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Title: High Yield Production and Radiochemical Isolation of Isotopically Pure Arsenic-72 and Novel Radioarsenic Labeling Strategies for the Development of Theranostic Radiopharmaceuticals

Journal Article · · Bioconjugate Chemistry
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [1];  [1]
  1. Univ. of Wisconsin School of Medicine and Public Health, Madison, WI (United States)
  2. TRACON Pharmaceuticals, Inc., San Diego, CA (United States)
  3. Univ. of Wisconsin School of Medicine and Public Health, Madison, WI (United States); Univ. of Wisconsin, Madison, WI (United States)

Radioisotopes of arsenic are of considerable interest to the field of nuclear medicine with unique nuclear and chemical properties making them well-suited for use in novel theranostic radiopharmaceuticals. However, progress must still be made in the production of isotopically pure radioarsenic and in its stable conjugation to biological targeting vectors. This work presents the production and irradiation of isotopically enriched 72Ge(m) discs in an irrigation-cooled target system allowing for the production of isotopically pure 72As with capability on the order of 10 GBq. A radiochemical separation procedure isolated the reactive trivalent radioarsenic in a small volume buffered aqueous solution, while reclaiming 72Ge target material. The direct thiol-labeling of a monoclonal antibody resulted in a conjugate exhibiting exceptionally poor in vivo stability in a mouse model. This prompted further investigations to alternative radioarsenic labeling strategies, including the labeling of the dithiol-containing chelator dihydrolipoic acid, and thiol-modified mesoporous silica nanoparticles (MSN-SH). In conclusion, radioarsenic-labeled MSN-SH showed exceptional in vivo stability toward dearsenylation.

Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0005281; SC0008384
OSTI ID:
1467565
Journal Information:
Bioconjugate Chemistry, Vol. 27, Issue 1; ISSN 1043-1802
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 30 works
Citation information provided by
Web of Science

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Cited By (7)

1,2-Benzenedithiol and Toluene-3,4-dithiol Arsenic(III) Complexes—Synthesis, Structure, Spectroscopic Characterization and Toxicological Studies journal October 2019
Chemistry and radiochemistry of As, Re and Rh isotopes relevant to radiopharmaceutical applications: high specific activity radionuclides for imaging and treatment journal January 2017
Prevention of Deficit in Neuropsychiatric Disorders through Monitoring of Arsenic and Its Derivatives as Well as Through Bioinformatics and Cheminformatics journal April 2019
PET radiometals for antibody labeling
  • Aluicio-Sarduy, Eduardo; Ellison, Paul A.; Barnhart, Todd E.
  • Journal of Labelled Compounds and Radiopharmaceuticals, Vol. 61, Issue 9 https://doi.org/10.1002/jlcr.3607
journal March 2018
Organic Arsenicals as Functional Motifs in Polymer and Biomaterials Science journal May 2018
Targeted arsenite-loaded magnetic multifunctional nanoparticles for treatment of hepatocellular carcinoma journal February 2019
Radioactive Nanomaterials for Multimodality Imaging journal March 2016