1
|
Paucar O, Meza ZMA, Escobar BP, Pancorbo EP, Risco-Castillo M, Chalco RC, Calcina CSG, Galvez AG, Montoya M, Ccoscco AEG, Hernandez J, Roa DE. Feasibility of Acquiring Radiotherapy Linac Commissioning Data with a Three-Dimensional Cubic Electronic Detector Array. Int J Radiat Oncol Biol Phys 2023; 117:e713. [PMID: 37786086 DOI: 10.1016/j.ijrobp.2023.06.2213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) Linac commissioning data acquisition consists of measurements of PDDs/TMRs, profiles, and dosimetric factors done in water and lasting several weeks to complete. Data collected with an early prototype 3D cubic electronic detector suggests faster, reliable, accurate, and a cost-effective option for commissioning data collection in the future. MATERIALS/METHODS A 10 × 10 × 15 cm3 3D cubic electronic detector array prototype of acrylic, silicon rubber, and five 10 × 10 × 0.2 cm3 planar active matrices at 2.0, 4.0, 6.0, 8.0, and 10 cm depths, was constructed. Each active matrix has 25 pixels (diode, capacitor, MOSFET) of 2.0 cm separation in a 10 × 10 cm2 active area resulting in 125 pixels in the array. Data readout consists of a multiplex connectivity configuration where one channel provides data input/output to multiple pixels rather than one channel per pixel. Simultaneous absolute depth-dose (ADD) and profile measurements were performed using a 6 MV photon beam, 100 cm SSD, 10 × 10 cm2 open field, 100 MU, and 400 MU/min, without scanning. Also, ADDs and profiles were measured with 15-, 30- and 45-deg wedges. Data processing for these measurements, and 2D and 3D DD and profile displays, were done in a programming environment, and results were compared to calculated data in acrylic. RESULTS Table with ADD and profile results for the 10 × 10 cm2 open field. ADD and profiles with wedges showed similar results. CONCLUSION Absolute depth-dose and profile data acquired with an early prototype agreed within ±4 % of calculated values. This suggests that an improved 3D cubic electronic detector array could be used for commissioning data collection. If realized, it could reduce commissioning time from weeks to hours saving cost, staff time, and leveraging a new Linac into clinical operations sooner.
Collapse
Affiliation(s)
- O Paucar
- Universidad Nacional de Ingenieria, Lima, Peru
| | | | | | | | | | | | | | - A Gonzales Galvez
- Universidad Tecnologica del Peru, Lima, Peru; Aliada Centro Oncologico, Lima, Peru
| | - M Montoya
- Universidad Nacional de Ingenieria, Lima, Peru
| | | | | | - D E Roa
- Leonard Cancer Institute - Radiation Oncology, Mission Viejo, CA
| |
Collapse
|
2
|
Caldas B, Thieme ML, Shahbol N, Coelho ME, Grill G, Van Damme PA, Aranha R, Cañas C, Fagundes CK, Franco‐León N, Herrera‐Collazos EE, Jézéquel C, Montoya M, Mosquera‐Guerra F, Oliveira‐da‐Costa M, Paschoalini M, Petry P, Oberdorff T, Trujillo F, Tedesco PA, de Brito Ribeiro MCL. Identifying the current and future status of freshwater connectivity corridors in the Amazon Basin. Conservat Sci and Prac 2022. [DOI: 10.1111/csp2.12853] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Affiliation(s)
| | | | | | | | | | | | | | - Carlos Cañas
- Bureau of Water Resource Information St. Johns River Water Management District Palatka Florida USA
| | - Camila K. Fagundes
- Wildlife Conservation Society (former) Brasilia Brazil
- Universidade Federal do Pampa (current) Uruguaiana, Rio Grande do Sul Brazil
| | | | | | - Céline Jézéquel
- Evolution et diversite biologique, UMR EDB, CNRS 5174, IRD253, UPS Toulouse France
| | | | | | | | - Mariana Paschoalini
- Aqualie Institute and Laboratory of Ecological Behavior and Bioacoutics of the Federal University of Juiz de Fora Juiz de Fora Minas Gerais Brazil
| | - Paulo Petry
- The Nature Conservancy, Latin America Freshwater Unit Hollis New Hampshire USA
| | - Thierry Oberdorff
- Evolution et diversite biologique, UMR EDB, CNRS 5174, IRD253, UPS Toulouse France
| | | | - Pablo A. Tedesco
- Evolution et diversite biologique, UMR EDB, CNRS 5174, IRD253, UPS Toulouse France
| | | |
Collapse
|
3
|
Sanluis-Verdes A, Colomer-Vidal P, Rodriguez-Ventura F, Bello-Villarino M, Spinola-Amilibia M, Ruiz-Lopez E, Illanes-Vicioso R, Castroviejo P, Aiese Cigliano R, Montoya M, Falabella P, Pesquera C, Gonzalez-Legarreta L, Arias-Palomo E, Solà M, Torroba T, Arias CF, Bertocchini F. Wax worm saliva and the enzymes therein are the key to polyethylene degradation by Galleria mellonella. Nat Commun 2022; 13:5568. [PMID: 36195604 PMCID: PMC9532405 DOI: 10.1038/s41467-022-33127-w] [Citation(s) in RCA: 38] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Accepted: 09/02/2022] [Indexed: 11/20/2022] Open
Abstract
Plastic degradation by biological systems with re-utilization of the by-products could be a future solution to the global threat of plastic waste accumulation. Here, we report that the saliva of Galleria mellonella larvae (wax worms) is capable of oxidizing and depolymerizing polyethylene (PE), one of the most produced and sturdy polyolefin-derived plastics. This effect is achieved after a few hours’ exposure at room temperature under physiological conditions (neutral pH). The wax worm saliva can overcome the bottleneck step in PE biodegradation, namely the initial oxidation step. Within the saliva, we identify two enzymes, belonging to the phenol oxidase family, that can reproduce the same effect. To the best of our knowledge, these enzymes are the first animal enzymes with this capability, opening the way to potential solutions for plastic waste management through bio-recycling/up-cycling. The crucial first step in the biodegradation of polyethylene plastic is oxidation of the polymer. This has traditionally required abiotic pre-treatment, but now Bertocchini and colleagues report two wax worm enzymes capable of catalyzing this oxidation and subsequent degradation at room temperature.
Collapse
Affiliation(s)
- A Sanluis-Verdes
- Centro de Investigaciones Biologicas-Margarita Salas (CIB)-Consejo Superior de Investigaciones Cientificas (CSIC), Department of Plant and Microbial Biology, Madrid, Spain
| | - P Colomer-Vidal
- Centro de Investigaciones Biologicas-Margarita Salas (CIB)-Consejo Superior de Investigaciones Cientificas (CSIC), Department of Plant and Microbial Biology, Madrid, Spain
| | - F Rodriguez-Ventura
- Centro de Investigaciones Biologicas-Margarita Salas (CIB)-Consejo Superior de Investigaciones Cientificas (CSIC), Department of Plant and Microbial Biology, Madrid, Spain
| | - M Bello-Villarino
- Centro de Investigaciones Biologicas-Margarita Salas (CIB)-Consejo Superior de Investigaciones Cientificas (CSIC), Department of Plant and Microbial Biology, Madrid, Spain
| | | | - E Ruiz-Lopez
- Department of Structural Biology, Molecular Biology Institute of Barcelona (IBMB)-CSIC, Barcelona, Spain
| | - R Illanes-Vicioso
- Department of Structural Biology, Molecular Biology Institute of Barcelona (IBMB)-CSIC, Barcelona, Spain
| | - P Castroviejo
- Department of Chemistry, Faculty of Science and PCT, University of Burgos, Burgos, Spain
| | | | - M Montoya
- CIB-CSIC, Department of Molecular Biomedicine, Madrid, Spain
| | - P Falabella
- Department of Sciences, University of Basilicata, Potenza, Italy
| | - C Pesquera
- Department of Chemistry and Process & Resource Engineering, Inorganic Chemistry Group-University of Cantabria, Nanomedicine-IDIVAL, Santander, Spain
| | - L Gonzalez-Legarreta
- Department of Chemistry and Process & Resource Engineering, Inorganic Chemistry Group-University of Cantabria, Nanomedicine-IDIVAL, Santander, Spain
| | - E Arias-Palomo
- CIB-CSIC, Department of Structural and Chemical Biology, Madrid, Spain
| | - M Solà
- Department of Structural Biology, Molecular Biology Institute of Barcelona (IBMB)-CSIC, Barcelona, Spain
| | - T Torroba
- Department of Chemistry, Faculty of Science and PCT, University of Burgos, Burgos, Spain
| | - C F Arias
- Centro de Investigaciones Biologicas-Margarita Salas (CIB)-Consejo Superior de Investigaciones Cientificas (CSIC), Department of Plant and Microbial Biology, Madrid, Spain.
| | - F Bertocchini
- Centro de Investigaciones Biologicas-Margarita Salas (CIB)-Consejo Superior de Investigaciones Cientificas (CSIC), Department of Plant and Microbial Biology, Madrid, Spain.
| |
Collapse
|
4
|
Flecker AS, Shi Q, Almeida RM, Angarita H, Gomes-Selman JM, García-Villacorta R, Sethi SA, Thomas SA, Poff NL, Forsberg BR, Heilpern SA, Hamilton SK, Abad JD, Anderson EP, Barros N, Bernal IC, Bernstein R, Cañas CM, Dangles O, Encalada AC, Fleischmann AS, Goulding M, Higgins J, Jézéquel C, Larson EI, McIntyre PB, Melack JM, Montoya M, Oberdorff T, Paiva R, Perez G, Rappazzo BH, Steinschneider S, Torres S, Varese M, Walter MT, Wu X, Xue Y, Zapata-Ríos XE, Gomes CP. Reducing adverse impacts of Amazon hydropower expansion. Science 2022; 375:753-760. [PMID: 35175810 DOI: 10.1126/science.abj4017] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Proposed hydropower dams at more than 350 sites throughout the Amazon require strategic evaluation of trade-offs between the numerous ecosystem services provided by Earth's largest and most biodiverse river basin. These services are spatially variable, hence collective impacts of newly built dams depend strongly on their configuration. We use multiobjective optimization to identify portfolios of sites that simultaneously minimize impacts on river flow, river connectivity, sediment transport, fish diversity, and greenhouse gas emissions while achieving energy production goals. We find that uncoordinated, dam-by-dam hydropower expansion has resulted in forgone ecosystem service benefits. Minimizing further damage from hydropower development requires considering diverse environmental impacts across the entire basin, as well as cooperation among Amazonian nations. Our findings offer a transferable model for the evaluation of hydropower expansion in transboundary basins.
