Chemokine receptor targeting efficiently directs antigens to MHC class I pathways and elicits antigen-specific CD8+ T-cell responses

Blood
Roberta SchiavoArya Biragyn

Abstract

Chemokines are key controllers of cell trafficking and are involved in numerous pathologic and inflammatory conditions. However, the fate of a chemokine ligand, once it is endocytosed with its receptor, remains obscure. Here, using chemokine-tumor antigen fusion constructs, we demonstrate for the first time that chemokines are internalized to early/late endosomal and lysosomal compartments through a clathrin-dependent process and subsequently delivered to the cytosol for proteasomal processing, facilitating efficient cross-presentation to the TAP-1-dependent MHC class I processing pathway. These data not only elucidate the intracellular fate of chemokine ligands upon receptor uptake, but also demonstrate the superior carrier potency of chemokines for delivering self-antigens to both class I and II processing pathways to induce CD8(+) and CD4(+) T-cell responses.

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Citations

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