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Related Concept Videos

Antigen Presenting Cells01:22

Antigen Presenting Cells

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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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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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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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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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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 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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Follicular dendritic cells: dynamic antigen libraries.

Balthasar A Heesters1, Riley C Myers2, Michael C Carroll2

  • 11] The Program in Cellular and Molecular Medicine, Children's Hospital Boston and Department of Pediatrics, Harvard Medical School, Boston, Massachusetts 02115, USA. [2] Department of Medical Microbiology, University Medical Center Utrecht, Utrecht 3584 CX, The Netherlands.

Nature Reviews. Immunology
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Summary
This summary is machine-generated.

Follicular dendritic cells (FDCs) actively shape antibody production and B cell memory. Understanding FDC functions is key to developing improved vaccines for protective immunity.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Follicular dendritic cells (FDCs) are crucial for high-affinity antibody production and B cell memory development.
  • Traditionally viewed as passive 'accessory' cells in germinal center (GC) responses, recent evidence highlights their active role in shaping humoral immunity.

Purpose of the Study:

  • To review recent findings on FDC antigen acquisition and retention functions.
  • To discuss the implications of FDC functions for protective immunity.
  • To explore FDC roles and development within germinal centers and secondary lymphoid organs.
  • To consider how FDC knowledge can advance next-generation vaccine design.

Main Methods:

  • Literature review of recent immunological and cell biology studies.
  • Synthesis of current understanding of FDC biology and function within germinal centers.

Main Results:

  • FDCs actively acquire and retain antigens, significantly influencing GC responses.
  • FDCs play a dynamic role in shaping the development of B cell memory and antibody affinity.
  • FDC development and function are intricately linked to the microenvironment of secondary lymphoid organs.

Conclusions:

  • FDCs are not merely accessory cells but active regulators of humoral immunity.
  • A deeper understanding of FDC mechanisms offers significant potential for improving vaccine efficacy.
  • Targeting FDC functions could lead to the development of more effective next-generation vaccines.