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Oral administration of poly-γ-glutamic acid prevents the development of atopic dermatitis in NC/Nga mice

1. Sung Won Lee^1,2,†, 
2. Hyun Jung Park^1,†,
3. Se-Ho Park^2,*, 
4. Seokmann Hong^1,*

Article first published online: 23 JUL 2013

DOI: 10.1111/exd.12198

© 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd

Issue

Experimental Dermatology

Volume 22, Issue 8, pages 561–563, August 2013

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Keywords:

• atopic dermatitis;
• cytokine;
• mast cell;
• poly-γ-glutamic acid;
• T helper differentiation

Abstract

Bacillus subtilis-derived poly-γ-glutamic acid (γPGA) has demonstrated adjuvant activity in promoting Th1/Th17 cell differentiation. Here, the NC/Nga (NC) mouse model was used to determine whether γPGA modulates the outcome of atopic dermatitis (AD), which is known to be a Th2-biased immune disease. We found that oral administration of γPGA dramatically reduced the development of AD in NC mice. Antigen-presenting cells activated with γPGA produced pro-inflammatory cytokines, such as IL12/23 and IFNγ, which, in turn, induced the differentiation of Th1 and Th17 cells. Concomitantly, Th2 responses, such as high levels of serum IgE, were dramatically decreased. Furthermore, in vivo γPGA treatment altered several cellular components of allergic reactions, such as mast cells and eosinophils. Taken together, our results strongly demonstrate that in vivo treatment with γPGA at early time points can prevent the development of AD in NC mice and suggest that γPGA may have therapeutic applications for human AD.

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