Video Experimental Relacionado
Updated: May 5, 2026

07:54
In vitro Synthesis of Native, Fibrous Long Spacing and Segmental Long Spacing Collagen
Published on: September 20, 2012
14.3K
La unión de las moléculas de colágeno solubles de tipo I a la membrana plasmática de los fibroblastos
Cell
|February 1, 1979
Resumen
El colágeno soluble de tipo I se une específicamente a los fibroblastos, no a las células epiteliales. Esta unión es reversible, saturable y está mediada por sitios de alta afinidad en las superficies de los fibroblastos, lo que sugiere un papel en las interacciones célula-matriz.
Área de la Ciencia:
- La bioquímica es la bioquímica.
- Biología celular Biología celular.
- Investigación de la matriz extracelular.
Sus antecedentes:
- El colágeno tipo I es un componente importante de la matriz extracelular.
- Los fibroblastos son células clave involucradas en la producción y remodelación de la matriz.
- Comprender las interacciones colágeno-célula es crucial para la ingeniería tisular y la investigación de enfermedades.
Objetivo del estudio:
- Para investigar las características de unión del colágeno soluble de tipo I a las células de cultivo.
- Para identificar los tipos de células y componentes moleculares involucrados en la unión al colágeno.
- Para explorar las implicaciones funcionales de las interacciones fibroblasto-colágeno.
Principales métodos:
- Ensayos de unión al colágeno de tipo I soluble marcado radiológicamente (125I). ensayos de unión al colágeno.
- Uso de fibroblastos humanos cultivados y células epiteliales.
- Análisis de Scatchard para determinar la afinidad de unión y el número de sitio.
- Tratamientos enzimáticos y de anticuerpos para sondear las características del sitio de unión.
Principales resultados:
- El colágeno tipo I se une selectivamente a los fibroblastos, no a las células epiteliales.
- La unión es reversible, saturable y específica para las secuencias de colágeno helicoidal.
- Los sitios de unión de alta afinidad (KD = 1.2 X 10(-11) M) están presentes, con ~500,000 sitios/fibroblasto.
- El tratamiento con fosfolipasa C mejora la unión; la tripsina la afecta mínimamente.
- La fibronectina no influye en la unión o disociación del colágeno.
Conclusiones:
- Los fibroblastos poseen receptores específicos de alta afinidad para el colágeno soluble de tipo I.
- La unión es distinta de las interacciones de la fibronectina.
- Estas interacciones pueden desempeñar un papel importante en la función de los fibroblastos y el desarrollo de los tejidos.
Videos de Conceptos Relacionados
Introduction to Fibroblasts
3.9K
Rudolph Virchow discovered spindle-shaped cells called fibroblasts in 1858. Inactive fibroblasts, called fibrocytes, become activated by various stimuli, such as growth factors and inflammatory cytokines. Activated fibroblasts play a crucial role in wound healing, inflammation, formation of new blood vessels, and cancer progression. Uncontrolled activation of fibroblasts results in fibrosis, the excess deposition of fibrous tissue, which can lead to scarring and affect normal organs. This...
3.9K
Fibril-associated Collagen
2.7K
Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...
2.7K
Fibronectins Connect Cells with ECM
2.9K
Fibronectin is an adhesive glycoprotein present in the extracellular matrix of embryogenic and adult tissue. These molecules primarily aid in regulating cell motility and attachment. A fibronectin molecule is composed of two identical polypeptide chains attached to each other by a pair of disulfide bonds at the C-terminal.
Both proteoglycans and collagen are attached to fibronectin proteins, which, in turn, are attached to integrin proteins. These integrin proteins interact with transmembrane...
Both proteoglycans and collagen are attached to fibronectin proteins, which, in turn, are attached to integrin proteins. These integrin proteins interact with transmembrane...
2.9K
Type IV Collagen of Basal Lamina
2.6K
Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions.
A type IV collagen molecule has six alpha chains which can...
A type IV collagen molecule has six alpha chains which can...
2.6K
Overview of Cell-Matrix Interactions
8.0K
The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
8.0K
Intracellular Signaling Affects Focal Adhesions
2.8K
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...
2.8K

