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Psoriasis is chronic autoimmune hyperproliferative skin disease with a population prevalence of 1.5-3%. The cause of psoriasis is still not fully understood. It has been hypothesized to be an immune-mediated disorder in which the excessive reproduction of keratinocytes is due to cytokines such as interferon (IFN)-gamma and tumour necrosis factor (TNF)-alpha, secreted by infiltrating CD4(+) and CD8(+) T cells and natural killer cells. The aim of our study was to determine the serum levels of TNF-α, IL-4, IL-6 &amp; IL-10 in psoriasis patients and compare it with healthy controls. 30 clinically diagnosed psoriasis patients and 30 age and sex matched healthy controls were included in the study. The serum cytokine levels were measured by solid phase sandwich ELISA (DIACLONE Research, France). TNF-α and IL-6 levels were significantly raised in patients and the results were statistically significant (P &lt; 0.001). IL-4 levels were higher in patients than in controls (1.91 ± 4.7 pg/ml in cases &amp; 0.9 ± 0.3 pg/ml in controls) but were not statistically significant. Interestingly, IL-10 levels were found to be higher in controls than in patients but again, it was not statistically significant. Pro-inflammatory cytokines play a pivotal role in the pathogenesis of psoriasis and it is the type 1(TH1) cytokine pattern, i.e., IL-6 &amp; TNF-α, which predominate in the psoriatic T cell response. Further studies on IL-10 levels in psoriasis are recommended to establish their exact role in the pathogenesis of the disease.

Serum Cytokine Profile in Psoriasis-A Case–Control Study in a Tertiary Care Hospital from Northern India