Video Experimental Relacionado
Updated: Jul 9, 2026
09:14
Labeling F-actin Barbed Ends with Rhodamine-actin in Permeabilized Neuronal Growth Cones
Published on: March 17, 2011
La F3/contactina actúa como un ligando funcional para Notch durante la maduración de los oligodendrocitos
Qi-Dong Hu1, Beng-Ti Ang, Meliha Karsak
1Department of Clinical Research, Singapore General Hospital, 169608, Singapore, Singapore.
Cell
|October 22, 2003
Resumen
La molécula de reconocimiento de células neuronales F3/contactina actúa como un ligando de Notch, promoviendo la diferenciación de los oligodendrocitos y la mielinización. Esta vía de señalización involucra Deltex1 y es crucial para el desarrollo del sistema nervioso.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología celular Biología celular.
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- Las moléculas derivadas del axón regulan la diferenciación de los oligodendrocitos a través de vías de señalización.
- La vía Jagged1/Notch1 es una señal inhibidora, pero otras vías mediadas por Notch también influyen en la diferenciación de los oligodendrocitos.
- La F3 / contactina, una molécula de reconocimiento de células neuronales, se encuentra en la región paranodal, importante para las interacciones axogliales.
Objetivo del estudio:
- Investigar el papel de la F3/contactina como un ligando funcional para la señalización de Notch.
- Para dilucidar la vía de señalización aguas abajo iniciada por la interacción F3/Notch.
- Para determinar el efecto de la señalización F3/Notch en la diferenciación y la mielinización de los oligodendrocitos.
Principales métodos:
- Se investigó la interacción de la F3/contactina con los receptores de Notch.
- Se analizó el efecto de la señalización F3 / Notch en la diferenciación de las células precursoras de oligodendrocitos (OLPC).
- Utilizó los mutantes dominantes negativos Notch1, Notch2 y Deltex1 para bloquear la señalización.
- Evaluó la regulación al alza de la proteína MAG relacionada con la mielina.
Principales resultados:
- La F3/contactina funciona como un ligando para Notch, desencadenando la translocación nuclear del dominio intracelular de Notch dependiente de la gamma-secretasa.
- La señalización F3 / Notch promueve la diferenciación de OLPC y regula la expresión de MAG en las células OLN-93.
- La vía de señalización involucra a Notch y Deltex1, como se indica por el bloqueo con mutantes dominantes negativos, pero no RBP-J o Hes1.
Conclusiones:
- La F3/contactina inicia una vía de señalización específica de Notch/Deltex1 crucial para la maduración de los oligodendrocitos.
- Esta vía promueve la mielinización, destacando el papel de la F3/contactina en el desarrollo del sistema nervioso.
- Los hallazgos revelan un nuevo mecanismo que coordina las interacciones axogliales y la formación de mielina.
Videos de Conceptos Relacionados
01:14Generation of Straight or Branched Actin Filaments
The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
03:14Notch Signaling Pathway
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
01:39Mechanism of Filopodia Formation
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
03:14Notch Signaling Pathway
The Notch signaling pathway is a major intracellular signaling pathway that is highly conserved over a broad spectrum of metazoan species. It stands unique from other intracellular signaling mechanisms in animals because notch protein itself acts as the receptor as well as the primary signaling molecule.
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
The Notch gene came into the limelight in 1914 after the discovery that its mutation in Drosophila melanogaster leads to a serrated (or "notched") wing margin phenotype. It was not until 1985...
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...
01:12Role Of Notch Signalling In Intestinal Stem Cell Renewal
Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...
Direct cell-to-cell contact is needed for the activation of Notch signaling. The signal is initiated when a notch ligand binds to a receptor on an adjacent cell, also...