التفاصيل البيبلوغرافية
| العنوان: |
ATOR-1017 (evunzekibart), an Fc-gamma receptor conditional 4-1BB agonist designed for optimal safety and efficacy, activates exhausted T cells in combination with anti-PD-1. |
| المؤلفون: |
Enell Smith, Karin, Fritzell, Sara, Nilsson, Anneli, Barchan, Karin, Rosén, Anna, Schultz, Lena, Varas, Laura, Säll, Anna, Rose, Nadia, Håkansson, Maria, von Schantz, Laura, Ellmark, Peter |
| المصدر: |
Cancer Immunology, Immunotherapy; Dec2023, Vol. 72 Issue 12, p4145-4159, 15p |
| مصطلحات موضوعية: |
T-cell exhaustion, KILLER cells, IMMUNOLOGIC memory, T cells, IMMUNE checkpoint inhibitors |
| مستخلص: |
Background: 4-1BB (CD137) is a co-stimulatory receptor highly expressed on tumor reactive effector T cells and NK cells, which upon stimulation prolongs persistence of tumor reactive effector T and NK cells within the tumor and induces long-lived memory T cells. 4-1BB agonistic antibodies have been shown to induce strong anti-tumor effects that synergize with immune checkpoint inhibitors. The first generation of 4-1BB agonists was, however, hampered by dose-limiting toxicities resulting in suboptimal dose levels or poor agonistic activity. Methods: ATOR-1017 (evunzekibart), a second-generation Fc-gamma receptor conditional 4-1BB agonist in IgG4 format, was designed to overcome the limitations of the first generation of 4-1BB agonists, providing strong agonistic effect while minimizing systemic immune activation and risk of hepatoxicity. The epitope of ATOR-1017 was determined by X-ray crystallography, and the functional activity was assessed in vitro and in vivo as monotherapy or in combination with anti-PD1. Results: ATOR-1017 binds to a unique epitope on 4-1BB enabling ATOR-1017 to activate T cells, including cells with an exhausted phenotype, and NK cells, in a cross-linking dependent, FcγR-conditional, manner. This translated into a tumor-directed and potent anti-tumor therapeutic effect in vivo, which was further enhanced with anti-PD-1 treatment. Conclusions: These preclinical data demonstrate a strong safety profile of ATOR-1017, together with its potent therapeutic effect as monotherapy and in combination with anti-PD1, supporting further clinical development of ATOR-1017. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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