Video Experimental Relacionado

Updated: Dec 12, 2025

Rapid and Refined CD11b Magnetic Isolation of Primary Microglia with Enhanced Purity and Versatility

Rapid and Refined CD11b Magnetic Isolation of Primary Microglia with Enhanced Purity and Versatility

Published on: April 13, 2017

La ubiquitina ligasa COP1 suprime la neuroinflamación mediante la degradación de c/EBPβ en la microglia

Ada Ndoja¹, Rohit Reja², Seung-Hye Lee³

¹Department of Physiological Chemistry, Genentech, South San Francisco, CA 94080, USA.

|August 16, 2020

Resumen

COP1 normalmente suprime la actividad genética dañina en la microglía, células cruciales en la neurodegeneración como la enfermedad de Alzheimer. Su ausencia causa la acumulación de c/EBPβ, empeorando la neuroinflamación y la patología tau.

Área de la Ciencia:

La neurociencia
Inmunología
La genética

Sus antecedentes:

La microglia, las células inmunes del cerebro, están implicadas en enfermedades neurodegenerativas como la enfermedad de Alzheimer (EA).
El factor de transcripción CCAAT/proteína beta de unión al potenciador (c/EBPβ) promueve la inflamación en la microglía y está elevado en la EA.
No se comprenden completamente los mecanismos que controlan la expresión génica microglial perjudicial.

Objetivo del estudio:

Investigar el papel de la ubiquitina ligasa COP1 (RFWD2) en la regulación de la expresión génica microglial, centrándose específicamente en c/EBPβ.
Determinar el impacto de la deficiencia de COP1 en las respuestas proinflamatorias microgliales y la neurotoxicidad.
Para aclarar la función de COP1 en la contribución microglial a la neurodegeneración.

Principales métodos:

Se examinó la regulación post-traducional de c/EBPβ por COP1 en la microglía.
Se utilizaron coculturas microglia-neuronales para evaluar la neurotoxicidad, con bloqueo de anticuerpos para identificar los mediadores.
El análisis de la expresión génica y un modelo de neurodegeneración mediada por tau en ratones se emplearon para estudiar los efectos de la deficiencia de COP1 y la pérdida del alelo Cebpb.

Principales resultados:

COP1 regula los niveles de proteína c/EBPβ en la microglía.
La deficiencia de COP1 conduce a la acumulación de c/EBPβ, impulsando un programa genético proinflamatorio y neurotóxico mediado principalmente por el complemento.
La pérdida de un alelo Cebpb mitigó el fenotipo proinflamatorio.
La microglía con deficiencia de COP1 exacerbó la neurodegeneración mediada por tau in vivo.

Conclusiones:

COP1 actúa como un supresor crucial de los programas de expresión génica patógenos c/EBPβ en la microglía.
La orientación del eje COP1-c/EBPβ puede ofrecer estrategias terapéuticas para enfermedades neurodegenerativas impulsadas por la activación microglial.

Palabras clave:

C1q y C1q La COP1 El Tau c/EBPβ las microglías La neuroinflamación

Más Videos Relacionados

Development of an Insert Co-culture System of Two Cellular Types in the Absence of Cell-Cell Contact

Development of an Insert Co-culture System of Two Cellular Types in the Absence of Cell-Cell Contact

Published on: July 17, 2016

Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates

Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates

Published on: January 30, 2014

Videos de Conceptos Relacionados

Receptor Downregulation in MVBs

Receptor Downregulation in MVBs

Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...

Regulation of the Unfolded Protein Response

Regulation of the Unfolded Protein Response

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...

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...

Regulated Protein Degradation

Regulated Protein Degradation

NF-κB-dependent Signaling Pathway

NF-κB-dependent Signaling Pathway

The transcription factor NF-κB was discovered in 1986 in the lab of Nobel laureate Professor David Baltimore, for its interaction with the immunoglobulin light chain enhancer in B-cells. After more than three decades of study, it is now evident that NF-κB regulates the expression of over 100 genes. Most of these genes play an essential role in the innate and adaptive immune responses as well as the inflammatory responses of animals.
NF-κB-dependent Signaling Mechanism
The...

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...