[Effect of Achyranthes bidentata polysaccharides stimulated dendritic cells co-cultured with cytokine induced killer cells against SW480 cells].

Achyranthes bidentata polysaccharides (ABPS) was extracted from the root of A. bidentata. Dendritic cells (DC), which were stimulated with ABPS and/or tumor antigen SW480, were co-cultured with cytokine induced killer cells (CIK) to test the cytotoxic effect on colon cancer cell line SW480. Peripheral blood mononuclear cells (PBMNCs) which were separated from human peripheral blood were cultured to DC and CIK separately. (1) DC were divided into four groups: pure DC served as control group; ABPS (50 mg x L(-1)) stimulated DC served as experimental group; SW480 tumor antigen stimulated DC served as the second experimental group; ABPS (50 mg x L(-1)) and SW480 tumor antigen co-stimulated DC served as the third experimental group. Flow cytometry was used to detect the difference of the positive rate of molecules in the cell surface of DC, include CD80, CD86, CD1c, CD40, HLA-DR (6 samples for each group). (2) The four DC groups were mixed with CIK at the ratio 1:5 and acted as effect cells (DC + CIK groups), and the colon cancer cell line SW480 acted as target cells. The effect cells and the target cells were mixed together at the ratio 30: 1, 20:1 and 10:1 separately, and the CCK-8 kit was used to test the cytotoxic effect on colon cancer cell line SW480. (3) At the mixing ratio 30:1 of effect cells and target cells, ELISA was used to test the level of cytokines secretion, including IL-2, IL-12p70, IL-17 and TNF-alpha, in the liquid supernatant of every test group (3 duplication per sample). The results showed as following: (1) The positive rates of CD80, CD11c, HLA-DR, in the cell surface of DC which was co-stimulated by ABPS (50 mg x L(-1)) and SW480 tumor antigen, were obviously higher than the other DC groups (P < 0.05), and the positive rates of CD86, CD40 were obviously higher than the pure DC group (P < 0.05), and there was no remarkable difference with the other two DC groups. (2) At the mixing ratio 30:1, 20:1 and 10:1 of the effect cells and the target cells, the cytotoxic effect of ABPS stimulated DC + CIK group and SW480 tumor antigen stimulated DC + CIK group was obviously higher than DC + CIK group (P < 0.05), the cytotoxic effect of ABPS and SW480 tumor antigen co-stimulated DC + CIK group was obviously higher than all the other groups. (3) At the mixing ratio 30:1 of the effect cells and the target cells, the secretion levels of IL-12p70 and TNF-alpha in the liquid supernatant of the ABPS and SW480 tumor antigen co-stimulated DC + CIK group were obviously higher than all the other groups (P < 0.05), the secretion levels of IL-2 and IL-17 in the liquid supernatant of every test group have no remarkable difference. The cytotoxic effect of ABPS stimulated DC + CIK on SW480 was obviously increased. The cytotoxic effect of ABPS and SW480 tumor antigen co-stimulated DC + CIK group was obviously higher than all the other.