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Saint-Pierre G, Conei D, Cantillana P, Raijmakers M, Vera A, Gutiérrez D, Kennedy C, Peralta P, Ramonda P. Comparison of Two Tuberculosis Infection Tests in a South American Tertiary Hospital: STANDARD F TB-Feron FIA vs. QIAreachTM QuantiFERON-TB. Diagnostics (Basel) 2023; 13:diagnostics13061162. [PMID: 36980470 PMCID: PMC10046924 DOI: 10.3390/diagnostics13061162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Revised: 03/10/2023] [Accepted: 03/14/2023] [Indexed: 03/22/2023] Open
Abstract
Introduction: Tuberculosis (TB) is one of the most prevalent respiratory diseases in the world. In 2020 there were at least 9.9 million new infections, with 1.5 million deaths. Approximately 10% of people infected with Mycobacterium tuberculosis develop the disease during the first 2 to 5 years after infection. In South America, the diagnosis of Latent Tuberculosis Infections (LTBI) continues to be performed through the Mantoux tuberculin skin test (TST). Objective: The objective of our study was to compare the sensitivity of a new immunofluorescence IGRA test against a widely available IGRA kit on the market. Material and method: Close contact with infectious TB patients, HIV patients, or immunocompromised for another cause were recruited. Two interferon-gamma release assay (IGRA) diagnostic kits were used and compared with TST. Results: 76 patients were recruited, 93.42% were Chilean nationality, and 98.68% of the patients did not have immunosuppression. The sensitivity of the new technique was 88.89%, and the specificity was 92.50% in the study population compared to the IGRA previously used. In the subgroup older than 36 years, the sensitivity was 95.65%, and the specificity was 89.47%. Conclusion: IGRA techniques are a new resource in clinical laboratories to make an accurate diagnosis of LTBI in the region of the Americas. In our population, the greatest benefit of this new IGRA would be observed in people over 36 years of age, where the sensitivity of the technique was like that of the currently available test.
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Affiliation(s)
- Gustavo Saint-Pierre
- Unidad Microbiología Sección Koch, Hospital Barros Luco Trudeau, Servicio de Salud Metropolitano Sur, Santiago 8900000, Chile
- Programa de Virología, ICBM, Facultad de Medicina, Universidad de Chile, Independencia 1027, Santiago 8380453, Chile
- Correspondence:
| | - Daniel Conei
- Departamento de Ciencias de la Salud, Universidad de Aysén, Coyhaique 5951537, Chile;
| | - Patricia Cantillana
- Unidad Microbiología Sección Koch, Hospital Barros Luco Trudeau, Servicio de Salud Metropolitano Sur, Santiago 8900000, Chile
| | - Mariella Raijmakers
- Medicina Interna, University of Santiago, Santiago 9170022, Chile
- Departamento de Medicina Interna, Hospital Barros Luco Trudeau, Servicio de Salud Metropolitano Sur, Santiago 8900000, Chile
| | - Andrea Vera
- Unidad Microbiología Sección Koch, Hospital Barros Luco Trudeau, Servicio de Salud Metropolitano Sur, Santiago 8900000, Chile
| | - Daniela Gutiérrez
- Unidad Microbiología Sección Koch, Hospital Barros Luco Trudeau, Servicio de Salud Metropolitano Sur, Santiago 8900000, Chile
| | - Cristopher Kennedy
- Unidad Microbiología Sección Koch, Hospital Barros Luco Trudeau, Servicio de Salud Metropolitano Sur, Santiago 8900000, Chile
| | - Paulina Peralta
- Policlínico Infectología/Inmunología, Hospital Barros Luco Trudeau, Servicio de Salud Metropolitano Sur, Santiago 8900000, Chile
| | - Paulina Ramonda
- Servicio de Salud Metropolitano Sur, Santiago 8900000, Chile
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Salgado M, Molina R, Vázquez EB, Martínez E, Cillán E, Fullana T, Villa J, Lobo M, Masvidal M, Porta R, Campos B, Garicano F, Pampols M, Fernández I, Font C, Martínez P, Gutiérrez D, Horvath E, Costa A, Malheiro M, Arias D, for the CARTAGO study group. PO-54: Preliminary evaluation of venous thromboembolic risk in patients with colorectal cancer from the CARTAGO study. Thromb Res 2022. [DOI: 10.1016/s0049-3848(22)00244-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Martín AM, Lecumberri R, Souto J, Aparicio J, Obispo B, Sanchez A, Aguayo C, Gutiérrez D, Viñuela-Benéitez M, Menke S, Casero H, Arumí D, Hernández-Presa MÁ. PO-57: Venous thromboembolism recurrence during anticoagulant treatment in gastrointestinal cancer patients. Thromb Res 2022. [DOI: 10.1016/s0049-3848(22)00247-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Benavides A, Gutiérrez D, Epuyao N, Modak B, Imarai M, Valenzuela B. Alpinone: A positive regulator molecule of immune antiviral response in Atlantic salmon kidney cells. Dev Comp Immunol 2022; 126:104262. [PMID: 34543663 DOI: 10.1016/j.dci.2021.104262] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 09/14/2021] [Accepted: 09/14/2021] [Indexed: 06/13/2023]
Abstract
Alpinone is a flavonoid obtained from the resinous exudate of Heliotropium huascoense. This flavonoid shows antiviral activity against the infectious salmon anemia virus (ISAV), which causes severe disease in farmed Atlantic salmon. Here, we aim to elucidate mechanisms underlying the antiviral effects of the flavonoid. In this regard, we evaluated whether Alpinone can act upregulating the pattern-recognition receptor genes, i.e., the RIG-I-like, TLR3, and TLR9 genes, and the genes of the downstream signaling pathways. Transcriptional expression of the genes was analyzed using real-time PCR after 8, 24, and 48 h treatment of salmon kidney adherent cells with 15 μg/mL of Alpinone. First, we showed that Alpinone induced IFNa expression in the kidney adherent cells, indicating that this type of salmon cells is in part responsible for the effects previously reported in vivo. Upregulation of the IFN-induced myxovirus resistance (Mx) gene was also observed in the head kidney cells in response to the treatment. Overexpression reached a maximum level at 24 h post-treatment. Interestingly, Alpinone also induced upregulation of the cytosolic receptors of ssRNA, named Retinoic acid-inducible gene I (RIG-I) and Melanoma Differentiation-Associated protein 5 (MDA5), but there were no effects on the transcriptional expression of the TLR3 and TLR9 endosomal receptors. In addition, Alpinone upregulated the expression of genes encoding the main components of the RIG-I/MDA5 signaling pathways, such as the mitochondrial antiviral-signaling protein (MAVS), TNF Receptor Associated Factor 3 (TRAF3), TANK-binding kinase 1 (TBK1), I-kappaB kinase ε (IKKε), the transcription factors IRF-3, and IRF7. The increased expression of all these genes is consistent with the upregulation of IFNa and Mx mRNAs. Because BX795 completely prevents Alpinone-dependent upregulation of IFNa and IRF3, the flavonoid targets seem to be upstream of the kinases TBK1 and IKKε. Altogether, this study contributes to elucidating the mechanisms involved in Alpinone antiviral activity in fish. Alpinone can be used to counteract virus mechanisms of evasion where the onset of interferon-mediated response is prevented or delayed.
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Affiliation(s)
- Almendra Benavides
- Natural Product Chemistry Laboratory, Aquatic Biotechnology Center, Chemistry and Biology Faculty, Environmental Sciences Department, University of Santiago of Chile, Av. Bernardo O'Higgins, 3363, Santiago, Chile.
| | - Daniela Gutiérrez
- Natural Product Chemistry Laboratory, Aquatic Biotechnology Center, Chemistry and Biology Faculty, Environmental Sciences Department, University of Santiago of Chile, Av. Bernardo O'Higgins, 3363, Santiago, Chile.
| | - Nadia Epuyao
- Natural Product Chemistry Laboratory, Aquatic Biotechnology Center, Chemistry and Biology Faculty, Environmental Sciences Department, University of Santiago of Chile, Av. Bernardo O'Higgins, 3363, Santiago, Chile.
| | - Brenda Modak
- Natural Product Chemistry Laboratory, Aquatic Biotechnology Center, Chemistry and Biology Faculty, Environmental Sciences Department, University of Santiago of Chile, Av. Bernardo O'Higgins, 3363, Santiago, Chile.
| | - Mónica Imarai
- Immunology Laboratory, Aquatic Biotechnology Center, Biology Department, Chemistry and Biology Faculty, University of Santiago of Chile, Av. Bernardo O'Higgins, 3363, Santiago, Chile.
| | - Beatriz Valenzuela
- Natural Product Chemistry Laboratory, Aquatic Biotechnology Center, Chemistry and Biology Faculty, Environmental Sciences Department, University of Santiago of Chile, Av. Bernardo O'Higgins, 3363, Santiago, Chile.