Collapse
Affiliation(s)
- Alexander S Flecker
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA
| | - Qinru Shi
- Institute for Computational Sustainability, Cornell University, Ithaca, NY 14853, USA
| | - Rafael M Almeida
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA.,Department of Natural Resources and the Environment, Cornell University, Ithaca, NY 14853, USA
| | - Héctor Angarita
- Northern Andes and South Central America Conservation Program, The Nature Conservancy, Bogotá 110231, Colombia.,Stockholm Environment Institute Latin America, Bogotá 110231, Colombia.,Department of Biology, Stanford University, Palo Alto, CA 94305, USA
| | | | - Roosevelt García-Villacorta
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA.,Centro Peruano para la Biodiversidad y Conservación, Iquitos 16001, Perú
| | - Suresh A Sethi
- Department of Natural Resources and the Environment, Cornell University, Ithaca, NY 14853, USA
| | - Steven A Thomas
- School of Natural Resources, University of Nebraska, Lincoln, NE 68583, USA
| | - N LeRoy Poff
- Department of Biology, Colorado State University, Fort Collins, CO 80523, USA.,Institute for Applied Ecology, University of Canberra, Bruce, ACT 2617, Australia
| | - Bruce R Forsberg
- National Institute of Amazonian Research, Manaus 69060-001, Brazil.,Vermont Department of Environmental Conservation, Montpelier, VT 05620, USA
| | - Sebastian A Heilpern
- Department of Natural Resources and the Environment, Cornell University, Ithaca, NY 14853, USA.,Department of Ecology, Evolution and Environmental Biology, Columbia University, New York, NY 10027, USA
| | - Stephen K Hamilton
- W.K. Kellogg Biological Station and Department of Integrative Biology, Michigan State University, Hickory Corners, MI 49060, USA.,Cary Institute of Ecosystem Studies, Millbrook, NY 12545, USA
| | - Jorge D Abad
- Centro de Investigación y Tecnología del Agua, Universidad de Ingeniería y Tecnología, Lima 15063, Peru
| | - Elizabeth P Anderson
- Department of Earth and Environment and Institute of Environment, Florida International University, Miami, FL 33199, USA
| | - Nathan Barros
- Department of Biology, Federal University of Juiz de Fora, Juiz de Fora 36036-900, Brazil
| | | | - Richard Bernstein
- Institute for Computational Sustainability, Cornell University, Ithaca, NY 14853, USA.,Department of Computer Science, Cornell University, Ithaca, NY 14853, USA
| | | | - Olivier Dangles
- Centre d'Ecologie Fonctionnelle et Evolutive, Université de Montpellier, UMR 5175, CNRS, Université Paul Valéry Montpellier, EPHE, IRD, F-34293 Montpellier, France
| | - Andrea C Encalada
- Laboratorio de Ecología Acuática, Instituto BIOSFERA, Universidad San Francisco de Quito, Quito 170150, Ecuador
| | - Ayan S Fleischmann
- Institute of Hydraulic Research, Federal University of Rio Grande do Sul, Porto Alegre 91501-970, Brazil
| | | | | | - Céline Jézéquel
- UMR EDB (Laboratoire Évolution et Diversité Biologique), CNRS 5174, IRD253, UPS, F-31062 Toulouse, France
| | - Erin I Larson
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY 14853, USA.,Institute for Culture and Environment, Alaska Pacific University, Anchorage, AK 99508, USA
| | - Peter B McIntyre
- Department of Natural Resources and the Environment, Cornell University, Ithaca, NY 14853, USA
| | - John M Melack
- Bren School of Environmental Science and Management, University of California at Santa Barbara, Santa Barbara, CA 93106, USA
| | | | - Thierry Oberdorff
- UMR EDB (Laboratoire Évolution et Diversité Biologique), CNRS 5174, IRD253, UPS, F-31062 Toulouse, France
| | - Rodrigo Paiva
- Institute of Hydraulic Research, Federal University of Rio Grande do Sul, Porto Alegre 91501-970, Brazil
| | - Guillaume Perez
- Institute for Computational Sustainability, Cornell University, Ithaca, NY 14853, USA
| | - Brendan H Rappazzo
- Institute for Computational Sustainability, Cornell University, Ithaca, NY 14853, USA.,Department of Computer Science, Cornell University, Ithaca, NY 14853, USA
| | - Scott Steinschneider
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Sandra Torres
- Departamento de Ingeniería Civil y Ambiental, Escuela Politécnica Nacional, Quito 170143, Ecuador.,Centro de Investigaciones y Estudios en Recursos Hídricos, Escuela Politécnica Nacional, Quito 170143, Ecuador
| | | | - M Todd Walter
- Department of Biological and Environmental Engineering, Cornell University, Ithaca, NY 14853, USA
| | - Xiaojian Wu
- Institute for Computational Sustainability, Cornell University, Ithaca, NY 14853, USA
| | - Yexiang Xue
- Institute for Computational Sustainability, Cornell University, Ithaca, NY 14853, USA.,Department of Computer Science, Cornell University, Ithaca, NY 14853, USA.,Department of Computer Science, Purdue University, West Lafayette, IN 47907, USA
| | - Xavier E Zapata-Ríos
- Departamento de Ingeniería Civil y Ambiental, Escuela Politécnica Nacional, Quito 170143, Ecuador.,Centro de Investigaciones y Estudios en Recursos Hídricos, Escuela Politécnica Nacional, Quito 170143, Ecuador
| | - Carla P Gomes
- Institute for Computational Sustainability, Cornell University, Ithaca, NY 14853, USA.,Department of Computer Science, Cornell University, Ithaca, NY 14853, USA
| |
Collapse
|
5
|
Roa D, Leon S, Paucar O, Gonzales A, Schwarz B, Olguin E, Moskvin V, Alva-Sanchez M, Glassell M, Correa N, Moyses H, Shankar A, Hamrick B, Sarria GR, Li B, Tajima T, Necas A, Guzman C, Challco R, Montoya M, Meza Z, Zapata M, Gonzales A, Marquez F, Neira R, Vilca W, Mendez J, Hernandez J. Monte Carlo simulations and phantom validation of low-dose radiotherapy to the lungs using an interventional radiology C-arm fluoroscope. Phys Med 2021; 94:24-34. [PMID: 34979431 DOI: 10.1016/j.ejmp.2021.12.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/30/2021] [Accepted: 12/27/2021] [Indexed: 11/26/2022] Open
Abstract
PURPOSE To use MC simulations and phantom measurements to investigate the dosimetry of a kilovoltage x-ray beam from an IR fluoroscope to deliver low-dose (0.3-1.0 Gy) radiotherapy to the lungs. MATERIALS AND METHODS PENELOPE was used to model a 125 kV, 5.94 mm Al HVL x-ray beam produced by a fluoroscope. The model was validated through depth-dose, in-plane/cross-plane profiles and absorbed dose at 2.5-, 5.1-, 10.2- and 15.2-cm depths against the measured beam in an acrylic phantom. CT images of an anthropomorphic phantom thorax/lungs were used to simulate 0.5 Gy dose distributions for PA, AP/PA, 3-field and 4-field treatments. DVHs were generated to assess the dose to the lungs and nearby organs. Gafchromic film was used to measure doses in the phantom exposed to PA and 4-field treatments, and compared to the MC simulations. RESULTS Depth-dose and profile results were within 3.2% and 7.8% of the MC data uncertainty, respectively, while dose gamma analysis ranged from 0.7 to 1.0. Mean dose to the lungs were 1.1-, 0.8-, 0.9-, and 0.8- Gy for the PA, AP/PA, 3-field, and 4-field after isodose normalization to cover ∼ 95% of each lung volume. Skin dose toxicity was highest for the PA and lowest for the 4-field, and both arrangements successfully delivered the treatment on the phantom. However, the dose distribution for the PA was highly non-uniform and produced skin doses up to 4 Gy. The dose distribution for the 4-field produced a uniform 0.6 Gy dose throughout the lungs, with a maximum dose of 0.73 Gy. The average percent difference between experimental and Monte Carlo values were -0.1% (range -3% to +4%) for the PA treatment and 0.3% (range -10.3% to +15.2%) for the 4-field treatment. CONCLUSION A 125 kV x-ray beam from an IR fluoroscope delivered through two or more fields can deliver an effective low-dose radiotherapy treatment to the lungs. The 4-field arrangement not only provides an effective treatment, but also significant dose sparing to healthy organs, including skin, compared to the PA treatment. Use of fluoroscopy appears to be a viable alternative to megavoltage radiation therapy equipment for delivering low-dose radiotherapy to the lungs.
Collapse
Affiliation(s)
- D Roa
- Department of Radiation Oncology, University of California, Irvine Health, Orange, CA 92868, USA.
| | - S Leon
- Department of Radiology, University of Florida, Gainesville, FL 32610, USA
| | - O Paucar
- Facultad de Ingenieria Electrica y Electronica, Universidad Nacional de Ingenieria, Lima, Peru
| | - A Gonzales
- Facultad de Ciencias, Universidad Nacional de Ingenieria, Lima, Peru
| | - B Schwarz
- Department of Radiology, University of Florida, Gainesville, FL 32610, USA
| | - E Olguin
- Department of Radiology, University of Florida, Gainesville, FL 32610, USA
| | - V Moskvin
- Department of Radiation Oncology, St. Judes Children's Research Hospital, Memphis, TN 38105, USA
| | - M Alva-Sanchez
- Department of Exact and Applied Sciences, University of Health Sciences of Porto Alegre, Porto Alegre, Brazil
| | - M Glassell
- Department of Radiology, University of Florida, Gainesville, FL 32610, USA
| | - N Correa
- Department of Radiology, University of Florida, Gainesville, FL 32610, USA
| | - H Moyses
- Department of Radiation Oncology, University of California, Irvine Health, Orange, CA 92868, USA
| | - A Shankar
- Department of Radiology, University of Florida, Gainesville, FL 32610, USA
| | - B Hamrick
- Environmental Health and Safety, University of California, Irvine Health, Orange, CA 92868, USA
| | - G R Sarria
- University Hospital Bonn, Department of Radiation Oncology, University of Bonn, Bonn, Germany
| | - B Li
- Department of Radiation Oncology, University of California, San Francisco, CA 94115, USA
| | - T Tajima
- Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
| | - A Necas
- TAE Technologies, 1961 Pauling, Foothill Ranch, CA 92610, USA
| | - C Guzman
- Facultad de Medicina Humana, Universidad Ricardo Palma, Lima, Peru
| | - R Challco
- Facultad de Ciencias, Universidad Nacional de Ingenieria, Lima, Peru
| | - M Montoya
- Facultad de Ciencias, Universidad Nacional de Ingenieria, Lima, Peru
| | - Z Meza
- Facultad de Ciencias, Universidad Nacional de Ingenieria, Lima, Peru
| | - M Zapata
- Facultad de Ciencias, Universidad Nacional de Ingenieria, Lima, Peru
| | - A Gonzales
- Clinica Aliada contra el Cancer, Lima, Peru
| | - F Marquez
- Facultad de Ciencias Físicas, Universidad Nacional Mayor de San Marcos, Lima, Peru
| | - R Neira
- Instituto Nacional de Enfermedades Neoplasicas, Lima, Peru
| | - W Vilca
- Instituto Nacional de Enfermedades Neoplasicas, Lima, Peru
| | - J Mendez
- Facultad de Ciencias Naturales y Matemática, Universidad Nacional del Callao, Callao, Peru
| | - J Hernandez
- HRS Oncology International, Las Vegas, NV 89119, USA
| |
Collapse
|
6
|
Avila M, Montoya M, Lumia C, Marson A, Brandão L, Tomlinson G. Compression stockings to prevent post-thrombotic syndrome in adults, a Bayesian meta-analysis. Thromb Res 2019; 182:20-26. [DOI: 10.1016/j.thromres.2019.08.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 07/26/2019] [Accepted: 08/10/2019] [Indexed: 02/07/2023]
|
7
|
Almeida RM, Shi Q, Gomes-Selman JM, Wu X, Xue Y, Angarita H, Barros N, Forsberg BR, García-Villacorta R, Hamilton SK, Melack JM, Montoya M, Perez G, Sethi SA, Gomes CP, Flecker AS. Reducing greenhouse gas emissions of Amazon hydropower with strategic dam planning. Nat Commun 2019; 10:4281. [PMID: 31537792 PMCID: PMC6753097 DOI: 10.1038/s41467-019-12179-5] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [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: 04/11/2019] [Accepted: 08/21/2019] [Indexed: 11/09/2022] Open
Abstract
Hundreds of dams have been proposed throughout the Amazon basin, one of the world's largest untapped hydropower frontiers. While hydropower is a potentially clean source of renewable energy, some projects produce high greenhouse gas (GHG) emissions per unit electricity generated (carbon intensity). Here we show how carbon intensities of proposed Amazon upland dams (median = 39 kg CO2eq MWh-1, 100-year horizon) are often comparable with solar and wind energy, whereas some lowland dams (median = 133 kg CO2eq MWh-1) may exceed carbon intensities of fossil-fuel power plants. Based on 158 existing and 351 proposed dams, we present a multi-objective optimization framework showing that low-carbon expansion of Amazon hydropower relies on strategic planning, which is generally linked to placing dams in higher elevations and smaller streams. Ultimately, basin-scale dam planning that considers GHG emissions along with social and ecological externalities will be decisive for sustainable energy development where new hydropower is contemplated.
