Omentin-1 plasma levels and omentin-1 expression are decreased in psoriatic lesions of psoriasis patients.

Previous studies have suggested that psoriasis is associated with individuals who are overweight or obese. Omentin is a recently discovered adipokine that is involved in chronic inflammatory processes. This study evaluated the relationship between omentin and psoriasis, focusing on omentin-1 serum levels, skin expression of omentin-1, and omentin-1 gene polymorphism (rs2274907; Val109Asp). Levels of omentin-1 in serum samples from 44 patients with psoriasis and 38 healthy controls were analyzed by enzyme-linked immunosorbent assay. The expressions of omentin-1 were measured by immunohistochemistry in 3 psoriasis affected skins and 3 normal skins. The rs2274907 variant was typed using a SNaPshot assay in 354 cases and 214 controls. We found significantly lower serum levels of omentin-1 in psoriasis patients compared with healthy controls (p < 0.001) with an inverse correlation with the Psoriasis Area and Severity Index (p < 0.01). The comparison of genotype and allele distribution revealed no significant difference in genotype frequency between psoriasis patients and controls. Therefore, omentin-1 may have a role in the pathogenesis of psoriasis and might be a potential biological marker for psoriasis severity.