Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 33
Filtrar
Más filtros

Tipo del documento
Intervalo de año de publicación
1.
J Clin Gastroenterol ; 56(4): e263-e267, 2022 04 01.
Artículo en Inglés | MEDLINE | ID: mdl-34028395

RESUMEN

BACKGROUND: Helicobacter pylori (HP) infection has been implicated in several malignant and nonmalignant conditions. The confirmatory diagnosis of HP requires an endoscopic biopsy, followed by a rapid urease test, culture, and/or histopathologic examination using hemotoxylin and eosin, histochemical stains, or immunohistochemistry against HP. EndoFaster is a novel device that can perform real-time ammonium and pH measurements in gastric juice, allowing a diagnosis of HP during gastroduodenal endoscopy. GOAL: This study aimed to validate the accuracy of EndoFaster and to compare different histochemical and immunohistochemical techniques for the diagnosis of HP infection. STUDY: Consecutive patients who underwent upper endoscopy at our center were prospectively enrolled. During the endoscopy procedure, gastric juice was aspirated to perform an automatic analysis by EndoFaster and gastric biopsies were taken. Histologic sections were reviewed to assess the histopathologic features. The sensitivity, specificity, positive predictive value, and negative predictive value were calculated for the EndoFaster test, Diff-Quick (DQ), and immunohistochemistry against HP (anti-HP) using Warthin-Starry as the gold standard for HP detection. RESULTS: Overall, 80 patients were enrolled. In 19 cases (23,75%), histology was normal. In the remaining cases, varying degrees of inflammation were found. The sensitivity, specificity, positive predictive value, and negative predictive value were 73.33%, 86.00%, 75.86%, and 84.31% for the EndoFaster test using 67 ppm/mL as the positive threshold; 73.33%, 100%, 100%, and 86.21% for DQ; and 79.31%, 88.00%, 79.31%, and 88.00% for anti-HP, respectively. CONCLUSIONS: The EndoFaster test has good sensitivity and specificity for the diagnosis of HP during the gastroscopy procedure. DQ and anti-HP are excellent alternatives to Warthin-Starry for the detection of HP.


Asunto(s)
Compuestos de Amonio , Infecciones por Helicobacter , Helicobacter pylori , Biopsia , Infecciones por Helicobacter/diagnóstico , Humanos , Concentración de Iones de Hidrógeno , Inmunohistoquímica , Sensibilidad y Especificidad , Ureasa
2.
Int J Cancer ; 139(2): 334-46, 2016 07 15.
Artículo en Inglés | MEDLINE | ID: mdl-26954527

RESUMEN

Ingested nitrate leads to the endogenous synthesis of N-nitroso compounds (NOCs), animal carcinogens with limited human evidence. We aimed to evaluate the risk of colorectal cancer (CRC) associated with nitrate exposure in drinking water and diet. A case-control study in Spain and Italy during 2008-2013 was conducted. Hospital-based incident cases and population-based (Spain) or hospital-based (Italy) controls were interviewed on residential history, water consumption since age 18, and dietary information. Long-term waterborne ingested nitrate was derived from routine monitoring records, linked to subjects' residential histories and water consumption habits. Dietary nitrate intake was estimated from food frequency questionnaires and published food composition databases. Odd ratios (OR) were calculated using mixed models with area as random effect, adjusted for CRC risk factors and other covariables. Generalized additive models (GAMs) were used to analyze exposure-response relationships. Interaction with endogenous nitrosation factors and other covariables was also evaluated. In total 1,869 cases and 3,530 controls were analyzed. Average waterborne ingested nitrate ranged from 3.4 to 19.7 mg/day, among areas. OR (95% CIs) of CRC was 1.49 (1.24, 1.78) for >10 versus ≤5 mg/day, overall. Associations were larger among men versus women, and among subjects with high red meat intake. GAMs showed increasing exposure-response relationship among men. Animal-derived dietary nitrate was associated with rectal, but not with colon cancer risk. In conclusion, a positive association between CRC risk and waterborne ingested nitrate is suggested, mainly among subgroups with other risk factors. Heterogeneous effects of nitrate from different sources (water, animal and vegetables) warrant further research.


Asunto(s)
Neoplasias Colorrectales/epidemiología , Neoplasias Colorrectales/etiología , Dieta , Agua Potable , Nitratos/efectos adversos , Adulto , Anciano , Anciano de 80 o más Años , Estudios de Casos y Controles , Dieta/efectos adversos , Agua Potable/efectos adversos , Exposición a Riesgos Ambientales/efectos adversos , Femenino , Humanos , Incidencia , Italia/epidemiología , Masculino , Persona de Mediana Edad , Vigilancia de la Población , Riesgo , España/epidemiología , Adulto Joven
3.
Exp Parasitol ; 159: 245-51, 2015 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-26496790

