Colloid and Polymer Science

, Volume 294, Issue 10, pp 1679–1685 | Cite as

PEGylated liposomes prepared with polyborane instead of cholesterol for BNCT: characteristics and biodistribution evaluation

  • Issei Takeuchi
  • Keishiro Tomoda
  • Koji Matsumoto
  • Hiromi Uchiro
  • Kimiko Makino
Original Contribution


Recently, boron neutron capture therapy (BNCT) has been focused on, which is a cancer therapy using nuclear reaction between boron and thermal neutron. To selectively destroy cancer cells, the high accumulation and selective delivery of boron-10 (10B) into tumor tissue are required. We have developed polyborane from 1,7-dicarba-closo-dodecaborane as a boron carrier. To evaluate tumor accumulation of polyborane, PEGylated liposomes were chosen as carrier. The mean volume diameters of polyborane-embedded liposomes were 50, 100, and 200 nm, respectively. They were injected into the tail vein of tumor-bearing mice. Twenty-four hours later, mice were killed and biodistribution of boron was determined using the inductively coupled plasma atomic emission spectrometry. At 24 h after injection, 50 nm bare liposome and 100 nm PEGylated liposome were found in tumor with high boron levels. Moreover, 50 nm bare liposome showed high tumor/blood ratios of boron concentration, and their usability for BNCT was suggested.


Boron neutron capture therapy PEGylation Liposomes Drug delivery Dicarba-closo-dodecaborane Biodistribution 



This work was supported by Program for Development of Strategic Research Center in Private Universities supported by MEXT (2010–2014).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Issei Takeuchi
    • 1
    • 2
    • 3
  • Keishiro Tomoda
    • 1
    • 2
    • 3
  • Koji Matsumoto
    • 1
  • Hiromi Uchiro
    • 1
    • 2
    • 3
  • Kimiko Makino
    • 1
    • 2
    • 3
  1. 1.Faculty of Pharmaceutical SciencesTokyo University of ScienceChibaJapan
  2. 2.Center for Drug Delivery ResearchTokyo University of ScienceChibaJapan
  3. 3.Center for Physical PharmaceuticsTokyo University of ScienceChibaJapan

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