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Tran TM, Ho GY, Chu S. Patient-Derived Xenograft Models for Ovarian Cancer. Methods Mol Biol 2024; 2806:187-196. [PMID: 38676803 DOI: 10.1007/978-1-0716-3858-3_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2024]
Abstract
Patient-derived xenograft (PDX) models play a crucial role for in vivo research. They maintain the original molecular characteristics of the human tumor and provide a more accurate tumor microenvironment, which cannot be replicated by in vitro models. This chapter describes four different transplantation methods, namely, intra-bursal, intrarenal capsule, intraperitoneal, and subcutaneous, to develop PDX models for ovarian cancer research.
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Affiliation(s)
- Trang Minh Tran
- Hudson Institute of Medical Research, Clayton, VIC, Australia
- School of Clinical Sciences, Monash University, Clayton, VIC, Australia
| | - Gwo Yaw Ho
- School of Clinical Sciences, Monash University, Clayton, VIC, Australia
- Monash Health, Clayton, VIC, Australia
| | - Simon Chu
- Hudson Institute of Medical Research, Clayton, VIC, Australia.
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2
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Le KC, Jeong H, Tran TM. Theory of transition from brittle to ductile fracture. Phys Rev E 2023; 107:055006. [PMID: 37328972 DOI: 10.1103/physreve.107.055006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2023] [Accepted: 05/05/2023] [Indexed: 06/18/2023]
Abstract
In this paper, two improvements to the theory of transition from brittle to ductile fracture developed by Langer [J. S. Langer, Phys. Rev. E 103, 063004 (2021)2470-004510.1103/PhysRevE.103.063004] are proposed. First, considering the drastic temperature rise near the crack tip, the temperature dependence of the shear modulus is included to better quantify the thermally sensitive dislocation entanglement. Second, the parameters of the improved theory are identified by the large-scale least-squares method. The comparison between the fracture toughness predicted by the theory and the values obtained in Gumbsch's experiments for tungsten at different temperatures [P. Gumbsch et al., Science 282, 1293 (1998)10.1126/science.282.5392.1293] shows good agreement.
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Affiliation(s)
- K C Le
- Division of Computational Mathematics and Engineering, Institute for Computational Science, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam
- Faculty of Civil Engineering, Ton Duc Thang University, Ho Chi Minh City 758307, Vietnam
| | - H Jeong
- Lehrstuhl für Mechanik - Materialtheorie, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - T M Tran
- Department of Mechanical Engineering, Vietnamese German University, Binh Duong 750000, Vietnam
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3
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Zoffmann V, Jørgensen R, Graue M, Biener SN, Brorsson AL, Christiansen CH, Due-Christensen M, Enggaard H, Finderup J, Haas J, Husted GR, Johansen MT, Kanne KL, Hope Kolltveit BC, Krogslund KW, Lie SS, Lindholm AO, Marqvorsen EHS, Mathiesen AS, Olesen ML, Rasmussen B, Rothmann MJ, Simonsen SM, Tackie SHS, Thisted LB, Tran TM, Weis J, Kirkevold M. Person-specific evidence has the ability to mobilize relational capacity: A four-step grounded theory developed in people with long-term health conditions. Nurs Inq 2023:e12555. [PMID: 37062853 DOI: 10.1111/nin.12555] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 03/28/2023] [Accepted: 03/31/2023] [Indexed: 04/18/2023]
Abstract
Person-specific evidence was developed as a grounded theory by analyzing 20 selected case descriptions from interventions using the guided self-determination method with people with various long-term health conditions. It explains the mechanisms of mobilizing relational capacity by including person-specific evidence in shared decision-making. Person-specific self-insight was the first step, achieved as individuals completed reflection sheets enabling them to clarify their personal values and identify actions or omissions related to self-management challenges. This step paved the way for sharing these insights and challenges in a relationship with a supportive health professional, who could then rely on person-specific evidence instead of assumptions or a narrow disease perspective for shared decision-making. Trust in the evidence encouraged the supportive health professional to transfer it to the interdisciplinary team. Person-specific evidence then enhanced the ability of team members to apply general evidence in a meaningful way. The increased openness achieved by individuals through these steps enabled them to eventually share their new self-insights in daily life with other people, decreasing loneliness they experienced in self-management. Relational capacity, the core of the theory, is mobilized in both people with long-term health conditions and healthcare professionals. Further research on person-specific evidence and relational capacity in healthcare is recommended.
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Affiliation(s)
- Vibeke Zoffmann
- The Interdisciplinary Research Unit of Women's, Children's and Families' Health, Juliane Marie Centre, Copenhagen University Hospital, Rigshospitalet, Copenhagen Ø, Denmark
- Department of Public Health, University of Copenhagen, Copenhagen K, Denmark
| | - Rikke Jørgensen
- Department of Psychiatry, Aalborg University Hospital, Aalborg, Denmark
- Department of Clinical Medicine, Faculty of Medicine, Aalborg University, Aalborg, Denmark
| | - Marit Graue
- Department of Health and Caring Sciences, Western Norway University of Applied Sciences, Bergen, Norway
| | - Sigrid Normann Biener
- Department of Public Health, University of Copenhagen, Copenhagen K, Denmark
- Survivorship Unit, Danish Cancer Society Research Center, Copenhagen, Denmark
| | - Anna Lena Brorsson
- Department of Neurobiology, Care Sciences and Society, Karolinska Institute, Stockholm, Sweden
| | - Cecilie Holm Christiansen
- The Interdisciplinary Research Unit of Women's, Children's and Families' Health, Juliane Marie Centre, Copenhagen University Hospital, Rigshospitalet, Copenhagen Ø, Denmark
| | - Mette Due-Christensen
- Florence Nightingale Faculty of Nursing and Midwifery, King's College London, London, UK
- Health Promotion Research, Steno Diabetes Center Copenhagen, Gentofte, Denmark
| | - Helle Enggaard
- Department of Psychiatry, Aalborg University Hospital, Aalborg, Denmark
- Research Unit for Child and Adolescent Psychiatry, Unit for Psychiatric Research and Clinical Nursing Research Unit, Aalborg University Hospital, Aalborg, Denmark
| | - Jeanette Finderup
- Department of Renal Medicine, Aarhus University Hospital, Aarhus, Denmark
- Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
| | - Josephine Haas
- Department of Clinical Science and Education, Karolinska Institute, Södersjukhuset, Stockholm, Sweden
- Sachs' Children and Youth Hospital, Södersjukhuset, Stockholm, Sweden
| | | | | | - Katja Lisa Kanne
- Department of Infectious Diseases Centre of Excellence for Health, Immunity, and Infectious Diseases, Copenhagen University Hospital, Rigshospitalet, Copenhagen Ø, Denmark
- Centre for Cardiac, Vascular, Pulmonary and Infectious Diseases, Rigshospitalet, University of Copenhagen, Copenhagen Ø, Denmark
| | - Beate-Christin Hope Kolltveit
- Department of Health and Caring Sciences, Western Norway University of Applied Sciences, Bergen, Norway
- Vossevangen Medical Center, Voss, Norway
| | | | - Silje S Lie
- Faculty of Health, VID Specialized University, Sandnes, Norway
| | - Anna Olinder Lindholm
- Department of Clinical Science and Education, Karolinska Institute, Södersjukhuset, Stockholm, Sweden
- Sachs' Children and Youth Hospital, Södersjukhuset, Stockholm, Sweden
| | - Emilie H S Marqvorsen
- The Interdisciplinary Research Unit of Women's, Children's and Families' Health, Juliane Marie Centre, Copenhagen University Hospital, Rigshospitalet, Copenhagen Ø, Denmark
- Department of Public Health, University of Copenhagen, Copenhagen K, Denmark
| | - Anne Sophie Mathiesen
- The Interdisciplinary Research Unit of Women's, Children's and Families' Health, Juliane Marie Centre, Copenhagen University Hospital, Rigshospitalet, Copenhagen Ø, Denmark
- Department of Endocrinology, Center for Cancer and Organ Diseases, Rigshospitalet, Copenhagen University Hospital, Copenhagen Ø, Denmark
| | - Mette Linnet Olesen
- The Interdisciplinary Research Unit of Women's, Children's and Families' Health, Juliane Marie Centre, Copenhagen University Hospital, Rigshospitalet, Copenhagen Ø, Denmark
- Department of Gynaecology, Juliane Marie Centre: Copenhagen University Hospital, Rigshospitalet, Copenhagen Ø, Denmark
| | - Bodil Rasmussen
- Department of Public Health, University of Copenhagen, Copenhagen K, Denmark
- School of Nursing and Midwifery, Centre for Quality and Patient Safety Research in the Institute for Health Transformation, Deakin University, Geelong, Victoria, Australia
| | - Mette Juel Rothmann
- Faculty of Health Sciences, University of Southern Denmark and Steno Diabetes Center, Odense M, Denmark
- Steno Diabetes Center Odense, Odense University Hospital, Odense, Denmark
| | - Susan Munch Simonsen
- Centre for Human Resources and Education, The Capital Region of Denmark, Hellerup, Denmark
| | - Sara Huld Sveinsdóttir Tackie
- The Interdisciplinary Research Unit of Women's, Children's and Families' Health, Juliane Marie Centre, Copenhagen University Hospital, Rigshospitalet, Copenhagen Ø, Denmark
| | - Lise Bjerrum Thisted
- Klinik for Senfølger efter Kraeft, Klinisk Onkologisk Afdeling og Palliative Enheder, Sjaellands Universitetshospital - Roskilde, Roskilde, Denmark
| | - Trang Minh Tran
- The Interdisciplinary Research Unit of Women's, Children's and Families' Health, Juliane Marie Centre, Copenhagen University Hospital, Rigshospitalet, Copenhagen Ø, Denmark
| | - Janne Weis
- Department of Neonatology, Juliane Marie Centre: Copenhagen University Hospital, Rigshospitalet, Copenhagen Ø, Denmark
| | - Marit Kirkevold
- Faculty of Health Sciences, Department of Nursing and Health Promotion, Oslo Metropolitan University, Oslo, Norway
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Vral A, Endesfelder D, Balázs J, Beinke C, Petrenci CC, Finot F, Garty G, Hadjiiska L, Hristova R, Ivanova I, Lee Y, Lumniczky K, Milanova M, Gil OM, Oestreicher U, Pajic J, Patrono C, Pham ND, Perletti G, Seong KM, Sommer S, Szatmári T, Testa A, Tichy A, Tran TM, Wilkins R, Port M, Abend M, Baeyens A. RENEB Inter-Laboratory Comparison 2021: The Cytokinesis-Block Micronucleus Assay. Radiat Res 2023:492244. [PMID: 37057983 DOI: 10.1667/rade-22-00201.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 02/20/2023] [Indexed: 04/15/2023]
Abstract
The goal of the RENEB inter-laboratory comparison 2021 exercise was to simulate a large-scale radiation accident involving a network of biodosimetry labs. Labs were required to perform their analyses using different biodosimetric assays in triage mode scoring and to rapidly report estimated radiation doses to the organizing institution. This article reports the results obtained with the cytokinesis-block micronucleus assay. Three test samples were exposed to blinded doses of 0, 1.2 and 3.5 Gy X-ray doses (240 kVp, 13 mA, ∼75 keV, 1 Gy/min). These doses belong to 3 triage categories of clinical relevance: a low dose category, for no exposure or exposures inferior to 1 Gy, requiring no direct treatment of subjects; a medium dose category, with doses ranging from 1 to 2 Gy, and a high dose category, after exposure to doses higher than 2 Gy, with the two latter requiring increasing medical attention. After irradiation the test samples (no. 1, no. 2 and no. 3) were sent by the organizing laboratory to 14 centers participating in the micronucleus assay exercise. Laboratories were asked to setup micronucleus cultures and to perform the micronucleus assay in triage mode, scoring 500 binucleated cells manually, or 1,000 binucleated cells in automated/semi-automated mode. One laboratory received no blood samples, but scored pictures from another lab. Based on their calibration curves, laboratories had to provide estimates of the administered doses. The accuracy of the reported dose estimates was further analyzed by the micronucleus assay lead. The micronucleus assay allowed classification of samples in the corresponding clinical triage categories (low, medium, high dose category) in 88% of cases (manual scoring, 88%; semi-automated scoring, 100%; automated scoring, 73%). Agreement between scoring laboratories, assessed by calculating the Fleiss' kappa, was excellent (100%) for semi-automated scoring, good (83%) for manual scoring and poor (53%) for fully automated scoring. Correct classification into triage scoring dose intervals (reference dose ±0.5 Gy for doses ≤2.5 Gy, or reference dose ±1 Gy for doses >2.5 Gy), recommended for triage biodosimetry, was obtained in 79% of cases (manual scoring, 73%; semi-automated scoring, 100%; automated scoring, 67%). The percentage of dose estimates whose 95% confidence intervals included the reference dose was 58% (manual scoring, 48%; semi-automated scoring, 72%; automated scoring, 60%). For the irradiated samples no. 2 and no. 3, a systematic shift towards higher dose estimations was observed. This was also noticed with the other cytogenetic assays in this intercomparison exercise. Accuracy of the rapid triage modality could be maintained when the number of manually scored cells was scaled down to 200 binucleated cells. In conclusion, the micronucleus assay, preferably performed in a semi-automated or manual scoring mode, is a reliable technique to perform rapid biodosimetry analysis in large-scale radiation emergencies.