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5
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Leiva LE, Pincheira A, Elgamal S, Kienast SD, Bravo V, Leufken J, Gutiérrez D, Leidel SA, Ibba M, Katz A. Modulation of Escherichia coli Translation by the Specific Inactivation of tRNA Gly Under Oxidative Stress. Front Genet 2020; 11:856. [PMID: 33014012 PMCID: PMC7461829 DOI: 10.3389/fgene.2020.00856] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Accepted: 07/14/2020] [Indexed: 11/17/2022] Open
Abstract
Bacterial oxidative stress responses are generally controlled by transcription factors that modulate the synthesis of RNAs with the aid of some sRNAs that control the stability, and in some cases the translation, of specific mRNAs. Here, we report that oxidative stress additionally leads to inactivation of tRNAGly in Escherichia coli, inducing a series of physiological changes. The observed inactivation of tRNAGly correlated with altered efficiency of translation of Gly codons, suggesting a possible mechanism of translational control of gene expression under oxidative stress. Changes in translation also depended on the availability of glycine, revealing a mechanism whereby bacteria modulate the response to oxidative stress according to the prevailing metabolic state of the cells.
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Affiliation(s)
- Lorenzo Eugenio Leiva
- Programa de Biología Celular y Molecular, ICBM, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Andrea Pincheira
- Programa de Biología Celular y Molecular, ICBM, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Sara Elgamal
- Department of Microbiology and The Center for RNA Biology, The Ohio State University, Columbus, OH, United States
| | - Sandra D Kienast
- Max Planck Research Group for RNA Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany.,Cells-in-Motion Cluster of Excellence and Faculty of Medicine, University of Münster, Münster, Germany.,Research Group for RNA Biochemistry, Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland
| | - Verónica Bravo
- Unidad de Microbiología, Escuela de Medicina, Facultad de Ciencias Médicas, Universidad de Santiago de Chile, Santiago, Chile
| | - Johannes Leufken
- Max Planck Research Group for RNA Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany.,Cells-in-Motion Cluster of Excellence and Faculty of Medicine, University of Münster, Münster, Germany.,Research Group for RNA Biochemistry, Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland
| | - Daniela Gutiérrez
- Programa de Biología Celular y Molecular, ICBM, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Sebastian A Leidel
- Max Planck Research Group for RNA Biology, Max Planck Institute for Molecular Biomedicine, Münster, Germany.,Cells-in-Motion Cluster of Excellence and Faculty of Medicine, University of Münster, Münster, Germany.,Research Group for RNA Biochemistry, Department of Chemistry and Biochemistry, University of Bern, Bern, Switzerland
| | - Michael Ibba
- Department of Microbiology and The Center for RNA Biology, The Ohio State University, Columbus, OH, United States
| | - Assaf Katz
- Programa de Biología Celular y Molecular, ICBM, Facultad de Medicina, Universidad de Chile, Santiago, Chile
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6
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Gerstmans H, Grimon D, Gutiérrez D, Lood C, Rodríguez A, van Noort V, Lammertyn J, Lavigne R, Briers Y. A VersaTile-driven platform for rapid hit-to-lead development of engineered lysins. Sci Adv 2020; 6:eaaz1136. [PMID: 32537492 PMCID: PMC7269649 DOI: 10.1126/sciadv.aaz1136] [Citation(s) in RCA: 64] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 03/24/2020] [Indexed: 06/11/2023]
Abstract
Health care authorities are calling for new antibacterial therapies to cope with the global emergence of antibiotic-resistant bacteria. Bacteriophage-encoded lysins are a unique class of antibacterials with promising (pre)clinical progress. Custom engineering of lysins allows for the creation of variants against potentially any bacterial pathogen. We here present a high-throughput hit-to-lead development platform for engineered lysins. The platform is driven by VersaTile, a new DNA assembly method for the rapid construction of combinatorial libraries of engineered lysins. We constructed approximately 10,000 lysin variants. Using an iterative screening procedure, we identified a lead variant with high antibacterial activity against Acinetobacter baumannii in human serum and an ex vivo pig burn wound model. This generic platform could offer new opportunities to populate the preclinical pipeline with engineered lysins for diverse (therapeutic) applications.
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Affiliation(s)
- H. Gerstmans
- Department of Biotechnology, Ghent University, Valentin Vaerwyckweg 1, 9000 Gent, Belgium
- Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21, 3001 Leuven, Belgium
- Department of Biosystems, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - D. Grimon
- Department of Biotechnology, Ghent University, Valentin Vaerwyckweg 1, 9000 Gent, Belgium
| | - D. Gutiérrez
- Department of Biotechnology, Ghent University, Valentin Vaerwyckweg 1, 9000 Gent, Belgium
- Dairy Research Institute of Asturias, Spanish National Research Council (IPLA-CSIC), Paseo Río Linares, s/n, 33300 Villaviciosa, Asturias, Spain
| | - C. Lood
- Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21, 3001 Leuven, Belgium
- Department of Microbial and Molecular Systems, KU Leuven, Kasteelpark Arenberg 23, 3001 Leuven, Belgium
| | - A. Rodríguez
- Dairy Research Institute of Asturias, Spanish National Research Council (IPLA-CSIC), Paseo Río Linares, s/n, 33300 Villaviciosa, Asturias, Spain
| | - V. van Noort
- Department of Microbial and Molecular Systems, KU Leuven, Kasteelpark Arenberg 23, 3001 Leuven, Belgium
- Institute of Biology Leiden, Leiden University, Sylviusweg 72, 2333 Leiden, Netherlands
| | - J. Lammertyn
- Department of Biosystems, KU Leuven, Willem de Croylaan 42, 3001 Leuven, Belgium
| | - R. Lavigne
- Department of Biosystems, KU Leuven, Kasteelpark Arenberg 21, 3001 Leuven, Belgium
| | - Y. Briers
- Department of Biotechnology, Ghent University, Valentin Vaerwyckweg 1, 9000 Gent, Belgium
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Cádiz L, Torres A, Valdés R, Vera G, Gutiérrez D, Levine MM, Montero DA, O'Ryan M, Rasko DA, Stine OC, Vidal R, Del Canto F. Coli Surface Antigen 26 Acts as an Adherence Determinant of Enterotoxigenic Escherichia coli and Is Cross-Recognized by Anti-CS20 Antibodies. Front Microbiol 2018; 9:2463. [PMID: 30459723 PMCID: PMC6232838 DOI: 10.3389/fmicb.2018.02463] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2018] [Accepted: 09/26/2018] [Indexed: 11/13/2022] Open
Abstract
The coli surface antigen 26 (CS26) of enterotoxigenic Escherichia coli (ETEC) had been described as a putative adhesive pilus based on the partial sequence of the crsH gene, detected in isolates from children with diarrhea in Egypt. However, its production and activity as adherence determinant has not been experimentally addressed. The crsH was identified as a homolog of genes encoding structural subunits of ETEC colonization factors (CFs) CS12, CS18, and CS20. These CFs, along with the recently discovered CS30, belong to the γ2 family of pili assembled by the chaperone-usher pathway (CU pili). Further, the complete CS26 locus, crsHBCDEFG, was described in an O141 ETEC strain (ETEC 100664) obtained from a diarrhea case in The Gambia, during the Global Enterics Multicenter Study. Here, we report that CS26 is a pilus of ∼10 nm in diameter, with the capacity to increase the cell adherence of the non-pathogenic strain E. coli DH10B. As for other related pili, production of CS26 seems to be regulated by phase variation. Deletion of crsHBCDEFG in ETEC 100664 significantly decreased its adherence capacity, which was recovered by in trans complementation. Furthermore, CrsH was cross-recognized by polyclonal antibodies directed against the major structural subunit of CS20, CsnA, as determined by Western blotting and immunogold labeling. ETEC CS26+ strains were found to harbor the heat-labile enterotoxin only, within three different sequence types of phylogroups A and B1, the latter suggesting acquisition through independent events of horizontal transfer. Overall, our results demonstrate that CS26 is an adhesive pilus of human ETEC. In addition, cross-reactivity with anti-CsnA antibodies indicate presence of common epitopes in γ2-CFs.