RESUMEN

Entamoeba histolytica programmed cell death (PCD) induced by G418 is characterized by the release of important amounts of intracellular calcium from reservoirs. Nevertheless, no typical caspases have been detected in the parasite, the PCD phenotype is inhibited by the cysteine protease inhibitor E-64. These results strongly suggest that Ca(2+)-dependent proteases could be involved in PCD. In this study, we evaluate the expression and activity of a specific dependent Ca(2+) protease, the calpain-like protease, by real-time quantitative PCR (RTq-PCR), Western blot assays and a enzymatic method during the induction of PCD by G418. Alternatively, using cell viability and TUNEL assays, we also demonstrated that the Z-Leu-Leu-Leu-al calpain inhibitor reduced the rate of cell death. The results demonstrated 4.9-fold overexpression of calpain-like gene 1.5 h after G418 PCD induction, while calpain-like protein increased almost two-fold with respect to basal calpain-like expression after 3 h of induction, and calpain activity was found to be approximately three-fold higher 6 h after treatment compared with untreated trophozoites. Taken together, these results suggest that this Ca(2+)-dependent protease could be involved in the executory phase of PCD.


Asunto(s)
Cisteína Endopeptidasas/metabolismo , Entamoeba histolytica/citología , Amebicidas/farmacología , Secuencia de Aminoácidos , Western Blotting , Calcio/metabolismo , Calpaína/antagonistas & inhibidores , Calpaína/metabolismo , Cisteína Endopeptidasas/química , Cisteína Endopeptidasas/genética , Inhibidores de Cisteína Proteinasa/farmacología , Fragmentación del ADN , Densitometría , Entamoeba histolytica/efectos de los fármacos , Entamoeba histolytica/enzimología , Entamoeba histolytica/genética , Regulación Enzimológica de la Expresión Génica , Gentamicinas/farmacología , Etiquetado Corte-Fin in Situ , Leucina/análogos & derivados , Leucina/farmacología , Leupeptinas/farmacología , Microscopía Confocal , Datos de Secuencia Molecular , Reacción en Cadena en Tiempo Real de la Polimerasa
4.
Expert Rev Clin Pharmacol ; 16(9): 877-883, 2023.
Artículo en Inglés | MEDLINE | ID: mdl-37477611

RESUMEN

BACKGROUND: Histamine type-2-receptor antagonist drugs (H2-antagonists) have been used as standard treatment to prevent hypersensitivity reactions (HRs) in paclitaxel-containing regimens, however, their use has been strongly questioned. Ranitidine has been the most widely used H2-antagonist. Therefore, especially after its withdrawal from the market, the objective of this study is to determine the impact of its elimination from premedication on HR incidence. METHODS: A cohort, multicenter, observational, prospective, and non-inferiority study, including paclitaxel-naïve cancer patients, designed to determine the incidence of HRs of any grade associated with paclitaxel administration and analyze non-inferiority against the incidence estimated in the literature (20%), with 5% as the maximum difference (Δ). Patients with a solid neoplasm of any type/stage, who initiated treatment with paclitaxel without H2-antagonists in the premedication regimen were enrolled. RESULTS: A total of 441 patients were included, of whom 50 presented 54 HRs of any grade. The cumulative incidence was 11.3% (95%CI 8.5-14.7), thus fulfilling the hypothesis of non-inferiority. Of the overall HRs detected, 15 were grade ≥ 3 with a cumulative incidence of 3.4% (95%CI 1.9-5.5). CONCLUSIONS: This study demonstrates that the elimination of ranitidine from paclitaxel premedication schedules is non-inferior in the development of HRs of any grade compared to the administration of H2-antagonists.


Asunto(s)
Antineoplásicos Fitogénicos , Hipersensibilidad a las Drogas , Neoplasias , Humanos , Antineoplásicos Fitogénicos/uso terapéutico , Hipersensibilidad a las Drogas/epidemiología , Hipersensibilidad a las Drogas/etiología , Hipersensibilidad a las Drogas/prevención & control , Antagonistas de los Receptores H2 de la Histamina/efectos adversos , Neoplasias/tratamiento farmacológico , Neoplasias/complicaciones , Paclitaxel/efectos adversos , Premedicación , Estudios Prospectivos , Ranitidina/efectos adversos
5.
Dev Cell ; 13(3): 338-50, 2007 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-17765678

RESUMEN

Epithelial tubes represent fundamental building blocks of metazoan organisms; however, the mechanisms responsible for their formation and maintenance are not well understood. Here, we show that the evolutionarily conserved coiled-coil MAGUK protein Dlg5 is required for epithelial tube maintenance in mammalian brain and kidneys. We demonstrate that Dlg5(-/-) mice develop fully penetrant hydrocephalus and kidney cysts caused by a deficiency in membrane delivery of cadherin-catenin adhesion complexes and loss of cell polarity. Dlg5 travels with cadherin-containing vesicles and binds to syntaxin 4, a t-SNARE protein that regulates fusion of transport vesicles with the lateral membrane domain. We propose that Dlg5 functions in plasma membrane delivery of cadherins by linking cadherin-containing transport vesicles with the t-SNARE targeting complex. These findings show that Dlg5 is causally involved in hydrocephalus and renal cysts and reveal that targeted membrane delivery of cadherin-catenin adhesion complexes is critical for cell polarity and epithelial tube maintenance.


