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Background  Topical administration of PR022, 0.05% hypochlorous acid (HOCl) in gel has been demonstrated to be beneficial in a chronic murine atopic dermatitis model. In a follow up study we tested a higher concentration (0.1%) of PR022 HOCl gel in comparison to the Janus kinase inhibitor tofacitinib, both of which are currently in clinical phase studies for treatment of human atopic dermatitis.    Methods  The effect of topically administered HOCl (0.1%) in gel was compared to a topical formulation of tofacitinib (0.5%) in a therapeutic setting on atopic dermatitis-like lesions in NC/Nga mice as well as itch behaviour. NC/Nga mice were sensitized with house dust mite allergen. After reaching visible lesions, mice were treated either topically with HOCl or tofacitinib or gel vehicle for 17 days. After termination of the study, dorsal root ganglia were isolated for ex vivo stimulation and skin samples were taken for cytokine determination in inflamed skin.    Results  When administered onto lesional skin of NC/Nga mice, both HOCl and tofacitinib reduced lesions and scratching behaviour. The reduced inflammatory response by HOCl and tofacitinib treatment was demonstrated by diminished inflammatory cytokines in affected skin tissue from NC/Nga mice. Dorsal root ganglia neurons re-stimulated with a range of mediators of itch showed a reduced response compared to the vehicle control mice, when isolated from tofacitinib or HOCl treated mice.    Conclusions  These data indicate a similar beneficial potential of topical high dose PR022 HOCl (0.1%) in gel and tofacitinib, in a translational murine model of atopic dermatitis.

Comparison of topical tofacitinib and 0.1% hypochlorous acid in a murine atopic dermatitis model