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Affiliation(s)
- Leandro Cádiz
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Alexia Torres
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Raúl Valdés
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Gabriel Vera
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago, Chile
| | - Daniela Gutiérrez
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Myron M Levine
- Center for Vaccine Development and Global Health, Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - David A Montero
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Miguel O'Ryan
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Instituto Milenio de Inmunología e Inmunoterapia, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - David A Rasko
- Institute for Genome Sciences, Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, United States
| | - O Colin Stine
- Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, MD, United States
| | - Roberto Vidal
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile.,Instituto Milenio de Inmunología e Inmunoterapia, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Felipe Del Canto
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
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Gutiérrez D, Sánchez Mora RM. Tratamientos alternativos de medicina tradicional para Chlamydia trachomatis, agente causal de una infección asintomática. nova 2018. [DOI: 10.22490/24629448.2836] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
En la actualidad, Chlamydia trachomatis (CT) es una de las causas más frecuentes de infecciones de transmisión sexual (ITS) y morbilidad reproductiva en el mundo, Incluye tanto países desarrolladoscomo en vía de desarrollo, con un reporte alrededor de 92 millones de casos anuales. CT es una bacteria intracelular obligada cuyo inicio de la infección es asintomático, causa infección crónica, puede generar infección persistente y complicaciones como cáncer de ovario. Las infecciones por CT son asintomáticas en el 70% de las mujeres y el 40% de los hombres, lo que dificulta el diagnóstico en las fases tempranas de la infección y el tratamiento oportuno, lo que conlleva a un aumento en los contagios en la población. De acuerdo con la Organización Mundial de la Salud (OMS), el tratamiento para CT incluye la utilización de antibióticos tipo tetraciclinas, macrólidos y fluoroquinolonas. Sin embargo, a pesar de su alta tasa de eficacia, cada vez son más recurrentes las infecciones. Reportes recientes han demostrado resistencia por parte de los cuerpos elementales y se ha podido determinar que los antibióticos disminuyen la población de lactobacillus vaginales beneficiosos, causando mayores complicaciones en los pacientes. Basados en estos hallazgos, las investigaciones actuales se han centrado en terapias alternativas que reduzcan la actividad antichlamydial y que sean de libre acceso, generando el menor daño posible en los pacientes.
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Pérez A, Machado W, Gutiérrez D, Borges AC, Patchineelam SR, Sanders CJ. Carbon accumulation and storage capacity in mangrove sediments three decades after deforestation within a eutrophic bay. Mar Pollut Bull 2018; 126:275-280. [PMID: 29421098 DOI: 10.1016/j.marpolbul.2017.11.018] [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] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 11/08/2017] [Accepted: 11/13/2017] [Indexed: 06/08/2023]
Abstract
A dated sediment core from an eutrophic mangrove area presented non-significant differences in carbon accumulation rates before (55.7±10.2gm-2yr-1) and after three decades of deforestation (59.7±7.2gm-2yr-1). Although eutrophication effects appear to compensate the loss of mangrove organic matter input, the results in this work show a threefold lower carbon accumulation than the global averages estimated for mangrove sediments. The effects of increasing eutrophication and enhanced sediment dry bulk density observed after deforestation (~30% higher) did not result in higher carbon stocks. Moreover, the lower TOC:OP (<400) and C:N (~20) molar ratios, as well as increased nutrient accumulation, reflect the dominance of phytoplankton-derived organic matter after deforestation, resulting in less-efficient sedimentary carbon sinks. These results indicate that the organic material deposited from eutrophication may not compensate mangrove deforestation losses on carbon accumulation in mangrove ecosystems.
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Affiliation(s)
- A Pérez
- Programa de Pós-Graduação em Geoquímica, Universidade Federal Fluminense, Departamento de Geoquímica, Rua Outeiro São João Baptista s/n, Niteroi, RJ, Brazil.
| | - W Machado
- Programa de Pós-Graduação em Geoquímica, Universidade Federal Fluminense, Departamento de Geoquímica, Rua Outeiro São João Baptista s/n, Niteroi, RJ, Brazil
| | - D Gutiérrez
- Dirección General de Investigaciones en Oceanografía y Cambio Climático, Instituto del Mar del Perú, Av. Gamarra y General Valle, s/n, Chucuito, Callao, Peru
| | - A C Borges
- Programa de Pós-Graduação em Geoquímica, Universidade Federal Fluminense, Departamento de Geoquímica, Rua Outeiro São João Baptista s/n, Niteroi, RJ, Brazil
| | - S R Patchineelam
- Programa de Pós-Graduação em Geoquímica, Universidade Federal Fluminense, Departamento de Geoquímica, Rua Outeiro São João Baptista s/n, Niteroi, RJ, Brazil
| | - C J Sanders
- National Marine Science Centre, Southern Cross University, Coffs Harbour, New South Wales, Australia
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Del Canto F, O'Ryan M, Pardo M, Torres A, Gutiérrez D, Cádiz L, Valdés R, Mansilla A, Martínez R, Hernández D, Caro B, Levine MM, Rasko DA, Hill CM, Pop M, Stine OC, Vidal R. Chaperone-Usher Pili Loci of Colonization Factor-Negative Human Enterotoxigenic Escherichia coli. Front Cell Infect Microbiol 2017; 6:200. [PMID: 28111618 PMCID: PMC5216030 DOI: 10.3389/fcimb.2016.00200] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2016] [Accepted: 12/14/2016] [Indexed: 01/05/2023] Open
Abstract
Enterotoxigenic Escherichia coli (ETEC) is one of the most common causes of diarrhea worldwide. Among the 25 different ETEC adhesins, 22 are known as "colonization factors" (CFs), of which 17 are assembled by the chaperone-usher (CU) mechanism. Currently, there is no preventive therapy against ETEC, and CFs have been proposed as components for vaccine development. However, studies of diarrhea-causing ETEC strains worldwide indicate that between 15 and 50% of these are negative for known CFs, hindering the selection of the most widespread structures and suggesting that unknown adhesins remain to be identified. Here, we report the result of a comprehensive analysis of 35 draft genomes of ETEC strains which do not carry known adhesin genes; our goal was to find new CU pili loci. The phylogenetic profiles and serogroups of these strains were highly diverse, a majority of which produced only the heat-labile toxin. We identified 10 pili loci belonging to CU families β (1 locus), γ2 (7 loci), κ (1 locus), and π (1 locus), all of which contained the required number of open reading frames (ORFs) to encode functional structures. Three loci were variants of previously-known clusters, three had been only-partially described, and four are novel loci. Intra-loci genetic variability identified would allow the synthesis of up to 14 different structures. Clusters of putative γ2-CU pili were most common (23 strains), followed by putative β-CU pili (12 strains), which have not yet been fully characterized. Overall, our findings significantly increase the number of ETEC adhesion genes associated with human infections.
