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Title: A novel HLA-B18 restricted CD8+ T cell epitope is efficiently cross-presented by dendritic cells from soluble tumor antigen.
Austin Authors: Zhao, Rona Y;Mifsud, Nicole A;Xiao, Kun;Chan, Kok-Fei;Oveissi, Sara;Jackson, Heather M;Dimopoulos, Nektaria;Guillaume, Philippe;Knights, Ashley J;Lowen, Tamara;Robson, Neil C;Russell, Sarah E;Scotet, Emmanuel;Davis, Ian D;Maraskovsky, Eugene;Cebon, Jonathan S ;Luescher, Immanuel F;Chen, Weisan
Affiliation: Ludwig Institute for Cancer Research, Melbourne Austin Branch, Austin Health, Heidelberg, Victoria, Australia
Issue Date: 6-Sep-2012
Publication information: PLoS One 2012; 7(9): e44707
Abstract: NY-ESO-1 has been a major target of many immunotherapy trials because it is expressed by various cancers and is highly immunogenic. In this study, we have identified a novel HLA-B*1801-restricted CD8(+) T cell epitope, NY-ESO-1(88-96) (LEFYLAMPF) and compared its direct- and cross-presentation to that of the reported NY-ESO-1(157-165) epitope restricted to HLA-A*0201. Although both epitopes were readily cross-presented by DCs exposed to various forms of full-length NY-ESO-1 antigen, remarkably NY-ESO-1(88-96) is much more efficiently cross-presented from the soluble form, than NY-ESO-1(157-165). On the other hand, NY-ESO-1(157-165) is efficiently presented by NY-ESO-1-expressing tumor cells and its presentation was not enhanced by IFN-γ treatment, which induced immunoproteasome as demonstrated by Western blots and functionally a decreased presentation of Melan A(26-35); whereas NY-ESO-1(88-96) was very inefficiently presented by the same tumor cell lines, except for one that expressed high level of immunoproteasome. It was only presented when the tumor cells were first IFN-γ treated, followed by infection with recombinant vaccinia virus encoding NY-ESO-1, which dramatically increased NY-ESO-1 expression. These data indicate that the presentation of NY-ESO-1(88-96) is immunoproteasome dependent. Furthermore, a survey was conducted on multiple samples collected from HLA-B18(+) melanoma patients. Surprisingly, all the detectable responses to NY-ESO-1(88-96) from patients, including those who received NY-ESO-1 ISCOMATRIX™ vaccine were induced spontaneously. Taken together, these results imply that some epitopes can be inefficiently presented by tumor cells although the corresponding CD8(+) T cell responses are efficiently primed in vivo by DCs cross-presenting these epitopes. The potential implications for cancer vaccine strategies are further discussed.
Gov't Doc #: 22970293
DOI: 10.1371/journal.pone.0044707
Journal: PLoS One
Type: Journal Article
Subjects: Blotting, Western
CD8-Positive T-Lymphocytes.immunology
Cell Line, Tumor
Dendritic Cells.immunology
HLA-B18 Antigen.immunology
Appears in Collections:Journal articles

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