in vitro and in vivo. SPECT/CT imaging with 99mTc-PEG6-RD-PDP2 showed that the A549-PD-L2 tumors were clearly visualized, whereas the signals in PD-L2-negative A549 tumors were much lower. In vivo blocking study suggested that the tumor uptake of 99mTc-PEG6-RD-PDP2 was PD-L2 specifically mediated. 99mTc-PEG6-RD-PDP2 is a promising SPECT probe for the non-invasive imaging of tumor PD-L2 expression and
肿瘤相关的 PD-
L2 表达与 PD-1/PD-L1 阻断治疗的临床疗效相关。PD-
L2 特异性成像可以帮助选择患者进行适当的免疫治疗。在这项研究中,通过单珠一化合物组合文库方法筛选了一种 PD-
L2 靶向肽 (PDP2)。使用 PDP2 的逆反d肽(RD-PDP2) 和 P
EG 化策略,我们开发了一种新型 Tc-99m 标记的 PD-
L2 靶向肽作为
SPECT 示踪剂 ( 99m Tc-P
EG 6 -RD-PDP2)肿瘤PD-
L2表达的成像。通过标准 HYNIC/tricine/
TPPTS 标记程序, 99m Tc-P
EG 6 -RD-PDP2的放射性标记产率大于 95%。99m Tc-P
EG6 -RD-PDP2在体外和体内均表现出高 PD-
L2 结合特异性。99m Tc-P
EG 6 -RD-PDP2 的
SPECT/CT 成像显示 A549-PD-
L2 肿瘤清晰可见,而 PD-
L2 阴性