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Affiliation(s)
- Felipe Del Canto
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile Santiago, Chile
| | - Miguel O'Ryan
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile Santiago, Chile
| | - Mirka Pardo
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile Santiago, Chile
| | - Alexia Torres
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile Santiago, Chile
| | - Daniela Gutiérrez
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile Santiago, Chile
| | - Leandro Cádiz
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile Santiago, Chile
| | - Raul Valdés
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de ChileSantiago, Chile; Facultad de Química y Biología, Universidad de Santiago de ChileSantiago, Chile
| | - Aquiles Mansilla
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile Santiago, Chile
| | - Rodrigo Martínez
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile Santiago, Chile
| | - Daniela Hernández
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile Santiago, Chile
| | - Benjamin Caro
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile Santiago, Chile
| | - Myron M Levine
- Center for Vaccine Development, University of Maryland School of Medicine Baltimore, MD, USA
| | - David A Rasko
- Department of Microbiology and Immunology, Institute for Genome Sciences, University of Maryland School of Medicine Baltimore, MD, USA
| | - Christopher M Hill
- Center for Bioinformatics and Computational Biology, University of Maryland Institute for Advanced Computer Studies College Park, MD, USA
| | - Mihai Pop
- Center for Bioinformatics and Computational Biology, University of Maryland Institute for Advanced Computer Studies College Park, MD, USA
| | - O Colin Stine
- Department of Epidemiology and Public Health, University of Maryland School of Medicine Baltimore, MD, USA
| | - Roberto Vidal
- Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile Santiago, Chile
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11
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Sánchez M, Ceci ML, Gutiérrez D, Anguita-Salinas C, Allende ML. Mechanosensory organ regeneration in zebrafish depends on a population of multipotent progenitor cells kept latent by Schwann cells. BMC Biol 2016; 14:27. [PMID: 27055439 PMCID: PMC4823859 DOI: 10.1186/s12915-016-0249-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 03/22/2016] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Regenerating damaged tissue is a complex process, requiring progenitor cells that must be stimulated to undergo proliferation, differentiation and, often, migratory behaviors and morphological changes. Multiple cell types, both resident within the damaged tissue and recruited to the lesion site, have been shown to participate. However, the cellular and molecular mechanisms involved in the activation of progenitor cell proliferation and differentiation after injury, and their regulation by different cells types, are not fully understood. The zebrafish lateral line is a suitable system to study regeneration because most of its components are fully restored after damage. The posterior lateral line (PLL) is a mechanosensory system that develops embryonically and is initially composed of seven to eight neuromasts distributed along the trunk and tail, connected by a continuous stripe of interneuromastic cells (INCs). The INCs remain in a quiescent state owing to the presence of underlying Schwann cells. They become activated during development to form intercalary neuromasts. However, no studies have described if INCs can participate in a regenerative event, for example, after the total loss of a neuromast. RESULTS We used electroablation in transgenic larvae expressing fluorescent proteins in PLL components to completely ablate single neuromasts in larvae and adult fish. This injury results in discontinuity of the INCs, Schwann cells, and the PLL nerve. In vivo imaging showed that the INCs fill the gap left after the injury and can regenerate a new neuromast in the injury zone. Further, a single INC is able to divide and form all cell types in a regenerated neuromast and, during this process, it transiently expresses the sox2 gene, a neural progenitor cell marker. We demonstrate a critical role for Schwann cells as negative regulators of INC proliferation and neuromast regeneration, and that this inhibitory property is completely dependent on active ErbB signaling. CONCLUSIONS The potential to regenerate a neuromast after damage requires that progenitor cells (INCs) be temporarily released from an inhibitory signal produced by nearby Schwann cells. This simple yet highly effective two-component niche offers the animal robust mechanisms for organ growth and regeneration, which can be sustained throughout life.
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Affiliation(s)
- Mario Sánchez
- FONDAP Center for Genome Regulation, Facultad de Ciencias, Universidad de Chile, Casilla 653, Las Palmeras 3425, Santiago, Chile
| | - Maria Laura Ceci
- FONDAP Center for Genome Regulation, Facultad de Ciencias, Universidad de Chile, Casilla 653, Las Palmeras 3425, Santiago, Chile
| | - Daniela Gutiérrez
- FONDAP Center for Genome Regulation, Facultad de Ciencias, Universidad de Chile, Casilla 653, Las Palmeras 3425, Santiago, Chile
| | - Consuelo Anguita-Salinas
- FONDAP Center for Genome Regulation, Facultad de Ciencias, Universidad de Chile, Casilla 653, Las Palmeras 3425, Santiago, Chile
| | - Miguel L Allende
- FONDAP Center for Genome Regulation, Facultad de Ciencias, Universidad de Chile, Casilla 653, Las Palmeras 3425, Santiago, Chile.
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12
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Gutiérrez D, Bernès S, Hernández G, Portillo O, Moreno GE, Sharma M, Sharma P, Gutiérrez R. New chiral α-ketoimine-Pd(II) complexes and their anticancer activity. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1084618] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Daniela Gutiérrez
- Lab. Síntesis de Complejos. Fac. Ciencias Químicas, Universidad Autónoma de Puebla, Puebla, Mexico
| | - Sylvain Bernès
- Instituto de Física Luis Rivera Terrazas, BUAP, Puebla, Mexico
| | - Guadalupe Hernández
- Lab. Síntesis de Complejos. Fac. Ciencias Químicas, Universidad Autónoma de Puebla, Puebla, Mexico
| | - Oscar Portillo
- Lab. Síntesis de Complejos. Fac. Ciencias Químicas, Universidad Autónoma de Puebla, Puebla, Mexico
| | - Gloria E. Moreno
- Lab. Síntesis de Complejos. Fac. Ciencias Químicas, Universidad Autónoma de Puebla, Puebla, Mexico
| | - Manju Sharma
- Ingeniería Bioquímica, Instituto Tecnológico Superior de Atlixco, Atlixco, Mexico
| | - Pankaj Sharma
- Instituto de Química-UNAM, Circuito exterior, Cd. Universitaria, Coyoacán, México, DF, Mexico
| | - René Gutiérrez
- Lab. Síntesis de Complejos. Fac. Ciencias Químicas, Universidad Autónoma de Puebla, Puebla, Mexico
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13
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Salgado-Ruiz TB, Rodríguez A, Gutiérrez D, Martínez B, García P, Espinoza-Ortega A, Martínez-Campos AR, Lagunas-Bernabé S, Vicente F, Arriaga-Jordán CM. Molecular characterization and antimicrobial susceptibility of Staphylococcus aureus from small-scale dairy systems in the highlands of Central México. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s13594-014-0195-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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14
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Radaelli G, Petti D, Plekhanov E, Fina I, Torelli P, Salles BR, Cantoni M, Rinaldi C, Gutiérrez D, Panaccione G, Varela M, Picozzi S, Fontcuberta J, Bertacco R. Electric control of magnetism at the Fe/BaTiO₃ interface. Nat Commun 2014; 5:3404. [PMID: 24584546 PMCID: PMC3942656 DOI: 10.1038/ncomms4404] [Citation(s) in RCA: 160] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Accepted: 02/07/2014] [Indexed: 11/30/2022] Open
Abstract
Interfacial magnetoelectric coupling is a viable path to achieve electrical writing of magnetic information in spintronic devices. For the prototypical Fe/BaTiO3 system, only tiny changes of the interfacial Fe magnetic moment upon reversal of the BaTiO3 dielectric polarization have been predicted so far. Here, by using X-ray magnetic circular dichroism in combination with high resolution electron microscopy and first principles calculations, we report on an undisclosed physical mechanism for interfacial magnetoelectric coupling in the Fe/BaTiO3 system. At this interface, an ultrathin oxidized iron layer exists, whose magnetization can be electrically and reversibly switched on-off at room-temperature by reversing the BaTiO3 polarization. The suppression / recovery of interfacial ferromagnetism results from the asymmetric effect that ionic displacements in BaTiO3 produces on the exchange coupling constants in the interfacial oxidized Fe layer. The observed giant magnetoelectric response holds potential for optimizing interfacial magnetoelectric coupling in view of efficient, low-power spintronic devices.
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Affiliation(s)
- G Radaelli
- LNESS-Dipartimento di Fisica-Politecnico di Milano, Via Anzani 42, 22100 Como, Italy
| | - D Petti
- LNESS-Dipartimento di Fisica-Politecnico di Milano, Via Anzani 42, 22100 Como, Italy
| | - E Plekhanov
- Consiglio Nazionale delle Ricerche, CNR-SPIN, 67100 L'Aquila, Italy
| | - I Fina
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Catalonia, Spain
| | - P Torelli
- Consiglio Nazionale delle Ricerche, CNR - IOM, Laboratorio TASC, I-34149 Trieste, Italy
| | - B R Salles
- 1] Consiglio Nazionale delle Ricerche, CNR - IOM, Laboratorio TASC, I-34149 Trieste, Italy [2] Instituto de Fisica, Universidade Federal do Rio de Janeiro, 21941-972 Rio de Janeiro, Brazil
| | - M Cantoni
- LNESS-Dipartimento di Fisica-Politecnico di Milano, Via Anzani 42, 22100 Como, Italy
| | - C Rinaldi
- LNESS-Dipartimento di Fisica-Politecnico di Milano, Via Anzani 42, 22100 Como, Italy
| | - D Gutiérrez
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Catalonia, Spain
| | - G Panaccione
- Consiglio Nazionale delle Ricerche, CNR - IOM, Laboratorio TASC, I-34149 Trieste, Italy
| | - M Varela
- 1] Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA [2] Departamento Fisica Aplicada III, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - S Picozzi
- Consiglio Nazionale delle Ricerche, CNR-SPIN, 67100 L'Aquila, Italy
| | - J Fontcuberta
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus UAB, 08193 Bellaterra, Catalonia, Spain
| | - R Bertacco
- LNESS-Dipartimento di Fisica-Politecnico di Milano, Via Anzani 42, 22100 Como, Italy
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15
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González P, Dussaillant G, Gutiérrez D, Berrocal I, Alay R, Otárola S. [Single-photon emission computed tomography for the assessment of ventricular perfusion and function]. Rev Med Chil 2014; 141:1136-42. [PMID: 24522416 DOI: 10.4067/s0034-98872013000900005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2012] [Accepted: 06/25/2013] [Indexed: 11/17/2022]
Abstract
BACKGROUND Single-photon emission computed tomography (SPECT) can be used as a non-invasive tool for the assessment of coronary perfusion. AIM To assess ventricular perfusion and function by SPECT in patients with single vessel coronary artery disease. MATERIAL AND METHODS Among patients with indications for a coronary artery angiography, those with significant lesions in one vessel, were selected for the study. Within 24 hours, cardiac SPECT examinations on basal conditions and after high doses of dipyridamole, were performed. SPECT data from 38 patients with a low probability of coronary artery disease was used for comparisons. RESULTS Ten patients aged 61 ± 8 years (seven men) were studied. Visual analysis of SPECT revealed signs suggestive of ischemia in eight patients. The remaining two patients did not have perfusion disturbances. SPECT detected eight of ten abnormal vessels reported in the coronary artery angiography. There were two false negative results Summed stress, summed rest and summed difference scores were 9.78 ± 6.51, 3.22 ± 5.07 and 6.33 ± 4.97, respectively. The ejection fractions under stress and at rest were 53 ± 11.7% and 61 ± 15.7% respectively (p < 0.01). The figures for the control group were 69.1 ± 13.5% and 75.2 ± 12.04% respectively (significantly different from patients). Two patients had a summed motion score above 14.9. Likewise, two patients had a summed thickening score above 10.9. CONCLUSIONS SPECT detected 80% of coronary lesions found during coronary artery angiography. Visual analysis of perfusion is highly reliable for diagnosis. Quantitative parameters must be considered only as reference parameters.
