Expression of fractalkine and its receptor, CX3CR1, in atopic dermatitis: possible contribution to skin inflammation - PubMed (original) (raw)
Expression of fractalkine and its receptor, CX3CR1, in atopic dermatitis: possible contribution to skin inflammation
Takeshi Echigo et al. J Allergy Clin Immunol. 2004 May.
Free article
Abstract
Background: Fractalkine (FKN) induces activation and adhesion of leukocytes expressing its receptor, CX(3)CR1. FKN is released from the cell surface through proteolytic cleavage as soluble FKN (sFKN).
Objective: We sought to assess FKN and CX(3)CR1 expression in the skin, serum sFKN levels, and CX(3)CR1 expression on blood leukocytes in patients with atopic dermatitis (AD).
Methods: FKN and CX(3)CR1 expression in the skin was examined immunohistochemically. mRNA expression of FKN, thymus and activation-regulated chemokine, and macrophage-derived chemokine in the skin was assessed by means of real-time RT-PCR. Serum sFKN levels were assessed by using ELISA. Blood leukocytes were stained for CX(3)CR1 by means of flow cytometric analysis.
Results: FKN was strongly expressed on endothelial cells in skin lesions of patients with AD and psoriasis but not in normal skin. FKN mRNA levels in AD lesional skin increased to a similar extent to thymus and activation-regulated chemokine and macrophage-derived chemokine mRNA levels. CX(3)CR1-expressing cells in the affected skin of patients with AD or psoriasis increased compared with those in normal skin. Serum sFKN levels were increased in patients with AD but not in patients with psoriasis relative to levels in healthy control subjects. Serum sFKN levels were associated with the disease severity and decreased with the improvement of skin lesions in patients with AD. CX(3)CR1(+) cell frequencies and CX(3)CR1 expression levels were decreased in CD8(+) T cells, monocytes, and natural killer cells from patients with AD, but this was not observed in patients with psoriasis.
Conclusions: These results suggest that through functions in both membrane-bound and soluble forms, FKN plays an important role in the trafficking of CX(3)CR1(+) leukocytes during the inflammation caused by AD.
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