Video Experimental Relacionado

Updated: Jul 21, 2026

Visualization of G3BP Stress Granules Dynamics in Live Primary Cells

Visualization of G3BP Stress Granules Dynamics in Live Primary Cells

Published on: May 21, 2014

Los gránulos de estrés eucarióticos se eliminan por autofagia y la función Cdc48/VCP funciona

J Ross Buchan¹, Regina-Maria Kolaitis, J Paul Taylor

¹Department of Chemistry and Biochemistry and Howard Hughes Medical Institute, University of Colorado Boulder, Boulder, CO 80303, USA.

|June 25, 2013

Resumen

Los investigadores identificaron genes que afectan a los gránulos de estrés y los cuerpos P en la levadura. Descubrieron que los gránulos de estrés se eliminan por autofagia (granulofagia), un proceso relacionado con enfermedades neurodegenerativas cuando se ven afectados.

Área de la Ciencia:

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

Sus antecedentes:

Los gránulos de estrés y los cuerpos P son gránulos RNP citoplasmáticos que regulan el ARNm.
Están involucrados en las respuestas de estrés celular y están vinculados a enfermedades neurodegenerativas.

Objetivo del estudio:

Para identificar los genes que afectan a los gránulos de estrés y la dinámica del cuerpo P.
Para investigar los mecanismos de aclaramiento de los gránulos de tensión.
Explorar el vínculo entre el aclaramiento de gránulos de estrés y las enfermedades neurodegenerativas.

Principales métodos:

Prueba genética en la levadura para identificar 125 genes relevantes.
Análisis de mutantes de levadura, incluidos los alelos CDC48.
Investigación del aclaramiento de gránulos de estrés en células de mamíferos.

Principales resultados:

Identificaron 125 genes que influyen en la dinámica del cuerpo P y/o la dinámica de los gránulos de estrés.
Se ha demostrado que los gránulos de estrés se eliminan a través de la autofagia (granulofagia).
Se ha demostrado que el deterioro de la autofagia o la función de la PCV reduce el aclaramiento de los gránulos de estrés en las células de mamíferos.

Conclusiones:

La autofagia es crucial para la eliminación de los gránulos de estrés.
La granulofagia deteriorada, potencialmente debido a mutaciones de VCP, puede contribuir a patologías relacionadas con los gránulos de RNP en enfermedades neurodegenerativas.
Dirigirse al aclaramiento autofágico de los gránulos de RNP podría ser una estrategia terapéutica para enfermedades como la ELA.

Más Videos Relacionados

Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules

Methods to Classify Cytoplasmic Foci as Mammalian Stress Granules

Published on: May 12, 2017

In-vitro Reconstitution of Bacterial Ubiquitination and VCP/p97-mediated Elimination

In-vitro Reconstitution of Bacterial Ubiquitination and VCP/p97-mediated Elimination

Published on: January 2, 2026

Videos de Conceptos Relacionados

The Proteasome

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...

Autophagy

Autophagy

Autophagy is a self-digesting process by which a cell protects itself from threats both within and outside the cell, ranging from abnormal proteins to invading bacteria. In this process, obsolete components of the cell and invading microbes are degraded by hydrolytic enzymes active in an acidic environment of the lysosomal lumen.
An autophagic pathway consists of a series of signaling events activated in response to diverse stress and physiological conditions such as food deprivation,...

The Unfolded Protein Response

The Unfolded Protein Response

The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...

Anaphase Promoting Complex

Anaphase Promoting Complex

The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...

Export of Misfolded Proteins out of the ER

Export of Misfolded Proteins out of the ER

After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...

The Proteasome

The Proteasome

Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...