Video Experimental Relacionado
Updated: Feb 19, 2026
09:45
Method for Measuring the Activity of Deubiquitinating Enzymes in Cell Lines and Tissue Samples
Published on: May 10, 2015
10.2K
La desubiquitinasa USP2 promueve la activación de las células estrelladas hepáticas a través de la estabilización de
Seunghee Byun1, Hyunsik Kim1, Sun-Ho Lee1
1Department of Biochemistry and Molecular Biology, Severance Medical Research Institute, Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, South Korea.
FEBS letters
|February 18, 2026
Resumen
Los investigadores descubrieron que USP2 estabiliza p300, un factor clave en la fibrosis hepática. La inhibición de USP2 reduce la cicatrización del hígado al dirigirse a este mecanismo, ofreciendo una nueva estrategia terapéutica para la enfermedad hepática.
Área de la Ciencia:
- Biología Celular
- Biología Molecular
- Hepatología
Sus antecedentes:
- La activación de las células estrelladas hepáticas (CÉH) impulsa la fibrosis hepática.
- La p300, una histona acetiltransferasa, es crucial para la activación de las CÉH.
- Comprender la regulación de p300 es clave para el tratamiento de la fibrosis.
Objetivo del estudio:
- Identificar los reguladores río arriba de la estabilidad de p300 en la activación de las CÉH.
- Investigar el papel de USP2 en la fibrosis hepática.
- Explorar USP2 como una posible diana terapéutica.
Principales métodos:
- Cribado de inhibidores de desubiquitinasa en CÉH activadas.
- Secuenciación de ARN de célula única de tejidos hepáticos fibróticos humanos.
- Estudios de silenciamiento de USP2 e inhibición farmacológica.
Principales resultados:
- Se identificó USP2 como una desubiquitinasa de p300.
- USP2 se expresa en altos niveles en las CÉH y se regula al alza en la enfermedad hepática.
- USP2 estabiliza p300, promoviendo la activación de las CÉH y la fibrogénesis.
- La inhibición de USP2 suprime la acumulación de p300 y las respuestas fibróticas.
Conclusiones:
- USP2 es un regulador clave de la estabilidad de p300 y la activación de las CÉH.
- USP2 representa un nuevo mecanismo en la fibrogénesis hepática.
- USP2 es una diana terapéutica potencial para la fibrosis hepática.
Más Videos Relacionados
Videos de Conceptos Relacionados
01:37The Unfolded Protein Response
6.5K
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...
6.5K
02:04Covalently Linked Protein Regulators
9.7K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
9.7K
01:31Regulation of the Unfolded Protein Response
3.1K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
3.1K
02:58Regulated Protein Degradation
9.0K
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
9.0K
01:32Export of Misfolded Proteins out of the ER
5.3K
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...
5.3K
01:13The Proteasome
1.8K
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...
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...
1.8K