Dataset Information

Bismuth-213 for Targeted Radionuclide Therapy: From Atom to Bedside.

ABSTRACT: In contrast to external high energy photon or proton therapy, targeted radionuclide therapy (TRNT) is a systemic cancer treatment allowing targeted irradiation of a primary tumor and all its metastases, resulting in less collateral damage to normal tissues. The α-emitting radionuclide bismuth-213 (²¹³Bi) has interesting properties and can be considered as a magic bullet for TRNT. The benefits and drawbacks of targeted alpha therapy with ²¹³Bi are discussed in this review, covering the entire chain from radionuclide production to bedside. First, the radionuclide properties and production of ²²⁵Ac and its daughter ²¹³Bi are discussed, followed by the fundamental chemical properties of bismuth. Next, an overview of available acyclic and macrocyclic bifunctional chelators for bismuth and general considerations for designing a ²¹³Bi-radiopharmaceutical are provided. Finally, we provide an overview of preclinical and clinical studies involving ²¹³Bi-radiopharmaceuticals, as well as the future perspectives of this promising cancer treatment option.

SUBMITTER: Ahenkorah S

PROVIDER: S-EPMC8143329 | biostudies-literature | 2021 Apr

REPOSITORIES: biostudies-literature

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Bismuth-213 for Targeted Radionuclide Therapy: From Atom to Bedside.

Ahenkorah Stephen S Cassells Irwin I Deroose Christophe M CM Cardinaels Thomas T Burgoyne Andrew R AR Bormans Guy G Ooms Maarten M Cleeren Frederik F

Pharmaceutics 20210421 5

In contrast to external high energy photon or proton therapy, targeted radionuclide therapy (TRNT) is a systemic cancer treatment allowing targeted irradiation of a primary tumor and all its metastases, resulting in less collateral damage to normal tissues. The α-emitting radionuclide bismuth-213 (<sup>213</sup>Bi) has interesting properties and can be considered as a magic bullet for TRNT. The benefits and drawbacks of targeted alpha therapy with <sup>213</sup>Bi are discussed in this review, c ...[more]

PMID: 33919391

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Project description:RIT has become an attractive strategy in cancer treatment, but still faces important drawbacks due to poor tumor penetration and undesirable pharmacokinetics of the targeting vehicles. Smaller radiolabeled antibody fragments and peptides feature highly specific target accumulation, resulting in low accumulation in healthy tissue, except for the kidneys. Nanobodies are the smallest (MW<15 kDa) functional antigen-binding fragments that are derived from heavy chain-only camelid antibodies. Here, we show that the extend of kidney retention of nanobodies is predominantly dictated by the number of polar residues in the C-terminal amino acid tag. Three nanobodies were produced with different C-terminal amino-acid tag sequences (Myc-His-tagged, His-tagged, and untagged). Dynamic planar imaging of Wistar rats with 111In-DTPA-nanobodies revealed that untagged nanobodies showed a 70% drop in kidney accumulation compared to Myc-His-tagged nanobodies at 50 min p.i.. In addition, coinfusion of untagged nanobodies with the plasma expander Gelofusin led to a final reduction of 90%. Similar findings were obtained with different 177Lu-DTPA-2Rs15d nanobody constructs in HER2pos tumor xenografted mice at 1 h p.i.. Kidney accumulation decreased 88% when comparing Myc-His-tagged to untagged 2Rs15d nanobody, and 95% with a coinfusion of Gelofusin, without affecting the tumor targeting capacity. Consequently, we identified a generic method to reduce kidney retention of radiolabeled nanobodies. Dosimetry calculations of Gelofusin-coinfused, untagged 177Lu-DTPA-2Rs15d revealed a dose of 0.90 Gy/MBq that was delivered to both tumor and kidneys and extremely low doses to healthy tissues. In a comparative study, 177Lu-DTPA-Trastuzumab supplied 6 times more radiation to the tumor than untagged 177Lu-DTPA-2Rs15d, but concomitantly also a 155, 34, 80, 26 and 4180 fold higher radioactivity burden to lung, liver, spleen, bone and blood. Most importantly, nanobody-based targeted radionuclide therapy in mice bearing small estiblashed HER2pos tumors led to an almost complete blockade of tumor growth and a significant difference in event-free survival between the treated and the control groups (P<0.0001). Based on histology analyses, no evidence of renal inflammation, apoptosis or necrosis was obtained. In conclusion, these data highlight the importance of the amino acid composition of the nanobody's C-terminus, as it has a predominant effect on kidney retention. Moreover, we show successful nanobody-based targeted radionuclide therapy in a xenograft model and highlight the potential of radiolabeled nanobodies as a valuable adjuvant therapy candidate for treatment of minimal residual and metastatic disease.

Dataset Information

Bismuth-213 for Targeted Radionuclide Therapy: From Atom to Bedside.

Publications

Bismuth-213 for Targeted Radionuclide Therapy: From Atom to Bedside.

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