Video Experimental Relacionado
Updated: Jul 26, 2026
08:38
Vibrodissociation of Neurons from Rodent Brain Slices to Study Synaptic Transmission and Image Presynaptic Terminals
Published on: May 25, 2011
El análisis de mutación de la sinaptotagmina de Drosophila demuestra su papel esencial en la liberación del
J T Littleton1, M Stern, K Schulze
1Division of Neuroscience, Baylor College of Medicine, Houston, Texas 77030.
Cell
|September 24, 1993
Resumen
La sinaptotagmina (syt) es crucial para la liberación de neurotransmisores dependientes del calcio. Las mutaciones de la mosca de la fruta en el Syt interrumpen las contracciones musculares y la liberación evocada, mientras que la liberación espontánea aumenta, lo que indica vías de liberación distintas.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Biología Molecular Biología Molecular
- Genética La genética.
Sus antecedentes:
- La sinaptotagmina (syt) es una proteína de las vesículas sinápticas involucrada en la unión del calcio (Ca2+).
- Se supone que Syt media en la liberación de neurotransmisores dependientes de Ca2+.
Objetivo del estudio:
- Para investigar el papel in vivo del syt en la neurotransmisión.
- Para determinar la función de syt en la liberación de neurotransmisores dependientes de Ca2+.
Principales métodos:
- Genera mutaciones en el gen de la sinaptotagmina (syt) en las moscas de la fruta.
- Neurotransmisión probada mediante el examen de las contracciones musculares y los potenciales de unión excitatorios (EJPs).
Principales resultados:
- Los embriones que carecían de sístole mostraron una eclosión fallida y contracciones musculares no coordinadas.
- Las larvas mutantes exhibieron una reducción significativa de EJPs evocados en diferentes concentraciones de Ca2+.
- Se observó un aumento en la frecuencia espontánea de EJP en miniatura en los mutantes sistémicos.
Conclusiones:
- Proporcionó evidencia in vivo para el papel esencial de syt en la activación de Ca2+ de la liberación de neurotransmisores.
- Se han demostrado vías distintas para la liberación evocada y espontánea de neurotransmisores.
Videos de Conceptos Relacionados
01:19The Role of Ion Channels in Neuronal Computation
A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential.
01:19Ligand-gated Ion Channels
Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
01:16Calmodulin-dependent Signaling
Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
The Ca2+-CaM complex does not have enzymatic activity by itself. Instead, the complex binds downstream target proteins, including membrane proteins or enzymes,...
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...
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...