Superior anti-tumor protection and therapeutic efficacy of vaccination with allogeneic and semiallogeneic dendritic cell/tumor cell fusion hybrids for murine colon adenocarcinoma.
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| Abstract |
Cancer immunotherapy by dendritic cell (DC)/tumor cell fusion hybrids (DC/TC hybrids) has been shown to elicit potent anti-tumor effects via the induction of immune responses against multiple tumor-associated antigens. In the present study, we compared the anti-tumor effects of vaccinating Balb/c mice (H-2(d)) with CT26CL25 colon carcinoma cells that had been fused with either syngeneic DCs from Balb/c mice, allogeneic DCs from C57BL/6 mice (H-2(b)) or semiallogeneic DCs from B6D2F1 mice (H-2(b/d)). Preimmunization with either semiallogeneic or allogeneic DC/TC hybrids induced complete protection from tumor challenge, whereas mice preimmunized with syngeneic DC/TC hybrids were only partially protected (75% tumor rejection). The average number of pulmonary metastases after intravenous tumor injection decreased significantly following immunization with semiallogeneic or allogeneic DC/TC hybrids (8.3 +/- 7.9 or 16.3 +/- 3.5, mean +/- SD) relative to syngeneic DC/TC hybrids (67.8 +/- 6.3). These data demonstrate that vaccination with semiallogeneic DC/TC hybrids resulted in the greatest anti-tumor efficacy. Anti-tumor effects showed by in vivo studies were virtually accomplished by the frequency of induced CTLs specific to both gp70 and beta-galactosidase assessed by using pentameric assay. Among the fusion vaccines tested, semiallogeneic DC/TC hybrids induced the highest ratio of Th1 cytokine IFN-gamma to Th2 cytokine IL-10. In addition, allogeneic or semiallogeneic DC/TC hybrids elicited a significantly stronger NK activity than syngeneic DC/TC hybrids. These findings suggest that in clinical settings, DCs derived from a healthy donor (which are generally characterized as more semiallogeneic than allogeneic) may be more capable than autologous DCs of inducing promising anti-tumor effects in vaccinations with DC/TC hybrids.
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| Authors | Takashi Yasuda, Takashi Kamigaki, Kentaro Kawasaki, Tetsu Nakamura, Masashi Yamamoto, Kiyonori Kanemitsu, Shiro Takase, Daisuke Kuroda, Yongsik Kim, Tetsuo Ajiki, Yoshikazu Kuroda |
| Journal | Cancer immunology, immunotherapy : CII (Cancer Immunol Immunother) Vol. 56 Issue 7 Pg. 1025-36 (Jul 2007) ISSN: 0340-7004 [Print] Germany |
| PMID | 17131118 (Publication Type: Comparative Study, Journal Article) |
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