Targeted Delivery of Chemotherapeutic Agents Using Improved Radiosensitive Liquid Core Microcapsules and Assessment of Their Antitumor Effect

Satoshi Harada, Shigeru Ehara, Keizo Ishii, Hiromichi Yamazaki, Shigeo Matsuyama, Takahiro Sato, Shyoichi Oikawa, Tomihiro Kamiya, Kazuo Arakawa, Wataru Yokota, Koichiro Sera, Jyun Ito

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Purpose: Radiation-sensitive microcapsules composed of alginate and hyaluronic acid are being developed. We report the development of improved microcapsules that were prepared using calcium- and yttrium-induced polymerization. We previously reported on the combined antitumor effect of carboplatin-containing microcapsules and radiotherapy. Methods and Materials: We mixed a 0.1% (wt/vol) solution of hyaluronic acid with a 0.2% alginate solution. Carboplatin (l mg) and indocyanine green (12.5 μg) were added to this mixture, and the resultant material was used for capsule preparation. The capsules were prepared by spraying the material into a mixture containing a 4.34% CaCl2 solution supplemented with 0-0.01% yttrium. These capsules were irradiated with single doses of 0.5, 1.0, 1.5, or 2 Gy 60Co γ-rays. Immediately after irradiation, the frequency of microcapsule decomposition was determined using a microparticle-induced X-ray emission camera. The amount of core content released was estimated by particle-induced X-ray emission and colorimetric analysis with 0.25% indocyanine green. The antitumor effect of the combined therapy was determined by monitoring its effects on the diameter of an inoculated Meth A fibrosarcoma. Results: Microcapsules that had been polymerized using a 4.34% CaCl2 solution supplemented with 5.0 × 10-3% (10-3% meant or 10%-3) yttrium exhibited the maximal decomposition, and the optimal release of core content occurred after 2-Gy irradiation. The microcapsules exhibited a synergistic antitumor effect combined with 2-Gy irradiation and were associated with reduced adverse effects. Conclusion: The results of our study have shown that our liquid core microcapsules can be used in radiotherapy for targeted delivery of chemotherapeutic agents. Crown

Original languageEnglish
Pages (from-to)455-462
Number of pages8
JournalInternational Journal of Radiation Oncology Biology Physics
Issue number2
Publication statusPublished - 2009 Oct 1


  • Microparticle-induced X-ray emission
  • drug-delivery system
  • micro-PIXE
  • microcapsules
  • radiation

ASJC Scopus subject areas

  • Radiation
  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Cancer Research


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