Asunto(s)
Cadherinas/metabolismo , Proteínas Portadoras/metabolismo , Hidrocefalia/etiología , Enfermedades Renales Poliquísticas/etiología , Uniones Adherentes/metabolismo , Animales , Animales Recién Nacidos , Cadherinas/genética , Proteínas Portadoras/genética , Línea Celular , Membrana Celular/metabolismo , Polaridad Celular , Células Cultivadas , Perros , Electroporación , Células Epiteliales/metabolismo , Fibroblastos/metabolismo , Guanilato-Quinasas/genética , Humanos , Hidrocefalia/patología , Hibridación in Situ , Riñón/citología , Cinética , Proteínas de la Membrana/genética , Ratones , Ratones Noqueados , Modelos Biológicos , Enfermedades Renales Poliquísticas/patología , Proteínas Qa-SNARE/metabolismo , Transfección , beta Catenina/metabolismo
6.
Adicciones ; 24(4): 319-27, 2012.
Artículo en Inglés | MEDLINE | ID: mdl-23241719

RESUMEN

The aim of this study is to identify personal factors associated with drugs use and the practice of physical activity in a college student population in northwest Spain. A cross-sectional survey was conducted between January and April 2010 using a self-administered questionnaire including questions concerning gender, age, course and year of study, living arrangements and work. Participants were asked also about current tobacco use, alcohol drinking and heavy episodic drinking, illegal drugs use, and frequency of physical activity. Prevalences were calculated and bivariate and multivariate logistic regression analyses were conducted to calculate separate models for the different habits making adjustments for the demographic variables. Most of students consumed alcohol (78.3%), with 31.7% consuming tobacco and 34% having used illegal drugs at some point. The prevalence of sufficient physical activity was about 22.7% and it was clearly lower in women and in courses no linked with sports. Women have been lesser consumers of illegal drugs and alcohol. However, heavy episodic drinking is clearly associated with women. Living with friends was noticed as a risk factor, both for tobacco use and the consumption of alcohol and illegal drugs, when compared with living at home. Courses of study connected with sport, health and education showed a lower prevalence of drug uses than the other courses analysed. Since distribution of drug use and insufficient physical activity depending on gender, living arrangement and the course of study, it would be appropriate to design more efficient interventions of health promotion take these differences into account.


Asunto(s)
Hábitos , Actividad Motora , Características de la Residencia , Estudiantes , Trastornos Relacionados con Sustancias/epidemiología , Estudios Transversales , Femenino , Humanos , Masculino , Prevalencia , Factores Sexuales , España , Universidades , Adulto Joven
7.
Cancers (Basel) ; 14(17)2022 Aug 26.
Artículo en Inglés | MEDLINE | ID: mdl-36077670

RESUMEN

Digital and interactive health interventions (DIHIs), such as virtual-reality-based therapy (VRBT) and smartphone-app-based therapy (SABT), may be useful for reducing the impact of the signs and symptoms of breast cancer (BC) in women. The aim of this meta-analysis was to explore the effect of DIHIs on improving pain, anxiety, depression, quality of life (QoL), and upper extremity (UE) disability-related lymphedema in women with BC. METHODS: We searched PubMed Medline, Web of Science, Scopus, CINAHL, Physiotherapy Evidence Database, and SciELO for the period ending February 2022. We included studies that assessed the effect of DIHIs on UE motor disability, pain, anxiety, depression, and QoL in women with BC. The effect size was calculated using Cohen's standardized mean difference (SMD) and its 95% confidence interval (95% CI). RESULTS: Twenty studies providing data from 1613 women with BC were included. With respect to UE disability, DIHIs increased flexion (SMD, 1.92; 95%CI: -1.16, 2.68), abduction (SMD, 1.66; 95%CI: 0.91, 2.42), external rotation shoulder range of motion (SMD, 1.1; 95%CI: 0.36, 1.85), UE function (SMD, -0.72; 95%CI: -1.31, -0.13), and handgrip strength (SMD, 0.4; 95%CI: 0.21, 0.59). DIHIs reduced pain (SMD, -0.8; 95%CI: -1.31, -0.26), anxiety (SMD, -1.02; 95%CI: -1.71, -0.34), and depression (SMD, -1.57; 95%CI: -3.1, -0.08). Finally, DIHIs increased overall health (SMD, 0.6; 95%CI: 0.31, 0.89). CONCLUSIONS: Right at the end of therapy, DIHIs are effective at improving UE function, pain, anxiety, depression, and QoL in women with BC. VRBT has a greater effect than SABT for the assessed outcomes.

