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Monroy Y, García MA, Deladino L, Rivero S. Valorization of a by-product of the yerba mate industry by assembling with cassava starch adhesive for packaging material production. Int J Biol Macromol 2024; 266:131271. [PMID: 38556239 DOI: 10.1016/j.ijbiomac.2024.131271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2024] [Revised: 03/14/2024] [Accepted: 03/28/2024] [Indexed: 04/02/2024]
Abstract
Yerba mate industrial processing produces tons of powder as a by-product, this yerba mate powder (YMP) is an excellent source of biomass to develop biodegradable materials. Cassava starch modified with 1,2,3,4-butane tetracarboxylic acid (BA) in the presence of sodium propionate as a catalyst is an eco-friendly option to obtain bioadhesives. This work aimed to develop sustainable laminates from starch-based adhesives and yerba mate powder and to study their physico-chemical, structural, and mechanical properties. Blends of bioadhesive and YMP were prepared (1:1, adhesive:YMP). Monolayer materials were obtained by thermo-compression and later assembled with adhesive to obtain bilayer laminates. Bioadhesive was able to bind the yerba mate by-product fibers, as evidenced by SEM microstructure analysis, the interactions of adhesive:substrate were elucidated by ATR-FTIR and supported by chemometrics analysis. The incorporation of the catalyst decreased the rugosity of materials and their mechanical performance was improved by the action of both acid concentration and catalyst presence, requiring higher energy for puncture. Thus, it was feasible to obtain mono and bilayer laminates as an eco-compatible alternative for the design of sustainable tray-like materials based on the industrial by-product of yerba mate.
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Affiliation(s)
- Y Monroy
- CIDCA (Centro de Investigación y Desarrollo en Criotecnología de Alimentos), 47 y 116 S/N, La Plata, B1900AJJ Buenos Aires, Argentina; Centro Científico Tecnológico La Plata (CCT-La Plata) CONICET, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA), Argentina
| | - M A García
- CIDCA (Centro de Investigación y Desarrollo en Criotecnología de Alimentos), 47 y 116 S/N, La Plata, B1900AJJ Buenos Aires, Argentina; Centro Científico Tecnológico La Plata (CCT-La Plata) CONICET, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA), Argentina; Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), Argentina
| | - L Deladino
- CIDCA (Centro de Investigación y Desarrollo en Criotecnología de Alimentos), 47 y 116 S/N, La Plata, B1900AJJ Buenos Aires, Argentina; Centro Científico Tecnológico La Plata (CCT-La Plata) CONICET, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA), Argentina; Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), Argentina
| | - S Rivero
- CIDCA (Centro de Investigación y Desarrollo en Criotecnología de Alimentos), 47 y 116 S/N, La Plata, B1900AJJ Buenos Aires, Argentina; Centro Científico Tecnológico La Plata (CCT-La Plata) CONICET, Comisión de Investigaciones Científicas de la Provincia de Buenos Aires (CICPBA), Argentina; Facultad de Ciencias Exactas, Universidad Nacional de La Plata (UNLP), Argentina.
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Díez MC, Przyborski S, Del Cerro A, Alonso-Guervós M, Iglesias-Cabo T, Carrocera S, García MA, Fernández M, Alonso L, Muñoz M. Generation of a novel three-dimensional scaffold-based model of the bovine endometrium. Vet Res Commun 2023; 47:1721-1733. [PMID: 37154859 PMCID: PMC10484811 DOI: 10.1007/s11259-023-10130-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2023] [Accepted: 04/20/2023] [Indexed: 05/10/2023]
Abstract
Bovine in vitro endometrial models that resemble tissue function in vivo are needed to study infertility, long-term uterine alterations induced by pathogens and impact of endocrine disruptor chemicals on reproductive function and other reproductive system complications that cause high economic losses in livestock species. The present study aimed to generate an innovative, reproducible, and functional 3D scaffold-based model of the bovine endometrium structurally robust for long term-culture. We developed a multicellular model containing both endometrial epithelial and stromal cells. Epithelial cells organized to form a luminal-like epithelial layer on the surface of the scaffold. Stromal cells produced their own extracellular matrix forming a stable subepithelial compartment that physiologically resembles the normal endometrium. Both cell types released prostaglandin E2 and prostaglandin F2α following a treatment with oxytocin and arachidonic acid. Additionally signal pathways mediating oxytocin and arachidonic acid stimulation of prostaglandin synthesis were analyzed by real time PCR (RT-PCR). Oxytocin receptor (OXTR), prostaglandin E2 receptor 2 (EP2), prostaglandin E2 receptor 4 (EP4), prostaglandin F receptor (PTGFR), prostaglandin E synthase (PTGES), PGF-synthase (PGFS) and prostaglandin-endoperoxide synthase 2 (COX-2) expression was detected in both control and treatment groups, however, only significant changes in abundance of OXTR mRNA transcripts were found. The results obtained by this study are a step forward in bovine in vitro culture technology. This 3D scaffold-based model provides a platform to study regulatory mechanisms involved in endometrial physiology and can set the basis for a broader tool for designing and testing novel therapeutic strategies for recurrent uterine pathologies.
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Affiliation(s)
- M C Díez
- Servicio Regional de Investigación y Desarrollo Agroalimentario (SERIDA), Área de Genética y Reproducción Animal. Camino de Rioseco, Deva Gijón, 1225 - 33394, Asturias, Spain
| | - S Przyborski
- Department of Bioscience, Durham University, Durham, DH1 3LE, UK
| | - A Del Cerro
- Servicio Regional de Investigación y Desarrollo Agroalimentario (SERIDA), Área de Genética y Reproducción Animal. Camino de Rioseco, Deva Gijón, 1225 - 33394, Asturias, Spain
| | - M Alonso-Guervós
- Optical Microscopy and Image Processing Unit, Scientific-Technical Services, University of Oviedo, Asturias, Spain
| | - T Iglesias-Cabo
- Scientific-Technical Services, Statistical Consulting Unit, University of Oviedo, Asturias, Spain
| | - S Carrocera
- Servicio Regional de Investigación y Desarrollo Agroalimentario (SERIDA), Área de Genética y Reproducción Animal. Camino de Rioseco, Deva Gijón, 1225 - 33394, Asturias, Spain
| | - M A García
- Servicio Regional de Investigación y Desarrollo Agroalimentario (SERIDA), Área de Genética y Reproducción Animal. Camino de Rioseco, Deva Gijón, 1225 - 33394, Asturias, Spain
| | - M Fernández
- Asociación. Española de Criadores de Ganado Vacuno Selecto Raza Asturiana de los Valles, Asturias, Spain
| | - L Alonso
- Matadero Central de Asturias, Asturias, Spain
| | - M Muñoz
- Servicio Regional de Investigación y Desarrollo Agroalimentario (SERIDA), Área de Genética y Reproducción Animal. Camino de Rioseco, Deva Gijón, 1225 - 33394, Asturias, Spain.
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Greño M, Amariei G, Boltes K, Castro-Puyana M, García MA, Marina ML. Ecotoxicity evaluation of tetramethrin and analysis in agrochemical formulations using chiral electrokinetic chromatography. Sci Total Environ 2021; 800:149496. [PMID: 34388647 DOI: 10.1016/j.scitotenv.2021.149496] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Revised: 08/02/2021] [Accepted: 08/02/2021] [Indexed: 06/13/2023]
Abstract
The separation of the four isomers of tetramethrin was performed for the first time using a cyclodextrin-micellar electrokinetic chromatography methodology. Using sodium deoxycholate and 2-hydroxypropyl-β-CD as chiral selectors, tetramethrin isomers were separated with resolution values of 1.7 and 1.1 for trans- and cis-isomers, respectively, in analysis times lower than 12.5 min. Once developed and optimized, the analytical method was applied to the analysis of an antiparasitic commercial formulation and to the evaluation of the stability and ecotoxicity of tetramethrin. Using measured concentrations, the stability was assessed at enantiomeric level and the ecotoxicological parameters on Daphnia magna were determined. Tetramethrin presents toxicity on aquatic microinvertebrates, with EC50 (t = 72 h) of 1.8 mg/L. The acute toxicity of tetrametrin was attributed to the trans-1 enantiomer. The first evidence of oxidative stress-mediated mode of action for tetramethrin on Daphnia magna is reported in the present work.
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Affiliation(s)
- M Greño
- Universidad de Alcalá, Departamento de Química Analítica, Química Física e Ingeniería Química, Ctra. Madrid-Barcelona Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain
| | - G Amariei
- Universidad de Alcalá, Departamento de Química Analítica, Química Física e Ingeniería Química, Ctra. Madrid-Barcelona Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain
| | - K Boltes
- Universidad de Alcalá, Departamento de Química Analítica, Química Física e Ingeniería Química, Ctra. Madrid-Barcelona Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain; Madrid Institute for Advanced Studies of Water (IMDEA Agua), Parque Científico Tecnológico, E-28805 Alcalá de Henares, Madrid, Spain
| | - M Castro-Puyana
- Universidad de Alcalá, Departamento de Química Analítica, Química Física e Ingeniería Química, Ctra. Madrid-Barcelona Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain; Universidad de Alcalá, Instituto de Investigación Química Andrés M. del Río, Ctra. Madrid-Barcelona Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain
| | - M A García
- Universidad de Alcalá, Departamento de Química Analítica, Química Física e Ingeniería Química, Ctra. Madrid-Barcelona Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain; Universidad de Alcalá, Instituto de Investigación Química Andrés M. del Río, Ctra. Madrid-Barcelona Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain
| | - M L Marina
- Universidad de Alcalá, Departamento de Química Analítica, Química Física e Ingeniería Química, Ctra. Madrid-Barcelona Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain; Universidad de Alcalá, Instituto de Investigación Química Andrés M. del Río, Ctra. Madrid-Barcelona Km. 33.600, 28871 Alcalá de Henares, Madrid, Spain.
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Dini C, Quiroga AV, Viña SZ, García MA. Extraction and Characterization of Proteins from Pachyrhizus ahipa Roots: an Unexploited Protein-Rich Crop. Plant Foods Hum Nutr 2021; 76:179-188. [PMID: 33755896 DOI: 10.1007/s11130-021-00890-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 03/11/2021] [Indexed: 05/14/2023]
Abstract
Pachyrhizus ahipa is an unexploited crop known to be rich in proteins compared to other edible roots and tubers. These proteins are not prolamins, thus ahipa represents an interesting new source of ingredients for gluten-free foods. In this work, ahipa proteins (AP) were extracted and partially characterized in pursuit of their use as food ingredients. The effect of ultrasound treatment on protein extraction efficiency was evaluated. AP were characterized by their size, amino acid composition, surface hydrophobicity, intrinsic fluorescence, FTIR spectra, solubility, and thermal and emulsifying properties. AP were efficiently removed from the vegetal tissue using PBS or water, regardless of the use of ultrasound, but not easily recovered by precipitation. This protein fraction was composed of small proteins, with sizes ranging from 9 to 30 kDa, and highly polar. AP resulted particularly rich in aspartic acid (59% of the total amino acid content), for which they can be classified as Asp-rich proteins. Their elevated content of acidic groups was evidenced in the ATR-FTIR spectrum. The amide I band deconvolution as well as the low surface hydrophobicity and denaturation enthalpy indicated that these proteins are mainly unordered structures. The emulsifying properties of AP were enhanced when the concentration was increased from 0.1 to 1% (w/v) but resulted lower than those of soy protein. The high polarity, small size, and low isoelectric point make AP particularly suitable for acidic food matrices.
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Affiliation(s)
- Cecilia Dini
- CIDCA (Centro de Investigación y Desarrollo en Criotecnología de Alimentos), Facultad de Ciencias Exactas UNLP - CONICET La Plata - CICPBA, 47 y 116 S/N, 1900, La Plata, Buenos Aires, Argentina.
