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Videos de Conceptos Relacionados

Long-term Potentiation01:35

Long-term Potentiation

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Long-term Potentiation01:25

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
Hebbian LTP
LTP can occur when...
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Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

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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,...
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Catenins01:23

Catenins

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Catenins are characterized by multiple binding domains and dynamic structures that allow them to function as linker proteins in cell junction complexes. All catenins, except α-catenin, contain a characteristic protein sequence called the armadillo repeat and are therefore also called armadillo proteins.
Catenins in Cell Junctions
Catenins bind to cell adhesion molecules such as cadherins and link them to different cytoskeletal proteins depending on the type of cell junction. At the...
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Tension Response at Adherens Junctions01:26

Tension Response at Adherens Junctions

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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin...
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Traumatic Memory01:20

Traumatic Memory

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Emotionally traumatic events often lead to memories that are exceptionally vivid and enduring, sometimes persisting with remarkable clarity throughout an individual's life. A classic example of this phenomenon is a person who survives a car accident. Even years later, they may recall every detail of the event with startling accuracy — the screeching of the tires, the jarring impact, and the acrid smell of burning rubber. Such vividness contrasts sharply with how an individual...
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Video Experimental Relacionado

Updated: May 4, 2026

T-maze Forced Alternation and Left-right Discrimination Tasks for Assessing Working and Reference Memory in Mice
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La plasticidad dependiente de alfa-CaMKII en la corteza cerebral es necesaria para la memoria permanente.

P W Frankland1, C O'Brien, M Ohno

  • 1Departments of Neurobiology, Psychiatry and Psychology, Brain Research Institute, University of California, Los Angeles, California 90095-1761, USA.

Nature
|May 18, 2001
PubMed
Resumen

La alfa-calcio-calmodulina quinasa II (alfa-CaMKII) es crucial para la consolidación de la memoria a largo plazo en la corteza. La función alterada de alfa-CaMKII en ratones interrumpe las huellas de memoria permanente, destacando su papel en la plasticidad sináptica.

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Videos de Experimentos Relacionados

Last Updated: May 4, 2026

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Área de la Ciencia:

  • La neurociencia es la neurociencia.
  • Biología Molecular Biología Molecular
  • Ciencias Cognitivas Ciencias Cognitivas.

Sus antecedentes:

  • La plasticidad cortical es esencial para la formación de recuerdos duraderos.
  • Los mecanismos moleculares de la consolidación de la memoria en las redes corticales no se comprenden bien.

Objetivo del estudio:

  • Investigar el papel de la alfa-calcio-calmodulina quinasa II (alfa-CaMKII) en la consolidación de las memorias a largo plazo en las redes corticales.
  • Explorar los procesos moleculares y celulares que subyacen al establecimiento de la memoria permanente.

Principales métodos:

  • Utilizado heterocigótico alfa-calcio-calmodulina quinasa II en ratones mutantes nulos (alfa-CaMKII+/-). fue utilizado en ratones mutantes nulos (alfa-CaMKII+/-).
  • Aprendizaje y memoria evaluados en tareas dependientes del hipocampo en varios retrasos de retención (1-50 días).
  • Potenciación a largo plazo medida (LTP) en cortes corticales e hipocampales.

Principales resultados:

  • Los ratones alfa-CaMKII+/- exhibieron un aprendizaje normal y una memoria a corto plazo (1-3 días).
  • La memoria a largo plazo (10-50 días) se deterioró significativamente en alfa-CaMKII +/- ratones.
  • La LTP cortical se vio afectada en los ratones alfa-CaMKII+/-, mientras que la LTP del hipocampo no se vio afectada.

Conclusiones:

  • La alfa-Ca-calmodulina quinasa II juega un papel crítico en la consolidación de los recuerdos a largo plazo dentro de las redes corticales.
  • Alpha-CaMKII parece modular los eventos sinápticos necesarios para el establecimiento de huellas de memoria permanentes.
  • Estos hallazgos proporcionan información sobre los mecanismos moleculares de la consolidación de la memoria.