AG490 reverses phenotypic alteration of dendritic cells by bladder cancer cells.

Past studies have confirmed that tumors can impair the function of dendritic cells (DCs) and promote tumor evasion. AG490, a Janus kinase 2/signal transducer and activator of transcription 3 inhibitor, has been shown to induce maturation of DCs and inhibit the growth of tumor cells. In the present study, DCs were generated from healthy human peripheral blood mononuclear cells. On day 5 of culture, the DCs were co-cultured with human bladder cancer pumc-91 cells for 24 h, and then purified using magnetic beads. The maturation of the DCs was induced by lipopolysaccharide. Subsequent to co-culture with pumc-91 cells, the expression of human leukocyte antigen-antigen D related (HLA-DR), cluster of differentiation (CD)86 and CD80 was found to be reduced in the DCs, accompanied by increased production of interleukin (IL)-10, but decreased production of IL-12p70. Furthermore, the DCs co-cultured with pumc-91 inhibited the proliferation of allogeneic T cells. Finally, AG490 restored the expression of HLA-DR, CD86 and CD80. These data identified that bladder cancer cells could inhibit the antigen-presenting function of the DCs and induce anergy in T cells. AG490 may partly reverse this inhibitory effect of bladder cancer cells on DCs, activate immunogenicity and induce the antitumor immunity response of DCs.