Human tankyrases are aberrantly expressed in colon tumors and contain multiple epitopes that induce humoral and cellular immune responses in cancer patients

Yuriy V. Shebzukhov, Inna N. Lavrik, Julia Karbach, Svetlana V. Khlgatian, Ekaterina P. Koroleva, Pavel V. Belousov, Kirill N. Kashkin, Alexander Knuth, Elke Jager, Nai Wen Chi, Dmitry V. Kuprash, Sergei A. Nedospasov

Research output: Contribution to journalArticlepeer-review

25 Scopus citations

Abstract

Purpose: Tankyrases 1 and 2 are telomere-associated poly(ADP-ribose) polymerases (PARP) that can positively regulate telomere elongation and interact with multiple cellular proteins. Recent reports implicated tankyrases as tumor antigens and potential targets of anticancer treatment. We examined expression of tankyrases in colon tumors and immune response to these enzymes in patients with different types of cancer. Methods: mRNA and protein expression was evaluated by quantitative real-time RT-PCR and Western blotting, respectively. Humoral immune response to recombinant tankyrases was investigated by modified enzyme-linked immunoassays. Cellular immune response was analysed by ELISPOT and 51Cr release assays. Results: We found that both mRNA and protein levels of tankyrase 2 (TNKL) are upregulated in colon tumors. In contrast, protein level of tankyrase 1 (TNKS) is downregulated, while mRNA level shows variable changes. More than a quarter of colon cancer patients develop humoral immune response to at least one of the two tankyrases. In this study we mapped common and unique B-cell epitopes located in different domains of the two proteins. Additionally, we present evidence for T-cell responses both to epitopes that are unique for TNKL and to those shared between TNKL and TNKS. Conclusion: Our study favors a biomarker usage of antibody response to tankyrases. Spontaneous CD8+ T-cell responses to these enzymes are rare and further investigation is needed to evaluate tankyrases as potential targets for cancer immunotherapy.

Original languageEnglish (US)
Pages (from-to)871-881
Number of pages11
JournalCancer Immunology, Immunotherapy
Volume57
Issue number6
DOIs
StatePublished - Jun 1 2008
Externally publishedYes

Keywords

  • Epitope mapping
  • SEREX
  • Telomerase-interacting proteins

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology
  • Oncology
  • Cancer Research

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