Adenoviral-mediated transfer of human wild-type p53, GM-CSF and B7-1 genes results in growth suppression and autologous anti-tumor cytotoxicity of multiple myeloma cells in vitro |
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Authors: | Su-Ping Ren Chu-Tse Wu Wen-Rong Huang Zhuo-zhuang Lu Xiang-Xu Jia Lan Wang Miao-Fen Lao Li-Sheng Wang |
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Institution: | (1) Department of Experimental Hematology, Beijing Institute of Radiation Medicine, 27 Taiping Road, Beijing, 100850, People’s Republic of China |
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Abstract: | Multiple myeloma (MM) remains incurable despite the use of high-dose chemotherapy and stem cell transplantation. However,
immunotherapy is expected to offer long-term disease control, or even possibly a cure. We have previously demonstrated the
suppressive effect of a recombinant adenovirus carrying human wild-type p53, granulocyte–macrophage colony-stimulating factor,
and B7-1 genes (Ad-p53/GM-CSF/B7-1) on the growth of laryngeal cancer cells. In the present study, we evaluated the effects
of an Ad-p53/GM-CSF/B7-1-modified myeloma cell vaccine strategy aimed to induce apoptosis and to augment the immunogenicity
of MM cells. Both MM cell lines and purified primary myeloma cells were infected with Ad-p53/GM-CSF/B7-1. High expression
levels of these three genes were confirmed separately by Western blot, enzyme-linked immunosorbent assay (ELISA), and flow
cytometry. When wild-type p53, GM-CSF and B7-1 genes were introduced, the growth of MM cells was inhibited via enhanced apoptosis
and the immunogenicity of tumor cells was augmented. The combinatorial effect of these three genes on inducing cytotoxic T
lymphocytes (CTLs) was more evident than that of p53 individually or any combinations of two (p53 plus GM-CSF or p53 plus
B7-1). Furthermore, significant proliferation of autologous peripheral blood lymphocytes (PBLs) and specific cytotoxicity
against autologous primary MM cells were induced in vitro. These results suggest that myeloma cell vaccination co-transferred
with p53, GM-CSF and B7-1 genes may be a promising immunotherapeutic approach against MM. |
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Keywords: | Multiple myeloma Adenoviral vector p53 tumor suppressor gene Granulocyte-macrophage colony-stimulating factor B7-1 costimulatory molecule Immunotherapy |
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