Collapse
Affiliation(s)
- Rafael M Almeida
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, 14853, USA.
| | - Qinru Shi
- Cornell University, Institute for Computational Sustainability, Ithaca, NY, 14853, USA
| | | | - Xiaojian Wu
- Cornell University, Institute for Computational Sustainability, Ithaca, NY, 14853, USA
- Microsoft AI & Research, Sunnyvale, CA, USA
| | - Yexiang Xue
- Cornell University, Institute for Computational Sustainability, Ithaca, NY, 14853, USA
- Department of Computer Science, Purdue University, West Lafayette, IN, USA
| | - Hector Angarita
- Stockholm Environment Institute Latin America, Bogota, 110231, Colombia
| | - Nathan Barros
- Department of Biology, Federal University of Juiz de Fora, Juiz de Fora, 36036-900, Brazil
| | - Bruce R Forsberg
- National Institute of Amazonian Research (INPA), Manaus, 69060-001, Brazil
| | | | - Stephen K Hamilton
- W.K. Kellogg Biological Station and Department of Integrative Biology, Michigan State University, Hickory Corners, MI, 49060, USA
- Cary Institute of Ecosystem Studies, Millbrook, NY, 12545, USA
| | - John M Melack
- Bren School of Environmental Science and Management, University of California at Santa Barbara, Santa Barbara, CA, 93106, USA
| | | | - Guillaume Perez
- Cornell University, Institute for Computational Sustainability, Ithaca, NY, 14853, USA
| | - Suresh A Sethi
- USGS New York Cooperative Fish and Wildlife Research Unit, Department of Natural Resources, Cornell University, Ithaca, NY, 14853, USA
| | - Carla P Gomes
- Cornell University, Institute for Computational Sustainability, Ithaca, NY, 14853, USA.
| | - Alexander S Flecker
- Department of Ecology and Evolutionary Biology, Cornell University, Ithaca, NY, 14853, USA.
| |
Collapse
|
8
|
Bello I, Coll E, Sandiumenge A, Romero L, Jauregui A, Pérez J, Ochoa J, Peñafiel S, Sánchez L, Ascanio F, Montoya M, Ginés ES, Sacanell J, Berastegui C, Vázquez C, Arcos IL, Deu M. Do the Pretransplant Use of Statins in a Recipient Reduce the Incidence of Primary Graft Dysfunction after Lung Transplant? J Heart Lung Transplant 2019. [DOI: 10.1016/j.healun.2019.01.554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
|
9
|
Anderson EP, Jackson S, Tharme RE, Douglas M, Flotemersch JE, Zwarteveen M, Lokgariwar C, Montoya M, Wali A, Tipa GT, Jardine TD, Olden JD, Cheng L, Conallin J, Cosens B, Dickens C, Garrick D, Groenfeldt D, Kabogo J, Roux DJ, Ruhi A, Arthington AH. Understanding rivers and their social relations: A critical step to advance environmental water management. WIREs Water 2019; 6:10.1002/wat2.1381. [PMID: 31827789 PMCID: PMC6905518 DOI: 10.1002/wat2.1381] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Accepted: 08/04/2019] [Indexed: 05/31/2023]
Abstract
River flows connect people, places, and other forms of life, inspiring and sustaining diverse cultural beliefs, values, and ways of life. The concept of environmental flows provides a framework for improving understanding of relationships between river flows and people, and for supporting those that are mutually beneficial. Nevertheless, most approaches to determining environmental flows remain grounded in the biophysical sciences. The newly revised Brisbane Declaration and Global Action Agenda on Environmental Flows (2018) represents a new phase in environmental flow science and an opportunity to better consider the co-constitution of river flows, ecosystems, and society, and to more explicitly incorporate these relationships into river management. We synthesize understanding of relationships between people and rivers as conceived under the renewed definition of environmental flows. We present case studies from Honduras, India, Canada, New Zealand, and Australia that illustrate multidisciplinary, collaborative efforts where recognizing and meeting diverse flow needs of human populations was central to establishing environmental flow recommendations. We also review a small body of literature to highlight examples of the diversity and interdependencies of human-flow relationships-such as the linkages between river flow and human well-being, spiritual needs, cultural identity, and sense of place-that are typically overlooked when environmental flows are assessed and negotiated. Finally, we call for scientists and water managers to recognize the diversity of ways of knowing, relating to, and utilizing rivers, and to place this recognition at the center of future environmental flow assessments. This article is categorized under: Water and Life > Conservation, Management, and Awareness Human Water > Water Governance Human Water > Water as Imagined and Represented.
Collapse
Affiliation(s)
- Elizabeth P. Anderson
- Department of Earth and Environment and Institute for Water and Environment, Florida International University, Miami, Florida, USA
| | - Sue Jackson
- Australian Rivers Institute, Griffith University, Nathan, Queensland, Australia
| | - Rebecca E. Tharme
- Australian Rivers Institute, Griffith University, Nathan, Queensland, Australia
- Riverfutures Ltd, Buxton, UK
| | - Michael Douglas
- University of Western Australia, Perth, Western Australia, Australia
- Research Institute for the Environment and Livelihoods, Charles Darwin University, Darwin, Australia
| | - Joseph E. Flotemersch
- U.S. Environmental Protection Agency, Office of Research and Development, Cincinnati, Ohio, USA
| | - Margreet Zwarteveen
- IHE-Delft Institute for Water Education, Delft, the Netherlands
- Amsterdam Institute for Social Science Research, University of Amsterdam, Amsterdam, the Netherlands
| | | | | | - Alaka Wali
- Integrated Research Center, The Field Museum, Chicago, Illinois, USA
| | - Gail T. Tipa
- (Ngai Tahu) Tipa and Associates Ltd, East Taieri, New Zealand
| | - Timothy D. Jardine
- School of Environment and Sustainability, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Julian D. Olden
- School of Aquatic and Fishery Sciences, University of Washington, Seattle, Washington, USA
| | - Lin Cheng
- Water Practice, Worldwide Fund for Nature (WWF-China), Beijing, China
| | - John Conallin
- Institute of Land, Water and Society, Charles Sturt University, Albury, New South Wales, Australia
| | | | - Chris Dickens
- International Water Management Institute, Pretoria, South Africa
| | - Dustin Garrick
- School of Enterprise and the Environment, University of Oxford, Oxford, UK
| | | | - Jane Kabogo
- Ministry of Water and Irrigation, United Republic of Tanzania, Dodoma, Tanzania
| | - Dirk J. Roux
- Scientific Services, South African National Parks, George, South Africa
- Sustainability Research Unit, Nelson Mandela University, George, South Africa
| | - Albert Ruhi
- Department of Environmental Science, Policy, and Management, University of California, Berkeley, California, USA
| | | |
Collapse
|
10
|
Sánchez-Cordón PJ, Montoya M, Reis AL, Dixon LK. African swine fever: A re-emerging viral disease threatening the global pig industry. Vet J 2018; 233:41-48. [PMID: 29486878 PMCID: PMC5844645 DOI: 10.1016/j.tvjl.2017.12.025] [Citation(s) in RCA: 249] [Impact Index Per Article: 41.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2017] [Revised: 09/08/2017] [Accepted: 12/30/2017] [Indexed: 12/28/2022]
Abstract
African swine fever (ASF) recently has spread beyond sub-Saharan Africa to the Trans-Caucasus region, parts of the Russian Federation and Eastern Europe. In this new epidemiological scenario, the disease has similarities, but also important differences, compared to the situation in Africa, including the substantial involvement of wild boar. A better understanding of this new situation will enable better control and prevent further spread of disease. In this article, these different scenarios are compared, and recent information on the pathogenesis of ASF virus strains, the immune response to infection and prospects for developing vaccines is presented. Knowledge gaps and the prospects for future control are discussed.
Collapse
Affiliation(s)
| | - M Montoya
- The Pirbright Institute, Pirbright, Woking, Surrey GU24 0NF, UK
| | - A L Reis
- The Pirbright Institute, Pirbright, Woking, Surrey GU24 0NF, UK
| | - L K Dixon
- The Pirbright Institute, Pirbright, Woking, Surrey GU24 0NF, UK.
| |
Collapse
|
11
|
Maisonnasse P, Bouguyon E, Bourge M, Piton G, Ezquerra A, Deloizy C, Urien C, Leplat JJ, Simon G, Chevalier C, Vincent-Naulleau S, Crisci E, Montoya M, Schwartz-Cornil I, Bertho N. Pig as a biomedical model: Putting the porcine lung dendritic cells/macrophages network into light. Rev Mal Respir 2017. [DOI: 10.1016/j.rmr.2016.10.867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
12
|
Maisonnasse P, Bouguyon E, Piton G, Ezquerra A, Urien C, Deloizy C, Bourge M, Leplat JJ, Simon G, Chevalier C, Vincent-Naulleau S, Crisci E, Montoya M, Schwartz-Cornil I, Bertho N. The respiratory DC/macrophage network at steady-state and upon influenza infection in the swine biomedical model. Mucosal Immunol 2016; 9:835-49. [PMID: 26530136 DOI: 10.1038/mi.2015.105] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Accepted: 08/12/2015] [Indexed: 02/04/2023]
Abstract
Human and mouse respiratory tracts show anatomical and physiological differences, which will benefit from alternative experimental models for studying many respiratory diseases. Pig has been recognized as a valuable biomedical model, in particular for lung transplantation or pathologies such as cystic fibrosis and influenza infection. However, there is a lack of knowledge about the porcine respiratory immune system. Here we segregated and studied six populations of pig lung dendritic cells (DCs)/macrophages (Mθs) as follows: conventional DCs (cDC) 1 and cDC2, inflammatory monocyte-derived DCs (moDCs), monocyte-derived Mθs, and interstitial and alveolar Mθs. The three DC subsets present migratory and naive T-cell stimulation capacities. As observed in human and mice, porcine cDC1 and cDC2 were able to induce T-helper (Th)1 and Th2 responses, respectively. Interestingly, porcine moDCs increased in the lung upon influenza infection, as observed in the mouse model. Pig cDC2 shared some characteristics observed in human but not in mice, such as the expression of FCɛRIα and Langerin, and an intra-epithelial localization. This work, by unraveling the extended similarities of the porcine and human lung DC/Mθ networks, highlights the relevance of pig, both as an exploratory model of DC/Mθ functions and as a model for human inflammatory lung pathologies.
