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An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets
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Regulation of dendritic cell migration by CD74, the MHC class II-associated invariant chain

Gabrielle Faure-André1, Pablo Vargas, Maria-Isabel Yuseff

  • 1INSERM U653, Institut Curie, 12 rue Lhomond, 75005, Paris, France.

Science (New York, N.Y.)
|December 17, 2008
PubMed

Insights

The invariant chain (Ii or CD74) regulates dendritic cell (DC) movement. Ii deficiency enhances DC motility, suggesting a link between antigen processing and immune cell migration in tissues.

Area of Science:

  • Immunology
  • Cell Biology
  • Biophysics

Background:

  • Dendritic cells (DCs) are crucial for initiating adaptive immune responses by sampling antigens in peripheral tissues.
  • Antigen processing and DC motility were traditionally considered independent processes.
  • The invariant chain (Ii or CD74) is known to regulate antigen processing for presentation by MHC class II molecules.

Purpose of the Study:

  • To investigate the role of the invariant chain (Ii or CD74) in regulating dendritic cell (DC) motility.
  • To determine if antigen processing and DC motility are linked.
  • To understand the molecular mechanisms by which Ii influences DC migration.

Main Methods:

  • Utilized microfabricated channels to simulate the confined microenvironment of peripheral tissues.
  • Compared the motility of wild-type DCs with Ii-deficient DCs in these channels.
  • Investigated the involvement of myosin II in Ii-mediated regulation of DC motility.

Main Results:

  • Wild-type DCs exhibited alternating periods of high and low motility in confined environments.
  • Ii-deficient DCs displayed faster and more uniform movement compared to wild-type cells.
  • The regulatory effect of Ii on DC motility was dependent on the actin-based motor protein myosin II.

Conclusions:

  • The invariant chain (Ii or CD74) negatively regulates dendritic cell motility in vivo.
  • Antigen processing and cell motility are coupled processes in DCs, mediated by Ii and myosin II.
  • This coupling may enhance the efficiency of antigen detection and processing by DCs within tissue spaces.

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