[Experimental induction of immunity by anti-idiotypic vaccines against small-cell-lung cancer].
OBJECTIVE
To investigate the efficacy of anti-idiotype antibody 3F6 and its single-chain variable fragment (3F6 ScFv) to induce humoral and cellular immune responses against small-cell-lung cancer (SCLC).


METHODS
3F6 and 3F6 ScFv (Ab2) were used to immunize BALB/c mice. The reaction of antibodies (Ab3) with specific antigen on NCI-H128 cells was tested by ELISA and Western blot, and the antibody binding inhibition assays were performed by competitive Western blot. Cellular immunity against SCLC induced by Ab2 was detected by a delayed-type hypersensitivity response and mouse lymphocyte proliferation assay.


RESULTS
The sera immunized with Ab2 showed significant reaction (P < 0.001, as compared to control sera) with SCLC-specific antigen on NCI-H128 cells and specifically competed the binding of 2F7 (Ab1) to the specific antigen. DTH responses challenged with NCI-H128 cells were significantly (P < 0.001) stronger in mice immunized with Ab2 as compared to mice immunized with normal mouse IgG. T cell proliferation was significantly higher in Ab2-immunized mice (P < 0.05) than in control mice.


CONCLUSIONS
The two kinds of anti-idiotypic antibodies successfully mimic the SCLC-specific antigen on NCI-H128 cell and induce strong humoral and cellular immune responses to SCLC-specific antigen in syngeneic mice. They may become novel vaccines against human small-cell-lung cancer and worthy of further investigation.
The Graduate School of Fudan University, Department of Cellular and Molecular Immunology, Shanghai Cancer Institute, Shanghai 200032, China.
Yong
Y
Li
Jing-ying
JY
Hu
Yi
Y
Zhang
Ming-jie
MJ
Zhu
Xin-tai
XT
Zhao
D000818:Animals; D000888:Antibodies, Anti-Idiotypic / Q000276:immunology*; D000912:Antibodies, Neoplasm / Q000276:immunology; D000951:Antigens, Neoplasm / Q000276:immunology; D019496:Cancer Vaccines / Q000276:immunology*; D018288:Carcinoma, Small Cell / Q000276:immunology*; D003602:Cytotoxicity, Immunologic / Q000187:drug effects; D007140:Immunoglobulin Fab Fragments / Q000276:immunology; D007128:Immunoglobulin Fragments / Q000276:immunology; D007135:Immunoglobulin Variable Region / Q000276:immunology; D008175:Lung Neoplasms / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C
D000888:Antibodies, Anti-Idiotypic; D000912:Antibodies, Neoplasm; D000951:Antigens, Neoplasm; D019496:Cancer Vaccines; D007140:Immunoglobulin Fab Fragments; D007128:Immunoglobulin Fragments; D007135:Immunoglobulin Variable Region; C055966:immunoglobulin Fv