Collapse
Affiliation(s)
- P Maisonnasse
- Virologie et Immunologie Moléculaires UR892, Institut National de la Recherche Agronomique, Jouy-en-Josas, France
| | - E Bouguyon
- Virologie et Immunologie Moléculaires UR892, Institut National de la Recherche Agronomique, Jouy-en-Josas, France
| | - G Piton
- INRA, UMR Génétique Animale et Biologie Intégrative (GABI), Equipe Génétique Immunité Santé, Jouy-en-Josas, France.,Laboratoire de Radiobiologie et Etude du genome, CEA, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Jouy-en-Josas, France
| | - A Ezquerra
- Dpto. de Biotecnología, Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Madrid, Spain
| | - C Urien
- Virologie et Immunologie Moléculaires UR892, Institut National de la Recherche Agronomique, Jouy-en-Josas, France
| | - C Deloizy
- Virologie et Immunologie Moléculaires UR892, Institut National de la Recherche Agronomique, Jouy-en-Josas, France
| | - M Bourge
- I2BC, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France
| | - J-J Leplat
- INRA, UMR Génétique Animale et Biologie Intégrative (GABI), Equipe Génétique Immunité Santé, Jouy-en-Josas, France.,Laboratoire de Radiobiologie et Etude du genome, CEA, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Jouy-en-Josas, France
| | - G Simon
- Anses, Laboratoire de Ploufragan/Plouzané, Unité Virologie Immunologie Porcines, BP53, Ploufragan, France.,Université Européenne de Bretagne, Rennes, France
| | - C Chevalier
- Virologie et Immunologie Moléculaires UR892, Institut National de la Recherche Agronomique, Jouy-en-Josas, France
| | - S Vincent-Naulleau
- INRA, UMR Génétique Animale et Biologie Intégrative (GABI), Equipe Génétique Immunité Santé, Jouy-en-Josas, France.,Laboratoire de Radiobiologie et Etude du genome, CEA, Direction des Sciences du Vivant, Institut de Radiobiologie Cellulaire et Moléculaire, Jouy-en-Josas, France
| | - E Crisci
- Centre de Recerca en Sanitat Animal (CReSA), UAB-IRTA, Campus de la Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), Spain
| | - M Montoya
- Centre de Recerca en Sanitat Animal (CReSA), UAB-IRTA, Campus de la Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallès), Spain.,The Pirbright Institute, Surrey, UK
| | - I Schwartz-Cornil
- Virologie et Immunologie Moléculaires UR892, Institut National de la Recherche Agronomique, Jouy-en-Josas, France
| | - N Bertho
- Virologie et Immunologie Moléculaires UR892, Institut National de la Recherche Agronomique, Jouy-en-Josas, France
| |
Collapse
|
13
|
Defrère D, Hinz PM, Skemer AJ, Kennedy GM, Bailey VP, Hoffmann WF, Mennesson B, Millan-Gabet R, Danchi WC, Absil O, Arbo P, Beichman C, Brusa G, Bryden G, Downey EC, Durney O, Esposito S, Gaspar A, Grenz P, Haniff C, Hill JM, Lebreton J, Leisenring JM, Males JR, Marion L, McMahon TJ, Montoya M, Morzinski KM, Pinna E, Puglisi A, Rieke G, Roberge A, Serabyn E, Sosa R, Stapeldfeldt K, Su K, Vaitheeswaran V, Vaz A, Weinberger AJ, Wyatt MC. FIRST-LIGHT LBT NULLING INTERFEROMETRIC OBSERVATIONS: WARM EXOZODIACAL DUST RESOLVED WITHIN A FEW AU OF η Crv. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/0004-637x/799/1/42] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
14
|
Kuske R, Smith L, Snyder M, Quiet C, A. delaVega, Montoya M. A Comparison of Acute and Subacute Toxicity for High Upper Outer Quadrant Breast Cancers Treated by Whole Breast Irradiation (WBI) Versus Accelerated Partial Breast Irradiation (APBI). Int J Radiat Oncol Biol Phys 2013. [DOI: 10.1016/j.ijrobp.2013.06.588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
15
|
Abstract
The ferret has emerged as an excellent animal model to characterize several physiologic and pathologic conditions. The distribution and characterization of different types of immune system cells were studied in healthy ferret tissues. Eight primary antibodies were tested for immunohistochemistry in formalin-fixed tissues: anti-CD3, anti-CD79α, anti-CD20, anti-HLA-DR, anti-lysozyme, anti-CD163, anti-SWC3, and anti-Mac387. The anti-CD3 antibody labeled T cells mainly in interfollicular and paracortical areas of lymph nodes, cortex and thymic medulla, and periarteriolar lymphoid sheaths in the spleen. The anti-CD79α and anti-CD20 antibodies immunolabeled B cells located in lymphoid follicles at lymph nodes, spleen, and Peyer patches. The CD79α and CD20 antibodies also labeled cells with nonlymphoid morphology in atypical B-cell locations. The anti-HLA-DR antibody labeled macrophages, some populations of B and T lymphocytes, and different populations of dendritic cells in lymph nodes, Peyer patches, spleen, and thymus. The anti-lysozyme antibody immunolabeled macrophages in the liver, lymph nodes, spleen, and thymus. The Mac-387, CD163, and SWC3 antibodies did not show any positive reaction in formalin-fixed or frozen tissues. To elucidate the origin of the uncommon CD79α/CD20 positive cells, a double immunohistochemistry was carried out using the anti-HLA-DR + the anti-CD79α, the anti-HLA-DR + the anti-CD20, and the anti-lysozyme + the anti-CD79α antibodies. Double labeling was mainly observed when the anti-HLA-DR + the anti-CD79α antibodies were combined. The immunohistologic characterization and distribution of these immune system cells in healthy ferret tissues should be of value in future comparative studies of diseases in ferrets.
Collapse
Affiliation(s)
- B. Vidaña
- Departament de Sanitat i Anatomia Animals, Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallés), Spain
- Centre de Recerca en Sanitat Animal (CReSA), UAB-IRTA, Campus de la Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallés), Spain
| | - N. Majó
- Departament de Sanitat i Anatomia Animals, Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallés), Spain
- Centre de Recerca en Sanitat Animal (CReSA), UAB-IRTA, Campus de la Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallés), Spain
| | - M. Pérez
- Centre de Recerca en Sanitat Animal (CReSA), UAB-IRTA, Campus de la Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallés), Spain
| | - M. Montoya
- Centre de Recerca en Sanitat Animal (CReSA), UAB-IRTA, Campus de la Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallés), Spain
- Institut de Recerca i Tecnologia Agroalimentaria (IRTA), Barcelona, Spain
| | - J. Martorell
- Departament de Medicina i Cirurgia Animals, Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallés), Spain
| | - J. Martínez
- Departament de Sanitat i Anatomia Animals, Universitat Autònoma de Barcelona, Bellaterra (Cerdanyola del Vallés), Spain
| |
Collapse
|
16
|
Espinoza J, Madrid L, Soto F, Montoya M. Impacto de la información en epilepsia sobre las actitudes y creencias de un grupo de profesores. ACTA ACUST UNITED AC 2013. [DOI: 10.20453/rnp.v65i2.1512] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
17
|
Crisci E, Fraile L, Moreno N, Blanco E, Cabezón R, Costa C, Mussá T, Baratelli M, Martinez-Orellana P, Ganges L, Martínez J, Bárcena J, Montoya M. Chimeric calicivirus-like particles elicit specific immune responses in pigs. Vaccine 2012; 30:2427-39. [PMID: 22306796 PMCID: PMC7115503 DOI: 10.1016/j.vaccine.2012.01.069] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2011] [Revised: 01/20/2012] [Accepted: 01/22/2012] [Indexed: 11/29/2022]
Abstract
Virus-like particles (VLPs) have received considerable attention due to their potential application in veterinary vaccines and, in particular, VLPs from rabbit haemorrhagic disease virus (RHDV) have successfully shown to be good platforms for inducing immune responses against an inserted foreign epitope in mice. The aim of this study was to assess the immunogenicity of chimeric RHDV-VLPs as vaccine vectors in pigs. For this purpose, we have generated chimeric VLPs containing a well-known T epitope of 3A protein of foot-and-mouth disease virus (FMDV). Firstly, RHDV-VLPs were able to activate immature porcine bone marrow-derived dendritic cells (poBMDCs) in vitro. Secondly, pigs were inoculated twice in a two-week interval with chimeric RHDV-VLPs at different doses intranasally or intramuscularly. One intramuscularly treated group was also inoculated with adjuvant Montanide™ ISA 206 at the same time. Specific IgG and IgA antibodies against RHDV-VLPs were induced and such levels were higher in the adjuvanted group compared with other groups. Interestingly, anti-RHDV-VLP IgA responses were higher in groups inoculated intramuscularly than those that received the VLPs intranasally. Two weeks after the last immunisation, specific IFN-γ-secreting cells against 3A epitope and against RHDV-VLPs were detected in PBMCs by ELISPOT. The adjuvanted group exhibited the highest IFN-γ-secreting cell numbers and lymphoproliferative specific T cell responses against 3A epitope and RHDV-VLP. This is the first immunological report on the potential use of chimeric RHDV-VLPs as antigen carriers in pigs.
Collapse
Affiliation(s)
- E Crisci
- Centre de Recerca en Sanitat Animal, UAB-IRTA, Campus de la Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
18
|
Montoya M, Abad MJ, Losada LB, Pettarin V, Bernal C. Impact fracture behavior and damage mechanisms of PP/EVOH blends compatibilized with ionomer Zn 2+. J Appl Polym Sci 2010. [DOI: 10.1002/app.32149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
19
|
Martinez M, Herrero L, Salvanes R, Montoya M, Cobo A, Garcia-Velasco J. Vitrification vs. slow freezing of oocytes: effects on morphological appearance, meiotic spindle configuration and DNA damage. Fertil Steril 2008. [DOI: 10.1016/j.fertnstert.2008.07.447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
20
|
Abstract
Adrenocortical carcinoma is an uncommon malignancy that is usually fatal within a short time after diagnosis. We have investigated the effects on the growth and survival of SW-13 human adrenal carcinoma cells in culture of some currently used and some potentially new agents in the treatment of adrenal cancer. Established drugs tested were mitotane, cisplatin, etoposide, 5-fluorouracil, and suramin. Other agents studied included adenine arabinofuranoside, cytosine arabinofuranoside, 2-methoxyestradiol, and paclitaxel. The most potent chemotherapeutic agents in this system were paclitaxel and 2-methoxyestradiol, with EC (50) of 1.8x10 (-8) and 3.3x10 (-7) M, respectively. Cytosine arabinofuranoside and cisplatin both had the same EC (50) of 7.0x10 (-7) M, and etoposide 1.1x10 (-6) M. All the other agents tested required much higher doses for effect, including mitotane, the current most commonly used chemotherapy for adrenal cancer, with an EC (50) of 3.3x10 (-4) M. These data suggest that paclitaxel, 2-methoxyestradiol, and cytosine arabinofuranoside should be further evaluated for their potential in the chemotherapy of adrenal carcinoma.
