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Topically applied nitric oxide induces T-Lymphocyte infiltration in human skin, but minimal inflammation

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Author(s)

Megan Mowbray, Xuejing Tan, Paul S. Wheatley, Russell E. Morris, Richard B. Weller

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Abstract

Nitric oxide (NO) plays an important role in the cutaneous response to UV radiation and in cutaneous inflammation. The presence of inducible NO synthase protein in a number of inflammatory dermatoses, coupled with the induction of an intense cutaneous inflammatory infiltrate following topical application of the NO donor-acidified nitrite (NO2-), has set the paradigm of NO being an inflammatory mediator in human skin. Using zeolite NO (Ze-NO), a chemically inert, pure NO donor, we have shown that NO per se produces little inflammation. Biologically, relevant doses of Ze-NO induce a dermal CD4-positive T-cell infiltrate and IFN-gamma secretion. In contrast acidified nitrite, releasing equal quantities of NO (measured by dermal microdialysis and cutaneous erythema), induces an intense epidermal infiltrate of macrophages with a similar dermal infiltrate of CD3-, CD4-, CD8-, and CD68-positive cells and neutrophils. Suction blisters were created in Ze-NO-treated and control skin. IFN-gamma, but not IL-4, was detected in Ze-NO-treated skin (mean control 0.1 +/- 0.07 pg mg(-1) protein, mean IFN-g 0.670.4 pgmg(-1) protein). We suggest that the potent inflammation induced by acidified NO2- is secondary to the release of additional mediators.

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Original languageEnglish
Pages (from-to)352-360
Number of pages9
JournalJournal of Investigative Dermatology
Volume128
Issue number2
DOIs
Publication statusPublished - Feb 2008

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