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Affiliation(s)
- A Vral
- Faculty of Medicine and Health Sciences, Radiobiology Research Unit, Universiteit Gent, Gent, Belgium
- Bundesamt für Strahlenschutz, BfS, Oberschleissheim, Germany
| | - D Endesfelder
- Bundesamt für Strahlenschutz, BfS, Oberschleissheim, Germany
| | - J Balázs
- National Public Health Center, Department of Radiobiology and Radiohygiene, Unit of Radiation Medicine, Budapest, Hungary
| | - C Beinke
- Bundeswehr Institute of Radiobiology, Munich, Germany
| | | | - F Finot
- Genevolution, Porcheville, France
| | - G Garty
- Center for Radiological Research, Columbia University, New York, New York
| | - L Hadjiiska
- National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria
| | - R Hristova
- National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria
| | - I Ivanova
- National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria
| | - Y Lee
- Laboratory of Biological Dosimetry, National Radiation Emergency Medical Center, Korea Institute of Radiological & Medical Sciences, Seoul, Republic of Korea
| | - K Lumniczky
- National Public Health Center, Department of Radiobiology and Radiohygiene, Unit of Radiation Medicine, Budapest, Hungary
| | - M Milanova
- Department of Radiobiology, Faculty of Military Health Sciences, University of Defence, Hradec Králové, Czech Republic
| | - O Monteiro Gil
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico (IST), Universidade de Lisboa, Lisbon, Portugal
| | - U Oestreicher
- Bundesamt für Strahlenschutz, BfS, Oberschleissheim, Germany
| | - J Pajic
- Serbian Institute of Occupational Health, Belgrade, Serbia
| | - C Patrono
- Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile, Rome, Italy
| | - N D Pham
- Center Radiation technlogy & Biotechnology; Dalat Nuclear Research Institute; Dalat City, Vietnam
| | - G Perletti
- Faculty of Medicine and Health Sciences, Radiobiology Research Unit, Universiteit Gent, Gent, Belgium
| | - K M Seong
- Laboratory of Biological Dosimetry, National Radiation Emergency Medical Center, Korea Institute of Radiological & Medical Sciences, Seoul, Republic of Korea
| | - S Sommer
- Institute of Nuclear Chemistry and Technology, Warsaw, Poland
| | - T Szatmári
- National Public Health Center, Department of Radiobiology and Radiohygiene, Unit of Radiation Medicine, Budapest, Hungary
| | - A Testa
- Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile, Rome, Italy
| | - A Tichy
- Department of Radiobiology, Faculty of Military Health Sciences, University of Defence, Hradec Králové, Czech Republic
| | - T M Tran
- Center Radiation technlogy & Biotechnology; Dalat Nuclear Research Institute; Dalat City, Vietnam
| | - R Wilkins
- °Health Canada, Radiation Protection Building, Ottawa, Canada
| | - M Port
- Bundeswehr Institute of Radiobiology, Munich, Germany
| | - M Abend
- Bundeswehr Institute of Radiobiology, Munich, Germany
| | - A Baeyens
- Faculty of Medicine and Health Sciences, Radiobiology Research Unit, Universiteit Gent, Gent, Belgium
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Tran TM, Atanasova V, Tardif C, Richard-Forget F. Stilbenoids as Promising Natural Product-Based Solutions in a Race against Mycotoxigenic Fungi: A Comprehensive Review. J Agric Food Chem 2023; 71:5075-5092. [PMID: 36951872 DOI: 10.1021/acs.jafc.3c00407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Exposure to mycotoxins can pose a variety of adverse health effects to mammals. Despite dozens of mycotoxin decontamination strategies applied from pre- to postharvest stages, it is always challenging to guarantee a safe level of these natural toxic compounds in food and feedstuffs. In the context of the increased occurrence of drug-resistance strains of mycotoxin-producing fungi driven by the overuse of fungicides, the search for new natural-product-based solutions is a top priority. This review aims to shed a light on the promising potential of stilbenoids extracted from renewable agricultural wastes (e.g., grape canes and forestry byproducts) as antimycotoxin agents. Deeper insights into the mode of actions underlying the bioactivity of stilbenoid molecules against fungal pathogens, together with their roles in plant defense responses, are provided. Safety aspects of these natural compounds on humans and ecology are discussed. Perspectives on the development of stilbenoid-based formulations using encapsulation technology, which allows the bypassing of the limitations related to stilbenoids, particularly low aqueous solubility, are addressed. Optimistically, the knowledge gathered in the present review supports the use of currently underrated agricultural byproducts to produce stilbenoid-abundant extracts with a high efficiency in the mitigation of mycotoxins in food and feedstuffs.
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Affiliation(s)
- Trang Minh Tran
- RU 1264 Mycology and Food Safety (MycSA), INRAE, 33882 Villenave d'Ornon, France
| | - Vessela Atanasova
- RU 1264 Mycology and Food Safety (MycSA), INRAE, 33882 Villenave d'Ornon, France
| | - Charles Tardif
- UFR Sciences Pharmaceutiques, INRAE, Bordeaux INP, UR OENOLOGIE, EA 4577, USC 1366, ISVV, Univ. Bordeaux, 33882 Villenave d'Ornon, France
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Endesfelder D, Oestreicher U, Bucher M, Beinke C, Siebenwirth C, Ainsbury E, Moquet J, Gruel G, Gregoire E, Martinez JS, Vral A, Baeyens A, Valente M, Montoro A, Terzoudi G, Triantopoulou S, Pantelias A, Gil OM, Prieto MJ, Domene MM, Zafiropoulos D, Barquinero JF, Pujol-Canadell M, Lumniczky K, Hargitai R, Kis E, Testa A, Patrono C, Sommer S, Hristova R, Kostova N, Atanasova M, Sevriukova O, Domínguez I, Pastor N, Güçlü I, Pajic J, Sabatier L, Brochard P, Tichy A, Milanova M, Finot F, Petrenci CC, Wilkins RC, Beaton-Green LA, Seong KM, Lee Y, Lee YH, Balajee AS, Maznyk N, Sypko T, Pham ND, Tran TM, Miura T, Suto Y, Akiyamam M, Tsuyama N, Abe Y, Goh VST, Chua CEL, Abend M, Port M. RENEB Inter-Laboratory Comparison 2021: The Dicentric Chromosome Assay. Radiat Res 2023:492028. [PMID: 37018160 DOI: 10.1667/rade-22-00202.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Accepted: 02/03/2023] [Indexed: 04/06/2023]
Abstract
After large-scale radiation accidents where many individuals are suspected to be exposed to ionizing radiation, biological and physical retrospective dosimetry assays are important tools to aid clinical decision making by categorizing individuals into unexposed/minimally, moderately or highly exposed groups. Quality-controlled inter-laboratory comparisons of simulated accident scenarios are regularly performed in the frame of the European legal association RENEB (Running the European Network of Biological and Physical retrospective Dosimetry) to optimize international networking and emergency readiness in case of large-scale radiation events. In total 33 laboratories from 22 countries around the world participated in the current RENEB inter-laboratory comparison 2021 for the dicentric chromosome assay. Blood was irradiated in vitro with X rays (240 kVp, 13 mA, ∼75 keV, 1 Gy/min) to simulate an acute, homogeneous whole-body exposure. Three blood samples (no. 1: 0 Gy, no. 2: 1.2 Gy, no. 3: 3.5 Gy) were sent to each participant and the task was to culture samples, to prepare slides and to assess radiation doses based on the observed dicentric yields from 50 manually or 150 semi-automatically scored metaphases (triage mode scoring). Approximately two-thirds of the participants applied calibration curves from irradiations with γ rays and about 1/3 from irradiations with X rays with varying energies. The categorization of the samples in clinically relevant groups corresponding to individuals that were unexposed/minimally (0-1 Gy), moderately (1-2 Gy) or highly exposed (>2 Gy) was successfully performed by all participants for sample no. 1 and no. 3 and by ≥74% for sample no. 2. However, while most participants estimated a dose of exactly 0 Gy for the sham-irradiated sample, the precise dose estimates of the samples irradiated with doses >0 Gy were systematically higher than the corresponding reference doses and showed a median deviation of 0.5 Gy (sample no. 2) and 0.95 Gy (sample no. 3) for manual scoring. By converting doses estimated based on γ-ray calibration curves to X-ray doses of a comparable mean photon energy as used in this exercise, the median deviation decreased to 0.27 Gy (sample no. 2) and 0.6 Gy (sample no. 3). The main aim of biological dosimetry in the case of a large-scale event is the categorization of individuals into clinically relevant groups, to aid clinical decision making. This task was successfully performed by all participants for the 0 Gy and 3.5 Gy samples and by 74% (manual scoring) and 80% (semi-automatic scoring) for the 1.2 Gy sample. Due to the accuracy of the dicentric chromosome assay and the high number of participating laboratories, a systematic shift of the dose estimates could be revealed. Differences in radiation quality (X ray vs. γ ray) between the test samples and the applied dose effect curves can partly explain the systematic shift. There might be several additional reasons for the observed bias (e.g., donor effects, transport, experimental conditions or the irradiation setup) and the analysis of these reasons provides great opportunities for future research. The participation of laboratories from countries around the world gave the opportunity to compare the results on an international level.
