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Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging 2/2024

11.10.2023 | Original Article

Development of probes for radiotheranostics with albumin binding moiety to increase the therapeutic effects of astatine-211 (211At)

verfasst von: Hiroaki Echigo, Kenji Mishiro, Masayuki Munekane, Takeshi Fuchigami, Kohshin Washiyama, Kazuhiro Takahashi, Yoji Kitamura, Hiroshi Wakabayashi, Seigo Kinuya, Kazuma Ogawa

Erschienen in: European Journal of Nuclear Medicine and Molecular Imaging | Ausgabe 2/2024

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Abstract

Purpose

We have developed probes for multiradionuclides radiotheranostics using RGD peptide ([67Ga]Ga-DOTA-c[RGDf(4-I)K] ([67Ga]1) and Ga-DOTA-[211At]c[RGDf(4-At)K] ([211At]2)) for clinical applications. The introduction of an albumin binding moiety (ABM), such as 4-(4-iodophenyl)-butyric acid (IPBA), that has high affinity with the blood albumin and prolongs the circulation half-life can improve the pharmacokinetics of drugs. To perform more effective targeted alpha therapy (TAT), we designed and synthesized Ga-DOTA-K([211At]APBA)-c(RGDfK) ([211At]5) with 4-(4-astatophenyl)-butyric acid (APBA), which has an astato group instead of an iodo group in IPBA. We evaluated whether APBA functions as ABM and [211At]5 is effective for TAT. In addition, we prepared 67Ga-labeled RGD peptide without ABM, [67Ga]Ga-DOTA-K-c(RGDfK) ([67Ga]3), and 125I-labeled RGD peptide with ABM, Ga-DOTA-K([125I]IPBA)-c(RGDfK) ([125I]4), to compare with [211At]5.

Methods

Biodistribution experiments of [67Ga]3 without ABM, [125I]4 and [211At]5 with ABM were conducted in normal mice and U-87 MG tumor-bearing mice. In addition, two doses of [211At]5 (370 or 925 kBq) were administered to U-87 MG tumor-bearing mice to confirm the therapeutic effects.

Results

The blood retention of [125I]4 and [211At]5 was remarkably increased compared to [67Ga]3. Also, [125I]4 and [211At]5 showed similar biodistribution and significantly greater tumor accumulation and retention compared to [67Ga]3. In addition, [211At]5 inhibited tumor growth in a dose-dependent manner.

Conclusion

The functionality of APBA as ABM like IPBA, and the usefulness of [211At]5 as the radionuclide therapy agent for TAT was revealed.
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Literatur
8.
Zurück zum Zitat Watabe T, Liu Y, Kaneda-Nakashima K, Sato T, Shirakami Y, Ooe K, et al. Comparison of the therapeutic effects of [211At]NaAt and [131I]NaI in an NIS-expressing thyroid cancer mouse model. Int J Mol Sci. 2022;23(16):9434. https://doi.org/10.3390/ijms23169434. Watabe T, Liu Y, Kaneda-Nakashima K, Sato T, Shirakami Y, Ooe K, et al. Comparison of the therapeutic effects of [211At]NaAt and [131I]NaI in an NIS-expressing thyroid cancer mouse model. Int J Mol Sci. 2022;23(16):9434. https://​doi.​org/​10.​3390/​ijms23169434.
20.
Metadaten
Titel
Development of probes for radiotheranostics with albumin binding moiety to increase the therapeutic effects of astatine-211 (211At)
verfasst von
Hiroaki Echigo
Kenji Mishiro
Masayuki Munekane
Takeshi Fuchigami
Kohshin Washiyama
Kazuhiro Takahashi
Yoji Kitamura
Hiroshi Wakabayashi
Seigo Kinuya
Kazuma Ogawa
Publikationsdatum
11.10.2023
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Nuclear Medicine and Molecular Imaging / Ausgabe 2/2024
Print ISSN: 1619-7070
Elektronische ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-023-06457-0

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