Abstract
Excessive Th2 cell signaling and IgE production play key roles in the pathogenesis of atopic dermatitis (AD). Yet, recent information suggests that the inflammation in AD instead is initiated by inherited insults to the barrier, including a strong association between mutations in FILAGGRIN and SPINK5 in Netherton syndrome, the latter of which provides an important clue that AD is provoked by excess serine protease activity. But acquired stressors to the barrier may also be required to initiate inflammation in AD, and in addition, microbial colonization by Staphylococcus aureus both amplifies inflammation, but also further stresses the barrier in AD. Therapeutic implications of these insights are as follows: While current therapy has been largely directed toward ameliorating Th2-mediated inflammation and/or pruritus, these therapies are fraught with short-term and potential long-term risks. In contrast, “barrier repair” therapy, with a ceramide-dominant triple-lipid mixture of stratum corneum lipids, is more logical, of proven efficacy, and it provides a far-improved safety profile.
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Notes
Reductions in inflammation alone can, however, reduce TEWL due to the “vicious cycle” that is operative in AD (Elias et al. [70]).
Data on file with Promius Pharma, Bridgewater, NJ, USA.
Abbreviations
- AD:
-
Atopic dermatitis
- AMP:
-
Antimicrobial peptides
- Cer:
-
Ceramides
- FLG:
-
Filaggrin
- FFA:
-
Free fatty acids
- hBD:
-
Human β-defensins
- hCAP:
-
Human cathelicidin
- IV:
-
Ichthyosis vulgaris
- LB:
-
Lamellar bodies
- LEKTI:
-
Lymphoepithelial Kazal-type inhibitor
- NS:
-
Netherton syndrome
- PAR2:
-
Plasminogen activator type 2 receptor
- SP:
-
Serine protease
- SC:
-
Stratum corneum
- t-UCA:
-
Trans-urocanic acid
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Acknowledgments
This work was supported by NIH grants R01-AR019098 and R01-AI059311, DOD grant W81XWH-05-2-0094, and the Medical Research Service, Department of Veterans Affairs. Dr. Matthias Schmuth, Chairman, Department of Dermatology, Innsbruck Medical University, Innsbruck, Austria provided multiple insights that substantially improved the content of this manuscript.
Conflict of Interest Statement
Dr. Elias is a co-inventor of the optimal ratio, triple-lipid therapy for atopic dermatitis. He also is a consultant for Promius Pharma, LLC and Pediapharm, Inc., which market EpiCeram® in the USA and Canada, respectively.
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Elias, P.M., Wakefield, J.S. Therapeutic Implications of a Barrier-Based Pathogenesis of Atopic Dermatitis. Clinic Rev Allerg Immunol 41, 282–295 (2011). https://doi.org/10.1007/s12016-010-8231-1
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DOI: https://doi.org/10.1007/s12016-010-8231-1