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1.
J. physiol. biochem ; 79(1): 163-174, feb. 2023.
Artigo em Inglês | IBECS | ID: ibc-215721

RESUMO

C-terminal tensin-like (CTEN) is a tensin family protein typically localized to the cytoplasmic side of focal adhesions, and primarily contributes to cell adhesion and migration. Elevated expression and nuclear accumulation of CTEN have been reported in several types of cancers and found to be associated with malignant behaviors. However, the function of nuclear CTEN remains elusive. In this study, we report for the first time that nuclear CTEN associates with chromatin DNA and occupies the region proximal to the transcription start site in several genes. The mRNA expression level of CTEN positively correlates with that of one of its putative target genes, cell division cycle protein 27 (CDC27), in a clinical colorectal cancer dataset, suggesting that CTEN may play a role in the regulation of CDC27 gene expression. Furthermore, we demonstrated that CTEN is recruited to the promoter region of the CDC27 gene and that the mRNA expression and promoter activity of CDC27 are both reduced when CTEN is downregulated. In addition, we found that enhanced nuclear accumulation of CTEN in HCT116 cells by overexpression of CTEN fused with nuclear localization signals increases CDC27 transcript levels and promoter activity. The increased nuclear-localized CTEN also significantly promotes cell migration, and the migratory ability is suppressed when CDC27 is knocked down. These results demonstrate that nuclear CTEN regulates CDC27 expression transcriptionally and promotes cell migration through CDC27. Our findings provide new insights into CTEN moonlighting in the nucleus as a DNA-associated protein and transcriptional regulator involved in modulating cancer cell migration. (AU)


Assuntos
Humanos , Proteínas dos Microfilamentos/genética , Neoplasias , Movimento Celular , Adesão Celular/fisiologia , Subunidade Apc3 do Ciclossomo-Complexo Promotor de Anáfase , Tensinas , RNA Mensageiro/genética
2.
Iberoam. j. med ; 3(1)feb. 2021. ilus, graf
Artigo em Inglês | IBECS | ID: ibc-230972

RESUMO

Introduction: Phosphoinositides play a key role in the regulation of focal adhesions (FAs) turnover during cell adhesion and migration. However, their potential role in FA turnover at leading and trailing edge of cell are not yet fully understood. In this study, we investigate their spatial co-localisation with paxillin directly at leading and trailing edge of MDA-MB-231 breast cancer cell line. Materials and methods: Cell lines and cell culture experiments were done using MDA-MB-231human adenocarcinoma cells. Co-trnasfection and confocal microscopy were performed to visualise phosphoinositides and FAs by using GFP-C1-PLCdelta-PH/Btk-PH-GFP and 3 µɡ paxillin-RFP as biosensors. Then, ImageJ was used to measure co-localisation point between Phosphatidylinositol 4,5-trisphosphate (PtdIns(4,5)P2) or Phosphatidylinositol 3,4,5-trisphosphate (PtdIns(3,4,5)P3) and paxillin Spearman's rank correlation value was taken between PtdIns(4,5)P2/PtdIns(3,4,5)P3. Results: Our results demonstrate that the spatial co-localistion of PtdIns(4,5)P2 and PtdIns(3,4,5)P3 with FA at leading and trailing age of cell were slightly changed. Conclusions: This suggests that PtdIns(4,5)P2 and PtdIns(3,4,5)P3 play an equal role at the leading and trailing edges of the cancer metastasis through interaction with FA proteins (AU)


Assuntos
Humanos , Feminino , Fosfatidilinositóis/metabolismo , Neoplasias da Mama/patologia , Neoplasias da Mama/metabolismo , Adesão Celular
3.
Nutr. hosp ; 38(1): 121-127, ene.-feb. 2021. tab
Artigo em Inglês | IBECS | ID: ibc-198848

RESUMO

BACKGROUND: açaí is the fruit of the palm tree Euterpe oleracea Martius, which is native to the Amazon region. This fruit has been extensively studied due to its potential effects on human health. Studies have also evaluated the potential effect of açaí on the inflammatory response, but there are still few studies that have assessed this property in humans. OBJECTIVE: in this study we aimed to evaluate the effects of 200 g of açaí pulp consumption per day during four weeks on a rich panel of inflammatory biomarkers. METHODS: a prospective nutritional intervention study was conducted on forty apparently healthy women who consumed 200 g of açaí pulp per day for four weeks. A panel of serum inflammatory markers were evaluated before and after the nutritional intervention, namely, cell adhesion molecules (ICAM-1, IVAM-1, P-selectin, MCP-1, and fractalkine), interleukins (IL-1β, IL-6, IL-8, IL-10, and IL-17) and adipokines (adiponectin, leptin, visfatin, and adipsin). The data were analyzed using paired Student's t-test to evaluate the effect of the intervention using PASW Statistics, version 18.0, and a p-value of < 0.05 was considered significant. RESULTS: four weeks of açaí pulp consumption decreased p-selectin, leptin, and visfatin concentrations in the serum of the participating women. CONCLUSION: these results show that consumption of açaí pulp was able to modulate important biomarkers of the inflammatory process in apparently healthy women


INTRODUCCIÓN: el açaí es el fruto de la palmera Euterpe oleracea Martius, originaria de la región amazónica. Esta fruta ha sido ampliamente estudiada debido a sus posibles efectos sobre la salud humana. Los estudios también han evaluado el efecto potencial del açaí sobre la respuesta inflamatoria, pero todavía hay pocos estudios que hayan evaluado esta propiedad en seres humanos. OBJETIVO: en este estudio, nuestro objetivo ha sido evaluar los efectos del consumo de 200 g de pulpa de açaí por día durante cuatro semanas sobre un rico panel de biomarcadores inflamatorios. MÉTODOS: se ha realizado un estudio prospectivo de intervención nutricional en el que cuarenta mujeres aparentemente sanas han consumido 200 g de pulpa de açaí al día durante cuatro semanas. Se ha evaluado un panel de marcadores inflamatorios séricos antes y después de la intervención nutricional, a saber, moléculas de adhesión celular (ICAM-1, IVAM-1, P-selectina, MCP-1 y fractalquina), interleucinas (IL-1β, IL-6, IL-8, IL-10 e IL-17) y adipocinas (adiponectina, leptina, visfatina y adipsina). Los datos han sido analizados mediante la prueba de la t de Student pareada para evaluar el efecto de la intervención mediante el PASW Statistics, versión 18.0, y todo valor de p < 0,05 se consideró significativo. RESULTADOS: después de cuatro semanas de consumo de pulpa de açaí disminuyeron las concentraciones de p-selectina, leptina y visfatina en el suero de las mujeres participantes. CONCLUSIÓN: estos resultados muestran que el consumo de pulpa de açaí ha sido capaz de modular importantes biomarcadores del proceso inflamatorio en mujeres aparentemente sanas