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Affiliation(s)
- D Endesfelder
- Bundesamt für Strahlenschutz, BfS, Oberschleissheim, Germany
| | - U Oestreicher
- Bundesamt für Strahlenschutz, BfS, Oberschleissheim, Germany
| | - M Bucher
- Bundesamt für Strahlenschutz, BfS, Oberschleissheim, Germany
| | - C Beinke
- Bundeswehr Institute of Radiobiology, Munich, Germany
| | - C Siebenwirth
- Bundeswehr Institute of Radiobiology, Munich, Germany
| | - E Ainsbury
- UK Health Security Agency, Radiation, Chemicals and Environmental Hazards Directorate, Chilton, Oxfordshire, United Kingdom
| | - J Moquet
- UK Health Security Agency, Radiation, Chemicals and Environmental Hazards Directorate, Chilton, Oxfordshire, United Kingdom
| | - G Gruel
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-Santé, SERAMED, LRAcc Fontenay-aux-Roses 92262, France
| | - E Gregoire
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-Santé, SERAMED, LRAcc Fontenay-aux-Roses 92262, France
| | - J S Martinez
- Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSE-Santé, SERAMED, LRAcc Fontenay-aux-Roses 92262, France
| | - A Vral
- Faculty of Medicine and Health Sciences, Universiteit Gent, Gent, Belgium
| | - A Baeyens
- Faculty of Medicine and Health Sciences, Universiteit Gent, Gent, Belgium
| | - M Valente
- Armed Forces Biomedical Research Institute, Department of Radiation Biological, Effects Brétigny-sur-Orge, France
| | - A Montoro
- Laboratorio de Dosimetría Biológica Servicio de Protección Radiológica Hospital Universitario Politécnico la Fe, Spain
| | - G Terzoudi
- National Centre for Scientific Research "Demokritos," Health Physics, Radiobiology & Cytogenetics Laboratory, Athens, Greece
| | - S Triantopoulou
- National Centre for Scientific Research "Demokritos," Health Physics, Radiobiology & Cytogenetics Laboratory, Athens, Greece
| | - A Pantelias
- National Centre for Scientific Research "Demokritos," Health Physics, Radiobiology & Cytogenetics Laboratory, Athens, Greece
| | - O Monteiro Gil
- Centro de Ciências e Tecnologias Nucleares, Instituto Superior Técnico (IST), Universidade de Lisboa, Lisboa, Portugal
| | - M J Prieto
- Hospital General Universitario Gregorio Marañón; Servicio de Oncología Radioterápica; Laboratorio de dosimetría biológica, Madrid, Spain
| | - M M Domene
- Hospital General Universitario Gregorio Marañón; Servicio de Oncología Radioterápica; Laboratorio de dosimetría biológica, Madrid, Spain
| | - D Zafiropoulos
- Laboratori Nazionali di Legnaro - Istituto Nazionale di Fisica Nucleare, Legnaro, Italy
| | | | | | - K Lumniczky
- Radiation Medicine Unit, Department of Radiobiology and Radiohygiene, National Public Health Centre, Budapest, Hungary
| | - R Hargitai
- Radiation Medicine Unit, Department of Radiobiology and Radiohygiene, National Public Health Centre, Budapest, Hungary
| | - E Kis
- Radiation Medicine Unit, Department of Radiobiology and Radiohygiene, National Public Health Centre, Budapest, Hungary
| | - A Testa
- Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile, Rome, Italy
| | - C Patrono
- Agenzia nazionale per le nuove tecnologie, l'energia e lo sviluppo economico sostenibile, Rome, Italy
| | - S Sommer
- Institute of Nuclear Chemistry and Technology, Warsaw, Poland
| | - R Hristova
- National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria
| | - N Kostova
- National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria
| | - M Atanasova
- National Centre of Radiobiology and Radiation Protection, Sofia, Bulgaria
| | - O Sevriukova
- Laboratori Nazionali di Legnaro - Istituto Nazionale di Fisica Nucleare, Legnaro, Italy
| | - I Domínguez
- Universidad de Sevilla, Departamento de Biología Celular, Facultad de Biología, Sevilla, Spain
| | - N Pastor
- Universidad de Sevilla, Departamento de Biología Celular, Facultad de Biología, Sevilla, Spain
| | - I Güçlü
- Nükleer Arş Ens. Yarımburgaz mah. Nükleer Arş yolu, Turkey
| | - J Pajic
- Serbian Institute of Occupational Health, Belgrade, Serbia
| | - L Sabatier
- PROCyTOX, Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), Fontenay-aux-Roses, France and Université Paris-Saclay, France
| | - P Brochard
- PROCyTOX, Commissariat à l'Energie Atomique et aux Energies Alternatives (CEA), Fontenay-aux-Roses, France and Université Paris-Saclay, France
| | - A Tichy
- Department of Radiobiology, Faculty of Military Health Sciences, University of Defence, Hradec Králové, Czech Republic
| | - M Milanova
- Department of Radiobiology, Faculty of Military Health Sciences, University of Defence, Hradec Králové, Czech Republic
| | - F Finot
- Genevolution, Porcheville, France
| | | | - R C Wilkins
- Consumer and Clinical Radiation Protection Bureau, Health Canada, Ottawa, Canada
| | - L A Beaton-Green
- Consumer and Clinical Radiation Protection Bureau, Health Canada, Ottawa, Canada
| | - K M Seong
- Lab of Biological Dosimetry, National Radiation Emergency Medical Center, Korea Institute of Radiological & Medical Sciences, Seoul, Republic of Korea
| | - Y Lee
- Lab of Biological Dosimetry, National Radiation Emergency Medical Center, Korea Institute of Radiological & Medical Sciences, Seoul, Republic of Korea
| | - Y H Lee
- Lab of Biological Dosimetry, National Radiation Emergency Medical Center, Korea Institute of Radiological & Medical Sciences, Seoul, Republic of Korea
| | - A S Balajee
- Cytogenetic Biodosimetry Laboratory; Radiation Emergency Assistance Center/Training Site (REAC/TS); Oak Ridge Institute for Science and Education; Oak Ridge Associated Universities; Oak Ridge, Tennessee
| | - N Maznyk
- aa Radiation Cytogenetics Laboratory; S.P. Grigoriev Institute for Medical Radiology and Oncology of Ukrainian National Academy of Medical Science, Kharkiv, Ukraine
| | - T Sypko
- aa Radiation Cytogenetics Laboratory; S.P. Grigoriev Institute for Medical Radiology and Oncology of Ukrainian National Academy of Medical Science, Kharkiv, Ukraine
| | - N D Pham
- bb Biodosimetry Laboratory, Center for Radiation Technology & Biotechnology; Dalat Nuclear Research Institute; Dalat City, Vietnam
| | - T M Tran
- bb Biodosimetry Laboratory, Center for Radiation Technology & Biotechnology; Dalat Nuclear Research Institute; Dalat City, Vietnam
| | - T Miura
- cc Department of Risk Analysis and Biodosimetry Institute of Radiation Emergency Medicine, Hirosaki University, Hirosaki, Japan
| | - Y Suto
- dd National Institutes for Quantum Science and Technology, Chiba, Japan
| | - M Akiyamam
- dd National Institutes for Quantum Science and Technology, Chiba, Japan
| | - N Tsuyama
- ee Department of Radiation Life Sciences, Fukushima Medical University School of Medicine, Fukushima, Japan
| | - Y Abe
- ff Department of Radiation Biology and Protection, Atomic Bomb Disease Institute, Nagasaki University, Japan
| | - V S T Goh
- ff Department of Radiation Biology and Protection, Atomic Bomb Disease Institute, Nagasaki University, Japan
| | - C E L Chua
- gg Department of Radiobiology, Singapore Nuclear Research and Safety Initiative (SNRSI), National University of Singapore, Singapore
| | - M Abend
- Bundeswehr Institute of Radiobiology, Munich, Germany
| | - M Port
- Bundeswehr Institute of Radiobiology, Munich, Germany
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7
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Mouton A, Plonka A, Fabre R, Tran TM, Robert P, Macoir J, Manera V, Gros A. The course of primary progressive aphasia diagnosis: a cross-sectional study. Alzheimers Res Ther 2022; 14:64. [PMID: 35538502 PMCID: PMC9092839 DOI: 10.1186/s13195-022-01007-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2021] [Accepted: 04/19/2022] [Indexed: 11/23/2022]
Abstract
Background The primary progressive aphasia (PPA) diagnosis trajectory is debated, as several changes in diagnosis occur during PPA course, due to phenotype evolution from isolated language alterations to global cognitive impairment. The goal of the present study, based on a French cohort, was to describe the demographics and the evolution of subjects with (PPA) in comparison with Alzheimer’s disease (AD) on a period of 7 years. Methods We conducted a repeated cross-sectional study. The study population comprised individuals with PPA and AD diagnosis (N=167,191) from 2010 to 2016 in the French National data Bank (BNA). Demographic variables, MMSE scores, diagnosis status at each visit and prescribed treatments were considered. Results From 2010 to 2016, 5186 patients were initially diagnosed with PPA, 162,005 with AD. Compared to AD subjects, significant differences were found concerning age (younger at first diagnosis for PPA), gender (more balanced in PPA), education level (higher in PPA) and MMSE score (higher of 1 point in PPA). Percentage of pending diagnosis, delay between first consultation and first diagnosis and the number of different diagnoses before the diagnosis of interest were significantly higher in PPA group compared to AD group. Pharmacological and non-pharmacological treatments were significatively more recommended following PPA than AD diagnosis. Conclusion This study improves the knowledge of PPA epidemiology and has the potential to help adopting appropriate public health service policies. It supports the hypothesis that PPA is diagnosed later than AD. The PPA diagnosis increases the prescription of non-pharmacological treatments, especially speech and language therapy (SLT) that is the main treatment available and most effective when at the initial stage. Trial registration ClinicalTrials.gov identifier NCT03687112 Supplementary Information The online version contains supplementary material available at 10.1186/s13195-022-01007-6.
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Affiliation(s)
- A Mouton
- Centre Hospitalier Universitaire de Nice, Laboratoire CoBTeK, Service Clinique Gériatrique du Cerveau et du Mouvement, Université Côte d'Azur, Nice, France
| | - A Plonka
- Centre Hospitalier Universitaire de Nice, Laboratoire CoBTeK, Service Clinique Gériatrique du Cerveau et du Mouvement, Université Côte d'Azur, Nice, France.,Institut NeuroMod, Université Côte d'Azur, Sophia Antipolis, France
| | - R Fabre
- Centre Hospitalier Universitaire de Nice, Laboratoire CoBTeK, Service Clinique Gériatrique du Cerveau et du Mouvement, Université Côte d'Azur, Nice, France
| | - T M Tran
- Laboratoire STL, UMR 8163, Université de Lille, Lille, France
| | - P Robert
- Centre Hospitalier Universitaire de Nice, Laboratoire CoBTeK, Service Clinique Gériatrique du Cerveau et du Mouvement, Université Côte d'Azur, Nice, France.,Faculté de Médecine de Nice, Département d'Orthophonie, Université Côte d'Azur, Nice, France
| | - J Macoir
- Department of rehabilitation, Faculty of Medicine, Laval University, Quebec, Canada.,CERVO Brain Research Center, Quebec, QC, Canada
| | - V Manera
- Faculté de Médecine de Nice, Département d'Orthophonie, Université Côte d'Azur, Nice, France.,Laboratoire CoBTeK, Université Côte d'Azur, Nice, France
| | - A Gros
- Centre Hospitalier Universitaire de Nice, Laboratoire CoBTeK, Service Clinique Gériatrique du Cerveau et du Mouvement, Université Côte d'Azur, Nice, France. .,Faculté de Médecine de Nice, Département d'Orthophonie, Université Côte d'Azur, Nice, France.
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8
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Tran TM, Ameye M, Devlieghere F, De Saeger S, Eeckhout M, Audenaert K. Streptomyces Strains Promote Plant Growth and Induce Resistance Against Fusarium verticillioides via Transient Regulation of Auxin Signaling and Archetypal Defense Pathways in Maize Plants. Front Plant Sci 2021; 12:755733. [PMID: 34899781 PMCID: PMC8655691 DOI: 10.3389/fpls.2021.755733] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Accepted: 11/01/2021] [Indexed: 06/14/2023]
Abstract
Driven by climate change, Fusarium ear rot (FER) caused by Fusarium verticillioides occurs frequently in maize worldwide. In parallel, legislative regulations and increasing environmental awareness have spurred research on alternative FER biocontrol strategies. A promising group of bacterial control agents is Streptomyces species due to their metabolic versatility. However, insights into the molecular modes of action of these biocontrol agents are often lacking. This study aims at unraveling the biocontrol efficacy of Streptomyces rhizobacterial strains against F. verticillioides. We first assessed the direct antagonism of four Streptomyces strains ST02, ST03, ST07, and ST08. Then, a profile of 16 genes associated with intrinsic plant defense signaling was assessed in maize plants. Both in vitro and in vivo data showed that the biocontrol strain ST03 perfectly suppressed the growth of F. verticillioides. High inhibition efficacy was also observed for extracellular compounds in the supernatant secreted by this strain. Especially, for maize cobs, the biocontrol strain ST03 not only inhibited the proliferation of F. verticillioides but also significantly repressed fungal fumonisin production 7 days after inoculation. On maize plants, the direct antagonism was confirmed by a significant reduction of the fungal DNA level in soils when co-applied with F. verticillioides and strain ST03. In terms of its action on plants, strain ST03 induced downregulation of auxin responsive genes (AUX1, ARF1, and ARF2) and gibberellic acid (GA)-related gene AN1 even in the absence of F. verticillioides at early time points. In leaves, the biocontrol strain induced the expression of genes related to salicylic acid (SA), and 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one (DIMBOA)-mediated pathways, and pathogenesis-related proteins in the presence or absence of the pathogen. Interestingly, the biocontrol strain significantly promoted plant growth even in the presence of F. verticillioides. All of which demonstrated that the Streptomyces strain ST03 is a promising FER biocontrol and a growth-promoting candidate.
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Affiliation(s)
- Trang Minh Tran
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty Bioscience Engineering, Ghent University, Ghent, Belgium
- Laboratory of Applied Mycology, Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Maarten Ameye
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Frank Devlieghere
- Research Unit Food Microbiology and Food Preservation, Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Sarah De Saeger
- Center of Excellence in Mycotoxicology and Public Health, Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Mia Eeckhout
- Laboratory of Applied Mycology, Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
- Research Unit of Cereal and Feed Technology, Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Kris Audenaert
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty Bioscience Engineering, Ghent University, Ghent, Belgium
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Tran TM, Ameye M, Landschoot S, Devlieghere F, De Saeger S, Eeckhout M, Audenaert K. Molecular Insights into Defense Responses of Vietnamese Maize Varieties to Fusarium verticillioides Isolates. J Fungi (Basel) 2021; 7:jof7090724. [PMID: 34575762 PMCID: PMC8469167 DOI: 10.3390/jof7090724] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 08/30/2021] [Accepted: 09/01/2021] [Indexed: 12/21/2022] Open
Abstract
Fusarium ear rot (FER) caused by Fusarium verticillioides is one of the main fungal diseases in maize worldwide. To develop a pathogen-tailored FER resistant maize line for local implementation, insights into the virulence variability of a residing F. verticillioides population are crucial for developing customized maize varieties, but remain unexplored. Moreover, little information is currently available on the involvement of the archetypal defense pathways in the F. verticillioides-maize interaction using local isolates and germplasm, respectively. Therefore, this study aims to fill these knowledge gaps. We used a collection of 12 F. verticillioides isolates randomly gathered from diseased maize fields in the Vietnamese central highlands. To assess the plant's defense responses against the pathogens, two of the most important maize hybrid genotypes grown in this agro-ecological zone, lines CP888 and Bt/GT NK7328, were used. Based on two assays, a germination and an in-planta assay, we found that line CP888 was more susceptible to the F. verticillioides isolates when compared to line Bt/GT NK7328. Using the most aggressive isolate, we monitored disease severity and gene expression profiles related to biosynthesis pathways of salicylic acid (SA), jasmonic acid (JA), abscisic acid (ABA), benzoxazinoids (BXs), and pathogenesis-related proteins (PRs). As a result, a stronger induction of SA, JA, ABA, BXs, and PRs synthesizing genes might be linked to the higher resistance of line Bt/GT NK7328 compared to the susceptible line CP888. All these findings could supply valuable knowledge in the selection of suitable FER resistant lines against the local F. verticllioides population and in the development of new FER resistant germplasms.
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Affiliation(s)
- Trang Minh Tran
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty Bioscience Engineering, Ghent University, 9000 Ghent, Belgium; (M.A.); (S.L.)
