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Related Experiment Videos

Sorting out self and microbial lipid antigens for CD1.

Carme Roura-Mir1, D Branch Moody

  • 1Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital and Harvard Medical School, Smith Building Room 514, 1 Jimmy Fund Way, Boston, MA 02115, USA.

Microbes and Infection
|October 14, 2003
PubMed
Summary

CD1 proteins present lipid antigens to T cells. The endosomal network concentrates these foreign lipids, enabling selective T cell activation during infections like tuberculosis.

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Area of Science:

  • Immunology
  • Cell Biology
  • Microbiology

Background:

  • CD1 proteins are crucial for T cell activation by lipid antigens.
  • Mycobacterium tuberculosis presents foreign lipid antigens during infection.
  • Myeloid cells internalize pathogens and antigens into endosomes.

Purpose of the Study:

  • To investigate the role of the endosomal network in CD1-mediated lipid antigen presentation.
  • To understand how CD1 proteins interact with lipid antigens in endosomes.

Main Methods:

  • Analysis of CD1 protein function in antigen presentation.
  • Studies on lipid antigen uptake and processing by myeloid cells.
  • Investigation of endosomal pH effects on CD1-lipid binding.

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Main Results:

  • Certain CD1 proteins show increased affinity for lipid antigens in low pH endosomal environments.
  • The endosomal network acts as a site for concentrating exogenous foreign lipid antigens.
  • Selective presentation of these concentrated antigens to T cells is facilitated.

Conclusions:

  • The endosomal network is a key compartment for efficient CD1-mediated presentation of foreign lipid antigens.
  • This mechanism is important for T cell responses against intracellular pathogens like Mycobacterium tuberculosis.