Background: Concomitant atopic dermatitis (AD) and psoriasis (PS) are not common. However, both diseases are still of interest because of their comprehensive and diverse mechanism. The aim of the study was to present the clinical and immunological profile of patients with concomitant AD and PS coexist in comparison to patients with one of these diseases.
Methods: In this observational study, 38 children with concomitant AD and PS with a mean age of 6.5 ± 3.2 yrs. were compared with similar 41 patients with only AD (5.3± 5.1 yrs) and with 28 with PS (6.4± 4.3 yrs). All patients underwent the dermatological examination including SCORAD and PASI questionnaire. TNF-α, IFN-γ, Il-2, Il-4, Il-5, Il-6, Il-8, Il-12, I-17, Il-18, Il-22, Il-33, TARC/CCL17 were measured by the use ELISA method and according manufacturer (ThermoFischer Scientific, US).
Results: Patients with concomitant AD and PS were frequently boys or with overweight and with a proportional area distribution of skin lesions. A positive family history of atopic disease was more frequently reported by children with concomitant AD and PS, and with AD vs. PS. Significant differences were observed in the concentration of Il-17 in patients with AD and PS compared with that in AD or PS patients as follows: 9.1±3.7 pg/ml vs. 4.8±2.9 pg/ml and 5.2±3.9 pg/ml (PD vs. AD, p = 0.01; PD vs. PS, p = 0.03).
Conclusion: AD and PS might coexist as overlapping disease. The role of T-helper 17 may be more meaningful than it appeared.