Collapse
Affiliation(s)
- M Montoya
- Adrenal Research Laboratory, V. A. Medical Center, Miami, FL, USA
| | | | | |
Collapse
|
21
|
Brown JW, Prieto LM, Perez-Stable C, Montoya M, Cappell S, Fishman LM. Estrogen and progesterone lower cyclin B1 AND D1 expression, block cell cycle in G2/M, and trigger apoptosis in human adrenal carcinoma cell cultures. Horm Metab Res 2008; 40:306-10. [PMID: 18491248 DOI: 10.1055/s-2008-1073140] [Citation(s) in RCA: 7] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The effects of 17 beta-estradiol and progesterone were evaluated separately and in combination, on the growth, survival, and cell cycle dynamics of SW-13 human adrenal carcinoma cells in culture. Both hormones significantly decreased cell survival, with dose response curves at four days demonstrating EC (50)s estimated at 1.2 x 10 (-5) M for 17 beta-estradiol and 4.8 x 10 (-6) M for progesterone. Flow cytometry studies of these cultures indicated a strong G2/M blocking effect of both steroids, either individually or in combination; the effects of progesterone and of both agents together were substantially greater than the effect with 17 beta-estradiol alone. The sub-G1 region of the flow cytometry profile was significantly enhanced by exposure to 17 beta-estradiol and even more by progesterone. Sub-G1 "apoptosis" was confirmed by fragmented and condensed nuclear chromatin staining using a standard DAPI fluorescence assay. The expression of the critical cell cycle regulatory proteins cyclin B1 and D1 were significantly decreased by each hormone, with the influence of progesterone again predominating. These data demonstrate that high doses of 17 beta-estradiol and progesterone have inhibitory and apoptotic effects on SW-13 human adrenal carcinoma cells IN VITRO. The observed effects are associated with declines in cyclin B1 and D1 expression as well as a block in G2/M.
Collapse
Affiliation(s)
- J W Brown
- Adrenal Research Laboratory, V. A. Medical Center, Miami, FL, USA.
| | | | | | | | | | | |
Collapse
|
22
|
Cifuentes F, Montoya M, Morales M. High-frequency stimuli preferentially release large dense-core vesicles located in the proximity of nonspecialized zones of the presynaptic membrane in sympathetic ganglia. Dev Neurobiol 2008; 68:446-56. [DOI: 10.1002/dneu.20604] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
23
|
Ríos A, Montoya M, Rodríguez JM, Parrilla P. [Severe lower gastrointestinal hemorrhage caused by colonic angiodysplasia. Diagnosis and management]. Rev Esp Enferm Dig 2006; 98:625-6. [PMID: 17049000 DOI: 10.4321/s1130-01082006000800010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
24
|
Cabezuelo JB, Ramírez P, Ríos A, Acosta F, Torres D, Sansano T, Pons JA, Bru M, Montoya M, Bueno FS, Robles R, Parrilla P. Risk factors of acute renal failure after liver transplantation. Kidney Int 2006; 69:1073-80. [PMID: 16528257 DOI: 10.1038/sj.ki.5000216] [Citation(s) in RCA: 213] [Impact Index Per Article: 11.8] [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: 12/14/2022]
Abstract
The objective of this study was to determine the risk factors of postoperative acute renal failure (ARF) in orthotopic liver transplantation (OLT). We reviewed 184 consecutive OLT. Postoperative ARF was defined as a persistent rise of 50% increase or more of the S-creatinine (S-Cr). The patients were classified as early postoperative ARF (E-ARF) (first week) and late postoperative ARF (L-ARF) (second to fourth week). Preoperative variables were age, sex, comorbidity, indication for OLT, Child-Pugh stage, united network for organ sharing status, analysis of the blood and urine, and donor's data. Intraoperative variables were systolic arterial pressure, mean arterial pressure, pulmonary capillary wedge pressure, cardiac index, and systemic vascular resistance index. Surgical technique, number of blood products transfused, need for adrenergic agonist drugs, and intraoperative complications were also important. Postoperative variables were duration of stay in the intensive care unit, time on mechanic ventilation, liver graft dysfunction, need for adrenergic agonist drugs, units of blood products infused, episodes of acute rejection, re-operations, and bacterial infections. Firstly we carried out a univariate statistical analysis, and secondly a logistic regression analysis. The risk factors for E-ARF were: pretransplant ARF (odds ratio (OR)=10.2, P=0.025), S-albumin (OR=0.3, P=0.001), duration of treatment with dopamine (OR=1.6, P=0.001), and grade II-IV dysfunction of the liver graft (OR=5.6, P=0.002). The risk factors for L-ARF were: re-operation (OR=3.1, P=0.013) and bacterial infection (OR=2.9, P=0.017). The development of E-ARF is influenced by preoperative factors such as ARF and hypoalbuminemia, as well as postoperative factors such as liver dysfunction and prolonged treatment with dopamine. The predicting factors of L-ARF differ from E-ARF and correspond to postoperative causes such as bacterial infection and surgical re-operation.
Collapse
Affiliation(s)
- J B Cabezuelo
- Nephrology Unit, Santa María del Rosell Hospital, Cartagena, Spain
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
25
|
Fernández OM, Ríos A, Sánchez A, Palenciano CG, Martínez L, Conesa C, Montoya M, Pons JA, Ramírez P, Parrilla P. Pathology findings in a model of auxiliary liver transplantation with portal vein arterialization in pigs. Transplant Proc 2006; 37:3939-42. [PMID: 16386591 DOI: 10.1016/j.transproceed.2005.10.048] [Citation(s) in RCA: 3] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
OBJECTIVE To determine the histological findings and temporal evolution that occur in auxiliary liver grafts as a consequence of arterialization of the portal vein (PVA). MATERIALS AND METHODS We evaluated 10 auxiliary heterotopic liver transplants with arterialization of the PVA. The histological study was performed using an optical microscope to process liver samples with staining using hematoxylin and eosin. A biopsy of native liver tissue was used as a control. RESULTS Two animals were excluded from the study, one due to ischemic necrosis of the graft and one that died 4 hours after transplant. All of the remaining eight animals underwent a histological study at 1 day, 7 days, and 14 days. The most significant histological findings were: (1) dilation of portal areas and sinusoids, which were detected at 24 hours and persisted; (2) thickening of the interlobular septum, which was observed after day 7 and progressively increased to day 14; (3) bile duct hyperplasia detected at the seventh day. CONCLUSIONS The consistent, early findings in a pig liver with PVA included vascular dilation of the portal area and the sinusoids, with bile duct hyperplasia extending progressively and the thickening of interlobular connective tissue septa with a generalized perilobular connective tissue reaction, which did not seem to alter the internal structure of the lobule, which showed histologically normal hepatocytes. The fibrous reaction may be the first stage in chronic hepatopathy. Further long-term studies are required in this model.
Collapse
Affiliation(s)
- O M Fernández
- Unit of Experimental Surgery, Department of Surgery, Arrixaca University Hospital, El Palmar, Murcia, Spain.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
26
|
Martínez-Alarcón L, Ríos A, Conesa C, Alcaraz J, González MJ, Montoya M, Fernández OM, Pons JA, Ramírez P, Parrilla P. Attitude Toward Living Related Donation of Patients on the Waiting List for a Deceased Donor Solid Organ Transplant. Transplant Proc 2005; 37:3614-7. [PMID: 16386484 DOI: 10.1016/j.transproceed.2005.08.059] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [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: 11/21/2022]
Abstract
INTRODUCTION Spain is the country with the highest rate of donation from deceased individuals. However, given the deficit in organs, living donation is being encouraged. Our objective was to analyze attitudes toward living donation among patients on the waiting list for a transplant. MATERIALS AND METHODS Patients on the waiting list for a kidney or liver transplant (n = 96; 46 kidney and 50 liver) in the last year had their attitudes toward living donation evaluated through a psychosocial survey performed in a direct interview with an independent health professional from the transplant unit and analyzed by Student t test and the chi-square test. RESULTS Ninety-one percent were in favor of donating their organs when they die, 6% had doubts, and the remaining 3% were against it. Twenty percent would accept living donation from a family member (32% in liver vs 7% in kidney; P < .05), despite 89% of them accepting that there would be a risk to the family member. Twenty percent reported that a family member had suggested donating, but the patient was opposed. Finally, only 6% considered living donation to be their first choice, 42% did not consider this option. Up to 96% would donate an organ to a family member if they were requested to do so. CONCLUSION Patients on the waiting list are not favorable to living related donation for themselves, although members of their family have proposed it to them. However, the liver patient is more prepared to accept it, possibly because that patient has no other alternative as do kidney patients have dialysis. Even so, they are favorable toward donating a living organ if a family member were to request one. In general, living donation is not being proposed to these patients as a real option, partly because of their doctors.
Collapse
|
27
|
Martínez-Alarcón L, Ríos A, Conesa C, Alcaraz J, González MJ, Montoya M, Fernández OM, Majado M, Ramírez P, Parrilla P. Attitude Toward Xenotransplantation in Kidney and Liver Patients on the Transplant Waiting List. Transplant Proc 2005; 37:4107-10. [PMID: 16386638 DOI: 10.1016/j.transproceed.2005.09.187] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [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: 10/25/2022]
Abstract
INTRODUCTION The deficit in transplant organs is encouraging research into stem cells and xenotransplantation. However, many studies have shown that using animals for human transplantation could be rejected by society. The objective here was to analyze the attitude of patients on the waiting list toward a possible transplant of an organ of animal origin. MATERIALS AND METHODS Patients on the waiting list for kidney and liver transplants including last year (n = 96) underwent a direct interview by an independent health professional from the transplant unit. Using a psychosocial survey, an evaluation was made of attitudes toward donation of organs of animal origin and its various options. Student t test and the chi-square test were used for analysis. RESULTS If results from xenotransplantation could be superimposed onto those of human transplantation, 71% would accept such an organ. In the case of the kidney, 83% would accept, 4% would not, and 13% have doubts; as opposed to 60%, 12%, and 28%, respectively, of liver cases (P < .05). Supposing that the results were worse than in human organs, only 26% would accept an animal organ. Thus, for kidney, 33% would accept it, 48% would not, and 20% would have doubts; and for liver, it would be 20%, 50%, and 30%, respectively. In a life-threatening situation 98% would accept an animal organ as a bridge of hope in the wait for a human organ. In addition, if the organ functioned correctly, 98% would keep the animal organ, thus avoiding an intervention to substitute a human organ. CONCLUSION If xenotransplantation became a clinical reality, acceptance of an animal organ by patients on the waiting list would be low, especially if the results could not be superimposed onto human ones. Only its use as a bridge until the arrival of a human organ would increase its acceptance.
