2013 Fiscal Year Final Research Report
Analyses for the establishment of the effective immunotherapy to melanoma-bearing hosts
| Project/Area Number |
23591613
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Dermatology
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| Research Institution | University of Yamanashi |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
INOZUME Takashi 山梨大学, 医学部附属病院, 助教 (80334853)
HANAWA Fumie 山梨大学, 医学部附属病院, 助教 (80535592)
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| Project Period (FY) |
2011 – 2013
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| Keywords | 腫瘍免疫 / 悪性黒色腫 / ワクチン |
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| Research Abstract |
We revealed that STAT3-restricted cytokines, especially IL-6 from B16 melanoma cells suppressed IFN-gamma-production in both CD4+ and CD8+ T-cells. In culture, IL-6 from B16 cells was reduced by pretreatment with rR9-GRIM19. In vivo, although intratumoral injections of rR9-GRIM19 elicited anti-B16 effects with frequencies of IL-6-producing T-cell phenotypes, complete B16 regression was not observed. To elicit complete B16 regression, we investigated the antitumor effects of combination immunotherapies with rR9-GRIM19. rR9-GRIM19 elicited enhanced antitumor effects when combined either with rR9-OVA or CpG-ODN, but only the combination of CpG-ODN, rR9-OVA, and rR9-GRIM19 (COG therapy) elicited complete B16 tumor regression. Interestingly, melanoma-specific cytotoxic T lymphocyte (CTL) expansion with IFN production occurred in COG-treated B16-bearing. We finally confirmed that rIFN exposure could significantly enhance rR9-GRIM19-treated anti-B16 melanoma effects in vitro and in vivo.
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