8.
PLoS Negl Trop Dis ; 16(2): e0010232, 2022 02.
Artículo en Inglés | MEDLINE | ID: mdl-35202395

RESUMEN

BACKGROUND: Chagas disease (CD) has become an emerging global health problem in association with the immigration of individuals from endemic areas (in LatinAmerica) to other countries.Spain is the country in Europe with the highest number of CD cases. Concerning pediatric CD, treatment is not only better tolerated by younger children but also has greater cure possibilities. The aim of this study was to describe clinical and epidemiological aspects of CD in a pediatric population diagnosed of 10 hospitals in the Community of Madrid during the 2004-2018 period, as well as the safety and efficacy of CD treatment on this population. METHODOLOGY/PRINCIPAL FINDINGS: A multicenter, retrospective, descriptive study was conducted. The studied population included all identified children under the age of 18 with a diagnosis of CD. Diagnosis was performed with a positive parasitological test (with subsequent confirmation) or confirmed persistence of positive serology beyond 9 months, for children younger than one year-old, and with two different positive serological tests, for children older than one. Fifty-one children were included (59% male; 50.9% born in Spain). All mothers were from Latin America. The median age at diagnosis was 0.7 months for those under one year of age, and 11.08 years for those older than one year-old. Only one case presented a symptomatic course (hydrops faetalis, haemodynamic instability at birth, ascites, anaemia). For 94% treatment was completed. Considering patients who received benznidazole (47), AE were recorded in 48,9%. Among the 32 patients older than one year-old treated with benznidazole, 18 (56.25%) had adverse events whereas in the 15 under one year, 5(33,3%) did. Eigtheen (78.2%) of the patients with benznidazole AE were older than one year-old(median age 11.4 years). Of the patients treated with nifurtimox (9), AE were reported in 3 cases (33,3%). Cure was confirmed in 80% of the children under one year-old vs 4.3% in those older (p<0.001). Loss to follow- up occurred in 35.3% of patients. CONCLUSIONS/SIGNIFICANCES: Screening programs of CD since birth allow early diagnosis and treatment, with a significantly higher cure rate in children treated before one year of age, with lower incidence of adverse events. The high proportion of patients lost to follow-up in this vulnerable population is of concern.


Asunto(s)
Enfermedad de Chagas , Trypanosoma cruzi , Enfermedad de Chagas/diagnóstico , Enfermedad de Chagas/tratamiento farmacológico , Enfermedad de Chagas/epidemiología , Niño , Emigración e Inmigración , Femenino , Humanos , Lactante , Recién Nacido , Masculino , Nifurtimox/uso terapéutico , Estudios Retrospectivos
9.
Methods Mol Biol ; 2512: 153-179, 2022.
Artículo en Inglés | MEDLINE | ID: mdl-35818005

RESUMEN

Microbial communities' taxonomic and functional diversity has been broadly studied since sequencing technologies enabled faster and cheaper data obtainment. Nevertheless, the programming skills needed and the amount of software available may be overwhelming to someone trying to analyze these data. Here, we present a comprehensive and straightforward pipeline that takes shotgun metagenomics data through the needed steps to obtain valuable results. The raw data goes through a quality control process, metagenomic assembly, binning (the obtention of single genomes from a metagenome), taxonomic assignment, and taxonomic diversity analysis and visualization.


Asunto(s)
Metagenómica , Microbiota , Biología Computacional/métodos , Metagenoma , Metagenómica/métodos , Análisis de Secuencia de ADN/métodos , Programas Informáticos
10.
J Adv Nurs ; 67(4): 747-55, 2011 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-21143623

RESUMEN

AIM: This paper is a report of the effectiveness of a tobacco use prevention and control course on health sciences students' smoking prevalence and incidence. BACKGROUND: Although it is known that the intervention of health professionals in their patients' tobacco use can be affected by their own habit, very few studies have analysed the effect of specific tobacco-oriented training on smoking among health science students. METHODS: This study is a quasi-experimental study of community intervention. During the years 2005-2008, a total of 290 health science students on the intervention campus and 256 on the control campus took part in the study. In the former, the intervention consisted of a course on the prevention and control of tobacco use for students, which was not offered on the control campus. Data about tobacco use and socio-demographic variables were collected by means of a questionnaire before and 6 months after the intervention. RESULTS: Prevalence of tobacco use decreased in the intervention group (-1.1%) and increased in the control group (1.5%). The risk of acquiring the habit was almost three times higher in the control group than in the intervention group and the probability of cessation was 40% higher in the intervention group and correlated with nicotine dependence. CONCLUSION: The intervention suggests the effect on habit acquisition was slight but not so on cessation. Preventive interventions should be carried out before students go to university, while more specific cessation programmes are required to reduce tobacco use among students.