- Laboratory of Applied Mycology, Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium;
- Correspondence: (T.M.T.); (K.A.)
| | - Maarten Ameye
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty Bioscience Engineering, Ghent University, 9000 Ghent, Belgium; (M.A.); (S.L.)
| | - Sofie Landschoot
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty Bioscience Engineering, Ghent University, 9000 Ghent, Belgium; (M.A.); (S.L.)
| | - Frank Devlieghere
- Research Unit Food Microbiology and Food Preservation, Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium;
| | - Sarah De Saeger
- Center of Excellence in Mycotoxicology and Public Health, Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, 9000 Ghent, Belgium;
| | - Mia Eeckhout
- Laboratory of Applied Mycology, Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium;
- Research Unit of Cereal and Feed Technology, Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium
| | - Kris Audenaert
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty Bioscience Engineering, Ghent University, 9000 Ghent, Belgium; (M.A.); (S.L.)
- Correspondence: (T.M.T.); (K.A.)
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Phan LTK, Tran TM, Audenaert K, Jacxsens L, Eeckhout M. Contamination of Fusarium proliferatum and Aspergillus flavus in the Rice Chain Linked to Crop Seasons, Cultivation Regions, and Traditional Agricultural Practices in Mekong Delta, Vietnam. Foods 2021; 10:foods10092064. [PMID: 34574173 PMCID: PMC8468470 DOI: 10.3390/foods10092064] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 08/23/2021] [Accepted: 08/26/2021] [Indexed: 11/16/2022] Open
Abstract
This study evaluates the influence of crop seasons, cultivation regions, and traditional agricultural practices on the occurrence of F. proliferatum and A. flavus in the rice chain in the Mekong Delta, Vietnam. A survey on pre- and post-harvest practices was performed from 2017 to 2019 in parallel with sampling. Results showed that F. proliferatum (36.3%) and A. flavus (10%) were predominantly present throughout the rice chain. These fungi frequently occurred in winter–spring and autumn–winter crops in Can Tho paddy. Especially, F. proliferatum appeared both on the field and during transportation (50–100%), while A. flavus presented at all stages (10–33%). The occurrence of F. proliferatum reduced 70–27% after drying, depended on the seasons, compared to field and transportation stages and could not be detected anymore at further stages. Applying poor pre-harvest agricultural practices such as the use of certain varieties (Jasmine, DT8 varieties), combination of fertilizers (organic–inorganic), fields with crop debris, unhygienic boats, and delayed drying time of 8–12 h or 12–28 h resulted in an increase in fungal contamination on paddy. This study provides a detailed description of fungi contamination in crop seasons, cultivation regions, and agricultural practices, which may help in understanding the fungal dynamic and allow identification of good agricultural practices to mitigate the fungal contamination and potential mycotoxin production.
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Affiliation(s)
- Lien Thi Kim Phan
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium; (T.M.T.); (L.J.); (M.E.)
- Faculty of Food Science Technology, Ho Chi Minh city University of Food Industry, 140 Le Trong Tan Street, Tay Thanh Ward, Tan Phu District, Ho Chi Minh City 700000, Vietnam
- Correspondence: ; Tel.: +32-465509287
| | - Trang Minh Tran
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium; (T.M.T.); (L.J.); (M.E.)
| | - Kris Audenaert
- Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Valentin Vaerwyck Weg 1, 9000 Gent, Belgium;
| | - Liesbeth Jacxsens
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium; (T.M.T.); (L.J.); (M.E.)
| | - Mia Eeckhout
- Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, 9000 Ghent, Belgium; (T.M.T.); (L.J.); (M.E.)
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11
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Tan J, De Zutter N, De Saeger S, De Boevre M, Tran TM, van der Lee T, Waalwijk C, Willems A, Vandamme P, Ameye M, Audenaert K. Presence of the Weakly Pathogenic Fusarium poae in the Fusarium Head Blight Disease Complex Hampers Biocontrol and Chemical Control of the Virulent Fusarium graminearum Pathogen. Front Plant Sci 2021; 12:641890. [PMID: 33679858 PMCID: PMC7928387 DOI: 10.3389/fpls.2021.641890] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Accepted: 01/28/2021] [Indexed: 06/12/2023]
Abstract
Fusarium head blight (FHB) in wheat (Triticum aestivum L.) is caused by a consortium of mutually interacting Fusarium species. In the field, the weakly pathogenic F. poae often thrives on the infection sites of the virulent F. graminearum. In this ecological context, we investigated the efficacy of chemical and biocontrol agents against F. graminearum in wheat ears. For this purpose, one fungicide comprising prothioconazole + spiroxamine and two bacterial biocontrol strains, Streptomyces rimosus LMG 19352 and Rhodococcus sp. R-43120 were tested for their efficacy to reduce FHB symptoms and mycotoxin (deoxynivalenol, DON) production by F. graminearum in presence or absence of F. poae. Results showed that the fungicide and both actinobacterial strains reduced FHB symptoms and concomitant DON levels in wheat ears inoculated with F. graminearum. Where Streptomyces rimosus appeared to have direct antagonistic effects, Rhodococcus and the fungicide mediated suppression of F. graminearum was linked to the archetypal salicylic acid and jasmonic acid defense pathways that involve the activation of LOX1, LOX2 and ICS. Remarkably, this chemical- and biocontrol efficacy was significantly reduced when F. poae was co-inoculated with F. graminearum. This reduced efficacy was linked to a suppression of the plant's intrinsic defense system and increased levels of DON. In conclusion, our study shows that control strategies against the virulent F. graminearum in the disease complex causing FHB are hampered by the presence of the weakly pathogenic F. poae. This study provides generic insights in the complexity of control strategies against plant diseases caused by multiple pathogens.
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Affiliation(s)
- Jiang Tan
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Noémie De Zutter
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Sarah De Saeger
- Centre of Excellence in Mycotoxicology and Public Health, Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Marthe De Boevre
- Centre of Excellence in Mycotoxicology and Public Health, Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Ghent, Belgium
| | - Trang Minh Tran
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Theo van der Lee
- Business Unit Biointeractions and Plant Health, Wageningen University and Research, Wageningen, Netherlands
| | - Cees Waalwijk
- Business Unit Biointeractions and Plant Health, Wageningen University and Research, Wageningen, Netherlands
| | - Anne Willems
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Peter Vandamme
- Laboratory of Microbiology, Department of Biochemistry and Microbiology, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Maarten Ameye
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Kris Audenaert
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
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12
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Tran TM, Ameye M, Phan LTK, Devlieghere F, De Saeger S, Eeckhout M, Audenaert K. Post-harvest contamination of maize by Fusarium verticillioides and fumonisins linked to traditional harvest and post-harvest practices: A case study of small-holder farms in Vietnam. Int J Food Microbiol 2020; 339:109022. [PMID: 33340942 DOI: 10.1016/j.ijfoodmicro.2020.109022] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 08/11/2020] [Revised: 12/01/2020] [Accepted: 12/04/2020] [Indexed: 11/29/2022]
Abstract
Together with conducive climatic factors, poor pre-harvest practices of ethnic small-holder farmers are a major cause of the contamination of maize by Fusarium verticillioides and fumonisins. The proliferation of this field pathogen and the accumulation of its mycotoxins in post-harvest maize caused by ethnic post-harvest practices of subsistence farms have received little attention. Therefore, this study aimed to evaluate the impact of traditional harvest and post-harvest practices on the proliferation of F. verticillioides and fumonisins contamination in post-harvest maize of two ethnic groups: Ede and Kinh from the central highlands of Vietnam. In parallel with analysis, a survey on harvest and post-harvest practices of these farmers was conducted from late December 2017 to early January 2019. As a result, four effective post-harvest practices at mitigating the contamination were defined: (1) removal of damaged cobs at harvest, (2) transport of maize home after harvest, (3) shelling maize away from fields, and (4) drying maize on cement yards. These practices were better implemented by Kinh households than Ede households reducing the post-harvest contamination of maize with F. verticillioides and fumonisin B1 (FB1), FB2, and FB3. Nevertheless, there is still room for improvement with respect to inadequate open-air drying method, poor storage infrastructure, and poor moisture content management as these correlated to the proliferation of F. verticillioides. Finally, the presence of fumonisins together with aflatoxins in some samples at the storage phase might cause a severe impact on human health.
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Affiliation(s)
- Trang Minh Tran
- Laboratory of Applied Mycology, Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium; Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium.
| | - Maarten Ameye
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium.
| | - Lien Thi-Kim Phan
- Department of Food Science and Nutrition, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium.
| | - Frank Devlieghere
- Research Unit Food Microbiology and Food Preservation, Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium.
| | - Sarah De Saeger
- Center of Excellence in Mycotoxicology and Public Health, Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, 9000 Ghent, Belgium.
| | - Mia Eeckhout
- Laboratory of Applied Mycology, Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium; Research Unit of Cereal and Feed Technology, Department of Food Technology, Safety and Health, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium.
| | - Kris Audenaert
- Laboratory of Applied Mycology and Phenomics, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, 9000 Ghent, Belgium.
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Rumpel C, Ann V, Bahri H, Calabi Floody M, Cheik S, Doan TT, Harit A, Janeau JL, Jouquet P, Mora ML, Podwojewski P, Tran TM, Ngo QA, Rossi PL, Sanaullah M. Research for development in the 21st century. Geoderma 2020; 378:114558. [PMID: 32836329 DOI: 10.1016/j.geoderma.2020.114588] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Affiliation(s)
- C Rumpel
- CNRS, IRD, Institute of Ecology and Environmental Sciences - Paris, UMR (CNRS, IRD, INRA, Sorbonne University, UPEC), Paris, France
| | - V Ann
- Institute of Technology of Cambodia, Phnom Penh, Cambodia
| | - H Bahri
- Institut National de Recherches en Génie Rural, Eaux et Forêts, Université de Carthage, Tunisia
| | | | - S Cheik
- Gachamaleh, lot 18, 1095 Djibouti, Djibouti
| | - T T Doan
- Soils and Fertilizers Research Institute, Hanoi, Viet Nam
| | - A Harit
- School of Environmental Sciences, Mahatma Gandhi University, Kottayam, India
| | - J L Janeau
- CNRS, IRD, Institute of Ecology and Environmental Sciences - Paris, UMR (CNRS, IRD, INRA, Sorbonne University, UPEC), Paris, France
| | - P Jouquet
- CNRS, IRD, Institute of Ecology and Environmental Sciences - Paris, UMR (CNRS, IRD, INRA, Sorbonne University, UPEC), Paris, France
| | | | - P Podwojewski
- CNRS, IRD, Institute of Ecology and Environmental Sciences - Paris, UMR (CNRS, IRD, INRA, Sorbonne University, UPEC), Paris, France
| | - T M Tran
- Soils and Fertilizers Research Institute, Hanoi, Viet Nam
| | - Q A Ngo
- Institute of Chemistry, VAST, Hanoi, Viet Nam
| | - P L Rossi
- CNRS, IRD, Institute of Ecology and Environmental Sciences - Paris, UMR (CNRS, IRD, INRA, Sorbonne University, UPEC), Paris, France
| | - M Sanaullah
- Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan
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14
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Rumpel C, Ann V, Bahri H, Calabi Floody M, Cheik S, Doan TT, Harit A, Janeau JL, Jouquet P, Mora ML, Podwojewski P, Tran TM, Ngo QA, Rossi PL, Sanaullah M. Research for development in the 21st century. Geoderma 2020; 378:114558. [PMID: 32836329 PMCID: PMC7387271 DOI: 10.1016/j.geoderma.2020.114558] [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] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Affiliation(s)
- C Rumpel
- CNRS, IRD, Institute of Ecology and Environmental Sciences - Paris, UMR (CNRS, IRD, INRA, Sorbonne University, UPEC), Paris, France
| | - V Ann
- Institute of Technology of Cambodia, Phnom Penh, Cambodia
| | - H Bahri
- Institut National de Recherches en Génie Rural, Eaux et Forêts, Université de Carthage, Tunisia
| | | | - S Cheik
- Gachamaleh, lot 18, 1095 Djibouti, Djibouti
| | - T T Doan
- Soils and Fertilizers Research Institute, Hanoi, Viet Nam
| | - A Harit
- School of Environmental Sciences, Mahatma Gandhi University, Kottayam, India
| | - J L Janeau
- CNRS, IRD, Institute of Ecology and Environmental Sciences - Paris, UMR (CNRS, IRD, INRA, Sorbonne University, UPEC), Paris, France
| | - P Jouquet
- CNRS, IRD, Institute of Ecology and Environmental Sciences - Paris, UMR (CNRS, IRD, INRA, Sorbonne University, UPEC), Paris, France
| | | | - P Podwojewski
- CNRS, IRD, Institute of Ecology and Environmental Sciences - Paris, UMR (CNRS, IRD, INRA, Sorbonne University, UPEC), Paris, France
| | - T M Tran
- Soils and Fertilizers Research Institute, Hanoi, Viet Nam
| | - Q A Ngo
- Institute of Chemistry, VAST, Hanoi, Viet Nam
| | - P L Rossi
- CNRS, IRD, Institute of Ecology and Environmental Sciences - Paris, UMR (CNRS, IRD, INRA, Sorbonne University, UPEC), Paris, France
| | - M Sanaullah
- Institute of Soil and Environmental Sciences, University of Agriculture, Faisalabad, Pakistan
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15
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Niaré DS, Doumtabe D, Ongoiba A, Sidibé K, Traoré A, Sangala J, Kayentao K, Tran TM, Crompton PD, Traoré B, Doumbo OK. [Dynamics of Egg Excretion of Schistosoma haematobium in a Longitudinal Cohort Under Treatment with Praziquantel over a Five-Year Period in Kalifabougou, Mali]. ACTA ACUST UNITED AC 2019; 111:114-120. [PMID: 30789237 DOI: 10.3166/bspe-2018-0018] [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: 09/04/2017] [Accepted: 02/27/2018] [Indexed: 11/20/2022]
Abstract
This study aim was to evaluate the dynamics of Schistosoma haematobium eggs excretion after the scaling up of "Mass Drug Administration" (MDA) with praziquantel (PZQ) from 2011 to 2016 in a cohort of volunteers living in the village of Kalifabougou, Mali. We conducted a cross-sectional study on 676 volunteers in May 2011 niched in cohort study from 696 volunteers aged three months to 25 years. The eggs of Schistosoma haematobium (Sh) were tested by urine filtration technique, Soil-transmitted helminth and Schistosoma mansoni by the Kato-Katz technique. Maximal MDA/ PZQ population coverage was 83% in 2015 and no MDA/PZQ n 2014. A total of 676 volunteers was included in this prospective cohort. The prevalence rate of Sh showed a significate decreasing from 2011, 2013 to 2014 with respectively 10.2% [95% CI=10.04-10,18], 5.32% [95% CI=5.30-5.33], and 5.25% [95% CI=524.-5.31], followed by an increase to 10.6% [95% CI = 10.47-10.63] in 2015 and a significative decrease in 2016 to 5.4% [95% CI=3.5-7,3]. Children aged from six to 10 years and mostly boys were more infected with Sh, then could serve of parasite reservoir. MDA with PZQ remains an effective strategy for schistosomiasis control against Sh in Kalifabougou. Additional studies on MDA/PZQ average treatment covering human-water contact behaviors and population migration are necessary to understand the persistence of the 5% annual prevalence rate of egg shedding in the cohort of volunteers periodically treated with PQZ. Testing eggs shed viability will be also an added value.
