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Viswanath D, Shin SH, Yoo J, Torregrosa-Allen SE, Harper HA, Cervantes HE, Elzey BD, Won YY. Radiation-induced photodynamic therapy using calcium tungstate nanoparticles and 5-aminolevulinic acid prodrug. Biomater Sci 2023; 11:6311-6324. [PMID: 37552121 DOI: 10.1039/d3bm00921a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/09/2023]
Abstract
Photodynamic therapy (PDT) using 5-aminolevulinic acid (ALA) prodrug is a clinically tried and proven treatment modality for surface-level lesions. However, its use for deep-seated tumors has been limited due to the poor penetration depth of visible light needed to activate the photosensitizer protoporphyrin IX (PPIX), which is produced from ALA metabolism. Herein, we report the usage of poly(ethylene glycol-b-lactic acid) (PEG-PLA)-encapsulated calcium tungstate (CaWO4, CWO for short) nanoparticles (PEG-PLA/CWO NPs) as energy transducers for X-ray-activated PDT using ALA. Owing to the spectral overlap between radioluminescence afforded by the CWO core and the absorbance of PPIX, these NPs can serve as an in situ visible light activation source during radiotherapy (RT), thereby mitigating the limitation of penetration depth. We demonstrate that this effect is observed across different cell lines with varying radio-sensitivity. Importantly, both PPIX and PEG-PLA/CWO NPs exhibit no significant toxicities at therapeutic doses in the absence of radiation. To assess the efficacy of this approach, we conducted a study using a syngeneic mouse model subcutaneously implanted with inherently radio-resistant 4T1 tumors. The results show a significantly improved prognosis compared to conventional RT, even with as few as 2 fractions of 4 Gy X-rays. Taken together, these results suggest that PEG-PLA/CWO NPs are promising agents for application of ALA-PDT in deep-seated tumors, thereby significantly expanding the utility of the already established treatment strategy.
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Affiliation(s)
- Dhushyanth Viswanath
- Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
| | - Sung-Ho Shin
- Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
| | - Jin Yoo
- Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
| | - Sandra E Torregrosa-Allen
- Purdue University Institute for Cancer Research, West Lafayette, Indiana 47907, USA
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana 47907, USA
| | - Haley A Harper
- Purdue University Institute for Cancer Research, West Lafayette, Indiana 47907, USA
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana 47907, USA
| | - Heidi E Cervantes
- Purdue University Institute for Cancer Research, West Lafayette, Indiana 47907, USA
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana 47907, USA
| | - Bennett D Elzey
- Purdue University Institute for Cancer Research, West Lafayette, Indiana 47907, USA
- Department of Comparative Pathobiology, Purdue University, West Lafayette, Indiana 47907, USA
| | - You-Yeon Won
- Davidson School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
- Purdue University Institute for Cancer Research, West Lafayette, Indiana 47907, USA
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