Video Experimental Relacionado

Updated: Jul 15, 2026

Isolation of Leukocytes from the Murine Tissues at the Maternal-Fetal Interface

Isolation of Leukocytes from the Murine Tissues at the Maternal-Fetal Interface

Published on: May 21, 2015

Los anticuerpos agonistas del receptor AT(1) de los pacientes preeclampticos causan que las células vasculares

R Dechend¹, V Homuth, G Wallukat

¹Franz Volhard Clinic and Max Delbrück Center for Molecular Medicine, Medical Faculty of the Charité, Humboldt University of Berlin, Germany.

|May 24, 2000

Resumen

Los autoanticuerpos dirigidos al receptor de la angiotensina-1 (AT(1)-AA) estimulan las células vasculares para expresar el factor de tejido (TF), contribuyendo potencialmente a la preeclampsia. Este estudio demuestra la acción de AT(1)-AA en las células humanas, vinculándolas a la patogénesis de la preeclampsia.

Área de la Ciencia:

Biología Cardiovascular Biología Cardiovascular
La Medicina Reproductiva es una de ellas.
Inmunología Inmunología.

Sus antecedentes:

La preeclampsia está asociada con autoanticuerpos contra el receptor de angiotensina-1 (AT(1)-AA).
Las placentas preeclampticas expresan el factor de tejido (TF), pero se desconoce el papel de AT(1)-AA en esta expresión.
Este estudio investiga si AT(1)-AA induce la expresión de TF en las células del músculo liso vascular (VSMC).

Objetivo del estudio:

Para probar la hipótesis de que AT(1)-AA hace que VSMC exprese TF.
Para dilucidar las vías de señalización involucradas en la expresión TF inducida por AT(1)-AA.
Para explorar la contribución potencial de AT(1)-AA a la patogénesis de la preeclampsia.

Principales métodos:

Purificación de IgG y AT(1)-AA de pacientes preeclampticos.
Transfección de las células con construcciones de promotor-luciferasa TF.
Detección de la cinasa relacionada con la señal extracelular (ERK) y la activación de AP-1.
Medición de la expresión de TF a través de ELISA y inmunohistoquímica.
Estudios de inhibición con el uso de losartan.

Principales resultados:

Las placentas preeclampticas mostraron una tinción de TF significativamente más alta que los controles.
AT(1) -AA específicamente unido al receptor AT(1).
Tanto la angiotensina II como la AT(1)-AA activaron ERK, AP-1 y el promotor TF en el VSMC y las células transfectadas.
La expresión de TF fue inducida en VSMC por Ang II o AT(1)-AA, efectos bloqueados por losartan.

Conclusiones:

AT(1) -AA y Ang II estimulan el receptor AT(1), iniciando una cascada de señalización que conduce a la expresión de TF.
Esta expresión de TF inducida por AT(1)-AA en células humanas puede desempeñar un papel en el desarrollo de la preeclampsia.
Los hallazgos proporcionan un mecanismo potencial que vincula los autoanticuerpos a la patogénesis de la preeclampsia.

Más Videos Relacionados

Trophoblast Cell Recovery from Angiogenesis-Tube Formation Assay for Differentiation Marker Expression Analysis

Trophoblast Cell Recovery from Angiogenesis-Tube Formation Assay for Differentiation Marker Expression Analysis

Published on: November 8, 2024

Purification of HLA-G+ Extravillous Trophoblasts from Human Term Placental Tissues for Phenotyping and Functional Analysis

Purification of HLA-G⁺ Extravillous Trophoblasts from Human Term Placental Tissues for Phenotyping and Functional Analysis

Published on: March 13, 2026

Videos de Conceptos Relacionados

Cell-mediated Immune Responses

Cell-mediated Immune Responses

Blood Transfusion and Agglutination

Blood Transfusion and Agglutination

Blood transfusion is a therapeutic measure to restore the blood volume after extensive blood loss due to an accident or a medical procedure. Blood transfusion involves drawing a certain amount of blood from a suitable donor and infusing it into the recipient.
History
The history of blood transfusion dates back to the 17th century, when early attempts were made in animals. In 1818 James Blundell, a British doctor, performed the first successful human blood transfusion. Later in 1900, Karl...

Regulation of Angiogenesis and Blood Supply

Regulation of Angiogenesis and Blood Supply

Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...

Teratogenicity

Teratogenicity

The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...

Rh Blood Group

Rh Blood Group

The Rhesus (Rh) antigen is crucial in determining blood groups and ensuring compatibility during blood transfusions.

Development of Immunocompetence

Development of Immunocompetence

The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...