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Related Concept Videos

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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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Related Experiment Video

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A High Throughput MHC II Binding Assay for Quantitative Analysis of Peptide Epitopes
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Polysaccharide processing and presentation by the MHCII pathway.

Brian A Cobb1, Qun Wang, Arthur O Tzianabos

  • 1Channing Laboratory, Department of Medicine, Brigham & Women's Hospital, Boston, MA 02115, USA.

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|May 28, 2004
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Summary
This summary is machine-generated.

Zwitterionic polysaccharides (ZPSs) activate CD4(+) T cells by being processed and presented via the MHC class II pathway. This finding challenges the traditional view of carbohydrate immune responses and T cell activation.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Microbiology

Background:

  • Adaptive immunity relies on antigen-presenting cells (APCs) and T cells.
  • MHC class I presents intracellular peptides to CD8(+) T cells; MHC class II presents extracellular peptides to CD4(+) T cells.
  • Carbohydrates were believed to elicit immune responses independent of T cells.

Purpose of the Study:

  • To investigate the mechanism by which zwitterionic polysaccharides (ZPSs) activate CD4(+) T cells.
  • To explore the role of the MHC class II pathway in ZPS-mediated T cell activation.

Main Methods:

  • Analysis of ZPS processing via a nitric oxide-mediated mechanism.
  • Investigation of ZPS presentation to T cells through the MHC class II endocytic pathway.
  • Examination of carbohydrate binding to MHC class II within APCs.

Main Results:

  • Zwitterionic polysaccharides (ZPSs) are processed into low molecular weight carbohydrates.
  • These processed carbohydrates are presented to T cells via the MHC class II endocytic pathway.
  • Carbohydrates derived from ZPSs bind to MHC class II molecules within APCs.

Conclusions:

  • ZPSs can activate CD4(+) T cells, demonstrating a T cell-dependent immune response.
  • This activation occurs through the MHC class II pathway, a novel mechanism for carbohydrate presentation.
  • Findings suggest a paradigm shift in understanding how carbohydrates modulate immune responses via T cell activation.