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Current Medicinal Chemistry


ISSN (Print): 0929-8673
ISSN (Online): 1875-533X

Research Article

Using a Hybrid Radioenhancer to Discover Tumor Cell-targeted Treatment for Osteosarcoma: An In Vitro Study

Author(s): Fu-I Tung, Li-Chin Chen, Yu-Chi Wang, Ming-Hong Chen, Pei-Wei Shueng and Tse-Ying Liu*

Volume 28 , Issue 19 , 2021

Published on: 18 November, 2020

Page: [3877 - 3889] Pages: 13

DOI: 10.2174/0929867327666201118155216


Osteosarcoma is insensitive to radiation. High-dose radiation is often used as a treatment but causes side effects in patients. Hence, it is important to develop tumor cell-- targeted radiotherapy that could improve radiotherapy efficiency on tumor cells and reduce the toxic effect on normal cells during radiation treatment. In this study, we developed an innovative method for treating osteosarcoma by using a novel radiation-enhancer (i.e., carboxymethyl-hexanoyl chitosan-coated self-assembled Au@Fe3O4 nanoparticles; CSAF NPs). CSAF NPs were employed together with 5-aminolevulinic acid (5- ALA) to achieve tumor cell-targeted radiotherapy. In this study, osteosarcoma cells (MG63) and normal cells (MC3T3-E1) were used for an in vitro investigation, in which reactive oxygen species (ROS) assay, cell viability assay, clonogenic assay, and western blot were used to confirm the treatment efficiency. The ROS assay showed that the combination of CSAF NPs and 5-ALA enhanced radiation-induced ROS production in tumor cells (MG63); however, this was not observed in normal cells (MC3T3-E1). The cell viability ratio of normal cells to tumor cells after treatment with CSAF NPs and 5-ALA reached 2.79. Moreover, the clonogenic assay showed that the radiosensitivity of MG63 cells was increased by the combination use of CSAF NPs and 5-ALA. This was supported by performing a western blot that confirmed the expression of cytochrome c (a marker of cell mitochondria damage) and caspase-3 (a marker of cell apoptosis). The results provide an essential basis for developing tumor-cell targeted radiotherapy by means of low-- dose radiation.

Keywords: Radiotherapy, low-dose radiation, carboxymethyl-hexanoyl chitosan, gold, iron oxide, 5-aminolevulinic acid.

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