Video Experimental Relacionado
Updated: Nov 5, 2025
07:34
Induction of Intestinal Inflammation by Adoptive Transfer of CBir1 TCR Transgenic CD4+ T Cells to Immunodeficient Mice
Published on: December 16, 2021
2.9K
Desarrollo del timo de las células T específicas de la microbiota intestinal
Daniel F Zegarra-Ruiz1, Dasom V Kim1,2, Kendra Norwood3
1Immunology Program, Memorial Sloan Kettering Cancer Center, New York, NY, USA.
Nature
|May 13, 2021
Resumen
Los microbios intestinales tempranos viajan al timo a través de células dendríticas, expandiendo el repertorio de células T. Esto da forma a las respuestas inmunes, permitiendo la protección contra los patógenos y el reconocimiento de los microorganismos intestinales.
Área de la Ciencia:
- Inmunología
- Microbiología
- Biología del desarrollo
Sus antecedentes:
- El huésped humano y la microbiota mantienen una relación simbiótica, crucial para la nutrición y la defensa contra los patógenos.
- La homeostasis inmune es vital para controlar los microorganismos comensales y prevenir la inflamación.
- Si bien se conoce el reconocimiento de las células T de los microbios intestinales, la formación del timo de las células T específicas de la microbiota sigue sin estar clara.
Objetivo del estudio:
- Para investigar cómo la microbiota intestinal educa a las células T en el timo.
- Comprender el papel de los antígenos microbianos en la configuración del repertorio de células T.
Principales métodos:
- Rastreando los antígenos microbianos desde el intestino hasta el timo.
- Analizando la expansión de las células T específicas de la microbiota.
- Evaluar la función de las células T específicas de la microbiota en la periferia.
Principales resultados:
- La colonización intestinal en la vida temprana facilita el transporte de antígenos microbianos al timo por las células dendríticas.
- Esta presentación de antígeno induce la expansión de las células T específicas de la microbiota.
- Estas células T demuestran potencial patógeno o capacidad protectora contra patógenos relacionados.
Conclusiones:
- La microbiota intestinal en desarrollo da forma al repertorio de células T tímicas y periféricas.
- Las células T específicas de la microbiota son cruciales para reconocer los microorganismos y patógenos intestinales.
- La colonización microbiana temprana es crítica para el establecimiento de tolerancia y defensa inmunológica.
Videos de Conceptos Relacionados
01:22Development of Immunocompetence
554
The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
554
01:23Anatomy of the Intestines
84.7K
Although digestion of proteins, carbohydrates, and lipids may begin in the stomach, it is completed in the intestine. The absorption of nutrients, water, and electrolytes from food and drink also occurs in the intestine. The intestines can be divided into two structurally distinct organs—the small and large intestines.
Small Intestines
The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the...
Small Intestines
The small intestine is an ~7 meter-long tube with an inner diameter of just 2.5 cm. Since most nutrients are absorbed here, the inner lining of the...
84.7K
01:23Renewal of Intestinal Stem Cells
2.9K
The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
2.9K
01:16Primary Lymphoid Organs
13.0K
Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...
13.0K
01:24T Cell Types and Functions
1.7K
When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
1.7K