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Heit, A.* ; Schmitz, F.* ; Haas, T.* ; Busch, D.H. ; Wagner, H.*

Antigen co-encapsulated with adjuvants efficiently drive protective T cell immunity.

Eur. J. Immunol. 37, 2063-2074 (2007)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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Compared to "live" vaccines, the immunogenicity of "subunit" vaccines based on recombinant antigen (Ag) is poor, presumably because exogenous Ag fails to effectively access the endosomal Ag-processing pathways of Ag-presenting cells (APC). To overcome this limitation, we exploited biodegradable poly(lactic-co-glycolic) microspheres (MP) co-entrapping Ag and Toll-like receptor (TLR) 9 or 7 ligands as an endosomal delivery device. In vitro, microspheres were rapidly phagocytosed by APC and translocated into phago-endosomal compartments, followed by degradation of the Ag and concurrent activation of endosomal TLR. As a consequence, full maturation of and cytokine secretion by APC as well as Ag-cross-presentation ensued. In vivo, "loaded" microspheres triggered clonal expansion of primary and secondary Ag-specific CD4 and CD8 T cells. The efficacy of CD8 T cell cross-priming was comparable to that of live vectors. The potency of T cell vaccination was demonstrated by protective and therapeutic interventions using infection- and tumor-model systems. These preclinical "subunit" vaccination data thus recommend MP as a generally applicable and powerful endosomal delivery device of exogenous Ag plus TLR-based adjuvants to vaccinate for protective and therapeutic CD4 and CD8 T cell immunity.

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