Asunto(s)
Conocimientos, Actitudes y Práctica en Salud , Cese del Hábito de Fumar/estadística & datos numéricos , Prevención del Hábito de Fumar , Fumar/epidemiología , Estudiantes del Área de la Salud/estadística & datos numéricos , Curriculum , Femenino , Personal de Salud/psicología , Personal de Salud/estadística & datos numéricos , Humanos , Incidencia , Masculino , Modelos de Enfermería , Investigación en Evaluación de Enfermería , Prevalencia , Estudiantes del Área de la Salud/psicología , Tabaquismo/epidemiología , Tabaquismo/prevención & control , Adulto Joven
11.
J Exp Med ; 195(10): 1247-55, 2002 May 20.
Artículo en Inglés | MEDLINE | ID: mdl-12021305

RESUMEN

Transforming growth factor (TGF)-beta is the prototype in a family of secreted proteins that act in autocrine and paracrine pathways to regulate cell development and function. Normal cells typically coexpress TGF-beta receptors and one or more isoforms of TGF-beta, thus the synthesis and secretion of TGF-beta as an inactive latent complex is considered an essential step in regula-ting the activity of this pathway. To determine whether intracellular activation of TGF-beta results in TGF-beta ligand-receptor interactions within the cell, we studied pristane-induced plasma cell tumors (PCTs). We now demonstrate that active TGF-beta1 in the PCT binds to intracellular TGF-beta type II receptor (TbetaRII). Disruption of the expression of TGF-beta1 by antisense TGF-beta1 mRNA restores localization of TbetaRII at the PCT cell surface, indicating a ligand-induced impediment in receptor trafficking. We also show that retroviral expression of a truncated, dominant-negative TbetaRII (dnTbetaRII) effectively competes for intracellular binding of active ligand in the PCT and restores cell surface expression of the endogenous TbetaRII. Analysis of TGF-beta receptor-activated Smad2 suggests the intracellular ligand-receptor complex is not capable of signaling. These data are the first to demonstrate the formation of an intracellular TGF-beta-receptor complex, and define a novel mechanism for modulating the TGF-beta signaling pathway.


Asunto(s)
Receptores de Factores de Crecimiento Transformadores beta/metabolismo , Transducción de Señal/efectos de los fármacos , Factor de Crecimiento Transformador beta/metabolismo , Animales , Comunicación Autocrina , Western Blotting , Membrana Celular/metabolismo , Proteínas de Unión al ADN/metabolismo , Ligandos , Ratones , Plasmacitoma/inducido químicamente , Plasmacitoma/enzimología , Plasmacitoma/metabolismo , Unión Proteica , Proteínas Serina-Treonina Quinasas , Transporte de Proteínas , ARN sin Sentido/genética , Receptor Tipo II de Factor de Crecimiento Transformador beta , Proteína Smad2 , Terpenos/farmacología , Transactivadores/metabolismo , Factor de Crecimiento Transformador beta/genética
12.
Ambio ; 47(7): 771-780, 2018 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-29478180

RESUMEN

Floods in cities are increasingly common as a consequence of multifactor watershed dynamics, including geomorphology, land-use changes and land subsidence. However, urban managers have focused on infrastructure to address floods by reducing blocked sewage infrastructure, without significant success. Using Mexico City as a case study, we generated a spatial flood risk model with geomorphology and anthropogenic variables. The results helped contrast the implications of different public policies in land use and waste disposal, and correlating them with flood hazards. Waste disposal was only related to small floods. 58% of the city has a high risk of experiencing small floods, and 24% of the city has a risk for large floods. Half of the population with the lowest income is located in the high-risk areas for large floods. These models are easy to build, generate fast results and are able to help to flood policies, by understanding flood interactions in urban areas within the watershed.


Asunto(s)
Inundaciones , Residuos Sólidos/efectos adversos , Urbanización , Altitud , Ciudades , Agua Subterránea , Humanos , Renta , Lagos , Modelos Lineales , México , Modelos Teóricos , Lluvia , Aguas del Alcantarillado , Cambio Social , Movimientos del Agua , Humedales
13.
Medicentro (Villa Clara) ; 27(4)dic. 2023.
Artículo en Español | LILACS | ID: biblio-1534856

RESUMEN

En la actualidad la capacidad de distinguir cuáles son las fuentes que brindan una información confiable es la herramienta más importante para los investigadores. Por tanto, es necesario profundizar en el uso de fuentes de información veraz y actualizada, y la importancia de evaluarlas. Esta problemática toma mayor fuerza en el área de la salud, por lo que las instituciones en cuestión, se han proyectado en este tipo de estudio. Tal es el caso del Centro Provincial de Información de Ciencias Médicas de Villa Clara, que se propuso evaluar el uso de la Biblioteca Virtual de Salud de Cuba por los bibliotecarios de la red de bibliotecas médicas de la provincia, cuyo objetivo fundamental es satisfacer las necesidades de sus usuarios.