| | - A V Quiroga
- CIDCA (Centro de Investigación y Desarrollo en Criotecnología de Alimentos), Facultad de Ciencias Exactas UNLP - CONICET La Plata - CICPBA, 47 y 116 S/N, 1900, La Plata, Buenos Aires, Argentina
| | - S Z Viña
- CIDCA (Centro de Investigación y Desarrollo en Criotecnología de Alimentos), Facultad de Ciencias Exactas UNLP - CONICET La Plata - CICPBA, 47 y 116 S/N, 1900, La Plata, Buenos Aires, Argentina
- Curso de Bioquímica y Fitoquímica, Facultad de Ciencias Agrarias y Forestales, Universidad Nacional de La Plata, 60 y 119 S/N, 1900, La Plata, Buenos Aires, Argentina
| | - M A García
- CIDCA (Centro de Investigación y Desarrollo en Criotecnología de Alimentos), Facultad de Ciencias Exactas UNLP - CONICET La Plata - CICPBA, 47 y 116 S/N, 1900, La Plata, Buenos Aires, Argentina
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Blondon M, Jimenez D, Robert‐Ebadi H, Del Toro J, Lopez‐Jimenez L, Falga C, Skride A, Font L, Vazquez FJ, Bounameaux H, Monreal M, Prandoni P, Brenner, B, Farge‐Bancel D, Barba R, Di Micco P, Bertoletti L, Schellong S, Tzoran I, Reis A, Bosevski M, Malý R, Verhamme P, Caprini JA, My Bui H, Adarraga MD, Agud M, Aibar J, Aibar MA, Alfonso J, Amado C, Arcelus JI, Baeza C, Ballaz A, Barba R, Barbagelata C, Barrón M, Barrón‐Andrés B, Blanco‐Molina A, Botella E, Camon AM, Castro J, Caudevilla MA, Cerdà P, Chasco L, Criado J, de Ancos C, de Miguel J, Demelo‐Rodríguez P, Díaz‐Peromingo JA, Díez‐Sierra J, Díaz‐Simón R, Domínguez IM, Encabo M, Escribano JC, Falgá C, Farfán AI, Fernández‐Capitán C, Fernández‐Reyes JL, Fidalgo MA, Flores K, Font C, Francisco I, Gabara C, Galeano‐Valle F, García MA, García‐Bragado F, García‐Mullor MM, Gavín‐Blanco O, Gavín‐Sebastián O, Gil‐Díaz A, Gómez‐Cuervo C, González‐Martínez J, Grau E, Guirado L, Gutiérrez J, Hernández‐Blasco L, Jara‐Palomares L, Jaras MJ, Jiménez D, Joya MD, Jou I, Lacruz B, Lecumberri R, Lima J, Lobo JL, López‐Brull H, López‐Jiménez L, López‐Miguel P, López‐Núñez JJ, López‐Reyes R, López‐Sáez JB, Lorente MA, Lorenzo A, Loring M, Madridano O, Maestre A, Marchena PJ, Martín del Pozo M, Martín‐Martos F, Martínez‐Baquerizo C, Mella C, Mellado M, Mercado MI, Moisés J, Morales MV, Muñoz‐Blanco A, Muñoz‐Guglielmetti D, Muñoz‐Rivas N, Nart E, Nieto JA, Núñez MJ, Olivares MC, Ortega‐Michel C, Ortega‐Recio MD, Osorio J, Otalora S, Otero R, Parra P, Parra V, Pedrajas JM, Pellejero G, Pérez‐Jacoiste A, Peris ML, Pesántez D, Porras JA, Portillo J, Reig L, Riera‐Mestre A, Rivas A, Rodríguez‐Cobo A, Rodríguez‐Matute C, Rogado J, Rosa V, Rubio CM, Ruiz‐Artacho P, Ruiz‐Giménez N, Ruiz‐Ruiz J, Ruiz‐Sada P, Sahuquillo JC, Salgueiro G, Sampériz A, Sánchez‐Muñoz‐Torrero JF, Sancho T, Sigüenza P, Sirisi M, Soler S, Suárez S, Suriñach JM, Tiberio G, Torres MI, Tolosa C, Trujillo‐Santos J, Uresandi F, Usandizaga E, Valle R, Vela JR, Vidal G, Vilar C, Villares P, Zamora C, Gutiérrez P, Vázquez FJ, Vanassche T, Vandenbriele C, Verhamme P, Hirmerova J, Malý R, Salgado E, Benzidia I, Bertoletti L, Bura‐Riviere A, Crichi B, Debourdeau P, Espitia O, Farge‐Bancel D, Helfer H, Mahé I, Moustafa F, Poenou G, Schellong S, Braester A, Brenner B, Tzoran I, Amitrano M, Bilora F, Bortoluzzi C, Brandolin B, Ciammaichella M, Colaizzo D, Dentali F, Di Micco P, Giammarino E, Grandone E, Mangiacapra S, Mastroiacovo D, Maida R, Mumoli N, Pace F, Pesavento R, Pomero F, Prandoni P, Quintavalla R, Rocci A, Siniscalchi C, Tufano A, Visonà A, Vo Hong N, Zalunardo B, Kalejs RV, Maķe K, Ferreira M, Fonseca S, Martins F, Meireles J, Bosevski M, Zdraveska M, Mazzolai L, Caprini JA, Tafur AJ, Weinberg I, Wilkins H, Bui HM. Comparative clinical prognosis of massive and non-massive pulmonary embolism: A registry-based cohort study. J Thromb Haemost 2021; 19:408-416. [PMID: 33119949 DOI: 10.1111/jth.15146] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 09/29/2020] [Accepted: 10/21/2020] [Indexed: 01/16/2023]
Abstract
AIMS Little is known about the prognosis of patients with massive pulmonary embolism (PE) and its risk of recurrent venous thromboembolism (VTE) compared with non-massive PE, which may inform clinical decisions. Our aim was to compare the risk of recurrent VTE, bleeding, and mortality after massive and non-massive PE during anticoagulation and after its discontinuation. METHODS AND RESULTS We included all participants in the RIETE registry who suffered a symptomatic, objectively confirmed segmental or more central PE. Massive PE was defined by a systolic hypotension at clinical presentation (<90 mm Hg). We compared the risks of recurrent VTE, major bleeding, and mortality using time-to-event multivariable competing risk modeling. There were 3.5% of massive PE among 38 996 patients with PE. During the anticoagulation period, massive PE was associated with a greater risk of major bleeding (subhazard ratio [sHR] 1.72, 95% confidence interval [CI] 1.28-2.32), but not of recurrent VTE (sHR 1.15, 95% CI 0.75-1.74) than non-massive PE. An increased risk of mortality was only observed in the first month after PE. After discontinuation of anticoagulation, among 11 579 patients, massive PE and non-massive PE had similar risks of mortality, bleeding, and recurrent VTE (sHR 0.85, 95% CI 0.51-1.40), but with different case fatality of recurrent PE (11.1% versus 2.4%, P = .03) and possibly different risk of recurrent fatal PE (sHR 3.65, 95% CI 0.82-16.24). CONCLUSION In this large prospective registry, the baseline hemodynamic status of the incident PE did not influence the risk of recurrent VTE, during and after the anticoagulation periods, but was possibly associated with recurrent PE of greater severity.
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Affiliation(s)
- Marc Blondon
- Division of Angiology and Hemostasis Geneva University Hospitals and Faculty of Medicine Geneva Switzerland
| | - David Jimenez
- Respiratory Department Hospital Ramón y Cajal and Medicine Department Universidad de Alcalá (IRYCIS) Madrid Spain
| | - Helia Robert‐Ebadi
- Division of Angiology and Hemostasis Geneva University Hospitals and Faculty of Medicine Geneva Switzerland
| | - Jorge Del Toro
- Department of Internal Medicine Hospital General Universitario Gregorio Marañón Madrid Spain
| | | | - Conxita Falga
- Department of Internal Medicine Hospital de Mataro Barcelona Spain
| | - Andris Skride
- Department of Cardiology Ospedale Pauls Stradins Clinical University Hospital Riga Latvia
| | - Llorenç Font
- Department of Haematology Hospital de Tortosa Verge de la Cinta Tarragona Spain
| | | | - Henri Bounameaux
- Division of Angiology and Hemostasis Geneva University Hospitals and Faculty of Medicine Geneva Switzerland
| | - Manuel Monreal
- Department of Internal Medicine Hospital Germans Trias i Pujol Badalona Spain
- Universidad Catolica de Murcia Murcia Spain
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Babini A, Cappuccio AM, Caprarulo C, Casado G, Eimon A, Figueredo H, García MA, Magri S, Mannucci P, Perez Rodriguez S, Pons-Estel BA, Velozo EJ, Iglesias-Rodriguez M, Streger G. Evaluation of belimumab treatment in patients with systemic lupus erythematosus in a clinical practice setting: Results from a 24-month OBSErve study in Argentina. Lupus 2020; 29:1385-1396. [PMID: 32791930 PMCID: PMC7536527 DOI: 10.1177/0961203320947814] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Objective To describe clinical effectiveness of belimumab for systemic lupus
erythematosus (SLE) in real-world practice in Argentina. Methods This retrospective, observational study analysed medical record data of
patients with SLE treated with belimumab in 15 centres in Argentina. Primary
endpoint: overall clinical response (assessed on a scale similar to the
6-point Physician Global Assessment) at months 6, 12, 18 and 24, all versus
index (belimumab initiation). Secondary endpoints: improvement in disease
activity (SELENA-SLEDAI), SLE manifestations, and corticosteroid dose
change. Results Records for 81 patients (91% female) were analysed. Clinical improvements
were reported for 95%, 95%, 98% and 100% patients at 6, 12, 18, and
24 months post index, respectively. Mean SELENA-SLEDAI score decreased from
11.21 at index to 4.76, 3.77, 3.86 and 2.17 at 6, 12, 18, and 24 months post
index, respectively. Number of flares decreased from 1.05 at index to 0.21,
0.09, 0.22 and 0.30 at 6, 12, 18, and 24 months post index, respectively.
Mean corticosteroid dose was 14.59 mg/day at index, and 6.45, 5.18, 5.17 and
4.78 mg/day at 6, 12, 18, and 24 months post index, respectively. Conclusions Real-world patients with SLE treated with belimumab in Argentina demonstrated
clinical improvements and reductions in corticosteroid dose.
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Affiliation(s)
- A Babini
- Hospital Italiano de Córdoba, Córdoba, Argentina
| | | | - C Caprarulo
- Consultorio Privado, Concordia, Entre Rios, Argentina
| | - G Casado
- Servicio de Reumatología, Hospital Militar Central, Buenos Aires, Argentina
| | - A Eimon
- CEMIC, Buenos Aires, Argentina
| | - H Figueredo
- Hospital de Alta Complejidad 'Pte. Juan Domingo Perón', Formosa, Argentina
| | - M A García
- Hospital Interzonal General de Agudos José de San Martín, La Plata, Argentina
| | - S Magri
- Hospital Italiano de La Plata, Buenos Aires, Argentina
| | - P Mannucci
- Aprillus Asistencia e Investigación de Arcis Salud SRL, Buenos Aires, Argentina
| | | | - B A Pons-Estel
- Centro Regional de Enfermedades Autoinmunes y Reumáticas (CREAR), Grupo Oroño, Sanatorio Parque, Rosario, Santa Fé, Argentina
| | - E J Velozo
- Unidad de Reumatologia, Universidad y Sanatorio Adventista del Plata, Entre Rios, Argentina
| | | | - G Streger
- Immunology & Specialty Medicine, GSK, Buenos Aires, Argentina
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Avnery O, Martin M, Bura-Riviere A, Barillari G, Mazzolai L, Mahé I, Marchena PJ, Verhamme P, Monreal M, Ellis MH, Aibar MA, Aibar J, Amado C, Arcelus JI, Ballaz A, Barba R, Barrón M, Barrón‐Andrés B, Bascuñana J, ina A, Camon AM, Cañas I, Carrasco C, Castro J, Ancos C, Toro J, Demelo P, Díaz‐Peromingo JA, Falgá C, Farfán AI, Fernández‐Capitán C, Fernández‐Criado MC, Fernández‐Núñez S, Fidalgo MA, Font C, Font L, Freire M, Gallego M, García MA, García‐Bragado F, García‐Morillo M, García‐Raso A, Gavín O, Gayol MC, Gil‐Díaz A, Gómez V, Gómez‐Cuervo C, González‐Martínez J, Grau E, Gutiérrez J, Hernández‐Blasco LM, Iglesias M, Jara‐Palomares L, Jaras MJ, Jiménez R, Jiménez‐Castro D, Jiménez‐López J, Joya MD, Lima J, Llamas P, Lobo JL, López‐Jiménez L, López‐Miguel P, López‐Núñez JJ, López‐Reyes R, López‐Sáez JB, Lorente MA, Lorenzo A, Loring M, Madridano O, Maestre A, Martín del Pozo M, Martín‐Guerra JM, Martín‐Romero M, Mellado M, Morales MV, Muñoz N, Nieto‐Cabrera MA, Nieto‐Rodríguez JA, Núñez‐Ares A, Núñez MJ, Olivares MC, Otalora S, Otero R, Pedrajas JM, Pellejero G, Pérez‐Rus G, Peris ML, Porras JA, Rivas A, Rodríguez‐Dávila MA, Rodríguez‐Hernández A, Rubio CM, Ruiz‐Artacho P, Ruiz‐Ruiz J, Ruiz‐Torregrosa P, Ruiz‐Sada P, Sahuquillo JC, Salazar V, Sampériz A, Sánchez‐Muñoz‐Torrero JF, Sancho T, Soler S, Sopeña B, Suriñach JM, Tolosa C, Torres MI, Trujillo‐Santos J, Uresandi F, Valle R, Vidal G, Villares P, Gutiérrez P, Vázquez FJ, Vilaseca A, Vanassche T, Vandenbriele C, Hirmerova J, Malý R, Salgado E, Benzidia I, Bertoletti L, Debourdeau P, Farge‐Bancel D, Hij A, Moustafa F, Schellong S, Braester A, Brenner B, Tzoran I, Sharif‐Kashani B, Bilora F, Bortoluzzi C, Bucherini E, Ciammaichella M, Dentali F, Di Micco P, Di Pangrazio M, Maida R, Mastroiacovo D, Pace F, Pallotti G, Parisi R, Pesavento R, Prandoni P, Quintavalla R, Rocci A, Siniscalchi C, Tufano A, Visonà A, Vo Hong N, Gibietis V, Skride A, Strautmane S, Bosevski M, Zdraveska M, Bounameaux H, Fresa M, Ney B, Caprini J, Bui HM, Pham KQ. D-dimer levels and risk of recurrence following provoked venous thromboembolism: findings from the RIETE registry. J Intern Med 2020; 287:32-41. [PMID: 31394000 DOI: 10.1111/joim.12969] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Patients with venous thromboembolism (VTE) secondary to transient risk factors may develop VTE recurrences after discontinuing anticoagulation. Identifying at-risk patients could help to guide the duration of therapy. METHODS We used the RIETE database to assess the prognostic value of d-dimer testing after discontinuing anticoagulation to identify patients at increased risk for recurrences. Transient risk factors were classified as major (postoperative) or minor (pregnancy, oestrogen use, immobilization or recent travel). RESULTS In December 2018, 1655 VTE patients with transient risk factors (major 460, minor 1195) underwent d-dimer measurements after discontinuing anticoagulation. Amongst patients with major risk factors, the recurrence rate was 5.74 (95% CI: 3.19-9.57) events per 100 patient-years in those with raised d-dimer levels and 2.68 (95% CI: 1.45-4.56) in those with normal levels. Amongst patients with minor risk factors, the rates were 7.79 (95% CI: 5.71-10.4) and 3.34 (95% CI: 2.39-4.53), respectively. Patients with major risk factors and raised d-dimer levels (n = 171) had a nonsignificantly higher rate of recurrences (hazard ratio [HR]: 2.14; 95% CI: 0.96-4.79) than those with normal levels. Patients with minor risk factors and raised d-dimer levels (n = 382) had a higher rate of recurrences (HR: 2.34; 95% CI: 1.51-3.63) than those with normal levels. On multivariate analysis, raised d-dimers (HR: 1.74; 95% CI: 1.09-2.77) were associated with an increased risk for recurrences in patients with minor risk factors, not in those with major risk factors. CONCLUSIONS Patients with raised d-dimer levels after discontinuing anticoagulant therapy for VTE provoked by a minor transient risk factor were at an increased risk for recurrences.
