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Synthesis and preliminary evaluation of 211At-labeled inhibitors of prostate-specific membrane antigen for targeted alpha particle therapy of prostate cancer.

Publication ,  Journal Article
Vaidyanathan, G; Mease, RC; Minn, I; Choi, J; Chen, Y; Shallal, H; Kang, CM; McDougald, D; Kumar, V; Pomper, MG; Zalutsky, MR
Published in: Nucl Med Biol
2021

INTRODUCTION: The high potency and short tissue range of α-particles are attractive features for targeted radionuclide therapy, particularly for cancers with micro-metastases. In the current study, we describe the synthesis of a series of 211At-labeled prostate-specific membrane antigen (PSMA) inhibitors and their preliminary evaluation as potential agents for metastatic prostate cancer treatment. METHODS: Four novel Glu-urea based PSMA ligands containing a trialkyl stannyl group were synthesized and labeled with 211At, and for comparative purposes, 131I, via halodestannylation reactions with N-chlorosuccinimide as the oxidant. A PSMA inhibitory assay was performed to evaluate PSMA binding of the unlabeled, iodinated compounds. A series of paired-label biodistribution experiments were performed to compare each 211At-labeled PSMA ligand to its 131I-labeled counterpart in mice bearing subcutaneous PC3 PSMA+ PIP xenografts. RESULTS: Radiochemical yields ranged from 32% to 65% for the 211At-labeled PSMA inhibitors and were consistently lower than those obtained with the corresponding 131I-labeled analogue. Good localization in PC3 PSMA+ PIP but not control xenografts was observed for all labeled molecules studied, which exhibited a variable degree of in vivo dehalogenation as reflected by thyroid and stomach activity levels. Normal tissue uptake and in vivo stability for several of the compounds was markedly improved compared with the previously evaluated compounds, [211At]DCABzL and [*I]DCIBzL. CONCLUSIONS AND IMPLICATIONS FOR PATIENT CARE: Compared with the first generation compound [211At]DCABzL, several of the novel 211At-labeled PSMA ligands exhibited markedly improved stability in vivo and higher tumor-to-normal tissue ratios. [211At]GV-620 has the most promising characteristics and warrants further evaluation as a targeted radiotherapeutic for prostate cancer.

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Published In

Nucl Med Biol

DOI

EISSN

1872-9614

Publication Date

2021

Volume

94-95

Start / End Page

67 / 80

Location

United States

Related Subject Headings

  • Tissue Distribution
  • Prostatic Neoplasms
  • Nuclear Medicine & Medical Imaging
  • Mice
  • Male
  • Ligands
  • Humans
  • Glutamate Carboxypeptidase II
  • Cell Line, Tumor
  • Astatine
 

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Vaidyanathan, G., Mease, R. C., Minn, I., Choi, J., Chen, Y., Shallal, H., … Zalutsky, M. R. (2021). Synthesis and preliminary evaluation of 211At-labeled inhibitors of prostate-specific membrane antigen for targeted alpha particle therapy of prostate cancer. Nucl Med Biol, 9495, 67–80. https://doi.org/10.1016/j.nucmedbio.2021.01.002
Vaidyanathan, Ganesan, Ronnie C. Mease, Il Minn, Jaeyeon Choi, Ying Chen, Hassan Shallal, Choong Mo Kang, et al. “Synthesis and preliminary evaluation of 211At-labeled inhibitors of prostate-specific membrane antigen for targeted alpha particle therapy of prostate cancer.Nucl Med Biol 94–95 (2021): 67–80. https://doi.org/10.1016/j.nucmedbio.2021.01.002.
Vaidyanathan, Ganesan, et al. “Synthesis and preliminary evaluation of 211At-labeled inhibitors of prostate-specific membrane antigen for targeted alpha particle therapy of prostate cancer.Nucl Med Biol, vol. 94–95, 2021, pp. 67–80. Pubmed, doi:10.1016/j.nucmedbio.2021.01.002.
Vaidyanathan G, Mease RC, Minn I, Choi J, Chen Y, Shallal H, Kang CM, McDougald D, Kumar V, Pomper MG, Zalutsky MR. Synthesis and preliminary evaluation of 211At-labeled inhibitors of prostate-specific membrane antigen for targeted alpha particle therapy of prostate cancer. Nucl Med Biol. 2021;94–95:67–80.
Journal cover image

Published In

Nucl Med Biol

DOI

EISSN

1872-9614

Publication Date

2021

Volume

94-95

Start / End Page

67 / 80

Location

United States

Related Subject Headings

  • Tissue Distribution
  • Prostatic Neoplasms
  • Nuclear Medicine & Medical Imaging
  • Mice
  • Male
  • Ligands
  • Humans
  • Glutamate Carboxypeptidase II
  • Cell Line, Tumor
  • Astatine