Video Experimental Relacionado

Updated: Jan 15, 2026

Affinity Purification of Influenza Virus Ribonucleoprotein Complexes from the Chromatin of Infected Cells

Affinity Purification of Influenza Virus Ribonucleoprotein Complexes from the Chromatin of Infected Cells

Published on: June 3, 2012

El factor de transcripción cFos, activador celular de la proteína-1, regula la replicación del virus de la influenza

Antoine Gerodez^1,2, François E Dufrasne¹, Olivier Denis³

¹National Influenza Center, Sciensano, 1180 Brussels, Belgium.

The Journal of general virology

|January 14, 2026

Resumen

Este estudio revela que cFos mejora la replicación del virus de la influenza A (IAV) al suprimir la apoptosis y la producción de interferón beta. La reducción de cFos afecta la proliferación del IAV, destacando su papel como factor proviral.

Área de la Ciencia:

Virología
Biología Molecular
Inmunología

Sus antecedentes:

El virus de la influenza A (IAV) activa factores de transcripción, incluido el factor de transcripción AP-1, durante la respuesta antiviral.
El papel específico de los miembros de la familia AP-1 en la patogénesis del IAV requiere una mayor elucidación.

Objetivo del estudio:

Investigar el papel de cFos, un factor de transcripción AP-1 clave, en el contexto de la infección por IAV en células pulmonares humanas.
Determinar los mecanismos por los cuales cFos influye en la replicación del IAV y la respuesta del huésped.

Principales métodos:

Se utilizaron células pulmonares humanas A549 para experimentos de infección por IAV.
Se emplearon técnicas de reducción de cFos para evaluar su impacto en la replicación viral.
Se realizó microscopía de fluorescencia y ensayos funcionales para analizar la localización y función de cFos.
Se cuantificó la apoptosis, los niveles de ARNm de interferón beta y la expresión de genes virales (NA, M2).

Principales resultados:

Se identificó cFos como el factor de transcripción AP-1 más sobreexpresado durante la infección por IAV.
La reducción de cFos afectó significativamente la replicación del IAV.
cFos ejerce su función proviral a través de la localización nuclear, no de la regulación de la síntesis de lípidos citoplasmáticos.
La reducción de cFos provocó un aumento de la apoptosis y niveles elevados de ARNm de interferón beta.
Se observó una reducción en el ARNm de NA viral y la expresión de proteínas virales tardías (NA, M2) tras la reducción de cFos.

Conclusiones:

cFos actúa como un factor proviral que facilita la proliferación del IAV.
cFos modula la inmunidad innata al suprimir la producción de interferón beta y mejora la supervivencia celular durante la infección por IAV.
Los hallazgos sugieren que cFos apoya la transcripción viral, contribuyendo a la replicación del IAV.

Palabras clave:

AP-1 apoptosis cFos virus de la influenza A interferón factor de transcripción

Más Videos Relacionados

The c-FOS Protein Immunohistological Detection: A Useful Tool As a Marker of Central Pathways Involved in Specific Physiological Responses In Vivo and Ex Vivo

The c-FOS Protein Immunohistological Detection: A Useful Tool As a Marker of Central Pathways Involved in Specific Physiological Responses In Vivo and Ex Vivo

Published on: April 25, 2016

Identifying Caspases and their Motifs that Cleave Proteins During Influenza A Virus Infection

Identifying Caspases and their Motifs that Cleave Proteins During Influenza A Virus Infection

Published on: July 21, 2022

Videos de Conceptos Relacionados

Leaky Scanning

Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...

RNA Polymerase II Accessory Proteins

RNA Polymerase II Accessory Proteins

Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...

Caspases

Caspases

Caspase, a family of cysteine proteases, serve as effectors in apoptosis. The ced3 gene in C.elegans was first identified to be involved in apoptosis. This gene encodes the ced-3 caspase that is similar to the interleukin-1-beta converting enzyme or ICE in mammals. In addition to apoptosis, caspases also function in the inflammatory response. Inflammatory caspases are essential in activating pro-inflammatory cytokines that recruit immune cells and block the replication of pathogens inside...

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...

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...

Co-activators and Co-repressors

Co-activators and Co-repressors

Gene transcription is regulated by the synergistic action of several proteins that form a complex at a gene regulatory site. This is observed in eukaryotes, where the regulation of gene expression is a complex process. Regulatory proteins in eukaryotes can broadly be classified into two types – regulators that bind directly to specific DNA sequences and co-regulators that associate with regulatory proteins but cannot directly bind to the DNA. These co-regulators are further divided into...