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Affiliation(s)
- O Avnery
- Meir Medical Center, Hematology Institute and Blood Bank, Kfar Saba, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - M Martin
- Hospital Infanta Sofia San Sebastian de los Reyes and Universidad Europea de Madrid, Madrid, Spain
| | - A Bura-Riviere
- Department of Vascular Medicine, Hôpital de Rangueil, Toulouse, France
| | - G Barillari
- Department of Internal Medicine, Ospedale S. Maria della Misericordia, Udine, Italy
| | - L Mazzolai
- Department of Angiology, Centre Hospitalier Universitaire Vaudois (CHUV), Lausanne, Switzerland
| | - I Mahé
- Department of Internal Medicine, Hôpital Louis Mourier, Colombes (APHP), University Paris 7, Colombes, France
| | - P J Marchena
- Department of Internal Medicine and Emergency, Parc Sanitari Sant Joan de Deu-Hospital General, Barcelona, Spain
| | - P Verhamme
- Vascular Medicine and Haemostasis, University of Leuven, Leuven, Belgium
| | - M Monreal
- Hospital Universitari Germans Trias i Pujol, Badalona, Barcelona, Spain
| | - M H Ellis
- Meir Medical Center, Hematology Institute and Blood Bank, Kfar Saba, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
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Morillo Martín D, Diaz Jalaff L, García MA, Faccini M. Selective Recovery of Europium and Yttrium Ions with Cyanex 272-Polyacrylonitrile Nanofibers. Nanomaterials (Basel) 2019; 9:nano9121648. [PMID: 31757000 PMCID: PMC6955798 DOI: 10.3390/nano9121648] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/08/2019] [Accepted: 11/12/2019] [Indexed: 11/18/2022]
Abstract
Rare earth elements (REEs), which include lanthanides as yttrium and europium became crucial in the last decade in many sectors like automotive, energy, and defense. They contribute to the increment efficiency and performance of different products. In this paper nanofiber membranes have been successfully applied for the selective recovery of Eu(III) and Y(III) from aqueous solutions. Polyacrylonitrile (PAN) electrospun nanofibers were impregnated with a commercial organic extractant, Cyanex 272, in order to increase their affinity to rare earth metals ions. The coated nanofibers were characterized by SEM, ATR-FTIR, and TGA. Firstly, the adsorption of Eu(III) and Y(III) were evaluated in batch mode. Experimental data showed that the adsorption of Y(III) and Eu(III) corresponds to pseudo-second order model, with Langmuir sorption model being the best fit for both target ions. The results demonstrated that the adsorption capacity was high, showing a maximum capacity of 200 and 400 mg/g for Y(III) and Eu(III), respectively. Additionally, the presence of interfering ions does not show significative effects in the adsorption process. Finally, experiments in continuous mode indicated that the adsorption of the target elements is close to 100%, showing that PAN-272 is a promising material for the recovery of earth metal ions.
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Affiliation(s)
- Diego Morillo Martín
- Applied Chemistry & Materials, LEITAT Technological Center, C/Pallars, 179-185, 08005 Barcelona, Spain;
| | - Leslie Diaz Jalaff
- R&D Department, Leitat Chile, Román Díaz 532, Providencia, Santiago 7500724, Chile; (L.D.J.); (M.A.G.)
- Centro de Excelencia en Nanotecnología (CEN) Chile, Román Diaz 532, Providencia, Santiago 7500724, Chile
| | - Maria A. García
- R&D Department, Leitat Chile, Román Díaz 532, Providencia, Santiago 7500724, Chile; (L.D.J.); (M.A.G.)
- Centro de Excelencia en Nanotecnología (CEN) Chile, Román Diaz 532, Providencia, Santiago 7500724, Chile
| | - Mirko Faccini
- Applied Chemistry & Materials, LEITAT Technological Center, C/Pallars, 179-185, 08005 Barcelona, Spain;
- R&D Department, Leitat Chile, Román Díaz 532, Providencia, Santiago 7500724, Chile; (L.D.J.); (M.A.G.)
- Correspondence: ; Tel.: +34-93-788-2300; Fax: +34-93-789-1906
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Pimentel-Quiroz VR, Ugarte-Gil MF, Harvey GB, Wojdyla D, Pons-Estel GJ, Quintana R, Esposto A, García MA, Catoggio LJ, Cardiel MH, Barile LA, Amigo MC, Sato EI, Bonfa E, Borba E, Lavras Costallat LT, Neira OJ, Massardo L, Guibert-Toledano M, Chacón-Díaz R, Alarcón GS, Pons-Estel BA. Factors predictive of serious infections over time in systemic lupus erythematosus patients: data from a multi-ethnic, multi-national, Latin American lupus cohort. Lupus 2019; 28:1101-1110. [DOI: 10.1177/0961203319860579] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Aim The aim of this study was to identify factors predictive of serious infections over time in patients with systemic lupus erythematosus (SLE). Methods A multi-ethnic, multi-national Latin American SLE cohort was studied. Serious infection was defined as one that required hospitalization, occurred during a hospitalization or led to death. Potential predictors included were sociodemographic factors, clinical manifestations (per organ involved, lymphopenia and leukopenia, independently) and previous infections at baseline. Disease activity (SLEDAI), damage (SLICC/ACR Damage Index), non-serious infections, glucocorticoids, antimalarials (users and non-users), and immunosuppressive drugs use; the last six variables were examined as time-dependent covariates. Cox regression models were used to evaluate the predictors of serious infections using a backward elimination procedure. Univariable and multivariable analyses were performed. Results Of the 1243 patients included, 1116 (89.8%) were female. The median (interquartile range) age at diagnosis and follow-up time were 27 (20–37) years and 47.8 (17.9–68.6) months, respectively. The incidence rate of serious infections was 3.8 cases per 100 person-years. Antimalarial use (hazard ratio: 0.69; 95% confidence interval (CI): 0.48–0.99; p = 0.0440) was protective, while doses of prednisone >15 and ≤60 mg/day (hazard ratio: 4.18; 95 %CI: 1.69–10.31; p = 0.0019) and >60 mg/day (hazard ratio: 4.71; 95% CI: 1.35–16.49; p = 0.0153), use of methylprednisolone pulses (hazard ratio: 1.53; 95% CI: 1.10–2.13; p = 0.0124), increase in disease activity (hazard ratio: 1.03; 95% CI: 1.01–1.04; p = 0.0016) and damage accrual (hazard ratio: 1.22; 95% CI: 1.11–1.34; p < 0.0001) were predictive factors of serious infections. Conclusions Over time, prednisone doses higher than 15 mg/day, use of methylprednisolone pulses, increase in disease activity and damage accrual were predictive of infections, whereas antimalarial use was protective against them in SLE patients.
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Affiliation(s)
- V R Pimentel-Quiroz
- Department of Rheumatology, Hospital Nacional ‘Guillermo Almenara Irigoyen’ Essalud, Lima, Peru
| | - M F Ugarte-Gil
- Department of Rheumatology, Hospital Nacional ‘Guillermo Almenara Irigoyen’ Essalud, Lima, Peru
- Universidad Científica del Sur, Lima, Peru
| | - GB Harvey
- Escuela de Estadística, Facultad de Ciencias Económicas y Estadística, Universidad Nacional de Rosario, Rosario, Argentina
| | - D Wojdyla
- GLADEL consultant, Rosario, Argentina
| | - G J Pons-Estel
- Grupo Oroño, Centro Regional de Enfermedades Autoinmunes y Reumáticas (GO-CREAR), Rosario, Argentina
- Servicio de Reumatología, Hospital Provincial de Rosario, Rosario, Argentina
| | - R Quintana
- Grupo Oroño, Centro Regional de Enfermedades Autoinmunes y Reumáticas (GO-CREAR), Rosario, Argentina
- Servicio de Reumatología, Hospital Provincial de Rosario, Rosario, Argentina
| | - A Esposto
- Servicio de Infectología, Hospital Interzonal General de Agudos ‘General San Martín’, La Plata, Argentina
| | - M A García
- Servicio de Infectología, Hospital Interzonal General de Agudos ‘General San Martín’, La Plata, Argentina
| | - L J Catoggio
- Servicio de Reumatolgía, Hospital Italiano and Fundación ‘Dr. Pedro M. Catoggio para el Progreso de la Reumatología’, Buenos Aires, Argentina
| | - M H Cardiel
- Centro de Investigación Clínica de Morelia, Morelia, Michoacán, Mexico
| | - L A Barile
- Servicio de Reumatología, Hospital Ángeles del Pedregal, Ciudad de México, Mexico
| | - M -C Amigo
- Centro Médico ABC, Ciudad de México, Mexico
| | - E I Sato
- Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
| | - E Bonfa
- Rheumatology Division, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - E Borba
- Rheumatology Division, Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - L T Lavras Costallat
- Departamento de Clínica Médica, Faculdade de Ciências Medicas da UNICAMP, Universidade Estadual de Campinas, Campinas, Brazil
| | - O J Neira
- Sección de Reumatología, Hospital del Salvador, Universidad de Chile. Unidad de Reumatología, Clínica Alemana de Santiago, Facultad de Medicina Clínica Alemana, Universidad del Desarrollo, Santiago, Chile
| | - L Massardo
- Centro de Biología Celular y Biomedicina, Facultad de Medicina y Ciencia, Universidad San Sebastián, Santiago, Chile
| | | | - R Chacón-Díaz
- Servicio de Reumatología, Policlínica Méndez Gimón, Caracas, Venezuela
| | - G S Alarcón
- Division of Clinical Immunology and Rheumatology, Department of Medicine, School of Medicine, The University of Alabama at Birmingham, Birmingham, Alabama, USA
- Department of Medicine, School of Medicine, Universidad Peruana Cayetano Heredia, Lima, Peru
| | - B A Pons-Estel
- Grupo Oroño, Centro Regional de Enfermedades Autoinmunes y Reumáticas (GO-CREAR), Rosario, Argentina
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García L, Pena CE, Maldonado RÁ, Costi C, Mamberti M, Martins E, García MA. Increased renal damage in hypocomplementemic patients with ANCA-associated vasculitis: retrospective cohort study. Clin Rheumatol 2019; 38:2819-2824. [PMID: 31222573 DOI: 10.1007/s10067-019-04636-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Revised: 04/14/2019] [Accepted: 06/04/2019] [Indexed: 12/17/2022]
Abstract
INTRODUCTION The complement system has an important role in the pathogenesis of vasculitis associated with antineutrophilic cytoplasmic antibody (AAV) mainly at the level of the kidneys because patients with complement deposits on the glomerular basal membrane present more aggressive disease compared with those with pauci-immune vasculitis. AIM To analyze the association of hypocomplementemia with the clinical manifestations, laboratory data, renal histology, progress to renal insufficiency, and mortality of patients with AAV. METHODS Retrospective cohort study (2000-2007) included 93 patients with AAV. Hypocomplementemia is defined as having C3 values lower than 80 mg/dL or C4 values below 15 mg/dL. Demographic, statistical, clinical, hematological, serological, and histopathological characteristics of all the patients with and without diagnosis of hypocomplementemia were compared. In order to evaluate variable independence, a logistic regression analysis was used. RESULTS Ninety-three patients were studied of whom 63 (67.7%) had complement dosage at the moment of AAV diagnosis. Seven patients (11.1%) presented hypocomplementemia and a greater kidney involvement compared with normocomplementemic patients. Thirty renal biopsies were analyzed and 4 (13.3%) showed immunocomplex (IC) or complement deposits by an immunofluorescence test (IFT). Patients with "non-pauci-immune" AAV also presented terminal chronic renal disease (TCRD). CONCLUSION There is an association between low complement and the degree of renal damage in patients with AAV. Patients with renal biopsies confirming IC and/or complement deposits showed more aggressive renal disease. Key Points • The complement system has an important role in the pathogenesis of vasculitis associated to antineutrophilic cytoplasmic antibody. • The studies in murine models confirming the complement activation by alternative pathway and particularly the receptor C5a (C5aR) is necessary for the development of glomerulonefritis. • Complement deposit observed in the renal biopsies of patients diagnosed with AAV was correlated to greater kidney damage, greater proteinuria and major disease activity compared to patients diagnosed with typical pauci-immune vasculitis. • The presence of hypocomplementemia at the onset of the disease was also associated with a greater organ involvement, poor prognosis and greater mortality.
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Affiliation(s)
- L García
- Department of Rheumatology, Hospital San Martín de La Plata, La Plata, Buenos Aires, Argentina.
| | - C E Pena
- Department of Rheumatology, Hospital San Martín de La Plata, La Plata, Buenos Aires, Argentina
| | - R Águila Maldonado
- Department of Rheumatology, Hospital San Martín de La Plata, La Plata, Buenos Aires, Argentina
| | - C Costi
- Department of Rheumatology, Hospital San Martín de La Plata, La Plata, Buenos Aires, Argentina
| | - M Mamberti
- Department of Nephrology, Hospital San Martín de La Plata, La Plata, Argentina
| | - E Martins
- Institute of Development and Pediatric Research Profesor Dr. Fernando Viteri, La Plata, Argentina
| | - M A García
- Department of Rheumatology, Hospital San Martín de La Plata, La Plata, Buenos Aires, Argentina
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11
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Sarmiento ME, Alvarez N, Chin KL, Bigi F, Tirado Y, García MA, Anis FZ, Norazmi MN, Acosta A. Tuberculosis vaccine candidates based on mycobacterial cell envelope components. Tuberculosis (Edinb) 2019; 115:26-41. [PMID: 30948174 DOI: 10.1016/j.tube.2019.01.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 01/12/2019] [Accepted: 01/16/2019] [Indexed: 12/11/2022]
Abstract
Even after decades searching for a new and more effective vaccine against tuberculosis, the scientific community is still pursuing this goal due to the complexity of its causative agent, Mycobacterium tuberculosis (Mtb). Mtb is a microorganism with a robust variety of survival mechanisms that allow it to remain in the host for years. The structure and nature of the Mtb envelope play a leading role in its resistance and survival. Mtb has a perfect machinery that allows it to modulate the immune response in its favor and to adapt to the host's environmental conditions in order to remain alive until the moment to reactivate its normal growing state. Mtb cell envelope protein, carbohydrate and lipid components have been the subject of interest for developing new vaccines because most of them are responsible for the pathogenicity and virulence of the bacteria. Many indirect evidences, mainly derived from the use of monoclonal antibodies, support the potential protective role of Mtb envelope components. Subunit and DNA vaccines, lipid extracts, liposomes and membrane vesicle formulations are some examples of technologies used, with encouraging results, to evaluate the potential of these antigens in the protective response against Mtb.
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Affiliation(s)
- M E Sarmiento
- School of Health Sciences (PPSK), Universiti Sains Malaysia (USM), 16150 Kubang Kerian, Kelantan, Malaysia
| | - N Alvarez
- Rutgers New Jersey Medical School, Public Health Research Institute, Newark, NJ, USA
| | - K L Chin
- Department of Biomedical Sciences and Therapeutic, Faculty of Medicine and Health Sciences (FPSK), Universiti Malaysia Sabah (UMS), Sabah, Malaysia
| | - F Bigi
- Institute of Biotechnology, INTA, Buenos Aires, Argentina
| | - Y Tirado
- Finlay Institute of Vaccines, La Habana, Cuba
| | - M A García
- Finlay Institute of Vaccines, La Habana, Cuba
| | - F Z Anis
- School of Health Sciences (PPSK), Universiti Sains Malaysia (USM), 16150 Kubang Kerian, Kelantan, Malaysia
| | - M N Norazmi
- School of Health Sciences (PPSK), Universiti Sains Malaysia (USM), 16150 Kubang Kerian, Kelantan, Malaysia.
| | - A Acosta
- School of Health Sciences (PPSK), Universiti Sains Malaysia (USM), 16150 Kubang Kerian, Kelantan, Malaysia.
