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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
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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.
Complete Antigens
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Antigen Presenting Cells01:22

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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.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
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Cells of the Adaptive Immune Response01:23

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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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Antigen Processing Pathways01:31

Antigen Processing Pathways

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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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Autoimmune Disorders01:29

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Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
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The immune...
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Presentación del antígeno de las células B en la autoinmunidad del sistema nervioso central

Carson E Moseley1, Joseph J Sabatino1, Scott S Zamvil2

  • 1Department of Neurology, Weill Institute for Neurosciences, University of California, San Francisco, United States of America.

Current opinion in immunology
|August 26, 2025
PubMed
Resumen

Las células B juegan un papel crítico en la autoinmunidad del sistema nervioso central (SNC), afectando enfermedades como la esclerosis múltiple (EM). Comprender las interacciones de las células B y las células T es clave para desarrollar nuevas terapias para los trastornos autoinmunes del SNC.

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Área de la Ciencia:

  • Neuroinmunología
  • Enfermedades autoinmunes del sistema nervioso central (SNC)

Sus antecedentes:

  • El papel de las células B en la autoinmunidad del SNC se reconoció por primera vez a través de ensayos de anticuerpos anti-CD20 en la esclerosis múltiple (EM).
  • La investigación se ha ampliado para incluir la acuaporina 4 (AQP4) -IgG + neuromielitis óptica (NMO) y el trastorno asociado al anticuerpo de la glicoproteína de la mielina (MOG), destacando la participación de las células B.

Objetivo del estudio:

  • Explorar las funciones multifacéticas de las células B en las enfermedades autoinmunes del SNC más allá de la producción de autoanticuerpos.
  • Para enfatizar la importancia de las interacciones de células B-T en la patogénesis de la EM, NMO y MOGAD.

Principales métodos:

  • Revisión de la investigación existente y los datos de ensayos clínicos sobre terapias con células B en la autoinmunidad del SNC.
  • Análisis de los mecanismos inmunológicos que involucran a las células B y T en condiciones neuroinflamatorias.

Principales resultados:

  • Las células B contribuyen a la iniciación y progresión de la autoinmunidad del SNC a través de varios mecanismos.
  • Las interacciones bidireccionales entre las células B y las células T, incluida la presentación de antígenos, son cruciales.

Conclusiones:

  • Una comprensión completa de las funciones de las células B y su cooperación con las células T es esencial para avanzar en las estrategias terapéuticas.
  • Dirigirse a las interacciones de células B-T puede conducir a tratamientos más efectivos para una serie de trastornos autoinmunes del SNC.