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Affiliation(s)
- D Safiatou Niaré
- Malaria Research and Training Center/Département d'Epidémiologie des Affections Parasitaires, LIG-MRTC-ICER, FMPOS-FAPH, USTTB, Mali
| | - D Doumtabe
- Malaria Research and Training Center/Département d'Epidémiologie des Affections Parasitaires, LIG-MRTC-ICER, FMPOS-FAPH, USTTB, Mali
| | - A Ongoiba
- Malaria Research and Training Center/Département d'Epidémiologie des Affections Parasitaires, LIG-MRTC-ICER, FMPOS-FAPH, USTTB, Mali
| | - K Sidibé
- Malaria Research and Training Center/Département d'Epidémiologie des Affections Parasitaires, LIG-MRTC-ICER, FMPOS-FAPH, USTTB, Mali
| | - A Traoré
- Malaria Research and Training Center/Département d'Epidémiologie des Affections Parasitaires, LIG-MRTC-ICER, FMPOS-FAPH, USTTB, Mali
| | - J Sangala
- Malaria Research and Training Center/Département d'Epidémiologie des Affections Parasitaires, LIG-MRTC-ICER, FMPOS-FAPH, USTTB, Mali
| | - K Kayentao
- Malaria Research and Training Center/Département d'Epidémiologie des Affections Parasitaires, LIG-MRTC-ICER, FMPOS-FAPH, USTTB, Mali
| | - T M Tran
- Laboratory of Immunogenetics/NIAID, 5601 Fishers Lane, MSC 9806, Bethesda, MD 20892-9806 (deliveries: Rockville, MD 20852), USA
| | - P D Crompton
- Laboratory of Immunogenetics/NIAID, 5601 Fishers Lane, MSC 9806, Bethesda, MD 20892-9806 (deliveries: Rockville, MD 20852), USA
| | - B Traoré
- Malaria Research and Training Center/Département d'Epidémiologie des Affections Parasitaires, LIG-MRTC-ICER, FMPOS-FAPH, USTTB, Mali
| | - O K Doumbo
- Malaria Research and Training Center/Département d'Epidémiologie des Affections Parasitaires, LIG-MRTC-ICER, FMPOS-FAPH, USTTB, Mali
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16
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Abstract
The thermodynamic dislocation theory developed for nonuniform plastic deformations is used here to simulate the stress-strain curves for crystals subjected to antiplane shear-controlled load reversal. We show that the presence of the positive back stress during the load reversal reduces the magnitude of shear stress required to pull excess dislocations back to the center of the specimen. There, the excess dislocations of opposite signs meet and annihilate each other leading to the Bauschinger effect.
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Affiliation(s)
- K C Le
- Lehrstuhl für Mechanik-Materialtheorie, Ruhr-Universität Bochum, D-44780 Bochum, Germany
| | - T M Tran
- Lehrstuhl für Mechanik-Materialtheorie, Ruhr-Universität Bochum, D-44780 Bochum, Germany
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17
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Abstract
The statistical-thermodynamic dislocation theory developed in previous papers is used here in an analysis of high-temperature deformation of aluminum and steel. Using physics-based parameters that we expect theoretically to be independent of strain rate and temperature, we are able to fit experimental stress-strain curves for three different strain rates and three different temperatures for each of these two materials. Our theoretical curves include yielding transitions at zero strain in agreement with experiment. We find that thermal softening effects are important even at the lowest temperatures and smallest strain rates.
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Affiliation(s)
- K C Le
- Lehrstuhl für Mechanik-Materialtheorie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - T M Tran
- Lehrstuhl für Mechanik-Materialtheorie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - J S Langer
- Department of Physics, University of California, Santa Barbara, Santa Barbara, California 93106-9530, USA
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18
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Abstract
Collisional damping of electron plasma waves, the primary damping for high phase velocity waves, is proportional to the electron-ion collision rate, ν_{ei,th}. Here, it is shown that the damping rate normalized to ν_{ei,th} depends on the charge state, Z, on the magnitude of ν_{ei,th} and the wave number k in contrast with the commonly used damping rate in plasma wave research. Only for weak collision rates in low-Z plasmas for which the electron self-collision rate is comparable to the electron-ion collision rate is the damping rate given by the commonly accepted value. The result presented here corrects the result presented in textbooks at least as early as 1973. The complete linear theory requires the inclusion of both electron-ion pitch-angle and electron-electron scattering, which itself contains contributions to both pitch-angle scattering and thermalization.
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Affiliation(s)
- J W Banks
- Rensselaer Polytechnic Institute, Department of Mathematical Sciences, Troy, New York 12180, USA
| | - S Brunner
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland
| | - R L Berger
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA
| | - W J Arrighi
- Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA
| | - T M Tran
- Ecole Polytechnique Fédérale de Lausanne (EPFL), Swiss Plasma Center (SPC), CH-1015 Lausanne, Switzerland
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19
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de Lange N, Tran TM, Abate AR. Electrical lysis of cells for detergent-free droplet assays. Biomicrofluidics 2016; 10:024114. [PMID: 27051471 PMCID: PMC4808063 DOI: 10.1063/1.4944742] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Accepted: 03/13/2016] [Indexed: 05/06/2023]
Abstract
Efficient lysis is critical when analyzing single cells in microfluidic droplets, but existing methods utilize detergents that can interfere with the assays to be performed. We demonstrate robust cell lysis without the use of detergents or other chemicals. In our method, cells are exposed to electric field immediately before encapsulation in droplets, resulting in cell lysis. We characterize lysis efficiency as a function of control parameters and demonstrate compatibility with enzymatic assays by measuring the catalysis of β-glucosidase, an important cellulase used in the conversion of biomass to biofuel. Our method enables assays in microfluidic droplets that are incompatible with detergents.
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Affiliation(s)
| | - T M Tran
- Bioengineering and Therapeutic Sciences, University of California San Francisco , San Francisco, California 14958, USA
| | - A R Abate
- Bioengineering and Therapeutic Sciences, University of California San Francisco , San Francisco, California 14958, USA
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20
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Alberti S, Braunmueller F, Tran TM, Genoud J, Hogge JP, Tran MQ, Ansermet JP. Nanosecond pulses in a THz gyrotron oscillator operating in a mode-locked self-consistent Q-switch regime. Phys Rev Lett 2013; 111:205101. [PMID: 24289692 DOI: 10.1103/physrevlett.111.205101] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Indexed: 05/05/2023]
Abstract
An experimental study of a nanosecond pulsed regime in a THz gyrotron oscillator operating in a self-consistent Q-switch regime has been carried out. The gyrotron is operated in the TE(7,2) transverse mode radiating at a frequency of 260.5 GHz. The 5 W nanosecond pulses are obtained in a self-consistent Q-switch regime in which the cavity diffraction quality factor dynamically varies by nearly 2 orders of magnitude on a subnanosecond time scale via the nonlinear interaction of different mode-locked frequency-equidistant sidebands. The experimental results are in good agreement with numerical simulations performed with the TWANG code based on a slow time scale formulation of the self-consistent time-dependent nonlinear wave particle interaction equations.
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Affiliation(s)
- S Alberti
- Centre de Recherches en Physique des Plasmas, Station 13, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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21
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Lima-Junior JC, Jiang J, Rodrigues-da-Silva RN, Banic DM, Tran TM, Ribeiro RY, Meyer VSE, De-Simone SG, Santos F, Moreno A, Barnwell JW, Galinski MR, Oliveira-Ferreira J. B cell epitope mapping and characterization of naturally acquired antibodies to the Plasmodium vivax merozoite surface protein-3α (PvMSP-3α) in malaria exposed individuals from Brazilian Amazon. Vaccine 2011; 29:1801-11. [PMID: 21215342 DOI: 10.1016/j.vaccine.2010.12.099] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2010] [Revised: 12/02/2010] [Accepted: 12/22/2010] [Indexed: 10/18/2022]
Abstract
The Plasmodium vivax Merozoite Surface Protein-3α (PvMSP-3α) is considered as a potential vaccine candidate. However, the detailed investigations of the type of immune responses induced in naturally exposed populations are necessary. Therefore, we aim to characterize the naturally induced antibody to PvMSP-3α in 282 individuals with different levels of exposure to malaria infections residents in Brazilian Amazon. PvMSP3 specific antibodies (IgA, IgG and IgG subclass) to five recombinant proteins and the epitope mapping by Spot-synthesis technique to full-protein sequence of amino acids (15aa sequence with overlapping sequence of 9aa) were performed. Our results indicates that PvMSP3 is highly immunogenic in naturally exposed populations, where 78% of studied individuals present IgG immune response against the full-length recombinant protein (PVMSP3-FL) and IgG subclass profile was similar to all five recombinant proteins studied with a high predominance of IgG1 and IgG3. We also observe that IgG and subclass levels against PvMSP3 are associated with malaria exposure. The PvMSP3 epitope mapping by Spot-synthesis shows a natural recognition of at least 15 antigenic determinants, located mainly in the two blocks of repeats, confirming the high immunogenicity of this region. In conclusion, PvMSP-3α is immunogenic in naturally exposed individuals to malaria infections and that antibodies to PvMSP3 are induced to several B cell epitopes. The presence of PvMSP3 cytophilic antibodies (IgG1 and IgG3), suggests that this mechanism could also occur in P. vivax.
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Affiliation(s)
- J C Lima-Junior
- Laboratory of Immunoparasitology, Institute Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil
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22
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Lima-Junior JC, Banic DM, Tran TM, Meyer VSE, De-Simone SG, Santos F, Porto LCS, Marques MTQ, Moreno A, Barnwell JW, Galinski MR, Oliveira-Ferreira J. Promiscuous T-cell epitopes of Plasmodium merozoite surface protein 9 (PvMSP9) induces IFN-gamma and IL-4 responses in individuals naturally exposed to malaria in the Brazilian Amazon. Vaccine 2010; 28:3185-91. [PMID: 20189487 DOI: 10.1016/j.vaccine.2010.02.046] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2009] [Revised: 01/28/2010] [Accepted: 02/11/2010] [Indexed: 11/16/2022]
Abstract
Plasmodium vivax merozoite surface protein (PvMSP9) stimulates both cellular and humoral immune responses in individuals who are naturally infected by this parasite species. To identify immunodominant human T-cell epitopes in PvMSP9, we used the MHC class II binding peptide prediction algorithm ProPred. Eleven synthetic peptides representing predicted putative promiscuous T-cell epitopes were tested in IFN-gamma and IL-4 ELISPOT assays using peripheral blood mononuclear cells (PBMC) derived from 142 individuals from Rondonia State, Brazil who had been naturally exposed to P. vivax infections. To determine whether the predicted epitopes are preferentially recognized in the context of multiple alleles, MHC Class II typing of the cohort was also performed. Five synthetic peptides elicited robust cellular responses, and the overall frequencies of IFN-gamma and IL-4 responders to at least one of the promiscuous peptides were 62% and 46%, respectively. The frequencies of IFN-gamma and IL-4 responders to each peptide were not associated with a particular HLA-DRB1 allelic group since most of the peptides induced a response in individuals of 12 out of 13 studied allelic groups. The prediction of promiscuous epitopes using ProPred led to the identification of immunodominant epitopes recognized by PBMC from a significant proportion of a genetically heterogeneous population exposed to malaria infections. The combination of several such T-cell epitopes in a vaccine construct may increase the frequency of responders and the overall efficacy of subunit vaccines in genetically distinct populations.
