Abstract：
:Until recently, IgE-activated mast cells have been regarded merely as effector cells of adaptive immune responses, involved in allergic reactions and mucosal immunity to parasites. Herein, we report that murine dermal mast cells, activated by local administration of a cream containing the synthetic TLR7 ligand imiquimod, are essential to initiate an early inflammatory reaction. The mast-cell-derived cytokines TNF-alpha and IL-1beta play an important role in this process. Furthermore, TLR7-activated mast cells are also able to promote the emigration of Langerhans cells, which partly depends on the expression of mast-cell-derived IL-1beta. We have previously shown that TLR7 ligation enhances transcutaneous immunization evoked by topical application of vaccine antigens to the skin, a procedure that directly targets skin-resident antigen-presenting cells. Consequently, we now demonstrate here that the capacity to mount a peptide-specific cytotoxic T-lymphocyte response following transcutaneous immunization using imiquimod as adjuvant is severely impaired in mast-cell-deficient mice. Thus, these findings demonstrate the potent versatility of alternatively activated mast cells at the interface of innate and adaptive immunity.
journal_name
Bloodjournal_title
Bloodauthors
Heib V,Becker M,Warger T,Rechtsteiner G,Tertilt C,Klein M,Bopp T,Taube C,Schild H,Schmitt E,Stassen Mdoi
10.1182/blood-2006-07-036889subject
Has Abstractpub_date
2007-08-01 00:00:00pages
946-53issue
3eissn
0006-4971issn
1528-0020pii
blood-2006-07-036889journal_volume
110pub_type
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