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16
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Puertas EB, Arósquipa C, Gutiérrez D. Factors that influence a career choice in primary care among medical students from high-, middle-, and low-income countries: a systematic review. Rev Panam Salud Publica 2013; 34:351-358. [PMID: 24553763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2013] [Accepted: 12/06/2013] [Indexed: 06/03/2023] Open
Abstract
OBJECTIVE To determine which factors influence a medical student's decision to choose a career in primary care; and to establish if these factors are similar or different among students in high-, middle- and low-income countries. METHODS An extensive search was done of PubMed, Google Scholar, and Virtual Library of Health for articles on primary care careers published in 2003-2013 in English, Spanish, and/or Portuguese. Initially, 600 records were identified; 74 full-text articles were assessed for eligibility and 55 were selected (42 from high-income countries; 13 from middle- and low-income). These were assessed to identify intrinsic and extrinsic factors that influence career choice among medical students from high-, middle-, and low-income countries. RESULTS A comparison framework with common and specific factors that influence career choice in primary care among medical students from high-, middle- and low-income was developed. Factors were classified as extrinsic or intrinsic, and as facilitators or barriers. Several factors common to all countries were identified: facilitators were exposure to rural location, role models, working conditions; barriers were low income, prestige, and medical school environment. Some factors specific to middle- and low-income countries were: understanding of rural needs and intellectual challenge. Other factors specific to high-income countries were: attitude towards social problems, voluntary work, influence of family, and length of residency. CONCLUSIONS Further studies on the subject are needed, especially in low- and middle-income countries. Identifying factors as barriers or facilitators for career choice will promote a better understanding of the reasons behind the shortage of primary care professionals and will contribute to policy building, improved training, and recruitment and retention of these professionals.
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17
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Castillo G, Rossano-García A, Gutiérrez D, Diliz-Pérez HS, Córdova J. [Acute cellular rejection in a liver transplantation patient due to changing the brand of a generic immunosuppressant]. Rev Gastroenterol Mex 2013; 78:198-200. [PMID: 23866966 DOI: 10.1016/j.rgmx.2013.01.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Revised: 01/15/2013] [Accepted: 01/28/2013] [Indexed: 10/26/2022]
Affiliation(s)
- G Castillo
- Servicio de Gastroenterología, Hospital General de México «Dr. Eduardo Liceaga» O.D, México DF, México
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18
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Donoso G, Lagos E, Rosati P, Hevia P, Cuevas K, Lobo G, Pérez A, Jiménez C, Gutiérrez D. [Evolution of scintigraphic renal lesions in children after an episode of acute pyelonephritis]. Rev Med Chil 2013; 140:746-50. [PMID: 23282612 DOI: 10.4067/s0034-98872012000600008] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2011] [Accepted: 01/17/2012] [Indexed: 11/17/2022]
Abstract
BACKGROUND Abnormal Dimercaptosuccinic acid (DMSA) renal scintigraphy performed six months after an acute pyelonephritis (AP) is generally interpreted as scarring. AIM To perform a follow up of childhood patients showing scintigraphic renal lesions during the acute phase of pyelonephritis (within 7 days from the beginning of fever). MATERIAL AND METHODS A scintigraphic control was carried out at 5-7 months and, in case of persistent lesions, an additional late scintigraphy at 10-13 months. All patients were followed clinically for one year and those with a relapse of urinary tract infection were excluded from the study. RESULTS Eighty five patients with a median age of 8 months were included. Among these, the first scintigraphic control was normal in 59 (69%) and abnormal in 26 patients (31%). In five of these 26 patients (5/26:19%-5/85: 6%), a considerable regression of the lesions was obvious on the early control, and normalized completely on the late control. When expressing the results in kidney units, 107 showed lesions during the acute phase of infection; 69% was normal at the early control. Thirty three showed lesions persisting at the early control (31%) and 7 out of these 33 (21%) became normal on the late control (7/107: 7%). In total, 25% of the children included in the study (24% of the kidney units) remained with renal sequelae one year after the initial episode of AP. CONCLUSIONS The persistence of scintigraphic lesions six months after an episode of AP, does not necessarily correspond to permanent scars, since normalization can sometimes be observed on late controls.
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Affiliation(s)
- Gilda Donoso
- Servicio de Medicina Nuclear, Hospital San Juan de Dios, Chile.
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19
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Gutiérrez D, Salazar-Varas R. EEG signal classification using time-varying autoregressive models and common spatial patterns. Annu Int Conf IEEE Eng Med Biol Soc 2012; 2011:6585-8. [PMID: 22255848 DOI: 10.1109/iembs.2011.6091624] [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] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
The performance of EEG signal classification methods based on Common Spatial Patterns (CSP) depends on the operational frequency bands of the events to be discriminated. This problem has been recently addressed by using a sub-band decomposition of the EEG signals through filter banks. Even though this approach has proven effective, the performance still depends on the number of filters that are stacked and the criteria used to determine their cutoff frequencies. Therefore, we propose an alternative approach based on an eigenstructure decomposition of the signals' time-varying autoregressive (TVAR) models. The eigen-based decomposition of the TVAR representation allows for subject-specific estimation of the principal time-varying frequencies, then such principal eigencomponents can be used in the traditional CSP-based classification. A series of simulations show that the proposed classification scheme can achieve high classification rates under realistic conditions, such as low signal-to-noise ratio (SNR), a reduced number of training experiments, and a reduced number of sensors used in the measurements.
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Affiliation(s)
- D Gutiérrez
- Center of Research and Advanced Studies, Cinvestav, Monterrey, 66600 Apodaca, Mexico.
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20
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Paris C, Yates L, Lama P, Zepeda AJ, Gutiérrez D, Palma J. Evaluation of metabolic syndrome after hematopoietic stem cell transplantation in children and adolescents. Pediatr Blood Cancer 2012; 59:306-10. [PMID: 22302361 DOI: 10.1002/pbc.24104] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2011] [Accepted: 01/12/2012] [Indexed: 01/19/2023]
Abstract
BACKGROUND To determine the prevalence, characteristics, and risk factors associated with metabolic syndrome (MS) in patients undergoing hematopoietic stem cell transplantation (HSCT) in the Chilean National Program. PROCEDURES Descriptive and cross-sectional study including 69 patients was conducted. Body mass index, pubertal development, waist circumference, arterial pressure (AP), and triglycerides, HDL-cholesterol, and glucose levels were recorded at the time of study entry. The National Cholesterol Education Program (Adult Treatment Panel III, as modified by the American Heart Association) criteria are often used to diagnose MS in adults; however, for children and adolescents we followed criteria according to De Ferranti and American Diabetes Association. Statistical analyses were performed with a chi-square test or Fisher's exact test according to sample size. RESULTS Sixty-nine patients were studied. The median age at the time of diagnosis was 12.9 years, and the median time of follow-up post-transplant was 4 years. Forty-three patients were males, 54 patients had malignant diseases, and 59 patients received allogeneic transplants. Of the 69 patients, 32% had MS; the most common MS features were abdominal obesity (73%), hypertriglyceridemia (91%), and a low HDL-cholesterol level (96%). The most significant risk factor for MS was corticosteroid therapy use pre- (P < 0.03) and post-HSCT (P < 0.03), obesity and overweight associated with MS (P < 0.001). No patient developed cardiovascular complications. CONCLUSIONS The prevalence of MS was 32%, which was significantly higher than in a healthy pediatric population. We recommend prolonged follow-up for transplant recipients, coupled with enforcement of preventive measures, such as early diagnosis and encouragement of a healthy lifestyle.
