[In vitro anti-myeloma effects induced by myeloma idiotype-protein pulsed dendritic cell vaccine].
OBJECTIVE
To investigate the specific antitumor immune response induced by idiotype protein (Id)-pulsed dendritic cells (DC) in vitro.


METHODS
DC was generated from peripheral blood monocytes of the multiple myeloma (MM) patients using GM-CSF, IL-4, and TNF-alpha. The DCs were pulsed with idiotypic fragment, the F(ab')2 fragment of M protein from MM patient at the immature stage. The morphologic characteristics of the cells were observed with light and electron microscopes. The phenotypic features were analyzed with FACS, MTT assay was employed to evaluate the proliferation of autologous T cells and the inhibition rate of MM cells.


RESULTS
DC precursors in peripheral blood could be induced to typical mature DC in medium containing GM-CSF, IL-4 and TNF-alpha. Mature DC with Id could increase the proliferation of the autologous T cells and activate naive T cells to become tumor specialized cytotoxic T lymphocytes (CTL). The CTL at different doses showed significant inhibition on or killing ability to autologous MM cells in vitro.


CONCLUSIONS
In a suitable cytokine environment, the DC precursors from peripheral blood of MM patients could be induced to functional DC, and vaccination of Id-pulsed DC could induce active antitumor immune response.
Department of Hematology, First Hospital of Xi'an Jiaotong University, Xi'an 710061, China.
Mei
M
Zhang
Xiao-Ran
XR
Yin
Yun-Ya
YY
Luo
Xiu
X
Lin
Meng-Chang
MC
Wang
Peng-Cheng
PC
He
Jing
J
Li
Gui-Li
GL
Guo
Rui-Ho
RH
Cai
Ya-lin
YL
Liu
D000328:Adult; D000368:Aged; D000888:Antibodies, Anti-Idiotypic / Q000276:immunology*; D019496:Cancer Vaccines / Q000276:immunology*; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000276:immunology*; D005260:Female; D006801:Humans; D016233:Immunotherapy, Active; D008297:Male; D008875:Middle Aged; D009101:Multiple Myeloma / Q000276:immunology* / Q000628:therapy; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology
D000888:Antibodies, Anti-Idiotypic; D019496:Cancer Vaccines