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Circulating cell‐free DNA levels in P ortuguese patients with psoriasis vulgaris according to severity and therapy
Author(s) -
Coimbra S.,
Catarino C.,
Costa E.,
Oliveira H.,
Figueiredo A.,
RochaPereira P.,
SantosSilva A.
Publication year - 2014
Publication title -
british journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.304
H-Index - 179
eISSN - 1365-2133
pISSN - 0007-0963
DOI - 10.1111/bjd.12738
Subject(s) - psoriasis , medicine , portuguese , dermatology , philosophy , linguistics
Summary Background Inflammation has a key role in the pathogenesis of psoriasis. Circulating cell‐free DNA ( CFD ) is a marker of tissue cell damage closely associated with inflammation. Objectives We aimed to understand the relation of CFD levels with psoriasis severity, defined by the P soriasis A rea and S everity Index ( PASI ), with inflammation and with psoriasis therapy. Methods Forty‐six patients with psoriasis vulgaris were evaluated before (T0) and after 12 weeks (T12) of treatment with narrowband ultraviolet light B ( NB ‐ UVB ; n = 17), psoralen plus UVA ( PUVA ; n = 20) or topical therapy ( n = 9). We evaluated interleukin ( IL )‐6 and circulating CFD levels. Results Compared with controls, at T0, patients presented significantly higher levels of circulating CFD . CFD presented a significant positive correlation with IL ‐6 and a trend towards a positive correlation with PASI . Multiple linear regression analysis identified IL ‐6 as an independent variable associated with CFD circulating levels. As shown by the PASI score, a trend towards higher values of CFD was observed in the severe psoriasis forms; moderate and severe psoriasis presented also significantly higher CFD values, compared with control. Both NB ‐ UVB and PUVA treatments significantly decreased the levels of CFD . Conclusions Patients with psoriasis, at the active stage of the disease, presented an increased inflammation associated with raised circulating CFD levels, which seem to be linked to psoriasis severity. Both NB ‐ UVB and PUVA , anti‐inflammatory therapies, were effective in decreasing CFD values. We propose that the evaluation of circulating CFD may provide a new biomarker to monitor psoriasis, its severity and its treatment.