Video Experimental Relacionado
Updated: Jul 10, 2026
10:50
Nanopodia - Thin, Fragile Membrane Projections with Roles in Cell Movement and Intercellular Interactions
Published on: April 3, 2014
ADAM y Eph: cómo las células de señalización de la efrina se desprenden
Filippo Mancia1, Lawrence Shapiro
1Department of Biochemistry and Molecular Biophysics, Columbia University, New York, New York 10032, USA.
Cell
|October 22, 2005
Resumen
Los ligandos de efrina, cruciales para la repulsión celular, pueden ser liberados de las superficies celulares. Esta liberación está mediada por un complejo que involucra al receptor de efrina y una metaloproteasa ADAM en células adyacentes.
Área de la Ciencia:
- Biología celular Biología celular.
- La señalización molecular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- Los ligandos y receptores de efrina median las interacciones célula-célula, generalmente causando repulsión.
- Estas interacciones son vitales para el desarrollo y la organización de los tejidos.
- El mecanismo preciso de la liberación de ligandos durante el contacto celular no se comprendió completamente.
Objetivo del estudio:
- Investigar el mecanismo por el cual los ligandos de efrina se liberan de la superficie celular.
- Para identificar los componentes moleculares involucrados en el derramamiento del ligando de la efrina.
Principales métodos:
- Experimentos de co-cultivo con células que expresan ligandos y receptores de efrina.
- Análisis bioquímicos para detectar y analizar los ligandos de efrina liberados.
- Análisis del papel de las metaloproteasas ADAM en la liberación de ligandos.
Principales resultados:
- Demostró que los ligandos de efrina pueden ser proteolíticamente separados de la membrana celular.
- Identificó un complejo en la célula opuesta, que comprende el receptor de efrina y una metaloproteasa ADAM, como responsable de la escisión del ligando.
- Se demostró que esta escisión facilita la liberación del ligando atado a la membrana.
Conclusiones:
- El estudio revela un nuevo mecanismo para regular la repulsión celular a través del desprendimiento de ligandos.
- La actividad del complejo del receptor de efrina-ADAM de la metaloproteasa es clave para liberar los ligandos de efrina unidos a la membrana.
- Este proceso de desprendimiento ofrece una nueva perspectiva sobre la dinámica de señalización de la efedrina en contextos biológicos.
Videos de Conceptos Relacionados
01:13Actin Polymerization and Cell Motility
Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate.
01:16Cell Motility through Blebbing
Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
In multicellular...
Blebbing Through the Matrix
In multicellular...
01:17Intracellular Signaling Affects Focal Adhesions
Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
Some...
01:03Anchoring Junctions
Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...
01:24Adherens Junctions
Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types – adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
The endothelial cells...
Adherens Junctions are Dynamic
The endothelial cells...
01:22Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal
Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.