Assuntos
Humanos , Feminino , Adolescente , Adulto Jovem , Adulto , Ingestão de Alimentos , Euterpe , Dietética , Selectina-P/metabolismo , Leptina/metabolismo , Nicotinamida Fosforribosiltransferase/administração & dosagem , Adesão Celular , Biomarcadores , Estudos Prospectivos , Interleucinas/sangue , Antropometria , Adipocinas
4.
Rev. osteoporos. metab. miner. (Internet) ; 12(3): 92-97, jul.-sept. 2020. tab, ilus
Artigo em Espanhol | IBECS | ID: ibc-200333

RESUMO

OBJETIVO: Los implantes óseos son utilizados cada vez con mayor frecuencia en la práctica clínica y, entre los materiales, el Ti o sus aleaciones son los de mejor rendimiento por sus propiedades fisicoquímicas. Aleaciones como TiNbTa han demostrado mejorar las características biomecánicas del Ti puro comercial (c.p.), sin embargo, su capacidad osteointegradora necesita ser evaluada. El objetivo del presente estudio fue valorar la citotoxicidad y la capacidad de adhesión, proliferación y diferenciación de células osteoblásticas en cultivo, influida por discos de material TiNbTa frente a Ti c.p. MATERIALES Y MÉTODOS: Analizamos a los 4 y 7 días del cultivo la línea celular MC3T3, la viabilidad celular (AlamarBlue Cell Viability Reagent. Invitrogen, España), así como la proliferación y diferenciación celular (actividad de fosfatasa alcalina (ALP) y microscopía electrónica de barrido (Fijación para SEM). Se realizó la prueba t de Student para determinar diferencias estadísticamente significativas entre los dos grupos de discos de estudio. RESULTADOS: Los resultados obtenidos demuestran muy buena viabilidad celular durante el periodo de estudio, sin diferencias significativas para ambos materiales. Así mismo, detectamos una caída en los niveles de ALP que fue significativa para ambos componentes entre los días 4 y 7 del estudio (p < 0,05). Las imágenes de microscopía electrónica revelaron buena capacidad de adhesión al material, así como diferenciación celular frente a ambos tipos de discos. CONCLUSIONES: La aleación de TiNbTa como material para implantes óseos cuenta con una buena capacidad osteointegradora, además de resolver problemas de biomecánica que presenta el titanio puro como componente


OBJETIVE: Bone implants are increasingly used in clinical practice and, among the materials, Ti or its alloys are offer the best performance given their physicochemical properties. Alloys such as TiNbTa have been shown to improve the biomechanical characteristics of commercial pure Ti (c.p.), however, its osseointegration capacity needs to be evaluated. The objective of the present study was to assess the cytotoxicity and the adhesion, proliferation and differentiation capacity of osteoblastic cells in culture, influenced by discs of TiNbTa material versus Ti c.p. MATERIAL AND METHODS: At 4 and 7 days after culture, we analyzed the MC3T3 cell line, cell viability (AlamarBlue Cell Viability Reagent. Invitrogen, Spain), as well as cell proliferation and differentiation (alkaline phosphatase activity (ALP) and scanning electron microscopy (Fixation for SEM) Student's t test was performed to determine statistically significant differences between the two groups of study discs. RESULTS: The results obtained show very good cell viability during the study period, with no significant differences for both materials. Likewise, we detected a drop in ALP levels that was significant for both components between days 4 and 7 of the study (p < 0.05). Electron microscopy images revealed good adhesion capacity to the material, as well as cell differentiation against both types of discs. CONCLUSIONS: The TiNbTa alloy as a material for bone implants offers good osseointegrative capacity, in addition to solving biomechanical problems that pure titanium presents as a component


Assuntos
Osseointegração , Teste de Materiais/métodos , Prótese Ancorada no Osso , Adesão Celular , Sobrevivência Celular , Materiais Biocompatíveis , Diferenciação Celular , Módulo de Elasticidade , Fosfatase Alcalina
6.
Arch. bronconeumol. (Ed. impr.) ; 52(10): 505-511, oct. 2016. graf
Artigo em Espanhol | IBECS | ID: ibc-156370

RESUMO

Introducción: El microARN (miR) se ha relacionado con la génesis tumoral en muchos tipos de cáncer, pero ningún estudio ha examinado el rol exacto del miR-133 en el cáncer de pulmón. Métodos: Identificamos el miR-133 como posible regulador de la expresión de la FOXQ1 e investigamos la posible implicación del miR-133 en la migración y la invasión de células de cáncer de pulmón, y el mecanismo molecular subyacente. Resultados: El miR-133 se dirigió directamente y redujo la expresión de la FOXQ1, que a su vez redujo la concentración de TGF-β. El miR-133 disminuyó en líneas celulares de cáncer de pulmón A549 y HCC827, y su reexpresión inhibió significativamente la migración y la invasión de células de cáncer de pulmón. Investigaciones subsiguientes revelaron que dicha inhibición estaba provocada por una inversión de la transición epitelio-mesenquimatosa, constatada por una elevación del marcador epitelial E-cadherina inducida por el miR-133 y una reducción del marcador vimentina. Conclusiones: Nuestro estudio es el primero que ha identificado el miR-133 como biomarcador del cáncer de pulmón. Su función es reducir la FOXQ1 e inhibir la transición epitelio-mesenquimatosa, la cual antagoniza la génesis tumoral en el cáncer de pulmón. Por consiguiente, nuestros datos respaldan el papel del miR-133 como posible instrumento terapéutico molecular en el tratamiento del cáncer de pulmón


Introduction: MicroRNA (miR) was implicated in the tumorigenesis of many types of cancer, but no study was conducted on the exact role of miR-133 in lung cancer. Methods: We have identified miR-133 as a putative regulator of FOXQ1 expression, and investigated the potential involvement of miR-133 in the migration and invasion of lung cancer cells, as well as the underlying molecular mechanism. Results: MiR-133 directly targeted and down-regulated FOXQ1 expression, which in turn reduced TGF-β level. MiR-133 was down-regulated in lung cancer cell lines A549 and HCC827, and its re-expression significantly inhibited the migration and invasion of the lung cancer cells. Further investigation revealed that this inhibition was caused by reversing the epithelial-mesenchymal transition, evidenced by miR-133 induced elevation of epithelial marker E-cadherin, and reduction of mesenchymal marker Vimentin. Conclusions: Our study is the first to identify miR-133 as a biomarker for lung cancer. It functions to down-regulate FOXQ1, and inhibit epithelial mesenchymal transition, which antagonizes lung cancer tumorigenesis. Therefore our data support the role of miR-133 as a potential molecular therapeutic tool in treating lung cancer


