[99mTc(CO)3]+-(HE)3-ZIGF1R:4551,一种用于可视化恶性肿瘤中胰岛素样生长因子-1 受体表达的新型 Affibody 缀合物。

[99mTc(CO)3]+-(HE)3-ZIGF1R:4551, a new Affibody conjugate for visualization of insulin-like growth factor-1 receptor expression in malignant tumours.

机构信息

Preclinical PET Platform, Department of Medicinal Chemistry, Uppsala University, Uppsala, Sweden.

出版信息

Eur J Nucl Med Mol Imaging. 2013 Feb;40(3):439-49. doi: 10.1007/s00259-012-2284-8. Epub 2012 Nov 21.

Abstract

PURPOSE

Radionuclide imaging of insulin-like growth factor type 1 receptor (IGF-1R) expression in tumours might be used for selection of patients who would benefit from IGF-1R-targeted therapy. We have previously shown the feasibility of IGF-1R imaging using the Affibody molecule (111)In-DOTA-His(6)-Z(IGF1R:4551). The use of (99m)Tc instead of (111)In should improve sensitivity and resolution of imaging, and reduce the dose burden to patients. We hypothesized that inclusion of a HEHEHE tag instead of a His(6) tag in Z(IGF1R:4551) would permit its convenient purification using IMAC, enable labelling with (99m)Tc(CO)(3), and improve its biodistribution.

METHODS

Z(IGF1R:4551) was expressed with a HEHEHE tag in the N terminus. The resulting (HE)(3)-Z(IGF1R:4551) construct was labelled with (99m)Tc(CO)(3). Targeting of IGF-1R-expressing cells using (99m)Tc(CO)(3)-(HE)(3)-Z(IGF1R:4551) was evaluated in vitro and in vivo.

RESULTS

(HE)(3)-Z(IGF1R:4551) was stably labelled with (99m)Tc with preserved specific binding to IGF-1R-expressing DU-145 prostate cancer cells in vitro. In mice, (99m)Tc(CO)(3)-(HE)(3)-Z(IGF1R:4551) accumulated in IGF-1R-expressing organs (pancreas, stomach, lung and salivary gland). (99m)Tc(CO)(3)-(HE)(3)-Z(IGF1R:4551) demonstrated 3.6-fold lower accumulation in the liver and spleen than (111)In-DOTA-Z(IGF1R:4551). In NMRI nu/nu mice with DU-145 prostate cancer xenografts, the tumour uptake was 1.32 ± 0.11 %ID/g and the tumour-to-blood ratio was 4.4 ± 0.3 at 8 h after injection. The xenografts were visualized using a gamma camera 6 h after injection.

CONCLUSION

(99m)Tc(CO)(3)](+)-(HE)(3)-Z(IGF1R:4551) is a promising candidate for visualization of IGF-1R expression in malignant tumours.

摘要

目的

放射性核素成像胰岛素样生长因子 1 型受体(IGF-1R)在肿瘤中的表达,可用于选择受益于 IGF-1R 靶向治疗的患者。我们之前已经证明了使用 Affibody 分子(111)In-DOTA-His(6)-Z(IGF1R:4551)进行 IGF-1R 成像的可行性。使用(99m)Tc 代替(111)In 应该可以提高成像的灵敏度和分辨率,并减少患者的剂量负担。我们假设在 Z(IGF1R:4551)中加入 HEHEHE 标签而不是 His(6)标签,可以方便地使用 IMAC 进行纯化,使其能够用 [(99m)Tc(CO)(3)](+)进行标记,并改善其生物分布。

方法

在 N 端表达带有 HEHEHE 标签的 Z(IGF1R:4551)。所得(HE)(3)-Z(IGF1R:4551)构建体用 [(99m)Tc(CO)(3)](+)标记。在体外和体内评估了用 [(99m)Tc(CO)(3)](+)-(HE)(3)-Z(IGF1R:4551)靶向 IGF-1R 表达细胞的情况。

结果

(HE)(3)-Z(IGF1R:4551)在体外稳定标记(99m)Tc,与 IGF-1R 表达的 DU-145 前列腺癌细胞具有特异性结合。在小鼠中,[(99m)Tc(CO)(3)](+)-(HE)(3)-Z(IGF1R:4551)在 IGF-1R 表达的器官(胰腺、胃、肺和唾液腺)中积聚。与(111)In-DOTA-Z(IGF1R:4551)相比,(HE)(3)-Z(IGF1R:4551)在肝脏和脾脏中的积累低 3.6 倍。在具有 DU-145 前列腺癌异种移植的 NMRI nu/nu 小鼠中,肿瘤摄取率为 1.32±0.11 %ID/g,注射后 8 小时肿瘤与血液的比值为 4.4±0.3。注射后 6 小时使用伽马相机对异种移植进行可视化。

结论

(99m)Tc(CO)(3)](+)-(HE)(3)-Z(IGF1R:4551)是可视化恶性肿瘤 IGF-1R 表达的有前途的候选物。

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