Abstract
Current strategy for the blockade of molecules inhibiting T-cell immunity, the immune checkpoints (ICP), such as CTLA-4, PD-1, and B7-H1(PD-L1), using monoclonal antibodies (mAbs), showed significant clinical effects in cancer immunotherapy. In this kind of therapy, antibodies do not kill tumor cells directly, but block inhibitory signals for T lymphocytes, resulting in activation of the immune response cascade that eliminate malignant cells and lead to tumor degradation. However, the mAb preparations have some limitations, and the development of new low-molecular-weight antagonists (for example, peptides) is an important issue. In this study, we used peptide microarrays and phage display libraries to search for peptides that interact with the immune checkpoints. We found peptides that specifically bind CTLA-4, PD-1, B7-1, B7-2 and B7-H1(PD-L1) which play important role in the regulation of the immune responses. These synthetic peptides can be applied to the development of new immunomodulating drugs for cancer immunotherapy.
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Abbreviations
- CTLA-4:
-
the cytotoxic receptor 4 of a T-lymphocyte
- PD-1:
-
the receptor of the programmed cell death for a T-lymphocyte
- В7-1/2 and B7-H1(PD-L1):
-
ligands of the CTLA-4 and PD-1 receptors
- ICP:
-
immune checkpoint
- mAb:
-
monoclonal antibody
- TCR:
-
T-cellular receptor
- MHC:
-
major histocompatibility complex
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This article is published based on the report on the Contest of Young Scientists that was held during the VIII Russian Symposium Proteins and Peptides at the Institute of Bioorganic Chemistry in Moscow, September 18–22, 2017.
Original Russian Text © S.V. Podlesnykh, D.V. Shanshin, E.A. Kolosova, D.E. Murashkin, O.N. Shaprova, D.N. Shcherbakov, A.I. Chapoval, 2018, published in Bioorganicheskaya Khimiya, 2018, Vol. 44, No. 2, pp. 138–145.
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Podlesnykh, S.V., Shanshin, D.V., Kolosova, E.A. et al. Development of Search Strategy for Peptide Inhibitors of Immune Checkpoints. Russ J Bioorg Chem 44, 150–157 (2018). https://doi.org/10.1134/S1068162018020024
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DOI: https://doi.org/10.1134/S1068162018020024