Assuntos
Humanos , Transição Epitelial-Mesenquimal/fisiologia , Fatores de Transcrição Forkhead/biossíntese , Regulação Neoplásica da Expressão Gênica , Neoplasias Pulmonares/patologia , MicroRNAs/fisiologia , Proteínas de Neoplasias/biossíntese , RNA Neoplásico/fisiologia , Caderinas , Regiões 3' não Traduzidas , Adesão Celular , Linhagem Celular Tumoral , Invasividade Neoplásica , Fator de Crescimento Transformador beta , Vimentina
7.
Rev. iberoam. micol ; 32(3): 170-179, jul.-sept. 2015. tab, ilus
Artigo em Inglês | IBECS | ID: ibc-142077

RESUMO

Background. Vulvovaginal candidiasis is a common infection among women worldwide, being Candida albicans the most commonly isolated species. Therefore, controlling this opportunistic yeast is one of the key factors for reducing nosocomial infection. Aims. We investigated several virulence properties of 28 vaginal strains of Candida isolated from Tunisian women suffering from vulvovaginitis. We also analyzed the virulence properties of a clinical Candida krusei strain and five Candida reference strains. Methods. Candida strains were subjected to microscopic analysis and culture in Candida ID2 chromogenic medium. The adhesive properties of these strains were estimated by the microtiter plate - the safranin-staining - and the Congo red agar (CRA) methods, for determining yeast ability to form biofilms on biomaterials used in urinary catheter manufacturing. Their potency to produce hydrolytic enzymes was also studied. Results. Our results showed that nine out of the total studied strains produced phospholipase. In addition, very high protease activity was detected in 23 Candida strains. All Candida strains were beta-hemolytic and adhered to polystyrene microtiter plates in varying degrees. Two vaginal C. albicans strains were strongly adhesive to polystyrene and glass slides. Also, our results showed that vaginal Candida strains were more adhesive to the three tested materials than the reference strains. Conclusions. This study shows the presence of a range of virulence and adhesion factors in clinical isolates of vaginal Candida. Consequently, control and treatment of vaginal candidiasis as a means to prevent biofilm formation on urinary catheters is of crucial importance (AU)


Antecedentes. La candidiasis vulvovaginal es una infección habitual entre las mujeres de todo el mundo. Candida albicans es la especie aislada más común, por lo que su control es un factor fundamental para reducir la infección nosocomial. Objetivos. El objetivo del presente estudio fue investigar algunas propiedades concernientes a la virulencia de 28 cepas vaginales clínicas del género Candida, procedentes de mujeres tunecinas afectadas de vulvovaginitis. También se estudiaron las propiedades de virulencia de una cepa clínica de Candida krusei y cinco cepas de referencia de Candida. Métodos. Las distintas cepas de Candida se analizaron mediante microscopía y cultivo en el medio cromogénico Candida ID2. Se estudiaron las propiedades de edhesión de las distintas cepas empleando placas de microtitulación. La capacidad de formar biopelículas sobre el material empleado en los catéteres urinarios se examinó mediante los métodos de tinción con safranina y en agar con rojo Congo. Las actividades proteasa y fosfolipasa también fueron determinadas. Resultados. De las cepas analizadas, 9 presentaron actividad fosfolipasa y en 23 cepas se detectó una alta actividad proteasa. Todas las cepas ensayadas presentaron actividad β-hemolítica y diferentes grados de adherencia a las placas de microtitulación. De las cepas de C. albicans, dos de los aislamientos vaginales mostraron una elevada adherencia al poliestireno y al vidrio. En general, los aislados vaginales mostraron una mayor adherencia que las cepas de control empleadas. Conclusiones. En este estudio se demuestra la presencia de factores de virulencia y adherencia en aislamientos clínicos vaginales de Candida. El control y el tratamiento de las candidiasis vaginales como medio para prevenir la formación de biopelículas de origen candidiásico en catéteres urinarios es de gran importancia (AU)


Assuntos
Feminino , Humanos , Candidíase Vulvovaginal/microbiologia , Fenótipo , Candida/isolamento & purificação , Candida albicans/genética , Biofilmes/crescimento & desenvolvimento , Candida albicans/isolamento & purificação , Candida/patogenicidade , Candida albicans/patogenicidade , Adesão Celular
8.
Nutr. clín. diet. hosp ; 35(3): 42-50, 2015. tab, graf
Artigo em Espanhol | IBECS | ID: ibc-145245

RESUMO

Introducción: La inducción de la molécula de adhesión intercelular-1 (ICAM-1), la molécula de adhesión a células vasculares (VCAM-1) y la E-selectina permiten la unión de las células circulantes al endotelio siendo un primer episodio en la aterogénesis. El tejido adiposo produce moléculas proinflamatorias como la IL-6 y el Factor de Necrosis Tumoral-α que inducen resistencia a la insulina (RI) y la expresión de moléculas de adhesión. Objetivo: Determinar la relación entre los niveles séricos de moléculas de adhesión (sICAM-1, sVCAM-1 y sE-selectina) y la RI, la función de la célula ß y la PCR en mujeres obesas. Métodos: Se estudió un grupo control de 19 mujeres normopeso (IMC 21,6 ± 1,8 kg/m2) y un grupo de 21 mujeres obesas (IMC 35,3 ± 5,3 kg/m2). Se midió los niveles en ayuno de sICAM-1, sVCAM-1, sE-selectina, PCR y se calculó el Modelo de Determinación de la Homeostasis de Resistencia a la Insulina (HOMA-IR) y el Modelo de Determinación de la Homeostasis de la Función de la Célula-ß (HOMA-ß). Los parámetros antropométricos y bioquímicos se midieron en ambos grupos. Resultados: Se observó correlación positiva entre las moléculas de adhesión y HOMA-IR (sICAM-1: r: 0,53, p: 0,01; sVCAM-1: r: 0,67, p: 0,0008; sE-selectina: r: 0,65, p: 0,0013) y HOMA-ß (sICAM-1: r: 0,49, p: 0,026; sVCAM-1: r: 0,46, p: 0,037; sE-selectina: r: 0,30, p: 0,041) en mujeres obesas. Se observó correlación positiva entre la insulinemia en ayuno y sICAM-1(r: 0,54, p: 0,01), sVCAM-1 (r: 0,68, p: 0,0008) y sE-selectina (r: 0,62, p: 0,0029) en mujeres obesas. Se observó correlación positiva entre los niveles séricos de PCR y sVCAM-1(r: 0,49, p: 0,02) y sE-selectina(r: 0,45, p: 0,039) en mujeres obesas. Estas correlaciónes no se observaron en mujeres normopeso. Discusión: Los resultados indican que la inflamación y los mayores niveles de HOMA-IR y HOMA-ß promueven la activación endotelial en mujeres obesas, generando un mayor riesgo de aterosclerosis. Conclusiones: Los niveles séricos de las moléculas de adhesión incrementan al aumentar la RI, la función de la célula-ß y los niveles séricos de PCR en mujeres obesas


