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Related Concept Videos

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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The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the...
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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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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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Transcytosis of IgG01:15

Transcytosis of IgG

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Transcytosis is the process in which molecules are internalized by endocytosis, transported across the cell, and released through exocytosis from the opposite end of the cell. Molecules such as insulin, immunoglobulins, and certain nutrients are transferred through the recycling endosomes by recycling and transcytosis.
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Development of Immunocompetence

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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
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Related Experiment Video

Updated: Jan 9, 2026

Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes
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Clonal persistence dominates homeostatic intestinal IgA responses.

Britta Simons1, Hieu Trong Nguyen1, Atscharah Panyot2

  • 1Institute of Molecular Medicine, RWTH Aachen University, Aachen, Germany.

Immunity
|December 2, 2025
PubMed
Summary
This summary is machine-generated.

This study reveals that immunoglobulin A (IgA) responses are shaped by the longevity of antibody-producing cell clones, not individual cells. Dynamic changes in these recurrent clones balance the stability and flexibility of the gut immune system.

Keywords:
BCR repertoireIgAPeyer’s patchesgerminal centergutmucosal immunologyplasma cells

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Last Updated: Jan 9, 2026

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Area of Science:

  • Immunology
  • Molecular Biology
  • Gastroenterology

Background:

  • Immunoglobulin A (IgA) is crucial for mucosal immunity and homeostasis.
  • Existing knowledge gaps exist regarding the temporal integration of IgA responses across different anatomical sites.
  • Gut inductive lymphoid tissues support IgA production via pathways like germinal centers.

Purpose of the Study:

  • To dissect homeostatic IgA responses by analyzing clonal repertoires.
  • To understand the temporal dynamics of IgA production from inductive sites to effector sites in the gut.
  • To elucidate the mechanisms shaping the IgA plasma cell population in the gut lamina propria.

Main Methods:

  • Analysis of clonal repertoires in gut inductive compartments.
  • Investigation of plasma cell differentiation stages in the gut lamina propria.
  • Tracking of recurrent clone diversification and seeding of the plasma cell population.

Main Results:

  • Unique clonal patterns characterize different gut inductive sites.
  • Gut plasma cell clones exhibit progressive differentiation stages.
  • Ongoing diversification of recurrent clones continuously replenishes the gut plasma cell pool.

Conclusions:

  • Clonal longevity, rather than cellular longevity, is the primary determinant of IgA responses.
  • Dynamic modulation of recurrent clones is key to balancing stability and flexibility in the gut plasma cell repertoire.
  • This provides a new perspective on maintaining mucosal immunity and gut homeostasis.