Video Experimental Relacionado
Updated: Jun 16, 2026
08:06
Determination of Regulatory T Cell Subsets in Murine Thymus, Pancreatic Draining Lymph Node and Spleen Using Flow Cytometry
Published on: February 27, 2019
Regulación dependiente de FOXO de la homeostasis inmunológica innata
Thomas Becker1, Gerrit Loch, Marc Beyer
1Development, Genetics & Molecular Physiology Unit, LIMES Institute, University of Bonn, Carl-Troll-Strasse 31, D-53115 Bonn, Germany.
Nature
|January 22, 2010
Resumen
El factor de transcripción FOXO activa los péptidos antimicrobianos (AMP) independientemente de las vías inmunitarias tradicionales, ofreciendo un nuevo mecanismo que vincula el metabolismo y la inmunidad innata. Este proceso conservado en humanos y Drosophila puede modular la defensa del huésped durante la escasez de energía.
Área de la Ciencia:
- La inmunidad innata es la inmunidad innata.
- El metabolismo es el metabolismo.
- La respuesta al estrés celular es la respuesta al estrés celular.
Sus antecedentes:
- Los péptidos antimicrobianos (AMP) son cruciales para la defensa del huésped contra los patógenos.
- En Drosophila, la inducción de AMP está regulada principalmente por las vías inmunitarias Toll e IMD.
- El factor de transcripción FOXO regula la resistencia al estrés, el metabolismo y el envejecimiento.
Objetivo del estudio:
- Para investigar si la activación de AMP puede ocurrir independientemente de las vías de peaje y IMD.
- Explorar el papel del factor de transcripción FOXO en la regulación de las AMP.
- Para determinar si la regulación de AMP mediada por FOXO se conserva evolutivamente.
Principales métodos:
- Estudiar la activación del gen AMP en Drosophila bajo condiciones de inanición, mutantes de señalización de insulina e inhibidores de moléculas pequeñas.
- El análisis de la expresión de AMP en foxo mutantes nulos y modelos de sobreexpresión FOXO.
- Realización de experimentos moleculares en el promotor de Drosomycin para evaluar la unión FOXO.
- Realizar estudios in vivo en Drosophila y estudios ex vivo en células humanas (pulmón, intestino, riñón, piel).
Principales resultados:
- FOXO activa directamente los genes AMP independientemente de las vías Toll e IMD.
- La inducción de AMP por FOXO ocurre en respuesta a señales metabólicas como el hambre y la señalización de insulina.
- FOXO se une directamente a la región reguladora del gen Drosomycin, induciendo la transcripción.
- Esta regulación dependiente de FOXO de las AMP se conserva en todas las especies, incluidos los humanos.
Conclusiones:
- Existe un nuevo mecanismo para la regulación cruzada entre el metabolismo y la inmunidad innata a través de FOXO.
- La activación de AMP mediada por FOXO proporciona un mecanismo de defensa durante el estrés fisiológico y la escasez de energía sin la participación de patógenos.
- Esta vía ofrece una forma de modular las respuestas inmunes, lo que potencialmente minimiza el daño al tejido del huésped durante los períodos de baja energía o estrés.
Videos de Conceptos Relacionados
01:28Inflammatory Response
An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
01:31Regulation 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...
02:26NF-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 heterodimer of NF-κB...
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
01:28Cells of the Innate Immune Response
The innate immune response is an immediate and non-specific response against pathogens, acting swiftly to prevent the spread of infections. The primary cells involved in this response are phagocytes and natural killer (NK) cells.
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
Phagocytes
Phagocytes police the peripheral tissues by removing cellular debris and responding to the invasion of foreign substances or pathogens. Many phagocytes attack and remove microorganisms even before lymphocytes detect them. The human body has two general...
02:26NF-kB-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 heterodimer of NF-κB...
NF-κB-dependent Signaling Mechanism
The heterodimer of NF-κB...
01:01Regulation of Hematopoietic Stem Cells
All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...