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Int J Biol Sci 2013; 9(8):759-765. doi:10.7150/ijbs.6291

Short Research Communication

Chemokine-Like Factor 1 (CLFK1) Is Over-Expressed in Patients with Atopic Dermatitis

Gao-yun Yang1✉, Xue Chen1, Ya-chun Sun1, Chen-li Ma1, Ge Qian2✉

1. Department of Dermatology, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China;
2. Department of Dermatology and Rheumatology, the 2nd Affiliated Hospital of Kunming Medical University, Kunming 650101, China.


Background: Human chemokine-like factor 1 (CKLF1), a recently discovered chemokine, has a broad spectrum of biological functions in immune-mediated diseases. It is highly expressed on Th2 lymphocytes and is a functional ligand for human CCR4. CKLF1 has a major role in the recruitment and activation of leucocytes, which plays an important role in the pathogenesis of allergic diseases. The present study was designed to determine the expression of CKLF1 in skin and serum in patients with atopic dermatitis (AD).

Methods: The CKLF1 protein expression in skin lesion was analyzed by immunohistochemistry and ELISA. The mRNA expression of CKLF1 in skin lesion was detected by Real-time PCR. The serum levels of CKLF1, IgE, eotaxin, IL-4, IL-5, and IL-13 were measured by ELISA.

Results: Histopathological changes in the skin of AD patients showed local inflammation with epidermal thickening and significant inflammatory cellular infiltration. Immunohistochemistry results demonstrated that CKLF1-staining positive cells were located in the epidermal and dermis, and that the CKLF1 expression in AD patients was significantly higher than that in normal control. The CKLF1 mRNA expression in AD patients was significantly higher than that in healthy controls. Serum CKLF1 and IgE levels were significantly increased in AD patients, as were the serum levels of IL-4, IL-5, IL-13 and eotaxin.

Conclusions: Both CKLF1 protien and mRNA levels are overexpressed in the skin lesion of AD patients, along with an increase in serum CKLF1 level, indicating that CKLF1 may play an important role in the development of atopic dermatitis.

Keywords: atopic dermatitis (AD), chemokine-like factor 1 (CKLF1).

This is an open access article distributed under the terms of the Creative Commons Attribution (CC BY-NC) License. See for full terms and conditions.
How to cite this article:
Yang Gy, Chen X, Sun Yc, Ma Cl, Qian G. Chemokine-Like Factor 1 (CLFK1) Is Over-Expressed in Patients with Atopic Dermatitis. Int J Biol Sci 2013; 9(8):759-765. doi:10.7150/ijbs.6291. Available from