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Article Open Access

Point mutation screening of tumor neoantigens and peptide‑induced specific cytotoxic T lymphocytes using The Cancer Genome Atlas database

  • Authors:
    • Wanwen Wu
    • Ying Chen
    • Lan Huang
    • Wenjian Li
    • Changli Tao
    • Han Shen
  • View Affiliations / Copyright

    Affiliations: Guangdong Province Key Laboratory for Biotechnology Drug Candidates, School of Life Sciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, Guangdong 510006, P.R. China
    Copyright: © Wu et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 123
    |
    Published online on: August 19, 2020
       https://doi.org/10.3892/ol.2020.11986
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Abstract

The aim of the present study was to use The Cancer Genome Atlas (TCGA) database to identify tumor neoantigens, combined with a bioinformatics analysis to design and analyze antigen epitope peptides. Epitopes were screened using immunogenicity tests to identify the ideal epitope peptides to target tumor neoantigens, which can specifically activate the immune response of T cells. The high‑frequency mutation loci (top 10) of colorectal, lung and liver cancer genes were screened using TCGA database. The antigenic epitope peptides with high affinity for major histocompatibility complex molecules were selected and synthesized using computer prediction algorithms, and were subsequently detected using flow cytometry. The cytotoxicity of specific cytotoxic T lymphocytes (CTLs) on peptide‑loaded T2 cells was initially verified using interferon IFN‑γ detection and a calcein‑acetoxymethyl (Cal‑AM) release assay. Tumor cell lines expressing point mutations in KRAS, TP53 and CTNNB1 genes were constructed respectively, and the cytotoxicity of peptide‑induced specific CTLs on wild‑type and mutant tumor cells was verified using a Cal‑AM release assay and carboxyfluorescein succinimidyl ester‑propidium iodide staining. The high‑frequency gene mutation loci of KRAS proto‑oncogene (KRAS) G12V, tumor protein p53 (TP53) R158L and catenin β1 (CTNNB1) K335I were identified in TCGA database. A total of 3 groups of wild‑type and mutant peptides were screened using a peptide prediction algorithm. The CTNNB1 group had a strong affinity for the human leukocyte antigen‑A2 molecule, as determined using flow cytometry. The IFN‑γ secretion of specific CTLs in the CTNNB1 group was the highest, followed by the TP53 and the KRAS groups. The killing rate of mutant peptide‑induced specific CTLs on peptide‑loaded T2 cells in the CTNNB1 group was higher compared with that observed in the other groups. The killing rate of specific CTLs induced by mutant peptides present on tumor cells was higher compared with that induced by wild‑type peptides. However, when compared with the TP53 and KRAS groups, specific CTLs induced by mutant peptides in the CTNNB1 group had more potent cytotoxicity towards mutant and wild‑type tumor cells. In conclusion, point mutant tumor neoantigens screened in the three groups improved the cytotoxicity of specific T cells, and the mutant peptides in the CTNNB1 group were more prominent, indicating that they may activate the cellular immune response more readily.
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Copy and paste a formatted citation
Spandidos Publications style
Wu W, Chen Y, Huang L, Li W, Tao C and Shen H: Point mutation screening of tumor neoantigens and peptide‑induced specific cytotoxic T lymphocytes using The Cancer Genome Atlas database. Oncol Lett 20: 123, 2020.
APA
Wu, W., Chen, Y., Huang, L., Li, W., Tao, C., & Shen, H. (2020). Point mutation screening of tumor neoantigens and peptide‑induced specific cytotoxic T lymphocytes using The Cancer Genome Atlas database. Oncology Letters, 20, 123. https://doi.org/10.3892/ol.2020.11986
MLA
Wu, W., Chen, Y., Huang, L., Li, W., Tao, C., Shen, H."Point mutation screening of tumor neoantigens and peptide‑induced specific cytotoxic T lymphocytes using The Cancer Genome Atlas database". Oncology Letters 20.5 (2020): 123.
Chicago
Wu, W., Chen, Y., Huang, L., Li, W., Tao, C., Shen, H."Point mutation screening of tumor neoantigens and peptide‑induced specific cytotoxic T lymphocytes using The Cancer Genome Atlas database". Oncology Letters 20, no. 5 (2020): 123. https://doi.org/10.3892/ol.2020.11986
Copy and paste a formatted citation
x
Spandidos Publications style
Wu W, Chen Y, Huang L, Li W, Tao C and Shen H: Point mutation screening of tumor neoantigens and peptide‑induced specific cytotoxic T lymphocytes using The Cancer Genome Atlas database. Oncol Lett 20: 123, 2020.
APA
Wu, W., Chen, Y., Huang, L., Li, W., Tao, C., & Shen, H. (2020). Point mutation screening of tumor neoantigens and peptide‑induced specific cytotoxic T lymphocytes using The Cancer Genome Atlas database. Oncology Letters, 20, 123. https://doi.org/10.3892/ol.2020.11986
MLA
Wu, W., Chen, Y., Huang, L., Li, W., Tao, C., Shen, H."Point mutation screening of tumor neoantigens and peptide‑induced specific cytotoxic T lymphocytes using The Cancer Genome Atlas database". Oncology Letters 20.5 (2020): 123.
Chicago
Wu, W., Chen, Y., Huang, L., Li, W., Tao, C., Shen, H."Point mutation screening of tumor neoantigens and peptide‑induced specific cytotoxic T lymphocytes using The Cancer Genome Atlas database". Oncology Letters 20, no. 5 (2020): 123. https://doi.org/10.3892/ol.2020.11986
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