检索结果-南通市图书馆

T follicular helper expansion and humoral-mediated rejection are independent of the HVEM/BTLA pathway

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2017年第6期14卷 497-510页

作者： Jose-Ignacio Rodriguez-Barbosa Carlos Fernandez-Renedo ana maria bravo moral Leo Biihler maria-Luisa del Rio Transplantation Immunobiology Section Institute of Biomedicine University of Leon and Castilla and Leon Regional Transplantation Coordination Leon University Hospital Leon Spain Department of Veterinary Clinical Sciences University of Santiago de Compostela Veterinary Faculty Lugo Spain Visceral and Transplantation Surgery Department of Surgery University Hospitals of Geneva and Faculty of Medicine Geneva Switzerland

The molecular pathways contributing to humoral-mediated allograft rejection are poorly defined. In this study, we assessed the role of the herpesvirus entry mediator/B- and T-lymphocyte attenuator （HVEM/BTLA） signalling pathway in the context of antibody-mediated allograft rejection. An experimental setting was designed to elucidate whether the blockade of HVEM/BTLA interactions could modulate de novo induction of host antidonor-specific antibodies during the course of graft rejection. To test this hypothesis, fully allogeneic major histocompatibility complex-mismatched skin grafts were transplanted onto the right flank of recipient mice that were treated with isotype control, anti-CD40L or modulatory antibodies of the HVEM/BTLA signalling pathway. The frequencies of CD4 T follicular helper （Tfh） cells （B220-, CD4＋ CXCR5＋ PD-lhigh）, extrafollicular helper cells （B220-, CD4＋ CXCR5- PD-1＋ and PD-1-） and germinal centre （GC） B cells （B220＋Fas＋ GL7＋） were analysed by flow cytometry in draining and non-draining lymph nodes at day 10 post transplantation during the acute phase of graft rejection. The host antidonor isotype-specific humoral immune response was also assessed. Whereas blockade of the CD40/CD40L pathway was highly effective in preventing the allogeneic humoral immune response, antibody-mediated blockade of the HVEM/BTLA-interacting pathway affected neither the expansion of Tfh cells nor the expansion of GC B cells. Consequently, the course of the host antidonor antibody-mediated response proceeded normally, without detectable evidence of impaired development. In summary, these data indicate that HVEM/BTLA interactions are dispensable for the formation of de novo host antidonor isotype-specific antibodies in transplantation.

关键词： BTLA (CD272) humoral immunity HVEM (TNFRSF14, CD270) T follicular helper cells transplantation

IKKβ overexpression together with a lack of tumour suppressor genes causes ameloblastic odontomas in mice

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Oral Science 2020年第1期12卷 31-39页

作者： Angustias Page ana bravo Cristian Suarez-Cabrera Raquel Sanchez-Baltasar marta Oteo Miguel Angel Morcillo MLlanos Casanova Jose CSegovia Manuel Navarro Angel Ramirez Molecular Oncology Unit.Centro de Investigaciones Energéticas Medioambientales y Tecnológicas(CIEMAT)MadridSpain Instituto de Investigación 12 de Octubre i+12 MadridSpain Centro de Investigación Biomédica en Red de Cáncer(CIBERONC) MadridSpain Department of anatomy Animal Production and Veterinary Clinical SciencesLaboratory of Pathology Phenotyping of Genetically Engineered MiceFaculty of Veterinary MedicineUniversity of Santiago de CompostelaLugoSpain Biomedical Applications and Pharmacokinetics Unit Centro de Investigaciones EnergéticasMedioambientales y Tecnológicas(CIEMAT)MadridSpain Hematopoietic Innovative Therapies Division.Centro de Investigaciones Energéticas Medioambientales y Tecnológicas(CIEMAT).Centro de Investigación Biomédica en Red de Enfermedades Raras(CIBERER)MadridSpain Unidad Mixta de Terapias Avanzadas Fundación Instituto de Investigaciones Sanitarias Fundación Jiménez DíazMadridSpain

Odontogenic tumours are a heterogeneous group of lesions that develop in the oral cavity region and are characterized by the formation of tumoural structures that differentiate as teeth. Due to the diversity of their histopathological characteristics and clinical behaviour, the classification of these tumours is still under debate. Alterations in morphogenesis pathways such as the Hedgehog,MAPK and WNT/β-catenin pathways are implicated in the formation of odontogenic lesions, but the molecular bases of many of these lesions are still unknown. In this study, we used genetically modified mice to study the role of IKKβ(a fundamental regulator of NF-κB activity and many other proteins) in oral epithelial cells and odontogenic tissues. Transgenic mice overexpressing IKKβ in oral epithelial cells show a significant increase in immune cells in both the oral epithelia and oral submucosa. They also show changes in the expression of several proteins and mi RNAs that are important for cancer development. Interestingly, we found that overactivity of IKKβ in oral epithelia and odontogenic tissues, in conjunction with the loss of tumour suppressor proteins(p53, or p16 and p19), leads to the appearance of odontogenic tumours that can be classified as ameloblastic odontomas, sometimes accompanied by foci of secondary ameloblastic carcinomas. These tumours show NF-κB activation and increased β-catenin *** findings may help to elucidate the molecular determinants of odontogenic tumourigenesis and the role of IKKβ in the homoeostasis and tumoural transformation of oral and odontogenic epithelia.

