Tacrolimus ointment causes inflammatory dendritic epidermal cell depletion but no Langerhans cell apoptosis in patients with atopic dermatitis

The Journal of Allergy and Clinical Immunology
Erika SchullerA Wollenberg

Abstract

The topical immunomodulators tacrolimus and pimecrolimus are novel therapeutic options for atopic dermatitis (AD). The inhibition of nuclear factor of activated T cell-dependent proinflammatory cytokine production in cutaneous lymphocytes is an established effect of topical immunomodulators, which additionally influence mast cells, eosinophils, and dendritic cells (DCs). The latter include a reduced expression of the high-affinity IgE receptor FcepsilonRI, a reduced stimulatory capacity of lesional DCs, and a selective depletion of the inflammatory dendritic epidermal cells (IDECs) but not of Langerhans cells (LCs) from the lesional skin. Because induction of apoptosis in lymphocytes is a reported tacrolimus effect, we asked whether tacrolimus ointment induces apoptosis of LCs or IDECs in AD lesions. Epidermal single-cell suspensions were prepared from AD lesions of 9 tacrolimus-treated and 5 hydrocortisone butyrate-treated patients with AD before and after 1 week of treatment. Cell numbers, apoptosis rate, and immunophenotype were assessed by using the standardized FACS technique with terminal deoxynucleotidyltransferase-mediated dUTP nick end labeling, Annexin V, and 3-color immunophenotyping. Freshly isolated LCs and monocyt...Continue Reading

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