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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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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.
Naive T cells that have not yet encountered an antigen express two primary CD...
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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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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.
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Immunological Memory01:23

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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.
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Cytotoxic T Cells-mediated Immune Response01:27

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Updated: Jul 26, 2025

Single-cell Screening Method for the Selection and Recovery of Antibodies with Desired Specificities from Enriched Human Memory B Cell Populations
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CD62L expression marks SARS-CoV-2 memory B cell subset with preference for neutralizing epitopes.

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Potently neutralizing antibodies against SARS-CoV-2 originate from specific memory B cells (Bmem) expressing higher CD62L. This subset exhibits distinct features, advancing understanding of COVID-19 humoral immunity.

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Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) neutralizing antibodies predominantly target the spike receptor-binding domain (RBD).
  • Memory B cells (Bmem) binding the RBD exhibit heterogeneous neutralizing activities, necessitating phenotype characterization.

Purpose of the Study:

  • To identify the phenotype of Bmem cells harboring potent SARS-CoV-2 neutralizing antibodies in individuals convalescent from COVID-19.
  • To understand the immunological basis of effective humoral protection against SARS-CoV-2.

Main Methods:

  • Combined single Bmem cell profiling with functional antibody assessment.
  • Analyzed CD62L expression, epitope preference, and VH gene usage in RBD-binding Bmem cells.

Main Results:

  • A subset of neutralizing Bmem cells was identified, characterized by elevated CD62L expression.
  • This CD62L+ subset displayed distinct epitope specificities and convergent VH gene usage, correlating with neutralizing antibody titers.
  • RBD binding was equivalent between CD62L+ and CD62L- subsets, but their kinetics varied with COVID-19 severity.

Conclusions:

  • A unique phenotype of Bmem cells associated with potent SARS-CoV-2 neutralization has been revealed.
  • Elevated CD62L expression marks Bmem cells producing highly effective neutralizing antibodies.
  • This finding enhances comprehension of B cell memory and humoral immunity post-COVID-19 infection.