使用89Zr标记的StarPEG纳米载体的PET成像揭示了前列腺癌中异质增强的透性和保留
Niranjan Meher1,2, Anil P Bidkar1, Anju Wadhwa1
1Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, California.
Molecular cancer therapeutics
|September 27, 2024
概括
伴侣PET成像替代品可以预测瘤中的纳米药物输送. 这些新的89Zr放射标记纳米载体测量了被动瘤吸收异质性,有助于个性化癌症治疗.
科学领域:
- 生物医学工程 生物医学工程
- 放射化学 放射化学是指辐射化学.
- 在瘤学瘤学.
背景情况:
- 增强的透性和保留 (EPR) 效应影响了纳米药物在癌症中的输送,但它的有效性因癌症类型而异.
- 预测EPR介导的药物输送对于优化纳米治疗策略至关重要.
- 开发成像工具来评估瘤特异性EPR对于个性化癌症治疗至关重要.
研究的目的:
- 开发和评估89Zr放射标记的纳米载体作为正子发射断层扫描 (PET) 影像替代品,以提高透性和保留 (EPR) 效果.
- 评估这些纳米载体在各种癌症模型中预测纳米药物吸收和分布的能力,包括前列腺癌外移植.
- 研究纳米载体透,瘤血管化和EPR介导吸收之间的相关性.
主要方法:
- 两种89Zr放射标记纳米载体的合成,基于带有或没有talazoparib (TLZ) 的四臂星聚乙烯糖醇 (PEG).
- 在PEG支架上加入deferoxamine B (DFB) 来使用89Zr进行放射性标记.
- 在体内使用微PET/CT成像,生物分布研究和在皮下和转移性前列腺癌异体移植和高EPR CT26细胞系中的自发射成像进行体内评估.
- 通过CD31染色进行瘤血管化的评估.
主要成果:
- 89Zr放射标记的纳米载体 ([89Zr]PEG-DFB4和[89Zr]PEG-DFB1-TLZ3) 在高EPR CT26模型和LTL-545异种移植中显示出高吸收率,在LTL-610和22Rv1模型中吸收率中等至低.
- 在高度透的CT26瘤中观察到纳米载体透,但在其他异种移植和转移模型中发生了异质的外周积累.
- 瘤血管化在CT26中是均的,但在其他异种移植中是异质的,与观察到的纳米载体分布相关.
- 两种纳米载体都显示出类似的积累和分布模式,表明它们在测量不同瘤模型中被动吸收异质性的实用性.
结论:
- 89Zr标记的星PEG纳米载体作为有效的PET成像替代品来评估瘤特定的EPR异质性.
- 这些纳米载体可以预测纳米药物输送和分布的变化,特别是在具有挑战性的模型中,如前列腺癌异种移植.
- 这些发现支持使用这种成像替代品来指导瘤学中的个性化纳米治疗策略.
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