imaging. In this pilot study, we investigated whether subjects with PTSD have enhanced vascular and systemic inflammation compared to healthy controls, as assessed by FDG PET imaging. METHODS A prospective group of 16 subjects (9 PTSD and 7 controls, age 34 ± 7) without prior history of CVD underwent FDG PET/CT imaging. The presence of PTSD symptoms at the time of the study was confirmed using PTSD checklist for DSM-5 (PCL5) questionnaire. Blood samples were collected to determine blood glucose, lipid and inflammatory biomarkers (tumor necrosis factor α, interleukin-1β, and interleukin-6) levels. FDG signal in the ascending aorta, amygdala, spleen and bone marrow was quantified. RESULTS The two groups matched closely with regards to cardiovascular risk factors. The inflammatory biomarkers were all within the normal range. There was no significant difference in FDG signal in the aorta (target to background ratio: 2.40 ± 0.29 and 2.34 ± 0.29 for control and PTSD subjects, difference: - 0.06, 95% confidence interval of difference: - 0.38 to 0.26), spleen, bone marrow, or amygdala between control and PTSD subjects. There was no significant correlation between aortic and amygdala FDG signal. However, a significant positive correlation existed between amygdala, splenic, and bone marrow FDG signal. CONCLUSION This pilot, small study did not reveal any difference in vascular or systemic inflammation as assessed by FDG PET imaging between PTSD and healthy control subjects. Because of the small number of subjects, a modest increase in vascular inflammation, which requires larger scale studies to establish, cannot be excluded. The correlation between FDG signal in amygdala, spleen and bone marrow may reflect a link between amygdala activity and systemic inflammation.
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Affiliation(s)
- Jakub Toczek
- Cardiovascular Molecular Imaging Laboratory, Section of Cardiovascular Medicine and Yale Cardiovascular Research Center, Yale University School of Medicine, 300 George Street, #770G, New Haven, CT, 06511, USA
- Veterans Affairs Connecticut Healthcare System, West Haven, CT, USA
| | - Ansel T Hillmer
- Department of Radiology and Biomedical Imaging, Yale University School of Medicine, New Haven, CT, USA
- Yale PET Center, Yale University School of Medicine, New Haven, CT, USA
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Jinah Han
- Cardiovascular Molecular Imaging Laboratory, Section of Cardiovascular Medicine and Yale Cardiovascular Research Center, Yale University School of Medicine, 300 George Street, #770G, New Haven, CT, 06511, USA
- Veterans Affairs Connecticut Healthcare System, West Haven, CT, USA
| | - Chi Liu
- Department of Radiology and Biomedical Imaging, Yale University School of Medicine, New Haven, CT, USA
- Yale PET Center, Yale University School of Medicine, New Haven, CT, USA
| | - Dana Peters
- Department of Radiology and Biomedical Imaging, Yale University School of Medicine, New Haven, CT, USA
| | - Hamed Emami
- Cardiovascular Molecular Imaging Laboratory, Section of Cardiovascular Medicine and Yale Cardiovascular Research Center, Yale University School of Medicine, 300 George Street, #770G, New Haven, CT, 06511, USA
| | - Jing Wu
- Department of Radiology and Biomedical Imaging, Yale University School of Medicine, New Haven, CT, USA
- Yale PET Center, Yale University School of Medicine, New Haven, CT, USA
| | - Irina Esterlis
- Veterans Affairs Connecticut Healthcare System, West Haven, CT, USA
- Yale PET Center, Yale University School of Medicine, New Haven, CT, USA
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Kelly P Cosgrove
- Department of Radiology and Biomedical Imaging, Yale University School of Medicine, New Haven, CT, USA
- Yale PET Center, Yale University School of Medicine, New Haven, CT, USA
- Department of Psychiatry, Yale University School of Medicine, New Haven, CT, USA
| | - Mehran M Sadeghi
- Cardiovascular Molecular Imaging Laboratory, Section of Cardiovascular Medicine and Yale Cardiovascular Research Center, Yale University School of Medicine, 300 George Street, #770G, New Haven, CT, 06511, USA.
- Veterans Affairs Connecticut Healthcare System, West Haven, CT, USA.
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Sabari JK, Park H, Tolcher AW, Ou SHI, Garon EB, George B, Janne PA, Moody SE, Tan EY, Sen SK, Peters D, Yan X, Christensen JG, Chi AS, Heist RS. KRYSTAL-2: A phase I/II trial of adagrasib (MRTX849) in combination with TNO155 in patients with advanced solid tumors with KRAS G12C mutation. J Clin Oncol 2021. [DOI: 10.1200/jco.2021.39.3_suppl.tps146] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
TPS146 Background: KRAS is the most frequently mutated oncogene in cancer and a key mediator of the RAS/MAPK signaling cascade that promotes cellular growth and proliferation. KRAS G12C tumor mutations occur in approximately 14% of patients with lung adenocarcinoma and 3-4% of colorectal adenocarinoma. SHP2 is a phosphatase that acts as a key mediator of signaling from receptor tyrosine kinases (RTKs) to downstream RAS/MAPK pathways. Adagrasib (MRTX849) is a specific small-molecule investigational inhibitor of KRAS G12C that covalently binds to and locks mutant KRAS in its GDP-bound inactive form. Adagrasib has been optimized for a long half-life and extensive tissue distribution to enable inhibition throughout the entire dosing interval. Preliminary results from a Phase 1/2 study of adagrasib demonstrated promising antitumor activity and tolerability across multiple KRAS G12C tumor types. TNO155 is a selective inhibitor of SHP2 with demonstrated inhibition of RTK signaling and significant antitumor activity in preclinical models. Preclinical studies have shown that resistance to KRAS G12C inhibition may be mediated by SHP2-dependent feedback loops. Because KRAS G12C retains some level of cycling between GTP- and GDP-bound states, KRAS G12C that is not bound by inhibitor can activate downstream signaling. Active SHP2 functions to increase the active state of RAS proteins (including mutant KRAS) and also increases ERK pathway activation. Therefore, the addition of TNO155 to adagrasib may augment antitumor activity and overcome resistance by inhibiting cycling to GTP-bound KRAS and/or through inhibition of feedback activation and more comprehensively inhibiting downstream ERK signaling. In KRAS G12C human tumor models, adagrasib combined with a SHP2 inhibitor demonstrated greater activity compared to each agent alone. These data provide support for clinical evaluation of this combination in KRAS G12C tumors. Methods: KRYSTAL-2 is a multicenter Phase 1/2 study evaluating adagrasib and TNO155 in patients with advanced solid tumors harboring a KRAS G12C mutation. Overall objectives of the trial include evaluating safety, tolerability, and PK. The Phase 1 portion will evaluate adagrasib and TNO155 utilizing a modified Toxicity Probability Interval dose escalation design to identify maximum tolerated dose and recommended Phase 2 dose. The Phase 2 portion utilizes a Simon's optimal two-stage design to evaluate the clinical activity of adagrasib with TNO155 in 2 cohorts of up to 108 patients—CRC (54 patients) and NSCLC (54 patients). Efficacy endpoints include Objective Response Rate (RECIST 1.1), Duration of Response (DOR), Progression-free Survival (PFS), and Overall Survival (OS). The study is currently enrolling and patients will receive study treatment until disease progression, unacceptable adverse events, patient withdrawal, or death. Clinical trial information: NCT04330664.
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Affiliation(s)
| | - Haeseong Park
- Washington University School of Medicine, St. Louis, MO
| | | | - Sai-Hong Ignatius Ou
- Chao Family Comprehensive Cancer Center, University of California Irvine, Orange, CA
| | - Edward B. Garon
- David Geffen School of Medicine, University of California/TRIO-US Network, Los Angeles, CA
| | - Ben George
- Froedtert & The Medical College of Wisconsin, Milwaukee, WI
| | | | | | - Eugene Y. Tan
- Novartis Pharmaceuticals Corporation, East Hanover, NJ
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Mussmann B, Hardy M, Rajalingam R, Peters D, McFadden S, Abdi AJ. Local diagnostic reference levels for skeletal surveys in suspected physical child abuse. Radiography (Lond) 2020; 27:425-429. [PMID: 33876733 DOI: 10.1016/j.radi.2020.10.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 10/05/2020] [Accepted: 10/06/2020] [Indexed: 10/23/2022]
Abstract
INTRODUCTION The purpose was to determine if an age based, local diagnostic reference level for paediatric skeletal surveys could be established using retrospective data. METHODS All children below two years of age referred for a primary skeletal survey as a result of suspected physical abuse during 2017 or 2018 (n = 45) were retrospectively included from a large Danish university hospital. The skeletal survey protocol included a total of 33 images. Dose Area Product (DAP) and acquisition parameters for all images were recorded from the Picture Archival and Communication System (PACS) and effective dose was estimated. The 75th percentile for DAP was considered as the diagnostic reference level (DRL). RESULTS The 75th percentile for DAP was 314 mGy∗cm2, 520 mGy∗cm2 and 779 mGy∗cm2 for children <1 month, 1-11 months and 12 < 24 months of age respectively. However, only the age group 1-11 months had a sufficient number of children (n = 27) to establish a local DRL. Thus, for the other groups the DAP result must be interpreted with caution. Effective dose was 0.19, 0.26 and 0.18 mSv for children <1, 1-11 months and 12 < 24 months of age respectively. CONCLUSION For children between 1 and 11 months of age, a local diagnostic reference level of 520 mGy∗cm2 was determined. This may be used as an initial benchmark for primary skeletal surveys as a result of suspected physical abuse for comparison and future discussion. IMPLICATIONS FOR PRACTICE While the data presented reflects the results of a single department, the suggested diagnostic reference level may be used as a benchmark for other departments when auditing skeletal survey radiation dose.