Collapse
Affiliation(s)
- L Martínez-Alarcón
- Coordinación Regional de Trasplantes, Consejería de Sanidad, Murcia, Spain.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Montoya M, Abad MJ, Barral Losada L, Bernal C. Deformation and fracture behavior of polypropylene-ethylene vinyl alcohol blends compatibilized with ionomer Zn2+. J Appl Polym Sci 2005. [DOI: 10.1002/app.22175] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
29
|
Munitiz V, Ortiz A, Martinez de Haro LF, Glover G, Ferri B, Montoya M, Parrilla P. Diagnosis and treatment of oculopharyngeal dystrophy: a report of three cases from the same family. Dis Esophagus 2003; 16:160-4. [PMID: 12823221 DOI: 10.1046/j.1442-2050.2003.00318.x] [Citation(s) in RCA: 4] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Oculopharyngeal muscular dystrophy is a hereditary pathology transmitted in an autosomal dominant manner. The clinical symptoms are palpebral ptosis, oropharyngeal dysphagia and proximal limb weakness. Upper gastro-esophageal endoscopy is recommended to study the dysphagia, a video-radiology study with barium and an esophageal manometry to study the pharyngeo-esophageal motor disorder. Muscle biopsy reveals the presence of atrophic fibers substituted by an increase in fat and connective tissue. In 1998 Brais described the genetic alteration responsible for this pathology, a limited expansion of the triplet of GCG nucleotides in PABP2 gene on chromosome 14q11. Normal individuals have the homozygotic form (GCG)6 of this triplet, whereas patients with the described syndrome have the heterozygotic form (GCG)6-(GCG)9 or (GCG)6-(GCG)10. We present three siblings from the same family with diagnoses and genetic confirmations of oculopharyngeal dystrophy. Two of the patients underwent cricopharyngeal myotomy to relieve the dysphagia.
Collapse
Affiliation(s)
- V Munitiz
- Department of Surgery, Virgen de la Arrixaca University Hospital Murcia, Spain
| | | | | | | | | | | | | |
Collapse
|
30
|
Fernández-Rodríguez OM, Ríos A, Montoya M, Ramírez P, González F, Ruíz de Angulo D, Conesa C, Sánchez A, García Palenciano C, Pons JA, Parrílla P. Description of a new auxiliary heterotopic partial liver transplantation technique with portal vein arteriolization of applicability in heterotopic liver xenotransplantation. Transplant Proc 2003; 35:2051-3. [PMID: 12962893 DOI: 10.1016/s0041-1345(03)00709-7] [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: 11/18/2022]
Abstract
OBJECTIVE The aim of this study was to describe a new model of auxiliary heterotopic partial liver transplantation with portal vein arterialization. MATERIALS AND METHODS Three standard hepatectomies were performed in pigs. The left lateral lobe was surgically resected and portal vein arteriolization constructed by an end-to-side "Y" anastomoses between the distal to the celiac axis aorta and the portal vein. RESULTS The graft was placed in the left iliaca fossa using anastomoses of the donor infrahepatic inferior cava vein end-to-side to the host infrarenal inferior vein and the donor aortic stump with portal vein arteriolization end-to-side to the left iliac artery. After graft reperfusion, the 3 recipients showed intraoperative hypotension, which was treated with fluid administration and vasoactive drugs. At the end of the operation, the graft displayed normal arterial blood flow and good venous drainage. The donor liver graft appeared more red than the host liver, which was due to the increased arterial blood flow. One pig of 3 died at 24 hours after surgery, probably due to hypothermia. However, the other 2 pigs survived the procedure and remained stable. Echographic monitoring showed intrahepatic arterial expansion, which may be the result of high blood pressure due to the arteriolization procedure. CONCLUSIONS We have developed a novel and easy to perform technique that diminishes the number of anastomoses and does not involve vessels from other organs.
Collapse
Affiliation(s)
- O M Fernández-Rodríguez
- Unit of Experimental Surgery, Departament of Surgery, Arrixaca University Hospital, 30120-El Palmar, Murcia, Spain.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
31
|
Cabezuelo JB, Ramirez P, Acosta F, Torres D, Sansano T, Pons JA, Bru M, Montoya M, Rios A, Sánchez Bueno F, Robles R, Parrilla P. Does the standard vs piggyback surgical technique affect the development of early acute renal failure after orthotopic liver transplantation? Transplant Proc 2003; 35:1913-4. [PMID: 12962846 DOI: 10.1016/s0041-1345(03)00598-0] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The objective of this study was to evaluate the effect of the surgical technique on postoperative renal function during the first week after liver transplantation (OLT). We performed a retrospective study of 184 consecutive OLT. Criteria for acute renal failure were: serum creatinine >1.5 mg/dL, an increase by 50% in the baseline serum creatinine, or oliguria requiring renal replacement therapy. The distribution of patients according to the surgical technique was: standard (n=84), venovenous bypass (n=20), and piggyback (n=80). Other variables analyzed were: intraoperative requirement for blood products, treatment with adrenergic agonists, intraoperative complications, and postreperfusion syndrome. Univariate analysis showed the following parameters to be significantly related to postoperative renal failure: intraoperative fresh frozen plasma and cryoprecipitate requirements, intraoperative complications, postreperfusion syndrome, need for noradrenaline or dobutamine, standard surgical technique versus piggyback (39% vs 18%, P<.01) and venovenous vs piggyback (50% vs 18%, P<.01). Logistic regression analysis identified the following variables as having independent prognostic value: (1) Standard surgical technique vs piggyback (OR=3.3, P=.01); (2) venovenous vs piggyback (OR=4.7, P=.02); and (3) >20 U cryoprecipitate requirement (OR=1.04, P=.01). In conclusion, compared with the piggyback technique, the standard surgical technique appears to be an independent risk factor for postoperative acute renal failure. When venovenous bypass is used in patients who do not tolerate trial clamping of inferior vena cava, it does not reduce the incidence of postoperative renal failure. Finally, the piggyback technique significantly reduces the probability of acute renal failure after liver transplantation.
Collapse
Affiliation(s)
- J B Cabezuelo
- Liver Transplant Unit, University Hospital V. Arrixaca, Murcia, Spain
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
32
|
Sáez CG, Velásquez L, Montoya M, Eugenín E, Alvarez MG. Increased gap junctional intercellular communication is directly related to the anti-tumor effect of all-trans-retinoic acid plus tamoxifen in a human mammary cancer cell line. J Cell Biochem 2003; 89:450-61. [PMID: 12761879 DOI: 10.1002/jcb.10519] [Citation(s) in RCA: 22] [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: 11/12/2022]
Abstract
Additive effects against tumor cells might be achieved by combining anti-neoplastic agents directed against one or more altered mechanisms in cancer. We investigated the participation of gap junctional intercellular communication (GJIC), which is commonly dysfunctional in tumor cells as a possible mediating mechanism of the effect of all-trans-retinoic acid (RA) and tamoxifen (Tx) in MCF-7 human breast cancer cell lines. The combination of RA + Tx stimulated GJIC in approximately 53 +/- 3% of MCF-7 cells as early as after 6 h of treatment remaining communicated through 144 h of culture. The GJIC enhancement occurred along with immunolocalization of Cx26 and 43 at the membrane of contacting cells and correlated with higher protein levels. Cx40 immunoreactive plaques were detected at cell-to-cell contacts during 48 h of RA + Tx treatment that did not involve higher protein expression, to the contrary, a downregulation occurred after 72 h of treatment. Cell proliferation inhibition upon RA + Tx exposure was observed with optimal effects at 96-120 h of culture with an accumulation of cells primarily in G2/M and G0/G1 cell cycle boundaries. An enhancement of the pre-existing E-cadherin levels was observed after drug exposure along with a downregulation of Bcl-2 and C-myc protein levels and a reduction of telomerase activity, suggesting partial tumor phenotype reversion. Blockage of the RA + Tx-induced GJIC with 18-beta-glycyrrhetinic acid (beta-Gly) prevented in 34% the inhibition of MCF-7 proliferation and the E-cadherin increment in 30% at 96 h of culture. GJIC blockage did not alter the downregulation of Bcl-2, c-Myc, or telomerase activity induced by RA + Tx. Our results showed the participation of GJIC as a mediator mechanism of the combined action of RA and Tx in MCF-7 cells. The chemopreventive modulation of GJIC might represent an approachable alternative for the improvement of cancer therapy.
Collapse
Affiliation(s)
- Claudia G Sáez
- Departamento de Hematología-Oncología, Facultad de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile.
| | | | | | | | | |
Collapse
|
33
|
Lucas M, Tsitoura E, Montoya M, Laliotou B, Aslanoglou E, Kouvatsis V, Entwisle C, Miller J, Klenerman P, Hadziyannis A, Hadziyannis S, Borrow P, Mavromara P. Characterization of secreted and intracellular forms of a truncated hepatitis C virus E2 protein expressed by a recombinant herpes simplex virus. J Gen Virol 2003; 84:545-554. [PMID: 12604804 DOI: 10.1099/vir.0.18775-0] [Citation(s) in RCA: 9] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
A replication-defective herpes simplex virus type 1 (HSV-1) recombinant lacking the glycoprotein H (gH)-encoding gene and expressing a truncated form of the hepatitis C (HCV) E2 glycoprotein (E2-661) was constructed and characterized. We show here that cells infected with the HSV/HCV recombinant virus efficiently express the HCV E2-661 protein. Most importantly, cellular and secreted E2-661 protein were both readily detected by the E2-conformational mAb H53 and despite the high expression levels, only limited amounts of misfolded aggregates were detected in either the cellular or secreted fractions. Furthermore, cell-associated and secreted E2-661 protein bound to the major extracellular loop (MEL) of CD81 in a concentration-dependent manner and both were highly reactive with sera from HCV-infected patients. Finally, BALB/c mice immunized intraperitoneally with the recombinant HSV/HCV virus induced high levels of anti-E2 antibodies. Analysis of the induced immunoglobulin G (IgG) isotypes showed high levels of IgG2a while the levels of the IgG1 isotype were significantly lower, suggesting a Th1-type of response. We conclude that the HSV-1 recombinant virus represents a promising tool for production of non-aggregated, immunologically active forms of the E2-661 protein and might have potential applications in vaccine development.
Collapse
Affiliation(s)
- M Lucas
- Molecular Virology Laboratory, Hellenic Pasteur Institute, 127 Vas. Sofias Ave, Athens 115 21, Greece
| | - E Tsitoura
- Molecular Virology Laboratory, Hellenic Pasteur Institute, 127 Vas. Sofias Ave, Athens 115 21, Greece
| | - M Montoya
- The Edward Jenner Institute for Vaccine Research, Compton, UK
| | - B Laliotou
- Molecular Virology Laboratory, Hellenic Pasteur Institute, 127 Vas. Sofias Ave, Athens 115 21, Greece
| | - E Aslanoglou
- Molecular Virology Laboratory, Hellenic Pasteur Institute, 127 Vas. Sofias Ave, Athens 115 21, Greece
| | - V Kouvatsis
- Molecular Virology Laboratory, Hellenic Pasteur Institute, 127 Vas. Sofias Ave, Athens 115 21, Greece
| | | | | | - P Klenerman
- Nuffield Department of Medicine, University of Oxford, Oxford, UK
| | - A Hadziyannis
- Second Department of Medicine, Athens University School of Medicine, Greece
| | - S Hadziyannis
- Second Department of Medicine, Athens University School of Medicine, Greece
| | - P Borrow
- The Edward Jenner Institute for Vaccine Research, Compton, UK
| | - P Mavromara
- Molecular Virology Laboratory, Hellenic Pasteur Institute, 127 Vas. Sofias Ave, Athens 115 21, Greece
| |
Collapse
|
34
|
Ramirez P, Chavez R, Majado M, Munitiz V, Muñoz A, Hernandez O, Palenciano CG, Pino-Chavez G, Loba M, Minguela A, Yelamos J, Gago MR, Vizcaino AS, Asensi H, Cayuela M, Segura B, Marin F, Rubio A, Fuente T, Robles R, Bueno FS, Sansano T, Acosta F, Rodriguez JM, Rios A, Montoya M, Navarro F, Cabezuelo J, Cozzi E, White DJG, Parrilla P. Transgenic pig-to-baboon liver xenotransplantation: clinical, biochemical, and immunologic pattern of delayed acute vascular rejection. Transplant Proc 2002; 34:319-20. [PMID: 11959306 DOI: 10.1016/s0041-1345(01)02834-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- P Ramirez
- Liver Transplant Unit, Department of Surgery, University Hospital Virgen Arrixaca, Murcia, Spain.