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Affiliation(s)
- J C Lima-Junior
- Laboratory of Immunoparasitology, Institute Oswaldo Cruz, Fiocruz, Rio de Janeiro, RJ, Brazil
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23
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Angelino P, Garbet X, Villard L, Bottino A, Jolliet S, Ghendrih P, Grandgirard V, McMillan BF, Sarazin Y, Dif-Pradalier G, Tran TM. Role of plasma elongation on turbulent transport in magnetically confined plasmas. Phys Rev Lett 2009; 102:195002. [PMID: 19518964 DOI: 10.1103/physrevlett.102.195002] [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] [Received: 09/26/2008] [Indexed: 05/27/2023]
Abstract
The theoretical study of plasma turbulence is of central importance to fusion research. Experimental evidence indicates that the confinement time results mainly from the turbulent transport of energy, the magnitude of which depends on the turbulent state resulting from nonlinear saturation mechanisms, in particular, the self-generation of coherent macroscopic structures and large scale flows. Plasma geometry has a strong impact on the structure and magnitude of these flows and also modifies the mode linear growth rates. Nonlinear global gyrokinetic simulations in realistic tokamak magnetohydrodynamic equilibria show how plasma shape can control the turbulent transport. Results are best described in terms of an effective temperature gradient. With increasing plasma elongation, the nonlinear critical effective gradient is not modified while the stiffness of transport is decreasing.
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Affiliation(s)
- P Angelino
- Association Euratom-CEA, CEA/DSM/IRFM, Cadarache, France
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24
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Abstract
BACKGROUND Whether twins are more prone to increased neonatal morbidity than singletons remains controversial. It was the aim of this study to define the special risks of preterm twins with an emphasis on cerebral morbidity. METHODS A retrospective chart review was carried out of all consecutively born twins (n = 230) and the corresponding sets of singletons of a single level-III neonatal intensive care unit. The subjects had a gestational age between 24 and 37 weeks, and were born in 1990-98. RESULTS Twin pregnancies were more often complicated by preterm contractions (odds ratio (OR) 4.03 (95% confidence interval (CI) 2.39, 6.78)) whereas gestosis was significantly less (OR 0.14 (95% CI 0.05, 0.41)). Grades III and IV intracranial bleeding occurred significantly more often in twins compared to singletons (OR 3.75 (95% CI 1.65, 8.97)), with infants of less than 32 weeks' gestational age being predominantly affected (OR 3.31 (95% CI 1.33, 8.29)). Infants of less than 32 weeks' gestational age developed respiratory distress syndrome more often than the corresponding singletons (OR 1.93 (95% CI 1.15, 3.25)). There were no differences in all observed items between the first- and second-born twins. CONCLUSION Twins of less than 37 weeks' gestational age were significantly more often affected by high-grade intraventricular hemorrhage irrespective of birth order. Periventricular leukomalacia occurred twice as often as in singletons. There were no differences with respect to mortality and further morbidity except for respiratory distress syndrome in preterm twins of less than 32 weeks' gestational age.
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Affiliation(s)
- W Rettwitz-Volk
- Department of Pediatrics, Division of Neonatology, University Hospital Frankfurt am Main, Germany
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25
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Arrate MP, Rodriguez JM, Tran TM, Brock TA, Cunningham SA. Cloning of human junctional adhesion molecule 3 (JAM3) and its identification as the JAM2 counter-receptor. J Biol Chem 2001; 276:45826-32. [PMID: 11590146 DOI: 10.1074/jbc.m105972200] [Citation(s) in RCA: 159] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have identified a third member of the junctional adhesion molecule (JAM) family. At the protein level JAM3 displays 36 and 32% identity to JAM2 and JAM1, respectively. The coding region is distributed over 9 exons and maps to chromosome 11q25. The gene shows widespread tissue expression with higher levels apparent in the kidney, brain, and placenta. At the cellular level we show expression of JAM3 transcript within endothelial cells. Our major finding is that JAM3 and JAM2 are binding partners. Thus, JAM3 ectodomain binds firmly to JAM2-Fc. This heterotypic interaction is maintained when JAM3-Fc is used to capture Chinese hamster ovary cells expressing full-length JAM2. In static adhesion assays we show that JAM3 is unable to bind to leukocyte cell lines. This is consistent with the lack of JAM2 expression. However, using JAM2-Fc pull-down experiments in combination with polyclonal anti-JAM3 serum, we demonstrate that JAM3 is the previously uncharacterized 43-kDa counter-receptor that mediates JAM2 adhesion to T cells. Most significantly we demonstrate up-regulation of JAM3 protein on peripheral blood lymphocytes following activation. Finally we show the utility of JAM3 ectodomain as an inhibitor of JAM2 adhesion.
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Affiliation(s)
- M P Arrate
- Department of Pharmacology, Texas Biotechnology Corporation, Houston, Texas 77030, USA
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26
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Tran TM, Ivanyi P, Hilgert I, Brdicka T, Pla M, Breur B, Flieger M, Ivasková E, Horejsí V. The epitope recognized by pan-HLA class I-reactive monoclonal antibody W6/32 and its relationship to unusual stability of the HLA-B27/beta2-microglobulin complex. Immunogenetics 2001; 53:440-6. [PMID: 11685454 DOI: 10.1007/s002510100353] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2001] [Accepted: 07/05/2001] [Indexed: 10/27/2022]
Abstract
A broadly used pan-HLA class I-reactive monoclonal antibody W6/32 is believed to recognize a conformational epitope dependent on association between heavy chains and beta2-microglobulin (beta2m). However, in the present study we report that W6/32 does recognize at least some free HLA class I heavy chains under the partially denaturating conditions of nonreducing Western blotting, namely nearly all HLA-B allelic products. Furthermore, we confirm and largely extend our previous observation that complexes of beta2m with heavy chains of a few HLA class I allelic forms (most notably HLA-B27) exhibit unusual resistance to dissociation by SDS, which is reminiscent of MHC class II molecules. In addition, our data indicate the existence of covalent (disulfide-linked) heterodimers of certain HLA class I heavy chains (namely Cw1 and Cw4) and beta2m.
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Affiliation(s)
- T M Tran
- Institute of Clinical and Experimental Medicine, HLA Centre, Vídenská 1958, 14000 Prague 4, Czech Republic
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27
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Weston AP, Banerjee SK, Sharma P, Tran TM, Richards R, Cherian R. p53 protein overexpression in low grade dysplasia (LGD) in Barrett's esophagus: immunohistochemical marker predictive of progression. Am J Gastroenterol 2001; 96:1355-62. [PMID: 11374668 DOI: 10.1111/j.1572-0241.2001.03851.x] [Citation(s) in RCA: 155] [Impact Index Per Article: 6.7] [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: 12/11/2022]
Abstract
OBJECTIVES The presence of low grade dysplasia (LGD) within Barrett's esophagus (BE) has a multitude of ramifications. Identification of markers that could risk stratify LGD would be of great clinical benefit. We aimed to prospectively evaluate the prognosis of the immunohistochemical overexpression of p53 protein in BE colocalized to LGD. METHODS Consecutive BE patients in whom LGD was found had a repeat esophagogastroduodenoscopy within 8-12 wk per an ongoing prospective study. At each esophagogastroduodenoscopy, a therapeutic scope was used in conjunction with the Seattle Biopsy Protocol. Patients were observed until development of multifocal high grade dysplasia (mHGD), presence of an HGD dysplasia-associated lesion or mass (DALM) lesion, or frank adenocarcinoma. p53 protein overexpression was determined by computerized immunoquantitation using image analysis software on step serial-sectioned specimens of BE segment(s) harboring LGD. Kaplan-Meier survival curves were made on the ability of p53 staining colocalized to areas of LGD to predict progression to mHGD, HGD DALM, or cancer during prospective follow-up. RESULTS Forty-eight BE patients with LGD were observed for a mean of 41.2+/-22.5 months. During this period, five of 48 patients progressed to mHGD with a focus in which intramucosal cancer could not be excluded (one), mHGD/DALM with one or more foci in which intramucosal cancer could not be excluded (two), cancer (one), or mHGD (one). Twelve had persistent LGD and 31 had regressed to no dysplasia. p53 staining was positive and colocalized to areas of LGD in 4/31 of patients that regressed, 3/12 that persisted, and 3/5 that progressed. Kaplan-Meier curves differed significantly between p53 positive and negative patients for outcome defined as progression of LGD. CONCLUSIONS p53 colocalization with LGD at index LGD diagnosis is a risk factor for progression of LGD. This can potentially be used to risk stratify BE LGD patients in terms of surveillance intervals or enrollment into secondary prevention studies.
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Affiliation(s)
- A P Weston
- Cancer Research Unit, Research Division, Veterans Administration Medical Center, Kansas City, Missouri 64128-2226, USA
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28
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Tran TM, Komatsu T, Nguyen TK, Nguyen VC, Yoshimura Y, Takahashi K, Wariishi M, Sakai T, Yamamoto S. Blood pressure, serum cholesterol concentration and their related factors in urban and rural elderly of Ho Chi Minh City. J Nutr Sci Vitaminol (Tokyo) 2001; 47:147-55. [PMID: 11508706 DOI: 10.3177/jnsv.47.147] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
In Vietnam, information about blood pressure, serum lipids and their factors is limited. To obtain some of this information, a cross sectional nutrition survey was carried out in an urban and rural area of Ho Chi Minh City with 217 participants aged 60-69 y (148 females and 69 males). Anthropometry and blood pressure were measured. For three consecutive weekdays, 24 h dietary recalls were performed. Single 24 h urine was collected for sodium and potassium analysis. A fasting blood sample was taken and biochemical parameters were measured. Results indicate a high percentage of hypertension in urban (female: 35.5%, male: 43.8%) and rural areas (female: 22.2%, male: 35.1%). Blood pressure was correlated with body mass index (BMI) and 24 h urinary sodium-to-potassium (Na/K) ratio. A high prevalence of serum total cholesterol (TC) above 220 mg/dL (female: 55.3%, male: 31.3%) and overweight (female: 34.2%, male: 25.0%) were observed in urban residents. By contrast, 5.6% and 24.3% of rural females and males respectively had TC below 150 mg/dL and both genders had the same prevalence of underweight (32.4%). TC was positively correlated with body weight, BMI, dietary protein and dietary lipids. Overweight might be a major risk factor for hypertension in our urban elderly. A high Na/K intake ratio might be a risk factor for hypertension in both areas. The high prevalence of elevated TC in the urban area might to be related to the high lipid intake, and the high prevalence of low TC in the rural area might to be related to the low lipid intake.
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Affiliation(s)
- T M Tran
- Department of Nutrition, School of Medicine, The University of Tokushima, Japan
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29
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Tran TM, Horejsí V, Weinreich S, Pla M, Breur BS, Capková J, Flieger M, Ivanyi P, Ivasková E. Strong association of HLA-B27 heavy chain with beta 2-microglobulin. Hum Immunol 2000; 61:1197-201. [PMID: 11163075 DOI: 10.1016/s0198-8859(00)00220-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Monoclonal antibody TG1 recognizes specifically antigens HLA-B27, B7, B22 and B17 on cell surface in cytotoxicity and cytofluorometry tests. When cell detergent extracts were subjected to SDS PAGE under mild conditions (no heating and no reduction of the sample) followed by Western blotting, TG1 detected exclusively a complex of B27 heavy chains with beta(2)-microglobulin (as a 50 kDa band) whereas the other B-locus antigens (B7, B22, B17) were detected as free 43 kDa heavy chains under the same conditions. When the samples were boiled prior to SDS PAGE, TG1 detected again the 43 kDa free heavy chains of B7, B22 and B17 but no zone corresponding to B27 could be detected indicating that the epitope in free B27 chains is more sensitive to denaturation by SDS. Thus, our main finding is that the interaction of HLA-B27 heavy chain with beta(2)-microglobulin appears to be stronger than that of the other HLA-B chains. The resistance of the HLA-B27/beta(2)-microglobulin complex to the SDS dissociation is strikingly similar to the behavior of MHC class II molecules under similar conditions. Thus, it may be speculated that HLA-B27 complexes can be also more stable than other MHC class I molecules under more physiological dissociative conditions (e.g. in endosomal compartments). This feature might potentially influence antigen presentation by HLA-B27 and contribute to the well known disease linkage of HLA-B27.
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Affiliation(s)
- T M Tran
- Institute of Clinical and Experimental Medicine, HLA Centre, Videnská 1958, 4, Prague, Czech Republic.
