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MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
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Immune Surveillance by NK Cells and Phagocytes01:25

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Immune surveillance is an integral part of the innate immune system, involving the continuous monitoring of peripheral tissues to detect and respond to pathogens, infected cells, or cancerous cells. This surveillance is conducted primarily by natural killer (NK) cells and phagocytes, which employ distinct but complementary mechanisms to identify and eliminate threats.
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Antigens Involved in Adaptive Immunity01:26

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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
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Cells undergoing apoptosis form apoptotic bodies that must be removed immediately to prevent inflammation, autoimmune diseases, and necrosis. Phagocytosis is carried out by professional phagocytes such as macrophages or  immature dendritic cells. Non-professional phagocytes such as  epithelial cells and fibroblasts also take part in this process; however, they are not as effective as professional phagocytes. 
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Purification of the Membrane Compartment for Endoplasmic Reticulum-associated Degradation of Exogenous Antigens in Cross-presentation
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NOX2 controla el pH fagosómico para regular el procesamiento de antígenos durante la presentación cruzada por células

Ariel Savina1, Carolina Jancic, Stephanie Hugues

  • 1Institut Curie, INSERM U653, Immunité et Cancer, 26 rue d'Ulm, 75248 Paris, Cedex 05, France.

Cell
|July 15, 2006
PubMed
Resumen

Las células dendríticas utilizan la NADPH oxidasa NOX2 para controlar el pH del fagosoma, evitando la destrucción de antígenos. Esto asegura el reconocimiento adecuado de las células T para la inmunidad adaptativa.

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Área de la Ciencia:

  • Inmunología Inmunología.
  • Biología celular Biología celular.

Sus antecedentes:

  • Las respuestas inmunitarias citotóxicas adaptativas se basan en la presentación de antígenos por las células dendríticas (DC) a las células T CD8 + a través de la presentación cruzada.
  • La degradación controlada del antígeno es crucial; la degradación excesiva en los fagosomas ácidos puede destruir los péptidos necesarios para el reconocimiento de las células T.

Objetivo del estudio:

  • Para investigar una vía fagocítica especializada en DCs que ajusta el procesamiento de antígenos.
  • Para aclarar el papel de la NADPH oxidasa NOX2 en la regulación del entorno fagosómico durante la presentación de antígenos.

Principales métodos:

  • Estudió el reclutamiento de la NADPH oxidasa NOX2 a los primeros fagosomas en DCs.
  • Evaluó el impacto de NOX2 en el pH fagosómico y la producción de especies reactivas de oxígeno.
  • Comparación de la degradación del antígeno y la eficiencia de la representación cruzada en DCs de tipo salvaje frente a DCs deficientes en NOX2.

Principales resultados:

  • NOX2 se localiza en los primeros fagosomas, mediando la producción sostenida de especies reactivas de oxígeno de bajo nivel.
  • Esta actividad de NOX2 conduce a la alcalinización de la luz fagosómica.
  • Los DC que carecen de NOX2 muestran un aumento de la acidificación fagosómica y la degradación de antígenos, lo que afecta la presentación cruzada.

Conclusiones:

  • El NOX2 es crítico para mantener un entorno fagosómico controlado en los CD, optimizando el procesamiento de antígenos para la presentación cruzada.
  • NOX2 permite que los DC funcionen como fagocitos especializados en el procesamiento de antígenos en lugar de solo como células que matan patógenos.