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Affiliation(s)
- Claudia Paris
- Stem Cell Transplant Unit, Hospital Luis Calvo Mackenna, Santiago, Chile.
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21
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Jiménez-Martí E, Zuzuarregui A, Gomar-Alba M, Gutiérrez D, Gil C, del Olmo M. Molecular response of Saccharomyces cerevisiae wine and laboratory strains to high sugar stress conditions. Int J Food Microbiol 2011; 145:211-20. [PMID: 21247650 DOI: 10.1016/j.ijfoodmicro.2010.12.023] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2010] [Revised: 12/20/2010] [Accepted: 12/21/2010] [Indexed: 11/30/2022]
Abstract
One of the stress conditions that can affect Saccharomyces cerevisiae cells during their growth is osmotic stress. Under particular environments (for instance, during the production of alcoholic beverages) yeasts have to cope with osmotic stress caused by high sugar concentrations. Although the molecular changes and pathways involved in the response to saline or sorbitol stress are widely understood, less is known about how cells respond to high sugar concentrations. In this work we present a comprehensive study of the response to this form of stress which indicates important transcriptomic changes, especially in terms of the genes involved in both stress response and respiration, and the implication of the HOG pathway. We also describe several genes of an unknown function which are more highly expressed under 20% (w/v) glucose than under 2% (w/v) glucose. In this work we focus on the YHR087w (RTC3) gene and its encoded protein. Proteomic analysis of the mutant deletion strain reveals lower levels of several yeast Hsp proteins, which establishes a link between this protein and the response to several forms of stress. The relevance of YHR087W for the response to high sugar and other stress conditions and the relationship of the encoded protein with several Hsp proteins suggest applications of this gene in biotechnological processes in which response to stress is important.
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Affiliation(s)
- E Jiménez-Martí
- Departament de Bioquímica i Biologia Molecular, Facultat de Ciències Biològiques, Universitat de València, Burjassot Valencia, Spain
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22
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Pérez P, Rabnecz G, Laufer Z, Gutiérrez D, Tuba Z, Martínez-Carrasco R. Restoration of photosystem II photochemistry and carbon assimilation and related changes in chlorophyll and protein contents during the rehydration of desiccated Xerophyta scabrida leaves. J Exp Bot 2011; 62:895-905. [PMID: 20956360 PMCID: PMC3022389 DOI: 10.1093/jxb/erq317] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2010] [Revised: 09/17/2010] [Accepted: 09/21/2010] [Indexed: 05/07/2023]
Abstract
Recovery of photosynthesis in rehydrating desiccated leaves of the poikilochlorophyllous desiccation-tolerant plant Xerophyta scabrida was investigated. Detached leaves were remoistened under 12 h light/dark cycles for 96 h. Water, chlorophyll (Chl), and protein contents, Chl fluorescence, photosynthesis-CO(2) concentration response, and the amount and activity of Rubisco were measured at intervals during the rehydration period. Leaf relative water contents reached 87% in 12 h and full turgor in 96 h. Chl synthesis was slower before than after 24 h, and Chla:Chlb ratios changed from 0.13 to 2.6 in 48 h. The maximum quantum efficiency recovered faster during rehydration than the photosystem II operating efficiency and the efficiency factor, which is known to depend mainly on the use of the electron transport chain products. From 24 h to 96 h of rehydration, net carbon fixation was Rubisco limited, rather than electron transport limited. Total Rubisco activity increased during rehydration more than the Rubisco protein content. Desiccated leaves contained, in a close to functional state, more than half the amount of the Rubisco protein present in rehydrated leaves. The results suggest that in X. scabrida leaves Rubisco adopts a special, protective conformation and recovers its activity during rehydration through modifications in redox status.
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Affiliation(s)
- P Pérez
- Institute of Natural Resources and Agrobiology of Salamanca, CSIC, Apartado 257, 37071 Salamanca, Spain.
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23
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Escalona-Vargas DI, Gutiérrez D, Lopez-Arevalo I. Cramér-Rao bounds on the performance of simulated annealing and genetic algorithms in EEG source localization. Annu Int Conf IEEE Eng Med Biol Soc 2011; 2011:7115-7118. [PMID: 22255978 DOI: 10.1109/iembs.2011.6091798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In this paper, we evaluate the performance of simulated annealing (SA) and the genetic algorithm (GA) when used for electroencephalographic (EEG) source localization. The performance is evaluated on the variance of the estimated localizations as a function of the optimization's initialization parameters and the signal-to-noise ratio (SNR). We use the concentrated likelihood function (CLF) as objective function and the Cramér-Rao bound (CRB) as a reference on the performance. The CRB sets the lower limit on the variance of our estimated values. Then, our simulations on realistic EEG data show that both SA and GA are highly sensitive to noise, but adjustments on their parameters for a fixed SNR value do not improve performance significantly. Our results also confirm that SA is more sensitive to noise and its performance may be affected by correlated sources.
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Affiliation(s)
- D I Escalona-Vargas
- Center of Research and Advanced Studies, Cinvestav at Tamaulipas, 87130 Cd Victoria, Mexico.
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24
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Gutiérrez D, Foncubierta A, Espinosa R, Astorga S, Leon A, Fernández S. Immediate type 1 hypersensitivity to apomorphine: a case report. J Investig Allergol Clin Immunol 2011; 21:325-326. [PMID: 21721386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Affiliation(s)
- D Gutiérrez
- UGC Neumología-Alergia, Hospital Universitario Puerta del Mar, Cádiz, Spain.
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25
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Jaimovich R, Gutiérrez D, Lavados H, Aqueveque C, Quevedo L, Alay R, Massardo T. Influence of extracardiac activity and perfusion abnormalities on myocardial perfusion gated SPECT parameters: interobserver analysis. ACTA ACUST UNITED AC 2010; 29:293-8. [PMID: 20570016 DOI: 10.1016/j.remn.2010.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2010] [Revised: 04/01/2010] [Accepted: 04/09/2010] [Indexed: 10/19/2022]
Abstract
OBJECTIVE Extracardiac activity (ECA) may affect interpretation of gated SPECT myocardial perfusion studies (MPSs). To solve this problem, available softwares include myocardial edge delimitation. PURPOSE To evaluate the influence of ECA in automatic myocardial edge detection under normal conditions and with abnormal perfusion and also evaluate the reproducibility of semi-automatic processing. METHODS A total of 100 MPSs, 50 with ECA, were analyzed. Each subgroup included 25 cases with perfusion abnormalities. The cases were processed automatically and by 4 independent operators with different levels of experience. Commercial QGS and QPS softwares were used with tools to mask and relocate the left ventricle area. Functional parameters (final diastolic and systolic volumes and ejection fraction) and perfusion parameters such as the reversibility perfusion score and rest perfusion defect extension were analyzed. The data were compared with Pearson's correlation and Student's test. RESULTS Interobserver correlation significantly worsened with the presence of ECA and was moderately affected by perfusion abnormalities. More experienced observers presented better correlation. Reproducibility was greater for the functional perfusion parameters, independently of the observer's experience. CONCLUSIONS ECA significantly affects automatic edging delimitation, affecting the MPS values. Interobserver reproducibility with manual processing was more altered regarding functional parameters than in the perfusion scores. Perfusion abnormalities did not interfere with software reproducibility, and when present, better correlation was found. If ECA is not present, manual intervention should be avoided.
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Affiliation(s)
- R Jaimovich
- Nuclear Medicine Section, Medicine Department, University of Chile, Clinical Hospital, Santos Dumont 999-1E, Independencia, Santiago, Chile.
