αvβ3-dependent cross-presentation of matrix metalloproteinase–2 by melanoma cells gives rise to a new tumor antigen

E. Godefroy,A. Moreau-Aubry,E. Diéz,B. Dréno,F. Jotereau,Y. Guilloux

Published 2005 in Journal of Experimental Medicine

ABSTRACT

A large array of antigens that are recognized by tumor-specific T cells has been identified and shown to be generated through various processes. We describe a new mechanism underlying T cell recognition of melanoma cells, which involves the generation of a major histocompatibility complex class I–restricted epitope after tumor-mediated uptake and processing of an extracellular protein—a process referred to as cross-presentation—which is believed to be restricted to immune cells. We show that melanoma cells cross-present, in an αvβ3-dependent manner, an antigen derived from secreted matrix metalloproteinase–2 (MMP-2) to human leukocyte antigen A*0201-restricted T cells. Because MMP-2 activity is critical for melanoma progression, the MMP-2 peptide should be cross-presented by most progressing melanomas and represents a unique antigen for vaccine therapy of these tumors.

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