Introduction: The induction of intercellular adhesion molecule-1 (ICAM-1), vascular cell adhesion molecule- 1 (VCAM-1), and E-selectin allows binding of circulating endothelial cells and is a first event being in atherogenesis. Adipose tissue produces proinflammatory molecules as IL-6 and Tumor Necrosis Factor-α that induce insulin resistance (RI) and the expression of adhesion molecules. Objective: To determine the relationship between serum levels of adhesion molecules (sICAM-1, sVCAM-1, and sE-selectin) with RI, the ß cell function, and CRP in obese women. Methods: 19 normal weight control women (BMI 21,6 ± 1,8 kg/m2) and a group of 21 obese women (BMI 35,3 ± 5,3 kg/m2) were recruited. Levels of sICAM-1, sVCAM-1, sE-selectin, and CRP were measured in fasting. Homeostasis model assessment of insulin resistance (HOMA-IR) and Homeostasis model assessment of b-cell function (HOMA-ß) were calculated. Anthropometric and biochemical parameters were measured in both groups. Results: A positive correlation was observed between adhesion molecules and HOMA-IR (sICAM-1: r: 0,53, p: 0,01; sVCAM-1: r: 0,67, p: 0,0008; sE-selectin: r: 0,65, p: 0,0013) and HOMA-ß (sICAM-1: r: 0,49, p: 0,026; sVCAM-1: r: 0,46, p: 0,037; sE-selectin: r: 0,30, p: 0,041) in obese women. Positive correlation was observed between fasting insulin and sICAM-1 (r: 0,54, p: 0,01), sVCAM-1 (r: 0,68, p: 0,0008) and sE-selectin (r: 0,62, p: 0,0029) in obese women. Positive correlation was observed between serum levels of CRP and sVCAM-1 (r: 0,49, p: 0,02) and sE-selectin (r: 0,45, p: 0,039) in obese women. These correlations were not observed in normal weight women. Discussion: The results indicate that inflammation and increased levels of HOMA-IR and HOMA-ß, promote endothelial activation in obese women, increasing risk of atherosclerosis. Conclusions: Serum levels of adhesion molecules increase with increasing RI, the function of beta-cell, and serum CRP levels in obese women


Assuntos
Adulto , Feminino , Humanos , Obesidade/fisiopatologia , Síndrome Metabólica/fisiopatologia , Resistência à Insulina/fisiologia , Adesão Celular/fisiologia , Mediadores da Inflamação/análise , Inflamação/fisiopatologia , Células Endoteliais/fisiologia , Proteína C-Reativa/análise , Estudos de Casos e Controles
9.
Med. oral patol. oral cir. bucal (Internet) ; 19(2): e177-e183, mar. 2014. ilus, tab
Artigo em Inglês | IBECS | ID: ibc-121358

RESUMO

OBJECTIVES: A randomized controlled trial was performed to assess soft tissue cell adhesion to implant titanium abutments subjected to different cleaning procedures and test if plasma cleaning can enhance cell adhesion at an early healing time. Study DESIGN: Eighteen patients with osseointegrated and submerged implants were included. Before re-opening, 18 abutments were divided in 3 groups corresponding to different clinical conditions with different cleaning processes: no treatment (G1), laboratory customization and cleaning by steam (G2), cleaning by plasma of Argon (G3). Abutments were removed after 1 week and scanning electron microscopy was used to analyze cell adhesion to the abutment surface quantitatively (percentage of area occupied by cells) and qualitatively (aspect of adhered cells and presence of contaminants). RESULTS: Mean percentages of area occupied by cells were 17.6 ± 22.7%, 16.5 ± 12.9% and 46.3 ± 27.9% for G1, G2 and G3 respectively. Differences were statistically significant between G1 and G3 (p = 0.030), close to significance between G2 and G3 (p = 0.056), and non-significant between G1 and G2 (p = 0.530). The proportion of samples presenting adhered cells was homogeneous among the 3 groups (p-valor = 1.000). In all cases cells presented a flattened aspect; in 2 cases cells were less efficiently adhered and in 1 case cells presented filipodia. Three cases showed contamination with cocobacteria. CONCLUSIONS: Within the limits of the present study, plasma of Argon may enhance cell adhesion to titanium abutments, even at the early stage of soft tissue healing. Further studies with greater samples are necessary to confirm these findings


Assuntos
Humanos , Titânio , Implantes Dentários , Adesão Celular , Células do Tecido Conjuntivo/fisiologia , Desinfecção/métodos , Estudos Prospectivos
10.
Med. oral patol. oral cir. bucal (Internet) ; 19(1): e8-e14, ene. 2014. graf, tab
Artigo em Inglês | IBECS | ID: ibc-118246

RESUMO

Ameloblastoma is the most common odontogenic tumor of epithelial origin, and though it is of a benign nature, it frequently infiltrates the bone, has a high rate of recurrence and could potentially become malignant. Cellular adhesion potentially plays an important role in the manifestation of these characteristics and in the tumor biology of ameloblastomas. Losses of cell-cell and extracellular matrix adhesion and cohesion are among the first events that occur in the invasion and growth of tumors of epithelial origin. The present review includes a description of the molecules that are involved in cell adhesion as reported for various types of ameloblastomas and discusses the possible roles of these molecules in the biological behaviors of this odontogenic tumor. Knowledge of the complex mechanisms in which these molecules play a role is critical for the research and discovery of future therapeutic targets


No disponible


Assuntos
Humanos , Adesão Celular , Ameloblastoma/patologia , Junções Célula-Matriz/ultraestrutura , Biomarcadores/análise , Proteínas da Matriz Extracelular/análise , Caderinas/análise
11.
Clin. transl. oncol. (Print) ; 15(2): 124-131, feb. 2013. ilus
Artigo em Inglês | IBECS | ID: ibc-127067

RESUMO

INTRODUCTION: Stromal-epithelial interactions mediate both breast development and breast cancer progression. In the present work, we evaluated the effects of conditioned media (CMs) of human adipose tissue explants from normal (hATN) and tumor (hATT) breast on proliferation, adhesion, migration and metalloproteases activity on tumor (MCF-7 and IBH-7) and non-tumor (MCF-10A) human breast epithelial cell lines. MATERIALS AND METHODS: Human adipose tissues were obtained from patients and the conditioned medium from hATN and hATT collected after 24 h of incubation. MCF-10A, MCF-7 and IBH-7 cells were grown and incubated with CMs and proliferation and adhesion, as well as migration ability and metalloprotease activity, of epithelial cells after exposing cell cultures to hATN- or hATT-CMs were quantified. The statistical significance between different experimental conditions was evaluated by one-way ANOVA. Tukey's post hoc tests were performed. RESULTS: Tumor and non-tumor breast epithelial cells significantly increased their proliferation activity after 24 h of treatment with hATT-CMs compared to control-CMs. Furthermore, cellular adhesion of these two tumor cell lines was significantly lower with hATT-CMs than with hATN-CMs. Therefore, hATT-CMs seem to induce significantly lower expression or less activity of the components involved in cellular adhesion than hATN-CMs. In addition, hATT-CMs induced pro-MMP-9 and MMP-9 activity and increased the migration of MCF-7 and IBH-7 cells compared to hATN-CMs. CONCLUSIONS: We conclude that the microenvironment of the tumor interacts in a dynamic way with the mutated epithelium. This evidence leads to the possibility to modify the tumor behavior/phenotype through the regulation or modification of its microenvironment. We developed a model in which we obtained CMs from adipose tissue explants completely, either from normal or tumor breast. In this way, we studied the contribution of soluble factors independently of the possible effects of direct cell contact (AU)


