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Immunological Memory01:23

Immunological Memory

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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature...
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Vaccinations01:51

Vaccinations

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Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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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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Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
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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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Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Video Experimental Relacionado

Updated: Sep 26, 2025

Application of Long-term cultured Interferon-&#947; Enzyme-linked Immunospot Assay for Assessing Effector and Memory T Cell Responses in Cattle
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Aumento de la potencia y amplitud de las células B de memoria después de un aumento del ARNm del SARS-CoV-2

Frauke Muecksch1, Zijun Wang2, Alice Cho2

  • 1Laboratory of Retrovirology, The Rockefeller University, New York, NY, USA.

Nature
|April 21, 2022
PubMed
Resumen

Una tercera dosis de la vacuna de ARNm aumenta las células B de memoria específicas del dominio de unión al receptor, aumentando la potencia y amplitud de los anticuerpos. Esta respuesta inmune mejorada neutraliza eficazmente las variantes Omicron del SARS-CoV-2, protegiendo contra enfermedades graves.

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Área de la Ciencia:

  • Inmunología
  • Virología
  • Vacunología

Sus antecedentes:

  • La variante Omicron del SARS-CoV-2 puede infectar a las personas vacunadas o previamente infectadas.
  • Tres dosis de vacunas de ARNm proporcionan una alta protección contra la enfermedad grave, a pesar de la protección reducida contra la infección.

Objetivo del estudio:

  • Examinar el repertorio de células B de memoria después de tres dosis de vacunación con ARNm.
  • Comprender el impacto de la tercera dosis en la potencia y amplitud de los anticuerpos contra las variantes del SARS-CoV-2.

Principales métodos:

  • Estudio longitudinal de cohorte de individuos que recibieron tres dosis de la vacuna de ARNm.
  • Análisis de las células B de memoria específicas del dominio de unión al receptor (RBD) y sus anticuerpos codificados.

Principales resultados:

  • La tercera dosis de la vacuna de ARNm aumentó y evolucionó las células B de memoria específicas de la RBD.
  • Los anticuerpos de estas células mostraron una mayor potencia y amplitud, con nuevos clones dirigidos a regiones de RBD conservadas.
  • Más del 50% de los anticuerpos neutralizantes analizados neutralizaron la variante Omicron después de la tercera dosis.

Conclusiones:

  • Tres dosis de la vacuna de ARNm inducen un repertorio diverso de células B de memoria capaces de responder a las variantes del SARS-CoV-2 como el Omicron.
  • Esta respuesta inmune mejorada explica la eficacia de una tercera dosis contra la enfermedad severa inducida por la variante.