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Affiliation(s)
- B Mussmann
- Department of Radiology, Odense University Hospital, Denmark; Research and Innovation Unit, University of Southern, Denmark; Faculty of Health Sciences, Oslo Metropolitan University, Norway.
| | - M Hardy
- Faculty of Health Studies, University of Bradford, UK
| | - R Rajalingam
- Department of Radiography, University College Lillebaelt, Denmark
| | - D Peters
- Lillebaelt Hospital, Department of Radiology, Denmark
| | - S McFadden
- School of Health Sciences, University of Ulster, UK
| | - A J Abdi
- Department of Radiology, Odense University Hospital, Denmark; Research and Innovation Unit, University of Southern, Denmark
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Richter MJ, Peters D, Ghofrani HA, Naeije R, Roller F, Sommer N, Gall H, Grimminger F, Seeger W, Tello K. Evaluation and Prognostic Relevance of Right Ventricular-Arterial Coupling in Pulmonary Hypertension. Am J Respir Crit Care Med 2020; 201:116-119. [PMID: 31539478 DOI: 10.1164/rccm.201906-1195le] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
| | - Dana Peters
- Justus-Liebig-University GiessenGiessen, Germany
| | - Hossein A Ghofrani
- Justus-Liebig-University GiessenGiessen, Germany.,Rheuma and Thoracic CenterBad Nauheim, Germany.,Imperial College LondonLondon, United Kingdomand
| | | | - Fritz Roller
- Justus-Liebig-University GiessenGiessen, Germany
| | | | - Henning Gall
- Justus-Liebig-University GiessenGiessen, Germany
| | | | | | - Khodr Tello
- Justus-Liebig-University GiessenGiessen, Germany
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15
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Savic LJ, Schobert IT, Peters D, Walsh JJ, Laage-Gaupp FM, Hamm CA, Tritz N, Doemel LA, Lin M, Sinusas A, Schlachter T, Duncan JS, Hyder F, Coman D, Chapiro J. Molecular Imaging of Extracellular Tumor pH to Reveal Effects of Locoregional Therapy on Liver Cancer Microenvironment. Clin Cancer Res 2019; 26:428-438. [PMID: 31582517 DOI: 10.1158/1078-0432.ccr-19-1702] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 07/24/2019] [Accepted: 09/30/2019] [Indexed: 02/06/2023]
Abstract
PURPOSE To establish magnetic resonance (MR)-based molecular imaging paradigms for the noninvasive monitoring of extracellular pH (pHe) as a functional surrogate biomarker for metabolic changes induced by locoregional therapy of liver cancer. EXPERIMENTAL DESIGN Thirty-two VX2 tumor-bearing New Zealand white rabbits underwent longitudinal imaging on clinical 3T-MRI and CT scanners before and up to 2 weeks after complete conventional transarterial chemoembolization (cTACE) using ethiodized oil (lipiodol) and doxorubicin. MR-spectroscopic imaging (MRSI) was employed for pHe mapping. Multiparametric MRI and CT were performed to quantify tumor enhancement, diffusion, and lipiodol coverage of the tumor posttherapy. In addition, incomplete cTACE with reduced chemoembolic doses was applied to mimic undertreatment and exploit pHe mapping to detect viable tumor residuals. Imaging findings were correlated with histopathologic markers indicative of metabolic state (HIF-1α, GLUT-1, and LAMP-2) and viability (proliferating cell nuclear antigen and terminal deoxynucleotidyl-transferase dUTP nick-end labeling). RESULTS Untreated VX2 tumors demonstrated a significantly lower pHe (6.80 ± 0.09) than liver parenchyma (7.19 ± 0.03, P < 0.001). Upregulation of HIF-1α, GLUT-1, and LAMP-2 confirmed a hyperglycolytic tumor phenotype and acidosis. A gradual tumor pHe increase toward normalization similar to parenchyma was revealed within 2 weeks after complete cTACE, which correlated with decreasing detectability of metabolic markers. In contrast, pHe mapping after incomplete cTACE indicated both acidic viable residuals and increased tumor pHe of treated regions. Multimodal imaging revealed durable tumor devascularization immediately after complete cTACE, gradually increasing necrosis, and sustained lipiodol coverage of the tumor. CONCLUSIONS MRSI-based pHe mapping can serve as a longitudinal monitoring tool for viable tumors. As most liver tumors are hyperglycolytic creating microenvironmental acidosis, therapy-induced normalization of tumor pHe may be used as a functional biomarker for positive therapeutic outcome.
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Affiliation(s)
- Lynn Jeanette Savic
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut.,Institute of Radiology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität, and Berlin Institute of Health, Berlin, Germany
| | - Isabel Theresa Schobert
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut.,Institute of Radiology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität, and Berlin Institute of Health, Berlin, Germany
| | - Dana Peters
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut
| | - John J Walsh
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut
| | - Fabian Max Laage-Gaupp
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut
| | - Charlie Alexander Hamm
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut.,Institute of Radiology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität, and Berlin Institute of Health, Berlin, Germany
| | - Nina Tritz
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut
| | - Luzie A Doemel
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut.,Institute of Radiology, Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität, and Berlin Institute of Health, Berlin, Germany
| | - MingDe Lin
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut.,Visage Imaging, Inc., San Diego, California
| | - Albert Sinusas
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut.,Department of Internal Medicine (Cardiology), Yale School of Medicine, New Haven, Connecticut
| | - Todd Schlachter
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut
| | - James S Duncan
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut.,Department of Biomedical Engineering, Yale School of Engineering and Applied Science, New Haven, Connecticut
| | - Fahmeed Hyder
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut
| | - Daniel Coman
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut
| | - Julius Chapiro
- Department of Radiology and Biomedical Imaging, Yale School of Medicine, New Haven, Connecticut.
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16
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Hassani-Mehraban A, Dullemans AM, Verhoeven JTJ, Roenhorst JW, Peters D, van der Vlugt RAA, Kormelink R. Alstroemeria yellow spot virus (AYSV): a new orthotospovirus species within a growing Eurasian clade. Arch Virol 2019; 164:117-126. [PMID: 30288607 PMCID: PMC6347659 DOI: 10.1007/s00705-018-4027-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Accepted: 08/28/2018] [Indexed: 12/31/2022]
Abstract
An orthotospovirus distinct from all other orthotospoviruses was isolated from naturally infected alstroemeria plants. Disease symptoms caused by this virus mainly consisted of yellow spots on the leaves based on which the name alstroemeria yellow spot virus (AYSV) was coined. A host range analysis was performed and a polyclonal antiserum was produced against purified AYSV ribonucleoproteins which only reacted with the homologous antigen and not with any other (established or tentative) orthotospovirus from a selection of American and Asian species. Upon thrips transmission assays the virus was successfully transmitted by a population of Thrips tabaci. The entire nucleotide sequence of the M and S RNA segments was elucidated by a conventional cloning and sequencing strategy, and contained 4797 respectively 2734 nucleotides (nt). Simultaneously, a next generation sequencing (NGS) approach (RNAseq) was employed and generated contigs covering the entire viral tripartite RNA genome. In addition to the M and S RNA nucleotide sequences, the L RNA (8865 nt) was obtained. The nucleocapsid (N) gene encoded by the S RNA of this virus consisted of 819 nucleotides with a deduced N protein of 272 amino acids and by comparative sequence alignments to other established orthotospovirus species showed highest homology (69.5% identity) to the N protein of polygonum ringspot virus. The data altogether support the proposal of AYSV as a new orthotospovirus species within a growing clade of orthotospoviruses that seem to share the Middle East basin as a region of origin.
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Affiliation(s)
- A Hassani-Mehraban
- Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - A M Dullemans
- Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - J Th J Verhoeven
- The National Plant Protection Organisation (NPPO) of the Netherlands, P.O. Box 9102, 6700 HC, Wageningen, The Netherlands
| | - J W Roenhorst
- The National Plant Protection Organisation (NPPO) of the Netherlands, P.O. Box 9102, 6700 HC, Wageningen, The Netherlands
| | - D Peters
- Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - R A A van der Vlugt
- Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - R Kormelink
- Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands.
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Deady M, Peters D, Lang H, Calvo R, Glozier N, Christensen H, Harvey SB. Designing smartphone mental health applications for emergency service workers. Occup Med (Lond) 2018; 67:425-428. [PMID: 28535246 DOI: 10.1093/occmed/kqx056] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Background Emergency service workers are often exposed to trauma and have increased risk of a range of mental health (MH) conditions. Smartphone applications have the potential to provide this group with effective psychological interventions; however, little is known about the acceptability and preferences regarding such initiatives. Aims To describe the preferences and opinions of emergency service workers regarding the use of smartphone MH applications and to examine the impact of age on these preferences. Methods Participants were recruited from four metropolitan Fire and Rescue NSW stations and responded to questionnaire items covering three key domains: current smartphone use, potential future use and preferences for design and content as well as therapeutic techniques. Results Overall, approximately half the sample (n = 106) claimed they would be interested in trying a tailored emergency-worker MH smartphone application. There were few differences between age groups on preferences. The majority of respondents claimed they would use an app for mental well-being daily and preferred terms such as 'well-being' and 'mental fitness' for referring to MH. Confidentiality, along with a focus on stress, sleep, exercise and resiliency were all considered key features. Behavioural therapeutic techniques were regarded most favourably, compared with other therapies. Conclusions Emergency workers were interested in utilizing smartphone applications focused on MH, but expressed clear preferences regarding language used in promotion, features required and therapeutic techniques preferred.
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Affiliation(s)
- M Deady
- University of New South Wales, Sydney, New South Wales 2052, Australia
| | - D Peters
- School of Electrical and Information Engineering, University of Sydney, Sydney, New South Wales 2006, Australia
| | - H Lang
- University of New South Wales, Sydney, New South Wales 2052, Australia
| | - R Calvo
- School of Electrical and Information Engineering, University of Sydney, Sydney, New South Wales 2006, Australia
| | - N Glozier
- Brain and Mind Centre, University of Sydney, Sydney, New South Wales 2006, Australia
| | - H Christensen
- Black Dog Institute, Sydney, New South Wales 2031, Australia
| | - S B Harvey
- University of New South Wales, Sydney, New South Wales 2052, Australia.,Black Dog Institute, Sydney, New South Wales 2031, Australia.,St George Hospital, Sydney, New South Wales 2217, Australia
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Davis SR, Peters D, Calvo RA, Sawyer SM, Foster JM, Smith L. "Kiss myAsthma": Using a participatory design approach to develop a self-management app with young people with asthma. J Asthma 2017; 55:1018-1027. [PMID: 29064746 DOI: 10.1080/02770903.2017.1388391] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Objective: Young people with asthma often lack engagement in self-management. Smartphone apps offer an attractive, immediate method for obtaining asthma information and self-management support. In this research we developed an evidence-based asthma app tailored to young peoples needs, created using a participatory design approach to optimize user engagement. This paper describes the participatory design process. Methods: This multi-phased research included concept generation and ideation of app design by young people with asthma, and development of asthma information by the research team. Clinical review was sought regarding safety and accuracy of app content. Participants suggestions for improvement and any problems with the app were logged throughout. Our young co-designers were invited back to test a high fidelity prototype app using a "think aloud" process and completed a usability questionnaire. Results: Twenty asthma patients aged 15-24 years contributed to the initial app design. Three respiratory specialists and two pharmacists suggested minor corrections to clinical terminology in the app which were all incorporated. Nine co-designers acted as expert reviewers of the prototype app, of whom eight completed a usability questionnaire. Median usability scores (maximum score 6) indicated high satisfaction with app content, usefulness and ease of use [median item score 5.3 (range 4.7-6.0)]. All feedback was incorporated to create an updated prototype app. Conclusions: A clinically sound asthma app has been developed which is considered highly acceptable to the young co-designers. A six-week test of the engagement, acceptability, and usefulness of the app in young people not involved in the participatory design will follow.
