Video Experimental Relacionado
Updated: Jun 20, 2026
09:46
Analyzing Murine Schwann Cell Development Along Growing Axons
Published on: November 21, 2012
Un receptor acoplado a una proteína G es esencial para que las células de Schwann inicien la mielinización
Kelly R Monk1, Stephen G Naylor, Thomas D Glenn
1Department of Developmental Biology, Stanford University School of Medicine, Stanford, CA 94305, USA.
Science (New York, N.Y.)
|September 12, 2009
Resumen
Gpr126 es crucial para la formación de la vaina de mielina en las células de Schwann. Este receptor acoplado a la proteína G eleva el monofosfato de adenosina cíclica (cAMP) para desencadenar la mielinización, esencial para la rápida conducción de la señal nerviosa.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología celular Biología celular.
- Biología del desarrollo Biología del desarrollo.
Sus antecedentes:
- La vaina de mielina permite la conducción rápida del potencial de acción en el sistema nervioso de los vertebrados.
- Las células de Schwann inician la mielinización, un proceso regulado por factores de transcripción como Oct6 y Krox20, que son activados por señales axonales.
- Los mecanismos in vivo que regulan los niveles de adenosina monofosfato cíclico (cAMP), que pueden imitar el contacto axonal in vitro, siguen sin estar claros.
Objetivo del estudio:
- Para investigar el papel del receptor acoplado a la proteína G Gpr126 en la mielinización de las células de Schwann in vivo.
- Para dilucidar las vías de señalización por las cuales Gpr126 regula la mielinización.
Principales métodos:
- Utilizó análisis mutacional en pez cebra para estudiar la función de Gpr126.
- Evaluó la expresión de los factores de transcripción Oct6 y Krox20 en células de Schwann de tipo salvaje y mutantes.
- Manipulación de los niveles de cAMP en peces cebra mutantes para observar los efectos sobre la mielinización.
Principales resultados:
- Se encontró que Gpr126 se requiere de forma autónoma en las células de Schwann para la mielinización.
- En los mutantes de gpr126, las células de Schwann no pudieron expresar Oct6 y Krox20, deteniéndose en la etapa promyelinizante.
- El aumento de los niveles de cAMP rescató la mielinización en los mutantes gpr126, pero no en los mutantes krox20.
Conclusiones:
- Gpr126 actúa en las células de Schwann para promover la mielinización elevando los niveles de cAMP.
- Esta elevación de la cAMP por Gpr126 desencadena la expresión de Oct6, impulsando la diferenciación celular de Schwann y la posterior mielinización.
- Gpr126 es un regulador clave de la transición promyelinizante a mielinizante en el sistema nervioso periférico.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:25Nervous Tissue: Myelin
The myelin sheath is a multilayered lipid and protein covering that insulates the axon of a neuron, enhancing the speed of nerve impulse conduction. Axons without this sheath are referred to as unmyelinated. Two types of neuroglia, Schwann cells in the peripheral nervous system (PNS) and oligodendrocytes in the central nervous system (CNS) are responsible for producing myelin sheaths.
Schwann cells begin to form myelin sheaths around axons during fetal development. They wrap around a small...
Schwann cells begin to form myelin sheaths around axons during fetal development. They wrap around a small...
01:30Ligand-Gated Ion Channel Receptor: Gating Mechanism
Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
01:21G-Protein Gated Ion Channels
GPCRs are primarily responsible for our sense of smell, taste, and vision. The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...
Sensory organs,...
01:15G Protein-coupled Receptors
G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
01:15G Protein-coupled Receptors
G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
01:21G-protein Coupled Receptors
G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.