Video Experimental Relacionado
Updated: Jun 8, 2026

10:21
Scanning Electron Microscopy of Macerated Tissue to Visualize the Extracellular Matrix
Published on: June 14, 2016
La arquitectura molecular de las cadherinas en los desmosomas epidérmicos nativos
Ashraf Al-Amoudi1, Daniel Castaño Díez, Matthew J Betts
1European Molecular Biology Laboratory, Meyerhofstr. 1, 69117 Heidelberg, Germany.
Nature
|December 8, 2007
Resumen
Los investigadores visualizaron las cadherinas desmosomales en la piel humana utilizando tomografía criolectrónica. Esto reveló una estructura molecular detallada, explicando cómo las moléculas de cadherina interactúan para mediar la adhesión celular.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología estructural Biología estructural.
- La biofísica es la biofísica.
Sus antecedentes:
- Los desmosomas son cruciales en las uniones intercelulares en tejidos como la piel y el corazón.
- Los mecanismos moleculares precisos de la adhesión desmosomal mediada por cadherina no se comprenden completamente.
Objetivo del estudio:
- Para dilucidar la arquitectura molecular 3D de las cadherinas desmosomales en la epidermis humana.
- Para revelar la base estructural de las interacciones de la cadherina en la adhesión celular.
Principales métodos:
- Tomografía criolectrónica (Cryo-ET) de las secciones vítreas de la epidermis humana.
- Procesamiento de imágenes 3D y medición de subtomogramas.
- Ajuste del modelo atómico de la estructura de la C-cadherina.
Principales resultados:
- Se visualizó una matriz regular de densidades a lo largo de la línea media del desmosoma, que se asemeja a las estructuras de C-cadherina.
- Se reveló una disposición periódica de las interacciones trans (intercelular) y cis (intracelular) de las cadherinas.
- Desarrolló un modelo 3D de la organización de la cadherina dentro de los desmosomas.
Conclusiones:
- El estudio proporciona un detalle molecular 3D sin precedentes de la organización de la cadherina desmosomal.
- El modelo propuesto explica los datos 2D existentes y ofrece información sobre los mecanismos de adhesión basados en la cadherina.
- Este trabajo hace avanzar nuestra comprensión de la adhesión célula-célula en los tejidos epiteliales.
Videos de Conceptos Relacionados
The Extracellular Matrix
In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.Composition of the Extracellular MatrixThe extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse molecules.
Protein and Protein Structure
Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
A protein's shape is critical to its function. For example, an enzyme can...
A protein's shape is critical to its function. For example, an enzyme can...
Integrins
Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM.
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
Desmosomes
The term desmosome derives from the Greek words "desmo" and "soma" meaning "adhesion bodies." This structure was first observed during the late 1800s and described as small, dense nodules in the epidermis. Desmosomes are button-like structures that help form an interlinked network of intermediate filaments across the cells. These junctions are essential to hold cells together under mechanical stress and to maintain tissue integrity. Desmosomes are multi-protein complexes comprising desmosomal...
Reticular Dermis
The papillary and reticular dermis are the two layers of the dermis. They are made of connective tissue with fibers of collagen extending from one to the other, making the border between the two somewhat indistinct. The dermal papillae extending into the epidermis belong to the papillary layer, whereas the dense collagen fiber bundles below belong to the reticular layer.
Reticular Layer
Underlying the papillary layer is the much thicker reticular layer, composed of dense, irregular connective...
Reticular Layer
Underlying the papillary layer is the much thicker reticular layer, composed of dense, irregular connective...
Fibrous Proteins
Fibrous proteins are either long and narrow proteins or assemble to form long and thin structures. They contain repetitive units and usually consist of either alpha helices or beta sheets and, in rare cases, a mix of both. The amino acids in the primary structure often consist of repeating amino acid sequences. The role of fibrous proteins is primarily structural. Many are located in the extracellular matrix and are present in connective tissues to impart strength and joint mobility. They are...

