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Science 27 April 2007:
Vol. 316. no. 5824, pp. 612 - 616
DOI: 10.1126/science.1137971
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Reports

Distinct Pathways of Antigen Uptake and Intracellular Routing in CD4 and CD8 T Cell Activation

Sven Burgdorf,* Andreas Kautz, Volker Böhnert, Percy A. Knolle, Christian Kurts*

The mechanisms that allow antigen-presenting cells (APCs) to selectively present extracellular antigen to CD8+ effector T cells (cross-presentation) or to CD4+ T helper cells are not fully resolved. We demonstrated that APCs use distinct endocytosis mechanisms to simultaneously introduce soluble antigen into separate intracellular compartments, which were dedicated to presentation to CD8+ or CD4+ T cells. Specifically, the mannose receptor supplied an early endosomal compartment distinct from lysosomes, which was committed to cross-presentation. These findings imply that antigen does not require intracellular diversion to access the cross-presentation pathway, because it can enter the pathway already during endocytosis.

Institute of Molecular Medicine and Experimental Immunology, Friedrich-Wilhelms-Universität, Bonn, Germany.

* To whom correspondence should be addressed. E-mail: ckurts{at}web.de (C.K.); sven.burgdorf{at}ukb.uni-bonn.de (S.B.)

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