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12
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González-González A, Muñoz-Muela E, Marchal JA, Cara FE, Molina MP, Cruz-Lozano M, Jiménez G, Verma A, Ramírez A, Qian W, Chen W, Kozielski AJ, Elemento O, Martín-Salvago MD, Luque RJ, Rosa-Garrido C, Landeira D, Quintana-Romero M, Rosato RR, García MA, Ramirez-Tortosa CL, Kim H, Rodriguez-Aguayo C, Lopez-Berestein G, Sood AK, Lorente JA, Sánchez-Rovira P, Chang JC, Granados-Principal S. Activating Transcription Factor 4 Modulates TGFβ-Induced Aggressiveness in Triple-Negative Breast Cancer via SMAD2/3/4 and mTORC2 Signaling. Clin Cancer Res 2018; 24:5697-5709. [PMID: 30012564 DOI: 10.1158/1078-0432.ccr-17-3125] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 04/30/2018] [Accepted: 07/11/2018] [Indexed: 11/16/2022]
Abstract
Purpose: On the basis of the identified stress-independent cellular functions of activating transcription factor 4 (ATF4), we reported enhanced ATF4 levels in MCF10A cells treated with TGFβ1. ATF4 is overexpressed in patients with triple-negative breast cancer (TNBC), but its impact on patient survival and the underlying mechanisms remain unknown. We aimed to determine ATF4 effects on patients with breast cancer survival and TNBC aggressiveness, and the relationships between TGFβ and ATF4. Defining the signaling pathways may help us identify a cell signaling-tailored gene signature.Experimental Design: Patient survival data were determined by Kaplan-Meier analysis. Relationship between TGFβ and ATF4, their effects on aggressiveness (tumor proliferation, metastasis, and stemness), and the underlying pathways were analyzed in three TNBC cell lines and in vivo using patient-derived xenografts (PDX).Results: ATF4 overexpression correlated with TNBC patient survival decrease and a SMAD-dependent crosstalk between ATF4 and TGFβ was identified. ATF4 expression inhibition reduced migration, invasiveness, mammosphere-forming efficiency, proliferation, epithelial-mesenchymal transition, and antiapoptotic and stemness marker levels. In PDX models, ATF4 silencing decreased metastases, tumor growth, and relapse after chemotherapy. ATF4 was shown to be active downstream of SMAD2/3/4 and mTORC2, regulating TGFβ/SMAD and mTOR/RAC1-RHOA pathways independently of stress. We defined an eight-gene signature with prognostic potential, altered in 45% of 2,509 patients with breast cancer.Conclusions: ATF4 may represent a valuable prognostic biomarker and therapeutic target in patients with TNBC, and we identified a cell signaling pathway-based gene signature that may contribute to the development of combinatorial targeted therapies for breast cancer. Clin Cancer Res; 24(22); 5697-709. ©2018 AACR.
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Affiliation(s)
- Adrián González-González
- UGC de Oncología Médica, Complejo Hospitalario de Jaén, Jaén, Spain.,GENYO, Centre for Genomics and Oncological Research, Granada, Spain
| | - Esperanza Muñoz-Muela
- UGC de Oncología Médica, Complejo Hospitalario de Jaén, Jaén, Spain.,GENYO, Centre for Genomics and Oncological Research, Granada, Spain
| | - Juan A Marchal
- Instituto de Investigación Biosanitaria de Granada (ibs.GRANADA), Universidad de Granada, Granada, Spain.,Biopathology and Regenerative Medicine Institute (IBIMER), Centre for Biomedical Research (CIBM), University of Granada, Granada, Spain
| | - Francisca E Cara
- UGC de Oncología Médica, Complejo Hospitalario de Jaén, Jaén, Spain.,GENYO, Centre for Genomics and Oncological Research, Granada, Spain
| | - Maria P Molina
- UGC de Oncología Médica, Complejo Hospitalario de Jaén, Jaén, Spain.,GENYO, Centre for Genomics and Oncological Research, Granada, Spain
| | - Marina Cruz-Lozano
- UGC de Oncología Médica, Complejo Hospitalario de Jaén, Jaén, Spain.,GENYO, Centre for Genomics and Oncological Research, Granada, Spain
| | - Gema Jiménez
- Instituto de Investigación Biosanitaria de Granada (ibs.GRANADA), Universidad de Granada, Granada, Spain.,Biopathology and Regenerative Medicine Institute (IBIMER), Centre for Biomedical Research (CIBM), University of Granada, Granada, Spain
| | - Akanksha Verma
- Institute for Computational Biomedicine, Weill Cornell Medical College, New York, New York
| | - Alberto Ramírez
- Houston Methodist Cancer Center, Houston Methodist Hospital, Houston, Texas
| | - Wei Qian
- Institute for Computational Biomedicine, Weill Cornell Medical College, New York, New York
| | - Wen Chen
- Houston Methodist Cancer Center, Houston Methodist Hospital, Houston, Texas
| | | | - Olivier Elemento
- Institute for Computational Biomedicine, Weill Cornell Medical College, New York, New York
| | | | - Rafael J Luque
- UGC de Anatomía Patológica, Complejo Hospitalario de Jaén, Jaén, Spain
| | - Carmen Rosa-Garrido
- FIBAO. Complejo Hospitalario de Jaén, Servicio Andaluz de Salud, Jaén, Spain
| | - David Landeira
- GENYO, Centre for Genomics and Oncological Research, Granada, Spain.,Department of Biochemistry and Molecular Biology II, Faculty of Pharmacy, University of Granada, Granada, Spain
| | - María Quintana-Romero
- GENYO, Centre for Genomics and Oncological Research, Granada, Spain.,Department of Biochemistry and Molecular Biology II, Faculty of Pharmacy, University of Granada, Granada, Spain
| | - Roberto R Rosato
- Houston Methodist Cancer Center, Houston Methodist Hospital, Houston, Texas
| | - Maria A García
- Department of Oncology, Virgen de las Nieves University Hospital, Granada, Spain
| | | | - Hanna Kim
- Texas Tech University Health Sciences Center, School of Pharmacy, Amarillo, Texas
| | - Cristian Rodriguez-Aguayo
- Center for RNA Interference and Non-Coding RNA, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Gabriel Lopez-Berestein
- Center for RNA Interference and Non-Coding RNA, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Anil K Sood
- Center for RNA Interference and Non-Coding RNA, The University of Texas MD Anderson Cancer Center, Houston, Texas
| | - Jose A Lorente
- GENYO, Centre for Genomics and Oncological Research, Granada, Spain
| | - Pedro Sánchez-Rovira
- UGC de Oncología Médica, Complejo Hospitalario de Jaén, Jaén, Spain.,GENYO, Centre for Genomics and Oncological Research, Granada, Spain
| | - Jenny C Chang
- Houston Methodist Cancer Center, Houston Methodist Hospital, Houston, Texas
| | - Sergio Granados-Principal
- UGC de Oncología Médica, Complejo Hospitalario de Jaén, Jaén, Spain. .,GENYO, Centre for Genomics and Oncological Research, Granada, Spain.,FIBAO. Complejo Hospitalario de Jaén, Servicio Andaluz de Salud, Jaén, Spain
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13
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Lopez-Dominguez V, Quesada A, Guzmán-Mínguez JC, Moreno L, Lere M, Spottorno J, Giacomone F, Fernández JF, Hernando A, García MA. A simple vibrating sample magnetometer for macroscopic samples. Rev Sci Instrum 2018; 89:034707. [PMID: 29604780 DOI: 10.1063/1.5017708] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We here present a simple model of a vibrating sample magnetometer (VSM). The system allows recording magnetization curves at room temperature with a resolution of the order of 0.01 emu and is appropriated for macroscopic samples. The setup can be mounted with different configurations depending on the requirements of the sample to be measured (mass, saturation magnetization, saturation field, etc.). We also include here examples of curves obtained with our setup and comparison curves measured with a standard commercial VSM that confirms the reliability of our device.
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Affiliation(s)
- V Lopez-Dominguez
- Instituto de Cerámica y Vidrio-Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - A Quesada
- Instituto de Cerámica y Vidrio-Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - J C Guzmán-Mínguez
- Instituto de Cerámica y Vidrio-Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - L Moreno
- Instituto de Cerámica y Vidrio-Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - M Lere
- Instituto de Investigación en Ciencia y Tecnología de Materiales, CONICET, Mar del Plata, Buenos Aires, Argentina
| | - J Spottorno
- Instituto de Magnetismo Aplicado-UCM-ADIF, Unidad Asociada CSIC, Madrid, Spain
| | - F Giacomone
- Instituto de Magnetismo Aplicado-UCM-ADIF, Unidad Asociada CSIC, Madrid, Spain
| | - J F Fernández
- Instituto de Cerámica y Vidrio-Consejo Superior de Investigaciones Científicas, Madrid, Spain
| | - A Hernando
- Instituto de Magnetismo Aplicado-UCM-ADIF, Unidad Asociada CSIC, Madrid, Spain
| | - M A García
- Instituto de Cerámica y Vidrio-Consejo Superior de Investigaciones Científicas, Madrid, Spain
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14
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Ugarte-Gil MF, Wojdyla D, Pastor-Asurza CA, Gamboa-Cárdenas RV, Acevedo-Vásquez EM, Catoggio LJ, García MA, Bonfá E, Sato EI, Massardo L, Pascual-Ramos V, Barile LA, Reyes-Llerena G, Iglesias-Gamarra A, Molina-Restrepo JF, Chacón-Díaz R, Alarcón GS, Pons-Estel BA. Predictive factors of flares in systemic lupus erythematosus patients: data from a multiethnic Latin American cohort. Lupus 2017; 27:536-544. [PMID: 28857715 DOI: 10.1177/0961203317728810] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Purpose The purpose of this paper is to determine the factors predictive of flares in systemic lupus erythematosus (SLE) patients. Methods A case-control study nested within the Grupo Latino Americano De Estudio de Lupus (GLADEL) cohort was conducted. Flare was defined as an increase ≥4 points in the SLEDAI. Cases were defined as patients with at least one flare. Controls were selected by matching cases by length of follow-up. Demographic and clinical manifestations were systematically recorded by a common protocol. Glucocorticoid use was recorded as average daily dose of prednisone and antimalarial use as percentage of time on antimalarial and categorized as never (0%), rarely (>0-25%), occasionally (>25%-50%), commonly (˃50%-75%) and frequently (˃75%). Immunosuppressive drugs were recorded as used or not used. The association between demographic, clinical manifestations, therapy and flares was examined using univariable and multivariable conditional logistic regression models. Results A total of 465 cases and controls were included. Mean age at diagnosis among cases and controls was 27.5 vs 29.9 years, p = 0.003; gender and ethnic distributions were comparable among both groups and so was the baseline SLEDAI. Independent factors protective of flares identified by multivariable analysis were older age at diagnosis (OR = 0.929 per every five years, 95% CI 0.869-0.975; p = 0.004) and antimalarial use (frequently vs never, OR = 0.722, 95% CI 0.522-0.998; p = 0.049) whereas azathioprine use (OR = 1.820, 95% CI 1.309-2.531; p < 0.001) and SLEDAI post-baseline were predictive of them (OR = 1.034, 95% CI 1.005-1.064; p = 0.022). Conclusions In this large, longitudinal Latin American cohort, older age at diagnosis and more frequent antimalarial use were protective whereas azathioprine use and higher disease activity were predictive of flares.
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Affiliation(s)
- M F Ugarte-Gil
- 1 Hospital Guillermo Almenara Irigoyen, EsSalud, Lima, Perú.,2 Universidad Científica del Sur, Lima, Perú
| | - D Wojdyla
- 3 Universidad Nacional de Rosario, Rosario, Argentina
| | - C A Pastor-Asurza
- 1 Hospital Guillermo Almenara Irigoyen, EsSalud, Lima, Perú.,4 Universidad Nacional Mayor de San Marcos, Lima, Perú
| | | | - E M Acevedo-Vásquez
- 1 Hospital Guillermo Almenara Irigoyen, EsSalud, Lima, Perú.,4 Universidad Nacional Mayor de San Marcos, Lima, Perú
| | - L J Catoggio
- 5 Sección de Reumatología, Servicio de Clínica Médica, Hospital Italiano, Instituto Universitario Escuela de Medicina Hospital Italiano and Fundación Dr. Pedro M. Catoggio para el Progreso de la Reumatología, Buenos Aires, Argentina
| | - M A García
- 6 Hospital Interzonal General de Agudos "General San Martín," La Plata, Argentina
| | - E Bonfá
- 7 Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil
| | - E I Sato
- 8 Disciplina de Reumatología, Escola Paulista de Medicina, Universidade Federal da São Paulo-UNIFESP, São Paulo, Brazil
| | - L Massardo
- 9 Escuela de Medicina, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - V Pascual-Ramos
- 10 Instituto Nacional de Ciencias Médicas y Nutrición "Salvador Zubirán," Ciudad de Mexico, Mexico
| | - L A Barile
- 11 Hospital de Especialidades Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Ciudad de Mexico, Mexico
| | - G Reyes-Llerena
- 12 Centro de Investigaciones Médico Quirúrgicas-CIMEQ, Habana, Cuba
| | | | | | - R Chacón-Díaz
- 15 Servicio de Reumatología, Centro Nacional de Enfermedades Reumáticas, Hospital Universitario de Caracas, Caracas, Venezuela
| | - G S Alarcón
- 16 Department of Medicine, Division of Clinical Immunology and Rheumatology, School of Medicine, The University of Alabama at Birmingham, Birmingham, AL, USA
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15
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Lopez-Dominguez V, de la Presa P, Hernando A, García MA. Note: On the study of metal/oxide hybrid ferromagnets with magneto-optical techniques. Rev Sci Instrum 2017; 88:086102. [PMID: 28863633 DOI: 10.1063/1.4996779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We analyze here the magneto-optical measurements of hybrid materials containing metallic and oxide ferromagnetic phases. We show that the magnetization curves obtained with this technique can be fairly different to those obtained with standard magnetometry techniques and cannot be representative of the contribution of each phase to the magnetization of the material, due to the very different optical properties of metals and oxides. However, a proper numerical analysis of the magneto-optical measurements allows estimating the fraction of each phase present in the material.
