[No authors listed]
Psoriasis is a common inflammatory skin disease with key immunological and genetic components. Recruitment of leukocytes into the skin is a central step in its pathogenesis, mediated by cytokines. Among the cytokines expressed in psoriatic lesions, C-C chemokine ligand 4 (CCL4) and C-C chemokine ligand 4-like (CCL4L) chemokines appear to be pivotal elements for the skin recruitment of proinflammatory cells. The aim of this study is to evaluate the relationship between CCL4L polymorphisms (including single-nucleotide polymorphisms (SNPs) and copy number variation (CNV)) and the course and prognosis of psoriasis. We analyzed the CNV and the rs4796195 SNP in 211 psoriatic patients and 234 controls; sera from both populations were also quantified for CCL4/CCL4L protein. Our results showed that a high CNV (â¥3 copies) is associated with psoriasis severity, whereas moderate disease correlated with a lower CNV (â¤2 copies); specifically, the CCL4L1 allele frequency is higher in severe psoriasis, whereas CCL4L2 is more frequent in patients with a milder disease. In addition, we found a positive correlation between the CNV and sera protein levels. Our results suggest that CCL4L genotyping could not only allow a better understanding of the psoriatic pathogenesis but could also be used as a prognostic tool, even helping to modulate the efficacy of treatments.
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