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
- Univ. of Wisconsin School of Medicine and Public Health, Madison, WI (United States); University of Wisconsin
- Univ. of Wisconsin School of Medicine and Public Health, Madison, WI (United States)
- TRACON Pharmaceuticals, Inc., San Diego, CA (United States)
- 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, Journal Name: Bioconjugate Chemistry Journal Issue: 1 Vol. 27; ISSN 1043-1802
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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