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Affiliation(s)
| | - P de la Presa
- Instituto de Magnetismo Aplicado UCM-ADIF-CSIC, Madrid, Spain
| | - A Hernando
- Instituto de Magnetismo Aplicado UCM-ADIF-CSIC, Madrid, Spain
| | - M A García
- Instituto de Cerámica y Vidrio, CSIC, Madrid, Spain
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16
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Serrano MJ, Ortega FG, Alvarez-Cubero MJ, Nadal R, Sanchez-Rovira P, Salido M, Rodríguez M, García-Puche JL, Delgado-Rodriguez M, Solé F, García MA, Perán M, Rosell R, Marchal JA, Lorente JA. EMT and EGFR in CTCs cytokeratin negative non-metastatic breast cancer. Oncotarget 2015; 5:7486-97. [PMID: 25277187 PMCID: PMC4202138 DOI: 10.18632/oncotarget.2217] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Circulating tumor cells (CTCs) are frequently associated with epithelialmesenchymal transition (EMT). The objective of this study was to detect EMT phenotype through Vimentin (VIM) and Slug expression in cytokeratin (CK)-negative CTCs in non-metastatic breast cancer patients and to determine the importance of EGFR in the EMT phenomenon. In CK-negative CTCs samples, both VIM and Slug markers were co-expressed in the most of patients. Among patients EGFR+, half of them were positive for these EMT markers. Furthermore, after a systemic treatment 68% of patients switched from CK- to CK+ CTCs. In our experimental model we found that activation of EGFR signaling by its ligand on MCF-7 cells is sufficient to increase EMT phenotypes, to inhibit apoptotic events and to induce the loss of CK expression. The simultaneous detection of both EGFR and EMT markers in CTCs may improve prognostic or predictive information in patients with operable breast cancer.
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Affiliation(s)
- Maria J Serrano
- GENYO. Pfizer-University of Granada-Andalusian Government Centre of Genomics and Oncology, Granada, Spain. Laboratory of Genetic Identification-UGR, Department of Legal Medicine, University of Granada, Granada, Spain. Contributed equally to this work
| | - Francisco G Ortega
- GENYO. Pfizer-University of Granada-Andalusian Government Centre of Genomics and Oncology, Granada, Spain. Contributed equally to this work
| | - Maria J Alvarez-Cubero
- GENYO. Pfizer-University of Granada-Andalusian Government Centre of Genomics and Oncology, Granada, Spain. Laboratory of Genetic Identification-UGR, Department of Legal Medicine, University of Granada, Granada, Spain
| | - Rosa Nadal
- Hospital de Barcelona, Medical Oncology Department, Barcelona, Spain
| | - Pedro Sanchez-Rovira
- University of Jaén, Division of Preventive Medicine and Public Health, CIBERESP, Jaén, Spain
| | - Marta Salido
- Molecular Cytogenetics Laboratory; Pathology Department, Parc de Salut Mar-Hospital del Mar-IMIM-GRETNHE, Barcelona, Spain
| | - María Rodríguez
- Molecular Cytogenetics Laboratory; Pathology Department, Parc de Salut Mar-Hospital del Mar-IMIM-GRETNHE, Barcelona, Spain
| | - Jose L García-Puche
- GENYO. Pfizer-University of Granada-Andalusian Government Centre of Genomics and Oncology, Granada, Spain
| | | | - Francisco Solé
- Medicine Department. Universitat Autònoma de Barcelona, Barcelona, Spain. Institut de Recerca contra la Leucèmia Josep Carreras, Badalona, Spain
| | - Maria A García
- Department of Oncology, Virgen de las Nieves, University Hospital, Granada, Spain
| | - Macarena Perán
- University of Jaén, Division of Preventive Medicine and Public Health, CIBERESP, Jaén, Spain. Biopathology and Regenerative Medicine Institute (IBIMER), Centre for Biomedical Research, University of Granada, Granada, Spain
| | - Rafael Rosell
- Catalan Institute of Oncology, Hospital Germans Trias i Pujol, Badalona, Spain (RR); Pangaea Biotech SL, USP Dexeus University Institute, Barcelona, Spain (RR, MAM)
| | - Juan A Marchal
- Biopathology and Regenerative Medicine Institute (IBIMER), Centre for Biomedical Research, University of Granada, Granada, Spain. Department of Human Anatomy and Embryology, University of Granada, Granada, Spain
| | - Jose A Lorente
- GENYO. Pfizer-University of Granada-Andalusian Government Centre of Genomics and Oncology, Granada, Spain. Laboratory of Genetic Identification-UGR, Department of Legal Medicine, University of Granada, Granada, Spain
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17
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García MA, Alonso J, Melgar MJ. Radiocaesium activity concentrations in macrofungi from Galicia (NW Spain): Influence of environmental and genetic factors. Ecotoxicol Environ Saf 2015; 115:152-158. [PMID: 25700093 DOI: 10.1016/j.ecoenv.2015.02.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2014] [Revised: 01/30/2015] [Accepted: 02/04/2015] [Indexed: 06/04/2023]
Abstract
Radiocaesium ((137)Cs) is an artificial radionuclide that can be captured from the soil through the mycelium of fungi. However, in Spain there are few data on its presence in edible mushrooms. (137)Cs activity concentrations were determined using 54 samples of wild and cultivated mushrooms and 18 samples of soil, all of them collected in Galicia (NW Spain) during 2010. Samples were analyzed by gamma spectroscopy with a High-Purity Germanium (HPGe) detector. The average activity concentration of (137)Cs in wild mushrooms was 249.2Bqkg(-1) dry weight (dw) and about 24.9Bqkg(-1) fresh weight (fw). Genetic factors (species) influenced the uptake of (137)Cs, highlighting Hydnum repandum as the greatest accumulator of all wild species (1016.4Bqkg(-1) dw), while cultivated species showed much lower levels (1.6Bqkg(-1) fw). Accumulation was also favored by fungal mycorrhizal ecology, whose mycelium was distributed in contaminated soil horizons. The mean levels detected in soils were 14Bqkg(-1) fw. Although some species behaved as bioexclusors of radiocaesium, the transfer factors (TF) suggest that mushrooms preferentially bioaccumulate (137)Cs. No sample reached the limit of 600Bqkg(-1) fw (about 6000Bqkg(-1) dw) indicated in the European legislation. In conclusion, the consumption of mushrooms harvested from the investigated areas poses no toxicological risk to human health due to radiocaesium.
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Affiliation(s)
- M A García
- Department of Toxicology, Faculty of Veterinary Science. University of Santiago de Compostela, 27002 Lugo, Spain
| | - J Alonso
- Department of Toxicology, Faculty of Veterinary Science. University of Santiago de Compostela, 27002 Lugo, Spain; Centro Tecnológico Agroalimentario de Lugo (CETAL), 27002 Lugo, Spain
| | - M J Melgar
- Department of Toxicology, Faculty of Veterinary Science. University of Santiago de Compostela, 27002 Lugo, Spain.
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18
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de la Cruz-Herrera CF, Campagna M, García MA, Marcos-Villar L, Lang V, Baz-Martínez M, Gutiérrez S, Vidal A, Rodríguez MS, Esteban M, Rivas C. Activation of the double-stranded RNA-dependent protein kinase PKR by small ubiquitin-like modifier (SUMO). J Biol Chem 2014; 289:26357-26367. [PMID: 25074923 PMCID: PMC4176227 DOI: 10.1074/jbc.m114.560961] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 07/11/2014] [Indexed: 01/07/2023] Open
Abstract
The dsRNA-dependent kinase PKR is an interferon-inducible protein with ability to phosphorylate the α subunit of the eukaryotic initiation factor (eIF)-2 complex, resulting in a shut-off of general translation, induction of apoptosis, and inhibition of virus replication. Here we analyzed the modification of PKR by the small ubiquitin-like modifiers SUMO1 and SUMO2 and evaluated the consequences of PKR SUMOylation. Our results indicate that PKR is modified by both SUMO1 and SUMO2, in vitro and in vivo. We identified lysine residues Lys-60, Lys-150, and Lys-440 as SUMOylation sites in PKR. We show that SUMO is required for efficient PKR-dsRNA binding, PKR dimerization, and eIF2α phosphorylation. Furthermore, we demonstrate that SUMO potentiates the inhibition of protein synthesis induced by PKR in response to dsRNA, whereas a PKR SUMOylation mutant is impaired in its ability to inhibit protein synthesis and shows reduced capability to control vesicular stomatitis virus replication and to induce apoptosis in response to vesicular stomatitis virus infection. In summary, our data demonstrate the important role of SUMO in processes mediated by the activation of PKR.
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Affiliation(s)
- Carlos F de la Cruz-Herrera
- Departamento de Biología Molecular y Celular, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CSIC), Darwin 3, Madrid 28049
| | - Michela Campagna
- Departamento de Biología Molecular y Celular, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CSIC), Darwin 3, Madrid 28049
| | - Maria A García
- Unidad de Investigación, Hospital Universitario Virgen de las Nieves, 18014 Granada
| | - Laura Marcos-Villar
- Departamento de Biología Molecular y Celular, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CSIC), Darwin 3, Madrid 28049
| | - Valerie Lang
- Ubiquitylation and Cancer Molecular Biology Laboratory, Inbiomed, San Sebastian-Donostia, 20009 Gipuzkoa, Spain
| | - Maite Baz-Martínez
- Centro de Investigación en Medicina Molecular (CIMUS), Universidade de Santiago de Compostela, Instituto de Investigaciones Sanitarias (IDIS), Santiago de Compostela E15782
| | - Sylvia Gutiérrez
- Confocal Service of Centro Nacional de Biotecnología-CSIC, Darwin 3, Madrid 28049, and
| | - Anxo Vidal
- Departamento de Fisioloxía and Centro de Investigación en Medicina Molecular (CIMUS), Universidade de Santiago de Compostela, Instituto de Investigaciones Sanitarias (IDIS), Santiago de Compostela E15782, Spain
| | - Manuel S Rodríguez
- Ubiquitylation and Cancer Molecular Biology Laboratory, Inbiomed, San Sebastian-Donostia, 20009 Gipuzkoa, Spain
| | - Mariano Esteban
- Departamento de Biología Molecular y Celular, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CSIC), Darwin 3, Madrid 28049
| | - Carmen Rivas
- Departamento de Biología Molecular y Celular, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CSIC), Darwin 3, Madrid 28049,; Centro de Investigación en Medicina Molecular (CIMUS), Universidade de Santiago de Compostela, Instituto de Investigaciones Sanitarias (IDIS), Santiago de Compostela E15782,.
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García-Rubiño ME, Conejo-García A, Núñez MC, Carrasco E, García MA, Choquesillo-Lazarte D, García-Ruiz JM, Gallo MA, Marchal JA, Campos JM. Enantiospecific synthesis of heterocycles linked to purines: different apoptosis modulation of enantiomers in breast cancer cells. Curr Med Chem 2014; 20:4924-34. [PMID: 24059234 DOI: 10.2174/09298673113206660263] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2013] [Revised: 06/17/2013] [Accepted: 09/10/2013] [Indexed: 11/22/2022]
Abstract
The issue of chiral drug is now a major theme in the design, discovery and development of new drugs. It has been shown for many pharmaceuticals that only one enantiomer contains the desired activity, and the synthesis of such drug molecules in their optically pure form is becoming increasingly important. Mitsunobu reaction was carried out between (R)- and (S)-3,4-dihydro-2H-1,5-benzoxathiepin-3-ol and purines under microwave irradiation. A contraction into a six-membered ring takes place with concomitant inversion at the stereocentre with excellent enatiomeric excesses giving rise to the homochiral 9-(2,3-dihydro-1,4-benzoxathiin-3-ylmethyl)-9H-purines. The anti-tumour activity of all enantiomers is reported against the caspase-3-deficient MCF-7 and the wild type SKBR-3 human breast cancer cells. The most active homochiral compound displays an IC50 of 1.85 μM and induces inhibition of the translation initiation factor eIF2α. All homochiral compounds included in this study show different apoptotic effects between both enantiomers with levels up to 99%. We have analyzed caspase-mediated apoptotic pathways on enantiomers and racemates. We have found a homochiral derivative that activates the canonical intrinsic caspase-8/caspase-3 apoptotic pathway on the MCF-7 cells, and a racemic compound that induces caspase-2 activation. Moreover, we demonstrate the involvement of caspase activation during cell death induced by these compounds in SKBR-3 cells.
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Affiliation(s)
- M E García-Rubiño
- Departamento de Química Farmacéutica y Orgánica, Facultad de Farmacia, c/ Campus de Cartuja, s/n, 18071 Granada, Spain.
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Prieto E, Pérez S, Pablo LE, García MA, Bregante MA. Vitreous pharmacokinetics and bioavailability of memantine after subtenon, intravenous, and intravitreal administration in rabbits. J Ocul Pharmacol Ther 2014; 30:392-9. [PMID: 24597794 DOI: 10.1089/jop.2013.0193] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
PURPOSE This study evaluated the vitreous pharmacokinetics and vitreous bioavailability of memantine following posterior-subtenon administration (PST) compared to intravitreal (INT) and intravenous routes (INV) in rabbits. METHODS Vitreous pharmacokinetic analysis was performed on female New Zealand (NZ) albino rabbits after PST, INT, and INV administration and calculating the pharmacokinetic parameters that describe memantine vitreous distribution. The vitreous bioavailability (F) and the relative vitreous bioavailability of memantine was estimated after posterior-subtenon administration (Frel (pst/int)) and after intravenous route (Frel (inv/int)) compared with intravitreal administration. Relative vitreous bioavailability of memantine was also estimated following PST administration compared with vitreous concentrations after intravenous administration (Frel (pst/inv)). RESULTS Memantine kinetics in the vitreous of NZ albino rabbits after PST administration can be explained by a one-compartment model, which was characterized by a fast absorption process, and a short terminal half-life. Vitreous pharmacokinetics following INV administration was also characterized by a fast absorption process, a terminal half-life significantly longer than the subtenon route, and low area under the curve values. High vitreous bioavailability after PST was observed, and the relative vitreous bioavailability of memantine following PST administration (0.53%) was greater than for intravenous administration (0.02%). CONCLUSIONS Our results suggest that memantine reaches the vitreous after PST administration by local diffusion. These data also show that local diffusion of the drug is responsible for greater vitreous availability of memantine following PST administration compared with INV administration.
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Affiliation(s)
- Esther Prieto
- 1 Department of Ophthalmology, Miguel Servet University Hospital and Aragon Health Sciences Institute (I+CS), University of Zaragoza , Zaragoza, Spain
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Muñoz Noval A, García R, Ruiz Casas D, Losada Bayo D, Sánchez Vaquero V, Torres Costa V, Martín Palma RJ, García MA, García Ruiz JP, Serrano Olmedo JJ, Muñoz Negrete JF, del Pozo Guerrero F, Manso Silván M. Design and characterization of biofunctional magnetic porous silicon flakes. Acta Biomater 2013; 9:6169-76. [PMID: 23237987 DOI: 10.1016/j.actbio.2012.12.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2012] [Revised: 10/12/2012] [Accepted: 12/05/2012] [Indexed: 11/27/2022]
Abstract
Magnetic porous silicon flakes (MPSF) were obtained from mesoporous silicon layers formed by multi-step anodization and subsequent composite formation with Fe oxide nanoparticles by thermal annealing. The magnetic nanoparticles adhered to the surface and penetrated inside the pores. Their structure evolved as a result of the annealing treatments derived from X-ray diffraction and X-ray absorption analyses. Moreover, by tailoring the magnetic load, the dynamic and hydrodynamic properties of the particles were controlled, as observed by the pressure displayed against a sensor probe. Preliminary functionality experiments were performed using an eye model, seeking potential use of MPSF as reinforcement for restored detached retina. It was observed that optimal flake immobilization is obtained when the MPSF reach values of magnetic saturation >10(-4)Am(2)g(-1). Furthermore, the MPSF were demonstrated to be preliminarily biocompatible in vitro. Moreover, New Zealand rabbit in vivo models demonstrated their short-term histocompatibility and their magnetic functionality as retina pressure actuators.
