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Related Concept Videos

Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

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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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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 adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
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Related Experiment Video

Updated: Jul 23, 2025

Investigating Mast Cell Secretory Granules; from Biosynthesis to Exocytosis
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Mast cells link immune sensing to antigen-avoidance behaviour.

Thomas Plum1, Rebecca Binzberger2,3, Robin Thiele2,3

  • 1Division for Cellular Immunology, German Cancer Research Center, Heidelberg, Germany. t.plum@dkfz.de.

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|July 12, 2023
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Summary
This summary is machine-generated.

Mast cells link antigen recognition to avoidance behavior, preventing harmful immune responses. This IgE-dependent mechanism stops antigen intake upon re-exposure, protecting against inflammation.

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Area of Science:

  • Immunology
  • Neuroscience
  • Behavioral Science

Background:

  • Mast cells are key players in type 2 immunity and allergic diseases, often associated with immunoglobulin E (IgE).
  • While allergic symptoms can aid in expelling harmful substances, their role in active avoidance behavior is unclear.

Purpose of the Study:

  • To identify the immunological sensor cell linking antigen recognition to avoidance behavior.
  • To elucidate the mechanisms underlying antigen-specific avoidance behavior mediated by mast cells.

Main Methods:

  • Utilized inbred mice models to study antigen-specific avoidance behavior.
  • Investigated the role of mast cells, IgE, Th2 cytokines, and leukotriene synthesis.
  • Employed mutant mice, pharmacological inhibition, neural recordings, and vagotomy to probe signaling pathways.

Main Results:

  • Antigen-specific avoidance behavior in mice critically depends on mast cells.
  • Avoidance prevented antigen-driven immune activation and inflammation in the gastrointestinal tract.
  • Mast cells in the stomach and small intestine rapidly sensed ingested antigens, signaling avoidance in an IgE-dependent manner.

Conclusions:

  • Mast cells act as immunological sensors, linking past immune responses (via IgE) to immediate avoidance behavior upon antigen re-exposure.
  • Mast cell-mediated antigen avoidance is a crucial immune mechanism to prevent harmful, continuous responses to innocuous antigens or toxins.