Cytokine with immunoregulatory activity. May promote the transition between innate and adaptive immunity. Induces the production of IgG(1) and IgG(3) in B-cells. May play a role in proliferation and maturation of natural killer (NK) cells in synergy with IL15. May regulate proliferation of mature B- and T-cells in response to activating stimuli. In synergy with IL15 and IL18 stimulates interferon gamma production in T-cells and NK cells (By similarity). During T-cell mediated immune response may inhibit dendritic cells (DC) activation and maturation.
"Mouse interleukin 21 can improve the anti-tumor effect of LAK cells." Guobing C., Jun D., Junsong C., Fenshu Z. Submitted (2003-10) to the EMBL/GenBank/DDBJ databases
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