IL-27 plays an important function in regulating the activity of B- and T-lymphocytes. The effects of IL-27 are eliciting by its interaction with a specific cell-surface receptor complex composed of two proteins known as IL27R and gp130.
^Lucas S, Ghilardi N, Li J, de Sauvage FJ (December 2003). "IL-27 regulates IL-12 responsiveness of naive CD4+ T cells through Stat1-dependent and -independent mechanisms". Proceedings of the National Academy of Sciences of the United States of America100 (25): 15047–52. doi:10.1073/pnas.2536517100. PMC299900. PMID14657353.