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Affiliation(s)
- S R Davis
- a Faculty of Pharmacy , University of Sydney , NSW , Australia
| | - D Peters
- b School of Electrical and Information Engineering , University of Sydney , Sydney , NSW , Australia
| | - R A Calvo
- b School of Electrical and Information Engineering , University of Sydney , Sydney , NSW , Australia
| | - S M Sawyer
- c Centre for Adolescent Health, Royal Children's Hospital, Department of Paediatrics , The University of Melbourne, Murdoch Childrens Research Institute , Melbourne , VIC , Australia
| | - J M Foster
- d Clinical Management Group, Woolcock Institute of Medical Research , University of Sydney , Sydney , NSW , Australia
| | - L Smith
- a Faculty of Pharmacy , University of Sydney , NSW , Australia
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Peters D. The Ebola epidemic in Liberia: the role of communities and local leadership in overcoming catastrophe and building health system resilience. Eur J Public Health 2017. [DOI: 10.1093/eurpub/ckx187.588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- D Peters
- John Hopkins University, Baltimore, United States
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20
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Nielsen BD, Eckert SM, Robison CI, Mills J, Peters D, Pease A, Schott II HC. Omeprazole and its impact on mineral absorption in horses. Anim Prod Sci 2017. [DOI: 10.1071/an17323] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Omeprazole is commonly used to treat and prevent ulcers in horses. As a proton-pump inhibitor, and with absorption of calcium dependent on gastric acidity, there is concern that reduction in acidity may interfere with calcium absorption. The present study was conducted to evaluate whether daily omeprazole administration can influence bone health in horses. Prior to commencement of treatment, 10 Standardbred geldings underwent endoscopic examinations for gastric ulcers and to determine gastric pH. They were fed a grass-hay diet. Three-day total collections of faeces and urine were performed to evaluate mineral balance. The left third metacarpus was radiographed to establish baseline values of mineral content by using a radiographic photo-densitometry technique to calculate radiographic bone aluminium equivalence, and blood samples were taken for examination of markers of bone metabolism. The horses were pair-matched and randomly assigned to either a treatment or the control group. Treated horses received omeprazole at the preventative dose (1 mg/kg bodyweight) and control horses received no medication for the duration of the 8-week study. They were housed in box stalls and had daily turnout on drylots. Endoscopy was performed again at the completion of the study, total collections were performed again at the middle and end of the study and blood samples were taken every 2 weeks. No meaningful treatment effects were found for ulcers, gastric pH, mineral balance, radiographic bone aluminium equivalence, or markers of bone formation. Daily administration of omeprazole did not appear to have any negative effects on indices of skeletal health measured in the study.
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Pouessel D, Neuzillet Y, Mertens LS, van der Heijden MS, de Jong J, Sanders J, Peters D, Leroy K, Manceau A, Maille P, Soyeux P, Moktefi A, Semprez F, Vordos D, de la Taille A, Hurst CD, Tomlinson DC, Harnden P, Bostrom PJ, Mirtti T, Horenblas S, Loriot Y, Houédé N, Chevreau C, Beuzeboc P, Shariat SF, Sagalowsky AI, Ashfaq R, Burger M, Jewett MAS, Zlotta AR, Broeks A, Bapat B, Knowles MA, Lotan Y, van der Kwast TH, Culine S, Allory Y, van Rhijn BWG. Tumor heterogeneity of fibroblast growth factor receptor 3 (FGFR3) mutations in invasive bladder cancer: implications for perioperative anti-FGFR3 treatment. Ann Oncol 2016; 27:1311-6. [PMID: 27091807 DOI: 10.1093/annonc/mdw170] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [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: 02/04/2016] [Accepted: 04/06/2016] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Fibroblast growth factor receptor 3 (FGFR3) is an actionable target in bladder cancer. Preclinical studies show that anti-FGFR3 treatment slows down tumor growth, suggesting that this tyrosine kinase receptor is a candidate for personalized bladder cancer treatment, particularly in patients with mutated FGFR3. We addressed tumor heterogeneity in a large multicenter, multi-laboratory study, as this may have significant impact on therapeutic response. PATIENTS AND METHODS We evaluated possible FGFR3 heterogeneity by the PCR-SNaPshot method in the superficial and deep compartments of tumors obtained by transurethral resection (TUR, n = 61) and in radical cystectomy (RC, n = 614) specimens and corresponding cancer-positive lymph nodes (LN+, n = 201). RESULTS We found FGFR3 mutations in 13/34 (38%) T1 and 8/27 (30%) ≥T2-TUR samples, with 100% concordance between superficial and deeper parts in T1-TUR samples. Of eight FGFR3 mutant ≥T2-TUR samples, only 4 (50%) displayed the mutation in the deeper part. We found 67/614 (11%) FGFR3 mutations in RC specimens. FGFR3 mutation was associated with pN0 (P < 0.001) at RC. In 10/201 (5%) LN+, an FGFR3 mutation was found, all concordant with the corresponding RC specimen. In the remaining 191 cases, RC and LN+ were both wild type. CONCLUSIONS FGFR3 mutation status seems promising to guide decision-making on adjuvant anti-FGFR3 therapy as it appeared homogeneous in RC and LN+. Based on the results of TUR, the deep part of the tumor needs to be assessed if neoadjuvant anti-FGFR3 treatment is considered. We conclude that studies on the heterogeneity of actionable molecular targets should precede clinical trials with these drugs in the perioperative setting.
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Affiliation(s)
- D Pouessel
- Inserm U955, Hôpital Henri Mondor, APHP, Team 7 Translational Research of Genito-Urinary Oncogenesis, Créteil Department of Medical Oncology, Hôpital Saint-Louis, AP-HP, Paris, France
| | | | | | | | | | - J Sanders
- Pathology Molecular Pathology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, The Netherlands
| | - D Peters
- Molecular Pathology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, The Netherlands
| | | | | | | | - P Soyeux
- Inserm U955, Hôpital Henri Mondor, APHP, Team 7 Translational Research of Genito-Urinary Oncogenesis, Créteil
| | | | - F Semprez
- Inserm U955, Hôpital Henri Mondor, APHP, Team 7 Translational Research of Genito-Urinary Oncogenesis, Créteil
| | - D Vordos
- Urology, Hôpital Henri Mondor, APHP, Créteil, France
| | - A de la Taille
- Inserm U955, Hôpital Henri Mondor, APHP, Team 7 Translational Research of Genito-Urinary Oncogenesis, Créteil Urology, Hôpital Henri Mondor, APHP, Créteil, France
| | - C D Hurst
- Leeds Institute of Cancer and Pathology, St James's University Hospital, Leeds, UK
| | - D C Tomlinson
- Leeds Institute of Cancer and Pathology, St James's University Hospital, Leeds, UK
| | - P Harnden
- Leeds Institute of Cancer and Pathology, St James's University Hospital, Leeds, UK
| | - P J Bostrom
- Departments of Urology Department of Surgical Oncology (Urology), University Health Network, Princess Margaret Cancer Centre, University of Toronto, Toronto
| | - T Mirtti
- Pathology, University of Turku, Turku, Finland
| | | | - Y Loriot
- Department of Cancer Medicine and INSERM U981, Gustave Roussy, Cancer Campus, Grand Paris, Villejuif
| | - N Houédé
- Department of Oncological Medicine, Institut Bergonié, Bordeaux
| | - C Chevreau
- Department of Oncological Medicine, Institut Claudius Régaud, Toulouse
| | - P Beuzeboc
- Department of Oncological Medicine, Institut Curie, Paris, France
| | - S F Shariat
- Departments of Urology Department of Urology, Medical University of Vienna, Vienna General Hospital, Vienna, Austria
| | | | - R Ashfaq
- Pathology, University of Texas, Southwestern Medical Center, Dallas, USA
| | - M Burger
- Department of Urology, Caritas St Josef Medical Centre, University of Regensburg, Regensburg, Germany
| | - M A S Jewett
- Department of Surgical Oncology (Urology), University Health Network, Princess Margaret Cancer Centre, University of Toronto, Toronto
| | - A R Zlotta
- Department of Surgical Oncology (Urology), University Health Network, Princess Margaret Cancer Centre, University of Toronto, Toronto Departments of Surgery (Urology)
| | - A Broeks
- Molecular Pathology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, The Netherlands
| | - B Bapat
- Cancer Genetics, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, University of Toronto, Toronto
| | - M A Knowles
- Leeds Institute of Cancer and Pathology, St James's University Hospital, Leeds, UK
| | | | - T H van der Kwast
- Department of Pathology, University Health Network, Princess Margaret Cancer Centre, University of Toronto, Toronto, Canada
| | - S Culine
- Department of Medical Oncology, Hôpital Saint-Louis, AP-HP, Paris, France Department of Medical Oncology, Paris 7 University, Paris
| | - Y Allory
- Inserm U955, Hôpital Henri Mondor, APHP, Team 7 Translational Research of Genito-Urinary Oncogenesis, Créteil Departments of Pathology Department of Pathology, Université Paris Est, UPEC, Créteil, France
| | - B W G van Rhijn
- Departments of Surgical Oncology (Urology) Department of Urology, Caritas St Josef Medical Centre, University of Regensburg, Regensburg, Germany Department of Surgical Oncology (Urology), University Health Network, Princess Margaret Cancer Centre, University of Toronto, Toronto Departments of Surgery (Urology) Cancer Genetics, Samuel Lunenfeld Research Institute, Mount Sinai Hospital, University of Toronto, Toronto
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Hache G, Guiard BP, Nguyen TH, Quesseveur G, Gardier AM, Peters D, Munro G, Coudoré F. Antinociceptive activity of the new triple reuptake inhibitor NS18283 in a mouse model of chemotherapy-induced neuropathic pain. Eur J Pain 2015; 19:322-33. [PMID: 25045036 DOI: 10.1002/ejp.550] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/27/2014] [Indexed: 01/11/2023]
Abstract
BACKGROUND Chronic neuropathic pain can lead to anxiety and depression. Drugs that block reuptake of serotonin, norepinephrine and/or dopamine are widely used to treat depression, and have emerged as useful drugs in the treatment of neuropathic pain. This study compared the acute antinociceptive effects of NS18283, a novel triple monoamine reuptake inhibitor (MRI) with indatraline, venlafaxine and escitalopram in a mouse model of neuropathic pain. METHOD Neuropathic pain-like behaviours were induced in mice by repeated injections of oxaliplatin (OXA), and assessed using the von Frey hair test, the cold plate test and the thermal preference plate test. Anxio/depressive phenotype and antidepressant-like properties of compounds were assessed by the novelty suppressed feeding test and the tail suspension test, respectively. RESULTS In vivo microdialysis experiments showed that each MRI increased extracellular serotonin, norepinephrine and/or dopamine levels in the cingulate cortex, in agreement with their in vitro reuptake inhibitory properties. Indatraline (3 mg/kg) reversed the full repertoire of OXA-induced neuropathic hypersensitivity. NS18283 (10 mg/kg) reversed OXA-induced mechano-hypersensitivity and cold allodynia. Venlafaxine (16 mg/kg) and escitalopram (4 mg/kg) only reversed cold allodynia and mechano-hypersensitivity, respectively. All MRIs produced antidepressant-like activity in anxio/depressive phenotype of OXA mice. CONCLUSIONS Acute administration of drugs that enhance the activity of serotonin, norepinephrine and dopamine neurotransmission within nociceptive pathways may provide a broader spectrum of antinociception than dual or selective reuptake inhibitors in animal models of neuropathic pain. Whether similar observations would occur after repeated administration of such compounds in an attempt to simulate dosing in humans, or be compromised by dopaminergic-mediated adverse effects warrants further investigation.
