Video Experimental Relacionado

Updated: May 5, 2026

Fractionation for Resolution of Soluble and Insoluble Huntingtin Species

Fractionation for Resolution of Soluble and Insoluble Huntingtin Species

Published on: February 27, 2018

Cambios globales en el sistema de ubiquitina en la enfermedad de Huntington

Eric J Bennett¹, Thomas A Shaler, Ben Woodman

¹Department of Biological Sciences, Stanford University, Stanford, California 94305, USA.

|August 10, 2007

Resumen

La enfermedad de Huntington (HD) implica la acumulación cerebral de cadenas de poliubiquitina, lo que indica un deterioro de la función del sistema ubiquitina-proteasoma (UPS). Esta disfunción es una característica temprana y consistente de la patología de la EH tanto en modelos de ratón como en pacientes humanos.

Área de la Ciencia:

La neurociencia es la neurociencia.
Genética La genética.
La bioquímica es la bioquímica.

Sus antecedentes:

La enfermedad de Huntington (HD) es un trastorno neurodegenerativo causado por la expansión repetida de CAG en el gen de la huntingtina (HTT).
La acumulación de ubiquitina en los cuerpos de inclusión sugiere un papel para la disfunción del metabolismo de la ubiquitina en la patogénesis de la EH.
El sistema ubiquitina-proteasoma (UPS) regula los procesos celulares críticos, pero su papel en la EH sigue siendo objeto de debate.

Objetivo del estudio:

Para investigar la función del UPS en la patogénesis de la enfermedad de Huntington.
Para determinar si la disfunción de UPS es una característica consistente de la patología de la EH.
Identificar los posibles biomarcadores de la disfunción de las SAI en la EH.

Principales métodos:

Utilizó un método basado en la espectrometría de masas para cuantificar las cadenas de poliubiquitina.
Se analizó el tejido cerebral de ratones transgénicos R6/2, modelos de ratones con EH y pacientes humanos con EH.
Se midió la abundancia de diferentes tipos de cadenas de poliubiquitina (Lys 48, Lys 63, Lys 11-vinculadas).

Principales resultados:

La acumulación de cadenas de poliubiquitina vinculadas a Lys 48 se observó temprano en la patogénesis de la EH en todos los modelos estudiados.
Esta acumulación sirve como un biomarcador endógeno fiable de la disfunción de UPS en la EH.
Las cadenas de poliubiquitina ligadas a Lys 63 y Lys 11 también se acumularon en el modelo de ratón R6/2.

Conclusiones:

La disfunción de UPS es una característica consistente y temprana de la patología de la enfermedad de Huntington.
Los cambios globales en el sistema de ubiquitina son más extensos en la EH de lo que se reconocía anteriormente.
Estos hallazgos destacan el UPS como un objetivo terapéutico potencial para la EH.

Más Videos Relacionados

In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones

In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones

Published on: July 25, 2019

Profiling Ubiquitin and Ubiquitin-like Dependent Post-translational Modifications and Identification of Significant Alterations

Profiling Ubiquitin and Ubiquitin-like Dependent Post-translational Modifications and Identification of Significant Alterations

Published on: November 7, 2019

Videos de Conceptos Relacionados

Covalently Linked Protein Regulators

Covalently Linked Protein Regulators

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....

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...

Regulated Protein Degradation

Regulated Protein Degradation

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...

Lysosomal Hydrolases

Lysosomal Hydrolases

Lysosomes are the site for the degradation of macromolecules and biological polymers released during membrane trafficking events such as secretory, endocytic, autophagic, and phagocytic pathways. The membrane-enclosed area of the lysosome, called the lumen, contains hydrolytic enzymes active in an acidic environment. These acid hydrolases are functional at a pH between 4.5 and 5 and are involved in cellular processes such as cell signaling, energy metabolism, restoration of the plasma membrane,...

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...

Huntington Disease l: Introduction

Huntington Disease l: Introduction

Huntington disease or HD is a progressive, fatal neurodegenerative disorder inherited in an autosomal dominant pattern.PathophysiologyIt is caused by expansion of the CAG trinucleotide repeat in the HTT gene on chromosome 4 (4p16.3), producing an abnormal huntingtin protein with an expanded polyglutamine tract. This misfolded protein disrupts cellular function, leading to neuronal death. Normal alleles have ≤26 repeats, 27–35 are intermediate (risk of expansion), 36–39 show...