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EphA2-derived peptide vaccine with amphiphilic poly(γ-glutamic acid) nanoparticles elicits an anti-tumor effect against mouse liver tumor

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Abstract

The prognosis of liver cancer remains poor, but recent advances in nanotechnology offer promising possibilities for cancer treatment. Novel adjuvant, amphiphilic nanoparticles (NPs) composed of l-phenylalanine (Phe)-conjugated poly(γ-glutamic acid) (γ-PGA-Phe NPs) having excellent capacity for carrying peptides, were found to have the potential for use as a peptide vaccine against tumor models overexpressing artificial antigens, such as ovalbumin (OVA). However, the anti-tumor potential of γ-PGA-Phe NPs vaccines using much less immunogenic tumor-associated antigen (TAA)-derived peptide needs to be clarified. In this study, we evaluated the effectiveness of immunization with EphA2, recently identified TAA, derived peptide-immobilized γ-PGA-Phe NPs (Eph-NPs) against mouse liver tumor of MC38 cells (EphA2-positive colon cancer cells). Immunization of normal mice with Eph-NPs resulted in generation of EphA2-specific type-1 CD8+ T cells. Immunization with Eph-NPs tended to provide a degree of anti-MC38 liver tumor protection more than that observed for immunization with the mixture of EphA2-derived peptide and complete Freund’s adjuvant (Eph + CFA). Neither Eph-NPs nor Eph + CFA vaccines inhibited tumor growth of BL6, EphA2-negative melanoma cells. Splenocytes isolated from MC38-bearing mice treated with Eph-NPs showed strong and specific cytotoxic activity against MC38 cells. Immunization with Eph + CFA induced liver damage as evidenced by elevation of serum alanine aminotransferase, while Eph-NPs vaccination did not exhibit any toxic damage to the liver. These results demonstrated that immunization with Eph-NPs displayed anti-tumor effects against liver tumor by generating acquired immunity equivalent to the toxic adjuvant CFA, suggesting that safe γ-PGA-Phe NPs could be applied clinically for the vaccine treatment of liver cancer.

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Abbreviations

IFA:

Incomplete Freund’s adjuvant

NPs:

Nanoparticles

γ-PGA:

Poly(γ-glutamic acid)

Phe:

l-Phenylalanine

CFA:

Complete Freund’s adjuvant

PBS:

Phosphate buffered saline

i.p.:

Intraperitoneal

ALT:

Alanine aminotransferase

DCs:

Dendritic cells

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Acknowledgments

This work was supported by a Grant-in-Aid from Core Research for Evolutional Science and Technology (CREST) from Japan Science and Technology Agency (JST).

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Correspondence to Tomohide Tatsumi.

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S. Yamaguchi and T. Tatsumi contributed equally to this work.

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Yamaguchi, S., Tatsumi, T., Takehara, T. et al. EphA2-derived peptide vaccine with amphiphilic poly(γ-glutamic acid) nanoparticles elicits an anti-tumor effect against mouse liver tumor. Cancer Immunol Immunother 59, 759–767 (2010). https://doi.org/10.1007/s00262-009-0796-2

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