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Synaptic Signaling01:12

Synaptic Signaling

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.
Synaptic Signaling01:09

Synaptic Signaling

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...
Chemical Synapses01:26

Chemical 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...
Laminins are the Adhesive Proteins of Basal Lamina00:55

Laminins are the Adhesive Proteins of Basal Lamina

Laminins are heterotrimeric proteins with high molecular mass found in the extracellular matrix. Each laminin molecule is composed of three chains, viz. alpha, beta, and gamma, coded by five, four, and three paralogous genes, respectively. Laminins are categories based on the compositions of the three chains.
In humans, the five forms of alpha chains are LAMA 1, LAMA 2, LAMA 3, LAMA 4, and LAMA 5. The four forms of beta chains are LAMB 1, LAMB 2, LAMB 3, and LAMB 4. The three forms of gamma...
Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-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...
Chemical Synapses01:26

Chemical 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...

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Video Experimental Relacionado

Updated: Jul 27, 2026

Preparation of Synaptic Plasma Membrane and Postsynaptic Density Proteins Using a Discontinuous Sucrose Gradient
08:06

Preparation of Synaptic Plasma Membrane and Postsynaptic Density Proteins Using a Discontinuous Sucrose Gradient

Published on: September 3, 2014

La laminina sináptica impide la entrada de glial en la hendidura sináptica.

B L Patton1, A Y Chiu, J R Sanes

  • 1Department of Anatomy and Neurobiology, Washington University School of Medicine, St Louis, Missouri 63110, USA.

Nature
|June 26, 1998
PubMed
Resumen

Las células de Schwann, un tipo de célula glial, se impiden activamente de entrar en la hendidura sináptica. La laminina 11 en la hendidura sináptica inhibe esta invasión de células gliales, manteniendo la estabilidad de la sinapsis neuromuscular.

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Last Updated: Jul 27, 2026

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Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • Biología celular Biología celular.
  • La plasticidad sináptica.

Sus antecedentes:

  • Las sinapsis químicas requieren una oposición directa de las membranas presinápticas y postsinápticas para una rápida transferencia de información.
  • Las superficies neuronales extrasinápticas están típicamente cubiertas por células gliales, a diferencia de la hendidura sináptica.
  • Se cree que la estabilidad sináptica depende de la fuerte adhesión entre los elementos sinápticos.

Objetivo del estudio:

  • Investigar los mecanismos que mantienen la estabilidad sináptica en la sinapsis neuromuscular esquelética.
  • Identificar los factores que impiden la entrada de las células gliales (células de Schwann) en la hendidura sináptica.
  • Comprender el papel de las interacciones gliales-neuronales en el mantenimiento sináptico y la plasticidad.

Principales métodos:

  • Investigó la interacción entre las células de Schwann y la hendidura sináptica en la unión neuromuscular esquelética.
  • Componentes moleculares identificados dentro de la hendidura sináptica que regulan el comportamiento de las células gliales.
  • Examinó el papel de la laminina 11 en la inhibición de la invasión de las células de Schwann de la hendidura sináptica.

Principales resultados:

  • Las células de Schwann, las células gliales de la sinapsis neuromuscular, se inhiben activamente para que no entren en la hendidura sináptica.
  • La laminina 11, una glicoproteína concentrada en la hendidura sináptica, actúa como un componente inhibidor.
  • Esta inhibición es crucial para mantener la estructura y la estabilidad de la sinapsis neuromuscular.

Conclusiones:

  • La exclusión de las células gliales de la hendidura sináptica está regulada activamente y es esencial para el mantenimiento sináptico.
  • La laminina 11 juega un papel clave en la inhibición de la entrada de las células de Schwann en la hendidura sináptica.
  • La desregulación de esta interacción inhibidora neuronal glial puede conducir a la inestabilidad y pérdida sináptica, especialmente después de una lesión postsináptica.