Abstract
Human papillomavirus (HPV) infects large numbers of women worldwide and is present in more than 99% of all cervical cancer. TC-1 cell is a cell line with high expression of E7 antigen of HPV type 16 and its cell lysate has been demonstrated as an ideal inducer of E7-specific, antitumor immunity. OK-432 (Picibanil), a penicillin-killed Streptococcus pyogenes, has been reported with potent immunomodulation properties in cancer treatment by stimulating the maturation of dendritic cells (DCs) and secretion of Th-1 type cytokines. The current study demonstrated that a protocol to immunize the C57BL/6 mice with OK-432 followed by treatment with TC-1 lysate can generate markedly increased immune responses of E7-specific CD4+ T cells and a moderate increase of natural killer (NK) cell, as well as a satisfactorily protective and therapeutic antitumor effect by triggering the DCs to prime T cells. Depletion of lymphocyte subset in vivo suggested that the antitumor effects could be dominantly executed by CD8+ T cells and followed by NK cells, and both of these reactions were induced by the generation of robust E7-specific CD4+ T helper cell response. These findings warrant OK-432 combination with tumor-lysate as an effective and safe vaccine in future clinical application of cervical cancer.
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Chen, IJ., Yen, CF., Lin, KJ. et al. Vaccination With OK-432 Followed by TC-1 Tumor Lysate Leads to Significant Antitumor Effects. Reprod. Sci. 18, 687–694 (2011). https://doi.org/10.1177/1933719110396230
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DOI: https://doi.org/10.1177/1933719110396230