Abstract:
:Hypoxic tumor microenvironment makes cancer cells to be therapy-resistant and hypoxia-inducing factors (HIFs) play a central role in hypoxic adaptation. Especially, renal cell carcinoma (RCC) is often associated with von Hippel-Lindau (VHL) gene mutations, leading to up-regulation of HIFs. However, from a different point of view, this suggests the possibility that HIFs could be promising targets in anti-cancer therapy. In this study, we searched for HIF-1α-derived peptides that are able to induce RCC-reactive cytotoxic T lymphocytes (CTLs) from HLA-A24+ RCC patients. Among five peptides derived from HIF-1α, which were prepared based on the binding motif to the HLA-A24 allele, a HIF-1α278-287 peptide induced peptide-specific CTLs from peripheral blood mononuclear cells of HLA-A24+ RCC patients most effectively. In immunoblot assays, the expression of HIF-1α was lowly detected in whole and nuclear lysates of RCC cell lines even under normoxia (20% O2), and their expression in whole lysates was increased under hypoxia (1% O2). Additionally, HIF-1α278-287 peptide-stimulated T cells showed a higher cytotoxicity against HLA-A24+ HIF-1α-expressing RCC cells than against HLA-A24- HIF-1α-expressing RCC cells. The cytotoxicity was inhibited by the addition of HIF-1α278-287 peptide-pulsed cold target cells. Altogether, these results indicate that the HIF-1α278-287 peptide could be a candidate for peptide-based anti-cancer vaccines for HLA-A24+ RCC patients.
journal_name
Int Immunopharmacoljournal_title
International immunopharmacologyauthors
Minami T,Matsumura N,Sugimoto K,Shimizu N,De Velasco M,Nozawa M,Yoshimura K,Harashima N,Harada M,Uemura Hdoi
10.1016/j.intimp.2017.01.014subject
Has Abstractpub_date
2017-03-01 00:00:00pages
197-202eissn
1567-5769issn
1878-1705pii
S1567-5769(17)30022-Xjournal_volume
44pub_type
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