Assuntos
Humanos , Feminino , Tecido Adiposo/metabolismo , Neoplasias da Mama/metabolismo , Meios de Cultivo Condicionados/metabolismo , Células Epiteliais/metabolismo , Microambiente Tumoral/fisiologia , Tecido Adiposo/patologia , Neoplasias da Mama/patologia , Adesão Celular , Proliferação de Células , Meios de Cultivo Condicionados/farmacologia , Células Epiteliais , Células Epiteliais/patologia , Glândulas Mamárias Humanas , Glândulas Mamárias Humanas/metabolismo , Glândulas Mamárias Humanas/patologia
12.
Clin. transl. oncol. (Print) ; 14(4): 243-253, abr. 2012.
Artigo em Inglês | IBECS | ID: ibc-126184

RESUMO

Malignant mixed Müllerian tumours (malignant mixed mesodermal tumours, MMMT) of the uterus are metaplastic carcinomas with a sarcomatous component and thus they are also called carcinosarcomas. It has now been accepted that the sarcomatous component is derived from epithelial elements that have undergone metaplasia. The process that produces this metaplasia is epithelial to mesenchymal transition (EMT), which has recently been described as a neoplasia-associated programme shared with embryonic development and enabling neoplastic cells to move and metastasise. The ubiquitin proteasome system (UPS) regulates the turnover and functions of hundreds of cellular proteins. It plays important roles in EMT by being involved in the regulation of several pathways participating in the execution of this metastasis-associated programme. In this review the specifi c role of UPS in EMT of MMMT is discussed and therapeutic opportunities from UPS manipulations are proposed (AU)


Assuntos
Humanos , Masculino , Feminino , Carcinoma/metabolismo , Neoplasias do Endométrio/metabolismo , Transição Epitelial-Mesenquimal , Regulação Neoplásica da Expressão Gênica , Regulação Neoplásica da Expressão Gênica , Complexo de Endopeptidases do Proteassoma/química , Ubiquitinas/química , Adesão Celular , Citoplasma/metabolismo , Mesoderma/metabolismo , Modelos Biológicos , beta Catenina/metabolismo , Proteína Supressora de Tumor p53/metabolismo
13.
Rev. iberoam. micol ; 27(4): 195-199, oct.-dic. 2010.
Artigo em Espanhol | IBECS | ID: ibc-82963

RESUMO

Objetivo. Evaluar factores de virulencia implicados en el proceso de adhesión, como la hidrofobicidad de la superficie celular (HSC), capacidad de adherencia a plástico y a células epiteliales bucales (CEB), así como formación de biocapa, en 17 cepas de Candida albicans aisladas de aspirados bronquiales de pacientes críticos. Método. Se determinó la HSC de las cepas utilizando el método MATH, test de adheresión microbiana a hidrocarburos. El estudio de adherencia al plástico se llevó a cabo en placas de microtitulación según la técnica de Christensen. Se estudió la formación de biocapa sobre placas de microtitulación de poliestireno según el método de Ramage. La adherencia a CEB se valoró cuantificando el porcentaje de levaduras adheridas a células. Resultados. Todas las cepas estudiadas mostraron factores implicados directamente en la adherencia existiendo variabilidad en el grado de expresión de los mismos. Un 52,9% de las cepas presentaron niveles medio-altos de HSC. El 35,3% de las cepas tenían valores altos de adherencia a plástico. Las cepas más hidrofóbicas fueron las más adherentes a plástico, encontrándose un coeficiente de correlación de 0,76. De las 12 cepas productoras de biocapa, 6 de ellas eran altamente productoras. Estas cepas presentaban también altos niveles de HSC y adherencia a plástico con resultados significativos. Todas las cepas estudiadas se adhirieron a CEB dentro de un amplio rango de resultados, desde 45 a 157 lev/100 CEB, sin correlación significativa con el resto de parámetros estudiados, aunque la HSC se mostró como un requisito previo indispensable para la adherencia a células. Conclusión. La HSC es una característica variable en C. albicans y está directamente relacionada con la adherencia a plástico y con la formación de biocapa. La facilidad de valoración de la HSC nos permite su cuantificación y posibilita su utilización como indicador de la presencia de otros determinantes de patogenicidad(AU)


Objective. To evaluate virulence factors involved in the adhesion process, such as cell surface hydrophobicity (CSH), adherence to plastic capacity, adherence capacity to buccal epithelial cells (BEC), and biofilm formation, in 17 strains of C. albicans isolated from bronchial aspirates of critically ill patients. Method. The CSH of the strains of C. albicans was determined using the MATH method, a microbial adhesion to hydrocarbons test. The study of adherence to plastic was performed in microtitre plates in accordance with Christensen's technique. Biofilm formation was studied in polystyrene microtitre plates, according to the method of Ramage. Adherence to BEC was evaluated by quantifying the percentage of adhered yeasts to cells. Results. All the strains studied showed factors directly involved in adhesion, with variability in the degree of expression among them. Medium-high levels of CSH were found in 52.9% of the strains. The percentage of strains with high values in adherence to plastic was 35.3%. The most hydrophobic strains were the most adherent to plastic, with a correlation coefficient of 0.76. Of the 12 biofilm-producing strains, 6 were high producers. These strains had also high levels of CSH and adherence to plastic, with significant results. All the strains studied adhered to BEC, with results ranging widely from 45 to 157 yeasts/100 BEC, with no significant correlation with the rest of the parameters studied, although CSH was seen to be an indispensable prior requisite for adherence to cells. Conclusion. CSH is a variable characteristic in C. albicans and is directly related to adherence to plastic and biofilm formation. Ease in evaluating CSH permits its quantification, and could be used as an indicator of the presence of other determinants of pathogenicity(AU)


