Abstract: Interleukin-27 (IL-27),a cytokine belonging to the IL-12 family,plays an important role in the regulation of different types of immunocytes.It is a heterodimeric cytokine composed of two subunits,namely the p28 and Epstein-Barr virus (EBV)-induced gene 3 (EBi3),and is produced by activated antigen-presenting cells.Its receptor is composed of WSX-1 and gp130.IL-27 can bind to its receptor,then activate the signal transducer and activator of transcription (STAT) signaling pathway.With further insights into the role of IL-27 in the pathogenesis of psoriasis,IL-27 and its receptor may become new targets for the treatment of psoriasis.