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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 receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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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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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 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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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
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T Cells Capture Bacteria by Transinfection from Dendritic Cells
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B cells acquire antigen from target cells after synapse formation.

F D Batista1, D Iber, M S Neuberger

  • 1Medical Research Laboratory of Molecular Biology, Cambridge, UK. fdb@mrc-lmb.cam.ac.uk

Nature
|May 25, 2001
PubMed
Summary

B cells acquire membrane-bound antigens by forming a synapse with target cells. This process enhances antigen presentation to T cells, improving B cell activation and antigen recognition.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • B cells typically process soluble antigens via the B-cell antigen receptor (BCR).
  • Antigens encountered in vivo are often membrane-anchored or immobilized.
  • Existing models do not fully explain B cell interaction with membrane-bound antigens.

Purpose of the Study:

  • To investigate how B cells interact with and acquire membrane-integral antigens.
  • To elucidate the role of B-cell-target cell interactions in antigen uptake and presentation.
  • To understand the impact of synapse formation on B cell activation and T cell interaction.

Main Methods:

  • Studied B cell interactions with target cells presenting immobilized antigens.
  • Utilized microscopy to observe B-cell antigen receptor (BCR) and CD45 co-receptor dynamics at the B cell-target cell interface.
  • Analyzed antigen acquisition and subsequent T cell presentation.

Main Results:

  • B cell interaction with immobilized antigens triggers synapse formation.
  • Membrane-integral antigens are acquired from target cells via the BCR at the synapse.
  • BCR accumulates at the synapse, while CD45 co-receptor is excluded.
  • Cytoplasmic effectors polarize within the B cell towards the synapse.
  • Enhanced antigen processing and presentation to T cells occurs.

Conclusions:

  • Synapse formation is crucial for B cells to acquire membrane-bound antigens.
  • This mechanism potentiates B cell activation, especially at low antigen concentrations.
  • Context-dependent antigen recognition and improved B- and T-cell epitope linking are facilitated.