[The cytotoxicity of CIK/NK cells stimulated by K562-DC fusion vaccines in NOD/SCID mice model for human erythroleukemia].
OBJECTIVE
To study the in vivo efficacy and the safety of cord blood derived CIK/NK cells stimulated by K562-dendritic cells (DC) fusion vaccines in NOD/SCID mice model for human erythroleukemia.


METHODS
DC and CIK /NK cells were both derived from cord blood mononuclear cells. DC were fused with inactivated K562 leukemia cell by PEG to produce K562-DC fusion vaccines. K562-DC fusion vaccines were co-cultured with CIK/NK cells to prepare K562-DC fusion vaccine stimulated CIK/NK cells. NOD/SCID mice were inoculated with 1 x 10(6) K562 cells. 24 hours later, 1 x 10(7) vaccines stimulated CIK/ NK cells and 1 x 10(7) CIK/NK cells were transfused into the NOD/SCID mice. NOD/SCID mice without inoculation of K562 cells were used as control group. CD13 and CD56 positive cells were assayed by flow cytometry.


RESULTS
All the leukemia NOD/SCID mice without therapy died within 39 days, tumor was found in 5 of 8 mice. One of 8 leukemia mice treated with K562-DC fusion vaccines stimulated CIK/NK cells died at the 65th day, the anti-tumor response rate was 87.5%. Two of the leukemia mice treated with CIK/NK cells died at the 56th and 65th day respectively, the anti-tumor response rate was 75%. There was no significant difference in survival time between these two groups, and both survivals were longer than that of the control group. There was no significant difference in CD13 positive cells in the survival mice between these two groups, and both of that were less than that of the control mice. There was no significant difference in CD56 positive cells between the two treated groups and the control group.


CONCLUSIONS
Cord blood derived CIK/ NK cells stimulated by inactivated tumor cells retain the cytotoxicity and do not develop tumor in vivo.
Pediatric Department, Second Affiliated Hospital, SUN Yat-sen University, Guangzhou 510120, China.
Yang
Y
Li
Shao-Liang
SL
Huang
Xu-Chao
XC
Zhang
Jian-Pei
JP
Fang
Yan-Feng
YF
Wu
Jing
J
Wei
Wen-Ge
WG
Huang
Dun-Hua
DH
Zhou
Ke
K
Huang
Yong-Chao
YC
Lin
D000818:Animals; D019496:Cancer Vaccines / Q000276:immunology*; D055612:Cytokine-Induced Killer Cells / Q000276:immunology*; D003602:Cytotoxicity, Immunologic; D003713:Dendritic Cells / Q000276:immunology*; D006801:Humans; D020014:K562 Cells; D007694:Killer Cells, Natural / Q000276:immunology*; D004915:Leukemia, Erythroblastic, Acute / Q000276:immunology*; D051379:Mice; D016688:Mice, Inbred NOD; D016513:Mice, SCID
D019496:Cancer Vaccines