EGFR-Targeted ImmunoPET of UMUC3 Orthotopic Bladder Tumors.

EGFR-Targeted ImmunoPET of UMUC3 Orthotopic Bladder Tumors.
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DOI:
10.1007/s11307-022-01708-2
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发表时间:
2022-08
影响因子:
3.1
通讯作者:
--
中科院分区:
医学3区
文献类型:
--
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免疫正电子发射断层扫描 (immunoPET) 将抗体的特异性与 PET 的敏感性相结合,对癌症中失调的通路进行成像。本研究使用放射免疫缀合物 [89Zr]Zr-DFO-帕尼单抗检测免疫 PET 的性能,以检测膀胱癌 (BCa) 原位模型中的表皮生长因子受体 (EGFR) 表达。 EGFR 受体的表达和定量在四种不同的 BCa 细胞系中得到证实。结合测定验证了 [89Zr]Zr-DFO-帕尼单抗对表达 EGFR 的 UMUC3 BCa 细胞的特异性。然后使用皮下和原位 UMUC3 异种移植物进行 PET 成像和放射免疫缀合物的离体生物分布。对照组包括非肿瘤小鼠、89Zr 标记的非特异性 IgG 和阻断实验。 [89Zr]Zr-DFO-Panitumumab 与表达 EGFR 的 UMUC3 细胞特异性结合,体外 Bmax 值为 5.9 × 104 个 EGFR/细胞。免疫 PET/CT 图像显示抗体在皮下 UMUC3 异种移植物和小鼠膀胱肿瘤中的定位。在原位模型中,免疫PET信号与各自的肿瘤体积相关。离体生物分布分析进一步证实了成像结果。临床前数据提供了利用 EGFR 靶向免疫 PET 对 EGFR 蛋白水平改变的 BCa 进行成像的概念证明。
Immuno Positron Emission Tomography (immunoPET) combines the specificity of an antibody with the sensitivity of PET to image dysregulated pathways in cancer. This study examines the performance of immunoPET using the radioimmunoconjugate [89Zr]Zr-DFO-Panitumumab to detect epidermal growth factor receptor (EGFR) expression in an orthotopic model of bladder cancer (BCa). Expression and quantification of EGFR receptors were confirmed in four different BCa cell lines. Binding assays validated [89Zr]Zr-DFO-Panitumumab specificity for EGFR-expressing UMUC3 BCa cells. Subcutaneous and orthotopic UMUC3 xenografts were then used for PET imaging and ex vivo biodistribution of the radioimmunoconjugate. Control cohorts included non-tumor mice, 89Zr-labeled nonspecific IgG, and blocking experiments. [89Zr]Zr-DFO-Panitumumab binds specifically to EGFR-expressing UMUC3 cells with a Bmax value of 5.9 × 104 EGFRs/cell in vitro. ImmunoPET/CT images show localization of the antibody in subcutaneous UMUC3 xenografts and murine bladder tumors. In the orthotopic model, the immunoPET signal correlates with the respective tumor volume. Ex vivo biodistribution analysis further confirmed imaging results. The preclinical data presents a proof of concept for utilizing EGFR-targeted immunoPET to image BCa with altered EGFR protein levels.
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