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Affiliation(s)
- G Hache
- Faculty of Pharmacy, Paris Sud University, Châtenay-Malabry Cedex, France
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Speck U, Stolzenburg N, Peters D, Scheller B. How does a drug-coated balloon work? Overview about coating technologies and their impact. J Cardiovasc Surg (Torino) 2015:R37Y9999N00A150095. [PMID: 26681536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
BACKGROUND According to current understanding the drug-coated balloon carries a sufficient dose of an effective antineoplastic agent, i.e. paclitaxel, to the target lesion. METHODS Literature review and report on experimental studies simulating the access of coated balloons to the treatment site and studies in pigs. RESULTS The drug adheres to the balloon membrane and is partially hidden below the folds which are wrapped around the shaft. Upon inflation solid paclitaxel particles are pushed into the vessel wall. Premature loss of paclitaxel and transfer to the vessel wall is controlled by the formulation including an inactive additive. Particles in the tissue dissolve slowly resulting in a terminal half-life of almost 2 months. Premature loss of the drug, dissolution, elimination, efficacy and tolerance are limited by the very low solubility of paclitaxel. From exemplary DCB approximately 10% of drug is lost before the target lesion is reached, 5-20% is transferred into the vessel wall and 10% remain on the balloon after withdrawal. The difference is distributed in the general circulation. Inhibition of neointimal proliferation in animal models is reliable and as persistent as with drug-eluting stents. Histology reveals slight to moderate dose-dependent downstream effects without functional or clinical symptoms. CONCLUSION For the time being paclitaxel remains the drug of choice, the dose varies between 2 and 3.5 μg/mm² balloon surface. Neither in animal experiments nor in clinical trials problems have been detected in vessel segments treated with overlapping balloons. Future developments are expected improving efficacy in additional disease conditions (e.g., calcified vessels) and vessel territories.
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Affiliation(s)
- U Speck
- Experimental Radiology, Department of Radiology, Charité, Berlin, Germany - ulrich.speck @charite.de
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Neuzillet Y, Mertens L, Shariat S, Bostrom P, Mirtti T, Sagalowsky A, Ashfaq R, Broeks A, Van der Heijden M, Peters D, Curial C, De Jong J, Horenblas S, Hurst C, Tomlinson D, Knowles M, Bapat B, Jewett M, Zlotta A, Sanders J, Lotan Y, Van der Kwast T, Van Rhijn B. [Not Available]. Prog Urol 2015; 24:806-7. [PMID: 26461579 DOI: 10.1016/j.purol.2014.08.054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Y Neuzillet
- Service d'urologie, hôpital Foch, université de Versailles-Saint-Quentin-en-Yvelines, Suresnes, France.
| | - L Mertens
- Urology and Pathology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Pays-Bas
| | - S Shariat
- Urology and Pathology, University of Texas, Southwestern Medical center, Dallas, États-unis
| | - P Bostrom
- Urology, Pathology and Molecular medicine, University Health Network, Princess Margaret Hospital and Mount Sinai Hospital, University of Toronto, Toronto, Canada
| | - T Mirtti
- Urology and Pathology, University of Turku, Turku, Finlande
| | - A Sagalowsky
- Urology and Pathology, University of Texas, Southwestern Medical center, Dallas, États-unis
| | - R Ashfaq
- Urology and Pathology, University of Texas, Southwestern Medical center, Dallas, États-unis
| | - A Broeks
- Urology and Pathology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Pays-Bas
| | - M Van der Heijden
- Urology and Pathology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Pays-Bas
| | - D Peters
- Urology and Pathology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Pays-Bas
| | - C Curial
- Urology and Pathology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Pays-Bas
| | - J De Jong
- Urology and Pathology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Pays-Bas
| | - S Horenblas
- Urology and Pathology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Pays-Bas
| | - C Hurst
- Leeds Institute of Molecular Medicine, St James's University Hospital, Leeds, Royaume-Uni
| | - D Tomlinson
- Leeds Institute of Molecular Medicine, St James's University Hospital, Leeds, Royaume-Uni
| | - M Knowles
- Leeds Institute of Molecular Medicine, St James's University Hospital, Leeds, Royaume-Uni
| | - B Bapat
- Urology, Pathology and Molecular medicine, University Health Network, Princess Margaret Hospital and Mount Sinai Hospital, University of Toronto, Toronto, Canada
| | - M Jewett
- Urology, Pathology and Molecular medicine, University Health Network, Princess Margaret Hospital and Mount Sinai Hospital, University of Toronto, Toronto, Canada
| | - A Zlotta
- Urology, Pathology and Molecular medicine, University Health Network, Princess Margaret Hospital and Mount Sinai Hospital, University of Toronto, Toronto, Canada
| | - J Sanders
- Urology and Pathology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Pays-Bas
| | - Y Lotan
- Urology and Pathology, University of Texas, Southwestern Medical center, Dallas, États-unis
| | - T Van der Kwast
- Urology, Pathology and Molecular medicine, University Health Network, Princess Margaret Hospital and Mount Sinai Hospital, University of Toronto, Toronto, Canada
| | - B Van Rhijn
- Urology and Pathology, Netherlands Cancer Institute, Antoni van Leeuwenhoek Hospital, Amsterdam, Pays-Bas
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Galiana G, Peters D, Tam L, Constable RT. Multiecho acquisition of O-space data. Magn Reson Med 2014; 72:1648-57. [PMID: 24459076 PMCID: PMC4108571 DOI: 10.1002/mrm.25085] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [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: 04/29/2013] [Revised: 11/25/2013] [Accepted: 11/25/2013] [Indexed: 11/08/2022]
Abstract
PURPOSE Nonlinear gradient encoding methods, such as O-Space imaging, have been shown to provide good images from very few echoes. Acquiring data in a train of spin or gradient echoes is a very flexible way to further speed acquisition time. However, combining these strategies presents significant challenges, both in terms of the contrast and artifacts. We present strategies in both pulse sequence design and image processing to mitigate these effects. THEORY AND METHODS The three strategies include a new echo ordering that takes into account the unique way that O-Space samples the k-space of the image; a new postprocessing filter that allows tuning of T2-weighting by emphasizing the contribution of low frequency spatial information at selectable points in space and time; and an offset between linear and nonlinear gradients that makes the central point of each echo unique. RESULTS Simulations indicate that these strategies mitigate artifacts introduced by T2 (or T2*) decay and produce contrast that reflects relaxation at a given echo time. CONCLUSION Turbo spin echo O-Space is theoretically feasible, and the greater undersampling should make it possible to use shorter echo trains for a given scan time.
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Affiliation(s)
- Gigi Galiana
- Yale University, Department of Diagnostic Radiology, Biomedical Engineering, Neurosurgery, New Haven, Connecticut, USA
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Kamenova I, Peters D. The Differential Reactivity of Two Polyclonal Antisera to Plum Pox Virus Isolates Collected at Different Stages After Immunization. BIOTECHNOL BIOTEC EQ 2014. [DOI: 10.1080/13102818.1999.10819014] [Citation(s) in RCA: 1] [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] Open
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Karim R, Housden RJ, Balasubramaniam M, Chen Z, Perry D, Uddin A, Al-Beyatti Y, Palkhi E, Acheampong P, Obom S, Hennemuth A, Lu Y, Bai W, Shi W, Gao Y, Peitgen HO, Radau P, Razavi R, Tannenbaum A, Rueckert D, Cates J, Schaeffter T, Peters D, MacLeod R, Rhode K. Evaluation of current algorithms for segmentation of scar tissue from late gadolinium enhancement cardiovascular magnetic resonance of the left atrium: an open-access grand challenge. J Cardiovasc Magn Reson 2013; 15:105. [PMID: 24359544 PMCID: PMC3878126 DOI: 10.1186/1532-429x-15-105] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2013] [Accepted: 12/10/2013] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Late Gadolinium enhancement (LGE) cardiovascular magnetic resonance (CMR) imaging can be used to visualise regions of fibrosis and scarring in the left atrium (LA) myocardium. This can be important for treatment stratification of patients with atrial fibrillation (AF) and for assessment of treatment after radio frequency catheter ablation (RFCA). In this paper we present a standardised evaluation benchmarking framework for algorithms segmenting fibrosis and scar from LGE CMR images. The algorithms reported are the response to an open challenge that was put to the medical imaging community through an ISBI (IEEE International Symposium on Biomedical Imaging) workshop. METHODS The image database consisted of 60 multicenter, multivendor LGE CMR image datasets from patients with AF, with 30 images taken before and 30 after RFCA for the treatment of AF. A reference standard for scar and fibrosis was established by merging manual segmentations from three observers. Furthermore, scar was also quantified using 2, 3 and 4 standard deviations (SD) and full-width-at-half-maximum (FWHM) methods. Seven institutions responded to the challenge: Imperial College (IC), Mevis Fraunhofer (MV), Sunnybrook Health Sciences (SY), Harvard/Boston University (HB), Yale School of Medicine (YL), King's College London (KCL) and Utah CARMA (UTA, UTB). There were 8 different algorithms evaluated in this study. RESULTS Some algorithms were able to perform significantly better than SD and FWHM methods in both pre- and post-ablation imaging. Segmentation in pre-ablation images was challenging and good correlation with the reference standard was found in post-ablation images. Overlap scores (out of 100) with the reference standard were as follows: Pre: IC = 37, MV = 22, SY = 17, YL = 48, KCL = 30, UTA = 42, UTB = 45; Post: IC = 76, MV = 85, SY = 73, HB = 76, YL = 84, KCL = 78, UTA = 78, UTB = 72. CONCLUSIONS The study concludes that currently no algorithm is deemed clearly better than others. There is scope for further algorithmic developments in LA fibrosis and scar quantification from LGE CMR images. Benchmarking of future scar segmentation algorithms is thus important. The proposed benchmarking framework is made available as open-source and new participants can evaluate their algorithms via a web-based interface.
