Association Between CD200 Molecule Expression on B Lymphocytes and Levels of Specific IgE Against Molecular Components of Storage Mites, Animals and Molds in Atopic Dermatitis Patients

This study investigated the relationship between CD200 molecule expression on B- lymphocytes and the levels of specific IgE to molecular components of storage mites (Gly d 2, Lep d 2), dog (Can f 1, Can f 2), cat (Fel d 1), shrimp (Pen m 2), molds (Asp f 6, Mala s 11, Alt a 6, Alt a 1, Mala s 6, Cla h), and German cockroach (Bla g 9) in patients with atopic dermatitis (AD), both with and without dupilumab therapy. The study included 46 patients with AD- 26 without dupilumab treatment and 20 with dupilumab treatment. Serum levels of specific IgE were measured using the ALEX2 Allergy Xplorer diagnostic microarray and CD200 molecule was evaluated with the use of flow cytometry. Spearman's rank correlation coefficient was used to assess the relationship between B-lymphocyte CD200 expression and specific IgE levels to molecular components. According to the results, the association between CD200 expression and specific IgE levels to molecular components was low (up to 10%) in AD  patients without dupilumab therapy. In patients with dupilumab therapy, the association was non-linear, indicating that the two monitored parameters had opposite effects. In conclusion, the present study did not confirm any association between the CD200 molecule on B-lymphocytes and specific IgE levels to molecular components.