title: Chemokine-like factor 1 (CLFK1) is over-expressed in patients with atopic dermatitis.
abstract: 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.
authors: Department of Dermatology, Beijing Friendship Hospital, Capital Medical University, Beijing 100050, China. gaoyun@ccmu.edu.cn
authors: Gao-Yun
authors: GY
authors: Yang
authors: Xue
authors: X
authors: Chen
authors: Ya-Chun
authors: YC
authors: Sun
authors: Chen-Li
authors: CL
authors: Ma
authors: Ge
authors: G
authors: Qian
mesh_terms: D018925:Chemokines / Q000097:blood / Q000378:metabolism*; D017931:DNA Primers / Q000235:genetics; D003876:Dermatitis, Atopic / Q000097:blood / Q000276:immunology* / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D005786:Gene Expression Regulation / Q000276:immunology*; D006801:Humans; D007150:Immunohistochemistry; D062792:MARVEL Domain-Containing Proteins / Q000097:blood / Q000378:metabolism*; D060888:Real-Time Polymerase Chain Reaction; D012867:Skin / Q000378:metabolism; D018418:Th2 Cells / Q000378:metabolism
chemical_list: C432676:CKLF protein, human; D018925:Chemokines; D017931:DNA Primers; D062792:MARVEL Domain-Containing Proteins
keywords: atopic dermatitis (AD); chemokine-like factor 1 (CKLF1).
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