Quantitative encapsulation and retention of 227Th and decay daughters in core–shell lanthanum phosphate nanoparticles

Toro-González, Miguel; Dame, Ashley N.; Foster, Carmen M.; Millet, Larry J.; Woodward, Jonathan D.; Rojas, Jessica V.; Mirzadeh, Saed; Davern, Sandra M.

doi:10.1039/D0NR01172J

Quantitative encapsulation and retention of ²²⁷Th and decay daughters in core–shell lanthanum phosphate nanoparticles

Journal Article · Mon Apr 20 00:00:00 EDT 2020 · Nanoscale

DOI:https://doi.org/10.1039/D0NR01172J· OSTI ID:1617795

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Virginia Commonwealth Univ., Richmond, VA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Virginia Commonwealth Univ., Richmond, VA (United States)

Targeted alpha therapy (TAT) offers great promise for treating recalcitrant tumors and micrometastatic cancers. One drawback of TAT is the potential damage to normal tissues and organs due to the relocation of decay daughters from the treatment site. As such, the present study evaluates La(²²⁷Th)PO₄ core (C) and core +2 shells (C2S) nanoparticles (NPs) as a delivery platform of ²²⁷Th to minimize systemic distribution of decay daughters, ²²³Ra and ²¹¹Pb. In vitro retention of decay daughters within La(²²⁷Th)PO₄ C NPs was influenced by the concentration of reagents used during synthesis, in which the leakage of ²²³Ra was between 0.4 ± 0.2% and 20.3 ± 1.1% in deionized water. Deposition of two nonradioactive LaPO₄ shells onto La(²²⁷Th)PO₄ C NPs increased the retention of decay daughters to >99.75%. The toxicity of the nonradioactive LaPO₄ C and C2S NP delivery platforms was examined in a mammalian breast cancer cell line, BT-474. No significant decrease in cell viability was observed for a monolayer of BT-474 cells for NP concentrations below 233.9 μg mL^–1, however cell viability decreased below 60% when BT-474 spheroids were incubated with either LaPO₄ C or C2S NPs at concentrations exceeding 29.2 μg mL^–1. La(²²⁷Th)PO₄ C2S NPs exhibit a high encapsulation and in vitro retention of radionuclides with limited contribution to cellular cytotoxicity for TAT applications.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1617795

Alternate ID(s):: OSTI ID: 1615862

Journal Information:: Nanoscale, Journal Name: Nanoscale Journal Issue: 17 Vol. 12; ISSN NANOHL; ISSN 2040-3364

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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