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Abstract
OBJECTIVE To determine whether the enhancement of threshold sural sensory nerve action potentials (SNAPs) occurred in patients with spinal cord injury after upper limb isometric contraction. DESIGN This prospective study, in which ten paraplegic patients with spinal cord injury were recruited from the Harris County community and served as his/her own control, was performed in the electromyography laboratory at Harris County Hospital District Quentin Mease Hospital. The baseline SNAP was established using ten threshold, signal-averaged stimuli to the sural nerve. With the same stimulus strength, the SNAP was recorded while the subjects' arms were pulled apart against a force gauge at 50% and 100% maximum force. Responses were recorded every 4 min until the values returned to baseline. RESULTS Results showed an increase in the SNAP amplitude after 50% and 100% maximum force. The mean preexercise SNAP amplitude was 4.0 +/- 0.6 (SE) microV. At 50% force, the SNAP amplitude was 7.57 +/- 1.2 microV; at 100% force, it was 7.29 +/- 1.2 microV. The post hoc analysis of the data revealed P = 0.009 and P = 0.01 for 50% and 100% maximum force, respectively. CONCLUSIONS The threshold SNAP of the sural nerve was enhanced after isometric exercise in paraplegic patients with spinal cord injury.
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Affiliation(s)
- T M Tran
- Department of Physical Medicine and Rehabilitation, Baylor College of Medicine, Houston, Texas, USA
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Banerjee SK, Zoubine MN, Tran TM, Weston AP, Campbell DR. Overexpression of vascular endothelial growth factor164 and its co-receptor neuropilin-1 in estrogen-induced rat pituitary tumors and GH3 rat pituitary tumor cells. Int J Oncol 2000; 16:253-60. [PMID: 10639567 DOI: 10.3892/ijo.16.2.253] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We have shown previously that the VEGF system plays a crucial role in regulation of tumor angiogenesis during the development of estrogen-induced prolactin-secreting pituitary tumors in Fisher 344 rats. Studies also suggested that both endothelial and non-endothelial cells expressed VEGF. However, several questions concerning the VEGF signals in regulation of estrogen-induced angiogenesis in rat pituitary remained unanswered. VEGF exists in a number of isoforms in human and rodent tissue (i.e., VEGF206h/205r, VEGF189h/188r, VEGF165h/164r, VEGF145h/144r and VEGF121) that differ in their molecular masses and biological activities. The VEGF isoforms bind with two tyrosine-kinase receptors, KDR/flk-1 and flt-1. In addition, VEGF165 binds with a newly identified co-receptor, neuropilin-1, which is expressed in human endothelial cells and several types of non-endothelial cells including tumor cells. The present study was undertaken to elucidate which isoforms of VEGF are predominantly expressed in normal Fisher 344 rat pituitaries, estrogen-induced prolactin secreting rat pituitary tumors and in prolactin secreting rat pituitary tumor cell line (GH3 cell line). To identify the isoform, RT-PCR with primer pairs derived from exon 1 and exon 8 of the VEGF gene, cloning, sequencing and Western blot analysis were performed. The status of neuropilin-1 in the rat pituitaries (normal and transformed) and GH3 pituitary tumor cell line has also been investigated using RT-PCR and Western blot analysis. These studies demonstrate that normal rat pituitaries, estrogen-induced rat pituitary tumors and GH3 pituitary tumor cells expressed VEGF164 and co-receptor, neuropilin-1. The VEGF164 was the predominant form in all of these cells. The VEGF164 and neuropilin-1 mRNA and protein levels were significantly higher in the estrogen-induced pituitary tumors and GH3 tumor cell line, as compared to normal pituitary. The data suggest that both VEGF164 and neuropilin-1 may actively participate in modulation of tumor angiogenesis and the development of pituitary tumors in Fisher 344 rats.
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Affiliation(s)
- S K Banerjee
- Cancer Research Unit, Research Division 151, V.A. Medical Center, Kansas City, MO 64128, USA
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Cunningham SA, Tran TM, Arrate MP, Brock TA. Characterization of vascular endothelial cell growth factor interactions with the kinase insert domain-containing receptor tyrosine kinase. A real time kinetic study. J Biol Chem 1999; 274:18421-7. [PMID: 10373449 DOI: 10.1074/jbc.274.26.18421] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The kinase insert domain-containing receptor (KDR) tyrosine kinase mediates calcium mobilization in endothelial cells and plays a key role during physiological and pathological angiogenesis. To provide a detailed understanding of how KDR is activated, we analyzed the kinetics of ligand-receptor interaction using BIAcore. Both predimerized (KDR-Fc) and monomeric (KDR-cbu) receptors were examined with vascular endothelial cell growth factor (VEGF) homodimers and VEGF/placental growth factor (PlGF) heterodimers. VEGF binds to KDR-Fc with ka = 3.6 +/- 0.07e6, kd = 1.34 +/- 0.19e-4, and KD = 37.1 +/- 4.9 pM. These values are similar to those displayed by monomeric KDR where ka = 5.23 +/- 1.4e6, kd = 2.74 +/- 0.76e-4, and KD = 51.7 +/- 5.8 pM were apparent. In contrast, VEGF/PlGF bound to KDR-Fc with ka = 7.3 +/- 1.6e4, kd = 4.4 +/- 1. 2e-4, and KD = 6 +/- 1.2 nM. Thus, the heterodimer displays a 160-fold reduced KD for binding to predimerized KDR, which is mainly a consequence of a 50-fold reduction in ka. We were unable to detect association between VEGF/PlGF and monomeric KDR. However, nanomolar concentrations of VEGF/PlGF were able to elicit weak calcium mobilization in endothelial cells. This latter observation may indicate partial predimerization of KDR on the cell surface or facilitation of binding due to accessory receptors.
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Affiliation(s)
- S A Cunningham
- Department of Pharmacology, Texas Biotechnology Corporation, Houston, Texas 77030, USA.
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Cunningham SA, Tran TM, Arrate MP, Bjercke R, Brock TA. KDR activation is crucial for VEGF165-mediated Ca2+ mobilization in human umbilical vein endothelial cells. Am J Physiol 1999; 276:C176-81. [PMID: 9886933 DOI: 10.1152/ajpcell.1999.276.1.c176] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We have prepared a polyclonal mouse antibody directed against the first three immunoglobulin-like domains of the kinase insert domain-containing receptor (KDR) tyrosine kinase. It possesses the ability to inhibit binding of the 165-amino acid splice variant of vascular endothelial cell growth factor (VEGF165) to recombinant KDR in vitro as well as to reduce VEGF165 binding to human umbilical vein endothelial cells (HUVEC). These results confirm that the first three immunoglobulin-like domains of KDR are involved in VEGF165 interactions. The anti-KDR antibody is able to completely block VEGF165-mediated intracellular Ca2+ mobilization in HUVEC. Therefore, it appears that binding of VEGF165 to the fms-like tyrosine kinase (Flt-1) in these cells does not translate into a Ca2+ response. This is further exemplified by the lack of response to placental growth factor (PlGF), an Flt-1-specific ligand. Additionally, PlGF is unable to potentiate the effects of submaximal concentrations of VEGF165. Surprisingly, the VEGF-PlGF heterodimer was also very inefficient at eliciting a Ca2+ signaling event in HUVEC. We conclude that KDR activation is crucial for mobilization of intracellular Ca2+ in HUVEC in response to VEGF165.
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Affiliation(s)
- S A Cunningham
- Department of Pharmacology, Texas Biotechnology Corporation, Houston, 77030, Texas
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Kneen R, Pham NG, Solomon T, Tran TM, Nguyen TT, Tran BL, Wain J, Day NP, Tran TH, Parry CM, White NJ. Penicillin vs. erythromycin in the treatment of diphtheria. Clin Infect Dis 1998; 27:845-50. [PMID: 9798043 DOI: 10.1086/514959] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
In an open-label, randomized trial, 44 Vietnamese children with diphtheria were given penicillin therapy (intramuscular benzylpenicillin, 50,000 U/[kg.d] for 5 days and then oral penicillin, 50 mg/[kg.d] for 5 days), and 42 were given erythromycin therapy (50 mg/[kg.d] orally for 10 days). There were no differences in times to membrane clearance or bacteriologic clearance, but median times to fever clearance were 27 hours (95% confidence interval [CI], 19-30; range, 0-124 hours) for penicillin recipients and 46 hours (95% CI, 34-54; range, 0-148 hours) for erythromycin recipients (P = .0004). In the penicillin group, acute treatment failed for one patient, and one patient relapsed. Three patients in the penicillin group developed diphtheritic myocarditis as evidenced by abnormal electrocardiograms. Erythromycin did not cause prolongation of the QT interval corrected for heart rate. Cultures of specimens from 15 patients (17.4%) were positive for toxigenic Corynebacterium diphtheriae. All isolates were susceptible to penicillin, but for isolates (27%), all of which were from patients who received penicillin treatment, were resistant to erythromycin (minimum inhibitory concentrations, > 64 mg/L). Penicillin is recommended as first-line treatment for diphtheria in Vietnam.
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Affiliation(s)
- R Kneen
- Wellcome Trust Clinical Research Unit, Centre for Tropical Diseases, Cho Quan Hospital, Ho Chi Minh City, Vietnam
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Abstract
Most children with cystic fibrosis (CF) show persisting steatorrhoea even when treated with pancreatic enzyme. As a low duodenal pH could be responsible for this persisting fat loss, we evaluated the effects of a proton-pump inhibitor (lansoprazole) on both steatorrhoea and growth parameters in 15 CF patients, aged 3.1-22.6 y. Acid steatocrit, anthropometry and dual-energy X-ray absorptiometry were used to evaluate steatorrhoea and the nutritional status before, during and 3 months after stopping lansoprazole treatment (15 mg/d for 3 months). Mean +/- SD acid steatocrit values decreased from 37.1 +/- 8.8% to 28.5 +/- 10.6% (p = 0.02). Significant mean Z-score improvements were found for weight (+0.14; p = 0.02), height (+0.15; p = 0.03), subscapular (+0.61; p = 0.003), supra-iliac (+0.8; p = 0.002) and the sum of the four measured skinfolds (+0.61; p = 0.002). Z-scores deteriorated again after stopping lansoprazole. Fat mass and bone mineral content increased significantly on lansoprazole (p = 0.008 and p = 0.005, respectively). We conclude that lansoprazole as adjuvant therapy significantly improves both steatorrhoea and the nutritional status in CF children who maintain steatorrhoea while on pancreatic enzymes.
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Affiliation(s)
- T M Tran
- Department of Pediatrics, University Hospital of Maastricht, The Netherlands
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36
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Verlander JW, Tran TM, Zhang L, Kaplan MR, Hebert SC. Estradiol enhances thiazide-sensitive NaCl cotransporter density in the apical plasma membrane of the distal convoluted tubule in ovariectomized rats. J Clin Invest 1998; 101:1661-9. [PMID: 9541496 PMCID: PMC508747 DOI: 10.1172/jci601] [Citation(s) in RCA: 88] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Recent data suggest that sex hormones affect the thiazide-sensitive NaCl cotransporter (TSC) density or binding capacity (Chen, Z., D.A. Vaughn, and D.D. Fanestil. 1994. J. Am. Soc. Nephrol. 5:1112-1119). Thus, we determined the effect of ovariectomy (OVX) and estrogen replacement on the ultrastructural localization of TSC in rat kidney using immunocytochemistry. Kidneys of intact female (CON) and OVX rats fed ad libitum for 6 and 9 wk or pair-fed for 9 wk were processed for transmission electron microscopy. Immunogold localization of rat TSC (rTSC1) demonstrated intense label in the apical plasma membrane of CON distal convoluted tubule (DCT). In OVX DCT, rTSC1 label and apical plasma membrane microprojections were decreased. Western blots of renal membrane protein from pair-fed CON and OVX revealed bands at 129-135 kD, but the OVX signal was reduced. Morphometric analyses demonstrated that injecting 10 microg/ kg body weight 17beta-estradiol subcutaneously 4x/wk in OVX rats restored DCT apical microprojections and label density for rTSC1. Thus, in OVX rats (a) rTSC1 immunoreactive renal membrane protein is reduced; (b) apical plasma membrane complexity and immunogold label for rTSC1 in DCT is decreased; and (c) estradiol replacement restores DCT ultrastructure and rTSC1 label to normal. We conclude that estrogen enhances the density of rTSC1 in the DCT, and may alter renal Na transport by this mechanism.
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Affiliation(s)
- J W Verlander
- Division of Nephrology, Hypertension, and Transplantation, University of Florida College of Medicine, Gainesville, Florida 32610-0224, USA.
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37
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Abstract
Malabsorption of fat is an important gastrointestinal cause of malnutrition and growth retardation in childhood. The gold standard for the evaluation of fat malabsorption is the faecal fat balance method. The acid steatocrit method has recently been introduced as a simple method to evaluate faecal fat. The present study was aimed at evaluating the acid steatocrit in clinical practice. Faecal fat excretion and acid steatocrit results were determined in 42 children, half with and half without fat malabsorption. Acid steatocrit results correlated significantly with both faecal fat excretion (p < 0.01) and faecal fat concentration (p < 0.001). Sensitivity and specificity of the acid steatocrit for the diagnosis of malabsorption were 90% and 100%, respectively. We consider the acid steatocrit method useful for the screening and monitoring of patients with steatorrhoea.