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Affiliation(s)
- A Muñoz Noval
- Departamento de Física Aplicada, Universidad Autónoma de Madrid, Madrid, Spain.
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Serrano A, Rodríguez de la Fuente O, Collado V, Rubio-Zuazo J, Monton C, Castro GR, García MA. Simultaneous surface plasmon resonance and x-ray absorption spectroscopy. Rev Sci Instrum 2012; 83:083101. [PMID: 22938268 DOI: 10.1063/1.4739773] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We present an experimental setup for the simultaneous measurement of surface plasmon resonance (SPR) and x-ray absorption spectroscopy (XAS) on metallic thin films at a synchrotron beamline. The system allows measuring in situ and in real time the effect of x-ray irradiation on the SPR curves to explore the interaction of x-rays with matter. It is also possible to record XAS spectra while exciting SPR in order to study changes in the films induced by the excitation of surface plasmons. Combined experiments recording simultaneously SPR and XAS curves while scanning different parameters can be also carried out. The relative variations in the SPR and XAS spectra that can be detected with this setup range from 10(-3) to 10(-5), depending on the particular experiment.
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Affiliation(s)
- A Serrano
- Instituto de Cerámica y Vidrio (ICV-CSIC), Cantoblanco, 28049 Madrid, Spain.
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Rivero S, García MA, Pinotti A. Heat treatment to modify the structural and physical properties of chitosan-based films. J Agric Food Chem 2012; 60:492-499. [PMID: 22148436 DOI: 10.1021/jf204077k] [Citation(s) in RCA: 37] [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] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This work was focused on studying the changes undergone by heat-treated chitosan films with and without tannic acid addition by monitoring both microstructure and physical properties. Once the films were submitted to different heat treatments, they exhibited higher barrier properties as well as lower water uptake, solubility, and moisture content. These results were also confirmed through X-ray patterns, which changed from the hydrated to the anhydrous conformation, sharper FTIR peaks specifically associated with water, and shift of T(g) toward higher temperatures determined by DMA. Moreover, the modifications caused by the curing process at a molecular scale were observed at a structural level by using a TEM technique. FTIR evaluation granted new insights into the interactions between tannic acid and chitosan molecules, before and after the heat curing, especially due to the occurrence of new peaks and changes in the wavenumber region 1550-1750 cm(-1).
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Affiliation(s)
- Sandra Rivero
- Facultad de Ciencias Exactas, Centro de Investigación y Desarrollo en Criotecnología de Alimentos, CONICET La Plata, UNLP, 47 y 116, La Plata 1900, Argentina
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Koo M, Sabaté A, Magalló P, García MA, Domínguez J, de Lama ME, López S. [Multidisciplinary protocol for computed tomography imaging and angiographic embolization of splenic injury due to trauma: assessment of pre-protocol and post-protocol outcomes]. Rev Esp Anestesiol Reanim 2011; 58:538-542. [PMID: 22279872 DOI: 10.1016/s0034-9356(11)70137-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
OBJECTIVES To assess conservative treatment of splenic injury due to trauma, following a protocol for computed tomography (CT) and angiographic embolization. To quantify the predictive value of CT for detecting bleeding and need for embolization. MATERIAL AND METHODS The care protocol developed by the multidisciplinary team consisted of angiography with embolization of lesions revealed by contrast extravasation under CT as well as embolization of grade III-V injuries observed, or grade I-II injuries causing hemodynamic instability and/or need for blood transfusion. We collected data on demographic variables, injury severity score (ISS), angiographic findings, and injuries revealed by CT. Pre-protocol and post-protocol outcomes were compared. The sensitivity and specificity of CT findings were calculated for all patients who required angiographic embolization. RESULTS Forty-four and 30 angiographies were performed in the pre- and post-protocol periods, respectively. The mean (SD) ISSs in the two periods were 25 (11) and 26 (12), respectively. A total of 24 (54%) embolizations were performed in the pre-protocol period and 28 (98%) after implementation of the protocol. Two and 7 embolizations involved the spleen in the 2 periods, respectively; abdominal laparotomies numbered 32 and 25, respectively, and 10 (31%) vs 4 (16%) splenectomies were performed. The specificity and sensitivity values for contrast extravasation found on CT and followed by embolization were 77.7% and 79.5%. CONCLUSIONS The implementation of this multidisciplinary protocol using CT imaging and angiographic embolization led to a decrease in the number of splenectomies. The protocol allows us to take a more conservative treatment approach.
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Affiliation(s)
- M Koo
- Servicio de Anestesiología y Reanimación, Hospital Universitari de Bellvitge, Idibell, Barcelona.
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Cifuentes M, García MA, Arrabal PM, Martínez F, Yañez MJ, Jara N, Weil B, Domínguez D, Medina RA, Nualart F. Insulin regulates GLUT1-mediated glucose transport in MG-63 human osteosarcoma cells. J Cell Physiol 2011; 226:1425-32. [PMID: 21321933 DOI: 10.1002/jcp.22668] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Osteosarcoma is the most common type of malignant bone cancer, accounting for 35% of primary bone malignancies. Because cancer cells utilize glucose as their primary energy substrate, the expression and regulation of glucose transporters (GLUT) may be important in tumor development and progression. GLUT expression has not been studied previously in human osteosarcoma cell lines. Furthermore, although insulin and insulin-like growth factor (IGF-I) play an important role in cell proliferation and tumor progression, the role of these hormones on GLUT expression and glucose uptake, and their possible relation to osteosarcoma, have also not been studied. We determined the effect of insulin and IGF-I on GLUT expression and glucose transport in three well-characterized human osteosarcoma cell lines (MG-63, SaOs-2, and U2-Os) using immunocytochemical, RT-PCR and functional kinetic analyses. Furthermore we also studied GLUT isoform expression in osteosarcoma primary tumors and metastases by in situ hybridization and immunohistochemical analyses. RT-PCR and immunostaining show that GLUT1 is the main isoform expressed in the cell lines and tissues studied, respectively. Immunocytochemical analysis shows that although insulin does not affect levels of GLUT1 expression it does induce a translocation of the transporter to the plasma membrane. This translocation is associated with increased transport of glucose into the cell. GLUT1 is the main glucose transporter expressed in osteosarcoma, furthermore, this transporter is regulated by insulin in human MG-63 cells. One possible mechanism through which insulin is involved in cancer progression is by increasing the amount of glucose available to the cancer cell.
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Affiliation(s)
- Manuel Cifuentes
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), Departamento de Biología Celular, Genética y Fisiología, Universidad de Málaga, Málaga, España
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Gómez-Benito M, Conchillo A, García MA, Vázquez I, Maicas M, Vicente C, Cristobal I, Marcotegui N, García-Ortí L, Bandrés E, Calasanz MJ, Alonso MM, Odero MD. EVI1 controls proliferation in acute myeloid leukaemia through modulation of miR-1-2. Br J Cancer 2010; 103:1292-6. [PMID: 20842122 PMCID: PMC2967053 DOI: 10.1038/sj.bjc.6605874] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Bakground: The EVI1(ecotropic virus integration site 1) gene codes for a zinc-finger transcription factor, whose transcriptional activation leads to a particularly aggressive form of acute myeloid leukaemia (AML). Although, EVI1 interactions with key proteins in hematopoiesis have been previously described, the precise role of this transcription factor in promoting leukaemic transformation is not completely understood. Recent works have identified specific microRNA (miRNA) signatures in different AML subgroups. However, there is no analysis of miRNAs profiles associated with EVI1 overexpression in humans. Methods: We performed QT-RT–PCR to assess the expression of 250 miRNAs in cell lines with or without EVI1 overexpression and in patient samples. We used ChIP assays to evaluated the possible binding of EVI1 binding to the putative miRNA promoter. Proliferation of the different cell lines transfected with the anti- or pre-miRs was quantified by MTT. Results: Our data showed that EVI1 expression was significantly correlated with the expression of miR-1-2 and miR-133-a-1 in established cell lines and in patient samples. ChIP assays confirmed that EVI1 binds directly to the promoter of these two miRNAs. However, only miR-1-2 was involved in abnormal proliferation in EVI1 expressing cell lines. Conclusions: Our data showed that EVI1 controls proliferation in AML through modulation of miR-1-2. This study contributes to further understand the transcriptional networks involving transcription factors and miRNAs in AML.
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Affiliation(s)
- M Gómez-Benito
- Division of Oncology, Center for Applied Medical Research, University of Navarra, Navarra, Pamplona 31008, Spain
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Pons-Estel BA, Sánchez-Guerrero J, Romero-Díaz J, Iglesias-Gamarra A, Bonfa E, Borba EF, Shinjo SK, Bernatsky S, Clarke A, García MA, Marcos JC, Duarte A, Berbotto GA, Scherbarth H, Marques CD, Onetti L, Saurit V, Souza AWS, Velozo E, Catoggio LJ, Neira O, Burgos PI, Ramirez LA, Molina JF, De La Torre IG, Silvariño R, Manni JA, Durán-Barragán S, Vilá LM, Fortin PR, Calvo-Alén J, Santos MJ, Portela M, Esteva-Spinetti MH, Weisman M, Acevedo EM, Segami MI, Gentiletti SB, Roldán J, Navarro I, Gonzalez E, Liu JM, Karlson EW, Costenbader KH, Wolfe F, Alarcón GS. Validation of the Spanish, Portuguese and French versions of the Lupus Damage Index questionnaire: data from North and South America, Spain and Portugal. Lupus 2010; 18:1033-52. [PMID: 19762375 DOI: 10.1177/0961203309105590] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
We have previously developed and validated a self-administered questionnaire, modelled after the Systemic Lupus International Collaborating Clinics Damage Index (SDI), the Lupus Damage Index Questionnaire (LDIQ), which may allow the ascertainment of this construct in systemic lupus erythematosus (SLE) patients followed in the community and thus expand observations made about damage. We have now translated, back-translated and adapted the LDIQ to Spanish, Portuguese and French and applied it to patients followed at academic and non-academic centres in North and South America, Portugal and Spain while their physicians scored the SDI. A total of 887 patients (659 Spanish-speaking, 140 Portuguese-speaking and 80 French-speaking patients) and 40 physicians participated. Overall, patients scored all LDIQ versions higher than their physicians (total score and all domains). Infrequent manifestations had less optimal clinimetric properties but overall agreement was more than 95% for the majority of items. Higher correlations were observed among the Spanish-speaking patients than the Portuguese-speaking and French-speaking patients; further adjustments may be needed before the Portuguese and French versions of the LDIQ are applied in community-based studies. The relationship between the LDIQ and other outcome parameters is currently being investigated in a different patient sample.
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Affiliation(s)
- B A Pons-Estel
- Grupo Latíno Americano de Estudio de Lupus or Latin America Group for the Study of Lupus, Rosario, Argentina
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Bellomio V, Spindler A, Lucero E, Berman A, Sueldo R, Berman H, Santana M, Molina MJ, Góngora V, Cassano G, Paira S, Saurit V, Retamozo S, Retamozo G, Alvarellos A, Caerio F, Alba P, Gotero M, Velozo EJ, Ceballos F, Soriano E, Catoggio L, García MA, Eimon A, Agüero S. Metabolic syndrome in Argentinean patients with systemic lupus erythematosus. Lupus 2010; 18:1019-25. [PMID: 19762406 DOI: 10.1177/0961203309105876] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The objective was to determine the prevalence of the metabolic syndrome (MS) in patients with systemic lupus erythematosus (SLE) in Argentina, to assess the factors associated to it, and to compare the results with a control group with non-inflammatory disorders. The study included 147 patients with SLE and 119 controls. MS was defined according to criteria by the American Heart Association/National Heart, Lung, and Blood Institute (AHA/NHLBI) Scientific Statement. Demographic characteristics, Systemic Lupus Erythematosus Disease Activity Index (SLEDAI) and Systemic Lupus International Collaborating Clinics/ACR Damage Index (SDI) were assessed as well as administration, maximum dose and cumulative dose of prednisone and hydroxychloroquine (HCQ). MS prevalence was 28.6% (CI 95%: 21.4-36.6) in patients with SLE and 16% in controls (P = 0.0019). Patients with SLE presented higher arterial hypertension frequency compared with controls (43 vs 25%, P = 0.007). When comparing lupus patients with MS (n = 41) and without MS (n = 106), no significant differences were observed regarding duration of the disease, SLEDAI or cumulative prednisone dose. Cumulative damage was associated independently with MS (OR 1.98; P = 0.021), whereas HCQ use was found to be protective (OR 0.13; P = 0.015). Patients with lupus presented higher MS prevalence than controls with non-inflammatory disorders, and occurrence of arterial hypertension was also higher. MS was associated with cumulative damage; the use of HCQ showed to be protective against presence of MS.
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Affiliation(s)
- V Bellomio
- Servicio de Reumatología, Hospital Angel Padilla, Universidad Nacional de Tucumán, Tucumán, Argentina
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30
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Spindler BA, Lucero E, Berman A, Sueldo R, Berman H, Santana M, Molina MJ, Góngora V, Cassano G, Paira S, Saurit V, Retamozo S, Alvarellos A, Caerio F, Alba P, Gotero M, Velozo EJ, Ceballos F, Soriano E, Catoggio L, García MA, Eimon A, Agüero S. Metabolic syndrome in Argentinean patients with systemic lupus erythematosus. Lupus 2009; 24:e3. [PMID: 20026520 DOI: 10.1177/0961203309358481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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de la Venta J, Bouzas V, Pucci A, Laguna-Marco MA, Haskel D, te Velthuis SGE, Hoffmann A, Lal J, Bleuel M, Ruggeri G, de Julián Fernández C, García MA. X-ray magnetic circular dichroism and small angle neutron scattering studies of thiol capped gold nanoparticles. J Nanosci Nanotechnol 2009; 9:6434-6438. [PMID: 19908546 DOI: 10.1166/jnn.2009.1877] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
X-ray magnetic circular dichroism (XMCD) and Small Angle Neutron Scattering (SANS) measurements were performed on thiol capped Au nanoparticles (NPs) embedded into polyethylene. An XMCD signal of 0.8 x 10(-4) was found at the Au L3 edge of thiol capped Au NPs embedded in a polyethylene matrix for which Superconducting Quantum Interference Device (SQUID) magnetometry yielded a saturation magnetization, M(S), of 0.06 emu/g(Au). SANS measurements showed that the 3.2 nm average-diameter nanoparticles are 28% polydispersed, but no detectable SANS magnetic signal was found with the resolution and sensitivity accessible with the neutron experiment. A comparison with previous experiments carried out on Au NPs and multilayers, yield to different values between XMCD signals and magnetization measured by SQUID magnetometer. We discuss the origin of those differences.