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Affiliation(s)
- Rashed Karim
- Department of Imaging Sciences & Biomedical Engineering, King’s College London, London, UK
| | - R James Housden
- Department of Imaging Sciences & Biomedical Engineering, King’s College London, London, UK
| | | | - Zhong Chen
- Department of Imaging Sciences & Biomedical Engineering, King’s College London, London, UK
| | - Daniel Perry
- Utah Center for Advanced Imaging Research, University of Utah, Salt Lake City, Utah, USA
| | - Ayesha Uddin
- Department of Imaging Sciences & Biomedical Engineering, King’s College London, London, UK
| | - Yosra Al-Beyatti
- Department of Imaging Sciences & Biomedical Engineering, King’s College London, London, UK
| | - Ebrahim Palkhi
- Department of Imaging Sciences & Biomedical Engineering, King’s College London, London, UK
| | - Prince Acheampong
- Department of Imaging Sciences & Biomedical Engineering, King’s College London, London, UK
| | - Samantha Obom
- Department of Imaging Sciences & Biomedical Engineering, King’s College London, London, UK
| | - Anja Hennemuth
- Fraunhofer Institute for Medical Image Computing, Fraunhofer MEVIS, Bremen, Germany
| | - YingLi Lu
- Imaging Research, Sunnybrook Health Sciences Centre, Toronto, Canada
| | - Wenjia Bai
- Department of Computing, Imperial College London, London, UK
| | - Wenzhe Shi
- Department of Computing, Imperial College London, London, UK
| | - Yi Gao
- Psychiatry Neuroimaging Lab, Harvard Medical School, Boston, USA
| | - Heinz-Otto Peitgen
- Fraunhofer Institute for Medical Image Computing, Fraunhofer MEVIS, Bremen, Germany
| | - Perry Radau
- Imaging Research, Sunnybrook Health Sciences Centre, Toronto, Canada
| | - Reza Razavi
- Department of Imaging Sciences & Biomedical Engineering, King’s College London, London, UK
| | - Allen Tannenbaum
- School of Electrical and Computer Engineering, Boston University, Boston, USA
| | - Daniel Rueckert
- Department of Computing, Imperial College London, London, UK
| | - Josh Cates
- Utah Center for Advanced Imaging Research, University of Utah, Salt Lake City, Utah, USA
| | - Tobias Schaeffter
- Department of Imaging Sciences & Biomedical Engineering, King’s College London, London, UK
| | - Dana Peters
- Magnetic Resonance Research Centre, Yale School of Medicine, Yale University, New Haven, USA
- Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, USA
| | - Rob MacLeod
- Utah Center for Advanced Imaging Research, University of Utah, Salt Lake City, Utah, USA
| | - Kawal Rhode
- Department of Imaging Sciences & Biomedical Engineering, King’s College London, London, UK
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Isachenko V, Isachenko E, Peters D, Mallmann P, Morgenstern B, Kellerwessel E, Otarbaev M, Baikoshkarova S, Shalakhmetova T, Rahimi G. In vitro perfusion of whole bovine ovaries by freezing medium: effect of perfusion rate and elapsed time after extraction. Clin Lab 2013; 59:1159-66. [PMID: 24273941 DOI: 10.7754/clin.lab.2013.130635] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
BACKGROUND Cryopreservation and transplantation of the whole ovary with vascular pedicle would be helpful to prevent posttransplantation ischemia. In fact, perfusion of the intact mammalian ovary through arteries and veins is the most technically difficult part of the whole cryopreservation process because of its complexity. It is important to develop the technology of long-time perfusion of intact ovaries by cryoprotectants at low temperatures because it was established earlier that 24-hour cooling to 5 degrees C before cryopreservation is beneficial for the freezing of human ovarian tissue. The aim of this research was to study the effectiveness of perfusion of intact bovine ovaries with different rates of perfusion and elapsed time between extraction of these ovaries and beginning of perfusion. METHODS Arteria ovarica was cannulated and ovaries were perfused with Leibovitz L-15 medium + 100 IU/mL heparin + 5% bovine calf serum + 6% dimethyl sulfoxide + 6% ethylene glycol + 0.15 M sucrose + Indian ink at room temperature (22 degrees C). In the first cycle of experiments, ovaries (n = 145) were perfused for 60 minutes during 1 to 1.5 hours after extraction of ovaries in the slaughter house at perfusion rates of 150 mL/hour (2.5 mL/minute), 100 mL/hour (1.67 mL/minute), 75 mL/hour (1.25 mL/minute), 50 mL/hour (0.83 mL/minute), 25 mL/hour (0.42 mL/minute), and 12.5 mL/hour (0.21 mL/minute) for groups 1, 2, 3, 4, 5, and 6, respectively. In the second cycle of experiments, ovaries (n = 29) were perfused with a rate of 25 mL/hour (0.42 mL/minute) for 60 minutes during the following time-periods elapsed after extraction of ovaries in the slaughter house: 3 hours (n = 18), 4 hours (n = 5), 5 hours (n = 3), and 6 hours (n = 3) for groups 1, 2, 3, and 4, respectively. Ovaries in luteal and follicular phase of development were distributed randomly into groups. Successful perfusion of blood vessels was detected visibly by a blue coloration of the vascular pedicle and ovarian tissues. The percentage of Indian ink-perfused tissues was detected. The intensity of the vascular leakage and tissue damage was scored microscopically and noted as follows: lack of disruption (-), weak disruption (+), moderate disruption (++), and strong disruption RESULTS The first cycle of experiments shows that an optimal perfusion rate was established for groups 4 and 5 (50 and 25 mL/hour, respectively). In the second cycle of experiments, good perfusion of ovaries with the perfusion rate of 25 mL/hour was established only for ovaries of group 1 (3 hours after extraction). The effectiveness of perfusion in group 2 (4 hours after extraction) was sharply decreased. CONCLUSIONS Effective perfusion of bovine intact ovaries with vascular pedicle with freezing medium (6% ethylene glycol + 6% dimethyl sulfoxide + 0.15 M sucrose) at room temperature includes a rate of perfusion 25 or 50 mL/ hour. Ovaries must be perfused no later than 3 hours after the death of animals.
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Affiliation(s)
- V Isachenko
- Department of Obstetrics and Gynaecology, Cologne University, Cologne, Germany
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Sørensen A, Peters D, Fründ E, Lingman G, Christiansen O, Uldbjerg N. Changes in human placental oxygenation during maternal hyperoxia estimated by blood oxygen level-dependent magnetic resonance imaging (BOLD MRI). Ultrasound Obstet Gynecol 2013; 42:310-314. [PMID: 23303592 DOI: 10.1002/uog.12395] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/30/2012] [Indexed: 06/01/2023]
Abstract
OBJECTIVES To investigate changes in human placental oxygenation during maternal hyperoxia using non-invasive blood oxygen level-dependent (BOLD) magnetic resonance imaging (MRI). METHODS Eight healthy pregnant women with uncomplicated singleton pregnancies at gestational weeks 28-36 were examined with BOLD MRI, over two consecutive 5-min periods of different oxygenation: first normoxia (21% O2 ) and then hyperoxia (12 L O2 /min), achieved by controlling the maternal oxygen supply with a non-rebreather facial mask. Selecting three slices showing cross-sections of the central part of the placenta, we investigated total placental oxygenation by drawing regions of interest (ROIs) covering the entire placenta, and regional placental oxygenation by drawing smaller ROIs in the darker and brighter areas of the placenta. For each ROI, the difference in BOLD signal between the two episodes was determined and the percentage increase in BOLD signal during hyperoxia (ΔBOLD) was calculated. RESULTS In the BOLD image, the normoxic placenta appeared heterogeneous, with darker areas located to the fetal side and brighter areas to the maternal side. During hyperoxia, the placenta became brighter and the structure more homogeneous, and the BOLD signal of the total placenta increased (ΔBOLDtot , 15.2 ± 3.2% (mean ± SD), P < 0.0001). The increase was seen predominantly in the dark areas in the fetal part of the placenta (ΔBOLDfet , 32.1 ± 9.3%) compared with in the bright areas in the maternal part of the placenta (ΔBOLDmat , 5.4 ± 3.5%). CONCLUSION During hyperoxia, placental oxygenation was increased predominantly in the darker placental areas, which, given their anatomical location, represent the fetal circulation of the placenta. To our knowledge, this is the first study to successfully visualize changes in placental oxygenation using BOLD MRI.
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Affiliation(s)
- A Sørensen
- Department of Obstetrics and Gynecology, Aalborg University Hospital, Reberbangade, Aalborg, Denmark.
