Abstract:
:Cancer cells are subjected to constant selection by the immune system, meaning that tumors that become clinically manifest have managed to subvert or hide from immunosurveillance. Immune control can be facilitated by induction of autophagy, as well as by polyploidization of cancer cells. While autophagy causes the release of ATP, a chemotactic signal for myeloid cells, polyploidization can trigger endoplasmic reticulum stress with consequent exposure of the "eat-me" signal calreticulin on the cell surface, thereby facilitating the transfer of tumor antigens into dendritic cells. Hence, both autophagy and polyploidization cause the emission of adjuvant signals that ultimately elicit immune control by CD8+ T lymphocytes. We investigated the possibility that autophagy and polyploidization might also affect the antigenicity of cancer cells by altering the immunopeptidome. Mass spectrometry led to the identification of peptides that were presented on major histocompatibility complex (MHC) class I molecules in an autophagy-dependent fashion or that were specifically exposed on the surface of polyploid cells, yet lost upon passage of such cells through immunocompetent (but not immunodeficient) mice. However, the preferential recognition of autophagy-competent and polyploid cells by the innate and cellular immune systems did not correlate with the preferential recognition of such peptides in vivo. Moreover, vaccination with such peptides was unable to elicit tumor growth-inhibitory responses in vivo. We conclude that autophagy and polyploidy increase the immunogenicity of cancer cells mostly by affecting their adjuvanticity rather than their antigenicity.
journal_name
Immunol Revjournal_title
Immunological reviewsauthors
Bloy N,Garcia P,Laumont CM,Pitt JM,Sistigu A,Stoll G,Yamazaki T,Bonneil E,Buqué A,Humeau J,Drijfhout JW,Meurice G,Walter S,Fritsche J,Weinschenk T,Rammensee HG,Melief C,Thibault P,Perreault C,Pol J,Zitvogel L,Sedoi
10.1111/imr.12582subject
Has Abstractpub_date
2017-11-01 00:00:00pages
165-174issue
1eissn
0105-2896issn
1600-065Xjournal_volume
280pub_type
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