Video Experimental Relacionado
Updated: Jul 19, 2026
14:09
In vitro Functional Characterization of Mouse Colorectal Afferent Endings
Published on: January 21, 2015
La plasticidad sináptica en la lámina espinal I proyecta neuronas que median la hiperalgesia
Hiroshi Ikeda1, Bernhard Heinke, Ruth Ruscheweyh
1Institute of Physiology and Pathophysiology, Heidelberg University, D-69120 Heidelberg, Germany.
Science (New York, N.Y.)
|February 22, 2003
Resumen
Las afecciones de dolor crónico como la hiperalgesia implican una mayor sensibilidad al dolor. Las vías del receptor de la neurokinina 1 en las neuronas de la médula espinal facilitan sinérgicamente la potenciación a largo plazo, reteniendo rastros de memoria de eventos dolorosos.
Área de la Ciencia:
- La neurociencia es la neurociencia.
- Investigación del dolor Investigación del dolor.
- La señalización celular.
Sus antecedentes:
- La hiperalgesia duradera (mayor sensibilidad al dolor) puede ser el resultado de una inflamación, trauma o lesión nerviosa.
- Las neuronas en la lámina I del cuerno dorsal espinal que expresan el receptor de la neurokinina 1 (NK1R) para la sustancia P están implicadas en la sensibilidad anormal al dolor a través de un mecanismo desconocido.
Objetivo del estudio:
- Para dilucidar los mecanismos celulares subyacentes a la hiperalgesia mediada por el receptor de la neurokinina 1.
- Investigar la interacción sinérgica entre la señalización NK1R y los canales de calcio en la plasticidad sináptica.
Principales métodos:
- Registros electrofisiológicos en rebanadas de médula espinal.
- Análisis de las vías de señalización activadas por NK1R.
- Investigación de la implicación del canal de calcio inducida por el voltaje.
Principales resultados:
- La activación de NK1R y los canales de calcio de voltaje de bajo umbral (tipo T) facilitan sinérgicamente la potenciación sináptica a largo plazo en neuronas específicas de la lámina I.
- Esta potenciación depende de la actividad neuronal y de los niveles intracelulares de calcio.
- El mecanismo observado se produce en las neuronas que expresan NK1R, pero no en otras células nociceptivas de la lámina I.
Conclusiones:
- El estudio identifica un mecanismo celular para la hiperalgesia duradera que involucra la señalización NK1R y los canales de calcio de tipo T.
- Este mecanismo contribuye a la retención de rastros de memoria de eventos dolorosos dentro de la médula espinal.
- Los hallazgos proporcionan información sobre la base celular del dolor crónico y los posibles objetivos terapéuticos.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:40Cell-mediated Immune Responses
Overview
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...
01:12Mechanically-gated Ion Channels
Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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...
01:29Herniated Intervertebral Disc l: Introduction
Intervertebral disc herniation refers to the displacement of the nucleus pulposus (the gel-like inner core of the disc) through a tear or weakened area in the annulus fibrosus (the outer fibrous ring). The displaced disc material extends beyond the normal boundaries of the disc space and may compress or irritate nearby spinal nerve roots or, less commonly, the spinal cord.Etiology and Risk FactorsHerniation commonly results from degeneration, in which aging reduces disc hydration and...
01:23Degenerative Disc Disease ll: Pathophysiology
The symptoms of degenerative disc disease arise from a combination of mechanical compression, vascular compromise, and biochemical inflammation, which together disrupt nerve function and produce pain.Mechanical CompressionDisc degeneration reduces height and elasticity, predisposing to herniation of the nucleus pulposus, a major cause of radicular pain. Herniations may be protrusion (bulging with intact annulus), extrusion (nucleus extends beyond disc but remains connected), or sequestration...