期刊
JOURNAL OF TRANSLATIONAL MEDICINE
卷 12, 期 -, 页码 -出版社
BMC
DOI: 10.1186/1479-5876-12-68
关键词
Melanoma; Tumor vaccine; Interleukin-21; miR200c; Zinc-finger E-box binding homeobox 1
资金
- National Natural Science Foundation of China [81071769, 81202372]
- 973 National Nature Science Foundation of People's Republic of China [2011CB933500]
Background: Genetically modified cells have been shown to be one of the most effective tumor vaccine strategies. However, in many cases, such as in melanoma, induction of a potent immune responses against the disease still remains a major challenge. Thus, novel strategies to reinforce tumor vaccine efficacy are needed. Using microRNA (miR) and Zinc-finger E-box binding homeobox (ZEB) have received much attention for potentially regulating tumor progression. To elicit a potent antitumor efficacy against melanoma, we used tumor vaccine in combination with miR200c overexpression or ZEB1 knockdown to assess the efficacy of treatment of murine melanoma. Methods: B16F10 cell vaccine expressing interleukin 21 (IL-21) in the glycosylpho-sphatidylinositol (GPI)-anchored form (B16F10/GPI-IL-21) were developed. The vaccine was immunized into mice challenged by B16F10 cells or B16F10 cells stably transduced with lentiviral-miR200c (B16F10/miR200c) or transfected with the ZEB1-shRNA recombinant (B16F10/shZEB1) or the B16F10/GPI-IL-21 vaccine. The immune responses, tumorigenicity and lung metastasis in mice were evaluated, respectively. Results: The vaccination with B16F10/GPI-IL-21 markedly increased the serum cytokine levels of IFN-gamma, TNF-alpha, IL-4 and decreased TGF-beta level as well as augmented the cytotoxicity of splenocytes in immunized mice compared with control mice. In addition, the tumor vaccine B16F10/GPI-IL-21 significantly inhibited the tumor growth and reduced counts of lung metastases in mice challenged by B16F10/GPI-IL-21, B16F10/shZEB1 and B16F10/miR200c respectively compared with the control mice challenged by B16F10 cells. The efficacy mechanisms may involve in reinforcing immune responses, increasing expression of miR200c, E-cadherin and SMAD-7 and decreasing expression of TGF-beta, ZEB1, Vimentin and N-cadherin in tumor tissues from the immunized mice. Conclusions: These results indicate that the tumor vaccine B16F10/GPI-IL-21 in combination with miR200c overexpression or ZEB1 knockdown effectively inhibited melanoma growth and metastasis a murine model. Such a strategy may, therefore, be used for the clinical trials.
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