Video Experimental Relacionado
Updated: Sep 20, 2025
16:26
Regulatory T cells: Therapeutic Potential for Treating Transplant Rejection and Type I Diabetes
Published on: August 20, 2007
5.9K
Una red celular coordinada regula la tolerancia a los alimentos
Anna Rudnitsky1, Hanna Oh1, Maya Margolin1
1Department of Systems Immunology, Weizmann Institute of Science, Rehovot, Israel.
Nature
|May 27, 2025
Resumen
Una nueva investigación revela que las células RORγt+, no las células dendríticas convencionales, inducen las células T reguladoras específicas de los alimentos (pTreg). Esta vía mantiene la tolerancia intestinal, permitiendo respuestas efectoras temporales durante la infección sin interrumpir la seguridad alimentaria a largo plazo.
Área de la Ciencia:
- Inmunología
- Gastroenterología
- Microbiología
Sus antecedentes:
- La tolerancia del huésped a los antígenos de la dieta y los microbios comensales es crucial para la absorción de nutrientes y la salud intestinal.
- Las células T reguladoras periféricas (pTreg) son mediadores clave de esta tolerancia inmune.
- Anteriormente se pensaba que las células dendríticas de tipo 1 (cDC1) iniciaban la inducción de pTreg a través de la dieta.
Objetivo del estudio:
- Identificar las células específicas presentadoras de antígenos responsables de inducir las células pTreg específicas de los alimentos.
- Esclarecer el papel de las células pTreg y las cDC1 en la regulación de las respuestas de las células T CD8α durante la homeostasis y la infección.
- Comprender el circuito inmunológico que rige la tolerancia oral y su modulación durante los desafíos del huésped.
Principales métodos:
- Se investigó el papel de las células presentadoras de antígenos RORγt+ (APC) en la inducción de células pTreg específicas de los alimentos.
- Se analizó la interacción entre las células pTreg y las cDC1 en la regulación de la expansión de las células T CD8αβ.
- Se examinó el impacto de la infección y la intoxicación alimentaria en este circuito regulador.
Principales resultados:
- Las células pTreg específicas de los alimentos son inducidas exclusivamente por las APC RORγt+, no por las cDC1.
- Las interacciones pTreg-cDC1 durante la homeostasis suprimen la expansión de las células T CD8αβ específicas de los alimentos.
- La infección interrumpe esta regulación, permitiendo la expansión transitoria de las células T CD8αβ con funciones efectoras.
- Después del aclaramiento del patógeno, las células T CD8αβ de la dieta no se expanden a los antígenos de los alimentos, conservando la tolerancia.
Conclusiones:
- Un circuito distinto que involucra a las APC RORγt+ y las células T media la tolerancia a los antígenos de la dieta.
- Este circuito permite respuestas efectoras de protección transitorias durante la infección sin comprometer la tolerancia oral a largo plazo.
- Comprender esta vía es fundamental para mantener la homeostasis intestinal y el consumo seguro de alimentos.
Videos de Conceptos Relacionados
01:30Regulation of Food Intake
539
Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
539
01:20Special Features of Adaptive Immunity
1.2K
The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
1.2K
01:37Neural Regulation
40.4K
Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.
40.4K
01:25Regulation of the Digestive System
1.0K
Digestive activity regulation hinges on three primary components. Activation is prompted by a multitude of mechanical and chemical indicators, primarily detected by receptors within the stomach and intestines' walls. These receptors predominantly respond to factors such as mechanical stretching of the organ walls, changes in pH and osmolarity, and the presence of digesting materials and their by-products.
The effectors in this regulation system are glands and smooth muscles. Activation of...
The effectors in this regulation system are glands and smooth muscles. Activation of...
1.0K
01:28Global Regulatory Systems
86
Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
86
01:23Stringent Response in E. coli
62
Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
62