Assuntos
Interações Hidrofóbicas e Hidrofílicas , Virulência/fisiologia , Fatores de Virulência/análise , Candida albicans/isolamento & purificação , Candida albicans/patogenicidade , Adesão Celular/fisiologia , Microscopia/métodos , Mucosa Bucal/microbiologia , Células Epiteliais/microbiologia , Células Epiteliais , Moléculas de Adesão Celular , Leveduras/patogenicidade , Virulência/imunologia
14.
Clín. investig. arterioscler. (Ed. impr.) ; 22(5): 179-185, sept.-oct. 2010. ilus, tab, graf
Artigo em Espanhol | IBECS | ID: ibc-95226

RESUMO

Introducción La disfunción endotelial es un importante mediador de la mayor morbimortalidad cardiovascular de los pacientes diabéticos. Las células progenitoras endoteliales (EPC) parecen poseer defectos funcionales en estos pacientes. La pioglitazona aumenta el número y función de las EPC y disminuye la mortalidad cardiovascular en la población diabética. Objetivos Determinar la capacidad de adhesión de EPC cultivadas sobre arterias de pacientes diabéticos y no diabéticos, así como evaluar los efectos de la glucosa y la pioglitazona sobre estos parámetros. Material y métodos Las EPC se aislaron de células mononucleares a partir de la capa leucoplaquetaria de sangre de donantes y se cultivaron sobre fibronectina en medio microvascular. La adhesión se midió marcando las células con 111In-oxina y pasándolas ex vivo sobre una cámara de flujo con arterias mamarias internas remanentes de cirugía cardiaca. La expresión de la proteína CXCR-4 se determinó por citometría de flujo. Resultados Se observó una mayor adhesión de las EPC sobre las arterias de pacientes diabéticos. Esta adhesión disminuyó al incubar las células con glucosa a 15mM. La co-incubación con pioglitazona 1μM restauró la capacidad adhesiva de las EPC. La glucosa a 15mM disminuyó la expresión de CXCR-4 en las EPC cultivadas, en cambio, la pioglitazona a 1μM fue capaz de aumentarla. Conclusión Pese a que las arterias de pacientes diabéticos tienen una mayor capacidad de reclutar EPC, la hiperglucemia disminuye las propiedades adhesivas de estas células (AU)


Introduction Endothelial dysfunction underlies the increased cardiovascular disease burden in diabetic patients. Endothelial progenitor cell (EPC) function seems to be defective in these patients. Pioglitazone has been shown to improve the number and function of EPCs and to decrease cardiovascular mortality in the diabetic population. Objective To determine the adhesive capacity of cultured EPCs on arteries from diabetic and non-diabetic patients and evaluate the effects of high glucose and pioglitazone on this parameter. Material and methods EPCs were isolated from mononuclear cells from buffy coats, obtained from healthy blood donors. The cells were plated on fibronectin and were cultured in a microvascular medium. EPCs were labelled with 111In-oxine and adhesion was assessed using a flow chamber in which internal mammary arteries obtained from cardiac surgery (..) (AU)


Assuntos
Humanos , Células Endoteliais/fisiologia , Células-Tronco/fisiologia , Adesão Celular/fisiologia , Diabetes Mellitus/fisiopatologia , Hipoglicemiantes/farmacocinética , Hiperglicemia/fisiopatologia , Doença Arterial Periférica/fisiopatologia
15.
Rev. esp. patol ; 42(4): 249-261, oct.-dic. 2009. ilus
Artigo em Espanhol | IBECS | ID: ibc-75776

RESUMO

La matriz extracelular (MEC) representa una red tridimensionalque engloba todos los órganos, tejidos y células delorganismo. Constituye un filtro biofísico de protección, nutricióne inervación celular y el terreno para la respuesta inmune,angiogénesis, fibrosis y regeneración tisular. Y representael medio de transmisión de fuerzas mecánicas a la membranabasal, que a través de las integrinas soporta el sistema de tensegridady activa los mecanismos epigenéticos celulares. Laalteración de la MEC supone la pérdida de su función de filtroeficaz, nutrición, eliminación, denervación celular, pérdidade la capacidad de regeneración y cicatrización y alteración dela transmisión mecánica o mecanotransducción. También lapérdida del sustrato para una correcta respuesta inmune anteagentes infecciosos, tumorales y tóxicos.Los tumores son tejidos funcionales conectados y dependientesdel microambiente. El microambiente tumoral, constituidopor la MEC, células del estroma y la propia respuestainmune, son determinantes de la morfología y clasificacióntumoral, agresividad clínica, pronóstico y respuesta altratamiento del tumor. Tanto en condiciones fisiológicascomo patológicas, la comunicación recíproca entre célulasdel estroma y el parénquima dirige la expresión génica. Lacapacidad oncogénica del estroma procede tanto de losfibroblastos asociados al tumor como de la celularidad de larespuesta inmune y la alteración de la tensegridad por laMEC. La transición epitelio-mesenquimal es el cambio quetransforma una célula normal o «benigna» en «maligna». Elcitoesqueleto pseudomesenquimal otorga las propiedades demigración, invasión y diseminación. Y viceversa, el fenotipomaligno es reversible a través de la corrección de las clavesque facilita el microambiente tumoral(AU)


Extracellular matrix (ECM) is a three-dimensional networkthat envelopes all the organs, tissues and cells of thebody. A biophysical filter that provides protection, nutritionand cell innervation, it is the site for immune response,angiogenesis, fibrosis and tissue regeneration. It is also thetransport medium for mechanical forces to the basal membranethrough integrins that support the tensegrity system,activating cellular epigenetic mechanisms. The disruptionof the ECM leads to a functional loss of nutrition, elimination,cell innervation, regenerative capacity and wound healingas well as alterations in mechanical transduction. Thisloss also disrupts the immune response to pathogens,tumour cells and toxins.Tumours are functionally connected tissues whichdepend on the microenvironment. This tumour microenvironment,made up of ECM, stromal cells and the immuneresponse, determines the morphology and tumour histopathologicalclassification, clinical behaviour, prognosis andimmune response to the tumour. Both in physiological andpathological conditions, reciprocity in the communicationbetween stromal and parenchymal cells determine geneexpression. The oncogenic capacity of the stroma dependson tumour associated fibroblasts, immune system cellularityand disruption of tensegrity by ECM. Epithelialmesenchymaltransition is the change that transforms a normalor benign cell into a malignant cell. The «pseudo-mensenchymal» cytoskeleton is responsible for migration,invasion and dissemination, and vice-versa, the malignantphenotype is reversible through the correction of the microenvironmentalfactors that favour tumour growth(AU)


Assuntos
Humanos , Masculino , Feminino , Matriz Extracelular/patologia , Mecanotransdução Celular/fisiologia , Adesão Celular/fisiologia , Integrinas/administração & dosagem , Matriz Extracelular/imunologia , Matriz Extracelular/microbiologia , Matriz Extracelular , Forma do Núcleo Celular/fisiologia , Citoesqueleto/patologia
16.
Rev. esp. cardiol. (Ed. impr.) ; 62(5): 552-562, mayo 2009. ilus
Artigo em Espanhol | IBECS | ID: ibc-72667

