Abstract
Tumor-associated peptides isolated by acid elution are frequently used for therapeutic immunization against various tumors both in mice and in humans. In acute myeloid leukemia (AML), the frequent accessibility of a large tumor burden allows for extraction of peptides from leukemia cells by using either citrate–phosphate (CP) or trifluoroacetic acid (TFA) buffer. To develop an optimal immunotherapeutic protocol for AML patients, we evaluated both in mice and in humans, the immunogenicity of peptides eluted from leukemia cells with the two acids (TFA or CP). Although ex vivo studies in mice showed that both prophylactic immunizations with mature dendritic cells (DC) loaded with TFA-peptides (DC/TFA), or CP-peptides (DC/CP), were able to stimulate specific antileukemia immune responses, only vaccination with DC/TFA was able to prevent leukemia outgrowth. Moreover, in humans, only DC/TFA generated significant antileukemia CD4+ and cytotoxic CD8+ T cell responses in vitro. In summary, these data demonstrate that the choice of the acid elution procedure to isolate immunogenic peptides strongly influences the efficacy of the antileukemia immune responses. These finding raise essential considerations for the development of immunotherapeutic protocols for cancer patients. In our model, our results argue for the use of the TFA elution method to extract immunogenic AML-associated peptides.
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Abbreviations
- Mature DC:
-
Mature dendritic cells
- TFA:
-
Trifluoroacetic acid
- CP:
-
Citrate–phosphate
- DC/TFA:
-
Mature dendritic cells loaded with peptides extracted from leukemia cells using TFA buffer
- DC/CP:
-
Mature dendritic cells loaded with peptides extracted from leukemia cells using CP buffer
- MST:
-
Median survival time
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Acknowledgements
The authors are grateful to Dr Francoise Audat who suggested patients for inclusion in the study, and to Emilie Floch’ for her technical support. We thank Franck Lagger for the intravenously injection of leukemia cells in mice. This work was supported by the “Institut National de la Santé et de la Recherche Médicale” (INSERM). The laboratory is associated with the “ligue contre le cancer”, Comité Ile de France. S. Delluc and L. Tourneur are supported by the “Fondation de France” (FDF), Comité Leucémie. S. Delluc received financial support from “France Intergroupe de la Leucémie Myéloïde Chronique” (FI LMC). The “Délégation régionale à la Recherche Clinique” (DRRC), and the “Société Française de Greffe de Moelle et de Thérapie Cellulaire” (SFGM-TC) promoted this study.
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Delluc, S., Tourneur, L., Fradelizi, D. et al. DC-based vaccine loaded with acid-eluted peptides in acute myeloid leukemia: the importance of choosing the best elution method. Cancer Immunol Immunother 56, 1–12 (2007). https://doi.org/10.1007/s00262-006-0170-6
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DOI: https://doi.org/10.1007/s00262-006-0170-6