, Volume 41, Issue 2, pp 378–389 | Cite as

JNJ7777120 Ameliorates Inflammatory and Oxidative Manifestations in a Murine Model of Contact Hypersensitivity via Modulation of TLR and Nrf2 Signaling

  • Ahmed F. Mohamed
  • Mohammed F. El-Yamany
  • Fatma A. El-Batrawy
  • Mohamed T. Abdel-Aziz


JNJ7777120, a histamine H4 receptor antagonist, was shown to be effective in different experimental settings of allergic inflammation, including contact hypersensitivity. Toll-like receptors (TLRs) are thought to function as a link between innate and adaptive immune responses to various haptens. Here, we studied the suppression of TLR signaling as a possible mechanism by which JNJ7777120 exerts its anti-inflammatory effects against the chemical hapten, fluorescein isothiocyanate (FITC). The potential anti-oxidant effect of JNJ7777120 in this model was also examined. Mice subjected to FITC sensitization and challenge showed significantly elevated plasma immunoglobulin E (IgE) level, ear interleukin-4 (IL-4), tumor necrosis factor-alpha (TNF-α), and thiobarbituric acid reactive substance (TBARS) contents as well as increased myeloid differentiation factor 88 (MyD88) gene expression, nuclear factor-kappa B p65 (NF-κB p65), and phospho-p38 mitogen-activated protein kinase (p-p38 MAPK) protein expression. This was accompanied by enhanced ear myeloperoxidase (MPO) and eosinophil peroxidase (EPO) activities as well as diminished glutathione (GSH) content and superoxide dismutase (SOD) activity. JNJ7777120 treatment perceivably reversed these effects, denoting profound anti-inflammatory and anti-oxidant character of JNJ7777120 which was confirmed by its mitigation of FITC-induced pathological changes in mouse ear. JNJ7777120 additionally enhanced the expression of nuclear factor erythroid 2-related factor 2 (Nrf2), providing a novel mechanism by which JNJ7777120 functions as an anti-oxidant in this model. To conclude, JNJ7777120 afforded a remarkable amendment of FITC skin insult by virtue of its anti-inflammatory and anti-oxidant effects; the mechanistic basis of these effects may include modulation of TLR and Nrf2 pathways.


FITC H4 receptor allergic inflammation MyD88 NF-κB 


Compliance with Ethical Standards

All animal experiments were performed in accordance with the Guide for the Care and Use of Laboratory Animals published by the US National Institutes of Health (NIH Publication No. 85-23, revised 1996) and were approved by the Ethics Committee for Animal Experimentation at Faculty of Pharmacy, Cairo University (PT 808).

Conflict of Interest

The authors declare that they have no conflicts of interest.


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Authors and Affiliations

  1. 1.Department of Pharmacology and Toxicology, Faculty of PharmacyCairo UniversityCairoEgypt
  2. 2.Department of Pharmacology, Faculty of MedicineCairo UniversityCairoEgypt

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