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ENGLISH ABSTRACT
JOURNAL ARTICLE
[Psoriasis vs. psoriatic arthritis : Similarities and differences in the pathophysiology].
Zeitschrift Für Rheumatologie 2017 August
Psoriasis is a chronic inflammatory skin disease with genetic and (auto)immunological backgrounds. Up to 30% of patients with psoriasis also develop a mostly oligoarticular arthritis with spinal involvement that is termed psoriatic arthritis (PsA) and shows a specific joint pattern which differs from that of rheumatoid arthritis (RA). Both Psa and psoriasis share a common main axis, the interleukin (IL) 23/IL17 pathway as well as major overlaps in the functions of tumor necrosis factor alpha (TNFalpha). Recently acquired knowledge supports the concept that in both diseases, similar genetic dispositions and molecular pathways lead to organ-specific disease patterns. In some types of PsA, genetic predisposition and the relevance of acute inflammatory reactions appear to be greater that in psoriasis, while in the latter exogenous factors and T‑lymphocyte reactions in the skin seem to have a higher impact. A key difference between PsA and cutaneous psoriasis is the largely irreversible nature of inflammatory joint changes in PsA, whereas cutaneous plaques in psoriasis completely heal. The question of how interdependent both diseases are and whether immunologically primed T‑lymphocytes from cutaneous lesions in PsA may transmit the disease to the synovial membranes and induce acute inflammation is not precisely known. A detailed analysis of these organ-specific differences may not only provide an explanation for the similar, but partly different efficacy of novel therapeutic strategies but may also lead to the development of personalized therapies that take into account the individually different manifestations of the diseases over time.
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