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Bayat H, Verhoeven JTJ, Botermans M, Peters D, Hassani-Mehraban A. First Report of a 16SrIX Group ('Candidatus Phytoplasma phoenicium'-Related) Phytoplasma Associated with a Chrysanthemum Disease. Plant Dis 2013; 97:1110. [PMID: 30722519 DOI: 10.1094/pdis-01-13-0050-pdn] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In November 2010, approximately 2% of the chrysanthemum (Chrysanthemum morifolium) cv. Paniz plants showed numerous small leaves in the top and stunting in a field collection of the National Research Center of Ornamental Plants in Mahallat, Iran. Next to these plants, some plants of the same collection showed leaves with a reddish and/or chlorotic discoloration around the veins. The observed symptoms were believed to represent infection by a phytoplasma and/or a viroid. Two plants with each type of the symptoms were individually analyzed. Using a total RNA extract from diseased leaves, RT-PCR with primer pairs targeting all known pospiviroids, including Chrysanthemum stunt viroid (CSVd) (3), were negative. Purified DNA was examined for the highly conserved phytoplasma 16S rRNA gene by nested-PCR using the universal primer sets P1/P7 and R16F2n/R16R2 (2). Fragments of 1.2 kb, obtained only from the plants with the small leaves and stunting, were sequenced and one of these sequences, which were identical, was deposited in GenBank (Accession No. KC176800). BLAST analysis of the chrysanthemum phytoplasma sequence exhibited 99% identity to Candidatus Phytoplasma phoenicium (Ca. P. phoenicium) species of the 16SrIX group. Subsequently, in silico RFLP analysis of the nested PCR product with the pDRAW32 program using AluI and TaqI restriction sites used for 16SrIX subgroups A, B, C, D, and E indicated that the 16SrIX chrysanthemum isolate belonged to subgroup D (1). Recently, based on GenBank sequences, several strains of Ca. P. phoenicium have been isolated and identified from diverse host species like Lactuca serriola, L. sativa, Solanum lycopersicon, Sonchus sp. [16SrIX-E], Carthamus tinctorius, and Prunus amygdalus [16SrIX-B] (4) in Iran. The vector species transmitting Ca. P. phoenicium to C. morifolium still needs to be identified. The leafhopper Neoaliturus fenestratus may be a potential vector as it is an often encountered efficient transmitter vector of 16SrIX group phytoplasmas in Iran (2). Next to the susceptibility of chrysanthemum to members of aster yellows, stolbur, and Ca. P. aurantifolia phytoplasma groups, this is, to our knowledge, the first report of a 16SrIX group member infecting chrysanthemum. The detection of this phytoplasma in chrysanthemum can form a new threat to this crop and other ornamentals in the Mahallat flower production region. References: (1) R. E. Davis et al. New Dis. Rep. 20:35, 2010. (2) M. Salehi et al. Plant Pathol. 56:669, 2007. (3) J. Th. J. Verhoeven et al. Eur. J. Plant Pathol. 110:823, 2004. (4) M. G. Zamharir. Afr. J. Microbiol. Res. 5:6013, 2011.
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Affiliation(s)
- H Bayat
- National Research Center of Ornamental Plants, Mahallat, Iran
| | - J Th J Verhoeven
- National Plant Protection Organization of the Netherlands, Wageningen
| | - M Botermans
- National Plant Protection Organization of the Netherlands, Wageningen
| | - D Peters
- Wageningen University, the Netherlands
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Lynch C, Tee N, Rouse H, Gordon A, Sati L, Zeiss C, Soygur B, Bassorgun I, Goksu E, Demir R, McGrath J, Groendahl ML, Thuesen L, Andersen AN, Loft A, Smitz J, Adriaenssens T, Vikesa J, Borup R, Mersy E, Kisters N, Macville MVE, Engelen JJM, Consortium SENN, Menheere PPCA, Geraedts JP, Coumans ABC, Frints SGM, Aledani T, Assou S, Traver S, Ait-ahmed O, Dechaud H, Hamamah S, Mizutani E, Suzumori N, Sugiyama C, Hattori Y, Sato T, Ando H, Ozaki Y, Sugiura-Ogasawara M, Wissing M, Kristensen SG, Andersen CY, Mikkelsen AL, Hoest T, Borup R, Groendahl ML, Velthut-Meikas A, Simm J, Metsis M, Salumets A, Palini S, Galluzzi L, De Stefani S, Primiterra M, Wells D, Magnani M, Bulletti C, Vogt PH, Frank-Herrmann P, Bender U, Strowitzki T, Besikoglu B, Heidemann P, Wunsch L, Bettendorf M, Jelinkova L, Vilimova S, Kosarova M, Sebek P, Volemanova E, Kruzelova M, Civisova J, Svobodova L, Sobotka V, Mardesic T, van de Werken C, Santos MA, Eleveld C, Laven JSE, Baart EB, Pylyp LY, Spinenko LA, Zukin VD, Perez-Sanz J, Matorras R, Arluzea J, Bilbao J, Gonzalez-Santiago N, Yeh N, Koff A, Barlas A, Romin Y, Manova-Todorova K, Hoz CDL, Mauri AL, Nascimento AM, Vagnini LD, Petersen CG, Ricci J, Massaro FC, Cavagna M, Pontes A, Oliveira JBA, Baruffi RLR, Franco JG, Wu EX, Ma S, Parriego M, Sole M, Boada M, Coroleu B, Veiga A, Kakourou G, Poulou M, Vrettou C, Destouni A, Traeger-Synodinos J, Kanavakis E, Yatsenko AN, Georgiadis AP, McGuire MM, Zorrilla M, Bunce KD, Peters D, Rajkovic A, Olszewska M, Kurpisz M, Gilbertson AZA, Ottolini CS, Summers MC, Sage K, Handyside AH, Thornhill AR, Griffin DK, Chung MK, Kim JW, Lee JH, Jeong HJ, Kim MH, Ryu MJ, Park SJ, Kang HY, Lee HS, Zimmermann B, Banjevic M, Hill M, Lacroute P, Dodd M, Sigurjonsson S, Lau P, Prosen D, Chopra N, Ryan A, Hall M, McAdoo S, Demko Z, Levy B, Rabinowitz M, Vereczeky A, Kosa ZS, Savay S, Csenki M, Nanassy L, Dudas B, Domotor ZS, Debreceni D, Rossi A, Alegretti JR, Cuzzi J, Bonavita M, Tanada M, Matunaga P, Fettback P, Rosa MB, Maia V, Hassun P, Motta ELA, Piccolomini M, Gomes C, Barros B, Nicoliello M, Matunaga P, Criscuolo T, Bonavita M, Alegretti JR, Miyadahira E, Cuzzi J, Hassun P, Motta ELA, Montjean D, Benkhalifa M, Berthaut I, Griveau JF, Morcel K, Bashamboo A, McElreavey K, Ravel C, Rubio C, Rodrigo L, Mateu E, Mercader A, Peinado V, Buendia P, Milan M, Delgado A, Al-Asmar N, Escrich L, Campos-Galindo I, Garcia-Herrero S, Poo ME, Mir P, Simon C, Reyes-Engel A, Cortes-Rodriguez M, Lendinez A, Perez-Nevot B, Palomares AR, Galdon MR, Ruberti A, Minasi MG, Biricik A, Colasante A, Zavaglia D, Iammarrone E, Fiorentino F, Greco E, Demir N, Ozturk S, Sozen B, Morales R, Lledo B, Ortiz JA, Ten J, Llacer J, Bernabeu R, Nagayoshi M, Tanaka A, Tanaka I, Kusunoki H, Watanabe S, Temel SG, Beyazyurek C, Ekmekci GC, Aybar F, Cinar C, Kahraman S, Nordqvist S, Karehed K, Akerud H, Ottolini CS, Griffin DK, Thornhill AR, Handyside AH, Gultomruk M, Tulay P, Findikli N, Yagmur E, Karlikaya G, Ulug U, Bahceci M, Bargallo MF, Arevalo MR, Salat MM, Barbat IV, Lopez JT, Algam ME, Boluda AB, de Oya GC, Tolmacheva EN, Kashevarova AA, Skryabin NA, Lebedev IN, Semaco E, Belo A, Riboldi M, Cuzzi J, Barros B, Luz L, Criscuolo T, Nobrega N, Matunaga P, Mazetto R, Alegretti JA, Bibancos M, Hassun P, Motta ELA, Serafini P, Neupane J, Vandewoestyne M, Heindryckx B, Deroo T, Lu Y, Ghimire S, Lierman S, Qian C, Deforce D, De Sutter P, Rodrigo L, Rubio C, Mateu E, Peinado V, Milan M, Viloria T, Al-Asmar N, Mercader A, Buendia P, Delgado A, Escrich L, Martinez-Jabaloyas JM, Simon C, Gil-Salom M, Capalbo A, Treff N, Cimadomo D, Tao X, Ferry K, Ubaldi FM, Rienzi L, Scott RT, Katzorke N, Strowitzki T, Vogt HP, Hehr A, Gassner C, Paulmann B, Kowalzyk Z, Klatt M, Krauss S, Seifert D, Seifert B, Hehr U, Minasi MG, Ruberti A, Biricik A, Lobascio M, Zavaglia D, Varricchio MT, Fiorentino F, Greco E, Rubino P, Bono S, Cotarelo RP, Spizzichino L, Biricik A, Colicchia A, Giannini P, Fiorentino F, Suhorutshenko M, Rosenstein-Tamm K, Simm J, Salumets A, Metsis M. Reproductive (epi)genetics. Hum Reprod 2013. [DOI: 10.1093/humrep/det220] [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: 11/14/2022] Open
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Timmermann DB, Sandager-Nielsen K, Dyhring T, Smith M, Jacobsen AM, Nielsen EØ, Grunnet M, Christensen JK, Peters D, Kohlhaas K, Olsen GM, Ahring PK. Augmentation of cognitive function by NS9283, a stoichiometry-dependent positive allosteric modulator of α2- and α4-containing nicotinic acetylcholine receptors. Br J Pharmacol 2013; 167:164-82. [PMID: 22506660 DOI: 10.1111/j.1476-5381.2012.01989.x] [Citation(s) in RCA: 82] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND AND PURPOSE Positive allosteric modulation of α4β2 nicotinic acetylcholine (nACh) receptors could add a new dimension to the pharmacology and therapeutic approach to these receptors. The novel modulator NS9283 was therefore tested extensively. EXPERIMENTAL APPROACH Effects of NS9283 were evaluated in vitro using fluorescence-based Ca(2+) imaging and electrophysiological voltage clamp experiments in Xenopus oocytes, mammalian cells and thalamocortical neurons. In vivo the compound was tested in models covering a range of cognitive domains in mice and rats. KEY RESULTS NS9283 was shown to increase agonist-evoked response amplitude of (α4)(3) (β2)(2) nACh receptors in electrophysiology paradigms. (α2)(3) (β2)(2) , (α2)(3) (β4)(2) and (α4)(3) (β4)(2) were modulated to comparable extents, but no effects were detected at α3-containing or any 2α : 3β stoichiometry nACh receptors. Native nACh receptors in thalamocortical neurons similarly displayed DHβE-sensitive currents that were receptive to modulation. NS9283 had favourable effects on sensory information processing, as shown by reversal of PCP-disrupted pre-pulse inhibition. NS9283 further improved performance in a rat model of episodic memory (social recognition), a rat model of sustained attention (five-choice serial reaction time task) and a rat model of reference memory (Morris water maze). Importantly, the effects in the Morris water maze could be fully reversed with mecamylamine, a blocker of nACh receptors. CONCLUSIONS AND IMPLICATIONS These results provide compelling evidence that positive allosteric modulators acting at the (α4)(3) (β2)(2) nACh receptors can augment activity across a broad range of cognitive domains, and that α4β2 nACh receptor allosteric modulation therefore constitutes a promising therapeutic approach to symptomatic treatment of cognitive impairment.