关键词： IKKβ tumour suppressor

Strategies for Higher Education in a Global Context

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Economics World 2018年第5期6卷 370-383页

作者： ana Bela bravo António Joaquim Serralheiro Portuguese Military Academy Lisbon Portugal Research Center of the Military Academy Lisbon Portugal Center for Spatial and Organizational Dynamics of the Algarve University Algarve Portugal Portuguese Military Academy Lisbon Portugal Research Center of the Military Academy Lisbon PortugalINESC-ID Lisbon Portugal

The growth of internationalization of higher education, both in developed and in emergent countries is a result ofglobalization. In spite of the growing literature on higher education, results from the process of internationalization,its benefits and risks, have not been widely discussed. Studies of different internationalization strategies andcomparative analysis are also scarce. This paper contributes, on the one hand, towards, a reflexion on those topicsby reviewing literature on the evolution of strategies and suggesting guidelines for a national strategy for HigherEducation （HE）; on the other hand, by analysing recent data, compares the scope of high educationinternationalization among European and other countries. There has been an evolution from mobility of studentsand staff towards transnationalization of courses and services/products from higher education institution （HEI）.Global surveys point to different approaches to internationalization and different results and perceptions. The viewthat internationalization is a condition for high performance of higher education institutions and nationalcompetitiveness does not appear to be clearly supported by evidence.

关键词： internationalization transnationalization higher education Europe Portugal strategies

Bioinformatics analysis of NprR-NprX Quorum-Sensing System of <i>Bacillus thuringiensis</i>Isolates from the Papaloapan Region, Oaxaca-Mexico

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Biological Chemistry 2015年第7期5卷 293-304页

作者： Humberto Rafael bravo-D Alain Cruz-Nolasco Luis Raúl Gutiérrez-Lucas ana Karin Navarro-Mtz División de Estudios de Posgrado Universidad del Papaloapan Circuito Central 200 Parque Industrial Tuxtepec Oaxaca México Instituto de Biotecnología Universidad del Papaloapan Circuito Central 200 Parque Industrial Tuxtepec Oaxaca México

Quorum sensing is a chemical communication process that bacteria use to regulate collective behaviors. In Gram-positive bacteria, oligopeptides (called autoinducers) are the signaling molecules to elicit quorum sensing. In Bacillus thuringiensis, NprR is a transcriptional regulator whose activity depends on the NprX signalling peptide. Bacillus thuringiensis is closely related to Bacillus cereus and Bacillus anthracis. The principal difference between them is that Bacillus thuringiensis is the only one that produced Cry protein. The aim of this study is to explore the relation of nprR and 16S rRNA genes in Bacillus thurin-giensis. Phylogenetic trees of nucleotide sequences of nprR and 16S rRNA genes were built. Sequences of fourteen new isolates from Papaloapan region were included in those phylo-genetic trees. In order to identify the isolates, a simple and fast methodology considering the Cry protein formation was used. The 16S rRNA phylogenetic tree allows identify eight isolates as Bacillus thuringiensis and the others as Bacillus spp. The nprR phylogenetic tree does not match with the 16S rRNA phylogenetic tree. This confirms that nprR is not a molecular marker for evolution. Most of the new isolates have the same NprR sequence (WTSDIVG). However, the SKPDIVG is the most common NprR sequence in thuringiensis species.

关键词： Quorum-Sensing Bacillus thuringiensis NprR-NprX Phylogenetic Tree

Single Layer Centrifugation with Androcoll-E^(TM) improved progressive motility and percentage of live spermatozoa with intact acrosome of chilled stallion semen but did not have an effect on DNA integrity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Animal Sciences 2012年第3期2卷 159-165页

作者： ana Luisa Costa ana martins-Bessa ana Rebello de Andrade Tiago Guimaraes maria Rosa Rebordao Sandra Gamboa Pedro Pinto bravo maria José Correia Jorge Colaco Isabel Gaivao António Rocha Centro de Ciencia Animal e Veterinária(CECAV) University of Trás-os-Montes e Alto DouroQuinta de PradosVila RealPortugal Veterinary Degree Universty of Tras-os-Montes e Alto DouroQuinta de PradosVila RealPortugal Centro de Estudos em Ciencia Animal(CECA) Instituto de Ciencias Biomedicas Abel Salazar(ICBAS)University of PortoOportoPortugal Coimbra Higher School of Agriculture Sao Martinho do BispoCoimbraPortugal Alter Real Foundation Alter do ChaoPortugal