Currently, the ability to distinguish which sources provide reliable information is the most important tool for researchers. Therefore, it is necessary to deepen the use of truthful and updated information sources, and the importance of evaluating them. This problem takes greater importance in the health area, that is why the institutions in question have been projected in this type of study. Such is the case of the Provincial Information Center for Medical Sciences from Villa Clara, which proposed to evaluate the use of the Cuban Virtual Health Library by the librarians of the network of medical libraries in the province, whose fundamental objective is to satisfy the needs of its users.


Asunto(s)
Fuentes de Información , Estudio de Evaluación , Bibliotecas Digitales
14.
Artículo en Inglés | MEDLINE | ID: mdl-30319995

RESUMEN

Oxygen or nitrogen oxidative species and chemical stress induce the programmed cell death (PCD) of Entamoeba histolytica trophozoites. PCD caused by the aminoglycoside G418 is reduced by incubation with the cysteine protease inhibitor E-64; however, no typical caspases or metacaspases have been detected in this parasite. Calpain, a cysteine protease activated by calcium, has been suggested to be part of a specific PCD pathway in this parasite because the specific calpain inhibitor Z-Leu-Leu-Leu-al diminishes the PCD of trophozoites. Here, we predicted the hypothetical 3D structure of a calpain-like protein of E. histolytica and produced specific antibodies against it. We detected the protein in the cytoplasm and near the nucleus. Its expression gradually increased during incubation with G418, with the highest level after 9 h of treatment. In addition, a specific calpain-like siRNA sequence reduced the cell death rate by 65%. All these results support the hypothesis that the calpain-like protein is one of the proteases involved in the execution phase of PCD in E. histolytica. The hypothetical interactome of the calpain-like protein suggests that it may activate or regulate other proteins that probably participate in PCD, including those with EF-hand domains or other calcium-binding sites.


Asunto(s)
Apoptosis , Calpaína/metabolismo , Entamoeba histolytica/fisiología , Calpaína/antagonistas & inhibidores , Biología Computacional , Entamoeba histolytica/efectos de los fármacos , Activadores de Enzimas/metabolismo , Gentamicinas/metabolismo , Mapas de Interacción de Proteínas
15.
Sci Rep ; 8(1): 2610, 2018 02 08.
Artículo en Inglés | MEDLINE | ID: mdl-29422554

RESUMEN

The ability to remember the details of our own experiences declines gradually as we get old. The reason for this decay has been attributed to several factors besides age, such as education, nutrient intake and health status. However, the influence of these factors has mainly been examined individually and rarely together. Here we identify those factors that jointly act as mediators of episodic memory decay across the adult life span. We examined source memory in a lifespan sample of 1557 healthy adults. A total of 70 physical, biological and lifestyle variables were measured and introduced into a structural equation model as potential mediators that intervene between age and source memory. Only 14 mediator variables reliably mediated source memory decay; notably, eight of these variables have an effect on the cardiovascular system. The model unequivocally highlights that the mediators that may impair cardiovascular functioning also impact brain resources involved in episodic memory. We identified the factors that are relevant to episodic memory decline when they interact together as occurs in real life.


Asunto(s)
Envejecimiento Cognitivo , Estilo de Vida , Trastornos de la Memoria/fisiopatología , Memoria Episódica , Adulto , Factores de Edad , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Masculino , Recuerdo Mental , México , Persona de Mediana Edad , Pruebas Neuropsicológicas
16.
Geroscience ; 40(3): 293-303, 2018 06.
Artículo en Inglés | MEDLINE | ID: mdl-29968229

RESUMEN

Working memory abilities significantly decrease with advancing age; hence, the search for factors that may increase or mitigate this decline is critical. Several factors have been identified that influence working memory; however, their effects have been mainly assessed separately and rarely together with other factors in the same sample. We examined 120 variables to search for factors that jointly act as mediators of working memory decay across the adult life span. A sample of 1652 healthy adults was assessed in spatial and verbal working memory domains. Structural equation modeling analyses were conducted to search for potential mediators that intervened between age and working memory. Only 14 and 10 variables reliably mediated spatial and verbal working memory, respectively. Factors from several domains remained in the models, such as individual characteristics, physiological traits, consumption habits, and regular activities. These factors are sufficiently powerful to influence working memory decline when they jointly interact, as in everyday living.


Asunto(s)
Memoria a Corto Plazo/fisiología , Adulto , Factores de Edad , Anciano , Anciano de 80 o más Años , Escolaridad , Femenino , Conductas Relacionadas con la Salud , Humanos , Análisis de Clases Latentes , Masculino , Persona de Mediana Edad , Pruebas Neuropsicológicas , Conducta Social , Adulto Joven
17.
N Engl J Med ; 351(6): 552-9, 2004 Aug 05.
Artículo en Inglés | MEDLINE | ID: mdl-15295048