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Peters D, Boyd KU. Case 1: Exposed tissue expander / Case 2: Groin flap. Plast Surg (Oakv) 2013. [DOI: 10.4172/plastic-surgery.1000800] [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: 11/09/2022] Open
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Bragard C, Caciagli P, Lemaire O, Lopez-Moya JJ, MacFarlane S, Peters D, Susi P, Torrance L. Status and prospects of plant virus control through interference with vector transmission. Annu Rev Phytopathol 2013; 51:177-201. [PMID: 23663003 DOI: 10.1146/annurev-phyto-082712-102346] [Citation(s) in RCA: 102] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Most plant viruses rely on vector organisms for their plant-to-plant spread. Although there are many different natural vectors, few plant virus-vector systems have been well studied. This review describes our current understanding of virus transmission by aphids, thrips, whiteflies, leafhoppers, planthoppers, treehoppers, mites, nematodes, and zoosporic endoparasites. Strategies for control of vectors by host resistance, chemicals, and integrated pest management are reviewed. Many gaps in the knowledge of the transmission mechanisms and a lack of available host resistance to vectors are evident. Advances in genome sequencing and molecular technologies will help to address these problems and will allow innovative control methods through interference with vector transmission. Improved knowledge of factors affecting pest and disease spread in different ecosystems for predictive modeling is also needed. Innovative control measures are urgently required because of the increased risks from vector-borne infections that arise from environmental change.
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Affiliation(s)
- C Bragard
- Earth & Life Institute, Université Catholique de Louvain, B-1348 Louvain-la-Neuve, Belgium.
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Galiana G, Stockmann JP, Tam L, Peters D, Tagare H, Constable RT. The Role of Nonlinear Gradients in Parallel Imaging: A k-Space Based Analysis. Concepts Magn Reson Part A Bridg Educ Res 2012; 40A:253-267. [PMID: 26604857 PMCID: PMC4655121 DOI: 10.1002/cmr.a.21243] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Sequences that encode the spatial information of an object using nonlinear gradient fields are a new frontier in MRI, with potential to provide lower peripheral nerve stimulation, windowed fields of view, tailored spatially-varying resolution, curved slices that mirror physiological geometry, and, most importantly, very fast parallel imaging with multichannel coils. The acceleration for multichannel images is generally explained by the fact that curvilinear gradient isocontours better complement the azimuthal spatial encoding provided by typical receiver arrays. However, the details of this complementarity have been more difficult to specify. We present a simple and intuitive framework for describing the mechanics of image formation with nonlinear gradients, and we use this framework to review some the main classes of nonlinear encoding schemes.
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Affiliation(s)
- Gigi Galiana
- Department of Diagnostic Radiology, Yale University, New Haven, CT
| | - Jason P Stockmann
- Department of Biomedical Engineering, Yale University, New Haven, CT
| | - Leo Tam
- Department of Biomedical Engineering, Yale University, New Haven, CT
| | - Dana Peters
- Department of Diagnostic Radiology, Yale University, New Haven, CT
| | - Hemant Tagare
- Department of Diagnostic Radiology, Yale University, New Haven, CT ; Department of Biomedical Engineering, Yale University, New Haven, CT
| | - R Todd Constable
- Department of Diagnostic Radiology, Yale University, New Haven, CT ; Department of Biomedical Engineering, Yale University, New Haven, CT ; Department of Neurosurgery, Yale University, New Haven, CT
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Tomlinson JA, Ostoja-Starzewska S, Adams IP, Miano DW, Abidrabo P, Kinyua Z, Alicai T, Dickinson MJ, Peters D, Boonham N, Smith J. Loop-mediated isothermal amplification for rapid detection of the causal agents of cassava brown streak disease. J Virol Methods 2012; 191:148-54. [PMID: 22820076 DOI: 10.1016/j.jviromet.2012.07.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2012] [Revised: 07/05/2012] [Accepted: 07/11/2012] [Indexed: 11/30/2022]
Abstract
The causal agents of cassava brown streak disease have recently been identified as Cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus (UCBSV). Primers have been developed for rapid detection of these viruses by reverse transcription loop-mediated isothermal amplification (RT-LAMP). Performance of the RT-LAMP assays compared favourably with published RT-PCR and real-time RT-PCR methods. Furthermore, amplification by RT-LAMP is completed in 40 min and does not require thermal cycling equipment. Modification of the RT-LAMP reactions to use labelled primers allowed rapid detection of amplification products using lateral flow devices containing antibodies specific to the incorporated labels, avoiding the need for fluorescence detection or gel electrophoresis.
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Affiliation(s)
- J A Tomlinson
- The Food and Environment Research Agency, Sand Hutton, York YO41 1LZ, United Kingdom.
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Saboor F, Berndt C, Peters D, Weissmann N, Schermuly RT, Müller D, Middendorff R. Nestin reveals progenitor cells in pulmonary vascular wall. Pneumologie 2012. [DOI: 10.1055/s-0032-1315545] [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: 10/28/2022]
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Peters D, Boyd KU. Case 1: Delayed breast reconstruction / Case 2: Escharotomies. Plast Surg (Oakv) 2012. [DOI: 10.4172/plastic-surgery.1000782] [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: 11/09/2022] Open
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Stoppe C, Peters D, Fahlenkamp AV, Cremer J, Rex S, Schälte G, Rossaint R, Coburn M. aepEX monitor for the measurement of hypnotic depth in patients undergoing balanced xenon anaesthesia. Br J Anaesth 2011; 108:80-8. [PMID: 22139005 DOI: 10.1093/bja/aer393] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [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] Open
Abstract
BACKGROUND Previously, we showed a significant difference in the measurements of hypnotic depth by the bispectral index (BIS) and auditory-evoked potentials (AEPs) using the A-line autoregressive index during xenon anaesthesia. In the present study, we evaluate the alternative AEP-based auditory-evoked potential index (aepEX) for the measurement of hypnotic depth in patients undergoing general anaesthesia with xenon. METHODS Forty-two patients undergoing elective abdominal surgery were enrolled in this controlled, double-blinded, randomized, clinical study. Patients were randomized to receive either xenon (n=21) or sevoflurane anaesthesia (n=21). During anaesthesia, BIS values were recorded simultaneously with the aepEX monitoring. The anaesthetist performing the anaesthesia was blinded to the hypnotic depth monitors. After surgery, the incidence of recalls and awareness was evaluated. RESULTS Patients' characteristics such as gender, age, and weight did not differ between the groups. The aepEX and BIS values behaved similarly during anaesthesia. The comparison of aepEX values during xenon and sevoflurane anaesthesia revealed significantly lower aepEX values in the xenon group after 25 min [xenon: 32.9 (4.8) vs sevoflurane: 39.3 (9.0); P=0.008] and after 35 min [xenon: 31.4 (6.6) vs sevoflurane: 37.0 (6.8); P=0.012]. During anaesthesia, aepEX values correlated with the clinical evaluation of depth of anaesthesia (e.g. >20% changes of the baseline arterial pressure or heart rate, spontaneous breathing and/or intolerance of mechanical ventilation, coughing, abdominal pressing, sweating, eye tearing). CONCLUSIONS We found the aepEX monitor to provide index in the range of adequate depth of xenon anaesthesia, when combined with remifentanil infusion in intubated patients undergoing elective abdominal surgery.
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Affiliation(s)
- C Stoppe
- Department of Anaesthesiology, RWTH University Hospital, Pauwelsstr. 30, D-52074 Aachen, Germany
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Haag S, Chen M, Peters D, Keck C, Taskoparan B, Fahr A, Teutloff C, Bittl R, Lademann J, Schäfer-Korting M, Meinke M. Nanostructured lipid carriers as nitroxide depot system measured by electron paramagnetic resonance spectroscopy. Int J Pharm 2011; 421:364-9. [DOI: 10.1016/j.ijpharm.2011.10.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2011] [Revised: 09/30/2011] [Accepted: 10/01/2011] [Indexed: 11/25/2022]
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Abstract
During the last decade, lisianthus (Eustoma grandiflorum) has been introduced in Iran in the horticultural cut-flower industry. This crop is currently produced in more than 800 small greenhouses on a surface of an estimated 0.8 km2 in the Pakdasht region (southeast of Teheran Province). Plants exhibiting virus-like symptoms were observed in several greenhouses in 2010. The infected plants produced yellow and necrotic spots on the leaves and became severely deformed because of a strong leaf curling and the production of shorter internodes. Flower breaking has not been observed in the blue flowering plants. Approximately 85% of the plants were apparently infected in the inspected greenhouses. Extracts of infected material inoculated onto some indicator plant species induced mosaic and leaf malformation on Nicotiana benthamiana, mottling on Capsicum annuum, necrotic lesions on Datura stramonium, chlorotic local spots on Vigna unguiculata, systemic necrotic spots on Emilia sonchifolia, chlorotic local spots on Cucumis sativus, and necrotic local lesions on Petunia hybrida. Back-inoculation of infected material on lisianthus seedlings resulted in several chlorotic spots on the inoculated leaves and a severe downward curling of the systemic infected leaves. No symptoms were observed after inoculation of Pisum sativum, Phaseolus vulgaris, Vicia faba, and Chrysanthemum spp. The virus could also be transferred from infected to healthy N. benthamiana plants by pricking leaves with a Pasteur pipette. Spherical tombusvirus-like particles of approximately 29 nm were found by transmission electron microscopy in leaf-dip and partially-purified preparations of infected N. benthamiana. Since Tomato bushy stunt virus (TBSV; genus Tombusvirus, family Tombusviridae) and Moroccan pepper virus (MPV) have been found in Iran, we studied by using ELISA whether our samples matched with TBSV. Since a negative response was obtained, two primers were designed on the basis of the available sequences of the coat protein in the GenBank (Accession No. EU27780) of an MPV isolate from soil in Fars Province, Iran. A reverse transcription (RT)-PCR of total RNA extract from infected lisianthus and N. benthamiana with the primers MPV-R (5'-TTACAACAATGTGGCATCATTG-3') and MPV-F (5'-ATGGCAATGGTAGTAAG AAAC-3') resulted in a DNA fragment of 1,176 bp. This fragment from N. benthamiana was cloned, sequenced (Accession No. HQ663881), and showed a 96% nucleotide and 99% amino acid identity with the coat protein of the soil isolate. MPV was originally found in pepper (1), tomato and pelargonium (4), pear tree (3), and surface water (2). To our knowledge, this is the first report of MPV on lisianthus in Iran and worldwide. This virus, which persists in soil, water, and plant debris, can be considered as a substantial threat for the lisianthus industry in Iran because farmers do not apply strict crop rotation or other sanitation measures. References: (1) H. U. Fischer and B. E. L. Lockhart. Phytopathology 67:1352, 1977. (2) R. Koenig and D.-E. Lesemann. Phytopathol. Z. 112:105, 1985. (3) M. Russo et al. J. Plant Pathol. 84:161, 2002. (4) H. J. Vetten and R. Koenig. 108:215, 1983.
