Video Experimental Relacionado
Updated: Jan 6, 2026
09:33
An Optical Assay for Synaptic Vesicle Recycling in Cultured Neurons Overexpressing Presynaptic Proteins
Published on: June 26, 2018
7.9K
La señalización del neuromodulador controla bidireccionalmente el número de vesículas en las sinapsis humanas
Christopher Patzke1, Marisa M Brockmann2, Jinye Dai3
1Department of Molecular and Cellular Physiology, Stanford University School of Medicine, 265 Campus Drive, Stanford, CA 94305, USA.
Cell
|October 5, 2019
Resumen
Los investigadores descubrieron que los neuromoduladores controlan el número de vesículas sinápticas en las neuronas humanas mediante la regulación de la fosforilación de la sinapsis-1. Este mecanismo afecta la liberación de neurotransmisores y la comunicación sináptica.
Área de la Ciencia:
- La neurociencia
- Biología celular
- Biología molecular
Sus antecedentes:
- Los neuromoduladores actúan sobre los receptores acoplados a proteínas G (GPCR) para alterar los niveles intracelulares de AMP cíclico (cAMP) y de Ca2+.
- Estos procesos son cruciales para la función cerebral y están implicados en trastornos neurológicos.
Objetivo del estudio:
- Para descubrir nuevos mecanismos presinápticos que regulan la comunicación sináptica en las neuronas humanas.
- Para aclarar el papel de los neuromoduladores en el control de la dinámica de las vesículas sinápticas.
Principales métodos:
- Investigó la activación del receptor neuromodulador en las neuronas humanas.
- Cambios medidos en el número de vesículas sinápticas y en la fosforilación de la sinapsin-1.
- Se utilizó la deleción condicional de la sinapsin-1 para evaluar su papel.
Principales resultados:
- El número de vesículas sinápticas controladas bidireccionalmente por la activación del receptor neuromodulador.
- La regulación de las vesículas sinápticas está correlacionada con la fosforilación mediada por la proteína quinasa A (PKA) dependiente de la cAMP.
- El control inducido por neuromoduladores del número de vesículas fue en gran medida dependiente de la sinapsin-1.
Conclusiones:
- Un nuevo mecanismo presináptico que involucra a la sinapsis-1 regula el número de vesículas sinápticas y la liberación de neurotransmisores.
- La sinapsin-1 no fosforilada bloquea las vesículas, mientras que la fosforilación las libera, lo que demuestra un control bidireccional.
- La sinapsin-1 actúa como un efector clave de la señalización neuromoduladora en las neuronas humanas.
Videos de Conceptos Relacionados
01:20Antiepileptic Drugs: Modulators of Neurotransmitter Release Mediated by SV2A Protein
785
Antiepileptic drugs, such as levetiracetam (Keppra) and brivaracetam (Briviact), have emerged as crucial tools in managing epilepsy. These medications exert their therapeutic effects by targeting the synaptic vesicle protein SV2A, a transmembrane glycoprotein primarily found in the brain.
SV2A is a transmembrane glycoprotein located predominantly in the brain, modulating the release of neurotransmitters for neuronal communication. Both levetiracetam and brivaracetam exhibit a high affinity for...
SV2A is a transmembrane glycoprotein located predominantly in the brain, modulating the release of neurotransmitters for neuronal communication. Both levetiracetam and brivaracetam exhibit a high affinity for...
785
01:12Synaptic Signaling
79.0K
Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
79.0K
01:09Synaptic Signaling
6.5K
Neurons communicate at synapses, or junctions, to excite or inhibit the activity of other neurons or target cells, such as muscles. Synapses may be chemical or electrical.
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
Most synapses are chemical, meaning an electrical impulse or action potential spurs the release of chemical messengers called neurotransmitters. The neuron sending the signal is called the presynaptic neuron, and the neuron receiving the signal is the postsynaptic neuron.
The presynaptic neuron fires an action potential that...
6.5K
01:26Fusion of Secretory Vesicles with the Plasma Membrane
16.5K
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...
16.5K
01:29Excitatory and Inhibitory Effects of Neurotransmitters
12.4K
When an action potential reaches the presynaptic axon terminal, it releases neurotransmitters from the neuron into the synaptic cleft at a chemical synapse. The released neurotransmitter can be excitatory or inhibitory. The critical criteria commonly used to determine whether a molecule is a neurotransmitter at a chemical synapse are the molecule's presence in the presynaptic neuron. Second, its release is in response to strong presynaptic depolarization. And lastly, the presence of...
12.4K
01:26Neurochemical Transmission: Sites of Drug Action
3.4K
Neurochemical transmission, the conduction of electrical impulses between neurons mediated by neurotransmitters, plays a vital role in various physiological processes. Autonomic drugs exert their effects by modulating neurotransmission within the autonomic nervous system. For instance, drugs such as hemicholinium block the precursor uptake necessary for synthesizing acetylcholine, an essential autonomic neurotransmitter. Following synthesis, neurotransmitters are stored in vesicles. Metyrosine...
3.4K