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Drug Distribution: Tissue Binding01:21

Drug Distribution: Tissue Binding

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Upon entering the systemic circulation, drugs can distribute into the interstitial and intracellular fluid of various tissue cells. This distribution is facilitated by the binding of drugs to different cellular components within tissues, which may lead to drug accumulation in specific areas. Drugs bound to tissue components serve as reservoirs that release free drugs back into the system, prolonging the drug's overall action. However, this accumulation can also result in local toxicity.
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针对纤维细胞激活蛋白 (FAP) 和内细胞网膜 (ER) 的新型放射性追踪剂显示出对放射性核酸治疗的前景. 这种双重向的方法显著改善了瘤的保留,并提高了放射治疗的疗效.

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科学领域:

  • 在瘤学瘤学.
  • 放射化学 放射化学是指辐射化学.
  • 分子成像学分子成像学

背景情况:

  • 放射性标记纤维细胞激活蛋白抑制剂 (FAPI) 对于放射性核素治疗至关重要,但患有有限的瘤保留.
  • 现有的增强FAPI保留的方法在临床翻译中经常面临挑战.

研究的目的:

  • 开发一种新的序列向剂,以增强瘤保留和放射治疗疗效.
  • 调查内质网膜 (ER) 向延长瘤内FAPI保留的潜力.

主要方法:

  • 通过通过PEG3-K链接器将ER-targeting部分 (PTSA) 与FAPI核心结合起来,合成一种新的序列向剂FAPI-PEG3-K-PTSA.
  • 用-177 (177Lu) 标记该化合物的放射性标记,实现了高放射性化学产量 (>95%).
  • 评估细胞与FAP和ER局部的结合,随后进行体内研究,以评估瘤吸收,保留和治疗疗效.

主要成果:

  • 在细胞测试中,FAPI-PEG3-K-PTSA证明了与FAP的特定结合和成功的ER局部化.
  • 在体内研究显示,与FAPI-46对照组相比,超过72小时的瘤吸收和保留时间是3-5倍.
  • 被标记为177Lu的化合物实现了显著的瘤抑制,突出了其治疗潜力.

结论:

  • 开发的顺序向策略通过利用FAP进行初始瘤丰富和ER介导内部化,有效地延长了瘤内保留时间.
  • 这种方法克服了快速的外流,提高了放射治疗结果,并为器官向的放射性核素治疗提供了一个有前途的新方向.
  • 这些发现强调了有机细胞向放射性核素治疗 (TRT) 对改善癌症治疗的强大转化潜力.