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Affiliation(s)
- N Beikzadeh
- Hasheminejad, Higher Education Center, P.O. Box 91375-4887, Mashhad, Iran
| | - D Peters
- Laboratory of Virology, Department of Plant Sciences, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, the Netherlands
| | - A Hassani-Mehraban
- Laboratory of Virology, Department of Plant Sciences, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, the Netherlands
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Ndikumana I, Gasoré R, Issaka S, Pinel‐Galzi A, Onasanya A, Hassani‐Mehraban A, Fargette D, Peters D, Séré Y. Rice yellow mottle virus
in rice in Rwanda: first report and evidence of strain circulation. ACTA ACUST UNITED AC 2011. [DOI: 10.5197/j.2044-0588.2011.023.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- I. Ndikumana
- Institut des Sciences Agronomiques du Rwanda (ISAR)BP138ButareRwanda
| | - R. Gasoré
- Institut des Sciences Agronomiques du Rwanda (ISAR)BP138ButareRwanda
| | - S. Issaka
- Africa Rice Center (AfricaRice)01 BP 2031CotonouBénin
| | - A. Pinel‐Galzi
- Institut de Recherche pour le Développement (IRD)BP 6450134394Montpellier cedex 5France
| | - A. Onasanya
- Africa Rice Center (AfricaRice)01 BP 2031CotonouBénin
| | - A. Hassani‐Mehraban
- Laboratory of VirologyDepartment of Plant SciencesWageningen UniversityWageningenThe Netherlands
| | - D. Fargette
- Institut de Recherche pour le Développement (IRD)BP 6450134394Montpellier cedex 5France
| | - D. Peters
- Laboratory of VirologyDepartment of Plant SciencesWageningen UniversityWageningenThe Netherlands
| | - Y. Séré
- Africa Rice Center (AfricaRice)01 BP 2031CotonouBénin
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Sooriakumaran P, John M, Leung R, Peters D, Lee D, Wiklund P, Tewari A. A multi-institutional study of 3,794 patients undergoing robotic-assisted laparoscopic radical prostatectomy to determine the surgical learning curve for positive margins and operating time. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.7_suppl.102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
102 Background: The surgical learning curve for robotic assisted laparoscopic radical prostatectomy (RALP) is often cited as being shorter than for other surgical modalities. However, while this appears true with regards to surgical safety, the learning curve for more refined variables like positive surgical margin (PSM) rate and operative time (OT) is not well established. Our objective was to assess the surgical learning curve for RALP in terms of these parameters. Methods: We performed a retrospective cohort study of 3,794 patients who underwent RALP between Jan 2003 and Sep 2009 by three surgeons (DL, PW, AKT) from three centers (UPenn, Karolinska, Cornell). Mean overall PSM rates and mean overall OT were calculated for all three surgeons at intervals of 50 RALPs per surgeon, and learning curves for these means were fit using a loess method. R version 2.71 was used for all statistical analysis. Results: The learning curve for PSM rates for all patients demonstrated improvements that continued with greater surgeon experience, with over 1,600 cases required to get a PSM rate <10%. When only pT3 patients were evaluated, the learning curve started to plateau after 1,000-1,500 cases. Mean OT plateaued after 750 cases although with further surgical experience the OTs started to climb again. Conclusions: The learning curve for RALP is not as short as previously thought, and a large number of cases are needed to get PSM rates and OTs to a minimum. This suggests that RALP should be performed by high volume surgeons in order to optimize patient outcomes. [Table: see text]
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Affiliation(s)
- P. Sooriakumaran
- Weill Cornell Medical College, New York, NY; University of Pennsylvania, Philadelphia, PA; Karolinska Institute, Stockholm, Sweden
| | - M. John
- Weill Cornell Medical College, New York, NY; University of Pennsylvania, Philadelphia, PA; Karolinska Institute, Stockholm, Sweden
| | - R. Leung
- Weill Cornell Medical College, New York, NY; University of Pennsylvania, Philadelphia, PA; Karolinska Institute, Stockholm, Sweden
| | - D. Peters
- Weill Cornell Medical College, New York, NY; University of Pennsylvania, Philadelphia, PA; Karolinska Institute, Stockholm, Sweden
| | - D. Lee
- Weill Cornell Medical College, New York, NY; University of Pennsylvania, Philadelphia, PA; Karolinska Institute, Stockholm, Sweden
| | - P. Wiklund
- Weill Cornell Medical College, New York, NY; University of Pennsylvania, Philadelphia, PA; Karolinska Institute, Stockholm, Sweden
| | - A. Tewari
- Weill Cornell Medical College, New York, NY; University of Pennsylvania, Philadelphia, PA; Karolinska Institute, Stockholm, Sweden
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Peters D, Klöpping C, Krüger K, Pilat C, Katta S, Seimetz M, Ghofrani HA, Schermuly RT, Seeger W, Grimminger F, Mooren F, Weissmann N. Reversal of experimental hypoxia-induced pulmonary hypertension by moderate exercise training in mice. Pneumologie 2011. [DOI: 10.1055/s-0031-1272113] [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]
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Fahlenkamp A, Peters D, Biener I, Billoet C, Apfel C, Rossaint R, Coburn M. Evaluation of bispectral index and auditory evoked potentials for hypnotic depth monitoring during balanced xenon anaesthesia compared with sevoflurane. Br J Anaesth 2010; 105:334-41. [DOI: 10.1093/bja/aeq163] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Widana Gamage SMK, Hassani-Mehraban A, Peters D. Identification of Iris yellow spot virus on Leek (Allium porrum) in Sri Lanka. Plant Dis 2010; 94:1070. [PMID: 30743450 DOI: 10.1094/pdis-94-8-1070b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Leek (Allium porrum) has become one of the major leafy vegetable export crops in Sri Lanka during last few years. This year-round crop is cultivated in open fields at elevations between 1,000 and 2,000 m on approximately 1,600 ha with a production of 27,000 t per year (2). In August 2009, straw-colored spots (2 to 3 mm in diameter), surrounded by a greenish halo and a necrotic area, resembling symptoms to those caused by Iris yellow spot virus (IYSV) were observed on leek in Kandapola in the Nuwara Eliya District. Additional thrips damage consisting of silver-colored spots was observed on all plants. IYSV (family Bunyaviridae, genus Tospovirus) was first described and characterized in the Netherlands in 1998 (1). During the last few years, this virus was reported from Australia, Brazil, Chile, France, Germany, Guatemala, India, Israel, New Zealand, Peru, Reunion Island, Serbia, South Africa, Spain, the United States (4), and Japan. Collected samples were initially analyzed for IYSV infections using antisera raised against nucleocapsid (N) protein in a double-antibody sandwich (DAS)-ELISA. The presence of IYSV was confirmed by a reverse transcription (RT)-PCR using IYSV-F-373 (5'CTGCGGGCTTCTCTGG3') and IYSV-R-779 (5'GACTCACCAATGTCTTCAAC3') primers that amplify a 400-bp fragment of the N gene. The entire N gene was not obtained when specific primers were used to retrieve the complete N gene. Four nucleotides of the reverse primer GAAAGATAGATATAATTAA (indicated in bold) did not match with sequence at the 3'end of the N gene. Hence, to obtain the remaining parts of the N gene, the primers UHP (5'CACTGGATCCTTTTGTTTTTGTTTTTTG3') and Asian Termini (5'CCCGGATCCAGAGCAATCGAGGY3') (3) were combined with IYSV-F and IYSV-R. The obtained amplicons were cloned into pGEM-T easy vector and sequenced. The N gene sequence has been deposited at the NCBI/GenBank (Accession No. GU901211). The deduced N protein sequence(s) were compared with other IYSV N protein sequences available in the GenBank and showed a 92% protein identity with the Brazilian strain (IYSV-BR) and 97% with the Dutch strain (IYSV-NL) with Accession Nos. AAF04199 and AAB61923, respectively. No data on the thrips vector species or on the disease incidence have been collected. The presence of IYSV in Sri Lanka can potentially be considered as a threat for the export of leek. To our knowledge, this is the first report that IYSV occurs in Sri Lanka. References: (1) I. Cortêz et al. Phytopathology 88:1276, 1998. (2) Department of Census and Statistics Sri Lanka. Retrieved from http://www.statistics.gov.lk , 2009. (3) A. Hassani-Mehraban et al. Phytopathology 95:852, 2005. (4) H. R. Pappu et al. Virus Res. 141:219, 2009.
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Affiliation(s)
- S M K Widana Gamage
- Department of Botany, University of Ruhuna, Matara, Sri Lanka, and Laboratory of Virology, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, the Netherlands
| | - A Hassani-Mehraban
- Laboratory of Virology, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, the Netherlands
| | - D Peters
- Laboratory of Virology, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, the Netherlands
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Malysz J, Dyhring T, Ahring P, Olsen G, Peters D, Gronlien J, Wetterstrand C, Ween H, Haakerud M, Thorin-Hagene K, Andersen E, Anderson D, Hu M, Kroeger P, Lee CH, Gopalakrishnan M, Timmermann D. In vitro pharmacological profile of a novel α4β2 positive allosteric modulator NS9283 (A-969933). Biochem Pharmacol 2009. [DOI: 10.1016/j.bcp.2009.06.080] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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