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  • Title: Interleukin-5 messenger RNA and immunoreactive protein expression by activated eosinophils in lesional atopic dermatitis skin.
    Author: Tanaka Y, Delaporte E, Dubucquoi S, Gounni AS, Porchet E, Capron A, Capron M.
    Journal: J Invest Dermatol; 1994 Oct; 103(4):589-92. PubMed ID: 7523534.
    Abstract:
    The main cellular sources of interleukin-5 (IL-5) are T lymphocytes and mast cells. Recently, IL-5 mRNA has been identified in eosinophils from patients with celiac disease, eosinophilic heart diseases, and asthma. In an attempt to determine whether IL-5 is generated by eosinophils in atopic dermatitis we have used i) in situ hybridization with 35S-labeled IL-5 RNA probe combined with immunohistochemistry using a monoclonal antibody (MoAb) (EG2) directed against the activated form of Eosinophil Cationic Protein (ECP) and ii) double-immunostaining with anti-IL-5 MoAb and polyclonal anti-ECP antibody. We found that dermal eosinophils from lesional atopic dermatitis skin express IL-5 mRNA and protein. Moreover, highly purified blood eosinophils were also labeled with anti-IL-5 antibodies. The expression of IL-5 by eosinophils in atopic dermatitis might suggest an autocrine pathway of eosinophil differentiation and activation.
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