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Affiliation(s)
- J de la Venta
- Dpto. Fisica de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain
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Melgar MJ, Alonso J, García MA. Mercury in edible mushrooms and underlying soil: bioconcentration factors and toxicological risk. Sci Total Environ 2009; 407:5328-34. [PMID: 19631362 DOI: 10.1016/j.scitotenv.2009.07.001] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2009] [Revised: 06/30/2009] [Accepted: 07/02/2009] [Indexed: 05/08/2023]
Abstract
Wild growing mushrooms are a popular delicacy in many countries, but some species accumulate high levels of toxic heavy metals, e.g., mercury, both in unpolluted and mildly polluted areas. In this study, we examined the accumulation capacity of mercury in edible mushrooms in relation to certain factors and their possible toxicological implications. Total concentrations of mercury were determined by an anodic stripping voltammetric technique using a gold disc as the working electrode in 238 samples of the fruiting bodies of 28 wild growing edible mushrooms species and the underlying soil. The mushrooms were collected from different sites in the province of Lugo (NW Spain). The hymenophore (H) and the rest of the fruiting body (RFB) were analysed separately. The highest mean mercury concentrations (mg/kg dry weight) were found in Boletus pinophilus (6.9 in H and 4.5 in RFB), Agaricus macrosporus (5.1 in H and 3.7 in RFB), Lepista nuda (5.1 in H and 3.1 in RFB) and Boletus aereus (4.6 in H and 3.3 in RFB), while the lowest was found in Agrocybe cylindrica (0.34 in H and 0.26 in RFB) and Fistulina hepatica (0.30 in H and 0.22 in RFB). All mushroom species accumulated mercury (BCF>1) in relation to the underlying soils. There were no statistically significant differences between the mercury levels in the hymenophore and in the rest of the fruiting body. The total mercury concentrations were compared to data in the literature and to levels set by legislation. It was concluded that consumption of the majority of the studied mushrooms is not a toxicological risk as far as mercury content is concerned, although the species B.pinophilus, A.macrosporus, L.nuda and B.aereus should be consumed in low amounts.
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Affiliation(s)
- M J Melgar
- Department of Toxicology, Faculty of Veterinary Medicine, University of Santiago de Compostela, 27002-Lugo, Spain.
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Marrero-Diaz R, Bravo-Cordero JJ, Megías D, García MA, Bartolomé RA, Teixido J, Montoya MC. Polarized MT1-MMP-CD44 interaction and CD44 cleavage during cell retraction reveal an essential role for MT1-MMP in CD44-mediated invasion. ACTA ACUST UNITED AC 2009; 66:48-61. [PMID: 19023892 DOI: 10.1002/cm.20325] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The adhesion molecule CD44 and the membrane-type matrix metalloproteinase MT1-MMP act coordinately in tumor cells to promote cell invasion through a yet unclear mechanism. We are interested in studying the interplay between CD44 and MT1-MMP in carcinoma cells embedded in HA containing three-dimensional collagen I matrices (3D HA-Col I) by time-lapse confocal microscopy imaging. Here we report the in vivo interaction between CD44 and MT1-MMP, revealed by fluorescence resonance energy transfer (FRET) microscopy. MT1-MMP interacts with CD44 preferentially at the trailing edge of the invading tumor cells during rear retraction and on membrane fragments released during the invasion process. A fluorescent biosensor designed to monitor the proteolytic processing of CD44 by live cell imaging demonstrates that cleavage of the CD44 extracellular domain is enriched in the retracting rear ends of invasive tumor cells. Invasion assays showed that MT1-MMP mediates CD44-dependent tumor-cell invasion, whereas CD44 is not essential for MT1-MMP-mediated invasion of 3D HA-Col I matrices. Together, our results support a role for MT1-MMP in cell retraction during CD44-mediated cell invasion.
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Affiliation(s)
- Raquel Marrero-Diaz
- Confocal Microscopy and Cytometry Unit, Biotechnology Programme, Centro Nacional de Investigaciones Oncológicas (CNIO), Madrid, Spain
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Guerrero E, Muñoz-Márquez MA, García MA, Crespo P, Fernández-Pinel E, Hernando A, Fernández A. Surface plasmon resonance and magnetism of thiol-capped gold nanoparticles. Nanotechnology 2008; 19:175701. [PMID: 21825680 DOI: 10.1088/0957-4484/19/17/175701] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Surface plasmon resonance measurements and magnetic characterization studies have been carried out for two types of thiol-capped gold nanoparticles (NPs) with similar diameters between 2.0 and 2.5 nm and different organic molecules linked to the sulfur atom: dodecanethiol and tiopronin. In addition, Au NPs capped with tetraoctyl ammonium bromide have also been included in the investigation since such capping molecules weakly interact with the gold surface atoms and, therefore, this system can be used as a model for naked gold NPs; such particles presented a bimodal size distribution with diameters around 1.5 and 5 nm. The plasmon resonance is non-existent for tiopronin-capped NPs, whereas a trace of such a feature is observed for NPs covered with dodecanethiol molecules and a bulk-like feature is measured for NPs capped with tetralkyl ammonium salts. These differences would indicate that the modification of the surface electronic structure of the Au NPs depends on the geometry and self-assembling capabilities of the capping molecules and on the electric charge transferred between Au and S atoms. Regarding the magnetization, dodecanethiol-capped NPs have a ferromagnetic-like behaviour, while the NPs capped with tiopronin exhibit a paramagnetic behaviour and tetralkyl ammonium-protected NPs are diamagnetic across the studied temperature range; straight chains with a well-defined symmetry axis can induce orbital momentum on surface electrons close to the binding atoms. The orbital momentum not only contributes to the magnetization but also to the local anisotropy, giving rise to permanent magnetism. Due to the domain structure of the adsorbed molecules, orbital momentum is not induced for tiopronin-capped NPs and the charge transfer only induces a paramagnetic spin component.
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Affiliation(s)
- E Guerrero
- Instituto de Ciencia de Materiales de Sevilla, CSIC-US, Avenida Américo Vespucio 49, E-41092 Sevilla, Spain
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Pérez-Buitrago N, García MA, Sabat A, Delgado J, Álvarez A, Mcmillan O, Funk SM. Do headstart programs work? Survival and body condition in headstarted Mona Island iguanas Cyclura cornuta stejnegeri. ENDANGER SPECIES RES 2008. [DOI: 10.3354/esr00130] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Melgar MJ, Alonso J, García MA. Removal of toxic metals from aqueous solutions by fungal biomass of Agaricus macrosporus. Sci Total Environ 2007; 385:12-9. [PMID: 17692896 DOI: 10.1016/j.scitotenv.2007.07.011] [Citation(s) in RCA: 26] [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] [Subscribe] [Scholar Register] [Received: 03/23/2007] [Revised: 07/03/2007] [Accepted: 07/09/2007] [Indexed: 05/16/2023]
Abstract
Fungi such as Agaricus macrosporus show potential for the removal of heavy metals from aqueous solutions contaminated by zinc, copper, mercury, cadmium or lead. This study investigated biosorption of these metals by living or non-living biomass of A. macrosporus from an acid solution, an acid solution supplemented with potassium and phosphorus, and an alkaline solution. Uptake showed a pH-dependent profile. Maximum percentage uptake of all metals was found to occur at alkaline pH (Cu 96%, Pb 89%). With living biomass, metal biosorption was greater and faster in K/P-supplemented acid medium than in non-supplemented acid medium, with equilibrium reached within 15 min for all metals, and the highest percentage uptake being of cadmium (96%). In general, the greatest differences in biosorption capacity were seen for living biomass, between supplemented and non-supplemented acid medium; the smallest differences were between living and dead biomass in alkaline medium. These results support the potential utility of A. macrosporus for heavy metal removal.
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Affiliation(s)
- M J Melgar
- Departamento de Toxicología, Facultad de Veterinaria, Universidad de Santiago de Compostela, C/ Carvalho Calero s/n, 27002-Lugo, Spain.
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Baños-Capilla MC, García MA, Bea J, Pla C, Larrea L, López E. PET/CT image registration: Preliminary tests for its application to clinical dosimetry in radiotherapy. Med Phys 2007; 34:1911-7. [PMID: 17654893 DOI: 10.1118/1.2732031] [Citation(s) in RCA: 2] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The quality of dosimetry in radiotherapy treatment requires the accurate delimitation of the gross tumor volume. This can be achieved by complementing the anatomical detail provided by CT images through fusion with other imaging modalities that provide additional metabolic and physiological information. Therefore, use of multiple imaging modalities for radiotherapy treatment planning requires an accurate image registration method. This work describes tests carried out on a Discovery LS positron emission/computed tomography (PET/CT) system by General Electric Medical Systems (GEMS), for its later use to obtain images to delimit the target in radiotherapy treatment. Several phantoms have been used to verify image correlation, in combination with fiducial markers, which were used as a system of external landmarks. We analyzed the geometrical accuracy of two different fusion methods with the images obtained with these phantoms. We first studied the fusion method used by the PET/CT system by GEMS (hardware fusion) on the basis that there is satisfactory coincidence between the reconstruction centers in CT and PET systems; and secondly the fiducial fusion, a registration method, by means of least-squares fitting algorithm of a landmark points system. The study concluded with the verification of the centroid position of some phantom components in both imaging modalities. Centroids were estimated through a calculation similar to center-of-mass, weighted by the value of the CT number and the uptake intensity in PET. The mean deviations found for the hardware fusion method were: deltax/ +/-sigma = 3.3 mm +/- 1.0 mm and /deltax/ +/-sigma = 3.6 mm +/- 1.0 mm. These values were substantially improved upon applying fiducial fusion based on external landmark points: /deltax/ +/-sigma = 0.7 mm +/- 0.8 mm and /deltax/ +/-sigma = 0.3 mm 1.7 mm. We also noted that differences found for each of the fusion methods were similar for both the axial and helical CT image acquisition protocols.
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Affiliation(s)
- M C Baños-Capilla
- Department of Medical Physics, Radiation Oncology Hospital Virgen del Consuelo, Callosa de Ensarria 12-Valencia, Valencia 46007, Spain
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Bravo-Cordero JJ, Marrero-Diaz R, Megías D, Genís L, García-Grande A, García MA, Arroyo AG, Montoya MC. MT1-MMP proinvasive activity is regulated by a novel Rab8-dependent exocytic pathway. EMBO J 2007; 26:1499-510. [PMID: 17332756 PMCID: PMC1829373 DOI: 10.1038/sj.emboj.7601606] [Citation(s) in RCA: 248] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2006] [Accepted: 01/24/2007] [Indexed: 11/09/2022] Open
Abstract
MT1-matrix metalloproteinase (MT1-MMP) is one of the most critical factors in the invasion machinery of tumor cells. Subcellular localization to invasive structures is key for MT1-MMP proinvasive activity. However, the mechanism driving this polarized distribution remains obscure. We now report that polarized exocytosis of MT1-MMP occurs during MDA-MB-231 adenocarcinoma cell migration into collagen type I three-dimensional matrices. Polarized trafficking of MT1-MMP is triggered by beta1 integrin-mediated adhesion to collagen, and is required for protease localization at invasive structures. Localization of MT1-MMP within VSV-G/Rab8-positive vesicles, but not in Rab11/Tf/TfRc-positive compartment in invasive cells, suggests the involvement of the exocytic traffic pathway. Furthermore, constitutively active Rab8 mutants induce MT1-MMP exocytic traffic, collagen degradation and invasion, whereas Rab8- but not Rab11-knockdown inhibited these processes. Altogether, these data reveal a novel pathway of MT1-MMP redistribution to invasive structures, exocytic vesicle trafficking, which is crucial for its role in tumor cell invasiveness. Mechanistically, MT1-MMP delivery to invasive structures, and therefore its proinvasive activity, is regulated by Rab8 GTPase.
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Affiliation(s)
- Jose J Bravo-Cordero
- Confocal Microscopy and Cytometry Unit, Biotechnology Programme, Spanish Nacional Cancer Research Center (CNIO), Madrid, Spain
| | - Raquel Marrero-Diaz
- Confocal Microscopy and Cytometry Unit, Biotechnology Programme, Spanish Nacional Cancer Research Center (CNIO), Madrid, Spain
| | - Diego Megías
- Confocal Microscopy and Cytometry Unit, Biotechnology Programme, Spanish Nacional Cancer Research Center (CNIO), Madrid, Spain
| | - Laura Genís
- Matrix metalloproteinases Group, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - Aranzazu García-Grande
- Confocal Microscopy and Cytometry Unit, Biotechnology Programme, Spanish Nacional Cancer Research Center (CNIO), Madrid, Spain
| | - Maria A García
- Confocal Microscopy and Cytometry Unit, Biotechnology Programme, Spanish Nacional Cancer Research Center (CNIO), Madrid, Spain
| | - Alicia G Arroyo
- Matrix metalloproteinases Group, Centro Nacional de Investigaciones Cardiovasculares (CNIC), Madrid, Spain
| | - María C Montoya
- Confocal Microscopy and Cytometry Unit, Biotechnology Programme, Spanish Nacional Cancer Research Center (CNIO), Madrid, Spain
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Gallardo MT, Mateos L, Artieda J, Wesslen L, Ruiz C, García MA, Galmés-Truyols A, Martin A, Hernández-Pezzi G, Andersson Y, Gárate T, Christensson D. Outbreak of trichinellosis in Spain and Sweden due to consumption of wild boar meat contaminated with Trichinella britovi. ACTA ACUST UNITED AC 2007; 12:E070315.1. [PMID: 17439785 DOI: 10.2807/esw.12.11.03154-en] [Citation(s) in RCA: 5] [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: 11/20/2022]
Abstract
Early this year, 21 people became ill with trichinellosis in both Spain and Sweden. This was traced to consumption of home-made wild boar sausage from an original source in Spain.
