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Related Concept Videos

Antigens Involved in Adaptive Immunity01:26

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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.
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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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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 gut–brain axis is a bidirectional communication system that connects the gastrointestinal tract and the brain. This interaction is mediated through multiple pathways, including the vagus nerve, hormonal signals, immune responses, and chemical messengers produced by gut microbes.Microbial Contributions to Brain FunctionGut microbiota contributes significantly to brain function by producing neuroactive compounds. These include neuroactive compounds that influence neurotransmitters such...
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Antigen Processing Pathways01:31

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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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Secondary organs, including lymph nodes, the spleen, and mucosa-associated lymphoid tissue (MALT), work harmoniously to protect us from disease and infection.
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Development of an Antigen-driven Colitis Model to Study Presentation of Antigens by Antigen Presenting Cells to T Cells
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Antigen uptake in the gut: immunologic implications.

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This summary is machine-generated.

Intestinal permeability allows large protein antigens to cross the gut barrier, even if not absorbed for nutrition. This passage may hold immunological significance for diseases.

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Area of Science:

  • Gastroenterology
  • Immunology
  • Cell Biology

Background:

  • The gastrointestinal tract primarily digests and absorbs nutrients.
  • It is commonly assumed that intraluminal protein antigens are fully digested and not transported across the epithelium.
  • However, emerging evidence suggests otherwise.

Purpose of the Study:

  • To review current understanding of small intestinal permeability to antigens.
  • To discuss the potential role of excessive macromolecule absorption in immune-mediated diseases.

Main Methods:

  • Review of experimental and clinical evidence.
  • Analysis of scientific literature on intestinal permeability and antigen transport.

Main Results:

  • Increasing evidence indicates that large antigenic molecules can penetrate the intestinal epithelial surface.
  • These molecules are absorbed in quantities of no nutritional importance.
  • Their passage may possess immunological significance.

Conclusions:

  • Small intestinal permeability to antigens is a critical area of study.
  • Excessive absorption of macromolecules might contribute to immunologically mediated clinical conditions.