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        mRNA Delivery to Human Dendritic Cells by Recombinant Yeast and Activation of Antigen-Specific Memory T Cells

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        The import of functional nucleic acids like messenger RNA into mammalian cells has proven to be a powerful tool in cell biology and several delivery systems have been described. However, as targeting of particular cell types is a major challenge and RNA vaccination represents a promising means for the induction of cellular immune responses, there is a need for novel delivery systems that permit the introduction of functional messenger RNA to the cytosol of immune cells. Here, we describe a delivery system based on the yeast Saccharomyces cerevisiae that allows the delivery of functional messenger RNA to mammalian antigen-presenting cells such as human dendritic cells. Further, we present a method to prove antigen processing and presentation by stimulation of human autologous T lymphocytes.
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