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Martínez-Gomariz M, Hernáez ML, Gutiérrez D, Ximénez-Embún P, Préstamo G. Proteomic analysis by two-dimensional differential gel electrophoresis (2D DIGE) of a high-pressure effect in Bacillus cereus. J Agric Food Chem 2009; 57:3543-3549. [PMID: 19338277 DOI: 10.1021/jf803272a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
High hydrostatic pressure (HHP) is a new method used to reduce or eliminate microorganisms that are present in food. Proteins are known to be the most important target of high pressure in living organisms. The main goal of this investigation was focused on the changes that occur on the proteins of Bacillus cereus under HHP stress conditions. The two-dimensional differential gel electrophoresis (2D DIGE) technique allows for a simultaneous resolution of thousands of proteins based on fluorescent prelabeling of the samples with spectrally resolvable fluorescent CyDyes. The results of proteomics profiling show an average of 1300 spots being detected. The analysis revealed 75 spot proteins whose abundance is modified after the application of high pressure, of which 66 were decreased after the HHP treatment. Among them, flagellin was the protein that changed the most. The differential expression of some proteins after HHP treatment at 700 MPa may suggest a reduction of virulence and protective response against oxidative stress in flagellated Bacillus .
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Affiliation(s)
- M Martínez-Gomariz
- Proteomic Facility, Universidad Complutense de Madrid-Parque Científico de Madrid (UCM-PCM), Madrid 28040, Spain
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Palao JM, Gutiérrez D, Frideres JE. Height, weight, Body Mass Index, and age in beach volleyball players in relation to level and position. J Sports Med Phys Fitness 2008; 48:466-471. [PMID: 18997649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
AIM This study tried to find out the height, weight, Body Mass Index (BMI), and age of peak performance beach volleyball players with regard to their level of play and their role. METHODS The men's and women's pairs that classified in the World Tour and in the Olympic Games during seasons 2000-2006 were analyzed (625 males and 617 females). A descriptive, correlational, and longitudinal design was used. The variables studied were: height, weight, age, BMI, level (World Tour ranking), and player role (blocker, defense specialist, or no specialization). The data were obtained from the webpage of the International Federation of Volleyball. RESULTS The average characteristics for males were 1.93 m, 88-89 kg, a BMI of 23.8-24.1, and an age range of 29-31 years, and for females, they were 1.77-1.79 m, 66-68 kg, a BMI of 19.2-21.1, and an age range of 27-29 years. CONCLUSION Beach volleyball players are older and have smaller anthropometric characteristics when compared to indoor volleyball players. Male players present similar values for age and height across rankings. For both genders, with regard to weight and BMI, the higher the level, the larger the value. For women, the players at a higher level presented higher values of age, height, weight, and BMI. With regard to role, the blocking specialists were taller than the defense specialists. The pairs that share the blocking and defense responsibilities have intermediate values.
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Affiliation(s)
- J M Palao
- Department of Physical Activity and Sport Sciences, Faculty of Health, Physical Activity and Sport, Catholic University of St. Anthony. Guadalupe, Murcia, Spain.
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Massardo T, Jaimovich R, Lavados H, Gutiérrez D, Rodríguez JC, Saavedra JM, Alay R, Gatica H. Comparison of radionuclide ventriculography using SPECT and planar techniques in different cardiac conditions. Eur J Nucl Med Mol Imaging 2007; 34:1735-46. [PMID: 17579852 DOI: 10.1007/s00259-007-0472-8] [Citation(s) in RCA: 12] [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] [Received: 12/13/2006] [Accepted: 04/02/2007] [Indexed: 10/23/2022]
Abstract
PURPOSE Accurate assessment of ventricular function is required to optimize therapeutic management of cardiac diseases. The aim of this study was to correlate planar equilibrium multigated acquisition (MUGA) with tomographic ventriculography (SPECT) in patients with diverse volumes and wall motion abnormalities. METHODS Eighty-three studies in 80 patients (56+/-14 years; 56% women) were classified according to ventricular dilation, wall motion abnormalities and systolic dysfunction. Left and right ventricular ejection fraction (LVEF and RVEF) and end-diastolic and end-systolic left ventricular volumes (EDV and ESV) were obtained using a commercial QBS program for SPECT. On planar acquisition, LVEF and RVEF were obtained using standard techniques and volumes were determined using the count-based method, without blood sampling. RESULTS A. Total group: With the planar method, LVEF was 44+/-17%, RVEF 42+/-13%, left EDV 147+/-97 ml (range 31-487 ml) and left ESV 93+/-85 ml (range 15-423 ml); with SPECT the corresponding values were 40+/-20%, 49+/-16%,131+/-95 ml and 91+/-89 ml, respectively (p=NS for all but RVEF). Linear correlation was 0.845 for LVEF, 0.688 for RVEF, 0.927 for left EDV and 0.94 for left ESV, with good intra-class correlation. B. Subgroups: Global and intra-class correlations between planar imaging and SPECT were high for volumes, RVEF and LVEF in all subgroups, except in patients with normal wall motion and function, who showed smaller volumes with SPECT. The group with diffuse wall motion abnormalities had a lower EDV on SPECT. In the abnormal left ventricle, RVEF was higher with SPECT. CONCLUSION Good correlation and agreement exist between SPECT and planar MUGA with respect to LVEF and left ventricular volumes. SPECT is useful in patients with functional abnormalities, but less reliable in those with normal small cavities. A combined technique is still necessary, and RVEF should be interpreted cautiously.
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Affiliation(s)
- Teresa Massardo
- Medicine Department, Nuclear Medicine Section, University of Chile - Clinical Hospital, Santos Dumont 999-1E, Independencia, Santiago, Chile.
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29
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Cowley MJR, Thomas CD, Wilson RJ, León-Cortés JL, Gutiérrez D, Bulman CR. Density-distribution relationships in British butterflies. II. An assessment of mechanisms. J Anim Ecol 2002. [DOI: 10.1046/j.1365-2656.2001.00509.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Cowley MJR, Thomas CD, Roy DB, Wilson RJ, León-Cortés JL, Gutiérrez D, Bulman CR, Quinn RM, Moss D, Gaston KJ. Density-distribution relationships in British butterflies. I. The effect of mobility and spatial scale. J Anim Ecol 2002. [DOI: 10.1046/j.1365-2656.2001.00508.x] [Citation(s) in RCA: 139] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Gil D, Gutiérrez D, Alarcón B. Intracellular redistribution of nucleolin upon interaction with the CD3epsilon chain of the T cell receptor complex. J Biol Chem 2001; 276:11174-9. [PMID: 11115514 DOI: 10.1074/jbc.m010114200] [Citation(s) in RCA: 15] [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: 11/06/2022] Open
Abstract
T cell activation through the antigen receptor (TCR) involves the cytoplasmic tails of the CD3 subunits CD3gamma, CD3delta, CD3epsilon, and CD3zeta. Whereas the biological significance of the cytoplasmic tails of these molecules is suggested, in part, by their evolutionarily conserved sequences, their interactions with signal transduction molecules are not completely understood. We used affinity chromatography columns of glutathione S-transferase fused to the CD3epsilon cytoplasmic tail to isolate proteins that specifically interact with this subunit. In this way, we identified the shuttling protein nucleolin as a specific CD3epsilon-interacting molecule. Using competition studies and affinity chromatography on peptide columns, we were able to identify a central proline-rich sequence as the nucleolin-interacting sequence in CD3epsilon. Transfection in COS cells of wild type CD3epsilon, but not of nonbinding mutants of CD3epsilon, resulted in redistribution of nucleolin from the nucleus and nucleoli to the cytoplasm. This property was transferred to a CD8 protein chimera by appending the cytoplasmic tail of CD3epsilon. We also found that nucleolin associated with the TCR complex. This association was increased upon TCR engagement, suggesting that the CD3epsilon/nucleolin interaction may have a role in T cell activation.
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Affiliation(s)
- D Gil
- Centro de Biologia Molecular Severo Ochoa, Consejo Superior de Investigaciones Cientificas, Universidad Autónoma de Madrid, Cantoblanco, Madrid 28049, Spain
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Colombo MV, Gutiérrez D, Palacios JM, Imperial J, Ruiz-Argüeso T. A novel autoregulation mechanism of fnrN expression in Rhizobium leguminosarum bv viciae. Mol Microbiol 2000; 36:477-86. [PMID: 10792733 DOI: 10.1046/j.1365-2958.2000.01867.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The fnrN gene from Rhizobium leguminosarum UPM791 controls microaerobic expression of both nitrogen fixation and hydrogenase activities in symbiotic cells. Two copies of fnrN are present in this strain, one chromosomal (fnrN1) and the other located in the symbiotic plasmid (fnrN2). Their expression was studied by cloning the regulatory regions in lacZ promoter-probe vectors. The fnrN genes were found to be autoregulated: they are expressed only at basal levels under aerobic conditions; they are highly expressed under microaerobic conditions; and they are expressed at basal levels in the double mutant DG2 (fnrN1 fnrN2) under any condition. The promoters of both genes contain two FnrN-binding sequences (anaeroboxes), centred at positions -12.5 (proximal anaerobox) and -44.5 (distal anaerobox). Expression analysis and gel retardation experiments with fnrN1-derivative promoter mutants altered in key bases of the anaerobox sequences demonstrated that binding of FnrN1 to the distal anaerobox is necessary for microaerobic activation of transcription, and that binding of FnrN1 to the proximal anaerobox results in transcriptional repression. The apparent affinity of FnrN1 for the proximal anaerobox was fivefold lower than for the distal anaerobox, resulting in repression of transcription of fnrN1 only at high-FnrN1 concentrations. This positive and negative autoregulation mechanism ensures an equilibrated expression of fnrN in response to microaerobic conditions.
