tezolizumab blocks the interaction of PD-L1 with programmed cell death protein 1 (PD-1) and CD80 receptors (B7-1Rs). PD-L1 can be highly expressed on certain tumors, which is thought to lead to reduced activation of immune cells (cytotoxic T-cells in particular) that might otherwise recognize and attack the cancer.Inhibition of PD-L1 by atezolizumab can remove this inhibitor effect and thereby engender an anti-tumor response.
中文别名:
阿特朱单抗; 达雷木单抗
其他
适应症:
阿特朱单抗用于治疗在含铂化疗期间或之后病情恶化的转移性非小细胞肺癌。
药理作用及作用机制:
PD-L1可能被表达肿瘤细胞和/或肿瘤浸润免疫细胞上和可能对在肿瘤微环境中抗肿瘤免疫反应的抑制作用有贡献。PD-L1的结合至T细胞上发现PD-1和B7.1受体和抗原提呈细胞抑制细胞毒性T细胞活性,T-细胞增殖和细胞因子产生。阿特朱单抗是一个单克隆抗体结合至PD-L1和阻断它的与PD-1和B7.1受体两者相互作用。这个释放PD-L1/PD-1介导的免疫反应的抑制作用,包括抗肿瘤免疫反应的活化无诱导抗体依赖细胞细胞毒性。在同源小鼠肿瘤模型中,阻断PD-L1活性导致肿瘤生长减低。