A significant number of stallions produce low quality ejaculates with high sensibility to chilling. Single Layer Centrifugation (SLC) with Andro-coll-ETM has been presented as an efficient method of selecting good quality spermatozoa. In the current study, changes in sperm quality (motility, viability, acrosome integrity and DNA damage) occurring during storage at 5?C for a maximum of 72 h, were investigated. For that, one ejaculate from 12 stallions was split in two aliquots: control and SLC-selected. Both aliquots were chilled and stored at 5?C and spermatozoa were evaluated for motility, viability and acrosome integrity at 24, 48 and 72 h post collection. DNA damage was evaluated at 48 h post collection using the comet assay. In the SLC-selected aliquots, there was a significant improvement in terms of progressive motility (0 h: P = 0.005;24 h: P 0.05). SLC with Androcoll-ETM improved semen quality prolonging sperm longevity of chilled semen (P = 0.012). This positive effect was more evident in ejaculates most sensitive to chilling that had a sharp decrease in motility in the first 24 h of refrigeration and for all ejaculates at 72 h post-chilling. Therefore, this method reveals to be a useful technique for selecting spermatozoa and maintain sperm quality during storage.

关键词： Stallion Sperm Single Layer Centrifugation Androcoll-ETM Membrane Integrity Comet assay Component Formatting Style Styling

Physiological dormancy broken by endozoochory:Austral parakeets(Enicognathus ferrugineus)as legitimate dispersers of calafate(Berberis microphylla)in the Patagonian Andes

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Plant Ecology 2020年第5期13卷 538-544页

作者： Carolina bravo Daniel Chamorro Fernando Hiraldo Karina Speziale Sergio A.Lambertucci JoséL.Tella Guillermo Blanco Department of Evolutionary Ecology Museo Nacional de Ciencias NaturalesCSICJoséGutiérrez Abascal 228006 MadridSpain Centre d’Etudes Biologiques de Chizé UMR 7372CNRS and La Rochelle UniversitéF-79360 Beauvoir-sur-NiortFrance Departamento de Ciencias Ambientales Universidad de Castilla-La ManchaAv.Carlos III s/n45071 ToledoSpain Department of Conservation Biology Estación Biológica de DoñanaCSICAmérico Vespucio 2641092 SevillaSpain Grupo de Investigaciones en Biología de la Conservación Departamento de EcologíaINIBIOMA(CONICET-National University of Comahue)Pasaje Gutiérrez 11258400 BarilocheArgentina

Aims Seed dispersal by endozoochory is an important process in plant regeneration and the establishment of new *** with dormancy may especially benefit after disperser gut ***,the ways in which gut passage affect the germination of plant species with physiological dormancy remain ***,we experimentally assessed the mutualistic interaction between the Austral parakeet(Enicognathus ferrugineus)as a disperser of calafate(Berberis microphylla),a thorny bush inhabiting the understory of the Austral temperate forests of South America with seeds that are characterized by deep physiological *** Germination success and viability of calafate seeds obtained from faeces and from intact fruits were tested under four treatments:(i)digested seeds,(ii)digested seeds with faecal extract,(iii)intact seeds from fruit and(iv)intact seeds from fruit with *** Findings About 65%of the Austral parakeet droppings contained calafate *** of seeds did not differ between ***,germination was significantly higher in digested seeds than in intact seeds from fruits,while no difference was found between faecal and pulp *** faecal matter nor fruit pulp provided seeds with any ecological advantages derived from enhancing germinability,but did confer some disadvantage in germination *** matter is expected to be completely lacking around seeds after several months under snow before germinating in the following spring,given intense washing due to persistent rain and the spring thaw in the Patagonian *** higher germinability along with faster germination of digested seeds supports the hypothesis of a legitimate mutualistic interaction between Austral parakeets and *** hypothesized that the passage through the disperser digestive tract might break physiological dormancy as differences in germinability between ingested and non-ingested *** results highlight the relevant role of endoz

关键词： seed dispersal Austral forest mutualism gut passage viability germination success germinability

Myasthenia gravis as a form of clinical presentation of thymic carcinoma

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Respirology 2015年第2期5卷 176-179页

作者： Joana Espiga de Macedo Sílvia Lopes Helena Gouveia Sofia Oliveira Joo Cunha ana Luísa Faria Sónia Rego Albino Oliveira Luís Krug Emílio Macias bravo Department of Medical Oncology of Centro Hospitalar de Entre o Douro e Vouga Department of Pathology of Centro Hospitalar de Entre o Douro e Vouga Department of Radiology of Centro Hospitalar de Entre o Douro e Vouga

Thymic carcinomas are rare tumors of the thymus arising in the thymic epithelium. They represent less than 1% of thymic malignancies. They often present with an advanced disease and metastasize to regional lymph nodes and distant sites. They have a worse prognosis with a 5-year survival rate of 30%-50%, while thymomas are much less invasive and have a 5-year survival of approximately 78%. We report a rare form of clinical presentation of a thymic carcinoma in which the diagnosis of myasthenia gravis was the cornerstone of the diagnosis of cancer. Surgery is considered the salvage treatment when possible. Radiotherapy is a second choice of salvage treatment, when possible depending on its localization and relation to nearby structures such as vascular structures. Molecular target therapy is a more directed, more expensive but less toxic treatment. Further studies need to be carried out for its approval worldwide, outside clinical trials.

关键词： Myasthenia gravis Thymic carcinoma Multidisciplinary approach Clinical-molecular signature Prognosis