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Trp2 Peptide Vaccine Adjuvanted with (R)-DOTAP Inhibits Tumor Growth in an Advanced Melanoma Model

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Division of Molecular Pharmaceutics, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
*Division of Molecular Pharmaceutics, Eshelman School of Pharmacy, Campus Box 7571, Kerr Hall, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599. E-mail: [email protected]. Phone: (919) 843 073. Fax: (919) 966 0197.
Cite this: Mol. Pharmaceutics 2012, 9, 2, 261–268
Publication Date (Web):December 5, 2011
Copyright © 2011 American Chemical Society

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    Previously we have shown cationic lipid (R)-DOTAP as the immunologically active enantiomer of the DOTAP racemic mixture, initiating complete tumor regression in an exogenous antigen model (murine cervical cancer model). Here, we investigate the use of (R)-DOTAP as an efficacious adjuvant delivering an endogenous antigen in an aggressive murine solid tumor melanoma model. (R)-DOTAP/Trp2 peptide complexes showed decreasing size and charge with increasing peptide concentration, taking a rod shape at highest concentrations. The particles were stable for 2 weeks at 4 °C. A dose of 75 nmol of Trp2 (formulated in (R)-DOTAP) was able to show statistically significant tumor growth delay compared to lower doses of 5 and 25 nmol, which were no different than untreated tumors. (R)-DOTAP/Trp2 (75 nmol) treated mice also showed increased T cell IFN-γ secretion after restimulation with Trp2, as well as CTL activity in vivo. This vaccination group also showed the highest population of functionally active tumor-infiltrating lymphocytes, indicated by IFN-γ secretion after restimulation with Trp2. Thus, (R)-DOTAP has shown the ability to break tolerance as an adjuvant. Its activity to enhance immunogenicity of other tumor associated antigens should be studied further.

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