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Related Experiment Videos

CD1c molecules broadly survey the endocytic system.

M Sugita1, N van Der Wel, R A Rogers

  • 1Lymphocyte Biology Section, Division of Rheumatology, Immunology and Allergy, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115, USA.

Proceedings of the National Academy of Sciences of the United States of America
|July 13, 2000
PubMed
Summary

CD1c molecules uniquely survey the entire endocytic system for lipid antigens, unlike other antigen-presenting molecules. This broad sampling and independence from acidic environments enhance microbe detection by antigen-presenting cells.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Antigen-presenting cells (APCs) detect microbes by sampling intracellular compartments.
  • Major histocompatibility complex (MHC) class I and II present peptide antigens from cytosol and late endosomes.
  • CD1a and CD1b present lipid antigens from early recycling endosomes and late endocytic compartments, respectively.

Purpose of the Study:

  • To investigate the intracellular distribution and antigen-presentation capabilities of CD1c.
  • To compare CD1c's sampling and functional requirements with other CD1 isoforms and MHC molecules.

Main Methods:

  • Immunofluorescence microscopy to determine CD1c localization within the endocytic system.
  • Functional assays assessing antigen presentation by CD1c under varying pH conditions.

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Main Results:

  • CD1c distributes broadly across the endocytic system, including recycling endosomes and late endocytic compartments.
  • Unlike CD1b, CD1c-mediated antigen presentation is not dependent on acidic vesicular environments.
  • CD1c is expressed on APCs like Langerhans cells and B cells, sometimes in the absence of other CD1s.

Conclusions:

  • CD1c exhibits a unique, comprehensive sampling of the endocytic system for lipid antigens.
  • CD1c's functional independence from acidity broadens its role in lipid antigen surveillance.
  • CD1c plays a vital role in detecting diverse lipid antigens, particularly when other CD1 molecules are absent.