RESUMEN

BACKGROUND: The receptors for transforming growth factor beta (TGF-beta) and their signaling intermediates make up an important tumor-suppressor pathway. The role of one of these intermediates--Smad3--in the pathogenesis of lymphoid neoplasia is unknown. METHODS: We measured Smad3 messenger RNA (mRNA) and protein in leukemia cells obtained at diagnosis from 19 children with acute leukemia, including 10 with T-cell acute lymphoblastic leukemia (ALL), 7 with pre-B-cell ALL, and 2 with acute nonlymphoblastic leukemia (ANLL). All nine exons of the SMAD3 gene (MADH3) were sequenced. Mice in which one or both alleles of Smad3 were inactivated were used to evaluate the role of Smad3 in the response of normal T cells to TGF-beta and in the susceptibility to spontaneous leukemogenesis in mice in which both alleles of the tumor suppressor p27Kip1 were deleted. RESULTS: Smad3 protein was absent in T-cell ALL but present in pre-B-cell ALL and ANLL. No mutations were found in the MADH3 gene in T-cell ALL, and Smad3 mRNA was present in T-cell ALL and normal T cells at similar levels. In mice, the loss of one allele for Smad3 impairs the inhibitory effect of TGF-beta on the proliferation of normal T cells and works in tandem with the homozygous inactivation of p27Kip1 to promote T-cell leukemogenesis. CONCLUSIONS: Loss of Smad3 protein is a specific feature of pediatric T-cell ALL. A reduction in Smad3 expression and the loss of p27Kip1 work synergistically to promote T-cell leukemogenesis in mice.


Asunto(s)
Proteínas de Ciclo Celular/genética , Proteínas de Unión al ADN/metabolismo , Leucemia de Células T/metabolismo , Leucemia-Linfoma de Células T del Adulto/metabolismo , Linfocitos T/metabolismo , Transactivadores/metabolismo , Factor de Crecimiento Transformador beta/metabolismo , Proteínas Supresoras de Tumor/genética , Adulto , Animales , Proteínas de Ciclo Celular/metabolismo , Niño , Inhibidor p27 de las Quinasas Dependientes de la Ciclina , Proteínas de Unión al ADN/genética , Exones , Eliminación de Gen , Expresión Génica , Humanos , Interleucina-2/biosíntesis , Leucemia Mieloide Aguda/genética , Leucemia Mieloide Aguda/metabolismo , Leucemia de Células T/genética , Leucemia-Linfoma de Células T del Adulto/genética , Ratones , Ratones Noqueados , Leucemia-Linfoma Linfoblástico de Células Precursoras/genética , Leucemia-Linfoma Linfoblástico de Células Precursoras/metabolismo , ARN Mensajero/biosíntesis , ARN Mensajero/genética , Receptores de Factores de Crecimiento Transformadores beta/metabolismo , Análisis de Secuencia de ADN , Transducción de Señal , Proteína smad3 , Transactivadores/genética , Proteínas Supresoras de Tumor/metabolismo
18.
Dev Cell ; 41(5): 481-495.e5, 2017 06 05.
Artículo en Inglés | MEDLINE | ID: mdl-28552558

RESUMEN

Malformations of the cerebral cortex (MCCs) are devastating developmental disorders. We report here that mice with embryonic neural stem-cell-specific deletion of Llgl1 (Nestin-Cre/Llgl1fl/fl), a mammalian ortholog of the Drosophila cell polarity gene lgl, exhibit MCCs resembling severe periventricular heterotopia (PH). Immunohistochemical analyses and live cortical imaging of PH formation revealed that disruption of apical junctional complexes (AJCs) was responsible for PH in Nestin-Cre/Llgl1fl/fl brains. While it is well known that cell polarity proteins govern the formation of AJCs, the exact mechanisms remain unclear. We show that LLGL1 directly binds to and promotes internalization of N-cadherin, and N-cadherin/LLGL1 interaction is inhibited by atypical protein kinase C-mediated phosphorylation of LLGL1, restricting the accumulation of AJCs to the basolateral-apical boundary. Disruption of the N-cadherin-LLGL1 interaction during cortical development in vivo is sufficient for PH. These findings reveal a mechanism responsible for the physical and functional connection between cell polarity and cell-cell adhesion machineries in mammalian cells.


Asunto(s)
Encéfalo/anomalías , Adhesión Celular/fisiología , Polaridad Celular/fisiología , Células Madre Embrionarias/fisiología , Proteínas de Homeodominio/fisiología , Células-Madre Neurales/fisiología , Heterotopia Nodular Periventricular/patología , Proteínas Supresoras de Tumor/fisiología , Animales , Apoptosis , Encéfalo/metabolismo , Encéfalo/patología , Cadherinas/genética , Cadherinas/metabolismo , Proliferación Celular , Células Cultivadas , Proteínas del Citoesqueleto , Células Madre Embrionarias/citología , Femenino , Ratones , Ratones Transgénicos , Nestina/genética , Nestina/metabolismo , Células-Madre Neurales/citología , Heterotopia Nodular Periventricular/metabolismo , Fosforilación
19.
Vive (El Alto) ; 4(10): 86-95, abr. 2021. ilus.
Artículo en Español | LILACS | ID: biblio-1292862