RESUMO

El proceso de extravasación leucocitaria, un paso crucial de la respuesta inflamatoria, implica la migración de los leucocitos desde la corriente sanguínea hasta los tejidos diana donde ejercen su función efectora. La extravasación de los leucocitos está orquestada por la acción conjunta de receptores de adhesión celular y factores quimiotácticos, e implica cambios morfológicos drásticos tanto en leucocitos como en células endoteliales. De este modo, constituye un proceso activo para ambos tipos celulares que promueve la rápida y eficiente llegada de los leucocitos a los focos inflamatorios sin comprometer la integridad de la barrera endotelial. Este artículo revisa la extravasación leucocitaria, con especial hincapié en los hallazgos más recientes en este campo, tanto desde el punto de vista molecular como mecanístico. Incluye la descripción de nuevos pasos en la cascada de adhesión tales como el enlentecimiento del rodamiento, la locomoción intraluminal o la ruta alternativa de migración transcelular, así como el papel funcional de nuevos receptores de adhesión, la organización espaciotemporal de los receptores en la membrana plasmática y las rutas de señalización que controlan los diferentes estadios del proceso de extravasación (AU)


The process of leukocyte extravasation, a critical step in the inflammatory response, involves the migration of leukocytes from the bloodstream towards target tissues, where they exert their effector function. Leukocyte extravasation is orchestrated by the combined action of cellular adhesion receptors and chemotactic factors, and involves radical morphological changes in both leukocytes and endothelial cells. Thus, it constitutes an active process for both cell types and promotes the rapid and efficient influx of leukocytes to inflammatory foci without compromising the integrity of the endothelial barrier. This article provides a review of leukocyte extravasation from both molecular and mechanical points of view, with a particular emphasis on the most recent findings on the topic. It includes a description of newly revealed steps in the adhesion cascade, such as slow rolling motion, intraluminal crawling and alternative pathways for transcellular migration, and discusses the functional role of novel adhesion receptors, the spatiotemporal organization of receptors at the plasma membrane, and the signaling pathways that control different phases of the extravasation process. for transcellular migration, and discusses the functional role of novel adhesion receptors, the spatiotemporal organization of receptors at the plasma membrane and the signaling pathways that control different phases of the extravasation process (AU)


Assuntos
Humanos , Masculino , Feminino , Anti-Inflamatórios/uso terapêutico , Movimento Celular/fisiologia , Endotélio Vascular/fisiologia , Inflamação/patologia , Leucócitos/fisiologia , Anti-Inflamatórios/farmacologia , Adesão Celular , Movimento Celular , Inflamação/tratamento farmacológico , Integrinas/fisiologia , Selectinas/fisiologia
17.
Inmunología (1987) ; 27(4): 192-204, oct.-dic. 2008.
Artigo em Inglês | IBECS | ID: ibc-108109

RESUMO

Los linfocitos T y B migran continuamente desde la sangre hacia los órganos linfoides secundarios, en los cuales antígenos procedentes de tejidos periféricos son procesados y presentados por células presentadoras. Tras permanecer en estos órganos temporalmente, de no producirse el reconocimiento antigénico, los linfocitos abandonan los mismos y son devueltos a la sangre para reiniciar este patrón migratorio conocido como recirculación linfocitaria. El continuo movimiento de los linfocitos a través de estos órganos incrementa la probabilidad de que se produzca el encuentro linfocito-antígeno específico, y es por tanto imprescindible para el eficaz desarrollo de respuestas inmunitarias adaptativas. Los principales factores reguladores del tráfico linfocitario son proteínas de la familia de las quimiocinas y el lípido esfingosina-1-fosfato. Mediante la activación de receptores de membrana, estos mediadores promueven la adhesión de los linfocitos circulantes en el interior de vasos sanguíneos específicos, el acceso a los órganos linfoides, la migración en su interior, y la posterior salida a los conductos linfáticos o la sangre. El objetivo de esta revisión es repasar el estado actual del conocimiento de los mecanismos de señalización intracelular que son activados por estos receptores y que sustentan la continua recirculación linfocitar (AU)


Lymphocytes migrate from the blood stream into secondary lymphoid organs (SLO), where antigens (Ag) collected in the periphery are displayed on the surface of Ag-presenting cells. Continuous lymphocyte recirculation throughout SLO greatly increases the chances that rare Agspecific T and B cells encounter their cognate Ag, making it a prerequisite for effective immune surveillance. Members of the chemokine family of proteins, as well as the lipid mediator sphingosine-1-phosphate (S1P),are the main factors orchestrating dynamic trafficking of lymphocytes. They exert this control by activating specific receptors, which promotelymphocyte adhesion inside specific microvessels of SLO, subsequent migration inside lymphoid tissue and egress into the blood. This article covers our current understanding of the complex intracellular signaling mechanisms that are activated downstream of these receptors and contribute to lymphocyte recirculation (AU)


Assuntos
Humanos , Peptídeos e Proteínas de Sinalização Intracelular/imunologia , Quimiocinas/imunologia , Linfócitos/imunologia , Movimento Celular/imunologia , Adesão Celular/imunologia
18.
Ars pharm ; 49(3): 183-198, 2008. tab
Artigo em Es | IBECS | ID: ibc-70444

RESUMO

Objetivos: El objetivo de este estudio fue adaptar y validar el “Cuestionario para evaluar la adhesión al tratamientoantirretroviral” (CEAT-VIH) para su uso en el Perú, en pacientes VIH y SIDA en tratamiento antirretroviral degran actividad (TARGA).Métodos: Se evaluó la comprensión del cuestionario así como sus propiedades psicométricas en una muestra de 41pacientes con VIH y SIDA en tratamiento antirretroviral de gran actividad (TARGA) por más de tres meses. Elperiodo de estudio estuvo comprendido entre diciembre 2005 y enero 2006, el proceso de validación incluyó la aplicacióndel cuestionario el mismo día de la toma de muestra para el análisis de la carga viral y de los linfocitos TCD4.Se analizó la fi abilidad, la correlación de la puntuación con el recuento de linfocitos TCD4 y la carga viral.Resultados: Los resultados mostraron una adecuada fi abilidad (alfa = 0,706) y validez de criterio externa: respecto alrecuento de linfocitos TCD4 (r = 0,439, p < 0,005), y respecto a la carga viral (r = - 0,548, p < 0, 005).Conclusiones: El CEAT-VIH ha demostrado ser una adecuada herramienta para evaluar el nivel de adherencia eidentifi car los factores que infl uyen en la adherencia al tratamiento antirretroviral en una muestra de pacientesVIH y SIDA en Perú


