168 research outputs found

    Orientación a maestros y maestras de educación primaria para tratar problemas y dificultades de aprendizaje en la Escuela Quirina Tassi de Agostini

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    Orientar al maestro sobre las características que presentan los niños con dificultades de aprendizaje, brindándoles técnicas para que puedan contribuir al desarrollo de las habilidades y destrezas de sus alumnos. Como objetivos específicos se plantearon establecer los signos y/o síntomas que presentan los niños con dificultades de aprendizaje; Identificar las repercusiones psicológicas que presentan los niños con dificultades de aprendizaje; determinar si los maestros poseen conocimiento sobre las dificultades de aprendizaje; sugerir a los maestros diferentes técnicas de apoyo para que sus alumnos puedan afrontar las dificultades que presentan en su aprendizaje. Se platearon las siguientes interrogantes: ¿Cuáles son los signos y/o síntomas que presentan los niños con dificultades en el aprendizaje? ¿Cuáles son las repercusiones psicológicas que presentan los niños con dificultades en su aprendizaje? ¿Cómo afronta el maestro las dificultades y problemas en el aprendizaje? ¿Qué conocimiento tienen los maestros sobre los problemas y dificultades de aprendizaje? Las técnicas e instrumentos de recolección de datos que se utilizaron fueron: la observación, entrevista estructurada, y guías de observación. El lugar que se realizó la investigación fue en la Escuela Oficial Urbana Mixta No.141 “Quirina Tassi de Agostini” en un periodo de 3 meses, con niños de 9 a 12 años referidos por los docentes

    Neuropeptide S (NPS) variants modify the signaling and risk effects of NPS Receptor 1 (NPSR1) variants in asthma

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    Single nucleotide polymorphisms (SNPs) close to the gain-of-function substitution, Asn(107) Ile (rs324981, A>T), in Neuropeptide S Receptor 1 (NPSR1) have been associated with asthma. Furthermore, a functional SNP (rs4751440, G>C) in Neuropeptide S (NPS) encodes a Val(6)Leu substitution on the mature peptide that results in reduced bioactivity. We sought to examine the effects of different combinations of these NPS and NPSR1 variants on downstream signaling and genetic risk of asthma. In transfected cells, the magnitude of NPSR1-induced activation of cAMP/PKA signal transduction pathways and downstream gene expression was dependent on the combination of the NPS and NPSR1 variants with NPS-Val(6)/NPSR1-Ile(107) resulting in strongest and NPS-Leu(6)/NPSR1-Asn(107) in weakest effects, respectively. One or two copies of the NPS-Leu(6) (rs4751440) were associated with physician-diagnosed childhood asthma (OR: 0.67, 95% CI 0.49-0.92, p = 0.01) and together with two other linked NPS variants (rs1931704 and rs10830123) formed a protective haplotype (p = 0.008) in the Swedish birth cohort BAMSE (2033 children). NPS rs10830123 showed epistasis with NPSR1 rs324981 encoding Asn(107)Ile (p = 0.009) in BAMSE and with the linked NPSR1 rs17199659 (p = 0.005) in the German MAGIC/ISAAC II cohort (1454 children). In conclusion, NPS variants modify asthma risk and should be considered in genetic association studies of NPSR1 with asthma and other complex diseases.Peer reviewe

    DNA Methylation Levels in Mononuclear Leukocytes from the Mother and Her Child Are Associated with IgE Sensitization to Allergens in Early Life

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    DNA methylation changes may predispose becoming IgE-sensitized to allergens. We analyzed whether DNA methylation in peripheral blood mononuclear cells (PBMC) is associated with IgE sensitization at 5 years of age (5Y). DNA methylation was measured in 288 PBMC samples from 74 mother/child pairs from the birth cohort ALADDIN (Assessment of Lifestyle and Allergic Disease During INfancy) using the HumanMethylation450BeadChip (Illumina). PBMCs were obtained from the mothers during pregnancy and from their children in cord blood, at 2 years and 5Y. DNA methylation levels at each time point were compared between children with and without IgE sensitization to allergens at 5Y. For replication, CpG sites associated with IgE sensitization in ALADDIN were evaluated in whole blood DNA of 256 children, 4 years old, from the BAMSE (Swedish abbreviation for Children, Allergy, Milieu, Stockholm, Epidemiology) cohort. We found 34 differentially methylated regions (DMRs) associated with IgE sensitization to airborne allergens and 38 DMRs associated with sensitization to food allergens in children at 5Y (Sidak p ≤ 0.05). Genes associated with airborne sensitization were enriched in the pathway of endocytosis, while genes associated with food sensitization were enriched in focal adhesion, the bacterial invasion of epithelial cells, and leukocyte migration. Furthermore, 25 DMRs in maternal PBMCs were associated with IgE sensitization to airborne allergens in their children at 5Y, which were functionally annotated to the mTOR (mammalian Target of Rapamycin) signaling pathway. This study supports that DNA methylation is associated with IgE sensitization early in life and revealed new candidate genes for atopy. Moreover, our study provides evidence that maternal DNA methylation levels are associated with IgE sensitization in the child supporting early in utero effects on atopy predisposition.</p

    Identificación microscópica de un presunto protozoo Urbanorum spp. en zona rural del Departamento de Bolívar, Colombia

