1. Dual Targeting of Integrin α v β 3 and Neuropilin-1 Receptors Improves Micropositron Emission Tomography Imaging of Breast Cancer.
- Author
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Yao L, Li Y, Chen H, Wen X, Pang Y, Chen Z, Guo Z, Zhang X, Wu H, and Guo W
- Subjects
- Cell Line, Tumor, Female, Gallium Radioisotopes, Humans, Neuropilin-1 metabolism, Oligopeptides metabolism, Positron-Emission Tomography methods, Tissue Distribution, Breast Neoplasms pathology, Integrin alphaVbeta3 metabolism
- Abstract
The receptors neuropilin-1 (NRP-1) and integrin α
v β3 are overexpressed in breast cancer and associated with neovascularization. We synthesized a heterodimeric tracer,68 Ga-DOTA-RGD-ATWLPPR, which simultaneously targets integrin αv β3 and NRP-1 in breast cancer. In this study, we evaluated the diagnostic efficacy of68 Ga-DOTA-RGD-ATWLPPR during micropositron emission tomography (microPET)/X-ray computed tomography (CT) imaging and gamma counting. We evaluated the receptor-binding characteristics and tumor-targeting efficacy of the tracer in vitro and in vivo . Static microPET/CT imaging and gamma counting studies showed that68 Ga-DOTA-RGD-ATWLPPR uptake in MCF-7 tumors is higher than that of monomeric tracers.68 Ga-DOTA-RGD-ATWLPPR uptake could be blocked with excess unlabeled RGD or ATWLPPR, demonstrating the sensitivity and specificity of the tracer. We did not observe bone tracer uptake in vivo , but the data indicated that68 Ga-DOTA-RGD-ATWLPPR is metabolized in the kidneys and the liver uptake is low. In conclusion,68 Ga-DOTA-RGD-ATWLPPR has improved binding affinity, targeting efficiency, and tumor retention time when compared to monomeric tracers, suggesting that it has potential as an imaging probe for breast cancer detection.- Published
- 2022
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