A novel cyclic peptide targeting LAG-3 for cancer immunotherapy by activating antigen-specific CD8+ T cell responses
| العنوان: | A novel cyclic peptide targeting LAG-3 for cancer immunotherapy by activating antigen-specific CD8+ T cell responses |
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| المؤلفون: | Yuanming Qi, Guodong Li, Hongfei Wang, Xinghua Sui, Yanfeng Gao, Guanyu Chen, Wanqiong Li, Wenjie Zhai, Xiuman Zhou |
| المصدر: | Acta Pharmaceutica Sinica. B Acta Pharmaceutica Sinica B, Vol 10, Iss 6, Pp 1047-1060 (2020) |
| بيانات النشر: | Elsevier, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Original article, T cell, medicine.medical_treatment, Cancer immunotherapy, 03 medical and health sciences, 0302 clinical medicine, LAG-3, medicine, Cytotoxic T cell, MTT assay, General Pharmacology, Toxicology and Pharmaceutics, 030304 developmental biology, 0303 health sciences, biology, Chemistry, lcsh:RM1-950, FOXP3, Immune checkpoint, medicine.anatomical_structure, lcsh:Therapeutics. Pharmacology, 030220 oncology & carcinogenesis, biology.protein, Cancer research, Cyclic peptide, Phage display, Antibody, CD8+ T cell, CD8, Immune checkpoint blockade |
| الوصف: | PD-1 and CTLA-4 antibodies offer great hope for cancer immunotherapy. However, many patients are incapable of responding to PD-1 and CTLA-4 blockade and show low response rates due to insufficient immune activation. The combination of checkpoint blockers has been proposed to increase the response rates. Besides, antibody drugs have disadvantages such as inclined to cause immune-related adverse events and infiltration problems. In this study, we developed a cyclic peptide C25 by using Ph.D.-C7C phage display technology targeting LAG-3. As a result, C25 showed a relative high affinity with human LAG-3 protein and could effectively interfere the binding between LAG-3 and HLA-DR (MHC-II). Additionally, C25 could significantly stimulate CD8+ T cell activation in human PBMCs. The results also demonstrated that C25 could inhibit tumor growth of CT26, B16 and B16-OVA bearing mice, and the infiltration of CD8+ T cells was significantly increased while FOXP3+ Tregs significantly decreased in the tumor site. Furthermore, the secretion of IFN-γ by CD8+ T cells in spleen, draining lymph nodes and especially in the tumors was promoted. Simultaneously, we exploited T cells depletion models to study the anti-tumor mechanisms for C25 peptide, and the results combined with MTT assay confirmed that C25 exerted anti-tumor effects via CD8+ T cells but not direct killing. In conclusion, cyclic peptide C25 provides a rationale for targeting the immune checkpoint, by blockade of LAG-3/HLA-DR interaction in order to enhance anti-tumor immunity, and C25 may provide an alternative for cancer immunotherapy besides antibody drugs. Graphical abstract Cyclic peptide C25 targeting LAG-3 was developed by phage display bio-panning. C25 binds to LAG-3 and is capable of preventing the binding of LAG-3 to HLA-DR. C25 exhibits significant anti-tumor activity dependent on CD8+ T cells activation. Surprisingly, it can also lead to the reduction of Tregs in tumor microenvironment.Image 1 |
| اللغة: | English |
| تدمد: | 2211-3843 2211-3835 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5d5371ad86abe5d20d04e1887e733eb2Test http://europepmc.org/articles/PMC7332792Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....5d5371ad86abe5d20d04e1887e733eb2 |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 22113843 22113835 |
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