Video Experimental Relacionado
Updated: Jul 10, 2026
08:10
Examination of Synaptic Vesicle Recycling Using FM Dyes During Evoked, Spontaneous, and Miniature Synaptic Activities
Published on: March 31, 2014
Transporte, captura y exocitosis de vesículas sinápticas individuales en las zonas activas
D Zenisek1, J A Steyer, W Almers
1Vollum Institute, Oregon Health Sciences University, Portland 97201, USA.
Nature
|September 6, 2000
Resumen
Los terminales sinápticos reponen rápidamente las vesículas para la liberación de neurotransmisores utilizando una estructura específica. Esta estructura posiciona las vesículas para la fusión y liberación, asegurando altas tasas sostenidas de transmisión sináptica.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología celular Biología celular.
- Fisiología Sináptica Fisiología Sináptica
Sus antecedentes:
- Los terminales sinápticos requieren un reciclaje eficiente de las vesículas para mantener la neurotransmisión.
- Los mecanismos precisos de la reposición de las vesículas y el primado en las zonas activas no se comprenden completamente.
Objetivo del estudio:
- Visualizar y caracterizar la dinámica de las vesículas sinápticas individuales en la membrana plasmática de las terminales sinápticas de cinta viva.
- Aclarar el papel de estructuras específicas en el reclutamiento de las vesículas y el primado para la exocitosis.
Principales métodos:
- Imágenes en vivo de vesículas sinápticas individuales utilizando microscopía de fluorescencia en terminales sinápticas de cinta.
- Aplicación de la estimulación eléctrica para inducir y observar la exocitosis vesicular.
- Análisis del movimiento de las vesículas y la dinámica de primado cerca de la membrana plasmática.
Principales resultados:
- Se observaron vesículas sinápticas individuales en zonas activas discretas cerca de la superficie terminal.
- La estimulación eléctrica desencadenó una rápida exocitosis, evidenciada por la liberación de lípidos fluorescentes.
- Las vesículas de reserva se trasladaron a las zonas activas y estuvieron listas para su liberación en 250 ms.
- La evidencia sugiere que una estructura ancla las vesículas, facilitando la proximidad de la proteína SNARE para la fusión.
Conclusiones:
- Una estructura especializada en las zonas activas es crucial para la preparación eficiente de las vesículas sinápticas y la exocitosis.
- Esta estructura parece regular la proximidad de v-SNAREs y t-SNAREs, lo que permite la fusión rápida de las vesículas.
- Los hallazgos proporcionan nuevos conocimientos sobre la maquinaria molecular subyacente a la liberación sostenida de neurotransmisores.
Videos de Conceptos Relacionados
00:51Exocytosis
Exocytosis is used to release material from cells. Like other bulk transport mechanisms, exocytosis requires energy.
00:50Exocytosis
Exocytosis is a process that releases molecules outside the cell. Like other bulk transport mechanisms, exocytosis requires energy.
Exocytosis is the opposite of endocytosis, which brings molecules inside the cell. Sometimes, the released materials are signaling molecules. For example, neurons typically use exocytosis to release neurotransmitters. Cells also use exocytosis to insert proteins such as ion channels into their cell membranes, secrete proteins for use in the extracellular matrix, or...
Exocytosis is the opposite of endocytosis, which brings molecules inside the cell. Sometimes, the released materials are signaling molecules. For example, neurons typically use exocytosis to release neurotransmitters. Cells also use exocytosis to insert proteins such as ion channels into their cell membranes, secrete proteins for use in the extracellular matrix, or...
01:26Fusion of Secretory Vesicles with the Plasma Membrane
Proteins and neurotransmitters in secretory vesicles can be released from a cell upon vesicle docking, priming, and fusion with the plasma membrane. Vesicles are docked and primed in preparation for the quick exocytosis of their contents in response to a stimulus. The fusion process is mainly carried out by a SNAP Receptor or SNARE complex, consisting of synaptobrevin, syntaxin-1, and SNAP-25.
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
In 1993, Jim Rothman proposed that the antiparallel pairing of vesicular and transmembrane SNAREs, or...
01:45Vesicular Tubular Clusters
After budding out from the ER membrane, some COPII vesicles lose their coat and fuse with one another to form larger vesicles and interconnected tubules called vesicular tubular clusters or VTCs. These clusters constitute a compartment at the ER-Golgi interface known as ERGIC (Endoplasmic Reticulum Golgi Intermediate Compartment). The ERGIC is a mobile membrane-bound cargo transport system that sorts proteins secreted from ER and delivers them to the Golgi.
With the help of motor proteins such...
With the help of motor proteins such...
01:12Clathrin Coated Vesicles
Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
01:18Vesicular Trasport: Endocytosis, Transcytosis and Exocytosis
Vesicular transport is a cellular process that encompasses the engulfment of particles or dissolved substances by cells. It involves endocytosis, transcytosis, and exocytosis.
Endocytosis is a cellular mechanism that involves the inward folding of the cell membrane to create vesicles that capture and transport large drug molecules. This process comprises two distinct methods: pinocytosis (often referred to as "cell drinking") and phagocytosis (often referred to as "cell eating"). Pinocytosis is...
Endocytosis is a cellular mechanism that involves the inward folding of the cell membrane to create vesicles that capture and transport large drug molecules. This process comprises two distinct methods: pinocytosis (often referred to as "cell drinking") and phagocytosis (often referred to as "cell eating"). Pinocytosis is...