Video Experimental Relacionado

Updated: Mar 18, 2026

Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using χCRAC

Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using χCRAC

Published on: May 9, 2020

Transporte dependiente de la actividad del coactivador de transcripción CRTC1 desde la sinapsis al núcleo

Toh Hean Ch'ng¹, Besim Uzgil, Peter Lin

¹Department of Biological Chemistry, University of California, Los Angeles, Los Angeles, CA 90095-1737, USA.

|July 10, 2012

Resumen

La estimulación sináptica hace que el coactivador transcripcional regulado por CREB (CRTC1) se mueva de las sinapsis al núcleo en las neuronas del hipocampo. Este transporte es crucial para la formación de la memoria a largo plazo y los cambios en la expresión génica.

Área de la Ciencia:

La neurociencia es la neurociencia.
Biología Molecular Biología Molecular
Biología celular Biología celular.

Sus antecedentes:

La memoria a largo plazo se basa en la plasticidad sináptica, que requiere transcripción génica.
El transporte dependiente de la actividad de los reguladores transcripcionales vincula la actividad sináptica con la expresión génica.

Objetivo del estudio:

Investigar el papel del coactivador transcripcional regulado por CREB (CRTC1) en la plasticidad sináptica y su mecanismo de transporte.
Comprender cómo la estimulación sináptica regula la localización del CRTC1 y la actividad transcripcional.

Principales métodos:

Microscopía de inmunofluorescencia para rastrear la localización de CRTC1 en las neuronas del hipocampo.
Registros electrofisiológicos para evaluar la plasticidad sináptica.
Ensayos bioquímicos para analizar la fosforilación y las interacciones del CRTC1.

Principales resultados:

CRTC1 se localiza en las sinapsis en las neuronas en reposo y se transloca al núcleo tras la estimulación sináptica.
La translocación nuclear es específica de las neuronas excitatorias y depende de la afluencia de calcio y calcineurina.
La translocación nuclear de CRTC1 está regulada por la actividad neuronal, mientras que su persistencia nuclear está modulada por cAMP.
La actividad neuronal induce cambios complejos en la fosforilación del CRTC1, lo que sugiere una regulación génica específica del estímulo.

Conclusiones:

El transporte de CRTC1 de la sinapsis al núcleo es un mecanismo clave para la señalización dinámica de la actividad sináptica al núcleo.
CRTC1 juega un papel crítico en la expresión génica dependiente de la actividad requerida para la plasticidad y la memoria hipocampales a largo plazo.

Más Videos Relacionados

Isolation of CA1 Nuclear Enriched Fractions from Hippocampal Slices to Study Activity-dependent Nuclear Import of Synapto-nuclear Messenger Proteins

Isolation of CA1 Nuclear Enriched Fractions from Hippocampal Slices to Study Activity-dependent Nuclear Import of Synapto-nuclear Messenger Proteins

Published on: August 10, 2014

Heterokaryon Technique for Analysis of Cell Type-specific Localization

Heterokaryon Technique for Analysis of Cell Type-specific Localization

Published on: March 11, 2011

Videos de Conceptos Relacionados

Directionality of Nuclear Transport

Directionality of Nuclear Transport

Ras-related nuclear protein or Ran is a small G protein that cycles between its GTP and GDP bound states. Ran specific regulators, a Ran GTPase Activating Protein or RanGAP present in the cytosol and a Ran guanine nucleotide exchange factor or RanGEF present inside the nucleus regulate GTP/GDP exchange. A high concentration of GTP inside the cells, in addition to this asymmetric distribution of Ran-specific regulators, leads to a higher RanGTP concentration inside the nucleus. This...

Nuclear Protein Sorting

Nuclear Protein Sorting

Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...

Cotranslational Protein Translocation

Cotranslational Protein Translocation

Translocation of proteins across membranes is an ancient process that occurs even in bacteria and archaebacteria. In fact, the components of the translocation machinery are still conserved between prokaryotes and eukaryotes.
Sec61 channel partners for cotranslational translocation
During cotranslational translocation, the Sec61 channel partners with the signal recognition particle (SRP), the signal recognition particle receptor (SR), and the ribosomes to transport the nascent polypeptide chain...

Nuclear Export

Nuclear Export

The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...

Nuclear Localization Signals and Import

Nuclear Localization Signals and Import

Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of 2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...

Regulation of Nuclear Protein Sorting

Regulation of Nuclear Protein Sorting

Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...