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Systemic migration of dendritic cells during contact sensitization
S Hill1, A J Edwards, I Kimber
1Division of Immunological Medicine, Clinical Research Centre, Harrow, Middlesex, U.K.
Immunology
|October 1, 1990
Summary
Skin exposure to fluorescein isothiocyanate (FITC) triggers a systemic dendritic cell (DC) migration to lymph nodes. While DCs in draining lymph nodes carry antigen, those in distant nodes do not, suggesting a non-antigen-specific signal.
Area of Science:
- Immunology
- Dendritic Cell Biology
- Contact Hypersensitivity
Background:
- Dendritic cells (DCs) are key antigen-presenting cells crucial for initiating adaptive immune responses.
- Contact sensitizers, like fluorescein isothiocyanate (FITC), induce immune responses involving DC migration.
- The distribution and antigen-carrying capacity of DCs in various lymph nodes following topical sensitization are not fully understood.
Purpose of the Study:
- To investigate the migration patterns of dendritic cells (DCs) after topical application of a contact sensitizer.
- To determine the antigen load on DCs in draining, contralateral, and distant lymph nodes.
- To explore the role of T cells in FITC-induced DC migration.
Main Methods:
- Mice were painted on the flank with fluorescein isothiocyanate (FITC).
- Dendritic cells (DCs) were isolated from draining, contralateral, and distant lymph nodes 24 hours post-painting.
- Antigen detection on DCs and their ability to stimulate naive T cells in vitro were assessed.
- Experiments were also conducted in nude mice to assess the role of mature T cells.
Main Results:
- A sharp increase in dendritic cell (DC) numbers was observed in draining, contralateral, and distant lymph nodes.
- High antigen levels were found on DCs from draining lymph nodes, which potently stimulated T cells.
- DCs from contralateral and distant lymph nodes showed minimal antigen and weak T-cell stimulation.
- A significant number of DCs migrated to all lymph node groups without detectable antigen.
- Systemic DC migration occurred independently of mature T cells, as observed in nude mice.
Conclusions:
- Topical fluorescein isothiocyanate (FITC) induces a systemic migration of dendritic cells (DCs) to multiple lymph nodes.
- Antigen acquisition by DCs appears localized to draining lymph nodes, while migration is a systemic phenomenon.
- The systemic migration of DCs is independent of mature T cells, suggesting a non-antigen-specific signaling pathway.