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Enhanced expression of the high-affinity receptor for IgE (Fc(epsilon)RI) associated with decreased numbers of Langerhans cells in the lesional epidermis of atopic dermatitis.
Journal of Dermatological Science 2001 November
Epidermal Langerhans cells (LCs) and the high-affinity receptor for IgE (Fc(epsilon)RI) on their surface are considered important in the pathogenesis of atopic dermatitis (AD). We investigated the numbers of epidermal LCs and their Fc(epsilon)RI expression in patients with AD and healthy controls. Biopsy specimens taken from lesional skin from 17 patients with AD, non-lesional skin from five patients with AD and normal skin from five healthy individuals were immunohistochemically stained with a monoclonal antibody against CD1a or with either of two monoclonal antibodies against two different epitopes of Fc(epsilon)RI alpha chain. Many dendritic cells were positively stained with anti-CD1a antibody in the epidermis of each skin sample, and fewer cells were stained with anti-Fc(epsilon)RI antibodies. The numbers of epidermal LCs positive for Fc(epsilon)RI were significantly increased in both lesional and non-lesional skin from AD patients compared with those in normal skin, suggesting important roles of Fc(epsilon)RI+LCs in the pathogenesis of the disease. In contrast, the numbers of total epidermal LCs (CD1a-positive) were decreased in AD lesional skin compared with those in non-lesional skin from AD patients and in normal skin from healthy subjects. Together with our finding that the numbers of epidermal LCs were negatively correlated with the clinical severity of the AD lesions, we concluded that epidermal LCs may decrease in some conditions of AD, probably in lesions with severe inflammation.
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