Abstract
Naked DNA is an attractive tool for vaccination studies. We have studied naked DNA vaccination against the human tumor antigen mucin, encoded by the gene MUC1. C57/BL6 mice were immunized twice, on day 1 and day 10. with plasmid pCI-MUC1, intramuscularly. Five days after the last immunization tumor challenge experiments were performed using the tumor cell line MC38, expressing human MUC1. In 85% of mice immunized with the mucin plasmid tumor growth inhibition was observed, whereas control mice developed tumors. Re-tumor challenge after three months revealed no tumor growth in mice immunized with the mucin plasmid. These encouraging results, showing long-term protection against tumor growth, indicate the potential usefulness of naked DNA vaccination for clinical immunotherapy.
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