Dickkopf-1 (DKK1) is a widely expressed and potent tumor-associated antigen in multiple myeloma

Jianfei Qian, Jin Xie, Sungyoul Hong, Jing Yang, Liang Zhang, Xiaohong Han, Michael Wang, Fenghuang Zhan, John D. Shaughnessy, Joshua Epstein, Larry W. Kwak, Qing Yi

Research output: Contribution to journalArticle

89 Scopus citations

Abstract

The identification of novel tumor-associated antigens, especially those shared among patients, is urgently needed to improve the efficacy of immunotherapy for multiple myeloma (MM). In this study, we examined whether Dickkopf-1 (DKK1), a protein that is not expressed in most normal tissues but is expressed by tumor cells from almost all patients with myeloma, could be a good candidate. We identified and synthesized DKK1 peptides for human leukocyte antigen (HLA)-A*0201 and confirmed their immunogenicity by in vivo immunization in HLA-A*0201 transgenic mice.We detected, using peptide-tetramers, low frequencies of DKK1 peptide-specific CD8-positive (CD8+) T cells in patients with myeloma and generated peptide-specific T-cell lines and clones from HLA-A*0201-positive (HLA-A*0201+) blood donors and patients with myeloma. These T cells efficiently lysed peptide-pulsed but not unpulsed T2 or autologous dendritic cells, DKK1-positive (DKK1+)/HLA-A*0201+ myeloma cell lines U266 and IM-9, and, more importantly, HLA-A*0201 + primary myeloma cells from patients. No killing was observed on DKK1+/HLA-A*0201-negative (HLA-A*0201-) myeloma cell lines and primary myeloma cells or HLA-A*0201+ normal lymphocytes, including B cells. These results indicate that these T cells were potent cytotoxic T cells and recognized DKK1 peptides naturally presented by myeloma cells in the context of HLA-A*0201 molecules. Hence, our study identifies DKK1 as a potentially important antigen for immunotherapy in MM.

Original languageEnglish (US)
Pages (from-to)1587-1594
Number of pages8
JournalBlood
Volume110
Issue number5
DOIs
StatePublished - Sep 1 2007

ASJC Scopus subject areas

  • Biochemistry
  • Immunology
  • Hematology
  • Cell Biology

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