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Affiliation(s)
- M T Gallardo
- Delegacion de Sanidad y Bienestar Social de Castilla y Leon, Palencia, Spain
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40
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Abstract
The IFN-induced double-stranded RNA-dependent protein kinase (PKR) is one of the four mammalian serine-threonine kinases (the three others being HRI, GCN2 and PERK) that phosphorylate the eIF2 alpha translation initiation factor, in response to stress signals, mainly as a result of viral infections. eIF2 alpha phosphorylation results in arrest of translation of both cellular and viral mRNAs, an efficient way to inhibit virus replication. The particularity of PKR is to activate by binding to dsRNA through two N terminal dsRNA binding motifs (dsRBM). PKR activation during a viral infection represents a threat for several viruses, which have therefore evolved to express PKR inhibitors, such as the Vaccinia E3L and K3L proteins. The function of PKR can also be regulated by cellular proteins, either positively (RAX/PACT; Mda7) or negatively (p58IPK, TRBP, nucleophosmin, Hsp90/70). PKR can provoke apoptosis, in part through its ability to control protein translation, but the situation appears to be more complex, as NF-kappaB, ATF-3 and p53 have also been implicated. PKR-induced apoptosis involves mainly the FADD/caspase 8 pathway, while the mitochondrial APAF/caspase 9 pathway is also engaged. As a consequence of the effects of PKR on translation, transcription and apoptosis, PKR can function to control cell growth and cell differentiation, and its activity can be controlled by the action of several oncogenes.
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Affiliation(s)
- M A García
- Department of Molecular and Cellular Biology, Centro Nacional de Biotecnología, CSIC, Ciudad Universitaria Cantoblanco, 28049 Madrid, Spain
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41
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García MA, Gil J, Ventoso I, Guerra S, Domingo E, Rivas C, Esteban M. Impact of protein kinase PKR in cell biology: from antiviral to antiproliferative action. Microbiol Mol Biol Rev 2007; 70:1032-60. [PMID: 17158706 PMCID: PMC1698511 DOI: 10.1128/mmbr.00027-06] [Citation(s) in RCA: 579] [Impact Index Per Article: 34.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The double-stranded RNA-dependent protein kinase PKR is a critical mediator of the antiproliferative and antiviral effects exerted by interferons. Not only is PKR an effector molecule on the cellular response to double-stranded RNA, but it also integrates signals in response to Toll-like receptor activation, growth factors, and diverse cellular stresses. In this review, we provide a detailed picture on how signaling downstream of PKR unfolds and what are the ultimate consequences for the cell fate. PKR activation affects both transcription and translation. PKR phosphorylation of the alpha subunit of eukaryotic initiation factor 2 results in a blockade on translation initiation. However, PKR cannot avoid the translation of some cellular and viral mRNAs bearing special features in their 5' untranslated regions. In addition, PKR affects diverse transcriptional factors such as interferon regulatory factor 1, STATs, p53, activating transcription factor 3, and NF-kappaB. In particular, how PKR triggers a cascade of events involving IKK phosphorylation of IkappaB and NF-kappaB nuclear translocation has been intensively studied. At the cellular and organism levels PKR exerts antiproliferative effects, and it is a key antiviral agent. A point of convergence in both effects is that PKR activation results in apoptosis induction. The extent and strength of the antiviral action of PKR are clearly understood by the findings that unrelated viral proteins of animal viruses have evolved to inhibit PKR action by using diverse strategies. The case for the pathological consequences of the antiproliferative action of PKR is less understood, but therapeutic strategies aimed at targeting PKR are beginning to offer promising results.
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Affiliation(s)
- M A García
- Department of Molecular and Cellular Biology, Centro Nacional de Biotecnología, Ciudad Universitaria Cantoblanco, 28049 Madrid, Spain
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42
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Sánchez ML, García MA, Pérez IA, de Torre B. Ground laser remote sensing measurements of a Saharan dust outbreak in Central Spain. Influence on PM10 concentrations in the lower and upper Spanish plateaus. Chemosphere 2007; 67:229-39. [PMID: 17207516 DOI: 10.1016/j.chemosphere.2006.10.058] [Citation(s) in RCA: 2] [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] [Received: 06/07/2006] [Revised: 10/10/2006] [Accepted: 10/12/2006] [Indexed: 05/13/2023]
Abstract
This paper presents the hourly evolution of a severe Saharan dust outbreak, (SDO), affecting Central Spain over July 23-24, 2004 measured with a laser remote sensing device at a location close to the Guadarrama mountain range foothills and its impact on PM10 levels (particles with an aerodynamic diameter below 10 microm) recorded at four contrasting monitoring stations located in the upper and lower Spanish plateau, some 170km apart. During the period of study the Saharan dust layer, (SDL), presented significant hourly variability in height (3600-1500m), depth (1500-700m) and aerosol dust loading (extinction coefficient, EC, 0.22-1.28km(-1)). Overnight layering was generally observed whereas a well mixed layer prevailed in the afternoon. The (SDO) impact on the lower levels took place approximately 12h after the (SDL) was initially observed and triggered by a descending dust enriched, evidencing the important role of subsidence over the presence of dust in lower altitudes. During the event, PM10 levels at all the stations exceeded EU air quality daily mean standards, 50 microgm(-3), on 2-4days. The maximum values ranged from 185 to 245 microgm(-3) depending on the monitoring station. The impact on PM10 spread from 2days in the upper plateau to 3-4 in the lower plateau, in agreement with the geographical location of the monitoring stations with respect to the southwest origin of the intrusion. The impact was even more dramatic on PM10 hourly concentrations, leading to maximum hourly peaks ranging from 322 to 598 microgm(-3) again depending on the monitoring station. Correlations between EC vertical profiles and PM10 hourly concentrations at the monitoring stations showed the great influence of the (SDO) on surface concentrations. The best linear fits corresponded to the extinction coefficients in the lower altitudes (close to the lower range of the device 500-650m), EC2, yielding satisfactory correlation coefficients ranging from 0.68 to 0.71. The low variability of the slope of each individual linear fit, 19.2%, shows the similar impact of (SDO) on the PM10 hourly concentrations recorded in the area under study.
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Affiliation(s)
- M L Sánchez
- Department of Applied Physics, University of Valladolid, 47005 Valladolid, Spain.
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43
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Abelson AK, Johansson CM, Kozyrev SV, Kristjansdottir H, Gunnarsson I, Svenungsson E, Jönsen A, Lima G, Scherbarth HR, Gamron S, Allievi A, Palatnik SA, Alvarellos A, Paira S, Graf C, Guillerón C, Catoggio LJ, Prigione C, Battagliotti CG, Berbotto GA, García MA, Perandones CE, Truedsson L, Steinsson K, Sturfelt G, Pons-Estel B, Alarcón-Riquelme ME. No evidence of association between genetic variants of the PDCD1 ligands and SLE. Genes Immun 2006; 8:69-74. [PMID: 17136123 DOI: 10.1038/sj.gene.6364360] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [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: 12/21/2022]
Abstract
PDCD1, an immunoreceptor involved in peripheral tolerance has previously been shown to be genetically associated with systemic lupus erythematosus (SLE). PDCD1 has two ligands whose genes are located in close proximity on chromosome 9p24. Our attention was drawn to these ligands after finding suggestive linkage to a marker (gata62f03, Z=2.27) located close to their genes in a genome scan of Icelandic families multiplex for SLE. Here, we analyse Swedish trios (N=149) for 23 single nucleotide polymorphisms (SNPs) within the genes of the PDCD1 ligands. Initially, indication of association to eight SNPs was observed, and these SNPs were therefore also analysed in Mexican trios (N=90), as well as independent sets of patients and controls from Sweden (152 patients, 448 controls) and Argentina (288 patients, 288 controls). We do not find support for genetic association to SLE. This is the first genetic study of SLE and the PDCD1 ligands and the lack of association in several cohorts implies that these genes are not major risk factors for SLE.
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Affiliation(s)
- A K Abelson
- Department of Genetics and Pathology, Rudbeck Laboratory, Uppsala University, Uppsala, Sweden
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Crespo P, García MA, Fernández Pinel E, Multigner M, Alcántara D, de la Fuente JM, Penadés S, Hernando A. Fe impurities weaken the ferromagnetic behavior in Au nanoparticles. Phys Rev Lett 2006; 97:177203. [PMID: 17155503 DOI: 10.1103/physrevlett.97.177203] [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] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2006] [Indexed: 05/12/2023]
Abstract
In this Letter, we report on a crucial experiment showing that magnetic impurities reduce the ferromagnetic order temperature in thiol-capped Au glyconanoparticles (GNPs). The spontaneous magnetization of AuFe GNPs exhibits a fast decrease with temperature that contrasts with the almost constant value of the magnetization observed in Au NPs. Moreover, hysteresis disappears below 300 K. Both features indicate that Fe impurities reduce the high local anisotropy field responsible for the ferromagnetic behavior in Au GNPs. As a consequence, the amazing ferromagnetism in Au NPs should not be associated with the presence of magnetic impurities.
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Affiliation(s)
- P Crespo
- Instituto de Magnetismo Aplicado (RENFE-UCM-CSIC), PO Box 155, 28230 Las Rozas, Madrid, Spain
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Mali S, Grossmann MVE, García MA, Martino MN, Zaritzky NE. Effects of controlled storage on thermal, mechanical and barrier properties of plasticized films from different starch sources. J FOOD ENG 2006. [DOI: 10.1016/j.jfoodeng.2005.04.031] [Citation(s) in RCA: 258] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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46
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Izquierdo-Barba I, Conde F, Olmo N, Lizarbe MA, García MA, Vallet-Regí M. Vitreous SiO2-CaO coatings on Ti6Al4V alloys: reactivity in simulated body fluid versus osteoblast cell culture. Acta Biomater 2006; 2:445-55. [PMID: 16765884 DOI: 10.1016/j.actbio.2006.02.002] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2005] [Revised: 01/23/2006] [Accepted: 02/09/2006] [Indexed: 10/24/2022]
Abstract
Vitreous coatings of the SiO(2)-CaO system have been prepared on Ti6Al4V substrates by the sol-gel method. The textural parameters (porosity and roughness) and thickness of the films obtained increase when the concentration of the precursor solutions is raised. In vitro studies of these coatings have been performed using two approaches: soaking in simulated body fluid, and by growing osteoblasts on these materials. The results of both studies show differences in terms of chemical reactivity. While in simulated body fluid the coatings were dissolved without forming a bioactive surface, when osteoblast-like cells grew on the coatings they were more stable. Furthermore, cell culture assays show biocompatible behavior of these coatings making them of potential interest for clinical applications. The effect of the textural parameters of the obtained coatings on the cell functions (attachment, spreading, proliferation and differentiation) has also been studied. The results show an increase in these cell parameters as the roughness and porosity of the coatings increase.
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Affiliation(s)
- I Izquierdo-Barba
- Departamento de Química Inorgánica y Bioinorgánica, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
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47
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Hernando A, Crespo P, García MA. Origin of orbital ferromagnetism and giant magnetic anisotropy at the nanoscale. Phys Rev Lett 2006; 96:057206. [PMID: 16486977 DOI: 10.1103/physrevlett.96.057206] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2005] [Indexed: 05/06/2023]
Abstract
The origin of orbital magnetism recently observed in different nanostructured films and particles is discussed as a consequence of spin-orbit coupling. It is shown that contact potentials induced at the thin film surface by broken symmetries, as domain boundaries in self-assembled monolayers, lead to orbital states that in some cases are of large radius. The component of the angular momentum normal to the surface can reach very high values that decrease the total energy by decreasing spin-orbit interaction energy. Intraorbital ferromagnetic spin correlations induce orbital momenta alignment. The estimated values of the magnetic moments per atom are in good agreement with the experimental observations in thiol capped gold films and nanoparticles.
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Affiliation(s)
- A Hernando
- Instituto de Magnetismo Aplicado, RENFE-UCM-CSIC, and Departamento de Física de Materiales UCM, P.O. Box 155, Las Rozas, Madrid 28230, Spain
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48
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Hernando A, García MA. Comment on "bosons as the origin for giant magnetic properties of organic monolayers". Phys Rev Lett 2006; 96:029703; discussion 029704. [PMID: 16486665 DOI: 10.1103/physrevlett.96.029703] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2005] [Indexed: 05/06/2023]
Affiliation(s)
- A Hernando
- Instituto de Magnetismo Aplicado RENFE-UCM and Departamento de Física de Materiales UCM Post Office Box 155 Las Rozas Madrid 28230 Spain
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Abstract
In this paper, we reviewed some relevant aspects of the magnetic properties of metallic nanoparticles with small size (below 4 nm), covering the size effects in nanoparticles of magnetic materials, as well as the appearance of magnetism at the nanoscale in materials that are nonferromagnetic in bulk. These results are distributed along the text that has been organized around three important items: fundamental magnetic properties, different fabrication procedures, and characterization techniques. A general introduction and some experimental results recently obtained in Pd and Au nanoparticles have also been included. Finally, the more promising applications of magnetic nanoparticles in biomedicine are indicated. Special care was taken to complete the literature available on the subject.
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Affiliation(s)
- A Hernando
- Instituto de Magnetismo Aplicado, Depto. de Física de Materiales, Universidad Complutense, PO Box 155, Las Rozas, Madrid, Spain.
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50
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Muñoz-Fontela C, Collado M, Rodriguez E, García MA, Alvarez-Barrientos A, Arroyo J, Nombela C, Rivas C. Identification of a nuclear export signal in the KSHV latent protein LANA2 mediating its export from the nucleus. Exp Cell Res 2005; 311:96-105. [PMID: 16214130 DOI: 10.1016/j.yexcr.2005.08.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2005] [Revised: 08/25/2005] [Accepted: 08/25/2005] [Indexed: 11/28/2022]
Abstract
LANA2 is a latent protein detected in Kaposi's sarcoma-associated herpesvirus (KSHV)-infected B cells that inhibits p53-dependent transcriptional transactivation and apoptosis and PKR-dependent apoptosis, suggesting an important role in the transforming activity of the virus. It has been reported that LANA2 localizes into the nucleus of both KSHV-infected B cells and transiently transfected HeLa cells. In this study, we show that LANA2 is a nucleocytoplasmic shuttling protein that requires a Rev-type nuclear export signal located in the C-terminus to direct the protein to the cytoplasm, through an association with the export receptor CRM1. In addition, a functional protein kinase B (PKB)/Akt phosphorylation motif partially overlapping with the nuclear export signal was identified. Nuclear exclusion of LANA2 was negatively regulated by the phosphorylation of threonine 564 by Akt. The ability of LANA2 to shuttle between nucleus and cytoplasm has implications for the function of this viral protein.
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Affiliation(s)
- C Muñoz-Fontela
- Departamento de Microbiologia II, Facultad de Farmacia, Universidad Complutense de Madrid, Plaza Ramon y Cajal sn, 28040 Madrid, Spain
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