4.6 Article

A therapeutic HPV16 E7 vaccine in combination with active anti-FGF-2 immunization synergistically elicits robust antitumor immunity in mice

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ELSEVIER
DOI: 10.1016/j.nano.2020.102254

Keywords

Virus-like particle (VLP); Fibroblast growth factor-2 (FGF-2); Anti-cytokine active immunization; Therapeutic vaccine; Human papillomavirus (HPV)

Funding

  1. CAMS Initiative for Innovative Medicine [2016-I2M-1-019]
  2. National Natural Science Foundation of China [81773270]
  3. Science and Technology Project of Yunnan Province [2016FA049]
  4. Fundamental Research Funds for Institute of Pathogen Biology of PUMC [2014IPB107]

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FGF-2 accumulates in many tumor tissues and is closely related to the development of tumor angiogenesis and the immunosuppressive microenvironment. This study aimed to investigate whether active immunization against FGF-2 could modify antitumor immunity and enhance the efficacy of an HPV16 E7-specific therapeutic vaccine. Combined immunization targeting both FGF-2 and E7 significantly suppressed tumor growth, which was accompanied by significantly increased levels of IFN-gamma-expressing splenocytes and effector CD8 T cells and decreased levels of immunosuppressive cells such as regulatory T cells (Tregs) and myeloid-derived suppressor cells(MDSCs) in both the spleen and tumor; in addition, the levels of FGF-2 and neovascularization in tumors were decreased in the mice receiving the combined immunization, and tumor cell apoptosis was promoted. The combination of an HPV16 E7-specific vaccine and active immunization against FGF-2 significantly enhances antitumor immune responses in mice with TC-1 tumors, indicating a promising strategy for tumor immunotherapy. (C) 2020 Elsevier Inc. All rights reserved.

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