Objective: To adapt and validate the “Assessment of Adherence to Antiretroviral Therapy Questionnary” “Cuestionariopara evaluar la adhesión al tratamiento antirretroviral” (CEAT-VIH) for use in Peru, in HIV-infected patients in highlyactive antiretroviral therapy (HAART).Method: Understanding of the questionnaire was evaluated as well as its psychometric properties in 41 HIV-infectedpatients; antiretroviral therapy for at least 3 months was required. Data was obtained between December 2005 andJanuary 2006. CEAT-VIH was carried out the day when sample for HIV viral load and CD4 cell count were taken.Reliability and validity related to two external criterions were evaluated.Results: CEAT-VIH showed appropriate reliability (alpha = 0,706) and adequate external criterion-related validity for CD4cell count (r = 0,439, p < 0.005), and for HIV viral load (r = - 0,548, p < 0, 005).Conclusions: CEAT-VIH has proved to be useful to assess the level of adherence and to identify the factors affectingpatient adherence to highly active antiretroviral therapy in Peru


Assuntos
Humanos , Feminino , Adolescente , Adulto , Pessoa de Meia-Idade , Masculino , Síndrome de Imunodeficiência Adquirida/epidemiologia , Síndrome de Imunodeficiência Adquirida/patologia , Síndrome de Imunodeficiência Adquirida/terapia , Antirretrovirais/uso terapêutico , Farmacoeconomia/tendências , Monitoramento Epidemiológico , Antirretrovirais/farmacologia , Adesão Celular/imunologia , Peru/epidemiologia
19.
Clin. transl. oncol. (Print) ; 9(4): 208-215, abr. 2007. tab, ilus
Artigo em Inglês | IBECS | ID: ibc-123294

RESUMO

Despite its decreasing incidence overall, gastric cancer is still a challenging disease. Therapy is based mainly upon surgical resection when the tumour remains localised in the stomach. Conventional chemotherapy may play a role in treating micrometastatic disease and is effective as palliative therapy for recurrent or advanced disease. However, the knowledge of molecular pathways implicated in gastric cancer pathogenesis is still in its infancy and the contribution of molecular biology to the development of new targeted therapies in gastric cancer is far behind other more common cancers such as breast, colon or lung. This review will focus first on the difference of two well defined types of gastric cancer: intestinal and diffuse. A discussion of the cell of origin of gastric cancer with some intriguing data implicating bone marrow derived cells will follow, and a comprehensive review of different genetic alterations detected in gastric cancer, underlining those that may have clinical, therapeutic or prognostic implications (AU)


Assuntos
Humanos , Masculino , Adulto , Idoso , Adesão Celular/genética , Marcadores Genéticos , Proteínas Tirosina Quinases/genética , Proteínas Tirosina Quinases/metabolismo , Neoplasias Gástricas/genética , Neoplasias Gástricas/cirurgia , Biomarcadores Tumorais/análise , Gastrectomia/métodos , Genes Supressores de Tumor , Instabilidade de Microssatélites , Mutação , Neovascularização Patológica/genética , Prognóstico , Proto-Oncogenes , Transdução de Sinais , Neoplasias Gástricas/mortalidade , Neoplasias Gástricas/patologia
20.
Rev. esp. enferm. dig ; 98(4): 265-291, abr. 2006. tab
Artigo em Es | IBECS | ID: ibc-048596

RESUMO

La enfermedad de Crohn (EC) y la colitis ulcerosa (CU) constituyenla denominada enfermedad inflamatoria crónica intestinal(EII). Los avances producidos en los últimos años en el conocimientode los mecanismo fisiopatológicos de la EII han permitidoel desarrollo de nuevos tratamientos, como son las terapias biológicas,que suponen, al menos teóricamente un manejo más especificode esta enfermedad y con menos efectos secundarios. En elmomento actual, la única terapia biológica eficaz y aceptada parael tratamiento de la EC intraluminal y fistulizante es el infliximab,tanto para inducir la remisión como para el mantenimiento de lamisma. El papel de otros anticuerpos monoclonales como el adalimumabno esta claramente establecido. Se podría perfilar comouna alternativa en los pacientes con reacciones alérgicas al infliximaby en aquellos que han perdido la respuesta al fármaco por eldesarrollo de anticuerpos al mismo. Sin embargo quedan por determinaraspectos importantes como son las dosis y al pauta deadministración. Las terapias anti-integrina α4, a pesar de los resultadosprometedores de los estudios en fase 3, no se encuentranaún disponibles por estar detenida la comercialización del fármacodebido a la comunicación de varios casos de leucoencefalopatíamultifocal progresiva. En un futuro próximo, quizá tenga gran relevanciala terapia inmunoestimulante que utiliza una nueva estrategiafrente a la enfermedad y que incluye factores estimulantes delas colonias de los granulocitos y monocitos.En la colitis ulcerosa, los resultados de los estudios ACT-1 yACT-2, han demostrado que el infliximab es un fármaco útil en eltratamiento de los brotes graves de CU sin respuesta al tratamientoestándar lo que obligará a revisar los algoritmos de tratamientoy anteponer este fármaco a la ciclosporina intravenosa. En lospróximos años, probablemente quedará definido el papel de losfármacos anti-CD3 (vilisilizumab) y de las terapias inhibidoras delos linfocitos T o del empleo de factores estimulantes de la reparacióny cicatrización epitelial


Crohn's disease (CD) and ulcerative colitis (UC) make up theso-called chronic inflammatory bowel disease (IBD). Advances inthe understanding of IBD pathophysiologic mechanisms in the lastfew years have allowed the development of novel therapies suchas biologic therapies, which at least theoretically represent a morespecific management of this disease with fewer side effects. Currently,the only effective and widely accepted biologic therapy forthe treatment of intraluminal, fistulizing CD, both for remission inductionand maintenance, is infliximab. The role of other monoclonalantibodies such as adalimumab is not clearly established. Itcould be deemed an alternative for patients with allergic reactionsto infliximab, and for those with lost response because of anti-infliximabantibody development. However, relevant issues such asdosage and administration regimen remain to be established. Antiintegrinα4 therapies, despite encouraging results in phase-3 studies,are still unavailable, as their marketing authorization was heldback in view of a number of reports regarding progressive multifocalleukoencephalopathy cases. Immunostimulating therapy maybe highly relevant in the near future, as it represents a novel strategyagainst disease with the inclusion of granulocyte-monocytecolony-stimulating factors.Regarding ulcerative colitis, results from the ACT-1 and ACT-2studies showed that infliximab is also useful for the managementof serious UC flare-ups not responding to standard treatment,which will lead to a revision of therapeutic algorithms, where thisdrug should be given preference before intravenous cyclosporine.In the next few years, the role of anti-CD3 drugs (vilisilizumab),T-cell inhibiting therapies, and epithelial repair and healing stimulatingfactors will be established


Assuntos
Humanos , Terapia Biológica , Colite Ulcerativa/terapia , Doença de Crohn/terapia , Anticorpos Monoclonais/uso terapêutico , Adesão Celular
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