Display Settings:

Format

Send to:

Choose Destination
See comment in PubMed Commons below
Immunity. 2007 Jan;26(1):117-29.

Ito cells are liver-resident antigen-presenting cells for activating T cell responses.

Author information

  • 1Department of Immunology, Max-Planck-Institute for Infection Biology, Schumannstrasse 21-22, 10117 Berlin, Germany. winau@mpiib-berlin.mpg.de

Abstract

Here we identified Ito cells (hepatic stellate cells, HSC), known for storage of vitamin A and participation in hepatic fibrosis, as professional liver-resident antigen-presenting cells (APC). Ito cells efficiently presented antigens to CD1-, major histocompatibility complex (MHC)-I-, and MHC-II-restricted T cells. Ito cells presented lipid antigens to CD1-restricted T lymphocytes such as natural killer T (NKT) cells and promoted homeostatic proliferation of liver NKT cells through interleukin-15. Moreover, Ito cells presented antigenic peptides to CD8(+) and CD4(+) T cells and mediated crosspriming of CD8(+) T cells. Peptide-specific T cells were activated by transgenic Ito cells presenting endogenous neoantigen. Upon bacterial infection, Ito cells elicited antigen-specific T cells and mediated protection. In contrast to other liver cell types that have been implicated in induction of immunological tolerance, our data identify Ito cells as professional intrahepatic APCs activating T cells and eliciting a multitude of T cell responses specific for protein and lipid antigens.

Comment in

PMID:
17239632
[PubMed - indexed for MEDLINE]
Free full text
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for Elsevier Science
    Loading ...
    Write to the Help Desk