RESUMEN

El presente estudio trata sobre una revisión documental relacionada con la predictibilidad en el diagnóstico utilizando Watson de IBM, el cual tiene como objetivo principal conocer el nivel de predictibilidad en el diagnóstico con Watson de IMB se ha utilizado un diseño no experimental de corte cualitativo donde las técnicas de recolección de datos han sido la revisión documental y el análisis de datos provenientes de estudios realizados por expertos que validan el uso de este tipo de tecnología, de acuerdo a los documentos consultados y en función de la opinión de los expertos se puede referir que la hipótesis planteada "el conocer el nivel de predictibilidad en el diagnóstico utilizando Watson de IMB contribuye a su implementación en el diagnóstico de enfermedades de orden oncológico" se cumple y como parte de algunas de las conclusiones las cuales refiere que el uso de este tipo de tecnología aporta a la prontitud en la generación de diagnósticos más certeros y con un nivel de predictibilidad media ­ alta, al igual que es una oportunidad para el trabajo colaborativo entre profesionales de la salud y representa la necesidad imperante de actualizar sus conocimientos para proporcionar datos de calidad que faciliten una mayor predictibilidad del diagnóstico


The present study deals with a documentary review related to the predictability in the diagnosis using IBM Watson, which has as its main objective to know the level of predictability in the diagnosis with IBM Watson. a qualitative non-experimental design has been used where the data collection techniques have been the documentary review and the analysis of data from studies conducted by experts who validate the use of this type of technology, according to the documents consulted and based on the opinion of the experts, it can be stated that the hypothesis knowing the level of predictability in the diagnosis with Watson IMB contributes to its implementation in the diagnosis of oncological diseases is fulfilled and as part of some of the conclusions it is stated that the use of this type of technology contributes to the promptness in the generation of more accurate diagnoses and with a medium-high level of predictability, It is also an opportunity for collaborative work among health professionals and represents the imperative need to update their knowledge in order to provide quality data that facilitate greater diagnostic predictability


O presente estudo trata de uma revisão documental relacionada à previsibilidade no diagnóstico com o Watson da IBM, cujo objetivo principal é conhecer o nível de previsibilidade no diagnóstico com o Watson do IMB. Utilizou-se um desenho qualitativo não experimental onde foi utilizado. as técnicas de coleta de dados foram a revisão documental e a análise de dados de estudos realizados por especialistas que validam o uso desse tipo de tecnologia, de acordo com os documentos consultados e com base na opinião dos especialistas, pode-se referir que o hipótese levantada conhecer o nível de previsibilidade no diagnóstico com o Watson do IMB contribui para sua implementação no diagnóstico de doenças oncológicas é atendida e faz parte de algumas das conclusões que referem que o uso deste tipo de tecnologia contribui para a prontidão na geração de diagnósticos mais precisos e com um nível de pré ditabilidade média-alta, pois é uma oportunidade de trabalho colaborativo entre os profissionais de saúde e representa a necessidade predominante de atualização de conhecimentos para fornecer dados de qualidade que possibilitem maior previsibilidade do diagnóstico.


Asunto(s)
Revisión , Enfermedad , Oncología Médica
20.
Edumecentro ; 11(3): 269-274, jul.-set. 2019.
Artículo en Español | LILACS | ID: biblio-1089962

RESUMEN

RESUMEN En la historia de la humanidad la información ha sido un recurso de poder. Actualmente el desarrollo de las tecnologías de la información y las comunicaciones demanda de los profesionales de la información formar sujetos como usuarios inteligentes, lo que tributa un incremento de la calidad científica. Es objetivo de los autores profundizar en el tema por la necesidad de gestionar información sobre las estrategias de trabajo del Ministerio de Salud Pública de Cuba, cuyos programas están proyectados a dar solución a los principales problemas de salud existentes en el país, los cuales requieren cada día mayor sustento científico; por otra parte, la evaluación de la gestión de información constituye un valioso instrumento para evidenciar los niveles de preparación de los especialistas y directivos que conducen esta actividad y del rol de la información científica en la calidad de los resultados alcanzados.


ABSTRACT In the history of humanity, information has been a resource of power. Currently, the development of information and communication technologies demands that information professionals form subjects as intelligent users, which increases scientific quality. The objective of the authors is to deepen the topic by the need to manage information on the work strategies of the Ministry of Public Health of Cuba, whose programs are projected to solve the main health problems in the country, which require each day greater scientific foundations; on the other hand, the evaluation of information management is a valuable tool to demonstrate the levels of preparation of the specialists and managers who carry out this activity and the role of scientific information in the quality of the results achieved.


Asunto(s)
Gestión de la Información , Educación Médica , Programas Nacionales de Salud
SELECCIÓN DE REFERENCIAS
DETALLE DE LA BÚSQUEDA