Psoriasis is one of the most common chronic inflammatory skin diseases and is characterised by the uncontrolled proliferation of keratinocytes and their abnormal differentiation. Sirtuins are a group of enzymes that play an important role in post-translational modifications of proteins, such as deacetylation, poly-ADP-ribosylation, demalonylation and lipoamidation. They are found in various cell types and are involved in ribosomal DNA recombination, gene silencing and DNA repair. This study aimed to examine the plasma levels of sirtuin 3, 4 and 5 in patients with psoriasis and correlate these levels with clinical parameters. The study included 43 patients with plaque-type psoriasis and 28 healthy controls. The plasma concentrations of sirtuin 3 were statistically significantly increased in patients with psoriasis compared to the control subjects. The plasma concentrations of sirtuin 4 and 5 were statistically significantly lower in patients with psoriasis than in the control group. No statistically significant correlations were found between the plasma levels of sirtuin 3 and 4 and the psoriasis activity tools of PASI, DLQI and the BSA index or the selected clinical parameters in patients with psoriasis. Plasma concentrations of sirtuin 5 correlated statistically significantly with the BSA index, haemoglobin and leukocytes. The results of this study suggest the involvement of sirtuin 3, 4 and 5 in the pathogenesis of psoriasis. However, an explanation of the role of sirtuins in psoriasis requires further research.
