• Arum Park, Eun Lee, Hyojung Park, Mee-Na Park, Jiho Lee, Kun Baek Song, Jisun Yoon, Sungsu Jung, Nayoung Suh, Jin Yoon, and Jinho Yu.
• Asan Institute for Life Sciences, Asan Medical Center, Seoul, Korea.
• J. Korean Med. Sci. 2021 Oct 18; 36 (40): e261.

BackgroundAtopic dermatitis (AD) is a chronic and relapsing inflammatory skin disease mediated by T helper type 2 (Th2) cells in acute phase. Group 2 innate lymphoid cells (ILCs) play a role in the initiation of the Th2 response. Although mold exposure is associated with the development of AD, studies on the underlying mechanisms are lacking. This study investigated whether group 2 ILCs are involved in inflammation in AD-like skin induced by Aspergillus fumigatus (Af).MethodsWe investigated changes of group 2 ILCs population in Af-induced AD-like skin lesions. To induce AD-like skin lesions, Af extracts were applied to the dorsal skin of BALB/c and Rag1-/- mice five times per week, with repeat exposures at 2-week intervals.ResultsThe clinical parameters were higher in the Af-treated group than in the control group. Histologic findings revealed epiderrmal and dermal thickening as well as eosinophil and mast cell infiltration into the skin of Af-treated mice. Populations of group 2 ILCs in the skin were also significantly higher in the Af-treated group. In addition, interleukin-33 mRNA expression was significantly higher in the skin lesions of the Af-treated mice. In the Rag1-/- mice lacking mature lymphocytes, AD-like skin lesions were still induced by Af and ILCs depletion using an anti-CD90.2 mAb lowered the Af-induced inflammatory response.ConclusionsGroup 2 ILCs may play a role in a murine model of Af-induced AD-like skin lesions.© 2021 The Korean Academy of Medical Sciences.

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