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Munítiz V, Ramírez P, Majado M, Hernández O, Loba M, Montoya M, Chávez R, Muñoz A, Ríos A, Fernández O, Minguela A, Yelamos J, Parrilla P. Analytical profile comparison between pig and baboon in an orthotopic liver xenotransplantation model. Transplant Proc 2002; 34:323-4. [PMID: 11959308 DOI: 10.1016/s0041-1345(01)02783-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- V Munítiz
- Unidad de Cirugía Experimental, Hospital Virgen de la Arrixaca, Ctra El Palmar, Murcia, Spain
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Cabezuelo JB, Ramirez P, Chavez R, Majado M, Munitiz V, Muñoz A, Hernandez Q, G-Palenciano C, Pino-Chávez G, Loba M, Yélamos J, Vizcaino AS, Cayuela M, Segura B, Marin F, Rubio A, Fuente T, Gago MR, Ríos A, Montoya M, Esteban A, Bueno FS, Robles R, Cozzi E, White DJG, Parrilla P. Assessment of renal function during the postoperative period following liver xenotransplantation from transgenic pig to baboon. Transplant Proc 2002; 34:321-2. [PMID: 11959307 DOI: 10.1016/s0041-1345(01)02782-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- J B Cabezuelo
- Liver Transplant Unit, University Hospital V. Arrixaca, El Palmar, Murcia, Spain
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Palenciano CG, Segura B, Ramirez P, Chavez R, Munitiz V, Cayuela MG, Acosta F, Sansano T, Majado M, Muñoz A, Hernandez O, Pino-Chavez G, Loba M, Yelamos J, Gago MR, Vizcaino AS, Asensi H, Marin F, Rubio A, Fuente T, Rios A, Montoya M, Robles R, Bueno FS, Rodriguez JM, Navarro F, Cabezuelo J, Cozzi E, White DJG, Parrilla P. Acid-base and electrolyte disturbances in an experimental model of orthotopic liver xenotransplantation from pig to baboon after graft reperfusion: differences between h-DAF livers and unmodified livers. Transplant Proc 2002; 34:325-6. [PMID: 11959309 DOI: 10.1016/s0041-1345(01)02784-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- C G Palenciano
- Liver Transplant Unit, University Hospital V. Arrixaca, El Palmar, Murcia, Spain
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
38
|
Piñero Madrona A, Robles R, López J, Montoya M, Aguayo JL, Sánchez-Bueno F, Parrilla P. Evolution of the need for operation for peptic pyloric stenosis over a period of 24 years (1976-1999). Eur J Surg 2001; 167:758-60. [PMID: 11775727 DOI: 10.1080/11024150152707734] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
OBJECTIVE To analyse the need for operation for pyloric stenosis caused by duodenal ulcer over a period of 24 years (1976-1999). DESIGN Retrospective study. SETTING University hospital, Spain. SUBJECTS 156 patients operated on for peptic pyloric stenosis. MAIN OUTCOME MEASURES The number of patients operated on yearly were grouped into 4-year periods for statistical comparison. RESULTS The number of cases operated on each year steadily decreased between 1976 and 1999. In the 1988-1991 period there was a significant reduction (p <0.05), which continued over the next two 4-year periods, particularly the last (p <0.01). CONCLUSION Although we cannot use this study to establish a direct relation between the decrease in the indication for operations for peptic pyloric stenosis and the use of H2 antagonists, proton pump inhibitors, or treatment to eradicate Helicobacter pylori, we did find a significance difference between the years before and after the introduction of these drugs.
Collapse
Affiliation(s)
- A Piñero Madrona
- Department of General Surgery and Digestive I. Virgen de la Arrixaca University Hospital, Murcia, Spain
| | | | | | | | | | | | | |
Collapse
|
39
|
Abstract
Canine dirofilariasis is widespread in urban areas of central and northern Colombia. Previously we detected specific antibodies against complex antigens from Dirofilaria immitis adult worms in individuals from an isolated Tikuna Indian community in the Colombian Amazon. In this study a 56 kDa polypeptide from the adult D. immitis excretory/secretory (E/S) products is identified by Western blot, isolated by elution from polyacrilamide gels and applied in an ELISA-based test for the detection of specific IgG. Eleven of 74 serum samples analysed were positive by ELISADi56. Positive individuals came from five different areas of Colombia. The highest number of positives was found in the Amazon (4), followed by Bogotà (3). The physicians of the area must be alerted regarding the existence of human D. immitis infections and include dirofilariasis in the differential diagnosis of pulmonary nodules.
Collapse
Affiliation(s)
- C Vieira
- Laboratorio de Parasitología, Facultad de Farmacia, Universidad de Salamanca, Spain
| | | | | | | | | |
Collapse
|
40
|
Diaz Brinton R, Chen S, Montoya M, Hsieh D, Minaya J, Kim J, Chu HP. The women's health initiative estrogen replacement therapy is neurotrophic and neuroprotective. Neurobiol Aging 2000; 21:475-96. [PMID: 10858597 DOI: 10.1016/s0197-4580(00)00109-3] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.5] [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]
Abstract
The current study investigated the neurotrophic and neuroprotective action of the complex formulation of conjugated equine estrogens (CEEs), the most frequently prescribed estrogen replacement therapy in the United States and the estrogen replacement therapy of the Women's Health Initiative. Morphologic analyses demonstrated that CEEs significantly increased neuronal outgrowth in hippocampal, basal forebrain, occipital, parietal and frontal cortex neurons. Dose-response analyses indicated that the lowest effective concentration of CEEs exerted the maximal neurotrophic effect with greatest potency occurring in hippocampal and occipital cortex neurons. CEES induced highly significant neuroprotection against beta amyloid(25-35), hydrogen peroxide and glutamate-induced toxicity. Rank order of potency and magnitude of CEE-induced neuroprotection in the brain regions investigated was hippocampal neurons > basal forebrain neurons > cortical neurons. In hippocampal neurons pre-exposed to beta amyloid(25-35), CEEs halted Abeta(25-35)-induced cell death and protected surviving neurons from further cell death induced by Abeta(25-35). Because CEEs are the estrogen replacement therapy of the Women's Health Initiative, results of the current study could provide cellular mechanisms for understanding effects of CEEs on cognitive function and risk of Alzheimer's disease derived from this prospective clinical trial.
Collapse
Affiliation(s)
- R Diaz Brinton
- Department of Molecular Pharmacology and Toxicology and the Program in Neuroscience, University of Southern California, Pharmaceutical Sciences Center, 1985 Zonal Avenue, Los Angeles, CA 90033, USA.
| | | | | | | | | | | | | |
Collapse
|
41
|
Puente J, Blanco L, Montoya M, Miranda D, Contreras I, Vinés E, Wolf ME, Mosnaim AD. Effect of Salmonella typhi wild type and O-antigen mutants on human natural killer cell activity. Int J Immunopharmacol 2000; 22:355-64. [PMID: 10708883 DOI: 10.1016/s0192-0561(99)00089-2] [Citation(s) in RCA: 5] [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: 11/30/2022]
Abstract
We investigated the effect of glutaraldehyde-fixed Salmonella typhi Ty2 (Vi(-)) wild-type (World Health Organization's vaccine strain) and mutant strains MEI028 (rough, O-antigen(-)) and MEI012 [smooth (O-antigen(+)95%), immunomagnetically isolated NK cell preparations. Incubation of PBMC with each and every one of the S. typhi strains studied consistently and significantly, increased this cellular immune function, as well as the supernatant level of the various cytokines tested e.g. IFN-gamma, TNF-alpha, IL-10 and IL-12 (ELISA). In similar experiments, a significant increase in the cytolytic activity of HPNK cells was elicited by S. typhi Ty2 but not by mutant strain MEI028; neither of the cytokines assayed (IFN-gamma and TNF-alpha) was detected in the supernatant. Our results suggest that S. typhi O-antigen plays an essential role in a mechanism resulting in the direct activation of NK cell activity in HPNK cell preparations. However, the relative quantitative significance of this antigen in the direct stimulation of NK cell cytotoxicity expression in PBMC samples is less clear, as it appears that in this case bacterial-induced monocyte-released cytokines plays a most important role. Incubation with S. typhi Ty2 or MEI028 elicited significant expression of CD69, an early marker of NK cell activation, in PBMC but not in HPNK cell samples (flow cytometry); in similar experiments, the expression of CD16/56 and activation marker CD25 remained essentially unchanged.
Collapse
Affiliation(s)
- J Puente
- Department of Biochemistry and Molecular Biology, Faculty of Chemical and Pharmaceutical Sciences, University of Chile, Santiago, Chile
| | | | | | | | | | | | | | | |
Collapse
|
42
|
Brinton RD, Chen S, Montoya M, Hsieh D, Minaya J. The estrogen replacement therapy of the Women's Health Initiative promotes the cellular mechanisms of memory and neuronal survival in neurons vulnerable to Alzheimer's disease. Maturitas 2000; 34 Suppl 2:S35-52. [PMID: 10915920 DOI: 10.1016/s0378-5122(00)00107-9] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [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: 12/18/2022]
Abstract
OBJECTIVES The current study investigated the neurotrophic and neuroprotective action of the complex formulation of conjugated equine estrogens (CEEs), the most frequently prescribed estrogen replacement therapy in the United States and the estrogen replacement therapy of the Women's Health Initiative. METHODS Videomicroscopic, morphologic and biochemical analyses were conducted in primary cultures of hippocampal neurons to determine the neurotrophic and neuroprotective properties of CEEs. RESULTS Results of these analyses demonstrated that CEEs significantly increased hippocampal neuronal outgrowth, a cellular marker of memory formation. Dose response analyses indicated that the lowest effective concentration of CEEs exerted the maximal neurotrophic effect. Results of neuroprotection studies demonstrated that CEES induced highly significant neuroprotection against beta amyloid(25-35), hydrogen peroxide and glutamate-induced toxicity. CONCLUSIONS CEEs induced cellular markers of memory function in neurons critical to memory and vulnerable to negative effects of aging and Alzheimer's disease. In addition, CEEs significantly and potently protected neurons against toxic insults associated with Alzheimer's disease. Because CEEs are the estrogen replacement therapy of the Women's Health Initiative, results of the current study could provide cellular mechanisms for effects of CEEs on cognitive function and risk of Alzheimer's disease derived from this prospective clinical trial.
