In:
The Journal of Immunology, The American Association of Immunologists, Vol. 170, No. 10 ( 2003-05-15), p. 5295-5301
Abstract:
The migration of dendritic cells (DCs) from the epithelia to the lymphoid organs represents a tightly regulated multistep event involved in the induction of the immune response. In this process fatty acid derivatives positively and negatively regulate DC emigration. In the present study we investigated whether activation of peroxisome proliferator-activated receptors (PPARs), a family of nuclear receptors activated by naturally occurring derivatives of arachidonic acid, could control DC migration from the peripheral sites of Ag capture to the draining lymph nodes (DLNs). First, we show that murine epidermal Langerhans cells (LCs) express PPARγ, but not PPARα, mRNA, and protein. Using an experimental murine model of LC migration induced by TNF-α, we show that the highly potent PPARγ agonist rosiglitazone specifically impairs the departure of LCs from the epidermis. In a model of contact allergen-induced LC migration, PPARγ activation not only impedes LC emigration, and their subsequent accumulation as DCs in the DLNs, but also dramatically prevents the contact hypersensitivity responses after challenge. Finally, after intratracheal sensitization with an FITC-conjugated Ag, PPARγ activation inhibits the migration of DCs from the airway mucosa to the thoracic LNs and also profoundly reduces the priming of Ag-specific T lymphocytes in the DLNs. Our results suggest a novel regulatory pathway via PPARγ for DC migration from epithelia that could contribute to the initiation of immune responses.
Type of Medium:
Online Resource
ISSN:
0022-1767
,
1550-6606
DOI:
10.4049/jimmunol.170.10.5295
Language:
English
Publisher:
The American Association of Immunologists
Publication Date:
2003
detail.hit.zdb_id:
1475085-5