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    Desde su descripción inicial en los años noventa, una estructura denominada Urbanorum spp, ha generado controversias en la comunidad científica con respecto a su condición biológica. Por sus características morfológicas observadas bajo microscopia óptica, algunos bioanalistas lo han considerado un organismo protozoario. Sin embargo, no se cuenta con el respaldo científico suficiente para considerar a esta estructura un ser vivo y, aún más, para ser clasificado taxonómicamente como un parásito. En esta reflexión, se reportan por primera vez dos casos sobre la detección en heces de una estructura compatible con Urbanorum spp. en zona rural del departamento de Bolívar, Colombia. Adicionalmente, se analiza la prevalencia de hallazgos similares en países de América del Sur y se resalta la importancia de la aplicación futura de técnicas moleculares y genéticas para el estudio de estos casos

    Experience of autologous bone marrow mononuclear cells implantation as a treatment in patients with peripheral arterial disease : one year follow-up

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    ABSTRACT: Autologous bone marrow mononuclear cells have been shown to be safe and effective for treatment of patients with peripheral arterial disease (PAD). Angiogenesis can also be induced by growth factors synthesized by them. Objective: To determine in Colombia the feasibility, safety and outcome of the afore-mentioned treatment. Methods: After informed consent, bone marrow was obtained by aspiration under local anesthesia; mononuclear cells were concentrated and their number and viability were established. They were suspended in saline solution and implanted by intramuscular injection into the gastrocnemius muscles of ischemic legs. Control patients were left untreated. Clinical evaluation included several parameters. Flow cytometry was used for cell analysis. Results: Mean age of patients: 69 ± 11 years; cell viability: 99.15 ± 0.76%; total number of injected cells: 9.2 x 108 ± 6.2 x 108 . After treatment, angiographic studies showed the formation of new collateral vessels in all patients, with minimal thickness increase. There were no complications from bone marrow aspiration and intramuscular administration of cells. All treated patients experienced increase in the walking distance and improvement of rest pain. Conclusions: These preliminary results demonstrate that autologous cell therapy is safe, feasible and positively changes the natural history of patients with advanced peripheral arterial disease. In order to establish this treatment as a current practice in Colombia, we suggest the study of a larger number of patients.RESUMEN: Las células mononucleares de la médula ósea son efectivas para el tratamiento de pacientes con enfermedad arterial periférica (EAP). Los factores de crecimiento que ellas sintetizan se usan para inducir angiogénesis. Objetivo: establecer en Colombia la seguridad, factibilidad y resultado del tratamiento de la EAP utilizando células autólogas, para evitar su progreso a estadios más avanzados. Métodos: previo consentimiento, se hizo aspirado de médula ósea bajo anestesia local. Las células obtenidas se concentraron y se inyectaron intramuscularmente en los gastrocnemios de las extremidades isquémicas. El grupo control retrospectivo no recibió células. La evaluación clínica incluyó varios parámetros. Las células se analizaron por citometría de flujo. Resultados: edad media de los pacientes: 69 ± 11 años; viabilidad celular: 99,15% ± 0,76%; número de células inyectadas: 9,2 x 108 ± 6,2 x 108 . Los análisis angiográficos postratamiento mostraron formación de vasos colaterales nuevos en las extremidades afectadas, con mínimo engrosamiento. Se observaron aumento en la distancia caminada libre de dolor y mejoría del dolor en reposo. La obtención y aplicación de las células no se asoció con ninguna complicación. Conclusiones: este estudio preliminar demostró que la terapia celular autóloga es segura, factible y cambia positivamente la historia natural de la EAP. Se sugiere el estudio de un número mayor de pacientes antes de establecer este tratamiento en Colombia

    Age-associated DNA methylation changes in immune genes, histone modifiers and chromatin remodeling factors within 5 years after birth in human blood leukocytes

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    Abstract Background Age-related changes in DNA methylation occurring in blood leukocytes during early childhood may reflect epigenetic maturation. We hypothesized that some of these changes involve gene networks of critical relevance in leukocyte biology and conducted a prospective study to elucidate the dynamics of DNA methylation. Serial blood samples were collected at 3, 6, 12, 24, 36, 48 and 60 months after birth in ten healthy girls born in Finland and participating in the Type 1 Diabetes Prediction and Prevention Study. DNA methylation was measured using the HumanMethylation450 BeadChip. Results After filtering for the presence of polymorphisms and cell-lineage-specific signatures, 794 CpG sites showed significant DNA methylation differences as a function of age in all children (41.6% age-methylated and 58.4% age-demethylated, Bonferroni-corrected P value <0.01). Age-methylated CpGs were more frequently located in gene bodies and within +5 to +50 kilobases (kb) of transcription start sites (TSS) and enriched in developmental, neuronal and plasma membrane genes. Age-demethylated CpGs were associated to promoters and DNAse-I hypersensitivity sites, located within −5 to +5 kb of the nearest TSS and enriched in genes related to immunity, antigen presentation, the polycomb-group protein complex and cytoplasm. Conclusions This study reveals that susceptibility loci for complex inflammatory diseases (for example, IRF5, NOD2, and PTGER4) and genes encoding histone modifiers and chromatin remodeling factors (for example, HDAC4, KDM2A, KDM2B, JARID2, ARID3A, and SMARCD3) undergo DNA methylation changes in leukocytes during early childhood. These results open new perspectives to understand leukocyte maturation and provide a catalogue of CpG sites that may need to be corrected for age effects when performing DNA methylation studies in children
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