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Affiliation(s)
- A Van den Neucker
- Department of Paediatrics, University Hospital Maastricht, The Netherlands
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38
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Hasunuma T, Morimoto T, Tran TM, Müller-Ladner U, Aono H, Ogawa R, Gay S, Nishioka K. Tenosynovial nodulosis in a patient infected with human T cell lymphotropic virus I. Arthritis Rheum 1997; 40:578-82. [PMID: 9082948 DOI: 10.1002/art.1780400327] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We describe a 45-year-old man who presented with multiple nodules along the tendons of the scapular region, the elbows, wrists, forearms, thighs, and ankles. The patient was a carrier of human T cell lymphotropic virus I (HTLV-I), which was probably transmitted from his mother; his mother also had polyarthritis. Histopathologically, the nodules consisted of numerous, small, fibrinoid masses. The synovium adjacent to the tendon sheath was hyperplastic, with fibrinoid necrosis mimicking rheumatoid synovium. However, synovitis was not present inside the adjacent joint. HTLV-I proviral DNA was detected in the cells of the nodule, in tenosynovial cells, and in peripheral blood lymphocytes, but not in skin fibroblasts. In situ reverse transcription assay showed a high quantity of tax/rex messenger RNA in the proliferating lining cells. Based on these features, we classified this case as an atypical manifestation of HTLV-I-associated arthropathy associated with fibrinoid nodules resulting from chronic tenosynovitis.
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Affiliation(s)
- T Hasunuma
- Institute of Medical Science, St. Marianna University, Kawasaki, Japan
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39
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Huynh DP, Tran TM, Nechiporuk T, Pulst SM. Expression of neurofibromatosis 2 transcript and gene product during mouse fetal development. Cell Growth Differ 1996; 7:1551-61. [PMID: 8930405] [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] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Neurofibromatosis 2 (NF2) is an autosomal dominant inherited disorder that predisposes to benign tumors of the nervous system as well as a variety of ocular abnormalities. In contrast to NF1, NF2 is associated with only minor developmental abnormalities. The human NF2 gene encodes a tumor suppressor protein, termed schwannomin or merlin, which is a member of a superfamily of proteins thought to link cytoskeletal elements to cell membrane components. To determine the pattern of NF2 gene expression in mouse embryos, we sequenced the mouse NF2 gene and used in situ hybridization and antischwannomin antibodies to determine the developmental expression of the NF2 gene. Schwannomin was detected in most differentiated tissues but was undetectable in undifferentiated tissues. In particular, schwannomin was not detectable in mitotic neuroepithelial cells, the perichondrium, the liver, the neocortex, and the ventricular zone of the developing cerebral cortex. In the heart, expression was observed in all developmental stages beginning on embryonic day 8. In the eye, which shows developmental abnormalities in NF2 patients, expression was detected in the cells of the lens and in the pigment epithelium but weakly detected in retinal neurons. The most striking example of tightly regulated NF2 expression was observed in cells migrating from the ventricular zone to the cortical plate on embryonic days 15 and 16. Only cells in the intermediate zone expressed schwannomin, indicating that schwannomin may play an important role in cellular migration.
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Affiliation(s)
- D P Huynh
- Neurogenetics Laboratory, Burns and Allen Research Institute, UCLA, School of Medicine 90048, USA
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40
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Celada P, Siuciak JA, Tran TM, Altar CA, Tepper JM. Local infusion of brain-derived neurotrophic factor modifies the firing pattern of dorsal raphé serotonergic neurons. Brain Res 1996; 712:293-8. [PMID: 8814905 DOI: 10.1016/0006-8993(95)01469-1] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Previous studies have reported a neuromodulatory effect of brain-derived neurotrophic factor (BDNF) on serotonin neurons in the central nervous system. In the present study, we examined the effects of local infusion of BDNF on the electrophysiological activity of serotonergic neurons in the rat dorsal raphé nucleus with extracellular single unit recording in vivo. Compared with vehicle-infused rats, chronic administration of BDNF (10-14 days) caused serotonergic neurons to fire in a significantly less regular pattern, without altering the mean firing rate or other measures of electrical activity. These results suggest that the ability of similar infusions of BDNF to produce behavioral effects (i.e. analgesia and an antidepressant-like effect) associated with elevated serotonin turnover may be in part the result of more irregular firing patterns of dorsal raphé neurons.
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Affiliation(s)
- P Celada
- Center for Molecular and Behavioral Neuroscience, Rutgers, State University of New Jersey, Newark 07102, USA.
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41
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Abstract
Doxorubicin (D) is one of the most active agents in the treatment of breast cancer but can be associated with cardiotoxicity (CT) and febrile neutropenia (FN). Epirubicin, a stereoisomer of doxorubicin, is reported to have similar efficacy but reduced toxicity. A retrospective chart audit was performed to estimate the incidence, average length of hospitalisation and resource consumption for the management of CT and FN in 200 patients breast cancer patients receiving equidoses of doxorubicin or epirubicin. Overall, there were three more episodes of CT in the doxorubicin group than in epirubicin patients (five versus two) at a cost of Canadian dollars C$4268/episode. With regard to FN, there were 11 more episodes in the doxorubicin arm (25 versus 14) at a cost of C$5419/episode. The results of the study support the substitution of equidose epirubicin for doxorubicin in women undergoing treatment for malignancies of the breast. Such a policy may result in reduced toxicity-related management costs.
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Affiliation(s)
- G Dranitsaris
- Department of Pharmaceutical Services, Ontario Cancer Institute/Princess Margaret Hospital, Toronto, Ontario, Canada
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42
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Abstract
Nerve growth factor (NGF) supports the survival and biosynthetic activities of basal forebrain cholinergic neurons and is expressed by neurons within lateral aspects of this system including the horizontal limb of the diagonal bands and magnocellular preoptic areas. In the present study, colormetric and isotopic in situ hybridization techniques were combined to identify the neurotransmitter phenotype of the NGF-producing cells in these two areas. Adult rat forebrain tissue was processed for the colocalization of mRNA for NGF with mRNA for either choline acetyltransferase, a cholinergic cell marker, or glutamic acid decarboxylase, a GABAergic cell marker. In both regions, many neurons were single-labeled for choline acetyltransferase mRNA, but cells containing both choline acetyltransferase and NGF mRNA were not detected. In these fields, virtually all NGF mRNA-positive neurons contained glutamic acid decarboxylase mRNA. The double-labeled cells comprised a subpopulation of GABAergic neurons; numerous cells labeled with glutamic acid decarboxylase cRNA alone were codistributed with the double-labeled neurons. These data demonstrate that in basal forebrain GABAergic neurons are the principal source of locally produced NGF.
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Affiliation(s)
- J C Lauterborn
- Department of Anatomy and Neurobiology, University of California, Irvine 92717-1275, USA
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Whaley DR, Tran MQ, Alberti S, Tran TM, Antonsen TM, Tran C. Startup methods for single-mode gyrotron operation. Phys Rev Lett 1995; 75:1304-1307. [PMID: 10060259 DOI: 10.1103/physrevlett.75.1304] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Dranitsaris G, Tran TM, McGeer A, Narine L. Pharmacoeconomic analysis of empirical therapy with ceftazidime alone or combination antibiotics for febrile neutropenia in cancer patients. Pharmacoeconomics 1995; 7:49-62. [PMID: 10155293 DOI: 10.2165/00019053-199507010-00006] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
There is evidence to suggest that single-agent broad spectrum antibacterials may be cost-effective alternatives to combination antibiotics for the empirical management of febrile neutropenia in cancer patients. The objectives of the present study were 2-fold. The first objective was to compare the clinical effectiveness of ceftazidime monotherapy with that of 2 combination antibiotic regimens in cancer patients with febrile neutropenia. The 2 comparator regimens consisted of tobramycin plus piperacillin, either with (regimen 'CAP') or without (regimen 'AP') cefazolin. The second objective was to perform a cost-effectiveness analysis of the 3 regimens. Meta-analysis of randomised comparative trials between the 3 therapy groups was performed to determine the average overall response rate after 3 to 5 days of treatment. Seven clinical studies were selected for analysis. The overall incidence of adverse drug reactions (ADRs) was determined using the results of comparative and noncomparative studies. A comparative cost-analytic model was applied from a hospital perspective. The costs of primary therapy, hospitalisation, laboratory tests, routine patient care and treating ADRs were calculated, as were future costs. Monotherapy with ceftazidime was associated with an overall response rate of 63.5% and mean per-patient costs of $Can12,000 to $Can14,000. In comparison, regimen AP was associated with an overall response rate of 58.8% and mean costs of $Can13,000 to $Can16,000 per patient. The overall response rate in patients receiving CAP was 75.3%, and the mean cost per patient was $Can11,000 to $Can12,000. Thus, regimen CAP was the most cost-effective therapy from a hospital perspective.
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Affiliation(s)
- G Dranitsaris
- Department of Pharmacy, Ontario Cancer Institute/Princess Margaret Hospital, Toronto, Canada
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Seroogy KB, Lundgren KH, Tran TM, Guthrie KM, Isackson PJ, Gall CM. Dopaminergic neurons in rat ventral midbrain express brain-derived neurotrophic factor and neurotrophin-3 mRNAs. J Comp Neurol 1994; 342:321-34. [PMID: 7912699 DOI: 10.1002/cne.903420302] [Citation(s) in RCA: 244] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Studies of the trophic activities of brain-derived neurotrophic factor and neurotrophin-3 indicate that both molecules support the survival of a number of different embryonic cell types in culture. We have shown that mRNAs for brain-derived neurotrophic factor and neurotrophin-3 are localized to specific ventral mesencephalic regions containing dopaminergic cell bodies, including the substantia nigra and ventral tegmental area. In the present study, in situ hybridization with 35S-labeled cRNA probes for the neurotrophin mRNAs was combined with neurotoxin lesions or with immunocytochemistry for the catecholamine-synthesizing enzyme tyrosine hydroxylase to determine whether the dopaminergic neurons, themselves, synthesize the neurotrophins in adult rat midbrain. Following unilateral destruction of the midbrain dopamine cells with 6-hydroxydopamine, a substantial, but incomplete, depletion of brain-derived neurotrophic factor and neurotrophin-3 mRNA-containing cells was observed in the ipsilateral substantia nigra pars compacta and ventral tegmental area. In other rats, combined in situ hybridization and tyrosine hydroxylase immunocytochemistry demonstrated that the vast majority of the neurotrophin mRNA-containing neurons in the substantia nigra and ventral tegmental area were tyrosine hydroxylase immunoreactive. Of the total population of tyrosine hydroxylase-positive cells, double-labeled neurons constituted 25-50% in the ventral tegmental area and 10-30% in the substantia nigra pars compacta, with the proportion being greater in medial pars compacta. In addition, tyrosine hydroxylase/neurotrophin mRNA coexistence was observed in neurons in other mesencephalic regions including the retrorubral field, interfascicular nucleus, rostral and central linear nuclei, dorsal raphe nucleus, and supramammillary region. The present results demonstrate brain-derived neurotrophic factor and neurotrophin-3 expression by adult midbrain dopamine neurons and support the suggestion that these neurotrophins influence dopamine neurons via autocrine or paracrine mechanisms. These data raise the additional possibility that inappropriate expression of the neurotrophins by dopaminergic neurons could contribute to the neuropathology of disease states such as Parkinson's disease and schizophrenia.
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Affiliation(s)
- K B Seroogy
- Department of Anatomy and Neurobiology, University of Kentucky, Lexington 40536
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46
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Abstract
Isotopic and colorimetric in situ hybridization techniques were combined to determine if nerve growth factor (NGF) mRNA is colocalized with mRNA for the GABA biosynthetic enzyme glutamic acid decarboxylase (GAD) in adult rat hippocampus. Quantification of neurons labeled with both 35S-labeled GAD67 mRNA and digoxigenin-labeled NGF cRNA determined that of the NGF cRNA-labeled neurons, 97% within regions CA3-CA1, and 88% within the hilus, were also labeled with GAD67 cRNA. Overall, 47% of the total population of GAD67 cRNA labeled cells were NGF cRNA positive. The greater portion of stratum granulosum was lightly labeled by the NGF cRNA alone. The results indicate that, excepting stratum granulosum, NGF is predominantly synthesized by GABAergic neurons in rat hippocampus.
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Affiliation(s)
- J C Lauterborn
- Department of Anatomy and Neurobiology, University of California, Irvine 92715
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Frischknecht A, Stehling W, Strassner G, Truöl P, Alder JC, Joseph C, Loude JF, Perroud JP, Ruegger D, Tran TM, Dahme W, Panke H, Kopp R. Radiative muon absorption in calcium. Phys Rev C Nucl Phys 1985; 32:1506-1520. [PMID: 9953006 DOI: 10.1103/physrevc.32.1506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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