The establishment of dendritic cell-tumor fusion vaccines for hormone refractory prostate cancer cell.
OBJECTIVE
Dendritic cell (DC)-based tumor vaccine is an attractive modality for the treatment of hormone-refractory prostate cancer (HRPC) because it has some efficacy and few side effects in patients with poor general conditions. The aim of this study was to establish which is the most effective DC vaccine for the treatment of HRPC. We compared DC vaccine sensitized with tumor lysate and a fusion vaccine of DCs and tumor cells.


METHODS
The DU145 cancer cell line was purchased from the American Type Culture Collection. DCs were cultured from peripheral blood monocytes. Peripheral blood monocytes were cultured in RPMI 1640 medium supplemented with interleukin-4 (IL-4), granulocyte-macrophage colony-stimulating factor, and 10% fetal calf serum. Tumor necrosis factor-alpha was added on day 7 to support maturation. Functional activity was measured in three groups: the DC single-culture group, the DC culture group with DC vaccine sensitized with tumor lysates, and the DC culture group prepared with tumor fusion vaccine made from irradiated tumor cells and monocyte-derived DCs by the polyethylene glycol method.


RESULTS
By FACS analysis, the rate of DC-tumor fusion vaccine was 20.3+/-3%. The IL-12 level produced by the DC-tumor fusion vaccine was significantly higher than that of DCs pulsed with tumor lysate (p<0.05). Also, the generation of interferon-gamma by tumor-specific T cells in the DC-tumor fusion vaccine group was superior to that of DCs pulsed with tumor lysate (p<0.05). In addition, the T cells of the tumor lysate-pulsed DCs and tumor fusion vaccine had 1.6 and 2.5 times the functional activity, respectively, of the DC single-culture group in killing tumor cells in the cytotoxicity assay.


CONCLUSIONS
The DC-tumor fusion vaccine seems to be more effective than DC single-culture or DC-tumor lysate vaccine in the treatment of HRPC.
Kim
Tae-Beom
TB
Department of Urology, Gachon University Gil Hospital, Incheon, Korea.
Park
Ho Ki
HK
Chang
Joo Hyun
JH
Choi
In Ho
IH
Kim
Khae Hawn
KH
Yoon
Sang Jin
SJ
Lee
Min Sung
MS
Jung
Han
H
Kim
Choung-Soo
CS