987 resultados para mir-128a


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With this is bound his Grammatische-Kritisches Wörterbuch der deutschen Sprache.

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Photocopy (positive) made by University Microfilms.

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von alt Chorherr und Archidiakon Cramer

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Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

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The roles of long non-coding RNAs (lncRNAs) in regulating cancer and stem cells are being increasingly appreciated. Its diverse mechanisms provide the regulatory network with a bigger repertoire to increase complexity. Here we report a novel LncRNA, Lnc34a, that is enriched in colon cancer stem cells (CCSCs) and initiates asymmetric division by directly targeting the microRNA miR-34a to cause its spatial imbalance. Lnc34a recruits Dnmt3a via PHB2 and HDAC1 to methylate and deacetylate the miR-34a promoter simultaneously, hence epigenetically silencing miR-34a expression independent of its upstream regulator, p53. Lnc34a levels affect CCSC self-renewal and colorectal cancer (CRC) growth in xenograft models. Lnc34a is upregulated in late-stage CRCs, contributing to epigenetic miR-34a silencing and CRC proliferation. The fact that lncRNA targets microRNA highlights the regulatory complexity of non-coding RNAs (ncRNAs), which occupy the bulk of the genome.

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Mémoire numérisé par la Direction des bibliothèques de l'Université de Montréal.

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Objetivo. Analizar la influencia de algunos factores que podrían asociarse con el rendimiento y éxito de los médicos en la prueba MIR. Sujetos y métodos. Se analizaron los resultados obtenidos por los aspirantes médicos en la prueba MIR de la convocatoria 2014-2015 originarios de 29 facultades de medicina. Las variables de análisis incluidas fueron la nota de acceso a la universidad para el curso 2008-2009, el tamaño de las promociones de entrada, el número total de los presentados a la convocatoria MIR, la diferencia entre los presentados a la convocatoria y el tamaño de la promoción de entrada, y las variables de éxito, como el porcentaje de aspirantes que superaron la prueba y su distribución en los percentiles 23 y 73. Resultados. Ni la nota de acceso a la universidad ni el tamaño de la promoción de entrada se asociaron con las variables de éxito en los resultados. La diferencia entre presentados a la prueba y estudiantes de la promoción fue un indicador significativamente negativo del éxito en la prueba. Conclusiones. El principal y único factor determinante del éxito de los resultados en la prueba MIR es la diferencia entre el número de presentados a la prueba y el de los estudiantes de la cohorte inicial. Esta diferencia representa en su mayor parte a aquellos estudiantes que difieren su candidatura a la prueba por no obtener plaza en la convocatoria natural o que prefieren cambiar la obtenida en años anteriores.

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We previously identified heme oxygenase 1 (HO-1) as a specific target of miR-155, and inhibition of HO-1 activity restored the capacity of miR-155-/- CD4+ T cells to promote antigendriven inflammation after adoptive transfer in antigen-expressing recipients. Protoporphyrins are molecules recognized for their modulatory effect on HO-1 expression and function. In the present study, we investigated the effect of protoporphyrin treatment on the development of autoimmunity in miR-155-deficient mice. MiR-155-mediated control of HO-1 expression in promoting T cell-driven chronic autoimmunity was confirmed since HO-1 inhibition restored susceptibility to experimental autoimmune encephalomyelitis (EAE) in miR-155- deficient mice. The increased severity of the disease was accompanied by an enhanced T cell infiltration into the brain. Taken together, these results underline the importance of miR- 155-mediated control of HO-1 expression in regulating the function of chronically-stimulated T cells in EAE.

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Chagas disease, which is caused by the intracellular protozoan Trypanosoma cruzi , is a serious health problem in Latin America. The heart is one of the major organs affected by this parasitic infection. The pathogenesis of tissue remodelling, particularly regarding cardiomyocyte behaviour after parasite infection, and the molecular mechanisms that occur immediately following parasite entry into host cells are not yet completely understood. Previous studies have reported that the establishment of parasitism is connected to the activation of the phosphatidylinositol- 3 kinase (PI3K), which controls important steps in cellular metabolism by regulating the production of the second messenger phosphatidylinositol-3,4,5-trisphosphate. Particularly, the tumour suppressor PTEN is a negative regulator of PI3K signalling. However, mechanistic details of the modulatory activity of PTEN on Chagas disease have not been elucidated. To address this question, H9c2 cells were infected with T. cruzi Berenice 62 strain and the expression of a specific set of microRNAs (miRNAs) were investigated. Our cellular model demonstrated that miRNA-190b is correlated to the decrease of cellular viability rates by negatively modulating PTEN protein expression in T. cruzi-infected cells.

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Purpose: To identify effective molecular diagnostic methods for oral squamous cell carcinoma (OSCC) to facilitate treatment of the disease in its initial stages. Methods: To identify molecular markers, OSCC tissue samples were collected from cancer patients and healthy controls. CD44+ cells were sorted using quantitative real-time polymerase chain reaction (qRT-PCR). Immunohistochemistry and immunostaining experiments were performed to identify markers for OSCC. Results: The qRT-PCR data confirmed the presence of oncogenic miR-155 in the OSCC samples. The immunohistochemical and immunostaining results confirmed the expression of Oct-4, an important target for the early diagnosis of OSCC, in oncogenic miR-155-positive OSCCs. Conclusion: Detection of the expression of miR-155 and Oct-4, which are key molecular markers, may be useful in improving the early diagnosis of OSCC.