Collapse
Affiliation(s)
- R D Brinton
- Department of Molecular Pharmacology and Toxicology and the Program in Neuroscience, Pharmaceutical Sciences Center, University of Southern California, Los Angeles, CA 90033, USA.
| | | | | | | | | |
Collapse
|
43
|
Montoya M, Del Val M. Intracellular rate-limiting steps in MHC class I antigen processing. J Immunol 1999; 163:1914-22. [PMID: 10438926] [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] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Quantitative aspects of the endogenous pathway of Ag processing and presentation by MHC class I molecules to CD8+ CTL were analyzed over a wide range of Ag expression in recombinant vaccinia virus-infected cells expressing beta-galactosidase as model Ag. Only the amount of starting Ag was varied, leaving other factors unaltered. Below a certain level of Ag synthesis, increasing protein amounts led to a sharp rise in recognition by CTL. Higher levels of Ag expression led to a saturation point, which intracellularly limited the number of naturally processed peptides bound to MHC and thereby also CTL recognition. The rate-limiting step was located at the binding of the antigenic peptide to MHC inside the vaccinia virus-infected cell or before this event.
Collapse
MESH Headings
- Animals
- Antigen Presentation/genetics
- Antigens, Bacterial/biosynthesis
- Antigens, Bacterial/immunology
- Antigens, Bacterial/metabolism
- Antigens, Neoplasm/metabolism
- Cells, Cultured
- Cytotoxicity Tests, Immunologic
- Female
- Histocompatibility Antigens Class I/immunology
- Histocompatibility Antigens Class I/metabolism
- Intracellular Fluid/immunology
- Intracellular Fluid/metabolism
- Kinetics
- Mast-Cell Sarcoma/enzymology
- Mast-Cell Sarcoma/virology
- Mice
- Mice, Inbred BALB C
- Peptide Fragments/immunology
- Peptide Fragments/isolation & purification
- Peptide Fragments/metabolism
- T-Lymphocytes, Cytotoxic/enzymology
- T-Lymphocytes, Cytotoxic/immunology
- Tumor Cells, Cultured
- Vaccinia virus/genetics
- beta-Galactosidase/biosynthesis
- beta-Galactosidase/immunology
- beta-Galactosidase/metabolism
Collapse
Affiliation(s)
- M Montoya
- Centro Nacional de Biología Fundamental, Instituto de Salud Carlos III, Madrid, Spain
| | | |
Collapse
|
44
|
Raoult D, Birtles RJ, Montoya M, Perez E, Tissot-Dupont H, Roux V, Guerra H. Survey of three bacterial louse-associated diseases among rural Andean communities in Peru: prevalence of epidemic typhus, trench fever, and relapsing fever. Clin Infect Dis 1999; 29:434-6. [PMID: 10476755 DOI: 10.1086/520229] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.7] [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: 11/04/2022] Open
Abstract
Typhus and other louse-transmitted bacterial infections in Peruvian sierra communities are known to occur but have not recently been assessed. In this study, 194 of 1,280 inhabitants of four villages in Calca Province in the Urubamba Valley were included. Thirty-nine (20%) of the 194 volunteers had antibodies to Rickettsia prowazekii, whereas 24 (12%) had antibodies to Bartonella quintana and 2 against Borrelia recurrentis. There was a significant correlation between the presence of infesting ectoparasites and antibodies to R. prowazekii, as well as between antibodies to R. prowazekii and ectoparasite infestation and fever in the previous 6 months. The proportion of inhabitants infested with ectoparasites was significantly higher in the highest-altitude village than in the other three villages. Two volunteers' antibody levels suggested a recent typhus infection, but only B. quintana DNA was amplified from lice. Epidemic typhus remains extant in the area, and B. quintana infections were encountered and documented for the first time in South America.
Collapse
Affiliation(s)
- D Raoult
- Unité des Rickettsies, Faculté de Médecine, Université de la Méditerranée, Marseille, France.
| | | | | | | | | | | | | |
Collapse
|
45
|
Abstract
Results of this investigation demonstrate that exposure to 17 beta-estradiol differentially and significantly regulates cortical nerve cell outgrowth depending on the cortical region. Parietal and occipital neurons treated with 1 nM 17 beta-estradiol showed a greater magnitude of neuronal outgrowth whereas outgrowth of temporal cortex neurons was decreased in the presence of 1 nM 17 beta-estradiol. Frontal cortex neurons showed a consistent enhancement of neuronal outgrowth that did not reach statistical significance. The dose response profile for 17 beta-estradiol regulation of the macromorphological features exhibited a bimodal dose response relationship whereas the dose response profile for 17 beta-estradiol regulation of the micromorphological features exhibited a dose response more characteristic of an inverted V-shaped function. An antagonist to the NMDA receptor antagonist, AP5, abolished the growth promoting effect of 17 beta-estradiol whereas the nuclear estrogen receptor antagonist ICI 182,780 did not. Lastly, neocortical neurons exposed to 17 beta-estradiol exhibited greater viability and survival than control neurons over a two week period. These data indicate that 17 beta-estradiol can enhance the growth and viability of select populations of neocortical neurons and that the growth promoting effects of 17 beta-estradiol can be blocked by an antagonist to the NMDA glutamate receptor and not by an antagonist to the estrogen nuclear receptor.
Collapse
Affiliation(s)
- R D Brinton
- Department of Molecular Pharmacology and Toxicology, University of Southern California, Los Angeles 90033, USA.
| | | | | | | |
Collapse
|
46
|
Montoya M, Del Val M. Limiting factors in antigen presentation: Studies on the availability of antigen. Immunol Lett 1997. [DOI: 10.1016/s0165-2478(97)86063-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
47
|
Montoya M. Limiting factors in antigen presentation: Studies on the availability of antigen. Immunol Lett 1997. [DOI: 10.1016/s0165-2478(97)87901-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
|
48
|
Kelner MJ, McMorris TC, Estes L, Starr RJ, Rutherford M, Montoya M, Samson KM, Taetle R. Efficacy of Acylfulvene Illudin analogues against a metastatic lung carcinoma MV522 xenograft nonresponsive to traditional anticancer agents: retention of activity against various mdr phenotypes and unusual cytotoxicity against ERCC2 and ERCC3 DNA helicase-deficient cells. Cancer Res 1995; 55:4936-40. [PMID: 7585533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Four second-generation Illudin analogues were synthesized and tested for antitumor activity using a metastatic lung carcinoma xenograft model resistant to conventional antitumor agents. One analogue, the parent illudofulvene-derivative called Acylfulvene, inhibited xenograft primary tumor growth and prolonged life span of tumor-bearing animals when administered i.p. or i.v. The efficacy of Acylfulvene exceeded that of mitomycin C, cisplatin, paclitaxol, the parent compound Illudin S, and an earlier analogue, dehydroilludin M. Promising features of this new analogue are: (a) the retention of in vitro activity against a variety of mdr tumor phenotypes including gp170+, gp150+, GSHTR-Pi, topoisomerase I, and topoisomerase II mutants; and (b) an apparent selective cytotoxicity toward cells deficient in either ERCC2 or ERCC3 DNA helicase activity.
Collapse
Affiliation(s)
- M J Kelner
- Department of Pathology, UCSD Medical Center 92103-8320, USA
| | | | | | | | | | | | | | | |
Collapse
|
49
|
Kelner MJ, Bagnell R, Montoya M, Estes L, Uglik SF, Cerutti P. Transfection with human copper-zinc superoxide dismutase induces bidirectional alterations in other antioxidant enzymes, proteins, growth factor response, and paraquat resistance. Free Radic Biol Med 1995; 18:497-506. [PMID: 9101240 DOI: 10.1016/0891-5849(94)00167-i] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Transfection of a pSV2 human copper-zinc superoxide dismutase expression vector into murine fibroblasts resulted in stable transgenic clones producing increased amounts of copper-zinc superoxide dismutase. Two classes of transfectants were observed and were characterized by the presence or absence of an increase in endogenous glutathione peroxidase activity. In addition, increases and decreases in individual clones in the activities of manganese superoxide dismutase, glutathione reductase, and NADPH-reductase were detected. In general, these alterations in enzyme activity correlated to the cellular glutathione peroxidase/copper-zinc superoxide dismutase ratio. Parameters of cellular physiological functions were also altered, including cell division time, FGF and EGF response, fibronectin content, paraquat resistance, hydrogen peroxide release into media, and sensitivity to radiation. Some of these cellular parameters were also bidirectional and reflected the cellular glutathione peroxidase/copper-zinc superoxide dismutase ratio. Our results indicate that small deviations from the normal physiological copper-zinc superoxide dismutase/seleno-glutathione peroxidase ratios can have pronounced effects on other antioxidant enzymes, growth rate, growth factor response, and expression of proteins normally not associated with oxygen metabolism.
Collapse
Affiliation(s)
- M J Kelner
- University of California, San Diego 92103-8320, USA
| | | | | | | | | | | |
Collapse
|
50
|
Kelner MJ, McMorris TC, Estes L, Rutherford M, Montoya M, Goldstein J, Samson K, Starr R, Taetle R. Characterization of illudin S sensitivity in DNA repair-deficient Chinese hamster cells. Unusually high sensitivity of ERCC2 and ERCC3 DNA helicase-deficient mutants in comparison to other chemotherapeutic agents. Biochem Pharmacol 1994; 48:403-9. [PMID: 8053936 DOI: 10.1016/0006-2952(94)90113-9] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.5] [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: 01/28/2023]
Abstract
Illudins, novel natural products with a structure unrelated to any other known chemical, display potent in vitro and in vivo anti-cancer activity against even multi-drug resistant tumors, and are metabolically activated to an unstable intermediate that binds to DNA. The DNA damage produced by illudins, however, appears to differ from that of other known DNA damaging toxins. The sensitivity pattern of the various UV-sensitive cell lines differs from previously studied DNA cross-linking agents. Normally, the ERCC1- (excision repair cross complementing) and ERCC4-deficient cell lines are most sensitive to DNA cross-linking agents, with ERCC2-, ERCC3- and ERCC5-deficient cell lines having minimal sensitivity. With illudins the pattern is reversed, with ERCC2 and ERCC3 being the most sensitive. The sensitivity to illudins in complementation groups 1 through 3 is due to a deficiency of the ERCC1-3 gene products, as cellular drug accumulation studies revealed no differences in transport capacity or total drug accumulation. Also, a transgenic cell line in which ERCC2 activity was expressed through an expression vector regained its relative resistance to the illudins. The EM9 cell line, which displays sensitivity to monoadduct producing chemicals, was not sensitive. Thus, excision repair is involved in repair of illudin-induced damage and, unlike other anti-cancer agents, the involvement of ERCC2 and ERCC3 helicases is critical for repair to occur. The requirement for ERCC2 and ERCC3, combined with the finding that ERCC1 but not ERCC2 is upregulated in drug-resistant tumors, may explain the efficacy of illudins against drug-resistant tumors. The inhibition of DNA synthesis in cells within minutes after exposure to illudins at nanomolar concentrations may be related to the finding that the ERCC3 gene product is actually the p89 helicase component of the BTF2 (TFII) basic transcription factor and the high sensitivity of ERCC3-deficient cells to illudins.
Collapse
Affiliation(s)
- M J Kelner
- Department of Pathology, University of California, San Diego 92103-8320
| | | | | | | | | | | | | | | | | |
Collapse
|