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Affiliation(s)
- M V Colombo
- Laboratorio de Microbiología, E.T.S. Ingenieros Agrónomos, Universidad Politécnica de Madrid, Ciudad Universitaria, s/n, 28040 Madrid, Spain
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Aguila A, Nazer J, Cifuentes L, Mella P, de la Barra P, Gutiérrez D. [Prevalence of congenital malformations at birth and associated factors in Easter Island, Chile (1988-1998)]. Rev Med Chil 2000; 128:162-6. [PMID: 10962884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
BACKGROUND Consanguinity plays an important role in the genetic etiology of congenital malformations. In Easter Island the degree of consanguinity could be higher than in continental Chile. Therefore the study of the prevalence of congenital malformations in this island seems worthwhile. AIM To study the prevalence of congenital malformations at birth in Easter Island. MATERIAL AND METHODS A review of personal and family features of all children born alive between 1988 and 1998 in the Rapa Nui Hospital of Easter Island. RESULTS During the study period, 772 newborns were reviewed and 22 were found to have congenital malformations. Among the latter, birth weight fluctuated between 3001 and 4000 g and the male/female ratio was 0.54. No differences in maternal age between children with and without malformations was observed. Heart and circulatory malformations, hemangiomas and Down syndrome were the predominant malformations. CONCLUSIONS The prevalence of congenital malformations at birth in Easter Island is similar to that of continental Chile. No neural tube defects were detected in this sample.
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Affiliation(s)
- A Aguila
- Departamento de Obstetricia y Ginecología, Universidad de Chile.
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Affiliation(s)
- D Gutiérrez
- Baby Friendly Hospital Initiative, UNICEF, New York, USA
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35
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Gutiérrez D, Hernando Y, Palacios JM, Imperial J, Ruiz-Argüeso T. FnrN controls symbiotic nitrogen fixation and hydrogenase activities in Rhizobium leguminosarum biovar viciae UPM791. J Bacteriol 1997; 179:5264-70. [PMID: 9286975 PMCID: PMC179391 DOI: 10.1128/jb.179.17.5264-5270.1997] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Rhizobium leguminosarum bv. viciae UPM791 contains a second copy of the fnrN gene, which encodes a redox-sensitive transcriptional activator functionally homologous to Escherichia coli Fnr. This second copy (fnrN2) is located in the symbiotic plasmid, while fnrN1 is in the chromosome. Isolation and sequencing of the fnrN2 gene revealed that the deduced amino acid sequence of FnrN2 is 87.5% identical to the sequence of FnrN1, including a conserved cysteine-rich motif characteristic of Fnr-like proteins. Individual R. leguminosarum fnrN1 and fnrN2 mutants exhibited a Fix+ phenotype and near wild-type levels of nitrogenase and hydrogenase activities in pea (Pisum sativum L.) nodules. In contrast, an fnrN1 fnrN2 double mutant formed ineffective nodules lacking both nitrogenase and hydrogenase activities. Unlike the wild-type strain and single fnrN1 or fnrN2 mutants, the fnrN1 fnrN2 double mutant was unable to induce micro-oxic or bacteroid activation of the hypBFCDEX operon, which encodes proteins essential for hydrogenase synthesis. In the search for symbiotic genes that could be controlled by FnrN, a fixNOQP operon, putatively encoding a micro-oxically induced, bacteroid-specific cbb3-type terminal cytochrome oxidase, was isolated from strain UPM791 and partially sequenced. The fixNOQP operon was present in a single copy located in the symbiotic plasmid, and an anaerobox was identified in the fixN promoter region. Consistent with this, a fixNOQP'-lacZ fusion was shown to be highly induced in micro-oxic cells of the wild-type strain. A high level of micro-oxic induction was also observed in single fnrN1 and fnrN2 mutants, but no detectable induction was observed in the fnrN1 fnrN2 double mutant. The lack of expression of fixNOQP in the fnrN1 fnrN2 double mutant is likely to cause the observed Fix- phenotype. These data demonstrate that, contrary to the situation in other rhizobia, FnrN controls both hydrogenase and nitrogenase activities of R. leguminosarum bv. viciae UPM791 in the nodule and suggest that this strain lacks a functional fixK gene.
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Affiliation(s)
- D Gutiérrez
- Laboratorio de Microbiología, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Spain
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Gutiérrez D, Guardia P, Delgado J, Gutiérrez J, Monteseirin FJ, de la Calle A, Lobatón P, Senra A, Conde J. Increased serum IgE in acute type A, B and delta hepatitis. J Investig Allergol Clin Immunol 1997; 7:119-21. [PMID: 9161938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Serum IgE levels have been documented in patients of acute type B hepatitis. There are very few studies on serum IgE in acute type A hepatitis and, to our knowledge, there are no data on serum IgE in acute delta hepatitis patients. The purpose of this study was to measure total IgE levels in 38 patients with acute A, B and delta hepatitis and in 181 controls in order to determine the possible existence of changes in this parameter in the course of these infections. Our results showed a relevant increase in IgE levels in the three groups (hepatitis A, B and delta) with respect to the control group. Moreover, the hepatitis B group showed increased total serum IgE levels with respect to the hepatitis delta group.
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Affiliation(s)
- D Gutiérrez
- Servicio Regional de Inmunología y Alergia, Hospital Virgen Macarena, Spain
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Monteseirín J, Prados M, Camacho MJ, Llamas E, de la Calle A, González J, Gutiérrez D, Conde J. Eosinophils and allergy. Allergol Immunopathol (Madr) 1996; 24:201-10. [PMID: 8985476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- J Monteseirín
- Servicio Regional de Inmunología y Alergia, Hospital Universitario Virgen Macarena, Facultad de Medicina, Universidad de Sevilla, Spain
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Monteseirín J, Camacho MJ, Gutiérrez D, Llamas E, Guardia P, Bonilla I, Sánchez-Monteseirín H, Conde J. Neutrophils and allergy. Allergol Immunopathol (Madr) 1996; 24:193-200. [PMID: 8985475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- J Monteseirín
- Servicio Regional de Inmunología y Alergia, Hospital Universitario Virgen Macarena, Facultad
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Sáenz Lope E, Gutiérrez D. [On the 70th anniversary of Professor Lluis Barraquer i Bordas]. Neurologia 1994; 9:257. [PMID: 8086191] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
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Cazzaniga M, Faella H, Laneri D, Sciegata A, Gamboa R, Kurlat I, Mazzuchelli T, Gutiérrez D, Mesz B. [Percutaneous balloon valvotomy in neonatal obstructive cardiopathy. I: critical pulmonary valvular stenosis]. An Esp Pediatr 1993; 38:295-9. [PMID: 8480939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Percutaneous pulmonary balloon valvotomy using one balloon or more in sequential approach was attempted in 9 no selected neonates with critical pulmonary valve stenosis between March 1985 and October 1990 (mean age 10 + 8.6 days). The procedure was successful in seven of them (78%) in whom with a 1.22 + 0.2 balloon/annulus ratio the right ventricular systolic pressure decreased from 96 to 45 mmHg (p < 0.001), the transvalvular gradient from 65 to 23 mmHg (p < 0.001); and the systemic oxygen saturation increased from 69 to 86% (p < 0.001). In one patient the valve was not crossed. Two patients underwent surgery because unsuccessful balloon valvotomy result in the immediate and mid term period: hypoplastic right ventricle in one, and inferior vena cava thrombosis that prevent a second dilation in the other respectively. The mid term follow up showed a 62% (5/8) of successful result. Although the complex methodology and complications are not uncommon, the balloon pulmonary valvotomy is a safely and effective therapy for neonates with critical pulmonary stenosis.
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Affiliation(s)
- M Cazzaniga
- Hospital de Pediatría JP Garrahan, Buenos Aires, Argentina
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