Abstract

Since their discovery in 1868, the role of Langerhans cells (LCs) in skin immunity has been researched extensively. Recent data deriving from transgenic animals that are deficient in LCs have begun to challenge the dogma that there is a universal requirement for these cells in the development of skin sensitization. This Commentary addresses relationships between LC mobilization, draining lymph node activation, and skin sensitization using immunomodulators agonistic for a family of sphingosine-1-phosphate (S1P) receptors.

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