Cell mediated immune (CMI) responses are crucial for the clearance of human papillomavirus (HPV) infection and HPV-associated lesions. Activated CD8 T cells are critical effector cells in recognizing and killing HPV-infected or HPV-transformed cells. CD4 T cells provide help for priming the generation and maintenance of CD8 T cells as well as for tumors immunity. An ideal therapeutic HPV peptide-based vaccine should induce both a robust CD8 T-cell response as well as a CD4 T-cell response for ensuring their efficiency. Candida skin test reagent was demonstrated to be able to induce the secretion of IL-12 by Langerhans cells and T-cell proliferation in vitro by our group, which indicated the potential of Candida to enhance CMI response. In this current study, we designed a novel HPV peptide-based vaccine which includes HPV16 E7 peptides and Candida as an adjuvant. The immune responses induced by the vaccine were comprehensively evaluated. The results showed that the vaccine induced significant HPV-specific CD8 T-cell and Th1 CD4 T-cell responses as well as humoral immune response. It is interesting that Candida alone induced a significant polarization of Th1 response an production of IFN-γ, which indicated Candida alone may be used as a potential immunotherapeutic reagent not only for HPV-associated lesions but also for other viral infection or even cancers.
International Immunopharmacology – Elsevier
Published: Mar 1, 2018
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